Sludge drying device

Abstract

The invention discloses a sludge drying device, and relates to the technical field of sludge drying. The sludge drying device comprises a machine box, and the machine box comprises a drying cavity and a heat pump cavity located below the drying cavity; wherein a heat pump is arranged in the heat pump cavity, a single-layer conveying net used for containing sludge is arranged in the drying cavity, and the heat pump unit is used for providing circulating high-temperature dry air for the interior of the drying cavity; a feeding assembly is further arranged in the drying cavity and used for conveying the sludge on the single-layer conveying net, so that the sludge is dried by high-temperature dry air in the conveying process; according to the sludge drying device, a double-layer structure of an original conveying belt used for conveying sludge is replaced with the single-layer conveying net, no obstacle exists below the single-layer conveying net, high-temperature dry air can directly reach the single-layer conveying net without being blocked by the obstacle, the resistance of the high-temperature dry air before the high-temperature dry air reaches the sludge position is reduced, and the sludge drying effect is improved. The energy consumption of high-temperature dry air is reduced, and the drying efficiency of the sludge is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sludge drying, in particular to a sludge drying device. Background Art

[0002] Low-temperature sludge dryers usually include mesh belt dryers and heat pump units. They use the low-temperature heat pump dehumidification principle and a circulating hot air drying method to dehydrate and dry the wet sludge on the mesh belt. Low-temperature dryers have many advantages: low-temperature treatment below 90°C effectively avoids the release of odorous gases caused by the decomposition of organic matter, greatly reducing pollution to the environment; the heat pump system efficiently recycles waste heat, which not only reduces energy consumption, but also achieves 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, greatly shortening the treatment cycle; and it has excellent processing capacity and processing speed to meet the efficient processing needs of large sewage treatment plants.

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

[0004] For example, a sludge low-temperature drying device is proposed in the patent with publication number CN118221335A, which uses a rotating conveyor belt to feed the material. High-temperature dry hot air gradually flows upward from the bottom of the rotating conveyor belt to dry the sludge during the flow.

[0005] There are certain defects in the rotary low-temperature dryer similar to the above-mentioned one: the rotating mesh belt is divided into two layers, upper and lower, with its own pulley as the dividing line. Only the mesh belt above the pulley can transport sludge, while the mesh belt below the pulley cannot transport sludge. It will also become an obstacle that prevents the high-temperature dry air below from directly entering the drying area, thereby reducing the energy of the high-temperature dry air and causing 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 reduced drying efficiency in the prior art.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a sludge drying device, including a chassis, the chassis including 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 conveying net for accommodating sludge is provided in the drying chamber, and the heat pump unit is used to provide circulating high-temperature dry air in the drying chamber; a feeding assembly is also provided in the drying chamber, and the feeding assembly is used to transport the sludge on the single-layer conveying net so that the sludge is dried by the high-temperature dry air during the transportation process.

[0008] Furthermore, the feeding assembly includes sprockets, which are arranged in four corners, and a rotating shaft is provided between two sprockets on the same side, a conveying chain is transmission-connected between two opposite sprockets, and an assembly space is provided between the two conveying chains; the single-layer conveying net is assembled on the conveying chain in a split manner, a drag shaft is rotatably installed on one side of the single-layer conveying net, and a free shaft is installed on the other side of the single-layer conveying net, the drag shaft and the free shaft are both parallel to the axial direction of the sprocket, and both ends of the drag shaft are fixed on relative conveying chains, when the single-layer conveying net runs to the lower layer of the conveying chain, it can be in a vertical state due to its own weight, so that the single-layer conveying net on the lower layer of the conveying chain does not block the hot air below from entering the single-layer conveying net on the upper layer; the conveying structure formed by the feeding assembly and the single-layer conveying net 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, thereby extending the sludge drying time.

[0009] Furthermore, the feeding assembly also includes a bracket, which is located at least on both sides of the assembly space, and the bracket is used to support the single-layer conveying net on the upper layer of the conveying chain, so that the upper single-layer conveying net can remain in a horizontal state; the bracket is fixed on the inner wall of the chassis.

[0010] Furthermore, the feeding assembly includes sprockets, which are arranged in four corners, and a rotating shaft is provided between the two sprockets on the same side, a conveying chain is transmission-connected between the two opposite sprockets, and an assembly space is provided between the two conveying chains; the single-layer conveying net is located above the conveying chain, and the single-layer conveying net is fixed to the inner wall of the chassis through a bracket; a leveling structure and a mud pushing structure are provided between the conveying chains on both sides, and when the conveying chain rotates, the leveling structure is used to spread the sludge on the upper surface of the single-layer conveying net, and the mud pushing structure is used to push away the sludge on the upper surface of the single-layer conveying net; the conveying structure formed by the feeding assembly and the single-layer conveying net 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, thereby extending the sludge drying time.

