Method and apparatus for adjusting the uniformity of a crosslapper

Abstract

This application provides a method for adjusting the uniformity of web laying in a cross-laying machine. The method includes: acquiring N displacement points of the reciprocating motion of the web storage trolley and the position of the main shaft when the trolley reaches each displacement point; acquiring the percentage of speed adjustment required at each displacement point; creating a first superimposed cam curve for the web storage trolley and a second superimposed cam curve for the front and rear curtains based on the position of the main shaft and the percentage of speed adjustment required at each displacement point; superimposing the first superimposed cam curve onto the web storage shaft of the web storage trolley, and superimposing the second superimposed cam curve onto the front curtain shaft of the front curtain and the rear curtain shaft of the rear curtain, respectively. This application embodiment can lay webs that meet any uniformity distribution requirements.

Description

Technical Field

[0001] This invention relates to the field of cross-laying machines and their control, and more particularly to a method and apparatus for adjusting the uniformity of web laying in a cross-laying machine. Background Technology

[0002] Cross-laying machines are crucial equipment in nonwoven fabric production lines. Their main function is to achieve multi-layer laying of fiber webs, and their performance often determines the yield and quality of the nonwoven fabric. Figure 1 As shown, a cross-laying machine mainly consists of a net output curtain, a net storage trolley, a net laying trolley, a front curtain and a rear curtain arranged between the net storage trolley and the net laying trolley, and a net output curtain. Existing cross-laying machines typically output a uniformly thin net at the net output curtain, such as... Figure 2 As shown in (a), however, due to the characteristics of the raw materials, subsequent processes (such as multi-roller drawing, needle punching, or hydroentangling) often exert tension on the fiber web output from the screen, causing deformation of the fiber web and resulting in uneven thickness of the final laid fiber web. Figure 2 (b) shows a shape that is thin in the middle and thick on both sides. Summary of the Invention

[0003] In view of this, the present invention provides a method and apparatus for adjusting the uniformity of cross-laying machine, which at least partially solves the above-mentioned technical problems.

[0004] A first aspect of the present invention provides a method for adjusting the uniformity of net laying in a cross-laying machine, the cross-laying machine comprising a net storage trolley, a net laying trolley, and a front curtain and a rear curtain arranged between the net storage trolley and the net laying trolley, characterized in that the method comprises:

[0005] A obtains N displacement points of the reciprocating motion of the storage net trolley and the position of the main shaft when the storage net trolley moves to each displacement point, where N is an integer greater than 4;

[0006] B obtains the percentage of velocity to be adjusted for each of the displacement points;

[0007] C creates a first superimposed cam curve for the storage trolley and a second superimposed cam curve for the front curtain and the rear curtain based on the position of the main shaft when the storage trolley moves to each displacement point and the percentage of speed to be adjusted at each displacement point;

[0008] D superimposes the first superimposed cam curve onto the storage net shaft of the storage net trolley, and superimposes the second superimposed cam curve onto the front curtain shaft of the front curtain and the rear curtain shaft of the rear curtain, respectively.

[0009] In one possible implementation, the N displacement points include M displacement points of the storage trolley moving along a first direction and M displacement points moving along a second direction, and the two sets of M displacement points correspond one-to-one and the displacement values ​​of each other are equal. The reciprocating motion includes the movement along the first direction and the movement along the second direction, and N = 2M.

[0010] In one possible implementation, step C further includes:

[0011] For the M displacement points moving along the first direction and the M displacement points moving along the second direction, the coordinates of each displacement point of the storage trolley are determined based on the position of the main shaft when the storage trolley reaches each displacement point and the percentage of speed adjustment required at each displacement point, where the coordinates of the kth displacement point are... P k The x represents the position of the main shaft when the storage trolley reaches the k-th displacement point. k Y represents the percentage of speed adjustment required at the k-th displacement point, l represents the displacement value between the k-th and (k-1)-th displacement points, and Y represents the displacement value between the k-th and (k-1)-th displacement points. k-1 This represents the ordinate of the (k-1)th displacement point, where Y0 = 0;

[0012] The coordinates of each displacement point of the front curtain and the rear curtain are calculated based on the coordinates of each displacement point of the storage net trolley.

[0013] The cam curve is plotted based on the calculated coordinates of each displacement point of the storage trolley and the coordinates of each displacement point of the front curtain and the rear curtain.

[0014] The first superimposed cam curve is created by performing Bezier linear interpolation between each plotting point of the storage net trolley, and the second superimposed cam curve is created by performing Bezier linear interpolation between each plotting point of the front curtain and the rear curtain.

