Purging device and rolling mill thereof

Abstract

The invention discloses a purging device and a rolling mill thereof.The purging device comprises a telescopic assembly capable of stretching out and drawing back in the axial direction and a blowing pipe assembly, the blowing pipe assembly is arranged at one end of the telescopic assembly, and the other end of the telescopic assembly is rotatably arranged in the rolling mill; according to the blowing device, the pipe blowing assembly can be close to or far away from the pipe fitting through stretching and retracting of the telescopic assembly and running fit between the telescopic assembly and the rolling mill, then the pipe blowing assembly penetrates into the fin machining initial position of the rolling mill, and the problem that fin segments cannot be completely covered and blown in the prior art is solved; the rolling machine can be flexibly adjusted to be retracted and released, production adjustment is not affected, and in production, the rolling machine rolls the blowing device while conducting surface blowing on the rolled part of the pipe fitting and removing residual cutting fluid, so that residual stains on the surface are reduced, the residual cutting fluid is removed from the whole section of the pipe fitting, dry spots and accumulated dirt on the outer surface of the pipe fitting are eliminated, and the service life of the pipe fitting is prolonged. And the surface quality of the pipe fitting is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of rolling mills, and in particular to a blowing device and a rolling mill thereof. Background Art

[0002] In the high-efficiency tube rolling production, after the rolling is completed, the residual cutting fluid from the processing will be attached to the fin gaps of the copper tube in large quantities. The current common method is to remove the cutting fluid attached to the fin gaps of the copper tube after rolling production by soaking. However, in order to improve production efficiency, the copper tube is not immediately immersed after the rolling production is completed. Usually, a batch of tubes are produced and then put into cleaning together. In this process, the copper tube is exposed to the air, and the cutting fluid remaining in the fin gaps of the copper tube will dry and form dense stains, which are generally difficult to remove by soaking. The stains left on the surface of the copper tube will seriously aggravate the corrosion and oxidation of the copper tube surface, resulting in oxidation and blackening, affecting the surface quality of the high-efficiency tube, and will also aggravate the corrosion of the copper tube surface, which may prevent it from reaching its service life and fail and leak prematurely.

[0003] In order to solve the above problems, the copper tube is generally purged by a purging device. However, the conventional purging device is currently installed outside the rolling mill. There is a long section of the fin segment from the installation position to the starting end of the fin processing that cannot be purged, resulting in the surface quality of the section that cannot be purged being significantly lower than that of the purged section after cleaning and drying. Summary of the invention

[0004] The object of the present invention is to provide a purging device and a rolling mill thereof, aiming to solve the technical problem that the existing conventional purging device is installed outside the rolling mill, resulting in a long fin section from the installation position to the starting end of fin processing being unable to be purged.

[0005] In order to solve the above-mentioned problem, according to one aspect of the present application, an embodiment of the present invention provides a purging device for a rolling mill, wherein the rolling mill is provided with a pipe fitting, and the purging device comprises a telescopic assembly and a blow pipe assembly which can be axially extended and retracted, wherein the blow pipe assembly is arranged at one end of the telescopic assembly, and the other end of the telescopic assembly is rotatably arranged inside the rolling mill so that the blow pipe assembly can be close to or away from the pipe fitting.

[0006] In some embodiments, the telescopic assembly includes a first connecting rod and a second connecting rod, one end of the first connecting rod can be rotatably disposed inside the rolling mill, the blow pipe assembly is disposed at one end of the second connecting rod, and a circumferential relative rotation is constructed between the other end of the first connecting rod and the other end of the second connecting rod so that one end of the first connecting rod is close to or away from a first telescopic structure at one end of the second connecting rod.

[0007] In some embodiments, the first telescopic structure includes a first axial extension rod constructed at the other end of the first connecting rod and a first axial insertion hole arranged at the other end of the second connecting rod; the first axial extension rod is inserted into the first axial insertion hole, the outer wall of the first axial extension rod is configured with a first external thread, and the inner wall of the first axial insertion hole is configured with a first internal thread adapted to the first external thread.

