A high wire rod mill integrated sealing structure and a method of using the same

Abstract

This invention discloses a comprehensive sealing structure for a high-speed wire rod mill. The sealing structure is disposed between the roll ring and the roll box of the high-speed wire rod mill, with the roll ring coaxially mounted on the roll shaft. The sealing structure includes an upper sliding ring and a lower sliding ring, which are fitted together vertically and coaxially mounted on the outside of the roll shaft, forming a C-shaped receiving portion in their vertical cross-section after fitting. A sealing retainer is disposed outside the C-shaped receiving portion and has a protrusion extending into the C-shaped receiving portion. The upper sliding ring, lower sliding ring, and sealing retainer form a mating labyrinth seal. This invention increases the flow resistance of fluid by using a combination of a straight-through labyrinth seal and a mating labyrinth seal. Simultaneously, this structure utilizes compressed air and special lubricating grease to maximize the sealing effect of the sealing structure.

Description

Technical Field

[0001] This invention relates to the field of rolling mill sealing, specifically to a comprehensive sealing structure for a high-speed wire rod mill and its application method. Background Technology

[0002] In existing technology, the sealing structure at the neck of a high-speed wire rod mill employs a double-frame lip seal installed back-to-back. The seal lips are in close contact with the ceramic-coated bushing of the roll shaft while maintaining a certain amount of elastic deformation. A cavity of approximately 3mm in height is left between the two seals, through which oil and gas are circulated for lubrication and cooling between the seal and the bushing. The lower lip seal is installed inside the connecting sleeve, while the upper seal is installed inside the sealing end cover. The upper sealing end cover can be easily replaced during routine maintenance, ensuring normal system operation. The sealing end cover and the upper fixed roll ring cage cooperate to form a labyrinth-type external seal.

[0003] However, the existing labyrinth seals can only barely form two small chambers, and the resistance coefficient to water is too small. When the lip seal wears, a large amount of water mixed with iron oxide particles generated during rolling will enter the roll box and be carried into the lubrication system, causing a large consumption of the filter element of the lubrication station and easily causing oil emulsification, which seriously affects the operation of the equipment. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a comprehensive sealing structure for a high-speed wire rod mill and its usage method. While meeting the requirements of field equipment such as roller rings, sealing end caps, and roller ring adjustment ranges, the number of labyrinths can be increased and the key dimensions for labyrinth formation can be improved to further enhance the labyrinth sealing effect.

[0005] According to one aspect of the present invention, a comprehensive sealing structure for a high-speed wire rod mill is provided, the sealing structure being disposed between the roll ring and the roll box of the high-speed wire rod mill, the roll ring being coaxially mounted on the roll shaft of the high-speed wire rod mill;

[0006] The sealing structure includes an upper sliding ring, a lower sliding ring, and a sealing retainer. The upper sliding ring and the lower sliding ring are fitted together vertically and coaxially mounted on the outside of the roll shaft. After they are fitted together, the vertical section forms a C-shaped receiving part, and the sealing retainer is located between the two.

[0007] A sealing retainer is disposed on the outside of the C-shaped receiving portion and has a protrusion that extends into the C-shaped receiving portion;

[0008] The upper sliding ring has multiple labyrinth grooves 1 that communicate with the C-shaped receiving part. The protrusion forms multiple blocking parts 1 extending outward into the labyrinth grooves 1. The protrusion forms a sealing groove 2 inward. The lower sliding ring forms a blocking part 2 extending outward into the sealing groove 2.

[0009] The upper slip ring, lower slip ring, and sealing retainer form a multi-interlocking labyrinth seal.

[0010] The upper slip ring is located on the side of the roll shaft near the roll ring, and the lower slip ring is located on the side of the roll shaft near the roll box. During operation, the roll shaft rotates, and the upper slip ring and the lower slip ring rotate together. The first blocking part cooperates with the first labyrinth groove, and the second blocking part cooperates with the second sealing groove to form a relatively complex labyrinth path, thereby increasing the flow resistance of the fluid.

[0011] The sealing retainer and the lower sliding ring are provided with multiple straight-through sealing grooves to form a straight-through labyrinth seal.

