Method for installing top roller of annealing furnace for stainless steel bright plate and structure of top roller

Abstract

The application discloses a stainless steel bright plate annealing furnace top roller mounting method and a furnace top roller mounting structure, and at least comprises the following steps: processing at least one sliding groove extending along the axial direction of the operation side of the furnace top roller shaft; installing the transmission side bearing seat bearing; installing the operation side bearing seat bearing, and reserving an axial gap between the inner ring of the operation side bearing seat bearing and the operation side step of the shaft, the size of the axial gap being determined based on the maximum elongation of the thermal expansion of the shaft; installing the ball head top pin in the operation side bearing seat bearing and making the ball head of the ball head top pin enter the sliding groove; processing a fixing structure on the transmission side of the shaft; installing the sharp head top pin in the transmission side bearing seat bearing, and making the sharp head top pin cooperate with the fixing structure to tightly fix the transmission side bearing seat bearing and the shaft. The application can prevent the inner ring of the bearing from being deviated, the bearing from being abnormally axially pressed and the shaft from being deviated.

Description

Technical Field

[0001] This invention relates to a method for installing the top roller of an annealing furnace for stainless steel bright plates and to an installation structure for the top roller. Background Technology

[0002] Although the imported European equipment is excellent, it still has defects. After years of use by the applicant, it was found that the equipment at the furnace top roller is unstable and will be damaged by abnormal conditions. Every few years, it will cause the unit to fail and shut down for a long time. Each time it is dealt with, the economic loss is about 120,000 yuan. The maintenance cost has increased significantly, the failure rate has also increased, and there are also major safety hazards.

[0003] Existing furnace top roller installation methods include the following steps, such as... Figure 1 As shown, specifically: Step 1: Hoist the furnace top roller into the furnace shell box, aligning the mandrel mounting holes on the furnace top roller with the mandrel mounting holes on the furnace shell box; Step 2: Insert the mandrel into the furnace shell from the drive side to the operating side. During this process, insert the tensioning sleeve between the mandrel and the furnace top roller without locking it. Step 3: Insert the expansion joint and sealing bushing into the mandrel and secure them in place; Step 4: Install and secure the P-type belt bearing on the transmission side into place; Step 5: Install the drum gear coupling into place; Step 6: Install the F-type bearing with mounting on the operating side, ensuring the inner ring of the bearing is tightly against the step of the spindle, and tighten it in place; Step 7: Adjust the position of the furnace top roller to the middle of the furnace shell and tighten the tension sleeve; Step 8: Measure and fine-tune the levelness of the furnace top roller surface; Step 9: Install the motor and measure and adjust the coaxiality of the drum gear coupling; Step 10: Install the furnace door and the operating side sealing cover of the bright plate annealing furnace; Step 11: Conduct airtightness testing and treatment of the furnace body.

[0004] The following are the equipment details and assembly information for existing technology: 1. For example Figure 2 As shown, the applicant's No. 2 stainless steel bright plate annealing furnace top roller 2 is located at the top of the furnace body, 50 meters above the ground. Inside its housing 14, there is a straightening roller 1 and a furnace top roller 2. The straightening roller 1 is a passive roller, driven by a hydraulic cylinder 7, which swings back and forth between the operating and transmission sides to correct the deviation. During swinging, it applies an axial force to the furnace top roller 2 behind it. The furnace top roller 2 is an active roller, driven by a motor 8, and fixed to a long mandrel 6 by a tensioning sleeve 12. The mandrel 6 is supported and rotated by a transmission-side bearing 4 and an operating-side bearing 5. The strip steel travels in the direction indicated by mark 3 in the diagram.

[0005] 2. Both bearings on the furnace top roller are mounted bearings. The operating side mounted bearing 5 is type F (vertically installed), and the drive side mounted bearing 4 is type P (horizontally installed). The only difference between the different models is the mounting method of the base. Each bearing has two set screw holes on its inner ring for fixing to the mandrel 6. Currently, flat-head set screws are used. Taking the operating side mounted bearing 5 as an example... Figure 3 As shown, the bearing base 51 is installed vertically and is provided with an inner bearing ring 52 and an outer bearing ring 53. The inner bearing ring 52 has two set screw holes 54.

