JPH08269825A - Spinning machine and method of monitoring spinning machine section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring method capable of rapidly and simply stopping a trouble by installing a central control apparatus for receiving the state signal of a spinning part and sending an alarm to a selector when an obtained product value is out of a limit and clarifying the cause of the trouble. SOLUTION: This spinning machine or spinning machine part is equipped with a central control apparatus PLR which receives a signal showing the state of a spinning machine RSM, monitors the efficiency or qualities of a product in the spinning machine in each selector based on the signal and sends a signal when a value obtained for the selector is out of a fixed limit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a process control device capable of assisting operation after a failure has occurred or has started to occur in a spinning operation.

[0002]

BACKGROUND OF THE INVENTION Devices for monitoring the operating conditions of textile machines are known. For example, European Patent No. 5083, European Patent No. 2 as the patent specifications concerned.
6110, European Patent No. 26111, and W
There are respective publications of O92 / 13121.

An operation support device based on this type of monitoring is
For example WO 91/16481, European Patent 512442, Federal Republic of Germany 413124.
No. 7 and German Patent No. 4334472.

In order to avoid repetition of long explanations, the above W
O91 / 16481, WO92 / 13121, European Patent 512242, German Federal Patent 4131247, European Patent 541483 and German Federal Patent 43.
The contents of the 34472 publication are cited in the present application.

The Swiss patent application (“preceding” application, title of the invention “monitoring action for supporting movements in spinning machines” Swiss Patent No. 00102 / 93-3) describes “continuation of the textile machine area (textile machine group)”. The purpose is to take measures to detect the danger of failure and to assist the operation.The entire contents of the prior application are included in this application, and the description below is made. It is assumed to be publicly known in.

[0006] This application is directed to measures to be taken when obstacles occur in at least a part of the spinning machine or when the approach is unavoidable.

[0007]

COMPARISON OF THE PRESENT INVENTION AND PRIOR APPLICATIONS The prior application is primarily directed to the interaction between the various effects of disorders that can lead to overloading of operating capacity. According to this recognition, a fault outage (down) begins when the demand for manipulative capacity becomes excessive. In this case, the failure dysfunction itself develops hours and even days or even days after the start of injury entry. This application is therefore directed to the operating load itself, which actually (essentially) represents the direct cause of the failure.

On the contrary, the present invention is directed to the cause of operator overload. At the same time, the invention must recognize that the causes of disability are extremely diverse. Therefore, the recognition of this "incentive" using a sensor device provided for the purpose of detecting the cause must be regarded as unrealistic in the foreseeable future. The underlying cause is currently only determined by "symptom analysis" and the conclusions derived from it.

The "major symptom" of a disorder is a more or less rapid decline in production efficiency or quality.

Efficiency Efficiency is defined by the following equation: η = spindle operating time / total spindle time = (t1 + t2 + ... t
n) / nT = Σ ₁ ⁿ tx / nT, where η is the efficiency, t1 ... tn is the production time of each individual spindle 1-n, n is the number of spindles, T is the predetermined period-this The average value of efficiency is evaluated within the period.

What is needed to detect a trend is to calculate the instantaneous value of efficiency (ηm) regularly within a period T (eg after the scanning interrogation interval ΔT). The instantaneous value ηm is compared with the average value η during the whole period T. The latter period T lasts, for example, several hours (8 hours or even 24 hours). On the other hand, the interrogation cycle for the calculation of the instantaneous value ηm has a significantly short interval (for example 5 minutes).

Quality There are various characteristics of yarn that can be or are evaluated as the basis for quality judgment.

For example: a) “On-line” measurement is possible: Number of cleaning cuts Classimat error Thread thickness Foreign matter / fiber number Number of thread breaks (indirect index) b) Off-line measurement is possible : IPI value with uneven strength of yarn (European Patent No. EP-A-410429 or "Quality in a spinning machine", Peter Hae
ltenschwiller and Hugo Evevl
e, Melliard Textilbericht
e)).

The final user (operator) himself determines which characteristic value to use as a quality measure. Therefore, this user must provide a suitable sensor to transfer the signal to the process control calculator. Choosing the right scale is
To be precise, it depends on the intended use of the yarn as well as on the choice of the measured value, which is defined as the limit between "acceptable" and "not acceptable" quality.

For the purpose of determining the quality of the spinning station with respect to quality, a binary function (working function "working" / "working") is defined in the form "acceptable" / "not acceptable".

