Underground construction environment self-adaptive lighting device

Abstract

The invention belongs to the technical field of tunnel construction, and particularly relates to an underground construction environment self-adaptive lighting device. Comprising a frame, a base is arranged at the top end of the frame, a first connecting rod is arranged at the top end of the base, a first ball is arranged at the top end of the first connecting rod, a connecting block is arranged above the first ball, and a pair of embedding grooves are symmetrically formed in the upper end and the lower end of the connecting block; according to the self-adaptive lighting device for the underground construction environment, when the self-adaptive lighting device is used, structures such as a first connecting rod, a second connecting rod, a first ball body and a second ball body are matched through a connecting block, and specifically, the first ball body and the second ball body rotate in an embedding groove; the position of the connecting block is fixed through friction force between the first sphere and the second sphere and the inner wall of the embedding groove, so that the connecting block keeps stable when driving the lamp holder to reach a specified position; the lamp holder penetrates through the interception of the steel bar, so that the limitation of illumination is broken; and the lighting device is optimized.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, in particular to an adaptive lighting device for underground construction environment. Background Art

[0002] Tunnel construction refers to the method of designing and constructing underground projects, including tunnel construction methods, tunnel construction technology, and tunnel construction management. During the tunnel construction process, lighting is required in the tunnel to ensure the stable progress of various construction operations.

[0003] Existing tunnel lighting devices include lighting lamps, which can be installed on the inner wall of the tunnel when in use. When the tunnel is in the excavation stage and it is not convenient to install lighting lamps on the inner wall of the tunnel, workers usually use lighting carts, that is, install lighting lamps on a trolley, and carry the lighting lamps to different positions in the tunnel by the trolley to achieve lighting; however, in actual use, the light emitted by the lighting lamp on the trolley may be difficult to reach the designated area. For example, during the welding of steel bars in the initial support, the light on the trolley will be blocked by the welded steel bars, and the trolley will be blocked by the steel bars and cannot move forward; therefore, there are limitations on the lighting for steel bar welding; the lighting device needs to be further optimized.

[0004] To this end, the present invention provides an adaptive lighting device for an underground construction environment. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: the underground construction environment adaptive lighting device described in the present invention comprises a frame, a base is arranged at the top of the frame, a first connecting rod is arranged at the top of the base, a first sphere is arranged at the top of the first connecting rod, a connecting block is arranged above the first sphere, a pair of embedding grooves are symmetrically opened at the upper and lower ends of the connecting block, and the first sphere is embedded in the embedding groove at the bottom end of the connecting block; there is friction between the first sphere and the embedding groove;

[0007] A second connecting rod is arranged above the connecting block, and a pair of second spheres with the same size as the first sphere are symmetrically arranged at both ends of the second connecting rod. The second connecting rod can be installed alternately with the connecting block in conjunction with the second sphere; a positioning frame is arranged at the top of the connecting block farthest from the base after installation, a lamp holder is installed at the top of the positioning frame, a conductive wire is arranged on the side of the lamp holder, and a power supply is arranged at the bottom of the conductive wire.

[0008] Preferably, the connecting block comprises a first assembly block and a second assembly block; positioning blocks are arranged on the sides of the first assembly block and the second assembly block, and a pair of clamp blocks are sleeved on the surfaces of the positioning blocks.

[0009] Preferably, a pair of sealing rings are arranged at the upper and lower ends of the connecting block, and an annular airbag is arranged on the inner ring of the sealing ring.

[0010] Preferably, a pair of through holes communicating with the embedding grooves are symmetrically formed on both sides of the connecting block. A brake block is slidably connected inside the through hole. An arc surface adapted to the side surfaces of the first sphere and the second sphere is arranged on one side of the brake block facing the embedding groove. A rectangular nut is fixedly connected inside the through hole and on the side of the brake block away from the embedding groove. A bolt is meshed and connected inside the rectangular nut. A linkage plate is arranged at one end of the bolt outside the through hole, and a handle is arranged on the side surface of the linkage plate.

[0011] Preferably, a pair of buffer springs are arranged on one side of the linkage plate facing the through hole. A positioning column is arranged at one end of the buffer spring away from the linkage plate. A plurality of positioning grooves are formed on the side surface of the connecting block around the through hole.

