CN220816941U - Rolling mill dust removal pipeline connection structure and rolling mill dust removal system - Google Patents

Abstract

The utility model provides a mill dust removal pipeline connecting structure and a mill dust removal system, comprising a down-bent pipeline and an upper straight pipeline; the lower bending pipeline is fixedly connected with the rolling mill body, one end of the lower bending pipeline is used for being connected with a dust discharging interface of a side dust hood of the rolling mill body, and the other end of the lower bending pipeline is bent upwards and extends and is provided with a first connecting part; the top end of the upper straight pipeline is fixedly connected with a main pipeline of the dust removal system, and the lower end of the upper straight pipeline is provided with a second connecting part which is level with the first connecting part in height; the first connecting part is separated from the second connecting part when the down-bent pipeline translates along with the rolling mill body, and the first connecting part is in sealing butt joint with the second connecting part when the down-bent pipeline translates along with the rolling mill body and resets. According to the mill dust removal pipeline connecting structure and the mill dust removal system, the downturned pipeline and the upper straight pipeline can be mutually separated when the mill body translates, and are in sealing butt joint again when the mill body resets, so that the maintenance working efficiency of the mill can be improved.

Description

Rolling mill dust removal pipeline connection structure and rolling mill dust removal system

Technical Field

The utility model belongs to the technical field of steel rolling dust removal, and particularly relates to a rolling mill dust removal pipeline connection structure and a rolling mill dust removal system.

Background

The environmental protection dust removal measure is the important component part in the steel rolling workshop, and because a large amount of flue gas dust can be produced in the rolling mill in the steel rolling process, therefore, each rolling mill is required to be provided with a dust hood at the front side or the rear side, and the dust hood is connected with a main pipeline of a workshop dust removal system, so that the flue gas dust in the steel rolling process can be discharged into the dust removal system. Because the rolling mill needs to translate to the side of the binding wire on the ground rail when overhauling, such as roll changing, a side dust hood of the rolling mill needs to be detached from the dust removal system.

At present, a side dust hood of a rolling mill is connected with a main pipeline of a dust removal system through a dust removal bent pipe, one end of the dust removal bent pipe is connected with a dust discharge interface flange of the side dust hood, when the rolling mill needs to be moved, a circle of bolts of a connecting flange need to be removed, the process is very time-consuming and labor-consuming, and improvement is needed.

Disclosure of utility model

The embodiment of the utility model provides a connecting structure of a dust removing pipeline of a rolling mill and a dust removing system of the rolling mill, which aim to solve the problem that the time and the labor are wasted when a dust removing bent pipe is detached during overhauling and moving of the rolling mill, and improve the working efficiency.

In order to achieve the above purpose, the utility model adopts the following technical scheme: in a first aspect, a dust removing pipeline connecting structure of a rolling mill is provided, which comprises a lower bent pipeline and an upper straight pipeline; the lower bending pipeline is fixedly connected with the rolling mill body, one end of the lower bending pipeline is used for being connected with a dust discharging interface of a side dust hood of the rolling mill body, and the other end of the lower bending pipeline is bent upwards and extends and is provided with a first connecting part; the top end of the upper straight pipeline is fixedly connected with a main pipeline of the dust removal system, and the lower end of the upper straight pipeline is provided with a second connecting part which is level with the first connecting part in height; the first connecting part is separated from the second connecting part when the down-bent pipeline translates along with the rolling mill body, and the first connecting part is in sealing butt joint with the second connecting part when the down-bent pipeline translates along with the rolling mill body and resets.

With reference to the first aspect, in one possible implementation manner, the first connection portion includes a first connection ring and a first half-round cover; the first connecting ring is sleeved at the bending extension end of the downward bent pipeline; the first semicircular cover is arranged around the outer edge of the first connecting ring, and the top end of the first semicircular cover is fixedly connected with the first connecting ring; the second connecting part comprises a second connecting ring and a second semicircular cover; the second connecting ring is sleeved at the lower end of the upper straight pipe; the second semicircular cover is arranged around the outer edge of the second connecting ring, and the bottom end of the second semicircular cover is fixedly connected with the second connecting ring; wherein the first half-round cover and the second half-round cover are separated along the horizontal direction when the down-bent pipeline translates along with the rolling mill body; when the down-bent pipeline resets along with the rolling mill body, the first semicircular cover and the second semicircular cover are horizontally butted to form a closed circle, the top end of the first semicircular cover is in sealing fit with the lower annular surface of the second connecting ring, and the bottom end of the second semicircular cover is in sealing fit with the upper annular surface of the first connecting ring.

