An anti-dropping outdoor cable installation bridge

Abstract

The present invention discloses an anti-slip outdoor cable installation bridge and its cable, comprising a bridge body, an installation cover, a handle, a ferrule and a cable, wherein an installation cover is provided at an opening on one side of the bridge body, a handle is welded at the middle of the outer side of the installation cover, a hanger is welded at the middle of the inner side of the installation cover, a hanging bracket is horizontally provided at the lower part of the hanger, a sleeve is sleeved on the hanging bracket, a ferrule is provided at the lower part of the sleeve, a cable is clamped inside the ferrule, and springs are provided between the inner barrier block and the transverse sliding groove and between the outer barrier block and the longitudinal sliding groove. The anti-slip outdoor cable installation bridge and its cable can realize hanging and fixing the cable inside the bridge body, avoiding contact between the cable and the bridge body, and avoiding the possibility of leakage due to cable damage. At the same time, an anti-bite net is wrapped around the outer insulation layer of the cable to prevent external animals, such as rodents, from biting the cable, thereby protecting the cable.

Description

Technical Field

[0001] The invention relates to the technical field of cable bridges, in particular to an anti-dropping outdoor cable installation bridge. Background Art

[0002] The cable tray is a hollow metal frame structure for laying cables at high places, which can be used for centralized laying and protection of cables. For example, the comparative document 1, application number: CN202011008901.7, authorization announcement number: CN112242678B, is a fastening device for a glass fiber reinforced plastic cable tray cover plate, comprising a sleeve, one end of the sleeve is fixedly connected to a sealing plate 1, the sealing plate 1 is fixedly connected to a rubber pad, the rubber pad is in contact with the cable tray, a cover plate is provided on the top of the cable tray, and the sleeve is far A sealing plate 2 is fixedly connected to one end of the sealing plate 1, a movable opening is opened on one side of the sleeve, a movable block is arranged inside the sleeve near the movable opening, a fixed block is fixedly connected to the middle of the movable block, a moving block is arranged on the side of the movable block near the fixed block, a screw rod 1 is threadedly connected to one side of the movable block, one end of the screw rod 1 is connected to the sealing plate 1 through a movable mechanism 1, the other end of the screw rod 1 passes through the sealing plate 2, and a push block is arranged on the side of the sleeve away from the movable opening. It mainly solves the problem of being able to fasten the cover plate to the cable tray and install it firmly, but when it is used, there are the following problems:

[0003] 1. Since the interior of the cable tray is a hollow rectangular space, the cables are directly placed inside the cable tray, and there is a lack of corresponding structure to fix the cables. When the cable tray is opened, the cables will fall down, which is not conducive to the maintenance of the cables;

[0004] 2. At the same time, the cable is in direct contact with the cable tray. If the cable is damaged, electric shock may easily occur. Summary of the invention

[0005] The purpose of the present invention is to provide an anti-dropping outdoor cable installation bridge to solve the problem that the existing cable bridges on the market currently proposed in the above background technology have a hollow rectangular space inside, and the cables are directly passed through the cable bridge, and there is a lack of corresponding structure for fixing the cables. When the cable bridge is opened, the cables will fall down, which is not conducive to the maintenance operation of the cables. At the same time, the cables are in direct contact with the cable bridge. If the cables are damaged, it is easy to cause safety problems such as electric shock.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an anti-dropping outdoor cable installation bridge, comprising a bridge body, an installation cover, a handle, a ferrule and a cable, a mounting cover is provided at an opening on one side of the bridge body, a handle is welded on the middle part of the outer side of the mounting cover, a hanger is welded on the middle part of the inner side of the mounting cover, a hanging bracket is horizontally provided at the lower part of the hanger, a sleeve is provided on the hanging bracket, a ferrule is provided at the lower part of the sleeve, a cable is clamped inside the ferrule, the upper part of the mounting cover is connected to the second guide groove at the upper part of the bridge body, a transverse sliding groove is provided at the bottom of the bridge body close to the opening, a horizontally movable inner barrier block is provided inside the transverse sliding groove, a sliding plate is provided at the lower part of the inner barrier block, a clamping hole is penetrated through the outer end of the sliding plate, a longitudinal sliding groove is penetrated through the top of the side of the transverse sliding groove away from the inner barrier block, a longitudinally sliding outer barrier block is provided inside the longitudinal sliding groove, and springs are provided between the inner barrier block and the transverse sliding groove and between the outer barrier block and the longitudinal sliding groove.

