Equipment for removing hexavalent chromium in sewage

Abstract

The invention discloses equipment for removing hexavalent chromium in sewage, and relates to the technical field of sewage treatment.The equipment comprises a treatment unit which comprises a placement plate, a transmission assembly, a transfer pipe, a plurality of sets of reduction assemblies, a limiting assembly and a connecting disc; and the limiting assembly and the reduction assembly are rotationally matched to improve the hexavalent chromium reduction efficiency. The device has the beneficial effects that the mixing rate of sewage in the reaction barrel is obviously improved, the contact between a reducing agent and hexavalent chromium is enhanced, and the speed and efficiency of reduction reaction are improved. The scraping and guiding effects of the shifting pieces effectively prevent the dispersion of flocculate, prevent the flocculate from floating or sinking at the bottom of wastewater, ensure the uniform distribution of the flocculate, relieve the burden of a filtering system, avoid the blockage of a filtering medium, and obviously improve the solid-liquid separation efficiency and the treatment effect.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a device for removing hexavalent chromium from sewage. Background Art

[0002] As an important metal element, chromium is widely used in industries such as electroplating, leather making, and steel chemical industry. The production activities of these industries generate a large amount of chromium-containing wastewater. In particular, hexavalent chromium Cr(VI), due to its strong mobility and high toxicity, often exists in aqueous solution in the form of oxygen-containing anions, and poses a much greater threat to the environment and human health than trivalent chromium Cr(III). At present, the treatment of chromium in sewage usually adopts the reduction reaction of pyrite FeS2 with hexavalent chromium Cr(VI) to convert hexavalent chromium into trivalent chromium Cr(III) with lower toxicity. In addition, the filtration capacity and treatment efficiency can be improved through the synergistic effect of the magnetic field.

[0003] However, existing equipment has some problems in the reduction reaction of pyrite and hexavalent chromium. First, the reduction reaction efficiency of pyrite and hexavalent chromium is low, resulting in a long reaction time, which affects the overall treatment efficiency. Secondly, after the initial treatment of the wastewater, condensates will be produced. These condensates may float in the wastewater or sink to the bottom of the wastewater, which is easy to disperse and is not conducive to subsequent filtration and treatment. In addition, the uneven distribution of condensates will increase the burden on the filtration system, which may cause clogging of the filter medium, further affecting the treatment effect. Summary of the invention

[0004] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a device for removing hexavalent chromium from sewage, which can solve the problem of long hexavalent chromium reduction reaction time in sewage treatment and the problem that the generated coagulants are not conducive to subsequent filtration and treatment.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a device for removing hexavalent chromium from sewage, comprising a treatment unit, including a placement plate, a transmission assembly arranged at the end of the placement plate, a transfer tube arranged at one side of the transmission assembly, a plurality of reduction assemblies arranged at the periphery of the transfer tube, a limit assembly arranged at the outer side of the reduction assembly, and a connection disk arranged at the rear end of the reduction assembly; The limiting component and the reducing component rotate in coordination with each other to improve the hexavalent chromium reduction efficiency.

[0007] As a preferred embodiment of the device for removing hexavalent chromium from sewage of the present invention, it further comprises a connecting unit, including a sewage pipe, a clean water pipe arranged at the rear end of the sewage pipe, a feed port arranged at the rear end of the clean water pipe, and a drain pipe arranged at the rear end of the feed port; The material placement port is located at the front end of the transfer tube; The drain pipe is placed at the rear end of the connection plate.

[0008] As a preferred solution of the device for removing hexavalent chromium from sewage of the present invention, wherein: the transmission assembly comprises a motor, an output shaft arranged on one side of the motor, and two sets of transmission belts arranged at both ends of the output shaft; The transmission belt drives the transfer tube and the connecting disk to rotate in the same direction.

[0009] As a preferred solution of the device for removing hexavalent chromium from wastewater according to the present invention, the reduction component includes a reaction barrel arranged on one side of the transfer tube, a discharge barrel arranged at the rear end of the reaction barrel, and a gear ring arranged around the reaction barrel.

[0010] As a preferred solution of the device for removing hexavalent chromium from sewage of the present invention, the limiting assembly comprises a large gear ring arranged on the peripheral side of the reduction assembly, and a limiting frame arranged at the bottom of the large gear ring; The large gear ring includes limiting teeth arranged on the outer side thereof; The limiting frame can limit the rotation of the limiting tooth.

