CN113323022A

CN113323022A - Well lid device for municipal works

Info

Publication number: CN113323022A
Application number: CN202110628969.3A
Authority: CN
Inventors: 韩磊
Original assignee: Individual
Current assignee: Zhejiang Yixin Construction Engineering Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2021-08-31
Anticipated expiration: 2041-06-04
Also published as: CN113323022B

Abstract

The invention discloses a well lid device for municipal engineering, and belongs to the technical field of municipal engineering. A well lid device for municipal engineering comprises a well lid body, a plurality of air suction cylinders are annularly and equidistantly fixedly arranged on the bottom surface of the well lid body close to the edge, an inclined disc is sleeved in the middle of a center shaft, two compression columns are symmetrically arranged on the bottom surface of the inclined disc, two pistons are fixedly arranged at the lower ends of the compression columns, the bottom surfaces of the air suction cylinders are symmetrically communicated with two cylinders, the lower ends of the cylinders are connected with an air suction cover through a hose, one side of the upper end of the circumferential outer wall of the hose is provided with a check valve, and the structures are tightly matched, so that the device can generate power when pedestrians or automobiles pass through a well, the air suction cylinders can work, the air suction cover arranged inside can suck and discharge gas of a deep well under the well lid, a large amount of methane is prevented from being generated, the external dilution can not be discharged through the well lid, the occurrence of potential safety hazards is avoided, and the danger of well lid explosion if high temperature is met is avoided, the safety of the pedestrians is guaranteed.

Description

Well lid device for municipal works

Technical Field

The invention relates to the technical field of municipal engineering, in particular to a well cover device for municipal engineering.

Background

The well lid is used for covering deep road wells or road water channels and the like, and can prevent people or objects from falling. Tongzhou Liuhe casting can be divided into metal well covers, high-strength fiber cement concrete well covers, resin well covers and the like according to the materials. Generally, because various garbage mixtures such as sewage and the like circulate in deep wells of road water channels and the like, a large amount of methane or odor is generated and emitted to the outside through holes in well covers. The prior art publication No. CN112267492A provides a well lid device for municipal engineering, which is provided with a first telescopic rod, a first spring, a connecting plate, a pulling block and a pulling rope, so that a clamping column can be clamped in a fixed block on a well lid; the document of prior art publication No. CN206110188U provides a well lid device for municipal works, the device is through passing through the lug, damping spring I, the shock attenuation pole, the shock attenuation board, damping spring, the standing groove, the snubber block, steel sheet and fixed plate are mutually supported, can play the effect that reduces automobile pressure to the well lid, though the device beneficial effect is more, similar prior art CN108708399A that still has, adopt in other solutions in addition to set up air discharge fan or air pump under the well lid and carry out gaseous suction, for example CN105405270A, but still need lay extra power line, further aggravate its danger when meetting combustible gas, nevertheless still exist following problem: above-mentioned well lid design is too simple, has set up devices such as buffering, and the inequality can not avoid has a large amount of marsh gas to produce, can not discharge the external world through the well lid and dilute, has the potential safety hazard, if meet high temperature etc. have the danger of deep-fry well lid, has the foul smell simultaneously and distributes through the hole on the well lid, and the foul smell volatilizees not only for the puzzlement on the pedestrian leads to the fact the sense of smell, and the city appearance image of serious influence moreover, and in view of this, we propose a well lid device for municipal works.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to provide a well lid device for municipal engineering to solve the problems in the background technology.

