CN221107301U - Control system of vacuum belt filter - Google Patents

Abstract

The utility model relates to a control system of a vacuum belt filter, which belongs to the technical field of control systems of filtering equipment and comprises a control unit, an execution unit, a suction filtration unit, a movable cloth washing unit, a squeezing unit, a filter cloth walking unit, a hydraulic system, a vacuum system, a rack and an instrument wind unit; the control unit is electrically connected with the execution unit, and the execution unit is electrically connected with the suction filtration unit; the execution unit is electrically connected with the movable cloth washing unit; the execution unit is electrically connected with the squeezing unit; the execution unit is electrically connected with the filter cloth walking unit; the execution unit is electrically connected with the vacuum system; the execution unit is electrically connected with the hydraulic system. The utility model has the advantages of reasonable design, high control precision and capability of meeting the requirement of lower moisture content of materials.

Description

Control system of vacuum belt filter

Technical Field

The utility model relates to a control system of a vacuum belt filter, and belongs to the technical field of control systems of filtering equipment.

Background

The vacuum belt filter is a solid-liquid separation device widely applied to the fields of chemical industry, metallurgy, mine, medicine, environmental protection and the like, and has the advantages of stable and continuous operation, high production efficiency, wide application range, convenient operation, simple maintenance and the like. With the development of modern industrial technology, in order to meet the market development requirement, the vacuum belt filter is gradually advancing towards the direction of specialization, customization and multifunction; the control system matched with the vacuum belt filter can improve the automation degree of the vacuum belt filter, and is an indispensable matched control system for the current vacuum belt filter.

The related Chinese patent with publication number CN206975430U discloses a novel sulfur foam filter control system, which comprises an S7-200 PLC controller module, an S7-200 PLC expansion module, a frequency converter module, a touch screen module and a static pressure type liquid level sensor module, wherein the S7-200 PLC controller module is connected with the touch screen module and is used for realizing real-time visual monitoring of equipment; the S7-200 PLC controller module is connected with the static pressure type liquid level sensor module and is used for converting the measured pressure into an electric signal, amplifying the electric signal by the amplifying circuit and compensating the electric signal by the compensating circuit and finally inputting the electric signal by limited current.

The inventor considers that with the progress of technology, products and semi-finished products which need solid-liquid separation are more and more diversified, and the process requirements are more and more severe, and the control system obviously cannot meet the process requirements of lower moisture content and more severe washing effect.

Disclosure of utility model

The utility model provides a control system of a vacuum belt filter aiming at the defects existing in the prior art.

The technical scheme for solving the technical problems is as follows: a control system of a vacuum belt filter comprises a control unit, an execution unit, a suction filtration unit, a movable cloth washing unit, a squeezing unit, a filter cloth walking unit, a hydraulic system, a vacuum system, a frame and an instrument wind unit;

The control unit is electrically connected with the execution unit, and the execution unit is electrically connected with the suction filtration unit; the execution unit is electrically connected with the movable cloth washing unit; the execution unit is electrically connected with the squeezing unit; the execution unit is electrically connected with the filter cloth walking unit; the execution unit is electrically connected with the vacuum system; the execution unit is electrically connected with the hydraulic system.

Based on the technical scheme, the utility model can also be improved as follows:

Further, the control unit comprises a man-machine interaction system, a PLC controller, an I/O module, an intermediate relay group, a rotary encoder, a pressure sensor and an eddy current sensor group; the PLC is electrically connected with the man-machine interaction system and the I/O module; the I/O module is electrically connected with the intermediate relay group, the rotary encoder, the pressure sensor and the vortex sensor group.

Further, the execution unit comprises an electromagnetic reversing valve, an electromagnetic overflow valve, a pneumatic electromagnetic valve group, a contactor, a soft starter and a frequency converter; the control unit is electrically connected with the contactor; the control unit is electrically connected with the electromagnetic overflow valve; the control unit is electrically connected with the electromagnetic reversing valve; the control unit is electrically connected with the pneumatic electromagnetic valve group; the control unit is electrically connected with the soft starter; the control unit is electrically connected with the frequency converter.

Further, the suction filtration unit comprises a fixed disk, a liquid draining device, an isolator, a vacuum loading valve and a vacuum unloading valve.

Further, the movable cloth washing unit comprises a movable frame, a chute, a distributing device, a feeding self-control valve, a leaching device and a movable cylinder.

Further, the squeezing unit comprises a squeezing oil cylinder, a squeezing plate and a liquid collecting plate.

Further, the filter cloth walking unit comprises a driving speed reducer, a driving roller, a tensioning cylinder, a deviation correcting roller, a deviation correcting air bag, a bend roller and filter cloth.