[0011] As a preferred solution of the device for removing hexavalent chromium from wastewater according to the present invention, the reduction component further includes a paddle arranged in a circular array on the inner side of the reaction barrel, a filter element slidably arranged on the inner side of the paddle, and a magnetic plate fixedly arranged on the inner side of the filter element.

[0012] As a preferred solution of the device for removing hexavalent chromium from sewage of the present invention, the filter element comprises a semicircular groove slidably arranged on the inner side of the reaction barrel, a filter plate arranged on the top of the semicircular groove, and two sets of retracting elements arranged on both sides of the semicircular groove; The inner cavity of the reaction barrel and the outer wall of the semicircular groove form a first water channel, and the inner cavity of the semicircular groove forms a second water channel.

[0013] As a preferred solution of the device for removing hexavalent chromium from wastewater according to the present invention, the gear ring includes outer teeth arranged on its outer side and meshing with the large gear ring, and inner teeth arranged on its inner side.

[0014] As a preferred solution of the device for removing hexavalent chromium from sewage of the present invention, wherein: the semicircular trough includes a blocking disk arranged at one end thereof, and a water inlet disk arranged at the other end; The water inlet tray includes a water inlet hole provided through the bottom thereof; The blocking plate includes a water outlet hole extending through the bottom thereof; The blocking plate and the water inlet plate slide and clamp the filter element into the inner cavity of the reaction barrel; And the filter element always keeps the filter plate horizontal.

[0015] As a preferred solution of the device for removing hexavalent chromium from sewage of the present invention, the retracting member comprises a screw rod arranged on the side wall of the blocking plate and the water inlet plate, and a one-way gear arranged on the screw rod; The one-way gear is meshed with the internal teeth; And it is threadedly connected with the screw rod.

[0016] Beneficial effects of the present invention: The device is driven by a motor, and the transfer tube and the connecting disk rotate synchronously, so that the four groups of reduction components simultaneously revolve and rotate. This dual rotation mechanism significantly improves the mixing rate of sewage in the reaction barrel, enhances the contact between the reducing agent and hexavalent chromium, and thus greatly improves the speed and efficiency of the reduction reaction. In addition, the meshing design of the gear ring and the large gear ring enables the gear ring to rotate inside the reaction barrel while the reduction component revolves, generating a strong turbulent effect. This turbulent effect ensures the uniform mixing of sewage and reducing agent, avoids the problem of insufficient local reaction, and improves the uniformity and thoroughness of the reaction. Through the scraping and guiding effect of the paddle, the system effectively prevents the dispersion of flocculants in the first water channel, avoids the situation where flocculants float in the wastewater or sink to the bottom of the wastewater, and ensures the uniform distribution of flocculants. This not only reduces the burden of the filtration system and avoids the clogging of the filter medium, but also significantly improves the efficiency and treatment effect of solid-liquid separation, and ensures the stability and reliability of the entire system. Through the cooperation of the one-way gear and the screw, when the motor is reversed, the semicircular groove can be easily retracted. This design greatly simplifies maintenance work, allowing workers to easily clean flocculants on the filter plate, reducing maintenance time and labor intensity and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the equipment for removing hexavalent chromium from sewage according to the present invention.

[0019] Figure 2 This is an upper view of the device for removing hexavalent chromium from sewage according to the present invention.

[0020] Figure 3It is a schematic diagram of the partial structure of the equipment for removing hexavalent chromium from sewage according to the present invention.

[0021] Figure 4 It is a schematic diagram of the partial cross-sectional structure of the equipment for removing hexavalent chromium from sewage according to the present invention.

[0022] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the reduction component structure at A.

[0023] Figure 6 It is a schematic diagram of the partial cross-sectional structure of the reduction component of the present invention.

[0024] Figure 7 It is a schematic diagram of the semicircular groove structure of the present invention.

[0025] Figure 8 For the present invention Figure 6 Enlarged schematic diagram of the return part structure at point B.

