Oily sludge drying treatment method and system

Abstract

The invention relates to the technical field of solid waste pollution treatment, in particular to an oily sludge drying treatment method and system.The oily sludge drying treatment system comprises a rack, two filter belts, a plurality of extrusion rollers and a plurality of chain plates, the two filter belts form a closed conveying loop on the rack, and part of the two filter belts abut against each other; the abutted part of the two filter belts is used for clamping and transporting oily sludge; the plurality of extrusion rollers are rotationally arranged on the rack; the abutting part of the two filter belts sequentially bypasses a plurality of extrusion rollers, and the extrusion rollers are used for extruding the abutting part of the two filter belts, so that the clamped oily sludge forms a filter cake; the plurality of chain plates form a chain type structure, and a closed motion loop is formed on the rack and is positioned at an outlet of an abutting part of the two filter belts; each chain plate is provided with a scraper, the scrapers face the filter belt, abut against the outer belt face of the filter belt and are used for scraping filter cakes, the moving tracks of the scrapers extend in the belt width direction of the filter belt, and therefore it is guaranteed that the abrasion degrees of all the scrapers tend to be consistent.

Description

Technical Field

[0001] This invention relates to the field of solid waste pollution treatment technology, and in particular to a method and system for drying oily sludge. Background Technology

[0002] Solid waste refers to waste materials with a certain volume and mass generated during production, daily life, construction, and other activities. If not properly handled, solid waste can cause long-term and cumulative harm to soil, water bodies, the atmosphere, and ecosystems.

[0003] Oily sludge, a common type of solid waste, can cause a series of serious environmental and safety problems if it is directly dumped or landfilled without proper treatment. During the dumping or landfilling process, leachate is easily generated inside the sludge, which can pollute groundwater once it seeps into the ground. At the same time, it can also damage the structure and function of the surrounding soil, leading to a decline in soil quality. In addition, oily sludge can release volatile organic compounds and even produce harmful gases such as hydrogen sulfide. These substances not only damage the surrounding ecological environment but also pose a threat to human health and production safety. Therefore, it is of great significance to effectively treat oily sludge before discharging it.

[0004] Drying is a key step in the treatment of oily sludge. Its core principle is to evaporate the water in the oily sludge to significantly reduce the water content of the sludge, thereby significantly reducing the volume and mass of the sludge and creating convenient conditions for subsequent transportation, storage and final disposal.

[0005] In the drying process of oily sludge, the drying device is an important piece of equipment to achieve this treatment goal. Related technologies, such as Chinese patent CN111348815B, disclose a sludge dewatering and drying device. This device mainly uses filter cloth to transport the sludge. During the transport process, the sludge is sandwiched and transported by two layers of filter cloth, and then squeezed and dewatered at the sliding rollers. After repeated squeezing and dewatering by multiple sliding rollers, the sludge reaches the outlet end and then detaches from the filter cloth. To ensure sufficient detachment, two layers of filter cloth scrapers are installed at the outlet end. The two layers of filter cloth scrapers are pressed against the outer walls of the two layers of filter cloth, and as the filter cloth rotates, the sludge is scraped off by the filter cloth scrapers.

[0006] However, when the aforementioned sludge dewatering and drying device processes oily sludge, the varying thickness of the oily sludge along the width of the filter cloth causes differences in the compressive force and the uniformity of water evaporation in areas of different thicknesses as the oily sludge passes through the filter cloth and is squeezed and dewatered by the sliding rollers. This results in varying degrees of bonding between the filter cake and the filter cloth, leading to inconsistent wear along the width of the filter cloth when the scraper removes the filter plate. Consequently, this not only shortens the service life of the scraper but may also result in incomplete scraping in some areas, leaving filter cake residue and affecting the overall processing effect and operational stability of the device. Summary of the Invention

[0007] Therefore, it is necessary to provide a method and system for drying oily sludge to address the problems of short scraper life and incomplete scraping in current sludge dewatering and drying devices.

[0008] The above objectives are achieved through the following technical solutions: An oily sludge drying system, the oily sludge drying system comprising: frame; The two filter belts each form a closed transport loop on the frame and are partially in contact; the contact portion of the two filter belts is configured to enclose and transport oily sludge. Multiple extrusion rollers are mounted on the frame and are all capable of rotating about their own axis; the portion of the two filter belts that abuts passes over the multiple extrusion rollers in sequence, and the extrusion rollers are configured to extrude the portion of the two filter belts that abuts, so that the oily sludge being enclosed forms a filter cake; Multiple chain plates form a chain structure and a closed motion loop on the frame, located at the outlet of the abutment portion of the two filter belts. The chain structure moves periodically. Each chain plate is provided with a scraper, which is inclined toward the filter belt and abuts against the outer surface of the filter belt, and is configured to scrape off the filter cake. The movement trajectory of the scraper extends along the bandwidth direction of the filter belt.