Further, the hydraulic system comprises a hydraulic oil pump, an oil pump motor and an oil tank.

Further, the vacuum system comprises a vacuum pump body and a vacuum pump motor.

Further, the instrumented wind unit includes an air compressor.

Compared with the prior art, the utility model has the beneficial effects that:

1. The control unit is arranged and is a control core of the whole machine control system, the execution unit is electrically connected with the control unit, the control unit can control the motion state, the running time and the like of each moving part through the execution unit, receives and processes the information fed back by the detection element, outputs corresponding instructions according to the setting of a working program after logic operation or mathematical operation, ensures the orderly execution of each process step of the equipment, completes the solid-liquid separation of the equipment on materials, and can meet the process requirements of lower moisture content and harsher washing effect;

2. According to the application, the squeezing unit is arranged, so that the squeezing unit can apply high-pressure squeezing force to the material subjected to suction filtration and the vacuum pumping force is added, so that the dewatering effect of the material is more thorough. The pressing unit consists of: the squeezing cylinder, the squeezing plate and the liquid collecting plate are formed; the squeezing oil cylinder is vertically arranged at the rear of the movable frame, the cylinder body of the squeezing oil cylinder is fixedly connected to the frame, the movable end of the squeezing oil cylinder is fixedly connected with the squeezing plate horizontally arranged below the squeezing oil cylinder, the squeezing oil cylinder stretches to drive the squeezing plate to move up and down, and when the squeezing oil cylinder stretches out, the squeezing plate can be pushed to move down and generate extrusion force on the liquid collecting plate horizontally arranged below the squeezing plate; the liquid collecting plate is horizontally fixedly connected on the frame, and an interface which can be connected with a vacuum system through a liquid discharging device is arranged at the bottom of the liquid collecting plate, so that a vacuum suction filtration and high-pressure squeezing dual dehydration area can be formed at the contact part of the filter cloth and the liquid collecting plate, the water content of materials can be further reduced, and the filtering effect on the materials is ensured.

Drawings

FIG. 1 is a schematic flow chart of a control system of a vacuum belt filter according to an embodiment of the present application;

FIG. 2 is a schematic flow chart of a salient control unit in an embodiment of the present application;

FIG. 3 is a flowchart illustrating a salient execution block in an illustrative embodiment of the present application;

FIG. 4 is a schematic flow chart of a highlighting hydraulic system according to an embodiment of the present application;

FIG. 5 is a schematic flow chart of a highlighting vacuum system according to an embodiment of the present application;

FIG. 6 is a schematic view showing the structure of a filter cloth according to an embodiment of the present application;

In the figure, 1, a control unit; 2. an execution unit; 3. a suction filtration unit; 4. a moving cloth washing unit; 5. a press unit; 6. a filter cloth walking unit; 7. a hydraulic system; 8. a vacuum system; 9. a frame; 10. an instrument wind unit; 11. a man-machine interaction system; 12. a PLC controller; 13. an I/O module; 14. a rotary encoder; 15. a pressure sensor; 16. a vortex sensor group; 17. an intermediate relay group; 161. a retract sensor; 162. a forward sensor; 163. a filter cloth seam sensor; 164. a sensor that rises in place; 165. a left deviation correcting sensor; 166. a right deviation correcting sensor; 167. a loose-in-place sensor; 168. a tight in place sensor; 21. an electromagnetic reversing valve; 22. an electromagnetic spill valve; 23. pneumatic electromagnetic valve group; 24. a contactor; 25. a soft starter; 26. a frequency converter; 231. a feeding electromagnetic valve; 232. eluting an electromagnetic valve; 233. moving the electromagnetic valve; 234. a deviation rectifying electromagnetic valve; 235. tensioning an electromagnetic valve; 236. a vacuum switching solenoid valve; 31. a fixed plate; 32. a liquid discharge device; 33. an isolator; 34. a vacuum loading valve; 35. a vacuum unloading valve; 41. a moving frame; 42. a chute; 43. a distributing device; 44. a feeding self-control valve; 45. leaching an automatic control valve; 46. a rinsing device; 47. a moving cylinder; 51. a squeezing cylinder; 52. a press plate; 53. a liquid collecting plate; 61. driving a speed reducer; 62. a driving roller; 63. a tension roller; 64. a tensioning cylinder; 65. a correction roller; 66. a deviation correcting air bag; 67. a redirecting roller; 68. a filter cloth; 71. a hydraulic oil pump; 72. an oil pump motor; 73. an oil tank; 81. a vacuum pump body; 82. a vacuum pump motor; 83. a vacuum pipe.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

