A scalable filter plate

Abstract

This invention discloses a retractable filter plate, relating to the field of disc filters. It includes a connecting base, a left movable filter plate, a right movable filter plate, a central fixed filter plate, and a filter plate telescopic device. The central fixed filter plate is fixed to the connecting base. The left movable filter plate is rotatably fitted onto the left side of the central fixed filter plate, and the right movable filter plate is rotatably fitted onto the right side of the central fixed filter plate. A central screw is rotatably connected to the top of the central fixed filter plate. A locking block is provided on the outer wall of the central screw. Semi-circular locking block grooves are provided on the left and right movable filter plates at positions corresponding to the central screw. Both the left and right movable filter plates have opening holes that match the filter plate telescopic device. The opening and closing of the left and right movable filter plates relative to the central fixed filter plate is controlled by driving the filter plate telescopic device. This invention solves the problem that traditional filter plates have a large head circumference and a small bottom circumference of the filter cloth opening, making it impossible for trapezoidal filter cloths to fit the wide head of the filter plate within a narrow bottom opening.

Description

Technical Field

[0001] This invention relates to the field of disc filters, and more specifically to a retractable filter plate. Background Technology

[0002] Disc filters require filter bags to be placed on the filter plates before use, and these bags need to be replaced periodically during the filtration process. Most existing disc filters have a circular disc structure, consisting of several trapezoidal filter plates. Because the width of the head of the filter plate is greater than the width of the tail, the filter bags cannot be directly replaced on the filter plate; each filter plate must be removed from the central shaft. However, the filter plates are large and heavy, making the installation and removal process labor-intensive, time-consuming, and complex.

[0003] For example, Chinese patent document (CN113509780A) discloses a disc filter disc, which includes a plurality of sector plates, each sector plate having a front side and a back side as the opposite side surface of the front side, the front sides of each sector plate together forming the front side of the disc filter disc, the back sides of each sector plate together forming the back side of the disc filter disc, each sector plate also having an outer arc edge and an inner edge opposite to the outer arc edge, each outer arc edge together forming the outer circumference of the disc filter disc, each sector plate also having a first side and a second side connecting the outer arc edge and the inner edge; a plurality of filter bags, the front and back sides of the sector plates being covered by the filter bags; and a plurality of outer frames, the outer frames being fastened to the sector plates in a manner that clamps the filter bags. Replacing filter bags on traditional filter plates requires first removing the external guide rails, then detaching each filter plate from the filter press's central shaft, manually transporting it off-site, removing the filter bags from the plates, replacing them with new ones, and finally reinstalling the filter plates and external guide rails. Due to the large weight of the filter plates, this entire process is not only time-consuming and labor-intensive but also severely impacts production efficiency. Furthermore, traditional filter plates need to be disassembled and taken off-site for cloth replacement approximately every 45 days. This repeated disassembly significantly wears down the lifespan of the central shaft threads on the disc filter. Damaged threads require re-tapping the central shaft, which is extremely difficult due to the confined space inside the disc filter.

[0004] Chinese patent document (CN112495043A) discloses a non-disassembly filter plate for a disc filter, including a filter plate body. The filter plate body is composed of one or more sector-shaped units mounted on a central shaft. The central shaft is provided with mounting holes for mounting the sector-shaped units. When multiple sector-shaped units are provided, the multiple sector-shaped units share a flow channel, and the mounting holes on the central shaft are evenly arranged along the circumferential direction. The sector-shaped units are elongated, with the upper end set to be flat and the lower end set to be elliptical. The upper end of the sector-shaped unit is smoothly transitioned to the lower end. The thickness increases from top to bottom in the thickness direction and decreases from top to bottom in the width direction. The outer perimeter of any cross-section perpendicular to the axial direction of the sector-shaped unit is equal. This patented solution is currently used on the largest disc filter in the country. For a large disc filter, a single machine has 576 filter plates. On-site removal and replacement of a single filter plate takes about 45-60 minutes. Even with the aforementioned non-removable filter plates, replacing all the filter cloths in the entire machine would still take about 21 days, resulting in wasted production capacity. Moreover, before shutting down the disc filter, the surface of the filter cloth needs to be washed with water. After surface cleaning, workers also need to use a high-pressure water gun to clean the residual slag between the plates to facilitate the removal of traditional filter plates for on-site cloth replacement, a time-consuming process. Furthermore, due to the special design of this non-removable filter plate, only high-strength nylon cloth can be used for the filter cloth. Lower-strength polypropylene filter cloth cannot guarantee the cloth's lifespan (3-7 days), but nylon cloth is expensive, with the production cost of a single filter cloth being about 300 yuan, resulting in high production costs.

