Semi-automatic replacement device and replacement method for filter cloth of wet-process phosphoric acid filter

Abstract

The invention provides a semi-automatic replacement device and method for filter cloth of a wet-process phosphoric acid filter, the device comprises a truss, the bottom of the truss is provided with a straight-edge guide rail and an arc-edge guide rail, the straight-edge guide rail and the arc-edge guide rail are both connected with a pneumatic rolling assembly, and a rolling wheel of the pneumatic rolling assembly is connected with a straight-edge guide groove or an arc-edge guide groove. The arc-edge guide groove is located below the arc-edge guide rail, the straight-edge guide groove is located below the straight-edge guide rail, and the straight-edge guide groove and the arc-edge guide groove are connected with the truss through guide groove fixing pieces. In the whole process, close combination of manual work and semi-automatic equipment is achieved, seamless connection of manual laying and equipment operation is achieved, the labor intensity of manual work is remarkably reduced, the replacement efficiency is improved, and the safety and accuracy of operation are greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of wet-process phosphoric acid production automation, and relates to a semi-automatic device and a replacement method for filter cloth of a rotary filter. Background Art

[0002] Wet-process phosphoric acid production is a key process in the phosphorus chemical industry. Its core process includes acid-ore reaction, phosphogypsum filtration and washing, dilute acid concentration and other steps. Among these processes, the filtration process is particularly critical because it is directly related to the yield of phosphoric acid products and the smooth progress of subsequent processes. Wet-process phosphoric acid filtration usually uses a rotary filter for solid-liquid separation, and the filter cloth of the filter is used as a filter medium to block solid impurities and ensure smooth filtrate. However, during the phosphoric acid production process, the filter cloth of the filter will gradually lose its effectiveness after 10-15 days of use and needs to be replaced regularly.

[0003] At present, the replacement of filter cloth in wet phosphoric acid production still relies entirely on manual operation. Specifically, operators need to manually remove the old filter cloth, clean the filter plate groove, lay the new filter cloth, and then fix it with a pressure strip. This series of operation steps is cumbersome and time-consuming. It usually takes 10 operators to work continuously for 6 hours to complete the replacement of the filter cloth of a set of filters.

[0004] This manual operation method has the following significant problems: High labor intensity: During the process of replacing the filter cloth, the operator needs to maintain high-intensity physical labor for a long time, especially working in a high temperature and corrosive environment, which can easily cause fatigue and increase the burden on the body.

[0005] Long time: The manual process of replacing the filter cloth is lengthy and inefficient, which increases the downtime of the filter machine and directly affects the production efficiency of wet-process phosphoric acid and the economic benefits of the factory.

[0006] Safety hazards: Since filter cloth replacement is mostly carried out in harsh environments with high temperature and high acidity, manual operation can easily lead to accidental injuries, such as chemical burns, mechanical damage, etc. At the same time, operator fatigue also increases the risk of safety accidents.

[0007] High staff requirements: Traditional filter cloth replacement requires a lot of manpower, usually 10 operators are required to work together for one replacement. This not only increases the labor cost of the enterprise, but also increases the complexity of communication and coordination due to the collaboration of multiple people.

[0008] Therefore, the existing technology has great deficiencies in terms of labor intensity, time efficiency, safety and labor cost of filter cloth replacement. As the requirements of modern industry for production efficiency and safety are increasing, a filter cloth replacement system that can reduce labor intensity, improve replacement efficiency and ensure operational safety is urgently needed to solve these problems. This is exactly the core technical problem to be solved by the present invention. Summary of the invention

[0009] The present invention aims to provide a device for semi-automatically replacing filter cloth, so as to reduce the intensity of manual operation, shorten the replacement time, improve production efficiency, and enhance safety.

[0010] The technical solution of the present invention is as follows: A semi-automatic replacement device for filter cloth of a wet phosphoric acid filter comprises a truss. A straight-side guide rail and an arc-side guide rail are arranged at the bottom of the truss. The straight-side guide rail and the arc-side guide rail are both connected to a pneumatic rolling assembly. The rolling wheel of the pneumatic rolling assembly is connected to the straight-side guide groove or the arc-side guide groove.