2. Technical scheme

A well lid device for municipal engineering comprises a well lid body, wherein a plurality of circular grooves are formed in the upper surface of the well lid body at equal intervals in an annular mode, a buffer column is connected to the inner portion of each circular groove in a sliding mode, an annular groove communicated with the circular grooves is further formed in the upper surface of the well lid body, an annular ring body is arranged in the annular groove, an arc-shaped groove is formed in the top of each buffer column, the annular ring body penetrates through the arc-shaped grooves of the buffer columns simultaneously, a plurality of springs are fixedly arranged at the bottom of each buffer column at equal intervals in an annular mode, a plurality of circular cavities are formed in the well lid body at equal intervals in an annular mode, the circular grooves and the buffer columns are arranged in an inclined structure, and the lower ends of the springs are fixedly connected with the bottom surfaces of the circular grooves; a filtering column is arranged in the circular cavity, activated carbon is arranged in the filtering column, the upper end of the filtering column penetrates through the inside of the well lid body through a pipeline, extends to the outside and is communicated with a hose arranged on the outer wall of the circumference of the cylinder, and a methane concentration sensor is arranged in the middle of the bottom surface of the well lid body;

the manhole cover comprises a manhole cover body and is characterized in that a plurality of square cavities are annularly and equidistantly formed in the manhole cover body, two fixing blocks are symmetrically arranged on the upper side of the inner wall of each square cavity, a rotating shaft is rotatably connected between the two fixing blocks, a sleeve is rotatably connected to the middle of the rotating shaft, a supporting rod is welded to the outer wall of the circumference of the sleeve, the inner end of the supporting rod penetrates through the inner wall of each square cavity and extends to the inside of a circular groove, the inner end of the supporting rod is fixedly connected with one side of the outer wall of the circumference of a buffer column, a V-shaped rotating rod is rotatably connected to the outer side of the supporting rod through a pin shaft, the lower end of the V-shaped rotating rod is rotatably connected with a connecting rod through a pin shaft, and the upper end of the middle shaft penetrates through the inner wall of an air pumping cylinder and extends to the inside of each square cavity and is fixedly connected with the lower end of the connecting rod;

the manhole cover comprises a manhole cover body and is characterized in that a plurality of air cylinders are annularly and equidistantly arranged on the bottom surface of the manhole cover body close to the edge, a center shaft is rotatably connected to the middle of each air cylinder, an inclined disc is sleeved at the middle of each center shaft, two compression columns are symmetrically arranged on the bottom surface of each inclined disc, a limiting ball is welded to the upper end of each compression column, two spherical annular grooves are symmetrically formed in the bottom surface of each inclined disc, the spherical annular grooves are slidably connected with the limiting ball, two pistons are fixedly arranged at the lower ends of the compression columns, the bottom surfaces of the air cylinders are symmetrically communicated with the two cylinders, the lower ends of the pistons penetrate through the interiors of the air cylinders and extend into the interiors of the cylinders, the inner walls of the air cylinders are slidably connected, air suction covers are connected to the lower ends of the cylinders through hoses, and one-way valves are arranged on one sides of the upper ends of the outer walls of the circumferences of the hoses.

The filter column upper end passes through the inside outside and is linked together to extending of well lid body and with the external world through the pipeline, the filter column upper end passes through the inside outside and that extends to the outside of well lid body and with the hose that drum circumference outer wall set up is linked together through the pipeline.

The size of the inclined disc is matched with the inner diameter of the air pumping cylinder.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

1. the invention is characterized in that a plurality of air suction cylinders are annularly and equidistantly fixedly arranged on the bottom surface of the well lid body close to the edge, the middle part of the air suction cylinder is rotatably connected with a center shaft, the middle part of the center shaft is sleeved with an inclined disc, two pressing columns are symmetrically arranged on the bottom surface of the inclined disc, limiting balls are welded at the upper ends of the pressing columns, two pistons are fixedly arranged at the lower ends of the pressing columns, the bottom surfaces of the air suction cylinders are symmetrically communicated with two cylinders, the lower ends of the cylinders are connected with an air suction cover through a hose, one-way valves are arranged on one side of the upper end of the circumferential outer wall of the hose, and the structures are tightly matched, so that the device can generate power when pedestrians or automobiles pass through a well, thereby the air suction cylinders work, thereby the air suction cover arranged inside can suck and discharge gas of a deep well under the well lid, a large amount of methane is prevented from being generated, the external dilution can not be discharged through the well lid, the potential safety hazard is avoided, and the danger of well lid explosion if high temperature and the like is avoided, the safety of the pedestrians is guaranteed.