[0012] Preferably, a plurality of winding cylinders are arranged at the top end of the vehicle frame and on one side of the base. A winding column is arranged inside the winding cylinder. The bottom end of the conducting wire is wound around the circumferential surface of the winding column, and the bottom end of the conducting wire penetrates outside the winding cylinder and is connected to a power source.

[0013] Preferably, a pair of limiting plates are arranged on the side surface of the connecting block. A rubber strip is arranged on one side of the pair of limiting plates facing each other, and the rubber strip is arranged at the end of the limiting plate away from the connecting block.

[0014] Preferably, a friction roller is arranged at the top end of the winding cylinder. A first motor is arranged at the end of the friction roller. A support plate is arranged between the first motor and the vehicle frame. An elastic brake plate is arranged on the side surface of the support plate. The conducting wire passes between the friction roller and the elastic brake plate. A plurality of insertion slots are annularly formed on the roller surface of the friction roller. An impact column is inserted inside the insertion slot. A contraction spring is arranged between one end of the impact column inside the insertion slot and the inner wall of the insertion slot. A pair of clamping plates are arranged on one side of the elastic brake plate facing the friction roller.

[0015] Preferably, a rubber layer is sleeved on the roller surface of the friction roller.

[0016] Preferably, a groove is formed at the top end of the winding column. A second motor is arranged inside the groove. A rotating piece is arranged at the top end of the output end of the second motor. A round hole is formed at the top end of the rotating piece. The conducting wire penetrates through the round hole.

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

[0018] 1. An adaptive lighting device for underground construction environment according to the present invention is provided with a connecting block; during use, the connecting block cooperates with structures such as the first connecting rod, the second connecting rod, the first sphere, and the second sphere. Specifically, the first sphere and the second sphere rotate in the embedding groove, and the position of the connecting block is fixedly connected through the friction force between the first sphere and the second sphere and the inner wall of the embedding groove, so that the connecting block drives the lamp head to reach a specified position and remains stable; the lamp head penetrates the interception of the steel bars, breaking the limitation of lighting; and optimizing the lighting device.

[0019] 2. An adaptive lighting device for underground construction environment according to the present invention is provided with an annular airbag; during use, the annular airbag on the sealing ring is inflated by an air pump, so that the annular airbag expands and adheres to the parts of the first sphere and the second sphere outside the embedding groove; and then cooperates with the sealing ring to seal the notch of the embedding groove, preventing dust in the tunnel from entering the embedding groove and affecting the friction effect between the embedding groove and the first sphere and the second sphere. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 is a perspective view of the present invention;

[0022] Figure 2 is a schematic diagram of the connection structure of the connecting block of the present invention;

[0023] Figure 3 is a schematic diagram of the upper structure of the connecting block of the present invention;

[0024] Figure 4 is a schematic diagram of the connection structure of the first connecting rod and the second connecting rod of the present invention;

[0025] Figure 5 is a top view schematic diagram of the limiting plate of the present invention;

[0026] Figure 6 is a schematic diagram of the sealing ring of the present invention;

[0027] Figure 7 is a combined schematic diagram of the connecting blocks of the present invention;

[0028] Figure 8 is a schematic diagram of the connection structure of the rectangular nut of the present invention;

[0029] Figure 9 is a top view schematic diagram of the connection structure of the winding and unwinding cylinder of the present invention;

[0030] Figure 10 is a schematic diagram of the internal structure of the winding and unwinding cylinder of the present invention;

[0031] Figure 11 is a schematic diagram of the connection structure of the winding column of the present invention;

[0032] Figure 12 is a schematic diagram of the impact column connection structure of the present invention;

[0033] Figure 13 is a schematic diagram of the position of the clamping plate of the present invention on the elastic brake plate.

