A grid performance testing system and method

Abstract

The present invention relates to a grille performance test system and method. The present invention includes a test channel, the test channel includes a water inlet area, a grille installation area and a water collection area; a screen residue premixing water tank, the screen residue premixing water tank is provided with an agitator inside, and the water inlet area is connected to the screen residue premixing water tank; a screen residue dosing machine is connected to the screen residue premixing water tank, and is used to add screen residue into the screen residue premixing water tank; a variable frequency lifting pump, the water inlet end of the variable frequency lifting pump is connected to the water collection area through a water outlet pipe I, and the water outlet end of the variable frequency lifting pump is connected to the screen residue premixing water tank through a water upper pipe; a variable frequency backwashing pump, the water inlet end of the variable frequency backwashing pump is connected to the water collection area through a water outlet pipe II, and a water outlet valve II is provided on the water outlet pipe II, and the water outlet end of the variable frequency backwashing pump is connected to the backwashing water inlet pipe. The present invention can meet the test of multiple performance indicators of different types of grilles.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a grid performance testing system and method. Background Art

[0002] As the primary link in rainwater and sewage treatment, the screens are mainly used to intercept inert impurities such as suspended matter, rubber and plastic products, hair, plant fibers, etc. in rainwater and sewage. The operating performance of the screens will directly affect the operating results of subsequent units, the service life of the equipment, and the overall process efficiency, and puts higher requirements on the products of (ultra) fine screens.

[0003] According to the water flow direction of the grid plate and whether the grid plate rotates during the operation of the grid, the (ultra) fine grid is divided into two categories. One is the (ultra) fine grid with fixed grid plates, such as a large flux ultra-fine grid system with non-rotating grid plates (patent number: CN202311167296.1), and the intercepted screen residue is scraped off by a scraper; the other is the (ultra) fine grid with rotating grid plates, such as the internal inlet (ultra) fine grid, and the intercepted screen residue is removed by backwashing. At present, the differences in water flux, water flow capacity under different screen residue amounts, flux attenuation and other indicators of the above two types of (ultra) fine grids are unknown, which brings difficulties to the selection and configuration of the two types of (ultra) fine grids in specific engineering applications.

[0004] Therefore, it is urgent to develop a comprehensive testing platform that can scientifically and accurately test indicators such as water flux, water flow capacity, flux attenuation, and screen residue interception efficiency of fixed-grid and rotating-grid screens, thereby providing support for the improvement of the performance of different types of (ultra) fine screens and the selection and configuration of (ultra) fine screens in different application scenarios and different application scales. Summary of the invention

[0005] To this end, the present invention provides a grille performance testing system and method, which can meet the testing of multiple performance indicators of different types of grilles.

[0006] In order to solve the above technical problems, the present invention provides a grid performance testing system, comprising:

[0007] A test channel, the test channel comprising a water inlet area, a grille installation area and a water collection area; wherein the water collection area is provided with a water collection port, a water injection port and an emptying pipe I, and an emptying valve I is provided on the emptying pipe I;

[0008] A screens premixing water tank, wherein an agitator is arranged inside the screens premixing water tank, the water inlet area is connected with the screens premixing water tank, the screens premixing water tank is provided with an emptying pipe II, and the emptying pipe II is provided with an emptying valve II; wherein the water inlet area is connected with the screens premixing water tank through an inlet pipe, a control valve II is arranged on the inlet pipe, the inlet pipe is further connected with an inlet branch pipe and an overrunning pipe, respectively, the inlet branch pipe is provided with a control valve III, and the overrunning pipe is provided with a control valve IV;

[0009] A screenings feeder connected to the screenings premix water tank and used for feeding screenings into the screenings premix water tank;

[0010] A variable frequency lifting pump, wherein the water inlet end of the variable frequency lifting pump is connected to the water catchment area through a water outlet pipe I, and the water outlet end of the variable frequency lifting pump is connected to the screen residue premixing water tank through an upper water pipe; wherein a water outlet valve I is provided on the water outlet pipe I, and an electromagnetic flowmeter and a control valve I are provided on the upper water pipe; the upper water pipe is connected to the water inlet pipe through the transcending pipe;

[0011] A variable frequency backwash pump, wherein the water inlet end of the variable frequency backwash pump is connected to the water collection area through a water outlet pipe II, a water outlet valve II is arranged on the water outlet pipe II, and the water outlet end of the variable frequency backwash pump is connected to the backwash water inlet pipe.

[0012] In one embodiment of the present invention, the tops of the water inlet area and the grille installation area are respectively open structures, and the top of the water collection area is a sealed structure.

[0013] In one embodiment of the present invention, the water inlet area is provided with an ultrasonic liquid level meter I, and the water collection area is provided with an ultrasonic liquid level meter II.