The causes of the decrease in efficiency or quality are, for example, as follows: Change in count Change in twist Increase in rotational speed Break in yarn during start Breakage of yarn splicing robot End of traveler's life Material change (or wrong material) Air-conditioning changes These causes appear from the start to the entire group of spinning machines (significantly rarely) (the exception being "significant" changes in air-conditioning). Often only one spinning machine is affected in the first place, but only one section of a spinning machine (eg one spinning machine side row) is affected. This effect can be spread to the entire spinning machine group due in part to interactions as described in the prior application. Furthermore, for example, when the operating capacity is insufficiently secured, the operator is overloaded in order to limit and pursue the original influence.

[0017]

The problem to be solved by the present invention is to further clarify the source of the obstacle and prevent the risk of the obstacle from expanding.
This makes it possible to stop the failure as quickly and easily as possible.

[0018]

To this end, the monitoring device for the spinning machine or the spinning machine section according to the invention is characterized as follows. That is, the production efficiency or quality is monitored for each sector in the spinning machine or the spinning machine section, and when the obtained value of one sector is outside the predetermined limit, an alarm is activated.

An alarm is provided as an operational instruction to deactivate the affected sector.

When the monitoring device is arranged such that remote control of the monitored sector is possible from a central location, the affected sector is affected at a given value of the efficiency or quality of the affected sector. A signal for deactivating the device is transmitted.

The central controller can inspect the supplied data according to a "pattern", ie according to a predetermined combination of spinning conditions.

The basis of the recognition of the present invention is that the cause of the disturbance should be limited as much as possible and corrected as quickly as possible, that is to prevent the spread. Deactivation temporarily secures the affected spinning station.
As a result, the operating state of the working part (area) of the spinning machine, which is still in operation, is stabilized first and then the deactivated spinning machine working part becomes operational again.

Next, an embodiment of the present invention will be described with reference to the drawings.

[0024]

The installation shown in FIG. 1 comprises 16 rotor spinning machines RSM I to XVI, a process control computer PLR and a signal transmission network N. This transmission network is connected for bidirectional communication between each spinning machine RSM and the calculator PLR.

Each spinning machine RSM includes two end heads 102, 104 and, in between, two rows 106L, 106R (FIG. 2) of a plurality of spinning units 108. Although FIG. 2 shows only eight units per side row, in practice one spinning machine of this kind has 100 to 120 units per side row. These spinning units are arranged in sections. Each section has one section calculator SP.
Each unit has two unique sensors (not shown), one status sensor and one quality sensor. A status sensor indicates whether this unit is producing and a quality sensor indicates whether this product has a satisfactory quality standard. Rotor spinning machines differ in this respect from ring spinning machines-which do not have their own sensor of this kind. These sensors are connected to a so-called box print BP. The BP is connected to each section calculator SP via a line.

The signals of the plurality of sensors are transferred into the end head to the spinning machine calculator CZ via the section calculator SP. The spinning machine calculator CZ is connected to the process control calculator PLR via a signal transmission network N. Each spinning machine calculator CZ transfers the sensor signal to the process control calculator PLR. So the latter calculator can list the spinning room status. This is not possible for individual spinning machines. The arrangement of the individual spinning machines shown in FIG. 2 can be constructed according to EP 156153.

For simplification, the following is assumed. That is, each spinning machine RSM has 200 spinning stations (spinning units), and these spinning stations are further divided into 5 sections, each having 40 spinning units. Therefore, the calculator PL
R monitors 3200 spinning units, ie 80 sections. Current calculators can easily individually monitor the efficiency or quality of each and only one section, and even distinguish machine side rows at the same time. However, a slightly simpler variant will now be described.

An important feature of the present invention is that the supplied data is examined according to a predetermined "pattern". These predetermined "patterns" can be "filed" into the memory of the process control calculator. The pattern actually obtained can be compared with the next stored pattern.
As a result, an alarm is activated when the pattern actually obtained corresponds to the predetermined pattern. In this way,
The cause of the disorder can also be detected. The device according to the invention advantageously comprises, for example, a display device capable of displaying the possible cause of the fault.

There can be two types of "patterns". That is, a sample (characteristic) based on time and a sample (characteristic) based on space. Figure 3 shows the spinning machine "sector" S1
Indicates "division into 4" to S4. Therefore, sectors S1 and S
2 and sectors S3 and S4 each constitute one "spinner side row". The first "spatial pattern" can be configured to detect whether only one sector S1 to S4, the side row of the spinning machine or even the entire spinning machine was affected due to the obstacle.

