CN111380792A - Filter blockage detection device of air jet loom - Google Patents
Filter blockage detection device of air jet loom Download PDFInfo
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- CN111380792A CN111380792A CN201911335336.2A CN201911335336A CN111380792A CN 111380792 A CN111380792 A CN 111380792A CN 201911335336 A CN201911335336 A CN 201911335336A CN 111380792 A CN111380792 A CN 111380792A
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- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/084—Testing filters
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Abstract
The invention provides a filter clogging detection device for an air jet loom, which facilitates setting of a threshold value for detecting clogging of an air filter and can properly detect clogging of the air filter even with 1 pressure sensor. The air jet loom introduces air compressed by a compressor and performs weft insertion operation by using the introduced air, and the filter clogging detection device includes: the air filter device comprises an air filter (26) arranged at an air inlet part, a pressure sensor (27) arranged at the downstream side of the air filter (26), and a blockage detection part (52) for detecting the blockage of the air filter (26) based on the difference between the 1 st air pressure detected by the pressure sensor (27) when the air flows through the air filter (26) at the 1 st flow rate and the 2 nd air pressure detected by the pressure sensor (27) when the air flows through the air filter at the 2 nd flow rate of a plurality of 1 st flow rates.
Description
Technical Field
The present invention relates to a filter clogging detection device for an air jet loom.
Background
In an air jet loom, air is ejected from a weft insertion nozzle, and weft yarns are thereby caused to fly in the longitudinal direction of a reed and inserted. An air jet loom includes an introduction portion for introducing air compressed by an air compressor. An air filter is provided in the introduction portion. Further, an air pipe is connected to the air filter. The air pipe is a pipe for supplying compressed air generated by the air compressor to the air jet loom. The air filter is used to remove dust and the like contained in air.
In the air jet loom, if the air filter is clogged, the pressure loss when the air passes through the air filter increases. Therefore, the air pressure on the downstream side of the air filter is reduced compared to the air pressure on the upstream side of the air filter. As described above, if the air pressure is reduced due to clogging of the air filter, for example, a weft insertion error may occur, which may reduce the quality of the woven fabric.
In view of this, patent document 1 discloses a technique in which a pressure switch is provided on the downstream side of an air filter of an air jet loom, and a pressure drop caused by clogging of the air filter is detected using the pressure switch. In the technique disclosed in patent document 1, the operation set value of the pressure switch is set in advance as a threshold value, and when the pressure at the detection position of the pressure switch drops below the threshold value due to a pressure drop caused by clogging of the air filter, the operation of the air jet loom is automatically stopped.
Patent document 1: japanese Kokoku publication Sho 63-24145
However, the technique disclosed in patent document 1 has the following problems.
Generally, a plurality of air jet looms are installed in parallel in 1 factory (see, for example, fig. 1 of patent document 1). In contrast, a compressor serving as a supply source of compressed air is shared by a plurality of air jet looms. Therefore, air pipes connecting the compressors to the respective air-jet looms are installed in the factory in accordance with installation positions of the respective air-jet looms. In such a case, the length of the pipe from the compressor to the air jet loom varies depending on the position of the air jet loom in the factory. Further, the pressure of the air supplied to the air jet loom through the air piping decreases as the length of the piping from the compressor to the air jet loom increases due to the pressure loss caused by the air piping. Therefore, even if the pressure of the compressed air generated by the compressor is the same, a difference occurs in the pressure of the air supplied to each air jet loom. In such a situation, in order to apply the technique disclosed in patent document 1, it is necessary to individually set a threshold value as an operation setting value of the pressure switch for each of the air jet looms having different pipe lengths. However, the degree to which the pressure loss due to the air piping occurs differs for each air jet loom, and therefore it is difficult to appropriately set the threshold value for all air jet looms installed in a factory. In addition, the pressure of the compressed air generated by the air compressor (hereinafter, also referred to as "initial pressure") may vary depending on the setting of the air compressor. When the initial pressure changes, the pressure of the air supplied to each air jet loom changes, and therefore, the operation set value of the pressure switch needs to be changed in accordance with the change. Therefore, setting of the threshold value becomes increasingly difficult.