[0014] In one embodiment of the present invention, the screen residue feeding machine includes a support frame and a screen residue storage box, a variable frequency drive motor, a transmission roller, a roller, a conveyor belt and a discharge port respectively arranged on the support frame; the conveyor belt is connected to the transmission roller, the variable frequency drive motor drives the transmission roller to move to drive the conveyor belt to move, the roller is used to support the movement of the conveyor belt, and the discharge port is connected to the screen residue premix water tank.

[0015] In one embodiment of the present invention, it also includes a screening slag press, which includes a machine body and a slag inlet hopper, a reduction motor, a screw shaft, a water collection trough and a slag outlet respectively arranged on the machine body, the slag inlet hopper and the slag outlet are respectively located on one side of the two ends of the screw shaft, the reduction motor is used to drive the screw shaft to rotate, and the water collection trough is located below the screw shaft.

[0016] In one embodiment of the present invention, the water collection trough is connected to an emptying pipe III, the slag inlet hopper is connected to a screen slag conveying pipe leading to the screen installation area, and the slag outlet is connected to a screen slag collecting bucket.

[0017] The present invention also provides a grille performance testing method, characterized in that, using the grille performance testing system, the testing method comprises:

[0018] Installing the grid plate fixed type grille to be tested on the top of the water collection area, and connecting the water inlet and the water outlet of the grid plate fixed type grille to the water inlet branch pipe and the water collection port respectively;

[0019] Controlling to close the drain valve I, and injecting clean water into the test channel through the water injection port;

[0020] respectively controlling to open the outlet valve I, the control valve III and the control valve IV, and respectively controlling to close the control valve I and the control valve II;

[0021] Controlling and starting the variable frequency lifting pump, the variable frequency lifting pump lifts the clean water in the test channel through the outlet pipe, the upper water pipe, the overrunning pipe, the inlet pipe and the inlet branch pipe, and then lifts it into the water inlet of the fixed grid type grille, and the clean water flows through the grid of the fixed grid type grille and then flows into the water catchment area through the water catchment port;

[0022] According to the real-time flow data collected by the electromagnetic flowmeter, the maximum clean water flux of the grid plate fixed type grid is obtained.

[0023] The present invention also provides a grille performance testing method, using the grille performance testing system, the testing method comprises:

[0024] Install the grid plate fixed type grille to be tested on the top of the water collection area, and connect the water inlet and water outlet of the grid plate fixed type grille to the water inlet branch pipe and the water collection port respectively;

[0025] Controlling to close the drain valve I, and injecting clean water into the test channel through the water injection port;

[0026] Respectively control the opening of the water outlet valve I, the control valve I and the control valve III, and respectively control the closing of the control valve II, the control valve IV and the drain valve II;

[0027] Controlling and starting the variable frequency lifting pump, the clean water in the test channel is lifted by the variable frequency lifting pump through the water outlet pipe and the water supply pipe and then enters the screen residue premixing water tank, and starting the agitator;

[0028] Starting the screenings feeder to feed screenings into the screenings premix water tank, and adjusting the amount of screenings fed by adjusting the operating frequency of the variable frequency drive motor;

[0029] After the clean water and the screenings in the screenings premixing water tank are fully stirred and mixed by the stirrer, they enter the water inlet of the fixed-grid grille through the water inlet pipe and the water inlet branch pipe, the screenings are intercepted by the grid of the fixed-grid grille, and the clean water flows into the water catchment area through the water catchment port, and the screenings on the grid are scraped by the scraper of the fixed-grid grille to the screenings press, and then discharged into the screenings collection bucket after being squeezed by the screenings press;

[0030] The water flow capacity of the fixed grid type grid under different grid residue dosages is calculated based on the real-time flow data collected by the electromagnetic flow meter.

[0031] The present invention also provides a grille performance testing method, using the grille performance testing system, the testing method comprises:

[0032] Install the grating plate rotating inner flow inlet grille to be tested in the grille installation area, connect the water inlet of the backwashing facility of the grating plate rotating inner flow inlet grille to the backwashing water inlet pipe, connect the grating residue collection trough after backwashing of the grating plate rotating inner flow inlet grille to the grating residue conveying pipe, and electrically connect the grating plate rotating inner flow inlet grille to the control device;

[0033] Controlling to close the drain valve I, and injecting clean water into the test channel through the water injection port;

[0034] respectively controlling to open the outlet valve I, the outlet valve II, the control valve II and the control valve IV, and respectively controlling to close the control valve I and the control valve III;

[0035] Controlling and starting the variable frequency lifting pump, the variable frequency lifting pump lifts the clean water in the test channel through the outlet pipe, the upper water pipe, the surpassing pipe, and the inlet pipe, and then lifts the clean water into the water inlet area, continues to flow through the grid plate rotating inner inlet grille, and then flows into the water collection area;

[0036] According to the real-time flow data collected by the electromagnetic flowmeter, the maximum clean water flux of the grid plate rotating inner inlet grille is obtained.

