CN114808244B - Weft insertion device of air jet loom - Google Patents
Weft insertion device of air jet loom Download PDFInfo
- Publication number
- CN114808244B CN114808244B CN202210054006.1A CN202210054006A CN114808244B CN 114808244 B CN114808244 B CN 114808244B CN 202210054006 A CN202210054006 A CN 202210054006A CN 114808244 B CN114808244 B CN 114808244B
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- compressed air
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- main tank
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- pressure
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- 238000003780 insertion Methods 0.000 title claims abstract description 57
- 230000037431 insertion Effects 0.000 title claims abstract description 57
- 239000013589 supplement Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 17
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 235000014676 Phragmites communis Nutrition 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000009941 weaving Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009940 knitting Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012905 input function Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Classifications
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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
- D03D47/3026—Air supply systems
- D03D47/3033—Controlling the air supply
-
- 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
- D03D47/3066—Control or handling of the weft at or after arrival
-
- 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
- D03D47/3026—Air supply systems
- D03D47/3053—Arrangements or lay out of air supply systems
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
The pressure of the compressed air at the time of starting is reduced and the pressure fluctuation of the compressed air at the time of operation is suppressed to be smaller than before. The weft insertion device (100) is provided with: a1 st main tank (144M) that stores compressed air; an electro-pneumatic regulator (143) that adjusts the pressure of compressed air supplied from the air compressor (10) and supplies the air to the 1 st main tank (144M); a nozzle (142) that injects compressed air; a main valve (146) which is connected to the 1 st main tank (144M) via a1 st connection part (P144) and supplies compressed air stored in the 1 st main tank (144M) to the nozzle; and a2 nd main tank (144S) connected to the 1 st main tank (144M) via a2 nd connecting portion (P143S) different from the 1 st connecting portion (P144).
Description
Technical Field
The present invention relates to a weft insertion device for an air jet loom that uses compressed air for running a weft yarn, and more particularly, to a weft insertion device for an air jet loom that can reduce the pressure of compressed air at the time of starting and suppress the pressure fluctuation of compressed air at the time of operation.
Background
The air jet loom performs weaving by moving weft yarns in a direction orthogonal to warp yarns by jet of compressed air. In this case, in the case of woven fabrics with good weaving quality, it is important to constantly maintain the pressure of the compressed air and to bring the weft thread to a predetermined weft insertion position at a predetermined point in time.
Patent document 1: japanese patent application laid-open No. 2015-86976
Patent document 1 describes: in order to control the pressure of compressed air ejected from a nozzle in an air jet loom, an electro-pneumatic regulator is used to control the pressure of compressed air in a tank. The method described in patent document 1 aims to suppress pressure fluctuations of compressed air in a tank by appropriately setting a lower limit pressure that determines an operation time point of an air supply solenoid valve of an electro-pneumatic regulator.
However, there are the following problems: in the case of controlling the pressure of the compressed air in the tank using the electro-pneumatic regulator, if the flow rate of the compressed air injected from the nozzle becomes large, the pressure drop at the time of starting in the tank becomes large.
Fig. 5 shows the characteristic of the pressure change in the case where the flow rate of the compressed air injected from the nozzle is set to the standard state, and fig. 6 shows the characteristic of the pressure change in the case where the flow rate of the compressed air injected from the same nozzle is set to the maximum.
When the characteristic of fig. 5 is compared with the characteristic of fig. 6, it is found that a significant pressure drop occurs at the time of starting, which is not present in fig. 5, in the characteristic of fig. 6. Such a pressure decrease at start-up is considered to be due to: since a large flow rate of compressed air is used at the time of starting, the supply of compressed air from the compressed air supply source in the air compressor to the tank via the electro-pneumatic regulator is not sufficient.
On the other hand, it is conceivable to reduce the tank volume in order to suppress a decrease in the pressure in the tank at the time of starting. Fig. 7 shows the characteristics of the pressure change when the volume of the tank is 1/2 of that before the change and the flow rate of the compressed air injected from the nozzle is set to the maximum. The amount of pressure decrease at the time of start-up of fig. 7 is improved to β smaller than α shown in fig. 6.
However, in fig. 6, the pressure fluctuation during operation is γ, whereas in fig. 7, the pressure fluctuation during operation is changed to δ larger than γ. That is, the pressure drop at the time of starting is suppressed by reducing the tank volume, but the pressure fluctuation at the time of operation is deteriorated. In contrast to the fact that the electro-pneumatic regulator does not operate almost immediately after and after the start-up in fig. 6, the operation of supplying air and exhausting air is frequently performed during the operation in fig. 7. Frequent actuation of the electro-pneumatic regulator as shown in fig. 7 may shorten the life of the electro-pneumatic regulator.
Accordingly, in the weft insertion device for feeding the weft yarn by the compressed air injected from the nozzle, there are the following problems: it is extremely difficult to suppress both the pressure drop at the start-up of the compressed air in the tank and the pressure fluctuation of the compressed air at the operation.
Disclosure of Invention
The purpose of the present invention is to provide a weft insertion device for an air jet loom, which can reduce the pressure drop of compressed air at the time of starting and the pressure fluctuation of compressed air at the time of operation.
