Silt drying device

Abstract

The application discloses a kind of sludge drying device, comprising: drying unit, for drying sludge;Preheating push unit, be located in the upper end of the drying unit, for sludge is preliminarily dried into soft state and is pushed into the drying unit again for drying;Feeding unit, be located in the upper end of the preheating push unit, for preheating push unit is fed;The drying unit includes: slicing assembly, be located in the feeding end of the drying unit, for the wet soil of preheating push unit continuous push is cut into piece.By extrusion assembly, the sludge that is preliminarily dried into soft state in inside is extruded to slicing assembly and is cut, piece-shaped sludge after cutting is first transitioned on slicing assembly and is dried again before scraping off to drying unit and is completely dried, so that it is ensured that sludge is in piece-shaped before entering drying unit, effectively avoid sludge and the inner wall of drying unit adhesion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge drying, in particular to a sludge drying device. BACKGROUND

[0002] Sludge is a cohesive soil deposited in still or slow-flowing water environments, formed by biochemical action, with a natural water content greater than the liquid limit and a natural void ratio greater than or equal to 1.5. It is a modern deposit formed under the action of microorganisms and is rich in organic matter, usually gray-black in color. During the processing of salvaged sludge, drying equipment is usually used to dry the sludge, so that the dried sludge can be easily transported.

[0003] When the existing sludge drying equipment dries the sludge, the sludge with a lot of water is usually directly placed in the drying furnace for drying. However, during the drying process, the moist sludge has a certain stickiness, and the drying equipment usually provides heat from the inner wall to dry the sludge. The sludge directly placed in the drying equipment will stick to the inner wall of the drying equipment, causing the sludge sticking to the inner wall of the drying equipment to absorb and block the heat of the inner wall of the drying equipment during the drying process. Only a part of the heat of the inner wall of the drying equipment can dry the sludge not sticking to the inner wall of the drying equipment, and a large amount of heat is needed to completely dry the sludge in the drying equipment.

[0004] In addition, after the existing sludge drying equipment finishes drying, the dried sludge is usually in a powdery state and is relatively loose, which causes the dried sludge to occupy a large space, making it difficult for subsequent bagging and transportation, and a large amount of dust is generated during the bagging process.

[0005] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as the closest prior art. SUMMARY

[0006] The present application aims to provide a sludge drying device to solve the problems of sludge sticking to the inner wall of the drying equipment during the drying process, high drying energy consumption, and the dried sludge being in a powdery state and being difficult to bag and transport.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] A sludge drying device, comprising:

[0009] a drying unit for drying the sludge;

[0010] a preheating and pushing unit arranged at the upper end of the drying unit for preliminarily drying the sludge to a soft state and pushing it into the drying unit for further drying;

[0011] A feeding unit is arranged on the upper end of the preheating and pushing unit, and is configured to feed the preheating and pushing unit;

[0012] The drying unit comprises:

[0013] A slicing assembly is arranged at the feeding end of the drying unit, and is configured to slice the wet soil continuously pushed by the preheating and pushing unit into pieces;

[0014] The preheating and pushing unit comprises:

[0015] An extruding assembly is configured to preliminarily dry the sludge fed by the feeding unit into wet soil and continuously extrude the wet soil;

[0016] An air outlet assembly is arranged on the upper part of the extruding assembly, and is configured to discharge water vapor during the drying of the sludge by the extruding assembly.

[0017] Further, the drying unit comprises:

[0018] A first support;

[0019] A rotary kiln is arranged on the upper end of the first support, and is configured to dry the sludge sliced by the slicing assembly;

[0020] A collecting box is arranged at the discharging end of the rotary kiln, and is configured to accommodate the dried sludge pieces.

[0021] Further, the slicing assembly comprises:

[0022] An extension plate is connected to the upper end of the first support and has its side part located inside the rotary kiln;

[0023] A driving shaft is rotatably connected to the inside of the extension plate;

[0024] A receiving plate is connected to the outside of the driving shaft, and is configured to receive the sliced sludge pieces;

[0025] A slicing knife is connected to the outside of the driving shaft and located above the receiving plate, and is configured to slice the sludge extruded by the extruding assembly; and

[0026] A scraping plate is connected to the side part of the extension plate and has its upper end close to the upper surface of the receiving plate, and is configured to scrape the sludge pieces on the receiving plate into the rotary kiln;

[0027] The receiving plate and the slicing knife are provided with multiple groups and correspond to each other in an up-down manner.

