Classifications

• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/002—Avoiding starting marks
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/005—Independent drive motors
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/007—Loom optimisation

Definitions

• the present invention relates to a method for the controlled start-up of a weaving and shedding machine, wherein the loom is driven by a main drive, while the shedding machine is driven by means of an electromotive auxiliary drive.
• Such weaving and shedding machines are known.
• the shedding machine on a separate drive the central drive shaft, from which the movements of the shedding means are derived, is connected to an electric motor.
• These are those shedding machines in which the shedding means are decoupled from the movement of the central drive shaft, z. B. dobby type 2881 Stäubli or Jacquard machines type LX Stäubli or Sl the company Bonas.
• the drive shaft of the weaving machine from which the further movements (reed, possibly mechanical weft insertion elements) are derived, is in turn connected to at least one directly driving them, also usually designed as an electric motor actuator.
• Such direct drives are very simple in their mechanical design, virtually maintenance-free and very precisely adjustable.
• the drives of the loom and the shedding machine are connected by means of a common DC voltage intermediate circuit, hereinafter referred to as inverter intermediate circuit, so that they can form an energy flow with each other.
• DE 200 21 049 U1 as the closest prior art has for separate drives for weaving and shedding machine on the way out to make the known from DE 100 53 079 C1 preferred start of the shedding machine such that this is the subsequent start of the loom by supports their kinetic energy.
• the shedding machine is accelerated to a speed above the end of the loom start to be reached working speed.
• the shedding machine gives by the deceleration to their start support, ie during their start phase, kinetic energy from.
• the invention is therefore based on the object to reduce the peak power requirement of the weaving machine by better utilization of the kinetic energy recovery of the shedding machine, the process reliability should be ensured by maintaining the voltage limits in the converter intermediate circuit. Also, no deductions in the starting dynamics of the weaving machine must be taken into account.
• the method for starting up on the one hand, the startup of the shedding machine to a predetermined overspeed (hereinafter referred to as step 1) and on the other hand, the setting of the speed reduction of the shedding machine such that the gradient of the speed curve of the shedding machine is negative in a later stage of the start phase than in a earlier section (hereafter referred to as step 2).
• step 1 is that the overspeed to which the shed-forming machine is accelerated with respect to the working speed at the first sheet stop is predetermined in its value and / or upper limit, that is, exactly defined.
• the overspeed is calculated automatically at least on the basis of machine data, but preferably also based on process data. This will be discussed in more detail below.
• Step 2 provides for a time range t1 to t3, which advantageously completely includes or can coincide with the starting operation of t2 to t3 of the loom, for the speed of the shedding machine before a non-ramped course, ie one - starting with the overspeed Step 1 - non-constant gradient.
• the gradient curve is such that in a later period of the startup process the energy return is greater than in an earlier period of time. This means that the slowing down of the shedding machine does not take place uniformly (ramp-like) over the weaving machine start, but rather intensifies in a later section of the starting phase and preferably towards the end of the weaving machine start. As a result, the actual energy consumption of the weaving machine is taken into account, taking into account heat and other losses.
• the return of the energy or power is thus demand-adapted, d. H. especially when the demand from the starting weaving machine is strongest.
• the gradient of the speed curve of the shedding machine between the time t2 and a time t ' is less negative than the average time between the times t' and t3 in the time average.
• the gradient of the speed curve of the shedding machine at the end of the starting phase is more negative than in an earlier period of the start phase. This means that at the end of the starting phase more energy is fed back from the shedding machine to the weaving machine than at the beginning of the starting phase.
• a similar advantageous speed curve provides that on averaged over time the gradient of the speed curve of the shedding machine between the time t2 and a time t 'has a lower absolute value than in the time average between the times t' and t3.
• the gradient of the speed curve of the shedding machine at the end of the starting phase is the most negative in the entire period of the starting phase.
• the energy recovery is therefore at the end of weaving machine start, at time t3, greatest.
• the speed curve for the starting loom is not ramped, but has a over the entire starting process (between the times t2 and t3) or at least towards the end decreasing gradient.
• the power consumption is made uniform, ie the peak power at the end of the weaving machine start is less pronounced, whereby the energetic jump start is facilitated by the shedding machine.
• the speed of the weaving machine in the present case is to be understood as the value which results arithmetically from its kinetic energy and the average energy moment of inertia (which is defined below).
• the said overspeed of the shedding machine is preferably calculated by means of a calculating unit using machine data.