The weft insertion device of the air jet loom of the present invention comprises: tank 1 for storing compressed air; an electro-pneumatic regulator that adjusts the pressure of compressed air supplied from an air compressor and supplies the air to the 1 st tank; a nozzle that injects compressed air; a valve connected to the 1 st tank via the 1 st connection part, and supplying compressed air stored in the 1 st tank to the nozzle; and a2 nd tank connected to the 1 st tank via a2 nd connection portion different from the 1 st connection portion.
The 2 nd connection portion may be connected to a supply portion for supplying compressed air from the electro-pneumatic regulator to the 1 st tank.
The 2 nd connection portion may be directly connected to the 1 st tank.
When the volume of the 1 st tank is V1 and the volume of the 2 nd tank is V2, V1 < V2 may be satisfied.
When the flow resistance of the supply portion for supplying compressed air from the electro-pneumatic regulator to the 1 st tank is R1 and the flow resistance of the 2 nd connection portion is R2, R1 < R2 may be satisfied.
According to the weft insertion device of the air jet loom of the present invention, the pressure drop of the compressed air at the time of starting and the pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than the conventional one.
Drawings
Fig. 1 is a structural view showing a structure of a weft insertion device according to an embodiment.
Fig. 2 is a structural view showing a structure of a main adjuster of the weft insertion device according to the embodiment.
Fig. 3 is a structural view showing the structures of the 1 st main tank and the 2 nd main tank of the weft insertion device according to the embodiment.
Fig. 4 is an explanatory diagram showing the flow of compressed air in the tank of the weft insertion device according to the embodiment.
Fig. 5 is a characteristic diagram showing the pressure characteristics of the compressed air of the comparative example.
Fig. 6 is a characteristic diagram showing the pressure characteristics of the compressed air of the comparative example.
Fig. 7 is a characteristic diagram showing the pressure characteristics of the compressed air of the comparative example.
Fig. 8 is a characteristic diagram showing the pressure characteristics of compressed air according to the embodiment.
Fig. 9 is a block diagram showing a1 st modification of the tank of the weft insertion device according to the embodiment.
Fig. 10 is a block diagram showing a tank 2 of the weft insertion device according to the modification example.
Fig. 11 is a block diagram showing a3 rd modification of the tank of the weft insertion device according to the embodiment.
Description of the reference numerals
Air compressor; a weft insertion device; a control unit; CPU; function panel; a yarn feeding section; weft yarn length measuring and accumulating part; depositing drums; weft unwinding pins; balloon sensor; weft insertion nozzle; serial nozzles; primary nozzles; main regulator (electro-pneumatic regulator); main tank 1 (tank 1); main tank 2 (tank 2); pressure sensor; serial valve; main valve; brake. Reed; weft yarn path; 160. 160A-160 f. sub-nozzle groups; sub-regulators; 164. sub-tank; 164x. 165. 165A-165 f. sub-valves; 166. 166A-166F. End sensors; 1431. an air spring pressure adjustment; 1431a. 1431b. 1431d. 1432. a pilot-operated on-off valve; 1432out. 1433. an exhaust valve; 1433out. 1434 electromagnetic valve for air supply; 1435. an exhaust solenoid valve; 1435out. TL. braiding width; p10. piping; a pipe (supply site); P143S, P Sa, P143sb; p144. piping (1 st connection part); p145, P146..piping; p161. piping; p163. piping; m. the host system; s. subsystems; weft yarn.
Detailed Description
Hereinafter, an embodiment of a weft insertion device of an air jet loom will be described with reference to the drawings. In the drawings, the same parts are denoted by the same reference numerals.
First, the structure of the weft insertion device 100 of the air jet loom according to the embodiment will be described with reference to fig. 1. Fig. 1 is a block diagram showing a weft insertion device 100 of an air jet loom according to an embodiment.
In the present specification, the weft yarn is inserted into the warp yarn opening, and the opposite side to the weft insertion direction with respect to the weft insertion direction in which the weft yarn is conveyed is referred to as the upstream side and the weft insertion direction side is referred to as the downstream side. In the direction of the compressed air flow, the source flow side is the upstream side, and the opposite side to the source flow is the downstream side.
[ Structure of weft insertion device 100 ]
The weft insertion device 100 shown in fig. 1 mainly includes a control unit 110, a main system M, a subsystem S, a reed 150, and an end sensor 170. The weft insertion device 100 shown in fig. 1 is shown as a specific example in a state having one main system M, but may have two or more main systems M.
The control unit 110 is provided with a CPU111 and a function panel 112. The CPU111 executes various controls for the weft insertion operation of the weft insertion device 100 based on the mounted control program. The function panel 112 is a reporting section that reports various information, has a display function and an input function, displays various information based on the content instructed from the CPU111, and transmits the input information to the CPU111.
The main system M is provided with a yarn feeding portion 120, a weft yarn length measuring and accumulating portion 130, and a weft insertion nozzle 140. The yarn feeding portion 120 is provided on the upstream side of the weft yarn length measuring storage portion 130, and holds the weft yarn Y. The weft yarn Y of the yarn feeding section 120 is drawn out from the weft yarn length measuring and accumulating section 130.
