A cloth laying mechanism for air-tight fabric

Abstract

The application belongs to the technical field of cutting bed equipment, and particularly relates to a cloth paving mechanism for air-tight fabric. The application provides a cloth paving mechanism for air-tight fabric. The application provides a cloth paving mechanism for air-tight fabric, which comprises a rack, a feeding device, a table top and an exhaust device. The exhaust device comprises an exhaust roller and a floating support. The exhaust roller is in light pressure contact with the fabric to be paved under the action of the floating support at a limited pressure, so that the surface linear velocity of the fabric is less than the fabric paving linear velocity, a relative sliding is formed between the fabric, and the interlayer air is discharged to the two sides of the cloth width under the action of the sliding difference. As a result, the application effectively eliminates the interlayer air retention during the paving of the high air-tight coating fabric on the basis of reducing the coating damage and not causing the accumulation of wrinkles.

Description

Technical Field

[0001] This invention belongs to the technical field of cutting bed equipment, and particularly relates to a fabric laying mechanism for airtight fabrics. Background Technology

[0002] In the cutting table, a fabric spreading machine is needed to lay rolls of fabric layer by layer onto the cutting table for subsequent cutting. One type of fabric is particularly difficult to lay properly, such as PU-coated jacket fabric, TPU composite film fabric, and fabrics used before and after seam sealing, which have high airtightness. When these fabrics are laid in multiple layers, large areas of air can easily become trapped between the layers to be laid and those already laid. In actual production, this trapping often manifests as both large areas of thin air trapping and localized closed air pockets, resulting in localized bulges on the fabric surface, unstable edge adhesion, uneven thickness after multiple layers are stacked, increased positioning errors during cutting, and fluctuations in the size of the cut pieces.

[0003] To address this problem, existing technologies employ two approaches: one is to use an exhaust roller to press down on the fabric with its own weight, expelling air, and then using a tension spring to reduce the downward pressure of the roller and prevent damage to the fabric; the other is to use a lifting pressure rod to press down on the fabric after it is laid out, preventing air from entering between layers. For example, Chinese utility model patent CN223632793U discloses a weight-based exhaust mechanism for fabric laying in a fabric spreading machine, including a crossbeam and an exhaust roller. Both ends of the crossbeam are fixedly connected to a sliding groove bracket, and the inner wall of the sliding groove bracket is fixedly connected to a sliding groove insert. Both ends of the exhaust roller are provided with sliding bearings and rolling bearings, and both ends of the exhaust roller are provided with fixing rings. A lower support is provided on the outer wall of the rolling bearings and fixing rings, and a tension spring is fixedly connected to the upper surface of the lower support. The top of the tension spring is fixedly connected to the inner top wall of the sliding groove bracket.

[0004] The exhaust mechanism in this patent has the following basic structural principle: the exhaust roller's own weight causes the sliding bearing to slide up and down on the inner wall of the slide groove block. At the same time, the tension provided by the tension spring pulls the lower bracket to increase the upward tension, thereby reducing the downward pressure of the exhaust roller and preventing damage to the fabric. Finally, the air in the fabric is discharged through the downward pressure of the exhaust roller.

[0005] However, the existing technology still has the following shortcomings in actual use, which are the technical problems that this invention aims to solve: 1. It cannot complete the air exhaust at the moment of laying the fabric, and can only exhaust the air after laying; 2. Simple downward pressure exhaust cannot actively drive away the air, lacks an airflow path, and cannot effectively remove the air trapped between layers; 3. The pressure of the passively rotating roller is not easy to control. Too light a pressure will affect the effect, and too heavy a pressure will damage the coating.

[0006] In conclusion, it is necessary to develop a fabric layout structure suitable for high airtightness fabrics to solve this problem. Summary of the Invention

[0007] This invention provides a fabric laying mechanism for airtight fabrics, including a frame, a feeding device, a table, and an exhaust device. The exhaust device includes an exhaust roller and a floating support. Under the action of the floating support, the exhaust roller makes light contact with the fabric to be laid with a limited pressure, so that its surface linear velocity is less than the fabric laying linear velocity, forming relative sliding between the roller and the fabric. This guides the interlayer air to be discharged to both sides of the fabric width under the action of the slip difference. This invention effectively eliminates the interlayer trapped air during the laying of high airtight coated fabrics, while reducing coating damage and preventing wrinkles and material accumulation.

