Molding method and molding equipment of composite material belt for hygienic products

Abstract

The invention relates to the technical field of hygienic product manufacturing, in particular to a composite material belt forming method for hygienic products, which comprises the following steps: a continuous raw material belt is cut by a knife roll and an anvil roll to form segmented sheets; one part of the sheets are conveyed to the transverse pitch changing wheel through the first transfer wheel, and the other part of the sheets are conveyed to the transverse pitch changing wheel through the second transfer wheel; the paired sheets are converged on the transverse variable-pitch wheel, and the transverse distance is further increased on the transverse variable-pitch wheel; the paired sheets are separated by a longitudinal distance on the longitudinal variable-pitch wheel; and finally, the sheets with the transverse spacing and the longitudinal spacing meeting the requirements are attached to the main material belt, and the composite material belt is formed. Through programmed adjustment of the rotating speed of the independent driving adsorption disc or the cam disc with different groove curves, the automatic suction device can be quickly adapted to production of hygienic products with different sizes, and the downtime is remarkably shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of hygiene product manufacturing, and more specifically, it relates to a method and equipment for forming a composite material belt for hygiene products. Background Art

[0002] In existing production equipment for disposable hygiene products, the adjustment of the lateral and longitudinal spacing of sheets usually relies on the adjustment of complex mechanical structures, such as replacing multiple rollers or adjusting complex transmission mechanisms. This solution is not only time-consuming but also has a high maintenance cost and is difficult to quickly adapt to the production requirements of different sizes.

[0003] Therefore, there is an urgent need for a forming process with a simple structure and easy adjustment to improve production flexibility and efficiency. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a method for forming a composite material belt for hygiene products, which can quickly adjust the sheet spacing by optimizing the sheet transfer and variable pitch mechanism to meet the production requirements of different sizes.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions: A method for forming a composite material belt for hygiene products includes the following steps: (1) The raw material belt roll is cut into segmented sheets by a knife roll and an anvil roll, and the sheets are arranged staggeredly and adjacent sheets face in opposite directions; (2) Through the negative pressure adsorption function of the anvil roll, part of the sheets are transported to the lateral variable pitch wheel through the first transfer wheel, and this part of the sheets moves laterally outward during the transportation; the other part of the sheets are transported to the lateral variable pitch wheel through the second transfer wheel, and this other part of the sheets moves laterally inward during the transportation; (3) On the lateral variable pitch wheel, through the synchronous lateral movement of the outer adsorption disc and the inner adsorption disc, the lateral spacing of the paired sheets reaches the preset value; (4) The sheets with adjusted lateral spacing are transported to the longitudinal variable pitch wheel, and the longitudinal spacing of the paired sheets is adjusted by an independently driven adsorption disc; (5) The sheets with adjusted longitudinal spacing are attached to the main material belt to form a composite material belt.

[0006] Optionally, the negative pressure adsorption area of the anvil roll is divided into a continuous negative pressure area and an intermittent negative pressure area; the intermittent negative pressure area periodically turns on and off the negative pressure to transport part of the sheets to the first transfer wheel and the other part of the sheets to the second transfer wheel.

[0007] Optionally, a lead screw nut assembly driven by a cam disc is provided on the lateral pitch wheel, and the lead screw nut assembly drives the outer suction disc and the inner suction disc to move horizontally synchronously; the lateral pitch of the sheet is changed by replacing the cam disc with different groove curves.

[0008] Optionally, the independently driven suction disc is controlled by an independently driven motor for its rotation speed, and the longitudinal pitch of the sheet is changed by adjusting the speed control curve of the independently driven motor.

[0009] Optionally, when switching to sanitary articles of different sizes, replace the cam disc with corresponding profile grooves without changing the mechanical structure.

[0010] Optionally, the anvil roller includes a first mounting seat, a first rotating shaft is provided on the first mounting seat, and an annular suction disc is provided on the first rotating shaft; a negative pressure connection seat for providing negative pressure to the annular suction disc is provided on the first mounting seat; intermittent negative pressure grooves corresponding to the intermittent negative pressure areas are formed in the negative pressure connection seat, and continuous negative pressure grooves corresponding to the connecting negative pressure areas are formed in the negative pressure connection seat, and the continuous negative pressure grooves and the intermittent negative pressure grooves are not communicated with each other; a rotary valve for intermittently communicating the intermittent negative pressure grooves with the negative pressure generating device is rotatably provided on the negative pressure connection seat, and the rotary valve is in meshing transmission with the first rotating shaft.

