Automatic unwinding weft accumulator with adjustable weft tension and control method

Abstract

The invention provides an automatic unwinding weft storage device with adjustable weft tension and a control method, the automatic unwinding weft storage device comprises a rotary yarn feeding unit and a control unit, the rotary yarn feeding unit is characterized in that a servo motor is connected with an air expansion shaft, a spool is aerated and fixed through the air expansion shaft, a thickness sensor is added to the side edge of the spool, and the yarn feeding amount is fed back to the servo motor in a signal mode by calculating the diameter change of the spool; the motor driving unit and the motor coding unit respectively send a driving signal and a coding number to the motor system to control the number of turns and the speed of the motor; yarn penetrates into a swing rod through an S shape, the tail end of the swing rod is connected with a cam, and a distance measuring sensor is installed at the bottom of the cam and used for sensing the swing amplitude of the swing rod and converting the angle of the swing rod into a digital quantity signal to be used for adjusting the action proportional relation of a yarn releasing motor and a yarn feeding motor and adjusting the yarn feeding and releasing action balance relation. And the central controller sends a command to control the motor driving unit to execute balanced yarn feeding control operation. The constant-tension yarn weaving device is simple in structure and capable of stably controlling the motor to achieve constant-tension yarn weaving.

Description

Technical Field

[0001] The present application relates to the technical field of textile weft tension-adjustable unwinding, and in particular to an automatic unwinding weft storage device with adjustable weft tension and a control method thereof. Background Art

[0002] With the continuous progress of the textile industry, various woven three-dimensional fabrics have higher and higher requirements for weft tension control. The weft tension control of traditional unwinding and weft storage devices has problems such as unstable yarn delivery, yarn adhesion and jamming, and no missing or broken weft alarm function, which can no longer meet the requirements of high-quality weaving.

[0003] However, there is currently no mature solution for unstable yarn delivery, yarn sticking and jamming, and missing and broken weft alarms, which makes it difficult for current fabric quality to meet requirements. Summary of the invention

[0004] The present application provides an automatic unwinding weft storage device with adjustable weft tension and a control method, which can be used to solve the technical problems of unstable yarn delivery and no alarm for weft shortage or leakage.

[0005] The present application provides an automatic unwinding weft storage device with adjustable weft tension, the automatic unwinding weft storage device comprising a rotary yarn feeding unit, a swing rod adjustment unit, a U-shaped pressure rod yarn storage unit and a central control unit;

[0006] The U-shaped pressure rod yarn storage unit is arranged in the middle position, and the rotary yarn feeding unit and the swing rod adjustment unit are arranged on one side of the U-shaped pressure rod yarn storage unit;

[0007] The rotary yarn feeding unit comprises an air expansion shaft 2; the air expansion shaft 2 is provided with a servo motor; the air expansion shaft 2 is used for feeding yarn and for adjusting the amount of weft yarn during the weaving process;

[0008] The swing rod adjustment unit includes a yarn passing swing rod 3, a swing rod connecting rod 4, a cam 5, a sensor motor driving unit, a motor encoding unit and a motor system; wherein the yarn passing swing rod 3 drives the cam 5 to rotate, and the rotation amount is converted into a digital amount through the distance change between the cam 5 and the sensor 6, and the digital amount is transmitted to the central control unit;

[0009] The U-shaped pressure rod yarn storage unit comprises a pneumatic slide rod and a U-shaped groove, the slide rod can slide up and down in the groove, and a component is installed at the end of the slide rod;

[0010] The central control unit sends the thickness information obtained by the laser distance measuring device, the angle information of the cam 5 driven by the rocker 3, and the position information of the yarn reaching the U-shaped groove to the central controller, and the central controller issues a command to control the specified motor drive unit, and maintains the dynamic balance of the yarn release by adjusting the proportional control of the motor and the pneumatic slide rod to ensure the stable output of the yarn delivery.

