JP6337372B2 - Rotating body balance mechanism - Google Patents

Description

  The present invention relates to a balance mechanism for a rotating body.

  A precision instrument balance mechanism, such as a grinder including a rotor, particularly a rotor portion that is rotated at a high angular velocity about an axis, is currently known.

  The balance mechanism is suitable for balancing the rotor portion, that is, for shifting the center of mass of the rotor portion to position the center of mass substantially on the rotation axis. The balancing mechanism should therefore prevent the occurrence of vibrations generated by centrifugal forces in the presence of unbalance of the rotor part, which can lead to damage or undesired effects of the machine containing the rotor part. .

  In particular, if the machine in question is a machine tool, undesired vibrations can lead to inaccurate detection of any contact between the grinder or tool and the part being machined, resulting in machining inaccuracies and further It can lead to other drawbacks.

  The balancing mechanism is disposed within or integral with the rotor portion and is unbalanced equal to zero unbalance or unbalance of the rest of the rotor portion to balance the rotor portion. An offset mass that can be positioned by a driving means such as an electric motor is preferably included at a position where a balance is formed.

  The offset mass is generally substantially cylindrical and the cylindrical axis is the rotational axis of the balancing mechanism so that it can exhibit a zero unbalanced configuration if the rotor portion itself is already balanced. Positioned to match.

  The balancing mechanisms known in the prior art have serious drawbacks.

  The balance mechanism is actually very complex and therefore expensive, and is prone to failure, especially due to the very large centrifugal forces that are formed on each element.

  A further disadvantage is that the balance mechanism is not always accurate enough. For many applications, such as grinders, it is actually required to be very accurate.

  Furthermore, if an acceptable level of accuracy is achieved, this will compromise the maximum balance capability.

  Furthermore, the function of the prior art mechanism is complex and takes a long time to start.

  The technical problem of the present invention in this situation is to devise a rotating body balance mechanism that can substantially overcome the aforementioned drawbacks.

  Another important object of the present invention is to create a simple and robust balance mechanism.

  A further object of the present invention is to obtain a very accurate balance mechanism without the above high balance ability.

  The technical problem and the stated purpose is a balance mechanism suitable for being positioned integrally with a rotating body suitable for being rotated about a rotation axis, which is offset with respect to the main rotation axis A plurality of storage means arranged at a position, at least one element suitable for winding wound around the plurality of storage means, and an element suitable for winding around the storage means And as a result, characterized in that it comprises transport means suitable for changing the dispersion of the mass of at least one element suitable for winding over several of the storage means so as to balance the mass of the rotating body Solved by a balance mechanism.

  Preferred and advantageous solutions are described in the other claims, the description and the drawings.

  The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention with reference to the accompanying drawings.

It is a schematic side view of the 1st example of the balance mechanism by this invention. It is a schematic front view of the 1st example of the balance mechanism by this invention. It is a schematic side view of the 2nd example of the balance mechanism by this invention. It is a schematic front view of the 2nd example of the balance mechanism by this invention.

  Referring to the drawings, reference numeral 1 generally indicates a balance mechanism according to the present invention.

  The balance mechanism is suitable for being positioned integrally with the rotating body 20.

  The rotating body 20 is preferably a tool, more preferably a grindstone, and even more preferably a grinder or a numerically controlled milling machine. The rotary body 20 and the mechanism 1 are therefore part of a machine, preferably a rotor of a machine tool, which is suitable for rotating the rotor about the main rotary axis 20a. The machine is further fitted with a stator that is fixed against rotation of the rotor.

  The balance mechanism 1 is additionally suitable for forming part of a balance device 10 controlled by the machine. In particular, the mechanism 1 constitutes the rotor part of the balance device 10.

  The balance device 10 preferably further includes a fixed portion 11, a control means 12 of the balance device 10, and an unbalance detection means.

  More particularly, the fixed part 11 is suitable for sending signals and power to the mechanism 1, preferably by non-contact coupling such as inductive coupling. An example of such wireless coupling is described in IT-A-MI5090100 issued to the present applicant (page 3, line 23 to page 8, line 10 and FIGS. 1, 3, and FIG. 3). 4).

  The control means 12 is rather appropriately connected to the fixed part 11 via a cable, allowing computer control and user control of the entire balance device 10. User control is known per se.

