CN113201819A

CN113201819A - Device for adjusting roller gauge of drafting system

Info

Publication number: CN113201819A
Application number: CN202011186736.4A
Authority: CN
Inventors: 邱丽遐
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-08-03

Abstract

The invention provides a roller gauge device of an automatic drawing frame, a combing machine and a carding machine drafting system. A control system for precisely controlling the rotation or the reverse rotation and the number of rotations of the motor to advance or retreat the screw; the screw rod drives the driving rod sleeved with the screw rod to move; the driving rod drives the sliding block to move; the slider drives the bottom roller arranged on the roller base to move, so that the bottom roller advances or retreats relative to the No. 1 bottom roller, and the distance of the roller gauge is automatically adjusted. The roller gauge can be precisely controlled by the number of revolutions and the steering of the motor. The method for automatically setting the roller gauge is used for replacing manual roller gauge setting on the premise of replacing fiber strip raw material types, fiber lengths, fiber blending ratios and the like, thereby providing an automatically optimized and automatically adjusted roller gauge setting method and an automatically roller setting device.

Description

Device for adjusting roller gauge of drafting system

Technical Field

The invention relates to textile machinery, in particular to roller gauge setting of a drafting system of a drawing frame, a combing machine and a carding machine.

Background

In the short fiber spinning process, in the process of making cotton, chemical fiber or wool and the blended raw materials of the cotton, the chemical fiber or the wool into yarns, a carding machine, a drawing frame and a combing machine are indispensable procedures. In carding, drawing and combing machines, the core component is the drafting system. Generally, a carding machine with an integrated drawing frame adopts a 2-up 2-down (a drafting system consisting of 2 bottom rollers and 2 upper leather rollers) drafting system, and the drawing frame adopts a 4-up 3-down (a drafting system consisting of 3 bottom rollers and 4 upper leather rollers) drafting system; the combing machine employs a 3-up, 3-down (3 bottom rollers and 3 top leather rollers) drafting system. Conventionally, bottom rollers arranged in the draft system in the backward direction from the side facing the fiber sliver to be drafted are referred to as a 1 st bottom roller, a 2 nd bottom roller, and a 3 rd bottom roller. The distance between the axial leads of the 1 st bottom roller and the 2 nd bottom roller is called as the gauge of the main drafting roller; the distance between the axial leads of the 2 nd bottom roller and the 3 rd bottom roller is called as the back zone drafting roller gauge. The roller gauge, as a drawing frame, a combing machine and a carding machine, is a very important process parameter. For different fiber strip types and fiber lengths, different roller gauge distances are necessary, and correct roller gauge distance setting can greatly improve the quality of the fiber strips, thereby influencing the quality of yarns.

In the draft system, it is known that the position of the 1 st bottom roller is generally fixed, the 2 nd and 3 rd bottom rollers are movable with respect to the 1 st bottom roller, and the positions of the 2 nd and 3 rd bottom rollers are set to be different depending on the fiber length of the processed material, thereby setting different main draft roller gauge and rear draft roller gauge. In the actual production of carding machines, drawing frames and combing machines, the fiber length, the raw material type and the mixing ratio of the processed fiber raw materials are different, and different roller gauge distances are generally set when changing batches, spinning or raw materials every time, so that the optimal drafting state of the fibers of fiber strips is achieved. At present, the setting of the roller gauge is realized by manually setting the main drafting roller gauge and the rear zone drafting roller gauge by operators with the help of gauge pieces with different thicknesses, one of the defects of the process is that the process is complex and time-consuming, the requirements for the operators are very high, and the other defect is that the setting of the gauge each time is not accurate due to the proficiency of different operators, and the two ends of the roller can not be kept synchronous; the minimum accuracy of such a set gauge is usually only in the range of 1 mm. With the trend of automation and intelligent development of textile factories and the current situation that a proper operator is more and more difficult to find, aiming at the current defect of adjusting the roller gauge of a drafting system, how to overcome the current tedious roller gauge adjustment which is manual and can not ensure the precision, realize the automatic adjustment of the roller gauge and simultaneously keep the precision of the roller gauge. Further, the recommended value of the gauge also needs an experienced textile technician to estimate a proper gauge value according to the type and length of the fiber, and a computer can not automatically optimize the recommended gauge value with the best quality of the fiber strips according to the type and length of the fiber strips. Many textile machine suppliers are also seeking improved methods. For example, patent ZL200820015221.6 "T-shaped guide bearing seat fixing device" proposes a scheme: the roller is installed on the roller bearing seat, the roller bearing seat is connected with the T-shaped guide key and the T-shaped guide key base, and the roller bearing can slide on the T-shaped guide key base along the T-shaped guide key, so that the gauge between the rollers is adjusted. The invention can realize that the roller bearing is easily moved manually, but the gauge of the roller still needs to be measured by the gauge sheet, and the automatic and intelligent adjustment of the gauge of the roller can not be realized. For example, patent CN103374772B "textile machine with at least two drawing frames with the same function", a method for centrally adjusting the roller gauge of a binocular drawing frame by a first setter and a second setter realizes the method for keeping the gauge of the rollers of the two eyes adjusted at the same time and ensuring the rollers to be parallel; however, the solution proposed by the invention still requires an operator to manually adjust by means of scales and tools, and does not realize automatic and intelligent adjustment of the gauge of the roller.

Disclosure of Invention

The invention provides an automatic adjusting device and a method for roller gauge of a drafting system and a method for recommending optimized drafting system gauge set value according to fiber strip raw material and fiber length.

The specific technical solution of the present invention to solve the problem is described as follows.

An automatic roller gauge regulating device and method for drafting system is disclosed, which is realized by the following principle.

For a combing machine drafting system adopting 3 upper rollers and 3 lower rollers (3 upper leather rollers and 3 lower bottom rollers) and a drawing frame drafting system adopting 4 upper rollers and 3 lower rollers (4 upper leather rollers and 3 bottom rollers), the method for automatically setting the gauge of the main drafting roller (the gauge between the 1 st bottom roller and the 2 nd bottom roller) comprises the following steps:

the two ends of the No. 1, No. 2 and No. 3 bottom rollers are respectively arranged on the corresponding roller bases, the roller bases at the two ends of the No. 1 bottom roller are fixed and do not move, and the roller bases at the two ends of the No. 2 bottom roller and the No. 3 bottom roller are respectively connected with the two sliding blocks; the two sliding blocks are connected with a driving rod; the driving rod is sleeved on a screw rod, and the driving rod is driven to move by the rotation of the screw rod; the driving rod drives the two sliding blocks to move in parallel at the same time. The screw rod and the driving rod form a structure similar to a ball screw.

