A vertical filter press four times countercurrent washing device and method

Abstract

The application discloses a vertical filter press four-time countercurrent washing device and method, relates to the technical field of filter press, and comprises a vertical filter press, a hydraulic pump, a hydraulic station, a air-drying valve, a washing valve, a first pressure transmitter, a feeding valve, a back feeding valve, a feeding pump, a slurry tank, a second pressure transmitter, a cleaning valve, a extrusion valve, a pressure relief valve, a cleaning extrusion water pump, a cleaning extrusion water tank, a first liquid level transmitter, a first water supplement valve, an exhaust valve, a gas-liquid separation tank, a mother liquor valve, a mother liquor tank, a first washing backwater valve and a washing liquid collecting tank. When the filter cake is washed, the extrusion process can be inserted between the washing processes, and each process can be realized by setting corresponding parameters in the touch screen interface, so that the use is more flexible and convenient. The four-time countercurrent washing function can effectively control the water consumption, save resources and reduce the cost.

Description

Technical Field

[0001] This invention relates to the field of filter press technology, specifically to a vertical filter press with a four-stage countercurrent washing device and method. Background Technology

[0002] Vertical filter presses, as highly automated and technologically advanced solid-liquid separation equipment in modern society, integrate functions such as filtration, washing, extrusion, and drying, and are widely used in industries such as mining, metallurgy, chemical, pharmaceutical, lithium battery, and environmental engineering. With the improvement of modern industrial levels, vertical filter presses are developing towards larger scale, higher intelligence, and more multifunctionality.

[0003] Cake washing is one of the main functions of a vertical filter press. Cake washing involves removing a component remaining in the solids after the slurry is filtered through the filter cloth. This component is dissolved in the washing liquid and then discharged along with the washing liquid after filtration through the filter cloth, ensuring its concentration is below the required process level. Most current vertical filter presses use forward flow washing, where the filter cake is continuously rinsed with washing liquid to achieve the washing process requirements. The disadvantages of this method are: high water consumption, resource waste, large amounts of waste liquid that are difficult to treat, and high cost.

[0004] Based on this, a vertical filter press four-stage countercurrent washing device and method are provided, which can eliminate the drawbacks of existing devices. Summary of the Invention

[0005] The purpose of this invention is to provide a four-stage countercurrent washing device and method for a vertical filter press, so as to solve the problems of large water consumption, waste of resources, large amount of washing waste liquid, difficult treatment, and high cost in the existing filter cake washing process.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A four-stage countercurrent washing device for a vertical filter press includes a vertical filter press, a hydraulic pump, a hydraulic station, a drying valve, a washing valve, a first pressure transmitter, a feed valve, a return valve, a feed pump, a slurry tank, a second pressure transmitter, a cleaning valve, a squeezing valve, a pressure relief valve, a cleaning squeezing water pump, a cleaning squeezing water tank, a first level transmitter, a first water supply valve, an exhaust valve, a gas-liquid separator, a mother liquor valve, a mother liquor tank, a first wash return water valve, a washing liquid collection tank, a second wash return water valve, a first wash water tank, a first wash inlet valve, a third wash return water valve, a second wash water tank, and a second wash inlet valve. The system comprises a fourth-wash return water valve, a third-wash water tank, a third-wash inlet water valve, a second makeup water valve, a second level transmitter, a fourth-wash water tank, a fourth-wash inlet water valve, a washing water pump, a flow transmitter, and an electrical control system. The hydraulic pump, hydraulic station, and vertical filter press are connected via hydraulic pipelines. The fourth-wash water tank is equipped with a second makeup water valve, a second level transmitter, and a fourth-wash inlet water valve. The third-wash water tank is equipped with a fourth-wash return water valve and a third-wash inlet water valve. The second-wash water tank is equipped with a third-wash return water valve and a second-wash inlet water valve. The first-wash water tank is equipped with a second-wash return water valve and a first-wash inlet water valve. The washing liquid... The collection tank is equipped with a wash return water valve, the mother liquor tank is equipped with a mother liquor valve, the gas-liquid separator is equipped with an exhaust valve, the cleaning and squeezing water tank is equipped with a first level transmitter and a first water supply valve, the slurry tank is equipped with a feed valve, a return valve, and a feed pump, the feed valve is connected to a drying valve and a washing valve via pipelines, the return valve is connected to a first pressure transmitter via pipelines, the drying valve and the washing valve are connected to the first pressure transmitter via pipelines, the first pressure transmitter is connected to a vertical filter press via pipelines, and the fourth wash inlet valve and the third wash inlet valve are also included. The inlet valve, the second wash inlet valve, and the first wash inlet valve are connected to the washing water pump via pipelines. The washing water pump and the washing valves are connected to a flow transmitter via pipelines. The fourth wash return valve, the third wash return valve, the second wash return valve, the first wash return valve, the mother liquor valve, and the vent valve are connected to the vertical filter press via pipelines. The cleaning and squeezing water tank and the vertical filter press are connected via pipelines and a pressure relief valve. The cleaning and squeezing water tank is equipped with a cleaning and squeezing water pump. The cleaning and squeezing water pump and the vertical filter press are connected via pipelines and a second pressure transmitter, a cleaning valve, and a squeezing valve.

[0008] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0009] In one alternative: the slurry tank and the cleaning and squeezing water tank are both located below the horizontal plane of the vertical filter press.

[0010] In one alternative: the hydraulic station is equipped with an electromagnetic directional valve.

[0011] In one alternative: the electrical control system includes a PLC and a touch screen, and the electrical control system is connected to the vertical filter press and its auxiliary equipment via cables.

[0012] In one alternative embodiment: the vertical filter press includes a base plate, a top plate, a feed box, a first fixed plate, a second fixed plate, a filtrate collection box, and a water tank. The second fixed plate and the first fixed plate are fixedly connected to the side wall of the base plate. The filtrate collection box is fixedly connected to the upper surface of the second fixed plate. The feed box, a pressure booster, and the water tank are fixedly connected to the upper surface of the first fixed plate. The top plate is fixedly connected to the upper surface of the feed box, the pressure booster, the filtrate collection box, and the water tank. Two hydraulic cylinders are fixedly connected through the upper surface of the top plate. A cover plate is fixedly connected to the output ends of the two hydraulic cylinders. Several filter plates are arranged between the cover plate and the base plate. The filter press has a U-shaped cross-section. Each filter press has a feed hole, a pressurizing hole, and a liquid outlet on its sidewalls. The feed box is connected to the feed hole of the filter press via a flexible hose. The pressurizer is connected to the pressurizing hole of the filter press via a flexible air pipe. The filtrate collection box is connected to the liquid outlet of the filter press via a flexible hose. A clamping plate is fixedly connected to the upper surface of the filter press. A clamping plate groove corresponding to the clamping plate is formed on the lower surface of the filter press. The clamping plate of the lower filter press is slidably connected to the inner sidewall of the clamping plate groove of the upper filter press. One-way valves are installed in the feed box, pressurizer, filtrate collection box, and water supply tank.

[0013] In one alternative: two telescopic grooves are formed on the upper surface of the filter press plate, and telescopic cylinders are fixedly connected to the inner sidewalls of the two telescopic grooves. Telescopic rods are slidably connected to the inner sidewalls of the two telescopic cylinders. Damping springs are fixedly connected between the telescopic rods and the inner sidewalls of the telescopic cylinders. The bottom plate is fixedly connected to the bottommost filter press plate, and the top filter press plate is connected to the cover plate through a telescopic rod. The top telescopic rod is fixedly connected to the lower surface of the cover plate.

[0014] In one alternative embodiment: the inner wall of the filter press plate is rotatably connected to two first rotating shafts via bearings. The two first rotating shafts are driven by a chain and sprocket. Each of the two first rotating shafts is fixedly connected to a transmission roller. The two transmission rollers cooperate with a filter cloth. A filtrate plate is fixedly connected to the inner wall of the filter press plate. The side wall of the filtrate plate has several filtrate holes. A third fixing plate and a baffle are fixedly connected to the side wall of the filter press plate. A motor is fixedly connected to the outer wall of the filter press plate via a bracket. One of the first rotating shafts extends through the filter press plate and is fixedly connected to the output end of the motor. The baffle abuts against the filter cloth.

