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

Abstract

The invention discloses a sealing structure for a roller shaft extending end of a roller box of a cantilever 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 present invention belongs to the technical field of metallurgical long product production equipment, and specifically relates to a sealing structure of a cantilever rolling mill roll box of metallurgical long product production equipment, and more particularly to a sealing structure of a roll shaft extension end of a cantilever rolling mill roll box. Background Art

[0002] The cantilever rolling mill roll box is an important equipment for the production of metallurgical long products. The operating conditions are relatively complex, and the performance of the sealing structure at the extended end of the roll shaft is particularly important. Generally, a rubber-steel ring composite seal is used. The working surface is double-sided sealed. The external seal prevents the entry of turbid cooling water and pollutants, and the internal seal prevents the leakage of lubricating oil. Figure 1 As shown, when the equipment is running, a large amount of cooling water is required for forced cooling from the outside. At the same time, the rolled material continues to shed oxide powder during processing, and the seal and the sealing ring are always in a state of relative rotational friction, which puts the working environment of the sealing structure in a harsh state. The sealing structure is single and direct, and the external isolation object is in direct contact with the seal, which can easily cause contact surface wear. The relatively fixed operating friction position aggravates the wear of the working surface, resulting in a shortened service life of the seal. Seals often fail in the short term or unexpectedly. Seal failure will cause a large amount of water and pollutants to enter the equipment, which will have an adverse effect on the internal components and lubricating oil of the equipment, resulting in equipment failure shutdown and excessive consumption of spare parts. Figure 2 As shown, the sealing structure of the prior art involves many installation parts, which increases the risk of water ingress, and there are many disassembly and assembly parts and consumable parts during maintenance and replacement, which reduces the maintenance efficiency of the equipment and increases the consumption of spare parts.

[0003] The utility model patent with the authorization announcement number CN221374460U and the authorization announcement date of July 19, 2024 discloses "a sealing fixing device for improving the maintenance efficiency of the roller box line" (hereinafter referred to as the cited document). The sealing structure of the cited document is as follows: Figure 3-Figure 7As shown, it includes a retaining frame 4 and a double-lip sealing ring 3 installed on the inner ring of the retaining frame 4, the inner ring of the retaining frame 4 is provided with a first step groove 41 opened from top to bottom; the double-lip sealing ring 3 includes a double-lip rubber ring 5 and a skeleton ring 6, the skeleton ring 6 is arranged in the middle position of the outer ring of the double-lip rubber ring 5, and the outer ring of the skeleton ring 6 is provided with a second step groove 61 opened from bottom to top, and the second step groove 61 cooperates with the first step groove 41. The specification of the cited document discloses in paragraph

[0024] : "By adopting the above technical solution, the double-lip seal ring 3 of the utility model is connected with the first step groove 41 of the retaining frame 4 through the second step groove 61 of the skeleton ring 6. When installing, it is only necessary to insert the double-lip seal ring 3 into the retaining frame 4, and then evenly press the upper surface of the skeleton ring 6 to make the bottom surface of the second step groove 61 fit with the top surface of the first step groove 41. When checking, it is only necessary to check the degree of fit between the two to determine whether the installation is qualified. When disassembling, it is only necessary to evenly lift the double-lip seal ring 3 with a flat knife. When replacing the double-lip seal ring 3, the utility model does not need to disassemble the retaining frame 4, so that impurities can be ensured not to enter the roller box, thereby improving the service life of the roller box, and no special tools are required during installation, which makes the installation simpler, and the inspection method after installation is simple, thereby improving the replacement efficiency of the double-lip seal ring 3". In addition, paragraph

[0025] also discloses: "Specifically, an annular groove 51 is provided in the middle position of the outer ring of the double-lip rubber ring 5". The double-lip seal ring 3 is first installed inside the retainer 4, and the retainer 4 is installed on the eccentric bearing sleeve. The outer circle of the retainer 4 is compressed and matched with the external mounting part through the O-ring to form a sealing contact. The outer lip edge of the double-lip seal ring 3 contacts the outer oil slinger 1 to form the second sealing position. The structure is complex, involving many mounting parts, and it is easy to cause many hidden dangers of water leakage and failure, which reduces the maintenance and replacement efficiency. There are many wearing parts and increase the cost. When using and replacing, the retainer needs bolts, combined sealing gaskets, sealing rings and other mounting fixtures, and a third sealing position appears. There are many locations that need to be sealed, and the security of preventing water ingress will be greatly reduced. In addition, the use of adjustment makes the retainer relative to the outer diameter mounting part position need to be frequently rotated to increase the hidden danger points of water ingress. The sealing ring is fixed in the retainer and the working friction position of the oil slinger is relatively fixed, which accelerates wear and shortens the service life of the seal. The sealing structure is single and the direct sealing security is poor. Summary of the invention

