CN115584576A - Cotton suction mechanism for non-woven fabric lapping machine - Google Patents

Abstract

The invention discloses a cotton suction mechanism for a non-woven fabric lapping machine, belonging to the technical field of non-woven fabrics, wherein the cotton suction mechanism is arranged on the upper layer of a lapping machine frame and comprises: array cotton suction system, split negative pressure system and biax actuating system. According to the invention, under the conditions of rated negative pressure power and adsorption air volume, the array type cotton suction system can maximally utilize the negative pressure air volume to complete adsorption and capture of the fine cotton wool, namely, each cotton suction port independently captures the fine cotton wool under the rated air volume.

Description

Cotton-absorbing mechanism for non-woven fabric laying machine

technical field

The invention relates to the technical field of nonwoven fabrics, in particular to a cotton suction mechanism for a nonwoven fabric laying machine.

Background technique

Non-woven fabric is a kind of fabric formed without spinning and weaving. It is just oriented or randomly arranged textile staple fibers or filaments to form a web structure, and then reinforced by mechanical, thermal bonding or chemical methods. The production equipment with non-woven fabrics mainly includes an opening machine, a carding machine, a web-laying machine and a needle punching machine. The textile fiber is opened by the opening machine and supplied to the carding machine, and the textile fiber carded by the carding machine is supplied to the web-laying machine. Laying the net, the net laying machine lays the net and then sends it to the needling machine, and finally forms a non-woven fabric product. The web-laying machine is an important part of the complete set of non-woven fabric production equipment. In the production process of non-woven fabrics, the single-layer textile fiber web needs to be laid by the web-laying machine to form a certain thickness of multi-layer textile fibers. The net is then rolled by a hot roller to be fused and bonded into a whole piece of nonwoven fabric. In the process of folding the net-laying machine of the prior art into a net, due to the effects of static electricity, air flow and the net-laying curtain, it is easy to cause the textile fibers to produce cotton fluff when laying the net. The flocculation will block the mechanical components such as the press roller and guide roller of the lapper, which will cause the lapper to fail to work normally and affect the production efficiency and progress. In terms of the solution to this problem, it is currently more common to arrange a suction fan on the upper layer of the frame and a cotton suction pipe arranged vertically along the textile fiber output direction, thereby reclaiming discrete cotton flocs, such as the publication number CN106400309B Chinese invention Patent, although this method of absorbing cotton has a simple structure and low cost, the arrangement of the cotton suction tube increases the negative pressure loss of the suction fan, so that in order to achieve the ideal cleaning effect, the power of the suction fan must be increased, causing the cotton suction tube to Local negative pressure overload (near the side of the suction fan) will easily cause the two ends of the folded fiber web to lift up, affecting the neatness of the fiber web. Therefore, a new cotton suction treatment method is urgently needed. In view of this, we propose a Suction mechanism for nonwoven web lapper.

Contents of the invention

1. Technical problems to be solved

The object of the present invention is to provide a cotton suction mechanism for a nonwoven web laying machine to solve the problems raised in the above-mentioned background technology.

2. Technical solution

A cotton-absorbing mechanism for a nonwoven web-laying machine, the cotton-absorbing mechanism is arranged on the upper layer of a web-laying machine frame, comprising: an array type cotton-absorbing system; wherein, the cotton-absorbing mode of the array-type cotton-absorbing system is Dot-matrix suction; split negative pressure system, which is arranged on the frame of the web-laying machine to connect with the array suction system; biaxial drive system, which is arranged between the array suction system and the split Between the negative pressure systems; wherein, one end of the biaxial drive system is driven in a gap with the array suction system, and the other end of the biaxial drive system is rotationally connected with the split negative pressure system. The invention provides a new cotton-absorbing mechanism for a web-laying machine. Compared with the existing straight-tube continuous cotton-absorbing treatment method, the present invention constructs an array-type cotton-absorbing system, a split-type negative pressure system and a biaxial drive The dot-matrix cotton suction structure composed of the system uses the dual-axis drive system to synchronously drive the array cotton suction system and the split negative pressure system, so that the array cotton suction system can maximize the The adsorption and capture of cotton flocs is completed by using the negative pressure air volume, that is, each suction port can independently capture cotton flocs under the rated air volume. The discrete time of wadding, and the dot-matrix interstitial suction of cotton is conducive to the local and rapid treatment of cotton wadding. On the one hand, it reduces the phenomenon of lifting the folded fiber web when the high-power suction fan is arranged to continuously absorb cotton, and plays the role of energy saving and emission reduction. On the other hand, static elimination treatment is performed on the captured cotton flocs to avoid the greater risk caused by the charge accumulation of cotton fine flocs and the secondary dispersion under the action of static electricity.

