A web stretcher and a method of adjusting the web stretcher

Abstract

The application discloses a web laying machine web draft adjusting mechanism and a method for adjusting the same, which utilizes traction rollers, power units and draft rods to make the web laying machine leather curtain move at a uniform acceleration in the horizontal direction, so that the fiber web on the web laying machine leather curtain is stretched and pulled at all times, so that a wave-shaped structure is formed between the fiber web layers, and a vertically changing fiber gap is generated, the vertically changing fiber gap exhibits capillary effect, the propagation speed of water and air in the vertically changing fiber gap is improved, and the moisture permeability and air permeability of the fiber web are improved; the draft rods crosswise adjust the traction rollers, the tightness between the fiber web layers is crosswise arranged, the interlayer stress between the layers can be offset, the stress on each position of the fiber web layers is more uniform, local stress concentration is reduced, an overall superposition effect is formed, a coupling effect between the fiber web layers is generated, the overall strength of the fiber web is improved, and the fiber web has stronger mechanical properties.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laying machine adjustment, and particularly relates to a laying machine web draft adjustment mechanism and a method for adjusting the same. BACKGROUND

[0002] Non-woven fabric is a kind of fiber material which is not made by weaving and knitting, but is formed by bonding fiber materials together through chemical, hot pressing or mechanical methods. Non-woven fabric has the characteristics of good air permeability, high strength, wear resistance, waterproofness, anti-static and the like, and is applied in many fields. The web cross-laying machine is a device for producing web non-woven fabric, which forms a layered material by cross-laying cotton fibers together, and forms non-woven fabric material through hot pressing treatment or chemical treatment and the like.

[0003] In the material laying process of the non-woven fabric laying machine, in order to ensure the product quality and ensure that the non-woven fabric material can be uniformly laid, the draft mechanism needs to be set, which can control the width, thickness and weight of the non-woven fabric in the laying process, reduce the adjustment time, improve the production efficiency, reduce the material loss and save the raw material cost.

[0004] The prior art CN109750416A discloses a laying machine web draft adjustment mechanism and a laying machine. The cotton web supply, the adjustment member, and the cotton web conveying member are provided. The cotton web is conveyed from the cotton web supply to the cotton web conveying member through the adjustment member. The adjustment member is perpendicular to the conveying direction of the cotton web and periodically moves along the direction. The cotton web is clamped by the adjustment member and is periodically drafted with the adjustment member. The cotton web is thinned in a certain length through the draft, so that the thickness of the laid product is uniform. However, in the draft adjustment process, the fiber web is uniformly stacked too much, and the layers are too close to each other, which leads to the consistency of the structure of the non-woven fabric fiber web, hinders the circulation of water and air, and reduces the air permeability and moisture absorption and drainage of the non-woven fabric.

[0005] Therefore, it is necessary to improve the non-woven fabric laying machine draft adjustment mechanism in the prior art to solve the above problems. SUMMARY

[0006] The present application overcomes the shortcomings of the prior art, and provides a laying machine web draft adjustment mechanism and a method for adjusting the same, which aims to solve the defect of poor moisture permeability caused by the laying machine draft adjustment mechanism in the prior art.

[0007] To achieve the above object, the technical scheme adopted by the present application is as follows: a laying machine web draft adjustment mechanism, comprising: a rack, a laying trolley arranged on the rack, a plurality of traction rollers arranged on both sides of the laying trolley, and a draft unit arranged between the plurality of traction rollers.

[0008] The trolley traction mechanism is arranged on the trolley and drives the trolley to move horizontally and linearly.

[0009] The traction rollers are arranged at two ends of the trolley in the moving direction, the axes of the traction rollers are arranged in parallel and on the same horizontal plane, the upper surfaces of the traction rollers are tangent to the lower surface of the trolley, and the axes of the traction rollers are perpendicular to the moving direction of the trolley.

[0010] The drawing unit comprises a power unit and a plurality of drawing rods arranged on the power unit, the power unit is fixedly connected with the frame, the power unit drives the plurality of drawing rods to move horizontally and uniformly accelerate, each drawing rod is rotatably connected with one end of the traction roller, and the horizontal moving direction of the drawing rods is parallel to the trolley.

[0011] In a preferred embodiment of the present application, a sliding block is fixedly arranged on one end of each traction roller, the sliding block is slidingly connected with the frame, and the moving direction of the sliding block is parallel to the trolley.

[0012] In a preferred embodiment of the present application, the power unit is located on the perpendicular bisector of the adjacent traction rollers at two ends of the trolley.