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

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

[0014] As a further technical solution, a first seal is provided on the side of the upper slip ring near the roll shaft, and a second seal is provided on the side of the lower slip ring near the roll shaft. By providing a first seal and a second seal, and since both the first and second seals are existing and known annular rubber seals, the sealing effect can be further improved.

[0015] As a further technical solution, the C-shaped receiving part is provided with a lip seal that fits against the protrusion on the sealing retainer, with its two ends abutting against the upper sliding ring and the lower sliding ring, respectively. The lip seal is shaped like a lip flap, which not only prevents external water, iron filings, etc. from entering the roller box and damaging the parts, but also prevents the lubricating oil inside the roller box from leaking to the outside.

[0016] As a further technical solution, a filling portion is formed between the sealing retainer and the upper slip ring for applying high-temperature resistant grease. Applying high-temperature resistant grease to the filling portion maximizes the resistance coefficient of the sealing structure, significantly reducing the amount of water and slag entering the seal. Furthermore, the grease will not melt due to the heat generated by the labyrinth during high-speed operation of the equipment, thus improving the performance of the labyrinth seal.

[0017] As a further technical solution, the protrusion is provided with multiple air holes (I), and the sealing retainer is provided with a compressed air channel extending into the protrusion. The two ends of each air hole (I) are connected to the compressed air channel and the outside, respectively. The protrusion is also provided with air holes (II), the two ends of which are connected to the compressed air channel and the C-shaped receiving portion, respectively. Connecting the air holes (I) to compressed air for positive pressure purging of the lower outer interface of the roller ring can significantly reduce the amount of water entering the labyrinth seal. Air holes (II) are connected to the C-shaped receiving portion, creating a pressure inside that is higher than the outside pressure, which can increase the seal's resistance coefficient and improve the overall sealing performance.

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

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

[0020] S1. Based on the resistance coefficients of the interlocking labyrinth seal and the through labyrinth seal, set the main dimensions of the interlocking labyrinth seal and the through labyrinth seal. The main dimensions include at least the labyrinth cell length, the labyrinth cell width, and the width of the labyrinth gap. Before operation, apply high-temperature resistant grease to the seal holder.

[0021] S2. When the equipment is running, the rollers rotate, which drives the upper and lower sliding rings on their outer sides to rotate within the sealing retainer.

[0022] S3, the upper slip ring, the lower slip ring, and the sealing cage form an interlocking labyrinth seal, and the straight-through sealing groove forms a straight-through labyrinth seal. The two sets of labyrinth seals cooperate with each other.

[0023] S4. Multiple air holes on the sealing retainer are connected to compressed air to perform positive pressure purging on the lower outer interface of the roller ring, reducing the amount of water entering the labyrinth seal. Air hole 2 is connected to the C-shaped receiving part, forming a pressure inside that is higher than the outside pressure, thereby increasing the seal resistance coefficient.

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

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

[0026] Calculate the width b of the free flow in a mating 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 interlocking labyrinth seal, and b0 is the width of the labyrinth gap;

[0027] Compare I and b r Where I is the width of the small chamber in the sealed interlocking labyrinth;

[0028] If I < b r Therefore, the resistance coefficient of the interlocking labyrinth seal is 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] Let b0 = 0.6 mm, s1 = 3 mm, and I1 = 1 mm;

[0031] Calculate the width b of the free flow 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 and b r1 Where I1 is the width of the small chamber in the straight-through labyrinth seal;

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

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] 1. This invention involves placing an upper slip ring on the side of the roll shaft near the roll ring and a lower slip ring on the side of the roll shaft near the roll box. During operation, as the roll shaft rotates, both the upper and lower slip rings rotate together. The first blocking part engages with the first labyrinth groove, and the second blocking part engages with the second sealing groove, forming a relatively complex labyrinth path. This increases the flow resistance of the fluid. The straight-through labyrinth seal and the interlocking labyrinth seal work together to increase the resistance coefficient of water, thereby increasing the resistance of fluid flow, reducing leakage, and further improving the sealing effect.

