Riverway sludge cleaning device

Abstract

The application provides a river sludge cleaning device and belongs to the technical field of dredging equipment. The technical scheme is as follows: a base is provided with a support frame, and a digging mechanism is arranged on the support frame; the digging mechanism comprises a support rod, and the lower end of the support rod is provided with a bucket mechanism; the bucket mechanism comprises a semicircular arc one with an inner side facing downward, a semicircular arc two is slidably arranged on the outer side of the semicircular arc one, the semicircular arc one and the semicircular arc two are slidably matched to form a circular tube structure with a closed outer side, and the two ends of the semicircular arc one are slidably provided with closing plates; the two closing plates are slid downward to cooperate with the circular tube structure to form a circular barrel with closed two ends. The application has the advantages that the device is convenient to use and simple to operate, the problems of sludge running, dripping and leaking are avoided in the process of lifting the sludge, the cleaning effect of the sludge is improved, and the secondary pollution of river water is avoided.

Description

Technical Field

[0001] This invention relates to the field of dredging equipment technology, and more particularly to a river silt removal equipment. Background Technology

[0002] River siltation has increasingly affected the normal functioning of various river systems, including flood control, drainage, irrigation, water supply, and navigation. To restore the normal function of rivers and promote rapid and sustainable economic and social development, river dredging and desilting projects are being carried out. These projects aim to deepen and widen rivers, clarify the water, and significantly improve the production conditions and living environment of the local population, achieving the goal of "clear water, unobstructed rivers, green banks, and beautiful scenery."

[0003] The current process for clearing silt from river channels generally involves: constructing cofferdams to partially close the river channel; pumping water; using sewage pumps to remove silt and transporting it to tanker trucks for unloading; manually cleaning up debris (including garbage and stones); hoisting it to a temporary storage point on the bank; and finally, transporting the debris to the unloading point by truck. Before construction, the site must be leveled and roads cleared according to the overall construction plan. A site survey must be conducted to verify elevations and the relative positions of the site to surrounding buildings. A comprehensive and reasonable arrangement must be made for construction water and electricity, temporary facilities, etc. Construction management personnel must prepare safety signs, safety prohibition signs, and the required seven signs and one map, as well as all necessary management items and fire-fighting equipment. The construction process is complex and may interrupt the river channel, affecting its normal functions such as flood control, drainage, irrigation, water supply, and navigation. It also has the disadvantages of a long construction period, large workload, and high cleanup costs.

[0004] If a long-arm excavator in a floating vessel is used for dredging, the impact on various functions of the river channel is basically eliminated, and the cost and time of river silt removal are greatly reduced. However, because the backhoe bucket is subjected to the pressure of the river water during the lifting process, some silt is lost. The "running, dripping, and leaking" in the process not only mixes the river water and causes secondary pollution, but also significantly reduces the silt removal effect. Therefore, it is rarely used and is generally only implemented as a last resort. For this reason, the present invention provides a river silt removal device. Summary of the Invention

[0005] The purpose of this invention is to provide a river silt cleaning device that is simple to operate and has a good dredging effect.

[0006] This invention is achieved through the following measures:

[0007] A river silt removal device, characterized in that it includes a base, a support frame is provided on the base, and a digging mechanism is provided on the support frame. The base can be fixed on a vehicle on the riverbank or on a boat in the river.

[0008] The excavation mechanism includes a support rod, and a bucket mechanism is provided at the lower end of the support rod;

[0009] The bucket mechanism includes a semicircular arc I with its inner side facing downwards, and a semicircular arc II slidably disposed on the outer side of the semicircular arc I. The semicircular arc I and the semicircular arc II slide together to form a circular tube structure with a closed outer side. Both ends of the semicircular arc I are slidably disposed with sealing plates. The sealing plates on both sides slide down and cooperate with the circular tube structure to form a cylindrical barrel with both ends closed. The silt is sealed in the cylindrical barrel, and no silt will be lost when it is lifted, thereby reducing secondary pollution to the river water.