[0037] The present invention also provides a grille performance testing method, using the grille performance testing system, the testing method comprises:

[0038] Install the grating plate rotating type internal inlet grille to be tested in the installation area, connect the water inlet of the backwashing facility of the grating plate rotating type internal inlet grille to the backwashing water inlet pipe, and connect the grating residue collection tank after backwashing of the grating plate rotating type internal inlet grille to the grating residue conveying pipe;

[0039] Controlling to close the drain valve I, and injecting clean water into the test channel through the water injection port;

[0040] respectively controlling to open the outlet valve I, the control valve I and the control valve II, and respectively controlling to close the control valve III, the control valve IV and the drain valve II;

[0041] Controlling and starting the variable frequency lifting pump, the clean water in the test channel is lifted by the variable frequency lifting pump through the outlet pipe and the upper water pipe into the screen residue premixing water tank, and starting the agitator;

[0042] Starting the screenings feeder to feed screenings into the screenings premix water tank, and adjusting the amount of screenings fed by adjusting the operating frequency of the variable frequency drive motor;

[0043] After the clean water and the screenings in the screenings premixing water tank are fully stirred and mixed by the agitator, they enter the water inlet area through the water inlet pipe, and continue to flow through the grid plate rotating inner inlet grid, the screenings are intercepted, and the clean water flows into the water collection area;

[0044] respectively obtaining real-time liquid level data of the water inlet area and the water catchment area;

[0045] In response to the liquid level difference between the water inlet area and the water catchment area being higher than the set maximum allowable liquid level difference, the variable frequency lifting pump and the screen residue feeder are controlled to stop running, and the variable frequency backwashing pump is controlled to start, and the variable frequency backwashing pump lifts the clean water in the water catchment area through the outlet pipe II and the backwashing water inlet pipe into the backwashing facility of the grid plate rotating type inner inlet grid to backwash the grid plate;

[0046] The screens after backwashing enter the screens feed hopper of the screens press through the screens conveying pipe, and are discharged into the screens collection bucket through the screens discharge port of the screens press after being screw pressed, and the squeezed water is discharged through the drain pipe III;

[0047] The water passing capacity of the grid plate rotating internal inlet grid under different grid residue dosages is calculated according to the real-time flow data collected by the electromagnetic flow meter.

[0048] The above technical solution of the present invention has the following advantages compared with the prior art:

[0049] (1) The present invention can simultaneously meet the test of multiple performance indicators such as water flux, maximum water flow capacity, flux attenuation, and screen residue interception efficiency of various types of (ultra) fine screens of both fixed screen type and rotating screen type.

[0050] (2) The present invention can flexibly adjust the type of screen residue and the amount of screen residue added in the test, so as to simulate different application scenarios such as urban / village sewage, initial rainwater, and combined sewer overflow pollution, and test the performance of (ultra) fine screens in different application scenarios.

[0051] (3) The grid performance test system of the present invention has a reasonable and compact structure, and the test is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0053] Figure 1 A schematic top view of a grille performance testing system according to the present invention.

[0054] Figure 2 A schematic structural diagram of a screen residue premixing water tank of a screen performance testing system of the present invention.

[0055] Figure 3 A schematic structural diagram of a screen slag feeder of a screen performance testing system of the present invention.

[0056] Figure 4 A schematic structural diagram of a screen residue press of a screen performance testing system of the present invention.

[0057] Description of the Figures in the Specification:

[0058] 1. Test channel; 2. Screen premixing water tank; 3. Screen dosing machine; 4. Screen press; 5. Variable frequency lifting pump; 6. Variable frequency backwash pump; 7. Control device; 8. Water inlet area; 9. Screen installation area; 10. Water confluence area; 11. Ultrasonic level meter I; 12. Ultrasonic level meter II; 13. Confluence port; 14. Water injection port; 15. Drain pipe I; 16. Drain valve I; 17. Agitator; 18. Drain pipe II; 19. Drain valve II; 20. Support frame; 21. Screen storage box; 22. Variable frequency drive motor; 23. Transmission roller; 24. Support roller; 25. Conveyor Belt; 26, discharge port; 27, machine body; 28, slag inlet hopper; 29, reduction motor; 30, screw shaft; 31, water collection trough; 32, slag outlet; 33, drain pipe III; 34, water outlet pipe I; 35, water outlet valve; 36, water supply pipe; 37, electromagnetic flowmeter; 38, control valve I; 39, water inlet pipe; 40, control valve II; 41, water inlet branch pipe; 42, control valve III; 43, water outlet pipe II; 44, water outlet valve II; 45, backwash water inlet pipe; 46, pressure gauge; 47, override pipe; 48, control valve IV; 49, screen slag conveying pipe; 50, screen slag collecting bucket. DETAILED DESCRIPTION