[0011] Optionally, the second transfer wheel includes a second mounting seat, a second rotating shaft is provided on the second mounting seat, a first suction cup seat is provided on the second rotating shaft, and a plurality of suction cup assemblies are slidably provided on the first suction cup seat; a driving wheel is provided on the second mounting seat, and a driving groove for driving the suction cup assemblies to reciprocate horizontally is formed in the driving wheel.

[0012] Optionally, the lateral pitch wheel includes a main shaft, a second suction cup seat is rotatably provided on the main shaft, a plurality of lead screws with positive and reverse threads at the ends are provided on the second suction cup seat, both ends of the lead screws are threadedly connected with lead screw nuts, an outer suction disc for adsorbing part of the sheet is provided on the lead screw nut at one end of the lead screw, an inner suction disc for adsorbing another part of the sheet is provided on the lead screw nut at the other end of the lead screw, a swing arm is provided at the end of the lead screw, and a cam bearing is provided on the swing arm; the lead screw, the lead screw nut, the swing arm and the cam bearing form a lead screw nut assembly; a cam disc is provided at the end of the main shaft, and a swing groove for accommodating the cam bearing and then driving the swing arm to swing through the cam bearing is formed in the cam disc.

[0013] Optionally, the longitudinal pitch wheel includes a third mounting seat, a third rotating shaft, a fourth rotating shaft, a fifth rotating shaft and a sixth rotating shaft are coaxially and rotatably provided on the third mounting seat; the fourth rotating shaft is sleeved on the third rotating shaft, the fifth rotating shaft is sleeved on the fourth rotating shaft, the sixth rotating shaft is sleeved on the fifth rotating shaft, and the third mounting seat is sleeved on the sixth rotating shaft; two independently driven suction discs are provided on each of the third rotating shaft, the fourth rotating shaft, the fifth rotating shaft and the sixth rotating shaft, and one of the independently driven suction discs is used for adsorbing part of the sheet, and the other independently driven suction disc is used for adsorbing another part of the sheet.

[0014] Another object of the present invention is to provide a composite material belt forming device for sanitary products, which forms a composite material belt by the aforementioned composite material belt forming method.

[0015] The present invention has the following beneficial effects: By programmatically adjusting the rotation speed of the independently driven suction disc or the cam disc with different groove curves, it is possible to quickly adapt to the production of sanitary products of different sizes and significantly reduce the downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a process flow chart of the forming method in the present invention; Figure 2 is a schematic structural diagram of the anvil roll in the present invention; Figure 3 is a side view of the anvil roll in the present invention; Figure 4 is Figure 3 a cross-sectional view taken along the A-A section; Figure 5 is a first partial exploded view of the anvil roll in the present invention; Figure 6 is a second partial exploded view of the anvil roll in the present invention; Figure 7 is a schematic structural diagram of the second transfer wheel in the present invention; Figure 8 is a cross-sectional view of the second transfer wheel in the present invention; Figure 9 is a partial structural schematic diagram of the second transfer wheel in the present invention; Figure 10 is Figure 9 a top view of Figure 11 is a schematic structural diagram of the lateral pitch-changing wheel in the present invention; Figure 12 is a cross-sectional view of the lateral pitch-changing wheel in the present invention; Figure 13 is a front view of the cam disc in the present invention; Figure 14 is a schematic structural diagram of the longitudinal pitch-changing wheel in the present invention; Figure 15 is a cross-sectional view of the longitudinal pitch-changing wheel in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to make the objectives, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0018] In the present invention, unless otherwise clearly specified or limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] A method for forming a composite material belt for sanitary articles, as Figures 1 - 15 shown, includes the following steps: (1) The raw material belt 7 is roll-cut into segmented sheets 71 by the knife roll 1 and the anvil roll 2, and the sheets 71 are arranged staggeredly and the adjacent sheets 71 face in opposite directions; (2) Through the negative pressure adsorption function of the anvil roll 2, part of the sheets 71 are conveyed to the lateral pitch-changing wheel 5 through the first transfer wheel 3, and this part of the sheets 71 is laterally moved outward during the conveying process; the other part of the sheets 71 is conveyed to the lateral pitch-changing wheel 5 through the second transfer wheel 4, and this other part of the sheets 71 is laterally moved inward during the conveying process; (3) On the lateral pitch-changing wheel 5, through the synchronous lateral movement of the outer suction disc 55 and the inner suction disc 56, the lateral pitch between the paired sheets 71 reaches a preset value; (4) The sheets 71 with adjusted lateral pitch are conveyed to the longitudinal pitch-changing wheel 6, and the longitudinal pitch between the paired sheets 71 is adjusted by the independently driven suction disc 66; (5) The sheets 71 with adjusted longitudinal pitch are attached to the main material belt 8 to form a composite material belt 9.

