JPS62125047A - Operation condition control apparatus of fluid jet loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operating condition control device for a fluid injection type loom, and more specifically, a device for controlling operating conditions of a fluid jet loom by issuing a speed command for deceleration or speed increase during operation of the loom. The present invention relates to a device that controls to change operating speed conditions.

[Conventional technology]

The most common cause of fluid jet looms stopping was due to weft insertion errors, and each time the loom stopped, the supervisor had to repair the cause and restart it.

However, in recent years, improvements have been made in weft insertion methods and the frequency of stoppages has decreased significantly, so it has come to be the general rule that looms are operated continuously day and night, and in this case, working conditions and Due to personnel costs, the plant is operated unmanned at night, or only a small number of workers are assigned to monitor it. Therefore, in such an environment, if a weft insertion error occurs and the loom stops, it may not be possible to restart the loom, or it may take a long time to restart, resulting in a decrease in operating efficiency. In view of this IY situation, many weaving factories reduce the operating speed of the looms at night to allow more time for weft insertion, thereby creating conditions in which weft insertion errors are less likely to occur.

FIG. 3 illustrates a conventional control device for changing the operating speed conditions as described above for an air injection type loom.

In the figure, 1 is the loom and 2 is the #! & the reed of the machine, 3 is a main nozzle for air injection that moves together with this reed, 4 is an auxiliary nozzle for air injection that is arranged in front of the reed 2 and moves together with the reed, and 5 is a pressurized air source. . 6 is a feeding path for feeding injection air to the main nozzle 3, which includes, in order from the pressure air source 5 side, a manual pressure setting device 7, an air tank 8. An electromagnetic valve 9 and a mechanical timing valve IO are interposed. 1
1 is a feed path for feeding injection air to four rows of auxiliary nozzles, and a manual pressure setting device 12 is connected in order from the pressure air source 5 side.
, air tank 13. A solenoid valve 14 is interposed therebetween, and the solenoid valve 14 includes a plurality of mechanical timing valves 15a and 15b arranged in parallel.

15c... are connected to the corresponding auxiliary nozzle 4 or a group of the nozzles. Are solenoid valves 9 and 14 operating? The valve is opened by fI preparation operation, and while the loom is operating, the air from the pressure air source 5 is regulated to a constant value by the pressure setting devices 7 and 12, respectively, and then stored in the air tanks 8 and 13, and these stored air Pressure air is
Timing valve 10. and 15a.

Each time the valves 15b, 15c, etc. open, they are fed to the main nozzle 3 and the auxiliary nozzle 4, and are injected from the corresponding nozzles at a predetermined timing. Then, the weft yarn W is ejected into the shed by the jet airflow from the main nozzle 3, and is successively blown away by the jet airflow from the auxiliary nozzle to perform weft insertion.

On the other hand, 16 is a main motor, which operates together with the reed 2 and other weaving operating parts, as well as timing valves 10, 15a, 15b.
, 15 c , ---, etc.

Reference numerals 17 and 18 are AC power supply and speed control circuits for this main motor, respectively. The speed control circuit 18 includes an inverter 19. The speed setting device 20 is equipped with a speed setting device 20 and a clock 21, and the speed setting device 20 sets the normal operating speed of the loom, for example, 600R.
PM and a rotational speed of the main motor 16 corresponding to a low operating speed, for example, 500 RPM, and the clock 2
For example, from 8 o'clock in the daytime to 1 o'clock based on the time signal from 1
A regular speed command sh is output as a digital signal from 9 o'clock, and a low speed command Sl is output from 19 o'clock to 8 o'clock the next morning. The inverter 19 has a built-in rectifier and a chopper circuit, converts the alternating current of the power supply 17 into direct current, and then cuts it on and off according to the digital amount of the speed command sh or Sl, processes the pulsating current, and supplies power to the main motor 16. do. Therefore, the rotational speed of the main motor 16, and therefore the operating speed of the loom, are changed depending on whether it is day or night. Furthermore, clock 21
In some cases, this may be replaced with a manual selector switch.

