Comprehensive sealing structure of high-speed wire rolling mill and use method of comprehensive sealing structure

Abstract

The invention discloses a comprehensive sealing structure of a high-speed wire rolling mill, which is arranged between a roll collar and a roll box of the high-speed wire rolling mill, and the roll collar is coaxially arranged on a roll shaft of the high-speed wire rolling mill; the sealing structure comprises an upper sliding ring and a lower sliding ring, the upper sliding ring and the lower sliding ring are arranged in an up-down attached mode and coaxially installed on the outer side of the roller shaft, and after the upper sliding ring and the lower sliding ring are attached, the vertical section forms a C-shaped containing part. The sealing retainer is arranged on the outer side of the C-shaped accommodating part and is provided with a protruding part, and the protruding part extends into the C-shaped accommodating part; and the upper slip ring, the lower slip ring and the sealing retainer form an embedded labyrinth seal. According to the sealing structure, the straight-through type labyrinth seal and the embedded type labyrinth seal are matched for use, so that the flowing resistance of fluid is increased, and meanwhile, the sealing effect of the sealing structure is improved to the maximum extent through the compressed air body and the special lubricating grease.

Description

Technical Field

[0001] The invention relates to the field of rolling mill seals, and in particular to a high-speed wire rolling mill comprehensive seal structure and a use method thereof. Background Art

[0002] In the prior art, the sealing structure of the high-speed wire rolling mill roll neck uses a double-frame lip seal installed back to back. The lip of the seal is in close contact with the ceramic-plated shaft bushing of the roll shaft and maintains a certain amount of elastic deformation. A cavity with a height of about 3mm is left between the two seals. Oil and gas are passed through the cavity for lubrication and cooling between the seal and the shaft sleeve; the lower lip seal is installed inside the connecting sleeve, and the upper seal is installed inside the sealing end cover. The upper sealing end cover can be easily replaced during daily maintenance and repair to ensure the normal operation of the system. The sealing end cover cooperates with the roller ring retainer of the upper fixed roller ring to form a labyrinth-shaped external seal.

[0003] However, the existing labyrinth seal can only barely form two small chambers, and the resistance coefficient to water is too small. When the lip seal is worn, a large amount of water mixed with the iron oxide particles produced during rolling will enter the roller box and be brought into the lubrication system, causing a large amount of filter element consumption in the lubrication station, and easily causing oil emulsification, seriously affecting equipment operation. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a comprehensive sealing structure for a high-wire rolling mill and a method of using the same. While meeting the requirements of on-site equipment such as roller rings, sealing end covers, and roller ring adjustment ranges, it is possible to consider increasing the number of labyrinths and improving the key dimensions of the labyrinth to further enhance the labyrinth sealing effect.

[0005] According to one aspect of the present invention, a high-speed wire rolling mill integrated sealing structure is provided, wherein the sealing structure is arranged between a roll ring and a roll box of the high-speed wire rolling mill, and the roll ring is coaxially mounted on a roll shaft of the high-speed wire rolling mill;

[0006] The sealing structure comprises an upper sliding ring, a lower sliding ring and a sealing retainer, wherein the upper sliding ring and the lower sliding ring are arranged in a vertically contacting manner and are coaxially installed on the outer side of the roller shaft, and the vertical section of the upper sliding ring and the lower sliding ring form a C-shaped receiving portion after the upper sliding ring and the lower sliding ring are contacted with each other, and the sealing retainer is located between the upper sliding ring and the lower sliding ring.

[0007] A sealing retainer, the sealing retainer is arranged outside the C-shaped receiving portion and is provided with a protrusion, the protrusion extending into the C-shaped receiving portion;

[0008] The upper sliding ring is provided with a plurality of labyrinth grooves 1 connected to the C-shaped receiving portion, the protrusion forms a plurality of barrier portions 1 extending into the labyrinth groove 1, the protrusion forms a sealing groove 2 inwardly, and the lower sliding ring forms a barrier portion 2 extending into the sealing groove 2 outwardly;

[0009] The upper sliding ring, the lower sliding ring and the sealing retainer form a multi-engraved labyrinth seal.

[0010] Among them, the upper slip ring is arranged on the side of the roll shaft close to the roll ring, and the lower slip ring is arranged on the side of the roll shaft close to the roll box. During operation, the roll shaft rotates, and the upper slip ring and the lower slip ring rotate together. The blocking part 1 cooperates with the labyrinth groove 1, and the blocking part 2 cooperates with the sealing groove 2 to form a more complex labyrinth path, thereby increasing the flow resistance of the fluid.

