JP5152023B2 - Drive axis monitoring system - Google Patents

Description

  The present invention relates to a drive shaft monitoring system for diagnosing damage to a drive shaft of a rolling facility or the like.

  In a steel rolling facility, a large load is applied to the drive shaft, so the drive shaft is easily damaged, and it is important to detect the damage early to prevent failure. For this reason, disassembly inspections are regularly performed. However, since this inspection takes time and effort, inspections during operation in place of disassembly inspections are desired.

  As what enables such an inspection, Patent Document 1 includes a plurality of slave units each having a wireless communication device for transmitting detection data of a sensor and attached to a plurality of bearing cups of a cross shaft, A drive axis monitoring system has been proposed that includes a master unit that performs transmission / reception with each slave unit, and a control unit that receives and processes sensor detection data from the master unit and transmits a required signal to the master unit. .

JP 2005-233340 A

  In the drive shaft monitoring system disclosed in Patent Document 1, data from the sensor can be acquired during rolling by attaching the slave unit to the bearing cup of the cross shaft, and the drive shaft is accurately monitored. Can do. Here, when the drive shaft is rotated with no load, it is necessary to measure during rolling because the backlash is so large that accurate detection cannot be performed, and this part requires manual labor. Unmanned and automated drive shaft monitoring is an issue.

  An object of the present invention is to provide a drive shaft monitoring system that enables unattended / automated drive shaft monitoring.

  A drive shaft monitoring system according to the present invention includes a plurality of slave units each having a wireless communication device for transmitting sensor detection data and attached to a plurality of bearing cups of a cross shaft, and a parent unit that performs transmission and reception with each slave unit. In the drive axis monitoring system, the control means reserves the time zone for measurement, and the control means for receiving and processing the sensor detection data from the parent machine and transmitting the required signal to the parent machine. Measurement time zone setting means, first determination means for judging whether the drive shaft is currently under load operation, second determination means for judging whether the current time is within the reserved time zone, And a starting means for outputting a starting signal for causing the master unit to start measurement when the current load operation is being performed and the current time is within the reserved time zone.

  Both the sensor and the wireless communication device that transmits the detection data of the sensor are attached to the bearing cup to constitute one wireless sensor unit, and this wireless sensor unit is handled as a child device. The parent machine is arranged at a site such as a rolling facility in the vicinity of the child machine. The master unit is capable of multi-station communication with a plurality of slave units, and the control unit on the master unit side grasps from which shaft portion (which bearing cup) of the cross of the cross joint joint.

  As the control means, a personal computer provided with a drive shaft abnormality diagnosis means is used as in the conventional case. Conventionally, this personal computer is connected to the main unit and installed on the site side. However, in the drive shaft monitoring system according to the present invention, the personal computer is installed at a location away from the main unit (such as an office), and from this position A command can be sent to the machine. The personal computer (control means) is connected to a control panel such as rolling equipment. Various signals (for example, signals for circulating the cooling water) indicating that rolling is in progress exist in the control panel, and it is confirmed that the load operation is being performed based on the on / off of these signals.

  The slave unit and the master unit may transmit and receive using the antenna provided in the slave unit and the antenna provided in the master unit, but preferably a large fixed antenna is installed in the vicinity of the slave unit. It is preferable to transmit and receive between the slave unit and the master unit via this.

  The personal computer has a system specification that reserves diagnosis, and the personal computer incorporates automatic diagnosis means in addition to drive shaft abnormality diagnosis means. This automatic diagnosis means has a measurement time zone setting means for reserving a time zone for measurement and a judgment means (second judgment means) for judging whether the current time is within the reserved time zone. Thus, for example, the drive shaft is automatically diagnosed at an appropriate interval such as once a week or once a month. The diagnosis of the drive shaft needs to be performed during rolling (loading time, not no-loading), and the first determination means determines this. For this determination, for example, a signal indicating that rolling is being performed is transmitted from the rolling equipment to a personal computer, and when this is received by the personal computer side, it is determined that “rolling (loading)”. That's fine. That is, a signal during load operation is input from the control panel of the drive shaft to the personal computer via the network, and this is used as a trigger at the time of diagnosis. Thereby, it is recognized that the load operation is being performed, and when the first determination unit determines that the current load operation is being performed and the second determination unit determines that the current time is within the reserved time zone, the activation unit By outputting a start signal from the above, a diagnosis satisfying a necessary condition is automatically performed unattended.

