Unattended sewage interception system for the forebay of a pumping station and its use method

Abstract

The present invention discloses an unmanned trash interception system for a pump station forebay, comprising a pump station forebay, a water diversion pipe connected to the lower part of a concrete pool wall; a trash rack is connected to the left and right sides of the water diversion pipe on the inner surface of the concrete pool wall, and the other ends of the left trash rack and the right trash rack are hinged together; a water inlet area with an equilateral triangle in horizontal section is formed between the left and right trash racks and the concrete pool wall, a trash collecting box with a triangle in horizontal section is arranged in the water inlet area, the tops of the left and right side walls of the trash collecting box are respectively fixedly connected with flanged eaves, a discharge bridge is fixedly connected to the outer surface of the concrete pool wall, a garbage bin is arranged under the discharge bridge, and a lifting and transportation mechanism is arranged upward on the concrete pool wall of the pump station forebay. The present invention also discloses a method for using the above-mentioned unmanned trash interception system for a pump station forebay. The present invention has a simple structure, is easy to install, has a low cost, has a small resistance to intercepting trash, realizes unmanned operation, and can completely replace the existing high-cost trash cleaning machines and manual trash cleaning.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, and in particular to a pollution interception and cleaning technology for a pump station. Background Art

[0002] Trash racks installed in front of pump stations can prevent debris (mainly water plants and plastic bags) from entering the water pumps, ensuring the safe operation of the water pump units. Trash racks are generally flat and placed in front of the pump station inlet pool (as the water inlet flow channel of the pump station, i.e. the pump station forebay) at 75° or 90° to the water surface. For the pump stations of the South-to-North Water Diversion Project, the pump station forebay has the function of energy dissipation and rectification. The debris in front of the rack is mainly water plants and plastic bags. The specific gravity of water plants and plastic bags is less than that of the water body. They float on the water surface and first block the upper rack surface. If they are not removed in time, in the case of high flow rate, subsequent debris will easily sink into the water with the water flow and block the middle and lower rack surfaces. The head loss of the sewage will increase sharply, the pump head will increase, the flow rate will decrease, and for axial flow pumps and high specific speed mixed flow pumps, the pump shaft power will increase, and the efficiency of the pump station will decrease. When the water level at the suction port of the pump station drops too much, it will also cause cavitation of the pump, and in severe cases, the rack body will collapse. If the debris in front of the trash rack of the pump station is not cleared in time, the operating costs will increase significantly and affect the safe and stable operation of the pump unit.

[0003] Large pumping stations need to be equipped with a cleaning bridge and expensive cleaning machines. Small and medium-sized pumping stations generally do not have cleaning equipment and need manual cleaning, which is difficult, dangerous, and requires a lot of work. Yangzhou University's Chinese invention patent with publication number CN103510494B discloses a V-shaped trash rack, the top of which faces the water flow, and debris slides along the rack surface and floats on both sides of the river, requiring manual cleaning, which is very dangerous.

[0004] The cleaning equipment with circulating filter screen is convenient for lifting debris, but the cost is high. Therefore, the pump station forebay needs a sewage interception system with energy dissipation and rectification, small sewage interception resistance, low cost, and completely replacing sewage cleaning machines and manual sewage cleaning. Summary of the invention

[0005] The object of the present invention is to provide an unattended sewage interception system for a pump station forebay which has small sewage interception resistance, low cost, and is easy to use and can completely replace sewage cleaning machines and manual sewage cleaning.

[0006] To achieve the above-mentioned purpose, the unattended sewage interception system for the forebay of a pumping station of the present invention comprises a forebay of a pumping station, which is surrounded by a concrete pool wall; a water diversion pipe for introducing water into the forebay of the pumping station is connected to the lower part of the concrete pool wall, and the water diversion pipe is connected to the forebay of the pumping station;

[0007] The inner surface of the concrete pool wall is connected to a trash rack on the left and right sides of the water diversion pipe, respectively. The two trash racks are a left trash rack and a right trash rack, and the other ends of the left trash rack and the right trash rack are hinged together;

[0008] The left trash rack, the right trash rack and the inner surface of the concrete tank wall of the pump station forebay form a water inlet area with an equilateral triangle in horizontal section, and the water diversion pipe is connected to the water inlet area;

