JP5479728B2 - Wire rope monitoring device and wire rope monitoring method - Google Patents

Description

  The present invention relates to a wire rope monitoring device and a wire rope monitoring method, and more particularly to a wire rope monitoring device and a wire rope monitoring method used for a crane or the like.

  Wire ropes used in cranes, etc. are repeatedly bent by a wire rope by a pulley (sheave) or drum under the tensile load in the axial direction, that is, the magnitude of the load applied to the wire rope, and the load being applied. The wire breaks depending on the number of times, that is, the bending frequency for each load. As described above, when an abnormal state or a life span such as a wire rope breakage is reached, a serious accident is caused.

  Therefore, in order to ensure the safety of the work environment, the wire rope is replaced when a certain usage limit is reached. As standard for wire rope replacement, structural standards such as cranes indicate that 10% or more of the number of wire rope strands are cut, and that the diameter reduction exceeds 7% of the nominal diameter. ing. Therefore, it is necessary to perform periodic inspections to ensure the safety of the wire rope.

  However, inspecting the wire rope over the entire length has a problem of requiring a great deal of labor and time. In order to solve this problem, the life expectancy of a wire rope has been conventionally performed.

  For example, Patent Literature 1 describes a wire rope diagnostic apparatus that detects a load using a load cell and detects a bending occurrence frequency using a pulse generator to predict a lifetime. In Patent Document 2, a load is detected from the load current of a wire rope drive motor, and the bending occurrence frequency is detected from the amount of movement of the hook in the vertical direction based on the number of rotations of the wire rope drive motor. A wire rope life prediction method and apparatus are described. Furthermore, in Patent Document 3, the life is predicted by detecting the load from the load current of the wire rope drive motor and the bending occurrence frequency by the time integral of the rotational speed of the wire rope drive motor, which is obtained by the movement distance of the wire rope. A wire rope life determination method and apparatus are described.

JP-A-62-132144 Japanese Patent Laid-Open No. 7-172863 Japanese Patent Laid-Open No. 10-7323

  However, in the conventional method, the number of times of bending for each load of the wire rope was output, but it was not clearly shown which part of the wire rope was bent.

  Therefore, in the case of inspecting the wire rope, it is necessary to inspect the entire length of the wire rope.

  The objective of this invention is providing the wire rope monitoring method and wire rope monitoring apparatus which can perform the inspection work of a wire rope easily.

  Another object of the present invention is to provide a wire rope monitoring device and a wire rope monitoring method capable of grasping the load distribution and the bending frequency distribution over the entire length of the wire rope.

  Still another object of the present invention is to provide a wire rope monitoring device and a wire rope monitoring method that can give priority to inspection work by displaying the distribution of the load and the distribution of the number of bendings in association with the positional relationship of the wire rope. Is to provide.

  Still another object of the present invention is to provide a wire rope monitoring device and a wire rope monitoring method capable of performing life prediction adapted to the use situation in each site by accumulating data on the number of flexures and improving the efficiency of inspection work. That is.

In order to achieve the above object, the wire rope monitoring device of the present invention comprises a wire rope wound between an upper pulley and a lower pulley to which a hook is attached, and winding and lowering operations of the wire rope. An induction motor to perform, and a main control unit for controlling the induction motor, the main control unit is configured to generate a predetermined pulse according to the amount of rotation of the upper pulley, and a current value of the induction motor A load conversion unit that measures a load attached to the hook, and the main control unit includes a plurality of sections in which the wire rope is divided into predetermined lengths equal to or less than half of the circumference of the lower pulley. the number of unit length to set the location information to the respective wire rope, bending in response to the position information in contact with the wire rope of the upper pulley located at a position bending occurs in the wire rope The number of times that each bending number measuring point located at a position bending occurs in the wire rope in contact fixed point and the wire rope of said lower pulley is in contact with each of the plurality of unit length wire rope in the pulse generator The life of the wire rope is monitored by counting in association with the number of generated pulses and by measuring the load hung on the hook of the lower pulley obtained from the load converter.

  In the wire rope monitoring device of the present invention, the main control unit further includes a display unit, and the display unit includes position information of the plurality of unit length wire ropes, the upper pulley, and the lower pulley. The number of contact with each unit length wire rope is displayed in association with each other.