[0026] In the figure: 1, processing unit; 2, connecting unit; 11, placement plate; 12, transmission assembly; 13, transfer tube; 14, reduction assembly; 15, limit assembly; 16, connection plate; 21, sewage pipe; 22, clean water pipe; 23, material placement port; 24, drainage pipe; 31, first water channel; 32, second water channel; 121, motor; 122, output shaft; 123 transmission belt; 141, reaction barrel; 142, discharge barrel; 143, gear ring; 144. paddle; 145. filter element; 146. magnetic plate; 151. large gear ring; 152. limit frame; 1431. outer teeth; 1432. inner teeth; 1451. semicircular groove; 1452. filter plate; 1453. return element; 1511. limit teeth; 14511. blocking plate; 14512. water inlet plate; 145121. water inlet hole; 145111. water outlet hole; 14531. screw rod; 14532. one-way gear. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1 Reference Figure 1~Figure 3 , which is the first embodiment of the present invention, and provides a device for removing hexavalent chromium from sewage, comprising a treatment unit 1, including a placement plate 11, a transmission assembly 12 arranged at the end of the placement plate 11, a transfer tube 13 arranged at one side of the transmission assembly 12, a plurality of reduction assemblies 14 arranged around the transfer tube 13, a limit assembly 15 arranged outside the reduction assembly 14, and a connection plate 16 arranged at the rear end of the reduction assembly 14; The limiting component 15 and the reducing component 14 rotate in coordination to improve the hexavalent chromium reduction efficiency.

[0031] Furthermore, it also includes a connecting unit 2, including a sewage pipe 21, a clean water pipe 22 arranged at the rear end of the sewage pipe 21, a feed port 23 arranged at the rear end of the clean water pipe 22, and a drain pipe 24 arranged at the rear end of the feed port 23; The material placement port 23 is located at the front end of the transfer tube 13; The drain pipe 24 is disposed at the rear end of the connection plate 16 .

[0032] Furthermore, the reduction assembly 14 includes a reaction barrel 141 disposed at one side of the transfer tube 13 , a discharge barrel 142 disposed at the rear end of the reaction barrel 141 , and a gear ring 143 disposed at the peripheral side of the reaction barrel 141 .

[0033] Furthermore, the limiting assembly 15 includes a large gear ring 151 disposed on the peripheral side of the reduction assembly 14, and a limiting frame 152 disposed at the bottom of the large gear ring 151; The large gear ring 151 includes a limiting tooth 1511 disposed on the outer side thereof; The limiting frame 152 can limit the rotation of the limiting tooth 1511 .

[0034] The transmission assembly 12 includes a motor 121, an output shaft 122 disposed at one side of the motor 121, and two sets of transmission belts 123 disposed at both ends of the output shaft 122; The transmission belt 123 drives the transfer tube 13 and the connecting plate 16 to rotate in the same direction.

[0035] It should be noted that the sewage pipe 21 and the drainage pipe 24 are both two-way pipes, which can effectively improve the efficiency of water inlet and outlet. A clean water pipe 22 is connected to the rear of the sewage pipe 21, and the clean water in the clean water pipe 22 merges with the sewage in the sewage pipe 21 again to dilute the sewage. After the diluted sewage flows through the pipeline, it passes through the feed port 23, and the feed port 23 can add a reducing agent to the diluted sewage. In addition, a group of transfer pipes 13 are connected to the rear of the feed port 23 through a flange. The transfer pipe 13 is equipped with a rolling bearing to achieve sealed rotation, and multiple groups of reduction components 14 are welded behind it. In this embodiment, there are four groups of reduction components 14, which are all fixedly connected to the peripheral side of the transfer pipe 13 by welding, so as to realize the diversion of the sewage in the transfer pipe 13 to each group of reduction components 14, so as to reduce the dispersed sewage flow, thereby improving the sewage treatment capacity of each group of reduction components 14. Efficient use of space is achieved. Each reduction component can fully play its role and improve the overall treatment capacity.

[0036] Preferably, the feed port 23 can be one or more, and by adding finely ground reducing agent / pyrite particles, catalyst / such as nanomaterials or transition metal compounds, and an appropriate amount of flocculant / polyaluminum chloride PAC or polyacrylamide PAM, the reduction reaction of hexavalent chromium and the formation and sedimentation of coagulants are promoted, which facilitates the subsequent solid-liquid separation.