[0011] Furthermore, the smoothing structure includes: a support rod, which is fixed at the relative position of the two conveying chains, and a connecting plate is fixed between the ends of the two support rods away from the conveying chains; comb teeth, which are 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 group of the smoothing structures are different, so that different smoothing structures can flatten the sludge to different degrees; the mud pushing structure includes a support rod, which is fixed at the relative position of the two conveying chains, and a push plate is fixed between the ends of the two support rods away from the conveying chains, and when the push plate rotates to the top of the conveying chain, its side close to the assembly space can contact the single-layer conveying net, and the height of the push plate of each group of mud pushing structures is different.

[0012] Furthermore, the feeding assembly is a reel arranged on both sides of the drying chamber, the two ends of the single-layer conveying net are respectively wound on the reels on both sides, and the reels rotate alternately forward and reverse; the conveying structure formed by the single-layer conveying net and the reels is provided with at least three groups.

[0013] Furthermore, an inclined material guide plate is provided at the bottom of the drying chamber, and both ends of the material guide plate protrude from both ends of the lowest single-layer conveying net, so that the material guide plate can receive materials from both ends of the single-layer conveying net.

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

[0015] Furthermore, an air duct one is provided at the top of the drying chamber, and an air duct two is provided on one side of the drying chamber, which is isolated from the drying chamber and connected to the air duct one. The air duct one and the air duct two are used to return the medium-temperature and high-humidity air to the heat pump unit. An exhaust fan is provided between the drying chamber and the heat pump chamber, and the exhaust fan is used to deliver the high-temperature dry air formed by the heat pump unit into the drying chamber.

[0016] Furthermore, a sludge feed hopper is installed above the drying chamber, and a dry sludge discharge outlet is installed below one side of the drying chamber, and the dry sludge discharge outlet is used to receive the material sent out from the single-layer conveying net below.

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

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an appearance diagram of the present invention; Figure 2 This is a front view of the internal structure of the first embodiment of the present invention; Figure 3 This is a front view of the cooperation between the single-layer conveyor network and the feeding assembly in the first embodiment of the present invention; Figure 4 It is a schematic diagram of the position of two single-layer conveyor nets respectively located above and below the feeding component in the first embodiment of the present invention; Figure 5 This is a diagram showing the matching of the stainless steel braided mesh, the supporting shaft and the free shaft in the first embodiment of the present invention; Figure 6 This is a rear perspective view in the first embodiment of the present invention; Figure 7 It is a diagram of the driving components of the first and second embodiments of the present invention; Figure 8 It is a structural diagram of the heat pump unit of the present invention; Fig. 9 For the present invention Figure 8 Schematic diagram of the unassembled high temperature drying air duct; Fig.10 For the present invention Fig. 9 Another perspective of the picture; Fig.11 This is a working principle diagram of the heat pump unit of the present invention; Fig.12 For the present invention Figure 2 Schematic diagram of the internal structure without installing the single-layer conveyor network and feeding components; Fig.13 This is a front view of the internal structure of the second embodiment of the present invention; Fig.14 This is a front view of the coordination diagram of the single-layer conveyor network and the feeding assembly in the second embodiment of the present invention; Fig.15 For the present invention Fig.14 Stereoscopic image of Fig.16 This is a top view of a single-layer transmission network in Embodiment 2 of the present invention; Fig.17 This is a bottom perspective view of a single-layer transmission network in Embodiment 2 of the present invention; Fig.18 It is a schematic diagram of the leveling structure in the second embodiment of the present invention; Fig.19 It is a schematic diagram of the mud pushing structure in the second embodiment of the present invention; Fig. 20 This is a front view of the internal structure of the third embodiment of the present invention; Fig.21 This is a schematic diagram of the structure of the driving component in the third embodiment of the present invention.

[0020] In the figure, 100, machine body; 110, sludge feed hopper; 120, keel; 130, drying chamber; 131, air duct 1; 132, air duct 2; 140, dry sludge discharge port; 150, heat pump chamber; 200, drive assembly; 210, drive motor; 220, steering gear set; 230, main gear; 240, belt transmission structure; 300, single-layer transmission net; 310, drag shaft; 320, free shaft; 400, feeding assembly; 410, leveling structure; 411, connecting plate; 412, comb teeth; 413, support rod 1; 42 0. Conveyor chain; 430. Mud pushing structure; 431. Push plate; 432. Support rod 2; 440. Bracket; 450. Sprocket; 460. Bracket; 470. Reel; 500. Exhaust fan; 600. Heat pump unit; 610. Compressor; 611. Refrigerant pipe 1; 620. Condenser; 621. Refrigerant pipe 2; 630. Medium temperature and high humidity air duct; 640. Evaporator; 641. Refrigerant pipe 4; 642. Drain pipe; 650. Medium temperature and dry air duct; 660. High temperature and dry air duct; 670. Expansion valve; 671. Refrigerant pipe 3. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating 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 therefore should not be understood as limiting the present invention.

