Bottom paper deviation rectifying device for foam production

Abstract

The invention relates to the technical field of foam production equipment, and discloses a backing paper deviation rectifying device for foam production, which comprises two groups of infrared correlation sensing modules, two groups of deviation rectifying mechanisms and a PLC (programmable logic controller), the two groups of infrared correlation sensing modules are symmetrically mounted on two sides of a backing paper conveying belt, the sensing modules are arranged in front to detect the position of backing paper, and the PLC controls the deviation rectifying mechanisms to act according to detection data. Through real-time detection of the sensing module, intelligent judgment of the PLC and cooperative execution of the deviation rectifying mechanism, automatic and real-time deviation rectifying of backing paper is achieved, manual intervention is not needed, and the automatic deviation rectifying device is suitable for a high-speed continuous production environment; the deviation rectifying mechanism comprises a main supporting frame, a guide rod, a driving pressing block, a steering roller, a pressing spring, a deviation rectifying pressing roller, a pressing assembly, a synchronous steering assembly and a servo motor driving assembly, and precise deviation rectifying is achieved through the cooperative action of pressure adjustment and angle adjustment.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of foam production equipment, in particular to a bottom paper deviation correcting device for foam production. BACKGROUND

[0002] In a current foam continuous production line, especially for the production of some special varieties of foam boards (such as polyurethane foam PU), the bottom paper needs to carry foam raw materials and complete continuous transmission, and needs to have a long bottom paper laying distance. The bottom paper often deviates in the transmission process due to uneven tension or deviation of guide rollers, affecting the forming quality of the foam. Most of the existing deviation correcting devices for the bottom paper need to rely on manual intervention, and the response speed is slow. Therefore, a bottom paper deviation correcting device for foam production is developed. SUMMARY

[0003] In view of the above problems existing in the prior art, the purpose of the application is to provide a bottom paper deviation correcting device for foam production, which realizes full-automatic detection and correction of the deviation of the bottom paper through "detection-judgment-execution" closed-loop control.

[0004] The application adopts the following technical scheme: a bottom paper deviation correcting device for foam production, comprising two groups of sensing modules, two groups of deviation correcting mechanisms and a PLC controller. The deviation correcting mechanism comprises a main support frame, a support ear plate, a guide rod, a driving pressure block, a steering roller, two compression springs, a deviation correcting pressure roller, a compression assembly, a synchronous steering assembly and a driving assembly. The guide rod is vertically fixed between the main support frame and the support ear plate, and the driving pressure block, the steering roller and the two compression springs are sleeved on the outer wall of the guide rod. The deviation correcting pressure roller is installed on the side wall of the steering roller and above the bottom paper conveying belt. The driving assembly is connected with the compression assembly, the compression assembly is connected with the driving pressure block, and the synchronous steering assembly is connected with the compression assembly and the steering roller respectively. The PLC controller is electrically connected with the sensing module and the driving assembly respectively. According to the detection data of the sensing module, the PLC controller controls the driving assembly to drive the compression assembly and the synchronous steering assembly to act cooperatively, so as to correct the deviation of the bottom paper.

[0005] As a further improvement of the above scheme, the two groups of sensing modules and the two groups of deviation correcting mechanisms are symmetrically fixed on the left and right sides of the bottom paper conveying belt, and the sensing module is arranged on the front side of the deviation correcting mechanism. The PLC controller is fixed on one side of the bottom paper conveying belt.

[0006] As a further improvement of the above scheme, the deviation correcting pressure roller comprises a support shaft and a guide roller. The support shaft is detachably mounted on the side wall of the steering roller, the guide roller is sleeved on the outer wall of the support shaft, and a bearing is mounted at the connection between the guide roller and the support shaft, so that the guide roller can rotate flexibly around the support shaft and the rotating wear is reduced.

[0007] As a further improvement of the above-mentioned scheme, the pressing assembly comprises a driving shaft, a pressing gear and a pressing rack. The driving shaft is mounted on the side wall of the main support frame through a bearing, and one end of the driving shaft is connected with the driving assembly; the pressing gear is sleeved on the other end of the driving shaft; and the pressing rack is fixed on the side wall of the driving block and is in mesh with the pressing gear.

