A new energy-saving device for physical and chemical recycling of tannery waste liquid

Abstract

The present application relates to sewage treatment technical field, especially to a new energy-saving tannery waste liquid physical and chemical recycling device. Including the processing jar, the processing jar is coaxial rotation installation with the main shaft and the installation cylinder, the main shaft and the installation cylinder differential rotation, the main shaft lower end is equipped with the crankshaft, the crankshaft is connected with the negative pressure piston assembly, the installation cylinder side wall is equipped with the negative pressure room, the negative pressure piston assembly sets up in the negative pressure room, the negative pressure room tail end is butt jointed with the connecting pipe, the connecting pipe side wall is butt jointed with the one-way feed pipe, the lower end is butt jointed with the one-way discharge pipe, the discharge pipe tail end is butt jointed with the hollow spiral pipe, the spiral pipe is equipped with the injection port. Through the installation cylinder rotation drive spiral pipe realizes cyclone stirring, through the main shaft differential rotation drive piston reciprocating motion realizes waste liquid upper layer suction, lower layer injection, the upper and lower layer intermingling circulation, two kinds of movement mode superposition, constructs shear type cyclone stirring + upper and lower layer intermingling dynamic mixing system, effectively solves the problem of traditional equipment local stirring, waste liquid stratification, uneven mixing.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a novel energy-saving physicochemical recycling device for leather tanning wastewater. Background Technology

[0002] The leather industry is an important part of my country's light industry, encompassing multiple processing steps such as raw hide pretreatment, tanning, dyeing, and finishing. The production process generates a large amount of complex industrial wastewater. This wastewater contains high levels of proteins, oils, tanning agents, dyes, heavy metal ions, and suspended particulate matter, characterized by high pollutant concentrations, high viscosity, complex composition, and poor biodegradability. Direct discharge would severely pollute water bodies and soil ecosystems; therefore, it must be treated harmlessly and recyclably through processes such as physicochemical reactions, chemical neutralization, flocculation and sedimentation, and circulating purification.

[0003] In the physicochemical treatment process of tanning wastewater, the thorough mixing and reaction of the wastewater with flocculants, neutralizers, coagulants, and other treatment agents is the core link that determines the treatment effect and improves the recycling rate of the wastewater. At present, traditional tanning wastewater treatment devices mostly adopt a single fixed agitator or a single-layer rotary agitator structure, with a single agitation mode, which can only achieve local horizontal stirring of the wastewater, and has obvious technical defects.

[0004] First, traditional shear-type agitators can only mix the surface or localized areas of the waste liquid in the tank, failing to achieve cross-mixing between the upper and lower layers. This easily leads to stratification, where the lower layer has excessively high reagent concentration while the upper layer has not fully reacted, resulting in poor uniformity of reagent-waste liquid mixing, incomplete physicochemical reactions, and reduced waste liquid treatment quality and recycling efficiency. Second, traditional agitation and pumping structures are independent, requiring separate agitator motors and pumping equipment. This results in low equipment integration, high energy consumption, and does not meet the production requirements for energy-saving treatment. Furthermore, the split structure occupies a large amount of internal tank space, leading to a high failure rate and high maintenance costs. Finally, the shearing effect of a single agitator is limited. Given the high viscosity and suspended flocculent content of tanning waste liquid, it cannot effectively disperse agglomerated particles, easily leading to floc accumulation and reaction dead zones, further restricting the physicochemical treatment effect of the waste liquid.

[0005] In summary, existing tanning wastewater treatment devices suffer from technical problems such as a single stirring mode, lack of upper and lower layer wastewater mixing structure, poor mixing uniformity, low equipment integration, high energy consumption, and insufficient reaction, which cannot meet the needs of efficient, energy-saving, and recyclable physicochemical treatment of tanning wastewater.

[0006] Based on this, the present invention proposes a novel energy-saving tanning waste liquid physical and chemical recycling device, which constructs a dynamic mixing mode of shear stirring and upper and lower layer fusion by cooperating with the differential rotating main shaft and the mounting cylinder, thereby solving the above-mentioned defects of the prior art. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the prior art by proposing a new type of energy-saving tanning waste liquid physical and chemical recycling device.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A novel energy-saving tanning waste liquid physicochemical recycling device includes a treatment tank. A main shaft and an installation cylinder are coaxially rotatably mounted inside the treatment tank. The main shaft passes through the installation cylinder and rotates at a different speed than the installation cylinder. A crankshaft is provided at the lower end of the main shaft, and a negative pressure piston assembly is connected to the crankshaft. A negative pressure chamber corresponding to the negative pressure piston assembly is arranged around the side wall of the installation cylinder. The negative pressure piston assembly is located in the negative pressure chamber. Each negative pressure chamber is connected to a connecting pipe at its end. A one-way feed pipe is connected to the side wall of the connecting pipe, and a one-way discharge pipe is connected to the lower end. A hollow spiral tube is connected to the end of the discharge pipe, and a spray nozzle is provided on the spiral tube.

[0009] Preferably, the nozzles on the multiple sets of spiral tubes are located at different positions and are distributed at intervals along the axial direction of the treatment tank.