[0021] In order to clearly illustrate the method for forming a composite material belt for sanitary articles of the present invention, the structures of the knife roll 1, the anvil roll 2, the first transfer wheel 3, the second transfer wheel 4, the lateral pitch-changing wheel 5, and the longitudinal pitch-changing wheel 6 involved will be described as follows.

[0022] The specific structure and shape of the knife roll 1 can be set according to the conventional structure in the art and the shape of the sheet 71, and will not be specifically described here.

[0023] As Figures 2 - 6As shown, the anvil roller 2 includes a first mounting base 21. A first rotating shaft 22 is provided on the first mounting base 21, and an annular suction disc 23 is provided on the first rotating shaft 22. A negative pressure connection base 24 for providing negative pressure to the annular suction disc 23 is provided on the first mounting base 21. A discontinuous negative pressure groove 241 corresponding to the discontinuous negative pressure area is formed in the negative pressure connection base 24, and a continuous negative pressure groove 242 corresponding to the connected negative pressure area is formed in the negative pressure connection base 24. The continuous negative pressure groove 242 and the discontinuous negative pressure groove 241 are not communicated with each other. A rotary valve 25 for intermittently communicating the discontinuous negative pressure groove 241 with the negative pressure generating device is rotatably provided on the negative pressure connection base 24, and the rotary valve 25 is in meshing transmission with the first rotating shaft 22.

[0024] Specifically, the first mounting base 21 is mounted in a U shape on the production line of sanitary products. The first rotating shaft 22 is mounted in the middle position thereof through a bearing, and the first rotating shaft 22 rotates in the first mounting base 21 under the drive of an external power mechanism. The annular suction disc 23 is mounted on the first rotating shaft 22 by key connection, tight fit or other existing fixing methods. A plurality of suction holes for sucking the sheet material 71 are formed on the outer wall of the annular suction disc 23, and a suction cup hole 231 for communicating with the continuous negative pressure groove 242 or the discontinuous negative pressure groove 241 is provided on the outer side of its side wall. The negative pressure connection base 24 is fixedly mounted on the first mounting base 21 through four connecting rods and is relatively close to the annular suction disc 23 to generate negative pressure. A trapezoidal discontinuous negative pressure groove 241 is formed on the side of the negative pressure connection base 24 facing the annular suction disc 23, and two arc-shaped continuous negative pressure grooves 242 are formed on both sides of the discontinuous negative pressure groove 241. The discontinuous negative pressure groove 241 and the continuous negative pressure groove 242 are both communicated with an external negative pressure device through a conduit. A valve groove 244 for accommodating the rotary valve 25 is formed at a position on the side of the negative pressure connection base 24 away from the annular suction disc 23 and corresponding to the discontinuous negative pressure groove 241. The valve groove 244 is intermittently communicated with the discontinuous negative pressure groove 241 through two valve holes 243. During the rotation of the rotary valve 25, the valve holes 243 are blocked at a certain interval time so that the discontinuous negative pressure groove 241 realizes discontinuous negative pressure. A small gear is mounted at the end of the rotary valve 25, and a large gear is mounted at the end of the first rotating shaft 22. The small gear and the large gear are in meshing transmission with each other.

