CN101318599B - Yarn guiding mechanism on textile machines - Google Patents

Abstract

The invention discloses a device for reciprocating yarn on a textile machine. Specifically, the invention relates to a device for reciprocating yarn. The yarn is wound on a bobbin installed in the winding mechanism of the operating unit of the textile machine Above, the device includes: a longitudinal reciprocating rod (2) shared by a row of operating units, the reciprocating rod (2) is connected with a driver that makes it produce a linear return, and is connected with a drive that determines the dead point of the reciprocating rod (2). The control system (5) of the course position is connected while the longitudinal reciprocating rod (2) is parallel to the longitudinal winding axis assigned to a row of operating units. At the same time, two pairs of magnets (21, 121; 22, 131) are installed at intervals on the reciprocating rod (2) and the machine frame (1), wherein each pair of magnets includes a static magnet (121, 131) and a moving magnet. The magnets (21, 22), and the magnets of the magnet pair are arranged opposite each other with the same polarity, wherein the static magnets are mounted on the machine frame and the moving magnets are mounted on the reciprocating rod.

Description

A device for reciprocating yarn on a textile machine

technical field

A device for reciprocating yarn (yarn traversing), the yarn is wound on a bobbin installed in the winding mechanism of the operating unit of the textile machine, the device includes: a longitudinal reciprocating rod shared by a row of operating units, the reciprocating The rod is coupled to a drive that produces a linear reverse motion and to a control system that determines the course of the up and down travel of the reciprocating rod, while the longitudinal reciprocating rod is parallel to the longitudinal winding axis assigned to a row of operating units. the

Background technique

Yarn reciprocation during bobbin winding of a textile machine such as an air spinning machine, winding machine or two-for-one twisting machine is usually performed by means of a continuous reciprocating rod advancing along one side of the machine operating unit. In the case of a large number of operating units arranged in a row, the reciprocating rods are, for example, 30 meters long and therefore have a considerable weight. the

During the winding process, the cross-winding bobbin, cylindrical bobbin or conical bobbin rotates and its surface is wound on a take-up roller whose axis of rotation is parallel to the axis of the reciprocating rod and which According to the winding of the bobbin, it makes a linear return, and its lifting stroke corresponds to the linear length of the reel cylindrical package (reel cylindrical package) of the wound bobbin. For reasons of machine productivity, the speed at which the yarn is delivered to the wound bobbins is high, which requires that the linear return of the reciprocating rod also have a high frequency. the

From the point of view of forming a cheese package, if the path of the reciprocating rod has a zigzag shape, so that the speed of the reciprocating rod is constant and quickly turns to the same speed in the opposite direction at the dead point position, then this will is the required situation. the

In practice, this is not ideal, especially because of the large inertial mass of the reciprocating rod. The deceleration and acceleration of the reciprocating rod is limited at the dead point where the change of direction of velocity lasts for a necessarily required time interval. During this time interval, the helix according to which the yarn is deposited on the bobbin surface has a rise not that which forms the desired cheese package, but which reduces itself to zero at the dead point , and the single strands of the yarn are deposited overlappingly. Yarn builds up at these points on the bobbin, and the diameter of the package increases faster at this location. the

This phenomenon is prevented by improving the movement of the reciprocating rod in the dead center position. In a common solution, the lifting stroke is kept constant and the positions of the two dead centers move simultaneously in one direction and in the second direction. In a second common solution, the amplitude of the lifting stroke is changed and the positions of the two dead centers are moved in mutually opposite directions, by which the amplitude of the lifting stroke is alternately increased and decreased. From the point of view of package quality, the second solution is more advantageous, however, it is not easy to implement in the case of a drive by a cam mechanism, or a mechanism in which the servo motor does not change the direction of rotation. the