[0011] Furthermore, the thickness signal is determined by a thickness measuring sensor, and the air-expansion shaft 2 in a yarn-free state is used as the zero point for calibration D0, and the yarn tube is placed on the tube for distance detection. The detected distance is Dm, and the radius of the air-expansion shaft 2 is R. Through the formula D=2π*(Dm-D0+R), there are concave and convex points on the original yarn, and the correction ratio is added to obtain D=2KPπ*(Dm-D0+R) to obtain the rotary yarn release amount, and the rotary yarn release amount is transmitted to the yarn release servo motor through the central controller.

[0012] Furthermore, the angle information of the cam 5 driven by the swing rod 3 is obtained by the swing rod 3 driving the cam 5, and the cam 5 adopts an experimental simulation curve, and the value read by the sensor 6 at the bottom of the cam 5 fits well, thereby avoiding the swing rod 3 from jumping.

[0013] Furthermore, the position information of the yarn arriving at the U-shaped groove is determined by the magnetic switch of the slide bar. The slide bar carries the magnetic switch sensor where the yarn arrives. The servo motor 7 of the clamping wheel 8 adjusts the yarn feeding speed through different positions to ensure the continuity of the yarn feeding.

[0014] Furthermore, the working mode of the automatic unwinding weft storage device includes an inching mode and a working mode.

[0015] Further, the U-shaped pressure bar yarn storage unit includes a pneumatic slide bar and a U-shaped groove, the slide bar can slide up and down in the groove, the slide bar material is stainless steel and the end is magnetic, and magnetic sensors 6 are installed on both sides of the U-shaped groove. When the slide bar slides up and down, the sensor 6 detects the position of the slide bar;

[0016] The sensor 6 includes 6 pieces, of which 5 magnetic sensors are evenly distributed on both sides of the U-shaped groove, with a spacing of LJ. Different unwinding speed ratios are set at five positions, the top position and the bottom position are limit positions, and the spacing speeds between two adjacent positions from top to bottom are V1, V2, V3, and V4 respectively;

[0017] The sixth sensor is installed so that it can move up and down; according to the matching ratio of the loom speed Vz and the unwinding speed VF, combined with the signal transmission delay time TY and the required yarn output length LZ, the position Lc of sensor 6 is determined according to LJ=[(LZ / Vz+TY)+(LJ / V1+LJ / V2+LJ / V3)]*VF. When the yarn output length is less than the set length, missing weft and missed weft are prompted.

[0018] Furthermore, the automatic unwinding weft storage device also includes a tension adjustment unit, which includes a tension rotating wheel 12 driven by a small motor and a metal paddle 13. The rotating wheel 12 squeezes the metal paddle 13 relative to each other, and the purpose of controlling the tension is achieved by controlling the angle of the motor. The yarn output tension is calibrated by calibrating the yarn output force through a tensile meter.

[0019] Furthermore, the automatic unwinding weft storage device also includes a guide wheel, and the guide wheel is used to change the direction of the yarn.

[0020] The present application also provides a control method for an automatic unwinding weft accumulator with adjustable weft tension, the method being used to control the automatic unwinding weft accumulator, the method comprising:

[0021] S1: Turn on the power, read the setting value before shutdown, and restore to the state before the last shutdown;

[0022] S2: After the yarn passes through the swing rod 3, the pressure wheel 8, the U-shaped groove, the slide bar, the first guide wheel 10, the second guide wheel 11, and the metal pick 12 from the yarn storage drum 1, the yarn is placed at the bottom of the U-shaped groove through the inching mode. When the yarn reaches the position of the bottom magnetic switch sensor 6, the servo motor 7 of the pressure wheel 8 stops;

[0023] S3: Set the loom weft insertion speed, follow-up ratio, compensation ratio, and action delay time;

[0024] S4: Wait for the loom equipment to start weft insertion, and start and stop synchronously with the loom equipment;

[0025] S5: If the chuck is loose and the fabric is missing weft, the weft feeder determines the amount of yarn used by the position reached by the magnetic switch sensor 6. If it is missing weft, the weft feeder will sound an alarm, and the weft feeder and the loom will stop.