[0036] 2. By applying high-temperature resistant grease to the filling part, the amount of water and slag entering the machine can be greatly reduced. The grease will not be melted by the heat generated by the labyrinth during the high-speed operation of the equipment, which can improve the performance of the labyrinth seal.

[0037] ​3. By connecting the first air hole to compressed air to perform positive pressure purging on the lower outer interface of the roller ring, the amount of water entering the labyrinth seal can be greatly reduced. The second air hole is connected to the C-shaped receiving part, forming a pressure inside that is higher than the outside pressure, which can improve the sealing resistance coefficient and enhance the overall sealing performance. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of a comprehensive sealing structure for a high-speed wire rod mill and its usage method, provided as an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram showing the positional relationship between the labyrinth groove and the barrier part in a comprehensive sealing structure and its usage method for a high-speed wire rod mill, provided in an embodiment of the present invention.

[0041] Figure 3 This is a schematic diagram showing the positional relationship between the second barrier section and the second sealing groove in a high-speed wire rod mill integrated sealing structure and its usage method provided in an embodiment of the present invention.

[0042] In the diagram: 1. Roll box; 2. Roll shaft; 3. Roll ring; 4. Sealing structure; 401. Upper slip ring; 402. Lower slip ring; 403. C-shaped receiving part; 404. Sealing retainer; 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 passage. Detailed Implementation

[0043] The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover a non-exclusive inclusion, such as a process, method, system, product, or apparatus that includes a series of steps or units, not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In addition, the technical features of the various embodiments or individual embodiments provided by the present invention can be arbitrarily combined to form new technical solutions. Such combinations are not bound by the order of steps and / or structural composition patterns, but must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0045] Please see Figure 1-3 This invention provides a comprehensive sealing structure for a high-speed wire rod mill, comprising: a roll shaft 2 penetrating a roll box 1, a roll ring 3 coaxially mounted on the roll shaft 2, and a sealing structure 4 disposed between the roll ring 3 and the roll box 1, in order to reduce the possibility that iron oxide scale particles generated during a large amount of water-mixed rolling process will enter the roll box 1.

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

[0047] Specifically, the upper sliding ring 401 and the lower sliding ring 402 are fitted together and coaxially mounted to the outside of the roll shaft 2. After they are fitted together, the vertical section forms a C-shaped receiving part 403. The sealing retainer 404 is located between the two and is located on the outside of the C-shaped receiving part 403. The sealing retainer 404 has a protrusion 405 that extends into the C-shaped receiving part 403. The upper sliding ring 401 has multiple labyrinth grooves 406 that communicate with the C-shaped receiving part 403. The protrusion 405 forms multiple blocking parts 407 that extend into the labyrinth grooves 406. The protrusion 405 forms a sealing groove 408 that extends into the sealing groove 408. The lower sliding ring 402 forms a blocking part 409 that extends into the sealing groove 408.

[0048] The upper slip ring 401 is located on the side of the roll shaft 2 near the roll ring 3, and the lower slip ring 402 is located on the side of the roll shaft 2 near 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 first barrier part 407 cooperates with the first labyrinth groove 406, and the second barrier part 409 cooperates with the second sealing groove 408 to form a more complex labyrinth path, thereby increasing the flow resistance of the fluid.

[0049] In this embodiment, a sealing element 410 is provided on the side of the upper slip ring 401 near the roll shaft 2, and a sealing element 411 is provided on the side of the lower slip ring 402 near the roll shaft 2.

[0050] By setting a first seal 410 and a second seal 411, and wherein the first seal 410 and the second seal 411 are existing and known annular rubber seals, the sealing effect can be further improved.

[0051] In this embodiment, the C-shaped receiving portion 403 is provided with a lip seal 412 that fits against the protrusion 405 on the sealing retainer 404, and its two ends abut against the upper sliding ring 401 and the lower sliding ring 402 respectively.

[0052] The lip seal 412 is shaped like a lip, which not only prevents external water, iron filings, etc. from entering the roller box 1 and damaging the parts, but also prevents the lubricating oil inside the roller box 1 from leaking to the outside of the roller box 1.

