CN210651970U

CN210651970U - Novel thread laying head

Info

Publication number: CN210651970U
Application number: CN201921234509.7U
Authority: CN
Inventors: 肖睿
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2020-06-02
Anticipated expiration: 2029-08-01

Abstract

The utility model relates to a novel spread silk head belongs to the machine technical field of spreading silk, and yarn case parallel arrangement has two linear guide, spreads and installs the slider on the first relocation mechanism of silk, spreads first relocation mechanism of silk and uses through slider and linear guide cooperation, compresses tightly cylinder one end and links to each other with the yarn case, compresses tightly the cylinder other end and links to each other with spreading first relocation mechanism of silk, compresses tightly the cylinder drive and spreads first relocation mechanism of silk and slide on linear guide. The utility model discloses a yarn case can realize that eight preimpregnation material of four groups are rolled up and are put yarn and mutually noninterfere simultaneously, and the U type connecting plate left and right sides all is provided with two mounting panels that are parallel to each other, all is provided with two on every mounting panel and puts yarn and receive membrane mechanism, the whole volume of yarn case that has significantly reduced to prevented to add the narrow and small concave curved surface in space man-hour and easily take place to interfere with the mould, adopted a novel silk bundle to actuate the device simultaneously, reduced the cornerite of spreading the silk head, and then solved the not enough technical problem of reachability.

Description

Novel thread laying head

Technical Field

The utility model relates to a spread silk machine technical field, especially relate to a novel spread silk head.

Background

Automated filament placement has been widely used and developed over the last three decades and has become a typical representative of automated composite material forming techniques. Compared with an automatic tape laying technology, the automatic tape laying technology has better adaptability, and can be used for manufacturing composite material parts with complex curved surfaces. In terms of the filament spreading machine, the filament spreading heads of various manufacturers have different configurations but similar basic functions, and can complete the functions of yarn spreading by a compression roller, yarn feeding, yarn breaking, yarn stopping, tension control, temperature control, laying pressure control and the like.

The main five parts needing tension in the yarn laying head are as follows according to the front and back sequence of a yarn path from a yarn box to a die:

first, when wound on a spool, thermosetting prepreg must be provided with a backing film to prevent sticking to each other, and the backing film needs to be peeled off when laid. At present, a passive film collecting method is generally adopted by a filament paving machine, and generally, the larger the tension of the prepreg is, the better the film collecting effect is.

Second, in the process of leading the prepreg out of the bobbin to the press roller, the prepreg needs to be changed in direction several times by a plurality of guide wheels due to the arrangement of parts, and if there is no tension in the process, the prepreg may be released from the guide wheels, causing a malfunction of the apparatus.

Thirdly, the wire laying head is usually connected with the machine tool through a linear guide rail/air cylinder, namely the wire laying head is in floating connection with the machine tool, and the floating can compensate the error of the wire laying path along the normal direction of the curved surface of the part, which is necessary; however, the prepreg yarn ball is usually mounted on a machine tool, resulting in a variable length of prepreg yarn path in the laying head, so if there is no take-up tension of the prepreg, the prepreg will come loose when the yarn path is shortened, resulting in equipment failure.

Fourth, there are two methods of "cutting" and "chopping" for the fiber lay-down machine to cut the carbon fibers. As the name suggests, the principle of the method of 'shearing' is similar to that of scissors, and for the scissors, the larger the tension of carbon fibers is, the larger the shearing force is, the smaller the gap between the two edges of the scissors is, and the better the shearing effect is. Since a certain amount of cutting chips are generated by cutting the carbon fibers, if the distance between the cutting edges is too small, the cutting chips are gathered at the shredding mechanism, and even the mechanism is blocked. Therefore, commercial filament spreaders generally use a larger shear gap and cylinder diameter to maintain a certain tension to improve the reliability of filament cutting. The cutting mode is that the carbon fiber is cut on the chopping block by the cutter, the mode does not need fiber tension, but the cutter and the chopping block are in rigid collision in the mode, and the requirement on the quality of parts is high.

Fifthly, before the prepreg is laid on a mould, the prepreg needs to be flattened on a compression roller under the action of tension, otherwise, the quality of the formed part is affected, and defects such as surface ripples and the like can be generated.

It can be seen that the five mechanisms that have requirements on tension are: receive membrane mechanism, leading wheel, compress tightly cylinder and guide rail, shredding mechanism, compression roller. Wherein, the wire cutting mechanism and the compression roller are not suitable to be added with a mechanism, otherwise, the shortest wire laying length is increased, and the laying tension is not suitable to be reduced to zero, otherwise, the forming quality is influenced. The spreader typically uses a friction pad and load spring combination mechanism to control the tension of the prepreg at the payout spindle using a PID algorithm. It is obvious that it is not suitable to directly adjust the PID parameters to reduce the tension, which would result in a decrease in the reliability of several tension-affected mechanisms downstream of the feed path.

In practical application, the silk spreading process often has the condition of insufficient curved surface adaptability, and particularly, the existing automatic silk spreading equipment and process are often insufficient to meet the requirements when the negative curvature surface is processed. In order to improve reliability, certain tension is required to be provided for the prepreg in the laying process of the existing laying equipment, and the tension-provided prepreg is usually about 5N, so that defects such as fiber bridging and the like are frequently generated in the process of laying the prepreg with the tension on a concave curved surface, the forming speed is reduced, and the forming quality is poor.

Meanwhile, when the existing automatic filament spreading machine finishes filament cutting, the filament path cutter collides with a metal chopping board at high speed, so that the service life of elements (including the cutter and the chopping board) in the mode is short, and the requirement on the hardness of the cutter is high.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve present automatic silk machine of spreading silk way cutter and shredding the during operation in the completion to high-speed and metal chopping block bump, consequently the component of this kind of mode includes that cutter and chopping block life-span are shorter, has great requirement and takes tensile preimpregnation material to pave to paste at the in-process of concave curved surface to the hardness of cutter moreover, and the defect of fiber bridging often takes place, leads to the shaping speed to descend, and the not good technical problem of shaping quality, and then provides a novel silk head of spreading.

