CN221168089U

CN221168089U - Prefabricated drainage well cleaning mechanism

Info

Publication number: CN221168089U
Application number: CN202323222206.2U
Authority: CN
Inventors: 孙逊; 陈尚坤; 王斌; 曹靖翎; 孙学明; 蓝伟俊; 刘磊; 万延泰
Original assignee: Qingdao New Century Prefabricate Co ltd
Current assignee: Qingdao New Century Prefabricate Co ltd
Priority date: 2023-11-28
Filing date: 2023-11-28
Publication date: 2024-06-18
Anticipated expiration: 2033-11-28

Abstract

The utility model discloses a prefabricated drainage well cleaning mechanism, which relates to the technical field of prefabricated members and adopts the technical scheme that the prefabricated drainage well cleaning mechanism comprises a filtering assembly capable of being arranged in a drainage well, wherein the filtering assembly comprises a filtering barrel group and a plurality of filtering barrels which are detachably arranged; the circumference of the filter vat is distributed in an array manner; the whole filter vat set can rotate axially: the driving mechanism comprises a motor which is used as a power source of the driving mechanism; the main shaft is linked with a motor shaft of the motor and is driven to rotate by the motor; the main shaft can be linked with the filter vat set. The utility model has the beneficial effects that the filter vat of the scheme is of a barrel group structure consisting of a plurality of filter vats, a single filter vat is used as a main sundry filtering and collecting structure, when the sundries in the barrel are overweight, the filter vat can be rotated to the preset outlet, and in the rotating process, other filter vats can continuously receive sewage and filter the sewage, so that the work of a drainage well is not influenced.

Description

Prefabricated drainage well cleaning mechanism

Technical Field

The utility model relates to the technical field of prefabricated parts, in particular to a prefabricated drainage well cleaning mechanism.

Background

At present, prefabricated drainage well cleaning mechanism mainly divides into prefabricated assembled reinforced concrete drainage inspection shaft and plastics drainage inspection shaft two types, and the former is applicable to occasions that bear great load such as municipal road pavement, and the latter is applicable to occasions that bear less load such as greenbelt, interior street and building district, and prefabricated drainage well cleaning mechanism's model specification is complete, can select and make up according to different drainage demands. And the drainage well is manufactured in a prefabricated mode, so that the construction time of the corresponding position of the drainage well can be greatly shortened, and manpower and material resources are saved.

In the relevant prior art of prefabricated inspection shaft, in order to prevent impurity gathering in the sewage and cause the jam to the drain pipe in the drainage shaft, for example, prior art bulletin number is CN 215211434U's literature provides a drainage inspection shaft prefabrication, the device is through vertical the being provided with the polylith filter in proper order in the inspection shaft, improve the filter effect of inspection shaft, avoid impurity to block up the outlet, the filter passes through the rings at roof top, the sliding connection of rethread slider and spout, conveniently pull out the filter, clear up the impurity of adhesion on the filter, also clear up the accumulational impurity on the bottom plate, the convenience is used once more, the protective sheath of inspection shaft outside setting plays the guard action to the inspection shaft.

The above-mentioned prior art scheme is through setting up a plurality of filter realization to the filtration of impurity in the well to can take out the filter and clear up in order to maintain the result of use of filter, but in the continuous drainage in-process of well, if the filter need take out to clear up, can briefly lose the filter effect after the filter takes out, and can't in time clear up or change according to the edulcoration condition of filter, therefore there is this defect that can't change filter unit according to the filtration volume to impurity automatically.

In view of this, we propose a prefabricated drainage well cleaning mechanism.

Disclosure of utility model

Aiming at one of the defects in the prior art, the utility model provides a prefabricated drainage well cleaning mechanism, which solves the problem that a filtering component cannot be automatically replaced according to the filtering quantity of impurities.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a prefabricated drainage well cleaning mechanism, including can setting up the inside filter equipment of drainage well, filter equipment includes:

The filter vat set comprises a plurality of filter vats which are detachably arranged; the circumference of the filter vat is distributed in an array manner; the wall of the filter barrel is provided with filter holes; the whole filter vat set is rotatable:

a drive mechanism, the drive mechanism comprising:

a motor as a power source of the driving mechanism;

The main shaft is linked with a motor shaft of the motor and is driven to rotate by the motor; the main shaft can be linked with the filter vat set.

