JPH0440459B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention is useful for detecting abnormalities, improper adjustment, or maintenance defects in the weft inserting mechanism of a water jet loom (hereinafter abbreviated as "WJL"). This relates to the diagnostic equipment used.

《Conventional technology》 WJL is becoming faster every year, and even in actual weaving factories.
The looms are operated at around 800 rpm, and in order to efficiently operate these high-speed looms in groups, a loom management system is being introduced.

《Problems to be solved by the invention》 However, although conventional loom management systems are effective in obtaining statistical data on loom operating rates and textile quality, they are not effective in obtaining statistical data on the operating rate of looms and the quality of textiles. However, it has been impossible to obtain data regarding the condition of each part of the loom, the quality of adjustment and maintenance, etc., which are the prerequisites for the operating rate and quality.

In WJL, the weft is conveyed by jetting water,
At this time, it must be designed and adjusted so that the necessary and sufficient conveying force is applied to the weft at an appropriate timing. However, currently more than 60% of WJL stoppages are due to poor weft flight, such as dead stops and tangled ends. Poor weft flight occurs due to a complex interaction of weft insertion conditions such as water pressure, water volume, and injection timing. Inconsistency in these weft insertion conditions can be caused by abnormalities or adjustments in the weft insertion mechanism such as the pump or nozzle. This is thought to be caused by a defect. In weaving factories, the weft insertion mechanism is adjusted according to the type of yarn, the reed width of the loom, the rotation speed, etc., but the reality is that these adjustments and maintenance of the loom rely on experience and intuition. Currently, setup work takes a long time and it is not possible to objectively judge whether or not adjustments have been made accurately.

Therefore, in the present invention, it is possible to adjust and maintain the loom by objectively determining the operating status of pumps, nozzles, etc., adjustment status of various operation timings, etc., especially for the weft insertion mechanism where the weft stoppage occurs frequently. The objective is to obtain a diagnostic device that can obtain various data necessary for the determination.

<<Means for Solving the Problems>> In order to solve the above problems, the present invention provides sensors 1, 1a, 1b for detecting the water pressure of the nozzle 19 and sensors 2, 2a, 2b for detecting the operation of the clamper 20.
The sensors 1 and 2 are arranged at a predetermined angle of the crankshaft in each pick, for example, every 1 degree of crank angle.
means 5 for reading the detected values, means 6 for storing the detected values across a plurality of picks sufficient for statistical processing, and determining at least the maximum value Pm of the nozzle water pressure and the clamper open start angle from these stored values. The present invention proposes a diagnostic device for a weft insertion mechanism in a water jet loom, which comprises means 7 and 8 for creating and displaying a frequency distribution table for specified inspection items including θc ₀ .

《Operation》 If you install the above diagnostic device and drive WJL,
Changes in nozzle water pressure and clamper movement for multiple picks are detected and recorded in relation to crank angle. From this detection data, the maximum value Pm of the nozzle water pressure, the nozzle water pressure Pco when the clamper starts opening, the momentum of the jetted water, that is, the value A obtained by integrating the nozzle water pressure with the crank angle and dividing it by the rotation speed,
Statistical data can be obtained by picking multiple times on inspection items such as the crank angle θws at the start of water injection, the water injection period θw expressed in crank angle, the clamper open start angle θco, and the clamper open angle θc. The obtained data reflects the condition of the weft insertion mechanism of the WJL, and by analyzing this data, as shown in the example below, it is possible to identify abnormalities or maladjusted areas in the weft insertion mechanism of the loom. can be found.

《Example》 The figures show an example of the present invention. Figure 1 is a diagram corresponding to the claims, Figure 2 is a block diagram of the device,
Figure 3 is a flowchart showing the operation of the device;
The figure is a diagram showing an outline of the weft insertion mechanism.

In FIG. 4, as the pump cam 11 rotates, the plunger 15 is pulled out from the plunger pump 14 via the cam roller 12 and the bell crank 13, water is sucked into the pump 14 from the water tank 16, and the pump spring 17 is compressed. .
The moment the cam 11 reaches its maximum lift, the plunger 15 is opened, and the restoring force of the compressed spring 17 forces out the water in the pump 14. The pushed out water passes through the water conduit 18 and is ejected from the nozzle 19, and the clamper 20 is opened and the stored weft yarn 21 is conveyed by the jet of water. Then, the clamper 20 closes at the timing after the water injection ends, and the cam 11 closes for the next water injection.
starts pulling out the plunger 15. The nozzle water pressure during this one-pick weft insertion operation is detected by a small strain gauge type pressure sensor 1 installed just before the nozzle 19, and the opening/closing operation of the clamper is detected by a proximity switch 2 installed above the clamper 20. It is then detected.

As shown in FIG. 2, two pressure sensors 1 and two proximity switches 2 are provided to enable diagnosis of a two-nozzle loom. pressure sensor 1a,
The signal from 1b is sent to amplifiers 31a, 31b and A/
The signal is input to the CPU 33 via the D converter 32 at every timing commanded by the angle controller 4.
The on/off signals from the proximity switches 2a and 2b are
It is input to the CPU 33 via the interrupt controller 34, and at the same time, the crank angle indicated by the angle controller 4 is read and input to the CPU 33.
When these signals for one pick are input, they are sequentially stored in the data memory 5.