[0028] Further, the extruding assembly comprises:

[0029] A second support;

[0030] A preheating box is connected to the upper end of the second support and used for heating the sludge to a soft state. An inlet is arranged at the upper end of the preheating box and used for guiding the sludge in the feeding unit into the preheating box.

[0031] An outlet pipe is connected to the upper end of the preheating box and used for guiding the preliminarily dried sludge in the preheating box to the slicing assembly.

[0032] A heating wall is arranged in the preheating box and used for buffering and preliminarily drying the sludge.

[0033] A push plate is slidingly inserted into the heating wall and used for extruding the preliminarily dried sludge in the heating wall. A fender is connected to the upper side of the push plate and used for closing the inlet during the extrusion of the sludge in the preheating box.

[0034] A cylinder is connected to one end of the push plate and extends to the outside of the preheating box and used for controlling the push plate to move.

[0035] Further, a guide hole is arranged in the push plate, and a heating rod is inserted into the guide hole and used for heating and drying the sludge in the heating wall.

[0036] One end of the heating rod is connected to the heating wall, and a heat source extends from the preheating box to the heating rod.

[0037] Further, the air outlet assembly comprises:

[0038] An air valve mechanism is connected to the upper end of the preheating box and used for controlling the connection state between the preheating process and the extrusion process of the preheating box and the outside.

[0039] An air outlet is arranged in the air valve mechanism and used for connecting the inside of the preheating box with the outside.

[0040] A guide groove is arranged in the air valve mechanism.

[0041] A sealing block is slidingly inserted into the guide groove and used for adjusting the opening and closing state of the air outlet.

[0042] Further, a push rod is inserted into the sealing block and used for adjusting the sealing state of the sealing block to the air outlet.

[0043] A limiting sleeve is arranged on the outside of the push rod. A pre-tightening spring is arranged on the outside of the push rod and between the limiting sleeve and the sealing block and used for moving the sealing block along the guide groove.

[0044] A top plate is connected to one side of the upper end of the fender. One end of the push rod is connected to the top plate.

[0045] Further, the feeding unit comprises:

[0046] pre-storage box for pre-storing the sludge before drying;

[0047] quantitative box connected to the discharging end of the pre-storage box for guiding the sludge in the pre-storage box into the extruding assembly;

[0048] guide plate arranged at the upper position inside the quantitative box;

[0049] valve slidingly inserted into the guide plate for spacing the sludge in the pre-storage box and the quantitative box, the valve being provided with a through slot for guiding the sludge in the pre-storage box into the quantitative box;

[0050] reset spring connected to one side of the valve and located inside the guide plate for resetting the valve.

[0051] Compared with the prior art, the present application has the following advantages:

[0052] The present application extrudes the sludge preliminarily dried into soft state inside the extruding assembly to the slicing assembly for slicing, and the sliced sludge is first transitionally dried on the slicing assembly and then scraped into the drying unit for complete drying, so that the sludge is in the state of being ready to be dried before entering the drying unit, effectively avoiding the adhesion of the sludge to the inner wall of the drying unit and reducing the energy consumption for drying the sludge. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the present application;

[0054] Figure 2 Fig. 2 is a partial sectional view of the present application;

[0055] Figure 3 Fig. 3 is a schematic diagram of the internal structure of the feeding unit of the present application;

[0056] Figure 4 Fig. 4 is a schematic diagram of the internal structure of the preheating and pushing unit of the present application;

[0057] Figure 5 Fig. 5 is a schematic diagram of the internal structure of the air outlet assembly of the present application;

[0058] Figure 6 Fig. 6 is a schematic diagram of the structure of the slicing assembly of the present application.

[0059] Label: 1, drying unit; 2, preheating and pushing unit; 3, feeding unit; 11, first support; 12, rotary kiln; 13, collection box; 14, slicing assembly; 141, extension plate; 142, drive shaft; 143, receiving plate; 144, slicing knife; 145, material scraping plate; 146, fastening frame; 21, extrusion assembly; 22, air outlet assembly; 211, second support; 212, preheating box; 2121, heating wall; 2122, heating rod; 2123, feeding port; 213, mud outlet pipe; 214, push plate; 2140, guide hole; 2141, mud baffle; 2142, top plate; 215, air cylinder; 221, air valve mechanism; 222, air outlet; 223, guide groove; 224, sealing block; 225, push rod; 2251, limiting sleeve; 226, pre-tightening spring; 31, pre-storage frame; 32, quantitative box; 33, guide plate; 34, valve; 341, through groove; 35, return spring. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0061] Please refer to Figures 1-6 The present application provides a technical solution:

[0062] A sludge drying device, comprising:

[0063] A drying unit 1 is used for drying sludge.

