Sewing Equipment and Sewing Method for Expanded Boards

Abstract

The present application provides a sewing device and a sewing method for an expanded board. The sewing device includes: a frame, the frame having outer columns and inner columns, wherein the outer columns include two separate front columns and two adjacent rear columns, the inner columns include two adjacent central columns, a conveying device, the conveying device being sleeved on the corresponding outer columns and inner columns of the frame and running in a cycle to circulate the expanded board from the front columns to the rear columns, wherein the conveying device includes: a first conveyor belt, a second conveyor belt and a plurality of clamping parts, and a sewing device, the sewing device being installed on the central columns of the frame, the sewing device being used for sewing a first expanded board and a second expanded board.

Description

Technical Field

[0001] The present invention relates to a sewing device for expanded plates, and particularly to a sewing device for large-sized expanded polytetrafluoroethylene plates. The present invention belongs to the field of manufacturing processes of expanded polytetrafluoroethylene sealing materials. The present invention also relates to a method for sewing expanded plates. Background Art

[0002] During the aircraft manufacturing process, expanded plate products are widely used for sealing and anti-corrosion, especially for sealing and anti-corrosion at parts that need to be frequently disassembled and maintained, such as fuselage wing panels, wing-body fairings, cargo and passenger cabin floors, and maintenance access covers. This can shorten the manufacturing and maintenance time and effectively reduce the comprehensive cost of the entire life cycle of civil aircraft, making it a key material for civil aircraft.

[0003] Expanded polytetrafluoroethylene material (EPTFE) can provide reliable surface protection, effective sealing, and gap filling for civil aircraft. Its density is about 0.4 g / cm 3 ~0.8 g / cm 3 , less than half of traditional sealants. At the same time, compared with traditional sealing materials (rubber and sealants), this material has a flexible structure, can fit complex shapes and irregular surfaces, and has the advantages of no need for curing, easy installation, easy disassembly, and reusable, and is widely used in various types of aircraft models.

[0004] Expanded polytetrafluoroethylene plates usually consist of two parts: an expanded polytetrafluoroethylene material body and an adhesive backing. The material body can achieve the function of waterproof sealing under a certain pressure, and the role of the adhesive backing is to enable the material body to be pasted on the parts that need to be sealed.

[0005] Limited by the research and development and preparation levels of domestic large-sized expanded polytetrafluoroethylene plates, the current maximum production size of such expanded plates is 1500×3000 mm. Coating single expanded plates in sequence greatly reduces work efficiency. In addition, due to the coating device, it is difficult to uniformly coat the front and rear ends in the length direction of the expanded plate in the coating process, for example, each 500 mm in length, to meet the requirements, so the expanded plate will be wasted in the length direction. In addition, limited by the production length of the expanded plate, it is currently difficult to achieve efficient and continuous coating of the adhesive backing.

[0006] Currently, the common splicing methods on the market are tape connection and hot welding. Among them, the tape used in tape connection contains adhesives. When subsequent medium resistance treatment is carried out on the expanded plate, the adhesives will be partially dissolved in the treatment liquid, affecting the expanded plate's ability to obtain complete medium resistance performance.

[0007] Furthermore, high-temperature welding generally heats the objects to be welded above the melting point. For expanded polytetrafluoroethylene materials, when the heating temperature is higher than 400 °C, the decomposition rate gradually increases, and there is a very small amount of highly toxic perfluoroisobutene in the decomposition products. Therefore, there is a risk of poisoning in high-temperature welding. On the other hand, expanded polytetrafluoroethylene needs to be sintered at a certain temperature and for a certain time to stabilize its structure to ensure performance. When the already sintered expanded polytetrafluoroethylene is exposed to high temperature again, the internal structure will change partially, affecting the performance of the material itself.

[0008] Therefore, there is still a need to further improve the existing equipment and methods for splicing expanded plates. Summary of the Invention

[0009] Aiming at the above problems of the prior art, the purpose of the present invention is to provide a sewing device and method to splice expanded plates together in the length direction, solve the problems of low working efficiency and large loss in the coating work of single expanded plates in sequence, and thus achieve efficient and continuous coating of the back glue.