As a means for solving such a problem, it is conceivable to provide pressure sensors on both the upstream side and the downstream side of the air filter and detect clogging of the air filter based on a difference between a detection value of the upstream pressure sensor and a detection value of the downstream pressure sensor. In this case, although a difference in air pressure or a change in initial pressure due to the length of the pipe affects both the detection value of the upstream side pressure sensor and the detection value of the downstream side pressure sensor, the difference in pressure therebetween is hardly affected. Therefore, even if the threshold value is not individually set for each air jet loom, the clogging of the air filter can be appropriately detected. However, the number of pressure sensors required for 1 air jet loom increases, which leads to an increase in cost.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a filter clogging detection device for an air jet loom, which facilitates setting of a threshold value for detecting clogging of an air filter, and which can appropriately detect clogging of the air filter even with 1 pressure sensor.
The present invention is a filter clogging detection device for an air jet loom that introduces air compressed by a compressor and performs a weft insertion operation using the introduced air, the filter clogging detection device for an air jet loom comprising: an air filter provided in the air introduction section; a pressure sensor provided on a downstream side of the air filter; and a clogging detecting unit that detects clogging of the air filter based on a difference between a 1 st air pressure detected by the pressure sensor when air flows through the air filter at a 1 st flow rate and a 2 nd air pressure detected by the pressure sensor when air flows through the air filter at a 2 nd flow rate larger than the 1 st flow rate.
In the filter clogging detection device for an air jet loom of the present invention, the 1 st flow rate may be an air flow rate at the time of stopping the weft insertion operation.
In the filter clogging detection device for an air jet loom of the present invention, the 2 nd flow rate may be an air flow rate when the weft insertion operation is performed.
The filter clogging detection device for an air jet loom according to the present invention may include a weft insertion nozzle and a plurality of sub-nozzles disposed on a downstream side in a weft yarn conveying direction from the weft insertion nozzle, and the 2 nd flow rate may be an air flow rate when a constant amount of air is caused to flow through the air filter by opening valves corresponding to at least 1 nozzle out of the weft insertion nozzle and the plurality of sub-nozzles in a state where the weft insertion operation is stopped.
The filter clogging detection device for an air jet loom according to the present invention may further include an alarm unit configured to perform an alarm process when the clogging detection unit detects clogging of the air filter.
According to the present invention, setting of the threshold value for detecting clogging of the air filter is made easy, and even 1 pressure sensor can appropriately detect clogging of the air filter.
Drawings
Fig. 1 is a schematic diagram showing a configuration of an air jet loom according to embodiment 1 of the present invention.
Fig. 2 is a diagram showing an arrangement of an air filter and a pressure sensor provided in the air jet loom of fig. 1.
Fig. 3 is a schematic diagram showing a configuration of a filter clogging detection device for an air jet loom according to embodiment 1 of the present invention.
Description of reference numerals
1 … air jet loom; 6 … duplex nozzle (nozzle for weft insertion); 7 … main nozzle (nozzle for weft insertion);
8 … secondary nozzle; 12 … main valve; 14 … double valve; 20 … an introduction part; 22 … secondary valve; 26 … air filter; 27 … pressure sensor; 52 … jam detector; 53 … alarm portion.
Detailed Description
< air jet loom >
Fig. 1 is a schematic diagram showing a configuration of an air jet loom according to embodiment 1 of the present invention.
In fig. 1, a compressor 101 is shared by a plurality of air jet looms 1. A plurality of air jet looms 1 are arranged side by side in 1 factory. A plurality of air jet looms 1 are connected to the 1 compressor 101 via an air pipe 102. The compressor 101 generates compressed air used in the air jet loom 1. The air piping 102 distributes and supplies the air compressed by the compressor 101 to the plurality of air jet looms 1. Therefore, the air piping 102 is branched in accordance with the installation positions of the plurality of air jet looms 1. In fig. 1, 1 of the plurality of air jet looms 1 is shown in an enlarged manner, but the structures of the respective air jet looms 1 are common.
The air jet loom 1 includes: the weft yarn device comprises a weft yarn cake 2, a weft yarn storage device 4, a weft yarn tension correction device 5, a duplex nozzle 6, a main nozzle 7, a plurality of auxiliary nozzles 8, a reed 9 for beating-up and a weft yarn probe 10. Further, the air jet loom 1 includes: a main valve 12, a double valve 14, a main tank 16, a main pressure gauge 17, a main regulator 18, a plurality of sub-valves 22, a sub-tank 23, a sub-regulator 24, a sub-pressure gauge 25, an air filter 26, a pressure sensor 27, a control portion 31, and a function panel 32.
