CN214593642U - Circulating fish culture device - Google Patents

Abstract

The utility model belongs to the technical field of aquaculture, especially, relate to a circulating fish culture device. The utility model discloses a fish bowl unit for breeding fish, it is right to be used for water among the fish bowl unit to circulate the sedimentation tank unit of purifying and get rid of the suspended solid and the bacterium in the aquaculture waste water, final cyclic utilization sets up the rain unit that contains bilayer structure simultaneously, carries out preliminary mixing and through the hole of size adjustable to the suspended substance in the waste water of discharging, and the large granule suspended solid in the waste water is smashed into the tiny particle suspended solid in mixing process, is favorable to on next step getting rid of in the absorption of sedimentation tank. The utility model has the advantages of but cyclic utilization aquaculture water resource to having reduced and having discharged sewage in to the environment, being favorable to maintaining the ecological balance of all ring edge borders, the device structural arrangement is reasonable effective simultaneously, has carried out the pretreatment to the suspension pollutant among the aquaculture wastewater and has do benefit to and filter or adsorb and get rid of, reduces the risk that blocks the filter.

Description

Circulating fish culture device

Technical Field

The invention belongs to the technical field of aquaculture, and particularly relates to a circulating fish culture device.

Background

Aquaculture means that fishes or various seafoods are cultivated in fish farms artificially opened on the bank, and can be divided into three categories of fresh water cultivation, salt water cultivation and sea surface cultivation according to the difference of cultivation water quality, and the cultivation of common fishes with louse meshes, oysters and eels is carried out. The aquaculture industry is in a transition period from a traditional high-yield stocking mode to large-scale cultivation and quality benefit transformation, but most of aquaculture still adopts a large-drainage mode, so that water resources are greatly consumed, and polluted water formed by feed residues and excrement of fishes, shrimps and crabs in the aquaculture process pollutes water, pond sediment and the like, so that the aquaculture water is increasingly eutrophicated, and the surrounding water area environment and the ecological environment are more and more damaged, therefore, an ecological aquaculture device is urgently needed in the market for reasonably utilizing the water resources and protecting the ecological environment.

The patent publication No. CN110272168A, Chinese patent application No. 2019.09.24 discloses a three-dimensional intelligent water treatment system, which comprises a pretreatment system, a flora re-cultivation system and a PH regulation system, wherein the pretreatment system, the flora re-cultivation system and the PH regulation system are sequentially communicated and arranged along a sewage inlet route, and the pretreatment system is configured to filter impurities and particles in water; the flora reproduction system comprises a sterilization unit positioned at the downstream of the pretreatment system and a probiotic breeding unit positioned at the downstream of the sterilization unit; the PH adjustment system includes a fine particle bio-sphere treatment tank located downstream of the probiotic propagation unit, the fine particle bio-sphere treatment tank configured to adjust the PH of the water. Impurities and particles are filtered through pretreatment of the aquaculture wastewater, harmful viruses and harmful objects in the water body are removed by the sterilization unit, probiotics beneficial to aquaculture are reproduced by the probiotic breeding unit, and finally the pH value of the water body is adjusted through a pH adjusting system. The purified water can be reused for aquaculture, and waste of water resources and pollution to the environment are reduced by recycling water resources.

However, the invention patent has the disadvantages that the pretreatment process of suspended pollutants in the aquaculture wastewater is not available, suspended particles are large and difficult to remove by filtration or adsorption, and the risk of blocking the filter is caused during filtration.

Disclosure of Invention

The invention aims to provide a circulating fish culture device, which can remove suspended matters and bacteria in culture wastewater through a fish tank unit for culturing fish and a sedimentation tank unit for circularly purifying water in the fish tank unit, and finally can be recycled. The device has the advantages of recycling aquaculture water resources, reducing sewage discharge to the environment, being beneficial to maintaining ecological balance of the surrounding environment, simultaneously being reasonable and effective in structural arrangement, pretreating suspended pollutants in aquaculture wastewater, being beneficial to filtering or adsorption removal, and reducing the risk of blocking a filter.

The technical scheme adopted by the invention for solving the problems is as follows: a circulating fish culture device comprises a fish tank unit for culturing fish, a sedimentation tank unit for circularly purifying water in the fish tank unit, and a rain unit connected with the fish tank unit and used for enabling water to flow into the sedimentation tank unit.

