Restoration device for deteriorated grassland in mountainous region

Abstract

The invention discloses a restoration device for mountain degraded grassland, and belongs to the technical field of grassland restoration, the restoration device comprises a vehicle body, a broadcast sowing mechanism is arranged on the top surface of the vehicle body, a spraying mechanism is arranged on the vehicle body, and a spraying assembly of the spraying mechanism is arranged on the bottom surface of the vehicle body; a water storage assembly of the spraying mechanism is arranged on the top face of the vehicle body, a soil loosening mechanism is arranged on the front side of the vehicle body, and a soil covering mechanism is arranged on the rear side of the vehicle body. The sowing mechanism, the spraying mechanism and the soil loosening mechanism are installed on the vehicle body, soil loosening, seed sowing, watering and other work can be conducted, the grassland repairing efficiency is improved, and the labor intensity of workers is reduced; the multifunctional agricultural machine can also be used for fertilizing and spraying soil amendments, and is diversified in function and high in practicability.

Description

Technical Field

[0001] The present invention relates to the technical field of grassland restoration, and in particular to a restoration device for degraded mountain grassland. Background Art

[0002] Grassland degradation refers to the decline of grassland vegetation. It is primarily manifested by a reduction in high-quality forage species, a deterioration in the quality of various forages, and a decrease in forage yield per unit area. Grassland degradation is a type of land degradation and a major manifestation of desertification. It is the deterioration of grasslands caused by human activities and adverse natural factors, including the loss of soil matter and deterioration of physical and chemical properties, the loss of high-quality forage, and a decline in economic productivity.

[0003] Currently, when restoring grassland, grass seeds need to be spread on the ground manually, and then fertilized and watered. Due to the lack of special equipment, manual labor intensity is high and work efficiency is low. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for repairing degraded mountain grasslands, which solves the problem that during grassland repair, grass seeds need to be manually sprinkled on the ground, and then fertilized and watered, which lacks special equipment, has high labor intensity and low work efficiency.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a restoration device for degraded mountain grassland, comprising a vehicle body, a spreading mechanism provided on the top surface of the vehicle body, a spraying mechanism provided on the vehicle body, a spraying assembly of the spraying mechanism provided on the bottom surface of the vehicle body, a water storage assembly of the spraying mechanism provided on the top surface of the vehicle body, a soil loosening mechanism provided on the front side of the vehicle body, and a soil covering mechanism provided on the rear side of the vehicle body.

[0007] Furthermore, the vehicle body includes a frame, a push rod is provided on the rear side of the frame, a front wheel axle and a rear wheel axle are respectively provided on the front and rear sides below the frame, a front wheel is provided on the front wheel axle, and a rear wheel is provided on the rear wheel axle. The frame is also provided with a driving mechanism for driving the vehicle body to move.

[0008] Furthermore, the driving mechanism includes a first motor, which is arranged on the top surface of the frame. The first motor is connected to the front wheel axle through a first transmission assembly, and the front wheel axle is connected to the rear wheel axle through a second transmission assembly.

[0009] Furthermore, the spreading mechanism includes a hopper, two feed pipes are provided at the bottom of the hopper, a mounting shell is provided at the bottom of the feed pipe, a spreading disc is provided inside the mounting shell, and a driving assembly for driving the spreading disc to rotate is provided below the spreading disc.

[0010] Furthermore, the drive assembly includes a first rotating shaft, which is connected to the spreading disc, a first bevel gear is provided on the first rotating shaft, a second rotating shaft is provided on the frame, a second rotating shaft is provided with a second bevel gear meshing with the first bevel gear, and a second motor is provided on one side of the second rotating shaft for driving the second rotating shaft to rotate.

[0011] Furthermore, a clutch is provided between the two second rotating shafts, and a shift fork rod is provided on one side of the clutch.

[0012] Furthermore, the water storage assembly includes a water tank, which is arranged on the top surface of the frame. A water pump is provided on the top surface of the frame. The water inlet of the water pump is connected to the water tank through a pipeline, and the water outlet of the water pump is connected to the spray assembly through a pipeline.

[0013] Furthermore, a stirring paddle is provided inside the water tank, and a third motor for driving the stirring paddle to rotate is provided on the side of the water tank.