[0008] This invention overcomes the shortcomings of existing technologies and provides a fabric laying mechanism for airtight fabrics, including a frame, a feeding device, a table, and an exhaust device disposed above the table. The exhaust device includes an exhaust roller and a floating support member disposed on the frame for supporting the exhaust roller and applying pressure to the fabric. The exhaust roller includes an exhaust roller body disposed above the fabric, and air-guiding patterns extending from the center of the fabric width to both sides of the fabric width on the surface of the exhaust roller body. The floating support member includes a first cylinder with its tail end hinged to the frame, an outer hollow synchronous shaft disposed parallel to the exhaust roller, an inner drive shaft disposed within the outer hollow synchronous shaft via bearings, and an exhaust roller bearing disposed on the exhaust roller. The system includes an exhaust roller bearing housing, a swing arm with one end fixed to the outer hollow synchronous shaft and the other end fixed to the exhaust roller bearing housing, a drive wheel located on the end of the inner drive shaft exposed above the outer hollow synchronous shaft, a driven wheel located on the end of the exhaust roller and connected to the drive wheel via a synchronous belt drive, and a motor for driving the drive wheel. The outer hollow synchronous shaft and the piston rod end of the first cylinder are hinged together by a bearing. The extension and retraction of the first cylinder drives the outer hollow synchronous shaft to rotate, thereby causing the exhaust roller to move closer to / away from the fabric. The motor controls the surface linear velocity of the exhaust roller to be less than the laying linear velocity of the fabric, so that the exhaust roller and the fabric form relative sliding.

[0009] A further preferred technical solution includes a tension isolation element disposed between the feeding device and the exhaust device for absorbing the fabric length difference caused by the exhaust roller.

[0010] A further preferred technical solution includes a pre-venting component disposed upstream of the venting roller and applying pressure to the front end of the interlayer contact of the fabric.

[0011] A further preferred technical solution is that the tension isolation component includes an isolation roller arranged parallel to the exhaust roller, a rocker arm with one end hinged to the frame and the other end connected to the end of the isolation roller via a bearing, and a second cylinder with its tail end hinged to the frame and its piston rod end hinged to the rocker arm.

[0012] A further preferred technical solution is that the pre-exhaust component includes a third cylinder vertically mounted on the frame, a pre-exhaust roller bearing seat disposed at the piston rod end of the third cylinder, and a pre-exhaust roller whose end is connected to the pre-exhaust roller bearing seat via a bearing.

[0013] A further preferred technical solution is that it also includes a guide member disposed on the table surface and located at the side end of the fabric.

[0014] A further preferred technical solution is that the air guide pattern is a spiral pattern, and is symmetrically arranged with the axial center line of the exhaust roller as the axis, and the arc transition at the intersection makes the air guide pattern continuously arranged.

[0015] A further preferred technical solution is that: the exhaust roller body is divided into a left roller section, a middle roller section and a right roller section along the axial direction, and the helix angle of the air guiding pattern on the surface of the middle roller section is greater than the helix angle of the air guiding pattern on the surface of the left roller section and the right roller section.

[0016] A further preferred technical solution includes a control system, which comprises a main controller and a detection unit.

[0017] The beneficial effects of this invention are at least as follows: 1. It changes the existing exhaust method from simple pressure to rolling drive, relying on the relative sliding between the exhaust roller surface and the fabric surface, which not only improves the exhaust effect but also protects the fabric to a certain extent; 2. It sets a clear path for the discharge of trapped air; 3. The exhaust method is easy to control and can be adjusted according to actual working conditions; 4. The exhaust roller can be continuously adjusted in position while ensuring stable rotation, adapting to more application scenarios. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a side view of the present invention; Figure 4 This is a side view of the present invention with the single-sided frame side panel hidden. Figure 5 for Figure 4 A magnified view of a portion of the image.