[0009] A sewage collecting box with a triangular horizontal cross section is provided in the water inlet area, and the sewage collecting box is surrounded by a left side wall, a right side wall, a rear side wall and a bottom plate; the rear side wall of the sewage collecting box faces the inner surface of the concrete pool wall and is adjacent to the inner surface of the concrete pool wall; one side edge of the bottom plate of the sewage collecting box is a hinged edge, and the hinged edge is hinged to the left side wall or the right side wall; a lifting ring is provided at the opposite side of the hinged edge of the bottom plate of the sewage collecting box; the left side wall of the sewage collecting box is adjacent to the left trash rack, and the right side wall of the sewage collecting box is adjacent to the right trash rack; the left side wall, the right side wall and the rear side wall of the sewage collecting box are all stainless steel meshes, and the bottom plate of the sewage collecting box is a grille plate;

[0010] The top of the left side wall and the top of the right side wall of the sewage collecting box are respectively fixedly connected with flanged retaining eaves, and the outer surface of the concrete pool wall of the pump station fore pool above the water diversion pipe is fixedly connected with a discharge bridge, which includes a left discharge bridge and a right discharge bridge, and the left discharge bridge and the right discharge bridge form a V-shaped discharge vertical groove adapted to the sewage collecting box;

[0011] The flanged eaves are used to hang the sewage collecting box on the left and right trash racks or on the left and right unloading bridges; a trash bin for holding debris dropped from the sewage collecting box is provided below the V-shaped unloading vertical chute, and the trash bin is fixedly connected to the outer surface of the concrete pool wall of the pump station fore pool; when the sewage collecting box is hung on the left and right trash racks, the bottom plate of the sewage collecting box is located in the middle and upper part of the trash racks; the top of the trash bin is open and the opening is larger than the bottom plate of the sewage collecting box;

[0012] A lifting and transporting mechanism for lifting the sewage collecting box to the left and right unloading bridge frames is arranged upward on the concrete pool wall of the pump station fore pool; the lifting and transporting mechanism has a lifting rope connected with a lifting ring.

[0013] A vertical track for lowering the trash rack when installing the trash rack is provided on both sides of the water diversion pipe on the concrete pool wall. The two vertical tracks are connected to the two trash racks one by one to form an equilateral triangle on the horizontal section. The left and right trash racks both include a frame made of I-beams, in which a plurality of horizontally arranged cross bars and vertically arranged flat irons are evenly arranged. The flat irons are connected to the cross bars and an angle α is formed between the flat irons and the cross bars, and α is 60 degrees.

[0014] With the direction pointing to the center of the water inlet area as the inward direction, the left trash rack and the right trash rack are both arranged to be inclined outward from bottom to top.

[0015] The lifting and transporting mechanism comprises a bracket installed on the concrete pool wall of the pump station fore pool, a crossbeam is installed on the top of the bracket, a guide rail is arranged on the crossbeam, one end of the guide rail is located above the water inlet area, and the other end of the guide rail is located above the V-shaped discharge vertical groove; a trolley is arranged on the guide rail, and the wheels of the trolley travel along the guide rail; the trolley is connected to a travel motor for driving the trolley;

[0016] The traveling trolley is connected downward with a winch, and the steel wire rope of the winch is connected downward with a lifting ring.

[0017] An ultrasonic water level sensor is provided in the forebay of the pump station outside the water inlet area; the ultrasonic water level sensor is connected to an electric control device, and the electric control device is connected to a power supply;

[0018] A trash-blocking travel switch and a discharge travel switch are provided on the guide rail; when the traveling trolley reaches the trash-blocking travel switch, it is located directly above the water inlet area; when the traveling trolley reaches the discharge travel switch, it is located directly above the V-shaped discharge vertical trough; the electric control device is connected to the traveling motor, winch, trash-blocking travel switch and discharge travel switch.

[0019] The present invention also aims to provide a method for using the above-mentioned unattended sewage interception system in the forebay of a pumping station, which is carried out according to the following steps:

[0020] The trash rack has a water-facing surface located in the water inlet area and a water-receiving surface located outside the water inlet area; when there is no debris attached to the trash rack, the water level in the water inlet area is the same as the water level in the forebay of the pump station outside the water inlet area and both are predetermined normal water levels;

[0021] The first is normal use, at this time, the garbage collecting box is hung on the left and right garbage racks through the flanged eaves, and the winch lowers the wire rope to rotate the bottom plate of the garbage collecting box downward to open;

[0022] The water introduced by the water diversion pipe continuously enters the water inlet area from the bottom. The water and the debris in the water impact the lower part of the inclined trash rack, generating an upward force. The water passes through the trash rack and enters the pump station forebay outside the trash rack and is pumped out. The debris floats up and enters the sewage collection box under the action of the upward force and buoyancy. After the debris adheres to the left and right walls of the sewage collection box, the resistance of the sewage collection box to water increases. After the sewage collection box is blocked, the water level in the pump station forebay on the back side of the trash rack drops.