In some embodiments, the first connecting portion further includes a first inner seal ring connected to the first connecting ring and distributed opposite to the first half-round cover; the second connecting part further comprises a second inner sealing ring, and the second inner sealing ring is connected with the second connecting ring and is distributed opposite to the second semicircular cover; when the first semicircular cover and the second semicircular cover are horizontally abutted to form a closed circle, the outer ring surface of the first inner sealing ring is in sealing fit with the inner peripheral wall of the second semicircular cover, and the outer ring surface of the second inner sealing ring is in sealing fit with the inner peripheral wall of the first semicircular cover.

The top end face of the first inner sealing ring is a first inclined face, and the bottom end face of the second inner sealing ring is a second inclined face; when the down-bent pipeline is reset along with the translation of the rolling mill body, the vertical distance between the first inclined plane and the second inclined plane is gradually reduced.

For example, a first sealing felt strip is arranged on the outer ring surface of the first inner sealing ring, and a second sealing felt strip is arranged on the outer ring surface of the second inner sealing ring.

In some embodiments, a third sealing felt strip is provided on both circumferential end walls of the first and/or second half-shells; and when the first semicircular cover and the second semicircular cover are in butt joint, two ends of the third sealing felt strip are respectively abutted against the first sealing felt strip and the second sealing felt strip.

Illustratively, the top two corners of the first half-dome are each provided with a first chamfer, and the bottom two corners of the second half-dome are each provided with a second chamfer.

In some embodiments, the outer annular surfaces at two circumferential ends of the first inner sealing ring are respectively adhered and fixed with the inner wall surfaces at two circumferential ends of the first semicircular cover; the outer ring surfaces at the two circumferential ends of the second inner sealing ring are respectively attached and fixed with the inner wall surfaces at the two circumferential ends of the second semicircular cover.

In some embodiments, the outer walls of the two circumferential ends of the first half-round cover are provided with first connecting lugs, the outer walls of the two circumferential ends of the second half-round cover are provided with second connecting lugs, and when the first half-round cover is in butt joint with the second half-round cover, the two first connecting lugs are respectively and correspondingly connected with the two second connecting lugs through fasteners.

The connecting structure of the dust removing pipeline of the rolling mill has the beneficial effects that: compared with the prior art, the connecting structure of the dust removing pipeline of the rolling mill has the advantages that the first connecting part arranged on the lower bent pipeline and the second connecting part arranged on the upper straight pipeline can be separated and sealed in the horizontal direction, when the rolling mill body needs to be translated, the lower bent pipeline is separated from the upper straight pipeline along with the translation of the rolling mill body, and the lower bent pipeline returns along with the rolling mill body when the rolling mill body resets, so that the sealing butt joint is formed between the first connecting part and the second connecting part along the translation wind direction, the problem that time and labor are wasted due to the disassembly of the dust removing pipeline when the rolling mill is overhauled is solved, the labor intensity is reduced, and the overhauling working efficiency of the rolling mill body is improved.

In a second aspect, the embodiment of the utility model also provides a mill dust removal system, which comprises the mill dust removal pipeline connection structure.

Compared with the prior art, the rolling mill dedusting system has the advantages that the downward bent pipeline and the upper straight pipeline are connected through the first connecting part and the second connecting part, can be mutually separated when the rolling mill body is in translation, and are in resealing butt joint when the rolling mill body is reset, so that the problems of time and labor waste caused by disassembling the dedusting pipeline when the rolling mill is overhauled can be solved, the labor intensity can be reduced, and the overhauling working efficiency of the rolling mill body can be improved.

