Sealing structure for extending end of roller shaft of roller box of cantilever rolling mill

Abstract

The utility model discloses a sealing structure for a roller shaft extending end of a roller box of a cantilever rolling mill, and belongs to the technical field of metallurgical long material production equipment. The sealing device comprises a panel, a sealing mounting plate, a sealing piece, an upper side sealing ring, a lower side sealing ring and an eccentric shaft sleeve, the sealing installation plate is installed on the panel, a shoulder of a shoulder hole of the sealing installation plate is a stop table, the upper side sealing ring and the lower side sealing ring are fixedly installed on the roller shaft, the roller shaft is rotationally installed in an inner hole of the eccentric shaft sleeve, the outer circle of the eccentric shaft sleeve is installed in an installation hole of the panel in a matched mode, and the sealing piece is matched with the inner wall of the shoulder hole and the stop table. And the upper and lower working surfaces of the sealing element are contacted with the working surfaces of the upper and lower sealing rings to realize sealing. During use, the sealing element, the upper sealing ring and the lower sealing ring change in the working range, the working face is expanded through continuous change, and the service life of the sealing element is prolonged. The whole sealing structure is provided with few installation parts, maintenance is facilitated, operation efficiency is improved, water inlet hidden danger points are reduced, and spare part consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to metallurgical long material production equipment technical field, concretely relates to a sealing structure of cantilever rolling mill roll box of metallurgical long material production equipment, and especially relates to a sealing structure of cantilever rolling mill roll box roll shaft extension end. BACKGROUND

[0002] Cantilever rolling mill roll box is important equipment of metallurgical long material production, and the working condition of operation is relatively complex, and the performance of the sealing structure of the roll shaft extension end is particularly important. Generally, rubber steel ring composite sealing element is adopted, the working surface is double-sided sealing, the external sealing prevents the entry of cooling water and pollutants, and the internal sealing prevents the leakage of lubricating oil. As shown in Figure 1 , a large amount of cooling water is needed for forced cooling when the equipment is running, and the rolled material continuously falls off the oxide skin powder along with the processing, and the sealing element and the sealing ring are always in a relative rotating friction state, which makes the working environment of the sealing structure in a poor state. The sealing structure is single and direct, the external isolator directly contacts the sealing element, which easily causes the wear of the contact surface, the relatively fixed running friction position aggravates the wear of the working surface, and the service life of the sealing element is shortened. The sealing often fails in a short term or unpredictably, and the sealing failure will cause a large amount of water and pollutants to enter the equipment, which has an adverse effect on the internal parts and lubricating oil of the equipment, produces equipment failure downtime and excessive consumption of spare parts, and the like. As shown in Figure 2 , the sealing structure of the prior art involves many installation parts, increases the hidden danger of water entering, and has many disassembling parts and consumed parts during maintenance and replacement, reduces the maintenance efficiency of the equipment, and increases the consumption of spare parts.

[0003] The utility model discloses a "sealing fixing device for improving roll box line maintenance efficiency" (hereinafter referred to as the cited document) in the practical new type patent with the authorization announcement number CN221374460U and the authorization announcement date of July 19, 2024, and the sealing structure of the cited document is as shown in Figures 3-7As shown, including the holder 4 and installed in the inner ring of holder 4 double lip seal ring 3, the inner ring of holder 4 is provided with the first step groove 41 opened from top to bottom; Double lip seal ring 3 includes double lip rubber ring 5 and skeleton ring 6, skeleton ring 6 is arranged at the middle position of the outer circle of double lip rubber ring 5, the outer circle of skeleton ring 6 is provided with the second step groove 61 opened from bottom to top, and the second step groove 61 is matched with the first step groove 41. The description of the cited document discloses in paragraph

[0024] : through the above technical scheme, the double lip seal ring 3 is connected with the first step groove 41 of the holder 4 through the second step groove 61 of the skeleton ring 6, only needs to be inserted into the holder 4 during installation, and then the upper surface of the skeleton ring 6 is pressed uniformly, so that the bottom surface of the second step groove 61 is attached to the top surface of the first step groove 41, and the installation is qualified when the attachment degree of the two is checked, and the double lip seal ring 3 is lifted uniformly through a straight knife during disassembly, so that the holder 4 does not need to be disassembled when the double lip seal ring 3 is replaced, so that the service life of the roller box is improved, and the installation is more simple, the checking method after installation is simple, and the replacement efficiency of the double lip seal ring 3 is improved. In addition, paragraph