[0004] The purpose of the present invention is to provide a sealing structure for the extended end of a cantilever rolling mill roll box roll shaft, which has the advantages of few related parts, convenient replacement and maintenance, low use cost, long service life and good sealing security.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

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

[0007] Furthermore, a hole groove leading to the outside is provided inside the sealing mounting plate, and the external working medium is introduced into the cavity (114) formed by the upper sealing ring, the sealing member and the sealing mounting plate through the hole groove; and a gap is provided between the upper sealing ring and the sealing mounting plate.

[0008] Furthermore, the working medium is compressed air, a mixture of lubricating oil and compressed air, or clean circulating cooling water.

[0009] Furthermore, the working medium is compressed air or a mixture of lubricating oil and compressed air.

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

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

[0012] Furthermore, the double-sided magnetic sealing working surfaces are connected in a magnetic suspension sheet form.

[0013] Furthermore, the double-sided magnetic sealing working surface adopts a double-sided magnetic capsule cavity structure, and the sealing component is provided with a channel connected to the hole groove and the double-sided magnetic capsule cavity structure, and the working medium is introduced into the double-sided magnetic capsule cavity structure through the hole groove and the channel.

[0014] Furthermore, the double-sided magnetic sealing working surface adopts a double-sided magnetic capsule cavity structure, and the sealing component is provided with a channel connected to the hole groove and the double-sided magnetic capsule cavity structure, and the working medium is introduced into the double-sided magnetic capsule cavity structure through the hole groove and the channel.

[0015] Furthermore, the sealing member is made of rubber material, and has an upper and lower double-sided outward-turned sealing edge structure.

[0016] The seal is made of rubber material and adopts an upper and lower bidirectional expansion bladder structure. A channel connected to the hole groove and the bidirectional expansion bladder structure is provided in the seal. The working medium is introduced into the bidirectional expansion bladder structure through the hole groove and the channel.

[0017] The seal is made of rubber material and adopts an upper and lower bidirectional expansion bladder structure. A channel connected to the hole groove and the bidirectional expansion bladder structure is provided in the seal. The working medium is introduced into the bidirectional expansion bladder structure through the hole groove and the channel.

[0018] An annular groove is provided in the middle of the upper working surface of the seal, and a through hole connected to the magnetic capsule cavity structure is provided in the annular groove. The compressed air or the mixed gas of lubricating oil and compressed air in the magnetic capsule cavity structure is introduced into the upper sealing ring and the upper working surface of the seal through the through hole.

[0019] An annular groove is provided in the middle of the upper working surface of the seal, and a through hole connected to the expansion bladder structure is provided in the annular groove. The compressed air or the mixed gas of lubricating oil and compressed air in the expansion bladder structure is introduced into the upper sealing ring and the upper working surface of the seal through the through hole.

[0020] The beneficial effects of the present invention relative to the prior art are:

[0021] 1. In the present invention, the seal is installed on the seal installation plate, and the upper and lower working surfaces of the seal are in contact with the working surfaces of the upper sealing ring and the lower sealing ring respectively to achieve sealing. Therefore, there is only one sealing position, which greatly reduces the hidden danger of water ingress, and introduces the external working medium into the cavity formed by the upper sealing ring, the seal, and the seal installation plate, forming a positive pressure to separate it from the outside, and adding a guarantee seal.

[0022] 2. The present invention achieves the purpose of involving fewer related parts, convenient replacement and maintenance, low use cost, long service life and good sealing guarantee. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0025] Figure 1 and Figure 2 The names and reference numerals of the components involved are as follows:

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

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

[0028] Figure 4It is a sealing structure of cited documents in the background technology Figure 2 ;

[0029] Figure 5 It is a sealing structure of cited documents in the background technology Figure 3 ;

[0030] Figure 6 It is a sealing structure of cited documents in the background technology Figure 4 ;

[0031] Figure 7 It is a sealing structure of cited documents in the background technology Figure 5 ;

[0032] Figure 3-Figure 7 The names and reference numerals of the components involved are as follows:

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

[0034] Figure 8 It is a schematic diagram of the sealing structure of the extended end of the roll shaft of the cantilever rolling mill roll box of the present invention;

[0035] Fig. 9 yes Figure 8 A local enlarged view of point A;