The weft yarn length measuring and accumulating section 130 is provided with an accumulating drum 131, a weft yarn unwinding pin 132, and a balloon sensor 133. The accumulating drum 131 draws out the weft yarn Y of the yarn feeding section 120 and accumulates the weft yarn Y in a wound state. The weft unwinding pin 132 and the air bubble sensor 133 are disposed around the accumulating drum 131. The balloon sensor 133 is arranged on the unwinding direction side of the weft yarn Y with respect to the weft yarn unwinding pin 132.
The weft yarn unwinding pin 132 unwinds the weft yarn Y stored in the storage drum 131 at a loom rotation angle preset in the control unit 110. The balloon sensor 133 detects the weft yarn Y unwound from the accumulating drum 131 during weft insertion and sends a weft yarn unwinding signal to the control section 110. When receiving a weft unwinding signal of a predetermined number of turns, the control unit 110 brings the weft unwinding pin 132 into a locked state. Thereby, the weft yarn unwinding pin 132 locks the weft yarn Y unwound from the accumulating drum 131, and the weft insertion of the weft yarn Y ends. The operating time point for the weft yarn unwinding pin 132 to lock the weft yarn Y is set according to the number of winding turns required for depositing the weft yarn Y of a length corresponding to the knitting width TL on the depositing drum 131.
When the length of the weft yarn Y wound around the accumulating drum 131 by N turns corresponds to the knitting width TL, the control unit 110 receives the weft yarn unwinding signal from the balloon sensor 133N times, and transmits an operation signal for locking the weft yarn Y to the weft yarn unwinding pin 132. The weft yarn unwinding signal of the balloon sensor 133 is an unwinding signal of the weft yarn Y from the accumulating drum 131, and the control unit 110 recognizes the weft yarn unwinding signal of the balloon sensor 133 as a weft yarn unwinding time point based on the loom rotation angle signal obtained from the encoder.
As the weft insertion nozzles 140, a series nozzle 141 and a main nozzle 142 are provided. The tandem nozzle 141 draws out the weft yarn Y from the accumulating drum 131 by injection of compressed air. A brake 147 for braking the running weft yarn Y before the weft insertion is completed is provided on the upstream side of the tandem nozzle 141.
The main nozzle 142 inserts the weft yarn Y to the weft yarn passage 153 of the reed 150 by injection of compressed air. The main nozzle 142 is connected to a main valve 146 via a pipe P146. The main valve 146 is connected to a1 st main tank 144M as a1 st tank via a pipe P144 as a1 st connection portion.
The series nozzle 141 is connected to the series valve 145 via a pipe P145. The series valve 145 is connected to a1 st main tank 144M shared with a main valve 146 via a pipe P144. The series valve 145 and the main valve 146 may be directly connected to the 1 st main tank 144M without the pipe P144. In this case, the "1 st connection portion" of the present invention is a connection portion between the series valve 145, the main valve 146, and the 1 st main tank 144M.
The compressed air supplied from the air compressor 10 provided in the textile mill is pressure-regulated by the main regulator 143, and is supplied to the 1 st main tank 144M via the pipe P143M and stored. The pipe P143M functions as a supply portion for supplying compressed air from the main regulator 143 to the 1 st main tank 144M. The main regulator 143 is constituted by an electro-pneumatic regulator. The pressure sensor 144x detects the pressure of the compressed air stored in the 1 st main tank 144M, and transmits the detection result to the control unit 110. The pressure sensor 144x may be incorporated in the main regulator 143. In this case, the pressure of the 1 st main tank 144M can be estimated from the pressure on the downstream side of the main regulator 143.
The 1 st main tank 144M as the 1 st tank is connected to the 2 nd main tank 144S as the 2 nd tank via the pipe P143S. The pipe P143S provides flow path resistance and functions as a2 nd connection portion for delivering compressed air between the 1 st main tank 144M and the 2 nd main tank 144S. That is, the 2 nd main tank 144S is connected to the 1 st main tank 144M via a2 nd connection portion, i.e., a pipe P143S, which is different from the pipe P144 as the 1 st connection portion. Here, the pipe P143S as the 2 nd connection portion is connected to the pipe P143M which is a supply portion for supplying compressed air from the main regulator 143 as the electro-pneumatic regulator to the 1 st main tank 144M. The pipe P143S as the 2 nd connection portion may be directly connected to the 1 st main tank 144M.
The reed 150 is disposed downstream of the weft insertion nozzle 140 of the main system M, and is constituted by a plurality of reed teeth. The warp yarn is configured to pass between the plurality of reed dent. The weft passage 153 through which the weft yarn can travel is formed by the concave portions provided near the center in the up-down direction of the plurality of dents. Along the weft passage 153, the reed 150 is provided with a plurality of nozzles constituting the sub-nozzles 160 (hereinafter, a plurality of sub-nozzle groups 160) and an end sensor 170.
In the subsystem S, a plurality of sub-nozzle groups 160 are arranged along the weft passage 153 of the reed 150 so that the weft yarn Y moves through the weft passage 153 by injection of compressed air (hereinafter, referred to as "air injection"). As an example, the plurality of sub-nozzle groups 160 are divided into 6 groups, and each of the sub-nozzle groups 160A to 160F is composed of 4 sub-nozzles for each group.