Preferably, the array suction system includes at least two suction heads.

Preferably, the cotton suction head includes: a cover body; wherein, an arc-shaped groove is opened on the outer wall of the cover body; a mechanical iris (the mechanical iris structure is an existing structure, including two fixed leaf rings arranged in parallel, arranged on The moving blade ring between the two fixed blade rings and a plurality of overlapping arc-shaped metal blades, the size of the central circular aperture is changed by the clutching of the blades), arranged at the bottom opening of the cover; the diaphragm spring, Pressed in the mechanical iris; wherein, the small end of the diaphragm spring is far away from the mechanical iris to form a hole; the gear ring is arranged in the arc-shaped groove to connect the rotor blade ring of the mechanical iris; the sleeve is threaded Piercing on the gear ring; wherein, one end of the sleeve is in contact with the small end of the diaphragm spring, and the other end of the sleeve extends out of the cover body; and, the sleeve is connected to the cover through the shaft key The body slides linearly; the clockwork spring is sleeved on the outside of the casing; wherein, one end of the clockwork spring is connected and fixed to the surface of the gear ring, and the other end of the clockwork spring is connected and fixed to the inner wall of the casing. When the present invention utilizes the two-axis driving system to drive a plurality of suction heads in gaps, the hole forming of the mechanical iris changes from the expanded state to the closed state (not completely closed). The negative pressure wind force enables the discrete cotton flocs to be quickly captured locally. Compared with the existing cotton suction method, the present invention not only reduces the power of the suction fan that needs to be arranged, but is also conducive to energy saving; When the cotton flocs form holes through suction (small diameter), the contact with the diaphragm spring is improved, which is beneficial to guide the static electricity on the cotton fine flocs to the ground for static elimination treatment, and the tapered diaphragm spring is also conducive to Guide the strands of cotton flocs to improve the passing rate of cotton flocs.

Preferably, the diaphragm spring is connected to the ground through a ground wire. When the diaphragm spring is tapered under normal conditions, it is beneficial to guide the flow of cotton flocs passing through the diaphragm spring and eliminate static electricity; when the diaphragm spring is squeezed by the sleeve to form a flat state, it is beneficial to reduce the blade expansion time. The ventilation volume of the mechanical iris makes most of the negative pressure air volume concentrated on the open suction head.

Preferably, the mechanical iris, the diaphragm spring and the sleeve are located on the same vertical axis, which is conducive to the negative pressure capture of cotton fluff and improves the passing rate of cotton fluff on the array suction system.

Preferably, the split-type negative pressure system includes: a negative pressure main pipe arranged on the frame of the net lapper; wherein, the output end of the negative pressure main pipe communicates with an external suction fan; at least two negative pressure branch pipes are The split structure is arranged at the input end of the negative pressure main pipe; wherein, the number of the negative pressure branch pipes is adapted to the number of cotton suction heads; and, the negative pressure branch pipes are flexibly socketed with the casing; Rotating grooves are provided on the circumference of the branch pipe.

Preferably, the biaxial drive system includes: a biaxial motor, connected and fixed to the cover through a motor base; a driving tooth, sleeved on one end of the biaxial motor; wherein, at least a section of teeth is provided on the circumference of the driving tooth The slot, the tooth slot meshes with the gear ring gap; the ventilation circular plate is sleeved on the other end of the biaxial motor and connected to the rotation slot; wherein, the ventilation circular plate is provided with a through hole corresponding to the position of the tooth slot ; Wherein, the size of the through hole is adapted to the size of the negative pressure branch pipe.