The further preferred technical scheme is as follows: the fish tank unit comprises a fish tank, an overflow pipe which penetrates through the bottom of the fish tank and is connected with the rain unit, and a fish tank sewage discharge port which is arranged at the bottom of the fish tank and is used for discharging sediments.

The further preferred technical scheme is as follows: the sedimentation tank unit comprises a first-level sedimentation tank arranged below the rain unit, a second-level sedimentation tank connected with the first-level sedimentation tank, a third-level sedimentation tank connected with the second-level sedimentation tank, a fourth-level sedimentation tank connected with the third-level sedimentation tank, a connecting pipe used for connecting the sedimentation tanks, a sewage discharge outlet arranged at the bottom of the sedimentation tank, a brush used for adsorbing suspended matters in water and arranged in the first-level sedimentation tank, a first particle machine used for adsorbing the suspended matters in water and arranged in the second-level sedimentation tank, a second particle machine used for adsorbing the suspended matters in water and arranged in the third-level sedimentation tank, the aperture of particles in the first particle machine is larger than that of particles in the second particle machine, a first bactericidal lamp arranged above the second-level sedimentation tank and behind the first third-level particle machine, and a second bactericidal lamp arranged above the sedimentation tank and behind the second particle machine, and a return pipe for connecting the four-stage sedimentation tank with the fish tank unit.

The further preferred technical scheme is as follows: the unit of drenching with rain includes the box portion, sets up the inlet pipe portion that is used for into water on the box portion sets up be used for driving in the box portion the movable rod portion that inlet pipe portion removed sets up be located in the box portion movable rod portion below is used for adjusting the movable hole board that falls the rivers velocity of flow, with movable rod portion with the rotary disk portion that movable hole board portion connects, and set up box portion below is used for falling into water the fixed orifice plate of one-level sedimentation tank.

The further preferred technical scheme is as follows: the box body part comprises a box body, a box body opening, an inner box body opening groove and a box body hole inner groove, wherein the box body opening is formed in the top of the box body and used for penetrating the water inlet pipe part, the box body opening inner groove is formed in the inner side wall of the box body opening and used for clamping the water inlet pipe part, the box body hole is formed in the box body and used for penetrating the rotary disc part, and the box body hole inner groove is formed in the inner side wall of the box body hole and used for clamping the rotary disc part.

The further preferred technical scheme is as follows: the water inlet pipe part comprises a water inlet hose connected with the bottom of the overflow pipe, a water inlet hard pipe connected with the water inlet hose, and a hard pipe clamping block arranged on the water inlet hard pipe and clamped with the inner groove of the box body opening.

The further preferred technical scheme is as follows: the movable rod part comprises a movable rod connecting block connected with the water inlet hard pipe, and is arranged in an internal thread hole in the movable rod connecting block, a movable screw rod screwed in the internal thread hole is arranged in the box body, the movable rod supporting sleeve is used for supporting the movable screw rod, a horizontal toothed bar connected with the movable screw rod is arranged on the horizontal toothed bar, a vertical toothed bar meshed with the horizontal teeth is arranged on the vertical toothed bar, a vertical first tooth meshed with the horizontal teeth is arranged on the vertical toothed bar, the other end of the vertical first tooth is used for being meshed with the vertical second tooth of the rotary disc part, and the vertical rod supporting sleeve is arranged on the outer wall of the box body and used for supporting the upper end and the lower end of the vertical toothed bar.

The further preferred technical scheme is as follows: the rotating disk part comprises a hollow sliding gear meshed with the vertical second tooth, a hollow rotating disk connected with the hollow sliding gear, a pressing block arranged on the hollow rotating disk, a hollow sliding rod connected with the hollow sliding gear relative to the other end of the hollow rotating disk, a pair of annular clamping blocks arranged on the hollow sliding rod and used for clamping the movable hole plate part, and a sliding rod clamping block penetrating through the wall of the hollow sliding rod.

