Photovoltaic power generation device for water conservancy and hydropower

Abstract

The application discloses a kind of photovoltaic power generation devices for water conservancy and hydropower, it relates to the technical field of solar power generation equipment, it includes base, mounting frame installed in the top of base, photovoltaic board installed in the top of mounting frame, electrical cabinet installed in one side of mounting frame and solar controller, battery and inverter installed in electrical cabinet, the bottom of the mounting frame is fixedly connected with rotating plate, the bottom of the base is installed with driving motor, the output shaft of the driving motor is vertically upwards and is fixedly connected with the bottom of rotating plate penetrating base, a wireless radio remote control module is installed in the electrical cabinet, and the wireless radio remote control module is electrically connected with the driving motor to control the opening and closing of the driving motor.The application can improve power generation efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar power generation equipment, and particularly relates to a photovoltaic power generation device for water conservancy and hydropower. BACKGROUND

[0002] At present, photovoltaic power generation is a technology for directly converting solar energy into electric energy by using the photovoltaic effect of semiconductor materials, and a photovoltaic cell is a core component thereof. Since the first practical silicon-based photovoltaic cell was developed by Bell Laboratories in the United States in 1954, photovoltaic technology has undergone a leap from space application to ground power station.

[0003] The photovoltaic power generation device for water conservancy and hydropower in the related art generally comprises a base, a mounting frame mounted on the top of the base, a photovoltaic panel mounted on the top of the mounting frame, an electrical cabinet mounted on one side of the mounting frame, and a solar controller, a storage battery and an inverter mounted in the electrical cabinet.

[0004] However, the photovoltaic panel in the prior art is generally fixed, and the sun rises in the east and sets in the west, so that the reception of sunlight is affected, thereby affecting the power generation efficiency. SUMMARY

[0005] The present application provides a photovoltaic power generation device for water conservancy and hydropower, which can improve the power generation efficiency, and adopts the following technical scheme:

[0006] The photovoltaic power generation device for water conservancy and hydropower comprises a base, a mounting frame mounted on the top of the base, a photovoltaic panel mounted on the top of the mounting frame, an electrical cabinet mounted on one side of the mounting frame, and a solar controller, a storage battery and an inverter mounted in the electrical cabinet, the bottom of the mounting frame is fixedly connected with a rotating plate, the bottom of the base is provided with a driving motor, and the output shaft of the driving motor is fixedly connected with the bottom of the rotating plate in a vertical upward penetrating manner.

[0007] Preferably, a flushing mechanism for cleaning the surface of the photovoltaic panel is mounted on the top of the electrical cabinet.

[0008] Preferably, the flushing mechanism comprises a rainwater tank mounted on the top of the electrical cabinet and a flushing pipe communicated with the bottom of the rainwater tank; the end of the flushing pipe away from the rainwater tank is arranged towards the surface of the photovoltaic panel; the top of the rainwater tank is fixedly connected with a water guide frame, the inner wall of the rainwater tank is fixedly connected with a first filter plate and a fixed plate, the fixed plate is provided with a first through hole, the first through hole is slidably connected with a water stop elastic plate, the bottom of the fixed plate is fixedly connected with a plurality of supporting plates, each supporting plate is fixedly connected with a supporting spring between the water stop elastic plate, the bottom of the rainwater tank is provided with a second through hole, the second through hole is fixedly connected with a sealing ring, the sealing ring is slidably connected with a connecting rod, the top of the connecting rod is fixedly connected with the bottom of the water stop elastic plate, the bottom of the connecting rod is fixedly connected with a bearing plate, the inner wall of the electrical cabinet is fixedly connected with an electric push rod, the output end of the electric push rod is fixedly connected with a push plate, and the push plate can drive the bearing plate to move downward.

[0009] Preferably, the side wall of the mounting frame is provided with a scraping mechanism for scraping the surface of the photovoltaic panel.

