Detachable filler fixing device of sewage biochemical treatment reactor

By employing a detachable packing fixing device in the wastewater biochemical treatment reactor, utilizing bottom limiting protrusions and a synchronous locking mechanism, the problems of complex packing installation and high maintenance costs in existing technologies are solved, achieving rapid installation and reliable clamping, and improving construction efficiency and maintenance convenience.

CN121573804APending Publication Date: 2026-02-27CHENGDU UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202511951482.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-23
Publication Date
2026-02-27

AI Technical Summary

Technical Problem

In existing wastewater biochemical treatment reactors, the installation and maintenance of packing materials rely heavily on welding, which leads to complex construction, difficulty in ensuring welding quality, and difficulty in balancing overall installation efficiency and reliability. Subsequent maintenance and replacement costs are high, and the additional pressing components increase assembly steps and leveling difficulties.

Method used

The device employs a detachable packing fixing device, which uses a bottom limiting protrusion to position the packing plate, a clamping structure that engages with the outer cylinder and the inner shaft, and a synchronous locking mechanism to achieve layered pre-clamping and final locking of the packing. This reduces reliance on welding, simplifies the installation process, and improves the convenience of disassembly and maintenance.

Benefits of technology

It enables rapid installation and reliable clamping of the packing material, simplifies the construction process, reduces the difficulty of transportation and secondary fixing, improves installation efficiency and maintenance convenience, and ensures the stability and reliability of the structure.

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Abstract

The invention relates to the technical field of sewage treatment, and particularly discloses a detachable filler fixing device for a sewage biochemical treatment reactor. The plurality of bottom supporting mechanisms are arranged at the bottom in the treatment tank; the plurality of filler plates are laid above the bottom supporting mechanism in an inclined state; the limiting and clamping mechanism is arranged at the top end of the filler plate and comprises an outer cylinder and an inner shaft body which is arranged in the outer cylinder and can rotate; the synchronous locking mechanisms are arranged on the outer sides of the two ends of the treatment tank in the axial direction of the outer cylinder; the synchronous locking mechanism comprises an edge frame, a synchronous adjusting lead screw arranged at the bottom of the edge frame, a sliding seat in threaded connection with the synchronous adjusting lead screw, and a locking block connected with the sliding seat through a transmission structure. And the locking block is operably connected with the end part of the limiting clamping mechanism. According to the fixing device, the filler can be rapidly installed and reliably clamped without depending on a large amount of welding, and the fixing device is convenient to disassemble, assemble and maintain.
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Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a detachable packing fixing device for a wastewater biochemical treatment reactor. Background Technology

[0002] When installing honeycomb inclined tubes or honeycomb packing plates in wastewater biological treatment reactors (such as sedimentation tanks and biological treatment tanks), the engineering practice is usually to form an integral packing block by welding or binding adjacent packing plates point by point. This method is highly dependent on on-site construction conditions, with a large number of welding points, high requirements for positioning angles, and cumbersome operation procedures. Moreover, it is difficult to ensure welding quality and consistency in tank space and wet operation environments. On the other hand, the integral packing block formed after welding is large in volume, difficult to transport and reposition, and subsequent maintenance and replacement often require the removal of large sections of the structure, resulting in high maintenance costs. In addition, in order to suppress the floating, loosening or displacement of the packing under operating conditions, existing solutions often add additional pressing components such as pressure strips and pressure pipes on the top of the packing, which increases the number of components, adds assembly steps, and increases the number of on-site leveling and fastening points. It is still difficult to balance the overall installation efficiency and reliability. Therefore, there is an urgent need for a fixing device that can achieve rapid installation, reliable clamping and easy disassembly and maintenance of the packing without relying on a large amount of welding. Summary of the Invention

[0003] This application provides a detachable packing fixing device for a wastewater biochemical treatment reactor. The main purpose is to achieve a fixing device that enables rapid installation, reliable clamping, and easy disassembly and maintenance of the packing without relying on extensive welding.

