CN114033232A

CN114033232A - High-stability anti-wind signal tower pole for electronic communication

Info

Publication number: CN114033232A
Application number: CN202111430393.6A
Authority: CN
Inventors: 鲍晶晶; 麦强
Original assignee: Dongguan Polytechnic
Current assignee: Dongguan Polytechnic
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-02-11

Abstract

The invention discloses a high-stability wind-resistant signal tower pole for electronic communication, which comprises a reserved fixing piece reserved on the ground surface, wherein a pre-buried connecting piece is fixedly installed at the upper end of the reserved fixing piece through a bolt; the signal tower pole body is fixedly arranged in the middle of the upper end of the base; also includes: the two movable sleeves are vertically distributed and are sleeved in the middle of the signal tower pole body; the rotating rod is arranged in the signal tower rod body through a bearing; the movable rod is transversely arranged inside the base in a sliding manner; the rotating cylinder is sleeved and fixed on the outer side of the upper end of the rotating rod, and a moving block attached to the inside of the signal tower rod body is sleeved on the outer side of the rotating cylinder; and the bearing of the bevel gear transmission component is arranged inside the upper end of the signal tower pole body. This anti-wind type signal tower pole for electronic communication of high stability, the control panel that sets up through the multi-angle can improve the tower pole stability under the wind-force effect of different wind directions to can guarantee signal communication equipment's radiating effect.

Description

High-stability anti-wind signal tower pole for electronic communication

Technical Field

The invention relates to the technical field related to electronic communication, in particular to a high-stability wind-resistant signal tower pole for electronic communication.

Background

The signal tower pole can receive and send signal electric waves to realize the transmission of communication information in a certain area range, belongs to a signal transfer station, and is widely applied under the promotion of continuously developing economic society.

However, the existing signal tower pole for electronic communication has the following problems:

in a strong wind-resistant sail type landscape communication tower pole with the publication number of CN210105444U, a supporting movable disc is driven to vertically displace downwards through the threaded displacement of a threaded adjusting rod, the stability of the tower pole is enhanced by utilizing the extrusion acting force between the supporting movable disc and the ground, then a rotating bearing sleeve is adjusted in advance according to wind direction forecast, and a stable inclined plane support is provided for an inclined strut by utilizing the inclined support of the inclined strut, so that the wind-resistant strength of the tower pole is effectively improved. However, the tower pole is inconvenient to use and poor in stability due to the fact that manual adjustment is required to be performed in advance according to weather conditions during actual use, and meanwhile, the information communication equipment on the tower pole is generally provided with the dustproof filter screen to assist in heat dissipation, however, impurities are easily attached to the surface of the filter screen after long-term use, so that the heat dissipation effect of the information communication equipment is influenced, and the normal work of the information communication equipment is influenced.

We have proposed a wind-resistant type signal tower for electronic communication with high stability so as to solve the problems set forth above.

Disclosure of Invention

The invention aims to provide a high-stability wind-resistant signal tower pole for electronic communication, which aims to solve the problems that the existing signal tower pole for electronic communication in the market at present is inconvenient to enhance the supporting capability according to the wind direction during actual use, has poor wind resistance, and the heat dissipation effect is influenced by impurities attached to a filter screen arranged on information communication equipment on the tower pole.

In order to achieve the purpose, the invention provides the following technical scheme: a high-stability wind-resistant signal tower pole for electronic communication comprises a reserved fixing piece reserved on the ground surface, wherein an embedded connecting piece is fixedly installed at the upper end of the reserved fixing piece through a bolt, the reserved fixing piece and the embedded connecting piece are both arranged underground, and a base is installed on the upper end of the embedded connecting piece above the ground surface;

the signal tower pole body is fixedly arranged in the middle of the upper end of the base, signal communication equipment for information transmission is arranged in the middle of the upper end of the signal tower pole body, a lightning rod is arranged at the upper end of the signal tower pole body, and a filter screen capable of dissipating heat and preventing dust is arranged on the lower side of the rear part of the signal communication equipment;

also includes:

