A strip steel throw type pinch roll passive roller support box

Abstract

The application relates to the technical field of a support box, and relates to a steel strip throwing and separating type pinch roll passive roller support box, which comprises a shaft body and a shaft sleeve, the outer wall of the shaft body is rotationally connected with the shaft sleeve, a bearing is installed at the lower end of the shaft body, the lower end of the shaft body is rotationally connected with a bottom shaft sleeve, the outer wall of the upper end of the shaft body is rotationally connected with a top shaft sleeve, and the outer wall of the shaft sleeve is connected with a limiting mechanism. The main box body and the auxiliary box body of the support box mechanism are spliced in half, the circular blocks are quickly positioned, the auxiliary box body can be separated by only loosening the middle connecting bolts, the whole machine does not need to be disassembled, the core components such as the shaft body and the bearing can be directly taken out, the top shaft sleeve and the bottom shaft sleeve are respectively screw-threadedly assembled with the two split box bodies, the limiting ring and the top block of the limiting mechanism can be separately disassembled and adjusted to pre-tighten, the components are independently disassembled and assembled, the bearing is replaced and the shafting gap is adjusted, the operation is simple, the rolling mill downtime during maintenance is significantly shortened, and the continuous operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of support box bodies, specifically to a passive roller support box body for strip steel splitting pinch rollers. Background Technology

[0002] In cold-rolled and hot-rolled strip steel production lines, the splitting pinch rolls are used to convey and cut strip steel. The passive rolls rotate synchronously by relying on the friction of the strip steel. The support box is the core load-bearing component that supports the roller shaft and bearings. The traditional integrated support box is cumbersome to disassemble and assemble. When inspecting the bearings and roller shafts, the entire box needs to be disassembled, resulting in long downtime for maintenance.

[0003] While existing improved hot-rolled narrow strip steel pinch roll devices have solved the problem of poor load-bearing capacity of the active vertical shaft bearing, the aforementioned improved devices rely solely on a few bolts at the bottom for single-point fixation of the housing, lacking side locking surfaces. This makes them prone to loosening and shaking under strip impact. The integrated housing prevents separate adjustment of bearing clearance, leading to excessive shaft clearance and vibration after operation, affecting strip conveying stability. Furthermore, the inability to disassemble the housing for individual bearing and seal replacement necessitates complete shutdown and disassembly for even minor component damage, resulting in a large maintenance workload and severely hindering continuous operation efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that the existing improved hot-rolled narrow strip steel pinch roll device has a large maintenance workload, which seriously restricts the efficiency of continuous operation. Therefore, a passive roll support box for strip steel throwing pinch roll is proposed.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a passive roll support housing for a strip steel splitting pinch roll, comprising a shaft body and a bushing, wherein the outer wall of the shaft body is rotatably connected to the bushing, a bearing is installed at the lower end of the shaft body, the lower end of the shaft body is rotatably connected to the bottom bushing, the outer wall of the upper end of the shaft body is rotatably connected to the top bushing, and a limit mechanism is connected to the outer wall of the bushing.

[0006] This setting: The shaft body is the main shaft of the pinch roller passive roller. The shaft body is wrapped in layers of bushing, top bushing, and bottom bushing. The bearing bears the rotational load of the main shaft. The limiting mechanism applies a clamping and positioning force from the outside of the bushing to restrict the axial movement of the shaft body and reduce the running clearance.

[0007] Preferably, the limiting mechanism includes a limiting ring, the inner wall of which is threadedly connected to a bushing by bolts, the inner wall of which has a square groove, the inner wall of which is inserted into a top block, the outer wall of which is fixedly connected to a sloped top plate, and the outer wall of which is inserted into a positioning ring.

[0008] This feature includes: the limit ring bolt is locked to the outside of the bushing; the square groove provides lateral limit to the top block; the sloped top plate structure allows for fine-tuning of the tightening; the positioning ring prevents the top block from loosening; and the entire limit assembly can be disassembled and assembled independently, facilitating on-site adjustment of the preload.

[0009] Preferably, the upper end of the slope top plate abuts against the top shaft sleeve, and the outer wall of the top shaft sleeve is connected to a support box mechanism.

[0010] This feature: The sloping top plate presses upward against the top bushing, eliminating the clearance between the top bushing and the housing and shaft body, suppressing the main shaft wobbling. The support housing mechanism adopts a split structure, which facilitates quick and easy opening of the cover to inspect the roller shaft and bearings.

