A kind of reaction type flexible material tenslator
Technical field
The utility model relates to a kind of flexible material tenslator, and especially a kind of reaction type flexible material tenslator of physical construction belongs to the thin or byssaceous material technical field of carrying.
Background technology
The flexible materials such as warp of general paper, cloth, fabric all have certain elasticity, and therefore in rolling with unreel and need to control its tension force in the process, elastic force is even along its length with the assurance material.At present, the flexible material tenslator totally can be divided into mechanical type and two kinds of forms of electromagnetic type, and wherein the electromagnetic type tenslator need to guarantee by testing agency and electric control system the tensile force of material, and the use and maintenance cost is higher; The mechanical tension control setup is widely used in the operating process of flexible material retractable volume with its simple in structure, easy to operate characteristics.
Publication number be CN1916256A's " a kind of tenslator " a kind of tenslator when being applicable to the uncoiling of silk fabrics production process Raw is disclosed, although it can guarantee that material tension force is near steady state value, but it is to cooperate with the circumferential recess of brake wheel by brake band to realize tension adjustment, because brake band is flexible material, and need its predetermincd tension of periodic adjustment, therefore also be provided with brake band tensioned mechanism and pretightening force controlling mechanism, exist the disadvantages such as amount of parts is many, complex structure.
The utility model content
The purpose of this utility model is the drawback for prior art, provide a kind of simple in structure, easy to operate, can satisfy the reaction type flexible material tenslator that control requires to the material tension force such as warp of paper, cloth, fabric.
Problem described in the utility model realizes with following technical proposals:
A kind of reaction type flexible material tenslator, it comprises brake disc, slipper, swing arm, arm shaft, adjusting knurl and adjusting wheel shaft, described brake disc is fixedly mounted on unreeling shaft one end of material unwinding equipment, brake disc and swing arm are equipped, described slipper is installed in the swing arm, described swing arm is hinged by the bracing frame of arm shaft and material unwinding equipment, and described adjusting knurl is installed in to be regulated on the wheel shaft, and described adjusting wheel shaft is fixed on the end of swing arm.
Above-mentioned reaction type flexible material tenslator, described swing arm is the double-arm lever structure take rocker shaft as fulcrum, the adjusting knurl that is installed in its master arm end be pressed on material above, be installed in slipper and the brake disc coupling of its slave arm end.
Above-mentioned reaction type flexible material tenslator, described brake disc outer rim is provided with the annular groove along circumferential arrangement.
Above-mentioned reaction type flexible material tenslator, described slipper driving surface are the arc surface that mates with brake disc outer rim annular groove bottom surface.
The utility model cooperates with the flexible material unwinding equipment, unreel in the process at flexible material, along with disturbance tension force increases, the swing arm moment balance state that is hinged on the material unwinding equipment bracing frame is destroyed, and the component that the swing arm master arm makes progress increases, and swing arm rotates counterclockwise around arm shaft, be fixed on the slipper of swing arm slave arm end and the pressure between the brake disc reduces thereupon, the suffered friction force of brake disc reduces, and the unreeling shaft rotating speed of material unwinding equipment increases, so that material tension force reduces.Guaranteed that by above-mentioned control process material tension force is near a certain steady state value all the time, satisfied flexible material and unreeled in the process requirement to tension force.The utility model has been received very satisfied result of use after the wet nonwoven towel manufacturing line is on probation.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is front view of the present utility model;
Fig. 2 is A-A sectional structure chart among Fig. 1;
Fig. 3 is fundamental diagram of the present utility model.
Each list of reference numerals is among the figure: 1, base, 2, bracing frame, 3, unreeling shaft, 4, brake disc, 4-1, annular groove, 5, material, 6, slipper, 7, arm shaft, 8, swing arm, 9, support wheel shaft, 10, support wheel, 11, regulate wheel shaft, 12, adjusting knurl, 13, Scroll, 14, material volume, 15 material volume core.
The specific embodiment
Referring to Fig. 1, Fig. 2, the utility model and flexible material unwinding equipment coupling, described flexible material unwinding equipment comprises the parts such as base 1, bracing frame 2, unreeling shaft 3, support wheel shaft 9, support wheel 10, Scroll 13 material volume 14 and material volume core 15, wherein, bracing frame 2 is fixed on the base 1, unreeling shaft 3, support wheel shaft 9 and Scroll 13 are fixed on the bracing frame 2, and material volume core 15 is fixed on the unreeling shaft 3 together with material volume 14, brake disc 4, and they can also can only rotate together.
Referring to Fig. 1, Fig. 2, the utility model comprises brake disc 4, slipper 6, swing arm 8, arm shaft 7, adjusting knurl 12 and regulates wheel shaft 11, described brake disc 4 is fixedly mounted on unreeling shaft 3 one ends of material unwinding equipment, brake disc 4 is equipped with swing arm 8, described slipper 6 is installed in the swing arm 8, described swing arm 8 is hinged with the bracing frame 2 of material unwinding equipment by arm shaft 7, and described adjusting knurl 12 is installed in to be regulated on the wheel shaft 11, and described adjusting wheel shaft 11 is fixed on the end of swing arm 8.
Referring to Fig. 3, principle of work of the present utility model is: when material 5 tension force were suitable, swing arm 8 was in balance position, and the friction brake force between brake disc 4 and the slipper 6 and the tension force of material 5 are in state of equilibrium; Unreel the increase of disturbance tension force in the process along with material, the swing arm moment balance state that is hinged on the material unwinding equipment bearing support 2 is destroyed, and material 5 holds up adjusting knurl 12, and rocking arm 8 is around arm shaft 7 counter-clockwise swings, the pressure between slipper 6 and the brake disc 4
F1Reduce, friction force reduces thereupon, and unreeling shaft 3 rotating speeds of material unwinding equipment increase, so that the tension force of material 5 reduces.Above-mentioned control process can be expressed as:
Otherwise:
This shows through above-mentioned feedback procedure, the tension force of material 5 is controlled on the constant numerical value.
The positive pressure that is equipped with between Moving plate 4 and the slipper 6 is
F1, swing arm 8 is in the situation that a gravitate, and the unbalanced moment of arm shaft 7 is M, obtains according to the moment balance relation:
Wherein
Be tension force at the component of arm shaft tangential direction,
fThe tension force of material.
Because unreeling shaft moves with uniform velocity, obtain according to the moment balance relation:
,
Wherein
kThe friction coefficient between brake disc and the slipper,
RThe radius of brake disc 4,
R 1 It is the radius of material volume 14.
Above two formulas of arrangement get:
Therefore, at angle
aNot in the very large situation
,
So
, the radius of material volume 14
R 1 For tension force
fImpact can ignore.
This shows, change the size (as shown in phantom in Figure 3, angle becomes α 1) that the position of regulating wheel shaft 11 can change angle [alpha], just can change tension force.When the position of regulating wheel shaft 11 immobilized, the size of material tension force also immobilized, and the utility model is regulated by the reaction type to material tension force according to above-mentioned principle of work, had realized permanent tension force control.