Cross-operation mode and automatic control device for plate pressing and plate pulling process of filter press

Abstract

The invention discloses a cross-operation mode and automatic control device for the pressing and pulling processes of a filter press; the cross-operation mode is a cross-operation mode for the closing of the pulling of the filter plates in the previous cycle of the filter press and the beginning of the pressing of the filter plates in the next cycle - when all the filter plates are pulled open, the pulling trolley is reset, that is, it returns to the original position at the end of the machine; when the pulling trolley starts to reset, the filter plate pressing mechanism starts to work immediately, and its hydraulic oil cylinder presses the filter plates to form a filtering mechanism, which can shorten the interval time of waiting for the pulling trolley to reset. The automatic control device is a PLC intelligent control device used in the cross-operation mode of the pressing and pulling processes, including a PLC program control cabinet, an induction switch, and a travel stop plate; the induction switch is simultaneously associated with the filter plate pulling mechanism and the filter plate pressing mechanism - when the pulling trolley starts to reset, it approaches the induction switch, and the induction switch sends a start signal of the filter plate pressing mechanism, thereby realizing the cross-operation of the closing of the pulling and pressing of the filter press, and accelerating the operation cycle.

Description

1. Technical Field

[0001] The invention belongs to the technical field of filter presses for solid-liquid separation, and relates to a cyclic cross-operation mode and an automatic control device of a high-efficiency full-automatic filter press. 2 Background technology

[0002] 2.1 A filter press is a pressurized filtration device with multiple filter chambers that operates intermittently; a fully automatic filter press is a filter press that integrates machinery, electricity, and fluids and can automatically complete the entire operation process. Its single operation cycle (from pressing the filter plate, feeding, pressing, washing, blowing, back-blowing, and pulling the plate to unload the cake) can be completed automatically with one button; a high-efficiency automatic filter press is an automatic filter press that can shorten the intermittent time, speed up the operation cycle, and improve production efficiency; it is suitable for solid-liquid separation of various suspensions. The automatic filter press is mainly composed of a frame and a clamping mechanism, a filtering mechanism, an automatic filter plate pulling mechanism (commonly known as a plate pulling trolley), a hydraulic drive mechanism, an electrical control system, and other parts. Shortening the intermittent time, speeding up the operation cycle, and improving production efficiency are the development trends of high-efficiency filter presses.

[0003] 2.2 The main process that affects the intermittent time of the filter press is the head and tail operation process (pressing the filter plate and pulling the filter plate apart). The existing single-cycle and double-cycle operation processes do not cross each other. Pressing the filter plate is achieved by pushing the push plate by the hydraulic drive mechanism, and pulling the filter plate apart is achieved by the filter plate pulling mechanism; the head and tail working process is: when the material is pressed and needs to be unloaded, the plate pulling trolley automatically moves forward, backward, and pauses on the guide rail to pull the filter plate apart, and the filter cake automatically falls off by gravity; until the automatic plate pulling is completed, the plate pulling trolley encounters resistance at the end of the guide rail (the end of the thrust plate) and automatically returns to the original position of the beginning of the guide rail (the end of the push plate when the trolley returns to its position); after the plate pulling trolley returns to its position, the hydraulic drive mechanism automatically presses the filter plate covered with the filter cloth by pushing the push plate to form a filtering mechanism.

[0004] 2.3 The existing filter plate pressing and plate pulling operation processes have the following shortcomings: the filter plate pressing and plate pulling operation processes cannot be crossed, and the filter press can start the next cycle operation (pressing the filter plate, etc.) only after the automatic plate pulling is completed and the plate pulling trolley returns to its original position. Each cycle wastes several minutes waiting for the trolley to return to its original position, affecting the production efficiency of the filter press. 3. Summary of the invention

[0005] 3.1 The purpose of the present invention is to overcome the deficiency of the existing automatic filter press that the front and rear operation processes cannot be crossed, solve the corresponding technical problems, and provide a front and rear cross-operation method and automatic control device for the pressing and pulling processes of the filter press.

