Tobacco stem pulling, soil removing and collecting all-in-one machine with adjustable double-row spacing

Abstract

The invention discloses a double-row spacing adjustable tobacco stem pulling, soil removing and collecting all-in-one machine, and particularly relates to the technical field of tobacco stem pulling machines, the double-row spacing adjustable tobacco stem pulling, soil removing and collecting all-in-one machine comprises a tobacco stem pulling machine collecting box, a plurality of machine wheels are installed at the bottom of the tobacco stem pulling machine collecting box, and a double-row spacing adjusting mechanism is arranged on one side of the tobacco stem pulling machine collecting box; a soil turning mechanism is arranged on the other side of the tobacco stem pulling machine collecting box. By arranging the double-row spacing adjusting mechanism and the pulling rod mechanism, rapid and accurate spacing adjustment can be achieved, double-row pulling rods are adjusted to the proper spacing when facing tobacco fields with different row spacings, operation delay caused by mismatching of the row spacings is reduced, various special devices do not need to be prepared for the tobacco fields with different row spacings, the operation efficiency is improved, and the labor intensity of workers is reduced. Residual rhizomes in soil are automatically turned out, the rhizomes are convenient to clean, the situation that the rhizomes are subjected to plant diseases and insect pests due to large residual rhizomes after tobacco stems are pulled out is avoided, continuous planting on land is facilitated, double-row pulling operation can be achieved, and the harvesting efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco rod pulling machines, and more specifically to a tobacco rod pulling, soil removal and collection integrated machine with double-row adjustable spacing. Background Art

[0002] In the field of tobacco cultivation, the diversity of planting row spacing is a common phenomenon. Different tobacco growing areas often have different row spacings due to differences in geographical environment, climate conditions, soil characteristics, local planting traditions and technical levels. For example, in some plains, where the land is relatively fertile and flat, wider row spacings may be used to allow tobacco plants to fully receive light and ventilation, and the row spacing may reach 14,000 mm or even wider; in some mountainous areas or areas with relatively tight land resources, in order to improve land utilization, the row spacing may be relatively narrow, about 12,000 mm; even in the same area, different growers may choose different row spacings due to personal planting habits and land planning. Some growers may pay more attention to the quality of tobacco and use larger row spacings to ensure the growth space and nutrient supply of the plants; while some growers may choose relatively small row spacings for planting due to economic costs or land resources. With the development of the times, tobacco planting can be basically mechanized, but due to the special requirements of tobacco leaves, the tobacco leaf picking process still relies on manual labor, and the efficient mechanized removal and collection of tobacco stems is also a current technical difficulty.

[0003] Most traditional tobacco stalk pulling equipment adopts the design of single-row pulling and chain-type stalk pulling, and the operation efficiency is low. After the tobacco stalks are pulled out, large rhizomes remain, which will cause diseases and pests and is not conducive to continuous planting. At the same time, only single-row pulling operation can be performed, and the harvesting efficiency is low. In the later stage, a large amount of manpower is still required for manual soil removal and collection, which increases the workload and cost of subsequent manual cleaning. In addition, some double-row stalk pulling equipment is not convenient to adjust according to the planting spacing, and its applicability is reduced. Therefore, a double-ridge stalk pulling machine with collection and soil removal functions is proposed. Summary of the invention

[0004] In order to overcome the above defects of the prior art, the present invention provides a double-row spacing adjustable tobacco rod pulling, soil removal and collection integrated machine to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a double-row spacing adjustable tobacco rod pulling and soil removal and collection integrated machine, comprising a tobacco rod pulling machine collection box, a plurality of machine wheels are installed at the bottom of the tobacco rod pulling machine collection box, a double-row spacing adjustment mechanism is arranged on one side of the tobacco rod pulling machine collection box, and a soil turning mechanism is arranged on the other side of the tobacco rod pulling machine collection box;

[0006] The double-row spacing adjustment mechanism includes two fixed plates, and the two fixed plates are fixed on one side of the tobacco rod pulling machine collection box. A first motor is fixedly installed on one side of the fixed plate, and a threaded rod is fixedly connected to the output end of the first motor. A threaded sleeve is threadedly connected to the outer side of the threaded rod, and a connecting plate is fixedly connected to one side of the threaded sleeve. A connecting vertical plate is fixedly connected to one side of the connecting plate, and one end of the connecting vertical plate is fixedly connected to a connecting frame, a guide plate is fixedly installed on one side of the connecting frame, and a rod pulling mechanism is arranged on the top of the connecting frame.

