Intelligent segmented temperature control energy-saving corrugator

Abstract

The application discloses an intelligent segmented temperature control energy-saving corrugating machine, and belongs to the field of intelligent manufacturing equipment. The device comprises a corrugating roller, a segmented electromagnetic heating device and a segmented temperature measuring assembly. The corrugating roller is of a hollow structure, the segmented electromagnetic heating device is arranged in the corrugating roller, and the segmented temperature measuring assembly is arranged outside the corrugating roller. The device forms a closed-loop temperature control system relying on a PLC, the segmented temperature measuring assembly collects roller surface temperatures in different zones, the segmented electromagnetic heating device supplies heat in different zones, the PLC adjusts the power of each zone in real time according to the temperature measuring data, precisely compensates heat loss of each part of the roller body, and improves the uniformity of the roller surface temperature. The central shaft of the segmented electromagnetic heating device is hollow, and the cable is arranged inside, so that the electrical operation stability is improved. The electromagnetic disc directly generates heat on the roller wall through induction, the heat loss is small, the power is adjusted by starting and stopping in different zones, the whole machine does not need to work under full load, the heating and temperature rising are fast, the heat efficiency is high, the production quality is ensured, the energy consumption is reduced, and the equipment is operated in an energy-saving and efficient manner.

Description

Technical Field

[0001] This invention relates to the field of intelligent manufacturing equipment, specifically to an energy-saving corrugated machine with intelligent segmented temperature control. Background Technology

[0002] Currently, most corrugated cardboard production lines use steam heating or thermal oil heating for their corrugated rolls. The high-temperature heat transfer medium needs to be transported into the roll cavity through lengthy pipelines, resulting in significant heat loss due to pipeline heat dissipation, joint leaks, and other heat exchange problems. This leads to a large amount of unnecessary heat loss, high overall equipment energy consumption, and low thermal efficiency. Furthermore, the preheating process between the medium pipelines and the roll cavity is time-consuming, requiring a long preheating period after startup to reach the required operating temperature, resulting in a long start-up wait time and reducing the effective production time of the production line.

[0003] To overcome the drawbacks of traditional heating methods, such as high energy consumption and slow temperature rise, patent CN105034454B discloses an electromagnetically heated corrugated roll with an induction coil built into the roll body. This method replaces steam and heat transfer oil heat exchange structures with electromagnetic induction heating, achieving some progress in energy consumption control. However, this solution still has two substantial defects: First, the electromagnetic controller relies on a rotating block and a sliding groove to form an external slip ring structure to connect to the power supply. During the high-speed continuous operation of the corrugated roll, the conductive components experience continuous friction and wear, which can easily lead to faults such as arcing, poor contact, and power failure, resulting in high equipment maintenance frequency. Second, the internal induction coil is wound as a whole, which can only provide synchronous power to the entire roll for full-area heating, and cannot independently control the temperature of sections and zones along the axial direction of the roll body. The heat dissipation rate at both ends of the corrugated roll is much greater than that in the middle of the roll body. The heat loss is uneven in all places. In order to make up for the temperature gap in the areas with fast heat dissipation, the entire roll can only be heated at full power. This causes the temperature in areas with less heat dissipation to exceed the standard and local overheating. The temperature difference on the roll surface is huge. This not only easily causes local blistering of the cardboard, corrugation skewing, and inconsistent forming quality, but also generates unnecessary excess energy consumption, thus limiting the energy-saving effect. Summary of the Invention

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An energy-saving corrugating machine with intelligent segmented temperature control includes a corrugated roller. The corrugated roller has a cylindrical hollow structure and an outer wall made of magnetically conductive metal. Segmented electromagnetic heating devices are arranged sequentially along the axial direction of the corrugated roller inside the roller body. Segmented temperature measuring components are arranged along the axial direction of the corrugated roller outside the roller body. The segmented electromagnetic heating devices and segmented temperature measuring components work together and are connected to an external PLC (Programmable Logic Controller System). The heating power of different sections of the roller body can be independently and intelligently controlled based on the temperature feedback data.

