A novel septic tank for special-purpose vehicles

Abstract

This utility model belongs to the field of flocculation tank technology and discloses a novel flocculation reaction tank for special-purpose vehicles, including a reaction cylinder with a reaction tank inside. A protective cover is installed on the top of the reaction cylinder, covering the upper end of the reaction tank. A stirring mechanism is installed inside the reaction tank, with its upper end extending to the top of the protective cover and connected to a drive motor fixedly installed on the top of the protective cover. A feeding assembly is located above the protective cover. Due to the feeding assembly, the feeding mechanism, in conjunction with the feeding pipe and connecting pipe, can extend to the bottom of the reaction tank. With the assistance of a feeding rod, flocculant can be added to different depths within the reaction tank from above the reaction cylinder, allowing the added flocculant to quickly contact and mix with the surrounding sewage, thereby effectively improving the flocculation reaction treatment efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of flocculation tank technology, specifically a new type of sewage flocculation reaction tank for special vehicles. Background Technology

[0002] The flocculation reaction equipment in special vehicles is an important component of pool-type sewage treatment. Fine particulate matter and colloids in wastewater maintain a relatively stable state in the water body due to electrostatic repulsion caused by surface charge, making them difficult to remove from the water by natural sedimentation. They can only be broken through the stable state by coagulation and sedimentation process to complete aggregation and settling. The coagulation process includes two parts: coagulation and flocculation.

[0003] The utility model patent with application number 202420254903.1 discloses a flocculation sedimentation tank. By adding a mixing and stirring mechanism to the flocculation reaction tank, the flocculant and sewage are fully mixed, ensuring the quality and efficiency of the flocculation reaction and sedimentation. However, its design can only add flocculant to the top surface of the sewage. Sewage density is often high, and flocculant is not easy to fall. According to practical experience, controlling the stirring mechanism to have lateral and oblique upward thrust further hinders the fall of flocculant and greatly limits the mixing efficiency of flocculant and sewage. Therefore, it is necessary to develop a new type of sewage flocculation reaction tank for special vehicles to solve the shortcomings of the existing technology. Utility Model Content

[0004] To address the problems mentioned in the background section, this invention provides a novel flocculation reaction tank for special-purpose vehicles, which has the advantages of high efficiency and good effect.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a novel flocculation reaction tank for sewage of special-purpose vehicles, comprising a reaction cylinder, wherein a reaction tank is provided inside the reaction cylinder, a protective cover is installed on the top of the reaction cylinder covering the upper end of the reaction tank, a stirring mechanism is provided inside the reaction tank, the upper end of the stirring mechanism extends to the top of the protective cover and is connected to a drive motor fixedly installed on the top of the protective cover, a feeding component is provided above the protective cover, and the lower end of the feeding component is inserted into the middle of the stirring mechanism and extends to the bottom of the reaction tank;

[0006] The feeding assembly includes an inclined feeding pipe positioned above the protective cover. The lower end of the feeding pipe is connected to a connecting pipe, the lower end of which is inserted into the interior of the stirring mechanism and extends to the bottom of the reaction tank. The outer surface of the connecting pipe has several discharge ports located inside the stirring mechanism. A feeding rod is sleeved inside the connecting pipe. Several conveying grooves on the outer surface of the feeding rod correspond one-to-one with the discharge ports. The upper end of the feeding rod passes through the connecting pipe and the feeding pipe and is fixedly connected to an operating head. The lower end of the feeding rod is rotatably connected to the lower end of the connecting pipe.

[0007] Preferably, the stirring mechanism includes a transmission component disposed inside the reaction tank and outside the connecting pipe. The lower end of the transmission component is rotatably connected to the bottom of the reaction tank via a bearing. The upper end of the transmission component extends above the protective cover and is connected to the transmission belt at the output end of the drive motor. An adjustment locking component is connected to the top of the transmission component.

[0008] Preferably, the transmission assembly includes a transmission rod rotatably connected to the middle of the reaction tank, a fixed stirring rod fixedly sleeved at the bottom of the outer surface of the transmission rod, and a plurality of adjustable stirring rods connected to the outside of the transmission rod. The ends of the outer surfaces of the adjustable stirring rods and the fixed stirring rods away from the transmission rod extend to the inner wall of the reaction tank.