[0009] Furthermore, the frame is provided with a plurality of cutting sections, which are arranged at intervals along the width direction of the filter belt and are all located at the outlet of the abutment portion of the two filter belts and behind the scraper. The cutting sections are configured to cut the filter cake along the length direction of the filter belt.

[0010] Furthermore, the cutting part can slide elastically along the length direction of the filter belt; the scraper can slide elastically along its own extension direction; the oily sludge drying treatment system also includes an adjustment module, which is configured to adjust the contact pressure between the scraper and the filter belt according to the scraping resistance of the filter cake, and the greater the scraping resistance of the filter cake, the greater the contact pressure between the scraper and the filter belt.

[0011] Furthermore, the adjustment module includes multiple stops and multiple adjustment ropes. The multiple stops are arranged at intervals along the bandwidth direction of the filter belt and are all located at the outlet of the contact portion of the two filter belts. The stops can slide in a direction parallel to the extension direction of the scraper and can form a stop engagement with the scraper. The adjustment ropes are connected between the stops and the cutting section.

[0012] Furthermore, a first elastic element is connected between each of the cutting sections and the frame.

[0013] Furthermore, a second elastic element is connected between each of the scrapers and the chain plate.

[0014] Furthermore, the oily sludge drying system also includes a first drive module configured to provide driving force for the operation of one of the filter belts.

[0015] Furthermore, the oily sludge drying system also includes a second drive module configured to provide another drive force for the operation of the filter belt.

[0016] Furthermore, the oily sludge drying system also includes a third drive module, which is configured to provide the driving force for the operation of the chain structure.

[0017] This invention also provides a method for drying oily sludge, employing an oily sludge drying system, the method comprising the following steps: S1. Operate the filter belt and chain structure, and make the chain structure move periodically. When the chain structure moves, it synchronously drives the scraper to move, and the movement trajectory of the scraper extends along the bandwidth direction of the filter belt. S2. The oily sludge is placed on the filter belt located above. The oily sludge is then transported by being sandwiched between the two filter belts and squeezed by the squeeze rollers to achieve dewatering. It then moves to the outlet of the two filter belts and is scraped off by the scraper as the filter belt rotates.

[0018] The beneficial effects of this invention are: This invention relates to a method and system for drying oily sludge. By setting up scrapers and matching chain plates, and utilizing the periodic motion characteristics of the chain plates, the scrapers not only move but also extend their movement trajectory along the width of the filter belt. This ensures that each scraper can contact filter cakes of different thicknesses along the width of the filter belt, thereby effectively extending the service life of each scraper and removing as much filter cake as possible. This reduces filter cake residue while improving the overall treatment effect and operational stability of the system.

[0019] Furthermore, by setting multiple cutting sections and utilizing their positional and cutting characteristics, the filter cake is cut into several strips before it comes into contact with the scraper. This not only effectively reduces the overall scraping resistance of the filter cake, but also allows air to enter the interface between a single filter cake and the filter belt, which helps to reduce the degree of adsorption and binding between the two, thereby effectively reducing the scraping resistance of a single filter cake and improving the scraping efficiency.

[0020] Furthermore, by setting an adjustment module and designing the cutting section and scraper to have corresponding motion characteristics, the contact pressure between the scraper and the filter belt can be adjusted according to the scraping resistance of the filter cake. Thus, when the scraping resistance of the filter cake increases, the contact pressure between the scraper and the filter belt is increased to increase the scraping force and ensure the scraping effect. When the scraping resistance of the filter cake decreases, the contact pressure between the scraper and the filter belt is decreased to reduce the scraping force and reduce unnecessary wear. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the oily sludge drying treatment system provided in an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of the structure at point A in the middle; Figure 3 This is a side view of the oily sludge drying treatment system provided in an embodiment of the present invention. Figure 4 for Figure 3 A magnified schematic diagram of the structure at point B in the middle; Figure 5 This is a three-dimensional cross-sectional view of the oily sludge drying treatment system provided in an embodiment of the present invention. Figure 6 for Figure 5 A magnified schematic diagram of the structure at point C in the middle; Figure 7 for Figure 5 A magnified schematic diagram of the structure at point D in the middle; Figure 8 for Figure 5 A magnified schematic diagram of the structure at point E in the middle; Figure 9An exploded view of some structural components of the oily sludge drying treatment system provided in an embodiment of the present invention; Figure 10 This is a three-dimensional structural diagram of a partial structure of the oily sludge drying treatment system provided in an embodiment of the present invention.