[0011] The seal retainer and the lower slide ring are provided with a plurality of straight-through seal grooves to form a straight-through labyrinth seal.

[0012] The straight-through labyrinth seal and the interlocking labyrinth seal work together to increase the resistance of the fluid flow by increasing the resistance coefficient of water, thereby reducing leakage and further improving the sealing effect.

[0013] As a further technical solution, the upper slip ring is arranged on the side of the roll shaft close to the roll ring, and the lower slip ring is arranged on the side of the roll shaft close to the roll box.

[0014] As a further technical solution, the upper sliding ring is provided with a seal 1 on one side close to the roller shaft, and the lower sliding ring is provided with a seal 2 on one side close to the roller shaft. By providing the seal 1 and the seal 2, and the seal 1 and the seal 2 are conventionally known annular rubber seals, the sealing effect can be further improved.

[0015] As a further technical solution, a lip seal is provided in the C-shaped receiving portion, which fits the protruding portion on the seal holder, and its two ends are respectively in contact with the upper sliding ring and the lower sliding ring. The lip seal is an open petal shape similar to lips, which can not only prevent external water, iron filings, etc. from entering the roller box to damage the parts, but also prevent the lubricating oil inside the roller box from leaking to the outside of the roller box.

[0016] As a further technical solution, a filling part is formed between the sealing retainer and the upper sliding ring for applying high temperature resistant grease. Applying high temperature resistant grease in the filling part can maximize the resistance coefficient of the sealing structure, greatly reduce the amount of water and slag entering, and will not be melted by the heat generated by the labyrinth during the high-speed operation of the equipment, so that the use efficiency of the labyrinth seal can be better.

[0017] As a further technical solution, the protrusion is provided with a plurality of air holes 1, the sealing retainer is provided with a compressed air passage extending into the protrusion, the two ends of the air hole 1 are respectively connected to the compressed air passage and the outside, and the protrusion is also provided with air hole 2, the two ends of the air hole 2 are respectively connected to the compressed air passage and the C-shaped receiving part. Connecting the air hole 1 with compressed air to perform positive pressure purge on the outer interface of the lower part of the roller ring can greatly reduce the water inflow inside the labyrinth seal, and the air hole 2 is connected to the C-shaped receiving part, forming a higher pressure inside it than outside, which can increase the resistance coefficient of the seal and improve the use effect of the comprehensive seal.

[0018] As a further technical solution, a plurality of straight-through sealing grooves are respectively provided on the opposite back sides of a pair of barrier parts 1 and one side of barrier part 2. The provision of the straight-through sealing grooves can cooperate with the interlocking labyrinth seal to form a more complex sealing path, thereby increasing the resistance to fluid flow and reducing leakage, thereby further improving the sealing effect.

[0019] According to one aspect of the present invention, a method for using a high-speed wire rolling mill integrated sealing structure is provided, comprising the following steps:

[0020] S1. Based on the resistance coefficients of the mosaic labyrinth seal and the straight labyrinth seal, set the main dimensions of the mosaic labyrinth seal and the straight labyrinth seal, wherein the main dimensions at least include the length of the labyrinth chamber, the width of the labyrinth chamber and the width of the labyrinth gap. Before working, apply high temperature resistant grease in the seal holder;

[0021] S2. When the equipment is running, the roller rotates, driving the upper sliding ring and the lower sliding ring on the outside to rotate in the sealing retainer;

[0022] S3, the upper sliding ring, the lower sliding ring and the sealing retainer form a mosaic labyrinth seal, and the straight-through sealing groove forms a straight-through labyrinth seal, and the two sets of labyrinth seals cooperate with each other;

[0023] S4. Multiple air holes on the seal holder are connected to compressed air to perform positive pressure blowing on the outer interface of the lower part of the roller ring to reduce the amount of water entering the labyrinth seal. Air hole 2 is connected to the C-shaped receiving part to form a higher pressure than the external pressure inside the C-shaped receiving part to increase the resistance coefficient of the seal.

