A sludge drying device

Abstract

The present invention discloses a sludge drying device, belonging to the technical field of sludge treatment equipment. Its structure includes a drying cylinder, a filter belt, a pressing roller I and a pressing roller II. An air inlet end and an air outlet end are respectively arranged on both sides of the drying cylinder. There are two filter belts, and the two filter belts are sleeved together with each other and are stretched and straightened in the middle of the drying cylinder through multiple groups of pressing rollers I and pressing rollers II. The edges of the ends of the two filter belts are abutted against each other to form a sealing structure. A storage space for temporarily storing the sludge to be pressure-filtered is formed by enclosing the middle parts of the two filter belts. Multiple groups of pressing rollers I and pressing rollers II divide the storage space into a vertical feeding area and multiple pressure-filtering areas. A sludge particle discharge bin and a sludge inlet bin are respectively arranged on the upper and lower sides of the vertical feeding area. This application combines heat treatment and pressure-filtering methods to dry the sludge. On this basis, the methods of sludge addition, accommodation and discharge are optimized, the sludge drying cycle is shortened, and the continuous use efficiency of the equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge treatment equipment, and specifically to a sludge drying device. Background Art

[0002] Sludge treatment is an important part of the sewage treatment system. Perfect sludge treatment facilities and technologies can improve the overall operation efficiency and treatment level of sewage treatment plants, and ensure the sustainable development of the sewage treatment industry;

[0003] There is a sludge drying device with the application number CN202311568111.8. In this patent document, a method of spraying a flocculant, combined with hot gas injection and continuous stirring, is disclosed to dry sludge with a relatively high water content. The dried sludge is discharged in the form of a mud cake. Specifically: the transmission shaft drives the stirring rod to revolve, and the cooperation of the worm gear, the first gear, and the second gear enables the stirring rod to rotate. The rotation of the stirring rod causes the auxiliary rod to extend out of the side wall of the stirring rod, thereby breaking up the massive sludge in the drying cylinder, and then facilitating the compaction component to compact and dry it. Through the cooperation of the inner rod, the plug, and the movable column, when the stirring rod rotates, the movable column opens the spraying port, and the plug makes the flocculant spray out as it rotates with the stirring rod. Subsequently, under the transportation of hot gas in the stirring rod, it is evenly transported into the sludge. With the cooperation of the stirring rod and the inner rod, even if the sludge enters the stirring rod, it will be sent out by the hot gas. When the sludge agglomerates in the stirring rod, it can also be ground by the cooperation of the stirring rod and the inner rod to avoid the problem that the stirring rod cannot rotate due to the presence of sludge inside. Through the setting of the auxiliary component, it is avoided that the larger sludge that has not been compacted by the compaction component and still contains moisture inside is directly discharged through the discharge port after passing through the auxiliary component;

[0004] However, when using the technical solution in the above patent document, the heat treatment method adopted is to dry the sludge to evaporate the internal moisture. The extrusion components in the equipment only undertake the function of discharging the dried sludge and do not have a filtering and pressing function; due to the low heat conduction efficiency, the drying cycle is long and the energy efficiency ratio is insufficient; at the same time, limited by the size of the material addition port and the discharge port, there is a bottleneck in the equipment processing capacity and continuous and efficient operation cannot be achieved. Therefore, the present application provides a sludge drying device. Summary of the Invention

[0005] In order to solve the above deficiencies in the prior art, the purpose of the present invention is to provide a sludge drying device. This device combines heat treatment and filtering and pressing methods to dry the sludge, and on this basis, optimizes the methods of sludge addition, accommodation, and discharge, shortens the sludge drying cycle, and improves the continuous use efficiency of the equipment.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0007] A sludge drying device is provided, which includes a drying cylinder, filter belts, pressing roller I and pressing roller II; an air inlet end and an air outlet end are respectively arranged on both sides of the drying cylinder. There are two filter belts, and the two filter belts are sleeved together with each other and are stretched and straightened in the middle of the drying cylinder by multiple groups of pressing roller I and pressing roller II. The edges of the ends of the two filter belts are abutted against each other to form a sealing structure, and a storage space for temporarily storing the sludge to be filter-pressed is formed by enclosing the middle parts of the two filter belts; multiple groups of pressing roller I and pressing roller II divide the storage space into a vertical feeding area and multiple filter-pressing areas. A sludge particle discharge bin and a sludge inlet bin are respectively arranged on the upper and lower sides of the vertical feeding area. The outer sides of the sludge inlet bin and the sludge particle discharge bin are abutted and fitted with the surface of the filter belt. A spiral conveyor rod is rotatably installed in the sludge particle discharge bin.