Further, the slider parallel movement drives the 2 nd and 3 rd bottom rollers to move together in parallel, so that the positions of the 2 nd and 3 rd bottom rollers are changed relative to the 1 st bottom roller, namely, the distance between the 2 nd bottom roller and the 1 st bottom roller is changed, and the distance between the 2 nd bottom roller and the 3 rd bottom roller rear zone drafting rollers is kept unchanged. This main draft roller gauge is precisely controlled by the screw, while the distance between the 2 nd and 3 rd bottom rollers (back draft roller gauge) is kept constant. Further, the screw is driven by a motor; the motor is controlled by a control system.

Further, the control system instructs the motor to rotate or rotate in the opposite direction, so that the screw rod is driven to advance or retreat, the 2 nd bottom roller advances or retreats relative to the 1 st bottom roller, and the distance of the gauge of the main drafting roller is changed. The gauge of the main drafting roller can be accurately controlled by the rotation number of the motor. As a preferred embodiment of the invention, the accuracy of the screw reaches a minimum of 0.1mm, thereby ensuring that the value of the roller gauge is accurately calculated at a minimum accuracy of 0.1 mm. Preferably, the adjustable range of the gauge of the main drafting roller is as follows: 5.0mm-120.0 mm. The roller gauge of the invention refers to the distance between the axial leads of two rollers.

Further, the control system acquires the input sliver information through a human-computer interface of the control system, and gives a recommended value of the preferred main drafting roller gauge distance through an empirical value and an algorithm stored in the system; or the control system directly acquires the input gauge distance value of the main drafting roller through a human-computer interface.

And further, comparing the gauge value of the recommended main drafting roller or the gauge value of the main drafting roller which is directly input with the actual gauge value of the main drafting roller on the current machine, and calculating the change amount required by the gauge of the main drafting roller. According to this amount of change, it may be increased or decreased, thereby controlling the rotation direction and the number of rotations of the motor; therefore, the motor drives the screw to increase or decrease the position of the 2 nd bottom roller relative to the 1 st bottom roller, thereby achieving the specified main drafting roller gauge.

Based on the same principle, the method for automatically setting the back zone drafting roller gauge (the gauge between the 2 nd bottom roller and the 3 rd bottom roller) for the drafting system of the combing machine adopting 3 upper and 3 lower (3 upper leather rollers and 3 lower bottom rollers) and the drafting system of the drawing machine adopting 4 upper and 3 lower (4 upper leather rollers and 3 bottom rollers) is as follows:

the roller bases on two sides of the 3 rd bottom roller are respectively connected with two sliding blocks, and the two sliding blocks are connected with a driving rod; the driving rod is sleeved on a screw rod, and the driving rod is driven to move by the rotation of the screw rod; the screw rod and the driving rod form a structure similar to a ball screw. Thereby the actuating lever removes and drives two slider parallel movement simultaneously, and meanwhile, 2 nd bottom roller guarantees that the position is unchangeable to realize that the distance between 3 rd bottom roller and the 2 nd bottom roller changes, be promptly back district draft roller gauge changes. This said amount of change is precisely controlled by the forward or backward movement of the screw, and the distance of forward and backward movement. Based on the precision of the screw selected, it is preferable to achieve a precision of 0.1mm, thereby ensuring that the roller gauge value is accurate to a minimum precision of 0.1 mm. Preferably, the adjusting range of the back zone drafting roller gauge is 5.0-120.0 mm. The roller gauge of the invention refers to the distance between the axial leads of two rollers.

Further, the screw is driven by a motor, which is controlled by the control system.

Based on the same method for automatically adjusting the gauge of the main drafting roller, the control system gives a recommended value of the preferred rear zone drafting roller gauge through a human-computer interface, fiber strip information, empirical values and algorithms stored in the system; or the control system directly acquires the input back zone drafting roller gauge value through a human-computer interface.

And further, comparing the back zone drafting roller gauge value of the recommended back zone drafting roller gauge value or the back zone drafting roller gauge value directly input with the actual back zone drafting roller gauge value on the current machine, and calculating the required change amount of the back zone drafting roller gauge. According to this amount of change, it may be increased or decreased, thereby controlling the rotation direction and the number of rotations of the motor; therefore, the motor drives the screw to increase or decrease the position of the 3 rd bottom roller relative to the 2 nd bottom roller, so as to reach the specified back zone drafting roller gauge.

As a preferred mode of the present invention, a drawing system of a typical drawing frame has 4 upper and 3 lower drawing systems, 4 upper leather rollers and 3 bottom rollers. The 3 bottom rollers are respectively the 1 st, the 2 nd and the 3 rd bottom rollers. The automatic adjustment of the gauge of the main drafting roller between the 2 nd bottom roller and the 1 st bottom roller adopts the automatic gauge adjustment method of the main drafting roller of the invention; the back zone drafting roller gauge between the 3 rd bottom roller and the 2 nd bottom roller adopts the automatic back zone drafting roller gauge adjusting method.

As a preferred mode of the present invention, a typical drafting system of a combing machine has 3-up 3-down drafting systems, in which 3 top rollers and 3 bottom rollers. The 3 bottom rollers are respectively the 1 st, the 2 nd and the 3 rd bottom rollers. The automatic adjustment of the gauge of the main drafting roller between the 2 nd bottom roller and the 1 st bottom roller adopts the automatic gauge adjustment method of the main drafting roller of the invention; the back zone drafting roller gauge between the 3 rd bottom roller and the 2 nd bottom roller adopts the automatic back zone drafting roller gauge adjusting method.

As a preferred form of the invention, a typical drafting system of a carding machine with an integrated draw frame has a 2-over-2-under drafting system, with 2 top rollers and 2 bottom rollers. The 2 bottom rollers are respectively the 1 st bottom roller and the 2 nd bottom roller. Because the drafting system of the carding machine only has one drafting area, the back zone drafting roller gauge between the 2 nd bottom roller and the 1 st bottom roller adopts the automatic back zone drafting roller gauge adjusting method.

The other inventive technical point of the invention is as follows: the invention provides a method for automatically optimizing the gauge of a drafting system according to the information of fiber strips. The specific technical scheme is as follows: and the control system acquires the information of the fiber strips through a human-computer interface. Further, based on empirical values or system algorithms, the control system gives recommended values for N roller gauges (N1, N2, N3.., Nn) based on the acquired sliver information. The control system commands the motor to drive the screw according to each recommended roller gauge value (N1, N2, N3.., Nn), and adjusts the roller gauge to reach the designated roller gauge value (N1, N2, N3.., Nn).