[0006] 3.2 The technical solution adopted by the present invention to solve the problems of the prior art is: an automatic control device for the cross-operation of the pressing and pulling processes of the filter press (hereinafter referred to as: cross-operation control device), the overall feature of which is that an innovative operating procedure is adopted, and an induction switch is added at the end of the guide rail of the plate pulling trolley, and is connected to the PLC program control cabinet; when the automatic plate pulling is completed, the plate pulling trolley approaches the induction switch at the end of the guide rail, and the filter press immediately starts the next cycle operation, that is, the induction switch enables the program control to automatically start the filter plate pressing operation; when the plate pulling trolley stops when it hits the travel stop plate at the end of the guide rail, the plate pulling trolley motor senses resistance and automatically reverses and returns to its original position; thereby, the filter plate pressing and the plate pulling trolley returning to their original positions are cross-operated, thereby shortening the interval time of waiting for the trolley to return to its original position, and effectively speeding up the operation cycle.

[0007] 3.3 Furthermore, the additional induction switch has an additional structural feature, which is a NBN12-18GM50-E2 proximity switch, which is a switch-type sensor that automatically operates when the pull-plate trolley approaches, is easy to install and has reliable performance.

[0008] 3.4 The present invention also provides a cross-operation mode of the filter press plate pressing and plate pulling processes, that is, the end of the filter plate pulling process of the previous cycle of the filter press and the start of the filter plate pressing process of the next cycle of the filter press: it is characterized in that the filter plate pressing and the plate pulling trolley return to their original positions are efficiently cross-operated, and a single operation cycle (from pressing the filter plate, feeding, pressing, washing, drying, backblowing, plate pulling and cake unloading) is automatically completed with one button through the intelligent control of PLC + touch screen; more detailed whole process The following are: (1) Filter plate pressing: The hydraulic drive mechanism automatically presses the filter plate covered with the filter cloth by pushing the push plate, so that the filter plate is pressed to form a multi-chamber filter mechanism; (2) Pump feeding and filtration: The feed pump transports the solid-liquid mixture to each filter mechanism for low-pressure static filtration; (3) Squeezing and dehydration: When squeezing is required, high-pressure fluid or gas medium is introduced through the high-pressure medium hole to squeeze the filter cake for the second time; (4) Washing and purification: When washing is required, the water pump will wash the filter cake. The washing liquid is cross-injected into the filter cake from the washing hole for washing; (5) Blow-drying purification: When blow-drying is required, compressed air is introduced through the high-pressure medium hole, and the air flows through to blow dry the remaining washing liquid in the gaps between the filter cake particles; (6) Back-blowing materials: When back-blowing is required, high-pressure gas back-blows the residual materials remaining in the feed channels of each filter plate and blows them back to the stirring place for the next feeding; (7) Pulling the plate to unload the cake: Turn off the feed pump, and pull the filter plate open through the filter plate automatic pulling mechanism to achieve gravity cake unloading; when the automatic pulling of the plate is completed, the plate pulling trolley approaches the induction switch at the end of the guide rail, and the next cycle of the filter press is immediately started, that is, the induction switch enables the program control to automatically start the filter plate pressing operation; when the plate pulling trolley stops when it hits the travel stop plate at the end of the guide rail, the plate pulling trolley motor automatically senses the resistance and reverses to return to its original position; thereby, the filter plate pressing and the plate pulling trolley returning to their original position are efficiently cross-operated, thereby shortening the interval time of waiting for the trolley to return to its original position, effectively speeding up the operation cycle, and intermittent reciprocating cycle work to achieve batch solid-liquid separation.