[0013] In a preferred embodiment of the present application, the lengths of the plurality of drawing rods are the same.

[0014] In a preferred embodiment of the present application, the connecting point of the drawing rod and the traction roller is coaxially arranged with the traction roller.

[0015] In a preferred embodiment of the present application, the moving planes of the adjacent drawing rods are distributed in layers, and the plurality of drawing rods are located on the same vertical plane.

[0016] In a preferred embodiment of the present application, a sensor is arranged on the trolley, and the sensor is used to detect the moving speed and direction of the trolley.

[0017] To achieve the above-mentioned purpose, a second set of technical solutions adopted by the present application is a method for adjusting the cotton web drawing adjustment mechanism of a web laying machine, based on a cotton web drawing adjustment mechanism of a web laying machine, comprising the following steps:

[0018] S1: starting the trolley traction mechanism, the trolley traction mechanism drives the trolley to move horizontally and linearly;

[0019] S2: a plurality of leather curtains passing through the trolley and the traction rollers respectively are laid respectively under the horizontal movement of the trolley;

[0020] S3: the power unit controls one of the stretching rods to move horizontally and linearly, when the laying trolley starts to move, one of the stretching rods on one side of the laying trolley moves horizontally and linearly, and the linear motion direction of the stretching rod is opposite to the moving direction of the laying trolley;

[0021] S4: when the laying trolley in the S3 starts to move reversely, the stretching rod in the S3 also starts to move reversely until returning to the original position.

[0022] In a preferred embodiment of the present application, the stretching rod in the S3 moves at a gradually increasing speed, and the motion acceleration time of the stretching rod is the same as the motion time of the laying trolley.

[0023] In a preferred embodiment of the present application, the adjacent stretching rods move reversely at the same acceleration.

[0024] The present application solves the defects in the background art, and has the following beneficial effects:

[0025] (1) The present application provides a laying machine web stretching adjustment mechanism and an adjustment method thereof, which utilizes traction rollers, power units and stretching rods to make the laying machine apron move uniformly and accelerate in the horizontal direction, so that the fiber web on the laying machine apron is stretched and pulled at all times, and the tightness of the fiber web changes at all times. Compared with the laying machine stretching adjustment mechanism in the prior art, the change in the tightness of the fiber web can make the fiber web layer structure form a wave structure, and generate uniformly changing vertical fiber gaps. The vertical fiber gaps exhibit capillary effect, improve the propagation speed of water and air in the vertical fiber gaps, improve the moisture and air permeability of the fiber web, and solve the defects of poor air permeability and moisture permeability caused by the laying machine stretching adjustment mechanism in the prior art.

[0026] (2) In the present application, each stretching rod controls the traction roller and the laying trolley to move uniformly and accelerate in opposite directions, and the adjacent stretching rods move in opposite directions and at the same acceleration, so that the laying machine apron is pulled with increasing force, and the tightness of each layer of fiber web changes uniformly and gradually. Compared with the prior art, the overall thickness of the fiber web can be made consistent, the tightness on the same side of the layers can be made different, and the tightness in the middle of the layers can be made consistent, while ensuring the overall structure of the fiber web. The fiber web forms a three-dimensional grid channel, exhibits anisotropy, can form staggered channels, and improves the propagation of air and moisture.

[0027] (3) In the present application, the drawing rod crosswise adjusts the drawing roller, the tightness of the fiber web layers is crosswise arranged, when the layers are close to each other, the interlayer stress between the layers can be offset, the interlayer shear stress is reduced, compared with the prior art, the force on each position of the fiber web layer is more uniform, the local stress concentration is reduced, the stress accumulation is dispersed, the overall superposition effect is formed, the coupling effect between the fiber web layers is generated, the overall strength of the fiber web is improved, and the fiber web has stronger mechanical properties. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0029] Figure 1 is a plan view of the preferred embodiment of the present application;

[0030] Figure 2 is a method step diagram of the preferred embodiment of the present application;

[0031] In the drawings: 100, laying cart; 200, drawing roller; 300, drawing unit; 310, power unit; 320, drawing rod. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0035] In the description of the present application, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0036] As shown in Figure 1 A wire laying machine wire net stretching adjusting mechanism, comprising: a rack, a laying trolley 100 arranged on the rack, a plurality of traction rollers 200 arranged on both sides of the laying trolley 100, and a stretching unit 300 arranged between the plurality of traction rollers 200.

