A dust reduction facility for tunnel construction

Abstract

The present invention belongs to the technical field of tunnel construction, and specifically relates to a dust reduction facility for tunnel construction, including a vehicle frame. A dust reduction box is installed at the top of the vehicle frame. A box cover is arranged at the top of the dust reduction box, and a first air pump is arranged at the top of the box cover. The output end of the first air pump penetrates into the interior of the dust reduction box. An air vent member is arranged at the lowermost part inside the dust reduction box, and a first conduit is connected and communicated with the air inlet end of the air vent member. For the dust reduction facility for tunnel construction of the present invention, by providing a sealing cover and a jet head; during use, the sealing cover seals the upper part of the filter element, and then air flow is ejected from below through the jet head; the dust blocked on the filter element is ejected when affected by the air flow in the reverse direction. As the jet head and the sealing cover rotate synchronously, the filter element is fully dredged; there is no need to regularly disassemble and clean, and the dust reduction treatment of the tunnel does not need to be stopped during dredging, so the efficiency of tunnel dust reduction is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel construction, and specifically relates to a dust reduction facility for tunnel construction. Background Art

[0002] A tunnel is an engineering structure buried underground, using underground space to build a passage. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, mine tunnels, and military tunnels. The construction of tunnels has increased traffic convenience; during tunnel construction, dust is inevitably generated. For example, a large amount of dust is generated during operations such as drilling, blasting, and shoveling; dust is also generated when excavators, bulldozers, loaders, etc. are operating; in addition, vehicle operation, exhaust emissions, tunnel maintenance, etc. will also generate dust.

[0003] Workers in the tunnel are exposed to dust for a long time and are prone to lung diseases such as pneumoconiosis and silicosis; therefore, it is necessary to perform dust reduction treatment in the tunnel; currently, dust reduction can be achieved by sprinkling water, ventilation, using a dust removal vehicle, etc. in the tunnel; generally, for convenience, a dust removal vehicle is selected for operation; specifically, when using a dust removal vehicle for dust reduction, the air pump on the dust removal vehicle will absorb the air in the tunnel, and then filter it through a filtering structure such as a filter bag or a filter plate. In actual operation, the filtering structure is prone to blockage after being used for a period of time, so it needs to be regularly removed and cleaned, which is very inconvenient.

[0004] Therefore, the present invention provides a dust reduction facility for tunnel construction. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A dust reduction facility for tunnel construction according to the present invention includes a vehicle frame, a dust reduction box is installed at the top of the vehicle frame, a box cover is arranged at the top of the dust reduction box, a first air pump is arranged at the top of the box cover, and the output end of the first air pump penetrates into the interior of the dust reduction box; an air venting member is arranged at the bottommost part of the interior of the dust reduction box, an intake end of the air venting member is connected and communicated with a first conduit, the first conduit penetrates to the outside of the dust reduction box, and the first conduit outside the dust reduction box is externally connected to a second air pump, and the second air pump is installed at the top of the vehicle frame; an air outlet pipe of the air venting member is connected and communicated with a second conduit, and the second conduit penetrates to the outside of the dust reduction box;

[0007] A motor is provided at the lowermost part inside the dust settling box. A linkage plate is provided at the top end of the output end of the motor. One end of the linkage plate away from the motor is fixedly connected with a first air duct. The bottom end of the first air duct is communicated with and rotatably connected to an air vent member. The top end of the first air duct is communicated with a jet head, and an electromagnet is provided at the bottom end of the jet head. A filter sheet is provided inside the dust settling box and above the jet head. An annular ring is provided inside the dust settling box and above the filter sheet. A first annular groove is formed at the top end of the annular ring, and a rotating member is inserted into the first annular groove. A sealing cover is provided at the bottom end of the part of the rotating member outside the first annular groove, and a magnetic block is provided at the top end of the sealing cover.

[0008] Preferably, the air vent member includes a first sealing ring and an annular air box. An annular notch is formed at the top end of the annular air box. The first sealing ring is inserted into the annular notch, and the first air duct is communicated with the first sealing ring. Both the first duct and the second duct are communicated with the annular air box.

