JP4830808B2 - Compressed air abnormality detection method for air jet loom - Google Patents

Description

  The present invention relates to an abnormality detection method for compressed air for weft insertion in an air jet loom.

In the prior art disclosed in Patent Document 1, the compressed air 4 from the air pressure source 2 passes through an air tank 6, a filter 7, and a dryer 8 and is sent to each air jet loom 3. A pressure detector 9 for detecting a pressure drop is provided in a pipe line between the air jet loom 3 and the dryer 8 on the upstream side. The pressure detector 9 is connected to a stop control circuit 10, and this stop control circuit 10 is connected to the stop devices 11 of all the air jet looms 3.
If there is an abnormality on the upstream side of the pressure detector 9 and the detected pressure in the pressure detector 9 is below the pressure value (set value) necessary for normal weft insertion, the pressure detector 9 will reduce this pressure. And a detection signal is transmitted to the stop control circuit 10. Then, the stop control circuit 10 sends a stop signal to all the stop devices 11 of the air jet looms 3 and immediately stops them.
Japanese Utility Model Publication No. 63-24145 (pages 1 and 2, FIG. 1)

  However, the conventional technique disclosed in Patent Document 1 can detect an abnormality in which moisture is mixed into the compressed air 4 due to a failure of the dryer 8 or foreign matter such as dust is mixed into the compressed air 4 due to a failure of the filter 7. There is a problem that the reliability of the loom is impaired. The above abnormality can be detected if a special detector for detecting moisture in the compressed air is provided in the piping path, but there are problems that the number of parts increases and a special installation space is required.

  The present invention has been made in view of the above problems, and an object of the present invention is to detect abnormalities such as moisture mixing in compressed air supplied from a compressed air source without requiring the installation of a special detector. An object of the present invention is to provide a compressed air abnormality detection method for an air jet loom.

In order to achieve the above object, the invention according to claim 1 is provided with a pipe for connecting a compressed air supply source and an air jet loom, and detects the weft arrival timing of flying weft flying by the injection of the compressed air. In the air jet loom provided with the apparatus, the air jet loom is divided into piping groups for each compressed air supply source, and the arrival timing detected by the weft detection device provided for each loom in the piping group. An abnormality of the compressed air supplied from the compressed air supply source to the pipe group is detected based on an abnormality occurrence rate.
According to the first aspect of the present invention, the abnormality (for example, pressure) of the compressed air supplied from the compressed air supply source to the pipe group is determined based on the abnormal ratio of the arrival timing detected by the weft detection device in the same pipe group. Therefore, the existing weft detection device can be used as it is, and there is no need to newly install a special detector. Therefore, the number of parts and the installation space can be reduced, and the apparatus can be simplified. The weft arrival timing in the present invention is not limited to the arrival timing at the end position of the weft guide passage, but also includes the arrival timing at an arbitrary position in the weft guide passage.

According to a second aspect of the present invention, in the compressed air abnormality detection method for an air jet loom according to the first aspect, the weft detection device is a weft feeler provided at the end of the weft guide passage.
According to the second aspect of the present invention, since the weft detection device is a weft feeler provided at the end of the weft guide passage, it is possible to reliably detect the arrival timing of the weft to the end of the weft guide passage.

According to a third aspect of the present invention, in the compressed air abnormality detection method for an air jet loom according to the first aspect, the weft detection device is a unwinding sensor provided in the weft length measuring and storage device.
According to the third aspect of the present invention, since the weft detection device is an unwinding sensor provided in the weft length measuring storage device, the unwinding timing detected by the unwinding sensor is detected by the weft feeler provided at the end of the weft guide passage. It can be used as an alternative to the arrival timing of the weft guide passage.

According to a fourth aspect of the present invention, in the compressed air abnormality detection method for an air jet loom according to any one of the first to third aspects, the arrival timing detected by the weft detection device is a single machine stand. Each time it is stored as time-series data.
According to the invention described in claim 4, since the weft arrival timing is stored as time-series data for each single machine, the time-series change for each machine is calculated based on the stored time-series data. Thus, it is possible to easily identify the machine base in which an abnormality has occurred in the arrival timing.

According to a fifth aspect of the present invention, in the compressed air abnormality detection method for an air jet loom according to any one of the first to fourth aspects, a warning is given to the air jet loom of the piping group detected as abnormal or the air is detected. The jet loom is automatically stopped.
According to the fifth aspect of the invention, a warning or automatic stop is performed on the air jet loom that has been detected as abnormal, so that the operator can quickly confirm and take action for countermeasures.

