Telescopic filter plate

Abstract

The utility model discloses a telescopic filter plate, which relates to the field of disc filters and comprises 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, and the left side of the central fixed filter plate is sleeved with the left movable filter plate in a relatively rotating manner; the top of the center fixed filter plate is rotatably connected with a center screw, a clamping block is arranged on the outer wall of the center screw, and semicircular clamping block grooves are formed in the positions, corresponding to the center screw, of the left movable filter plate and the right movable filter plate; the left movable filter plate and the right movable filter plate are provided with opening holes matched with the filter plate telescopic device, and the filter plate telescopic device is driven to control the left movable filter plate and the right movable filter plate to be opened and closed relative to the center fixed filter plate. The utility model solves the problem that the wide head opening of the filter plate cannot be sleeved by the narrow bottom opening of the trapezoidal filter cloth because the circumference of the head of the traditional filter plate is large and the circumference of the bottom of the cloth opening of the filter cloth is small.

Description

Technical Field

[0001] The utility model relates to the field of disc filters, in particular to a retractable filter plate. Background Art

[0002] The filter plate of the disc filter needs to be covered with a filter bag before it can be used. During the filtering process, the filter bag needs to be replaced regularly. The existing disc filter filter discs are mostly disc-shaped structures, which are composed of several trapezoidal filter plates. Since the width of the head of the filter plate is greater than the width of the tail, the filter bag cannot be directly replaced on the filter plate. The single filter plate needs to be removed from the central axis. The filter plate is large in size and weight, and the installation and removal process requires a lot of manpower and material resources, and is time-consuming and complicated to install.

[0003] For example, Chinese patent document (CN113509780A) discloses a disc filter disc, which includes a plurality of fan-shaped plates, each of which has a front side and a back side which is an opposite side surface of the front side, the front sides of the fan-shaped plates together constitute the front side of the disc filter disc, the back sides of the fan-shaped plates together constitute the back side of the disc filter disc, each of the fan-shaped plates also has an outer arc edge and an inner edge opposite to the outer arc edge, each of the outer arc edges together constitute the outer circumference of the disc filter disc, each of the fan-shaped plates also has a first side edge and a second side edge connecting the outer arc edge and the inner edge; a plurality of filter bags, the front and back sides of the fan-shaped plates are covered by the filter bags; a plurality of outer frames, the outer frames are buckled on the fan-shaped plates in a manner of clamping the filter bags. When replacing filter bags with existing traditional filter plates, it is necessary to first remove the external guide rails, then remove each filter plate from the central axis of the filter machine, manually carry it to the field, then remove the filter bag from the filter plate, and then replace it with a new filter bag. After the filter bag is replaced, the filter plate is installed back on the central axis of the filter machine, and finally the external guide rails are installed. Due to the large mass of the filter plate, the entire process is not only time-consuming and labor-intensive, but also seriously affects production efficiency. In addition, the traditional filter plate needs to be disassembled and replaced every 45 days. Due to repeated disassembly, the life of the central axis thread on the disc filter is greatly reduced. If the thread is broken, it is necessary to re-tap the central axis. The internal space of the disc filter is small, and the tapping operation is very difficult.

[0004] Chinese patent document (CN112495043A) discloses a non-disassembly filter plate of a disc filter, including a filter plate body, the filter plate body is composed of one or more fan-shaped units installed on a central axis, and a mounting hole for mounting the fan-shaped unit is provided on the central axis. When multiple fan-shaped units are provided, the multiple fan-shaped units share a flow channel, and the mounting holes on the central axis are evenly arranged along the circumferential direction; the fan-shaped unit is in the shape of an elongated strip, the upper end of the fan-shaped unit is set to be flat, and the lower end is set to be elliptical, and there is a smooth transition between the upper end and the lower end of the fan-shaped unit, and the thickness direction is gradually thickened from top to bottom, and the width direction is gradually narrowed from top to bottom, and the outer contour circumference of any cross section of the fan-shaped unit perpendicular to the axial direction is equal. This patented solution is now used on the largest disc filter in the country. For a large disc filter, a filter has a total of 576 filter plates. It takes about 45-60 minutes to remove and replace a single filter plate on site. Even if the above-mentioned non-disassembly filter plate is used, if all the filter cloths of the entire machine are replaced, it will still take about 21 days, resulting in a waste of production capacity. Moreover, the disc filter needs to be cleaned with water on the surface of the filter cloth before shutting down. After the surface is cleaned, workers also need to use a high-pressure water gun to clean the slag remaining between the plates to facilitate the disassembly of the traditional filter plate to replace the cloth off-site, and the flushing process takes a long time. In addition, due to the special design structure of the non-disassembly filter plate, the filter cloth can only be made of high-strength nylon cloth. The poor-strength polypropylene filter cloth cannot guarantee the life of the cloth (3-7 days), but nylon cloth is expensive, and the production cost of a single filter cloth is about 300 yuan, resulting in high production costs.