[0010] Preferably, the scraping mechanism comprises a first lead screw rotatably mounted on the side wall of the mounting frame and a first guide rod fixedly connected with the side wall of the mounting frame; a servo motor is mounted in the electrical cabinet, one end of the first lead screw is fixedly connected with the output shaft of the servo motor, a moving frame is threadedly connected with the first lead screw, the moving frame is slidably connected with the first guide rod, a moving rod is vertically slidably connected with the top of the moving frame, a scraper and a horizontal plate are respectively fixedly connected with the two ends of the moving rod, the side wall of the scraper is provided with an inclined surface, so that the bottom of the scraper forms an edge; the bottom of the horizontal plate is fixedly connected with a first vertical spring, and one end of the first vertical spring away from the horizontal plate is fixedly connected with the top of the moving frame.

[0011] Preferably, the side wall of the mounting frame is fixedly connected with a driving block, and the inclined surface is matched with the side wall of the driving block.

[0012] Preferably, the side wall of the electrical cabinet is provided with a third through hole and a fourth through hole, a second filter plate is mounted in the third through hole, and a cooling fan is mounted in the fourth through hole; a back flushing mechanism for back flushing the second filter plate is mounted in the electrical cabinet.

[0013] Preferably, the backflushing mechanism comprises a backflushing frame installed on the inner wall of the electrical cabinet, a sleeve fixed to the bottom of the backflushing frame, a vertical rod slidingly connected to the sleeve in the vertical direction, a piston plate fixed to the bottom of the vertical rod, and a horizontal plate fixed to the top of the vertical rod; the sleeve is provided with a pressure relief valve, and the piston plate is sealingly slidingly connected to the inner wall of the sleeve, so that a strong air pressure is formed between the piston plate and the pressure relief valve; the bottom of the sleeve is fixed with a horn pipe, and the end of the horn pipe away from the sleeve is arranged towards the second filter plate; the horizontal plate is fixed with a plurality of second vertical springs between the backflushing frame.

[0014] Preferably, the electrical cabinet is provided with a dusting mechanism for dusting the bottom of the second filter plate.

[0015] Preferably, the dusting mechanism comprises a second lead screw rotatingly connected to the bottom of the electrical cabinet and a second guide rod fixed to the bottom of the electrical cabinet; the second lead screw is threadedly connected with a cleaning plate, the cleaning plate is slidingly connected to the second guide rod, the top of the cleaning plate is fixed with a brush, the brush can dust the bottom of the second filter plate; one end of the second lead screw is fixed with a gear, the bottom of the bearing plate is fixed with a rack, the bottom of the electrical cabinet is provided with a fifth through hole for sliding of the rack, and the gear is engaged with the rack.

[0016] In summary, the present application has the following beneficial effects: when it is necessary to adjust the facing direction of the photovoltaic panel, the wireless remote control module is first remotely started to drive the motor, and then the output shaft of the motor drives the rotating plate to rotate, and the rotating plate rotating can adjust the facing direction of the photovoltaic panel, thereby improving the power generation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of the structure of the scraping mechanism highlighted in the embodiment of the present application.

[0019] Figure 3 It is a schematic diagram of the structure of the flushing mechanism highlighted in the embodiment of the present application.

[0020] Figure 4 It is a schematic diagram of the structure of the backflushing mechanism and the dusting mechanism highlighted in the embodiment of the present application.

[0021] Explanation of reference signs: 1, base; 11, driving motor; 2, mounting frame; 21, photovoltaic panel; 22, electrical cabinet; 221, third through hole; 222, second filter plate; 223, fourth through hole; 224, cooling fan; 23, solar controller; 24, storage battery; 25, inverter; 26, rotating plate; 27, wireless remote control module; 3, flushing mechanism; 31, rainwater tank; 311, water guide frame; 312, second through hole; 313, sealing ring; 32, flushing pipe; 33, first filter plate; 34, fixed plate; 341, support plate; 342, first through hole; 343, water-stopping elastic plate; 344, support spring; 35, connecting rod; 36, bearing plate; 37, electric push rod; 38, push plate; 4, scraping mechanism; 41, first lead screw; 42, first guide rod; 43, servo motor; 44, moving frame; 45, moving rod; 46, scraper; 461, inclined surface; 47, cross plate; 48, first vertical spring; 49, driving block; 5, back flushing mechanism; 51, back flushing frame; 52, sleeve; 53, vertical rod; 54, piston plate; 55, horizontal plate; 56, pressure relief valve; 57, horn pipe; 58, second vertical spring; 6, dust brushing mechanism; 61, second lead screw; 62, second guide rod; 63, cleaning plate; 64, brush; 65, gear; 66, rack; 67, fifth through hole. DETAILED DESCRIPTION

[0022] Wherein the same parts are denoted by the same reference signs. It should be noted that the words "front", "back", "left", "right", "upper", "lower", "bottom surface" and "top surface" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a particular component.