The utility model adopts the technical scheme that:

the utility model provides a novel spread the silk head, yarn case parallel arrangement has two linear guide, spreads and installs the slider on the first relocation mechanism of silk, spreads first relocation mechanism of silk and uses through slider and linear guide cooperation, compresses tightly cylinder one end and links to each other with the yarn case, compresses tightly the cylinder other end and spreads first relocation mechanism of silk and link to each other, and it slides on linear guide to compress tightly cylinder drive and spread first relocation mechanism of silk.

It includes to lay first relocation mechanism of silk: binding post mounting panel, riser, subtract and open the mechanism, the silk bundle actuates the device, flexible compression roller, the heating lamp, actuating mechanism, vortex tube and compress tightly the articulated seat of cylinder, binding post mounting panel both sides are provided with the riser, flexible compression roller, two subtract and open the mechanism and two silk bundles actuate the device and all set up inside the riser and link to each other with the riser, preimpregnation material is in proper order through subtracting and open the mechanism, the silk bundle actuates the device, flexible compression roller, install the heating lamp on the riser, the heating lamp is located directly over the preimpregnation material export of flexible compression roller, the slider is installed to the riser lateral wall, buffer cylinder, actuating mechanism, vortex tube and compress tightly the articulated seat of cylinder, vortex tube gas outlet sprays gas to preimpregnation material, it links to each other with.

Further, the yarn box includes: mounting panel, joint support board, yarn releasing and film receiving mechanism and U type connecting plate, the U type connecting plate left and right sides all is provided with two mounting panels that are parallel to each other, and the mounting panel other end of homonymy passes through joint support board and links to each other, all is provided with two yarn releasing and film receiving mechanisms on every mounting panel, is provided with linear guide on the U type connecting plate inner wall, compresses tightly cylinder one end and links to each other with U type connecting plate outer wall, installs limit stop on the U type connecting plate, and the last cushion cylinder's of shop's first relocation mechanism output and limit stop cooperation are used.

Further, it includes to put yarn and receive membrane mechanism: put yarn axle, receive membrane axle, tension measurement axle, yarn case leading wheel, measure the slide rail, measure slider, tension spring and resistance ruler, install on the mounting panel and put yarn axle, receive membrane axle and measure the slide rail, measure and install on the slide rail and measure the slider, measure and install the tension measurement axle on the slider, tension spring one end links to each other with measuring the slider, the tension spring other end links to each other with the mounting panel, resistance ruler fixed mounting is on the mounting panel, and resistance ruler removes the end and links to each other with measuring the slider, and the inside blind end of U type connecting plate is provided with the yarn case leading wheel.

Further, the drive mechanism includes: driving motor and drive reduction gear, driving motor is installed to drive reduction gear input, and drive reduction gear output and silk bundle actuate the device and link to each other, and drive reduction gear installs on the riser outer wall.

Further, the flexible press roll includes: the novel yarn guide device comprises a compression roller mounting frame, a compression roller, a yarn guide block and a yarn guide roller, wherein the compression roller mounting frame is installed on a vertical plate, the compression roller is installed between the two compression roller mounting frames, the yarn guide block is installed on one side of the compression roller, yarn guide grooves are formed in the upper end face of the yarn guide block and the arc-shaped face of the yarn guide block, the yarn guide grooves are alternately arranged on the upper end face of the yarn guide block and the arc-shaped face of the yarn guide block, and the.

Further, the tension reducing mechanism includes: a base, a yarn stopping wheel component, an intermediate wheel component, a friction wheel component, a guide wheel component and a tension reducing motor component,

the base up end is provided with ends yarn wheel subassembly, ends yarn wheel subassembly both sides and all is provided with the backup pad, and guide wheel subassembly both ends all link to each other with the backup pad, and middle wheel subassembly is installed to the backup pad upper end, installs the friction pulley subassembly on the middle wheel subassembly, and the friction pulley subassembly uses with middle wheel subassembly cooperation to carry out power transmission, and the tension reducing motor unit mount is on the backup pad lateral wall, and the tension reducing motor unit provides power for the friction pulley subassembly.

Further, the tow activation device: comprises an anvil wheel assembly; the chopping board wheel assembly comprises a group of chopping board wheel frames, the chopping board wheel frames are arranged on an automatic filament spreading machine, a plurality of groups of chopping board wheels are arranged on the chopping board wheel frames side by side, a driving shaft is arranged below the chopping board wheel assemblies, two ends of the driving shaft are arranged on the automatic filament spreading machine through bearing seats, a plurality of groups of cams are arranged on the driving shaft, a carbon fiber prepreg yarn path penetrates through the cams and the chopping board wheels, a group of positioning grooves are machined on the cams, a group of carbon fiber prepreg cutters are further arranged on the cams, a group of trigger air cylinder assemblies are arranged beside the driving shaft and comprise a group of air cylinder frames, a plurality of groups of trigger air cylinders are arranged on the air cylinder frames, a group of positioning bulges are arranged at the movable ends of the trigger air cylinders, and the positioning bulges are.

The utility model discloses following beneficial effect has to prior art:

the utility model discloses a realize that complicated curved surface is put, laid the tension reducing mechanism of overhead arranging of silk to developed and not relied on the tensile shredding mechanism of preimpregnation material, made to spread the preimpregnation material tension of putting on the mould and reduced, prevented the bridging phenomenon of preimpregnation material on concave curved surface.

The utility model discloses an among the tension reducing mechanism, the intermediate wheel can fluctuate, when the intermediate wheel is out of work, when the pinch roller need not compress tightly the carbon fiber promptly, the intermediate wheel is because gravity can fall, nevertheless because the baffle that floats is spacing, the distance of intermediate wheel whereabouts only is used for separating with the friction pulley, effectively prevents the accident and takes place.

The utility model discloses an among the tension reducing mechanism, friction pulley and friction pivot can rub and generate heat when adopting the intermediate wheel to have solved tension reducing, if let friction pulley and preimpregnation material direct contact probably lead to preimpregnation material to glue the problem on the friction pulley, the intermediate wheel plays the thermal isolation effect.

