Seawater desalination air flotation pretreatment device

Abstract

The invention belongs to the technical field of seawater desalination air flotation pretreatment, and particularly relates to a seawater desalination air flotation pretreatment device which comprises a water distribution tank and an air flotation mechanism, a first water tank and a second water tank are arranged in the water distribution tank and communicated with water pipes, and water pumps are mounted on the water pipes; the water pump is fixedly mounted on the edge of the water distribution tank, an intercepting mechanism is arranged between the first water tank and the second water tank and comprises a frame, the frame is mounted between the first water tank and the second water tank, and a plurality of groups of barriers are equidistantly mounted in the frame; seawater is filtered through a plurality of groups of barriers, and floating garbage and marine organisms are intercepted in the first water tank, so that the garbage and the marine organisms are prevented from flowing into the following working procedures, the seawater treatment load of the rear end is reduced, meanwhile, the marine organisms are prevented from dying, and the purpose of saving marine resources is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of seawater desalination air flotation pretreatment, in particular to a seawater desalination air flotation pretreatment device. Background Art

[0002] Seawater desalination is a technology that removes salt and other impurities from seawater to make it meet the standards for drinking water or industrial water. When removing other impurities from seawater, flotation technology is generally used for treatment. Flotation tanks are mostly used in existing technologies.

[0003] The patent with publication number CN111747580A discloses a flotation pretreatment system for seawater desalination, including a seawater intake pump connected to a water distribution well, a plurality of sets of devices composed of fast and slow mixing tanks and flotation tanks are arranged around the water distribution well, and a sludge treatment system is connected to the bottom of the flotation tank; the scheme uses fast and slow mixing tanks to convert dirt in seawater into particles, and then mixes the particles with air-saturated water in the flotation tank. The tiny bubbles dissolved in the water will adhere to the particles in the seawater, causing the particles to float to the surface of the water body together, and the scum is collected by a skimmer on the top of the flotation tank and discharged to the sludge treatment system through a scum discharge port, with high treatment efficiency, small footprint, and reduced cost.

[0004] In the above scheme, since there is not only a large amount of garbage floating on the seawater, but also a large amount of micro and small marine organisms living in the seawater, if the seawater is directly pumped into the distribution well by the seawater intake pump, a large amount of garbage and marine organisms may be pumped into the distribution well, which not only increases the load of seawater treatment in the later stage, but also causes the death of marine organisms in the later stage of seawater treatment, resulting in the waste of marine resources. Therefore, the present invention provides a seawater desalination flotation pretreatment device. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: a seawater desalination flotation pretreatment device according to the present invention comprises a water distribution tank and an air flotation mechanism, wherein a first water tank and a second water tank are respectively arranged in the water distribution tank, the first water tank and the second water tank are both connected with a water pipe, a water pump is installed on the water pipe, and the water pump is fixedly installed on the edge of the water distribution tank, an interception mechanism is arranged between the first water tank and the second water tank, the interception mechanism comprises a frame, the frame is installed between the first water tank and the second water tank, and a plurality of groups of fences are installed at equal distances in the frame; The seawater is filtered through several groups of fences so that floating garbage and marine life are intercepted in the first water tank, thereby preventing garbage and marine life from flowing into the subsequent processes. This not only reduces the back-end seawater treatment load, but also avoids the death of marine life, thus achieving the purpose of saving marine resources.

[0007] Preferably, limiting blocks are provided on both sides of the frame, limiting grooves are provided on both sides between the first water tank and the second water tank, and the limiting blocks are slidably connected to the limiting grooves; The cooperation between the limit block and the limit groove enables the device to be installed and disassembled by plugging and unplugging, which is convenient for the staff to inspect and repair the device.

