CN103717361A

CN103717361A - Method and apparatus for cutting continuous fiber in fixed lengths and continuous accurate measurement thereof

Info

Publication number: CN103717361A
Application number: CN201280014527.9A
Authority: CN
Inventors: 李良光; 蒋鼎丰
Original assignee: Fujian Haiyuan Automatic Equipments Co ltd
Current assignee: Jiangxi Haiyuan composite material technology Co.,Ltd.
Priority date: 2011-04-08
Filing date: 2012-04-06
Publication date: 2014-04-09
Anticipated expiration: 2032-04-06
Also published as: CN202114746U; WO2012136141A1; CN103717361B

Abstract

Disclosed are a method and an apparatus for cutting continuous fiber in fixed lengths and continuous accurate measurement thereof. In the feed direction, an external servo motor (6) accurately adjusts the rotational speed of a rotating-hob cutting machine (2) for cutting a plurality of strands of continuous fiber (1); the fibers, having been cut, enter the feed port of an extruder; a sensor detects the number of long fiber strands; a control system, having obtained a sensor signal of the number of strands and having implemented comparison and differentiation, transmits, according to a certain method for cutting the fixed length volume of fiber, the relevant rotational speed adjustment control signal to the servo motor (6). The advantages of the method and apparatus are: the length of the fiber is controlled manually in advance, ensuring the fiber can reach the greatest length; as the fiber measurement is unrelated to the rotational speed of a screw, the screw can easily meet the highest technical requirements for the mixing and extrusion processes; the cut fiber in fixed lengths is preheated before being mixed with a melt, improving the melt-wetting of the fiber; also, the apparatus for cutting continuous fiber in fixed lengths is disposed outside of the extruder, facilitating apparatus maintenance.

Description

The continuous fiber customized cut-off method and apparatus of continuous accurate measurement

Technical field

It is the extrusion molding of the thermoplastic composite of fiber reinforcement type the present invention relates to composite processing field, more particularly to a kind of continuous fiber fixed-length cutting device of continuous accurate measurement.

Background technology

LFT（Long Fiber reinforced Thermoplastics）, i.e. long fiber reinforcement thermoplastic, so-called long fibre is to strengthen fiber used in thermoplastic with general fibre to compare.Under normal circumstances, the fibre length in fiber-reinforced thermoplastic is that and in LFT, the length of fiber is generally higher than 2 millimeters, even is able to the fibre length in LFT being maintained at more than 5 millimeters less than 1 millimeter.

LFT-D-ILC is referred to as long fiber reinforcement thermoplastic direct-on-line compounding process technology（Long Fiber reinforced Thermoplastics-Direct processing-In Line Compounding）.The applications of LFT in the car are in the trend increased rapidly, and except attraction economically, their main advantage is the flexibility that material can be compounded wherein.The fiber content of continuous variable, different types of fiber, along with engineering plastics, open potential application field.

This direct-on-line fiber mixed system integration is in moulding process, and common is to use second order screw rod extruder, i.e., complete extruding-out process by two screw extruder synthetic operations.

Thermoplastic plastic particle material or powder and other auxiliary agents are first added from the hopper of the first rank screw extruder, are plastified by screw rod, the molten polymer after plasticizing is extruded at the extrusion neck ring mold of the first rank screw extruder, into the charging aperture of second-order screw extruder.

Fiber is before extrusion machine inlet progress mixture is entered, fiber need to generally be heated, typically the continuous fiber of twisting with shift fork drawout, then by the continuous a few road hot-rollings heating of firing equipment, need to then be involved in charging aperture into second-order screw extruder.

Sheared through second-order extruder, the moulding compound of mixture extrusion is transported to compacting（Or injection）In former, thus equipment completes the shaping work of LFT-D-ECM or LFT-D-IM techniques.