[0037] A trolley traction mechanism is fixedly arranged on the laying trolley 100, which drives the laying trolley 100 to move horizontally and linearly. The trolley traction mechanism provides power for the movement of the laying trolley 100 and controls the direction, so that the laying trolley 100 can continuously move horizontally and linearly. The power providing mode of the trolley traction mechanism can be wire traction, crossbar traction, gear driving and the like. A guide rail is arranged on the rack, and the laying trolley 100 is clamped with the guide rail and moves along the guide rail.

[0038] A plurality of traction rollers 200 are arranged at two ends of the laying trolley 100 in the movement direction, the axes of the plurality of traction rollers 200 are arranged in parallel and are located on the same horizontal plane, the upper surfaces of the plurality of traction rollers 200 are tangent to the lower surface of the laying trolley 100, and the axes of the plurality of traction rollers 200 are perpendicular to the straight line in the movement direction of the laying trolley 100. The laying trolley 100 and the traction rollers 200 are used for tensioning and supporting the laying machine skin curtain, the cross skin curtain is separated after passing through the laying trolley 100 and is wound on the traction rollers 200 on both sides of the laying trolley 100 respectively, and the cross skin curtain is stretched in the reverse direction after being separated.

[0039] The drafting unit 300 comprises a power unit 310 and a plurality of drafting rods 320 arranged on the power unit 310. The power unit 310 is fixedly connected with the rack, and drives the plurality of drafting rods 320 to move horizontally and uniformly accelerate. Each drafting rod 320 is rotationally connected with one end of a traction roller 200, and the horizontal movement direction of the plurality of drafting rods 320 is parallel to the laying trolley 100. The power unit 310 can be a pneumatic cylinder or a servo motor, and the traction roller 200 can be driven by the pneumatic cylinder or the motor, so that the traction roller 200 moves horizontally and linearly.

[0040] The traction roller 200, the power unit 310 and the drafting rod 320 are used to make the laying machine skin curtain move horizontally and uniformly accelerate, so that the fiber web on the laying machine skin curtain is stretched and pulled at all times, the tightness of the fiber web changes at all times, and the change in the tightness of the fiber web can cause the wave-shaped structure between the layered structures of the fiber web and the uniformly changing vertical fiber gap. The vertical fiber gap exhibits capillary effect, improves the propagation speed of water and air in the vertical fiber gap, improves the moisture permeability and air permeability of the fiber web, and solves the defects of poor air permeability and moisture permeability caused by the laying process of the laying machine drafting adjustment mechanism in the prior art.

[0041] A sliding block is fixedly arranged at one end of each traction roller 200, the sliding block is slidingly connected with the rack, and the movement direction of the sliding block is parallel to the laying trolley 100. The sliding block supports and moves the medium of the traction roller 200, so that the traction roller 200 slides under the support, the traction roller 200 always remains horizontal, the horizontal nature of the laying machine skin curtain is ensured, the laying machine skin curtain remains horizontal under the premise that the traction roller 200 can move, and the fiber web on the laying machine skin curtain remains flat when stacked.

[0042] The power unit 310 is located on the vertical bisector of the adjacent traction roller 200 at both ends of the laying trolley 100, and the lengths of the plurality of draft bars 320 are the same. When the plurality of draft bars 320 controls the plurality of traction rollers 200 respectively, the distance and motion parameters of the control motion are the same, which can ensure the consistency and symmetry of the draft bar 320 when controlling the traction roller 200, so that the whole fiber web under the draft adjustment is uniform.

[0043] The connection point of the draft bar 320 and the traction roller 200 is coaxially arranged with the traction roller 200. The traction roller 200 and the laying machine apron are in contact connection, and the traction roller 200 and the draft bar 320 are respectively rotatably connected with the sliding block, so that the draft bar 320 controls the motion of the traction roller 200 while the rotation of the traction roller 200 remains horizontal, thereby maintaining the horizontality of the laying machine apron.

[0044] The motion planes of the adjacent draft bars 320 are distributed in layers, and the plurality of draft bars 320 are located in the same vertical plane. The adjacent draft bars 320 are arranged at the upper end and the lower end of the power unit 310 respectively, and the extension directions are opposite, and the control directions of the traction roller 200 are opposite.

[0045] The laying trolley 100 is provided with a sensor, and the sensor is used for detecting the motion speed and direction of the laying trolley 100. The sensor can be an optical sensor, an electrical sensor and a contact sensor, etc. The motion of the laying trolley 100 is collected and transmitted, so that the draft bar 320 can be adjusted according to the motion state of the laying trolley 100.