[0015] In one possible implementation, before step A, the following is also included:

[0016] Obtain the current cam curve of the storage network trolley;

[0017] The maximum and minimum values ​​of the displacement of the storage trolley in any direction are determined based on the current cam curve, and the displacement value of the storage trolley in any direction is calculated based on the difference between the maximum and minimum values.

[0018] Based on the displacement value, the reciprocating motion displacement of the storage trolley is divided into N-1 displacement segments to obtain N corresponding displacement points, and the position of the main shaft when the storage trolley moves to each node is determined.

[0019] In one possible implementation, step B is preceded by:

[0020] E obtains the uniformity distribution of the fiber web currently laid by the cross-laying machine;

[0021] F determines whether the uniformity distribution conforms to the target uniformity distribution;

[0022] If G does not meet the requirements, then compare the uniformity distribution with the target uniformity distribution.

[0023] In one possible implementation, step B further includes:

[0024] Based on the comparison results, determine the percentage of speed to be adjusted for each displacement point, and obtain the percentage of speed to be adjusted for each displacement point.

[0025] In one possible implementation, the uniformity distribution includes the uniformity of the fiber web segment corresponding to each displacement point; and step G further includes: if it does not meet the requirement, comparing the uniformity of each fiber web segment with the target uniformity of the fiber web segment; and step B further includes: determining the percentage of speed to be adjusted for each displacement point based on the comparison result, and obtaining the percentage of speed to be adjusted for each displacement point.

[0026] In one possible implementation, the method further includes:

[0027] The uniformity distribution of the fiber web currently laid by the cross-laying machine is periodically acquired and it is determined whether the uniformity distribution conforms to the target uniformity distribution. If it does not conform, the process of “step G-step B-step C-step D-step E-step F” is repeated until the uniformity distribution of the fiber web currently laid by the cross-laying machine conforms to the target uniformity distribution.

[0028] A second aspect of the present invention provides an apparatus for adjusting the uniformity of web laying in a cross-laying machine, the cross-laying machine comprising a web storage trolley, a web laying trolley, and a front curtain and a rear curtain arranged between the web storage trolley and the web laying trolley, characterized in that the apparatus comprises:

[0029] The first acquisition module is used to acquire N displacement points of the reciprocating motion of the storage net trolley and the position of the main shaft when the storage net trolley moves to each displacement point, where N is an integer greater than 4;

[0030] The second acquisition module is used to acquire the percentage of speed to be adjusted for each displacement point;

[0031] A cam curve creation module is used to create a first superimposed cam curve for the storage trolley and a second superimposed cam curve for the front curtain and the rear curtain based on the position of the main shaft when the storage trolley moves to each displacement point and the percentage of speed to be adjusted at each displacement point;

[0032] The output module is used to superimpose the first superimposed cam curve onto the storage net shaft of the storage net trolley, and to superimpose the second superimposed cam curve onto the front curtain shaft of the front curtain and the rear curtain shaft of the rear curtain, respectively.

[0033] In one possible implementation, the N displacement points include M displacement points of the storage trolley moving along a first direction and M displacement points moving along a second direction, and the two sets of M displacement points correspond one-to-one and the displacement values ​​of each other are equal. The reciprocating motion includes the movement along the first direction and the movement along the second direction, and N = 2M.

[0034] In one possible implementation, the cam curve creation module is further configured to: determine the coordinates of each displacement point of the storage trolley based on the position of the main shaft when the storage trolley moves to each displacement point and the percentage of speed adjustment required for each displacement point, for the M displacement points moving along the first direction and the M displacement points moving along the second direction, respectively, where the coordinates of the kth displacement point are: P k The x represents the position of the main shaft when the storage trolley moves to the k-th displacement point. k Y represents the percentage of speed adjustment required at the k-th displacement point, l represents the displacement value between the k-th and (k-1)-th displacement points, and Y represents the displacement value between the k-th and (k-1)-th displacement points. k-1 Let Y0 represent the ordinate of the (k-1)th displacement point and Y0 = 0; calculate the coordinates of each displacement point of the front curtain and the rear curtain based on the coordinates of each displacement point of the storage net trolley. The cam curves are plotted based on the calculated coordinates of each displacement point of the storage trolley and the coordinates of each displacement point of the front curtain and the rear curtain, respectively; the first superimposed cam curve is created by performing Bezier linear interpolation between each plotted point of the storage trolley, and the second superimposed cam curve is created by performing Bezier linear interpolation between each plotted point of the front curtain and the rear curtain.

