Sliding helical synchronizing radial adjustment roll sleeve

Abstract

The application discloses a sliding spiral synchronous radial adjusting roll sleeve, which comprises a sleeve body, two mirror-symmetrical grooves are arranged in the inner cavity of the sleeve body, and a radial through hole is arranged on the sleeve body at the position corresponding to the groove; an adjusting key plate is arranged in the groove in a gap fit mode and is used for abutting against the flat bearing surface of the journal; a radial spiral rod passes through the sleeve body, opposite thread segments are arranged at the two ends of the radial spiral rod, and the two thread segments are respectively connected with an adjusting key plate in a threaded connection mode. The application can meet the requirement of close fit of the small interference connection between the roll journal and the roll sleeve during rolling, can realize the convenient function of fast plug-in with large gap loose fit during maintenance operation, has the remarkable characteristics of simple structure, convenient maintenance, convenient operation and high speed, has high working reliability, has high general applicability and has high industry popularization value.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and in particular to a sliding spiral synchronous radial adjustment roll bushing. Background Technology

[0002] Currently, the roll drive side journals of hot-rolled bar and section mills in China generally adopt a "flat square / circular arc four-segment combined positioning and bearing" structure. The outer dimensions of these roll drive side journals are designed as a mirror-symmetrical "double circular arc two-plane" structure: it has two sets of left-right symmetrical "flat square bearing surfaces" and two sets of top-bottom symmetrical "circular arc guide positioning surfaces," totaling four segments. See details... Figure 1 and 2 Drawing of a rolling mill roll.

[0003] The aforementioned roll journal and inner hole have the same cross-sectional structure and external dimensions as described above. The "roll bushing" is "axially inserted with a small clearance shaft hole fit" through the push / pull of the mill's transverse hydraulic cylinder. Together they form an "axially inserted assembly" and transmit the rolling torque to drive the free upper and lower rolls on the mill stand to rotate circumferentially, biting and crushing the hot workpiece.

[0004] Therefore, to achieve "quick assembly and disassembly" of the mill stand on-site and improve the efficiency of slot and roll changing, most domestic hot rolling production lines currently adopt a shaft-hole fit structure with a small clearance between the "mill bushing inner hole" and the "roll journal". Two sets of mirror-symmetrically arranged wear-resistant key plates are designed on the roll bushing, each fixed to the inner cavity of the roll bushing with two sets of internal hexagonal bolts. The fit clearance between the key plate working surface and the symmetrical "flat square plane" of the roll journal is adjusted by adding or subtracting the number and thickness of the adjusting shims on the mating surface between the key plate and the groove of the roll bushing inner cavity. This transmits the rolling torque, and simultaneously utilizes two upper and lower arcs on the roll bushing and roll journal for small-clearance guiding and positioning, enabling rapid assembly and disassembly and axial push-pull separation of the mill on-site. A schematic diagram of the mill bushing can be found in the appendix. Figure 3 and attached Figure 4 .

[0005] Because the original design included varying degrees of clearance in the "flat rectangular bearing area" and "circular arc positioning area" of the aforementioned roll journal and roll sleeve "assembly" (for easy on-site assembly and disassembly), during the rolling process, due to the rotational inertia of the object, the "axial insertion assembly" will inevitably cause the passive roll journal to "circumferentially rotate and slide" within the active roll sleeve at the moment of torque synchronization. This results in varying degrees of sliding wear on the two sets of "positioning arc lines" and "wear-resistant key plates" within the inner hole of the roll sleeve. This leads to a further increase in the clearance between the shaft and the hole, severely affecting the synchronous transmission accuracy of the upper and lower rolls at the moment of "biting" the steel. This results in a significant difference in the "instantaneous bite rotational speed" of the upper and lower rolls, causing process failures such as unstable material profiles and bending deformation at the mill exit. It is particularly detrimental to the process control of hot-rolled profiles / bars with high added value and high precision dimensional requirements, seriously affecting the dimensional accuracy and yield of the products. It also significantly impacts the safety of personnel on the rolling mill floor, and is a common technical problem that urgently needs to be solved in hot rolling production. A schematic diagram of asynchronous rotation can be found in the appendix. Figure 5 .