Each of the sub-nozzle groups 160A to 160F is connected to a plurality of sub-valves 165 via a plurality of piping groups 166. The plurality of piping groups 166 are divided into 6 groups corresponding to the plurality of sub-nozzle groups 160, and each of the piping groups 166A to 166F is composed of 4 piping pieces for each group. The plurality of sub-valves 165 are constituted by sub-valves 165A to 165F in match with the respective pipe groups 166A to 166F, and are connected to a common sub-tank 164.
The sub tank 164 is connected to the sub regulator 162 via a pipe P163. The sub-regulator 162 is connected to the air compressor 10 in parallel with the main regulator 143 via a pipe P161. Accordingly, the sub-tank 164 stores compressed air whose pressure is adjusted by the sub-regulator 162. The pressure sensor 164x detects the pressure of the compressed air stored in the sub-tank 164, and transmits the detection result to the control unit 110. The pressure sensor 164x may be incorporated in the sub-regulator 162. In this case, the pressure of the sub-tank 164 can be pushed according to the pressure on the downstream side of the sub-regulator 162.
The end sensor 170 is disposed at a weaving end on a downstream side of the weft passage 153 and on a downstream side of the weaving width TL, and optically detects the weft yarn Y reaching the detection range. The end sensor 170 may include a light emitting portion, a light receiving portion, and a light guiding portion for detecting the weft yarn Y reaching the detection range. The end sensor 170 transmits a weft yarn detection signal generated by detecting the weft yarn Y to the control unit 110. The weft yarn end arrival signal based on the end sensor 170 is a weft yarn end arrival signal of the weft yarn Y, and is recognized as an end arrival time point by the control section 110.
[ Structure and action of Main regulator 143 ]
Next, the structure and operation of the main regulator 143 will be described in detail with reference to fig. 2. Fig. 2 is a structural view showing the structure of the main adjuster 143 of the weft insertion device 100 according to the embodiment.
The main regulator 143 is an electro-pneumatic regulator, and is mainly configured by an air spring pressure adjusting portion 1431, a pilot-operated on-off valve 1432, an exhaust valve 1433, an air supply solenoid valve 1434, and an exhaust solenoid valve 1435.
The diaphragm 1431d is disposed in the air spring pressure adjusting portion 1431 so as to divide the housing into two parts. Thus, the air spring pressure adjusting portion 1431 has a primary space 1431a formed on one side of the diaphragm 1431d and a secondary space 1431b formed on the other side. The diaphragm 1431d is displaced to a certain side due to a difference between the pressure in the primary side space 1431a and the pressure in the secondary side space 1431b. The primary space 1431a is connected to the air supply solenoid valve 1434 and the air discharge solenoid valve 1435 via a pipe P143 a.
The pilot-operated on-off valve 1432 includes an inlet 1432in connected to the pipe P10 on the air compressor 10 side and an outlet 1432out connected to the pipe P143M on the 1 st main tank 144M side. The pilot-operated on-off valve 1432 is connected to the diaphragm 1431d of the air spring pressure adjustment portion 1431, and performs an opening and closing operation in accordance with the displacement of the diaphragm 1431d.
For example, in the pilot-operated on-off valve 1432, if the primary side space 1431a is at a higher pressure than the secondary side space 1431b, the pilot-operated on-off valve 1432 is opened, and if the primary side space 1431a is at a pressure equal to the secondary side space 1431b or at a pressure lower than the secondary side space 1431b, the pilot-operated on-off valve 1432 is closed. When the pilot-operated on-off valve 1432 is opened, the inlet 1432in is connected to the outlet 1432out, and high-pressure compressed air on the air compressor 10 side is supplied to the 1 st main tank 144M side. The pipe P143M connected to the outlet 1432out of the pilot-operated on-off valve 1432 communicates with the secondary space 1431b through the pipe P143 b.
The exhaust valve 1433 includes a pipe P143c communicating with the secondary space 1431b and an exhaust port 1433out communicating with the atmosphere, and is opened and closed by displacement of the diaphragm 1431d, similarly to the pilot-operated on-off valve 1432.
For example, if the primary space 1431a is in equilibrium with the secondary space 1431b or is in a higher pressure state than the secondary space 1431b, the exhaust valve 1433 is closed. When the secondary space 1431b is at a higher pressure than the primary space 1431a, the exhaust valve 1433 is opened by displacement of the diaphragm 1431d. Accordingly, the compressed air in the secondary side space 1431b, that is, the compressed air on the outlet 1432out side of the pilot-operated on-off valve 1432 is discharged from the exhaust port 1433out via the pipe P143b, the secondary side space 1431b, and the pipe P143 c.
The air supply solenoid valve 1434 and the air discharge solenoid valve 1435 are opened and closed by a command from the control unit 110. The air supply solenoid valve 1434 is connected to a pipe P10 connected to the air compressor 10 via a pipe P143 b. Accordingly, when the air supply solenoid valve 1434 is opened, the compressed air of the original pressure is supplied to the primary space 1431a of the air spring pressure adjustment part 1431 via the pipe P143 a. The exhaust solenoid valve 1435 includes an exhaust port 1435out that is open to the outside. When the exhaust solenoid valve 1435 is opened, the compressed air in the primary side space 1431a of the air spring pressure adjusting portion 1431 is discharged from the exhaust port 1435out to the outside.
