FI117105B - Roller drive for moving rollers - Google Patents

Description

Roller drive for moving rollers

BACKGROUND OF THE INVENTION The present invention relates to a roll drive moving rolls comprising a roll combined with a moving structure and a roll; 5 a motor adapted to include a stator and a rotor.

Some of the rolls and access points of paper and other similar machines and paper mills are movable. The movement can be from centimeters up to a few meters. Such rollers include, for example, rolls of an adhesive calender and center rollers. In such objects, the torque produced by the motor p 10 of the roll must be transmitted to the moving roll.

Prior art solutions are based on either a stationary engine and complex mechanics associated therewith, i.e. a conventional engine mounted on a moving part.

The stationary motor can be coupled to a movable roll 15 by means of a long cardan whose pivots allow the roll to move. It can also be used when the motor or other belt retaining e is mounted at the axis of motion. Complex mechanics s the movement of the roll, and transmits the motor torque to the roll from its movement h As a solution, the stationary motor with the force allowing the movement of the roll; 20 expensive and takes up a lot of space. Long cardan shafts and belt straps cause adjustment problems due to the low system rotation characteristic: * ·: frequency. Also, the angular velocity caused by the cardan joints reduces the accuracy of the adjustment. Belt transmission requires maintenance and causes f **: In one solution, a conventional motor can be »tl 25 of its body on a moving part of the machine and the motor shaft on the v. ···. used roller. The motor torque is then transmitted by the switch k; • «" I can be rolled in despite the movement of the roll. This kind of solution: • · ktn significantly increases the mass and space of the moving mechanics as the motor requires a mounting base and the shaft needs a clutch * · * ... 'The conventional nickel clamping 2

BRIEF DESCRIPTION OF THE INVENTION It is an object of the present invention to provide a roller to avoid the aforementioned drawbacks, and to provide a more reliable and simpler apparatus for a moving roller than the prior art by a roll drive according to the invention, characterized in that the roll drive motor is an axial a roll shaft such that the roll axis drives the motor, and that the motor is supported by a support arm from the stator to said structure, and that the roll drive further comprises a frequency converter 10 adapted to drive the axial flow motor mounted to the roll shaft.

The invention is based on the idea that an axial flow motor can be directly connected to the movable bore shaft, whereby no gears or switches are needed between the m rolls and the rotor shaft of the motor directly mounted on the roll axis. When carried out in this way, the movable 15 increases significantly, since the torque obtained from the axial flow motor is significantly greater than that of a conventional short-circuiting motor with corresponding motor cups. In addition, the inventive idea provides for the use of a clutch and a gear, whereby the adjustment can be made more precise by the use of wearing mechanical parts.

20 Brief Description of the Figures. The invention will now be described in more detail with reference to the preferred embodiments, with reference to the accompanying drawings, in which: Figure 1 shows a schematic view of the tel side according to the invention, and Figure 2 shows a perspective view of figure 1.

• «i« «*« V.; DETAILED DESCRIPTION OF THE INVENTION

Fig. 1 shows a roll drive according to the invention ... for rolls in which the roll 1 is attached to a movable track of the roll • · 3 in connection with the center rollers, whereby the diameter of the roll increases with the material to be rolled. As the diameter increases, the amount of roll in certain applications corresponds to the increase in diameter.

The motor of the roll drive according to the invention is an axial flow 5 whose rotor shaft 5 is directly connected to the roll axis 4 so that the shaft 2 carries the motor 2. The axial flow motor is a motor, a jor and a stator made of disk-like discs coated with electromotive force generating elements. Typically, the stator is provided with coils capable of being magnetized by an electric current, which is mag 10 desired by using, for example, a frequency converter.

According to a preferred embodiment of the invention, the rotor of the axial flow motor 2 is permanently magnetized, whereby the disk-like rotor is suitably coated with pieces of permanent magnet material. The advantages of a permanent magnet rotor are cooling or expansion and the high torque provided by the motor driven axial flow motor thus acts as a synchronous machine which can be used today; utilize the variables to control very precisely. As will be apparent from the figures, the structure of the submersible rotor motor 2 is a generally disc-shaped rotor disc between two stator discs, whereby the main motor flow is formed along 20 axes. The axial flow motor is very well suited for proper use, since the permanent magnets of the rotor are placed on the outside of a typical market place. The distance of the permanent magnets to the rotation axis of the rotor »» i · * 1 is directly related to the magnitude of the torque from the motor. Axial • ♦: however, the rotor on the market need not be ke $ tomagnet (• * 4 25 motor may also comprise a reluctance rotor or a short circuit rotor n.

