Sludge drying device

Abstract

The present invention discloses a sludge drying device, which relates to the technical field of sludge drying. The sludge drying device includes a chassis, and the chassis includes a drying chamber and a heat pump chamber located below the drying chamber. Among them, a heat pump is provided in the heat pump chamber, and a single-layer conveyor net for accommodating sludge is provided in the drying chamber. The heat pump unit is used to provide circulating high-temperature drying air in the drying chamber. A feeding assembly is further provided in the drying chamber, and the feeding assembly is used to convey the sludge on the single-layer conveyor net so that the sludge is dried by the high-temperature drying air during the conveying process. In this sludge drying device, the double-layer structure of the original conveyor belt for conveying sludge is replaced with a single-layer conveyor net. There are no obstacles below the single-layer conveyor net, and the high-temperature drying air can directly reach the single-layer conveyor net without being blocked by obstacles, reducing the resistance of the high-temperature drying air before reaching the sludge position, reducing the energy consumption of the high-temperature drying air, and improving the drying efficiency of the sludge.

Description

Technical Field

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

[0002] A sludge low-temperature dryer generally includes a mesh belt dryer and a heat pump unit. Using the principle of low-temperature heat pump dehumidification, it adopts a circulating hot air drying method to dehydrate and dry the wet sludge on the mesh belt. The low-temperature dryer has many advantages: through low-temperature treatment below 90°C, it effectively avoids the release of malodorous gases caused by the decomposition of organic matter, greatly reducing environmental pollution; the heat pump system efficiently recovers waste heat, not only reducing energy consumption, but also achieving the environmental protection effect of energy conservation and emission reduction; the efficient heat pump and sludge forming and cutting system ensure rapid dehydration of sludge, significantly shortening the treatment cycle; and it has excellent throughput and processing speed, meeting the high-efficiency treatment requirements of large sewage treatment plants.

[0003] When the existing sludge low-temperature dryer transports sludge, the mesh belt on it is generally in a rotating state, that is, the mesh belt rotates like a conveyor belt. The upper layer of the mesh belt can transport sludge, and the lower layer will also rotate to the upper layer to transport sludge as it rotates.

[0004] For example, a sludge low-temperature drying device proposed in the patent with the publication number CN118221335A uses a rotating conveyor mesh belt for feeding, and the hot air for high-temperature drying gradually flows upward from below the rotating conveyor mesh belt and dries the sludge during the flow.

[0005] Similar rotary low-temperature dryers as above have certain defects: the rotating mesh belt is divided into upper and lower layers with its own pulley as the boundary. Only the mesh belt above the pulley can transport sludge, and the mesh belt below the pulley cannot transport sludge and will also become an obstacle to prevent the high-temperature drying air below from directly entering the drying process, reducing the energy of the high-temperature drying air and resulting in a decrease in drying efficiency. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a sludge drying device, which solves the problem of the decrease in drying efficiency in the prior art.

[0007] To achieve the above object, the present invention is realized through the following technical solutions: A sludge drying device includes a machine case, and the machine case includes a drying chamber and a heat pump chamber located below the drying chamber; wherein, a heat pump is provided in the heat pump chamber, and a single-layer conveyor mesh for accommodating sludge is provided in the drying chamber. The heat pump unit is used to provide circulating high-temperature drying air in the drying chamber; a feeding component is further provided in the drying chamber, and the feeding component is used to transport the sludge on the single-layer conveyor mesh so that the sludge is dried by the high-temperature drying air during the transportation process.

[0008] Further, the feeding component includes sprockets which are arranged at the four corners, and a rotating shaft is provided between two sprockets on the same side. A transmission chain is connected between two opposite sprockets, and there is an assembly space between the two transmission chains. The single-layer transmission net is assembled on the transmission chain in a split manner. A towing shaft is rotatably installed on one side of the single-layer transmission net, and a free shaft is installed on the other side of the single-layer transmission net. Both the towing shaft and the free shaft are parallel to the axial direction of the sprockets, and both ends of the towing shaft are fixed on the opposite transmission chains. When the single-layer transmission net runs to the lower layer of the transmission chain, it can be in a vertical state due to its own weight, so that the single-layer transmission net on the lower layer of the transmission chain does not block the hot air below from entering the single-layer transmission net on the upper layer. At least two sets of conveying structures formed by the feeding component and the single-layer transmission net are provided. The lower conveying structure is used to receive and convey the sludge from the upper layer, extending the sludge drying time.

