A vertical filter plate frame position detection and positioning device

Abstract

The utility model relates to filter press positioning technical field especially discloses a vertical filter press plate and frame position detection positioning device. The device includes filter press roof, bracket, position encoder, fixed base and control unit, the filter press roof is installed in the uppermost part of plate and frame superposition and is connected with four angle oil cylinder, the bracket is installed in the side of plate and frame and is equipped with cross arm in the top, the fixed base is installed in the filter press roof center and fixes position encoder, the steel wire rope of position encoder is connected with cross arm, and control unit is installed in the control cabinet and is electrically connected with position encoder. When working, the oil cylinder drives the filter press roof to move, and the position encoder converts the linear displacement into the electric signal through the steel wire rope traction, and the control unit compares the preset value after receiving the signal, and the oil cylinder starts and stops to realize the accurate positioning of the plate and frame. The device has high positioning accuracy and stable operation, can effectively solve the problem of insufficient accuracy of traditional positioning mode, and prolongs the service life of equipment.

Description

Technical Field

[0001] This utility model relates to the field of filter press positioning technology, and in particular to a vertical filter press plate and frame position detection and positioning device. Background Technology

[0002] Vertical filter presses, as key equipment in the field of solid-liquid separation, are widely used in industries such as chemical, mining, and environmental protection. The accuracy of the opening and closing position of the filter plates directly affects the filtration effect, production efficiency, and equipment operational safety. In existing technologies, the position detection and positioning of the filter plates in vertical filter presses are mostly achieved using limit switches, proximity switches, or photoelectric switches.

[0003] However, the above-mentioned traditional positioning methods have many shortcomings: Firstly, the positioning accuracy is low. The detection error of limit switches and proximity switches is usually 5-10mm, which is difficult to meet the requirements of high-precision filtration process for plate and frame closing gap. This can easily lead to problems such as incomplete filtration or excessive compression of the plate and frame, resulting in damage. Secondly, they have poor anti-interference capabilities. Proximity switches and photoelectric switches are easily affected by dust, humid environment and equipment vibration on site, often resulting in false triggering or signal loss, leading to uncontrolled start-up and shutdown of the equipment. Third, the lifespan is short. Limit switches are triggered by mechanical contact, and the contacts are prone to wear after long-term use. The average lifespan is less than 1 year, requiring frequent replacement and maintenance, which increases the equipment operation and maintenance costs. Fourth, it has poor adaptability. The detection stroke of traditional positioning devices is fixed, making it difficult to adjust flexibly according to different plate and frame numbers or filtration process requirements, resulting in poor versatility.

[0004] Based on the shortcomings of the existing technology, there is an urgent need for a vertical filter press plate and frame position detection and positioning device with high positioning accuracy, strong anti-interference ability, long service life and good adaptability. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a vertical filter press plate and frame position detection and positioning device, which solves the technical problems of low positioning accuracy, poor anti-interference ability, short service life and poor adaptability of traditional vertical filter press plate and frame position detection and positioning methods.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A vertical filter press plate and frame position detection and positioning device includes a filter press top plate, a bracket, a position encoder, a fixed base and a control unit; The filter press top plate is installed on the top of multiple stacked plate frames and is fixedly connected to the four corner cylinders. The cylinders work together to open and close the plate frames. Two M18 screw holes are opened in the center of the filter press top plate and the inside is tapped. The bracket includes a crossbeam, a bracket support point, a first vertical rod, a second vertical rod, and a fixing screw. The bracket is made of high-strength steel or engineering plastic and is installed on both sides of the plate frame. The bracket support point is screwed to the bottom base of the filter press by four screws. The bottom of the first vertical rod and the second vertical rod are connected to the bracket support point, and the top is screwed to the crossbeam. The crossbeam is horizontally across the top plate of the filter press and perpendicular to it. A hole is opened in the middle of the crossbeam, and the fixing screw is located in the hole. The fixed base is installed in the center of the top plate of the filter press and has a [-shaped structure. The bottom is screwed to the M18 screw hole of the top plate of the filter press through the bottom plate fixing screw one and the bottom plate fixing screw two. The top is fixed with the position encoder through the encoder fixing screw one and the encoder fixing screw two. The position encoder includes an encoder tension end, a steel wire rope, and a signal transmission line. The encoder tension end is sleeved with a fixing screw. One end of the steel wire rope is connected to the encoder tension end, and the other end is located inside the position encoder. One end of the signal transmission line is connected to the position encoder plug, and the other end is connected to the control unit terminal. The control unit includes a signal recognition device and a control device, which are installed inside the control cabinet and are used to power the position encoder and receive the signals it sends.