3. Beneficial effect

Compared with the prior art, the present invention has the advantages of:

1. The present invention provides a new cotton-absorbing mechanism for a web-laying machine. Compared with the existing straight-tube overall continuous cotton-absorbing treatment method, the present invention constructs an array-type cotton-absorbing system, a split-type negative pressure system and a double The dot-matrix cotton suction structure composed of the shaft drive system uses the dual-axis drive system to synchronously drive the array cotton suction system and the split negative pressure system, so that under the conditions of rated negative pressure power and adsorption air volume, the array cotton suction system can Maximize the use of negative pressure air volume to complete the adsorption and capture of cotton flocs, that is, each suction port can independently capture cotton flocs under the rated air volume. The discrete time of cotton flocs, and the dot-matrix interstitial cotton suction is conducive to the local and rapid treatment of cotton fine fluffs. On the one hand, it reduces the phenomenon of lifting the folded fiber web when arranging a high-power suction fan to continuously suck cotton, which plays a role in energy saving and emission reduction. On the other hand, the electrostatic elimination treatment is carried out on the captured cotton flocs to avoid the greater risk caused by the charge accumulation of cotton fine flocs and the secondary dispersion under the action of static electricity.

2. When the present invention utilizes the two-axis drive system to drive a plurality of suction heads in gaps, the hole forming of the mechanical iris changes from the expanded state to the closed state (not completely closed). At this time, under the condition of the rated negative pressure air volume, the hole forming The size affects the negative pressure wind force, so that the discrete cotton flocs can be quickly captured locally. Compared with the existing cotton suction method, the present invention not only reduces the power of the suction fan that needs to be arranged, but is also conducive to energy saving; on the other hand, it makes strands When the adsorbed cotton flocs form holes through suction (small diameter), the contact with the diaphragm spring is improved, which is beneficial to guide the static electricity on the cotton fine flocs to the ground for static elimination treatment, and the tapered diaphragm spring is also It is beneficial to guide the strands of cotton flocs and improve the passing rate of cotton flocs.

Description of drawings

Fig. 1 is a schematic top view of the overall structure of the present invention;

Fig. 2 is a schematic bottom view of the overall structure of the present invention;

Fig. 3 is a schematic diagram of the connection structure between the suction head and the driving teeth in the present invention;

Fig. 4 is the structural representation of split type negative pressure system among the present invention;

Fig. 5 is the structural representation of cotton suction head among the present invention;

Fig. 6 is a schematic plan view of part of the structure of the cotton suction head in the present invention;

Fig. 7 is a schematic bottom view of part of the structure of the cotton suction head in the present invention;

Fig. 8 is a schematic diagram of the first embodiment of the tooth groove and the through hole in the present invention;

Fig. 9 is a schematic diagram of the second implementation of the tooth groove and the through hole in the present invention;

Fig. 10 is a schematic diagram of the third implementation of the tooth groove and the through hole in the present invention;

Explanation of symbols in the figure: 1. Array type suction system; 2. Split negative pressure system; 3. Dual-axis drive system;

11. Cotton suction head;

111, cover body; 112, mechanical iris; 113, diaphragm spring; 114, gear ring; 115, casing; 116, clockwork spring;

1111, arc groove;

21. Negative pressure main pipe; 22. Negative pressure branch pipe;

221, rotating groove;

31. Two-axis motor; 32. Driving teeth; 33. Ventilation circular plate;

321. alveolar;

331. Through holes.

detailed description

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the invention.

In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

Referring to Fig. 1 to Fig. 10, the present invention provides a technical solution:

A cotton-absorbing mechanism for a nonwoven web-laying machine, the cotton-absorbing mechanism is arranged on the upper layer of a web-laying machine frame, comprising: an array type cotton-absorbing system 1; wherein, the cotton-absorbing mode of the array-type cotton-absorbing system 1 is a dot matrix Type suction; split negative pressure system 2, which is arranged on the frame of the net lapper and connected with the array type suction system 1; biaxial drive system 3, arranged between the array type suction system 1 and the split type negative pressure system 2 ; Among them, one end of the biaxial drive system 3 is driven in a gap with the arrayed cotton suction system 1, and the other end of the biaxial drive system 3 is rotationally connected with the split negative pressure system 2. The invention provides a new cotton-absorbing mechanism for a web-laying machine. Compared with the existing straight-pipe overall continuous cotton-absorbing treatment method, the present invention constructs an array-type cotton-absorbing system 1, a split-type negative pressure system 2 and a double The dot-matrix cotton suction structure composed of the shaft drive system 3 uses the dual-axis drive system 3 to synchronously drive the array cotton suction system 1 and the split negative pressure system 2, so that under the conditions of rated negative pressure power and adsorption air volume, the array type Cotton suction system 1 can maximize the use of negative pressure air volume to complete the adsorption and capture of cotton flocs, that is, each suction port can independently capture cotton flocs under the rated air volume, compared with the existing straight-pipe overall continuous cotton suction processing method , the present invention not only gives discrete time to the cotton flocs, but also the dot-matrix interstitial cotton suction is conducive to the local rapid treatment of the cotton flocs, on the one hand, it reduces the phenomenon of lifting the folded fiber web when a large-power suction fan is arranged to continuously suck cotton, It plays the role of energy saving and emission reduction. On the other hand, it performs static elimination treatment on the captured cotton flocs to avoid the greater risk caused by the accumulation of cotton fine flocs and the secondary dispersion under the action of static electricity.