[0007] Furthermore, a vertically arranged support frame is welded to the top of the installation cover above the bracket, a toggle frame is arranged inside the support frame, and the toggle frame is connected to the support frame through a first reset shaft.

[0008] Furthermore, the shape of the toggle frame is an "L"-shaped structure, an inner toggle plate is provided on the side of the toggle frame close to the hanger, and an outer toggle plate is provided on the side of the toggle frame away from the hanger, and the outer toggle plate and the inner toggle plate rotate around the first reset shaft.

[0009] Furthermore, an offset groove is provided at the outer end of the bracket, and a limit platform for limiting the position of the external shifting plate is provided at the upper part of the offset groove close to the side of the hanger.

[0010] Furthermore, a horizontally movable offset block is provided inside the offset groove, the lower end of the offset block is connected to the first guide groove at the bottom of the offset groove, and a spring is provided between the offset block and the offset groove.

[0011] Furthermore, support plates are integrally formed on both sides of the upper end of the offset block, a gripping block is provided between the two support plates, and the lower portion of the gripping block is connected to the inner walls of the two support plates via a second reset shaft.

[0012] Furthermore, the outer end of the gripping block is arranged in an arc shape, and the minimum distance between the gripping block and the limiting platform is smaller than the thickness of the outer shifting plate.

[0013] Furthermore, a conical air inlet is provided on the side panel of the bridge frame body away from the mounting cover, a concave wind hood is provided in the bridge frame body inside the air inlet, the upper end of the wind hood is connected to the inner top of the bridge frame body through a third reset shaft, an impact ball is provided on the side of the wind hood away from the lower part of the air inlet, the lower end of the impact ball is connected to the inner bottom of the bridge frame body through an amplitude strip, the opening diameter of the wind hood at one end of the wind hood is smaller than the opening diameter at the other end, and a drainage outlet is provided at the bottom of the bridge frame body below the wind hood.

[0014] An outdoor cable, wherein the inner side of the outer insulation layer of the cable is wrapped with an anti-bite net, the upper side of the anti-bite net is provided with openings at equal intervals, the interior of the opening is provided with anti-bite thorn pieces integrally formed with the anti-bite net, and the inner side of the anti-bite net is provided with supporting rings at equal intervals.

[0015] Furthermore, the anti-bite thorn piece has a triangular shape.

[0016] Furthermore, the anti-bite thorn sheet is a double-layer arrangement.

[0017] Furthermore, the distance between the inner barrier block and the outer barrier block is equal to the thickness of the side wall of the mounting cover, and the inner barrier block and the outer barrier block are arranged parallel to each other.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the anti-dropping outdoor cable installation bridge is provided with an installation bridge of a corresponding structure, that is, a hanger and a hanger are provided inside the installation cover on the bridge body, and a sleeve and a clamp are matched, and an insulating pad is provided inside the clamp, so that the cable can be suspended and fixed inside the bridge body, avoiding contact between the cable and the bridge body, and avoiding the possibility of leakage due to cable damage. At the same time, an anti-bite net is wrapped around the outer insulation layer of the cable, which can prevent external animals, such as rodents, from biting the cable, thereby protecting the cable;

[0019] 1. A bracket is provided on the lower bracket of the mounting cover to cooperate with the housing frame, thereby achieving the purpose of hanging the cable clamped under the housing frame. At the same time, a toggle bracket is provided above the bracket to cooperate with the offset block in the offset groove at the outer end of the bracket to limit the outer plate of the toggle bracket, thereby achieving the limit of the housing frame and realizing the stable suspension of the housing frame on the bracket;

[0020] 2. An inner blocking block is provided inside the transverse sliding groove near the opening side of the bridge body, which cooperates with the outer blocking block to fix the side wall of the installation cover. At the same time, a clamping hole is provided through the outer end of the sliding plate to cooperate with the outer blocking block inside the longitudinal sliding groove to control the extension or retraction of the outer blocking block, so as to facilitate the removal of the installation cover;

