JP2008190571A - Belt drive mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt drive mechanism capable of stably driving a belt over a long period while suppressing the friction vibration. <P>SOLUTION: The belt drive mechanism 110 comprises a pulley 12 rotatably supported, and the belt 13 wound on the pulley 12 for travelling with the rotation of the pulley 12. Herein, a friction adjusting means is provided for adjusting friction force working between the belt 13 and the pulley 12 during the travel of the belt 13. The friction adjusting means consists of auxiliary rolls 14, 15 rotatably supported. The auxiliary rolls 14, 15 energize the surface of the belt 13 so that the cross section of a contact portion of the belt 13 with the pulley 12, perpendicular to the travelling direction, approximates a linear shape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a belt driving device capable of transmitting a driving force via a belt by driving a pulley around which the belt is wound.

  Conventionally, in a belt driving device such as a belt conveyor, there is a problem that frictional vibration (stick slip) at a contact portion between a belt and a pulley causes noise. In view of such a problem, the belt-type transmission device described in Patent Document 1 has a surface layer made of a surfactant on the belt surface facing the pulley. According to this, the static friction coefficient in the contact surface of a belt and a pulley can be reduced. In this case, it becomes possible to suppress the adhesiveness between the pulley and the belt caused by the temperature rise accompanying the belt running, and it is possible to suppress stick slip.

JP 2001-289284 A

  However, since the belt-type transmission device described in Patent Document 1 needs to form a surfactant layer on the belt surface, a new process must be added to the belt manufacturing process, and the belt manufacturing cost is increased. Will increase and become a problem. Further, there is a possibility that the surfactant layer formed on the belt surface may be worn out or peeled off due to long-term use, and there is a possibility that a stable stick-slip suppressing effect cannot be exhibited. In this case, a lot of labor is required for maintenance, such as applying a surfactant to the belt again. On the other hand, there is a demand for a belt driving apparatus that can drive while suppressing stick slip while using an existing belt.

  In view of the above circumstances, an object of the present invention is to provide a belt driving device that can suppress frictional vibration and can be driven stably over a long period of time.

Means and effects for solving the problems

  The present invention relates to a belt drive device that suppresses frictional vibration and can be driven stably over a long period of time. And the belt drive device concerning the present invention has the following some features in order to achieve the above-mentioned object. That is, the belt driving device of the present invention includes the following features alone or in combination as appropriate.

  The first feature of the belt drive device according to the present invention for achieving the above object is that a pulley that is rotatably supported, a belt that is wound around the pulley and travels as the pulley rotates, A friction drive means capable of adjusting a friction force acting between the belt and the pulley during travel of the belt, the friction adjustment means being an auxiliary that is rotatably supported. The auxiliary roll is a roll that urges the surface of the belt so that a cross section perpendicular to a traveling direction in a contact portion of the belt with the pulley approaches a straight line.

According to this configuration, the belt is urged by the auxiliary roll, so that the belt can be brought into close contact with the pulley surface over the entire surface without partially floating from the pulley surface when the belt is driven. . As a result, a substantially uniform frictional force can be exerted over the entire belt surface, so that slippage between the belt and the pulley surface can be suppressed, and frictional vibration between the belt and the pulley surface can be suppressed. Occurrence can be suppressed. By suppressing the frictional vibration, it is possible to suppress the deterioration of the belt, the pulley, etc., so that the belt driving device can be driven stably for a long period of time.
In addition, since the contact area between the pulley surface and the belt increases as compared with the case where no auxiliary roll is provided, the normal drag per unit area received by the belt from the pulley surface decreases, so that the belt acts between the pulley and the pulley. The frictional force per unit area can be reduced. Thereby, it is possible to suppress the frictional vibration generated by the frictional force locally increasing at the contact portion between the belt and the pulley.
Further, it is possible to adjust the friction state between the belt and the pulley during the running of the belt, and it is not necessary to perform special processing on the belt in advance.

  The second feature of the belt driving apparatus according to the present invention is that at least a pair of the auxiliary rolls are provided so as to urge the belt from both sides.

  According to this configuration, since the belt is urged from both sides by the pair of auxiliary rolls, it is possible to make the running direction and the vertical cross-sectional shape closer to a straight line when the belt is running.

  A third feature of the belt drive device according to the present invention is that the auxiliary roll is an end biasing roll that partially biases the vicinity of both ends of the belt in the width direction parallel to the rotation axis of the pulley. And a central portion urging roll that partially urges the central portion in the width direction.

  According to this configuration, it is possible to more reliably press the end in the width direction of the belt that easily floats from the surface of the pulley against the surface of the pulley.

  Moreover, the 4th characteristic in the belt drive device which concerns on this invention is that the rotating shaft of a pair of said auxiliary | assistant roll is not on the same normal line in the said belt.

  According to this configuration, it is possible to adjust the position of one auxiliary roll in the normal direction of the belt independently of the positions of the other auxiliary rolls. As a result, restrictions on the position adjustment of the auxiliary roll are reduced, and the cross-sectional shape perpendicular to the traveling direction at the contact portion of the belt with the pulley can be made closer to a straight line.

  A fifth feature of the belt driving apparatus according to the present invention is that the auxiliary roll is provided so as to sandwich the belt in the thickness direction of the belt with the pulley.

  According to this configuration, it is possible to more reliably suppress the belt from floating from the pulley surface, and it is possible to drive the belt stably with the entire surface of the belt in contact with the pulley surface. Further, since the belt travel path is not shifted due to the urging of the auxiliary roll, the adjustment at the time of attaching the auxiliary roll becomes easy.

  A sixth feature of the belt driving apparatus according to the present invention is that the auxiliary roll biases the surface of the belt using an elastic force of a spring.

  According to this configuration, the auxiliary roll can be pressed against the belt with a simple configuration.

  A seventh feature of the belt driving apparatus according to the present invention is that the belt drive device further includes an attenuator that attenuates vibration of the auxiliary roll in a direction parallel to a direction in which the elastic force of the spring acts.

  According to this configuration, the reaction force (elastic force) of the spring acting on the auxiliary roll fluctuates due to the rotation of the auxiliary roll due to the running of the belt, and even when the auxiliary roll vibrates due to the reaction force, the attenuator vibrates. Absorbed and the amplitude of the auxiliary roll can be reduced. Thereby, it can suppress that the pressing force to a belt reduces, and can exhibit the effect which makes a frictional force uniform.

  An eighth feature of the belt drive device according to the present invention is a belt drive device comprising: a pulley that is rotatably supported; and a belt that is wound around the pulley and travels as the pulley rotates. A friction adjusting means capable of adjusting a friction force acting between the belt and the pulley during travel of the belt, wherein the friction adjusting means includes a surface of the pulley and an upstream of a rotation direction of the pulley. It is a liquid supply apparatus which can supply a liquid to at least any one of the surface of the said belt located in the side which contacts the said pulley.

  According to this configuration, it is possible to reduce the friction coefficient between the belt and the pulley surface by supplying the liquid. In this case, the frictional force acting between the belt and the pulley can be reduced as compared with the case where no liquid is supplied. Thereby, it is possible to suppress the frictional vibration generated by the frictional force locally increasing at the contact portion between the belt and the pulley.

  The ninth feature of the belt driving device according to the present invention is that the belt driving device further comprises position detecting means capable of detecting a positional deviation of the belt in the direction of the rotation axis of the pulley, and the liquid supply device includes the position detecting means. When the detected positional deviation is equal to or greater than a predetermined value, the supply of the liquid is stopped or the liquid supply amount when the positional deviation is smaller than the predetermined value is reduced.

  According to this configuration, when the belt runs meandering by supplying liquid, when the displacement from a predetermined traveling position in a direction parallel to the rotation axis of the pulley reaches a predetermined amount or more, Supply is stopped. Thereby, it is possible to suppress the frictional force between the belt and the pulley from being excessively reduced by supplying the liquid, and to prevent the belt from meandering and traveling.

  The tenth feature of the belt drive device according to the present invention is further provided with a vibration meter installed on the pulley bearing, and the liquid supply device has a vibration measured by the vibration meter of a predetermined value or more. The belt driving device according to claim 6, wherein in the case, the liquid is supplied.