[0009] Preferably, an airbag is provided at the opening at the bottom end of the sealing cover.

[0010] Preferably, a receiving column is provided at the top end of the sealing cover. The top end of the receiving column penetrates above the rotating member. A receiving plate is provided at the top end of the receiving column. A buffer spring is provided between the receiving plate and the rotating member. Initially, there is a gap between the bottom end of the sealing cover and the filter sheet.

[0011] Preferably, a notch is formed at the bottom end of the part of the rotating member inside the first annular groove. A roller is rotatably connected inside the notch. When the rotating member slides in the first annular groove, the roller rolls on the inner wall of the first annular groove, and the bottom end part of the rotating member in the first annular groove does not contact the bottom end of the first annular groove.

[0012] Preferably, a water inlet pipe is provided on the side surface of the annular ring. The end of the water inlet pipe away from the annular ring penetrates outside the dust settling box. The end of the water inlet pipe outside the dust settling box points upward and is communicated with a water injection cylinder.

[0013] Preferably, a second sealing ring is inserted into the first annular groove. The second sealing ring is provided with a break for the rotating member to be embedded. The rotating member cooperates with the second sealing ring to seal the notch of the first annular groove. And the second sealing ring is rotatably connected to the inner wall of the first annular groove.

[0014] Preferably, a discharge pipe is provided on the side surface of the annular ring. One end of the discharge pipe is communicated with the first annular groove, and the other end penetrates outside the dust settling box.

[0015] Preferably, a second air duct is connected to the top end of the sealing cover. A second annular groove is formed at the bottom end of the box cover. A third sealing ring is rotatably connected inside the second annular groove. The top end of the second air duct penetrates through the third sealing ring. A third air pump is arranged at the top end of the box cover. The input end of the third air pump penetrates into the second annular groove. The output end of the third air pump is connected with a discharge pipe. The end of the discharge pipe far away from the third air pump is located outside the tunnel.

[0016] Preferably, the second air duct is made of deformable plastic.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. For the dust reduction facility for tunnel construction of the present invention, by arranging the sealing cover and the air jet head; during use, the sealing cover seals the top part of the filter sheet, and then the air jet head sprays air flow from below; the dust blocked on the filter sheet is ejected when affected by the reverse air flow, and as the air jet head and the sealing cover rotate synchronously, the filter sheet is fully dredged; there is no need to regularly disassemble and clean, and the dust reduction treatment of the tunnel does not need to be stopped during dredging, so the efficiency of tunnel dust reduction is improved.

[0019] 2. For the dust reduction facility for tunnel construction of the present invention, by arranging the air bag; during use, the air bag can be attached to the top end of the filter sheet, thereby improving the sealing effect of the sealing cover on the top end of the filter sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the drawings.

[0021] Figure 1 is a three-dimensional view of the present invention;

[0022] Figure 2 is a side view of the dust reduction box of the present invention;

[0023] Figure 3 is a schematic diagram of the internal structure of the dust reduction box of the present invention;

[0024] Figure 4 is a schematic diagram of the connection structure of the air vent component of the present invention;

[0025] Figure 5 is a schematic diagram of the air vent component of the present invention;

[0026] Figure 6 is a schematic diagram of the connection structure of the first air duct of the present invention;

[0027] Figure 7 is a schematic diagram of the connection structure of the sealing cover of the present invention;

[0028] Figure 8 is a schematic diagram of the annular ring of the present invention;

[0029] Figure 9 is a schematic diagram of a second sealing ring on the annular ring of the present invention;

[0030] Figure 10 It is a schematic diagram of the connection between the sealing cover and the rotating member of the present invention;

[0031] Figure 11 is a side schematic diagram of a rotating member of the present invention;

[0032] Figure 12 It is a schematic diagram of the bottom structure of the box cover of the present invention;

[0033] Figure 13 It is a schematic diagram of the bottom end of a case cover of the present invention.