In the shredding mechanism of the utility model, too small gaps and chutes which are easy to cause the accumulation of cuttings do not exist, so that the machine does not need to be stopped and cleaned regularly like a shredding mechanism, and the productivity is higher;

the energy of the shredding of the utility model comes from the elastic potential energy of the compression spring, and the cylinder only plays the role of the trigger and does not provide the shredding energy, so that the cylinder has no requirement of instantaneous gas flow, which means that the trigger cylinder can use a direct-acting valve, the response time of the direct-acting valve is short, and the flow is small; the driving shaft can be inflated before the cam moves, and meanwhile, the stroke of the trigger cylinder is extremely short, so that the response time of the whole gas circuit is greatly reduced; can be reduced from more than 15ms to about 5 ms;

in the automatic laying process, the speed fluctuation of the end effector inevitably occurs, and when the speed fluctuation of 100mm/s occurs, a laying error of 0.1mm is generated for pneumatic delay of 1ms, and the maximum allowable error in the laying process is only 1mm, so that the laying precision is improved due to the rapidity of the prepreg actuating device mechanism, and the requirement on precision compensation is greatly reduced;

the utility model discloses three kinds of functions of yarn cutting, yarn feeding and yarn stopping in the aircraft nose of original automatic fiber placement machine have been integrated to same mechanism on to make control more concise.

The utility model discloses shred the effect and the tension of silk irrelevant, this mechanism size is less simultaneously to reduced and spread the first size of silk, this kind of characteristics have improved its technology adaptability and equipment accessibility simultaneously, make its specially adapted burden camber lay of surface.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

figure 2 is a top view of the inventive yarn box;

figure 3 is an isometric view of a yarn box of the present invention;

FIG. 4 is a schematic structural view of the floating mechanism of the spreading head of the present invention;

FIG. 5 is a schematic view of the installation position of the flexible compression roller of the present invention;

fig. 6 is a schematic structural view of the yarn guide block of the present invention;

fig. 7 is a right side view of the present invention;

fig. 8 is a schematic structural view of the tension reducing mechanism of the present invention;

fig. 9 is an exploded schematic view of the tension reducing mechanism of the present invention;

fig. 10 is a schematic view of the working state of the tension reducing mechanism of the present invention;

fig. 11 is a schematic structural view of the pinch roller assembly of the present invention;

fig. 12 is a schematic structural view of the intermediate wheel assembly of the present invention;

fig. 13 is a schematic view of the force analysis of the tension reducing mechanism of the present invention;

figure 14 is an isometric view of the tow activation device of the present invention;

figure 15 is an exploded view of the tow activation device of the present invention;

FIG. 16 is a schematic diagram of a free-state structure of a carbon fiber prepreg filament path of the present invention;

fig. 17 is a schematic structural view of a yarn cutting state of the carbon fiber prepreg yarn path of the present invention;

fig. 18 is a schematic structural view of a yarn stop state of the carbon fiber prepreg yarn path of the present invention;

fig. 19 is an overall perspective view of the cam of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In the first embodiment, two linear guide rails 3 are arranged on a yarn box 1 in parallel, a slide block 5 is arranged on a yarn-laying head floating mechanism 2, the yarn-laying head floating mechanism 2 is matched with the linear guide rails 3 through the slide block 5, one end of a pressing cylinder 4 is connected with the yarn box 1, the other end of the pressing cylinder 4 is connected with the yarn-laying head floating mechanism 2, the pressing cylinder 4 drives the yarn-laying head floating mechanism 2 to slide on the linear guide rails 3,

spread first relocation mechanism 2 of silk includes: the prepreg sequentially passes through the tension reducing mechanism 2-3, the filament bundle actuating device 2-4 and the flexible compression roller 2-5, the vertical plate 2-2 is provided with a heating lamp 2-6, the two tension reducing mechanisms 2-3 and the two filament bundle actuating devices 2-4, the heating lamp 2-6 is arranged on the vertical plate 2-2, the heating lamp 2-6 is positioned right above a prepreg outlet of the flexible compression roller 2-5, the outer side wall of the vertical plate 2-2 is provided with a sliding block 5, a buffer cylinder 6, a driving mechanism 2-7, a vortex tube 2-8 and a pressing cylinder hinged seat 2-9, a gas outlet of the vortex tube 2-8 sprays gas to the prepreg, the other end of the pressing cylinder 4 is connected with the pressing cylinder hinged seat 2-9, the driving mechanism 2-7 provides power for the tow actuating device 2-4, and the surface of the mold is heated by a heating lamp 2-6, so that the prepreg laid in the prior art has certain viscosity, the prepreg is favorably bonded, the prepreg on a yarn path inside a laying head is cooled by vortex 2-8, the equipment failure caused by the bonding of the prepreg on the yarn path is prevented, meanwhile, cooling compressed air blown out by the vortex tube 2-8 enters the yarn guide block, accumulated carbon fiber scraps are blown off, the temperature of the prepreg is reduced, and the adhesion of parts, the thread spreading head is provided with a buffer 6, so that the impact generated when the thread spreading head is pressed on the surface of a die by the pressing cylinder 4 is reduced.

Example two, the yarn box 1 comprises: a mounting plate 1-1, a connecting support plate 1-2 and a U-shaped connecting plate 1-3, the left side and the right side of the U-shaped connecting plate 1-3 are both provided with two parallel mounting plates 1-1, the other ends of the mounting plates 1-1 at the same side are connected through a connecting support plate 1-2, each mounting plate 1-1 is provided with two yarn releasing and film collecting mechanisms, the inner wall of the U-shaped connecting plate 1-3 is provided with a linear guide rail 3, one end of a pressing cylinder 4 is connected with the outer wall of the U-shaped connecting plate 1-3, the U-shaped connecting plate 1-3 is provided with a limit stop 7, the output end of a buffer cylinder 6 on a fiber laying head floating mechanism 2 is matched with the limit stop 7 for use, by the arrangement, the plurality of yarn film collecting mechanisms are arranged on the same mounting plate 1-1, so that the overall size is reduced, and the problem that the yarn film collecting mechanisms are easily interfered with a die during processing of a concave curved surface with narrow space is solved.