[0015] In one alternative: the side wall of the filter press plate is provided with a plurality of water spray holes, each of the plurality of water spray holes is provided with a water spray head, a water spray box is fixedly connected to the outer side wall of the filter press plate, the portions of the plurality of water spray heads located outside the filter press plate are all located inside the water spray box, and the plurality of water spray boxes are all connected to a water supply box through telescopic water pipes.

[0016] In one alternative embodiment: a movable block groove is formed inside the filter press plate; an electric push rod is fixedly connected to the inner side wall of the movable block groove; two fixed rods are fixedly connected to the inner side wall of the movable block groove; a movable block is slidably connected to the inner side wall of the movable block groove; a scraper is slidably connected to the inner side wall of the filter press plate; the lower surface of the scraper abuts against the filter cloth; two damping spring grooves are formed on the side wall of the movable block; a damping spring is fixedly connected to the inner side wall of the scraper and the damping spring groove; a second rotating shaft groove is formed on the side wall of the movable block; two second rotating shafts are rotatably connected to the bottom wall of the second rotating shaft groove via bearings; a coil spring is provided between the second rotating shaft and the bottom wall of the second rotating shaft groove; a cam is fixedly connected to the second rotating shaft; the cam abuts against the side wall of the scraper; a pull rope is wound around the second rotating shaft; the end of the pull rope away from the second rotating shaft extends through the movable block groove and is fixedly connected to the fixed rod.

[0017] This invention also discloses a method for using a four-stage countercurrent washing device for a vertical filter press, comprising the following steps:

[0018] Step 1: First, locate and set the relevant parameters on the touch screen of the electronic control system. After setting the relevant parameters, press the start button to start the control system. First, start the hydraulic pump, switch the solenoid reversing valve of the hydraulic station, loosen the filter cloth of the vertical filter press into place, and then lower the plate to the plate-sealed state to prepare for feeding.

[0019] Step 2: Feeding process. Open the feed valve and mother liquor valve, start the feed pump, and the slurry is pumped from the slurry tank into the plates of the vertical filter press. The filtrate filtered through the filter cloth flows into the mother liquor tank. When the feeding time reaches the set value, or the value of the first pressure transmitter exceeds the set value of the feeding pressure, the feeding process ends, the feed pump is stopped, and the feed valve and mother liquor valve are closed.

[0020] Step 3: Material return process. After the feeding process is completed, open the material return valve to return the slurry remaining in the pipeline to the slurry tank by its own weight. When the set material return time is reached, end the material return process and close the material return valve.

[0021] Step 4: One-time extrusion process. Open the extrusion valve and mother liquor valve, start the cleaning extrusion water pump, and pump the extrusion water from the cleaning extrusion water tank into the plate diaphragm of the vertical filter press to extrude the filter cake; the filtrate filtered through the filter cloth flows into the mother liquor tank; when the time reaches the set value for one extrusion time, or the value of the second pressure transmitter exceeds the set value for one extrusion pressure, end one extrusion process, stop the cleaning extrusion water pump, and close the extrusion valve and mother liquor valve;

[0022] Step 5: One pressure relief process. Open the pressure relief valve and return the squeezed water in the diaphragm of the vertical filter press to the cleaning squeezed water tank; when the time reaches the set value for one pressure relief time, end one pressure relief process and close the pressure relief valve.

[0023] Step Six: For one washing cycle, open the washing valve, the first washing inlet valve, and the first washing return valve, and start the washing water pump. The washing liquid is pumped from the first washing water tank into the plates of the vertical filter press. The filtrate filtered through the filter cloth flows into the washing liquid collection tank. When the time reaches the set value for one washing cycle, or the value of the flow transmitter exceeds the set value for one washing flow, end the one washing cycle, stop the washing water pump, and close the washing valve, the first washing inlet valve, and the first washing return valve.

[0024] Step 7: Secondary squeezing process. Open the squeezing valve and the first wash return water valve, start the cleaning squeezing water pump, and pump the squeezing water from the cleaning squeezing water tank into the plate diaphragm of the vertical filter press to squeeze the filter cake; the filtrate filtered through the filter cloth flows into the washing liquid collection tank; when the time reaches the secondary squeezing time setting value, or the value of the second pressure transmitter exceeds the secondary squeezing pressure setting value, end the secondary squeezing process, stop the cleaning squeezing water pump, and close the squeezing valve and the first wash return water valve.

[0025] Step 8: Secondary pressure relief process. Open the pressure relief valve to return the squeezed water in the diaphragm of the vertical filter press to the cleaning squeezed water tank. When the time reaches the secondary pressure relief time set value, end the secondary pressure relief process and close the pressure relief valve.

[0026] Step 9: Secondary washing process. Open the washing valve, secondary washing inlet valve, and secondary washing return valve. Start the washing water pump. The washing liquid is pumped from the secondary washing water tank into the plates of the vertical filter press. The filtrate filtered through the filter cloth flows into the primary washing water tank. When the time reaches the secondary washing time setting value, or the value of the flow transmitter exceeds the secondary washing flow setting value, end the secondary washing process, stop the washing water pump, and close the washing valve, secondary washing inlet valve, and secondary washing return valve.

[0027] Step 10: Three-stage squeezing process. Open the squeezing valve and the second wash return water valve, start the cleaning squeezing water pump, and pump the squeezing water from the cleaning squeezing water tank into the plate diaphragm of the vertical filter press to squeeze the filter cake; the filtrate filtered through the filter cloth flows into the first wash water tank; when the time reaches the three-stage squeezing time setting value, or the value of the second pressure transmitter exceeds the three-stage squeezing pressure setting value, end the three-stage squeezing process, stop the cleaning squeezing water pump, and close the squeezing valve and the second wash return water valve.

[0028] Step 11: Three-stage pressure relief process. Open the pressure relief valve to return the squeezed water in the diaphragm of the vertical filter press to the cleaning squeezed water tank; when the time reaches the set value for the three-stage pressure relief process, end the three-stage pressure relief process and close the pressure relief valve.

[0029] Step 12: Three-wash process. Open the washing valve, the third-wash inlet valve, and the third-wash return valve. Start the washing water pump. The washing liquid is pumped from the third-wash water tank into the plates of the vertical filter press. The filtrate filtered through the filter cloth flows into the second-wash water tank. When the time reaches the set value for the third-wash time, or the value of the flow transmitter exceeds the set value for the third-wash flow rate, end the three-wash process, stop the washing water pump, and close the washing valve, the third-wash inlet valve, and the third-wash return valve.

[0030] Step 13: Four-stage squeezing process. Open the squeezing valve and the third wash return water valve, start the cleaning squeezing water pump, and pump the squeezing water from the cleaning squeezing water tank into the plate diaphragm of the vertical filter press to squeeze the filter cake; the filtrate filtered through the filter cloth flows into the second wash water tank; when the time reaches the four-stage squeezing time setting value, or the value of the second pressure transmitter exceeds the four-stage squeezing pressure setting value, end the four-stage squeezing process, stop the cleaning squeezing water pump, and close the squeezing valve and the third wash return water valve;

[0031] Step Fourteen: Four-stage pressure relief process. Open the pressure relief valve to return the squeezed water in the diaphragm of the vertical filter press to the cleaning squeezed water tank; when the time reaches the four-stage pressure relief time set value, end the four-stage pressure relief process and close the pressure relief valve.

[0032] Step 15: Four-wash process. Open the washing valve, the fourth-wash inlet valve, and the fourth-wash return valve. Start the washing water pump. The washing liquid is pumped from the fourth-wash water tank into the plates of the vertical filter press. The filtrate filtered through the filter cloth flows into the third-wash water tank. When the time reaches the set value for the fourth washing time, or the value of the flow transmitter exceeds the set value for the fourth washing flow, end the four-wash process, stop the washing water pump, and close the washing valve, the fourth-wash inlet valve, and the fourth-wash return valve.