[0026] The present invention is an automatic unwinding weft storage device with adjustable weft yarn tension during the weaving process of fabric. A central controller calculates a given signal to drive a motor to complete automatic unwinding of the weft thread. The weft yarn tension can also be adjusted according to requirements. The device can operate stably and effectively for a long time in a weaving environment, detect weft yarn shortage and weft leakage, and give an alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An automatic unwinding and weft storage device with adjustable weft tension provided in an embodiment of the present application

[0028] Figure 2 A schematic diagram of a swing rod provided in an embodiment of the present application.

[0029] Figure 1 1 is the yarn storage drum, 2 is the air expansion shaft with the servo motor, 3 is the swing rod with a cam on the rotating part, 4 is the swing rod connecting rod, 5 is the swing rod cam, 6 is the detection sensor 6, 7 is the servo motor of the clamping wheel, 8 is the clamping wheel, 9 is the pneumatic sliding platform with a slide rod installed, 10 is the first guide wheel, 11 is the second guide wheel, 12 is the rotating wheel, 13 is the metal pick DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0031] The following first introduces the embodiments of the present application in conjunction with the accompanying drawings.

[0032] The cooperation of the rotary yarn feeding unit and the rocker rod 3 adjustment unit of the present invention solves the problems of unstable weft unwinding and yarn adhesion and jamming. The U-shaped pressure rod yarn storage unit calculates the yarn length through the controller to determine whether the weft yarn is missing or not. The tension adjustment unit adjusts the tension by rotating the angle of the metal pick 13, and the metal pick 13 rubs against the yarn, which can significantly improve the quality of the fabric.

[0033] It includes a rotary yarn feeding unit, a swing rod adjustment unit, a U-shaped pressure rod yarn storage unit and a central control unit;

[0034] The U-shaped pressure rod yarn storage unit is arranged in the middle position, and the rotary yarn feeding unit and the swing rod adjustment unit are arranged on one side of the U-shaped pressure rod yarn storage unit;

[0035] The rotary yarn feeding unit includes an air expansion shaft 2; the air expansion shaft 2 is provided with a servo motor; the air expansion shaft 2 is used for feeding yarn and for adjusting the amount of weft yarn during the weaving process;

[0036] The swing rod adjustment unit includes a yarn passing swing rod 3, a swing rod connecting rod 4, a cam 5, a sensor motor driving unit, a motor encoding unit and a motor system; wherein the yarn passing swing rod 3 drives the cam 5 to rotate, and the rotation amount is converted into a digital amount through the distance change amount between the cam 5 and the sensor 6, and the digital amount is transmitted to the central control unit;

[0037] The U-shaped pressure bar yarn storage unit comprises a pneumatic slide rod and a U-shaped groove, the slide rod can slide up and down in the groove, and a component is installed at the end of the slide rod;

[0038] The central control unit sends the thickness information obtained by the laser distance measuring device, the angle information of the cam 5 driven by the rocker 3, and the position information of the yarn reaching the U-shaped groove to the central controller, and the central controller issues a command to control the specified motor drive unit, and maintains the dynamic balance of the yarn release by adjusting the proportional control of the motor and the pneumatic slide rod to ensure the stable output of the yarn delivery.

[0039] The thickness signal is determined by the thickness sensor, and the air expansion shaft 2 in the yarn-free state is used as the zero point for calibration D0. The yarn tube is placed on the tube for distance detection. The detected distance is Dm, and the radius of the air expansion shaft 2 is R. According to the formula D=2π*(Dm-D0+R), there are concave and convex points on the original yarn. By adding the correction ratio, D=2KPπ*(Dm-D0+R) is obtained to obtain the rotary yarn release amount, and the rotary yarn release amount is transmitted to the yarn release servo motor through the central controller.