[0006] 3. Assembly drawing of the top roller of the stainless steel bright plate annealing furnace as shown in the figure. Figure 4 As shown, the furnace top roller 2 extends transversely through the entire housing 14. The tensioning sleeve 12 is inserted between the mandrel 6 and the furnace top roller 2. The expansion joint 11 and the sealing bushing 10 are inserted into the mandrel 6. The transmission side bearing 4 is installed. Further out are the drum gear coupling 9 and the motor 8 used to drive the furnace top roller 2. The operating side bearing 5 is located on the other side of the housing 14, and a sealing cover 13 is installed on its exterior.

[0007] The top rollers for stainless steel bright sheet annealing furnaces manufactured by EBNER have unique features: 1. While ensuring airtightness and simplifying transmission, its structural design significantly increases the complexity of maintenance and disassembly. Because the bright plate annealing furnace is completely sealed and filled with hydrogen, EBNER designed the top roller with a long mandrel running through the furnace body. The power components and support auxiliary components are located on both sides, and two mounted bearings are used. This design effectively ensures furnace airtightness, simplifies the structure, and meets transmission requirements, but it is less convenient for maintenance and disassembly than conventional designs. With conventional designs, the roller can be lifted away along with the bearings and accessories without disassembly or reassembly. However, with the EBNER design, every time the top roller is replaced, all components on the mandrel must be completely disassembled, and each component must be reassembled during installation. Given the large size of equipment in the metallurgical industry, replacing the top roller is extremely laborious.

[0008] 2. The high-altitude and confined working environment of the top roller makes its disassembly and installation extremely difficult. Unlike common horizontal annealing furnaces, the bright plate annealing furnace stands upright on the ground, reaching a height of over 50 meters. The furnace top is 50 meters above the ground, and the surrounding working platform space is small, only accommodating two people at a time. It also prevents the use of more powerful large-scale equipment for disassembly and installation, relying solely on manual labor with small tools. Therefore, the equipment must be easy to disassemble and install, and the assembly difficulty must be low; otherwise, situations may arise where it cannot be disassembled or installed.

[0009] 3. Clearance fit is necessary for ease of maintenance. Due to the aforementioned unique characteristics, EBNER designed the furnace top roller mandrel and seated bearing with a clearance fit based on a hole-basis system to facilitate disassembly and installation. This reduces the pressure of replacing the furnace top roller to some extent. If an interference fit or even a transition fit is used, the mandrel will jam with the furnace top roller, making it impossible to manually remove or install the mandrel. The only solution would be destructive removal using an oxy-acetylene torch, followed by the fabrication of a new spare part. The applicant encountered this situation in 2020 when attempting to resolve equipment issues at the furnace top roller.

[0010] The existing technology has three main drawbacks: 1. Abnormal Axial Compression of Bearings: In EBNER's existing design, the set screws on the bearings with seats on both sides of the mandrel must be tightened to secure the bearing inner ring and the mandrel. High-strength threadlockers are also used for further reinforcement to prevent loosening. Since the furnace heating temperature can reach up to 1150℃, and the temperature inside the furnace top roller housing can reach approximately 150℃, in extreme cases, the temperature difference between the cold and hot states of the furnace top roller can reach approximately 130℃. The mandrel will inevitably elongate due to this heating. Imagine that initially, the set screws on both sides are fixed based on the cold length of the mandrel. However, after the unit operates and the furnace is heated, the mandrel will thermally expand and elongate, inevitably compressing the bearings on both sides. The bearing clearance is at most about 0.1mm, but the elongation of the mandrel far exceeds the clearance. Therefore, the bearings are susceptible to abnormal axial compression, leading to a significant reduction in their lifespan.