·: ··! Roller drive according to a preferred embodiment of the invention: ***: The jet motor comprises a hollow rotor shaft 5. The rotor shaft is hollow! The large internal diameter of the hollow rotor shaft is made possible by the engine structure. As a result of the placement of the permanent magnets, the middle part of the 30-earth engine is left unused in the torque generating unit • 4, without any supporting structures directly attached to the roller 1.

Thanks to the mounting method, the motor can also be mounted on sites, ie the axial flow motor can replace the previously used reduction gear and the conventional motor. The motor can be mounted on the wedge shaft in the same way as the current roller to be fastened. The fastening can be performed, for example, by providing a tapered portion at the end of the roll shaft against which the hollow motor rotor reliably lands. The conical portion of the shaft pin head 10 is accomplished, for example, by attaching, for example, a discrete piece to the shaft, or alternatively turning the shaft end to achieve desirability. It is apparent from Figures 1 and 2 that the roll bar is supported by a movable structure 3 which includes roll bearing.

Since the motor is mounted directly on the roll axis by means of an air mounting pin 15, the motor is supported in accordance with the invention with a stator 6 on a movable structure 3. The support is. necessary its flow otherwise the motor stator would rotate in an undesirable manner. Supporting by means of a rigid support arm from the stator of the motor by connecting the support arm to the movable structure 3 with which the motor 2 is intended to be mounted. The support arm must be so strong that, despite its large torques, the engine reliably remains stationary. However, the function of the support arm 6, as has already been shown »> ·· * *, is not supported by the engine. Support arm «4:.! ! the end is fixed to the motor frame and the other end to a movable rack ΦΙΙ 25 such as a roller and motor bearing boom or mu »: · *:.

According to one embodiment of the invention, the axial side comprises water cooling. Water cooling can be accomplished, for example, by installing a spiral water tube on the stator support plate, where · * ·. 30 liquids are recycled. Said disc-like support plate is located; * · 5 better placed in confined spaces. An application where small size disputes are required is, for example, calender use, in which the smaller rollers are located in close proximity or parallel to each other. However, the calendars have m 5 to place the motors alternately on opposite rolls | on adjacent tracks. By doing so, the diameter of the motor may be much larger than the diameter of the roll.

A roll drive is arranged to control the frequency converter or the heaving device by which the rotation speed of the motor 2 and the mom 10 it produces are reliably and precisely controlled. For example, a frequency converter with a voltage intermediate circuit is responsible for such a frequency converter. Since, according to one embodiment, the roller shafts are hollow, it is desirable, due to the superiority of the drive, that the drive controlling the drive can provide the desired torque and rotation speed instructions without a direct field of rotation of the roller and motor. For hollow shafts, a tachometer for determining the rotation speed is fitted. The choice of this drive as a frequency converter is, for example, direct torque-based solutions, in which the state of the controlled motor is accurately and reliably based on a model made of the motor, and the installation of about 20 tachometers on a hollow shaft.

It is obvious to a person skilled in the art that as technology advances. This basic idea can be implemented in many different ways. Thus, the invention and its forms are not limited to the examples described above, but are vc within the scope of the claims.

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Claims (5)

Rolling roller rolling operation, which rolling operation comprises a similar structure (3) joined roller (1) and a motor (2) which is similar to the roller, which motor comprises a stator and a rotor, the drum drive is an axial flow motor (2) whose rotor shaft in association with the shaft (1) of the drum (4) so that the shaft of the drum bears up against the motor (2) being supported by a support arm (6) from the stator tili 3), and that the roller operation further comprises a transducer arranged to control the shaft (1) of the roller (1) the flow motor (2). Rolling operation according to claim 1, characterized in that the rotor of the flow motor (2) comprises permanent magnetization. Rolling operation according to claim 1 or 2, characterized in that the rotor of the flow motor (2) comprises a hollow rotor shaft (5). Rolling operation according to claim 1, 2 or 3, characterized by the axial flow motor (2) comprising water cooling. 9 9 9 9 I * * · • * · * * ♦ · 999 9 9 9 9 99ψ 9 9 9 999 9 9 9 f ·· · 9 99 «· ·· 9 9 9 9 9 999 99 9 9 9