A tannery wastewater recycling device

Abstract

The application discloses a tannery wastewater recycling device and relates to the technical field of tannery wastewater treatment.The device comprises a reaction tank, a feeding mechanism arranged on the top of the reaction tank and used for uniformly mixing alkali blocks and wastewater, a rotating mechanism arranged at the bottom of the feeding mechanism and used for accelerating the mixing, a swing mechanism arranged in the reaction tank and used for accelerating the mixing, and a barrier mechanism arranged at the bottom of the reaction tank and used for reducing the stirring of sediments.Through the cooperation of the feeding mechanism, the cylinder with a storage groove and the V-shaped hopper, precise quantitative feeding of the alkali blocks is realized, pH value fluctuation caused by excessive or insufficient feeding is avoided, the alkali blocks can be uniformly scattered into each area of the reaction tank through the synchronous rotation of the cylinder and the reciprocating movement of the moving seat on the slide rail driven by the driving motor, local high concentration is avoided, the uniformity of the materials in the initial stage of the chemical reaction is ensured, and a solid foundation is laid for subsequent efficient precipitation.

Description

Technical Field

[0001] This invention relates to the field of leather wastewater treatment technology, specifically to a leather wastewater recycling device. Background Technology

[0002] Tannery wastewater refers to the wastewater generated during the preparation and tanning stages of leather production, i.e., during wet operations. Tannery wastewater discharges are large in volume, with high pH, ​​high color, and a wide variety of complex pollutants. Major pollutants include heavy metal chromium, soluble proteins, leather dander, suspended solids, tannins, lignin, inorganic salts, oils, surfactants, dyes, and resins. Treatment of tannery wastewater mainly involves impurity precipitation pretreatment and biological treatment.

[0003] Tannery wastewater recycling systems are typically not standalone devices, but rather integrated systems. According to the latest industry practices, the first step is to collect and pretreat wastewater separately, treating different types of wastewater to avoid increasing treatment difficulty after mixing. Specifically, for chromium-containing wastewater, the pH value is adjusted by adding alkali (such as NaOH or MgO) to maintain the normal pH level of trivalent chromium (Cr³⁺). + Chromium hydroxide precipitate is formed.

[0004] The supernatant after sedimentation can be reused, and the precipitated chromium sludge can be dissolved in acid and reused in the tanning process, realizing a closed-loop recycling of chromium. In this sedimentation process, in order to ensure rapid and thorough mixing and reaction between the alkali and the wastewater, existing technologies usually install a mechanical stirring mechanism at the bottom of the reaction tank.

[0005] However, during the mixing process, the vigorous agitation of the mechanical stirring paddle inevitably stirs up the chromium hydroxide precipitate that has already settled at the bottom of the tank, suspending it in the water. This disrupts the stability of the precipitate layer, reduces the efficiency of solid-liquid separation, and results in turbid supernatant and substandard water quality, affecting subsequent reuse.

[0006] Therefore, the present invention proposes a device for recycling leather tanning wastewater to make up for and improve the shortcomings of the prior art. Summary of the Invention

[0007] In view of the above problems, the present invention provides a leather tanning wastewater recycling device, which can effectively solve the problem in the prior art where the violent agitation of the mechanical stirring paddle stirs up the chromium hydroxide precipitate that has settled at the bottom of the tank. To achieve the above objective, the embodiments of this application provide the following technical solution: This invention discloses a leather tanning wastewater recycling device, including a reaction tank. The top of the reaction tank is provided with a feeding mechanism to uniformly mix alkali blocks and wastewater. The bottom of the feeding mechanism is provided with a rotating mechanism to accelerate mixing. The inside of the reaction tank is provided with a swinging mechanism to accelerate mixing. The bottom of the reaction tank is provided with a barrier mechanism to reduce the stirring of sediment. The feeding mechanism includes slide rails symmetrically and fixedly connected to the top of the reaction tank. Movable seats are slidably sleeved on the outside of the two slide rails. A V-shaped hopper is fixedly connected between the two movable seats. A cylinder is rotatably connected inside the hopper, and both ends of the cylinder extend to the outside of the hopper. A storage tank for storing alkali blocks is symmetrically opened on the circumference of the cylinder.