[0025] As Figures 7 - 10 As shown, the second transfer wheel 4 includes a second mounting base 41. A second rotating shaft 42 is provided on the second mounting base 41, a first suction cup base 43 is provided on the second rotating shaft 42, and a plurality of suction cup assemblies 44 are slidably provided on the first suction cup base 43. A driving wheel 45 is provided on the second mounting base 41, and a driving groove 451 for driving the suction cup assemblies 44 to reciprocate horizontally is formed in the driving wheel 45.

[0026] Specifically, the second mounting base 41 is mounted on the production line of sanitary products in a T shape. It has a long through hole in the middle, and a second rotating shaft 42 is rotatably mounted through a bearing. The second rotating shaft 42 rotates under the drive of an external power mechanism. The first suction cup base 43 is composed of two circular end plates and multiple pin shafts. The two ends of the pin shafts are respectively fixed to the circular end plates, and one of the circular end plates is fixedly connected to the second rotating shaft 42. Multiple suction cup assemblies 44 are slidably mounted on the pin shafts in the first suction cup base 43. The suction cup assembly 44 includes a transverse movement suction cup 441, a transverse movement connecting rod 442, and a transverse movement bearing 3. The transverse movement suction cup 441 is sleeved on the pin shaft and can slide on the pin shaft. One end of the transverse movement connecting rod 442 is fixed to the bottom of the transverse movement suction cup 441, and the other end is fixed to the inner ring of the transverse movement bearing 3. The transverse movement bearing 3 is located in the driving groove 451 and abuts against the side wall of the driving groove. The driving wheel 45 is fixedly sleeved on the second mounting base 41, and a closed S-shaped driving groove 451 is formed on its outer wall. When the transverse movement bearing 3 rotates around the driving groove 451 for one circle, it can push the transverse movement suction cup 441 to reciprocate horizontally once.

[0027] The structure of the first transfer wheel 3 is different from that of the second transfer wheel 4 in that the path direction of the driving groove 451 is different. The path direction of the driving groove 451 in the second transfer wheel 4 and the path direction of the driving groove in the first transfer wheel 3 are in a symmetrically opposite relationship.

[0028] As Figures 11 - 13 shown, the lateral variable pitch wheel 5 includes a main shaft 51. A second suction cup base 52 is rotatably arranged on the main shaft 51. A number of lead screws 531 with opposite threads at the ends are arranged on the second suction cup base 52. Threaded nuts of the lead screws 531 are threadedly connected to both ends of the lead screws 531. An outer suction cup 55 for adsorbing a part of the sheet 71 is arranged on the threaded nut of the lead screw 531 at one end, and an inner suction cup 56 for adsorbing another part of the sheet 71 is arranged on the threaded nut of the lead screw 531 at the other end. A swing arm 533 is arranged at the end of the lead screw 531, and a cam bearing 534 is arranged on the swing arm 533. The lead screw 531, the threaded nut of the lead screw 531, the swing arm 533, and the cam bearing 534 form a lead screw nut assembly 53. A cam disc 54 is arranged at the end of the main shaft 51, and a swing groove 541 for accommodating the cam bearing 534 and then driving the swing arm 533 to swing through the cam bearing 534 is formed on the cam disc 54.

[0029] Specifically, the main shaft 51 is installed in a T-shaped manner on the production line of sanitary products. The second suction cup seat 52 is installed on the main shaft 51 in a sleeved and rotatable manner through a bearing. A gear is installed at the end of the second suction cup seat 52 for transmission with an external power mechanism to achieve rotation around the main shaft 51. The end of the main shaft 51 is installed with a cam disc 54 in a detachable manner through a screw. The left end of the lead screw 531 is installed on the second suction cup seat 52 through a bearing, and its right end is installed with a swing arm 533, and a cam bearing 534 is installed on the swing arm 533; that is, the left end of the lead screw nut assembly 53 formed by the lead screw 531, the lead screw 531 nut, the swing arm 533, and the cam bearing 534 is installed on the second suction cup seat 52, and its right end is installed on the cam disc 54. An inner side of the cam disc 54 facing the cam bearing 534 is provided with a swing groove 541 in the shape of a "pear" and annular as shown in Figure 13 . When the cam bearing 534 is located at the top of the swing groove 541 ( Figure 13 , the T point position in the figure), the lateral distance between the inner suction cup 56 and the outer suction cup 55 is the smallest; when the cam bearing 534 is located at the bottom of the swing groove 541 ( Figure 13 , the L point position in the figure), the lateral distance between the inner suction cup 56 and the outer suction cup 55 is the largest. In actual production, the inner suction cup 56 and the outer suction cup 55 on the same lead screw nut assembly 53 rotate around the main shaft 51 as the axis and reciprocate in opposite directions along the axial direction of the lead screw 531.