[0021] 3. The inner side of the outer insulation layer of the cable is wrapped with an anti-bite net. At the same time, a triangular anti-bite thorn piece is provided inside the opening of the anti-bite net. When an external animal bites the cable, the anti-bite thorn piece can sting the animal's mouth to prevent the animal from continuing to bite. At the same time, the anti-bite thorn piece can be set as double or multi-layer, which can increase the contact points with the animal and improve the defense effect against the animal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional structure diagram of a bridge body and an installation cover of an anti-dropping outdoor cable installation bridge of the present invention;

[0023] Figure 2 The invention discloses an anti-dropping outdoor cable installation bridge. Figure 1 A schematic diagram of the enlarged structure of point A;

[0024] Figure 3 The invention discloses an anti-dropping outdoor cable installation bridge. Figure 2 The schematic diagram of the enlarged structure of point C in the middle;

[0025] Figure 4 It is a structural schematic diagram of an open state of a toggle frame of an anti-dropping outdoor cable installation bridge of the present invention;

[0026] Figure 5 The invention discloses an anti-dropping outdoor cable installation bridge. Figure 1 A schematic diagram of the enlarged structure of point B in the middle;

[0027] Figure 6 It is a schematic structural diagram of an anti-drop-out outdoor cable installation bridge frame of the present invention, in which an outer barrier block is in a retracted state;

[0028] Figure 7 It is a front view structural schematic diagram of a bridge body and a mounting cover of an anti-dropping outdoor cable mounting bridge of the present invention;

[0029] Figure 8 This is a schematic diagram of the internal structure of a bridge body of an anti-drop-out outdoor cable installation bridge of the present invention;

[0030] Fig. 9 The invention discloses an anti-dropping outdoor cable installation bridge. Figure 8 The enlarged structural diagram of point D in the middle;

[0031] Fig.10 It is a schematic diagram of the top view of the structure of a hanging bracket and a hanging support of an anti-dropping outdoor cable installation bridge of the present invention;

[0032] Fig.11 The invention discloses an anti-dropping outdoor cable installation bridge. Fig.10 The enlarged structural diagram of point E in the middle;

[0033] Fig.12 This is a schematic diagram of the cable and anti-bite net structure of an anti-dropping outdoor cable installation bridge of the present invention;

[0034] Fig.13 The present invention is a schematic cross-sectional structure diagram of an anti-bite net of an anti-slip outdoor cable installation bridge.

[0035] In the figure: 1. bridge frame body; 2. mounting cover; 3. handle; 4. bracket; 5. bracket; 6. sleeve frame; 7. clamping sleeve; 8. cable; 9. support frame; 10. toggle frame; 11. first reset shaft; 12. outer dial plate; 13. inner dial plate; 14. offset groove; 15. limit table; 16. offset block; 17. first guide groove; 18. support plate; 19. second reset shaft; 20. gripping block; 21. transverse sliding groove; 22. inner barrier block; 23. sliding plate; 24. clamping hole; 25. longitudinal sliding groove; 26. outer barrier block; 27. second guide groove; 28. anti-bite net; 29. ​​opening; 30. anti-bite thorn piece; 31. support ring; 32. drain outlet; 33. air inlet; 34. wind cover; 35. third reset shaft; 36. impact ball; 37. amplitude bar. DETAILED DESCRIPTION

[0036] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0037] like Figure 1-13 As shown; Example