[0024] As a further technical solution, the resistance coefficient of the mosaic labyrinth seal is calculated as follows:

[0025] Assume b0=0.6mm, s=5mm, I=1.5mm;

[0026] Calculation of the free flow width b in a mosaic labyrinth seal r , b r=2.4as+b0, where a is the structural coefficient of the fluid flow, s is the length of the labyrinth chamber in the mosaic labyrinth seal, and b0 is the width of the labyrinth gap;

[0027] Compare I with b r , where I is the width of the small chamber in the mosaic labyrinth seal;

[0028] If I<b r , then the resistance coefficient of the mosaic labyrinth seal Ф2=1.5 (1-b0 / I) 2 .

[0029] As a further technical solution, the resistance coefficient of the straight-through labyrinth seal is calculated as follows:

[0030] Assume b0=0.6mm, s1=3mm, I1=1mm;

[0031] Calculation of the free flow width b in a straight-through labyrinth seal r1 , b r1 =2.4as1+b0, where a is the structural coefficient of the fluid flow, s1 is the length of the labyrinth chamber in the straight-through labyrinth seal, and b0 is the width of the labyrinth gap;

[0032] Compare I1 with b r1 , where I1 is the width of the small chamber in the straight-through labyrinth seal;

[0033] If I1 r1 , then the resistance coefficient of the straight-through labyrinth seal Ф4=1.5 (1-b0 / I1) 2 .

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention arranges the upper slip ring on the side of the roll shaft close to the roll ring, and the lower slip ring on the side of the roll shaft close to the roll box. When working, the roll shaft rotates, the upper slip ring and the lower slip ring rotate together, the barrier part 1 cooperates with the labyrinth groove 1, and the barrier part 2 cooperates with the sealing groove 2 to form a more complex labyrinth path, thereby increasing the flow resistance of the fluid. The straight-through labyrinth seal and the interlocking labyrinth seal cooperate with each other to increase the resistance coefficient of water to increase the resistance of the fluid flow, thereby reducing the leakage, thereby further improving the sealing effect.

[0036] 2. The present invention can greatly reduce the amount of water and slag entering by applying high-temperature resistant grease in the filling part, and the grease will not be melted by the heat generated by the labyrinth during the high-speed operation of the equipment, thereby making the labyrinth seal more effective.

[0037] ​3. The present invention connects the air hole 1 to the compressed air to perform positive pressure blowing on the outer interface of the lower part of the roller ring, which can greatly reduce the amount of water entering the labyrinth seal. The air hole 2 is connected to the C-shaped accommodating part, and a pressure higher than the external pressure is formed inside it, which can increase the resistance coefficient of the seal and enhance the use effect of the comprehensive seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings used in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A structural schematic diagram of a high-speed wire rolling mill comprehensive sealing structure and a method of using the same provided in an embodiment of the present invention.

[0040] Figure 2 A schematic diagram of the positional relationship of a labyrinth groove 1 and a barrier part 1 of a high-wire rolling mill comprehensive sealing structure and a method of using the same provided in an embodiment of the present invention.

[0041] Figure 3 A schematic diagram of the positional relationship between a barrier portion 2 and a sealing groove 2 of a high-speed wire rolling mill comprehensive sealing structure and a method of using the same provided in an embodiment of the present invention.

[0042] In the figure: 1. roller box; 2. roller shaft; 3. roller ring; 4. sealing structure; 401. upper sliding ring; 402. lower sliding ring; 403. C-shaped accommodating part; 404. sealing retaining frame; 405. protrusion; 406. labyrinth groove one; 407. barrier part one; 408. sealing groove two; 409. barrier part two; 410. seal one; 411. seal two; 412. lip seal; 413. straight-through sealing groove; 414. filling part; 4151. air hole one; 4152. air hole two; 416. compressed air channel. DETAILED DESCRIPTION

[0043] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions, for example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to the steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the technical features in the various embodiments or single embodiments provided by the present invention are arbitrarily combined with each other to form a new technical solution. This combination is not restricted by the sequence of steps and / or the structural composition mode, but must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that this combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] See also Figure 1-3 An embodiment of the present invention provides a comprehensive sealing structure for a high-speed wire rolling mill, comprising: a roll shaft 2 passing through a roll box 1, a roll ring 3 coaxially installed on the roll shaft 2, and a sealing structure 4 arranged between the roll ring 3 and the roll box 1 to reduce the possibility that iron oxide particles generated during a large amount of water-mixed rolling will enter the roll box 1.

[0046] In this embodiment, the sealing structure 4 includes an upper sliding ring 401, a lower sliding ring 402 and a sealing holder 404. The upper sliding ring 401, the lower sliding ring 402 and the sealing holder 404 form a multi-engaged labyrinth seal to improve the sealing effect.

