EP1251198A1 - Dispositif d'aspiration de particules dans des machines textiles et procédé de sa surveillance - Google Patents

Dispositif d'aspiration de particules dans des machines textiles et procédé de sa surveillance Download PDF

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Publication number
EP1251198A1
EP1251198A1 EP01106394A EP01106394A EP1251198A1 EP 1251198 A1 EP1251198 A1 EP 1251198A1 EP 01106394 A EP01106394 A EP 01106394A EP 01106394 A EP01106394 A EP 01106394A EP 1251198 A1 EP1251198 A1 EP 1251198A1
Authority
EP
European Patent Office
Prior art keywords
temperature
signal
pipe
point
evaluation unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01106394A
Other languages
German (de)
English (en)
Inventor
Torsten Schöne
Thomas Bethke
Rainer Bongratz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Protechna Herbst GmbH and Co KG
Original Assignee
Protechna Herbst GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Protechna Herbst GmbH and Co KG filed Critical Protechna Herbst GmbH and Co KG
Priority to EP01106394A priority Critical patent/EP1251198A1/fr
Publication of EP1251198A1 publication Critical patent/EP1251198A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/32—Devices for removing lint or fluff

Definitions

  • the invention relates to a textile particle suction device for Textile machines, in particular for circular knitting machines and a Method for monitoring such a device. Further The invention also relates to a circular knitting machine in which such a device is used.
  • Textile machines generate textile particles when different types. These particles can work severely impair the textile machine. Especially this is particularly pronounced in circular knitting machines, in particular Stocking machines. These machines create textile particles Leftover yarn, fluff and abrasion. As with circular knitting machines If the needles are particularly fine, there may be thread remnants or get lint in them, which ultimately leads to Major damage to the mechanics of the machine can result can.
  • a signal is first obtained which is from the temperature of the wall of a pipe through which in the undisturbed Condition air flows depending on. Based on this signal using an evaluation unit determines whether the device works undisturbed.
  • the invention takes advantage of the fact that the air flowing through the tube is in temperature exchange with the pipe wall. Will the pipe clogged, less or no air flows on the pipe wall over and this affects their temperature.
  • the temperature of the tube wall is then particularly high Presence of air flow through the tube depending if specifically a temperature difference between the pipe wall and the Air is generated. It is conceivable to constantly close the pipe wall cool, the air flowing through then for heating would worry. It is technically easier to use the pipe wall to heat a heater. Then air flows on the Pipe wall over, it is cooled, d. H. the pipe wall will heated less than the heater would allow. If a malfunction then occurs, the pipe is blocked more or less, less or no air flows on the pipe wall over and the pipe wall gets warmer.
  • the pipe wall is separated from the heating device heated, e.g. B. constantly.
  • the evaluation unit detects this Temperature signal at different times and evaluates the Temperature over time.
  • the signal is the absolute temperature represents the pipe wall at a first position of the pipe.
  • the criterion used by the evaluation unit for the determination A malfunction can then consist in that the Temperature of the pipe wall (or the signal representing it) is compared with a predetermined threshold. exceeds the temperature or the signal the threshold value, so malfunction is detected.
  • the method can be further developed such that a second signal is obtained, which corresponds to the temperature, which is in a place other than the first position, and that the evaluation unit based on a comparison of the first and of the second signal determines whether the device is undisturbed is working.
  • the other location can be a second location on the pipe wall be thermally insulated from the first point of the pipe wall and is not heated by a heating element.
  • the other The location can also be outside the pipe, it becomes the Outside temperature recorded. It is preferably provided that the the other location mentioned above (i.e. the second location) upstream the first position is arranged and the measurement in both Cases as close as possible to the inside of the pipe wall. As a result, temperature fluctuations in the environment, z. B. compensated for by starting the machine become.
  • the heating device heats the pipe wall at the first point in the simplest case constantly, so the evaluation unit can first signal or both signals at different times record, at these times, the comparison between the perform the first and the second signal and thus the time course evaluate.
  • the time derivative in particular in the evaluation unit (the differential") of the measured temperature as Function of time for the detection of trouble-free To evaluate operations.
  • the differential determines a particularly advantageous embodiment the time derivative of the Temperature difference between the first (heated) and the second place. With undisturbed operation of the textile particle suction device the temperature is stabilized in the first place, and the temperature also remains in the second place constant or when the ambient temperature changes both temperatures increase equally. So that is Time derivative of the temperature difference equal to zero. If the time derivative exceeds a predetermined one Threshold, it means a sudden change in the Temperature difference, which usually only arises from that the air flow is interrupted or disturbed. Exceeding the threshold value therefore shows the malfunction on.
  • the first signal was representative of the process absolute temperature of the pipe wall at the first position. to Determining a temperature difference required one second signal.
  • the only signal that is to say the first signal
  • the only signal that is to say the first signal
  • the temperature difference between the first digit and is played in another location For example, this is the case when a thermocouple is used, the Ends in the first place and the other place.
  • a resulting thermal voltage is a signal that shows the temperature difference represents.
  • thermocouple the ends of which are in the first place or the other place lie.
  • the thermocouple i.e. the temperature sensor
  • the thermocouple for the second signal in the airflow upstream with respect to arranged the temperature sensor for the first signal.
  • an alarm device can be used by the operator inform (acoustically and / or optically) or it can, e.g. B. if the evaluation unit is a special shows strong disturbance, i.e. a particularly high threshold as a criterion is exceeded, the textile machine automatically be switched off.
  • a textile particle suction device provided for textile machines, by which a method according to the invention can be carried out.
  • the invention has Device a temperature sensor that the temperature at a first place of a pipe through which in undisturbed operation Air flows, measures, as well as an evaluation unit that measures the measured Evaluates temperature (based on a specified criterion) and thus determines if the operation of the device is undisturbed or is disturbed.
  • the first point of the tube is preferably heated, namely by means of a heating device, for example an um the corresponding part of the coiled heating wire.
  • the temperature increase thus generated can be in the range of some Degrees Celsius move.