Preferably, the filter assembly further comprises:

The main support is provided with a plurality of mounting positions corresponding to the filter barrels; the middle part of the main support is fixedly connected with a main shaft sleeve, the main shaft sleeve is sleeved with the main shaft, and the main support can be linked with the main shaft through the main shaft sleeve;

When the impurity weight in the filter vat exceeds a preset value, the main support is driven by the main shaft through the main shaft sleeve to rotate by an angle value, and the angle value meets the following requirements:

α＝360°/n

wherein alpha is the angle of each rotation of the main shaft sleeve, and n is the number of filter barrels in the filter barrel group.

Preferably, the main support further comprises:

An outer supporting plate, a plate body of which is provided with a drainage groove;

The baffle is fixedly arranged on the upper side of the outer supporting plate, the number of the baffle corresponds to that of the filter barrels, and the baffle is positioned between two adjacent filter barrels.

Preferably, a positioning structure with a clamping groove and a clamping block matched with each other is arranged between the outer supporting plate and the filter barrel;

and a drainage groove is formed in the partition plate.

Preferably, the main support further comprises:

the upper frame is an annular frame fixedly arranged at the upper end of the main shaft sleeve.

Preferably, the filter assembly further comprises:

The linkage assembly, the filter vat pass through the linkage assembly with the main shaft linkage, the linkage assembly includes:

The inner supporting plate is arranged corresponding to each filter vat and is positioned at the inner side of the lower part of the filter vat; the inner supporting plate can be lifted or lowered in the vertical direction, a filtering hole is formed in the plate body of the inner supporting plate, and when the inner supporting plate moves downwards, the linkage of the main shaft and the main shaft sleeve can be triggered;

And the reset mechanism is connected with the inner supporting plate and can reset the inner supporting plate.

Preferably, the linkage assembly further comprises:

The first linkage piece is fixedly connected with the inner supporting plate and extends to the lower part of the inner supporting plate, and the inner supporting plate can drive the first linkage piece to trigger the linkage of the main shaft and the main shaft sleeve through displacement.

Preferably, the linkage assembly further comprises:

the second linkage piece is a block arranged in the main shaft sleeve, one is arranged corresponding to each filter barrel, and the second linkage piece can transversely move in the horizontal direction; a second clamping part is arranged on one side of the second linkage piece, which faces the main shaft;

The spindle includes:

The first clamping part is arranged on the shaft body of the main shaft and corresponds to the second clamping part, when the inner supporting plate moves downwards, the first linkage piece can drive the second linkage piece to move transversely, and the first clamping part and the second clamping part are clamped.

Preferably, the reset mechanism includes:

the first reset component can reset the inner supporting plate in the vertical direction;

and the second reset assembly can reset the second linkage member.

Preferably, a spherical block is arranged below the inner supporting plate, and the reset mechanism further comprises:

the upper surface of the reset base table is an annular structural surface corresponding to the moving path of the spherical block, and comprises a high horizontal surface and a low horizontal surface, and an inclined transition surface is arranged between the high horizontal surface and the low horizontal surface;

In the initial state, the spherical block below the filter vat close to the water inlet of the drainage well is positioned above the low horizontal plane of the reset base table, and a space is reserved between the spherical block and the low horizontal plane.

Compared with the prior art, the method has the following beneficial effects: according to the application, the plurality of filter barrels are arranged as a cleaning mechanism for impurities in sewage, so that the impurities in the sewage discharged subsequently can be blocked, and the problem of blockage of subsequent pipelines is reduced. The filter vat of this scheme is the barrel group structure of a plurality of constitutions to single filter vat is as main debris filtration collection structure, and when debris in this bucket was overweight, can be rotatory to the export of predetermineeing, in rotatory in-process, other filter vats can continue to accept sewage and filter, does not influence the work of drainage well.

The device is of a cylindrical structure, can be applied to the inside of the existing drainage well, and can be easily combined with the structure of the existing drainage well.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic view of a main support structure according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a filter vat according to an embodiment of the present application;

FIG. 4 is an enlarged view of part B of FIG. 3;

fig. 5 is a schematic structural diagram of a linkage assembly according to an embodiment of the present application.