Drawings

Fig. 1 is a schematic diagram of a front view structure of a connection structure of a dust removing pipeline of a rolling mill according to an embodiment of the present utility model;

fig. 2 is a schematic perspective view of a connection structure of a dust removing pipeline of a rolling mill according to an embodiment of the present utility model;

Fig. 3 is a schematic diagram of a split structure of a connection structure of a dust removing pipeline of a rolling mill according to an embodiment of the present utility model;

Fig. 4 is a schematic perspective view of a first connection portion according to an embodiment of the present utility model;

Fig. 5 is a schematic perspective view of a second connection portion according to an embodiment of the present utility model;

fig. 6 is a schematic diagram of a butt joint sealing structure of a connection structure of a dust removing pipeline of a rolling mill according to an embodiment of the utility model.

In the figure: 10. a down-turned pipe; 11. a first connection portion; 111. a first connection ring; 112. a first half-round cover; 1121. a third sealing felt strip; 1122. a first chamfer; 1123. a first connection lug; 113. a first inner seal ring; 1131. a first inclined surface; 1132. a first sealing felt strip; 20. a straight pipe is arranged; 21. a second connecting portion; 211. a second connecting ring; 212. a second semi-circular cap; 2121. a second chamfer; 2122. a second connecting ear; 2123. a fastener; 213. a second inner seal ring; 2131. a second inclined surface; 2132. a second sealing felt strip; 30. a side dust hood.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. It is to be understood that the terms "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship based on that shown in the drawings, merely to facilitate describing the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 to 6, a description will be given of a dust removing pipeline connection structure of a rolling mill according to the present utility model. The mill dust removal pipeline connecting structure comprises a down-bent pipeline 10 and an upper straight pipeline 20; the lower bent pipeline 10 is fixedly connected with the rolling mill body, one end of the lower bent pipeline 10 is used for being connected with a dust discharging interface of a side dust hood 30 of the rolling mill body, and the other end of the lower bent pipeline is bent upwards to extend and is provided with a first connecting part 11; the top end of the upper straight pipe 20 is fixedly connected with a main pipe of the dust removal system, the lower end of the upper straight pipe is provided with a second connecting part 21, and the second connecting part 21 is level with the first connecting part 11 in height; wherein, the first connecting portion 11 is separated from the second connecting portion 21 when the down-bent pipe 10 translates along with the rolling mill body, and the first connecting portion 11 is in sealing butt joint with the second connecting portion 21 when the down-bent pipe 10 translates along with the rolling mill body and resets.

The dust removal of the rolling mill body is realized based on a side dust hood 30 arranged on the feeding side or the discharging side of the rolling mill body, and a dust discharge port is arranged on the side dust hood 30; the main pipeline of the dust removing system of the steel rolling workshop is erected at high altitude, so that at least one bend is needed to realize the connection of the side dust removing cover 30 and the main pipeline; specifically, in this embodiment, one end of the downturned pipeline 10 is connected with the side dust hood 30 through a flange, and the top end of the upper straight pipeline 20 is directly welded and fixed with the main pipeline of the dust removal system or is fixedly connected based on a three-way joint.

In this embodiment, the relative position between the main pipe of the dust removal system and the main pipe of the rolling mill body is fixed in the normal working state, so the relative positions of the upper straight pipe 20 fixed to the main pipe and the lower bent pipe 10 fixedly connected to the side dust hood 30 are also fixed in the working position of the rolling mill body, thus, the first connecting portion 11 and the second connecting portion 21 can be in butt joint fit without a connecting structure, or an auxiliary connecting structure such as a hoop can be added on the basis of butt joint to improve the connection tightness and reliability, and it should be understood that even if the hoop structure of auxiliary connection is added, the disassembly process is labor-saving and efficient compared with the disassembly of one circle of flange connecting bolts of the side dust hood 30.

Compared with the prior art, the connecting structure for the dust removing pipeline of the rolling mill provided by the embodiment has the advantages that the first connecting part 11 arranged on the lower bent pipeline 10 and the second connecting part 21 arranged on the upper straight pipeline 20 can be separated and sealed in the horizontal direction, when the rolling mill body needs to be translated, the lower bent pipeline 10 is separated from the upper straight pipeline 20 along with the translation of the rolling mill body, and the lower bent pipeline 10 returns along with the rolling mill body along with the translation of the rolling mill body when the rolling mill body is reset, so that the sealing butt joint is formed again by the first connecting part 11 and the second connecting part 21 along the translation wind direction, the problem that time and labor are wasted due to the disassembly of the dust removing pipeline when the rolling mill is overhauled is solved, the labor intensity is reduced, and the overhauling work efficiency of the rolling mill body is improved.

