CN112840068B - Method for regulating pressure on drafting mechanism - Google Patents
Method for regulating pressure on drafting mechanism Download PDFInfo
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- CN112840068B CN112840068B CN201980067433.XA CN201980067433A CN112840068B CN 112840068 B CN112840068 B CN 112840068B CN 201980067433 A CN201980067433 A CN 201980067433A CN 112840068 B CN112840068 B CN 112840068B
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- China
- Prior art keywords
- pressure
- rollers
- drafting mechanism
- textile machine
- drafting
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/46—Loading arrangements
- D01H5/52—Loading arrangements using fluid pressure
- D01H5/525—Loading arrangements using fluid pressure for top roller arms
Abstract
In a pressure control method for rollers (125-128) of a drafting system, operating parameters are detected which influence the loading of the rollers (125-128) of the drafting system. In the partial process, the pressure of the rollers (125-128) on the drafting system is detected and displayed by means of the detected operating parameters. The method allows a user to vary the pressure on the rollers (125-128) on the drafting mechanism. The method may include ascertaining whether the detected operating parameter is within a predetermined range, or ascertaining whether the detected operating parameter does not exceed or exceeds a predetermined threshold. When the result is negative, the pressure on the rollers (125-128) on the drafting mechanism is changed so as to appear that the given condition has been met. In order to press the upper draft gear rollers (125-128) against the lower draft gear rollers (129-131) by means of the pressure arms (121-124), a pressure drive section (139; 132, 133;134, 135; 141) of a draft gear device (120) having a plurality of lower draft gear rollers, upper draft gear rollers and pressure arms (121-124) is provided. The control (141) carries out the method by means of pressure-driven sections (139; 132, 133;134, 135; 141) for the upper rollers (125-128) of the drafting system. The pressure drive section (139; 132, 133;134, 135; 141) has a pressure regulator (141) which is connected between a pneumatic drive for the upper rollers (125-128) of the drafting system and the associated pressure arm (121-124).
Description
Technical Field
The invention relates to a method for regulating the pressure of elements of a drafting system.
Background
The drafting mechanism essentially consists of a plurality of driven lower rollers against which one or more associated upper rollers are pressed. As a result of this pressing force, the upper roller is rotationally driven by the associated lower roller. The driving is facilitated by means of, for example, a preferably elastic friction lining or friction lining on the upper roller. The fibrous material is additionally guided through between the associated pairs of rollers. The pressing force firmly fixes the fibre material relative to the downstream arrangement of the lower and upper rolls, whereby drafting is achieved. Not only the fastening of the fibre material but also the carrying of the attached, extruded unwinding roller leads to wear of the sheath. Excessive compressive forces promote faster wear. Further, the load of the bearing in which the roller is rotatably accommodated becomes large. These must be designed accordingly, which is costly.
Disclosure of Invention
The object of the invention is to address the aforementioned disadvantages.
The invention relates to a method for controlling the pressure of rollers on a drawing mechanism of a textile machine. The method has a cycle here. The cycle comprises a first step of detecting at least one operating parameter of the textile machine that affects the load of the rollers on at least one drafting mechanism. The operating parameters relate, for example, to the fibrous material used, the operating speed of the rollers on the drawing frame and the climate conditions. The cycle further comprises a second step. The second step is divided into different sub-processes. The first sub-process comprises a first sub-step of determining the pressure of the rollers on the at least one drawing mechanism by means of the detected operating parameters. In a second sub-step of the sub-process, the determined pressure is displayed. In a third sub-step, the user is allowed to change the pressure on the rollers on at least one of the drafting mechanisms, for example by means of a touch-sensitive screen. Alternatively or additionally to the first sub-process, a second sub-process is specified. The second sub-process includes a fourth sub-step of determining whether the detected operating parameter is within a predetermined range or whether the detected operating parameter is below or exceeds a predetermined threshold. If it has been determined that the detected operating parameter is outside the range, or that the detected operating parameter exceeds or falls below the threshold, the second sub-process comprises a fifth sub-step of changing the pressure on the rollers on the drawing frame so as to appear as if the predetermined operating parameter is within the range, or at or above or below the threshold. In other words, an automated pressure regulation is involved here. Based on this, the load of the drafting mechanism rollers can be optimized, so that the wear is smaller.