As shown in fig. 1, a control system of a vacuum belt filter comprises a control unit 1, an execution unit 2, a suction filtration unit 3, a movable cloth washing unit 4, a squeezing unit 5, a filter cloth walking unit 6, a hydraulic system 7, a vacuum system 8, a rack 9 and an instrument wind unit 10, wherein the control unit 1 is a control core of the whole machine control system, the control unit 1 is electrically connected with the execution unit 2, the control unit 1 can control the motion state, the running time and the like of each moving part through the execution unit 2, receives and processes the information fed back by a detection element, and outputs corresponding instructions according to a working program after logic operation or mathematical operation, thereby ensuring orderly execution of each process step of the equipment, completing solid-liquid separation of the equipment on materials, and meeting the process requirements of lower moisture content and harsher washing effect.

As shown in fig. 1 and 2, the control unit 1 includes a man-machine interaction system 11, a PLC controller 12, an I/O module 13, an intermediate relay group 17, a rotary encoder 14, a pressure sensor 15, and an eddy current sensor group 16; the PLC 12 is electrically connected with the man-machine interaction system 11 and the I/O module 13; the I/O module 13 is electrically connected with the intermediate relay group 17, the rotary encoder 14, the pressure sensor 15 and the vortex sensor group 16, where the man-machine interaction system 11 is an intermediate hub between the human and the PLC controller 12, the man-machine interaction system 11 is used for information editing and parameter setting functions of the user, the man-machine interaction system 11 is electrically connected with the PLC controller 12, and it is able to complete setting and modification of operation parameters inside the PLC controller 12 and monitoring of operation state and real-time data by an operator sending control instructions to the PLC controller 12 through its visual interface, and to perform certain logic operation and arithmetic operation.

As shown in fig. 1 and 2, the PLC controller 12 is a hub of the control unit 1, and the PLC controller 12 has a powerful logic operation function and a mathematical operation function, can collect and process real-time data, completes cyclic scan control of the loader by a clock inside, and writes the execution result into the I/O module 13. The I/O module 13 is a transmission unit of instructions and data of the PLC controller 12, and the PLC controller 12 can send the instructions and the data through the I/O module 13, and can also receive the state information and the real-time data detected by the detection element through the I/O module 13;

The intermediate relay group 17 is an intermediate transition unit for the PLC controller 12 to send instructions to the execution element and to detect status information returned by the element through the I/O module 13, and has a protective effect on the I/O module 13. The rotary encoder 14 collects the number of turns of the rotary element and feeds back to the PLC controller 12 in the form of pulse signals via the I/O module 13. The pressure sensor 15 converts the engineering pressure value detected in the system into a standard analog value and feeds the standard analog value back to the I/O module 13, and the standard analog value is converted into a digital value by the I/O module 13 and then read by the PLC 12. The vortex sensor group 16 includes a back sensor 161, a forward sensor 162, a filter cloth seam sensor 163, an up-to-position sensor 164, a left-to-right sensor 165, a right-to-right sensor 166, a down-to-position sensor 167, and a down-to-in-position sensor 168, and the vortex sensor group 16 mainly feeds back the sensed position information of the moving member to the PLC controller 12 via the I/O module 13. The PLC controller 12 adds the read pulse number or pressure value or position state to the program execution, and writes the execution result to the I/O module 13, thereby changing the output state of the I/O module 13.

As shown in fig. 1, 2 and 3, the execution unit 2 is a unit that puts the control instruction of the control unit 1 to a real position, and the execution unit 2 is electrically connected with the suction filtration unit 3, so that the suction filtration state of the suction filtration unit 3 can be changed; the execution unit 2 is electrically connected with the movable cloth washing unit 4, and can control the movement of the movable cloth washing unit 4 and the feeding and leaching states; the execution unit 2 is electrically connected with the pressing unit 5, and can change the pressing state of the pressing unit 5; the execution unit 2 is electrically connected with the filter cloth walking unit 6, and can control the filter cloth 68 to walk, tension and relaxation states of the filter cloth 68 and correct the deviation phenomenon of the filter cloth 68; the execution unit 2 is electrically connected with the vacuum system 8 and can control the start and stop of the vacuum system 8; the execution unit 2 is electrically connected with the hydraulic system 7 and can control the start and stop of the hydraulic system 7.

