A type of overflow slag collection weir for water conservancy and hydropower projects

Abstract

This invention discloses a flow-through slag collection weir for hydraulic and hydropower projects, comprising a slag-blocking structure, a slag-collecting structure, and a slope arranged along the river direction, as well as a first lifting device and a second lifting device for driving the slag-collecting structure and the slag-blocking structure to rise and fall, respectively. The slag-blocking structure filters out stones and debris in the water, causing the stones and debris to settle to the bottom of the riverbed. The slag-collecting structure collects the stones and debris. The slope supports the back of the slag-collecting structure to improve its resistance to water flow impact. By placing the slag-blocking structure upstream of the slag-collecting structure rather than downstream, even if the slag-blocking structure deforms due to long-term impact from stones and debris, its performance in filtering stones and debris will not be affected, and no stone and debris accumulation area will occur downstream of the slag-collecting structure. Furthermore, both the slag-collecting structure and the slag-blocking structure can be raised and lowered, thus enabling the slag-collecting structure to descend and the slag-blocking structure to rise to collect stones and debris, and the slag-collecting structure to rise and the slag-blocking structure to descend to clear stones and debris.

Description

Technical Field

[0001] This invention relates to the field of weirs, and more specifically to a flow-through slag collection weir for water conservancy and hydropower projects. Background Technology

[0002] In water conservancy and hydropower projects, the current general technique for excavating dam abutment slopes or riverbank slopes is to set up a slag collection platform at the foot of the riverbank slope to collect stone debris. However, due to the steepness of the slope, the slag collection platform can only collect a limited amount of stone debris. The excavated stone debris will enter the river channel and be carried downstream by the water flow, causing river siltation and soil erosion. At the same time, the construction of a slag collection platform at the foot of the slope is very difficult.

[0003] Related technologies disclose weirs capable of collecting and cleaning stone debris, such as: Chinese Patent Publication No. CN112030887A discloses a flow-through slag collection weir for water conservancy and hydropower projects and its construction method; CN111335279A discloses a flow-through slag collection weir for water conservancy and hydropower projects and its construction method.

[0004] The relevant technology uses a perforated frame upstream of the weir to collect stone debris in the river channel and lifts the perforated frame to clean the collected stone debris inside. However, only the heavier stone debris can usually enter the perforated frame. In order for the perforated frame to collect the lighter stone debris as well, the perforated frame needs to be designed to be very high, or a perforated plate needs to be arranged on the back of the perforated frame to intercept the light stone debris in the water.

[0005] If the perforated frame is designed to be very tall and not tip over due to the impact of flowing water, it needs to be quite heavy, making it difficult for the perforated frame to rise from the water.

[0006] If a perforated plate is placed on the back of the perforated frame, the perforated plate is easily deformed by the impact of stone chips in the water for a long time, which will lead to gaps between the perforated frame and the perforated plate. Stone chips entering the gaps will hinder the raising and lowering of the perforated frame. Summary of the Invention

[0007] The purpose of this invention is to provide a flow-through slag collection weir for water conservancy and hydropower projects, so as to solve the technical problem that the existing flow-through slag collection weirs used for collecting stone slag are difficult to withstand the impact of water flow and stone slag.

[0008] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0009] This application provides a flow-through slag collection weir for water conservancy and hydropower projects, comprising: a flow-through weir body, disposed in a river channel and spanning the river channel, the flow-through weir body including a slope protruding from the bottom of the riverbed; a slag collection structure, vertically and flexibly disposed in front of the slope, the slag collection structure having a shape that conforms to the riverbed and the top surface of the slope; a first lifting device, disposed on the riverbank, the first lifting device being used to drive the slag collection structure to rise and fall; a slag-blocking structure, vertically and flexibly disposed upstream of the slag collection structure, the slag-blocking structure being used to filter stone debris in the water, causing the stone debris to settle towards the bottom of the riverbed upstream of the slag collection structure; and a second lifting device, disposed on the riverbank, the second lifting device being used to drive the slag-blocking structure to rise and fall.