[0006] In theory, the rolling process requires a very tight fit between the "roll journal" and the "roll sleeve," ideally using a large interference fit to increase radial pressure, eliminate clearance, and improve the overall rigidity, rotational synchronization accuracy, and stability of the "axial insertion assembly" of the upper and lower rolls. However, if the inner hole design of the "roll journal" and "roll sleeve" is designed with a high-rigidity, large interference fit simply to meet the theoretical rolling process requirements, it often results in a large overall rigidity and overly tight fit of the "axial insertion assembly." This can make it difficult to axially separate the mill body—the roll journal—from the mill train transmission system—the roll sleeve during on-site maintenance or roll changing. In such cases, hydraulic jacks and flame heating must be used to preheat the "roll sleeve" to a certain temperature before "axial separation of the hot radial clearance" can be achieved with the "roll journal."

[0007] In summary, the current domestic hot-rolling / bar / wire mills face a significant contradiction between the requirements for quick assembly and disassembly of roll journals and roll sleeves during on-site maintenance / roll replacement and the theoretical process requirement of "zero clearance and high rigidity" during rolling. A reasonable solution must be found that simultaneously addresses both requirements, satisfying both the theoretical requirements of zero clearance, high rigidity, and large interference fit during normal rolling operations, and enabling flexible and rapid assembly and disassembly with large clearance during maintenance and roll replacement. This is a common problem faced by domestic hot-rolling production lines. Summary of the Invention

[0008] To address some or all of the technical problems existing in the prior art, the present invention provides a sliding spiral synchronous radial adjustment roll bushing. The technical solution is as follows:

[0009] A sliding spiral synchronous radially adjustable roll bushing is provided, comprising: a bushing body, wherein the inner cavity of the bushing body is provided with two grooves mirror-symmetrically arranged, and a radially through hole is provided on the bushing body at the position corresponding to the groove; an adjusting key plate is disposed in the groove in a clearance fit manner for abutting against the flat bearing surface of the journal; and a radial spiral rod passing through the bushing body, wherein both ends are provided with threaded sections with opposite directions of rotation, and each is threadedly connected to one of the adjusting key plates.

[0010] In some alternative configurations, a first sliding copper sleeve is disposed within the first perforation, and one end of the radial helical rod passes through the first adjusting key plate and the first sliding copper sleeve via a threaded connection.

[0011] In some alternative implementations, a first elastic retaining ring is provided inside the first perforation at the end of the first sliding copper sleeve.

[0012] In some alternative implementations, the end of the radial helical rod located outside the first perforation is fitted with a first locking nut.

[0013] In some alternative implementations, the other end of the radial helical rod is fitted with a radial helical sleeve, and a second sliding copper sleeve is provided in the second through hole. The radial helical sleeve passes through the second adjusting key plate and the second sliding copper sleeve in a threaded connection manner.

[0014] In some alternative implementations, the radial helical sleeve and the radial helical rod are connected by a transverse nut tapered pin.

[0015] In some alternative implementations, a second elastic retaining ring is provided inside the second perforation at the end of the second sliding copper sleeve.

[0016] In some alternative implementations, a second locking nut is fitted onto the portion of the radial helical rod located outside the second through hole.

[0017] In some alternative implementations, the groove depth is 2 mm greater than the thickness of the adjustment key plate, so that the radial sliding distance of the adjustment key plate on one side is 1-2 mm.

[0018] In some alternative implementations, both ends of the radial helical rod are provided with internal hexagonal grooves.

[0019] The main advantages of the technical solution of this invention are as follows:

[0020] The sliding spiral synchronous radial adjustment roll bushing of the present invention can be applied to the connection and separation of the rolling mill and the transmission system of the rolling mill in hot rolling production. It can meet the requirements of tight fit of small interference between the roll journal and the roll bushing during rolling, and can also realize the convenient function of quick insertion of large clearance loose fit during maintenance. It has the significant characteristics of simple structure, convenient maintenance, convenient operation and speed, high reliability, strong applicability and great industry promotion value. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and constitute a part of this invention, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a rolling mill roll in the prior art;

[0023] Figure 2 This is a cross-sectional view of the journal of a roll in the prior art;

[0024] Figure 3 This is a front view of a roll bushing in the prior art;

[0025] Figure 4 This is a side sectional view of a roll bushing in the prior art;

[0026] Figure 5 This is a schematic diagram of the rotational sliding process of the roll journal and roll shaft assembly in the existing technology.

