CN-116657332-B - Method and device for adjusting lapping uniformity of cross lapping machine

CN116657332BCN 116657332 BCN116657332 BCN 116657332BCN-116657332-B

Abstract

The embodiment of the application provides a method for adjusting the lapping uniformity of a cross lapping machine. The method comprises the steps of obtaining N displacement points of reciprocating motion of the net storage trolley and positions of a main shaft when the net storage trolley moves to each displacement point, obtaining speed percentages to be adjusted by each displacement point, creating a first superposition cam curve of the net storage trolley and a second superposition cam curve of the front curtain and the rear curtain according to the positions of the main shaft when the net storage trolley moves to each displacement point and the speed percentages to be adjusted by each displacement point, superposing the first superposition cam curve on a net storage shaft of the net storage trolley, and superposing the second superposition cam curve on a front curtain shaft of the front curtain and a rear curtain shaft of the rear curtain respectively. Embodiments of the present application are capable of laying out webs that meet any uniformity distribution requirements.

Inventors

JIA XIAOLONG
WANG QINGLIN

Assignees

西门子（中国）有限公司

Dates

Publication Date: 20260505
Application Date: 20230620

Claims (8)

1. A method of adjusting the lapping uniformity of a cross lapping machine comprising a storage trolley (101), a lapping trolley (102), and a front curtain (103) and a rear curtain (104) arranged between the storage trolley (101) and the lapping trolley (102), characterized in that the method comprises: The method comprises the steps that A, N displacement points of reciprocating motion of a net storage trolley (101) and positions of a main shaft when the net storage trolley (101) moves to each displacement point are obtained, N is an integer larger than 4, the N displacement points comprise M displacement points of the net storage trolley (101) moving along a first direction and M displacement points of the net storage trolley moving along a second direction, the two groups of M displacement points correspond to each other one by one and are equal in displacement value, and the reciprocating motion comprises the movement along the first direction and the movement along the second direction, and N=2M; B, acquiring the speed percentage to be adjusted of each displacement point; C creating a first superimposed cam curve of the net storage trolley (101) and a second superimposed cam curve of the front curtain (103) and the rear curtain (104) according to the position of a main shaft when the net storage trolley (101) moves to each displacement point and the speed percentage to be adjusted by each displacement point, wherein the step C further comprises the steps of determining the coordinates of each displacement point of the net storage trolley (101) according to the position of the main shaft when the net storage trolley (101) moves to each displacement point and the speed percentage to be adjusted by each displacement point for M displacement points moving along the first direction and M displacement points moving along the second direction, wherein the coordinates of the kth displacement point are as follows P k denotes the position of the main shaft when the net storage trolley (101) moves to the kth displacement point, Representing the percentage of speed the kth displacement point is to adjust, Representing the displacement value between the kth displacement point and the kth-1 displacement point, Y k-1 representing the ordinate of the kth-1 displacement point and Y 0 =0, calculating the coordinates of the displacement points of the front curtain (103) and the rear curtain (104) as the coordinates of the displacement points of the mesh-storage trolley (101) The cam curve is traced according to the calculated coordinates of each displacement point of the net storage trolley (101) and the coordinates of each displacement point of the front curtain (103) and the rear curtain (104); interpolating between the points of the mesh storage trolley (101) to create the first superimposed cam curve, and interpolating between the points of the front curtain (103) and the rear curtain (104) to create the second superimposed cam curve; d superimposing the first superimposed cam curve to a net axle of the net trolley (101) and the second superimposed cam curve to a front curtain axle of the front curtain (103) and a rear curtain axle of the rear curtain (104), respectively.
2. The method of claim 1, wherein step C further comprises: Bessel linear interpolation is performed between the points of the mesh storage trolley (101) to create the first superimposed cam curve, and Bessel linear interpolation is performed between the points of the front curtain (103) and the rear curtain (104) to create the second superimposed cam curve.
3. The method of claim 1, further comprising, prior to step a: Acquiring a current cam curve of the net storage trolley (101); Determining the maximum value and the minimum value of the displacement of the net storage trolley (101) moving along any direction according to the current cam curve, and calculating the displacement value of the net storage trolley (101) moving along any direction according to the difference value of the maximum value and the minimum value; Dividing the displacement of the reciprocating motion of the net storage trolley (101) into N according to the displacement value And the 1 displacement section obtains N corresponding displacement points and determines the position of a main shaft when the net storage trolley (101) moves to each node.