[0007] Preferably, the top plate of the filter press is made of stainless steel, and an alloy layer is inlaid at the lower part where it contacts the material; the bracket is made of high-strength stainless steel, the diameter of the opening in the middle of the crossbeam is 26mm, and the fixing screw installed in the hole is made of stainless steel.

[0008] Preferably, the fixed base is made of stainless steel, with two M18 holes at the bottom and two M6 round holes at the top. The base plate fixing screw one and base plate fixing screw two are M18, and the encoder fixing screw one and encoder fixing screw two are M6. All of the above screws are made of stainless steel.

[0009] Preferably, the position encoder is a precision measuring device that converts linear displacement into electrical signals. Its working principle combines mechanical transmission and sensor technology. When the object being measured moves, the wire rope pulls the threaded hub to rotate. The rotation angle is proportional to the linear displacement. After the signal is processed by the decoding circuit, it can output incremental (ABZ phase pulse) or absolute (digital encoding) signals.

[0010] Preferably, the signal identification device and the control device of the control unit are both located in the field control box, and the signal identification device is terminated with the signal transmission line of the position encoder.

[0011] Preferably, the signal recognition device uses an analog module to receive the field signal sent by the position encoder.

[0012] Preferably, the control device is a PLC control system and its output control part, which is used to receive signals from the signal identification device and compare them with the set data to control the opening or closing of the control panel.

[0013] Preferably, the encoder extension end of the position encoder is circular and equipped with a plastic buckle on the outside; the steel wire rope is made of stainless steel and has a length of 2000mm; the signal transmission line is a 5-core shielded wire.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Using a pull-wire position encoder as the core detection component, linear displacement can be converted into a high-precision electrical signal, which is far superior to the detection accuracy of traditional limit switches or proximity switches. It can accurately control the opening and closing position of the plate frame, effectively avoid the problems of incomplete filtration or excessive compression of the plate frame, and improve the stability of the filtration process.

[0015] The position encoder achieves displacement detection through mechanical traction of steel wire rope, which is unaffected by dust and humid environments on site. Combined with 5-core shielded wire for signal transmission, it can effectively isolate electromagnetic interference and achieve a high signal transmission success rate. The control unit adopts a combination structure of PLC and analog module, which has mature signal processing and logic control capabilities, enabling real-time monitoring and precise control of the board frame position, reducing the occurrence of equipment start-ups and shutdowns.

[0016] The length of the steel wire rope of the position encoder can be flexibly selected according to the maximum opening and closing stroke of the plate and frame. The bracket structure can be adapted to filter presses of different specifications by adjusting the height of the vertical rod. The PLC program of the control unit supports the modification of the positioning threshold through the touch screen, which can quickly adapt to the needs of different plate and frame numbers or filtration processes without modifying the device structure, thus improving the versatility of the device.

[0017] The control unit integrates a touch screen human-machine interface, which can intuitively display the real-time position of the board frame, positioning threshold and equipment operating status. Operators can complete parameter setting and equipment monitoring without professional skills. When the device has a fault such as position deviation, it can automatically trigger an alarm and display fault information, which facilitates quick troubleshooting and reduces the difficulty of operation. Attached Figure Description

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0019] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a structural diagram of the fixed base in this utility model.

