CN111380792B - Filter blockage detection device of air jet loom - Google Patents
Filter blockage detection device of air jet loom Download PDFInfo
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- CN111380792B CN111380792B CN201911335336.2A CN201911335336A CN111380792B CN 111380792 B CN111380792 B CN 111380792B CN 201911335336 A CN201911335336 A CN 201911335336A CN 111380792 B CN111380792 B CN 111380792B
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- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000003780 insertion Methods 0.000 claims abstract description 65
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- 235000014676 Phragmites communis Nutrition 0.000 description 12
- 238000002347 injection Methods 0.000 description 11
- 239000007924 injection Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 238000011144 upstream manufacturing Methods 0.000 description 9
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- 239000000523 sample Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 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
- 239000004753 textile Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
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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 blockage detection device of an air jet loom, which facilitates the setting of a threshold value for detecting the blockage of an air filter and can properly detect the blockage of the air filter even if 1 pressure sensor is used. The air jet loom introduces air compressed by a compressor, and performs weft insertion operation using the introduced air, and the filter clogging detection device includes: an air filter (26) provided in the air introduction section, a pressure sensor (27) provided on the downstream side of the air filter (26), and a clogging detection section (52) for detecting clogging of the air filter (26) on the basis of the difference between the 1 st air pressure detected by the pressure sensor (27) when 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 air flows through the air filter at the 2 nd flow rates of the 1 st flow rates.
Description
Technical Field
The present invention relates to a filter clogging detecting device for an air jet loom.
Background
In an air jet loom, weft yarn is inserted by flying weft yarn in the longitudinal direction of a reed by jetting air from a weft insertion nozzle. 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. An air pipe is connected to the air filter. The air pipe is a pipe for supplying compressed air generated by an air compressor to the air jet loom. The air filter is used for removing dust and the like contained in air.
In an air jet loom, if an air filter is clogged, pressure loss increases when air passes through the air filter. Therefore, the air pressure on the downstream side of the air filter is reduced as compared with the air pressure on the upstream side of the air filter. If the air pressure is reduced due to clogging of the air filter in this way, for example, there is a concern that weft insertion errors occur and the quality of the textile is reduced.
Accordingly, patent document 1 discloses a technique of providing a pressure switch on the downstream side of an air filter of an air jet loom, and detecting a pressure drop caused by clogging of the air filter by using the pressure switch. In the technique disclosed in patent document 1, an operation set value of a pressure switch is set to a threshold value in advance, and when the pressure at a detection position of the pressure switch falls below the threshold value due to a pressure decrease caused by clogging of an air filter, the operation of the air jet loom is automatically stopped.
Patent document 1: japanese Kokai publication Sho-63-24145
However, the technology disclosed in patent document 1 has the following problems.
In general, a plurality of air jet looms are installed in parallel in 1 plant (for example, see 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. Accordingly, the air piping connecting the compressor and each air jet loom is installed in the factory so as to meet the installation position of each air jet loom. In such a case, the length of piping from the compressor to the air jet loom varies depending on the position of the plant where the air jet loom is installed. Further, the pressure loss due to the air piping decreases as the piping length from the compressor to the air jet loom increases, and the pressure of the air supplied to the air jet loom through the air piping decreases. 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 jet loom. Under such circumstances, 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 air jet loom having different piping lengths. However, the degree to which the pressure loss due to the air piping occurs varies from one air jet loom to another, and therefore, it is difficult to appropriately set a threshold value for all air jet looms installed in a factory. In addition, the pressure of the compressed air (hereinafter, also referred to as "initial pressure") generated by the air compressor may vary depending on the setting of the air compressor. If the initial pressure changes, the pressure of the air supplied to each air jet loom changes, and therefore, the operation setting value of the pressure switch needs to be changed in response to the change. Therefore, setting of the threshold value becomes more difficult.