〔problem〕

By the way, when the above-mentioned operation method is adopted, the nighttime production volume naturally decreases, so that sufficient satisfaction in terms of profitability cannot be obtained.

Therefore, an object of the present invention is to improve profitability.

[Means of invention]

A means of the present invention for solving the above problem is to provide a pressure regulating means in the injection fluid feeding path for changing the pressure condition of the feeding fluid in accordance with the speed command.

[Effect]

According to the above means, while a low speed command is being issued at night, the pressure regulating means lowers the pressure of the fluid to be supplied in response to the low speed command, so that the injection amount can be reduced accordingly.

That is, if the operating speed of the loom is reduced, a margin is created in the weft insertion time as described above, so the number of injection machines can be reduced by an amount commensurate with this margin. If the loom is an air injection type, the power consumption to create the pressurized air for the injection will be approximately twice that of the main motor, and if the loom is a water injection type, the power consumption will be approximately twice that of the main motor. In some cases, the costs required for water quality adjustment or wastewater treatment are enormous.
Reducing the consumption of these injection fluids greatly contributes to reducing the operating costs of machine a.

[Embodiment] FIG. 1 shows an example in which the present invention is implemented on the conventional loom. In this figure, parts common to those in FIG. 3 are given the same reference numerals and redundant explanations will be omitted.

30 is a pressure regulating means. In this pressure regulating means, 31 is a D/A converter which inputs the low speed speed command Sl issued as a digital signal from the speed setter 20 and converts it into an analog quantity. 32 and 33 are amplifiers with variable amplification rates that amplify the analog output of this D/A converter. 34 and 35 are pressure regulating valves using, for example, electro-pneumatic proportional control valves, which are interposed immediately after the pressure setting devices 7 and 12 in the feed paths 6 and 11, respectively, and the pressure regulating valve 34 is an increaser. In response to the output of the width device 32, the pressure regulating valve 3
5 reduces the feed air pressure of each corresponding feed path in response to the output of the amplifier 33.

The embodiment is as described above, and as in the case of a conventional speed condition variable loom, the regular operating speed during the day, for example 600 RPM, and the low operating speed during the night, for example 500 RPM, are set in the speed setting device 20 during the operation preparation stage. The optimum air pressure at the normal operating speed, for example 3 kg/cm', can be set using the pressure setting device 7 by setting the air pressure as described above or by trial weaving in the preparation stage.
and 12.

Furthermore, the optimum pressure conditions at low operating speeds are determined by the above-mentioned trial weaving. This determination can be made by transmitting five low-speed speed commands from the speed regulator 20 and testing the loom l at a low operating speed while adjusting the amplification rates of the amplification devices 32 and 33. Since the pressure regulating valves 34 and 35 reduce the feed air pressure of the respective feed paths 6 and 11 in accordance with the adjustment value, the pressure conditions can be set to the lowest possible range in which weft insertion errors do not occur. .

- The above pressure conditions according to the test results are approximately 2 for main nozzle 3.
kg/c rry', approx. 2 for 4 auxiliary nozzles
．． It was 2 kg/cm'.

Therefore, while the regular speed command sh is being issued during the day, the loom 1 is operated at high speed while being supplied with injection air at the regular pressure set in the pressure setting devices 7 and 12, and at night, the speed command When is switched to the low speed side 51, the pressure regulating means 30 receives this command and functions as described above, so that the low pressure injection air set to the W/3E valves 34 and 35 is supplied and the setting is completed. The vehicle is operated at a low speed.

FIG. 2 shows another embodiment, where the same reference numerals as in FIG. 3 indicate the same parts.

In FIG. 2, reference numeral 18a denotes a speed control circuit, which, like the circuit 18 in FIGS. 1 and 3, is connected to an inverter 19. Speed setter 20. In addition to providing a clock 21, a play 36 is interposed in the transmission path of the commonly used speed command sh. In this play, when the speed command sh is issued from the speed setter 20, it is temporarily suspended and a predetermined time delay is set.