When the reciprocating rod moves at a constant speed, the power required by its drive mechanism is relatively small, because the required power is only used to overcome the passive resistance and deflect the yarn. At the dead point, the power of the drive mechanism changes substantially, primarily for retraction and thus imparts inertial energy to the mass of the reciprocating rod. This can be solved by the large rated drive torque of the electric motor, and/or by generating kinetic energy accumulation by braking the inertial mass of the reciprocating rod before the dead point, and repeatedly releasing the accumulated energy when starting the operation of the reciprocating rod after the dead point . The energy of the reciprocating rod is usually accumulated as the rotational energy of the drive mechanism, however, if the drive mechanism is used for the servo motor to implement the return, conversely, it is also necessary to brake the inertial mass or moment of inertia of the drive mechanism and then make the drive mechanism Acceleration, and the drive torque or power of the servo motor must be high. Servomotors with high drive torques have huge moments of inertia, which increase the total amount of moving mass that is reduced, and thus little or no gain in reciprocating rod acceleration is achievable. the

In addition to guaranteeing the desired shape of the package boundary on the bobbin, an additional problem is the increase in the diameter of the wound bobbin, due to which the individual strands of the yarn laid by strands are alternately approached and separated The axial position changes gradually. This periodically forms annular zones which disturb the shape of the package and complicate the winding process. This situation can be prevented by gradually changing the frequency of movement of the reciprocating rod based on a specific adjustment. the

Existing solutions for reciprocating rod drives typically use cam mechanisms. A mechanism with a constant lift stroke assures a substantially saw-like lift stroke of the reciprocating rod, including speed changes at the dead center. The second superimposed mechanism can realize the slow parallel movement of the dead point. Both mechanisms are loaded with the resultant force necessary to cause the reciprocating rod to move. Disturbance of the endless belt is accomplished either by a controlled variator, usually controlled by an additional cam mechanism, or by incorporating a frequency converter in the supply circuit of the drive motor. The transmission case containing these mechanisms is located on only one side of the machine, making the long reciprocating rod sensitive to the development of vibrations. Along the reciprocating rod there is not only the propagation of longitudinal waves of deformation, but also the propagation of transverse waves as the reciprocating rod experiences bending and swaying in the guide bearings. In addition, rocking also leads to increased friction. The speed of the transverse wave on the reciprocating rod is less than that of the longitudinal wave, and the oscillation of the reciprocating rod is usually very complicated. Therefore, the movement of the free end of the reciprocating rod is different from the movement of its connection with the drive mechanism. the

It is obvious that the main reason for limiting the reciprocating speed and complicating the driving mechanism of the reciprocating rod is the inertial force caused by the large deceleration and acceleration effects of the moving mass near the dead center, which are not fully compensated. the

In order to absorb the energy of the moving inertial mass and subsequently utilize it, some devices based on the prior art use springs. It is advantageous if such a spring has a non-linear characteristic that better corresponds to the force necessary to achieve the desired movement of the reciprocating rod. It is difficult to guarantee this characteristic on mechanical springs or gas springs. In some cases where the cam mechanism is unloaded, a rubber or plastic bumper is used to act on the reciprocating rod near dead center. These springs cause shock and vibration to the reciprocating rod, and they also have a short service life. the

In addition, most of these devices are unable to adjust the lifting stroke of the reciprocating rod and thereby change the width of the package on the bobbin. The reciprocating rods are often subjected to enormous stresses, necessitating a corresponding increase in cross-section, which in turn leads to an increase in the weight of the distributing rod and thus increases the undesired inertial forces. Even in the case of a reciprocating rod with a rather large cross-section, the oscillations often lead to different courses of the lifting and lowering strokes of the reciprocating rod at different positions of the machine. the

The object of the invention is to eliminate or at least substantially reduce the disadvantages of the prior art. the

Contents of the invention

The yarn reciprocating device wound on the bobbin installed in the winding mechanism of the operating unit of the textile machine, the principle is that two pairs of magnets are installed on the reciprocating rod and the machine frame at intervals, each pair of magnets Each includes a static magnet and a moving magnet, and the magnets in the magnet pair are arranged opposite to each other with the same polarity, wherein the static magnet is installed on the machine frame, and the moving magnet is installed on the reciprocating rod. the

