Diaphragm type plate and frame filter pressIt is the commonly used equipment in tailing coal treatment and dewatering in coal processing plant, which is widely used due to its advantages of strong processing capacity, good dewatering effect, low noise, low energy consumption and so on. Guandi Coal Processing Plant, as the supporting pit-head coal processing plant of Guandi Mine, most of the coal transported during the production process of raw coal mining is mixed with mud and sand rocks, and these impurities and coal are mixed to form coal sludge, so it is necessary to use special filtration equipment for filtration and processing work. Plate and frame filter press as a commonly used filtration equipment in coal mines, its performance directly affects the economic benefits of coal mines, based on this, to strengthen the plate and frame filter press equipment to improve the processing, enhance the efficiency of the plate and frame filter press is extremely important. This paper will optimise the performance of the filter press from the perspective of improving the design of the plate and frame filter press pulling device, to provide reference for the optimisation and upgrading of the coal mine filter press.

1 Overview of Guandi Coal Processing PlantGuandi Coal Processing Plant is a pit-type coal processing plant supporting the construction of Guandi Mine of Xishan Coal and Electricity Group, with a design capacity of 400×104t/aThe raw coal to be washed comes from the Guandi Mine and is a high quality fat coal. The use of desliming non-pressure feeding three products heavy media+Screw sorting machine+Combined flotation process flow. The dewatering of the flotation concentrate at this plant is performed by two ZKG450/2000-U The quick release diaphragm filter press is complete.

2 Plate and frame filter pressThe overall design of the plate and frame filter press is the use of pressure pumps, the slurry will be pumped into the two adjacent filter plate formed in the closed space, the formation of a pressure difference between the two sides of the filter cloth, so as to achieve the effect of solid-liquid separation. Plate and frame filter press consists of material transport system, filtration system and line system. The material transport system consists of four parts: motor, base, coupling and hydraulic pump; the filtration system consists of plate pulling device, fixed filter plate, filter plate and frame, beam, support and accessories, plate pulling assembly, filter cloth and filter paper, etc.; the line system mainly consists of two parts: the disc assembly and the steel pipe.[1]. Figures. 1 because of ZKG450/2000-U Schematic diagram of a type plate and frame filter press.

3 Plate and frame filter press pulling device composition and working principle of the pulling device as a whole is through the thrust plate, compression device, base and hydraulic cylinders and various components.The working principle of the pull plate device is driven by the piston in the hydraulic pump in the cylinder to drive the pull plate device for tensioning activities, through this tensioning activities to squeeze the thrust plate, the thrust plate to remain fixed in order to play the effect of extruding the mud, to achieve the effective extrusion of the filter cloth. This process will produce a large extrusion pressure, reasonable selection of component materials will enhance the overall performance of the strength of the pull plate device. Usually in the plate and frame filter press above the design of the steel plate for the crushing of mud, falling into the plate and frame filter press after the crushing of mud through the steel grille will be due to the impact of the crushing into small pieces of cake, small pieces of cake will be conducive to the subsequent transfer and storage, the size of this grille can be flexibly adjusted according to the body of the size of the mud cake. Slope treatment is carried out at the discharge opening, and the treated material will have a 3/1000 The downward slope of the conveyor belt also ensures that the water on the conveyor belt can flow along this slope without accumulating on the conveyor belt. The filtration process starts at the inlet, where the mud enters the inlet and is uniformly transported through the filter chambers, where it is centrifuged by a centrifugal pump for solid-liquid separation, and where the solids are compressed and retained in the filter chambers in the form of a sludge cake. After air-drying process in the air-drying interface, the moisture content of the solid part will be greatly reduced and transferred to the next outlet.

4 Optimisation of plate and frame filter press pulling devices

4.1 The selection of the material of the pulling plate material on the pulling plate machine frame selection can significantly improve the strength of the pulling plate device and the overall structural performance, in the improvement of the design of the frame beams will be selected Q345 Model materials for welding, and the key parts of the structure to strengthen the processing, to ensure that the entire frame has a high structural strength, to ensure that the pulling device for pulling the plate operation will not occur when the beam deformation and torsion of the problem. At the same time, the material of plate frame including thrust plate, compression plate and other plate types are also selected.Q345 Model material to be welded to the hydraulic pump cylinder blockSilicon-manganese material treatment ensures the working strength of the pulling plate device. Reasonable material selection for the pulling device can greatly enhance the service life of the components of the pulling device and reduce the maintenance cost of the plate and frame filter press equipment. At the same time, it avoids the influence on the working efficiency of the plate and frame filter press caused by the failure of the pulling plate device, and improves the working efficiency of the plate and frame filter press..