[0009] Preferably, the upper end of the transmission rod extends above the protective cover and is fixedly connected to a transmission wheel. The transmission wheel is driven and sleeved in the transmission belt at the output end of the drive motor. The upper end of the transmission rod is rotatably sleeved inside the protective cover via a shaft. The adjustment and locking assembly is installed on the top of the transmission wheel and sleeved on the outer surface of the connecting pipe.

[0010] Preferably, the outer surface of the transmission rod is provided with a plurality of evenly distributed sliding grooves, and a plurality of sliders are slidably engaged inside the sliding grooves. A plurality of connecting sleeves are movably sleeved on the outside of the transmission rod. The end of the adjustable stirring rod near the transmission rod is fixedly connected to the outer surface of the connecting sleeve. A plurality of linkage sleeves are sleeved between the transmission rod and the connecting pipe. The sliders are fixedly connected between the connecting sleeves and the linkage sleeves.

[0011] Preferably, the inner wall of the linkage sleeve and the outer surface of the connecting pipe are both provided with threads, and the linkage sleeve and the connecting pipe are connected to each other by the threads.

[0012] Preferably, the adjustment locking assembly includes an adjustment knob sleeved on the outside of the connecting tube, a positioning spring connected to the top of the adjustment knob, and two locking rings provided between the bottom of the adjustment knob and the top of the transmission wheel. The facing surfaces of the two locking rings are inserted into each other, and the facing back surfaces of the two locking rings are respectively fixedly connected to the transmission wheel and the adjustment knob.

[0013] The outer surface of the connecting tube is provided with a plurality of limiting slots that are evenly distributed inside the adjusting knob. A limiting block is slidably engaged inside the limiting slot. One end of the limiting block extends to the outside of the limiting slot and is fixedly connected to the inside of the adjusting knob.

[0014] Preferably, a flow guide is connected between the feeding pipe and the connecting pipe. The flow guide has a conical structure. The upper end of the flow guide is connected to the bottom of the feeding pipe, and the lower end of the flow guide is connected to the connecting pipe. The flow guide is fixedly connected to the bottom of the feeding pipe. A shaft sealing ring that abuts against the upper end of the positioning spring is connected between the flow guide and the connecting pipe. The flow guide and the connecting pipe are sealed together by the shaft sealing ring.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. Due to the setting of the feeding component, the feeding mechanism of this utility model can extend to the bottom of the reaction tank with the cooperation of the feeding pipe and the connecting pipe. With the cooperation of the feeding rod, the flocculant can be added to different depths in the reaction tank from the top of the reaction cylinder, so that the added flocculant can quickly come into contact with and mix with the surrounding sewage, thereby effectively improving the flocculation reaction treatment efficiency.

[0017] 2. Due to the setting of the adjustment locking component, under the cooperation of the transmission component and the elastic action of the positioning spring, the two locking rings can be locked together by adjusting the knob, thereby achieving the purpose of locking the transmission component and the connecting pipe, ensuring that the two rotate synchronously, and avoiding the situation where the height of the adjustable stirring rod is accidentally changed due to relative rotation, thus ensuring the stability of the stirring and mixing after adjustment.

[0018] 3. Due to the design of the chute and slider, and with the cooperation of the connecting sleeve and the linkage sleeve, the connecting pipe can control the linkage sleeve, slider and connecting sleeve to move up and down as a whole through the thread, thereby achieving the purpose of controlling the overall height of several adjustable stirring rods, so that they can be adapted to the height of the sewage in the reaction tank, and ensure that the stirring effect is fully applied to the sewage. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a front view of the present invention;

[0021] Figure 3 This is a sectional view of the front of the present invention;

[0022] Figure 4 for Figure 3 A partial schematic diagram;

[0023] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle;

[0024] Figure 6 for Figure 4 A magnified view of a portion of point B in the middle;

[0025] Figure 7 This is a schematic diagram of the feeding assembly of this utility model;

[0026] Figure 8 This is a schematic diagram of the feeding rod of this utility model;

[0027] Figure 9 This is a block diagram illustrating the operation of this utility model in the control system of environmentally friendly special vehicles.