[0033] Step 16: Five-cycle squeezing process. Open the squeezing valve and the fourth wash return water valve, start the cleaning squeezing water pump, and pump the squeezing water from the cleaning squeezing water tank into the plate diaphragm of the vertical filter press to squeeze the filter cake; the filtrate filtered through the filter cloth flows into the third wash water tank; when the time reaches the five-cycle squeezing time setting value, or the value of the second pressure transmitter exceeds the five-cycle squeezing pressure setting value, end the five-cycle squeezing process, stop the cleaning squeezing water pump, and close the squeezing valve and the fourth wash return water valve;

[0034] Step 17: Five-stage pressure relief process. Open the pressure relief valve to return the squeezed water in the diaphragm of the vertical filter press to the cleaning squeezed water tank; when the time reaches the set value for five-stage pressure relief, end the five-stage pressure relief process and close the pressure relief valve.

[0035] Step 18: One drying process. Open the exhaust valve and the drying valve. Compressed air for drying enters the plates of the vertical filter press. The air-water filtrate filtered through the filter cloth flows into the gas-liquid separator. When the time reaches the set value for one drying time, end one drying process and close the drying valve and the exhaust valve.

[0036] Step 19: First exhaust process. Open the exhaust valve to discharge the residual dried air in the plates and filtrate pipes of the vertical filter press into the gas-liquid separator. When the time reaches the set value for the first exhaust process, end the first exhaust process and close the exhaust valve.

[0037] Step 20: Then switch the solenoid directional valve of the hydraulic station to raise the plates of the vertical filter press to the open state. After the filter cloth is tensioned, it enters the unloading process.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] 1. In the filter cake washing process, the present invention allows for the interleaving of extrusion processes between each washing process. Each process can be implemented by setting the corresponding parameters in the touch screen interface, making it more flexible and convenient to use.

[0040] 2. This invention can effectively control water consumption through a four-stage counter-current washing function, resulting in less water consumption, resource conservation, and cost reduction. Attached Figure Description

[0041] Figure 1 This is a diagram of the four-stage countercurrent washing process of the vertical filter press of the present invention.

[0042] Figure 2 This is a first-view view of the vertical filter press of the present invention.

[0043] Figure 3 This is a second perspective view of the vertical filter press of the present invention.

[0044] Figure 4 This is a third-view view of the vertical filter press of the present invention.

[0045] Figure 5 This is a partial cross-sectional view of the vertical filter press of the present invention.

[0046] Figure 6 This is a first-view view of the filter press plate of the present invention.

[0047] Figure 7 This is a second perspective view of the filter press plate of the present invention.

[0048] Figure 8 This is a third-view view of the filter press plate of the present invention.

[0049] Figure 9 This is a first-view view of the internal structure of the filter press plate of the present invention.

[0050] Figure 10 This is a second perspective view of the internal structure of the filter press plate of the present invention.

[0051] Figure 11 This is a third-view view of the internal structure of the filter press plate of the present invention.

[0052] Figure 12 This is a schematic diagram of the internal structure of the telescopic cylinder of the present invention.

[0053] Figure 13 This is a schematic diagram of the internal structure of the movable block of the present invention.

[0054] Figure 14 This is a schematic diagram of the filter plate structure of the present invention.

[0055] Figure Labels: 1 Vertical Filter Press, 2 Hydraulic Pump, 3 Hydraulic Station, 4 Drying Valve, 5 Washing Valve, 6 First Pressure Transmitter, 7 Feed Valve, 8 Return Valve, 9 Feed Pump, 10 Slurry Tank, 11 Second Pressure Transmitter, 12 Cleaning Valve, 13 Squeezing Valve, 14 Pressure Relief Valve, 15 Cleaning Squeezing Water Pump, 16 Cleaning Squeezing Water Tank, 17 First Liquid Level Transmitter, 18 First Water Supply Valve, 19 Exhaust Valve, 20 Gas-Liquid Separator, 21 Mother Liquor Valve, 22 Mother Liquor Tank, 23 First Wash Return Water Valve, 24 Washing Liquid Collection Tank, 25 Second Wash Return Water Valve, 26 First Wash Water Tank, 27 First Wash Inlet Valve, 28 Third Wash Return Water Valve, 29 Second Wash Water Tank, 30 Second Wash Inlet Valve, 31 Fourth Wash Return Water Valve, 32 Third Wash Water Tank, 33 Third Wash Inlet Valve, 34 Second Water Supply Valve 35 Water valve, 36 Second level transmitter, 37 Fourth wash water tank, 38 Fourth wash inlet valve, 39 Washing water pump, 40 Flow transmitter, 41 Electrical control system, 42 Base plate, 43 Hydraulic cylinder, 44 Top plate, 45 Feed box, 46 Pressure booster, 47 First fixed plate, 48 Filtrate collection box, 49 Cover plate, 50 Motor, 51 Filter press plate, 52 Clamping plate, 53 Scraper, 54 Third fixed plate, 55 Filtrate plate, 56 Drive roller, 57 First rotating shaft, 58 Electric push rod, 59 Baffle, 60 Filter cloth, 61 Moving block, 62 Pull rope, 63 Fixed rod, 64 Telescopic rod, 65 Telescopic cylinder, 66 Spray tank, 67 Spray head, 68 Second rotating shaft, 69 Second rotating shaft groove, 70 Damping spring groove, 71 Water supply tank. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0057] In one embodiment, such as Figures 1-14As shown, a vertical filter press four-stage countercurrent washing device includes a vertical filter press 1, a hydraulic pump 2, a hydraulic station 3, a drying valve 4, a washing valve 5, a first pressure transmitter 6, a feed valve 7, a return valve 8, a feed pump 9, a slurry tank 10, a second pressure transmitter 11, a cleaning valve 12, a squeezing valve 13, a pressure relief valve 14, a cleaning squeezing water pump 15, a cleaning squeezing water tank 16, a first level transmitter 17, a first water supply valve 18, an exhaust valve 19, a gas-liquid separator 20, a mother liquor valve 21, a mother liquor tank 22, a first wash return water valve 23, a washing liquid collection tank 24, a second wash return water valve 25, a first wash water tank 26, a first wash inlet valve 27, and a third wash return water valve. Valve 28, secondary wash water tank 29, secondary wash inlet valve 30, 4th wash return valve 31, 3rd wash water tank 32, 3rd wash inlet valve 33, second makeup water valve 34, second level transmitter 35, 4th wash water tank 36, 4th wash inlet valve 37, washing water pump 38, flow transmitter 39, electrical control system 40, hydraulic pump 2, hydraulic station 3, and vertical filter press 1 are connected via hydraulic pipelines. The 4th wash water tank 36 is equipped with the second makeup water valve 34, the second level transmitter 35, and the 4th wash inlet valve 37. The 3rd wash water tank 32 is equipped with the 4th wash return valve 31 and the 3rd wash inlet valve 33. The 2nd wash water tank 29 is equipped with the 3rd wash return valve 28 and the 2nd wash inlet valve 30. The 1st wash water tank 26 is equipped with... The system is equipped with a second wash return water valve 25 and a first wash inlet water valve 27; a wash liquid collection tank 24 is equipped with a first wash return water valve 23; a mother liquor tank 22 is equipped with a mother liquor valve 21; a gas-liquid separator 20 is equipped with an exhaust valve 19; a cleaning and squeezing water tank 16 is equipped with a first level transmitter 17 and a first water supply valve 18; a slurry tank 10 is equipped with a feed valve 7, a return valve 8, and a feed pump 9; the feed valve 7 is connected to a drying valve 4 and a washing valve 5 via pipelines; the return valve 8 is connected to a first pressure transmitter 6 via pipelines; the drying valve 4 and the washing valve 5 are connected to the first pressure transmitter 6 via pipelines; the first pressure transmitter 6 is connected to a vertical filter press 1 via pipelines; and a fourth wash inlet water valve 37 and a third wash inlet water valve 38 are also provided. Washing inlet valve 33, second washing inlet valve 30, and first washing inlet valve 27 are connected to washing water pump 38 via pipelines. Washing water pump 38 and washing valve 5 are connected to flow transmitter 39 via pipelines. Fourth washing return valve 31, third washing return valve 28, second washing return valve 25, first washing return valve 23, mother liquor valve 21, and vent valve 19 are connected to vertical filter press 1 via pipelines. Cleaning squeeze water tank 16 and vertical filter press 1 are connected via pipelines to pressure relief valve 14. Cleaning squeeze water tank 16 is equipped with cleaning squeeze water pump 15. Cleaning squeeze water pump 15 and vertical filter press 1 are connected via pipelines to second pressure transmitter 11, cleaning valve 12, and squeeze valve 13. Hydraulic pump 2 is connected to hydraulic station 3 and vertical filter press 1 via hydraulic pipelines. The hydraulic station 3 contains an electromagnetic reversing valve that switches the hydraulic pipelines to provide power to vertical filter press 1.The electrical control system 40 includes a PLC and a touch screen. The PLC loads the system control program, and the touch screen displays relevant system settings and control buttons. The electrical control system 40 is connected to the vertical filter press 1 and its auxiliary equipment via cables to control the operation of the entire system. The fourth wash water tank 36 is equipped with a second water supply valve 34 and a second level transmitter 35 for level display and water supply. The cleaning and squeezing water tank 16 is equipped with a first water supply valve 18 and a first level transmitter 17 for level display and water supply.