[0022] in: 1. Frame; 101. Crossbar; 102. First reversing ring; 103. Second reversing ring; 104. Third reversing ring; 105. Fourth reversing ring; 2. Filter belt; 201. Inlet; 202. Outlet; 3. Extrusion rollers; 401. First rotating roller; 501. Second rotating roller; 6. Chain plate; 601. Slide groove; 602. Second spring; 7. Scraper; 701. Slider; 801. Third drive motor; 802. Follower roller; 803. Gear; 804. Rack; 9. Cutting section; 901. Connecting rod; 902. Retaining ring; 903. First spring; 904. Second connecting ring; 10. Adjustment module; 1001. Stop block; 10011. First connecting ring; 1002. Adjustment rope. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] The module numbers used in this document, such as "first" and "second," are merely for distinguishing the described objects and have no sequential or technical meaning. The terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] The following reference Figures 1 to 10 The present invention describes an oily sludge drying system provided in the embodiments of the present invention, which is particularly suitable for drying oily sludge, and of course, it is also suitable for drying other types of sludge.

[0027] Specifically, the oily sludge drying system includes a frame 1; two filter belts 2 are installed on the frame 1. The filter belts 2 are ring-shaped, horizontally arranged, and extend in the front-to-back direction. The filter belts 2 form a closed transport loop on the frame 1. The two filter belts 2 are arranged in the vertical direction, with the upper filter belt 2 extending along... Figure 3 The filter belt 2, located below, rotates counterclockwise. Figure 3 The filter belt 2 rotates clockwise, and the lower layer of the upper filter belt 2 and the upper layer of the lower filter belt 2 abut against each other. During the operation of the filter belt 2, in coordination with the rotation direction of the filter belt 2, the abutting part of the two filter belts 2 can enclose and transport oily sludge from back to front. An inlet 201 is formed between the lower rear side of the upper filter belt 2 and the upper rear side of the lower filter belt 2, and the oily sludge can enter between the lower layer of the upper filter belt 2 and the upper layer of the lower filter belt 2 from the inlet 201.

[0028] The frame 1 is also equipped with multiple extrusion rollers 3. The extrusion rollers 3 are horizontally arranged and extend in the left-right direction, and are positioned between the upper layer of the filter belt 2 located above and the lower layer of the filter belt 2 located below. The extrusion rollers 3 can rotate around their own axis, and the multiple extrusion rollers 3 are arranged alternately in the vertical direction from back to front. The part where the two filter belts 2 abut together passes around the multiple extrusion rollers 3 in sequence to form an S-shaped structure. The extrusion rollers 3 are used to squeeze the part where the two filter belts 2 abut together from the inside to the outside, so that the oily sludge trapped inside forms a filter cake. An outlet 202 is formed between the lower front side of the lower layer of the filter belt 2 located above and the upper front side of the upper layer of the filter belt 2 located below, and the filter cake is discharged at the outlet 202.

[0029] The frame 1 is also equipped with two scraper blades. The scraper blades are strip-shaped, horizontally arranged, and extend in the left and right direction. Both scraper blades are located at the outlet 202 and are arranged in the up and down direction. The upper scraper blade abuts against the lower belt of the upper filter belt 2 and is used to scrape off the filter cake adhering to the upper filter belt 2. The lower scraper blade abuts against the upper belt of the lower filter belt 2 and is used to scrape off the filter cake adhering to the lower filter belt 2.

[0030] To facilitate the driving force for the operation of the filter belt 2 located above, the oily sludge drying treatment system is configured to also include a first drive module. The first drive module includes a first drive motor and multiple first rotating rollers 401. The first rotating rollers 401 are horizontally arranged and extend in the left-right direction. The multiple first rotating rollers 401 are all arranged on the inner side of the filter belt 2 located above, and all are in frictional contact with the inner belt surface of the filter belt 2 located above, and together with multiple extrusion rollers 3, they form an annular shape to facilitate the support of the filter belt 2 located above. The first drive motor is configured to drive one of the first rotating rollers 401 to rotate, thereby forming a closed transport loop for the filter belt 2 located above through the follow-up movement of the other first rotating rollers 401 and extrusion rollers 3.

[0031] To facilitate the driving force for the operation of the filter belt 2 located below, the oily sludge drying treatment system is configured to also include a second drive module. The second drive module includes a second drive motor and multiple second rotating rollers 501. The second rotating rollers 501 are horizontally arranged and extend in the left-right direction. The multiple second rotating rollers 501 are all arranged on the inner side of the filter belt 2 located below, and all are in frictional contact with the inner belt surface of the filter belt 2 located below, and together with multiple extrusion rollers 3, they form an annular shape to facilitate the support of the filter belt 2 located below. The second drive motor is configured to drive one of the second rotating rollers 501 to rotate, thereby forming a closed transport loop for the filter belt 2 located below through the follow-up movement of the other second rotating rollers 501 and extrusion rollers 3.