[0009] Further, the feeding component further includes brackets which are at least located on both sides within the assembly space, and the brackets are used to support the single-layer transmission net on the upper layer of the transmission chain, enabling the single-layer transmission net on the upper layer to maintain a horizontal state. The brackets are fixed on the inner wall of the chassis.

[0010] Further, the feeding component includes sprockets which are arranged at the four corners, and a rotating shaft is provided between two sprockets on the same side. A transmission chain is connected between two opposite sprockets, and there is an assembly space between the two transmission chains. The single-layer transmission net is located above the transmission chain and is fixed on the inner wall of the chassis through brackets. A leveling structure and a sludge pushing structure are provided between the two transmission chains on both sides. When the transmission chain rotates, the leveling structure is used to spread the sludge on the upper surface of the single-layer transmission net, and the sludge pushing structure is used to push away the sludge on the upper surface of the single-layer transmission net. At least two sets of conveying structures formed by the feeding component and the single-layer transmission net are provided. The lower conveying structure is used to receive and convey the sludge from the upper layer, extending the sludge drying time.

[0011] Further, the leveling structure includes: a first support rod which is fixed at the relative positions of the two transmission chains, and a connecting plate is fixed between the ends of the two first support rods away from the transmission chains; a comb tooth which is arranged in a linear matrix on the side of the connecting plate close to the assembly space. The lengths of the comb teeth on each leveling structure are different, enabling different leveling structures to spread the sludge to different degrees. The sludge pushing structure includes a second support rod which is fixed at the relative positions of the two transmission chains, and a pushing plate is fixed between the ends of the two second support rods away from the transmission chains. When the pushing plate rotates to the upper part of the transmission chain, the side close to the assembly space can contact the single-layer transmission net, and the heights of the pushing plates of each sludge pushing structure are different.

[0012] Further, the feeding assembly is a reel disposed on both sides inside the drying chamber. Both ends of the single-layer conveyor net are respectively wound around the reels on both sides, and the reels rotate forward and backward alternately; at least three sets of conveying structures formed by the single-layer conveyor net and the reels are provided.

[0013] Further, an inclined material guide plate is provided below the drying chamber, and both ends of the material guide plate protrude beyond both ends of the lowermost single-layer conveyor net, so that the material guide plate can receive materials from both ends of the single-layer conveyor net.

[0014] Further, a driving assembly for driving the feeding assembly to work is installed on one side of the chassis.

[0015] Further, the upper part inside the drying chamber is set as Air Duct 1, and one side of the drying chamber is provided with Air Duct 2 which is isolated from the drying chamber and communicated with Air Duct 1. Air Duct 1 and Air Duct 2 are used to send medium-temperature and high-humidity air back to the heat pump unit. A suction fan is provided between the drying chamber and the heat pump chamber, and the suction fan is used to send the high-temperature and dry air formed by the heat pump unit into the drying chamber.

[0016] Further, a sludge feed hopper is installed above the drying chamber, and a dried sludge discharge port is installed below one side of the drying chamber. The dried sludge discharge port is used to receive the materials sent out by the single-layer conveyor net below.

[0017] The present invention has the following beneficial effects: For this sludge drying device, the double-layer structure of the original conveyor belt for transporting sludge is replaced with a single-layer conveyor net. There are no obstacles below the single-layer conveyor net, and the high-temperature and dry air can directly reach the single-layer conveyor net without being blocked by obstacles, reducing the resistance of the high-temperature and dry air before reaching the sludge position, reducing the energy consumption of the high-temperature and dry air, and improving the drying efficiency of the sludge.

[0018] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the external view of the present invention;

[0020] Figure 2 is the front view of the internal structure of the first embodiment of the present invention;

[0021] Figure 3 is the front view of the cooperation between the single-layer conveyor net and the feeding assembly in the first embodiment of the present invention;

[0022] Figure 4 is the schematic diagram of the positions of two of the single-layer conveyor nets above and below the feeding assembly respectively in the first embodiment of the present invention;

[0023] Figure 5It is a mating diagram of a stainless steel braided mesh, a support shaft and a free shaft in Embodiment 1 of the present invention;

[0024] Figure 6 It is a rear perspective view in Embodiment 1 of the present invention;

[0025] Figure 7 It is a drive assembly diagram of Embodiment 1 and Embodiment 2 of the present invention;