Further, the equipment respectively produces a section of fiber strip under the condition of each recommended roller gauge value, and the quality indexes (Q1, Q2, Q3., Qn) of the fiber strip corresponding to each roller gauge value (N1, N2, N3., Nn) are respectively obtained through a fiber strip quality monitoring system of the equipment. And comparing the corresponding fiber strip quality indexes (Q1, Q2, Q3.., Qn), and automatically finding out the optimal fiber strip quality index value (such as Qx) by the control system, so as to know that the corresponding roller gauge value (such as Nx) is the optimal roller gauge corresponding to the fiber strip information. Further, the control system uses this optimum roller gauge value (Nx) as the preferred roller gauge value of the device.

As a preferred mode of the invention, for the drawing frame and the combing machine, according to the information of the fiber strips, in order to reduce the complexity of the operation, the control system recommends the main drafting roller gauge value to be 2 to 4 values; the back zone drafting roller gauge value recommended by the control system is 2 to 4 values. And respectively comparing corresponding fiber strip quality indexes based on recommended main drafting roller gauge and rear zone drafting roller gauge values, and analyzing an optimized main drafting roller gauge and rear zone drafting roller gauge as recommended values of the fiber strip raw material and the fiber length.

In a preferred aspect of the present invention, the method for automatically setting the gauge of the roller is used for setting the gauge of the roller instead of manual work on the premise of changing the type, kind, fiber length, fiber blending ratio, etc. of the fiber sliver raw material, thereby providing a method for automatically setting the gauge of the roller and an apparatus for automatically setting the roller, which are automatically optimized and adjusted.

In a preferred embodiment of the invention, the method for automatically setting the roller gauge is carried out automatically by a control system of the textile equipment under the condition that the production of the textile equipment is stopped.

In a preferred embodiment of the invention, the control system recommends a drafting roller gauge value of 2 to 6 values for the carding machine (2-over-2-under drafting system) of the integrated drawing frame, based on the sliver information, in order to reduce the complexity of the operation.

In a preferred embodiment of the present invention, the motor is a high-precision servo motor, and has two directions of rotation, i.e., forward and reverse.

In a preferred embodiment of the present invention, the accuracy of the movement control of the driving rod is 0.1mm in the ball screw structure including the screw and the driving rod.

In a preferred embodiment of the present invention, the adjustment ranges of the gauge of the main draft roller and the gauge of the back draft roller are 5.0mm to 120.0 mm.

In a preferred embodiment of the present invention, the information of the fiber strips is input into the control system through a human-computer interface. And the control system recommends the gauge of the main drafting roller and the gauge of the back zone drafting roller based on the information of the fiber strips.

In a preferred embodiment of the present invention, the information of the fiber strips is input into the control system through a human-computer interface. The control system recommends n main drafting roller gauge distances and a back zone drafting roller gauge distance based on the fiber strip information; further, the control system automatically adjusts the gauge of the n main drafting rollers and the gauge of the back zone drafting roller to respectively produce n sections of fiber strips and obtain the corresponding quality indexes of the n sections of fiber strips. And comparing the quality indexes of the n sections of fiber strips, and recommending a main drafting roller gauge and a rear zone drafting roller gauge value with the best fiber strip quality as the best gauge setting of the fiber strips.

In a preferred embodiment of the present invention, the set values of the gauge of the main draft roller and the gauge of the back draft roller are input to the control system through a human-computer interface.

In the present invention, the usage or terms are defined as follows.

The "1 st bottom roller" is a first bottom roller, referred to as the 1 st bottom roller, from the side of the drafted sliver in the direction of the sliver feed.

The "2 nd bottom roller" is a second bottom roller, referred to as the 2 nd bottom roller, starting from the side of the drafted sliver and going in the direction of the sliver input.

The "3 rd bottom roller" is a third bottom roller, referred to as the 3 rd bottom roller, starting from the side of the drafted sliver and extending in the direction of the sliver feeding.

The "main draft roller gauge", also referred to as "main draft gauge", means a distance (value) between axial lines of the 1 st and 2 nd bottom rollers in the drawing frame or the combing machine.

The "back zone draft roller gauge", also referred to as "back zone draft gauge", means the distance (value) between the axial lines of the 2 nd bottom roller and the 3 rd bottom roller in the drawing frame or the combing machine.

The "roller gauge", also called "draft gauge", refers to the distance (value) between the axes of two rollers.

The term "sliver information" refers to one or more of the indexes of sliver material type, fiber length, fiber fineness, and the like of the sliver.

The "quality index of the sliver" refers to one or more indexes such as weight of the sliver, CV% index value (CV%, CV1m%, CV3m%, CV5m%, CV10 m%), slubs, details, weight deviation a% of the sliver, and sliver bopp diagram.

The benefits of the present invention are as follows.

1. The invention provides a method and a device for automatically adjusting the gauge of a roller, which replace a fussy adjusting mode when the variety and the batch are changed manually, and not only realize the automatic adjustment of the gauge of the roller according to the gauge value of the roller input by a human-computer interface; and the proper roller gauge value is automatically recommended according to the information of the fiber strips input by the human-computer interface, and the recommended roller gauge value is automatically adjusted.

2. Further, the invention proposes that according to the fiber strip information, the system automatically recommends a series of roller gauge values, and then based on the roller gauge values, through comparing the quality indexes of the produced fiber strips under different roller gauge values, the optimal roller gauge value is optimally recommended. Thereby realizing the intelligent automatic selection of the roller gauge value of the optimal process.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate patent, and not limit the patent. In the drawings:

FIG. 1 is a schematic drawing of a typical draw frame drafting system.

FIG. 2 is a schematic diagram of a typical drafting system of a combing machine.

Fig. 3 is a schematic drawing of a carding machine with an integrated drawing frame drafting system.

FIG. 4 is a schematic top view of the automatic adjusting device for the gauge of the main draft rollers of the drawing frame and the combing machine.

FIG. 5 is a schematic side view of the automatic adjusting device for the gauge of the main draft rollers of the drawing frame and the combing machine.

FIG. 6 is a schematic top view of the automatic adjusting device for the gauge of the draft rollers in the back area of the drawing frame and the combing machine.

FIG. 7 is a schematic side view of the automatic adjusting device for the gauge of the draft rollers in the back area of the drawing frame and the combing machine.

FIG. 8 is a schematic top view of an automatic draft roller gauge adjusting device of a carding machine with an integrated drawing frame.

FIG. 9 is a schematic side view of an automatic draft roller gauge adjusting device of a carding machine with an integrated drawing frame.

FIG. 10 is a flow chart of automatic roller gauge adjustment for human-machine interface input of sliver information.

FIG. 11 is a roller gauge flow chart of automatic adjustment of the man-machine interface input main drafting and back zone drafting roller gauge.

FIG. 12 is a flow chart of a method for automatically optimizing draft roller gauge based on sliver information.

