Method for manufacturing a twisted elastic waist string and forming device thereof

Abstract

The application discloses a manufacturing method and a forming device of a twisted elastic waist rope. A yarn spindle is arranged on a braiding machine; a pitch braiding device comprises a circular ring, a supporting circular tube and a reversing wheel, the supporting circular tube is fixed to the braiding machine, and the circular ring and the reversing wheel are located on the two sides of the supporting circular tube; a stretching device is located below the reversing wheel and is used for stretching elastic rods; a twisting device comprises a first twisting part close to the braiding machine and a second twisting part away from the braiding machine, a first mounting seat supporting the first twisting part and a second mounting seat supporting the second twisting part, the first twisting part and the second twisting part are oppositely arranged, and the twisting directions of the first twisting part and the second twisting part are opposite; a traction device is located between the braiding machine and the twisting device, and a braided rope braided at the braiding machine is pulled by the traction device to move towards the twisting device; and an electric control device comprises a first electric control assembly arranged at the traction device and a second electric control assembly arranged at the twisting device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rope equipment, and particularly relates to a manufacturing method of a twisted and braided integrated elastic waist rope and a forming device thereof. BACKGROUND

[0002] In the application process of the tarpaulin, the elastic waist rope is a good supplement to the tarpaulin. The effect of the elastic waist rope is to fix the tarpaulin, so that the tarpaulin can better play its effect. Correct use of the elastic waist rope can tighten the rope when the goods sink, so as to prevent the tarpaulin ring from loosening.

[0003] The description of the manufacturing method of the elastic waist rope in the national railway industry standard TB / T 1941-2013 is as follows:

[0004] The elastic waist rope is composed of an elastic part and a main rope. The elastic part is composed of a rubber rod and a braided rope sleeve, and each elastic waist rope has two elastic parts. The main rope includes a middle part (the rope between the two elastic parts) and two end parts (the rope away from the rope head of the two elastic parts). The braided rope sleeve of the elastic part and the middle part of the main rope are made by braiding, and the two end parts of the main rope are made by twisting.

[0005] At present, the manufacturing process flow of the rope is as follows:

[0006] (1) Melt extrusion process: the materials of the elastic rope, polypropylene and polyethylene, are proportioned according to the formula, plasticized by a drawing machine, stretched by a drawing machine, and collected into spindles by a collecting machine;

[0007] (2) Twisting process: the spindles are placed on a rope combining machine to twist the single filaments into spindles;

[0008] (3) Pre-weaving and braiding process: the twisted spindles are reversed into small spindles for the braiding machine by a reversing machine, and then the reversed spindles are woven and collected according to the specifications of the elastic rope;

[0009] (4) The braided rope is cut according to the size, and then the collected parts at both ends of the braided rope are twisted and twisted;

[0010] (5) Two elastic rods are respectively inserted into the positions 2m away from the two end rope heads, and the braided rope is compressed around the elastic rods; the ropes at both ends of the elastic rods are respectively stretched out of the braided rope, and are connected into a whole with the main body of the waist rope by a horseshoe buckle; at the same time, the elasticity of the braided rope sleeve of the elastic part should ensure that the rubber rod is stretched by 300mm and is stressed by the braided rope sleeve.

[0011] According to the test data described in the "Test Analysis of Truck Tarpaulin and Rope Net under Strong Wind Conditions", the D-type tarpaulin rope has damage and appears to be frayed due to friction. Each D-type tarpaulin has 7 elastic ropes, and in the third test, the non-elastic ropes of the tarpaulin of 2 vehicles were broken by friction; among the 6 vehicles using elastic ropes, 5 vehicles had 10 elastic ropes that were pulled out, 2 vehicles had 2 elastic ropes whose rubber rods were broken, and only 1 vehicle had no damage to the elastic ropes.

[0012] In view of the above feedback in combination with the current traditional manufacturing process, it is not difficult to see that the elastic waist rope with the twisting and braiding integrated structure has the following defects in the production process:

[0013] (1) The selection of rope raw materials has room for improvement to improve the external friction resistance of the rope, especially the elastic part of the elastic waist rope.

[0014] (2) The combination method between the elastic rod and the braided rope sleeve adopts the method of "braiding first and then sleeving", which may cause the elastic rod of the elastic waist rope to be pulled out or broken during the stress process; the reason is that the friction between the elastic rod and the braided rope sleeve is not enough, so that only the elastic rod bears most of the tension, and further causes the main stress point to be the horse shoe buckle part.

[0015] (3) In the twisting and twisting process of the take-up portion at both ends of the braided rope, the existing manufacturing process has a large process instability problem with large process parameter deviation; which leads to the problem that the twisted portion at both ends of the elastic waist rope is easy to loosen and has low utilization rate. SUMMARY

[0016] In view of the above shortcomings, the present application provides a manufacturing method and forming device for an elastic waist rope with a twisting and braiding integrated structure, which combines multiple materials for the rope yarn, innovates the forming process of the elastic part and the twisted segment, so that the elastic waist rope has more durable and stable physical properties.