[0028] In the diagram: 1. Reaction cylinder; 2. Protective cover; 3. Stirring mechanism; 31. Transmission assembly; 311. Transmission rod; 312. Adjustable stirring rod; 313. Fixed stirring rod; 314. Transmission wheel; 315. Slide groove; 316. Sliding block; 317. Connecting sleeve; 318. Linkage sleeve; 319. Thread; 32. Adjustment and locking assembly; 321. Adjustment knob; 322. Locking ring; 323. Positioning spring; 324. Limiting groove; 325. Limiting block; 4. Feeding assembly; 41. Feeding pipe; 42. Connecting pipe; 43. Discharge port; 44. Feeding rod; 45. Conveying trough; 46. Control head; 47. Flow guide; 48. Shaft seal ring; 5. Reaction tank. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1 to 9 As shown, this utility model provides a novel flocculation reaction tank for special vehicles, including a reaction cylinder 1, a reaction tank 5 inside the reaction cylinder 1, a protective cover 2 covering the upper end of the reaction tank 5 installed on the top of the reaction cylinder 1, a stirring mechanism 3 inside the reaction tank 5, the upper end of the stirring mechanism 3 extending to the top of the protective cover 2 and connected to a drive motor fixedly installed on the top of the protective cover 2, a feeding component 4 above the protective cover 2, the lower end of the feeding component 4 inserted into the middle of the stirring mechanism 3 and extending to the bottom of the reaction tank 5;

[0031] The feeding assembly 4 includes an inclined feeding pipe 41 positioned above the protective cover 2. A connecting pipe 42 is connected to the lower end of the feeding pipe 41. The lower end of the connecting pipe 42 is inserted into the interior of the stirring mechanism 3 and extends to the bottom of the reaction tank 5. Several discharge ports 43 are formed on the outer surface of the connecting pipe 42, located inside the stirring mechanism 3. A feeding rod 44 is sleeved inside the connecting pipe 42. Several conveying grooves 45, corresponding one-to-one with the discharge ports 43, are formed on the outer surface of the feeding rod 44. The upper end of the feeding rod 44 passes through the connecting pipe 42 and the feeding pipe 41. The feed pipe 41 is fixedly connected to the operating head 46, and the lower end of the feeding rod 44 is rotatably connected to the lower end of the connecting pipe 42. Due to the setting of the feeding component 4, the feeding mechanism can extend to the bottom of the reaction tank 5 with the cooperation of the feeding pipe 41 and the connecting pipe 42. Thus, with the cooperation of the feeding rod 44, the flocculant can be added to different depths in the reaction tank 5 from the top of the reaction cylinder 1, so that the added flocculant can quickly come into contact with and mix with the surrounding sewage, thereby effectively improving the flocculation reaction treatment efficiency.

[0032] The stirring mechanism 3 includes a transmission component 31 located inside the reaction tank 5 and outside the connecting pipe 42. The lower end of the transmission component 31 is rotatably connected to the bottom of the reaction tank 5 via a bearing. The upper end of the transmission component 31 extends above the protective cover 2 and is connected to the transmission belt at the output end of the drive motor. An adjustment locking component 32 is connected to the top of the transmission component 31.

[0033] The transmission assembly 31 includes a transmission rod 311 rotatably connected to the middle of the reaction tank 5. A fixed stirring rod 313 is fixedly sleeved on the bottom of the outer surface of the transmission rod 311. Several adjustable stirring rods 312 are connected to the outside of the transmission rod 311. The ends of the adjustable stirring rods 312 and the fixed stirring rods 313 that are away from the transmission rod 311 extend to the inner wall of the reaction tank 5. The fixed stirring rods 313 can ensure that the bottom of the reaction tank 5 can always be stirred, while the several adjustable stirring rods 312 can facilitate the adjustment of its overall height to suit different sewage levels in the reaction tank 5, ensuring that the stirring effect is fully applied to the sewage and improving the energy conversion rate of the stirring drive.

[0034] The upper end of the transmission rod 311 extends above the protective cover 2 and is fixedly connected to the transmission wheel 314. The transmission wheel 314 is sleeved in the transmission belt at the output end of the drive motor. The upper end of the transmission rod 311 is rotatably sleeved inside the protective cover 2 via a shaft. The adjusting locking assembly 32 is installed on the top of the transmission wheel 314 and sleeved on the outer surface of the connecting pipe 42.