As means for solving such problems, it is conceivable to provide pressure sensors on both the upstream side and the downstream side of the air filter, and to detect clogging of the air filter based on a difference between a detection value of the pressure sensor on the upstream side and a detection value of the pressure sensor on the downstream side. In this case, although the difference in air pressure and the change in initial pressure due to the pipe length affect both the detection value of the upstream side pressure sensor and the detection value of the downstream side pressure sensor, the pressure difference therebetween has little effect. Therefore, even if the threshold value is not set individually for each air jet loom, the clogging condition 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 detecting device for an air jet loom, which facilitates setting of a threshold value for detecting clogging of an air filter and can appropriately detect clogging of the air filter even with 1 pressure sensor.
The present invention is a filter clogging detecting apparatus for an air jet loom which introduces air compressed by a compressor and performs weft insertion operation using the introduced air, the apparatus comprising: an air filter provided in the air introduction portion; a pressure sensor provided on the 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 that is greater than the 1 st flow rate.
In the filter clogging detecting apparatus for an air jet loom according to 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 detecting apparatus for an air jet loom according to the present invention, the 2 nd flow rate may be an air flow rate at the time of performing the weft insertion operation.
The filter clogging detecting apparatus for an air jet loom according to the present invention may include a weft insertion nozzle and a plurality of sub-nozzles disposed downstream of the weft insertion nozzle in the weft feeding direction, wherein the 2 nd flow rate is an air flow rate when a constant amount of air flows through the air filter by opening valves corresponding to at least 1 of the weft insertion nozzle and the plurality of sub-nozzles in a state where weft insertion operation is stopped.
The filter clogging detecting apparatus for an air jet loom according to the present invention may include an alarm unit that performs an alarm process when the clogging detecting unit detects clogging of the air filter.
According to the present invention, setting of a threshold value for detecting clogging of an air filter is facilitated, and clogging of an air filter can be appropriately detected even with 1 pressure sensor.
Drawings
Fig. 1 is a schematic view showing the structure 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 included in the air jet loom of fig. 1.
Fig. 3 is a schematic diagram showing the structure of a filter clogging detecting apparatus for an air jet loom according to embodiment 1 of the present invention.
Description of the reference numerals
1 … air jet loom; 6 … duplex nozzle (weft insertion nozzle); 7 … main nozzles (weft insertion nozzles);
8 … secondary nozzle; a 12 … main valve; 14 … double valve; 20 … lead-in; 22 … sub-valve; 26 … air filter; 27 … pressure sensor; 52 … blocking the detecting portion; 53 … alarm portion.
Detailed Description
< air jet loom >)
Fig. 1 is a schematic view showing the structure 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 plant. A plurality of air jet looms 1 are connected to the 1 compressors 101 via air pipes 102. The compressor 101 generates compressed air used in the air jet loom 1. The air pipe 102 distributes and supplies the air compressed by the compressor 101 to the plurality of air jet looms 1. Accordingly, the air pipe 102 is branched corresponding to the installation position 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 scale, but the structure of each air jet loom 1 is common.
The air jet loom 1 includes: a weft yarn cake 2, a weft yarn accumulating device 4, a weft yarn tension correcting 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. The air jet loom 1 further includes: the main valve 12, the double valve 14, the main tank 16, the main pressure gauge 17, the main regulator 18, the plurality of sub-valves 22, the sub-tank 23, the sub-regulator 24, the sub-pressure gauge 25, the air filter 26, the pressure sensor 27, the control unit 31, and the function panel 32.
The weft yarn cake 2 supplies 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 accumulating device 4 has a length measuring cylinder 41 and a locking pin 42. The weft accumulating device 4 winds and accumulates the weft yarn 11 supplied from the weft yarn cake 2 to the weft accumulating device 4 in the length measuring cylinder 41. The locking pin 42 is a pin capable of locking the weft yarn 11 used for weft insertion. The locking pin 42 is operated in a direction approaching or separating from the outer peripheral surface of the length measuring cylinder 41 by driving the electromagnetic solenoid 43. The control section 31 controls the driving of the electromagnetic solenoid 43. The locking pin 42 is operated in a direction approaching the outer peripheral surface of the length measuring cylinder 41, thereby holding the weft yarn 11. The locking pin 42 is operated in a direction away from the outer peripheral surface of the length measuring cylinder 41, and thereby the gripping of the weft yarn 11 is released.