[0034] In the figure: 1, vehicle frame; 2, base; 21, first connecting rod; 211, first sphere; 3, connecting block; 301, first combined block; 302, second combined block; 31, embedding groove; 32, positioning block; 33, clamping block; 34, sealing ring; 35, annular airbag; 36, through hole; 361, brake block; 37, rectangular nut; 371, bolt; 372, linkage plate; 373, handle; 38, buffer spring; 381, positioning column; 39, limiting plate; 391, rubber strip; 4, second connecting rod; 41, second sphere; 5, positioning frame; 51, lamp head; 52, conducting wire; 53, power supply; 6, winding and unwinding cylinder; 61, winding column; 62, second motor; 63, rotating piece; 7, support plate; 71, first motor; 72, friction roller; 721, impact column; 722, compression spring; 73, elastic brake plate; 731, clamping plate. Detailed implementation manners

[0035] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0036] As Figures 1 to 9 shown, an underground construction environment adaptive lighting device according to an embodiment of the present invention includes a vehicle frame 1. A base 2 is provided at the top end of the vehicle frame 1. A first connecting rod 21 is provided at the top end of the base 2. A first sphere 211 is provided at the top end of the first connecting rod 21. A connecting block 3 is provided above the first sphere 211. A pair of embedding grooves 31 are symmetrically opened at the upper and lower ends of the connecting block 3. The first sphere 211 is embedded into the embedding groove 31 at the bottom end of the connecting block 3; there is a frictional force between the first sphere 211 and the embedding groove 31;

[0037] A second connecting rod 4 is provided above the connecting block 3. A pair of second spheres 41 having the same size as the first sphere 211 are symmetrically provided at both ends of the second connecting rod 4. The second connecting rod 4 can be installed in an interleaved manner with the connecting block 3 in cooperation with the second spheres 41; A positioning frame 5 is provided at the top end of the connecting block 3 that is farthest from the base 2 after installation. A lamp head 51 is installed at the top end of the positioning frame 5. A conducting wire 52 is provided on the side of the lamp head 51. A power supply 53 is provided at the bottom end of the conducting wire 52;

[0038] Currently, when using a trolley to carry a lighting device for tunnel lighting, the light emitted by the lighting lamp on the trolley may be difficult to reach the designated area. For example, during the welding of steel bars in the initial support, the optical fiber on the trolley will be blocked by the welded steel bars, and the trolley will be intercepted by the steel bars and unable to move forward. Therefore, there are limitations in the lighting for steel bar welding, and the lighting device needs to be further optimized. To solve the above problems, the embodiment of the present invention provides structures such as a first connecting rod 21, a first sphere 211, a second connecting rod 4, a second sphere 41, and a connecting block 3. The specific usage process is as follows: When in use, the trolley is pushed into the tunnel. Then, the first sphere 211 at the top of the first connecting rod 21 is installed into the embedding groove 31 at the bottom of the connecting block 3, and the second sphere 41 at the end of the second connecting rod 4 is installed into the embedding groove 31 on the connecting block 3. The second connecting rod 4 and the connecting block 3 are alternately installed according to the required length and connected through the cooperation of the second sphere 41 and the embedding groove 31. Finally, the positioning frame 5 is installed on the top of the outermost connecting block 3, and the lamp head 51 on the positioning frame 5 is powered on through the power supply 53 and the conducting wire 52. After the lamp head 51 is powered on, it lights up to illuminate the tunnel. It should be noted that the above installation process can be completed in advance. When it is necessary to illuminate a position that is difficult for the trolley to reach, the staff only needs to adjust the angles between the connecting block 3, the first connecting rod 21, and the second connecting rod 4. Specifically, the first sphere 211 and the second sphere 41 rotate in the embedding groove 31, and the position of the connecting block 3 is fixed through the friction force between the first sphere 211 and the second sphere 41 and the inner wall of the embedding groove 31, so that the lamp head 51 remains stable when it reaches the designated position driven by the connecting block 3. The lamp head 51 breaks through the interception of the steel bars, breaking the limitations of lighting and optimizing the lighting device.

