High-precision silicon steel strip slitting line automatic cutter shaft temperature control system

Abstract

This invention provides a high-precision automatic cutter shaft temperature control system for a silicon steel coil slitting line, belonging to the field of sheet metal processing technology. It solves the technical problems of existing technologies, such as the inability to achieve closed-loop control. This high-precision automatic cutter shaft temperature control system for a silicon steel coil slitting line includes a cutter shaft. The end of the cutter shaft is connected to a cutter shaft frame via at least one bearing housing unit. The bearing housing unit is provided with an inlet and an outlet communicating with a bearing cavity. The inlet and outlet are connected to an oil circulation machine. At least one end of the bearing housing is equipped with a temperature detector for detecting the temperature of the cutter shaft shoulder. This invention has advantages such as strong cooling capacity, stable closed-loop temperature control effect, and good processing quality.

Description

Technical Field

[0001] This utility model belongs to the technical field of sheet metal processing equipment, and in particular relates to an automatic cutter shaft temperature control system for a high-precision silicon steel coil slitting line. Background Technology

[0002] A slitting line is a metal cutting device with a pair of vertically arranged cutter shafts, each with a disc-shaped shear blade mounted on it. During the shearing process, the temperature of the cutter shaft gradually rises due to high-speed friction between the shaft and bearings, heat conduction from the shearing process itself, and heat generated by the motor drive. The thermal expansion of the cutter shaft causes slight radial deformation, which is transmitted to the shear blades, altering the gap and overlap between them and causing them to deviate from the preset shearing parameters. Ultimately, this leads to decreased shearing accuracy, reduced shear surface quality, and even abnormal wear or chipping of the shear blades, severely impacting product quality and production stability. To address these issues, researchers have conducted extensive research and proposed various solutions.

[0003] For example, Chinese patent literature discloses an adjustable automatic constant temperature hot water bag [application number: CN201280036586.6], comprising an inner ring that engages with the end of a ball screw shaft 110 and rotates integrally with the screw shaft; an outer ring that supports the inner ring to rotate through a plurality of rolling elements disposed on the outer circumferential surface of the inner ring; and a housing having an inner circumferential surface that abuts against the outer circumferential surface of the outer ring and supports the screw shaft to rotate. Multiple cooling through holes are formed along the axial direction of the housing, extending through both ends of the housing to allow the cooling medium to pass through. This invention has the advantage of efficiently cooling bearing devices.

[0004] While the above-mentioned solution provides good cooling for bearings, it only applies to single bearings and cannot meet the precision requirements of machining silicon steel. Silicon steel is thin, hard, and brittle. Therefore, the precision requirements for both the equipment and the finished product are relatively higher. There are also specific requirements for the temperature difference between the upper and lower cutter shafts. For ordinary materials, a temperature rise of 15°C-20°C and a temperature difference of less than 8°C between the upper and lower cutter shafts are acceptable. However, for silicon steel, a temperature rise of ≤3°C and a temperature difference of less than 1°C, or even no temperature difference at all, are required to meet the precision requirements. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a high-precision automatic cutter shaft temperature control system for silicon steel coil slitting lines that can achieve high-precision closed-loop control of cutter shaft temperature.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system includes a cutter shaft. The end of the cutter shaft is connected to the cutter shaft frame through at least one bearing seat unit. The bearing seat unit is provided with an inlet and an outlet that communicate with the bearing cavity. The inlet and outlet are connected to an oil circulation machine. At least one end of the bearing seat is provided with a temperature detector for detecting the temperature of the cutter shaft shoulder.

[0007] By directly connecting the bearing cavity to the inlet and outlet of the oil circulation machine, efficient direct temperature control of the heat source can be achieved. The stable low temperature effectively extends the service life of the bearing and the cutter shaft, reducing wear and malfunctions caused by overheating. Simultaneously, a temperature detector installed on the cutter shaft shoulder can monitor and provide real-time feedback on the cutter shaft temperature. Alarm thresholds can also be set, prompting an alarm or shutdown when the temperature rises abnormally, preventing serious damage to the equipment due to overheating. This achieves closed-loop control for real-time adjustment of the cutter shaft temperature.

