Barrel-type filter

Abstract

This utility model discloses a barrel-type filter, including a barrel body, a sweeping cover, a filter assembly, a locking screw, and a lifting eye nut. The interior of the barrel body is a filter chamber, and the barrel body has an inlet, an outlet, and an opening. The filter assembly is placed into the filter chamber through the opening. A locking screw is located at the top of the barrel body. The sweeping cover is integrally formed from a cover body and a top pressure strip. The top pressure strip has protrusions at both ends, and the protrusions have mounting holes. The locking screw passes through the mounting holes, allowing the sweeping cover to be mounted on the top of the barrel body via the top pressure strip. The lifting eye nut is threaded onto the locking screw and located above the top pressure strip, used to press the top pressure strip downwards. By integrally forming the cover body and the top pressure strip, the traditional split structure is abandoned, the number of parts is reduced, and the assembly and maintenance procedures are simplified. At the same time, the overall structural strength of the sweeping cover is greatly improved, making it less prone to deformation under pressure, ensuring a tight seal with the opening of the barrel body, effectively preventing media leakage, and improving the long-term operational reliability of the equipment.

Description

This utility model relates to the field of filter technology, and more particularly to a barrel-type filter. Background Art: Existing filters include a cylindrical body with an inlet and an outlet arranged opposite each other. A filter screen is installed inside the cylindrical body, and an opening at the top for removing and placing the filter screen is provided. A cleaning cover is fitted at the opening. In traditional structures, after the cleaning cover is closed onto the opening at the top of the cylindrical body, an independent pressure strip is used to press the cleaning cover onto it. A locking screw is erected at the top of the cylindrical body, and the two ends of the pressure strip are sleeved on the outside of the screw. A handwheel is then used to screw the pressure strip onto the screw, thus sealing and fixing the cleaning cover. This type of split-type locking structure has complex parts, making assembly and disassembly inconvenient; the pressure strip and the cleaning cover are independent of each other, resulting in poor overall structural strength, easy deformation under pressure, and long-term use can easily lead to sealing failure and media leakage; furthermore, the processing and assembly of split components involves many steps, resulting in high maintenance costs, and loose parts are easily lost, seriously affecting the ease of assembly and long-term reliability of the filter. In response to the problems raised in the background art, the purpose of this utility model is to propose a barrel-shaped filter that solves the problems of existing filters having many separate components and numerous processing and assembly steps. To achieve this objective, the present invention adopts the following technical solution: A barrel-type filter, comprising a barrel body, a sweeping cover, a filter assembly, locking screws, and a lifting eye nut; the interior of the barrel body is a filter chamber, and the barrel body has an inlet and an outlet on both sides, and an opening at the top of the barrel body, through which the filter assembly is placed into the filter chamber; at least two locking screws are provided at the top of the barrel body, and the locking screws extend vertically; the sweeping cover is integrally formed from a cover body and a top pressure strip, and the two ends of the top pressure strip extend to the outside of the cover body and form two protrusions, the protrusions having through-holes; the locking screws are correspondingly vertically inserted into the mounting holes, so that the sweeping cover is mounted on the top of the barrel body through the top pressure strip; the lifting eye nut is threaded onto the locking screws and located above the top pressure strip, and the lifting eye nut is used to press the top pressure strip downwards. Preferably, the cylinder body is provided with a feed pressure measuring section and a discharge pressure measuring section, the feed pressure measuring section being located at the feed inlet and the discharge pressure measuring section being located at the discharge outlet, and the feed pressure measuring section and the discharge pressure measuring section being communicatively connected to a differential pressure transmitter respectively. Preferably, the filter assembly includes a filter screen, a top support, and a bottom support, the upper and lower ends of the filter screen being fixed between the top support and the bottom support respectively; the