[0005] The segmented electromagnetic heating device includes a central shaft and electromagnets. The hollow central shaft is coaxially arranged within the inner cavity of the roller body, allowing for wiring. Multiple electromagnets are arranged sequentially along the central shaft axis and fixed to its outer side, with their surfaces close to the inner wall of the roller body. Each electromagnet is electrically connected to a PLC (Programmable Logic Controller) system, enabling independent start / stop and power adjustment for each segment. A cylindrical heat insulation layer is installed between the inner wall of the roller body and the electromagnets, fitting snugly against the inner wall. This insulation layer not only prevents heat loss into the roller body, improving heat utilization, but also isolates the roller body from reverse high-temperature radiation, providing thermal protection for the electromagnets and preventing them from overheating and aging.

[0006] This invention discloses an energy-saving corrugated machine with intelligent segmented temperature control, equipped with a corrugated roller shaft, roller bearings, a frame, and an adjusting clamp. The corrugated roller shaft is divided into two sections and fitted onto the outer sides of both ends of a central shaft. The corrugated roller shaft and the central shaft can rotate relative to each other. The corrugated roller shaft is connected to both ends of the roller body through a three-pronged star-shaped connecting structure. The gap in the three-pronged star-shaped connecting structure forms a ventilation channel, which is conducive to heat dissipation and ventilation inside the roller body. Roller bearings are installed on the outer side of the corrugated roller shaft, and the bearing seats of the roller bearings are fastened to the frame. One end of the central shaft extends outward at the outer end of the corrugated roller shaft and the roller bearings, and a radially penetrating adjusting groove is opened. The adjusting clamp is equipped with an insert rod, which is inserted into the adjusting groove. The adjusting clamp holds the bearing seat corresponding to the roller bearing. The rotation angle of the central shaft can be limited by locking and unlocking the adjusting clamp. The adjusting clamp is also equipped with a pair of arc-shaped clamps and two operating handles. The two ends of the insertion rod are respectively hinged to the corresponding operating handles. The two sets of arc-shaped clamps are arranged around the bearing seat. The ends of the arc-shaped clamps and the operating handles on the same side are hinged and linked. By moving the operating handles, the arc-shaped clamps on both sides can be controlled to close and tighten the bearing seat or open and loosen the bearing seat, thus completing the locking and unlocking of the central shaft angle.

[0007] The segmented temperature measurement assembly includes a strip-shaped probe base and multiple sets of infrared detection probes. The probe base is strip-shaped and fixed on the frame, located near the outer side of the roller and extending along the axial direction of the corrugated roller. Multiple sets of infrared detection probes are evenly installed side by side on the probe base, with the infrared detection probes facing the outer wall of the roller. The infrared detection probes are electrically connected to a PLC (Programmable Logic Controller System) to collect the real-time temperature of each section of the outer wall of the roller in segments.

[0008] The corrugated rollers are provided in pairs, namely an upper corrugated roller and a lower corrugated roller, whose outer walls mesh with each other. A pair of openable roller bearing holders are mounted on the upper part of the frame, covering and limiting the roller bearings at both ends of the upper corrugated roller. A pair of through-slot adjustment grooves are provided on the lower part of the frame. The roller bearings at both ends of the lower corrugated roller are slidably fitted inside the lower corrugated roller adjustment grooves. The lower corrugated roller adjustment grooves are arranged with a downward oblique depth, and the center distance between the lower corrugated roller adjustment groove and the upper corrugated roller gradually decreases along the downward oblique depth direction, thereby enabling continuous fine adjustment of the gap between the two rollers when the lower corrugated roller slides. A limiting protrusion is provided on the inner side of the lower corrugated roller adjustment groove to prevent the roller bearings from moving inward along the roller body axis. Adjusting rods are mounted on the left and right sides of the frame, with one end of the adjusting rod sleeved onto the lower corrugated roller bearing seat and the other end hinged to the side wall of the frame. By limiting the sliding position of the roller bearings within the lower corrugated roller adjustment groove, the roller gap between the upper and lower corrugated rollers is adjusted.

[0009] The beneficial effects of this invention are as follows: 1. The corrugated roll adopts a segmented electromagnetic heating device for zoned temperature control, and in conjunction with a segmented temperature measuring component to collect the roll surface temperature in each zone, the PLC closed-loop control of the heating power of each zone can compensate for heat loss at different positions of the roll body as needed, greatly improving the temperature uniformity of the entire roll surface, improving the forming quality of corrugated cardboard in all areas, and reducing defects such as local bubbling and corrugated shape deviation.