The advantage is that the rectilinear return of the reciprocating rod is effectively absorbed in the dead point area, the inertial mass energy of the reciprocating rod is accumulated in the stage before the dead point, and the energy is released after the dead point to facilitate the starting operation of the reciprocating rod. the

If a pair of static and moving magnets are used at the end of the reciprocating rod on the machine, the pressure in the reciprocating rod can be significantly reduced or even fully compensated. Thereby it is possible to significantly relieve the load in the reciprocating rod or to replace it with a lightweight component capable of transmitting only tension. This effectively contributes to the reduction of the dynamic load on the drive mechanism. the

It is also possible to use the appropriate shape and arrangement of the static magnet and the moving magnet to select the direction and magnitude of their separation force, so that the drive of the reciprocating mechanism only provides the passive resistance to overcome the entire reciprocating mechanism and the deflection of the yarn in the winding of the bobbin. energy of. the

It is advantageous if each pair of magnets consists of a static magnet adjustably mounted on the machine frame and a moving magnet fixedly mounted on the reciprocating rod. the

By placing the static magnet, the change of the dead point position of the reciprocating rod can be adapted, and the direction and the maximum magnitude of the force acting on the reciprocating rod can be affected. the

If the static magnet is attached to the machine frame in an adjustable manner through a servo motor fixed on the frame, the output of the servo motor is the linear movement of the static magnet along the reciprocating rod, and the output part of the servo motor after this linear movement is completed It is especially advantageous if it is stabilized. the

It is further advantageous if the servomotor of the static magnet is coupled to a control unit which determines the dead center position of the reciprocating rod. the

It is also advantageous if a vibration damper is arranged between the static magnet and the moving magnet. the

The shock absorber prevents possible contact between the magnets, thus it mechanically protects the magnets. It is even more advantageous if a spring element, such as a disc spring, is inserted between the static magnet and e.g. Impact in the reciprocating rod or destruction of the reciprocating rod due to contact of the static magnet with the moving magnet and/or the contact of the static magnet and the moving magnet with the shock absorber. the

In an advantageous arrangement, a reciprocating rod axial position sensor is arranged along the reciprocating rod in its vicinity. the

It is also advantageous if the static magnet is provided with a sensor for the magnitude of the acting separation force. the

The movement of the reciprocating rod can be monitored in a more precise manner by the position sensor of the reciprocating rod and thus act upon a change in the position of the static magnet, which is also facilitated by a value sensor for the separating force. the

If the drive mechanism for the rectilinear return of the reciprocating rod comprises a servo motor controlled by a control unit that determines the dead center position of said reciprocating rod, and at the same time they communicate at least with the axial position sensor of the reciprocating rod and the forces acting in the reciprocating rod This is advantageous if the sensor is coupled with the magnetostatic separation force sensor. the

By transmitting information about the position of the reciprocating rod, the force acting in the reciprocating rod and the separation force of the magnets to the control system of the servomotor of the reciprocating rod drive mechanism, the operation of the mechanism can be advantageously optimized, thereby obtaining a proper adjustment of the reciprocating rod. sports. the

The arrangement of static magnets, moving magnets and reciprocating rods with the mentioned advantages can be applied not only to new reciprocating mechanisms, but also to existing or old reciprocating mechanisms with different reciprocating rod drives. the

The drive mechanism of the reciprocating rod can be performed by a rotary servomotor with the addition of suitable means to transform the rotary motion into a linear motion, or advantageously by a linear servomotor with linear motion. the

Description of drawings

Exemplary embodiments of the present invention are represented in the accompanying drawings, wherein Figure 1 shows a schematic arrangement of reciprocating rod drives using a crank mechanism with concentrically arranged servo motors, Figure 2 is a schematic arrangement of servo motors driving a crank mechanism through gears, And Fig. 3 is a schematic diagram of position adjustment of the static magnet. the

label list

1 rack (of spinning machine)

11 Fixing frame

12 linear servo motor

121 static magnet

1211 sensor (separation force)

13 linear servo motor

131 static magnet

1311 sensor (separation force)