[0010] Preferably, the spray nozzle is oriented toward the axis of the treatment tank.

[0011] Preferably, the mounting cylinder extends upward to form an aeration cylinder, the main shaft passes through the aeration cylinder, an aeration piston assembly is embedded inside the aeration cylinder, the aeration piston assembly is provided with a one-way air inlet, and the aeration piston assembly moves up and down reciprocally with the rotation of the main shaft; the outer edge of the aeration cylinder is provided with a one-way air supply pipe corresponding to the negative pressure chamber, and the air supply pipe is connected to the corresponding negative pressure chamber.

[0012] Preferably, the upper end face of the aeration piston assembly is provided with a sliding groove, the sliding groove having crests and troughs, a slider is slidably installed in the sliding groove, a connecting rod is rotatably installed on the upper end of the slider, and the upper end of the connecting rod is rotatably installed on the side wall of the main shaft.

[0013] Preferably, the groove is figure-eight shaped.

[0014] Preferably, both the connecting rod and the slider are provided in two sets.

[0015] Preferably, the main shaft and the side wall of the mounting cylinder are respectively provided with a first driven gear and a second driven gear, and a drive shaft is rotatably installed inside the processing tank. The drive shaft is driven by a motor located outside the processing tank. The drive shaft is respectively provided with a first driving gear that meshes with the first driven gear and a second driving gear that meshes with the second driven gear. The transmission ratios between the first driving gear and the first driven gear, and between the second driving gear and the second driving gear are different.

[0016] Preferably, the air supply pipe is in contact with the lower outer edge of the aeration cylinder.

[0017] Preferably, the processing tank is equipped with a pressure regulating valve at its upper end.

[0018] Compared with the prior art, the present invention provides a novel energy-saving physicochemical recycling device for leather tanning wastewater, which has the following beneficial effects: 1. This invention achieves swirling agitation by rotating the mounting cylinder to drive the spiral tube, and achieves upper-layer fusion and circulation of waste liquid by differential rotation of the main shaft to drive the piston reciprocating. The superposition of these two dynamic motion modes constructs a shear-type swirling agitation + upper-layer fusion dynamic mixing system, which effectively solves the problems of localized agitation, waste liquid stratification, and uneven mixing in traditional equipment. It does not require the cooperation of multiple sets of equipment, has a highly integrated structure, is energy-saving and efficient, and improves the mixing reaction efficiency of leather tanning waste liquid and agents.

[0019] 2. This invention forms a multi-layered three-dimensional material mixing system inside the treatment tank through axially spaced and axially oriented multi-layered spray nozzles. Waste liquid and reagents can be mixed and reacted simultaneously in multiple areas of the upper, middle and lower parts of the tank, expanding the material mixing range, further improving the sufficiency of the physicochemical reaction of leather tanning waste liquid, and improving the purification and recycling effect of waste liquid.

[0020] 3. This invention achieves the mixing and pressurization of high-pressure gas and sprayed waste liquid through the linkage of the aeration piston assembly, the air supply pipe and the negative pressure chamber. On the one hand, it uses bubbles to stir and disperse the suspended flocs and bottom-layer floating materials in the tanning waste liquid; on the other hand, it increases the pressure and improves the spray stroke of the waste liquid, thus optimizing the three-dimensional mixing effect.

[0021] 4. This invention adopts an 8-shaped sliding groove combined with a linkage structure of double-group sliders and connecting rods, which can stably drive the aeration piston assembly to reciprocate and rise and fall regularly. The movement rhythm is uniform and the transmission stability is strong, ensuring the continuous and stable operation of aeration and pressurization, and improving the operational stability and service life of the equipment.

[0022] 5. This invention precisely controls the differential speed between the main shaft and the mounting cylinder through gear pairs with different transmission ratios. It can flexibly adjust the stirring speed, suction and spray frequency, and aeration intensity according to the concentration and viscosity of the tanning waste liquid. The equipment has strong adaptability and can meet the physicochemical treatment needs of tanning waste liquid under different working conditions.

[0023] 6. This invention highly integrates the stirring, waste liquid suction, and material spraying structures onto the main shaft and mounting cylinder assembly. Only a single drive motor is needed to achieve multi-function linkage, eliminating the need for independent stirring and pumping equipment. This improves equipment integration, simplifies equipment structure, reduces equipment manufacturing costs and post-maintenance difficulty, and effectively reduces equipment operating energy consumption, resulting in excellent energy-saving effects.

[0024] Other advantages, objectives and features of the invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be learned from practice of the invention. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the entire invention.

[0026] Figure 2 This is a cross-sectional schematic diagram of the entire invention.

[0027] Figure 3 This is a three-dimensional schematic diagram of the dynamic stirring structure inside the processing tank of the present invention.

[0028] Figure 4 For the present invention Figure 3 A top-down view.

[0029] Figure 5 For the present invention Figure 4 A plan view after removing the support and spiral tube.

[0030] Figure 6 For the present invention Figure 3 A 3D view after removing the bracket and connector.

[0031] Figure 7 For the present invention Figure 6 A 3D diagram after removing the spiral tube.