[0011] Preferably, the support housing mechanism includes a main housing and a secondary housing. The inner wall of the upper end of the main housing is threadedly connected to the top shaft sleeve, the inner wall of the upper end of the secondary housing is threadedly connected to the top shaft sleeve, the inner wall of the middle part of the main housing is threadedly connected to the secondary housing by bolts, the outer wall of the main housing is fixedly connected to a circular block, and the outer wall of the circular block is inserted into the secondary housing.

[0012] This configuration features a main and auxiliary housing that are split in half, secured by bolts in the middle, with round blocks for positioning and insertion. During assembly and disassembly, the main housing does not need to be completely disassembled; the roller assembly can be removed directly by separating the auxiliary housing, significantly reducing downtime for maintenance. The top and bottom bushings are threaded at the top and bottom ends respectively, ensuring secure bushing positioning.

[0013] Preferably, the inner wall of the lower end of the main housing is threadedly connected to the bottom shaft sleeve, and the inner wall of the lower end of the auxiliary housing is threadedly connected to the bottom shaft sleeve.

[0014] This feature: The bottom bushing is clamped and positioned by the main and auxiliary housings, and the upper and lower bushings form a complete support constraint, resulting in uniform force on the shaft body and higher rotational stability.

[0015] Preferably, the outer wall of the bearing abuts against the main housing and the auxiliary housing.

[0016] This feature: The bearing outer ring is clamped and fixed by the housing to prevent slippage, reduce bearing wear rate, and extend bearing service life.

[0017] Preferably, the inner wall of the main housing is machined with a circular groove.

[0018] This setting: The circular groove provides abutment space for the sloping top plate, limits the clamping stroke of the sloping top plate, and prevents excessive clamping from causing deformation of the bushing and jamming of the main shaft.

[0019] Preferably, the outer wall of the rear end of the slope top plate abuts against the circular groove.

[0020] This setting: The sidewall of the circular groove limits the slope of the top plate, ensuring that the clamping force acts vertically on the top sleeve, the force direction is stable, and the top block will not shift or fail.

[0021] Preferably, the lower end of the main housing is machined with fixing holes.

[0022] This feature allows for easy installation and positioning of the entire support box body by bolting it onto the rolling mill frame through fixing holes, ensuring reliable load-bearing and fixation of the entire machine.

[0023] Preferably, the outer wall of the sub-box is machined with heat dissipation holes.

[0024] This setting allows the heat generated during bearing operation to be quickly dissipated to the outside of the housing through the heat dissipation holes, preventing heat buildup inside the housing from causing the bearing grease to overheat and fail, thus reducing the bearing's operating temperature.

[0025] The present invention proposes a passive roll support box for strip steel splitting pinch rolls, which has the following advantages: the main box and the auxiliary box of the support box mechanism are spliced ​​in half, and the round blocks are quickly aligned. The auxiliary box can be separated by loosening the middle connecting bolts. The core components such as the shaft body and bearings can be directly removed without disassembling the whole machine. The top shaft sleeve and the bottom shaft sleeve are respectively threaded and separately assembled with the two box parts. The limiting ring and the top block of the limiting mechanism can be disassembled and the preload can be adjusted separately. Each component can be disassembled and assembled independently, and the operation of replacing bearings and adjusting shaft clearance is simple. This significantly shortens the downtime of the rolling mill for maintenance and improves the efficiency of continuous operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the main and auxiliary housing structures; Figure 3 for Figure 1 Schematic diagram of the main housing and limiting mechanism assembly; Figure 4 for Figure 1 Schematic diagram of the middle and auxiliary box structure; Figure 5 for Figure 1 Schematic diagram of the middle limit mechanism; Figure 6 for Figure 4 Schematic diagram of the exploded structure of the middle limit mechanism; Figure 7 for Figure 1 Schematic diagram of the central shaft body and bushing structure.