[0046] As shown in Figure 2 To achieve the above purpose, the second technical scheme adopted by the present application is a laying machine web draft adjustment mechanism adjustment method based on a laying machine web draft adjustment mechanism, comprising the following steps:

[0047] S1: starting the trolley traction mechanism, the trolley traction mechanism drives the laying trolley 100 to move horizontally and linearly;

[0048] S2: a plurality of aprons passing through the laying trolley 100 and the plurality of traction rollers 200 respectively are laid under the horizontal motion of the laying trolley 100;

[0049] S3: the power unit 310 controls one draft bar 320 to move horizontally and linearly, and the draft bar 320 on one side of the laying trolley 100 moves horizontally and linearly when the laying trolley 100 starts to move, and the linear motion direction of the draft bar 320 is opposite to the motion direction of the laying trolley 100;

[0050] S4: when the laying trolley 100 in S3 starts to move reversely, the draft bar 320 in S3 also starts to move reversely until it returns to the original position.

[0051] Each drawing rod 320 controls the traction roller 200 and the laying trolley 100 to move in the opposite direction at a uniform acceleration, and the adjacent drawing rods 320 move in the opposite direction at the same acceleration, so that the laying machine skin curtain is pulled at a continuously increasing force, the tightness of each layer of fiber web changes uniformly in gradient, which can make the overall thickness of the fiber web consistent, the tightness difference on the same side between layers is large, the tightness in the middle between layers is consistent, while ensuring the overall structure of the fiber web, the fiber web forms a three-dimensional grid channel, anisotropy is generated, and staggered channels are formed to improve the propagation of air and moisture.

[0052] The drawing rod 320 in S3 moves at a gradually increasing speed, and the acceleration time of the drawing rod 320 is the same as the movement time of the laying trolley 100. The drawing rod 320 moves at a uniform acceleration, so that the tightness of the laying machine skin curtain changes with time, which promotes the generation of fiber web gradient change.

[0053] The adjacent drawing rods 320 move in the opposite direction at the same acceleration. The opposite uniform acceleration movement can make the fiber web move in the opposite gradient when the laying trolley 100 moves to each side, ensuring that the overall gradient is consistent.

[0054] The drawing rod 320 adjusts the traction of the traction roller 200 in a staggered manner, and the tightness between the layers of the fiber web is staggered. When the layers are in close contact, the interlayer stress between the layers can be offset, the interlayer shear stress can be reduced, the stress at each position on the fiber web layer can be more uniform, the local stress concentration can be reduced, the stress accumulation can be dispersed, the overall superposition effect can be formed, the coupling effect between the fiber web layers can be generated, the overall strength of the fiber web can be improved, and the fiber web has stronger mechanical properties.

[0055] When the drawing rod 320 adjusts the traction of the traction roller 200, the horizontal movement acceleration of the traction roller 200 is 0.1m / s 2 -0.3m / s 2 . The uniform acceleration movement of the traction roller 200 is related to the movement distance of the laying trolley 100. The greater the movement distance of the laying trolley 100, the greater the acceleration value of the traction roller 200. During the movement of the traction roller 200, the gradient change is more obvious, and the performance of the fiber web is improved.

[0056] Embodiment one

[0057] The embodiment discloses a method for adjusting the drawing rod of a laying machine web, and the steps are as follows:

[0058] S1: Start the trolley traction mechanism, and drive the laying trolley 100 to move horizontally and linearly.

[0059] S2: a plurality of belts respectively passing through the laying trolley 100 and the plurality of traction rollers 200 are laid under the horizontal movement of the laying trolley 100;

[0060] S3: the power unit 310 controls one stretching rod 320 to perform horizontal linear motion, when the laying trolley 100 starts to move, one side of the stretching rod 320 performs horizontal linear motion, the linear motion direction of the stretching rod 320 is opposite to the movement direction of the laying trolley 100, the stretching rod 320 drives the traction roller 200 to perform uniform acceleration motion with an acceleration of 0.1 m / s 2 ;

[0061] S4: when the laying trolley 100 in S3 starts to move reversely, the stretching rod 320 in S3 also starts to move reversely until returning to the original position, and a cotton fiber web with a thickness of 3 mm is obtained.