  • a second temperature sensor provided the temperature at a second Location of the tube measures, the second location of the tube being thermal essentially decoupled from the first position of the tube (isolated), and the evaluation unit also the Evaluates the temperature at the second point of the pipe, d. H. of the second temperature sensor as well as the first temperature sensor Receives signals.
  • the two tube parts explained above are preferably (Pipe sections) in terms of dimensions, shape and material designed the same or at least approximately the same, since on this Way the effect of interference by a comparison method can be reduced.
  • the pipe should be as possible be thin.
  • the thermal decoupling can be such that the first digit and the second digit on pieces of pipe from z.
  • the pipe section where the first position is is preferably designed so that it has the lowest possible heat capacity has (per unit length), so that if the Air flow the temporal temperature differential large values reached. If the pipe piece is made of brass, you can this e.g. thereby achieve that the pipe section has a diameter from 0.5 to 2.5 cm and a tube wall thickness from 0.2 to 0.5 cm.
  • the temperature of the pipe sections is not affected by external air currents is influenced, they are generally preferred by one Protection tube surrounded and thermally insulated.
  • the space between the protective tube and the pipe sections can be filled with air, is preferably potted with silicone.
  • the evaluation unit designed to measure the difference between the two Determine and evaluate temperatures.
  • the temperature sensors can be thermocouples. Thermocouples give an analog Signal off.
  • the evaluation unit then preferably comprises one Analog-to-digital converter and a microprocessor, the real one Evaluation is therefore carried out digitally in the microprocessor.
  • Evaluation units are suitable for the temporal course to record and evaluate each measured temperature and in addition in particular the derivation of the difference between to calculate and evaluate the two temperatures.
  • a textile machine comprises in particular a circular knitting machine, an inventive one Textile particle suction device, the on state the textile machine can be controlled by the evaluation unit is.
  • the microcontroller in the evaluation unit can, for example via a cable (or infrared, ultrasound, or similar) give a signal to the on-off switch of the textile machine.
  • the evaluation unit received a signal from the textile machine which indicates whether the machine is e.g. B. in a working or Hibernation or a signal to what extent the suction explained above is activated.
  • This Signal can have an adjustable effect Period of time to be delayed to non-stationary states of the Hide machine.
  • a measuring device 10 shown in FIGS. 1 and 2 can be in a textile particle suction device for a textile machine be installed, especially in a pipe in one Such suction device can be installed or on a such can be scheduled, or it can be done entirely replace.
  • the air extracted by pumps then flows through the Operation of the suction device through four pipe sections 12, 14, 16 and 18, of which the pipe sections 12 and 16 are made of brass and the pipe pieces 14 and 18 made of plastic. The latter can be from be cut off with a plastic tube.
  • the suction pipe is only shown for a short distance. It understands yourself that the pipe section 18 can be much longer and too a suction pump.
  • the pipe section 12 can also be essential be longer than shown; it leads to the critical point the textile machine (not shown) on which the textile particles should be suctioned off.
  • thermocouple 22 At a first location 20 is an end of a thermocouple 22 attached to the pipe section 16. At a second point 24 correspondingly a second thermocouple 26 on the pipe section 12 attached.
  • the first digit 20 and the second digit 24 are thermally insulated from each other because the pipe section 14 as Plastic hose is poorly heat-conducting.
  • the first pipe section 16 is heated by means of a heating winding 28, which is supplied with current via connections 30 and 32.
  • the thermocouple 22 then outputs a thermal voltage that corresponds to the temperature T 1 of the first, heated pipe section 16, while the thermocouple 26 outputs a voltage that corresponds to the temperature of the second pipe section 12. So that these two temperatures are not influenced by air currents flowing past the pipe sections on the outside, the pipe sections 14, 16 and 18 are at least largely surrounded by a protective tube 34.
  • the interior 36 between the wall of the protective tube 34 and the tube pieces 12, 14, 16 and 18 is potted with silicone, so that the entire element 10 is very stable.
  • a small part of the pipe section 12 protrudes from one end of the device 10.
  • This open pipe section 12 can be inserted directly into the suction hose of a textile machine.
  • the opposite piece of hose 18 can be plugged onto the coupling piece of the suction hose.
  • the entire measuring device 10 can, however, be arranged anywhere in the textile particle suction device, in which case further tubes can be attached to the tube pieces 12 and 18.
  • the measuring device 10 works as follows:
  • thermocouple 22 measures a thermal voltage that is dependent on the temperature at the first location 20 and the thermocouple 26 measures a thermal voltage that is dependent on the temperature at the second location 24.
  • the thermal voltages are passed through low pass filters (not shown) to suppress noise and interference. They are then fed to an analog-to-digital converter (not shown), which outputs a digital signal corresponding to the thermal voltage to a microprocessor (not shown).
  • Both ⁇ T and its time derivative are continuously monitored in the microprocessor. If the derivative suddenly differs from zero and exceeds a threshold value dependent on L / ⁇ T, this means that the air flow flows weakly or no longer through the measuring device 10, which means an accident. Instead or in addition, it can serve as a criterion that the accident has occurred when ⁇ T has exceeded a certain threshold value, which is naturally slightly above ⁇ T ⁇ , because if the air flow fails, the temperature difference due to the heating of the pipe section 16 is increased by the heating element 28 ,
  • the microprocessor detects that a malfunction has occurred, so he gives z. B. a signal to a control device (not shown) the textile machine so that it is switched off becomes. This prevents textile particles such as yarn residues, Lint and abrasion damage the textile machine.
  • the measuring device 10 described above has in particular the Advantage that the response time in the event of a total failure is very short, The textile machine is switched off within 15 seconds. Furthermore, the essential measuring elements are outside the pipe sections arranged so that the air flow through the measurement is not is hindered, in particular there are no installations on which lint can settle.
  • the measuring device 10 is also very simple, so that the Costs per monitoring point are low.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
EP01106394A 2001-03-20 2001-03-20 Dispositif d'aspiration de particules dans des machines textiles et procédé de sa surveillance Withdrawn EP1251198A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01106394A EP1251198A1 (fr) 2001-03-20 2001-03-20 Dispositif d'aspiration de particules dans des machines textiles et procédé de sa surveillance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01106394A EP1251198A1 (fr) 2001-03-20 2001-03-20 Dispositif d'aspiration de particules dans des machines textiles et procédé de sa surveillance