In some embodiments, referring to fig. 3 to 6, the first connection part 11 includes a first connection ring 111 and a first half-round 112; the first connecting ring 111 is sleeved on the bending extension end of the lower elbow pipe 10; the first semicircular cover 112 is arranged around the outer edge of the first connecting ring 111 and the top end is fixedly connected with the first connecting ring 111; the second connection part 21 includes a second connection ring 211 and a second semicircular cap 212; the second connecting ring 211 is sleeved at the lower end of the upper straight pipe 20; the second semicircular cover 212 is arranged around the outer edge of the second connecting ring 211, and the bottom end of the second semicircular cover is fixedly connected with the second connecting ring 211; wherein the first half-round 112 and the second half-round 212 separate in a horizontal direction as the down-turned pipe 10 translates with the mill body; when the down-bent pipeline 10 is reset along with the rolling mill body, the first semicircular cover 112 and the second semicircular cover 212 are horizontally butted to form a closed circle, the top end of the first semicircular cover 112 is in sealing fit with the lower annular surface of the second connecting ring 211, and the bottom end of the second semicircular cover 212 is in sealing fit with the upper annular surface of the first connecting ring 111.

The first connecting ring 111 and the first semicircular cover 112 can form the first connecting part 11 of an L-shaped structure, the second connecting ring 211 and the second semicircular cover 212 can form the second connecting part 21 of an inverted L-shaped structure, the two L-shaped structures can be abutted to form a closed circular structure along the horizontal direction, and meanwhile, the two L-shaped structures can be separated from each other along the horizontal direction conveniently, on the basis, after the first connecting part 11 and the second connecting part 21 are abutted, the top end of the first semicircular cover 112 can be in sealing fit with the lower annular surface of the second connecting ring 211, and the bottom end of the second semicircular cover 212 is in sealing fit with the upper annular surface of the first connecting ring 111, so that the sealing abutting joint between the first connecting part 11 and the second connecting part 21 is realized, and smoke leakage is avoided.

As a specific embodiment of the first connecting portion 11 and the second connecting portion 21, referring to fig. 3 to 5, the first connecting portion 11 further includes a first inner sealing ring 113, and the first inner sealing ring 113 is connected to the first connecting ring 111 and is distributed opposite to the first half-circular cover 112; the second connecting portion 21 further includes a second inner sealing ring 213, where the second inner sealing ring 213 is connected to the second connecting ring 211 and is distributed opposite to the second semicircular cover 212; when the first half-round cover 112 and the second half-round cover 212 are horizontally abutted to form a closed circle, the outer ring surface of the first inner sealing ring 113 is in sealing fit with the inner peripheral wall of the second half-round cover 212, and the outer ring surface of the second inner sealing ring 213 is in sealing fit with the inner peripheral wall of the first half-round cover 112.

The first inner sealing ring 113 and the second inner sealing ring 213 can be respectively bonded with the inner wall of the second semicircular cover 212 and the inner wall of the first semicircular cover 112 in the circumferential direction, so that the area of a sealing bonding area between the first connecting portion 11 and the second connecting portion 21 is increased, the connection tightness between the first connecting portion 11 and the second connecting portion 21 is further improved, and smoke leakage is avoided.

It should be noted that, referring to fig. 3, the top end surface of the first inner sealing ring 113 is a first inclined surface 1131, and the bottom end surface of the second inner sealing ring 213 is a second inclined surface 2131; as the down-turned pipe 10 is reset in translation with the mill body, the vertical spacing between the first inclined surface 1131 and the second inclined surface 2131 gradually decreases. The purpose of adopting the inclined surface structure is to avoid the first inner seal ring 113 and the second inner seal ring 213 from horizontally colliding in the process of resetting and butting the first connecting part 11 close to the second connecting part 21, thereby ensuring the reliability and smoothness of the butting seal of the first connecting part 11 and the second connecting part 21.

In order to improve the butt-joint tightness of the first connection portion 11 and the second connection portion 21, referring to fig. 3, a first sealing felt strip 1132 is provided on an outer circumferential surface of the first inner seal ring 113, and a second sealing felt strip 2132 is provided on an outer circumferential surface of the second inner seal ring 213.