In addition, must also be measured to fiber, to ensure the fibre weight controllable precise with molten polymer mixture.The length control of fiber and content measure the screw rod usually relied in double screw extruder and cut and adjust the rotating speed of extruder to achieve the goal, but this design has the following disadvantages：

One is that the shortcoming that screw rod is cut is to be difficult the length of accurate control fibre cutting and be not easy to make fiber keep preferable length percent, cuts that cutting edge rust after screw rod is used for a long time is difficult to be found that product quality can be influenceed and screw rod exchanges relatively difficult in addition；Although two be that the rotating speed for adjusting extruder screw can measure the addition of fiber but screw extruder technological parameter can be influenceed to be difficult to take into account the relation between fiber addition and optimal procession parameters.

The technical problems to be solved by the invention are the continuous fiber customized cut-off method and apparatus for providing a kind of continuous accurate measurement, and continuous fiber can be carried out to cut off and accurate measurement.

The present invention solves above-mentioned technical problem and adopted the technical scheme that：

The continuous fiber customized cut-off method of continuous accurate measurement, it is characterized by, rotation hob type cutting machine is provided, continuous long fibre, servomotor, detect long stapled sensor and control system, the continuous fiber of shared plural number stock enters rotation hob type cutting machine after sensor, sensor detection cuts off machine travel by rotation hob type and waits to enter the long fibre number of share of stock of rotation hob type cutting machine, the number of share of stock transducing signal of acquisition is compared by control system differentiate after the control signal of corresponding adjustment rotating speed passed into servomotor according to the certain mode of the fixed length chopped strand total amount after cut-out, and the rotating speed of rotation hob type cutting machine is accurately adjusted by external servomotor, fixed length chopped strand after cut-out enters extrusion machine inlet.

The continuous fiber fixed-length cutting device of continuous accurate measurement, for the extrusion molding of direct-on-line long fiber reinforced thermoplastic composites, it is characterized by：Described shearing device is located on the feedstock direction of continuous fiber, for rotation hob type cutting machine, and the rotating speed of rotation hob type cutting machine is accurately adjusted by external servomotor, fixed length chopped strand after cut-out enters extrusion machine inlet, shared plural number section chief's fiber, to detect the whether stranded sensor of long fibre be located at shearing device before feedstock direction on, sensor signal output end is electrically connected with control system signal input part, control system signal output part is electrically connected with the control end of servomotor, sensor detection cuts off machine travel by rotation hob type and waits to enter the long fibre number of share of stock of rotation hob type cutting machine, the number of share of stock transducing signal of acquisition is compared by control system differentiate after the control signal of corresponding adjustment rotating speed passed into servomotor according to the certain mode of the fixed length chopped strand total amount after cut-out.

So, accurate measurement accurate feeding is realized, and does not influence the work of extruder.

The present invention carries out customized cut-off to continuous fiber in advance outside extruder using rotation hob type cutting machine and carries out accurate measurement to fiber content by adjusting the rotating speed of high-precision servo motor, subsequently into charging aperture and the melt mixture of extruder.

Servomotor is also known as operating motor, in automatic control system, and as executive component, the angular displacement or angular speed that the electric signal received is converted on motor reel are exported.Servo is positioned mainly by pulse, because servomotor possesses the function of sending pulse in itself, and the pulse of respective amount can all be sent by often rotating an angle, it becomes possible to the rotation of motor is accurately controlled very much, so as to realize accurate positioning.

Apparatus of the present invention metering section changes tradition and weighs metering method, is measured using control axle rotational speed, uses servomotor to improve precision power motor, greatly improves measuring accuracy.

The purpose of the present invention can also be realized by following approach.

Rotating hob type cutting machine includes rotor and rubber roll, and long fibre tangentially enters and in gap of the clamping between rotor and rubber roll.

The rotor driven by servomotor to rolling with rubber roll by that can draw long fibre.