[0036] Fig.10 It is a schematic diagram of the relative changes in the positions of the seal and the upper and lower sealing rings, where: Fig.10 (a) is a diagram showing the relative position change between the seal and the upper and lower sealing rings. Figure 1 , Fig.10 (b) is a diagram showing the relative position change between the seal and the upper and lower sealing rings. Figure 2 ;

[0037] Fig.11 This is a schematic diagram of the main view of the hole groove inside the sealing mounting plate;

[0038] Fig.12 yes Fig.11 Left view of;

[0039] Fig.13 Schematic diagram of the working medium entering the cavity;

[0040] Fig.14 It is a schematic diagram of the connection form of the double-sided magnetic suspension;

[0041] Fig.15 It is a schematic diagram of a double-sided magnetic capsule structure;

[0042] Fig.16 It is a schematic diagram of an upper and lower bidirectional expansion bladder structure;

[0043] Fig.17 It is a schematic diagram of the introduction of working medium into the working surface of the double-sided magnetic capsule structure;

[0044] Fig.18 It is a schematic diagram of the introduction of working medium into the working surface of the upper and lower bidirectional expansion bladder structure.

[0045] Figure 8-Figure 18 The names and reference numerals of the components involved are summarized as follows:

[0046] Panel 101, sealing mounting plate 102, sealing member 103, upper sealing ring 104, lower sealing ring 105, eccentric bushing 106, roller shaft 107, shoulder hole 108, hole groove 112, working medium 113, cavity 114, magnetic suspension sheet 115, magnetic capsule structure 116, outward-turned sealing edge structure 117, and expansion capsule structure 118. DETAILED DESCRIPTION

[0047] like Figure 8 , Fig. 9 As shown, this embodiment discloses a cantilever rolling mill roll box roll shaft extension end sealing structure, including a panel 101, a sealing mounting plate 102, a sealing member 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, and the panel 101 is mounted on the roller box 119 (see Figure 1 ), a shoulder hole 108 is provided on the sealing mounting plate 102, and the shoulder of the shoulder hole 108 is a stopper, and the lower sealing ring 105 and the upper sealing ring 104 are fixed on the roll shaft 107, and the roll shaft 107 is rotatably mounted in the inner hole of the eccentric sleeve 106 (an oil film bearing is installed between the eccentric sleeve 106 and the roll shaft 107, and the oil film bearing and the roll shaft 107 are clearance-matched, and they rotate relatively during operation. The oil film bearing and the inner hole of the eccentric sleeve 106 are interference-fitted, and the eccentric sleeve 106 is only responsible for the radial positioning of the roll shaft 107. The two roll shafts 10 7 has a maximum center distance of 234mm and a minimum center distance of 205mm. The structure here and the structure involved in the relative rotation of the eccentric sleeve 106 and the roller shaft 107 are all mature technologies. The eccentric sleeve 106 is mounted in the 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 stopper. The upper and lower working surfaces of the seal 103 are respectively in contact with the working surfaces of the upper sealing ring 104 and the lower sealing ring 105 to achieve sealing.

[0049] The entire sealing structure involves fewer installation parts, which is conducive to maintenance, improves operating efficiency, reduces potential water ingress points, and reduces spare parts consumption. Fig.10As shown, when in use, as the eccentric sleeve 106 rotates to adjust the relative position of the seal 103 and the upper sealing ring 104 and the lower sealing ring 105, the positions change within the maximum and minimum adjustment range of the roller shaft 107, and the working positions of the upper sealing ring 104 and the lower sealing ring 105 change from the original fixed single annular area (such as Fig.10 (a)) to the entire changing area (as shown in Fig.10 (b) shows), the working surface is expanded and the wear position is constantly changed, thereby extending the service life of the seal 103.

[0050] Since the relevant installation parts are reduced, the seal 103 is directly installed on the seal installation plate 102, 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 achieve sealing. This technical solution has only one sealing position, which greatly reduces the hidden danger of water ingress and enhances the reliability of the use of the sealing structure. In addition, there are fewer installation parts, which improves the accuracy of the cumulative tolerance of the assembly, and is more convenient and easy to operate during the initial assembly adjustment and daily maintenance and replacement on the production line, which improves work efficiency, reduces the difficulty of adjustment and maintenance, and further enhances the security and reliability of the sealing structure.

[0051] Further, such as Fig.11 , Fig.12 As shown, the sealing mounting plate 102 is provided with a hole groove 112 leading to the outside, and the cross-sectional shape of the hole groove 112 has no effect on the realization of the basic function. The external working medium 113 is introduced into the cavity 114 formed by the upper sealing ring 104, the sealing member 103 and the sealing mounting plate 102 through the hole groove 112; a gap is provided between the upper sealing ring 104 and the sealing mounting plate 102.