[0062] Example Two

[0063] The embodiment discloses a method for adjusting a cotton web stretching adjusting mechanism of a laying machine, and the steps are as follows:

[0064] S1: start the trolley traction mechanism, and the trolley traction mechanism drives the laying trolley 100 to perform horizontal linear motion;

[0065] S2: a plurality of belts respectively passing through the laying trolley 100 and the plurality of traction rollers 200 are laid under the horizontal movement of the laying trolley 100;

[0066] S3: the power unit 310 controls one stretching rod 320 to perform horizontal linear motion, when the laying trolley 100 starts to move, one side of the stretching rod 320 performs horizontal linear motion, the linear motion direction of the stretching rod 320 is opposite to the movement direction of the laying trolley 100, the stretching rod 320 drives the traction roller 200 to perform uniform acceleration motion with an acceleration of 0.15 m / s 2 ;

[0067] S4: when the laying trolley 100 in S3 starts to move reversely, the stretching rod 320 in S3 also starts to move reversely until returning to the original position, and a cotton fiber web with a thickness of 3 mm is obtained.

[0068] Example Three

[0069] The embodiment discloses a method for adjusting a cotton web stretching adjusting mechanism of a laying machine, and the steps are as follows:

[0070] S1: start the trolley traction mechanism, and the trolley traction mechanism drives the laying trolley 100 to perform horizontal linear motion;

[0071] S2: several leather belts respectively passing through the laying trolley 100 and several traction rollers 200 are laid respectively under the horizontal movement of the laying trolley 100;

[0072] S3: the power unit 310 controls one stretching rod 320 to perform horizontal linear motion, when the laying trolley 100 starts to move, one side of the stretching rod 320 performs horizontal linear motion, the linear motion direction of the stretching rod 320 is opposite to the movement direction of the laying trolley 100, the stretching rod 320 drives the traction roller 200 to perform uniform acceleration motion with an acceleration of 0.2 m / s 2 ;

[0073] S4: when the laying trolley 100 in S3 starts to move reversely, the stretching rod 320 in S3 also starts to move reversely until returning to the original position, and a cotton fiber web with a thickness of 3 mm is obtained.

[0074] Example Four

[0075] The embodiment discloses a method for adjusting a cotton web stretching adjusting mechanism of a laying machine, and the steps are as follows:

[0076] S1: start the trolley traction mechanism, and the trolley traction mechanism drives the laying trolley 100 to perform horizontal linear motion;

[0077] S2: several leather belts respectively passing through the laying trolley 100 and several traction rollers 200 are laid respectively under the horizontal movement of the laying trolley 100;

[0078] S3: the power unit 310 controls one stretching rod 320 to perform horizontal linear motion, when the laying trolley 100 starts to move, one side of the stretching rod 320 performs horizontal linear motion, the linear motion direction of the stretching rod 320 is opposite to the movement direction of the laying trolley 100, the stretching rod 320 drives the traction roller 200 to perform uniform acceleration motion with an acceleration of 0.25 m / s 2 ;

[0079] S4: when the laying trolley 100 in S3 starts to move reversely, the stretching rod 320 in S3 also starts to move reversely until returning to the original position, and a cotton fiber web with a thickness of 3 mm is obtained.

[0080] Example Five

[0081] The embodiment discloses a method for adjusting a cotton web stretching adjusting mechanism of a laying machine, and the steps are as follows:

[0082] S1: start the trolley traction mechanism, and the trolley traction mechanism drives the laying trolley 100 to perform horizontal linear motion;

[0083] S2: the several leather curtains respectively passing through the laying trolley 100 and the several traction rollers 200 are laid respectively under the horizontal movement of the laying trolley 100;

[0084] S3: the power unit 310 controls one stretching rod 320 to perform horizontal linear movement, the stretching rod 320 on one side of the laying trolley 100 starts to perform horizontal linear movement when the laying trolley 100 starts to move, the linear movement direction of the stretching rod 320 is opposite to the movement direction of the laying trolley 100, the stretching rod 320 drives the traction roller 200 to perform uniform acceleration movement with an acceleration of 0.3m / s 2

[0085] S4: when the laying trolley 100 in S3 starts to move reversely, the stretching rod 320 in S3 also starts to move reversely until returning to the original position, and the cotton fiber web with a thickness of 3mm is obtained.

[0086] Comparative Example One

[0087] The cotton fiber web is laid by using the cross-laying machine, and the cotton fiber web with a thickness of 3mm is obtained.

[0088] The cotton fiber webs in Examples One to Five and Comparative Example One are cut to obtain samples with a length and width of 10cm, the samples are placed in a constant temperature and humidity box with a temperature of 25℃ and a relative humidity of 50% for 4h, the humidity sensor is used to detect the humidity before and after the samples are placed in the constant temperature and humidity box, and the moisture permeability values are obtained, as shown in Table 1.