[0007] Preferably, the rod pulling mechanism includes a fixed mounting plate, the fixed mounting plate is fixed to the top of the connecting frame, one side of the fixed mounting plate is fixedly connected to a fixed base, a second motor is fixedly mounted on the top of the fixed base, and the output end of the second motor is fixedly connected to the first pulley.

[0008] Preferably, a second pulley is provided on one side of the first pulley, a transmission belt is connected between the first pulley and the second pulley, and a rotating plate is fixedly connected to one side of the first pulley and the second pulley.

[0009] Preferably, the rotating plate is rotatably connected to the fixed mounting plate, a plurality of fixed shafts are fixedly connected to one side of the rotating plate, and a fixed block is fixedly connected to one end of the plurality of fixed shafts.

[0010] Preferably, a soil removal and collection mechanism is provided on the top of the fixed mounting plate, and the soil removal and collection mechanism includes a limiting plate, and the limiting plate is fixed on the top of the fixed mounting plate, and a fixed shell is fixedly connected to the top of the limiting plate, and a third motor is fixedly installed on the bottom of the inner wall of the fixed shell, and a brush is fixedly installed on the output end of the third motor.

[0011] Preferably, a conveying pipe is fixedly connected to one side of the limiting plate, a protective baffle is fixedly connected to the top of the conveying pipe, a conveyor belt is fixedly installed inside the conveying pipe, and a plurality of friction strips are evenly fixed on the surface of the conveyor belt.

[0012] Preferably, the soil turning mechanism comprises a rear side plate, the rear side plate is fixed to one side of the tobacco rod pulling machine collecting box, a fourth motor is fixedly mounted on one side of the rear side plate, and a rotating column is fixedly connected to the output end of the fourth motor.

[0013] Preferably, one end of the rotating column passes through the rear side plate and extends to one side of the rear side plate, the rotating column is rotatably connected to the rear side plate, and a soil-turning blade is fixedly connected to the outer side of the rotating column.

[0014] Preferably, two groups of threads are symmetrically arranged on the outer surface of the threaded rod, and the threaded rod is rotationally connected to the fixing plate.

[0015] Technical effects and advantages of the present invention:

[0016] 1. By setting up a double-row spacing adjustment mechanism and a rod pulling mechanism, the double-row spacing adjustment mechanism realizes fast and accurate spacing adjustment through a motor-driven threaded rod. When facing tobacco fields with different row spacings, there is no need to spend a lot of time on complex mechanical adjustments or replacement of equipment parts. The operator only needs to start the first motor to quickly adjust the rod pulling mechanism to the appropriate spacing to adapt to different planting layouts. This adjustable spacing design greatly improves the versatility and flexibility of the equipment, reduces operation delays caused by mismatched row spacing, and can realize simultaneous tobacco rod pulling in double rows, thereby improving operation efficiency. In actual operation, the rod pulling mechanism can quickly and effectively pull tobacco rods out of the soil through the combined design of a rotating plate, a fixed shaft and a fixed block, and can quickly transfer and put into operation between different plots. There is no need to prepare a variety of special equipment for tobacco fields with different row spacings, which further improves operation efficiency;

[0017] 2. A soil removal and collection mechanism is provided. The soil removal mechanism uses a brush for soil removal. The rotation of the brush can meticulously remove the dirt attached to the surface of the tobacco stem, making the tobacco stem cleaner. This effective soil removal method reduces the labor intensity and number of workers in the subsequent collection and processing links. The collection mechanism can stably collect and transport the tobacco stems after soil removal to a designated location through the design of a conveyor belt and a friction strip. The friction strip on the surface of the conveyor belt increases the friction between the tobacco stems and prevents the tobacco stems from slipping or rolling during transportation, resulting in damage and loss. Soil removal and collection are automatically performed, soil removal and collection efficiency is improved, and labor intensity is reduced. The damage and waste of resources caused by random scattering of tobacco stems in the field are avoided, and the overall quality and economic benefits of tobacco stem harvesting are improved;

