Photovoltaic module mounting structure convenient to overturn

Abstract

The invention belongs to the technical field of photovoltaic module mounting, and particularly relates to a photovoltaic module mounting structure convenient to overturn, which comprises two bases, connecting seats are fixedly mounted on the two bases, supporting rods and telescopic mechanisms are arranged above the bases, and the bottoms of the supporting rods and the bottoms of the telescopic mechanisms are fixedly connected with the corresponding connecting seats respectively. The tops of the two supporting rods and the tops of the two telescopic mechanisms are hinged to the same photovoltaic support, a photovoltaic panel is fixedly installed on the top of the photovoltaic support, and the same adjusting mechanism is arranged between the two telescopic mechanisms and used for detecting the wind power and driving the two telescopic mechanisms to stretch out and draw back. The two telescopic mechanisms stretch out and draw back to drive the photovoltaic panel to turn over at different angles with the connection position of the photovoltaic support and the supporting rod as the circle center. According to the invention, by controlling the telescoping of the two telescoping mechanisms, the photovoltaic panel can present different inclination angles according to different illumination angles in four seasons, and it is ensured that the photovoltaic panel can be kept vertical to solar rays.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic assembly installation, and in particular to a photovoltaic assembly installation structure which is easy to flip. Background Art

[0002] A photovoltaic power generation device is a power generation device that uses photovoltaic modules to absorb solar radiation energy and convert it into electrical energy. However, the lighting angle is different throughout the year, and the fixed photovoltaic modules cannot keep their light-receiving surface perpendicular to the sunlight. Therefore, they cannot maximize the absorption of solar radiation and achieve the best power generation efficiency. Photovoltaic brackets with adjustable photovoltaic module angles can drive photovoltaic modules to dynamically change the installation angle, so that photovoltaic modules can track the position of the sun as much as possible so that their light-receiving surface is perpendicular to the sunlight. For example, patent No. 2022212287144 discloses an angle-adjustable photovoltaic bracket.

[0003] For photovoltaic modules installed on the plateau, due to environmental and weather reasons, when encountering strong winds, the inclined photovoltaic panels are easily blown over due to the large contact area with the strong wind. In addition, the strong wind can easily blow up flying sand and hit the photovoltaic panels, causing the photovoltaic panels to be scratched, which greatly affects the efficiency of the photovoltaic panels in absorbing sunlight. In addition, hail is very likely to occur on the plateau. If the hail falls directly on the photovoltaic panels, the photovoltaic panels are easily damaged. Therefore, a photovoltaic module installation structure that is easy to flip is proposed. Summary of the invention

[0004] In order to solve the shortcomings in the prior art, the present invention proposes a photovoltaic assembly installation structure that is easy to flip.

[0005] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a photovoltaic component installation structure that is easy to flip, comprising two bases, both of which are fixedly installed with connecting seats, support rods and telescopic mechanisms are provided above the bases, the bottoms of the support rods and the telescopic mechanisms are respectively fixedly connected to the corresponding connecting seats, the tops of the two support rods and the two telescopic mechanisms are hinged with the same photovoltaic bracket, the top of the photovoltaic bracket is fixedly installed with a photovoltaic panel, the same adjustment mechanism is provided between the two telescopic mechanisms, the adjustment mechanism is used to detect the wind force and drive the two telescopic mechanisms to extend and retract, the extension and retraction of the two telescopic mechanisms will drive the photovoltaic panel to flip at different angles with the connection between the photovoltaic bracket and the support rod as the center of the circle, a protective mechanism is fixedly installed on the top of the photovoltaic panel, and a shielding mechanism is provided on the protective mechanism. During the flipping of the photovoltaic panel, the shielding mechanism will present different opening angles.

[0006] Preferably, the telescopic mechanism comprises a circular box whose bottom end is fixedly connected to a corresponding connecting seat, a cylinder is slidably installed through the circular box, a connecting block is fixedly installed on the top of the cylinder, the connecting block is connected to the photovoltaic bracket, a slider is fixedly installed on the bottom end of the cylinder, the slider is slidably connected to the inner wall of the circular box, a bevel gear 1 is rotatably installed on the bottom inner wall of the circular box, a screw is fixedly installed on the top of the bevel gear 1, the screw is threadedly connected to the inner wall of the cylinder, and a bevel gear 2 is meshingly connected to the bevel gear 1.