Publications (1)

Publication Number Publication Date
EP1251198A1 true EP1251198A1 (fr) 2002-10-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113200416A (zh) * 2021-05-06 2021-08-03 威海凯能塑料制品有限公司 一种化纤丝的导丝器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2125255A1 (en) * 1971-02-17 1972-09-29 Zellweger Uster Ag Flow meter - using thermosensor in a null method circuit
EP0005218A2 (fr) * 1978-05-02 1979-11-14 Siemens Aktiengesellschaft Aspirateur de poussière équipé d'un dispositif de régulation de la vitesse de rotation du groupe moteur-ventilateur
US4339949A (en) * 1978-12-27 1982-07-20 Babcock-Bsh Ag Process and apparatus for the thermal measurement of mass flow
DE3121521A1 (de) * 1981-05-29 1983-01-05 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Vorrichtung zum foerdern von luft ueber filter an einer textilmaschine
DE3629559A1 (de) * 1985-11-16 1988-03-17 Schlafhorst & Co W Entstaubungsvorrichtung fuer textilmaschinen
EP0370162A2 (fr) * 1988-11-22 1990-05-30 Stec Inc. Méthode et appareil de mesure et de commande de débit de fluide

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2125255A1 (en) * 1971-02-17 1972-09-29 Zellweger Uster Ag Flow meter - using thermosensor in a null method circuit
EP0005218A2 (fr) * 1978-05-02 1979-11-14 Siemens Aktiengesellschaft Aspirateur de poussière équipé d'un dispositif de régulation de la vitesse de rotation du groupe moteur-ventilateur
US4339949A (en) * 1978-12-27 1982-07-20 Babcock-Bsh Ag Process and apparatus for the thermal measurement of mass flow
DE3121521A1 (de) * 1981-05-29 1983-01-05 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Vorrichtung zum foerdern von luft ueber filter an einer textilmaschine
DE3629559A1 (de) * 1985-11-16 1988-03-17 Schlafhorst & Co W Entstaubungsvorrichtung fuer textilmaschinen
EP0370162A2 (fr) * 1988-11-22 1990-05-30 Stec Inc. Méthode et appareil de mesure et de commande de débit de fluide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113200416A (zh) * 2021-05-06 2021-08-03 威海凯能塑料制品有限公司 一种化纤丝的导丝器

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