[0023] Refer to the following Figure 1-Figure 21 The sludge drying device provided in an embodiment of the present invention is described.

[0024] Embodiment 1: See also 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] It should be understood that the single-layer conveyor network 300 is assembled on the conveyor chain 420 in a split manner. Figure 3-Figure 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.

[0030] 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. The drag shaft 310 and the free shaft 320 are both parallel to the axial direction of the sprocket 450, that is, when the drag shaft 310 is fixed, its two ends are fixed on the relative conveyor chains 420, so that when the conveyor chain 420 rotates, the single-layer conveyor net 300 can be dragged to move by the drag shaft 310.

[0031] The free shaft 320 is essentially used to support the shape of the single-layer conveying network 300 , and it has no mechanical connection with the conveying chain 420 .

[0032] Therefore, when the entire single-layer conveyor net 300 runs to the lower layer of the conveyor chain 420, due to the deadweight of the single-layer conveyor net 300 and the free axis 320, the entire single-layer conveyor net 300 can be in a vertical state, so that the single-layer conveyor net 300 at the lower layer of the conveyor chain 420 does not block the hot air below from entering the single-layer conveyor net 300 at the upper layer, so that the high-temperature dry air below the single-layer conveyor net 300 can pass through the sludge without or with little obstruction, thereby reducing the energy loss of the high-temperature dry air.

[0033] Preferably, 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, thereby being able to prolong the sludge drying time.

[0034] In addition, in order to enable the lower conveying structure to receive the sludge on the upper layer, a guide plate may be provided on the inner wall of the chassis to guide the sludge on the upper layer to the lower conveying structure.

[0035] In actual application scenarios, 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 also includes a bracket 460, which is located at least on both sides of the assembly space (or the bracket 460 is also set in the middle of the assembly space), and the bracket 460 can support the single-layer conveyor net 300 on the upper layer of the conveyor chain 420, so that the single-layer conveyor net 300 on the upper layer can maintain a horizontal state (the movement of the single-layer conveyor net 300 is due to the rotation of the conveyor chain 420 to drive the drag shaft 310 to move, and the single-layer conveyor net 300 and the free shaft 320 are both dragged by the drag shaft 310 on the bracket 460). In addition, the bracket 460 is fixed to the inner wall of the chassis.

[0036] Optionally, the single-layer transmission mesh 300 in this embodiment is a metal perforated mesh or a stainless steel woven mesh.

[0037] Combination 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.

[0038] In this embodiment, the driving assembly 200 includes a main gear 230 fixed to one end of the axis of the sprocket 450, and the two main gears 230 on the same side should be meshed, so that the rotation directions of the upper and lower conveying chains 420 are different, so the mud delivery direction of the lower group of conveying structures is opposite to the mud delivery direction of the upper group of conveying structures; a driving motor 210 is installed above the chassis, and a steering gear group 220 is installed between the output shaft of the driving motor 210 and the axis of the sprocket 450. Preferably, the steering gear group 220 includes an active umbrella wheel fixed on the output shaft of the driving motor 210 and a driven umbrella wheel fixed to one end of the axis of the sprocket 450, and the active umbrella wheel and the driven umbrella wheel should be meshed.

[0039] Alternatively, the driving assembly 200 in this embodiment may also be in other forms, as long as it is a structure that can drive the central axes of the two sprockets 450 to rotate in opposite directions.

[0040] Combination 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 make the air in the chassis circulate internally (internal circulation can prevent the internal odor from overflowing), the upper part of the drying chamber 130 is set as an air duct 131, and the air duct 131 is used to receive the medium-temperature and high-humidity air after the sludge has been dried, and an air duct 2 132 is provided on one side of the drying chamber 130, which is isolated from the drying chamber 130 and connected to the air duct 1 131 (the method adopted here is to equip a partition between the air duct 2 132 and the drying chamber 130, and the partition is The four sides of the air duct 132 are sealed to avoid mixing of the air in the air duct 132 with the air in the drying chamber 130), so the air duct 1 131 and the air duct 2 132 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. An exhaust fan 500 is provided between the drying chamber 130 and the heat pump chamber 150. When the exhaust fan 500 is working, the high-temperature dry air formed by the heat pump unit 600 can be sent into the drying chamber 130 to dry the sludge, thereby forming a complete internal circulation.