[0032] Figure 8 This is a three-dimensional schematic diagram of the aeration cylinder, aeration piston assembly and its driving structure of the present invention.

[0033] Figure 9 This is a three-dimensional schematic diagram of the crankshaft and negative pressure piston assembly of the present invention.

[0034] Figure 10 This is a cross-sectional schematic diagram of the dynamic stirring structure for removing the spiral tube according to the present invention.

[0035] Figure 11 For the present invention Figure 10 Cross-sectional view of the connection between the main spindle, crankshaft, and negative pressure piston assembly.

[0036] Figure 12 For the present invention Figure 11 A partial schematic diagram of point A in the middle.

[0037] Figure 13 This is a three-dimensional schematic diagram of the first lifting structure of the can lid of the present invention.

[0038] Figure 14 This is a three-dimensional schematic diagram of the second lifting structure of the can lid of the present invention.

[0039] In the diagram: 1. Processing tank; 2. Main shaft; 3. Mounting cylinder; 4. Drive shaft; 5. First driving gear; 6. Second driving gear; 7. First driven gear; 8. Second driven gear; 9. Support; 10. Negative pressure chamber; 11. Negative pressure piston assembly; 12. Feed pipe; 13. Discharge pipe; 14. Spiral tube; 15. Spray nozzle; 16. Aeration cylinder; 17. Aeration piston assembly; 18. Air delivery pipe; 19. Slide groove; 20. Sliding block; 21. Connecting rod; 22. Eccentric shaft; 23. Eccentric plate; 24. Sleeve; 25. Collar; 26. Bearing outer ring; 27. Bearing inner ring; 28. Support component; 29. ​​Support ring; 30. Extension shaft; 31. Piston handle. Detailed Implementation

[0040] The following will refer to the appendices in the embodiments of the present invention. Figure 1-14 The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] Example 1: To address the technical problems of existing leather tanning wastewater treatment devices, such as a single stirring mode, lack of upper and lower layer wastewater fusion structure, poor mixing uniformity, and low equipment integration, this example designs a physicochemical recycling device for leather tanning wastewater that integrates shear-type stirring and upper and lower layer fusion dynamic mixing mode.

[0042] See attached document Figure 1 As shown, the main body of the tannery waste liquid physicochemical recycling device is the treatment tank 1. Treatment tank 1 adopts a split structure, with the tank body and tank cover assembled and sealed by a circumferential array of bolts, facilitating easy disassembly and assembly and internal maintenance. The bottom side wall of the tank body has a tapered design to facilitate material collection and external discharge; and a discharge port with an electrically controlled valve is provided for discharging the waste liquid after treatment. Three sets of valved inlets are arrayed on the top of the tank cover, corresponding to the feeding of waste liquid, flocculant, and neutralizing agent respectively, enabling independent feeding of different materials.

[0043] See attached document Figure 2 , 7 As shown in Figures 9 and 10, the main shaft 2 and the mounting cylinder 3 are coaxially assembled inside the processing tank 1. The main shaft 2 passes through the central cavity of the mounting cylinder 3. The two are clearance-fitted and can rotate independently at different speeds.

[0044] A triangular bracket 9 is welded and fixed to the lower middle part of the interior of the treatment tank 1. The three legs of the triangular bracket 9 are welded and fixed to the inner wall of the tank, providing strong stability. The lower end of the mounting cylinder 3 is rotatably assembled at the center of the triangular bracket 9 via a bearing, providing a stable base for the mounting cylinder 3 to rotate. The bottom center of the tank cover is fixed to the connecting seat via bolts, and the upper end of the mounting cylinder 3 is rotatably connected to the connecting seat via a sealed bearing, realizing bidirectional limiting at both ends and ensuring that the mounting cylinder 3 does not shake or deviate when rotating at high speed.

[0045] The upper and lower ends of the spindle 2 are rotatably mounted on the upper and lower end faces of the mounting cylinder 3 via bearing seats, thereby achieving the rotatable mounting of the spindle 2.

[0046] Multiple crankshafts are installed at the lower end of the main shaft 2. The ends of the crankshafts are hinged to the negative pressure piston assembly 11 via pins, ensuring that the piston can swing and reciprocate flexibly. Four sets of negative pressure chambers 10 are integrally formed around the side wall of the mounting cylinder 3, corresponding one-to-one with the four sets of negative pressure piston assemblies 11. A sealing rubber ring is fitted on the outside of the negative pressure piston assembly 11, which slides and seals with the inner wall of the negative pressure chamber 10 to ensure the sealing of negative pressure suction and high pressure extrusion. Each negative pressure chamber 10 has a negative pressure hole at its end, which is connected to a connecting pipe. A one-way feed pipe 12 is inserted and fixed to the side wall of the connecting pipe, allowing only waste liquid and drug mixture in the tank to flow in; a one-way discharge pipe 13 is inserted and fixed to the lower end of the connecting pipe, allowing only the sucked-in material to be discharged outward. A hollow spiral pipe 14 is fixed to the lower end of the discharge pipe 13 by flange bolts. The spiral pipe 14 is an arc-shaped hollow tubular structure with a spray nozzle 15 on its wall.