[0047] Specifically, the upper sliding ring 401 and the lower sliding ring 402 are arranged to fit together and are coaxially installed to the outer side of the rolling roller shaft 2. After the two are fitted together, the vertical cross-section forms a C-shaped accommodating portion 403, and the sealing retaining frame 404 is located between the two. The sealing retaining frame 404 is arranged on the outer side of the C-shaped accommodating portion 403, and is provided with a protrusion 405. The protrusion 405 extends into the C-shaped accommodating portion 403. The upper sliding ring 401 is provided with a plurality of labyrinth grooves 406 connected to the C-shaped accommodating portion 403, and the protrusion 405 forms a plurality of barrier portions 407 extending into the labyrinth groove 406 outwardly, and the protrusion 405 forms a sealing groove 408 inwardly, and the lower sliding ring 402 forms a barrier portion 409 extending into the sealing groove 408 outward.

[0048] Among them, the upper slip ring 401 is arranged on the side of the roll shaft 2 close to the roll ring 3, and the lower slip ring 402 is arranged on the side of the roll shaft 2 close to the roll box 1. During operation, the roll shaft 2 rotates, and the upper slip ring 401 and the lower slip ring 402 rotate together, the blocking part 1 407 cooperates with the labyrinth groove 1 406, and the blocking part 2 409 cooperates with the sealing groove 2 408 to form a more complex labyrinth path, thereby increasing the flow resistance of the fluid.

[0049] In this embodiment, a sealing member 1 410 is provided on a side of the upper sliding ring 401 close to the roller shaft 2 , and a sealing member 2 411 is provided on a side of the lower sliding ring 402 close to the roller shaft 2 .

[0050] By providing a seal 1 410 and a seal 2 411 , and the seal 1 410 and the seal 2 411 are conventionally known annular rubber seals, the sealing effect can be further improved.

[0051] In this embodiment, a lip seal 412 is disposed in the C-shaped receiving portion 403 and is in contact with the protruding portion 405 on the seal holder 404 , and two ends of the lip seal 412 are respectively in contact with the upper sliding ring 401 and the lower sliding ring 402 .

[0052] The lip seal 412 is an open petal shape similar to lips, which can not only prevent external water, iron filings, etc. from entering the roller box 1 to damage parts, but also prevent the lubricating oil inside the roller box 1 from leaking to the outside of the roller box 1.

[0053] In this embodiment, a plurality of straight-through sealing grooves 413 are provided on the sealing retainer 404 and the lower sliding ring 402 to form a plurality of straight-through labyrinth seals to increase the water resistance coefficient.

[0054] The straight-through labyrinth seal and the interlocking labyrinth seal work together to increase the resistance of the fluid flow by increasing the resistance coefficient of water, thereby reducing leakage and further improving the sealing effect.

[0055] In this embodiment, a filling portion 414 is formed between the sealing retainer 404 and the upper sliding ring 401 , and high temperature resistant grease is applied inside the filling portion 414 .

[0056] Applying high temperature resistant grease in the filling part 414 can greatly reduce the amount of water and slag entering. The grease will not be melted by the heat generated by the labyrinth during the high-speed operation of the equipment, which can make the labyrinth seal more effective.

[0057] In this embodiment, a plurality of air holes 4151 are provided on the protrusion 405, a compressed air passage 416 extending into the protrusion 405 is provided on the sealing retaining frame 404, and both ends of the air hole 4151 are respectively connected to the compressed air passage 416 and the outside, and an air hole 4152 is further provided on the protrusion 405, and both ends of the air hole 4152 are respectively connected to the compressed air passage 416 and the C-shaped accommodating portion 403.

[0058] Connecting compressed air to the air hole 1 4151 to perform positive pressure purge on the outer interface of the lower part of the roller ring 3 can greatly reduce the amount of water entering the labyrinth seal and improve the use effect of the comprehensive seal. The air hole 2 4152 is connected to the C-shaped receiving part 403, and a higher pressure than the outside can be formed inside it, which can increase the resistance coefficient of the seal.

[0059] In this embodiment, a plurality of straight-through sealing grooves 413 are respectively opened on opposite sides of a pair of barrier portions 1 407 and one side of barrier portion 2 409 .