2. According to the invention, the annular circular grooves are formed on the surface of the well lid body at equal intervals, the buffer columns are connected in the circular grooves in a sliding manner, the springs are fixedly arranged on the bottoms of the buffer columns at annular equal intervals, the circular cavities are formed in the well lid body at annular equal intervals, the filter columns are arranged in the circular cavities, and the activated carbon is arranged in the filter columns.

3. According to the invention, the methane concentration sensor is arranged in the middle of the bottom surface of the well lid body, and the methane concentration sensor can monitor the methane concentration under the well lid in real time so as to ensure that the methane concentration is within a normal range; the upper side of the inner wall of the square cavity is symmetrically provided with two fixed blocks, a rotating shaft is rotatably connected between the two fixed blocks, the middle part of the rotating shaft is rotatably connected with a sleeve, the outer circumferential wall of the sleeve is welded with a supporting rod, the outer side of the supporting rod is rotatably connected with a V-shaped rotating rod through a pin shaft, the inner end of the supporting rod is fixedly connected with one side of the outer circumferential wall of the buffer column, so that passing pedestrians and vehicles pass through the well cover and are converted into rotation of a central shaft through the reciprocating motion of the supporting rod and the V-shaped rotating rod through the up-and-down motion of the buffer column, and an inclined disc is driven to rotate, so that gas can be extracted;

4. according to the invention, the maximum stress limit of each buffer column is improved and the uniformity of bottom gas emission can be improved at the same time through the matching of the annular body and the arc-shaped grooves of the plurality of buffer columns.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an expanded view of the inner structure of the well lid body according to the present invention;

FIG. 3 is a bottom view of the bottom structure of the well lid body of the present invention;

FIG. 4 is an exploded view of the bevel disk construction of the present invention;

FIG. 5 is a schematic diagram of the internal structure of the square chamber of the present invention;

the reference numbers in the figures illustrate: 1. a well lid body; 101. a circular groove; 102. a circular cavity; 103. a filtration column; 104. a square cavity; 2. a buffer column; 201. a spring; 3. a fixed block; 301. a rotating shaft; 302. a sleeve; 303. a support bar; 304. a V-shaped rotating rod; 305. a connecting rod; 4. an air pumping cylinder; 401. a middle shaft; 402. an inclined disc; 403. a spherical annular groove; 404. pressing the column; 405. a limiting ball; 406. a piston; 5. a cylinder; 501. a hose; 502. an air intake cover; 503. a one-way valve.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-5, the present invention provides a technical solution:

a well lid device for municipal engineering comprises a well lid body 1, wherein a plurality of circular grooves 101 are formed in the upper surface of the well lid body 1 at equal intervals in an annular mode, a buffer column 2 is connected to the inner portion of each circular groove 101 in a sliding mode, an annular groove communicated with the circular grooves 101 is further formed in the upper surface of the well lid body 1, an annular ring body is arranged in the annular groove, an arc-shaped groove is formed in the top of the buffer column 2 and penetrates through the arc-shaped grooves of the buffer columns 2, a plurality of springs 201 are fixedly arranged on the bottom surface of the buffer column 2 at equal intervals in an annular mode, a plurality of circular cavities 102 are formed in the well lid body 1 at equal intervals in an annular mode, the circular grooves 101 and the buffer columns 2 are arranged in an inclined structure, and the lower ends of the springs 201 are fixedly connected with the bottom surfaces of the circular grooves 101; a filtering column 103 is arranged in the circular cavity 102, activated carbon is arranged in the filtering column 103, the upper end of the filtering column 103 penetrates through the inside of the well lid body 1 through a pipeline, extends to the outside and is communicated with a hose arranged on the outer wall of the circumference of the cylinder 5, and a methane concentration sensor is arranged in the middle of the bottom surface of the well lid body 1;

