A buried sewage treatment tank with an anti-extrusion damage structure

Abstract

The present invention discloses an underground sewage treatment tank with an anti-squeezing damage structure, which relates to the field of sewage treatment, and includes a fixed bottom plate and a sewage treatment tank body placed on the fixed bottom plate, the bottom end of the sewage treatment tank body is installed with a limit plate by bolts, the limit plate is arranged above the fixed bottom plate, one side of the interior of the sewage treatment tank body is separated by a first oxidation tank, and one side of the first oxidation tank is provided with a sedimentation tank, and the top end of the limit spring is hinged with a protective mechanism for protecting the sewage treatment tank body. The underground sewage treatment tank with an anti-squeezing damage structure places the sewage treatment tank body and the limit plate above the pressing plate, and the limit plate is pressed downward by the weight of the sewage treatment tank body itself, and the first protective plate is offset at an angle after being pressed downward along the limit plate, and the two first protective plates are closed and sleeved on the outside of the sewage treatment tank body to protect both ends of the sewage treatment tank body.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to an underground sewage treatment tank provided with an anti-extrusion damage structure. Background Art

[0002] Calcium carbonate is an inorganic compound and the main component of limestone, marble, etc. It is widely used in industry. During the processing of calcium carbonate, a certain amount of sewage will be produced, which needs to be treated in a sewage treatment tank to reduce the impact of sewage on the environment. At the same time, it can also effectively realize the recycling of water resources and reduce resource waste.

[0003] In the prior art, a Chinese patent with authorization announcement number CN219646929U discloses a sewage treatment device for heavy calcium carbonate production, which belongs to the technical field of sewage treatment, and comprises a filter box and a cleaning box welded on one side of the filter box. An L-shaped support frame is symmetrically arranged on the inner wall of the filter box in the horizontal direction, and the L-shaped support frame penetrates the slot to one end of the inner wall of the cleaning box away from the slot. A filter screen is arranged on the support surface of the L-shaped support frame in the horizontal direction, and a first fixing plate is connected to one end of the filter screen close to the cleaning box in the vertical direction. The bottom surface of the first fixing plate is connected to a first telescopic rod through a fixing member, and the filter screen is pulled horizontally by the first telescopic rod, and the brush is driven to move up and down by setting a second telescopic rod, and the brush is driven to move horizontally by the third telescopic rod, so as to achieve the effect of cleaning the filter screen. The sewage treatment device for heavy calcium carbonate production can not only clean large particles of impurities adhering to the filter screen, but also disassemble and replace the filter screen.

[0004] The above mechanism can clean the impurities stuck on the filter screen by utilizing a cleaning device, and at the same time disassemble the filter screen to achieve internal cleaning. However, in actual use, the calcium carbonate sewage will be precipitated separately during the treatment process, thereby separating the untreated sewage from the impurities and achieving sewage transportation. In the process of sewage treatment, the exterior of the sewage treatment tank is prone to damage due to insufficient protection, affecting the subsequent long-term treatment of the sewage.

[0005] In the prior art, a Chinese patent with authorization announcement number CN107365018A discloses an underground sewage treatment tank, comprising a double-layer tank body, an aeration device arranged above the double-layer tank body, and a dosing device arranged above the double-layer tank body and located on the right side of the aeration device; the double-layer tank body is composed of a stainless steel shell and a glass fiber layer arranged on the inner side of the stainless steel shell, and a partition is also arranged in the double-layer tank body, and the partition is provided in three pieces, which respectively divide the double-layer tank body into a sedimentation tank for sedimentation of debris, an oxidation contact tank connected to the sedimentation tank for aeration treatment, a purification tank connected to the oxidation contact tank for purification, and a water storage tank connected to the purification tank for dosing treatment; the treatment tank can quickly treat sewage by mainly using physical filtration and supplemented by chemical filtration, and reduce the use of chemical reagents, thereby improving the safety of treated water. In addition, since the glass fiber layer is corrosion-resistant, not easy to oxidize and has a smooth surface, it has the advantages of long service life and easy cleaning.

[0006] The above-mentioned mechanism realizes sewage treatment by utilizing a variety of filtering methods, but in actual use, most sewage treatment equipment utilizes similar methods to realize sewage treatment. For example, solid-liquid separation of sewage is first performed during sewage treatment, and then chemical filtration is achieved by oxidation-reduction and other methods, and finally clean water is discharged through disinfection. In actual use, when using underground sewage tanks, the surface is easily corroded due to direct contact with the soil, which affects the service life of the sewage tanks.