Description of reference numerals:

1. feeding the sliver can; 2. outputting the can; 3. fiber strips; 4. a cotton guide roller; 5. a coiling disc; 6. drafting the fiber strips; 7. rolling the cotton net; 8. combing the fiber strips; 9. a first drive lever; 10. a first screw; 11. a first screw pulley; 12. a first motor pulley; 13. a first belt; 14. a first motor; 15. a control system; 16. a second drive lever; 17. a second screw; 18. a second screw pulley; 19. a second motor pulley; 20. a second belt; 21. a second motor; 22. a drive rod; 23. a screw belt pulley; 24. a motor pulley; 25. a belt; 26. a motor; 27. a screw; D. drawing frame; C. a carding machine with an integrated drawing frame; E. a combing machine; df1. drafting system of draw frame; df2. drafting system of combing machine; DF3, drafting system of carding machine integrated drawing frame; C1. 1, a leather roller; C2. a 2 nd leather roller; C3. a 3 rd leather roller; C4. 4, a leather roller; r1, bottom roller 1; r2. bottom roller 2; r3. bottom roller 3; s1, a shaft axis of a first bottom roller is 1; s2, the shaft axis of the No. 2 bottom roller; s3, shaft axis of the No. 3 bottom roller; l1, main drafting roller gauge; l2, back zone drafting roller gauge; t1, a right base of a 1 st bottom roller; TT1. the 1 st bottom roller left base; t2, a right base of the No. 2 bottom roller; TT2. the 2 nd left roller base; t3, a right base of the 3 rd bottom roller; TT3. 3 rd bottom roller left base; p1, a 1 st right slide block; PP1, 1 st left slider; p2, a 2 nd right slide block; PP2. 2 nd left slider; p3, a right sliding block; PP3. left slider; F1. the moving direction of the slide block; F2. the rotation direction of the screw; F3. the direction of rotation of the motor; F4. a belt travel direction; F5. the direction of travel of the sliver.

Detailed Description

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

FIG. 1 is a schematic drawing of a typical draw frame drafting system. In general, from 4 to 8 fiber strands 3 are drawn off from the feed can 1 and fed together via the guide action of the draw roller 4 into the drawing system DF1 of the draw frame D. Fig. 1 shows only 4 feed cans 1 for a more visual presentation. In practice, there are typically 4 to 8 feed barrels 1. The fiber strip 3 fed into the drafting system DF1 passes through the drafting system DF1 consisting of 4 upper and lower leather rollers (C1, C2, C3, C4) and 3 lower rollers (R1, R2, R3) and under 4 upper and lower parts, and is drafted by the drafting system DF1, and under the action of fiber parallel and mixing, a drafted fiber strip 6 is formed and placed in the output sliver can 2 in a looping manner under the action of the looping disc 5 for use in the next process. The drafting system DF1 of the drawing frame D is composed of 4 upper and lower drafting systems which are composed of 4 leather rollers C4, 1 st leather roller C1, 2 nd leather roller C2 and 3 rd leather roller C3 which are arranged in sequence, and a 1 st bottom roller R1, a 2 nd bottom roller R2 and a 3 rd bottom roller R3. In general, the distance L1 between the axis S1 of the 1 st bottom roller R1 and the axis S2 of the 2 nd bottom roller R2 is generally defined as the "main draft roller gauge". The distance L2 between the axis S2 of the 2 nd bottom roller R2 and the axis S3 of the 3 rd bottom roller R3 is generally defined as the "back draft roller gauge". In the drawing frame, a main drafting roller gauge L1 and a back drafting roller gauge L2 are two very important process parameters. The main draft roller gauge L1 and the back zone roller gauge L2 have different set values based on the sliver information such as the kind of material fed to the sliver 3, the fiber length, and the sliver weight. In practice, this set value directly affects the quality of the drafted sliver 6, and therefore, it is particularly important to optimize the proper main draft roller gauge L1 and back draft roller gauge L2. In the existing drawing frame, the setting is manually set by means of the roller gauge, the setting process is complicated and time-consuming, the setting precision and accuracy are difficult to guarantee due to the manual proficiency, and the minimum precision is known to be 1 mm. Also with the help of the adjustment tool, adjust through observing the scale by the operative employee, also can't realize automatic regulation, can't satisfy intelligent and automatic development trend.

Further, FIG. 2 is a schematic view of a typical drafting system of a combing machine. The combing machine E is provided with a drafting system DF2, and the drafting system DF2 of the combing machine is arranged above and below 3 and consists of 2 drafting areas consisting of a 1 st leather roller C1, a 2 nd leather roller C2, a 3 rd leather roller C3, a 1 st bottom roller R1, a 2 nd bottom roller R2 and a 3 rd bottom roller R3. The distance L1 between the axis S1 of the 1 st bottom roller R1 and the axis S2 of the 2 nd bottom roller R2, as well as the drafting system DF1 of the drawing frame in fig. 1, is defined as the main draft roller gauge; the distance L2 between the shaft axis S2 of the 2 nd bottom roller R2 and the shaft axis S3 of the 3 rd bottom roller R3 is defined as the back drafting roller gauge. Typically, 8 web packages 1 are assembled together to form a comber sliver 8, fed to the drafting system DF2 of comber E, and the drafted sliver 6 is fed to the coiler 5 and looped into the output can 2 for further processing. Similarly, different fiber material types, fiber lengths, fiber strip weights, etc. of the comber sliver 8 to be fed require different main draft roller gauge L1 and back draft roller gauge L2. The suitable and optimized roller gauge (L1 and L2) is very important for the quality of the drafted fiber sliver 6.

Fig. 3 is a schematic drawing of a carding machine with an integrated drawing frame drafting system. A simplified carding machine integrated drawing frame drafting system DF3 is provided on the carding machine C, so that the use of a drawing frame D can be reduced, and the investment cost can be reduced. The drafting system DF3 of the integrated drawing frame of the carding machine C is generally a drafting system of a drafting zone composed of the 1 st leather roller C1, the 2 nd leather roller C2, the 1 st bottom roller R1 and the 2 nd bottom roller R2. And the distance L1 between the shaft axis S1 of the 1 st bottom roller R1 and the shaft axis S2 of the 2 nd bottom roller R2 is defined as the gauge of the drafting rollers of the carding machine. After the fiber sliver coming out of the carding machine C is drafted by the drafting system DF3, the drafted fiber sliver 6 is placed in the output can 2 in a looped manner under the action of the coiler 5 for use in the next process. Different sliver weights, types and fiber lengths, as in drawing frames and combing machines, require different draw roller gauges L1 of the carding machine. The roller gauge L1 is an important process parameter which directly influences the fiber strand 6.

From the exemplary draw frame D, combing machine E and carding machine C of fig. 1, 2 and 3, the main draft roller gauge L1 and the back draft roller gauge L2 are process parameters which influence the quality of the sliver 6. In the actual production at present, the setting of the roller gauge L1 and the roller gauge L2 are both completed manually. The invention provides an automatic and intelligent roller gauge (L1, L2) setting, which meets the intelligent and automatic development requirements of a spinning mill. The following examples illustrate the solution provided by the present invention in detail.

