Typhoon protection billboard

Abstract

The present invention relates to a typhoon-proof billboard, comprising a main frame and a billboard cavity, wherein a transmission cavity is provided inside the lower end of the main frame, and a secondary gear is installed inside the transmission cavity, and a billboard cavity is provided in the middle of the main frame. The beneficial effects of the present invention are as follows: the typhoon-proof billboard is provided with a wind sensor, a solar photovoltaic panel, a battery and a motor, and the wind force can be detected by the NZ-FS wind sensor provided in the device. When the wind force exceeds the specification, the information is transmitted to the system main controller, and then the control motor is turned on, and the operation of the motor drives the main gear connected to the lower end of the second rotating shaft to operate, thereby rotating the secondary gear meshing with the main gear, and finally driving the billboard body connected to the first rotating shaft to rotate 90°, so that when the wind force is too strong, air can pass through the gap after rotation, preventing the billboard from being overturned and damaged due to excessive force, and at the same time, the energy for the operation of the storage device is stored through the solar photovoltaic panel and the battery in daily life.

Description

Technical Field

[0001] The invention relates to the field of billboards, in particular to typhoon-proof billboards. Background Art

[0002] Billboards refer to all outdoor media that convey advertising information. Whether it is business or some public welfare undertakings, it is necessary to publicize its information, and billboards are used outdoors to facilitate passers-by to see them.

[0003] Traditional billboards are welded, installed, and placed outdoors, and use advertising patterns or display screens to promote information, achieving a convenient promotion effect.

[0004] A billboard disclosed in the Chinese invention patent application publication specification CN201710007245 has the advantages of being able to be quickly assembled or disassembled at the construction site and eliminating the weak links of the fixing frame after welding. However, after the billboard is fixed and installed, the fixing of the billboard by its fixing frame is still not particularly stable, and the billboard does not have a windproof function. When installed in places where typhoons are frequent, strong winds may cause the billboard to topple over. Summary of the invention

[0005] The purpose of the present invention is to provide a typhoon-proof billboard to solve the problem of a billboard disclosed in the Chinese invention patent application publication specification CN201710007245 proposed in the above-mentioned background technology. Although the billboard has the advantages of being able to quickly assemble or disassemble the billboard at the construction site and eliminating the weak links of the fixing frame after welding, after the billboard is fixed and installed, the fixing of the billboard by its fixing frame is still not particularly stable, and the billboard does not have a windproof function. When installed in some places where typhoons frequently occur, strong winds will cause the billboard to topple over.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a typhoon-proof billboard, comprising a main frame and a billboard cavity, a transmission cavity is arranged inside the lower end of the main frame, and a secondary gear is installed inside the transmission cavity, a billboard cavity is arranged in the middle part of the main frame, the upper end of the secondary gear is connected to the first rotating shaft, and a billboard body is installed on the outer side of the first rotating shaft, the billboard body and the first rotating shaft are fixedly connected, the upper end of the first rotating shaft is connected to a bearing, and a top plate is installed on the upper end of the main frame.

[0007] Preferably, a rain shield is installed above the billboard cavity, the length of the rain shield is equal to the length of the billboard cavity, the width of the billboard cavity is smaller than the width of the rain shield, and the rain shield is an arc-shaped structure.

[0008] Preferably, the sign bodies are evenly distributed about the horizontal center line of the billboard cavity, and the sign bodies form a rotating structure through the first rotating shaft and the bearing, and the sign bodies are tightly fitted.

[0009] Preferably, an adhesive tape is installed in the middle of the upper end of the top plate, and the left and right ends of the adhesive tape are connected to bird-proof tapes. The top plate includes the bird-proof tape and the adhesive tape. The top plate is welded to the main frame. The bird-proof tapes are symmetrically distributed about the horizontal center line of the adhesive tape, and four bird-proof tapes are provided.

