CN110040572B

CN110040572B - Static pressure control method of automatic winder and automatic winder

Info

Publication number: CN110040572B
Application number: CN201811551805.XA
Authority: CN
Inventors: 平野敬士
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2018-01-16
Filing date: 2018-12-18
Publication date: 2022-04-05
Anticipated expiration: 2038-12-18
Also published as: CN110040572A; JP2019123587A; EP3511274B1; EP3511274A1

Abstract

The invention relates to a static pressure control method of an automatic winder and the automatic winder, the static pressure control method of the automatic winder includes: a starting step of operating the suction blower so that the static pressure of the suction air flow is higher than a predetermined set value when the plurality of winding units are started; an initial feedback step of performing feedback control of the frequency of the suction blower in order to reduce the static pressure of the suction air flow to a set value after the start-up step; and a normal feedback step of performing feedback control of the frequency of the suction blower after the initial feedback step in order to maintain the static pressure of the suction air flow at a set value, wherein a control cycle of the initial feedback step is set to be shorter than a control cycle of the normal feedback step.

Description

Static pressure control method of automatic winder and automatic winder

Technical Field

The present invention relates to a static pressure control method for an automatic winder including a plurality of winding units capable of performing splicing by using a suction air flow.

Background

An automatic winder is known which includes a plurality of winding units that wind a yarn unwound from a yarn supplying bobbin around the bobbin to form a package. Each winding unit is provided with a yarn splicing device for splicing a yarn cut between a yarn supplying bobbin and a package. In the case of performing yarn splicing, the upper yarn and the lower yarn are respectively guided to the yarn splicing device by a suction member for the upper yarn that performs suction and holding of the yarn (upper yarn) on the package side and a suction member for the lower yarn that performs suction and holding of the yarn (lower yarn) on the yarn feeding bobbin side.

In such an automatic winder, a suction blower is provided to supply a suction air flow to the suction member of each winding unit. In the flow path connecting the suction blower and each winding unit, the retention of the yarn waste occurs with the passage of time, the fluidity of the suction air is deteriorated, and the pressure (static pressure) in the duct is gradually reduced. If the static pressure is low, the suction force of the suction member is reduced, and the joint cannot be performed.

In order to cope with this, it is conceivable to set the static pressure high from the beginning by predicting a decrease in the static pressure, but this increases the power consumption of the suction blower. Thus, for example, Japanese unexamined patent publication No. 2-40759 discloses a method in which: the static pressure of the suction air flow is detected, and the operation of the suction blower is feedback-controlled based on the detected value, thereby maintaining the static pressure constant while suppressing an increase in power consumption.

However, if the feedback control is performed only on the operation of the suction blower, the following problem occurs. For example, when the automatic winder is started, it takes a long time to adjust the static pressure of the suction air flow to a set value, and power consumption at the initial start-up is increased. Even after the automatic winder is in a normal operation state, the static pressure of the suction air flow may fluctuate (vibrate) and become higher than a set value, which may cause an increase in power consumption.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object of the present invention is to reduce power consumption of a suction blower by appropriately controlling a static pressure of a suction air flow in an automatic winder including a plurality of winding units capable of performing splicing by the suction air flow.

A first aspect of a static pressure control method for an automatic winder according to the present invention is a static pressure control method for an automatic winder including a plurality of winding units capable of performing splicing by using a suction air flow, a suction blower generating the suction air flow, and a static pressure detection unit detecting a static pressure of the suction air flow, the method including: a starting step of operating the suction blower so that a static pressure of the suction air flow becomes higher than a predetermined set value when the plurality of winding units are started; an initial feedback step of performing feedback control of the frequency of the suction blower in order to reduce the static pressure of the suction air flow to the set value after the start-up step; and a normal feedback step of performing feedback control of the frequency of the suction blower after the initial feedback step in order to maintain the static pressure of the suction air flow at the set value, wherein a control cycle of the initial feedback step is set to be shorter than a control cycle of the normal feedback step.

When the automatic winder is started, the automatic winder is started in order from the winding unit disposed at the end among the plurality of winding units, and the winding unit starts winding after piecing. Therefore, if the static pressure of the suction air flow is insufficient at the time of starting the automatic winder, the joint may fail successively, and the winding may not be started. In this regard, according to the first aspect of the present invention, first, in the starting step, the suction blower is operated so that the static pressure of the suction air flow becomes higher than the set value, and therefore the static pressure at the starting time can be increased, and the joint can be reliably performed. Further, since the control cycle of the initial feedback step immediately after the start-up step is set to be shorter than the normal feedback step thereafter, the static pressure set high in the start-up step can be quickly reduced to the set value and adjusted to the set value. Therefore, the state in which the static pressure is higher than the set value can be made to stay for a short time, and the power consumption of the suction blower can be reduced.

