Sludge drying equipment with reverse conditioning lock control

Abstract

The invention discloses sludge drying equipment with a reverse conditioning lock control function. The sludge drying equipment with the reverse conditioning lock control function comprises a machine shell, and a coaxial linkage assembly, a conditioning drying unit and a heat exchange condensation assembly are arranged in the machine shell; the coaxial linkage assembly comprises a main shaft which is horizontally and rotatably arranged and a motor which is in driving connection with the main shaft; the tempering and drying unit comprises a tempering pre-dehydration assembly and a gradient drying reaction regulation and control assembly which are sequentially arranged in the axial direction of the main shaft; working parts of the tempering pre-dehydration assembly and the gradient drying reaction regulation and control assembly are coaxially and fixedly connected with the main shaft; the air inlet end of the heat exchange condensation assembly is communicated with the air outlet end of the gradient drying reaction regulation and control assembly. According to the sludge drying equipment with the reverse hardening and tempering locking control function, colloid is precisely separated through three-stage fractional condensation, self-adaptive matching of the front procedure and the rear procedure is achieved through main shaft linkage, the problem of colloid enrichment in condensate water recycling is fundamentally solved, it is guaranteed that water circulation is long-acting and stable, and the practical requirements of construction scenes are met.

Description

Technical Field

[0001] This invention belongs to the field of green construction technology in building engineering, specifically, it relates to a sludge drying device with reverse conditioning and locking control. Background Technology

[0002] With the continuous improvement of green construction systems in building engineering, the reduction and disposal of solid waste and the recycling of water resources throughout the construction process have become core mandatory indicators for environmental management of engineering projects. Construction processes such as foundation pit excavation, vehicle washing, site dust suppression, and concrete curing continuously generate large amounts of high-silicate yellow sludge, primarily composed of silicate minerals such as kaolinite and illite, and highly alkaline due to the mixing of cement hydration products. This type of sludge has high water content, large volume, and is prone to secondary pollution, making it a key target for environmental management at construction sites. Sludge drying, as a core process for the reduction, harmlessness, and resource utilization of this type of sludge, can significantly reduce sludge volume through dewatering, lowering the difficulty and cost of off-site transportation and disposal. The condensate generated during the drying process can also be reused for site washing and dust suppression spraying, making it crucial for constructing a closed-loop water recycling system at construction sites. It is currently widely used in various housing and municipal infrastructure projects. Existing technologies for treating this type of sludge generally adopt a linear series mode of "independent front-end conditioning and pre-dewatering + independent back-end sludge drying". Through independent front-end conditioning, thickening and pre-dewatering processes, the moisture content of the sludge is adjusted to the range suitable for the drying equipment, and then sent to the back-end drying equipment to complete deep dewatering. At the same time, the drying condensate is directly reused in the front-end wastewater treatment process, thus forming a closed loop of construction water circulation, which meets the water resource reuse requirements of green construction.

[0003] However, in practical engineering applications, the aforementioned linear series mode, when operating for extended periods, commonly suffers from the core technical problem of poor long-term stability of the front-end sludge-water separation system. Specifically, after a period of condensate reuse, the front-end sludge-water separation process frequently experiences complete flocculant failure and a precipitous drop in sludge-water separation efficiency. Even with significantly increased flocculant dosage and replacement with different types of flocculants, effective dense flocs cannot be formed, leading to a sharp increase in suspended solids in the supernatant of the sedimentation tank, complete loss of sludge-water separation efficiency, and ultimately, complete paralysis of the entire construction site's water circulation system, failing to achieve the closed-loop water resource reuse required for green construction. Conventional solutions for this phenomenon focus on optimizing the sludge-water separation process and routine condensate purification, such as adjusting flocculant dosage, increasing reagent dosage, optimizing sedimentation tank structural parameters, extending hydraulic retention time, or adding multi-stage filtration and sedimentation devices before condensate reuse. However, these methods cannot fundamentally solve the problem; they only temporarily alleviate the surface symptoms, and the same problem recurs after continuous condensate reuse.

[0004] Existing research on this problem mainly focuses on emergency treatment of surface phenomena, with little systematic analysis of its underlying mechanisms. The core cause of the problem remains unaddressed: the combined effect of the inherent material properties of high-silicate yellow mud sludge and the inherent defects of existing linear series separation methods. During the drying process, the silicate minerals within the high-silicate yellow mud sludge undergo continuous dissolution and molecular-level condensation reactions under strongly alkaline and humid conditions, generating in-situ nanoscale hydrophobic silica colloids. These colloids are not conventional suspended solid particles but rather uniformly dispersed in the condensate as stable hydrosols with extremely strong Brownian motion. Conventional filtration devices struggle to effectively intercept them, allowing them to continuously enter the front-end water circulation system and accumulate. The accumulated silica colloids rapidly adsorb onto the surface of the sludge particles, forming a dense hydrophobic passivation film that completely shields the active sites on the sludge particle surface. This prevents flocculants from effectively bridging and flocculating with the sludge particles, ultimately leading to the complete failure of the front-end sludge-water separation system.

[0005] This problem is common and recurring in domestic housing construction and municipal infrastructure projects. It not only causes serious waste of water resources at construction sites and significantly increases the cost of sludge treatment agents and equipment operation and maintenance, but also directly leads to the sticking of drying equipment walls and the clogging of filter screens, as well as the failure of on-site spraying, flushing pipelines and supporting equipment. At the same time, it causes the stagnation of core construction processes such as car washing and earthwork operations, disrupts the normal construction rhythm on site, and even leads to environmental problems such as illegal discharge of sewage and failure to meet dust control standards. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a sludge drying device with reverse conditioning lock control.

[0007] To achieve the aforementioned objectives, the technical solution adopted by this invention includes: The housing contains a coaxial linkage assembly, a conditioning and drying unit, and a heat exchange and condensation assembly. The coaxial linkage assembly includes a horizontally rotating main shaft and a motor driven by the main shaft. The conditioning and drying unit includes a conditioning pre-dehydration assembly and a gradient drying reaction control assembly arranged sequentially along the main shaft axis. The working parts of both the conditioning pre-dehydration assembly and the gradient drying reaction control assembly are coaxially and securely connected to the main shaft. The air inlet of the heat exchange and condensation assembly is connected to the air outlet of the gradient drying reaction control assembly. The heat exchange condensation assembly includes an integrally enclosed stepped plate frame. The stepped plate frame has a stepped series arrangement of a primary high-temperature condensation chamber, a secondary medium-temperature condensation chamber, and a tertiary low-temperature condensation chamber. The height of the three condensation chambers decreases progressively. Each condensation chamber has an independent drainage structure at its bottom. The drainage structure of the secondary medium-temperature condensation chamber is connected to a reverse conditioning component. The outlet of the reverse conditioning component extends into the conditioning and pre-dehydration component. The reverse conditioning component is coupled with the main shaft drive to synchronize the condensate addition with the drying conditions.

