JP5842889B2 - Air leak detection method for air jet loom - Google Patents

Description

  The present invention relates to an air leak detection method for a compressed air piping system in an air jet loom.

  In an air jet loom, there is a risk of air leakage due to breakage of valves, piping, or the like constituting a compressed air piping system, or improper assembly or adjustment of the piping system. When air leaks, the consumption of compressed air increases when wefts are inserted, and unnecessary compressed air flows out even when wefts are inserted, resulting in wasted energy. In addition, air leakage in the piping system reduces the flow rate and pressure of necessary compressed air and affects the weft insertion performance, which may make it difficult to continue the operation of the air jet loom.

  In order to prevent the influence of air leakage, for example, Patent Literature 1 discloses a method for detecting air leakage of compressed air in a piping system of an air jet loom. In Patent Document 1, a pipe connected to an air supply source is connected to a pipe on the air jet loom side through an on-off valve. On the air jet loom side, an on-off valve for compressed air supplied from an air supply source and a pressure gauge for measuring the original pressure of the compressed air are provided. On the downstream side of the pressure gauge of the original pressure, a pipe line connected to the main nozzle via the main regulator, main tank and main valve and a pipe line connected to the sub nozzle group via the sub regulator, sub tank and sub valve are provided. It has been. The on-off valve of the pipe connected to the air supply source, the main nozzle side pipe line, and the sub nozzle group side pipe line constitute a compressed air pipe system in the air jet loom. In the piping system, a pressure gauge for compressed air is provided in each of the main tank and the sub tank.

  In the invention of Patent Document 1, when the air jet loom is stopped, the on-off valve is closed to disconnect from the air supply source, and the pressure gauge measures the original pressure on the air supply source side, the main pressure of the main tank, and the sub pressure of the sub tank. Measure the reduced pressure state. The decompression pattern based on the decompression time of the measured original pressure, main pressure, and sub pressure is compared with a preset decompression pattern. If the pressure reduction patterns are different, it is determined that air leakage has occurred on the main tank side or the sub tank side, and necessary measures can be taken for the piping system.

JP2013-83016A

  The main regulator and the sub-regulator disclosed in Patent Document 1 have a function of keeping the pressure of the compressed air in the main tank and the sub-tank constant, and a manual regulator is generally used. In the case of a manual regulator, when the supply of compressed air from the air supply source is stopped and the supply of light wind is stopped, the pressure of the compressed air remaining in the piping system changes as shown in FIG. The original pressure P1 of the compressed air on the air supply source side is rapidly reduced as shown by a pressure line L11 indicated by a dotted line. Further, the main pressure P2 of the compressed air on the main tank side changes in a state where there is no change like the pressure line L12 indicated by the dotted line. After the reduced original pressure converges to the same pressure as the main pressure P2, the compressed air in the piping system maintains a substantially constant state as indicated by a pressure line L13 indicated by a dotted line. Therefore, as described in Patent Document 1, after the supply of compressed air from the air supply source is stopped, the air leak can be detected by measuring the pressure reduction pattern of the compressed air in the piping system with a pressure gauge. it can.

  However, a compressed air piping system in an air jet loom may use an electropneumatic regulator that automatically adjusts pressure by electrical pressure control instead of a manual regulator. The electropneumatic regulator is configured to adjust the pressure even after the air jet loom is stopped and the supply of compressed air from the air supply source is stopped.

  The electro-pneumatic regulator is set by the action of supplying compressed air to the air spring pressure adjusting part and the action of discharging the compressed air of the air spring pressure adjusting part and the compressed air on the outlet side of the electro-pneumatic regulator to the outside. Adjust the pressure to obtain the desired target pressure. For this reason, when the pressure of the compressed air in the piping system is measured with a pressure gauge after the supply of compressed air from the air supply source is stopped, the compressed air is as shown by the pressure line L23 shown by the solid line in FIG. The pressure is greatly reduced compared to the case of using a manual regulator. That is, the compressed air on the air supply source side is rapidly reduced from the original pressure P1 as indicated by the pressure line L21, and the compressed air on the main tank side being reduced from the main pressure P2 as indicated by the pressure line L22. Focus on pressure. Thereafter, the compressed air in the piping system is further reduced in pressure as indicated by the pressure line L23.

