Two-way water flow self-traction hydraulic lifting sewage interception coarse screen

Abstract

The present invention discloses a bidirectional water flow self-traction hydraulic lifting sewage interception coarse screen. The bidirectional water flow self-traction hydraulic lifting sewage interception coarse screen includes: a tubular sliding track; a buoyancy box type screen chain, which is formed by connecting a plurality of sections of buoyancy box type screens, and each section of the buoyancy box type screen is connected by an inter-segment connection hinge; at least one end of the buoyancy box type screen chain is connected to the tubular sliding track through a track connection hinge, and the track connection hinge automatically rises and falls along the tubular sliding track as the water level changes; at least one automatic threading and detaching pin mechanism, which automatically connects or detaches the inter-segment connection hinge at the corresponding position; a propeller propulsion mechanism; a remote control unit and an energy storage unit combination. The screen body of the bidirectional water flow self-traction hydraulic lifting sewage interception coarse screen of the present application is not entirely fixed, which can reduce costs while realizing the automatic interception, collection, gathering and cleaning of large floating objects that threaten pumping stations under bidirectional water flow and different water level conditions. The individual parts are detachable for easy maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of sewage interception and cleaning in water conservancy and hydropower projects, and in particular to a sewage interception coarse grid used before a water inlet pool of a pump station in a water conservancy hub. Background Art

[0002] Large and medium-sized two-way inlet and outlet pumping stations are equipped with one or more sewage interception and cleaning mechanisms before and after the inlet and outlet tanks to prevent waste from entering the units, damaging the pump blades, and interfering with the pumping station's operation. Pumping stations with large sewage volumes or the threat of storms often have a coarse sewage interception screen installed in front of the sewage cleaning equipment to intercept large sewage, preventing it from clogging and affecting its normal operation due to large sewage that exceeds the cleaning capacity of the sewage cleaning equipment. It also prevents large sewage from hitting the equipment during storms and causing damage.

[0003] Existing sewage interception coarse screens at pumping stations mostly use fixed screens, requiring a concrete foundation and embedded fixings. Because the water level fluctuates significantly during pumping station operation, the fixed screens must be laid out from the bottom to the surface. To ensure the strength and rigidity of the fixed screens, concrete piers are typically used to divide a wide inlet pool (river channel) into multiple perforations, which not only wastes civil engineering investment, but also requires manual removal of large floating objects blocking the fixed sewage interception screens, which is also a very difficult task. Furthermore, the fixed screens can only be hoisted and disassembled, requiring specialized equipment and high maintenance costs. Some are even fixed and cannot be disassembled. Summary of the Invention

[0004] The present application proposes a bidirectional water flow self-traction hydraulic lifting sewage interception coarse screen, which aims to solve the problem of high cost and difficult cleaning of fixed screens in the prior art.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A bidirectional water flow self-traction hydraulic lifting sewage interception coarse screen includes: a tubular sliding track, which is fixed to the shore; a floating box type screen chain, which is composed of several sections of floating box type screens, and each section of the floating box type screens is connected by an inter-segment connecting hinge; at least one end of the floating box type screen chain is connected to the tubular sliding track through a track connecting hinge, and the track connecting hinge moves on the tubular sliding track as the water level rises and falls; at least one automatic threading and detaching pin mechanism, the automatic threading and detaching pin mechanism is provided on the side of the floating box type screen, and the automatic threading and detaching pin mechanism automatically connects or detaches from the inter-segment connecting hinge at the corresponding position; a propeller propulsion mechanism, which is provided on at least one section of the floating box type screen; a remote control unit and an energy storage unit combination, which is provided on the floating box type screen provided with the propeller propulsion mechanism, and the remote control unit and the energy storage unit combination sends control signals to the automatic threading and detaching pin mechanism and the propeller propulsion mechanism and provides energy.

[0007] Preferably, the structure of each section of the pontoon-type grid body includes: two groups of floating structures, wherein the floating structure includes: a pontoon located at the upper end; and a frame without a bottom plate located at the bottom; a group of bars, both ends of which are fixedly connected to the same side edge of the pontoon and the frame; the two groups of floating structures are fixed together relative to each other, and two groups of connecting ear plates are respectively provided between the relative pontoons and between the frames.