In a third embodiment, the yarn film collecting mechanism includes: the yarn unwinding device comprises yarn unwinding shafts 1-4, film winding shafts 1-5, tension measuring shafts 1-6, yarn box guide wheels 1-7, measuring slide rails 1-8, measuring slide blocks 1-9, tension springs 1-10 and resistance rulers 1-11, wherein the yarn unwinding shafts 1-4, the film winding shafts 1-5 and the measuring slide rails 1-8 are arranged on a mounting plate 1-1, the measuring slide blocks 1-9 are arranged on the measuring slide rails 1-8, the tension measuring shafts 1-6 are arranged on the measuring slide blocks 1-9, one ends of the tension springs 1-10 are connected with the measuring slide blocks 1-9, the other ends of the tension springs 1-10 are connected with the mounting plate 1-1, the resistance rulers 1-11 are fixedly arranged on the mounting plate 1-1, the moving ends of the resistance rulers 1-11 are connected with the measuring slide blocks 1-9, the closed end in the U-shaped connecting plate 1-3 is provided with a yarn box guide wheel 1-7, and the yarn releasing shaft 1-4 is provided with a friction plate or a torque motor and other devices which are pressed by an air cylinder, so that the prepreg is subjected to certain resistance when being pulled out from the bobbin, and the resistance is the carbon fiber basic tension. The film collecting shaft 1-5 is supported by a bearing, and the rotation resistance is extremely small. The prepreg with the backing paper is wound around the film collecting shaft 1-5, the backing paper at the end of the fiber is stripped off when the prepreg roll is installed, the end of the stripped backing paper is wound on the film collecting shaft 1-5 only around the backing paper, the carbon fiber prepreg continues to advance to the downstream of the yarn path, and the backing paper is passively wound on the film collecting shaft 1-5 as the prepreg is further pulled out. The prepreg with the backing paper removed is further wound on a tension measuring shaft 1-6 which is arranged on a measuring slide block 1-9 and is tensioned by a tension spring 1-10, the length of the tension spring 1-10 can be changed along with the fluctuation of the tension of the carbon fiber, the tension of the carbon fiber can be measured in real time by measuring the length of the tension spring 1-10 by a resistance ruler 1-11, and an equipment numerical control system controls the yarn releasing resistance at the yarn releasing shaft through the measured tension, such as changing the pressure of a cylinder for pressing a friction plate, or adjusting the torque of a torque motor, so that the real-time control of the tension of each fiber is realized.

In a fourth embodiment, the driving mechanism 2-7 includes: the device comprises driving motors 2-71 and driving speed reducers 2-72, wherein the driving motors 2-71 are installed at the input ends of the driving speed reducers 2-72, the output ends of the driving speed reducers 2-72 are connected with tow actuating devices 2-4, and the driving speed reducers 2-72 are installed on the outer walls of vertical plates 2-2.

In a fifth embodiment, the compliant pressure rollers 2-5 comprise: the device comprises compression roller mounting frames 2-51, compression rollers 2-52, yarn guide blocks 5-23 and yarn guide rollers 5-24, wherein the compression roller mounting frames 2-51 are mounted on a vertical plate 2-2, the compression rollers 2-52 are mounted between the two compression roller mounting frames 2-51, the yarn guide blocks 5-23 are mounted on one sides of the compression rollers 2-52, yarn guide grooves are formed in the upper end faces and the arc faces of the yarn guide blocks 5-23, the yarn guide grooves in the upper end faces and the arc faces of the yarn guide blocks 5-23 are alternately arranged, the yarn guide rollers 5-24 are arranged at the inlets of the upper yarn guide grooves and the lower yarn guide grooves of the yarn guide blocks 5-23, two sets of tension reducing devices 2-3 and two sets of yarn actuating devices 2-4 are mounted at the upper end and the lower end of a yarn laying head, the two tension reducing mechanisms 2-3 respectively reduce, and finally collecting the upper prepreg and the lower prepreg at the positions of the yarn guide blocks 5-23 to form a bundle of seamless tows, and tightly pressing the tows on the surface of the die by a flexible pressing roller 2-5.

The prepreg roll is arranged on the yarn releasing shaft 1-4, one end of the prepreg roll sequentially bypasses the film collecting shaft 1-5, the tension measuring shaft 1-6, the yarn box guide wheel 1-7, the tension reducing mechanism 2-3 and the tow actuating device 2-4, and finally the prepreg is pressed on the die by the flexible compression roller 2-5.

Example six: the tension reducing mechanism 2-3 includes: 2-3-1 of a base, 2-3-2 of a yarn stopping wheel component, 2-3-3 of a middle wheel component, 2-3-4 of a friction wheel component, 2-3-5 of a guide wheel component and 2-3-6 of a tension reducing motor component,

the upper end face of the base 2-3-1 is provided with a yarn stopping wheel component 2-3-2, two sides of the yarn stopping wheel component 2-3-2 are respectively provided with a supporting plate 2-3-7, two ends of a guide wheel component 2-3-5 are respectively connected with the supporting plates 2-3-7, the upper end of the supporting plate 2-3-7 is provided with an intermediate wheel component 2-3-3, the intermediate wheel component 2-3-3 is provided with a friction wheel component 2-3-4, the friction wheel component 2-3-4 is matched with the intermediate wheel component 2-3-3 for power transmission, a tension reducing motor component 2-3-6 is arranged on the side wall of the supporting plate 2-3-7, and the tension reducing motor component 2-3-6 provides power for the friction wheel component 2-3-4, according to the arrangement, the tension on the prepreg is resisted by the friction wheel assemblies 2-3-4, so that the requirement of flattening the prepreg is met.