[0020] The meanings of the various reference numerals in the figure are as follows: Fabric a; 1. Frame; 2. Feeding device; 3. Table; 4. Exhaust device; 5. Tension isolation component; 6. Pre-exhaust component; Exhaust roller 41, floating support 42, isolation roller 51, rocker arm 52, second cylinder 53, third cylinder 61, pre-exhaust roller bearing seat 62, pre-exhaust roller 63; Exhaust roller body 411, air guide pattern 412, first cylinder 421, outer hollow synchronous shaft 422, inner drive shaft 423, exhaust roller bearing 424, exhaust roller bearing seat 425, swing arm 426, drive wheel 427, driven wheel 428. Detailed Implementation

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0022] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc., mentioned or possibly mentioned in this specification are defined relative to the structure shown in the accompanying drawings. The terms "inner" and "outer" refer to the direction toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0023] As attached Figures 1-5As shown, a fabric laying mechanism for airtight fabrics includes a frame 1, a feeding device 2, a table 3, and an exhaust device 4 disposed above the table 3. The exhaust device 4 includes an exhaust roller 41 and a floating support member 42 disposed on the frame 1 for supporting the exhaust roller 41 and applying pressure to the fabric a. The exhaust roller 41 includes an exhaust roller body 411 disposed above the fabric a, and air guiding patterns 412 disposed on the surface of the exhaust roller body 411 extending from the middle of the fabric width to both sides of the fabric width. The floating support member 42 includes a first cylinder 421 with its tail end hinged to the frame 1, an outer hollow synchronous shaft 422 disposed parallel to the exhaust roller 41, an inner drive shaft 423 disposed within the outer hollow synchronous shaft 422 via bearings, an exhaust roller bearing 424 disposed on the exhaust roller 41, and an exhaust roller bearing seat 425 disposed on the exhaust roller 41. A swing arm 426, with one end fixed on the outer hollow synchronous shaft 422 and the other end fixed on the exhaust roller bearing seat 425, a drive wheel 427, located on the end of the inner drive shaft 423 exposed on the outer hollow synchronous shaft 422, a driven wheel 428, located on the end of the exhaust roller 41 and connected to the drive wheel 427 via a synchronous belt drive, and a motor for driving the drive wheel 427, are provided. The outer hollow synchronous shaft 422 and the piston rod end of the first cylinder 421 are hinged by a bearing. The extension and retraction of the first cylinder 421 drives the outer hollow synchronous shaft 422 to rotate, thereby causing the exhaust roller 41 to move closer to / away from the fabric a. The motor controls the surface linear velocity of the exhaust roller 41 to be less than the laying linear velocity of the fabric a, so that the exhaust roller 41 and the fabric a form relative sliding.

[0024] The frame 1 is the supporting structure of the entire mechanism, including left and right side plates and transverse connecting beams. The feeding device 2 is installed upstream of the left and right side plates. The feeding device 2 is a commonly used fabric spreading machine or fabric laying guide roller structure in existing technology, including a fabric roll support mechanism, an active feeding roller, a driven pressure roller, and several guide rollers. The active feeding roller is driven by a feeding motor, determining the feeding speed of fabric a. The transverse connecting beam connects the left and right side plates into a single frame. The side plates also have cylinder mounting seats, bearing mounting plates, and electrical mounting plates. The cylinder mounting seats are used to install the first cylinder 421, the second cylinder 53, and the third cylinder 61. The bearing mounting plates support the bearings of multiple roller shafts. The electrical mounting plates are used to install the main controller, solenoid valves, and pressure reducing valves, etc. The table 3 is the laying surface of the cutting bed. Layers of fabric are stacked on the table 3. The exhaust device 4 handles the top layer of fabric, which is currently being laid.