[0023] The second is to pull up the dirt collection tank;

[0024] When the water level in the forebay of the pump station on the backwater side of the trash rack drops to the predetermined sewage removal level, the ultrasonic water level sensor sends a water level signal to the electronic control device, which turns on the winch and pulls up the lifting ring through the wire rope. The lifting ring pulls up the bottom plate of the sewage collecting box and rotates it to close. After the bottom plate is closed, the winch continues to pull up the bottom plate through the wire rope, and the entire sewage collecting box is lifted up. When the bottom plate of the sewage collecting box is higher than the forebay of the pump station and the left and right unloading bridges, the third step is carried out.

[0025] The third is to transport the sewage collection box to the left and right unloading bridges;

[0026] The electric control device controls the winch to keep the wire rope in the raised position, turns on the travel motor, and moves the travel trolley along the guide rail toward the V-shaped discharge vertical slot. When the travel trolley touches the discharge travel switch, the travel motor is turned off, the winch starts, and the wire rope is lowered, so that the flanged eaves of the dirt collection box are hung on the left and right discharge bridges. At this time, the dirt collection box is located in the V-shaped discharge vertical slot.

[0027] The winch continues to lower the wire rope, and the garbage collecting box as a whole stops falling. The bottom plate of the garbage collecting box rotates downward and opens under the action of gravity, and the debris in the garbage collecting box falls into the garbage bin.

[0028] Keep the bottom plate of the dirt collecting box in the open state for 10 to 30 seconds, and then proceed to the fourth step;

[0029] The fourth is to transport the sewage collection box back to the top of the water inlet area;

[0030] The electric control device controls the winch to pull up the wire rope, so that the bottom plate of the sewage collection box rotates upward and closes; then as the wire rope continues to be pulled up, the sewage collection box rises upward; when the bottom plate of the sewage collection box is higher than the forebay of the pump station and the left and right unloading bridges, the winch maintains the pulled position of the wire rope, turns on the travel motor, and moves the travel trolley along the guide rail toward the water inlet area; when the travel trolley touches the sewage blocking travel switch, the travel motor is turned off, the winch starts and lowers the wire rope, so that the flanged eaves of the sewage collection box are hung on the left and right trash racks; the winch continues to lower the wire rope, and at this time the bottom plate of the sewage collection box rotates downward and opens, thereby restoring the normal working state;

[0031] Repeat the first to fourth steps to cycle through the process of collecting, transporting, unloading and resetting the waste.

[0032] A vibration motor is provided on the left unloading bridge and / or the right unloading bridge; in the third step, after the bottom plate of the dirt collecting box is opened, the vibration motor is started to promote the falling of debris in the dirt collecting box through vibration to prevent the debris from adhering to the dirt collecting box.

[0033] The present invention has the following advantages:

[0034] The present invention sets the water inlet area so that all the water in the pump station forebay must pass through the left trash rack, the right trash rack or the trash collecting box before entering other areas of the pump station forebay, thereby preventing unfiltered water from being directly pumped out by the pump station and ensuring water quality.

[0035] Since the density of debris in the water is lower than that of water (debris with a density higher than that of water will not be transported long distances by the river), the trash collecting box in the present invention is only located at the upper part of the water inlet area when in use. After the debris entering the water inlet area impacts the lower part of the inclined trash rack, it naturally moves upward into the trash collecting box under the action of buoyancy and upward force, so that the debris can naturally enter the box instead of being attached to the outside of the box, which provides a basis for collecting and transporting the debris.

[0036] The present invention can conveniently lift the dirt collecting box through the lifting and transportation mechanism, and automatically close and open the bottom plate of the dirt collecting box during lifting, which is very convenient to use. The dirt blocking travel switch and the unloading travel switch can accurately locate the position of the dirt collecting box, so that the dirt collecting box can be accurately hung on the left and right trash racks or the left and right unloading bridges.

[0037] The vertical track is set up to facilitate the lowering of the trash rack when it is installed in the forebay of the pump station. The left and right trash racks are both set up tilted outward from bottom to top. When the incoming water carrying debris hits the trash rack, it will generate an upward force, thus avoiding the debris directly hanging on the lower part of the trash rack and unable to float up, greatly improving the floating rate of the debris.