  A wireless sensor unit serving as a slave unit is provided in each shaft portion (trunnion) of a cross of a cross joint, and one wireless sensor unit includes a wireless communication device including an antenna and a wireless substrate, and a sensor (for example, a displacement). Sensor), a sensor substrate in which a preamplifier, a power supply circuit, and the like are incorporated, and a battery serving as a power source for these. The slave unit is provided with a microcomputer or a control means equivalent thereto. The microcomputer is installed on, for example, a sensor board, and the memory includes a nonvolatile memory that is a storage unit that maintains recorded contents even when the power is turned off.

  The sensor is for detecting damage (peeling) of the cross joint, and is, for example, a displacement sensor (detecting damage by changing the distance from the sensor to the cross surface), but is not limited thereto. A vibration sensor that detects damage by vibration with a piezoelectric accelerometer, an AE sensor that detects damage by detecting AE (Acoustic Emission) generated from the damaged part, a temperature sensor that detects damage by temperature rise, A non-contact strain sensor (which detects damage by strain) and other sensors that detect damage by increasing the amount of strain associated with the force acting on the bearing cup from the cross through the roller, and other sensors are used as appropriate.

  According to the drive axis monitoring system of the present invention, the control means reserves the measurement time zone setting means for reserving the time zone for performing the measurement, and the first determination means for judging whether or not the drive shaft is currently under load operation. A second determination means for determining whether or not the current time is within the reserved time zone, and an activation signal for causing the master unit to start measurement when the current load operation is being performed and the current time is within the reserved time zone When the condition that the current load operation is in progress and the current time is within the reserved time zone is satisfied, the diagnosis is automatically performed unattended, thereby monitoring the drive shaft. Can be unmanned and automated.

FIG. 1 is a perspective view showing a drive shaft of a rolling facility in which the drive shaft monitoring system according to the present invention is preferably used. FIG. 2 is a sectional view showing a slave unit (wireless sensor unit) used in the drive shaft monitoring system according to the present invention. FIG. 3 is a block diagram showing a drive shaft monitoring system according to the present invention. FIG. 4 is a block diagram showing a part of the control means of the drive shaft monitoring system according to the present invention. FIG. 5 is a flowchart showing a main part of processing steps in the drive shaft monitoring system according to the present invention.

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

  FIG. 1 shows a part of the drive shaft (1) of the rolling equipment. The drive shaft (1) connects a rolling roller (not shown) and a driving motor, and transmits the rotation of the driving motor to the rolling roller. A roller rotating shaft (2) having one end coupled to the rolling roller, and an intermediate rotating shaft having one end coupled to the other end of the roller rotating shaft (2) via a cross joint (4). (3) and a motor rotating shaft having one end connected to the other end of the intermediate rotating shaft (3) via a cross joint and the other end connected to a drive motor. The configuration of the coupling part by the cross joint (4) is the same on the motor rotating shaft side and the roller rotating shaft (2) side, and a pair of rotating shafts (2) and (3) are interposed at these coupling ends. The cross shaft joint (4) is coupled so as to be relatively swingable.

  A flange yoke (5) having an angle of 90 ° is provided at the coupling end of one rotary shaft (2) so as to be opposed by 180 °, and the other rotary shaft (3) A flange yoke (6) having a size of 90 ° in angle is provided at the coupling end so as to face a position shifted by 90 ° from one of the rotating shafts (2) at a distance of 180 °. The cross shaft joint (4) has a cross (cross shaft) (7) having four shaft portions (trunnions) (7a), and a connecting portion between the cross (7) and each yoke (5) (6). And four cross bearings (8). Each flange yoke (5) (6) is provided with a female thread portion (5a) (6a), and each bearing cup (9) is provided with a bolt insertion hole (9a). At the butt end of (2), a pair of flange yokes (5) and a pair of bearing cups (9) corresponding thereto are coupled with bolts, and the butt end of the other rotating shaft (3) The pair of flange yokes (6) and the corresponding pair of bearing cups (9) are coupled by bolts so that the rotation shafts (2) and (3) transmit rotation to each other. Are combined.