The weft cake 2 feeds the weft yarn 11 used for weft insertion to the weft yarn accumulating device 4. The weft yarn accumulating device 4 accumulates weft yarns before weft insertion. The weft yarn accumulating device 4 has a length measuring cylinder 41 and a locking pin 42. The weft yarn accumulating device 4 winds the weft yarn 11 supplied from the weft yarn cake 2 to the weft yarn accumulating device 4 and accumulates the same in the length measuring tube 41. The locking pin 42 is a pin capable of locking the weft yarn 11 used for weft insertion. The electromagnetic solenoid 43 is driven to move the locking pin 42 in a direction to approach or separate from the outer peripheral surface of the length measuring cylinder 41. The control section 31 controls the driving of the electromagnetic solenoid 43. The locking pin 42 moves in a direction approaching the outer peripheral surface of the length measuring cylinder 41, thereby gripping the weft yarn 11. Further, the engagement pin 42 is operated in a direction away from the outer peripheral surface of the length measuring cylinder 41, thereby releasing the gripping of the weft yarn 11.
The weft tension correcting device 5 is a device for correcting tension applied to the weft yarn 11 so as not to apply excessive tension to the weft yarn 11. The duplex nozzle 6 and the main nozzle 7 constitute a weft insertion nozzle. The duplex nozzle 6 and the main nozzle 7 are disposed upstream of the reed 9 in the weft yarn conveying direction. The plurality of sub-nozzles 8 are disposed downstream of the main nozzle 7 in the weft yarn conveying direction. Further, the plurality of sub-nozzles 8 are arranged along the longitudinal direction of the reed 9.
The main nozzle 7 is connected to a main tank 16 via a main valve 12, and the double valve 14 is connected to the main tank 16 via the double valve 14. In addition, a main pressure gauge 17 and a main regulator 18 are connected to the main tank 16. The main regulator 18 regulates the pressure of compressed air (hereinafter, also simply referred to as "air") introduced into the air jet loom 1 through the air filter 26. The main pressure gauge 17 measures the pressure of the air adjusted by the main regulator 18. The main tank 16 stores air whose pressure is adjusted by a main regulator 18. The air accumulated in the main tank 16 is supplied to the main nozzle 7 via the main valve 12, and is supplied to the duplex nozzle 6 via the duplex valve 14.
The duplex nozzles 6 eject air or stop ejecting air according to the open-close state of the duplex valves 14. The main nozzle 7 injects air or stops injecting air according to the open-closed state of the main valve 12. The main valve 12 and the double valve 14 are electrically connected to the control unit 31. The control unit 31 controls the opening and closing operations of the main valve 12 and the double valve 14, respectively.
The plurality of sub-nozzles 8 are arranged along the flight path of the weft yarn flying in the longitudinal direction of the reed 9 by the ejection of air from the duplex nozzle 6 and the main nozzle 7. Each of the sub-nozzles 8 gives a conveying force to the weft yarn 11 conveyed by the air injection from the duplex nozzle 6 and the main nozzle 7 by the air injection. The reed 9 performs a beating-up operation every time a weft yarn 11 of 1 pick is inserted. The beating-up operation is performed by the swinging operation of the reed 9.
Of the plurality of sub-nozzles 8, 1 group of sub-nozzles 8 adjacent in the longitudinal direction of the reed 9 is provided. The number of sets of the sub-nozzles 8 varies depending on the weaving width. Each set of sub-nozzles 8 is connected to a sub-tank 23 via a corresponding sub-valve 22. A sub-regulator 24 and a sub-pressure gauge 25 are connected to the sub-tank 23. The main regulator 18 and the sub-regulator 24 regulate the pressure of the air. The sub pressure gauge 25 measures the pressure of the air adjusted by the sub regulator 24. The sub tank 23 stores air whose pressure is adjusted by the sub regulator 24. The air stored in the sub-tank 23 is distributed and supplied to the sub-nozzles 8 of each group by opening the sub-valves 22. Each sub-valve 22 is electrically connected to the control portion 31. The control unit 31 controls the opening and closing operations of the sub-valves 22. The sub-nozzles 8 of each group inject air or stop injecting air according to the open/close state of the corresponding sub-valve 22.