[0089] Table 1: Moisture permeability values of Examples One to Five and Comparative Example One

[0090] Sample origin moisture permeability value (g / m 2 ·h) Example one 76.4 Example two 77.2 Example three 78.3 Example four 79.1 Example five 80.5 Comparative example one Comparative example two 56.9

[0091] The moisture permeability values in Examples One to Five are all greater than the moisture permeability value in the comparative example, and the greater the acceleration of the traction roller 200, the higher the moisture permeability value of the sample, the better the moisture permeability, and the stretching adjustment method for the cotton fiber web can improve the moisture permeability of the cotton fiber web.

[0092] The above is based on the ideal embodiment of the application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the contents in the specification, and the technical scope must be determined according to the scope of claims.​

Claims

1. A web stretching adjustment mechanism for a web laying machine, comprising: A rack, a laying trolley (100) arranged on the rack, a plurality of traction rollers (200) arranged on both sides of the laying trolley (100), and a drafting unit (300) arranged between the plurality of traction rollers (200), characterized in that: The laying trolley (100) is fixedly provided with a trolley traction mechanism, which drives the laying trolley (100) to move horizontally and linearly; One end of each traction roller (200) is fixedly provided with a sliding block, which is slidingly connected with the rack, and the movement direction of the sliding block is parallel to the laying trolley (100); The plurality of traction rollers (200) are arranged on both ends of the movement direction of the laying trolley (100), the axes of the plurality of traction rollers (200) are arranged in parallel and on the same horizontal plane, the upper surfaces of the plurality of traction rollers (200) are tangent to the lower surface of the laying trolley (100), and the axes of the plurality of traction rollers (200) are perpendicular to the movement direction of the laying trolley (100). The drafting unit (300) comprises a power unit (310) and a plurality of drafting rods (320) arranged on the power unit (310); the power unit (310) is fixedly connected with the rack, and drives the plurality of drafting rods (320) to move horizontally and uniformly accelerate; each drafting rod (320) is rotatably connected with one end of the traction roller (200); and the movement direction of the plurality of drafting rods (320) is parallel to the laying trolley (100).

2. The web stretching adjustment mechanism for a web laying machine according to claim 1, characterized in that: The power unit (310) is located on the perpendicular bisector of the adjacent traction rollers (200) at both ends of the laying trolley (100).

3. A web former sheet web draw regulation mechanism according to claim 1 wherein: The lengths of the plurality of drafting rods (320) are the same.

4. A web former sheet web draw regulation mechanism according to claim 1 wherein: The connection points of the drafting rods (320) and the traction rollers (200) are coaxially arranged with the traction rollers (200).

5. A web former sheet web draw regulation mechanism according to claim 1 wherein: The movement planes of adjacent drafting rods (320) are distributed in layers, and the plurality of drafting rods (320) are located on the same vertical plane.

6. A web former sheet web draw regulation mechanism according to claim 1 wherein: A sensor is arranged on the laying trolley (100), and the sensor is used to detect the movement speed and direction of the laying trolley (100).

7. A method of adjusting a web felt draft adjusting mechanism of a web former, based on a web felt draft adjusting mechanism according to any one of claims 1 to 6, characterized in that The method comprises the following steps: S1: starting the trolley traction mechanism, which drives the laying trolley (100) to move horizontally and linearly; S2: a plurality of leather curtains passing through the laying trolley (100) and the plurality of traction rollers (200) are laid respectively under the horizontal movement of the laying trolley (100); S3: the power unit (310) controls one of the drafting rods (320) to move horizontally and linearly, and the drafting rod (320) on one side of the laying trolley (100) moves horizontally and linearly when the laying trolley (100) starts to move, and the linear movement direction of the drafting rod (320) is opposite to the movement direction of the laying trolley (100). S4: When the laying trolley (100) in S3 starts to move reversely, the drawing rod (320) in S3 also starts to move reversely until returning to the original position.

8. A method of adjusting a web-formation draft mechanism of a web-laying machine according to claim 7, characterized in that: The drawing rod (320) in S3 moves at a gradually increasing speed, and the acceleration time of the drawing rod (320) is the same as the moving time of the laying trolley (100).

9. A method of adjusting a web-formation draft mechanism of a web-laying machine according to claim 8, characterized in that: The adjacent drawing rods (320) respectively move reversely at the same acceleration.

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