  According to the present invention, compressed air anomaly detection can be performed without additionally installing a detector, so that the number of parts and installation space can be reduced, and the apparatus can be simplified.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, a central management host computer (abbreviated as a host PC) 1 is connected to a plurality of looms 3 via a network 2. Each loom 3 includes a control device 4 and a machine base 5 controlled thereby. In the case of this embodiment, a total of 24 looms 3 are connected to the host PC 1, and various signals are exchanged via the control device 4 of each loom 3. The host PC 1 is composed of a CPU, a RAM, a ROM, etc., and has various control functions, arithmetic functions, and storage functions. And receive overall control.

FIG. 2 shows a piping diagram. Twenty-four looms 3 are divided into two piping groups, and one loom 3 belongs to one first piping group 11, and each loom 3 has a common compressed air supply. A loop-like pipe 14 is connected through a source 12 and a dryer 13. The compressed air from the compressed air supply source 12 is removed from the moisture contained in the dryer 13 and is sent to each loom 3 through the pipe 14.
Further, twelve looms 3 belong to the other second piping group 15, and each loom 3 is connected by a loop-like pipe 18 via a common compressed air supply source 16 and a dryer 17. Moisture contained in the dryer 17 is removed from the compressed air supplied from the compressed air supply source 16, and sent to each loom 3 through the pipe 18.

FIG. 3 is a block diagram showing a schematic configuration of the loom 3. The weft Y supplied from a yarn supplying unit (not shown) is supplied to the weft inserting nozzle through the weft length measuring storage device 21. The weft insertion nozzle includes a tandem nozzle 22 and a main nozzle 23 arranged in series with the tandem nozzle 22, and the weft Y is inserted into the weft Y along the guide passage (not shown) together with the jet fluid by the two nozzles 22, 23.
In the middle of the guide passage, sub-nozzles 24 and 25 formed by a plurality of (in this case, three) nozzle groups are respectively arranged, and the weft Y inserted by the tandem nozzle 22 and the main nozzle 23 is inserted. Subsidize flying. At the end of the guide passage, a weft feeler 26 is provided as a weft detection device for optically detecting the arrival timing of the weft Y. On the other hand, an unwinding sensor 27 is provided at the end of the weft length measuring and storing device 21 to optically detect the unwinding timing of the weft Y that is unwound by the weft length measuring and storing device 21.

The tandem nozzle 22 is connected to the main tank 30 via a tandem valve 28, and the main nozzle 23 is connected to the main tank 30 via a main valve 29. The main tank 30 is connected to a pipe 14 or 18 connected to the compressed air supply source 12 or 16 via a manual regulator 31.
Compressed air sent from the compressed air supply source 12 or 16 is adjusted to a constant pressure in the main tank 30 and temporarily stored, and is supplied to the tandem nozzle 22 via the tandem valve 28. Via the main nozzle 23. Then, the weft Y is inserted into the guide passage by the injection of compressed air from the tandem nozzle 22 and the main nozzle 23.

The sub nozzles 24 and 25 are connected to a sub tank 34 via sub valves 32 and 33, and the sub tank 34 is connected to a pipe 14 or 18 connected to a common compressed air supply source 12 or 16 via a manual regulator 35. ing.
The compressed air sent from the compressed air supply source 12 or 16 is adjusted to a constant pressure in the sub tank 34 and temporarily stored, supplied to the sub nozzles 24 and 25 via the sub valves 32 and 33, and relay-injected. Assists the weft Y to fly in the weft insertion direction.

By the way, the transfer speed of the weft Y to be inserted is affected by the pressure of compressed air supplied from the compressed air supply source 12 or 16, the amount of moisture mixed therein, and the like.
For example, when the compressed air pressure increases due to a failure of a pressure regulator (not shown), the transfer speed of the weft Y increases and the arrival timing of the weft feeler 26 increases. On the other hand, when the compressed air pressure is lowered, the transfer speed of the weft Y is slowed, and the arrival timing to the weft feeler 26 is slowed.
Further, when the amount of moisture mixed in the compressed air increases due to the failure of the dryer 13 or 17 or the like, the transfer speed of the weft Y becomes faster and the arrival timing to the weft feeler 26 becomes earlier at the same pressure.
Furthermore, when foreign matter is mixed into the compressed air due to a filter failure (not shown) or the like (for example, dust is mixed), the weft Y transfer speed is increased and the arrival timing of the weft feeler 26 is accelerated.
By monitoring this variation in the arrival timing, it is possible to detect an abnormality in the compressed air due to a pressure abnormality or moisture mixing.