In the figure:

3. A filter assembly; 31. a filter vat; 311. a handle; 32. a main support; 321. a spindle sleeve; 322. a supporting plate; 323. a partition plate; 324. an upper frame; 33. a linkage assembly; 331. an inner pallet; 332. a first linkage member; 3321. a vertical rod; 3322. a cross bar; 333. a second linkage member; 34. a reset mechanism; 341. a first reset assembly; 3411. resetting the bracket; 3412. a first return spring; 342. a second reset assembly; 343. resetting the base table;

41. a motor; 42. a main shaft; 421. a first clamping part; 422. a through hole; 43. a motor cover.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-3, the present application provides the following technical solutions:

A prefabricated drainage well cleaning mechanism comprises a filtering component (3) which can be arranged in a drainage well, and large-volume impurities in sewage are filtered through the filtering component 3. The filter assembly 3 comprises a filter vat set, and a plurality of filter vats 31 which are detachably arranged are arranged in consideration of the fact that the work of a drainage well is not influenced when the filter vat 31 is replaced, and the number of the filter vats 31 is at least two. The filter barrels 31 are distributed in a circumferential array; the wall of the filter drum 31 is provided with filter holes; the filter vat set is rotatable as a whole.

Through the structure of this scheme, when the inside debris of filter vat 31 is too much and need clear away debris in the filter vat 31, only need rotate whole filter vat group, make the filter vat 31 that needs the clearance remove to the filter vat change position that corresponds, then take out the clearance with filter vat 31 can. The rest of the filter barrels 31 are still in a working state at this time, so that the working of the whole drainage well is not affected.

On the basis of the embodiment, the cleaning mechanism is provided with a driving mechanism, the driving mechanism comprises a motor 41, and the motor 41 is arranged at the bottom of the drainage well through the motor seat mechanism and is used as a power source of the driving mechanism; a main shaft 42 is provided in conjunction with the motor shaft of the motor 41, and the filter tub group rotates around the main shaft 42.

In this embodiment, since the load applied to the motor 41 is not too high, the existing gear motor can be directly used as the motor 41 without providing any other gear mechanism. The output shaft of the motor 41 may be coaxial with the main shaft 42. For protecting the motor 41, a motor cover 43 may be attached to the upper side of the motor 41, as shown in fig. 1, the motor cover 43 is fastened to the motor 41, a tapered surface is provided on the outer side of the lower portion of the motor cover 43, and sewage from the top down can be isolated on the outer side of the motor 41.

On the basis of the embodiment, the filter assembly 3 further comprises a main bracket 32, and a plurality of mounting positions are arranged on the main bracket 32 corresponding to the filter drum 31; the middle part of the main support 32 is fixedly connected with a main shaft sleeve 321, the main shaft sleeve 321 is sleeved with a main shaft 42, and the main support 32 can be linked with the main shaft 42 through the main shaft sleeve 321; when the impurity weight in the filter vat 31 exceeds the preset value, the main shaft 42 can drive the main support 32 to rotate by an angle value through the main shaft sleeve 321, and the angle value satisfies:

α＝360°/n

Where α is the angle of each rotation of the spindle cover 321, and n is the number of filter barrels 31 in the filter barrel set. Taking this scheme as an example, 4 filter barrels are provided, and the angle of each rotation is 90 °.

For the linkage form of the filter vat 31 and the main shaft 42, the existing electric control technology can be used, for example, a pressure sensor, a distance sensor or the like is arranged in the filter vat 31, the weight of sundries in the filter vat 31 is sensed, or the weight of the sundries pile and the lower side face of the well lid 2 are excessively sensed to obtain a sensing trigger signal, and then the rotation of the main support 32 is triggered, so that the filter vat 31 needing to be cleaned is transferred to the filter vat cleaning position to wait for cleaning, and meanwhile, the cleaning signal can be fed back to the upper computer system when the sensing signal is triggered, so that related staff is prompted.