The rotation hob type cutting machine includes rotor, pressure roller, rubber roll, the first pressue device and the second pressue device, rotor, pressure roller, rubber roll are in angular distribution each other, its mid-rubber roll is respectively with pressure roller, rotor to rolling, continuous fiber first passes through the gap of pressure roller and rubber roll, rotor is reached again and rubber roll gap cuts into chopped strand by hobboing cutter, first pressue device controls the pressure between pressure roller and rubber roll, the pressure between the second pressue device control rotor and rubber roll.

Second pressue device and the first pressue device are used as executive component using cylinder.

Hobboing cutter cutter tooth is designed along rotor roll surface Spiral distribution into a kind of helical gear helical teeth.

The cutter tooth of helical teeth design can realize that not only corresponding reduction cut-out torque, also makes cut-out steady without easily stranded to per share long stapled cut-out.

The rotation hob type cutting machine, which also includes, is provided with a plurality of guide eyelits on yarn guide, yarn guide, per share long fibre is corresponded and is set in guide eyelit, has a plurality of sensors one-to-one corresponding and is configured with guide eyelit.

The servomotor is rotated by gearbox driving rotation hob type cutting machine.

The chopped strand that the melt and cut-out that the extrusion neck ring mold from the first rank screw extruder is extruded are formed enters the charging aperture of second-order screw extruder, described shearing device is located at the top that wind rectification preheats blanking pipe of pulling out at the charging aperture, the extrusion neck ring mold of the first described rank screw extruder is communicated with pulling out wind rectification preheating blanking pipe, and the waste heat of second order screw rod extruder is discharged into the blanking pipe.

Device is placed in second-order extrusion machine inlet upper end, and precision cut flock is directly entered charging aperture by the wind turning rectification preheating blanking pipe of customization and saves conventional vibration formula dosing feeder, and investment is less.

The beneficial effects of the invention are as follows：

1st, fibre length is advance artificial Length Control, both ensure that the maximum length of fiber, and had been conducive to mobility of the product in mold process again；

2nd, after the function of eliminating the cutting of extruder screw glass, the length for making extruder compounding process only be responsible for fiber is kept and fiber is evenly distributed, and screw rod function adjustment purpose is more clear and definite, and screw rod adjustment is more simple；

3rd, because fiber is added, metering is unrelated with screw speed, is more easy to the optimised process requirement for making screw speed meet mixture and extrusion；

4th, pre- precision cut flock is preheated easily disperses in the melt with melt mixture compared with continuous fiber again, and infiltration of the melt to fiber is more preferable；

5th, continuous fiber fixed-length cutting device is set outside extruder, is easy to find the replacement of tool wear and abrasion cutter in time, and m of e is more convenient；

6th, accurate measurement accurate feeding is realized.

Fig. 1 is main structure diagram of the invention.

Fig. 2 is the side structure schematic view of the embodiment of the present invention 1.

Fig. 3 is the structural representation for rotating hob type cutting machine in preferred embodiment.

Fig. 4 is Fig. 3 A direction views.

Label declaration in accompanying drawing

1- continuous fibers 2- rotates hob type cutting machine 3- blanking pipes

4- chopped strand 5- screw rod 6- servomotors

7- gearbox 8- second-order screw extruder 9- melts.

The guide eyelit of 21 rubber roll, 22 pressure roller, 23 rotor, 24 first 25 second pressue device of pressue device, 26 yarn guide 261

Embodiment

Embodiment 1：

Refer to shown in Fig. 1 and Fig. 2, a kind of continuous fiber fixed-length cutting device of continuous accurate measurement, extrusion molding for direct-on-line long fiber reinforced thermoplastic composites, wherein, described shearing device is located on the feedstock direction of continuous fiber 1, to rotate hob type cutting machine 2, and the rotating speed for rotating hob type cutting machine is adjusted by external servomotor 6 and gearbox 7.