The wire rope monitoring method of the present invention includes a wire rope wound between an upper pulley and a lower pulley to which a hook is attached, an induction motor that performs winding and unwinding operations of the wire rope, A main control unit for controlling the induction motor, the main control unit being attached to the hook from a pulse generator for generating a predetermined pulse in accordance with a rotation amount of the upper pulley, and a current value of the induction motor In the wire rope monitoring method including a load conversion unit for measuring a load, the wire rope is divided into a predetermined length that is half or less than the circumference of the lower pulley, and the predetermined length is divided. A step of associating position information with the plurality of unit length wire ropes, a step of acquiring position information where the upper pulley and the lower pulley are in contact with each other, and the load converter A step of measuring the weight to be suspended on the hook of the serial lower pulley, the upper the wire rope and in contact with bending number measurement position at a position bending occurs in the wire rope pulley in response to rotation of the induction motor The pulse generator generates the number of times each of the number-of-bending measurement points located at a point where the point and the wire rope of the lower pulley come into contact with each other and the wire rope bends contacts the plurality of unit length wire ropes. A step of counting in association with the number of pulses, the load counted in the step of measuring the load suspended on the hook of the lower pulley, and the upper pulley obtained in the step of counting with the pulse generator The life of the wire rope is monitored from the number of contact between the lower pulley and the plurality of unit length wire ropes. It is configured.

  ADVANTAGE OF THE INVENTION According to this invention, the wire rope monitoring apparatus and wire rope monitoring method which can perform the inspection work of a wire rope easily are realizable. In addition, it is possible to grasp the load distribution over the entire length of the wire rope and the distribution of the number of bends, so it is possible to focus on the places where the wire rope is bent many times and improve the efficiency of the wire rope inspection work. A wire rope monitoring device and a wire rope monitoring method can be realized. Furthermore, it is possible to prioritize inspection work by displaying the distribution of the load and the distribution of the number of bendings in association with the positional relationship of the wire rope. Furthermore, the data of the number of times of bending is stored, and the number of times of bending when the life is reached is recorded, so that it has an excellent effect such as being able to predict the life suitable for the use situation.

  Next, the best mode for carrying out the present invention will be described based on the following embodiments with reference to the drawings.

  First, the configuration and operation of an inverter crane apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing an overall configuration of the inverter crane apparatus, and FIG. 2 is a block diagram showing a configuration of a main part of the inverter crane apparatus.

  The inverter type crane apparatus includes a crane hook 1, a wire rope 2, a hoisting induction motor 3, a hoisting apparatus 4, a traverse induction motor 5, a traverse apparatus 6, a traverse girder 7, a travel induction motor 8, and a travel apparatus 9. , Girder 10 for traveling, hoisting and traversing inverter device (referred to as main control unit) 11, hoisting and traversing inverter control unit 12, operation input device 13, hoisting inverter 14, traversing inverter 15, and induction motor The brake 16, the traveling inverter device 17, the traveling inverter control unit 18, and the traveling inverter 19 are configured.

  The inverter type crane device is configured to wind and unload the load attached to the crane hook 1 by the hoisting device 4 provided with the hoisting induction motor 3 so as to wind the wire rope 2 in the Z direction (arrows in the Z direction and the −Z direction). In other words, the load is moved up and down. Further, in the X direction (indicated by arrows in the X direction and the −X direction), the traverse device 6 including the traverse induction motor 5 and the traverse girder 7 are moved in the X direction. Further, in the Y direction (indicated by arrows in the Y direction and the −Y direction), the traveling apparatus 9 including the traveling induction motor 8 and the traveling girder 10 move in the Y direction.

  The hoisting and traverse induction motors 5 and the traverse induction motor 5 are controlled by the hoisting / traverse inverter control unit 12 of FIG. That is, when the operator inputs a predetermined instruction from the operation input device 13, the hoisting / traverse inverter control unit 12 controls the hoisting inverter 14 and the traverse inverter 15, and the hoisting inverter 14 and the traverse inverter 15, the frequency, voltage, and current necessary for control are applied to the hoisting induction motor 3 and the traverse induction motor 5, and simultaneously, the induction motor brake 16 is controlled to be released, so that the load attached to the crane hook 1 falls. Without moving in the Z direction. In the case of the traversing device 6, the hoisting device 4 is moved in the X direction along the traversing girder 7. Similarly, when the operator inputs a predetermined instruction from the operation input device 13, the traveling induction motor 8 attached to the traveling device 9 causes the traveling inverter control unit 18 of FIG. 2 stored in the traveling inverter device 17 to travel. Winding along the traveling girder 10 by controlling the inverter 19 and applying the frequency, voltage and current necessary for the control from the traveling inverter 19 to the traveling induction motor 8 and simultaneously controlling the release of the induction motor brake 16. The upper device 4 is moved in the Y direction.

  Further, the winding inverter 14 includes a current measuring unit 51. The current measuring unit 51 measures a current value for driving a winding induction motor 3 that rotates a drum 20 described later.