[0035] The transmission rod 311 has several evenly distributed grooves 315 axially opened on its outer surface. Several sliders 316 are slidably engaged inside the grooves 315. Several connecting sleeves 317 are movably sleeved on the outside of the transmission rod 311. One end of the adjustable stirring rod 312 near the transmission rod 311 is fixedly connected to the outer surface of the connecting sleeve 317. Several linkage sleeves 318 are sleeved between the transmission rod 311 and the connecting pipe 42. The sliders 316 are fixedly connected between the connecting sleeves 317 and the linkage sleeves 318. Due to the arrangement of the grooves 315 and the sliders 316, with the cooperation of the connecting sleeves 317 and the linkage sleeves 318, the connecting pipe 42 can control the linkage sleeves 318, the sliders 316 and the connecting sleeves 317 to move up and down as a whole through the thread 319. This achieves the purpose of controlling the overall height of the adjustable stirring rods 312, so that they can be adapted to the height of the sewage in the reaction tank 5, ensuring that the stirring effect is fully applied to the sewage.

[0036] The inner wall of the linkage sleeve 318 and the outer surface of the connecting pipe 42 are both provided with threads 319, and the linkage sleeve 318 and the connecting pipe 42 are connected to each other through the threads 319.

[0037] The adjusting locking assembly 32 includes an adjusting knob 321 sleeved on the outside of the connecting tube 42. A positioning spring 323 is connected to the top of the adjusting knob 321. Two locking rings 322 are provided between the bottom of the adjusting knob 321 and the top of the transmission wheel 314. The opposing surfaces of the two locking rings 322 are inserted into each other, and the opposing back surfaces of the two locking rings 322 are respectively fixedly connected to the transmission wheel 314 and the adjusting knob 321.

[0038] The outer surface of the connecting pipe 42 is provided with several limiting slots 324 evenly distributed inside the adjusting knob 321. The limiting slots 324 are slidably engaged with limiting blocks 325. One end of the limiting block 325 extends to the outside of the limiting slots 324 and is fixedly connected to the inside of the adjusting knob 321. Due to the setting of the adjusting locking component 32, with the cooperation of the transmission component 31 and the elastic action of the positioning spring 323, the two locking rings 322 can be locked together by adjusting the knob 321, thereby achieving the purpose of locking the transmission component 31 and the connecting pipe 42, ensuring that the two rotate synchronously, and avoiding the situation where the height of the adjustable stirring rod 312 is accidentally changed due to the relative rotation of the two, thereby ensuring the stability of the stirring and mixing after adjustment.

[0039] A flow guide 47 is connected between the feed pipe 41 and the connecting pipe 42. The flow guide 47 has a conical structure. The upper end of the flow guide 47 is connected to the bottom of the feed pipe 41, and the lower end of the flow guide 47 is connected to the connecting pipe 42. The flow guide 47 is fixedly connected to the bottom of the feed pipe 41. A shaft sealing ring 48 that abuts against the upper end of the positioning spring 323 is connected between the flow guide 47 and the connecting pipe 42. The flow guide 47 and the connecting pipe 42 are sealed together by the shaft sealing ring 48. Due to the setting of the flow guide 47, it can be ensured that the inner diameter of the feed pipe 41 and the connecting pipe 42 can be matched with the outer diameter of the feeding rod 44, ensuring that there is space between the feed pipe 41 and the feeding rod 44 for the flocculant to enter. The inner wall of the connecting pipe 42 and the outer surface of the feeding rod 44 are in close contact with each other, which can ensure that the flocculant in the conveying tank 45 can follow it down the inner wall of the connecting pipe 42 to the lower end of the reaction tank 5.

[0040] Working principle and usage process of this utility model:

[0041] After the wastewater enters the environmental protection vehicle control system, it first passes through the primary separation tank, then through the rotor pump and the corresponding flow meter, and then enters the reaction cylinder 1. After flocculation and reaction in the reaction cylinder 1, it is discharged and then enters the screw press to separate organic matter through the motor and the corresponding flow meter. The water produced is then pumped into the sodium filtration system through the high pressure pump and then discharged, or used for irrigation.

