Flood control device

Abstract

This invention discloses a debris-blocking device, comprising: a debris-blocking plate, which is vertically and elevatingly installed between the walls on both sides of a navigation channel and its bottom inserted into the water depth; a pair of connecting members are provided on each side of the debris-blocking plate, and multiple floating buoys are provided at the bottom of each connecting member; a gate is provided between the pairs of connecting members in the upper middle part of the debris-blocking plate; a pair of gate plates with opposite directions of movement are provided at the gate to block the gate; the lowest point of the gate is lower than the lowest point of passing vessels. This invention does not need to be removed during navigation and can effectively intercept floating objects during navigation, preventing them from entering the navigation channel.

Description

Technical Field

[0001] This invention relates to the field of pollution control technology, specifically to a floating debris interception device. Background Technology

[0002] For navigation structures such as locks and ship lifts with navigation channels, excessive floating debris such as branches and garbage entering the channel can obstruct ship navigation and potentially damage equipment such as the filling and emptying pumps and water seals in the lock chamber and ship lift docking gap. Therefore, measures are needed to prevent large amounts of floating debris from entering the channel. Currently, the most common method is to install a drift barrier cable or oil boom at the channel entrance. The deployment and removal of these measures generally require towing by a workboat, which is usually time-consuming. To avoid affecting navigation efficiency, these drift barriers are generally only deployed during non-navigation periods, and therefore cannot effectively prevent floating debris from entering the channel during navigation hours. Summary of the Invention

[0003] This invention provides a drift-blocking device, which consists of a retractable debris-blocking plate installed between the walls on both sides of the navigation channel, and a gate opening located in the upper middle part of the debris-blocking plate. A movable gate plate is installed at the gate opening to block the gate opening. When navigation is needed, the gate plate is moved to open the gate opening to allow ships to pass. When navigation is finished, the gate plate is moved to close the gate opening, eliminating the need for repeated disassembly and assembly of the device for navigation.

[0004] This invention provides a float-blocking device, comprising:

[0005] The debris barrier is vertically and elevatingly installed between the walls on both sides of the channel and its bottom is inserted into the deep water. Each side of the debris barrier is provided with a pair of connectors, and the bottom of each connector is provided with multiple floats floating on the water surface. A gate is provided between the pairs of connectors in the upper middle part of the debris barrier. A pair of gate plates with opposite directions of movement are provided at the gate to block the gate. The lowest point of the gate is lower than the lowest point of the passing vessels.

[0006] Preferably, the drift blocking device further includes: a pair of vertical limiting slide grooves, which are respectively installed on the walls on both sides of the navigation channel, and the two ends of the debris blocking plate are respectively movably locked in the two limiting slide grooves;

[0007] A pair of lifting wheels are respectively installed on the top of the walls on both sides of the channel. A main lifting rope is wound on the lifting wheels, and the free end of the main lifting rope is connected to one end of the debris barrier along its corresponding limiting groove.

[0008] Preferably, in the drift-blocking device, a rotating fixed pulley is provided on the wall, and the main lifting rope moves across the groove of the fixed pulley.

[0009] Preferably, in the aforementioned drift-blocking device, the drift-blocking plate has a pair of front connectors facing the ship's approach side, and a pair of rear connectors facing away from the ship's approach side. The opposite ends of the pair of front connectors are aligned with both ends of the drift-blocking plate, and the opposite ends of the pair of rear connectors are aligned with both ends of the drift-blocking plate. The opposite front and rear connectors are engaged in the corresponding limiting grooves at their aligned ends with the drift-blocking plate. Each of the opposite front and rear connectors has a connecting ring, and each connecting ring is connected to the free end of the main lifting rope via a branch lifting rope.

[0010] Preferably, in the aforementioned drift-blocking device, the front connecting member includes a front connecting plate, which is perpendicularly connected to the debris-blocking plate, the front connecting plate is provided with a retrieval hole, and the float is provided at the bottom of the front connecting plate.

[0011] Preferably, in the aforementioned debris-blocking device, a rectangular walking plate is detachably provided between a pair of front connecting plates, and one long side of the walking plate is tangent to the debris-blocking plate.