[0027] Figure 6 This is a schematic diagram of the structure of a sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention;

[0028] Figure 7 This is an assembly diagram of a sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention;

[0029] Figure 8 This is a partial enlarged view of the sliding spiral synchronous radial adjustment roll bushing at the first perforation according to an embodiment of the present invention;

[0030] Figure 9 This is a partial enlarged view of the sliding spiral synchronous radial adjustment roll bushing at the second perforation according to an embodiment of the present invention;

[0031] Figure 10 This is a front view of the bushing body in a sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention;

[0032] Figure 11 This is a side view of the bushing body in a sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention;

[0033] Figure 12 This is a schematic diagram of the structure of the first adjusting key plate in the sliding spiral synchronous radial adjusting roll bushing according to an embodiment of the present invention;

[0034] Figure 13 This is a schematic diagram of the structure of the second adjusting key plate in the sliding spiral synchronous radial adjusting roll bushing according to an embodiment of the present invention;

[0035] Figure 14 This is a schematic diagram of the radial helical rod in a sliding helical synchronous radial adjustment roll bushing according to an embodiment of the present invention;

[0036] Figure 15 This is a schematic diagram of the radial spiral sleeve in a sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention;

[0037] Figure 16 This is a schematic diagram of the structure of the first sliding copper sleeve in the sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention;

[0038] Figure 17 This is a schematic diagram of the structure of the second sliding copper sleeve in the sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention;

[0039] Figure 18 This is a schematic diagram of the nut tapered pin in the sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention;

[0040] Figure 19 This is a schematic diagram illustrating the working principle of a sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention.

[0041] Figure 20 This is a schematic diagram of the assembly process of a sliding spiral synchronous radial adjustment roll bushing according to an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1-Sleeve body, 101-First groove, 102-Second groove, 103-First through hole, 104-Second through hole, 2-First adjusting key plate, 3-Second adjusting key plate, 4-Radial spiral rod, 5-Radial spiral sleeve, 6-First sliding copper sleeve, 7-First elastic retaining ring, 8-First locking nut, 9-Second sliding copper sleeve, 10-Second elastic retaining ring, 11-Second locking nut, 12-Nut tapered pin. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0045] The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] This invention provides a sliding spiral synchronous radial adjustment roll bushing, which has the following characteristics: it is used for the connection and separation of the rolling mill and the transmission system of the rolling mill in the hot rolling production site. It can meet the requirements of tight fit with small interference between the roll journal and the roll bushing during rolling, and can also realize the convenient function of quick insertion with large clearance loose fit during maintenance. It has the significant characteristics of simple structure, convenient maintenance, convenient operation and speed, high reliability, strong applicability and great industry promotion value.

[0047] The integral sliding spiral synchronous radial adjustment roll bushing provided in this embodiment of the invention adopts a modular unit design, a mirror two-point symmetrical clamping wear-free design, and two sets of mirror symmetrical double spiral clamping mechanisms that simultaneously apply preload. It can be operated and adjusted in both directions, avoiding localized off-center loading and exhibiting high reliability and versatility. Its internal structure design adopts a detachable modular approach. Components such as the first adjustment key plate 2, the second adjustment key plate 3, the radial spiral rod 4, and the radial spiral sleeve 5 are all repeatedly detachable and adjustable components. They do not need to be replaced after wear; only the preload needs to be adjusted to eliminate the fit clearance. The symmetrical clamping force of this mechanism has online linear adjustability, strong adaptability, and completely eliminates the fit clearance between the roll journal and the roll bushing in traditional solutions. It fully meets the high rigidity and high precision rotational synchronous rolling process requirements of the upper and lower rolls of the rolling mill, while also facilitating quick assembly and disassembly of the rolling mill and the roll bushing, improving roll changing efficiency and reducing labor intensity.