[0034] In the figure: 1, frame; 11, dust suppression box; 12, box cover; 121, second annular groove; 122, third air pump; 123, discharge pipe; 13, first air pump; 2, ventilation piece; 200, first sealing ring; 201, annular air box; 21, first conduit; 22, second air pump; 23, second conduit; 3, motor; 31, linkage plate; 32, first air guide pipe; 33, jet head; 34, electromagnet; 4, filter; 5, annular ring; 51, first annular groove; 510, second sealing ring; 52, rotating piece; 521, roller; 53, sealing cover; 54, receiving column; 55, receiving plate; 56, buffer spring; 57, magnetic block; 58, air bag; 581, water injection cylinder; 582, water inlet pipe; 59, outlet pipe; 6, second air guide pipe; 61, third sealing ring. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0036] like Figures 1 to 8 As shown, a tunnel construction dust reduction facility according to an embodiment of the present invention comprises a frame 1, a dust reduction box 11 is installed at the top of the frame 1, and an air outlet is opened at the bottom of the dust reduction box 11; a box cover 12 is arranged at the top of the dust reduction box 11, and a first air pump 13 is arranged at the top of the box cover 12, and the output end of the first air pump 13 is connected to the inside of the dust reduction box 11; a ventilator 2 is arranged at the bottom of the dust reduction box 11, and a first conduit 21 is connected to the air inlet end of the ventilator 2, and the first conduit 21 is connected to the outside of the dust reduction box 11, and the first conduit 21 located outside the dust reduction box 11 is externally connected to a second air pump 22, and the second air pump 22 is installed at the top of the frame 1; the air outlet pipe of the ventilator 2 is connected to a second conduit 23, and the second conduit 23 is connected to the outside of the dust reduction box 11;

[0037] A motor 3 is provided at the lowermost part inside the dust settling box 11. At the top of the output end of the motor 3, there is a linkage plate 31. One end of the linkage plate 31 away from the motor 3 is fixedly connected with a first air duct 32. The bottom end of the first air duct 32 is communicated with and rotatably connected to the air vent member 2; the top end of the first air duct 32 is communicated with a jet head 33, and an electromagnet 34 is provided at the bottom end of the jet head 33; inside the dust settling box 11 and above the jet head 33, there is a filter sheet 4, and inside the dust settling box 11 and above the filter sheet 4, there is an annular ring 5. A first annular groove 51 is provided at the top end of the annular ring 5, and a rotating member 52 is inserted into the inside of the first annular groove 51. The bottom end of the part of the rotating member 52 outside the first annular groove 51 is provided with a sealing cover 53, and a magnetic block 57 is provided at the top end of the sealing cover 53;

[0038] When dust reduction treatment is carried out on a tunnel at present, dust reduction can be carried out by operations such as sprinkling water, ventilating, and using a dust removal vehicle in the tunnel; generally, in order to be convenient, a dust removal vehicle will be selected for operation; specifically, when dust reduction is carried out by a dust removal vehicle, the air pump on the dust removal vehicle will absorb the air in the tunnel, and then filter it through a filtering structure such as a filter cloth bag or a filter plate. In actual operation, the filtering structure is prone to blockage after being used for a period of time. Therefore, it needs to be regularly removed and cleaned, which is very inconvenient; to solve the above problems, the embodiment of the present invention sets up a jet head 33, a sealing cover 53 and other structures; the specific use process is as follows; when in use, the staff pushes the vehicle frame 1 into the tunnel, and then starts the first air pump 13. The first air pump 13 pumps the air in the tunnel into the dust reduction box 11, and then filters the dust through the filter sheet 4, and then discharges it through the air outlet opened at the bottom of the dust reduction box 11; in this process, dust will continuously accumulate at the top of the filter sheet 4; after being used for a period of time, the electromagnet 34 is energized, and the electromagnet 34 attracts the magnetic block 57 above. At the same time, the second air pump 22 and the motor 3 are started. The second air pump 22 injects air into the ventilation member 2 through the first conduit 21. The ventilation member 2 discharges a part of the gas through the second conduit 23, and injects the other part into the first air duct 32. Then the first air duct 32 injects the gas into the jet head 33, and then sprays it out from the jet head 33 to the bottom of the filter sheet 4; the purpose of setting the second conduit 23 is to buffer the ventilation member 2; to avoid excessive instantaneous pressure in the ventilation member 2; the airflow ejected from the jet head 33 acts on the bottom of the filter sheet 4, and the motor 3 drives the first air duct 32 to rotate through the linkage plate 31, and the first air duct 32 drives the jet head 33 to rotate; at the same time, the energized electromagnet 34 attracts the magnetic block 57, and the magnetic block 57 drives the rotating member 52 to rotate in the first annular groove 51 on the annular ring 5 through the sealing cover 53, and when the sealing cover 53 rotates, it is located directly above the jet head 33; at this time, the first air pump 13 works normally, and the sealing cover 53 blocks the output airflow of the first air pump 13, so that the part of the filter sheet 4 below the sealing cover 53 is fully affected by the airflow ejected from the jet head 33 below. Therefore, the dust blocked on the filter sheet 4 is ejected when it is affected by the reverse airflow. As the jet head 33 and the sealing cover 53 rotate synchronously, the filter sheet 4 is fully dredged; there is no need to regularly disassemble and clean, and the dust reduction treatment of the tunnel does not need to be stopped during dredging, so the efficiency of tunnel dust reduction is improved; it should be noted that the input end of the second air pump 22 is externally connected to a trachea leading to the outside of the tunnel (not shown in the attached drawings of the specification) to prevent the bottom part of the filter sheet 4 from being blocked by dust in the air.

