SU1449908A1 - Apparatus for monitoring the elastic and strain characteristics of filament being rewound - Google Patents

Abstract

The invention relates to the textile industry, namely to materials science, to the section on the radiation of the elastic-deformation characteristics of threads. The purpose of the invention is to reduce the monitoring time by combining the monitoring process with the rewinding process without disrupting its integrity in bobino. This goal is achieved in that the device uses two pairs of moving and stationary guide rollers and an electromagnetic clip with shaped protrusions on its moving part to form a closed contour passed through the device thread. Movable rollers are connected to the lever. a hinge mechanism and a force meter for stretching the closed loop of the thread during measurement. The rewinding mechanism is electrically qc zan with an electromagnetic clamp and a loading mechanism. Moreover, the ratio of the shoulders of one of the levers, interacting with the loading mechanism, is 1: 3. 4 il. sh (l

Description

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The invention relates to the textile industry, namely to material science, to the section on the study of the elastic-strain characteristics of filaments.

The purpose of the invention is to reduce the monitoring time by combining the monitoring process with the rewinding process without disturbing the integrity of the thread in the reel.

Figure 1 shows the structural diagram of the proposed device and type A; Figs 2 and 3 show the forces acting on the levers of the lever-hinge mechanism; on the diagram of the movement of the elements of the device.

The device (FIG. 1) contains upper 1 and lower 2 movable guide rollers and two fixed rollers 3 and 4 for passing the threads 5 through them from the reel 6 to the reel 7, the electromagnetic clamp 8 consisting of the fixed block 9 movable with figured protrusions 10, rigidly connected with a ferromagnetic core 11 interacting with coil 12, the force meter 13 consists of an axon-solo-fixed beam 14 that is jointly connected to the upper roller 1, the movable support 15j of the electric drive 16 of its movement with the coded screw hom 17, Lower roller 2 fortified on an arm 18 hinged lever-mehaniz1449908 2

The device works as follows

The initial position of the device is (FIG. 1) a movable support 15 c. in any position, the arresting device 33 locks the lever-hinge mechanism in the neutral position, leaving both pairs of contacts 29 and 30 open; The electromagnet clamp 8 is open and freely passes a thread 5 between its pads, the loading mechanism is in the upper position, the weight 24 lies on the pin x 25, and the load grommet 23 is free.

On a command from a software-controlled device (not shown), the mechanism for moving the thread 5 from the reel 6 to the reel 7 with a given speed and given by the number and time stops to perform the measurements is turned on. When the rewinding mechanism is stopped, the electromagnet coil is turned on and the electromagnetic clamp is activated, closing the ram (from the reel 6) and converging (on the reel 7) thread branches between the stationary 9 and the movable with figured projections 10 pads, thus forming

30 closed filament K9nur passing (fig. 1, view A) from point a through roller 1 and 2 to point b (figured protrusions are shown by dashed lines) “Immediately after running the electromagnet ia 9 consisting of the named lever. The clip 8 clamp arrests 33 frees up ha 18, upper arm 20 and pull rod 21, a lever-hinge mechanism and an articulated connecting ir, and interacts the drive of the loading mechanism with the loading mechanism 22, 22, while the load 24 s given by the speed of: the rest of the cargo section of board 23, is placed on the cargo bay 24, three pins 25, which have the possibility of vertical movement from the lead screw 26 through the gear; iapy from the electric drive 27. On the top; Lever 20 strengthened contact bracket

23, as a result of which the specified contour of the thread section lengthens under the effect of tensile force from the load 24, and one of the pairs of contacts (29 or 30) closes, including

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.8 with the upper pair 29 and the lower pair the propulsion drive actuator 16

30 contacts that can interact with the beam 14.

For visual reading of the measured value, a scale 31 with a pointer 2, rigidly mounted on the mobile Support 15, is provided for the support of the support 15 with the reohord to provide an automatic recording of measurement on the recording device (not specified). arresting device 33 for fixing the lever-hinge mechanism in the neutral, 1st position.

15,

There are two possible ways to continue working. In the first case, the upper pair of contacts 29 is closed (this means that the force arising in the thread is not enough for the elastic counteraction that arises in the beam to open the contacts). As a result, the actuator 16 through the closed pair 29 is turned on to move the support to the left, t, e, to decrease the rigidity of the beam. In the second case, the lower pair 30 will be closed and the actuator 16 will turn on the wide clamp 8 and the arrester 33 will release the lever-hinge mechanism and will turn on the loading mechanism mechanism 22, the load 24 with a given speed stacked on the cargo area

23, as a result of which the specified contour of the thread section lengthens under the effect of tensile force from the load 24, and one of the pairs of contacts (29 or 30) closes, including

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motor 16 movement support

motor 16 movement support

15,

There are two possible ways to continue working. In the first case, the upper pair of contacts 29 is closed (this means that the force arising in the thread is not enough for the elastic counteraction that arises in the beam to open the contacts). As a consequence, the drive 16 through the closed pair 29 is turned on to move the support to the left, t, e, to decrease the rigidity of the beam.

1f

 ,

T.e.,

where n1 is the elongation of the test section of the thread — its two branches — while conditionally we assume that the sections of the thread lying on the rollers do not undergo elongation.