[0007] According to the prior art, a Chinese patent with the authorization announcement number CN116655115A discloses a sewage treatment tank, including an upper tank, a top cover, a lower tank, a circulating pump, a rotating motor, a first rotating shaft and a second rotating shaft; the top cover has a partition in the middle of the bottom surface, the partition is used to separate the sewage treatment chamber into an anoxic chamber and an aerobic chamber, and a flow gap is formed between the bottom of the partition and the bottom wall of the sewage treatment chamber; an overflow port is provided on the peripheral wall of the aerobic chamber; the circulating pump, the water inlet end is connected to the circulating water outlet pipe, and the water outlet end is connected to the circulating inlet, which is used to return the sewage in the sedimentation chamber to the anoxic chamber; the first rotating shaft is used to scrape off the sludge deposited on the bottom wall of the sewage treatment chamber; the second rotating shaft is used to scrape off the sludge deposited on the bottom wall of the sedimentation chamber. The top cover, the upper tank and the lower tank of the invention are stacked from top to bottom in sequence, which greatly reduces the floor space, and the output shaft of the rotating motor drives the first rotating shaft and the second rotating shaft to rotate, removes the sludge deposited on the bottom wall of the sewage treatment chamber and the sedimentation chamber, thereby reducing the frequency of disassembly and cleaning.

[0008] The above-mentioned mechanism scrapes off the sludge by rotating the rotating shaft, thereby reducing the deposition of sludge inside the device. However, in actual use, the sewage treatment tank generally needs to be thoroughly cleaned with a high-pressure water gun. At the same time, various parts inside the device are prone to corrosion damage when in contact with sewage for a long time, which affects the service life of the sewage tank. In addition, the outside of the sewage tank is not adequately protected. When the sewage tank is used for a long time, the outside of the tank is prone to damage due to collision. Summary of the invention

[0009] The object of the present invention is to provide an underground sewage treatment tank with an anti-extrusion damage structure to solve the problems of insufficient protection of the sewage treatment tank and corrosion caused by direct contact between the sewage tank and the soil proposed in the above background technology.

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an underground sewage treatment tank with an anti-extrusion damage structure, comprising a fixed bottom plate and a sewage treatment tank body placed on the fixed bottom plate, a limit plate being installed at the bottom end of the sewage treatment tank body by bolts, the limit plate being arranged above the fixed bottom plate, a first oxidation pool being separated on one side of the sewage treatment tank body, and a sedimentation pool being arranged on one side of the first oxidation pool, a second oxidation pool being arranged on one side of the sedimentation pool on the other side of the sewage treatment tank body, and a purification pool being arranged on one side of the second oxidation pool;

[0011] Both ends of the top of the fixed bottom plate are hinged to the limit spring, and the top of the limit spring is hinged with a protective mechanism for protecting the sewage treatment tank body, the protective mechanism includes a first protective plate, and the first protective plate is hinged to the two ends of the top of the fixed bottom plate near the limit spring, the top of the inside of the first protective plate is fixedly connected with a buffer plate, and the bottom end of the buffer plate is fixedly connected with a buffer spring, the bottom end of the buffer spring is fitted with the top of the sewage treatment tank body, one end of the first protective plate is hinged with a hinged plate, and an elastic mechanism is formed between the bottom end of the hinged plate and the limit spring, the bottom end of the first protective plate is fixedly connected to one end of the hinged plate near the hinged plate, and the bottom end of the reinforcement frame is fitted with the top of the fixed bottom plate, one side of the pressing plate is fixedly connected with a toothed plate, and one side of the toothed plate is meshed with a gear, and both ends of the gear are rotatably connected with a second protective plate, the second protective plate is sleeved on the outside of the first protective plate, the first protective plate is arranged below the second protective plates on both sides of the top of the fixed bottom plate, and the second protective plates are fixedly connected below the first protective plates at both ends of the top of the fixed bottom plate;

[0012] Both sides of the bottom end of the fixed bottom plate are fixedly connected with piston cylinders, and a limiting mechanism for performing secondary position restriction on the fixed bottom plate is arranged inside the piston cylinder.