the two movable sleeves are vertically distributed and are sleeved in the middle of the signal tower rod body, the side parts of the two movable sleeves are movably connected with connecting rods through movable shafts, and the upper connecting rod and the lower connecting rod are respectively movably connected to the upper end and the lower end of the side part of the control plate through movable shafts;

the rotating rod is arranged in the signal tower rod body through a bearing;

the movable rod is transversely arranged in the base in a sliding manner, wheels which are contacted with the ground are arranged below the end part of the movable rod, and a support rod is connected between the upper part of the end part of the movable rod and the movable sleeve positioned below the end part of the movable rod through a movable shaft;

the rotating cylinder is sleeved and fixed on the outer side of the upper end of the rotating rod, and a moving block attached to the inside of the signal tower rod body is sleeved on the outer side of the rotating cylinder;

the bearing of the bevel gear transmission component is arranged inside the upper end of the signal tower rod body, the lower end of the bevel gear transmission component is connected with the rotating rod, and the front end of the bevel gear transmission component penetrates through the inside of the rotating rod and is exposed out of the front side of the rotating rod.

Preferably, the connecting rod about the angular distribution such as movable sleeve's center, and the movable sleeve's internally mounted that is located the upper end has the fixed block of laminating in signal tower pole body inside to the fixed block cover is established the outside of bull stick for under the effect of the connecting rod of angular distribution such as, show that the control panel also is the even distribution form of angle at the outside of signal tower pole body, and then can receive the not equidirectional wind-force effect in different moments, so that follow-up stability operation improves the practicality.

Preferably, the slider is installed to the inboard of fixed block, and the slider laminating is located the inside of heliciform spout to the spout is seted up in the outside of bull stick for after the fixed block slides along with the activity sleeve that is located the top, can utilize the laminating relation between slider and the spout to drive the bull stick and rotate.

Preferably, the middle part below movable mounting of movable rod has the ball that can reduce wear, and the tip of movable rod installs the piston piece of laminating in the base inside to the one end of piston piece is located the inside of cavity, and the cavity is seted up in the inside of base moreover, makes and removes the back when the movable rod atress, can enlarge the support range on the one hand, improves support stability, and on the other hand can utilize ball reducing wear, and makes the inside negative pressure that forms of cavity.

Preferably, the cavity is arranged in the base, the cavity is communicated with the sucker, and the sucker is arranged at the bottom of the base, so that the sucker is enabled to be tightly adsorbed on the ground after negative pressure is generated in the cavity, and the stability is further improved.

Preferably, the driving groove is formed in the outer side of the rotating cylinder in a V shape, the driven block is attached to the inner side of the moving block, and the driven block is fixedly mounted on the inner side of the moving block, so that after the rotating cylinder rotates along with the rotating rod, the moving block can be driven to move up and down by utilizing the cooperation effect of the driving groove and the driven block and the attachment effect of the moving block and the signal tower rod body.

Preferably, the tip of movable block is "T" shape, and the tip block cover of movable block is equipped with the cleaning plate of laminating in the filter screen outside to the block is provided with the locating pin between cleaning plate and the movable block, makes when the movable block atress reciprocates, can drive the cleaning plate and make a round trip to wash the filter screen, guarantees the filter effect of filter screen, and then guarantees signal communication equipment's heat dissipation function, and the cleaning plate is for dismantling the setting simultaneously, so that dismantle, clear up and change.

Preferably, the front end outside cover of awl tooth drive assembly is equipped with the ring post, and the ring post is fixed in the upper end outside of signal tower pole body to the copper sheet is installed to the inner wall of ring post equidistance, and the front end outside of awl tooth drive assembly is fixed with the montant moreover, and the tip of montant rotates simultaneously and installs the strike board, makes when awl tooth drive assembly along with rotating the back, can utilize the montant to drive and strike the board and carry out synchronous rotation.