[0008] In the aforementioned high-precision silicon steel coil slitting line automatic cutter shaft temperature control system, the bearing housing unit includes a bearing housing. The bearing housing housing is provided with an inlet and an outlet, with the inlet located away from the outlet. Cooling oil enters from one end and flows out from the far end of the other, forcing the oil to fill the entire bearing cavity and ensuring sufficient and uniform heat exchange with the heat-generating components. This avoids localized overheating and ensures the consistency and controllability of the temperature throughout the bearing and shoulder area.

[0009] In the aforementioned high-precision silicon steel coil slitting line automatic cutter shaft temperature control system, the bearing housing is provided with a first maintenance channel and a second maintenance channel that radially penetrate the bearing housing and communicate with the bearing cavity. The first maintenance channel is located away from the second maintenance channel. The liquid inlet is connected to both ends of the first maintenance channel, and the liquid outlet is connected to both ends of the second maintenance channel. This design of the maintenance channels provides a direct access point for maintenance operations, enabling maintenance without disassembly and improving equipment availability and maintenance convenience.

[0010] In the aforementioned high-precision silicon steel coil slitting line automatic cutter shaft temperature control system, the first and second maintenance channels are symmetrically arranged. This symmetrical channel design ensures a more uniform and balanced distribution of internal stress in the bearing housing under heat and pressure. It reduces the tendency for twisting or deformation that might occur due to an asymmetrical structure, enhances the overall rigidity and stability of the bearing housing, provides a reliable support foundation for the cutter shaft, and further guarantees shearing accuracy.

[0011] In the aforementioned high-precision silicon steel coil slitting line automatic cutter shaft temperature control system, there are two cutter shafts, one above the other. The oil supply port of the oil circulation machine is connected to each inlet via an oil supply distributor, and the oil return port of the oil circulation machine is connected to each outlet via an oil return distributor. The oil supply and return distributors ensure that the cooling oil from the circulation machine is stably distributed to each inlet of the upper and lower cutter shafts and simultaneously collects the returned oil. This ensures the uniformity and synchronization of cooling across the multiple cutter shafts, guaranteeing high-precision shearing quality. Furthermore, it meets the precision requirements of silicon steel materials for the temperature difference between the upper and lower cutter shafts.

[0012] In the aforementioned high-precision silicon steel coil slitting line automatic cutter shaft temperature control system, one end of the cutter shaft is connected to the cutter shaft holder via two bearing housing units. The oil supply distributor and oil return distributor are located on the side of the cutter shaft holder between the two bearing housings. The length and direction of the pipelines from the oil supply distributor and oil return distributor to the two bearing housings are symmetrical, which further ensures that the cooling oil flow and pressure distributed to the left and right bearing housings are more uniform and consistent, avoiding cooling differences caused by pipeline asymmetry.

[0013] In the aforementioned high-precision silicon steel coil slitting line automatic cutter shaft temperature control system, both the return oil distributor and the supply oil distributor are quantitative distributors. During operation, the oil circulation machine may experience slight pressure fluctuations; changes in oil temperature can lead to changes in oil viscosity, thus affecting flowability; and slight differences in pipeline resistance may also exist. The quantitative distributor can effectively resist these fluctuations in upstream parameters, consistently providing a stable flow rate downstream, thus enhancing system stability.

[0014] In the above-mentioned high-precision silicon steel coil slitting line automatic cutter shaft temperature control system, a refrigeration unit is connected between the oil supply port of the oil circulation machine and the oil supply distributor.

[0015] Alternatively, a chiller can be connected between the oil return port and the oil return distributor of the oil circulation machine. By introducing a chiller into the oil circulation loop, the temperature control system has an active cooling capability, thereby coping with various complex working conditions, stabilizing the cutter shaft temperature at the set value, and ensuring machining accuracy.

[0016] In the above-mentioned high-precision silicon steel coil slitting line automatic cutter shaft temperature control system, the chiller is fixed to the side of the cutter shaft holder on one side of the cutter shaft through a detachable structure.