[0040] The angle information of the cam 5 driven by the swing rod 3 is driven by the swing rod 3. The cam 5 adopts an experimental simulation curve, and the value read by the sensor 6 at the bottom of the cam 5 fits well, so as to avoid the swing rod 3 from jumping.

[0041] The position information of the yarn arriving at the U-shaped groove is determined by the magnetic switch of the slide bar. The slide bar carries the magnetic switch sensor where the yarn arrives. The servo motor 7 of the pressure wheel 8 adjusts the yarn feeding speed through different positions to ensure the continuity of the yarn feeding.

[0042] The working modes include inching mode and working mode.

[0043] The U-shaped pressure bar yarn storage unit includes a pneumatic slide bar and a U-shaped groove. The slide bar can slide up and down in the groove. The slide bar is made of stainless steel and has a magnetic end. Magnetic sensors are installed on both sides of the U-shaped groove to detect the position of the slide bar when the slide bar slides up and down and passes through the sensor.

[0044] There are 6 magnetic sensors in total, 5 of which are evenly distributed on both sides of the U-shaped slot, with a spacing of LJ. Different unwinding speed ratios are set at five positions. The top and bottom positions are limit positions, and the spacing speeds between two adjacent positions from top to bottom are V1, V2, V3, and V4 respectively;

[0045] The sixth sensor is installed so that it can move up and down; according to the matching ratio of the loom speed Vz and the unwinding speed VF, combined with the signal transmission delay time TY and the required yarn output length LZ, the position Lc of sensor 6 is determined according to LJ=[(LZ / Vz+TY)+(LJ / V1+LJ / V2+LJ / V3)]*VF. When the yarn output length is less than the set length, missing weft and missed weft are prompted.

[0046] The present application also includes a tension adjustment unit, which includes a tension rotating wheel 12 driven by a small motor and a metal paddle 13. The rotating wheel 12 squeezes the metal paddle 13 relative to each other, and the purpose of controlling the tension is achieved by controlling the angle of the motor. The yarn output tension is calibrated by calibrating the yarn output force through a tensile meter.

[0047] An electrical control method comprises the following steps:

[0048] S1: Turn on the power, read the setting value before shutdown, and restore to the state before the last shutdown;

[0049] S2: After the yarn passes through the swing rod 3, the pressure wheel 8, the U-shaped groove, the slide bar, the first guide wheel 10, the second guide wheel 11, and the metal pick 12 from the yarn storage drum 1, the yarn is placed at the bottom of the U-shaped groove through the inching mode. When the yarn reaches the position of the bottom magnetic switch sensor 5, the servo motor 7 of the pressure wheel 8 stops;

[0050] S3: Set the loom weft insertion speed, follow-up ratio, compensation ratio, and action delay time;

[0051] S4: Wait for the loom equipment to start weft insertion, and start and stop synchronously with the loom equipment;

[0052] S5: If the chuck is loose and the fabric is missing or leaking, the weft storage device determines the amount of yarn used by the position reached by the magnetic switch sensor 6, and determines that it is missing or leaking. The weft storage device sends an alarm, and the weft storage device and the loom stop.

[0053] Each unit works together to achieve adjustable weft tension and automatic unwinding and weft storage functions, improving the stability and efficiency of the weaving process.

[0054] like Figure 1 As shown, the present application includes a rotary yarn feeding unit, a swing rod 3 adjustment unit, a U-shaped pressure rod yarn storage unit, and a tension adjustment unit. In the rotary yarn feeding unit, the yarn tube is inserted into the air expansion shaft 2 driven by the servo motor 7, and air is added to fix it. The yarn of the yarn tube is pulled out and enters the swing rod 3 adjustment unit, passes through the pressure wheel 8 and the pressure wheel servo motor from the middle of the swing rod 3, and then enters the U-shaped pressure rod yarn storage unit and bypasses the slide rod from the bottom, and is pulled from the bottom of the slide rod through the guide wheel, and finally the yarn passes through the metal pick 13 and enters the area to be inserted.