[0008] As a further improvement of the above-mentioned scheme, the synchronous steering assembly comprises a synchronous shaft, a driving bevel gear, a transmission bevel gear, a steering gear and an arc-shaped rack. The synchronous shaft is vertically mounted on the bottom of the main support frame through a bearing; the driving bevel gear is sleeved on the outer wall of the driving shaft and does not contact the pressing gear; the transmission bevel gear is sleeved on the top end of the synchronous shaft and is in mesh with the driving bevel gear; the steering gear is sleeved on the bottom end of the synchronous shaft; and the arc-shaped rack is fixedly mounted on the side wall of the steering roller and is in mesh with the steering gear.

[0009] As a further improvement of the above-mentioned scheme, the driving assembly comprises a servo motor and a speed reducer. The output shaft of the servo motor is connected with the input end of the speed reducer through a shaft coupling, and the output end of the speed reducer is connected with one end of the driving shaft through a shaft coupling. By controlling the rotating speed and direction of the servo motor, the stable driving force for the pressing assembly is provided after the speed reduction and torque increase of the speed reducer.

[0010] As a further improvement of the above-mentioned scheme, two pressing springs are respectively arranged between the driving block and the steering roller and between the steering roller and the support ear plate. The pre-tightening elastic force of the pressing springs can stably support the steering roller at the middle part of the guide rod, and the contact pressure between the deviation correcting pressure roller and the base paper can be accurately changed by instantaneously adjusting the compression amount of the pressing spring.

[0011] As a further improvement of the above-mentioned scheme, the sensing module is an infrared transmitting-receiving sensor, which is used for detecting the edge position of the base paper and transmitting the deviation data to the PLC controller. When the left sensing module detects the deviation of the base paper, the PLC controller outputs a control signal to the right deviation correcting mechanism to perform the deviation correcting operation. When the right sensing module detects the deviation of the base paper, the PLC controller controls the left deviation correcting mechanism to perform the deviation correcting operation.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention requires no manual intervention. It achieves automatic and real-time correction of the bottom paper through real-time detection by the sensing module, intelligent judgment by the PLC controller, and coordinated execution by the correction mechanism. It is suitable for high-speed continuous production environments. This invention achieves simultaneous execution of "pressure adjustment + angle adjustment" through the coordinated action of the clamping component and the synchronous steering component, ensuring long-term stable operation of the device and reducing the impact of environmental interference on the correction effect. Attached Figure Description

[0013] Figure 1 This is a three-dimensional perspective view of the backing paper correction device for foam production according to the present invention; Figure 2 This is a three-dimensional perspective view of the correction mechanism of the foam production base paper correction device of the present invention from the side view direction. Figure 3 This is an enlarged view of part A of the correction mechanism of the base paper correction device for foam production of the present invention; Figure 4 This is a three-dimensional perspective view of the correction mechanism of the foam production base paper correction device of the present invention from the perspective of looking up. Figure 5 This is an enlarged view of part B of the correction mechanism of the foam production base paper correction device of the present invention; Figure 6 This is a three-dimensional view of the correction mechanism of the foam production base paper correction device of the present invention from a top view. Figure 7 This is an enlarged view of part C of the correction mechanism of the base paper correction device for foam production of the present invention; Figure 8 This is a diagram showing the bottom paper correction device for foam production of the present invention installed on the bottom paper conveyor belt.

[0014] Explanation of key symbols: 1. Sensing module; 2. Correction mechanism; 21. Main support frame; 22. Support ear plate; 23. Guide rod; 24. Drive pressure block; 25. Steering roller; 26. Pressure spring; 27. Correction pressure roller; 271. Support shaft; 272. Guide roller; 28. Pressure assembly; 281. Drive shaft; 282. Pressure gear; 283. Pressure rack; 29. ​​Synchronous steering assembly; 291. Synchronous shaft; 292. Drive bevel gear; 293. Transmission bevel gear; 294. Steering gear; 295. Arc rack; 30. Drive assembly; 301. Servo motor; 302. Reducer; 3. PLC controller. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0016] Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0017] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0018] To keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of known functions and known components are omitted.