Specifically, the array suction system 1 includes at least two suction heads 11 . As shown in FIG. 1 and FIG. 2 , the present invention uses four cotton suction heads 11 arranged in a rectangular array to describe the technical solution in detail.

Among them, for the convenience of understanding, as shown in Fig. 3, Fig. 5 to Fig. 7, the present invention also discloses a more specific structural diagram of the cotton suction head 11, the cotton suction head 11 includes: a cover body 111; wherein, the outer wall of the cover body 111 is An arc-shaped groove 1111 is provided; a mechanical iris 112 (the structure of the mechanical iris is an existing structure, including two fixed leaf rings arranged in parallel, a movable leaf ring arranged between the two fixed leaf rings, and a plurality of overlapping arc-shaped Composed of metal blades, the size of the central circular aperture is changed by the clutch of the blades), arranged at the bottom opening of the cover body 111; the diaphragm spring 113 is pressed in the mechanical iris 112; wherein, the small end of the diaphragm spring 113 is far away from the mechanical The iris 112 is formed into a hole; the gear ring 114 is arranged in the arc groove 1111 and connected to the rotor blade ring of the mechanical iris 112; the sleeve 115 is threaded on the gear ring 114; wherein, one end of the sleeve 115 is small to the diaphragm spring 113 The head end contacts, and the other end of the sleeve 115 passes through the cover body 111 and extends to the outside; and, the sleeve 115 slides linearly with the cover body 111 through the shaft key, and when the biaxial drive system 3 drives the gear ring 114 to rotate, the gear ring 114 drives The moving blade ring in the mechanical iris 112 rotates. At this time, a plurality of metal blades are mutually clutched to change the size of the hole. Under the action of position, a lifting movement occurs, "rising" corresponds to the "closing" of the mechanical iris 112, and "falling" corresponds to the "leaving" of the mechanical iris 112; the clockwork spring 116 is sleeved on the outside of the casing 115; wherein, the clockwork spring One end of 116 is connected and fixed with the surface of gear ring 114, and the other end of clockwork spring 116 is connected and fixed with the inner wall of cover body 111, which is conducive to the reset of gear ring 114 after rotation. When the present invention utilizes the two-axis drive system 3 to drive a plurality of suction heads 11 in gaps, the hole forming of the mechanical iris 112 changes from the expanded state to the closed state (not completely closed), and at this time, under the condition of the rated negative pressure air volume, the hole is formed The magnitude of the negative pressure influences the wind force, so that the discrete cotton wadding can be quickly captured locally. Compared with the existing cotton suction method, the present invention not only reduces the power of the suction fan that needs to be arranged, but is also conducive to energy saving; When the cotton fine wadding absorbed by the strands passes through the cotton to form a hole (small diameter), the contact with the diaphragm spring 113 is improved, which is beneficial to guide the static electricity on the cotton wadding to the ground for static elimination treatment, and the tapered diaphragm The spring 113 is also conducive to guiding the fine cotton flocs in strands to improve the passing rate of the fine cotton flocs.

It should be noted that the diaphragm spring 113 is connected to the ground through a ground wire. When the diaphragm spring 113 is tapered under normal conditions, it is conducive to the circulation guidance and static elimination treatment of the cotton flocs passing through the diaphragm spring 113; Reduce the ventilation volume of the mechanical iris 112 when the blades expand, so that most of the negative pressure air volume is concentrated on the opened cotton suction head 11 .