[0004] To achieve the above objectives, embodiments of this application provide a detachable packing fixing device for a wastewater biochemical treatment reactor, comprising: Treatment pool; Multiple bottom support mechanisms are provided at the bottom of the processing pool; Multiple packing plates are laid at an angle above the bottom support mechanism; A limiting clamping mechanism is provided at the top of the packing plate. The limiting clamping mechanism includes an outer cylinder and an internal shaft that is disposed inside the outer cylinder and is rotatable. A synchronous locking mechanism is disposed on the outer sides of both ends of the treatment tank along the axial direction of the outer cylinder; the synchronous locking mechanism includes a side frame, a synchronous adjusting screw disposed at the bottom of the side frame, a sliding seat screwed to the synchronous adjusting screw, and a locking block connected to the sliding seat through a transmission structure; the locking block is operably connected to the end of the limiting clamping mechanism.

[0005] In one feasible implementation, the bottom end of the outer cylinder is provided with an inclined fixed clamping plate, and a movable groove is provided above the fixed clamping plate; multiple movable clamping plates are provided along the axial direction on the inner shaft; the end of the inner shaft extends to the outside of the treatment pool and is connected to an operating wrench.

[0006] In one feasible implementation, a fixing locking strip is provided at the end of the outer cylinder; an end rotating block is provided at the end of the inner shaft, and a rotating locking strip is provided on the end rotating block; a locking groove is provided on the locking block, and the locking groove can be sleeved on the outside of the fixing locking strip and the rotating locking strip.

[0007] In one feasible implementation, the inner sidewall of the side frame is provided with a limiting seat, the limiting seat is provided with a limiting groove, and the locking block is movably disposed in the limiting groove.

[0008] In one feasible implementation, the transmission structure is an inclined connecting rod, the two ends of which are rotatably connected to the sliding seat and the locking block, respectively.

[0009] In one feasible implementation, the bottom opening of the locking groove is an outwardly flared shape.

[0010] In one feasible implementation, the top end face of the bottom support mechanism is provided with a bottom limiting protrusion for positioning the bottom of the filler plate.

[0011] This application provides a detachable packing fixing device for a wastewater biochemical treatment reactor. Compared with existing fixing methods that rely on point-by-point welding and additional pressing components, this technology uses a bottom limiting protrusion to position the bottom of the packing plate, and uses a fixed clamping plate and a movable clamping plate that cooperate with the outer cylinder and the inner shaft to clamp and shape the top of the packing. Furthermore, it utilizes a synchronous locking mechanism located on the outer sides of both ends of the tank to uniformly lock the fixed locking strip and the rotating locking strip, thus forming a structured fixing system with layered pre-clamping and synchronous final locking of the assembly. This system can significantly reduce the reliance on welding processes, allowing the packing to be assembled in layers and positioned and clamped during the assembly process. After installation, multiple clamping positions are simultaneously tightened. The structure is stable and easier to disassemble and maintain. It is suitable for rapid on-site installation and subsequent maintenance and replacement needs. Attached Figure Description

[0012] Figure 1 A schematic diagram of the detachable packing fixing device for a wastewater biochemical treatment reactor provided in an embodiment of this application is shown. Figure 2 Figure 1 A magnified schematic diagram of the structure at point A in the diagram; Figure 3This illustration shows a side sectional view of the detachable packing fixing device for a wastewater biochemical treatment reactor provided in an embodiment of this application. Figure 4 This illustration shows a schematic diagram of the positions of all the outer cylinders and internal shafts provided in the embodiments of this application; Figure 5 This paper shows a partial top view of the detachable packing fixing device for a wastewater biochemical treatment reactor provided in an embodiment of this application. Figure 6 It shows Figure 4 A magnified schematic diagram of the structure at point B in the diagram; Figure 7 This illustration shows a structural diagram of the fixed clamping plate and the movable clamping plate in a clamping state according to an embodiment of this application; Figure 8 A schematic diagram of the internal shaft structure provided in an embodiment of this application is shown; Figure 9 A schematic diagram of the structure of the operating wrench provided in an embodiment of this application is shown; Figure 10 This illustration shows a schematic diagram of the structure of the movable clamping plate in the raised state according to an embodiment of this application; Figure 11 A schematic diagram of the locking groove provided in an embodiment of this application is shown.