[0037] Preferably, the reduction assembly 14 is composed of a reaction barrel 141 welded to the transfer tube 13, a discharge barrel 142 behind the reaction barrel 141, and a toothed ring 143 slidably engaged on the periphery of the reaction barrel 141 and the discharge barrel 142. The toothed ring 143 can dock the reaction barrel 141 and the discharge barrel 142 together and relatively seal. It is meshed with the outer large gear ring 151, and the bottom of the large gear ring 151 is erected at a specified position through a set of elevated limit frames 152. The limit frame 152 can cooperate with the limit teeth 1511 on the outer side of the large gear ring 151 through a built-in locking device, thereby limiting the rotation of the large gear ring 151.

[0038] Preferably, the bottom of the discharge barrel 141 is connected to a cap by a threaded connection, so that the discharge barrel can be easily opened to clean the debris inside. This not only simplifies maintenance work, but also extends the service life of the equipment and ensures the long-term stable operation of the system. A set of discharge pipes extends from one side of the discharge barrel 141, and the discharge pipes are connected to the rear connection plate 16 to discharge the treated sewage into the drain pipe 24.

[0039] Preferably, the transmission assembly 12 can simultaneously drive the transfer tube 13 and the connection disk 16 to rotate. The motor 121 is fixedly mounted on the placement plate 11, and two sets of transmission belts 123 are fixedly connected to the rod body of the output shaft 122 of the motor 121, and the two sets of transmission belts 123 are respectively connected to the transfer tube 13 and the connection disk 16.

[0040] When in use, when the motor 121 drives the transfer tube 13 and the connecting plate 16 to rotate simultaneously through the transmission belt 123, the four groups of reduction components 14 on the inner side of the transfer tube 13 also rotate accordingly. With the cooperation of the large ring gear 151, the reduction component 14 revolves around the large ring gear 151. Since the gear ring 143 is meshed with the large ring gear 151, the gear ring 143 will also rotate while the reduction component 14 revolves. This dual rotation mechanism allows the sewage in the reaction barrel 141 to utilize inertia during the revolution, and at the same time, the rotation of the gear ring 143 inside the reaction barrel 141 generates turbulence, significantly increasing the mixing rate. In this way, the reducing agent is more fully in contact with the hexavalent chromium, and the reaction speed is greatly increased, so that the hexavalent chromium can be quickly reduced to trivalent chromium.

[0041] In summary, the present device is driven by the motor 121, and the transfer tube 13 and the connecting disk 16 rotate synchronously, so that the four groups of reduction components 14 simultaneously revolve and rotate. This dual rotation mechanism significantly improves the mixing rate of sewage in the reaction barrel 141, enhances the contact between the reducing agent and hexavalent chromium, and thus greatly improves the speed and efficiency of the reduction reaction. In addition, the meshing design of the gear ring 143 and the large gear ring 151 enables the gear ring 143 to rotate inside the reaction barrel 141 while the reduction component 14 revolves, generating a strong turbulent effect. This turbulent effect ensures uniform mixing of sewage and reducing agent, avoids the problem of insufficient local reaction, and improves the uniformity and thoroughness of the reaction.

[0042] Example 2 Reference Figure 4~Figure 7 , which is the second embodiment of the present invention, which is different from the first embodiment in that: the reduction component 14 also includes a paddle 144 arranged in a circular array on the inner side of the reaction barrel 141, a filter 145 slidably arranged on the inner side of the paddle 144, and a magnetic plate 146 fixedly arranged on the inner side of the filter 145.

[0043] Furthermore, the filter element 145 includes a semicircular groove 1451 slidably disposed inside the reaction barrel 141 , a filter plate 1452 disposed on the top of the semicircular groove 1451 , and two sets of retracting elements 1453 disposed on both sides of the semicircular groove 1451 ; The inner cavity of the reaction barrel 141 and the outer wall of the semicircular groove 1451 form a first water channel 31 , and the inner cavity of the semicircular groove 1451 forms a second water channel 32 .

[0044] Furthermore, the semicircular groove 1451 includes a blocking plate 14511 disposed at one end thereof, and a water inlet plate 14512 disposed at the other end; The water inlet tray 14512 includes a water inlet hole 145121 penetratingly disposed at the bottom thereof; The sealing plate 14511 includes a water outlet hole 145111 penetratingly arranged at the bottom thereof; The blocking plate 14511 and the water inlet plate 14512 slide and clamp the filter element 145 into the inner cavity of the reaction barrel 141; And the filter element 145 always keeps the filter plate 1452 horizontal.