[0010] Preferably, a wind sensor is installed on the upper left end of the main frame, and a solar photovoltaic panel is provided on the outer wall below the wind sensor, a battery is installed on the lower end of the solar photovoltaic panel, a heat sink is connected to the middle outer wall of the left end of the main frame, a motor is installed inside the lower left end of the main frame, and a second rotating shaft is installed at the lower end of the motor, a main gear is connected to the lower end of the second rotating shaft, the motor forms a rotating structure with the main gear through the second rotating shaft, and the vertical center line of the second rotating shaft is perpendicular to the horizontal center line of the main frame.

[0011] Preferably, the right end outer wall of the main frame is connected to a first fixing rope, and the left and right outer walls of the main frame are installed with a second fixing rope, the second fixing rope is equal to the first fixing rope in length, and the first fixing rope and the second fixing rope are symmetrically distributed about the vertical center line of the main frame.

[0012] Preferably, the first side panel frame is located at the lower left end of the main frame, and a fixed panel frame is provided to the right of the first side panel frame, and a mounting block is installed at the front lower end of the fixed panel frame, the upper end of the mounting block is connected with a first screw, and a cushion layer is installed at the lower end of the mounting block, the first side panel frame and the mounting block are welded, a fixed panel frame is installed to the right of the first side panel frame, and a second side panel frame is provided to the right of the fixed panel frame, a support plate is fixed to the lower middle end of the main frame, the first side panel frame and the second side panel frame are symmetrically distributed about the vertical center line of the support plate, and the angle between the first side panel frame and the main frame is 40°.

[0013] Preferably, a connecting plate is installed on the upper end of the support plate, and the connecting plate and the main frame are welded, the outer wall of the connecting plate is connected to a second screw, the support plate forms a threaded structure through the connecting plate and the second screw, and the upper end area of ​​the connecting plate is equal to the lower end area of ​​the main frame.

[0014] Preferably, the ventilation holes are located on the outer wall of the card body, the ventilation holes are evenly distributed about the vertical center line of the card body, and the ventilation holes are equidistantly distributed, and the depth of the ventilation holes is equal to the width of the card body.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention provides a billboard cavity and a rain shield, so that the billboard cavity has a transparent space for installing the billboard body and facilitating the movement of the billboard body, and a rain shield is provided above the billboard. Since the rain shield is an arc-shaped structure, it has a shielding effect and can slide from the upper end to both sides when rain falls, thereby providing a certain protection and rainproof effect on the inside of the billboard cavity and increasing the service life of the device.

[0017] 2. The present invention provides a top plate, a bird-proofing tape and an adhesive tape, and the bird-proofing tape is evenly bonded by the adhesive tape connected to the outer wall of the upper end of the top plate. Moreover, since the bird-proofing tape is made of brightly colored materials, it can drive away birds and prevent birds from perching on the billboard and causing certain damage to it.

[0018] 3. The present invention can detect the size of the wind force through the arrangement of wind sensors, solar photovoltaic panels, batteries and motors, and through the action of the NZ-FS wind sensor arranged in the device. When the wind force exceeds the specification, the information is transmitted to the system main controller, and then the control motor is turned on. The operation of the motor drives the main gear connected to the lower end of the second shaft to rotate, thereby rotating the secondary gear meshing with the main gear, and finally driving the sign body connected to the first shaft to rotate 90°. In this way, when the wind force is too strong, the air can pass through the gap after rotation, preventing the billboard from being overturned and damaged due to excessive force. At the same time, the energy for the operation of the device is stored through the solar photovoltaic panels and batteries in daily life.

[0019] 4. The present invention arranges air vents on the billboard body that are uniformly small. When it is windy and the wind force does not reach the specification, the billboard body is closed and the blown air can flow away through the air vents, thereby reducing the stress on the billboard and increasing its service life. In addition, the air vents are small and will not affect the visual effect of the billboard pattern.