[0005] Traditional filter plates need to be moved off-site to change the cloth. During this process, 5 workers are required. The filter plates of ordinary disc filters are too heavy (20-25 kg), and the filter plates of large disc filters are even as heavy as 160 kg. The workers consume a lot of physical energy in the process of carrying the filter plates, and the replacement efficiency is low.

[0006] In order to facilitate the disassembly of the filter plate in traditional filter plate design, a pressing block is usually used to fix the filter plate on the central axis. The disadvantage of this method is that the filter plate has poor stability. During the operation of the machine, the filter plate will fall due to the loosening of the pressing block, causing different damages to the surrounding filter plates.

[0007] Chinese patent document (CN218357843U) discloses a retractable filter plate on a vacuum disc filter, which relates to the field of disc filters, including a connecting base, a left movable filter plate, a right movable filter plate, a fixed plate and an internal contraction device, wherein a connecting base is installed at the bottom of the fixed plate, a left movable filter plate is hinged on the left side of the connecting base, the left movable filter plate is sleeved on the left side of the fixed plate, a right movable filter plate is hinged on the right side of the connecting base, the right movable filter plate is sleeved on the right side of the fixed plate, and an internal contraction device is arranged in the fixed plate, and the internal contraction device drives the left movable filter plate and the right movable filter plate to open or close relative to the fixed plate; when the left movable filter plate and the right movable filter plate are opened relative to the fixed plate, the three form an approximately trapezoidal structure, and when the left movable filter plate and the right movable filter plate are closed relative to the fixed plate, the three form an approximately rectangular structure. However, the technical solution relies on the internal contraction device to realize the telescopic opening and closing of the left and right movable filter plates, and there is a problem that the internal contraction device cannot freely extend and retract the left and right filter plates due to crystallization of the filtrate during operation. In the prior art, there are also alumina filter plates made in the form of corrugated plates, but the disadvantage is that the inner cavity of the filter plate is narrow and severely crystallized, which can easily block the inner cavity and cause a significant decrease in production. Utility Model Content

[0008] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a retractable filter plate, which solves the problem that the traditional filter plate has a large head circumference, a small bottom circumference of the filter cloth opening, and the trapezoidal filter cloth cannot fit the narrow bottom opening of the filter plate to the wide head opening of the filter plate. There is no need to disassemble the entire filter plate from the central axis of the disc filter and transport it to the field for cloth replacement, which makes it easier to replace the filter cloth, shortens the cloth replacement time, reduces the weight of the filter plate, reduces labor costs during transportation, and effectively improves production capacity. Compared with the traditional contraction mechanism, the center plate of the filter plate is not equipped with a telescopic device, but is opened and retracted by an external tool filter plate telescopic device, which avoids the problem that the left and right filter plates cannot be freely extended and retracted due to crystallization of the filtrate during the operation of the filter plate due to the internal telescopic device.