Example 1.

FIGS. 4 to 7 show an embodiment of the present invention for automatically adjusting the gauge of the main draft roller and the gauge of the rear draft roller of the drawing frame and the combing machine. Both the combing machine and the drawing frame are two drafting zones consisting of 3 bottom rollers, namely a main drafting zone and a rear drafting zone.

FIG. 4 is a schematic top view of the automatic adjusting device for the gauge of the main draft roller of the drawing frame and the combing machine. The 1 st bottom roller R1, the 2 nd bottom roller R2 and the 3 rd bottom roller form two drafting areas. The two ends of the 1 st bottom roller R1 are respectively positioned in the 1 st bottom roller right base T1 and the 1 st bottom roller left base TT1. The two ends of the 2 nd bottom roller R2 are respectively positioned in the 2 nd bottom roller right base T2 and the 2 nd bottom roller left base TT2. The two ends of the 3 rd bottom roller R3 are respectively positioned in the 3 rd bottom roller right base T3 and the 1 st bottom roller left base TT3. Wherein, the distance L1 between the shaft axis S1 of the 1 st bottom roller R1 and the shaft axis S2 of the 2 nd bottom roller R2 is the gauge of the main drafting roller; the distance L2 between the shaft center line S2 of the 2 nd bottom roller R2 and the shaft center line S3 of the 3 rd bottom roller R3 is the back drafting roller gauge.

In order to realize the automatic adjustment of the gauge L1 of the main drafting roller, the 1 st bottom roller R1 is positioned at the left and right bases (T1, TT 1) of the 1 st bottom roller; the roller left and right bases (T1, TT 1) remain unchanged in position, so that the 1 st bottom roller R1 remains unchanged in position.

The right roller base T2 of the 2 nd bottom roller R2 and the right roller base T2 of the 3 rd bottom roller R3 are connected with a 1 st right sliding block P1; the left roller base TT2 of the 2 nd bottom roller R2 and the right roller base TT3 of the 3 rd bottom roller R3 are connected with the 1 st left sliding block PP 1; the 1 st right slide block P1 and the 1 st left slide block PP1 are respectively connected with the first driving rod 9; as shown in fig. 4, when the first driving lever 9 moves along the slider moving direction F1, the 1 st left slider PP1 and the 1 st right slider P1 move simultaneously along the direction F1, so as to drive the 2 nd bottom roller left and right roller bases (T2/TT 2) and the 3 rd bottom roller left and right roller bases (T3/TT 3) connected with the 1 st left and right slider (P1/PP 1) to move together along the direction F1; since the 2 nd bottom roller R2 and the 3 rd bottom roller are positioned in the roller stands (T2, TT2, T3, TT 3) and move together with the roller stands (T2, TT2, T3, TT 3), the 2 nd bottom roller R2 and the 3 rd bottom roller R3 move relative to the 1 st bottom roller R1, and the main drafting roller gauge L1 is changed. When the first lever 9 moves in the direction of approaching the 1 st bottom roller R1 along F1, the main draft roller gauge L1 decreases; when the first lever 9 moves in the direction F1 away from the 1 st bottom roller R1, the main draft roller gauge L1 increases. Therefore, the moving direction and the moving amount of the first lever 9 determine the increase or decrease and the value of the increase or decrease of the main draft roller gauge L1.

Further, the first control rod 9 is connected with a first screw 10. The first screw 10 is connected to a pulley 11. The first screw pulley 11 is connected to a pulley 12 of a first motor 14 via a belt 13. The first motor 14 has a control system 15. The control system 15 can be part of the control system of the draw frame D or the combing machine E or can be a separate control system.

The first motor 14 rotates in a motor rotation direction F3, thereby driving the first motor pulley 12 in rotation; the belt 13 is moved in the direction F4 to rotate the first screw pulley 11, thereby rotating the first screw 10. The rotation of the first screw 10 drives the first driving rod 9 to move along the direction F1; further, the 2 nd bottom roller R2 and the 3 rd bottom roller R3 keep the relative position unchanged, and the position changes relative to the 1 st bottom roller R1, thereby realizing the increase or decrease of the main drafting roller gauge L1. In this embodiment, the first motor 14 is a high-precision servo motor; the first screw 10 is a screw with a radial movement precision of 0.1 mm; thus, the rotation direction and the number of rotations of the first motor 14 can be precisely controlled, thereby precisely controlling the moving direction and the moving amount of the first screw 10. In this embodiment, a minimum of 0.1mm of radial movement is achievable. Generally, the adjustment range of the main draft roller gauge L1 is not limited. However, considering that the bottom rollers (R1, R2 and R3) have reasonable radius requirements, in general: in the present embodiment, a preferable range of the main draft roller gauge L1 is: 30.0 mm-120.0 mm. In this embodiment, the radius of the 1 st bottom roller R1 is 20.0mm, and the radii of the 2 nd bottom roller R2 and the 3 rd bottom roller R3 are 15.0mm, so that the theoretical minimum value of the main draft roller gauge is 35.0mm in this embodiment (i.e., the distance between the 1 st bottom roller R1 and the 2 nd bottom roller R2 is close to 0 mm). The trend of miniaturization of the radius of the 1 st, 2 nd and 3 rd bottom rollers (R1, R2 and R3) in a new drafting system is not excluded, and the adjusting range of the main drafting roller gauge L1 is correspondingly increased and generally does not exceed the area of 5.0mm-120 mm.

The control system 15 controls the rotation direction and the rotation number of the first motor 14, so that the main draft roller gauge L1 can be automatically set.

The control system 15 is provided with a human-computer interaction interface, compares the current gauge value of the main drafting roller according to the target value of the gauge L1 of the main drafting roller input by the human-computer interface, and calculates the variation of the gauge L1 of the main drafting roller which needs to be increased or decreased. The variation is converted into the rotation direction and the number of rotations of the first motor 14, thereby realizing accurate control of the main draft roller gauge L1.

Further, as an intelligent optimization method, the control system 15 inputs the information of the fiber strips 3 according to the human-computer interface. The information of the fiber strips comprises the weight of the fiber strips, the blending ratio of the fiber strips, the types of fiber raw materials, the length of fibers and the like. The control system 15 recommends the main draft roller gauge value L1 to be adjusted based on the sliver information of the sliver 3. By this method, automatic optimization and recommendation of the proper main drafting roller gauge L1 are realized.