[0047] Based on the above technical solution: When the equipment is running, the drive structure drives the mounting cylinder 3 to rotate at a constant speed. The mounting cylinder 3 synchronously drives the multiple sets of spiral tubes 14 surrounding the outside to rotate in a circular motion. The spiral tubes 14 replace the traditional stirring paddle to stir the waste liquid in the treatment tank 1 and form a swirling stirring effect.

[0048] Simultaneously, the main shaft 2 and the mounting cylinder 3 rotate at different speeds, with a difference between their rotational speeds. During the rotation of the main shaft 2, multiple crankshafts rotate synchronously. When the crankshafts rotate, they drive the negative pressure piston assembly 11 to slide back and forth regularly within the negative pressure chamber 10. When the negative pressure piston assembly 11 slides outward, a negative pressure is formed inside the negative pressure chamber 10, and the waste liquid and reagent mixture in the upper layer of the treatment tank 1 are drawn in through the one-way feed pipe 12. When the negative pressure piston assembly 11 slides inward, the pressure inside the negative pressure chamber 10 increases, and the drawn-in material is forced into the hollow spiral tube 14 through the one-way discharge pipe 13, and finally sprayed from the nozzle 15 of the spiral tube 14 to the lower area of ​​the treatment tank 1.

[0049] The installation cylinder 3 rotates to drive the spiral tube 14 to achieve swirling agitation. The differential rotation of the main shaft 2 drives the piston to reciprocate, achieving the upper layer suction and lower layer spraying of waste liquid in a mixed circulation. The superposition of these two dynamic motion modes constructs a shear-type swirling agitation + upper and lower layer mixed dynamic mixing system, which effectively solves the problems of local agitation, waste liquid stratification, and uneven mixing in traditional equipment. It does not require the cooperation of multiple sets of equipment, has a highly integrated structure, is energy-saving and efficient, and improves the mixing reaction efficiency of leather tanning waste liquid and agents.

[0050] In this design, a single crankshaft can be used to synchronously drive four sets of negative pressure piston assemblies 11: see attached diagram. Figure 11As shown, the crankshaft includes two sets of eccentric plates 23, upper and lower. The upper eccentric plate 23 is fixedly connected to the main shaft 2 by bolts, and the lower eccentric plate 23 has an integral extension shaft 30 on its bottom side, which is rotatably mounted on the bottom wall of the mounting cylinder 3. An eccentric shaft 22 is provided between the two sets of eccentric plates 23, and the eccentric shaft 22 is offset from the axis of the main shaft 2. Four sets of collars 25 are vertically spaced on the eccentric shaft 22, and the four sets of collars 25 are rotatably engaged with the eccentric shaft 22 through bearings. A piston handle 31 is detachably mounted on the side wall of the collar 25 by bolts, and the piston handle 31 is rotatably engaged with the piston assembly through a pin. In this way, the main shaft 2 drives the eccentric shaft 22 to perform eccentric revolution, thereby driving the four sets of negative pressure piston assemblies 11 to run synchronously.

[0051] To accommodate the installation of four sets of bearing rings 25 on the eccentric shaft 22, the eccentric shaft 22 is typically designed as a stepped shaft: four steps, with the diameter gradually decreasing from top to bottom. This allows for the stepped assembly of the four sets of bearings using bearing inner rings 27 of different diameters. However, this design results in the smallest shaft diameter for the uppermost bearing. Since the corresponding shaft sections of the four bearing sets experience roughly the same stress, the section with the smallest diameter is most prone to deformation under this stress. Therefore, to ensure the synchronous stability of the four bearing installation shaft sections and maintain the smooth shaft design of the eccentric shaft 22, the design of the bearing rings 25 is modified, and a support 28 and a sleeve 24 are added between the two sets of bearings: see attached... Figure 11 , 12 As shown, the upper end of the collar 25 has a groove that matches the outer edge of the bearing outer ring 26 for mounting the bearing outer ring 26. The bottom wall of the groove has a recess with a diameter larger than the outer edge diameter of the bearing inner ring 27, so that after the bearing outer ring 26 is mounted and rests against the groove surface, the bearing inner ring 27 is suspended, thus preventing interference between the relative rotation of the inner and outer rings. A sleeve 24 is fitted onto the eccentric shaft 22, with its outer edge matching the inner circular surface of the bearing inner ring 27 for mounting the bearing inner ring 27. The lowest end of the sleeve 24 has an outer flange ring that rests against the lower end face of the lowest bearing inner ring 27, providing a support base for the lowest bearing inner ring 27. In this way, the mounting of the lowest bearing can be achieved through the groove on the collar 25, the recess on the groove, the sleeve 24, and the flange on the sleeve 24.

