CN209906967U

CN209906967U - Weft insertion device of air jet loom

Info

Publication number: CN209906967U
Application number: CN201920252800.0U
Authority: CN
Inventors: 高超; 吉学齐; 陶广川
Original assignee: Shandong Rifa Textile Machinery Co Ltd
Current assignee: Shandong Rifa Textile Machinery Co Ltd
Priority date: 2019-02-27
Filing date: 2019-02-27
Publication date: 2020-01-07
Anticipated expiration: 2029-02-27

Abstract

The utility model discloses an air jet loom weft insertion device, including keeping off the yarn needle, supplementary main nozzle, the swing main nozzle, the weft detection ware, main gas bag, supplementary gas bag, solenoid valve controlling means, the master control computer, display input device, the encoder, auxiliary nozzle, supplementary spout the solenoid valve, a plurality of auxiliary nozzles constitute auxiliary nozzle group, the master control computer is connected with solenoid valve controlling means, display input device, encoder, weft detection ware electricity respectively, solenoid valve controlling means respectively with keep off yarn needle, solenoid valve one, solenoid valve two, supplementary spout solenoid valve electric signal connection, auxiliary main nozzle passes through solenoid valve one and is connected with main gas bag, the swing main nozzle passes through solenoid valve two and is connected with main gas bag, auxiliary nozzle passes through a corresponding supplementary spout the solenoid valve respectively and is connected with supplementary gas bag; the timing of the start and the end of the jet of the auxiliary nozzle can be dynamically adjusted, so that the jet compressed air can be used for weft insertion in a minimized and stable manner, and the labor capacity of operators is reduced.

Description

Weft insertion device of air jet loom

Technical Field

The utility model relates to an air jet loom technical field, in particular to air jet loom weft insertion device and automatic adjustment's method thereof can assist the opportunity that the nozzle sprays the beginning and spray the end by dynamic adjustment.

Background

The air jet loom is used for weft insertion by injecting compressed air through a main nozzle and an auxiliary nozzle. In the prior art, the injection angles of a main nozzle and an auxiliary nozzle are manually set in advance according to experience and are modified according to weaving conditions. This is most common, but the problem with such settings is: it is difficult to optimize the weft insertion, i.e. to achieve a stable weft arrival and a minimum compressed air consumption.

Patent document CN 102534953 a as a comparison document 1 provides a method of setting the injection period of the sub-nozzle of the air jet loom, which groups a plurality of sub-nozzles connected to an electromagnetic opening/closing valve to form a plurality of groups, wherein the plurality of groups are divided into groups on the downstream side and the upstream side consisting of 2 or more groups, and a midstream group composed of the remaining groups, the groups on the midstream and upstream sides being targeted, a reduction pattern of an injection period is defined for each target group in a unit of a predetermined period as 1, a plurality of injection amount reduction patterns (hereinafter, referred to as patterns) including the injection period reduction pattern for all the target groups are determined, and the patterns are stored in advance and set to be selectable arbitrarily, when setting the injection period of each sub-nozzle, the operator selects the mode and then the injection end time of the injection period can be corrected. The method corrects the injection ending time through a preset fixed reduction mode and a combination thereof, and the influence of the injection starting time is not taken into consideration. The existing defects are that: not only may the weft insertion fail to reach a steady state without the ejection start timing following adjustment, but also compressed air may be wasted.

Patent document CN03130899.6, which is a comparison document 2, provides an air jet weft yarn feeding control method in which, when a weft yarn is fed into a radial yarn opening through a main nozzle and sub-nozzles arranged in parallel and divided into a plurality of groups along a path along which the weft yarn flies, an upper limit value and a lower limit value of a weft arrival timing θ e are set, and correction means for outputting correction amounts Δ θ 1 and Δ θ 2 are set, and when the arrival timing θ e is later than the upper limit value, the correction means retards a set value θ 2n of an injection end period of the sub-nozzles to θ 2n + Δ θ 1, and when the arrival timing θ e is earlier than the lower limit value, the set value θ 1n of an injection start period is advanced to θ 1n — Δ θ 2. The most upstream set of sub-nozzles may not be the target of correction of the injection end period and the injection start period. In the prior art, the description of "advancing the set value θ 1n of the injection start period to θ 1n- Δ θ 2 when the arrival timing θ e is earlier than the lower limit value" is wrong, and it should be said that the set value is delayed to θ 1n- Δ θ 2 in the sense of common knowledge. The method is adjusted either before or after the lower limit value by increasing the time interval between the start of injection and the end of injection, which obviously increases the amount of compressed air used.