a plurality of square cavities 104 are annularly and equidistantly formed in the well lid body 1, two fixing blocks 3 are symmetrically arranged on the upper side of the inner wall of each square cavity 104, a rotating shaft 301 is rotatably connected between the two fixing blocks 3, the middle part of the rotating shaft 301 is rotatably connected with a sleeve 302, supporting rods 303 are welded on the outer circumferential wall of the sleeve 302, the inner ends of the supporting rods 303 penetrate through the inner wall of each square cavity 104 and extend into the circular groove 101, the inner ends of the supporting rods 303 are fixedly connected with one side of the outer circumferential wall of the buffer column 2, the outer sides of the supporting rods 303 are rotatably connected with a V-shaped rotating rod 304 through pin shafts, the lower end of each V-shaped rotating rod 304 is rotatably connected with a connecting rod 305 through pin shafts, and the upper end of a central shaft 401 penetrates through the inner wall of an air pumping cylinder 4 and extends into the square cavity 104 and is fixedly connected with the lower end of the connecting rod 305;

the bottom surface of the well lid body 1 is close to the edge and is provided with a plurality of air pumping cylinders 4 at equal intervals in an annular manner, the middle parts of the air pumping cylinders 4 are rotatably connected with a center shaft 401, an inclined disc 402 is sleeved in the middle part of the center shaft 401, two compression columns 404 are symmetrically arranged on the bottom surface of the inclined disc 402, limiting balls 405 are welded at the upper ends of the compression columns 404, two spherical annular grooves 403 are symmetrically arranged on the bottom surface of the inclined disc 402, the spherical annular grooves 403 are slidably connected with the limiting balls 405, two pistons 406 are fixedly arranged at the lower ends of the compression columns 404, the bottom surface of the air pumping cylinders 4 is symmetrically communicated with two cylinders 5, the lower ends of the pistons 406 penetrate through the interiors of the air pumping cylinders 4 and extend to the interiors of the cylinders 5 and are slidably connected with the inner walls of the cylinders, the lower ends of the cylinders 5 are connected with an air suction cover 502 through hoses 501, and one side of the upper end of the circumferential outer wall of the hoses 501 is provided with a one-way valve 503.

Filter the inside outside and be linked together with the external world that extends of well lid body 1 that the pipeline passes in the post 103 upper end, filter the post 103 upper end and pass through the inside outside and that extends to of well lid body 1 and with the hose that 5 circumference outer walls of drum set up is linked together through the pipeline.

The size of the inclined disc 402 is adapted to the inner diameter of the suction tube 4.

Closely cooperate between the structure for the device can produce power through the well at pedestrian or car, thereby make the pump bowl 5 carry out work, thereby make the gas of deep well under the well lid of the cover 502 that breathes in of inside setting absorb the emission, avoided having had a large amount of marsh gas to produce, can not discharge the external condition of diluting through the well lid, avoided the emergence of potential safety hazard, avoided simultaneously if meet high temperature etc. have the danger of fried well lid, ensured pedestrian's security.

Specifically, circular slot 101 and bumping post 2 all are the slope structure setting, and spring 201 lower extreme is connected fixedly with circular slot 101 bottom surface. The circular groove 101 and the buffer column 2 are both arranged in an inclined structure, so that the buffer column 2 can move obliquely, the support rod 303 can be driven to move up and down, the support rod can adapt to the change of the track, and the V-shaped rotating rod 304 is driven to move back and forth.

Further, filter column 103 upper end and pass through the inside outside and be linked together with the external world that extends of well lid body 1 through the pipeline, filter column 103 upper end and pass through the inside hose that extends to the outside and set up with 5 circumference outer walls of drum of well lid body 1 through the pipeline and be linked together. So that the gas below the manhole cover body 1 can be discharged to the outside after passing through the filtering column 103.

Furthermore, the inner end of the support rod 303 penetrates through the inner wall of the square cavity 104 and extends into the circular groove 101, and the inner end of the support rod 303 is fixedly connected with one side of the circumferential outer wall of the buffer column 2. So that the cushion column 2 can drive the support rod 303 to reciprocate.