[0035] In the embodiments of this application, an input port is provided for the user to adjust the speed percentage at multiple displacement points, or the speed percentage at multiple displacement points is automatically determined based on the user's target uniformity distribution. A first superimposed cam curve for the storage trolley and a second superimposed cam curve for the front and rear curtains are created based on these speed percentages and respectively assigned to the drive shaft of the storage trolley and the motion shafts of the front and rear curtains, enabling the cross-laying machine to lay a fiber web that meets the user's uniformity distribution requirements. Furthermore, the embodiments of this application, based on existing cross-laying machines, adjust the uniformity distribution of the laid web by only changing the movement of the storage trolley and the front and rear curtains. This ingenious design allows for direct implementation in existing cross-laying machines without damaging their original structure and function, resulting in low implementation costs and ease of implementation and promotion. Attached Figure Description

[0036] Figure 1 This is a simplified structural diagram of an example cross-laying machine.

[0037] Figure 2 (a) and Figure 2 (b) Schematic diagrams showing the fiber web shape output from the exit curtain of an existing cross-laying machine and the final fiber web shape laid out.

[0038] Figure 3 This is a flowchart of a method for adjusting the uniformity of cross-laying machine according to an embodiment of the present invention.

[0039] Figure 4 This is a flowchart of a method for adjusting the uniformity of cross-laying machine according to another embodiment of the present invention.

[0040] Figure 5 This is a structural diagram of a device for adjusting the uniformity of cross-laying machine according to an embodiment of the present invention.

[0041] Figure 6 This is a schematic diagram of an example human-machine interface according to the present invention.

[0042] Figure 7 (a) and Figure 7 (b) Schematic diagrams showing the fiber web shape output from the cross-laying machine of the application device 500 and the final fiber web shape.

[0043] List of reference numerals in the attached diagram:

[0044] 101: Net storage trolley; 102: Net laying trolley; 103: Front curtain;

[0045] 104: Rear curtain; 105: Net exit curtain; 106: Net storage compensation trolley;

[0046] 107: Net laying compensation trolley; 501: First acquisition module; 502: Second acquisition module;

[0047] 5021: Human-Computer Interaction Submodule; 5022: Acquisition and Judgment Submodule; 5023: Determination and Acquisition Submodule; 503: Cam Curve Creation Module; 504: Output Module; 505: Storage Module;

[0048] 506: Acquisition and Judgment Module; 507: Fiber Web Uniformity Detection Unit; 600: Human-Machine Interface;

[0049] 601: Speed ​​percentage input port; 602: Automatic operation selection button; 603: Manual operation selection button; 604: System reset button; 605: First curve; 606: Second curve Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. All other technical solutions obtained by those skilled in the art based on the embodiments of this application fall within the scope of protection of this application.

[0051] Figure 3 This illustration shows a method 300 for adjusting the uniformity of a cross-laying machine according to an embodiment of the present invention. Figure 1 Taking the cross-laying machine shown as an example, such as Figure 3 As shown, method 300 includes:

[0052] Step S302: Obtain N displacement points of the reciprocating motion of the storage net trolley 101 and the position of the main shaft when the storage net trolley 101 moves to each displacement point, where N is an integer greater than 4.

[0053] Before step S302, the following steps are used, for example but not limited to, to determine the N displacement points of the reciprocating motion of the storage trolley 101 and the position of the main shaft when the storage trolley 101 moves to each displacement point: Obtain the current cam curve of the storage trolley 101 (e.g., from the drive controller of the storage shaft of the storage trolley 101); determine the maximum and minimum values ​​of the displacement of the storage trolley 101 in any direction based on the current cam curve, and calculate the displacement value of the storage trolley 101 in any direction based on the difference between the maximum and minimum values; divide the reciprocating displacement of the storage trolley 101 into N-1 displacement segments based on the displacement values ​​to obtain the corresponding N displacement points, and determine the position of the main shaft when the storage trolley 101 moves to each node. It can be understood that if a superimposed cam curve already exists, then the current cam curve is a composite curve of the initial cam curve and the superimposed cam curve. After determining the N displacement points of the reciprocating motion of the storage net trolley 101 and the position of the main shaft when the storage net trolley 101 moves to each displacement point, it is also preferable to "store the determined N displacement points of the reciprocating motion of the storage net trolley 101 and the position of the main shaft when the storage net trolley 101 moves to each displacement point into the storage module".

[0054] Furthermore, the reciprocating motion of the storage trolley 101 includes movement along a first direction and movement along a second direction. Preferably, the N displacement points include M displacement points of the storage trolley 101 moving along the first direction and M displacement points moving along the second direction, and the two sets of M displacement points correspond one-to-one and the displacement values ​​of the corresponding points are equal, N = 2M.

