Street lamp type parking apron structure for unmanned aerial vehicle

Abstract

The parking apron structure for the street lamp type unmanned aerial vehicle comprises a base, a rectangular hollow rod is fixedly arranged on the top face of the base, a mounting connecting frame is arranged on one side of the rectangular hollow rod, a lifting adjusting mechanism is arranged between the mounting connecting frame and the rectangular hollow rod, and the mounting connecting frame and the rectangular hollow rod are connected through the lifting adjusting mechanism; a first parking plate and a second parking plate are arranged above the mounting connecting frame, an angle adjusting mechanism is mounted at one end of the mounting connecting frame, and the angle adjusting mechanism is used for adjusting the angle of the first parking plate and the angle of the second parking plate. Through cooperative arrangement of all the structures, flexible height adjustment and flexible angle adjustment of the device are facilitated, and meanwhile, the device is easy to operate and beneficial to popularization.

Description

Technical Field

[0001] The present invention relates to the technical field related to outdoor parking aprons for unmanned aerial vehicles, and in particular to a parking apron structure for street lamp-type unmanned aerial vehicles. Background Art

[0002] At present, drones are widely used in surveying and mapping, aerial photography, traffic monitoring, express delivery and other fields because of their advantages such as strong maneuverability, wide field of vision and flight routes not restricted by terrain. With the increase in the number of drones and the expansion of their application occasions, the probability of drone formations appearing in local areas will become higher and higher. However, during the flight of drones, due to the limited capacity of their energy storage batteries, in order to prevent drones from falling from high altitudes, drones need to be flown to the designated location of the street lamp pole apron and parked, so that the staff can find them easily without occupying the ground position.

[0003] The Chinese utility model application number is 202322034675.5, and the name of the patent document is a drone landing pad based on a street light pole, including a bearing seat that can contact the parked drone, a plurality of reinforcing beams are arranged around the bottom of the bearing seat, a plurality of reinforcing beams are fixedly connected to the inner side of the plurality of reinforcing beams, a plurality of receiving arms are fixedly connected to the same middle seat, the receiving arms and the middle seat are both in contact with the lower surface of the bearing seat, a compression-resistant structure is installed directly below the middle seat, a positioning structure is arranged on the compression-resistant structure, and the positioning structure extends to one side of the bearing seat for connecting to the street light pole;

[0004] Although the above patent document can realize the temporary parking operation of the drone, there are still some problems. Since the positioning structure is directly connected to the street light pole, it is not convenient to flexibly adjust the height of the device according to actual needs. At the same time, the bearing seat, the middle seat and the extension arm are fixed and integrated, which is not convenient for adjusting the angle, thereby reducing the practicality of the overall device;

[0005] Therefore, based on the above problems, the present invention provides a helipad structure for a streetlight-type UAV. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a helipad structure for a streetlight-type UAV, which solves the problems mentioned in the background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A streetlight-type drone landing pad structure comprises a base, a rectangular hollow rod is fixedly arranged on the top surface of the base, a mounting frame is arranged on one side of the rectangular hollow rod, a lifting and adjusting mechanism is arranged between the mounting frame and the rectangular hollow rod and connected through the lifting and adjusting mechanism;

[0009] A first stop plate and a second stop plate are arranged above the mounting frame, and an angle adjustment mechanism is installed at one end of the mounting frame, and the angle adjustment mechanism is used to adjust the angles of the first stop plate and the second stop plate.

[0010] Furthermore, the first shutdown board and the second shutdown board are both solar panels, and the first shutdown board and the second shutdown board are configured with the same specifications.