[0060] The straight-through sealing groove 413 can cooperate with the interlocking labyrinth seal to form a more complex sealing path, thereby increasing the resistance to fluid flow and reducing leakage, thereby further improving the sealing effect.

[0061] An embodiment of the present invention provides a method for using a high-speed wire rolling mill integrated sealing structure, comprising the following steps:

[0062] S1. Based on the resistance coefficients of the mosaic labyrinth seal and the straight labyrinth seal, set the main dimensions of the mosaic labyrinth seal and the straight labyrinth seal. The main dimensions include at least the length of the labyrinth chamber, the width of the labyrinth chamber and the width of the labyrinth gap. Before working, apply high temperature resistant grease in the seal holder 404.

[0063] S2, when the equipment is running, the roller shaft 2 rotates, driving the upper sliding ring 401 and the lower sliding ring 402 on the outer side thereof to rotate in the sealing holder 404;

[0064] S3, the upper sliding ring 401, the lower sliding ring 402 and the sealing retainer 404 form a mosaic labyrinth seal, and the straight-through sealing groove 413 forms a straight-through labyrinth seal, and the two sets of labyrinth seals cooperate with each other;

[0065] S4. Multiple air holes 4151 on the seal holder 404 are connected to compressed air to perform positive pressure blowing on the lower outer interface of the roller ring 3 to reduce the amount of water entering the labyrinth seal. Air hole 2 4152 is connected to the C-shaped accommodating portion 403 to form a pressure higher than the external pressure inside the C-shaped accommodating portion 403 to increase the resistance coefficient of the seal.

[0066] It should be noted that the labyrinth seal has its own unique characteristics. Water leaking from the high-pressure side enters the expansion chamber through the gap throttling point. The water pressure energy is converted into kinetic energy, the pressure drops rapidly, and the kinetic energy is dissipated as heat energy in the expansion chamber through vortices and friction generated in the flow. The kinetic energy is reduced and does not recover to pressure energy. Then, part of the leaked water with reduced pressure and flow rate enters the next expansion chamber through the next throttling point, and the water pressure and flow rate are reduced again. Through repeated throttling and expansion processes, the pressure and flow rate of the water leaking on the high-pressure side are reduced to the lowest, thus playing a sealing role.

[0067] The calculation of labyrinth seal before improvement is as follows:

[0068] The existing rolling mill sealing structure adopts double-frame lip seals installed back to back. The lip of the seal is in close contact with the ceramic-plated shaft bushing of the rolling roller shaft and maintains a certain amount of elastic deformation. A cavity with a height of about 3mm is left between the two seals. Oil and gas are passed through the cavity for lubrication and cooling between the seal and the shaft sleeve; the lower lip seal is installed inside the connecting sleeve, and the upper seal is installed inside the sealing end cover. The upper sealing end cover can be easily replaced during daily maintenance and repair to ensure the normal operation of the system. The sealing end cover cooperates with the roller ring retainer of the upper fixed roller ring to form a labyrinth-shaped external seal.

[0069] Among them, the calculation method of the resistance coefficient of the maze to water is as follows:

[0070] b r It represents the width of free flow in labyrinth seal, s represents the length of labyrinth chamber, a represents the structural coefficient of liquid flow, which is taken as 0.09 in labyrinth calculation; b0 represents the width of labyrinth gap, and I represents the width of chamber.

[0071] b r =2.4as+b0;

[0072] After on-site measurement, s=4.5mm, b0=0.75mm, I=4.0mm;

[0073] b r =1.77; I=4.0, I>b r ;

[0074] Resistance coefficient Ф1=0.0287s / b0=0.172;

[0075] Calculated based on two small chambers, the total resistance coefficient of the two chambers is Ф=2Ф1=0.344. If the resistance coefficient is too small, when the lip seal is worn, a large amount of water mixed with the iron oxide particles produced during rolling will enter the roller box and be brought into the lubrication system, causing a large amount of consumption of the filter element of the lubrication station, and easily causing oil emulsification, seriously affecting equipment operation.

[0076] The resistance coefficient of the above-mentioned labyrinth seal to water is too small, and the labyrinth can barely form two small chambers. Under the condition of meeting the requirements of on-site equipment such as roller rings, sealing end covers, and roller ring adjustment range, it is possible to consider increasing the number of labyrinths and improving the key dimensions of the labyrinth formation to further enhance the effect of the labyrinth seal, and it is possible to consider changing the original structural type of the seal.