[0005] Traditional filter plates require the filter plates to be moved off-site for replacement, a process that requires five workers. Ordinary disc filter plates are too heavy (20-25 kg), and large disc filter plates can weigh as much as 160 kg. Workers expend a lot of energy carrying the filter plates, resulting in low replacement efficiency.

[0006] In order to facilitate the disassembly of filter plates, traditional filter plate designs typically use clamping blocks to fix the filter plates on the central shaft. The drawback of this method is that the filter plates have poor stability. During machine operation, the filter plates may fall off due to the loosening of the clamping blocks, causing different damage to the surrounding filter plates.

[0007] Chinese patent document (CN218357843U) discloses a retractable filter plate for a vacuum disc filter, relating to the field of disc filters. It includes a connecting base, a left movable filter plate, a right movable filter plate, a fixed plate, and an internal shrinkage device. The connecting base is mounted on the bottom of the fixed plate. The left movable filter plate is hinged to the left side of the connecting base and fitted onto the left side of the fixed plate. The right movable filter plate is hinged to the right side of the connecting base and fitted onto the right side of the fixed plate. The internal shrinkage device is located within the fixed plate, causing the left and right movable filter plates to open or close relative to the fixed plate. When the left and right movable filter plates are open relative to the fixed plate, they form an approximately trapezoidal structure; when they are closed relative to the fixed plate, they form an approximately rectangular structure. However, this technical solution relies on the internal shrinkage device to achieve the expansion and contraction of the left and right movable filter plates. During operation, the internal shrinkage device may prevent the left and right filter plates from freely expanding and contracting due to filtrate crystallization. In existing technologies, there are also alumina filter plates made in the form of corrugated plates. The disadvantage of these plates is that the inner cavity is narrow, crystallization is severe, and the inner cavity is easily blocked, resulting in a significant decrease in output. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a retractable filter plate that solves the problem of traditional filter plates having a large head circumference and a small bottom circumference of the filter cloth opening, making it impossible for the trapezoidal filter cloth to fit its narrow bottom opening onto the wide head opening of the filter plate. This eliminates the need to disassemble and transport the entire filter plate from the central shaft of the disc filter to the off-site area for cloth replacement, simplifying cloth replacement, shortening replacement time, reducing filter plate weight, and decreasing labor costs during transport, thus effectively increasing production capacity. Compared to traditional shrinkage mechanisms, this filter plate does not have an internal retractable device in its central plate; instead, the retractable device is opened and closed using external tools, avoiding the problem of the internal retractable device being unable to freely extend and retract due to filtrate crystallization during operation.

[0009] The objective of this invention is achieved through the following technical solution: This retractable filter plate includes a connecting base, a left movable filter plate, a right movable filter plate, a central fixed filter plate, and a filter plate telescopic device. The central fixed filter plate is fixed on the connecting base. The left movable filter plate is rotatably fitted on the left side of the central fixed filter plate, and the right movable filter plate is rotatably fitted on the right side of the central fixed filter plate. A central screw is rotatably connected to the top of the central fixed filter plate. A locking block is provided on the outer wall of the central screw. Semi-circular locking block grooves are provided on the left and right movable filter plates at positions corresponding to the central screw. Both the left and right movable filter plates are provided with opening holes that match the filter plate telescopic device. The opening and closing of the left and right movable filter plates relative to the central fixed filter plate is controlled by driving the filter plate telescopic device.

[0010] When the left movable filter plate and the right movable filter plate close relative to the central fixed filter plate, the three form an approximate rectangular structure, which is convenient for the installation and removal of filter cloth. At this time, the clamping block is inserted into the semi-circular clamping block groove to fasten the left movable filter plate and the right movable filter plate.