[0007] Preferably, two rotating shafts 1 and two rotating shafts 2 are provided at the bottom of the photovoltaic bracket, and the two rotating shafts 1 and the two rotating shafts 2 are arranged in a rectangular shape. The two rotating shafts 1 respectively penetrate the corresponding rotating shaft 1 and are rotatably connected to the corresponding rotating shaft 1. Sliding holes are provided on the connecting block, and the two rotating shafts 2 respectively penetrate the corresponding sliding holes and are rollingly connected to the inner walls of the corresponding sliding holes.

[0008] Preferably, two symmetrically distributed guide grooves are opened on the side of the slider, two guide rods are fixedly installed on the inner wall of the round box, the two guide rods are slidingly connected to the inner walls of the corresponding guide grooves respectively, and a limit stop ring is fixedly installed on the inner wall of the round box, and the limit stop ring is located above the second bevel gear.

[0009] Preferably, the adjustment mechanism includes an installation box 1, circular tubes are fixedly installed on both sides of the installation box 1, the ends of the two circular tubes away from each other are fixedly connected to the corresponding circular boxes, the two circular boxes are connected to the installation box 1 through the corresponding circular tubes, a plurality of support rings are fixedly installed in the circular tubes, the same transmission shaft is rotatably installed in the plurality of support rings, the ends of the two transmission shafts away from each other are fixedly connected to the corresponding bevel gear 2, a dual-axis motor is fixedly installed in the installation box 1, and the two ends of the output shaft of the dual-axis motor are fixedly connected to the corresponding transmission shafts.

[0010] Preferably, a wind speed meter is fixedly installed on the outside of the installation box 1.

[0011] Preferably, the protection mechanism includes two baffle plates 1 and two baffle plates 2, the two baffle plates 2 are located between the two baffle plates 1 and are fixedly connected to the two baffle plates 1, and an ash discharge pipe is fixedly installed through the baffle plates 1 near the two support rods.

[0012] Preferably, the shielding mechanism includes two horizontal plates 1 fixedly mounted on the tops of two baffle plates 2, a plurality of linearly distributed baffle blades are provided between the two baffle plates 1, circular shafts are fixedly mounted on both ends of the baffle blades, the circular shafts at both ends of the baffle blades respectively rotatably penetrate the corresponding horizontal plates 1, a swing arm is fixedly sleeved on the circular shaft, the same horizontal plate 2 is hinged on the multiple swing arms located on the same side, two rollers are rotatably mounted on the side of the horizontal plate 2 away from the swing arm, the same vertical pole is provided between the two rollers, and the bottom end of the vertical pole is fixedly connected to the corresponding base.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention can control the extension and retraction of two telescopic mechanisms to make the photovoltaic panels present different inclination angles according to the different light angles in four seasons, thereby ensuring that the photovoltaic panels can maintain a vertical state with the sunlight;

[0015] 2. During the flipping process of the photovoltaic panel, the multiple shielding leaves on the shielding mechanism can be flipped synchronously to ensure that the edges of the shielding leaves can remain perpendicular to the sunlight and that the sunlight blocked by the shielding leaves can be ignored;

[0016] 3. When the photovoltaic panel is in a horizontal state and a maximum tilt state, the shielding mechanism is in a completely closed state, thereby ensuring that the shielding mechanism can completely shield the photovoltaic panel. Therefore, in windy weather, shielding the photovoltaic panel through the shielding mechanism can prevent sand and gravel in the wind from contacting the photovoltaic panel, and can avoid the photovoltaic panel being scratched by sand and gravel. In hail weather, the shielding mechanism in the maximum tilt state has a smaller contact area with the hail. In addition, since multiple baffles are in a tilted state, the shielding mechanism can weaken the impact force generated by the hail, and provide certain protection for itself and the photovoltaic panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a photovoltaic assembly installation structure that is easy to flip proposed by the present invention;

[0018] Figure 2 This is a schematic diagram of another structural orientation of a photovoltaic assembly installation structure that is easy to flip proposed by the present invention;