[0010] Furthermore, the first lifting device has two actuators and is respectively connected to the front end and the rear end of the slag collection structure. The end of the slag collection structure closer to the upstream is the front end, and the end of the slag collection structure closer to the downstream is the rear end. The first lifting device is used to drive the front end and the rear end of the slag collection structure to lift at a differential speed, so that the front end of the slag collection structure rises while the rear end sinks during the lifting process.

[0011] Furthermore, the first lifting device includes a rotating shaft erected on both sides of the riverbank or spanning the river channel. A first winch and a second winch are coaxially mounted on the rotating shaft. The diameter of the first winch is greater than the diameter of the second winch. The first winch is connected to the front end of the slag collection structure via a rope, and the second winch is connected to the rear end of the slag collection structure via a rope.

[0012] Furthermore, a valley is provided on the riverbed upstream of the slope, which is concave downward along the slope surface, and the slag collection structure is a scoop-shaped structure arranged along the slope and the valley.

[0013] Furthermore, the slag-blocking structure includes multiple slag-blocking units, each of which is a long, hollow shell. The multiple slag-blocking units are adjacent to each other to form a vertical plate shape that can extend from the river surface to the riverbed and span the river channel. The side of the slag-blocking unit facing upstream of the river channel is provided with a slag inlet channel for the slag to enter the interior of the slag-blocking unit. The slag-blocking unit can accommodate the slag and expose the slag on the side of the slag-blocking unit facing upstream of the river channel.

[0014] Furthermore, the plurality of said slag-blocking units are connected to each other by hinges to form a roller shutter structure.

[0015] Furthermore, the second lifting device includes a drum, the slag-blocking structure is wound on the drum and one end of it is fixedly connected to the drum.

[0016] Furthermore, the bottom of the slag-blocking unit is provided with a slag discharge channel, and there is a gap between the edge of the slag discharge channel and the top surface of another adjacent slag-blocking unit, which prevents the stone slag from passing through.

[0017] Furthermore, the slag-blocking unit includes a body and side plates. The body is a long strip plate with an S-shaped cross-section. The side plates are fixedly attached to both ends of the body. The slag discharge channel is formed at the bottom of the body. The side of the body facing the upstream of the river channel has several through holes. The hinge is connected to the side plates.

[0018] Furthermore, a flow-blocking structure is formed in the river channel upstream of the weir, the flow-blocking structure having a horizontal bottom wall and vertical side walls on both sides of the bottom wall, the side walls being adjacent to the side of the slag-blocking structure.

[0019] Compared with the prior art, this application has the following advantages:

[0020] A flow-through slag collection weir for water conservancy and hydropower projects is provided. It filters stone debris from the water through a slag-blocking structure, causing the debris to settle to the riverbed bottom upstream of the slag collection structure. Simultaneously, the slag collection structure collects the stone debris, and the weir body supports the back of the slag collection structure to improve its resistance to water flow impact. Positioning the slag-blocking structure upstream of the slag collection structure, rather than downstream, ensures that even if the slag-blocking structure deforms due to long-term impact from stone debris, its slag-filtering performance will not be affected, and no stone debris accumulation area will occur downstream of the slag collection structure. Furthermore, both the slag collection structure and the slag-blocking structure can be raised and lowered, allowing for the lowering of the slag collection structure and the raising of the slag-blocking structure to collect stone debris, as well as the raising of the slag collection structure and the lowering of the slag-blocking structure to clear stone debris. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] Figure 1 A three-dimensional view of the overflow slag collection weir;

[0023] Figure 2 This is a structural diagram of the weir body.

[0024] Figure 3 This is a top view of the overflow slag collection weir;

[0025] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0026] Figure 5 for Figure 4 A magnified view of a portion at point C;

[0027] Figure 6 for Figure 3 A cross-sectional view along the BB direction;

[0028] Figure 7 A partial three-dimensional view of the preferred structure of the slag-blocking unit;

[0029] The labels in the diagram represent the following:

[0030] 10-Flow weir body; 11-Slope; 12-Valley; 20-Slag collection structure; 30-Slag blocking structure; 31-Hinge; 40-First lifting device; 41-Rotating shaft; 420-Windlass; 421-First winch; 421-Second winch; 43-Rope; 50-Slag blocking unit; 51-Slag inlet channel; 52-Slag outlet channel; 53-Body; 54-Side plate; 60-Second lifting device; 61-Drum; 70-Stone chips; 80-Flow blocking structure. Detailed Implementation

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0032] The existing overflow weirs for collecting stone chips 70 have porous frames that cannot withstand the impact of water flow, and porous plates that cannot withstand the impact of stone chips 70 for a long time. As a result, the existing overflow weirs for collecting stone chips 70 can only be used in shallow rivers with slow water flow.