[0023] The present application discloses a photovoltaic power generation device for water conservancy and hydropower, as shown in Figure 1 and Figure 2 shown, comprising a base 1, a mounting frame 2 mounted on the top of the base 1, a photovoltaic panel 21 obliquely mounted on the top of the mounting frame 2, an electrical cabinet 22 mounted on one side of the mounting frame 2, and a solar controller 23, a storage battery 24 and an inverter 25 mounted in the electrical cabinet 22, the bottom of the mounting frame 2 is fixedly connected with a rotating plate 26, the bottom of the base 1 is provided with a driving motor 11, the output shaft of the driving motor 11 is vertically upwardly penetrating through the base 1 and fixedly connected with the bottom of the rotating plate 26; the electrical cabinet 22 is provided with a wireless remote control module 27, the wireless remote control module 27 is electrically connected with the driving motor 11, so as to control the opening and closing of the driving motor 11. When it is necessary to adjust the facing direction of the photovoltaic panel 21, the driving motor 11 is first started remotely through the wireless remote control module 27, then the output shaft of the driving motor 11 drives the rotating plate 26 to rotate, and the rotating of the rotating plate 26 can adjust the facing direction of the photovoltaic panel 21, so as to improve the power generation efficiency.

[0024] As Figure 2 And Figure 3 As shown in the figure, the top of the electrical cabinet 22 is provided with a washing mechanism 3 for cleaning the surface of the photovoltaic panel 21, the washing mechanism 3 comprises a rainwater tank 31 vertically installed on the top of the electrical cabinet 22 and a washing pipe 32 communicated with the bottom of the rainwater tank 31; the end of the washing pipe 32 away from the rainwater tank 31 is arranged towards the surface of the photovoltaic panel 21; the top of the rainwater tank 31 is fixedly connected with a water guide frame 311, the opening of the water guide frame 311 is outwardly flared, the inner wall of the rainwater tank 31 is horizontally fixedly connected with a first filter plate 33 and a fixed plate 34, the fixed plate 34 is provided with a first through hole 342, the first through hole 342 is vertically slidably connected with a water-stopping elastic plate 343, the bottom of the fixed plate 34 is horizontally fixedly connected with a plurality of supporting plates 341, each supporting plate 341 is vertically fixedly connected with a supporting spring 344 between the water-stopping elastic plate 343, the bottom of the rainwater tank 31 is provided with a second through hole 312, the second through hole 312 is fixedly connected with a sealing ring 313, the sealing ring 313 is vertically slidably connected with a connecting rod 35, the top of the connecting rod 35 is fixedly connected with the bottom of the water-stopping elastic plate 343, the bottom of the connecting rod 35 is fixedly connected with a bearing plate 36, the inner wall of the electrical cabinet 22 is vertically fixedly connected with an electric push rod 37, the output end of the electric push rod 37 is fixedly connected with a push plate 38, the push plate 38 can drive the bearing plate 36 to move downward. When a large amount of rainwater is accumulated between the water-stopping elastic plate 343 and the filter plate, first start the electric push rod 37, then the output end of the electric push rod 37 drives the push plate 38 to move downward, the push plate 38 drives the bearing plate 36 to move downward, the bearing plate 36 drives the connecting rod 35 to move downward, the connecting rod 35 drives the water-stopping elastic plate 343 to move downward, the water-stopping elastic plate 343 moving downward can make the water flow quickly from the first through hole 342 to the washing pipe 32, then the surface of the photovoltaic panel 21 can be washed more strongly, thereby facilitating the cleaning of the surface of the photovoltaic panel 21; in summary, the washing mechanism 3 is arranged to facilitate the effective washing of the surface of the photovoltaic panel 21.