[0008] Preferably, the tubular sliding track includes: a track steel tube, the lower end of which is fixed in a concrete structure; a top pivot structure fixed to the top end of the track steel tube, and the top pivot structure is fixed to the concrete structure through a tie rod and a ground anchor bar.

[0009] Due to the adoption of the above-mentioned technical solution, the grid bodies of the bidirectional water flow self-traction hydraulic lifting sewage interception coarse grid of this application are not all fixed, which can reduce costs while realizing the automatic interception, collection, gathering and cleaning of large floating objects that threaten the pump station under bidirectional water flow and different water level conditions. Each object can be disassembled and replaced for easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a plan layout diagram of the present invention;

[0011] Figure 2 A partial enlarged view of the connecting shore portion of the plan view of the present invention;

[0012] Figure 3 A partial enlarged view of the connecting shore portion of the elevation view of the present invention;

[0013] Figure 4 It is a partial enlarged view of the connecting shore portion of the axonometric drawing of the present invention;

[0014] Figure 5 It is an axonometric drawing of a single-segment grid body of the present invention;

[0015] Figure 6 It is a vertical cross-sectional view of the tubular sliding track of the present invention;

[0016] Figure 7 A top view of the top pivot of the tubular sliding track of the present invention;

[0017] Figure 8 This is a schematic diagram of the self-traction motion of the grid body of the present invention;

[0018] Figure 9 The images of the tension-to-charge ratio (F / P) and the arc-to-chord ratio (l / a) are drawn according to the formula. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0020] Please combine Figures 1 to 3 The figure shows a schematic diagram of the structure of an embodiment of the present invention. In this embodiment, the present invention mainly comprises a tubular sliding track 1, a pontoon-type grid chain 2, and a power unit. Each independent pontoon-type grid section is connected to form a pontoon-type grid chain 2 via a connecting hinge, which is then connected to the tubular sliding track 1 to form a movable, organic whole. The power unit realizes the self-traction function.

[0021] The tubular sliding track 1 is used as the fixed part of the entire sewage interception coarse screen. Figure 7 and Figure 8 As shown, the tubular sliding track 1 includes a track steel pipe 11 and a top pivot structure 12. The lower end of the track steel pipe 11 is fixedly integrated into the concrete structure on the shore. The top pivot structure 12 is fixed to the top of the track steel pipe 11. The top pivot structure 12 is consolidated with the concrete structure through a combination of two sets of tie rods 13 and anchor bars 14, further ensuring the stability of the tubular sliding track 1. The tubular sliding track is used to support and constrain the pontoon-type grid chain 2, and transfer the load acting on the pontoon-type grid chain 2 to the concrete foundation. At the same time, the pontoon-type grid chain 2 rises and falls freely along the tubular sliding track with the water level of the river, so as to always effectively intercept the coarse sewage that the sewage cleaning machine cannot handle, thereby ensuring the normal operation of the sewage cleaning machine equipment and pump station unit. See Figure 7 As shown, this application does not require multiple concrete partition foundations, which reduces the amount of concrete and steel used, which not only reduces the construction cost of new projects, but also facilitates the renovation of old projects.

[0022] Combine Figures 3 to 5 As shown, the floating length of the pontoon-type grid body chain 2 can be adjusted according to the actual situation of the water conservancy project. Each section of the pontoon-type grid body 21 is interchangeable and can adapt to the requirements of different working conditions. Figure 5 As shown, each section of the independent pontoon type grid body 21 is welded into a whole by two groups of floating structures. Each group of floating structures is welded by a pontoon 211, a frame without a bottom plate 212 and a group of grid bars 213. Figure 5 As shown, the buoyancy box 211 is located at the top, the frame 212 is located at the bottom, and the grid bars 213 are welded to the same side edge of the buoyancy box and the frame. The frame 212 includes a bottom and a side fixedly connected to the bottom, as shown in FIG. Figure 3 As shown. The two sets of floating structures are fixed relative to each other, and two sets of connecting lugs 214 are respectively provided between the opposing pontoons 211 and the frame 212. The connecting lugs 214 symmetrically connect the opposing pontoons 211 and the opposing frame 212 together, and are also used to connect to other components. The pontoon-type grid body 21 of the present application adopts a double pontoon structure on the upper part and no pontoon structure on the lower part, with a low center of gravity and a high center of buoyancy, and a stable posture in the water.