The hoisting / traverse inverter control unit 12 includes a load conversion unit 52, a pulse generator 53, a storage unit 54, and a display unit 55. The load conversion unit 52 converts the current value data measured by the current measurement unit 51 into load data by a predetermined calculation. That is, the current value for driving the hoisting induction motor 3 changes according to the weight of the load attached to the crane hook 1, and this current value is converted into load data by the load conversion unit 52. By doing so, the load can be measured. For example, if the load increases, the current value for driving the hoisting induction motor 3 increases, and if the load decreases, the current value for driving the hoisting induction motor 3 decreases. Needless to say, the relationship between the current value and the load data can be easily determined experimentally in advance or by a predetermined calculation.
The pulse generator 53 generates a pulse according to the rotation amount of the drum 20 described later. This will be described later. The storage unit 54 stores the number of times the wire rope 2 is bent, load information, and the like. Details of the number of bendings and load information will be described later.

  FIG. 3 is a conceptual diagram showing a main part of the inverter crane apparatus for explaining the features of the present invention. The wire rope 2 is wound around a drum 20 (referred to as an upper pulley) provided at an upper portion and a moving sheave 21 (referred to as a lower pulley) provided at a lower portion, and a wire rope fixed end 23 is fixed to the fixed sheave 22. It is fixed.

  First, in the present invention, the wire rope 2 is divided into a plurality of unit length wire ropes so that the inspection work of the wire rope is facilitated and the load distribution and the distribution of the number of bendings can be grasped over the entire length of the wire rope. That is, in this division, the wire rope 2 is divided at equal intervals, and each divided portion is referred to as a unit length wire rope 24 and is hereinafter abbreviated as a unit portion. The length of the unit portion 24 is determined as follows. That is, based on the diameter of the drum 20 and the moving sheave 21 where bending occurs, the diameter of the moving sheave 21 that is generally smaller in diameter than the drum 20 is used as a reference. For example, the case where the total length of the wire rope 2 is 10 m, the diameter of the drum 20 is 300 mm, and the diameter of the moving sheave 21 is 200 mm will be described. Since the diameter of the moving sheave 21 is 200 mm, the circumference is about 628 mm. The length of the wire rope 2 that actually hangs on the moving sheave 21 is at most half the circumference of the moving sheave 21 (314 mm). Therefore, the length of the unit portion 24 is preferably 314 mm or less. In consideration of an inching operation such as inching that moves the wire rope little by little to raise and lower the load, the shorter the unit 24, the more the bending frequency measurement can be emphasized. However, from the viewpoint of actual inspection, when the length of the unit portion 24 is too short, the number of the unit portions 24 increases, and the inspection work and life prediction become complicated. Therefore, in the present embodiment, the length of the unit portion 24 is set to 100 mm through experiments conducted in advance. As a result, since the total length of the wire rope 2 is 10 m and the length of the unit part 24 is 100 mm, the unit part 24 divides the wire rope 2 into 100 parts. In the present embodiment, the case where the total length of the wire rope 2 is 10 m and the wire rope 2 is divided into 100 will be described. However, the present invention is not limited to this, and the length of the wire rope and the diameter of the moving sheave are not limited thereto. Needless to say, it is set as appropriate.

  Next, collection of position information when the unit unit 24 is moved by the rotation of the drum 20 will be described in detail. First, numbers are assigned in order such as L001, L002,... L100 from the wire rope fixed end 23 of the wire rope 2 to each unit portion 24. This will be referred to as the address of the unit portion 24. In the present embodiment, as a means for grasping the degree of fatigue of the wire rope 2, the number of times of bending for each unit portion 24 of the wire rope 2 is measured. Next, Table 1 shows the relationship between the pulse generated by the pulse generator 53 due to the rotation of the drum 20 and the address of the unit 24 described above.

  Table 1 shows the addresses L001, L002,... L100 of the unit part 24 and N0. And correspond to each other. That is, the first pulse (No. 1) of the pulse generator 53 is associated with the address L001 of the unit section 24. Further, the second pulse (No. 2) of the pulse generator 53 is associated with the address L002 of the unit section 24. Similarly, by associating the 100th pulse (No. 100) of the pulse generator 53 with the address L100 of the unit part 24, the address of the unit part 24 can be specified by the number of pulses. In Table 1, the position information can be represented by length information from the wire rope fixed end 23 of the wire rope 2, that is, 100 mm, 200 mm,.