[0032] During use, the first drive motor and the second drive motor are started first. The first drive motor drives one of the first rotating rollers 401 to rotate, and through the follow-up movement of the other first rotating rollers 401 and the squeeze roller 3, the filter belt 2 located above is moved along... Figure 3 A closed transport loop is formed in the counterclockwise direction; the second drive motor drives one of the second rotating rollers 501 to rotate, and through the follow-up movement of the other second rotating rollers 501 and the squeeze roller 3, the filter belt 2 located below moves along... Figure 3 A closed transport loop is formed in the clockwise direction.

[0033] Then, the oily sludge is placed on the outer surface of the upper belt of the upper filter belt 2. The oily sludge gradually spreads evenly on the outer surface of the upper belt of the upper filter belt 2. As the upper filter belt 2 rotates, the oily sludge moves from front to back and then falls onto the outer surface of the upper belt of the lower filter belt 2. As the lower filter belt 2 rotates, the oily sludge moves from back to front, and then enters from inlet 201 between the lower belt of the upper filter belt 2 and the upper belt of the lower filter belt 2. The filter sludge is then sandwiched between the lower layer of the upper filter belt 2 and the upper layer of the lower filter belt 2 and moves from back to front. When the oily sludge passes through the extrusion roller 3, it is gradually dehydrated and forms a filter cake under the extrusion action of the extrusion roller 3. The filter cake is then discharged from the outlet 202. As the upper filter belt 2 rotates, the filter cake adhering to the upper filter belt 2 is scraped off by the upper scraper. As the lower filter belt 2 rotates, the filter cake adhering to the lower filter belt 2 is scraped off by the lower scraper.

[0034] Although the above process can achieve the drying treatment of oily sludge, due to the different thicknesses of the oily sludge in the width direction of the filter belt 2, the thicker areas of oily sludge may still have more moisture remaining after compression, resulting in a relatively larger contact area and adhesion between the filter cake and the surface of the filter belt 2; while the thinner areas of oily sludge may be dewatered more thoroughly, and the bonding force between the filter cake and the filter belt 2 is relatively weak.

[0035] When the scraper blade removes the filter cake adhering to the filter belt 2, the scraper blade needs to apply a greater force to remove the filter cake in areas where the filter cake and filter belt 2 are strongly bonded. This results in greater friction on the scraper blade in these areas. Conversely, in areas where the filter cake and filter belt 2 are weakly bonded, the scraper blade needs to apply a smaller force, and the friction is relatively smaller.

[0036] Over long-term operation, the wear rate of the scraper blade along the width of the filter belt 2 will be significantly faster in areas with high friction than in areas with low friction. This will eventually lead to inconsistent wear across different parts of the scraper blade along the width of the filter belt 2. This inconsistent wear will not only shorten the service life of the scraper blade, but may also result in incomplete scraping in some areas, leaving filter cake residue and affecting the overall processing efficiency and operational stability of the system.

[0037] Based on this, in the oily sludge drying system provided in this embodiment of the invention, a combination of chain plates 6 and scrapers 7 is used to replace the scraper blades. Specifically, there are multiple chain plates 6, all of which are mounted on the frame 1 and form a ring shape. Adjacent chain plates 6 are hinged together to form a chain structure. The chain structure is horizontally arranged and extends in the left-right direction, located at the outlet 202. Each chain plate 6 is equipped with a scraper blade 7. The scraper blade 7 on the upper chain plate 6 of the chain structure coincides with the scraper blade located above it, and the scraper blade 7 on the lower chain plate 6 of the chain structure coincides with the scraper blade located below it. The scraper blade 7 extends obliquely in the rear-upward direction. The chain structure facilitates contact with the outer surface of the filter belt 2, allowing it to scrape away filter cake adhering to the filter belt 2 during operation, in accordance with the belt's rotation direction. A closed motion loop is formed on the frame 1, and the chain structure's periodic movement ensures effective scraping. The chain structure's movement synchronously drives the scraper 7, extending its trajectory along the width of the filter belt 2. This allows each scraper 7 to alternately contact filter cakes of varying thicknesses along the width, resulting in a more even distribution of scraping resistance across each scraper 7, preventing prolonged high-intensity wear on any single area and extending the overall lifespan of the scraper 7. Furthermore, since the scraper 7 can traverse the entire width direction, even areas with strong filter cake adhesion can be effectively scraped away through the dynamic coverage of the scraper 7, significantly reducing filter cake residue. Ultimately, while ensuring effective scraping, the risk of failure due to localized wear of the scraper 7 is reduced, improving the system's stability and continuous processing capability.