[0008] In this invention, by integrating a coaxial linkage assembly, a conditioning and drying unit, a heat exchange and condensation component, and a reverse conditioning component, synchronous driving of the entire process of conditioning, pre-dehydration, and drying is achieved through a single main shaft. The whole machine has a compact structure and high integration, adapting to the flexible relocation needs of construction sites. Through the three-stage stepped condensation chamber with graded condensation and independent drainage design, the precise separation of harmful colloids and beneficial active colloids is achieved, fundamentally solving the problem of colloid enrichment caused by condensate reuse. With the help of the reverse conditioning component that works in conjunction with the main shaft drive, the drying conditions are adaptively and rigidly matched to the front-end conditioning process, completely solving the inherent defects of the disconnect between the front and back-end processes in the existing linear series mode, and greatly improving the long-term stability of the equipment and the long-term effectiveness of water recycling.

[0009] Preferably, the gradient drying reaction control component includes a pre-drying chamber, a constant temperature control chamber, and a balanced discharge chamber arranged sequentially along the main shaft axis. Adjacent chambers are separated by partition plates, and a dynamic sealing structure is provided between the partition plates and the main shaft. An arc-shaped opening for material to pass through is provided at the bottom of the partition plates.

[0010] In this invention, by defining the specific structure of the gradient drying reaction control component, including three chambers arranged sequentially along the main axis, a partition plate with a driving sealing structure, and a bottom arc-shaped discharge port, the three independent chambers can respectively realize the pre-drying, constant temperature deep drying, and cooling discharge of sludge, forming a gradient drying mode with progressively decreasing temperature, which is suitable for the drying characteristics of highly viscous yellow mud sludge and avoids problems such as wall sticking, sludge clogging, and secondary moisture re-moistening of the discharged material; the dynamic sealing structure of the partition plate can block the hot air flow between the chambers, ensuring an independent temperature environment for each chamber; the bottom arc-shaped port corresponds to the discharge end of the propeller blade, which can ensure that the material passes smoothly and sequentially through each drying chamber along the discharge direction, realizing the continuous and stable operation of the sludge drying process.

[0011] Preferably, the pre-drying chamber, the constant temperature control chamber, and the balanced discharge chamber are respectively coaxially and fastened with a spiral pusher blade, a spiral reaction blade, and a spiral discharge blade; the air inlet pipe of the pre-drying chamber and the constant temperature control chamber is located at the material inlet end of the chamber body, and the air outlet branch pipe is located at the material outlet end of the chamber body; the air inlet pipe of the balanced discharge chamber is located at the material outlet end of the chamber body, and the air outlet branch pipe is located at the material inlet end of the chamber body.

[0012] In this invention, by defining the propeller blade structure and the arrangement of the inlet and outlet air ducts in each drying chamber, propeller blades with different structures can be adapted to the moisture content characteristics of the sludge in each chamber, achieving stable material conveying and full material turning, enhancing the contact efficiency between sludge and hot air, and improving the drying effect. The pre-drying chamber and the constant temperature control chamber adopt a co-current ventilation design, which allows high-temperature hot air to fully contact the sludge with high moisture content, quickly reducing the moisture content of the sludge. The balanced discharge chamber adopts a counter-current ventilation design, which allows room temperature cold air to fully exchange heat with the dried sludge, achieving rapid cooling of the sludge, avoiding secondary moisture re-wetting during discharge, and maximizing the utilization rate of thermal energy, meeting the requirements of green construction and energy saving.

[0013] Preferably, the pre-drying chamber, the constant temperature control chamber, and the balanced discharge chamber are all equipped with anti-blocking right-angle plates. The anti-blocking right-angle plates are located directly below the inlets of the air inlet pipe and the air outlet branch pipe. The vertical plate is perpendicular to the material travel direction, and the horizontal plate surface is parallel to the corresponding pipe inlet with a gap for air passage.

[0014] In this invention, by limiting the installation position and structural form of the anti-blocking right-angle plate, the anti-blocking right-angle plate can prevent the sludge and mud splashed up by the propeller blades from directly entering the air vent, while not affecting the normal entry and exit of hot air. This fundamentally avoids the problems of air vent blockage and pipe scaling, ensures the long-term stable operation of the hot air circulation system, reduces the frequency of equipment downtime maintenance, and lowers operation and maintenance costs.

[0015] Preferably, the heat exchange condensation assembly further includes a refrigerant plate frame corresponding to the three condensation chambers. The refrigerant plate frame and the stepped plate frame together form a refrigerant channel. The refrigerant inlet pipe of the refrigerant channel is located on the side corresponding to the third-stage low-temperature condensation chamber, and the refrigerant outlet pipe is located on the side corresponding to the first-stage high-temperature condensation chamber, forming a counter-current heat exchange structure.

[0016] In this invention, by defining the refrigerant channel through a counter-current heat exchange design, the low-temperature refrigerant enters from the corresponding side of the three-stage low-temperature condensing chamber, opposite to the flow direction of the humid and hot exhaust gas. This allows the coldest refrigerant to form the maximum heat exchange temperature difference with the lowest-temperature exhaust gas, maximizing the condensation heat exchange efficiency. At the same time, the refrigerant temperature gradually increases along the flow direction, which perfectly matches the temperature range requirements of the first-stage high-temperature condensing chamber, the second-stage medium-temperature condensing chamber, and the third-stage low-temperature condensing chamber, which gradually decreases. This ensures the temperature accuracy of the staged condensation and reduces the energy consumption of the equipment.

[0017] Preferably, baffles are fixed in the primary high-temperature condensing chamber, the secondary medium-temperature condensing chamber, and the tertiary low-temperature condensing chamber. The baffles are arranged alternately in the upper and lower parts to form an S-shaped airflow path in the condensing chamber.

[0018] In this invention, by limiting the arrangement of baffles in the condensing chamber, the staggered baffles can form an S-shaped airflow path in the condensing chamber, which greatly extends the residence time of the hot and humid exhaust gas in the condensing chamber, enhances the heat exchange effect between the exhaust gas and the refrigerant channel, ensures that colloids at different temperature ranges can be accurately condensed and separated in the corresponding condensing chamber, and improves the accuracy and separation effect of staged condensation.

[0019] Preferably, the reverse conditioning component includes a recovery hopper, a flow stabilizer cup, and a gravity-fed drain pipe. The recovery hopper is sealed and connected to the recovery port of the secondary medium-temperature condensing chamber. The flow stabilizer cup is inverted inside the recovery hopper. The inlet end of the gravity-fed drain pipe extends into the interior of the flow stabilizer cup, and the outlet end extends into the conditioning chamber of the conditioning and pre-dehydration component.

[0020] In this invention, by defining the specific structure of the reverse conditioning component, the recovery hopper can stably receive the condensate containing active colloids condensed in the secondary medium-temperature condensation chamber. The inverted flow stabilizing cup can ensure that the condensate forms a stable liquid level, guaranteeing that the inlet end of the gravity drainage pipe is always submerged in the condensate, thus avoiding the intake of air and affecting the stability of the return flow. The gravity drainage pipe uses gravity to directly return the active colloid condensate to the front-end conditioning chamber without the need for additional power. The structure is simple and the operation is stable, enabling the precise reuse of active colloids and improving the sludge conditioning and dewatering performance.