top support is elliptical in shape and is positioned directly opposite the feed inlet. Preferably, the top support is also provided with a lifting handle, the lifting handle extending upwards. Preferably, the pore size of the filter screen is d, where 0.1mm < d ≤ 30mm. Preferably, a drain port is provided on the lower side wall of the cylinder body, and a drain plug is removably installed at the drain port.Preferably, the lifting eye nut comprises an integrally formed lifting eye portion and a nut portion; the lifting eye portion has a through hole inside; the nut portion is a cylindrical structure with an internal thread, and the internal thread of the nut portion is screwed into the locking screw thread. Preferably, the inner wall of the cylinder is provided with a raised ring, which extends circumferentially along the inner wall of the cylinder; when the filter assembly is placed in the filter chamber, the top surface of the raised ring abuts against the lower surface of the top support, and the raised ring is used to limit the top of the filter assembly. Preferably, the bottom of the inner wall of the cylinder is also provided with a plurality of limiting protrusions, which are evenly spaced along the inner wall of the cylinder; when the filter assembly is placed in the filter chamber, the top surface of the limiting protrusions abuts against the bottom of the filter assembly, and the limiting protrusions are used to support and limit the bottom of the filter assembly. Preferably, a sealing gasket is embedded in the inner side of the cover body of the sweeping cover. When the sweeping cover is closed on the top opening of the cylinder, the sealing gasket is pressed between the end face of the cover body and the end face of the cylinder body. Compared with the prior art, one of the above technical solutions has the following beneficial effects: 1. By integrally molding the cover body and the top pressure strip of the sweeping cover, the traditional split structure is abandoned, the number of parts is reduced, the assembly and maintenance process is simplified, and the loss of loose parts is avoided; at the same time, the overall structural strength of the sweeping cover is greatly improved, it is not easily deformed under pressure, ensures the tight seal with the opening of the cylinder body, effectively prevents media leakage, and improves the long-term operational reliability of the equipment. 2. Using a lifting eye nut instead of a traditional handwheel, common tools can be inserted into the lifting eye hole to form a lever force structure, extending the lever arm, reducing the effort required for turning, and facilitating disassembly and assembly. 3. The lifting eye of the lifting eye nut can also serve as a lifting force-bearing part, eliminating the need for additional lifting components, and can directly cooperate with lifting equipment to complete the transfer and installation of the filter, simplifying the overall structure and adapting to on-site construction needs. Figure 1 is a structural schematic diagram of one embodiment of the present invention; Figure 2 is a structural schematic diagram of another embodiment of the present invention from another angle; Figure 3 is a structural schematic diagram of the sweeping cover of the present invention; Figure 4 is a structural schematic diagram of the cylinder of the present invention; Figure 5 is a front view of the cylinder of the present invention; Figure 6 is a cross-sectional view of AA in Figure 5; Figure 7 is a cross-sectional view of BB in Figure 5; Figure 8 is a structural schematic diagram of the filter assembly of the present invention.The components include: cylinder 1, convex ring 11, limiting protrusion 12, feed inlet 01, discharge outlet 02, opening 03, drain outlet 04, cleaning cover 2, cover body 21, top pressure strip 22, protrusion 23, filter assembly 3, filter screen 31, top support 32, bottom support 33, lifting handle 34, locking screw 4, lifting eye nut 5, lifting eye part 51, nut part 52, feed pressure measuring part 61, discharge pressure measuring part 62, and differential pressure transmitter 63. Detailed Description of Embodiments: The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," and "third" may explicitly or implicitly include one or more of that feature. It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The technical solution of this utility model will be further described below with reference to Figures 1 to 8 and through specific embodiments.A barrel-type filter includes a barrel body 1, a sweeping cover 2, a filter assembly 3, locking screws 4, and a lifting eye nut 5. The interior of the barrel body 1 is a filter chamber. The barrel body 1 has an inlet 01 and an outlet 02 on both sides. The top of the barrel body 1 has an opening 03 through which the filter assembly 3 is inserted into the filter chamber. At