[0020] 5. The present invention arranges the first fixing rope, the second fixing rope, the first side panel frame, the support plate, the second side panel frame and the mounting block. The first fixing rope and the second fixing rope are connected to the upper end of the billboard to form a triangular structure, which plays a role in stabilizing the fixing device. In addition, the first side panel frame, the support plate and the second side panel frame are installed at the lower end of the billboard. Since the triangular stable structure is formed by the uniform billboard, the bottom end of the device has more stable points, which further enhances its stability. At the same time, the first screw is connected to the ground base through the mounting block for fixing, and the second screw is connected to the main frame through the connecting plate, which facilitates the installation and fixation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the typhoon-proof billboard of the present invention;

[0022] Figure 2It is a schematic diagram of the side structure of the typhoon-proof billboard of the present invention;

[0023] Figure 3 It is a schematic diagram of the connection structure between the top plate and the bird-proof belt of the typhoon-proof billboard of the present invention;

[0024] Figure 4 The typhoon-proof billboard of the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0025] Figure 5 The figure is a schematic diagram of the working process of the typhoon-proof billboard of the present invention.

[0026] In the figure: 1. main frame; 2. transmission cavity; 3. secondary gear; 4. billboard cavity; 5. billboard body; 6. first fixing rope; 7. first rotating shaft; 8. bearing; 9. rain shield; 10. top plate; 11. wind sensor; 12. solar photovoltaic panel; 13. battery; 14. heat sink; 15. second fixing rope; 16. motor; 17. second rotating shaft; 18. main gear; 19. first side panel frame; 20. fixed panel frame; 21. mounting block; 22. first screw; 23. cushion layer; 24. second side panel frame; 25. support plate; 26. connecting plate; 27. second screw; 28. bird-proof tape; 29. ​​adhesive tape; 30. vent. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] See also Figure 1-5The present invention provides a technical solution: a typhoon-proof billboard, comprising a main frame 1, a transmission cavity 2, a secondary gear 3, a billboard cavity 4, a billboard body 5, a first fixing rope 6, a first rotating shaft 7, a bearing 8, a rain shield 9, a top plate 10, a wind sensor 11, a solar photovoltaic panel 12, a battery 13, a heat sink 14, a second fixing rope 15, a motor 16, a second rotating shaft 17, a main gear 18, a first side plate frame 19, a fixing plate frame 20, a mounting block 21, a first screw 22, a cushion layer 23, a second side plate frame 24, a support plate 25, a connecting plate 26, a second screw 27, a bird-proof belt 28, an adhesive belt 29 and a vent 30, a transmission cavity 2 is arranged inside the lower end of the main frame 1, and a secondary gear 3 is installed inside the transmission cavity 2, and a gear 28 is arranged in the middle of the main frame 1. The billboard cavity 4, the upper end of the secondary gear 3 is connected to the first rotating shaft 7, and the outer side of the first rotating shaft 7 is installed with a sign body 5, the sign body 5 and the first rotating shaft 7 are fixedly connected, the upper end of the first rotating shaft 7 is connected with a bearing 8, the upper end of the main frame 1 is installed with a top plate 10, and a rain shield 9 is installed above the billboard cavity 4. The length of the rain shield 9 is equal to the length of the billboard cavity 4, and the width of the billboard cavity 4 is smaller than the width of the rain shield 9, and the rain shield 9 is an arc-shaped structure. The billboard cavity 4 has a transparent space for installing the sign body 5 and facilitating the movement of the sign body 5, and a rain shield 9 is arranged above it. Due to the characteristics of the rain shield 9 as an arc-shaped structure, it has a shielding effect, and when rain falls, it can slide from its upper end to both sides, to the inside of the billboard cavity 4 It has a certain protective rainproof effect and increases the service life of the device. The sign body 5 is evenly distributed about the horizontal center line of the billboard cavity 4, and the sign body 5 forms a rotating structure through the first rotating shaft 7 and the bearing 8, and the sign bodies 5 are tightly fitted. An adhesive tape 29 is installed in the middle of the upper end of the top plate 10, and the left and right ends of the adhesive tape 29 are connected with bird-proof tapes 28. The top plate 10 includes the bird-proof tape 28 and the adhesive tape 29. The top plate 10 is welded to the main frame 1. The bird-proof tape 28 is symmetrically distributed about the horizontal center line of the adhesive tape 29, and four bird-proof tapes 28 are provided. The bird-proof tape 28 is evenly bonded through the action of the adhesive tape 29 connected to the outer wall of the upper end of the top plate 10, and because the bird-proof tape 28 is made of