[0014] Furthermore, the spray assembly includes a tee pipe, two of the interfaces of the tee pipe are connected to the spray pipe, and the other interface of the tee pipe is connected to the internal hollow worm gear, and the worm gear is rotatably connected to the bottom surface of the frame, and a rotary joint is installed at the other end of the worm gear, which is connected to the water outlet of the water pump through a pipeline, and one side of the worm gear is meshed with a worm gear, and a fourth motor for driving the worm gear to rotate is provided under the frame.

[0015] Furthermore, the loosening mechanism includes a first bracket, which is arranged on the top surface of the frame, and a first folding plate is provided on the left and right sides of the frame, a first electric push rod is provided between the first folding plate and the first bracket, and a connecting frame is provided below the first folding plate, and a fifth motor is provided on one side of the connecting frame, and a third bevel gear is provided on the output shaft of the fifth motor, and a fourth bevel gear is meshed and connected to one side of the third bevel gear, and a plurality of third rotating shafts are provided on the connecting frame, and gears are provided on the third rotating shafts, and two adjacent gears are meshed with each other, and the fourth bevel gear is provided on one of the third rotating shafts, and a mounting seat is provided at the bottom of the third rotating shaft, and a loosening plate is provided on the bottom surface of the mounting seat.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The present invention has a spreading mechanism, a spraying mechanism and a soil loosening mechanism installed on the vehicle body, which can perform tasks such as soil loosening, seed sowing and watering, thereby improving grassland restoration efficiency and reducing the labor intensity of workers; the present invention can also perform fertilization and spray soil conditioners, and has diverse functions and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a front view of the device for repairing degraded mountain grassland according to the present invention;

[0020] Figure 2 A top view of the vehicle body of the present invention;

[0021] Figure 3 It is a side view of the spreading mechanism of the present invention;

[0022] Figure 4 Schematic diagram of the three-dimensional structure of the spreading mechanism of the present invention;

[0023] Figure 5 Schematic diagram of the three-dimensional structure of the spreading plate of the present invention;

[0024] Figure 6 Schematic diagram of the three-dimensional structure of the water tank of the present invention;

[0025] Figure 7 Schematic diagram of the three-dimensional structure of the stirring paddle of the present invention;

[0026] Figure 8 Schematic diagram of the three-dimensional structure of the spray assembly of the present invention;

[0027] Figure 9 It is a side view of the soil loosening mechanism of the present invention;

[0028] Figure 10 Schematic diagram of the three-dimensional structure of the soil loosening mechanism of the present invention;

[0029] Figure 11 It is a side view of the soil covering mechanism of the present invention;

[0030] Figure 12 It is a schematic diagram of the partial structure of the soil covering mechanism of the present invention.

[0031] Explanation of the accompanying symbols: 1. Vehicle body; 2. Spreading mechanism; 3. Spraying mechanism; 4. Soil loosening mechanism; 5. Soil covering mechanism; 1-1. Vehicle frame; 1-2. Push rod; 1-3. Front wheel axle; 1-4. Front wheel; 1-5. Rear wheel axle; 1-6. Rear wheel; 1-7. First motor; 1-8. First transmission assembly; 1-9. Second transmission assembly; 2-1. Hopper; 2-2. Feed pipe; 2-3. Mounting shell; 2-4. Spreading disc; 2-5. First rotating shaft; 2-6. First bevel gear; 2-7. Second rotating shaft; 2-8. Second bevel gear; 2-9. Second motor; 2-10. Clutch; 2-11. Shift fork lever; 3-1. Water tank; 3-2, third motor; 3-3, stirring paddle; 3-4, water pump; 3-5, fourth motor; 3-6, worm gear; 3-7, worm; 3-8, tee pipe; 3-9, spray pipe; 4-1, first bracket; 4-2, first folding plate; 4-3, first electric push rod; 4-4, connecting frame; 4-5, fifth motor; 4-6, third bevel gear; 4-7, fourth bevel gear; 4-8, third rotating shaft; 4-9, gear; 4-10, mounting seat; 4-10, turning plate; 5-1, second bracket; 5-2, second folding plate; 5-3, second electric push rod; 5-4, covering plate; 5-5, support rod; 5-6, limit plate. DETAILED DESCRIPTION