  Next, the wire rope 2 deteriorates or wears at the portion where the wire rope 2 contacts the drum 20 and the moving sheave 21. These contacting portions are referred to as bending number measurement points and are represented by MP1, MP2, and MP3, which are shown in FIG. The bending number measurement points MP1, MP2, and MP3 are pulse Nos. Generated by the pulse generator 53 according to the rotation of the drum 20. Can be obtained as shown in Table 1. That is, in the initial state (starting time) of the wire rope device, the bending number measurement point MP1 is located at the address L100 of the unit portion 24, the bending number measurement point MP2 is located at the address L051 of the unit portion 24, and The bending number measurement point MP3 is located at the address L049 of the unit portion 24. Next, when the drum 20 moves 100 mm in the winding direction, 1 is subtracted from the number of pulses. Accordingly, the bending number measurement point MP1 is located at the address L099 of the unit portion 24, the bending number measurement point MP2 is located at the address L050 of the unit portion 24, and the bending number measurement point MP3 is located at the unit portion 24. It will be located at address L048. Similarly, by subtracting a predetermined number of pulses in accordance with the rotation of the drum 20 in the winding direction, the position of the bending frequency measurement point can be obtained by calculation. On the contrary, in the winding down direction, it can be obtained by calculation by adding a predetermined number of pulses according to the rotation of the drum 20. These calculations can be obtained by calculation in a calculation unit (for example, a CPU, not shown) included in the hoisting / crossing inverter control unit 12. The acquisition of the position information of the bending number measurement points MP1, MP2, and MP3 shown in Table 1 is an example, and the present invention is not limited to this. Details of the measurement of the number of bendings at the bending number measurement point will be described later.

  Next, the measurement of the number of bendings at the bending number measurement point will be described in detail. In order to grasp the degree of fatigue (deterioration or wear, etc.) of the wire rope 2, the wire rope 2 is bent at the location where the state of the wire rope 2 changes, that is, at the drum 20 and the moving sheave 21 as described above. Define a location as a measurement point. Here, as described above, three measurement points MP1 on the drum 20 and MP2 and MP3 on the moving sheave 21 are determined as measurement points. And when the unit part 24 passes these measurement points (bending frequency measurement points MP1, MP2, MP3), the bending frequency is counted. Next, measurement of the number of bendings will be described.

  FIG. 4 is a diagram for explaining the measurement of the number of bendings. 4A to 4D are views showing a state in which the wire rope 2 around which the moving sheave 21 is wound is moved in order counterclockwise by the length of L043 to L053 of the unit portion 24. FIG. 4 (e) and 4 (f) classify the movement state of the wire rope 2 into four patterns, and the unit portions 24 (L047 to L051) in the states (a) to (b) for each pattern. It is a table | surface which shows the example which accumulated the number of times of bending.

  Pattern 1 has a wire rope moving direction (a) → (b) → (c) → (d), pattern 2 has (b) → (c) → (b) → (c), and pattern 3 has (a). → (b) → (a) → (b), pattern 4 is the case of (a) → (b) → (stop) → (c). These patterns are classified from the viewpoint of the moving direction of the wire rope 2. There are two main operations of the wire rope 2, that is, an operation that performs a normal hoisting operation and an operation that is repeatedly performed by an inching operation or the like. The above four patterns are classified from the viewpoint of the forward direction and the reciprocating direction, with the former being the forward direction of the movement direction of the wire rope 2 and the latter being the reciprocating direction. Patterns belonging to the forward direction are patterns 1 and 4, and patterns belonging to the reciprocating direction are patterns 2 and 3. Note that patterns 1 and 4 are both patterns belonging to the forward direction, but pattern 4 considers a stopped state on the way. Patterns 2 and 3 both belong to the pattern in the reciprocating direction, but consider the case where the initial state is different.

  Next, counting of the number of bendings of the unit portion 24 in each pattern will be described. FIGS. 4E and 4F show an example in which the number of bendings in each unit portion 24 (addresses L047 to L051) shown in FIGS. 4A to 4B in the patterns 1 to 4 is accumulated. It is a table. From the top to the bottom of the state of each pattern, for example, in pattern 1, transition is made in the order of (a) (b) (c) (d), and the uppermost state of each pattern is set to the initial state (stopped). . Note that states (a) to (d) in FIGS. 4 (e) and 4 (f) correspond to FIGS. 4 (a) to 4 (d).

  The conditions for counting the number of bendings are the following three conditions A, B, and C. Condition A is when the unit 24 exists on the bending number measurement points MP2 and MP3. Condition B is a case where the unit portion 24 is suspended from the bending number measurement points MP2 and MP3. The condition C is a case where the unit 24 exists on the bending number measurement points MP2 and MP3 at the start of operation (at startup). If any of these three conditions is satisfied, the number of bendings is counted.

  First, the pattern 1 will be described. Pattern 1 is a pattern of forward movement of the wire rope 2 as described above.