14 Axial position sensor (reciprocating rod)

15 Axial position sensor (reciprocating rod)

2 reciprocating rod

21 moving magnet

22 moving magnet

23 force sensor (in the reciprocating rod)

3 crank mechanism

31 crank

32 connecting rod

33 crankshaft

34 gears

4 drive servo motor

41 Position sensor (drive servo motor)

5 control system

51 control unit

52 Feeder line

53 Feeder line

54 frequency converter

55 Measuring device (of the force acting in the reciprocating rod)

56 Measuring device (value of separation force in magnet)

57 Measuring device (value of separation force in magnet)

6 drive servo motor

Detailed ways

A basic embodiment of the device according to the invention is shown in FIG. 1 . On the frame 1 of the textile machine, a reciprocating rod 2 is installed via a guide device 11 . The reciprocating rod 2 is driven by an eccentric crank mechanism 3 comprising a crank 31 and a connecting rod 32 . The crankshaft 33 is concentrically connected to the output of the drive servo motor 4 equipped with a position sensor 41 . Moving magnets 21 and 22 are fixedly connected to the reciprocating rod 2 . On the frame 1 of the machine are connected linear servomotors 12, 13, with static magnets 121 and 131 connected to their outputs. The reciprocating rod 2 freely passes through the openings on the static magnets 121, 131 and the linear servo motors 12, 13 (possibly on the outside of the linear servo motors 12, 13). The moving magnet 21 and the static magnet 121 form a co-operating couple like the moving magnet 22 and the static magnet 131 . The magnets are mutually distributed (mutuallydistributed), so that the moving magnet 22 is as close as possible to the static magnet 131 at the left limit position of the reciprocating rod 2 shown, while the moving magnet 21 is as far away from the static magnet 121 as possible, and the magnets 21 and 121 The distance between adjacent surfaces corresponds to the lifting stroke of the reciprocating rod 2 . the

The moving magnets 21 , 22 and the static magnets 121 , 131 are oriented such that there is a separation force acting between the cooperating pair of inner magnets 21 , 121 and 22 , 131 . Between the magnets 21, 121 and 22, 131 of each cooperating pair, an unshown safety shock absorber can be arranged, and the length of the shock absorber in the axial direction of the reciprocating rod 2 increases the distance between the cooperating pair of magnets. distance. the

In order to control the reciprocating rod 2 from the frequency of the lifting stroke, the instantaneous amplitude and the angle of the dead point movement of the reciprocating rod in a straight line, a control system 5 is provided for the device, which includes a control unit 51 for the reciprocating movement of the yarn, a linear servo motor 12 , 13 feeder lines 52, 53 and the frequency converter 54 of the drive servomotor 4 of the crank mechanism 3. the

The control unit 51 for the reciprocating movement of the yarn is a part of the not shown spinning machine control system, and the control unit 51 and the spinning machine control system are connected in a bidirectional manner. Also connected to the input of the access control unit 51 is the information output of the position sensor 41 of the driven servomotor 4 of the crank mechanism 3. The output of the control unit 51 is connected to the feed lines 52 , 53 of the linear servomotors 12 , 13 and the inverter 54 of the drive servomotor 4 of the crank mechanism 3 . the

From the output of the spinning machine control system, information about the required parameters of the frequency of the reciprocating rod 2 rectilinear return, the amplitude of the lifting stroke and the position of the dead lines is input to the yarn reciprocating motion control unit 51. The control unit 51 processes the input information output from the spinning machine control system and the information from the position sensor 41 of the servo motor 4, by using these information the control unit 51 controls the operation of the inverter 54, and controls the driving of the servo motor 4 through it. parameters. Thus, the range of lifting stroke, the position of the control unit 51 in the direction of the reciprocating rod 2 and the speed of the reciprocating rod 2 are controlled. The control unit 51 controls the linear servo motors 12 , 13 through the feed lines 52 , 53 , and thereby sets the positions of the static magnets 121 , 131 to correspond to the dead points of the lifting stroke of the reciprocating rod 2 . the