[0027] In the diagram: 1. Shaft body, 2. Shaft sleeve, 3. Bearing, 4. Bottom shaft sleeve, 5. Top shaft sleeve, 6. Limiting mechanism, 601. Limiting ring, 602. Square groove, 603. Top block, 604. Sloping top plate, 605. Positioning ring, 7. Support box mechanism, 701. Main box, 702. Secondary box, 703. Round block, 8. Round groove, 9. Fixing hole, 10. Heat dissipation hole. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings: Please see Figure 1-7 In this embodiment, a passive roll support box for strip splitting pinch rolls includes a shaft body 1 and a bushing 2. The outer wall of the shaft body 1 is rotatably connected to the bushing 2. A bearing 3 is installed at the lower end of the shaft body 1, and the lower end of the shaft body 1 is rotatably connected to the bottom bushing 4. The outer wall of the upper end of the shaft body 1 is rotatably connected to the top bushing 5. A limiting mechanism 6 is connected to the outer wall of the bushing 2. This embodiment is a preferred implementation solution for cold-rolled 1.0–12mm carbon steel and stainless steel strip splitting production lines. The entire box, bushing, and limiting components are uniformly cast from QT500-7 ductile iron, which can balance structural rigidity and shock absorption performance under the high-temperature operating environment of the rolling mill.

[0029] The shaft body 1 is made of 40Cr alloy steel and undergoes overall quenching and tempering. The outer cylindrical surface of the shaft is high-frequency quenched, and the finished product hardness is stably maintained in the range of HRC42-48, which greatly improves wear resistance and impact resistance. The bearing 3 is equipped with double row self-aligning roller bearings, which can withstand the radial impact load generated during the high-speed conveying of strip steel. The entire structure can meet the on-site use requirements of 24-hour uninterrupted continuous production of the rolling mill. The selection of parts, processing parameters, and assembly process are complete and clear. Mechanical assembly personnel in the industry can complete the equipment processing and assembly according to this solution.

[0030] The limiting mechanism 6 includes a limiting ring 601. The inner wall of the limiting ring 601 is threadedly connected to the bushing 2 by bolts. The inner wall of the limiting ring 601 has a square groove 602. The inner wall of the square groove 602 is inserted into the top block 603. The outer wall of the top block 603 is fixedly connected to the slope top plate 604. The top block 603 supports the slope top plate 604 and, together with the square groove 602, limits the lateral position to prevent the slope top plate from shifting horizontally during the tightening process and ensures the stability of the force direction. The outer wall of the slope top block 603 is inserted into the positioning ring 605. The limiting ring 601 adopts an integrated annular flange structure. Four sets of M12 mounting threaded holes are evenly opened in the circumference of the ring body. It is locked and fixed to the reserved positioning step on the outer circle of the bushing 2 with 8.8 grade high-strength internal hex bolts. After locking, it can completely fit the outer circle of the bushing and there will be no problem of local suspension and loosening.

[0031] The square groove 602 is a through rectangular groove. The width of the groove is 0.15mm reserved on each side of the top block 603 for standard assembly clearance. This clearance can ensure that the top block 603 can slide slightly along the groove and flexibly adjust the clamping stroke, while also restraining the left and right offset of the top block 603 in all directions. The slope angle of the top plate 604 is set at 12°. This angle was obtained through multiple rounds of on-site working condition comparison tests. If the angle is too small, the pre-tightening adjustment stroke will be insufficient and the shaft clearance cannot be completely eliminated. If the angle is too large, it will generate excessive lateral force, which will easily cause the top block to slip off and the clamping failure.

[0032] The positioning ring 605 adopts an open snap ring structure, which is directly snapped into the pre-set annular slot on the outside of the top block 603. After assembly, it can completely seal the opening on the outside of the square slot 602, effectively preventing iron oxide scale, cooling circulating water and rolling lubricating oil splashed on the steel rolling site from entering the slot, avoiding the accumulation of impurities that cause the top block to slide and jam, and greatly reducing the frequency of daily failures of the limit mechanism.

[0033] The upper end of the slope top plate 604 abuts against the top bushing 5. The outer wall of the top bushing 5 is connected to the support box mechanism 7. The support box mechanism 7 includes a main box 701 and a secondary box 702. The inner wall of the upper end of the main box 701 is threaded to the top bushing 5. The inner wall of the upper end of the secondary box 702 is threaded to the top bushing 5. The inner wall of the middle part of the main box 701 is threaded to the secondary box 702 by bolts. The outer wall of the main box 701 is fixedly connected to the round block 703. The round block 703 is used to install and position the main box 701 and the secondary box 702. During disassembly and assembly, the mating surfaces can be quickly aligned without repeated adjustments, reducing assembly time.