It is worth noting that the mechanical iris 112, the diaphragm spring 113 and the sleeve 115 are located on the same vertical axis, which is beneficial to the negative pressure capture of the cotton fluff and improves the passing rate of the cotton fluff on the array suction system 1.

Among them, for the convenience of understanding, as shown in Figure 4, the present invention also discloses a more specific structural schematic diagram of the split negative pressure system 2, the split negative pressure system 2 includes: a negative pressure main pipe 21, which is arranged by a conventional fixed installation pipeline It can be placed on the frame of the net-laying machine; wherein, the output end of the negative pressure main pipe 21 is connected with the external suction fan; at least two negative pressure branch pipes 22 are arranged at the input end of the negative pressure main pipe 21 in a split structure; wherein, the negative pressure branch pipe 22 The number is adapted to the number of suction heads 11; and, the negative pressure branch pipe 22 is movably socketed with the sleeve pipe 115; In the present invention, four cotton suction heads 11 are taken as an example to illustrate the details of the technical solution. Of course, the number of negative pressure branch pipes 22 matches the number of cotton suction heads 11. As shown in Figure 2, when there is a cotton suction head 11 tending to When closing, all the other three returned to the normal state (expanded state) under the restoring force of clockwork spring 116. At this moment, the suction head 11 which tended to be closed and the negative pressure branch pipe 22 and negative pressure main pipe 21 formed suction cotton channel to complete the local cotton-absorbing process of the web-laying machine, and the cotton-absorbing heads 11 under the other three normal states are for the gap of the structure when the cotton-absorbing channel is in the disconnected state (in a connected state) (the structural gap refers to the above-mentioned The gap between the arranged cotton suction structures) provides the possibility of air intake, on the one hand avoids the damage caused by the excessive negative pressure of the suction fan, and on the other hand makes the three suction heads 11 under normal conditions still provide weaker airflow (relative to For the suction head 11 in the passage state) to attract discrete cotton fluff, when the corresponding cotton suction head 11 is in the passage state, it can complete the local fast cotton suction process.

Among them, for the convenience of understanding, as shown in Fig. 3, Fig. 8 to Fig. 10, the present invention also discloses a more specific structural diagram of the biaxial drive system 3, the biaxial drive system 3 includes: a biaxial motor 31, through the motor base and The cover body 111 is connected and fixed; the drive tooth 32 is sleeved on one end of the biaxial motor 31; wherein, at least one segment of the tooth groove 321 is provided on the circumference of the drive tooth 32, taking the four cotton suction heads 11 in the present invention as an example, at this time The radian of the tooth groove 321 is a quarter arc, and the tooth groove 321 is engaged with the gear ring 114 in clearance; the ventilation circular plate 33 is sleeved on the other end of the biaxial motor 31 and connected to the rotation groove 221; wherein, the ventilation circular plate 33 is provided with The through hole 331 corresponding to the position of the tooth groove 321; wherein, the size of the through hole 331 is adapted to the size of the negative pressure branch pipe 22. When the through hole 331 intersects with the suction channel, it is the passage state of the channel. When the through hole 331 and When the suction channels do not intersect, it is the disconnected state of the channel.

In order to arrange the cotton suction mode according to the actual production situation, in one embodiment, as shown in Figure 8, the tooth groove 321 is an independent section, at this time, the number of through holes 331 is only In the environment, it means that the four suction heads 11 are independently switched on and off in a circular gap, that is, when one suction head 11 performs local suction of cotton with high air flow in the state of the suction channel, the other three suction heads 11 maintain low air flow adsorption state.

In order to arrange the cotton suction method according to the actual production situation, in one embodiment, as shown in Figure 9, the tooth groove 321 is two consecutive sections, at this time, the number of through holes 331 is two side by side, that is, in the current four suction heads In the implementation environment of 11, it means that the four suction heads 11 are continuous two-by-two suction cotton, that is, when the two suction heads 11 perform local suction of cotton with high air flow in the state of the suction channel passage, the remaining two suction heads 11 11 Maintain a low airflow adsorption state.