[0055] Step S304: Obtain the percentage of speed to be adjusted for each displacement point.

[0056] The "percentage of speed to be adjusted at each displacement point" in step S304 can be determined empirically or automatically obtained through the following steps: First, obtain the uniformity distribution of the fiber web currently laid out by the cross-laying machine; second, determine whether the uniformity distribution conforms to the target uniformity distribution; third, if it does not conform, compare the current uniformity distribution with the target uniformity distribution; if it conforms, return to step one; fourth, determine the percentage of speed to be adjusted at each displacement point based on the comparison result. It should be noted that the "uniformity distribution of the fiber web currently laid out by the cross-laying machine" in step one can be the uniformity distribution of the fiber web output from the output curtain 105 of the cross-laying machine (i.e., before the multi-roller drafting, needle punching, or hydroentangling process), or it can be the uniformity distribution of the fiber web after the multi-roller drafting, needle punching, or hydroentangling process.

[0057] Optionally, the aforementioned uniformity distribution includes the uniformity of the fiber web segment corresponding to each displacement point. Furthermore, the aforementioned third and fourth steps are further implemented as follows: if the uniformity does not meet the target uniformity, the uniformity of each fiber web segment is compared with the target uniformity of that segment; if the uniformity meets the target uniformity, the process returns to the first step; based on the comparison result, the percentage of speed to be adjusted for each displacement point is determined and obtained. For example, referring to Table 1 below, the current uniformity distribution of the fiber web laid by the cross-laying machine is 45 g / m². 2 43g / m 2 40g / m 2 37g / m 2 35g / m 2 35g / m 2 37g / m 2 40g / m 2 43g / m 2 45g / m 2 The target uniformity distribution is uniform and the target uniformity is 40g / m². 2 The percentage of speed to be adjusted for each displacement point can be determined as shown in Table 1. It should be noted that the contents of the table are merely illustrative and should not be construed as limiting the scope of protection of this invention.

[0058] Table 1:

[0059]

[0060] Step S306: Create the first superimposed cam curve of the storage net trolley 101 and the second superimposed cam curves of the front curtain 103 and the rear curtain 104 based on the position of the main shaft when the storage net trolley 101 moves to each displacement point and the percentage of speed to be adjusted at each displacement point.

[0061] Taking the aforementioned "N displacement points including M displacement points of the storage trolley 101 moving along the first direction and M displacement points moving along the second direction" as an example, step S306 further includes: determining the coordinates of each displacement point of the storage trolley 101 based on the position of the main shaft when the storage trolley 101 moves to each displacement point and the percentage of speed to be adjusted at each displacement point, wherein the coordinates of the kth displacement point are... P k The x represents the position of the main shaft when the storage trolley 101 moves to the k-th displacement point. k Y represents the percentage of velocity adjustment required at the k-th displacement point, l represents the displacement value between the k-th and (k-1)-th displacement points, and Y represents the displacement value between the k-th and (k-1)-th displacement points. k-1 Let Y0 represent the ordinate of the (k-1)th displacement point and Y0 = 0; calculate the coordinates of each displacement point of the front curtain 103 and the rear curtain 104 based on the coordinates of each displacement point of the storage trolley 101. Based on the calculated coordinates of each displacement point of the storage trolley 101 and the coordinates of each displacement point of the front curtain 103 and the rear curtain 104, cam curves are plotted. A first superimposed cam curve is created between the plotted points of the storage trolley 101 using a preset curve interpolation method, and a second superimposed cam curve is created between the plotted points of the front curtain 103 and the rear curtain 104 using a preset curve fitting method. The preset curve interpolation method includes, but is not limited to, Bezier linear interpolation and cubic spline interpolation. It is understood that since the coordinates of each displacement point of the storage trolley 101 have a specific relationship with the coordinates of each displacement point of the front curtain 103 and the rear curtain 104, other implementations of the present invention can also directly obtain the second superimposed cam curve based on this relationship and the first superimposed cam curve.

[0062] Step S308: The first superimposed cam curve is superimposed and given to the storage net shaft of the storage net trolley 101, and the second superimposed cam curve is superimposed and given to the front curtain shaft of the front curtain 103 and the rear curtain shaft of the rear curtain 104 respectively.