[0038] A kind of anti-dropping outdoor cable installation bridge, including a bridge body 1, a mounting cover 2 is provided at an opening on one side of the bridge body 1, a handle 3 is welded on the middle part of the outer side of the mounting cover 2, a hanger 4 is welded on the middle part of the inner side of the mounting cover 2, a hanging bracket 5 is horizontally provided at the lower part of the hanger 4, a sleeve 6 is sleeved on the hanging bracket 5, a clamping sleeve 7 is provided at the lower part of the sleeve 6, a cable 8 is clamped inside the clamping sleeve 7, the upper part of the mounting cover 2 is connected to the second guide groove 27 at the upper part of the bridge body 1, a transverse sliding groove 21 is provided at the bottom of the bridge body 1 near the opening side, a horizontally movable inner blocking block 22 is provided inside the transverse sliding groove 21, a sliding plate 23 is provided at the lower part of the inner blocking block 22, and the outer end of the sliding plate 23 A clamping hole 24 is provided through it, a longitudinal sliding groove 25 is provided through the top of the side of the transverse sliding groove 21 away from the inner blocking block 22, a longitudinal sliding groove 25 is provided inside the longitudinal sliding groove 25, springs are provided between the inner blocking block 22 and the transverse sliding groove 21 and between the outer blocking block 26 and the longitudinal sliding groove 25, the distance between the inner blocking block 22 and the outer blocking block 26 is equal to the thickness of the side wall of the mounting cover 2, the inner blocking block 22 and the outer blocking block 26 are arranged parallel to each other, through the arrangement of the inner blocking block 22 and the outer blocking block 26 and the clamping hole 24 at the outer end of the sliding plate 23, the extension and storage of the outer blocking block 26 can be controlled, and the side plate of the mounting cover 2 can be fixed. Example

[0039] The present embodiment is different from the embodiment 1 in that a vertically arranged support frame 9 is welded to the top of the mounting cover 2 above the bracket 5, a toggle frame 10 is arranged inside the support frame 9, the toggle frame 10 is connected to the support frame 9 by a first reset shaft 11, the toggle frame 10 is in an "L" shape, an inner toggle plate 13 is arranged on the side of the toggle frame 10 close to the bracket 4, an outer toggle plate 12 is arranged on the side of the toggle frame 10 away from the bracket 4, the outer toggle plate 12 and the inner toggle plate 13 take the first reset shaft 11 as the rotation center, an offset groove 14 is arranged at the outer end of the bracket 5, a limit table 15 for limiting the outer toggle plate 12 is arranged on the upper part of the offset groove 14 close to the bracket 4, a horizontally movable offset block 16 is arranged inside the offset groove 14, and the lower end of the offset block 16 is aligned with the offset groove 14 The first guide groove 17 at the bottom is connected, a spring is provided between the offset block 16 and the offset groove 14, support plates 18 are integrally formed on both sides of the upper end of the offset block 16, and a gripping block 20 is provided between the two support plates 18, and the lower part of the gripping block 20 is connected to the inner walls of the two support plates 18 through a second reset shaft 19, and the outer end of the gripping block 20 is arranged in an arc shape, and the minimum distance between the gripping block 20 and the limit platform 15 is less than the thickness of the outer dial plate 12. Through the rotatable toggle frame 10, after the sleeve frame 6 is sleeved on the bracket 5, the outer dial plate 12 and the inner dial plate 13 on the toggle frame 10 can be used to limit the sleeve frame 6, and the gripping block 20 inside the offset groove 14 at the outer end of the bracket 5 can clamp the outer dial plate 12 to fix the toggle frame 10, thereby realizing the stable suspension of the sleeve frame 6. Example

[0040] The present embodiment is different from the embodiment 1 in that a conical air inlet 33 is provided on the side panel of the bridge body 1 away from the mounting cover 2, a concave wind hood 34 is provided in the bridge body 1 inside the air inlet 33, the upper end of the wind hood 34 is connected to the top inside the bridge body 1 through a third reset shaft 35, a striking ball 36 is provided on the side of the wind hood 34 away from the lower part of the air inlet 33, the lower end of the striking ball 36 is connected to the bottom inside the bridge body 1 through an amplitude strip 37, the opening diameter of the wind hood 34 at one end of the wind hood 34 is smaller than the opening diameter at the other end, a drain outlet 32 ​​is provided at the bottom of the bridge body 1 below the wind hood 34, by providing the wind hood 34 at the air inlet 33 of the bridge body 1, the striking ball 36 can be hit during the blowing process of the wind hood 34 to make a hitting sound, so that the animals entering can be scared away, and the striking ball 36 generates a certain amplitude through the amplitude strip 37, which can further drive away the animals.