[0059] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0060] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0061] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0062] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0063] Example 1

[0064] Reference Figure 1 , Figure 2 As shown, a grid performance testing system of this embodiment includes:

[0065] A test channel 1, the test channel 1 comprising a water inlet area 8, a grille installation area 9 and a water collection area 10; wherein a water collection port 13 is provided at the top of the water collection area 10, a water injection port 14 is provided at the upper part of the side of the test channel 1, a drain pipe I 15 is provided at the bottom of the side, and a drain valve I 16 is provided on the drain pipe I 15;

[0066] A screens premixing water tank 2, wherein an agitator 17 is arranged inside the screens premixing water tank 2, the water inlet area 8 is connected with the screens premixing water tank 2, a drain pipe II 18 is arranged at the bottom of the screens premixing water tank 2, and a drain valve II 19 is arranged on the drain pipe II 18; wherein the water inlet area 8 is connected with the top of the side of the screens premixing water tank 2 through an inlet pipe 39, a control valve II 40 is arranged on the inlet pipe 39, and the inlet pipe 39 is also connected with an inlet branch pipe 41 and an overrunning pipe 47, respectively, a control valve III 42 is arranged on the inlet branch pipe 41, and a control valve IV 48 is arranged on the overrunning pipe 47;

[0067] A screenings feeder 3, connected to the screenings premix water tank 2, for feeding screenings into the screenings premix water tank 2;

[0068] A variable frequency lifting pump 5, the water inlet end of the variable frequency lifting pump 5 is connected to the bottom of the side of the water catchment area 10 through the water outlet pipe I 34, and the water outlet end of the variable frequency lifting pump 5 is connected to the bottom of the side of the screen residue premixing water tank 2 through the upper water pipe 36; wherein, a water outlet valve 35I is provided on the water outlet pipe I 34, and an electromagnetic flowmeter 37 and a control valve I 38 are provided on the upper water pipe 36; the upper water pipe 36 is connected to the water inlet pipe 39 through the transcending pipe 47;

[0069] A variable frequency backwash pump 6, the water inlet end of the variable frequency backwash pump 6 is connected to the side bottom of the water collection area 10 through a water outlet pipe II 43, a water outlet valve II 44 is provided on the water outlet pipe II 43, the water outlet end of the variable frequency backwash pump 6 is connected to a backwash water inlet pipe 45, and a pressure gauge 46 is provided on the backwash water inlet pipe 45;

[0070] Specifically, the variable frequency lifting pump 5 and the variable frequency backwashing pump 6 are installed below the screen residue premixing water tank 2. The tops of the water inlet area 8 and the screen installation area 9 are open structures respectively, and the top of the water collection area 10 is a sealed structure.

[0071] Specifically, the water inlet area 8 is provided with an ultrasonic liquid level meter I 11 , and the water collection area 10 is provided with an ultrasonic liquid level meter II 12 .

[0072] Reference Figure 3 As shown, the screenings feeder 3 includes a support frame 20 and a screenings storage box 21, a variable frequency drive motor 22, a transmission roller 23, a roller 24, a conveyor belt 25 and a discharge port 26 respectively arranged on the support frame 20; the conveyor belt 25 is connected to the transmission roller 23, the variable frequency drive motor 22 drives the transmission roller 23 to move, so as to drive the conveyor belt 25 to move, the roller 24 is used to support the movement of the conveyor belt 25, and the discharge port 26 is connected to the top of the screenings premix water tank 2.

[0073] Reference Figure 4 As shown, it also includes a screening slag press 4, which includes a body 27 and a slag inlet hopper 28, a reduction motor 29, a screw shaft 30, a water collection trough 31 and a slag outlet 32 ​​respectively arranged on the body 27, the slag inlet hopper 28 and the slag outlet 32 ​​are respectively located on one side of the two ends of the screw shaft 30, the reduction motor 29 is used to drive the screw shaft 30 to rotate, and the water collection trough 31 is located below the screw shaft 30.

[0074] Specifically, the water collection trough 31 is connected to an emptying pipe III 33 , the slag inlet hopper 28 is connected to a screen slag conveying pipe 49 leading to the screen installation area, and the slag outlet 32 ​​is connected to a screen slag collecting bucket 50 .

[0075] Specifically, it also includes a control device 7 (such as a PLC), which is respectively connected to the variable frequency lifting pump 5, the variable frequency backwashing water pump, the ultrasonic level meter I 11, the ultrasonic level meter II 12, the agitator 17, the variable frequency drive motor 22, the reduction motor 29, the electromagnetic flow meter 37, the control valve I 38, the control valve II 40, the control valve III 42, the pressure gauge 46, and the control valve IV 48.