[0038] To facilitate the driving force for the operation of the chain structure, the oily sludge drying system also includes a third drive module. The third drive module includes a third drive motor 801 and two follower rollers 802. The two follower rollers 802 are both mounted on the frame 1 and located inside the chain structure, and are arranged at intervals along the front-back direction. The follower rollers 802 are arranged parallel to the scraper 7 and are in frictional contact with the inner plate surface of the chain plate 6 to facilitate support of the chain structure. The cross-sectional shape of the follower rollers 802 can be set to circular. The third drive motor 801 is mounted on the frame 1. A gear 803 is fixedly sleeved on the motor shaft of the third drive motor 801. A rack 804 is provided on the outer plate surface of each chain plate 6. The rack 804 can mesh with the gear 803 to facilitate the formation of a closed motion loop in the chain structure.

[0039] In a further embodiment, when the scraper 7 contacts the filter cake, it is in overall contact. This contact means that the scraper 7 and the filter cake form a continuous contact surface in the width direction of the filter belt 2. As a result, the scraper 7 needs to apply scraping force to all the filter cake within the width range of the filter belt 2 at the same time. Consequently, the scraping force is concentrated in the contact area between the scraper 7 and the filter cake, directly forming a large overall scraping resistance.

[0040] Meanwhile, the filter cake formed by extrusion has a certain adsorption bond with the surface of the filter belt 2, and the filter cake itself has a certain structural integrity. When the scraper 7 comes into full contact with the filter cake, it not only has to overcome the adsorption force between the filter cake and the filter belt 2, but also needs to break the structural integrity of the filter cake itself to achieve peeling. At this time, the adsorption force between the filter cake and the filter belt 2 will be transmitted to the scraper 7 through continuous contact surfaces, and the integrity of the filter cake structure will further enhance the transmission effect of this resistance, so that the resistance that the scraper 7 needs to bear will be further superimposed.

[0041] Based on this, in the oily sludge drying system provided in this embodiment of the invention, a plurality of cutting sections 9 are provided on the frame 1. The plurality of cutting sections 9 are arranged at intervals along the width direction of the filter belt 2 and are all located at the outlet 202 and behind the scraper 7. The cutting section 9 is configured as a triangular pyramid structure with the tip facing the outlet 202, and one of the cone sidewalls coincides with the outer wall of the filter belt 2, which facilitates cutting the filter cake along the length direction of the filter belt 2. Thus, before the filter cake comes into contact with the scraper 7, the filter cake can be cut into several strips. At this time, the overall structure of the filter cake is destroyed, and the scraper 7 no longer needs to resist the overall structural toughness of the filter cake. Instead, it applies force to the individual strips separately. The scraping force is distributed to each individual filter cake, which greatly reduces the overall scraping resistance that the scraper 7 needs to bear and avoids scraping jamming caused by concentrated resistance.

[0042] Simultaneously, gaps are formed between adjacent filter cake strips, allowing air to enter the interface between the individual filter cake and filter belt 2. This air intrusion disrupts the sealed adsorption environment at the interface, weakening the intermolecular forces and negative pressure adsorption effect between the filter cake and filter belt 2, thereby reducing the degree of adsorption and binding between the individual filter cake and filter belt 2. When the scraper 7 subsequently contacts the individual filter cake, it only needs to overcome the lower adsorption resistance to achieve peeling, further reducing the difficulty of scraping the individual filter cake. Ultimately, the combined effect of reduced overall resistance and local adsorption force significantly improves the filter cake scraping efficiency.

[0043] In other embodiments, along the width direction of the filter belt 2, the required scraping force varies due to the inconsistent bonding between the filter cake of different thicknesses and the filter belt 2. When the bonding between the filter cake and the filter belt 2 is weak, the contact force between the scraper 7 and the filter belt 2 is relatively large, resulting in a relatively large scraping force and easy unnecessary wear. Conversely, when the bonding between the filter cake and the filter belt 2 is strong, the contact force between the scraper 7 and the filter belt 2 is relatively small, resulting in a relatively small scraping force and easy incomplete scraping.

[0044] Based on this, in the oily sludge drying system provided in this embodiment of the invention, the cutting part 9 is configured to slide elastically along the length direction of the filter belt 2; the scraper 7 is configured to slide elastically along its own extension direction; the oily sludge drying system also includes an adjustment module 10, which is configured to adjust the contact pressure between the scraper 7 and the filter belt 2 according to the scraping resistance of the filter cake, and the greater the scraping resistance of the filter cake, the greater the contact pressure between the scraper 7 and the filter belt 2.

[0045] Thus, when the scraping resistance of the filter cake increases, the adjusting module 10 increases the contact pressure between the scraper 7 and the filter belt 2, thereby increasing the scraping force and ensuring the scraping effect. When the scraping resistance of the filter cake decreases, the adjusting module 10 decreases the contact pressure between the scraper 7 and the filter belt 2, thereby decreasing the scraping force and reducing unnecessary wear.