The further preferred technical scheme is as follows: the rotary disk part also comprises a pressing block spring which is arranged in the hollow rotary disk and used for jacking up the pressing block, a pressing block connecting column connected with the pressing block, a rotary disk horizontal toothed bar connected with the pressing block connecting column, rotary disk horizontal teeth arranged on the rotary disk horizontal toothed bar, a rotary disk sliding gear engaged with the rotary disk horizontal teeth and connected with the sliding rod clamping block, a rotary disk screw rod arranged at the other side of the rotary disk sliding gear opposite to the sliding rod clamping block, a spring sleeve arranged in the hollow rotary disk and used for clamping the pressing block spring, and a horizontal toothed bar clamping block arranged in the hollow rotary disk and used for clamping the rotary disk horizontal toothed bar, and a rotary disk inner thread groove arranged inside the hollow rotary disk and used for screwing the rotary disk screw.

The further preferred technical scheme is as follows: the movable orifice plate part comprises an upper fixed orifice plate arranged in the box body, a movable orifice plate arranged in the box body and positioned below the upper fixed orifice plate, a fixed clamping plate arranged on the bottom surface of the movable orifice plate and clamped in the middle of the annular clamping block, and a supporting rod used for supporting the movable orifice plate to slide on the fixed clamping plate.

According to the invention, the fish tank unit for culturing fish and the sedimentation tank unit for circularly purifying water in the fish tank unit are used for removing suspended matters and bacteria in culture wastewater and finally circularly utilizing the suspended matters and the bacteria, and meanwhile, the shower unit with a double-layer structure is arranged for preliminarily mixing suspended matters in the discharged wastewater and enabling the suspended matters to pass through the holes with adjustable sizes, so that large-particle suspended matters in the wastewater are broken into small-particle suspended matters in the mixing process, and the next adsorption removal in the sedimentation tank is facilitated. The device has the advantages of recycling aquaculture water resources, reducing sewage discharge to the environment, being beneficial to maintaining ecological balance of the surrounding environment, simultaneously being reasonable and effective in structural arrangement, pretreating suspended pollutants in aquaculture wastewater, being beneficial to filtering or adsorption removal, and reducing the risk of blocking a filter.

Drawings

FIG. 1 is a schematic view showing a structure of a circulating type fish farming plant according to the present invention.

Fig. 2 is a schematic structural view of the deluge unit of the present invention.

FIG. 3 is a schematic structural view of a hollow rotary disk according to the present invention.

Fig. 4 is a schematic structural view of the horizontal rack bar of the present invention.

FIG. 5 is a schematic view of the movable screw of the present invention.

FIG. 6 is a schematic view of the position of the annular engaging block of the present invention.

FIG. 7 is a schematic view of the structure of the position of the inner groove in the hole of the box body in the present invention.

FIG. 8 is a schematic view of the structure of the internal component of the rotating disk portion of the present invention.

FIG. 9 is a schematic view of the structure inside the rotating disk portion of the present invention.

Fig. 10 is a schematic structural view of the movable orifice plate of the present invention.

Fig. 11 is a schematic view showing the structure of the inlet hose of the present invention.

FIG. 12 is a schematic view showing the structure of the opening of the container body according to the present invention.

Detailed Description

The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Example (b): as shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12, a circulating fish culture apparatus includes a fish tank unit 11 for culturing fish, a sedimentation tank unit 1 for circularly purifying water in the fish tank unit 11, and a shower unit 2 connected to the fish tank unit 11 for flowing water into the sedimentation tank unit 1.

In this embodiment, various aquatic products, such as anoplura, oysters, eels, etc., are cultured in the fish tank unit 11, the fish tank unit 11 discharges sewage into the sedimentation tank unit 1 through the deluge unit 2 and purifies the sewage, and the purified sewage returns to the fish tank unit 11 through a pipeline again, so that the water resource is reused.

The fish tank unit 11 comprises a fish tank 11a, an overflow pipe 11b which passes through the bottom of the fish tank 11a and is connected with the rain unit 2, and a fish tank sewage discharge port 11c which is arranged at the bottom of the fish tank 11a and is used for discharging sediments.