[0010] 2. The cable is laid out along the inside of the hollow central shaft, abandoning the existing conductive structure that relies on external power supply through rotating blocks and sliding grooves. This eliminates the need for external rotating conductive connectors, thus eliminating the risk of arcing due to rotational friction and power failure due to wear of parts. The connection at the shaft end is more stable, and the failure rate of the equipment's electrical operation is significantly reduced.

[0011] 3. The electromagnet relies on the magnetic outer wall of the corrugated roller to achieve electromagnetic induction heating. The heat is generated directly on the roller wall. Compared with the indirect heating of traditional heat transfer oil and electric heating tube, the heat loss is low. The segmented independent power adjustment can avoid continuous full power heating throughout the entire area, effectively reducing the energy consumption of the whole machine and achieving energy-saving operation.

[0012] 4. The inner wall of the corrugated roll is equipped with a heat insulation layer to prevent the heat from the electric disk from dissipating inward. Most of the heat is transferred to the working surface of the outer wall of the roll, further reducing useless heat consumption and improving heat energy utilization. At the same time, it reduces the rate of aging of components such as the central shaft and bearings inside the roll and extends the service life of the parts.

[0013] 5. An adjustment clamp with an arc-shaped clamp and an operating handle is set up. The rotation angle of the central shaft is locked by the insertion rod and the adjustment groove of the central shaft. During the continuous rotation of the corrugated roll, the relative position of the electric disk is adjusted by the rotation angle. It can give priority to the centralized heating of the designated roll sector. The other areas of the roll body are heated simultaneously but the heating power ratio is lower. It focuses on local heat source output as needed to adapt to different heating needs.

[0014] 6. The external infrared segmented temperature measurement structure is adopted, so the temperature probe does not contact the high-speed rotating corrugated roller, eliminating probe wear and roller jamming failures. The temperature measurement data is stable and reliable, avoiding downtime maintenance caused by the wear and tear of contact temperature measurement elements and increasing the continuous production time of the equipment.

[0015] 7. The frame is equipped with an opening and closing corrugated seat, a downward-sloping corrugated adjustment groove and adjustment rod structure, which can easily adjust the gap between the upper and lower corrugated rollers. With the segmented temperature control structure, the roller gap and zone temperature can be finely adjusted simultaneously when changing to different weight base paper, which shortens the time for equipment changeover and debugging and makes the production adaptability stronger.

[0016] 8. Limiting protrusions are installed in the lower corrugated adjustment groove to restrict the axial movement of the roller bearing, ensure the coaxiality of the upper and lower corrugated rollers and the consistency of the roller gap, avoid local extrusion abnormalities caused by roller body misalignment, and further stabilize the corrugated forming accuracy and reduce the equipment failure rate by uniform segmented temperature control. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of an energy-saving corrugated machine with intelligent segmented temperature control according to the present invention.

[0018] Figure 2 for Figure 1 Enlarged view of point A in the image.

[0019] Figure 3 for Figure 1 Enlarged view of point B in the image.

[0020] Figure 4 This is a right view of an energy-saving corrugated machine with intelligent segmented temperature control according to the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of the upper corrugated roller.

[0022] Figure 6 This is a three-dimensional structural diagram of the lower corrugated roller.

[0023] Figure 7 This is a schematic diagram of the three-dimensional structure inside the corrugated roller.

[0024] Figure 8 This is a three-dimensional structural diagram of the T-shaped connecting plate and the components connected to it.

[0025] Figure 9 This is a three-dimensional structural diagram of the T-shaped connecting plate and the components connected to it from another angle.

[0026] Figure 10 This is a three-dimensional structural diagram of the adjusting clip.