[0076] Example 2

[0077] This embodiment provides a grille performance test method, which is applicable to the test of the clean water flux of a grille with a fixed grid plate. The grille performance test system described in Embodiment 1 is used, and the test method includes:

[0078] S1, installing the grid plate fixed type grille to be tested on the top of the water collection area 10, connecting the water inlet and the water outlet of the grid plate fixed type grille to the water inlet branch pipe 41 and the water collection port 13 respectively, and electrically connecting the grid plate fixed type grille to the control device 7;

[0079] S2, controlling the drain valve I 16 to close, and injecting clean water into the test channel 1 through the water injection port 14;

[0080] S3, power on the control device 7, respectively control to open the outlet valve 35Ⅰ, the control valve III 42 and the control valve IV 48, respectively control to close the control valve I 38 and the control valve II 40;

[0081] S4, control to start the variable frequency lifting pump 5, adjust the operating frequency of the variable frequency lifting pump 5 through the control device 7, and lift the clean water in the test channel 1 through the outlet pipe, the upper water pipe 36, the overtaking pipe 47, the inlet pipe 39 and the inlet branch pipe 41 through the variable frequency lifting pump 5, and enter the water inlet of the fixed grid type grille, and the clean water flows through the grid of the fixed grid type grille and flows into the water catchment area 10 through the water catchment port 13;

[0082] S5. The control device 7 obtains the maximum clean water flux of the grid plate fixed type grid according to the real-time flow data collected by the electromagnetic flow meter 37.

[0083] Example 3

[0084] This embodiment provides a grid performance test method for testing the water flow capacity of a grid plate fixed type grid under different amounts of grid residue. Using the grid performance test system described in Example 1, the test method includes:

[0085] S1, installing the grid plate fixed type grille to be tested on the top of the water collection area 10, connecting the water inlet and water outlet of the grid plate fixed type grille to the water inlet branch pipe 41 and the water collection port 13 respectively, and electrically connecting the grid plate fixed type grille to the control device 7;

[0086] S2, controlling the drain valve I 16 to close, and injecting clean water into the test channel 1 through the water injection port 14;

[0087] S3, the control device 7 is powered on to control the water outlet valve 35Ⅰ, the control valve Ⅰ38 and the control valve Ⅲ42 to be opened, and the control valve Ⅱ40, the control valve Ⅳ48 and the drain valve Ⅱ19 to be closed;

[0088] S4, control and start the variable frequency lifting pump 5, adjust the operating frequency of the variable frequency lifting pump 5 through the control device 7, lift the clean water in the test channel 1 through the outlet pipe and the upper water pipe 36 into the screens premixing water tank 2 through the variable frequency lifting pump 5, and start the agitator 17;

[0089] S5, start the screenings feeder 3, put the screenings into the screenings storage box 21, the transmission roller 23 rotates under the drive of the variable frequency drive motor 22, the screenings enter the screenings premixing water tank 2 through the conveyor belt 25 and the discharge port 26, and adjust the operating frequency of the variable frequency drive motor 22 through the control device 7, thereby adjusting the amount of screenings added;

[0090] S6, the clean water and the screenings in the screenings premixing water tank 2 are fully stirred and mixed by the agitator 17, and then enter the water inlet of the fixed-grid grille through the water inlet pipe 39 and the water inlet branch pipe 41, the screenings are intercepted by the grid of the fixed-grid grille, and the clean water flows into the catchment area 10 through the water confluence port 13, and the screenings on the grid are scraped by the scraper of the fixed-grid grille to the screenings press, and then discharged into the screenings collection bucket 50 after being squeezed by the screenings press;

[0091] S7, the control device 7 calculates the water passing capacity of the fixed grid type grid under different grid residue dosages according to the real-time flow data collected by the electromagnetic flow meter 37.

[0092] Example 4

[0093] This embodiment provides a grille performance test method for testing the clean water flux of a grille with rotating grid plates and an inner inlet grille. The test method uses the grille performance test system described in Embodiment 1 and includes:

[0094] S1, install the grating plate rotating type inner inlet grille to be tested in the grille installation area 9, connect the water inlet of the backwashing facility of the grating plate rotating type inner inlet grille to the backwashing water inlet pipe 45, connect the screen residue collection tank after backwashing of the grating plate rotating type inner inlet grille to the screen residue conveying pipe 49, and electrically connect the grating plate rotating type inner inlet grille to the control device 7;

[0095] S2, controlling the drain valve I 16 to close, and injecting clean water into the test channel 1 through the water injection port 14;

[0096] S3, power on the control device 7, respectively control to open the outlet valve 35I, the outlet valve II 44, the control valve II 40 and the control valve IV 48, respectively control to close the control valve I 38 and the control valve III 42;

[0097] S4, control to start the variable frequency lifting pump 5, adjust the operating frequency of the variable frequency lifting pump 5 through the control device 7, and lift the clean water in the test channel 1 through the variable frequency lifting pump 5 through the outlet pipe, the upper water pipe 36, the transcending pipe 47, and the inlet pipe 39, and then enter the water inlet area 8, continue to flow through the grid plate rotating type inner inlet grille, and then merge into the water collection area 10;

[0098] S5. The control device 7 obtains the maximum clean water flux of the grid plate rotating inner inlet grille according to the real-time flow data collected by the electromagnetic flow meter 37.