least two locking screws 4 are provided on the top of the barrel body 1, extending vertically. The sweeping cover 2 is integrally formed from a cover body 21 and a top pressure strip 22. Both ends of the top pressure strip 22 extend to the outer side of the cover body 21, forming two protrusions 23, each protrusion having a through-hole. The locking screws 4 are vertically inserted into the mounting holes, allowing the sweeping cover 2 to be mounted on the top of the barrel body 1 via the top pressure strip 22. The lifting eye nut 5 is threaded onto the locking screws 4 and located on the top pressure strip 22. Above, the lifting eye nut 5 is used to press the top pressure strip 22 downwards. The barrel-type filter disclosed in this utility model is mainly composed of a barrel body 1, a sweeping cover 2, a filter assembly 3, locking screws 4, and lifting eye nuts 5. A filter chamber is formed inside the barrel body 1. An inlet 01 and an outlet 02 are correspondingly opened on the left and right sides of the barrel body 1. An opening 03 is opened at the top of the barrel body 1. The filter assembly 3 is directly inserted into the filter chamber through the opening 03 at the top of the barrel body 1 to complete the assembly. At least two locking screws 4 are vertically arranged at the top of the barrel body 1 for positioning and locking in conjunction with the sweeping cover 2 and lifting eye nuts 5. This invention features a sweeping cover 2 as an integral structure where the cover body 21 and the top pressure strip 22 are formed together. The top pressure strip 22 extends outwards at both ends to form protrusions 23, each with a through mounting hole. During assembly, the locking screw 4 is vertically inserted into the corresponding mounting hole, allowing the sweeping cover 2 to be directly mounted on the top of the cylinder 1 via the integrated top pressure strip 22, eliminating the need for an additional independent pressure strip component. Simultaneously, a lifting eye nut 5 is threaded onto the locking screw 4, positioned above the top pressure strip 22. Tightening the lifting eye nut 5 presses the top pressure strip 22 downwards, achieving a sealed and locked cover 2 against the opening 03 at the top of the cylinder 1.Compared to existing filters that use a separate assembly of the sweeping cover and independent pressure strip with a handwheel for locking, this embodiment integrates the cover 21 and the pressure strip 22 into a single unit. This eliminates the need for separate processing and assembly of the independent pressure strip, effectively simplifying the overall assembly structure, reducing the number of parts, avoiding the problems of easily lost parts and cumbersome disassembly and assembly later, and reducing processing and maintenance costs. The integrated sweeping cover 3 has good overall structure integrity and higher structural strength. During the screwing process of the lifting eye nut 5, the pressure strip 22 is evenly stressed and not easily deformed, which can maintain the close sealing state between the sweeping cover 3 and the opening 03 end face of the cylinder for a long time, avoiding the loosening of the seal and media leakage after long-term use, and greatly improving the reliability of equipment operation. Meanwhile, the lifting eye nut 5 replaces the traditional handwheel locking structure, and is used in conjunction with the vertically fixed locking screw 4 on the cylinder 1. During assembly, simply slip the sweeping cover 3 through the mounting hole of the protrusion 23 onto the locking screw 4, and then tighten the lifting eye nut 5 to complete the clamping and fixing. The alignment is simple and the disassembly and assembly are convenient. The filter assembly can be directly removed and placed from the top opening of the cylinder. Combined with the structural advantage of quick disassembly and assembly of the sweeping cover 3, it is convenient for cleaning and replacing the filter assembly in the later stage. The overall structure layout is compact and reasonable, and the ease of assembly, structural strength and sealing stability are significantly improved. To further explain, the traditional handwheel locking structure is replaced by a lifting eye nut 5. The lifting eye of the lifting eye nut 5 forms a through hole. During on-site operations, conventional tools such as screwdrivers and wrenches can be directly inserted into the lifting eye hole and locked in place. The lifting eye acts as a fulcrum to form a lever arm, effectively extending the rotational force application area. With the help of the lever torque, the lifting eye nut can be easily tightened or loosened without the need for manual tightening. The disassembly and assembly operations are more labor-saving and convenient, and no special tools are required, making it more adaptable to the site. Meanwhile, the integrated