[0052] like Fig.13 As shown, the working medium that forms positive pressure in the cavity 114 is ejected from the gap between the upper sealing ring 104 and the sealing mounting plate 102 to add a seal, blocking the external partition outside the cavity 114, ensuring that the seal 103 does not directly contact the pollutants and is not disturbed. The introduction of the working medium 113 can also quickly take away the heat generated by the friction of the seal 103 to provide a cooling effect, ensuring that the working environment of the seal 103 is good and stable, thereby further enhancing the security of the sealing structure and extending the service life of the seal 103.

[0053] Furthermore, the working medium 113 may be compressed air, a mixture of lubricating oil and compressed air, or clean circulating cooling water, etc.

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

[0055] Furthermore, the upper and lower working surfaces of the seal 103 are upper and lower double-sided magnetic sealing working surfaces (ie, magnetic sealing means that both the upper and lower working surfaces of the seal 103 are provided with permanent magnets).

[0056] Further, such as Fig.14 As shown, the double-sided magnetic sealing working surface adopts a magnetic suspension sheet 115 connection form.

[0057] Further, such as Fig.15 As shown, the double-sided magnetic seal working surface adopts a double-sided magnetic capsule structure 116, and a channel connected to the hole groove 112 and the double-sided magnetic capsule structure is provided in the seal 103, and the working medium 113 is introduced into the double-sided magnetic capsule structure 116 through the hole groove 112 and the channel. The positive pressure of the working medium 113 is used to ensure the pressing force of the friction surface, and cooling is provided inside the magnetic capsule structure 116, so as to further improve the sealing performance and life.

[0058] Further, such as Fig.13 As shown, the sealing member 103 is made of rubber, and the sealing member 103 adopts an upper and lower double-sided outward-turned sealing edge structure 117 .

[0059] Further, such as Fig.16 As shown, the seal 103 is made of rubber, and the seal 103 adopts an upper and lower bidirectional expansion bladder structure 118. A channel connected to the hole groove 112 and the bidirectional expansion bladder structure 118 is provided in the seal 103, and the working medium 113 is introduced into the bidirectional expansion bladder structure 118 through the hole groove 112 and the channel. The positive pressure of the working medium 113 is used to ensure the pressing force of the friction surface, and cooling is provided inside the bidirectional expansion bladder structure 118, so as to further improve the sealing performance and life.

[0060] In addition, the sealing member 103 may be made of a rubber-steel composite member in addition to the above-mentioned materials and structures.

[0061] Further, such as Fig.17 As shown, an annular groove is provided in the middle of the upper working surface of the seal 103, and a through hole connected to the magnetic capsule cavity structure 116 is provided in the annular groove. The compressed air or the mixed gas of lubricating oil and compressed air in the magnetic capsule cavity structure 116 is introduced into the upper sealing ring 104 and the upper working surface of the seal 103 through the through hole.

[0062] Further, such as Fig.18 As shown, an annular groove is provided in the middle of the upper working surface of the seal 103, and a through hole connected to the expansion bladder structure 118 is provided in the annular groove. The compressed air or the mixed gas of lubricating oil and compressed air in the expansion bladder structure 118 is introduced into the upper sealing ring 104 and the upper working surface of the seal 103 through the through hole.

[0063] Fig.17 and Fig.18 In the embodiment, the cross-sectional shape of the annular groove and the shape, direction and connection form of the through hole have no effect on the effect. The compressed air or the mixed gas of lubricating oil and compressed air is introduced into the annular cavity formed by the upper sealing ring 104 and the upper working surface of the sealing member 103. The compressed air or the mixed gas of lubricating oil and compressed air also forms a positive pressure in the annular cavity, which adds another seal and can further enhance the security of the seal. When the equipment is running, as the upper sealing ring 104 and the sealing member 103 rotate at a relatively high speed, the compressed air or the mixed gas of lubricating oil and compressed air will form a protective film of compressed air or oil-gas mixed gas on the friction surface, which plays a role in local lubrication and cooling, further enhancing the sealing effect and extending the service life.

[0064] When in use, the seal 103, the upper sealing ring 104 and the lower sealing ring 105 change within the working range, and the continuous change expands the working surface, extending the service life of the seal 103. The entire sealing structure involves fewer installation parts, which is conducive to maintenance, improves operating efficiency, reduces water ingress risk points, and reduces spare parts consumption.