[0009] 3.5 The filter press pressing and pulling process cross-operation mode and automatic control device provided by the present invention have the advantages of simple setting, short operation interval and fast cycle. The beneficial effect is that the cross-operation efficiency of the cycle operation process is high, which breaks through the existing technology that the operation process of the filter press cannot be crossed, and fills the gap of the double-cycle cross-operation of the filter press in my country. 4. Description of the drawings

[0010] Figure 1 It is a schematic diagram of the association between the cross-operation control device and the whole machine of the present invention.

[0011] Figure 2 It is a schematic diagram of the association between the induction switch, travel stop plate and plate pulling trolley of the cross operation control device of the present invention.

[0012] Figure 3Schematic diagram of the induction switch of the cross-operation control device of the present invention.

[0013] Figure numerals: 1-pulling trolley, 2-trolley guide rail, 3-induction switch, 4-travel stop plate, 5-thrust plate, 6-filter plate, 7-push plate, 8-hydraulic drive mechanism, 9-PLC program control cabinet. 5. Specific implementation methods

[0014] 5.1 The following describes the technical solutions in the embodiments of the filter press plate pressing and pulling process head-to-tail cross operation mode and the automatic control device in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only a part of the preferred embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, such as the same head-to-tail cross operation mode of the filter press and different settings of sensors, all belong to the protection scope of the present invention.

[0015] 5.2 Example 1

[0016] An automatic control device for the cross-operation of the plate pressing and plate pulling processes of a filter press, the overall feature of which is that an innovative operating procedure is provided, at the end of the plate pulling trolley guide rail 2, an NBN12-18GM50-E2 type induction switch 3 (switch-type sensor) is added, and is connected to a PLC program control cabinet 9, and automatically operates when the plate pulling trolley 1 approaches, with convenient installation and reliable performance; when the automatic plate pulling is completed, the plate pulling trolley 1 approaches the induction switch 3 at the end of the guide rail 2 ((end of the thrust plate 5)), and the filter press is immediately started The next cycle operation starts, that is, the induction switch 3 enables the program control to automatically start the filter plate 6 pressing operation; when the plate pulling trolley 1 stops at the end of the guide rail 2 when it hits the travel stop plate 4, the plate pulling trolley 1 motor senses the resistance and automatically reverses to return to its original position; thereby, the filter plate 6 pressing and the plate pulling trolley 1 returning to their original positions are efficiently cross-operated, thereby shortening the interval time of waiting for the trolley 1 to return to its original position, effectively speeding up the operation cycle, breaking through the existing technology that the operation process of the filter press cannot be cross-operated, and filling the gap of cross-operation of filter presses in my country.