In this embodiment, overflow pipe 11b top contains the mouth, and the position of mouth is located fish bowl 11a top position down slightly, overflow pipe 11 b's position has decided the position of fish bowl 11a horizontal plane, when water in the fish bowl 11a surpasses overflow pipe 11b top mouth will follow overflow pipe 11b flows out, sets up fish bowl drain 11 c's aim at has partly suspended substance can't pass through overflow pipe 11b gets into drench unit 2, need regularly pass through the suspended solid at the bottom of the pool fish bowl drain 11c clearance, avoid fish living environment to worsen.

The sedimentation tank unit 1 comprises a first-level sedimentation tank 101 arranged below the deluge unit 2, a second-level sedimentation tank 102 connected with the first-level sedimentation tank 101, a third-level sedimentation tank 103 connected with the second-level sedimentation tank 102, a fourth-level sedimentation tank 104 connected with the third-level sedimentation tank 103, a connecting pipe 110 used for connecting the sedimentation tanks, a sewage discharge outlet 114 arranged at the bottom of the sedimentation tank, a brush 105 arranged in the first-level sedimentation tank 101 and used for adsorbing suspended matters in water, a first microparticle machine 106 arranged in the second-level sedimentation tank 102 and used for adsorbing suspended matters in water, a second microparticle machine 107 arranged in the third-level sedimentation tank 103 and used for adsorbing suspended matters in water, wherein the aperture of microparticles in the first microparticle machine 106 is larger than that of microparticles in the second microparticle machine 107, and a first bactericidal lamp 108 arranged above the second-level sedimentation tank 102 and positioned behind the first microparticle machine 106, a second germicidal lamp 109 arranged above the third sedimentation tank 103 and behind the second particle maker 107, and a return pipe 113 for connecting the fourth sedimentation tank 104 and the fish tank unit 11.

In this embodiment, the sedimentation tank unit 1 is composed of four sedimentation tanks from one stage to four stages, the sedimentation tank with a low stage has high pollutant removal efficiency but low removal degree, the sedimentation tank with a high stage has deeper pollutant removal degree but low removal efficiency, the combination of the sedimentation tanks can remove pollutants in sewage more effectively, the brush 105, the first microparticle machine 106 and the second microparticle machine 107 are filtering devices in the sedimentation tank, the brush 105 can adsorb pollutants in sewage in a large amount but only adsorb suspended matters with larger particles, and the adsorption is not stable enough and is easy to fall off, the particle size in the first microparticle machine 106 is between 60 and 150 meshes for adsorbing suspended matters not adsorbed by the brush 105, the particle size in the second microparticle machine 107 is between 120 and 200 meshes, the first sterilizing lamp 108 and the second sterilizing lamp 109 are ultraviolet sterilizing lamps respectively, wherein the power of the second sterilizing lamp 109 is higher than that of the first sterilizing lamp 108, so that the sewage enters the four-stage sedimentation tank 104 for deep sterilization, nitrifying bacteria, denitrifying bacteria, other COD degrading strains and the like are added into the four-stage sedimentation tank 104, and the COD index and the nitrogen content in the sewage are further reduced.

In addition, a lift pump is installed in the return pipe 113, and is used for pumping the sewage treated by the four-stage sedimentation tank 104 back to the fish tank 11a to complete the circulation process, and the sewage discharge port 114 is arranged to prevent a part of suspended substances from being adsorbed and sinking to the water bottom, so that the sewage discharge port 114 needs to be cleaned up periodically.

Deluge unit 2 includes box 201, sets up inlet pipe portion 202 that is used for intaking on box 201 sets up be used for driving in box 201 movable pole portion 203 that inlet pipe portion 202 removed sets up lie in box 201 movable hole board portion 204 that movable pole portion 203 below is used for adjusting the rivers velocity of falling, with movable pole portion 203 with rotary disk portion 205 that movable hole board portion 204 is connected, and set up box 201 below is used for falling into water the fixed orifice plate 206 of one-level sedimentation tank 101.

In this embodiment, the water inlet pipe portion 202 drenches the sewage in the fish tank 11a on the movable orifice plate portion 204, and the rotary plate portion 205 simultaneously controls the position of the water inlet pipe portion 202 and the size of the holes of the movable orifice plate portion 204, so as to adjust the crushing degree and the operation efficiency of suspended matters, and the uniformly mixed sewage is drenched into the primary sedimentation tank 101 through the fixed orifice plate 206.