  The cumulative number of bendings of the five unit parts 24 (addresses L047, L048, L049, L050, L051) will be described in order from the address L047. First, the address L047 is not in contact with the moving sheave 21 in the state (a). That is, it is not in contact with the bending number measurement point MP3 (FIG. 4A). Therefore, the number of times is not counted and the total number of times is zero. Next, when transitioning to the state (b), the address L047 hangs over the bending number measurement point MP3. Therefore, since the condition B is satisfied, it is counted once and the cumulative number is 1. Next, when transitioning to the state (c), the address L047 exists at a position outside the bending number measurement point MP3. Therefore, the number of times is not counted, and the cumulative number remains one. Next, when a transition is made to the state (d), the address L047 still exists at a position deviating from the bending point measurement point MP3 as in the case of the state (c). Therefore, the number of times is not counted, and the cumulative number remains one. As described above, the total number of bendings of the address L047 is 1 in the end.

  Next, the address L048 will be described. In the state (a), the address L048 exists at the bending number measurement point MP3. Therefore, since the condition A is satisfied, it is counted once and the cumulative number is 1. Next, when transitioning to the state (b), the address L048 is present at a position outside the bending number measurement point MP3. However, in the state (a) immediately before the transition, the address L048 is present at the bending number measurement point MP3, so the condition C is satisfied, and the number of times is counted once. Accordingly, in the state (b), the count is further increased once, and the cumulative number becomes 2. Next, when the state transitions to the state (c), the address L048 exists at a position deviating from the bending number measurement point MP3 as in the case of the state (b). Therefore, the number of times is not counted, and the total number of times remains 2. Next, when transitioning to the state (d), the address L048 exists at a position deviating from the bending number measurement point MP3, as in the case of the state (c). Therefore, the number of times is not counted, and the total number of times remains 2. As described above, the total number of bendings of the address L048 is 2 after all.

  The cumulative number of bendings of the address L047 and the address L048 in the pattern 1 has been described above, but the other unit portions 24 (addresses L049, L050, and L051) of the pattern 1 are counted in the same manner as the addresses L047 and L048 described above. To do. As described above, the number of bendings is measured for the addresses L049, L050, and L051, and as a result, the total number of bendings is two for each of the addresses L049, L050, and L051. Note that the total number of bendings of the patterns 2 to 4 is the same as that of the pattern 1 described above, and thus detailed description thereof is omitted.

  In the above-described embodiment, the bending number measurement points MP2 and MP3 of the moving sheave 21 have been described. However, it is needless to say that the bending number measurement point MP1 of the drum 20 can be measured by the same method. . Therefore, detailed description is omitted.

  Next, the operation of the present invention will be described. FIG. 5 is a flowchart for explaining the operation of the embodiment of the present invention. First, step S501 is a step of acquiring load information. As described above, the load information can be acquired by converting the current value data measured by the current measurement unit 53 into load information data by the load conversion unit 53. If load information is acquired, the number of times of bending for every unit part 24 will be measured next.

  In step S502, it is determined whether or not the unit unit 24 exists on the bending sheave measurement points MP2 and MP3. When the determination result exists on the bending number measurement points MP2 and MP3 (in the case of YES), the process proceeds to step S503. In step S503, the number of times of bending at the moving sheave 21 of the unit portion 24 is counted up. Then, the process proceeds to step S504. On the other hand, when the determination result in step S502 does not exist on the bending number measurement points MP2 and MP3 (in the case of NO), the process proceeds to step S504.

  In step S504, it is determined whether or not the unit portion 24 is present on the bending number measurement point MP1 of the drum 20. When the determination result exists on the bending number measurement point MP1 (in the case of YES), the process proceeds to step S505. In step S505, the number of times of bending of the unit portion 24 on the drum 20 is counted up. Then, the process proceeds to step S506. On the other hand, also when the determination result in step S504 does not exist on the bending number measurement point MP1 (in the case of NO), the process proceeds to step S506.

  In step S506, it is determined whether or not the unit 24 is hung on the bending number measurement points MP2 and MP3 of the moving sheave 21. When the determination result hangs on the bending number measurement points MP2 and MP3 (in the case of YES), the process proceeds to step S507. In step S507, the number of times of bending at the moving sheave 21 of the unit portion 24 is counted up. Then, the process proceeds to step S508. On the other hand, when the determination result in step S506 does not hang over the bending number measurement points MP2 and MP3 (in the case of NO), the process proceeds to step S508.

  In step S508, it is determined whether or not the unit unit 24 is hung on the bending frequency measurement point MP1 of the drum 20. When the determination result hangs on the bending number measurement point MP1 (in the case of YES), the process proceeds to step S509. In step S509, the number of times of bending of the unit portion 24 by the drum 20 is counted up. Then, the process proceeds to step S510. On the other hand, also when the determination result in step S508 does not hang over the bending number measurement point MP1, the process proceeds to step S510.