  According to this configuration, the liquid is supplied when the vibration of the pulley bearing exceeds a predetermined value. As a result, the belt driving device can be driven without always supplying liquid, and excessive reduction of the frictional force between the belt and the pulley can be prevented.

  The eleventh feature of the belt drive device according to the present invention is that the belt drive device further includes a noise meter installed in proximity to a contact portion between the belt and the pulley, and the liquid supply device is measured by the noise meter. If the noise is above a predetermined value, the liquid is supplied.

  According to this configuration, the liquid is supplied when the sound emitted from the contact portion between the belt and the pulley is equal to or higher than a predetermined value. As a result, the belt driving device can be driven without constantly supplying liquid, and excessive reduction of the frictional force between the belt and the pulley can be prevented.

  A twelfth feature of the belt driving device according to the present invention is a belt driving device comprising: a pulley that is rotatably supported; and a belt that is wound around the pulley and travels as the pulley rotates. A friction adjusting means capable of adjusting a friction force acting between the belt and the pulley during travel of the belt, the friction adjusting means comprising an auxiliary roll rotatably supported, and the pulley A liquid supply device capable of supplying liquid to at least one of the surface of the belt and the surface of the belt that contacts the pulley on the upstream side in the rotational direction of the pulley, and the auxiliary roll includes: The surface of the belt is urged so that a cross section perpendicular to the running direction at the contact portion of the belt with the pulley approaches a straight line.

According to this configuration, the belt is urged by the auxiliary roll, so that the belt can be brought into close contact with the pulley surface over the entire surface without partially floating from the pulley surface when the belt is driven. . As a result, a substantially uniform frictional force can be exerted over the entire belt surface, so that slippage between the belt and the pulley surface can be suppressed, and frictional vibration between the belt and the pulley surface can be suppressed. Occurrence can be suppressed. By suppressing the frictional vibration, it is possible to suppress the deterioration of the belt, the pulley, and the like, so that the belt driving device can be driven stably for a long time.
In addition, since the contact area between the pulley surface and the belt is increased compared to the case where no auxiliary roll is provided, the normal drag per unit area received by the belt from the pulley surface is reduced. The frictional force per unit area can be reduced. Thereby, it is possible to suppress the frictional vibration generated by the frictional force locally increasing at the contact portion between the belt and the pulley.
Further, it is possible to adjust the friction state between the belt and the pulley during the running of the belt, and it is not necessary to perform special processing on the belt in advance.

  Then, it is possible to reduce the friction coefficient between the belt and the pulley surface by supplying the liquid. In this case, the frictional force acting between the belt and the pulley can be reduced as compared with the case where no liquid is supplied. Thereby, it is possible to suppress the frictional vibration generated by the frictional force locally increasing at the contact portion between the belt and the pulley.

  Further, when the auxiliary roll is installed so as to urge the surface of the belt on which the liquid adheres, the liquid adhering to the belt at the pressing portion of the auxiliary roll is more uniformly dispersed over the entire surface of the belt. And the effect of suppressing frictional vibration can be improved.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1A is a schematic view of the belt driving device 110 according to the first embodiment of the present invention viewed from the rotation axis direction of the pulley 12. FIG. 1B is a schematic view of the belt driving device 110 viewed from the direction of arrow A in FIG. The arrow A is an arrow indicating a direction parallel to the thickness direction of the belt corresponding to the installation position of the auxiliary roller in a state where the auxiliary roller is not installed. The belt driving device 110 exemplarily shows a belt driving device used for a belt conveyor. The belt driving device 110 includes a pulley 12 that is supported so as to be rotatable about the rotation shaft 11, a belt 13 that is wound around the surface of the pulley 12 and travels as the pulley 12 rotates, The first auxiliary roll 14 (friction adjusting means) and the second auxiliary roll 15 (friction adjusting means) are mainly provided.

  The rotation shaft 11 of the pulley 12 is connected to a drive shaft of an electric motor (not shown), and the pulley 12 is configured to rotate by the rotation of the drive shaft of the electric motor.

  The belt 13 is wound while receiving a predetermined tension from the pulley 12 and another driven pulley (not shown), and the surface of the pulley 12 and a surface 13a (hereinafter referred to as a belt 13) on the side of the belt 13 in contact with the surface of the pulley 12 are contacted. It moves with the rotation of the surface of the pulley 12 due to the friction between them.

  The first auxiliary roll 14 is supported so as to be rotatable about the rotation shaft 14 a with respect to the belt driving device 110. Similarly, the second auxiliary roll 15 is also supported by the belt driving device 110 so as to be rotatable about the rotation shaft 15a. The rotating shaft 14a and the rotating shaft 15a are disposed so as to extend substantially parallel to the rotating shaft 11 of the pulley 12. The first auxiliary roll 14 is installed by the surface of the first auxiliary roll 14 so as to bias the belt 13 from a surface 13b (hereinafter referred to as a belt outer peripheral surface) that does not contact the pulley 12. The second auxiliary roll 15 is installed so as to urge the belt 13 from the belt inner peripheral surface 13 a by the surface of the second auxiliary roll 15. Both the first auxiliary roll 14 and the second auxiliary roll 15 have such a length that the belt 13 can be urged over the entire width direction of the belt 13 (direction parallel to the rotating shaft 11 of the pulley 12). It is configured.

  The belt driving device 110 according to the first embodiment is configured so that the belt 13 is sandwiched from both sides in parallel with the thickness direction by a pair of auxiliary rolls 14 and 15. That is, the rotating shaft 14a of the first auxiliary roll 14 and the rotating shaft 15a of the second auxiliary roll 15 are in the same plane, and the urging direction of the belt 13 by the first auxiliary roll 14 and the second auxiliary roll 15 is These are configured to be parallel to a plane including the rotation shaft 14a and the rotation shaft 15a (overlapping in FIG. 1B).

  Next, the effect | action by the structure of this belt drive device 110 is demonstrated. In FIG. 1A, when the pulley 12 rotates in the arrow B1 direction, the belt 13 travels in the arrow B2 direction. In the configuration without the pair of auxiliary rolls 14 and 15, the belt 13 often comes into contact with the pulley 12 in a state where the belt is warped in a cross section perpendicular to the traveling direction, and the belt 13 slips at the end in the width direction. It was easy to produce. However, according to the configuration of the belt driving device 110, the pair of auxiliary rolls 14 and 15 are installed in the vicinity of the pulley 12 on the downstream side in the rotation direction of the pulley 12. A vertical section is adjusted to a straight line. Thus, the belt 13 travels with the rotation of the pulley 12 without the end portion in the width direction of the belt 13 being lifted from the surface of the pulley 12.

  It should be noted that the pair of auxiliary rolls 14 and 15 can be installed in the vicinity of the upstream side of the pulley 12 (position before the belt 13 is wound on the pulley). In this case, the cross section perpendicular to the traveling direction is adjusted to a straight line by the pair of auxiliary rolls 14 and 15, and then wound on the pulley 12. As a result, the belt 13 starts to contact the surface of the pulley 12 simultaneously over the entire width direction, and the belt 13 travels as the pulley 12 rotates without floating from the surface of the pulley 12. Will do. In addition, when the pair of auxiliary rolls 14 and 15 are installed on both the upstream side and the downstream side of the pulley 12, it is possible to more reliably prevent the end portion in the width direction of the belt 13 from floating on the surface of the pulley 12.

  Next, the noise reduction effect when the belt driving device 110 according to the embodiment of the present invention is used will be described. FIG. 12A shows noise measurement results when the belt driving device 110 according to the embodiment of the present invention is driven. For comparison, FIG. 12B shows a noise measurement result when a belt driving device having no auxiliary rolls 14 and 15 is driven. In FIG. 12, the vertical axis represents the sound pressure (Pa) measured by a noise meter installed in the vicinity of the contact portion between the belt and the pulley, and the horizontal axis represents the time (sec) elapsed from the start of measurement. ing.