[0009] The purpose of the utility model is achieved through the following technical solutions: the retractable filter plate comprises a connecting base, a left movable filter plate, a right movable filter plate, a central fixed filter plate and a filter plate retracting device, wherein the central fixed filter plate is fixed on the connecting base, the left side of the central fixed filter plate is relatively rotatably sleeved with the left movable filter plate, the right side of the central fixed filter plate is relatively rotatably sleeved with the right movable filter plate, the top of the central fixed filter plate is rotatably connected to the central screw, a card block is arranged on the outer wall of the central screw, a semicircular card block groove is arranged at a position corresponding to the central screw on the left movable filter plate and the right movable filter plate, a propping hole matching the filter plate retracting device is arranged on both the left movable filter plate and the right movable filter plate, and the opening and closing of the left movable filter plate and the right movable filter plate relative to the central fixed filter plate is controlled by driving the filter plate retracting 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 installing and unloading the 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撑开 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, and 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 at 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 also 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 using 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 head is provided with left and right circular holes at the front and rear, and the filter plate is fixed in the center. The circular holes at the bottom of the left and right movable filter plates are connected to the circular holes of the connecting base through 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 strut is provided at one end of the rack, and a movable strut is provided on the sliding seat, which is used to cooperate with the fixed strut to be placed in the open holes on the left movable filter plate or the right movable filter plate respectively; a gear connected and driven by the movable handle is provided in the sliding seat, and the gear is meshed with the rack. When the movable handle is rotated, the gear is synchronously driven to slide along the rack, so that the movable strut is opened or closed relative to the fixed strut.

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

[0022] The beneficial effects of the utility model are:

[0023] 1. Save time for cloth replacement: The disc filter invented by our company can control the time for cloth removal and cloth replacement within 6 minutes. It takes about 2 days to replace the entire filter cloth. Compared with the filter plate that takes 21 days to replace the cloth, the cloth replacement time is greatly shortened. The time saved by cloth replacement can be converted into production capacity, achieving an increase of about 3 times in production capacity.

[0024] 2. Avoid the loss of the central axis of the whole machine and save manpower: The retractable filter plate invented by our company will be fixed on the central axis for a long time and does not need to be disassembled. You only need to carry the filter cloth (1-2 kg) to the site for cloth replacement. The required cloth replacement workers are 2 people, which saves a lot of manpower consumption in the cloth replacement process; it will not be disassembled until the life of the filter plate (generally 2-3 years) expires, which will not affect the thread loss on the central axis and avoid the maintenance problems caused by repeated disassembly of the filter plate on the central axis of the whole machine; and the weight of a single filter plate is about 80 kg, compared with the super-large filter plate of 160 kg, it reduces the energy consumption of the machine during operation.

[0025] 3. Omit the high-pressure water gun flushing step: The retractable filter plate invented by our company does not need to use a high-pressure water gun to clean the slag remaining in the gap between the plates. It only needs to shrink the left and right movable filter plates through the telescopic device and move them closer to the central fixed filter plate. At this time, there is enough space on the left and right sides of the filter plate, and the old filter cloth can be easily pulled out and replaced with a new one.

[0026] 4. Improved safety and stability of the filter plate: Our company invented the retractable filter plate. Considering that the filter plate is fixed on the central axis of the disc filter for a long time, anti-loosening screws and nuts are used to directly engage with the threads on the central axis. The stability of the filter plate is greatly increased, and it is not easy to fall off during operation, reducing the occurrence of safety accidents of the machine.

[0027] 5. The production capacity is not affected by crystallization in the inner cavity: the filter plate is opened and closed by an external tool telescopic device, and no longer relies on the internal telescopic device to achieve telescopic opening and closing, so that the inner cavity space of the filter plate is large, the probability of crystallization is low, and the output is not affected by crystallization.

[0028] 6. Save cloth costs: The retractable filter plate invented by our company is used on super-large filter plates. It does not require high-strength nylon cloth. Ordinary polypropylene non-woven fabric can achieve the same filtering effect. The life of the cloth (about 45 days) is about 80 yuan for a single piece of filter cloth, which is low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the utility model in a closed state.

[0030] Figure 2 It is a schematic diagram of the structure of the utility model in the opened state.

[0031] Figure 3 It is a schematic diagram of the connection structure between the cover plate and the central screw in the utility model.

[0032] Figure 4 It is a schematic diagram of the structure of the utility model after the support plate is installed in the open state.