[0017] The present application is realized by the following technical solutions:

[0018] A manufacturing method for an elastic waist rope with a twisting and braiding integrated structure, the manufacturing method comprising:

[0019] S1: composite, ply, and twist polyolefin monofilament bundle and polyester industrial filament or polyester industrial filament bundle to obtain twisted rope yarn required for the elastic waist rope;

[0020] S2: parallel the twisted rope yarn in S1 to obtain the main body segment of the elastic waist rope and the pre-woven rope yarn required for the braided sheath in the elastic part of the elastic waist rope;

[0021] S3: install the pre-woven cord yarn in S2 on the braiding machine, and sequentially complete the following steps:

[0022] S31: complete the first cord yarn traction of the non-yarn spindle rotation;

[0023] S32: complete the first braiding and traction of the braiding sheath with the yarn spindle rotation and the braiding density processing, and the elastic rod is braided inside the braiding sheath;

[0024] S33: complete the braiding and traction of the main body section of the yarn spindle rotation;

[0025] S34: complete the second braiding and traction of the braiding sheath with the yarn spindle rotation and the braiding density processing, and the elastic rod is braided inside the braiding sheath;

[0026] S35: complete the second cord yarn traction of the non-yarn spindle rotation, and finally obtain the main body section of the elastic waist rope and the elastic parts on both sides of the main body section;

[0027] S4: fix the two ends of the rope obtained in S3 on the twisting device respectively to form the twisting section in the main body section on the outside of each elastic part, then pull out the tying rope at both ends of each elastic rod from the braiding sheath, and tie the tying rope with the twisting section to obtain the elastic waist rope.

[0028] Further, the twist direction of the twisted cord yarn in S1 is S twist direction and Z twist direction, and the number of the pre-woven cord yarns in S2 with S twist direction and Z twist direction is the same.

[0029] Further, in step S3, the elastic rod in S32 is stretched and then passively and uniformly input into the braiding sheath; in step S3, the elastic rod in S34 is stretched and then passively and uniformly input into the braiding sheath.

[0030] The application also discloses a twisting and braiding integrated elastic waist rope forming device, which comprises a braiding machine, a pitch and density processing device, a stretching device, a twisting device, a traction device and an electric control device, and a yarn spindle is arranged on the braiding machine; the pitch and density processing device comprises a circular ring, a supporting circular tube and a reversing wheel, the supporting circular tube is fixed on the braiding machine, and the circular ring and the reversing wheel are located on the two sides of the supporting circular tube; the stretching device is located below the reversing wheel and is used for stretching the elastic rod; the twisting device comprises a first twisting part close to the braiding machine and a second twisting part away from the braiding machine, and a first mounting seat supporting the first twisting part and a second mounting seat supporting the second twisting part, the first twisting part and the second twisting part are oppositely arranged, and the twisting directions of the first twisting part and the second twisting part are opposite; the traction device is located between the braiding machine and the twisting device, and the braided rope braided on the braiding machine is pulled by the traction device to move towards the twisting device; and the electric control device comprises a first electric control assembly arranged on the traction device and a second electric control assembly arranged on the twisting device.

[0031] Further, the twisting device further comprises a first sliding rail supporting the first mounting base and the second mounting base, the second mounting base being movable along the extension direction of the first sliding rail to move the second twisting member closer to or farther away from the first twisting member.

[0032] Further, the twisting device further comprises a first air claw assembly located at one side of the first twisting member and a second air claw assembly located at one side of the second twisting member, the first air claw assembly and the second air claw assembly being capable of clamping the braided rope between the first twisting member and the second twisting member to offset the twist contraction of the braided rope during twisting.

[0033] Further, the first air claw assembly comprises a first air claw member and a first support base supporting the first air claw member, the first air claw member being movable along the first support base, the second air claw assembly comprises a second air claw member and a second support base supporting the second air claw member, the second air claw member being movable along the second support base; the twisting device further comprises a support platform supporting the first support base and the second support base.

[0034] Further, the first air claw assembly further comprises a first connecting rod penetrating through the first air claw member and abutting against the first support base, the first connecting rod being sleeved with a first elastic member; the second air claw assembly further comprises a second connecting rod penetrating through the second air claw member and abutting against the second support base, the second connecting rod being sleeved with a second elastic member.

[0035] Further, the braided rope has a first twisting section connected with the first twisting member and a second twisting section connected with the second twisting member; the first twisting member is provided with three first fixing hooks in the circumferential direction, and the first twisting section is divided into three bundles and fixed at the first fixing hooks in sequence; the second twisting member is provided with three second fixing hooks in the circumferential direction, and the second twisting section is divided into three bundles and fixed at the first fixing hooks in sequence.

[0036] Further, the upper end of the reversing wheel is located 6-8mm below the center of the supporting circular tube.

[0037] The present application has at least the following beneficial effects:

[0038] (1) The present application adopts polyolefin monofilament bundle and polyester industrial filament (bundle) for material compounding, and utilizes the excellent tensile and friction resistance of the polyester industrial filament, whether the compounding is "bundle and bundle" in parallel structure or "bundle and single yarn" in skin-core structure, the external friction resistance of the elastic waist rope can be greatly improved, thereby solving the problem of the rope not being resistant to reciprocating friction under stress.