Patent document CN 1605669B, which is a comparison document 3, provides a weft insertion control device on a jet loom that controls the pressure of a high-pressure air supply tank using an average value based on the difference α between the average value of a plurality of detected single weft arrival times and a target arrival time, and controls the on/off timing of an electromagnetic valve in real time in the next weft insertion based on the difference β (β > α) between the detected single weft arrival time and the target arrival time. The method corrects the on/off timing of the next weft electromagnetic valve by using the difference between the single weft arrival time and the target arrival time, and is easy to carry in correction of large sudden fluctuation of the weft arrival time caused by unevenness caused by weft knot, thickness, fluff, reed friction, warp yarn hairiness blockage and the like under special conditions, so that the on/off timing of the electromagnetic valve fluctuates. In a special case, if a large deviation occurs in the arrival time of the weft and weft due to weft knots, thickness, fuzz, reed friction, warp hairiness blockage, etc., if the on/off timing of the next weft solenoid valve is corrected according to the large deviation, weft insertion failure of weft that can normally insert the next weft may be caused, which is a disadvantage of correcting the on/off timing of the next weft solenoid valve by using the single weft arrival time and the target arrival time.

SUMMERY OF THE UTILITY MODEL

The utility model provides a weft insertion device of an air jet loom, aiming at solving the problems in the prior art; the utility model is provided with a plurality of groups of auxiliary nozzles, so that the weft yarns can be introduced through the air injection action; the timing of injecting the compressed air to the auxiliary nozzle can be controlled by providing a plurality of electromagnetic valves; the timing of the start and the end of the jet of the auxiliary nozzle can be dynamically adjusted by setting the parameters of the auxiliary jet electromagnetic valve according to the flight characteristics of the weft yarn, so that the jet compressed air can be used for weft insertion in a minimized and stable manner, and the labor capacity of operators can be reduced.

The utility model provides a technical scheme that its technical problem adopted is:

a weft insertion device of an air jet loom comprises a yarn blocking needle, an auxiliary main nozzle, a swinging main nozzle, a weft detection detector, a main air bag, an auxiliary air bag, a solenoid valve control device, a main control computer, a display input device, an encoder, an auxiliary nozzle, an auxiliary jet solenoid valve and an auxiliary nozzle group consisting of a plurality of auxiliary nozzles, wherein the main control computer is respectively electrically connected with the solenoid valve control device, the display input device, the encoder and the weft detection detector;

the weft-detecting detector is used for detecting the arrival time of weft yarns;

the main control computer is used for counting the arrival time of the weft yarns for multiple times, calculating an average value, comparing the average value with a preset target value to obtain a difference value, calculating the adjustment amplitude of each electromagnetic valve according to the preset percentage of the difference value, and controlling the electromagnetic valve control device to adjust the opening and closing time of the electromagnetic valve according to a set mode;

the electromagnetic valve control device comprises an electromagnetic valve control circuit and a memory, and is used for receiving a main control computer instruction, controlling the opening and closing time of the electromagnetic valve and recording and storing the latest parameters;

the display input device is used for displaying the statistical data and setting related parameters, and the preset percentage and the set mode are set by the display input device.

The first electromagnetic valve, the second electromagnetic valve and the auxiliary spraying electromagnetic valve adopt opening/closing valves capable of changing the timing of conveying high-pressure air to the weft insertion nozzle.