[0011] The arc-edge guide groove is located below the arc-edge guide rail, and the straight-edge guide groove is located below the straight-edge guide rail. The straight-edge guide groove and the arc-edge guide groove are connected to the truss through guide groove fixing pieces.

[0012] The truss is connected to the hydraulic lifting column.

[0013] An alignment fine-tuning component is provided at the position where the truss is connected to the hydraulic lifting column.

[0014] There is one straight edge guide rail and two pneumatic rolling components are provided; there is one straight edge guide groove.

[0015] There are two arc-edge guide rails, each of which is provided with a pneumatic rolling assembly; there are two arc-edge guide grooves.

[0016] The pneumatic rolling assembly comprises a pneumatic device and a rolling wheel.

[0017] The hydraulic lifting column is made of high-strength steel.

[0018] The straight-edge guide groove and the arc-edge guide groove are made of wear-resistant material.

[0019] The straight-edge guide rail and the arc-edge guide rail are made of aluminum alloy or steel.

[0020] The guide groove fixing member includes a clamp 1 and a clamp 2; the upper parts of the clamp 1 and the clamp 2 are fixed to the truss by bolts, and the lower parts are connected to the straight-edge guide groove or the arc-edge guide groove, and the straight-edge guide groove or the arc-edge guide groove is clamped and fixed by the clamp 1 and the clamp 2; the guide groove fixing member is detachable.

[0021] The present invention also provides a semi-automatic replacement method for filter cloth of a wet-process phosphoric acid filter, using the semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter, comprising the following steps: S1. Laying filter cloth: Lay the new filter cloth on the filter plate, place one end in the straight-edge guide groove, and spread the filter cloth along the guide groove to make it flat; S2. Alignment fine-tuning: adjust the truss to the area to be laid, and adjust the alignment fine-tuning parts to make the edge of the filter cloth accurately align with the groove of the filter disc; S3. Rubber strip and pressing: Place the rubber strip in the straight edge guide groove and the arc edge guide groove, and the pneumatic rolling assembly presses the rubber strip along the straight edge guide groove and the arc edge guide groove; S4. Adjust the truss height and repeat S1 to S4 to replace the next filter cloth until the filter cloth covers the entire filter plate.

[0022] The main components of the present invention are introduced as follows: Hydraulic lifting column: This component is installed on both sides of the filter to support the entire filter cloth replacement device and can adjust the height of the filter cloth. A hydraulic cylinder is installed inside. Through the hydraulic system, the lifting column can flexibly raise and lower the filter cloth to ensure that the filter cloth can be stably covered on the working surface of the filter. The height adjustment function of this component allows the filter cloth to be laid in the best position, reducing the workload of manual adjustment.

[0023] Straight-edge guide rails and curved-edge guide rails: The guide rails provide precise motion tracks for the pneumatic rolling components. The guide rails are made of high-precision aluminum alloy or steel, with excellent straightness and rigidity, ensuring that the pneumatic rolling components can move smoothly and accurately along the guide rails, thereby achieving accurate positioning and compaction of the filter cloth. The design of the guide rails fully considers the shape and size of the filter, ensuring the flatness of each part of the filter cloth.

[0024] Pneumatic rolling assembly: The core actuator of this device can move linearly along the guide rail and is mainly responsible for pressing the filter cloth into the filter disc groove. This assembly uses the pressure generated by the pneumatic device to evenly press the rubber strip into the preset groove in the filter disc using the rolling wheel, thereby fixing the filter cloth. This semi-automatic operation greatly reduces the time and labor intensity of manual cloth pressing. The pneumatic device adopts an efficient cylinder structure. By controlling the air pressure, the pressure of the rolling assembly is accurately adjusted so that the filter cloth can be firmly embedded in the filter disc groove. The travel speed and pressure of the rolling assembly can be adjusted to meet the needs of different filter cloth materials and specifications.