  In step S510, it is determined whether or not to continue the operation of the inverter crane apparatus. When the determination result is to continue driving (in the case of YES), the process returns to step S501 and the operations so far are repeated. On the other hand, when the determination result in step S510 indicates that the operation is not continued (in the case of NO), the measurement of the number of bendings ends.

  Table 2 shows the count values for a predetermined period, for example, three months, for each of the bending number measurement points MP1, MP2, and MP3 as described above. This count table is stored in the storage unit 54.

  Table 2 shows count numbers obtained by counting the number of bendings for each address of each unit 24 for each load at each bending number measurement point MP1, MP2, MP3, for example, for three months. Here, the load is a light load, a medium load, or a heavy load by appropriately classifying the load measured by the load conversion unit 53. This load classification is, for example, a light load of less than 50% of the rated load, an intermediate load of 50 to 80%, and a heavy load of 80% or more. However, it is needless to say that this load category is an example and is not limited to this category.

In this way, the number of bendings at the bending number measurement points MP1, MP2, and MP3 is accumulated and stored in the storage unit 54. Now, whether or not it is time to replace the wire rope 2 is determined by the number of times the wire rope 2 is bent in advance and, for example, the wire rope replacement criteria described above, that is, strands of 10% or more of the number of strands of the wire rope are cut. If, or if the decrease in diameter exceeds 7% of the nominal diameter, it can be determined experimentally beforehand, which address unit 24 of the wire rope 2 exceeds the wire rope replacement standard. It can be easily grasped. In Table 2, for example, the number of bends exceeds 400 times for light loads, the number of bends exceeds 300 times for medium loads, and the number of bends exceeds 200 times for heavy loads, for example, When an abnormal state or a life span such as a breakage of the wire rope 2 is reached, leading to a serious accident, the wire rope 2 needs to be replaced. For example, in Table 2, since the number of times of bending of the address L047 of the unit portion 24 exceeds 300 at medium load of the measurement point MP2, it can be seen that it is the replacement time. Further, by accumulating the number of times of bending at the number of bending times measurement points MP1, MP2, and MP3 for each unit portion 24 in a predetermined period, the wire rope 2 It is possible to easily predict which address unit 24 of the address exceeds the wire rope replacement standard, and a wire rope monitoring device can be realized very easily.
Next, display of the measured number of bendings will be described. FIG. 6 is a diagram showing a schematic configuration of the display unit 55 according to an embodiment of the present invention. The display unit 55 includes a control board 27, a 7-segment LED display 28, and switches 31, 32, 33, and 34. The 7-segment LED indicator 28 provided on the control board 27 has four 7-segment LEDs and can display a 4-digit number. The switches 31, 32, 33, and 34 are switches for operating display contents on the 7-segment LED display. The operation of the switches 31, 32, 33, and 34 will be described later with reference to FIG.

  Next, display contents will be described. FIG. 8 is a diagram for explaining display contents displayed on the display unit 55 according to an embodiment of the present invention. The display contents are classified into three categories, light load, medium load and heavy load, as described above, the number of bending occurrences by the drum 20 and the moving sheave 21 at each load, the total number of bending occurrences at each load, and each load. The total number of bending occurrences is shown by summing up the total number of bending occurrences. Here, the reason why the number of occurrences of bending of the drum 20 and the moving sheave 21 is measured separately is because the load applied to the wire rope 2 is different because the diameter of the drum 20 and the moving sheave 21 is different.

  The display content displayed on the display unit 55 includes an identification number 81, a display format A82, a display format B83, and a display content 84.

  The identification number 81 has 1 to 12, and roughly classified, 1 to 4 are the number of times of bending at the measuring point MP1 of the drum 20, and 5 to 8 are the number of times of bending of the moving sheave 21, for example, the number of times of bending at the measuring point MP2. , 9 to 11 are the total number of bending times by load, and 12 is the total number of bending times. Further, the number of bendings of the drums 1 to 4 is classified into three according to three types of loads, light load, medium load, and heavy load, and 4 indicates the total number of bendings. For example, the number of bending times measurement point MP2 of the moving sheave 21 of 5 to 8 is divided into three according to three types of loads of light load, medium load, and heavy load as in the case of the number of bending times of the drum 20 of 1-4. Has been. Note that, for example, the number-of-bends measurement point MP3 of the moving sheaves 21 of 5 to 8 can be switched and displayed as described later.

