JP2008213966A - Hoist crane device having abnormality diagnosis function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hoist crane device having the function of diagnosing the wear amount on a gear for transmitting the driving force from a motor. <P>SOLUTION: In the hoist crane device, a hoist crane comprises a motor 1, a drive control device 8 for performing the drive control of the motor, a rotational angle detector 11 connected to a rotary shaft of the motor, a current sensor 13 for measuring the current running in the motor, and a wear diagnosis device 12 for calculating the diagnosis value of the wear state from the rotational angle of the rotary shaft and the current running in the motor. In particular, the drive control device executes the operation for inspection including the start-stop or the reverse drive by the motor, and the wear diagnosis device diagnoses the wear state based on the rotational angle of the rotary shaft to be measured from the start of the rotation before the current running in the motor rises by the engagement of the gear. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hoist crane device.

  Conventionally, in a hoist crane apparatus having a speed reducer connected to an electric motor and having a function of detecting wear of gears included in the speed reducer, means for restraining one of the gears in the speed reducer, and other gears There has been a hoist crane apparatus as disclosed in Japanese Patent Application Laid-Open No. 58-143210 provided with a means for rotating the gear and a measuring means for measuring the amount of rotation of the other gear.

  In this hoist crane device, one of the gears included in the speed reducer is constrained by the restraining means, and the other gear is rotated in one direction until stopped by interference with the constrained gear, and thereafter While rotating in the opposite direction, the amount of rotation until the interference with the constrained gear is generated and stopped is measured by the measuring means, and the measured value is compared with a predetermined set value to determine the wear state of the gear. It has a structure to detect.

JP 58-143210 A JP-A-10-332539

  However, in the conventional example described above, it is necessary to additionally install a gear restraint means and a rotation encoder for each rotation shaft of the gear for inspection in addition to the elements related to the normal load transportation of the hoist crane. As a result, the structure is complicated, and the hoist crane is increased in weight and size.

  Also, in the electric machine, as a method of diagnosing the wear state of the gear of the reduction gear connected to the electric motor, the current rise time and the start command when starting the electric motor from the normal rotation direction to the reverse rotation direction or from the reverse rotation direction to the normal rotation direction Japanese Patent Laid-Open No. 10-332539 discloses a method for detecting the wear state of a gear by measuring and quantifying a dead time from a current rise to a current rise.

  However, in a general hoist crane device, since at least the wire rope and hook block are always suspended from the main body of the hoist crane device and the rotating drum, the winding drum and the gear reducer are always loaded in the same rotational direction. In general, the gears come into contact with the tooth surfaces of the same side by the action of the load in both winding and lowering. For this reason, it has been difficult to apply a diagnosis based on a comparison of start-up currents or a method for measuring and diagnosing dead time from start-up to current rise, such as the method described in Japanese Patent Laid-Open No. 10-332539.

  An object of the present invention is to obtain a hoist crane device that can avoid complication and enlargement of the device due to addition of elements such as a gear restraint means and a rotary encoder, and can diagnose the amount of gear wear, An object of the present invention is to provide a hoist crane apparatus equipped with an abnormality diagnosis device capable of stably measuring even a gear subjected to a load in one direction by a hook block or the like and diagnosing the wear amount of the gear.

  The above-described objects include a rotatable winding drum, a reduction gear that has a built-in gear and is connected to the winding drum to transmit a rotational force, an electric motor that is connected to the reduction gear and is driven to rotate, and is wired to the electric motor for operation. An operation control device that supplies driving electric power according to instructions to the electric motor to control the operation of the electric motor, and a current that flows through the electric motor that is installed on a power transmission path that connects the operation control device and the electric motor is measured. A current sensor, and a rotation angle detection device that has a resolution capable of detecting an angle smaller than the tooth thickness equivalent angle of the gear in the speed reducer and detects the rotation angle of the rotation shaft by connecting to the rotation shaft of the electric motor; The motor is wired to the operation control device, the current sensor, and the rotation angle detection device, and the motor is operated in reverse of start / stop operation or forward rotation according to an instruction from the operation control device. When the inspection operation including the reversal operation is repeated, the current value and the rotation angle value are obtained from the current sensor and the rotation angle detection device, and the gear is engaged after the rotation start or the reverse rotation start. The change point at which the current value increases or the change amount of the rotation angle value decreases by matching is determined, and the rotation angle value measured between the rotation start or the reverse rotation start and the change point is used. This is achieved by providing a wear diagnosis device for diagnosing the wear amount of the gear.