The tank 201 includes a tank 201a, a tank opening 201b provided in the top of the tank 201a for passing through the water inlet pipe 202, a tank opening inner groove 201c provided in the inner wall of the tank opening 201b for engaging with the water inlet pipe 202, a tank hole 201d provided in the tank 201a for passing through the rotary disk 205, and a tank hole inner groove 201e provided in the inner wall of the tank hole 201d for engaging with the rotary disk 205.

The water inlet pipe part 202 comprises a water inlet hose 202a connected with the bottom of the overflow pipe 11b, a water inlet hard pipe 202b connected with the water inlet hose 202a, and a hard pipe clamping block 202c arranged on the water inlet hard pipe 202b and clamped with the inner groove 201c at the opening of the box body.

In this embodiment, the water inlet pipe 202b moves along the tank opening 201b by the force of the movable rod 203, and the pipe engaging piece 202c moves smoothly in the tank opening inner groove 201 c.

The movable rod part 203 comprises a movable rod connecting block 203a connected with the water inlet hard pipe 202b, an internal thread hole 203j arranged on the movable rod connecting block 203a, a movable screw 203b screwed with the internal thread hole 203j, a movable rod support sleeve 203c provided inside the case 201a for supporting the movable screw 203b, a horizontal rack bar 203d connected with the movable screw 203b, horizontal teeth 203e provided on the horizontal rack bar 203d, a vertical rack bar 203f engaged with the horizontal teeth 203e, a vertical first tooth 203g provided on the vertical rack bar 203f to be engaged with the horizontal teeth 203e, a vertical second tooth 203h provided on the vertical rack bar 203f at the other end opposite to the vertical first tooth 203g to be engaged with the rotary disk portion 205, and a vertical rod support sleeve 203i disposed on the outer wall of the case 201a for supporting the upper and lower ends of the vertical rack 203 f.

In this embodiment, if the water inlet hard pipe 202b is moved along the tank opening 201b, the rotating disc portion 205 is rotated to move the vertical second tooth 203h downward or upward, so as to drive the vertical first tooth 203g to move upward or downward, and then drive the horizontal tooth 203e to rotate, so as to drive the movable screw 203b to rotate, and the internal threaded hole 203j is moved leftward or rightward under the action of the movable screw 203b, so as to drive the movable rod connecting block 203a to move leftward or rightward, so as to drive the water inlet hard pipe 202b to move along the tank opening 201 b.

The rotary disk portion 205 includes a hollow slide gear 205a engaged with the vertical second tooth 203h, a hollow rotary disk 205b connected to the hollow slide gear 205a, a pressing block 205c provided on the hollow rotary disk 205b, a hollow slide rod 205d connected to the hollow slide gear 205a at the other end of the hollow rotary disk 205b, a pair of annular engaging blocks 205e provided on the hollow slide rod 205d for engaging with the movable orifice plate portion 204, and a slide rod engaging block 205f passing through the wall of the hollow slide rod 205 d.

The rotary disk part 205 further includes a pressing block spring 205g provided inside the hollow rotary disk 205b for pushing up the pressing block 205c, a pressing block connection post 205h connected to the pressing block 205c, a rotary disk horizontal rack bar 205i connected to the pressing block connection post 205h, a rotary disk horizontal rack 205j provided on the rotary disk horizontal rack bar 205i, a rotary disk slide gear 205k engaged with the rotary disk horizontal rack 205j and connected to the slide rod engaging block 205f, a rotary disk screw 205l provided on the other side of the rotary disk slide gear 205k from the slide rod engaging block 205f, a spring sleeve 205m provided inside the hollow rotary disk 205b for engaging the pressing block spring 205g, a horizontal rack bar engaging block 205n provided inside the hollow rotary disk 205b for engaging the rotary disk horizontal rack bar 205i, and a rotary disk inner thread groove 205o provided inside the hollow rotary disk 205b for screwing the rotary disk screw 205 l.

The movable orifice plate portion 204 includes an upper fixed orifice plate 204a disposed in the box body 201a, a movable orifice plate 204b disposed in the box body 201a and located below the upper fixed orifice plate 204a, a fixed engaging plate 204c disposed on the bottom surface of the movable orifice plate 204b and engaged with the middle of the annular engaging block 205e, and a support rod 204d for supporting the movable orifice plate 204b to slide thereon.