Furthermore, the lower end of the V-shaped rotating rod 304 is rotatably connected with a connecting rod 305 through a pin, and the upper end of the middle shaft 401 passes through the inner wall of the air extracting cylinder 4, extends into the square cavity 104, and is fixedly connected with the lower end of the connecting rod 305. The V-shaped rotating rod 304 reciprocates to drive the connecting rod 305 to rotate, so as to drive the middle shaft 401 to rotate, and further drive the inclined disc 402 to rotate.

It is worth to be noted that, two spherical annular grooves 403 are symmetrically formed in the bottom surface of the inclined disc 402, and the spherical annular grooves 403 are slidably connected with the limiting ball 405. The inclined disc 402 rotates, so that the limiting ball 405 reciprocates up and down due to the limiting ball 405 sliding in the spherical annular groove 403.

It is to be noted that the oblique disc 402 is sized to fit the internal diameter of the extraction cylinder 4, and the lower end of the piston 406 extends through the interior of the extraction cylinder 4 to the interior of the cylinder 5 and is slidingly connected to the inner wall thereof. The piston 406 is driven by the limit ball 405 to move up and down, so that the air can be pumped.

When the well lid device for municipal engineering is needed, firstly, the well lid body 1 is covered at a deep well opening, when a pedestrian vehicle passes through, the surface of the well lid body 1 is provided with a plurality of circular grooves 101 at equal intervals, the inside of the circular grooves 101 is connected with the buffer columns 2 in a sliding manner, the circular grooves 101 and the buffer columns 2 are arranged in an inclined structure, the lower ends of the springs 201 are fixedly connected with the bottom surfaces of the circular grooves 101, the circular grooves 101 and the buffer columns 2 are arranged in an inclined structure, so that the buffer columns 2 can move in an inclined manner, the support rods 303 can be driven to move up and down to adapt to the change of the track, the inner ends of the support rods 303 penetrate through the inner wall of the square cavity 104 and extend into the circular grooves 101, the inner ends of the support rods 303 are fixedly connected with one side of the circumferential outer wall of the buffer columns 2, so that the support rods 2 can drive the support rods 303 to reciprocate, and the V-shaped rotating rods 304 are driven to reciprocate, the lower end of the V-shaped rotating rod 304 is rotatably connected with a connecting rod 305 through a pin shaft, the upper end of a center shaft 401 passes through the inner wall of the air extracting cylinder 4 to extend into the square cavity 104 and is fixedly connected with the lower end of the connecting rod 305, the connecting rod 305 is driven to rotate through the reciprocation of the V-shaped rotating rod 304, so as to drive the center shaft 401 to rotate, so as to drive the inclined disc 402 to rotate, the bottom surface of the inclined disc 402 is symmetrically provided with two spherical annular grooves 403, the spherical annular grooves 403 are slidably connected with a limiting ball 405, the inclined disc 402 rotates, so as to enable the limiting ball 405 to reciprocate up and down as the limiting ball 405 slides in the spherical annular groove 403, as the lower end of a piston 406 passes through the inside of the air extracting cylinder 4 to extend into the inside of the cylinder 5 and is slidably connected with the inner wall of the air extracting cylinder, the piston 406 is driven to move up and down through the limiting ball 405, so as the upper end of the filter column 103 passes through the inside of the well cover body 1 through a pipeline to extend to the outside and is communicated with the outside, the upper end of the filter column 103 penetrates through the inside of the well lid body 1 through a pipeline, extends to the outside and is communicated with a hose arranged on the circumferential outer wall of the cylinder 5, so that gas below the well lid body 1 can be discharged to the outside after passing through the filter column 103;