The weft yarn tension correcting device 5 corrects the 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 conveying direction. In addition, a plurality of sub-nozzles 8 are arranged along the longitudinal direction of the reed 9.
The main nozzle 7 is connected to the main tank 16 via a main valve 12, and the double valve 14 is connected to the main tank 16 via a double valve 14. A main pressure gauge 17 and a main regulator 18 are connected to the main tank 16. The main regulator 18 adjusts 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 regulated by the main regulator 18. The main tank 16 stores air whose pressure is regulated by the main regulator 18. The air stored in the main tank 16 is supplied to the main nozzle 7 via the main valve 12 and to the duplex nozzle 6 via the duplex valve 14.
The duplex nozzle 6 injects air or stops injecting air according to the open/close state of the duplex valve 14. The main nozzle 7 injects air or stops injecting air according to the open/close 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.
Along the flight path of the weft yarn that flies in the longitudinal direction of the reed 9 by the ejection of air from the duplex nozzle 6 and the main nozzle 7, a plurality of sub-nozzles 8 are arranged. The respective sub-nozzles 8 impart a conveying force to the weft yarn 11 conveyed by the injection of air from the duplex nozzle 6 and the main nozzle 7 by the injection of air. The reed 9 performs a beating-up action every time 1 pick 11 is inserted. The beating-up operation is performed by the swinging operation of the reed 9.
Among the plurality of sub-nozzles 8, sub-nozzles 8 adjacent in the longitudinal direction of the reed 9 are set to 1 group. In addition, the number of groups of the sub-nozzles 8 varies depending on the textile width. Each group of sub-nozzles 8 is connected to a sub-tank 23 via a corresponding sub-valve 22. The sub tank 23 is connected to a sub regulator 24 and a sub pressure gauge 25. The primary regulator 18 and the secondary regulator 24 regulate the pressure of the air. The sub-pressure gauge 25 measures the pressure of the air regulated 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 the opening of each sub valve 22. Each sub-valve 22 is electrically connected to the control section 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 states of the respective sub-valves 22.
When air is injected from each of the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8 to insert the 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 according to the weaving width of the fabric.
As shown in fig. 2, the air filter 26 and the pressure sensor 27 are disposed in the air introduction portion 20. The introduction portion 20 is a portion for introducing air compressed by the compressor 101 and supplied through the air pipe 102. An 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 filter 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), 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 concerning weft insertion.
Fig. 3 is a schematic diagram showing the structure of a filter clogging detecting apparatus 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 to display various information on the user or manager of the air jet loom 1. The input unit 62 is used for inputting various information by a user or manager of the air jet loom 1.
The machine state detecting unit 51 detects the state of the machine of the air jet loom 1. The machine state detecting unit 51 detects whether or not the air jet loom 1 performs a weft insertion operation as a state of a machine 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 weft insertion operation, the double nozzle 6, the main nozzle 7, and the plurality of sub nozzles 8 repeat air injection and stop injection while respectively following the swinging 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, for example, when a weft break occurs. When the air jet loom 1 stops the weft insertion operation, the swinging 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, respectively. Accordingly, the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8 are all maintained in a state in which the injection of air is continued to be 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 even during the stop of the weft insertion operation. The breeze loop is provided for the purpose of maintaining the posture of the weft yarn 11.
The clogging detecting section 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 denoted by 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 which is greater than the 1 st flow rate is denoted by P2. In this case, the clogging detecting section 52 detects 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 of the air filter 26 has occurred is preset in the clogging detecting section 52. The threshold value is set according to the operating conditions of the air jet loom 1.