[0008] Furthermore, a drive motor is fixedly connected to the side of one of the movable seats, the output end of the drive motor is rotatably connected to the slide rail, and the output end of the motor is also fixedly connected to the extension end of the cylinder.

[0009] Furthermore, the feeding mechanism also includes fixed plates symmetrically fixedly connected to both ends of the hopper, with rotating rods symmetrically rotatably connected between the two fixed plates, and an installation rod fixedly connected to the outside of each rotating rod, with a hammer fixedly connected to the bottom of the installation rod near the hopper.

[0010] Furthermore, a lever is fixedly connected to one end of the rotating rod, and a cam is fixedly connected to the outside of the extended end of the cylinder. The cam is in rolling connection with the side of the lever. A torsion spring is also sleeved on the outside of the rotating rod. One end of the torsion spring is fixedly connected to the outside of the rotating rod, and the other end of the torsion spring is fixedly connected to the side of the fixed plate.

[0011] Furthermore, the rotating mechanism includes vertical plates symmetrically fixedly connected to the sides of the hopper, with a rotating shaft rotatably connected to the bottom of the two vertical plates, a rectangular frame fixedly connected to the outside of the rotating shaft, and a filter screen fixedly connected inside the rectangular frame.

[0012] Furthermore, a second pulley is fixedly connected to one end of the rotating shaft, and a first pulley is fixedly connected to the end of the cylinder away from the cam. The second pulley and the first pulley are connected by a transmission belt.

[0013] Furthermore, the swing mechanism includes multiple hollow circular tubes that are horizontally rotatably connected inside the reaction tank, with both ends of the hollow circular tubes extending to the outside of the reaction tank. Each hollow circular tube has a through hole on its side, one end of the hollow circular tube is connected to an external gas supply device, and the other end of the hollow circular tube is fixedly connected to a first connecting rod.

[0014] Furthermore, the swing mechanism also includes a crossbar slidably connected to the outer wall of the reaction tank. The side of the crossbar is rotatably connected to the end of the first connecting rod away from the hollow round tube. Multiple protrusions are fixedly connected at equal intervals to the top of the crossbar. A roller is rolledly connected to the top of the crossbar. The roller is fixedly connected to the bottom of the moving seat. A return spring is also fixedly connected to the top of the crossbar. The end of the return spring away from the crossbar is fixedly connected to a protrusion on the outer wall of the reaction tank.

[0015] Furthermore, the barrier mechanism includes multiple rotating shafts rotatably connected to the interior of the reaction tank, and each rotating shaft is fixedly connected to a baffle on its side, with the width of the baffle being greater than the distance between adjacent rotating shafts.

[0016] Furthermore, one end of the rotating shaft extends to the outside of the reaction tank, and a second connecting rod is fixedly connected to the extended end of the rotating shaft. An L-shaped rod is rotatably connected to the end of the second connecting rod away from the rotating shaft. An electric actuator is also fixedly connected to the outer wall of the reaction tank, and the output end of the electric actuator is slidably connected to the groove of the vertical section of the L-shaped rod.

[0017] The beneficial effects of this invention are as follows: 1. This device is equipped with a feeding mechanism. By combining a cylinder with a storage trough and a V-shaped hopper, it achieves precise quantitative feeding of alkali blocks, avoiding pH fluctuations caused by overfeeding or underfeeding. At the same time, the drive motor synchronously drives the cylinder to rotate and the moving seat to reciprocate on the slide rail, so that the alkali blocks can be evenly distributed into all areas of the reaction tank, avoiding excessively high local concentrations and ensuring the uniformity of materials in the initial stage of the chemical reaction, laying a solid foundation for subsequent efficient precipitation.