[0008] Further, a discharge chute opening is arranged at the bottom of the sludge inlet bin, a scraping and guiding edge is arranged at the top of the sludge particle discharge bin. Pipes I are respectively communicated and arranged at both ends of the sludge inlet bin, and a pipe II is communicated and arranged at one end of the sludge particle discharge bin. Both pipes I and pipe II penetrate through the drying cylinder and extend to the outside of the drying cylinder.

[0009] In this application, for a way to keep the edges of the ends of the two filter belts abutted against each other, an optional technical solution is: magnetic attraction points are arranged on the edges of the ends of the filter belts. Multiple magnetic attraction points on the two filter belts are in corresponding positions and are coupled and connected by magnetic attraction. The magnetic attraction points can use neodymium magnet spherical particles or cylindrical neodymium magnets.

[0010] In this application, for another way to keep the edges of the ends of the two filter belts abutted against each other, another optional technical solution is: a stepped edge is formed at the transition between the edge of the end of the filter belt and the filter belt. Annular grooves are respectively arranged in the middle of the outer sides of pressing roller I and pressing roller II. The stepped edge abuts against the edge of the annular groove. By increasing the number of pressing roller I and pressing roller II, the proportion of the area where the two filter belts are continuously pressed is increased to prevent sludge from leaking from the edge.

[0011] Further, two clamping plates are arranged in the drying cylinder. The inner side surface of the clamping plate is abutted and fitted with the surface of the filter belt. One clamping plate is detachably and fixedly connected to the inner side wall of the drying cylinder. The two clamping plates are connected together by four U-shaped docking seats. The four U-shaped docking seats are divided into two groups, and the two groups of U-shaped docking seats are respectively sleeved on both ends of the sludge inlet bin and the sludge particle discharge bin.

[0012] Further, a fan blade is rotatably installed in the air inlet end. A gear shaft is fixedly installed at the end of the fan blade. An exhaust pipe is communicated and arranged at the air outlet end. A motor I is installed at the lower end of the side of the drying cylinder. A driving gear is installed on the output shaft of the motor I. The driving gear and the gear shaft are connected by a transmission belt.

[0013] Further, two pressing rollers I in the same group are jointly rotatably installed on a side extension bracket, and multiple side extension brackets are distributed on the outer peripheral side of the shaft rod. The shaft rod is fixedly installed on the base; a driving shaft is arranged at the end of the pressing roller I, and a motor III for controlling the rotation of the driving shaft is installed on the side extension bracket. The output shaft of the motor III is connected to the driving shaft through a coupling.

[0014] Further, two pressing rollers II in the same group are jointly rotatably installed on a telescopic frame, and multiple telescopic frames are distributed on the inner peripheral side of the drying cylinder. A telescopic driver for driving the telescopic frame to move in a direction perpendicular to the axis of the shaft rod is installed on the drying cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. In the sludge drying device according to the example of the present invention, hot air is sent into the air inlet end. The hot air passes through the filter holes on the surface of the filter belt to take away the moisture in the sludge in the storage space. Subsequently, the air containing droplets is discharged from the air outlet end; multiple pressing rollers I and pressing rollers II are driven to rotate synchronously. Since the distance between each group of pressing rollers I and pressing rollers II gradually decreases along the sludge conveying direction, the sludge in the storage space is subjected to step-by-step pressure filtration treatment; under the combined action of the hot air flow and the pressure filtration of multiple groups of pressing rollers I and pressing rollers II, the droplets extruded from the sludge and permeated to the surface of the filter belt are dried.