[0053] In this embodiment, multiple through-type sealing grooves 413 are provided on the sealing retainer 404 and the sliding ring 402 to form multiple through-type labyrinth seals, thereby increasing the water resistance coefficient.

[0054] Straight-through labyrinth seals and interlocking labyrinth seals work together to increase the resistance to fluid flow by increasing the water resistance coefficient, 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 slip ring 401, and the filling portion 414 is coated with high-temperature resistant grease.

[0056] Applying high-temperature resistant grease to the filling section 414 can significantly reduce the amount of water and slag entering the system. This grease will not melt due to the heat generated by the labyrinth during high-speed operation of the equipment, thus improving the performance of the labyrinth seal.

[0057] In this embodiment, the protrusion 405 is provided with a plurality of air holes 4151, and the sealing retainer 404 is provided with a compressed air channel 416 extending into the protrusion 405. The two ends of the air holes 4151 are respectively connected to the compressed air channel 416 and the outside. The protrusion 405 is also provided with air holes 4152, and the two ends of the air holes 4152 are respectively connected to the compressed air channel 416 and the C-shaped receiving part 403.

[0058] Connecting vent 4151 to compressed air for positive pressure purging of the lower outer interface of roller ring 3 can significantly reduce the amount of water entering the labyrinth seal, improving the overall sealing performance. Vent 4152 communicates with the C-shaped receiving part 403, creating a pressure inside that is higher than the external pressure, which can increase the seal's resistance coefficient.

[0059] In this embodiment, multiple through-type sealing grooves 413 are respectively opened on the opposite side of a pair of barrier parts 1 407 and on one side of barrier part 2 409.

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

[0061] This invention provides a method for using a comprehensive sealing structure for a high-speed wire rod mill, comprising the following steps:

[0062] S1. Based on the resistance coefficients of the interlocking labyrinth seal and the through labyrinth seal, set the main dimensions of the interlocking labyrinth seal and the through labyrinth seal. The main dimensions include at least the labyrinth cell length, the labyrinth cell width, and the width of the labyrinth gap. Before operation, apply high-temperature resistant grease to the seal retainer 404.

[0063] S2. When the equipment is running, the roller shaft 2 rotates, which drives the upper sliding ring 401 and the lower sliding ring 402 on its outer side to rotate within the sealing retainer 404.

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

[0065] S4. Multiple air holes 4151 on the sealing retainer 404 are connected to compressed air to perform positive pressure purging on the lower outer interface of the roller ring 3, reducing the amount of water entering the labyrinth seal. Air hole 4152 is connected to the C-shaped receiving part 403, forming a pressure inside that is higher than the outside pressure, thereby increasing the sealing resistance coefficient.

[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 pressure energy of the water is converted into kinetic energy, and the pressure drops rapidly. The kinetic energy is dissipated into heat energy in the expansion chamber through vortices and friction generated during the flow. The kinetic energy is reduced but does not recover into pressure energy. Then, the portion of the leaking water with reduced pressure and flow velocity enters the next expansion chamber through the next throttling point, and the water pressure and flow velocity are reduced again. Through the repeated throttling and expansion processes, the pressure and flow velocity of the water leaking from the high-pressure side are reduced to the minimum, thus achieving the sealing effect.

[0067] The original maze sealing calculation was as follows:

[0068] The existing rolling mill sealing structure uses a double-frame lip seal installed back-to-back. The seal lips are in close contact with the ceramic-coated bushing of the roll shaft while maintaining a certain amount of elastic deformation. A cavity of approximately 3mm in height is left between the two seals, through which oil and gas are circulated for lubrication and cooling between the seal and the bushing. 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 routine maintenance and repairs, ensuring normal system operation. The sealing end cover and the upper fixed roll ring cage cooperate with each other to form a labyrinth-type external seal.

[0069] The method for calculating the water resistance coefficient of the maze is as follows:

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

[0071] b r =2.4as+b0;

[0072] On-site measurements showed s = 4.5 mm, b0 = 0.75 mm, and I = 4.0 mm.