[0018] 3. By setting up a soil-turning mechanism, the rotating column is driven to rotate. The rotating column is rotatably connected to the rear side plate, and a soil-turning blade is fixedly connected to the outside. When the rotating column rotates, the soil-turning blade rotates accordingly to turn the soil, which can turn out the residual roots in the soil, making it convenient to clean the residual tobacco stem roots, avoiding the situation where large rhizomes remain after the tobacco stems are pulled out, causing the rhizomes to develop diseases and insect pests, greatly reducing the rhizomes remaining after the tobacco stems are pulled out, thereby further reducing the situation where the rhizomes remain in the soil and causing diseases and insect pests, making it convenient for continuous planting on the land, and beneficial to improving the soil structure and subsequent land use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the top structure of the present invention.

[0021] Figure 3 It is a rear structural schematic diagram of the present invention.

[0022] Figure 4 It is a schematic diagram of the local structure of the present invention.

[0023] Figure 5 It is a schematic diagram of the rod pulling mechanism structure of the present invention.

[0024] Figure 6 It is a schematic diagram of the structure of the soil removal and collection mechanism of the present invention.

[0025] Figure 7 It is a schematic diagram of a partial side sectional structure of the present invention.

[0026] Figure 8 It is a schematic diagram of the structure of the connection between the rotating plate and the fixed block of the present invention.

[0027] The accompanying drawings are marked as follows: 1. tobacco rod pulling machine collection box; 2. machine wheel; 3. fixed plate; 4. first motor; 5. threaded rod; 6. threaded sleeve; 7. connecting plate; 8. connecting vertical plate; 9. connecting frame; 10. guide plate; 11. fixed mounting plate; 12. fixed base; 13. second motor; 14. first pulley; 15. second pulley; 16. transmission belt; 17. fixed block; 18. fixed shaft; 19. limit plate; 20. fixed shell; 21. third motor; 22. brush; 23. transmission pipe; 24. protective baffle; 25. conveyor belt; 26. friction strip; 27. rotating plate; 28. rear side plate; 29. ​​fourth motor; 30. rotating column; 31. soil turning blade. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0029] As attached Figure 1-8 The tobacco rod pulling machine with adjustable double row spacing and soil removal and collection is shown, comprising a tobacco rod pulling machine collection box 1, a plurality of machine wheels 2 are installed at the bottom of the tobacco rod pulling machine collection box 1, a double row spacing adjustment mechanism is arranged on one side of the tobacco rod pulling machine collection box 1, and a soil turning mechanism is arranged on the other side of the tobacco rod pulling machine collection box 1;

[0030] The double-row spacing adjustment mechanism includes two fixed plates 3, which are fixed on one side of the tobacco rod pulling machine collection box 1. A first motor 4 is fixedly installed on one side of the fixed plate 3. A threaded rod 5 is fixedly connected to the output end of the first motor 4. A threaded sleeve 6 is threadedly connected to the outer side of the threaded rod 5. A connecting plate 7 is fixedly connected to one side of the threaded sleeve 6. A connecting plate 7 is fixedly connected to one side of the connecting plate 7. A connecting vertical plate 8 is fixedly connected to one end of the connecting vertical plate 8. A connecting frame 9 is fixedly connected to one end of the connecting frame 9. A guide plate 10 is fixedly installed on one side of the connecting frame 9. A rod pulling mechanism is arranged on the top of the connecting frame 9.