The beneficial effects of the utility model

1. The weft insertion device of the air jet loom of the utility model is provided with a plurality of groups of auxiliary nozzles so as to introduce weft yarns through air jet action; and a plurality of electromagnetic valves capable of controlling the timing of injecting compressed air to the sub-nozzles. The main control computer is used for counting the arrival time of weft yarns for multiple times, calculating the average value, comparing the average value with a preset target value to obtain a difference value, calculating the adjustment amplitude of each electromagnetic valve according to the preset percentage of the difference value, and controlling the electromagnetic valve control device to adjust the opening and closing time of the electromagnet according to a set mode; receiving a main control computer instruction through an electromagnetic valve control device, and controlling the opening and closing time of the electromagnetic valve and recording and storing the latest parameters; and displaying the statistical data and setting related parameters through the input device. The utility model discloses a mesh air jet loom weft insertion device, according to woof flight characteristic, the opportunity that the nozzle injection begins and the injection finishes is assisted in dynamic adjustment, makes the compressed air of injection reach the minimizing and stable weft insertion that carries on, reduces operating personnel amount of labour simultaneously.

2. The utility model discloses an air jet loom weft insertion device and adjustment thereof, dynamic adjustment assist the nozzle to spray the opportunity that begins and spray the end, come the opening and the closing opportunity of adjustment control action solenoid valve to make actual woof arrival angle approach target woof arrival angle, guarantee that the weft insertion reaches the optimum, realizes stable woof arrival, thereby reduce compressed air consumption simultaneously and reduce energy consumption.

3. The utility model discloses the selection of effect solenoid valve can make and play the solenoid valve of effect variation in size to the wefting insertion and set for in a flexible way, for example preceding two sets of and back two sets of solenoid valves do not adjust.

4. And the utility model discloses can adjust simultaneously and spray the beginning and spray the finish time, can furthest practice thrift the compressed air use amount satisfying under the weft insertion condition. The defects of the comparison document 1 are overcome.

The utility model discloses a function quick adjustment when opening and closing of solenoid valve is assisted in the adjustment targets in place, and adjusts according to the predetermined percentage of difference and can not overshoot forever, can reach the angle to the target of reaching to the immediate vicinity, makes the wefting insertion more stable. The defects of the comparison file 2 are overcome.

Drawings

Fig. 1 is a schematic diagram of the principle structure of the present invention.

Fig. 2 is a page view of the opening angle setting of the yarn blocking needle and the first solenoid valve 31, the second solenoid valve 32 and the auxiliary spraying solenoid valves 33 to 36 of the present invention during operation.

Fig. 3 is an extended page of the auxiliary nozzle in fig. 2, which is set automatically and quickly.

Fig. 4 is an operation setting page for automatic angle adjustment of the auxiliary injection solenoid valve.

FIG. 5 is an expanded page of the custom mode of FIG. 4, in which the η value for each active solenoid valve can be set individually.

FIG. 6 is a real-time monitoring bar display with solenoid valve open and closed and weft arrival monitoring page.

Fig. 7 is a flow chart of the present invention.

In the figure: 1-weft yarn cylinder, 2-weft accumulator, 3-yarn blocking needle, 4-auxiliary main nozzle, 5-swing main nozzle, 6-weft yarn, 7-weft detector, 8-main air bag, 9-auxiliary air bag, 10-electromagnetic valve control device, 11-main control computer, 12-display input device, 13-encoder, 21-24-auxiliary nozzle group and 31-36-auxiliary spraying electromagnetic valve.

Detailed Description

Embodiments of the present invention are described below with reference to the drawings.

With reference to fig. 1 to 7, a weft insertion device of an air jet loom comprises a weft accumulator 2, a yarn blocking needle 3, an auxiliary main nozzle 4, a swinging main nozzle, a weft detecting detector 7, a main air bag 8, an auxiliary air bag 9, an electromagnetic valve control device 10, a main control computer 11, a display input device 12, an encoder 13, auxiliary nozzles 21-24, auxiliary spraying electromagnetic valves 31-36 and a plurality of auxiliary nozzles 21-24 which form an auxiliary nozzle group,