[0052] Before installing the upper bearing, a support ring 29 is first fitted onto the sleeve 24. The outer diameter of the support ring 29 is smaller than the inner diameter of the bearing outer ring 26. Then, a disc-shaped support member 28 is fitted, with its bottom end abutting against the upper end face of the lower bearing outer ring 26. A retaining ring is fitted into the inner circular surface of the groove of the collar 25, and the support member 28 is fastened by the retaining ring. The inner circular surface of the support member 28 is flush with the outer edge of the support ring 29, and a shaft seal is provided on the contact surface, thus achieving a seal on the upper end face of the bearing. After that, the corresponding collar 25 of the upper bearing is fitted. The lower side of the collar 25 has a slot, and the upper end face of the support member 28 is inserted into the slot, thereby supporting and restricting the upper collar 25. When the upper bearing is embedded in the groove of the upper collar 25, the lower end face of the upper bearing inner ring 27 abuts against the upper end face of the support ring 29. In this way, the upper collar 25 is integrated with the upper bearing outer ring 26 and acts on the lower bearing outer ring 26 through the support member 28; while the upper bearing inner ring 27 acts on the lower bearing inner ring 27 through the support ring 29, and the bearing inner ring 27 forms an independent assembly structure. Without changing the shaft diameter of the eccentric shaft 22, the four sets of bearings can be assembled, and the inner and outer rings of the bearings can rotate without interfering with each other.

[0053] In this embodiment, a drive structure is provided that enables differential drive between the spindle 2 and the mounting cylinder 3: Refer to the attached diagram. Figure 2 , 7 As shown in Figure 10, the differential drive structure includes a first driven gear 7 fixed to the upper side wall of the main shaft 2 via a key, and a second driven gear 8 fixed to the upper side wall of the mounting cylinder 3 via a key. A drive shaft 4 is rotatably mounted on the inner wall of the processing tank 1, with one end extending outside the tank body and connected to a drive motor via a coupling. A first driving gear 5 and a second driving gear 6 are fixed to the drive shaft 4 via keys. The first driving gear 5 meshes precisely with the first driven gear 7, and the second driving gear 6 meshes precisely with the second driven gear 8. The two sets of gear pairs are configured with different transmission ratios to achieve a fixed speed difference between the main shaft 2 and the mounting cylinder 3. The drive motor drives the drive shaft 4 to rotate at a constant speed. The drive shaft 4 drives the main shaft 2 and the mounting cylinder 3 to rotate via the two sets of gear pairs with different transmission ratios, ensuring that the speed of the main shaft 2 is always greater than the speed of the mounting cylinder 3, maintaining a differential motion state, and providing a stable power difference for the reciprocating motion of the piston.

[0054] In this embodiment, a rotating seat can be provided on the support 9, and ribs are provided on the rotating surface of the rotating seat. The ribs are connected to the spiral tube 14, which can enhance the shear stirring and improve the installation strength of the spiral tube 14.

[0055] In Example 2, the material mixing in the treatment tank 1 of Example 1 is only a single-layer reaction (fusion between the liquid surface and the bottom layer), with a limited mixing range and inconsistent reaction degree of the waste liquid in the middle layer. Therefore, in this example, the distribution structure of the nozzles 15 on the spiral tube 14 is optimized: the nozzles 15 on the four sets of spiral tubes 14 are distributed at intervals from top to bottom along the axial direction of the treatment tank 1, corresponding to the upper, upper-middle, lower-middle, and lower regions of the treatment tank 1, respectively; at this time, the inner cavity of the spiral tube 14 is not a whole cavity, and its bottom only reaches the nozzle 15. When the equipment is running, each set of negative pressure chambers 10 simultaneously completes the material suction and pressure spraying operation: simultaneously sucking in the upper layer of liquid, while the nozzles 15 of the spiral tubes 14 at different heights spray the mixed material into different longitudinal regions of the tank, and the upper layer material is simultaneously cross-displaced to the middle and lower layers. By using axially spaced multi-layered spray nozzles 15, a multi-layered three-dimensional material fusion system is constructed inside the treatment tank 1, breaking the longitudinal material stratification state of the tank and realizing material mixing reaction throughout the entire longitudinal height of the tank, further improving the overall mixing uniformity and physicochemical reaction effect.

[0056] In Example 3, all the nozzles 15 on the spiral tubes 14 are vertically oriented towards the axis of the processing tank 1. The suction pipe draws in the upper outer slurry and then sprays the slurry towards the middle and lower axis. On the basis of cross mixing between the upper and lower parts, it can also achieve horizontal mixing in the longitudinal direction, making the mixing state more diversified. At the same time, the slurry that tends to the tank wall due to centrifugal mixing can be transported towards the axis, promoting the mixing between the outer ring and the inside and improving the dynamic mixing effect.

[0057] In Example 4, the stirring speed of the stirring structure is limited and cannot be too fast. Therefore, the movement of the negative pressure piston assembly 11 within the negative pressure chamber 10 will not be as high as that of a car engine. This results in relatively low pressure of the liquid ejected from the nozzle 15 and insufficient material spraying stroke, which will affect the mixing effect of the inner and outer ring slurry. Therefore, in this embodiment, an aeration and pressurization linkage structure is added.