[0058] In one embodiment, such as Figure 1 As shown, the slurry tank 10 and the cleaning and squeezing water tank 16 are both located below the horizontal plane of the vertical filter press 1.

[0059] In one embodiment, such as Figure 1 As shown, the hydraulic station 3 is equipped with a solenoid directional valve. The solenoid directional valve of the hydraulic station 3 can control the hydraulic cylinder 42 to raise the cover plate 49 of the vertical filter press 1 to the open state.

[0060] In one embodiment, such as Figure 1 As shown, the electrical control system 40 includes a PLC and a touch screen. The electrical control system 40 is connected to the vertical filter press 1 and its auxiliary equipment via cables. The PLC and touch screen in the electrical control system 40 are used to load the system control program.

[0061] In one embodiment, such as Figures 2-5As shown, the vertical filter press 1 includes a base plate 41, a top plate 43, a feed box 44, a first fixed plate 46, a second fixed plate 47, a filtrate collection box 48, and a water tank 71. The second fixed plate 47 and the first fixed plate 46 are fixedly connected to the side wall of the base plate 41. The filtrate collection box 48 is fixedly connected to the upper surface of the second fixed plate 47. The feed box 44, the pressure booster 45, and the water tank 71 are fixedly connected to the upper surface of the first fixed plate 46. The top plate 43 is fixedly connected to the upper surfaces of the feed box 44, the pressure booster 45, the filtrate collection box 48, and the water tank 71. Two hydraulic cylinders 42 are fixedly connected through the upper surface of the top plate 43. A cover plate 49 is fixedly connected to the output ends of the two hydraulic cylinders 42. A gap is provided between the cover plate 49 and the base plate 41. Several filter press plates 51 are provided, each with a U-shaped cross-section. Each filter press plate 51 has a feed hole, a pressurizing hole, and a liquid outlet hole on its side wall. The feed box 44 is connected to the feed hole of the filter press plate 51 via a telescopic hose. The pressurizer 45 is connected to the pressurizing hole of the filter press plate 51 via a telescopic air pipe. The filtrate collection box 48 is connected to the liquid outlet hole of the filter press plate 51 via a telescopic hose. A clamping plate 52 is fixedly connected to the upper surface of the filter press plate 51. A clamping plate groove corresponding to the clamping plate 52 is provided on the lower surface of the filter press plate 51. The clamping plate 52 of the lower filter press plate 51 is slidably connected to the inner side wall of the clamping plate groove of the upper filter press plate 51. One-way valves are provided in the feed box 44, the pressurizer 45, the filtrate collection box 48, and the water supply box 71. Start the hydraulic cylinder 42, which drives the cover plate 49 to descend, causing the cover plate 49 to press the filter plates 51 together. The slurry is fed through the feed box 44 and then through the telescopic hose between two adjacent filter plates 51. Then start the pressurizer 45, which allows pressurized gas to be fed through the telescopic air pipe between two adjacent filter plates 51 to pressurize the slurry. At this time, the filtrate flows from the filter cloth 60 and the filtrate plate 55 into the upper part of the third fixed plate 54 and is discharged into the filtrate collection box 48 through the outlet hole. The remaining filter cake is located on the filter cloth 60.

[0062] In one embodiment, such as Figure 11 and Figure 12 As shown, two telescopic cylinder slots are formed on the upper surface of the filter press plate 51. Telescopic cylinders 65 are fixedly connected to the inner walls of the two slots. Telescopic rods 64 are slidably connected to the inner walls of the two telescopic cylinders 65. A damping spring is fixedly connected between the telescopic rods 64 and the inner walls of the telescopic cylinders 65. The bottom plate 41 is fixedly connected to the bottom filter press plate 51. The top filter press plate 51 is connected to the cover plate 49 through the telescopic rods 64. The top telescopic rods 64 are fixedly connected to the lower surface of the cover plate 49. When the hydraulic cylinder 42 is activated again, it drives the cover plate 49 to rise. The cover plate 49 drives several filter press plates 51 to rise through the telescopic rods 64. At this time, the telescopic rods 64 are pushed out of the telescopic cylinders 65 by the damping springs, thus separating each filter press plate 51.

[0063] In one embodiment, such as Figure 9 and Figure 10 As shown, the inner wall of the filter press plate 51 is rotatably connected to two first rotating shafts 57 via bearings. The two first rotating shafts 57 are driven by chains and sprockets. Each of the two first rotating shafts 57 is fixedly connected to a transmission roller 56. The two transmission rollers 56 cooperate with the filter cloth 60. The inner wall of the filter press plate 51 is fixedly connected to a filtrate plate 55. The side wall of the filtrate plate 55 has several filtrate holes. The side wall of the filter press plate 51 is fixedly connected to a third fixing plate 54 and a baffle 59. The outer wall of the filter press plate 51 is fixedly connected to a motor 50 via a bracket. One of the first rotating shafts 57 extends through the filter press plate 51 and is fixedly connected to the output end of the motor 50. The baffle 59 abuts against the filter cloth 60. The motor 50 is started, which drives the first rotating shaft 57 to rotate. The first rotating shaft 57 drives the transmission roller 56 to rotate, and the transmission roller 56 drives the filter cloth 60 to rotate. The rotation of the filter cloth 60 causes the filter cake on the surface of the filter cloth 60 to fall off the filter press plate 51. The baffle 59 can also scrape off the filter cake that is attached to the surface of the filter cloth 60 and has not fallen off, so as to prevent the filter cake from being left behind and affecting the next filter press of the filter cloth 60.

[0064] In one embodiment, such as Figure 7 and Figure 10 As shown, the filter press plate 51 has several spray holes on its side wall, each with a spray head 67. A spray box 66 is fixedly connected to the outer side wall of the filter press plate 51, and the portions of the spray heads 67 outside the filter press plate 51 are all located inside the spray box 66. The spray boxes 66 are all connected to the water supply tank 71 via telescopic water pipes. When the upper half of the filter cloth 60, which has just finished filtration, rotates to the lower position via the drive roller 56, the spray heads 67 are activated to rinse the upper half of the filter cloth 60 that has just been used for filtration, preventing the filter cloth 60 from being clogged by filter residue during the next use and improving the filtration effect. The waste liquid left after rinsing can be discharged into the filtrate collection tank 48 through the outlet hole, while the lower half of the original filter cloth 60 is rotated to the upper position, ready for a new filtration operation. The filter cloth 60 can be directly cleaned after washing, improving the filtration efficiency.