[0038] The lifting and transporting mechanism has a simple structure and reliable operation, and is easy to install at the forebay of the pump station. The top of the garbage bin is open and the opening is larger than the bottom plate of the sewage collection box, so that the debris in the sewage collection box can fall completely into the garbage bin. The debris in the garbage bin is regularly removed by the sanitation vehicle.

[0039] The vertical track for lowering the trash rack when installing it is made of two channel steels, which are fixed in the concrete door grooves reserved in the pool wall and can also be used as maintenance door grooves.

[0040] The left trash rack, the right trash rack and the inner surface of the concrete pool wall of the pump station forebay form a water inlet area with an equilateral triangle (V-shaped) horizontal cross-section. It is installed at the outlet of the water diversion pipe to dissipate energy.

[0041] The direction of each galvanized flat iron is parallel to the direction of water flow, which has a rectifying effect. The trash rack supports the trash collection box. According to the characteristics of the equilateral triangle, the width of the two trash racks is equal to the width of the door slot. When repairing one of the trash racks, the other trash rack can be inserted into the door slot to temporarily block the trash.

[0042] The bottom plate of the dirt collecting box automatically opens and closes according to the lifting and lowering of the lifting ring (the bottom plate opens when the lifting ring is lowered, and the bottom plate closes when the lifting ring is pulled upward), realizing the functions of collecting debris and transporting the dirt collecting box.

[0043] The water level is monitored by an ultrasonic sensor so that the second to fourth steps can be started in time, and the timeliness of the cleaning is effectively guaranteed.

[0044] The comprehensive cost of manufacturing, installing and using the present invention is reduced by 90% compared with the conventional filter screen circulating rotating garbage cleaning machine, and has more practical promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic elevational layout diagram of the unattended sewage interception system for the forebay of a pump station according to the present invention;

[0046] Figure 2 The intermediate trash tank is located in the water inlet area surrounded by the trash rack. Figure 2 The middle trash rack should cover the trash box. In order to clearly express the upper and lower positions of the trash box, Figure 2 The trash rack is hidden at the trash collecting box; Figure 2 The middle flange eave 13 is hung on the top of the trash rack;

[0047] Figure 2 It is a schematic diagram of the plan layout of the unattended sewage interception system of the pump station forebay of the present invention;

[0048] Figure 3 yes Figure 2 An enlarged schematic diagram of the middle water inlet area;

[0049] Figure 4 This is a schematic diagram of the structure of the dirt collecting box when the bottom plate is closed;

[0050] Figure 5 This is a schematic diagram of the structure of the dirt collecting box when the bottom plate is opened;

[0051] Figure 6 It is the electric control principle diagram of the present invention;

[0052] Figure 7 It is a schematic diagram of the structure of the trash rack;

[0053] Figure 8 yes Figure 7 The enlarged view of point A in the middle;

[0054] Figure 1 and Figure 5 The direction indicated by the arrow is the overall flow direction of the water at that location. DETAILED DESCRIPTION

[0055] like Figures 1 to 8 As shown, the unattended sewage interception system of the pump station forebay of the present invention comprises a pump station forebay 2, which is surrounded by a concrete pool wall 1; a water diversion pipe 3 (culvert) for introducing water into the pump station forebay 2 is connected to the lower part of the concrete pool wall 1, and the water diversion pipe 3 is connected to the pump station forebay 2;

[0056] The inner surface of the concrete pool wall 1 is connected to a trash rack on the left and right sides of the water diversion pipe 3, respectively. The two trash racks are a left trash rack 4 and a right trash rack 5, and the other ends of the left trash rack 4 and the right trash rack 5 are hinged together.

[0057] The left trash rack 4, the right trash rack 5 and the inner surface of the concrete pool wall 1 of the pump station fore pool 2 form a water inlet area 6 with an equilateral triangle in horizontal cross section; the water diversion pipe 3 is connected to the water inlet area 6;

[0058] A dirt collecting box 7 with a triangular horizontal cross section is provided in the water inlet area 6, and the dirt collecting box 7 is surrounded by a left side wall 8, a right side wall 9, a rear side wall 10 and a bottom plate 11; the rear side wall 10 of the dirt collecting box 7 faces the inner surface of the concrete pool wall 1 and is adjacent to the inner surface of the concrete pool wall 1; one side edge of the bottom plate 11 of the dirt collecting box 7 is a hinged edge, and the hinged edge is hinged to the left side wall 8 or the right side wall 9; a lifting ring 12 is provided at the opposite side of the hinged edge of the bottom plate 11 of the dirt collecting box 7; the left side wall 8 of the dirt collecting box 7 is adjacent to the left trash rack 4, and the right side wall 9 of the dirt collecting box 7 is adjacent to the right trash rack 5; the left side wall 8, the right side wall 9 and the rear side wall 10 of the dirt collecting box 7 are all stainless steel meshes, and the bottom plate 11 of the dirt collecting box 7 is a grille plate;