[0008] Preferably, the interception mechanism also includes two groups of transmission shafts rotatably installed in the frame, sprockets are installed in the middle of the two groups of transmission shafts, chains mesh with the two groups of sprockets, and several groups of fixing parts are distributed around the outer ring of the chain, the fixing parts are fixedly connected to the chain, and several groups of rake claws are respectively fixedly connected to the several groups of fixing parts, the upper end of the receiving fence is connected to the fence, and the lower end of the receiving fence is directly opposite to the transmission mechanism. The chain, sprocket, transmission shaft, and several groups of fixing parts are all located in a structure composed of several groups of fences, and the rake claws are inserted into the gaps between the several groups of fences. A feeding port is opened on the side of the transmission mechanism, and the lower end of the receiving fence passes through the feeding port. The transmission mechanism is fixedly installed on the second water tank; Several groups of rake claws make circular motions, and the rake claws will pick up the garbage floating near the fences, and the garbage will be thrown onto the receiving fence by the rake claws. The garbage will slide along the receiving fence to the conveying mechanism, and the garbage will be conveyed away by the conveying mechanism. Then the rake claws pass through the gaps on the receiving fences and repeat the above operations in a cycle, which not only avoids the garbage from clogging the gaps between the fences, but also realizes the cleaning of the garbage and ensures the passability of the fences to seawater.

[0009] Preferably, the fixing member includes a fixing sleeve, the fixing sleeve is fixedly mounted on the chain, a rotating tube rotatably mounted in the fixing sleeve, a rotating ring mounted on the rotating tube, the rotating ring is fixedly connected to the rake claw, and a movable shaft movably plugged into the rotating tube, both ends of the movable shaft are connected with a rectangular shaft, both ends of the fixing sleeve are provided with a rectangular slot, the rectangular shaft is movably plugged into the rectangular slot, two groups of spiral grooves are provided on the rotating tube, two groups of pins are provided on the movable shaft, the two groups of pins are respectively located in the two groups of spiral grooves, two groups of guide rings are symmetrically arranged on both sides of the chain, both ends of the guide rings are respectively fixedly connected to the two groups of transmission shafts, rollers are rotatably mounted on the ends of the rectangular shafts, the rollers are rotatably connected to the guide rings, and the guide rings are provided with raised sections for pushing the rollers; The rectangular shaft drives two groups of pins to squeeze the two groups of spiral groove walls respectively, so that the rotating tube together with the rotating ring and the rake claws rotate together, indicating the direction, so that the rake claws rotate into the structure of several groups of partition fence combinations. At this time, the feeding port opened on the side of the conveying mechanism can be directly set against the partition fence, and the garbage thrown from the rake claws will fall directly onto the conveying mechanism, which not only streamlines the receiving fence and makes the device structure more compact, but also improves the garbage conveying efficiency and improves the practicability of the device.

[0010] The beneficial effects of the present invention are as follows: 1. The seawater is filtered through several groups of fences, so that the floating garbage and marine life are intercepted in the first water tank, thereby preventing the garbage and marine life from flowing into the subsequent processes. This not only reduces the back-end seawater treatment load, but also avoids the death of marine life, thus achieving the purpose of saving marine resources.

[0011] 2. When filtering seawater, a plurality of groups of barriers start the transmission mechanism, and a group of transmission shafts are driven by a motor to rotate. A group of transmission shafts drives the corresponding sprockets to rotate, and the sprockets drive the chains together with a plurality of fixings and a plurality of rake claws to make circular motions. As the plurality of rake claws make circular motions, the rake claws will pick up the garbage floating near the barriers, and the garbage will be thrown onto the receiving bar by the rake claws. The garbage will slide along the receiving bar to the transmission mechanism, and the garbage will be transported away by the transmission mechanism. Then the rake claws pass through the gaps on the receiving bar, and the above operation is repeated in a cycle, thereby not only avoiding the garbage from blocking the gaps between the barriers, but also realizing the cleaning of the garbage, and ensuring the passing rate of the barriers to seawater.

[0012] 3. When several groups of fixing parts and several groups of rake claws make circular motions, the rollers on the fixing parts will roll against the guide rings. When the rake claws throw the garbage down, the fixing parts will move between the raised sections on the two groups of guide rings. At this time, one group of rollers will be squeezed by one group of raised sections, so that one group of rollers will drive the corresponding rectangular shafts to slide along the rectangular slots. At the same time, the rectangular shafts will drive the movable shafts to move together with the other group of rectangular shafts, and the rectangular shafts will drive the two groups of pins to squeeze the two groups of spiral groove walls respectively, so that the rotating tubes will rotate together with the rotating rings and the rake claws, so that the rake claws will rotate into the structure of several groups of fence combinations. At this time, the feeding port opened on the side of the conveying mechanism can be directly set against the fence, and the garbage thrown from the rake claws will fall directly onto the conveying mechanism, which not only simplifies the receiving fence and makes the device structure more compact, but also improves the garbage conveying efficiency and the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a partial schematic diagram of the interception mechanism of the present invention.