  Further, the object is wired to the rotatable winding drum, a reduction gear that has a built-in gear and is connected to the winding drum to transmit rotational force, an electric motor that is connected to the reduction gear and is driven to rotate, and the electric motor. An operation control device that controls the operation of the motor by supplying drive power according to the operation instruction to the motor, and a current that flows through the motor installed on a power transmission path that connects the operation control device and the motor is measured. Current sensor that has a resolution capable of detecting at least an angle smaller than the tooth thickness equivalent angle of the gear in the speed reducer and is connected to the rotating shaft of the winding drum to detect the rotation angle and rotation direction of the winding drum A rotation angle detection device that is wired to the operation control device, the current sensor, and the rotation angle detection device, and that the motor is started by an instruction from the operation control device. When performing an inspection operation including a stop operation, a current value, a rotation angle value, and a rotation direction are acquired from the current sensor and the rotation angle detection device, and the operation and stop state of the motor are determined from the current value. Detected and immediately after the motor is stopped in the inspection operation, the rotation angle of the winding drum continues until the meshing of the gear due to inertia and is stopped while rotating in reverse by the meshing of the gear. This is achieved by providing a wear diagnostic device for determining the amount of wear of the gear from the rotation angle value measured between each change point, particularly determining the moment when the reversal is detected as a change point.

  Further, the above object is that the operation control device has a function of repeating the rotation start and stop by increasing the start acceleration or the stop deceleration acceleration step by step in the start / stop operation and the reverse operation included in the inspection operation. And the wear diagnostic apparatus is achieved by measuring the rotation angle value and the current value during the inspection operation.

  The operation control device controls the electric motor when the inspection execution instruction is input from the outside, and once controls the winding state of the winding drum to a predetermined rotation position, and then executes the inspection operation. To achieve this.

  Moreover, the said objective is provided with the wire rope wound up by the said winding drum, and the hook block which moves to the up-down movement according to winding-up of the said wire rope, and is included in the said hoist crane apparatus. When an instruction to execute inspection is input from outside, the current value is obtained by connecting to the current sensor while driving the electric motor, and the hook block is supported by an external fixing jig or is in a landed state. This is achieved by providing a function of detecting this and then executing the inspection operation.

  According to the present invention, it is possible to obtain a hoist crane device capable of avoiding complication and enlargement of the device due to addition of elements such as a gear restraint means and a rotary encoder, and capable of diagnosing the wear amount of the gear, It is possible to provide a hoist crane device equipped with an abnormality diagnosis device that can stably measure even a gear that is subjected to a load in one direction, such as a hook block, and can diagnose the wear amount of the gear.

  In the present invention, the electric motor rotates the rotating drum via the gear reducer, and the wire rope is wound up or down to move the hook block on the wire rope in the vertical direction, and the load attached to the hook block is removed. The hoist crane apparatus that moves in the vertical direction has a function of diagnosing the wear damage state of the gears.

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

  First, the hoist crane concerning the 1st Example by this invention is demonstrated using FIG.

  In FIG. 1, the electric motor 1 is connected to a winding drum 5 via a speed reducer 2. The speed reducer 2 includes a gear 3 and a bearing 4, and transmits the rotational force of the electric motor 1 to the winding drum 5 by meshing of the gear 3. The winding drum 5 rotates in the forward direction or the reverse direction by the rotational force of the electric motor 1 to wind or unwind the wire rope 6. The other end of the wire rope 6 is fixed to the body frame of the hoist.

  Moreover, since the hook block 7 provided to the wire rope 6 is a moving pulley, the hook block 7 moves in the vertical direction as the wire rope 6 is wound. The electric motor 1 is wired to the operation control device 8 and is driven by electric power supplied from the operation control device 8. The operation instruction of the hoist crane input to the operation input unit 9 is transmitted to the operation control device 8 through the communication device 10, and the operation control device 8 performs various operation instructions, for example, rotation start, acceleration, constant speed rotation sustain, deceleration, Electric power necessary for the motor 1 to execute the stop and reverse operations is supplied to the motor 1 to control the operation of the motor 1.