[0033] Therefore, such as Figure 1-7 As shown, this embodiment provides:

[0034] A slag collection weir used in water conservancy and hydropower projects includes a slag collection structure 10, a slag collection structure 20, a slag blocking structure 30, a first lifting device 40, and a second lifting device 60.

[0035] The weir 10 is set in the river channel and spans the river channel. The weir 10 includes a slope 11 that protrudes from the bottom of the riverbed.

[0036] The slag collection structure 20 is vertically and flexibly installed in front of the slope 11, and the slag collection structure 20 is shaped to match the riverbed and the top surface of the slope 11.

[0037] The first lifting device 40 is arranged on the riverbank and is used to drive the slag collection structure 20 to lift.

[0038] The slag-blocking structure 30 is vertically and vertically installed upstream of the slag-collecting structure 20. The slag-blocking structure 30 is used to filter stone slag 70 in the water, so that the stone slag 70 sinks to the bottom of the riverbed upstream of the slag-collecting structure 20.

[0039] The second lifting device 60 is arranged on the riverbank and is used to drive the slag-blocking structure 30 to lift.

[0040] Specifically: The first lifting device 40 is used to lift the slag collection structure 20 to transport the stone slag 70 inside it out of the river channel, so that excavators or other devices can remove the stone slag 70.

[0041] The second lifting device 60 is used to change the position of the bottom end of the slag-blocking structure 30. Since the slag-blocking structure 30 does not need to block all the stone chips 70 at all times, the height of its bottom end only needs to be slightly lower than the top of the slag-collecting structure 20 so that the stone chips 70 will not cross the flow weir 10. However, when the slag-collecting structure 20 rises to the water surface to clean the stone chips 70 inside it, the slag-blocking structure 30 needs to be able to completely block the stone chips 70 in order to prevent the stone chips 70 from entering the valley 12 and affecting the reset of the slag-collecting structure 20.

[0042] After being blocked by the slag-blocking structure 30 and moving along the water flow at the bottom of the riverbed, the stone debris 70 enters the interior of the slag collection structure 20. Lacking the power and potential energy to cross the flow weir 10, it can only remain inside the slag collection structure 20.

[0043] Meanwhile, the back of the slag collection structure 20 is blocked by the slope 11, which gives the slag collection structure 20 good resistance to water flow impact.

[0044] Unlike existing related technologies, in this embodiment, the slag-blocking structure 30 is located upstream of the slag-collecting structure 20 rather than downstream. Even if the slag-blocking structure 30 is deformed due to long-term impact from the stone slag 70, it will not affect its performance in filtering the stone slag 70, nor will it cause an accumulation area of ​​stone slag 70 downstream of the slag-collecting structure 20.

[0045] Furthermore, because the front end of the slag collection structure 20 is lower than the rear end, the stone chips 70 at the front end of the slag collection structure 20 are prone to fall off when the slag collection structure 20 is lifted from the riverbed.

[0046] Therefore, this embodiment provides an optional technical solution to solve the above problems, the specific structure of which is described below.

[0047] The first lifting device 40 has two actuators and is respectively connected to the front end and the rear end of the slag collection structure 20. The end of the slag collection structure 20 closer to the upstream is the front end, and the end of the slag collection structure 20 closer to the downstream is the rear end. The first lifting device 40 is used to drive the front end and the rear end of the slag collection structure 20 to lift at a differential speed, so that the front end of the slag collection structure 20 rises while the rear end sinks during the lifting process.

[0048] At the bottom of the riverbed, the front end of the slag collection structure 20 is lower and the rear end is higher, so that the stone chips 70 can enter the interior of the slag collection structure 20 and cannot be removed.

[0049] When above the river surface, the front and rear ends of the slag collection structure 20 are at the same height, so as to catch the stone slag 70 inside, making it difficult for the stone slag 70 to fall into the river.