As shown in fig. 1, 2, 3, 4, 5 and 6, the suction filtration unit 3 is connected with the vacuum system 8, and when the suction filtration unit 3 is connected with the vacuum system 8, a vacuum suction filtration area is generated on the suction filtration unit 3, so that a vacuum suction filtration dehydration function can be completed on materials arranged on the suction filtration unit 3. The suction filtration unit 3 mainly comprises a fixed disc 31, a liquid discharge device 32, an isolator 33, a vacuum loading valve 34 and a vacuum unloading valve 35, wherein the fixed disc 31 is horizontally arranged above the front part of the frame 9, a groove structure is arranged in the middle of the fixed disc 31, inclined baffles are arranged on the left side and the right side of the fixed disc 31, a porous plate for supporting filter cloth 68 is arranged on the lower part of the fixed disc, and an interface for connecting the vacuum liquid discharge device 32 is arranged on the bottom of the fixed disc. The drain 32 is arranged on one side of the fixed disk 31 in a tank-shaped structure, the middle part is provided with a liquid collecting interface, the liquid collecting interface is connected to the bottom interface of the fixed disk 31 through a hose, the upper part is provided with an interface which is in butt joint with vacuum, the bottom is provided with a drain interface, and when the bottom interface of the fixed disk 31 is connected with vacuum through the drain 32, a vacuum suction filtration area is formed in the contact area of the filter cloth 68 and the fixed disk 31. The isolators 33 span over the fixed disk 31, two ends of the isolators are fixedly connected to the frame 9, the vacuum suction filtration area can be isolated into a plurality of independent filtration areas by arranging the isolators 33 so as to complete different process functions such as filtration, washing, drying and the like, the vacuum loading valve 34 and the vacuum unloading valve 35 are arranged on a pipeline of the vacuum system 8 connected with the liquid draining device 32, and when the vacuum loading valve 34 is opened and the vacuum unloading valve 35 is closed, the fixed disk 31 is connected with vacuum; when the vacuum loading valve 34 is closed and the vacuum unloading valve 35 is opened, the fixed disk 31 is opened to the atmosphere.

As shown in fig. 1, 2, 3, 4, 5 and 6, the movable cloth washing unit 4 is in butt joint with an on-site process pipeline to complete the functions of arranging materials in a suction filtration area, washing the materials and the like, and the movable cloth washing unit 4 comprises a movable frame 41, a chute 42, a distributor 43, a feeding self-control valve 44, a leaching self-control valve 45, a leaching device 46 and a movable cylinder 47. The movable frame 41 is horizontally arranged above the fixed disk 31 and is in sliding connection with the sliding groove 42, the sliding groove 42 is horizontally arranged on two sides of the fixed disk 31, and the fixed disk 31 is fixedly connected on the frame 9; the movable cylinder 47 is arranged above the movable frame 41, the movable end of the movable cylinder 47 is fixedly connected to the movable frame 41, and the cylinder body end of the movable cylinder 47 is hinged to the frame 9. The moving cylinder 47 pushes the moving frame 41 to reciprocate back and forth above the fixed disk 31 through the chute 42. The distributor 43 is horizontally arranged above the front part of the movable frame 41 transversely, and a feeding interface above the distributor 43 is connected with a field feeding pipeline hose through a feeding self-control valve 44; the leaching device 46 is horizontally arranged on the frame 9 transversely and sequentially arranged behind the distributor 43, and a leaching interface on the leaching device 46 is connected with a leaching pipeline hose on site through a leaching self-control valve 45; the distributing device 43 and the leaching device 46 can reciprocate along with the moving frame 41 in the independent filtering area on the fixed disk 31 to realize reciprocating cloth and reciprocating washing, thereby improving the washing effect on materials and meeting the harsh working scene of washing scenes.