FIG. 4 shows a group of adjacent spinning machines. The second "spatial pattern" is such that it is detected whether only one spinning machine is affected by the fault, or a plurality of adjacent spinning machines or all spinning machines of this group are affected.
It is configured.

On the other hand, FIG. 5 shows a "time pattern". This occurs depending on how fast the obstacle progresses, ie the "step" function (Fig. 5A) or the "slope" function (Fig. 5).
B). These “patterns” are essentially “curves”
Differentiated from each other depending on the slope of.

For example, a "mosaic" can be formed based on the following table.

Cause Time pattern Space Pattern count change Step function Overall spinning machine Twist variation Step function Overall spinning machine Rotation speed variation Step function Overall spinning machine Thread break at start Step function Overall spinning machine automatic splice failure Step function Spinning machine side row ^* Traveler end of life Slope Spinning machine Material change Step function Spinning machine Sector to entire spinning machine Air conditioning change lamp Individual sector, only one spinning machine to entire room ^* (Exception: This spinning machine is one robot per side row) Equipped).

The first three causes are returned to the spinning machine setting adjustment. Changes in spinning machine setting adjustments can also be reported to the process control calculator (or even initialized by the process control system). Therefore, these three causes can be identified in association with the appropriate mosaic of temporal and spatial patterns.

The current ring spinning machine does not have its own quality sensor, but a sensor is provided in the spinning chamber. The purpose is to monitor the quality of the yarn. This is to monitor the quality of the yarn in the bobbin winding machine that rewinds the cup from the spinning station. At present, devices are also known for detecting the spinning stations that have formed this cup-for example German Patent DE 3712654.
See Swiss Patent No. 410718. The data enabling the detection of the faulty spindle can be transferred to the process control calculator and examined according to the "pattern".

The present invention can be used in spinning rooms with varying degrees of automation. This is because the present invention has the goal of assisting the operator, which is also useful in manually operated spinning machines. In the preferred embodiment, a plurality of spinning machines are linked by a network. Otherwise the spinning section “list” will be missing. In principle, it would also be possible to carry out a given analysis on only one spinning machine. However, in this case, the comparison between a plurality of spinning machines is not performed, and a load of the calculation ability of the spinning machine control occurs.

The operation of the affected spinning station can be stopped by remote control under the following predetermined conditions. This can be done, for example, where the plurality of spinning stations are each provided with an individual drive or with a respective fiber supply which can be deactivated. The deactivation can be operated directly by mechanical control or by using a mobile robot (eg WO92 / 157).
No. 37).

FIG. 6 shows a predetermined time relationship diagram. The horizontal axis represents the time axis. The "window" F has a fixed duration T.
The leading edge of this window represents the present (time t0). Therefore, the window F includes the immediately preceding past. The duration T is a predetermined number of "question cycles", that is, "question interval" of duration ΔT.
including. During each interval ΔT, new instantaneous values of efficiency or quality characteristic values are determined. The magnitude of the instantaneous value or the value derived therefrom is stored for a period T and used for subsequent processing (eg by the device shown in FIG. 7). The accuracy of the calculation of the interval ΔT is also the "reality" of the result.
Also limit. This is because the spinning station status is maintained only during the entire interval ΔT.

FIG. 7 shows an apparatus for subsequent processing of the data generated by the spinning machine.

Basically two memories P or Q are provided for each spinning machine. Each memory contains a corresponding number of memory cells for this number of spinning stations. Each cell is assigned to one spinning station and contains data representing the interrogated status of the corresponding spinning station.

The memory P contains production data. as a result,
The data stored in the cells for the spinning station represent the states "in production" (active) or "not in production" (inactive). The memory Q contains quality data for each spinning station. These data represent the states "acceptable" or "not acceptable". Since the cells are assigned to spinning stations, these cells are also assigned to sectors S1 to S4. This is also shown in FIG.

The data were obtained on each spinning machine, for example from the spinning station shown in EP 156153, WO 92/13121,
It is transferred to the process control calculator shown in Obj22121. The loading of data into the memory cells is not described here. However, the data is queried within each interval ΔT (prior to the reading of new state data) and the data representing the inactive or unacceptable state is read out via the bus B1 or B2 and the counter Z1 is read. Or it is supplied to Z2.

The result of the calculation (the number of spinning stations that are inoperative or unacceptable) is read into the memories R1 to RX. Each of the memories R1 to RX is configured as a shift register. The number of cells in each register corresponds to the number of intervals ΔT in one period T. Time t0
During the reading of new data during the cycle starting at, the data obtained during the oldest cycle Za of window F (FIG. 6) is pushed out of the register. Therefore, the data stored in the shift registers R1 to RX is the window F
Represents the data stored during each interval ΔT of, which contains the sum Σ ₁ ⁿ tx. However, Σ ₁ ⁿ tx represents the loss of the interval.