[0063] Transfer to Figure 4 This illustrates a method 400 for adjusting the uniformity of a cross-laying machine according to another embodiment of the present invention. For example... Figure 4 As shown, method 400 includes: cyclically executing "step S402-step S404-step S306-step S308-step S406-step S408" until the uniformity distribution of the fiber web currently laid by the cross-laying machine conforms to the target uniformity distribution (step S412). Specifically, step S402 is "comparing the uniformity distribution with the target uniformity distribution"; step S404 is "determining the percentage of speed to be adjusted at each displacement point based on the comparison result"; step S406 is "obtaining the uniformity distribution of the fiber web currently laid by the cross-laying machine"; and step S408 is "determining whether the uniformity distribution conforms to the target uniformity distribution".

[0064] Preferably, in each cycle, between step S404 and step S306, the following step is further included: obtaining from the aforementioned storage module the N displacement points of the reciprocating motion of the storage trolley 101 and the position of the main shaft when the storage trolley 101 moves to each displacement point.

[0065] Furthermore, method 400 also includes: periodically or sequentially acquiring the uniformity distribution of the fiber web currently laid by the cross-laying machine and determining whether the uniformity distribution conforms to the target uniformity distribution; if not, triggering the execution of the aforementioned loop. The timing period and cycle are greater than the loop period.

[0066] To implement the methods 300 and 400 of the above embodiments, other embodiments of the present invention also provide a device 500 for adjusting the uniformity of the web laying of a cross-laying machine, such as... Figure 5As shown, the device 500 includes a first acquisition module 501, a second acquisition module 502, a cam curve creation module 503, and an output module 504. It should be noted that since the following embodiments are for implementing the aforementioned method embodiments, each module in the device 500 is designed to implement each step of the aforementioned method. Therefore, the present invention is not limited to the following embodiments, and any device or module that can implement the above method should be included within the protection scope of the present invention. Furthermore, to save space, content identical to the aforementioned method portion is omitted here.

[0067] exist Figure 5 In the illustrated embodiment, the first acquisition module 501 is used to acquire N displacement points of the reciprocating motion of the storage trolley 101 and the position of the main shaft when the storage trolley 101 moves to each displacement point, where N is an integer greater than 4. Optionally, the N displacement points include M displacement points of the storage trolley 101 moving along a first direction and M displacement points moving along a second direction, and the two sets of M displacement points correspond one-to-one and the displacement values ​​corresponding to each other are equal. The reciprocating motion includes movement along the first direction and movement along the second direction, where N = 2M.

[0068] Furthermore, the first acquisition module 501 is also used to acquire the current cam curve of the storage trolley 101, determine the maximum and minimum values ​​of the displacement of the storage trolley 101 moving in any direction based on the current cam curve, calculate the displacement value of the storage trolley 101 moving in any direction based on the difference between the maximum and minimum values, and divide the reciprocating displacement of the storage trolley 101 into N-1 displacement segments based on the displacement value to obtain the corresponding N displacement points, determine the position of the main shaft when the storage trolley 101 moves to each node, and store it in the storage module 505. In this way, the displacement point and the position of the main shaft cannot be determined repeatedly in each cycle, and can be obtained from the storage module 505.

[0069] exist Figure 5 In the embodiment shown, the second acquisition module 502 is used to acquire the percentage of speed to be adjusted for each displacement point.

[0070] In one implementation, the second acquisition module 502 can obtain the percentage of velocity to be adjusted for each displacement point through manual input. Specifically, the second acquisition module 502 may include a human-computer interaction submodule 5021 (e.g., but not limited to, implemented as...). Figure 6 The human-machine interface 600 shown can be connected to an external input unit (such as a display screen). The human-machine interaction submodule 5021 is configured with speed percentage input ports 601 for N displacement points. The user can determine (for example, based on the process content in the process document) the speed percentage to be adjusted for each displacement point and manually fill it in the corresponding input port 601 in the human-machine interface 600, so that the second acquisition module 502 can acquire the speed percentage to be adjusted for each displacement point.

[0071] In another implementation, the second acquisition module 502 can also automatically determine, by machine, the percentage of speed to be adjusted at each displacement point. Specifically, such as... Figure 5 As shown, the second acquisition module 502 may further include an acquisition and judgment submodule 5022 and a determination and acquisition submodule 5023. The acquisition and judgment submodule 5022 is used to acquire the uniformity distribution of the fiber web currently laid by the cross-laying machine and determine whether the uniformity distribution conforms to the target uniformity distribution. The determination and acquisition submodule 5023 is used to compare the uniformity distribution with the target uniformity distribution if it does not conform to the target uniformity distribution and determine the percentage of speed to be adjusted for each displacement point based on the comparison result.