bright-colored material, it will have a repelling effect on birds. , to prevent birds from perching on the billboard and causing certain damage to it, a wind sensor 11 is installed on the upper left end of the main frame 1, and a solar photovoltaic panel 12 is arranged on the outer wall below the wind sensor 11, and a battery 13 is installed on the lower end of the solar photovoltaic panel 12, and a heat sink 14 is connected to the outer wall of the middle part of the left end of the main frame 1, and a motor 16 is installed inside the lower left end of the main frame 1, and a second rotating shaft 17 is installed at the lower end of the motor 16, and a main gear 18 is connected to the lower end of the second rotating shaft 17, and the motor 16 forms a rotating structure with the main gear 18 through the second rotating shaft 17, and the vertical center line of the second rotating shaft 17 is perpendicular to the horizontal center line of the main frame 1, and the wind force can be detected by the NZ-FS wind sensor 11 set in the device,When the wind force exceeds the specification, the information is transmitted to the system main controller, and then the control motor 16 is turned on. The operation of the motor 16 drives the main gear 18 connected to the lower end of the second rotating shaft 17 to operate, thereby rotating the secondary gear 3 meshing with the main gear 18, and finally drives the sign body 5 connected to the first rotating shaft 7 to rotate 90°. In this way, when the wind force is too strong, the air can pass through the gap after rotation to prevent the billboard from being overturned and damaged due to excessive force. At the same time, the energy for the operation of the device is stored through the solar photovoltaic panel 12 and the battery 13 on a daily basis. The right end outer wall of the main frame 1 is connected to the first fixed rope 6, and the left and right outer walls of the main frame 1 are installed with the second fixed rope 15. The second fixed rope 15 is equal to the length of the first fixed rope 6, and the first fixed rope The fixed rope 6 and the second fixed rope 15 are symmetrically distributed about the vertical center line of the main frame 1. The first side plate frame 19 is located at the lower end of the left side of the main frame 1, and a fixed plate frame 20 is arranged on the right side of the first side plate frame 19, and a mounting block 21 is installed at the lower front end of the fixed plate frame 20, and a first screw 22 is connected to the upper end of the mounting block 21, and a cushion layer 23 is installed at the lower end of the mounting block 21. The first side plate frame 19 and the mounting block 21 are welded. A fixed plate frame 20 is installed on the right side of the first side plate frame 19, and a second side plate frame 24 is arranged on the right side of the fixed plate frame 20. A support plate 25 is fixed to the lower middle end of the main frame 1, and the first side plate frame 19 and the second side plate frame 24 are symmetrically distributed about the vertical center line of the support plate 25, and the first side plate frame 19 and the second side plate frame 24 are symmetrically distributed about the vertical center line of the support plate 25. The angle between the side panel frame 19 and the main frame 1 is 40°. The first fixing rope 6 and the second fixing rope 15 are connected to the upper end of the billboard to form a triangular structure, which plays a role in stabilizing the fixing device. In addition, the first side panel frame 19, the support plate 25, and the second side panel frame 24 are installed at the lower end of the billboard. Since the uniform billboard forms a triangular stable structure, the bottom end of the device has more stable points, which further enhances its stability. At the same time, the first screw 22 is connected to the ground base through the mounting block 21 for fixing, and the connecting plate 26 is connected to the second screw 27 on the main frame 1, which is convenient for installing and fixing the device. The upper end of the support plate 25 is installed with a connecting plate 26, and the connecting plate 26 and the main frame 1 are welded. The outer wall is connected with a second screw 27, and the support plate 25 forms a threaded structure with the second screw 27 through the connecting plate 26, and the upper end area of ​​the connecting plate 26 is equal to the lower end area of ​​the main frame 1. The vents 30 are located on the outer wall of the sign body 5, and the vents 30 are evenly distributed about the vertical center line of the sign body 5, and the vents 30 are evenly distributed, and the depth of the vents 30 is equal to the width of the sign body 5. The sign body 5 is provided with vents 30 that need to be uniformly small. When the wind blows and the wind force does not reach the specification, the sign body 5 is closed, and the blown air can flow away through the vents 30, thereby reducing the force on the billboard and increasing its service life. In addition, the vents 30 are small and will not affect the visual effect of the billboard pattern.