As shown in fig. 1, 2, 3, 4, 5 and 6, the squeezing unit 5 can apply a high-pressure squeezing force to the filtered material, and a vacuum pumping force is added to ensure that the dewatering effect of the material is more thorough. The press unit 5 includes a press cylinder 51, a press plate 52, and a collector plate 53. The squeezing oil cylinder 51 is vertically arranged at the rear of the movable frame 41, the cylinder body of the squeezing oil cylinder 51 is fixedly connected to the frame 9, the movable end of the squeezing oil cylinder 51 is fixedly connected with the squeezing plate 52 horizontally arranged below the squeezing oil cylinder, the squeezing oil cylinder 51 stretches to drive the squeezing plate 52 to move up and down, and when the squeezing oil cylinder 51 stretches out, the squeezing plate 52 can be pushed to move down and generate extrusion force on the liquid collecting plate 53 horizontally arranged below the squeezing plate 52; the liquid collecting plate 53 is horizontally fixedly connected to the frame 9, and an interface which can be connected with the vacuum system 8 through the liquid discharging device 32 is arranged at the bottom of the liquid collecting plate, so that a vacuum suction filtration and high-pressure squeezing dual dehydration area can be formed at the contact part of the filter cloth 68 and the liquid collecting plate 53, the squeezing effect on materials can be further improved, and the water content in the materials is reduced.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the filter cloth walking unit 6 can sequentially implement the procedures of vacuum suction filtration, washing filtration, vacuum drying, squeezing dehydration, filter cake removal and the like, so as to complete the technological treatment process of the materials. The filter cloth walking unit 6 comprises a driving speed reducer 61, a driving roller 62, a tensioning roller 63, a tensioning cylinder 64, a deviation correcting roller 65, a deviation correcting air bag 66, a bend roller 67 and filter cloth 68. The driving speed reducer 61 is a power source of the filter cloth walking unit 6 and provides power for the operation of the filter cloth walking unit 6, the driving speed reducer 61 is arranged at the rear of the squeezing unit 5 and fixedly connected to one side of the frame 9, the driving speed reducer 61 is fixedly connected with the driving roller 62, the driving roller 62 is arranged at the rear of the squeezing unit 5 and is rotationally connected with the frame 9, and the driving speed reducer 61 can drive the filter cloth 68 to move through the driving roller 62. A direction-changing roller 67, a deviation correcting roller 65, a deviation correcting air bag 66, a tensioning roller 63 and a tensioning cylinder 64 are sequentially arranged below the frame 9, and the direction-changing roller 67 is transversely and horizontally arranged on the frame 9 and is in rotary connection with the frame 9; the deviation correcting roller 65 is horizontally and transversely arranged on the frame 9 and can rotate relative to the frame 9, a deviation correcting air bag 66 is arranged on one side of the deviation correcting roller 65, the deviation correcting air bag 66 is in sliding connection with the frame 9, the other side of the deviation correcting roller 65 is hinged to the frame 9, one side of the deviation correcting roller 65 and the frame 9 are driven by the deviation correcting air bag 66 to slide relatively, and the other side of the deviation correcting roller 65 and the frame 9 are rotated relatively to form a certain angle with the frame 9, so that the transverse moving direction of the filter cloth 68 is changed; the tensioning roller 63 is horizontally and transversely arranged on the frame 9 and can relatively move in parallel with the frame 9 or relatively rotate, the cylinder body of the tensioning cylinder 64 is hinged on the frame 9, the movable end of the cylinder body is connected with the shaft end of the tensioning roller 63, and the tensioning cylinder 64 stretches and contracts to drive the tensioning roller 63 to move in parallel relative to the frame 9, so that the filter cloth 68 is tensioned and loosened. The filter cloth 68 is a core component of the equipment, the solid-liquid separation effect is directly affected by the selection of the filter cloth 68, one end of the filter cloth 68 is redirected by the redirecting roller 67 and then is paved on the fixed disc 31, when reaching the squeezing unit 5, the filter cloth passes through the squeezing plate 52 and the liquid collecting plate 53, forwards bypasses the driving roller 62 and changes the direction, and sequentially passes through the unloading area, the cleaning area, the tensioning roller 63 and the deviation correcting roller 65 and then is connected with the other end to form an annular structure, so that a closed loop is formed conveniently, and continuous filtering operation on materials can be realized.

As shown in fig. 1, 2, 3, 4, 5 and 6, the hydraulic system 7 mainly provides the squeezing oil pressure to the squeezing oil cylinder 51 and controls the squeezing oil cylinder, the hydraulic system 7 is composed of a hydraulic oil pump 71, an oil pump motor 72 and an oil tank 73, and after the oil pump motor 72 is started, the hydraulic oil pump 71 is driven to operate, so that the hydraulic oil pump 71 in the oil tank 73 can be pumped in or out, and the driving of the squeezing oil cylinder 51 is facilitated. The vacuum system 8 provides vacuum negative pressure for the suction filtration unit 3, realizes the functions of vacuum suction filtration of the suction filtration unit 3 on materials, such as solid-liquid separation, and the like, and the vacuum system 8 comprises a vacuum pump body 81, a vacuum pump motor 82 and a vacuum pipeline 83, and is convenient for realizing vacuum negative pressure working conditions through the vacuum pump body 81, the vacuum pump motor 82 and the vacuum pipeline 83, thereby being convenient for carrying out vacuum suction filtration on the materials. The gauge wind unit 10 provides the proper air pressure required to operate the air control element so that the air control element operates normally, and the gauge wind unit 10 includes an air compressor that is used to provide the air pressure required to the air control element.