  The rotation angle detection device 11 is attached to the rotation shaft of the electric motor 1, detects the rotation angle of the rotation shaft of the electric motor 1, and outputs it to the wear diagnostic device 12. A rotary encoder or the like is used as the rotation angle detection device 11 and can be used for detecting the rotation speed of the rotation shaft of the electric motor 1 and for detecting the rotation speed. Therefore, the output from the rotation angle detection device 11 is used for measuring the rotational speed of the electric motor 1, the winding drum 5, etc., or for measuring the number of rotations and detecting the hanging height position of the hook block 7. In this embodiment, since the rotation angle detector 11 is used for detecting the wear state of the gear, the angle value corresponding to the tooth thickness at the reference circle position of the gear included in the measurement object is used. It has a resolution capable of detecting a small angle.

  The current sensor 13 is installed in the middle of the drive current path connected from the operation control device 8 to the electric motor 1, measures the value of the current flowing through the electric motor 1, and outputs it to the wear diagnostic device 12. The drive current path includes the operation control device 8, the electric motor 1, and the conductive wire therebetween. Further, the output of the current sensor 13 can be transmitted to the operation control device 8 and used as a feedback element when the operation control device 8 controls the alternating current for driving the electric motor 1. Since the current sensor 13 of the example is used for detecting the meshing of the gear, the current sensor 13 can cope with a frequency that is at least twice the meshing frequency of the gear having the highest meshing frequency in the inspection operation.

The limit device 14 includes an operation lever 15 and a limit switch (not shown) that is operated by the operation lever 15. When the wire rope 6 is wound around the winding drum 5 and the hook block 7 reaches the upper limit predetermined height position, the operating lever 15 is pushed up by the hook block 7, the limit switch is turned off, and the hook block 7 An OFF detection signal is sent to the operation control device 8 informing that the vehicle has reached the upper limit predetermined height position. Upon receiving this OFF detection signal, the operation control device 8 decelerates and stops the electric motor 1 or cuts off the electric current flowing through the electric motor 1 and activates the electric motor 1 together with the operation of the brake 16 connected to the rotating shaft of the electric motor 1. Stop and hold.

  The wear diagnosis device 12 is wired to the operation control device 8, the rotation angle detection device 11, the current sensor 13, the communication device 10, and the display alarm device 17, and during the inspection operation according to the inspection execution instruction from the operation control device 8. The rotation angle value measured by the rotation angle detection device 11 and the current value flowing through the motor 1 measured by the current sensor 13 are received, and the diagnostic value calculated using these values is displayed on the operation control device 8 and the communication device 10. Output to the alarm device 17. Further, the diagnosis value is compared with a predetermined reference value, and when it is determined that the reference value is exceeded, a signal for issuing an alarm is transmitted to the display alarm device 17 to activate the alarm. The display alarm device 17 includes a lamp, an alarm, and the like.

  The flow of the wear state diagnosis of the gear 3 according to the first embodiment will be described with reference to FIGS.

  When an instruction for inspection execution is transmitted from the operation input unit 9 to the operation control device 8 through the communication device 10, the operation control device 8 includes a predetermined operation including start / stop or reverse operation in which forward rotation start and reverse rotation start are alternately performed. The operation pattern for executing the inspection operation is called, and the electric motor 1 is first driven to move the hook block 7 to a predetermined standby position. This standby position can be set to an arbitrary winding height.

  However, for example, when the hook block 7 reaches the operating lever 15 and the position where the limit device 14 is activated is set as the standby position, the hook block 7 is moved to the same standby position every time without detecting the hook block position using another method. In addition, most of the wire rope 6 is wound around the winding drum 5 in this wound state and in the vicinity thereof. For this reason, the inspection can be executed in a state in which the load acting on the winding drum 5 is reduced by that amount, and the inertia of the winding drum 5 can be easily used. Therefore, the acceleration in the inspection operation is smaller. There is an advantage that it can be done. The rotation angle detection device 11 can operate even when the power source is different from that of the electric motor 1, the limit device 14 is activated, and the power supply to the electric motor 1 is cut off.