[0017] 2. In the sludge drying device according to the example of the present invention, during the continuous operation of controlling the two filter belts, heat treatment drying and pressure filtration drying are carried out on the sludge. Through the sludge introduction bin and the sludge particle discharge bin, sludge is continuously injected into the storage space and the dried sludge is discharged from the storage space. The method of adding, accommodating, and discharging sludge is optimized to realize the full-process connection of continuous feeding, treatment, and discharging of sludge, replacing the steps of separately injecting and discharging sludge into the equipment, reducing unnecessary time loss, realizing the dynamic continuous drying of sludge, shortening the sludge drying cycle, and improving the continuous use efficiency of the equipment.

[0018] 3. In the sludge drying device according to the example of the present invention, a stepped edge is formed at the transition between the edge of the end of the filter belt and the filter belt. Annular grooves are respectively arranged in the middle of the outer sides of the pressing rollers I and pressing rollers II. The stepped edge abuts against the edge of the annular groove. By increasing the number of the pressing rollers I and pressing rollers II, the proportion of the area where the two filter belts are continuously pressed is increased, and sludge leakage from the edge is avoided.

[0019] 4. In the sludge drying device according to the example of the present invention, magnetic attraction points are arranged on the edge of the end of the filter belt. The magnetic attraction points on the two filter belts are in corresponding positions and are coupled and connected by magnetic attraction. The magnetic attraction points can use neodymium magnet spherical particles or cylindrical neodymium magnets; using the above scheme, the width of the edge can be shortened, so as to increase the amount of sludge that can be accommodated in the storage space and improve the efficiency of the equipment for sludge drying. Description of the Drawings

[0020] Other features, objectives, and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 Structural schematic of the overall sludge drying device provided by the embodiment of the present invention Figure 1 ;

[0022] Figure 2 Structural schematic of the overall sludge drying device provided by the embodiment of the present invention Figure 2 ;

[0023] Figure 3 Cross-sectional profile of the intake end and exhaust end provided by the embodiment of the present invention;

[0024] Figure 4 Structural schematic of a part of the sludge drying device provided by the embodiment of the present invention Figure 1 ;

[0025] Figure 5 Structural schematic of a part of the sludge drying device provided by the embodiment of the present invention Figure 2 ;

[0026] Figure 6 Of the present invention Figure 5 Enlarged view of location A;

[0027] Figure 7 Structural schematic of a part of the sludge drying device provided by the embodiment of the present invention Figure 3 ;

[0028] Figure 8 Partially enlarged view of the filter belt provided by the embodiment of the present invention;

[0029] Figure 9 Exploded view of the filter belt, clamping plate, sludge inlet bin, and sludge pellet outlet bin provided by the embodiment of the present invention;

[0030] Figure 10 Cross-sectional profile of the sludge inlet bin and sludge pellet outlet bin provided by the embodiment of the present invention;

[0031] Figure 11 Structural schematic of a part of the sludge drying device provided by the embodiment of the present invention Figure 4 ;

[0032] Figure 12 Structural schematic of the telescopic frame, roller II, and telescopic driver provided by the embodiment of the present invention.

[0033] In the figure: 11, drying cylinder; 12, intake end; 13, exhaust end; 131, exhaust pipe; 14, fan blade; 141, gear shaft; 142, motor I; 21, filter belt; 211, storage space; 22, edge; 221, stepped edge; 23, magnetic attraction point; 31, base; 32, shaft rod; 33, side extension bracket; 34, pressure roller I; 341, drive shaft; 35, telescopic bracket; 36, pressure roller II; 37, telescopic driver; 41, clamping plate; 42, U-shaped docking seat; 43, sludge inlet bin; 431, discharge chute opening; 432, pipe I; 44, mud particle outlet bin; 441, scraping inlet edge; 442, pipe II; 45, spiral conveyor rod; 451, motor II. Detailed implementation manners

[0034] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments.

[0035] Generally, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention.

[0036] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Additionally, it should also be noted that for ease of description, only the parts related to the invention are shown in the drawings.