  In the display format A, display is performed using two (upper two digits) of the four 7-segment LEDs of the 7-segment LED display 28. In the first digit, one of the four characters “a, b, c, d” is displayed, “a” is drum 20, “b” is moving sheave 21, “c” is load-specific. Is shown. In the second digit, “-” is displayed at one of the three positions, upper, middle, and lower. “Up” is a light load, “Middle” is a medium load, and “Low” is a heavy load. Is shown.

  In the display format B, a 4-digit display is performed using all the four 7-segment LEDs of the 7-segment LED indicator 28. The number of bendings measured for each item is displayed by these four digits.

  Next, display of the number of bendings will be described. FIG. 7 is a diagram illustrating an example in which the number of bendings is displayed on the 7-segment LED display 28 according to an embodiment of the present invention. In FIG. 7, switches 31, 32, 33, and 34 correspond to the switches 31, 32, 33, and 34 shown in FIG. Any one of “addresses L001 to L100” of the unit 24 of the wire rope 2 is displayed on the 7-segment LED indicator 28 at the start of the operation. In this embodiment, the initial display of the unit portion 24 is “address L001”. In this state, the switch 33 is a switch that increases the address of the unit portion 24, and the switch 32 is a switch that decreases the address of the unit portion 24. For example, when it is desired to display “address L050” from the state of the address L001, the switch 33 is pressed 49 times. For example, in order to display “L001” from the state of “address L100”, the switch 33 may be pressed once. On the other hand, when returning the address, it can be displayed by pressing the switch 32 a predetermined number of times.

  Next, when the switch 34 is pressed in this state “address L050”, the display is switched to the display format A82 (shown in FIG. 8). In FIG. 7, a display format A82 with an identification number 81 of 1 is displayed, and the display content is “the number of times the drum 20 is bent (light load)”. Further, when the switch 34 is pressed from this state, “0300” is displayed on the 7-segment LED display 28. That is, it can be seen from this series of operations that “the number of times the drum 20 is bent (light load)” is “300”. Furthermore, when the switch 31 is pressed in this state “0300”, it is possible to return to the previous display.

  When the number of bendings is displayed on the 7-segment LED display 28, the number of bendings can be displayed in conjunction with the winding operation or the lowering operation. In this case, there is an effect that the unit part 24 can be directly confirmed at the time of inspection.

  FIG. 9 is a diagram for explaining an embodiment in which the number of bendings is displayed in conjunction with the hoisting operation or the unwinding operation of the embodiment of the present invention. FIGS. 9A to 9C are views showing a state in which the wire rope 2 around which the moving sheave 21 is wound is moved in order clockwise by the length of the unit portion 24 (winding operation). Moreover, FIG.9 (d)-(f) has shown the display of the 7 segment LED indicator 28 corresponding to FIG.9 (a)-(c), respectively. In FIG. 9A, since the position of the position display point DP1 is at the address L051, “L051” is displayed on the 7-segment LED display 28 in FIG. 9D. Similarly in FIGS. 9B and 9C, the addresses “L050” and “L049” at the position of the position display point DP1 are displayed on the 7-segment LED display 28. In this way, the total number of bendings of the unit portion 24 at the position display point 26 can be sequentially displayed on the 7-segment LED display 28 in conjunction with the winding operation or the lowering operation. It should be noted that when the operation is stopped, the unit 24 at the position display point DP1 is continuously displayed. By such a method, it can be known at a glance which position of the actual wire rope 2 is displayed, and can be easily confirmed. In addition, using data obtained by separately measuring the number of times of bending of the drum 20 and the moving sheave 21, it is possible to perform more intensive inspection when performing inspection work using the data of the number of bending times.

  As mentioned above, although this invention was demonstrated in detail, it cannot be overemphasized that this invention is not limited to the Example of the wire rope monitoring apparatus described here, It can apply also to another wire rope monitoring apparatus. .

1 is a perspective view showing an overall configuration of an inverter type crane apparatus according to an embodiment of the present invention. It is a block diagram which shows the structure of the principal part of the inverter type crane apparatus of one Example of this invention. It is a conceptual diagram which shows the principal part of the inverter type crane apparatus of one Example of this invention. It is a figure for demonstrating the measurement of the frequency | count of bending of one Example of this invention. It is a figure for demonstrating operation | movement of one Example of this invention. It is a figure which shows schematic structure of the display part of one Example of this invention. It is a figure for demonstrating the display of the frequency | count of bending of one Example of this invention. It is a figure for demonstrating the display content of one Example of this invention. It is a figure for demonstrating the display of the frequency | count of bending of other one Example of this invention.