[0039] The connecting block 3 includes a first combined block 301 and a second combined block 302. Positioning blocks 32 are provided on the sides of the first combined block 301 and the second combined block 302. A clamping block 33 is sleeved on the surfaces of a pair of positioning blocks 32. When installing the first sphere 211 and the second sphere 41 into the interior of the embedding groove 31, the first combined block 301 and the second combined block 302 are separated from the embedding groove 31 synchronously. Then, when merging, the first sphere 211 and the second sphere 41 are covered, and the positioning blocks 32 on the first combined block 301 and the second combined block 302 are clamped and fixed through the clamping block 33. Further, the first combined block 301 and the second combined block 302 are fixed to complete the assembly. The setting of the first combined block 301 and the second combined block 302 facilitates the staff to install the first sphere 211 and the second sphere 41.

[0040] A pair of sealing rings 34 are arranged at the upper and lower ends of the connecting block 3, and an annular airbag 35 is arranged on the inner ring of the sealing ring 34; during use, the annular airbag 35 on the sealing ring 34 is inflated by an air pump, so that the annular airbag 35 expands and adheres to the part of the first sphere 211 and the second sphere 41 outside the embedding groove 31; furthermore, the sealing ring 34 is used to seal the notch of the embedding groove 31, preventing the dust in the tunnel from entering the embedding groove 31 and affecting the friction effect between the embedding groove 31 and the first sphere 211 and the second sphere 41.

[0041] A pair of through holes 36 penetrating the embedding groove 31 are symmetrically arranged on both sides of the connecting block 3. A brake block 361 is slidably connected inside the through hole 36. An arc surface adapted to the sides of the first sphere 211 and the second sphere 41 is arranged on the side of the brake block 361 facing the embedding groove 31; inside the through hole 36 and on the side of the brake block 361 away from the embedding groove 31, a rectangular nut 37 is fixedly connected. A bolt 371 is meshed and connected inside the rectangular nut 37. One end of the bolt 371 outside the through hole 36 is provided with a linkage plate 372, and a handle 373 is arranged on the side of the linkage plate 372; when the position of the lamp head 51 is adjusted, the staff twists the handle 373 to drive the bolt 371 to rotate relative to the rectangular nut 37 through the linkage plate 372, so that the end of the bolt 371 presses the brake block 361 inside the through hole 36. An arc surface adapted to the sides of the first sphere 211 and the second sphere 41 is arranged on the side of the brake block 361 facing the embedding groove 31; therefore, the brake block 361 fully adheres to the sides of the first sphere 211 and the second sphere 41; the fixing effect of the first sphere 211 and the second sphere 41 in the embedding groove 31 is improved through the friction force with the sides of the first sphere 211 and the second sphere 41; furthermore, the use stability of the lamp head 51 is improved.

[0042] A pair of buffer springs 38 are arranged on the side of the linkage plate 372 facing the through hole 36, and a positioning column 381 is arranged at one end of the buffer spring 38 away from the linkage plate 372; a plurality of positioning grooves are arranged around the through hole 36 on the side of the connecting block 3; when the bolt 371 finishes meshing and rotating relative to the rectangular nut 37, the positioning column 381 is inserted into the positioning groove, and the buffer spring 38 is used to provide an error margin for the insertion process; so that the bolt 371 maintains a stable meshing state with the rectangular nut 37; ensuring the stability of the extrusion force of the brake block 361 on the sides of the first sphere 211 and the second sphere 41.

[0043] Such as Figures 3 to 13As shown in the figure, a plurality of winding cylinders 6 are provided at the top of the frame 1 and on one side of the base 2. A winding column 61 is arranged inside the winding cylinder 6. The bottom end of the conducting wire 52 is wound around the circumferential surface of the winding column 61, and the bottom end of the conducting wire 52 penetrates outside the winding cylinder 6 and is connected to the power supply 53. During use, the conducting wire 52 is wound around the circumferential surface of the winding column 61 inside the winding cylinder 6 in sequence, which can prevent the collected conducting wires 52 from being wound and knotted with each other. When adjusting the position of the lamp head 51, it is convenient to wind and unwind the conducting wire 52.

[0044] A pair of limiting plates 39 are arranged on the side surface of the connecting block 3. A rubber strip 391 is arranged on the opposite sides of the pair of limiting plates 39. The rubber strip 391 is arranged at the end of the limiting plate 39 away from the connecting block 3. During use, the staff can embed the conducting wire 52 between the limiting plates 39, and control the position of the conducting wire 52 through the rubber strip 391, so that the conducting wire 52 adheres to the connecting block 3, preventing the conducting wire 52 from loosening and contacting the bottom surface of the tunnel, being contaminated with dirt or being crushed and damaged by the staff and vehicles in the tunnel.