[0011] Furthermore, the lifting and adjusting mechanism includes a mounting block, the mounting block is fixedly arranged in the rectangular hollow rod, a matching sealing plate is arranged above the mounting block, and the matching sealing plate is fixedly arranged on the top surface of the rectangular hollow rod;

[0012] A rectangular through groove is penetrated on one side of the rectangular hollow rod, a limit slider is slidably provided in the rectangular through groove, the limit slider is fixedly connected to the mounting frame, a mounting screw barrel is penetrated and fixed on the limit slider, an adjusting screw is provided on the inner thread of the mounting screw barrel, one end of the adjusting screw penetrates and is rotatably arranged on the matching sealing plate and is fixedly provided with a driven pulley, a driving assembly is arranged between the driven pulley and the rectangular hollow rod, and the other end of the adjusting screw is rotatably connected to the mounting block.

[0013] Furthermore, T-shaped blocks are fixedly provided on both sides of the limit sliding block, and two L-shaped connecting plates are fixedly provided on the front and rear inner walls of the rectangular hollow rod, and each of the T-shaped blocks is slidably provided on two adjacent L-shaped connecting plates.

[0014] Furthermore, the drive assembly includes an L-shaped mounting plate, which is fixedly connected to the rectangular hollow rod. A first motor is fixedly installed on the L-shaped mounting plate. A driving pulley is fixedly installed on the power output end of the first motor. A driving belt is arranged between the driving pulley and the driven pulley and the driving belt is connected through the driving belt transmission.

[0015] Further, the angle adjustment mechanism includes a mounting disc, a second motor, and two third motors, the mounting disc is fixedly connected to the mounting frame, a fixing ring is fixedly provided on the top surface of the mounting disc, a plurality of lighting lamps are installed on the bottom surface of the mounting disc, and a rotating ring is rotatably provided on the fixing ring, an adjusting gear ring is fixedly provided on the rotating ring, the second motor is fixedly provided on the mounting frame through and through, an adjusting gear is fixedly provided on the power output end of the second motor, a mating gear is meshedly provided on the adjusting gear, the mating gear is meshedly connected with the adjusting gear ring, a mating shaft is provided between the mating gear and the mounting frame and connected through the mating shaft;

[0016] A mounting plate is fixedly provided on the top surface of the rotating ring, a mounting connecting block is fixedly provided on the mounting connecting block, a rotating rod is rotatably provided on the rotating rod, two first sleeves are rotatably sleeved on the rotating rod, a first matching bevel gear and a first L-shaped matching block are fixedly sleeved on each of the first sleeves, each of the first L-shaped matching blocks are fixedly connected to the first stop plate, a second sleeve is provided on one side of each of the first sleeves, each of the second sleeves is rotatably sleeved on the rotating rod, and a second matching bevel gear and a second L-shaped matching block are fixedly sleeved on each of the second sleeves, each of the second L-shaped matching blocks are fixedly connected to the second stop plate, each of the third motors is fixedly provided on the mounting plate, an adjusting bevel gear is fixedly provided on the power output end of each of the third motors, and each of the first matching bevel gear and the corresponding second matching bevel gear are meshed and connected with the corresponding adjusting bevel gear.

[0017] Furthermore, a limiting ring groove is formed through the fixed ring, a limiting swivel is rotatably arranged in the limiting ring groove, and the limiting swivel is fixedly connected to the swivel.

[0018] Furthermore, a plurality of triangular reinforcement plates are evenly fixed between the base and the rectangular hollow rod.

[0019] The present invention provides a streetlight-type drone parking apron structure. Compared with the prior art, it has the following beneficial effects:

[0020] 1. The present invention drives the installation frame, angle adjustment mechanism, lighting lamp, first stop plate and second stop plate to flexibly adjust the height through the coordinated arrangement of the lifting adjustment mechanism and the driving assembly. In this way, the height of the device can be flexibly adjusted according to the later lighting needs or the parking needs of the UAV, which is conducive to increasing the practicality of the overall device.