[0017] The oil circulation machine is fixed to the bottom of the cutter shaft holder via a detachable structure. All core components of the temperature control system are integrated with the main unit, reducing the overall footprint of the equipment and making the production line layout more compact.

[0018] In the aforementioned high-precision silicon steel coil slitting line automatic cutter shaft temperature control system, the temperature detector is connected to the cutter shaft holder via a detachable structure, and the probe of the temperature detector, facing the cutter shaft shoulder at the bearing housing end, can detect the circumferential temperature of the cutter shaft shoulder. The cutter shaft shoulder is the area where the bearing and the cutter shaft directly mate; detecting the temperature here can sensitively reflect the actual operating temperature of the cutter shaft, providing timely and accurate data feedback for the control system.

[0019] The importance of cutter shaft temperature control lies in ensuring slitting quality. Overheating of the cutter shaft leads to thermal expansion. Increased cutter shaft diameter directly alters the clearance and overlap of the disc cutters. Temperature fluctuations cause changes in these parameters, resulting in increased burrs, deterioration of cross-sectional quality (tearing, corner collapse), and even differences in strip width dimensions during slitting. To avoid affecting the strip shape, uneven temperature rise may cause slight bending of the cutter shaft, affecting the straightness of the shearing or the strip shape after slitting.

[0020] It also protects bearings and shaft systems, preventing bearing failure. Excessive temperature accelerates the oxidation and deterioration of bearing grease / oil, reducing its lubrication performance and leading to dry friction, increased wear, and even seizure. High temperatures can also anneal bearing rings and rolling element materials, reducing load-bearing capacity. Furthermore, overheating and expansion of the tool shaft itself or the bearing inner ring may cause excessive tightness in the fit with the bearing housing or shaft, resulting in abnormal friction or even seizure, causing major equipment failure. Additionally, high temperatures accelerate the aging, hardening, and failure of seals, leading to lubricant leakage or the entry of external contaminants.

[0021] It also improves equipment stability and reduces downtime, enabling preventative maintenance. Stable temperatures reduce unexpected downtime caused by excessive tool wear, bearing damage, or shaft system failure. Furthermore, it avoids problems such as mechanical interference and increased vibration caused by thermal expansion, ensuring stable operation of the equipment over long periods.

[0022] It also improves production efficiency and reduces costs. Extended tool life means fewer tool changes and increased effective production time. Furthermore, consistent shearing quality reduces scrap rates and rework costs caused by burrs, dimensional errors, etc. Additionally, it protects expensive bearings, tool shafts, and inserts, reducing spare parts consumption and maintenance costs.

[0023] It also improves safety. Overheated cutter shafts and bearing housings can reach extremely high surface temperatures, posing a risk of burns to operators. Furthermore, in certain environments (such as those with oil mist or dust), excessively high temperatures could become an ignition source. A cutter shaft temperature control system can avoid these safety risks.

[0024] Compared with existing technologies, the advantages of this high-precision silicon steel coil slitting line's automatic cutter shaft temperature control system are: 1. Internal circulation cooling loop, providing strong cooling capacity. 2. Temperature monitoring design, closed-loop control, and stable temperature control effect. 3. Dual-cutter shaft balanced temperature control, resulting in better processing quality. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram provided by this utility model.

[0026] Figure 2 This utility model provides Figure 1 Enlarged structural diagram at point A in the middle.

[0027] Figure 3 This is a side view of the structure provided by this utility model.

[0028] Figure 4 This is a schematic diagram of the circuit connection structure provided by this utility model.