[0040] Embodiment 1: As shown in Figure 1 , Figure 4 , Figure 5 and Figure 7 , this embodiment provides a sludge drying device, which includes a drying cylinder 11, a filter belt 21, a pressure roller I 34, and a pressure roller II 36; an air inlet end 12 and an exhaust end 13 are respectively arranged on both sides of the drying cylinder 11, there are two filter belts 21, the two filter belts 21 are sleeved together with each other, and are stretched by multiple groups of pressure roller I 34 and pressure roller II 36, and are straightened in a zigzag state in the middle of the drying cylinder 11. The edges 22 at the ends of the two filter belts 21 abut against each other to form a sealing structure. A storage space 211 for temporarily storing the sludge to be pressure-filtered is formed by enclosing the middle parts of the two filter belts 21. The cross-section of the storage space 211 is wedge-shaped, with a large spacing in the middle and a small spacing at the ends, restricting the sludge mainly in the middle of the storage space 211 to prevent the sludge from leaking from the edge of the storage space 211.

[0041] In this embodiment, both the air inlet end 12 and the exhaust end 13 adopt a duct structure, and the end of the air inlet end 12 is connected to an electric heating air heater or an oil-fired hot blast stove; the spacing between each group of pressure roller I 34 and pressure roller II 36 gradually decreases along the sludge conveying direction, and the pressure roller I 34 and the pressure roller II 36 are directly rotationally connected to the inside of the drying cylinder 11 through a bracket; a plurality of motors are installed on the drying cylinder 11, and the number of motors is the same as the number of pressure roller I 34 and pressure roller II 36, and is used to drive the plurality of pressure roller I 34 and pressure roller II 36 to rotate synchronously.

[0042] As shown in Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 10 , multiple groups of pressure roller I 34 and pressure roller II 36 divide the storage space 211 into a vertical feeding area and multiple pressure filtering areas. A sludge particle discharge bin 44 and a sludge inlet bin 43 are respectively arranged on the upper and lower sides of the vertical feeding area. The outer sides of the sludge inlet bin 43 and the sludge particle discharge bin 44 are in contact and fit with the surface of the filter belt 21. A spiral conveyor 45 is rotatably installed in the sludge particle discharge bin 44.

[0043] As shown in Figure 2 , Figure 4 , Figure 6 and Figure 10As shown in the figure, a discharge chute opening 431 is provided in the middle of the bottom of the sludge introduction bin 43, a scraping material introduction edge 441 is provided in the middle of the top of the sludge particle discharge bin 44, and pipe I 432 is respectively connected and arranged at both ends of the sludge introduction bin 43. One end of the sludge particle discharge bin 44 is connected and arranged with pipe II 442. Both pipe I 432 and pipe II 442 penetrate through the drying cylinder 11 and extend to the outside of the drying cylinder 11.

[0044] The specific details of drying the sludge using the sludge drying device of the present application are as follows:

[0045] I. Inject sludge into the storage space 211;

[0046] Install a screw pump or a plunger pump on pipe I 432, operate the pump body, inject sludge with a water content of 65% to 75% into pipe I 432. The sludge flows along pipe I 432 into the sludge introduction bin 43 and is discharged from the middle of the bottom of the sludge introduction bin 43 into the storage space 211, completing the injection operation of the sludge in the storage space 211.

[0047] II. Adopt the heat treatment method to dry the sludge in the storage space 211;

[0048] Send hot air to the air inlet end 12. The hot air takes away the moisture in the sludge in the storage space 211 through the surface filter holes of the filter belt 21. Subsequently, the air containing droplets is discharged from the exhaust end 13. Since the filter belt 21 extends in a zigzag manner, the contact area between the sludge and the filter belt 21 and the hot air flow is greatly increased, improving the drying efficiency of the sludge.

[0049] III. Combine the heat treatment and pressure filtration methods to dry the sludge in the storage space 211;

[0050] Start multiple motors simultaneously to drive multiple pressure rollers I 34 and pressure rollers II 36 to rotate synchronously. Since the distance between each group of pressure rollers I 34 and pressure rollers II 36 gradually decreases along the sludge conveying direction, the sludge in the storage space 211 is subjected to step-by-step pressure filtration treatment. In addition, under the combined action of the hot air flow and the pressure filtration of multiple groups of pressure rollers I 34 and pressure rollers II 36, the droplets extruded from the sludge and penetrating to the surface of the filter belt 21 are dried.