[0072] Furthermore, the aforementioned uniformity distribution includes the uniformity of the fiber web segment corresponding to each displacement point. Therefore, the determination and acquisition submodule 5023 is also used to compare the uniformity of each fiber web segment with the target uniformity of that segment if a mismatch is found, and to determine the percentage of speed to be adjusted for each displacement point based on the comparison result.

[0073] exist Figure 5 In the embodiment shown, the cam curve creation module 503 is used to create a first superimposed cam curve of the storage net trolley 101 and a second superimposed cam curve of the front curtain 103 and the rear curtain 104 based on the position of the main shaft when the storage net trolley 101 moves to each displacement point and the percentage of speed to be adjusted at each displacement point.

[0074] Optionally, the cam curve creation module 503 is further configured to, respectively, create M displacement points moving along the first direction and M displacement points moving along the second direction according to...

[0075] The coordinates of each displacement point of the storage net trolley 101 are determined by the position of the main shaft when the trolley reaches each displacement point and the percentage of speed adjustment required at each displacement point. The coordinates of the k-th displacement point are... P k The x represents the position of the main shaft when the storage trolley 101 moves to the k-th displacement point. k Y represents the percentage of velocity adjustment required at the k-th displacement point, l represents the displacement value between the k-th and (k-1)-th displacement points, and Y represents the displacement value between the k-th and (k-1)-th displacement points. k-1 Let Y0 represent the ordinate of the (k-1)th displacement point and Y0 = 0; calculate the coordinates of each displacement point of the front curtain 103 and the rear curtain 104 based on the coordinates of each displacement point of the storage trolley 101. Based on the calculated coordinates of each displacement point of the storage trolley 101 and the coordinates of each displacement point of the front curtain 103 and the rear curtain 104, cam curves are plotted. A first superimposed cam curve is created between the plotted points of the storage trolley 101 using a preset curve interpolation method, and a second superimposed cam curve is created between the plotted points of the front curtain 103 and the rear curtain 104 using a preset curve fitting method. The preset curve interpolation method includes, but is not limited to, Bezier linear interpolation and cubic spline interpolation.

[0076] exist Figure 5 In the embodiment shown, the output module 504 is used to superimpose the first superimposed cam curve onto the storage shaft of the storage net trolley 101, and superimpose the second superimposed cam curve onto the front curtain shaft of the front curtain 103 and the rear curtain shaft of the rear curtain 104, respectively.

[0077] In addition, optionally, the device 500 also includes an acquisition and judgment module 506, which is used to acquire the uniformity distribution of the fiber web currently laid by the cross-laying machine in real time, at regular intervals or periodically, and judge whether the uniformity distribution conforms to the target uniformity distribution. If it does not conform, the acquisition and judgment submodule 5023, the cam curve creation module 503, the output module 504, and the acquisition and judgment submodule 5022 are called and executed in a loop until the uniformity distribution of the fiber web currently laid by the cross-laying machine conforms to the target uniformity distribution.

[0078] Optionally, the device 500 may also include a web uniformity detection unit 507 or be connected in communication with an external web uniformity detection device (e.g., but not limited to a nonwoven fabric quality / moisture online monitoring and control system). The nonwoven fabric quality / moisture online monitoring and control system acquires (in real time or in response to acquisition instructions from the target module) the uniformity distribution of the web currently laid out by the cross-laying machine. The acquisition and judgment module 506 and the acquisition and judgment submodule 5022 acquire the uniformity distribution of the web currently laid out by the cross-laying machine from the nonwoven fabric quality / moisture online monitoring and control system.

[0079] To better illustrate the technical effects of the present invention, the device 500 of the present invention is applied in... Figure 1 In the cross-laying machine shown (before application device 500, the cross-laying machine lays out a wire mesh that is thin in the middle and thick on both sides), the fiber mesh output from the cross-laying machine output curtain 105 of application device 500 is as follows: Figure 7 As shown in (a), the final fiber web shape is as follows: Figure 7 As shown in (b).

[0080] In addition, one embodiment of the present invention also provides a computing device. The electronic device includes a processor, a communication interface, and memory. The processor, communication interface, and memory can communicate with each other via a communication bus. The communication interface is used to communicate with other electronic devices, such as terminal devices or servers. The processor is used to execute machine-readable programs, specifically performing the relevant steps in the above-described method embodiments, that is, performing the steps in the methods described in the above-described embodiments. Specifically, the machine-readable program may include program code, which includes computer operation instructions. The processor may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. The one or more processors included in the electronic device may be processors of the same type, such as one or more CPUs; or they may be processors of different types, such as one or more CPUs and one or more ASICs. The memory is used to store the machine-readable program. The memory may include high-speed RAM memory and may also include non-volatile memory, such as at least one disk storage device.