[0031] In summary, when the typhoon-proof billboard is in use, the first fixing rope 6 and the second fixing rope 15 are connected to the upper end of the billboard to form a triangular structure, which plays a role in stabilizing the fixing device. In addition, the first side panel frame 19, the support plate 25, and the second side panel frame 24 are installed at the lower end of the billboard. Since the billboard forms a triangular stable structure, the bottom end of the device has more stable points, which further enhances its stability. At the same time, the first screw 22 is connected to the ground base through the mounting block 21 for fixing, and the connecting plate 26 is connected to the second screw 27 to the main frame 1. This makes it easy to install and fix the device. Then, the device evenly bonds the bird-proof belt 28 through the adhesive tape 29 connected to the outer wall of the upper end of the top plate 10. Moreover, since the bird-proof belt 28 is made of bright-colored material, it will have a repelling effect on birds, preventing birds from perching on the billboard and causing certain damage to it. Moreover, the billboard cavity 4 has a transparent space for installing the sign body 5 and facilitating the activities of the sign body 5. A rain shield 9 is arranged above it. Due to the characteristics of the rain shield 9 being an arc-shaped structure, it has a shielding effect and is convenient for when rain falls. It can slide down from the upper end to both sides, which has a certain protection effect on the inside of the billboard cavity 4 and increases the service life of the device. When encountering typhoon weather, the wind force can be detected by the NZ-FS wind sensor 11 set in the device. When the wind force exceeds the specification, the information is transmitted to the system main controller, and then the control motor 16 is turned on. The operation of the motor 16 drives the main gear 18 connected to the lower end of the second rotating shaft 17 to operate, thereby causing the secondary gear 3 meshing with the main gear 18 to rotate, and finally drives the billboard body 5 connected to the first rotating shaft 7 to rotate 90 °, so that when the wind is too strong, the air can pass through the gap after rotation, preventing the billboard from being overturned and damaged due to excessive force. At the same time, the energy for the operation of the storage device is stored through the solar photovoltaic panel 12 and the battery 13. At the same time, a uniformly small vent hole 30 is set on the sign body 5. When it is windy and the wind force does not reach the specification, the sign body 5 is closed, and the blown air can flow away through the vent hole 30, thereby reducing the force on the billboard and increasing its service life. In addition, the vent hole 30 is small and will not affect the visual effect of the billboard pattern.