[0021] Preferably, the flow stabilizing cup has an overflow port, and a vertically movable counterweight plate is inserted into the overflow port. The counterweight plate is connected to a driven rod, and a cam is coaxially fastened to the main shaft. The cam abuts against the driven rod and is used to control the opening and closing of the overflow port by rotating the main shaft.

[0022] In this invention, by defining the linkage structure between the overflow port and the main shaft cam, the on / off frequency of the overflow port can be synchronously controlled by the rotation of the main shaft. The main shaft speed is determined by the drying conditions. When the drying load increases, the main shaft speed decreases, the on / off frequency of the overflow port decreases synchronously, and the condensate return flow rate decreases accordingly. When the drying conditions are stable, the main shaft maintains the rated speed, the overflow port is opened and closed at the rated frequency, and the condensate returns at the rated flow rate. Ultimately, a rigid synchronous match between the condensate dosage and the drying treatment volume is achieved, completely solving the problem of abnormal colloid formation caused by the disconnection of the front and back end processes and fluctuations in operating conditions.

[0023] Preferably, the conditioning and pre-dehydration assembly includes a conditioning chamber and a dehydration chamber that are interconnected. The conditioning chamber is coaxially and fastened with stirring blades, and the dehydration chamber is coaxially and fastened with spiral extrusion blades. The bottom of the dehydration chamber is provided with a filter plate with filter holes.

[0024] In this invention, by defining the specific structure of the conditioning and pre-dewatering component, the stirring blades in the conditioning chamber can fully shear and stir the sludge, and complete the sludge conditioning in conjunction with the returned active colloidal condensate, thereby improving the sludge dewatering performance; the spiral extrusion blades in the dewatering chamber can continuously spirally extrude and dewater the conditioned sludge, and the dewatered water is directly discharged after being filtered by the filter plate, without entering the water recycling system, thus avoiding harmful impurities in the squeezed water from entering the recycling stage, and further ensuring the long-term stability of water recycling.

[0025] Preferably, the stirring blade is provided with a large-lead smooth spiral blade at one end near the feed hopper of the conditioning chamber, and the single-turn conveying capacity of the large-lead smooth spiral blade is inversely matched with the rated processing capacity of the drying chamber.

[0026] In this invention, by limiting the large-lead spiral blade structure at the feed end of the stirring blade, the single-turn conveying capacity is inversely matched with the rated processing capacity of the drying chamber. The feed rate of the conditioning chamber can be directly locked by the spindle speed. When the drying load in the drying chamber increases and the spindle speed decreases, the feed conveying capacity of the blade decreases synchronously. This avoids the upstream feed rate from exceeding the processing capacity of the drying chamber from a mechanical perspective, and eliminates the problems of insufficient sludge drying and excessive dissolution of silicate minerals caused by excessive feed. This achieves reverse locking of the feed rate by the drying conditions and further strengthens the adaptive matching of the upstream and downstream processes.

[0027] Compared with the prior art, the advantages of the present invention include: (1) The sludge drying equipment with reverse conditioning and locking provided by the present invention achieves precise separation of harmful hydrophobic silica colloids and beneficial active colloids through the graded condensation design of the three-stage condensation chamber and the independent drainage structure of each chamber. Only the active colloid condensate in the secondary medium-temperature condensation chamber is directionally recycled to the front-end conditioning process through the reverse conditioning component. This solves the inherent industry problem of silica colloid enrichment, flocculant failure and complete paralysis of sludge-water separation system caused by the full recycling of drying condensate in the prior art. It realizes the long-term stable closed-loop recycling of construction water.

[0028] (2) The sludge drying equipment with reverse conditioning lock control provided by the present invention, through the transmission cooperation between the reverse conditioning component and the drying main shaft, synchronously controls the amount of active condensate added with the main shaft speed as the linkage reference, realizing the adaptive rigid matching of the back-end drying process to the front-end conditioning process, completely solving the inherent defects of the disconnect between the front and back-end processes and the fluctuation of the working conditions caused by the linear series mode of independent front-end conditioning and independent back-end drying in the existing technology, eliminating the cause of abnormal colloid formation from the mechanical structure, and greatly improving the long-term stability of the equipment and the long-term effectiveness of water recycling. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is an overall schematic diagram of a sludge drying device with reverse conditioning lock control according to the present invention; Figure 2 This is a schematic diagram of the internal structure explosion effect of a sludge drying device with reverse conditioning lock control according to the present invention; Figure 3 This is a schematic diagram of the structure of the stirring blade in this invention; Figure 4 This is a schematic diagram of the oil seal structure in this invention; Figure 5 This is a schematic diagram of the structure of the filter plate in this invention; Figure 6 This is a schematic diagram of the structure of the spiral extrusion blade in this invention; Figure 7 This is a schematic diagram of the piping distribution of the heat exchange and condensation assembly in this invention; Figure 8 This is a schematic diagram of the spiral propeller blade in this invention; Figure 9 This is a schematic diagram of the partition plate in this invention; Figure 10 This is a schematic diagram of the structure of the spiral reaction blade in this invention; Figure 11 This is a schematic diagram of the structure of the left-handed helical blade in this invention; Figure 12 This is a schematic diagram of the heat exchange and condensation assembly in this invention; Figure 13 This is a schematic diagram of the reverse conditioning component in this invention; Figure 14 This is a schematic diagram of the anti-blocking right-angle plate in this invention.

[0031] Figure label: 1. Housing; 2. Coaxial linkage assembly; 21. Spindle; 22. Motor; 3. Conditioning and drying unit; 31. Conditioning and pre-dehydration assembly; 311. Conditioning bin; 312. Feed hopper; 313. Agitator blade; 314. Short rod; 315. Annular baffle; 316. Oil seal; 317. Ribs; 318. Feed port; 319. Dehydration bin; 3110. Screw extrusion blade; 3111. Filter plate; 3112. Drain pipe; 32. Gradient drying reaction control component; 321. Pre-drying chamber; 322. Constant temperature control chamber; 323. Balanced discharge chamber; 324. Partition plate; 325. Spiral pusher blade; 326. Spiral reaction blade; 327. Spiral discharge blade; 3271. Left-hand spiral blade; 328. Discharge port; 329. Anti-clogging right-angle plate; 4. Heat exchange condensing assembly; 41. Zoned closed-loop heat pump heat exchanger unit; 42. Air inlet duct; 43. Air outlet branch duct; 44. Air outlet main duct; 45. Stepped plate and frame; 46. Primary high-temperature condensing chamber; 47. Secondary medium-temperature condensing chamber; 48. Tertiary low-temperature condensing chamber; 49. Baffle plate; 410. Waste liquid discharge pipe; 411. Recovery port; 412. Recovery hopper; 413. Refrigerant plate and frame; 414. Refrigerant passage; 415. Refrigerant inlet pipe; 416. Refrigerant outlet pipe; 5. Reverse conditioning assembly; 51. Flow stabilizer cup; 52. Self-weight drain pipe; 53. Overflow port; 54. Counterweight plate; 55. Driven rod; 56. Cam; 57. Guide rod. Detailed Implementation

[0032] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0033] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made on the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0035] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0036] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0037] The present invention aims to introduce and explain the structural composition of a sludge drying device with reverse conditioning and locking control, as well as the coordination relationship between the various components. Unless otherwise specified, the dimensions, materials, and manufacturing processes of the various components in the sludge drying device with reverse conditioning and locking control in the present invention can be selected according to specific circumstances, and no special limitations or explanations are made here.