lifting ring structure on the lifting nut 5, in addition to its own tightening function, also serves as a load-bearing component for the entire filter unit during lifting. Once the filter is fully assembled, the lifting slings of the hoisting equipment can be directly attached to the lifting ring, allowing for the lifting, transport, and placement of the entire filter. This eliminates the need for additional welding of lifting lugs or other lifting components to the cylinder, simplifying the external structure of the cylinder, reducing processing steps and manufacturing costs, and ensuring stable and reliable lifting force. This greatly facilitates the handling, alignment, and pipeline installation of large cylindrical filters on construction sites. This cylindrical filter integrates the cover 31 and top pressure strip 32 of the sweeping cover 3 into a single unit, abandoning the traditional split structure, reducing the number of parts, and simplifying assembly and maintenance procedures. Simultaneously, it significantly improves the overall structural strength of the sweeping cover 3, making it less prone to deformation under pressure, ensuring a tight seal with the cylinder opening, effectively preventing media leakage, and improving the long-term operational reliability of the equipment.Furthermore, the cylinder 1 is provided with a feed pressure measuring unit 61 and a discharge pressure measuring unit 62. The feed pressure measuring unit 61 is located at the feed inlet 01, and the discharge pressure measuring unit 62 is located at the discharge outlet 02. The feed pressure measuring unit 61 and the discharge pressure measuring unit 62 are respectively communicatively connected to the differential pressure transmitter 63. The feed pressure measuring unit 61 is installed at the feed inlet 01 of the cylinder 1, and the discharge pressure measuring unit 62 is installed at the discharge outlet 02. Both the feed pressure measuring unit 61 and the discharge pressure measuring unit 62 adopt pressure sensors adapted for medium pressure detection. Their detection ends extend into the medium flow channels of the corresponding feed inlet 01 and discharge outlet 02 to ensure accurate acquisition of medium pressure data before and after filtration. Meanwhile, the feed pressure measuring unit 61 and the discharge pressure measuring unit 62 establish stable communication connections with the differential pressure transmitter 63 via signal transmission cables. The differential pressure transmitter 63 can be fixedly installed on the outside of the cylinder 1 for easy observation and maintenance by personnel, without affecting the compactness of the overall filter structure. Specifically, the feed pressure measuring unit 61 detects the initial pressure of the medium entering the filter chamber at the feed inlet 01 in real time, while the discharge pressure measuring unit 62 simultaneously detects the pressure of the medium discharged after filtration by the filter assembly 3 at the discharge outlet 02. Both units transmit the collected real-time pressure signals synchronously to the differential pressure transmitter 63. The differential pressure transmitter 63 performs real-time calculations on the two sets of pressure signals to obtain the difference between the feed pressure and the discharge pressure, and displays and reports the difference data in real time. A reasonable differential pressure threshold can also be preset. When the detected differential pressure exceeds the threshold, the differential pressure transmitter 63 can issue a warning signal to remind personnel to handle the situation promptly. By adding a feed pressure measuring unit 61, a discharge pressure measuring unit 62, and a differential pressure transmitter 63, the shortcomings of existing technologies—such as the inability to monitor the clogging status of the filter assembly 3 in real time and the need for manual judgment based on experience regarding when to clean or replace the filter screen—are resolved. This achieves real-time monitoring and accurate judgment of the filtration status. When the filter screen of the filter assembly 3 is gradually clogged by impurities, the resistance of the medium passing through the filter screen increases, and the pressure difference between the feed inlet and the discharge outlet increases accordingly. Through real-time feedback from the differential pressure transmitter 63, operators can accurately grasp the degree of filter screen clogging, avoiding excessive clogging leading to poor medium flow and reduced filtration efficiency, or the waste of manpower and resources caused by blindly disassembling and cleaning the filter assembly. In addition, the differential pressure sensing monitoring structure in this embodiment has a simple layout and strong modular adaptability. It is not only suitable for the barrel filter