When air is injected from each of the duplex nozzle 6, the main nozzle 7, and the sub-nozzles 8 to insert a weft yarn 11, the weft yarn probe 10 detects whether or not the weft yarn 11 reaches a predetermined position set in advance. In the longitudinal direction of the reed 9, a predetermined position is set on the weft insertion terminal side which is the side far from the main nozzle 7 in accordance with the weaving width of the cloth.
As shown in fig. 2, the air filter 26 and the pressure sensor 27 are disposed in the air inlet 20. The introduction portion 20 is a portion into which air compressed by the compressor 101 and supplied through the air pipe 102 is introduced. One end of an air pipe 102 is connected to the air filter 26 provided in the introduction portion 20 using a joint 21. The air filter 26 is used to remove dust and the like contained in air supplied from the compressor 101 through the air pipe 102. The pressure sensor 27 is provided on the downstream side of the air filter 26. Specifically, as shown in fig. 1, a pressure sensor 27 is provided in a pipe 28 connecting the air cleaner 26 and the main regulator 18. The pressure sensor 27 detects the pressure of air on the downstream side of the air filter 26.
The control unit 31 controls the operation of the air jet loom 1. The control unit 31 is configured to include, for example, a central processing unit, a ROM (Read-Only Memory), a ram (random Access Memory), and the like. The function panel 32 is connected to the control unit 31 and is used for inputting and outputting various information related to weft insertion.
Fig. 3 is a schematic diagram showing a configuration of a filter clogging detection device for an air jet loom according to embodiment 1 of the present invention.
As shown in fig. 3, the control unit 31 includes a machine state detection unit 51, a jam detection unit 52, and an alarm unit 53. The function panel 32 includes a display unit 61 and an input unit 62. The display unit 61 is used for displaying various information to a user or a manager of the air jet loom 1. The input unit 62 is used for a user or a manager of the air jet loom 1 to input various information.
The machine base state detection unit 51 detects the state of the machine base of the air jet loom 1. The machine base state detection unit 51 detects whether the air jet loom 1 performs the weft insertion operation as the state of the machine base of the air jet loom 1. The detection result of the machine state detection unit 51 is notified to the jam detection unit 52.
When the air jet loom 1 performs the weft insertion operation, the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8 repeat the air injection and the air stop injection in response to the swing operation of the reed 9. On the other hand, when the air jet loom 1 does not perform the weft insertion operation, the air jet loom 1 stops the weft insertion operation. The control unit 31 stops the weft insertion operation of the air jet loom 1 when, for example, a weft yarn break occurs. When the air jet loom 1 stops the weft insertion operation, the swing operation of the reed 9 is kept in a stopped state, and the main valve 12, the double valve 14, and the sub-valve 22 are kept in a closed state. Therefore, the duplex nozzles 6, the main nozzles 7, and the plurality of sub-nozzles 8 are all maintained in a state in which the injection of air is continuously stopped. However, a breeze circuit, not shown, is connected to the main nozzle 7, and the breeze may continue to flow from the main nozzle 7 through the breeze circuit even during the stop of the weft insertion operation. The breeze circuit is provided for the purpose of maintaining the position of the weft yarn 11.
The clogging detection unit 52 detects clogging of the air filter 26 based on the detection result of the pressure sensor 27. Here, the 1 st air pressure detected by the pressure sensor 27 when the air flows through the air filter 26 at the 1 st flow rate is P1, and the 2 nd air pressure detected by the pressure sensor 27 when the air flows through the air filter 26 at the 2 nd flow rate that is greater than the 1 st flow rate is P2. In this case, the clogging detecting unit 52 detects the clogging of the air filter 26 based on the difference between the 1 st air pressure P1 and the 2 nd air pressure P2. A threshold value for determining whether or not clogging has occurred in the air filter 26 is set in advance in the clogging detection unit 52. The threshold value is set according to the operating conditions of the air jet loom 1.