[0050] Furthermore, this embodiment also provides a structure for the first lifting device 40 to realize the front and rear ends of the differential lifting slag collection structure 20, as described below.

[0051] The first lifting device 40 includes a rotating shaft 41 set on both sides of the riverbank or spanning the river channel. A first winch 421 and a second winch 422 are coaxially mounted on the rotating shaft 41. The diameter of the first winch 421 is greater than the diameter of the second winch 422. The first winch 421 is connected to the front end of the slag collection structure 20 by a rope 43, and the second winch 422 is connected to the rear end of the slag collection structure 20 by a rope 43.

[0052] The first lifting device 40 also includes a motor (not shown in the figure) connected to the rotating shaft 41. The motor drives the rotating shaft 41 to rotate, and the rotating shaft 41 drives the first winch 421 and the second winch 422 to rotate, thereby hoisting the rope 43. The rope 43 lifts the slag collection structure 20 from the bottom of the riverbed.

[0053] Since the diameter of the first winch 421 is greater than the diameter of the second winch 422, when the rotation speeds of the first winch 421 and the second winch 422 are the same, the front end of the slag collection structure 20 connected to the first winch 421 by the rope 43 rises faster, while the rear end of the slag collection structure 20 rises slower, thus allowing the slag collection structure 20 to gradually adjust its angle during the ascent.

[0054] Furthermore: Even if the slag collection structure 20 is rotated during the upward process, so that its front end is raised and its rear end is lowered, making it difficult for the stone slag 70 to fall out of the slag collection structure 20, the stone slag 70 is still easy to fall out of its front end due to the vibration when the slag collection structure 20 is first started.

[0055] Therefore, this embodiment provides an optional technical solution to solve the above problems, the specific structure of which is described below.

[0056] A valley 12 is set on the riverbed upstream of slope 11, which is concave downward along the slope of slope 11. The slag collection structure 20 is a sieve-shaped structure arranged along slope 11 and valley 12.

[0057] The front end of the slag collection structure 20, which is attached to the valley 12, forms an upward-curving structure, making it difficult for the stone chips 70 inside the slag collection structure 20 to fall off from its front end.

[0058] Meanwhile, Valley 12 also causes the slag collection structure 20 to form a structure embedded in the riverbed. Under the weight of the stone slag 70 and the impact of the water flow, the slag collection structure 20 is closely attached to the slope 11 and Valley 12.

[0059] Furthermore, since the slag-blocking structure 30 needs to withstand the impact of the stone chips 70 for a long time, it is prone to deformation and wear, resulting in a short service life and requiring frequent maintenance and replacement.

[0060] Therefore, this embodiment provides an optional technical solution to solve the above problems, the specific structure of which is described below.

[0061] The slag-blocking structure 30 includes multiple slag-blocking units 50, each of which is a long, hollow shell. The multiple slag-blocking units 50 are adjacent to each other to form a vertical plate shape that can extend from the river surface to the riverbed and span the river channel. The side of the slag-blocking unit 50 facing upstream of the river channel is provided with a slag inlet channel 51 for the stone slag 70 to enter the interior of the slag-blocking unit 50. The slag-blocking unit 50 can accommodate the stone slag 70 and expose the stone slag 70 on the side of the slag-blocking unit 50 facing upstream of the river channel.

[0062] The slag-blocking unit 50 is covered with through holes (not shown in the figure). The through holes are used for water to pass through and for exposing the stone chips 70 to the outside of the slag-blocking unit 50. This allows the stone chips 70 in the river water to first hit the stone chips 70 stored inside the slag-blocking unit 50 before contacting the slag-blocking unit 50, which reduces the number of times the slag-blocking unit 50 is hit by the stone chips 70 to a certain extent.

[0063] At the same time, the stone chips 70 can also increase the weight of the slag-blocking unit 50, so that the slag-blocking structure 30 can have good resistance to water flow impact.

[0064] Furthermore, since the slag-blocking structure 30 is connected to the actuator of the second lifting device 60, the water flow impact force borne by the slag-blocking structure 30 acts on the actuator of the second lifting device 60, forming a torque on the actuator of the second lifting device 60, which can easily cause damage to the second lifting device 60.