[0042] While the wastewater enters the reaction cylinder 1 for flocculation, the two types of agents, A and B, need to be made into liquid solutions and injected into the feeding assembly 4 as needed through the control of the solenoid valve. After passing through the feeding assembly 4 and the stirring assembly 3, the wastewater enters the reaction tank 5 in the reaction cylinder 1.

[0043] When it is necessary to start the reaction cylinder 1, first adjust the height of several adjustable stirring rods 312 according to the amount of sewage in the reaction tank 5, so that the adjustable stirring rods 312 and the fixed stirring rods 313 are distributed between the bottom and the top of the sewage.

[0044] Specifically, moving the adjusting knob 321 upwards separates the two locking rings 322 at its bottom, compressing the positioning spring 323. Then, rotating the adjusting knob 321 allows the connecting pipe 42 to rotate under the cooperation of the limiting slot 324 and the limiting block 325. Since the rotation of the connecting pipe 42 can drive several linkage sleeves 318 to move through the thread 319 between it and the linkage sleeve 318, and under the restriction of the sliding groove 315 and the slider 316, it drives the corresponding connecting sleeve 317 and its external adjustable stirring rod 312 to move up and down along the inside of the reaction tank 5, thereby changing the overall height of the fixed stirring rod 313 and several adjustable stirring rods 312 to adapt to the height of the sewage. Finally, releasing the adjusting knob 321 allows the adjusting knob 321 to move downwards under the elastic restoring force of the positioning spring 323, and the two locking rings 322 to re-engage.

[0045] Flocculant is injected into the feed pipe 41, allowing it to slide down into the guide shroud 47. Then, the feeding rod 44 is moved down by the control head 46. When the conveying trough 45 on the outside of the feeding rod 44 passes the guide shroud 47, it is filled with flocculant. Then, under the restriction of the connecting pipe 42, it moves down into the reaction tank 5 with the feeding rod 44. Finally, the feeding rod 44 is rotated by the control head 46, which causes the conveying trough 45 on its surface to drive the flocculant to rotate along the inside of the connecting pipe 42 until the conveying trough 45 is aligned with the discharge port 43. At this time, the flocculant in the conveying trough 45 can slide down its inner wall and enter the transmission rod 311 through the discharge port 43. Finally, it comes into contact with the sewage at the corresponding depth in the reaction tank 5 through the chute 315.

[0046] At the same time, the drive motor is turned on, causing the drive wheel 314 to rotate via the transmission belt. The rotation of the drive wheel 314 drives the drive rod 311 to rotate, which in turn drives the fixed stirring rod 313 and several adjustable stirring rods 312 to rotate, thereby completing the mixing.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel flocculation reaction tank for sewage in special-purpose vehicles, comprising a reaction cylinder (1), characterized in that: The reaction cylinder (1) has a reaction tank (5) inside. A protective cover (2) covering the upper end of the reaction tank (5) is installed on the top of the reaction cylinder (1). A stirring mechanism (3) is provided inside the reaction tank (5). The upper end of the stirring mechanism (3) extends to the top of the protective cover (2) and is connected to a drive motor fixedly installed on the top of the protective cover (2). A feeding component (4) is provided above the protective cover (2). The lower end of the feeding component (4) is inserted into the middle of the stirring mechanism (3) and extends to the bottom of the reaction tank (5). The feeding assembly (4) includes a feeding pipe (41) that is inclined and located above the protective cover (2). The lower end of the feeding pipe (41) is connected to a connecting pipe (42). The lower end of the connecting pipe (42) is inserted into the interior of the stirring mechanism (3) and extends to the bottom of the reaction tank (5). The outer surface of the connecting pipe (42) is provided with several discharge ports (43) located inside the stirring mechanism (3). The inside of the connecting pipe (42) is fitted with a feeding rod (44). The outer surface of the feeding rod (44) has several conveying grooves (45) that correspond one-to-one with the discharge ports (43). The upper end of the feeding rod (44) passes through the connecting pipe (42) and the feeding pipe (41) and is fixedly connected to an operating head (46). The lower end of the feeding rod (44) is rotatably connected to the lower end of the connecting pipe (42).