[0021] 2. The present invention facilitates flexible angle adjustment and rotation adjustment of the first parking board and the second parking board through the setting of the angle adjustment mechanism. When the drone needs to be parked, the first parking board and the second parking board can be adjusted to a horizontal state. When parking is not required, the solar panels, that is, the first parking board and the second parking board, can be adjusted in angle according to the angle of the sun, thereby facilitating better conversion of solar energy into electrical energy and storing it for power supply to later equipment, which is beneficial to increase the practicality of the overall device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 The main view of the three-dimensional connection diagram of the overall structure of the present invention is shown;

[0024] Figure 2 A schematic diagram of a three-dimensional connection of a main view half-section structure of the present invention is shown;

[0025] Figure 3 It shows a three-dimensional connection schematic diagram of the main view half-section structure of the base, the rectangular hollow rod and the lifting and lowering adjustment mechanism of the present invention;

[0026] Figure 4 A three-dimensional connection schematic diagram of the lifting and lowering adjustment mechanism of the present invention is shown;

[0027] Figure 5 A schematic diagram of the three-dimensional split structure of the angle adjustment mechanism of the present invention is shown;

[0028] Figure 6 The present invention is shown Figure 2 A schematic diagram of the enlarged structure at point A;

[0029] As shown in the figure: 1. Base; 2. Triangular reinforcement plate; 3. Rectangular hollow rod; 4. Mounting frame; 5. Lifting adjustment mechanism; 51. Active pulley; 52. Driven pulley; 53. Driving belt; 54. L-shaped mounting plate; 55. First motor; 56. Limiting slider; 57. T-shaped block; 58. Mounting screw barrel; 59. Adjusting screw; 591. Mounting block; 6. Angle adjustment mechanism; 61. Second motor; 611. Adjusting gear; 612. Matching gear; 62. Fixing ring; 621. Limiting ring groove; 63. swivel; 631. limit swivel; 632. adjusting gear ring; 64. mounting plate; 641. mounting connecting block; 642. third motor; 643. adjusting bevel gear; 65. first L-shaped matching block; 651. first matching bevel gear; 652. first sleeve; 66. second L-shaped matching block; 661. second matching bevel gear; 662. second sleeve; 67. mounting disc; 68. rotating rod; 7. first stop plate; 8. rectangular through groove; 9. second stop plate; 10. L-shaped connecting plate; 11. lighting lamp. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1

[0032] In order to solve the technical problems in the background technology, a parking apron structure for a street lamp type UAV is provided as follows:

[0033] Combination Figure 1-6 As shown, the present invention provides a streetlight type drone landing pad structure, comprising a base 1, a rectangular hollow rod 3 is fixedly arranged on the top surface of the base 1, and a plurality of triangular reinforcement plates 2 are evenly fixedly arranged between the base 1 and the rectangular hollow rod 3. A mounting bracket 4 is arranged on one side of the rectangular hollow rod 3, and a lifting and adjusting mechanism 5 is arranged between the mounting bracket 4 and the rectangular hollow rod 3 and connected through the lifting and adjusting mechanism 5;

[0034] A first stop plate 7 and a second stop plate 9 are arranged above the mounting bracket 4 , and an angle adjustment mechanism 6 is installed at one end of the mounting bracket 4 . The angle adjustment mechanism 6 is used to adjust the angles of the first stop plate 7 and the second stop plate 9 .

[0035] The first shutdown board 7 and the second shutdown board 9 are both solar panels, and the first shutdown board 7 and the second shutdown board 9 are configured with the same specifications.

[0036] The lifting and lowering adjustment mechanism 5 includes a mounting block 591, which is fixedly arranged in the rectangular hollow rod 3, and a matching sealing plate is arranged above the mounting block 591, which is fixedly arranged on the top surface of the rectangular hollow rod 3;

[0037] A rectangular through groove 8 is penetrated on one side of the rectangular hollow rod 3, and a limit slider 56 is slidably provided in the rectangular through groove 8. The limit slider 56 is fixedly connected to the mounting frame 4, and a mounting screw barrel 58 is penetrated and fixed on the limit slider 56. An adjusting screw 59 is provided on the inner thread of the mounting screw barrel 58. One end of the adjusting screw 59 penetrates and is rotatably arranged on a matching sealing plate and is fixedly provided with a driven pulley 52. ​​A driving assembly is arranged between the driven pulley 52 and the rectangular hollow rod 3, and the other end of the adjusting screw 59 is rotatably connected to the mounting block 591.