of this structure, but can also be widely applied to other types of filtration equipment such as Y-type filters. Only by arranging pressure measuring components at the media inlet and outlet of various filters can real-time monitoring of differential pressure when the filter is clogged be realized. The structure has strong reusability and wide applicability, which effectively improves the versatility and engineering promotion value of the differential pressure sensing structure.Furthermore, the filter assembly 3 includes a filter screen 31, a top support 32, and a bottom support 33. The upper and lower ends of the filter screen 31 are respectively fixed between the top support 32 and the bottom support 33. The top support 32 is elliptical in shape and is positioned directly opposite the feed inlet 01. The filter assembly 3 is composed of the filter screen 31, the top support 32, and the bottom support 33. The filter screen 31 is made of high-strength filter material, and its upper and lower ends are firmly assembled between the top support 32 and the bottom support 33 by welding or bolting, forming an integral filter structure. This ensures that the filter screen 31 will not loosen or fall off under the impact of the medium, thus improving the structural stability of the filter assembly 3. The top support 32 is designed as an elliptical structure, and during assembly, the top support 32 is positioned directly opposite the feed inlet 01 of the cylinder 1. At the same time, the top of the filter assembly 3 is inclined at different heights, with the lower side facing the feed inlet 01 and the higher side facing the discharge outlet 02. This structure allows the medium entering the filter chamber to flow smoothly and evenly along the elliptical top support 32 and the inclined top surface, avoiding concentrated media impact on the filter screen and reducing localized impact losses on the filter screen 31. The inclined arrangement also optimizes the internal flow field distribution, extends the media filtration path, improves filtration uniformity and efficiency, and facilitates the settling of impurities, reducing impurity accumulation and clogging on the feed side filter screen surface. Combined with the differential pressure detection structure, it can maintain a stable flow field and ensure accurate and reliable differential pressure monitoring data. The bottom support 33 corresponds to the bottom contour of the filter chamber inside the cylinder 1, ensuring that the filter assembly 3 can be stably placed after being placed in the filter chamber. Furthermore, the top support 32 is also equipped with a lifting handle 34, which extends upwards. A lifting handle 34 is fixedly mounted on the top support 32 of the filter assembly 3 by welding. The lifting handle 34 extends vertically upward, and its height is slightly lower than the edge of the top opening 03 of the cylinder 1. This ensures that the cleaning cover 2 will not interfere with the lifting handle 34 when it is closed, and also facilitates the operation by the operator. The lifting handle 34 is made of the same high-strength material as the top support 32, and its surface is treated with anti-slip material to improve the stability of the grip and prevent slippage during operation. The lifting handle 34 added in this embodiment effectively solves the problem of inconvenient removal of the existing filter assembly. Compared with the existing technology that requires additional tools to hook and move the filter assembly, this embodiment, by setting the lifting handle 34 on the top support 32, allows the operator to directly hold the lifting handle 34 and easily remove or insert the filter assembly 3 from the top opening 03 of the cylinder 1. The operation is convenient and labor-saving, and the labor intensity of cleaning and replacing the filter assembly 3 is greatly reduced.Meanwhile, the lifting handle 34 is fixed to the top bracket 32, forming an integrated structure with the filter assembly 3. This avoids adding extra parts and does not affect the filtration effect or assembly stability of the filter assembly 3. Combined with the convenient disassembly and assembly structure of the sweeping cover 2 and the pressure monitoring structure mentioned earlier, it further shortens equipment maintenance time, improves maintenance efficiency, and ensures the continuity of filtration operations. Furthermore, the pore size of the filter screen 31 is d, where 0.1mm < d ≤ 30mm. Preferably, the filter of this invention sets the pore size of the filter screen 31 to a range of 0.1mm-1mm. This pore size is smaller than the pore size of conventional filter screens, effectively trapping fine suspended impurities and particles in the medium. Compared to filter screens with ordinary pore sizes, it significantly improves the filtration and purification accuracy of the medium, effectively