[0039] The air venting member 2 includes a first sealing ring 200 and an annular air box 201; an annular notch is formed at the top end of the annular air box 201; the first sealing ring 200 is inserted into the annular notch, and the first air duct 32 communicates with the first sealing ring 200; both the first conduit 21 and the second conduit 23 communicate with the annular air box 201; when the first air duct 32 rotates, the first air duct 32 drives the first sealing ring 200 to rotate in the annular notch on the annular air box 201, and the second air pump 22 injects the outside air into the annular air box 201 first, and then into the first air duct 32; the second air pump 22 does not need to rotate synchronously during the entire inflation process; the second air pump 22 is protected, and the use stability is improved.

[0040] An airbag 58 is provided at the bottom opening of the sealing cover 53; during use, the airbag 58 can adhere to the top end of the filter element 4, thereby improving the sealing effect of the sealing cover 53 on the top end of the filter element 4.

[0041] As Figures 4 to 11 shown, a receiving post 54 is provided at the top end of the sealing cover 53, the top end of the receiving post 54 penetrates above the rotating member 52, a receiving plate 55 is provided at the top end of the receiving post 54, and a buffer spring 56 is provided between the receiving plate 55 and the rotating member 52. Initially, there is a gap between the bottom end of the sealing cover 53 and the filter element 4; initially, there is a gap between the bottom end of the sealing cover 53 and the filter element 4; when the electromagnet 34 is energized, the magnetic block 57 is attracted and has a downward magnetic force, so that the sealing cover 53 drives the receiving post 54 to move downward, and the receiving post 54 drives the receiving plate 55 to compress the buffer spring 56, and stops when the bottom end of the sealing cover 53 contacts the top end of the filter element 4, and then slides on the top end of the filter element 4. Finally, when the electromagnet 34 is powered off, the sealing cover 53 resets, avoiding continuous contact between the sealing cover 53 and the filter element 4, resulting in continuous friction damage to the filter element 4.

[0042] A notch is formed at the bottom end of the part of the rotating member 52 located in the first annular groove 51, and a roller 521 is rotatably connected in the notch. When the rotating member 52 slides in the first annular groove 51, the roller 521 rolls on the inner wall of the first annular groove 51, and the bottom end part of the rotating member 52 located in the first annular groove 51 does not contact the bottom end of the first annular groove 51; when the rotating member 52 rotates, the roller 521 rolls on the inner wall of the first annular groove 51; the bottom end part of the rotating member 52 located in the first annular groove 51 does not contact the bottom end of the first annular groove 51; therefore, the inner wall at the bottom of the first annular groove 51 is prevented from being continuously rubbed by the bottom end of the rotating member 52, resulting in wear of the rotating member 52 and affecting its service life.