[0077] The design and calculation method of the improved mosaic labyrinth seal are as follows:

[0078] According to the structural characteristics of Morgan's 6th generation high-speed wire mill and actual on-site measurements, the labyrinth gap width b0 can be reduced from 0.75mm to 0.6mm, which can still ensure the normal operation of the roll shaft without interference. At the same time, the width I of the small chamber can be reduced to 1.5mm while ensuring the adjustment margin of the roll ring, which can also increase the water resistance coefficient.

[0079] The calculation is as follows:

[0080] b0=0.6mm, s=5mm, I=1.5mm;

[0081] Calculation of the free flow width b in a mosaic labyrinth seal r , b r =2.4as+b0=1.68;

[0082] Where a is the structural coefficient of the liquid flow, b is r is the width of the free flow in the mosaic labyrinth seal, s is the length of the labyrinth chamber in the mosaic labyrinth seal, and b0 is the width of the labyrinth gap;

[0083] Compare I with b r , where I is the width of the small chamber in the mosaic labyrinth seal;

[0084] When I=1.5 r ;

[0085] Then the resistance coefficient of the mosaic labyrinth seal is Ф2=1.5 (1-b0 / I) 2 =1.5 (1-0.6 / 1.5) 2 =0.54;

[0086] There are 4 small chambers in total, so the total resistance coefficient of the mosaic labyrinth seal of the 4 small chambers is Φ3=4×0.54=2.16.

[0087] The design and calculation methods of straight-through labyrinth seal are as follows:

[0088] ​Huang Shoulong and others in China applied a method combining numerical simulation and experiment to study the influence of cavity tendency, cavity shape, cavity size and medium flow direction on sealing efficiency of straight-through labyrinth seal. He pointed out: With the increase of inlet and outlet pressure ratio of labyrinth structure, leakage begins to increase rapidly and then gradually tends to a constant value; when other structural parameters remain unchanged, leakage changes with the change of relative thickness of tooth tip and there is a minimum value, which mainly occurs in the case of thick teeth; increasing the number of teeth within a certain range can reduce leakage, but the effect is not obvious when exceeding a certain number of teeth, that is, under a given total length of the structure, there is an optimal number of teeth or cavity width that minimizes leakage; when other structural parameters remain unchanged, leakage increases with the increase of the ratio of gap to cavity width: excessively deepening the cavity cannot improve the sealing performance of the labyrinth, and there is an optimal cavity depth-to-width ratio that minimizes leakage.

[0089] After analysis, it is believed that the use of rectangular grooves is conducive to processing. The gap width of the maze has been determined to be 0.6mm. Referring to the calculation results of the flow field of the straight-through rectangular maze groove simulated by FLUENT software: when the maze gap is 0.6mm, according to the depth of the sealing end cover and considering the convenience of processing and the principle of a more reasonable position and structural relationship of the components at the sealing end cover, the depth of the rectangular groove is 1mm and the width is 3mm. A total of 3 rectangular grooves are processed on the sealing end cover and the lower sliding ring.

[0090] Then calculate the resistance coefficient of the straight-through maze:

[0091] b0=0.6mm, s1=3mm, I1=1mm;

[0092] Calculation of the free flow width b in a straight-through labyrinth seal r1 , b r1 =2.4as1+b0=2.4*0.09*3+0.6=1.248;

[0093] Where a is the structural coefficient of the liquid flow, b is r1 is the width of the free flow in the straight-through labyrinth seal, s1 is the length of the labyrinth chamber in the straight-through labyrinth seal, and b0 is the width of the labyrinth gap;

[0094] Compare I1 with b r1 , where I1 is the width of the small chamber in the straight-through labyrinth seal;

[0095] When I1=1 r1 ; Then the resistance coefficient of the straight-through maze Ф4=1.5 (1-b0 / I1) 2 =1.5 (1-0.6 / 1) 2 =0.24, a total of 3 straight-through seals can be set, then the total resistance coefficient of the 3 straight-through labyrinths is Ф5=3*Ф4=0.72; ​

[0096] The sum of the resistance coefficients of the four interlocking labyrinths and three straight labyrinths used in the sealing structure of this device is Φ 总 =Ф3+Ф5=2.88.