[0041] Disclosed is an outdoor cable, wherein the inner side of the outer insulation layer of the cable 8 is wrapped with an anti-bite net 28, openings 29 are equidistantly provided on the anti-bite net 28, and anti-bite thorn pieces 30 integrally formed with the anti-bite net 28 are provided inside the openings 29, and supporting rings 31 are equidistantly provided on the inner side of the anti-bite net 28, and the shape structure of the anti-bite thorn pieces 30 is a triangular structure, and the anti-bite thorn pieces 30 are double-layered. By wrapping the anti-bite net 28 on the inner side of the outer insulation layer of the cable 8, when an animal tries to bite the cable 8, the anti-bite thorn pieces 30 inside the openings 29 on the anti-bite net 28 will sting the mouth of the animal, thereby preventing the animal from continuing to bite, thereby achieving the purpose of protecting the cable 8.

[0042] Working principle: When using the anti-drop outdoor cable installation bridge, Figure 1-4 and Figure 8-11 As shown, the cable 8 is clamped by using the clamping sleeve 7 below the sleeve 6, and then the sleeve 6 is sleeved on the bracket 5 at the bottom of the hanger 4 below the installation cover 2. The sleeve 6 first contacts the inner plate 13 on the toggle frame 10, and the inner plate 13 drives the toggle frame 10 to rotate through the first reset shaft 11. After the outer plate 12 outside the toggle frame 10 enters the offset groove 14 on the bracket 5, the gripping block 20 is squeezed, and the gripping block 20 rotates through the second reset shaft 19, and drives the offset block 16 to move outward through the support plate 18. After the outer plate 12 moves to the rear side of the gripping block 20 and contacts the limit platform 15, the offset block 16 is reset under the pull of the spring, and the gripping block 20 presses the outer plate 12. At this time, the outer plate 12 and the inner plate 13 clamp the sleeve 6.

[0043] like Figure 1 and Figure 5-7As shown, the installation cover 2 is placed inside the bridge body 1, the slider at the top of the installation cover 2 enters the second guide groove 27 at the top of the bridge body 1, and the side plate at the bottom of the installation cover 2 pushes the inner blocking block 22, and the inner blocking block 22 drives the sliding plate 23 to move. When the clamping hole 24 on the sliding plate 23 moves to the longitudinal sliding groove 25, the outer blocking block 26 inside the longitudinal sliding groove 25 moves up under the push of the spring below it, and passes through the clamping hole 24 on the sliding plate 23, thereby limiting the side plate at the bottom of the installation cover 2. At this time, the installation of the installation cover 2 is completed;

[0044] like Figure 1-13 As shown, when it is necessary to remove the cable 8 inside the bridge body 1, first press the outer blocking block 26 downward to make the outer blocking block 26 completely enter the longitudinal sliding groove 25. At this time, the mounting cover 2 can be pulled outward by the handle 3. Then, the offset block 16 inside the offset groove 14 at the outer end of the hanging bracket 5 is pulled. The offset block 16 drives the gripping block 20 on its upper part to move outward by driving the support plate 18. At this time, the outer dial plate 12 on the toggle frame 10 loses the limit of the gripping block 20. The toggle frame 10 is rotated and reset under the drive of the first reset shaft 11, and the sleeve frame 6 can be removed from the hanging bracket 5.

[0045] like Figure 1 As shown, the outside wind blows into the bridge body 1 through the air inlet 33, and then blows the wind cover 34. The wind cover 34 rotates through the third reset shaft 35, hits the impact ball 36, and makes a hitting sound. At the same time, the impact ball 36 generates a certain amplitude through the amplitude bar 37, and the trajectory is as shown in Figure 1 As shown in the middle arc curve, the effect of driving away animals is achieved.