In the first aspect of the static pressure control method for an automatic winder according to the present invention, a detection cycle of the initial feedback step, which is detected by the static pressure detecting unit, may be set to be shorter than a detection cycle of the normal feedback step.

By setting the static pressure detection cycle in the initial feedback step short in this way, the static pressure can be adjusted to the set value more quickly.

In the first aspect of the static pressure control method of the automatic winder according to the present invention, the acceleration/deceleration rate of the frequency of the suction blower in the initial feedback step may be set to be higher than the acceleration/deceleration rate in the normal feedback step.

By setting the acceleration/deceleration rate of the frequency of the suction blower in the initial feedback step to be high in this way, the static pressure set to be high in the start-up step can be more quickly reduced to the set value.

In the first aspect of the static pressure control method for an automatic winder according to the present invention, in the start-up step, the frequency of the suction blower may be increased first, and when the instantaneous value of the static pressure detected by the static pressure detection unit becomes equal to or greater than a start-up setting value that is higher than the setting value, the frequency of the suction blower may be maintained at a time when the instantaneous value becomes equal to or greater than the start-up setting value.

By controlling the frequency of the suction blower in this way, the frequency does not need to be changed after the instantaneous value of the static pressure reaches the start-time set value, and the control program can be simplified.

In the first aspect of the static pressure control method for an automatic winder according to the present invention, the start-up process may be shifted to the initial feedback process when the start-up of the plurality of winding units is completed.

By shifting to the initial feedback step after the completion of the start-up of the plurality of winding units, the state in which the static pressure is high can be maintained while the plurality of winding units are sequentially started up. Therefore, the joint failure in the starting process can be effectively prevented, so that the winding can be started quickly.

In the first aspect of the static pressure control method for an automatic winder according to the present invention, in the initial feedback step, when the instantaneous value of the static pressure detected by the static pressure detecting unit becomes equal to or less than the set value, the frequency of the suction blower may be maintained at the frequency at the time when the instantaneous value becomes equal to or less than the set value for the remainder of the control cycle.

When the static pressure is lowered to the set value in the initial feedback process, if the decrease in the frequency of the suction blower is stopped and maintained constant at the time when the instantaneous value of the static pressure becomes equal to or less than the set value, the static pressure ratio set value can be suppressed from being lowered too low. Therefore, the static pressure can be adjusted to the set value more quickly.

In the first aspect of the static pressure control method for an automatic winder according to the present invention, in the initial feedback step, when the time average value of the static pressures detected by the static pressure detecting unit becomes equal to or less than the set value, the process may be shifted to the normal feedback step.

By making the determination when shifting from the initial feedback step to the normal feedback step using the time average value of the static pressure instead of the instantaneous value of the static pressure, it is possible to shift to the normal feedback step after the static pressure is adjusted to the set value more reliably in the initial feedback step.

A second aspect of the static pressure control method for an automatic winder according to the present invention is a static pressure control method for an automatic winder including a plurality of winding units capable of splicing by a suction air flow, a suction blower generating the suction air flow, and a static pressure detection unit detecting a static pressure of the suction air flow, wherein in order to maintain the static pressure of the suction air flow at a predetermined set value, feedback control is performed on a frequency of the suction blower, when a time average value of the static pressure detected by the static pressure detection unit is smaller than the set value, an increase in the frequency of the suction blower is started, and when an instantaneous value of the static pressure detected by the static pressure detection unit becomes equal to or greater than the set value, the increase in the frequency of the suction blower is stopped.

According to the second aspect of the present invention, since the determination when the frequency of stopping the suction blower is increased is made using the instantaneous value of the static pressure rather than the time average value of the static pressure, it is possible to effectively suppress the static pressure from increasing beyond the set value, and to reduce the power consumption of the suction blower.

An automatic winder according to the present invention includes: a plurality of winding units capable of performing splicing by using a suction air flow; a suction blower for generating the suction air flow; a static pressure detection unit that detects a static pressure of the suction airflow; and a control unit that controls an operation of the suction blower based on the static pressure detected by the static pressure detection unit, wherein the control unit is capable of executing any one of the static pressure control methods of the automatic winder.