On the basis of the above embodiments. The main support 32 comprises an outer supporting plate 322, a drainage groove is formed in the outer supporting plate 322, and a clamping groove and a clamping block matched positioning structure are arranged between the outer supporting plate 322 and the filter drum 31. A plurality of partition plates 323 are arranged on the supporting plate corresponding to the filter barrels 31, the partition plates 323 are positioned between two adjacent filter barrels 31, and water drainage grooves are also formed in the partition plates 323.

The main bracket 32 further includes an upper frame 324 fixedly provided at an upper end of the main shaft cover 321, the upper frame being ring-shaped and rotatably coupled to a lower portion of the coupling member 14 through a bearing.

This partial structure is mainly intended to improve the overall stability of the main support 32, making it more robust and durable.

On the basis of the above embodiments. The filter assembly 3 further includes a linkage assembly 33, and the filter basket 31 is linked with the main shaft 42 through the linkage assembly 33.

The linkage assembly 33 includes an inner plate 331 and a reset structure 34. The inner supporting plate 331 is disposed corresponding to each filter vat 31 and is positioned at the inner side of the lower portion of the filter vat 31; the inner supporting plate 331 can be lifted or lowered in the vertical direction, and a filtering hole is formed in the plate body of the inner supporting plate 331, so that when the inner supporting plate 331 moves downwards, the linkage of the main shaft 42 and the main shaft sleeve 321 can be triggered; the reset mechanism 34 is connected with the inner supporting plate 331, and can reset the inner supporting plate 331.

In consideration of the load of the foreign matters in the filter tub 31 and the feedback of the weight of the foreign matters, the structure of the inner support plate 331 is added, and as shown in fig. 5, the inner support plate 331 corresponds to the inner structure of the filter tub 31, which is a horizontally arranged plate body, and the foreign matters may be remained on the inner support plate 331. When the total weight of the sundries exceeds the preset value, the inner supporting plate 331 reaches the triggering position for triggering the linkage under the action of the weight of the sundries.

The linkage assembly 33 further includes a first linkage 332 and a second linkage 333 based on the above embodiments. The first linkage member 332 is fixedly connected with the inner supporting plate 331, and extends below the inner supporting plate 331, and the inner supporting plate 331 can drive the first linkage member 332 to trigger the linkage of the spindle 42 and the spindle sleeve 321 through displacement. The second linkage 333 is a block arranged inside the spindle sleeve 321, one is arranged corresponding to each filter vat 31, and the second linkage 333 can horizontally move transversely; the second linkage 333 is provided with a second engagement portion on a side facing the main shaft 42. The main shaft 42 is provided with a first clamping portion 421 corresponding to the second clamping portion, the first clamping portion 421 is disposed on the shaft body of the main shaft 42, when the inner supporting plate 331 moves down, the first linkage member 332 can drive the second linkage member 333 to move laterally, and the first clamping portion 421 and the second clamping portion are clamped.

With this structure, when the inner pallet 331 moves down in position under the action of the weight of the sundries, the first linkage 332 synchronously performs the descending operation, and in the descending process of the first linkage 332, a transverse pushing force is applied to the second linkage 333, so that the spindle 42 inside the spindle sleeve 321 of the second linkage 333 moves, and the first clamping portion 421 and the second clamping portion are clamped together, so that the spindle sleeve 321 and the spindle 42 synchronously rotate, thereby realizing the rotation of the filter vat 31. The structure can realize linkage by means of mechanical transmission, does not need to use a sensing assembly, is used as a special working environment of a sewage well, and is easy to influence by the environment.

On the basis of the above embodiment, the first linkage 332 may adopt a linkage structure of a rod combination, which includes a vertical rod 3321 penetrating the inner support plate 331 and a cross bar 3322 located at the top of the vertical rod 3321, as shown in fig. 5, the lower end of the vertical rod 3321 extends below the inner support plate 331, and the cross bar 3322 is disposed toward the second linkage 33. The side of the cross bar 3322 facing the second linkage 333 is provided with an urging surface of an inclined surface.