[0065] In one embodiment, such as Figure 11 and Figure 13As shown, a movable block groove is provided inside the filter press plate 51. An electric push rod 58 is fixedly connected to the inner side wall of the movable block groove. Two fixed rods 63 are fixedly connected to the inner side wall of the movable block groove. A movable block 61 is slidably connected to the inner side wall of the movable block groove. A scraper 53 is slidably connected to the inner side wall of the filter press plate 51. The lower surface of the scraper 53 abuts against the filter cloth 60. Two damping spring grooves 70 are provided on the side wall of the movable block 61. A damping spring is fixedly connected to the inner side wall of the scraper 53 and the damping spring groove 70. A second rotating shaft groove 69 is provided on the side wall of the movable block 61. Two second rotating shafts 68 are rotatably connected to the bottom wall of the second rotating shaft groove 69 through bearings. A coil spring is provided between the second rotating shaft 68 and the bottom wall of the second rotating shaft groove 69. A cam is fixedly connected to the second rotating shaft 68. The cam abuts against the side wall of the scraper 53. A pull rope 62 is wound on the second rotating shaft 68. The end of the pull rope 62 away from the second rotating shaft 68 extends through the movable block groove and is fixedly connected to the fixed rod 63. As the filter cloth 60 rotates, the electric push rod 58 is activated. The electric push rod 58 drives the moving block 61 forward, which in turn drives the scraper 53 forward. The scraper 53 further scrapes away the filter cake adhering to the inner wall of the filter press plate 51, increasing the filter cake discharge rate. Simultaneously, the moving block 61 moves, pulling the pull rope 62, causing it to gradually loosen from the electric push rod 58. When the pull rope 62 loosens, it drives the second rotating shaft 68 to rotate. The rotation of the second rotating shaft 68 drives the cam to rotate, and the cam strikes the side wall of the scraper 53, causing... The scraper 53 reciprocates under the action of the damping spring and the cam. At this time, the scraper 53 can scrape off the filter cake residue on the inner wall of the filter press plate 51, and can also reciprocate to shake off the filter cake residue attached to the side wall of the scraper 53, so as to avoid the filter cake residue from adhering to the side wall of the filter press plate 51 and the scraper 53, which would lead to filter cake residue waste and further improve the discharge rate of the filter cake. When the electric push rod 58 drives the moving block 61 to move back, it drives the second rotating shaft 68 to reset and rotate through the coil spring. At this time, the pull rope 62 is wound around the second rotating shaft 68 again.

[0066] The above embodiments disclose a four-stage countercurrent washing device and method for a vertical filter press. First, the relevant parameters are located and set on the touch screen of the electronic control system 40. After the relevant parameters are set, the start button is pressed to start the control system. First, the hydraulic pump 2 is started, and the solenoid reversing valve of the hydraulic station 3 is switched to loosen the filter cloth of the vertical filter press 1 into place. Then, the plates are lowered to a sealed state to prepare for feeding.

[0067] The feeding process begins with opening the feed valve 7 and mother liquor valve 21, starting the feed pump 9, and pumping the slurry from the slurry tank 10 into the plates of the vertical filter press 1. The filtrate filtered through the filter cloth flows into the mother liquor tank 22. When the feeding time reaches the set value, or when the value of the first pressure transmitter 6 exceeds the set value of the feeding pressure, the feeding process ends, the feed pump 9 is stopped, and the feed valve 7 and mother liquor valve 21 are closed.

[0068] In the material return process, after the feeding process is completed, the material return valve 8 is opened, and the slurry remaining in the pipeline is returned to the slurry tank 10 by its own weight. When the set material return time is reached, the material return process ends and the material return valve 8 is closed.

[0069] In one pressing process, the pressing valve 13 and the mother liquor valve 21 are opened, and the cleaning pressing water pump 15 is started. The pressing water is pumped from the cleaning pressing water tank 16 into the plate diaphragm of the vertical filter press 1 to press the filter cake. The filtrate filtered through the filter cloth flows into the mother liquor tank 22. When the time reaches the set value for one pressing time, or when the value of the second pressure transmitter 11 exceeds the set value for one pressing pressure, the pressing process ends, the cleaning pressing water pump 15 is stopped, and the pressing valve 13 and the mother liquor valve 21 are closed.

[0070] In one pressure relief process, the pressure relief valve 14 is opened, and the squeezed water in the diaphragm of the vertical filter press 1 is returned to the cleaning squeezed water tank 16. When the time reaches the set value for one pressure relief time, the pressure relief process ends and the pressure relief valve 14 is closed.

[0071] In one washing cycle, the washing valve 5, the first washing inlet valve 27, and the first washing return valve 23 are opened, and the washing water pump 38 is started. The washing liquid is pumped from the first washing water tank 26 into the plates of the vertical filter press 1. The filtrate filtered through the filter cloth flows into the washing liquid collection tank 24. When the time reaches the set value for one washing cycle, or when the value of the flow transmitter 39 exceeds the set value for one washing flow rate, the washing cycle ends, the washing water pump 38 is stopped, and the washing valve 5, the first washing inlet valve 27, and the first washing return valve 23 are closed.

[0072] In the secondary pressing process, the pressing valve 13 and the first wash return water valve 23 are opened, and the cleaning pressing water pump 15 is started. The pressing water is pumped from the cleaning pressing water tank 16 into the plate diaphragm of the vertical filter press 1 to press the filter cake. The filtrate filtered through the filter cloth flows into the washing liquid collection tank 24. When the time reaches the secondary pressing time setting value, or the value of the second pressure transmitter 11 exceeds the secondary pressing pressure setting value, the secondary pressing process ends, the cleaning pressing water pump 15 is stopped, and the pressing valve 13 and the first wash return water valve 23 are closed.

[0073] In the secondary pressure relief process, the pressure relief valve 14 is opened, and the squeezed water in the diaphragm of the vertical filter press 1 is returned to the cleaning squeezed water tank 16. When the set time for the secondary pressure relief is reached, the secondary pressure relief process ends, and the pressure relief valve 14 is closed.

[0074] In the secondary washing process, the washing valve 5, the secondary washing inlet valve 30, and the secondary washing return valve 25 are opened, and the washing water pump 38 is started. The washing liquid is pumped from the secondary washing water tank 29 into the plates of the vertical filter press 1, and the filtrate filtered through the filter cloth flows into the primary washing water tank 26. When the time reaches the secondary washing time setting value, or the value of the flow transmitter 39 exceeds the secondary washing flow setting value, the secondary washing process ends, the washing water pump 38 is stopped, and the washing valve 5, the secondary washing inlet valve 30, and the secondary washing return valve 25 are closed.

[0075] The three-stage pressing process begins with opening the pressing valve 13 and the second wash return water valve 25, and starting the cleaning pressing water pump 15. The pressing water is pumped from the cleaning pressing water tank 16 into the diaphragm of the vertical filter press 1, pressing the filter cake. The filtrate filtered through the filter cloth flows into the first wash water tank 26. When the time reaches the set value for the three-stage pressing time, or when the value of the second pressure transmitter 11 exceeds the set value for the three-stage pressing pressure, the three-stage pressing process ends, the cleaning pressing water pump 15 is stopped, and the pressing valve 13 and the second wash return water valve 25 are closed.

[0076] The three-stage pressure relief process begins by opening pressure relief valve 14, allowing the squeezed water within the diaphragm of the vertical filter press to return to the cleaning squeezed water tank 16. Once the set time for the three-stage pressure relief process is reached, the three-stage pressure relief process ends, and pressure relief valve 14 is closed.

[0077] The three-wash process begins with the washing valve 5, the third-wash inlet valve 33, and the third-wash return valve 28 open. The washing water pump 38 is then started, pumping the washing liquid from the third-wash water tank 32 into the plates of the vertical filter press 1. The filtrate filtered through the filter cloth flows into the second-wash water tank 29. When the set time for the three-wash process is reached, or when the value of the flow transmitter 39 exceeds the set flow rate for the three-wash process, the three-wash process ends, the washing water pump 38 is stopped, and the washing valve 5, the third-wash inlet valve 33, and the third-wash return valve 28 are closed.

[0078] In the four-stage pressing process, the pressing valve 13 and the third-wash return water valve 28 are opened, and the cleaning pressing water pump 15 is started. The pressing water is pumped from the cleaning pressing water tank 16 into the plate diaphragm of the vertical filter press 1 to press the filter cake. The filtrate filtered through the filter cloth flows into the second-wash water tank 29. When the time reaches the set value for the four-stage pressing time, or when the value of the second pressure transmitter 11 exceeds the set value for the four-stage pressing pressure, the four-stage pressing process ends, the cleaning pressing water pump 15 is stopped, and the pressing valve 13 and the third-wash return water valve 28 are closed.