Control of the machine base 5 of the loom 3 having the above configuration is performed by the control device 4. The control device 4 includes a CPU, a RAM, a ROM, and the like, and has various control functions, arithmetic functions, and storage functions.
As shown by a broken line in FIG. 3, the weft feeler 26 and the control device 4 are connected. When the weft feeler 26 detects the arrival of the weft Y, the detection signal is transmitted to the control device 4. The control device 4 is connected to the function panel 36, and the unwinding sensor 27 and the control device 4 are connected.

Next, the compressed air abnormality detection method of the air jet loom will be described with reference to a specific example based on the flowchart of FIG.
First, in S101, when the arrival of the weft Y is detected by the weft feeler 26 in each loom 3, the detection signal is transmitted to the control device 4 of each loom 3, and the control device 4 detects, for example, each loom 3 It is converted into the rotation angle of the main shaft and stored as the arrival timing TW at the end of the weft guide passage. Note that the smaller the value of the arrival timing TW, the earlier the arrival time of the weft Y to the weft feeler 26, and the greater the value, the later the arrival time of the weft Y to the weft feeler 26.

Next, in S102, the host PC 1 periodically collects actually measured TW data related to the arrival timing TW stored from the control device 4 of each loom 3 connected to the host PC 1 through the network. The collected TW data is stored in the storage unit of the host PC 1 as time series data for each loom 3.
Next, in S103, the host PC 1 determines the difference between the collected latest TW data TW0 and the TW data TW10 of a predetermined time before (for example, 10 minutes before) stored as time series data of each loom 3, that is, TW10−TW0 = Δθ is calculated.
Incidentally, if TW10 = 240 ° and TW0 = 220 °, Δθ = 20 °. In this case, the latest TW data TW0 is smaller by Δθ = 20 ° than the TW data TW10 10 minutes ago, and the arrival timing TW is earlier.

Next, in S104, a comparison process of the magnitude relationship between this difference Δθ and a preset threshold value θs is performed.
Here, in the case of Δθ ≦ θs, the arrival timing TW is considered to vary within an assumed error range, and is determined to be normal. When Δθ> θs, it is considered that the arrival timing TW fluctuates beyond an assumed error range (the arrival timing TW is earlier), and the loom 3 is determined to be abnormal. The
Here, if θs = 10 °, when Δθ = 20 °, Δθ> θs, and it is determined that the loom 3 is abnormal.
Then, the host PC 1 calculates the ratio of the looms 3 determined to be abnormal for each of the piping groups 11 and 15, for example, the number of abnormalities in the first piping group 11 is m, and the second piping group 15 If the number of abnormal in the number is n, the ratio of abnormal number in the first piping group 11 is (m / 12) × 100 (%), and the ratio of abnormal number in the second piping group 15 is ( n / 12) × 100 (%).

Next, in S105, the host PC 1 executes a determination process as to whether or not the ratio of the abnormal number in each of the piping groups 11 and 15 is equal to or greater than a predetermined value.
Here, assuming that the predetermined value is 60%, if the ratio of the abnormal number is 60% or less, the process returns to S102, and the host PC 1 continues to collect the regular arrival timing TW, and the ratio of the abnormal number Is 60% or more, the process proceeds to S106, and it is determined that an abnormality of the compressed air has occurred in the specific piping group (for example, a pressure increase or moisture mixing).

  For example, when (m / 12) × 100 <60 and (n / 12) × 100 <60, it is determined that no abnormality has occurred in both the first and second piping groups 11 and 15, and (m / 12) × 100 <60 and (n / 12) × 100 ≧ 60, it is determined that the first piping group 11 is normal and the second piping group 15 is abnormal, (m / 12) × 100 ≧ 60, and when (n / 12) × 100 <60, an abnormality occurs in the first piping group 11 and the second piping group 15 is determined to be normal, and (m / 12) When x100 ≧ 60 and (n / 12) × 100 ≧ 60, it is determined that an abnormality has occurred in both the first and second piping groups 11 and 15.