[0008] In some embodiments, the first telescopic structure includes a second axial extension rod constructed at the other end of the second connecting rod and a second axial insertion hole arranged at the other end of the first connecting rod; the second axial extension rod is inserted into the second axial insertion hole, the outer wall of the second axial extension rod is configured with a second external thread, and the inner wall of the second axial insertion hole is configured with a second internal thread adapted to the second external thread.

[0009] In some embodiments, the purging device also includes a cartridge tube rotatably disposed at one end of the second connecting rod, the axis of the cartridge tube forms a preset angle with the axis of the second connecting rod, the preset angle is greater than 0° and less than 90°, and the blow pipe assembly is inserted into the cartridge tube.

[0010] In some embodiments, the inner wall of the insert tube is configured with an internal thread, and the outer wall of the blowpipe assembly is configured with an external thread; and / or the preset angle is 90°.

[0011] In some embodiments, the outer wall of the insertion tube is configured with a connecting portion extending toward the second connecting rod, an end of the connecting portion away from the insertion tube is configured with an insertion shaft, and one end of the second connecting rod is configured with a third axial insertion hole for inserting the insertion shaft.

[0012] In some embodiments, the purging device further includes a third connecting rod, which is connected to the rolling mill and rotatably connected to one end of the first connecting rod.

[0013] In some embodiments, the purge device also includes a rotating shaft, the side wall of the third connecting rod near one end of the first connecting rod is configured with a first chord section, a first through hole is opened at the first chord section, the side wall of the first connecting rod near one end of the third connecting rod is configured with a second chord section, a second through hole is opened at the second chord section, the first chord section is abutted against the second chord section, and the rotating shaft is passed through the first through hole and the second through hole.

[0014] In some embodiments, the purge device also includes a base, which is detachably arranged inside the rolling mill, and the end of the third connecting rod away from the first connecting rod is rotatably inserted into the side wall of the base, and when rotating, one end of the first connecting rod can be moved closer to or away from the base.

[0015] In some embodiments, the blowpipe assembly includes an air inlet end and an air outlet end, the air inlet end is connected to the air delivery pipe, the air outlet end faces the pipe, and the air outlet end gradually narrows in the air outlet direction.

[0016] According to another aspect of the present application, an embodiment of the present invention also provides a rolling mill, which includes a rolling mill head, a front guide sleeve bracket assembly and the purging device as described above, wherein a pipe fitting is installed on the guide sleeve bracket assembly, and the pipe fitting extends to the rolling mill head, and when the purging device includes a base and a first connecting rod, the base is arranged on the front guide sleeve bracket assembly, and the first connecting rod is located on the side of the front guide sleeve bracket assembly close to the rolling mill head.

[0017] Compared with the prior art, the purge device of the present invention has at least the following beneficial effects:

[0018] The embodiment of the present invention discloses a blowing device, which is used for a rolling mill, on which a pipe fitting is installed. The blowing device comprises a telescopic component and a blow pipe component which can be axially extended and retracted. The blow pipe component is arranged at one end of the telescopic component, and the other end of the telescopic component is rotatably arranged inside the rolling mill. The blowing device of the present invention can make the blow pipe component approach or move away from the pipe fitting through the extension and retraction of the telescopic component and the rotational cooperation between the telescopic component and the rolling mill, so that the blow pipe component can penetrate into the starting position of the fin processing of the rolling mill, thereby solving the problem that the fin segment cannot be fully covered and purged before, and the retraction and extension can be flexibly adjusted without affecting the production and machine adjustment. In production, the rolling mill rolls the blowing device while blowing the surface of the part of the pipe fitting that has been rolled to remove residual cutting fluid, thereby reducing residual surface stains, achieving the removal of residual cutting fluid from the entire section of the pipe fitting, eliminating dry spots and accumulated dirt on the outer surface of the pipe fitting, and ensuring the surface quality of the pipe fitting.