[0011] 2. Mandrel Misalignment: Due to the unique design of EBNER's stainless steel bright plate annealing furnace top roller, the mandrel and bearing of the furnace top roller are fitted with a clearance fit. For example... Figure 4 and Figure 5 As shown, the axial positioning of the mandrel relies solely on the friction generated during assembly with the bearing, plus the friction generated by the flat-head set screws of the bearings on both sides. However, the friction generated by assembly and set screws alone is insufficient to fix the mandrel. During operation, the mandrel of the furnace top roller is affected by the axial force applied by the straightening roller, causing it to move back and forth along the axial direction. Observation of the external furnace body reveals that the mandrel sometimes presses against the motor on the transmission side, and sometimes moves away from the motor, turning towards the bearing on the operating side, constantly moving and deviating, making the equipment extremely unstable. This mandrel deviation greatly affects the stable operation of the equipment. Taking the applicant's No. 2 stainless steel bright plate annealing furnace unit as an example, it has caused damage to the operating side bearing twice in the past 5 years. Because the bearing on the operating side is connected to the atmosphere inside the muffle furnace, repairing it requires shutting down the furnace for purging, extinguishing the flame, and cooling down. Each repair results in at least 36 hours of production downtime and energy waste, with economic losses reaching 120,000 yuan.

[0012] 3. Bearing Inner Ring Misalignment: Due to its unique nature, the mandrel and bearing inner ring are inherently clearance-fitted, resulting in minimal friction. The bottom of the set screw is flat, and the contact area between the flat surface and the circular surface of the mandrel is also small, thus generating very little friction. Over long-term operation, the set screw may fail to hold the mandrel in place, leading to bearing misalignment and inner ring slippage. Based on practical experience, multiple disassemblies have revealed set screw marks along the circumference of the mandrel, indicating relative sliding of the set screw on the mandrel. Furthermore, black friction marks on both the bearing inner ring and mandrel surfaces further confirm bearing inner ring misalignment. The bearing inner ring and mandrel should rotate synchronously, but instead, they rotate relative to each other, resulting in sliding friction. Due to the process characteristics of the bright plate annealing furnace, the furnace gas is hydrogen. This phenomenon can cause abnormal heat accumulation, which is extremely dangerous in a hydrogen environment. It can damage equipment, affect the stable operation of the unit, and pose a significant safety hazard.

[0013] Because the top rollers of the stainless steel bright plate annealing furnace manufactured by EBNER have unique characteristics, and the entire equipment is connected to the whole unit and is already fixed, a large-scale demolition and reconstruction plan is not suitable, and the huge modification costs are completely unnecessary. Its uniqueness creates many limitations, and general designs and methods are not applicable here. This problem has affected the equipment user for more than 10 years. The applicant understands that EBNER's foreign personnel have used the same design for the furnace top rollers as they have over a decade ago, indicating that this is also a challenge for them. Therefore, an alternative approach must be sought—a low-cost, simple, easy-to-implement, and effective technology to solve the above three defects. Summary of the Invention

[0014] The first technical problem to be solved by the present invention is to propose a method for installing the top roller of a stainless steel bright plate annealing furnace to prevent the inner ring of the bearing from deviating, in light of the above-mentioned technical status.

[0015] The second technical problem to be solved by the present invention is to propose a method for installing the top roller of a stainless steel bright plate annealing furnace to prevent the bearing from being subjected to abnormal axial compression, in light of the above-mentioned technical status.

[0016] The third technical problem to be solved by the present invention is to propose a method for installing the top roller of a stainless steel bright plate annealing furnace to prevent the mandrel from shifting or deviating, in light of the above-mentioned technical status.

[0017] The fourth technical problem to be solved by the present invention is to provide a top roller mounting structure for a stainless steel bright plate annealing furnace.

[0018] The technical solution adopted by the present invention to solve the first, second and third technical problems mentioned above is: a method for installing the top roller of a stainless steel bright plate annealing furnace, characterized in that it includes at least the following steps: At least one sliding groove extending axially is machined on the operating side of the furnace top roller mandrel; Install a drive-side bearing with a mounting bracket; Install the operating side bearing with a mounting plate, and reserve an axial clearance between the inner ring of the operating side bearing with a mounting plate and the operating side step of the mandrel. The size of the axial clearance is determined based on the maximum thermal expansion elongation of the mandrel. A ball-head set screw is installed in the bearing on the operating side with a mounting seat, and the ball head is made to enter the sliding groove. A fixing structure is machined on the drive side of the mandrel; A pointed set screw is installed in the transmission-side bearing housing. The pointed set screw cooperates with the fixing structure to securely fix the transmission-side bearing housing to the spindle.