[0065] Therefore, this embodiment provides an optional technical solution to solve the above problems, such as... Figure 5 and 7 As shown, its specific structure is as follows.

[0066] Multiple slag-blocking units 50 are connected to each other via hinges 31 to form a roller shutter structure.

[0067] Based on the above embodiments, this application connects the slag-blocking unit 50 through the hinge 31, making the slag-blocking structure 30 flexible, thereby making the slag-blocking structure 30 more resistant to water flow impact. When the slag-blocking structure 30 first enters the water, it floats with the water flow, and the slag-blocking structure 30 only generates a pulling force on the actuator of the second lifting device 60.

[0068] Furthermore, this embodiment also provides a structure for the second lifting device 60 to achieve the purpose of lifting the slag-blocking structure 30, as described below.

[0069] The second lifting device 60 includes a drum 61, a slag-blocking structure 30 wound on the drum 61 and one end of which is fixedly connected to the drum 61.

[0070] The second lifting device 60 also includes a motor (not shown in the figure) connected to the drum 61. The motor drives the drum 61 to rotate, and the drum 61 drives the slag-blocking unit to roll up to lift the slag-blocking structure 30 from the water, or the drum 61 drives the slag-blocking unit to unfold to place the slag-blocking structure 30 into the water.

[0071] Furthermore, since the slag-blocking structure 30 will be wound around the drum 61 when it is raised, the stone slag 70 stored inside the slag-blocking unit 50 will leak through the slag inlet channel 51 and spread across the drum 61 to the downstream of the flow weir body 10, or enter between the slag-blocking structure 30 and the slag-blocking structure 30, causing the slag-blocking structure 30 to be stuck.

[0072] Therefore, this embodiment provides an optional technical solution to solve the above problems, the specific structure of which is described below.

[0073] The bottom of the slag-blocking unit 50 is provided with a slag discharge channel 52, and there is a gap between the edge of the slag discharge channel 52 and the top surface of another adjacent slag-blocking unit 50, which prevents the stone chips 70 from passing through.

[0074] When the slag-blocking unit 50 is in a vertical position, the stone slag 70 cannot flow out through the gap between the slag discharge channel 52 of one slag-blocking unit 50 and the other slag-blocking unit 50. When the slag-blocking structure 30 is bent close to the drum 61, the slag-blocking unit 50 tilts, so that the slag-blocking unit 50 and the slag-blocking unit 50 below it are no longer on the same plane, thus exposing the slag discharge channel 52, allowing the stone slag 70 to leak out through the slag discharge channel 52.

[0075] The stone debris 70 inside the debris-blocking unit 50 sinks down to the bottom of the riverbed along the debris-blocking structure 30.

[0076] Furthermore, this embodiment also provides a structure for a slag-blocking unit 50 that can accommodate stone chips 70, has a slag inlet channel 51 and a slag outlet channel 52, and is easy to manufacture and inexpensive, as described below.

[0077] The slag-blocking unit 50 includes a body 53 and a side plate 54. The body is a long strip plate with an S-shaped cross-section. The side plate 54 is fixedly attached to both ends of the body 53. The slag discharge channel 52 is formed at the bottom of the body 53. Several through holes (not shown in the figure) are formed on the side of the body 53 facing the upstream of the river. The hinge 31 is connected to the side plate 54.

[0078] The S-shaped slag-blocking unit 50 naturally has a slag inlet channel 51 and a bottom wall that can hold the stone slag 70. It only needs to open a slag outlet channel 52 at the bottom of the main body 53 to allow the stone slag 70 to pass through, and open several through holes on the side of the main body 53 facing the upstream of the river to hold the stone slag 70 and expose part of the stone slag 70 on the outside of the main body 53.

[0079] Both the top and bottom ends of the side plate 54 have through holes for mounting the hinge 31.

[0080] Furthermore: When the slag-blocking unit 50 is damaged, the hinge 31 can be removed to replace the damaged part of the slag-blocking unit 50. For this purpose, the slag-blocking units 50 should be of the same structure and size to facilitate replacement. This results in the slag-blocking structure 30 formed by connecting the slag-blocking units 50 being rectangular, while the river channel is not rectangular, resulting in a gap between the river channel and the slag-blocking structure 30 that allows the stone chips 70 to pass through.