[0025] The exhaust device 4 is the core of this invention, comprising an exhaust roller 41 and a floating support 42 disposed above fabric a. The exhaust roller 41 includes an exhaust roller body 411 and air-guiding patterns 412. The exhaust roller body 411 is a circular roller spanning the entire fabric width, with a length slightly greater than the fabric width. Its surface is covered with an elastic rubber layer made of polyurethane rubber. The air-guiding patterns 412 are formed on the outer surface of this rubber layer. When the exhaust roller 41 slides relative to fabric a, the air-guiding patterns 412 guide the air in the contact area to both sides of the fabric width along the width direction. The floating support 42 is disposed on the frame 1 and has two functions: supporting the exhaust roller 41 and applying pressure to the fabric a, and driving the exhaust roller 41 to rise and fall. The inner drive shaft 423 and the outer hollow synchronous shaft 422 form a coaxial double-layer shaft set, simultaneously satisfying the two functions of independently driving the exhaust roller to rotate and driving the exhaust roller to move closer to / away from the fabric surface. The outer hollow synchronous shaft 422 itself does not transmit driving torque; it only reciprocates slightly around its own axis when the piston rod of the first cylinder 421 extends and retracts. This, through the rigid component 426, drives the exhaust roller to swing in an arc around the axis of the outer hollow synchronous shaft 422, thus changing the position of the exhaust roller. The inner drive shaft 423 is mounted inside the outer hollow synchronous shaft 422 via bearings and rotates freely within it. The inner drive shaft 423 only drives the motor when supporting the outer hollow synchronous shaft. The rotation is conveyed to the exhaust roller. The inner drive shaft 423 is longer than the outer hollow synchronous shaft 422, so its end is sufficiently exposed to install the drive wheel 427. The drive wheel 427 and the driven wheel 428 at the end of the exhaust roller 41 are located on the same plane. The motor is mounted on the side plate of the frame, driving the drive wheel 427 to rotate, which in turn drives the driven wheel and the exhaust roller 41 to rotate via the synchronous belt. The positions of the motor, the inner drive shaft 423, and the outer hollow synchronous shaft 422 remain fixed. The exhaust roller 41 completes the lifting and lowering under the action of the first cylinder. Preferably, one swing arm 426 is provided on each side of the fabric width to ensure synchronous operation at both ends.

[0026] In this embodiment, the cylinder is more compliant than other pressurization methods, and the motor is a servo motor. The linear speed of the exhaust roller 41 is controlled by controlling the output speed of the motor. The difference between the linear speed of the fabric laying and the linear speed of the exhaust roller 41 surface is the ratio of the linear speed of the fabric laying to the linear speed of the fabric laying. The value of the slip difference rate is controlled within the range of 5% to 30%. This is to avoid the roller surface and the fabric surface being too synchronized when the value is below 5%, which would result in the exhaust roller 41 degenerating into an ordinary passive pressure roller. Controlling it to no more than 30% is to avoid the roller surface rubbing too far on the fabric surface per unit time, which would cause damage due to frictional heat between the fabric and the rubber. In actual operation, it should be noted that the exhaust roller 41 is not a downstream feeding roller and does not determine the forward speed of fabric a. The forward speed of fabric a is determined by the active feeding roller of the feeding device 2. Therefore, the exhaust roller 41 cannot form a strong clamp with the upstream roller, and the traction capacity of the feeding device 2 must be significantly greater than the resistance force caused by the exhaust roller 41.

[0027] As a preferred embodiment, it further includes a tension isolator 5 disposed between the feeding device 2 and the exhaust device 4 for absorbing the fabric length difference caused by the exhaust roller 41; the tension isolator 5 includes an isolation roller 51 disposed parallel to the exhaust roller 41, a rocker arm 52 with one end hinged to the frame 1 and the other end connected to the end of the isolation roller 51 via a bearing, and a second cylinder 53 with its tail end hinged to the frame 1 and the piston rod end hinged to the rocker arm 52.