Therefore, when the pressure of the compressed air detected by the pressure sensor 144x is within a predetermined range, the main regulator 143 adjusts the pressure of the compressed air in the 1 st main tank 144M by the operation of the air spring pressure adjusting portion 1431, the pilot-operated on-off valve 1432, and the exhaust valve 1433. When the pressure of the compressed air detected by the pressure sensor 144x exceeds a predetermined range, the main regulator 143 greatly displaces the diaphragm 1431d by the operation of either the air supply solenoid valve 1434 or the air discharge solenoid valve 1435 that has received the command from the control unit 110. Due to the large displacement of the diaphragm 1431d, the pilot-operated on-off valve 1432 and the exhaust valve 1433 rapidly operate, and the pressure of the compressed air in the 1 st main tank 144M is rapidly adjusted.
[ Main tank 144M and Main tank 144S No. 2 ]
Next, the 1 st main tank 144M as the 1 st tank and the 2 nd main tank 144S as the 2 nd tank will be described with reference to fig. 3. Fig. 3 is a structural diagram showing the structures of the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment.
As shown in fig. 3, the 2 nd main tank 144S is connected to a part of the pipe P143M, which is a supply portion of the compressed air from the main regulator 143 to the 1 st main tank 144M, through the pipe P143S. The pipe P143S is a2 nd connection portion to which the flow path resistance is provided for connecting the 2 nd main tank 144S to the 1 st main tank 144M.
The compressed air whose pressure has been regulated by the main regulator 143 is stored in the 1 st main tank 144M through the pipe P143M, and is also stored in the 2 nd main tank 144S through the pipe P143M and the pipe P143S.
When the volume of the 1 st main tank 144M is V1 and the volume of the 2 nd main tank 144S is V2, the relationship of V1 < V2 is preferably satisfied. In addition, in the weft insertion device 100, when the volume of the existing main tank is Vorg, vorg=v1+v2 is preferably satisfied.
The flow path resistance of the pipe P143S is determined by the pipe diameter, the pipe diameter change, the pipe length, the friction in the pipe, whether or not the joint is bent, and the like. Namely, there is a tendency that: the flow path resistance increases due to the length of the pipe, the diameter of the pipe becoming thin, the friction in the pipe becoming large, bending, and the like.
Here, when the flow resistance of the pipe P143M, which is the supply portion of the compressed air from the main regulator 143 to the 1 st main tank 144M, is R1, and the flow resistance of the pipe P143S, which is the 2 nd connection portion to the 2 nd main tank 144S, is R2, it is preferable that the relation of R1 < R2 be satisfied. That is, the "flow path resistance imparted" in the pipe P143S means that the pipe P143M has a larger flow path resistance.
[ flow of compressed air at the 1 st main tank 144M and the 2 nd main tank 144S ]
Next, with reference to fig. 4, the flow of the compressed air in the 1 st main tank 144M and the 2 nd main tank 144S will be described in 3 steps (a) to (c). Fig. 4 is an explanatory diagram showing the flow of compressed air in the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment.
On the premise, the compressed air from the main regulator 143 is supplied to the 1 st main tank 144M through the pipe P143M, and is also supplied to the 2 nd main tank 144S through the pipe P143M and the pipe P143S. Thereby, the compressed air stored in the 1 st main tank 144M is kept at a predetermined pressure.
(a) The air injection of the main nozzle 142:
as shown in fig. 4 (a), the compressed air stored in the 1 st main tank 144M for weft insertion is injected from the main nozzle 142 via the main valve 146 (a 1).
At this time, the compressed air from the main regulator 143 passes through the pipe P143M to supplement the 1 st main tank 144M (a 2). The compressed air stored in the 2 nd main tank 144S passes through the pipe P143S and the pipe P143M to supplement the 1 st main tank 144M (a 3). As a result, compressed air from the tank of the total volume of the 1 st main tank 144M and the 2 nd main tank 144S is injected from the main nozzle 142.
(b) After air injection of the main nozzle 142 (1):
when the air injection from the main nozzle 142 is completed, as shown in fig. 4 (b), the compressed air from the main regulator 143 is supplied only to the side of the pipe P143M having a smaller flow resistance than the pipe P143S, and when the flow resistance of the pipe P143M, which is the supply (b 1) to the 1 st main tank 144M, is R1 and the flow resistance of the pipe P143S is R2, R1 < R2 is satisfied.
At this time, the compressed air from the main regulator 143 is not likely to flow toward the pipe P143S having a larger flow path resistance than the pipe P143M, and therefore, the compressed air is not supplied to the 2 nd main tank 144S. As a result, after the air is injected from the main nozzle 142, the pressure of the 1 st main tank 144M is quickly restored. Even when r1=r2 or R1 > R2, the pressure drop at the time of starting and at the time of operation can be suppressed as compared with the conventional art in which the 2 nd main tank 144S is not provided.
When the volume of the 1 st main tank 144M is V1 and the volume of the 2 nd main tank 144S is V2, V1 < V2 is satisfied, and the amount of pressure drop in the 1 st main tank 144M at the time of starting can be suppressed to be smaller. Even when v1=v2 or v1 > V2, the pressure drop at the time of starting and at the time of operation can be suppressed as compared with the conventional art in which the 2 nd main tank 144S is not provided.