FIG. 3 schematically shows the positions of the static magnets 121 , 131 corresponding to the lifting stroke of the reciprocating rod 2 controlled by the converter 54 . In position A, the static magnets 121 , 131 are stabilized in a basic position relative to the machine frame 1 by the linear servo motors 12 , 13 , which corresponds to the lift Z of the reciprocating rod 2 . In position B, the static magnet 131 is moved to the left by the linear servo motor 13 by a distance X, whereby the lifting stroke Z is unidirectionally increased by the same distance to a value Z1. In position C, the two static magnets 121 , 131 move relative to position A towards the linear servomotors 12 , 13 , whereby the lifting stroke Z increases symmetrically relative to position A by twice the distance X. At position D, the two static magnets 121 , 131 are moved a distance X to the left relative to position A, and the lifting stroke Z is thereby moved a distance X to the left, with no change in value. At the same time, by setting the positions of the static magnets 121, 131, the control unit 51 ensures that the distance between the magnets 21 and 121 or between the magnets 22 and 131 at the dead point is constant no matter how the dead point position of the reciprocating rod 2 changes. Dampers, not shown, possibly located between cooperating pairs of magnets 21 , 121 and/or 22 , 131 , prevent destruction of the magnets in the event of undesired hard contact. the

In an embodiment not shown, a spring element, such as a disk spring, is inserted between the static magnet and e.g. Prevents impact in the reciprocating rod or destruction of the reciprocating rod due to contact of the static and moving magnets and/or contact of the static and moving magnets with the shock absorber. the

Figure 2 shows another exemplary embodiment of the device according to the invention. Arranged on the crankshaft 33 of the crank mechanism 3 is a gear 34 driven by a drive servomotor 6 coupled with a position sensor 41 . A sensor of the force acting in the reciprocating rod 2 is provided at a position close to the crank mechanism 3 on the reciprocating rod 2 . Axial position sensors 14 , 15 of the reciprocating rod 2 are arranged near the path of the reciprocating rod 2 on the machine frame 1 . Magnet separation force sensors 1211 , 1311 are installed on the static magnets 121 , 131 . In contrast to the first exemplary embodiment according to the invention, the control system 5 also comprises a numerical measurement device 55 of the force acting in the reciprocating rod 2 and magnets 21, 121 and 22, 131 of the respective cooperating pairs of magnets Separation force numerical measurement devices 56 and 57 in. the

The purpose of the improved second embodiment according to the invention is to determine much more precisely the position of action of the reciprocating rod 2 by continuously determining the force and position relationship in the mechanism of the reciprocating device, thereby positively influencing the produced yarn The quality of the wire package. the

Obviously, sensing of position or force can be realized in ways not shown here within the scope of the claims of the invention. The function of a position sensor 41 such as a servo motor may be performed by the position sensors 14, 15, or a linear position sensor, not shown, may be used to sense the position of the reciprocating rod 2. the

In an example of an embodiment according to the invention, materials based, for example, on Fe Nd B (iron, neodymium, boron) or Sm Co (samarium, cobalt) are used for permanent magnets, which are characterized by a high coercive Magnetic force and the ability to maintain a constant magnetization. the

From the point of view of reducing the mass, especially of the reciprocating rod 2, permanent magnets arranged in the Halbach field can be used as an advantageous magnetic mechanism. the

Combinations of permanent magnets and electromagnets, and possible control over them, can also be used in cooperating pairs of magnets. the

The sliding linear return of the reciprocating rod 2 can be obtained by, for example, replacing the gear mounted on the output shaft of the drive servo motor with a not shown straight toothed comb (direct toothed comb) coupled with the reciprocating rod 2 Crank 31 and connecting rod 32 of crank mechanism 3. The reciprocating rod 2 may be driven using a screw-nut assembly with a moving ball screw-thread. It is also advantageous to connect the reciprocating rod 2 with a known linear motor. the

Generally, the operation control of the driving servo motor in the dead point region of the reciprocating rod 2 can be adjusted in accordance with the direction of the magnet separation force, thereby minimizing the load on the driving servo motor. Another advantage of the device according to the invention is that a more complex movement of the reciprocating rod 2 can be achieved, when by controlling the drive servomotor with backlash, it is possible to obtain exactly the desired bobbin package course (course). of bobbin package) movement. the