[0010] To solve the above problems, the present invention provides a sewing device for expanded plates. The sewing device includes: a frame, the frame has external columns and internal columns, where the external columns include two separate front columns and two adjacent rear columns, the internal columns include two adjacent central columns, a conveying device, the conveying device is sleeved on the corresponding external columns and internal columns of the frame and runs in a cycle, circulating the expanded plates from the front columns to the rear columns, where the conveying device includes: a first conveyor belt and a second conveyor belt, the first conveyor belt and the second conveyor belt are arranged in a Y shape as a whole, where the first conveyor belt and the second conveyor belt are respectively sleeved on a corresponding front column, a central column and a rear column and run in a cycle, and a plurality of clamping parts, one end of the plurality of clamping parts is fixed on the first conveyor belt and the second conveyor belt, and the other ends of the plurality of clamping parts correspondingly and suspendingly clamp the first expanded plate and the second expanded plate in the expanded plates, and a sewing device, the sewing device is installed on the central columns of the frame, and the sewing device is used to sew the first expanded plate and the second expanded plate.

[0011] In the second example of the sewing device, optionally including the first example, the top of the frame includes a triangular frame, and the three corners of the triangular frame are correspondingly located at the tops of the external columns of the frame, and there is a cross beam in the center of the triangular frame, and the internal columns of the frame extend downward from the cross beam for a certain distance.

[0012] In the third example of the sewing device, optionally including one or more or each of the first example and the second example, a plurality of clamping parts are controlled to close by pneumatic switches.

[0013] In the fourth example of the sewing equipment, optionally including one or more or each of the first to third examples, the sewing device adopts a four-needle and six-thread sewing process, and the opening angle of the bifurcated part of the Y-shaped arrangement is 50°-70°; the sewing device uses a sewing needle with a diameter of 0.5mm-0.8mm and a corresponding sewing thread with a diameter of 0.15mm-0.3mm; and the sewing thread of the sewing device uses a nylon rope that can withstand a strength of 40 MPa.

[0014] In the fifth example of the sewing equipment, optionally including one or more or each of the first to fourth examples, the sewing device is fixed on the sewing device height adjustment part by a precision screw. The sewing device height adjustment part is connected to the central column of the frame. A synchronous motor is installed inside the sewing device height adjustment part, and the height of the sewing device is controlled by controlling the precision screw through the control system.

[0015] In the sixth example of the sewing equipment, optionally including one or more or each of the first to fifth examples, the sewing equipment includes multiple photoelectric sensors. The multiple photoelectric sensors transmit position signals to the control system of the sewing equipment. The control system controls the sewing device height adjustment part through the received position signals to control the sewing device to reach the required height.

[0016] In the seventh example of the sewing equipment, optionally including one or more or each of the first to sixth examples, the control system controls the on / off operation of the sewing device through the received position signals. The control system controls the running speeds of the first conveyor belt and the second conveyor belt through the received speed signals to ensure that the running speeds of the first conveyor belt and the second conveyor belt match the sewing speed of the sewing device.

[0017] In the eighth example of the sewing equipment, optionally including one or more or each of the first to seventh examples, it further includes a cutting device. The cutting device is connected to the rear column and cuts the sewn expanded board. The cutting device is fixed on the cutting device height adjustment part by a precision screw. The cutting device height adjustment part is connected to the rear column of the frame. The control system of the sewing equipment controls the cutting device height adjustment part to control the cutting device to reach the required height. And the control system controls the on / off operation of the cutting device through the received position signals to ensure that the cutting speed of the cutting device matches the sewing speed of the sewing device.

[0018] In the ninth example of the sewing equipment, optionally including one or more or each of the first to eighth examples, it further includes a receiving conveyor belt. The receiving conveyor belt is installed at the bottom of the sewing equipment. After the expanded board is cut by the cutting device, it falls onto the receiving conveyor belt.