[0019] Figure 3 A schematic diagram of the structure of an adjustment mechanism and two telescopic mechanisms in a photovoltaic assembly installation structure that is easy to flip proposed by the present invention;

[0020] Figure 4 A partial side cross-sectional view of a telescopic mechanism and an adjusting mechanism in a photovoltaic assembly installation structure that is easy to flip proposed by the present invention;

[0021] Figure 5 A schematic diagram of the structure of a shielding mechanism in a photovoltaic assembly installation structure that is easy to flip proposed by the present invention;

[0022] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of part A;

[0023] Figure 7 A side sectional view and a partially enlarged schematic view of a protective mechanism in a photovoltaic assembly installation structure that is easy to flip proposed by the present invention;

[0024] Figure 8 It is a schematic diagram of the structure of multiple baffles when the photovoltaic panel is in a horizontal state;

[0025] Fig. 9 It is a schematic diagram of the structure of multiple baffles when the photovoltaic panel is in the maximum tilt state.

[0026] In the figure: 1. base; 2. connecting seat; 3. support rod; 4. telescopic mechanism; 41. round box; 42. cylinder; 43. slider; 44. screw; 45. bevel gear one; 46. bevel gear two; 47. connecting block; 48. sliding hole; 49. limit ring; 5. photovoltaic panel; 6. photovoltaic bracket; 61. rotating shaft one; 62. rotating shaft two; 7. adjustment mechanism; 71. installation box one; 72. round tube; 73. wind speed meter; 74. dual-axis motor; 75. support ring; 76. transmission shaft; 8. shielding mechanism; 81. horizontal board one; 82. baffle; 83. round shaft; 84. swing arm; 85. horizontal board two; 86. roller; 87. vertical pole; 9. protection mechanism; 91. baffle one; 92. baffle two; 93. ash discharge pipe. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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.

[0028] Please refer to Figure 1-Figure 9 The present invention provides a technical solution: a photovoltaic assembly installation structure that is easy to flip, comprising two bases 1, on which a connecting seat 2 is fixedly installed, a support rod 3 and a telescopic mechanism 4 are arranged above the base 1, the bottoms of the support rod 3 and the telescopic mechanism 4 are respectively fixedly connected to the corresponding connecting seat 2, the tops of the two support rods 3 and the two telescopic mechanisms 4 are hinged with the same photovoltaic bracket 6, the top of the photovoltaic bracket 6 is fixedly installed with a photovoltaic panel 5, the same adjustment mechanism 7 is arranged between the two telescopic mechanisms 4, the adjustment mechanism 7 is used to detect the size of the wind force and drive the two telescopic mechanisms 4 to extend and retract, the extension and retraction of the two telescopic mechanisms 4 will drive the photovoltaic panel 5 to flip at different angles with the connection between the photovoltaic bracket 6 and the support rod 3 as the center of the circle, a protective mechanism 9 is fixedly installed on the top of the photovoltaic panel 5, and a shielding mechanism 8 is arranged on the protective mechanism 9. During the flipping process of the photovoltaic panel 5, the shielding mechanism 8 will present different opening angles.

[0029] The telescopic mechanism 4 includes a round box 41 whose bottom end is fixedly connected to the corresponding connecting seat 2, a cylinder 42 is slidably installed through the round box 41, a connecting block 47 is fixedly installed on the top of the cylinder 42, the connecting block 47 is connected to the photovoltaic bracket 6, a slider 43 is fixedly installed on the bottom end of the cylinder 42, the slider 43 is slidably connected to the inner wall of the round box 41, a bevel gear 45 is rotatably installed on the bottom inner wall of the round box 41, a screw 44 is fixedly installed on the top of the bevel gear 45, the screw 44 is threadedly connected to the inner wall of the cylinder 42, and a bevel gear 2 46 is meshedly connected to the bevel gear 1 45.