[0038] Furthermore, to provide the public with a better understanding of the present invention, certain specific details are described in detail in the following description of the invention. However, those skilled in the art will fully understand the invention even without these detailed descriptions.

[0039] Example 1 Please see Figure 1 and Figure 2 This embodiment discloses a sludge drying device with reverse conditioning lock control, including a housing 1. The housing 1 is provided with a coaxial linkage assembly 2. The coaxial linkage assembly 2 includes a main shaft 21 that is horizontally rotated in the housing 1 along the discharge direction. A motor 22 is fixedly connected to one side of the housing 1. The drive end of the motor 22 is fixedly connected to the main shaft 21.

[0040] It should be noted that bearing support seats with sealing structures are provided at both ends of the main shaft 21 and at the compartment partition for radial support and axial positioning of the main shaft 21, ensuring that the main shaft 21 rotates synchronously and stably with all coaxial blades.

[0041] Please see Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 14 This embodiment discloses a sludge drying device with reverse conditioning lock control, including conditioning and drying unit 3.

[0042] Furthermore, the conditioning and drying unit 3 includes a conditioning and pre-dehydration component 31 and a gradient drying reaction control component 32.

[0043] Specifically, the conditioning and pre-dehydration assembly 31 includes a stirring conditioning structure and a screw extrusion pre-dehydration structure. The stirring conditioning structure includes a conditioning chamber 311 with an internal diameter of D1. One end of the conditioning chamber 311 is closed, and the other end is open. A shaft hole for the main shaft 21 to pass through is provided in the middle of the conditioning chamber 311. A feed hopper 312 is fixedly connected to the top of the conditioning chamber 311 and communicates with the interior of the conditioning chamber 311. A stirring blade 313 is rotatably connected inside the conditioning chamber 311 and is coaxially connected to the main shaft 21. An annular partition 315 is fixedly connected to the open end of the conditioning chamber 311. The inner diameter of the annular partition 315 is D2, where D1=D2. An oil seal 316 is connected to the middle of the partition 315. Four ribs 317 are fixedly connected to the outer ring of the oil seal 316, and the ribs 317 are fixedly connected to the annular partition 315. The outer ring of the oil seal 316, the ribs 317, and the annular partition 315 enclose each other to form multiple feed ports 318 for the conditioned sludge to pass through. The inner ring of the oil seal 316 is fixedly connected to the main shaft 21. The oil seal 316 adopts a bidirectional sealing structure, which at the same time prevents the sludge and water in the conditioning chamber 311 from entering the shaft hole of the main shaft 21. The feed ports 318 are axially corresponding to the feed end of the screw extrusion blade 3110. The conditioned sludge directly enters the pushing area of ​​the screw extrusion blade 3110 through the feed ports 318.

[0044] It should be noted that the impeller blade of the stirring blade 313 is generally toothed with a small lead and strong shearing. The end of the stirring blade 313 near the feed hopper 312 is provided with two toothless, wide-bladed, large-lead smooth spiral blades, and a short rod 314 is fixedly connected to the stirring blade 313. The outlet end of the gravity drainage pipe 52 extends to the corresponding area of ​​the toothed strong shearing blade in the conditioning chamber 311, so that the returned active colloidal condensate directly enters the sludge strong shearing mixing zone and fully contacts the sludge to complete the conditioning.

[0045] The single-cycle conveying capacity of the two modified blades is strictly calculated and locked in reverse according to the rated maximum heat load and processing capacity of the drying chamber. When the main shaft 21 reaches the rated maximum speed, the maximum feed rate is exactly equal to the rated maximum processing capacity of the drying chamber, thus locking the upper limit of the feed rate from the mechanical source.

[0046] Furthermore, the spiral extrusion pre-dehydration structure includes a dehydration chamber 319 with an inner diameter of D3, where D1=D2=D3. The dehydration chamber 319 is fixedly connected to an annular partition 315. A spiral extrusion blade 3110 is rotatably connected inside the dehydration chamber 319 and coaxially connected to the main shaft 21. The gap between the conditioning chamber 311 and the stirring blade 313 is E1, and the gap between the dehydration chamber 319 and the spiral extrusion blade 3110 is E2, where E2<E1. A filter plate 3111 is fixedly connected to the bottom of the side of the water tank 319 away from the conditioning tank 311. The length of the filter plate 3111 is one-third of the length of the dewatering tank 319. Its axial position corresponds to the discharge section of the screw extrusion blade 3110. Multiple filter holes are opened through the filter plate 3111. A recycling tank for receiving water is opened inside the housing 1. A drain pipe 3112 connected to the recycling tank is fixedly connected to the housing 1. The water outlet of the drain pipe 3112 is directly discharged and does not enter the water recycling system.

[0047] Furthermore, the gradient drying reaction control component 32 adopts a gradient drying mode with progressively decreasing temperature. The hot air temperature in the pre-drying chamber 321 is 100~120℃, and the material temperature inside the chamber is stable at 80~90℃. The hot air temperature in the constant temperature control chamber 322 is 80~90℃, and the material temperature inside the chamber is stable at 60~70℃. The balanced discharge chamber 323 is vented with ambient temperature cold air, and the material discharge temperature inside the chamber is ≤40℃, which is suitable for the drying characteristics of high viscosity yellow mud and avoids sticking to the wall, smearing, and secondary moisture re-moistening of the discharged material.

[0048] Specifically, the gradient drying reaction control component 32 includes a pre-drying chamber 321, a constant temperature control chamber 322, and a balanced discharge chamber 323 connected in sequence. Three partition plates 324 are inserted into the main shaft 21. The dehydration chamber 319 is fixedly connected to the pre-drying chamber 321 via partition plates 324. The pre-drying chamber 321 is fixedly connected to the constant temperature control chamber 322 via partition plates 324. The constant temperature control chamber 322 is fixedly connected to the balanced discharge chamber 323 via partition plates 324. The pre-drying chamber 321, the constant temperature control chamber 322, and the balanced discharge chamber 323, each enclosed by the corresponding partition plates 324, form an independent closed cavity. Each partition plate 324 is connected to the main shaft. All joints of 21 are equipped with dynamic sealing structures with wear-resistant bushings to prevent hot air leakage between chambers; the arc-shaped opening at the bottom of the partition plate 324 corresponds axially to the discharge end of the propeller blade in the corresponding chamber, ensuring that the material passes through each drying chamber in sequence along the discharge direction; the balanced discharge chamber 323 is a structure with one end open and the other end closed, and its open end is fixedly connected to the partition plate 324; the pre-drying chamber 321 and the constant temperature control chamber 322 are both tube structures with both ends through; the three partition plates 324 and the balanced discharge chamber 323 are all provided with shaft holes through which the main shaft 21 passes; the bottom of the three partition plates 324 is provided with arc-shaped openings through which the arc-shaped openings are used for material discharge.