Preferably, install torsion spring between montant and the board of strikeing, and the length of montant is less than copper sheet to awl tooth drive assembly's shortest distance to the biggest distance of strikeing board to awl tooth drive assembly is greater than copper sheet to awl tooth drive assembly's shortest distance, makes when strikeing the board and rotates the back, with intermittent type contact evenly distributed's copper sheet, utilizes the effect of strikeing between board and the copper sheet of strikeing to produce sound, can drive birds, avoids causing the interference to signal communication equipment, guarantees signal communication equipment's normal use.

Compared with the prior art, the invention has the beneficial effects that: this anti-wind type signal tower pole for electronic communication of high stability, the control panel that sets up through the multi-angle can improve the tower pole stability under the wind-force effect of different wind directions to can guarantee signal communication equipment's radiating effect, concrete effect is as follows:

1. the control panel and the support rod are arranged, so that the control panel with equal angular distribution can be acted by wind in different directions at different moments, the two connecting rods are used for driving the upper movable sleeve and the lower movable sleeve to move up and down respectively, when the movable sleeve below moves down, the support rod is used for driving the movable rod and the wheels to move towards the outer directions of the two sides of the tower pole, the support range of the tower pole is expanded, and meanwhile, when the movable rod moves, negative pressure is formed in the cavity, so that the suction disc can be adsorbed on the ground, the support stability is enhanced, and the wind resistance of the signal tower pole is improved;

2. be provided with bull stick and rotary drum, when making when the movable sleeve that is located the top shifts up, can utilize the cooperation of spout and slider to drive the rotary drum that the bull stick upper end was installed and rotate, utilize the cooperation of drive groove and driven piece to drive the clearance board afterwards and make a round trip to clean in the outside of filter screen, with the adnexed impurity on getting rid of the filter screen, guarantee signal communication equipment's normal heat dissipation, the bull stick will drive awl tooth drive assembly and rotate simultaneously, make the montant that awl tooth drive assembly one end was installed and strike the board and constantly strike to the copper sheet that waits angular distribution, utilize and strike produced sound and drive birds, avoid causing the use influence to signal communication equipment.

Drawings

FIG. 1 is a schematic front sectional view of the present invention;

FIG. 2 is a schematic view of a front cross-section of a rotating rod according to the present invention;

FIG. 3 is a schematic view of a top-down structure of the connecting structure of the rotating rod and the movable sleeve of the present invention;

FIG. 4 is a schematic view of a front cross-sectional view of the base of the present invention;

FIG. 5 is a schematic side sectional view of the signal communication device according to the present invention;

FIG. 6 is a schematic side sectional view of the rotary drum of the present invention;

FIG. 7 is a schematic view of a front cross-sectional structure of the circular column of the present invention;

FIG. 8 is a schematic view of the connection structure of the vertical rod and the striking plate according to the present invention.