[0028] In this embodiment, since the surface linear velocity of the exhaust roller 41 is lower than the laying linear velocity of the fabric a, the exhaust roller 41 has a slight hindering effect on the fabric a. This hindering effect causes a slight excess in the upstream fabric length, which manifests as wrinkles. Therefore, a tension isolator 5 is provided. In this embodiment, an isolator roller 51 under the action of a cylinder is selected as the tension isolator 5. When the position of the isolator roller 51 deflects, the fabric roll path length is changed, thereby absorbing the excess fabric length. When the downstream returns to normal, the rocker arm 52 returns to its normal position under the restoring force of the second cylinder 53.

[0029] As a preferred embodiment, it further includes a pre-exhaust member 6 disposed upstream of the exhaust roller 41 and applying pressure to the contact front end between the fabric layers a; the pre-exhaust member 6 includes a third cylinder 61 vertically mounted on the frame 1, a pre-exhaust roller bearing seat 62 disposed at the piston rod end of the third cylinder 61, and a pre-exhaust roller 63 whose end is connected to the pre-exhaust roller bearing seat 62 via a bearing.

[0030] In this embodiment, the third cylinder 61 is installed vertically. When the piston rod retracts downward, the pre-exhaust roller 63 presses downward against the fabric a to initially exhaust the air trapped between layers. The pre-exhaust roller 63 is a small-diameter roller located above the fabric upstream of the exhaust roller 41. It rotates due to friction from the fabric a and does not require a drive. Its downward pressure is lower than that of the exhaust roller 41.

[0031] As a preferred embodiment, it also includes a guide member disposed on the table surface 3 and located at the side end of the fabric a.

[0032] In this embodiment, the air guide can be an air guide plate set on both sides of the table 3. The air guide plate is inclined outward. After the backflowing airflow encounters the air guide plate, it is guided to the outside of the fabric. There is an open gap between the air guide plate and the fabric edge, so that the air at the edge can escape naturally from the gap. The air guide can also be a low negative pressure air intake port, set on both sides of the fabric edge. The flow rate is small, and it can only draw air without sucking up the fabric.

[0033] As a preferred embodiment, the air guide pattern 412 is a spiral pattern and is symmetrically arranged with the axial centerline of the exhaust roller body 411 as the axis. The circular arc transition at the intersection makes the air guide pattern 412 continuously arranged. The exhaust roller body 411 is divided into a left roller section, a middle roller section and a right roller section along the axial direction. The spiral helix angle of the air guide pattern 412 on the surface of the middle roller section is greater than the spiral helix angle of the air guide pattern 412 on the surfaces of the left roller section and the right roller section.

[0034] In this embodiment, the air-guiding pattern 412 is symmetrically arranged on the left and right halves of the fabric with the axial centerline of the exhaust roller 411 as the axis. The two spiral sections on the left and right sides are offset by half a pitch in the center, forming a continuous transition channel. After the air moves from the left spiral towards the center, it will not stop on the line of symmetry, but will be guided by the transition channel to the starting area of ​​the right spiral, and then discharged to the right, and vice versa. Therefore, there is no air-guiding breakpoint in the center of the fabric, and the fabric in the central area is lightly touched by the pattern alternately, without a continuous pressure indentation line. Preferably, the spiral rise angle of the air-guiding pattern 412 is between 25 degrees and 35 degrees. If the rise angle is too small, the air-guiding direction is close to the circumferential direction, and the air will be carried around by the roller surface instead of going to the sides; if the rise angle is too large, the air-guiding direction is close to the axial straight groove, and the relative sliding pushing component of the air is insufficient. Therefore, 15 degrees to 45 degrees is an effective range, and 25 degrees to 35 degrees is a preferred range. The top of the convex pattern of the air guide pattern 412 is also superimposed with a fine shallow groove. When the convex pattern is pressed against the fabric surface, the top surface of the convex pattern is in contact with the fabric surface, and the main groove may be temporarily closed. At this time, the shallow groove still retains the air leakage channel, and the air will not be blocked by the pattern itself. The main pattern guides the air to flow to both sides, and the shallow groove forms a continuous exhaust channel. The two-stage channels work together to avoid interruption in the exhaust process.