When the clogging detecting section 52 detects clogging of the air filter 26, the alarm section 53 performs a predetermined alarm process. As the alarm processing by the alarm unit 53, for example, a process 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 may be considered. The content of the alarm message may be any content as long as the user or manager of the air jet loom 1 can recognize that clogging has occurred in the air filter 26.
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 holding of the weft yarn 11 by the lock pin 42 for every 1 pick, and opens the main valve 12, the double valve 14, and the plurality of sub-valves 22 at predetermined timings. Thereby, air is ejected 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 transported in the longitudinal direction of the reed 9 by the ejection of the air. 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 ends. In this way, while the air jet loom 1 is performing the weft insertion operation, the double nozzle 6, the main nozzle 7, and the plurality of sub-valves 22 repeat the air injection and the stop injection in a predetermined cycle. For example, a machine operation signal is output by a signal output unit (not shown) of the control unit 31, and the state of the air jet loom 1 in which the weft insertion operation is performed is detected by the machine state detection unit 51, and the detection result is notified from the machine state detection unit 51 to the jam detection unit 52.
In contrast, for example, when the weft insertion operation of the air jet loom 1 is stopped due to 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 maintained in a state in which the injection of air is stopped. For example, a machine stop signal is output from a signal output unit (not shown) of the control unit 31, and the state in which the air jet loom 1 stops the weft insertion operation is detected by the machine state detection unit 51, 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 detecting unit 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 detecting unit 51. The order of reading the 1 st air pressure P1 and the 2 nd air pressure P2 may be any one.
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 kept closed. Therefore, the flow rate of air flowing through the air filter 26 at the time of stopping the weft insertion operation is extremely small, or practically zero. In this way, the condition that 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. Moreover, when 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 becomes almost the same pressure as the air pressure on the downstream side of the air filter 26. Therefore, the 1 st air pressure P1 detected by the pressure sensor 27 when the air jet loom 1 stops the weft insertion operation represents a pressure value equivalent to the air pressure on the upstream side of the air filter 26.
In contrast, when the air jet loom 1 performs the weft insertion operation, air is periodically ejected from each of the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8. Therefore, the flow rate of the air flowing through the air filter 26 when the weft insertion operation is performed is very large compared to the flow rate of the air when the weft insertion operation is stopped. In this way, the condition that the flow rate of the air flowing through the air filter 26 is large corresponds to the case that the air flows through the air filter 26 at the 2 nd flow rate. Moreover, when 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 at which a decrease occurs in accordance with the pressure loss caused by the air filter 26. In addition, the pressure loss caused by 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 reduced 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 the amount of pressure loss corresponding to the pipe length of the air pipe 102 from the pressure of the compressed air generated by the compressor 101. 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 clogging even if clogging occurs in the air filter 26. 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 weft insertion operation, and is strongly affected by clogging of the air filter 26. The 2 nd air pressure P2 is obtained by subtracting the pressure loss amount 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 caused by the air filter 26 and even the occurrence 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 caused by the clogging of the air filter 26.
Therefore, the jam detecting unit 52 obtains the difference Δpa 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, based on the expression Δpa=p1-P2. The clogging detecting section 52 compares the pressure difference Δpa obtained by the calculation with a threshold value set in advance for detecting clogging. Then, when the pressure difference Δpa is equal to or greater than the threshold value, the clogging detecting section 52 determines that clogging has occurred in the air filter 26. The determination result of the jam detection unit 52 is notified to the alarm unit 53.
The alarm unit 53 performs alarm processing when the clogging detection unit 52 detects clogging of the air filter 26. Thereby, the alarm message is displayed on the display unit 61 of the function panel 32. Therefore, the user or manager of the air jet loom 1 confirms the alarm message displayed on the display unit 61 to know that clogging has occurred in the air filter 26 and that the air filter 26 needs to be replaced.