Further, referring to fig. 4 to 6, third sealing felt strips 1121 are provided on both circumferential end walls of the first half-round 112 and/or the second half-round 212; when the first and second semi-circular caps 112 and 212 are butted, both ends of the third sealing felt strip 1121 respectively collide with the first and second sealing felt strips 1132 and 2132. Since the first sealing felt strip 1132 and the second sealing felt strip 2132 are offset from each other in the height direction, leakage may occur at the circumferential end positions of the first sealing felt strip 1132 and the second sealing felt strip 2132, and therefore, a third sealing felt strip 1121 is provided at the end wall where the first half-round cover 112 and the second half-round cover 212 are butted against each other, and the third sealing felt strip 1121 is used to seal the upper and lower spaced positions of the first sealing felt strip 1132 and the second sealing felt strip 2132, so that a completely closed sealing structure is formed between the first connection part 11 and the second connection part 21 in the circumferential direction, thereby improving the reliability of butt joint sealing and avoiding leakage of smoke.

It should be understood that, in this embodiment, in order to improve the smoothness of the butt joint of the first connecting portion 11 and the second connecting portion 21, as shown in fig. 4 and 5, both corners of the top end of the first half-round 112 are provided with the first chamfer 1122, and both corners of the bottom end of the second half-round 212 are provided with the second chamfer 2121. It should be understood that, since the rolling mill body is a large-scale apparatus, the corresponding down-bent pipe 10 and the upper straight pipe 20 are also members with larger pipe diameters, there are certain errors in machining precision, installation precision and position precision, and in this case, in order to avoid interference collision between the first connecting portion 11 and the second connecting portion 21 due to vertical dislocation during the process of moving and resetting the down-bent pipe 10 along with the rolling mill body, chamfers are provided on the first semicircular cover 112 and the second semicircular cover 212, so that even when the top end of the first connecting portion 11 is higher than the bottom end of the second connecting portion 21, horizontal butt joint resetting can be successfully completed under the guiding action of the first chamfer 1122 and the second chamfer 2121.

In this embodiment, referring to fig. 4 and 5, the outer annular surfaces at the two circumferential ends of the first inner sealing ring 113 are respectively adhered and fixed to the inner wall surfaces at the two circumferential ends of the first half-dome 112; the outer annular surfaces at the two circumferential ends of the second inner sealing ring 213 are respectively adhered and fixed to the inner wall surfaces at the two circumferential ends of the second semicircular cover 212. On the one hand, the connection reliability between the first inner seal ring 113 and the first semicircular cover 112 and between the second inner seal ring 213 and the second semicircular cover 212 can be improved, and on the other hand, the overall structural strength of the first connecting portion 11 and the second connecting portion 21 can be improved, so that the influence on the butt joint sealing effect due to structural deformation can be avoided.

In some embodiments, referring to fig. 2, first connecting lugs 1123 are disposed on outer walls of two circumferential ends of the first half-round 112, second connecting lugs 2122 are disposed on outer walls of two circumferential ends of the second half-round 212, and when the first half-round 112 is docked with the second half-round 212, the two first connecting lugs 1123 are respectively connected with the two second connecting lugs 2122 correspondingly through fasteners 2123. The fixed connection to the first connecting portion 11 and the second connecting portion 21 can be achieved through the two fasteners 2123, not only is the disassembly and assembly difficulty small, but also the butt joint tightness between the first connecting portion 11 and the second connecting portion 21 can be improved, and further the connection reliability and the tightness are improved.

Based on the same inventive concept, as will be understood with reference to fig. 1 to 6, the embodiment of the application further provides a mill dust removal system, which comprises the mill dust removal pipeline connection structure.

Compared with the prior art, the mill dedusting system provided by the embodiment has the advantages that the lower bent pipeline 10 and the upper straight pipeline 20 are connected through the first connecting part 11 and the second connecting part 21, can be mutually separated when the mill body is horizontally moved, and are in resealing butt joint when the mill body is reset, so that the problems of time and labor waste caused by disassembling the dedusting pipeline when the mill is overhauled can be solved, the labor intensity can be reduced, and the overhauling working efficiency of the mill body can be improved.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. Rolling mill dust removal pipeline connection structure, its characterized in that includes:

The lower bending pipeline is fixedly connected with the rolling mill body, one end of the lower bending pipeline is used for being connected with a dust discharging interface of a side dust hood of the rolling mill body, and the other end of the lower bending pipeline is bent upwards to extend and is provided with a first connecting part;

the top end of the upper straight pipeline is fixedly connected with the main pipeline of the dust removal system, and the lower end of the upper straight pipeline is provided with a second connecting part which is level with the first connecting part in height;

The first connecting part is separated from the second connecting part when the down-bent pipeline translates along with the rolling mill body, and the first connecting part is in sealing butt joint with the second connecting part when the down-bent pipeline translates along with the rolling mill body and resets.