[0026] Figure 8 It is a structural diagram of the heat pump unit of the present invention;

[0027] Figure 9 For the present invention Figure 8 Schematic diagram of the high-temperature drying air duct not assembled;

[0028] Figure 10 For the present invention Figure 9 Another perspective view;

[0029] Figure 11 It is a working principle diagram of the heat pump unit of the present invention;

[0030] Figure 12 For the present invention Figure 2 Schematic diagram of the internal structure without the single-layer conveyor net and the feeding assembly installed;

[0031] Figure 13 It is a front view of the internal structure of Embodiment 2 of the present invention;

[0032] Figure 14 It is a front view of the mating diagram of the single-layer conveyor net and the feeding assembly in Embodiment 2 of the present invention;

[0033] Figure 15 For the present invention Figure 14 Stereogram;

[0034] Figure 16 It is an upper perspective view of the single-layer conveyor net in Embodiment 2 of the present invention;

[0035] Figure 17 It is a lower perspective view of the single-layer conveyor net in Embodiment 2 of the present invention;

[0036] Figure 18 It is a schematic diagram of the leveling structure in Embodiment 2 of the present invention;

[0037] Figure 19 It is a schematic diagram of the mud pushing structure in Embodiment 2 of the present invention;

[0038] Figure 20 It is a front view of the internal structure of Embodiment 3 of the present invention;

[0039] Figure 21 It is a structural schematic diagram of the drive assembly in Embodiment 3 of the present invention.

[0040] In the figure, 100 is the body; 110 is the sludge feed hopper; 120 is the keel; 130 is the drying chamber; 131 is the first air duct; 132 is the second air duct; 140 is the dry mud discharge port; 150 is the heat pump chamber; 200 is the drive assembly; 210 is the drive motor; 220 is the steering gear set; 230 is the main gear; 240 is the belt drive structure; 300 is the single-layer conveyor net; 310 is the towing shaft; 320 is the free shaft; 400 is the feeding assembly; 410 is the leveling structure; 411 is the connecting plate; 412 is the comb teeth; 413 is the first support rod; 420 is the conveyor chain; 430 is the mud pushing structure; 431 is the pushing plate; 432 is the second support rod; 440 is the bracket; 450 is the sprocket; 460 is the bracket; 470 is the winding wheel; 500 is the exhaust fan; 600 is the heat pump unit; 610 is the compressor; 611 is the first refrigerant pipe; 620 is the condenser; 621 is the second refrigerant pipe; 630 is the medium-temperature and high-humidity air duct; 640 is the evaporator; 641 is the fourth refrigerant pipe; 642 is the drain pipe; 650 is the medium-temperature drying air duct; 660 is the high-temperature drying air duct; 670 is the expansion valve; 671 is the third refrigerant pipe. Detailed implementation manners

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0043] Next, refer to Figures 1 - 21 to describe the sludge drying device provided by the embodiments of the present invention.

[0044] Embodiment 1:

[0045] Please refer to Figure 1 and Figure 2As shown, an embodiment of the present invention provides a sludge drying device, including a body 100, a chassis being the main component, and universal wheels are assembled at the bottom of the chassis for easy movement. The chassis is actually made of a keel 120 and a stainless steel plate installed on the keel 120. The interior of the chassis includes a drying chamber 130 and a heat pump chamber 150 located below the drying chamber 130. A heat pump unit 600 is provided in the heat pump chamber 150, and a single-layer conveying net 300 for accommodating sludge is provided in the drying chamber 130. The heat pump unit 600 is limited to provide circulating high-temperature dry air to the drying chamber 130, so that the sludge on the single-layer conveying net 300 can receive the high-temperature dry air for drying operations.

[0046] In detail, a feeding assembly 400 is further provided in the drying chamber 130 , and the feeding assembly 400 is used to transport the sludge on the single-layer conveying net 300 , so that the sludge is dried by the high-temperature dry air during the transportation process.

[0047] Therefore, the sludge drying device provided in the embodiment of the present invention replaces the original double-layer structure of the conveyor belt for transporting sludge with a single-layer conveyor net 300, which can prevent the high-temperature dry air from being blocked by the lower layer, that is, when the single-layer conveyor net 300 is exposed to wind, there is no obstacle underneath it, thereby reducing the resistance of the high-temperature dry air before it reaches the sludge position, reducing the energy consumption of the high-temperature dry air, and improving the sludge drying efficiency.