[0030] As shown in Figures 14 - 15 , the longitudinal variable pitch wheel 6 includes a third mounting seat 61. A third rotating shaft 62, a fourth rotating shaft 63, a fifth rotating shaft 64, and a sixth rotating shaft 65 are coaxially rotatably arranged on the third mounting seat 61; the fourth rotating shaft 63 is sleeved on the third rotating shaft 62, the fifth rotating shaft 64 is sleeved on the fourth rotating shaft 63, the sixth rotating shaft 65 is sleeved on the fifth rotating shaft 64, and the third mounting seat 61 is sleeved on the sixth rotating shaft 65; two independent driving suction cups 66 are provided on each of the third rotating shaft 62, the fourth rotating shaft 63, the fifth rotating shaft 64, and the sixth rotating shaft 65. One independent driving suction cup 66 is used to adsorb a part of the sheet material 71, and the other independent driving suction cup 66 is used to adsorb another part of the sheet material 71.

[0031] Specifically, the third mounting seat 61 is mounted on the production line of the sanitary product in a T shape. The third mounting seat 61 is sleeved with the sixth rotating shaft 65 in a rotatable manner through a bearing. The sixth rotating shaft 65 is sleeved with the fifth rotating shaft 64 in a rotatable manner through a bearing. The fifth rotating shaft 64 is sleeved with the fourth rotating shaft 63 in a rotatable manner through a bearing. The fourth rotating shaft 63 is sleeved with the third rotating shaft 62 in a rotatable manner through a bearing. Gears for driving by an external independent motor are installed at the left ends of the third rotating shaft 62, the fourth rotating shaft 63, the fifth rotating shaft 64 and the sixth rotating shaft 65. T-shaped suction cup brackets 67 are installed at their right ends. An independent driving suction cup 66 is installed at each end of the suction cup bracket 67.

[0032] Further, the negative pressure adsorption area of the anvil roller 2 is divided into a continuous negative pressure area and an intermittent negative pressure area; the intermittent negative pressure area periodically turns on and off the negative pressure so that part of the sheet 71 is conveyed to the first transfer wheel 3 and the other part of the sheet 71 is conveyed to the second transfer wheel 4.

[0033] Further, a lead screw 531-nut assembly 53 driven by a cam disk 54 is provided on the lateral pitch-changing wheel 5. The lead screw 531-nut assembly 53 drives the outer suction cup 55 and the inner suction cup 56 to move laterally synchronously; the lateral pitch of the sheet 71 is changed by replacing the cam disk 54 with different groove curves.

[0034] Further, the rotation speed of the independent driving suction cup 66 is controlled by an independent driving motor, and the longitudinal pitch of the sheet 71 is changed by adjusting the speed control curve of the independent driving motor.

[0035] Further, when switching to sanitary products of different sizes, the cam disk 54 with corresponding contour grooves is replaced without changing the mechanical structure.

[0036] Based on the composite material belt forming equipment composed of the knife roller 1, the anvil roller 2, the first transfer wheel 3, the second transfer wheel 4, the lateral pitch-changing wheel 5 and the longitudinal pitch-changing wheel 6 with the above specific structures, the forming method of the composite material belt 7 is as follows: (1) The raw material belt 1 (such as ear tape non-woven fabric) is cut by the knife roller 1 and the anvil roller 2 to become segmented sheets 71 (cut into ear tapes). The sheets 71 are arranged staggeredly, and the shapes of adjacent sheets 71 are opposite up and down.