[0020] Legend: 1. Filter press top plate; 2. Bracket; 3. Position encoder; 4. Fixed base; 5. Control unit; 11. Hydraulic cylinder; 21. Crossbeam; 22. Bracket support point; 23. Vertical rod one; 24. Vertical rod two; 25. Fixing screw; 31. Encoder tension end; 32. Steel wire rope; 33. Signal transmission line; 41. Base plate fixing screw one; 42. Base plate fixing screw two; 43. Encoder fixing screw one; 44. Encoder fixing screw two; 51. Signal recognition device; 52. Control device. Detailed Implementation

[0021] This application provides a vertical filter press plate and frame position detection and positioning device, which effectively solves the technical problems of low positioning accuracy, poor anti-interference ability, short service life and poor adaptability of traditional vertical filter press plate and frame position detection and positioning methods. Example

[0022] like Figure 1 , Figure 2 As shown, the overall technical solution in this application embodiment is as follows: To address the problems existing in the prior art, this utility model provides a vertical filter press plate and frame position detection and positioning device. Its core components include a filter press top plate 1, a bracket 2, a position encoder 3, a fixed base 4, and a control unit 5. These components work together to achieve accurate detection and positioning of the plate and frame, solving the problems of insufficient positioning accuracy and poor operational stability in traditional vertical filter presses. Specifically, the filter press top plate 1 serves as the core load-bearing component and connects to the execution components; the bracket 2 provides traction support for position detection; the position encoder 3 acquires displacement signals; the fixed base 4 ensures the encoder is securely installed; and the control unit 5 performs signal processing and motion control.

[0023] The filter press top plate 1 is made of 304 stainless steel, which has good corrosion resistance and structural strength, and can adapt to the material contact environment and pressure load during filter press operation. To further improve the wear resistance of the parts in contact with the material, a 5mm thick tungsten carbide alloy layer is inlaid in the lower part of the filter press top plate 1 in the area in contact with the material, effectively extending the service life of the top plate.

[0024] The filter press top plate 1 is installed at the top of the multi-plate frame stacked structure, and its four corners are fixedly connected to the piston rod ends of the hydraulic cylinders 11 by high-strength bolts. The four hydraulic cylinders 11 are arranged in a rectangle, and the cylinder body is fixed to the filter press frame. The extension and retraction of the piston rod drives the filter press top plate 1 to move up and down, thereby realizing the opening and closing of the plate frame. At the same time, two M18 screw holes with a spacing of 100mm are pre-machined and tapped in the center of the filter press top plate 1 for connection with the fixed base 4.

[0025] The bracket 2 is an integral frame structure made of high-strength 316 stainless steel, possessing excellent resistance to deformation and corrosion, and can adapt to the humid environment of the filter press working site. The bracket 2 specifically includes a crossbeam 21, a bracket support point 22, a first vertical rod 23, a second vertical rod 24, and a fixing screw 25. The first vertical rod 23 and the second vertical rod 24 are arranged parallel to each other, and their bottoms are welded and fixed to the bracket support point 22. The tops are screwed to the crossbeam 21 through flanges.

[0026] The bracket 2 is installed on the two sides of the plate frame. The bracket support 22 is fixed to the bottom base of the filter press by four M20 expansion bolts, ensuring the overall installation of the bracket 2 is stable. The crossbeam 21 is made of rectangular steel pipe, with a length adapted to the width of the filter press. It spans horizontally above the top plate 1 of the filter press and is perpendicular to the plane of the top plate. A through hole with a diameter of 26mm is machined in the middle of the crossbeam 21. The fixing screw 25 is an M26 stainless steel screw, which passes through the through hole and is locked by double nuts, forming a traction support point connected to the position encoder 3.

[0027] The fixed base 4 is made of bent stainless steel sheet, with an overall [-shaped structure. This structure reduces material usage while ensuring support strength, resulting in a lightweight design and easy installation. The bottom of the fixed base 4 is a flat plate structure with two through holes machined to correspond to the central screw holes of the filter press top plate 1. The bottom plate fixing screw 41 and the bottom plate fixing screw 42 are M18 stainless steel bolts, which pass through the through holes and are screwed into the M18 screw holes of the filter press top plate 1. After tightening, they are locked with anti-loosening washers to prevent loosening due to vibration during operation.

[0028] The top of the fixed base 4 is also a flat plate structure, with two M6 round holes machined with a spacing of 50mm. The bottom mounting flange of the position encoder 3 has two corresponding through holes. The encoder fixing screw 1 43 and encoder fixing screw 2 44 are M6 stainless steel hex bolts, which pass through the through holes of the encoder flange and are screwed into the M6 ​​round holes on the top of the fixed base 4 to achieve a stable installation of the position encoder 3 and ensure that it maintains axial stability during the movement of the top plate.