[0048] In addition, the present invention is suitable for sludge filtered by a plate and frame filter press, and is easy to install, convenient and movable, can be used after being connected to electricity, has low energy consumption and electricity saving, operates fully automatically, does not require special personnel on duty, and is simple to operate and convenient to maintain.

[0049] In this embodiment, the feeding assembly 400 includes sprockets 450, which are arranged in four corners, and a rotating shaft is provided between the two sprockets 450 on the same side, and a transmission chain 420 is transmission-connected between the two opposite sprockets 450, that is, there are two separate chain transmission structures here, and there is an assembly space between the two groups of transmission chains 420, and this assembly space is used to assemble the single-layer transmission network 300.

[0050] It should be understood that the single-layer conveyor network 300 is assembled on the conveyor chain 420 in a split manner. Figures 3 - 5 As shown, it is easier to understand that the split single-layer conveying network 300 specifically refers to dividing the entire rotating conveying network in the prior art into multiple rectangular networks.

[0051] A drag shaft 310 is rotatably installed on one side of the single-layer conveyor net 300, and a free shaft 320 is installed on the other side of the single-layer conveyor net 300. Both the drag shaft 310 and the free shaft 320 are axially parallel to the sprocket 450. That is, when the drag shaft 310 is fixed, its two ends are fixed on the opposite conveyor chains 420, so that the single-layer conveyor net 300 can be dragged to move when the conveyor chains 420 rotate.

[0052] The free shaft 320 is essentially used to support the shape of the single-layer conveyor net 300 and has no mechanical connection with the conveyor chains 420.

[0053] Thus, when the entire single-layer conveyor net 300 runs to the lower layer of the conveyor chains 420, due to the self-weight of the single-layer conveyor net 300 and the free shaft 320, the entire single-layer conveyor net 300 can be in a vertical state, so that the single-layer conveyor net 300 on the lower layer of the conveyor chains 420 does not block the hot air below from entering the single-layer conveyor net 300 above. That is, the high-temperature drying air below the single-layer conveyor net 300 can pass through the sludge with little or no blockage, reducing the energy loss of the high-temperature drying air.

[0054] Preferably, at least two sets of conveying structures formed by the feeding assembly 400 and the single-layer conveyor net 300 are provided. The lower conveying structure is used to receive and convey the sludge from the upper layer, so as to extend the sludge drying time.

[0055] In addition, in order to enable the lower conveying structure to receive the sludge from the upper layer, a guide plate can be provided on the inner wall of the chassis to guide the upper sludge onto the lower conveying structure.

[0056] In the actual application scenario, in order to keep the entire single-layer conveyor net 300 in a horizontal state when it runs to the upper layer, the feeding assembly 400 here further includes a bracket 460. The bracket 460 is at least located on both sides of the assembly space (or a bracket 460 is also provided in the middle of the assembly space). The bracket 460 can support the single-layer conveyor net 300 on the upper layer of the conveyor chains 420, so that the single-layer conveyor net 300 on the upper layer can be kept in a horizontal state (the single-layer conveyor net 300 moves because the conveyor chains 420 rotate to drive the drag shaft 310 to move, and both the single-layer conveyor net 300 and the free shaft 320 are dragged by the drag shaft 310 on the bracket 460). In addition, the bracket 460 is fixed on the inner wall of the chassis.

[0057] Optionally, the single-layer conveyor net 300 in this embodiment is a metal punching net or a stainless steel woven net.

[0058] Combined Figure 6 and Figure 7 As shown, in addition, a driving assembly 200 for driving the feeding assembly 400 to work is installed on one side of the chassis.

[0059] In this embodiment, the driving assembly 200 includes a main gear 230 fixed to one end of the central axis of the sprocket 450, and two main gears 230 on the same side should mesh, so that the rotation directions of the upper and lower conveyor chains 420 are different. Therefore, the mud conveying direction of the lower set of conveying structures is opposite to that of the upper set of conveying structures; a driving motor 210 is installed above the chassis, and a steering gear set 220 is installed between the output shaft of the driving motor 210 and the central axis of the sprocket 450. Preferably, the steering gear set 220 includes a driving bevel gear fixed to the output shaft of the driving motor 210 and a driven bevel gear fixed to one end of the central axis of the sprocket 450, and the driving bevel gear and the driven bevel gear should mesh.