[0049] Furthermore, a spiral pusher blade 325 is rotatably connected inside the pre-drying chamber 321. The spiral pusher blade 325 is coaxially and tightly connected to the main shaft 21. The spiral pusher blade 325 is a smooth spiral with equal pitch. Every turn of the blade has two wide arc-shaped rounded corner notches. The sludge entering the pre-drying chamber 321 has a high moisture content and is extremely sticky. Using a smooth spiral with small notches allows for gentle turning of the sludge, which can allow the sludge to come into contact with the hot air without throwing the high-moisture sludge onto the chamber wall to form a crust. The constant temperature control chamber 322 is rotatably connected to a spiral reaction blade 326, which is coaxially and tightly connected to the main shaft 21. The spiral reaction blade 326 is a double-headed continuous spiral with equal pitch and the blades have a slight backward tilt angle. A set of material turning notches is set every two turns of blades. While achieving stable material conveying, it also enhances the full contact between the material and the hot air, prolongs the residence time of the material in the constant temperature drying zone, and achieves deep and uniform drying.

[0050] A spiral discharge blade 327 is rotatably connected inside the balanced discharge bin 323. The spiral discharge blade 327 is coaxially and tightly connected to the main shaft 21. A discharge port 328 is opened at the bottom of the balanced discharge bin 323. It should be noted that the stirring blade 313, the spiral extrusion blade 3110, the spiral pushing blade 325, the spiral reaction blade 326, and the spiral discharge blade 327 are all right-hand spiral blades. A left-hand spiral blade 3271 is provided at one end of the spiral discharge blade 327 near the discharge port 328. The left-hand spiral blade 3271 is used to block material and prevent material spurting, so that the discharge port 328 can discharge material smoothly.

[0051] Please see Figure 12 and Figure 13 This embodiment discloses a sludge drying device with reverse conditioning and locking control, including a heat exchange and condensation assembly 4, which includes a matching heat exchange structure and a graded cryogel treatment structure.

[0052] Furthermore, the supporting heat exchange structure includes a partitioned closed-loop heat pump heat exchanger unit 41, model WLFS~RH800WD~FL, which is fixedly connected inside the casing 1. This three-loop compact high-temperature closed-loop heat pump is a compact integrated unit that can meet the extreme water discharge requirements. It is small in size and controllable in weight. All components of the whole machine can be integrated on a heavy-duty skid frame welded from steel profiles. Four sets of heavy-duty solid rubber wheels are installed at the bottom of the frame, which can be flexibly transferred within the construction site and between projects by forklifts and tractors without the need for fixed civil engineering foundations. The unit has three completely independent refrigerant heat exchange branches, which respectively support the different temperature requirements inside the pre-drying chamber 321, the constant temperature control chamber 322, and the balanced discharge chamber 323. Each branch is equipped with an independent electronic expansion valve, plate heat exchanger, temperature sensor, humidity sensor, and variable frequency circulating fan. There are no shared heat exchange core components, ensuring that the temperature and humidity of each branch are completely independent and controllable.

[0053] Specifically, air inlet pipes 42 are fixedly installed on the top of the pre-drying chamber 321 and the constant temperature control chamber 322 near the feeding direction, and on the top of the balanced discharge chamber 323 near the discharge direction. The air inlet pipes 42 are internally connected to the partitioned closed-loop heat pump heat exchanger unit 41. Air outlet branch pipes 43 are fixedly installed on the top of the pre-drying chamber 321 and the constant temperature control chamber 322 near the discharge direction, and on the top of the balanced discharge chamber 323 near the feeding direction. The three air outlet branch pipes 43 are connected to a main air outlet pipe 44.

[0054] It should be noted that two anti-blocking right-angle plates 329 are fixed in the pre-drying chamber 321, the constant temperature control chamber 322, and the balanced discharge chamber 323. The vertical plates of the anti-blocking right-angle plates 329 are welded and fixed to the inner wall of the chamber, and are distributed directly below the top of the inner cavity of the chamber where the air inlet pipe 42 and the air outlet branch pipe 43 are located. The vertical plates of the anti-blocking right-angle plates 329 are perpendicular to the material travel path, and the horizontal plate surface is parallel to the opening of the corresponding air inlet pipe 42 and the air outlet branch pipe 43, with a gap for air passage. The anti-blocking right-angle plates 329 in the balanced discharge chamber 323 are mirror-fitted to the position of the counter-flow air outlet, and the installation rules are completely consistent with the first two chambers. The anti-blocking right-angle plates 329 can prevent the sludge and mud splashed up by the propeller blades from directly entering the air outlet, while not affecting the normal entry and exit of hot air, thus avoiding air outlet blockage and pipe scaling from the root.

[0055] Furthermore, the graded cryogenic gel treatment structure includes an integrally enclosed stepped plate frame 45. The main air outlet 44 is connected to the interior of the stepped plate frame 45. The interior space of the stepped plate frame 45 is divided into a primary high-temperature condensing chamber 46, a secondary medium-temperature condensing chamber 47, and a tertiary low-temperature condensing chamber 48 according to their height. The temperature control target of the primary high-temperature condensing chamber 46 is 70~80℃. The hot air inside the main air outlet 44 first enters the primary high-temperature condensing chamber 46. Two baffles 49 are fixedly connected inside the primary high-temperature condensing chamber 46. The first baffle 49 is close to the air inlet, and its top is welded and fixed to the top wall of the primary high-temperature condensing chamber 46, while its bottom has an air passage gap with the bottom of the chamber. The second baffle 49 is close to the air outlet of the chamber, and its bottom is welded and fixed to the bottom of the chamber, while its top has an air passage gap with the top wall. The top of the partition between the primary high-temperature condensing chamber 46 and the secondary medium-temperature condensing chamber 47 has a narrowed air passage. After being guided by the baffles 49, the hot air enters the secondary medium-temperature condensing chamber 47 from the primary high-temperature condensing chamber 46 through this air passage. The end of the exhaust pipe 44 is connected to the air inlet of the first-stage high-temperature condensing chamber 46 of the stepped plate frame 45. The exhaust gas after staged condensation and dehumidification flows back from the air outlet of the third-stage low-temperature condensing chamber 48 to the partitioned closed-loop heat pump heat exchanger unit 41. After being heated, it is sent back to each drying chamber through the air inlet pipe 42 to form a closed hot air circulation loop.

[0056] The secondary medium-temperature condensing chamber 47 has a strictly locked temperature of 45~55℃, and its interior is equipped with four staggered baffles 49, forcing air to follow an S-shaped path to ensure uniform temperature within the chamber and stable condensation of active colloids. The tertiary low-temperature condensing chamber 48 has a temperature control target of 35~40℃. The bottom walls of the primary high-temperature condensing chamber 46, the secondary medium-temperature condensing chamber 47, and the tertiary low-temperature condensing chamber 48 are all equipped with a drainage slope of 3~5°, sloping towards the water inlet troughs at the bottom of the corresponding chambers. The three water inlet troughs are arranged along the slope of the chambers and are not interconnected. The ends of the water inlet troughs in the primary high-temperature condensing chamber 46 and the tertiary low-temperature condensing chamber 48... Both chambers are connected to waste liquid discharge pipes 410. The condensed waste liquid in both chambers is guided by the water inlet trough and then discharged directly through the waste liquid discharge pipes 410. The end of the water inlet trough of the secondary medium-temperature condensing chamber 47 is provided with a recovery port 411. The bottom of the recovery port 411 is fixedly connected to a bottom-sealed recovery hopper 412. The connection between the recovery hopper 412 and the secondary medium-temperature condensing chamber 47 is sealed by welding to ensure the negative pressure sealing of the condensing chamber. The condensate containing layered silicate clay mineral colloid in the secondary medium-temperature condensing chamber 47 is guided by the water inlet trough from the recovery port 411 into the recovery hopper 412 for storage.