(c) After air injection of the main nozzle 142 (2):
with the recovery of the pressure of the 1 st main tank 144M based on the above (b), as shown in fig. 4 (c), the compressed air from the main regulator 143 is supplied to the 1 st main tank 144M through the pipe P143M (c 1), and is also supplied to the 2 nd main tank 144S through the pipe P143M and the pipe P143S (c 2).
As described above, since the main tanks are divided into the 1 st main tank 144M and the 2 nd main tank 144S, the total volume of the compressed air of the 1 st main tank 144M and the 2 nd main tank 144S can be used when the air is injected from the main nozzle 142, and the pressure of the 1 st main tank 144M can be quickly recovered after the air is injected from the main nozzle 142. As a result, the pressure drop of the compressed air at the time of starting can be suppressed, and the pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than before.
[ pressure Property of compressed air ]
Next, the pressure characteristics of the compressed air will be described with reference to fig. 5 to 8. Fig. 5 to 7 are characteristic diagrams showing the pressure characteristics of the compressed air of the comparative example. Fig. 8 is a characteristic diagram showing the pressure characteristics of compressed air according to the embodiment. In each figure, the vertical axis represents the pressure of the 1 st main tank 144M, and the horizontal axis represents the time from before operation to start to time of operation.
Fig. 5 shows the characteristics of the pressure change in the case where the flow rate of the compressed air of the main nozzle 142 is set to the standard state in the weft insertion device of the comparative example having no 2 nd main tank but only 1 st main tank. In this case, the pressure fluctuation at the time of operation after the start is smaller than in any of the cases described later. In this case, the main regulator 143 does not use the air supply solenoid valve 1434 and the air discharge solenoid valve 1435.
Fig. 6 shows a characteristic of pressure change in the case where the flow rate of the compressed air of the main nozzle 142 is set to be maximum in the weft insertion device of the comparative example having no 2 nd main tank but only 1 st main tank. In the characteristic of fig. 6, at the time of starting, the air injection is repeated from the main valve 146 as an initial operation, and therefore, the pressure decrease amount is α, and a significant pressure decrease occurs. At this time, the main regulator 143 supplies compressed air to the tank based on a plurality of air supply signals from the control unit 110 and based on the air supply solenoid valve 1434. Therefore, the load of the main regulator 143 also becomes large. In fig. 6, the amount of pressure fluctuation during operation is reduced to γ smaller than α.
Fig. 7 shows a characteristic of a pressure change in the case where the volume of the 1 st main tank is set to 1/2 of fig. 6 and the flow rate of the compressed air of the main nozzle 142 is set to the maximum in the weft insertion device of the comparative example having no 2 nd main tank but only the 1 st main tank. In the characteristic of fig. 7, the volume of the 1 st main tank is 1/2 of that of fig. 6, so that the compressed air in the 1 st main tank can be replenished as early as possible at the time of starting, and the pressure decrease amount β smaller than α is improved with respect to the pressure decrease amount α shown in fig. 6.
On the other hand, during operation, the pressure fluctuation amount γ in fig. 6 is changed to 1/2 of the tank volume, and the pressure fluctuation amount δ larger than γ is changed in fig. 7. That is, the pressure drop at the time of starting is suppressed by reducing the tank volume, but the pressure fluctuation at the time of operation is deteriorated.
Fig. 8 is a characteristic diagram showing the pressure characteristics of the compressed air in the 1 st main tank 144M according to the embodiment. Here, in the weft insertion device according to the embodiment having the 1 st main tank 144M and the 2 nd main tank 144S, the total volume v1+v2 obtained by adding the volume V1 of the 1 st main tank 144M and the volume V2 of the 2 nd main tank 144S is set to be equal to the volume Vorg of the 1 st main tank of the conventional weft insertion device used in fig. 6 and 7.
In contrast to the pressure decrease amount at the time of starting in fig. 8, the pressure decrease amount α in fig. 6 can be improved to be smaller than the pressure decrease amount β in the same manner as in fig. 7 by making the volume of the 1 st main tank 144M about 1/2 of the volume Vorg of the conventional 1 st main tank so that the compressed air can be supplied into the tank as early as possible. Therefore, the main regulator 143 hardly uses the air supply solenoid valve 1434 and the air discharge solenoid valve 1435, and the load is reduced.
The pressure fluctuation amount at the time of operation in fig. 8 is the same as that in fig. 6 by setting the total volume v1+v2 obtained by adding the volume V1 of the 1 st main tank 144M and the volume V2 of the 2 nd main tank 144S to the volume Vorg of the conventional 1 st main tank to be the same. Therefore, the main regulator 143 hardly uses the air supply solenoid valve 1434 and the air discharge solenoid valve 1435, and the load is reduced.
In the pressure characteristic of fig. 8, the injection of the compressed air from the main nozzle 142 is performed so as to rapidly descend as in (a), then the compressed air is supplied only to the 1 st main tank 144M so as to rapidly stand as in (b), and then the compressed air is supplied to the 2 nd main tank 144S in addition to the 1 st main tank 144M, so that the pressure characteristic is temporarily and slowly lowered as in (c).
[ modification of connection of the 1 st main tank 144M and the 2 nd main tank 144S ]
A modified example of the connection between the 1 st main tank 144M and the 2 nd main tank 144S will be described below with reference to fig. 9 to 11.