[0041] In addition, the air flow channel is sealed to achieve fully enclosed dehumidification and drying, with no tail gas, no odor, no odor emission, and no need for deodorization.

[0042] like Figure 8-Figure 10 As shown, the heat pump unit 600 provided in 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 cavity 150, the condenser 620 is installed on the inner wall of the heat pump cavity 150, and the evaporator 640 is installed at the rear of the chassis.

[0043] In addition, a drain pipe 642 is assembled at one side of the evaporator 640 .

[0044] According to the following Figure 8-Figure 12 The operation of the heat pump unit 600 is described in detail.

[0045] 1. Regarding the circulation of the refrigerant, refrigerant tube one 611 is assembled between the compressor 610 and the condenser 620, refrigerant tube two 621 is assembled between the condenser 620 and the expansion valve 670, refrigerant tube three 671 is assembled between the expansion valve 670 and the evaporator 640, and refrigerant tube four 641 is assembled between the evaporator 640 and the compressor 610. The movement path of the refrigerant is the evaporator 640, refrigerant tube four 641, compressor 610, refrigerant tube one 611, condenser 620, refrigerant tube two 621, expansion valve 670, and refrigerant tube three 671.

[0046] 2. Regarding air circulation, a medium-temperature and high-humidity air duct 630 is assembled between the air duct 132 and the evaporator 640, a medium-temperature dry air duct 650 is assembled between the evaporator 640 and the condenser 620, and a high-temperature dry air duct 660 is assembled between the condenser 620 and the exhaust fan 500.

[0047] 3. When the heat pump unit 600 is working, ① the medium-temperature and high-humidity air discharged from the air duct 1 131 and the air duct 2 132 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 high-temperature and low-pressure steam, and the medium-temperature and high-humidity air is condensed when entering the evaporator 640. The condensed water is discharged from the drain pipe 642, and the condensed air is medium-temperature dry air; ② The high-temperature and low-pressure refrigerant reaches the compressor 610 from the refrigerant pipe 4 641 and is compressed into high-temperature and high-pressure steam. The high-temperature and high-pressure gas passes through the refrigerant pipe 641. 11 reaches the condenser 620, and is cooled and condensed into a high-pressure liquid by a low-temperature heat source in the condenser 620 (the low-temperature heat source refers to the medium-temperature dry air formed after condensation in the evaporator 640, and the medium-temperature dry air reaches the condenser 620 through the medium-temperature dry air duct 650 in the evaporator 640). At this time, the medium-temperature dry air reaching the condenser 620 forms high-temperature dry air, and the high-pressure liquid refrigerant reaches the expansion valve 670 through the refrigerant pipe 621 to form a low-temperature and low-pressure liquid refrigerant, and the low-temperature and low-pressure liquid refrigerant returns to the evaporator 640; ③ The high-temperature dry air in the condenser 620 reaches the exhaust fan 500 through the high-temperature dry air duct 660, and is transported to the drying chamber 130 by the exhaust fan 500.

[0048] In addition, in order to feed the sludge, a sludge feeding hopper 110 is installed above the drying chamber 130. Preferably, a strip cutter is assembled in the sludge feeding hopper 110 to feed the sludge evenly. A dry mud discharge outlet 140 is installed at the lower side of the drying chamber 130. The dry mud discharge outlet 140 is used to receive the material sent out from the single-layer conveying net 300 below.

[0049] It is worth noting that, in this embodiment, Figure 2 The upper group of conveyor chains 420 rotates counterclockwise, that is, it conveys materials from right to left, so the sludge feed hopper 110 should be set on the right side to allow the sludge to enter the upper single-layer conveyor net 300 from the right side. The corresponding lower group of conveyor chains 420 should rotate clockwise, so it receives materials from the left and discharges them on the right side. The corresponding dry mud discharge port 140 is installed on the right side of the chassis to facilitate discharge.

[0050] Embodiment 2: Combination Figure 13-Figure 17 As shown, different from the first embodiment, the feeding assembly 400 here 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 conveying chain 420 is transmission-connected between the two opposite sprockets 450, and an assembly space is provided between the two conveying chains 420, and 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 through a bracket 440, that is, the single-layer conveying net 300 in this embodiment is in a stationary state, and it directly receives the sludge from the sludge feed hopper 110, in order to realize the material transmission of the single-layer conveying net 300, a leveling structure 410 and a mud pushing structure 430 are provided between the conveying chains 420 on both sides, when the conveying chain 420 rotates, the leveling structure 410 is used to spread the sludge on the upper surface of the single-layer conveying net 300, and the mud pushing structure 430 is used to push away the sludge on the upper surface of the single-layer conveying net 300.