[0081] Furthermore, one embodiment of the present invention also provides a computer-readable medium storing computer instructions, which, when executed by a processor, cause the processor to perform the above-described method embodiments. It should be noted that, depending on the implementation needs, the various components / steps described in the embodiments of the present invention can be divided into more components / steps, or two or more components / steps or parts of the operations of components / steps can be combined into new components / steps to achieve the objectives of the embodiments of the present invention.

[0082] It should be noted that the methods according to embodiments of the present invention can be implemented in hardware, firmware, or as software or computer code that can be stored in a recording medium (such as CD ROM, RAM, floppy disk, hard disk, or magneto-optical disk), or as computer code originally stored in a remote recording medium or a non-transitory machine-readable medium and subsequently stored in a local recording medium, downloaded via a network. Thus, the methods described herein can be processed by software stored on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware (such as an ASIC or FPGA). It is understood that the computer, processor, microprocessor controller, or programmable hardware includes storage components (e.g., RAM, ROM, flash memory, etc.) capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods described herein. Furthermore, when a general-purpose computer accesses code used to implement the methods shown herein, the execution of the code transforms the general-purpose computer into a dedicated computer for executing the methods shown herein.

[0083] It should be noted that in the claims and specification of this patent, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0084] Although the invention has been illustrated and described with reference to certain preferred embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims

1. A method for adjusting the uniformity of web laying in a cross-laying machine, the cross-laying machine comprising a web storage trolley (101), a web laying trolley (102), and a front curtain (103) and a rear curtain (104) arranged between the web storage trolley (101) and the web laying trolley (102), characterized in that, The method includes: A obtains N displacement points of the reciprocating motion of the storage net trolley (101) and the position of the main shaft when the storage net trolley (101) moves to each displacement point. N is an integer greater than 4. The N displacement points include M displacement points of the storage net trolley (101) moving along the first direction and M displacement points moving along the second direction. The two sets of M displacement points correspond one-to-one and the displacement values ​​corresponding to each other are equal. The reciprocating motion includes the movement along the first direction and the movement along the second direction. N=2M. B obtains the percentage of velocity to be adjusted for each of the displacement points; Step C creates a first superimposed cam curve for the storage net trolley (101) and a second superimposed cam curve for the front curtain (103) and the rear curtain (104) based on the position of the main shaft when the storage net trolley (101) moves to each displacement point and the percentage of speed adjustment required for each displacement point; Step C further includes: for the M displacement points moving along the first direction and the M displacement points moving along the second direction, the coordinates of each displacement point of the storage net trolley (101) are determined based on the position of the main shaft when the storage net trolley (101) moves to each displacement point and the percentage of speed adjustment required for each displacement point, wherein the coordinates of the kth displacement point are... P k This indicates the position of the main shaft when the storage trolley (101) moves to the k-th displacement point. This represents the percentage of velocity to be adjusted at the k-th displacement point. Y represents the displacement value between the k-th displacement point and the (k-1)-th displacement point. k-1 Let Y0 represent the ordinate of the (k-1)th displacement point and Y0 = 0; calculate the coordinates of each displacement point of the front curtain (103) and the rear curtain (104) based on the coordinates of each displacement point of the storage trolley (101). Based on the calculated coordinates of each displacement point of the storage trolley (101) and the coordinates of each displacement point of the front curtain (103) and the rear curtain (104), the cam curves are plotted. The first superimposed cam curve is created by interpolating between the plotted points of the storage trolley (101), and the second superimposed cam curve is created by interpolating between the plotted points of the front curtain (103) and the rear curtain (104). D superimposes the first superimposed cam curve onto the storage net shaft of the storage net trolley (101), and superimposes the second superimposed cam curve onto the front curtain shaft of the front curtain (103) and the rear curtain shaft of the rear curtain (104), respectively.

2. The method according to claim 1, characterized in that, Step C further includes: The first superimposed cam curve is created by performing Bezier linear interpolation between each plotting point of the storage net trolley (101), and the second superimposed cam curve is created by performing Bezier linear interpolation between each plotting point of the front curtain (103) and the rear curtain (104).