improving the cleanliness of the discharged medium and adapting to high-precision filtration conditions. Meanwhile, the smaller pore size of the filter screen 31 results in a higher impurity retention density. During use, the filter screen 31 is more prone to impurity adhesion and accumulation, and the change in flow resistance of the medium through the filter screen 31 is more sensitive. With the monitoring structure of the feed pressure measuring unit 31, the discharge pressure measuring unit 62 and the differential pressure transmitter 63, even slight blockage of the filter screen 31 can cause a significant pressure difference change between the feed port 01 and the discharge port 02. The differential pressure transmitter 63 can quickly sense and provide real-time feedback on the blockage status, overcoming the shortcomings of conventional large-pore filter screens where the initial pressure difference change is not obvious and the potential blockage cannot be detected in time. 5 HK 30137920 A Based on the feedback signal from the differential pressure transmitter 63, staff can promptly clean or replace the filter assembly 3. This ensures continuous high-precision filtration while preventing excessive filter clogging that could obstruct media flow and cause abnormal pressure increases within the cylinder 1. Combined with the overall differential pressure detection structure and the convenient disassembly and assembly structure of the filter assembly, this effectively improves the stability and timeliness of filter operation and maintenance. Furthermore, a drain port 04 is provided on the lower side wall of the cylinder 1, and a drain plug is removably installed at the drain port 04. The drain port 04 is located near the bottom on the lower side wall of the cylinder 1 and is connected to the filter chamber inside the cylinder 1 to discharge impurities and wastewater deposited within the filter chamber. A drain plug is removably installed at the drain port 04, and a sealing gasket is placed between the drain plug and the drain port 04 to ensure a tight seal and prevent media leakage from the drain port 04. The drain plug is made of corrosion-resistant material, adapted to the characteristics of the filter media, and extends its service life.Furthermore, the eye nut 5 includes an integrally formed eye portion 51 and a nut portion 52; the eye portion 51 has a through-hole; the nut portion 52 is a cylindrical structure with an internal thread, which is threaded to the locking screw 4. The eye nut 5 is configured as an integrally formed eye portion 51 and nut portion 52, both made of high-strength metal to ensure overall structural strength and prevent breakage or deformation during use. The eye portion 51 has a through-hole, the size of which is suitable for common tools such as screwdrivers and wrenches, facilitating tool insertion; the nut portion 52 is a cylindrical structure with an internal thread, the specification of which matches the external thread of the locking screw 4, ensuring a stable threaded engagement between the eye nut 5 and the locking screw 4, and smooth tightening. This embodiment refines the structure of the eye nut 5, resulting in a more rational and practical overall structure compared to ordinary handwheels or simple eye nuts in the prior art. The one-piece molded eye part 51 and nut part 52 have high structural strength and uniform force distribution, enabling stable downward pressure on the top pressure strip 22 to ensure the sealing and locking effect of the sweeping cover 2. Simultaneously, the through hole of the eye part 51 is compatible with commonly used tools, allowing operators to insert screwdrivers, wrenches, and other tools into the hole and conveniently tighten the eye nut 5 using leverage torque. Compared to traditional handwheel tightening, this is more labor-saving and efficient, especially suitable for scenarios requiring significant tightening force, solving the problems of laborious and inconvenient operation associated with existing handwheel tightening. Furthermore, the nut 52 adopts a cylindrical structure, which makes the fit with the locking screw 4 tighter, resulting in good locking stability after tightening and preventing loosening. This further improves the sealing reliability of the sweeping cover 2. Together with the integrally formed structure of the sweeping cover 2, it further optimizes the ease of locking operation and structural stability of the filter. Moreover, the inner wall of the cylinder 1 is provided with a raised ring 11, which extends circumferentially along the inner wall of the cylinder 1. When the filter assembly 3 is placed in the filter chamber, the top surface of the raised ring 11 abuts against the lower surface of the top support 32, and the raised ring 11 is used to limit the top of the filter assembly 3. The raised ring 11 is integrally