[0018] 2. This device incorporates a rotating mechanism, linked to the feeding mechanism via belt drive, which rotates the rectangular frame and its internal filter screen within the wastewater. This creates a circular water flow and shear force in the upper region of the reaction tank, accelerating the dissolution of alkali lumps falling into the water and promoting initial mixing of the wastewater and reagents. The filter screen not only intercepts larger suspended solids in the water, preventing them from interfering with the reaction, but its rotating hybrid power primarily acts on the upper layer of the liquid, avoiding the sedimentation area at the bottom of the tank. Compared to traditional bottom-mounted mechanical agitators, this device maintains mixing efficiency while reducing direct shear force on the fluid at the bottom of the tank, thus lowering the possibility of sediment entrainment.

[0019] 3. This device incorporates a swing mechanism. The reciprocating motion of the moving base drives the hollow cylindrical tube to swing via a linkage mechanism, in conjunction with an external air supply device. When gas is ejected into the water through the through-holes on the side of the hollow cylindrical tube, a dynamic bubble curtain is formed. As the bubbles rise, they pull the surrounding liquid upward, creating a macroscopic liquid convection circulation, thereby achieving uniform mixing throughout the entire pool. Compared to fixed aeration pipes, the bubble distribution is more uniform and covers a larger area. Furthermore, compared to the violent agitation of mechanical paddles, the buoyancy-based mixing method of bubbles causes gentler disturbance to the liquid.

[0020] 4. This device incorporates a barrier mechanism. When wastewater enters the sedimentation stage, an L-shaped rod is driven by an electric actuator, causing the rotating shaft to rotate the baffles to a horizontal position. At this point, multiple baffles, with a width greater than their spacing, form a continuous barrier wall at the bottom of the reaction tank. This intercepts the water flow generated from the upper mixing operation and prevents the settled chromium hydroxide precipitate from being resuspended. This enhances the anti-interference ability of the sedimentation layer, ensures a clear solid-liquid separation interface, and improves the clarity of the upper clear liquid and the compliance rate of recycled water quality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of the swing mechanism in this invention.

[0024] Figure 3 This is a longitudinal sectional view of the feeding mechanism in this invention.

[0025] Figure 4 This is a three-dimensional structural diagram of the rotating mechanism in this invention.

[0026] Figure 5 This is a three-dimensional structural diagram of the feeding mechanism in this invention.

[0027] Figure 6 This is an exploded view of the rotating rod and the fixed plate in this invention.

[0028] Figure 7 This is a cross-sectional view of the blocking mechanism in this invention.

[0029] The labels in the diagram represent: 10, reaction tank; 20, feeding mechanism; 201, slide rail; 202, moving base; 203, hopper; 204, cylinder; 205, storage tank; 206, drive motor; 207, rotating rod; 208, mounting rod; 209, hammer; 210, lever; 211, cam; 212, fixed plate; 213, torsion spring; 30, rotating mechanism; 301, vertical plate; 302, rotating shaft. 303, Rectangular frame; 304, Filter screen; 305, First pulley; 306, Second pulley; 307, Transmission belt; 40, Swinging mechanism; 401, Hollow round tube; 402, First connecting rod; 403, Crossbar; 404, Protrusion; 405, Roller; 406, Return spring; 50, Barrier mechanism; 501, Rotating shaft; 502, Baffle; 503, Second connecting rod; 504, L-shaped rod; 505, Electric actuator. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] The present invention will be further described below with reference to embodiments.

[0032] See Figures 1 to 7 This embodiment of a leather tanning wastewater recycling device includes a reaction tank 10. The top of the reaction tank 10 is provided with a feeding mechanism 20 for uniformly mixing alkali blocks and wastewater. The bottom of the feeding mechanism 20 is provided with a rotating mechanism 30 for accelerating mixing. The inside of the reaction tank 10 is provided with a swinging mechanism 40 for accelerating mixing. The bottom of the reaction tank 10 is provided with a barrier mechanism 50 for reducing the stirring of sediment.