[0027] In the diagram, 1. Corrugated roll; 11. Roller body; 12. Insulation layer; 13. Corrugated roll shaft; 14. Three-pronged star connector; 15. Drive gear; 2. Segmented electromagnetic heating device; 21. Central shaft; 22. Electromagnetic disk; 23. Adjustment groove; 24. T-shaped connecting plate; 25. Wiring hole; 26. Wiring cavity; 3. Segmented temperature measuring assembly; 31. Probe base; 32. Infrared detection probe; 33. Feed roller; 4. Adjustment clamp; 41. Arc-shaped clamp; 42. Insert rod; 43. Operating handle; 5. Frame; 51. Corrugated roll holder; 52. Lower corrugated adjustment groove; 53. Adjustment rod; 54. Limiting protrusion; 6. Roller bearing. Detailed Implementation

[0028] An energy-saving corrugated machine with intelligent segmented temperature control includes a corrugated roller 1, a segmented electromagnetic heating device 2, a segmented temperature measuring component 3, an adjusting clamp 4, a frame 5, and roller bearings 6.

[0029] Two corrugated rollers 1 are provided, namely an upper corrugated roller and a lower corrugated roller. The outer walls of the upper and lower corrugated rollers are meshed with each other and installed on the frame 5. A drive gear 15 is fixedly installed on the outer side of the corrugated roller shaft 13 corresponding to the upper corrugated roller. The drive gear 15 is connected to an external drive power component to realize the rotation drive of the entire roller body.

[0030] The corrugated roller 1 includes a roller body 11, a heat insulation layer 12, a corrugated roller shaft 13, and a three-pronged star-shaped connector 14.

[0031] The roller body 11 is a hollow cylinder. The outer wall of the roller body 11 is made of magnetically conductive steel. The inner wall of the roller body 11 is fixed with a cylindrical heat insulation layer 12, which is made of high-temperature resistant alumina ceramic material.

[0032] The segmented electromagnetic heating device 2 is assembled inside the roller body 11. The segmented electromagnetic heating device 2 includes a central shaft 21 and twelve sets of electromagnetic disks 22. The central shaft 21 is hollow and coaxially inserted inside the roller body 11. The hollow central shaft 21 forms a through wiring channel, and all the lead wires of the electromagnetic disks can be stored and laid inside the wiring channel, which neatly arranges the wiring and avoids damage to the wiring due to friction caused by the rotation of the roller body. The twelve sets of electromagnetic disks 22 are arranged along the axial direction of the central shaft 21 and are fixed to the outer wall of the central shaft 21 at equal intervals by T-shaped connecting plates 24. The whole machine has a total of six T-shaped connecting plates 24. Two electromagnetic disks 22 are fixed on each T-shaped connecting plate 24. Wiring holes 25 are opened on the central shaft 21 corresponding to the positions of each T-shaped connecting plate 24. Wiring cavities 26 are opened on the inner side of the T-shaped connecting plates 24. The wiring of the electromagnetic disks 22 passes through the wiring cavity 26 and the wiring hole 25 in sequence and then enters the wiring channel inside the central shaft 21, realizing the segmented wiring layout. The electromagnets 22 are arranged close to the inner surface of the heat insulation layer 12 on the outside. Each group of electromagnets 22 is independently wired and electrically connected to the PLC (Programmable Logic Controller). Each electromagnet 22 can individually adjust its output power.

[0033] The corrugated roller shaft 13 is fixed in two sections at both ends of the roller body 11. The corrugated roller shaft 13 and the roller body 11 are connected by a three-pronged star-shaped connector 14. The gap of the three-pronged star-shaped connector 14 forms a ventilation channel that runs through the inside of the roller body, allowing external air to enter the inner cavity of the roller body and achieve internal air circulation and heat dissipation. The corrugated roller shaft 13 is sleeved on the outside of both ends of the central shaft 21 and rotates with the central shaft 21. Roller bearings 6 are fitted on the outside of the corrugated roller shaft 13, and the outside of the roller bearings 6 is a bearing seat. One end of the central shaft 21 passes outward through the corrugated roller shaft 13 and extends outward from the end of the roller bearing 6. A radially through adjusting groove 23 is opened in the extended section.

[0034] The adjusting clamp 4 consists of an arc-shaped clamp 41, a rod 42, and an operating handle 43. The rod 42 is inserted laterally into the adjusting groove 23. The arc-shaped clamps 41 on both sides enclose the bearing seat of the roller bearing 6. The operating handle 43 is hinged to both ends of the rod 42. The operating handle 43 and the end of the arc-shaped clamp 41 on the same side are hinged. Moving the operating handle 43 will cause the arc-shaped clamps 41 on both sides to close and tighten the bearing seat, locking the circumferential position of the central shaft 21. Moving the operating handle 43 in the opposite direction will loosen the arc-shaped clamps 41 and release the locking limit.