[0048] Furthermore, as shown in the appendix Figure 6-13 As shown, the sliding spiral synchronous radial adjustment roll bushing provided in this embodiment of the invention mainly includes: a bushing body 1, a first adjustment key plate 2, a second adjustment key plate 3, a radial spiral rod 4, a radial spiral sleeve 5, and some other related accessories. Its internal double-rotation sliding spiral adjustment mechanism, formed by the radial spiral rod 4 and the radial spiral sleeve 5 connected by a nut and tapered pin 12, is compact, has a large load-bearing capacity, can withstand large rolling torques, and is easy to adjust, facilitating quick assembly and disassembly on-site. It possesses the structural advantages of simplicity, reliability, efficiency, and speed.

[0049] Furthermore, the inner hole of the bushing body 1 has two sets of mirror-symmetrical flat bearing areas, which adopt a new design structure of first adjusting key plate 2 and second adjusting key plate 3. Two sets of first sliding copper sleeves 6 and second sliding copper sleeves 9 are also inlaid on the side wall of the bushing body 1. By utilizing the internal axial force in the above-mentioned double-rotation sliding spiral adjustment mechanism, symmetrical radial pressure is applied to the first adjusting key plate 2 and second adjusting key plate 3 at the same time, so that the working surface of the first adjusting key plate 2 and second adjusting key plate 3 is tightly interference-fitted with the flat surface of the roll journal, thereby improving its static friction value and transmitting rolling torque.

[0050] Furthermore, even if the aforementioned mating working surfaces experience wear and slippage due to insufficient axial force provided by the double sliding screw adjustment mechanism, the radial pressure of the flat mating surface formed by the first adjustment key plate 2 and the second adjustment key plate 3 in the roller journal and bushing body 1 can be increased by adjusting the radial screw rod 4, thereby improving its sliding static friction value, meeting the on-site requirements for transmitting different torques, and avoiding frequent adjustments and replacements of worn key plates.

[0051] Furthermore, if there are significant differences in the fit dimensions of the "bearing area flat side" of the roll journal due to processing errors or other reasons, clamping compensation can be achieved by rotating the radial helical rod 4, so that the roll journal and the flat side of the bushing body 1 still maintain a sufficiently large interference fit. This results in lower sensitivity to the dimensional errors and parallelism tolerances of the roll journal, and better adaptability to the assembly of different roll dimensions on site.

[0052] Furthermore, the inner cavity of the bushing body 1 adopts a "double arc clearance fit guide positioning" design. When assembling with the roll journal, the design fit clearance of the upper and lower arc surfaces is controlled between 0.3mm and 0.4mm. If the clearance is too large, the original guide positioning function will be lost, and the synchronous rotation rigidity will be poor. If the clearance is too small, the axial insertion assembly formed by the roll journal and the roll bushing will be too tight, causing difficulties in on-site assembly and disassembly.

[0053] Furthermore, in terms of the motion principle, the present invention employs two relatively independent right-handed and left-handed helical rods, which are rigidly connected by a nut and a conical pin 12, and each is fitted with its own left-handed or right-handed nut, i.e., two adjusting key plates. The transmission method is "screw rotation, nut linear sliding". The inner cavity groove in the bushing body 1 is equivalent to a "nut anti-rotation mechanism", which allows the first adjusting key plate 2 and the second adjusting key plate 3 to slide linearly along the side wall of the rectangular cross-section inner cavity groove in the bushing body 1 without rotating.

[0054] In this embodiment, a first groove 101 and a second groove 102 are milled symmetrically in the inner cavity of the bushing body 1 to assemble the first adjusting key plate 2 and the second adjusting key plate 3, respectively. Note that the width and depth of the grooves in the inner cavity of the bushing body 1 are slightly larger than the width and thickness of the first adjusting key plate 2 and the second adjusting key plate 3, with a small clearance loose fit between them, so that the first adjusting key plate 2 and the second adjusting key plate 3 can be easily inserted axially along the side wall of the groove of the bushing body 1 and slide freely up and down. At the same time, a Ф44 stepped hole is drilled in the center of the groove in the inner cavity of the bushing body 1 to embed and position the first sliding copper sleeve 6 and the second sliding copper sleeve 9, respectively. Then, the first elastic retaining ring 7 and the second elastic retaining ring 10 are used to fix them radially to prevent the first sliding copper sleeve 6 and the second sliding copper sleeve 9 from radially moving and falling off in the first through hole 103 and the second through hole 104 of the bushing body 1.