formed with the cylinder 1 and extends circumferentially along the inner wall of the cylinder 1. The top surface of the raised ring 11 remains flat, and its height is adapted to the installation position of the top support 32 of the filter assembly 3. When the filter assembly 3 is placed into the filter chamber through the opening 03 at the top of the cylinder 1, the lower surface of the top support 32 of the filter assembly 3 is in close contact with the top surface of the convex ring 11, and the convex ring 11 provides limiting support for the top of the filter assembly 3.The convex ring 11 effectively solves the problems of inaccurate positioning and easy shaking of the existing filter assembly 3 after it is placed in the filter chamber. Compared with the existing technology where the filter assembly 3 is placed directly at the bottom of the filter chamber without top limiting, the convex ring 11 can accurately limit the top of the filter assembly 3, ensuring the stability of the filter assembly 3 in the filter chamber and avoiding the impact force generated during media flow that causes the filter assembly 3 to shake or shift. This also prevents the filter screen 31 from rubbing or colliding with the inner wall of the cylinder 1, extending the service life of the filter screen 31 and the cylinder 1. At the same time, the convex ring 11 is integrally formed with the cylinder 1, with high structural strength and is not easily deformed. It can play a stable limiting role for a long time without affecting the removal and placement of the filter assembly 3. When it is necessary to remove the filter assembly 3, simply pull the lifting handle 34 upwards to disengage the top support 32 from the limiting of the convex ring 11, making the operation convenient. Furthermore, the bottom of the inner wall of the cylinder 1 is provided with several limiting protrusions 12, which are evenly spaced along the inner wall of the cylinder 1. When the filter assembly 3 is placed in the filter chamber, the top surface of the limiting protrusions 12 abuts against the bottom of the filter assembly 3, and the limiting protrusions 12 are used to support and limit the bottom of the filter assembly 3. Several limiting protrusions 12 are evenly spaced on the bottom of the inner wall of the cylinder 1. The limiting protrusions 12 are integrally formed with the cylinder 1, adopt a high-strength structural design, and their top surfaces remain flat, with the top surfaces of all limiting protrusions 12 at the same horizontal plane. When the filter assembly 3 is placed in the filter chamber, the bottom surface of the filter assembly 3 abuts tightly against the top surfaces of all the limiting protrusions 12, and the limiting protrusions 12 provide uniform support and limitation for the bottom of the filter assembly 3. By setting the limiting protrusions 12, which work in conjunction with the protruding rings 11, the filter assembly 3 is bidirectionally limited in both directions, further improving its stability within the filter chamber. This prevents the filter assembly 3 from shaking or shifting under media impact, ensuring that the filter screen 31 is always in the optimal filtration position and improving filtration efficiency. Simultaneously, the limiting protrusions 12 are evenly spaced along the inner wall of the cylinder 1, ensuring uniform force distribution on the bottom of the filter assembly 3. This prevents excessive localized force from deforming or damaging the bottom support 33, extending the service life of the filter assembly 3. Furthermore, a sealing gasket is embedded inside the cover 21 of the sweeping cover 2. When the sweeping cover 2 is closed over the top opening 03 of the cylinder 1, the sealing gasket is pressed between the end face of the cover 21 and the end face of the cylinder 1.An annular groove is provided at the bottom of the cover body 21 of the cleaning cover 2. The size of the annular groove is adapted to the contour of the end face of the top opening 03 of the cylinder 1. An elastic sealing gasket is embedded in the annular groove. The sealing gasket is made of corrosion-resistant and high-temperature resistant rubber or silicone. When the cleaning cover 2 is mounted on the top of the cylinder 1 by the top pressure strip 22 and the lifting nut 5 is tightened, the end face of the cover body 21 is tightly fitted with the top end face of the cylinder 1, and the sealing gasket is pressed between the two, forming a reliable end face seal. By adding a sealing gasket, the problem of poor sealing effect and easy media leakage of existing cleaning covers is effectively solved. Compared with the existing technology that only relies on the fit between the cover body and the end face of the cylinder for sealing, the elastic sealing gasket can fill the small gap between the end face of the cover body 21 and the end face of the cylinder 1, improve the sealing reliability, prevent the media from leaking from the fit surface, and ensure the normal operation of the equipment. The technical principle of this utility model has been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this invention and should not be construed as limiting the scope of protection of this invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this invention without any inventive effort, and these embodiments will all fall within the scope of protection of this invention. 