[0025] As Figure 1 And Figure 2As shown, the side wall of the mounting frame 2 is provided with a scraping mechanism 4 for scraping the surface of the photovoltaic panel 21, the scraping mechanism 4 comprises a first lead screw 41 rotatably mounted on the side wall of the mounting frame 2 through a bearing and a first guide rod 42 fixed to the side wall of the mounting frame 2; a servo motor 43 is mounted in the electrical cabinet 22, one end of the first lead screw 41 is fixed to the output shaft of the servo motor 43, a moving frame 44 is threadedly connected to the first lead screw 41, the first guide rod 42 penetrates through the moving frame 44, the moving frame 44 is slidingly connected to the first guide rod 42, a moving rod 45 is slidingly connected to the top of the moving frame 44 in the vertical direction, the moving rod 45 penetrates through the top of the moving frame 44, the moving rod 45 is fixed with a scraper 46 and a horizontal plate 47 at two ends respectively, the side wall of the scraper 46 is provided with an inclined surface 461, so that the bottom of the scraper 46 forms an edge, which facilitates effective scraping of the surface of the photovoltaic panel 21; the bottom of the horizontal plate 47 is fixed with a first vertical spring 48, one end of the first vertical spring 48 away from the horizontal plate 47 is fixed to the top of the moving frame 44. When it is necessary to clean the adhesives on the surface of the photovoltaic panel 21, the servo motor 43 is started first, at this time the output shaft of the servo motor 43 drives the first lead screw 41 to rotate, the first lead screw 41 drives the moving frame 44 to move, and the moving frame 44 drives the scraper 46 to move, so that the adhesives on the surface of the photovoltaic panel 21 can be cleaned; in summary, the scraping mechanism 4 is provided, which facilitates cleaning of the adhesives on the surface of the photovoltaic panel 21. In addition, the first vertical spring 48 is provided, when the height of the adhesives on the surface of the photovoltaic panel 21 is high, the scraper 46 can be driven to move upward under the action of the inclined surface 461, thereby reducing the damage of the scraper 46.

[0026] As shown in Figure 1 and Figure 2 A camera (not shown in the figure) is mounted on the mounting frame 2, the camera is electrically connected with the wireless radio remote control module 27, the side wall of the mounting frame 2 is vertically fixed with a driving block 49, the width and length of the driving block 49 are much smaller than the width and length of the photovoltaic panel 21, and the inclined surface 461 matches the side wall of the driving block 49. When the scraper 46 blocks the rainwater on the photovoltaic panel 21 from flowing downward, the scraper 46 is continuously driven to move downward by the first lead screw 41, at this time the driving block 49 can drive the scraper 46 to separate from the surface of the photovoltaic panel 21 under the action of the inclined surface 461, which can reduce the blockage of the rainwater.

[0027] As shown in Figure 2 and Figure 3As shown, the side wall of the electrical cabinet 22 is provided with a third through hole 221 and a fourth through hole 223, the second filter plate 222 is installed in the third through hole 221, and the cooling fan 224 is installed in the fourth through hole 223; the backflushing mechanism 5 for backflushing the second filter plate 222 is installed in the electrical cabinet 22. The cooling fan 224 is arranged to facilitate cooling of the electrical cabinet 22; the second filter plate 222 is arranged to reduce the entry of sundries into the electrical cabinet 22; and the backflushing mechanism 5 is arranged to facilitate cleaning of the second filter plate 222.

[0028] As shown in Figure 3 and Figure 4 The backflushing mechanism 5 includes a backflushing frame 51 installed on the inner wall of the electrical cabinet 22, a sleeve 52 vertically fixed to the bottom of the backflushing frame 51, a vertical rod 53 vertically slidingly connected in the sleeve 52, a piston plate 54 fixed to the bottom of the vertical rod 53, and a horizontal plate 55 horizontally fixed to the top of the vertical rod 53; the sleeve 52 is provided with a pressure relief valve 56, and the piston plate 54 is sealingly slidingly connected to the inner wall of the sleeve 52, so that a strong air pressure is formed between the piston plate 54 and the pressure relief valve 56, which can push open the pressure relief valve 56; the bottom of the sleeve 52 is fixed with a horn pipe 57, one end of the horn pipe 57 away from the sleeve 52 is arranged towards the second filter plate 222; the horizontal plate 55 is vertically fixed between the backflushing frame 51 and the horizontal plate 55 by a plurality of second vertical springs 58. The downward movement of the bearing plate 36 drives the downward movement of the horizontal plate 55, the downward movement of the horizontal plate 55 drives the downward movement of the vertical rod 53, the downward movement of the vertical rod 53 drives the downward movement of the piston plate 54, and the downward movement of the piston plate 54 can form a strong air pressure between the piston plate 54 and the pressure relief valve 56, then push open the pressure relief valve 56, and then backflush the second filter plate 222 under the action of the horn pipe 57; in summary, the backflushing mechanism 5 is arranged to facilitate backflushing of the second filter plate 222.