[0011] When the left movable filter plate and the right movable filter plate open relative to the central fixed filter plate, the three form an approximate trapezoidal structure to stretch the filter cloth. At the same time, a support plate is placed between the left movable filter plate and the right movable filter plate for support.

[0012] As a further technical solution, the central fixed filter plate includes a front plate and a rear plate arranged at intervals, and reinforcing rib plates are welded on both sides of the front plate and the rear plate. The top of the front plate and the rear plate is connected and fixed by a cover plate, and the bottom of the front plate and the rear plate is fixed to the connection base; a cavity of the central fixed filter plate is formed between the front plate and the rear plate, and at least one reinforcing rib plate is placed in the cavity, and the reinforcing rib plate is welded and fixed to the front plate and the rear plate respectively.

[0013] As a further technical solution, a number of filter holes are opened on the surfaces of the left movable filter plate, the right movable filter plate, the front plate, the rear plate and the reinforcing rib plate.

[0014] As a further technical solution, a lower fixing nut is fixed at the bottom of the cover plate. The central screw passes through the cover plate and is connected to the lower fixing nut, so that the clamping blocks on both sides of the central screw are located on the top of the cover plate; when the left movable filter plate and the right movable filter plate close relative to the central fixed filter plate, the upper end of the central screw extends out of the semi-circular clamping block groove.

[0015] As a further technical solution, screw kidney-shaped holes are opened on the support plate for inserting the clamping blocks, and the length of the support plate matches the maximum opening distance between the left movable filter plate and the right movable filter plate.

[0016] As a further technical solution, a clamping plate is further included. The clamping plate is in a "C" shape, and a clamping groove is opened on it. At the same time, a kidney-shaped hole is also opened in the center of the clamping plate, so that the central screw passes through the kidney-shaped hole of the clamping plate and is locked with an upper fixing nut, so as to tightly press the top end of the filter cloth sleeved on the filter plate.

[0017] As a further technical solution, the filter cloth is in a bag shape, the circumference of the lower opening of the filter cloth is slightly larger than the circumference of the top after the left movable filter plate, the right movable filter plate and the central fixed filter plate are closed, and the lower opening of the filter cloth is tied tightly by a hoop; when the left movable filter plate and the right movable filter plate are fully opened relative to the central fixed filter plate, the filter cloth is tightened.

[0018] As a further technical solution, fixing screw holes are provided on both sides of the connection base, and the connection base is connected and fixed to the fixed holes on both sides of the central shaft of the disk filter by fixing screws, so as to fix the filter plate on the central shaft of the disk filter.

[0019] As a further technical solution, the connecting base has left and right round holes at both the front and rear of its head, a centrally fixed filter plate, and round holes at the bottom of the left and right movable filter plates connected to the round holes of the connecting base by pins (screws).

[0020] As a further technical solution, the filter plate telescopic device includes a rack, a sliding seat slidably mounted on the rack, and a movable handle rotatably connected to the sliding seat. A fixed support rod is provided at one end of the rack, and a movable support rod is provided on the sliding seat, which is used to cooperate with the fixed support rod to be placed into the opening hole on the left or right movable filter plate respectively. A gear is provided in the sliding seat and driven by the movable handle. The gear meshes with the rack. When the movable handle is rotated, the gear is synchronously driven to slide along the rack, so that the movable support rod opens or closes relative to the fixed support rod.

[0021] As a further technical solution, a lifting handle is fixed to the side wall of the rack via a connecting rod, and a limiting tongue is rotatably connected inside the sliding seat to prevent the gear from engaging with the rack.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. Saves cloth replacement time: The retractable filter plate of our invented disc filter machine can be disassembled and replaced in less than 6 minutes. The time required to replace the entire filter cloth is about 2 days. Compared with the filter plate which takes 21 days to replace the cloth, the cloth replacement time is greatly shortened. The time saved in cloth replacement can be converted into production capacity, achieving an increase of about 3 times in production capacity.