[0030] Two rotating shafts 61 and two rotating shafts 62 are provided at the bottom of the photovoltaic bracket 6. The two rotating shafts 61 and the two rotating shafts 62 are arranged in a rectangular shape. The two rotating shafts 61 respectively penetrate the corresponding rotating shaft 61 and are rotatably connected to the corresponding rotating shaft 61. A sliding hole 48 is provided on the connecting block 47. The two rotating shafts 62 respectively penetrate the corresponding sliding hole 48 and are rollingly connected to the inner wall of the corresponding sliding hole 48.

[0031] Furthermore, when the photovoltaic panel 5 rotates with the axes of the two rotating shafts 1 61 as the center, the rotating shaft 2 62 will slide in the sliding hole 48 .

[0032] Two symmetrically distributed guide grooves are provided on the side of the slider 43. Two guide rods are fixedly installed on the inner wall of the round box 41. The two guide rods are slidably connected to the inner walls of the corresponding guide grooves respectively. A limit stop ring 49 is fixedly installed on the inner wall of the round box 41. The limit stop ring 49 is located above the bevel gear 2 46.

[0033] Furthermore, through the cooperation of the guide groove and the guide rod, the slider 43 can only move vertically up and down in the round box 41, ensuring that when the screw 44 rotates, the cylinder 42 can only move up and down, and by setting a limit ring 49, the downward movement of the slider 43 can be limited to ensure that the slider 43 will not contact the bevel gear 46.

[0034] The adjusting mechanism 7 includes an installation box 71, and circular tubes 72 are fixedly installed on both sides of the installation box 71. The ends of the two circular tubes 72 that are away from each other are fixedly connected to the corresponding circular boxes 41 respectively. The two circular boxes 41 are connected to the installation box 71 through the corresponding circular tubes 72 respectively. A plurality of support rings 75 are fixedly installed in the circular tube 72. The same transmission shaft 76 is rotatably installed in the plurality of support rings 75. The ends of the two transmission shafts 76 that are away from each other are fixedly connected to the corresponding bevel gears 46 respectively. A dual-axis motor 74 is fixedly installed in the installation box 71, and the two ends of the output shafts of the dual-axis motor 74 are fixedly connected to the corresponding transmission shafts 76 respectively.

[0035] Furthermore, by controlling the rotation direction of the dual-axis motor 74 , the telescopic mechanism 4 can be extended and retracted.

[0036] A wind speed meter 73 is fixedly installed on the outside of the installation box 71.

[0037] Furthermore, the wind speed meter 73 can detect the wind force directly blowing on the front or back of the photovoltaic panel 5 .

[0038] The protection mechanism 9 includes two baffle plates 1 91 and two baffle plates 2 92 . The two baffle plates 2 92 are located between the two baffle plates 1 91 and are fixedly connected to the two baffle plates 1 91 . A dust discharge pipe 93 is fixedly installed through the baffle plate 1 91 near the two support rods 3 .

[0039] Furthermore, when the photovoltaic panel 5 is in a tilted state, the baffle 91 equipped with the ash discharge pipe 93 is in a lower state. At this time, the dirt that falls on the top of the photovoltaic panel 5 and is not stuck will automatically roll along the tilted photovoltaic panel 5 to the ash discharge pipe 93 and finally be discharged from the ash discharge pipe 93.

[0040] The shielding mechanism 8 includes two horizontal plates 81 fixedly installed on the top of two baffle plates 92, and a plurality of linearly distributed baffle blades 82 are arranged between the two baffle plates 91. Round shafts 83 are fixedly installed at both ends of the baffle blades 82. The round shafts 83 at both ends of the baffle blades 82 respectively rotate through the corresponding horizontal plates 81. Swing arms 84 are fixedly sleeved on the round shafts 83. The same horizontal plate 85 is hinged on the multiple swing arms 84 located on the same side. Two rollers 86 are rotatably installed on the side of the horizontal plate 85 away from the swing arm 84. The same vertical rod 87 is arranged between the two rollers 86, and the bottom end of the vertical rod 87 is fixedly connected to the corresponding base 1.