FIG. 5 is a schematic side view of the automatic adjusting device for the gauge of the main draft rollers of the drawing frame and the combing machine (the 4 th belt roller of the draft system of the drawing frame is not shown). A typical drafting system can be clearly seen here. A 1 st leather roller C1 and a 1 st bottom roller R1, a 2 nd leather roller C2 and a 2 nd bottom roller R2, a 3 rd leather roller C3 and a 3 rd bottom roller R3 respectively form a drafting roller pair; the fiber sliver is drawn in the direction of F5. The control system 15 commands the rotation direction and the rotation number of the first motor 14, so as to precisely control the rotation direction and the rotation number of the first screw 10, and further control the moving direction and the moving amount of the first driving rod 9; the first driving rod 9 controls the moving direction and the moving amount of the 1 st left and right slide block (P1/PP 1), thereby realizing the setting of the accurate value of the main drafting roller gauge L1. The accurate value can reach the accuracy of 0.1mm according to the accuracy of the first motor 14 and the first screw 10, thereby improving the set accuracy grade of the roller gauge.

Fig. 6 and 7 show the principle of how the back roller gauge L2 of the draw frame D and the combing machine E can be adjusted on the same principle.

As shown in the figure, FIG. 6 is a schematic top view of the automatic adjusting device for the gauge of the drafting rollers at the back area of the drawing frame and the combing machine. FIG. 7 is a schematic side view of the automatic adjusting device for the gauge of the draft rollers in the back area of the drawing frame and the combing machine.

As shown in fig. 6, the distance L2 between the shaft center line S2 of the 2 nd bottom roller R2 and the shaft center line S3 of the 3 rd bottom roller R3 is the back draft roller gauge. During the adjustment of the automatic back zone draft roller gauge L2, the position of the 2 nd bottom roller R2 relative to the 1 st bottom roller R1 is kept unchanged, thereby ensuring that the distance of the main draft roller gauge L1 is kept unchanged. The 3 rd bottom roller R3 is moved relative to the 2 nd bottom roller R2 to change the position of the 3 rd bottom roller R3, thereby changing the value of the back zone draft roller gauge L2.

The method for moving the 3 rd bottom roller R3 is as follows: the 3 rd bottom roller is seated on the 3 rd bottom roller right seat T3 and the 3 rd bottom roller R3 left seat TT3, respectively, and the 3 rd bottom roller R3 moves with the movement of the left and right seats (T3, TT 3). The 2 nd right slide block P2 is connected with the 3 rd bottom roller right base T3, and the 2 nd left slide block PP2 is connected with the 3 rd bottom roller left base TT 3; the second drive lever 16 is connected to a 2 nd right slide P2 and a 2 nd left slide PP2. When the 2 nd right slide block P2 and the 2 nd left slide block PP2 move along the direction F1, the position of the 3 rd bottom roller R3 relative to the 2 nd bottom roller R2 is driven to change, and the numerical value of the back zone roller draft roller gauge L2 is further changed.

Further, the second driving rod 16 is sleeved on the second screw 17. The second screw 17 is connected to a second screw pulley 18. The second motor 21 is connected to the second motor pulley 19. The second screw pulley 18 and the second motor pulley 19 are connected by a second belt 20. When the second motor 19 rotates in the direction F3, the belt 20 rotates the second screw 17 in the direction F2, which drives the second driving rod 16 to move. As described above, the movement of the second driving lever 16 causes the position of the 3 rd bottom roller R3 to change relative to the 2 nd bottom roller R2, thereby achieving the purpose of adjusting the back draft roller gauge L2.

Further, the control system 15 is connected to the second motor 21 to precisely control and command the rotation direction and number of rotations of the second motor 21, and thus to precisely control the movement of the 3 rd bottom roller R3 with respect to the 2 nd bottom roller R2 under the action of the second driving lever 16 and the 2 nd right slider P2 and the 2 nd left slider PP2. In the present embodiment, the second motor 21 is a high-precision servo motor; the second screw 16 is a screw with the radial movement precision of 0.1 mm; thus, the rotation direction and the number of rotations of the second motor 21 can be precisely controlled, thereby precisely controlling the moving direction and the moving amount of the second screw 16. In this embodiment, a minimum of 0.1mm of radial movement is achievable.

It is known that the adjustment range of the back draft roller gauge L2 is not limited. However, considering that the bottom rollers (R1, R2 and R3) have reasonable radius requirements, in general: in the present embodiment, a preferable range of the back draft roller gauge L2 is: 30.0 mm-120.0 mm. In this embodiment, the radius of the 1 st bottom roller R1 is 20.0mm, and the radii of the 2 nd bottom roller R2 and the 3 rd bottom roller R3 are 15.0mm, so that the theoretical minimum value of the back draft roller gauge in this embodiment is 30.0mm (i.e., the distance between the 2 nd bottom roller R2 and the 3 rd bottom roller R3 is nearly 0 mm). The trend of miniaturization of the radius of the 1 st, 2 nd and 3 rd bottom rollers (R1, R2 and R3) in a new drafting system is not excluded, and the adjusting range of the back zone drafting roller gauge L1 is correspondingly increased and generally does not exceed the area of 5.0mm-120 mm.

The control system 15 controls the rotation direction and the rotation number of the second motor 21, so that the back zone draft roller gauge L2 can be automatically set.

The control system 15 compares the current back zone draft roller gauge value according to the target value of the back zone draft roller gauge L2 input from the human-computer interface, thereby calculating the variation of the back zone draft roller gauge L2 that needs to be increased or decreased. The variation is converted into the rotation direction and the number of rotations of the second motor 21, thereby realizing the precise control of the back zone draft roller gauge L2.

Further, as an intelligent optimization method, the control system 15 inputs the information of the fiber strips 3 according to the human-computer interface. The information of the fiber strips comprises the weight of the fiber strips, the blending ratio of the fiber strips, the types of fiber raw materials, the length of fibers and the like. The control system 15 recommends the back draft roller gauge value L2 to be adjusted based on the sliver information of the sliver 3. In this way, automatic optimization and recommendation of the appropriate back zone draft roller gauge L2 are achieved.

FIG. 7 is a schematic side view of the automatic adjusting device for the gauge of the draft rollers in the back area of the drawing frame and the combing machine, which further clearly describes the direct relationship of the components. The 1 st leather roller C1 and the 1 st bottom roller R1 form a roller pair; the 2 nd leather roller C2 and the 2 nd bottom roller R2 form a roller pair; the 3 rd leather roller C3 and the 3 rd bottom roller R3 form a roller pair. This is a typical three-up, three-down draft system. For the drawing frame, there is generally additionally a deflecting roller, which is not shown in the present exemplary embodiment for the sake of simplicity. However, the description of the present embodiment does not affect the description of the method and principle of automatic roller adjustment of the drafting system of the drawing frame. The control system 15 precisely controls the rotation direction and the number of rotations of the second motor 21. The second motor 21 controls the movement of the second drive rod 16 through the second motor pulley 19, the pulley 18 of the second screw 17 and the second belt 20. The second driving rod 16 controls the movement of the 3 rd bottom roller R3 through the 2 nd right slide block and the 2 nd left slide block, thereby realizing the adjustment of the back zone drafting roller gauge L2.