  Since the electropneumatic regulator continues the pressure control of the air spring pressure adjustment unit even after the air jet loom is stopped, the compressed air from the electropneumatic regulator is intermittently exhausted, and the compressed air in the piping system is The pressure reduction tendency is the same as when an air leak occurs when a manual regulator is used. Therefore, in an air jet loom that uses an electropneumatic regulator in the piping system, if the same reference value (threshold value) is used as when a manual regulator is used, it will be mistaken even though no air leakage has occurred. It will be detected.

  An object of the present invention is to accurately detect air leakage of an air jet loom using an electropneumatic regulator.

  Claim 1 includes a main air tank for storing compressed air supplied to the main nozzle, a sub air tank for storing compressed air supplied to the sub nozzle, a pipe connected to an air supply source having an original pressure on-off valve, and the air supply A compressed air piping system is configured by connecting a source, the main air tank, and the sub air tank via the original pressure on-off valve and an electropneumatic regulator, and the piping system is configured using a pressure gauge installed in the piping system. In the air leak detection method for an air jet loom for detecting air leak of the air jet loom, the air jet loom is stopped and the main pressure on-off valve is closed, and the pressure gauge is used to detect air leak in the piping system. The pressure control of the air spring pressure adjusting unit in the electropneumatic regulator is stopped during the period during which the pressure in the piping system is being measured.

  According to claim 1, even in an air jet loom using an electropneumatic regulator, it is possible to accurately detect an air leak in the piping system with a reference value equivalent to that when using a manual regulator.

  According to a second aspect of the present invention, the pressure gauge is installed in the main air tank and the sub air tank. According to the second aspect, it is possible to detect whether the air leakage of the piping system occurs on the main air tank side or the sub air tank side.

  According to a third aspect of the present invention, in the piping system, a light wind circuit having a throttle valve is connected to the main nozzle, and after closing the throttle valve, the pressure of the piping system is measured by the pressure gauge. . According to the third aspect, it is possible to eliminate the influence of the fine wind injected from the main nozzle during the detection of the air leakage, and it is possible to accurately detect the air leakage of the piping system.

  The present invention can accurately detect air leakage in an air jet loom using an electropneumatic regulator.

It is a schematic explanatory drawing which shows the piping system of the compressed air of an air jet loom. It is a schematic explanatory drawing of an electropneumatic regulator. It is an initial display screen explaining operation of air leak detection. It is a display screen which shows the air leak detection result at the time of normal. It is a display screen which shows the air leak detection result at the time of air leak. (A) The diagram which shows the pressure reduction change of the piping system which uses the manual regulator, (b) The diagram which shows the pressure reduction change of the piping system which uses the electropneumatic regulator.

  This embodiment is described based on FIGS. FIG. 1 is a block diagram showing a compressed air piping system 2 in a weft insertion device of an air jet loom 1. The air supply source 3 installed in the weaving factory is composed of related devices (not shown) such as an air compressor and a drier, and supplies compressed air to the individual air jet looms 1 through pipes 4. The pipe 4 is connected to a pipe 6 on the air jet loom 1 side through a source pressure on-off valve 5 that supplies and stops compressed air.

  In the air jet loom 1, the pipe 6 is connected to the pressure gauge 8 through the filter 7. The pressure gauge 8 measures the original pressure P1 (see FIG. 4) of the compressed air supplied from the air supply source 3. The original pressure P1 is set to be supplied at a pressure higher than the pressure used for the weft insertion of the air jet loom 1. The pipe 6 connected to the pressure gauge 8 is connected to the main air tank 10 via the electropneumatic regulator 9. The main air tank 10 is provided with a pressure gauge 11.

  The electropneumatic regulator 9 adjusts the original pressure P1 of the compressed air to the main pressure P2 (see FIG. 4) suitable for the weft insertion set in advance, and supplies the compressed air adjusted to the main pressure P2 to the main air tank 10. And store. The relationship between the main pressure P2 and the original pressure P1 is set so that P2 <P1. The pressure gauge 11 can measure the pressure of the compressed air stored in the main air tank 10 and check whether the compressed air is adjusted to the set main pressure P2. The main air tank 10 is connected to the main nozzle 13 via the main air valve 12 by the pipe 6, and the compressed air is supplied to the main nozzle 13 by the opening and closing operation of the main air valve 12, and the weft insertion is performed.

  The pipe 14 branched from the pipe 6 connecting the pressure gauge 8 and the electropneumatic regulator 9 is connected to the pipe 6 connecting the main air valve 12 and the main nozzle 13 via the throttle valve 15 to form a light wind circuit. ing. Therefore, a small amount of compressed air adjusted by the throttle valve 15 is always supplied to the main nozzle 13 while the weft insertion is stopped. The main nozzle 13 keeps the weft end after weft insertion in a stable state by constantly injecting a slight wind while weft insertion is stopped.