As shown in fig. 1, 2, 3, 4, 5 and 6, the execution unit 2 includes an electromagnetic directional valve 21, an electromagnetic overflow valve 22, a pneumatic electromagnetic valve group 23, a contactor 24, a soft starter 25 and a frequency converter 26, the pneumatic electromagnetic valve group 23 includes a feeding electromagnetic valve 231, a rinsing electromagnetic valve 232, a moving electromagnetic valve 233, a deviation correcting electromagnetic valve 234, a tensioning electromagnetic valve 235 and a vacuum switching electromagnetic valve 236, the control unit 1 is electrically connected with the contactor 24, the contactor 24 can be controlled to communicate an oil pump motor 72 with a power supply, the oil pump motor 72 is started and drives a hydraulic oil pump 71 to work, so that the hydraulic system 7 can generate hydraulic oil with pressure; the control unit 1 is electrically connected with the electromagnetic relief valve 22, and can control the output flow direction of the pressure oil generated by the hydraulic oil pump 71, when the electromagnetic relief valve 22 is electrified, the output flow direction of the pressure oil flows to the working element, and the hydraulic system 7 is in a working state; when the electromagnetic relief valve 22 is powered off, the output of the pressure oil flows back to the oil tank 73, and the hydraulic system 7 is in an unloading state; the control unit 1 is electrically connected with the electromagnetic directional valve 21, and can change the direction of an oil path of pressure oil, so as to control the working state of the squeezing oil cylinder 51; the control unit 1 is electrically connected with the pneumatic electromagnetic valve group 23, and the direction of the air path of the instrument air unit 10 acting on the pneumatic element can be controlled through the pneumatic electromagnetic valve group 23, so that the working state of the pneumatic element, such as the opening and closing of an automatic control valve, the expansion and contraction of an air cylinder, the expansion and contraction of an air bag and the like, can be controlled; the control unit 1 is electrically connected with the soft starter 25, and can control the on-off of a circuit between the soft starter 25 and the vacuum pump motor 82, so as to control the start and stop of the vacuum pump; the control unit 1 is electrically connected with the frequency converter 26, and can control the on-off of a circuit between the frequency converter 26 and the driving speed reducer 61, so as to control the start and stop of the driving speed reducer 61.

As shown in fig. 1, 2, 3, 4, 5 and 6, the retract sensor 161 and the advance sensor 162 are disposed on the same side of the moving frame 41, the distance between the retract sensor 161 and the advance sensor 162 is slightly smaller than the protruding length of the moving cylinder 47, and the moving frame 41 can trigger the retract sensor 161 when moved forward by a certain distance and can trigger the advance sensor 162 when moved backward by a certain distance. The filter cloth seam sensor 163 is arranged in front of the press unit 5 and fixedly connected to one side of the frame 9, the distance between the filter cloth seam sensor 163 and the press unit 5 is smaller than a press length, and the sensor can be triggered when the filter cloth 68 is moved to the position of the filter cloth seam sensor 163. The up-to-position sensor 164 is positioned on one side of the millboard 52 and is activated when the millboard 52 is lifted a distance greater than the maximum cake thickness. The left deviation correcting sensor 165 and the right deviation correcting sensor 166 are respectively arranged at two sides of the frame 9 and near the deviation correcting roller 65, and when the filter cloth 68 is deviated left and right, the left deviation correcting sensor 165 and the right deviation correcting sensor 166 can be respectively triggered; the loose-in-place sensor 167 and the tight-in-place sensor 168 are arranged on the same side of the frame 9, the distance between the loose-in-place sensor 167 and the tight-in-place sensor 168 is smaller than the extending length of the tensioning cylinder 64, the tight-in-place sensor 168 can be triggered when the tensioning cylinder 64 extends a certain distance, and the loose-in-place sensor 167 can be triggered when the tensioning cylinder is retracted a certain distance; the rotary encoder 14 is provided on one side of the driving roller 62, opposite to the driving speed reducer 61, and the rotary shaft of the rotary encoder 14 is fixed to the driving roller 62 so as to be capable of running at an equiangular speed with the driving roller 62.