  As shown to Fig.12 (a), in the belt drive device 110 which concerns on embodiment, the absolute value of the sound pressure of a noise is about 10 Pa at maximum. On the other hand, as shown in FIG. 12 (b), in the belt driving device having no auxiliary rolls 14 and 15, the absolute value of the sound pressure of noise exceeds about 30 Pa at the maximum, and variation due to elapsed time is large. . From this, the effect which reduces the sound pressure of a noise is exhibited by using the belt drive device 110 with an auxiliary roll which concerns on embodiment. The main cause of the generation of the noise is frictional vibration between the belt 13 and the surface of the pulley 12. From the measurement result shown in FIG. 12, the belt driving device 110 is used to compare the configuration with no auxiliary roll. It can be seen that the frictional vibration can be suppressed.

  As described above, the belt driving device 110 according to the first embodiment includes the pulley 12 that is rotatably supported, and the belt 13 that is wound around the pulley 12 and travels as the pulley 12 rotates. It is equipped with. And the 1st auxiliary | assistant roll 14 and the 2nd auxiliary | assistant roll 15 which can adjust the frictional force which acts between the said belt 13 and the said pulley 12 during the driving | running | working of the said belt 13 are provided. The first auxiliary roll 14 and the second auxiliary roll 15 are rotatably supported by a rotating shaft 14a and a rotating shaft 15a, respectively, and the belt 13 travels at a contact portion of the belt 13 with the pulley 12. The surface of the belt 13 is urged so that a cross section perpendicular to the direction approaches a straight line.

  According to this configuration, the belt 13 is biased by the first auxiliary roll 14 and the second auxiliary roll 15, so that the belt 13 does not partially float from the surface of the pulley 12 when the belt 13 is driven, and the entire surface of the pulley 13 is lifted. It becomes possible to approach the state which contacted the surface of the pulley 12 over. As a result, a substantially uniform frictional force can be exerted over the entire surface of the belt 13, so that slip between the belt 13 and the surface of the pulley 12 can be suppressed, and the surfaces of the belt 13 and the pulley 12 can be suppressed. The generation of frictional vibration between the two can be suppressed. By suppressing the frictional vibration, it is possible to suppress the deterioration of the belt 13 and the pulley 12 and the like, so that the belt driving device 110 can be stably driven for a long time.

  Further, since the contact area between the surface of the pulley 12 and the belt 13 is increased as compared with the case where the first auxiliary roll 14 and the second auxiliary roll 15 are not provided, the unit area received by the belt 13 from the surface of the pulley 12 is increased. Since the vertical drag decreases, the frictional force per unit area acting between the belt 13 and the pulley 12 can be reduced. Thereby, it is possible to suppress the frictional vibration generated by the frictional force locally increasing at the contact portion between the belt 13 and the pulley 12.

  Further, it is possible to adjust the friction state between the belt 13 and the pulley 12 while the belt 13 is running, and it is not necessary to apply special processing to the belt 13 in advance. That is, any belt can be driven using the belt driving device of the present invention. Even when the belt is deteriorated, it is possible to adjust the position of the auxiliary roll and the pressing force so as to suppress the frictional vibration.

  Further, since the pair of auxiliary rolls 14 and 15 are provided so as to urge the belt 13 from both sides, the traveling direction and the vertical cross-sectional shape of the belt 13 during traveling can be made closer to a straight line.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
FIG. 2A is a schematic diagram showing a belt driving device 120 according to the second embodiment of the present invention. FIG. 2B is a schematic diagram of the belt driving device 120 viewed from the direction of arrow A in FIG. The arrow A is an arrow indicating a direction parallel to the thickness direction of the belt corresponding to the installation position of the auxiliary roller in a state where the auxiliary roller is not installed. The belt driving device 120 is different from the belt driving device 110 according to the first embodiment in the urging position of the belt 13 by the first auxiliary roll 14 and the second auxiliary roll 15. The same reference numerals are assigned to the same members, and description thereof is omitted.

  In this embodiment, the urging direction of the belt 13 by the first auxiliary roll 14 and the urging direction of the belt 13 by the second auxiliary roll 15 are arranged so as to be substantially parallel. The biasing direction vectors extending in the biasing direction from the rotating shafts of the auxiliary rolls are arranged so that the rotational shafts of the auxiliary rolls are shifted so that they do not coincide with each other. Specifically, the second auxiliary roll 15 that urges the belt inner peripheral surface 13 a side is disposed closer to the pulley 12 side than the urging position of the belt 13 by the first auxiliary roll 14. Thus, the belt 13 is configured to bend at the urging position by the second auxiliary roll 15, bend in the reverse direction at the urging position by the first auxiliary roll 14, and then move away from the pulley 12. Has been.

  In the configuration of the belt driving device 120 according to the second embodiment, since the belt 13 bends at two locations immediately after leaving the pulley 12, a cross section perpendicular to the traveling direction of the belt 13 at the contact portion immediately before leaving the pulley 12. Can be made more linear. Moreover, since the position in the urging | biasing direction of one auxiliary roll can be changed irrespective of the position of another auxiliary roll, it becomes possible to install in an optimal position easily.

  In the case where the pair of auxiliary rolls 14 and 15 are arranged on the upstream side, the belt 13 bends at two locations immediately before contacting the pulley 12, so that the belt 13 is in contact with the pulley 12 at the position where the belt 13 starts to contact. The cross section perpendicular to the traveling direction of 13 can be made closer to a straight line.

  As described above, the belt driving device 120 according to the second embodiment is configured such that the rotation shafts 14a and 15a of the pair of auxiliary rolls 14 and 15 are not on the same normal line of the belt 13. .

  According to this configuration, the position of one auxiliary roll 14 in the normal direction of the belt 13 can be adjusted independently of the positions of the other auxiliary rolls 15. Thereby, the restriction | limiting of the position adjustment of an auxiliary | assistant roll becomes less, and it becomes possible to make the running direction and perpendicular | vertical cross-sectional shape of the belt 13 closer to linear form.

  Further, the belt driving device 120 according to the second embodiment can be implemented by being modified as follows. FIG. 3 is a diagram illustrating a belt driving device 121 according to a modification of the belt driving device 120. As shown in FIG. 3, the belt driving device 121 can be configured by reversing the positions of the pair of auxiliary rolls 14 and 15 in the belt driving device 120 in the traveling direction of the belt 13. That is, the first auxiliary roll 14 can be brought closer to the pulley 12 side than the second auxiliary roll.

(Third embodiment)
Next, a third embodiment of the present invention will be described.
FIG. 4A is a schematic view showing a belt driving device 130 according to the third embodiment of the present invention. FIG. 4B is a schematic view of the belt driving device 130 viewed from the direction of arrow A in FIG. The arrow A is an arrow indicating a direction parallel to the thickness direction of the belt corresponding to the installation position of the auxiliary roller in a state where the auxiliary roller is not installed. The belt driving device 130 includes a first auxiliary roll 31 (end biasing roll) that partially biases the vicinity of both end portions in the width direction of the belt 13 and a central portion in the width direction of the belt 13 that partially. The belt driving device 110 according to the first embodiment is different from the belt driving device 110 according to the first embodiment in that it includes a second auxiliary roll 32 (a central portion biasing roll) that biases. The same reference numerals are assigned to the same members, and description thereof is omitted.

  In the present embodiment, the first auxiliary roll 31 has a roll 31a that biases the vicinity of one end portion in the width direction of the belt 13, and a shape that is the same shape as the roll 31a and that has a vicinity of the other end portion in the width direction of the belt 13. And a roll 31b. The roll 31a and the roll 31b are both installed so as to be rotatable with respect to the rotation shaft 31c. Then, the vicinity of both end portions in the width direction of the belt 13 is urged from the belt outer peripheral surface 13b side by the roll 31a and the roll 31b.

  On the other hand, the second auxiliary roll 32 includes a roll 32a that is arranged so as to bias the central portion in the width direction of the belt 13 (the portion that is not biased by the roll 31a and the roll 31b) from the belt inner peripheral surface 13a. ing. The roll 32a is rotatably installed on a rotation shaft 32b extending in parallel with the rotation shaft 31c of the first auxiliary roll 31, and the outer diameter of the roll 32a is formed as the same outer diameter as the roll 31a and the roll 31b. Has been.