In the automatic winder including such a control unit, power consumption of the suction blower can be reduced.

Drawings

Fig. 1 is a front view of an automatic winder according to the present embodiment.

Fig. 2 is a block diagram showing an electrical configuration of the automatic winder.

Fig. 3 is a front view of the winding unit.

Fig. 4 is a plan view schematically showing a waste recovering apparatus.

Fig. 5 is a flowchart showing a series of operations after the automatic winder is started.

Fig. 6 is a flowchart showing the initial feedback control.

Fig. 7 is a flowchart showing a normal feedback control.

Fig. 8 is a graph showing changes in blower frequency and static pressure.

Detailed Description

An embodiment of the present invention will be explained (automatic winder). Fig. 1 is a front view of an automatic winder according to the present embodiment, fig. 2 is a block diagram showing an electrical configuration of the automatic winder, and fig. 3 is a front view of a winding unit. As shown in fig. 1, the automatic winder 1 includes: a plurality of winding units 2 arranged in a predetermined arrangement direction (the left-right direction in fig. 1); a doffing device 3 provided so as to freely travel in the left-right direction; a yarn waste collection box 4 disposed on the left side of the plurality of winding units 2; and a machine control device 5 for controlling each part.

As shown in fig. 2, the machine control device 5, the unit control section 2a of each winding unit 2, and the doffing device 3 are configured to be able to transmit and receive electric signals to and from each other. When the formation of the package P, that is, the winding of the yarn Y is completed in a certain winding unit 2, a winding completion signal is transmitted from the unit control section 2a of the winding unit 2 to the doffer 3. The doffing device 3 that has received the winding completion signal moves to the winding unit 2 and doffs yarn.

(winding unit) as shown in fig. 3, the winding unit 2 winds the yarn Y unwound from the yarn supplying bobbin B around the winding tube Q to form a package P. The winding unit 2 has: a yarn supplying section 10 that supplies a yarn Y wound on a yarn supplying bobbin B while unwinding the yarn; and a yarn processing section 20 for performing various processes on the yarn Y supplied from the yarn supplying section 10; and a winding unit 30 that winds the yarn Y having passed through the yarn processing unit 20 around the winding tube Q to form a package P. The yarn supplying section 10, the yarn processing section 20, and the winding section 30 are arranged in this order from the bottom to the top.

The yarn supplying portion 10 includes a yarn unwinding assisting device 11, and the yarn unwinding assisting device 11 assists unwinding of the yarn Y when unwinding the yarn Y from the yarn supplying bobbin B held in an erected state. The yarn unwinding assisting device 11 has a restraining drum 12, and the restraining drum 12 is used to restrain the bulk (balloon) of the yarn Y when being unwound within an appropriate range.

The yarn processing section 20 includes a yarn detector 21, a tension applying device 22, a yarn splicing device 23, a yarn clearer 24, a lower yarn catching guide 25, an upper yarn catching guide 26, and the like.

The yarn detector 21 detects the presence or absence of the running yarn Y between the yarn unwinding assisting device 11 and the tension applying device 22. The tension applying device 22 applies a predetermined tension to the running yarn Y. In fig. 3, a so-called gate type is illustrated as an example. The yarn clearer 24 constantly acquires thickness information of the traveling yarn Y, and detects an abnormal portion, which is included in the yarn Y and has a yarn thickness greater than a certain level, as a yarn defect based on the yarn thickness information. The yarn clearer 24 is provided with a cutter 24a, and when a yarn defect is detected by the yarn clearer 24, the cutter 24a immediately cuts the yarn Y.

The yarn splicing device 23 splices the lower yarn Y1 on the yarn supplying bobbin B side and the upper yarn Y2 on the package P side when the yarn is cut by the cutter 24a, when the yarn is cut during winding of the package P, or when the yarn supplying bobbin B is replaced when the yarn clearer 24 detects a yarn defect. As an example of the yarn splicing device 23, there is an air splicer that splices yarns of the lower yarn Y1 and the upper yarn Y2 by generating an air flow and winding the fibers together. Further, although the yarn Y is cut by the cutter 24a after the yarn clearer 24 detects the yarn defect, the yarn defect remains on the upper yarn Y2. Therefore, the yarn splicing device 23 splices the lower yarn Y1 and the upper yarn Y2 after removing a yarn defect using a built-in cutter (not shown).