[0019] The present invention provides a sewing method for an expanded board. Wherein, the sewing method includes: determining the cutting position and the sewing position required for the expanded board to be sewn; inputting the height values of the cutting device and the sewing device corresponding to the cutting position and the sewing position into the control system; clamping the expanded board by the clamping part of the conveying device and conveying it through the conveyor belt of the conveying device; the control system raises the cutting device to the height value of the cutting device to cut the expanded board; and the control system raises the sewing device to the height value of the sewing device to sew the sewn expanded board.

[0020] The present application provides a sewing device and a sewing method, which use the clamping parts on two conveyor belts to clamp the expanded board and convey the expanded board through the conveyor belts arranged in a Y shape. When the device is running, the expanded board to be sewn is clamped along the edge to be sewn and runs from the two bifurcated parts of the Y-shaped arrangement to the intersection point. When the expanded board passes through the sewing device and the cutting device in sequence, the sewn expanded board is cut above the sewn edge and falls on the receiving conveyor belt below the entire device to collect the sewn expanded board. At the same time, a new expanded board to be sewn is re-clamped at the front end of the conveyor belts arranged in a Y shape for a new round of sewing.

[0021] This Y-shaped arrangement, on the one hand, enables two expanded boards to be sewn to be sent to the front of the sewing device at a certain initial angle via the conveyor belts. After the sewn expanded board is cut, it falls off onto the bottom receiving conveyor belt. At the same time, the front end of the conveyor belt clamps again for a new round of sewing, ensuring the continuity and rapidity of the entire operation process. On the other hand, transportation is carried out by conveyor belts, and the conveyor belt speed can be adjusted controllably, so that the expanded board to be sewn does not undergo relative displacement. This method ensures the consistency and accuracy during the sewing process. Description of the Drawings

[0022] To describe the embodiments for obtaining the above and other features of the present invention, a more specific description of the present invention briefly described above will be presented with reference to the exemplary embodiments of the present invention shown in the drawings. It can be understood that these drawings only depict the exemplary embodiments of the present invention and should not be considered as limiting its scope. The present invention will be described and explained by using the drawings and additional features and details. In the drawings:

[0023] Figure 1 is a perspective view of a sewing device according to a preferred embodiment of the present invention; and

[0024] Figure 2 is a side view of the sewing device and the height adjustment part of the sewing device.

[0025] Figure 1 Figure 2Drawings are generally to scale, however, the dimensions in the drawings are only illustrative and need not be drawn to scale, but are intended to be more clearly illustrated. In other embodiments, other relative dimensions may be used.

[0026] Herein and throughout the following, the same features appearing in different drawings are denoted by the same or similar reference numerals.

[0027] List of reference numerals:

[0028] 10 Frame

[0029] 11 Front column

[0030] 12 Rear column

[0031] 13 Central column

[0032] 20 Conveying device

[0033] 21 First conveyor belt

[0034] 22 Second conveyor belt

[0035] 30 Sewing device

[0036] 31 Sewing device height adjustment part

[0037] 40 Cutting device

[0038] 41 Cutting device height adjustment part

[0039] 50 Material receiving conveyor belt Detailed description of the embodiments

[0040] The present invention will be further described below in conjunction with specific embodiments and the drawings. More details are set forth in the following description in order to fully understand the present invention. However, the present invention is clearly capable of being implemented in many other ways different from this description. Those skilled in the art can make similar generalizations and deductions according to the actual application situation without departing from the connotation of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0041] In each embodiment of the present invention, "front" is defined as Figure 1 the lower right direction of Figure 1 and "upward, top direction" is defined as

[0042] Figure 1 Schematically shown is a sewing device according to a preferred embodiment of the present invention, which mainly includes a frame 10 providing an overall structure and mounting positions, a conveying device 20 for conveying the expanded board to be sewn, and a sewing device 30 for sewing the expanded board.

[0043] The frame 10 may have multiple external columns and multiple internal columns. As Figure 1 shown, the external columns of the preferred embodiment of the present invention include two separate front columns 11 and two adjacent rear columns 12, and the internal columns include two adjacent central columns 13. Preferably, the external columns include at least four columns in the vertical direction.