The on/off signal from the timing sensor 3, which operates every revolution of the crankshaft, is input to the CPU 33 via the interrupt controller 34 with priority over other signals, and the contents (crank angle) of the angle controller 4 are cleared by this signal. . When the driving sensor 35 detects the stoppage of the WJL or when the predetermined number of picks is reached, the acquisition of each signal is finished. The timing sensor 3 is
The timing switch for the WJL feeler, the driving sensor 35, the magnetic switch for the WJL main motor, and the angle controller 4.
The timer interrupt function of the CPU 33 can be used.

After completing acquisition of each detection signal, the CPU 33 calculates the data stored in the data memory 6 by operating the keyboard 37 through interaction with the display 36, and sends the results via the CPT controller 38.
It is displayed on the CPT 36 or output to the printer 40 via the input/output interface 39.

In the flowchart of FIG. 3, in the data acquisition condition setting step 51, data acquisition conditions such as the number of picks to be measured and analyzed, the pressure sensors 1a, 1b to be used, and the proximity switches 2a, 2b are specified through dialogue with the operator. Set. What conditions should be set at this time depends on the content of the data acquisition program, taking into account the versatility of the device. If 2 nozzles are specified,
Synchronization with WJL is performed in steps 52 and 53 in order to capture data on the first nozzle. Next, data for one pick is captured in steps 54 to 57, but during this time, when a stop command is given (step 55) or when the machine stops (step 56), output setting step 60 described later is performed. Move to.
Data for one pick is captured every 1 degree of crank angle, and in step 58, the number of picks for which data capture has been completed is counted, and when the set number of picks is reached, the process moves from step 59 to output setting step 60.

In the output setting step 60, inspection items for which a frequency distribution table is to be created are specified through interaction with the operator. Of course, it is also possible to adopt a configuration in which such a designation is not made and a frequency distribution table for all recorded test items is output. Examples of test items for creating frequency distribution tables are described in the section on effects above. Once the inspection item is designated, the data stored in step 61 is retrieved and calculated, and the results are output in the form of a graph and calculated values (step 62). The frequency distribution of these inspection items indicates that there are no defective parts on the loom.
If each part is adjusted accurately, the variation will be within a small range.

Figures 5 to 11 show a 1-nozzle WJL (reed width 145cm, rotation speed 505r.pm)
maximum nozzle water pressure Pm (Fig. 5), nozzle water pressure Pco at the start of clamper opening (Fig. 6), momentum A of jetted water (Fig. 7), water injection start angle θws (Fig. 8).
2), water injection angle θw (FIG. 9), clamper open start angle θco (FIG. 10), and clamper open angle θc (FIG. 11). The frequency in each figure is calculated by classifying the data for 2000 picks into 150 classes and showing the frequency of appearance for each class.

On the other hand, FIG. 12 is an example of a histogram of the maximum nozzle water pressure Pm of a loom in which the pump drive system is worn, and a considerable variation is observed. Figures 13a and 13b are examples of histograms when the clamper mechanism is maladjusted in a two-nozzle two-over WJL.From this histogram, the clamper open start angle θco of the first nozzle side and the second nozzle side can be determined. It is easy to infer that they do not match.
In addition, the example in Fig. 14 shows the first
This figure shows an output example of a histogram of the maximum nozzle water pressure Pm in a two-nozzle loom in which nozzle bodies with different structures are mistakenly attached to the nozzle and the second nozzle.

<<Effects of the Invention>> As described above, by measuring the nozzle water pressure and clamper operation at multiple picks using the diagnostic device of the present invention and examining the frequency distribution, it is possible to improve the weft insertion mechanism of WJL. WJL can be improved by predicting the presence of abnormalities and poorly adjusted locations and taking appropriate measures.
In addition to being able to operate the machine more stably and efficiently, it also makes it possible to objectively understand the quality of adjustments during operation, and has the effect of allowing group management of high-speed looms to be performed more accurately and in a shorter time. .

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a diagram corresponding to the claims, Fig. 2 is a block diagram of the apparatus of the invention, Fig. 3 is an operation flowchart, and Fig. 4 is a schematic diagram of the weft insertion mechanism. Figures 5 to 14 are diagrams showing examples of frequency distribution tables output from the device of the present invention, and Figures 5 to 11 are examples of normally adjusted looms, and Figures 12 to 14 are diagrams showing examples of frequency distribution tables output from the device of the present invention. FIG. 14 is an example of a loom with abnormal or poorly adjusted parts. In the figure, 1, 1a, 1b...pressure sensor, 2, 2
a, 2b... Proximity switch, 3... Timing sensor, 4... Angle controller, 6... Data memory, 19... Nozzle, 20... Clamper, 33
...CPU, Pm...Maximum value of nozzle water pressure, Pco...
...Nozzle water pressure at the start of clamper opening, A...
Momentum of the injected water, θws...crank angle at the start of water injection, θw...duration of water injection expressed in crank angle,
θco... Clamper open start angle, θc... Clamper open angle.

Claims (1)

[Claims] 1 A water pressure detection sensor 1 of the weft insertion nozzle 19;
A sensor 2 for detecting the operation of the clamper 20, a means 6 for reading the detection values of the water pressure detection sensor 1 and the operation detection sensor 2 at each predetermined angle of the crankshaft in each pick, and storing the detected values for a plurality of picks. Diagnosis of the weft insertion mechanism of the water jet loom, comprising means 7 and 8 for creating and displaying a frequency distribution table for at least the maximum nozzle water pressure Pm and the clamper opening start angle θc ₀ from these stored values. Device.