In the figure: 1. reserving a fixing piece; 2. pre-burying a connecting piece; 3. a base; 4. a signal tower pole body; 5. a signal communication device; 6. a movable sleeve; 7. a connecting rod; 8. a control panel; 9. a fixed block; 901. a slider; 902. a chute; 10. a rotating rod; 11. a movable rod; 12. a support bar; 13. a wheel; 14. a piston block; 15. a ball bearing; 16. a cavity; 17. a suction cup; 18. a rotating drum; 1801. a drive slot; 1802. a driven block; 19. a moving block; 20. cleaning the plate; 21. positioning pins; 22. filtering with a screen; 23. a bevel gear transmission assembly; 24. a circular column; 25. a copper sheet; 26. a vertical rod; 27. knocking the plate; 28. a torsion spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, the present invention provides a technical solution: a high-stability wind-resistant signal tower pole for electronic communication comprises a reserved fixing piece 1 reserved on the ground surface, wherein an embedded connecting piece 2 is fixedly installed at the upper end of the reserved fixing piece 1 through a bolt, the reserved fixing piece 1 and the embedded connecting piece 2 are both arranged underground, and a base 3 is installed on the upper end of the embedded connecting piece 2 above the ground surface; the signal tower pole body 4 is fixedly arranged in the middle of the upper end of the base 3, the signal communication equipment 5 for information transmission is arranged in the middle of the upper end of the signal tower pole body 4, the lightning rod is arranged at the upper end of the signal tower pole body 4, and the heat-radiating and dust-proof filter screen 22 is arranged on the lower rear side of the signal communication equipment 5; also includes: the two movable sleeves 6 are vertically distributed and are sleeved in the middle of the signal tower rod body 4, the side parts of the two movable sleeves 6 are movably connected with connecting rods 7 through movable shafts, and the upper connecting rod 7 and the lower connecting rod 7 are respectively connected to the upper end and the lower end of the side part of the control plate 8 through the movable shafts; a rotating rod 10, the bearing of which is installed inside the signal tower rod body 4; the connecting rods 7 are distributed in an equal angle mode about the center of the movable sleeve 6, a fixed block 9 attached to the inside of the signal tower rod body 4 is installed inside the movable sleeve 6 at the upper end, and the fixed block 9 is sleeved on the outer side of the rotating rod 10; referring to fig. 1-3, when the signal tower pole body 4 is in use and is subjected to wind forces in different directions at different times, the control board 8 drives the upper and lower movable sleeves 6 to move up and down respectively by using the two connecting rods 7; a sliding block 901 is arranged on the inner side of the fixed block 9, the sliding block 901 is attached to the inner part of a spiral sliding groove 902, and the sliding groove 902 is arranged on the outer side of the rotating rod 10; as shown in connection with FIG. 2; when the movable sleeve 6 located above is displaced, the fixed block 9 is driven to slide outside the rotating rod 10, and the rotating rod 10 is driven to rotate by the cooperation between the spiral sliding groove 902 and the sliding block 901;

the movable rod 11 is transversely arranged in the base 3 in a sliding manner, a wheel 13 which is contacted with the ground is arranged below the end part of the movable rod 11, and a support rod 12 is connected between the upper part of the end part of the movable rod 11 and the movable sleeve 6 positioned below the movable rod through a movable shaft; a ball 15 capable of reducing abrasion is movably arranged below the middle part of the movable rod 11, a piston block 14 attached to the inside of the base 3 is arranged at the end part of the movable rod 11, one end of the piston block 14 is positioned in a cavity 16, and the cavity 16 is arranged in the base 3; the cavity 16 is arranged in the base 3, the cavity 16 is communicated with the sucker 17, and the sucker 17 is arranged at the bottom of the base 3; as shown in fig. 1 and 4, when the movable sleeve 6 located below moves downwards, the support rod 12 can be used to pull the movable rod 11 to slide from the inside of the base 3, so as to support the range, and at the same time, the movable rod 11 can drive the piston block 14 to move synchronously, so that a negative pressure is formed inside the cavity 16, and since the cavity 16 is communicated with the suction cup 17, the suction cup 17 can be adsorbed on the ground, thereby enhancing the stability and improving the wind resistance effect;

a rotating drum 18 which is fixedly sleeved on the outer side of the upper end of the rotating rod 10, and a moving block 19 which is attached to the inside of the signal tower rod body 4 is sleeved on the outer side of the rotating drum 18; a driving groove 1801 in a V shape is formed on the outer side of the rotary drum 18, a driven block 1802 is attached to the inside of the driving groove 1801, and the driven block 1802 is fixedly mounted on the inner side of the moving block 19; the end part of the moving block 19 is in a T shape, the end part of the moving block 19 is clamped and sleeved with a cleaning plate 20 attached to the outer side of the filter screen 22, and a positioning pin 21 is clamped and arranged between the cleaning plate 20 and the moving block 19; with reference to fig. 1 and fig. 5-6, after the rotating rod 10 rotates, the rotating cylinder 18 can be driven to synchronously rotate, after the rotating cylinder 18 rotates, the moving block 19 sleeved outside the rotating cylinder 18 can obtain the up-and-down moving force by using the driving groove 1801 and the driven block 1802, because the moving block 19 is attached to the inside of the signal tower rod body 4, the moving block 19 can move up and down, and further can drive the cleaning plate 20 clamped and arranged at the side part of the moving block 19 to clean the filter screen 22 up and down and back, and meanwhile, the cleaning plate 20 is detachably arranged for subsequent replacement and cleaning, the cleaned filter screen 22 can ensure the filtering effect, and further can ensure the heat dissipation effect of the signal communication device 5;