The implementation principle of the control system of the vacuum belt filter provided by the embodiment of the application is as follows: when filtering materials, firstly, starting the control unit 1, starting the vacuum system 8, and starting the hydraulic system 7 to enable the hydraulic oil pump 71 to be in an unloading state; the instrument wind unit 10 is turned on to bring the air control element into an initial state: the vacuum unloading valve 35 is opened, the vacuum loading valve 34 is closed, the feeding self-control valve 44 is closed, the leaching self-control valve 45 is closed, the filter cloth 68 is in a loose state, and the moving frame 41 is in a retreating state; setting related operation parameters of the PLC 12 through the man-machine interaction system 11; after the setting is finished, a control signal of the man-machine interaction system 11 is started to enable the equipment to be in an automatic operation state, the movable electromagnetic valve 233 is powered on, the movable air cylinder 47 stretches out to push the movable frame 41 to move forwards, when the movable frame 41 triggers the retraction sensor 161, the movable electromagnetic valve 233 is powered off, and the movable air cylinder 47 retracts to drive the movable frame 41 to retract; when the frame triggers the forward sensor 162, the moving electromagnetic valve 233 is powered on, the moving cylinder 47 stretches out to push the moving frame 41 to move forward, so that the moving frame 41 repeatedly moves forward and backward; meanwhile, the electromagnetic overflow valve 22 is powered on, the electromagnetic directional valve 21 is powered on, the oil way is communicated to retract the pressing oil cylinder 51, the pressing plate 52 moves upwards, when the pressing plate 52 triggers the lifting in-place sensor 164, the electromagnetic overflow valve 22 is powered off, the electromagnetic directional valve 21 is powered off, the pressing oil cylinder 51 stops retracting, and the pressing plate 52 stops lifting and is kept in position; when the tensioning cylinder 64 stretches out of the tensioning filter cloth 68 and the in-place sensor 168 is triggered, the speed reducer 61 is driven to start, the filter cloth 68 is driven to move by the driving roller 62 at a set rotating speed, the rotary encoder 14 rotates, and a pulse signal starts to be generated and recorded; when the filter cloth 68 seam triggers the filter cloth seam sensor 163, the pulse value stored inside the PLC controller 12 is cleared, and the pulse value after that is re-recorded inside the PLC controller 12; simultaneously, the feeding self-control valve 44 is opened, and the distributing device 43 starts to move and distribute materials along with the reciprocating moving frame 41; when the pulse value generated by the rotary encoder 14 is converted to be equal to the length of the vacuum filtration area, the speed reducer 61 is driven to stop, the feeding self-control valve 44 is closed, and the tensioning cylinder 64 loosens the filter cloth 68; when the loose in-place sensor 167 is triggered, the vacuum switching electromagnetic valve 236 is powered on, the vacuum loading valve 34 is opened, the vacuum unloading valve 35 is closed, the fixed disc 31 is connected with vacuum, the vacuum suction filtration of the materials arranged on the fixed disc is started, and meanwhile, the leaching self-control valve 45 is opened to carry out reciprocating movement washing on the materials; when the set washing time is reached, the leaching automatic control valve 45 is closed, the moving frame 41 stops moving, and the materials are continuously dried under the vacuum effect; when the set drying time arrives, the vacuum loading valve 34 is closed, the vacuum unloading valve 35 is opened, and the fixed disk 31 is disconnected from vacuum; the set delay time is reached and the tensioning cylinder 64 tensions the filter cloth 68; when the close-in-place sensor 168 is triggered, the speed reducer 61 is driven to start, the filter cloth 68 moves forwards, the moving frame 41 starts to move, the feeding automatic control valve 44 is opened, and cloth starts to be distributed; when the pulse value generated by the rotary encoder 14 is converted to be equal to a pressing length, the speed reducer 61 is driven to stop, and the tensioning cylinder 64 relaxes the filter cloth 68; when the loose in-place sensor 167 is triggered, the vacuum switching electromagnetic valve 236 is electrified, the vacuum unloading valve 35 is closed, the vacuum loading valve 34 is opened, the fixed disc 31 is connected with vacuum, the materials arranged on the fixed disc are subjected to vacuum suction filtration, meanwhile, the squeezing cylinder 51 stretches out to push the squeezing plate 52 to move downwards, the materials after suction filtration are squeezed, and the leaching self-control valve 45 is opened to wash the materials; when the set time for feeding is reached, the feeding self-control valve 44 is automatically closed; after the set washing time is reached, the self-control valve 45 is automatically closed, and the moving frame 41 is stopped; when the pressing plate 52 contacts the material, the hydraulic system 7 can slowly increase the pressing pressure, and the pressing pressure is maintained after the set high pressure is reached; until the set time arrives, the press cylinder 51 is retracted, and the press plate 52 is moved up; when the up-to-position sensor 164 is triggered, the press cylinder 51 stops; the cycle of steps after A is repeated. The filter cloth 68 is removed when moving to the unloading position, cleaned and regenerated when moving to the cleaning position, and corrected by the deviation correcting device when the filter cloth 68 is deviated, and meanwhile, the program design that the seam of the filter cloth 68 is avoided from the squeezing unit 5 is arranged in the program, so that the condition that the seam of the filter cloth 68 is crushed is avoided.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (9)