[0060] Alternatively, the driving assembly 200 in this embodiment can also be in other forms, as long as it can drive the central axes of the two sprockets 450 to rotate in opposite directions.

[0061] Combined Figure 1 and Figure 2 As shown, in this embodiment, in order to ensure that the high-temperature dry air generated by the heat pump unit 600 can circulate, so as to enable the internal air circulation in the chassis (the internal circulation can avoid the overflow of internal odors), an air duct 131 is provided above the drying chamber 130. The air duct 131 is used to receive the medium-temperature and high-humidity air after drying the sludge, and an air duct 132 is provided on one side of the drying chamber 130, which is isolated from the drying chamber 130 and communicated with the air duct 131 (the method adopted here is to equip a partition between the air duct 132 and the drying chamber 130 and seal the periphery of the partition to avoid the mixing of the air in the air duct 132 and the drying chamber 130). Therefore, the air duct 131 and the air duct 132 can send the medium-temperature and high-humidity air back to the heat pump unit 600, and the heat pump unit 600 can convert the medium-temperature and high-humidity air into high-temperature dry air again. A suction fan 500 is provided between the drying chamber 130 and the heat pump chamber 150. When the suction fan 500 works, it can send the high-temperature dry air formed by the heat pump unit 600 into the drying chamber 130 to dry the sludge, thus forming a complete internal circulation.

[0062] In addition, seal the air flow channel, fully enclosed dehumidification and drying, no tail gas, no odor, no odor emission, and no need for deodorization.

[0063] As Figures 8 - 10 shown, the heat pump unit 600 provided by the embodiment of the present invention includes a compressor 610, a condenser 620, an expansion valve 670 and an evaporator 640. The compressor 610 is fixed in the heat pump chamber 150, the condenser 620 is installed on the inner wall of the heat pump chamber 150, and the evaporator 640 is installed behind the chassis.

[0064] In addition, a drain pipe 642 is assembled on one side of the evaporator 640.

[0065] The working of the heat pump unit 600 will be described in detail below according to Figures 8 - 12 the following.

[0066] 1. Regarding the refrigerant cycle, a refrigerant pipe one 611 is assembled between the compressor 610 and the condenser 620, a refrigerant pipe two 621 is assembled between the condenser 620 and the expansion valve 670, a refrigerant pipe three 671 is assembled between the expansion valve 670 and the evaporator 640, and a refrigerant pipe four 641 is assembled between the evaporator 640 and the compressor 610. The moving path of the refrigerant is the evaporator 640, the refrigerant pipe four 641, the compressor 610, the refrigerant pipe one 611, the condenser 620, the refrigerant pipe two 621, the expansion valve 670, and the refrigerant pipe three 671.

[0067] 2. Regarding the air cycle, a medium-temperature and high-humidity air duct 630 is assembled between the air duct two 132 and the evaporator 640, a medium-temperature and dry air duct 650 is assembled between the evaporator 640 and the condenser 620, and a high-temperature and dry air duct 660 is assembled between the condenser 620 and the exhaust fan 500.

[0068] 3. When the heat pump unit 600 is working specifically, ① the medium-temperature and high-humidity air discharged from the air duct one 131 and the air duct two 132 enters the evaporator 640 through the medium-temperature and high-humidity air duct 630. At this time, the refrigerant (such as Freon) in the evaporator 640 is a low-temperature and low-pressure liquid refrigerant, which exchanges heat with the medium-temperature and high-humidity air in the evaporator 640. At this time, the low-temperature and low-pressure liquid refrigerant is converted into a high-temperature and low-pressure vapor, while the medium-temperature and high-humidity air is condensed when entering the evaporator 640, and the condensed water is discharged from the drain pipe 642, and the condensed air is medium-temperature and dry air; ② the high-temperature and low-pressure refrigerant reaches the compressor 610 through the refrigerant pipe four 641 and is compressed into a high-temperature and high-pressure vapor in the compressor 610. This high-temperature and high-pressure gas reaches the condenser 620 through the refrigerant pipe one 611 and is cooled and condensed into a high-pressure liquid in the condenser 620 by a low-temperature heat source (the low-temperature heat source refers to the medium-temperature and dry air formed after condensation in the evaporator 640, and the medium-temperature and dry air reaches the condenser 620 through the medium-temperature and dry air duct 650 in the evaporator 640). At this time, the medium-temperature and dry air in the condenser 620 forms high-temperature and dry air, and the high-pressure liquid refrigerant reaches the expansion valve 670 through the refrigerant pipe two 621, forming a low-temperature and low-pressure liquid refrigerant, and the low-temperature and low-pressure liquid refrigerant returns to the evaporator 640 again; ③ the high-temperature and dry air in the condenser 620 reaches the exhaust fan 500 through the high-temperature and dry air duct 660 and is transported to the drying chamber 130 by the exhaust fan 500.