the main control computer 11 is respectively electrically connected with the electromagnetic valve control device 10, the display input device 12, the encoder 13 and the weft detecting detector 7, the electromagnetic valve control device 10 is respectively in electrical signal connection with the yarn blocking needle 3, the electromagnetic valve 31I, the electromagnetic valve II 32 and the auxiliary spraying electromagnetic valves 33-36, the auxiliary main nozzle 31 is connected with the main air bag 8 through the electromagnetic valve 31I, the swinging main nozzle 5 is connected with the main air bag 8 through the electromagnetic valve II 32, and the auxiliary nozzles 21-24 are respectively connected with the auxiliary air bag 9 through the corresponding auxiliary spraying electromagnetic valves 31-36.

The weft-detecting detector 7 is used for detecting the arrival time of weft yarns;

the main control computer 11 is used for counting the weft yarn arrival time of multiple times, calculating an average value, comparing the average value with a preset target value to obtain a difference value, calculating the adjustment amplitude of each electromagnetic valve according to the preset percentage of the difference value, and controlling the electromagnetic valve control device to adjust the opening and closing time of the electromagnetic valve according to a set mode;

the electromagnetic valve control device 10 comprises an electromagnetic valve control circuit and a memory, and the electromagnetic valve control device 10 receives a main control computer instruction and is used for controlling the opening and closing time of the electromagnetic valve and recording and storing the latest parameters;

the display input device 12 is used for displaying statistical data and setting related parameters, and the preset percentage and the set mode are set by the display input device.

In the attached figure 1, the weft yarn 6 passes through the weft bobbin 1 and then reaches the weft accumulator 2, the weft yarn 6 is wound by the weft accumulator 2 and released by a switch of the yarn blocking needle 3, wherein the weft yarn is released by powering on/off the yarn blocking needle 3, and the action is controlled and implemented by the instruction of the main control computer 11.

Weft threads 6 are pulled out and ejected from the weft accumulator 2 by means of jet streams from an auxiliary main nozzle 4 (or a fixed main nozzle) and an oscillating main nozzle 5 (or a main nozzle for short), and then subsequently ejected by a number of auxiliary nozzles 21-24 (which may be 1, 2, 3, 4 or 5 auxiliary nozzles). After successful weft insertion, the weft thread 6 is detected by a weft detector 7 within a preset angle range of the loom main shaft. The weft detecting signal from the weft detecting detector 7 is inputted to a main control computer 11, and the main control computer 11 selects to continue or stop the operation of the loom according to the relevant weft detecting signal.

The injection of high-pressure air for weft insertion on the auxiliary main nozzle 4 serving as a weft insertion nozzle is controlled by opening and closing the electromagnetic valve one 31. The injection of high-pressure air for weft insertion on the main nozzle 5 serving as a weft insertion nozzle is controlled by the opening and closing of the second electromagnetic valve 32. The injection of high-pressure air for weft insertion on the plurality of auxiliary nozzle groups 21-24 serving as weft insertion nozzles is controlled by the opening and closing of the electromagnetic valves 33-36.

The first electromagnetic valve 31, the second electromagnetic valve 32, and the auxiliary injection electromagnetic valves 33 to 36 are on/off valves capable of changing the timing of conveying high-pressure air to the weft insertion nozzle.

The on/off control of the auxiliary injection solenoid valves 31 to 36 is performed by controlling the solenoid valve control device 10 to output a command from the main control computer 11. The main control computer 11 controls the opening and closing of the auxiliary injection solenoid valves 31 to 36 according to a loom rotation angle detection signal obtained by the encoder 13 for loom rotation angle detection. The solenoid valve control device 10 is a power drive supply device for the solenoid valve.

The main air bag 8 supplies high-pressure air to the auxiliary main nozzle 4 and the swing main nozzle 5 through the first electromagnetic valve 31 and the second electromagnetic valve 32, respectively, and the auxiliary air bag supplies high-pressure air to the auxiliary nozzles 21 to 24 through the electromagnetic valves 33 to 36.