In S107, the piping group determined to be abnormal, the number of abnormalities, and the abnormality rate are displayed on the monitor of the host PC1.
FIG. 5 shows an example of an abnormal display on the monitor 101 of the host PC 1. In this case, a display example of the first piping group 11 in which an abnormality occurs in 8 of 12 (m = 8) and the ratio of the abnormal number in the piping group is 60% or more is shown. The entire framework of the first piping group 11 is highlighted (displayed with diagonal lines), and a prohibition mark is displayed for the loom 3 in which an abnormality has occurred.

In S108, the host PC 1 transmits a warning signal to the control device 4 of each loom 3 in the piping group detected as abnormal, and displays a warning on the function panel 36 of each loom 3.
FIG. 6 shows an example of a warning signal displayed on the function panel 36.
The series of controls for detecting abnormalities in the compressed air is automatically performed based on a control program input in advance to the host PC 1.

The compressed air abnormality detection method for an air jet loom according to this embodiment has the following effects.
(1) When the abnormal number of arrival timings TW detected by the weft feeler 26 of each loom 3 in the first piping group 11 or the second piping group 15 exceeds a predetermined value (60%), compressed air Since abnormalities such as moisture mixing in the compressed air supplied to the group from the supply source 12 or 16 are detected, the existing weft feeler 26 can be used as it is, and there is no need to newly install a special detector. . Therefore, the number of parts and the installation space can be reduced, and the apparatus can be simplified.
(2) Since the abnormality information of the individual arrival timing TW of each loom 3 is comprehensively processed as the abnormal number information of the arrival timing TW in the same piping group, the abnormality of the compressed air supplied to each piping group is determined. Therefore, it is possible to make an accurate determination, and an action based on the determination can be taken early. In this case, abnormalities in compressed air may include pressure rise, moisture, foreign matter, etc., and early detection of machine failure and deterioration of the finished quality of the woven fabric can be prevented and reliability of the loom can be improved. Improvements can be made.
(3) Since the arrival timing TW of the weft Y is stored in the host PC 1 as time-series data for each single machine, a time-series change for each machine, for example, 10 minutes, based on the stored time-series data By calculating the difference between the previous TW data TW10 and the latest TW data TW0, that is, TW10−TW0 = Δθ, it is possible to easily identify the machine base in which the arrival timing TW is abnormal.
(4) When an abnormality is detected, since the piping group and the number of abnormalities are displayed on the monitor 101 of the host PC 1, the administrator can promptly and accurately give instructions to the workers on site. it can.
(5) Since a warning signal can be transmitted to the loom 3 detected as abnormal and a warning can be displayed on the function panel 36 of each loom 3, the operator can quickly confirm and take action for countermeasures. I can take it immediately.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.
In this embodiment, the type of the weft detection device in the first embodiment is changed.
Therefore, here, for convenience of explanation, a part of the reference numerals used in the previous explanation is used in common, the explanation of the common configuration is omitted, and only the changed part is explained.

As shown in FIG. 3, in this embodiment, an unwinding sensor 27 is used in place of the weft feeler 26 in the first embodiment as a weft detection device. The unwinding sensor 27 optically detects the unwinding timing of the weft Y that is unwound by the weft length measuring and storing device 21.
Here, assuming that the length of the weft Y required for one weft insertion corresponds to 3 turns on the drum on the weft length measuring and storage device 21, the unwinding sensor 27 has the 1st, 2nd, The third and third unwinding timings are detected. After the third roll is detected, the weft Y that has been inserted reaches the weft feeler 26, and the arrival timing of the weft Y to the end of the guide path is detected.

It is assumed that the unwinding timing detected by the unwinding sensor 27 is KW, and is expressed by the rotation angle of the main shaft in the same manner as the arrival timing TW at the end of the weft guide passage. Further, if the unwinding timing of the first volume is KW1, the unwinding timing of the second volume is KW2, and the unwinding timing of the third volume is KW3, there is a relationship of KW1 <KW2 <KW3 <TW. That is, the unwinding timing KW1 is the smallest (the timing is the earliest), and then the values are increased in the order of KW2 and KW3 (the timing is late).
This is equivalent to providing three sensors on the traveling locus of the weft Y to be inserted and the arrival timing of the weft Y detected by each sensor being KW1, KW2, KW3.
The unwinding timing KW3 of the third volume is the closest to the arrival timing TW at the end of the weft guide passage. In this embodiment, the unwinding timing KW3 is upstream of the end of the weft Y on the flying locus. This is regarded as the arrival timing of the weft Y to a predetermined position on the side.