  On the other hand, the pipe 16 further branched from the pipe 6 connecting the pressure gauge 8 and the electropneumatic regulator 9 is connected to the sub air tank 18 via the electropneumatic regulator 17 having the same structure and function as the electropneumatic regulator 9. . The sub air tank 18 is provided with a pressure gauge 19. The electropneumatic regulator 17 adjusts the original pressure P1 of the compressed air supplied from the air supply source 3 to a sub pressure P3 (see FIG. 4) suitable for weft insertion. For this reason, the sub air tank 18 stores the compressed air adjusted to the sub pressure P3. The relationship between the sub pressure P3, the original pressure P1, and the main pressure P2 is set so that P3 <P1 and P3 = P2.

  The sub air tank 18 is connected to four sub air valves 20 arranged along the weft insertion direction by pipes 16 respectively. The sub nozzle group 21 divided into four groups in the weft insertion direction includes a plurality of sub nozzles, and each sub air valve 20 is connected to each sub nozzle of each sub nozzle group 21 by a pipe 16. Therefore, each sub nozzle group 21 is supplied with compressed air having a sub pressure P3 from the sub air tank 18 by the operation of each sub air valve 20 to perform weft insertion.

  The pressure gauges 8, 11, and 19 are electrically connected to a control device 23 having a function panel 22, and send measured compressed air source pressure P 1, main pressure P 2, and sub pressure P 3 data to the control device 23. Yes. The controller 23 stores various data based on the data transmitted from the pressure gauges 8, 11, 19, the set value, etc., and the data of the original pressure P 1, the main pressure P 2, and the sub pressure P 3. A calculation unit (not shown) that performs calculation is provided. Further, the control device 23 includes a time measuring means (not shown) for measuring the measurement time of the original pressure P1, the main pressure P2, and the sub pressure P3, and a power source for cutting off the power supply to the electropneumatic regulator 9 and the electropneumatic regulator 17. A blocking circuit (not shown) is provided. The control device 23 includes various programs necessary for operating the air jet loom 1 and transmits signals to the main air valve 12 and the sub air valve 20 at the time of weft insertion to control the start and stop of the weft insertion operation.

  The electropneumatic regulator 9 and the electropneumatic regulator 17 have the same structure. Therefore, in the present embodiment, the configuration of the electropneumatic regulator 9 will be described with reference to FIG. The electropneumatic regulator 9 includes an air spring pressure adjusting unit 24, a pilot type on-off valve 25, an exhaust valve 26, an air supply electromagnetic valve 27, and an exhaust electromagnetic valve 28. The air spring pressure adjustment unit 24 includes a diaphragm 29 disposed in the housing, a primary space 30 formed on one side of the diaphragm 29, and a secondary space 31 formed on the other side. The diaphragm 29 is displaced toward the primary space 30 side or the secondary space 31 side due to the difference between the pressure in the primary space 30 and the pressure in the secondary space 31.

  The primary side space 30 is connected to the supply solenoid valve 27 and the exhaust solenoid valve 28 via a pipe line 32. The supply solenoid valve 27 and the exhaust solenoid valve 28 are electrically connected to the control device 23, respectively, and perform an opening / closing operation according to a command from the control device 23. The air supply solenoid valve 27 is connected to the pipe 6 connected to the air supply source 3 through the pipe line 33. Therefore, when the air supply solenoid valve 27 is opened, the compressed air having the original pressure P <b> 1 is supplied to the primary side space 30 via the pipe line 32. The exhaust solenoid valve 28 includes an exhaust port 34 opened to the outside. When the exhaust solenoid valve 28 is opened, the compressed air in the primary side space 30 is released from the exhaust port 34 to the outside.

  The pilot type on-off valve 25 includes an inlet 35 connected to the pipe 6 on the air supply source 3 side and an outlet 36 connected to the pipe 6 on the main air tank 10 side. Further, since the pilot type on-off valve 25 is connected to the diaphragm 29 of the air spring pressure adjusting unit 24, the pilot type on-off valve 25 opens and closes by the displacement of the diaphragm 29. For example, the pilot-type on-off valve 25 opens when the primary side space 30 becomes higher in pressure than the secondary side space 31, and closes when the secondary side space 31 is in a balanced state with the primary side space 30 or becomes high pressure. To do. When the pilot type on-off valve 25 is opened, compressed air on the air supply source 3 side is supplied to the main air tank 10 side. The pipe 6 connected to the outlet 36 of the pilot type on-off valve 25 communicates with the secondary space 31 through a pipe line 37.

