SU1143648A1 - Device for measuring fibrous sliver of preset mass - Google Patents

Abstract

A DEVICE FOR MEASURING A FIBER MOBILE TAPE, containing a linear mass density sensor, a computing unit, a unit of mass for the tape and an actuator, characterized in that, in order to improve the accuracy of the measurement, a belt speed sensor and a delay unit are added to it, and a computational the block consists of a pulse-width modulator, a calculator of the linear mass density of the tape at a fixed length of the tape section, a generator of the reference frequency, an And element and a counter, with the output A linear mass density sensor for a ribbon is connected via a pulse-width modulator to the first input of a linear density calculator; the second input is connected to the output of a belt transport speed sensor, and the output is connected to one input of an And element, another input connected to a reference frequency generator output. , and an output with a summing meter input, the other (the left input of which is connected to a mass setter, a tape, the meter output connected to the input of a delay unit, the control input of the latter is connected to code d tchika tape transporting speed, and output - with an actuator. 4: o 05 j ;: (x)

Description

The invention relates to devices for measuring a fiber tape of a predetermined weight and can be used in packaging and packaging lines for gyroscopic (medical, surgical, etc) cotton wool. A device for measuring a fiber tape of a given mass is known, which contains a sensor of linear density of the mass of the tape, a computing unit, a belt weight of the tape and an executive “f f mechanism IJ. A disadvantage of the known device is the error in measuring the linear density of the mass of the tape, which occurs when the speed of transportation of the tape changes, due to the need to reconcile the line capacities and technological equipment due to the change in the linear density of the tape mass produced last. The purpose of the invention is to increase the accuracy of measuring a tape of a given mass by taking into account the instability of the speed of the tape and controlling the mass of a piece of tape located in the lag zone determined by the distance between the measuring point and the place of separation of the measured piece of tape. The goal is achieved by the fact that the device containing the linear mass density sensor of the ribbon, the computing unit, the mass controller of the ribbon and the actuator are additionally introduced to the tape transport speed sensor and the delay unit, and the computing unit consists of a pulse width modulator Len-PL mass at a fixed length of the tape section, generator of the reference frequency, No counter element, while the output of the sensor is the linear density of the ribbon mass via a pulse-width modulus p is connected to the first input of the calculator of the linear mass density of the tape, the second input connected to the output of the speed sensor of transporting the tape and the output to one input of the element I, another input connected to the output of the reference frequency generator, and the output to the summing input of the counter whose other input is connected to the unit of mass of the tape, with the output of the counter connected to the input 48 of the delay unit, the control input of the latter connected to the output of the speed sensor for transporting the tape, and the output to the actuator. Figure 1 shows the block diagram of the device; figure 2 is a functional diagram of the calculator linear density of the mass of the tape; FIG. 3 is a timing diagram of the linear mass density calculator for a portion of the tape. The linear mass density sensor 1 consists of a sensitive element, for example, in the form of slot pulleys, the movement of one of which is proportional to the change in the tape tape drive, with the inductance converter moving the movable roller in an electrical signal at the input of a computing unit consisting of a generator 2 of a reference frequency and a series-connected pulse-width modulator 3 of a calculator 4 linear This is the mass density of the part of the tape consisting of two triggers 5 and 6, inverter 7 and element 8 (FIG. 2). The clock input of the first trigger 5 is connected to the output of the sensor 9 of the belt transportation speed, the clock input of the second trigger 6 is connected to the output of the latitude pulse modulator 3 and through an inverter 7 with the first input of an And 8 element, the second input of the flip-flop 6 connected to the direct output, the inverse output of which is connected to the setup input of the flip-flop 5, the direct output of which is connected to the J input, and the inverse to the K input trigger 6, el And 10, the counter 11, and the input of the pulse-width modulator 3 is connected to the sensor 1 linear mass density of the tape, the second input element And 10 - with the generator 2 of the reference frequency, the second input of the counter And - with the unit 12 mass of the tape, and the output of the counter 11 is connected to a delay unit consisting of a series-connected trigger 13, an element 14, a second input connected to the output of a tape speed sensor 9 and a counter 15, the output of which is connected to actuator & 1 by mechanism 16. The device operates as follows. 3 The signal from the linear mass density sensor 1 is fed to a computing unit consisting of a generator 2 of the reference frequency and a serially connected pulse-width modulator 3, a calculator 4 of the linear density of the mass of the tape segment, element 10 and counter 11. The calculator 4 of linear density the mass of the tape section consists of two triggers 5 and 6, inverter 7, element I. At the first input, a signal is received from the sensor 9 of the transport speed of the tape, to a second input is a signal from the sensor 1 of the linear density of the ribbon mass. As a result, at the first output 3 of the calculator 4 of the linear mass density of a section of the tape, a sequence of pulses is formed (FIG. 3) with a frequency equal to the frequency of the pulses from the output of the sensor 9 of the belt transportation speed and a duration proportional to the linear mass density of the tape for every 0.25 cm tape lengths. The length of the quantization step of the linear mass density of the tape is 0.25 cm; it is chosen taking into account the maximum dynamic error not exceeding 1%. From the output of the element And 10, the information signal, filled with a high frequency generator 2 of the reference frequency, is fed to the input of the counter 11

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The GP 484 counts up to the number determined by the unit 12 of the belt mass, which determines the mass of the tape segment to be measured. From the output of the counter t1, the signal of the end of the counting enters the delay unit consisting of a trigger 13, which permits the passage of pulses from the sensor 9 of the speed of transporting the tape through the element 14 to the input of the counter 15, through the lag time determined by the passage time of the tape segment from the measurement zone to the cutting zone, the counter 15 is filled and the signal to control the actuator 16 and stop the conveyor is filled. This stops the flow of signals from the sensor 9 of the speed of transporting the tape to the input of the calculator 4 of the linear density of the mass of the tape segment. At the time of the next switching on of the production line conveyor, the measurement cycle begins anew. As a result of the implementation of the proposed device, which provides tape metering with a given accuracy of ± 8% for packings of 50 g, elimination of weight loss is achieved, which allows an increase in the actual output of lines of type LAHW by 1.32 times and yields an economic effect of 57.7 thousand roubles. on one device.

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Claims (1)

A DEVICE FOR MEASURING A FIBER-TAPE TAPE OF A PRESENT MASS, containing a linear mass density sensor of a tape, a computing unit, a tape mass adjuster and an actuator, characterized in that, in order to improve the measurement accuracy, a tape transportation speed sensor and a delay unit are additionally introduced into it , and the computing unit consists of a pulse-width modulator, a linear mass density calculator for a fixed length of a tape section, a reference frequency generator, an And element, and a counter, while the output of the sensor and the linear mass density of the tape through a pulse-width modulator is connected to the first input of the linear mass density calculator of the tape, the second input connected to the output of the tape speed sensor, and the output to one input of the element And, the other input connected to the output of the reference frequency generator, and the output with a summing counter input, the other input of which is connected to the mass master, tape, and the counter output is connected to the input of the delay unit, the control input of the latter is connected to the output of the speed sensor t ansportirovaniya tape, and the output - to the actuator. I