As shown in fig. 4, the second linkage 333 has a block structure, and an inclined force receiving surface corresponding to the force applying surface is provided toward the first linkage 332, and the second engaging portion of the second linkage 333 adopts a tooth structure in this embodiment. The first engaging portion 421 has a corresponding spline structure. When the inner support plate 331 descends, the vertical rod 3321 drives the cross bar 3322 to move downward, and the force application surface of the cross bar 3322 pushes the force application surface of the second linkage 333, so as to push the second linkage 333 toward the main shaft 42, and the second clamping portion and the first clamping portion 421 are contacted and clamped together. Since the second moving member 333 is fitted into the through groove 3211 in the inner wall of the spindle sleeve 321, the spindle sleeve 321 can rotate together with the spindle 42 in the locked state, and the effect of interlocking the filter vat 31 and the spindle 42 by the weight of the inner support plate 331 is achieved.

On the basis of the above embodiment, referring to fig. 3 to 5, the reset mechanism includes a first reset assembly 341 that can reset the inner blade 331 in the vertical direction, and a second reset assembly 342 that can reset the second linkage 333. And the two reset piece assemblies are combined to release the linkage state.

The embodiment provides a specific embodiment of a first reset assembly 341, where a reset bracket 3411 is fixedly disposed at the upper inner portion of a filter vat 31, a vertical first reset spring 3412 is disposed between a vertical rod 3321 and the reset bracket 3411, when the vertical rod 3321 is displaced in the vertical direction, the first reset spring 3412 deforms, and after impurities on an inner support plate 331 are removed, the first reset spring 3412 drives the inner support plate 331 to reset, so that the linkage between the spindle sleeve 321 and the spindle 42 is not triggered.

The second return assembly 342 includes a second return spring provided on the block of the second linkage 333, by which the second linkage 333 is returned after the horizontal displacement.

On the basis of the above embodiment, different mounting structures may be adopted according to the mounting form of the first return spring 3412. The scheme adopts the structure form that a reset rod is arranged on one side of a vertical rod 3321 in parallel, the lower end of the reset rod is fixedly connected with an inner supporting plate 331, the upper end of the reset rod penetrates through the beam structure of a reset bracket 3411, meanwhile, the upper end of the reset rod is connected with a cross rod 3322, a first reset spring 3412 is sleeved on the outer side of the upper part of the reset rod, and the lower end of the first reset spring 3412 is positioned on the upper side of the beam of the reset bracket 3411.

On the basis of the above embodiment, the reset structure 34 further includes a reset base table 343, a spherical block is provided at the bottom end of the vertical rod 3321, the upper surface of the reset base table 343 is an annular structural surface corresponding to the spherical block, and the upper surface of the reset base table 343 includes a high level and a low level, and an inclined transition surface is provided between the high level and the low level.

In the initial state, the bottom end of the vertical rod 3321 of the filter vat 31 close to the water inlet 11 is positioned at the upper position of the low level, a space is reserved between the spherical block and the low level, when the inner supporting plate 331 of the filter vat 331 moves down, the vertical rod 3321 descends, the spherical block falls on the upper surface of the low level, the spindle sleeve 321 is triggered to be linked, the filter vat 31 moves to the lower part of the taking-out opening along with the rotation of the spindle sleeve 321 by a unit angle, the spherical block of the vertical rod 3321 enters the area of the high level through the transition surface of the reset bottom plate 343, the high level jacks up the vertical rod 3321 from bottom to top at the moment, the second linkage 333 is reset, the linkage state is released, and the spindle sleeve 321 does not rotate along with the spindle 42.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A prefabricated drainage well cleaning mechanism comprising a filter assembly (3) which can be arranged inside a drainage well, characterized in that the filter assembly (3) comprises:

The filter vat set comprises a plurality of filter vats (31) which are detachably arranged; the filter barrels (31) are distributed and arranged in a circumferential array; the wall of the filter barrel (31) is provided with filter holes; the whole filter vat set is rotatable:

a drive mechanism, the drive mechanism comprising:

A motor (41) which is positioned below the filter assembly (3) and is used as a power source of the driving mechanism;

A main shaft (42) which is linked with a motor shaft of the motor (41) and is driven to rotate by the motor (41); a spindle (42) is coupleable with the filter cartridge assembly.