[0039] (2) The application adopts a horizontal braiding machine with yarn spindle rotating device and traction device controlled separately to complete the production of the elastic part of the elastic waist rope, and the stretched elastic rod is over-densely braided by reducing the traction speed of the traction device; not only the requirement of the standard TB / T 1941-2013 is met, i.e. the braided sheath with a length of 90 cm is compressed on the outer surface of the elastic rod with a length of 40 cm, but also the cohesion between the elastic rod and the outer braided sheath is greatly improved, thereby increasing the friction therebetween, achieving the purpose that the elastic rod and the outer braided sheath are simultaneously stressed, and solving the problem that the elastic rod bears most of the tension and the main stress point is the stirrup part under the stress state.

[0040] (3) The application adopts the twisting device to complete the twisting forming of the two end parts of the elastic waist rope, and the rope strand and the rope are synchronously and reversely twisted by the same power source, which not only ensures the stability and consistency of the rope twist and the strand twist of the elastic waist rope in the batch production process, but also realizes the hardness adjustment of the twisted part of the elastic waist rope applied to different positions, thereby improving the use durability and stability of the elastic waist rope. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 Structure schematic view for explaining one illustrative embodiment of the forming device in the application;

[0042] Figure 2 Rear view schematic view for explaining one illustrative embodiment of the braiding machine in the application;

[0043] Figure 3 Top view schematic view for explaining one illustrative embodiment of the twisting device in the application;

[0044] Figure 4 Structure schematic view for explaining one illustrative embodiment of the first twisting member in the application;

[0045] Figure 5 Structure schematic view for explaining one illustrative embodiment of the first air claw assembly in the application.

[0046] REFERENCE SIGNS:

[0047] 1, braiding machine, 11, yarn spindle, 2, pitch compacting device, 21, circular ring, 22, supporting circular tube, 23, reversing wheel, 3, stretching device, 4, twisting device, 41, first twisting member, 411, first fixed hook, 42, second twisting member, 421, second fixed hook, 43, first mounting seat, 44, second mounting seat, 45, first sliding way, 46, first air claw assembly, 461, first air claw member, 462, first supporting seat, 463, first connecting rod, 464, first elastic member, 47, second air claw assembly, 5, traction device. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] It should be noted that the directional terms such as left, right, up, down, front, and back in the embodiments of the present invention are only relative concepts or are based on the normal use state of the product, i.e., the direction of the product's movement, and should not be considered as limiting.

[0050] In addition, it should be noted that the dynamic terms such as "relative motion" mentioned in the embodiments of the present invention refer not only to changes in position, but also to movements such as rotation and rolling in which the position does not change relative to the position, but the state changes.

[0051] Finally, it should be noted that when a component is said to be "located on" or "set on" another component, it can be on the other component or may have an intervening component at the same time. When a component is said to be "connected to" another component, it can be directly connected to the other component or may have an intervening component at the same time.

[0052] like Figures 1 to 5 The diagram shows a forming device for an integrated twisted elastic waist cord. The forming device includes a braiding machine 1, a pitch-dense device 2, a stretching device 3, a twisting device 4, a traction device 5, and an electrical control device. A spindle 11 is installed on the braiding machine 1. The pitch-dense device 2 includes a ring 21, a support tube 22, and a reversing wheel 23. The support tube 22 is fixed to the braiding machine 1, and the ring 21 and the reversing wheel 23 are located on either side of the support tube 22. The stretching device 3 is located below the reversing wheel 23 and is used to stretch the elastic bar. The twisting device 4 includes a first twisting component 4 adjacent to the braiding machine 1. The device includes a first mounting base 43 supporting the first twisting member 41 and a second mounting base 44 supporting the second twisting member 42, the first twisting member 41 and the second twisting member 42 being arranged facing each other and twisting in opposite directions; a traction device 5 is located between the braiding machine 1 and the twisting device 4, the braided rope at the braiding machine 1 is pulled by the traction device 5 to move toward the twisting device 4; the electrical control device includes a first electrical control component disposed at the traction device 5 and a second electrical control component disposed at the twisting device 4.

[0053] The traction device 5 is used for traction of the rope, and the traction device 5 is located between the braiding machine 1 and the twisting device 4, that is, the traction device 5 is located on the side of the braiding machine 1 in the rope out direction; in order to improve the accuracy and convenience in the process of rope traction, the braiding machine 1 adopts a horizontal structure, and in order to improve the accuracy of the pitch of the rope and the length of each part formed, the traction device 5 adopts a track type traction, and the braiding machine 1 and the traction device 5 are controlled separately, so that the braiding machine 1 and the traction device 5 do not interfere with each other.

[0054] The support circular pipe 22 in the pitch compacting device 2 is fixed at the braiding machine 1, and the support circular pipe 22 is located at the center of the braiding machine 1, wherein the support circular pipe 22 is used to provide a conveying channel when the elastic rod is braided into the braided sheath, especially when the two ends of the elastic rod are in a stress-free state, and the support circular pipe 22 also provides a mounting position for the circular ring 21, thereby realizing the compacting processing of the braided sheath on the outside.