[0029] As shown in Figure 3 and Figure 4As shown, the electrical cabinet 22 is provided with a soot blowing mechanism 6 for soot blowing the bottom of the second filter plate 222, the soot blowing mechanism 6 comprises a second lead screw 61 horizontally rotatably connected to the bottom of the electrical cabinet 22 through a bearing and a second guide rod 62 horizontally fixed to the bottom of the electrical cabinet 22; the second lead screw 61 is threadedly connected with a cleaning plate 63, the cleaning plate 63 is slidingly connected to the second guide rod 62, the second guide rod 62 penetrates through the cleaning plate 63, the top of the cleaning plate 63 is fixed with a brush 64, the brush 64 can soot blow the bottom of the second filter plate 222; one end of the second lead screw 61 is fixed with a gear 65, the bottom of the bearing plate 36 is fixed with a rack 66, the bottom of the electrical cabinet 22 is provided with a fifth through hole 67 for the rack 66 to slide vertically, the gear 65 is engaged with the rack 66. The bearing plate 36 drives the rack 66 to move when moving, the rack 66 drives the gear 65 to rotate when moving, the gear 65 drives the second lead screw 61 to rotate when rotating, the second lead screw 61 drives the cleaning plate 63 to move when rotating, the cleaning plate 63 drives the brush 64 to move when moving, the brush 64 can soot blow the bottom of the second filter plate 222 when moving; in summary, the soot blowing mechanism 6 is convenient for soot blowing the bottom of the second filter plate 222.

[0030] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: equivalent changes made on the structure, shape, principle of the present application should be covered into the protection scope of the present application.

Claims

1. A photovoltaic power generation device for water conservancy and hydropower, comprising a base (1), a mounting frame (2) mounted on the top of the base (1), a photovoltaic panel (21) mounted on the top of the mounting frame (2), an electrical cabinet (22) mounted on one side of the mounting frame (2), and a solar controller (23), a storage battery (24) and an inverter (25) installed in the electrical cabinet (22), characterized in that: The bottom of the mounting frame (2) is fixedly connected with a rotating plate (26), the bottom of the base (1) is provided with a driving motor (11), the output shaft of the driving motor (11) is fixedly connected with the bottom of the rotating plate (26) vertically upward through the base (1), a radio remote control module (27) is installed in the electrical cabinet (22), and the radio remote control module (27) is electrically connected with the driving motor (11) to control the opening and closing of the driving motor (11); The top of the electrical cabinet (22) is provided with a flushing mechanism (3) for cleaning the surface of the photovoltaic panel (21); The flushing mechanism (3) comprises a rainwater tank (31) installed on the top of the electrical cabinet (22) and a flushing pipe (32) communicated with the bottom of the rainwater tank (31); one end of the flushing pipe (32) away from the rainwater tank (31) is arranged towards the surface of the photovoltaic panel (21); the top of the rainwater tank (31) is fixedly connected with a water guide frame (311), the inner wall of the rainwater tank (31) is fixedly connected with a first filter plate (33) and a fixed plate (34), the fixed plate (34) is provided with a first through hole (342), the first through hole (342) is slidably connected with a water stop elastic plate (343), the bottom of the fixed plate (34) is fixedly connected with a plurality of supporting plates (341), a supporting spring (344) is fixedly connected between each supporting plate (341) and the water stop elastic plate (343), the bottom of the rainwater tank (31) is provided with a second through hole (312), the second through hole (312) is fixedly connected with a sealing ring (313), the sealing ring (313) is slidably connected with a connecting rod (35), the top of the connecting rod (35) is fixedly connected to the bottom of the water stop elastic plate (343), the bottom of the connecting rod (35) is fixedly connected with a bearing plate (36), the inner wall of the electrical cabinet (22) is fixedly connected with an electric push rod (37), the output end of the electric push rod (37) is fixedly connected with a push plate (38), and the push plate (38) can push the bearing plate (36) to move downward.