[0055] In this embodiment, the first adjusting key plate 2 and the second adjusting key plate 3 are based on the original roller bushing key plate parts, but the 2-M16 internal thread hole design is cancelled. Instead, M22X1.5 right-hand threaded holes and M33X1.5 left-hand threaded holes are designed and machined in the center of their backs, respectively, which are screwed into the radial spiral rod 4 and the radial spiral sleeve 5 to form a sliding spiral pair with left and right double helical directions.

[0056] Furthermore, both the first sliding copper sleeve 6 and the second sliding copper sleeve 9 are made of ZcuAl10Fe3 bronze, primarily serving to support and reduce friction during the rotation and adjustment of the radial screw and radial spiral sleeve 5. Their Ф36 inner holes must be precision machined and designed with oil reservoirs for online grease lubrication and friction reduction. Specifically, the inner hole of the first sliding copper sleeve 6 is specially designed with a Ф32X3 inner hole recess, mainly for assembly and positioning during the installation of the radial spiral rod 4. After the system is assembled, the (Ф34~Ф36)X10 conical platform end face on the radial spiral rod 4 must contact the Ф32X3 inner hole step surface on the first sliding copper sleeve 6, playing a crucial role in the system's radial positioning. The second sliding copper sleeve 9 primarily supports and reduces friction on the radial spiral sleeve 5, also employing online lubrication, but does not require radial positioning.

[0057] Furthermore, the radial helical rod 4 is a key load-bearing and adjusting component of the present invention. It is a slender rod-shaped component made of 20CrMnTi alloy steel and heat-treated to improve its rigidity, strength, and wear resistance. The radial helical rod 4 is designed with two sections of right-hand external threads of M22X1.5. The tapered M22X1.5 external thread at the end is used to screw with the second locking nut 11 to press the radial helical rod 4 and the radial helical sleeve 5 together. The axial prestress eliminates the tooth flank clearance of the threaded pair and improves the adjustment accuracy. The other section of M22X1.5 external thread is used to screw with the first adjusting key plate 2 to drive the first adjusting key plate 2 to slide back and forth linearly along the inner cavity groove of the bushing body 1. In particular, a (Ф34~Ф36)X10 truncated cone is specially designed on the radial helical rod 4 to facilitate positioning and guidance during assembly. Multiple sets of online lubrication channels are designed in the axial and radial directions of its body. In particular, both end faces are designed with internal hexagonal grooves for online adjustment, which can be used selectively.

[0058] Furthermore, the radial spiral sleeve 5 is another key load-bearing and adjusting component of the present invention. It is a hollow sleeve-type component, with the radial spiral rod 4 passing through its inner hole axially. Its outer wall consists of three parts: one part is designed with an M33X1.5 left-hand external thread for screwing onto the second adjusting key plate 3 and driving the key plate to slide linearly back and forth; another part has a Ф36 outer circle that slides and frictionally engages with the second sliding copper sleeve 9; and the last part has a Ф42X15 shoulder, which is used by the second locking nut 11 to press the radial spiral sleeve 5 tightly against the side wall of the bushing body 1. The outer circle of the Ф42X15 shoulder on the radial spiral sleeve 5 adopts a standard external hexagonal design, which facilitates clamping when it is screwed into the second adjusting key plate 3. An annular oil groove is designed on the shoulder surface that contacts the bushing body 1 to reduce frictional resistance, and multiple sets of oil channels are also designed in its radial direction for online grease lubrication.

[0059] Furthermore, both the radial helical rod 4 and the radial helical sleeve 5 are designed with drilled tapered holes for installing the nut tapered pin 1210, and are secured with an M8 nut for anti-loosening and thrust protection, so that the two are combined into one, forming a rigidly connected double-rotating sliding helix.