[0079] In the four-stage pressure relief process, the pressure relief valve 14 is opened, and the squeezed water in the diaphragm of the vertical filter press 1 is returned to the cleaning squeezed water tank 16. When the time reaches the set value for the four-stage pressure relief process, the four-stage pressure relief process ends, and the pressure relief valve 14 is closed.

[0080] The four-wash process begins with the washing valve 5, the fourth-wash inlet valve 37, and the fourth-wash return valve 31 open. The washing water pump 38 is then started, and the washing liquid is pumped from the fourth-wash water tank 36 into the plates of the vertical filter press 1. The filtrate filtered through the filter cloth flows into the third-wash water tank 32. When the time reaches the set value for the four-wash time, or when the value of the flow transmitter 39 exceeds the set value for the four-wash flow rate, the four-wash process ends, the washing water pump 38 is stopped, and the washing valve 5, the fourth-wash inlet valve 37, and the fourth-wash return valve 31 are closed.

[0081] The five-stage pressing process begins with opening the pressing valve 13 and the fourth-wash return water valve 31, and starting the cleaning pressing water pump 15. The pressing water is pumped from the cleaning pressing water tank 16 into the diaphragm of the vertical filter press 1, pressing the filter cake. The filtrate filtered through the filter cloth flows into the third-wash water tank 32. When the time reaches the set value for the five-stage pressing, or when the value of the second pressure transmitter 11 exceeds the set value for the five-stage pressing pressure, the five-stage pressing process ends, the cleaning pressing water pump 15 is stopped, and the pressing valve 13 and the fourth-wash return water valve 31 are closed.

[0082] The five-stage pressure relief process begins by opening pressure relief valve 14, allowing the squeezed water within the diaphragm of the vertical filter press 1 to return to the cleaning squeezed water tank 16. Once the set time for the five-stage pressure relief process is reached, the process ends, and pressure relief valve 14 is closed.

[0083] In one drying cycle, the exhaust valve 19 and the drying valve 4 are opened, and compressed air for drying enters the plates of the vertical filter press 1. The air-water filtrate filtered through the filter cloth flows into the gas-liquid separator 20. When the set drying time for one cycle is reached, the drying cycle ends, and the drying valve 4 and the exhaust valve 19 are closed.

[0084] In one exhaust process, exhaust valve 19 is opened to discharge the residual dried air in the plates and filtrate pipes of the vertical filter press 1 into the gas-liquid separator 20. When the set exhaust time is reached, one exhaust process ends and exhaust valve 19 is closed.

[0085] The solenoid directional valve of hydraulic station 3 is then switched to raise the plates of vertical filter press 1 to the open state. After the filter cloth is tensioned, it enters the unloading process. During unloading, cleaning valve 12 is opened, and cleaning and squeezing water pump 15 is started to drive the filter cloth, unloading the filter cake onto the receiving device below. The filter cloth is cleaned while unloading. After the filter cake is removed, the unloading process ends, cleaning and squeezing water pump 15 is stopped, cleaning valve 12 is closed, and the filter cloth movement stops.

[0086] In this embodiment, the filter cloth cleaning water and the filter cake squeezing water can be used separately in the process, so sharing a set of cleaning squeezing water pump 15, cleaning squeezing water tank 16, first liquid level transmitter 17, and first water supply valve 18 can save costs.

[0087] The method of using the vertical filter press in this invention:

[0088] Start the hydraulic cylinder 42, which drives the cover plate 49 to descend, causing the cover plate 49 to press the filter plates 51 together. The slurry is fed through the feed box 44 and then through the telescopic hose between two adjacent filter plates 51. Then start the pressurizer 45, which allows pressurized gas to be fed through the telescopic air pipe between two adjacent filter plates 51 to pressurize the slurry. At this time, the filtrate flows from the filter cloth 60 and the filtrate plate 55 into the upper part of the third fixed plate 54 and is discharged into the filtrate collection box 48 through the outlet hole. The remaining filter cake is located on the filter cloth 60.

[0089] The hydraulic cylinder 42 is restarted, which drives the cover plate 49 to rise. The cover plate 49 drives several filter plates 51 to rise through the telescopic rod 64. At this time, the telescopic rod 64 is pushed out of the telescopic cylinder 65 by the damping spring, so that each filter plate 51 is separated. The motor 50 is started at this time, which drives the first rotating shaft 57 to rotate. The first rotating shaft 57 drives the transmission roller 56 to rotate. The transmission roller 56 drives the filter cloth 60 to rotate. The rotation of the filter cloth 60 causes the filter cake on the surface of the filter cloth 60 to fall off the filter plate 51. The baffle 59 can also scrape off the filter cake that is not fallen off the surface of the filter cloth 60 to prevent the filter cake from being left unremoved and affecting the next filter pressing of the filter cloth 60.

[0090] When the upper half of the filter cloth 60, which has just been pressed and filtered, rotates to the lower position via the drive roller 56, the water spray head 67 is activated. The water spray head 67 washes the upper half of the filter cloth 60 that has just been used for pressing and filtration, preventing the filter cloth 60 from being clogged by filter residue when used again, thus improving the pressing and filtration effect. The waste liquid left after rinsing can be discharged into the filtrate collection box 48 through the liquid outlet, while the original lower half of the filter cloth 60 is rotated to the upper position, ready for a new pressing and filtration operation. The filter cloth 60 can be cleaned directly after washing, thus improving the pressing and filtration efficiency.

[0091] As the filter cloth 60 rotates, the electric push rod 58 is activated. The electric push rod 58 drives the moving block 61 forward, which in turn drives the scraper 53 forward. The scraper 53 further scrapes away the filter cake adhering to the inner wall of the filter press plate 51, increasing the filter cake discharge rate. Simultaneously, the moving block 61 moves, pulling the pull rope 62, causing it to gradually loosen from the electric push rod 58. When the pull rope 62 loosens, it drives the second rotating shaft 68 to rotate. The rotation of the second rotating shaft 68 drives the cam to rotate, and the cam strikes the side wall of the scraper 53, causing... The scraper 53 reciprocates under the action of the damping spring and the cam. At this time, the scraper 53 can scrape off the filter cake residue on the inner wall of the filter press plate 51, and can also reciprocate to shake off the filter cake residue attached to the side wall of the scraper 53, so as to avoid the filter cake residue from adhering to the side wall of the filter press plate 51 and the scraper 53, which would lead to filter cake residue waste and further improve the discharge rate of the filter cake. When the electric push rod 58 drives the moving block 61 to move back, it drives the second rotating shaft 68 to reset and rotate through the coil spring. At this time, the pull rope 62 is wound around the second rotating shaft 68 again.