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

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

[0075] Based on two small chambers, the combined resistance coefficient of the two chambers is Ф=2Ф1=0.344. If the resistance coefficient is too small, when the lip seal wears, a large amount of water mixed with the iron oxide scale particles generated during rolling will enter the roll box and be carried into the lubrication system, causing a large consumption of the filter element of the lubrication station and easily causing oil emulsification, which seriously affects the operation of the equipment.

[0076] The aforementioned labyrinth seal has too low a resistance coefficient to water, and the labyrinth can only barely form two small chambers. If the adjustment range of the field equipment such as roller rings, sealing end caps, and roller rings is met, it is possible to increase the number of labyrinths and improve the key dimensions of labyrinth formation to further enhance the effect of the labyrinth seal. It is also possible to consider changing the original structural type of the seal.

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

[0078] Based on the structural characteristics of Morgan's 6th generation high-speed wire rod mill and actual on-site measurements, the labyrinth gap width b0 can be reduced from 0.75mm to 0.6mm while still ensuring normal operation of the roll shaft without interference. At the same time, the width I of the aforementioned 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] Calculate the width b of the free flow in a mating labyrinth seal. r b r =2.4as+b0=1.68;

[0082] In the formula, a is the structure coefficient of the fluid flow, b r s is the width of the free flow in the interlocking labyrinth seal, s is the length of the labyrinth chamber in the interlocking labyrinth seal, and b0 is the width of the labyrinth gap;

[0083] Compare I and b r Where I is the width of the small chamber in the sealed interlocking labyrinth;

[0084] When I=1.5 r ;

[0085] The drag coefficient of the interlocking labyrinth seal is Ф2 = 1.5 (1 - b0 / I). 2 =1.5 (1-0.6 / 1.5) 2 =0.54;

[0086] With a total of 4 chambers, the total resistance coefficient of the interlocking labyrinth seal for the 4 chambers is Ф3 = 4 × 0.54 = 2.16.

[0087] The design and calculation method for a straight-through labyrinth seal are as follows:

[0088] ​Domestic researchers, including Huang Shoulong, used a combination of numerical simulation and experiments to study the effects of cavity tendency, cavity shape, cavity size, and medium flow direction on the sealing efficiency of a straight-through labyrinth seal. They pointed out that as the inlet and outlet pressure ratio of the labyrinth structure increases, the leakage initially increases rapidly and then gradually tends towards a constant value. When other structural parameters remain unchanged, the leakage exhibits a minimum value with respect to the relative thickness of the tooth tips; this phenomenon mainly occurs in the case of thick teeth. Increasing the number of teeth within a certain range can reduce leakage, but the effect becomes less significant beyond a certain number of teeth. That is, for a given total structural length, there exists an optimal number of teeth or cavity width that minimizes leakage. When other structural parameters remain unchanged, the leakage increases with the ratio of the gap to the cavity width. Excessively deepening the cavity does not improve the sealing performance of the labyrinth; there exists an optimal cavity depth-to-width ratio that minimizes leakage.

[0089] Analysis suggests that rectangular grooves are advantageous for processing. The gap width of the labyrinth has been determined to be 0.6mm. Based on the flow field calculation results of a straight-through rectangular labyrinth groove simulated by FLUENT software, when the labyrinth gap is 0.6mm, considering the depth of the sealing end cap, the convenience of processing, and the more reasonable positional and structural relationship of the components at the sealing end cap, the depth of the rectangular groove is taken as 1mm and the width as 3mm. A total of 3 rectangular grooves are processed on the sealing end cap and the sliding ring.

[0090] Next, calculate the drag coefficient of the straight-through maze:

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

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

[0093] In the formula, a is the structure coefficient of the fluid flow, b r1 s1 is the width of the free flow in the straight-through labyrinth seal, b0 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 and b r1 Where I1 is the width of the small chamber in the straight-through labyrinth seal;

[0095] When I1=1 r1 Therefore, the drag coefficient of the straight-through maze is 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 drag coefficients Ф of the four interlocking labyrinths and three straight-through labyrinths used in the sealing structure of this device is then calculated. 总 =Ф3+Ф5=2.88.