[0057] Furthermore, a refrigerant plate frame 413 is fixedly connected to the top of the stepped plate frame 45. The refrigerant plate frame 413 and the stepped plate frame 45 together form a single integral refrigerant channel 414. The refrigerant channel 414 adopts a counter-current heat exchange design. A refrigerant inlet pipe 415 is fixedly connected to the side near the third-stage low-temperature condensing chamber 48, and a refrigerant outlet pipe 416 is fixedly connected to the side near the first-stage high-temperature condensing chamber 46. Both the refrigerant inlet pipe 415 and the refrigerant outlet pipe 416 are connected to the interior of the partitioned closed-loop heat pump heat exchanger unit 41. The three independent refrigerant heat exchange branches of the partitioned closed-loop heat pump heat exchanger unit 41 achieve independent and precise temperature control for the first-stage high-temperature condensing chamber 46, the second-stage medium-temperature condensing chamber 47, and the third-stage low-temperature condensing chamber 48, respectively. This forms a synergistic match with the counter-current heat exchange structure of the single refrigerant channel 414, ensuring both heat exchange efficiency and meeting the temperature range requirements for staged condensation.

[0058] Please see Figure 13 This embodiment discloses a sludge drying device with reverse conditioning lock control, including a reverse conditioning component 5.

[0059] Specifically, the reverse conditioning component 5 includes a flow stabilizer cup 51 inverted inside the recovery hopper 412. The open end of the flow stabilizer cup 51 faces downward, and a water passage gap is left between the edge of the open end and the inner wall of the recovery hopper 412. The cup body of the flow stabilizer cup 51 is welded and fixed to the inner wall of the recovery hopper 412 by a fixing rib. A gravity drainage pipe 52 is fixedly connected inside the recovery hopper 412. The water inlet end of the gravity drainage pipe 52 passes through the closed top wall of the flow stabilizer cup 51 and extends into the interior of the flow stabilizer cup 51. The water outlet end of the gravity drainage pipe 52 extends into the interior of the conditioning chamber 311. The height of the end of the gravity drainage pipe 52 inside the flow stabilizer cup 51 is higher than that of the end inside the conditioning chamber 311, so that the condensate water containing layered silicate clay mineral colloids entering the interior of the flow stabilizer cup 51 can flow spontaneously into the interior of the conditioning chamber 311 by gravity to participate in sludge conditioning. It should be noted that an overflow port 53 is provided on one side of the flow stabilizer cup 51, and a vertical counterweight groove is provided on one side of the flow stabilizer cup 51. The counterweight groove and the overflow port 53 are intersected and connected. A counterweight plate 54 is vertically inserted into the counterweight groove. Under normal conditions, the counterweight plate 54 falls under its own weight, and the overflow port 53 remains connected to the inside of the recovery hopper 412. Only when the cam 56 presses the driven rod 55 does the counterweight plate 54 move downward to close the overflow port 53. A driven rod 55 is fixedly connected to one side of the counterweight plate 54. A lifting port for the driven rod 55 to pass through is provided inside the recovery hopper 412. A waterproof sleeve is fixedly connected inside the lifting port and is fixedly connected to the driven rod 55. A cam 56 is fixedly connected to the end of the main shaft 21 near the recovery hopper 412. The cam 56 is driven to rotate synchronously by the main shaft 21, causing the convex end of the cam 56 to rotate accordingly. When the convex end of the cam 56 rotates to the lower dead center, it presses down on the driven rod 55, causing the counterweight plate 54 to move downward, so that the overflow port 53 is closed to the inside of the recovery hopper 412. When the convex end of the cam 56 rotates away from the lower dead center, the driven rod 55 and the counterweight plate 54 automatically return to their original position by their own weight, so that the overflow port 53 is connected to the inside of the recovery hopper 412. The condensate containing layered silicate clay mineral colloid stored in the recovery hopper 412 flows into the inside of the flow stabilizing cup 51 through the overflow port 53. The on and off frequency of the overflow port 53 is controlled by the rotation speed of the main shaft 21 to achieve rigid synchronous matching between the amount of condensate added and the amount of drying treatment.

[0060] This equipment is also equipped with a reverse locking control structure for drying conditions, which enables the drying process to adaptively and rigidly match the feed amount and conditioning intensity of the upstream conditioning process. This solves the problem of abnormal generation of silica colloid caused by the disconnect between upstream and downstream processes and fluctuations in operating conditions from a mechanical perspective. The reverse locking control structure uses the main shaft 21 of the coaxial linkage assembly 2 as the only mechanical linkage reference. The rotation speed of the main shaft 21 is adaptively controlled by the drying conditions in the gradient drying reaction control component 32, and the rotation speed signal is directly transmitted in reverse to the conditioning and pre-dehydration component 31, forming a rigid linkage of the entire process of drying and conditioning. Among them, the two toothless, wide-bladed, large-lead smooth spiral modified impellers of the stirring blade 313 near the feed hopper 312 have their single-turn conveying capacity locked by reverse calculation based on the rated maximum heat load and processing capacity of the drying chamber. When the moisture content of the material in the drying chamber is high and the drying load increases, the speed of the main shaft 21 decreases adaptively, and the feed conveying capacity of the modified impeller decreases synchronously, thus locking the feed capacity of the conditioning chamber 311 to not exceed the processing capacity of the drying chamber. When the main shaft 21 reaches the rated maximum speed, the maximum feed capacity of the modified impeller is completely matched with the rated maximum processing capacity of the drying chamber, thus completely eliminating the problems of insufficient sludge drying and excessive dissolution of silicate minerals caused by excessive upstream feed. Meanwhile, the short rods 314 on the stirring blades 313 and the toothed small-lead high-shear blades form a graded reverse locking structure for conditioning intensity. The distribution density of the short rods 314 and the tooth spacing of the toothed blades are linked and matched with the rotational speed of the main shaft 21. When the working conditions in the drying chamber fluctuate and the rotational speed of the main shaft 21 decreases, the shearing frequency of the short rods 314 and the toothed blades decreases synchronously, and the conditioning shearing intensity is adaptively weakened, avoiding the abnormal generation of nano-scale hydrophobic silica colloids caused by excessive conditioning leading to overly fine sludge particles. When the working conditions in the drying chamber are stable and the main shaft 21 maintains its rated speed, the short rods 314 and the toothed blades work together to form high-intensity shear conditioning, ensuring the sludge dewatering performance and achieving precise reverse control of conditioning intensity by the drying conditions. The aforementioned reverse interlocking control structure for drying conditions relies entirely on mechanical linkage, requiring no additional electrical control components. This aligns with the compact and mobile design goals of the entire machine. Through adaptive rigid matching of the drying and conditioning processes, it eliminates the inherent defects of the existing linear series mode, effectively preventing abnormal colloid generation and accumulation caused by fluctuations in operating conditions. This significantly improves the long-term stability of the equipment and the long-term effectiveness of water recycling.