[0069] In addition, in order to feed the sludge, a sludge feed hopper 110 is installed above the drying chamber 130. Preferably, a slicing machine is assembled in the sludge feed hopper 110 to make the sludge feed evenly. A dry mud discharge port 140 is installed below one side of the drying chamber 130, and the dry mud discharge port 140 is used to receive the materials sent out by the single-layer conveyor net 300 from below.

[0070] It should be noted that in this embodiment, as Figure 2 , the rotation direction of the upper set of conveyor chains 420 is counterclockwise, that is, when conveying materials, it conveys from right to left. Therefore, the sludge feed hopper 110 should be arranged on the right side so that the sludge enters the upper single-layer conveyor net 300 from the right side. Correspondingly, the lower set of conveyor chains 420 should rotate clockwise, so it receives materials from the left side and discharges materials from the right side. Correspondingly, the dry sludge discharge port 140 is installed on the right side of the chassis to facilitate discharging.

[0071] Embodiment 2:

[0072] Combined with Figures 13 - 17 shown, different from Embodiment 1, the feeding assembly 400 here includes sprockets 450. The sprockets 450 are arranged in a four-corner orientation, and there is a rotating shaft between two sprockets 450 on the same side. There is a transmission connection between two opposite sprockets 450 with a conveyor chain 420. There is an assembly space between the two conveyor chains 420. The single-layer conveyor net 300 is located above the conveyor chain 420, and the single-layer conveyor net 300 is fixed on the inner wall of the chassis through a bracket 440, that is, the single-layer conveyor net 300 in this embodiment is in a stationary state and directly receives the sludge from the sludge feed hopper 110. In order to realize the material transmission of the single-layer conveyor net 300, a leveling structure 410 and a sludge pushing structure 430 are provided between the two conveyor chains 420 on both sides. When the conveyor chain 420 rotates, the leveling structure 410 is used to spread the sludge on the upper surface of the single-layer conveyor net 300, and the sludge pushing structure 430 is used to push the sludge on the upper surface of the single-layer conveyor net 300 away.

[0073] Optionally, the single-layer conveyor net 300 is a metal punched plate or a stainless steel woven net.

[0074] In this implementation scheme, the reason for setting the leveling structure 410 is to prevent the sludge from piling up on the single-layer conveyor net 300 after feeding, that is, the leveling structure 410 can make the sludge after feeding evenly reach each position of the single-layer conveyor net 300, and the sludge pushing structure 430 is used to push the flattened sludge to a lower single-layer conveyor net 300.

[0075] It should be noted that there are at least two sets of conveying structures formed by the feeding assembly 400 and the single-layer conveyor net 300. The lower conveying structure is used to receive and convey the sludge from the upper layer to extend the sludge drying time.

[0076] Such as Figure 18As shown, more specifically, the leveling structure 410 includes a first support rod 413 and comb teeth 412. The first support rod 413 is fixed at opposite positions of two conveyor chains 420, and a connecting plate 411 is fixedly provided between the ends of the two first support rods 413 away from the conveyor chains 420. The comb teeth 412 are arranged in a linear matrix on the side of the connecting plate 411 close to the assembly space. When the conveyor chains 420 rotate, the comb teeth 412 above the conveyor chains 420 can spread the sludge, and the comb teeth 412 above the conveyor chains 420 will not block or will minimize the blockage of the high-temperature drying air.

[0077] In addition, the lengths of the comb teeth 412 on each group of leveling structures 410 are different, so that different leveling structures 410 flatten the sludge to different degrees, that is, this method can avoid pushing too much sludge at one time, only push part of the sludge each time, and reduce the force on the conveyor chains 420.