  Next, the operation control device 8 transmits an inspection measurement standby instruction to the wear diagnostic device 12, and after confirming the standby state, transmits a start command to the electric motor 1 and the wear diagnostic device 12. The measurement of the current flowing through the electric motor 1 through the current sensor 13 and the measurement of the rotation angle through the rotation angle detection device 11 are executed.

As shown in the representative example of FIG. 3, the wear diagnostic device 12 first rises in current value to start the rotation of the motor after the start of rotation, and then rises in current due to gear engagement. the detected by comparison with the default I _T to a point this condition gear meshed, i.e. to determine the meshing change point S, measured from start until the meshing change point S rotation angle value Is recorded by the rotation angle detector 11.

  When a series of measurements in this inspection operation are repeatedly performed while increasing the starting acceleration of the motor, as shown in the measurement example of FIG. 4, from the starting to the meshing change point S with respect to the increase in the starting acceleration. While there is a wide range in which the rotation angle value θ maintains a stable value, when the time T is measured instead of the rotation angle value, there is a tendency to decrease as the startup acceleration increases.

  Therefore, by measuring the rotation angle value θ from the start to the meshing change point S and using it for the diagnosis, it is possible to perform a stable diagnosis without strictly setting the rotational acceleration in the test operation of the electric motor 1. Become. When the measured values of the rotation angle value θ are arranged along the operation time of the hoist crane device and displayed as a trend, it is as shown in FIG. It can be determined that wear has increased at the stage where θ has started to increase rapidly. In addition to the diagnosis based on such a change trend, the wear diagnosis device 12 sends an alarm signal to the display alarm device 17 when θ exceeds a predetermined value as a reference for the gear replacement time. Then, a lamp or alarm of the display alarm device 17 is activated to notify surrounding workers that it is time to replace the gear.

  Further, the wear diagnostic device 12 transmits the diagnostic value to the communication device 10 in response to a request from the operation input unit 9 or another external terminal. The communication device 10 has a wireless or wired communication means, and transmits a wear state diagnosis result value from the wear diagnosis device 12 to the operation input unit 9 or another terminal device. Therefore, the change trend and diagnosis history of θ as shown in FIG. 5 can be managed by the operation input unit 9 or other terminal devices.

  If the wire rope 6 is replaced with a chain and the winding drum 5 is replaced with a sprocket which is a part for winding the chain, the same function can be applied to the chain hoist.

Next, a hoist crane according to a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the rotation angle detecting device 11 is different from the first embodiment in that it is attached to the rotating shaft of the winding drum 5. When the rotation angle detection device 11 is connected to the rotating shaft of the winding drum 5, when the electric motor 1 is driven and the start / stop operation or the inversion operation that repeats the forward rotation start and the reverse rotation start is performed, Immediately after stopping the motor 1 during rotation and holding it by the brake 16, the winding drum and the gear continue to rotate by the amount of backlash due to the inertia of the winding drum 5, or reverse when the gear meshes. Then, the wear amount of the gear is diagnosed using the rotation angle value measured until the final stop.

  In this case, the rotation angle detection device 11 can also determine the rotation direction. In the inspection measurement by the inspection operation, the timing at which the reversal of the rotation direction is detected is set as the meshing change point. By calculating the diagnosis value from the rotation angle value measured in the meantime, it becomes possible to diagnose gear wear more easily.

  Further, as the inspection operation, an operation in which the winding drum 5 is rotated and the wire rope 6 is wound up until the hook block 7 reaches the operating lever 15 and the limit device 14 is activated, and the winding is stopped by the limit device 14 is adopted. You may do it. In this case, since the measurement is performed in a state where the load acting on the winding drum 5 is reduced by the amount of the wound wire rope 6 by performing the measurement when the wire rope 6 is most wound up, the winding drum Thus, there is an advantage that the acceleration in the inspection operation can be made smaller, and a smaller value can be used.

  Next, a hoist crane according to a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the inspection is executed with the fixing jig 18 supporting the hook block 7 added, and the load of the hook block 7 supported by the fixing jig 18, that is, the winding drum. The embodiment is different from the first embodiment in that the inspection is performed in a state where the load acting on 5 is removed by the amount of the hook block 7.