[0010] The invention also has the following specific features:

[0011] A pair of vertical rods are provided on both ends of the semicircular arc. A support plate is provided between the upper sides of the pair of vertical rods on the same side. A horizontal plate is provided between the support plates on both sides. The horizontal plate is provided on the lower end face of the support rod.

[0012] On the inner surfaces of the pair of vertical rods on the same side of the semicircular arc, there is a sliding groove. A matching closing plate is slidably arranged between the two sliding grooves. Limiting plates are provided on both sides of the upper end of the closing plate. When the closing plate slides to the bottom and just closes the end face of the circular tube structure, the limiting plate just abuts against the upper end face of the vertical rod to achieve the limiting function.

[0013] A connecting plate is provided between the upper ends of the two closed plates, and the connecting plate connects the two closed plates into a whole.

[0014] A pair of arc-shaped grooves are provided on the outer surface of the first semicircular arc, and a pair of circular sliding rods are provided on the second semicircular arc to slide in cooperation with the arc-shaped grooves. The pair of circular sliding rods are respectively slidably disposed in the corresponding pair of arc-shaped grooves. When the bucket mechanism moves down and reaches the bottom of the river, the bottom of the circular sliding rod touches the bottom first, which plays a role in limiting the position of the entire device.

[0015] The bucket mechanism also includes a transmission mechanism;

[0016] The transmission mechanism includes a ring gear 1 disposed on the outer surface of the second semicircular arc. A rotating shaft 1 is disposed between a pair of vertical rods on both sides of the first semicircular arc. A gear 2 is disposed around the rotating shaft 1 and meshes with the gear 1. When the gear 2 rotates, it drives the gear 1 to rotate, thereby driving the second semicircular arc to rotate, thus closing the first semicircular arc and forming a closed circular tube structure. When the bucket mechanism moves down until the first semicircular arc contacts the silt and extends into the silt, the water inside the first semicircular arc will be discharged from both ends because the two ends of the first semicircular arc are open. Then, the second semicircular arc is rotated to close, and finally the corresponding silt is sealed in the circular tube structure.

[0017] A second rotating shaft is provided between the two support plates. A third gear is provided around the second rotating shaft. A rack that meshes with the third gear is provided on one side of the connecting plate. When the third gear rotates, it can drive the rack to slide up and down, thereby realizing the closing and opening of the two ends of the circular tube structure by the closing plate.

[0018] A sprocket is arranged around the first rotating shaft, and a sprocket is arranged around the second rotating shaft. A chain connects the first sprocket and the second sprocket. The arrangement of the first sprocket and the second sprocket enables the simultaneous movement of the sealing plate and the semicircular arc to form the barrel, ultimately sealing the sludge inside the barrel.

[0019] A sprocket three is arranged around the second rotating shaft. The upper end of the support rod is connected to the third rotating shaft via a pair of brackets. A sprocket four is arranged around the third rotating shaft. A chain two connects the third and fourth sprockets. A motor is arranged on one side of the support rod via bracket two. One end of the third rotating shaft is located on the output end of the motor. By reasonably setting the motor, the transmission mechanism, and related transmission parameters, the simultaneous closing and opening / closing of the sealing plate and the semicircular arc two can be achieved. The transmission parameters are mainly gear ratios, which are existing technologies and will not be described in detail here.

[0020] The support frame includes a turntable mounted on the base, which allows the excavation mechanism to rotate, facilitating the transfer of silt. The turntable is equipped with a pair of telescopic rods, each telescopic rod including a fixed rod and a sliding rod slidably mounted on the fixed rod. A crossbar is mounted on the free end of the pair of telescopic rods, and a through groove is provided on the upper side of the crossbar. The support rod is slidably mounted within the through groove, and the crossbar is positioned around the support rod between the motor and the bucket mechanism.

[0021] A spring is provided around the periphery of each of the two telescopic rods. One end of the spring is located on the turntable, and the other end of the spring is located on the crossbar. The spring can cause the telescopic rod to be in a telescopic state, thereby raising the crossbar to a certain height.