[0032] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A typhoon-proof billboard, comprising a main frame (1) and a first side frame (19), characterized in that: A transmission chamber (2) is provided inside the lower end of the main frame (1), and a secondary gear (3) is installed inside the transmission chamber (2); a billboard chamber (4) is provided in the middle of the main frame (1); the upper end of the secondary gear (3) is connected to a first rotating shaft (7), and a billboard body (5) is installed on the outer side of the first rotating shaft (7); the billboard body (5) and the first rotating shaft (7) are fixedly connected; the upper end of the first rotating shaft (7) is connected to a bearing (8); and a top plate (10) is installed on the upper end of the main frame (1); the billboard body (5) is connected to the advertising The horizontal center line of the card cavity (4) is evenly distributed, and the card body (5) forms a rotating structure through the first rotating shaft (7) and the bearing (8), and the card bodies (5) are tightly fitted; an adhesive tape (29) is installed in the middle of the upper end of the top plate (10), and the left and right ends of the adhesive tape (29) are connected with bird-proof tapes (28), the top plate (10) includes the bird-proof tape (28) and the adhesive tape (29), the top plate (10) and the main frame (1) are welded, and the bird-proof tape (28) is symmetrically distributed about the horizontal center line of the adhesive tape (29). , and four bird-proof belts (28) are provided; a wind sensor (11) is installed at the upper left end of the main frame (1), and a solar photovoltaic panel (12) is provided on the lower outer wall of the wind sensor (11), and a storage battery (13) is installed at the lower end of the solar photovoltaic panel (12); a heat sink (14) is connected to the outer wall of the middle part of the left end of the main frame (1); a motor (16) is installed inside the lower left end of the main frame (1), and a second rotating shaft (17) is installed at the lower end of the motor (16), and the lower end of the second rotating shaft (17) is connected to the main frame (1). gear (18), the motor (16) and the main gear (18) form a rotating structure through the second rotating shaft (17), and the vertical center line of the second rotating shaft (17) is perpendicular to the horizontal center line of the main frame (1); the right end outer wall of the main frame (1) is connected with a first fixing rope (6), and the left and right outer walls of the main frame (1) are installed with a second fixing rope (15), the second fixing rope (15) and the first fixing rope (6) are equal in length, and the first fixing rope (6) and the second fixing rope (15) are symmetrically distributed about the vertical center line of the main frame (1);The first side plate frame (19) is located at the lower left end of the main frame (1), and a fixed plate frame (20) is arranged on the right side of the first side plate frame (19), and a mounting block (21) is installed at the lower front end of the fixed plate frame (20), the upper end of the mounting block (21) is connected with a first screw (22), and the lower end of the mounting block (21) is installed with a cushion layer (23), the first side plate frame (19) and the mounting block (21) are welded, and a fixed plate frame (20) is installed on the right side of the first side plate frame (19). The main frame (1) is provided with a plate frame (20), and a second side plate frame (24) is arranged on the right side of the fixed plate frame (20); a support plate (25) is fixed at the lower end of the middle part of the main frame (1); the first side plate frame (19) and the second side plate frame (24) are symmetrically distributed with respect to the vertical center line of the support plate (25), and the angle between the first side plate frame (19) and the main frame (1) is 40°; the outer wall of the sign body (5) is provided with a vent hole (30), and the vent hole (30) is uniformly spaced with respect to the vertical center line of the sign body (5). The vent holes (30) are distributed at equal distances from each other, and the depth of the vent holes (30) is equal to the width of the plate body (5); when encountering typhoon weather, the wind force is detected by the wind sensor (11). When the wind force exceeds the specification, the information is transmitted to the system main controller, and then the control motor (16) is turned on. The motor (16) drives the main gear (18) connected to the lower end of the second rotating shaft (17) to rotate, thereby causing the secondary gear (3) meshing with the main gear (18) to rotate, and finally the secondary gear (3) meshing with the main gear (18) is driven. The sign body (5) connected to the first rotating shaft (7) is rotated 90 degrees, so that when the wind force is too strong, air passes through the gap after rotation, preventing the billboard from being overturned and damaged due to excessive force. At the same time, the energy for the operation of the storage device is stored through the solar photovoltaic panel (12) and the battery (13) in daily life. At the same time, a uniformly small vent hole (30) is set on the sign body (5). When the wind blows and the wind force does not reach the specification, the gap between the sign body (5) is closed, and the blown air flows away through the vent hole (30). ; 2. The typhoon-proof billboard according to claim 1, characterized in that: A rain shield (9) is installed above the billboard cavity (4); the length of the rain shield (9) is equal to the length of the billboard cavity (4); the width of the billboard cavity (4) is smaller than the width of the rain shield (9); and the rain shield (9) is an arc-shaped structure.

3. The typhoon-proof billboard according to claim 1, characterized in that: A connecting plate (26) is installed at the upper end of the support plate (25), and the connecting plate (26) is welded to the main frame (1). The outer wall of the connecting plate (26) is connected to a second screw (27). The support plate (25) forms a threaded structure through the connecting plate (26) and the second screw (27), and the upper end area of ​​the connecting plate (26) is equal to the lower end area of ​​the main frame (1).

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