In order to arrange the cotton suction method according to the actual production situation, in one embodiment, as shown in Figure 10, the tooth groove 321 is two sections of the gap. In the implementation environment of 11, it means that the four cotton suction heads 11 are continuous two-two symmetrical cotton suction, that is, when the two suction heads 11 perform local suction of cotton with high air flow in the state of the suction channel passage, the remaining two suction heads 11 11 Maintain a low airflow adsorption state.

To sum up, in order to improve the efficiency of cotton absorption, there are many implementation situations for elaboration, those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions are only preferred examples of the present invention. Examples are not used to limit the present invention. On the premise of not departing from the spirit and scope of the present invention, there will be various changes and improvements in the present invention, and these changes and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A cotton-absorbing mechanism for a nonwoven web-laying machine, said cotton-absorbing mechanism being arranged on the upper stratum of a web-laying machine frame, is characterized in that, comprising: Array suction system (1); Wherein, the cotton suction mode of the array type suction system (1) is lattice suction; A split negative pressure system (2), arranged on the frame of the web lapper and connected to the arrayed cotton suction system (1); A biaxial drive system (3), arranged between the array type cotton suction system (1) and the split type negative pressure system (2); Wherein, one end of the biaxial drive system (3) is driven in a gap with the array type cotton suction system (1), and the other end of the biaxial drive system (3) is rotationally connected with the split negative pressure system (2) . 2. The cotton suction mechanism for a nonwoven web laying machine according to claim 1, characterized in that, the array type suction system (1) comprises at least two suction heads (11). 3. The cotton-absorbing mechanism for a nonwoven web-laying machine according to claim 2, wherein the cotton-absorbing head (11) comprises: Cover body (111); Wherein, arc-shaped grooves (1111) are provided on the peripheral outer wall of the cover body (111); a mechanical iris (112), arranged at the bottom opening of the cover (111); Diaphragm spring (113), pressed in the mechanical iris (112); Wherein, the small end of the diaphragm spring (113) forms a hole away from the mechanical iris (112); A toothed ring (114), arranged in the arc-shaped groove (1111) to connect the moving blade ring of the mechanical iris (112); Sleeve (115), threaded on the gear ring (114); Wherein, one end of the sleeve (115) is in contact with the small end of the diaphragm spring (113), and the other end of the sleeve (115) passes through the cover (111) and extends to the outside; And, the sleeve (115) slides linearly with the cover (111) through the shaft key; A clockwork spring (116), sleeved on the outside of the sleeve (115); Wherein, one end of the clockwork spring (116) is connected and fixed to the surface of the gear ring (114), and the other end of the clockwork spring (116) is connected and fixed to the inner wall of the cover body (111). 4 . The cotton suction mechanism for a nonwoven web laying machine according to claim 3 , wherein the diaphragm spring ( 113 ) is connected to the ground through a grounding wire. 5 . 5. The cotton-absorbing mechanism for a nonwoven web lapper according to claim 3, wherein the mechanical iris (112), the diaphragm spring (113) and the sleeve (115) are located in the same vertical axis. 6. The cotton-absorbing mechanism for a nonwoven web-laying machine according to claim 3, wherein the split negative pressure system (2) comprises: The negative pressure main pipe (21) is arranged on the frame of the net lapper; Wherein, the output end of the negative pressure main pipe (21) is communicated with an external suction fan; At least two negative pressure branch pipes (22) are arranged in a split structure at the input end of the negative pressure main pipe (21); Wherein, the quantity of the negative pressure branch pipe (22) is adapted to the quantity of the cotton suction head (11); And, the negative pressure branch pipe (22) is flexibly socketed with the sleeve pipe (115); Moreover, a rotation groove (221) is opened on the circumference of the negative pressure branch pipe (22). 7. The cotton suction mechanism for a nonwoven web laying machine according to claim 6, wherein the biaxial drive system (3) comprises: The biaxial motor (31) is connected and fixed with the cover body (111) through the motor seat; The driving gear (32) is socketed on one end of the biaxial motor (31); Wherein, at least one tooth groove (321) is provided on the circumference of the driving tooth (32), and the tooth groove (321) is in clearance engagement with the gear ring (114); A ventilating circular plate (33), socketed on the other end of the biaxial motor (31) and connected to the rotating slot (221); Wherein, the ventilation circular plate (33) is provided with a through hole (331) corresponding to the position of the tooth groove (321); Wherein, the size of the through hole (331) is adapted to the size of the negative pressure branch pipe (22).

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