  In addition, the current sensor 13 and the operation control device 8 are wired, the current value from the current sensor 13 is monitored by the operation control device 8, and the hook block 7 is supported by the fixing jig 18 or is landed and wound. The first embodiment differs from the first embodiment in that it has a function of detecting that the load acting on the drum 5 has been reduced by that amount by reducing the current value and determining that the standby for the inspection operation has been completed. Also in the flow of inspection, after determining that the inspection operation is on standby, it is different from the first embodiment in that the inspection operation and the inspection measurement are started by the operation input unit 9 according to the inspection execution instruction. . In the third embodiment, an operation for preparing the fixing jig 18 is required, but compared with the inspection execution with the hook block 7 landed as it is or the inspection execution in the suspended state, This has the advantage of improving the stability of the inspection state.

  Further, since the inspection operation and the inspection measurement are performed in a state where the load acting on the winding drum 5 is small, the rotation angle value can be accurately measured even with a smaller starting acceleration, and the reliability of the diagnostic value is improved. In addition to the improvement, it has the advantage that the noise generated during inspection work and the load on the gears are reduced. Further, since the decrease in the load acting on the winding drum 5 is detected and it is determined that the standby for the inspection operation is completed, the slack of the wire rope 6 at the time of inspection is minimized, and the winding drum is used when it is wound up and used again after the inspection. This has the advantage that the winding state of 5 can be easily aligned.

  As described above, in the present invention, a rotatable winding drum, a built-in gear, a speed reducer that is connected to the winding drum and transmits rotational force, an electric motor that is connected to the speed reducer and is rotationally driven, The motor is installed on a power transmission path that is wired to the motor and supplies driving power to the motor according to a driving instruction to control the operation of the motor, and connects the driving control device and the motor. A current sensor for measuring the current flowing through the motor, and a resolution capable of detecting at least an angle smaller than the tooth thickness equivalent angle of the gear in the speed reducer, and connected to the rotating shaft of the motor to determine the rotating angle of the rotating shaft. The rotation angle detection device to detect, the operation control device, the current sensor, and the rotation angle detection device are wired, and the motor is started and stopped according to an instruction from the operation control device. Alternatively, when performing an inspection operation including a reversal operation that repeats the rotation operation in the forward rotation direction and the reverse rotation direction, the current value and the rotation angle value are acquired from the current sensor and the rotation angle detection device, Alternatively, a meshing change point, which is a change point at which the current value increases or the change amount of the rotation angle value changes due to the meshing of the gear after the start of reverse rotation, is determined, and from the start of rotation or the reverse rotation start The problem is solved by obtaining a hoist crane device that is provided with a wear diagnostic device that diagnoses the amount of wear of a gear from a rotation angle value measured up to the meshing change point.

  According to this means, by first executing the start / stop operation or the reversal operation, the winding drum is usually applied to the wire rope and the wire rope, and the wire rope is wound by the winding drum. The state in which the load with the hook block that moves up and down is acting is temporarily released using the inertia of the winding drum, and the gear is created in a state where the gear can rotate and move more than the backlash.

  Next, an increase in the value of the current flowing through the motor when the gear meshes is detected to determine the meshing change point, and the measurement result of the rotation angle value from the rotation start or reversal start to the mesh change point is obtained. Used to diagnose the amount of gear wear.

  Since the rotation angle value measured in this manner has a relationship of increasing corresponding to the expansion of backlash caused by gear wear, the amount of gear wear is diagnosed from the rotation angle value. Alternatively, the wear calculated by comparing the rotation angle value with a predetermined reference value, or by comparing the rotation angle value with a past measurement value, or by substituting the rotation angle value into a predetermined conversion formula. The gear wear amount is diagnosed from the diagnostic parameter indicating the state.

  The rotational angle detector preferably has a high precision resolution. However, when diagnosing the amount of wear of the gear, at least the angle resolution corresponding to the tooth thickness of the gear to be measured is secured, and the wear width to be measured is measured. Set resolution according to accuracy.