[0081] Therefore, this embodiment provides an optional technical solution to solve the above problems, the specific structure of which is described below.

[0082] A flow-blocking structure 80 is formed in the river channel upstream of the weir 10. The flow-blocking structure 80 has a horizontal bottom wall and vertical side walls on both sides of the bottom wall, which are adjacent to the side of the slag-blocking structure 30.

[0083] The flow-blocking structure 80 is used to change the river channel into a rectangular shape that matches the slag-blocking structure 30.

[0084] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A flow-through slag collection weir for water conservancy and hydropower projects, characterized in that, include, A weir (10) is set in the river channel and spans the river channel. The weir (10) includes a slope (11) that protrudes from the bottom of the riverbed and a valley (12) that is recessed downward along the slope (11) is provided on the riverbed upstream of the slope (11). The slag collection structure (20) is vertically and flexibly arranged in front of the slope (11), and the slag collection structure (20) is in the shape of a sieve arranged along the slope (11) and the valley (12); The first lifting device (40) is arranged on the riverbank and is used to drive the slag collection structure (20) to lift. A slag-blocking structure (30) is vertically and elliptically disposed upstream of the slag-collecting structure (20). The slag-blocking structure (30) is used to filter stone slag (70) in the water, so that the stone slag (70) sinks to the bottom of the riverbed upstream of the slag-collecting structure (20). The second lifting device (60) is arranged on the riverbank and is used to drive the slag-blocking structure (30) to lift. The slag-blocking structure (30) includes multiple slag-blocking units (50), each slag-blocking unit (50) being a long, hollow shell. The multiple slag-blocking units (50) are adjacent to each other to form a vertical plate shape that can extend from the river surface to the riverbed and span the river channel. The side of the slag-blocking unit (50) facing the upstream of the river channel is provided with a slag inlet channel (51) for the stone slag (70) to enter the interior of the slag-blocking unit (50). The slag-blocking unit (50) can accommodate the stone slag (70) and expose the stone slag (70) on the side of the slag-blocking unit (50) facing the upstream of the river channel. Multiple slag-blocking units (50) are connected to each other via hinges (31) to form a roller shutter structure; The second lifting device (60) includes a drum (61), the slag-blocking structure (30) is wound on the drum (61) and one end of it is fixedly connected to the drum (61); The bottom of the slag-blocking unit (50) is provided with a slag discharge channel (52), and there is a gap between the edge of the slag discharge channel (52) and the top surface of another adjacent slag-blocking unit (50) that the stone chips (70) cannot pass through. The slag-blocking unit (50) includes a body (53) and a side plate (54). The body is a long strip plate with an S-shaped cross-section. The side plate (54) is fixedly attached to both ends of the body (53). The slag discharge channel (52) is formed at the bottom of the body (53). The side of the body (53) facing the upstream of the river channel has several through holes. The hinge (31) is connected to the side plate (54). A flow-blocking structure (80) is formed in the river channel upstream of the flow-through weir (10). The flow-blocking structure (80) has a horizontal bottom wall and vertical side walls on both sides of the bottom wall, which are adjacent to the side of the slag-blocking structure (30).

2. The overflow slag collection weir for water conservancy and hydropower projects according to claim 1, characterized in that, The first lifting device (40) has two actuators and is respectively connected to the front end and the rear end of the slag collection structure (20). The end of the slag collection structure (20) closer to the upstream is the front end, and the end of the slag collection structure (20) closer to the downstream is the rear end. The first lifting device (40) is used to drive the front end and the rear end of the slag collection structure (20) to lift at a differential speed, so that the front end of the slag collection structure (20) rises while the rear end sinks during the lifting process.

3. A flow-through slag collection weir for water conservancy and hydropower projects according to claim 1, characterized in that, The first lifting device (40) includes a rotating shaft (41) set on both sides of the riverbank or spanning the river channel. A first winch (421) and a second winch (422) are coaxially mounted on the rotating shaft (41). The diameter of the first winch (421) is greater than the diameter of the second winch (422). The first winch (421) is connected to the front end of the slag collection structure (20) by a rope (43), and the second winch (422) is connected to the rear end of the slag collection structure (20) by a rope (43).

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