  By the urging of the belt 13 by the first auxiliary roll 31 and the second auxiliary roll 32, the vicinity of both end portions in the width direction of the belt 13 is pressed so as to approach the surface side of the pulley 12, and the center portion in the width direction of the belt 13. Is pressed away from the surface side of the pulley 12. Thereby, when the width direction center part of the belt 13 leaves | separates from the surface of the pulley 12, it becomes possible to make the width direction edge part of the belt 13 which floats easily from the surface of the pulley 12 contact the surface of the pulley 12 more reliably.

  Further, the rotating shaft 31 c of the first auxiliary roll 31 and the rotating shaft 32 b of the second auxiliary roll 32 are located on the same normal line (a line extending in parallel with the thickness direction of the belt 13) of the belt 13. Even in this case, since the urging position in the width direction of the belt 13 by the first auxiliary roll 31 and the second auxiliary roll 32 is shifted, the distance between the rotary shaft 31c and the rotary shaft 32b can be made closer. Become. That is, in the contact portion between the pair of auxiliary rolls 31 and 32 and the belt 13, the pair of auxiliary rolls 31 and 32 is arranged from the state where the pair of auxiliary rolls 31 and 32 is arranged so that the cross section of the belt 13 is linear. One auxiliary roll can be pushed into the belt 13 so that the distance between the rotation axes becomes closer. Thus, fine adjustment of the contact state between the belt 13 and the pulley 12 can be performed.

  When the first auxiliary roll 31 and the second auxiliary roll 32 are arranged on the upstream side of the pulley 12, the belt 13 floats from the surface of the pulley 12 when the central portion in the width direction of the belt 13 contacts the surface of the pulley 12. It becomes possible to make the width direction edge part of the easy belt 13 contact the surface of the pulley 12 more reliably.

  As described above, the belt driving device 130 according to the third embodiment includes the first auxiliary roll 31 that partially biases the vicinity of both end portions of the belt 13 in the width direction parallel to the rotation shaft 11 of the pulley 12. And a second auxiliary roll 32 that partially urges the central portion in the width direction.

  According to this configuration, it is possible to more reliably press the width direction end portion of the belt 13 that easily floats from the surface of the pulley 12 against the surface of the pulley 12.

  Further, the belt driving device 130 according to the third embodiment can be modified as follows. FIG. 5 is a diagram illustrating a belt driving device 131 according to a first modification of the belt driving device 130. In the belt driving device 131 according to the first modification, the position of the rotation shaft 31 c of the first auxiliary roll 31 and the position of the rotation shaft 32 b of the second auxiliary roll 32 in the belt driving device 130 are shifted in the running direction of the belt 13. It is different from the belt driving device 130 in that it is. In the first modification, the second auxiliary roll 32 that urges the belt inner peripheral surface 13a is arranged closer to the pulley 12 than the auxiliary roll 33 that urges the belt outer peripheral surface 13b.

  FIG. 6 is a diagram illustrating a belt driving device 132 according to a second modification of the belt driving device 130. The belt driving device 132 according to the second modification is obtained by reversing the positions of the first auxiliary roll 31 and the second auxiliary roll 32 in the belt traveling direction in the belt driving device 131 according to the first modification. That is, the first auxiliary roll 31 that urges the belt outer peripheral surface 13b is arranged so as to be closer to the pulley 12 than the second auxiliary roll 32 that urges the belt inner peripheral surface 13a.

  FIG. 7 is a view showing a belt driving device 133 according to a third modification of the belt driving device 130. The belt driving device 133 according to the third modified example can urge the first auxiliary roll 31 in the belt driving device 131 according to the first modified example to be rotatable on the rotation shaft 33a and urge the entire width direction of the belt 13. It is constructed by replacing the length of the auxiliary roll 33 (see FIG. 7B).

  FIG. 8 is a diagram illustrating a belt driving device 134 according to a fourth modification of the belt driving device 130. The belt driving device 134 according to the fourth modification is configured to be able to urge the first auxiliary roll 31 in the belt driving device 132 according to the second modification to be rotatably supported by the rotation shaft 33a and to energize the entire width direction of the belt 13. The auxiliary roll 33 is replaced with a length (see FIG. 8B).

  In the belt driving devices 131 and 132 according to the first and second modified examples, the rotation shafts of the pair of auxiliary rolls 31 and 32 are displaced in the belt traveling direction, so that the auxiliary roll in the belt urging direction of one auxiliary roll. The position can be changed regardless of the position of other auxiliary rolls. Similarly, in the belt driving devices 133 and 134 according to the third and fourth modified examples, the rotation shafts of the pair of auxiliary rolls 33 and 32 are displaced in the belt traveling direction. The position in the direction can be changed regardless of the position of the other auxiliary roll. Thus, fine adjustment of the contact state between the belt 13 and the surface of the pulley 12 can be easily performed by adjusting the position of the auxiliary roll that partially biases the belt 13.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
FIG. 9 is a schematic view showing a belt driving device 140 according to the fourth embodiment of the present invention. This belt drive device 140 is a belt drive according to the first embodiment in that the auxiliary roll is an auxiliary roll 40 provided so as to sandwich the belt 13 in the thickness direction of the belt 13 with the pulley 12. Different from the device 110. The same reference numerals are assigned to the same members, and description thereof is omitted.

  In the present embodiment, the auxiliary roll 40 includes a roll 41 for biasing the belt 13, a rotary shaft 42 that extends substantially parallel to the rotary shaft of the pulley 12 and rotatably supports the roll 41, and the rotation. A support member 43 that supports both ends of the shaft 42 with respect to the main body of the belt driving device 140 is provided.

  The support member 43 is formed to extend to the opposite side of the pulley 12 with the support portion of the roll 41 as one end, and the other end side is installed on the main body side of the belt driving device 140. The auxiliary roll 41 is disposed at a position where the belt 13 can be sandwiched between the surface of the pulley 12 and the auxiliary roll 41 by adjusting the angle of the support member 43 and the like. For example, the end of the support member 43 opposite to the roll 41 is installed so as to be rotatable around an axis parallel to the rotation axis direction of the roll 41, and the belt 13 is placed on the surface of the pulley 12 by the weight of the roll 41. It is also possible to configure it so that it is pressed against.

  When the belt driving device 140 is driven, the belt 13 is sandwiched between the auxiliary roll 40 and the surface of the pulley 12, so that the belt 13 can be more reliably suppressed from floating on the surface of the pulley 12. The belt 13 can be driven stably with the entire surface of the belt 13 in contact with the surface of the pulley 12. Further, since the position of the belt 13 (the track when the belt travels) is almost the same as when the auxiliary roll 40 is not installed, the adjustment at the time of attaching the auxiliary roll becomes easy.

  Next, the noise reduction effect when using the belt driving device 140 according to the fourth embodiment of the present invention will be described. FIG. 13A shows a noise measurement result when the belt driving device 140 according to the fourth embodiment of the present invention is driven. For comparison, FIG. 13B shows a noise measurement result when a belt driving device having no auxiliary roll 40 is driven. In FIG. 13, the vertical axis represents the sound pressure (Pa) measured by a sound level meter installed in the vicinity of the contact portion between the belt and the pulley, and the horizontal axis represents the time (sec) elapsed from the start of measurement. ing.

  As shown in FIG. 13A, in the belt driving device 140 according to the embodiment, the absolute value of the sound pressure of noise is about 10 Pa at the maximum. On the other hand, as shown in FIG. 13 (b), in the belt drive device without the auxiliary roll 40, the absolute value of the sound pressure of noise exceeds about 30 Pa at the maximum, and variation due to elapsed time is also large. From this, it can be seen that the effect of reducing the sound pressure of the noise is exhibited by using the belt driving device 140 with the auxiliary roll according to the embodiment.

  As described above, in the belt driving device 140 according to the fourth embodiment, the auxiliary roll 40 is provided so as to sandwich the belt 13 with the pulley 12 in the thickness direction of the belt 13. Yes.

  According to this configuration, the belt 13 can be more reliably suppressed from floating from the surface of the pulley 12, and can be stably driven with the entire surface of the belt 13 being in contact with the surface of the pulley 12. is there. In addition, since the track when the belt 13 travels does not shift due to the urging of the auxiliary roll 40, adjustment when the auxiliary roll 40 is attached is facilitated.