[0022] The turntable is equipped with an L-shaped rod, and an electric telescopic rod is mounted on the L-shaped rod. The free end of the electric telescopic rod is mounted on the crossbar. The electric telescopic rod can press down on the crossbar, thereby pressing down on the bucket mechanism to overcome the resistance of the silt and extend into the silt.

[0023] A pulley is provided on the side of the crossbar, and a wire-fixing ring is provided on the corresponding side of the support rod. The wire-fixing ring is located at the lower end of the support rod near the bucket mechanism. A winch is provided on the turntable, and the wire rope on the winch passes around the pulley and is set on the wire-fixing ring. The winch can be used to lower and raise the digging mechanism.

[0024] The crossbar is provided with a second sliding groove, the second sliding groove is through the through sliding groove, a limit rod is slidably provided in the second sliding groove, a third sliding groove is provided on one side of the crossbar, which is through the second sliding groove, and a handle is provided on the limit rod that extends out of the third sliding groove.

[0025] The support rod has several limiting holes on its corresponding side, and the corresponding end of the limiting rod is set in the corresponding limiting hole, thereby limiting the position of the excavation mechanism.

[0026] In use, the base of this device is installed on a vehicle on the riverbank or on a boat in the river. Then, the winch is started to lower the device, and the support rod slides down, allowing the excavation mechanism to reach the bottom of the river. After contacting the silt, the support rod is locked by the limiting rod. Then, the electric telescopic rod presses down on the support rod, causing the first semicircular arc to overcome the resistance of the silt and extend into the silt. This will start the motor, and the transmission mechanism will cause the second semicircular arc and the two side sealing plates to move simultaneously to close and form the cylinder. During this process, the silt is trapped inside the cylinder. Then, the winch lifts the cylinder out of the river and rotates it to a designated position via the turntable to unload the silt.

[0027] The beneficial effects of this invention are: the equipment is convenient to use and simple to operate, and avoids the problems of "running, dripping and leaking" of silt during the process of lifting silt, thereby improving the silt cleaning effect and avoiding secondary pollution of river water. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0029] Figure 2 for Figure 1 A magnified view of A in the middle.

[0030] Figure 3 This is a schematic diagram of the rear structure of an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the structure of the bucket mechanism after it is enclosed into a cylinder in an embodiment of the present invention.

[0032] The attached diagram is labeled as follows: 1. Base; 2. Turntable; 3. L-shaped rod; 4. Handle; 5. Slide groove three; 6. Crossbar; 7. Electric telescopic rod; 8. Limiting hole; 9. Motor; 10. Sprocket four; 11. Chain two; 12. Support rod; 13. Sprocket three; 14. Shaft two; 15. Connecting plate; 16. Gear two; 17. Shaft one; 18. Semicircular arc two; 19. Circular slide rod; 20. Gear one; 21. Enclosing plate; 22. Vertical rod; 23. Sprocket one; 24. Support plate; 25. Chain one; 26. Crossbar; 27. Sprocket two; 28. Gear three; 29. ​​Rack; 30. Spring; 31. Winch; 32. Wire rope; 33. Pulley; 34. Wire-fixing ring; 35. Semicircular arc one; 36. Arc-shaped slide groove. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0037] See Figure 1-4A river silt removal device includes a base 1, a support frame on the base 1, and a digging mechanism on the support frame. The base 1 can be fixed on a vehicle on the riverbank or on a boat in the river.

[0038] The excavation mechanism includes a support rod 12, and a bucket mechanism is provided at the lower end of the support rod 12;

[0039] The bucket mechanism includes a semicircular arc 35 with its inner side facing downwards, and a semicircular arc 18 that is slidably arranged on the outer side of the semicircular arc 35. The semicircular arc 35 and the semicircular arc 18 slide together to form a circular tube structure with a closed outer side. Both ends of the semicircular arc 35 are slidably provided with sealing plates 21. The sealing plates 21 slide down and cooperate with the circular tube structure to form a cylindrical barrel with both ends closed. The silt is sealed inside the cylindrical barrel, and the silt will not be lost when it is lifted, thereby reducing secondary pollution to the river water.