[0099] Example 5

[0100] This embodiment provides a grid performance test method for testing the water flow capacity of the grid plate to the inlet grid under different amounts of grid residue. The grid performance test system described in Example 1 is used, and the test method includes:

[0101] S1, installing the grating plate rotating type inner inlet grille to be tested in the installation area, connecting the water inlet of the backwashing facility of the grating plate rotating type inner inlet grille to the backwashing water inlet pipe 45, connecting the screen residue collection tank after backwashing of the grating plate rotating type inner inlet grille to the screen residue conveying pipe 49, and electrically connecting the grating plate rotating type inner inlet grille to the control device 7;

[0102] S2, controlling the drain valve I 16 to close, and injecting clean water into the test channel 1 through the water injection port 14;

[0103] S3, the control device 7 is powered on to control the water outlet valve 35Ⅰ, the control valve Ⅰ38 and the control valve Ⅱ40 to be opened, and the control valve Ⅲ42, the control valve Ⅳ48 and the drain valve Ⅱ19 to be closed;

[0104] S4, control and start the variable frequency lifting pump 5, adjust the operating frequency of the variable frequency lifting pump 5 through the control device 7, lift the clean water in the test channel 1 through the outlet pipe and the upper water pipe 36 into the screenings premixing water tank 2 through the variable frequency lifting pump 5, and start the agitator 17;

[0105] S5, start the screenings feeder 3, put the screenings into the screenings storage box 21, the transmission roller 23 rotates under the drive of the variable frequency drive motor 22, the screenings enter the screenings premixing water tank 2 through the conveyor belt 25 and the discharge port 26, and adjust the operating frequency of the variable frequency drive motor 22 through the control device 7, thereby adjusting the amount of screenings added;

[0106] S6, the clean water and the screenings in the screenings premixing water tank 2 are fully stirred and mixed by the agitator 17, and then enter the water inlet area 8 through the water inlet pipe 39, and continue to flow through the grid plate rotating inner inlet grid, the screenings are intercepted, and the clean water flows into the water collection area 10;

[0107] S7, obtaining the real-time liquid level data of the water inlet area 8 through the ultrasonic liquid level meter I 11, and obtaining the real-time liquid level data of the water catchment area 10 through the ultrasonic liquid level meter II 12;

[0108] S8, when the liquid level difference between the water inlet area 8 and the water collection area 10 is higher than the set maximum allowable liquid level difference, the variable frequency lifting pump 5 and the screen residue dosing machine 3 are controlled to stop running, and the variable frequency backwashing pump 6 is controlled to start, and the variable frequency backwashing pump 6 lifts the clean water in the water collection area 10 through the outlet pipe II 43 and the backwashing water inlet pipe 45 into the backwashing facility of the grid plate rotating inner inlet grid to backwash the grid plate, and the screen residue after backwashing enters the residue inlet hopper 28 of the screen residue press 4 through the screen residue conveying pipe 49, and is discharged into the screen residue collection bucket 50 from the residue outlet 32 ​​of the screen residue press 4 after spiral pressing, and the squeezed water is discharged through the drain pipe III 33 at the bottom of the water collection tank 31;

[0109] S9, the control device 7 calculates the water passing capacity of the rotating grid type inner inlet grid under different grid residue dosages according to the real-time flow data collected by the electromagnetic flow meter 37.