[0033] See Figure 1 , Figure 3 , Figure 5 and Figure 6 The feeding mechanism 20 includes slide rails 201 symmetrically fixedly connected to the top of the reaction tank 10. Movable seats 202 are slidably sleeved on the outside of the two slide rails 201. A V-shaped hopper 203 is fixedly connected between the two movable seats 202. A cylinder 204 is rotatably connected inside the hopper 203, and both ends of the cylinder 204 extend to the outside of the hopper 203. A storage tank 205 for storing alkali blocks is symmetrically opened on the circumference of the cylinder 204.

[0034] One of the movable seats 202 has a drive motor 206 fixedly connected to its side. The output end of the drive motor 206 is rotatably connected to the slide rail 201, and the output end of the motor is also fixedly connected to the extension end of the cylinder 204. A rack is fixedly connected to the side of the slide rail 201 along its length. A drive gear that meshes with the rack is fixedly sleeved on the output end of the drive motor 206, so that the movable seat 202 can translate along the slide rail (201).

[0035] The feeding mechanism 20 also includes fixed plates 212 symmetrically fixedly connected to both ends of the hopper 203. Rotating rods 207 are symmetrically rotatably connected between the two fixed plates 212. Each rotating rod 207 is externally fixedly connected to an installation rod 208. A hammer 209 is fixedly connected to the bottom of the installation rod 208 near the hopper 203.

[0036] One end of the rotating rod 207 is fixedly connected to a lever 210, and the extended end of the cylinder 204 is fixedly connected to a cam 211. The cam 211 is in rolling contact with the side of the lever 210. A torsion spring 213 is also sleeved on the outside of the rotating rod 207. One end of the torsion spring 213 is fixedly connected to the outside of the rotating rod 207, and the other end of the torsion spring 213 is fixedly connected to the side of the fixing plate 212. Considering the highly corrosive nature and high viscosity of suspended solids in tannery wastewater, exposed parts such as the slide rail 201 are covered with a corrosion-resistant Teflon protective shell to ensure reliable operation of the transmission mechanism.

[0037] In operation, alkali blocks are pre-placed in hopper 203. The drive motor 206 starts, causing the moving seat 202 to slide back and forth along the slide rail 201. Simultaneously, the output of the drive motor 206 drives the cylinder 204 to rotate. When one storage tank 205 rotates to the bottom opening of hopper 203, the alkali blocks fall into the wastewater by gravity, while simultaneously, the alkali blocks in hopper 203 enter another storage tank 205. Because the moving seat 202 is sliding, the alkali blocks are evenly distributed to different areas of the reaction tank 10, rather than being concentrated in one point. During the rotation of cylinder 204, the cam 211 at the extended end of cylinder 204 periodically presses the lever 210, forcing the rotating rod 207 to rotate against the force of the torsion spring 213. The rotating rod 207 drives the mounting rod 208 and the hammer 209 to swing. The hammer 209 strikes the outer wall of hopper 203, generating vibration and preventing alkali blocks from clogging hopper 203. The reciprocating motion of the movable seat 202, combined with the rotation of the cylinder 204, enables the mobile addition of alkali blocks throughout the entire reaction tank 10, solving the problem of drastic local pH fluctuations caused by traditional fixed feeding. Simultaneously, the fixed volume of the storage tank 205, combined with the rotational speed, allows for precise quantitative control of the alkali dosage. The cam 211 and hammer 209 automatically clean the hopper 203 through mechanical striking, ensuring that the alkali blocks fall smoothly and continuously into the water, guaranteeing the initial uniformity of the reaction.

[0038] See Figure 1 and Figure 4 The rotating mechanism 30 includes vertical plates 301 symmetrically fixedly connected to the side of the hopper 203. The bottom of the two vertical plates 301 are rotatably connected to a rotating shaft 302. A rectangular frame 303 is fixedly connected to the outside of the rotating shaft 302. A filter screen 304 is fixedly connected inside the rectangular frame 303.