1. A control system of a vacuum belt filter is characterized in that: the device comprises a control unit (1), an execution unit (2), a suction filtration unit (3), a movable cloth washing unit (4), a squeezing unit (5), a filter cloth walking unit (6), a hydraulic system (7), a vacuum system (8), a rack (9) and an instrument wind unit (10);

The control unit (1) is electrically connected with the execution unit (2), and the execution unit (2) is electrically connected with the suction filtration unit (3); the execution unit (2) is electrically connected with the movable cloth washing unit (4); the execution unit (2) is electrically connected with the squeezing unit (5); the execution unit (2) is electrically connected with the filter cloth walking unit (6); the execution unit (2) is electrically connected with the vacuum system (8); the execution unit (2) is electrically connected with the hydraulic system (7);

The squeezing unit (5) comprises a squeezing oil cylinder (51), a squeezing plate (52) and a liquid collecting plate (53), wherein the squeezing oil cylinder (51) is vertically arranged at the rear of the movable frame (41), a cylinder body of the squeezing oil cylinder is fixedly connected to the frame (9), the movable end of the squeezing oil cylinder (51) is fixedly connected with the squeezing plate (52) horizontally arranged below the squeezing oil cylinder, the squeezing oil cylinder (51) stretches out and draws back to drive the squeezing plate (52) to move up and down, and when the squeezing oil cylinder (51) stretches out, the squeezing oil cylinder (51) can push the squeezing plate (52) to move down and generate extrusion force on the liquid collecting plate (53) horizontally arranged below the squeezing plate (52); the liquid collecting plate (53) is horizontally fixedly connected on the frame (9), the bottom of the liquid collecting plate is provided with an interface which can be connected with the vacuum system (8) through the liquid discharging device (32), and a vacuum suction filtration and high-pressure squeezing double dehydration area can be formed at the contact part of the filter cloth (68) and the liquid collecting plate (53).

2. A control system for a vacuum belt filter as in claim 1 wherein: the control unit (1) comprises a man-machine interaction system (11), a PLC (programmable logic controller) 12, an I/O module (13), an intermediate relay group (17), a rotary encoder (14), a pressure sensor (15) and an eddy current sensor group (16); the PLC (12) is electrically connected with the man-machine interaction system (11) and the I/O module (13); the I/O module (13) is electrically connected with the intermediate relay group (17), the rotary encoder (14), the pressure sensor (15) and the vortex sensor group (16).

3. A control system for a vacuum belt filter as in claim 1 wherein: the execution unit (2) comprises an electromagnetic reversing valve (21), an electromagnetic overflow valve (22), a pneumatic electromagnetic valve group (23), a contactor (24), a soft starter (25) and a frequency converter (26); the control unit (1) is electrically connected with the contactor (24); the control unit (1) is electrically connected with the electromagnetic overflow valve (22); the control unit (1) is electrically connected with the electromagnetic reversing valve (21); the control unit (1) is electrically connected with the pneumatic electromagnetic valve group (23); the control unit (1) is electrically connected with the soft starter (25); the control unit (1) is electrically connected with the frequency converter (26).

4. A control system for a vacuum belt filter as in claim 1 wherein: the suction filtration unit (3) comprises a fixed disc (31), a liquid draining device (32), an isolator (33), a vacuum loading valve (34) and a vacuum unloading valve (35).

5. A control system for a vacuum belt filter as in claim 1 wherein: the movable cloth washing unit (4) comprises a movable frame (41), a chute (42), a distributor (43), a feeding self-control valve (44), a leaching self-control valve (45), a leaching device (46) and a movable cylinder (47).

6. A control system for a vacuum belt filter as in claim 1 wherein: the filter cloth walking unit (6) comprises a driving speed reducer (61), a driving roller (62), a tensioning roller (63), a tensioning cylinder (64), a deviation correcting roller (65), a deviation correcting air bag (66), a direction changing roller (67) and filter cloth (68).

7. A control system for a vacuum belt filter as in claim 1 wherein: the hydraulic system (7) comprises a hydraulic oil pump (71), an oil pump motor (72) and an oil tank (73).

8. A control system for a vacuum belt filter as in claim 1 wherein: the vacuum system (8) comprises a vacuum pump body (81) and a vacuum pump motor (82).

9. A control system for a vacuum belt filter as in claim 1 wherein: the instrumented wind unit (10) includes an air compressor.