[0059] The top of the left side wall 8 and the top of the right side wall 9 of the sewage collecting box 7 are respectively fixedly connected with a flanged retaining eave 13, and the outer surface of the concrete pool wall 1 of the pump station fore pool 2 above the water diversion pipe 3 is fixedly connected with a discharge bridge, which includes a left discharge bridge 14 and a right discharge bridge 15, and the left discharge bridge 14 and the right discharge bridge 15 surround a V-shaped discharge vertical groove 16 adapted to the sewage collecting box 7;

[0060] The flanged eaves 13 are used to hang the sewage collecting box 7 on the left and right trash racks 4, 5 or the left and right unloading bridges 14, 15; a trash bin 17 for holding debris dropped from the sewage collecting box 7 is provided below the V-shaped unloading vertical chute 16, and the trash bin 17 is fixedly connected to the outer surface of the concrete pool wall 1 of the pump station fore pool 2; when the sewage collecting box 7 is hung on the left and right trash racks 4, 5, the bottom plate 11 of the sewage collecting box 7 is located in the middle and upper part of the trash racks; the top of the trash bin 17 is open and the opening is larger than the bottom plate 11 of the sewage collecting box 7;

[0061] The concrete pool wall 1 of the pump station forebay 2 is provided with a lifting and transporting mechanism upward for lifting the sewage collecting box 7 to the left and right unloading bridges 14 and 15 ; the lifting and transporting mechanism has a lifting rope connected to the lifting ring 12 .

[0062] On the concrete pool wall 1, a vertical track 18 for lowering the trash rack when installing the trash rack is provided on both sides of the water diversion pipe 3. The two vertical tracks 18 are connected to the two trash racks one by one, forming an equilateral triangle in the horizontal section. The left and right trash racks 4 and 5 both include a frame made of I-beams 35, and a plurality of horizontally arranged cross bars 36 and vertically arranged flat irons 37 are evenly arranged in the frame. The flat irons 37 are connected to each cross bar 36 and there is an angle α between the flat irons 37 and the cross bar 36, and α is 60 degrees. When the trash rack of this structure is in use, the direction of each galvanized flat iron 37 is basically parallel to the direction of water flow, thereby playing a role in rectification. The setting of the vertical track 18 facilitates the lowering of the trash rack when the trash rack is installed in the forebay 2 of the pump station.

[0063] With the direction pointing to the center of the water inlet area 6 as the inward direction, the left trash rack and the right trash rack are both arranged to be inclined outward from bottom to top.

[0064] In this way, the incoming water carrying debris will generate an upward component force when impacting the trash rack, thereby preventing the debris from being directly hung on the lower part of the trash rack and unable to float up, thereby greatly improving the floating rate of the debris.

[0065] The lifting and transporting mechanism comprises a bracket 19 installed on the concrete pool wall 1 of the pump station fore pool 2, a crossbeam 20 (the crossbeam 20 is preferably made of I-beam 35) is installed on the top of the bracket 19, a guide rail 21 is provided on the crossbeam 20, one end of the guide rail 21 is located above the water inlet area 6, and the other end of the guide rail 21 is located above the V-shaped discharge vertical groove 16; a walking trolley 22 is provided on the guide rail 21, and the wheels 23 of the walking trolley 22 travel along the guide rail 21; the walking trolley 22 is connected to a walking motor 24 for driving the walking trolley 22;

[0066] The traveling trolley 22 is connected downwardly with a winch 25 , which can be replaced by a motor and a steel wire rope wound around the motor shaft; the steel wire rope 26 of the winch 25 is connected downwardly to the lifting ring 12 .

[0067] An ultrasonic water level sensor 27 is provided in the pump station forebay 2 outside the water inlet area 6; the ultrasonic water level sensor 27 is connected to an electronic control device 28.

[0068] A trash-blocking travel switch 29 and a discharge travel switch 30 are provided on the guide rail 21; when the traveling trolley 22 reaches the trash-blocking travel switch 29, it is located directly above the water inlet area 6; when the traveling trolley 22 reaches the discharge travel switch 30, it is located directly above the V-shaped discharge vertical groove 16; the electronic control device 28 is connected to the traveling motor 24, the winch 25, the trash-blocking travel switch 29 and the discharge travel switch 30.