Further, 37 and 38 are supply paths for supplying injection air from the pressurized air source 5 to the main nozzle 3 and the auxiliary nozzle 4, respectively. The setting devices 7 and 12 are excluded.

40 is a pressure regulating means. In this pressure regulating means, 41 is a D/A converter, which receives the speed command s from the speed setting device 20.
h and Sl are input, and high level and low level analog signals corresponding to these digital quantities are output. 4
2 and 43 are switching circuits that include a comparator and a switching element, and the switching circuit 42 connects to the high level output of the D/A converter 41;
3 become conductive in response to the same low level output. 44
and 45 are delay circuits constituted by, for example, an integrating circuit, which input the signals from the D/A converter 41 via switching circuits 42 and 43, respectively, and detect sudden rises or rises when the signal levels are switched. It buffers the downward trend and causes the transition to gradually increase or decrease.

Reference numerals 46, 47 and 48, 49 are amplifiers with variable lJ ratios connected to the respective rear stages of the delay circuits 44 and 45, and 50 and 51 are pressure regulating valves consisting of the electro-pneumatic proportional control valves. is interposed in the feed path 37 and the amplifier 4
6.48, and the same 51 is interposed in the feed path 38 and responds to the output of the amplifier 47.49.

This second embodiment is as described above.

In the above-mentioned trial weaving stage, when the speed setting device 20 first sends a commonly used speed command sh, a4'1 rotates at the commonly used high operating speed and the D/A converter 41 receives the high level analog signal. Therefore, the switching circuit 42 becomes conductive and the output is sent to the amplifier 4 via the delay circuit 44.
6 and 47. Here, by adjusting the amplification rates of these amplifiers and making the pressure regulating valves 50 and 51 respond to this, the optimum normal pressure is found, and in this state the above-mentioned amplification rate is set.

Next, when the speed command is switched to SfL on the low speed side, the switching circuit 43 becomes conductive, so the pressure at low speed is set by adjusting the amplifiers 48 and 49 in the same manner as above.

According to this embodiment, when the speed command is switched while the loom is in operation, the operation of the pressure regulating valves 50 and 51 is slowed down by the buffering action of the eight extension circuits 44 or 45, so that the pressure of the supplied air is gradually increased. change gradually or gradually. This eliminates the causes of weft insertion errors such as yarn wobbling during the switching transition period.

Furthermore, when the speed command is switched to sh on the regular side, the pressure regulating means 40 starts operating in response to this, whereas in the speed control circuit 18a, this command is temporarily suspended by the play 36, so that the loom The speed is increased with a time delay. This prevents the feed air from running out of pressure when switching from low speed to service speed.

If the loom is a water injection type, a bypass passage with a proportional control valve or the like interposed between the discharge side and the suction side of the water injection pump may be provided to achieve the same effect as in each of the above embodiments. A controller can be used to control the discharge flow rate and pressure.

〔effect〕

As explained above, the present invention changes the pressure conditions of the injected fluid according to the speed conditions when the loom is operated at low speeds at night, etc., so this greatly reduces operating costs. This will improve profitability.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a control system of a loom showing one embodiment of the present invention, Fig. 2 is an explanatory diagram of a control system of a loom showing another embodiment of the invention, and Fig. 3 is a diagram of a conventional control system of a loom. It is an explanatory diagram. 1... Air injection type loom 6.11... Injection air feeding path 7.12... Pressure setting device 16... Main motor 18.18a... Speed control circuit 20... Speed setting Container 30...Pressure regulating means 34.35
...Pressure regulating valve 37.3°8...Injection air supply path 40...Pressure regulating means 50.51...Pressure regulating valve sh...Common speed command 51...Low speed speed command

Claims (1)

[Claims] While the fluid injection loom (1) is operating, the speed command (Sh, Sl
) to change the operating speed conditions of the loom, the injection fluid feeding path (6, 11,
37, 38) are interposed with pressure regulating means (30, 40) for changing the pressure conditions of the feed fluid according to the speed command.