The lower yarn catching guide member 25 sucks and catches the lower yarn Y1 on the yarn supplying bobbin B side and guides the same to the yarn splicing device 23. The lower yarn catching guide member 25 is rotated by a motor 27, and is rotated up and down around a shaft 25 a. The suction portion 25b is provided at the distal end portion of the lower yarn catching guide member 25, and the suction portion 25b sucks and catches the yarn head portion of the lower yarn Y1. On the other hand, the upper yarn catching guide member 26 sucks and catches the upper yarn Y2 on the package P side and guides the same to the yarn splicing device 23. The upper yarn catching guide member 26 is rotated by a motor 28, and rotates up and down around a shaft 26 a. The suction portion 26b is provided at the distal end portion of the upper yarn catching guide member 26, and the suction portion 26b sucks and catches the yarn head portion of the upper yarn Y2. The lower yarn catching guide member 25 and the upper yarn catching guide member 26 are connected to a yarn waste collecting device 6 (see fig. 4) described later, and thereby suction airflows are generated in the

suction portions

25b and 26 b.

The splicing operation of the winding unit 2 is performed as follows. The upper yarn catching guide member 26 first rotates upward, and the suction portion 26b sucks and catches the yarn head portion of the upper yarn Y2 attached to the front surface of the package P. Subsequently, the upper yarn catching guide member 26 rotates downward while catching the upper yarn Y2, thereby guiding the upper yarn Y2 to the yarn splicing device 23. The lower yarn catching guide member 25 rotates upward in a state where the yarn head portion of the lower yarn Y1 is caught by the suction portion 25b, thereby guiding the lower yarn Y1 to the yarn splicing device 23. Then, the yarn splicing device 23 connects the yarn end portion of the lower yarn Y1 introduced by the lower yarn catching guide member 25 and the yarn end portion of the upper yarn Y2 introduced by the upper yarn catching guide member 26 to form a single yarn Y.

The winding section 30 includes a cradle 31 for rotatably supporting the winding tube Q, a traverse roller 32, and a roller drive motor 33 for rotating the traverse roller 32. A spiral traverse groove 32a is formed in the circumferential surface of the traverse drum 32, and the yarn Y is traversed by the traverse groove 32 a. By rotating the traverse drum 32 in contact with the package P, the yarn Y can be wound around the package P while traversing.

(yarn waste recovering apparatus) FIG. 4 is a plan view schematically showing the yarn waste recovering apparatus 6. The yarn waste recovery device 6 recovers the yarn waste generated in the plurality of winding units 2. The cut waste collection device 6 includes a cut waste collection box 4, a suction blower 41 and a filter 42 disposed in the cut waste collection box 4, and a duct 43 connecting the cut waste collection box 4 to the plurality of winding units 2. The duct 43 is disposed behind the plurality of winding units 2. The duct 43 is provided with a static pressure sensor 46 for detecting the static pressure of the suction air flow in the duct 43. In the present embodiment, the static pressure sensor 46 is provided at the upstream end of the duct 43 in the flow direction of the suction airflow. However, the static pressure sensor 46 may be provided at another position of the duct 43, or may be provided at a position closer to the duct 43 than the filter 42 in the internal space of the cut-tobacco collection box 4.

The upper yarn catching guide 26 of the winding unit 2 is connected to the duct 43 via a pipe 51. The piping 51 is provided with a shutter 52 whose operation is controlled by the unit control unit 2 a. By opening and closing the shutter 52, it is possible to switch between a state in which the suction air flow is applied to the upper yarn catching guide member 26 and a state in which the suction air flow is not applied. When the yarn splicing operation is performed, the yarn Y can be sucked by the upper yarn catching guide 26 by opening the shutter 52. The lower yarn catching guide member 25 is connected to the duct 43 via a pipe 53. An opening/closing cover (not shown) is provided in the suction portion 25b (see fig. 3) of the lower yarn catching guide 25. The opening/closing cover is in contact with a pressing member, not shown, at a lower yarn catching position where the lower yarn catching guide member 25 catches the yarn head portion of the lower yarn Y1. This allows the opening/closing lid to be opened to exert a suction action.

In order to stabilize the joint operation of the winding unit 2, the static pressure (suction force) of the suction air flow in the duct 43 is preferably maintained at a predetermined set value P1. However, if the yarn waste is accumulated in the filter 42 and the duct 43, the static pressure in the duct 43 decreases, the suction force of the lower yarn catching guide member 25 and the upper yarn catching guide member 26 becomes weak, and the joint operation easily fails. Therefore, in the present embodiment, the frequency (rotation speed) of the suction blower 41 is feedback-controlled based on the detected value of the static pressure sensor 46 so that the static pressure in the duct 43 is maintained at the set value P1. Thus, even if the yarn waste remains in the filter 42 and the duct 43, the static pressure in the duct 43 can be maintained at the set value P1.