[0069] The electric control device 28 can be a PLC, a single chip microcomputer, an integrated circuit, a desktop computer, or a notebook computer. The electric control device 28 is connected to a power supply 31 .

[0070] The present invention also discloses a method for using the unattended sewage interception system in the forebay of a pump station, which is performed according to the following steps:

[0071] The trash rack has a water-facing surface located in the water inlet area 6 and a water-receiving surface located outside the water inlet area 6; when there is no debris attached to the trash rack, the water level in the water inlet area 6 is the same as the water level in the pump station forebay 2 outside the water inlet area 6 and both are the predetermined normal water level 33;

[0072] The first is normal use, at which time the dirt collecting box 7 is hung on the left and right trash racks 4 and 5 through the flanged eaves 13, and the winch 25 lowers the wire rope 26 to rotate the bottom plate 11 of the dirt collecting box 7 downward to open;

[0073] The water introduced by the water diversion pipe 3 continuously enters the water inlet area 6 from the bottom. The water and the debris in the water impact the lower part of the inclined trash rack and generate an upward component force. The water enters the pump station forebay 2 outside the trash rack through the trash rack and is pumped out. The debris floats up and enters the trash collection box 7 under the action of the upward component force and buoyancy. After the debris adheres to the left side wall 8 and the right side wall 9 (both are grille plates) of the trash collection box 7, the resistance of the trash collection box 7 to water increases. After the trash collection box is blocked, the water level in the pump station forebay 2 on the back side of the trash rack drops.

[0074] The second is to pull up the dirt collecting box 7;

[0075] When the water level in the pump station forebay 2 on the backwater side of the trash rack drops to the predetermined sewage removal level 34, the ultrasonic water level sensor 27 sends a water level signal to the electronic control device 28, and the electronic control device 28 turns on the hoist 25, pulls up the lifting ring 12 through the wire rope 26, and the lifting ring 12 pulls up the bottom plate 11 of the trash collecting box 7 so that it rotates and closes; after the bottom plate 11 is closed, the hoist 25 continues to pull up the bottom plate 11 through the wire rope 26, and the entire trash collecting box 7 is pulled up; when the bottom plate 11 of the trash collecting box 7 is higher than the pump station forebay 2 and the concrete pool wall 1 and the left and right unloading bridges 14 and 15, the third step is performed;

[0076] The third is to transport the dirt collecting box 7 to the left and right unloading bridges 14 and 15;

[0077] The electric control device 28 controls the hoist 25 to maintain the raised position of the steel wire rope 26, turns on the travel motor 24, and moves the travel trolley 22 along the guide rail 21 toward the V-shaped discharge vertical groove 16. When the travel trolley 22 touches the discharge travel switch 30, the travel motor 24 is turned off, the hoist 25 is started and the steel wire rope 26 is lowered, so that the flanged eaves 13 of the dirt collecting box 7 are hung on the left and right discharge bridges 14 and 15. At this time, the dirt collecting box 7 is located in the V-shaped discharge vertical groove 16.

[0078] The winch 25 continues to lower the wire rope 26, and the dirt collecting box 7 as a whole no longer falls. The bottom plate 11 of the dirt collecting box 7 rotates downward and opens under the action of gravity, and the debris in the dirt collecting box 7 falls into the trash bin 17.

[0079] After keeping the bottom plate 11 of the dirt collecting box 7 in the open state for 10 to 30 seconds, proceed to the fourth step;

[0080] The fourth step is to transport the dirt collecting box 7 back to the top of the water inlet area 6;

[0081] The electric control device 28 controls the winch 25 to pull up the steel wire rope 26, so that the bottom plate 11 of the sewage collecting box 7 rotates upward and closes; then, as the steel wire rope 26 continues to be pulled up, the sewage collecting box 7 rises upward; when the bottom plate 11 of the sewage collecting box 7 is higher than the fore pool 2 and the concrete pool wall 1 of the pump station and the left and right unloading bridges 14 and 15, the winch 25 maintains the pulled-up position of its steel wire rope 26, and the travel motor 24 is turned on to make the travel trolley 22 move along the guide rail 21 toward the water inlet area 6; when the travel trolley 22 touches the sewage blocking travel switch 29, the travel motor 24 is turned off, the winch 25 is started and the steel wire rope 26 is lowered, so that the flanged eaves 13 of the sewage collecting box 7 are hung on the left and right garbage racks 4 and 5; the winch 25 continues to lower the steel wire rope 26, and at this time, the bottom plate 11 of the sewage collecting box 7 rotates downward and opens, thereby restoring the normal working state;

[0082] Repeat the first to fourth steps to cycle through the process of collecting dirt (the first step), transporting dirt (the second and third steps), unloading dirt (the third step) and resetting (the fourth step).