[0024] 2. Avoid wear and tear on the central shaft and save manpower: Our company's invented telescopic filter plate will be permanently fixed on the central shaft without disassembly. Simply move the filter cloth (1-2 kg) to the site for cloth replacement. Only 2 people are needed for cloth replacement, saving a lot of manpower during the cloth replacement process. The filter plate will not be disassembled until the end of its life (generally 2-3 years), which will not affect the wear of the threads on the central shaft and avoid maintenance problems caused by repeated disassembly and reassembly of the filter plate. Moreover, the weight of a single filter plate is about 80 kg, which is much lower than the 160 kg of ultra-large filter plates, reducing the energy consumption of the machine during operation.

[0025] 3. Eliminates the need for high-pressure water gun rinsing: Our company's retractable filter plate eliminates the need for a high-pressure water gun to clean the slag residue in the gaps between the plates. Simply retract the left and right movable filter plates using the telescopic device, bringing them closer to the central fixed filter plate. At this point, there is enough space on both sides of the filter plate, allowing the old filter cloth to be easily pulled out and replaced with a new one.

[0026] 4. Improved safety and stability of the filter plate: The telescopic filter plate invented by our company takes into account that the filter plate is fixed on the central shaft of the disc filter for a long time. It uses anti-loosening screws and nuts to directly engage with the threads on the central shaft, which greatly increases the stability of the filter plate and makes it less likely to fall off during operation, reducing the occurrence of machine safety accidents.

[0027] 5. Production capacity is not affected by internal crystallization: The filter plate is opened and closed by an external tool telescopic device, no longer relying on an internal telescopic device to achieve opening and closing. This results in a large internal space for the filter plate, a low probability of crystallization, and production capacity is not affected by crystallization.

[0028] 6. Cost savings on filter cloth: Our company's invented stretchable filter plate is used on ultra-large filter plates. It does not require high-strength nylon cloth. Ordinary polypropylene non-woven cloth can achieve the same filtration effect. The lifespan of the cloth is about 45 days. A single filter cloth costs about 80 yuan, which is low cost. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention in its closed state.

[0030] Figure 2 This is a schematic diagram of the structure of the present invention in its open state.

[0031] Figure 3 This is a schematic diagram of the connection structure between the cover plate and the central screw in this invention.

[0032] Figure 4 This is a schematic diagram of the structure of the present invention after the support plate is installed in the open state.

[0033] Figure 5 This is a schematic diagram of the structure of the present invention after the filter cloth is installed.

[0034] Figure 6 This is a three-dimensional structural diagram of the card plate in this invention.

[0035] Figure 7 This is a bottom view of the card plate structure in this invention.

[0036] Figure 8 This is a schematic diagram of the support plate in this invention.

[0037] Figure 9 This is a schematic diagram of the structure of the central screw in this invention.

[0038] Figure 10 This is a schematic diagram of the connection structure between the front plate and the rear plate in this invention.

[0039] Figure 11 This is a schematic diagram of the connecting base in this invention.

[0040] Figure 12This is a schematic diagram of the structure of the engaging screw in this invention.

[0041] Figure 13 This is a schematic diagram of the filter plate telescopic device in this invention. Figure 1 .

[0042] Figure 14 This is a schematic diagram of the filter plate telescopic device in this invention. Figure 2 .

[0043] Figure 15 This is a schematic diagram of the structure when the left and right movable filter plates are closed using the filter plate telescopic device in this invention.

[0044] Figure 16 This is a schematic diagram of the structure when the left and right movable filter plates are opened using the filter plate telescopic device in this invention.

[0045] Figure 17 This is a cross-sectional view of the centrally fixed filter plate in this invention.