[0025] also discloses: specifically, the middle position of the outer circle of double lip rubber ring 5 is provided with a ring groove 51. The double lip seal ring 3 is first installed in the holder 4, the holder 4 is installed on the eccentric bearing sleeve, the outer circle of the holder 4 is compressed and matched with the external mounting member through the O-shaped sealing ring to form a sealed contact, the outer lip of the double lip seal ring 3 is in contact with the outer oil throwing ring 1 to form a second sealing position, the structure is complex, many installation members are involved, and many water leakage failure hidden troubles are caused, the maintenance and replacement efficiency is reduced, many vulnerable parts are caused, and the cost is increased. When the holder is used and replaced, bolts, combined sealing gaskets, sealing rings and other installation fixing members appear, and a third sealing position appears. The more the positions that need to be sealed, the lower the water prevention security will be. And the use of adjustment makes the holder relative to the outer diameter mounting member position need to be rotated frequently, which increases the hidden trouble point of water entering. The sealing ring is fixed in the holder and is relatively fixed with the working friction position of the oil throwing ring, which accelerates the wear and tear, shortens the service period of the sealing member, the sealing structure form is single, and the direct sealing security is poor. Utility model content

[0004] The utility model discloses a kind of sealing structures related to less components, replacement maintenance is convenient, low in use cost, long in use period, and good in sealing security.

[0005] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0006] A cantilever rolling mill roll box roll shaft extension end sealing structure, comprising a panel, a sealing mounting plate, a sealing element, an upper side sealing ring, a lower side sealing ring and an eccentric shaft sleeve; the sealing mounting plate is mounted on the panel, the sealing mounting plate is provided with a shoulder hole, the shoulder of the shoulder hole is a stop shoulder, the lower side sealing ring and the upper side sealing ring are mounted and fixed on the roll shaft, the roll shaft is rotatably mounted in the inner hole of the eccentric shaft sleeve, the eccentric shaft sleeve is fittedly mounted in the shaft sleeve mounting hole on the panel, the sealing element is mounted in the shoulder hole of the sealing mounting plate and cooperates with the inner wall of the shoulder hole and the stop shoulder, and the upper and lower working surfaces of the sealing element respectively contact the working surfaces of the upper side sealing ring and the lower side sealing ring to realize sealing.

[0007] Further, the sealing mounting plate is internally provided with a hole groove communicating with the outside, and the working medium is introduced into the cavity (114) formed by the upper side sealing ring, the sealing element and the sealing mounting plate through the hole groove; a gap is provided between the upper side sealing ring and the sealing mounting plate.

[0008] Further, the working medium is compressed air, lubricating oil and compressed air mixed gas or pure ring cooling water.

[0009] Further, the working medium is compressed air or lubricating oil and compressed air mixed gas.

[0010] Further, the upper and lower working surfaces of the sealing element are upper and lower double-sided magnetic sealing working surfaces.

[0011] Further, the upper and lower working surfaces of the sealing element are upper and lower double-sided magnetic sealing working surfaces.

[0012] Further, the double-sided magnetic sealing working surface adopts a magnetic suspension piece connection form.

[0013] Further, the double-sided magnetic sealing working surface adopts a double-sided magnetic capsule cavity structure, the sealing element is internally provided with a hole channel communicating with the hole groove and the double-sided magnetic capsule cavity structure, and the working medium is introduced into the inside of the double-sided magnetic capsule cavity structure through the hole groove and the hole channel.

[0014] Further, the double-sided magnetic sealing working surface adopts a double-sided magnetic capsule cavity structure, the sealing element is internally provided with a hole channel communicating with the hole groove and the double-sided magnetic capsule cavity structure, and the working medium is introduced into the inside of the double-sided magnetic capsule cavity structure through the hole groove and the hole channel.

[0015] Further, the sealing element is made of rubber material and adopts an upper and lower double-sided outward turning sealing edge structure.

[0016] The sealing element is made of rubber material and adopts an upper and lower double-sided outward turning sealing edge structure.