  Further, the belt driving device 140 according to the fourth embodiment can be modified as follows. FIG. 10 is a diagram illustrating a belt driving device 141 according to a first modification of the belt driving device 140. In the belt driving device 141 according to the first modification, an elastic body 44 capable of applying an elastic force that moves or deforms the supporting member 43 to the supporting member 43 of the auxiliary roll 40 in the belt driving device 140 is installed. ing. The elastic body 44 is constituted by a spring, for example, and one end is fixed to the main body of the belt driving device 141 and the other end is fixed to the support member 43 in a state where a predetermined tensile force is applied. Thereby, the roll 41 is pressed against the belt 13 by the reaction force of the spring (elastic force of the elastic body 44).

  Further, the belt drive device 141 is provided with an attenuator 44 ′ arranged in parallel with the longitudinal direction of the elastic body 44. The attenuator 44 ′ is formed between the support member 43 and the main body of the belt driving device 141 so as to attenuate the vibration of the auxiliary roll 40 in the direction parallel to the direction in which the reaction force (elastic force) of the spring as the elastic body 44 acts. It is installed between.

  According to this configuration, when the roll 41 of the auxiliary roll 40 rotates while the belt 13 is running, the reaction force of the spring acting on the auxiliary roll 40 fluctuates, and the fluctuation of the reaction force causes the auxiliary roll 40 to vibrate. Even in this case, it is possible to suppress the vibration from increasing and to suppress the pressing force of the belt 13 by the auxiliary roll 40 from decreasing. Therefore, the effect of making the frictional force uniform can be stably exhibited.

  Note that the configuration in which the auxiliary roll is pressed against the belt using the reaction force (elastic force) of the spring is not limited to the belt driving device 141 according to the fourth embodiment, and is similarly applied to the belt driving devices according to other embodiments. Is possible.

  FIG. 11 is a diagram illustrating a belt driving device 142 according to a second modification of the belt driving device 140. The belt driving device 142 according to the second modification is provided with an actuator 45 that can apply a force that can move or deform the supporting member 43 to the supporting member 43 of the auxiliary roll 40 in the belt driving device 140. Has been. The actuator 45 is constituted by, for example, a cylinder device that operates by hydraulic pressure or pneumatic pressure. By adjusting the hydraulic pressure or pneumatic pressure, the actuator 45 applies a force to the support member 43 so that the roll 41 moves to the surface side of the pulley 12. By making it act, the pressing force of the belt 13 by the roll 41 can be adjusted.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. FIG. 14 is a diagram schematically illustrating the configuration of the water supply device 50 together with a schematic view of the belt driving device 150 according to the fifth embodiment of the present invention viewed from the direction of the rotation axis of the pulley 12. The belt driving device 150 exemplifies a belt driving device used for a belt conveyor.

  Similar to the belt drive device 110 according to the first embodiment, the belt drive device 150 is wound around a pulley 12 that is rotatably supported around the rotation shaft 11, and is wound around the pulley 12. And a belt 13 that travels with the rotation. And the water supply apparatus 50 (liquid supply apparatus) which can supply water toward the belt inner peripheral surface 13a of the belt 13 located in the rotation direction upstream of the pulley 12 is provided. As in the first embodiment, the rotation direction of the pulley 12 is the direction indicated by the arrow B1 in FIG. 14, and the traveling direction of the belt 13 is the direction indicated by the arrow B2.

  The water supply device 50 includes a tank 51 for storing water to be supplied, a pump 52 for sucking up the water stored in the tank 51, and water supplied from the pump 52 through a pipeline to the belt inner peripheral surface 13a. And a nozzle 53 for discharging toward the main body. For example, a plurality of nozzles 53 can be installed side by side in parallel with the rotation shaft 11 of the pulley 12 so that water can be discharged to the entire width direction of the belt 13. Further, the water supply and the supply stop can be switched by an operator as required by a switch or the like (not shown).

  When the water supply device 50 is driven by an operator while the pulley 12 is rotated by driving the belt driving device 150, water is continuously discharged from the nozzle 53 toward the belt inner peripheral surface 13a. Since the water is supplied to the belt inner peripheral surface 13a on the upstream side in the rotation direction of the pulley 12, the water adhering to the belt 13 moves together with the belt 13 toward the contact portion between the pulley 12 and the belt 13, and the inside of the belt It is caught between the peripheral surface 13a and the surface of the pulley 12. As a result, the friction coefficient between the belt 13 and the surface of the pulley 12 can be stably reduced while the belt 13 is running.

  It should be noted that the discharge of water is not limited to the case where it is configured to be discharged to the entire width direction of the belt 13, and is a configuration in which the water is partially discharged toward the end portion or the center portion of the belt 13 in the width direction. Also good. Further, water may be discharged toward the surface of the pulley 12 and the water may adhere to the belt inner peripheral surface 13a by the rotation of the pulley 12, or at a position where the belt 13 and the pulley 12 start to contact each other. You may comprise so that water may be discharged toward it.

  Next, the noise reduction effect when using the belt driving device 150 according to the fifth embodiment of the present invention will be described. FIG. 19 shows noise measurement results when the belt driving device 150 according to the fifth embodiment of the present invention is driven. In FIG. 19, the vertical axis represents the sound pressure (Pa) measured by a sound level meter installed in the vicinity of the contact portion between the belt and the pulley, and the horizontal axis represents the time (sec) elapsed from the start of measurement. ing. In addition, the time when the supply of water from the water supply device 50 is started is shown as t1, and the time when the supply of water is stopped is shown as t2.

  As shown in FIG. 19, before the supply of water from the water supply device 50 is started (range of 0 to t1 (sec)), the absolute value of the sound pressure measured by the sound level meter exceeds about 20 Pa. It can be seen that a loud noise is generated at the contact portion between the belt 13 and the pulley 12. On the other hand, in the range of time t1 to t2 (sec) during which water is supplied from the water supply device 50, it can be seen that the absolute value of the sound pressure measured by the sound level meter has decreased to about 10 Pa. Thereafter, when the supply of water from the water supply device 50 is stopped, the noise gradually increases.

  From this result, noise generated at the contact portion between the belt 13 and the pulley 12 can be reduced by supplying water from the water supply device 50 when the belt 13 is running using the belt driving device 150 according to the fifth embodiment. It turns out that it is. This noise is considered to be greatly affected by the sound generated by the frictional vibration between the belt 13 and the pulley 12, and the frictional vibration can be suppressed by using the belt driving device 150.

  As described above, the belt driving device 150 according to the fifth embodiment includes the pulley 12 that is rotatably supported, and the belt 13 that is wound around the pulley 12 and travels as the pulley 12 rotates. It is equipped with. The frictional force acting between the belt 13 and the pulley 12 can be adjusted by the water supply device 50 while the belt 13 is running. The water supply device 50 can supply water to the surface (belt inner peripheral surface 13a) of the belt 13 that is located on the upstream side in the rotation direction of the pulley 12 and that is in contact with the pulley 12.

  According to this configuration, it is possible to reduce the friction coefficient between the belt 13 and the surface of the pulley 12 by supplying water. In this case, the frictional force acting between the belt 13 and the pulley 12 can be reduced as compared with the case where water is not supplied. Thereby, it is possible to suppress the frictional vibration generated by the frictional force locally increasing at the contact portion between the belt 13 and the pulley 12.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. FIG. 15 is a diagram schematically illustrating a water supply device 50 and a control configuration of the water supply device 50 together with a schematic perspective view of a belt driving device 160 according to the sixth embodiment of the present invention. The same members as those in the fifth embodiment are denoted by the same reference numerals and description thereof is omitted.

  The belt driving device 160 according to the sixth embodiment further includes a position detection device 60 (position detection means) capable of detecting the positional deviation of the belt 13 in the rotation axis direction of the pulley 12. The position detection device 60 includes a light emitting element unit 61 and a light receiving element unit 62 as an optical transmission type position detector, a sensor controller 63, and a computer 64.