[0013] In the diagram: 10. Treatment tank; 20. Packing plate; 30. Limiting clamping mechanism; 40. Synchronous locking mechanism; 50. Operating mechanism; 60. Bottom support mechanism; 31. Outer cylinder; 32. Internal shaft; 311. Fixed clamping plate; 312. Movable groove; 313. Fixed locking bar; 321. Movable clamping plate; 322. End rotating block; 323. Rotating locking bar; 324. Sealing sheet; 325. Operating wrench; 41. Side frame; 42. Limiting seat; 43. Synchronous adjusting screw; 44. Sliding seat; 45. Inclined connecting rod; 46. Locking block; 421. Limiting slide groove; 461. Locking groove; 61. Bottom limiting protrusion. Detailed Implementation

[0014] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0015] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying 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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0016] Please see Figures 1 to 11 As shown in the figure, this application provides a detachable packing fixing device for a wastewater biochemical treatment reactor, including: a treatment tank 10, multiple packing plates 20, a limiting clamping mechanism 30, a synchronous locking mechanism 40, and multiple bottom support mechanisms 60. Specifically, multiple bottom support mechanisms 60 are disposed at the bottom of the treatment tank 10; multiple packing plates 20 are laid at an incline above the bottom support mechanisms 60; a limiting clamping mechanism 30 is disposed at the top of the packing plate 20, and the limiting clamping mechanism 30 includes an outer cylinder 31 and an internal shaft 32 disposed within the outer cylinder 31 and rotatable; a synchronous locking mechanism 40 is disposed on the outer sides of both ends of the treatment tank 10 along the axial direction of the outer cylinder 31; the synchronous locking mechanism 40 includes a side frame 41, a synchronous adjusting screw 43 disposed at the bottom of the side frame 41, a sliding seat 44 screwed to the synchronous adjusting screw 43, and a locking block 46 connected to the sliding seat 44 through a transmission structure; the locking block 46 is operably connected to the end of the limiting clamping mechanism 30.

[0017] This application avoids traditional welding methods through a detachable design, simplifies the installation process, reduces workload, and solves the problems of transportation and secondary fixing. Specifically, the treatment tank 10 provides an environment for the biochemical treatment of sewage; multiple bottom support mechanisms 60 are set at the bottom of the treatment tank 10 to support the packing plates 20, ensuring that they are laid in an inclined state to form a honeycomb structure, thus avoiding the need for welding; multiple packing plates 20 are laid on top of the support mechanisms to form the treatment core; the limiting clamping mechanism 30 is set at the top of the packing plate 20, including an outer cylinder 31 and a rotatable internal shaft 32. According to the rotation of the internal shaft 32, the top of the packing plate 20 is clamped to prevent it from floating under the buoyancy of the water flow; the synchronous locking mechanism 40 is set on the outer side of both ends of the treatment tank 10, including a side frame 41, a synchronous adjusting screw 43, a sliding seat 44, a transmission structure and a locking block 46. According to the rotation of the synchronous adjusting screw 43, the sliding seat 44 is moved, and then the locking block 46 is driven to move through the transmission structure. The locking block 46 is connected to the end of the limiting clamping mechanism 30 to realize the synchronous locking of multiple limiting clamping mechanisms 30, thereby completing the fixation at one time and reducing the workload of point-by-point operation.

[0018] In some examples, the outer cylinder 31 is further provided with an inclined fixed clamping plate 311 at the bottom, and a movable groove 312 is provided above the fixed clamping plate 311; multiple movable clamping plates 321 are provided on the inner shaft 32 along the axial direction; the end of the inner shaft 32 extends to the outside of the treatment pool 10 and is connected to an operating wrench 325.