[0078] As Figure 19 shown, the sludge pushing structure 430 includes a second support rod 432. The second support rod 432 is fixed at opposite positions of two conveyor chains 420, and a push plate 431 is fixedly provided between the ends of the two second support rods 432 away from the conveyor chains 420. When the push plate 431 rotates to above the conveyor chains 420, the side close to the assembly space can contact the single-layer conveyor net 300, so as to be able to push the sludge on the upper surface of the single-layer conveyor net 300. Preferably, the heights of the push plates 431 of each group of sludge pushing structures 430 are different. The push plate 431 with a smaller height can only push the sludge at a lower position on the upper surface of the single-layer conveyor net 300, and the push plate 431 with a larger height can push the sludge in the width direction of the single-layer conveyor net 300. In this way of layered feeding, the sludge drying time can be extended.

[0079] Preferably, the two sides of the connecting plate 411 and the push plate 431 are inclined surfaces. When the connecting plate 411 reaches below the conveyor chains 420, its inclined surface can reduce the wind resistance and further reduce the energy consumption of the high-temperature drying air.

[0080] Embodiment 3:

[0081] As Figure 20 shown, the difference from the above two embodiments is that the feeding assembly 400 is a reel 470 provided on both sides inside the drying chamber 130. Both ends of the single-layer conveyor net 300 are respectively wound around the reels 470 on both sides. The reels 470 rotate forward and backward alternately, and at least three sets of conveying structures formed by the single-layer conveyor net 300 and the reels 470 are provided. For example, when Figure 20When the first-layer reel 470 rotates counterclockwise (the second-layer reel 470 rotates clockwise, and the third-layer reel 470 rotates counterclockwise), the reel 470 on the left side of the first layer winds up, and the reel 470 on the right side of the first layer unwinds. At this time, the single-layer conveyor net 300 is in a state of driving the material sludge to the left; when the unwinding of the single-layer conveyor net 300 on the right-side reel 470 of the first layer is completed, at this time, the unwinding of the left-side reel 470 of the second layer and the unwinding of the right-side reel 470 of the third layer are completed, and the driving assembly 200 starts to work in the reverse direction, so that the conveying directions of all the single-layer conveyor nets 300 are changed to the opposite of the original direction.

[0082] Preferably, infrared distance sensors are provided for the two reels 470 of the first layer in the chassis. When it is detected that the unwinding is completed, the driving assembly 200 is controlled to work in the reverse direction through the controller.

[0083] Preferably, an inclined material guide plate is provided below in the drying chamber 130, and both ends of the material guide plate protrude beyond both ends of the single-layer conveyor net 300 of the lowermost layer, so that the material guide plate can receive materials from both ends of the single-layer conveyor net 300.

[0084] As Figure 21 shown, it should be noted that the driving assembly 200 in this embodiment should be different from the driving assemblies 200 in the above two embodiments. The driving assembly 200 in this embodiment further includes a belt drive structure 240 in addition to the driving motor 210, the steering gear set 220, and the main gear 230. The belt drive structure 240 connects the central shafts of the two equal-height reels 470, so that the central shafts of the two equal-height reels 470 rotate at the same speed and in the same direction.

[0085] Optionally, the single-layer conveyor net 300 in this embodiment is a nylon net, a metal punching net, or a stainless steel woven net.

Claims

1. A sludge drying device, characterized in that: The machine case comprises a drying chamber (130) and a heat pump chamber (150) located below the drying chamber (130); The heat pump chamber (150) is provided with a heat pump, and the drying chamber (130) is provided with a single-layer conveying net (300) for accommodating sludge, and the heat pump unit (600) is used to provide circulating high-temperature dry air in the drying chamber (130); A feeding assembly (400) is also provided in the drying chamber (130), and the feeding assembly (400) is used to transport the sludge on the single-layer conveying net (300); The feeding assembly (400) comprises sprockets (450), the sprockets (450) are arranged in four corners, a rotating shaft is provided between two sprockets (450) on the same side, a transmission chain (420) is transmission-connected between two opposing sprockets (450), and an assembly space is provided between the two transmission chains (420); The single-layer conveying net (300) is assembled on the conveying chain (420) in a split manner, a drag shaft (310) is rotatably mounted on one side of the single-layer conveying net (300), and a free shaft (320) is mounted on the other side of the single-layer conveying net (300), the drag shaft (310) and the free shaft (320) are both parallel to the axial direction of the sprocket (450), and both ends of the drag shaft (310) are fixed on the opposite conveying chain (420), and when the single-layer conveying net (300) runs to the lower layer of the conveying chain (420), it can be in a vertical state due to its own weight, so that the single-layer conveying net (300) on the lower layer of the conveying chain (420) does not block the hot air below from entering the single-layer conveying net (300) on the upper layer; The conveying structure formed by the feeding assembly (400) and the single-layer conveying net (300) is provided with at least two groups, and the conveying structure of the lower layer is used to receive and convey the sludge from the upper layer.