[0041] In this embodiment: when in use, when it is necessary to adjust the inclination angle of the photovoltaic panel 5, it is only necessary to start the installation box 1 71, and the installation box 1 71 drives the two transmission shafts 76 to rotate, and the transmission shaft 76 then drives the bevel gear 1 45 to rotate through the bevel gear 2 46, and the rotation of the bevel gear 1 45 will drive the screw 44 to rotate. During the rotation of the screw 44, the cylinder 42 will move up and down along the axial direction, and the cylinder 42 will drive the connecting block 47 to move up and down. When the connecting block 47 moves up and down, it will drive the photovoltaic bracket 6 and the two rotating shafts 1 61 to rotate as the center of the circle. The photovoltaic bracket 6 drives the photovoltaic panel 5 to rotate synchronously, so that the photovoltaic panel 5 presents different inclination angles;

[0042] When the photovoltaic panel 5 rotates with the two rotating shafts 1 61 as the center, the positions of the four rollers 86 on the two horizontal plates 2 85 thereon will change. However, due to the obstruction of the two vertical poles 87, the front and rear positions of the two horizontal plates 2 85 will be displaced. The horizontal plates 2 85 then drive the multiple baffles 82 to flip through the multiple swing arms 84, thereby ensuring that when the inclination angle of the photovoltaic panel 5 is adjusted, the inclination angles of the multiple baffles 82 will also change at the same time, and finally ensuring that the sun's irradiation angle is always perpendicular to the edges of the baffles 82. Since the edges of the baffles 82 block very little sunlight, it is ensured that the sunlight can fully irradiate on the photovoltaic panel 5.

[0043] When the wind speed meter 73 detects the occurrence of strong winds, the dual-axis motor 74 can be remotely started to make the two telescopic mechanisms 4 fully retracted. During this process, the two telescopic mechanisms 4 will drive the photovoltaic panel 5 to rotate around the rotating shaft 1 61 and be in a horizontal state. The photovoltaic panel 5 in the horizontal state has a smaller windward surface, so when encountering strong winds, it can avoid the photovoltaic panel 5 being overturned by the strong wind. When encountering hail, the dual-axis motor 74 is remotely started to make the two telescopic mechanisms 4 in a fully extended state, so that the photovoltaic panel 5 is in a maximum tilt state.

[0044] When the photovoltaic panel 5 is in a horizontal state and a maximum tilt state, the ends of the multiple baffles 82 will fit together, so as to completely cover the photovoltaic panel 5. Therefore, in windy weather, the shielding mechanism 8 can shield the photovoltaic panel 5 to prevent sand and gravel in the wind from contacting the photovoltaic panel 5, and avoid the photovoltaic panel 5 being scratched by sand and gravel. In hail weather, the shielding mechanism 8 in the maximum tilt state has a smaller contact area with the hail. In addition, since the multiple baffles 82 are in a tilted state, the shielding mechanism 8 can weaken the impact force generated by the hail, thereby providing certain protection for itself and the photovoltaic panel 5.

[0045] The above description is only a preferred specific implementation manner 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 scheme and inventive concept 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 photovoltaic module installation structure that is easy to flip, comprising two bases (1), characterized in that: A connecting seat (2) is fixedly mounted on each of the two bases (1); a supporting rod (3) and a telescopic mechanism (4) are arranged above the base (1); the bottoms of the supporting rod (3) and the telescopic mechanism (4) are respectively fixedly connected to the corresponding connecting seat (2); the tops of the two supporting rods (3) and the two telescopic mechanisms (4) are hingedly connected with a same photovoltaic bracket (6); a photovoltaic panel (5) is fixedly mounted on the top of the photovoltaic bracket (6); a same adjustment mechanism (7) is arranged between the two telescopic mechanisms (4); the adjustment mechanism (7) is used to detect the wind force and drive the two telescopic mechanisms (4) to telescope; the telescopic movement of the two telescopic mechanisms (4) will drive the photovoltaic panel (5) to flip at different angles with the connection between the photovoltaic bracket (6) and the supporting rod (3) as the center of the circle; a protective mechanism (9) is fixedly mounted on the top of the photovoltaic panel (5); a shielding mechanism (8) is arranged on the protective mechanism (9); during the flipping process of the photovoltaic panel (5), the shielding mechanism (8) will present different opening angles.