[0051] IV. Discharge the dried sludge from the storage space 211;

[0052] As multiple groups of pressure rollers I 34 and pressure rollers II 36 rotate, as Figure 4As shown, the two filter belts 21 continuously run counterclockwise, driving the sludge to move synchronously. The sludge after step-by-step pressure filtration moves to the upper side of the sludge particle export bin 44 and enters the sludge particle export bin 44 along the scraping material inlet 441. After that, the continuous rotation of the screw conveyor rod 45 crushes the dried sludge and injects it into the pipe II 442, and finally discharges it to the outside of the drying cylinder 11.

[0053] Using the above solution of the present application, during the process of controlling the continuous operation of the two filter belts 21, heat treatment drying and pressure filtration drying are performed on the sludge. Through the sludge inlet bin 43 and the sludge particle export bin 44, sludge is continuously injected into the storage space 211 and the dried sludge is discharged from the storage space 211, optimizing the methods of sludge addition, accommodation and discharge, realizing the full-process connection of continuous feeding, treatment and export of sludge, replacing the steps of separately injecting and exporting sludge into the equipment, reducing unnecessary time loss, realizing dynamic continuous drying of sludge, shortening the sludge drying cycle, and improving the continuous use efficiency of the equipment.

[0054] In this embodiment, a stepped edge 221 is formed at the transition between the edge 22 at the end of the filter belt 21 and the filter belt 21. Annular grooves are respectively provided in the middle of the outer sides of the first pressure roller 34 and the second pressure roller 36. The stepped edge 221 abuts against the edge of the annular groove. By increasing the number of the first pressure roller 34 and the second pressure roller 36, the proportion of the area where the two filter belts 21 are continuously pressed is increased, avoiding the leakage of sludge from the edge 22.

[0055] It should be noted that Figure 7 the width ratio of the edge 22 shown in the figure at the end of the filter belt 21 is only for illustration, and the width of the edge 22 is adaptively increased according to the water content and fluidity of the sludge usually processed.

[0056] Embodiment 2: The features that are the same as those in Embodiment 1 will not be described in detail. The different solutions in this embodiment from Embodiment 1 are as follows: As Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9 shown, in this embodiment, two clamping plates 41 are provided in the drying cylinder 11. One clamping plate 41 is detachably and fixedly connected to the inner side wall of the drying cylinder 11. The two clamping plates 41 are connected together by four U-shaped docking seats 42. The four U-shaped docking seats 42 are divided into two groups in pairs, and the two groups of U-shaped docking seats 42 are respectively sleeved on both ends of the sludge inlet bin 43 and the sludge particle export bin 44.

[0057] As Figure 6As shown, the inner side surface of the clamp 41 is in contact with the surface of the filter belt 21, and the two ends of the sludge inlet bin 43 and the mud particle outlet bin 44 are located between the two clamps 41. The clamps 41 are used to squeeze and limit the two filter belts 21 from the outside to the inside, so that the filter belt 21 is tightly fitted with the sludge inlet bin 43 and the mud particle outlet bin 44, thereby increasing the sealing of the sludge being injected into the storage space 211 and discharged from the storage space 211.

[0058] The cross-sections of the sludge inlet bin 43 and the mud particle outlet bin 44 are drop-shaped, so that the two filter belts 21 can be easily opened on the upper side of the mud particle outlet bin 44 and gradually closed together on the lower side of the sludge inlet bin 43 .

[0059] Embodiment 3: The features of this embodiment that are the same as those of Embodiment 1 are not described in detail. The difference between this embodiment and Embodiment 1 is that: Figure 7 and Figure 8 As shown, in this embodiment, a magnetic attraction point 23 is provided on the edge 22 of the end of the filter belt 21, and the multiple magnetic attraction points 23 on the two filter belts 21 correspond in position and are connected by magnetic adsorption coupling. The magnetic attraction points 23 can use spherical particles of neodymium magnets or cylindrical neodymium magnets.