[0083] A vibration motor 32 is provided on the left unloading bridge 14 and / or the right unloading bridge 15; the vibration motor 32 is connected to the electric control device. In the third step, after the bottom plate 11 of the dirt collecting box 7 is opened, the vibration motor 32 is started to promote the falling of the debris in the dirt collecting box 7 through vibration to prevent the debris from adhering to the dirt collecting box 7.

[0084] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The unattended sewage interception system of the pump station forebay includes a pump station forebay surrounded by a concrete pool wall; a water diversion pipe for introducing water into the pump station forebay is connected to the lower part of the concrete pool wall, and the water diversion pipe is connected to the pump station forebay; Features: The inner surface of the concrete pool wall is connected to a trash rack on the left and right sides of the water diversion pipe, respectively. The two trash racks are a left trash rack and a right trash rack, and the other ends of the left trash rack and the right trash rack are hinged together; The left trash rack, the right trash rack and the inner surface of the concrete tank wall of the pump station forebay form a water inlet area with an equilateral triangle in horizontal section, and the water diversion pipe is connected to the water inlet area; A sewage collecting box with a triangular horizontal cross section is provided in the water inlet area, and the sewage collecting box is surrounded by a left side wall, a right side wall, a rear side wall and a bottom plate; the rear side wall of the sewage collecting box faces the inner surface of the concrete pool wall and is adjacent to the inner surface of the concrete pool wall; one side edge of the bottom plate of the sewage collecting box is a hinged edge, and the hinged edge is hinged to the left side wall or the right side wall; a lifting ring is provided at the opposite side of the hinged edge of the bottom plate of the sewage collecting box; the left side wall of the sewage collecting box is adjacent to the left trash rack, and the right side wall of the sewage collecting box is adjacent to the right trash rack; the left side wall, right side wall and rear side wall of the sewage collecting box are all stainless steel meshes, and the bottom plate of the sewage collecting box is a grille plate; The top of the left side wall and the top of the right side wall of the sewage collecting box are respectively fixedly connected with flanged retaining eaves, and the outer surface of the concrete pool wall of the pump station fore pool above the water diversion pipe is fixedly connected with a discharge bridge, which includes a left discharge bridge and a right discharge bridge, and the left discharge bridge and the right discharge bridge form a V-shaped discharge vertical groove adapted to the sewage collecting box; The flanged eaves are used to hang the sewage collecting box on the left and right trash racks or on the left and right unloading bridges; a trash bin for holding debris dropped from the sewage collecting box is provided below the V-shaped unloading vertical chute, and the trash bin is fixedly connected to the outer surface of the concrete pool wall of the pump station fore pool; when the sewage collecting box is hung on the left and right trash racks, the bottom plate of the sewage collecting box is located in the middle and upper part of the trash racks; the top of the trash bin is open and the opening is larger than the bottom plate of the sewage collecting box; A lifting and transporting mechanism is provided upwardly on the concrete pool wall of the pump station fore pool for lifting the sewage collecting box to the left and right unloading bridges; the lifting and transporting mechanism has a lifting rope connected to a lifting ring; A vertical track for lowering the trash rack when installing the trash rack is provided on both sides of the water diversion pipe on the concrete pool wall. The two vertical tracks are connected to the two trash racks one by one, forming an equilateral triangle on the horizontal section. The left and right trash racks both include a frame made of I-beams, and a plurality of horizontally arranged cross bars and vertically arranged flat irons are evenly arranged in the frame. The flat irons are connected to the cross bars and an angle α is formed between the flat irons and the cross bars, and α is 60 degrees. With the direction pointing to the center of the water inlet area as the inward direction, the left trash rack and the right trash rack are both arranged to be inclined outward from bottom to top.

2. The unattended sewage interception system for the pump station forebay according to claim 1 is characterized by: The lifting and transporting mechanism comprises a bracket installed on the concrete pool wall of the pump station fore pool, a crossbeam is installed on the top of the bracket, a guide rail is arranged on the crossbeam, one end of the guide rail is located above the water inlet area, and the other end of the guide rail is located above the V-shaped discharge vertical groove; a trolley is arranged on the guide rail, and the wheels of the trolley travel along the guide rail; the trolley is connected to a travel motor for driving the trolley; The traveling trolley is connected downward with a winch, and the steel wire rope of the winch is connected downward with a lifting ring.