[0040] A pair of vertical rods 22 are provided on both sides of the semicircular arc 35. A support plate 24 is provided between the upper sides of the pair of vertical rods 22 on the same side. A horizontal plate 26 is provided between the two support plates 24. The horizontal plate 26 is provided on the lower end face of the support rod 12.

[0041] On the inner surfaces of the pair of vertical rods 22 on the same side of the semicircular arc 35, there are sliding grooves. A matching closing plate 21 is slidably arranged between the two sliding grooves. Limiting plates are provided on both sides of the upper end of the closing plate 21. When the closing plate 21 slides to the bottom and just closes the end face of the circular tube structure, the limiting plate just abuts against the upper end face of the vertical rod 22 to achieve the limiting function.

[0042] A connecting plate 15 is provided between the upper ends of the two side sealing plates 21, and the connecting plate 15 connects the two side sealing plates 21 into a whole.

[0043] A pair of arc-shaped grooves 36 are provided on the outer surface of the first semicircular arc 35. A pair of circular sliding rods 19 are provided on the corresponding second semicircular arc 18, which slide in conjunction with the arc-shaped grooves 36. The pair of circular sliding rods 19 are respectively slidably disposed in the corresponding pair of arc-shaped grooves 36. When the bucket mechanism moves down and reaches the bottom of the river, the bottom of the circular sliding rod 19 touches the bottom first, which plays a role in limiting the entire device.

[0044] The bucket mechanism also includes a transmission mechanism;

[0045] The transmission mechanism includes a ring gear 20 set on the outer surface of the semicircular arc 18, a rotating shaft 17 between a pair of vertical rods 22 on both sides of the semicircular arc 35, and a gear 16 meshing with the gear 20 on the periphery of the rotating shaft 17. The rotation of the gear 16 drives the gear 20 to rotate, thereby driving the semicircular arc 18 to rotate, thus closing the semicircular arc 35 and forming a closed circular tube structure. When the bucket mechanism moves down until the semicircular arc 35 contacts the silt and extends into the silt, the water inside the semicircular arc 35 will be discharged from both ends because the two ends of the semicircular arc 35 are open. Then the semicircular arc 18 is rotated to close, and finally the corresponding silt is closed in the circular tube structure.

[0046] A rotating shaft 24 is provided between the two support plates 24. A gear 3 28 is provided around the rotating shaft 24. A rack 29 that meshes with the gear 3 28 is provided on one side of the connecting plate 15. When the gear 3 28 rotates, it can drive the rack 29 to slide up and down, thereby realizing the closing and opening of the two ends of the circular tube structure by the closing plate 21.

[0047] A sprocket 23 is arranged around the first shaft 17, and a sprocket 27 is arranged around the second shaft 14. A chain 25 connects the first sprocket 23 and the second sprocket 27. The arrangement of the first sprocket 23 and the second sprocket 27 can realize the simultaneous movement of the sealing plate 21 and the semi-circular arc 18, so as to achieve the sealing and form a barrel, and finally seal the sludge inside the barrel.

[0048] A sprocket 13 is arranged around the second rotating shaft 14. The upper end of the support rod 12 is connected to the third rotating shaft via a pair of brackets. A sprocket 10 is arranged around the third rotating shaft. A chain 11 connects the third rotating shaft 13 and the fourth rotating shaft 10. A motor 9 is arranged on one side of the support rod 12 via a bracket. One end of the third rotating shaft is located on the output end of the motor 9. By reasonably setting the motor 9, the transmission mechanism, and related transmission parameters, the simultaneous closing and opening / closing of the closed plate 21 and the semi-circular arc 18 can be achieved. The transmission parameters are mainly the gear transmission ratio, which is existing technology and will not be described in detail.