[0017] The sealing member is made of rubber material, adopts a double-direction expansion bag structure, and is internally provided with a hole communicating with the hole groove and the double-direction expansion bag structure.

[0018] The upper working surface of the sealing member is provided with a ring groove in the middle, and the ring groove is provided with a through hole communicating with the magnetic force bag cavity structure.

[0019] The upper working surface of the sealing member is provided with a ring groove in the middle, and the ring groove is provided with a through hole communicating with the expansion bag structure.

[0020] The beneficial effects of the present application are as follows:

[0021] 1. The sealing member is installed on the sealing installation plate, and the upper and lower working surfaces of the sealing member are in contact with the working surfaces of the upper sealing ring and the lower sealing ring to realize sealing. Therefore, there is only one sealing position, which greatly reduces the risk of water entering, and the external working medium is introduced into the cavity formed by the upper sealing ring, the sealing member and the sealing installation plate, thereby forming a positive pressure and being separated from the outside, and a sealing protection is added.

[0022] 2. The present application has the advantages of fewer related parts, convenient replacement and maintenance, low use cost, long use cycle and good sealing protection. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of a roller box assembly of the prior art;

[0024] Figure 2 It is a sealing structure diagram of the prior art;

[0025] Figure 1 And Figure 2 The component names and reference signs involved in the present application are as follows:

[0026] Panel 101, sealing installation plate 102, sealing member 103, upper sealing ring 104, lower sealing ring 105, eccentric shaft sleeve 106, roller shaft 107, sealing ring 109, second sealing plate 110, cooling water pipe 111, roller box body 119.

[0027] Figure 3 It is a sealing structure of the cited document in the background art Figure 1 ;

[0028] Figure 4Is the document sealing structure cited in the background art Figure 2 ;

[0029] Figure 5 Is the document sealing structure cited in the background art Figure 3 ;

[0030] Figure 6 Is the document sealing structure cited in the background art Figure 4 ;

[0031] Figure 7 Is the document sealing structure cited in the background art Figure 5 ;

[0032] Figures 3-7 The component names and reference signs involved in the background art are as follows:

[0033] Double-lip sealing ring 3, retainer 4, first step groove 41, double-lip rubber ring 5, ring groove 51, skeleton ring 6, second step groove 61.

[0034] Figure 8 Is the schematic diagram of the sealing structure of the cantilever rolling mill roll box roll shaft extension end of the utility model;

[0035] Figure 9 Is Figure 8 the enlarged view of A of the utility model;

[0036] Figure 10 Is the schematic diagram of the relative position change of the sealing element and the upper and lower sealing rings, wherein: Figure 10 (a) is a schematic diagram of the relative position change of the sealing element and the upper and lower sealing rings Figure 1 , Figure 10 (b) is a schematic diagram of the relative position change of the sealing element and the upper and lower sealing rings Figure 2 ;

[0037] Figure 11 Is the main view schematic diagram of the internal hole groove of the sealing installation plate;

[0038] Figure 12 Is Figure 11 the left view;

[0039] Figure 13 Is the schematic diagram of the working medium into the cavity;

[0040] Figure 14 Is the schematic diagram of the double-sided magnetic suspension connection form;

[0041] Figure 15 Is the schematic diagram of the double-sided magnetic force capsule cavity structure;

[0042] Figure 16 Is the schematic diagram of the up-down bidirectional expansion capsule structure;

[0043] Figure 17 is a schematic diagram of a double-sided magnetic capsule structure working medium introduction working surface;

[0044] Figure 18 is a schematic diagram of an up-down bidirectional expansion capsule structure working medium introduction working surface.

[0045] Figures 8-18 The component names and reference signs involved in the present application are as follows:

[0046] Panel 101, sealing mounting plate 102, seal 103, upper sealing ring 104, lower sealing ring 105, eccentric shaft sleeve 106, roll shaft 107, shoulder hole 108, hole groove 112, working medium 113, cavity 114, magnetic suspension 115, magnetic capsule structure 116, everted sealing edge structure 117, expansion capsule structure 118. DETAILED DESCRIPTION

[0047] As shown in Figure 8 , Figure 9 , the present embodiment discloses a cantilever rolling mill roll box roll shaft extension end sealing structure, which comprises a panel 101, a sealing mounting plate 102, a seal 103, an upper sealing ring 104, a lower sealing ring 105, and an eccentric shaft sleeve 106.