[0034] The mating surfaces of the main housing 701 and the auxiliary housing 702 are precision CNC milled, with the flatness tolerance strictly controlled within 0.02mm. A 2mm thick high-temperature and oil-resistant fluororubber sealing gasket is installed between the mating surfaces of the two halves of the housing. The sealing gasket can prevent external cooling water and emulsion from seeping into the housing and prevent the bearing grease from being diluted and failing. The positioning block 703 is press-fitted with the main housing 701 and reinforced by spot welding. The outer circle of the block is chamfered, which can serve as a guide when disassembling and assembling the auxiliary housing. The workers can complete the housing alignment by one person without the need for multiple people. The upper and lower ends of the main and auxiliary housings are reserved with internal threaded holes for matching top bushing 5 and bottom bushing 4. The thread accuracy is 6H standard. After the bushings are screwed in, they can form a uniform circumferential support, dispersing the load transmitted by the shaft body during operation and avoiding local stress concentration that could cause the housing to crack and deform.

[0035] The main housing 701 and the auxiliary housing 702 of the support housing mechanism 7 are spliced ​​in half and quickly aligned by the round block 703. The auxiliary housing 702 can be separated by loosening the middle connecting bolt. The core components such as the shaft body 1 and bearing 3 can be directly removed without disassembling the whole machine. The top shaft sleeve 5 and the bottom shaft sleeve 4 are respectively threaded and separately assembled with the two housings. The limiting ring 601 and the top block 603 of the limiting mechanism 6 can be disassembled and the preload adjusted separately. Each component can be disassembled and assembled independently, and the operation of replacing bearings and adjusting shaft clearance is simple, which significantly shortens the downtime of the rolling mill for maintenance and improves the efficiency of continuous operation.

[0036] Traditional integrated pinch roll support housings require the removal of all bottom fixing bolts and the entire housing during maintenance. A single bearing replacement operation takes at least 2-3 hours of downtime. This solution, however, only requires the removal of 4 sets of connecting bolts in the middle of the housing for the semi-split housing. A single person using a socket wrench can separate the secondary housing within 10 minutes, directly exposing the internal shaft body and bearing assembly. There is no need to disassemble the bottom fixing structure of the housing or use overhead crane equipment, allowing maintenance to be completed even in the confined space of the rolling mill stand. The top and bottom bushings are separately threaded to the main and secondary housings, respectively. During maintenance, a single bushing can be unscrewed, eliminating the need to disassemble the entire upper and lower support structure. For localized faults such as bushing wear or thread damage, only the corresponding bushing needs to be replaced, eliminating the need for complete replacement parts and reducing equipment maintenance material costs.

[0037] The inner wall of the lower end of the main housing 701 is threaded to the bottom bushing 4, and the inner wall of the lower end of the auxiliary housing 702 is also threaded to the bottom bushing 4. The outer wall of the bearing 3 abuts against the main housing 701 and the auxiliary housing 702. The inner wall of the main housing 701 is machined with a circular groove 8, and the outer wall of the rear end of the sloped top plate 604 abuts against the circular groove 8. The lower end of the main housing 701 is machined with a fixing hole 9, and the outer wall of the auxiliary housing 702 is machined with a heat dissipation hole 10. Limiting bosses are provided at the upper and lower ends of the bottom bushing 4. After the two halves of the housing clamp the bottom bushing, the bosses can restrict the axial movement of the bottom bushing, forming a bidirectional constraint with the upper top bushing, so that the upper and lower ends of the shaft body 1 are evenly stressed, and there will be no up-and-down swinging during high-speed rotation.

[0038] The outer ring of bearing 3 is fully fitted with the semi-circular clamping groove of the main and auxiliary housings. The groove wall of the housing can lock the outer ring of the bearing, preventing the outer ring of the bearing from slipping relative to the housing, reducing abnormal wear between the bearing rollers and raceways, and extending the bearing service life by more than 30%. The inner circular groove 8 of the main housing adopts an arc transition inner wall, which can evenly bear the pressure of the back end of the sloped top plate, avoiding stress concentration at the corners and cracking of the housing.