[0012] Preferably, in the drift-blocking device, each of the pair of front connecting plates is provided with an L-shaped limiting plate, and the traveling plate is locked between the pair of limiting plates.

[0013] Preferably, in the aforementioned drift-blocking device, the rear connecting member includes:

[0014] A rear connecting plate is perpendicularly connected to the debris barrier plate. The rear connecting plate is an L-shaped plate composed of a horizontal plate and a vertical plate. One end of the vertical plate is connected to the horizontal plate and the other end is connected to the debris barrier plate. The float is provided at the bottom of the horizontal plate.

[0015] The rear connecting frame is L-shaped, consisting of horizontal and vertical bars. One end of the horizontal bar is vertically connected to the debris barrier, and the other end is connected to the top of the vertical bar. The bottom end of the vertical bar is connected to the horizontal bar.

[0016] Preferably, in the aforementioned debris-blocking device, a main slider is provided at the bottom of the gate plate, and a horizontal main moving groove corresponding to the position of the main slider is provided on the debris-blocking plate. One end of the main slider is movably engaged in the main moving groove, and the other end is provided with a threaded hole. The internal threads in the threaded holes of a pair of main sliders rotate in opposite directions. A screw is rotatably inserted into the threaded hole, and the screw is provided with an external thread that matches the internal thread in the threaded hole. A pair of fixed plates are provided near both ends of the debris-blocking plate and perpendicularly connected to it. The two ends of the screw are rotatably inserted into the pair of fixed plates, and a driven sprocket is sleeved on the screw. A waterproof motor is provided at the top of the debris-blocking plate, and a driving sprocket is provided at the output shaft end of the waterproof motor. The driving sprocket and the driven sprocket are connected by a chain.

[0017] Preferably, in the aforementioned debris-blocking device, the debris-blocking plate is provided with a secondary moving chute parallel to the main moving chute, and the gate plate is provided with a secondary slider, which is movably inserted into the secondary moving chute.

[0018] The present invention has at least the following beneficial effects: The present invention provides a retractable debris barrier between the walls on both sides of the navigation channel, and a gate is provided in the upper middle part of the debris barrier. A movable gate plate is provided at the gate to seal the gate. When navigation is required, the gate plate is moved to open the gate, allowing ships to pass. When navigation ends, the gate plate is moved to close the gate. Simultaneously, the debris barriers on both sides of the gate effectively intercept floating debris that drifts to both sides due to water thrust during ship passage. The debris-blocking device of the present invention does not need to be removed during navigation and can effectively intercept floating debris during navigation, preventing it from entering the navigation channel.

[0019] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of the drift-blocking device in one of the technical solutions of the present invention;

[0021] Figure 2 This is a rear view schematic diagram of the drift-blocking device in one of the technical solutions of the present invention;

[0022] Figure 3 This is a top view of the drift-blocking device in one of the technical solutions of the present invention;

[0023] Figure 4 This is a schematic diagram of the connection structure between the front connecting plate and the walking plate in one of the technical solutions of the present invention;

[0024] Among them, 1-limiting slide, 2-wall, 3-buoy, 4-front connecting plate, 5-dirt barrier plate, 6-main lifting rope, 7-lifting wheel, 8-fixed pulley, 9-traveling plate, 10-gate plate, 11-rear connecting frame, 12-waterproof motor, 13-drive sprocket, 14-chain, 15-rear connecting plate, 16-main slider, 17-screw, 18-secondary moving slide, 19-main moving slide, 20-driven sprocket, 21-connecting ring, 22-retrieval hole, 23-limiting plate. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0026] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0027] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials mentioned are commercially available. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They 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 this invention.

[0028] like Figure 1 , Figure 2 , Figure 3 As shown, this application provides a drift-blocking device, comprising:

[0029] The debris barrier 5 is vertically and elevatingly installed between the walls 2 on both sides of the channel and its bottom is inserted into the deep water. Each side of the debris barrier 5 is provided with a pair of connectors. Multiple floats 3 that float on the water surface are detachably installed at the bottom of each connector. A gate is provided between the pairs of connectors in the upper middle part of the debris barrier 5. A pair of gate plates 10 with opposite directions of movement are provided at the gate to block the gate. The lowest point of the gate is lower than the lowest point of the passing ships.