[0019] In this example, by refining the specific structure of the limiting clamping mechanism 30, the problem of imperfect clamping mechanism is effectively solved. Specifically, the inclined fixed clamping plate 311 set at the bottom of the outer cylinder 31 adapts to the inclined installation angle of the packing plate 20, providing a stable fixed clamping point and ensuring the reliability of the clamping foundation; the movable groove 312 opened above the fixed clamping plate 311 provides space for the rotation of the movable clamping plate 321, allowing it to move smoothly to achieve the clamping action; the multiple movable clamping plates 321 set along the axial direction on the internal shaft 32 rotate in unison through the shaft, realizing the synchronous control of multiple clamping points and improving installation efficiency; the operating wrench 325 extending from the end of the internal shaft 32 to the outside of the treatment pool 10 and connected to it facilitates manual operation, simplifies the clamping and unlocking process, and enhances the practicality and ease of operation of the device.

[0020] In some examples, the outer cylinder 31 is further provided with a fixed locking strip 313 at its end; the inner shaft 32 is provided with an end rotating block 322 at its end, and a rotating locking strip 323 is provided on the end rotating block 322; a locking groove 461 is provided on the locking block 46, and the locking groove 461 can be sleeved on the outside of the fixed locking strip 313 and the rotating locking strip 323.

[0021] In this example, by setting a fixed locking strip 313 at the end of the outer cylinder 31, setting an end rotating block 322 with a rotating locking strip 323 at the end of the inner shaft 32, and opening a locking groove 461 on the locking block 46, a unified and reliable locking of the limiting clamping mechanism 30 is achieved, thereby solving the problem of insufficient pre-locking. Specifically, a fixed locking strip 313 is provided at the end of the outer cylinder 31 to provide a fixed locking reference point, ensuring that the outer cylinder 31 is stable outside the treatment pool 10 and preventing displacement during subsequent operations; an end rotating block 322 is provided at the end of the inner shaft 32, and a rotating locking strip 323 is provided on the rotating block, allowing the inner shaft 32 to drive the rotating locking strip 323 to move when rotating; a locking groove 461 is provided on the locking block 46 to fit on the outside of the fixed locking strip 313 and the rotating locking strip 323. When the locking groove 461 moves, it forcibly locks the two together, ensuring that the movable clamping plate 321 and the fixed clamping plate 311 are tightly fitted. Thus, under the operation of the synchronous locking mechanism 40, the final fixing can be completed without manual intervention, improving installation efficiency and locking reliability.

[0022] In some examples, the inner wall of the side frame 41 is provided with a limiting seat 42, and the limiting seat 42 is provided with a limiting groove 421, and the locking block 46 is movably disposed in the limiting groove 421.

[0023] In this example, the problem of unstable movement of the locking block 46 is solved by introducing a limiting seat 42 and a limiting groove 421. Specifically, a limiting seat 42 is provided on the inner wall of the side frame 41. The limiting seat 42 is fixed to the frame to provide a stable support base and prevent loosening. A limiting groove 421 is provided on the limiting seat 42. The limiting groove 421 serves as a guide channel to constrain the movement trajectory of the locking block 46 and prevent it from deviating or shaking. The locking block 46 is movably disposed within the limiting groove 421. When the locking block 46 slides within the groove, its path is controlled, allowing it to accurately align with the target position and achieve efficient locking. Overall, the setup in this example enhances the stability of the synchronous locking mechanism 40 and improves the detachability and operational efficiency of the packing fixing device.

[0024] In some examples, the transmission structure is further defined as an inclined connecting rod 45, the two ends of which are rotatably connected to the sliding seat 44 and the locking block 46, respectively.

[0025] In this example, by using an inclined connecting rod 45 as the transmission structure, with its two ends rotatably connected to the sliding seat 44 and the locking block 46 respectively, the problem of transmission instability is effectively solved. Specifically, the linear motion of the sliding seat 44 allowed by the inclined connecting rod 45 is efficiently transmitted to the locking block 46 through the rotatable connection, ensuring that the locking block 46 moves smoothly within the limiting groove 421, thereby achieving precise operation of the synchronous locking mechanism 40; at the same time, the rotatable connection reduces friction and jamming during the movement process, improving the overall operating efficiency and reliability of the device.