2. The mill dust removal pipe connection structure according to claim 1, wherein the first connection portion includes:

the first connecting ring is sleeved at the bending extension end of the downward bent pipeline;

The first semicircular cover is arranged around the outer edge of the first connecting ring, and the top end of the first semicircular cover is fixedly connected with the first connecting ring;

the second connection part includes:

the second connecting ring is sleeved at the lower end of the upper straight pipeline;

The second semicircular cover is arranged around the outer edge of the second connecting ring, and the bottom end of the second semicircular cover is fixedly connected with the second connecting ring;

Wherein the first half-round cap is separated from the second half-round cap in a horizontal direction when the down-turned pipeline translates with the mill body; when the downturned pipeline resets along with the rolling mill body, the first semicircular cover and the second semicircular cover are horizontally butted to form a closed circle, the top end of the first semicircular cover is in sealing fit with the lower annular surface of the second connecting ring, and the bottom end of the second semicircular cover is in sealing fit with the upper annular surface of the first connecting ring.

3. The mill dust removal pipe connection structure according to claim 2, wherein the first connection portion further comprises a first inner seal ring connected to the first connection ring and distributed opposite to the first half-round cover; the second connecting part further comprises a second inner sealing ring, and the second inner sealing ring is connected with the second connecting ring and distributed opposite to the second semicircular cover; when the first semicircular cover and the second semicircular cover are horizontally abutted to form a closed circle, the outer annular surface of the first inner sealing ring is in sealing fit with the inner peripheral wall of the second semicircular cover, and the outer annular surface of the second inner sealing ring is in sealing fit with the inner peripheral wall of the first semicircular cover.

4. The mill dust removal pipeline connection structure of claim 3, wherein a top end surface of the first inner seal ring is a first inclined surface, and a bottom end surface of the second inner seal ring is a second inclined surface; when the downturned pipeline is reset along with the translation of the rolling mill body, the vertical distance between the first inclined plane and the second inclined plane is gradually reduced.

5. A mill dust removal pipe connection as claimed in claim 3, wherein the outer annular surface of the first inner seal ring is provided with a first sealing felt strip, and the outer annular surface of the second inner seal ring is provided with a second sealing felt strip.

6. The dust removing pipeline connecting structure of rolling mill according to claim 5, wherein a third sealing felt strip is arranged on two circumferential end walls of the first semicircular cover and/or the second semicircular cover; and when the first semicircular cover is in butt joint with the second semicircular cover, two ends of the third sealing felt strip are respectively abutted against the first sealing felt strip and the second sealing felt strip.

7. The mill dust removal pipe connection structure of claim 6, wherein both corners at the top end of the first half-round cover are provided with a first chamfer, and both corners at the bottom end of the second half-round cover are provided with a second chamfer.

8. The dust removing pipeline connecting structure of the rolling mill according to claim 3, wherein the outer annular surfaces at the two circumferential ends of the first inner sealing ring are respectively adhered and fixed with the inner wall surfaces at the two circumferential ends of the first semicircular cover; the outer annular surfaces at the two circumferential ends of the second inner sealing ring are respectively attached and fixed with the inner wall surfaces at the two circumferential ends of the second semicircular cover.

9. The dust removing pipe connecting structure of rolling mill according to any one of claims 2 to 8, wherein first connecting lugs are provided on outer walls of both circumferential ends of the first half-round cover, second connecting lugs are provided on outer walls of both circumferential ends of the second half-round cover, and when the first half-round cover is abutted with the second half-round cover, the two first connecting lugs are respectively connected with the two second connecting lugs in a corresponding manner through fasteners.

10. A mill dust removal system comprising a mill dust removal pipe connection according to any one of claims 1 to 9.