[0016] Figure 3 It is an overall schematic diagram of the interception mechanism of the present invention.

[0017] Figure 4 It is a schematic cross-sectional view of the entire interception mechanism of the present invention.

[0018] Figure 5 It is a schematic diagram of the combination of the partition fence, the rake claw and the receiving fence of the present invention.

[0019] Figure 6 It is a schematic diagram of the chain, fixing part and rake claw assembly of the present invention.

[0020] Figure 7 It is a cross-sectional schematic diagram of the fixing member of the present invention.

[0021] Figure 8 It is a schematic diagram of the combination of the transmission shaft, chain and fixing parts of the present invention.

[0022] Fig. 9 It is a schematic diagram of the chain, fixing part, rake claw and guide ring assembly of the present invention.

[0023] Fig.10 It is a schematic diagram of the combination of the fence, rake claw and transmission mechanism of the present invention.

[0024] In the figure: 1, water distribution tank; 2, first water tank; 3, second water tank; 32, limit groove; 4, water pipe; 5, water pump; 6, interception mechanism; 601, frame; 602, fence; 603, limit block; 604, transmission shaft; 6041, guide ring; 6042, raised section; 605, sprocket; 606, chain; 607, fixing piece; 608, rake claw; 609, receiving fence; 610, conveying mechanism; 6101, feeding port; 6071, fixing sleeve; 711, rectangular slot; 6072, rotating tube; 721, spiral groove; 6073, rotating ring; 6074, movable shaft; 741, pin shaft; 6075, rectangular shaft; 751, roller. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods. Embodiment 1

[0026] like Figure 1 and Figure 2 As shown, a seawater desalination flotation pretreatment device described in an embodiment of the present invention includes a water distribution tank 1 and a flotation mechanism 7. A first water tank 2 and a second water tank 3 are respectively arranged in the water distribution tank 1. The first water tank 2 and the second water tank 3 are both connected with a water pipe 4. A water pump 5 is installed on the water pipe 4. The water pump 5 is fixedly installed on the edge of the water distribution tank 1. An interception mechanism 6 is arranged between the first water tank 2 and the second water tank 3. The interception mechanism 6 includes a frame 601. The frame 601 is installed between the first water tank 2 and the second water tank 3. A plurality of groups of partitions 602 are installed at equal distances in the frame 601.

[0027] Specifically, the flotation mechanism 7 uses a horizontal flow flotation process to treat the seawater. The flotation mechanism 7 is provided with a fast mixing tank, a slow mixing tank and an air flotation tank. The tank body of the air flotation tank is a steel-concrete structure. There are gaps between the groups of fences 602. The water pipe 4 connected to the first water tank 2 leads to the sea, and the water pipe 4 connected to the second water tank 3 leads to the fast mixing tank in the flotation mechanism 7. When the seawater needs to be treated by the flotation process, the water pump 5 on the first water tank 2 is started. The water pump 5 pumps the seawater into the first water tank 2 through the corresponding water pipe 4. Then the seawater in the first water tank 2 flows into the second water tank 3 through the gaps between the groups of fences 602. The groups of fences 602 have a certain effect on the floating The garbage and marine life are blocked to prevent them from entering the second water tank 3, and then the water pump 5 on the second water tank 3 is started. The water pump 5 pumps the seawater in the second water tank 3 into the flotation mechanism 7 through the corresponding water pipe 4, and performs the next flotation treatment, thereby realizing the flotation pretreatment of seawater. Compared with the prior art, the seawater is filtered through a plurality of groups of fences 602, so that the floating garbage and marine life are intercepted in the first water tank 2, thereby preventing the garbage and marine life from flowing into the next process, which not only reduces the back-end load on seawater treatment, but also avoids the death of marine life, thereby achieving the purpose of saving marine resources.

[0028] Furthermore, limiting blocks 603 are provided on both sides of the frame 601 , limiting grooves 32 are provided on both sides between the first water tank 2 and the second water tank 3 , and the limiting blocks 603 are slidably connected to the limiting grooves 32 .

[0029] Specifically, the cooperation between the limiting block 603 and the limiting groove 32 enables the device to be installed and disassembled by plugging and unplugging, which is convenient for the staff to inspect and repair the device.