[0061] The complete operating procedure of this equipment is as follows: S1. The high silicate yellow mud sludge to be treated enters the conditioning chamber 311 through the feed hopper 312. The main shaft 21 drives the stirring blade 313 to rotate, which shears, stirs and conditions the sludge. At the same time, the active colloidal condensate water returned by the reverse conditioning component 5 enters the conditioning chamber 311 and is fully mixed with the sludge to improve the sludge dewatering performance. S2. The conditioned sludge enters the dewatering chamber 319 through the feed port 318. The main shaft 21 drives the screw extrusion blade 3110 to rotate, and the sludge is pre-dewatered by screw extrusion. The dewatered water is directly discharged through the filter plate 3111, the recycling tank, and the drain pipe 3112. S3. The pre-dehydrated sludge enters the pre-drying chamber 321, the constant temperature control chamber 322, and the balanced discharge chamber 323 in sequence through the arc-shaped opening of the partition plate 324. The main shaft 21 drives the corresponding propeller blades to rotate synchronously, performing gradient drying and cooling of the sludge. The dried finished sludge is discharged through the discharge port 328. S4. The hot air heated by the partitioned closed-loop heat pump heat exchanger unit 41 is sent to each drying chamber through the air inlet pipe 42. The wet and hot exhaust gas after fully exchanging heat with the sludge is collected through the air outlet branch pipe 43 to the air outlet main pipe 44 and sent into the stepped plate frame 45 for graded condensation. S5. The hot and humid exhaust gas passes through the first-stage high-temperature condensing chamber 46, the second-stage medium-temperature condensing chamber 47, and the third-stage low-temperature condensing chamber 48 in sequence. The inert harmful colloidal waste liquid condensed in the first-stage high-temperature condensing chamber 46 and the small molecule harmful colloidal waste liquid condensed in the third-stage low-temperature condensing chamber 48 are directly discharged. The condensate containing active gelling agents condensed in the second-stage medium-temperature condensing chamber 47 enters the recovery hopper 412 for storage. S6. When the main shaft 21 rotates, it drives the cam 56 to rotate synchronously. The frequency of opening and closing of the overflow port 53 is controlled by the driven rod 55 and the counterweight plate 54, so that the active condensate in the recovery hopper 412 enters the flow stabilizing cup 51 at a flow rate matching the drying amount, and then flows back to the conditioning chamber 311 through the gravity drainage pipe 52 to form a self-circulating conditioning system. S7. The exhaust gas after staged condensation and dehumidification is returned to the zoned closed-loop heat pump heat exchanger unit 41, reheated and then sent to the drying chamber for recycling.

[0062] It should be noted that a guide rod 57 is fixedly connected inside the lifting port, and a guide opening is provided through the driven rod 55 for the guide rod 57 to pass through. The movement of the counterweight plate 54 is guided by the sliding of the driven rod 55 on the guide rod 57.

[0063] It should be further explained that, in addition to solving the core technical problems of the prior art, the sludge drying equipment with reverse conditioning and locking control of the present invention also brings a number of unexpected technical effects through structural innovation, as follows: Firstly, this equipment achieves a chemical-free self-conditioning and sludge-breaking function. The active colloids of native yellow clay recovered in the secondary medium-temperature condensation chamber 47 are directionally recycled to the high-shear mixing zone in the conditioning chamber 311 via the reverse conditioning component 5. After sufficient contact with the sludge, they can directly replace the chemical agents such as PAM flocculants and sludge de-adhesion agents that must be added in existing technologies, thus completing the sludge conditioning and de-adhesion process. This design breaks away from the conventional technical approach of relying on chemical agents in this field. It not only avoids the risk of secondary pollution caused by chemical agents, but also saves the long-term costs of agent procurement, storage, and addition. At the same time, the native colloids have stronger compatibility with the sludge, and the dewatering performance of the conditioned sludge is more stable, effectively avoiding the dewatering failure problem caused by the incompatibility between chemical agents and sludge composition.

[0064] Secondly, this equipment achieves full-condition adaptive control based on a purely mechanical structure. Through the coaxial linkage design of a single main shaft 21, it simultaneously realizes three core functions: reverse control of feed rate, adaptive matching of conditioning intensity, and synchronization of condensate addition and drying amount. The large-lead smooth spiral blade of the stirring blade 313 controls the feed rate through the rotation speed of the main shaft 21; the short rod 314 cooperates with the toothed blade to adjust the conditioning intensity through the rotation speed of the main shaft 21; and the cam 56 of the reverse conditioning component 5 cooperates with the driven rod 55 to control the condensate addition through the rotation speed of the main shaft 21. The entire process requires no PLC, moisture content sensor, frequency converter motor, flow regulating valve, or any other electrical control components. This structure is perfectly adapted to the harsh working conditions of construction sites, such as high dust, high humidity, unstable voltage, and lack of professional maintenance personnel. It completely avoids the industry pain points of easy failure and damage of electrical control systems, greatly improving the reliability and environmental adaptability of the equipment. Moreover, it does not require professional maintenance personnel, lowering the maintenance threshold at construction sites.

[0065] Thirdly, this equipment achieves a completely closed-loop circulation of drying exhaust gas with zero fugitive emissions. The zoned closed-loop heat pump heat exchanger unit 41 and the stepped condensing chamber form a completely closed hot air circulation system. The humid and hot exhaust gas generated during drying is collected via the outlet branch pipe 43 and sent to the outlet main pipe 44. After staged condensation and dehumidification in the first-stage high-temperature condensing chamber 46, the second-stage medium-temperature condensing chamber 47, and the third-stage low-temperature condensing chamber 48, all of it is returned to the zoned closed-loop heat pump heat exchanger unit 41 for reheating, and then sent back to each drying chamber for recycling through the inlet pipe 42. There is no exhaust gas emission throughout the entire process. This design eliminates the need for additional exhaust gas scrubbing and dust removal equipment, effectively avoiding environmental pollution caused by dust, odors, and alkaline aerosols carried by the drying exhaust gas. It fully complies with the stringent environmental control requirements of the construction site, avoiding the risks of environmental complaints and penalties. Furthermore, the closed-loop design reduces heat loss, further improving the energy-saving effect of the equipment.