  The exhaust valve 26 includes a pipe line 38 communicating with the secondary space 31 and an exhaust port 39, and performs an opening / closing operation by displacement of the diaphragm 29, similar to the pilot type opening / closing valve 25. For example, the exhaust valve 26 is closed when the primary side space 30 is in a balanced state with the secondary side space 31 or is in a high pressure state. When the secondary side space 31 becomes higher than the primary side space 30, the exhaust valve 26 is opened, and the compressed air in the secondary side space 31, that is, the compressed air on the outlet 36 side of the pilot type on-off valve 25 is connected to the pipeline. 37 and the secondary side space 31 are discharged from the exhaust port 39.

  A pressure gauge 40 is installed in the pipe 6 connected to the outlet 36 of the pilot type on-off valve 25, and the pressure of the compressed air in the pipe 6 is constantly measured. The pressure gauge 40 is electrically connected to the control device 23, and transmits the measured compressed air pressure data to the control device 23. In the control device 23, the pressure of the compressed air stored in the main air tank 10 set in advance is stored, and the pressure data transmitted from the pressure gauge 40 is compared with the set pressure. Based on the comparison result, the control device 23 transmits a control signal to the supply solenoid valve 27 and the exhaust solenoid valve 28 to supply compressed air to the primary side space 30 and the compressed air in the primary side space 30. One of the actions to be released to the outside is selectively controlled.

  The electropneumatic regulator 9 always adjusts the pressure so that the pressure of the compressed air on the outlet 36 side of the pilot type on-off valve 25 becomes the set pressure stored in the control device 23. For example, when the pressure on the outlet 36 side is lower than the set pressure, the exhaust solenoid valve 28 is closed and the supply solenoid valve 27 is opened. When the air supply solenoid valve 27 is opened, high-pressure compressed air on the air supply source 3 side is supplied to the primary side space 30, and the diaphragm 29 is displaced to the secondary side space 31 side to close the exhaust valve 26. The pilot type on-off valve 25 is opened. By opening the pilot type on-off valve 25, the compressed air on the air supply source 3 side flows to the main air tank 10 side, and the pressure of the compressed air increases.

  When the pressure on the outlet 36 side is higher than the set pressure, the supply solenoid valve 27 is closed and the exhaust solenoid valve 28 is opened, and the compressed air in the primary space 30 is discharged from the exhaust port 34. . Also, high-pressure compressed air on the outlet 36 side flows into the secondary side space 31 to displace the diaphragm 29 toward the primary side space 30, maintaining the pilot type on-off valve 25 in the closed state and opening the exhaust valve 26. The compressed air on the outlet 36 side is discharged from the exhaust port 39 to the outside, and the pressure of the compressed air on the main air tank 10 side is lowered.

  An air leakage detection method in the air jet loom 1 provided with the piping system 2 using the electropneumatic regulator 9 and the electropneumatic regulator 17 will be described with reference to FIGS. A program related to air leak detection is set in the control device 23. After the operation of the air jet loom 1 is stopped, the function panel 22 is operated to display the initial display screen 41 of the air leak detection mode. The On the initial display screen 41, a pressure diagram screen 42 depicting a time axis and a pressure axis, a start button 43, and a comment screen 44 are displayed. On the pressure diagram screen 42, a preset reference pressure PS for judging air leakage is indicated by a one-dot chain line, and on the comment screen 44, a comment for prompting an operation for air leakage detection “main nozzle fine wind scale is zeroed. "Please press the start key and close the main pressure on-off valve" is displayed.

  On the initial display screen 41, based on the comments on the comment screen 44, the operator operates the throttle valve 15 of the breeze circuit to set the scale to zero and interrupts the flow of the breeze. Subsequently, when the start button 43 is pressed, the connection between the electropneumatic regulators 9 and 17 and the power source is interrupted by the command of the control device 23, the power supply to the electropneumatic regulators 9 and 17 is stopped, and air leakage is detected. Therefore, during the period when the pressure is measured by the pressure gauges 8, 11, and 19, the pressure control of the air spring pressure adjustment unit 24 in the electropneumatic regulators 9 and 17 is stopped. For this reason, the exhaust of compressed air resulting from the pressure control of the air spring pressure adjusting unit 24 in the electropneumatic regulators 9 and 17 is eliminated.