[0019] In current continuous foam production lines, especially for some special types of foam (polyurethane foam, PU), the base paper needs to carry the foam raw materials and complete continuous transport, requiring a long base paper laying distance (typically 15-30m). During transport, the base paper often deviates due to uneven tension or guide roller deviation, affecting the foam molding quality. Most existing base paper correction devices rely on manual intervention, resulting in slow response times. Please refer to... Figures 1-8 As shown in the figure, an embodiment of the present invention provides a base paper correction device for foam production, comprising: two sets of sensing modules 1, two sets of correction mechanisms 2, and a PLC controller 3. The two sets of sensing modules 1 (preferably infrared through-beam sensors, which determine deviation by detecting the occlusion signal at the edge of the base paper, with a detection distance of 50-300mm, a response time ≤0.1ms, and a detection accuracy of ±0.05mm; the distance between the transmitting and receiving ends of the sensing module 1 is the base paper width + 10mm, e.g., if the base paper width is 1200mm, the distance is set to 1210mm) and the two sets of correction mechanisms 2 are symmetrically installed on the left and right sides of the base paper conveyor belt by bolts, with the sensing modules 1 positioned in front of the correction mechanisms 2. The distance between the sensing modules 1 and the correction mechanisms 2 is controlled at 300-600mm (e.g., ...). Figure 8As shown, the "front side" is defined along the bottom paper conveying direction. The PLC controller 3 is attached to one side of the bottom paper conveyor belt, and the PLC controller 3 transmits detection data to the sensing module 1 via wired communication (such as an RS485 bus). Based on this data, the PLC controller 3 controls the action of the correction mechanism 2. (The preferred PLC controller 3 model is Siemens S7-1200, with a sampling frequency of 100Hz and a built-in correction control algorithm. When a deviation signal is received, it first compares it to a preset threshold (the standard threshold is 1mm, which can be adjusted according to the type of foam). If the deviation is <1mm, it is judged as a "minor deviation," and the correction action is not performed.) If the deviation is ≥1mm, it is determined to be in a "correction required" state. A control command is generated according to the deviation direction (the right correction mechanism 2 is activated when the deviation is to the left, and the left correction mechanism 2 is activated when the deviation is to the right). When the left sensing module 1 detects the deviation of the bottom paper, the PLC controller 3 outputs a control signal to the right correction mechanism 2 to perform the correction operation; when the right sensing module 1 detects the deviation of the bottom paper, the PLC controller 3 controls the left correction mechanism 2 to perform the correction operation. Through the "detection-judgment-execution" closed-loop control, automatic and real-time correction of the bottom paper is achieved without manual intervention, which is suitable for high-speed continuous production environments. Correction mechanism 2 is the core execution unit of this solution. To further illustrate the structure of correction mechanism 2, as follows... Figures 2-7As shown, the correction mechanism 2 includes a main support frame 21 and a support ear plate 22 (both the main support frame 21 and the support ear plate 22 are fixedly connected to the side wall of the bottom paper conveyor belt by bolts). A guide rod 23 is vertically fixed between the main support frame 21 and the support ear plate 22 by threads. A slidable drive block 24 and a guide roller 25 are sleeved on the outer wall of the guide rod 23 (both the drive block 24 and the guide roller 25 have vertically provided guide holes in the middle, and the guide holes and the guide rod 23 are clearance-fitted with a clearance of 0.02-0.05mm to ensure smooth sliding). A guide rod 24 is installed between the drive block 24 and the guide roller 25, and between the guide roller 25 and the support ear plate 22. Equipped with a compression spring 26, the preload of the compression spring 26 can stably support the steering roller 25 in the middle of the guide rod 23. By instantaneously adjusting the compression of the compression spring 26, the contact pressure between the correction roller 27 and the bottom paper can be precisely changed. A correction roller 27 is fixed to the side wall of the steering roller 25 and is positioned above the bottom paper conveyor belt. The correction roller 27 includes a support shaft 271 and a guide roller 272 (the guide roller 272 is made of rubber to ensure sufficient static friction when in contact with the bottom paper, preventing slippage). The support shaft 271 is secured by a threaded connection. The guide roller 272 is fixedly installed on the side wall of the guide roller 25 and uses a threaded connection to facilitate the disassembly and replacement of the support shaft 271. The guide roller 272 is sleeved on the outer wall of the support shaft 271, and