[0049] The support frame includes a turntable 2 mounted on the base 1. The turntable 2 allows the excavation mechanism to rotate, facilitating the transfer of silt. A pair of telescopic rods are mounted on the turntable 2. Each telescopic rod includes a fixed rod and a sliding rod that is slidably mounted on the fixed rod. A crossbar 6 is mounted on the free end of the pair of telescopic rods. A through groove is mounted on the upper side of the crossbar 6. A support rod 12 is slidably mounted in the through groove. The crossbar 6 is mounted around the support rod 12 between the motor 9 and the bucket mechanism.

[0050] A spring 30 is provided on the periphery of each of the two telescopic rods. One end of the spring 30 is set on the turntable 2, and the other end of the spring 30 is set on the crossbar 6. The spring 30 can make the telescopic rods extend and retract, thereby raising the crossbar 6 to a certain height.

[0051] An L-shaped rod 3 is installed on the turntable 2, and an electric telescopic rod 7 is installed on the L-shaped rod 3. The free end of the electric telescopic rod 7 is installed on the crossbar 6. The electric telescopic rod 7 can press down the crossbar 6, and finally press down the bucket mechanism to overcome the resistance of the silt and extend into the silt.

[0052] A pulley 33 is provided on the side of the crossbar 6, and a wire rope ring 34 is provided on the corresponding side of the support rod 12. The wire rope ring 34 is located at the lower end of the support rod 12 near the bucket mechanism. A winch 31 is provided on the turntable 2. The wire rope 32 on the winch 31 passes around the pulley 33 and is placed on the wire rope ring 34. The lowering and lifting of the excavation mechanism can be achieved by the winch 31.

[0053] A second sliding groove is provided inside the crossbar 6, and a limit rod is slidably provided inside the second sliding groove. A third sliding groove 5 is provided on one side of the crossbar 6, which extends into the second sliding groove. A handle 4 is provided on the limit rod that extends out of the third sliding groove 5.

[0054] Several limiting holes 8 are provided on the corresponding side of the support rod 12, and the corresponding end of the limiting rod is set in the corresponding limiting hole 8, thereby limiting the position of the excavation mechanism.

[0055] In use, the base 1 of this equipment is installed on a vehicle on the riverbank or on a boat in the river. Then, the winch 31 is started to lower the equipment, and the support rod 12 slides down, so that the digging mechanism goes down to the bottom of the river. After contacting the silt, the limit rod locks the support rod 12. Then, the electric telescopic rod 7 presses down the support rod 12, so that the semicircular arc 1 35 overcomes the resistance of the silt and extends into the silt. Only the motor 9 is started, and the transmission mechanism causes the semicircular arc 2 18 and the two side sealing plates 21 to move simultaneously to close and form a cylinder. During this process, the silt is sealed in the cylinder. Then, the winch 31 lifts the cylinder out of the river and rotates it to the designated position by the turntable 2 to unload the silt.