When the clogging detection unit 52 detects clogging of the air filter 26, the alarm unit 53 performs a predetermined alarm process. As the alarm processing performed by the alarm unit 53, for example, processing of displaying an alarm message such as "air filter clogging" or an alarm message such as "air filter replacement timing" on the display unit 61 of the function panel 32 is conceivable. The content of the warning message may be any content as long as the user or the manager of the air jet loom 1 can recognize that the clogging of the air filter 26 has occurred.
Next, the operation of the air jet loom according to embodiment 1 of the present invention will be described.
First, when the air jet loom 1 performs the weft insertion operation, the control unit 31 releases the gripping of the weft yarn 11 by the locking pin 42 for every 1 pick, and opens the main valve 12, the double valve 14, and the sub valves 22 at predetermined timings. Accordingly, air is injected from the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8 at predetermined timings, and the weft yarn 11 is conveyed in the longitudinal direction of the reed 9 by the air injection. Then, at the stage when the end of the weft yarn 11 reaches the detection position of the weft yarn probe 10, the weft insertion of 1 picking process is ended. In this way, while the air jet loom 1 performs the weft insertion operation, the duplex nozzle 6, the main nozzle 7, and the plurality of sub-valves 22 repeat the injection of air and the stop of injection, respectively, in a predetermined cycle. For example, the machine state detector 51 detects the state in which the air jet loom 1 performs the weft insertion operation by outputting a machine operation signal from a signal output unit (not shown) of the controller 31, and the detection result is notified from the machine state detector 51 to the jam detector 52.
On the other hand, for example, when the air jet loom 1 stops the weft insertion operation in association with the occurrence of a weft break, the control unit 31 keeps the main valve 12, the double valve 14, and the plurality of sub-valves 22 in the closed state. Thereby, the duplex nozzle 6, the main nozzle 7, and the plurality of sub-valves 22 are all held in a state in which the injection of air is stopped. For example, the machine stop signal is output from a signal output unit (not shown) of the control unit 31, the machine state detection unit 51 detects a state in which the air jet loom 1 stops the weft insertion operation, and the detection result is notified from the machine state detection unit 51 to the jam detection unit 52.
On the other hand, the jam detector 52 reads the 1 st air pressure P1 detected by the pressure sensor 27 when the air jet loom 1 stops the weft insertion operation and the 2 nd air pressure P2 detected by the pressure sensor 27 when the air jet loom 1 performs the weft insertion operation, based on the detection result of the machine state detector 51. It is possible to read which of the 1 st air pressure P1 and the 2 nd air pressure P2 is in the order of first.
Here, when the air jet loom 1 stops the weft insertion operation, the main valve 12, the double valve 14, and the plurality of sub valves 22 are held in a closed state. Therefore, the flow rate of the air flowing through the air filter 26 when the weft insertion operation is stopped is extremely small or practically zero. Thus, the situation where the flow rate of the air flowing through the air filter 26 is small corresponds to the case where the air flows through the air filter 26 at the 1 st flow rate. Further, when the air flows through the air filter 26 at the 1 st flow rate, the influence of the pressure loss caused by the air filter 26 is extremely small. Therefore, the air pressure on the upstream side of the air filter 26 and the air pressure on the downstream side of the air filter 26 become almost the same pressure. Therefore, the 1 st air pressure P1 detected by the pressure sensor 27 when the air jet loom 1 stops the weft insertion operation indicates a pressure value equivalent to the air pressure on the upstream side of the air filter 26.
On the other hand, when the air jet loom 1 performs the weft insertion operation, air is periodically injected from each of the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8. Therefore, the flow rate of air flowing through the air filter 26 when performing the weft insertion operation is very large compared to the flow rate of air when stopping the weft insertion operation. The situation where the flow rate of the air flowing through the air filter 26 is large in this way corresponds to the case where the air flows through the air filter 26 at the 2 nd flow rate. Also, when the air flows through the air filter 26 at the 2 nd flow rate, the influence of the pressure loss caused by the air filter 26 is very large. Therefore, under the influence of the pressure loss caused by the air filter 26, the air pressure on the downstream side of the air filter 26 is lower than the air pressure on the upstream side of the air filter 26. Therefore, the 2 nd air pressure P2 detected by the pressure sensor 27 when the air jet loom 1 performs the weft insertion operation indicates a pressure value that has decreased in accordance with the pressure loss by the air filter 26. In addition, the pressure loss due to the air filter 26 increases when clogging of the air filter 26 occurs. Therefore, the pressure sensor 27 can be used to detect the air pressure that has decreased due to clogging of the air filter 26.