[0055] Among them, the circular ring 21 and the reversing wheel 23 are located on both sides of the support circular pipe 22, and in order to ensure the stability of the conveying state of the elastic rod in the stressed state, the reversing wheel 23 is installed on the rear side of the support circular pipe 22, and the circular ring 21 is located on the front side of the circular ring 21, so that the elastic rod moves from the support circular pipe 22 to the circular ring 21, and the stretching device 3 is located on the lower side of the reversing wheel 23, and the gravity of the stretching device 3 itself can be converted into tension along the extension direction of the elastic rod through the reversing wheel 23.

[0056] As a preferred embodiment in the present application, the stretching device 3 is a weight, and the weight is connected with the tether on one side of the elastic rod by knotting, realizing the passive input of constant tension of the elastic rod in the stretched state.

[0057] And after the action of the braiding machine 1, the pitch compacting device 2 and the stretching device 3, the intermediate section in the elastic waist rope and the elastic parts located on both sides of the intermediate section have been formed, and the twisted sections after forming are located on the outside of the two elastic parts, so that the twisted sections will be processed at the beginning and end stages of processing, but not yet formed, and the part to be processed will be moved towards the twisting device 4 by the traction device 5, and the part on the outside of the elastic part will be twisted and processed at the twisting device 4, thereby realizing the formation of the twisted section.

[0058] Specifically, the twisting device 4 comprises a first twisting member 41 close to the braiding machine 1 and a second twisting member 42 away from the braiding machine 1, and a first mounting base 43 supporting the first twisting member 41 and a second mounting base 44 supporting the second twisting member 42, the first twisting member 41 and the second twisting member 42 are oppositely arranged, and the twisting directions of the first twisting member 41 and the second twisting member 42 are opposite. Since both ends of the elastic waist rope are twisting sections, the first twisting member 41 and the second twisting member 42 can simultaneously twist the two ends of the braided rope formed by the braiding machine 1, thereby forming the twisting section.

[0059] In the present application, the twisting device 4 further comprises a first sliding channel 45 supporting the first mounting base 43 and the second mounting base 44, the second mounting base 44 can move along the extension direction of the first sliding channel 45 to make the second twisting member 42 approach or move away from the first twisting member 41; the second mounting base 44 is used to support the second twisting member 42, and the second twisting member 42 is arranged away from the braiding machine 1, so that the braided rope can be kept in tension state after being pulled out by the traction device 5 through the movement of the second mounting base 44.

[0060] Meanwhile, in order to ensure that the same elastic waist rope is not hindered when the end of the braided rope pulled out by the traction device 5 is connected to the second twisting member 42 and pulled by the second twisting member 42 during the processing process, preferably, the first mounting base 43 corresponding to the first twisting member 41 can move in the left-right direction, i.e. in the direction perpendicular to the extension direction of the first sliding channel 45. When the braided rope is pulled by the second twisting member 42, the first twisting member 41 can form an interlacing with the braided rope, thereby avoiding affecting the movement of the braided rope, and when the end of the braided rope corresponds to the first twisting member 41, the first twisting member 41 can be reset to the original position.

[0061] As an embodiment in the present application, the twisting device 4 further comprises a first air claw assembly 46 on one side of the first twisting member 41 and a second air claw assembly 47 on one side of the second twisting member 42, the first air claw assembly 46 and the second air claw assembly 47 can clamp the braided rope between the first twisting member 41 and the second twisting member 42 to offset the twist shrinkage of the braided rope during twisting. The twist shrinkage refers to the length of the braided rope in the axial direction after twisting is shorter than that before twisting. Through the first air claw assembly 46 and the second air claw assembly 47, the length of the braided rope after twisting can be avoided to be shortened when the two ends of the braided rope are twisted.

[0062] Preferably, the first pneumatic gripper assembly 46 includes a first pneumatic gripper 461 and a first support seat 462 supporting the first pneumatic gripper 461. The first pneumatic gripper 461 can move along the first support seat 462. The second pneumatic gripper assembly 47 includes a second pneumatic gripper and a second support seat supporting the second pneumatic gripper. The second pneumatic gripper can move along the second support seat. The twisting device 4 also includes a support platform supporting the first support seat 462 and the second support seat. When the braided rope twists during the twisting process, the length of the braided rope will shorten. The first pneumatic gripper 461 and the second pneumatic gripper are the parts that clamp the braided rope. Therefore, both the first pneumatic gripper 461 and the second pneumatic gripper can move. When twisting occurs, the first pneumatic gripper 461 and the second pneumatic gripper can be moved to increase the difficulty of twisting the braided rope and avoid twisting. At the same time, the first pneumatic gripper 461 and the second pneumatic gripper can move, which can also prevent the braided rope from being clamped too tightly.