[0030] The main body of the debris-blocking device provided in this technical solution consists of vertically elevating debris-blocking plates 5 installed in front of the walls 2 on both sides of the navigation channel. The debris-blocking plates 5 can be plates with multiple water passages or prefabricated frames with wire mesh. The bottom of the debris-blocking plates 5 is inserted into the deep water. A pair of connectors are provided on both sides of the debris-blocking plates 5. Multiple floats 3 are detachably installed at the bottom of the connectors for easy replacement. The floats 3 float on the water surface, allowing the debris-blocking plates 5 to float on the water surface and intercept floating debris. A gate is provided in the upper middle part of the debris-blocking plates 5, located between the pairs of connectors. A pair of movable gates are provided at the gate. Plate 10 blocks the gate entrance. A pair of gate plates 10 move in opposite directions. Moving them in opposite directions opens the gate entrance, allowing ships to pass through. Moving them in opposite directions blocks the gate entrance, preventing floating debris from entering the navigation channel. The lowest point of the gate entrance is lower than the lowest point of passing ships, and the specific setting can be adjusted according to actual conditions. The debris barrier 5 can be configured as two detachable parts. When full navigation is required, the lower part can be removed, and the upper part of the debris barrier 5 can be raised off the water surface to a certain height to allow full navigation of the navigation channel. Alternatively, the buoy 3 can be removed, and the debris barrier 5 can be lowered to a certain depth in the water to allow full navigation of the navigation channel.

[0031] The working process of the drift blocking device in this technical solution is as follows: when navigation is required, a pair of gate plates 10 are moved back to back until the gate is fully opened. After the ship has finished navigating, the pair of gate plates 10 are moved towards each other until the gate plates 10 block the gate.

[0032] This technical solution includes at least the following beneficial effects: the pontoon 3 and the connecting parts are detachably connected, facilitating the disassembly and replacement of the pontoon 3; the debris barrier 5 is raised and lowered between the two walls 2, allowing for easy raising and lowering of the debris barrier 5 to a certain position according to the needs of full navigation, thus avoiding obstruction of full navigation; the bottom of the debris barrier 5 is inserted into the deep water to intercept floating objects / debris in the deep water; a gate is set between the paired connecting parts in the upper part of the debris barrier 5, and a pair of gate plates 10 with opposite moving directions are set at the gate to block the gate, with the two gate plates 10 moving in opposite directions. When the gate is opened, it allows ships to pass. The two gate plates 10 move towards each other to block the gate and intercept floating objects. During navigation, when a ship reaches the gate, the floating objects on the water surface are pushed to both sides of the ship, i.e., the sides of the gate. At this time, the gate opens, and the ship passes through the gate. The floating objects are intercepted by the debris barriers 5 on both sides of the gate. This allows ships to pass through without removing the debris barrier. The debris barriers 5 on both sides of the gate can effectively intercept floating objects during navigation and prevent them from entering the navigation channel.

[0033] In another technical solution, such as Figure 1 , Figure 2 , Figure 3As shown, the drift blocking device also includes: a pair of vertical limiting slide grooves 1, which are respectively set on the walls 2 on both sides of the navigation channel, and the two ends of the debris blocking plate 5 are respectively moved and locked in the two limiting slide grooves 1.