[0031] As attached Figure 1 , 2 As shown in , 3, 4, 5, 7 and 8, the rod pulling mechanism includes a fixed mounting plate 11, the fixed mounting plate 11 is fixed on the top of the connecting frame 9, a fixed base 12 is fixedly connected to one side of the fixed mounting plate 11, a second motor 13 is fixedly mounted on the top of the fixed base 12, a first pulley 14 is fixedly connected to the output end of the second motor 13, a second pulley 15 is arranged on one side of the first pulley 14, a transmission belt 16 is connected between the first pulley 14 and the second pulley 15, a rotating plate 27 is fixedly connected to one side of the first pulley 14 and the second pulley 15, the rotating plate 27 is rotatably connected to the fixed mounting plate 11, a plurality of fixed shafts 18 are fixedly connected to one side of the rotating plate 27, and a fixed block 17 is fixedly connected to one end of the plurality of fixed shafts 18, so as to facilitate automatic rod pulling of the cigarette rod and improve the rod pulling efficiency.

[0032] As attached Figure 1 , 2 As shown in Figures 3, 4, 6 and 7, a soil removing and collecting mechanism is provided on the top of the fixed mounting plate 11, and the soil removing and collecting mechanism includes a limiting plate 19, the limiting plate 19 is fixed on the top of the fixed mounting plate 11, a fixed shell 20 is fixedly connected to the top of the limiting plate 19, a third motor 21 is fixedly installed on the bottom of the inner wall of the fixed shell 20, a brush 22 is fixedly installed on the output end of the third motor 21, so as to facilitate soil removal from the tobacco rods by the brush 22 to prevent a large amount of soil from entering the tobacco rod pulling machine collection box 1, a conveying pipe 23 is fixedly connected to one side of the limiting plate 19, a protective baffle 24 is fixedly connected to the top of the conveying pipe 23, a conveying belt 25 is fixedly installed inside the conveying pipe 23, and a plurality of friction strips 26 are evenly fixed on the surface of the conveying belt 25 to increase the friction between the tobacco rods and the conveying belt 25, so as to facilitate the conveying and collection of the tobacco rods.

[0033] As attached Figure 1-3As shown, the tilling mechanism includes a rear side plate 28, which is fixed to one side of the tobacco rod pulling machine collecting box 1, and a fourth motor 29 is fixedly installed on one side of the rear side plate 28. A rotating column 30 is fixedly connected to the output end of the fourth motor 29. One end of the rotating column 30 passes through the rear side plate 28 and extends to one side of the rear side plate 28. The rotating column 30 is rotatably connected to the rear side plate 28, and a tilling blade 31 is fixedly connected to the outer side of the rotating column 30, so as to turn the soil of the land where the tobacco rods are pulled out, turn out the rhizomes remaining in the soil, and clean up the remaining larger rhizomes after turning them out, so as to avoid the rhizomes remaining in the soil from being always in the soil to produce diseases and insect pests that affect the quality of the next planting, so as to facilitate the next planting.

[0034] As attached Figure 2 As shown, two groups of threads are symmetrically arranged on the outer surface of the threaded rod 5, and the threaded rod 5 is rotatably connected to the fixed plate 3, so that the two threaded sleeves 6 can be moved closer to or away from each other, thereby adjusting the double-row spacing of the rod pulling mechanism.