[0019] To more accurately design the size of the axial clearance, preferably, the size of the axial clearance is calculated and determined based on the average linear expansion coefficient of the material used for the mandrel in the target temperature range, the length of the mandrel, and the amount of temperature change, and the value of the axial clearance is greater than the thermal expansion elongation of the mandrel due to temperature rise.

[0020] In order for the mandrel to slide more freely within the axial clearance range, the ball head surface of the ball head screw needs to contact the bottom surface of the sliding groove but not be pressed together. Therefore, as a preferred option, when installing the ball head screw, only the minimum preload force that makes the ball head surface contact the bottom surface of the sliding groove is applied.

[0021] To make the fixing structure direct, effective, and low-cost, it is preferable that the fixing structure is a countersunk hole machined on the mandrel, and the tip of the pointed set screw is embedded in the countersunk hole.

[0022] To prevent the set screws from loosening due to insufficient preload, it is preferable to apply thread-locking agent to the threaded portion of the ball-head set screws and the pointed set screws when installing them.

[0023] To more accurately set the position and size of the sliding groove, preferably, the position and size of the sliding groove are determined based on at least the following parameters: the thread specification of the ball head set screw, the distribution angle between set screws, the distance between the operating side step of the mandrel and the operating side shaft end of the mandrel, the axial position of the ball head set screw on the inner ring of the operating side bearing, and the reserved axial clearance between the inner ring of the operating side bearing and the operating side step of the mandrel.

[0024] To further simplify the installation process when replacing the furnace top roller, it is preferable that, when the installation method is first implemented, the steps of machining the sliding groove and machining the fixing structure are performed; during subsequent replacement and maintenance, the already machined sliding groove and fixing structure are directly used for assembly.

[0025] Specifically, the operating side bearing is a vertically mounted F-type bearing, and the transmission side bearing is a horizontally mounted P-type bearing.

[0026] The technical solution adopted by the present invention to solve the fourth technical problem mentioned above is: a furnace top roller mounting structure for a stainless steel bright plate annealing furnace, comprising a core shaft penetrating the furnace body, an operating side bearing with a seat, and a transmission side bearing with a seat, characterized in that... The mandrel has at least one axially extending sliding groove on the operating side; The operating side bearing with seat is provided with a set screw hole, in which a ball-head set screw is installed. The ball head surface of the ball-head set screw contacts the bottom surface of the sliding groove, allowing the spindle to slide axially. The transmission side bearing is provided with a set screw hole, in which a pointed set screw is installed. The pointed end of the set screw is embedded in the corresponding fixing structure on the mandrel to achieve axial fixation.

[0027] Compared with the prior art, the advantages of the present invention are as follows: 1. The ball head surface of the ball screw contacts the bottom surface of the sliding groove. This fit allows the mandrel to slide axially, but prevents relative rotation between the mandrel and the bearing inner ring. Since the bearing inner ring is fixed to the mandrel by the set screw, the possibility of sliding friction between the bearing inner ring and the mandrel is fundamentally eliminated.

[0028] 2. Calculate the maximum elongation of the mandrel at the operating temperature using the thermal expansion formula. When installing the operating side bearing, deliberately leave an axial gap based on the maximum elongation between the inner ring end face of the bearing and the stepped end face of the mandrel. This allows the mandrel to slide freely within the axial gap range when it elongates due to heat, releasing thermal stress without transmitting axial compressive force to the bearings on both sides.

[0029] 3. A fixed structure is machined on the drive side of the spindle. The pointed set screw cooperates with the fixed structure to fasten the drive side bearing to the spindle, effectively limiting the axial movement of the spindle in any direction, thus solving the problem of the spindle moving back and forth due to the axial force applied by the straightening roller. Attached Figure Description