[0035] Furthermore, when the fabric width is large, the required air guiding strength is different because the air discharge path from the middle of the fabric width to the two sides of the edge is different from the air discharge path from the two sides of the fabric width to the edge. The exhaust roller 411 is segmented along the axial direction, and the spiral angle of different segments is different. The spiral angle of the air guiding pattern 412 on the surface of the middle roller segment is greater than that of the air guiding pattern 412 on the surface of the left roller segment and the right roller segment.

[0036] As a preferred embodiment, the system further includes a control system, which includes a main controller and a detection unit.

[0037] In this embodiment, the main controller is the control center of the fabric laying mechanism. The main controller is electrically connected to the servo system, motor, first cylinder 421, second cylinder 53, and third cylinder 61 of the feeding device 2. The detection unit is used to detect the state of the laid fabric surface. It can be a line laser sensor, installed downstream of the fabric drop point, spanning the entire fabric width, and scanning the height profile of the laid fabric surface in real time. The main controller calculates the height standard deviation by segmenting the profile data. When the standard deviation exceeds a predetermined value, the main controller determines that there is a bulging trend in that segment. The control logic of the main controller is divided into two levels: the first level is that when a bulging trend occurs, the main controller increases the slip ratio; the second level is that if the bulging does not subside after three consecutive scanning cycles, the main controller prompts to reconfirm the fabric parameters and readjust them, and vice versa. All adjustments are small and reversible, effectively avoiding over-adjustment that may cause new instability.

[0038] The main controller collects the fabric feeding speed of the feeding device 2, calculates the laying linear speed of fabric a, and then calculates the target surface linear speed of the exhaust roller 41 according to the slip difference rate set for the fabric, thereby obtaining the target speed of the motor.

[0039] The specific working process of this application is as follows: Before the fabric laying begins, the operator makes an initial selection based on the specifications of the current fabric a. The main controller sets parameters such as the fabric feeding speed, slip difference rate, loading pressure of the first cylinder 421, loading pressure of the third cylinder 61, and return lifting roller. During the forward fabric laying stroke, fabric a is continuously fed out by the feeding device 2, passes around the isolation roller 51 of the tension isolation component 5, passes through the pre-exhaust component 6, and reaches below the exhaust roller 41. The piston rod of the first cylinder 421 extends, the outer hollow synchronous shaft 422 rotates, the swing arm 426 swings down, and the exhaust roller 41 lightly presses the fabric a with the set pressure. The motor operates according to the set... The slip differential speed drives the exhaust roller 41, which slides relative to the fabric a at a surface linear velocity lower than the laying linear velocity. Air is discharged from the open gap between the selvage and the guide. When the fabric laying reaches the end of the stroke, the return stroke begins. The main controller receives the return stroke signal and controls the piston rod of the first cylinder 421 to retract, the outer hollow synchronous shaft 422 to rotate in the opposite direction, the swing arm 426 to swing up, and the exhaust roller 41 to lift off the fabric surface. At the same time, the motor stops or rotates at a very low speed. When entering the next forward laying stroke, the first cylinder 421 is reloaded, the exhaust roller 41 falls, the motor resumes the target speed, and the exhaust roller 41 resumes its working state.

[0040] A method for laying an airtight fabric, using the aforementioned airtight fabric laying mechanism, includes the following steps: S1, setting the fabric feeding speed, the slip differential rate of the exhaust roller, the position of the exhaust roller relative to the fabric, and the return lifting roller parameters according to the current fabric specifications; S2, during the forward laying stroke, the feeding device continuously feeds the fabric, and the fabric reaches the exhaust device after passing through the tension isolator; the exhaust roller makes light contact with the fabric at a surface linear velocity lower than the laying linear velocity, forming controlled relative sliding, and the air guide pattern discharges the air trapped between layers to both sides of the fabric width; S3, during the return stroke, the exhaust roller is lifted away from the fabric surface; S4, when entering the next forward laying stroke, the exhaust roller is reloaded and returns to the working state of step S2.