2. The photovoltaic power generation device for water conservancy and hydropower according to claim 1, characterized in that: The side wall of the mounting frame (2) is provided with a scraping mechanism (4) for scraping the surface of the photovoltaic panel (21).

3. The photovoltaic power generation device for water conservancy and hydropower according to claim 2, characterized in that: The scraping mechanism (4) comprises a first lead screw (41) rotatably installed on the side wall of the mounting rack (2) and a first guide rod (42) fixed to the side wall of the mounting rack (2); a servo motor (43) is installed in the electrical cabinet (22), one end of the first lead screw (41) is fixedly connected with the output shaft of the servo motor (43), a moving frame (44) is threadedly connected on the first lead screw (41), the moving frame (44) is slidably connected to the first guide rod (42), a moving rod (45) is slidably connected to the top of the moving frame (44) in the vertical direction, two ends of the moving rod (45) are fixedly connected with a scraper (46) and a horizontal plate (47) respectively, the side wall of the scraper (46) is provided with an inclined surface (461), so that the bottom of the scraper (46) forms an edge; the bottom of the horizontal plate (47) is fixedly connected with a first vertical spring (48), one end of the first vertical spring (48) away from the horizontal plate (47) is fixedly connected to the top of the moving frame (44).

4. The photovoltaic power generation device for water conservancy and hydropower according to claim 3, characterized in that: The side wall of the mounting rack (2) is fixedly connected with a driving block (49), and the inclined surface (461) is matched with the side wall of the driving block (49).

5. The photovoltaic power generation device for water conservancy and hydropower according to claim 1, characterized in that: The side wall of the electrical cabinet (22) is provided with a third through hole (221) and a fourth through hole (223), a second filter plate (222) is installed in the third through hole (221), and a cooling fan (224) is installed in the fourth through hole (223); a backflushing mechanism (5) for backflushing the second filter plate (222) is installed in the electrical cabinet (22).

6. The photovoltaic power generation device for water conservancy and hydropower according to claim 5, characterized in that: The backflushing mechanism (5) comprises a backflushing frame (51) installed on the inner wall of the electrical cabinet (22), a sleeve (52) fixedly connected to the bottom of the backflushing frame (51), a vertical rod (53) slidably connected in the vertical direction in the sleeve (52), a piston plate (54) fixedly connected to the bottom of the vertical rod (53), and a horizontal plate (55) fixedly connected to the top of the vertical rod (53); a pressure relief valve (56) is installed in the sleeve (52), the piston plate (54) is sealingly and slidably connected to the inner wall of the sleeve (52), so that a strong air pressure is formed between the piston plate (54) and the pressure relief valve (56); the bottom of the sleeve (52) is fixedly connected with a horn pipe (57), one end of the horn pipe (57) away from the sleeve (52) is arranged towards the second filter plate (222); the load-bearing plate (36) can drive the horizontal plate (55) to move downward, a plurality of second vertical springs (58) are fixedly connected between the horizontal plate (55) and the backflushing frame (51).

7. The photovoltaic power generation device for water conservancy and hydropower according to claim 1, characterized in that: A dust brushing mechanism (6) for brushing the bottom of the second filter plate (222) is installed on the electrical cabinet (22).

8. The photovoltaic power generation device for water conservancy and hydropower according to claim 7, characterized in that: The ash brushing mechanism (6) comprises a second lead screw (61) rotatably connected to the bottom of the electrical cabinet (22) and a second guide rod (62) fixed to the bottom of the electrical cabinet (22); the second lead screw (61) is threadedly connected with a cleaning plate (63), the cleaning plate (63) is slidably connected to the second guide rod (62), the top of the cleaning plate (63) is fixed with a brush (64), and the brush (64) can brush the bottom of the second filter plate (222); one end of the second lead screw (61) is fixed with a gear (65), the bottom of the bearing plate (36) is fixed with a rack (66), the bottom of the electrical cabinet (22) is provided with a fifth through hole (67) for sliding of the rack (66), and the gear (65) is engaged with the rack (66).

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