  The unbalance detection means not shown in the drawings comprises a piezoelectric sensor and a similar mechanism suitable for detecting any vibration caused by the unbalance of the described rotor of the machine. The unbalance detection means is operatively connected to the control means 12 and is preferably European Patent No. 1645362 (paragraphs [0031] to [0082], FIGS. 1 and 5 to 10 issued to the applicant). ).

  The balance mechanism 1 is suitable for constituting the rotation axis of the mechanism 1, and thus includes a main axis that coincides with the main rotation axis 20 a of the rotating body 20.

  The mechanism 1 is briefly: a plurality of storage means 2 arranged at an offset position with respect to the main rotating shaft 20a, suitable for winding, wound around corresponding to several storage means 2 It further comprises at least one element 3 and transport means 4 suitable for winding the element 3 suitable for winding around the storage means 2.

  As a result, the transfer means 4 are suitable for changing the mass distribution of the elements 3 suitable for winding over several storage means 2. By changing the dispersion of the mass, the center of mass of the mechanism 1 and the connected rotating body 20 changes. They are therefore suitable for balancing the rotating body 20.

  More particularly, the element 3 suitable for winding is preferably composed of a band (FIGS. 1 and 2) or in the case of a significantly narrower width (FIGS. 3 and 4). The band or wire is preferably made of a metallic material, more preferably steel, preferably harmonic steel or the like. In particular, the band preferably has a width of 0.5 cm to 2 cm and a thickness of 0.1 mm to 0.01 mm. Rather, the wire has a diameter that is approximately tenths of a millimeter in size. In particular, the mass per unit length of the band is between 1 g / m and 20 g / m, while in particular the mass per unit length of the wire is between 0.05 g / m and 1 g / m.

  Alternatively, the element 3 suitable for winding may include a mass positioned equidistantly.

  The elements 3 suitable for winding and the transfer means 4 are preferably paired, in particular, each transfer means 4 is arranged corresponding to the storage means 2, and more suitably each storage means 2 is a transfer means. 4 are arranged in correspondence with 4.

  The transfer means 4 is preferably an electric rotary motor in the mechanism 1 or alternatively a sliding block or bearing that allows the winding of the element 3 to be controlled externally. These are suitable for pulling and winding the element 3. In one alternative, the transfer means 4 are suitable for compressing and unwinding the element 3 as a result of including a very precise guide, especially when the element 3 is compressed and not crushed. If a very accurate guide is included, a single transport means 4 can be controlled by a pair of storage means 2.

  The storage means 2 is essentially a storage reel of bands or wires or similar elements. The storage means 2 has a suitable width of 0.5 cm to 3 cm and a lateral flange suitable for receiving and guiding the element 3 suitable for winding. The storage means 2 are in an offset position, i.e. each of the storage means 2 individually has a center of mass that does not coincide with the shaft 20a to maintain balance. The storage means 2 is preferably four in number, and is substantially arranged with respect to the axis 20a in a plane perpendicular to the axis 20a at right angles according to rotational symmetry. Thanks to such an arrangement, the storage means can balance any unbalance in the plane of the rotating body 20 and achieve a simple construction of the mechanism 1.

  There are six storage means 2 in terms of number, and the storage means 2 can be preferably arranged in a plane perpendicular to the axis 20a with respect to the axis 20a according to rotational symmetry at an angle of 60 °. Thanks to such an arrangement, the storage means can balance any unbalance in the plane of the rotator 20 and achieve a more sophisticated balance means suitable for balancing a larger unbalance.

  Corresponding to the storage means 2, the amount of the element 3 suitable for winding, or the element 3 suitable for winding, by a special marker inserted in the element 3 etc. suitable for winding suitably There may be a sensor suitable for measuring the proximity of the end of the.

  The mechanism 1 further includes a housing 5 suitable for housing the elements constituting the mechanism 1. The container 5 is suitably cylindrical (FIG. 4) or ring (FIG. 2), and in the case of a ring, can be positioned across the rotating shaft that supports the rotating body 20.

  Inside the housing 5 there is also preferably a guide 6 of the element 3 suitable for winding. The guide 6 can be composed of a hollow part inside the housing 5 or can further be composed of various guide elements such as rollers, columns and the like. The guide 6 designs a track that allows the elements 3 suitable for winding to not interfere with each other. If the element 3 particularly suitable for winding is a band, the guide 6 designs a track that does not intersect in a plane perpendicular to the main axis 1a outside the storage means 2, as shown in FIG.