In embodiment 1 of the present invention, the jam detecting unit 52 reads out from the pressure sensor 27, and detects 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 section 52 is configured to detect clogging of the air filter 26 based on a difference Δpa between the 1 st air pressure P1 and the 2 nd air pressure P2. In this structure, the difference Δpa 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, 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 Δpa between the 1 st air pressure P1 and the 2 nd air pressure P2 hardly changes. The 1 st air pressure P1 and the 2 nd air pressure P2 each 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 according to 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 described.
In comparison with embodiment 1 described above, in embodiment 2 of the present invention, the 2 nd flow rate applied when detecting the 2 nd air pressure is different. That is, in embodiment 1, the flow rate of 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, when the air jet loom 1 stops the weft insertion operation, the valve corresponding to at least 1 of the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8 is opened, and the air flow rate at which a constant amount of air flows through the air filter 26 is set to be the 2 nd flow rate. Hereinafter, the 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 controls the open/close states of the main valve 12, the double valve 14, and the plurality of sub-valves 22, thereby switching 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.
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 a closed state in a state where the weft insertion operation of the air jet loom 1 is stopped. Therefore, the 1 st flow rate is the flow rate of air flowing through the air filter 26 when the duplex nozzle 6, the main nozzle 7, and the plurality of sub-nozzles 8 stop the injection of 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 valve out of the main valve 12, the double valve 14, and the plurality of sub-valves 22 in a state where the weft insertion operation of the air jet loom 1 is stopped. Therefore, the 2 nd flow rate is an air flow rate when a constant amount of air is caused to flow through the air filter 26 by the injection of air from at least 1 nozzle among 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 at the time of the weft insertion operation. In addition, the 2 nd flow is more than the 1 st flow.
As a preferable example for flowing air through the air filter 26 at the 2 nd flow rate, in this embodiment, the control unit 31 sets the main valve 12 and the double valve 14 in a closed state, and opens only a part of the sub-valves 22 among the plurality of sub-valves 22. For example, only 3 sub-valves 22 among the 6 sub-valves 22 shown in fig. 1 are opened. Thereby, only the air is injected from the sub-nozzle 8 corresponding to the opened sub-valve 22, and a constant amount of air smaller than that during the weft insertion operation flows through the air filter 26 by the injection of the air. Here, only 3 sub-valves 22 are opened, but not limited to this, 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. 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 detecting unit 51 detects the stop of the weft insertion operation, the jam detecting unit 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 section 52 becomes the air pressure detected by the pressure sensor 27 when a very small amount of air flows through the air filter 26 or when the air hardly flows through the air filter 26. The 2 nd air pressure P12 read by the jam detecting unit 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 section 52 obtains the difference Δpb between the 1 st air pressure P11 and the 2 nd air pressure P12 read as described above from the expression Δpb=p11-P12. The clogging detecting section 52 compares the pressure difference Δpb obtained by the calculation with a threshold value set in advance for detecting clogging. Then, when the pressure difference Δpb is equal to or greater than the threshold value, the clogging detecting section 52 determines that clogging has occurred in the air filter 26. On the other hand, the alarm unit 53 performs alarm processing when the clogging detection unit 52 detects clogging of the air filter 26.
In embodiment 2 of the present invention, the air flow rate at which a constant amount of air flows through the air filter 26 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 is set to be the 2 nd flow rate. Further, the air filter 26 is detected to be clogged by the application of 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. In this structure, the 2 nd air pressure P12 is detected when a constant amount of air flows through the air filter 26, irrespective of the difference 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 operation conditions of the air jet loom 1.
< modification, etc. >)
The technical scope of the present invention is not limited to the above-described embodiments, and various modifications and improvements are included in the scope of deriving the specific effects obtained by the constituent elements of the invention and combinations thereof.
For example, in the above 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 thereto, and for example, the alarm message may be output by sound, or the alarm message may be displayed in parallel with the sound output. In addition, a process of outputting an alarm message to a portable device carried by a user or manager of the air jet loom 1 by sending a mail may also be applied.