[0032] like Figure 1-12 As shown, a restoration device for mountain degraded grassland includes a vehicle body 1, a spreading mechanism 2 is installed on the top surface of the vehicle body 1, a spraying mechanism 3 is installed on the vehicle body 1, a spraying assembly of the spraying mechanism 3 is installed on the bottom surface of the vehicle body 1, a water storage assembly of the spraying mechanism 3 is installed on the top surface of the vehicle body 1, a loosening mechanism 4 is installed on the front side of the vehicle body 1, and a covering mechanism 5 is installed on the rear side of the vehicle body 1.

[0033] like Figure 2As shown, the vehicle body 1 includes a frame 1-1, a push rod 1-2 is connected to the rear side of the frame 1-1, and a front wheel axle 1-3 and a rear wheel axle 1-5 are rotatably installed on the front and rear sides below the frame 1-1 respectively, two front wheels 1-4 are installed on the front wheel axle 1-3, and two rear wheels 1-6 are installed on the rear wheel axle 1-5. A driving mechanism for driving the vehicle body 1 to move is also installed on the frame 1-1; the driving mechanism includes a first motor 1-7, which is installed on the top surface of the frame 1-1, and the first motor 1-7 is connected to the front wheel axle 1-3 through a first transmission assembly 1-8. The front wheel axle 1-3 is connected to the rear wheel axle 1-5 through the second transmission assembly 1-9; the first transmission assembly 1-8 and the second transmission assembly 1-9 both adopt a sprocket chain structure. Specifically, the first transmission assembly 1-8 includes a first sprocket and a second sprocket, the first sprocket is installed on the output shaft of the first motor 1-7, and the second sprocket is installed on the front wheel axle 1-3, and the first sprocket and the second sprocket are connected by a first chain transmission; the second transmission assembly 1-9 includes a third sprocket and a fourth sprocket, the third sprocket is installed on the front wheel axle 1-3, and the fourth sprocket is installed on the rear wheel axle 1-5, and the third sprocket and the fourth sprocket are connected by a second chain transmission.

[0034] When in use, the first motor 1-7 is started, and the first motor 1-7 drives the front wheel axle 1-3 to rotate through the first transmission assembly 1-8, thereby driving the front wheel 1-4 to rotate, and the front wheel axle 1-3 drives the rear wheel axle 1-5 to rotate through the second transmission assembly 1-9, thereby driving the rear wheel axle 1-5 to rotate, so that the vehicle body 1 moves forward.

[0035] like Figure 3-5As shown, the spreading mechanism 2 includes a hopper 2-1, which is connected to the top of the frame 1-1 through a mounting frame, and two feeding pipes 2-2 are connected to the bottom of the hopper 2-1, and the bottom of the feeding pipe 2-2 is connected to a mounting shell 2-3, and a spreading disc 2-4 is rotatably mounted inside the mounting shell 2-3, and a sealing door is hinged at the outlet of the mounting shell 2-3, and the sealing door is locked by a latch, and latches are installed on the upper and lower sides of the outlet. When the sealing door is open, it is fixed with the upper latch, and when the sealing door is closed, it is fixed with the lower latch. A driving assembly for driving the spreading disc 2-4 to rotate is provided below the spreading disc 2-4; the driving assembly includes The first rotating shaft 2-5 is connected to the bottom center position of the spreading plate 2-4, and the first rotating shaft 2-5 is rotatably connected to the mounting frame through a bearing. A first bevel gear 2-6 is installed on the first rotating shaft 2-5, and a second rotating shaft 2-7 is rotatably installed on the frame 1-1 through a bearing. A second bevel gear 2-8 meshing with the first bevel gear 2-6 is installed on the second rotating shaft 2-7, and a second motor 2-9 for driving the second rotating shaft 2-7 to rotate is provided on one side of the second rotating shaft 2-7; a clutch 2-10 is installed between the two second rotating shafts 2-7, and a fork rod 2-11 is installed on one side of the clutch 2-10.