The pressing wheel assembly 2-3-2 is formed by connecting a plurality of yarn stopping wheel mechanisms side by side, and each yarn stopping wheel mechanism comprises: the yarn stopping device comprises a hinged support 2-3-2-1, a hinged shaft 2-3-2-2, a spring plunger 2-3-2-3, a yarn stopping wheel 2-3-2-4, a one-way bearing 2-3-2-5, a yarn stopping cylinder support column 2-3-2-6, a spring plunger support column 2-3-2-7 and a mounting plate 2-3-2-8, wherein the hinged support 2-3-2-1 is mounted on a base 2-3-1, the hinged shaft 2-3-2-1 is mounted on the left side wall and the right side wall of the hinged support 2-3-2-1, the mounting plates 2-3-2-8 are arranged on two sides of the hinged support 2-3-2-1, the side wall of the mounting plate 2-3-2-8 is connected with the articulated shaft 2-3-2-2, the middle part of the mounting plate 2-3-2-8 is provided with a yarn stopping rotating shaft 2-3-2-10, the yarn stopping wheel 2-3-2-4 is arranged on the yarn stopping rotating shaft 2-3-2-10 through a one-way bearing 2-3-2-5, two ends of the mounting plate 2-3-2-8 are respectively provided with a yarn stopping cylinder supporting column 2-3-2-6 and a spring plunger supporting column 2-3-2-7, one end of the hinged support 2-3-2-1 is provided with a spring plunger 2-3-2-3, the spring plunger 2-3-2-3 is positioned under the spring plunger supporting column 2-3-2-7, the yarn stopping cylinder 2-3-2-9 is vertically arranged on the lower end face of the base 2-3-1, the output end of the yarn stopping cylinder 2-3-2-9 passes through the base 2-3-1 and is arranged under the pressing cylinder supporting column 2-3-2-6, the arrangement is that the hinge shaft 2-3-2-2, the yarn stopping cylinder supporting column 2-3-2-6 and the spring plunger supporting column 2-3-2-7 form a lever principle, the yarn stopping cylinder supporting column 2-3-2-6 is a power input point, the hinge shaft 2-3-2-2 is a fulcrum, the spring plunger supporting column 2-3-2-7 is a resistance input point, and the yarn stopping cylinder 2-3-2-9 is an input power, the spring plunger 2-3-2-3 is resistance input, the position of the yarn stopping wheel 2-3-2-4 can be effectively adjusted, and the yarn stopping wheel 2-3-2-4 is arranged on a swing lever and can amplify the acting force of the yarn stopping cylinder 2-3-2-9. The spring plunger 2-3-2-3 supports, so that the yarn stopping wheel 2-3-2-4 can be pushed away from the middle wheel by the spring plunger 2-3-2-3 under the condition that the yarn stopping cylinder 2-3-2-9 does not work, a gap is formed between the middle wheel and the yarn stopping wheel 2-3-2-4, and yarn threading is facilitated during material changing.

The guide wheel assembly 2-3-5 comprises guide wheels 2-3-5-1 and guide rotating shafts 2-3-5-2, two ends of each guide rotating shaft 2-3-5-2 are connected with the corresponding supporting plate 2-3-7, the axis of each guide rotating shaft 2-3-5-2 is parallel to the axis of each yarn stopping rotating shaft 2-3-2-10, the guide rotating shafts 2-3-5-2 are provided with a plurality of guide wheels 2-3-5-1, and the number of the guide wheels 2-3-5-1 is the same as that of the yarn stopping wheels 2-3-2-4, and the guide wheels are corresponding in position.

The intermediate wheel assembly 2-3-3 includes: the U-shaped installation frame 2-3-1, the hinging blocks 2-3-3-2, the middle wheels 2-3-3-3, the middle wheel U-shaped frame 2-3-3-4, the floating baffle 2-3-5 and the fixing plate 2-3-3-6, wherein the U-shaped installation frame 2-3-3-1 is arranged on the fixing plate 2-3-3-6, the fixing plate 2-3-3-6 is provided with a plurality of hinging blocks 2-3-3-2 side by side, the hinging blocks 2-3-3-2 are positioned at the opening end of the U-shaped installation frame 2-3-3-1, the opening end of the middle wheel U-shaped frame 2-3-4 is hinged with one end of the hinging blocks 2-3-3-2, the closed end of the lower end face of the U-shaped mounting frame 2-3-3-1 is provided with a floating baffle 2-3-5, the floating baffle 2-3-3-5 limits the closed end of the middle wheel U-shaped frame 2-3-3-4, a gap is reserved between the floating baffle 2-3-5 and the middle wheel U-shaped frame 2-3-3-4, the middle wheel U-shaped frame 2-3-4 is provided with a middle wheel 2-3-3-3, the axle axis of the middle wheel 2-3-3-3 is parallel to the axle axis of the yarn stopping rotating shaft 2-3-2-10, the number of the middle wheels 2-3-3-3 is the same as that of the yarn stopping wheels 2-3-2-4, and the positions are corresponding, according to the arrangement, the transmission force of the intermediate wheel 2-3-3-3 is used for friction heating of the friction wheel and the friction rotating shaft during tension reduction, if the friction wheel is directly contacted with prepreg, the prepreg can be adhered to the friction wheel, the intermediate wheel 2-3-3-3 plays a thermal isolation role, meanwhile, the intermediate wheel 2-3-3-3 can float up and down, when the whole device stops, the intermediate wheel can fall due to gravity, but due to the limitation of the floating baffle plate, the falling distance of the intermediate wheel is only used for separating from the friction wheel, and accidents are effectively prevented.

The friction wheel assembly 2-3-4 includes: the tension reducing motor component comprises a bearing seat 2-3-4-1, a friction rotating shaft 2-3-4-2 and friction wheels 2-3-4-3, two ends of the friction rotating shaft 2-3-4-2 are fixed on the upper end face of a fixing plate 2-3-3-6 through the bearing seat 2-3-4-1, the axis of the friction rotating shaft 2-3-4-2 is parallel to the axis of a wheel shaft of an intermediate wheel 2-3-3-3, a plurality of friction wheels 2-3-4-3 are mounted on the friction rotating shaft 2-3-4-2, the number of the friction wheels 2-3-4-3 is the same as that of the intermediate wheel 2-3-3, the positions of the friction wheels are corresponding to those of the intermediate wheel 2-3-4-3, and one end of the friction rotating shaft 2-3-4-2 is corresponding And the friction wheel 2-3-4-3 is attached to the intermediate wheel 2-3-3-3, the friction rotating shaft 2-3-4-2 and the friction wheel 2-3-4-3 rotate relatively, and the friction rotating shaft 2-3-4-2 and the friction wheel 2-3-4-3 generate relative friction force for balancing the tension of the prepreg.