[0045] It should be noted that if Figure 4 As shown, multiple groups of circular array paddles 144 are fixedly inserted on the inner walls of the reaction barrel 141 and the discharge barrel 142. The paddles 144 have a certain curvature to facilitate the rise of the sewage. A group of filter elements 145 are slidably engaged on the inner sides of the reaction barrel 141 and the discharge barrel 142. The filter elements 145 can separate the condensed matter produced after the sewage reaction from the sewage and ensure that the condensed matter is no longer mixed with the sewage. Two groups of magnetic plates 146 are fixedly connected on both sides of the inner side of the filter element 145. The magnetic field generated by the magnetic plates 146 can induce mutual attraction between the hexavalent chromium precipitates and promote the flocculation process. This effect can significantly increase the size and density of the flocs, making them easier to separate from the wastewater. So that condensates can be formed more easily.

[0046] Preferably, the paddle 144 is a corrosion-resistant rubber sheet to reduce scratches on the outer wall of the semicircular groove 1451 and avoid affecting the movement of the retracting members 1453 on both sides of the semicircular groove 1451.

[0047] Preferably, the filter element 145 is composed of a group of semicircular grooves 1451, a filter plate 1452 on the top of the semicircular grooves 1451, and two groups of retracting parts 1453 on both sides of the circular grooves 1451. The semicircular grooves 1451 are semicircular groove-shaped, and a sealing plate 14511 and a water inlet plate 14512 with a diameter consistent with the inner diameter of the reaction barrel 141 and the discharge barrel 142 are welded at both ends, and the end close to the water inlet is the water inlet plate 14512; the bottom of the water inlet plate 14512 is provided with a water inlet hole 145121, such as Figure 7 shown.

[0048] Preferably, the semicircular groove 1451 is slidably limited inside the reaction barrel 141 and the discharge barrel 142, and the filter plate 1452 at the upper end of the semicircular groove 1451 is always kept horizontal due to the semicircular groove 1451's own gravity. The first water channel 31 formed between the outer wall of the semicircular groove 1451 and the inner cavity of the reaction barrel 141 and the discharge barrel 142, such as Figure 5 The inner side of the semicircular groove 1451 is the second water channel 32 .

[0049] When the sewage with the reducing agent added flows into the reaction barrel 141, the sewage will enter the first water channel 31 through the water inlet hole 145121 under the limiting effect of the water inlet plate 14512. Driven by the motor 121, the transfer tube 13 and the connecting plate 16 rotate synchronously, driving the reaction barrel 141 and the discharge barrel 142 to revolve around the large gear ring 151. At the same time, due to the meshing of the gear ring 143 and the large gear ring 151, the reaction barrel 141 and the discharge barrel 142 rotate relative to the semicircular groove 1451, causing the paddle 144 to move relative to each other.

[0050] In this process, the sewage originally collected in the first water channel 31 will be fully mixed and reacted under the rotation of the reduction component 14. The magnetic plate 146 inside the semicircular groove 1451 further promotes the flocculation process through the action of the magnetic field. Since the flocculation process mainly occurs in the first water channel 31, the magnetic plate 146 in the semicircular groove 1451 can reduce the direct attraction and contact with the flocculated debris, thereby avoiding excessive aggregation of the flocculated debris.

[0051] As the paddle 144 fits against the outer wall of the semicircular groove 1451 and moves relative to the sewage in the first water channel 31, the paddle 144 scrapes off the floccules produced on the outer wall of the semicircular groove 1451, drives the flocculated mixed sewage to move upward, and pours the sewage onto the filter plate 1452 to separate the floccules from the sewage into solid and liquid. The separated sewage then enters the second water channel 32, flows into the discharge bucket 142 at the rear end through the water outlet 145111, and finally flows into the drain pipe 24.