[0036] When in use, the clutch 2-10 is controlled by operating the fork lever 2-11 to connect the two second rotating shafts 2-7 together, and the second motor 2-9 works to drive the two second rotating shafts 2-7 to rotate together, and the rotation of the second rotating shaft 2-7 drives the second bevel gear 2-8 to rotate, and the rotation of the second bevel gear 2-8 drives the first bevel gear 2-6 to rotate, and the rotation of the first bevel gear 2-6 drives the first rotating shaft 2-5 to rotate, and the rotation of the first rotating shaft 2-5 drives the sowing disc 2-4 to rotate, thereby sowing grass seeds to both sides of the vehicle body 1; when it is necessary to sow grass seeds to one side, the clutch 2-10 is controlled by operating the fork lever 2-11 to separate the two second rotating shafts 2-7. At this time, the second motor 2-9 can only drive the second rotating shaft 2-7 connected to it to rotate, so that the sowing disc 2-4 on the same side thereof works, and the sealing door at the outlet of the mounting shell 2-3 outside the non-working sowing disc 2-4 is closed.

[0037] like Figure 6 As shown, the water storage assembly includes a water tank 3-1, which is installed on the top surface of the frame 1-1 through a column. A water pump 3-4 is installed on the top surface of the frame 1-1. The water inlet of the water pump 3-4 is connected to the water tank 3-1 through a pipeline, and the water outlet of the water pump 3-4 is connected to the spray assembly through a pipeline.

[0038] like Figure 7As shown, a stirring paddle 3-3 is rotatably installed inside the water tank 3-1 through a bearing, and a third motor 3-2 for driving the stirring paddle 3-3 to rotate is installed on the side of the water tank 3-1. The stirring paddle 3-3 includes a central shaft, which is connected to the output shaft of the third motor 3-2. A stirring blade in a ribbon shape is connected to the outer wall of the central shaft, and the stirring blade is connected to the central shaft through a connecting rod.

[0039] like Figure 8 As shown, the spray assembly includes a three-way pipe 3-8, two of the interfaces of the three-way pipe 3-8 are connected to the spray pipe 3-9, the outer end of the spray pipe 3-9 drives the nozzle, and the other interface of the three-way pipe 3-8 is connected to the internal hollow worm 3-7. The other end of the worm 3-7 is installed with a rotary joint, which is connected to the water outlet of the water pump 3-4 through a pipeline. The specially made worm 3-7 is used as a water pipe, and the worm 3-7 is rotatably connected to the bottom surface of the frame 1-1. One side of the worm 3-7 is engaged with a worm gear 3-6, and a fourth motor 3-5 for driving the worm gear 3-6 to rotate is provided below the frame 1-1.

[0040] When in use, the fourth motor 3-5 drives the worm wheel 3-6 to rotate, the rotation of the worm wheel 3-6 drives the worm 3-7 to rotate, and the worm 3-7 drives the two spraying pipes 3-9 to rotate and spray.

[0041] like Figure 9-10 As shown, the loosening mechanism 4 includes a first bracket 4-1, which is connected to the top surface of the frame 1-1. The first bracket 4-1 is configured as a triangle. The left and right sides of the frame 1-1 are hinged with first folding plates 4-2. A first electric push rod 4-3 is installed between the first folding plate 4-2 and the first bracket 4-1. A connecting frame 4-4 is connected below the first folding plate 4-2. A fifth motor 4-5 is installed on one side of the connecting frame 4-4. A third bevel gear 4-6 is installed on the output shaft of the fifth motor 4-5. , one side of the third bevel gear 4-6 is meshed with the fourth bevel gear 4-7, and a number of third rotating shafts 4-8 are rotatably installed on the connecting frame 4-4 through bearings, and a gear 4-9 is installed on the third rotating shaft 4-8. The gear 4-9 is arranged between the two partitions of the connecting frame 4-4, and the two adjacent gears 4-9 are meshed with each other. The fourth bevel gear 4-7 is installed on one of the third rotating shafts 4-8, and the bottom of the third rotating shaft 4-8 is connected to a mounting seat 4-10, and the bottom surface of the mounting seat 4-10 is connected to two turning plates 4-11.