[0045] A friction roller 72 is arranged at the top of the winding cylinder 6. A first motor 71 is arranged at the end of the friction roller 72. A support plate 7 is arranged between the first motor 71 and the frame 1. An elastic brake plate 73 is arranged on the side surface of the support plate 7. The conducting wire 52 passes between the friction roller 72 and the elastic brake plate 73. A plurality of insertion slots are annularly arranged on the roller surface of the friction roller 72. An impact column 721 is inserted into the inside of the insertion slot. A compression spring (722) is arranged between the end of the impact column 721 located inside the insertion slot and the inner wall of the insertion slot. A pair of clamping plates 731 are arranged on the side of the elastic brake plate 73 facing the friction roller 72. When the position of the lamp head 51 is adjusted, the first motor 71 is started. The first motor 71 drives the friction roller 72 to rotate. The friction roller 72 cooperates with the elastic brake plate 73 to drive the conducting wire 52, so that the conducting wire 52 outside the winding cylinder 6 is pulled and tightened, and further cooperates with the limiting plate 39 to prevent the conducting wire 52 from loosening, reducing the probability that the conducting wire 52 is contacted and pulled by other machines in the tunnel; further protecting the conducting wire 52. In addition, when the friction roller 72 rotates, the impact column 721 in the insertion slot is thrown out under the action of centrifugal force, and the compression spring 722 pulls the impact column 721. As the friction roller 72 rotates, the impact column 721 will intermittently impact the side surface of the elastic brake plate 73, causing the elastic brake plate 73 to vibrate, and then driving the conducting wire 52 to vibrate synchronously. The lamp head 51 connected to the conducting wire 52 vibrates synchronously. Therefore, the dust falling on the lamp head 51 falls off through vibration, improving the cleanliness of the lamp head 51 and the use effect of the lamp head 51. And the clamping plates 731 arranged on the side surface of the elastic brake plate 73 limit the position of the conducting wire 52, that is, the conducting wire 52 passes between the pair of clamping plates 731, preventing the conducting wire 52 from detaching from the elastic brake plate 73 during vibration.

[0046] A rubber layer is sleeved on the roller surface of the friction roller 72; by setting the rubber layer, the conductive wire 52 in contact with the friction roller 72 can be protected to prevent the friction roller 72 from continuously rubbing against the conductive wire 52 and scratching the conductive wire 52.

[0047] A groove is formed at the top of the winding column 61; a second motor 62 is arranged in the groove, a rotating piece 63 is arranged at the top end of the output end of the second motor 62, and a round hole is formed at the top end of the rotating piece 63; the conductive wire 52 penetrates through the round hole; when the conductive wire 52 is collected into the winding and unwinding cylinder 6, the second motor 62 is started, the second motor 62 drives the rotating piece 63 to rotate, and the rotating piece 63 rotates the conductive wire 52 through the round hole, so that the conductive wire 52 entering the winding and unwinding cylinder 6 is wound around the circumferential surface of the winding column 61; similarly, when releasing the conductive wire 52 in the winding and unwinding cylinder 6, only need to control the second motor 62 to rotate in the reverse direction; it is convenient for the staff to wind and unwind the conductive wire 52.

[0048] The above shows and describes 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 only illustrates 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 all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An adaptive lighting device for underground construction environment, characterized in that: The vehicle comprises a frame (1), a base (2) is arranged at the top of the frame (1), a first connecting rod (21) is arranged at the top of the base (2), a first sphere (211) is arranged at the top of the first connecting rod (21), a connecting block (3) is arranged above the first sphere (211), a pair of embedding grooves (31) are symmetrically provided at the upper and lower ends of the connecting block (3), and the first sphere (211) is embedded in the embedding groove (31) at the bottom end of the connecting block (3); and there is friction between the first sphere (211) and the embedding groove (31); A second connecting rod (4) is arranged above the connecting block (3); a pair of second spheres (41) having the same size as the first sphere (211) are symmetrically arranged at both ends of the second connecting rod (4); the second connecting rod (4) cooperates with the second spheres (41) to be staggeredly installed with the connecting block (3); a positioning frame (5) is arranged at the top of the connecting block (3) farthest from the base (2) after installation; a lamp holder (51) is installed at the top of the positioning frame (5); a conductive wire (52) is arranged on the side of the lamp holder (51); and a power source (53) is arranged at the bottom of the conductive wire (52).