[0060] When using neodymium magnet spherical particles; multiple neodymium magnet spherical particles are evenly spaced and embedded into the edge of the end of the filter belt 21, and the magnetic attraction between the neodymium magnet spherical particles on the two filter belts 21 is used to prevent the sludge from leaking from the edge 22;

[0061] When using cylindrical neodymium magnets, multiple cylindrical neodymium magnets are horizontally embedded into the edge of the end of the filter belt 21, so that the extension direction of the cylindrical neodymium magnets is parallel to the axial direction of the pressure roller I 34 and the pressure roller II 36, ensuring that the filter belt 21 can be bent smoothly.

[0062] Compared with the first embodiment, the sealing of the end edges 22 of the two filter belts 21 is maintained by utilizing the docking and abutment between the annular groove and the stepped edge 221. By using the above-mentioned scheme of this embodiment, the width of the edge 22 can be shortened, thereby increasing the amount of sludge that can be accommodated in the storage space 211 and improving the efficiency of the equipment for sludge drying.

[0063] Embodiment 4: The features of this embodiment that are the same as those of the embodiment 1 are not described in detail. The difference between this embodiment and the embodiment 1 is that: Figure 1 , Figure 2 and Figure 3As shown in the figure, in this embodiment, an electric heating module is installed inside the drying cylinder 11. The electric heating module uses an electric heating platform or an electric heating rod. A fan blade 14 is rotatably installed inside the air inlet end 12. A gear shaft 141 is fixedly installed at the end of the fan blade 14. An exhaust pipe 131 is communicatively provided on the exhaust end 13. A motor I 142 is installed at the lower end of the side of the drying cylinder 11. A driving gear is installed on the output shaft of the motor I 142. The driving gear and the gear shaft 141 are connected by a transmission belt.

[0064] The heat generated by the electric heating module is used to dry the sludge in the storage space 211. At the same time, the motor I 142 is started, the driving gear is controlled to rotate, and the transmission belt is used to drive the gear shaft 141 and the fan blade 14 to rotate, driving the air flow, and discharging the moisture of the hot air rising to the inside of the drying cylinder 11 from the exhaust pipe 131. After being filtered, it is discharged to the atmosphere; multiple sludge drying devices of the present application can be used simultaneously. The exhaust pipes 131 on multiple sludge drying devices are connected and communicated, and after unified filtration and purification, harmful gases released from the sludge are prevented from having an adverse impact on the environment.

[0065] Embodiment Five: The features that are the same as those in Embodiment One will not be described in detail. The different solutions in this embodiment from those in Embodiment One are as follows: As Figure 4 、 Figure 5 、 Figure 7 and Figure 11 shown in the figure, in this embodiment, two pressing rollers I 34 in the same group are jointly rotatably installed on a side extension bracket 33. Multiple side extension brackets 33 are distributed on the outer circumference of the shaft rod 32. The shaft rod 32 is fixedly installed on the base 31; a driving shaft 341 is provided at the end of the pressing roller I 34. A motor III for controlling the rotation of the driving shaft 341 is installed on the side extension bracket 33. The output shaft of the motor III is connected to the driving shaft 341 through a coupling.

[0066] As Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 12 shown in the figure, two pressing rollers II 36 in the same group are jointly rotatably installed on a telescopic frame 35. Multiple telescopic frames 35 are distributed on the inner circumference of the drying cylinder 11. A telescopic driver 37 for driving the telescopic frame 35 to move in a direction perpendicular to the axis of the shaft rod 32 is installed on the drying cylinder 11.

[0067] Start the motors Ⅲ on multiple side extension brackets 33, control the synchronous rotation of multiple pressure rollers Ⅰ34, drive the two filter belts 21 and the sludge in the sludge introduction bin 43 to run between multiple groups of pressure rollers Ⅰ34 and pressure rollers Ⅱ36. At the same time, start the telescopic drivers 37 corresponding to multiple telescopic frames 35 respectively, so that the distance between multiple telescopic frames 35 and the axis of the shaft rod 32 gradually decreases along the sludge conveying direction, so that the stretching degrees of the two filter belts 21 at multiple pressure filtration areas are different, and the sludge in the storage space 211 is subjected to step-by-step pressure filtration treatment.

[0068] Compared with the first embodiment, by setting the distance between each group of pressure rollers Ⅰ34 and pressure rollers Ⅱ36, the multi-stage sludge pressure filtration intensity is adjusted. Using the above scheme of this embodiment, the pressure filtration intensity of the sludge can be adjusted in real time, and it has a strong adaptability when facing sludges with different water contents, effectively avoiding the sludge from clogging at local positions in the storage space 211.