[0025] Straight guide groove and curved guide groove: These two guide grooves are used to guide the placement of filter cloth and rubber strips respectively. The straight guide groove is used to guide the laying of filter cloth in the straight part, while the curved guide groove ensures that the filter cloth can be accurately positioned in the curved part of the filter. The design of the guide groove fully considers the tension and bending requirements of the filter cloth at different positions, ensuring the smoothness and accuracy of the filter cloth during the laying process. These guide groove structures are precision-machined with high dimensional accuracy and can adapt to filter cloths of different shapes and sizes.

[0026] Guide fixtures: These fixtures are used to stabilize straight-edge and curved guides, allowing them to remain stable when changing filter cloths. These fixtures ensure that the guides do not shift during operation, thereby ensuring the accuracy of the filter cloth laying. Guide fixtures use a combination of bolts and clamps to ensure the stability of the guides while facilitating the installation and removal of the guides. The design of the fixtures takes into account the gap between the guides and the filter disc. Through the fine-tuning mechanism, the guide position can be accurately adjusted to ensure that the guides do not move during the filter cloth laying process.

[0027] Alignment fine-tuning component: During the filter cloth laying process, the alignment fine-tuning component is used to achieve precise alignment of the filter cloth. This component is driven by a mechanical fine-tuning screw or a servo motor to achieve fine-tuning of the edge position of the filter cloth. This component can ensure that the filter cloth can accurately cover every point on the filter disc to avoid the phenomenon of filter cloth deviation or wrinkles. The fine-tuning component is easy to operate and can be remotely controlled through a remote control handle, avoiding errors caused by manual operation.

[0028] Control system: The control system includes an electric control cabinet and a remote control handle, which is the command center of the entire device. The electric control cabinet has a built-in programmable logic controller and related electrical components to receive and execute the instructions of the remote control handle to control the operation of each component. The remote control handle is held by the operator and remotely controls the hydraulic lifting column, walking pneumatic rolling components, and alignment fine-tuning components through wireless communication or wired connection. The control system has a human-machine interface (HMI), and the operator can monitor the operating status of the equipment through the touch screen, and perform parameter settings and fault diagnosis.

[0029] Therefore, the present invention has the following beneficial effects: The entire process of filter cloth replacement in this device is controlled by the remote control handle and the electric control cabinet. The operator issues instructions through the remote control handle to control the operation of the rolling assembly, hydraulic lifting column and alignment fine-tuning components, and monitors the entire operation process through the electric control cabinet. The control system simplifies the operation steps and reduces the possibility of human error.

[0030] This device solves the problems of high labor intensity, low efficiency and poor safety of manual operation in the prior art, and can achieve efficient and safe filter cloth replacement with less manpower. The whole process realizes the close combination of manual and semi-automatic equipment, and the manual laying and equipment operation are seamlessly connected, which significantly reduces the labor intensity of manual labor, improves the replacement efficiency, and greatly improves the safety and accuracy of operation. This design greatly reduces the necessity of manual intervention and improves the efficiency and safety of filter cloth replacement in the production process of wet phosphoric acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the structure of this device.

[0032] Figure 2 Schematic diagram of the bottom guide rail of the truss of this device.

[0033] Figure 3 Schematic diagram of the working of this device.

[0034] Figure 4 Figure 1 Enlarged view of area A.

[0035] Explanations in the figure: 1. Truss, 2. Straight-edge guide groove, 3. Arc-edge guide groove, 4. Pneumatic rolling assembly, 5. Guide groove fixing part, 6. Alignment fine-tuning component, 7. Hydraulic lifting column, 8. Filter plate, 11. Straight-edge guide rail, 12. Arc-edge guide rail, 41. Rolling wheel, 51. Clamp 1, 52. Clamp 2, 81. Filter plate groove. DETAILED DESCRIPTION

[0036] The embodiments of the present invention will be described in detail below with reference to examples. The following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0037] Example 1 As shown in the figure, a semi-automatic replacement device for filter cloth of a wet phosphoric acid filter includes a truss 1, and a straight-side guide rail 11 and an arc-side guide rail 12 are provided at the bottom of the truss 1. The straight-side guide rail 11 and the arc-side guide rail 12 are both connected to a pneumatic rolling assembly 4, and a rolling wheel 41 of the pneumatic rolling assembly 4 is connected to a straight-side guide groove 2 or an arc-side guide groove 3.