Claims (10)

1. be used for the reciprocating device of yarn, described yarn is wrapped on the bobbin that is installed in the weaving loom operating unit winding mechanism, described device comprises: row's vertical reciprocating lever that operating unit shared, described reciprocating lever with make it to produce the actuator that straight line reverses and connect, and connect with the control system of the lifting traverse route of determining described reciprocating lever, described vertical reciprocating lever is parallel to the vertical roll that is assigned to row's operating unit simultaneously, it is characterized in that, upward apart from one another by ground two pairs of magnets (21,121 are installed at described reciprocating lever (2) and machine frame (1); 22,131), wherein every a pair of magnet includes magnetostatic body (121,131) and moving magnet (21,22), and the magnet of magnet centering is settled by identical polarity mode respect to one another, magnetostatic body (121 wherein, 131) be installed on the machine frame (1), and moving magnet (21,22) is installed on the described reciprocating lever (2).

2. device according to claim 1, it is characterized in that, every a pair of magnet is installed in the described magnetostatic body (121,131) on the machine frame (1) by adjustable ground and the described moving magnet (21,22) that is installed on the described reciprocating lever (2) with fixed form forms.

3. device according to claim 1 and 2, it is characterized in that, described magnetostatic body (121,131) by being fixed on the servomotor torque constant (12 on the described frame (1), 13) be attached on the described machine frame (1) in adjustable mode, and described servomotor torque constant (12,13) output is described magnetostatic body (121,131) along the traveling priority of described reciprocating lever (2), the output block of described servomotor torque constant (12,13) is stablized after described traveling priority is finished.

4. device according to claim 3 is characterized in that, the described servomotor torque constant (12,13) of described magnetostatic body (121,131) links with the control unit (51) of the dead center position of determining described reciprocating lever (2).

5. device according to claim 1 and 2 is characterized in that, is provided with shock absorber between described moving magnet (21,22) and described magnetostatic body (121,131).

6. device according to claim 5, it is characterized in that, at described magnetostatic body (121,131) and servomotor torque constant (12,13) insert spring members between, in case when reaching the limiting force between magnetostatic body and the moving magnet, described spring members makes described magnetostatic body (121,131) can travelling backwards, thereby and can prevent from contacting with moving magnet and/or the impact in the described reciprocating lever (2) or the breaking-up of described reciprocating lever (2) when contacting with described shock absorber with moving magnet of magnetostatic body at magnetostatic body, wherein servomotor torque constant (12,13) output is described magnetostatic body (121,131) along the traveling priority of described reciprocating lever (2), the output block of described servomotor torque constant (12,13) is stablized after described traveling priority is finished.

7. device according to claim 1 and 2 is characterized in that, is provided with in its vicinity the axial location sensor (14,15) of described reciprocating lever (2) along described reciprocating lever (2).

8. device according to claim 1 and 2 is characterized in that, described magnetostatic body (121,131) is provided with separating force sensor (1211,1311).

9. device according to claim 7, it is characterized in that, make the driver train that described reciprocating lever (2) generation straight line reverses comprise the servomotor torque constant (4) of being controlled by the control unit (51) of the dead center position of determining described reciprocating lever (2), simultaneously they at least with the axial location sensor (14 of reciprocating lever, 15), act on sensor (23) and the magnetostatic body (121 of the power in the described reciprocating lever (2), 131) separating force sensor (1211,1311) links.

10. device according to claim 8, it is characterized in that, make the driver train that described reciprocating lever (2) generation straight line reverses comprise the servomotor torque constant (4) of being controlled by the control unit (51) of the dead center position of determining described reciprocating lever (2), simultaneously they at least with the axial location sensor (14 of reciprocating lever, 15), act on sensor (23) and the magnetostatic body (121 of the power in the described reciprocating lever (2), 131) separating force sensor (1211,1311) links.

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