[0046] Specifically, to facilitate the elastic sliding of the cutting section 9, a horizontal bar 101 is provided on the frame 1. The horizontal bar 101 is horizontally positioned and extends in the left-right direction, located at the outlet 202. A connecting rod 901 is provided on the cutting section 9. The connecting rod 901 extends along the length of the filter belt 2 and slides through the horizontal bar 101, and can slide along the length of the filter belt 2. A retaining ring 902 is fixedly sleeved on the connecting rod 901, and the retaining ring 902 is located between the cutting section 9 and the horizontal bar 101. A first elastic element is connected between each cutting section 9 and the frame 1. The first elastic element can be set as a first spring 903. The first spring 903 is sleeved on the connecting rod 901, and its two ends abut against the retaining ring 902 and the horizontal bar 101, respectively. Under the action of the first spring 903, the cutting section 9 can elastically slide along the length of the filter belt 2.

[0047] To facilitate the elastic sliding of the scraper 7, a cavity is provided inside each chain plate 6, extending through the top of the chain plate 6; the scraper 7 is slidably inserted into the cavity; a groove 601 is provided on the outer surface of each chain plate 6, the groove 601 communicates with the cavity and extends in a direction parallel to the extension direction of the scraper 7; a slider 701 is vertically provided on the outer wall of each scraper 7 near the bottom, the slider 701 has a T-shaped structure, and the small end is slidably inserted into the groove 601; a second elastic element is connected between each scraper 7 and the chain plate 6, the second elastic element can be set as a second spring 602, the second spring 602 is inserted into the groove 601 and connected between the top of the groove 601 and the slider 701, under the action of the second spring 602, the scraper 7 can elastically slide along its own extension direction.

[0048] The adjustment module 10 is configured to include multiple stops 1001 and multiple adjustment ropes 1002. The multiple stops 1001 are arranged at intervals along the width direction of the filter belt 2 and are all located at the outlet 202 of the abutment part of the two filter belts 2. The stops 1001 are located in front of the lower part of the cutting part 9 and can slide in a direction parallel to the extension direction of the scraper 7, and can push against the bottom of the slider 701 to form a stop with the scraper 7. Each stop 1001 has a first connecting ring 10011 on its top; each connecting rod 901 has a second connecting ring 904 at its front end; the top of the crossbar 101 has multiple first reversing rings 102, which are arranged at intervals along the extension direction of the crossbar 101 and are corresponding to the cutting part 9. The axis of the first reversing rings 102 extends horizontally in the left and right direction; both ends of the crossbar 101 are provided with The frame 1 is provided with multiple second reversing rings 103, which are arranged at intervals along the extension direction of the crossbar 101. The second reversing rings 103 are located in front of the first reversing ring 102, and their axes extend horizontally in the front-back direction. The frame 1 is also provided with multiple third reversing rings 104, which are correspondingly arranged with the second reversing rings 103. The third reversing rings 104 are located between the second reversing rings 103 and the stop block 1001 in the vertical direction and between the second reversing rings 103 and the stop block 1001 in the front-back direction. The axes of the third reversing rings 104 extend horizontally in the front-back direction. The frame 1 is also provided with multiple fourth reversing rings 105, which are located at the same horizontal height as the third reversing rings 104 and are located in front of the third reversing rings 104. They are correspondingly arranged with the stop block 1001. The axes of the fourth reversing rings 105 extend horizontally in the left-right direction.

[0049] The adjusting rope 1002 is connected to a first reversing ring 102, a second reversing ring 103, a third reversing ring 104, and a fourth reversing ring 105 during installation. One end of the adjusting rope 1002 is fixed to the second connecting ring 904, and the other end is closer to the left or right end of the crossbar 101 when the second connecting ring 904 is connected to it. Taking the second connecting ring 904 connected to one end of the adjusting rope 1002 as the leftmost example, the other end of the adjusting rope 1002 extends in the rear-up direction to the first first reversing ring 102 from left to right, and then changes direction after passing through the first first reversing ring 102 from left to right, and then extends in the left-front direction. The direction extends to the first second reversing ring 103 from right to left, then after reversing through the first second reversing ring 103 from right to left, it passes through the first third reversing ring 104 from right to left in the downward-forward direction, and after reversing through the first third reversing ring 104 from right to left, it extends to the first fourth reversing ring 105 from left to right in the right-rear direction, and after reversing through the first fourth reversing ring 105 from left to right, it extends to the first first connecting ring 10011 from left to right in the downward-forward direction, and is fixed to the first first connecting ring 10011 from left to right; the connection method of other adjusting ropes 1002 is the same, and will not be described again.