In this embodiment, when the slide rod engaging piece 205f is engaged with the inside tank hole groove 201e near the outer wall of the tank 201a, the upper fixed orifice plate 204a and the movable orifice plate 204b are completely aligned, and the effective water passing area is maximized, and when the slide rod engaging piece 205f is engaged with the inside tank hole groove 201e near the inner wall of the tank 201a, the upper fixed orifice plate 204a and the movable orifice plate 204b are staggered, and the effective water passing area is reduced.

Further, the vertical movement of the slide lever engaging piece 205f is controlled by the pressing piece 205c so that the slide lever engaging piece 205f is disengaged from the housing hole inner groove 201e, and when the pressing piece 205c is pressed down, the pressing piece spring 205g is compressed, the rotary disk horizontal rack bar 205i is moved in the pressing direction by the pressing piece connecting post 205h, the rotary disk horizontal rack 205j rotates the rotary disk sliding gear 205k, and the slide lever engaging piece 205f is moved downward by the screw engagement of the rotary disk screw 205l with the rotary disk inner thread groove 205o to be disengaged from the housing hole inner groove 201e, and at this time, the hollow rotary disk 205b is pushed, the hollow slide lever 205d is moved inward, and when the pressing piece 205c is released, the slide lever engaging piece 205f enters the housing hole inner groove 201e adjacent to the housing 201a, the handover procedure is completed.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. These are non-inventive modifications, which are intended to be protected by patent laws within the scope of the present invention.

Claims (10)

1. A circulating fish culture device comprises a fish tank unit (11) for culturing fish, and is characterized by further comprising a sedimentation tank unit (1) for circularly purifying water in the fish tank unit (11), and a rain unit (2) connected with the fish tank unit (11) and used for enabling water to flow into the sedimentation tank unit (1).

2. A circulating fish farming plant as claimed in claim 1, wherein the aquarium unit (11) comprises an aquarium (11 a), an overflow pipe (11 b) passing through the bottom of the aquarium (11 a) and connected to the shower unit (2), and an aquarium drain outlet (11 c) provided at the bottom of the aquarium (11 a) for discharging sediment.

3. A circulating fish farming plant according to claim 2, wherein the sedimentation tank unit (1) comprises a primary sedimentation tank (101) arranged below the deluge unit (2), a secondary sedimentation tank (102) connected to the primary sedimentation tank (101), a tertiary sedimentation tank (103) connected to the secondary sedimentation tank (102), a quaternary sedimentation tank (104) connected to the tertiary sedimentation tank (103), a connecting pipe (110) for connecting between the sedimentation tanks, a drain outlet (114) arranged at the bottom of the sedimentation tank, a brush (105) arranged in the primary sedimentation tank (101) for adsorbing suspended matter in water, a first microparticle machine (106) arranged in the secondary sedimentation tank (102) for adsorbing suspended matter in water, a second microparticle machine (107) arranged in the tertiary sedimentation tank (103) for adsorbing suspended matter in water, the aperture of particles in the first particle machine (106) is larger than that of particles in the second particle machine (107), a first sterilizing lamp (108) is arranged above the secondary sedimentation tank (102) and behind the first particle machine (106), a second sterilizing lamp (109) is arranged above the tertiary sedimentation tank (103) and behind the second particle machine (107), and a return pipe (113) is used for connecting the four-stage sedimentation tank (104) and the fish tank unit (11).

4. A circulating fish farming plant according to claim 3, wherein the deluge unit (2) comprises a tank body (201), a water inlet pipe portion (202) provided in the tank body (201) for allowing water to enter, a movable rod portion (203) provided in the tank body (201) for moving the water inlet pipe portion (202), a movable orifice portion (204) provided in the tank body (201) below the movable rod portion (203) for adjusting the flow rate of falling water, a rotating pan portion (205) connected to the movable rod portion (203) and the movable orifice portion (204), and a fixed orifice plate (206) provided below the tank body (201) for allowing water to fall into the primary sedimentation tank (101).