the bevel gear transmission component 23 is mounted inside the upper end of the signal tower rod body 4 through a bearing, the lower end of the bevel gear transmission component 23 is connected with the rotating rod 10, and the front end of the bevel gear transmission component 23 penetrates through the inside of the rotating rod 10 and is exposed out of the front side of the rotating rod 10; a circular ring column 24 is sleeved on the outer side of the front end of the bevel gear transmission component 23, the circular ring column 24 is fixed on the outer side of the upper end of the signal tower pole body 4, copper sheets 25 are installed on the inner wall of the circular ring column 24 at equal angles, a vertical rod 26 is fixed on the outer side of the front end of the bevel gear transmission component 23, and meanwhile a knocking plate 27 is installed at the end part of the vertical rod 26 in a rotating mode; a torsion spring 28 is arranged between the vertical rod 26 and the knocking plate 27, the length of the vertical rod 26 is smaller than the shortest distance from the copper sheet 25 to the bevel gear transmission component 23, and the maximum distance from the knocking plate 27 to the bevel gear transmission component 23 is larger than the shortest distance from the copper sheet 25 to the bevel gear transmission component 23; as shown in the combined drawings of fig. 1, 5 and 7-8, after the rotating rod 10 rotates, the bevel gear transmission assembly 23 can be driven to rotate synchronously, the vertical rod 26 can be further utilized to drive the knocking plate 27 to rotate, after the knocking plate 27 rotates, the copper sheets 25 which are intermittently and uniformly distributed can be knocked, and under the knocking action, the sent sound can drive birds, so that the interference to the work of the signal communication equipment 5 is avoided.

The working principle is as follows: when the high-stability wind-resistant signal tower pole for electronic communication is used, as shown in fig. 1-8, firstly, the pre-embedded connecting piece 2 is installed on the reserved fixing piece 1 by using the fastening bolt and then buried, when the signal tower pole body 4 is acted by wind in different wind directions at different moments, the control panel 8 drives the upper and lower movable sleeves 6 to respectively move up and down by using the two connecting rods 7, the movable sleeve 6 positioned below drives the movable rod 11 to move by using the supporting rod 12, the supporting range is expanded, the sucking disc 17 is enabled to be adsorbed on the ground, the stability is enhanced, the wind-resistant effect is improved, the movable sleeve 6 positioned above drives the rotating rod 10 to rotate, then the cleaning plate 20 is driven by the cooperation between the rotating cylinder 18 and the movable block 19 to clean the filter screen 22 back and forth, the heat dissipation effect of the signal communication equipment 5 is ensured, and the striking plate 27 is driven to strike the copper sheet 25 at the same time, drive birds, guarantee signal communication equipment 5's normal use.

Those not described in detail in this specification are prior art well known to those skilled in the art, and in the description of the present invention, "plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. A high-stability wind-resistant signal tower pole for electronic communication comprises a reserved fixing piece (1) reserved on the ground surface, wherein an embedded connecting piece (2) is fixedly mounted at the upper end of the reserved fixing piece (1) through a bolt, the reserved fixing piece (1) and the embedded connecting piece (2) are both arranged underground, and a base (3) is mounted on the ground surface at the upper end of the embedded connecting piece (2);

the signal tower pole body (4) is fixedly arranged in the middle of the upper end of the base (3), signal communication equipment (5) for information transmission is arranged in the middle of the upper end of the signal tower pole body (4), a lightning rod is arranged at the upper end of the signal tower pole body (4), and a heat-radiating and dust-proof filter screen (22) is arranged on the lower rear side of the signal communication equipment (5);

it is characterized by also comprising:

the two movable sleeves (6) are vertically distributed and are all sleeved in the middle of the signal tower rod body (4), the movable shafts on the side parts of the two movable sleeves (6) are connected with connecting rods (7), and the upper connecting rod (7) and the lower connecting rod (7) are respectively connected to the upper end and the lower end of the side part of the control plate (8) through the movable shafts;