[0052] Preferably, as described in Example 1, the reduction assembly is fixedly connected to the peripheral side of the transfer tube 13 by welding, so as to realize the diversion of the sewage in the transfer tube 13 to each group of the reduction assembly 14, so as to reduce the dispersed sewage flow, thereby improving the sewage treatment capacity of each group of the reduction assembly 14. Among them, the diameter of the transfer tube 13 is larger than the diameter of the front end pipe of the reaction barrel 141 welded on the peripheral side, which makes the water flow diverted here, the flow rate decreases, and then the liquid flowing into the first water channel 31 is difficult to fill the entire first water channel 31, providing an opportunity for the paddle 144 to drive the flocculated mixed sewage to move upward to the filter plate 1452, and the sewage in the second water channel 32 is also difficult to contact the filter plate 1452, so that the flocculated mixed sewage is completely separated to avoid secondary flooding.

[0053] In summary, through the scraping and guiding effect of the paddle 144, the system effectively prevents the floccules from being dispersed in the first water channel 31, avoids the floccules from floating in the wastewater or sinking to the bottom of the wastewater, and ensures the uniform distribution of the floccules. This not only reduces the burden of the filtration system and avoids clogging of the filter medium, but also significantly improves the efficiency and treatment effect of solid-liquid separation, ensuring the stability and reliability of the entire system.

[0054] Example 3 Reference Figure 6~Figure 8 , which is the third embodiment of the present invention, is different from the previous two embodiments in that: it also includes further that the gear ring 143 includes external teeth 1431 arranged on the outer side thereof and meshing with the large gear ring 151, and internal teeth 1432 arranged on the inner side thereof.

[0055] Furthermore, the retracting member 1453 includes a screw rod 14531 disposed on the side walls of the blocking plate 14511 and the water inlet plate 14512, and a one-way gear 14532 disposed on the screw rod 14531; The one-way gear 14532 meshes with the internal teeth 1432; And it is threadedly connected with the screw rod 14531.

[0056] It should be noted that a set of retracting parts 1453 are fixedly connected to the side walls of the semicircular groove 1451. The retracting parts 1453 can allow the semicircular groove to retract. A set of one-way gears 14532 are threadedly connected to the middle of the screw rod 14531, and the one-way gear 14532 has a one-way transmission function, and can be a built-in ratchet according to the prior art. The one-way gear 14532 is limited by the toothed ring 143 in the middle position of the reaction barrel 141 and the discharge barrel 142.

[0057] When the motor 121 drives the transfer tube 13 and the connecting disk 16 to rotate forward / clockwise synchronously, the reduction component 14 begins to perform a forward revolution. With the cooperation of the large gear ring 151, each set of gear rings 143 sleeved on the reaction barrel 141 undergoes reverse motion; the paddle 144 inside the reaction barrel 141 follows the reaction barrel 141 to undergo a forward revolution, and the paddle 144 rotates forward relative to the sewage in the first water channel 31 inside the reaction barrel 141, bringing the flocculated mixed sewage to the filter plate 1452 for solid-liquid separation. The inner teeth 1432 inside the gear ring 143 will reverse the one-way gear 14532 meshed with it, and during the reversal process, the one-way gear 14532 will not drive the internal ratchet to rotate, and thus will not act on the screw 14531.

[0058] On the contrary, when the motor 121 drives the transfer tube 13 and the connecting plate 16 to rotate synchronously in reverse / counterclockwise, the reduction assembly 14 undergoes reverse revolution, and then the internal movement thereof occurs in the opposite direction to the forward rotation, and then the internal teeth 1432 will shift the one-way gear 14532 to rotate forward, and the one-way gear 14532 rotates forward, driving the internal ratchet to rotate, and then acting on the screw rod 14531. The screw rod 14531 is fixedly connected to the semicircular groove 1451, so that under the gravity applied by the semicircular groove 1451, the screw rod 14531 cannot rotate, and the one-way gear 14532 is limited in the gear ring 143, and finally the semicircular groove 1451 is retracted, which is convenient for the staff to clean.

[0059] In summary, the device can easily retract the semicircular groove 1451 when the motor 121 reverses through the cooperation of the one-way gear 14532 and the screw rod 14531. This design greatly simplifies maintenance work, allowing staff to easily clean flocculants on the filter plate 1452, reducing maintenance time and labor intensity, and extending the service life of the equipment.