[0064] A preheating and pushing unit 2 is arranged at the upper end of the drying unit 1, and is used for preliminarily drying the sludge into a soft state and pushing the sludge into the drying unit 1 for further drying. The soft state refers to a soil with a water content of 60%-70% and a certain flowability and plasticity.

[0065] A feeding unit 3 is arranged at the upper end of the preheating and pushing unit 2, and is used for feeding the preheating and pushing unit 2.

[0066] The drying unit 1 comprises:

[0067] A slicing assembly 14 is arranged at the feeding end of the drying unit 1, and is used for slicing the wet soil continuously pushed by the preheating and pushing unit 2 into pieces.

[0068] The preheating and pushing unit 2 comprises:

[0069] An extruding assembly 21 is arranged above the feeding assembly 3 for preliminarily drying the sludge into wet soil and continuously extruding the wet soil;

[0070] An air outlet assembly 22 is arranged above the extruding assembly 21 for discharging water vapor during the drying process of the sludge in the extruding assembly 21.

[0071] It is to be noted that, in use, the sludge is poured into the feeding assembly 3, and the sludge is preliminarily dried into soft state by the heat source arranged in the extruding assembly 21 from the state of slurry. During the preliminary drying process, the air outlet assembly 22 is synchronously opened to discharge the gas evaporated in the preliminary drying process. Then, the extruding assembly 21 extrudes the sludge preliminarily dried into soft state to the slicing assembly 14 for slicing. The sliced sludge is firstly transferred on the slicing assembly 14 for further drying and then scraped into the drying unit 1 for complete drying, so that the sludge is in the state of being dried before entering the drying unit 1, effectively avoiding the adhesion of the sludge to the inner wall of the drying unit 1 and reducing the energy consumption for drying the sludge.

[0072] As an improvement, as shown in Figures 1-2 The drying unit 1 comprises:

[0073] a first support 11;

[0074] a rotary kiln 12 mounted on the upper end of the first support 11 for drying the sludge sliced by the slicing assembly 14;

[0075] a collecting box 13 arranged at the discharging end of the rotary kiln 12 for receiving the dried sludge.

[0076] Further, as shown in Figure 6 The slicing assembly 14 comprises:

[0077] an extension plate 141 connected to the upper end of the first support 11 and having its side portion arranged inside the rotary kiln 12;

[0078] a motor arranged inside the extension plate 141 for driving the rotation of a driving shaft 142, which is not shown in the figure;

[0079] the driving shaft 142 is rotatably connected to the inside of the extension plate 141;

[0080] a receiving plate 143 connected to the outside of the driving shaft 142 for receiving the sliced sludge;

[0081] a slicing knife 144 connected to the outside of the driving shaft 142 and arranged above the receiving plate for slicing the sludge extruded by the extruding assembly 21; and

[0082] A scraping plate 145 is connected to the side of the extension plate 141 and its upper end is close to the upper surface of the bearing plate, which is used to scrape the sludge on the bearing plate into the rotary kiln 12.

[0083] The bearing plate 143 and the slicing knife 144 are provided with multiple groups and correspond one by one from top to bottom.

[0084] As an improvement, as Figures 2-5 As shown in the figure, the extrusion assembly 21 comprises:

[0085] A second support 211;

[0086] A preheating box 212 is connected to the upper end of the second support 211, which is used to heat the sludge to a soft state. The upper end of the preheating box 212 is provided with a feeding port 2123, which is used to guide the sludge in the feeding unit 3 into the preheating box 212.

[0087] A sludge outlet pipe 213 is connected to the upper position of the discharge end of the preheating box 212, which is used to guide the preliminarily dried sludge in the preheating box 212 to the slicing assembly 14.

[0088] A heating wall 2121 is provided inside the preheating box 212, which is used to store and preliminarily heat and dry the sludge.

[0089] A push plate 214 is slidingly inserted into the heating wall 2121, which is used to extrude the preliminarily dried sludge in the heating wall 2121. The upper side of the push plate 214 is connected with a mud baffle 2141, which is used to close the feeding port 2123 during the extrusion of the sludge in the preheating box 212.