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

[0034] Figure 6 It is a three-dimensional structural schematic diagram of the clamping plate in the utility model.

[0035] Figure 7 It is a bottom view structural schematic diagram of the clamping plate in the utility model.

[0036] Figure 8 It is a structural schematic diagram of the support plate in the utility model.

[0037] Fig. 9 It is a structural schematic diagram of the center screw in the utility model.

[0038] Fig.10 It is a schematic diagram of the connection structure between the front plate and the rear plate in the utility model.

[0039] Fig.11 It is a structural schematic diagram of the connecting base in the utility model.

[0040] Fig.12 It is a structural schematic diagram of the handle screw in the utility model.

[0041] Fig.13 The structure diagram of the filter plate telescopic device of the utility model is shown in FIG. Figure 1 .

[0042] Fig.14 The structure diagram of the filter plate telescopic device of the utility model is shown in FIG. Figure 2 .

[0043] Fig.15 It is a structural schematic diagram of the utility model when the filter plate telescopic device is used to close the left and right movable filter plates.

[0044] Fig.16 It is a structural schematic diagram of the utility model when the filter plate telescopic device is used to open the left and right movable filter plates.

[0045] Fig.17 It is a schematic cross-sectional structure diagram of the central fixed filter plate in the utility model.

[0046] Explanation of the reference numerals in the accompanying drawings: connecting base 1, left movable filter plate 2, right movable filter plate 3, central fixed filter plate 4, front plate 4-1, rear plate 4-2, central screw 5, clamping block 5-1, supporting plate 6, screw waist-shaped hole 6-1, upper fixing nut 7, support hole 8, semicircular clamping block groove 9, reinforcing rib plate 10, cover plate 11, lower fixing nut 12, left circular hole 13, right circular hole 14, pin 15, handle screw fixing hole 16, handle screw 17, filter plate telescopic device 20, fixed support rod 20-1, connecting rod 20-2, sliding seat 20-3, lifting handle 20-4, rack 20-5, gear 20-6, movable handle 20-7, limiting tongue 20-8, movable support rod 20-9, clamping plate 21, clamping slot 21-1, waist-shaped hole 21-2, filter hole 23, filter cloth 24, hoop 25. DETAILED DESCRIPTION

[0047] The utility model will be described in detail below with reference to the accompanying drawings:

[0048] Example: As attached Figures 1 to 17As shown, the retractable filter plate comprises 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 clamping block 5-1, a support plate 6, a screw waist-shaped hole 6-1, an upper fixing nut 7, a support hole 8, a semicircular clamping block groove 9, a reinforcing rib plate 10, a cover plate 11, a lower fixing nut 12, a left circular hole 13, a right circular hole 14, a pin 15, a screw fixing hole 16, a 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 clamping plate 21, a clamping groove 21-1, a waist-shaped hole 21-2, a filtering hole 23, a filter cloth 24 and a hoop 25.

[0049] Reference Figure 2 , 10 The central fixed filter plate 4 is fixed on the connection base 1. The central fixed filter plate 4 includes a front plate 4-1 and a rear plate 4-2 which are spaced apart. Both sides of the front plate 4-1 and the rear plate 4-2 are welded with reinforcing ribs 10. The tops of the front plate 4-1 and the rear plate 4-2 are connected and fixed by a cover plate 11. The bottoms of the front plate 4-1 and the rear plate 4-2 are fixed to the connection base 1. Fig.17 As shown, 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 two reinforcing rib plates 10 are placed in the inner cavity. At the same time, the two reinforcing rib plates 10 are welded and fixed to the front plate 4-1 and the rear plate 4-2 respectively. A plurality of filter holes 23 are provided 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 rib plates 10.