[0034] A pair of lifting wheels 7 are respectively installed at the top of the walls 2 on both sides of the navigation channel. A main lifting rope 6 is wound around each lifting wheel 7. The free end of the main lifting rope 6 is connected to one end of the debris barrier 5 along its corresponding limiting groove 1. The lifting wheels 7 are supported by a support frame with a rotatable support shaft. The lifting wheels 7 are sleeved on the support shaft. One end of the support shaft is connected to the output shaft of a lifting motor and is driven by the lifting motor to rotate forward and backward, causing the lifting wheels 7 to raise and lower the main lifting rope 6. One end of the main lifting rope 6 is connected to the lifting wheel 7, and the other end, the free end, extends along its corresponding limiting groove 1 and is connected to one end of the debris barrier 5. The rotation of the lifting wheels 7 raises and lowers the main lifting rope 6, causing the debris barrier 5 to move up and down to meet navigation and debris interception requirements. The two ends of the debris barrier 5 are moved and locked within the two limiting grooves 1, restricting the horizontal position of the debris barrier 5 and preventing horizontal displacement.

[0035] In another technical solution, such as Figure 1 , Figure 2 As shown, in the aforementioned drift-blocking device, a rotating fixed pulley 8 is provided on the wall 2, and the main lifting rope 6 moves along the groove of the fixed pulley 8. The fixed pulley 8 stabilizes the position of the main lifting rope 6 and reduces the moving friction of the main lifting rope 6, making the movement smoother.

[0036] In another technical solution, such as Figure 1 , Figure 2 , Figure 3 As shown, in the aforementioned drift-blocking device, the drift-blocking plate 5 has a pair of front connectors facing the ship's entry side and a pair of rear connectors facing away from the ship's entry side. The opposite ends of the pair of front connectors are aligned with the two ends of the drift-blocking plate 5, and the opposite ends of the pair of rear connectors are aligned with the two ends of the drift-blocking plate 5. The opposite front and rear connectors are engaged in the corresponding limiting groove 1 with the aligned ends of the drift-blocking plate 5. Each of the opposite front and rear connectors is provided with a connecting ring 21, and the connecting ring 21 is connected to the free end of the main lifting rope 6 through a branch lifting rope. The secondary lifting rope and the main lifting rope 6 can be made of hemp rope, iron chain, etc. They are connected to the front connector and the main lifting rope 6, and to the rear connector and the main lifting rope 6, through the secondary lifting ropes. This indirectly connects the debris barrier 5 to the main lifting rope 6, avoiding uneven force on the front and rear connectors when the main lifting rope 6 is directly connected to a certain part of the debris barrier 5, which would cause tilting and jamming during lifting. The front and rear connectors are connected to the secondary lifting ropes through the connecting ring 21, which facilitates the disassembly and assembly of the secondary lifting ropes. The secondary lifting ropes do not need to directly contact the front and rear connectors during disassembly and assembly, thus preventing damage to the front and rear connectors.

[0037] In another technical solution, such as Figure 1 , Figure 3 As shown, in the aforementioned drift-blocking device, the front connecting member includes a front connecting plate 4, which is vertically connected to the debris-blocking plate 5. The front connecting plate 4 is provided with a retrieval hole 22, and the float 3 is provided at the bottom of the front connecting plate 4. A railing is provided near the edge of the retrieval hole 22 of the debris-blocking plate 5, and the railing is connected to the front connecting plate 4. Workers can stand on the front connecting plate 4 between the railing and the debris-blocking plate 5 and use retrieval tools to retrieve floating objects / debris intercepted by the debris-blocking plate 5 in deep water through the retrieval hole 22. A retrieval basket or bucket for loading floating objects / debris can be locked at the retrieval hole 22 for limiting its position.

[0038] In another technical solution, such as Figure 1 , Figure 3 , Figure 4 As shown, in the aforementioned debris-blocking device, a rectangular walking plate 9 is detachably installed between a pair of front connecting plates 4, and one long side of the walking plate 9 is tangent to the debris-blocking plate 5. The walking plate 9 is positioned close to the debris-blocking plate 5, forming a walking and retrieval channel with the two front connecting plates 4, to facilitate workers to walk and stand on it, hold onto the debris-blocking plate 5, and use retrieval tools to retrieve and clean floating objects / debris, or to inspect some parts of the interception device.