[0043] A water inlet pipe 582 is provided on the side of the annular ring 5. The end of the water inlet pipe 582 away from the annular ring 5 penetrates outside the dust reduction box 11. The end of the water inlet pipe 582 located outside the dust reduction box 11 points upward and is connected with a water injection cylinder 581 in a communicating manner. A one-way valve is arranged inside the water injection cylinder 581. When in use, the one-way valve is opened, and the liquid water inside the water injection cylinder 581 flows into the first annular groove 51 through the water inlet pipe 582 to cool the first annular groove 51, avoiding continuous frictional heat generation of the rotating member 52 in the first annular groove 51, which may cause the annular ring 5 to overheat and deform.

[0044] A second sealing ring 510 is inserted into the inside of the first annular groove 51. The second sealing ring 510 is provided with a notch for the rotating member 52 to be embedded. The rotating member 52 cooperates with the second sealing ring 510 to seal the notch of the first annular groove 51. And the second sealing ring 510 is rotatably connected with the inner wall of the first annular groove 51. By arranging the second sealing ring 510, it can be avoided that the water vapor generated by the evaporation of the liquid water in the first annular groove 51 enters the dust reduction box 11, humidifying the dust in the dust reduction box 11 into lumps and causing the filter element 4 to be quickly blocked.

[0045] An outlet pipe 59 is provided on the side of the annular ring 5. One end of the outlet pipe 59 is communicated with the first annular groove 51, and the other end penetrates outside the dust reduction box 11. The outlet pipe 59 discharges the water vapor in the first annular groove 51 outside the dust reduction box 11 to avoid the concentration of water vapor inside the first annular groove 51.

[0046] As Figures 12 to 13 shown, a second air duct 6 is connected to the top end of the sealing cover 53. A second annular groove 121 is opened at the bottom end of the box cover 12. A third sealing ring 61 is rotatably connected inside the second annular groove 121. The top end of the second air duct 6 penetrates through the third sealing ring 61. A third air pump 122 is arranged at the top end of the box cover 12. The input end of the third air pump 122 penetrates into the second annular groove 121. The output end of the third air pump 122 is connected with a discharge pipe 123 in a communicating manner. The end of the discharge pipe 123 away from the third air pump 122 is located outside the tunnel. When the sealing cover 53 rotates, the second air duct 6 at the top end rotates synchronously, and the second air duct 6 drives the third sealing ring 61 to rotate inside the second annular groove 121. At this time, the third air pump 122 is started. The third air pump 122 evacuates the second annular groove 121 through the input end, and the second annular groove 121 evacuates the inside of the sealing cover 53 through the second air duct 6. At this time, the electromagnet 34 is controlled to be intermittently energized, and at the same time, the motor 3 is started, so that the sealing cover 53 intermittently rotates and moves downward. When the bottom end of the sealing cover 53 contacts the top end of the filter element 4, the dust accumulated on the top end of the filter element 4 is isolated, and then is discharged outside the tunnel through the third air pump 122 and the discharge pipe 123, realizing automatic unloading without the need to stop the machine.

[0047] The second air duct 6 is made of deformable plastic; when the sealing cover 53 moves, the second air duct 6 deforms synchronously; to prevent the second air duct 6 from interfering when the sealing cover 53 moves up and down.

[0048] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A dust reduction facility for tunnel construction, characterized in that: It includes a frame (1), at the top of the frame (1) is installed a dust reduction box (11), at the top of the dust reduction box (11) is provided a box cover (12), at the top of the box cover (12) is provided a first air pump (13), and the output end of the first air pump (13) penetrates into the interior of the dust reduction box (11); at the bottommost part inside the dust reduction box (11) is provided a ventilation part (2), the air inlet end of the ventilation part (2) is connected with a first conduit (21), the first conduit (21) penetrates to the outside of the dust reduction box (11), and the first conduit (21) outside the dust reduction box (11) is externally connected with a second air pump (22), and the second air pump (22) is installed at the top of the frame (1); the air outlet pipe of the ventilation part (2) is connected with a second conduit (23), and the second conduit (23) penetrates to the outside of the dust reduction box (11). At the bottommost part inside the dust reduction box (11) is provided a motor (3), at the top of the output end of the motor (3) is provided a linkage plate (31), at one end of the linkage plate (31) away from the motor (3) is fixedly connected a first air duct (32), the bottom end of the first air duct (32) is communicated with and rotatably connected to the ventilation part (2); the top end of the first air duct (32) is connected with a jet head (33), and at the bottom end of the jet head (33) is provided an electromagnet (34); inside the dust reduction box (11) and above the jet head (33) is provided a filter sheet (4), inside the dust reduction box (11) and above the filter sheet (4) is provided an annular ring (5), at the top of the annular ring (5) is opened a first annular groove (51), inside the first annular groove (51) is inserted a rotating part (52), at the bottom end of the part of the rotating part (52) outside the first annular groove (51) is provided a sealing cover (53), and at the top of the sealing cover (53) is provided a magnetic block (57).