[0019] On the other hand, the rolling mill provided by the present invention is manufactured based on the above-mentioned purging device, and its beneficial effects can be found in the beneficial effects of the above-mentioned purging device, which will not be described in detail here.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the structure of a purge device provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the exploded structure of a purge device provided in an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the exploded structure of the purge device provided in an embodiment of the present invention from another perspective;

[0025] Figure 4 A cross-sectional view of a rolling mill provided by an embodiment of the present invention;

[0026] Figure 5 for Figure 4 A partial enlarged view of

[0027] Figure 6 A partially enlarged view of the rolling mill from another perspective provided in an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1. Pipe fittings;

[0030] 21. telescopic assembly; 211. first connecting rod; 2111. first axial extension rod; 2112. second chord section; 2113. second through hole;

[0031] 212, second connecting rod; 2121, first axial insertion hole; 2122, third axial insertion hole;

[0032] 22. Blowpipe assembly; 221. Air inlet end; 222. Air outlet end;

[0033] 23, plug-in tube; 231, connecting portion; 2311, plug-in shaft;

[0034] 24, third connecting rod; 241, first chord section; 2411, first through hole;

[0035] 25. Rotating shaft;

[0036] 26. Base;

[0037] 31. Roller head;

[0038] 32. Leading sleeve bracket assembly. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0040] In the description of the present invention, it should be clarified that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, but are not necessarily used to describe a specific order or sequence; the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, and do not mean that the referred device or element must have a specific direction or position, and therefore cannot be understood as a limitation on the present invention.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Example 1

[0043] like Figure 1-6 As shown, an embodiment of the present invention provides a purging device for a rolling mill, wherein the rolling mill is provided with a pipe fitting 1, and the purging device comprises an axially retractable telescopic component 21 and a blow pipe component 22, wherein the blow pipe component 22 is arranged at one end of the telescopic component 21, and the other end of the telescopic component 21 is rotatably arranged inside the rolling mill so that the blow pipe component 22 is close to or away from the pipe fitting 1.

[0044] In the present embodiment, the purging device is used for a rolling mill, on which a pipe 1 is mounted, and the purging device comprises an axially retractable telescopic component 21 and a blowpipe component 22, the blowpipe component 22 being arranged at one end of the telescopic component 21, and the other end of the telescopic component 21 being rotatably arranged inside the rolling mill. The purging device of the present embodiment can make the blowpipe component 22 approach or move away from the pipe 1 through the retraction and extension of the telescopic component 21 and the rotation between the telescopic component 21 and the rolling mill, thereby making the blowpipe component 22 penetrate into the starting position of the fin processing of the rolling mill, thereby solving the problem that the fin segment cannot be fully covered and purged before, and the retraction and extension can be flexibly adjusted without affecting the production and adjustment. In production, the rolling mill purifies the surface of the part of the pipe 1 that has been rolled while rolling the purging device to remove the residual cutting fluid, thereby reducing the residual stains on the surface, achieving the removal of the residual cutting fluid from the entire section of the pipe 1, eliminating the dry spots and accumulated dirt on the outer surface of the pipe 1, and ensuring the surface quality of the pipe 1.

[0045] In some embodiments, the telescopic assembly 21 includes a first connecting rod 211 and a second connecting rod 212, one end of the first connecting rod 211 can be rotatably disposed inside the rolling mill, the blow pipe assembly 22 is disposed at one end of the second connecting rod 212, and a first telescopic structure is constructed between the other end of the first connecting rod 211 and the other end of the second connecting rod 212, which enables one end of the first connecting rod 211 to axially approach or move away from one end of the second connecting rod 212 during circumferential relative rotation.