[0097] Therefore, the resistance coefficient of the new labyrinth seal can reach 2.88, which is significantly higher than the original design. This greatly reduces the amount of rolling water and iron oxide scale entering the lip seal, thus significantly reducing the amount of water and slag entering. Since the rolling mill rolls are at a 45-degree angle to the horizontal plane, and the sealing end cap is parallel to the rolling mill shaft and also at a 45-degree angle to the horizontal plane, the design ensures that the lowest point of the lip seal is 6mm higher than the lowest point of the sealing end cap. This ensures that any small amount of water entering the labyrinth seal can flow out smoothly under gravity, guaranteeing the normal operation of the lip seal.

[0098] High-temperature resistant grease is pre-applied to the filling part 414 in the sealing retainer 404. During equipment operation, the I value can be reduced to the greatest extent while ensuring normal equipment operation, so that the sealing performance of this labyrinth seal can be maximized.

[0099] Through the above analysis and calculation, the key dimensions of the labyrinth seal can be precisely set, such as the length and width of the labyrinth chambers and the width of the labyrinth gaps. While ensuring ease of processing, a straight-through sealing groove has been redesigned, making the resistance coefficient of the new seal far exceed that of the original design. At the same time, high-temperature resistant grease is applied to the filling part 414 in the seal retainer 404 each time the seal is replaced. It will not be melted by the heat generated by the labyrinth during high-speed operation of the equipment, which can improve the performance of the labyrinth seal.

[0100] Six small air holes 4151 are set on the sealing retainer 404. Compressed air is connected to the lower outer interface of the roller ring 3 for positive pressure purging, which can greatly reduce the amount of water entering the labyrinth seal. The second air hole 4152 is connected to the C-shaped receiving part 403, and a pressure higher than that of the outside is formed inside it, which can improve the sealing resistance coefficient and improve the overall sealing performance.

[0101] This significantly reduces the amount of water and slag entering the equipment, ensuring its normal operation. Furthermore, it ensures that the equipment can continue to operate normally in the short term even with wear on the skirt seal.

[0102] In summary, through the above analysis and calculations, this invention can accurately set various key dimensions of the labyrinth seal, such as the length and width of the labyrinth chambers and the width of the labyrinth gaps. Furthermore, while ensuring ease of processing, a new through-type sealing groove has been designed, resulting in a resistance coefficient for the new seal that far exceeds that of the original design. Additionally, each time the seal is replaced, high-temperature resistant grease is applied to the filling part 414 of the seal retainer 404, preventing it from melting due to the heat generated by the labyrinth during high-speed operation, thus maximizing the performance of the labyrinth seal.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A method for using a comprehensive sealing structure for a high-speed wire rod mill, characterized in that, The sealing structure (4) is set between the roll ring (3) and the roll box (1) of the high-speed wire rod mill. The roll ring (3) is coaxially mounted on the roll shaft (2) of the high-speed wire rod mill. The sealing structure (4) includes an upper slip ring (401), a lower slip ring (402), and a sealing retainer (404). The upper slip ring (401) and the lower slip ring (402) are arranged in an upper and lower fit together and are coaxially installed on the outside of the roll shaft (2). After the two are fitted together, the vertical section forms a C-shaped receiving part (403), and the sealing retainer (404) is located between the two. A sealing retainer (404) is provided on the outside of the C-shaped receiving portion (403) and has a protrusion (405) extending into the C-shaped receiving portion (403); The upper sliding ring (401) has multiple labyrinth grooves (406) communicating with the C-shaped receiving part (403). The protrusion (405) forms multiple blocking parts (407) extending outward into the labyrinth grooves (406). The protrusion (405) forms a sealing groove (408) inward. The lower sliding ring (402) forms a blocking part (409) extending outward into the sealing groove (408). The upper slip ring (401), the lower slip ring (402), and the sealing retainer (404) form a multi-interlocking labyrinth seal; The sealing retainer (404) and the sliding ring (402) are provided with multiple through-type sealing grooves (413) to form multiple through-type labyrinth seals; The method of use includes the following steps: Based on the resistance coefficients of the interlocking labyrinth seal and the through labyrinth seal, the main dimensions of the interlocking labyrinth seal and the through labyrinth seal are set. The main dimensions include at least the labyrinth cell length, the labyrinth cell width, and the width of the labyrinth gap. Before operation, high-temperature resistant grease is applied to the seal holder (404). When the equipment is running, the roller shaft (2) rotates, which drives the upper sliding ring (401) and the lower sliding ring (402) on its outer side to rotate within the sealing retainer (404); The upper slip ring (401), the lower slip ring (402) and the sealing retainer (404) form an interlocking labyrinth seal, and the straight-through sealing groove (413) forms a straight-through labyrinth seal. The two sets of labyrinth seals cooperate with each other. Compressed air is connected to multiple air holes (4151) on the sealing retainer (404) to perform positive pressure purging on the lower outer interface of the roller ring (3), reducing the amount of water entering the labyrinth seal. Air holes (4152) are connected to the C-shaped receiving part (403), forming a pressure higher than the outside inside, which increases the resistance coefficient of the seal.