[0110] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A grid performance testing system, characterized in that: include: A test channel (1), the test channel (1) comprising a water inlet area (8), a grille installation area (9) and a water collection area (10); wherein the water collection area (10) is provided with a water collection port (13), a water injection port (14) and a drain pipe I (15); and a drain valve I (16) is provided on the drain pipe I (15); A screens premixing water tank (2), wherein an agitator (17) is arranged inside the screens premixing water tank (2), the water inlet area (8) is connected to the screens premixing water tank (2), the screens premixing water tank (2) is provided with an emptying pipe II (18), and the emptying pipe II (18) is provided with an emptying valve II (19); wherein the water inlet area (8) is connected to the screens premixing water tank (2) via an inlet pipe (39), a control valve II (40) is arranged on the inlet pipe (39), the inlet pipe (39) is further connected to an inlet branch pipe (41) and an overrunning pipe (47), the inlet branch pipe (41) is provided with a control valve III (42), and the overrunning pipe (47) is provided with a control valve IV (48); A screenings feeder (3), connected to the screenings premix water tank (2), and used for feeding screenings into the screenings premix water tank (2); A variable frequency lifting pump (5), wherein the water inlet end of the variable frequency lifting pump (5) is connected to the water catchment area (10) via a water outlet pipe I (34), and the water outlet end of the variable frequency lifting pump (5) is connected to the screen residue premixing water tank (2) via an upper water pipe (36); wherein a water outlet valve (35) I is provided on the water outlet pipe I (34), and an electromagnetic flowmeter (37) and a control valve I (38) are provided on the upper water pipe (36); and the upper water pipe (36) is connected to the water inlet pipe (39) via the transcending pipe (47); A variable frequency backwash pump (6), wherein the water inlet end of the variable frequency backwash pump (6) is connected to the water collection area (10) via a water outlet pipe II (43), a water outlet valve II (44) is provided on the water outlet pipe II (43), and the water outlet end of the variable frequency backwash pump (6) is connected to the backwash water inlet pipe (45).

2. A grid performance testing system according to claim 1, characterized in that: The tops of the water inlet area (8) and the grille installation area (9) are respectively open structures, and the top of the water collection area (10) is a sealed structure.

3. A grid performance testing system according to claim 1, characterized in that: The water inlet area (8) is provided with an ultrasonic liquid level meter I (11), and the water collection area (10) is provided with an ultrasonic liquid level meter II (12).

4. A grid performance testing system according to claim 1, characterized in that: The screen slag doser (3) comprises a support frame (20), a screen slag storage box (21), a variable frequency drive motor (22), a transmission roller (23), a support roller (24), a conveyor belt (25) and a discharge port (26) which are respectively arranged on the support frame (20); the conveyor belt (25) is connected to the transmission roller (23), the variable frequency drive motor (22) drives the transmission roller (23) to move, so as to drive the conveyor belt (25) to move, the support roller (24) is used to support the movement of the conveyor belt (25), and the discharge port (26) is connected to the screen slag premix water tank (2).

5. A grid performance testing system according to claim 1, characterized in that: The invention also comprises a screenings press (4), the screenings press (4) comprising a machine body (27), and a screenings hopper (28), a reduction motor (29), a screw shaft (30), a water collection trough (31) and a screenings outlet (32) respectively arranged on the machine body (27), the screenings hopper (28) and the screenings outlet (32) being respectively located on one side of both ends of the screw shaft (30), the reduction motor (29) being used to drive the screw shaft (30) to rotate, and the water collection trough (31) being located below the screw shaft (30).

6. A grid performance testing system according to claim 5, characterized in that: The water collection trough (31) is connected to an emptying pipe III (33), the slag inlet hopper (28) is connected to a screen slag conveying pipe (49) leading to the screen installation area, and the slag outlet (32) is connected to a screen slag collecting bucket (50).

7. A grid performance testing method, characterized in that: Using the grid performance testing system according to any one of claims 1 to 6, the testing method comprises: The grid plate fixed type grille to be tested is installed on the top of the water collection area (10), and the water inlet and the water outlet of the grid plate fixed type grille are connected to the water inlet branch pipe (41) and the water collection port (13) respectively; Controlling the drain valve I (16) to close, and injecting clean water into the test channel (1) through the water injection port (14); respectively controlling the opening of the water outlet valve (35) I, the control valve III (42) and the control valve IV (48), and respectively controlling the closing of the control valve I (38) and the control valve II (40); Controlling and starting the variable frequency lifting pump (5), the variable frequency lifting pump (5) lifts the clean water in the test channel (1) through the water outlet pipe, the water supply pipe (36), the bypass pipe (47), the water inlet pipe (39) and the water inlet branch pipe (41), and then enters the water inlet of the fixed grid type grille, and the clean water flows through the grid of the fixed grid type grille and then flows into the water collection area (10) through the water collection port (13); The maximum clean water flux of the grid plate fixed type grid is obtained based on the real-time flow data collected by the electromagnetic flow meter (37).