4. The method of claim 1, further comprising, prior to step B: E, obtaining uniformity distribution of the fiber web currently paved by the cross lapping machine; f, judging whether the uniformity distribution accords with a target uniformity distribution; G, if not, comparing the uniformity distribution with the target uniformity distribution, otherwise, ending the execution; and, the step B further includes: and determining the speed percentage to be adjusted of each displacement point according to the comparison result, and acquiring the speed percentage to be adjusted of each displacement point.
5. The method of claim 4, wherein the uniformity profile comprises a uniformity of the web segments for each of the displacement points; Step G further includes comparing the uniformity of each of the web segments with a target uniformity for the web segment if not, and step B further includes determining a corresponding percentage of speed to be adjusted for each of the displacement points based on the comparison and obtaining the percentage of speed to be adjusted for each of the displacement points.
6. The method according to claim 4 or 5, characterized in that the method further comprises: and periodically acquiring the uniformity distribution of the fiber web currently paved by the cross lapping machine, judging whether the uniformity distribution accords with the target uniformity distribution, and if not, circularly executing the steps of G-B-C-D-E-F until the uniformity distribution of the fiber web currently paved by the cross lapping machine accords with the target uniformity distribution.
7. A device for adjusting the lapping uniformity of a cross lapping machine comprising a storage trolley (101), a lapping trolley (102) and a front curtain (103) and a rear curtain (104) arranged between the storage trolley (101) and the lapping trolley (102), characterized in that the device comprises: A first obtaining module (501) configured to obtain N displacement points of the reciprocal motion of the mesh storage trolley (101) and positions of a main shaft when the mesh storage trolley (101) moves to each displacement point, where N is an integer greater than 4, the N displacement points include M displacement points of the movement of the mesh storage trolley (101) along a first direction and M displacement points of the movement along a second direction, and two sets of the M displacement points are in one-to-one correspondence and have displacement values corresponding to each other equal, and the reciprocal motion includes the movement along the first direction and the movement along the second direction, where n=2m; A second acquisition module (502) for acquiring a percentage of speed to be adjusted for each of the displacement points; A cam curve creation module (503) for creating a first superimposed cam curve of the net storage trolley (101) and a second superimposed cam curve of the front curtain (103) and the rear curtain (104) according to the position of a main shaft when the net storage trolley (101) moves to each displacement point and the speed percentage to be adjusted by each displacement point, wherein the cam curve creation module (503) is further used for determining the coordinates of each displacement point of the net storage trolley (101) according to the position of the main shaft when the net storage trolley (101) moves to each displacement point and the speed percentage to be adjusted by each displacement point for the M displacement points moving along the first direction and the M displacement points moving along the second direction, wherein the coordinates of the kth displacement point are P k denotes the position of the main shaft when the storage-network trolley (101) moves to the kth displacement point, Representing the percentage of speed the kth displacement point is to adjust, Representing the displacement value between the kth displacement point and the kth-1 displacement point, Y k-1 representing the ordinate of the kth-1 displacement point and Y 0 =0, calculating the coordinates of the displacement points of the front curtain (103) and the rear curtain (104) as the coordinates of the displacement points of the mesh-storage trolley (101) The cam curve is traced according to the calculated coordinates of each displacement point of the net storage trolley (101) and the coordinates of each displacement point of the front curtain (103) and the rear curtain (104); and interpolating between the points of the mesh storage trolley (101) to create the first superimposed cam curve, and interpolating between the points of the front curtain (103) and the rear curtain (104) to create the second superimposed cam curve; -an output module (504) for superimposing the first superimposed cam curve to a storage wire shaft of the storage wire trolley (101) and for superimposing the second superimposed cam curve to a front curtain shaft of the front curtain (103) and to a rear curtain shaft of the rear curtain (104), respectively.
8. The apparatus of claim 7, wherein the cam curve creation module (503) is further configured to create the first superimposed cam curve by performing a bezier linear interpolation between points of the mesh car (101) and create the second superimposed cam curve by performing a bezier linear interpolation between points of the front curtain (103) and the rear curtain (104).