[0030] Figure 1 A flowchart illustrating the installation method of the top roller of the stainless steel bright plate annealing furnace in the prior art; Figure 2 The diagram shows the structure of the top roller box of the stainless steel bright plate annealing furnace in the prior art, with the left figure being the front view and the right figure being the side view. Figure 3 This is a schematic diagram of the operating side bearing structure in the prior art, where the left image is the front view and the right image is the side view; Figure 4 An assembly diagram of the top roller of a stainless steel bright plate annealing furnace in the prior art; Figure 5 This is a flowchart of the furnace top roller installation method according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the assembly structure of the operating side mounted bearing (bearing model UCF326) according to an embodiment of the present invention, wherein the left figure is the front view and the right figure is the side view; Figure 7 for Figure 6 A partially enlarged view of the assembly structure of the ball head set screw at point A; Figure 8 This is an assembly drawing of the furnace top roller mounting structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the assembly structure of the transmission side bearing (bearing model UCP328) according to an embodiment of the present invention; Figure 10 for Figure 9 A magnified view of the pointed top screw assembly structure at point B. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figures 5-10 The figure shown is a preferred embodiment of the stainless steel bright plate annealing furnace top roller installation method and furnace top roller installation structure of the present invention.

[0033] In this embodiment, the No. 2 bright plate annealing furnace unit, which the applicant has used for many years, is taken as an example.

[0034] The installation method of the furnace top roller is a complete process, such as... Figure 5 As shown in the flowchart, for clarity, the applicant has distinguished between "this invention" and "prior art" in the flowchart annotations, and specifically pointed out that the area displayed in the red box is the content of this invention, which is an innovative point that surpasses the prior art.

[0035] This embodiment designs different processes for first-time installation and non-first-time installation. Please refer to the flowchart for details. The specific content of each step is as follows: Step 1 (Invention): ① By using a milling machine, two sliding grooves 61 are pre-cut on the operating side of the furnace top roller mandrel 6. The position of the sliding grooves 61 corresponds to the two set screw holes 54 of the bearing 5 on the operating side. During installation, the two ball head set screws 55 are screwed into the sliding grooves 61. The ball head set screws 55 can prevent the furnace top roller mandrel 6 from rotating relative to each other, which can fundamentally eliminate the defect of the bearing inner ring 52 going astray.

[0036] ② Machining the two sliding grooves 61 of the furnace top roller mandrel 6: Referring to the bearing inner ring 52's set screw thread being M20, the two set screw angles being 120°, the distance between the mandrel's operating side step and the shaft end being 160mm, the axial position of the ball-head set screw 55 on the bearing inner ring 52, and the axial clearance 62 reserved based on the maximum thermal expansion elongation of the furnace top roller mandrel 6, the position and dimensions of the sliding grooves 61 can be determined. Setting the width of the sliding grooves 61 to 21mm, the length to 120mm, and the depth to 6mm, the sliding grooves 61 can be machined based on these data.

[0037] Step 2 (existing technology): Hoist the furnace top roller 2 into the furnace shell box 14, and align the mounting holes of the mandrel 6 on the furnace top roller 2 with the mounting holes of the mandrel on the furnace shell box 14.

[0038] Step 3 (existing technology): Insert the mandrel 6 from the transmission side into the furnace shell 14 until it reaches the operating side. During this process, insert the tensioning sleeve 12 between the mandrel 6 and the furnace top roller 2 without locking it.

[0039] Step 4 (existing technology): Insert the expansion joint 11 and the sealing bushing 10 into the mandrel 6 and fix them in place.

[0040] Step 5 (Invention): Install the transmission side bearing 4. Install the transmission side bearing 4 into place. During installation, adjust the direction of the two set screw holes of the bearing to face upwards to facilitate subsequent drilling.

[0041] Step 5.1 (Invention): Install the transmission side belt bearing 4. Install the transmission side belt bearing 4 into place. During installation, adjust the deflection angle of the two set screw holes of the bearing to match the predetermined position of the two countersunk holes 63 on the mandrel 6 to facilitate the installation of the pointed set screw 41.

[0042] Step 6 (existing technology): Install the drum gear coupling 9 into place.

[0043] Step 7 (Invention): Calculate the maximum elongation due to thermal expansion of the furnace top roller mandrel 6. A simplified formula for thermal expansion is used here to calculate the elongation data: △L=α×L0×△T Where: △L = elongation; α = the average linear expansion coefficient of the material in a certain temperature range (the specific value can be found in the table); L0 = the length of the mandrel 6; △T = the temperature change.