7 HK 30137920 A Claim 1. A barrel-type filter, characterized in that: it comprises a barrel body, a sweeping cover, a filter assembly, a locking screw, and a lifting eye nut; the interior of the barrel body is a filter chamber, and the barrel body has an inlet and an outlet on both sides, and an opening at the top of the barrel body, through which the filter assembly is placed into the filter chamber; at least two locking screws are provided at the top of the barrel body, and the locking screws extend vertically; the sweeping cover is integrally formed from a cover body and a top pressure strip, and the two ends of the top pressure strip extend to the outside of the cover body and form two protrusions, the protrusions having through mounting holes; the locking screws are correspondingly vertically inserted into the mounting holes, so that the sweeping cover is mounted on the top of the barrel body through the top pressure strip; the lifting eye nut is threadedly fitted to the locking screw and located above the top pressure strip, and the lifting eye nut is used to press the top pressure strip downward. 2. A barrel-type filter according to claim 1, characterized in that: the barrel body is provided with a feed pressure measuring part and a discharge pressure measuring part, the feed pressure measuring part is located at the feed inlet, the discharge pressure measuring part is located at the discharge outlet, and the feed pressure measuring part and the discharge pressure measuring part are respectively communicatively connected to a differential pressure transmitter. 3. A barrel-type filter according to claim 2, characterized in that: the filter assembly includes a filter screen, a top support, and a bottom support, the upper and lower ends of the filter screen are respectively fixed between the top support and the bottom support; the top support is elliptical in shape and is positioned directly opposite the feed inlet.4. A barrel-type filter according to claim 3, characterized in that: the top support is further provided with a lifting handle, the lifting handle extending upward. 5. A barrel-type filter according to claim 4, characterized in that: the pore size of the filter screen is d, wherein 0.1mm < d ≤ 30mm. 6. A barrel-type filter according to claim 1, characterized in that: a drain port is provided on the lower side wall of the barrel, and a drain plug is detachably installed at the drain port. 7. A barrel-type filter according to claim 1, characterized in that: the lifting ring nut includes an integrally formed lifting ring portion and a nut portion; a through-hole is formed inside the lifting ring portion; the nut portion has a cylindrical structure, and an internal thread is provided inside the nut portion, the internal thread of the nut portion being screwed into the locking screw thread. 8. A barrel-type filter according to claim 4, characterized in that: a raised ring is provided on the inner wall of the barrel, the raised ring extending circumferentially along the inner wall of the barrel; when the filter assembly is placed in the filter chamber, the top surface of the raised ring abuts against the lower surface of the top support, the raised ring being used to limit the top of the filter assembly. 9. A barrel-type filter according to claim 8, characterized in that: a plurality of limiting protrusions are further provided at the bottom of the inner wall of the barrel, the limiting protrusions being evenly spaced along the inner wall of the barrel; when the filter assembly is placed in the filter chamber, the top surface of the limiting protrusions abuts against the bottom of the filter assembly, the limiting protrusions being used to support and limit the bottom of the filter assembly. 10. A barrel-type filter according to claim 1, characterized in that: a sealing gasket is embedded inside the cover of the cleaning cover, and when the cleaning cover is closed to the top opening of the barrel, the sealing gasket is pressed between the end face of the cover and the end face of the barrel. HK 30137920 A 1 Instruction Manual Attachments Figure 1 1 HK 30137920 A Figure 2 2 HK 30137920 A Figure 3 3 HK 30137920 A Figure 4 4 ​​HK 30137920 A Figure 5 5 HK 30137920 A Figure 6 6 HK 30137920 A Figure 7 7 HK 30137920 A Figure 8 8 HK 30137920 A.

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