2. The photovoltaic assembly installation structure that is easy to flip according to claim 1, characterized in that: The telescopic mechanism (4) comprises a round box (41) whose bottom end is fixedly connected to the corresponding connecting seat (2); a cylinder (42) is slidably installed on the round box (41); a connecting block (47) is fixedly installed on the top of the cylinder (42); the connecting block (47) is connected to the photovoltaic bracket (6); a slider (43) is fixedly installed on the bottom end of the cylinder (42); the slider (43) is slidably connected to the inner wall of the round box (41); a bevel gear 1 (45) is rotatably installed on the inner wall of the bottom of the round box (41); a screw (44) is fixedly installed on the top of the bevel gear 1 (45); the screw (44) is threadedly connected to the inner wall of the cylinder (42); and a bevel gear 2 (46) is meshingly connected to the bevel gear 1 (45).

3. The photovoltaic assembly installation structure that is easy to flip according to claim 2 is characterized in that: The bottom of the photovoltaic bracket (6) is provided with two rotating shafts 1 (61) and two rotating shafts 2 (62), the two rotating shafts 1 (61) and the two rotating shafts 2 (62) are arranged in a rectangular shape, the two rotating shafts 1 (61) respectively penetrate the corresponding rotating shaft 1 (61) and are rotatably connected with the corresponding rotating shaft 1 (61), the connecting block (47) is provided with a sliding hole (48), the two rotating shafts 2 (62) respectively penetrate the corresponding sliding hole (48) and are rollingly connected with the inner wall of the corresponding sliding hole (48).

4. The photovoltaic assembly installation structure that is easy to flip according to claim 2 is characterized in that: The side of the slide block (43) is provided with two symmetrically distributed guide grooves. Two guide rods are fixedly mounted on the inner wall of the round box (41). The two guide rods are respectively slidably connected to the inner walls of the corresponding guide grooves. A limit stop ring (49) is fixedly mounted on the inner wall of the round box (41). The limit stop ring (49) is located above the second bevel gear (46).

5. The photovoltaic assembly installation structure that is easy to flip according to claim 2, characterized in that: The adjustment mechanism (7) comprises an installation box (71), and circular tubes (72) are fixedly installed on both sides of the installation box (71), and the ends of the two circular tubes (72) that are away from each other are respectively fixedly connected to the corresponding circular boxes (41), and the two circular boxes (41) are respectively connected to the installation box (71) through the corresponding circular tubes (72). A plurality of support rings (75) are fixedly installed in the circular tubes (72), and a same transmission shaft (76) is rotatably installed in the plurality of support rings (75), and the ends of the two transmission shafts (76) that are away from each other are respectively fixedly connected to the corresponding bevel gears (46). A dual-axis motor (74) is fixedly installed in the installation box (71), and the two ends of the output shaft of the dual-axis motor (74) are respectively fixedly connected to the corresponding transmission shafts (76).

6. The photovoltaic assembly installation structure that is easy to flip according to claim 5, characterized in that: A wind speed meter (73) is fixedly mounted on the outside of the installation box (71).

7. The photovoltaic assembly installation structure that is easy to flip according to claim 1, characterized in that: The protection mechanism (9) comprises two baffle plates (91) and two baffle plates (92). The two baffle plates (92) are located between the two baffle plates (91) and are fixedly connected to the two baffle plates (91). An ash discharge pipe (93) is fixedly installed through the baffle plate (91) near the two support rods (3).

8. The photovoltaic assembly installation structure that is easy to flip according to claim 7, characterized in that: The shielding mechanism (8) comprises two transverse plates (81) fixedly mounted on the tops of two baffle plates (92); a plurality of linearly distributed baffle blades (82) are arranged between the two baffle plates (91); circular shafts (83) are fixedly mounted on both ends of the baffle blades (82); the circular shafts (83) at both ends of the baffle blades (82) respectively rotatably penetrate the corresponding transverse plates (81); a swing arm (84) is fixedly sleeved on the circular shaft (83); a plurality of swing arms (84) located on the same side are hingedly connected to the same transverse plate (85); two rollers (86) are rotatably mounted on the side of the transverse plate (85) away from the swing arm (84); a vertical rod (87) is arranged between the two rollers (86); the bottom end of the vertical rod (87) is fixedly connected to the corresponding base (1).

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