[0037] (2) The anvil roller 2 has a negative pressure adsorption function, and the sheet 71 can be adsorbed by the anvil roller 2 and conveyed to the first transfer wheel 3 and the second transfer wheel 4. Specifically: The negative pressure adsorption area of the anvil roller 2 is divided into two parts. The area where the anvil roller 2 is connected to the first transfer wheel 3 is an intermittent negative pressure area. The area from the connection between the anvil roller 2 and the cutter roller 1 to the connection between the anvil roller 1 and the second transfer wheel 4 is a continuous negative pressure area. The on / off of the negative pressure in the two negative pressure areas can be independently controlled. During normal operation, the continuous negative pressure area keeps the negative pressure on, that is, the anvil roller 2 can stably adsorb the sheet 71 in the continuous negative pressure area; the negative pressure in the intermittent negative pressure area is periodically turned on and off, and the negative pressure is turned off once every other sheet 71. When the negative pressure in the intermittent negative pressure area is turned off, the anvil roller 2 cannot adsorb the sheet 71, and the sheet 71 is adsorbed and transferred by the first transfer wheel 3; when the negative pressure in the intermittent negative pressure area is turned on, the anvil roller 2 always adsorbs the sheet 71 until it is conveyed to the second transfer wheel 4.

[0038] (4) Through the above intermittent negative pressure control, half of the sheets 71 can be conveyed from the anvil roller 2 to the first transfer wheel 3, and the other half of the sheets 71 can be conveyed to the second transfer wheel 4, so that the shapes and directions of the sheets 71 on the first transfer wheel 3 and the second transfer wheel 4 are opposite.

[0039] (5) The first transfer wheel 3 and the second transfer wheel 4 have a negative pressure adsorption function, and the sheet 71 can be adsorbed by the first transfer wheel 3 and the second transfer wheel 4 and conveyed to the lateral pitch-changing wheel 5. Specifically: The first transfer wheel 3 can adsorb the sheet 71 and rotate it for conveyance, and at the same time move laterally outward during the rotation conveyance. The second transfer wheel 4 can adsorb the sheet 71 and rotate it for conveyance, and at the same time move laterally inward during the rotation conveyance. After the sheet 71 is conveyed by the first transfer wheel 3 and the second transfer wheel 4, it is conveyed to the lateral pitch-changing wheel 5. In particular, for the staggered sheets 71, the conveyance distances from being conveyed by the first transfer wheel 3 to the lateral pitch-changing wheel 5 and from being conveyed by the second transfer wheel 4 to the lateral pitch-changing wheel 5 are not equal. By setting an appropriate conveyance distance difference, each pair of sheets 71 can be arranged facing each other on the lateral pitch-changing wheel 5.

[0040] (6) There are several pairs of outer adsorption discs 55 and inner adsorption discs 56 on the lateral pitch-changing wheel 5. The outer adsorption discs 55 can move laterally outward simultaneously when rotating, and the inner adsorption discs 56 can move laterally inward simultaneously when rotating. Specifically: After passing through the connection with the lateral pitch-changing wheel 5, the outer adsorption discs 55 and the inner adsorption discs 56 start to move laterally outward and inward respectively, so that the lateral spacing of the paired sheets 71 reaches the required value.

[0041] (7) A number of independently driven suction discs 66 are coaxially arranged on the longitudinal pitch-changing wheel 6. Two independently driven suction discs 66 form a group, and each group of independently driven suction discs 66 is driven by an independent drive motor, so that independent control of the rotational speed can be achieved. Specifically: at the junction of the transverse pitch-changing wheel 5 and the longitudinal pitch-changing wheel 6, the independently driven suction disc 66 adsorbs the sheet material 71 on the transverse pitch-changing wheel 5 at a relatively low rotational speed. After the adsorption is completed, the rotational speed of the independently driven suction disc 66 increases. When it is in contact with the main material belt 8, the independently driven suction disc 66 rotates at a relatively high rotational speed and releases the sheet material 71, which adheres to the main material belt 8. In practical applications, the main material belt 8 can be a bottom film non-woven fabric. By increasing the rotational speed of the independently driven suction disc 66 when releasing the sheet material 71, the longitudinal distance between the sheet materials 71 can be increased, so that the longitudinal pitch of the sheet materials 71 on the composite material belt 9 reaches the required value.