• the speed curve of the shed forming machine for the entire start phase of the weaving machine is calculated by means of a computing unit using machine data, wherein the speed curve of the shedding machine is preferably oriented to the mathematically expected power requirement of the starting loom.
• Said machine data are preferably those which are used in part or all of the following group: the moments of inertia of the shedding machine and / or the weaving machine, the energetic mean moments of inertia of the shedding machine and / or the weaving machine, grid and feed-related data such.
• process data are used to increase the accuracy preferred in the calculation of the overspeed and the further speed curve of the shedding machine.
• process data are preferably based on calculated or estimated loom losses and advantageously also on shed machine losses.
• process data also include those which are based on the duration of said start phase of the weaving machine.
• the overspeed of the shedding machine is calculated.
• machine data are preferably at least at least the energetically average moments of inertia of Web and fra- image machine used.
• the energetically average mass moment of inertia is the mass moment of inertia of an imaginary flywheel which, rotating at the same operating speed as the working machine (web or shed forming machine), has the same kinetic energy as the machine in question.
• Such a large dimensioning of the shingraft drive is however From a cost point of view, not desirable, so that the above approach, the energy needs for weaving machine start completely out of the It is not practicable to purchase a shed-forming machine.
• the calculation example shows that the energetically average moments of inertia are useful quantities for determining the speed profile or the trajectory of the shedding machine during weaving machine start.
• a further important factor is the network and feed conditions already mentioned above.
• the characteristics of the feed for the common converter intermediate circuit of the weaving and shedding machine are preferably taken into account.
• z. B. twice the rated power taken into account. It is also important if a Vortrafo, z. B. due to special networks, z. B. IT networks, in the weaving, is used.
• the power and the short-circuit voltage or the internal impedance of the pre-transformer play an important role.
• the expected losses of the weaving machine during the start process are relevant. These can be z. B. estimate from the temperatures of the gear oil or - if the weaving machine has already been run in advance - from their average power consumption taking into account life or turn the oil temperature and possibly a new operating speed.
• the losses of the shedding machine incl. ausmoresch (shafts, boards) are preferably included.
• the energetic mean moment of inertia of the shedding machine whose overspeed determined at the beginning of weaving machine start, so that when re-braking to the working speed, the necessary energy or power can be provided. If this were to take place with the assumption of a uniformly ramp-shaped re-deceleration of the shedding machine over time, this would give the lowest possible value that the overspeed of the shedding machine would have for energy recovery.
• Step 2 Due to the gradient of the shedding machine speed that is more negative during weaving machine start in a later section of the starting phase, little or no energy is initially fed into the converter intermediate. fed back, with increasing time and thus increasing power and energy requirements of the weaving machine correspondingly more.
• FIG. 1 shows a flowchart for illustrating a calculation method of the feedback for the case of a constant energy transmission component
• FIG. 2 shows a schematic speed-time diagram with t1 ⁇ t2 to illustrate the invention
• Figure 3 is a schematic speed-time diagram with t1 ⁇ t2 similar to Figure 2, but with a local maximum of the speed of the shedding machine, and
• Figure 4 is a schematic speed-time diagram with t1> t2.
• FIG. 1 shows a calculation method which assumes that the power requirement of the weaving machine is supported pro rata at every time the weaving machine is started, the proportion remaining relatively constant (eg 40%).
• the weaving machine start should run in such a way that the see energy and the average energy moment of inertia calculated speed ramped over time to the working speed increases.
• the expected power requirement of the weaving machine is thus covered with a percentage that remains constant, which is possible if the time t2, ie the starting time of the weaving machine, does not lie before the time t1 at which the shedding machine has reached its predetermined overspeed.
• the first maximum power requirement of the weaving machine is determined from the machine and process data 1A '.
• machine data in this example the working speed and the energetic mean moment of inertia of the loom are used.
• This maximum demand power is now in turn compared with those machine data that characterize the grid or feed conditions; This includes the characteristics of any pre-transformer (rated power, short-circuit voltage or internal impedance) as well as the characteristics of the supply unit for the converter DC link (passive or active mains supply, possibly boost converter function, peak power).
• the juxtaposition is an estimate. For example, in tables determines at which peak power the respective Vortrafo or the feed unit concerned can expect what voltage drop. If the total expected voltage drop in the inverter DC link is so strong that either the voltage requirement at the motor terminals can no longer be covered and / or the undervoltage monitoring of the converter DC link is triggered and a startup interruption is caused, additional energy or power must be provided by the Tray machine be fed.
• This power component to be added by the shedding machine is output as the value 1 a '(demand) from the calculating step 1A.