[0039] One end of the rotating shaft 302 is fixedly connected to a second pulley 306, and the end of the cylinder 204 away from the cam 211 is fixedly connected to a first pulley 305. The second pulley 306 and the first pulley 305 are connected by a transmission belt 307. To prevent motion interference, the rotation radius of the rectangular frame 303 is less than half the internal width of the reaction tank 10, and a clearance gap is provided between the transmission belt 307 and the inner wall of the reaction tank 10.

[0040] In operation, as cylinder 204 rotates, the second pulley 306 at the other end of cylinder 204 drives the first pulley 305 to rotate via transmission belt 307, which in turn drives the rotating shaft 302 to rotate. The rotating shaft 302 drives the rectangular frame 303 at the bottom of the vertical plate 301 to move in a circular motion in the wastewater. A filter screen 304 is taut inside the rectangular frame 303. The rotation of the rectangular frame 303 creates a ring-shaped water flow and shear force in the upper region of the reaction tank 10, accelerating the dissolution of the alkali blocks. During the rotation, the filter screen 304 intercepts larger suspended solids in the water, preventing them from interfering with the chemical reaction or clogging subsequent equipment. The rotating mechanism 304 mainly acts on the upper layer of the liquid, avoiding the sedimentation area at the bottom of the tank. Compared with traditional bottom mechanical agitators, it directly reduces the shear force on the fluid at the bottom of the tank. At the same time, the shear force and the ring-shaped water flow improve the dissolution rate of the alkali blocks and the initial mixing efficiency with the wastewater. The rotating filter screen 304 performs physical interception while mixing.

[0041] See Figure 1 and Figure 2 The swing mechanism 40 includes a plurality of hollow round tubes 401 that are horizontally rotatably connected inside the reaction tank 10, and both ends of the hollow round tubes 401 extend to the outside of the reaction tank 10. Each hollow round tube 401 has a through hole on its side. One end of the hollow round tube 401 is connected to an external gas supply device, and the other end of the hollow round tube 401 is fixedly connected to a first connecting rod 402.

[0042] The swing mechanism 40 further includes a crossbar 403 slidably connected to the outer wall of the reaction tank 10. The side of the crossbar 403 is rotatably connected to the end of the first connecting rod 402 away from the hollow round tube 401. A plurality of protrusions 404 are fixedly connected at equal intervals to the top of the crossbar 403. A roller 405 is rolledly connected to the top of the crossbar 403. The roller 405 is fixedly connected to the bottom of the moving seat 202. A return spring 406 is also fixedly connected to the top of the crossbar 403. The end of the return spring 406 away from the crossbar 403 is fixedly connected to a protrusion on the outer wall of the reaction tank 10.

[0043] In operation, the rollers 405 at the bottom of the movable seat 202 reciprocate, pressing against the protrusions 404 at the top of the crossbar 403, forcing the crossbar 403 to slide up and down against the tension of the return spring 406. The reciprocating motion of the crossbar 403 is transmitted to the extension end of the hollow tube 401 via the first connecting rod 402, causing the hollow tube 401 to swing left and right around its pivot point. An external air supply device supplies air into the hollow tube 401. As the hollow tube 401 swings at the bottom of the pool, the through-holes on its side spray gas into different locations in the water, forming dynamic bubbles. As the bubbles rise, they drive the surrounding liquid upwards, creating a macroscopic liquid convection circulation, achieving uniform mixing throughout the pool. Using bubble buoyancy mixing instead of the violent agitation of mechanical blades provides gentler disturbance to the liquid and is less likely to damage the already formed flocs. Compared to fixed aeration pipes, the swinging hollow tube 401 results in a more uniform bubble distribution, a larger coverage area, and avoids mixing dead zones.

[0044] See Figure 1 and Figure 7 The barrier mechanism 50 includes multiple rotating shafts 501 rotatably connected to the interior of the reaction tank 10. Each rotating shaft 501 has a baffle 502 fixedly connected to its side, and the width of the baffle 502 is greater than the distance between adjacent rotating shafts 501. When the baffles 502 are in a horizontal state, the edges of adjacent baffles 502 overlap in a stepped manner to form a sealed barrier layer. A corrosion-resistant elastic sealing strip (e.g., neoprene rubber) is fixedly bonded to the stepped overlap of the baffles 502, and the bearing edge of the stepped overlap is provided with a downwardly sloping guide chamfer to prevent chromium hydroxide precipitate from accumulating and getting stuck at the overlap gap.