[0039] In another technical solution, such as Figure 4 As shown, in the aforementioned drift-blocking device, each of the pair of front connecting plates 4 is equipped with an L-shaped limiting plate 23, and the traveling plate 9 is secured between the pair of limiting plates 23. The openings of the pair of limiting plates 23 face each other and towards the debris-blocking plate 5. The traveling plate 9 is secured between the pair of limiting plates 23 and the debris-blocking plate 5 to prevent it from moving arbitrarily. When the traveling plate 9 is not needed, it can be removed from between the pair of limiting plates 23 to prevent it from affecting navigation.

[0040] In another technical solution, such as Figure 1 , Figure 2 , Figure 3 As shown, in the aforementioned drift-blocking device, the rear connecting member includes:

[0041] The rear connecting plate 15 is perpendicularly connected to the debris barrier 5. The rear connecting plate 15 is an L-shaped plate composed of a horizontal plate and a vertical plate. One end of the vertical plate is connected to the horizontal plate and the other end is connected to the debris barrier 5. The float 3 is provided at the bottom of the horizontal plate.

[0042] The rear connecting frame 11 is L-shaped, consisting of a horizontal bar and a vertical bar. One end of the horizontal bar is vertically connected to the debris barrier 5, and the other end is connected to the top of the vertical bar. The bottom end of the vertical bar is connected to the horizontal bar. The openings of the two rear connecting plates 15 face each other, providing a position for the gate plate 10 to move. The gate plate 10 moves in and out of the openings. The rear connecting frame 11 is used to stabilize the position of the rear connecting plates 15. The height of the horizontal bar is higher than the top of the gate plate 10 so that the gate plate 10 can move smoothly through the opening end of the rear connecting frame 11 when it moves.

[0043] In another technical solution, such as Figure 1 , Figure 2 , Figure 3 As shown, in the aforementioned debris-blocking device, a main slider 16 is provided at the bottom of the gate plate 10, and a horizontal main moving groove 19 corresponding to the position of the main slider 16 is provided on the debris-blocking plate 5. One end of the main slider 16 is movably locked in the main moving groove 19, and the other end is provided with a threaded hole. The internal threads in the threaded holes of the pair of main sliders 16 have opposite directions. A screw 17 is rotatably inserted into the threaded hole. The screw 17 is provided with an external thread that matches the internal thread in the threaded hole. A pair of fixed plates are provided on the debris-blocking plate 5 near its two ends and are perpendicularly connected to it. The two ends of the screw 17 are rotatably inserted into the pair of fixed plates. A driven sprocket 20 is sleeved on the screw 17. A waterproof motor 12 is provided on the top of the debris-blocking plate 5. A drive sprocket 13 is provided at the output shaft end of the waterproof motor 12. The drive sprocket 13 and the driven sprocket 20 are connected by a chain 14.

[0044] The waterproof motor 12 drives the drive sprocket 13 to rotate, which in turn drives the chain 14 to move and drive the driven sprocket 20 to rotate. This causes the screw 17 to rotate synchronously with the driven sprocket 20. Under the constraint of the main moving slide 19, the two main sliders 16 move towards or away from each other along the screw, and drive the two gate plates 10 to move towards or away from each other, so as to block or open the gate for intercepting floating objects or allowing navigation. The waterproof motor 12 can be connected to a fixed power source via a waterproof wire. The length of the wire can be adjusted according to the floating condition of the debris-blocking device. The waterproof motor 12 can be mounted on the debris-blocking plate 5 via a fixing bracket. The screw 17 can be rotatably inserted into the fixing plate via a bearing structure. A pair of fixing plates are used to support and limit the position of the screw 17. The screw 17 can also be equipped with a limit block to prevent the main moving blocks from moving excessively.

[0045] In another technical solution, such as Figure 2 As shown, in the aforementioned debris-blocking device, the debris-blocking plate 5 is provided with a secondary moving chute 18 parallel to the main moving chute 19, and the gate plate 10 is provided with a secondary slider, which is movably inserted into the secondary moving chute 18. The secondary moving chute 18 and the secondary slider cooperate to further restrict the position of the gate plate 10, preventing it from tipping over due to water ripples and water thrust.

[0046] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention. Applications, modifications, and variations of the invention will be readily apparent to those skilled in the art.