[0066] Fourth, this equipment addresses the root cause of high-viscosity yellow mud's wall adhesion, crusting, and material blockage by addressing its drying characteristics. The gradient drying reaction control component 32 employs a step-by-step cooling drying mode. Hot air at 100-120℃ in the pre-drying chamber 321 rapidly removes surface water and reduces stickiness from the high-moisture sludge. Hot air at 80-90℃ in the constant-temperature control chamber 322 achieves deep and uniform drying. Cooling is completed by ambient-temperature air in the balanced discharge chamber 323. Simultaneously, the pre-drying chamber 321 is equipped with smooth, equal-pitch spiral pusher blades 325 with notches, providing gentle material turning to prevent the high-moisture sludge from being thrown against the walls and crusting. The constant-temperature control chamber 322 is equipped with equal-pitch, double-headed, continuous spiral reaction blades 326 to enhance material turning and contact with hot air. Each drying chamber is also equipped with anti-blocking right-angle plates 329 to prevent sludge from entering the air vents. This design, through the synergistic adaptation of the drying temperature gradient and the dedicated blade structure, avoids the problems of wall adhesion, crusting, and material blockage from the root cause of sludge drying characteristics. It eliminates the need for additional wall scraping and cleaning structures, enabling long-term continuous operation of the equipment, significantly reducing the frequency of downtime for cleaning, and improving the sludge treatment efficiency of the construction site.

[0067] The above-mentioned technical effects are all achieved through the core structural innovation of this invention, which has significant creativity compared with the existing technology. It further expands the practical value and application scenarios of the equipment, ensuring that the equipment can not only solve the core water recycling problem in green construction of building projects, but also adapt to the complex working conditions and diverse needs of the construction site.

[0068] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sludge drying device with reverse conditioning and locking control, comprising a housing (1), wherein the housing (1) is provided with a coaxial linkage assembly (2), a conditioning and drying unit (3), and a heat exchange and condensation assembly (4); the coaxial linkage assembly (2) includes a horizontally rotating main shaft (21) and a motor (22) driven and connected to the main shaft (21); the conditioning and drying unit (3) includes a conditioning and pre-dehydration assembly (31) and a gradient drying reaction control assembly (32) arranged sequentially along the axial direction of the main shaft (21), wherein the working parts of the conditioning and pre-dehydration assembly (31) and the gradient drying reaction control assembly (32) are coaxially and securely connected to the main shaft (21); the air inlet of the heat exchange and condensation assembly (4) is connected to the air outlet of the gradient drying reaction control assembly (32), characterized in that, The heat exchange condensation assembly (4) includes an integrally enclosed stepped plate frame (45). The stepped plate frame (45) is provided with a stepped series arrangement of a first-stage high-temperature condensation chamber (46), a second-stage medium-temperature condensation chamber (47), and a third-stage low-temperature condensation chamber (48). The height of the three condensation chambers decreases step by step, and each condensation chamber has an independent drainage structure at its bottom. The drainage structure of the second-stage medium-temperature condensation chamber (47) is connected to a reverse conditioning assembly (5). The outlet end of the reverse conditioning assembly (5) extends into the conditioning and pre-dehydration assembly (31). The reverse conditioning assembly (5) is driven and cooperates with the main shaft (21) to synchronize the amount of condensate added with the drying conditions.

2. The sludge drying equipment with reverse conditioning interlock control according to claim 1, characterized in that: The gradient drying reaction control component (32) includes a pre-drying chamber (321), a constant temperature control chamber (322), and a balanced discharge chamber (323) arranged sequentially along the main shaft (21). Adjacent chambers are separated by partition plates (324). A dynamic sealing structure is provided between the partition plates (324) and the main shaft (21). An arc-shaped opening for material to pass through is provided at the bottom of the partition plates (324).

3. The sludge drying equipment with reverse conditioning interlock control according to claim 2, characterized in that: The pre-drying chamber (321), the constant temperature control chamber (322), and the balanced discharge chamber (323) are respectively coaxially and tightly connected with a spiral pusher blade (325), a spiral reaction blade (326), and a spiral discharge blade (327); the air inlet pipe (42) of the pre-drying chamber (321) and the constant temperature control chamber (322) is located at the material inlet end of the chamber body, and the air outlet branch pipe (43) is located at the material outlet end of the chamber body; the air inlet pipe (42) of the balanced discharge chamber (323) is located at the material outlet end of the chamber body, and the air outlet branch pipe (43) is located at the material inlet end of the chamber body.

4. A sludge drying device with reverse conditioning interlock control according to claim 3, characterized in that: The pre-drying chamber (321), the constant temperature control chamber (322), and the balanced discharge chamber (323) are all fixed with anti-blocking right-angle plates (329). The anti-blocking right-angle plates (329) are located directly below the openings of the air inlet pipe (42) and the air outlet branch pipe (43). The vertical plate is perpendicular to the material travel direction, and the horizontal plate surface is parallel to the corresponding pipe opening with a gap for air passage.

5. A sludge drying device with reverse conditioning interlock control according to claim 1, characterized in that: The heat exchange condensation assembly (4) also includes a refrigerant plate frame (413) corresponding to the three condensation chambers. The refrigerant plate frame (413) and the stepped plate frame (45) together form a refrigerant channel (414). The refrigerant inlet pipe (415) of the refrigerant channel (414) is located on the side corresponding to the third-stage low-temperature condensation chamber (48), and the refrigerant outlet pipe (416) is located on the side corresponding to the first-stage high-temperature condensation chamber (46), forming a counter-current heat exchange structure.

6. A sludge drying device with reverse conditioning interlock control according to claim 1, characterized in that: Each of the primary high-temperature condensing chamber (46), the secondary medium-temperature condensing chamber (47), and the tertiary low-temperature condensing chamber (48) is equipped with a baffle plate (49). The baffle plates (49) are arranged alternately to form an S-shaped airflow path within the condensing chamber.

7. A sludge drying device with reverse conditioning interlock control according to claim 1, characterized in that: The reverse conditioning component (5) includes a recovery hopper (412), a flow stabilizer (51), and a gravity drain pipe (52). The recovery hopper (412) is sealed and connected to the recovery port (411) of the secondary medium-temperature condensing chamber (47). The flow stabilizer (51) is inverted inside the recovery hopper (412). The inlet end of the gravity drain pipe (52) extends into the inside of the flow stabilizer (51), and the outlet end extends into the conditioning chamber (311) of the conditioning and pre-dehydration component (31).

8. A sludge drying device with reverse conditioning interlock control according to claim 7, characterized in that: The flow stabilizing cup (51) has an overflow port (53), and a vertically movable counterweight plate (54) is inserted into the overflow port (53). The counterweight plate (54) is connected to a driven rod (55). A cam (56) is coaxially fastened to the main shaft (21). The cam (56) abuts against the driven rod (55) and is used to control the opening and closing of the overflow port (53) by rotating the main shaft (21).

9. A sludge drying device with reverse conditioning interlock control according to claim 1, characterized in that: The conditioning and pre-dehydration assembly (31) includes a conditioning chamber (311) and a dehydration chamber (319) that are connected to each other. A stirring blade (313) is coaxially and fastened in the conditioning chamber (311), and a spiral extrusion blade (3110) is coaxially and fastened in the dehydration chamber (319). A filter plate (3111) with filter holes is provided at the bottom of the dehydration chamber (319).

10. A sludge drying device with reverse conditioning interlock control according to claim 9, characterized in that: The stirring blade (313) is provided with a large-lead smooth spiral blade at one end near the feed hopper (312) of the conditioning chamber (311). The single-turn conveying capacity of the large-lead smooth spiral blade is inversely matched with the rated processing capacity of the drying chamber.

Images