2. The dust reduction facility for tunnel construction according to claim 1, wherein: The ventilation part (2) includes a first sealing ring (200) and an annular air box (201); at the top of the annular air box (201) is opened an annular notch; the first sealing ring (200) is inserted into the annular notch, and the first air duct (32) is communicated with the first sealing ring (200); both the first conduit (21) and the second conduit (23) are communicated with the annular air box (201).

3. The dust reduction facility for tunnel construction according to claim 1, characterized in that: At the bottom opening of the sealing cover (53) is provided an air bag (58).

4. A dust reduction facility for tunnel construction according to claim 1, characterized in that: At the top of the sealing cover (53) is provided a receiving column (54), the top end of the receiving column (54) penetrates above the rotating part (52), at the top end of the receiving column (54) is provided a receiving plate (55), and between the receiving plate (55) and the rotating part (52) is provided a buffer spring (56). Initially, there is a gap between the bottom end of the sealing cover (53) and the filter sheet (4).

5. The dust reduction facility for tunnel construction according to claim 1, characterized in that: A notch is formed at the bottom end of the part of the rotating member (52) located inside the first annular groove (51). A roller (521) is rotatably connected inside the notch. When the rotating member (52) slides in the first annular groove (51), the roller (521) rolls on the inner wall of the first annular groove (51). The bottom end part of the rotating member (52) located in the first annular groove (51) does not contact the bottom end of the first annular groove (51).

6. The dust reduction facility for tunnel construction according to claim 5, characterized in that: A water inlet pipe (582) is arranged on the side surface of the annular ring (5). The end of the water inlet pipe (582) far away from the annular ring (5) penetrates to the outside of the dust reduction box (11). The end of the water inlet pipe (582) located outside the dust reduction box (11) points upward and is communicated with a water injection cylinder (581).

7. The dust reduction facility for tunnel construction according to claim 6, wherein: A second sealing ring (510) is inserted into the inside of the first annular groove (51). A break is formed in the second sealing ring (510) for the rotating member (52) to be embedded. The rotating member (52) cooperates with the second sealing ring (510) to seal the notch of the first annular groove (51). And the second sealing ring (510) is rotatably connected with the inner wall of the first annular groove (51).

8. The dust reduction facility for tunnel construction according to claim 7, wherein: A guide pipe (59) is arranged on the side surface of the annular ring (5). One end of the guide pipe (59) is communicated with the first annular groove (51), and the other end penetrates to the outside of the dust reduction box (11).

9. The dust reduction facility for tunnel construction according to claim 2, wherein: A second air guide pipe (6) is communicated with the top end of the sealing cover (53). A second annular groove (121) is formed at the bottom end of the box cover (12). A third sealing ring (61) is rotatably connected inside the second annular groove (121). The top end of the second air guide pipe (6) penetrates through the third sealing ring (61). A third air pump (122) is arranged on the top end of the box cover (12). The input end of the third air pump (122) penetrates into the second annular groove (121). The output end of the third air pump (122) is communicated with a discharge pipe (123). The end of the discharge pipe (123) far away from the third air pump (122) is located outside the tunnel.

10. The dust reduction facility for tunnel construction according to claim 9, characterized in that: The second air guide pipe (6) is made of deformable plastic.

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