[0050] like Figure 2 , 4 As shown, a left circular hole 13 is provided on the left side of the central fixed filter plate 4, a left circular hole 13 is provided at a corresponding position on the left movable filter plate 2, and a left circular hole 13 is also provided on the left side of the connecting base 1. The left movable filter plate 2 is relatively rotatably sleeved on the left side of the central fixed filter plate 4, and a pin 15 is installed in the left circular hole 13 for connection. A right circular hole 14 is provided on the right side of the central fixed filter plate 4, a right circular hole 14 is provided at a corresponding position on the right movable filter plate 3, and a right circular hole 14 is also provided on the right side of the connecting base 1. The right movable filter plate 3 is relatively rotatably sleeved on the right side of the central fixed filter plate 4, and a pin 15 is installed in 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 formed 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 telescopic 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 telescopic 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 to fasten the left movable filter plate 2 and the right movable filter plate 3, preventing one of the two movable filter plates from moving downward due to its own weight, so that the filter plate reaches the best state of收拢 (the overall circumference 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 formed on the support plate 6, which can be clamped 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 circumference of the lower opening of the filter cloth 24 is slightly larger than the circumference 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 formed on it. At the same time, a waist-shaped hole 21-2 is also formed in 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 press the top end of the filter cloth 24 sleeved outside the filter plate.

[0053] As Fig.11 、 12As shown, screw fixing holes 16 are provided on both sides of the connecting base 1, and the connecting base 1 is connected with the fixing holes on both sides of the central axis of the disc filter by screws 17, so that the filter plate is fixed on the central axis of the disc filter. Compared with the traditional filter plate fixed by a pressing block, the filter plate is more stable during operation and is not easy to fall off, thereby improving the safety of the machine operation.

[0054] For further information, see Attachment Fig.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 direction of the rack 20-5, and the movable handle 20-7 is rotatably connected to the sliding seat 20-3 through 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 connected and driven by the movable handle 20-7 is rotatably arranged in the sliding seat 20-3, and the gear 20-6 is meshed with the rack 20-5. When the movable handle 20-7 is rotated, the synchronously driven gear 20-6 slides along the rack 20-5, so that the movable support rod 20-9 opens or closes 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 through a connecting rod 20-2 for easy holding during operation. A limiting tongue 20-8 is rotatably connected in the sliding seat 20-3 to prevent the gear 20-6 from cooperating with the rack 20-5.

[0055] like Fig.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 in the corresponding support holes 8 on the left movable filter plate 2 or the right movable filter plate 3, and then the lifting handle 20-4 is held with one hand and the movable handle 20-7 is turned 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 the utility model: when replacing the filter cloth 24, first Figure 4 , 5 As shown, the upper fixing nut 7, the clamping plate 21 and the supporting plate 6 are removed in sequence to expose the support hole 8. Then, as shown in FIG. Fig.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 in the corresponding support holes 8 on the left movable filter plate 2 or the right movable filter plate 3, and the movable handle 20-7 is manually cranked to drive the movable support rod 20-9 to gradually close relative to the fixed support rod 20-1 through the sliding seat 20-3, and the left movable filter plate 2 and the right movable filter plate 3 are contracted toward the central fixed filter plate 4, and the circumference (width) of the filter plate head is gradually reduced until the left and right movable filter plates completely wrap the central fixed filter plate 4, as shown in FIG. Fig.15At this time, the semicircular block groove 9 is closed, the block 5-1 of the center screw 5 at the top of the center fixed filter plate 4 is rotated to buckle the semicircular block groove 9, the circumference of the head and bottom of the filter plate are consistent as a whole, forming an approximately rectangular structure, and the filter cloth 24 can be quickly inserted (or removed and replaced) from the head to the root of the filter plate.

[0057] After the replacement is completed, use the filter plate expansion and contraction device 20 again, and place the fixed support rod 20-1 and the movable support rod 20-9 of the filter plate expansion and contraction device 20 into the corresponding support holes 8 on the left movable filter plate 2 or the right movable filter plate 3 respectively, and drive the movable support rod 20-9 to gradually open relative to the fixed support rod 20-1 through the sliding seat 20-3, so that the circumference of the filter plate head gradually increases, forming an approximately trapezoidal structure. When the left movable filter plate 2 and the right movable filter plate 3 are expanded to the maximum, a rectangular support plate 6 is placed on the top of the central fixed filter plate 4. After the filter cloth 24 wraps the top filter plate, cover the clamping plate 21 and install the fixing nut 7, as shown in FIG. Figure 5 As shown, the filter cloth 24 is compressed.