[0046] In this embodiment, a first telescopic structure is constructed between the other end of the first connecting rod 211 and the other end of the second connecting rod 212, so that one end of the first connecting rod 211 is axially closer to or farther away from one end of the second connecting rod 212 when the circumferential relative rotation occurs. When the second connecting rod 212 is rotated relative to the first connecting rod 211, the telescopic relationship between the first connecting rod 211 and the second connecting rod 212 is achieved, so that the blowpipe assembly 22 penetrates into the starting position of the fin processing of the rolling mill, thereby solving the problem that the fin segment cannot be fully covered and purged before, and the retraction and extension can be flexibly adjusted without affecting the production and machine adjustment. During production, the rolling mill rolls the blowing device while purging the surface of the part of the pipe 1 that has been rolled to remove residual cutting fluid, thereby reducing residual surface stains, achieving the removal of residual cutting fluid from the entire section of the pipe 1, eliminating dry spots and accumulated dirt on the outer surface of the pipe 1, and ensuring the surface quality of the pipe 1.

[0047] In some embodiments, the first telescopic structure includes a first axial extension rod 2111 constructed at the other end of the first connecting rod 211 and a first axial insertion hole 2121 at the other end of the second connecting rod 212; the first axial extension rod 2111 is inserted into the first axial insertion hole 2121, and the outer wall of the first axial extension rod 2111 is constructed with a first external thread, and the inner wall of the first axial insertion hole 2121 is constructed with a first internal thread adapted to the first external thread.

[0048] In this embodiment, a first axial extension rod 2111 is provided at the other end of the first connecting rod 211, a first axial insertion hole 2121 is provided at the other end of the second connecting rod 212, a first external thread is constructed on the outer wall of the first axial extension rod 2111, and a first internal thread is constructed on the inner wall of the first axial insertion hole 2121. By the cooperation between the first external thread of the first axial extension rod 2111 and the first internal thread of the first axial insertion hole 2121, the telescopic movement between the first connecting rod 211 and the second connecting rod 212 is achieved when the second connecting rod 212 is rotated relative to the first connecting rod 211.

[0049] In some embodiments, the first telescopic structure includes a second axial extension rod constructed at the other end of the second connecting rod 212 and a second axial insertion hole at the other end of the first connecting rod 211; the second axial extension rod is inserted into the second axial insertion hole, the outer wall of the second axial extension rod is configured with a second external thread, and the inner wall of the second axial insertion hole is configured with a second internal thread adapted to the second external thread.

[0050] In this embodiment, a second axial extension rod is set at the other end of the second connecting rod 212, a second axial insertion hole is set at the other end of the first connecting rod 211, and a second external thread is constructed on the outer wall of the second axial extension rod, and a second internal thread is constructed on the inner wall of the second axial insertion hole. Through the cooperation between the second external thread of the second axial extension rod and the second internal thread of the second axial insertion hole, the extension and retraction between the first connecting rod 211 and the second connecting rod 212 is achieved when the second connecting rod 212 is rotated relative to the first connecting rod 211.

[0051] In some embodiments, the purging device further comprises a cartridge tube 23 rotatably disposed at one end of the second connecting rod 212, the axis of the cartridge tube 23 and the axis of the second connecting rod 212 form a preset angle, the preset angle is greater than 0° and less than 90°, and the blowpipe assembly 22 is inserted into the cartridge tube 23. It is convenient to adjust the angle between the blowpipe assembly 22 and one end of the second connecting rod 212 in different directions, so that the blowpipe assembly 22 can perform surface purging on the part of the pipe 1 that has been rolled to remove the residual cutting fluid, thereby reducing the residual stains on the surface, achieving the removal of the residual cutting fluid from the entire section of the pipe 1, eliminating the dry spots and accumulated dirt on the outer surface of the pipe 1, and ensuring the surface quality of the pipe 1.

[0052] In some embodiments, the inner wall of the insert tube 23 is configured with an internal thread, and the outer wall of the blow pipe assembly 22 is configured with an external thread, so that the relative position between the two ends of the blow pipe assembly 22 and one end of the second connecting rod 212 can be adjusted, so that the blow pipe assembly 22 can blow the surface of the part of the pipe 1 that has been rolled to remove residual cutting fluid, thereby reducing residual stains on the surface, achieving the removal of residual cutting fluid from the entire section of the pipe 1, eliminating dry spots and accumulated dirt on the outer surface of the pipe 1, and ensuring the surface quality of the pipe 1.