[0050] During use, the greater the scraping resistance of the strip-shaped filter cake cut by the cutting part 9, the farther it can push the cutting part 9 forward, and the first spring 903 is compressed. When the cutting part 9 moves, it simultaneously pulls the adjusting rope 1002 through the second connecting ring 904. The adjusting rope 1002 simultaneously pulls the stop block 1001. The stop block 1001 moves upward and simultaneously drives the scraper 7 to move upward through the stop cooperation between it and the slider 701, thereby increasing the contact pressure between the scraper 7 and the filter belt 2, increasing the scraping force, ensuring the scraping effect, and the second spring 602 is compressed.

[0051] Conversely, the smaller the scraping resistance of the strip-shaped filter cake cut by the cutting part 9, the more the first spring 903 is released, and the further the cutting part 9 moves backward through the retaining ring 902. When the cutting part 9 moves, the adjusting rope 1002 is released through the second connecting ring 904, the second spring 602 is released, and the scraper 7 moves downward, which reduces the contact pressure between the scraper 7 and the filter belt 2, reduces the scraping force, and reduces unnecessary wear. At the same time, the scraper 7 drives the retaining block 1001 to move downward through the slider 701, ensuring that the adjusting rope 1002 is always in a taut state, thereby ensuring the adjustment performance of the adjusting module 10.

[0052] In other embodiments, to prevent the scraped filter cake from entering between adjacent chain plates 6 and affecting the hinge connection between adjacent chain plates 6, two hook portions are provided on the inner plate surface of the chain plate 6. The hook portions are strip-shaped structures and extend in a direction parallel to the extension direction of the chain plate 6. The two hook portions are located on both sides and the hook ends are arranged opposite each other, so that the scraped filter cake can only slide along the inner plate surface of the chain plate 6 and avoid entering between adjacent chain plates 6.

[0053] In other embodiments, the cross-sectional shape of the follower roller 802 can also be set as a regular polygon, and the follower roller 802 can rotate around its own axis, so that the polygonal sidewall of the follower roller 802 can form a surface-to-surface fit with the surface of the chain plate 6. This surface contact form can increase the contact area between the follower roller 802 and the chain plate 6. A larger contact area can make the supporting force of the follower roller 802 on the chain plate 6 more evenly distributed on the surface of the chain plate 6, avoiding deformation of the chain plate 6 due to local force concentration, thereby ensuring the overall flatness of the chain structure during operation and reducing the problem of the scraper 7 moving trajectory deviation caused by the deformation of the chain plate 6.

[0054] In a further embodiment, the third drive module may also be configured to include a fourth drive motor, which is configured to drive one of the follower rollers 802 to rotate, thereby driving the chain structure to form a closed motion loop through the following of the other follower roller 802.

[0055] Another embodiment of the present invention provides a method for drying oily sludge, which employs an oily sludge drying system and includes the following steps: S1. Operate the filter belt 2 and the chain structure, and make the chain structure move periodically. When the chain structure moves, it synchronously drives the scraper 7 to move, and makes the movement trajectory of the scraper 7 extend along the bandwidth direction of the filter belt 2. Specifically, the first drive motor is started, which drives one of the first rotating rollers 401 to rotate. Through the movement of the other first rotating rollers 401 and the squeeze roller 3, the filter belt 2 located above is moved along... Figure 3 A closed transport loop is formed in the counterclockwise direction; the second drive motor is started, which drives one of the second rotating rollers 501 to rotate, and through the follow-up movement of the other second rotating rollers 501 and the squeeze roller 3, the filter belt 2 located below moves along... Figure 3 The clockwise direction forms a closed transport loop; the third drive motor 801 or the fourth drive motor is periodically started. The third drive motor 801 drives the gear 803 to rotate. The gear 803 meshes with the rack 804, causing the chain structure to move periodically; the fourth drive motor drives one of the follower rollers 802 to rotate. Through the following of the other follower roller 802, the chain structure is driven to move periodically.

[0056] S2. The oily sludge is placed on the filter belt 2 located above. The oily sludge is then transported by the part where the two filter belts 2 meet, and is dewatered under the pressure of the squeeze roller 3. It then moves to the outlet 202 of the part where the two filter belts 2 meet, and is scraped off by the scraper 7 as the filter belt 2 rotates.