3. The method according to claim 1, characterized in that, Before step A, the following are also included: Obtain the current cam curve of the storage network trolley (101); The maximum and minimum values ​​of the displacement of the storage trolley (101) moving in any direction are determined according to the current cam curve, and the displacement value of the storage trolley (101) moving in any direction is calculated according to the difference between the maximum and minimum values. The displacement of the reciprocating motion of the storage trolley (101) is divided into N based on the displacement value. One displacement segment yields N corresponding displacement points, and the position of the main shaft when the storage trolley (101) moves to each node is determined.

4. The method according to claim 1, characterized in that, Step B is preceded by: E obtains the uniformity distribution of the fiber web currently laid by the cross-laying machine; F determines whether the uniformity distribution conforms to the target uniformity distribution; If G does not meet the requirements, then compare the uniformity distribution with the target uniformity distribution; otherwise, the process ends. And step B further includes: Based on the comparison results, determine the percentage of speed to be adjusted for each displacement point, and obtain the percentage of speed to be adjusted for each displacement point.

5. The method according to claim 4, characterized in that, The uniformity distribution includes the uniformity of the fiber web segment corresponding to each displacement point; Step G further includes: if it does not meet the requirements, comparing the uniformity of each fiber web segment with the target uniformity of the fiber web segment; and step B further includes: determining the percentage of speed to be adjusted for each displacement point based on the comparison result, and obtaining the percentage of speed to be adjusted for each displacement point.

6. The method according to claim 4 or 5, characterized in that, The method further includes: The uniformity distribution of the fiber web currently laid by the cross-laying machine is periodically acquired and it is determined whether the uniformity distribution conforms to the target uniformity distribution. If it does not conform, "step G-step B-step C-step D-step E-step F" is executed in a loop until the uniformity distribution of the fiber web currently laid by the cross-laying machine conforms to the target uniformity distribution.

7. A device for adjusting the uniformity of web laying in a cross-laying machine, the cross-laying machine comprising a web storage trolley (101), a web laying trolley (102), and a front curtain (103) and a rear curtain (104) arranged between the web storage trolley (101) and the web laying trolley (102), characterized in that, The device includes: The first acquisition module (501) is used to acquire N displacement points of the reciprocating motion of the storage net trolley (101) and the position of the main shaft when the storage net trolley (101) moves to each displacement point. N is an integer greater than 4. The N displacement points include M displacement points of the storage net trolley (101) moving along the first direction and M displacement points moving along the second direction. The two sets of M displacement points correspond one-to-one and the displacement values ​​corresponding to each other are equal. The reciprocating motion includes the movement along the first direction and the movement along the second direction. N=2M. The second acquisition module (502) is used to acquire the percentage of speed to be adjusted for each displacement point; The cam curve creation module (503) is used to create a first superimposed cam curve of the storage net trolley (101) and a second superimposed cam curve of the front curtain (103) and the rear curtain (104) based on the position of the main shaft when the storage net trolley (101) moves to each displacement point and the percentage of speed adjustment required for each displacement point; the cam curve creation module (503) is also used to: for the M displacement points moving along the first direction and the M displacement points moving along the second direction, respectively, determine the coordinates of each displacement point of the storage net trolley (101) based on the position of the main shaft when the storage net trolley (101) moves to each displacement point and the percentage of speed adjustment required for each displacement point, wherein the coordinates of the kth displacement point are: P k This indicates the position of the main shaft when the storage trolley (101) moves to the k-th displacement point. This represents the percentage of velocity to be adjusted at the k-th displacement point. Y represents the displacement value between the k-th displacement point and the (k-1)-th displacement point. k-1 Let Y0 represent the ordinate of the (k-1)th displacement point and Y0 = 0; calculate the coordinates of each displacement point of the front curtain (103) and the rear curtain (104) based on the coordinates of each displacement point of the storage trolley (101). The cam curves are plotted based on the coordinates of each displacement point of the storage trolley (101) and the coordinates of each displacement point of the front curtain (103) and the rear curtain (104); the first superimposed cam curve is created by interpolating between the plotted points of the storage trolley (101), and the second superimposed cam curve is created by interpolating between the plotted points of the front curtain (103) and the rear curtain (104). The output module (504) is used to superimpose the first superimposed cam curve onto the storage net shaft of the storage net trolley (101), and superimpose the second superimposed cam curve onto the front curtain shaft of the front curtain (103) and the rear curtain shaft of the rear curtain (104), respectively.

8. The apparatus according to claim 7, characterized in that, The cam curve creation module (503) is also used to: perform Bezier linear interpolation between each plotting point of the storage net trolley (101) to create the first superimposed cam curve, and perform Bezier linear interpolation between each plotting point of the front curtain (103) and the rear curtain (104) to create the second superimposed cam curve.

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