[0090] A gas cylinder 215 is connected to one end of the push plate 214 and extends to the outside of the preheating box 212, which is used to control the push and pull movement of the push plate 214.

[0091] Preferably, the sludge outlet pipe 213 is connected with a fastening frame 146 on one side inside the rotary kiln 12, which is used to reinforce the sludge outlet pipe 213. The fastening frame 146 is connected to the upper end of the extension plate 141.

[0092] Further, as Figure 4 As shown in the figure, the push plate 214 is provided with a guide hole 2140. A heating rod 2122 is inserted into the guide hole 2140, which is used to heat and dry the sludge inside the heating wall 2121.

[0093] One end of the heating rod 2122 is connected to the heating wall 2121, and the heat source extends from the preheating box 212 into the heating rod 2122.

[0094] Further, as Figure 5 As shown in the figure, the gas outlet assembly 22 comprises:

[0095] The air valve mechanism 221 is connected to the upper end of the preheating box 212 and is used to control the connection status between the preheating process and the extrusion process of the preheating box 212 and the outside.

[0096] The air outlet 222 is located inside the air valve mechanism 221 and is used to connect the inside of the preheating box 212 with the outside.

[0097] The guide groove 223 is located inside the air valve mechanism 221;

[0098] The sealing block 224 is slidably inserted into the guide groove 223 and is used to adjust the opening and closing state of the air outlet 222.

[0099] The sealing block 224 has a push rod 225 inserted inside, which is used to adjust the sealing state of the sealing block 224 to the air outlet 222.

[0100] A limiting sleeve 2251 is sleeved on the outside of the push rod 225. A pre-tightening spring 226 is sleeved on the outside of the push rod 225 and between the limiting sleeve 2251 and the sealing block 224, for pushing the sealing block 224 to move along the guide groove 223.

[0101] A top plate 2142 is connected to one side of the upper end of the mudguard 2141, and one end of the push rod 225 is connected to the top plate 2142.

[0102] The height of the top plate 2142 is equal to the height of the valve 34, so that when the side of the top plate 2142 contacts the valve 34, it can drive the valve 34 to compress the return spring 35, so that the through groove 341 is connected to the inside of the metering box 32.

[0103] As an improvement, such as Figures 2-3 As shown, the feeding unit 3 includes:

[0104] The pre-storage frame 31 is used to pre-store the sludge before drying;

[0105] The metering box 32 is connected to the discharge end of the pre-storage frame 31 and is used to guide the sludge in the pre-storage frame 31 into the extrusion assembly 21.

[0106] The guide plate 33 is located inside the metering box 32 at an upper position;

[0107] The valve 34 is slidably inserted into the guide plate 33 to separate the sludge in the pre-storage frame 31 and the metering box 32. The valve 34 has a through groove 341 inside to guide the sludge in the pre-storage frame 31 into the metering box 32.

[0108] A reset spring 35 is connected to one side of the valve 34 and inside the guide plate 33, and is used to reset the valve 34.

[0109] It should be noted that initially, the mud baffle 2141 blocks the feed port 2123, and the top plate 2142 pushes the valve 34, so that the reset spring 35 is in a compressed state, and the through groove 341 is connected with the inside of the quantitative tank 32, and the gas outlet 222 is closed by the sealing block 224. In use, the sludge is poured into the pre-storage frame 31, and the sludge at the bottom of the pre-storage frame 31 enters the quantitative tank 32 along the through groove 341 to fill the quantitative tank 32. The air cylinder 215 is started, and the air cylinder 215 drives the push plate 214 to move along the heating wall 2121 towards the air cylinder 215, and the push plate 214 drives the mud baffle 2141 to move, so that the feed port 2123 is in an open state. The sludge in the quantitative tank 32 enters the preheating tank 212, and at the same time, the mud baffle 2141 drives the top plate 2142 to move away from the valve 34, and the through groove 341 in the valve 34 is misaligned with the feed port 2123 of the quantitative tank 32 under the pushing force of the reset spring 35, so that the sludge in the pre-storage frame 31 cannot enter the preheating tank 212 at the same time, thereby achieving the effect of quantitative feeding of the secondary feeding, and avoiding the difficulty in controlling the preheating time of the preheating tank 212 due to excessive feeding each time;

[0110] At the same time that the mud baffle 2141 drives the top plate 2142 to move away from the valve 34, the top plate 2142 also drives the sealing block 224 to move along the guide groove 223 through the push rod 225, so that the gas outlet 222 is opened, and the sludge in the quantitative tank 32 enters the preheating tank 212 through the feed port 2123 for preliminary drying, and the water vapor evaporated during the drying process is discharged from the gas outlet 222;