[0053] In some embodiments, the preset angle is 90°.

[0054] In some embodiments, the outer wall of the insertion tube 23 is configured with a connecting portion 231 extending toward the second connecting rod 212, and the end of the connecting portion 231 away from the insertion tube 23 is configured with an insertion shaft 2311, and one end of the second connecting rod 212 is configured with a third axial insertion hole 2122 for inserting the insertion shaft 2311.

[0055] In this embodiment, the insertion shaft 2311 is constructed at the connection portion 231 of the insertion tube 23 , and a third axial insertion hole 2122 for inserting the insertion shaft 2311 is constructed at one end of the second connecting rod 212 , so that the insertion tube 23 can be rotatably arranged at one end of the second connecting rod 212 .

[0056] In some embodiments, the purge device also includes a third connecting rod 24, which is connected to the rolling mill and is rotatably connected to one end of the first connecting rod 211. By rotatably connecting the third connecting rod 24 to one end of the first connecting rod 211, the other end of the telescopic assembly 21 can be rotatably set inside the rolling mill.

[0057] In some embodiments, the purge device also includes a rotating shaft 25, and the side wall of the third connecting rod 24 near one end of the first connecting rod 211 is constructed with a first chord section 241, and a first through hole 2411 is opened at the first chord section 241; the side wall of the first connecting rod 211 near one end of the third connecting rod 24 is constructed with a second chord section 2112, and a second through hole 2113 is opened at the second chord section 2112; the first chord section 241 is abutted against the second chord section 2112, and the rotating shaft 25 is passed through the first through hole 2411 and the second through hole 2113.

[0058] In this embodiment, the rotating shaft 25 is inserted into the first through hole 2411 and the second through hole 2113 , so that the third connecting rod 24 is rotatably connected to the first connecting rod 211 .

[0059] In some embodiments, the purge device also includes a base 26, which is detachably disposed inside the rolling mill, and one end of the third connecting rod 24 away from the first connecting rod 211 is rotatably inserted into the side wall of the base 26, and when rotating, one end of the first connecting rod 211 can be moved closer to or away from the base 26.

[0060] In this embodiment, the base 26 is detachably arranged inside the rolling mill, and the end of the third connecting rod 24 far from the first connecting rod 211 is rotatably inserted into the side wall of the base 26, and when the third connecting rod 24 is rotated, one end of the first connecting rod 211 can be moved closer to or farther away from the base 26, so as to facilitate the disassembly and installation between the blowing device and the rolling mill. At the same time, when the third connecting rod 24 is rotated, one end of the first connecting rod 211 can be moved closer to or farther away from the base 26, so as to fine-tune the blowing pipe assembly 22 to be close to or away from the pipe fitting 1.

[0061] In some embodiments, the blowpipe assembly 22 includes an air inlet end 221 and an air outlet end 222, wherein the air inlet end 221 is connected to the air delivery pipe, the air outlet end 222 faces the pipe 1, and the air outlet end 222 gradually shrinks in the air outlet direction, so that it has sufficient air pressure to purge the surface of the pipe 1. An adjustable air pressure valve can be provided to adjust different air pressures to meet the purge requirements of different pipe types.

[0062] Example 2

[0063] An embodiment of the present invention also provides a rolling mill, which includes a rolling mill head 31, a front guide sleeve bracket assembly 32 and the purging device described in Example 1, wherein a pipe fitting 1 is installed on the guide sleeve bracket assembly, and the pipe fitting 1 extends to the rolling mill head 31. When the purging device includes a base 26 and a first connecting rod 211, the base 26 is arranged on the front guide sleeve bracket assembly 32, and the first connecting rod 211 is located on the side of the front guide sleeve bracket assembly 32 close to the rolling mill head 31.