[0017] 5.3 Example 2

[0018] A filter press plate pressing and plate pulling process cross-operation mode, that is, the end of the filter plate pulling of the previous cycle of the filter press and the start of the filter plate pressing process of the next cycle of the filter press cross-operation mode: its overall feature is that the filter plate 6 pressing and the plate pulling trolley 1 return to the beginning and end of the operation process efficient cross-operation, through PLC + touch screen intelligent control, a single operation cycle (from pressing the filter plate, feeding, pressing, washing, drying, back-blowing, plate pulling and cake unloading) is automatically completed with one button; the more detailed whole process is: (1) filter plate pressing: cross-operation with the plate pulling trolley 1 return to the position, the hydraulic drive mechanism 8 automatically Dynamically press the filter plate 6 covered with the filter cloth to form a multi-chamber filter mechanism; (2) Pump feeding and filtering: The feed pump transports the solid-liquid mixture to each filter mechanism for low-pressure static filtration. The filter cloth intercepts the particles in the material to form a filter cake, and the filtrate passes through the filter cloth and flows out from the liquid outlet; (3) Squeeze and dehydrate: When squeezing is required, a high-pressure fluid or gas medium is introduced through the high-pressure medium hole to cause the diaphragm to squeeze the filter cake for the second time, so that the moisture content of the filter cake is reduced to the lowest point, thereby improving the purity of the filter cake and the recovery rate of the filtrate; (4) Washing and purification: When washing is required, the water pump injects the washing liquid from the washing hole crosswise. The filter cake is washed to remove soluble impurities in the filter cake or to recover valuable mother liquor retained in the filter cake; (5) Blow-drying purification: When drying is required, compressed air is introduced through the high-pressure medium hole, and the air flows through to dry the remaining washing liquid in the gaps between the filter cake particles, so that the moisture content of the filter cake is reduced to the lowest point, thereby improving the purity of the filter cake and the recovery rate of the mother liquor, and realizing the regeneration of the water-free filter cloth; (6) Backflush material: When backflush is required, high-pressure gas backflushes the residual material remaining in the feed channel of each filter plate and blows it back to the stirring place for the next feeding; (7) Pull plate unloading cake: Turn off the feed pump and use the pull plate trolley 1 Pull open the filter plate 6 to realize gravity cake unloading; when the automatic plate pulling is completed, the plate pulling trolley 1 approaches the sensing switch 3 at the end of the guide rail, and the next cycle of the filter press starts immediately, that is, the sensing switch 3 enables the program control to automatically start the filter plate pressing operation; when the plate pulling trolley 1 hits the travel stop plate 4 at the end of the guide rail 2, it pauses, and the motor of the plate pulling trolley 1 automatically senses the resistance and reverses to return to its original position; thereby, the filter plate 6 pressing and the plate pulling trolley 1 returning to their original position are efficiently cross-operated, thereby shortening the interval time of waiting for the trolley 1 to return to its original position, effectively speeding up the operation cycle, and realizing batch solid-liquid separation through intermittent reciprocating cycle work.

Claims

1. A filter press plate pressing and plate pulling process cross-operation mode, that is, the end of the filter plate pulling of the previous cycle of the filter press and the beginning of the filter plate pressing of the next cycle of the filter press cross-operation mode: characterized in that, Under the control of the PLC system, the first step: pressing the filter plate: the filter plate pressing starts and the filter plate pulling ends in the previous cycle. The hydraulic drive mechanism automatically presses the filter plate covered with the filter cloth by pushing the push plate, so that the filter plate is pressed to form a multi-chamber filter mechanism; the second step: start the pump to feed and static filtration: the feed pump transports the solid-liquid mixture to each filter mechanism for low-pressure static filtration; The third step: dehydration by pressing: dehydration by pressing, washing and purification, and back-blowing of materials are performed according to the needs; the fourth step: unloading cakes by pulling the plate: turn off the feed pump, pull the filter plate apart through the filter plate automatic pulling mechanism, and realize gravity cake unloading; the end of pulling the filter plate apart and the beginning of the next cycle of pressing the filter plate are cross-operated. When the automatic pulling of the plate is completed, the plate pulling trolley approaches the induction switch at the end of the guide rail, and the filter press immediately starts the next cycle operation, that is, the induction switch enables the program control to automatically start the filter plate pressing operation; when the plate pulling trolley hits the travel stop plate at the end of the guide rail, it stops, and the plate pulling trolley motor senses the resistance and automatically reverses and returns to its original position; the filter plate pulling mechanism and the filter plate pressing mechanism Such reciprocating cycle and cross-cooperative operation can realize batch solid-liquid separation; the automatic control device used in the cross-operation mode of the pressing plate and pulling plate process of the filter press includes a PLC programmable control cabinet, a sensor switch, and a travel stop plate; the PLC programmable control cabinet is a PLC+touch screen intelligent control system; the sensor switch, that is, the sensor switch for the plate pulling trolley to start resetting, is a NBN12-18GM50-E2 proximity switch, which is installed at the end of the plate pulling trolley guide rail at the head of the machine, corresponds to the plate pulling trolley, and is connected to the PLC programmable control cabinet; the travel stop plate is a travel stop plate for the plate pulling trolley, which is installed at the end of the plate pulling trolley guide rail at the head of the machine.

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