[0058] See attached document Figure 7 , 8As shown, an integrally formed aeration cylinder 16 extends upward from the upper end of the mounting cylinder 3. The diameter of the aeration cylinder 16 is smaller than that of the mounting cylinder 3. The main shaft 2 passes through the center of the aeration cylinder 16 and extends upward. An aeration piston assembly 17 is embedded inside the aeration cylinder 16. A sealing cup is fitted on the outer edge of the aeration piston assembly 17, which slides and seals against the inner wall of the aeration cylinder 16. The aeration piston assembly 17 is axially slidably installed inside the aeration cylinder 16. A one-way air inlet valve is opened on the piston plate, allowing only external air to enter the interior of the aeration cylinder 16. A vent hole is provided on the connecting seat. Four sets of one-way air supply pipes 18 are inserted and fixed to the lower outer edge of the aeration cylinder 16. The air supply pipes 18 correspond one-to-one with the four sets of negative pressure chambers 10. The air supply pipes 18 only allow gas from the aeration cylinder 16 to flow into the negative pressure chamber 10, and are cut off in the reverse direction. The air supply pipes 18, aeration cylinder 16, and negative pressure chambers 10 are all connected with sealing gaskets to ensure airtightness.

[0059] The air supply pipe 18 is uniformly connected to the lower outer edge of the aeration cylinder 16. The air supply pipe 18 is arranged at a downward angle to avoid the upper drive shaft 4 and gear transmission structure, so that there is no structural overlap or interference. The air supply pipe 18 is fixed to the side wall of the mounting cylinder 3 by pipe clamps.

[0060] The upper end face of the aeration piston assembly 17 is provided with a groove 19, and the inner side of the groove 19 is provided with a continuous peak and trough circulation structure; the slider 20 is slidably embedded inside the groove 19, and the slider 20 and the groove 19 are clearance-fitted to slide without jamming. The upper end of the slider 20 is hinged to the connecting rod 21 by a pin, and the upper end of the connecting rod 21 is rotatably mounted on the side wall of the main shaft 2 by a hinge seat.

[0061] Based on the above technical solution: When the main shaft 2 rotates at a differential speed with the mounting cylinder 3 and the aeration cylinder 16, the main shaft 2 will have a relative rotational displacement relative to the aeration cylinder 16. At this time, the main shaft 2 will drive the connecting rod 21 and the slider 20 to revolve synchronously around the main shaft 2. During the revolution of the slider 20, it slides alternately along the crests and troughs of the slide groove 19. When the slider 20 slides to the crest, the opening angle of the connecting rod 21 relative to the main shaft 2 increases, which will drive the aeration piston assembly 17 to rise. When the slider 20 slides to the trough, the opening angle of the connecting rod 21 relative to the main shaft 2 decreases, which will drive the aeration piston assembly 17 to sink downward, thereby realizing the regular up-and-down reciprocating motion of the aeration piston assembly 17.

[0062] When the aeration piston assembly 17 moves upward, a negative pressure is formed inside the aeration cylinder 16, and external air is drawn into the aeration cylinder 16 through the one-way air inlet; when the aeration piston assembly 17 moves downward, the air inlet closes, the air pressure inside the aeration cylinder 16 increases, and the high-pressure gas is forced into the corresponding negative pressure chamber 10 through each set of one-way air delivery pipes 18, where it mixes with the waste liquid mixture in the negative pressure chamber 10, and enters the spiral tube 14 along with the material and is sprayed out from the spray nozzle 15.

[0063] The addition of an aeration and pressurization linkage structure serves two purposes: first, pressurized gas is ejected along with the material to form bubbles, which agitate the floating material and sediment at the bottom of the tank, effectively breaking up agglomerated materials and preventing impurity accumulation; second, the gas is mixed with the waste liquid to achieve pressurized material injection, increasing the material injection stroke and allowing the injected material to diffuse more quickly towards the axis of treatment tank 1, further improving mixing uniformity and the sufficiency of physicochemical reactions. Furthermore, the cam-type linkage structure of the chute 19 and slider 20 converts the rotational motion of the main shaft 2 into the linear reciprocating motion of the aeration piston. This transmission structure is stable, consumes no additional power, and allows for precise control of the lifting and lowering rhythm of the aeration piston, ensuring continuous and uniform aeration and pressurization operations, thus improving the equipment's linkage and stability.

[0064] In this embodiment, the chute 19 adopts an 8-shaped closed-loop trajectory structure, with two sets of peaks and two sets of troughs symmetrically distributed. The slider 20 slides along the closed loop of the 8-shaped chute 19, and completes two full lifting cycles after each full rotation. Compared with ordinary chute 19, it has stronger motion stability, more uniform aeration and pressurization frequency, and ensures continuous stability of air pressure and material injection pressure inside the tank, avoiding pressure fluctuations from affecting the mixing effect.

[0065] Meanwhile, two sets of sliders 20 are symmetrically assembled on the left and right sides of the figure-eight shaped slide groove 19. Each set of sliders 20 has a connecting rod 21 hinged to its upper end. The two sets of connecting rods 21 are symmetrically hinged on both sides of the side wall of the main shaft 2, resulting in a symmetrical overall structure. The symmetrical transmission of the double sets of connecting rods 21 and sliders 20 improves the smoothness of the aeration piston assembly 17's operation, eliminates the eccentric torque of unilateral transmission, reduces equipment wear and jamming, extends equipment lifespan, and simultaneously improves transmission efficiency, ensuring continuous and stable aeration operation.