2. The method of using the integrated sealing structure for a high-speed wire rod mill according to claim 1, characterized in that, The method for calculating the resistance coefficient of the interlocking labyrinth seal is as follows: Let b0 = 0.6 mm, s = 5 mm, and I = 1.5 mm; Calculate the width b of the free flow in a mating 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 interlocking labyrinth seal, and b0 is the width of the labyrinth gap; Compare I and b r Where I is the width of the small chamber in the sealed interlocking labyrinth; If I < b r Therefore, the resistance coefficient of the interlocking labyrinth seal is Ф2 = 1.5 (1 - b0 / I). 2 .

3. The method of using the integrated sealing structure for a high-speed wire rod mill according to claim 1, characterized in that, The resistance coefficient of the straight-through labyrinth seal is calculated as follows: Let b0 = 0.6 mm, s1 = 3 mm, and I1 = 1 mm; Calculate the width b of the free flow 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 and b r1 Where I1 is the width of the small chamber in the straight-through labyrinth seal; If I1 r1 Therefore, the resistance coefficient of the straight-through labyrinth seal is Ф4 = 1.5 (1 - b0 / I1). 2 .​ 4. The method of using the integrated sealing structure for a high-speed wire rod mill according to claim 1, characterized in that, The upper slip ring (401) is disposed on the side of the roll shaft (2) near the roll ring (3), and the lower slip ring (402) is disposed on the side of the roll shaft (2) near the roll box (1).

5. The method of using the integrated sealing structure for a high-speed wire rod mill according to claim 1, characterized in that, The upper slip ring (401) is provided with a sealing element one (410) on the side near the roll shaft (2), and the lower slip ring (402) is provided with a sealing element two (411) on the side near the roll shaft (2).

6. The method of using the integrated sealing structure for a high-speed wire rod mill according to claim 1, characterized in that, The C-shaped receiving part (403) is provided with a lip seal (412) that fits against the protrusion (405) on the sealing retainer (404), and its two ends abut against the upper sliding ring (401) and the lower sliding ring (402) respectively.

7. The method of using the integrated sealing structure for a high-speed wire rod mill according to claim 1, characterized in that, A filling portion (414) is formed between the sealing retainer (404) and the upper slip ring (401) for applying high-temperature resistant grease.

8. The method of using the integrated sealing structure for a high-speed wire rod mill according to claim 1, characterized in that, The protrusion (405) is provided with a plurality of air holes (4151), and the sealing retainer (404) is provided with a compressed air channel (416) extending into the protrusion (405). The two ends of the air holes (4151) are respectively connected to the compressed air channel (416) and the outside. The protrusion (405) is also provided with air holes (4152). The two ends of the air holes (4152) are respectively connected to the compressed air channel (416) and the C-shaped receiving part (403). The air holes (4152) are connected to the C-shaped receiving part (403), forming a pressure higher than that of the outside inside, thereby increasing the sealing resistance coefficient.

9. The method of using the integrated sealing structure for a high-speed wire rod mill according to claim 1, characterized in that, Multiple through-type sealing grooves (413) are respectively opened on the opposite side of the pair of barrier part one (407) and on one side of barrier part two (409).

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