  The cross (7) and the bearing cup (8) are relatively swingable, and a buffer that reduces shock when transmitting rotational motion from one rotating shaft (2) to the other rotating shaft (3). Plays a function. Thus, by allowing the movement of the rolling roller, the impact on the drive shaft (1) is mitigated. However, since the cross joint (4) is subjected to a large load due to an impact or the like, the damage proceeds with long-term use. In order to monitor the progress of the damage, each bearing cup (9) has a built-in wireless sensor unit (child device) (11) that detects the damage of the cross (7).

  As shown in FIG. 2, the bearing cup (9) is provided with a cross shaft storage space (9b) for storing the shaft (7a) of the cross (7) from the inner peripheral side. A plurality of rollers (10) are arranged in the same space (9b) so as to come into contact with the outer periphery of the shaft portion (7a) and roll.

  The wireless sensor unit (11) includes a wireless communicator (21), an eddy current type displacement sensor (22), a sensor board (23) with a preamplifier and a power circuit built therein, and a battery ( 24), a casing (25) that is detachably attached to the bearing cup (9) while holding them, and a synthetic resin cap (26) that closes the opening of the casing (25).

  As shown in FIG. 3, the drive shaft monitoring system includes a wireless sensor unit (slave unit) (11) built in each bearing cup (9) of the drive shaft (1) of the rolling equipment (A), and a wireless sensor unit. The fixed antenna (31) attached to the fixed member near the drive shaft (1) so that the wireless signal from (11) can be received, and the wireless signal from the fixed antenna (31) can be received. A main unit (32) installed at the rolling site, a diagnostic personal computer (33) installed in the office (B) and connected to the main unit (32) via a switching hub (34), and an office ( B) Photographing the PLC (35) and the drive shaft (1) connecting the diagnostic personal computer (33) and the control panel (37) of the rolling equipment (A) via the PLC network (36). And a monitoring camera (38) connected to the diagnostic personal computer (33) via the switching hub (34) and the Ethernet (39).

  From the control panel (37) of the rolling equipment (A), a load operating signal indicating that rolling is in progress is input to the diagnostic personal computer (33) via the PLC network (36).

  When the drive shaft (1) rotates, the cross (7) and the bearing cup (8) exert a force through the rollers (10), and the displacement sensor (22) is the shaft (7a) of the cross (7). However, the displacement sensor (22) detects the relative displacement between the cross (7) and the bearing cup (8) caused by this force by being arranged so as to face the contact surface with (10). Each wireless sensor unit (11) is used as a slave unit of this drive shaft monitoring system, and each wireless sensor unit (11) receives the output from the displacement sensor (22) via the wireless communication device (21). Send to the main unit (32). The wireless communicator (21) is built in the bearing cup (9), so the two drive shafts (1) are in close contact with the rolling equipment drive shaft (1), and the cross joint (4) Even when there is no gap outside, the output from the displacement sensor (22) can be easily taken out. The diagnostic computer (33) processes the data sent from each wireless sensor unit (11) to determine the degree of damage of the cross (7), and the result is displayed on the display of the diagnostic computer (33). indicate. For example, when separation occurs in the trajectory indicated by S in FIG. 2, the output from the displacement sensor (22) will be different from that at normal time, and by determining whether this difference is within an allowable range, Damage diagnosis of the drive shaft (1) can be performed. Since each shaft portion (7a) of the cross (7) usually has a different degree of damage progress, damage diagnosis is performed for each shaft portion (7a). In this way, damage can be diagnosed while the drive shaft (1) is in operation.

  In the office (B), the diagnosis of the cross (7) can be seen on the display of the diagnostic PC (33), and the rotation state of the drive shaft (1) is fixed by the surveillance camera (38). The installation status of the antenna (31) and the base unit (32) can also be monitored.