[0023] The connecting hinge includes an inter-segment connecting hinge 22 and a track connecting hinge 23. Figures 2 to 4 As shown, each section of the buoyancy box type grid body 21 is connected to the adjacent buoyancy box type grid body 21 through an inter-section connecting hinge 22 in conjunction with a fixing piece. That is, the inter-section connecting hinge 22 connects the two connecting ear plates 214 above and below the two adjacent buoyancy box type grid bodies 21. The double hinge connection limits the degree of freedom of the grid body, avoids accidental movements such as overturning and rolling of the grid body, and makes the grid body more stable when moving in the water. Through the connection of the inter-section connecting hinge 22, the degree of freedom of a single buoyancy box type grid body is limited. Two adjacent sections of the buoyancy box type grid body can only rotate relative to each other in the horizontal plane. Multiple sections of the buoyancy box type grid body are connected together to form a curve, which can swing freely under the action of bidirectional water flow. The connecting hinges of the bidirectional water flow self-traction hydraulic lifting sewage interception coarse screen are all detachable. Each section of the grid body and each hinge can be taken out separately without affecting the function of the remaining parts, which is convenient for maintenance.

[0024] The ends of the pontoon-type grid chain 2 are connected to the tubular sliding track 1 using a track connection hinge 23. The connection of the track connection hinge 23 is not locked, and the track connection hinge can move on the tubular sliding track 1 as the water level rises and falls, so that dirt can be blocked under any water level conditions.

[0025] The power unit includes a propeller propulsion mechanism 3, an automatic pin insertion and removal mechanism 4, and a remote control unit and energy storage unit combination 5. Figure 3 As shown, a propeller propulsion mechanism 3 can be provided on one section of the pontoon-type grid body 21, several sections of the pontoon-type grid body 21, or each section of the pontoon-type grid body 21. The propeller propulsion mechanism 3 can flexibly realize the movement of the pontoon-type grid body chain 2, that is, self-traction, so as to facilitate the collection and accumulation of intercepted pollutants for treatment, overcoming the problem of inconvenient garbage treatment of existing fixed grid bodies. Figure 3 As shown, a remote control unit and energy storage unit combination 5 is installed on the section of the pontoon-type boom 21 where the propeller propulsion mechanism 3 is installed. The remote control unit and energy storage unit combination 5 is installed on the upper side of the pontoon to prevent direct immersion by river water. The remote control unit and energy storage unit combination 5 can receive command signals to remotely control the propeller propulsion mechanism 3. At the same time, the energy storage unit supplies energy to the propeller propulsion mechanism 3 and the automatic threading and unthreading mechanism 4. Figures 2 to 4As shown, an automatic pinning and disengaging mechanism 4 is provided on one section of the buoyancy box type grid body 21 or several sections of the buoyancy box type grid body 21 or each section of the buoyancy box type grid body 21. The automatic pinning and disengaging mechanism 4 is an existing structure and will not be described in detail here. After receiving the instructions sent by the remote control unit and the energy storage unit combination 5, the automatic pinning and disengaging mechanism 4 automatically disengages from or combines with the inter-segment connection hinge of the adjacent buoyancy box type grid body 21, so that one or several sections of independently operating buoyancy box type grid bodies can be formed. Through the cooperation of the remote control unit and the energy storage unit combination 5 and the propeller pushing mechanism 3, the independently operating buoyancy box type grid body can be used to transport a large amount of pollutants to the designated treatment location, reducing the risk and difficulty of manual treatment.

[0026] The working principle of the present invention is described as follows:

[0027] The entire bidirectional, self-propelled, hydraulically raised, sewage interception coarse screen is divided into a fixed section and a movable section. The fixed section is a tubular sliding track, integrally connected to the concrete structure of the hydropower project, providing a track for the movable section to maintain position. The entire pontoon-type screen chain (2) is the movable section, moving up and down the track and deforming with the water flow to block large floating debris.