With reference to fig. 2 to 7, the present invention is realized by the following steps:

1) when the loom weaves for the first time, parameters of the auxiliary spraying electromagnetic valves 31-36 are set, the parameters comprise the opening angle and the opening duration angle of the first auxiliary spraying electromagnetic valve when weft insertion starts, the opening angle and the opening duration angle of the last auxiliary spraying electromagnetic valve when weft insertion ends, and the number n of the auxiliary spraying electromagnetic valves, namely the number of the auxiliary spraying electromagnetic valves in actual use, the opening angles and the opening duration angles of the auxiliary spraying electromagnetic valves between the first auxiliary spraying electromagnetic valve and the last auxiliary spraying electromagnetic valve are evenly distributed, and the opening angles and the opening duration angles are the closing angles.

Fig. 2 shows the opening angle setting page of the first yarn blocking needle and solenoid valve 31, the second solenoid valve 32 and the auxiliary spraying solenoid valves 33-36 of the present invention during operation, for example, color a corresponds to the first weft accumulator, color B corresponds to the second weft accumulator, etc., color a can be selected and then copied to all colors or a certain color. The angle setting when the loom starts can be used for taking other pages, and the description is omitted.

Fig. 3 is an extended page of the auxiliary nozzle in fig. 2, which is set automatically and quickly. The method comprises the steps of setting the opening angle and the opening continuous angle of a first auxiliary spraying electromagnetic valve when weft insertion starts, setting the opening angle and the opening continuous angle of a last auxiliary spraying electromagnetic valve when weft insertion ends, and setting the number n of auxiliary spraying valves, namely the number of actually used auxiliary spraying electromagnetic valves. The opening angle and the opening continuous angle of each auxiliary spraying electromagnetic valve in the middle are evenly distributed (a decimal point is rounded to an integer), and the opening angle plus the opening continuous angle is the closing angle. For example, the opening angle of the weft insertion start is a1, the opening lasts A1 degrees, the opening angle of the weft insertion end is An degrees, the opening lasts An degrees, and the number of valves is n, so that the opening angle of the mth auxiliary injection electromagnetic valve is am which is a1+ (An-a1)/(n-1) which is m-1, wherein m is more than or equal to 1 and less than or equal to n; the opening continuous angle of the mth auxiliary injection electromagnetic valve is A1+ (An-A1)/(n-1) × (m-1); the closing angle of the mth auxiliary spraying electromagnetic valve is Am + Am.

2) The auxiliary jet electromagnetic valve automatically adjusts parameter setting, and the parameters comprise a weft detecting confirmation angle theta, a sampling range theta', a preset percentage eta, a target arrival angle alpha and a sampling period T.

Fig. 4 is a page of operation setting for automatic angle adjustment of the auxiliary injection solenoid valve. The weft feeler confirmation angle Θ e (x, y) is the interval angle of the detected weft yarn at which the weft feeler 13 is open. In the figure, "auxiliary spray electromagnetic valve automatic adjustment: ON/OFF' refers to the use or non-use of the auto-adjustment function. The target arrival angle alpha, or the expected arrival angle, refers to a preset expected weft arrival angle, that is, an angle at which weft insertion of weft is expected to be completed according to experience, and if the weft is reached at the angle, weaving efficiency is high, fabric quality is good, and the like. Generally, the earlier the air pressure used is larger or the earlier the auxiliary injection solenoid valve is opened, the longer the opening duration is, which can be set empirically. The sampling range Θ' ∈ (x1, y 1); the range is less than or equal to the weft-detecting confirmation angle, namely x1 is less than or equal to x, y1 is less than or equal to y, a general set value is vertically spaced by a certain angle by taking the target arrival angle as the center, and the influence of early or late arrival of weft yarns on sampling statistics under some special conditions can be filtered. Sampling period T: one calculation cycle is how many picks are sampled within the sampling range. The sampling average arrival angle Δ α is (α 1+ α 2+ … + α T)/T, where α 1, α 2, …, α T is the single arrival angle of the weft yarn detected by the weft detector 13, and the sampling average arrival angle Δ α is the average arrival angle of the weft yarn in one sampling period. And (3) actual use auxiliary spraying electromagnetic valve selection: namely, the auxiliary spraying electromagnetic valves can be selected to be automatically adjusted. The adjustment amplitude Δ t is (Δ α - α) × η, η ∈ (0, 100%), is a preset percentage, i.e., is compared with the set target arrival angle α, the opening and closing timings of the actually used auxiliary injection solenoid valves, i.e., the action solenoid valves, are calculated according to the preset percentage of the difference, when Δ t is a positive number, the action solenoid valves are opened in advance and closed in a delayed manner by an angle Δ t, i.e., (a- Δ t, a + Δ t), and when Δ t is a negative number, the action solenoid valves are opened in a delayed manner and closed in advance by an angle Δ t, i.e., (a + Δ t, a- Δ t). The adjustment range is provided with two modes of mean value mode and custom mode. In the mean mode, the preset percentage η is the same for all active solenoid valves.