(static pressure control) the static pressure control of the suction air flow by the machine station control device 5 will be described in detail with reference to fig. 5 to 8. Fig. 5 is a flowchart showing a series of operations after the automatic winder 1 is started, fig. 6 is a flowchart showing initial feedback control, fig. 7 is a flowchart showing normal feedback control, and fig. 8 is a graph showing changes in the blower frequency and the static pressure. Note that, the vertical line of the chain line shown in the graph of fig. 8 indicates the start of the control period of the feedback control, and the interval of the chain line corresponds to the control period. Although the illustration is simplified in fig. 8, in practice, fine vibration (fluctuation) is usually generated in the instantaneous value of the static pressure (the detection value itself).

As shown in fig. 5, when the automatic winder 1 is started, the machine control device 5 first increases the frequency of the suction blower 41 (hereinafter referred to as "blower frequency") (step S11, refer to time t0 to time t1 of fig. 8). Then, when the instantaneous value (detection value itself) of the static pressure (force per unit area acting in the direction perpendicular to the flow direction, hereinafter referred to as "static pressure") of the suction airflow in the duct 43 becomes equal to or greater than the predetermined start-time setting value P2 (yes in step S12, refer to time t1 of fig. 8), the increase of the blower frequency is stopped. Then, the blower frequency after that is maintained at the frequency at which the instantaneous value reaches the start-time set value P2, and the plurality of winding units 2 are started (sequentially started) in order from the winding unit 2 at the end (step S13, refer to times t1 to t2 of fig. 8). Steps S11 to S13 correspond to the "startup process" of the present invention.

Here, the start-up setting value P2 is set to a value higher than the setting value P1 in the initial feedback step and the normal feedback step, which will be described later. The reason why the static pressure is set higher in advance in the starting process than in the normal operation is because the piecing operation is simultaneously performed in the plurality of winding units 2 when the plurality of winding units 2 are sequentially started. By setting the static pressure in the starting process to be high in advance, even if the splicing operation is simultaneously performed in the plurality of winding units 2, it is possible to prevent the suction force from becoming insufficient.

When the start-up of all the winding units 2 is completed (yes in step S14), that is, the winding of the yarn Y is started in all the winding units 2, the possibility that the yarn splicing operation is simultaneously performed in the plurality of winding units 2 becomes low. Therefore, the machine station control device 5 performs the initial feedback control so as to quickly decrease the static pressure set higher than the set value P1 to the set value P1 in the startup process (step S15). The initial feedback control is executed during time t2 to t4 in fig. 8, and corresponds to the "initial feedback process" of the present invention. After the static pressure is reduced to the set value P1 by the initial feedback control, the machine control device 5 performs the normal feedback control to maintain the static pressure at the set value P1 (step S16). The normal feedback control is executed after time t4 in fig. 8, and corresponds to the "normal feedback process" in the present invention. Hereinafter, the initial feedback control and the normal feedback control will be described in detail.

As shown in fig. 6, in the initial feedback control, first, it is determined whether or not a time average value (hereinafter, referred to as an "average value") of the static pressure in the previous control period is higher than a set value P1 (step S21). Since the average value of the static pressure becomes higher than the set value P1 immediately after the initial feedback starts (yes in step S21), the blower frequency is reduced at a constant deceleration rate (step S22). The instantaneous value of the static pressure is detected by static pressure sensor 46 at intervals shorter than the control period. As shown at times t2 to t3 in fig. 8, the instantaneous value of the static pressure also decreases in proportion to the decrease in the blower frequency. In step S23, it is determined whether or not the instantaneous value of the static pressure detected by the static pressure sensor 46 has dropped below the set value P1. If the instantaneous value is still higher than the set value P1 (no in step S23) and the control cycle has not elapsed (no in step S24), the blower frequency continues to be reduced (step S22). On the other hand, when the control cycle has elapsed (yes in step S24), the process returns to step S21 and the next control cycle is started based on the new average value.