[0055] The swing adjustment device can effectively separate the adhering yarns while coupling the change of the yarn release speed, thus solving the problem of yarn jamming caused by adhering yarns.

[0056] The weft tension is adjustable by using a lightweight slide bar to precisely adjust the friction between the paddle 13 and the yarn through the force of the guide wheel and the motor, and the tension is calibrated and adjusted through a dynamometer to achieve a more accurate friction during use.

[0057] In the weaving process, after the required weft yarn length is set, the weft yarn does not reach the lead-out weft yarn length during the weaving process of the loom. Under the premise of a certain speed, it does not reach the magnetic switch position within a certain time. The equipment alarms for missing weft and missing weft, and the loom equipment is linked to shut down.

[0058] In the present application, the servo motor of the rotating yarn feeding unit is connected to the air shaft, and the yarn tube is fixed by the air shaft. A thickness sensor is added to the side of the yarn tube. By calculating the change in the diameter of the yarn tube, the yarn feeding amount is fed back to the servo motor in the form of a signal; the motor drive unit and the motor encoding unit send a drive signal and a code number to the motor system respectively to control the number of turns and speed of the motor; the swing rod adjustment unit: the yarn passes through the swing rod through the S shape, the end of the swing rod is connected to the cam, and the distance sensor is installed at the bottom of the cam to sense the swing amplitude of the swing rod and convert the angle of the swing rod into a digital signal to adjust the proportional relationship between the yarn release motor and the yarn feeding motor, and adjust the balance relationship between the yarn feeding and releasing actions. The central controller sends a command to control the motor drive unit, and determines the current size of the adjustment motor by reading the tension value of the tension sensor and using the fuzzy adaptive algorithm to perform the balanced yarn feeding control operation. U-shaped slider yarn storage unit: the entire yarn storage unit is U-shaped, and there is a pneumatic lightweight track slider at the center of the groove, and a multi-level magnetic switch is set, which can balance the slider weight by air pressure. The present invention has a simple structure and can stably control the motor to achieve constant tension weaving of yarn.

[0059] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic unwinding and weft storage device with adjustable weft tension, characterized in that: The automatic unwinding weft storage device comprises a rotary yarn feeding unit, a swing rod adjustment unit, a U-shaped pressure rod yarn storage unit and a central control unit; The U-shaped pressure rod yarn storage unit is arranged in the middle position, and the rotary yarn feeding unit and the swing rod adjustment unit are arranged on one side of the U-shaped pressure rod yarn storage unit; The rotary yarn feeding unit comprises an air expansion shaft (2); the air expansion shaft (2) is provided with a servo motor; the air expansion shaft (2) is used for feeding yarn and for adjusting the amount of weft yarn during the weaving process; The swing rod adjustment unit comprises a yarn passing swing rod (3), a swing rod connecting rod (4), a cam (5), a sensor motor driving unit, a motor encoding unit and a motor system; The yarn passing swing rod (3) drives the cam (5) to rotate, and the rotation amount is converted into a digital quantity through the distance change between the cam (5) and the sensor (6), and the digital quantity is transmitted to the central control unit; The U-shaped pressure rod yarn storage unit comprises a pneumatic slide rod and a U-shaped groove, the slide rod can slide up and down in the groove, and a component is installed at the end of the slide rod; The central control unit sends thickness information obtained by the laser distance measuring device, angle information of the cam (5) driven by the swing rod (3), and position information of the yarn reaching the U-shaped groove to the central controller, and the central controller issues a command to control the designated motor drive unit, and maintains the dynamic balance of the yarn release by adjusting the proportional control of the motor and the pneumatic slide rod, thereby ensuring the stable output of the yarn delivery.