[0097] Therefore, the resistance coefficient of the new labyrinth seal can reach 2.88, which is much higher than the original design. It greatly reduces the rolling water and iron oxide scale entering the position where the lip seal is located, and can greatly reduce the amount of water and slag entering. Since the rolls are at a 45-degree angle to the horizontal plane on site, the sealing end cover is parallel to the roll axis and also at a 45-degree angle to the horizontal plane. During the design, it is ensured that the lowest point of the lip seal is also 6mm higher than the lowest point of the sealing end cover, so as to ensure that a small amount of water entering the labyrinth seal can flow out smoothly under the action of gravity, ensuring the normal operation of the lip seal.

[0098] The filling portion 414 in the sealing retainer 404 is pre-coated with high temperature resistant grease, which can minimize the I value while ensuring the normal operation of the equipment when the equipment is running, and can maximize the sealing performance of the labyrinth seal.

[0099] Through the above analysis and calculation, the key dimensions of the labyrinth seal, such as the length of the labyrinth chamber, the width of the chamber, the width of the labyrinth gap, etc., can be accurately set, and the straight-through sealing groove is reset while ensuring convenient processing, so that the resistance coefficient of the new seal is far greater than the original design. At the same time, each time the seal is replaced, high-temperature resistant grease is applied to the filling part 414 in the seal retainer 404, which will not be melted by the heat generated by the labyrinth during the high-speed operation of the equipment, thereby making the labyrinth seal more efficient.

[0100] Six small air holes 4151 are arranged on the sealing retaining frame 404. Compressed air is connected to perform positive pressure blowing on the lower outer interface of the roller ring 3, which can greatly reduce the amount of water entering the labyrinth seal. The air hole 4152 is connected to the C-shaped accommodating part 403, and a pressure higher than the external pressure is formed inside it, which can increase the resistance coefficient of the seal and enhance the use effect of the comprehensive seal.

[0101] On the one hand, this can greatly reduce the amount of water and slag entering this area, thereby ensuring the normal operation of the equipment; on the other hand, it can ensure that even if the skirt seal is worn, the equipment can still operate normally in the short term.

[0102] In summary, the present invention can accurately set the key dimensions of the labyrinth seal, such as the length of the labyrinth chamber, the width of the labyrinth chamber, the width of the labyrinth gap, etc., through the above analysis and calculation, and re-set the straight-through sealing groove while ensuring convenient processing, so that the resistance coefficient of the new seal far exceeds the original design. At the same time, each time the seal is replaced, high-temperature resistant grease is applied to the filling part 414 in the seal retainer 404, which will not be melted by the heat generated by the labyrinth during the high-speed operation of the equipment, so that the use efficiency of the labyrinth seal can be best.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A high-speed wire rolling mill comprehensive sealing structure, characterized in that: The sealing structure (4) is arranged between a roller ring (3) and a roller box (1) of the high-speed wire rolling mill, and the roller ring (3) is coaxially mounted on a roller shaft (2) of the high-speed wire rolling mill; The sealing structure (4) comprises an upper sliding ring (401), a lower sliding ring (402) and a sealing retainer (404); the upper sliding ring (401) and the lower sliding ring (402) are arranged in a vertically aligned manner and are coaxially mounted on the outer side of the roller shaft (2); when the two are aligned, a C-shaped receiving portion (403) is formed in a vertical section, and the sealing retainer (404) is located between the two; A sealing retaining frame (404), the sealing retaining frame (404) being arranged outside the C-shaped accommodating portion (403), and being provided with a protruding portion (405), the protruding portion (405) extending into the C-shaped accommodating portion (403); The upper sliding ring (401) is provided with a plurality of labyrinth grooves (406) connected to the C-shaped receiving portion (403); the protruding portion (405) forms a plurality of barrier portions (407) extending outwardly into the labyrinth grooves (406); the protruding portion (405) forms a sealing groove (408) inwardly; and the lower sliding ring (402) forms a barrier portion (409) extending outwardly into the sealing groove (408); The upper sliding ring (401), the lower sliding ring (402) and the sealing retainer (404) form a multi-engraved labyrinth seal; The seal retainer (404) and the lower sliding ring (402) are provided with a plurality of straight-through sealing grooves (413) to form a plurality of straight-through labyrinth seals.

2. According to claim 1, a high-speed wire rolling mill comprehensive sealing structure is characterized in that: The upper slip ring (401) is arranged on a side of the roll shaft (2) close to the roll ring (3), and the lower slip ring (402) is arranged on a side of the roll shaft (2) close to the roll box (1).