[0035] The segmented temperature measurement component 3 is fixed on the frame 5. The segmented temperature measurement component 3 includes a strip-shaped probe base 31 and twelve infrared detection probes 32. The probe base 31 is arranged along the axial direction of the corrugated roll 1 on the paper feeding side next to the roll body 11. The twelve infrared detection probes 32 are evenly distributed on the probe base 31, and the probe ends of the infrared detection probes 32 face the outer surface of the roll body 11. All the infrared detection probes 32 are connected to the PLC (Programmable Logic Controller) to collect the segmented temperature data of the roll body in real time. The upper and lower probe bases 31 are arranged parallel to each other. A paper feeding roller 33 is installed between the two probe bases 31. The paper feeding roller 33 supports the conveyed paperboard and prevents the paperboard from falling and touching the infrared detection probes 32.

[0036] A pair of corrugated roller bearings 51 are fixed at the upper end of the frame 5. The bearing bearings 51 cover and limit the roller bearings 6 at both ends of the upper corrugated roller. A pair of obliquely arranged lower corrugated roller adjusting grooves 52 are opened at the lower part of the frame 5. The roller bearings 6 at both ends of the lower corrugated roller are slidably placed inside the groove of the lower corrugated roller adjusting groove 52. The change in the depth of the groove cavity of the lower corrugated roller adjusting groove 52 causes the center distance between the lower corrugated roller and the upper corrugated roller to change gradually when the lower corrugated roller slides. Adjusting rods 53 are respectively installed on the left and right sides of the frame 5. One end of the adjusting rod 53 is sleeved on the bearing seat of the lower corrugated roller bearing 6, and the other end is hinged to the side wall of the frame 5. The adjusting rod 53 limits the sliding stroke of the roller bearing 6 in the lower corrugated adjusting groove 52. On the inner wall of the lower corrugated adjusting groove 52, near the inner side, there are integrally formed limiting protrusions 54 that are aligned with the direction of the lower corrugated adjusting groove 52. The limiting protrusions 54 prevent the roller bearing 6 from moving inward along the axis of the corrugated roller and guide the sliding of the roller bearing 6 in the lower corrugated adjusting groove 52.

[0037] When the equipment is running, the driving power drives the upper corrugated roller to rotate synchronously via the drive gear 15 and engages with the lower corrugated roller to rotate. The infrared detection probe 32 continuously collects the real-time temperature of the roller body 11 surface in sections. The temperature measurement data is transmitted to the PLC (Programmable Logic Controller) in a closed loop. After the controller calculates and compares the preset process temperature parameters, it dynamically adjusts the heating output power of the corresponding position of the electric disk 22. The closed-loop control realizes independent and precise temperature control of the corrugated roller in sections along the axial direction.

[0038] The above-described embodiments are merely one implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An energy-saving corrugating machine with intelligent segmented temperature control, comprising corrugating rollers (1), characterized in that, The corrugated roller (1) includes a cylindrical hollow structure and a roller body (11) with an outer wall made of magnetic metal. Inside the roller body (11) is a segmented electromagnetic heating device (2) that can independently adjust the heating power of each section. The corrugated roller (1) is also equipped with a segmented temperature measuring component (3) that can independently collect the temperature of each section, arranged along the axial direction of the corrugated roller (1). The segmented temperature measuring component (3) and the segmented electromagnetic heating device (2) are electrically connected to a programmable logic controller system.

2. The energy-saving corrugated machine with intelligent segmented temperature control according to claim 1, characterized in that, The segmented electromagnetic heating device (2) includes a central shaft (21) and an electric disk (22). The central shaft (21) has a hollow structure and is coaxially located inside the roller body (11). A number of electric disks (22) are arranged along the axial direction of the central shaft (21) and assembled on the outside of the central shaft (21). The disk surface of the electric disk (22) is arranged close to the inner wall of the corrugated roller (1). Each electric disk (22) is electrically connected to a programmable logic controller system. Each electric disk (22) can be started, stopped and its power adjusted independently.