3) Starting up and running for sampling, and judging whether weft stop exists in the first sampling period, if weft stop exists, returning to the step 1), and if weft stop does not exist, executing the next step.

The main control computer 11 automatically calculates the opening and closing time of each auxiliary spraying electromagnetic valve and transmits the opening and closing time to the electromagnetic valve control device 10, the weft detector 7 detects weft arrival angle signals in the running process of the weaving machine, the weft arrival angle signals are screened and counted by the main control computer 11 and an average value is calculated, the average value is compared with a preset target arrival angle, the adjustment range of the auxiliary spraying electromagnetic valve which is actually used is calculated, the opening and closing time of the auxiliary spraying electromagnetic valve which is actually used is adjusted and controlled, and therefore the actual weft arrival angle approaches to the target weft arrival angle.

And calculating the adjustment amplitude of the actually used auxiliary spraying electromagnetic valve according to the preset percentage of the difference value.

The auxiliary spraying electromagnetic valves in the step 3) can select which electromagnetic valves are used for automatic adjustment according to needs, preset percentage eta is independently set for each action electromagnetic valve in a user-defined mode, the opening and closing time of the first group and the last group has large influence on weft insertion, the automatic adjustment function can not be used or the eta value is set to be small, and the automatic adjustment function is used in the middle part or the eta value is set to be large, so that the adaptability to the variety of the fabric is expanded.

4) Calculating an average weft arrival angle delta alpha according to set parameters, comparing the average arrival angle delta alpha with a target arrival angle, continuing sampling if the average arrival angle delta alpha is the same, and opening before delay and closing if the average arrival angle delta alpha is larger than the target arrival angle, and adjusting delta t; and if the average value of the arrival angle delta alpha is smaller than the target arrival angle, if the average value of the arrival angle delta alpha is larger than the target arrival angle, opening before and closing in a delayed mode.

Fig. 4 is an operation setting page for automatic angle adjustment of the auxiliary injection solenoid valve. The weft feeler confirmation angle Θ e (x, y) is the interval angle of the detected weft yarn at which the weft feeler 13 is open. In the figure, "auxiliary spray electromagnetic valve automatic adjustment: ON/OFF' refers to the use or non-use of the auto-adjustment function. Target angle of arrival α: the preset desired weft arrival angle can be set empirically, typically, the earlier the greater the air pressure used or the earlier the auxiliary jet solenoid valve is opened, the longer the duration of opening. The sampling range Θ' ∈ (x1, y 1); the range is less than or equal to the weft-detecting confirmation angle, namely x1 is less than or equal to x, y1 is less than or equal to y, a general set value is vertically spaced by a certain angle by taking the target arrival angle as the center, and the influence of early or late arrival of weft yarns on sampling statistics under some special conditions can be filtered. Sampling period T: one calculation cycle is how many picks are sampled within the sampling range. The sampling average arrival angle Δ α is (α 1+ α 2+ … + α T)/T, where α 1, α 2, …, α T is the single arrival angle of the weft yarn detected by the weft detector 13, and the sampling average arrival angle Δ α is the average arrival angle of the weft yarn in one sampling period. Selecting an action electromagnetic valve: namely, the auxiliary spraying electromagnetic valves can be selected to be automatically adjusted. The adjustment amplitude Δ t is (Δ α - α) × η, η ∈ (0, 100%), is a preset percentage, i.e., is compared with the set target arrival angle α, the opening and closing timings of the actually used auxiliary injection solenoid valves, i.e., the action solenoid valves, are calculated according to the preset percentage of the difference, when Δ t is a positive number, the action solenoid valves are opened in advance and closed in a delayed manner by an angle Δ t, i.e., (a- Δ t, a + Δ t), and when Δ t is a negative number, the action solenoid valves are opened in a delayed manner and closed in advance by an angle Δ t, i.e., (a + Δ t, a- Δ t). The adjustment range is provided with two modes of mean value mode and custom mode. In the mean mode, the preset percentage η is the same for all active solenoid valves.