Description

Method and device for adjusting lapping uniformity of cross lapping machine Technical Field The invention relates to a cross lapping machine and the control field thereof, in particular to a method and a device for adjusting lapping uniformity of the cross lapping machine. Background Cross lapping machines are critical devices in nonwoven production lines, the primary function being to achieve multi-layer lapping of the web and performance often determining the yield and quality of the nonwoven. As shown in fig. 1, the cross lapping machine mainly comprises a net outlet curtain, a net storage trolley, a lapping trolley, a front curtain, a rear curtain, a net outlet curtain and the like, wherein the front curtain, the rear curtain and the net outlet curtain are arranged between the net storage trolley and the lapping trolley. The conventional cross lapping machine can output a web with uniform thickness at the web outlet curtain, as shown in fig. 2 (a), but due to the characteristics of raw materials, the web output by the web outlet curtain is often deformed due to the tensile force generated by the subsequent process (such as multi-roller drafting, needling or hydroentangling process), so that the thickness of the finally laid web is uneven, and the form of the middle thin and two sides is shown in fig. 2 (b). Disclosure of Invention In view of the above, the present invention provides a method and apparatus for adjusting the lapping uniformity of a cross lapping machine, which at least partially solves the above-mentioned problems. A first aspect of the present invention provides a method of adjusting the lapping uniformity of a cross lapping machine, the cross lapping machine comprising a storage trolley, a lapping trolley, and a front curtain and a rear curtain disposed between the storage trolley and the lapping trolley, the method comprising: the method comprises the steps that A, N displacement points of the reciprocating motion of the storage net trolley and the positions of a main shaft when the storage net trolley moves to each displacement point are obtained, wherein N is an integer greater than 4; B, acquiring the speed percentage to be adjusted of each displacement point; C, creating a first superposition cam curve of the net storage trolley according to the position of a main shaft when the net storage trolley moves to each displacement point and the speed percentage to be adjusted by each displacement point, and a second superposition cam curve of the front curtain and the rear curtain; D superimposing the first superimposed cam curve to a net axle of the net trolley and superimposing the second superimposed cam curve to a front curtain axle of the front curtain and a rear curtain axle of the rear curtain, respectively. In one possible implementation manner, the N displacement points include M displacement points of the storage net trolley moving along a first direction and M displacement points of the storage net trolley moving along a second direction, and two groups of the M displacement points are in one-to-one correspondence and have equal displacement values corresponding to each other, and the reciprocating motion includes the movement along the first direction and the movement along the second direction, where n=2m. In one possible implementation, step C further includes: for the M displacement points moving along the first direction and the M displacement points moving along the second direction, determining the coordinates of each displacement point of the storage net trolley according to the position of a main shaft when the storage net trolley moves to each displacement point and the speed percentage to be adjusted by each displacement point, wherein the coordinates of the kth displacement point are as follows P k denotes the position of the main shaft when the storage network trolley moves to the kth displacement point, x k denotes the speed percentage to be adjusted by the kth displacement point, l denotes the displacement value between the kth displacement point and the kth-1 displacement point, Y k-1 denotes the ordinate of the kth-1 displacement point and Y 0 =0; Calculating the coordinates of each displacement point of the front curtain and the rear curtain as the coordinates of each displacement point of the storage net trolley Carrying out cam curve tracing according to the calculated coordinates of each displacement point of the net storage trolley and the calculated coordinates of each displacement point of the front curtain and the rear curtain; Performing Bessel linear interpolation between the points of the mesh storage trolley to create the first superposition cam curve, and performing Bessel linear interpolation between the points of the front curtain and the rear curtain to create the second superposition cam curve. In one possible implementation, before step a, the method further includes: acquiring a current cam curve of the net storage trolley; Determining the m