3. The high-speed wire rolling mill comprehensive sealing structure according to claim 1, characterized in that: A sealing member 1 (410) is provided on a side of the upper sliding ring (401) close to the roller shaft (2), and a sealing member 2 (411) is provided on a side of the lower sliding ring (402) close to the roller shaft (2).

4. The high-speed wire rolling mill comprehensive sealing structure according to claim 1, characterized in that: A lip seal (412) is provided in the C-shaped accommodating portion (403) and is fitted with the upper protrusion (405) of the seal retaining frame (404), and its two ends are respectively abutted against the upper sliding ring (401) and the lower sliding ring (402).

5. The high-speed wire rolling mill comprehensive sealing structure according to claim 1, characterized in that: A filling portion (414) is formed between the sealing retainer (404) and the upper sliding ring (401) for applying high temperature resistant grease.

6. A high-speed wire rolling mill comprehensive sealing structure according to claim 1, characterized in that: The protrusion (405) is provided with a plurality of air holes (4151), the sealing retainer (404) is provided with a compressed air passage (416) extending into the protrusion (405), the two ends of the air hole (4151) are respectively connected to the compressed air passage (416) and the outside, the protrusion (405) is further provided with an air hole (4152), the two ends of the air hole (4152) are respectively connected to the compressed air passage (416) and the C-shaped accommodating portion (403), the air hole (4152) is connected to the C-shaped accommodating portion (403), a pressure higher than that of the outside is formed inside the air hole (4152), and the resistance coefficient of the seal is improved.

7. A high-speed wire rolling mill comprehensive sealing structure according to claim 1, characterized in that: A plurality of straight-through sealing grooves (413) are respectively opened on opposite sides of a pair of barrier portions 1 (407) and on one side of barrier portion 2 (409).

8. A method for using a comprehensive sealing structure of a high-speed wire rolling mill, characterized in that: The following steps are involved: Based on the resistance coefficients of the mosaic labyrinth seal and the straight labyrinth seal, the main dimensions of the mosaic labyrinth seal and the straight labyrinth seal are set, wherein the main dimensions at least include the length of the labyrinth chamber, the width of the labyrinth chamber and the width of the labyrinth gap. Before operation, high temperature resistant grease is applied to the seal retainer (404); When the equipment is in operation, the roller shaft (2) rotates, driving the upper sliding ring (401) and the lower sliding ring (402) on the outer side thereof to rotate in the sealing retainer (404); The upper sliding ring (401), the lower sliding ring (402) and the sealing retainer (404) form a chimeric labyrinth seal, and the straight-through sealing groove (413) forms a straight-through labyrinth seal, and the two sets of labyrinth seals cooperate with each other; The plurality of air holes (4151) on the seal retainer (404) are connected to compressed air to perform positive pressure blowing on the lower outer interface of the roller ring (3), thereby reducing the amount of water entering the labyrinth seal. The air holes (4152) are connected to the C-shaped accommodating portion (403), thereby forming a pressure higher than that of the outside, thereby increasing the resistance coefficient of the seal.

9. The method for using the comprehensive sealing structure of a high-speed wire rolling mill according to claim 8, characterized in that: The calculation method of the resistance coefficient of the mosaic labyrinth seal is as follows: Assume b0=0.6mm, s=5mm, I=1.5mm; Calculation of the free flow width b in a mosaic labyrinth seal r , b r =2.4as+b0, where a is the structural coefficient of the fluid flow, s is the length of the labyrinth chamber in the mosaic labyrinth seal, and b0 is the width of the labyrinth gap; Compare I with b r , where I is the width of the small chamber in the mosaic labyrinth seal; If I<b r , then the resistance coefficient of the mosaic labyrinth seal Ф2=1.5 (1-b0 / I) 2 .

10. The method for using the integrated sealing structure of a high-speed wire rolling mill according to claim 8, characterized in that: The drag coefficient of the straight-through labyrinth seal is calculated as follows: Assume b0=0.6mm, s1=3mm, I1=1mm; Calculation of the free flow width b in a straight-through labyrinth seal r1 , b r1 =2.4as1+b0, where a is the structural coefficient of the fluid flow, s1 is the length of the labyrinth chamber in the straight-through labyrinth seal, and b0 is the width of the labyrinth gap; Compare I1 with b r1 , where I1 is the width of the small chamber in the straight-through labyrinth seal; If I1 r1 , then the resistance coefficient of the straight-through labyrinth seal Ф4=1.5 (1-b0 / I1) 2 .​

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