[0042] When in use, the fifth motor 4-5 drives the third bevel gear 4-6 to rotate, the rotation of the third bevel gear 4-6 drives the fourth bevel gear 4-7 to rotate, the rotation of the fourth bevel gear 4-7 drives the third rotating shaft 4-8 connected thereto to rotate, the rotation of the third rotating shaft 4-8 drives the gear 4-9 thereon to rotate, the gear 4-9 drives other gears 4-9 to rotate through meshing connection, thereby driving other third rotating shafts 4-8 to rotate, and then multiple turning plates 4-11 perform soil loosening work.

[0043] When loosening the soil is not required, the working rod of the first electric push rod 4-3 retracts, driving the first folding plate 4-2 to flip upward to a vertical position; when loosening the soil is required, the working rod of the first electric push rod 4-3 extends, driving the first folding plate 4-2 to rotate to a horizontal position.

[0044] like Figure 11-12 As shown, the covering mechanism 5 includes a second bracket 5-1, which is connected to the top surface of the frame 1-1, and the second bracket 5-1 is arranged in a triangle. Second folding plates 5-2 are hinged on the left and right sides of the frame 1-1, and a second electric push rod 5-3 is installed between the second folding plate 5-2 and the second bracket 5-1. A covering plate 5-4 is hinged under the second folding plate 5-2, and the rear side of the covering plate 5-4 is connected to a support rod 5-5, and a spring is sleeved on the outer side of the support rod 5-5, and the bottom end of the support rod 5-5 is movably connected to the covering plate 5-4, and the second folding plate 5-2 is connected to a limit plate 5-6, and the top end of the support rod 5-5 passes through the through hole of the limit plate 5-6 and is locked by a nut; during use, when the covering plate 5-4 contacts the ground, if it encounters some soil or stones, the bottom of the covering plate 5-4 squeezes the spring upward to make the covering plate 5-4 move, thereby avoiding damage to the covering plate 5-4.

[0045] When covering work is not required, the working rod of the second electric push rod 5-3 is retracted, driving the second folding plate 5-2 to flip upward to a vertical position; when covering work is required, the working rod of the second electric push rod 5-3 is extended, driving the second folding plate 5-2 to rotate to a horizontal position.

[0046] The working process of the present invention is as follows:

[0047] First, the vehicle body 1 moves forward, the loosening mechanism 4 loosens the soil, the spreading mechanism 2 spreads grass seeds to both sides, and the spraying mechanism 3 sprays water to the ground to germinate the grass seeds.

[0048] When it is necessary to spray soil conditioner on the grass, the soil conditioner is added into the water tank 3-1, and the third motor 3-2 drives the stirring paddle 3-3 to stir, mix the soil conditioner and water evenly, and use the spraying assembly to spray evenly on the ground.

[0049] If it is necessary to spread fixed fertilizer on the grass, the fertilizer is put into the hopper 2-1, and the spreading disc 2-4 is rotated to spread the fertilizer on the grass.

[0050] The invention integrates multiple functions into one, and can be used for sowing, fertilizing, watering, spraying soil improver, etc., and is easy to use.

[0051] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A device for repairing degraded grassland in mountainous areas, characterized by: The invention comprises a vehicle body (1), wherein a sowing mechanism (2) is provided on the top surface of the vehicle body (1), a spraying mechanism (3) is provided on the vehicle body (1), a spraying assembly of the spraying mechanism (3) is provided on the bottom surface of the vehicle body (1), a water storage assembly of the spraying mechanism (3) is provided on the top surface of the vehicle body (1), a soil loosening mechanism (4) is provided on the front side of the vehicle body (1), and a soil covering mechanism (5) is provided on the rear side of the vehicle body (1).

2. The device for repairing degraded mountain grassland according to claim 1, characterized in that: The vehicle body (1) comprises a vehicle frame (1-1), a push rod (1-2) is provided on the rear side of the vehicle frame (1-1), a front wheel axle (1-3) and a rear wheel axle (1-5) are provided on the front and rear sides below the vehicle frame (1-1), a front wheel (1-4) is provided on the front wheel axle (1-3), and a rear wheel (1-6) is provided on the rear wheel axle (1-5), and a driving mechanism for driving the vehicle body (1) to move is also provided on the vehicle frame (1-1).