[0029] In the figure, there are: cutter shaft 1, cutter shaft shoulder 11, bearing housing unit 2, bearing cavity 21, first maintenance channel 221, second maintenance channel 222, bearing housing 23, oil circulation machine 3, liquid inlet 31, liquid outlet 32, oil supply port 33, oil supply distributor 331, oil return port 34, oil return distributor 341, refrigeration unit 35, circulation pump 36, cutter shaft holder 4, temperature detector 5, and controller 51. Detailed Implementation

[0030] like Figures 1 to 4 As shown, the high-precision silicon steel coil slitting line automatic cutter shaft temperature control system includes a cutter shaft 1. The end of the cutter shaft 1 is connected to the cutter shaft frame 4 through a bearing seat unit 2. The bearing seat unit 2 is provided with an inlet 31 and an outlet 32 ​​that communicate with the bearing cavity 21. The inlet 31 and the outlet 32 ​​are connected to the oil circulation machine 3. The bearing seat unit 2 is provided with a device for detecting the temperature of the cutter shaft shoulder 11.

[0031] In this embodiment, the temperature control of the cutter shaft 1 is achieved through a closed-loop feedback system including a temperature detector 5. This system utilizes the internal cooling circulation within the bearing cavity 21, with the oil circulator 3 controlling the circulating oil from the inlet 31 to the outlet 32 ​​within the circulation loop, actively stabilizing the temperature of the cutter shaft 1 within a reasonable target range. Its core necessity lies in ensuring shearing quality, maximizing tool life, protecting the core bearings and shaft system, ensuring stable and efficient equipment operation, reducing overall production costs, and improving safety.

[0032] More specifically, the bearing housing unit 2 includes a bearing housing 23, and the housing of the bearing housing 23 is provided with an inlet 31 and an outlet 32, with the inlet 31 being far away from the outlet 32.

[0033] like Figure 2As shown, the bearing housing 23 has a first maintenance channel 221 and a second maintenance channel 222 that radially penetrate the bearing housing 23 and communicate with the bearing cavity 21. The first maintenance channel 221 is located away from the second maintenance channel 222. The liquid inlet 31 is connected to both ends of the first maintenance channel 221, and the liquid outlet 32 ​​is connected to both ends of the second maintenance channel 222. The first maintenance channel 221 and the second maintenance channel 222 are symmetrically arranged.

[0034] More specifically, there are two cutter shafts 1, which are distributed vertically. The oil supply port 33 of the oil circulation machine 3 is connected to each inlet port 31 through the oil supply distributor 331, and the oil return port 34 of the oil circulation machine 3 is connected to each outlet port 32 through the oil return distributor 341.

[0035] More specifically, one end of the cutter shaft 1 is connected to the cutter shaft holder 4 via two bearing housing units 2, and the oil supply distributor 331 and the oil return distributor 341 are located on the side of the cutter shaft holder 4 between the two bearing housing units 2. Both the oil return distributor 341 and the oil supply distributor 331 are quantitative distributors.

[0036] like Figure 1 and 3 As shown, a refrigeration unit 35 is connected between the oil supply port 33 of the oil circulation machine 3 and the oil supply distributor 331.

[0037] More specifically, the refrigeration unit 35 is fixed to the side of the cutter shaft holder 4 on one side of the cutter shaft 1 by a detachable structure;

[0038] The oil circulation machine 3 is fixed to the bottom of the cutter shaft holder 4 by a detachable structure.

[0039] More specifically, the temperature detector 5 is connected to the tool shaft holder 4 via a detachable structure, and the probe of the temperature detector 5 can detect the circumferential temperature of the tool shaft shoulder 11 facing the bearing seat 23.

[0040] In this embodiment, the circumferential temperature data of the cutter shaft shoulder 11 detected by the temperature detector 5 is transmitted to the controller 51. The controller 51 controls the start and stop of the cooling machine 35 and the circulation pump 36 of the oil circulation machine 3 according to the temperature data to achieve closed-loop control of the temperature of the cutter shaft 1.

[0041] The working principle of this embodiment is that the main source of the temperature rise of the cutter shaft 1 is frictional heat. The main reason for frictional heat is that the bearing housing 23 supporting the high-speed rotation of the cutter shaft 1 generates a large amount of frictional heat when operating under load. The heat generated by friction is conducted to the cutter shaft 1, thereby causing the temperature of the cutter shaft 1 to rise.