4.2 Plate and frame filter press in the installation error adjustment plate and frame filter press in the installation process due to the installation of normality will cause large errors, in the installation process, the horizontal error of the beam usually presents a 1.5mm/m The horizontal levelling error in the transverse direction as well as the longitudinal levelling error. The smaller this error is, the smoother the beam is and the less resistance the pulling device has in the working process. If the beam is placed completely horizontally, the pulling device will only be subject to horizontal friction during the working process; while the error exists and the larger the error value is, the plate frame will have a vertical force, and the friction between the plate and the plate will increase the squeezing pressure, which will play a hindering role in the work of the pulling device and accelerate the wear and tear of the components. Therefore, in the installation process of the filter press, it is necessary to carry out levelling operations on the foundation first. You can use the level meter and other geological surveys, grouting and grouting of the foundation, embedded steel processing, to enhance the bearing capacity of the foundation as well as the flatness of the foundation. After processing the foundation, the equipment is installed in accordance with the equipment installation specifications, the specific programme is shown in the figure. 4. Use the mobile crane to lift the lugs of the plate and frame filter press, and pull the whole machine to the pre-levelled foundation position. After installing in place, use the level to adjust and check the flatness of the plate and frame filter press again, and adjust it to within the specified error for the fixing of the plate and frame filter press. Install the base bolt to fix the plate and frame filter press, and keep the legs freely adjustable. Completion of the above operations will complete the installation of the plate and frame filter press and improve the working efficiency of the pulling device..

4.3 Automation of the pulling plate design of the current plate and frame filter press pulling device is not high degree of automation, the equipment often occurs during the operation of the oil failure and spring damage, equipment maintenance and parts replacement will significantly reduce the efficiency of the plate and frame filter press. Based on this phenomenon, we must carry out the automation design of the plate and frame filter press, and design the oil electronic control system and the adaptive adjustment of the pulling device. So that the pull plate device in the operation process according to the pressure required by the filter cloth to flexibly adjust the size of the pressure, to avoid excessive pressure output caused by the damage to the pull plate device and the plastic deformation of the spring. Through the adaptive adjustment of pressure can reduce the pressure output of the oil system, change the traditional plate and frame filter press in the process of mud processing, the spring of the pulling device of the height of the operation of the damage, to improve the short service life of the components of the plate and frame filter press.[4].. By designing variable frequency geared motors, sprockets, drives and PLCController and other components for the automatic control of the pulling device, composed of pulling plate drive system. The filter plates of the plate and frame filter press are divided equally, and each plate is fixed with a chain and connected by a PLC The controller is controlled to realise the high-speed operation of the pulling plate, and the speed is automatically reduced and automatically converted when the plate is taken away. In the process of pulling the plate, it realises the effect of pulling one group at a time and pulling all the filter plates in sequence, discharging the material and loosening the pressure plate after the filtration work is completed. With the above operation, the pulling device can be realised. PLC The controller control system improves the automatic operation level of the plate and frame filter press and reduces the damage to the equipment caused by improper manual operation. Adaptive adjustment of the pulling plate device is realised, and the pressure output is reasonable according to the composition of the filtrate, which reduces the damage to the pulling plate device. This operation can greatly improve the service life of the components of the pulling plate device, reduce the replacement cycle of the components, and save the maintenance cost of the plate and frame filter press equipment in coal mines..

5 Analysis of the application effect of the improved pulling plate device was carried out in the field test after completing the improvement of the pulling plate device. Through the inspection and installation of the plate and frame filter press after the practicality of the test, the test process found that the plate and frame filter press pulling device in good operating condition. The material selection of the pulling device is good and there is no damage to the parts, and the analysis and testing of the composition of the filtrate also meets the relevant specifications. Comparing with the working effect of the original plate and frame filter press, it is found that the efficiency of the plate and frame filter press has been increased by almost 20% after the horizontal installation and adjustment. 20%The failure rate of the filter plate and the puller device is greatly reduced, and the replacement cycle of the puller spring and plate components is delayed. 1 times around.

This improvement saves the coal mining company nearly $100,000 on just one plate and frame filter press. 20 The cost expenditure of 10,000 yuan, the effect is very significant. Can be carried out to improve the plate and frame filter press pulling plate device large-scale popularisation and application.6 Conclusion The Guandi Coal Processing Plant has been developed through the ZKG450/2000-U With the optimisation of plate and frame filter press pulling device, the working efficiency of plate and frame filter press has been greatly improved, and the damage rate of equipment parts has been greatly reduced. The improved plate and frame filter press has good practical effect and feasibility, which brings great economic benefits to the coal mine, and also provides a successful case demonstration for the innovation and upgrading of coal mine equipment.

Author: Han Tao

Filter press manufacturer: 18851718517

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