2. The automatic unwinding weft feeder according to claim 1, characterized in that: The thickness signal is determined by a thickness sensor, and the air shaft (2) in a yarn-free state is used as the zero point for calibration D0, and a yarn tube is placed on the tube for distance detection. The detected distance is Dm, and the radius of the air shaft (2) is R. D=2KPπ*(Dm-D0+R) is used to obtain the rotational yarn release amount, which is then transmitted to the yarn release servo motor through a central controller.

3. The automatic unwinding weft feeder according to claim 1, characterized in that: The angle information of the cam (5) driven by the swing rod (3) is obtained by the swing rod (3) driving the cam (5), the cam (5) adopts an experimental simulation curve, and the value read by the sensor (6) at the bottom of the cam (5) is consistent, so as to avoid the swing rod (3) from jumping.

4. The automatic unwinding weft feeder according to claim 1, characterized in that: The position information of the yarn arriving at the U-shaped groove is determined by the magnetic switch of the slide bar. The slide bar carries the magnetic switch sensor where the yarn arrives. The servo motor 7 of the clamping wheel (8) adjusts the yarn feeding speed through different positions to ensure the continuity of the yarn feeding.

5. The automatic unwinding weft feeder according to claim 1, characterized in that: The working modes of the automatic unwinding weft feeder include inching mode and working mode.

6. The automatic unwinding weft feeder according to claim 1, characterized in that: The U-shaped pressure bar yarn storage unit comprises a pneumatic sliding rod and a U-shaped groove. The sliding rod can slide up and down in the groove. The sliding rod is made of stainless steel and has a magnetic end. Magnetic sensors (6) are installed on both sides of the U-shaped groove. When the sliding rod slides up and down, the sensor (6) detects the position of the sliding rod. The sensors (6) include six sensors, five of which are evenly distributed on both sides of the U-shaped groove, with a spacing of LJ. Different unwinding speed ratios are set at five positions, the uppermost position and the lowermost position are limit positions, and the spacing speeds between two adjacent positions from top to bottom are V1, V2, V3, and V4 respectively; The sixth sensor is installed so that it can move up and down; according to the matching ratio of the loom speed Vz and the unwinding speed VF, combined with the signal transmission delay time TY and the required yarn output length LZ, the sensor position Lc is determined according to LJ=[(LZ / Vz+TY)+(LJ / V1+LJ / V2+LJ / V3)]*VF. When the yarn output length is less than the set length, missing weft and missed weft are prompted.

7. The automatic unwinding weft feeder according to claim 1, characterized in that: The automatic unwinding weft storage device also includes a tension adjustment unit, which includes a tension rotating wheel (12) driven by a small motor and a metal pick (13). The rotating wheel (12) relatively squeezes the metal pick (13), and the purpose of controlling the tension is achieved by controlling the angle of the motor. The yarn outlet tension is calibrated by calibrating the yarn outlet force through a tension meter.

8. The automatic unwinding weft feeder according to claim 1, characterized in that: The automatic unwinding weft storage device also includes a guide wheel, which is used to change the direction of the yarn.

9. A control method for an automatic unwinding weft accumulator with adjustable weft tension, the method being used to control any one of the automatic unwinding weft accumulators in claims 1 to 8, characterized in that: The method comprises: S1: Turn on the power, read the setting value before shutdown, and restore to the state before the last shutdown; S2: After the yarn passes through the swing rod, the pressure wheel, the U-shaped groove, the slide rod, the first guide wheel, the second guide wheel, and the metal pick from the yarn storage drum, the yarn is placed at the bottom of the U-shaped groove through the inching mode. When the yarn reaches the bottom magnetic switch sensor position, the servo motor of the pressure wheel stops; S3: Set the loom weft insertion speed, follow-up ratio, compensation ratio, and action delay time; S4: Wait for the loom equipment to start weft insertion, and start and stop synchronously with the loom equipment; S5: If the chuck is loose and the fabric is missing or leaking, the weft feeder determines the amount of yarn used by the position reached by the magnetic switch sensor. If it is missing or leaking, the weft feeder will sound an alarm and the weft feeder and loom will stop.

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