[0046] Explanation of reference numerals in the attached drawings: 1. Connecting base; 2. Left movable filter plate; 3. Right movable filter plate; 4. Center fixed filter plate; 4-1. Front plate; 4-2. Rear plate; 5. Center screw; 5-1. Clamping block; 6. Support plate; 6-1. Screw waist-shaped hole; 7. Upper fixing nut; 8. Spreading hole; 9. Semi-circular clamping block groove; 10. Reinforcing rib plate; 11. Cover plate; 12. Lower fixing nut; 13. Left round hole; 14. Right round hole; 15. Pin shaft; 16. Handling screw fixing hole; 17. Handling screw; 20. Filter plate telescopic device; 20-1. Fixed support rod; 20-2. Connecting rod; 20-3. Sliding seat; 20-4. Lifting handle; 20-5. Rack; 20-6. Gear; 20-7. Movable handle; 20-8. Limiting tongue; 20-9. Movable support rod; 21. Clamping plate; 21-1. Clamping groove; 21-2. Waist-shaped hole; 23. Filter hole; 24. Filter cloth; 25. Clamp. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings:

[0048] Example: As attached Figures 1-17As shown, this retractable filter plate includes a connecting base 1, a left movable filter plate 2, a right movable filter plate 3, a central fixed filter plate 4, a front plate 4-1, a rear plate 4-2, a central screw 5, a locking block 5-1, a support plate 6, a screw waist-shaped hole 6-1, an upper fixing nut 7, an opening hole 8, a semi-circular locking block groove 9, a reinforcing rib plate 10, a cover plate 11, a lower fixing nut 12, a left round hole 13, a right round hole 14, a pin shaft 15, a locking screw fixing hole 16, a locking screw 17, a filter plate telescopic device 20, a fixed support rod 20-1, a connecting rod 20-2, a sliding seat 20-3, a lifting handle 20-4, a rack 20-5, a gear 20-6, a movable handle 20-7, a limiting tongue 20-8, a movable support rod 20-9, a locking plate 21, a locking groove 21-1, a waist-shaped hole 21-2, a filter hole 23, a filter cloth 24, and a clamp 25.

[0049] Reference Appendix Figure 2 , 10 The central fixed filter plate 4 is fixed on the connecting base 1. The central fixed filter plate 4 includes a front plate 4-1 and a rear plate 4-2 spaced apart, and reinforcing ribs 10 are welded to both sides of the front plate 4-1 and the rear plate 4-2. The tops of the front plate 4-1 and the rear plate 4-2 are connected and fixed by a cover plate 11, and the bottoms of the front plate 4-1 and the rear plate 4-2 are fixed to the connecting base 1. Figure 17 As shown, an inner cavity for a centrally fixed filter plate 4 is formed between the front plate 4-1 and the rear plate 4-2. Two reinforcing ribs 10 are placed in the inner cavity, and the two reinforcing ribs 10 are welded and fixed to the front plate 4-1 and the rear plate 4-2 respectively. Several filter holes 23 are formed on the surfaces of the left movable filter plate 2, the right movable filter plate 3, the front plate 4-1, the rear plate 4-2, and the reinforcing ribs 10.

[0050] like Figure 2 , 4 As shown, a left circular hole 13 is opened on the left side of the central fixed filter plate 4, and a corresponding left circular hole 13 is opened on the left movable filter plate 2. A left circular hole 13 is also opened on the left side of the connecting base 1. The left movable filter plate 2 is rotatably fitted onto the left side of the central fixed filter plate 4, and a pin 15 is installed inside the left circular hole 13 for connection. A right circular hole 14 is opened on the right side of the central fixed filter plate 4, and a corresponding right circular hole 14 is opened on the right movable filter plate 3. A right circular hole 14 is also opened on the right side of the connecting base 1. The right movable filter plate 3 is rotatably fitted onto the right side of the central fixed filter plate 4, and a pin 15 is installed inside the right circular hole 14 for connection. Figure 2 , 3As shown in the figure, a central screw 5 is rotatably connected to the top of the central fixed filter plate 4. Clamping blocks 5-1 are welded to both sides of the outer wall of the central screw 5. Semi-circular clamping block grooves 9 are provided at positions corresponding to the central screw 5 on the left movable filter plate 2 and the right movable filter plate 3. At the same time, support holes 8 matching the filter plate expansion device 20 are provided on both the left movable filter plate 2 and the right movable filter plate 3. The opening and closing movement of the left movable filter plate 2 and the right movable filter plate 3 relative to the central fixed filter plate 4 can be controlled by driving the filter plate expansion device 20. A lower fixing nut 12 is welded and fixed to the lower surface of the cover plate 11. After the central screw 5 passes through the cover plate 11, it is threadedly connected to the lower fixing nut 12, so that the clamping blocks 5-1 on both sides of the central screw 5 are located on the top (upper surface) of the cover plate 11.