[0030] like Figures 3 to 5 As shown, the interception mechanism 6 also includes two groups of transmission shafts 604 rotatably installed in the frame 601, and sprockets 605 are installed in the middle of the two groups of transmission shafts 604. Chains 606 mesh with the two groups of sprockets 605, and several groups of fixing members 607 are distributed around the outer circle of the chain 606. The fixing members 607 are fixedly connected to the chain 606, and several groups of rake claws 608 are respectively fixedly connected to the several groups of fixing members 607. The upper end of the receiving fence 609 is connected to the partition fence 602, and the lower end of the receiving fence 609 is directly opposite to the conveying mechanism 610. The chain 606, sprockets 605, transmission shafts 604, and several groups of fixing members 607 are all located in a structure composed of several groups of partition fences 602. The rake claws 608 are inserted into the gaps between the several groups of partition fences 602. A feeding port 6101 is opened on the side of the conveying mechanism 610, and the lower end of the receiving fence 609 passes through the feeding port 6101. The conveying mechanism 610 is fixedly installed on the second water tank 3.

[0031] Specifically, the conveying mechanism 610 adopts a conveyor belt conveyor in the prior art. After a plurality of groups of fences 602 intercept the floating garbage for a long time, the gaps between the fences 602 will not only be blocked by garbage, affecting the passage of seawater, but also the garbage retained in the first water tank 2 will increase, and cleaning and salvaging will be time-consuming and laborious. Therefore, when the plurality of fences 602 are filtering the seawater, the transmission mechanism 610 is started, and at the same time, a group of transmission shafts 604 are driven by the motor to rotate, and a group of transmission shafts 604 drives the corresponding sprockets 605 to rotate, and the sprockets 605 drive the chains 606 together with the plurality of fixing members 607 and the plurality of rake claws 608 to make circular motions. Figure 3 The direction indicated by the middle arrow is the direction of circular motion. As several groups of rake claws 608 make circular motions, the rake claws 608 will pick up the garbage floating near the partition 602, and the garbage will be thrown onto the receiving bar 609 by the rake claws 608. The garbage will slide along the receiving bar 609 to the conveying mechanism 610, and the garbage will be conveyed away by the conveying mechanism 610. Then the rake claws 608 pass through the gap on the receiving bar 609, and the above operation is repeated in a cycle, thereby not only avoiding garbage blocking the gap between the partitions 602, but also realizing the cleaning of the garbage, ensuring the passability of the partition 602 to seawater. Embodiment 2

[0032] like Figures 6 to 10 As shown, in contrast to Example 1, another embodiment of the present invention is as follows: the fixing member 607 includes a fixing sleeve 6071, the fixing sleeve 6071 is fixedly mounted on the chain 606, a rotating tube 6072 rotatably mounted in the fixing sleeve 6071, the fixing sleeve 6071 is mounted on a rotating ring 6073 on the rotating tube 6072, the rotating ring 6073 is fixedly connected to the rake claw 608, a movable shaft 6074 movably plugged into the rotating tube 6072, both ends of the movable shaft 6074 are connected to rectangular shafts 6075, both ends of the fixing sleeve 6071 are provided with rectangular slots 711, and the rectangular The shaft 6075 is movably inserted into the rectangular slot 711, and two groups of spiral grooves 721 are opened on the rotating tube 6072. Two groups of pins 741 are arranged on the movable shaft 6074, and the two groups of pins 741 are respectively located in the two groups of spiral grooves 721. Two groups of guide rings 6041 are symmetrically arranged on both sides of the chain 606. The two ends of the guide ring 6041 are respectively fixedly connected to the two groups of transmission shafts 604. A roller 751 is rotatably installed at the end of the rectangular shaft 6075, and the roller 751 is rotatably connected to the guide ring 6041. The guide ring 6041 is provided with a raised section 6042 for pushing the roller 751.