Here, the 1 st air pressure P1 and the 2 nd air pressure P2 will be described in further detail.
First, the 1 st air pressure P1 is an air pressure obtained by subtracting a pressure loss amount corresponding to the pipe length of the air pipe 102 from the pressure of the compressed air generated by the compressor 101. Further, since the 1 st air pressure P1 is the air pressure detected by the pressure sensor 27 when the flow rate of the air flowing through the air filter 26 is small due to the stop of the weft insertion operation, the 1 st air pressure P1 is hardly affected by the clogging even if the air filter 26 is clogged. Therefore, the 1 st air pressure P1 is determined by the pressure of the compressed air generated by the compressor 101 and the pressure loss corresponding to the pipe length of the air pipe 102.
On the other hand, the 2 nd air pressure P2 is the air pressure detected by the pressure sensor 27 when the flow rate of the air flowing through the air filter 26 is large due to the execution of the weft insertion operation, and is therefore strongly influenced by clogging of the air filter 26. The 2 nd air pressure P2 is an air pressure obtained by subtracting the pressure loss of the air filter 26 from the air pressure on the upstream side of the air filter 26. Therefore, the 2 nd air pressure P2 is determined not only by the pressure of the compressed air generated by the compressor 101 and the pressure loss corresponding to the pipe length of the air pipe 102 but also by the pressure loss due to the air filter 26 and the occurrence state of clogging of the air filter 26. Therefore, in the case where clogging of the air filter 26 occurs, the difference between the 1 st air pressure P1 and the 2 nd air pressure P2 indicates the degree of pressure loss due to the clogging of the air filter 26.
Therefore, the jam detector 52 obtains the difference Δ Pa between the 1 st air pressure P1 detected by the pressure sensor 27 when the air jet loom 1 stops the weft insertion operation and the 2 nd air pressure P2 detected by the pressure sensor 27 when the air jet loom 1 performs the weft insertion operation, by using the arithmetic expression of Δ Pa being P1-P2. The clogging detecting unit 52 compares the pressure difference Δ Pa obtained by the calculation with a threshold value set in advance for detecting clogging. When the pressure difference Δ Pa is equal to or greater than the threshold value, the clogging detection unit 52 determines that clogging has occurred in the air filter 26. The determination result of the jam detector 52 is notified to the alarm 53.
The alarm unit 53 performs an alarm process when the clogging detection unit 52 detects clogging of the air filter 26. Thereby, the alarm message is displayed on the display section 61 of the function panel 32. Therefore, the user or the manager of the air jet loom 1 confirms the alarm message displayed on the display unit 61 to know that the air filter 26 is clogged and the air filter 26 needs to be replaced.
In embodiment 1 of the present invention, the clogging detector 52 reads from the pressure sensor 27 the 1 st air pressure P1 detected by the pressure sensor 27 when a small amount of air flows through the air filter 26 due to the stop of the weft insertion operation and the 2 nd air pressure P2 detected by the pressure sensor 27 when a large amount of air flows through the air filter 26 due to the execution of the weft insertion operation. The clogging detecting unit 52 is configured to detect clogging of the air filter 26 based on the difference Δ Pa between the 1 st air pressure P1 and the 2 nd air pressure P2. In this structure, the difference Δ Pa between the 1 st air pressure P1 and the 2 nd air pressure P2 represents the pressure loss caused by clogging of the air filter 26. When the pressure of the air compressed by the compressor 101 changes, both the 1 st air pressure P1 and the 2 nd air pressure P2 change accordingly. Therefore, even if the pressure of the air compressed by the compressor 101 changes, the difference Δ Pa between the 1 st air pressure P1 and the 2 nd air pressure P2 hardly changes. Further, both the 1 st air pressure P1 and the 2 nd air pressure P2 include a pressure loss corresponding to the pipe length of the air pipe 102. Therefore, it is not necessary to change the threshold value for clogging detection in accordance with the pipe length of the air pipe 102. Therefore, setting of the threshold value for detecting clogging of the air filter 26 becomes easy. In addition, clogging of the air filter 26 can be appropriately detected using 1 pressure sensor 27.