[0069] The telescopic driver of this application uses a linear electric cylinder or a hydraulic cylinder that can be purchased on the market; the motor uses a Siemens Simotics XP series motor with a high temperature resistance level or a special explosion-proof motor of NEMA Premium.

[0070] The above description is only a preferred embodiment of this application and an explanation of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in this application.

[0071] Except for the technical features described in the specification, the remaining technical features are well-known to those skilled in the art. To highlight the innovative features of the present invention, the remaining technical features will not be elaborated here.

Claims

1. A sludge drying device, comprising a drying cylinder (11), characterized in that, On both sides of the drying cylinder (11), an air inlet end (12) and an exhaust end (13) are respectively arranged. In the middle of the drying cylinder (11), there are two filter belts (21) sleeved with each other. The edges (22) at the ends of the two filter belts (21) are abutted against each other to form a sealing structure. The middle parts of the two filter belts (21) enclose a storage space (211) for temporarily storing the sludge to be pressure-filtered. Inside the drying cylinder (11), there are multiple groups of roller I (34) and roller II (36) for maintaining the tensioned and fitted state of the two filter belts (21), and dividing the storage space (211) into a vertical feeding area and multiple pressure-filtering areas. On the upper and lower sides of the vertical feeding area, a mud particle discharging bin (44) and a sludge feeding bin (43) are respectively arranged. The outer sides of the sludge feeding bin (43) and the mud particle discharging bin (44) are abutted and fitted with the surface of the filter belt (21). At the bottom of the sludge feeding bin (43) and the top of the mud particle discharging bin (44), a discharge slot (431) and a scraping and guiding edge (441) are respectively arranged. The pipe I (432) at the end of the sludge feeding bin (43) and the pipe II (442) at the end of the mud particle discharging bin (44) penetrate through the drying cylinder (11) and extend outward. Inside the mud particle discharging bin (44), a spiral conveyor rod (45) is rotatably installed. At the transition between the edge (22) at the end of the filter belt (21) and the filter belt (21), a stepped edge (221) is formed. Annular grooves are respectively arranged in the middle of the outer sides of the roller I (34) and the roller II (36). The stepped edge (221) abuts against the edge of the annular groove.

2. The sludge drying device according to claim 1, wherein Inside the drying cylinder (11), there are two clamping plates (41). The inner sides of the clamping plates (41) are abutted and fitted with the surface of the filter belt (21). One side of the clamping plate (41) is detachably and fixedly connected to the inner side wall of the drying cylinder (11). The two clamping plates (41) are connected together through multiple U-shaped docking seats (42). The multiple U-shaped docking seats (42) are respectively sleeved at both ends of the sludge feeding bin (43) and the mud particle discharging bin (44).

3. The sludge drying device according to claim 1, characterized in that, Inside the air inlet end (12), a fan blade (14) is rotatably installed. An exhaust pipe (131) is communicated with the exhaust end (13).

4. The sludge drying device according to claim 1, characterized in that, Two roller I (34) in the same group are jointly rotatably installed on a side extension bracket (33). Multiple side extension brackets (33) are distributed on the outer peripheral side of the shaft rod (32). The shaft rod (32) is fixedly installed on the base (31).

5. The sludge drying device according to claim 1, wherein Two roller II (36) in the same group are jointly rotatably installed on a telescopic frame (35). Multiple telescopic frames (35) are distributed on the inner peripheral side of the drying cylinder (11). On the drying cylinder (11), a telescopic driver (37) for driving the telescopic frame (35) to move in the direction perpendicular to the axis of the shaft rod (32) is installed.

6. The sludge drying device according to claim 1, characterized in that, On the edge (22) at the end of the filter belt (21), magnetic attraction points (23) are arranged. The multiple magnetic attraction points (23) on the two filter belts (21) are in corresponding positions and are coupled and connected by magnetic attraction.

7. The sludge drying device according to claim 1, wherein, The cross-section of the storage space (211) is wedge-shaped, with a large spacing in the middle and a small spacing at the ends.

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