3. The unattended sewage interception system for the pump station forebay according to claim 2 is characterized by: An ultrasonic water level sensor is provided in the forebay of the pump station outside the water inlet area; the ultrasonic water level sensor is connected to an electric control device, and the electric control device is connected to a power supply; A trash-blocking travel switch and a discharge travel switch are provided on the guide rail; when the traveling trolley reaches the trash-blocking travel switch, it is located directly above the water inlet area; when the traveling trolley reaches the discharge travel switch, it is located directly above the V-shaped discharge vertical trough; the electric control device is connected to the traveling motor, winch, trash-blocking travel switch and discharge travel switch.

4. The method for using the unattended sewage interception system for the forebay of a pumping station as claimed in claim 3 is characterized in that Follow these steps: The trash rack has a water-facing surface located in the water inlet area and a water-receiving surface located outside the water inlet area; when there is no debris attached to the trash rack, the water level in the water inlet area is the same as the water level in the forebay of the pump station outside the water inlet area and both are predetermined normal water levels; The first is normal use, at this time the dirt collecting box is hung on the left and right trash racks through the flanged eaves, and the winch lowers the wire rope to rotate the bottom plate of the dirt collecting box downward to open; The water introduced by the water diversion pipe continuously enters the water inlet area from the bottom. The water and the debris in the water impact the lower part of the inclined trash rack, generating an upward force. The water passes through the trash rack and enters the pump station forebay outside the trash rack and is pumped out. The debris floats up and enters the sewage collection box under the action of the upward force and buoyancy. After the debris adheres to the left and right walls of the sewage collection box, the resistance of the sewage collection box to water increases. After the sewage collection box is blocked, the water level in the pump station forebay on the back side of the trash rack drops. The second is to pull up the dirt collection tank; When the water level in the forebay of the pump station on the backwater side of the trash rack drops to the predetermined sewage removal level, the ultrasonic water level sensor sends a water level signal to the electronic control device, which turns on the winch and pulls up the lifting ring through the wire rope. The lifting ring pulls up the bottom plate of the sewage collecting box and rotates it to close. After the bottom plate is closed, the winch continues to pull up the bottom plate through the wire rope, and the entire sewage collecting box is lifted up. When the bottom plate of the sewage collecting box is higher than the forebay of the pump station and the left and right unloading bridges, the third step is carried out. The third is to transport the sewage collection box to the left and right unloading bridges; The electric control device controls the winch to keep the wire rope in the raised position, turns on the travel motor, and moves the travel trolley along the guide rail toward the V-shaped discharge vertical slot. When the travel trolley touches the discharge travel switch, the travel motor is turned off, the winch starts, and the wire rope is lowered, so that the flanged eaves of the dirt collection box are hung on the left and right discharge bridges. At this time, the dirt collection box is located in the V-shaped discharge vertical slot. The winch continues to lower the wire rope, and the garbage collecting box as a whole stops falling. The bottom plate of the garbage collecting box rotates downward and opens under the action of gravity, and the debris in the garbage collecting box falls into the garbage bin. Keep the bottom plate of the dirt collecting box in the open state for 10 to 30 seconds, and then proceed to the fourth step; The fourth is to transport the sewage collection box back to the top of the water inlet area; The electric control device controls the winch to pull up the wire rope, so that the bottom plate of the sewage collection box rotates upward and closes; then as the wire rope continues to be pulled up, the sewage collection box rises upward; when the bottom plate of the sewage collection box is higher than the forebay of the pump station and the left and right unloading bridges, the winch maintains the pulled position of the wire rope, turns on the travel motor, and moves the travel trolley along the guide rail toward the water inlet area; when the travel trolley touches the sewage blocking travel switch, the travel motor is turned off, the winch starts and lowers the wire rope, so that the flanged eaves of the sewage collection box are hung on the left and right trash racks; the winch continues to lower the wire rope, and at this time the bottom plate of the sewage collection box rotates downward and opens, thereby restoring the normal working state; Repeat the first to fourth steps to cycle through the process of collecting, transporting, unloading and resetting the waste.

5. The method of use according to claim 4, characterized in that: A vibration motor is provided on the left unloading bridge and / or the right unloading bridge; in the third step, after the bottom plate of the dirt collecting box is opened, the vibration motor is started to promote the falling of debris in the dirt collecting box through vibration to prevent the debris from adhering to the dirt collecting box.

Images