JP2010180001A - Working status management device for crane, and crane equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working status management device for a crane capable of obtaining information required for accurately speculating the life of the crane according to its working status considering a loading rate, the number of operations, and an operating time thereof, and to provide the crane equipped with the working status management device. <P>SOLUTION: The working status management device for the crane identifies a corresponding one of a plurality of pre-set load zones based on load information at a lifted load provided for the crane, counts the number of operations of the lifted load for each identified load zone, integrates an operating time for each identified load zone, and stores the obtained number of operations and the operating time for each load zone. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an operation status management apparatus for managing the operation status of a crane and a crane including the same.

  The crane is designed with a predetermined life expectancy. For example, a hoist type crane is usually designed on the basis of a standard operating situation and assuming a lifetime (lifetime) of about 10 years with an annual operating day of 250 days. However, it is known that the life of a crane is determined by the load condition, that is, the load ratio that is the ratio of the load used during operation, the number of operations and the operation time, etc. when the deterioration factors are the same. (See Patent Documents 1 to 3 below).

  Therefore, depending on the state of the load, the assumed life of the crane may be extended or may be shortened.

  FIG. 15 is a diagram illustrating an example of the relationship between the load factor and the operation time as the operating status of the hoist type crane, and FIGS. 15A to 15D show the operations in the model examples 1 to 4, respectively. It is the graph which showed the ratio of the load factor with respect to time.

  Model example 1 shown in FIG. 15 (a) is an example of an operating situation in light work, and the rated load is suspended at a frequency of 10% or less, and the overall load factor is 0.5 or less. This model example 1 is an example corresponding to, for example, a warehouse or a factory with low usage frequency. Model example 2 shown in FIG. 15 (b) is an example of the operation status in the middle work, and shows an example of carrying a load having a wide range of weight in addition to the rated load. 63. This model example 2 is an example corresponding to a factory with relatively high use frequency, for example. Model example 3 shown in FIG. 15C is an example of an operating state in heavy work, where the rated load is hung at half the frequency, and the overall load factor is 0.8. This model example 3 is an example corresponding to a factory such as an automobile factory where heavy work is performed at a considerably high frequency. Further, model example 4 shown in FIG. 15 (d) is an example of an operating state in super heavy work, and is used in a state where the rated load is almost always suspended, and the overall load factor is approximately 1.0. . This model example 4 is an example corresponding to a case where a lifting magnet or the like is lifted and the vehicle is always operated up and down.

  In this way, since the load conditions vary depending on the user's usage conditions, the crane's life will operate if the operating conditions such as the load factor and the number of operations and operation time of the crane used are not grasped in detail. It cannot be accurately estimated according to the situation.

  In the following Non-Patent Document 1, the load factor and the number of operations are divided as shown in Tables 1 to 3 below, or the load factor and the operation time are divided as shown in Tables 4 to 6 below. Thus, the grade is determined for the operation status of the crane (see Non-Patent Document 1 below).

  In this regard, there has been proposed a history display device that measures the number of operations and the operation time of the hoisting / lowering operation of the electric chain block and displays the total number of operations and the total operation time on the display unit (see Patent Document 4 below). .

  However, although the history display device described in Patent Document 4 can grasp the total number of operations and the total operation time of the hoisting and lowering operations, it cannot grasp the state of the load. It cannot be accurately estimated according to the operating conditions such as operating time.

  Further, the conventional crane has the following disadvantages. That is, in recent years, the lifting motor has been increasingly driven by an inverter in addition to being driven by a commercial power source.

  In general, when a load is detected, a current flowing through a lifting motor driven by a commercial power source is detected by a current sensor, and the load is detected based on the detected current value. For this reason, when the lifting motor is driven by an inverter, it is difficult to detect the load.

  The conventional crane also has the following inconvenience. That is, in the conventional crane, when the lifting operation is performed, when a load greater than a preset operation set load is applied to the load detected by the current flowing through the lifting motor, the lifting operation is stopped. A load limiter function may be provided, but in this case, the operation set load is set by an input operation by the operator (for example, the rotation button operation of the setting volume). It took time.

JP 2001-89073 A JP 2001-89074 A JP 2001-89075 A Japanese Patent No. 3256778

ISO 4301-1, Cranes and lifting appliances-Classification-Part 1: General 1986 2nd edition

  Therefore, the present invention provides a crane operation status management device capable of obtaining information necessary for accurately estimating the life of a crane in accordance with the operation status in consideration of the load factor, the number of operations and the operation time thereof, and the same. It is an object to provide a crane equipped.

  Further, the present invention is a crane operating state management device having a load limiter function and a crane equipped with the same, and when setting the operation set load in the load limiter function, the setting work is facilitated and the set work time is reduced. Still another object of the present invention is to provide a crane operating condition management device that can be shortened and a crane equipped with the same.

  In order to solve the above-described problems, the present invention provides operation status management apparatuses according to the following first and second aspects.

(1) Operation status management device according to the first aspect For each load factor corresponding to load information at the suspended load portion provided in the crane, the number of operations of the suspended load portion is counted and the operation time of the suspended load portion is integrated. And the operating condition management apparatus of the crane characterized by comprising so that the obtained operation frequency and operation time might be preserve | saved for every said load factor.