  The light emitting element unit 61 and the light receiving element unit 62 are installed so as to sandwich the belt 13 in the entire width direction. The position of the belt 13 in the direction parallel to the rotation axis 11 of the pulley 12 is detected by detecting the blocking state of light traveling from the light emitting element unit 61 to the light receiving element unit 62. The sensor controller 63 controls the light emitting element unit 61 and the light receiving element unit 62 and outputs the obtained position data (hereinafter referred to as detected position data) to the computer 64.

  Appropriate position data indicating that the belt 13 is in an appropriate position is input to the computer 64 in advance. The appropriate position can be, for example, a state where the belt is positioned at the center of the pulley 12 in the rotation axis direction.

Next, the control operation of the belt driving device 160 will be described.
When driving of the belt driving device 160 is started, the belt 13 travels as the pulley 12 rotates. The water supply device 50 is set to automatically supply a preset amount (hereinafter referred to as a normal supply amount) of water when the pulley 12 starts to rotate. In addition, it is good also as a structure which an operator starts supply of water by the water supply apparatus 50 manually with a switch etc.

  The position detection device 60 is set to continuously detect the position of the belt while the belt 13 is traveling. Then, the computer 64 calculates a positional deviation from the appropriate position of the running belt 13 by comparing the detected position data from the sensor controller 63 with the appropriate position data. If the calculated positional deviation is equal to or greater than a predetermined value set in advance, the computer 64 adjusts the pump flow rate adjustment valve 54 so that the amount of water supplied from the pump 52 to the nozzle 53 is less than the normal supply amount. Is done. In addition, you may control to stop supply of water, when position shift is more than the predetermined value set beforehand.

  As described above, the belt driving device 160 according to the sixth embodiment further includes the position detection device 60 capable of detecting the positional deviation of the belt 13 in the rotation axis direction of the pulley 12, and the water supply device 50 includes: When the positional deviation detected by the position detection device 60 is greater than or equal to a predetermined value, the supply of water is reduced below a normal supply amount (a liquid supply amount when the positional deviation is smaller than the predetermined value). To be controlled.

  According to this configuration, when the belt 13 meanders by supplying water and travels in a direction parallel to the rotation axis of the pulley 12 and a positional deviation from a predetermined travel position reaches a predetermined amount or more, Water supply is stopped. Thereby, it is possible to suppress the frictional force between the belt 13 and the pulley 12 from being excessively reduced by supplying water, and to suppress the belt 13 from meandering and traveling.

  Further, the belt driving device 160 according to the sixth embodiment can be modified as follows. FIG. 16 is a diagram illustrating a belt driving device 161 according to a modification of the belt driving device 160. The belt driving device 161 according to the modified example is different from the belt driving device 160 in that the light emitting element unit 61 and the light receiving element unit 62 of the position detection device 60 in the belt driving device 160 are replaced with a camera 65.

  In this belt driving device 161, the camera 65 is fixed to the main body of the belt driving device 161 so that the belt 13 of the portion that travels in contact with the pulley 12 can be photographed. In addition, image data (proper position image data) in a state where the belt 13 is traveling at an appropriate position is stored in the computer 64 in advance, and image data captured by the camera 65 when the belt 13 is traveling, The positional deviation of the belt 13 during traveling is calculated by comparing the appropriate position image data.

  In the control of the water supply amount at the time of driving the belt driving device 161, as in the control in the belt driving device 160, a positional deviation calculated from the image data photographed by the camera 65 and the appropriate position image data is set in advance. If it is equal to or greater than the predetermined value, the pump 64 is adjusted by the computer 64, and the amount of water supplied from the pump 52 to the nozzle 53 is reduced below the normal supply amount.

  According to the configuration of the belt driving device 161 according to the modified example, since the positional deviation of the belt 13 can be detected by the camera 65, there are few restrictions on the installation position of the position detecting means, which is effective.

  It is not limited to the case of using a non-contact type position detecting means, for example, a position where the belt 13 abuts when the belt 13 meanders a contact type switch that outputs a detection signal by abutment. It is also possible to control the supply of water based on the signal of the switch.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described. FIG. 17 is a diagram schematically illustrating a water supply device 50 and a control configuration of the water supply device 50 together with a schematic perspective view of a belt driving device 170 according to the seventh embodiment of the present invention. The same members as those in the sixth embodiment are denoted by the same reference numerals and description thereof is omitted.

  The belt driving device 170 according to the seventh embodiment includes a vibration meter 71 installed on the bearing 16 of the rotating shaft 11 of the pulley 12, and a noise meter 73 installed in the vicinity of the contact portion between the belt 13 and the pulley 12. Are further provided.

  The vibrometer 71 is an accelerometer installed so that the vibration acceleration of the bearing 16 that supports the rotating shaft 11 of the pulley 12 can be measured. Measurement data (hereinafter referred to as vibration measurement data) by the vibrometer 71 is amplified by the amplifier 72 and input to the computer 64.

  The sound level meter 73 is installed so as to be able to measure sound (sound pressure) emitted from the contact portion between the belt 13 and the pulley 12. Data measured by the sound level meter 73 (hereinafter referred to as noise measurement data) is amplified by the amplifier 74 and input to the computer 64.

  The computer 64 calculates a vibration level having a frequency corresponding to the frictional vibration between the pulley 12 and the belt 13 in the input vibration measurement data. Further, the noise level of the frequency corresponding to the frictional vibration in the input noise measurement data is calculated. Here, the vibration level is obtained by correcting the measured acceleration based on the frequency range of the friction vibration so as to extract data that causes the friction vibration, and then performing a logarithmic calculation of the effective value thereof. This is the amount converted to the decibel value. Similarly, the noise level is a logarithmic calculation of the effective value after correcting the measured sound pressure based on the frequency range of the frictional vibration to extract data that causes the frictional vibration. This is the amount that has been converted to a decibel value.

Next, the control operation of the belt driving device 170 will be described.
When driving of the belt driving device 170 is started, the belt 13 travels as the pulley 12 rotates. While the belt 13 is running, vibration and noise are continuously measured by the vibration meter 71 and the noise meter 73.

  When the vibration level calculated from the vibration measurement data measured by the vibration meter 71 is equal to or higher than a predetermined vibration level preset in the computer 64, the computer 64 adjusts the pump flow rate adjustment valve 54 to supply water. The supply of water at a predetermined flow rate (normal supply flow rate) is started from the nozzle 53 of the apparatus 50 to the contact portion between the belt 13 and the pulley 12.

  In addition, when the noise level calculated from the noise measurement data measured by the sound level meter 73 is equal to or higher than a predetermined noise level preset in the computer 64, the normal supply flow rate from the water supply device 50 is similarly determined. Water supply is started.

  On the other hand, the vibration level calculated from the vibration measurement data measured by the vibration meter 71 is smaller than a predetermined vibration level preset in the computer 64 and calculated from the noise measurement data measured by the sound level meter 73. When the noise level to be applied is lower than a predetermined noise level preset in the computer 64, the water supply device 50 is controlled so as to stop the water supply.

  When water is supplied from the water supply device 50, the position deviation calculated based on the position detection data detected by the position detection device 60 is set in advance, as described in the sixth embodiment. If it is equal to or greater than the predetermined value, the pump 64 is adjusted by the computer 64, and the amount of water supplied from the pump 52 to the nozzle 53 is reduced below the normal supply amount. In addition, when the positional deviation is equal to or greater than a predetermined value set in advance, the supply of water may be stopped.

  As described above, the belt driving device 170 according to the seventh embodiment further includes the vibrometer 71 installed on the bearing 16 of the pulley 12, and the water supply device 50 includes the vibration measured by the vibrometer 71. When the level is equal to or higher than a predetermined vibration level, control is performed so as to supply water. That is, if the vibration level measured by the vibrometer 71 is smaller than a predetermined vibration level, the supply of water can be stopped.

  According to this configuration, water is supplied when the vibration level of the bearing 16 of the pulley 12 is equal to or higher than a predetermined vibration level. As a result, the belt driving device 170 can be driven without constantly supplying water, and excessive reduction of the frictional force between the belt 13 and the pulley 12 can be prevented.