  Conversely, elements 3 suitable for winding composed of wires can intersect in a plane perpendicular to the main axis 1a, as shown in FIG. 4, assuming their thickness is small. it can. If the element 3 is a wire and the container 5 does not have a shaft cavity, there can be no guide 6 (FIG. 4).

  The mechanism 1 further comprises receiving means 7 suitable for being coupled to send data and power to the described fixed part 11 of the balance device 10. The receiving means 7 therefore preferably comprises non-contact inductive coupling means and the like.

  The mechanism 1 is finally provided with a control means 8 built in the mechanism 1 composed of electronic components suitable for performing control and commands of the mechanism 1.

  The function of the balance mechanism 1 described above in terms of structure is as follows.

  When the machine is activated, the rotor is rotated and a balance device 10 comprising a balance mechanism 1 connected to the rotor is attached.

  The imbalance detection means detects any imbalance and transmits information to the control means 12, which transmits information to the fixed part 11, which then receives the information without contact with the receiving means 7. Then, the data is transmitted from the receiving means 7 to the control means 8 built in the mechanism 1.

  Such a mechanism activates the rotation of the transfer means 4 which, by winding and unwinding, carries the elements suitable for winding between the various storage means 2 and consequently any imbalance. Disperse the mass to balance.

  The balance mechanism 1 according to the invention achieves several important advantages.

  In practice, the balance mechanism 1 is very accurate. Specifically, in consideration of the fact that the motor constituting the transfer means 4 can be controlled by a slight rotation, and the described dimensions of the storage means 2 and the described mass per unit of length of the element 3, The change in mass can be as much as one hundredth of a gram.

  Mechanism 1 further achieves a high maximum balance capability; thus, it is suitable for balancing large size unbalances.

  The mechanism 1 additionally has a very simple structure compared to the known balance mechanism. The mechanism is therefore economical and not prone to failure.

  Changes and modifications may be made to the invention described herein without departing from the scope of the inventive concept. Equivalent elements may be used in place of all details, and the scope of the invention includes all other materials, shapes and dimensions.

Claims (11)

  A balance mechanism (1) suitable for being positioned integrally with a rotating body (20) suitable for being rotated around a rotating shaft (20a), with respect to the main rotating shaft (20a): A plurality of storage means (2) disposed at offset positions, at least one element (3) suitable for winding, wound around corresponding to the plurality of storage means (2), the storage means Suitable for the winding over several of the storage means (2) so as to wind an element suitable for the winding around (2) and consequently balance the mass of the rotating body (20) Balance mechanism, characterized in that it comprises transfer means (4) suitable for changing the mass distribution of the at least one element (3).   Balance mechanism (1), wherein said transfer means (4) is a rotary motor, each of said transfer means (4) being arranged corresponding to one of said storage means (2). Item 2. The balance mechanism according to Item 1.   Balance mechanism (1) according to claim 1 or 2, wherein each of said storage means (2) is arranged corresponding to one of said transfer means (4).   The balance mechanism (1), wherein the element (3) suitable for winding is wound corresponding to two of the storage means (2). The balance mechanism according to item.   In the balance mechanism (1), the number of the storage means (2) is four in number, and with respect to the axis (20a), a plane perpendicular to the axis (20a) is perpendicular to the rotational symmetry. The balance mechanism according to any one of claims 1 to 4, which is arranged.   The balance mechanism (1) has six storage means (2) in terms of number, and is at an angle of 60 ° with respect to the axis (20a) in a plane perpendicular to the axis (20a). The balance mechanism according to any one of claims 1 to 5, which is arranged according to rotational symmetry.   The balance mechanism (1) according to any one of claims 1 to 6, wherein the element (3) suitable for winding is a metal band.   The balancing mechanism (1) according to claim 7, wherein the element (3) suitable for winding is a metal wire.   The balance mechanism (1) according to any one of claims 1 to 8, comprising a cylindrical housing (5) suitable for constituting an outer casing of the balance mechanism.   The balance mechanism according to claim 9, wherein the balance mechanism (1) is hollow.   A balancing device (10), the balancing mechanism (1) according to any one of claims 1 to 10, a fixed part (11) suitable for sending signals and power to the balancing mechanism (1), A balance device comprising control means (12) of the balance device (10) and unbalance detection means.