Explanation of symbols

1: crane hook, 2: wire rope, 3: hoisting induction motor, 4: hoisting device, 5: traverse induction motor, 6: traversing device, 7: traversing girder, 8: travel induction motor, 9: Traveling device, 10: traveling girder, 11: hoisting and traverse inverter device, 12: hoisting and traversing inverter control unit, 13: operation input device, 14: hoisting inverter, 15: traverse inverter, 16: Brake for induction motor, 17: Inverter device for travel, 18: Travel inverter control unit, 19: Inverter for travel, 20: Drum, 21: Moving sheave, 22: Fixed sheave, 23: Fixed end of wire rope, 24: Unit 27: Control board, 28: 7-segment LED display, 31, 32, 33, 34: Switch, 51: Current measurement unit, 52 Load converting unit 52, 53: pulse generator 54: storage unit, 55: display unit.

Claims (7)

A wire rope wound between an upper pulley and a lower pulley to which a hook is attached; an induction motor that performs winding and unwinding operations of the wire rope; and a main control unit that controls the induction motor,
The main control unit includes a pulse generator that generates a predetermined pulse according to the rotation amount of the upper pulley, and a load conversion unit that measures a load attached to the hook from a current value of the induction motor,
The main control unit sets position information to each of a plurality of unit length wire ropes divided into predetermined lengths equal to or less than half the circumferential length of the lower pulley. In response to the information, the wire rope of the lower pulley comes into contact with the wire rope of the lower pulley and the wire rope of the lower pulley comes into contact with the wire rope of the upper pulley and the wire rope of the lower pulley comes into contact with the wire rope. Counting the number of times that each of the bending number measurement points located at a location is in contact with each of the plurality of unit length wire ropes in association with the number of pulses generated by the pulse generator, and obtained from the load conversion unit wire rope, characterized in that to monitor the life of the wire rope by measuring the load to be suspended on the hook of the lower pulley Visual apparatus. In the wire rope monitoring device according to claim 1,
Further, the main control unit includes a display unit,
The wire rope, wherein the display unit displays the positional information of the plurality of unit length wire ropes and the number of times the upper pulley and the lower pulley come into contact with each of the plurality of unit length wire ropes in association with each other. Monitoring device. In the wire rope monitoring device according to claim 1,
The number of times of bending of the upper pulley and the number of times of bending of the lower pulley are in contact with the plurality of unit length wire ropes when the unit length wire rope is on the number of bending times measurement point and the unit A wire rope monitoring device that counts to increase the number of times of contact when a long wire rope hangs on a bending frequency measurement point. In the wire rope monitoring device according to claim 1,
If the unit length wire rope is present on the same bending frequency measurement point even after being wound or unwound from a state of being positioned on the bending frequency measurement point of the upper pulley or the lower pulley, A wire rope monitoring device characterized by increasing the number of times of contact with a frequency measurement point by one. A wire rope wound between an upper pulley and a lower pulley to which a hook is attached; an induction motor that performs winding and unwinding operations of the wire rope; and a main control unit that controls the induction motor, The main control unit includes a pulse generator that generates a predetermined pulse according to a rotation amount of the upper pulley, and a wire including a load conversion unit that measures a load attached to the hook from a current value of the induction motor. In the rope monitoring method,
Dividing the wire rope into a predetermined length that is half or less than the circumference of the lower pulley; and associating position information with a plurality of unit length wire ropes divided into the predetermined length; Acquiring position information where the upper pulley and the lower pulley are in contact with each other, measuring a load suspended on the hook of the lower pulley by the load conversion unit, and according to rotation of the induction motor The number of times of bending positioned at a position where the wire rope of the upper pulley comes into contact with the wire rope and the position where the wire rope is bent and the number of times of bending positioned at the place where the wire rope of the lower pulley comes into contact with the wire rope Associating the number of times each measurement point contacts the plurality of unit length wire ropes with the number of pulses generated by the pulse generator And a step of counting, the load to be counted in the step of measuring the load to be suspended on the hook of the lower pulley, and the upper pulley and the lower pulley which is obtained in the step of counting by the pulse generator The wire rope monitoring method characterized by monitoring the life of the wire rope from the number of times of contact with the plurality of unit length wire ropes. In the wire rope monitoring method according to claim 5,
In the step, the unit length wire rope is on the bending number measurement point with respect to the number of times each of the bending number measurement point of the upper pulley and the bending number measurement point of the lower pulley is in contact with the plurality of unit length wire ropes. In this case, the wire rope monitoring method is characterized in that the number of contacts is counted to increase when the unit length wire rope hangs on a bending frequency measurement point. In the wire rope monitoring method according to claim 5,
In the step, when the unit length wire rope is on the same bending number measuring point after being wound or unwound from the state of being positioned on the bending number measuring point of the upper pulley or the lower pulley. Is a wire rope monitoring method characterized by increasing the number of times of contact with a bending frequency measurement point by one.

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