• a calculation step 1B is carried out, in which the known peak torque of the shingraft drive is multiplied by its working speed. This gives the peak performance of the shingraft drive. Possibly. previously a loss torque is deducted from the peak torque.
• the thus calculated peak power of the shingder drive is output as the value 1 b '(possibility) from the calculating step 1B.
• step 2 first 1 a '(demand) and 1 b' (possibility) are compared. If the demand is greater than the possibility, problems of the aforementioned type can not be ruled out at the start of the intended working speed. Therefore, a reaction is triggered in step 2B. This may consist in a warning message to the operator, possibly connected with the request to select a lower operating speed and to start the machine as a test, s. Path 2b '. Thus, the estimates from step 1 A can be corrected by an actually observed behavior of the converter DC link. Another possibility is to automatically reduce the working speed with a corresponding message to the operator. Here again, the relevant machine start can be used for verification and, if necessary, correction of the assumptions from step 1A. The reduced working speed should be calculated so that for them the demand 1 a 'is just as high as the possibility 1 b'.
• FIG. 2 shows three exemplary profiles of the rotational speeds of the shed forming machine (FBM) and of the weaving machine (WM) as a function of time in accordance with the invention.
• the shedding machine is started and driven to the predetermined, in particular calculated overspeed GXJ.FBM until time t1 (see above).
• the weaving machine is started and ramped up to a working speed co ar in a starting phase which extends from the time t2 to a time t3.
• energy is fed back from the shedding machine to the weaving machine in a defined manner, whereby a possible calculation method has been presented above.
• the gradient of the speed curve of the shedding machine in a later section of the starting phase of the weaving machine (which lies between the times t2 and t3) is more negative than in an earlier section.
• the later section does not necessarily border on the time t3 and / or the earlier section on the time t2 (or t1 if t1 is later than t2, see FIG. rather, gradient curves within the period between times t2 (or t1, when t1 is later than t2) and t3 can be compared with each other.
• the gradient of the speed curve of the shedding machine (referred to here as FBM ') shown at the end of the starting phase is even the most negative in relation to the entire period of the starting phase, ie the curve in FIG Time t3 has the largest negative slope in the range between t2 and t3.
• the gradient of the speed Run the shedding machine between the time t2 and an example in FIG 2 marked time t 'less negative than the time average between the times t' and t3.
• the speed curve of the weaving machine (indicated here as WM ') shown in a solid line is shown in FIG. 2 as rising in a linear ramp, as assumed in the above calculation method. Dashed lines show an alternative speed curve for the weaving machine (here referred to as "WM"), in which the speed during start-up has a decreasing positive gradient between times t2 and t3. With such a curve, the power consumption is more uniform than with a linear start-up. since the power peak is less pronounced at the end of the loom start An exemplary corresponding speed curve of the shedding machine (referred to herein as FBM ”) is also shown in phantom.
• FBM exemplary corresponding speed curve of the shedding machine
• the flatter course WM "of the weaving machine corresponds to that since the energy recovery at the end of the starting phase of the weaving machine is lower than for the previously discussed case of ramping up the speed WM 'of the weaving machine.
• FIG. 2 shows a third variant in Figure 2 with dash-dotted lines.
• the speed curve of the weaving machine (referred to here as WM '") has an S-shape, which is also found in the speed curve of the shedding machine (referred to here as FBM'").
• FBM' speed curve of the shedding machine
• the energy recovery from the shedding machine to the loom is - after each flatter Speed curves following the time t2 - during the strongest increase in the speed of the loom particularly large.
• FBM '"and WM' again from.
• FIG. 3 shows the above-described case of a local maximum of the speed of the shedding machine. It must be checked in each case whether this is above the permissible maximum speed of the shedding machine.
• FIG. 4 shows the case that the time t1 is later than the time t2. Since - as described above - the weaving machine at the beginning of the start phase does not benefit from support from the shedding machine, the weaving machine can already be started (at time t2), before the shedding machine reaches its calculated overspeed at time t1. Importantly, it is then ready to transfer energy to the weaving machine in the time interval from t1 to t3.
• the control of the main drive of the loom and the electronic power take-off of the shedding machine is taken over by a controller, which is prior art and therefore not described in detail here.
• the above calculations are performed with a computing unit connected to said controller.

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• 2015
  • 2015-02-12 DE DE102015102029.7A patent/DE102015102029A1/de not_active Withdrawn
• 2016
  • 2016-02-11 RU RU2017131641A patent/RU2664381C1/ru not_active IP Right Cessation
  • 2016-02-11 CN CN201680010006.4A patent/CN107208330B/zh active Active
  • 2016-02-11 JP JP2017542027A patent/JP6510059B2/ja active Active
  • 2016-02-11 US US15/546,812 patent/US20180023226A1/en not_active Abandoned
  • 2016-02-11 WO PCT/EP2016/052923 patent/WO2016128517A1/de not_active Ceased
  • 2016-02-11 EP EP16703979.1A patent/EP3256628B1/de active Active

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