Next, embodiment 2 of the present invention will be explained.
In comparison with the above-described embodiment 1, in embodiment 2 of the present invention, the 2 nd flow rate applied when the 2 nd air pressure is detected is different. That is, in embodiment 1 described above, the flow rate of the air flowing through the air filter 26 when the air jet loom 1 performs the weft insertion operation is set to the 2 nd flow rate. In contrast, in embodiment 2, the air flow rate when a constant amount of air flows through the air cleaner 26 is set to the 2 nd flow rate by opening the valves corresponding to at least 1 of the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8 in a state where the air jet loom 1 stops the weft insertion operation. The following description will be made in detail.
First, in embodiment 2, when the air jet loom 1 stops the weft insertion operation, the control unit 31 switches the flow rate of the air flowing through the air filter 26 from the 1 st flow rate to the 2 nd flow rate, or from the 2 nd flow rate to the 1 st flow rate by controlling the open/closed states of the main valve 12, the double valve 14, and the plurality of sub valves 22.
In this case, the 1 st flow rate is a flow rate of air flowing through the air filter 26 when the control unit 31 keeps the main valve 12, the double valve 14, and the plurality of sub-valves 22 in the respective closed states in a state where the air jet loom 1 stops the weft insertion operation. Therefore, the 1 st flow rate is a flow rate of air flowing through the air filter 26 when the dual nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8 stop injecting air. In this case, the 1 st flow rate is very small or practically zero.
On the other hand, the 2 nd flow rate is a flow rate of air flowing through the air filter 26 when the control unit 31 opens at least 1 of the main valve 12, the double valve 14, and the plurality of sub-valves 22 in a state where the air jet loom 1 stops the weft insertion operation. Therefore, the 2 nd flow rate is an air flow rate when a constant amount of air flows through the air filter 26 by the injection of the air from at least 1 of the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8. In this case, the 2 nd flow rate is larger than the 1 st flow rate and smaller than the constant air flow rate during the weft insertion operation. In addition, the 2 nd flow rate is greater than the 1 st flow rate.
As a preferable example for passing air through the air cleaner 26 at the 2 nd flow rate, in the 2 nd embodiment, the control unit 31 closes both the main valve 12 and the double valve 14, and opens only some of the plurality of sub-valves 22. For example, only 3 of the 6 sub-valves 22 shown in fig. 1 are opened. Accordingly, air is ejected only from the sub-nozzle 8 corresponding to the opened sub-valve 22, and a constant amount of air smaller than that in the weft insertion operation flows through the air filter 26 by the air ejection. Here, only 3 sub valves 22 are opened, but the present invention is not limited to this, and 1, 2, or 4 or more sub valves 22 may be opened. In addition, only the main valve 12 or only the sub-valve 22 may be opened. Further, the opening degree of the opened valve may be adjusted to be smaller than that in the weft insertion operation.
On the other hand, while the machine state detector 51 detects the stop of the weft insertion operation, the jam detector 52 reads the 1 st air pressure P11 detected by the pressure sensor 27 when the air flows through the air filter 26 at the 1 st flow rate and the 2 nd air pressure P12 detected by the pressure sensor 27 when the air flows through the air filter 26 at the 2 nd flow rate. At this time, the 1 st air pressure P11 read by the clogging detecting unit 52 is the air pressure detected by the pressure sensor 27 when a very small amount of air flows through the air cleaner 26 or when air hardly flows through the air cleaner 26. The 2 nd air pressure P12 read by the jam detector 52 is the air pressure detected by the pressure sensor 27 when a constant amount of air smaller than that during the weft insertion operation flows through the air filter 26.
Next, the clogging detecting unit 52 obtains the difference Δ Pb between the 1 st air pressure P11 and the 2 nd air pressure P12 read as described above by using the arithmetic expression of Δ Pb — P11-P12. The clogging detecting unit 52 compares the pressure difference Δ Pb obtained by the calculation with a threshold value set in advance for detecting clogging. When the pressure difference Δ Pb is equal to or greater than the threshold value, the clogging detection unit 52 determines that clogging has occurred in the air filter 26. On the other hand, the alarm unit 53 performs an alarm process when the clogging detection unit 52 detects clogging of the air filter 26.