a wear-resistant bearing is provided at the connection between the guide roller 272 and the support shaft 271. This ensures that the guide roller 272 can rotate flexibly around the support shaft 271, while reducing rotational wear and extending service life. A clamping assembly 28 for driving the pressure block 24 to move up and down is provided between the drive pressure block 24 and the main support frame 21. The clamping assembly 28 can be used to instantly press down the drive pressure block 24 during correction, thereby changing the pressure of the upper clamping spring 26 on the guide roller 25, and realizing the alignment of the correction roller 27 with the bottom paper. Rapid adjustment of contact pressure; a synchronous steering component 29 is provided between the pressing component 28 and the steering roller 25, which can simultaneously drive the steering roller 25 to rotate while the pressing component 28 presses down on the driving block 24 (response time ≤0.1s). The steering roller 25 drives the correction roller 27 to rotate, thereby changing the contact angle between the correction roller 27 and the bottom paper while adjusting the contact pressure, thus improving the correction accuracy; a driving component 30 for driving is provided on the side wall of the main support frame 21, wherein the driving component 30 includes a servo motor 301 (rated power of 0.75kW, control accuracy of ±0.The servo motor 301 (01 rad) and the reducer 302 (reduction ratio 1:20) are connected by a coupling. The output shaft of the servo motor 301 is connected to the input shaft of the reducer 302, and the output shaft of the reducer 302 is connected to the clamping assembly 28. By controlling the speed and direction of the servo motor 301, the reducer 302 reduces the speed and increases the torque, providing a stable driving force to the clamping assembly 28. like Figures 2-3 As shown, the clamping assembly 28 includes a drive shaft 281, a clamping gear 282, and a clamping rack 283. The drive shaft 281 is rotatably mounted laterally on the side wall of the main support frame 21 via a tapered roller bearing, and one end of the drive shaft 281 is connected to the output end of the reducer 302 via a coupling. The clamping gear 282 is sleeved on the end of the drive shaft 281 away from the reducer 302, and the clamping gear 282 and the drive shaft 281 are connected by a metal key (a key is provided on the inner side wall of the clamping gear 282 and the outer wall of the drive shaft 281). With matching keyways, the clamping rack 283 is fixed to the side wall of the drive block 24 by bolts, and the clamping rack 283 and the clamping gear 282 mesh with each other. During operation, the drive assembly 30 drives the drive shaft 281 to rotate, which in turn drives the clamping gear 282 to rotate. Through the meshing transmission of the clamping gear 282, the clamping rack 283 moves downward instantaneously, which ultimately drives the drive block 24 to slide downward along the outer wall of the guide rod 23, thereby realizing the rapid adjustment of the compression amount of the upper clamping spring 26, and thus changing the contact pressure between the correction roller 27 and the bottom paper. like Figures 4-7As shown, the synchronous steering assembly 29 includes a synchronous shaft 291, a drive bevel gear 292, a transmission bevel gear 293, a steering gear 294, and an arc-shaped rack 295. The synchronous shaft 291 is vertically rotatably mounted on the bottom of the main support frame 21 via bearings. The drive bevel gear 292 is sleeved on the outer wall of the drive shaft 291 (matching keyways are provided on the inner cavity sidewall of the drive bevel gear 292 and the outer wall of the drive shaft 281, allowing the drive bevel gear 292 and the drive shaft 281 to be connected by a metal key), and the drive bevel gear 292 does not contact the clamping gear 282 to avoid motion interference. The transmission bevel gear 293 is sleeved on the top of the synchronous shaft 291 (matching keyways are provided on the inner cavity sidewall of the transmission bevel gear 293 and the outer wall of the end of the synchronous shaft 291, allowing the two to be connected by a metal key). The drive bevel gear 293 and drive bevel gear 292 are meshed together. The steering gear 294 is sleeved and installed at the bottom end of the synchronous shaft 291. The steering gear 294 is locked and fixed by double nuts (the outer wall of the bottom end of the synchronous shaft 291 is provided with matching external threads) (the double nuts are respectively set on the upper and lower sides of the steering gear 294 to prevent loosening). The arc rack 295 is fixed to the side wall of the steering roller 25 by bolts. The arc rack 295 and the steering gear 294 are meshed together. When the drive assembly 30 drives the drive shaft 281 to rotate, the drive bevel gear 292 is synchronously driven to rotate. The rotation is transmitted to the synchronous shaft 291 through the drive bevel gear 293, which drives the steering gear 294 to rotate. Then, the arc rack 295 drives the steering roller 25 to rotate, and finally the angle adjustment of the correction pressure roller 27 is realized.