[0058] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.

Claims

1. A retractable filter plate, comprising a connecting base (1), a left movable filter plate (2), a right movable filter plate (3) and a central fixed filter plate (4), characterized in that: It also includes a filter plate telescopic device (20), wherein the central fixed filter plate (4) is fixed on the connecting base (1), the left side of the central fixed filter plate (4) is relatively rotatably sleeved with a left movable filter plate (2), and the right side of the central fixed filter plate (4) is relatively rotatably sleeved with a right movable filter plate (3), the top of the central fixed filter plate (4) is rotatably connected to a central screw (5), a clamping block (5-1) is provided on the outer wall of the central screw (5), a semicircular clamping block groove (9) is provided at a position corresponding to the central screw (5) on the left movable filter plate (2) and the right movable filter plate (3), and a support hole (8) matching the filter plate telescopic device (20) is provided on the left movable filter plate (2) and the right movable filter plate (3), and the filter plate telescopic device (20) is driven to control the opening and closing of the left movable filter plate (2) and the right movable filter plate (3) relative to the central fixed filter plate (4); 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 a nearly rectangular structure, which is convenient for loading and unloading the filter cloth (24). At this time, the clamping block (5-1) is inserted into the semicircular clamping 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) are opened relative to the central fixed filter plate (4), the three form a nearly trapezoidal structure, which stretches the filter cloth (24), and 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) comprises 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 arranged at one end of the rack (20-5); a movable support rod (20-9) is arranged on the sliding seat (20-3) and is used to cooperate with the fixed support rod (20-1) to be respectively placed in a support hole (8) on the left movable filter plate (2) or the right movable filter plate (3); a gear (20-6) connected and driven by the movable handle (20-7) is arranged in the sliding seat (20-3); the gear (20-6) is meshed with the rack (20-5); when the movable handle (20-7) is rotated, the synchronously driven gear (20-6) slides along the rack (20-5), so that the movable support rod (20-9) is opened or closed relative to the fixed support rod (20-1).

2. The retractable filter plate according to claim 1, characterized in that: The central fixed filter plate (4) comprises a front plate (4-1) and a rear plate (4-2) which are arranged at intervals, and reinforcing rib plates (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 via a cover plate (11), and the bottoms of the front plate (4-1) and the rear plate (4-2) are fixed to a 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 plate (10) is placed in the inner cavity, and the reinforcing rib plates (10) are respectively welded and fixed to the front plate (4-1) and the rear plate (4-2).

3. The retractable filter plate according to claim 2, characterized in that: A plurality of filter holes (23) are provided 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 rib plate (10).

4. The retractable filter plate according to claim 2, characterized in that: A lower fixing nut (12) is fixed to the bottom of the cover plate (11), and the central screw (5) passes through the cover plate (11) and is connected to the lower fixing nut (12), so that the clamping blocks (5-1) on both sides of the central screw (5) are located at 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 central fixed filter plate (4), the upper end of the central screw (5) protrudes from the semicircular clamping block groove (9).

5. The retractable filter plate according to claim 1, characterized in that: The support plate (6) is provided with a screw waist-shaped hole (6-1) for clamping the clamping block (5-1), and 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 retractable filter plate according to claim 5, characterized in that: It also includes a clamping plate (21) for being installed in a slot-type manner on the top ends of the relatively opened left movable filter plate (2) and right movable filter plate (3), so that a central screw (5) passes through a waist-shaped hole (21-2) of the clamping plate (21) and is locked with a fixing nut (7), thereby pressing the top end of the filter cloth (24) sleeved outside the retractable filter plate.

7. The retractable filter plate according to claim 1, characterized in that: The filter cloth (24) is bag-shaped, the width of the lower end 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) when they are closed, and the lower end of the filter cloth (24) is fastened by 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 retractable filter plate according to claim 1, characterized in that: The connection base (1) is provided with screw fixing holes (16) on both sides, and the connection base (1) is connected to the fixing holes on both sides of the central axis of the disc filter by screws (17), thereby fixing the filter plate on the central axis of the disc filter.

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

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