The method preferably also has an initial step of determining the range or threshold before the aforementioned loop is implemented. This value is determined, for example, before the drafting mechanism begins to operate and is used as a basis for the aforementioned adjustment.
The initial step preferably comprises a step of allowing the input of said range or threshold value and/or a step of determining said range or threshold value on the basis of the processing speed of the textile machine and the fibrous material currently to be processed. In particular, the last-mentioned step allows the drafting mechanism to be started again very quickly on a batch change; the downtime is reduced.
The determining step is preferably performed by means of a reading database in which at least the speed data, the data defining the fibrous material and the data defining the pressure of the rolls on the drawing frame are associated with each other. The database thus shows a knowledge base for the adjustment of the drafting mechanism, so that only one necessary input has to be made.
Each of the foregoing methods is preferably configured as an autonomous learning method. In this case, the advantage is that the learning is monitored and can be carried out, for example, by the manufacturer on newly designed drafting systems. This has the advantage that the drafting mechanism at the customer is in the ideal case immediately ready for use without adjustment.
The foregoing cycle is preferably repeated at regular intervals. This can lead to the climate conditions repeating over the last half of a day and changing over the course of a day, which changes the setting of the press rolls. Alternatively or additionally, the loop is implemented when a predetermined state exists.
Such a condition may involve a change of the fibrous material to be drafted, or a change of the rolls, or also a (re) start of the drafting mechanism or textile machine.
In each of the foregoing methods, the one cycle may be performed multiple times depending on the number of rolls on the drafting mechanism to be monitored and/or in relation to the pressures of the rolls on the multiple drafting mechanisms. In the first case, the pressure to each lower roller is regulated individually in extreme cases. In the second case, the pressure adjustment of the plurality of lower rolls is performed, and in the extreme case the same pressure adjustment is performed for all lower rolls.
The operating parameters given above preferably include process output parameters of the drafting mechanism or of the textile machine and/or load data of at least one drive motor of a lower drafting mechanism roller which is associated with at least one upper drafting mechanism roller. In other words, the data to be simply determined in a sensor-type manner is sufficient to achieve pressure regulation.
Each of the foregoing methods is preferably configured as a computer-implemented method. The method can thus be provided, for example, as a firmware update, so that existing textile machines can likewise be retrofitted with the pressure regulation according to the invention.
The invention further relates to a drafting device comprising a pressure-driven section, which has, for example, at least one pneumatic cylinder and at least one drafting device. The drafting mechanism is provided with a plurality of drafting mechanism lower rollers, a plurality of drafting mechanism upper rollers and a plurality of pressure arms. The pressure arm is connected to the pressure drive section in such a way that the pressure drive section can press one of the associated upper draft gear rollers against the associated lower draft gear roller by means of the pressure arm. The drafting device further comprises a controller or is connected to such a controller, for example via a bus. The control is designed to carry out any of the methods described above by means of at least one pressure-driven section for the rolls on the at least one drawing frame. In other words, the present invention can be widely put into practical use.
The textile machine according to the invention has such a drafting mechanism arrangement. The pressure drive section here comprises a pressure regulator which is connected between a pneumatic drive for the at least one upper roller of the drafting system and a pressure arm belonging to the at least one upper roller of the drafting system. The pressure regulator relates to, for example, a membrane regulating valve.
The textile machine is preferably configured as a drawing frame, a lap machine, a comber, a roving frame or a spinning frame.