[0020] After receiving the instruction, the drive component 30 immediately starts. Through the coordinated action of the clamping component 28 and the synchronous steering component 29, the "pressure adjustment + angle adjustment" is executed synchronously, ensuring the long-term stable operation of the device and reducing the impact of environmental interference on the correction effect. The completion time of a single correction action is ≤0.1s, and the accuracy of the bottom paper reset after correction is ±0.5mm. After reset, the sensor module 1 continuously monitors the paper. If the deviation drops back to <0.5mm, it is determined that the "correction is completed" and the drive component 30 stops working, effectively ensuring the stability of the correction under high-speed transmission.

[0021] Work process: Before starting the production line, set the correction threshold (1mm) and the bottom paper width (1200mm) in the PLC controller 3 through the control computer; check the alignment status of the sensing module 1 and the flexibility of the movement of each component of the correction mechanism 2 to ensure that there is no jamming or abnormal noise; After the production line starts, the base paper is transported at a speed of 25m / min. The sensing module 1 detects the edge position of the base paper in real time. When the base paper is deviated to the left, the signal of the left sensing module 1 is blocked for ≥0.5s (corresponding to a deviation of 0.5mm, which does not reach the threshold). The PLC controller 3 determines this as a "minor deviation" and does not perform any action. When the blocking time is ≥2s (corresponding to a deviation of 2mm, which exceeds the threshold), the left sensing module 1 transmits the "left deviation 2mm" signal to the PLC via the RS485 bus (transmission delay ≤0.05s). After receiving the signal, the PLC controller 3 compares it with the preset threshold (1mm) and determines that it is in a "correction state". It then generates a control command to "activate the right correction mechanism 2" and transmits the command to the servo motor 301 of the right correction mechanism 2 via a cable. The servo motor 301 starts and, after being reduced in speed by the reducer 302, drives the drive shaft 281 of the clamping assembly 28 to rotate. The drive shaft 281 drives the clamping gear 282 to rotate, and through meshing transmission, the clamping rack 283 moves downward, driving the pressure block 24 to slide down along the guide rod 23, compressing the upper clamping spring 26 (the compression amount increases from 15mm to 18mm, the displacement of the steering roller 25 is small, and it will not cause the steering gear 294 to disengage from the arc-shaped rack 295). The contact pressure of the correction roller 27 on the bottom paper increases from 1.2N to 1.8N. At the same time, the drive shaft 281 drives the drive bevel gear 292 to rotate, and through the transmission bevel gear 293 drives the synchronous shaft 291 to rotate. The steering gear 294 rotates accordingly, causing the arc rack 295 and the steering roller 25 to rotate counterclockwise by 15°. The contact angle between the correction pressure roller 27 and the bottom paper changes, generating a lateral correction force. After 0.1s of correction, the skew of the bottom paper decreases, and the sensing module 1 transmits a "normal" signal to the PLC. The PLC controller 3 determines that the correction is complete, controls the servo motor 301 to stop, and drives the pressure block 24 to reset under the elastic force of the pressure spring 26. The correction mechanism 2 returns to its initial state. The sensing module 1 continues to monitor and enters the next detection cycle.