[0066] In this embodiment, a pressure regulating valve is installed on the upper end of the tank cover of treatment tank 1. The pressure regulating valve is fixed by a threaded seal and can adjust the air intake and exhaust volume inside the tank, realizing bidirectional pressure regulation inside the tank: the pressure regulating valve is adjusted according to the waste liquid treatment conditions. During the negative pressure suction stage, the air intake volume inside the tank is slightly increased to ensure sufficient suction; during the jet aeration stage, the exhaust volume is slightly adjusted to maintain the high pressure state inside the tank and ensure the jet and aeration effects. It can balance the pressure difference between negative pressure suction and high pressure jet, avoid equipment failure and reduced mixing effect caused by excessively high or low pressure inside the tank, and ensure stable operation of the equipment under all operating conditions.

[0067] In Example 5, the inner cavity of the triangular support 9 is a stirring blind zone. A bottom auxiliary stirring structure can be added: a cylinder 3 is installed at the downward extension of the lower eccentric plate 23's extension shaft 30, and an auxiliary stirring paddle is fixed in place by bolts. The auxiliary stirring paddle adopts a three-blade stirring structure, with the blades arranged perpendicularly to the main shaft 2. The entire paddle is located inside the cavity formed by the three legs of the triangular support 9, without contacting or interfering with the triangular support 9. Thus, during the differential rotation of the main shaft 2, the lower auxiliary stirring paddle is simultaneously driven to rotate at high speed, specifically stirring the waste liquid inside the triangular support 9 and at the bottom of the tank. This disperses suspended impurities and flocs deposited at the bottom, fills the bottom stirring blind zone, and further improves the overall physicochemical treatment quality of the leather tanning waste liquid.

[0068] Example 6: Traditionally, the tank lids of processing tank 1 are mostly disassembled and assembled manually, which is labor-intensive, has poor alignment accuracy, low sealing assembly efficiency, and is time-consuming to handle and disassemble, making it inconvenient for rapid internal inspection and maintenance. Therefore, this example adds an automated tank lid lifting structure, specifically two types: The first type is an automated can lid lifting structure driven by a screw and slide rail: see attached... Figure 13 As shown, a vertical frame is fixedly installed on the side of the tank. The frame is welded from channel steel, and the bottom of the frame is fixed to the equipment installation ground with expansion bolts to ensure overall support stability. A screw and slide rail assembly is vertically mounted inside the frame. The assembly includes a vertical linear slide rail, a ball screw, and a screw drive motor. The linear slide rail is bolted to the inner wall of the frame. The ball screw is vertically rotatably mounted between the upper and lower bearing seats of the frame. The screw drive motor is fixed to the top of the frame via a motor mount, and the motor output shaft is rigidly connected coaxially to the upper end of the ball screw. A lifting slide plate is bolted to the outer side of the screw slider 20 of the screw and slide rail assembly. The two lifting slide plates are respectively locked to the outer edges of the tank cover with flange bolts, achieving a rigid connection between the slide plate and the tank cover. The sealing surfaces of the tank cover and the tank body are fitted with annular sealing gaskets.

[0069] When it is necessary to close the can lid and seal the can body, the screw drive motor on the upright is started simultaneously. The motor drives the ball screw to rotate in the forward direction, driving the screw slider 20 to slide down at a constant speed along the vertical linear slide rail. The lifting slide plates on both sides simultaneously drive the can lid to descend vertically, accurately fitting the upper opening of the can body and completing the alignment and sealing assembly. When the equipment operation is completed and it is necessary to open the lid for maintenance or clean the internal structure of the can, the screw drive motor is controlled to rotate in the reverse direction. The ball screw drives the slider 20 and the lifting slide plate to slide upward, simultaneously pulling the can lid to rise vertically, completely separating it from the can body opening and exposing the internal cavity of the can body, which facilitates quick maintenance and cleaning by the staff.

[0070] The second type is a chain-driven guided can lid lifting structure: see attached... Figure 14As shown, a portal frame 9 is fixedly mounted on the outside of the tank. The frame 9 is integrally welded from square tubing, resulting in a strong structural load-bearing capacity and high stability. A drive shaft 2 is horizontally rotatably mounted at the top of the frame 9. One end of the drive shaft 2 is connected to a lifting drive motor. Two sets of identical chain drive assemblies are symmetrically mounted on the left and right sides of the frame 9. The sprockets of the two sets of chain drive assemblies are coaxially fixed to both ends of the drive shaft 2, achieving coaxial synchronous drive. Rectangular mounting plates are bolted to corresponding positions on the inner sides of the vertical chains of the two sets of chain drives. The center of the mounting plate is bolted to the upper surface of the tank cover. Circular guide posts are also vertically fixed on the left and right sides of the frame 9. The upper and lower ends of the guide posts are rigidly fixed to the frame 9. Fixed guide sleeves are embedded at both ends of the mounting plate, and the guide sleeves and corresponding guide posts slide vertically with a clearance fit, achieving precise vertical guidance and positioning of the mounting plate and the tank cover.