[0048] The sealing mounting plate 102 is mounted on the panel 101, the panel 101 is mounted on the roll box body 119 (see Figure 1 ), the sealing mounting plate 102 is provided with a shoulder hole 108, the shoulder of the shoulder hole 108 is a stop shoulder, the lower sealing ring 105 and the upper sealing ring 104 are mounted and fixed on the roll shaft 107, the roll shaft 107 is rotatably mounted in the inner hole of the eccentric shaft sleeve 106 (an oil film bearing is mounted between the eccentric shaft sleeve 106 and the roll shaft 107, the oil film bearing is in clearance fit with the roll shaft 107, and the oil film bearing rotates relatively during operation. The oil film bearing is in interference fit with the inner hole of the eccentric shaft sleeve 106, and the eccentric shaft sleeve 106 is only responsible for the radial positioning of the roll shaft 107. The maximum center distance between the two roll shafts 107 is 234 mm, and the minimum center distance is 205 mm. The structure here and the structure involved in the relative rotation of the eccentric shaft sleeve 106 and the roll shaft 107 are all mature technologies), the eccentric shaft sleeve 106 is fitted and mounted in the shaft sleeve mounting hole provided on the panel 101, the seal 103 is mounted in the shoulder hole 108 of the sealing mounting plate 102 and cooperates with the inner wall of the shoulder hole 108 and the stop shoulder, and the upper and lower working surfaces of the seal 103 are in contact with the working surfaces of the upper sealing ring 104 and the lower sealing ring 105 respectively to realize sealing.

[0049] The entire sealing structure involves few mounting parts, which is conducive to maintenance, improves operation efficiency, reduces water entry hidden trouble points, and reduces spare part consumption. As Figure 10As shown, the position of the sealing element 103 relative to the upper sealing ring 104 and the lower sealing ring 105 changes with the rotation of the eccentric sleeve 106 during use, and the working position of the upper sealing ring 104 and the lower sealing ring 105 changes within the maximum and minimum range of adjustment of the roll shaft 107, from the original fixed single annular area (as shown in Figure 10 (a)) to the entire variable area (as shown in Figure 10 (b)), which expands the working surface and constantly changes the wear position, thereby prolonging the service life of the sealing element 103.

[0050] Since the number of related installation components is reduced, the sealing element 103 is directly installed on the sealing mounting plate 102, and the upper and lower working surfaces of the sealing element 103 are in contact with the working surfaces of the upper sealing ring 104 and the lower sealing ring 105 to achieve sealing. The sealing position of this technical solution is only one, which greatly reduces the risk of water entering and enhances the reliability of the sealing structure. Moreover, the number of installation components is reduced, which improves the cumulative tolerance accuracy of assembly, makes the first assembly adjustment and routine maintenance and replacement on the production line more convenient and easy to operate, improves work efficiency, reduces adjustment and maintenance difficulty, and further enhances the security and reliability of the sealing structure.

[0051] Further, as shown in Figure 11 , Figure 12 The sealing mounting plate 102 is provided with a hole slot 112 that is open to the outside, and the cross-sectional shape of the hole slot 112 has no effect on the basic function. The hole slot 112 is used to introduce the external working medium 113 into the cavity 114 formed by the upper sealing ring 104, the sealing element 103, and the sealing mounting plate 102; and a gap is provided between the upper sealing ring 104 and the sealing mounting plate 102.

[0052] As shown in Figure 13 The working medium that forms a positive pressure in the cavity 114 is ejected from the gap between the upper sealing ring 104 and the sealing mounting plate 102 to increase a sealing, which blocks the external barrier outside the cavity 114 and ensures that the sealing element 103 is not directly in contact with contaminants and is not disturbed. The introduction of the working medium 113 can also quickly remove the heat generated by the friction of the sealing element 103 to provide a cooling effect, ensuring a good and stable working environment for the sealing element 103, thereby further enhancing the security of the sealing structure and prolonging the service life of the sealing element 103.

[0053] Further, the working medium 113 can be compressed air, lubricating oil and compressed air mixture, or clean cooling water.