a rotating rod (10) which is mounted inside the signal tower rod body (4) through a bearing;

the movable rod (11) is arranged in the base (3) in a transverse sliding mode, a wheel (13) which is in contact with the ground is arranged below the end part of the movable rod (11), and a support rod (12) is connected between the upper part of the end part of the movable rod (11) and the movable sleeve (6) located below the movable rod through a movable shaft;

the rotary drum (18) is sleeved and fixed on the outer side of the upper end of the rotary rod (10), and a moving block (19) attached to the inside of the signal tower rod body (4) is sleeved on the outer side of the rotary drum (18);

and the bearing of the bevel gear transmission component (23) is arranged inside the upper end of the signal tower rod body (4), the lower end of the bevel gear transmission component (23) is connected with the rotating rod (10), and the front end of the bevel gear transmission component (23) penetrates through the inside of the rotating rod (10) and is exposed out of the front side of the rotating rod (10).

2. The wind-resistant signal tower pole for electronic communication of high stability of claim 1, wherein: the connecting rod (7) is distributed in an equal angle mode about the center of the movable sleeve (6), a fixing block (9) attached to the inside of the signal tower rod body (4) is installed inside the movable sleeve (6) located at the upper end, and the fixing block (9) is sleeved on the outer side of the rotating rod (10).

3. The wind-resistant signal tower pole for electronic communication of high stability according to claim 2, wherein: the slider (901) is installed on the inner side of the fixed block (9), the slider (901) is attached to the inner portion of the spiral sliding groove (902), and the sliding groove (902) is arranged on the outer side of the rotating rod (10).

4. The wind-resistant signal tower pole for electronic communication of high stability of claim 1, wherein: the utility model discloses a portable electronic device, including base (3), movable rod (11), the middle part below movable mounting of movable rod (11) has ball (15) that can reduce wear, and the tip of movable rod (11) is installed and is laminated in inside piston block (14) of base (3) to the one end of piston block (14) is located the inside of cavity (16), and the inside of base (3) is seted up in cavity (16) moreover.

5. The wind-resistant signal tower pole for electronic communication of high stability of claim 4, wherein: the cavity (16) is arranged in the base (3), the cavity (16) is communicated with the sucker (17), and the sucker (17) is arranged at the bottom of the base (3).

6. The wind-resistant signal tower pole for electronic communication of high stability of claim 1, wherein: the outer side of the rotary drum (18) is provided with a V-shaped driving groove (1801), a driven block (1802) is attached to the inside of the driving groove (1801), and the driven block (1802) is fixedly mounted on the inner side of the moving block (19).

7. The wind-resistant signal tower pole for electronic communication of high stability of claim 1, wherein: the end part of the moving block (19) is in a T shape, the end part of the moving block (19) is clamped and sleeved with a cleaning plate (20) attached to the outer side of the filter screen (22), and a positioning pin (21) is clamped and arranged between the cleaning plate (20) and the moving block (19).

8. The wind-resistant signal tower pole for electronic communication of high stability of claim 1, wherein: the front end outside cover of awl tooth drive assembly (23) is equipped with ring post (24), and ring post (24) are fixed in the upper end outside of signal tower pole body (4) to copper sheet (25) are installed to the inner wall isogonism of ring post (24), and the front end outside of awl tooth drive assembly (23) is fixed with montant (26) moreover, and the tip of montant (26) rotates simultaneously and installs and strike board (27).

9. The wind-resistant signal tower pole for electronic communication of high stability of claim 8, wherein: a torsion spring (28) is arranged between the vertical rod (26) and the knocking plate (27), the length of the vertical rod (26) is smaller than the shortest distance from the copper sheet (25) to the bevel gear transmission assembly (23), and the maximum distance from the knocking plate (27) to the bevel gear transmission assembly (23) is larger than the shortest distance from the copper sheet (25) to the bevel gear transmission assembly (23).