Drawings
Additional features and advantages of the invention are set forth in the description of the preferred embodiments which follows. In the figure:
figure 1 shows a drawing arrangement in which,
figure 2 shows the drawing section of figure 1 in enlarged detail,
FIG. 3 shows a manner of adjustment according to an embodiment of the invention, an
Fig. 4 shows an adjustment according to another embodiment of the invention.
Detailed Description
Fig. 1 shows an arrangement 1 with a creel 2 and a downstream drawing frame 100 in a conventional arrangement.
The creel 2 is constructed in a known manner and will not be described further.
Further, the drawing frame 100 has a winding device 110 on the outlet side. In the example shown, the winding device 110 comprises a can rail 111 for a full can and a preferably driven can rail 112, which can rail 112 moves an empty can into the actual can changer. In a known manner, the can changer has, for example, a can mover 113. An operating platform 102 is located on the side of the drawing frame 100. The operating terminal 101 is here located at the end of the operating platform 102. Furthermore, a draft gear housing 103 can be seen, which draft gear housing 103 covers the draft section 120 in a known manner.
Fig. 2 shows the drawing section 120 of fig. 1 in enlarged detail. The drawing section 120 is illustratively embodied as a four-top three-bottom drawing mechanism. In other words, the drafting section 120 has four upper rollers 125-128 (only upper roller 125 and upper roller 126 can be seen). The upper roller 125 is pressed against the associated lower roller 129 by means of bearings 132, 133 and by means of pressure pistons 134, 135, the upper roller 125 being rotatably mounted in the bearings 132, 133.
The upper roller 126 is correspondingly pressed against the associated lower roller 130. The upper rollers 127, 128, which are not visible here, are pressed against the lower roller 131 by means of the pressure arms 123, 124.
On the left side of this figure, a pneumatic line 139 is visible, through which line 139 compressed air is led into the pressure arms 121-124. The pressure is alternatively led into only the two pressure arms 121, 122 that are the front.
In addition, a sensor line 140 leading into the respective pressure arm 121-124 can be seen. Pressure sensors, for example, or sensors which can determine the removal position of the associated upper rollers 125 to 128, are provided in the pressure arms 121 to 124.
In addition, pressure bars 136-138 can be seen which are likewise pressed against the respective upper rollers 125-127 in order to reduce or completely avoid the formation of a wrap.
Fig. 3 shows the adjustment of the drawing section 120 shown in fig. 2. According to the embodiment shown here, a separate pressure regulator 141 is provided which acts directly on each upper roller 125-128 via pneumatic line 139. It is clear that this is only illustrative. The pressure regulator 141 is actually connected to the respective pressure cylinder, which is pressed by the associated piston 134, 135 against the respective bearing 132, 133 of the associated upper roller 125.
The initial adjustment value is input to the pressure regulator 141 via a coupling or data connection 143. According to the invention, the adjustment value depends on the fibre material. Different adjustment values are input to the pressure regulator 141 according to the friction coefficient and the setting of the drafting mechanism.
The pressure regulator 141 is input with a value by means of a sensor device 142, which may comprise a sensor, for example as shown in fig. 2, which value influences the adjustment of the pressure applied by the upper rollers 125-128 to the appurtenant lower rollers 129-131. Such a sensor value may be, for example, the maximum removal position of the corresponding upper roller 124-128. For example, if some wear occurs in the mantle layer of the attached lower roll 129-131, the resistance of the elastic mantle layer decreases, so that the pressure regulator 141 transmits a reduced pressure to the attached lower roll 129-131, which pressure is less than the pressure when the mantle layer is fresh. Whereby wear of the mantle layer of the attached lower roll 129-131 can be reduced, which makes the life cycle longer.
Fig. 4 shows an adjustment according to another embodiment of the invention. As can be seen, an own pressure regulator 141 is assigned to each lower roller 129-131 or to the associated upper roller 120-128. Since the upper rollers 125 to 128 are generally provided with identical jacket layers, the same adjustment values are correspondingly fed to the pressure regulator 141 via the respective couplings 143.