[0045] One end of the rotating shaft 501 extends to the outside of the reaction tank 10. A second connecting rod 503 is fixedly connected to the extended end of the rotating shaft 501. An L-shaped rod 504 is rotatably connected to the end of the second connecting rod 503 away from the rotating shaft 501. An electric actuator 505 is also fixedly connected to the outer wall of the reaction tank 10. The output end of the electric actuator 505 is slidably connected to the groove of the vertical section of the L-shaped rod 504. All metal parts located inside the reaction tank 10 and submerged in the liquid (including the hollow round tube 401, the rotating shaft 501 of the barrier mechanism 50, and the connecting rod assembly) are made of 316L stainless steel and have an anti-fouling and scale-inhibiting coating (such as a polytetrafluoroethylene coating) sintered on their surface to prevent mechanical jamming caused by structural corrosion or chromium sludge adhesion due to long-term immersion.

[0046] In actual operation, during the reaction mixing stage, the output end of the electric actuator 505 extends and pulls the second connecting rod 503 through the L-shaped rod 504, so that the rotating shaft 501 drives the baffle 502 to be in a vertical state, opening up the water flow channel.

[0047] When the reaction ends and the sedimentation stage begins, the output end of the electric actuator 505 retracts, driving the L-shaped rod 504 to force the rotating shaft 501 to rotate, and the baffle 502 to rotate to a horizontal position. Because the width of the baffle 502 is greater than the distance between adjacent rotating shafts 501, multiple baffles 502 are joined to form a continuous horizontal barrier wall above the bottom of the pool. The disturbance of the upper water flow impacts the barrier wall, and its energy is dissipated or its direction is changed, preventing direct impact on the sedimentation layer at the bottom of the pool. The barrier wall physically intercepts the water flow from the upper layer, preventing the settled chromium hydroxide precipitate from being resuspended, enhancing the anti-interference ability of the sedimentation layer, ensuring a clear solid-liquid separation interface, guaranteeing the clarity of the upper clear liquid, and making it easier for the recycled water quality to meet standards.

[0048] Working principle: The feeding mechanism 20 moves horizontally back and forth to achieve feeding without dead angles. At the same time, the rotating mechanism 30 stirs the upper layer of wastewater to accelerate the dissolution and mixing of alkali blocks. Meanwhile, the oscillating mechanism 40 generates bubbles to accelerate the mixing of alkali blocks. Finally, after the mixing and sedimentation are completed, the barrier mechanism 50 forms a continuous horizontal barrier wall above the bottom of the pool. The water flow disturbance in the upper layer hits the barrier wall, and the energy is consumed or changed direction, so it cannot directly impact the sedimentation layer at the bottom of the pool.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for recycling tanning wastewater, characterized in that, The reaction tank (10) includes a feeding mechanism (20) at the top of the reaction tank (10) to uniformly mix the alkali block and the wastewater, a rotating mechanism (30) at the bottom of the feeding mechanism (20) to accelerate mixing, a swinging mechanism (40) to accelerate mixing inside the reaction tank (10), and a barrier mechanism (50) at the bottom of the reaction tank (10) to reduce the stirring of sediment. The feeding mechanism (20) includes slide rails (201) symmetrically fixedly connected to the top of the reaction tank (10). Movable seats (202) are slidably sleeved on the outside of the two slide rails (201). A V-shaped hopper (203) is fixedly connected between the two movable seats (202). A cylinder (204) is rotatably connected inside the hopper (203), and both ends of the cylinder (204) extend to the outside of the hopper (203). A storage tank (205) for storing alkali blocks is symmetrically opened on the circumference of the cylinder (204).