[0092] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A four-stage countercurrent washing device for a vertical filter press, comprising a vertical filter press (1), characterized in that, The vertical filter press (1) includes a bottom plate (41), a top plate (43), a feed box (44), a first fixed plate (46), a second fixed plate (47), a filtrate collection box (48), and a water tank (71). The second fixed plate (47) and the first fixed plate (46) are fixedly connected to the side wall of the bottom plate (41). The filtrate collection box (48) is fixedly connected to the upper surface of the second fixed plate (47). The feed box (44), the pressure booster (45), and the water tank (71) are fixedly connected to the upper surface of the first fixed plate (46). The top plate (43) is fixedly connected to the upper surface of the feed box (44), the pressure booster (45), the filtrate collection box (48), and the water tank (71). Two hydraulic cylinders (42) are fixedly connected through the upper surface of the top plate (43). The output ends of the two hydraulic cylinders (42) are fixedly connected to a cover plate (49). The cover plate (49) and the bottom plate (41) are connected together. Several filter press plates (51) are arranged in the middle. The filter press plates (51) have a U-shaped cross-section. Each of the filter press plates (51) has a feed hole, a pressurizing hole, and a liquid outlet hole on its side wall. The feed box (44) is connected to the feed hole of the filter press plate (51) through a telescopic hose. The pressurizer (45) is connected to the pressurizing hole of the filter press plate (51) through a telescopic air pipe. The filtrate collection box (48) is connected to the liquid outlet hole of the filter press plate (51) through a telescopic air pipe. The filter press (51) is connected to a flexible hose. A clamping plate (52) is fixedly connected to the upper surface of the filter press (51). A clamping plate groove corresponding to the clamping plate (52) is opened on the lower surface of the filter press (51). The clamping plate (52) of the lower filter press (51) is slidably connected to the inner side wall of the clamping plate groove of the upper filter press (51). One-way valves are provided in the feed box (44), the pressurizer (45), the filtrate collection box (48), and the water supply box (71). The filter press plate (51) has a movable block groove, and an electric push rod (58) is fixedly connected to the inner side wall of the movable block groove. Two fixed rods (63) are fixedly connected to the inner side wall of the movable block groove. A movable block (61) is slidably connected to the inner side wall of the movable block groove. A scraper (53) is slidably connected to the inner side wall of the filter press plate (51). The lower surface of the scraper (53) abuts against the filter cloth (60). Two damping spring grooves (70) are opened on the side wall of the movable block (61). A damping spring is fixedly connected to the inner side wall of the scraper (53) and the damping spring groove (70). The side wall of the block (61) is provided with a second rotating shaft groove (69). The bottom wall of the second rotating shaft groove (69) is rotatably connected to two second rotating shafts (68) through bearings. A coil spring is provided between the second rotating shaft (68) and the bottom wall of the second rotating shaft groove (69). A cam is fixedly connected to the second rotating shaft (68). The cam abuts against the side wall of the scraper (53). A pull rope (62) is wound on the second rotating shaft (68). The end of the pull rope (62) away from the second rotating shaft (68) extends through the groove of the moving block and is fixedly connected to the fixed rod (63).

2. The vertical filter press four-stage countercurrent washing device according to claim 1, characterized in that, It also includes a hydraulic pump (2), a hydraulic station (3), a drying valve (4), a washing valve (5), a first pressure transmitter (6), a feed valve (7), a return valve (8), a feed pump (9), a slurry tank (10), a second pressure transmitter (11), a cleaning valve (12), a squeezing valve (13), a pressure relief valve (14), a cleaning squeezing water pump (15), a cleaning squeezing water tank (16), a first level transmitter (17), a first water supply valve (18), an exhaust valve (19), a gas-liquid separator (20), a mother liquor valve (21), a mother liquor tank (22), a first wash return water valve (23), a washing liquid collection tank (24), a second wash return water valve (25), a first wash water tank (26), a first wash inlet valve (27), a third wash return water valve (28), and a second wash water tank. (29), Second Wash Inlet Valve (30), Fourth Wash Return Valve (31), Third Wash Water Tank (32), Third Wash Inlet Valve (33), Second Makeup Valve (34), Second Level Transmitter (35), Fourth Wash Water Tank (36), Fourth Wash Inlet Valve (37), Washing Water Pump (38), Flow Transmitter (39), Electrical Control System (40), the hydraulic pump (2), hydraulic station (3) and vertical filter press (1) are connected by hydraulic pipelines, the fourth wash water tank (36) is equipped with the second makeup valve (34), the second level transmitter (35) and the fourth wash inlet valve (37), the third wash water tank (32) is equipped with the fourth wash return valve (31) and the third wash inlet valve (33), the second wash water tank (29) is equipped with the third wash return valve (28) and The second wash inlet valve (30), the first wash tank (26) is equipped with a second wash return valve (25) and a first wash inlet valve (27), the wash liquid collection tank (24) is equipped with a first wash return valve (23), the mother liquor tank (22) is equipped with a mother liquor valve (21), the gas-liquid separator (20) is equipped with an exhaust valve (19), the cleaning squeeze water tank (16) is equipped with a first level transmitter (17) and a first water supply valve (18), the slurry tank (10) is equipped with a feed valve (7), a return valve (8) and a feed pump (9), the feed valve (7) is connected to a drying valve (4) and a washing valve (5) through a pipeline, the return valve (8) is connected to a first pressure transmitter (6) through a pipeline, the drying valve (4) and the washing valve (5) The first pressure transmitter (6) is connected to the vertical filter press (1) through a pipeline. The fourth wash inlet valve (37), the third wash inlet valve (33), the second wash inlet valve (30), and the first wash inlet valve (27) are connected to the washing water pump (38) through a pipeline. The washing water pump (38) and the washing valve (5) are connected to the flow transmitter (39) through a pipeline. The fourth wash return valve (31), the third wash return valve (28), the second wash return valve (25), the first wash return valve (23), the mother liquor valve (21), and the exhaust valve (19) are connected to the vertical filter press (1) through a pipeline. The cleaning squeeze water tank (16) and the vertical filter press (1) are connected to the pressure relief valve (14) through a pipeline.The cleaning and squeezing water tank (16) is equipped with a cleaning and squeezing water pump (15). The cleaning and squeezing water pump (15) is connected to the vertical filter press (1) via a pipeline, which includes a second pressure transmitter (11), a cleaning valve (12), and a squeezing valve (13).

3. The vertical filter press four-stage countercurrent washing device according to claim 2, characterized in that, The slurry tank (10) and the cleaning and squeezing water tank (16) are both located below the horizontal plane of the vertical filter press (1).

4. The vertical filter press four-stage countercurrent washing device according to claim 3, characterized in that, The hydraulic station (3) is equipped with an electromagnetic directional valve.

5. A vertical filter press four-stage countercurrent washing device according to claim 4, characterized in that, The electrical control system (40) includes a PLC and a touch screen. The electrical control system (40) is connected to the vertical filter press (1) and its supporting equipment via cables.

6. The vertical filter press four-stage countercurrent washing device according to claim 1, characterized in that, The filter press plate (51) has two telescopic cylinder grooves on its upper surface. The inner walls of the two telescopic cylinder grooves are fixedly connected to telescopic cylinders (65). The inner walls of the two telescopic cylinders (65) are slidably connected to telescopic rods (64). A damping spring is fixedly connected between the telescopic rods (64) and the inner walls of the telescopic cylinders (65). The bottom plate (41) is fixedly connected to the bottom filter press plate (51). The top filter press plate (51) is connected to the cover plate (49) through the telescopic rods (64). The top telescopic rods (64) are fixedly connected to the lower surface of the cover plate (49).

7. A vertical filter press four-stage countercurrent washing device according to claim 1, characterized in that, The inner wall of the filter press plate (51) is rotatably connected to two first rotating shafts (57) via bearings. The two first rotating shafts (57) are driven by chains and sprockets. Each of the two first rotating shafts (57) is fixedly connected to a transmission roller (56). The two transmission rollers (56) cooperate with the filter cloth (60). The inner wall of the filter press plate (51) is fixedly connected to a filtrate plate (55). The side wall of the filtrate plate (55) is provided with several filtrate holes. The side wall of the filter press plate (51) is fixedly connected to a third fixing plate (54) and a baffle (59). The outer wall of the filter press plate (51) is fixedly connected to a motor (50) via a bracket. One of the first rotating shafts (57) extends through to the outside of the filter press plate (51) and is fixedly connected to the output end of the motor (50). The baffle (59) abuts against the filter cloth (60).

8. A four-stage countercurrent washing device for a vertical filter press according to claim 7, characterized in that, The filter press plate (51) has several spray holes on its side wall, and each of the spray holes is equipped with a spray head (67). A spray box (66) is fixedly connected to the outer side wall of the filter press plate (51). The portions of the spray heads (67) located outside the filter press plate (51) are all located inside the spray box (66). The spray boxes (66) are all connected to the water supply box (71) through telescopic water pipes.