[0044] Preferably, the front columns 11 and the rear columns 12 may be made of 40mm square tubes with a length greater than 3000mm, and the central columns 13 may be made of 40mm square tubes with a length of approximately 850mm. These columns together form the frame 10 of the sewing device. It can be understood that the dimensions and shapes of these columns are not limited to this, but other columnar members with different dimensions and shapes can be selected according to needs.

[0045] In the preferred embodiment, the conveying device 20 can be sleeved on the corresponding external columns and internal columns of the frame 10 and run in a cycle to circulate the expanded board from the front column 11 to the rear column 12.

[0046] In the preferred embodiment, the top of the frame 10 includes a triangular frame to ensure the stability of the entire sewing device. The three corners of the triangular frame are correspondingly located at the tops of the external columns of the frame 10, and there is a cross beam in the center of the triangular frame. Two shorter internal columns of the frame 10 extend downward from the cross beam for a certain distance.

[0047] In the preferred embodiment, the conveying device 20 may include two left and right conveyor belts, namely the first conveyor belt 21 and the second conveyor belt 22. The first conveyor belt 21 and the second conveyor belt 22 form a Y-shaped arrangement as a whole, and move from the bifurcated end of the Y-shaped arrangement towards the one-word end during operation. Among them, the first conveyor belt 21 and the second conveyor belt 22 are respectively sleeved on a front column 11, a central column 13, and a rear column 12 on the corresponding side and run in a cycle. The conveyor belts wrap around the columns as a whole and move in a cycle from the inside to the outside.

[0048] Preferably, the two front columns 11 of the sewing device are dispersed at the two bifurcated ends of the Y shape, and the two rear columns 12 are close to each other, and the distance can be 10mm - 20mm.

[0049] Preferably, the conveying device 20 may further include multiple clamping parts. One end of these clamping parts is fixed on the first conveyor belt 21 and the second conveyor belt 22, and the other end correspondingly hangs to clamp the first expanded board and the second expanded board in the expanded board to be sewn. Preferably, when clamping a new group of expanded boards to be sewn, the new group of boards are correspondingly clamped according to the intervals of the clamping parts to allow the group of boards to be aligned and synchronized for sewing. Preferably, the clamping parts are controlled to close by pneumatic switches. Preferably, the clamping parts are made of stainless steel. Preferably, a single clamping part can bear a weight of at least 50 kg at most.

[0050] In a preferred embodiment, as Figure 2 shown, the sewing device 30 is mounted on the central column 13 of the frame 10 for sewing the first expanded board and the second expanded board. Among them, the position of the sewing device 30 is kept fixed, and when a new group of expanded boards travels past the sewing device 30 along the conveying direction of the conveyor belt, sewing is performed at the sewing position of the expanded boards at a predetermined distance below a plurality of holding parts to sew the short sides (i.e., widths) of the two expanded boards together.

[0051] Preferably, the sewing device 30 adopts a four-needle and six-thread sewing process, and in order to adapt to the four-needle and six-thread sewing process, the opening angle of the Y-shaped arrangement is preferably 50° - 70°, and more preferably 60°.

[0052] Preferably, the sewing device 30 joins the expanded boards through sewing threads. Preferably, the diameter of the sewing thread is 0.15 mm - 0.3 mm. If the sewing thread is too thin, it will affect the firmness of sewing the expanded board, while if the sewing thread is too thick, it will affect the sealing performance of the expanded board. Using a diameter of 0.15 mm - 0.3 mm can not only ensure the strength of the splicing part but also reduce the impact on the flatness of the expanded board to ensure the coating accuracy of the back glue.

[0053] Preferably, the temperature resistance of the sewing thread is defined to be not less than 600°, so as to ensure that when the back glue is dried in an oven later, the sewing thread can maintain stable performance without being damaged or deteriorated, and the performance of the connection part of the expanded board remains stable.

[0054] Preferably, the sewing thread of the sewing device 30 adopts a nylon rope that can withstand a strength of 40 MPa.

[0055] Preferably, the sewing needle of the sewing device 30 adopts a needle with a diameter of 0.5 mm - 0.8 mm and corresponds to the diameter of the sewing thread. Using a needle with a diameter less than 0.8 mm ensures that the perforation during the sewing process will not have too much impact on the sealing performance and structural integrity of the expanded board, resulting in non-compliance with the usage requirements.