8. A grid performance testing method, characterized in that: Utilizing the grid performance testing system of claim 6, the testing method comprises: The grid plate fixed type grille to be tested is installed on the top of the water collection area (10), and the water inlet and the water outlet of the grid plate fixed type grille are respectively connected to the water inlet branch pipe (41) and the water collection port (13); Controlling the drain valve I (16) to close, and injecting clean water into the test channel (1) through the water injection port (14); respectively controlling the opening of the outlet valve (35) I, the control valve I (38) and the control valve III (42), and respectively controlling the closing of the control valve II (40), the control valve IV (48) and the drain valve II (19); Controlling and starting the variable frequency lifting pump (5), using the variable frequency lifting pump (5) to lift the clean water in the test channel (1) through the water outlet pipe and the water supply pipe (36) into the screenings premixing water tank (2), and starting the agitator (17); Starting the screenings feeder (3) to feed screenings into the screenings premix water tank (2); After the clean water and the screenings in the screenings premixing water tank (2) are fully stirred and mixed by the stirrer (17), they enter the water inlet of the fixed-grid type grid after passing through the water inlet pipe (39) and the water inlet branch pipe (41), the screenings are intercepted by the grid of the fixed-grid type grid, and the clean water flows into the water collection area (10) through the water confluence port (13), and the screenings on the grid are scraped by the scraper provided by the fixed-grid type grid to the screenings press provided by the fixed-grid type grid, and then discharged into the screenings collection bucket (50) after being squeezed by the screenings press provided by the fixed-grid type grid; The water flow capacity of the fixed grid type grid under different grid residue dosages is calculated based on the real-time flow data collected by the electromagnetic flow meter (37).

9. A grid performance testing method, characterized in that: Utilizing the grid performance testing system of claim 6, the testing method comprises: The grating plate rotating type inner flow inlet grille to be tested is installed in the grille installation area (9), the water inlet of the backwashing facility of the grating plate rotating type inner flow inlet grille is connected to the backwashing water inlet pipe (45), and the grating residue collection tank after backwashing of the grating plate rotating type inner flow inlet grille is connected to the grating residue conveying pipe (49); Controlling the drain valve I (16) to close, and injecting clean water into the test channel (1) through the water injection port (14); respectively controlling the opening of the water outlet valve (35) I, the water outlet valve II (44), the control valve II (40) and the control valve IV (48), and respectively controlling the closing of the control valve I (38) and the control valve III (42); Controlling and starting the variable frequency lifting pump (5), so that the clean water in the test channel (1) is lifted by the variable frequency lifting pump (5) through the water outlet pipe, the water supply pipe (36), the overrunning pipe (47), and the water inlet pipe (39), enters the water inlet area (8), continues to flow through the grid plate rotating type inner inlet grille, and then flows into the water collection area (10); The maximum clean water flux of the grid plate rotating inner inlet grille is obtained based on the real-time flow data collected by the electromagnetic flow meter (37).

10. A grid performance testing method, characterized in that: Utilizing the grid performance testing system of claim 6, the testing method comprises: The grating plate rotating type inner flow inlet grille to be tested is installed in the installation area, the water inlet of the backwashing facility of the grating plate rotating type inner flow inlet grille is connected to the backwashing water inlet pipe (45), and the grating residue collection tank after backwashing of the grating plate rotating type inner flow inlet grille is connected to the grating residue conveying pipe (49); Controlling the drain valve I (16) to close, and injecting clean water into the test channel (1) through the water injection port (14); respectively controlling the opening of the outlet valve (35) I, the control valve I (38) and the control valve II (40), and respectively controlling the closing of the control valve III (42), the control valve IV (48) and the drain valve II (19); Controlling and starting the variable frequency lifting pump (5), lifting the clean water in the test channel (1) through the variable frequency lifting pump (5) through the water outlet pipe and the water supply pipe (36) into the screenings premixing water tank (2), and starting the agitator (17); Starting the screenings feeder (3) to feed screenings into the screenings premix water tank (2); After the clean water and the screenings in the screenings premixing water tank (2) are fully stirred and mixed by the stirrer (17), they enter the water inlet area (8) through the water inlet pipe (39), and continue to flow through the grid plate rotating inner inlet grille, whereupon the screenings are intercepted and the clean water flows into the water collection area (10); respectively obtaining real-time liquid level data of the water inlet area (8) and the water catchment area (10); In response to the liquid level difference between the water inlet area (8) and the water collection area (10) being higher than a set maximum allowable liquid level difference, the variable frequency lifting pump (5) and the screen residue feeder (3) are controlled to stop running, and the variable frequency backwashing pump (6) is controlled to start, so that the variable frequency backwashing pump (6) lifts the clean water in the water collection area (10) through the outlet pipe II (43) and the backwashing water inlet pipe (45) into the backwashing facility of the grid plate rotating type inner inlet grid to backwash the grid plate; The screens after backwashing enter the screens feed hopper (28) of the screens press (4) through the screens conveying pipe (49), and after being screw pressed, are discharged from the screens discharge port (32) of the screens press (4) into the screens collection bucket (50), and the squeezed water is discharged through the drain pipe III (33); The water flow capacity of the grid plate rotating internal inlet grid under different grid residue dosages is calculated based on the real-time flow data collected by the electromagnetic flow meter (37).

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