Fig. 9 is a block diagram showing a1 st modification of the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment. In fig. 9, the 2 nd main tank 144S is separated from the pipe P144 as the 1 st connection portion, and is directly connected to the 1 st main tank 144M via the pipe P143Sb without via the pipe P143M which is a supply portion of compressed air from the main regulator 143 to the 1 st main tank 144M. In this modification, the pipe P143Sb functions as the 2 nd connection portion. The 2 nd main tank 144S can supply compressed air to the 1 st main tank 144M via the 1 st main tank 144M. In this case, the pipe P143Sb can be provided separately from the pipe P143M, and the arrangement of the 2 nd main tank 144S and the handling of the pipe can be facilitated.
Fig. 10 is a block diagram showing a2 nd modification of the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment. In fig. 10, the 2 nd main tank 144S is connected to the middle of the pipe P143M, which is the supply portion of compressed air from the main regulator 143 to the 1 st main tank 144M, via the pipe P143Sa, and is directly connected to the pipe P143M via a pipe P143Sb provided separately from the pipe P143M in the 1 st main tank 144M. In this case, since the compressed air is supplied to the 2 nd main tank 144S through the pipe as the 2 nd connection portion of the two systems of the pipe P143Sa and the pipe P143Sb, the adjustment range of the flow path resistance R2a of the pipe P143Sa and the flow path resistance R2b of the pipe P143Sb becomes large.
Fig. 11 is a block diagram showing a3 rd modification of the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment. In fig. 11, the 1 st main tank 144M and the 2 nd main tank 144S are separated by a partition wall W and are integrally configured. The 1 st main tank 144M and the 2 nd main tank 144S are directly connected to each other through a communication port H143MS provided in the partition wall W. Here, the communication port H143MS functions as a2 nd connection portion connected between the 1 st main tank 144M and the 2 nd main tank 144S. The diameter of the communication port H143MS is adjusted so that a flow path resistance R2 larger than the flow path resistance R1 of the pipe P143M can be obtained. The communication port H143MS may be a communication pipe using a pipe. In this case, the 1 st main tank 144M and the 2 nd main tank 144S can be separated by the partition wall W, and the structure and arrangement of the conventional weft insertion device can be utilized.
[ Effect obtained according to the embodiment ]
As described above, according to the embodiments of the present invention, the following effects can be obtained.
The weft insertion device 100 of the air jet loom of the present invention comprises: a1 st main tank 144M as a1 st tank, which stores compressed air; a main regulator 143 that adjusts the pressure of the compressed air supplied from the air compressor 10 and supplies the compressed air to the 1 st main tank 144M; a main nozzle 142 for injecting compressed air stored in a1 st main tank 144M; a main valve 146 connected to the 1 st main tank 144M via a pipe P144 as a1 st connection portion, and configured to supply the compressed air stored in the 1 st main tank 144M to the main nozzle 142; and a2 nd main tank 144S connected to the 1 st main tank 144M via a2 nd connection portion different from the 1 st connection portion, that is, a pipe P143S.
Since the 1 st main tank 144M and the 2 nd main tank 144S are divided in this way, the total volume of the compressed air of the 1 st main tank 144M and the 2 nd main tank 144S can be used when the air is injected from the main nozzle 142, and the pressure of the 1 st main tank 144M can be quickly recovered after the air is injected from the main nozzle 142. As a result, the amount of pressure drop of the compressed air at the time of starting can be suppressed, and the amount of pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than before.
The pipe P143S as the 2 nd connection portion is connected to the pipe P143M which is a supply portion for supplying compressed air from the main regulator 143 to the 1 st main tank 144M. That is, the 2 nd main tank 144S is connected to the middle of the pipe P143M, which is a supply portion for supplying compressed air from the main regulator 143 to the 1 st main tank 144M, via the pipe P143S as the 2 nd connection portion. In this case, the 2 nd main tank 144S can supply compressed air to the 1 st main tank 144M and receive compressed air from the main regulator 143. As a result, the amount of pressure drop of the compressed air at the time of starting can be suppressed, and the amount of pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than before.
The pipe P143Sb as the 2 nd connection portion is directly connected to the 1 st main tank 144M. That is, the 2 nd main tank 144S is directly connected to the 1 st main tank 144M via the pipe P143Sb serving as the 2 nd connecting portion, without via the pipe P143M for supplying compressed air from the main regulator 143 to the 1 st main tank 144M. In this case, the 2 nd main tank 144S can supply compressed air to the 1 st main tank 144M and receive compressed air from the 1 st main tank 144M. As a result, the amount of pressure drop of the compressed air at the time of starting can be suppressed, and the amount of pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than before.
When the volume of the 1 st main tank 144M is V1 and the volume of the 2 nd main tank 144S is V2, V1 < V2 is satisfied, and the amount of pressure drop in the 1 st main tank 144M at the time of starting can be suppressed to be smaller.
When the flow resistance of the pipe P143M, which is the supply point of the compressed air from the main regulator 143 to the 1 st main tank 144M, is R1 and the flow resistance of the pipe P143S to the 2 nd main tank 144S is R2, the pressure of the 1 st main tank 144M can be quickly restored after the air is injected from the main nozzle 142, and the pressure drop of the compressed air can be suppressed by satisfying R1 < R2.