In the above embodiment, the weft insertion operation is stopped when the weft yarn breakage occurs, but the trigger for stopping the weft insertion operation is not limited to the weft yarn breakage, and may be other factors (for example, the warp yarn breakage, the warp yarn bundle replacement, and the like).
Claims (6)
1. A filter clogging detecting apparatus for an air jet loom which introduces air compressed by a compressor and performs weft insertion operation using the introduced air,
the filter clogging detecting apparatus for an air jet loom is characterized by comprising:
an air filter provided in the air introduction portion;
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 result of comparison between a difference between a 1 st air pressure and a 2 nd air pressure, the 1 st air pressure being an air pressure detected by the pressure sensor when air flows through the air filter at a 1 st flow rate, and a threshold value for determining whether clogging of the air filter has occurred, the 2 nd air pressure being an 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 device for detecting clogging of a filter in an air jet loom according to claim 1, wherein,
the 1 st flow rate is an air flow rate at the time of stopping the weft insertion operation.
3. The filter clogging detecting apparatus for an air jet loom according to claim 1 or 2, characterized in that,
the 2 nd flow rate is an air flow rate when the weft insertion operation is performed.
4. The filter clogging detecting apparatus for an air jet loom as recited in claim 1, comprising:
weft insertion nozzle
A plurality of sub-nozzles disposed downstream of the weft insertion nozzle in the weft conveying direction,
the 2 nd flow rate is an air flow rate at which a constant amount of air flows through the air filter by opening valves corresponding to at least 1 nozzle 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 detecting apparatus for an air jet loom as recited in any one of claims 1, 2, 4, characterized in that,
the air filter device is provided with an alarm unit for performing alarm processing when the blockage detection unit detects blockage of the air filter.
6. The filter clogging detecting apparatus for an air jet loom as recited in claim 3, characterized in that,
the air filter device is provided with an alarm unit for performing alarm processing when the blockage detection unit detects blockage of the air filter.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2018244581A JP7263767B2 (en) | 2018-12-27 | 2018-12-27 | Filter clogging detector for air jet loom |
| JP2018-244581 | 2018-12-27 |
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| CN111380792A CN111380792A (en) | 2020-07-07 |
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| JPS5815895Y2 (en) * | 1974-04-03 | 1983-03-31 | 株式会社デンソー | Kuukiseijiyoukino Mezumarihiyoujisouchi |
| JPS5961287U (en) * | 1982-10-14 | 1984-04-21 | 津田駒工業株式会社 | Air jet loom stop control device |
| JP3607972B2 (en) | 1998-09-17 | 2005-01-05 | トヨタ自動車株式会社 | Diesel engine exhaust purification system |
| DE19951962A1 (en) | 1999-10-28 | 2001-05-03 | Festo Ag & Co | Filter device for filtering compressed air |
| CN2655213Y (en) * | 2003-08-04 | 2004-11-10 | 伍华本 | Pressure differential sensing system for detecting blocking state of filter |
| US8626456B2 (en) * | 2010-03-23 | 2014-01-07 | GM Global Technology Operations LLC | Methods for determining a remaining useful life of an air filter |
| CN102146606B (en) * | 2010-11-17 | 2012-06-27 | 江苏万工科技集团有限公司 | Air flow adjusting method and air flow adjusting device for auxiliary jet nozzle of loom |
| WO2012171840A2 (en) | 2011-06-15 | 2012-12-20 | Picanol | Air supply system for an airjet weaving machine |
| JP5780102B2 (en) * | 2011-10-11 | 2015-09-16 | 株式会社豊田自動織機 | Air leak detection method for air jet loom |
| WO2014209219A1 (en) * | 2013-06-28 | 2014-12-31 | Provtagaren Ab | Method for verifying correct function of sampling equipment |
| JP6324145B2 (en) | 2014-03-25 | 2018-05-16 | 株式会社三共 | Game machine |
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| JP2020105652A (en) | 2020-07-09 |
| CN111380792A (en) | 2020-07-07 |
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