By virtue of the coupling of each pressure regulator 141 to its own sensor device 142 via the sensor line 140, each pressure regulator 141 can individually adjust an optimized pressure for the respective lower roll 129-131 or the associated upper roll 125-128. Since the upper rollers 127, 128 are pressed against the same lower roller 131, it is provided in the example shown that the two upper rollers 127, 128 are acted upon by separate pressure regulators 141. However, it is of course likewise possible to provide for a separate pressure regulator 141 to be associated with each upper roller 127, 128.
By means of the illustrated adjustment, the invention enables a method for adjusting the pressure of the upper rollers 125-128 of the drafting mechanism relative to the associated lower rollers 129-131 of the drafting section 120. In a first step, at least one operating parameter is detected, which influences the loading of the rollers 125 to 128 on the at least one drawing frame. Such operating parameters may take into account the fibrous material to be processed, the rotational speed of the corresponding lower rollers 129-131 of the drawing mechanism, and the ratio of this rotational speed to the rotational speed of the lower rollers 130, 131 immediately upstream in the direction of transport of the fibrous web.
In a first partial process of the second step of the method, the pressure of the rollers 125 to 128 on the respective drawing frame is determined by means of at least one detected operating parameter. If, for example, some wear of the mantle layer of the rollers 125-128 on the respective drafting mechanism is seen, the pressure is automatically reduced by some, for example based on a database. In this sub-process, the determined pressure is preferably displayed to the user.
In a third sub-step of the sub-process, the user is also allowed to change the pressure. Whereby the automatically determined value may be changed, for example, based on empirical values. The determined value is therefore a suggestion and thereby simplifies the operation of the drawing section 120. The drawing section 120 can thus likewise be operated by a less experienced user.
Alternatively or additionally, a second sub-process may be specified with respect to the sub-process. The sub-process includes determining whether the detected operating parameter is within a predetermined range. This can be achieved by means of conventional threshold analysis. If the operating parameter is outside this range, or if a predetermined threshold is not reached in an acceptable manner, or is below or exceeds a predetermined threshold, the pressure on the rollers 125-128 of the associated drawing mechanism is adjusted such that it appears that the predetermined operating parameter is within the desired range, or the threshold analysis gives positive results. The method is thus to bring the pressure close to that necessary for friction-free operation of the drawing section 120. Furthermore, this avoids abrupt pressure changes, which can have a negative effect during the drawing process.
The range or threshold is preferably initially determined in a first step. Such a determination may include, for example, reading a database. But of course, it is also possible to provide that the range or threshold value can be entered.
The method can also be designed as an autonomous learning method. This means that the drafting section 120 automatically adapts the pressure during the test run and that the associated pressure regulator 141 is preferably trained in the present method, so that it adapts automatically after a conventional learning process.
The above method steps form a repeatable cycle according to the invention. The repetition can be performed at regular intervals, for example once per hour, or when a predetermined state is present. The state may be a change of fibrous material to be drawn, a change of rolls, and/or a (re) start of the drawing section 120 or the drawing frame 100.
The circulation is preferably carried out several times depending on the number of rollers 125 to 128 on the drafting system to be monitored, in other words up to four times on the drafting system 120 described. As shown in the lower right of fig. 4, if the cycle involves a plurality of drafting mechanism upper rollers 127-128 at the same time, the cycle is carried out three times, for example.
The aforementioned operating parameters may include process output parameters of the drawing section 120 or drawing frame 100. Furthermore, load data of the drive motor (e.g., temperature of the drive motor) can be used to avoid overloading the drive of the drafting section 120. This allows braking of the drafting section 120, wherein, despite a reduction in its productivity, damage to the drafting section 120 and thus a shutdown can be avoided.
The method according to the invention is preferably implemented by a computer.
The present invention is not limited to the foregoing embodiments.