2. The novel septic tank for special-purpose vehicles according to claim 1, characterized in that: The stirring mechanism (3) includes a transmission assembly (31) disposed inside the reaction tank (5) and outside the connecting pipe (42). The lower end of the transmission assembly (31) is rotatably connected to the bottom of the reaction tank (5) via a bearing. The upper end of the transmission assembly (31) extends above the protective cover (2) and is connected to the transmission belt at the output end of the drive motor. An adjustment locking assembly (32) is connected to the top of the transmission assembly (31).

3. The novel septic tank for special-purpose vehicles according to claim 2, characterized in that: The transmission assembly (31) includes a transmission rod (311) rotatably connected to the middle of the reaction tank (5). A fixed stirring rod (313) is fixedly sleeved on the bottom of the outer surface of the transmission rod (311). Several adjustable stirring rods (312) are connected to the outside of the transmission rod (311). The ends of the outer surfaces of the adjustable stirring rods (312) and the fixed stirring rods (313) away from the transmission rod (311) extend to the inner wall of the reaction tank (5).

4. The novel septic tank for special-purpose vehicles according to claim 3, characterized in that: The upper end of the transmission rod (311) extends above the protective cover (2) and is fixedly connected to a transmission wheel (314). The transmission wheel (314) is driven and sleeved in the transmission belt at the output end of the drive motor. The upper end of the transmission rod (311) is rotatably sleeved inside the protective cover (2) via a shaft. The adjustment locking assembly (32) is installed on the top of the transmission wheel (314) and sleeved on the outer surface of the connecting pipe (42).

5. A novel septic tank for special-purpose vehicles according to claim 3, characterized in that: The outer surface of the transmission rod (311) is provided with a plurality of evenly distributed sliding grooves (315). A plurality of sliders (316) are slidably engaged inside the sliding grooves (315). A plurality of connecting sleeves (317) are movably sleeved on the outside of the transmission rod (311). One end of the adjustable stirring rod (312) near the transmission rod (311) is fixedly connected to the outer surface of the connecting sleeve (317). A plurality of linkage sleeves (318) are sleeved between the transmission rod (311) and the connecting pipe (42). The sliders (316) are fixedly connected between the connecting sleeves (317) and the linkage sleeves (318).

6. A novel septic tank for special-purpose vehicles according to claim 5, characterized in that: The inner wall of the linkage sleeve (318) and the outer surface of the connecting pipe (42) are both provided with threads (319), and the linkage sleeve (318) and the connecting pipe (42) are connected to each other by the threads (319).

7. A novel flocculation reaction tank for sewage in a special-purpose vehicle according to claim 4, characterized in that: The adjustment locking assembly (32) includes an adjustment knob (321) sleeved on the outside of the connecting tube (42). A positioning spring (323) is connected to the top of the adjustment knob (321). Two locking rings (322) are provided between the bottom of the adjustment knob (321) and the top of the transmission wheel (314). The opposing surfaces of the two locking rings (322) are inserted into each other. The opposing back surfaces of the two locking rings (322) are respectively fixedly connected to the transmission wheel (314) and the adjustment knob (321). The outer surface of the connecting tube (42) is provided with a plurality of limiting slots (324) located inside the adjusting knob (321) and evenly distributed. The limiting slots (324) are slidably engaged with limiting blocks (325). One end of the limiting block (325) extends to the outside of the limiting slots (324) and is fixedly connected to the inside of the adjusting knob (321).

8. A novel septic tank for special-purpose vehicles according to claim 7, characterized in that: A flow guide (47) is connected between the feed pipe (41) and the connecting pipe (42). The flow guide (47) has a cone-shaped structure. The upper end of the flow guide (47) is connected to the bottom of the feed pipe (41), and the lower end of the flow guide (47) is connected to the connecting pipe (42). The flow guide (47) is fixedly connected to the bottom of the feed pipe (41). A shaft sealing ring (48) that abuts against the upper end of the positioning spring (323) is connected between the flow guide (47) and the connecting pipe (42). The flow guide (47) and the connecting pipe (42) are sealed together by the shaft sealing ring (48).

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