[0054] Further, the working medium 113 can be compressed air or a mixture of lubricating oil and compressed air.

[0055] Further, the upper and lower working surfaces of the sealing member 103 are upper and lower double-sided magnetic force sealing working surfaces (i.e. the magnetic force sealing refers to that the upper and lower working surfaces of the sealing member 103 are provided with permanent magnets).

[0056] Further, as shown in Figure 14 the double-sided magnetic force sealing working surfaces adopt a magnetic force suspension piece 115 connection form.

[0057] Further, as shown in Figure 15 the double-sided magnetic force sealing working surfaces adopt a double-sided magnetic force capsule cavity structure 116, the sealing member 103 is provided with a hole channel which is in communication with the hole groove 112 and the double-sided magnetic force capsule cavity structure, and the working medium 113 is introduced into the inside of the double-sided magnetic force capsule cavity structure 116 through the hole groove 112 and the hole channel. The normal pressure of the working medium 113 is used to ensure the compression force of the friction surface, and cooling is provided in the inside of the double-sided magnetic force capsule cavity structure 116, so as to further improve the sealing performance and service life.

[0058] Further, as shown in Figure 13 the sealing member 103 is made of rubber, and the sealing member 103 adopts an upper and lower double-sided everted sealing edge structure 117.

[0059] Further, as shown in Figure 16 the sealing member 103 is made of rubber, and the sealing member 103 adopts an upper and lower double-directional expansion capsule structure 118, the sealing member 103 is provided with a hole channel which is in communication with the hole groove 112 and the double-directional expansion capsule structure 118, and the working medium 113 is introduced into the inside of the double-directional expansion capsule structure 118 through the hole groove 112 and the hole channel. The normal pressure of the working medium 113 is used to ensure the compression force of the friction surface, and cooling is provided in the inside of the double-directional expansion capsule structure 118, so as to further improve the sealing performance and service life.

[0060] In addition, the sealing member 103 can also adopt a rubber steel frame composite part in addition to the above-mentioned materials and structures.

[0061] Further, as shown in Figure 17 the upper side working surface of the sealing member 103 is provided with a ring groove in the middle part, and the ring groove is provided with a through hole which is in communication with the magnetic force capsule cavity structure 116, and the compressed air or the mixed gas of lubricating oil and compressed air in the magnetic force capsule cavity structure 116 is introduced into the position of the upper side sealing ring 104 and the upper side working surface of the sealing member 103 through the through hole.

[0062] Further, as shown in Figure 18 the upper side working surface of the sealing member 103 is provided with a ring groove in the middle part, and the ring groove is provided with a through hole which is in communication with the expansion capsule structure 118, and the compressed air or the mixed gas of lubricating oil and compressed air in the expansion capsule structure 118 is introduced into the position of the upper side sealing ring 104 and the upper side working surface of the sealing member 103 through the through hole.

[0063] Figure 17 and Figure 18 Among them, the ring groove cross-sectional shape and the hole shape, direction and communication form have no effect on the implementation effect, the compressed air or the lubricating oil and the compressed air mixed gas is introduced into the annular cavity position formed by the upper side sealing ring 104 and the upper side working surface of the sealing element 103, the compressed air or the lubricating oil and the compressed air mixed gas in the annular cavity also forms a positive pressure and increases a sealing, which can further enhance the security of the sealing. When the equipment is running, with the relative high-speed rotation of the upper side sealing ring 104 and the sealing element 103, the compressed air or the oil and gas mixed gas protection film will be formed on the friction surface, which plays a local lubrication and cooling effect, further enhances the sealing effect and prolongs the service life.

[0064] When in use, the sealing element 103 changes with the upper side sealing ring 104 and the lower side sealing ring 105 in the working range, which constantly changes and expands the working surface, prolongs the service life of the sealing element 103. The whole sealing structure involves few installation elements, which is beneficial to maintenance, improves the operation efficiency, reduces the hidden danger of water inlet and reduces the consumption of spare parts.