  The belt driving device 170 according to the seventh embodiment further includes a noise meter 73 installed in the vicinity of the contact portion between the belt 13 and the pulley 12, and the water supply device 50 includes the noise meter 73. When the noise level measured by the above is equal to or higher than a predetermined noise level, control is performed to supply water. That is, if the noise level measured by the sound level meter 73 is lower than a predetermined noise level, the water supply can be stopped.

  According to this configuration, water is supplied when the noise level of the sound emitted from the contact portion between the belt 13 and the pulley 12 is equal to or higher than the predetermined noise level. As a result, the belt driving device 170 can be driven without constantly supplying water, and excessive reduction of the frictional force between the belt 13 and the pulley 12 can be prevented.

  Further, the belt driving device 170 according to the seventh embodiment can be implemented by being modified as follows. FIG. 18 is a diagram illustrating a belt driving device 171 according to a modification of the belt driving device 170. The belt driving device 171 according to the modification is different from the belt driving device 170 in that a high-pass filter 75 is provided.

  The high pass filter 75 is configured to block a measurement signal having a frequency smaller than the lowest frequency in the frequency range of frictional vibration between the belt 13 and the pulley 12 (hereinafter referred to as the lowest frequency of frictional vibration). The frequency range of the frictional vibration can be obtained by experiment or analysis, and the frequency range to be cut off by the high pass filter 75 is set based on the lowest frequency of the frequency range obtained in advance. Thereby, the measurement data portion having a frequency lower than the lowest frequency of the frictional vibration in the vibration measurement data (measurement signal) transmitted from the vibration meter 71 to the computer 64 is blocked. Accordingly, only the portion of the measurement data obtained by the vibration meter 71 that is equal to or higher than the lowest frequency of frictional vibration is input from the vibration meter 71 to the computer 64.

  Similarly, the measurement data portion having a frequency lower than the lowest frequency of frictional vibration in the noise measurement data (measurement signal) transmitted from the sound level meter 73 to the computer 64 is blocked. Therefore, only the portion of the measurement signal from the sound level meter 73 that is equal to or higher than the lowest frequency of frictional vibration is input from the sound level meter 73 to the computer 64.

  The computer 64 controls the water supply device 50 based on the vibration measurement data input via the high pass filter 75.

  Specifically, when the amplitude of vibration acceleration in the vibration measurement data input to the computer 64 is equal to or greater than a predetermined acceleration amplitude value preset in the computer 64, the pump flow rate adjustment valve 54 is adjusted by the computer 64. Then, the supply of water at a predetermined flow rate (normal supply flow rate) is started from the nozzle 53 of the water supply device 50 to the contact portion between the belt 13 and the pulley 12.

  Similarly, when the amplitude of the sound pressure in the noise measurement data input to the computer 64 is equal to or greater than a predetermined sound pressure amplitude value preset in the computer 64, the normal supply flow rate from the water supply device 50 is also the same. Water supply is started.

  On the other hand, the amplitude of the vibration acceleration in the vibration measurement data input to the computer 64 is smaller than a predetermined acceleration amplitude value preset in the computer 64 and the sound pressure in the noise measurement data input to the computer 64 is When the amplitude is smaller than a predetermined sound pressure amplitude value preset in the computer 64, the water supply device 50 is controlled so as to stop the supply of water.

  When water is supplied from the water supply device 50, the water supply device 50 is controlled based on the position detection data detected by the position detection device 60 as in the belt driving device according to the seventh embodiment. become.

  In the belt driving device 171 according to this modification, the high-pass filter 75 controls the water supply device 50 based on the measurement data in the frequency range corresponding to the frictional vibration without complicating the data processing in the computer 64. It becomes possible to do.

(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described. FIG. 20 is a diagram schematically showing a water supply device 50 and a control configuration of the water supply device 50 together with a schematic perspective view of a belt driving device 180 according to the eighth embodiment of the present invention. This belt driving device 180 is configured by providing a first auxiliary roll 81 and a second auxiliary roll 82 to the belt driving device 150 according to the fifth embodiment, and the same members as those in the fifth embodiment are denoted by the same reference numerals. The description is omitted.

  In the belt driving device 180 according to the eighth embodiment, the belt driving device 180 is wound around the surface of the pulley 12 and the pulley 12 supported so as to be rotatable about the rotation shaft 11. The belt 13 traveling along with the belt, the first auxiliary roll 81 (friction adjusting means), the second auxiliary roll 82 (friction adjusting means), and the belt inner peripheral surface of the belt 13 positioned on the upstream side in the rotational direction of the pulley 12. The water supply apparatus 50 (liquid supply apparatus) which can supply water toward 13a is provided. The rotation direction of the pulley 12 is the direction indicated by the arrow B1 in FIG. 20, and the traveling direction of the belt 13 is the direction indicated by the arrow B2.

  The first auxiliary roll 81 is supported so as to be rotatable about the rotation shaft 81 a with respect to the belt driving device 180. Similarly, the second auxiliary roll 82 is also supported by the belt driving device 180 so as to be rotatable about the rotation shaft 82a. The rotating shaft 81a and the rotating shaft 82a are disposed so as to extend substantially parallel to the rotating shaft 11 of the pulley 12. The first auxiliary roll 81 is installed by the surface of the first auxiliary roll 81 so as to urge the belt 13 from a surface 13 b (hereinafter referred to as a belt outer peripheral surface) that does not contact the pulley 12. The second auxiliary roll 82 is installed so as to urge the belt 13 from the belt inner peripheral surface 13a by the surface of the second auxiliary roll 82. Both the first auxiliary roll 81 and the second auxiliary roll 82 have such a length that the belt 13 can be urged over the entire width direction of the belt 13 (direction parallel to the rotating shaft 11 of the pulley 12). It is configured.

  In the present embodiment, the belt 13 is configured to be sandwiched from both sides in parallel with the thickness direction by a pair of auxiliary rolls 81 and 82. The position where the belt 13 is sandwiched between the pair of auxiliary rolls 81 and 82 is arranged to be closer to the pulley 12 than the water supply position from the nozzle 53 on the upstream side in the rotation direction of the pulley 12. Has been.

  When the water supply device 50 is driven by the operator while the pulley 12 is rotated by driving the belt driving device 180, water is continuously discharged from the nozzle 53 toward the belt inner peripheral surface 13a. Since the water is supplied to the belt inner peripheral surface 13a on the upstream side in the rotation direction of the pulley 12, the water adhering to the belt 13 first moves together with the belt 13 toward the contact portion between the second auxiliary roll 82 and the belt 13. Moving. The water adhering to the belt inner peripheral surface 13a is uniformly dispersed over the entire belt surface at the contact portion between the second auxiliary roll 82 and the belt 13. Thereafter, the belt 13 having water attached to the substantially front surface of the inner peripheral surface is wound around the pulley 12. This makes it possible to more stably lower the friction coefficient between the belt 13 and the surface of the pulley 12 while the belt 13 is running.

  As described above, the belt driving device 180 according to the eighth embodiment includes the pulley 12 that is rotatably supported, and the belt 13 that is wound around the pulley 12 and travels as the pulley 12 rotates. It is equipped with. Then, the first auxiliary roll 81, the second auxiliary roll 82, and the upstream of the pulley 12 in the rotational direction can adjust the frictional force acting between the belt 13 and the pulley 12 while the belt 13 is running. A water supply device 50 capable of supplying water to the inner peripheral surface of the belt 13 located on the side. The first auxiliary roll 81 and the second auxiliary roll 82 urge the surface of the belt 13 so that a cross section perpendicular to the traveling direction of the belt 13 approaches a straight line.

  According to this configuration, the belt 13 is biased by the first auxiliary roll 81 and the second auxiliary roll 82, so that the belt 13 does not partially float from the surface of the pulley 12 when the belt is driven. It becomes possible to approach the state of being in contact with the surface of the pulley 12. As a result, a substantially uniform frictional force can be applied over the entire belt surface, so that slippage between the belt 13 and the surface of the pulley 12 can be suppressed. The generation of frictional vibrations can be suppressed. By suppressing the frictional vibration, it is possible to suppress the deterioration of the belt 13 and the pulley 12 and the like, so that the belt driving device 180 can be driven stably over a long period of time.