[0111] Since the sludge before preliminary drying has a high overall water content, the heating rod 2122 is further arranged on the heating wall 2121, so that the heating rod 2122 synchronously performs heating and drying work on the sludge during the heating and drying process of the sludge by the heating wall 2121, so as to ensure that the sludge in the preheating tank 212 can increase the contact area with the heating area, realize synchronous drying of the sludge inside and outside, further accelerate the preliminary drying speed of the sludge, and make the sludge drying process more uniform;

[0112] After the sludge is preliminarily dried to be soft, the air cylinder 215 is started, the air cylinder 215 drives the push plate 214 to move along the inside of the heating wall 2121 to the discharge end of the preheating box 212, the push plate 214 drives the mud baffle 2141 to close the feeding port 2123, at the same time, the push plate 214 drives the top plate 2142 to move through the mud baffle 2141, the top plate 2142 pushes the sealing block 224 to close the air outlet 222 through the push rod 225 under the action of the pre-tightening spring 226, after the sealing block 224 closes the air outlet 222, when the push rod 225 continues to move, the push rod 225 moves relatively inside the sealing block 224, the limiting sleeve 2251 is gradually compressed, until the top plate 2142 drives the valve 34 to move along the inside of the guide plate 33, so that the through slot 341 is connected with the quantitative box 32, the sludge in the pre-storage frame 31 fills the quantitative box 32 again, the air cylinder 215 stops driving the push plate 214, and the push plate 214 is located at the position close to the mud outlet pipe 213 in the preheating box 212, so that the effect that the preliminarily dried sludge is automatically extruded and the automatic feeding is simultaneously realized is realized;

[0113] The present application connects the mud outlet pipe 213 at a position close to the discharge end of the preheating box 212, when the push plate 214 moves along the inside of the preheating box 212 to extrude the preliminarily dried sludge, the sludge after evaporation is evaporated due to a large amount of water, so that the liquid level of the sludge in the preheating box 212 is lower than the feeding position of the mud outlet pipe 213, with the gradual movement of the push plate 214, the liquid level of the sludge in the preheating box 212 gradually rises, until the liquid level reaches the discharge port of the mud outlet pipe 213, the sludge is continuously and uninterruptedly extruded along the mud outlet pipe 213, the sludge entering the slicing assembly 14 is continuous discharge, so that the sliced sludge is a complete compressed sheet, the space occupied by the dried sludge is reduced, the sludge dust in the drying process is reduced, and the subsequent bagging and transportation are facilitated;

[0114] As Figure 6As shown, the present application sets the slicing assembly 14 inside the rotary kiln 12, so that the surface of the receiving plate 143 also has the same heat as the inside of the rotary kiln 12 during the heating and drying process, and during the continuous discharge of sludge at the sludge outlet pipe 213, the driving motor in the extension plate 141 is started, which drives the slicing knife 144 to rotate through the driving shaft 142, and the slicing knife 144 cuts the sludge continuously discharged from the sludge outlet pipe 213, and the cut sludge falls onto the corresponding receiving plate 143 for further heating and drying, until the receiving plate 143 rotates to the material scraping plate 145, which scrapes the sludge pieces about to be dried from the receiving plate 143 to the rotary kiln 12 for complete drying, and finally, the completely dried sludge enters the collection box 13 for collection, avoiding the sludge with certain humidity being directly sliced and falling into the rotary kiln 12 and adhering to the inner wall of the rotary kiln 12, thereby achieving the purpose of avoiding the sludge directly adhering to the inner wall of the drying equipment during the drying process, effectively reducing the drying energy consumption and drying time.