Example 2.

Fig. 8 and 9 are another embodiment of the present invention: an automatic adjusting device for the gauge of the drafting roller of a carding machine with an integrated drawing frame. FIG. 8 is a schematic top view of an automatic draft roller gauge adjusting device of a carding machine with an integrated drawing frame. FIG. 9 is a schematic side view of an automatic draft roller gauge adjusting device of a carding machine with an integrated drawing frame.

A drafting device for a carding machine with an integrated drawing frame, differing from the drawing frame and combing machine according to the first embodiment of the invention, which has only one drafting zone with a roller pair consisting of the 1 st belt roller C1 and the 1 st bottom roller R1 and a roller pair consisting of the 2 nd belt roller C2 and the 2 nd bottom roller R2. It can be considered that it is similar to the method and principle of adjusting the gauge of a main (back zone) draft roller as in embodiment 1 of the present invention.

The control system 15 precisely controls the rotation direction and the number of rotations of the motor 26. In the present embodiment, the motor 26 is a high precision servo motor. The motor 26 precisely controls the rotation direction and the number of rotations of the screw 27 by means of the motor pulley 24, the screw 27 pulley 23, and the belt 25. The driving rod 22 sleeved on the screw 27 is connected with the right slide block P3 and the left slide block PP3. Screw 27 actuates the movement of drive rod 22; the driving rod 22 drives the right slider P3 and the left slider PP3 to move simultaneously, thereby moving the left base TT2 and the right base T2 of the 2 nd bottom roller R2. Further, the left and right roller stands (T2, TT 2) on the 2 nd bottom roller are moved along with the movement, so that the position of the 2 nd bottom roller R2 relative to the 1 st bottom roller R1 is changed, and the main drafting roller gauge L1 (namely the drafting roller gauge L1 of the embodiment) is adjusted

Example 3.

In the actual production of carding machines, combing machines and drawing frames, the method for setting the roller gauge is as follows: the operator or technician firstly adjusts the roller gauge of the drafting system manually on the drafting system according to the information of the fiber strips such as the raw material type of the used fiber, the length of the fiber and the blending ratio of each fiber and the personal experience value or the process recommendation table or the calculated roller gauge value, and the setting of the roller gauge is realized by using gauge pieces or adjusting tools, scales and the like. The device for automatically adjusting the gauge of the roller is very easy to realize that the gauge of the roller is directly adjusted by a human-computer interface. The specific implementation flow is shown in fig. 10.

First, the technician or operator inputs sliver information via the "human-machine interface" of the control system of the carding, combing or drawing machine. The human-computer interface is a human-computer interaction interface, and is not limited to interfaces such as a keyboard, a touch screen, a USB (universal serial bus), a mobile phone and the like. The control system can be a PLC, and can also be a CPU part of a motor control system. The fiber strip information refers to one or more indexes of fiber strip raw material types, fiber lengths, fiber fineness and the like of the fiber strips.

The control system inputs the fiber strip information according to a human-computer interface, calls the fiber strip information from a database or according to an empirical algorithm, and recommends a main drafting roller gauge by the control system and a back zone drafting roller gauge by the control system; further, the control system compares the recommended main drafting roller gauge with the value of the main drafting roller gauge on the current equipment, calculates the value of the recommended main drafting roller gauge relative to the value of the main drafting roller gauge on the current equipment, needs to increase or decrease the current value of the main drafting roller gauge, and then instructs the motor to rotate forward or backward so as to achieve the recommended main drafting roller gauge, accurately turns and rotates at the same speed, drives the sliding block to move by means of the screw and the control rod, so that the position change of the 2 nd bottom roller relative to the 1 st bottom roller is completed, and the automatic adjustment of the main drafting roller gauge is completed.

In the same working principle, the control system compares the recommended back zone drafting roller gauge with the value of the back zone drafting roller gauge on the current equipment to calculate the back zone drafting roller gauge value on the current equipment, and needs to increase or decrease the current back zone drafting roller gauge value, and then the control system instructs the motor to rotate forward or backward so as to achieve the recommended back zone drafting roller gauge, the motor turns and rotates at a revolution precisely, and drives the slide block to move by means of the screw rod and the control rod, so that the position change of the 3 rd bottom roller relative to the 2 nd bottom roller is completed, and the automatic regulation of the back zone drafting roller gauge is completed.

The current main drafting roller gauge value and the current back zone drafting roller gauge value refer to the following values: and (3) setting the main drafting and back zone drafting roller gauge values at the last time before the adjustment of the roller gauge at the current time. If the equipment adjusts the roller gauge value for the first time, the current main drafting roller gauge value and the current rear zone drafting roller gauge value refer to initial set values when the equipment leaves a factory.

It should be noted that: since carding machines with integrated drawing frames generally have only one drafting zone, the process of the back drafting roller gauge does not need to be recommended in the process described in fig. 10.

Example 4.

Fig. 11 is another embodiment of the present invention. The difference with respect to example 3 is: the main drafting and back zone drafting roller gauge values are directly input by an operator or a technician on a man-machine interface, and are not recommended by a control system according to the information of the fiber strips. This method is suitable for the technicians in experienced textile mills, a faster method of automatically adjusting the roller gauge, relative to the flow of fig. 10 of example 3.

Firstly, a main drafting and back zone drafting roller gauge value is directly input on a human-computer interface, a control system compares the input main drafting roller gauge with the current value of the main drafting roller gauge, and then the required increase or decrease of the current value of the main drafting roller gauge is calculated, so that a motor is instructed to rotate forwards or backwards, the main drafting roller gauge is set, and the automatic adjustment of the main drafting roller gauge is finished.

The same method comprises the following steps: the control system compares the input back zone drafting roller gauge with the value of the current back zone drafting roller gauge to calculate the need of increasing or decreasing the current back zone drafting roller gauge value, thereby instructing the motor to rotate clockwise or anticlockwise so as to set the back zone drafting roller gauge and finishing the automatic regulation of the back zone drafting roller gauge.

Example 5.

As shown in fig. 12, this embodiment proposes a fully intelligent method for automatically optimizing the gauge of the draft rollers, which is a flow chart of a method for automatically optimizing the gauge of the draft rollers based on information of fiber slivers.

First, the "human-machine interface inputs the information on the fiber bar". The fiber strip information refers to one or more indexes of fiber strip raw material types, fiber lengths, fiber fineness and the like of the fiber strips.