  Further, the unit area received by the belt 13 from the surface of the pulley 12 is increased by increasing the contact area between the surface of the pulley 12 and the belt 13 as compared with the case where neither the first auxiliary roll 81 nor the second auxiliary roll 82 is provided. Since the perpendicular drag is reduced, the frictional force per unit area acting between the belt 13 and the pulley 12 can be reduced. Thereby, it is possible to suppress the frictional vibration generated by the frictional force locally increasing at the contact portion between the belt 13 and the pulley 12.

  Further, it is possible to adjust the friction state between the belt 13 and the pulley 12 while the belt 13 is running, and it is not necessary to apply special processing to the belt 13 in advance.

  And it becomes possible to reduce the friction coefficient between the belt 13 and the surface of the pulley 12 by supplying water. In this case, the frictional force acting between the belt 13 and the pulley 12 can be reduced as compared with the case where no liquid is supplied. Thereby, it is possible to suppress the frictional vibration generated by the frictional force locally increasing at the contact portion between the belt 13 and the pulley 12.

  Further, since the second auxiliary roll 82 is installed so as to urge the surface of the belt 13 on which the water adheres, the water adhering to the belt inner peripheral surface 13a is pressed at the pressing portion of the second auxiliary roll 82. It becomes possible to disperse more uniformly over the entire belt inner peripheral surface 13a, and the effect of suppressing frictional vibration can be improved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and modifications, and various modifications can be made as long as they are described in the claims. It is something that can be done.

(1) In this embodiment, although the structure which urges | biases the belt 13 with an auxiliary | assistant roll from both surfaces was shown, it is not necessarily limited to when energizing from both surfaces. For example, a configuration in which only one auxiliary roll is used and urged from one surface of the belt 13 may be employed. Further, the number of auxiliary rolls can be variously changed according to the installation space, and the auxiliary rolls can be installed side by side at a plurality of positions.

(2) In the present embodiment, water is exemplarily shown as a liquid to be supplied to the belt. However, the liquid is not limited to water, and any liquid that can reduce friction between the belt and the pulley will be used. It is possible to use. For example, oil or alcohol can be used.

(3) In the belt driving device 170 according to the seventh embodiment, the configuration including the position detection device 60, the vibration meter 71, and the noise meter 73 is illustrated, but the configuration is not necessarily limited to the configuration including all. For example, it is possible to adopt a configuration in which only the vibration meter 71 is provided without the position detection device 60 and the noise meter 73. In this case, it is possible to control the water supply apparatus 50 based on only the measurement data from the vibrometer 71 as in the seventh embodiment. Similarly, only the sound level meter 73 may be provided. In this case, it is possible to control the water supply device 50 based on only the measurement data from the sound level meter 73 as in the seventh embodiment.

It is the schematic which shows the belt drive device which concerns on 1st Embodiment of this invention. It is the schematic of the belt drive device which concerns on 2nd Embodiment of this invention. It is the schematic which shows the modification of the belt drive device which concerns on 2nd Embodiment. It is the schematic of the belt drive device which concerns on 3rd Embodiment of this invention. It is the schematic which shows the 1st modification of the belt drive device which concerns on 3rd Embodiment. It is the schematic which shows the 2nd modification of the belt drive device which concerns on 3rd Embodiment. It is the schematic which shows the 3rd modification of the belt drive device which concerns on 3rd Embodiment. It is the schematic which shows the 4th modification of the belt drive device which concerns on 3rd Embodiment. It is the schematic of the belt drive device which concerns on 4th Embodiment of this invention. It is the schematic which shows the 1st modification of the belt drive device which concerns on 4th Embodiment. It is the schematic which shows the 2nd modification of the belt drive device which concerns on 4th Embodiment. It is a figure which shows the noise measurement result in the case where there is no auxiliary roll in the belt drive device concerning a 1st embodiment (a), and the case where there is an auxiliary roll (b). It is a figure which shows the noise measurement result in the case where there is no auxiliary roll in the belt drive device which concerns on 4th Embodiment (a), and the case where there is an auxiliary roll (b). It is the schematic of the belt drive device which concerns on 5th Embodiment of this invention. It is the schematic of the belt drive device which concerns on 6th Embodiment of this invention. It is the schematic which shows the modification of the belt drive device which concerns on 6th Embodiment. It is the schematic of the belt drive device which concerns on 7th Embodiment of this invention. It is the schematic which shows the modification of the belt drive device which concerns on 7th Embodiment. It is a figure which shows the noise measurement result in the belt drive device which concerns on 5th Embodiment. It is the schematic of the belt drive device which concerns on 8th Embodiment of this invention.

Explanation of symbols

12 Pulley 13 Belts 14 and 15 Auxiliary roll 31 Auxiliary roll (end biasing roll)
32 Auxiliary roll (Center part energizing roll)
44 Elastic body (spring)
44 'attenuator 50 water supply device (liquid supply device)
60 Position detection device (position detection means)
71 Vibrometer 73 Noise meter 110 Belt drive

Claims (12)

In a belt driving device comprising: a pulley that is rotatably supported; and a belt that is wound around the pulley and travels as the pulley rotates.
Friction adjusting means capable of adjusting the friction force acting between the belt and the pulley during travel of the belt,
The friction adjusting means is an auxiliary roll that is rotatably supported,
The auxiliary roll urges the surface of the belt so that a cross section perpendicular to a running direction at a contact portion of the belt with the pulley approaches a straight line.   The belt driving device according to claim 1, wherein at least a pair of the auxiliary rolls are provided so as to urge the belt from both sides.   The auxiliary roll includes an end biasing roll that partially biases the vicinity of both end portions of the belt in the width direction parallel to the rotation axis of the pulley, and a center that partially biases the central portion in the width direction. The belt driving device according to claim 2, comprising a part urging roll.   The belt drive device according to claim 2 or 3, wherein the rotation shafts of the pair of auxiliary rolls are not on the same normal line of the belt.   The belt driving device according to claim 1, wherein the auxiliary roll is provided so as to sandwich the belt in the thickness direction of the belt between the auxiliary roll and the pulley.   The belt driving device according to claim 1, wherein the auxiliary roll biases the surface of the belt using an elastic force of a spring.   The belt driving device according to claim 6, further comprising an attenuator that attenuates vibration of the auxiliary roll in a direction parallel to a direction in which the elastic force of the spring acts. In a belt driving device comprising: a pulley that is rotatably supported; and a belt that is wound around the pulley and travels as the pulley rotates.
Friction adjusting means capable of adjusting the friction force acting between the belt and the pulley during travel of the belt,
The friction adjusting means can supply liquid to at least one of the surface of the pulley and the surface of the belt located on the upstream side in the rotation direction of the pulley and contacting the pulley. A belt drive device characterized by the above. Further comprising position detecting means capable of detecting a displacement of the belt in the direction of the rotation axis of the pulley;
When the positional deviation detected by the position detecting means is equal to or greater than a predetermined value, the liquid supply device stops supplying liquid or exceeds the liquid supply amount when the positional deviation is smaller than the predetermined value. The belt driving device according to claim 8, wherein the belt driving device is reduced. A vibration meter installed on the pulley bearing;
The belt driving device according to claim 8 or 9, wherein the liquid supply device supplies liquid when vibration measured by the vibrometer is equal to or greater than a predetermined value. A noise meter installed in the vicinity of the contact portion between the belt and the pulley;
11. The belt drive according to claim 8, wherein the liquid supply device supplies liquid when the noise measured by the sound level meter is equal to or higher than a predetermined value. apparatus. In a belt drive device comprising: a pulley that is rotatably supported; and a belt that is wound around the pulley and travels as the pulley rotates.
Friction adjusting means capable of adjusting the friction force acting between the belt and the pulley during travel of the belt,
The friction adjusting means includes
An auxiliary roll rotatably supported;
A liquid supply device capable of supplying liquid to at least one of the surface of the pulley and the surface of the belt located on the upstream side in the rotation direction of the pulley and contacting the pulley;
The belt driving device according to claim 1, wherein the auxiliary roll biases the surface of the belt so that a cross section perpendicular to a running direction at a contact portion of the belt with the pulley approaches a straight line.

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