[0013] Furthermore, pneumatic telescopic rods are fixedly connected to both sides of the middle position of the top of the fixed bottom plate, and the output end of the pneumatic telescopic rod is in contact with the bottom end of the limiting plate.

[0014] Furthermore, the limiting mechanism includes an elastic airbag, and the elastic airbag is arranged on both sides of the top of the fixed bottom plate, the top of the elastic airbag is fixedly connected to a pressing plate, and the top of the pressing plate is in contact with the bottom of the limiting plate.

[0015] Furthermore, the interior of the piston cylinder is slidably connected to a piston body, and the bottom end of the piston body is fixedly connected to a fixing rod, and the outer side of the fixing rod is fixedly connected to a limiting rod.

[0016] Furthermore, the distance between the limit rods is smaller than the distance between the bottom ends of the piston cylinders, and the limit rods are distributed at equal angles outside the fixed rod:

[0017] 1. Place the sewage treatment tank body and the limit plate on the top of the pressing plate, and use the weight of the sewage treatment tank body to press the limit plate downward, so that the first protective plate below the limit plate is stressed and the angle changes. The first protective plate is pressed down along the limit plate and the angle is offset, so that the two first protective plates are closed and sleeved on the outside of the sewage treatment tank body, thereby protecting the two ends of the sewage treatment tank body and avoiding the two ends of the sewage treatment tank body from contacting the soil. At the same time, there is a certain space between the sewage treatment tank body and the first protective plate for connecting different spaces inside the sewage treatment tank body with pipes, so that the sewage treatment tank body is protected while avoiding affecting the connection between pipes;

[0018] Furthermore, a hinged plate is hingedly connected to one end of the first protective plate. When the first protective plate loses the gravity pressure of the sewage treatment tank body above, it will restore the open state through the elastic force of the limit spring, thereby facilitating the protection of the sewage treatment tank body and disassembly and maintenance. At the same time, the bottom end of the first protective plate is also fixedly connected with a staggered reinforcement frame, which can assist in bearing the load of the sewage treatment tank body and avoid the first protective plate from breaking due to the excessive weight of the sewage treatment tank body. The pneumatic telescopic rod can also assist in supporting the limit plate when the sewage treatment tank body is pressed down, and support the middle part of the limit plate to avoid damage to the limit plate.

[0019] Furthermore, a buffer spring and a buffer plate are fixedly connected below the first protective plate, and the buffer spring and the buffer plate can buffer the force when the first protective plate is hit, thereby reducing the impact on the sewage treatment tank body. At the same time, the buffer spring and the buffer plate can also play a role in filling the gap between the first protective plate and the internal space of the sewage treatment tank body, increasing the friction of the sewage treatment tank body when it is placed, and preventing the sewage treatment tank body from being displaced due to the impact force of the sewage entering during continuous operation;

[0020] 2. When the sewage treatment tank body presses the pressing plate due to gravity, the pressing plate will squeeze out part of the gas inside the elastic airbag, and the pressing plate will drop with the squeezing force, so that the tooth plate is driven to move downward, and the gear meshing with the tooth plate is driven to rotate, so that the second protective plate rotatably connected at both ends of the gear is turned over and protects the sewage treatment tank body from both sides. At the same time, the second protective plate will also be engaged with the outside of the first protective plate to lock the position of the first protective plate, thereby avoiding the angle deflection of the first protective plate caused by damage to the hinge during use;

[0021] Furthermore, when the pressing plate is pressed, the gas inside the elastic airbag is discharged, and at the same time, the gas inside the elastic airbag is transported to the inside of the piston cylinder through the hose, so that the piston body inside the piston cylinder is pushed out by the gas, thereby pushing the fixing rod out and engaging with the soil. At the same time, the limiting rod arranged on the outside of the fixing rod can be inserted into the soil at different angles, thereby playing a reinforcing role. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the front view and cross-section of the three-dimensional structure of the present invention;

[0023] Figure 2 is a schematic diagram of the three-dimensional structure of the first protective plate of the present invention;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the sewage treatment tank of the present invention;

[0025] Figure 4 is a schematic diagram of the three-dimensional structure of the first protective plate of the present invention;

[0026] Figure 5 is a schematic diagram of the three-dimensional structure of the second protective plate of the present invention;

[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 7 It is a three-dimensional structural schematic diagram of the limiting mechanism of the present invention;

[0029] Figure 8It is a schematic diagram of a side-view cross-sectional three-dimensional structure of the present invention;

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the buffer plate of the present invention;

[0031] Fig.10 It is a three-dimensional structural schematic diagram of the limiting mechanism of the present invention;

[0032] Fig.11 It is a schematic diagram of the three-dimensional structure of the angle adjustment mechanism of the present invention.