[0063] Preferably, the first pneumatic gripper assembly 46 further includes a first connecting rod 463 passing through the first pneumatic gripper 461 and abutting against the first support base 462, and the first connecting rod 463 is fitted with a first elastic element 464; the second pneumatic gripper assembly 47 further includes a second connecting rod passing through the second pneumatic gripper and abutting against the second support base, and the second connecting rod is fitted with a second elastic element; when the first pneumatic gripper 461 and the second pneumatic gripper move, they move along the first connecting rod 463 and the second connecting rod respectively, and the first elastic element 464 and the second elastic element are respectively fitted at the first connecting rod 463 and the second connecting rod. Therefore, when twisting occurs, the first pneumatic gripper 461 and the second pneumatic gripper can be driven to move, avoiding excessive clamping of the braided rope. During the movement, the first elastic element 464 and the second elastic element will both deform, so that the first pneumatic gripper 461 and the second pneumatic gripper can be reset, thereby keeping the length of the braided rope stable.

[0064] As one embodiment of this application, the braided rope has a first twisted section connected to the first twisting member 41 and a second twisted section connected to the second twisting member 42; the first twisting member 41 is provided with three first fixing hooks 411 along the circumference, and the first twisted section is divided into three bundles and fixed to the first fixing hooks 411 in sequence; the second twisting member 42 is provided with three second fixing hooks 421 along the circumference, and the second twisted section is divided into three bundles and fixed to the first fixing hooks 411 in sequence; after the first twisted section is twisted, it will form a twisted section located outside the elastic part. Similarly, after the second twisted section is twisted, it will also form a twisted section located outside the elastic part. At the same time, the second twisted section is a structure away from the braiding machine 1. Therefore, after the braided rope is moved out by the traction device 5, it can be fixed at the second twisting member 42 through the second twisted section, thereby realizing that the second twisting member 42 and the traction device 5 jointly drive the braided rope to move.

[0065] As an embodiment in the application, the upper end of the reversing wheel 23 is located 6-8 mm below the center of the supporting circular tube 22; when the tensioning device 3 pulls the elastic rod in the supporting circular tube 22 through the reversing wheel 23, the force on both sides of the elastic rod is more uniform, and the weaving effect is better.

[0066] The application further provides a manufacturing method of the twisted elastic waist rope.

[0067] S1: the polyolefin monofilament bundle is compounded, plied and twisted with the polyester industrial filament or the polyester industrial filament bundle to obtain the twisted rope yarn required by the elastic waist rope;

[0068] S2: the twisted rope yarn in S1 is plied and pre-woven to obtain the main body section of the elastic waist rope and the pre-woven rope yarn required by the woven sheath in the elastic part of the elastic waist rope;

[0069] S3: the pre-woven rope yarn in S2 is installed on a weaving machine, and the following steps are sequentially completed:

[0070] S31: first rope yarn traction of no spindle rotation is completed;

[0071] S32: first weaving and traction of the woven sheath with yarn spindle rotation and with tight weaving treatment are completed, and the elastic rod is woven in the inside of the woven sheath;

[0072] S33: weaving and traction of the main body section with yarn spindle rotation are completed;

[0073] S34: second weaving and traction of the woven sheath with yarn spindle rotation and with tight weaving treatment are completed, and the elastic rod is woven in the inside of the woven sheath;

[0074] S35: second rope yarn traction of no spindle rotation is completed, and finally the main body section of the elastic waist rope and the elastic parts on both sides of the main body section are obtained;

[0075] S4: the two ends of the rope obtained in S3 are respectively fixed on a twisting device to form the twisting section in the main body section on the outside of each elastic part, then the lanyard at both ends of each elastic rod is pulled out from the woven sheath and integrated with the twisting section, and thus the elastic waist rope is obtained.

[0076] As an embodiment in the application, the twist direction of the twisted rope yarn in S1 is S twist direction and Z twist direction, and the number of the pre-woven rope yarns in S2 with S twist direction and Z twist direction is the same.

[0077] As an embodiment in the application, in step S3, the elastic rod in S32 is passively and uniformly input into the woven sheath after being stretched; in step S3, the elastic rod in S34 is passively and uniformly input into the woven sheath after being stretched.

[0078] The following will be described in detail with a specific manufacturing process as an example

[0079] Example One

[0080] The main rope in this embodiment adopts single-spindle single-strand twill 24 weaving structure, including the following steps:

[0081] Step 1: composite and twist the polyolefin monofilament bundle with a specification of "3 roots*(0.25-0.255)g / m" and 7 polyester industrial filaments with a single yarn specification of 1000Den to obtain the twisted rope yarn required for the elastic waist rope; in order to improve the wear resistance of the elastic waist rope, the process scheme of this forming process is set as follows:

[0082] (1) The weight proportion of HDPE in the polyolefin monofilament is 50%-70%;

[0083] (2) The appearance form of the single yarn in the polyolefin monofilament bundle is flat yarn;

[0084] (3) The composite step of the polyolefin monofilament bundle and the polyester industrial filament is first composite and then twist;

[0085] (4) The composite mode of the polyolefin monofilament bundle and the polyester industrial filament is a skin-core structure, and the 3 polyolefin monofilament bundles are covered by the 7 polyester industrial filaments as the outer skin layer;

[0086] (5) In the twisting process, in order to ensure the stability of the skin-core structure, the tension of the polyolefin monofilament bundle is greater than that of the polyester industrial filament;

[0087] (6) In the twisting process, the twist is set to 60-80TPM; the twist direction is set to positive.