[0026] In some examples, the bottom opening of the locking groove 461 is further flared outwards. This solves the problem of misalignment when fitting the fixed locking strip 313 and the movable locking strip, allowing for locking even with slight errors, thus improving installation convenience.

[0027] Specifically, the bottom opening of the locking groove 461 is outwardly flared, meaning that the opening has a gradually expanding structure. This allows the fixed locking bar 313 and the rotating locking bar 323 to slide more smoothly into the locking groove 461 during the movement of the locking block 46, reducing the reliance on precise alignment, avoiding jamming or misalignment during operation, and improving the operating efficiency of the synchronous locking mechanism 40.

[0028] In some examples, the bottom support mechanism 60 is further provided with a bottom limiting protrusion 61 for positioning the bottom of the filler plate 20.

[0029] In this example, by setting a bottom limiting protrusion 61 on the top end face of the bottom support mechanism 60, the problem of the lack of a bottom fixing mechanism during the installation of the filler plate 20 is solved. Specifically, the bottom support mechanism 60 serves as a support base, and its top end face is provided with a bottom limiting protrusion 61, which is used to directly position the bottom of the filler plate 20 during installation, ensuring that the initial position of the filler plate 20 is fixed and avoiding sliding or displacement. This facilitates subsequent tilting and alignment to form a honeycomb shape, improves the ease of installation and the accuracy of the installation effect, and also enhances the fixing effect and structural strength during use.

[0030] In this example, by setting a bottom limiting protrusion on the top end face of the bottom support mechanism, the problem of the lack of a bottom fixing mechanism during the installation of the filler plate is solved. Specifically, the bottom support mechanism, as a supporting foundation, has a bottom limiting protrusion on its top end face to directly position the bottom of the filler plate during installation, ensuring that the initial position of the filler plate is fixed and preventing slippage or displacement. This facilitates subsequent tilting and alignment to form a honeycomb shape, improves the ease of installation and the accuracy of the installation effect, and also enhances the fixing effect and structural strength during use.

[0031] In some examples, the sealing sheet 324 is disposed on both sides of the movable groove 312 of the outer cylinder 31 along the axial direction of the inner shaft 32. The sealing sheet 324 forms a close fit with the inner wall of the outer cylinder 31 and the outer periphery of the inner shaft 32, and is used to seal and isolate the internal space of the outer cylinder 31. During the process of the inner shaft 32 rotating and driving the movable clamping plate 321 to enter and exit the movable groove 312, the sealing sheet 324 always maintains a blocking state on the opening area of ​​the movable groove 312, thereby effectively preventing sewage and impurities in the treatment tank 10 from entering the interior of the outer cylinder 31, avoiding affecting the smooth rotation and structural reliability of the inner shaft 32, and achieving necessary waterproof and anti-fouling isolation without restricting the rotation of the inner shaft 32.

[0032] In some examples, the operating mechanism 50 is located outside the treatment tank 10 and is connected to the synchronous adjusting screw 43 of the synchronous locking mechanism 40. The operating mechanism 50 is used to drive the synchronous adjusting screw 43 to rotate, thereby causing multiple sliding seats 44 screwed to the synchronous adjusting screw 43 to move synchronously in a straight line. During the movement of the sliding seats 44, the motion is transmitted to the locking block 46 through the inclined connecting rod 45, so that the locking block 46 moves along the limiting slide groove 421 in the side frame 41 and uniformly fits and presses the locking strip, thereby realizing the synchronous locking operation of multiple limiting clamping mechanisms 30. The operating mechanism 50 can be set outside the tank in a manual or other mechanical drive form, so as to complete the overall locking and adjustment without entering the treatment tank 10.