FIG. 5 is an expanded page of the custom mode of FIG. 4, in which the η value for each active solenoid valve can be set individually. In the user-defined mode, each 'acting electromagnetic valve' can independently set preset percentage eta, the first groups and the last groups have larger influence on weft insertion at the opening and closing time, the eta value can be set to be smaller, and the eta value is set to be larger in the middle part. This is done to expand the adaptability to the variety of fabrics. Wherein the number n of the used electromagnetic valves in the step 1) refers to the number of all auxiliary spraying electromagnetic valves on the actual weaving machine; the 'actually used auxiliary spraying electromagnetic valves' in the step 3), namely 'acting electromagnetic valves' can select which electromagnetic valves use the automatic adjustment function, each 'acting electromagnetic valve' can independently set the preset percentage eta in a user-defined mode, for example, the first groups and the last groups of opening and closing time have larger influence on weft insertion, the automatic adjustment function can not be used or the eta value can be set to be smaller, the middle part uses the automatic adjustment function or the eta value is set to be larger, and the adaptability to the fabric variety can be expanded by adopting the random selection.

FIG. 6 is a real-time monitoring bar display and weft arrival real-time monitoring page with the solenoid valve open and closed. The horizontal bar display can clearly see the opening and closing interval of each electromagnetic valve in real time, and the real-time monitoring page can display the statistical average arrival angle.

5) The next use is made.

The utility model can stably adjust the opening and closing time of the action electromagnetic valve by calculating the opening and closing time of the action electromagnetic valve according to the preset percentage of the difference value, can not generate overshoot and can lead the action and the opening and closing angle of the electromagnetic valve to approach the rational state, thereby saving the compressed air; the preset percentage can be set according to the actual manufacturing condition, so that the adjustment is faster or slower; the selection of the action electromagnetic valves can enable the electromagnetic valves with different action sizes to be flexibly set for weft insertion, for example, the front two groups of electromagnetic valves and the rear two groups of electromagnetic valves are not adjusted.

The foregoing is merely illustrative of some of the principles of the present invention and the description is not intended to limit the invention to the specific constructions and applications shown, so that all modifications and equivalents that may be utilized are within the scope of the invention.

Other technical features than those described in the specification are known to those skilled in the art.

Claims

1. A weft insertion device of an air jet loom comprises a yarn blocking needle, an auxiliary main nozzle, a swing main nozzle, a weft detection detector, a main air bag, an auxiliary air bag, an electromagnetic valve control device, a main control computer, a display input device, an encoder, an auxiliary nozzle, an auxiliary jet electromagnetic valve and an auxiliary nozzle group consisting of a plurality of auxiliary nozzles, and is characterized in that the main control computer is respectively and electrically connected with an electromagnetic valve control device, the display input device, the encoder and the weft detection detector, the electromagnetic valve control device is respectively and electrically connected with the yarn blocking needle, an electromagnetic valve I, an electromagnetic valve II and an auxiliary jet electromagnetic valve, the auxiliary main nozzle is connected with the main air bag through the electromagnetic valve I, the swing main nozzle is connected with the main air bag through the electromagnetic valve II, and the auxiliary nozzle is respectively connected with the auxiliary air bag through a corresponding;