[0044] Given: From the table, we can find α = 11.15 × 10 -6 m / ℃, L0 = length of mandrel 10 = 2.775m, ΔT = temperature change (150℃ - 20℃) = 130℃; Substitute into the calculation: △L=11.15×10 -6m / ℃×2.775m×130℃≈0.004022m △L≈4.022mm Step 8 (Invention): Install the operating side bearing 5. During installation, the two set screw holes 54 on the bearing are aligned with the sliding groove 61, and the operating side bearing 5 is tightened in place.

[0045] Step Nine (Invention): Adjust the axial clearance 62 between the mandrel step end face I and the operating side bearing inner ring end face II. Using the end face II where the bearing inner ring contacts the mandrel step as a reference, move the mandrel 6 axially until the axial clearance 62 is slightly larger than the value of ΔL. Since ΔL≈4.022mm, the axial clearance 62 can be adjusted to 5mm.

[0046] Step 10: Install the two ball head set screws 55 of the operating side bearing 5. Install the two ball head set screws 55 from the two set screw holes 54 on the bearing. During this process, add high-strength thread fastener to the threads. After the ball head surface 56 gently touches the bottom surface of the sliding groove 61, apply a pre-tightening force of one finger. Only a very small pre-tightening force is needed here, and there is no need to apply a strong tightening force.

[0047] Step 11 (Invention): The mandrel 6 is axially fixed. At the positions of the two pointed set screws 41 corresponding to the bearing 4 on the transmission side, two countersunk holes 63 with a depth of 5mm are drilled on the mandrel 6 with a pistol drill along the direction of the set screws. Then, high-strength thread fastener is applied to the threads of the two pointed set screws 41 and tightened until the set screw tips 411 are sunk into the countersunk holes 63 and in close contact. Then, a lever is used to tighten them.

[0048] Step 11.1 (Invention): The mandrel 6 is axially fixed. High-strength thread fastener is applied to the threads of the two pointed set screws 41. The screws are tightened until the pointed ends 411 sink into the countersunk hole 63 and are in close contact. Then, the mandrel is tightened with a lever.

[0049] Step 12 (Prior Art): Adjust the position of the furnace top roller 2 to the middle of the furnace shell box 14, and tighten the tension sleeve 12.

[0050] Step 13 (existing technology): Measure and fine-tune the levelness of the surface of the furnace top roller 2.

[0051] Step Fourteen (Prior Art): Install motor 8 and measure and adjust the coaxiality of drum gear coupling 9.

[0052] Step 15 (Prior Art): Install the furnace door and operating side sealing cover 13 of the bright annealing furnace.

[0053] Step 16 (existing technology): Conduct furnace body airtightness testing and treatment.

[0054] The furnace top roller mounting structure of this embodiment is obtained by the above-described mounting method, including a core shaft 6 that penetrates the furnace body, an operating side bearing 5, and a transmission side bearing 4.

[0055] On the operating side of the mandrel 6, two axially extending sliding grooves 61 are provided, with a width, length and depth of 21mm, 120mm and 6mm respectively. Their positions are set according to the distribution of the set screw holes 54 of the inner ring 52 of the operating side bearing, the distance of the mandrel steps and the axial clearance 62 reserved for thermal expansion.

[0056] The operating side bearing 5 has two set screw holes 54, in which ball-head set screws 55 are installed. The ball head surface 56 of the ball-head set screw 55 contacts the bottom surface of the sliding groove 61 of the mandrel 6. This design allows the mandrel 6 to slide freely along the axial direction when it expands due to heat.

[0057] The transmission-side bearing 4 also has two set screw holes, which are fitted with pointed set screws 41. The tip of the pointed set screw 41 is embedded in the countersunk hole 63 drilled on the mandrel 6, thereby achieving a firm axial fixation of the mandrel 6 on the transmission side.

[0058] An axial clearance 62 is intentionally provided between the stepped end face I on the operating side of the mandrel and the inner ring end face II of the bearing on the operating side. The axial clearance 62 is slightly larger than the calculated maximum elongation of the mandrel due to thermal expansion, and is specifically designed to accommodate thermal deformation.