In embodiment 2 of the present invention, the air flow rate when a constant amount of air flows through the air filter 26 is set to the 2 nd flow rate by opening the valves corresponding to at least 1 of the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8. Further, a configuration is adopted in which clogging of the air filter 26 is detected by using the 2 nd air pressure P12 detected when the air flows through the air filter 26 at the 2 nd flow rate by the pressure sensor 27. In this structure, the 2 nd air pressure P12 is detected when a constant amount of air flows through the air filter 26, regardless of differences in the operating conditions of the air jet loom 1. Therefore, the clogging of the air filter 26 can be detected without being affected by the operating conditions of the air jet loom 1.
< modification example et al >
The technical scope of the present invention is not limited to the above-described embodiments, and includes various modifications and improvements within a scope of deriving specific effects obtained by the components and combinations thereof of the present invention.
For example, in the above-described embodiment, the process of displaying the alarm message on the display unit 61 of the function panel 32 is exemplified as the alarm process performed by the alarm unit 53, but the present invention is not limited to this, and the alarm message may be output by voice, or the display of the alarm message and the voice output may be performed in parallel, for example. Further, a process of outputting an alarm message to a portable device carried by a user or a manager of the air jet loom 1 by sending a mail may be applied.
In the above-described embodiment, the weft insertion operation is stopped when a broken weft yarn occurs, but the timing of stopping the weft insertion operation is not limited to a broken weft yarn, and may be other factors (for example, a broken warp yarn, a warp bundle replacement, and the like).
Claims (5)
1. A filter clogging detecting device for an air jet loom which introduces air compressed by a compressor and performs weft insertion operation using the introduced air,
the filter clogging detection device for an air jet loom is characterized by comprising:
an air filter provided in the air introduction unit;
a pressure sensor provided on a downstream side of the air filter; and
and a clogging detecting unit that detects clogging of the air filter based on a difference between a 1 st air pressure detected by the pressure sensor when air flows through the air filter at a 1 st flow rate and a 2 nd air pressure detected by the pressure sensor when air flows through the air filter at a 2 nd flow rate that is greater than the 1 st flow rate.
2. The filter clogging detection apparatus for an air jet loom according to claim 1,
the 1 st flow rate is an air flow rate when the weft insertion operation is stopped.
3. The filter clogging detection apparatus for an air jet loom according to claim 1 or 2,
the 2 nd flow rate is an air flow rate when the weft insertion operation is performed.
4. The filter clogging detection device for an air jet loom according to claim 1, comprising:
weft insertion nozzle, and
a plurality of sub-nozzles disposed downstream of the weft insertion nozzle in a weft yarn conveying direction,
the 2 nd flow rate is an air flow rate when a constant amount of air is caused to flow through the air filter by opening the valve corresponding to at least 1 of the weft insertion nozzle and the plurality of sub-nozzles in a state where the weft insertion operation is stopped.
5. The filter clogging detection apparatus for an air jet loom according to any one of claims 1 to 4,
the air filter device is provided with an alarm unit which performs an alarm process when the clogging detection unit detects clogging of the air filter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-244581 | 2018-12-27 | ||
| JP2018244581A JP7263767B2 (en) | 2018-12-27 | 2018-12-27 | Filter clogging detector for air jet loom |
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| CN111380792A true CN111380792A (en) | 2020-07-07 |
| CN111380792B CN111380792B (en) | 2023-04-28 |
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| CN201911335336.2A Active CN111380792B (en) | 2018-12-27 | 2019-12-23 | Filter blockage detection device of air jet loom |
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| JP (1) | JP7263767B2 (en) |
| CN (1) | CN111380792B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941596A (en) * | 2021-02-16 | 2022-08-26 | 通用汽车环球科技运作有限责任公司 | System and method for engine air filter system diagnostics |
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| JPS5961287U (en) * | 1982-10-14 | 1984-04-21 | 津田駒工業株式会社 | Air jet loom stop control device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020105652A (en) | 2020-07-09 |
| JP7263767B2 (en) | 2023-04-25 |
| CN111380792B (en) | 2023-04-28 |
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