[0038] T-shaped blocks 57 are fixedly provided on both sides of the limit slider 56 , and two L-shaped connecting plates 10 are fixedly provided on the front and rear inner walls of the rectangular hollow rod 3 , and each T-shaped block 57 is slidably provided on two adjacent L-shaped connecting plates 10 .

[0039] The driving assembly includes an L-shaped mounting plate 54, which is fixedly connected to the rectangular hollow rod 3. A first motor 55 is fixedly provided on the L-shaped mounting plate 54. A driving pulley 51 is fixedly provided on the power output end of the first motor 55. A driving belt 53 is provided between the driving pulley 51 and the driven pulley 52 and is connected through the driving belt 53.

[0040] In specific use, when the height of the device needs to be flexibly adjusted, it is convenient to flexibly adjust the height of the first stop plate 7, the second stop plate 9 and the lighting lamp 11 in the later stage, so as to facilitate the parking of the drone in the later stage. The operation is as follows:

[0041] Start the first motor 55. Under the power output of the first motor 55, the active pulley 51 is driven to rotate, and then the driving belt 53 is driven to transmit. Under the transmission of the driving belt 53, the driven pulley 52 and the adjusting screw 59 are driven to rotate. At the same time, under the reaction force of the thread, the limit slider 56 is driven to slide and rise along the rectangular through groove 8. At the same time, each T-shaped block 57 is driven to slide and move along the corresponding two L-shaped connecting plates 10, and then the installation frame 4, the angle adjustment mechanism 6, the lighting lamp 11, the first stop plate 7 and the second stop plate 9 are driven to perform flexible height adjustment. In this way, it is convenient to perform flexible height adjustment operations on the device according to the later lighting needs or the drone shutdown needs, which is beneficial to increase the practicality of the overall device.

[0042] Embodiment 2

[0043] like Figure 1-6 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0044] The angle adjustment mechanism 6 includes a mounting disc 67, a second motor 61, and two third motors 642. The mounting disc 67 is fixedly connected to the mounting frame 4. A fixing ring 62 is fixedly provided on the top surface of the mounting disc 67. A plurality of lighting lamps 11 are installed on the bottom surface of the mounting disc 67. A rotating ring 63 is rotatably sleeved on the fixing ring 62. An adjusting gear ring 632 is fixedly provided on the rotating ring 63. The second motor 61 is fixedly provided on the mounting frame 4. An adjusting gear 611 is fixedly provided on the power output end of the second motor 61. A matching gear 612 is meshedly provided on the adjusting gear 611. The matching gear 612 is meshedly connected with the adjusting gear ring 632. A matching shaft is provided between the matching gear 612 and the mounting frame 4 and connected through the matching shaft.

[0045] The top surface of the swivel 63 is fixed with a mounting plate 64, and a mounting connecting block 641 is fixed on the mounting connecting block 641. A rotating rod 68 is rotatably provided on the mounting connecting block 641, and two first sleeves 652 are rotatably sleeved on the rotating rod 68. A first matching bevel gear 651 and a first L-shaped matching block 65 are fixedly sleeved on each first sleeve 652. Each first L-shaped matching block 65 is fixedly connected to the first stop plate 7. A second sleeve 662 is provided on one side of each first sleeve 652. Each second sleeve 662 is rotatably sleeved on the rotating rod 68. The movable sleeve is arranged on the rotating rod 68, and each second sleeve 662 is fixedly sleeved with a second matching bevel gear 661 and a second L-shaped matching block 66, each second L-shaped matching block 66 is fixedly connected to the second shutdown plate 9, each third motor 642 is fixedly arranged on the mounting plate 64, and an adjusting bevel gear 643 is fixedly arranged on the power output end of each third motor 642, and each first matching bevel gear 651 and the corresponding second matching bevel gear 661 are meshed and connected with the corresponding adjusting bevel gear 643.