[0051] As Figure 1 shown in the figure, when the left movable filter plate 2 and the right movable filter plate 3 are closed relative to the central fixed filter plate 4, the three form an approximate rectangular structure, which is convenient for installing / replacing the filter cloth 24. At this time, the clamping block 5-1 is inserted into the semi-circular clamping block groove 9, clamping the left movable filter plate 2 and the right movable filter plate 3 tightly, preventing one of the two movable filter plates from moving downward due to its own weight, and making the filter plate reach the best state of收拢 (the overall perimeter from the head to the root is equal). At the same time, the upper end of the central screw 5 extends outwards from the semi-circular clamping block groove 9.

[0052] Refer to Appendix Figure 2 、 4 、5, when the left movable filter plate 2 and the right movable filter plate 3 are opened relative to the central fixed filter plate 4, the three form an approximate trapezoidal structure, which can撑开 the filter cloth 24 sleeved outside the filter plate. At the same time, a support plate 6 is placed between the left movable filter plate 2 and the right movable filter plate 3 for support. As Figure 8 shown in the figure, a screw waist-shaped hole 6-1 is provided on the support plate 6, which can be inserted into the clamping block 5-1. The length of the support plate 6 matches the maximum opening distance between the left movable filter plate 2 and the right movable filter plate 3. The filter cloth 24 is preferably in a bag shape, and the perimeter of the lower opening of the filter cloth 24 is slightly larger than the perimeter of the top after the left movable filter plate 2, the right movable filter plate 3 and the central fixed filter plate 4 are closed (so that the filter cloth 24 can be smoothly installed when the two side movable filter plates are closed). At the same time, the lower opening of the filter cloth 24 is tightened with a hoop 25 to the connecting base 1. As Figure 5 、 6 、7 shown in the figure, when the left movable filter plate 2 and the right movable filter plate 3 are fully opened relative to the central fixed filter plate 4, the filter cloth 24 is tensioned. At this time, a clamping plate 21 is installed on the overall head of the filter plate. The clamping plate 21 is in a "匚" shape, and a clamping groove 21-1 is provided on it. At the same time, a waist-shaped hole 21-2 is also provided at the center of the clamping plate 21. After the clamping plate 21 is installed, the central screw 5 passes through the waist-shaped hole 21-2 and is locked with an upper fixing nut 7, so as to压紧 the top end of the filter cloth 24 sleeved outside the filter plate.

[0053] As Figure 11 、 12As shown, there are screw fixing holes 16 on both sides of the connecting base 1. The connecting base 1 is connected to the fixing holes on both sides of the central shaft of the disc filter by screw 17, thereby fixing the filter plate on the central shaft of the disc filter. Compared with the traditional filter plate being fixed by pressure block, the filter plate is more stable during operation and is not easy to fall off, which improves the safety of machine operation.

[0054] Further, see attached document. Figure 13 , 14 The filter plate telescopic device 20 includes a rack 20-5, a sliding seat 20-3, and a movable handle 20-7. The sliding seat 20-3 is slidably installed along the length of the rack 20-5, while the movable handle 20-7 is rotatably connected to the sliding seat 20-3 via a pin. A fixed support rod 20-1 is welded and fixed to the front end of the rack 20-5, and a movable support rod 20-9 is welded and fixed to the sliding seat 20-3. A gear 20-6, driven by the movable handle 20-7, is rotatably installed inside the sliding seat 20-3, and the gear 20-6 meshes with the rack 20-5. When the movable handle 20-7 is rotated, the gear 20-6 is synchronously driven to slide along the rack 20-5, causing the movable support rod 20-9 to open or close relative to the fixed support rod 20-1. A handle 20-4 is welded and fixed to the side wall of the rack 20-5 via a connecting rod 20-2 for easy gripping during operation. A limiting tongue 20-8 is rotatably connected inside the sliding seat 20-3 to prevent the gear 20-6 from engaging with the rack 20-5.