  Next, when the operator closes the main pressure on-off valve 5, the pressure gauges 8, 11, and 19 are used for the original pressure P1, the main pressure P2, and the sub pressure of the compressed air remaining in the piping system 2 for a predetermined time. P3 is measured. As shown in FIG. 4, the pressure line L3 of the original pressure and the pressure line L4 of the main pressure and the sub pressure based on the measurement data are displayed on the pressure diagram screen 42 along the time axis. In FIG. 4, the relatively high-pressure compressed air remaining on the air supply source 3 side flows out to the main air tank 10 and the sub air tank 18 side through the electropneumatic regulators 9 and 17 at the time of the initial measurement. For this reason, the high-pressure compressed air is rapidly reduced in pressure and converged from the original pressure P1 to the main pressure P2 and the sub pressure P3. After the original pressure P1 is reduced, the compressed air in the piping system 2 converged to the main pressure P2 and the sub pressure P3 is maintained in a pressure state higher than the reference pressure PS even after a predetermined time has elapsed. Therefore, the control device 23 determines that there is no air leakage, and displays the comment “No air leakage” on the comment screen 44.

  When the work related to air leakage detection is completed, the operator opens the original pressure on-off valve 5 on the air supply source 3 side, and the compressed air from the air supply source 3 is supplied to the piping system 2 of the air jet loom 1. The pressure gauge 8 measures the pressure of the compressed air in the pipe 6 and transmits a signal related to the pressure to the control device 23. When the control device 23 confirms that the pressure of the compressed air in the pipe 6 has returned to the original pressure P1 stored in advance by a signal from the pressure gauge 8, the control device 23 automatically turns on the electropneumatic regulators 9 and 17 and the power source. Connecting. The electropneumatic regulators 9 and 17 start the pressure control of the air spring pressure adjusting unit 24 by supplying electric power, and the compressed air adjusted to the set main pressure P2 and sub pressure P3 is supplied to the main air tank 10 and the sub air tank. 18 is supplied. With this series of operations, preparation for starting the weaving of the air jet loom 1 is completed. In addition, you may comprise so that the start of the electric power supply to the electropneumatic regulators 9 and 17 may be performed by operating the starting button of the air jet loom 1.

  In FIG. 5, pressure lines L3, L4, L5, and L6 when air leakage occurs are displayed on the pressure diagram screen 42. The pressure line L3 indicates the pressure change of the compressed air on the air supply source 3 side, the pressure line L4 indicates the pressure change of the compressed air on the main air tank 10 side, and the pressure line L5 indicates the pressure change of the compressed air on the sub air tank 18 side. A pressure line L6 indicates the pressure change of the compressed air in the piping system 2 after the pressures on the air supply source 3 side, the main air tank 10 side, and the sub air tank 18 side become the same.

In the pressure diagram displayed on the pressure diagram screen 42, the main pressure P2 is lower than the sub-pressure P3 as shown by the pressure line L4 at the time of the initial measurement. As indicated by the pressure line L3, the compressed air that rapidly depressurizes from the original pressure P1 and the compressed air that depressurizes from the sub pressure P3 as indicated by the pressure line L5 decreases from the main pressure P2 as indicated by the pressure line L4. Focus on the compressed air pressure. As shown by the pressure line L6, the compressed air in the piping system 2 after the convergence is further reduced in pressure with the passage of time and lowered to a pressure lower than the reference pressure PS. The control device 23 determines that the air leaks when the compressed air pressure in the piping system 2 drops below the reference pressure PS, and grasps the state where the main pressure P2 is lower than the sub pressure P3 at the initial measurement time. By doing so, it is determined that air leakage has occurred on the main air tank 10 side.

  The comment screen 44 displays a comment “There is an air leak (main nozzle)” indicating that an air leak has occurred on the main air tank 10 side. When an air leak is displayed on the comment screen 44, the operator can check the piping on the main air tank 10 side and repair the air leak immediately because the air leak location is displayed. When air leakage occurs on the sub air tank 18 side, the control device 23 indicates that the sub air tank 18 is on the pressure diagram screen 42 because the sub pressure P3 is lower than the main pressure P2 at the initial stage of measurement. It is possible to accurately determine that the side air leaks. When the air leak detection work and the repair work for the air leak location are completed, the air jet loom 1 completes preparation for weaving start by performing the same operations as the series of operations after the air leak detection work described in FIG. .