The shift registers R1 to RX also represent the sectors S1 to S4 of the spinning machine, the side rows of the spinning machine and the spinning machine itself and (if desired) the spinning machine group. In the last case, it is necessary to combine the data from multiple memories P or Q.

On the basis of these data it is possible to derive, for example, different possible magnitudes of values for each sector:
Instantaneous value of efficiency Σ ₁ ⁿ tx / nt during each interval of the window (values nT and ΔT for a given number n of spindles are known and need not be calculated each time).

The average value of the efficiency η over this period T.

The slope of any change in efficiency over time within window F.

Corresponding characteristic values for quality.

The analysis unit AE can read the stored data and examine them by the method described above. In this case, a comparison is made between the resulting value and the predetermined pattern or mosaic stored in the memory BS.

As mentioned above, the magnitude of these values is used for each sector S1 to S4, the spinning machine side row and the spinning machine group.

The calculated value is also compared with a predetermined limit value that can be retained in the memory BS in a callable manner.
For example, two limit values have been defined for each calculated value, and exceeding the first tolerance limit means that the calculated value is outside the acceptable range (and in some cases Some reason) is displayed. If the second allowable limit is exceeded, the affected spinning machine group will automatically (when this is possible) or by an instruction to the operator,
The operation is stopped. The limit value can be set by the user according to the request. It can be set, for example, by loading a value previously given by the user into the memory BS.

[Brief description of drawings]

FIG. 1 is shown in WO92 / 13121,
FIG. 5 is a block diagram of a process controller for one rotor spinning machine section having 16 rotor spinning machines.

2 is a detailed view of the individual units of the spinning machine shown in EP 295406, which can be used in the group shown in FIG.

FIG. 3 is various “patterns” to be determined by a calculator.

FIG. 4 is various “patterns” to be determined by a calculator.

FIG. 5 is a second form of various “patterns” to be determined by a calculator.

FIG. 6 is a diagram illustrating a time relationship.

FIG. 7 is a block diagram of an apparatus for obtaining a production value or an efficiency value.

[Explanation of symbols]

 102, 104 end head 108 spinning unit SP section calculator CZ spinning machine calculator N circuit network S1 to S4 sensor BS memory F window

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Claims (8)

[Claims] 1. A spinning machine or a spinning machine section is provided with a central control unit, which receives signals representing the state of the spinning section, and the central control unit performs spinning based on these signals. A spinning machine characterized by being able to monitor the efficiency or quality of the product inside the spinning machine or the spinning machine section for each sector, and issuing an alarm when the value obtained for the sector deviates from a predetermined limit. Or spinning machine department. 2. The spinning machine according to claim 1, wherein the alarm is arranged as an operation instruction for stopping the operation of a sector in which a failure has occurred. 3. In a spinning machine in which the remote control of the monitored section is also possible from a central control unit, at a given value of efficiency or quality, a signal for deactivating the defective sector is provided. The spinning machine according to claim 1, which is transmitted. 4. The central control unit according to claim 1, wherein the central control unit can inspect the supplied data according to a "pattern", ie according to a predetermined combination of several states of the spinning operation. Spinning machine. 5. The spinning machine according to claim 4, wherein a comparison with a standard pattern, which is a typical cause for a given fault, is performed and the possible cause of the fault is displayed. 6. The efficiency is defined by the equation: η
= Spindle production time / total spindle time = (t1
+ T2 + ... tn) / nT = Σ ₁ ⁿ tx / nT, where η is efficiency, t1 ... tn is the production time of each individual spindle 1-n, n is the number of spindles, and T is a predetermined value. Spinning machine according to any one of claims 1 to 5, which is a period-an average of the efficiencies being evaluated within this period. 7. The quality is judged by using at least one of the following characteristic values, namely, the number of cleaning cuts, Classimat error, yarn thickness, the number of foreign fibers, and the number of yarn breaks. The spinning machine according to any one of claims 1 to 6, wherein the determination is made by using one of the intensity unevenness IPI value. 8. A method for monitoring a spinning machine or a spinning machine section, wherein the efficiency or quality of a product is monitored for each sector in the spinning machine or the spinning machine section, and the obtained value of one sector is out of a predetermined limit. And a warning method for activating the spinning machine or spinning machine section.