If “to mark the stiff of a beam, then its deflection

f c / Qo (1)

On the other hand, the elongation of the thread

(2)

41 I1

Where

from moving the support 15 to the right, i.e. to increase the rigidity of the beam. In both cases, the support 15 moves until both pairs of contacts 29 and 30 are open, the support 15 stops, the force disappears in t 21, and the pointer 32 shows on the scale 31 the value of the deformed stiffness about the portion of the thread under investigation. Subsequently, during the relaxation of the force in the test section of the filament, the force meter automatically ensures the open position of both pairs of contacts, and the pointer 32 shows the change in the deformed stiffness with time on a scale of 31. After the programmed time has elapsed, the load 24 is removed from pad 23, the lever-hinge mechanism is arrested, the electromagnetic clamp is opened, and rewinding is started before the next measurement.

The connection of the deformation stiffness of the sample 25 and the stiffness of the beam can be clarified by considering the equilibrium conditions of the levers 18 and 20 under the action of the forces applied to them under the pressure of the part under study.

thread and its elongation. On the lever 20

are valid force (figure 2): R - reaction

in the basic hinge; N - force in the thread;

Q is the elastic force arising in the beam during its deflection; T - effort in

t ge 21 o

Equilibrium equation of lever 20: (Q - 2N) with

The lever 18 is acted upon by forces (Fig. 3): K j is the reaction in the support hinge; N - force in the thread; T - effort in t ge 21; P - the mass of the load 24.

Equilibrium equation of lever 18:

(2N-P) 3 T with P 2N.

1 - the length of the investigated area E - relaxation module; F is the cross-sectional area of the thread

But since i), then equating (1) and (2), we obtain

cTQ

 Y; y

Thee

f at

35

40

The strain stiffness of the thread is equal to the stiffness of the beam. Since during testing the elongation of the thread is no more than 1-2%, the value of l / F can be assumed to be constant and then

/ C Consequently, at T o,. Next, consider the elongation of the investigated area of the thread (figure 4). Under the action of load P, both levers 18 and 20 are rotated relative to the support hinges; the movement of the left end of the upper lever 20 (equal to the deflection of the beam) will be f 2 A, and the movement of the left end of the lower lever 18 (equal to the value of movement of roller 2 ) will be equal to the stiffness of the beam - the function of its departure, which implies the dependence of the deformation stiffness of the thread

  The position of the support, which determines the departure, is what allows graduation of the scale according to the position of the mobile support.

The use of the proposed device provides, in comparison with the known, the advantage consisting in the fact that by means of direct measurements the elastic deformation characteristic — deformation a50 — is controlled.

-irirxc. roller shifting) will be equal to the characteristic - defor Hof, 3A, where A is the displacement of the pulley 21, the rational stiffness of the thread most connecting the levers (due to the smallness, it is completely consistent with the nature of the movements of the arc are replaced by straight sections), Hence the increase in distance neither

mechanical impacts during operation and processing, without interleaving the axes of the upper and lower rollers.

1f

 ,

T.e.,

where n1 is the elongation of the test section of the thread — its two branches — while conditionally we assume that the sections of the thread lying on the rollers are not subject to elongation.

If “denote the stiffness of the beam, then its deflection

f c / Qo (1)

On the other hand, the elongation of the thread

(2)

41 I1

Where

1 - the length of the study area; E - relaxation module; F is the cross-sectional area of the thread

But since i), then equating (1) and (2), we obtain

cTQ

 Y; y

Thee

f at

35

The strain stiffness of the thread is equal to the stiffness of the beam. Since during testing the elongation of the thread is no more than 1-2%, the value of l / F can be assumed to be constant and then

40

/ С But the rigidity of the beam is a function of its departure, whence the dependence of the deformation stiffness of the thread

  The o-° position of the support, which determines the departure, which makes it possible to calibrate the scale according to the position of the mobile support.

The use of the proposed device provides, in comparison with the known, the advantage consisting in the fact that by means of direct measurements the elastic deformation characteristic — deformation a50 — is controlled.

 Matrix characteristic - deformation stiffness of the thread, most fully consistent with the nature

Matrix characteristic - deformation stiffness of the thread, most fully consistent with the nature

mechanical effects during operation and processing, without violating the integrity of the thread in the reel during its rewinding

Claims (1)

Formula invented and Device to control the elastic. deformation characteristics of the thread when it is rewound, containing a meter in the form of a cantilever-fixed elastic beam with a support that is disposed with the possibility of movement along the beam, a lever-hinged mechanism of two parallel unequal arms and hinged connecting them, a contact bracket mounted on one of the levers with a shoulder ratio of 1: 2 and adapted to interact with the beam; a loading mechanism arranged to interact with the second lever, characterized in that pour contraction control time ten 14499086 By combining the control process with the rewinding process without destroying the integrity of the thread in the reel, it is additionally equipped with two P9 Movable rollers for passing through them the threads, one of which is pivotally connected to the beam of the load cell, and the other roller is fixed on the rotor of the lever of the hinge mechanism, an electromagnetic clamp located between the movable rollers, the movable part of which is provided with figured protrusions to form a closed loop of the thread, two fixed guide rollers arranged on both sides of the electromagnetic clamp, and also equipped with a thread rewinding unit, electrically connected with the electromagnetic clamp and loaded mechanism, with the ratio of the shoulders of the second lever 1: 3 15 31 -DtzziizziizrK ; 5 TSY iJ 111111111111 (IГ PW / i x / / l / T I / - / J 28 3 2 / 3 Yu five g ± ЖШ -27 yy Fig.Z TOVf (U Off 1,49908 1 21 J Соо / 7 / оше1 / е ffb / voeoiO-r.-z, Pbit / aea fS-f-j.