[0065] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cantilever rolling mill roll box roll shaft extension end sealing structure, characterized in that: The invention comprises a panel (101), a sealing installation plate (102), a sealing member (103), an upper sealing ring (104), a lower sealing ring (105) and an eccentric shaft sleeve (106); the sealing installation plate (102) is installed on the panel (101); a shoulder hole (108) is provided on the sealing installation plate (102); the shoulder of the shoulder hole (108) is a stopper; the lower sealing ring (105) and the upper sealing ring (104) are installed and fixed on a roller shaft (107) The roller shaft (107) is rotatably mounted in the inner hole of the eccentric shaft sleeve (106), the eccentric shaft sleeve (106) is matched with the shaft sleeve mounting hole on the panel (101), the sealing member (103) is mounted in the shoulder hole (108) of the sealing mounting plate (102) and matched with the inner wall of the shoulder hole (108) and the stopper, and the upper and lower working surfaces of the sealing member (103) are respectively in contact with the working surfaces of the upper sealing ring (104) and the lower sealing ring (105) to achieve sealing.

2. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 1 is characterized in that: The sealing installation plate (102) is provided with a hole groove (112) leading to the outside, and an external working medium (113) is introduced into a cavity (114) formed by an upper sealing ring (104), a sealing member (103) and the sealing installation plate (102) through the hole groove (112); a gap is provided between the upper sealing ring (104) and the sealing installation plate (102).

3. The sealing structure for the extended end of the roll shaft of the cantilever rolling mill roll box according to claim 2 is characterized in that: The working medium (113) is compressed air, a mixed gas of lubricating oil and compressed air, or clean circulating cooling water.

4. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 2, characterized in that: The working medium (113) is compressed air or a mixture of lubricating oil and compressed air.

5. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 3, characterized in that: The upper and lower working surfaces of the sealing element (103) are upper and lower double-sided magnetic sealing working surfaces.

6. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 4, characterized in that: The upper and lower working surfaces of the sealing element (103) are upper and lower double-sided magnetic sealing working surfaces.

7. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 5, characterized in that: The double-sided magnetic sealing working surface adopts a magnetic suspension sheet (115) connection form.

8. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 5, characterized in that: The double-sided magnetic sealing working surface adopts a double-sided magnetic capsule cavity structure (116), and the sealing component (103) is provided with a channel connected to the hole groove (112) and the double-sided magnetic capsule cavity structure, and the working medium (113) is introduced into the double-sided magnetic capsule cavity structure (116) through the hole groove (112) and the channel.

9. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 6, characterized in that: The double-sided magnetic sealing working surface adopts a double-sided magnetic capsule cavity structure (116), and the sealing component (103) is provided with a channel connected to the hole groove (112) and the double-sided magnetic capsule cavity structure, and the working medium (113) is introduced into the double-sided magnetic capsule cavity structure (116) through the hole groove (112) and the channel.

10. The sealing structure for the roll shaft extension end of the cantilever rolling mill roll box according to any one of claims 1 to 3, characterized in that: The sealing member (103) is made of rubber material, and the sealing member (103) adopts an upper and lower double-sided outward-turned sealing edge structure (117).

11. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 3, characterized in that: The sealing member (103) is made of rubber. The sealing member (103) adopts an upper and lower bidirectional expansion bladder structure (118). A channel communicating with the hole groove (112) and the bidirectional expansion bladder structure (118) is provided in the sealing member (103). The working medium (113) is introduced into the bidirectional expansion bladder structure (118) through the hole groove (112) and the channel.

12. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 4, characterized in that: The sealing member (103) is made of rubber. The sealing member (103) adopts an upper and lower bidirectional expansion bladder structure (118). A channel communicating with the hole groove (112) and the bidirectional expansion bladder structure (118) is provided in the sealing member (103). The working medium (113) is introduced into the bidirectional expansion bladder structure (118) through the hole groove (112) and the channel.

13. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 9, characterized in that: An annular groove is provided in the middle of the upper working surface of the sealing member (103), and a through hole connected to the magnetic capsule cavity structure (116) is provided in the annular groove, and compressed air or a mixed gas of lubricating oil and compressed air in the magnetic capsule cavity structure (116) is introduced into the upper sealing ring (104) and the upper working surface of the sealing member (103) through the through hole.

14. The cantilever rolling mill roll box roll shaft extension end sealing structure according to claim 12, characterized in that: An annular groove is provided in the middle of the upper working surface of the sealing member (103), and a through hole connected to the expansion bladder structure (118) is provided in the annular groove. The compressed air or the mixed gas of lubricating oil and compressed air in the expansion bladder structure (118) is introduced into the upper sealing ring (104) and the upper working surface of the sealing member (103) through the through hole.

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