[0071] When the equipment needs to be sealed, the lifting drive motor is started. The motor drives the top of the bracket 9 to drive the main shaft 2 to rotate synchronously. The sprockets at both ends of the main shaft 2 drive the chains on both sides to rotate downward at a uniform speed. The chains pull the mounting plate to slide vertically downward along the guide column and guide sleeve, accurately driving the can lid to be pressed down smoothly and fit against the upper end of the can body, completing the sealing closure. When the can is to be opened, the motor is controlled to reverse, the chain rotates in the opposite direction, and the traction mounting plate slides smoothly upward along the guide column, driving the can lid to be lifted at a uniform speed, quickly completing the opening operation. Throughout the process, the guide column and guide sleeve cooperate to limit the movement, preventing lateral deviation and shaking.

[0072] Equivalent to the first type of lifting structure, the second type of lifting structure adopts a coaxial double chain synchronous transmission structure, which provides uniform power output, fast lifting speed, strong heavy load capacity, and is suitable for the rapid opening and closing needs of large-size and heavy-duty can lids.

[0073] In this scheme, unidirectional conveying is achieved using a check valve.

[0074] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A novel energy-saving tanning waste liquid physicochemical recycling device, comprising a treatment tank (1), characterized in that, The processing tank (1) is coaxially mounted with a main shaft (2) and a mounting cylinder (3). The main shaft (2) passes through the mounting cylinder (3) and rotates at a differential speed with the mounting cylinder (3). The lower end of the main shaft (2) is provided with a crankshaft, and a negative pressure piston assembly (11) is connected to the crankshaft. The side wall of the mounting cylinder (3) is surrounded by a negative pressure chamber (10) corresponding to the negative pressure piston assembly (11). The negative pressure piston assembly (11) is located in the negative pressure chamber (10). Each negative pressure chamber (11) is connected to a connecting pipe at its end. The side wall of the connecting pipe is connected to a one-way feed pipe (12), and the lower end is connected to a one-way discharge pipe (13). The end of the discharge pipe (13) is connected to a hollow spiral pipe (14), and a spray nozzle (15) is provided on the spiral pipe (14).

2. The novel energy-saving tanning waste liquid physicochemical recycling device according to claim 1, characterized in that, The nozzles (15) on the multiple sets of spiral tubes (14) are located at different positions and are distributed at intervals along the axial direction of the treatment tank (1).

3. The novel energy-saving tanning waste liquid physicochemical recycling device according to claim 1 or 2, characterized in that, The spray nozzle (15) is oriented toward the axis of the processing tank (1).

4. The novel energy-saving tanning waste liquid physicochemical recycling device according to claim 1, characterized in that, The mounting cylinder (3) extends upward to form an aeration cylinder (16), and the main shaft (2) passes through the aeration cylinder (16). An aeration piston assembly (17) is embedded in the aeration cylinder (16). The aeration piston assembly (17) is provided with a one-way air inlet. The aeration piston assembly (17) moves up and down back and forth with the rotation of the main shaft (2). The outer edge of the aeration cylinder (16) is provided with a one-way air supply pipe (18) corresponding to the negative pressure chamber (10). The air supply pipe (18) is connected to the corresponding negative pressure chamber (10) respectively.

5. The novel energy-saving tanning waste liquid physicochemical recycling device according to claim 4, characterized in that, The upper end face of the aeration piston assembly (17) is provided with a sliding groove (19), the sliding groove (19) has a crest and a trough, a slider (20) is slidably installed in the sliding groove (19), a connecting rod (21) is rotatably installed on the upper end of the slider (20), and the upper end of the connecting rod (21) is rotatably installed on the side wall of the main shaft (2).

6. The novel energy-saving tanning waste liquid physicochemical recycling device according to claim 5, characterized in that, The groove (19) is figure-eight shaped.

7. The novel energy-saving tanning waste liquid physicochemical recycling device according to claim 6, characterized in that, Both the connecting rod (21) and the slider (20) are provided in two sets.

8. The novel energy-saving tanning waste liquid physicochemical recycling device according to claim 4, characterized in that, The main shaft (2) and the mounting cylinder (3) are respectively provided with a first driven gear (7) and a second driven gear (8). A drive shaft (4) is rotatably installed inside the processing tank (1). The drive shaft (4) is driven by a motor located outside the processing tank (1). The drive shaft (4) is respectively provided with a first driving gear (5) meshing with the first driven gear (7) and a second driving gear (6) meshing with the second driven gear (8). The transmission ratios of the first driving gear (5) and the first driven gear (7), and the second driving gear (6) and the second driving gear (6) are different.

9. The novel energy-saving tanning waste liquid physicochemical recycling device according to claim 8, characterized in that, The gas supply pipe (18) is connected to the lower outer edge of the aeration cylinder (16).

10. The novel energy-saving tanning waste liquid physicochemical recycling device according to claim 4, characterized in that, The processing tank (1) is equipped with a pressure regulating valve at its upper end.

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