[0065] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the application concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A cantilevered roll mill roll housing roll shaft extension end seal structure, characterized by: The utility model relates to a sealing device for the rolling mill, which comprises a panel (101), a sealing mounting plate (102), a sealing element (103), an upper sealing ring (104), a lower sealing ring (105) and an eccentric shaft sleeve (106); the sealing mounting plate (102) is mounted on the panel (101), and a shoulder hole (108) is arranged on the sealing mounting plate (102), wherein the shoulder of the shoulder hole (108) is a stop shoulder; the lower sealing ring (105) and the upper sealing ring (104) are fixedly mounted on a rolling mill shaft (107), the rolling mill shaft (107) is rotatably arranged in the inner hole of the eccentric shaft sleeve (106), the eccentric shaft sleeve (106) is fittedly arranged in a shaft sleeve mounting hole on the panel (101), the sealing element (103) is arranged in the shoulder hole (108) of the sealing mounting plate (102) and cooperates with the inner wall of the shoulder hole (108) and the stop shoulder, and the upper and lower working surfaces of the sealing element (103) respectively contact the working surfaces of the upper sealing ring (104) and the lower sealing ring (105) to realize sealing.

2. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 1, wherein: The sealing mounting plate (102) is internally provided with a hole groove (112) that is communicated with the outside, and the working medium (113) outside is introduced into a cavity (114) formed by the upper sealing ring (104), the sealing element (103) and the sealing mounting plate (102) through the hole groove (112); a gap is arranged between the upper sealing ring (104) and the sealing mounting plate (102).

3. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 2, wherein: The working medium (113) is compressed air, lubricating oil, compressed air and lubricating oil mixture or pure cooling water.

4. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 2, wherein: The working medium (113) is compressed air or compressed air and lubricating oil mixture.

5. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 3, wherein: The upper and lower working surfaces of the sealing element (103) are upper and lower double-sided magnetic force sealing working surfaces.

6. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 4, wherein: The upper and lower working surfaces of the sealing element (103) are upper and lower double-sided magnetic force sealing working surfaces.

7. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 5, wherein: The double-sided magnetic force sealing working surface adopts a magnetic force suspension piece (115) connection form.

8. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 5, wherein: The double-sided magnetic force sealing working surface adopts a double-sided magnetic force capsule cavity structure (116), the sealing element (103) is internally provided with a hole channel that is communicated with the hole groove (112) and the double-sided magnetic force capsule cavity structure, and the working medium (113) is introduced into the inside of the double-sided magnetic force capsule cavity structure (116) through the hole groove (112) and the hole channel.

9. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 6, wherein: The double-sided magnetic force sealing working surface adopts a double-sided magnetic force capsule cavity structure (116), the sealing element (103) is internally provided with a hole channel that is communicated with the hole groove (112) and the double-sided magnetic force capsule cavity structure, and the working medium (113) is introduced into the inside of the double-sided magnetic force capsule cavity structure (116) through the hole groove (112) and the hole channel.

10. The cantilevered roll mill roll chock roll shaft extension end seal structure of any one of claims 1-3, characterized by: The sealing element (103) is made of rubber material and adopts an upper and lower double-sided outward turning sealing edge structure (117).

11. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 3, wherein: The sealing element (103) is made of rubber material and adopts an upper and lower double-sided outward turning sealing edge structure (117).

12. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 4, wherein: The sealing member (103) is made of rubber, and the sealing member (103) adopts an upper and lower expansion bag type structure (118), the sealing member (103) is internally provided with a hole channel communicated with the hole groove (112) and the expansion bag type structure (118), and the working medium (113) is introduced into the expansion bag type structure (118) through the hole groove (112) and the hole channel.

13. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 9, wherein: The upper side working surface of the sealing member (103) is provided with a ring groove in the middle, the ring groove is provided with a through hole communicated with the magnetic force bag cavity structure (116), and the compressed air or the mixed gas of lubricating oil and compressed air in the magnetic force bag cavity structure (116) is introduced into the upper side sealing ring (104) and the upper side working surface position of the sealing member (103) through the through hole.

14. The cantilevered roll mill roll chock roll shaft extension end seal structure of claim 12, wherein: The upper side working surface of the sealing member (103) is provided with a ring groove in the middle, the ring groove is provided with a through hole communicated with the expansion bag type structure (118), and the compressed air or the mixed gas of lubricating oil and compressed air in the expansion bag type structure (118) is introduced into the upper side sealing ring (104) and the upper side working surface position of the sealing member (103) through the through hole.

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