When the instantaneous value of the static pressure becomes equal to or less than the set value P1 in step S23 (yes in step S23, refer to time t3 in fig. 8), the reduction of the blower frequency is stopped and maintained constant for the remainder of the control cycle (step S25). If the control cycle has elapsed (yes in step S26), the process returns to step S21 and the next control cycle is started based on the new average value. By determining the stop timing of the reduction of the blower frequency using the instantaneous value of the static pressure instead of the average value of the static pressure, it is possible to prevent the static pressure from exceeding the set value P1 and becoming too low, and to quickly adjust the static pressure to the set value P1.

When the average value of the static pressure becomes equal to or less than the set value P1 while steps S21 to S26 are repeated (no in step S21, refer to time t4 in fig. 8), the initial feedback control is ended, and the routine shifts to the normal feedback control. If it is assumed that the transition from the initial feedback process to the normal feedback process is determined using the instantaneous value of the static pressure, the transition to the normal feedback process is made at time t 3. In this case, the process proceeds to a normal feedback process in which the control period is long as described below in a state in which the average value of the static pressure is higher than the set value P1. In this case, since it may take a long time to adjust the static pressure to the set value P1, the transition determination is performed using the average value rather than the instantaneous value in the present embodiment.

Here, in the present embodiment, the control cycle of the initial feedback control is set to be shorter than the control cycle of the normal feedback control described below. The detection cycle of the static pressure sensor 46 for the initial feedback control to detect the static pressure is set to be shorter than the detection cycle of the normal feedback control. The acceleration/deceleration rate of the blower frequency in the initial feedback control is set to be higher than the acceleration/deceleration rate of the blower frequency in the normal feedback control. This enables the static pressure to be quickly adjusted to the set value P1 in the initial feedback process. In the present embodiment, the control cycle of the initial feedback control is set to 10 seconds, the detection cycle of the static pressure is set to 1 second, and the acceleration/deceleration rate of the blower frequency is set to 0.3 Hz/second. On the other hand, the control cycle of the normal feedback control was set to 300 seconds, the detection cycle of the static pressure was set to 15 seconds, and the acceleration/deceleration rate of the blower frequency was set to 0.001 Hz/second. Of course, these values are merely examples, and may be changed as appropriate.

As shown in fig. 7, in the normal feedback control, first, it is determined whether or not the average value of the static pressures in the previous control cycle is smaller than the set value P1 (step S31). If the average value of the static pressures is smaller than the set value P1 (yes in step S31, refer to time t5 in fig. 8), the blower frequency is increased at a constant acceleration rate (step S32). As shown at times t5 to t6 in fig. 8, the instantaneous value of the static pressure also increases in proportion to the increase in the blower frequency. However, since the acceleration/deceleration rate of the feedback control is generally slower than the acceleration/deceleration rate of the initial feedback control, the rising speed of the static pressure is slow.

In step S33, it is determined whether or not the instantaneous value of the static pressure detected by the static pressure sensor 46 reaches the set value P1. If the instantaneous value is still lower than the set value P1 (no in step S33) and the control cycle has not elapsed (no in step S34), the blower frequency continues to be increased (step S32). On the other hand, when the control cycle has elapsed (yes in step S34), the process returns to step S31 and the next control cycle is started based on the new average value.

When the instantaneous value of the static pressure reaches the set value P1 in step S33 (yes in step S33, refer to time t6 in fig. 8), the increase in the blower frequency is stopped for the remainder of the control cycle, and the blower frequency is maintained constant (step S35). If the control cycle has elapsed (yes in step S36), the process returns to step S31 and the next control cycle is started based on the new average value. By determining the timing of stopping the increase in the blower frequency using the instantaneous value of the static pressure instead of the average value of the static pressure, it is possible to prevent the static pressure from increasing beyond the set value P1, and thus to reduce wasteful power consumption.

On the other hand, in step S31, when the average value of the static pressures is equal to or greater than the set value P1 (no in step S31), the blower frequency is decreased at a constant deceleration rate during the control period (step S37). If the control cycle has elapsed (yes in step S38), the process returns to step S31 and the next control cycle is started based on the new average value.

In the present embodiment, the control cycle of the initial feedback step (initial feedback control) is set to be shorter than the control cycle of the normal feedback step (normal feedback control). Therefore, the static pressure that is set high in the starting process (when the plurality of winding units 2 are sequentially started) can be quickly reduced to the set value P1 and adjusted to the set value P1. Therefore, the state in which the static pressure is higher than the set value P1 can be made to stay for a short time, and the power consumption of the suction blower 41 can be reduced. In addition, conventionally, the process shifts to a normal feedback process in which the control period is long after the startup process, but this requires about 20 minutes to adjust the static pressure to the set value P1. On the other hand, when the operation is performed under the conditions of the present embodiment, the adjustment of the static pressure is completed in about 1 minute.