5. A circulating fish farming plant according to claim 4, wherein the tank body part (201) comprises a tank body (201 a), a tank body port (201 b) provided at the top of the tank body (201 a) for passing through the water inlet pipe part (202), a tank body port inner groove (201 c) provided on the inner side wall of the tank body port (201 b) for engaging with the water inlet pipe part (202), a tank body hole (201 d) provided on the tank body (201 a) for passing through the rotary disc part (205), and a tank body hole inner groove (201 e) provided on the inner side wall of the tank body hole (201 d) for engaging with the rotary disc part (205).

6. The circulating fish farming apparatus according to claim 5, wherein the water inlet pipe portion (202) includes a water inlet hose (202 a) connected to a bottom of the overflow pipe (11 b), a water inlet pipe (202 b) connected to the water inlet hose (202 a), and a pipe engaging piece (202 c) provided on the water inlet pipe (202 b) and engaged with the tank mouth inner groove (201 c).

7. The circulating fish culture device according to claim 6, wherein the movable rod part (203) comprises a movable rod connecting block (203 a) connected with the water inlet hard pipe (202 b), an internally threaded hole (203 j) formed in the movable rod connecting block (203 a), a movable screw (203 b) screwed with the internally threaded hole (203 j), a movable rod supporting sleeve (203 c) arranged inside the tank body (201 a) and used for supporting the movable screw (203 b), a horizontal rack (203 d) connected with the movable screw (203 b), horizontal teeth (203 e) formed on the horizontal rack (203 d), a vertical rack (203 f) meshed with the horizontal teeth (203 e), and a vertical first tooth (203 g) formed on the vertical rack (203 f) and meshed with the horizontal teeth (203 e), a vertical second tooth (203 h) provided on the vertical rack (203 f) at the other end opposite to the vertical first tooth (203 g) and engaging with the rotating disc part (205), and a vertical rod support sleeve (203 i) provided on the outer wall of the case (201 a) and supporting the upper and lower ends of the vertical rack (203 f).

8. The circulating fish farming device of claim 7, wherein the rotary disk part (205) comprises a hollow slide gear (205 a) engaged with the vertical second teeth (203 h), a hollow rotary disk (205 b) connected to the hollow slide gear (205 a), a pressing block (205 c) provided on the hollow rotary disk (205 b), a hollow slide rod (205 d) connected to the hollow slide gear (205 a) at the other end opposite to the hollow rotary disk (205 b), a pair of annular engaging blocks (205 e) provided on the hollow slide rod (205 d) for engaging the perforated plate part (204), and a slide rod engaging block (205 f) passing through the wall of the hollow slide rod (205 d).

9. The circulating fish culture device of claim 8, wherein the rotating disc part (205) further comprises a pressing block spring (205 g) disposed inside the hollow rotating disc (205 b) for jacking up the pressing block (205 c), a pressing block connecting column (205 h) connected with the pressing block (205 c), a rotating disc horizontal toothed bar (205 i) connected with the pressing block connecting column (205 h), a rotating disc horizontal toothed bar (205 j) disposed on the rotating disc horizontal toothed bar (205 i), a rotating disc sliding gear (205 k) engaged with the rotating disc horizontal toothed bar (205 j) and connected with the sliding bar engaging block (205 f), a rotating disc screw (205 l) disposed on the other side of the rotating disc sliding gear (205 k) relative to the sliding bar engaging block (205 f), a spring sleeve(s) (205 g) disposed inside the hollow rotating disc (205 b) for engaging with the pressing block spring (205 g) 205 m), a horizontal rack bar engaging block (205 n) provided inside the hollow rotary disk (205 b) for engaging the rotary disk horizontal rack bar (205 i), and a rotary disk internal thread groove (205 o) provided inside the hollow rotary disk (205 b) for screwing the rotary disk screw (205 l).

10. The circulating fish farming device according to claim 9, wherein the perforated plate portion (204) includes an upper fixed perforated plate (204 a) provided in the tank (201 a), a movable perforated plate (204 b) provided in the tank (201 a) below the upper fixed perforated plate (204 a), a fixed engaging plate (204 c) provided on a bottom surface of the movable perforated plate (204 b) and engaged in a middle of the annular engaging block (205 e), and a support rod (204 d) for supporting the movable perforated plate (204 b) to slide thereon.

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