[0060] Furthermore, after the radial helical rod 4 passes through the radial helical sleeve 5, a first locking nut 8 and a second locking nut 11 are screwed onto both ends of the radial helical rod 4 respectively for axial rigid pre-tightening, so as to tightly connect the rigid helical body formed by the radial helical rod 4 and the radial helical sleeve 5 with the bushing body 1 into a whole, eliminating gaps.

[0061] In summary, the specific on-site operation, adjustment steps, and operating principle of the sliding spiral synchronous radial adjustment roll bushing provided in this embodiment of the invention are as follows:

[0062] In the first working condition, during normal rolling production, the bushing body 1 needs to be tightly connected with the roll journal with an interference fit to reliably transmit the rolling torque. The first adjusting key plate 2 and the second adjusting key plate 3 need to tightly hold the flat bearing surface of the roll journal.

[0063] First, manually rotate the bushing body 1 so that the inner cavity groove of the bushing body 1 is perpendicular to the ground. At this time, the first sliding copper sleeve 6 and the second sliding copper sleeve 9, which are screwed onto the radial helical rod 4 and the radial helical sleeve 5, should both be in a horizontal state parallel to the ground. Insert the first adjusting key plate 2 and the second adjusting key plate 3 axially into the inner cavity groove of the bushing body 1 in a perpendicular state.

[0064] Next, the radial helical rod 4 is inserted horizontally into the inner hole of the first sliding copper sleeve 6 in the first through hole 103 of the bushing body 1, and the radial helical rod 4 is rotated clockwise so that the external thread of the conical end face M22X1.5 of the radial helical rod 4 is screwed into the corresponding internal thread hole on the first adjusting key plate 2, and its Ф18 conical end face is flush with or slightly concave with the working surface of the first adjusting key plate 2 to prevent the roller journal from being blocked when inserted into the bushing body 1. Simultaneously, another key adjusting component, the radial spiral sleeve 5, is inserted horizontally into the inner hole of the second sliding copper sleeve 9 in the second through hole 104 of the bushing body 1, and the radial spiral sleeve 5 is rotated counterclockwise so that the Ф42X15 stepped surface with an annular oil groove at one end of the radial spiral sleeve 5 contacts the outer wall of the bushing body 1. At this time, the left-hand M33X1.5 external thread at the other end of the radial spiral sleeve 5 has been screwed into the corresponding internal thread hole on the second adjusting key plate 3, and its end face is kept flush with or slightly concave with the working surface of the second adjusting key plate 3 to prevent the roller journal from being obstructed when inserted into the bushing body 1.

[0065] Next, the roll is moved laterally under the push of the mill's lateral hydraulic cylinder, allowing the roll journal to be inserted horizontally into the inner hole of the bushing body 1 and assembled in place. At this time, the center of the radial through hole of Ф36 on the roll journal coincides with the center line of the internal threaded hole of M22X1.5 / M33X1.5 on the first adjusting key plate 2 and the second adjusting key plate 3, which facilitates the radial helical rod 4 to radially pass through the flat square bearing surface of the roll journal in the next step. Further rotate the radial helical rod 4 clockwise so that the M22X1.5 external thread on its conical end face passes through the working surface of the first adjusting key plate 2 and continues to penetrate radially. After passing through the radial through hole of Ф36 on the roll journal, it is finally inserted into the inner hole of the radial helical sleeve 5 until the Ф34X10 positioning cone end face on the radial helical rod 4 contacts the Ф32 positioning recess on the first sliding copper sleeve 6. At this time, the radial helical rod 4 passes through the flat bearing surface of the roll journal and is inserted into the inner hole of the radial helical sleeve 5. Finally, it passes through the Ф42 large end face of the radial helical sleeve 5. One end of the radial helical rod 4, with an M22X1.5 and a 24mm long conical external thread, is exposed outside the radial helical sleeve 5, and the center line of the radial through conical pin hole on its outer surface coincides with the center line of the conical pin hole on the radial helical sleeve 5.

[0066] Finally, the conical nut 12 is radially inserted into the conical pin holes of the radial helical rod 4 and the radial helical sleeve 5, and an M8 nut is used to prevent loosening and backlash, so that the two are combined into one, forming a double-helix sliding helical adjustment mechanism with left and right helical threads, which can rotate synchronously. Then, the second locking nut 11 is screwed onto the M22X1.5, 24mm long conical external thread at one end of the radial helical rod 4, so that it contacts the Ф42 outer circle end face on the radial helical sleeve 5, so that the lower bottom surface of the radial helical sleeve 5 with the annular oil groove Ф42X15 is pressed against the outer surface of the bushing body 1.