[0033] Specifically, there are many types of garbage floating on the sea. When the rake claw 608 picks up garbage such as plastic bags, the plastic bags become heavier after being soaked in water. After the plastic bags are thrown onto the receiving bar 609, the friction between the plastic bags and the receiving bar 609 is very large, so that the plastic bags cannot slide onto the conveying mechanism 610. The plastic bags will hinder other garbage from leaving the receiving bar 609. Over time, a large amount of garbage will accumulate on the receiving bar 609, reducing the practicality of the device. Therefore, when several groups of fixing members 607 and several groups of rake claws 608 make circular motions, the rollers 751 on the fixing members 607 will roll against the guide rings 6041. When the rake claws 608 throw the garbage down, the fixing members 607 will move between the raised sections 6042 on the two groups of guide rings 6041. At this time, one group of rollers 751 is squeezed by one group of raised sections 6042, so that one group of rollers 751 drives the corresponding rectangular shafts 6075 to slide along the rectangular slots 711. At the same time, the rectangular shafts 6075 drive the movable shafts 6074 to move together with the other group of rectangular shafts 6075. The rectangular shafts 6075 drive the two groups of pins 741 to squeeze the groove walls of the two groups of spiral grooves 721 respectively, so that the rotating tubes 6072, the rotating rings 6073 and the rake claws 608 rotate together, and the rotation direction is from the bottom to the bottom. Fig.10 The middle arrow indicates the direction, which causes the rake claw 608 to rotate into a structure composed of several groups of partition bars 602. At this time, the feed port 6101 opened on the side of the conveying mechanism 610 can be directly set close to the partition bar 602, and the garbage thrown from the rake claw 608 will fall directly onto the conveying mechanism 610 until the rake claw 608 is offset from the conveying mechanism 610, and another group of rollers 751 is squeezed by another group of raised sections 6042. Similarly, the rake claw 608 will be flipped out of the structure composed of several groups of partition bars 602, and then the above operation is repeated in a cycle. Since the garbage can fall directly onto the conveying mechanism 610, not only the receiving bar 609 is streamlined to make the device structure more compact, but also the garbage conveying efficiency is improved, thereby improving the practicability of the device.

[0034] Working principle: start the water pump 5 on the first water tank 2, and the water pump 5 pumps seawater into the first water tank 2 through the corresponding water pipe 4, and then the seawater in the first water tank 2 flows into the second water tank 3 through the gaps between the plurality of groups of fences 602, and the plurality of groups of fences 602 block the floating garbage and marine life to prevent the garbage and marine life from entering the second water tank 3, and then start the water pump 5 on the second water tank 3, and the water pump 5 pumps the seawater in the second water tank 3 into the flotation mechanism 7 through the corresponding water pipe 4 for the next step of processing, thereby realizing the flotation pretreatment of seawater; When the plurality of fences 602 are filtering the seawater, the transmission mechanism 610 is started, and at the same time, a group of transmission shafts 604 are driven by the motor to rotate, and a group of transmission shafts 604 drives the corresponding sprockets 605 to rotate, and the sprockets 605 drive the chains 606 together with the plurality of fixing parts 607 and the plurality of rake claws 608 to make circular motions. Figure 3 The direction indicated by the middle arrow is the circular motion direction. As the plurality of groups of rake claws 608 make circular motions, the rake claws 608 will pick up the garbage floating near the partition 602, and the garbage will be thrown onto the receiving bar 609 by the rake claws 608. The garbage will slide along the receiving bar 609 to the conveying mechanism 610, and the garbage will be conveyed away by the conveying mechanism 610. Then the rake claws 608 pass through the gap on the receiving bar 609, and the above operation will be repeated in a cycle. When the plurality of sets of fixing members 607 and the plurality of sets of rake claws 608 make circular motions, the rollers 751 on the fixing members 607 will roll against the guide rings 6041. When the rake claws 608 throw the garbage downward, the fixing members 607 will move between the raised sections 6042 on the two sets of guide rings 6041. At this time, a set of rollers 751 is squeezed by a set of raised sections 6042, so that a set of rollers 751 drives the corresponding rectangular shafts 6075 to slide along the rectangular slots 711. At the same time, the rectangular shafts 6075 drive the movable shafts 6074 to move together with the other set of rectangular shafts 6075. The rectangular shafts 6075 drive the two sets of pins 741 to squeeze the groove walls of the two sets of spiral grooves 721 respectively, so that the rotating tubes 6072, the rotating rings 6073 and the rake claws 608 rotate together. The rotation direction is downward. Fig.10 The middle arrow indicates the direction, which causes the rake claw 608 to rotate into a structure composed of several groups of partition bars 602. At this time, the feed port 6101 opened on the side of the conveying mechanism 610 can be directly set close to the partition bars 602, and the garbage thrown from the rake claw 608 will fall directly onto the conveying mechanism 610 until the rake claw 608 is offset from the conveying mechanism 610, and another group of rollers 751 is squeezed by another group of raised sections 6042. Similarly, the rake claw 608 will flip out from the structure composed of several groups of partition bars 602, and then the above operation will be repeated in a cycle.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A seawater desalination flotation pretreatment device, comprising a water distribution tank (1) and an air flotation mechanism (7), characterized in that: The water distribution tank (1) is provided with a first water trough (2) and a second water trough (3), the first water trough (2) and the second water trough (3) are both connected with a water pipe (4), a water pump (5) is installed on the water pipe (4), and the water pump (5) is fixedly installed on the edge of the water distribution tank (1), and an interception mechanism (6) is provided between the first water trough (2) and the second water trough (3); The interception mechanism (6) comprises: A frame (601), the frame (601) being installed between the first water tank (2) and the second water tank (3); A plurality of groups of barriers (602) are installed at equal intervals in the frame (601).