  By the way, periodic collection timing KW3 is collected by the host PC 1 and stored in the host PC 1 as time series data for each single machine. Based on the stored unwinding timing KW3 data, each calculation comparison process is performed and abnormality detection is performed. This control process is the same as that in the first embodiment, and the process proceeds to the end of the weft guide path. Therefore, the following description is omitted because the arrival timing TW may be replaced with the unpacking timing KW3.

The compressed air abnormality detection method for an air jet loom according to this embodiment has the following effects.
Note that the effects (1) to (5) of the first embodiment are the same when the arrival timing TW at the end of the weft guide passage is replaced with the unwinding timing KW3, and are omitted, and the other effects are described. .
(1) Since abnormality detection of compressed air is performed using the existing unwinding sensor 27 in the loom, it is not necessary to additionally install a special sensor, and the apparatus can be simplified.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.
In the first and second embodiments, it has been described that a warning signal is transmitted to an air jet loom of a piping group detected as abnormal and a warning is displayed on the function panel. However, the machine may be automatically stopped. Further, a warning lamp provided separately may be turned on. Alternatively, two or more of these (for example, panel display and warning lamp lighting) may be combined.
○ In the second embodiment, it has been described that the unwinding timing KW3 of the third roll is used instead of the arrival timing TW at the end of the weft guide passage. However, the unwinding timing KW2 of the second roll or the first roll The unwinding timing KW1 may be used. Even if the length of the weft Y required for one weft insertion is other than 3 on the drum, the unwinding timing KW of each winding is set to the arrival timing TW at the end of the weft guide passage in the same manner as described above. Can be used instead.
In the first and second embodiments, the abnormality in the arrival timing TW or unwinding timing KW3 at the end of the weft guide passage is described as being determined by calculating the amount of change between the data 10 minutes before and the latest data. However, it may be 5 minutes before or 20 minutes ago. Moreover, you may take the average value by multiple times measurement.
In the first and second embodiments, when the number of abnormal arrival timings TW or unwinding timings KW3 at the end of the weft guide passage in the same piping group is a predetermined value (60%) or more, compressed air Although described as detecting an abnormality, it may be other than 60% and can be arbitrarily set.

It is a network connection diagram of the entire system of the air jet loom according to the first embodiment. 1 is a piping diagram of an entire system of an air jet loom according to a first embodiment. 1 is a block diagram illustrating a schematic configuration of an air jet loom according to a first embodiment. It is a flowchart for demonstrating the compressed air abnormality detection method of the air jet loom which concerns on 1st Embodiment. It is a schematic diagram which shows the example of a display to host PC at the time of the compressed air abnormality detection of the air jet loom concerning 1st Embodiment. It is a schematic diagram which shows the example of a warning display to the function panel of a loom at the time of the compressed air abnormality detection of the air jet loom which concerns on 1st Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Host computer 3 Air jet loom 11 1st piping group 12 Compressed air supply source 14 Piping 15 2nd piping group 16 Compressed air supply source 18 Piping 26 Weft feeler 27 as weft detection device Unwinding sensor Y as weft detection device Weft TW Arrival timing at the end of the weft guide passage KW3 Unwinding timing as arrival timing

Claims (5)

In an air jet loom equipped with a pipe for connecting a compressed air supply source and an air jet loom, and provided with a weft detection device for detecting the arrival timing of a weft flying by injection of the compressed air,
Air jet looms are divided into piping groups for each compressed air supply source,
By the abnormality occurrence rate of the arrival timing detected by the weft detection device provided for each loom in the piping group,
An abnormality detection method for compressed air in an air jet loom, comprising detecting an abnormality in the compressed air supplied from the compressed air supply source to the pipe group. The method for detecting an abnormal compressed air in an air jet loom according to claim 1, wherein the weft detection device is a weft feeler provided at the end of a weft guide passage. 2. The compressed air abnormality detection method for an air jet loom according to claim 1, wherein the weft detection device is an unwinding sensor provided in a weft length measuring storage device. The air jet loom compression according to any one of claims 1 to 3, wherein the arrival timing detected by the weft detection device is stored as time-series data for each single machine stand. Air abnormality detection method. The compressed air of the air jet loom according to any one of claims 1 to 4, wherein an air jet loom of the piping group detected as abnormal is warned or the air jet loom is automatically stopped. Anomaly detection method.

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