[0046] A limiting ring groove 621 is formed through the fixed ring 62 . A limiting rotating ring 631 is rotatably arranged in the limiting ring groove 621 . The limiting rotating ring 631 is fixedly connected to the rotating ring 63 .

[0047] In specific use, based on the first embodiment, when it is necessary to further increase the practicality of the overall device, the operation is as follows:

[0048] Since the first parking board 7 and the second parking board 9 are both solar panels, and the first parking board 7 and the second parking board 9 are configured with the same specifications, when the drone needs to be parked, refer to Figure 1 , just adjust the first parking plate 7 and the second parking plate 9 to a horizontal state. When parking is not needed, the solar panels, that is, the first parking plate 7 and the second parking plate 9, can be adjusted in angle according to the angle of the sun, so as to facilitate the later conversion of solar energy into electrical energy and store it as power supply for later equipment. When the angle of the first parking plate 7 and the second parking plate 9 is adjusted, the third motor 642 is started, and the adjusting bevel gear 643 is driven to rotate under the power output of the third motor 642. At the same time, under the meshing operation, the first matching bevel gear 651 and the second matching bevel gear 661 on each adjusting bevel gear 643 are driven to rotate synchronously (the adjacent first matching bevel gear 651 and the second matching bevel gear 661 rotate in opposite directions), thereby driving each first sleeve 652 and the second sleeve 662 to rotate along the rotating rod 68. In this way, it is convenient to drive the first parking plate 7 and the second parking plate 9 to perform synchronous adjustment operations. When the drone needs to be parked, refer to Figure 1 , just adjust the first parking board 7 and the second parking board 9 to a horizontal state. When parking is not needed, the angle of the solar panels, that is, the first parking board 7 and the second parking board 9, can be adjusted according to the sun angle, so as to better convert solar energy into electrical energy and store it for power supply operation of later equipment;

[0049] When it is necessary to adjust its rotation, in order to further increase the practicality of the overall device, the second motor 61 is started, and the adjusting gear 611 is driven to rotate under the power output of the second motor 61. At the same time, under the meshing operation, the matching gear 612 and the matching shaft are driven to rotate synchronously. At the same time, under the meshing operation, the adjusting gear ring 632 and the rotating ring 63 are driven to rotate synchronously, and then the limiting rotating ring 631 is driven to rotate synchronously along the limiting ring groove 621, thereby driving the mounting plate 64, the first stop plate 7 and the second stop plate 9 to rotate and adjust. In this way, the practicality of the overall device is further increased.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A streetlight-type drone parking apron structure, characterized in that: The invention comprises a base (1), a rectangular hollow rod (3) being fixedly arranged on the top surface of the base (1), a mounting frame (4) being arranged on one side of the rectangular hollow rod (3), a lifting and lowering adjustment mechanism (5) being arranged between the mounting frame (4) and the rectangular hollow rod (3) and being connected via the lifting and lowering adjustment mechanism (5); A first stop plate (7) and a second stop plate (9) are arranged above the mounting frame (4), and an angle adjustment mechanism (6) is installed at one end of the mounting frame (4), and the angle adjustment mechanism (6) is used to adjust the angles of the first stop plate (7) and the second stop plate (9).

2. The streetlight-type drone parking apron structure according to claim 1, characterized in that: The first shutdown board (7) and the second shutdown board (9) are both solar panels, and the first shutdown board (7) and the second shutdown board (9) are configured with the same specifications.