[0067] Next, an Allen wrench is inserted into the specially designed hexagonal groove on one end face of the radial helical rod 4 and rotated clockwise (Note: the hexagonal grooves on both the upper and lower ends of the radial helical rod 41 can be adjusted, achieving the same effect. When adjusting the radial helical rod 4 component individually, the radial helical sleeve 5 can be driven synchronously under the connection of the round nut and conical pin 12, so that both rotate synchronously in the same direction). At this time, the first adjusting key plate 2 and the second adjusting key plate 3, which are mirror-symmetrically arranged in the inner cavity groove of the bushing body 1, will slide synchronously in opposite directions in the inner cavity groove of the bushing body 1 under the action of the axial thrust inside the "double-rotation sliding helix". This increases or decreases the radial linear distance between the working surfaces of the first adjusting key plate 2 and the second adjusting key plate 3, thereby achieving radial clamping of the flat square bearing surface of the roll journal. The magnitude of the clamping force depends entirely on the magnitude of the external torque acting on the radial helical rod 4. Simultaneously, the external torque acting on the radial helical rod 4 and the radial helical sleeve 5 causes the double-helix sliding helical mechanism to undergo axial elastic deformation and pre-tightening, eliminating the tooth flank clearance of the threaded pair and improving the clamping rigidity and reliability of the two adjusting key plates. After the above pre-tightening adjustment is completed, while applying the external torque to maintain the elastic axial deformation of the radial helical rod 4 and the radial helical sleeve 5, immediately screw the two locking nuts onto the radial helical rod 4, and ensure that the lower bottom surface of the locking nuts is in close contact with the outer wall of the bushing body 1 to press and lock it in place, preventing it from loosening. At this time, the working surfaces of the two sets of adjusting key plates will firmly and reliably contact and hold the flat bearing surface of the roll journal, realizing a large interference fit and tight connection between the two, and synchronously and accurately transmitting the rolling torque output by the reducer. When the mill rotates, the internal axial preload in the double-rotation sliding screw mechanism in the bushing body 1 provides a sufficiently large bidirectional symmetrical clamping force, increases the critical static friction value on the flat bearing surface of the roll journal, and ensures that the "axial insertion assembly" formed by the roll journal and the bushing body 1 maintains a tight fit and sufficient rotational stiffness, and transmits the rolling torque.

[0068] After completing all the above pre-tightening adjustment steps, production can begin. The rolls will be held by two adjustment key plates and will transmit rolling torque through the inner cavity groove sidewall of the bushing body 1 and the cross universal joint connected to the bushing body 1.

[0069] In the second working condition, when production is stopped for maintenance or when the roll is replaced, the roll journal needs to be pulled out axially from the bushing body 1.

[0070] First, manually rotate the bushing body 1 so that the radial helical rod 4 and the radial helical sleeve 5 are both horizontal relative to the ground. At this time, the two adjusting key plates are vertical relative to the ground. Then, rotate counterclockwise to loosen the four locking nuts at both ends of the radial helical rod 4, unload the axial preload superimposed on the radial helical rod 4 and the radial helical sleeve 5, so that they eliminate internal elastic force and elastic deformation, and at the same time remove the nut tapered pin 12.