[0039] The main housing has multiple sets of fixing holes 9 arranged in a matrix at the bottom to accommodate different specifications of the rolling mill frame mounting base. The fixing points can be flexibly adjusted according to the reserved holes on the frame at the site. The auxiliary housing has multiple sets of long strip-shaped heat dissipation holes 10 arranged in an equidistant array on the outer wall. The holes are tilted inward at 15°, which can quickly dissipate the heat generated by the bearings inside the housing and prevent external splashing steel slag and large debris from falling directly into the housing.

[0040] Working principle Assembly process First, the bearing 3 and the bottom bushing 4 are sequentially fitted onto the lower end of the shaft body 1. The bushing 2 is fitted onto the outer side of the shaft body 1, and the top bushing 5 is assembled at the top. The limiting mechanism 6 is assembled, and the limiting ring 601 is locked to the outer wall of the bushing 2 with bolts. The top block 603 is embedded into the square groove 602 of the limiting ring, and a positioning ring 605 is added to the outer side for limiting. The slope top plate 604 is fixed to the front end of the top block 603. Then, the support box mechanism 7 is assembled. The main box 701 and the auxiliary box 702 are aligned and fitted together by the round block 703, and the middle bolt is locked. The top bushing 5 and the bottom bushing 4 are respectively threaded onto the upper and lower ends of the box. The bearing 3 is clamped between the two boxes. The rear end of the slope top plate 604 abuts into the round groove 8 of the main box. Finally, the entire box is fixed to the rolling mill frame using the fixing hole 9 at the bottom of the main box. The auxiliary box 702 has multiple sets of heat dissipation holes 10 reserved, and the entire assembly is completed. The entire assembly process is divided into four main steps: shaft pre-assembly, limit mechanism assembly, housing mold closing, and overall frame fixing. The steps are clearly defined, and novice assemblers can operate step by step by referring to the attached diagrams.

[0041] During the pre-assembly stage of the shaft body, high-temperature lithium-based grease should be evenly applied to the inner ring of the bearing and the inner wall of the bushing. The grease filling amount should be controlled to 60% of the internal cavity of the bearing. Excessive filling will cause overheating during operation, while insufficient filling will cause dry grinding and abnormal noise. When assembling the limiting mechanism, the slope top plate, top block, and positioning ring should be pre-assembled into a whole first, and then the limiting ring square groove should be inserted. After assembly, the top block should be manually moved to confirm that the sliding is smooth and without jamming before tightening the limiting ring bolts. Before the housing is closed, a small amount of lubricating grease should be applied to the inner wall of the circular groove of the main housing to reduce the friction loss when the slope top plate is tightened back and forth. The sealing gasket of the mating surface should be completely and flatly laid in the mating groove of the main housing without wrinkles or displacement to prevent oil leakage due to sealing failure. During the frame fixing stage, high-strength anti-loosening bolts should be matched with the bottom fixing holes. After all bolts are tightened, spring washers should be added to resist the vibration generated by the impact of the strip steel and prevent the bolts from loosening during long-term operation.

[0042] Usage process During strip steel production, the shaft body 1 acts as the passive roller spindle, rotating synchronously with the strip steel. The bearing 3 bears the radial load of rolling. The top shaft sleeve 5 and bottom shaft sleeve 4 provide support for the shaft body from top to bottom. The sloped top plate 604 continuously presses against the top shaft sleeve 5 to eliminate the clearance in the shaft system. The combination of the limiting ring 601 and the top block 603 constrains the axial movement of the shaft body, preventing the strip steel from deviating during conveying. The heat dissipation holes 10 on the outer wall of the auxiliary housing continuously dissipate the heat generated by the bearing operation, preventing the lubricating grease from failing at high temperatures and extending the service life of the bearing. During equipment maintenance, only the middle bolt needs to be loosened, and the auxiliary housing 702 needs to be separated to directly remove the shaft body 1, bearing 3, and other components, significantly shortening downtime. If shaft system sway occurs during long-term operation, the limiting ring 601 can be removed, the tightening force of the sloped top plate 604 can be adjusted, and the clearance can be eliminated again. The overall split housing structure is easy to disassemble and assemble, the limiting mechanism is stable and reliable, and the heat dissipation design is adapted to the high-temperature conditions of steel rolling, ensuring smooth strip steel conveying and long-term stable operation of the equipment.