The tension-reducing motor assembly 2-3-6 comprises: the tension reducing motor 2-3-6-1 and the speed reducer 2-3-6-2 are connected with the side wall of the supporting plate 2-3-7 through a support, the output end of the tension reducing motor 2-3-6-1 is connected with the input end of the speed reducer 2-3-6-2, and the output end of the speed reducer 2-3-6-2 is connected with one end of the friction rotating shaft 2-3-4-2.

Prepreg moves from right to left under the action of the pulling force of other components of the filament spreading machine, one prepreg passes through each yarn stopping wheel 2-4, the yarn stopping air cylinders 2-3-2-9 work to push the yarn stopping air cylinder supporting columns 2-3-2-6 to drive the yarn stopping wheels 2-3-2-4 to move upwards to compact the prepreg, the prepreg drives the middle wheels 2-3-3-3 to rotate to drive the friction wheels 2-3-4-3 to rotate, the tension reducing motor 2-3-6-1 drives the friction rotating shafts 2-3-4-2 to rotate, the steering directions of the friction rotating shafts 2-3-4-2 are the same as the steering directions of the friction wheels 2-3-4-3, and the rotating speed of the friction rotating shafts is controlled by a numerical control system, the rotation angular speed of the prepreg is always larger than the passive rotation angular speed of the friction wheel driven by the prepreg, friction can be generated between the friction rotating shaft 2-3-4-2 and the friction wheel 2-3-4-3, the generated friction force is transmitted to the prepreg by the intermediate wheel 2-3-3-3, and the tension on the prepreg is balanced to reduce the tension on the prepreg due to the fact that the direction of the tension on the prepreg is opposite to that of the friction force, and the function of reducing the tension is achieved.

Prepreg tension balance principle:

the prepreg is clamped between the yarn stopping wheel 2-3-2-4 and the intermediate wheel 2-3-3-3 by the compaction air cylinder 2-3-2-9, and the prepreg advances from right to left. The intermediate wheel 2-3-3-3 can float up and down, and the pressing force is transmitted to the friction wheel 2-3-4-3 through the intermediate wheel 2-3-3-3. The friction wheel 2-3-4-3 is directly penetrated on one friction rotating shaft 2-3-4-2, the friction rotating shaft 2-3-4-2 rotates anticlockwise at a speed higher than the maximum filament spreading speed, and the yarn stopping wheel 2-3-2-4 is connected with the yarn stopping rotating shaft 2-3-2-10 by adopting a one-way bearing 2-3-2-5 and can only rotate anticlockwise. Because the yarn stopping wheel 2-3-2-4 can only rotate anticlockwise, when the static friction force of the yarn stopping wheel 2-3-2-4 on the prepreg is greater than the fiber tension force, the prepreg cannot be drawn back by the tension force, the friction coefficient between the friction rotating shaft 2-3-4-2 and the friction wheel 2-3-4-3 is set to be mu, and the prepreg tension force is set to be F_tThe pressure of the yarn stopping wheel 2-3-2-4 to the intermediate wheel 2-3-3-3 is F_pUnder the working condition, the stress condition of each wheel is as shown in fig. 13:

therefore, the pressing force is transmitted between the friction wheel 2-3-4-3 and the friction rotating shaft 2-3-4-2, and as the friction rotating shaft 2-3-4-2 rotates anticlockwise and the rotating angular velocity is always greater than the passive rotating angular velocity generated by the friction wheel under the action of the prepreg, a sliding friction force with the magnitude of F is generated between the friction rotating shaft 2-3-4-2 and the friction wheel 2-3-4-3_pMu, which will generate a driving torque T ═ F for the friction wheel 2-3-4-3_pμ · r. When the yarn is laid at a constant speed, the friction wheels 2-3-4-3 are in torque balance, so that the middle wheel 2-3-3 has a friction force to the friction wheels 2-3-4-3

The maximum static friction force between the friction wheel 2-3-4-3 and the middle wheel 2-3-3-3 is F_pMu, which is significantly greater than f, so that slip occurs between the friction wheel 2-3-4-3 and the friction rotating shaft 2-3-4-2 instead of between the friction wheel 2-3-4-3 and the intermediate wheel 2-3-3. Since the intermediate wheel 2-3-3-3 also rotates at a constant speed, the driving force of the intermediate wheel 2-3-3-3 on the prepreg is also equal to f. Thus, after passing through the strain relief mechanism, the tension of the prepreg will become:

it can be seen that when F_tIf f is greater than f, the prepreg passing through the tension reducing mechanism is in a constant motion state, but the tension is reduced. By adjusting the pressing force F_pThe tension of the tows can be freely adjusted by adjusting the air pressure of the yarn stopping cylinder 2-3-2-9. Because the rotating speed of the friction rotating shaft 2-3-4-2 is always greater than the maximum filament spreading speed, a series of friction wheels 2-3-4-3 which are threaded on the same friction rotating shaft 2-3-4-2 do not influence each other and can independently play a role in tension reduction.