2. The sludge drying device according to claim 1, characterized in that: The feeding assembly (400) further comprises a bracket (460), wherein the bracket (460) is located at least on two sides of the assembly space, and the bracket (460) is used to support the single-layer conveying net (300) on the upper layer of the conveying chain (420), so that the single-layer conveying net (300) on the upper layer can be kept in a horizontal state; The bracket (460) is fixed on the inner wall of the chassis.

3. The sludge drying device according to claim 1, characterized in that: The feeding assembly (400) comprises sprockets (450), the sprockets (450) are arranged in four corners, a rotating shaft is provided between two sprockets (450) on the same side, a transmission chain (420) is transmission-connected between two opposing sprockets (450), and an assembly space is provided between the two transmission chains (420); The single-layer conveying net (300) is located above the conveying chain (420), and the single-layer conveying net (300) is fixed to the inner wall of the chassis via a bracket (440); A smoothing structure (410) and a mud pushing structure (430) are provided between the conveying chains (420) on both sides; when the conveying chains (420) rotate, the smoothing structure (410) is used to spread the mud on the upper surface of the single-layer conveying net (300), and the mud pushing structure (430) is used to push away the mud on the upper surface of the single-layer conveying net (300); The conveying structure formed by the feeding assembly (400) and the single-layer conveying net (300) is provided with at least two groups, and the conveying structure of the lower layer is used to receive and convey the sludge from the upper layer.

4. The sludge drying device according to claim 3, characterized in that: The leveling structure (410) comprises: Support rod one (413), the support rod one (413) being fixed at positions opposite to the two conveying chains (420), and a connecting plate (411) being fixed between ends of the two support rods one (413) away from the conveying chains (420); Comb teeth (412), the comb teeth (412) being arranged in a linear matrix on a side of the connecting plate (411) close to the assembly space; The comb teeth (412) on each group of the smoothing structures (410) have different lengths, so that different smoothing structures (410) can smooth the sludge to different degrees; The mud pushing structure (430) comprises two support rods (432), wherein the two support rods (432) are fixed at positions relative to the two conveying chains (420), and a push plate (431) is fixed between the ends of the two support rods (432) away from the conveying chains (420). When the push plate (431) rotates to above the conveying chains (420), the side thereof close to the assembly space can contact the single-layer conveying net (300), and the heights of the push plates (431) of each group of mud pushing structures (430) are different.

5. The sludge drying device according to claim 1, characterized in that: The feeding assembly (400) is a reel (470) disposed on both sides of the drying chamber (130), and both ends of the single-layer conveying net (300) are respectively wound on the reels (470) on both sides, and the reels (470) rotate alternately forward and reverse; The conveying structure formed by the single-layer conveying net (300) and the roller (470) is provided with at least three groups.

6. The sludge drying device according to claim 5, characterized in that: An inclined material guide plate is provided at the bottom of the drying chamber (130), and both ends of the material guide plate protrude from both ends of the bottommost single-layer conveying net (300). The material guide plate can receive materials from both ends of the single-layer conveying net (300).

7. The sludge drying device according to any one of claims 1 to 6, characterized in that: A driving assembly (200) for driving a feeding assembly (400) to work is installed on one side of the chassis.

8. The sludge drying device according to claim 1, characterized in that: An air duct one (131) is provided at the top of the drying chamber (130), and an air duct two (132) is provided on one side of the drying chamber (130) and is isolated from the drying chamber (130) and communicated with the air duct one (131). The air duct one (131) and the air duct two (132) are used to send medium-temperature and high-humidity air back to the heat pump unit (600). An exhaust fan (500) is provided between the drying chamber (130) and the heat pump chamber (150), and the exhaust fan (500) is used to send high-temperature dry air generated by the heat pump unit (600) into the drying chamber (130).

9. The sludge drying device according to claim 1, characterized in that: A sludge feed hopper (110) is installed above the drying chamber (130), and a dry sludge discharge outlet (140) is installed below one side of the drying chamber (130). The dry sludge discharge outlet (140) is used to receive materials sent out from the single-layer conveying net (300) below.

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