In the present embodiment, the detection cycle of the static pressure sensor 46 (corresponding to the "static pressure detection unit" of the present invention) in the initial feedback step is set to be shorter than the detection cycle in the normal feedback step. By setting the static pressure detection cycle in the initial feedback step short in this way, the static pressure can be adjusted to the set value P1 more quickly.

In the present embodiment, the acceleration/deceleration rate of the blower frequency in the initial feedback step is set to be faster than the acceleration/deceleration rate in the normal feedback step. By setting the acceleration/deceleration rate of the frequency of the suction blower in the initial feedback step to be high in this way, the static pressure set to be high in the start-up step can be reduced to the set value P1 more quickly.

In the present embodiment, in the starting process, the blower frequency is first increased (see time t0 to t1 in fig. 8), and when the instantaneous value of the static pressure detected by the static pressure sensor 46 becomes equal to or greater than the start-time set value P2 (see time t1 in fig. 8) which is set higher than the normal set value P1, the blower frequency at the time when the instantaneous value becomes equal to or greater than the start-time set value P2 is maintained thereafter (see time t1 to t2 in fig. 8). By controlling the blower frequency in this manner, it is not necessary to change the frequency after the instantaneous value of the static pressure reaches the start-time set value P2, and the control routine can be simplified.

In the present embodiment, when the start-up of the plurality of winding units 2 is completed in the start-up step (see time t2 in fig. 8), the process proceeds to the initial feedback step. This can maintain a state of high static pressure while the plurality of winding units 2 are sequentially started. Therefore, the joint failure in the starting process can be effectively prevented, so that the winding can be started quickly.

In the present embodiment, in the initial feedback step, when the instantaneous value of the static pressure detected by the static pressure sensor 46 becomes equal to or less than the set value P1 (see time t3 in fig. 8), the blower frequency is maintained at the frequency at the time when the instantaneous value becomes equal to or less than the set value P1 for the remainder of the control cycle. When the static pressure is lowered to the set value P1 in the initial feedback process, the static pressure can be suppressed from falling too low as compared with the set value P1 by stopping the reduction of the blower frequency and maintaining the blower frequency constant at the time when the instantaneous value of the static pressure becomes equal to or less than the set value P1. Therefore, the static pressure can be adjusted to the set value P1 more quickly.

In the present embodiment, in the initial feedback step, when the average value of the static pressures detected by the static pressure sensor 46 becomes equal to or less than the set value P1 (see time t4 in fig. 8), the process proceeds to the normal feedback step. By making the determination when shifting from the initial feedback process to the normal feedback process using the average value of the static pressures instead of the instantaneous value of the static pressures, it is possible to more reliably adjust the static pressures to the set value P1 in the initial feedback process and then shift to the normal feedback process.

In the present embodiment, when the average value of the static pressures detected by the static pressure sensors 46 is smaller than the set value P1 (see time t5 in fig. 8), the increase of the blower frequency is started, and when the instantaneous value of the static pressure detected by the static pressure sensors 46 becomes equal to or greater than the set value P1 (see time t6 in fig. 8), the increase of the blower frequency is stopped. In this way, since the determination when the blower stop frequency is increased is made using the instantaneous value of the static pressure rather than the average value of the static pressure, it is possible to effectively suppress the static pressure from increasing beyond the set value P1, and to reduce the power consumption of the suction blower 41.

(other embodiments) modifications of the above-described embodiments will be described with various modifications.

In the above embodiment, in the start-up process, the suction blower 41 is controlled so as to maintain the blower frequency at the time when the instantaneous value of the static pressure reaches the start-up setting value P2. However, the method of controlling the suction blower 41 in the startup process is not limited to this. For example, the blower frequency may be maintained at a constant value from the beginning in the start-up process. The constant value in this case is only required to be a frequency at which a static pressure that does not hinder the sequential activation of the plurality of winding units 2 can be achieved, and may be an upper limit value of the frequency of the suction blower 41 as an example.

In the above embodiment, when the start-up of all the winding units 2 is completed, the start-up process shifts to the initial feedback process. However, the start-up process may be shifted to the initial feedback process at a point in time when the start-up of a part of the winding unit 2 is not completed.