[0088] Step 2: composite and pre-weave the twisted rope yarn obtained by step 1 on the pre-weaving machine to obtain the pre-weaving rope yarn required for the main body section of the elastic waist rope and the woven sheath of the elastic part.

[0089] Step 3: install the pre-weaving rope yarn obtained by step 2 on the 24-spindle horizontal weaving machine, and sequentially complete the following operations:

[0090] (1) complete the first rope yarn traction of the no-yarn spindle rotation, and the length is 2.3-2.5M, so as to form the part to be twisted;

[0091] (2) the first knitting and traction of the elastic section with yarn spindle rotation and tight knitting processing, the knitting pitch is 23-30 mm; and in this process, the first elastic rod is stretched to 55-60 cm under the action of the stretching device; at the same time, in order to prevent the slip of the two ends of the elastic rod and the leakage of the elastic rod, the length of the transition area between the elastic part and the inside starting point of the part to be twisted is 30-40 cm;

[0092] (3) the knitting and traction of the main body section with yarn spindle rotation and normal pitch, the knitting pitch is 70-90 mm, and the length is 5.4-5.6 m;

[0093] (4) the second knitting and traction of the elastic section on the other side with yarn spindle rotation and tight knitting processing, the knitting pitch is 23-30 mm; and in this process, the second elastic rod is stretched to 55-60 cm under the action of the stretching device; similarly, in order to prevent the slip of the two ends of the elastic rod and the leakage of the elastic rod, the length of the transition area between the elastic section on the other side and the inside starting point of the part to be twisted is 30-40 cm;

[0094] (5) the second yarn traction without yarn spindle rotation, the length is 2.3-2.5 m.

[0095] Step 4: install the two ends of the knitted rope prepared in step 3 on the twisting device respectively, complete the twisting section on the outside of each elastic part, then pull out the two ends of the elastic rod from the knitted sheath, and tie the corresponding knitted sheath with a horseshoe buckle to form a whole, thereby preparing the elastic waist rope with a twisting and knitting integrated structure.

[0096] When the twisting process is completed by one-step method, the process flow is as follows:

[0097] (1) move the second twisting member horizontally to the rope outlet of the traction device through the control system;

[0098] (2) when the "yarn bundle without yarn spindle rotation" prepared in step 3.1, i.e. the part to be twisted, is pulled to the rope outlet by the traction device, the head end is divided into three separate bundles (each bundle contains 8 twisted rope yarns), and then fixed on any one of the second fixed hooks in the second twisting member at the same time;

[0099] (3) through the control system, open the linkage mode of the traction device and the second twisting member to realize the synchronous movement of the elastic waist rope in the whole process of step 3;

[0100] (4) when the second twisting member reaches the length limit point, the first twisting member moves towards the elastic waist rope through the left and right movement of the first mounting seat;

[0101] (5) The first twisting member "rope yarn bundle rotated by the yarn spindle" is the part to be twisted, and its head end is divided into three separate bundles (each bundle contains 8 twisted rope yarns), which are then fixed on the first fixed hook of the first twisting member; then the center of the first twisting member is adjusted to be coaxial with the center of the second twisting member through the control system;

[0102] (6) The first and second air claw assemblies are clamped and fixed to the woven rope through the control system;

[0103] (7) The three bundles of twisted rope yarns fixed in the second twisting member are fixed on the three second fixed hooks, respectively;

[0104] (8) Start the first and second twisting members to begin the twisting process of the elastic waist rope ends;

[0105] (9) To ensure the length accuracy of each part of the elastic waist rope, the distance between the first and second twisting members is 11.7-12M; the distance between the two sets of heavy-duty air claws and the twisting members on the same side is 2.5-2.7M;

[0106] (10) To achieve adjustable rope hardness of the elastic waist rope ends, the rotation speed ratio range formed by the driving twist and the rope twist is 1.2-1.5.

[0107] Example Two

[0108] The main rope in this embodiment adopts a single spindle single strand twill 28 weave structure, including the following steps:

[0109] Step 1: Compound and twist the polyolefin monofilament bundle with a specification of "10 roots *(0.07-0.075) g / m" and the polyester industrial filament bundle with a single yarn specification of 1000 Den to obtain the twisted rope yarn required for the elastic waist rope; in order to improve the wear resistance of the elastic waist rope, the process scheme of this forming process is set as follows:

[0110] (1) The weight proportion of HDPE in the polyolefin monofilament is in the range of 50%-70%;

[0111] (2) The appearance of the single yarn in the polyolefin monofilament bundle is round;

[0112] (3) The compound step of the polyolefin monofilament bundle and the polyester industrial filament is first compound and then twist;

[0113] (4) The compound method of the polyolefin monofilament bundle and the polyester industrial filament is parallel structure;

[0114] (5) In the twisting process, the twist is set to 40-50 TPM; the twist direction is set to positive.