The invention can be applied to any type of drafting section. This relates, for example, to drafting mechanisms on winders, combers, roving frames and spinning frames.
In addition, other sets of upper rollers 125-128 may also be associated with separate pressure regulators 141.
The drafting section 120 can likewise be additionally designed, i.e. comprise a further number of upper rollers and/or lower rollers.
The invention finally provides the possibility of being very simple and universally usable for optimally adjusting the pressure of the rollers 125-128 on the drawing mechanism and thereby improving the life of the rollers 125-128 on the drawing mechanism and the machine by means of the entire content.
List of reference numerals
1. Drafting arrangement structure
2. Bobbin creel
100. Drawing frame
101. Operation terminal
102. Platform
103. Draft mechanism cover
110. Coiling device
111. Barrel sliding rail
112. Barrel guide rail
113. Barrel shifter
120. Drafting section
121-124 pressure arm
125-128 upper roller
129-131 lower roll
132. 133 bearing
134. 135 piston
136-138 pressure rod
139. Pneumatic pipeline
140. Sensor circuit
141. Pressure regulator
142. Sensor device
143. Coupling part
Claims (10)
1. A textile machine having a drafting mechanism device,
the drafting mechanism device comprises a pressure driving section and at least one drafting mechanism, the drafting mechanism comprises a plurality of drafting mechanism lower rollers, a plurality of drafting mechanism upper rollers and a plurality of pressure arms, the pressure arms are coupled with the pressure driving section, so that the pressure driving section can roll one auxiliary drafting mechanism upper roller of the drafting mechanism upper rollers to the auxiliary drafting mechanism lower roller through the pressure arms, and
the drafting mechanism device also comprises or is coupled with a controller which is designed to implement a method for adjusting the pressure of the upper rollers of the drafting mechanism of the textile machine by means of at least one pressure driving section for the upper rollers of the drafting mechanism,
wherein the pressure drive section has a pressure regulator which is connected between a pneumatic drive for the at least one upper drawing frame roller and a pressure arm belonging to the at least one upper drawing frame roller,
wherein each pressure regulator is coupled to its own sensor device via a sensor line,
the method has a cycle comprising
A first step: detecting at least one operating parameter of the textile machine, said operating parameter affecting the load of the rollers on at least one drafting mechanism, and
a second step, comprising a first sub-process and a second sub-process,
the first sub-process has
A first substep: determining the pressure of the rollers on at least one of the drawing units by means of the detected operating parameters,
a second substep: displaying the determined pressure, and
third substep: allowing a user to vary the pressure on the rollers on at least one of said drafting mechanisms,
the second sub-process has
Fourth substep: determining whether the detected operating parameter is within a predetermined range or whether the detected operating parameter is below or exceeds a predetermined threshold, and
fifth substep: if the detected operating parameter is determined to be outside the range, or if the detected operating parameter is determined to be above or below the threshold, changing the pressure on the rollers of the drafting mechanism so as to appear that the predetermined operating parameter is within the range or is below or above the threshold, and
initial step: the range or threshold is determined prior to implementing the loop.
2. The textile machine of claim 1, wherein the initiating step includes
A step of allowing the input of said range or threshold, and/or
A step of determining said range or threshold value on the basis of:
-the processing speed of the textile machine, and
-fibrous material currently to be processed.
3. Textile machine according to claim 2, wherein the determining step is performed by means of a reading database in which at least processing speed data, data defining the fibrous material and data defining the pressure of the rolls on the drawing frame are associated with each other.
4. A textile machine according to one of claims 1 to 3, the method for adjusting the pressure of the rollers on the drafting mechanism of the textile machine being configured as an autonomous learning method.
5. A textile machine according to one of claims 1 to 3, wherein the circulation
Repeating at regular intervals, and/or
When a predetermined state exists.
6. The textile machine of claim 5, wherein the condition comprises
Replacement of the fibrous material to be drafted,
replacement of the roller, and/or
Start or restart of the drafting mechanism or textile machine.