[0038] The arc-edge guide groove 3 is located below the arc-edge guide rail 12 , and the straight-edge guide groove 2 is located below the straight-edge guide rail 11 . The straight-edge guide groove 2 and the arc-edge guide groove 3 are connected to the truss 1 via a guide groove fixing piece 5 .

[0039] The truss 1 is connected to the hydraulic lifting column 7.

[0040] An alignment fine-tuning component 6 is provided at the position where the truss 1 is connected to the hydraulic lifting column 7 .

[0041] There is one straight-edge guide rail 11 and two pneumatic rolling assemblies 4 are provided; there is one straight-edge guide groove 2 .

[0042] There are two arc-edge guide rails 12 , each of which is provided with a pneumatic rolling assembly 4 ; there are two arc-edge guide grooves 3 .

[0043] The pneumatic rolling assembly 4 includes a pneumatic device and a rolling wheel 41 .

[0044] The hydraulic lifting column 7 is made of high-strength steel.

[0045] The straight-edge guide groove 2 and the arc-edge guide groove 3 are made of wear-resistant material.

[0046] The straight-edge guide rail 11 and the arc-edge guide rail 12 are made of aluminum alloy or steel.

[0047] The guide groove fixing member 5 includes a clamp 1 51 and a clamp 2 52; the upper parts of the clamp 1 51 and the clamp 2 52 are fixed to the truss 1 by bolts, and the lower parts are connected to the straight-side guide groove 2 or the arc-side guide groove 3, and the straight-side guide groove 2 or the arc-side guide groove 3 is clamped and fixed by the clamp 1 51 and the clamp 2 52; the guide groove fixing member 5 is detachable.

[0048] Example 2 The working process of this device is as follows: the filter disc 8 is composed of multiple semi-sector-shaped areas. When installing the filter cloth, install it one by one in semi-sector-shaped areas until the filter cloth covers the entire hollow circular filter disc. The specific steps are as follows: (1) Laying the filter cloth: First, unfold the new filter cloth and initially lay it on the filter disc 8. At this time, one end of the filter cloth is placed in the straight-edge guide groove 2, and the filter cloth is spread out and laid flat along the guide groove to ensure that the filter cloth is in close contact with the surface of the filter disc 8.

[0049] (2) Alignment and fine-tuning: After the filter cloth is laid in place, the operator adjusts the truss 1 to align it vertically with a semi-sector area of ​​the filter disc 8, and then starts the alignment and fine-tuning component 6. The operator uses the remote control handle to adjust the alignment and fine-tuning component 6 so that the edge of the filter cloth is precisely aligned with the filter disc groove 81 to eliminate any possible offset or wrinkles. This step ensures the effective coverage of the filter cloth and the sealing of the filter disc.

[0050] (3) Rubber strip placement: Next, the operator places the rubber strip used to fix the filter cloth in the straight edge guide groove 2 and the arc edge guide groove 3, and adjusts the height of the truss 1 through the hydraulic lifting column 7. The rubber strip is positioned through the guide groove and accurately covers the edge of the filter cloth, ready for the next step of the pressing operation.

[0051] (4) Pressing operation: The pneumatic rolling assembly 4 is controlled by the remote control handle to move along the guide rail on the truss 1. Driven by the pneumatic device, the rolling wheel 41 of the pneumatic rolling assembly 4 gradually presses the rubber strip into the filter disc groove 81 to complete the fixing operation of the filter cloth. The moving speed and pressure of the pneumatic rolling assembly 4 can be adjusted according to actual needs to ensure that the filter cloth and the filter disc 8 are tightly fitted. Specifically, two pneumatic rolling assemblies 4 are provided on the straight-edge guide rail 11, and the two pneumatic rolling assemblies 4 move from the middle position of the straight-edge guide rail 11 to both sides; and a pneumatic rolling assembly 4 is respectively provided on the two arc-edge guide rails 12, and the pneumatic rolling assembly 4 moves from one end of the arc-edge guide rail 12 to the other end to achieve a tight fit between the filter cloth and the filter disc 8.