[0047] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A floating barrier, characterized in that The utility model provides a kind of waterway cleaning device, including: The baffle is vertically lifted and arranged between the wall of both sides of navigation channel and is inserted into water depth at bottom, both sides of the baffle are provided with a pair of connecting pieces, the bottom of the connecting piece is provided with a plurality of floating pontoon floating on water surface, a pair of connecting pieces are provided between the upper middle part of the baffle Gate opening, a pair of gate plates moving in opposite directions are provided at the gate opening to block the gate opening, the lowest part of the gate opening is lower than the lowest part of passing ship; A pair of vertical limiting sliding groove is arranged on the wall of both sides of navigation channel respectively, both ends of the baffle are moved and clamped in two limiting sliding grooves respectively; A pair of lifting wheel is arranged on the top of the wall of both sides of navigation channel respectively, main lifting rope is wound on the lifting wheel, the free end of the main lifting rope is connected with one end of the baffle along its corresponding limiting sliding groove; The baffle is provided with a pair of front connecting pieces facing the ship entering side, and a pair of rear connecting pieces facing away from the ship entering side, the distal end of a pair of front connecting pieces is aligned with both ends of the baffle respectively, the distal end of a pair of rear connecting pieces is aligned with both ends of the baffle respectively, the opposite front connecting pieces and rear connecting pieces are clamped in the corresponding limiting sliding groove of the aligned end of the baffle, the opposite front connecting pieces and rear connecting pieces are provided with connecting rings, and the connecting rings are connected with the free end of the main lifting rope through sub-lifting rope.

2. A debris fence according to claim 1, wherein, The wall is provided with a rotating fixed pulley, and the main lifting rope moves across the groove of the fixed pulley.

3. A device according to claim 1 or 2, wherein the device is a floating barrier. The front connecting piece includes a front connecting plate connected perpendicularly to the baffle, the front connecting plate is provided with a fishing hole, and the bottom of the front connecting plate is provided with the floating pontoon.

4. A barrier according to claim 3, c h a r a c t e r i s e d in that A rectangular walking plate is detachably arranged between a pair of front connecting plates, and one long side of the walking plate is tangent to the baffle.

5. A barrier according to claim 4, c h a r a c t e r i s e d in that A pair of front connecting plates are provided with L-shaped limiting plates, and the walking plate is clamped between a pair of limiting plates.

6. A device according to claim 1, c h a r a c t e r i z e d in that The rear connecting piece includes: a rear connecting plate connected perpendicularly to the baffle, the rear connecting plate is an L-shaped plate composed of a horizontal plate and a vertical plate, one end of the vertical plate is connected to the horizontal plate, and the other end is connected to the baffle, and the bottom of the horizontal plate is provided with the floating pontoon; a rear connecting frame composed of a horizontal rod and a vertical rod, one end of the horizontal rod is connected perpendicularly to the baffle, the other end is connected to the top end of the vertical rod, and the bottom end of the vertical rod is connected to the horizontal plate.

7. A device according to claim 1, wherein The bottom of the gate plate is provided with a main sliding block, the baffle is provided with a horizontal main moving sliding groove corresponding to the position of the main sliding block, one end of the main sliding block is clamped in the main moving sliding groove, the other end is provided with a threaded hole, the internal threads in a pair of main sliding blocks are opposite in rotation direction, a screw rod is rotatably inserted in the threaded hole, the screw rod is provided with external threads matched with the internal threads in the threaded hole, a pair of fixed plates connected perpendicularly to the baffle are arranged near both ends of the baffle, the screw rod is rotatably inserted in a pair of fixed plates, a driven sprocket is sleeved on the screw rod, a waterproof motor is arranged on the top of the baffle, a driving sprocket is arranged on the output shaft end of the waterproof motor, and the driving sprocket and the driven sprocket are connected through a chain.

8. A barrier according to claim 7, c h a r a c t e r i z e d in that The trash screen is provided with a secondary moving sliding slot parallel to the main moving sliding slot, and the gate plate is provided with a secondary sliding block which is movably inserted into the secondary moving sliding slot.

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