[0055] like Figure 15 , 16 As shown, when the filter plate needs to be opened or closed, the fixed support rod 20-1 and the movable support rod 20-9 are respectively placed into the corresponding opening holes 8 on the left movable filter plate 2 or the right movable filter plate 3. Then, hold the lifting handle 20-4 with one hand and rotate the movable handle 20-7 with the other hand to drive the sliding seat 20-3 to slide along the rack 20-5, thereby controlling the left movable filter plate 2 to open or close relative to the right movable filter plate 3.

[0056] The working process of this invention: When replacing filter cloth 24, first as follows Figure 4 , 5 As shown, disassemble the upper fixing nut 7, the clamping plate 21, and the support plate 6 in sequence to expose the opening hole 8. Then, as... Figure 16 As shown, the fixed support rod 20-1 and the movable support rod 20-9 of the filter plate telescopic device 20 are respectively placed into the corresponding opening holes 8 on the left movable filter plate 2 or the right movable filter plate 3. The movable handle 20-7 is cranked by hand, and the movable support rod 20-9 is driven by the sliding seat 20-3 to gradually close relative to the fixed support rod 20-1. The left movable filter plate 2 and the right movable filter plate 3 retract towards the central fixed filter plate 4, and the circumference (width) of the filter plate head gradually decreases until the left and right movable filter plates completely cover the central fixed filter plate 4. Figure 15As shown. At this time, the semi-circular locking slot 9 closes, and the locking block 5-1 of the central screw 5 at the top of the central fixed filter plate 4 rotates and locks the semi-circular locking slot 9. The overall circumference of the head and bottom of the filter plate is consistent, forming an approximately rectangular structure. The filter cloth 24 can be quickly put on from the head (or removed and replaced) to the root of the filter plate.

[0057] After replacement, use the filter plate telescopic device 20 to insert the fixed support rod 20-1 and the movable support rod 20-9 into the corresponding opening holes 8 on the left movable filter plate 2 or the right movable filter plate 3, respectively. Driven by the sliding seat 20-3, the movable support rod 20-9 gradually opens relative to the fixed support rod 20-1, causing the circumference of the filter plate head to gradually increase, forming an approximately trapezoidal structure. When the left movable filter plate 2 and the right movable filter plate 3 are fully extended, place a rectangular support plate 6 on the top of the central fixed filter plate 4. After the filter cloth 24 has wrapped the top filter plate, cover it with the clamping plate 21 and install the fixing nut 7. Figure 5 As shown, press the filter cloth 24 tightly.

[0058] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this invention should fall within the scope of protection of the appended claims.

Claims

1. A retractable filter plate, comprising a connecting base (1), a left movable filter plate (2), a right movable filter plate (3), a central fixed filter plate (4), a filter cloth (24), and a support plate (6), characterized in that: A filter plate telescopic device (20) is set outside the central fixed filter plate (4). The central fixed filter plate (4) is fixed on the connecting base (1). The left movable filter plate (2) is rotatably fitted on the left side of the central fixed filter plate (4), and the right movable filter plate (3) is rotatably fitted on the right side of the central fixed filter plate (4). The top of the central fixed filter plate (4) is rotatably connected to the central screw (5). A locking block (5-1) is set on the outer wall of the central screw (5). A semi-circular locking block groove (9) is opened on the left movable filter plate (2) and the right movable filter plate (3) at the position corresponding to the central screw (5). The left movable filter plate (2) and the right movable filter plate (3) are both provided with opening holes (8) that match the filter plate telescopic device (20). The left movable filter plate (2) and the right movable filter plate (3) are controlled to open and close relative to the central fixed filter plate (4) by driving the filter plate telescopic device (20). When the left movable filter plate (2) and the right movable filter plate (3) are closed relative to the central fixed filter plate (4), the three form an approximately rectangular structure, which facilitates the loading and unloading of the filter cloth (24). At this time, the locking block (5-1) is inserted into the semi-circular locking block groove (9) to fasten the left movable filter plate (2) and the right movable filter plate (3). When the left movable filter plate (2) and the right movable filter plate (3) open relative to the central fixed filter plate (4), the three form an approximately trapezoidal structure, which expands the filter cloth (24). At the same time, a support plate (6) is placed between the left movable filter plate (2) and the right movable filter plate (3) for support. The filter plate telescopic device (20) includes a rack (20-5), a sliding seat (20-3) slidably mounted on the rack (20-5), and a movable handle (20-7) rotatably connected to the sliding seat (20-3). A fixed support rod (20-1) is provided at one end of the rack (20-5), and a movable support rod (20-9) is provided on the sliding seat (20-3) to cooperate with the fixed support rod (20-1) to be placed into the opening hole (8) on the left movable filter plate (2) or the right movable filter plate (3), respectively. A gear (20-6) driven by the movable handle (20-7) is provided in the sliding seat (20-3). The gear (20-6) meshes with the rack (20-5). When the movable handle (20-7) is rotated, the gear (20-6) is synchronously driven to slide along the rack (20-5), so that the movable support rod (20-9) opens or closes relative to the fixed support rod (20-1).