  In the present embodiment, the supply of electric power to the electropneumatic regulators 9 and 17 is interrupted, and the pressure control of the air spring pressure adjusting unit 24 is interrupted, whereby the air spring pressure adjusting unit 24 unique to the electropneumatic regulators 9 and 17 is stopped. Since exhaust of compressed air resulting from pressure control can be eliminated, accurate air leak detection can be performed. Further, by providing the main air tank 10 with the pressure gauge 11 and the sub air tank 18 with the pressure gauge 19, it is possible to determine whether the air leakage occurs on the main air tank 10 side or the sub air tank 18 side. It is possible to easily repair the leaked portion.

  The present invention is not limited to the configuration of the above-described embodiment, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

(1) In this embodiment, after the air jet loom 1 is stopped, the operation sequence of the throttle valve 15 of the light wind circuit, the source pressure on / off valve 5 on the air supply source 3 side, and the start button 43 on the initial display screen 41 is described in the specification. Not limited to the order of description, it can be changed freely.
(2) In the present embodiment, the pressure gauge 11 and the pressure gauge 19 do not need to be installed in the main air tank 10 and the sub air tank 18, and may be configured to be provided in the pipe 6 and the pipe 16.

(3) The present embodiment can be implemented in a configuration in which a breeze circuit that supplies a breeze to the main nozzle 13 is not installed.
(4) This embodiment can be implemented in a so-called multi-color air jet loom in which a plurality of main nozzles 13 are installed. In this embodiment, when a plurality of main air tanks 10 are installed for the plurality of main nozzles 13, it is preferable to provide a pressure gauge 11 for each main air tank 10.

(5) The pressure gauge 11 of the main air tank 10 and the pressure gauge 19 of the sub air tank 18 in this embodiment may be omitted from any one of the pressure gauges.
(6) In the present embodiment, the power supply to the electropneumatic regulators 9 and 17 is stopped, but the air supply is performed so as to temporarily invalidate the pressure control of the air spring pressure adjusting unit 24 in the electropneumatic regulators 9 and 17. The electromagnetic valve 27 for exhaust and the electromagnetic valve 28 for exhaust may be controlled. An open / close valve that closes when air leakage is detected may be provided in the pipe line 32.

DESCRIPTION OF SYMBOLS 1 Air jet loom 2 Piping system 3 Air supply source 5 Original pressure on-off valves 8, 11, 19 Pressure gauges 9, 17 Electropneumatic regulator 10 Main air tank 13 Main nozzle 15 Throttle valve 18 Sub air tank 21 Sub nozzle group 22 Function panel 23 Control device 24 Air spring pressure adjustment unit 25 Pilot type on-off valve 26 Exhaust valve 27 Supply solenoid valve 28 Exhaust solenoid valve 29 Diaphragm 30 Primary side space 31 Secondary side space 41 Initial display screen 42 Pressure diagram screen 43 Start button 44 Comments Screen L3, L4, L5, L6, L11, L12, L13, L21, L22, L23 Pressure line P1 Original pressure P2 Main pressure P3 Sub pressure PS Reference pressure

Claims (3)

A main air tank for storing compressed air to be supplied to the main nozzle; a sub air tank for storing compressed air to be supplied to the sub nozzle; a pipe connected to the air supply source is provided with a source pressure on-off valve; and the air supply source and the main air tank And the sub air tank is connected via the main pressure on-off valve and electropneumatic regulator to form a compressed air piping system, and an air leak in the piping system is detected using a pressure gauge installed in the piping system. In the air jet loom air leak detection method
While the air jet loom is stopped, the main pressure on-off valve is closed, and the electropneumatic regulator is used during a period in which the pressure of the piping system is measured by the pressure gauge in order to detect air leakage in the piping system. An air leak detection method for an air jet loom, characterized in that the pressure control of the air spring pressure adjustment unit in is stopped.   The air pressure detection method for an air jet loom according to claim 1, wherein the pressure gauge is installed in the main air tank and the sub air tank.   In the said piping system, the breeze circuit provided with the throttle valve in the said main nozzle is connected, and after closing the said throttle valve, the pressure of the said piping system is measured with the said pressure gauge, The Claim 1 or Claim characterized by the above-mentioned. Item 3. An air leak detection method for an air jet loom according to Item 2.

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