[0033] In the figure: 1. fixed bottom plate; 2. sewage treatment tank body; 3. limit plate; 4. first oxidation tank; 5. sedimentation tank; 6. second oxidation tank; 7. purification tank; 8. first protective plate; 9. limit spring; 10. reinforcement frame; 11. elastic airbag; 12. pressing plate; 13. tooth plate; 14. gear; 15. second protective plate; 16. first protective plate; 17. piston cylinder; 18. piston body; 19. fixed rod; 20. limit rod; 21. pneumatic telescopic rod; 22. buffer spring; 23. buffer plate; 24. hinged plate; 25. second protective plate. DETAILED DESCRIPTION

[0034] Embodiment 1:

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 , Fig. 9 and Fig.11The technical solution shown is to solve the problem that the sewage treatment tank is easily corroded by the humid environment after being buried in the soil. The buried sewage treatment tank with an anti-extrusion damage structure discloses a protective mechanism, including a fixed bottom plate 1 and a sewage treatment tank body 2 placed on the fixed bottom plate 1. The bottom end of the sewage treatment tank body 2 is fixed with a limit plate 3 by bolts. The limit plate 3 is arranged above the fixed bottom plate 1. One side of the sewage treatment tank body 2 is separated by a first oxidation tank 4, and a sedimentation tank 5 is arranged on one side of the first oxidation tank 4. A second oxidation tank 6 is arranged on one side of the sedimentation tank 5 on the other side of the sewage treatment tank body 2, and a purification tank 7 is arranged on one side of the second oxidation tank 6. The two ends of the top of the fixed bottom plate 1 are hinged with limit springs 9, and the top of the limit spring 9 is hinged with a A protective mechanism for protecting the treatment tank body 2 includes a first protective plate 8, and the first protective plate 8 is hinged to the two ends of the top of the fixed base plate 1 near the limit spring 9, the top of the inside of the first protective plate 8 is fixedly connected with a buffer plate 23, and the bottom end of the buffer plate 23 is fixedly connected with a buffer spring 22, the bottom end of the buffer spring 22 is in contact with the top of the sewage treatment tank body 2, one end of the first protective plate 8 is hinged with a hinged plate 24, and an elastic mechanism is formed between the bottom end of the hinged plate 24 and the limit spring 9, the bottom end of the first protective plate 8 is fixedly connected to one end of the hinged plate 24, and the bottom end of the reinforcement frame 10 is in contact with the top of the fixed base plate 1, and the pneumatic telescopic rod 21 is fixedly connected to both sides of the middle position of the top of the fixed base plate 1, and the output end of the pneumatic telescopic rod 21 is in contact with the bottom end of the limit plate 3.