7. A textile machine according to one of claims 1 to 3, wherein said one cycle
Depending on the number of rollers on the drafting mechanism to be monitored, and/or
In relation to the pressure of the rolls on the plurality of drafting mechanisms.
8. A textile machine according to one of claims 1 to 3, wherein the at least one operating parameter comprises
Output parameters of the drafting mechanism or textile machine in the process, and/or
Load data of at least one drive motor of a lower draft gear roller, which is attached to at least one upper draft gear roller.
9. A textile machine according to one of claims 1 to 3, wherein the method for adjusting the pressure of the rollers on the drafting mechanism of the textile machine is configured as a computer-implemented method.
10. The textile machine according to claim 1, configured as a drawing frame,
the ribbon winding machine is a ribbon winding machine,
comber the process comprises,
roving frame, or
Spinning frame.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018125547.0A DE102018125547A1 (en) | 2018-10-15 | 2018-10-15 | Pressure control on a drafting system |
| DE102018125547.0 | 2018-10-15 | ||
| PCT/EP2019/074976 WO2020078651A1 (en) | 2018-10-15 | 2019-09-18 | Closed-loop pressure control in a drafting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112840068A CN112840068A (en) | 2021-05-25 |
| CN112840068B true CN112840068B (en) | 2023-04-28 |
Family
ID=67998472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980067433.XA Active CN112840068B (en) | 2018-10-15 | 2019-09-18 | Method for regulating pressure on drafting mechanism |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3867427A1 (en) |
| CN (1) | CN112840068B (en) |
| DE (1) | DE102018125547A1 (en) |
| WO (1) | WO2020078651A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19652372A1 (en) * | 1996-12-17 | 1998-06-18 | Zinser Textilmaschinen Gmbh | Pneumatic loading device of a drafting system in a spinning machine |
| DE10140645B4 (en) * | 2000-08-23 | 2011-11-24 | Rieter Ingolstadt Gmbh | Method for operating a drafting system and drafting system |
| CH696467A5 (en) * | 2002-07-29 | 2007-06-29 | Truetzschler Gmbh & Co Kg | Apparatus for loading of the top rollers of a drafting for textile slivers. |
| DE102005020506A1 (en) * | 2005-04-29 | 2006-11-09 | TRüTZSCHLER GMBH & CO. KG | Device on a drafting system of a spinning machine, in particular track, card, combing machine o. The like., To load the drafting rollers, with at least one pressure cylinder |
| ITTO20110693A1 (en) * | 2010-08-11 | 2011-10-27 | Rieter Ingolstadt Gmbh | IRONING MECHANISM OF A TEXTILE MACHINE AS WELL AS PROCEDURE FOR ITS OPERATION |
| DE102011113367A1 (en) * | 2011-09-15 | 2013-03-21 | Trützschler GmbH & Co Kommanditgesellschaft | Device on a spinning preparation machine, in particular track, carding machine, combing machine or the like. with a drafting system |
| DE102014117241A1 (en) * | 2014-11-25 | 2016-05-25 | Rieter Ingolstadt Gmbh | Method for optimized stretching of at least one sliver in a textile machine and textile machine |
-
2018
- 2018-10-15 DE DE102018125547.0A patent/DE102018125547A1/en active Pending
-
2019
- 2019-09-18 CN CN201980067433.XA patent/CN112840068B/en active Active
- 2019-09-18 WO PCT/EP2019/074976 patent/WO2020078651A1/en unknown
- 2019-09-18 EP EP19772703.5A patent/EP3867427A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020078651A1 (en) | 2020-04-23 |
| CN112840068A (en) | 2021-05-25 |
| DE102018125547A1 (en) | 2020-04-16 |
| WO2020078651A9 (en) | 2020-06-11 |
| EP3867427A1 (en) | 2021-08-25 |
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