[0115] Step 2: the twisted rope yarn prepared in step 1 is conducted on a pre-weaving machine to be plaited and pre-woven to prepare the pre-woven rope yarn required for the main body section of the elastic waist rope and the braided sheath of the elastic part.

[0116] Step 3: the pre-woven rope yarn prepared in step 2 is installed on a 28-spindle horizontal braiding machine to sequentially complete the following operations:

[0117] (1) the first rope yarn traction without spindle rotation is completed, with a length of 2.3-2.5M;

[0118] (2) the first braiding and traction of the elastic part of the main rope are completed with spindle rotation and with tight braiding, with a braiding pitch of 23-30mm; and in this process, the first elastic rod is stretched to 55-60CM under the action of the stretching weight; at the same time, in order to prevent the slip of the rope at both ends of the elastic rod and the external leakage of the elastic rod, the length of the transition area between the elastic part and the inner starting point of the part to be twisted is 30-40cm;

[0119] (3) the braiding and traction of the main body section with spindle rotation and normal pitch are completed, with a braiding pitch of 70-90mm and a length of 5.4-5.6M;

[0120] (4) the second braiding and traction of the elastic part of the main rope are completed with spindle rotation and with tight braiding, with a braiding pitch of 23-30mm; and in this process, the second elastic rod is stretched to 55-60CM under the action of the stretching weight; at the same time, in order to prevent the slip of the rope at both ends of the elastic rod and the external leakage of the elastic rod, the length of the transition area between the elastic part of the main rope and the inner starting point of the twisted end is 30-40cm;

[0121] (5) the second rope yarn traction without spindle rotation is completed, with a length of 2.3-2.5M.

[0122] Step 4: the braided rope prepared in step 3 is installed on the twisting device at both ends to complete the twisted section on the outside of each elastic part, and then the rope at both ends of the elastic rod is pulled out of the braided sheath and knitted into the elastic waist rope with a horse shoe buckle, thereby preparing the elastic waist rope with a twisted and braided integrated structure.

[0123] When the twisting process is completed by one-step method, the process flow is as follows:

[0124] (1) the second twisting member is moved horizontally to the rope outlet of the traction device by the control system;

[0125] (2) When the "rope yarn bundle without spindle rotation" of the part to be twisted, prepared in step 3.1, is pulled to the rope outlet by the pulling device, the head end thereof is divided into three separate bundles (each bundle containing 9, 9 and 10 twisted rope yarns respectively), and then fixed on any one of the second fixed hooks in the second twisting member at the same time;

[0126] (3) The linkage mode of the pulling device and the second twisting member is started by the control system, so as to realize the synchronous movement of the elastic waist rope in the whole process of step 3;

[0127] (4) When the second twisting member reaches the length limiting point, the first twisting member moves to the direction close to the elastic waist rope through the left and right movement of the first mounting seat;

[0128] (5) The "rope yarn bundle without spindle rotation" of the part to be twisted of the first twisting member is divided into three separate bundles (each bundle containing 8 twisted rope yarns), and then fixed on the first fixed hooks of the first twisting member in sequence; and then the center of the first twisting member is adjusted to be coaxial with the center of the second twisting member by the control system;

[0129] (6) The first air claw assembly and the second air claw assembly are clamped and fixed on the braided rope by the control system;

[0130] (7) The three bundles of "twisted rope yarns" fixed in the second twisting member are fixed on the three second fixed hooks respectively;

[0131] (8) The first twisting member and the second twisting member are started, and the twisting process of the two end parts of the elastic waist rope is started;

[0132] (9) In order to ensure the length accuracy of each part of the elastic waist rope, the distance between the two rotary integrated twisting devices in the twisting device is 11.7-12M; and the distance between the two sets of heavy load air claws and the rotary integrated twisting devices located on the same side is 2.5-2.7M;

[0133] (10) In order to realize the adjustable rope hardness of the two end twisted parts of the elastic waist rope, the rotation speed ratio range of the driving strand twist and the rope twist is 1.2-1.5.

[0134] The elastic waist ropes prepared in Example 1 and Example 2 are subjected to performance test, and the results are shown in the following table:

[0135]

[0136] It can be known from the comparison of the test data and the test data in "Truck Tarpaulin and Rope Net Test Analysis under Strong Wind Conditions" that the elastic waist rope prepared in the embodiment of the application not only improves the external friction resistance of the elastic waist rope under the premise of the same rope diameter, but also solves the situation that the elastic waist rope is pulled out or disconnected during use.

[0137] The above embodiments are only used to illustrate the present application, but not to limit it. Various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, and the like made within the spirit and principle of the present application shall fall into the scope of claims of the present application.