[0035] Working principle of the present invention: the double-row spacing adjustment mechanism is mainly composed of two fixed plates 3, a first motor 4, a threaded rod 5, a threaded sleeve 6, a connecting plate 7, a connecting vertical plate 8, a connecting frame 9 and a guide plate 10. When the double-row spacing needs to be adjusted, the first motor 4 is started, and its output end drives the threaded rod 5 to rotate. Since the outer surface of the threaded rod 5 is symmetrically provided with two groups of threads and is rotatably connected with the fixed plate 3, the threaded sleeve 6 is threadedly connected with the threaded rod 5. When the threaded rod 5 rotates, the two threaded sleeves 6 will move toward or away from each other on the threaded rod 5 according to the direction of the thread. One side of the threaded sleeve 6 is connected to the connecting frame 9 through the connecting plate 7 and the connecting vertical plate 8. The guide plate 10 on one side of the connecting frame 9 plays a guiding role to ensure that the connecting frame 9 moves smoothly. With the movement of the threaded sleeve 6, the connecting frame 9 and the rod pulling mechanism on its top also move accordingly, thereby realizing the adjustment of the double-row spacing. The rod pulling mechanism mainly includes a fixed mounting plate 11, a fixed base 12, a second motor 13. A first pulley 14, a second pulley 15, a transmission belt 16, a rotating plate 27, a fixed shaft 18 and a fixed block 17. After the second motor 13 is started, its output end drives the first pulley 14 to rotate, and the second pulley 15 is also rotated through the transmission action of the transmission belt 16. One side of the first pulley 14 and the second pulley 15 is fixedly connected with a rotating plate 27, and the rotating plate 27 is rotatably connected to the fixed mounting plate 11. When the pulley rotates, the rotating plate 27 is driven to rotate. One side of the rotating plate 27 is fixedly connected with a plurality of fixed shafts 18, and one end of the fixed shaft 18 is fixedly connected with a fixed block 17. The fixed shaft 18, the fixed block 17 and the rotating plate 27 form a whole. When the rotating plate 27 rotates, the plurality of the wholes also rotate. During the rotation process, the fixed block 17 contacts with the tobacco rod and generates a force, thereby pulling the tobacco rod out of the soil. The tobacco rod is pulled out in double rows to improve the efficiency of pulling out the tobacco rod.

[0036] The soil removing part of the soil removing and collecting mechanism is mainly composed of a limit plate 19, a fixed shell 20, a third motor 21 and a brush 22. When the tobacco rod is pulled out, it enters the soil removing and collecting mechanism, the third motor 21 is started, and its output end drives the brush 22 to rotate, and the brush 22 contacts the surface of the tobacco rod. Through the rotation of the brush 22 and the action of the bristles, the dirt attached to the tobacco rod is brushed off to achieve the soil removing function. The collecting part of the soil removing and collecting mechanism is mainly composed of a limit plate 19, a conveying pipe 23, a protective baffle 24, a conveyor belt 25 and a friction strip 26. After soil removal, The tobacco rods fall onto the conveyor belt under the action of gravity or other forces. A plurality of friction strips 26 are evenly fixed on the surface of the conveyor belt 25, which increase the friction between the conveyor belt 25 and the tobacco rods to prevent the tobacco rods from slipping. The conveyor belt 25 is driven by a motor or other driving device, which is not mentioned in detail in the text, but it can be inferred that it exists, and the tobacco rods are transported along the conveying pipe 23. The protective baffle 24 prevents the tobacco rods from falling, and finally the tobacco rods are collected in the collection box 1 of the tobacco rod pulling machine, and the soil removal and collection are completed automatically, without consuming a lot of manpower for manual soil removal and collection, thereby improving efficiency.

[0037] The tilling mechanism is mainly composed of a rear side plate 28, a fourth motor 29, a rotating column 30 and a tilling blade 31. When it is necessary to till the land after the tobacco rods are pulled out, the fourth motor 29 is started, and its output end drives the rotating column 30 to rotate. The rotating column 30 is rotatably connected to the rear side plate 28, and the outer side is fixedly connected with the tilling blade 31. When the rotating column 30 rotates, the tilling blade 31 rotates accordingly to turn the soil, thereby achieving the purpose of tilling the soil, so that the larger rhizomes remaining after the tobacco rods are pulled out are turned out, avoiding the rhizomes remaining in the soil from causing diseases and pests that affect the next planting, which is beneficial to improving the soil structure and subsequent land use.