[0057] Specifically, oily sludge is placed on the outer surface of the upper belt of the upper filter belt 2, and gradually spreads out on the outer surface of the upper belt of the upper filter belt 2. As the upper filter belt 2 rotates, the oily sludge moves from front to back and then falls onto the outer surface of the upper belt of the lower filter belt 2. As the lower filter belt 2 rotates, the oily sludge moves from back to front, and then enters from inlet 201 between the lower belt of the upper filter belt 2 and the upper belt of the lower filter belt 2. Then, the oily sludge is sandwiched between the lower layer of the upper filter belt 2 and the upper layer of the lower filter belt 2 and transported from back to front. When the oily sludge passes through the squeeze roller 3, it is gradually dehydrated and forms a filter cake under the squeezing action of the squeeze roller 3. The filter cake is then discharged from the outlet 202. As the upper filter belt 2 rotates, the filter cake adhering to the upper filter belt 2 is scraped off by the upper scraper 7. As the lower filter belt 2 rotates, the filter cake adhering to the lower filter belt 2 is scraped off by the lower scraper 7.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An oil-containing sludge drying system, characterized by, The oil-containing sludge drying treatment system comprises: a rack (1); two filter belts (2) each forming a closed conveying loop on the rack (1) and partially abutting; the abutting part of the two filter belts (2) is configured to be capable of clamping the oil-containing sludge for conveying; a plurality of extrusion rollers (3) each arranged on the rack (1) and capable of rotating around its own axis; the abutting part of the two filter belts (2) sequentially passes through the plurality of extrusion rollers (3), and the extrusion rollers (3) are configured to be capable of extruding the abutting part of the two filter belts (2) so that the clamped oil-containing sludge forms a filter cake; a plurality of chain plates (6) forming a chain structure and forming a closed movement loop on the rack (1) and located at the outlet (202) of the abutting part of the two filter belts (2), and the chain structure periodically moves; each chain plate (6) is provided with a scraper (7) inclined towards the filter belt (2) and abutting the outer belt surface of the filter belt (2) and configured to be capable of scraping off the filter cake, and the moving track of the scraper (7) extends along the width direction of the filter belt (2).

2. The oil-bearing sludge dewatering system of claim 1, wherein, The rack (1) is provided with a plurality of cutting parts (9) arranged at intervals along the width direction of the filter belt (2) and located at the outlet (202) of the abutting part of the two filter belts (2) and located at the rear side of the scraper (7), and the cutting part (9) is configured to be capable of cutting the filter cake along the length direction of the filter belt (2).

3. The oil-bearing sludge dewatering system of claim 2, wherein, The cutting part (9) is capable of elastically sliding along the length direction of the filter belt (2); the scraper (7) is capable of elastically sliding along its extending direction; the oil-containing sludge drying treatment system further comprises an adjusting module (10) configured to adjust the abutting pressure between the scraper (7) and the filter belt (2) according to the scraping resistance of the filter cake, and the greater the scraping resistance of the filter cake, the greater the abutting pressure between the scraper (7) and the filter belt (2).

4. The oil-bearing sludge dewatering system of claim 3, wherein, The adjusting module (10) comprises a plurality of stop blocks (1001) and a plurality of adjusting ropes (1002), the plurality of stop blocks (1001) are arranged at intervals along the width direction of the filter belt (2) and located at the outlet (202) of the abutting part of the two filter belts (2), the stop block (1001) is capable of sliding along a direction parallel to the extending direction of the scraper (7) and capable of forming a stop cooperation with the scraper (7); and the adjusting rope (1002) is connected between the stop block (1001) and the cutting part (9).

5. The oil-bearing sludge dewatering system of claim 2, wherein, A first elastic member is connected between each cutting part (9) and the rack (1).

6. The oil-bearing sludge dewatering system of claim 2, wherein, A second elastic member is connected between each scraper (7) and the chain plate (6).

7. The oil-bearing sludge dewatering system of claim 1, wherein The oil-containing sludge drying treatment system further comprises a first driving module configured to provide driving force for the operation of one of the filter belts (2).

8. The oil-bearing sludge dewatering system of claim 1, wherein, The oil-containing sludge drying treatment system further comprises a second driving module configured to provide driving force for the operation of the other filter belt (2).

9. The oil-bearing sludge dewatering system of claim 1, wherein, The oil-containing sludge drying treatment system further comprises a third driving module configured to provide driving force for the chain structure to operate.

10. An oil-containing sludge drying method characterized by comprising: The oil-containing sludge drying treatment system as claimed in claim 1, wherein the oil-containing sludge drying treatment method comprises the following steps: S1, operating the filter belt (2) and the chain structure, and periodically moving the chain structure, wherein the chain structure is synchronously driven to move the scraper (7) when moving, and the moving track of the scraper (7) extends along the width direction of the filter belt (2); S2, placing the oil-containing sludge on the filter belt (2) located above, wherein the oil-containing sludge is then clamped and transported by the abutting part of the two filter belts (2), and is dehydrated under the extrusion of the extrusion roller (3), and then moves to the outlet (202) of the abutting part of the two filter belts (2), and is scraped off by the scraper (7) along with the operation of the filter belt (2).

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