[0056] In a preferred embodiment, as Figure 2 shown, the sewing device 30 can be fixed on the sewing device height adjustment part 31 through a precision screw. The sewing device height adjustment part 31 can be connected to one of the central columns 13 of the frame 10.

[0057] Preferably, a synchronous motor is installed inside the sewing device height adjustment part 31, and the height of the sewing device 30 is controlled by controlling the precision screw through a control system, and the minimum precision can reach 0.2 mm. Preferably, the synchronous motor can also preset the height of the sewing device through the control system. After the start signal is input, the sewing device height adjustment part quickly adjusts the height value to the set value, and the response speed reaches 0.1 ms.

[0058] In a preferred embodiment, further, in order to ensure the automation, continuity, and precision of the sewing process, the sewing device may include a plurality of photoelectric sensors that transmit position signals to the control system of the sewing device. The control system controls the height adjustment part 31 of the sewing device through the received position signals to control the sewing device 30 to reach the required height.

[0059] Preferably, these photoelectric sensors can be installed 20 mm in front of the height adjustment part 31 of the sewing device, more preferably 10 mm in front, and can monitor the running position and running speed of the expanded board to be sewn through the photoelectric effect.

[0060] Preferably, the control system controls the on / off operation of the sewing device 30 through the received position signals, and controls the running speeds of the first conveyor belt 21 and the second conveyor belt 22 through the received speed signals to ensure that the running speeds of the first conveyor belt 21 and the second conveyor belt 22 match the sewing speed of the sewing device 30.

[0061] In a preferred embodiment, a cutting device 40 may also be included. The cutting device 40 is connected to the rear column 12 and is used to cut the sewn expanded board.

[0062] Preferably, the cutting device 40 is fixed on the cutting device height adjustment part 41 through a precision screw, and the cutting device height adjustment part 41 is connected to the rear column 12 of the frame 10.

[0063] Preferably, the control system of the sewing device controls the cutting device height adjustment part 41 to control the cutting device 40 to reach the required height, and this height is slightly higher than the sewing position of the sewing device and lower than the clamping position of the plurality of clamping parts.

[0064] Preferably, the control system controls the on / off operation of the cutting device 40 through the received position signals to ensure that the cutting speed of the cutting device 40 matches the sewing speed of the sewing device 30 and the conveyor belt conveying speed.

[0065] In a preferred embodiment, a receiving conveyor belt 50 may also be included at the bottom of the sewing device. The sewn expanded board is cut at the top of the expanded board, specifically above the sewing position, by the cutting device 40, disengages from the clamping part, and falls on the receiving conveyor belt 50.

[0066] Preferably, the receiving conveyor belt 50 sends out the sewn expanded board from the front of the sewing device. It can be understood that the installation direction of the receiving conveyor belt 50 is not limited to this, and it can also be in Figure 1 the direction from the lower left to the upper right to send out the expanded board.

[0067] Furthermore, when the puffed sheet that has been sewn is cut off, it falls onto the material receiving conveyor belt 50 below the entire device, and the excess puffed sheet left on the clamping part is collected.

[0068] Preferably, while the above process is being carried out, at the front end of the Y-shaped conveyor belt, i.e. the forked end, the clamping part is used to clamp the new puffed board to be sewn again, and a new round of sewing is carried out. The sewn puffed board is cut and placed on the material receiving conveyor belt 50 for transportation to the next process.

[0069] Preferably, a winder can be arranged in the conveying direction of the receiving conveyor belt 50 so as to collect, store and transport the sewn puffed sheets in a roll.

[0070] The application also provides a sewing method.

[0071] Before actual use, first determine the required cutting position and sewing position of the puffed board to be sewn. The sewing position is generally controlled 10mm below the protruding part of the two puffed boards. The cutting position is generally 1mm-3mm higher than the sewing position. Enter the height values of the cutting device and sewing device corresponding to the cutting position and sewing position in the control system.