[0042] The heat generated by the bearing housing 23 is removed by circulating cooling within the bearing cavity, thereby reducing the temperature of the cutter shaft 1 and maintaining it within the set target range. This method directly acts near the heat source, resulting in high cooling efficiency and high temperature control precision.

[0043] Temperature detector 5 compares the measured temperature of the cutter shaft shoulder 11 with the set value. Based on the magnitude and direction of the deviation (measured value - set value), controller 51 outputs a signal to the actuator composed of a circulating pump 36 and a chiller 35, etc., to change the temperature and flow rate of the cooling medium, so that the cutter shaft temperature tends to and stabilizes at the set value.

[0044] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0045] Although this document frequently uses terms such as cutter shaft, cutter shaft shoulder, bearing housing unit, bearing cavity, bearing housing shell, first maintenance channel, second maintenance channel, bearing housing, oil circulation machine, inlet, outlet, oil supply port, oil supply distributor, return oil port, return oil distributor, refrigeration unit, circulating pump, cutter shaft holder, temperature detector, and controller, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A high-precision automatic cutter shaft temperature control system for a silicon steel coil slitting line, characterized in that, Includes a cutter shaft (1), the end of which is connected to the cutter shaft holder (4) via at least one bearing seat unit (2). The bearing seat unit (2) is provided with an inlet (31) and an outlet (32) communicating with the bearing cavity (21). The inlet (31) and the outlet (32) are connected to the oil circulation machine (3). At least one end of the bearing seat unit (2) is provided with a temperature detector (5) for detecting the temperature of the cutter shaft shoulder (11).

2. The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system according to claim 1, characterized in that, The bearing housing unit (2) includes a bearing housing (23), and the bearing housing (23) is provided with a liquid inlet (31) and a liquid outlet (32), and the liquid inlet (31) is far away from the liquid outlet (32).

3. The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system according to claim 2, characterized in that, The bearing housing (23) is provided with a first maintenance channel (221) and a second maintenance channel (222) that are radially connected to the bearing cavity (21). The first maintenance channel (221) is far away from the second maintenance channel (222). The liquid inlet (31) is connected to both ends of the first maintenance channel (221), and the liquid outlet (32) is connected to both ends of the second maintenance channel (222).

4. The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system according to claim 3, characterized in that, The first maintenance channel (221) and the second maintenance channel (222) are symmetrically arranged.

5. The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system according to claim 1, 2, 3, or 4, is characterized in that, The cutter shaft (1) has two shafts and is distributed vertically. The oil supply port (33) of the oil circulation machine (3) is connected to each inlet port (31) through an oil supply distributor (331). The oil return port (34) of the oil circulation machine (3) is connected to each outlet port (32) through an oil return distributor (341).

6. The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system according to claim 5, characterized in that, One end of the cutter shaft (1) is connected to the cutter shaft holder (4) through two bearing seat units (2), and the oil supply distributor (331) and the oil return distributor (341) are located on the side of the cutter shaft holder (4) between the two bearing seats (2).

7. The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system according to claim 5, characterized in that, Both the return oil distributor (341) and the supply oil distributor (331) are quantitative distributors.

8. The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system according to claim 1, 2, 3, or 4, is characterized in that, A refrigeration unit (35) is connected between the oil supply port (33) and the oil supply distributor (331) of the oil circulation machine (3). Alternatively, a refrigeration unit (35) is connected between the oil return port (34) of the oil circulation machine (3) and the oil return distributor (341).

9. The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system according to claim 8, characterized in that, The refrigeration unit (35) is fixed to the side of the cutter shaft holder (4) on one side of the cutter shaft (1) by a detachable structure; The oil circulation machine (3) is fixed to the bottom of the cutter shaft holder (4) by a detachable structure.

10. The high-precision silicon steel coil slitting line automatic cutter shaft temperature control system according to claim 1, 2, 3, or 4, characterized in that, The temperature detector (5) is connected to the cutter shaft holder (4) via a detachable structure, and the probe of the temperature detector (5) facing the cutter shaft shoulder (11) at the bearing seat (23) end can detect the circumferential temperature of the cutter shaft shoulder (11).

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