2. The adaptive lighting device for underground construction environment according to claim 1, characterized in that: The connecting block (3) comprises a first assembly block (301) and a second assembly block (302); positioning blocks (32) are arranged on the sides of the first assembly block (301) and the second assembly block (302), and a pair of clamp blocks (33) are sleeved on the surfaces of the positioning blocks (32).

3. The adaptive lighting device for underground construction environment according to claim 1, characterized in that: A pair of sealing rings (34) are provided at the upper and lower ends of the connection block (3), and an annular air bag (35) is provided inside the sealing ring (34).

4. The adaptive lighting device for underground construction environment according to claim 1, characterized in that: A pair of through holes (36) penetrating the embedding groove (31) are symmetrically provided on both sides of the connection block (3); a brake block (361) is slidably connected inside the through hole (36); a side of the brake block (361) facing the embedding groove (31) is provided with an arc surface adapted to the side surfaces of the first sphere (211) and the second sphere (41); a rectangular nut (37) is fixedly connected inside the through hole (36) and on the side of the brake block (361) away from the embedding groove (31); a bolt (371) is meshedly connected inside the rectangular nut (37); a linkage plate (372) is provided at one end of the bolt (371) outside the through hole (36); a handle (373) is provided on the side of the linkage plate (372).

5. The adaptive lighting device for underground construction environment according to claim 4, characterized in that: A pair of buffer springs (38) are arranged on the side of the linkage plate (372) facing the through hole (36), and a positioning column (381) is arranged on the end of the buffer spring (38) away from the linkage plate (372); and a plurality of positioning grooves are arranged on the side of the connection block (3) around the through hole (36).

6. The adaptive lighting device for underground construction environment according to claim 1, characterized in that: A plurality of retractable cylinders (6) are arranged at the top of the frame (1) and on one side of the base (2), a retractable column (61) is arranged inside the retractable cylinder (6), the bottom end of the conductive wire (52) is wound around the annular circumference of the retractable column (61), and the bottom end of the conductive wire (52) passes through the outside of the retractable cylinder (6) and is connected to a power source (53).

7. The adaptive lighting device for underground construction environment according to claim 6, characterized in that: A pair of limiting plates (39) are provided on the side of the connection block (3), and a rubber strip (391) is provided on the opposite side of the pair of limiting plates (39). The rubber strip (391) is provided at the end of the limiting plate (39) away from the connection block (3).

8. The underground construction environment adaptive lighting device according to claim 7, characterized in that: A friction roller (72) is arranged at the top of the retractable cylinder (6), a first motor (71) is arranged at the end of the friction roller (72), a support plate (7) is arranged between the first motor (71) and the frame (1), an elastic brake plate (73) is arranged on the side of the support plate (7), and the conductive wire (52) passes between the friction roller (72) and the elastic brake plate (73); the roller surface of the friction roller (72) is annular and has a plurality of plug-in grooves; an impact column (721) is plugged into the inside of the plug-in groove, and a contraction spring (722) is arranged between one end of the impact column (721) located inside the plug-in groove and the inner wall of the plug-in groove; a pair of clamping plates (731) are arranged on the side of the elastic brake plate (73) facing the friction roller (72).

9. The adaptive lighting device for underground construction environment according to claim 8, characterized in that: The roller surface of the friction roller (72) is sleeved with a rubber layer.

10. The underground construction environment adaptive lighting device according to claim 9, characterized in that: The top of the winding column (61) is provided with a groove; a second motor (62) is arranged in the groove; a rotating piece (63) is arranged at the top of the output end of the second motor (62); a circular hole is provided at the top of the rotating piece (63); and the conductive wire (52) passes through the circular hole.

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