The chopped strand 4 that the melt 9 and cutting extruded from the extrusion neck ring mold of the first rank screw extruder are formed enters the charging aperture of second-order screw extruder 8, mixture extrusion is carried out by screw rod 5, described shearing device is located at the top that wind rectification preheats blanking pipe 3 of pulling out at the charging aperture, the extrusion neck ring mold of the first described rank screw extruder is communicated with pulling out wind rectification preheating blanking pipe 3, the waste heat of second order screw rod extruder, including the first rank screw extruder melt extrusion 9 distribute waste heat and the charging aperture cylinder of second-order screw extruder 8 distribute waste heat, it is discharged into the blanking pipe 3.

The continuous fiber customized cut-off method of continuous accurate measurement, rotation hob type cutting machine is provided, continuous long fibre, servomotor, detect long stapled sensor and control system, the continuous fiber of shared plural number stock enters rotation hob type cutting machine after sensor, sensor detection cuts off machine travel by rotation hob type and waits to enter the long fibre number of share of stock of rotation hob type cutting machine, the number of share of stock transducing signal of acquisition is compared by control system differentiate after the control signal of corresponding adjustment rotating speed passed into servomotor according to the certain mode of the fixed length chopped strand total amount after cut-out, and the rotating speed of rotation hob type cutting machine is accurately adjusted by external servomotor, fixed length chopped strand after cut-out enters extrusion machine inlet.

The not described part of the present embodiment is same as the prior art.

Most preferred embodiment：

Reference picture 1, Fig. 3, Fig. 4, the continuous fiber fixed-length cutting device of continuous accurate measurement, for the extrusion molding of direct-on-line long fiber reinforced thermoplastic composites, it is characterized by：Described shearing device is located on the feedstock direction of continuous fiber, for rotation hob type cutting machine 2, and the rotating speed of rotation hob type cutting machine is accurately adjusted by external servomotor, fixed length chopped strand after cut-out enters extrusion machine inlet, the continuous long fibre 1 of shared plural number stock, to detect the whether stranded sensor of long fibre 1 be located at shearing device before feedstock direction on, sensor signal output end is electrically connected with control system signal input part, control system signal output part is electrically connected with the control end of servomotor, sensor detection is drawn by rotation hob type cutting machine 2 and waits to enter the long fibre number of share of stock of rotation hob type cutting machine 2, the number of share of stock transducing signal of acquisition is compared by control system differentiate after the control signal of corresponding adjustment rotating speed passed into servomotor according to the certain mode of the fixed length chopped strand total amount after cut-out.

Rotating hob type cutting machine includes rotor 23, pressure roller 22, rubber roll 21, the first pressue device 24 and the second pressue device 25, rotor 23, pressure roller 22, rubber roll 21 are in angular distribution each other, its mid-rubber roll 21 is rolled with pressure roller 22,23 pairs of rotor respectively, continuous fiber 1 first passes through the gap of pressure roller 22 and rubber roll 21, rotor 23 is reached again and the gap of rubber roll 21 cuts into chopped strand by hobboing cutter, first pressue device 24 controls the pressure between pressure roller and rubber roll, the pressure between the second pressue device 25 control rotor and rubber roll.The rotor 23 driven by servomotor to rolling with rubber roll 21 by that can draw long fibre 1.

First pressue device 24 and the second pressue device 25 are used as executive component using cylinder.

Reference picture 4, hobboing cutter cutter tooth is designed along the roll surface Spiral distribution of rotor 23 into a kind of helical gear helical teeth.

Rotation hob type cutting machine 2, which also includes, is provided with a plurality of guide eyelits 261 on yarn guide 26, yarn guide, per share long fibre is corresponded and is set in guide eyelit 261, and shared a plurality of sensors are corresponded to be configured with guide eyelit 261.

The not described part of the present embodiment is same as Example 1.