[0028] The entire pontoon-type boom chain 2 is composed of multiple sections of pontoon-type booms, each of which is connected by hinges. Each section of the pontoon-type boom is an independent structure. The pontoon-type boom floats on the water surface through the pontoon 211, while the bars 213 and the bottom frame 212 are below the water surface to intercept floating objects and provide stability.

[0029] Multiple sections of the pontoon boom 21 are interconnected to form a wide, chain-like structure, creating a curved intercepting surface under the action of the water flow. This curved intercepting surface changes with the direction of the water flow, adapting to bidirectional water flow. Due to the inherent stability of the pontoon boom and the constraints of the double hinges, the intercepting surface does not move or deflect beyond the permitted degrees of freedom, maintaining a stable working surface.

[0030] The pontoon-type fence chain 2 can move up and down on the tubular sliding track 1. The tubular sliding track 1 is long from the bottom of the water to the top of the bank wall, which can ensure that the pontoon-type fence chain 2 always blocks floating objects 1m to 2m below the water surface.

[0031] The tubular sliding track 1 is made of composite stainless steel tubes with cast concrete inside and is consolidated with the concrete foundation through upper and lower fulcrums, ensuring the strength, rigidity and stability of the tubular sliding track, which is sufficient to withstand the load from the grid body in the working position.

[0032] The inter-segment connection hinge 22 and the track connection hinge 23 both use engineering plastic alloy bushings and adopt a large clearance fit. Engineering plastic alloy has the advantages of self-lubrication, shock absorption, and high strength. The large clearance fit can avoid the active parts from getting stuck while meeting the requirements of the kinematic pair.

[0033] When the incoming sewage is too large and the accumulated sewage is too much, the operation and maintenance personnel can remotely issue instructions to the power device of the self-traction hydraulic lifting sewage interception coarse screen, and the automatic threading and unthreading mechanism 4 completes the unthreading, disconnects the chain link, and starts the propeller propulsion mechanism 3 to move the buoyancy box type screen body 21 along the Figure 8 The movement trajectory shown is pushed to the shore. At this time, the operation and maintenance personnel can centrally process the waste on the shore.

[0034] The main structural stress of the self-traction hydraulic lifting sewage interception coarse screen lies in the tension generated by the load acting on the sewage interception surface on the chain links, and the supporting load stress of the tubular sliding track.

[0035] The curve formed by the buoyancy box type grid chain 2 during operation is relatively complex. It can be simplified into a catenary or an arc during calculation. The approximate calculation formula for the maximum tension of its chain link is derived as follows:

[0036]

[0037] Where: F is the maximum tension in the chain link;

[0038] P——grid load (consistent with the uniform distribution assumption);

[0039] l - arc length, calculated length of chain link, equal to the sum of the center distances of all chain links;

[0040] a——chord length, the center distance between the two tube sliding tracks;

[0041] θ - the angle between the tangent line at the end of the catenary and the line connecting the centers of the two tracks;

[0042] According to the formula, the graph of tension-to-charge ratio (F / P) and arc-to-chord ratio (l / a) can be drawn as follows: Figure 9 As shown, the horizontal axis is the arc-chord ratio (l / a) and the vertical axis is the tension-load ratio (F / P).

[0043] According to the formula and graph, for a constant distance between the two banks and a constant uniformly distributed load, shorter chains increase the link tension and require a stronger structure. However, based on actual operating conditions, longer chains consume more material, require more space for pontoon-type boom chain 2, and increase costs. Taking into account both structural stress and economic efficiency, the arc-chord ratio (l / a) should be between 1.1 and 1.2.