[0042] As Figures 11 - 13 shown, each outer suction disc 55 and inner suction disc 56 are respectively equipped with a lead screw nut 532. The lead screw nut 532 is driven by a lead screw 531, and the lead screw 531 is driven by a swing arm 533. One end of the swing arm 533 is fixed on the lead screw 531 and can rotate around the axis of the lead screw 531. The other end of the swing arm 533 is installed with a cam bearing 534, and the cam bearing 534 is embedded in the swing groove 541 of the cam disc 54. When the transverse pitch-changing wheel 5 rotates, the cam bearing 534 moves centrifugally or centripetally along the swing groove 541, driving the swing arm 533 to swing, thereby driving the lead screw 531 to rotate, and then driving the outer suction disc 55 and the inner suction disc 56 to move laterally outward and inward respectively. In particular, since the swing angle of the swing arm 533 is small, a large lead screw with left and right hand threads needs to be selected for the lead screw 531.

[0043] The lateral movement distance of the outer suction disc 55 and the inner suction disc 56 is determined by the groove curve of the swing groove 541. By replacing the cam disc 54 with different groove curves, the lateral movement distance of the outer suction disc 55 and the inner suction disc 56 can be changed, thereby changing the lateral pitch of the sheet materials 71 on the composite material belt.

[0044] Generally, disposable sanitary products of different sizes have different requirements for the lateral pitch of the sheet materials 71. Under the forming process provided by the present invention, when producing disposable sanitary products of different sizes, only by replacing the cam disc 54 can the requirement of changing the lateral pitch of the sheet materials 71 be met.

[0045] As Figures 14 - 15 shown, the driving of each group of independently driven suction discs 66 is independent. By changing the speed control curve of its drive motor, the speed when the independently driven suction disc 66 is in contact with the main material belt 8 can be changed, thereby changing the longitudinal pitch of the sheet materials 71 on the composite material belt 9.

[0046] Generally, the requirements for the longitudinal spacing of the sheet 71 are different for disposable sanitary products of different sizes. Under the forming process provided by the present invention, when producing disposable sanitary products of different sizes, only by adjusting the speed control curve of the drive motor of the independently driven suction disc 66 can the longitudinal spacing of the sheet 71 be changed to meet the requirements.

[0047] In summary, the present invention has the following beneficial effects: (1) The present invention provides a forming process for a composite material belt for sanitary products. When only the longitudinal spacing of the sheet 71 needs to be changed for disposable sanitary products of different sizes, the mechanical components of the forming equipment provided by the present invention do not need to be adjusted, and only the drive program needs to be adjusted to cope with the production of different sizes; (2) The present invention provides a forming process for a composite material belt for sanitary products. When disposable sanitary products of different sizes require simultaneous changes in the longitudinal and transverse spacings of the sheet 71, the forming equipment provided by the present invention only needs to replace the cam disc 54 and adjust the control program to cope with the production of different sizes; (3) The cam disc 54 is a planar cam, which is easier to replace and process compared to a cylindrical cam, and has the advantage of low cost; (4) All the rotating mechanisms of the present invention are relatively independent, and the actions performed by each rotating mechanism are relatively simple, making it easier to maintain and having higher operating stability.

[0048] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A composite material strip forming method for sanitary products, characterized in that: The following steps are involved: (1) Cutting the raw material strip roll into segmented sheets by a knife roller and anvil roller, the sheets are staggered and adjacent sheets face opposite directions; (2) A portion of the sheet is conveyed to the transverse pitch-changing wheel via the first transfer wheel through the negative pressure adsorption function of the anvil roller, and this portion of the sheet is moved transversely outward during the conveying process; another portion of the sheet is conveyed to the transverse pitch-changing wheel via the second transfer wheel, and this portion of the sheet is moved transversely inward during the conveying process; (3) On the lateral pitch-variable wheel, the lateral spacing between the paired sheets reaches a preset value through the synchronous lateral movement of the outer suction plate and the inner suction plate; (4) The sheets with adjusted transverse spacing are transported to the longitudinal pitch-variable wheels, and the longitudinal spacing of the paired sheets is adjusted by independently driving the suction plates; (5) The sheets with adjusted longitudinal spacing are bonded to the main material strip to form a composite material strip.