3. The energy-saving corrugated machine with intelligent segmented temperature control according to claim 2, characterized in that, A cylindrical heat insulation layer (12) is coaxially fixed on the inner wall of the roller body (11), and the heat insulation layer (12) is located between the electric disk (22) and the roller body (11).

4. The energy-saving corrugated machine with intelligent segmented temperature control according to claim 3, characterized in that, It also includes a corrugated roller shaft (13), a frame (5) and roller bearings (6). The corrugated roller shaft (13) has two sections respectively sleeved on the outer sides of the two ends of the central shaft (21). The corrugated roller shaft (13) is rotatably connected to the central shaft (21). The corrugated roller shaft (13) is fixedly connected to the outer wall of the roller body (11) at both ends of the corrugated roller (1). The roller bearings (6) are rotatably connected to the outer side of the corrugated roller shaft (13). The bearing seat of the roller bearings (6) is fixedly connected to the frame (5).

5. The energy-saving corrugated machine with intelligent segmented temperature control according to claim 4, characterized in that, It also includes an adjusting clamp (4); one end of the central shaft (21) protrudes and has a radially through adjusting groove (23). The adjusting clamp (4) includes a rod (42), which passes through the adjusting groove (23). The adjusting clamp (4) clamps and fixes the bearing seat of the roller bearing (6), and can adjustably fix the rotation angle of the central shaft (21).

6. The energy-saving corrugated machine with intelligent segmented temperature control according to claim 5, characterized in that, The adjusting clamp (4) also includes a pair of arc-shaped clamps (41) and two operating handles (43). The two ends of the insert rod (42) are respectively hinged to the corresponding operating handles (43). The arc-shaped clamps (41) on both sides are respectively located on the outer periphery of the bearing seat. The ends of the arc-shaped clamps (41) and the operating handles (43) on the same side are hinged for transmission. Turning the operating handles (43) on both sides can drive the two arc-shaped clamps (41) to close or open with each other. When the arc-shaped clamps (41) are closed, they tighten and lock the bearing seat. When the arc-shaped clamps (41) are opened, they release the limiting and fixing of the bearing seat.

7. The energy-saving corrugated machine with intelligent segmented temperature control according to claim 4, characterized in that, The segmented temperature measurement component (3) includes a probe base (31) and multiple sets of infrared detection probes (32). The probe base (31) is strip-shaped and is fixed to the frame (5) along the axial direction of the corrugated roller (1) near the outside of the roller body (11). Multiple sets of infrared detection probes (32) are installed on the probe base (31). The infrared detection probes (32) are evenly arranged facing the outer wall of the roller body (11). The infrared detection probes (32) are electrically connected to the programmable logic controller system.

8. An energy-saving corrugated machine with intelligent segmented temperature control according to any one of claims 4-7, characterized in that, The corrugated roller (1) is provided in a pair, namely an upper corrugated roller and a lower corrugated roller. The outer walls of the upper corrugated roller and the lower corrugated roller mesh with each other. A pair of openable corrugated roller holders (51) are provided on the upper part of the frame (5). The pair of corrugated roller holders (51) respectively cover and limit the roller bearings (6) at both ends of the upper corrugated roller.

9. An energy-saving corrugated machine with intelligent segmented temperature control according to claim 8, characterized in that, The lower part of the frame (5) is provided with a pair of through-slot type lower corrugated adjustment grooves (52). The roller bearings (6) at both ends of the lower corrugated roller are slidably assembled inside the lower corrugated adjustment grooves (52). The center distance between the lower corrugated adjustment grooves (52) and the upper corrugated roller gradually decreases along the oblique depth direction. Adjustment rods (53) are respectively installed on the left and right sides of the frame (5). One end of the two adjustment rods (53) is respectively sleeved on the bearing seats of the roller bearings (6) at both ends of the lower corrugated roller. The other end of the adjustment rods (53) is respectively hinged to the outside of the frame (5). The two adjustment rods (53) respectively limit the sliding position of the roller bearings (6) at both ends of the lower corrugated roller in the lower corrugated adjustment grooves (52).

10. An energy-saving corrugated machine with intelligent segmented temperature control according to claim 9, characterized in that, The inner side of the lower corrugated adjustment groove (52) is provided with a limiting protrusion (54), which restricts the roller bearings (6) at both ends of the lower corrugated roller from moving inward along their own axis.

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