  In addition, the wear diagnosis device is provided with a function of calculating an instantaneous rotation speed by receiving an output of a rotation angle value from the rotation detection device, and the rotation angle detection device is used to obtain the meshing change point. The change speed of the rotation angle value output from the motor, that is, the instantaneous rotation speed of the rotary shaft increases when the gear rotates idly and decreases when the gear is engaged, thereby determining the meshing change point.

  Here, the rotation angle value measured between the rotation start or reverse rotation start and the meshing change point has a relationship that increases corresponding to the increase in backlash caused by gear wear. Is used to diagnose the wear amount of the gear. In this case, the rotation angle detection device is required to have a high-resolution resolution that can detect the speed from the idle rotation of the gear to the engagement, but it is possible to omit the processing based on the current value.

  Or the said hoist crane apparatus WHEREIN: The said rotation angle detection apparatus shall be the structure which can output a rotation angle and a rotation direction, and was connected to the rotating shaft of the said winding drum. Here, the wear diagnosis device detects the operation and stop state of the electric motor from the current value measured by the current sensor, and acquires the rotation angle and the rotation direction of the winding drum from the rotation angle detection device.

  Immediately after the motor is stopped in the start / stop operation of the inspection operation, the winding drum continues to rotate until meshing with the gear due to inertia, rotates in reverse by meshing with the gear, and finally stops. During this time, the rotation angle is measured, and in particular, the moment when the inversion is detected is determined as the mesh change point each time, and the gear wear state is diagnosed from the rotation angle value measured between the mesh change points. By this method, it is possible to perform measurement with high accuracy even if the control of the inspection operation is simpler.

  In addition, the operation control device has a function of increasing the start acceleration or the deceleration acceleration in the start / stop or reverse operation stepwise in the execution of the inspection operation. Here, the startup acceleration or deceleration acceleration is increased stepwise to measure the test operation and the rotation angle value, and the rotation in a state where the rotation angle value is stable with respect to the increase in the startup acceleration. By using the angle value for diagnosis, it is possible to reduce the influence of inertia change and variation of the winding drum, or change and variation of bearing friction, and to improve diagnosis accuracy.

  In addition, the operation control device has a function of temporarily moving the hook block to a predetermined position by an instruction execution instruction and then executing the inspection operation. Thereby, the said test | inspection driving | operation is performed on the same conditions every time, and it becomes possible to suppress the dispersion | variation in test | inspection data.

  In addition, the operation control device has a function of executing the inspection operation when an instruction to perform inspection is input from the outside while the hook block is supported by a fixing jig. According to this, the load applied to the hook block can be reduced by supporting the load of the hook block by the fixing jig, and the inertia of the winding drum can be easily used.

  Therefore, it is possible to reduce the rotational acceleration or deceleration acceleration when executing the start / stop operation or the reverse operation of the inspection operation. At this time, it is possible to obtain the same measurement value even when the hook block is landed without using the fixing jig, but the posture of the hook block is adjusted using the fixing jig. This makes it easier to maintain the alignment of the winding state around the winding drum when the wire rope is wound up and used again after the inspection, and the safety of the work is improved.

  Further, the operation control device acquires a current value by connecting to the current sensor, calculates a load from the current value, and the hook block is supported by a fixing jig from a decrease in load, or the hook It is assumed that it has a function of detecting that the block has landed and then executing the inspection operation. This prevents over-winding during inspection, makes it easier to maintain the alignment of the winding state around the winding drum when the wire rope is wound up again after inspection, and reduces operational variations in inspection operation, and Work safety is improved.

It is explanatory drawing which showed the structure of the hoist crane apparatus which is 1st Example by this invention. It is explanatory drawing which showed the flow of the test | inspection in the hoist crane apparatus which is 1st Example by this invention. In the hoist crane apparatus which is 1st Example by this invention, it is the figure which showed the example of a measurement by the current sensor at the time of the rotation starting in test | inspection driving | operation. In the hoist crane apparatus which is a 1st Example by this invention, it is the figure which showed the example of a measurement of rotation angle (theta) and time T from starting when a rotation starting acceleration is increased until a meshing change point. In the hoist crane apparatus which is 1st Example by this invention, it is the figure which showed the example of a measurement of the change trend of rotation angle (theta) from a rotation start to a meshing change point. It is explanatory drawing which showed the structure of the hoist crane apparatus which is the 2nd Example by this invention. It is explanatory drawing which showed the structure of the hoist crane apparatus which is the 3rd Example by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Reduction gear 3 Gear 4 Bearing 5 Winding drum 6 Wire rope 7 Hook block 8 Operation control device 9 Operation input part 10 Communication device 11 Rotation angle detection device 12 Wear diagnostic device 13 Current sensor 14 Limit device 15 Actuation lever 16 Brake 17 Display alarm device 18 Fixing jig