2. The composite material tape forming method according to claim 1, characterized in that: The negative pressure adsorption area of ​​the anvil roller is divided into a continuous negative pressure area and an intermittent negative pressure area; the intermittent negative pressure area periodically switches on and off the negative pressure to allow part of the sheet to be conveyed to the first transfer wheel and another part of the sheet to be conveyed to the second transfer wheel.

3. The composite material tape forming method according to claim 1, characterized in that: A screw nut assembly driven by a cam disc is provided on the lateral pitch-changing wheel, and the screw nut assembly drives the outer adsorption disc and the inner adsorption disc to move synchronously laterally; the lateral spacing of the sheets can be changed by replacing the cam disc with different groove curves.

4. The composite material tape forming method according to claim 1, characterized in that: The rotation speed of the independently driven adsorption plate is controlled by an independently driven motor, and the longitudinal spacing of the sheets is changed by adjusting the speed control curve of the independently driven motor.

5. The composite material tape forming method according to claim 3, characterized in that: When switching between different sizes of sanitary products, the cam disc with the corresponding contour groove can be replaced without changing the mechanical structure.

6. The composite material tape forming method according to claim 2, characterized in that: The anvil roller includes a first mounting seat, a first rotating shaft is provided on the first mounting seat, and an annular adsorption disk is provided on the first rotating shaft; a negative pressure connecting seat is provided on the first mounting seat for providing negative pressure to the annular adsorption disk; an intermittent negative pressure groove corresponding to the intermittent negative pressure area is provided in the negative pressure connecting seat, and a continuous negative pressure groove corresponding to the connected negative pressure area is provided in the negative pressure connecting seat, and the continuous negative pressure groove and the intermittent negative pressure groove are not connected to each other; a rotary valve is rotatably provided on the negative pressure connecting seat for connecting the intermittent negative pressure groove with the negative pressure generating device at intervals, and the rotary valve is meshed with the first rotating shaft for transmission.

7. The composite material tape forming method according to claim 2, characterized in that: The second transfer wheel includes a second mounting seat, a second rotating shaft is provided on the second mounting seat, a first suction cup seat is provided on the second rotating shaft, and a plurality of suction cup assemblies are slidably provided on the first suction cup seat; a driving wheel is provided on the second mounting seat, and a driving groove is provided on the driving wheel for driving the suction cup assembly to move back and forth horizontally.

8. The composite material tape forming method according to claim 3, characterized in that: The lateral pitch-changing wheel includes a main shaft, on which a second suction cup seat is rotatably arranged, on which a plurality of screws with positive and negative teeth at the ends are arranged, and both ends of the screws are threadedly connected with screw nuts, and the screw nut at one end of the screw is provided with an outer suction disk for adsorbing part of the sheet material, and the screw nut at the other end of the screw is provided with an inner suction disk for adsorbing another part of the sheet material, and a swing arm is provided at the end of the screw, and a cam bearing is provided on the swing arm; the screw, the screw nut, the swing arm and the cam bearing form a screw nut assembly; a cam plate is provided at the end of the main shaft, and a swing groove is provided on the cam plate for accommodating the cam bearing and then driving the swing arm to swing through the cam bearing.

9. The composite material tape forming method according to claim 4, characterized in that: The longitudinal pitch-variable wheel includes a third mounting seat, on which a third rotating shaft, a fourth rotating shaft, a fifth rotating shaft and a sixth rotating shaft are coaxially arranged; the fourth rotating shaft is sleeved with the third rotating shaft, the fifth rotating shaft is sleeved with the fourth rotating shaft, the sixth rotating shaft is sleeved with the fifth rotating shaft, and the third mounting seat is sleeved with the sixth rotating shaft; two independently driven adsorption disks are arranged on the third rotating shaft, the fourth rotating shaft, the fifth rotating shaft and the sixth rotating shaft, wherein one independently driven adsorption disk is used for adsorbing part of the sheet material, and the other independently driven adsorption disk is used for adsorbing another part of the sheet material.

10. A composite material strip forming device for sanitary products, characterized in that: A composite material tape is formed by the composite material tape forming method according to any one of claims 1 to 9.

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