[0036] In this example, the sewage that has undergone a solid-liquid separation is transported to the interior of the first oxidation tank 4, and then transported to the interior of the sedimentation tank 5 after oxidation-reduction treatment. The sewage is precipitated with impurities in the sedimentation tank 5 to undergo a secondary solid-liquid separation. The treated water is then transported to the interior of the second oxidation tank 6 through the through hole above the partition plate for a secondary oxidation-reduction treatment, and finally transported to the interior of the purification tank 7. Disinfectants are added through the pipeline, so that the clean water is output through the pipeline. The fixed bottom plate 1 and the protective mechanism above are placed in a pit dug in advance, and the fixed bottom plate 1 and the protective mechanism are placed stably. The sewage treatment tank body 2 and the limit plate 3 are placed above the pressing plate 12. The limit plate 3 is pressed downward by the weight of the sewage treatment tank body 2, so that the first protective plate 8 below the limit plate 3 is subjected to force and the angle is changed. The first protective plate 8 is offset after being pressed down along the limit plate 3, so that the two first protective plates 8 are closed and sleeved on the outside of the sewage treatment tank body 2, so as to protect the two ends of the sewage treatment tank body 2 and prevent the two ends of the sewage treatment tank body 2 from contacting the soil. At the same time, a certain space is reserved between the sewage treatment tank body 2 and the first protective plate 8 for different spaces inside the sewage treatment tank body 2. The pipeline is connected, and one end of the first protective plate 8 is hinged with a hinged plate 24. When the first protective plate 8 loses the gravity pressure of the sewage treatment tank body 2 above, it will restore the open state through the elastic force of the limit spring 9, so as to facilitate the protection of the sewage treatment tank body 2 and the disassembly and maintenance. At the same time, the bottom end of the first protective plate 8 is also fixedly connected with a staggered reinforcement frame 10, which can assist in bearing the load of the sewage treatment tank body 2 and avoid the problem of the first protective plate 8 breaking caused by the excessive weight of the sewage treatment tank body 2. The pneumatic telescopic rod 21 can also play a role in assisting the support of the limit plate 3 when the sewage treatment tank body 2 is pressed down. The middle part of the limit plate 3 is supported to avoid damage to the limit plate 3. A buffer spring 22 and a buffer plate 23 are fixedly connected below the first protective plate 8. The buffer spring 22 and the buffer plate 23 can buffer the force when the first protective plate 8 is hit, thereby reducing the impact on the sewage treatment tank body 2. At the same time, the buffer spring 22 and the buffer plate 23 can also fill the internal gap between the first protective plate 8 and the sewage treatment tank body 2, increase the friction of the sewage treatment tank body 2 when it is placed, and avoid the sewage treatment tank body 2 from being displaced due to the impact force of the sewage entering during continuous operation.

[0037] Embodiment 2:

[0038] like Figure 1 , Figure 3 , Figure 5 , Figure 6 , Figure 8 and Fig.11The technical solution shown is based on Example 1, in order to solve the following problem: the buried sewage treatment tank with an anti-extrusion damage structure discloses a rotary adjustment mechanism, a tooth plate 13 is fixedly connected to one side of the pressing plate 12, and a gear 14 is meshed on one side of the tooth plate 13, and both ends of the gear 14 are rotatably connected to a second protective plate 15, the second protective plate 15 is sleeved on the outside of the first protective plate 8, and a first protective plate 16 is arranged under the second protective plate 15 on both sides of the top of the fixed bottom plate 1, and a second protective plate 25 is fixedly connected under the first protective plate 8 at both ends of the top of the fixed bottom plate 1.

[0039] In this example, when the sewage treatment tank body 2 presses the pressing plate 12 due to gravity, the pressing plate 12 will squeeze out a part of the gas inside the elastic airbag 11, and at the same time, the pressing plate 12 drops with the squeezing force, so that the tooth plate 13 is driven to move downward, and the gear 14 meshing with the tooth plate 13 is driven to rotate, so that the second protective plate 15 rotatably connected to both ends of the gear 14 is flipped over and protects the sewage treatment tank body 2 from both sides. At the same time, the second protective plate 15 will also be engaged with the outside of the first protective plate 8 to lock the position of the first protective plate 8, thereby avoiding the angle deflection of the first protective plate 8 caused by damage to the hinge during use.

[0040] Embodiment three:

[0041] like Figure 1 , Figure 7 and Fig.10 The technical solution shown is to solve the following problem: the buried sewage treatment tank with an anti-extrusion damage structure discloses a limiting mechanism, both sides of the bottom end of the fixed bottom plate 1 are fixedly connected with a piston cylinder 17, and the interior of the piston cylinder 17 is provided with a limiting mechanism for secondary position limitation of the fixed bottom plate 1, the limiting mechanism includes an elastic airbag 11, and the elastic airbag 11 is arranged on both sides of the top end of the fixed bottom plate 1, the top of the elastic airbag 11 is fixedly connected with a pressing plate 12, and the top of the pressing plate 12 is fitted with the bottom end of the limiting plate 3, the interior of the piston cylinder 17 is slidably connected with a piston body 18, and the bottom end of the piston body 18 is fixedly connected with a fixing rod 19, the outer side of the fixing rod 19 is fixedly connected with a limiting rod 20, the distance between the limiting rods 20 is smaller than the distance between the bottom ends of the piston cylinder 17, and the limiting rods 20 are equiangularly distributed on the outside of the fixed rod 19.