Example seven: tow actuating device 2-4: comprises a chopping board wheel component 2-4-1; the chopping board wheel assembly 2-4-1 comprises a group of chopping board wheel frames 2-4-11, the chopping board wheel frames 2-4-11 are arranged on an automatic filament spreading machine, a plurality of groups of chopping board wheels 2-4-12 are arranged on the chopping board wheel frames 2-4-11 side by side, a driving shaft 2-4-2 is arranged below the chopping board wheel assembly 2-4-1, two ends of the driving shaft 2-4-2 are arranged on the automatic filament spreading machine through bearing seats, a plurality of groups of cams 2-4-3 are arranged on the driving shaft 2-4-2, a carbon fiber prepreg yarn path penetrates through the space between the cams 2-4-3 and the chopping board wheels 2-4-12, a group of positioning grooves 2-4-31 are processed on the cams 2-4-3, the cam 2-4-3 is further provided with a group of carbon fiber prepreg cutters 2-4-32, a group of trigger air cylinder assemblies 2-4-4 is arranged beside the driving shaft 2-4-2, the trigger air cylinder assemblies 2-4-4 comprise a group of air cylinder frames 2-4-41, a plurality of groups of trigger air cylinders 2-4-42 are arranged on the air cylinder frames 2-4-41, a group of positioning protrusions 2-4-43 are arranged at the movable ends of the trigger air cylinders 2-4-42, and the positioning protrusions 2-4-43 are matched with the positioning grooves 2-4-31 in the cam 2-4-3.

The anvil plate wheel 2-4-12 is pre-tightened by a compression spring 2-4-13.

The number of the cams 2-4-3 is the same as that of the anvil wheels 2-4-12, and the positions of the cams correspond up and down.

The number of the trigger cylinders 2-4-42 is the same as that of the cams 2-4-3, and the positions of the trigger cylinders correspond to the left and the right.

The driving shaft 2-4-2 is driven to rotate by a driving motor 2-71; on the driving shaft 2-4-2, a parallel cam 2-4-3 is arranged at the position corresponding to each yarn in the carbon fiber prepreg yarn path; a chopping block wheel corresponding to each cam 2-4-3 is arranged above each cam, the chopping block wheels are pre-tightened by a compression spring, and a prepreg yarn path passes through the space between each cam 2-4-3 and each chopping block wheel; the drive shaft 2-4-2 is constructed with a drive or with a pre-tensioned spring, which presses a friction plate against the inside of each cam 2-4-3, so that the cams 2-4-3 and the drive shaft 2-4-2 engage with each other, thereby transmitting torque between the drive shaft 2-4-2 and the cams 2-4-3. When the driving shaft rotates, the cam 2-4-3 rotates along with the driving shaft under the action of friction force; by designing the profile of the cam 2-4-3 and arranging the carbon fiber prepreg cutters 2-4-32 on the cam, the distance between the cam and the anvil plate wheel is changed in the process that the cam 2-4-3 rotates for one circle; the prepreg will be in a clamped, free or cut-off state with the change of distance; a trigger cylinder 2-4-42 is arranged on one side of the cam 2-4-3, and when the trigger cylinder 2-4-42 pushes the positioning bulge 2-4-43 to be clamped into a groove on the cam 2-4-3, the cam 2-4-3 is in a static state; when the driving shaft 2-4-2 starts to rotate, the trigger cylinder 2-4-42 retracts, the cam 2-4-3 is locked with the driving shaft 2-4-2 and starts to rotate along with the driving shaft 2-4-2, when the positioning groove 2-4-31 on the cam 2-4-3 moves to the trigger cylinder 2-4-42 again, the trigger cylinder 2-4-42 pushes the positioning bulge 2-4-43 to be clamped into the cam 2-4-3 to make the cam still, at the moment, the driving shaft 2-4-2 can still rotate, the driving shaft 2-4-2 and the cam 2-4-3 slip, when all the cams 2-4-3 are completely moved and are stuck, the drive shaft 2-4-2 is stopped to prevent excessive friction; the combined action of the air cylinder and the driving shaft can be used for controlling the cyclic reciprocation of the state, thereby finishing the actions of yarn stopping, yarn feeding and yarn cutting.

The utility model has no undersize gap and chute which are easy to cause the accumulation of cutting scraps, so that the regular shutdown and cleaning are not needed like a wire cutting mechanism, and the productivity is higher;

in the automatic laying process, the end effector inevitably generates speed fluctuation, and when the speed fluctuation of 100mm/s is generated, 0.1mm laying error is generated for pneumatic delay of 1ms, and the maximum allowable error in the laying process is only 1mm, so that the laying precision is improved due to the rapidity of the mechanism, and the requirement on precision compensation is greatly reduced;

the utility model discloses three kinds of functions of yarn cutting, yarn feeding and yarn stopping in the aircraft nose of original automatic filament paving machine have been integrated to same mechanism to make control more succinct

Claims

1. A novel yarn spreading head is characterized in that two linear guide rails (3) are arranged on a yarn box (1) in parallel, a slide block (5) is arranged on a yarn spreading head floating mechanism (2), the yarn spreading head floating mechanism (2) is matched with the linear guide rails (3) through the slide block (5) for use, one end of a pressing air cylinder (4) is connected with the yarn box (1), the other end of the pressing air cylinder (4) is connected with the yarn spreading head floating mechanism (2), and the pressing air cylinder (4) drives the yarn spreading head floating mechanism (2) to slide on the linear guide rails (3),

the wire laying head floating mechanism (2) comprises: the wire connecting terminal comprises a wire connecting terminal mounting plate (2-1), vertical plates (2-2), tension reducing mechanisms (2-3), wire bundle actuating devices (2-4), flexible press rollers (2-5), heating lamps (2-6), driving mechanisms (2-7), vortex tubes (2-8) and compression cylinder hinged seats (2-9), wherein the vertical plates (2-2) are arranged on two sides of the wire connecting terminal mounting plate (2-1), the flexible press rollers (2-5), the two tension reducing mechanisms (2-3) and the two wire bundle actuating devices (2-4) are all arranged in the vertical plates (2-2) and connected with the vertical plates (2-2), and prepreg sequentially passes through the tension reducing mechanisms (2-3), the wire bundle actuating devices (2-4) and the flexible press rollers (2-5), the vertical plate (2-2) is provided with a heating lamp (2-6), the heating lamp (2-6) is positioned right above a prepreg outlet of the flexible compression roller (2-5), the outer side wall of the vertical plate (2-2) is provided with a sliding block (5), a buffer cylinder (6), a driving mechanism (2-7), a vortex tube (2-8) and a pressing cylinder hinged seat (2-9), the gas outlet of the vortex tube (2-8) sprays gas to the prepreg, the other end of the pressing cylinder (4) is connected with the pressing cylinder hinged seat (2-9), and the driving mechanism (2-7) provides power for the filament bundle actuating device (2-4).