9. A method of using the four-stage countercurrent washing device for a vertical filter press as described in claim 2, characterized in that, Includes the following steps: Step 1: First, find the relevant parameters in the touch screen of the electronic control system (40) and set them. After the relevant parameters are set, press the start button to start the control system. Then start the hydraulic pump (2), switch the electromagnetic reversing valve of the hydraulic station (3), loosen the filter cloth of the vertical filter press (1) into place, and then lower the plate to the plate sealed state to prepare for feeding. Step 2: Feeding process. Open the feed valve (7) and mother liquor valve (21), start the feed pump (9), and the slurry is pumped from the slurry tank (10) into the plate layer of the vertical filter press (1). The filtrate filtered through the filter cloth flows into the mother liquor tank (22). When the time reaches the feeding time setting value, or the value of the first pressure transmitter (6) exceeds the feeding pressure setting value, the feeding process ends, the feed pump (9) is stopped, and the feed valve (7) and mother liquor valve (21) are closed. Step 3: Material return process. After the feeding process is completed, open the material return valve (8) to return the slurry remaining in the pipeline to the slurry tank (10) by its own weight. When the time reaches the set value of the material return time, end the material return process and close the material return valve (8). Step 4: First squeeze process. Open the squeeze valve (13) and mother liquor valve (21), start the cleaning squeeze water pump (15), and squeeze water is pumped from the cleaning squeeze water tank (16) into the plate diaphragm of the vertical filter press (1) to squeeze the filter cake; the filtrate filtered through the filter cloth flows into the mother liquor tank (22); when the time reaches the set value of the first squeeze time, or the value of the second pressure transmitter (11) exceeds the set value of the first squeeze pressure, end the first squeeze process, stop the cleaning squeeze water pump (15), and close the squeeze valve (13) and mother liquor valve (21). Step 5: First pressure relief process. Open the pressure relief valve (14). The squeeze water in the diaphragm of the vertical filter press (1) is returned to the cleaning squeeze water tank (16). When the time reaches the first pressure relief time setting value, the first pressure relief process ends and the pressure relief valve (14) is closed. Step 6: For a single washing process, open the washing valve (5), the first washing inlet valve (27), and the first washing return valve (23), and start the washing water pump (38). The washing liquid is pumped from the first washing water tank (26) into the plates of the vertical filter press (1). The filtrate filtered through the filter cloth flows into the washing liquid collection tank (24). When the time reaches the set value of the first washing time, or the value of the flow transmitter (39) exceeds the set value of the first washing flow, end the single washing process, stop the washing water pump (38), and close the washing valve (5), the first washing inlet valve (27), and the first washing return valve (23). Step 7: Secondary squeezing process. Open the squeezing valve (13) and the first wash return water valve (23), start the cleaning squeezing water pump (15), and pump the squeezing water from the cleaning squeezing water tank (16) into the plate diaphragm of the vertical filter press (1) to squeeze the filter cake; the filtrate filtered through the filter cloth flows into the washing liquid collection tank (24); when the time reaches the secondary squeezing time setting value, or the value of the second pressure transmitter (11) exceeds the secondary squeezing pressure setting value, end the secondary squeezing process, stop the cleaning squeezing water pump (15), and close the squeezing valve (13) and the first wash return water valve (23). Step 8: Secondary pressure relief process. Open the pressure relief valve (14) and return the squeezed water in the diaphragm of the vertical filter press (1) to the cleaning squeezed water tank (16). When the time reaches the secondary pressure relief time setting value, end the secondary pressure relief process and close the pressure relief valve (14). Step 9: Secondary washing process. Open the washing valve (5), the secondary washing inlet valve (30), and the secondary washing return valve (25). Start the washing water pump (38). The washing liquid is pumped from the secondary washing tank (29) into the plates of the vertical filter press (1). The filtrate filtered through the filter cloth flows into the primary washing tank (26). When the time reaches the secondary washing time setting value, or the value of the flow transmitter (39) exceeds the secondary washing flow setting value, end the secondary washing process, stop the washing water pump (38), and close the washing valve (5), the secondary washing inlet valve (30), and the secondary washing return valve (25). Step 10: Three-stage squeezing process. Open the squeezing valve (13) and the second wash return water valve (25), start the cleaning squeezing water pump (15), and pump the squeezing water from the cleaning squeezing water tank (16) into the plate diaphragm of the vertical filter press (1) to squeeze the filter cake; the filtrate filtered through the filter cloth flows into the first wash water tank (26); when the time reaches the three-stage squeezing time setting value, or the value of the second pressure transmitter (11) exceeds the three-stage squeezing pressure setting value, end the three-stage squeezing process, stop the cleaning squeezing water pump (15), and close the squeezing valve (13) and the second wash return water valve (25). Step 11: Three-stage pressure relief process. Open the pressure relief valve (14) and return the squeezed water in the diaphragm of the vertical filter press (1) to the cleaning squeezed water tank (16). When the time reaches the three-stage pressure relief time setting value, end the three-stage pressure relief process and close the pressure relief valve (14). Step 12: Three-wash process. Open the washing valve (5), the three-wash inlet valve (33), and the three-wash return valve (28). Start the washing water pump (38). The washing liquid is pumped from the three-wash water tank (32) into the plates of the vertical filter press (1). The filtrate filtered through the filter cloth flows into the two-wash water tank (29). When the time reaches the three-wash time setting value, or the value of the flow transmitter (39) exceeds the three-wash flow setting value, end the three-wash process, stop the washing water pump (38), and close the washing valve (5), the three-wash inlet valve (33), and the three-wash return valve (28). Step 13: Four-stage squeezing process. Open the squeezing valve (13) and the three-wash return water valve (28), start the cleaning squeezing water pump (15), and pump the squeezing water from the cleaning squeezing water tank (16) into the plate diaphragm of the vertical filter press (1) to squeeze the filter cake; the filtrate filtered through the filter cloth flows into the second washing water tank (29); when the time reaches the four-stage squeezing time setting value, or the value of the second pressure transmitter (11) exceeds the four-stage squeezing pressure setting value, end the four-stage squeezing process, stop the cleaning squeezing water pump (15), and close the squeezing valve (13) and the three-wash return water valve (28). Step 14: Four-stage pressure relief process. Open the pressure relief valve (14) and return the squeezed water in the diaphragm of the vertical filter press (1) to the cleaning squeezed water tank (16). When the time reaches the four-stage pressure relief time setting value, end the four-stage pressure relief process and close the pressure relief valve (14). Step 15: Four-wash process. Open the washing valve (5), the fourth-wash inlet valve (37), and the fourth-wash return valve (31). Start the washing water pump (38). The washing liquid is pumped from the fourth-wash water tank (36) into the plates of the vertical filter press (1). The filtrate filtered through the filter cloth flows into the third-wash water tank (32). When the time reaches the four-wash time setting value, or the value of the flow transmitter (39) exceeds the four-wash flow setting value, end the four-wash process, stop the washing water pump (38), and close the washing valve (5), the fourth-wash inlet valve (37), and the fourth-wash return valve (31). Step 16: Five-times squeezing process. Open the squeezing valve (13) and the fourth wash return water valve (31), start the cleaning squeezing water pump (15), and pump the squeezing water from the cleaning squeezing water tank (16) into the plate diaphragm of the vertical filter press (1) to squeeze the filter cake; the filtrate filtered through the filter cloth flows into the third wash water tank (32); when the time reaches the five-times squeezing time setting value, or the value of the second pressure transmitter (11) exceeds the five-times squeezing pressure setting value, end the five-times squeezing process, stop the cleaning squeezing water pump (15), and close the squeezing valve (13) and the fourth wash return water valve (31). Step 17: Five-stage pressure relief process. Open the pressure relief valve (14) and return the squeezed water in the diaphragm of the vertical filter press (1) to the cleaning squeezed water tank (16). When the time reaches the five-stage pressure relief time setting value, end the five-stage pressure relief process and close the pressure relief valve (14). Step 18: For the first air drying process, open the exhaust valve (19) and the air drying valve (4). The compressed air for air drying enters the plates of the vertical filter press (1). The gas-water filtrate filtered through the filter cloth flows into the gas-liquid separator (20). When the time reaches the set value of the first air drying time, the first air drying process ends, and the air drying valve (4) and the exhaust valve (19) are closed. Step 19: First exhaust process. Open the exhaust valve (19) to discharge the residual dried air in the plates of the vertical filter press (1) and the filtrate pipe into the gas-liquid separator (20); when the time reaches the first exhaust time setting value, end the first exhaust process and close the exhaust valve (19). Step 20: Switch the solenoid directional valve of the hydraulic station (3) to raise the plate of the vertical filter press (1) to the plate open state. After the filter cloth is tightened, it enters the unloading process.

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