[0115] It should be noted that the relational terms herein such as first and second, and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0116] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A sludge drying apparatus, characterized by, The device comprises: a drying unit (1) for drying the sludge; a preheating and pushing unit (2) arranged at the upper end of the drying unit (1) for preliminarily drying the sludge into a soft state and pushing it into the drying unit (1) for further drying; a feeding unit (3) arranged at the upper end of the preheating and pushing unit (2) for feeding the preheating and pushing unit (2); the drying unit (1) comprises: a slicing assembly (14) arranged at the feeding end of the drying unit (1) for cutting the wet soil continuously pushed by the preheating and pushing unit (2) into slices; the preheating and pushing unit (2) comprises: an extruding assembly (21) for preliminarily drying the sludge fed by the feeding unit (3) into wet soil and continuously extruding it; an air outlet assembly (22) arranged at the upper part of the extruding assembly (21) for discharging water vapor during the drying of the sludge by the extruding assembly (21); the extruding assembly (21) comprises: a second support (211); a preheating box (212) connected to the upper end of the second support (211) for heating the sludge to a soft state, the upper end of the preheating box (212) being provided with a feeding port (2123) for guiding the sludge in the feeding unit (3) into the preheating box (212); a sludge outlet pipe (213) connected to the upper position of the discharging end of the preheating box (212) for guiding the preliminarily dried sludge in the preheating box (212) to the slicing assembly (14); a heating wall (2121) arranged inside the preheating box (212) for buffering and preliminarily heating and drying the sludge; a push plate (214) slidingly inserted into the heating wall (2121) for extruding the preliminarily dried sludge in the heating wall (2121), the upper side of the push plate (214) being connected with a fender (2141) for closing the feeding port (2123) during the extrusion of the sludge in the preheating box (212); a pneumatic cylinder (215) connected to one end of the push plate (214) and extending outside the preheating box (212) for controlling the push plate (214) to move back and forth; a guide hole (2140) is arranged inside the push plate (214), a heating rod (2122) is inserted into the guide hole (2140) for heating and drying the sludge inside the heating wall (2121); one end of the heating rod (2122) is connected with the heating wall (2121), and the heat source extends from the preheating box (212) into the heating rod (2122).

2. The sludge drying device according to claim 1, wherein: the drying unit (1) comprises: a first support (11); a rotary kiln (12) mounted at the upper end of the first support (11) for drying the sludge cut by the slicing assembly (14); a collecting box (13) arranged at the discharging end of the rotary kiln (12) for collecting the dried sludge slices.

3. The sludge drying device according to claim 2, wherein: the slicing assembly (14) comprises: An extension plate (141) is connected to the upper end of the first support (11) and its side is located inside the rotary kiln (12); A driving shaft (142) is rotatably connected inside the extension plate (141); A receiving plate (143) is connected outside the driving shaft (142) and is used to receive the cut sludge pieces; A cutting knife (144) is connected outside the driving shaft (142) and above the receiving plate, which is used to cut the sludge extruded by the extrusion assembly (21); and A material scraping plate (145) is connected to the side of the extension plate (141) and its upper end is close to the upper surface of the receiving plate, which is used to scrape the sludge pieces on the receiving plate into the rotary kiln (12); The receiving plate (143) and the cutting knife (144) are provided with multiple sets and correspond one by one from top to bottom.

4. The sludge drying device according to claim 1, wherein: The air outlet assembly (22) comprises: An air valve mechanism (221) is connected to the upper end of the preheating box (212) and is used to control the connection state of the preheating process and the extrusion process of the preheating box (212) with the outside; An air outlet (222) is provided in the air valve mechanism (221) and is used to connect the inside of the preheating box (212) with the outside; A guide groove (223) is provided inside the air valve mechanism (221); A sealing block (224) is slidingly inserted into the guide groove (223) and is used to adjust the opening and closing state of the air outlet (222).

5. The sludge drying device according to claim 4, wherein: A push rod (225) is inserted into the sealing block (224) and is used to adjust the sealing state of the sealing block (224) to the air outlet (222); A limiting sleeve (2251) is provided outside the push rod (225), a pre-tightening spring (226) is provided outside the push rod (225) and between the limiting sleeve (2251) and the sealing block (224), which is used to push the sealing block (224) to move along the guide groove (223); A top plate (2142) is connected to one side of the upper end of the fender (2141), and one end of the push rod (225) is connected to the top plate (2142).

6. The sludge drying device according to claim 1, wherein: The feeding unit (3) comprises: A pre-storage frame (31) is used to pre-store the sludge before drying; A metering box (32) is connected to the discharge end of the pre-storage frame (31) and is used to guide the sludge in the pre-storage frame (31) into the extrusion assembly (21); A guide plate (33) is provided inside the metering box (32) at an upper position; A valve (34) is slidingly inserted into the guide plate (33) and is used to interval the sludge in the pre-storage frame (31) and the metering box (32), and a through groove (341) is provided inside the valve (34) and is used to guide the sludge in the pre-storage frame (31) into the metering box (32); A reset spring (35) is connected to one side of the valve (34) and is located inside the guide plate (33), which is used to reset the valve (34).

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