[0042] In this example, when the pressing plate 12 is pressed, the gas inside the elastic airbag 11 is discharged, and at the same time, the gas inside the elastic airbag 11 is transported to the inside of the piston cylinder 17 through a hose, so that the piston body 18 inside the piston cylinder 17 is pushed out by the gas, thereby pushing out the fixing rod 19 and engaging it with the soil. At the same time, the limiting rod 20 arranged on the outside of the fixing rod 19 can be inserted into the soil at different angles, thereby playing a reinforcing role.

Claims

1. An underground sewage treatment tank provided with an anti-squeezing damage structure, comprising a fixed bottom plate (1) and a sewage treatment tank body (2) placed above the fixed bottom plate (1), a limit plate (3) being installed at the bottom end of the sewage treatment tank body (2) by means of bolts, the limit plate (3) being arranged above the fixed bottom plate (1), a first oxidation pool (4) being separated on one side of the sewage treatment tank body (2), and a sedimentation pool (5) being arranged on one side of the first oxidation pool (4), a second oxidation pool (6) being arranged on one side of the sedimentation pool (5) on the other side of the sewage treatment tank body (2), and a purification pool (7) being arranged on one side of the second oxidation pool (6); Features: Both ends of the top of the fixed bottom plate (1) are hinged to limit springs (9), and the top of the limit spring (9) is hinged to a protective mechanism for protecting the sewage treatment tank body (2), the protective mechanism comprising a first protective plate (8), and the first protective plate (8) is hinged to the top of the fixed bottom plate (1) near the two ends of the limit spring (9), the top of the first protective plate (8) is fixedly connected to a buffer plate (23), and the bottom of the buffer plate (23) is fixedly connected to a buffer spring (22), the bottom end of the buffer spring (22) is in contact with the top of the sewage treatment tank body (2), one end of the first protective plate (8) is hinged to a hinge plate (24), and an elastic mechanism is formed between the bottom end of the hinge plate (24) and the limit spring (9), the bottom end of the first protective plate (8) near the hinge plate (24) is fixedly connected to a reinforcing frame (10), and the bottom end of the reinforcing frame (10) is in contact with the top of the fixed bottom plate (1), and the bottom of the fixed bottom plate (1) is fixedly connected to the bottom of the fixed bottom plate (1). The piston cylinder (17) is fixedly connected to both sides of the end, and a limiting mechanism for performing secondary position limiting on the fixed base plate (1) is arranged inside the piston cylinder (17), the limiting mechanism comprises an elastic airbag (11), and the elastic airbag (11) is arranged on both sides of the top of the fixed base plate (1), the top of the elastic airbag (11) is fixedly connected to a pressing plate (12), and the top of the pressing plate (12) is in contact with the bottom of the limiting plate (3), and one side of the pressing plate (12) is in contact with the bottom of the limiting plate (3). A toothed plate (13) is fixedly connected to the side, and a gear (14) is meshed on one side of the toothed plate (13), and both ends of the gear (14) are rotatably connected to second protective plates (15), the second protective plates (15) are sleeved on the outside of the first protective plate (8), first protective plates (16) are arranged below the second protective plates (15) on both sides of the top end of the fixed base plate (1), and second protective plates (25) are fixedly connected below the first protective plates (8) on both ends of the top end of the fixed base plate (1).

2. The underground sewage treatment tank with an anti-extrusion damage structure according to claim 1 is characterized in that: Pneumatic telescopic rods (21) are fixedly connected to both sides of the middle position of the top of the fixed bottom plate (1), and the output end of the pneumatic telescopic rod (21) fits with the bottom end of the limit plate (3).

3. The underground sewage treatment tank with an anti-extrusion damage structure according to claim 1 is characterized in that: The interior of the piston cylinder (17) is slidably connected to a piston body (18), and the bottom end of the piston body (18) is fixedly connected to a fixing rod (19), and the outer side of the fixing rod (19) is fixedly connected to a limiting rod (20).

4. The underground sewage treatment tank with an anti-extrusion damage structure according to claim 3 is characterized in that: The distance between the limiting rods (20) is smaller than the distance between the bottom ends of the piston cylinder (17), and the limiting rods (20) are distributed at equal angles outside the fixing rod (19).

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