[0059] In summary, the installation structure of this embodiment achieves axial sliding through the cooperation of the sliding groove 61 and the ball head set screw 55, and achieves axial fixation through the pointed set screw 41 on the transmission side. With the addition of the reserved axial gap 62, it can effectively release thermal stress during the operation of the furnace top roller in hot state, and prevent the inner ring of the bearing from deviating and the spindle from moving and deviating, thereby improving the stability of installation and the reliability of operation.

[0060] Since its implementation in the applicant's No. 2 stainless steel bright plate annealing furnace unit in April 2022, equipment defects and safety hazards have been successfully eliminated. Until October 2025, the furnace top roller was in normal condition, and no abnormalities were found through daily tracking and equipment disassembly inspection.

[0061] In February 2024, this invention was applied to the applicant's No. 1 stainless steel bright plate annealing furnace unit, which also eliminated the equipment defects and safety hazards that had plagued the company for many years, with immediate results.

Claims

1. A method for installing the top roller of a stainless steel bright plate annealing furnace, characterized in that, At least the following steps are included: At least one sliding groove extending axially is machined on the operating side of the furnace top roller mandrel; Install a drive-side bearing with a mounting bracket; Install the operating side bearing with a mounting plate, and reserve an axial clearance between the inner ring of the operating side bearing with a mounting plate and the operating side step of the mandrel. The size of the axial clearance is determined based on the maximum thermal expansion elongation of the mandrel. A ball-head set screw is installed in the bearing on the operating side with a mounting seat, and the ball head is made to enter the sliding groove. A fixing structure is machined on the drive side of the mandrel; A pointed set screw is installed in the transmission-side bearing housing. The pointed set screw cooperates with the fixing structure to securely fix the transmission-side bearing housing to the spindle.

2. The installation method according to claim 1, characterized in that, The size of the axial clearance is determined based on the average linear expansion coefficient of the material used for the mandrel in the target temperature range, the length of the mandrel, and the amount of temperature change, and the value of the axial clearance is greater than the thermal expansion elongation of the mandrel due to temperature rise.

3. The installation method according to claim 1, characterized in that, When installing the ball head screw, only the minimum preload force is applied to make the ball head surface contact the bottom surface of the sliding groove.

4. The installation method according to claim 1, characterized in that, The fixing structure is a countersunk hole machined on the mandrel, and the tip of the pointed set screw is embedded in the countersunk hole.

5. The installation method according to claim 1, characterized in that, When installing the ball-head set screw and the pointed set screw, apply thread-locking agent to the threaded portion of the ball-head set screw and the pointed set screw.

6. The installation method according to claim 1, characterized in that, The position and size of the sliding groove are determined based on at least the following parameters: the thread specification of the ball head set screw, the distribution angle between set screws, the distance between the operating side step of the mandrel and the operating side shaft end of the mandrel, the axial position of the ball head set screw on the inner ring of the operating side bearing, and the axial clearance reserved between the inner ring of the operating side bearing and the operating side step of the mandrel.

7. The installation method according to claim 1, characterized in that, When the installation method is implemented for the first time, the steps of machining the sliding groove and machining the fixing structure are performed; during subsequent replacement and maintenance, the already machined sliding groove and fixing structure are directly used for assembly.

8. The installation method according to claim 1, characterized in that, The operating side bearing is a vertically mounted F-type bearing, and the transmission side bearing is a horizontally mounted P-type bearing.

9. A furnace top roller mounting structure for a stainless steel bright plate annealing furnace, comprising a mandrel penetrating the furnace body, an operating-side bearing with a mounting seat, and a transmission-side bearing with a mounting seat, characterized in that... The mandrel has at least one axially extending sliding groove on the operating side; The operating side bearing with seat is provided with a set screw hole, in which a ball-head set screw is installed. The ball head surface of the ball-head set screw contacts the bottom surface of the sliding groove, allowing the spindle to slide axially. The transmission side bearing is provided with a set screw hole, in which a pointed set screw is installed. The pointed end of the set screw is embedded in the corresponding fixing structure on the mandrel to achieve axial fixation.

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