[0052] (5) Replacing the filter cloth in the adjacent half-sector-shaped area: The operator controls the hydraulic lifting column 7 through the remote control handle to lift the truss 1 to an appropriate height, adjust it above the adjacent half-sector-shaped area, and repeat steps (1) to (4) until the filter cloth covers the entire filter plate (8).

[0053] (6) Replacement completion and inspection: After all the filter cloth pressing and alignment operations are completed, the operator resets the pneumatic rolling assembly 4 and lowers the hydraulic lifting column 7 to the initial position. Finally, the operator conducts a comprehensive inspection to confirm that the filter cloth is laid correctly and records various parameters during the replacement process for subsequent maintenance and analysis.

[0054] This device only needs to set up 3 guide rails and 3 guide grooves to complete the installation of the filter cloth.

[0055] The device can be fixed at both ends of the filter, and the relative position of the device and the filter disk can be adjusted by rotating the filter disk 8.

[0056] The entire replacement process is monitored in real time by the control system, and the operator can view the operating status and operating parameters of the equipment through the HMI interface of the electric control cabinet. During the operation, if any abnormality is found, the control system will automatically alarm and guide the operator to make necessary adjustments or troubleshooting.

Claims

1. A semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter, characterized in that: The invention comprises a truss (1), wherein a straight-side guide rail (11) and an arc-side guide rail (12) are provided at the bottom of the truss (1), the straight-side guide rail (11) and the arc-side guide rail (12) are both connected to a pneumatic rolling assembly (4), a rolling wheel (41) of the pneumatic rolling assembly (4) is connected to a straight-side guide groove (2) or an arc-side guide groove (3), and the straight-side guide groove (2) and the arc-side guide groove (3) are connected to the truss (1) via a guide groove fixing member (5).

2. The semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter according to claim 1, characterized in that: The arc-edge guide groove (3) is located below the arc-edge guide rail (12), and the straight-edge guide groove (2) is located below the straight-edge guide rail (11).

3. The semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter according to claim 1, characterized in that: The truss (1) is connected to a hydraulic lifting column (7).

4. The semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter according to claim 3, characterized in that: An alignment fine-tuning component (6) is provided at the junction of the truss (1) and the hydraulic lifting column (7).

5. The semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter according to claim 1, characterized in that: There is one straight-edge guide rail (11) and two pneumatic rolling assemblies (4); there is one straight-edge guide groove (2).

6. The semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter according to claim 1, characterized in that: There are two arc-edge guide rails (12), each of which is provided with a pneumatic rolling assembly (4); and there are two arc-edge guide grooves (3).

7. The semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter according to claim 1, characterized in that: The pneumatic rolling assembly (4) comprises a pneumatic device and a rolling wheel (41).

8. The semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter according to claim 1, characterized in that: The guide groove fixing member (5) comprises a clamp 1 (51) and a clamp 2 (52); the upper parts of the clamp 1 (51) and the clamp 2 (52) are fixed to the truss (1) by bolts, and the lower parts are connected to the straight-edge guide groove (2) or the arc-edge guide groove (3); the straight-edge guide groove (2) or the arc-edge guide groove (3) is clamped and fixed by the clamp 1 (51) and the clamp 2 (52); the guide groove fixing member (5) is detachable.

9. A semi-automatic replacement method for filter cloth of a wet-process phosphoric acid filter, using the semi-automatic replacement device for filter cloth of a wet-process phosphoric acid filter according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Laying the filter cloth: Lay the new filter cloth on the filter plate (8), place one end in the straight-edge guide groove (2), and spread the filter cloth along the guide groove and lay it flat; S2. Alignment fine-tuning: adjust the truss (1) to the area to be laid, adjust the alignment fine-tuning component (6) so that the edge of the filter cloth is precisely aligned with the filter disc groove (81); S3. Rubber strip and pressing: placing the rubber strip in the straight edge guide groove (2) and the arc edge guide groove (3), and the pneumatic rolling assembly (4) performs a pressing operation on the rubber strip along the straight edge guide groove (2) and the arc edge guide groove (3); S4. Repeat S1 to S4 to replace the next filter cloth until the filter cloth covers the entire filter plate (8).

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