[0033] The working principle of this device is as follows: First, a bottom support mechanism 60 is arranged inside the treatment tank 10, causing the bottom ends of the packing plates 20 to fall sequentially into the bottom limiting protrusions 61 for initial positioning. The packing plates 20 are arranged layer by layer at a predetermined inclination angle to form a honeycomb structure. During the installation of the packing plates 20, the operating wrench 325 located on the outside of the treatment tank 10 is rotated, causing the internal shaft 32 to rotate. This causes multiple movable clamping plates 321 on the shaft to simultaneously rotate into the movable grooves 312 of the outer cylinder 31, cooperating with the fixed clamping plates 311 at the bottom of the outer cylinder 31 to clamp the top ends of adjacent packing plates 20. This achieves pre-positioning of the packing plates 20 during the layered installation stage. After all the packing plates 20 are installed, the synchronous adjusting screws 43 located on the outer sides of both ends of the treatment tank 10 are driven to cause the sliding seats 44 connected to them to move synchronously in a straight line. The sliding seats 44 drive the locking blocks 46 to move along the limiting slide grooves 421 in the side frame 41 via the inclined connecting rods 45. The locking grooves 461 on the locking blocks 46 fit and press the fixed locking strips 313 and the rotating locking strips 323, so that the end rotating blocks 322 and the internal shafts 32 are uniformly locked and constrained. Finally, the movable clamping plate 321 and the fixed clamping plate 311 form a stable clamp on the top of the packing plates 20, realizing the synchronous locking and reliable fixation of multiple sets of packing plates 20.

[0034] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A detachable filler fixing device for a sewage biochemical treatment reactor, characterized in that, The sewage biochemical treatment reactor detachable filler fixing device comprises a treatment pool (10), a plurality of bottom support mechanisms (60) arranged on the bottom of the treatment pool (10), a plurality of filler plates (20) arranged above the bottom support mechanisms (60) in an inclined state, a limiting and clamping mechanism (30) arranged at the top end of the filler plates (20), the limiting and clamping mechanism (30) comprising an outer cylinder (31) and an inner shaft body (32) arranged in the outer cylinder (31) and rotatable, a synchronous locking mechanism (40) arranged outside the two ends of the treatment pool (10) along the axial direction of the outer cylinder (31), the synchronous locking mechanism (40) comprising a side frame (41), a synchronous adjusting screw rod (43) arranged at the bottom of the side frame (41), a sliding seat (44) screwed to the synchronous adjusting screw rod (43), and a locking block (46) connected to the sliding seat (44) through a transmission structure, and the locking block (46) is operatively connected to the end of the limiting and clamping mechanism (30).

2. The sewage biochemical treatment reactor detachable filler fixing device according to claim 1, wherein the bottom end of the outer cylinder (31) is provided with an inclined fixed clamping plate (311), an active slot (312) is formed above the fixed clamping plate (311), a plurality of active clamping plates (321) are arranged on the inner shaft body (32) along the axial direction, and the end of the inner shaft body (32) extends to the outside of the treatment pool (10) and is connected with an operating wrench (325).

3. The sewage biochemical treatment reactor detachable filler fixing device according to claim 2, wherein the end of the outer cylinder (31) is provided with a fixed locking strip (313), the end of the inner shaft body (32) is provided with an end rotating block (322), the end rotating block (322) is provided with a rotating locking strip (323), and a locking slot (461) is formed in the locking block (46), the locking slot (461) can be sleeved outside the fixed locking strip (313) and the rotating locking strip (323).

4. The sewage biochemical treatment reactor detachable filler fixing device according to claim 1 or 3, wherein the inner side wall of the side frame (41) is provided with a limiting seat (42), the limiting seat (42) is provided with a limiting sliding groove (421), and the locking block (46) is movably arranged in the limiting sliding groove (421).

5. The sewage biochemical treatment reactor detachable filler fixing device according to claim 4, wherein the transmission structure is an inclined connecting rod (45), and the two ends of the inclined connecting rod (45) are rotatably connected with the sliding seat (44) and the locking block (46) respectively.

6. The sewage biochemical treatment reactor detachable filler fixing device according to claim 3, wherein the bottom end opening of the locking slot (461) is in an outwardly expanding shape.

7. The sewage biochemical treatment reactor detachable filler fixing device according to claim 1 or 2, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The top end face of the bottom supporting mechanism (60) is provided with a bottom limiting protrusion (61) for positioning the bottom of the filler plate (20).