[0056] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A river silt removal device, characterized in that, Includes a base (1), on which a support frame is provided, and on which a digging mechanism is provided; The excavation mechanism includes a support rod (12), and a bucket mechanism is provided at the lower end of the support rod (12); The bucket mechanism includes a semicircular arc one (35) with its inner side facing downwards. A semicircular arc two (18) is slidably provided on the outer side of the semicircular arc one (35). The semicircular arc one (35) and the semicircular arc two (18) slide together to form a circular tube structure with its outer side closed. Both ends of the semicircular arc one (35) are slidably provided with a closing plate (21). The closing plates (21) on both sides slide down and cooperate with the circular tube structure to form a cylindrical barrel with both ends closed. A pair of vertical rods (22) are provided on both sides of the semicircular arc (35). A support plate (24) is provided between the upper sides of the pair of vertical rods (22) on the same side. A horizontal plate (26) is provided between the support plates (24) on both sides. The horizontal plate (26) is provided on the lower end face of the support rod (12). On the inner surfaces of the pair of vertical rods (22) on the same side of the semicircular arc (35), there are sliding grooves. A matching closed plate (21) is slidably arranged between the two sliding grooves. Limiting plates are provided on both sides of the upper end of the closed plate (21). A connecting plate (15) is provided between the upper ends of the two closed plates (21); A pair of arc-shaped sliding grooves (36) are provided on the outer surface of the first semicircular arc (35), and a pair of circular sliding rods (19) that slide in cooperation with the arc-shaped sliding grooves (36) are provided on the corresponding second semicircular arc (18). The pair of circular sliding rods (19) are respectively slidably disposed in the corresponding pair of arc-shaped sliding grooves (36). The bucket mechanism also includes a transmission mechanism; The transmission mechanism includes a ring gear (20) disposed on the outer surface of the second semicircular arc (18), a rotating shaft (17) disposed between a pair of vertical rods (22) on both sides of the first semicircular arc (35), and a gear (16) meshing with the gear (20) disposed around the rotating shaft (17). A rotating shaft two (14) is provided between the two support plates (24), and a gear three (28) is provided around the rotating shaft two (14). A rack (29) that meshes with the gear three (28) is provided on one side of the connecting plate (15). A sprocket (23) is provided around the first rotating shaft (17), a sprocket (27) is provided around the second rotating shaft (14), and a chain (25) is provided connecting the first sprocket (23) and the second sprocket (27). A sprocket three (13) is provided around the second rotating shaft (14). The upper end of the support rod (12) is provided with the third rotating shaft through a pair of brackets. A sprocket four (10) is provided around the third rotating shaft. A chain two (11) is provided around the third rotating shaft (13) and the fourth rotating shaft (10). A motor (9) is provided on one side of the support rod (12) through a bracket. One end of the third rotating shaft is provided on the output end of the motor (9). As the bucket mechanism moves down until the first semicircular arc (35) contacts the silt and extends into the silt, the water inside the first semicircular arc (35) is discharged from both ends due to the open ends of the first semicircular arc (35). The sealing plate (21) and the second semicircular arc (18) move simultaneously through the first sprocket (23) and the second sprocket (27) to achieve the sealing and form the barrel.

2. The river silt removal equipment according to claim 1, characterized in that, The support frame includes a turntable (2) mounted on the base (1). A pair of telescopic rods are mounted on the turntable (2). A crossbar (6) is mounted on the free end of the pair of telescopic rods. A through groove is mounted on the upper side of the crossbar (6). The support rod (12) is slidably mounted in the through groove. The crossbar (6) is mounted around the support rod (12) between the motor (9) and the bucket mechanism.

3. The river silt removal equipment according to claim 2, characterized in that, A spring (30) is provided on the periphery of each of the two telescopic rods. One end of the spring (30) is provided on the turntable (2), and the other end of the spring (30) is provided on the crossbar (6).

4. The river silt removal equipment according to claim 3, characterized in that, An L-shaped rod (3) is provided on the turntable (2), and an electric telescopic rod (7) is provided on the L-shaped rod (3). The free end of the electric telescopic rod (7) is provided on the crossbar (6).

5. The river silt removal equipment according to claim 4, characterized in that, A pulley (33) is provided on the side of the crossbar (6), and a wire-fixing ring (34) is provided on the corresponding side of the support rod (12). The wire-fixing ring (34) is located at the lower end of the support rod (12) near the bucket mechanism. A winch (31) is provided on the turntable (2), and the wire rope (32) on the winch (31) passes around the pulley (33) and is then placed on the wire-fixing ring (34).

6. The river silt removal equipment according to claim 5, characterized in that, The crossbar (6) is provided with a second sliding groove, the second sliding groove is connected through the through sliding groove, a limit rod is slidably provided in the second sliding groove, a third sliding groove (5) is provided on one side of the crossbar (6) and is connected to the second sliding groove, and a handle (4) is provided on the limit rod that passes through the third sliding groove (5). The support rod (12) has several limiting holes (8) on its corresponding side, and the corresponding end of the limiting rod is set in the corresponding limiting hole (8).

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