2. The leather tanning wastewater recycling device according to claim 1, characterized in that, One of the movable seats (202) is fixedly connected to a drive motor (206) on its side. The output end of the drive motor (206) is rotatably connected to the slide rail (201). The output end of the motor is also fixedly connected to the extension end of the cylinder (204).

3. The leather tanning wastewater recycling device according to claim 1, characterized in that, The feeding mechanism (20) also includes fixed plates (212) symmetrically fixedly connected to both ends of the hopper (203), and rotating rods (207) symmetrically rotatably connected between the two fixed plates (212). Each rotating rod (207) is fixedly connected to an external mounting rod (208), and a hammer (209) is fixedly connected to the bottom of the mounting rod (208) on the side near the hopper (203).

4. The leather tanning wastewater recycling device according to claim 3, characterized in that, One end of the rotating rod (207) is fixedly connected to a lever (210), and the extension end of the cylinder (204) is fixedly connected to a cam (211). The cam (211) is rolledly connected to the side of the lever (210). A torsion spring (213) is also sleeved on the outside of the rotating rod (207). One end of the torsion spring (213) is fixedly connected to the outside of the rotating rod (207), and the other end of the torsion spring (213) is fixedly connected to the side of the fixing plate (212).

5. The leather tanning wastewater recycling device according to claim 1, characterized in that, The rotating mechanism (30) includes vertical plates (301) symmetrically fixedly connected to the side of the hopper (203), and a rotating shaft (302) is rotatably connected to the bottom of the two vertical plates (301). A rectangular frame (303) is fixedly connected to the outside of the rotating shaft (302), and a filter screen (304) is fixedly connected inside the rectangular frame (303).

6. The leather tanning wastewater recycling device according to claim 5, characterized in that, One end of the rotating shaft (302) is fixedly connected to a second pulley (306), and the end of the cylinder (204) away from the cam (211) is fixedly connected to a first pulley (305). The second pulley (306) and the first pulley (305) are connected by a transmission belt (307).

7. A leather tanning wastewater recycling device according to claim 1, characterized in that, The swing mechanism (40) includes a plurality of hollow round tubes (401) that are horizontally rotatably connected inside the reaction tank (10), and both ends of the hollow round tubes (401) extend to the outside of the reaction tank (10). Each hollow round tube (401) has a through hole on its side. One end of the hollow round tube (401) is connected to an external gas supply device, and the other end of the hollow round tube (401) is fixedly connected to a first connecting rod (402).

8. A leather tanning wastewater recycling device according to claim 7, characterized in that, The swing mechanism (40) further includes a crossbar (403) slidably connected to the outer wall of the reaction tank (10). The side of the crossbar (403) is rotatably connected to the end of the first connecting rod (402) away from the hollow round tube (401). Multiple protrusions (404) are fixedly connected at equal intervals on the top of the crossbar (403). A roller (405) is rolledly connected to the top of the crossbar (403). The roller (405) is fixedly connected to the bottom of the moving seat (202). A return spring (406) is also fixedly connected to the top of the crossbar (403). The end of the return spring (406) away from the crossbar (403) is fixedly connected to the protrusion on the outer wall of the reaction tank (10).

9. A leather tanning wastewater recycling device according to claim 1, characterized in that, The barrier mechanism (50) includes a plurality of rotating shafts (501) rotatably connected to the inside of the reaction tank (10). Each rotating shaft (501) is fixedly connected to a baffle (502) on its side, and the width of the baffle (502) is greater than the distance between adjacent rotating shafts (501).

10. A leather tanning wastewater recycling device according to claim 9, characterized in that, One end of the rotating shaft (501) extends to the outside of the reaction tank (10). A second connecting rod (503) is fixedly connected to the extended end of the rotating shaft (501). An L-shaped rod (504) is rotatably connected to the end of the second connecting rod (503) away from the rotating shaft (501). An electric push rod (505) is also fixedly connected to the outer wall of the reaction tank (10). The output end of the electric push rod (505) is slidably connected to the groove of the vertical section of the L-shaped rod (504).

Images