[0051] Optionally, the single-layer transmission net 300 is a metal perforated plate or a stainless steel woven net.

[0052] In this embodiment, the smoothing structure 410 is provided to prevent the sludge from accumulating on the single-layer conveying net 300 after being fed, that is, the smoothing structure 410 can make the sludge after feeding evenly reach various positions of the single-layer conveying net 300, and the mud pushing structure 430 is used to push the flattened sludge to a single-layer conveying net 300 below.

[0053] It is worth noting that 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, thereby prolonging the sludge drying time.

[0054] like Fig.18As shown, in more detail, the smoothing structure 410 includes a support rod 413 and comb teeth 412, the support rod 413 is fixed at the relative positions of the two conveying chains 420, and a connecting plate 411 is fixed between the ends of the two support rods 413 away from the conveying chains 420, and the comb teeth 412 are arranged in a linear matrix on one side of the connecting plate 411 close to the assembly space. When the conveying chain 420 rotates, the comb teeth 412 above the conveying chain 420 can spread the sludge, and the comb teeth 412 above the conveying chain 420 will not block or minimize the blocking of the high-temperature dry air.

[0055] In addition, the comb teeth 412 on each set of smoothing structures 410 have different lengths, so that different smoothing structures 410 can flatten the sludge to different degrees. That is, this method can avoid pushing too much sludge at one time, so that only part of the sludge is pushed each time, reducing the force on the conveying chain 420.

[0056] like Fig.19 As shown, the mud pushing structure 430 includes two support rods 432, and the two support rods 432 are fixed at the relative positions of 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 chain 420. When the push plate 431 rotates to the top of the conveying chain 420, the side close to the assembly space can contact the single-layer conveying net 300, so as to push the sludge on the upper surface of the single-layer conveying net 300. Preferably, the push plates 431 of each group of mud pushing structures 430 have different heights. The push plates 431 with a smaller height can only push the sludge at a lower position on the upper surface of the single-layer conveying net 300, and the push plates 431 with a larger height can push all the sludge in the width direction of the single-layer conveying net 300. This layered pushing method can extend the sludge drying time.

[0057] Preferably, both sides of the connecting plate 411 and the pushing plate 431 are inclined surfaces. When the connecting plate 411 reaches below the conveying chain 420, its inclined surface can reduce wind resistance and further reduce energy consumption of high-temperature dry air.

[0058] Embodiment three: like Fig. 20 As shown, the difference from the above two embodiments is that the feeding assembly 400 is a reel 470 arranged on both sides of the drying chamber 130, and the two 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, and the conveying structure formed by the single-layer conveying net 300 and the reels 470 is provided with at least three groups. Fig. 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 is wound up, and the reel 470 on the right side of the first layer is unwound. At this time, the single-layer conveyor net 300 is in a state of driving the material sludge to the left; when the single-layer conveyor net 300 on the right side reel 470 of the first layer is unwound, at this time, the unwinding of the left side reel 470 of the second layer and the right side reel 470 of the third layer are completed, and the driving component 200 starts to work in reverse, so that the conveying direction of all single-layer conveyor nets 300 is changed to be opposite to the original direction.

[0059] Preferably, an infrared distance measuring sensor is provided for the two reels 470 of the first layer in the chassis, and when it is detected that the unwinding is completed, the driving assembly 200 is controlled by the controller to work in the reverse direction.

[0060] Preferably, 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 lowest single-layer conveying net 300 , so that the material guide plate can receive materials from both ends of the single-layer conveying net 300 .

[0061] like Fig.21 As shown, it should be noted that the drive assembly 200 in this embodiment should be distinguished from the drive assembly 200 in the above two embodiments. In addition to the drive motor 210, the steering gear set 220 and the main gear 230, the drive assembly 200 in this embodiment also includes a belt transmission structure 240. The belt transmission structure 240 connects the central axes of two equal-height reels 470 so that the central axes of the two equal-height reels 470 rotate at the same speed and in the same direction.

[0062] Optionally, the single-layer transmission net 300 in this embodiment is a nylon net, a metal perforated 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).

2. 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 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.

3. The sludge drying device according to claim 2, 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.

4. 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.

5. The sludge drying device according to claim 4, 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.

6. 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.

7. The sludge drying device according to claim 6, 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).

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

9. 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).

10. 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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