[0046] It should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or components referred to must have specific directions, be constructed and operated in specific directions, and therefore cannot be understood as limitations on the protection content of the present invention. The standard parts used in the present invention can all be purchased on the market, and special-shaped parts can all be customized according to the instructions and the drawings. The specific connection methods of each part all adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0047] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-dropping outdoor cable installation bridge, comprising a bridge body (1), an installation cover (2), a handle (3), a ferrule (7) and a cable (8), characterized in that: A mounting cover (2) is provided at an opening on one side of the bridge frame body (1), a handle (3) is welded to the middle of the outer side of the mounting cover (2), a hanger (4) is welded to the middle of the inner side of the mounting cover (2), a bracket (5) is horizontally provided at the lower part of the hanger (4), a sleeve (6) is sleeved on the bracket (5), a clamping sleeve (7) is provided at the lower part of the sleeve (6), a cable (8) is clamped inside the clamping sleeve (7), the upper part of the mounting cover (2) is connected to the second guide groove (27) at the upper part of the bridge frame body (1), and a transverse sliding groove (27) is provided at the bottom of the bridge frame body (1) near the opening side. 1), a horizontally movable inner barrier block (22) is provided inside the transverse sliding groove (21), a sliding plate (23) is provided at the lower part of the inner barrier block (22), a clamping hole (24) is penetrated through the outer end of the sliding plate (23), a longitudinal sliding groove (25) is penetrated through the top of the side of the transverse sliding groove (21) away from the inner barrier block (22), an outer barrier block (26) is provided inside the longitudinal sliding groove (25), and springs are provided between the inner barrier block (22) and the transverse sliding groove (21) and between the outer barrier block (26) and the longitudinal sliding groove (25).

2. The anti-dropping outdoor cable installation bridge according to claim 1 is characterized in that: A vertically arranged support frame (9) is welded to the top of the mounting cover (2) above the bracket (5), a toggle frame (10) is arranged inside the support frame (9), and the toggle frame (10) is connected to the support frame (9) via a first reset shaft (11).

3. The anti-dropping outdoor cable installation bridge according to claim 2 is characterized in that: The toggle frame (10) is in the shape of an "L"-shaped structure. An inner toggle plate (13) is provided on a side of the toggle frame (10) close to the hanger (4), and an outer toggle plate (12) is provided on a side of the toggle frame (10) away from the hanger (4). The outer toggle plate (12) and the inner toggle plate (13) rotate around the first reset shaft (11).

4. The anti-dropping outdoor cable installation bridge according to claim 1 is characterized in that: An offset groove (14) is provided at the outer end of the hanging bracket (5), and a limit platform (15) for limiting the position of the external shifting plate (12) is provided at the upper portion of the offset groove (14) close to the side of the hanging bracket (4).

5. The anti-dropping outdoor cable installation bridge according to claim 4 is characterized in that: A horizontally movable offset block (16) is provided inside the offset groove (14); the lower end of the offset block (16) is connected to a first guide groove (17) at the bottom of the offset groove (14); and a spring is provided between the offset block (16) and the offset groove (14).

6. The anti-dropping outdoor cable installation bridge according to claim 5 is characterized in that: Support plates (18) are integrally formed on both sides of the upper end of the offset block (16), a gripping block (20) is provided between the two support plates (18), and the lower part of the gripping block (20) is connected to the inner walls of the two support plates (18) via a second reset shaft (19).

7. The anti-dropping outdoor cable installation bridge according to claim 6 is characterized in that: The outer end of the gripping block (20) is arranged in an arc shape, and the minimum distance between the gripping block (20) and the limiting platform (15) is less than the thickness of the outer shifting plate (12).

8. The anti-dropping outdoor cable installation bridge according to claim 1, characterized in that: The distance between the inner barrier block (22) and the outer barrier block (26) is equal to the thickness of the side wall of the mounting cover (2), and the inner barrier block (22) and the outer barrier block (26) are arranged parallel to each other.

9. The anti-dropping outdoor cable installation bridge according to claim 1, characterized in that: A conical air inlet (33) is provided on a side plate of the bridge frame body (1) away from the mounting cover (2); a concave wind shield (34) is provided in the bridge frame body (1) inside the air inlet (33); the upper end of the wind shield (34) is connected to the top of the bridge frame body (1) via a third reset shaft (35); a collision ball (36) is provided on the side of the wind shield (34) away from the lower part of the air inlet (33); the lower end of the collision ball (36) is connected to the bottom of the bridge frame body (1) via an amplitude strip (37); the opening diameter of the wind shield (34) at one end of the wind shield (34) is smaller than the opening diameter at the other end; a drainage outlet (32) is provided at the bottom of the bridge frame body (1) below the wind shield (34).

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