[0072] When the device starts running, the clamping part of the conveyor device is first used to clamp the puffed board, and the conveyor belt of the conveyor device runs from the bifurcated end of the Y-shaped arrangement to the straight end. When the front end of the puffed board runs to 10mm from the front end of the sewing height adjustment part, the puffed board blocks the photoelectric sensor, and the photoelectric sensor inputs a signal to the control system. The control system immediately activates the operation of the synchronous motor to raise the cutting device and sewing device to the set height value. The response speed of the entire system can reach 0.1ms, which ensures the express and accurate sewing and cutting processes.

[0073] Furthermore, after the front end of the puffed plate passes through the photoelectric sensor, the photoelectric sensor is constantly shining on the puffed plate, and the running speed of the puffed plate can be monitored. This speed is also the running speed of the conveyor belt, and this speed is then fed back to the control system. After receiving the signal, the control system determines whether the running speed of the conveyor belt matches the running speed of the sewing device. If they do not match, the speed of the conveyor belt can be controlled to match the sewing speed of the sewing device, thereby ensuring the consistency of the sewing process and preventing problems such as inconsistent stitch distances that affect sewing strength due to speed mismatch.

[0074] Furthermore, signals are received by a photoelectric sensor to control the activation of two height adjustment units, enabling the sewing device and the cutting device to quickly enter the working state. At the same time, the speed of the conveyor belt can also be monitored by the photoelectric sensor to match its speed with that of the sewing device. This automated control method ensures the precision and accuracy of the entire sewing and cutting process, greatly improving the production efficiency of the sewn expanded board and the connection strength of the expanded board after sewing.

[0075] Common connection methods on the market currently include tape connection and high-temperature welding. Compared with tape connection and high-temperature welding, the obvious advantage of sewing connection is that it does not change the properties of the material itself and does not affect subsequent processing procedures. Further, sewing connection itself is a mechanical connection, not involving the addition of chemical substances and changes in conditions such as temperature, and has no impact on the properties and strength of the material itself.

[0076] The sewing needle used in this sewing device has a diameter of 0.6 mm. During the sewing process, the holes formed on the expanded board are small and do not damage the mechanical properties of the expanded board. The sewing thread is a high-strength nylon rope with a diameter of 0.16 mm, and the maximum tensile strength can reach 40 MPa, ensuring the firmness of the subsequent processing process. The stitch spacing during the sewing process is 5 mm, and the overall connection is relatively dense, greatly improving the firmness and strength of the sewing process. During the sewing process, signals are received by a photoelectric sensor to control the activation of the height adjustment unit, enabling the sewing device and the cutting device to quickly enter the working state. At the same time, the speed of the conveyor belt can also be monitored by the photoelectric sensor to match its speed with that of the sewing device. This automated control method ensures the precision and accuracy of the entire sewing and cutting process, greatly improving the production efficiency of the sewn expanded board and the connection strength of the expanded board after sewing. Coupled with its short time consumption, simple operation, high connection strength, and no generation of waste water, waste gas, and waste residue during the production process, it is more suitable for continuous and stable production. For the connection of expanded polytetrafluoroethylene plates, it is a reliable and stable connection method.

[0077] Although various embodiments have been described above, it should be understood that they are presented by way of example rather than limitation. It will be apparent to those skilled in the relevant art that the disclosed subject matter can be implemented in other specific forms without departing from its spirit and essential characteristics.

[0078] This disclosure also includes various modifications and variations within the equivalent scope. In addition, various combinations, methods, further including combinations and methods with only one element, more than one or less than one other element also fall within the scope and thinking range of this disclosure.

[0079] Therefore, the embodiments described above are considered to be exemplary in all aspects rather than restrictive, and do not serve as a basis for any limitation to the present invention.