[0064] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described equipment, devices and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0065] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A purging device for a rolling mill, wherein a pipe is installed on the rolling mill, characterized in that: The purging device includes an axially extendable telescopic component and a blow pipe component, wherein the blow pipe component is arranged at one end of the telescopic component, and the other end of the telescopic component is rotatably arranged inside the rolling mill so that the blow pipe component is close to or away from the pipe.

2. The purging device according to claim 1, characterized in that: The telescopic assembly includes a first connecting rod and a second connecting rod, one end of the first connecting rod can be rotatably arranged inside the rolling mill, the blow pipe assembly is arranged at one end of the second connecting rod, and a first telescopic structure for circumferential relative rotation is constructed between the other end of the first connecting rod and the other end of the second connecting rod so that one end of the first connecting rod is close to or away from one end of the second connecting rod.

3. The purging device according to claim 2, characterized in that: The first telescopic structure includes a first axial extension rod constructed at the other end of the first connecting rod and a first axial insertion hole arranged at the other end of the second connecting rod; the first axial extension rod is inserted into the first axial insertion hole, the outer wall of the first axial extension rod is configured with a first external thread, and the inner wall of the first axial insertion hole is configured with a second internal thread matching the first external thread.

4. The purging device according to claim 2, characterized in that: The first telescopic structure includes a second axial extension rod constructed at the other end of the second connecting rod and a second axial insertion hole arranged at the other end of the first connecting rod; the second axial extension rod is inserted into the second axial insertion hole, the outer wall of the second axial extension rod is constructed with a second external thread, and the inner wall of the second axial insertion hole is constructed with a second internal thread matching the second external thread.

5. The purging device according to claim 2, characterized in that: The purging device also includes a cartridge tube rotatably arranged at one end of the second connecting rod, the axis of the cartridge tube and the axis of the second connecting rod form a preset angle, the preset angle is greater than 0° and less than 90°, and the blow pipe assembly is inserted into the cartridge tube.

6. The purging device according to claim 5, characterized in that: The inner wall of the insert tube is configured with an internal thread, and the outer wall of the blowpipe assembly is configured with an external thread; and / or the preset angle is 90°.

7. The purging device according to claim 5, characterized in that: The outer wall of the insertion tube is configured with a connection portion extending toward the second connecting rod, an end of the connection portion away from the insertion tube is configured with an insertion shaft, and one end of the second connecting rod is configured with a third axial insertion hole for inserting the insertion shaft.

8. The purging device according to claim 2, characterized in that: The purging device further comprises a third connecting rod, which is connected to the rolling mill and rotatably connected to one end of the first connecting rod.

9. The purging device according to claim 8, characterized in that: The purge device also includes a rotating shaft, a first chord section is constructed on the side wall of the third connecting rod near one end of the first connecting rod, a first through hole is opened at the first chord section, a second chord section is constructed on the side wall of the first connecting rod near one end of the third connecting rod, a second through hole is opened at the second chord section, the first chord section is abutted against the second chord section, and the rotating shaft is passed through the first through hole and the second through hole.

10. The purging device according to claim 8, characterized in that: The purging device also includes a base, which is detachably arranged inside the rolling mill. The end of the third connecting rod away from the first connecting rod is rotatably inserted into the side wall of the base, and when rotating, one end of the first connecting rod can be moved closer to or away from the base.

11. The purging device according to claim 1, characterized in that: The blowpipe assembly comprises an air inlet end and an air outlet end, wherein the air inlet end is connected to the air delivery pipe, the air outlet end faces the pipe fitting, and the air outlet end gradually shrinks in the air outlet direction.

12. A rolling mill, characterized in that: The rolling mill includes a rolling mill head, a leading guide sleeve bracket assembly and a purging device according to any one of claims 1 to 11, a pipe fitting is installed on the guide sleeve bracket assembly, and the pipe fitting extends to the rolling mill head. When the purging device includes a base and a first connecting rod, the base is arranged on the leading guide sleeve bracket assembly, and the first connecting rod is located on the side of the leading guide sleeve bracket assembly close to the rolling mill head.

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