Claims

1. A forming device for an elastic waist rope that integrates twisting and braiding, characterized in that, The molding apparatus includes: A weaving machine, wherein a yarn spindle is installed at the weaving machine; A pitch-densing device, comprising a ring, a support tube, and a reversing wheel, wherein the support tube is fixed to the braiding machine, and the ring and the reversing wheel are located on both sides of the support tube; A tensioning device is located below the reversing wheel and is used to stretch the elastic rod. A twisting device, comprising a first twisting component adjacent to the braiding machine and a second twisting component away from the braiding machine, as well as a first mounting base supporting the first twisting component and a second mounting base supporting the second twisting component, wherein the first twisting component and the second twisting component are arranged facing each other and the twisting directions of the first twisting component and the second twisting component are opposite. A traction device is located between the braiding machine and the twisting device, and the braided rope at the braiding machine is pulled by the traction device to move toward the twisting device; An electronic control device, comprising a first electronic control component disposed at the traction device and a second electronic control component disposed at the twisting device.

2. The forming device for an integrated twisted and braided elastic waist rope according to claim 1, characterized in that, The twisting device further includes a first slide rail supporting the first mounting base and the second mounting base, wherein the second mounting base is movable along the extension direction of the first slide rail to bring the second twisting member closer to or away from the first twisting member.

3. The forming device for an integrated twisted and braided elastic waist rope according to claim 1, characterized in that, The twisting device further includes a first pneumatic gripper assembly located on one side of the first twisting member and a second pneumatic gripper assembly located on one side of the second twisting member. Both the first pneumatic gripper assembly and the second pneumatic gripper assembly are capable of clamping the braided rope located between the first twisting member and the second twisting member to counteract the twisting of the braided rope during twisting.

4. The forming device for an integrated twisted and braided elastic waist rope according to claim 3, characterized in that, The first pneumatic gripper assembly includes a first pneumatic gripper and a first support base supporting the first pneumatic gripper, the first pneumatic gripper being movable along the first support base; the second pneumatic gripper assembly includes a second pneumatic gripper and a second support base supporting the second pneumatic gripper, the second pneumatic gripper being movable along the second support base. The twisting device also includes a support platform that supports the first support base and the second support base.

5. The forming device for an integrated twisted and braided elastic waist rope according to claim 4, characterized in that, The first pneumatic gripper assembly further includes a first connecting rod that passes through the first pneumatic gripper and abuts against the first support base, and the first connecting rod is sleeved with a first elastic member; The second pneumatic gripper assembly further includes a second connecting rod that passes through the second pneumatic gripper and abuts against the second support base, and the second connecting rod is fitted with a second elastic member.

6. The forming device for an integrated twisted and braided elastic waist rope according to claim 1, characterized in that, The braided rope has a first twisted section connected to the first twisting member and a second twisted section connected to the second twisting member; The first twisting component is provided with three first fixing hooks along the circumference, and the first twisting section is divided into three bundles and fixed to the first fixing hooks in sequence. The second twisting component is provided with three second fixing hooks along the circumference, and the second twisting section is divided into three bundles and fixed to the first fixing hooks in sequence.

7. The forming device for an integrated twisted and braided elastic waist rope according to claim 1, characterized in that, The upper end of the reversing wheel is located 6-8 mm below the center of the supporting circular tube.

8. A method for manufacturing an elastic waist rope using the forming device described in claim 1, characterized in that, The manufacturing method includes: S1: Polyolefin monofilament bundles are compounded, twisted, and twisted with polyester industrial filaments or polyester industrial filament bundles to obtain the twisted rope yarn required for elastic waist ropes. S2: The twisted rope yarn in S1 is twisted together and pre-woven to obtain the main body of the elastic waist rope, as well as the pre-woven rope yarn required for weaving the sheath in the elastic part of the elastic waist rope. S3: Install the pre-woven yarn from S2 onto the braiding machine, and complete the following steps in sequence: S31: The first rope traction is completed after the spindle rotation is completed; S32: Complete the first weaving and traction of the woven sheath with spindle rotation and dense weaving treatment, and the elastic bar is woven on the inside of the woven sheath; S33: Complete the weaving and traction of the main body section with rotating spindles; S34: Complete the second weaving and traction of the woven sheath with spindle rotation and dense weaving treatment, and the elastic bar is woven on the inside of the woven sheath; S35: Complete the second rope traction without spindle rotation, and finally obtain the main body of the elastic waist rope and the elastic parts located on both sides of the main body. S4: Fix the two ends of the rope obtained in S3 to the twisting device to form a twisting section in the main body on the outside of each elastic part. Then, pull the ropes at both ends of each elastic rod out of the braided sheath and tie them together with the twisting section to obtain an elastic waist rope.

9. A method for manufacturing an elastic waist rope using the forming device described in claim 1, as described in claim 8, characterized in that, The twist direction of the twisted rope yarn described in S1 is S twist and Z twist, and the number of pre-woven rope yarns in S2 is the same for S twist and Z twist.

10. A method for manufacturing an elastic waist rope using the forming device described in claim 1, as described in claim 8, characterized in that, In step S3, after the elastic rod in S32 is stretched, it is passively and uniformly fed into the woven sheath. In step S3, the elastic rod in S34 is stretched and then passively and uniformly fed into the woven sheath.

Images