2. A new type of laying head according to claim 1, characterized in that said yarn box (1) comprises: a mounting plate (1-1), a connecting support plate (1-2), a yarn releasing and film collecting mechanism and a U-shaped connecting plate (1-3), the yarn spreading machine is characterized in that two parallel mounting plates (1-1) are arranged on the left side and the right side of the U-shaped connecting plate (1-3), the other ends of the mounting plates (1-1) on the same side are connected through connecting support plates (1-2), two yarn releasing and film receiving mechanisms are arranged on each mounting plate (1-1), linear guide rails (3) are arranged on the inner wall of the U-shaped connecting plate (1-3), one end of a pressing cylinder (4) is connected with the outer wall of the U-shaped connecting plate (1-3), a limit stop block (7) is arranged on the U-shaped connecting plate (1-3), and the output end of a buffer cylinder (6) on the yarn spreading head floating mechanism (2) is matched with the limit stop block (.

3. The novel yarn laying head as claimed in claim 2, wherein the yarn releasing and film collecting mechanism comprises: the yarn unwinding device comprises yarn unwinding shafts (1-4), film winding shafts (1-5), tension measuring shafts (1-6), yarn box guide wheels (1-7), measuring slide rails (1-8), measuring slide blocks (1-9), tension springs (1-10) and resistance rulers (1-11), wherein the yarn unwinding shafts (1-4), the film winding shafts (1-5) and the measuring slide rails (1-8) are installed on a mounting plate (1-1), the measuring slide blocks (1-9) are installed on the measuring slide rails (1-8), the tension measuring shafts (1-6) are installed on the measuring slide blocks (1-9), one ends of the tension springs (1-10) are connected with the measuring slide blocks (1-9), the other ends of the tension springs (1-10) are connected with the mounting plate (1-1), the resistance rulers (1-11) are fixedly installed on the mounting plate (1-1), the movable end of the resistance ruler (1-11) is connected with the measuring slide block (1-9), and the closed end in the U-shaped connecting plate (1-3) is provided with a yarn box guide wheel (1-7).

4. A new threading head according to claim 1, characterized in that said driving mechanism (2-7) comprises: the device comprises driving motors (2-71) and driving speed reducers (2-72), wherein the driving motors (2-71) are installed at the input ends of the driving speed reducers (2-72), the output ends of the driving speed reducers (2-72) are connected with tow actuating devices (2-4), and the driving speed reducers (2-72) are installed on the outer wall of a vertical plate (2-2).

5. A new laying head according to claim 1, characterised in that said flexible pressing rollers (2-5) comprise: the vertical yarn guiding device comprises compression roller mounting frames (2-51), compression rollers (2-52), yarn guide blocks (5-23) and yarn guiding guide rollers (5-24), wherein the compression roller mounting frames (2-51) are installed on vertical plates (2-2), the compression rollers (2-52) are installed between the two compression roller mounting frames (2-51), the yarn guide blocks (5-23) are installed on one sides of the compression rollers (2-52), yarn guiding grooves are formed in the upper end faces and the arc-shaped faces of the yarn guide blocks (5-23), the yarn guide grooves in the upper end faces and the arc-shaped faces of the yarn guide blocks (5-23) are alternately arranged, and the yarn guiding guide rollers (5-24) are arranged at the inlets of the upper yarn guide grooves and the lower yarn guide grooves of the.

6. A new type of laying head according to claim 1, characterized in that said tension reducing means (2-3) comprise: a base (2-3-1), a yarn stopping wheel component (2-3-2), an intermediate wheel component (2-3-3), a friction wheel component (2-3-4), a guide wheel component (2-3-5) and a tension reducing motor component (2-3-6),

the yarn stopping wheel component (2-3-2) is arranged on the upper end face of the base (2-3-1), supporting plates (2-3-7) are arranged on two sides of the yarn stopping wheel component (2-3-2), two ends of the guide wheel component (2-3-5) are connected with the supporting plates (2-3-7), an intermediate wheel component (2-3-3) is arranged on the upper end of the supporting plates (2-3-7), a friction wheel component (2-3-4) is arranged on the intermediate wheel component (2-3-3), the friction wheel component (2-3-4) and the intermediate wheel component (2-3-3) are matched for use to transmit power, the tension reducing motor component (2-3-6) is arranged on the side wall of the supporting plates (2-3-7), the tension reducing motor component (2-3-6) provides power for the friction wheel component (2-3-4).

7. A new laying head according to claim 1, characterised in that the tow actuation device (2-4): comprises a chopping board wheel component (2-4-1); the chopping board wheel assembly (2-4-1) comprises a group of chopping board wheel frames (2-4-11), the chopping board wheel frames (2-4-11) are arranged on an automatic filament paving machine, a plurality of groups of chopping board wheels (2-4-12) are arranged on the chopping board wheel frames (2-4-11) side by side, a driving shaft (2-4-2) is arranged below the chopping board wheel assemblies (2-4-1), two ends of the driving shaft (2-4-2) are arranged on the automatic filament paving machine through bearing seats, a plurality of groups of cams (2-4-3) are arranged on the driving shaft (2-4-2), carbon fiber prepreg yarn paths penetrate between the cams (2-4-3) and the chopping board wheels (2-4-12), and a group of positioning grooves (2-4) are processed on the cams (2-4-3) 31) The cam (2-4-3) is also provided with a group of carbon fiber prepreg cutters (2-4-32), a group of trigger air cylinder assemblies (2-4-4) are arranged beside the driving shaft (2-4-2), the trigger air cylinder assemblies (2-4-4) comprise a group of air cylinder frames (2-4-41), a plurality of trigger cylinders (2-4-42) are arranged on the cylinder frame (2-4-41), a group of positioning bulges (2-4-43) are arranged at the movable end of the trigger cylinders (2-4-42), the positioning bulge (2-4-43) is matched with the positioning groove (2-4-31) on the cam (2-4-3).