[0071] Secondly, while continuing to rotate the radial helical rod 4 counterclockwise, pull it radially outward along the bushing body 1. Relying on the internal axial force of the threaded pair in the sliding helical mechanism, the radial helical rod 4 is radially screwed out along the inner hole of the radial helical sleeve 5 until the Ф18 tapered end face of the radial helical rod 4 is flush with or slightly concave to the working surface of the radial adjusting key plate. This achieves radial separation between the working surface of the first adjusting key plate 2 and the flat bearing surface of the contacting roll journal, and causes the radial helical rod 4 to disengage from the Ф36 through hole of the roll journal. Immediately afterwards, use an adjustable wrench to hold the outer hexagonal shoulder of the radial helical sleeve 5 and rotate it clockwise, so that the left-hand M33X1.5 external thread of the other end of the radial helical sleeve 5 is screwed out of the corresponding internal thread hole on the second adjusting key plate 3, while keeping its end face flush with or slightly concave to the working surface of the second adjusting key plate 3. At this time, the working surface of the second adjusting key plate 3 will disengage from the other flat bearing surface of the roll journal it contacts, changing the fit between the roll journal and the shaft hole of the bushing body 1 from a large interference fit during rolling to a large clearance fit during roll changing. This facilitates the mill's transverse hydraulic cylinder to flexibly pull the roll axially out of the bushing body 1. Note: The radial helical rod 4 and the radial helical sleeve 5 should not be completely unscrewed from the internal thread holes of the first adjusting key plate 2 and the second adjusting key plate 3. They only need to be rotated to slightly avoid the two flat bearing surfaces of the roll journal. This prevents the first adjusting key plate 2, the second adjusting key plate 3, the radial helical rod 4, and the radial helical sleeve 5 from falling radially off the bushing body 1. It also prepares the mill for the subsequent axial insertion and clamping of the new roll journal into the roll bushing after roll changing, shortening the roll changing time and improving the roll changing efficiency.

[0072] Finally, the flat bearing surface of the roll journal separates from the working surface of the adjusting key plate in the bushing body 1, creating a clearance between them. This breaks the original interference fit and forms a loose fit with a large clearance, facilitating the axial pull-out of the mill stand, disengaging it from the mill train transmission system, and completing the roll changing action. The mill lateral hydraulic cylinder can be used to axially pull the roll out of the inner hole of the bushing body 1, completing the roll changing action and preparing for the next axial insertion and assembly on the mill line.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, the terms "front," "back," "left," "right," "upper," and "lower" in this document refer to the placement shown in the accompanying drawings.

[0074] 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sliding spiral synchronous radially adjustable roll bushing, characterized in that, include: The bushing body has two grooves arranged symmetrically in the inner cavity, and a radial through hole is provided on the bushing body at the position corresponding to the groove. Adjust the key plate, which is set in the groove with clearance fit, to abut against the flat bearing surface of the journal; A radial helical rod passes through the bushing body, and each end is provided with a threaded section, which respectively engages with one of the adjusting key plates via a threaded connection. The first through hole contains a first sliding copper sleeve, and one end of the radial helical rod passes through the first adjusting key plate and the first sliding copper sleeve by a threaded connection. The other end of the radial helical rod is fitted with a radial helical sleeve, the outer wall of which is provided with a threaded section. The second through hole contains a second sliding copper sleeve, and the radial helical sleeve passes through the second adjusting key plate and the second sliding copper sleeve by a threaded connection. Furthermore, the threaded section of the radial helical rod and the threaded section of the radial helical sleeve rotate in opposite directions.

2. The sliding spiral synchronous radial adjustment roll sleeve according to claim 1, characterized in that, A first elastic retaining ring is provided inside the first perforation at the end of the first sliding copper sleeve.

3. The sliding spiral synchronous radial adjustment roll bushing according to claim 2, characterized in that, The end of the radial helical rod located outside the first perforation is fitted with a first locking nut.

4. The sliding spiral synchronous radial adjustment roll sleeve according to claim 1, characterized in that, The radial helical sleeve and the radial helical rod are connected by a transverse nut tapered pin.

5. The sliding spiral synchronous radial adjustment roll bushing according to claim 4, characterized in that, A second elastic retaining ring is provided at the end of the second sliding copper sleeve inside the second perforation.

6. The sliding spiral synchronous radial adjustment roll sleeve according to claim 5, characterized in that, The radial helical rod is fitted with a second locking nut at the part outside the second through hole.

7. The sliding spiral synchronous radial adjustment roll sleeve according to claim 1, characterized in that, The groove depth is 2mm greater than the thickness of the adjustment key plate, so that the radial sliding distance of the adjustment key plate on one side is 1-2mm.

8. The sliding spiral synchronous radial adjustment roll sleeve according to claim 1, characterized in that, Both ends of the radial helical rod are provided with internal hexagonal grooves.

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