Claims

The continuous fiber customized cut-off method of continuous accurate measurement, it is characterised in that rotation hob type cutting machine is provided（2）, continuous long fibre, servomotor (6), detect long stapled sensor and control system, the continuous fiber for having plural number stock enters rotation hob type cutting machine after sensor, and sensor is detected by rotation hob type cutting machine（2）Draw and wait to enter rotation hob type cutting machine（2）Long fibre number of share of stock, the number of share of stock transducing signal of acquisition is compared by control system differentiate after the control signal of corresponding adjustment rotating speed passed into servomotor (6) according to the certain mode of the fixed length chopped strand total amount after cut-out, and the rotating speed for rotating hob type cutting machine is accurately adjusted by external servomotor (6), the fixed length chopped strand after cut-out enters extrusion machine inlet.
The continuous fiber fixed-length cutting device of continuous accurate measurement, the extrusion molding for direct-on-line long fiber reinforced thermoplastic composites, it is characterised in that：Described shearing device is located at continuous fiber（1）Feedstock direction on, for rotation hob type cutting machine（2）And the rotating speed for rotating hob type cutting machine is accurately adjusted by external servomotor (6), fixed length chopped strand after cut-out enters extrusion machine inlet, shared plural number section chief's fiber, to detect the whether stranded sensor of long fibre be located at shearing device before feedstock direction on, sensor signal output end is electrically connected with control system signal input part, and control system signal output part is electrically connected with the control end of servomotor (6), and sensor is detected by rotation hob type cutting machine（2）Draw and wait to enter the long fibre number of share of stock of rotation hob type cutting machine, the number of share of stock transducing signal of acquisition is compared by control system differentiate after the control signal of corresponding adjustment rotating speed passed into servomotor (6) according to the certain mode of the fixed length chopped strand total amount after cut-out.
The continuous fiber fixed-length cutting device of continuous accurate measurement according to claim 2, it is characterised in that described rotation hob type cutting machine (2) includes rotor, pressure roller（22）, rubber roll（21）, the first pressue device（24）With the second pressue device（25）, rotor（23）, pressure roller（22）, rubber roll（21）It is in angular distribution, its mid-rubber roll each other（21）Respectively with pressure roller（22）, rotor（23）To rolling, continuous fiber first passes through pressure roller（22）And rubber roll（21）Gap, then reach rotor（23）And rubber roll（21）Gap cuts into chopped strand (4), the first pressue device by hobboing cutter（24）Control pressure roller（22）And rubber roll（21）Between pressure, the second pressue device control rotor（23）And rubber roll（21）Between pressure.
The continuous fiber fixed-length cutting device of continuous accurate measurement according to claim 2, its feature is in described rotation hob type cutting machine (2) includes rotor（23）And rubber roll（21）, long fibre tangentially enters and clamping is in rotor（23）And rubber roll（21）Between gap in.
The continuous fiber fixed-length cutting device of continuous accurate measurement according to claim 2, it is characterised in that described rotation hob type cutting machine (2) also includes yarn guide（26）, yarn guide（26）On be provided with a plurality of guide eyelits（261）, per share long fibre corresponds and is set on guide eyelit（261）In, have a plurality of sensors and correspond and guide eyelit（261）Configuration.
The continuous fiber fixed-length cutting device of continuous accurate measurement according to claim 2, it is characterised in that described servomotor (6) is rotated by gearbox (7) driving rotation hob type cutting machine (2).
According to claim The continuous fiber fixed-length cutting device of continuous accurate measurement described in 2, characterized in that, the chopped strand (4) that melt (9) and cut-out that the extrusion neck ring mold from the first rank screw extruder is extruded are formed enters the charging aperture of second-order screw extruder (8).
According to claim The continuous fiber fixed-length cutting device of continuous accurate measurement described in 2, it is characterised in that described shearing device is located at the top for pulling out wind rectification preheating blanking pipe (3) at the charging aperture.
According to claim The continuous fiber fixed-length cutting device of continuous accurate measurement described in 2, it is characterized in that, the extrusion neck ring mold of the first described rank screw extruder is communicated with pulling out wind rectification preheating blanking pipe (3), and the waste heat of second order screw rod extruder is discharged into the blanking pipe (3).