Further, "the control system recommends N1, N2, N3 … Nn draft roller gauges". Wherein, N1, N2 and N3 … Nn are recommended values of the gauge values of the main drafting roller and the rear drafting roller which are suitable for the fiber strips. N1 is the recommended value for the first main draft and back draft roller gauge values for the sliver, N2 is the recommended value for the first main draft and back draft roller gauge values for the sliver, and so on. And n in number. As a preferred embodiment of this embodiment, n is generally not more than 3. That is, the control system generally recommends 3 main drafting and back zone drafting roller gauge values.

Further, the control system "compares the recommended draft roller gauge (N1) with the value of the current draft roller gauge" to calculate the need to "increase or decrease the value of the current draft roller gauge", and further "instructs the motor to rotate forward or backward to achieve the recommended draft according to (N1)". Based on the recommended roller gauge value N1, the device (drawing frame, combing machine or carding machine) "produces a section of sliver, and obtains the quality index Q1" of the drafted sliver. Generally, the device (drawing frame, combing machine or carding machine) is provided with a real-time online quality monitoring device for the fiber slivers, so that the control system can also obtain the quality index Q1 of the fiber slivers from the real-time quality monitoring device for the fiber slivers. In this embodiment, the "quality index of the sliver" refers to one or more of indexes such as weight of the sliver, CV% index values (CV%, CV1m%, CV3m%, CV5m%, CV 10%), slubs, details, weight deviation a% of the sliver, and a sliver bopp diagram. The current gauge value of the drafting roller refers to: the last set drafting roller gauge value before the adjustment of the roller gauge of the current time. If the equipment adjusts the roller gauge value for the first time, the current drafting roller gauge value refers to the initial set value when leaving the factory.

According to the same method, the control system compares the recommended draft roller gauge (N2) with the value of the current draft roller gauge to calculate the need to "increase or decrease the current draft roller gauge value", and further, the control system instructs the motor to rotate forward or backward to achieve the recommended draft according to (N2) ". Based on the recommended roller gauge value N2, the device (drawing frame, combing machine or carding machine) "produces a section of sliver, and obtains the quality index Q2" of the drafted sliver.

According to the same method, the control system compares the recommended drafting roller gauge (Nn) with the value of the current drafting roller gauge, thereby calculating the need to increase or decrease the current drafting roller gauge value, and further, the control system instructs the motor to rotate forward or backward, thereby achieving the recommended drafting according to (Nn). Based on the recommended roller gauge value Nn, the device (drawing frame, combing machine or carding machine) "produces a section of fiber sliver, and obtains the quality index Qn" of the drafted fiber sliver.

Further, the system is controlled until n (Q1-Qn) quality index values of the drafted fiber sliver are obtained. The control system compares the sliver quality indexes (Q1, Q2, … Qn) to obtain the optimal sliver quality index value (Qx) and the corresponding drafting roller gauge Nx'.

Further, the control system takes the drafting roller gauge Nx as the optimal advancing gauge value of the current raw material and the fiber length, and further instructs the motor to set the optimal roller gauge value Nx.

As a preferred embodiment of the invention, n is typically 3.

The above embodiments are only exemplary embodiments of the present invention, and do not limit the scope of the present invention as defined by the claims. Various modifications and equivalents of the invention which are within the spirit and scope of the invention may occur to those skilled in the art and are not required to be exhaustive of all embodiments, and such modifications and equivalents are intended to be within the scope of the invention.

Claims

1. An adjusting drafting system roller gauge device is used for adjusting the roller gauge (L1, L2) of a drafting system (DF 1, DF2, DF 3) of a spinning device (C, D, E), and comprises a motor (14, 21, 26), a control system (15), a slide block (P1, PP1, P2, PP2, P3, PP 3), a screw (10, 17, 27), a driving rod (9, 16, 22), a roller base (T1, TT1, T2, TT2, T3, TT 3)), at least 2 pairs of rollers consisting of an upper leather roller (C1, C2, C3, C4) and a lower bottom roller (R1, R2, R3); bottom rollers (R1, R2, R3) are mounted on roller bases (T1, TT1, T2, TT2, T3, TT 3); the roller bases (T2, TT2, T3 and TT 3) are connected with the sliding blocks (P1, PP1, P2, PP2, P3 and PP 3); the slide block (P1, PP1, P2, PP2, P3 and PP 3) is connected with the driving rod (9, 16 and 22); the driving rod (9, 16, 22) is connected with the screw rod (10, 17, 27), and is characterized in that: the motor (14, 21, 26) drives the screw (10, 17, 27) to rotate.

2. The device for adjusting the roller gauge of the drafting system as claimed in claim 1, wherein: the screw (10, 17, 27) drives the driving rod (9, 16, 22) to move, and the driving rod (9, 16, 22) drives the bottom rollers (R2, R3) connected with the sliding blocks (P1, PP1, P2, PP2, P3, PP 3) to move.

3. The device for adjusting the roller gauge of the drafting system as claimed in claim 2, wherein: the driving rods (9, 16, 22) are sleeved on the screw rods (10, 17, 27).

4. The device for adjusting the roller gauge of the drafting system as claimed in claim 3, wherein: the packet motors (14, 21, 26) are high-precision servo motors.

5. The device for adjusting the roller gauge of the drafting system as claimed in claim 4, wherein: the screw (10, 17, 27) and the driving rod (9, 16, 22) are of a ball screw structure; and a minimum precision of 0.1mm in relation to the movement of the driving rod (9, 16, 22).

6. The device for adjusting the roller gauge of the drafting system as claimed in claim 5, wherein: the adjustment range of the roller gauge (L1, L2) of the drafting system (DF 1, DF2, DF 3) is: 5.0mm-120 mm.

7. The device for adjusting the roller gauge of the drafting system as claimed in claim 6, wherein: the control system (15) compares the new roller gauge (L1, L2) with the roller gauge (L1, L2) set by the current machine, calculates the required change of the roller gauge (L1, L2), and calculates the steering and the revolution of the motor (14, 21, 26) according to the change.

8. The device for adjusting the roller gauge of the drafting system as claimed in claim 7, wherein: the control system (15) is provided with a human-computer interaction interface.

9. The device for adjusting the roller gauge of the drafting system as claimed in claim 8, wherein: the control system (15) acquires the roller gauge (L1, L2) input from the human-computer interface, or calculates the roller gauge (L1, L2) based on the sliver information input from the human-computer interface.

10. A device for adjusting the roller gauge of a drafting system as claimed in any one of claims 1 to 9, wherein: during setting of the roller gauge of the drafting system (DF 1, DF2, DF 3) of the spinning device (C, D, E), the 1 st bottom roller (R1) keeps the position unchanged, and the 2 nd bottom roller (R2) moves relative to the 1 st bottom roller (R1); the 3 rd bottom roller (R3) moves relative to the 2 nd bottom roller (R2).