[0022] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A paper correction device for foam production, comprising two sets of sensing modules (1), two sets of correction mechanisms (2), and a PLC controller (3). The correction mechanism (2) includes a main support frame (21), a support ear plate (22), a guide rod (23), a drive pressure block (24), a steering roller (25), two pressure springs (26), a correction pressure roller (27), a pressure assembly (28), a synchronous steering assembly (29), and a drive assembly (30). The guide rod (23) is vertically fixed between the main support frame (21) and the support ear plate (22), and the driving pressure block (24), the steering roller (25) and the two clamping springs (26) are sleeved on the outer wall of the guide rod (23); The correction roller (27) is installed on the side wall of the guide roller (25) and located above the bottom paper conveyor belt; The drive assembly (30) is connected to the clamping assembly (28), the clamping assembly (28) is connected to the drive block (24), and the synchronous steering assembly (29) is connected to the clamping assembly (28) and the steering roller (25) respectively; The PLC controller (3) is electrically connected to the sensing module (1) and the drive component (30) respectively. According to the detection data of the sensing module (1), the PLC controller (3) controls the drive component (30) to drive the pressing component (28) and the synchronous steering component (29) to work together to achieve bottom paper correction.

2. The foam production base paper correction device as described in claim 1, characterized in that, The two sets of sensing modules (1) and the two sets of correction mechanisms (2) are symmetrically fixed on the left and right sides of the bottom paper conveyor belt, and the sensing module (1) is located on the front side of the correction mechanism (2), and the PLC controller (3) is fixed on one side of the bottom paper conveyor belt.

3. The foam production base paper correction device as described in any one of claims 1 or 2, characterized in that, The correction roller (27) includes a support shaft (271) and a guide roller (272). The support shaft (271) is detachably mounted on the side wall of the steering roller (25), and the guide roller (272) is sleeved on the outer wall of the support shaft (271). A bearing is installed at the connection between the guide roller (272) and the support shaft (271), which ensures that the guide roller (272) can rotate flexibly around the support shaft (271) and reduces rotational wear.

4. The foam production base paper correction device as described in any one of claims 1 or 2, characterized in that, The clamping assembly (28) includes a drive shaft (281), a clamping gear (282), and a clamping rack (283). The drive shaft (281) is mounted on the side wall of the main support frame (21) via a bearing, and one end of the drive shaft (281) is connected to the drive assembly (30); the clamping gear (282) is sleeved and mounted on the other end of the drive shaft (281); the clamping rack (283) is fixed on the side wall of the drive block (24), and the clamping rack (283) and the clamping gear (282) mesh with each other.

5. The foam production base paper correction device as described in claim 4, characterized in that, The synchronous steering assembly (29) includes a synchronous shaft (291), a drive bevel gear (292), a transmission bevel gear (293), a steering gear (294), and an arc-shaped rack (295). The synchronous shaft (291) is vertically mounted on the bottom of the main support frame (21) via bearings; the drive bevel gear (292) is sleeved on the outer wall of the drive shaft (281) and does not contact the clamping gear (282); the transmission bevel gear (293) is sleeved on the top of the synchronous shaft (291) and meshes with the drive bevel gear (292); the steering gear (294) is sleeved on the bottom of the synchronous shaft (291); the arc rack (295) is fixedly mounted on the side wall of the steering roller (25) and meshes with the steering gear (294).

6. The foam production base paper correction device as described in claim 4, characterized in that, The drive assembly (30) includes a servo motor (301) and a reducer (302). The output shaft of the servo motor (301) is connected to the input end of the reducer (302) via a coupling, and the output end of the reducer (302) is connected to one end of the drive shaft (281) via a coupling. By controlling the speed and direction of the servo motor (301), the torque is reduced and increased by the reducer (302) to provide a stable driving force for the clamping assembly (28).

7. The foam production base paper correction device as described in claim 1, characterized in that, The two compression springs (26) are respectively set between the drive pressure block (24) and the steering roller (25), and between the steering roller (25) and the support ear plate (22). By utilizing the pre-tightening force of the compression springs (26), the steering roller (25) can be stably supported in the middle of the guide rod (23). Furthermore, by instantly adjusting the compression amount of the compression springs (26), the contact pressure between the correction roller (27) and the bottom paper can be precisely changed.

8. The foam production base paper correction device as described in claim 2, characterized in that, The sensing module (1) is an infrared photoelectric sensor used to detect the edge position of the bottom paper and transmit the skew data to the PLC controller (3). When the left sensing module (1) detects the skew of the bottom paper, the PLC controller (3) outputs a control signal to the right correction mechanism (2) to perform the correction operation. When the right sensing module (1) detects the skew of the bottom paper, the PLC controller (3) controls the left correction mechanism (2) to perform the correction operation.

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