2. A prefabricated drainage well cleaning mechanism according to claim 1, wherein said filter assembly (3) further comprises:

The main support (32) is provided with a plurality of installation positions corresponding to the filter vat (31) on the main support (32); the middle part of the main support (32) is fixedly connected with a main shaft sleeve (321), the main shaft sleeve (321) is sleeved with the main shaft (42), and the main support (32) can be linked with the main shaft (42) through the main shaft sleeve (321);

When the impurity weight in the filter vat (31) exceeds a preset value, the main shaft (42) can drive the main support (32) to rotate by an angle value through the main shaft sleeve (321), and the angle value meets the following conditions:

α＝360°/n

Wherein alpha is the angle of each rotation of the spindle sleeve (321), and n is the number of filter barrels (31) in the filter barrel group.

3. The prefabricated drainage well cleaning mechanism of claim 1 wherein the main support (32) further comprises:

an outer supporting plate (322) with a water draining groove on the plate body;

The baffle (323) is fixedly arranged on the upper side of the outer supporting plate (322), the number of the baffle (323) corresponds to that of the filter barrels (31), and the baffle (323) is positioned between two adjacent filter barrels (31).

4. A prefabricated drainage well cleaning mechanism as claimed in claim 3, characterized in that a clamping groove and a clamping block matched positioning structure are arranged between the outer supporting plate (322) and the filter drum (31);

And a drainage groove is formed in the partition plate (323).

5. A prefabricated drainage well cleaning mechanism as claimed in claim 3, wherein said main support (32) further comprises:

the upper frame (324) is an annular frame fixedly arranged at the upper end of the main shaft sleeve (321).

6. A prefabricated drainage well cleaning mechanism according to claim 1, wherein said filter assembly (3) further comprises:

Linkage assembly (33), filter vat (31) pass through linkage assembly (33) with main shaft (42), linkage assembly (33) include:

An inner supporting plate (331) corresponding to each filter vat (31) and positioned at the inner side of the lower part of the filter vat (31); the inner supporting plate (331) can be lifted or lowered in the vertical direction, a filtering hole is formed in the plate body of the inner supporting plate (331), and when the inner supporting plate (331) moves downwards, the linkage of the main shaft (42) and the main shaft sleeve (321) can be triggered;

And the reset mechanism (34) is connected with the inner supporting plate (331) and can reset the inner supporting plate (331).

7. The prefabricated drainage well cleaning mechanism of claim 6 wherein said linkage assembly (33) further comprises:

The first linkage piece (332) is fixedly connected with the inner supporting plate (331) and extends to the lower portion of the inner supporting plate (331), and the inner supporting plate (331) can drive the first linkage piece (332) to trigger linkage of the main shaft (42) and the main shaft sleeve (321) through displacement.

8. The prefabricated drainage well cleaning mechanism of claim 7, wherein said linkage assembly (33) further comprises:

The second linkage part (333) is a block arranged in the main shaft sleeve (321), one is arranged corresponding to each filter drum (31), and the second linkage part (333) can transversely move in the horizontal direction; a second clamping part is arranged on one side of the second linkage member (333) facing the main shaft (42);

The spindle (42) includes:

the first clamping part (421) is arranged on the shaft body of the main shaft (42) and corresponds to the second clamping part, when the inner supporting plate (331) moves downwards, the first linkage piece (332) can drive the second linkage piece (333) to move transversely, and the first clamping part (421) and the second clamping part are clamped.

9. The prefabricated drainage well cleaning mechanism of claim 8, wherein said reset mechanism comprises:

The first reset component (341) can reset the inner supporting plate (331) in the vertical direction;

A second reset assembly (342) for resetting the second linkage (333).

10. A prefabricated drainage well cleaning mechanism according to claim 9, characterized in that a spherical block is provided below said inner pallet (331), said resetting mechanism (34) further comprising:

The upper surface of the reset base table (343) is an annular structural surface corresponding to the moving path of the spherical block, the upper surface of the reset base table (343) comprises a high horizontal plane and a low horizontal plane, and an inclined transition surface is arranged between the high horizontal plane and the low horizontal plane;

In the initial state, the spherical block below the filter drum (31) close to the water inlet of the drainage well is positioned above the low level of the reset base table (343), and a space is reserved between the spherical block and the low level.