Claims (5)

A rotatable winding drum, a reduction gear that has a built-in gear and is connected to the winding drum to transmit rotational force, an electric motor that is connected to the reduction gear and is driven to rotate, and is wired to the electric motor and complies with an operation instruction. An operation control device that supplies driving electric power to the electric motor to control the operation of the electric motor, a current sensor that is installed on a power transmission path connecting the operation control device and the electric motor, and that measures a current flowing through the electric motor; A rotation angle detecting device that has a resolution capable of detecting at least an angle smaller than the tooth thickness equivalent angle of the gear in the speed reducer and is connected to the rotation shaft of the electric motor to detect the rotation angle of the rotation shaft. ,
The operation control device, the current sensor, and the rotation angle detection device are wired to the operation control device, and in response to an instruction from the operation control device, the motor performs a test operation including a start / stop operation or a reversal operation that repeats normal rotation and reverse rotation. In this case, the current value and the rotation angle value are acquired from the current sensor and the rotation angle detection device, and the current value increases or rotates when the gear is engaged after rotation start or reverse rotation start. A wear diagnosis device that determines a change point at which a change amount of an angle value decreases and diagnoses a gear wear amount using a rotation angle value measured between the rotation start or the reverse rotation start and the change point; The hoist crane apparatus characterized by providing. A rotatable winding drum, a reduction gear that incorporates gears and is connected to the winding drum to transmit rotational force, an electric motor that is connected to the reduction gear and is driven to rotate, and is wired to the electric motor and complies with an operation instruction An operation control device that supplies driving electric power to the electric motor to control the operation of the electric motor, a current sensor that is installed on a power transmission path connecting the operation control device and the electric motor, and that measures a current flowing through the electric motor; A rotation angle detection device having a resolution capable of detecting at least an angle smaller than the tooth thickness equivalent angle of the gear in the speed reducer and detecting the rotation angle and the rotation direction of the winding drum by being connected to the rotation shaft of the winding drum And
Wired to the operation control device, the current sensor, and the rotation angle detection device, and when the motor performs an inspection operation including a start / stop operation according to an instruction from the operation control device, the current sensor and the The current value, the rotation angle value, and the rotation direction are acquired from the rotation angle detection device, the operation and the stop state of the motor are detected from the current value, and immediately after the motor is stopped in the inspection operation, the winding drum is The rotation angle is measured during the rotation until the meshing of the gear is continued due to the inertia and the rotation is reversed while the meshing of the gear is engaged.In particular, the moment when the reversal is detected is determined as a change point, A hoist crane device, comprising: a wear diagnosis device that diagnoses a wear amount of a gear from a rotation angle value measured between each change point. In the hoist crane apparatus in any one of Claim 1 or 2,
The operation control device has a function of repeating the start and stop of rotation by increasing the start acceleration or the stop deceleration acceleration step by step in the start / stop operation and the reverse operation included in the inspection operation, and the wear The hoist crane device, wherein the diagnostic device measures the rotation angle value and the current value during the inspection operation. In the hoist crane apparatus in any one of Claim 1 or 2,
The operation control device controls the electric motor when an inspection execution instruction is input from the outside, controls the winding state of the winding drum to a predetermined rotational position, and then executes the inspection operation. Hoist crane equipment. In the hoist crane apparatus in any one of Claim 1 or 2,
A wire rope wound by the winding drum, and a hook block that is hooked to the wire rope and moves up and down along with the winding of the wire rope, the operation control device included in the hoist crane device performs inspection execution When an instruction is input from the outside, the current value is acquired by connecting to the current sensor while driving the electric motor, and it is detected that the hook block is supported by an external fixing jig or is in a landing state, A hoist crane apparatus having a function of executing the inspection operation thereafter.

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