2. The expandable filter plate according to claim 1, characterized in that: The central fixed filter plate (4) includes a front plate (4-1) and a rear plate (4-2) spaced apart, and reinforcing ribs (10) are welded to both sides of the front plate (4-1) and the rear plate (4-2). The tops of the front plate (4-1) and the rear plate (4-2) are connected and fixed by a cover plate (11), and the bottoms of the front plate (4-1) and the rear plate (4-2) are fixed to the connecting base (1). An inner cavity of the central fixed filter plate (4) is formed between the front plate (4-1) and the rear plate (4-2), and at least one reinforcing rib (10) is placed in the inner cavity, and the reinforcing rib (10) is welded and fixed to the front plate (4-1) and the rear plate (4-2) respectively.

3. The expandable filter plate according to claim 2, characterized in that: The left movable filter plate (2), right movable filter plate (3), front plate (4-1), rear plate (4-2) and reinforcing rib plate (10) are all provided with a number of filter holes (23).

4. The expandable filter plate according to claim 2, characterized in that: The bottom of the cover plate (11) is fixed with a lower fixing nut (12). The center screw (5) passes through the cover plate (11) and is connected to the lower fixing nut (12), so that the locking blocks (5-1) on both sides of the center screw (5) are located on the top of the cover plate (11). When the left movable filter plate (2) and the right movable filter plate (3) are closed relative to the center fixed filter plate (4), the upper end of the center screw (5) extends out from the semi-circular locking block groove (9).

5. The expandable filter plate according to claim 1, characterized in that: The support plate (6) has a screw waist-shaped hole (6-1) for inserting the card block (5-1). The length of the support plate (6) matches the maximum opening distance of the left movable filter plate (2) and the right movable filter plate (3).

6. The expandable filter plate according to claim 5, characterized in that: It also includes a clamping plate (21) for slotted installation on the top of the relatively open left movable filter plate (2) and right movable filter plate (3), so that the center screw (5) passes through the waist-shaped hole (21-2) of the clamping plate (21) and is locked with the upper fixing nut (7), thereby pressing the top of the filter cloth (24) fitted outside the retractable filter plate.

7. The expandable filter plate according to claim 1, characterized in that: The filter cloth (24) is bag-shaped. The width of the bottom opening of the filter cloth (24) is greater than the width of the top of the left movable filter plate (2), the right movable filter plate (3) and the central fixed filter plate (4) after they are closed. The bottom opening of the filter cloth (24) is tied with a clamp (25). When the left movable filter plate (2) and the right movable filter plate (3) are fully opened relative to the central fixed filter plate (4), the filter cloth (24) is tensioned.

8. The expandable filter plate according to claim 1, characterized in that: The connecting base (1) has screw fixing holes (16) on both sides. The connecting base (1) is connected to the fixing holes on both sides of the central shaft of the disc filter by screws (17), thereby fixing the filter plate on the central shaft of the disc filter.

9. The expandable filter plate according to claim 1, characterized in that: A handle (20-4) is fixed to the side wall of the rack (20-5) via a connecting rod (20-2). A limiting tongue (20-8) is rotatably connected inside the sliding seat (20-3) to prevent the gear (20-6) from engaging with the rack (20-5).

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