[0029] The position encoder 3 is a draw-wire linear displacement encoder, a precision measuring device that accurately converts linear displacement into electrical signals. Its measurement accuracy can reach ±0.1mm, meeting the high-precision requirements of plate and frame positioning. The position encoder 3 specifically includes an encoder tension end 31, a steel wire rope 32, and a signal transmission line 33. The encoder tension end 31 has a circular structure, externally fitted with a plastic clip, and internally equipped with a fixing mechanism for the steel wire rope 32.

[0030] The installation of the position encoder 3 consists of two steps: fixing the main body and connecting the traction end. First, align the bottom flange of the position encoder 3 with the top of the fixed base 4, and tighten it using encoder fixing screw 43 and encoder fixing screw 44. Then, open the plastic clip of the encoder tension end 31, fit it onto the fixing screw 25 of the bracket 2, and tighten the plastic clip to achieve a snap-fit ​​fixation, ensuring that the steel wire rope 32 moves in the same direction as the top plate 1 of the filter press. The steel wire rope 32 is made of 304 stainless steel wire with a diameter of 1.5mm and a length of 2000mm, which is suitable for the maximum opening and closing stroke of the plate and frame. The signal transmission line 33 is a 5-core shielded cable. One end is connected to the signal interface of the position encoder 3 through a plug, and the other end passes through the cable tray of the filter press and is connected to the terminal of the control unit 5. The shielding layer is grounded at one end to reduce electromagnetic interference on site.

[0031] The control unit 5 is integrated into the field control box of the filter press, specifically including a signal identification device 51 and a control device 52, which are connected by internal wiring to achieve signal interaction. The signal identification device 51 uses a Siemens S7-1200 series analog input module, which has 4 analog input channels and can receive 4-20mA analog signals output by the position encoder 3, with a sampling frequency of 100Hz to ensure real-time signal acquisition.

[0032] The control unit 52 is based on a Siemens S7-1200 PLC, and consists of a relay output module and a touch screen human-machine interface to form a control system. The PLC has a pre-programmed position control program, which can realize real-time monitoring of the plate frame position, threshold judgment, and hydraulic cylinder 11 action control; the touch screen is used to display the real-time position of the plate frame, set the positioning threshold, and display fault alarm information, which is convenient for operators to debug and monitor. The power supply of the control unit 5 is provided by the main power cabinet of the filter press, which converts the power supply to 24V DC power to power the position encoder 3 and the control module through a switching power supply.

[0033] Device operation process: The working process of this vertical filter press plate and frame position detection and positioning device is divided into two stages: plate and frame closed positioning and plate and frame open positioning, as detailed below: Plate and frame closing and positioning process: The operator initiates the plate and frame closing procedure via the touchscreen on the control box. The PLC of the control device 52 outputs a control signal, driving the piston rod of the hydraulic cylinder 11 to extend synchronously, causing the top plate 1 of the filter press to move downwards and gradually closing the plates and frames. During this process, the top plate 1 of the filter press moves the position encoder 3 downwards synchronously via the fixed base 4. The encoder extension end 31 of the position encoder 3 remains stationary because it is fixed to the bracket 2, causing the wire rope 32 to be gradually pulled out from inside the encoder.

[0034] The threaded hub inside the position encoder 3 rotates as the wire rope 32 is pulled out, converting linear displacement into a rotation angle signal. After processing by the decoding circuit, this signal is converted into a 4-20mA analog signal and sent to the signal recognition device 51 via the signal transmission line 33. The signal recognition device 51 converts the analog signal into a digital signal and transmits it to the control device 52. The PLC receives this digital signal in real time and converts it into the real-time position value of the plate frame, comparing it with the closed target position value set on the touch screen. When the real-time position value reaches the target position value, the PLC immediately outputs a stop signal, controlling the hydraulic cylinder 11 to stop extending, and the plate frame completes the closed positioning.

[0035] Plate frame opening and positioning process: After the plate and frame filter press is completed, the operator starts the plate and frame opening program. The PLC of the control device 52 outputs a reverse control signal, which drives the piston rod of the hydraulic cylinder 11 to retract synchronously, causing the top plate 1 of the filter press to move upward and the plate and frame to gradually open. At this time, the position encoder 3 moves upward synchronously with the top plate 1 of the filter press, and the wire rope 32 gradually retracts under the action of the reset spring inside the encoder, causing the threaded hub to rotate in the opposite direction.