In the above embodiment, the 1 st main tank 144M and the 2 nd main tank 144S are configured as main tanks, but the 1 st sub tank and the 2 nd sub tank may be configured as sub tank 164.
Claims (5)
1. A weft insertion device for an air jet loom is provided with:
tank 1 for storing compressed air;
an electro-pneumatic regulator that adjusts the pressure of the compressed air supplied from an air compressor within a predetermined range and supplies the compressed air to the 1 st tank;
a nozzle that sprays the compressed air; and
a valve connected to the 1 st tank via a1 st connection part and supplying the compressed air stored in the 1 st tank to the nozzle,
the weft insertion device of an air jet loom has a2 nd tank connected to the 1 st tank via a2 nd connection portion different from the 1 st connection portion, and stores compressed air, which is subjected to pressure adjustment in the predetermined range by the electro-pneumatic regulator, and supplements the 1 st tank with the compressed air, which is subjected to pressure adjustment in the predetermined range.
2. Weft insertion device for an air jet loom according to claim 1, characterized in that,
the 2 nd connection portion is connected to a supply portion for supplying the compressed air from the electro-pneumatic regulator to the 1 st tank.
3. Weft insertion device for an air jet loom according to claim 1, characterized in that,
the 2 nd connection portion is directly connected to the 1 st tank.
4. A weft insertion device for an air jet loom according to any one of claims 1 to 3, wherein,
when V1 is the volume of the 1 st tank and V2 is the volume of the 2 nd tank, V1 < V2 is satisfied.
5. A weft insertion device for an air jet loom according to any one of claims 1 to 3, wherein,
when the flow resistance of the supply portion for supplying the compressed air from the electro-pneumatic regulator to the 1 st tank is R1 and the flow resistance of the 2 nd connection portion is R2, R1 < R2 is satisfied.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021012705A JP7489003B2 (en) | 2021-01-29 | 2021-01-29 | Air jet weaving machine weft insertion device |
| JP2021-012705 | 2021-01-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114808244A CN114808244A (en) | 2022-07-29 |
| CN114808244B true CN114808244B (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210054006.1A Active CN114808244B (en) | 2021-01-29 | 2022-01-18 | Weft insertion device of air jet loom |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4036292B1 (en) |
| JP (1) | JP7489003B2 (en) |
| CN (1) | CN114808244B (en) |
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|---|---|---|---|---|
| US4932442A (en) * | 1988-07-12 | 1990-06-12 | Nissan Motor Co., Ltd. | Preliminary jet feedforward weft insertion control system for jet loom |
| US4967806A (en) * | 1989-04-05 | 1990-11-06 | Nissan Motor Co., Ltd. | Automatic weft picking control system for fluid jet loom |
| CN101613903A (en) * | 2008-06-23 | 2009-12-30 | 株式会社丰田自动织机 | Picking method and weft insertion device in the jet loom |
| CN103088526A (en) * | 2011-11-04 | 2013-05-08 | 株式会社丰田自动织机 | Weft insertion device of air jet loom |
| EP2352869B1 (en) * | 2008-10-22 | 2013-11-27 | Picanol | Method and device for monitoring an insertion system for a weaving machine |
| CN104514072A (en) * | 2013-09-26 | 2015-04-15 | 株式会社丰田自动织机 | Method for detecting air leakage in air-jet loom |
| JP2016172937A (en) * | 2015-03-17 | 2016-09-29 | 株式会社豊田自動織機 | Weft insertion control method in air-jet machine and weft insertion device in air-jet machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6119557B2 (en) | 2013-10-29 | 2017-04-26 | 株式会社豊田自動織機 | Compressed air pressure control device for air jet loom |
-
2021
- 2021-01-29 JP JP2021012705A patent/JP7489003B2/en active Active
- 2021-12-21 EP EP21216249.9A patent/EP4036292B1/en active Active
-
2022
- 2022-01-18 CN CN202210054006.1A patent/CN114808244B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4932442A (en) * | 1988-07-12 | 1990-06-12 | Nissan Motor Co., Ltd. | Preliminary jet feedforward weft insertion control system for jet loom |
| US4967806A (en) * | 1989-04-05 | 1990-11-06 | Nissan Motor Co., Ltd. | Automatic weft picking control system for fluid jet loom |
| CN101613903A (en) * | 2008-06-23 | 2009-12-30 | 株式会社丰田自动织机 | Picking method and weft insertion device in the jet loom |
| EP2352869B1 (en) * | 2008-10-22 | 2013-11-27 | Picanol | Method and device for monitoring an insertion system for a weaving machine |
| CN103088526A (en) * | 2011-11-04 | 2013-05-08 | 株式会社丰田自动织机 | Weft insertion device of air jet loom |
| CN104514072A (en) * | 2013-09-26 | 2015-04-15 | 株式会社丰田自动织机 | Method for detecting air leakage in air-jet loom |
| JP2016172937A (en) * | 2015-03-17 | 2016-09-29 | 株式会社豊田自動織機 | Weft insertion control method in air-jet machine and weft insertion device in air-jet machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7489003B2 (en) | 2024-05-23 |
| CN114808244A (en) | 2022-07-29 |
| EP4036292A1 (en) | 2022-08-03 |
| JP2022116513A (en) | 2022-08-10 |
| EP4036292B1 (en) | 2024-01-17 |
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