[0044] In order to adapt to the bidirectional water flow of the bidirectional pumping station, the design of the present invention uses a dynamic simulation of the swinging action of the chain structure under bidirectional water flow. After repeated comparisons and optimizations, the length of the segmented link unit of the pontoon-type grid chain 2 (the distance between the center of the chain axis on the side of the grid body that is not connected to the hinge and the center of the chain axis on the side of the intersegment hinge that is not connected to the grid body) is taken as 1m. A certain angle is left between the pontoons of the two units to avoid mutual interference between the units due to changes in the pollution interception curve under the dynamic impact of water flow in different directions. The angle range can be 90°-270°, and the choice of the specific angle can be selected according to the actual design. For example, the angle is generally limited to 150°~210°. In scenarios where there is a need to limit movement, it can be designed to be limited to 170°~190°. In scenarios where there is a need for large-scale movement, it can be designed to be limited to 90°~270°. At the same time, the shorter link unit length allows the number of link segments to be freely increased or decreased. Only appropriate adjustments need to be made to the steel pipe embedded parts and the supporting concrete foundation. One set of designs can adapt to the different orifice widths of different hubs.

[0045] The coarse grid track is designed as a steel tube with two upper and lower anchor points, A and B. The pontoon-type grid chain 2 acts in the center, forming a simply supported structure that facilitates load bearing. Concrete is poured into the steel tube to form a concrete-filled steel tube column structure, which increases track rigidity and prevents movement jamming caused by track deformation.

[0046] The power device designed in the present invention utilizes the characteristics of the chain structure that can be broken and continued. A pin-on / off mechanism is set on a chain node far away from the shore (generally the connection node between the first section and the second section) to complete the chain breaking and continuing operations of the pontoon-type fence chain 2. At the same time, the present invention uses propeller power to replace the traditional wire rope traction to push the fence body. The propeller traction can always maintain a relative angle with the chain, while the wire rope traction can only be pulled in a certain fixed direction. The specific working mode of the power device of the present invention is designed as follows: the operation and maintenance personnel issue an instruction, the pin-on / off mechanism disconnects the chain, and then starts the propeller. The propulsion direction forms a certain angle with the forward direction. The component of the self-traction force along the tangential direction acts as the tension for unfolding the chain, and the component of the force perpendicular to the tangential direction pushes the pontoon-type fence chain 2 to rotate around an axis, gathering the dirt to the shore, such as Figure 8 shown.

[0047] The above embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. Equivalent changes and modifications made by those skilled in the art to the present invention should all fall within the scope of the claims appended hereto.

Claims

1. Bidirectional water flow self-traction hydraulic lifting sewage interception coarse screen, characterized by: include: Tubular sliding track, which is fixed on the shore; A pontoon-type boom chain is formed by connecting a plurality of pontoon-type boom sections, each of which is connected by an inter-segment connection hinge; at least one end of the pontoon-type boom chain is connected to the tubular sliding track by a track connection hinge, and the track connection hinge moves on the tubular sliding track as the water level rises and falls; At least one automatic pin-on / off mechanism, which is provided on the side of the floating box-type grid body and automatically connects or disconnects the inter-segment connection hinge at a corresponding position; A propeller propulsion mechanism, which is provided on at least one section of the buoyancy box-type grid body; A remote control unit and an energy storage unit combination is provided on the buoyancy box-type grid body provided with the propeller propulsion mechanism. The remote control unit and the energy storage unit combination sends control signals to the automatic pin insertion and removal mechanism and the propeller propulsion mechanism and provides energy.

2. The bidirectional water flow self-traction hydraulic lifting sewage interception coarse screen according to claim 1 is characterized in that: The structure of each section of the floating box type grid body includes: Two groups of floating structures, wherein the floating structures include: a pontoon located at the upper end; and A frame without a bottom plate at the bottom; a set of bars, both ends of which are fixedly connected to the same side edge of the buoyancy box and the frame; The two groups of floating structures are fixed together relative to each other, and two groups of connecting lugs are respectively provided between the relative buoyancy boxes and between the frames.

3. The bidirectional water flow self-traction hydraulic lifting sewage interception coarse screen according to claim 1 is characterized in that: The tubular sliding track comprises: Track steel pipes, the lower ends of which are fixed in the concrete structure; A top pivot structure is fixed to the top end of the track steel pipe, and the top pivot structure is consolidated with the concrete structure through a tie rod and a ground anchor bar.

Images