[0036] The position encoder 3 converts the linear displacement during the retraction process into an analog signal, which is transmitted to the control device 52 via the signal recognition device 51. The PLC calculates the real-time position value of the plate frame and compares it with the set target opening position value. When the real-time position value reaches the target position value, the PLC outputs a stop signal, the hydraulic cylinder stops retracting, and the plate frame completes the opening and positioning. If the position deviation exceeds the allowable range during the process, the PLC immediately triggers an alarm signal, displays fault information on the touch screen, and cuts off the hydraulic cylinder control circuit to ensure safe operation of the equipment.

[0037] The device in this embodiment uses a pull-wire position encoder 3 to achieve direct displacement detection. Compared with the traditional limit switch detection method, the positioning accuracy is improved to ±0.1mm, effectively avoiding the problem of incomplete closure or excessive compression of the plate frame. The control unit 5 adopts a mature combination of PLC and analog module, which has strong anti-interference ability, adapts to the complex environment of industrial site, and has high operational stability.

[0038] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A vertical filter press plate and frame position detection and positioning device, characterized in that, Includes filter press top plate (1), bracket (2), position encoder (3), fixed base (4) and control unit (5); Oil cylinders (11) are fixedly installed at the four corners of the top plate (1) of the filter press. Two M18 screw holes are opened in the center of the top plate (1) of the filter press and the inside is tapped. The bracket (2) includes a crossbeam (21), a bracket support (22), a first vertical rod (23), a second vertical rod (24), and a fixing screw (25). The bracket support (22) is screwed to the bottom base of the filter press by four screws. The bottom of the first vertical rod (23) and the second vertical rod (24) are connected to the bracket support (22), and the top is screwed to the crossbeam (21). The crossbeam (21) is horizontally across the top plate (1) of the filter press and perpendicular to it. The crossbeam (21) has a hole in the middle, and the fixing screw (25) is installed in the hole. The position encoder (3) includes an encoder tension end (31), a wire rope (32) and a signal transmission line (33). The encoder tension end (31) is sleeved with a fixing screw (25). One end of the wire rope (32) is connected to the encoder tension end (31), and the other end is located inside the position encoder (3).

2. The vertical filter press plate and frame position detection and positioning device according to claim 1, characterized in that, The fixed base (4) is installed in the center of the top plate (1) of the filter press, and has a [-shaped structure. The bottom is screwed to the M18 screw hole of the top plate (1) of the filter press by the bottom plate fixing screw one (41) and the bottom plate fixing screw two (42). The top is fixed with the position encoder (3) by the encoder fixing screw one (43) and the encoder fixing screw two (44).

3. The vertical filter press plate and frame position detection and positioning device according to claim 2, characterized in that, The control unit (5) includes a signal recognition device (51) and a control device (52), which are installed inside the control cabinet.

4. The vertical filter press plate and frame position detection and positioning device according to claim 3, characterized in that, One end of the signal transmission line (33) is connected to the position encoder (3) plug, and the other end is connected to the control unit (5) terminal block.

5. The vertical filter press plate and frame position detection and positioning device according to claim 4, characterized in that, The signal identification device (51) and control device (52) of the control unit (5) are both located in the field control box, and the signal identification device (51) is terminated with the signal transmission line (33) of the position encoder (3).

6. The vertical filter press plate and frame position detection and positioning device according to claim 5, characterized in that, The signal recognition device (51) uses an analog module to receive the field signal sent by the position encoder (3).

7. The vertical filter press plate and frame position detection and positioning device according to claim 6, characterized in that, The control device (52) is a PLC control system and its output control part. It receives the signal from the signal identification device (51) and compares it with the set data to control the opening or closing of the control panel frame.

8. The vertical filter press plate and frame position detection and positioning device according to claim 7, characterized in that, The encoder extension end (31) of the position encoder (3) is circular and is fitted with a plastic buckle on the outside. The signal transmission line (33) is a 5-core shielded wire.

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