[0038] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0039] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0040] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tobacco stem pulling and soil removal and collection integrated machine with adjustable double row spacing, comprising a tobacco stem pulling machine collection box (1), characterized in that: A plurality of wheels (2) are installed at the bottom of the tobacco rod pulling machine collecting box (1); a double-row spacing adjustment mechanism is provided on one side of the tobacco rod pulling machine collecting box (1); and a soil turning mechanism is provided on the other side of the tobacco rod pulling machine collecting box (1); The double-row spacing adjustment mechanism comprises two fixing plates (3), the two fixing plates (3) are fixed on one side of the tobacco rod pulling machine collecting box (1), a first motor (4) is fixedly mounted on one side of the fixing plates (3), a threaded rod (5) is fixedly connected to the output end of the first motor (4), a threaded sleeve (6) is threadedly connected to the outer side of the threaded rod (5), a connecting plate (7) is fixedly connected to one side of the threaded sleeve (6), a connecting plate (7) is fixedly connected to one side of the connecting plate (7), a connecting vertical plate (8) is fixedly connected to one side of the connecting vertical plate (8), a connecting frame (9) is fixedly connected to one end of the connecting vertical plate (8), a guide plate (10) is fixedly mounted on one side of the connecting frame (9), and a rod pulling mechanism is arranged on the top of the connecting frame (9).

2. The double-row spacing adjustable tobacco rod pulling, soil removal and collection integrated machine according to claim 1, characterized in that: The rod pulling mechanism comprises a fixed mounting plate (11), the fixed mounting plate (11) is fixed on the top of the connecting frame (9), one side of the fixed mounting plate (11) is fixedly connected to a fixed base (12), a second motor (13) is fixedly mounted on the top of the fixed base (12), and the output end of the second motor (13) is fixedly connected to a first pulley (14).

3. The double-row spacing adjustable tobacco rod pulling, soil removal and collection integrated machine according to claim 2, characterized in that: A second pulley (15) is arranged on one side of the first pulley (14); a transmission belt (16) is connected between the first pulley (14) and the second pulley (15); and a rotating plate (27) is fixedly connected to one side of each of the first pulley (14) and the second pulley (15).

4. The double-row spacing adjustable tobacco rod pulling, soil removal and collection integrated machine according to claim 3, characterized in that: The rotating plate (27) is rotatably connected to the fixed mounting plate (11); one side of the rotating plate (27) is fixedly connected to a plurality of fixed shafts (18); one end of the plurality of fixed shafts (18) is fixedly connected to a fixed block (17).

5. The double-row spacing adjustable tobacco rod pulling, soil removal and collection integrated machine according to claim 2, characterized in that: A soil removal and collection mechanism is arranged on the top of the fixed mounting plate (11), and the soil removal and collection mechanism comprises a limit plate (19), the limit plate (19) is fixed on the top of the fixed mounting plate (11), the top of the limit plate (19) is fixedly connected to a fixed shell (20), a third motor (21) is fixedly mounted on the bottom of the inner wall of the fixed shell (20), and a brush (22) is fixedly mounted on the output end of the third motor (21).

6. The double-row spacing adjustable tobacco rod pulling, soil removal and collection integrated machine according to claim 5, characterized in that: A conveying pipe (23) is fixedly connected to one side of the limiting plate (19), a protective baffle (24) is fixedly connected to the top of the conveying pipe (23), a conveying belt (25) is fixedly installed inside the conveying pipe (23), and a plurality of friction strips (26) are evenly fixed on the surface of the conveying belt (25).

7. The double-row spacing adjustable tobacco rod pulling, soil removal and collection integrated machine according to claim 1, characterized in that: The soil turning mechanism comprises a rear side plate (28), the rear side plate (28) being fixed to one side of a tobacco rod pulling machine collecting box (1), a fourth motor (29) being fixedly mounted on one side of the rear side plate (28), and a rotating column (30) being fixedly connected to an output end of the fourth motor (29).

8. The double-row spacing adjustable tobacco rod pulling, soil removal and collection integrated machine according to claim 7, characterized in that: One end of the rotating column (30) passes through the rear side plate (28) and extends to one side of the rear side plate (28); the rotating column (30) is rotatably connected to the rear side plate (28); and a soil turning blade (31) is fixedly connected to the outer side of the rotating column (30).

9. The double-row spacing adjustable tobacco rod pulling, soil removal and collection integrated machine according to claim 1, characterized in that: Two groups of threads are symmetrically arranged on the outer surface of the threaded rod (5), and the threaded rod (5) is rotationally connected to the fixing plate (3).

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