In the above embodiment, the acceleration rate and the deceleration rate in each feedback step are set to be the same. However, the acceleration rate may be different from the deceleration rate. In particular, as in the present embodiment, when emphasis is placed on reduction of the power consumption of the suction blower 41, the deceleration rate may be set to be faster than the acceleration rate.

In the above embodiment, the set value P1 of the static pressure is set to a single value. However, the set value P1 of the static pressure may be set to a value within a certain range.

In the above embodiment, the suction blower 41 is controlled by the machine control device 5. However, the suction blower 41 may be controlled by another control unit.

In the above embodiment, the machine station control device 5 automatically performs the transition from the startup step to the initial feedback step and the transition from the initial feedback step to the normal feedback step. However, the above-described transfer may be performed by an operation of an operator.

In the above embodiment, the unit control unit 2a of the winding unit 2 directly transmits the winding completion signal to the doffing device 3. However, a winding completion signal may be transmitted from the unit control unit 2a of the winding unit 2 to the machine control device 5, and the machine control device 5 may transmit a doffing command to the doffing device 3 to instruct which winding unit 2 is to be used for doffing.

Claims

1. A static pressure control method for an automatic winder including a plurality of winding units capable of being connected by a suction air flow, a suction blower generating the suction air flow, and a static pressure detection unit detecting a static pressure of the suction air flow,

the static pressure control method of an automatic winder is characterized in that,

the disclosed device is provided with:

a starting step of operating the suction blower so that a static pressure of the suction air flow becomes higher than a predetermined set value when the plurality of winding units are started;

an initial feedback step of performing feedback control of the frequency of the suction blower in order to reduce the static pressure of the suction air flow to the set value after the start-up step; and

a normal feedback step of performing feedback control of the frequency of the suction blower after the initial feedback step in order to maintain the static pressure of the suction air flow at the set value,

the control cycle of the initial feedback step is set to be shorter than the control cycle of the normal feedback step.

2. The static pressure control method of an automatic winder according to claim 1,

the detection cycle of the initial feedback process, which is detected by the static pressure detection unit, is set to be shorter than the detection cycle of the normal feedback process.

3. The static pressure control method of an automatic winder according to claim 1 or 2,

the acceleration/deceleration rate of the frequency of the suction blower in the initial feedback step is set to be faster than the acceleration/deceleration rate in the normal feedback step.

4. The static pressure control method of an automatic winder according to claim 1 or 2,

in the start-up step, the frequency of the suction blower is first increased, and when the instantaneous value of the static pressure detected by the static pressure detection unit becomes equal to or greater than a start-up setting value set to be higher than the setting value, the frequency of the suction blower is maintained at a point in time when the instantaneous value becomes equal to or greater than the start-up setting value.

5. The static pressure control method of an automatic winder according to claim 1 or 2,

in the starting step, when the starting of the plurality of winding units is completed, the process proceeds to the initial feedback step.

6. The static pressure control method of an automatic winder according to claim 1 or 2,

in the initial feedback step, when the instantaneous value of the static pressure detected by the static pressure detection unit becomes equal to or less than the set value, the frequency of the suction blower is maintained at the frequency at the time when the instantaneous value becomes equal to or less than the set value for the remaining period of the control cycle.

7. The static pressure control method of an automatic winder according to claim 1 or 2,

in the initial feedback step, when the time average value of the static pressure detected by the static pressure detecting unit in the previous control cycle is equal to or less than the set value, the process proceeds to the normal feedback step.

8. A static pressure control method for an automatic winder including a plurality of winding units capable of being connected by a suction air flow, a suction blower generating the suction air flow, and a static pressure detection unit detecting a static pressure of the suction air flow,

feedback control is performed on the frequency of the suction blower in order to maintain the static pressure of the suction air flow at a predetermined set value,

when the time average value of the static pressure detected by the static pressure detection unit in the previous control cycle is smaller than the set value, the increase of the frequency of the suction blower is started, and when the instantaneous value of the static pressure detected by the static pressure detection unit becomes equal to or larger than the set value, the increase of the frequency of the suction blower is stopped.

9. An automatic winder includes:

a plurality of winding units capable of performing splicing by using a suction air flow;

a suction blower generating the suction air flow;

a static pressure detection unit that detects a static pressure of the suction airflow; and

a control unit for controlling the operation of the suction blower based on the static pressure detected by the static pressure detection unit,

the automatic winder is characterized in that,

the control unit is capable of executing the static pressure control method of the automatic winder according to any one of claims 1 to 8.