2. A seawater desalination flotation pretreatment device according to claim 1, characterized in that: Limiting blocks (603) are provided on both sides of the frame (601), and limiting grooves (32) are provided on both sides between the first water trough (2) and the second water trough (3), and the limiting blocks (603) are slidably connected to the limiting grooves (32).

3. A seawater desalination flotation pretreatment device according to claim 2, characterized in that: The interception mechanism (6) further comprises: Two sets of transmission shafts (604), the two sets of transmission shafts (604) being rotatably mounted in the frame (601); A sprocket (605) is installed in the middle of the two sets of transmission shafts (604); a chain (606) engaging two sets of sprockets (605); A plurality of groups of fixing members (607) are distributed around the outer ring of the chain (606), and the fixing members (607) are fixedly connected to the chain (606); A plurality of groups of rake claws (608), wherein the plurality of groups of rake claws (608) are respectively fixedly connected to the plurality of groups of fixing members (607); A connecting fence (609), the upper end of which is connected to the partition fence (602); The lower end of the receiving bar (609) faces the conveying mechanism (610).

4. A seawater desalination flotation pretreatment device according to claim 3, characterized in that: The chain (606), sprocket (605), transmission shaft (604), and several groups of fixing parts (607) are all located in a structure composed of several groups of partitions (602), and the rake claw (608) is inserted into the gaps between the several groups of partitions (602).

5. A seawater desalination flotation pretreatment device according to claim 4, characterized in that: The conveying mechanism (610) is provided with a feeding port (6101) on the side, and the lower end of the receiving fence (609) passes through the feeding port (6101).

6. A seawater desalination flotation pretreatment device according to claim 5, characterized in that: The conveying mechanism (610) is fixedly mounted on the second water tank (3).

7. A seawater desalination flotation pretreatment device according to claim 6, characterized in that: The fixing member (607) comprises: A fixing sleeve (6071), wherein the fixing sleeve (6071) is fixedly mounted on the chain (606); Rotating the rotating tube (6072) installed in the fixing sleeve (6071); The fixing sleeve (6071) is mounted on a screw-on ring (6073) on the screw-on tube (6072), and the screw-on ring (6073) is fixedly connected to the rake claw (608); A movable shaft (6074) movably plugged into the rotary tube (6072); Both ends of the movable shaft (6074) are connected to rectangular shafts (6075).

8. A seawater desalination flotation pretreatment device according to claim 7, characterized in that: Rectangular slots (711) are provided at both ends of the fixing sleeve (6071), and the rectangular shaft (6075) is movably plugged into the rectangular slots (711).

9. A seawater desalination flotation pretreatment device according to claim 8, characterized in that: The rotating tube (6072) is provided with two groups of spiral grooves (721), and the movable shaft (6074) is provided with two groups of pins (741). The two groups of pins (741) are respectively located in the two groups of spiral grooves (721).

10. A seawater desalination flotation pretreatment device according to claim 9, characterized in that: Two groups of guide rings (6041) are symmetrically arranged on both sides of the chain (606); two ends of the guide rings (6041) are respectively fixedly connected to the two groups of transmission shafts (604); a roller (751) is rotatably mounted on the end of the rectangular shaft (6075); the roller (751) is rotatably connected to the guide ring (6041); and a raised section (6042) for pushing the roller (751) is arranged on the guide ring (6041).

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