3. The device for repairing degraded mountain grassland according to claim 2, characterized in that: The driving mechanism comprises a first motor (1-7), the first motor (1-7) being arranged on the top surface of the vehicle frame (1-1), the first motor (1-7) being connected to the front wheel axle (1-3) via a first transmission assembly (1-8), and the front wheel axle (1-3) being connected to the rear wheel axle (1-5) via a second transmission assembly (1-9).

4. The device for repairing degraded mountain grassland according to claim 2, characterized in that: The spreading mechanism (2) comprises a hopper (2-1), two conveying pipes (2-2) are provided at the bottom of the hopper (2-1), a mounting shell (2-3) is provided at the bottom of the conveying pipes (2-2), a spreading disc (2-4) is provided inside the mounting shell (2-3), and a driving assembly for driving the spreading disc (2-4) to rotate is provided below the spreading disc (2-4).

5. The device for repairing degraded mountain grassland according to claim 4, characterized in that: The driving assembly comprises a first rotating shaft (2-5), the first rotating shaft (2-5) being connected to the spreading disc (2-4), a first bevel gear (2-6) being provided on the first rotating shaft (2-5), a second rotating shaft (2-7) being provided on the vehicle frame (1-1), a second bevel gear (2-8) being provided on the second rotating shaft (2-7) and being meshed with the first bevel gear (2-6), and a second motor (2-9) for driving the second rotating shaft (2-7) to rotate being provided on one side of the second rotating shaft (2-7).

6. The device for repairing degraded mountain grassland according to claim 5, characterized in that: A clutch (2-10) is provided between the two second rotating shafts (2-7), and a shift fork rod (2-11) is provided on one side of the clutch (2-10).

7. The device for repairing degraded mountain grassland according to claim 2, characterized in that: The water storage assembly comprises a water tank (3-1), the water tank (3-1) being arranged on the top surface of the vehicle frame (1-1), a water pump (3-4) being arranged on the top surface of the vehicle frame (1-1), a water inlet of the water pump (3-4) being connected to the water tank (3-1) via a pipeline, and a water outlet of the water pump (3-4) being connected to the spray assembly via a pipeline.

8. The device for repairing degraded mountain grassland according to claim 7, characterized in that: A stirring paddle (3-3) is provided inside the water tank (3-1), and a third motor (3-2) for driving the stirring paddle (3-3) to rotate is provided on the side of the water tank (3-1).

9. The device for repairing degraded mountain grassland according to claim 7, characterized in that: The spray assembly comprises a three-way pipe (3-8), two interfaces of the three-way pipe (3-8) are connected to a spray pipe (3-9), the other interface of the three-way pipe (3-8) is communicated with an internal hollow worm (3-7), the worm (3-7) is rotatably connected to the bottom surface of the vehicle frame (1-1), a rotary joint is installed at the other end of the worm (3-7), and the rotary joint is communicated with the water outlet of the water pump (3-4) through a pipeline, one side of the worm (3-7) is meshedly connected to a worm gear (3-6), and a fourth motor (3-5) for driving the worm gear (3-6) to rotate is provided below the vehicle frame (1-1).

10. The device for repairing degraded mountain grassland according to claim 2, characterized in that: The loosening mechanism (4) comprises a first bracket (4-1), the first bracket (4-1) being arranged on the top surface of the vehicle frame (1-1), first folding plates (4-2) being arranged on the left and right sides of the vehicle frame (1-1), a first electric push rod (4-3) being arranged between the first folding plate (4-2) and the first bracket (4-1), a connecting frame (4-4) being arranged below the first folding plate (4-2), a fifth motor (4-5) being arranged on one side of the connecting frame (4-4), and a third cone drive being arranged on the output shaft of the fifth motor (4-5). A gear (4-6) is provided, one side of the third bevel gear (4-6) is meshedly connected with a fourth bevel gear (4-7), a plurality of third rotating shafts (4-8) are provided on the connecting frame (4-4), a gear (4-9) is provided on the third rotating shaft (4-8), two adjacent gears (4-9) are meshed with each other, the fourth bevel gear (4-7) is provided on one of the third rotating shafts (4-8), a mounting seat (4-10) is provided at the bottom of the third rotating shaft (4-8), and a turning plate (4-11) is provided on the bottom surface of the mounting seat (4-10).

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