[0043] In the process of strip steel rolling and conveying, the instantaneous impact load is generated when the strip steel is thrown at the head and tail. Traditional integrated box-type structures with no clearance adjustment will have the shaft clearance continuously expand after long-term impact, resulting in production defects such as lateral deviation, surface indentation, and excessive deviation of the throwing size of the strip steel. This structure relies on the sloped top plate to continuously tighten the top bushing, and compensates for the clearance caused by the wear of the bushing and bearing in real time. The strip steel is always stably and closely conveyed during the process, and the throwing size error can be controlled within ±0.2mm, which greatly improves the qualified rate of finished strip steel.

[0044] The continuous high-speed operation of the bearings inside the housing generates a large amount of heat. The heat accumulation in the enclosed housing can cause the grease to carbonize at high temperatures and lose its lubricating effect. The array of heat dissipation holes in the auxiliary housing can form a natural convection airflow channel, reducing the internal temperature rise of the housing by 15℃–22℃ compared to traditional enclosed housings, effectively delaying grease aging. Routine maintenance and clearance adjustment do not require disassembling the housing. Simply loosen the limit ring bolts to pull out the top block to adjust the slope and the extension of the top plate. After adjustment, tighten the bolts again. The entire process does not require stopping the machine to remove the roller system. When encountering faults such as bearing sintering or bushing scoring, the damaged parts can be directly replaced after separating the auxiliary housing. There is no need to dismantle the entire support housing to realign the installation benchmark. The downtime of the rolling line is greatly reduced, and the effective production time of the rolling mill is significantly improved, which is suitable for the long-term stable operation requirements of continuous, high-load strip steel production lines.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A passive roll support housing for a strip steel splitting pinch roll, comprising a shaft body (1) and a bushing (2), wherein the outer wall of the shaft body (1) is rotatably connected to the bushing (2), characterized in that: The lower end of the shaft body (1) is connected to a bearing (3), the lower end of the shaft body (1) is rotatably connected to a bottom bushing (4), the outer wall of the upper end of the shaft body (1) is rotatably connected to a top bushing (5), and the outer wall of the bushing (2) is connected to a limit mechanism (6).

2. The passive roll support housing for the strip splitting pinch roll according to claim 1, characterized in that: The limiting mechanism (6) includes a limiting ring (601), the inner wall of the limiting ring (601) is threadedly connected to the bushing (2) by bolts, the inner wall of the limiting ring (601) is machined with a square groove (602), the inner wall of the square groove (602) is inserted into the top block (603), the outer wall of the top block (603) is fixedly connected to the slope top plate (604), and the outer wall of the top block (603) is inserted into the positioning ring (605).

3. The passive roll support housing for the strip splitting pinch roll according to claim 2, characterized in that: The upper end of the slope top plate (604) abuts against the top shaft sleeve (5), and the outer wall of the top shaft sleeve (5) is connected to the support box mechanism (7).

4. The passive roll support housing for the strip splitting pinch roll according to claim 3, characterized in that: The support box mechanism (7) includes a main box (701) and a secondary box (702). The inner wall of the upper end of the main box (701) is threadedly connected to the top shaft sleeve (5). The inner wall of the upper end of the secondary box (702) is threadedly connected to the top shaft sleeve (5). The inner wall of the middle part of the main box (701) is threadedly connected to the secondary box (702) by bolts. The outer wall of the main box (701) is fixedly connected to the round block (703). The outer wall of the round block (703) is inserted into the secondary box (702).

5. The passive roll support housing for the strip splitting pinch roll according to claim 4, characterized in that: The inner wall of the lower end of the main housing (701) is threaded to the bottom bushing (4), and the inner wall of the lower end of the auxiliary housing (702) is threaded to the bottom bushing (4).

6. The passive roll support housing for the strip splitting pinch roll according to claim 1, characterized in that: The outer wall of the bearing (3) abuts against the main housing (701) and the auxiliary housing (702).

7. The passive roll support housing for the strip splitting pinch roll according to claim 4, characterized in that: The inner wall of the main housing (701) is machined with a circular groove (8).

8. The passive roll support housing for the strip splitting pinch roll according to claim 2, characterized in that: The outer wall of the rear end of the slope top plate (604) abuts against the circular groove (8).

9. The passive roll support housing for the strip splitting pinch roll according to claim 4, characterized in that: The lower end of the main housing (701) is machined with fixing holes (9).

10. The passive roll support housing for the strip splitting pinch roll according to claim 4, characterized in that: The outer wall of the sub-box (702) is machined with heat dissipation holes (10).

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