[0041] As a preferred embodiment, in step S2, the fabric passes through a pre-exhaust member before entering the exhaust device, and the continuous air layer is pre-squeezed out; in step S2, the height profile of the laid fabric is detected in real time, and when a bulging trend or fabric accumulation trend is detected, the slip ratio and / or the position of the exhaust roller relative to the fabric are adjusted.

[0042] The aforementioned controller, servo system, and line laser sensor are all well-known general knowledge in the technical field of this application.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A fabric laying mechanism for airtight fabrics, comprising a frame, a feeding device, a table, and an exhaust device disposed above the table, characterized in that, The exhaust device includes an exhaust roller and a floating support member disposed on the frame for supporting the exhaust roller and applying pressure to the fabric; The exhaust roller includes an exhaust roller body disposed above the fabric and air guiding patterns disposed on the surface of the exhaust roller body and extending from the middle of the fabric to both sides of the fabric. The floating support includes a first cylinder hinged at its tail end to the frame, an outer hollow synchronous shaft parallel to the exhaust roller, an inner drive shaft mounted within the outer hollow synchronous shaft via a bearing, an exhaust roller bearing and an exhaust roller bearing seat mounted on the exhaust roller, a swing arm fixed at one end on the outer hollow synchronous shaft and the other end fixed on the exhaust roller bearing seat, a drive wheel mounted on the end of the inner drive shaft exposed on the outer hollow synchronous shaft, a driven wheel mounted on the end of the exhaust roller and connected to the drive wheel via a synchronous belt drive, and a motor for driving the drive wheel. The outer hollow synchronous shaft and the piston rod end of the first cylinder are hinged via a bearing. The extension and retraction of the first cylinder causes the outer hollow synchronous shaft to rotate, thereby causing the exhaust roller to move closer to / away from the fabric. The motor controls the surface linear velocity of the exhaust roller to be less than the laying linear velocity of the fabric, so that the exhaust roller and the fabric form relative sliding.

2. The fabric laying mechanism for airtight fabrics according to claim 1, characterized in that, It also includes a tension isolation element disposed between the feeding device and the exhaust device to absorb the fabric length difference caused by the exhaust roller.

3. The fabric laying mechanism for airtight fabrics according to claim 1, characterized in that, It also includes a pre-venting component disposed upstream of the venting roller and applying pressure to the front end of the interlayer contact of the fabric.

4. The fabric laying mechanism for airtight fabrics according to claim 2, characterized in that, The tension isolation component includes an isolation roller arranged parallel to the exhaust roller, a rocker arm with one end hinged to the frame and the other end connected to the end of the isolation roller via a bearing, and a second cylinder with its tail end hinged to the frame and the piston rod end hinged to the rocker arm.

5. The fabric laying mechanism for airtight fabrics according to claim 3, characterized in that, The pre-discharge component includes a third cylinder vertically mounted on the frame, a pre-discharge roller bearing seat located at the piston rod end of the third cylinder, and a pre-discharge roller whose end is connected to the pre-discharge roller bearing seat via a bearing.

6. The fabric laying mechanism for airtight fabrics according to claim 1, characterized in that, It also includes a flow guide disposed on the table surface and located at the side end of the fabric.

7. The fabric laying mechanism for airtight fabrics according to claim 1, characterized in that, The air guide pattern is a spiral pattern, and it is symmetrical about the axial centerline of the exhaust roller. The circular arc transition at the intersection makes the air guide pattern continuous.

8. The fabric laying mechanism for airtight fabrics according to claim 1, characterized in that, The exhaust roller body is divided into a left roller section, a middle roller section and a right roller section along the axial direction. The helix angle of the air guide pattern on the surface of the middle roller section is greater than the helix angle of the air guide pattern on the surfaces of the left roller section and the right roller section.

9. A fabric laying mechanism for airtight fabrics according to any one of claims 1 to 8, characterized in that, It also includes a control system, which comprises a main controller and a detection unit.

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