  As shown in FIG. 4, in addition to the abnormality diagnosis means (41) for detecting the damage state of the drive shaft (1) from the output of the displacement sensor (22), the diagnosis personal computer (33) automatically performs diagnosis. The automatic diagnosis means (42) for making it perform is incorporated.

  The abnormality diagnosing means (41) is a well-known part and will not be described in detail. The wear determination means for determining the wear state based on the average value of the waveform obtained, and the peel determination means for determining the peel state from the amplitude of the waveform from which the rotation synchronization component has been removed.

  The automatic diagnosis means (42) has a measurement time zone setting means (51) for reserving a time zone for measurement, and a drive shaft (1) based on a signal from the control panel (37) of the rolling equipment (A). First determining means (52) for determining that the current load operation is in progress, second determination means (53) for determining whether the current time is within the reserved time zone, current load operation and the current time And automatic starting means (54) for automatically outputting a starting signal for causing the master unit (32) to start measurement when the time is within the reserved time zone.

  According to this drive shaft monitoring system, as shown in FIG. 5, at the start of diagnosis, first, whether or not rolling is in progress is determined by the first determination means (52) (S1). This determination (first determination step (S1)) is based on the fact that a rolling signal is input to the diagnostic personal computer (33) via the PLC network (36) from the control panel (37) of the rolling equipment (A). When a signal during rolling is input from the control panel (37) of the rolling equipment (A), the process proceeds to the second determination step (S2) which is the next step. In the second determination step (S2), it is determined by the second determination means (53) whether it is a reserved time zone. If it is not the reserved time zone, the second determination step (S2) is repeatedly executed at appropriate intervals, and if it is determined as the reserved time zone (thus, during rolling and in the reserved time zone), the next The process proceeds to the measurement and diagnosis step (S3). In the measurement and diagnosis step (S3), a start signal for causing the master unit (32) to start measurement is output by the automatic start means (54), whereby the measurement and abnormality diagnosis means (41) by the displacement sensor (22) is output. ) Is diagnosed. When the drive shaft (1) is rotated with no load, it cannot be detected with high accuracy due to large play, but the condition that rolling is performed by performing diagnosis according to the steps (S1) to (S3) above. Is satisfied, and an accurate diagnosis becomes possible.

  In the measurement time zone setting means (51), an appropriate date and time, for example, once a week and once a month is set as a reservation time zone, and when rolling is performed in this reservation time zone Diagnosis by unmanned and automated is performed.

  Note that it is also possible to manually transmit a system activation signal from the diagnostic personal computer (33) to the master unit (32), and diagnosis can be performed as appropriate regardless of the set date and time of the reserved time zone. At this time, conventionally, it was necessary to bring the master unit (32) close to the wireless sensor unit (slave unit) (11) and make it ready for reception at the site of the rolling equipment (A). Is not necessary, and can be diagnosed by remote control from the office (B), and the drive shaft (1) can be monitored easily and safely.

(1) Drive shaft
(7) Cross (cross axis)
(9) Bearing cup
(11) Wireless sensor unit (slave unit)
(21) Wireless communication device
(22) Displacement sensor (sensor)
(32) Base unit
(33) PC for diagnosis (control means)
(51) Measurement time zone setting method
(52) First determination means
(53) Second determination means
(54) Automatic starting means

Claims (1)

A plurality of slave units each having a wireless communication device for transmitting sensor detection data and attached to a plurality of cross-shaped bearing cups, a master unit that performs transmission / reception with each slave unit, and a sensor detection data A drive axis monitoring system comprising control means for receiving and processing from the machine and transmitting a required signal to the parent machine,
The control means reserves a measurement time zone setting means for reserving a time zone for measurement, first determination means for judging whether or not the drive shaft is currently under load operation, and the current time is within the reserved time zone. Second determination means for determining whether or not the current load operation and the current time is within the reserved time zone, and an activation means for outputting an activation signal for causing the parent device to start measurement. A drive shaft monitoring system characterized by that.

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