[0060] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A device for removing hexavalent chromium from sewage, characterized in that: include, A processing unit (1), comprising a placement plate (11), a transmission assembly (12) arranged at an end of the placement plate (11), a transfer tube (13) arranged at one side of the transmission assembly (12), a plurality of reduction assemblies (14) arranged around the transfer tube (13), a limit assembly (15) arranged outside the reduction assembly (14), and a connection plate (16) arranged at the rear end of the reduction assembly (14); The limiting component (15) and the reducing component (14) rotate in coordination with each other to improve the hexavalent chromium reduction efficiency.

2. The device for removing hexavalent chromium from sewage according to claim 1, characterized in that: It also includes a communication unit (2), comprising a sewage pipe (21), a clean water pipe (22) arranged at the rear end of the sewage pipe (21), a material placement port (23) arranged at the rear end of the clean water pipe (22), and a drainage pipe (24) arranged at the rear end of the material placement port (23); The material placement port (23) is disposed at the front end of the transfer tube (13); The drainage pipe (24) is disposed at the rear end of the connection plate (16).

3. The device for removing hexavalent chromium from sewage as claimed in claim 2, characterized in that: The transmission assembly (12) comprises a motor (121), an output shaft (122) arranged at one side of the motor (121), and two sets of transmission belts (123) arranged at both ends of the output shaft (122); The transmission belt (123) drives the transfer tube (13) and the connecting disk (16) to rotate in the same direction.

4. The device for removing hexavalent chromium from sewage as claimed in claim 3, characterized in that: The reduction assembly (14) comprises a reaction barrel (141) arranged on one side of the transfer tube (13), a discharge barrel (142) arranged at the rear end of the reaction barrel (141), and a gear ring (143) arranged on the peripheral side of the reaction barrel (141).

5. The device for removing hexavalent chromium from sewage as claimed in claim 4, characterized in that: The limiting assembly (15) comprises a large gear ring (151) arranged on the peripheral side of the reduction assembly (14), and a limiting frame (152) arranged at the bottom of the large gear ring (151); The large gear ring (151) comprises a limiting tooth (1511) arranged on the outer side thereof; The limiting frame (152) can limit the rotation of the limiting tooth (1511).

6. The device for removing hexavalent chromium from sewage as claimed in claim 5, characterized in that: The reduction assembly (14) further comprises paddles (144) arranged in a circumferential array on the inner side of the reaction barrel (141), a filter (145) slidably arranged on the inner side of the paddles (144), and a magnetic plate (146) fixedly arranged on the inner side of the filter (145).

7. The device for removing hexavalent chromium from sewage as claimed in claim 6, characterized in that: The filter element (145) comprises a semicircular groove (1451) slidably arranged inside the reaction barrel (141), a filter plate (1452) arranged on the top of the semicircular groove (1451), and two sets of retracting elements (1453) arranged on both sides of the semicircular groove (1451); The inner cavity of the reaction barrel (141) and the outer wall of the semicircular groove (1451) form a first water channel (31), and the inner cavity of the semicircular groove (1451) forms a second water channel (32).

8. The device for removing hexavalent chromium from sewage as claimed in claim 7, characterized in that: The gear ring (143) comprises external teeth (1431) arranged on the outer side thereof and meshing with the large gear ring (151), and internal teeth (1432) arranged on the inner side thereof.

9. The device for removing hexavalent chromium from sewage as claimed in claim 8, characterized in that: The semicircular groove (1451) comprises a blocking disc (14511) arranged at one end thereof, and a water inlet disc (14512) arranged at the other end; The water inlet tray (14512) comprises a water inlet hole (145121) penetratingly arranged at the bottom thereof; The blocking disk (14511) comprises a water outlet hole (145111) penetratingly arranged at the bottom thereof; The blocking plate (14511) and the water inlet plate (14512) slide and clamp the filter element (145) into the inner cavity of the reaction barrel (141); Furthermore, the filter element (145) always keeps the filter plate (1452) horizontal.

10. The device for removing hexavalent chromium from sewage according to claim 9, characterized in that: The retracting member (1453) comprises a screw rod (14531) arranged on the side walls of the blocking plate (14511) and the water inlet plate (14512), and a one-way gear (14532) arranged on the screw rod (14531); The one-way gear (14532) meshes with the internal teeth (1432); And it is threadedly connected to the screw rod (14531).

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