3. The streetlight-type drone parking apron structure according to claim 1, characterized in that: The lifting and lowering adjustment mechanism (5) comprises a mounting block (591), wherein the mounting block (591) is fixedly arranged in the rectangular hollow rod (3), and a matching sealing plate is arranged above the mounting block (591), wherein the matching sealing plate is fixedly arranged on the top surface of the rectangular hollow rod (3); A rectangular through groove (8) is formed through one side of the rectangular hollow rod (3), a limit slider (56) is slidably provided in the rectangular through groove (8), the limit slider (56) is fixedly connected to the mounting frame (4), a mounting screw barrel (58) is formed through the limit slider (56), an adjusting screw (59) is provided with an internal thread of the mounting screw barrel (58), one end of the adjusting screw (59) is rotatably provided on a matching sealing plate and is fixedly provided with a driven pulley (52), a driving assembly is provided between the driven pulley (52) and the rectangular hollow rod (3), and the other end of the adjusting screw (59) is rotatably connected to the mounting block (591).

4. The streetlight-type drone parking apron structure according to claim 3, characterized in that: T-shaped blocks (57) are fixedly provided on both sides of the limit sliding block (56), and two L-shaped connecting plates (10) are fixedly provided on the front and rear inner walls of the rectangular hollow rod (3), and each of the T-shaped blocks (57) is slidably provided on two adjacent L-shaped connecting plates (10).

5. The streetlight-type drone parking apron structure according to claim 3, characterized in that: The driving assembly comprises an L-shaped mounting plate (54), the L-shaped mounting plate (54) being fixedly connected to the rectangular hollow rod (3), a first motor (55) being fixedly provided through the L-shaped mounting plate (54), a driving pulley (51) being fixedly provided at the power output end of the first motor (55), a driving belt (53) being provided between the driving pulley (51) and the driven pulley (52) and being connected in transmission through the driving belt (53).

6. The streetlight-type drone parking apron structure according to claim 1, characterized in that: The angle adjustment mechanism (6) comprises a mounting disc (67), a second motor (61), and two third motors (642); the mounting disc (67) is fixedly connected to the mounting frame (4); a fixing ring (62) is fixedly provided on the top surface of the mounting disc (67); a plurality of lighting lamps (11) are installed on the bottom surface of the mounting disc (67); a rotating ring (63) is rotatably sleeved on the fixing ring (62); an adjusting gear ring (632) is fixedly provided on the rotating ring (63); the second motor (61) is fixedly provided on the mounting frame (4); an adjusting gear (611) is fixedly provided on the power output end of the second motor (61); a matching gear (612) is meshedly provided on the adjusting gear (611); the matching gear (612) is meshedly connected to the adjusting gear ring (632); a matching shaft is provided between the matching gear (612) and the mounting frame (4) and is connected via the matching shaft; A mounting plate (64) is fixedly provided on the top surface of the rotating ring (63), a mounting connecting block (641) is fixedly provided on the mounting connecting block (641), a rotating rod (68) is rotatably provided on the mounting connecting block (641), two first sleeves (652) are rotatably sleeved on the rotating rod (68), each of the first sleeves (652) is fixedly sleeved with a first matching bevel gear (651) and a first L-shaped matching block (65), each of the first L-shaped matching blocks (65) is fixedly connected to the first stop plate (7), a second sleeve (662) is provided on one side of each of the first sleeves (652), and each of the second sleeves ( 662) are all rotatably sleeved on the rotating rod (68), and each of the second sleeves (662) is fixedly sleeved with a second matching bevel gear (661) and a second L-shaped matching block (66), and each of the second L-shaped matching blocks (66) is fixedly connected to the second shutdown plate (9), and each of the third motors (642) is fixedly installed on the mounting plate (64), and an adjusting bevel gear (643) is fixedly installed on the power output end of each of the third motors (642), and each of the first matching bevel gear (651) and the corresponding second matching bevel gear (661) are meshedly connected with the corresponding adjusting bevel gear (643).

7. The streetlight-type drone parking apron structure according to claim 6, characterized in that: A limiting ring groove (621) is formed through the fixing ring (62), a limiting rotating ring (631) is rotatably arranged in the limiting ring groove (621), and the limiting rotating ring (631) is fixedly connected to the rotating ring (63).

8. The streetlight-type drone parking apron structure according to claim 1, characterized in that: A plurality of triangular reinforcement plates (2) are evenly fixed between the base (1) and the rectangular hollow rod (3).

Images