Claims

1. A sewing device for an expanded board, characterized in that, The sewing device includes: A frame (10), the frame (10) having outer columns and inner columns, wherein the outer columns include two separate front columns (11) and two adjacent rear columns (12), and the inner columns include two adjacent central columns (13). A conveying device (20), the conveying device (20) being sleeved on the corresponding outer columns and inner columns of the frame (10) and running in a loop to circulate the expanded board from the front column (11) to the rear column (12), wherein the conveying device (20) includes: A first conveyor belt (21) and a second conveyor belt (22), the first conveyor belt (21) and the second conveyor belt (22) forming a Y-shaped arrangement as a whole, wherein the first conveyor belt (21) and the second conveyor belt (22) are respectively sleeved on a corresponding front column (11), a central column (13), and a rear column (12) and run in a loop, and A plurality of clamping parts, one ends of the plurality of clamping parts being fixed on the first conveyor belt (21) and the second conveyor belt (22), and the other ends of the plurality of clamping parts correspondingly and vertically clamping a first expanded board and a second expanded board in the expanded board, and A sewing device (30), the sewing device (30) being installed on the central column (13) of the frame (10), and the sewing device (30) being used for sewing the first expanded board and the second expanded board.

2. The sewing device according to claim 1, wherein The top of the frame (10) includes a triangular frame, and the three corners of the triangular frame are correspondingly located at the tops of the outer columns of the frame (10), and There is a cross beam in the center of the triangular frame, and the inner columns of the frame (10) extend downward from the cross beam by a certain distance.

3. The sewing device according to claim 1, wherein The plurality of clamping parts are controlled to close by pneumatic switches.

4. The sewing device according to claim 1, wherein The sewing device (30) adopts a four-needle six-thread sewing process, and the opening angle of the bifurcated part of the Y-shaped arrangement is 50°-70°; The sewing device (30) adopts a sewing needle with a diameter of 0.5mm-0.8mm and a corresponding sewing thread with a diameter of 0.15mm-0.3mm; and The sewing thread of the sewing device (30) adopts a nylon rope capable of withstanding a strength of 40 MPa.

5. The sewing device according to claim 1, wherein The sewing device (30) is fixed on a sewing device height adjustment part (31) through a precision screw, and the sewing device height adjustment part (31) is connected to the central column (13) of the frame (10). A synchronous motor is installed inside the sewing device height adjustment part (31), and the precision screw is controlled through a control system to further control the height of the sewing device (30).

6. The sewing device according to claim 5, wherein The sewing device includes a plurality of photoelectric sensors, and the plurality of photoelectric sensors transmit position signals to the control system of the sewing device. The control system controls the height adjustment part (31) of the sewing device through the received position signals to control the sewing device (30) to reach the required height.

7. The sewing device according to claim 6, wherein the control system controls the on / off operation of the sewing device (30) through the received position signals, and the control system controls the running speeds of the first conveyor belt (21) and the second conveyor belt (22) through the received speed signals to ensure that the running speeds of the first conveyor belt (21) and the second conveyor belt (22) match the sewing speed of the sewing device (30).

8. The sewing device according to claim 1, wherein it further includes a cutting device (40), and the cutting device (40) is connected to the rear column (12) to cut the sewn expanded board, and the cutting device (40) is fixed on the cutting device height adjustment part (41) through a precision screw, and the cutting device height adjustment part (41) is connected to the rear column (12) of the frame (10), and the control system of the sewing device controls the cutting device height adjustment part (41) to control the cutting device (40) to reach the required height, and the control system controls the on / off operation of the cutting device (40) through the received position signals to ensure that the cutting speed of the cutting device (40) matches the sewing speed of the sewing device (30).

9. The sewing device according to claim 8, wherein it further includes a material receiving conveyor belt (50), and the material receiving conveyor belt (50) is installed at the bottom of the sewing device. After the expanded board is cut by the cutting device (40), it falls onto the material receiving conveyor belt (50).

10. A sewing method for an expanded board, using the sewing device according to any one of claims 8-9, characterized in that, The sewing method includes: determining the cutting position and sewing position required for the expanded board to be sewn; inputting the height values of the cutting device and the sewing device corresponding to the cutting position and the sewing position into the control system; clamping the expanded board by the clamping part of the conveying device and conveying it through the conveyor belt of the conveying device; the control system raises the cutting device to the height value of the cutting device to cut the expanded board; and the control system raises the sewing device to the height value of the sewing device to sew the sewn expanded board.

Images