wherein 1 upper surface of well lid body still is provided with the ring channel of a plurality of kerfs 101 of intercommunication, be provided with a tourus in this ring channel, top at buffering post 2 is provided with the arc recess, the tourus passes through the design of the arc recess of a plurality of buffering posts 2 simultaneously, the cooperation through the arc recess of the tourus of the ring body and a plurality of buffering posts makes the biggest atress limit of every buffering post can also improve the homogeneity that bottom gas distributed when obtaining the promotion, be particularly useful for the operation scene of well lid setting in the edge, because the orbit relatively fixed of traveling of this department pedestrian or vehicle only has partial buffering post can direct atress.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a well lid device for municipal works, includes well lid body (1), its characterized in that: the manhole cover comprises a manhole cover body (1), wherein a plurality of circular grooves (101) are formed in the upper surface of the manhole cover body (1) in an annular and equidistant mode, a buffer column (2) is connected to the inner portion of each circular groove (101) in a sliding mode, an annular groove communicated with the circular grooves (101) is further formed in the upper surface of the manhole cover body (1), an annular body is arranged in the annular groove, an arc-shaped groove is formed in the top of the buffer column (2), the annular body penetrates through the arc-shaped grooves of the buffer columns (2), a plurality of springs (201) are fixedly arranged on the bottom surface of the buffer column (2) in an annular and equidistant mode, a plurality of circular cavities (102) are formed in the manhole cover body (1) in an annular and equidistant mode, the circular grooves (101) and the buffer columns (2) are arranged in an inclined structure, and the lower ends of the; a filtering column (103) is arranged in the circular cavity (102), activated carbon is arranged in the filtering column (103), the upper end of the filtering column (103) penetrates through the inside of the well lid body (1) through a pipeline, extends to the outside and is communicated with a hose arranged on the outer wall of the circumference of the cylinder (5), and a methane concentration sensor is arranged in the middle of the bottom surface of the well lid body (1);

a plurality of square cavities (104) are annularly and equidistantly arranged in the well lid body (1), two fixing blocks (3) are symmetrically arranged on the upper side of the inner wall of the square cavity (104), a rotating shaft (301) is rotatably connected between the two fixing blocks (3), the middle part of the rotating shaft (301) is rotatably connected with a sleeve (302), the outer wall of the circumference of the sleeve (302) is welded with a support rod (303), the inner end of the support rod (303) passes through the inner wall of the square cavity (104) and extends to the inside of the circular groove (101), the inner end of the support rod (303) is fixedly connected with one side of the circumferential outer wall of the buffer column (2), the outer side of the supporting rod (303) is rotationally connected with a V-shaped rotating rod (304) through a pin shaft, the lower end of the V-shaped rotating rod (304) is rotationally connected with a connecting rod (305) through a pin shaft, the upper end of the middle shaft (401) penetrates through the inner wall of the air pumping cylinder (4), extends into the square cavity (104) and is fixedly connected with the lower end of the connecting rod (305);

the manhole cover comprises a manhole cover body (1), wherein a plurality of air pumping cylinders (4) are annularly and fixedly arranged on the bottom surface of the manhole cover body (1) close to the edge at equal intervals, the middle parts of the air pumping cylinders (4) are rotatably connected with a center shaft (401), an inclined disc (402) is sleeved in the middle part of the center shaft (401), two pressing columns (404) are symmetrically arranged on the bottom surface of the inclined disc (402), a limiting ball (405) is welded at the upper end of each pressing column (404), two spherical annular grooves (403) are symmetrically arranged on the bottom surface of the inclined disc (402), the spherical annular grooves (403) are slidably connected with the limiting ball (405), two pistons (406) are fixedly arranged at the lower ends of the pressing columns (404), the bottom surfaces of the air pumping cylinders (4) are symmetrically communicated with two cylinders (5), the lower ends of the pistons (406) penetrate through the interiors of the air pumping cylinders (4) and extend into the cylinders (5) and are slidably connected with the inner walls of the cylinders (5), and the lower ends of the cylinders (5) are connected with an air suction hood (502) through hoses (501), one side of the upper end of the circumferential outer wall of the hose (501) is provided with a one-way valve (503).

2. The manhole cover device for municipal engineering according to claim 1, wherein: filter post (103) upper end and pass inside extension to the outside of well lid body (1) and be linked together with the external world through the pipeline, filter post (103) upper end pass through the pipeline that well lid body (1) is inside to be extended to the outside and with the hose that drum (5) circumference outer wall set up is linked together.

3. The manhole cover device for municipal engineering according to claim 1, wherein: the size of the inclined disc (402) is matched with the inner diameter of the air suction cylinder (4).