  Here, the “load factor” is a concept including not only an actual load factor value but also a value corresponding to the actual load factor (a value correlated with the load factor). Further, as a mode for obtaining a load factor corresponding to the load information, a mode in which the load information is temporarily converted into a load by a conversion table or the like, and a load factor is obtained based on the converted load, a conversion table from the load information, or the like. Thus, it is possible to exemplify a mode of converting directly to a load factor.

  In the operation status management device according to the first aspect of the present invention, for each load factor corresponding to the load information, the number of operations of the suspended load part is counted and the operation time of the suspended load part is integrated, and obtained. The number of operations and the operation time are stored for each load factor. Thereby, for example, by reading and outputting the stored number of operations and operation time, it is possible to grasp the number of operations and operation time of the suspended load part for each load factor.

(2) Operation status management device according to the second aspect Load classification determination means for determining which of a plurality of preset load classifications is applied based on load information at a suspended load portion provided in the crane , A load-part count count unit that counts the number of operations of the suspended portion for each load category determined by the load category determination unit, and a load-unit count unit for each load category determined by the load category determination unit. The time accumulation means for each load category for accumulating the operation time, the number of operations counted by the number counting means for each load category, and the operation time accumulated by the time division means for each load category are stored for each load category. A crane operating condition management device comprising storage means for each load category.

  In the operation status management device according to the second aspect of the present invention, based on the load information, the load classification determining means determines which of the plurality of load classifications corresponds. In addition, the number of operations of the suspended load part is counted by the number-of-load-count counting unit for each determined load category, and the operation time of the suspended load part is determined for each determined load category by the load category-specific time. Integration is performed by the integration means. Then, the counted number of operations and the accumulated operation time are stored for each load category by the load category storing means. Accordingly, for example, by further providing an output means for reading out and outputting the number of operations and the operation time stored in the storage unit for each load category, the number of operations and the operation time of the suspended load part are grasped for each load category. be able to. Here, for example, the output unit may be configured to read out the number of operations and the operation time stored in the load classification storage unit and record them in a recording medium such as an IC memory.

  Therefore, according to the operation status management device of the first aspect and the second aspect according to the present invention, in order to accurately estimate the life of the crane according to the operation status in consideration of the load factor, the number of operations and the operation time thereof. Necessary information can be obtained. For example, the preventive maintenance of the crane can be reliably performed by utilizing the number of operations and the operation time of the suspended load portion read out for each load rate and each load category. Specifically, it is possible to assume the replacement time of the replacement part or to confirm whether or not the use is suitable for the grade.

  As said load information, the information from load detection means, such as a detection sensor which detects the load in the said hanging load part, can be illustrated.

  In this invention, you may further provide the load detection means which detects the load information in the suspended load part provided in a crane as a load. In this case, in the second aspect, the load classification determination unit can determine which of the plurality of load classifications corresponds to the load detected by the load detection unit.

  Here, the above-mentioned “detect load information as a load” is not only a case where an actual load value is detected, but also a value corresponding to an actual load value (correlation with an actual load value). This is a concept that includes the case of detecting a value) having a load as a load. For example, the case where the rated load information is 100% and the ratio of the load information is detected as a load can be mentioned.

  In the present invention, the following embodiments (a) to (c) and embodiments obtained by combining at least two of the embodiments (a) to (c) can be exemplified.

  That is, in the aspect of (a), in the first aspect, for each load factor, two types of operation counts are counted, that is, the number of ground cuttings and the number of upward movements of the suspended load part, and the two types of operation counts are counted. In doing so, when the load factor is different from the previous load factor, both the number of times of ground cutting and the number of upper movements are counted, and when the load factor is the same as the previous load factor, only the number of upper movements is counted. To do. Moreover, in the aspect of (a), in the second aspect, the number-of-times-by-load-counting unit counts the number of ground cuttings and the number of up motions of the suspended load part for each load class determined by the load class determining unit. Two types of operations are counted. When the two types of operations are counted, when the load classification determined by the load classification determination means is different from the previous load classification, Both the number of up motions are counted, and when the load category determined by the load category discrimination means is the same as the previous load category, only the number of up motions is counted.

  In this specific matter, by counting the number of times of ground cutting and the number of upward movements separately, for example, the number of ground cuttings and the number of upward movements are estimated for structural parts related to the crane's structural system, respectively. It can be used to calculate the service life and the estimated service life of the mechanical parts related to the mechanical system of the crane.

  In the aspect of (b), it is configured to detect a voltage value as the load information, and when the hoisting motor provided in the crane is driven by a commercial power source, the hoisting motor is operated by a current sensor. The load current flowing through the upper motor is converted to voltage, and when the lifting motor provided in the crane is driven by an inverter, the torque output voltage output from the inverter is detected. . For example, when the load detection unit is provided, the load detection unit is configured to detect a voltage value as the load information, and when the lifting motor is driven by a commercial power source, When the load current flowing through the lifting motor is converted into a load voltage by a sensor, the torque output output from the inverter is detected when the lifting motor is driven by the inverter. The voltage may be detected as a load.

  In this specific matter, since the voltage value is detected as the load information, the load current is converted into the load voltage by the current sensor when the lifting motor is driven by a commercial power source. By detecting the object (for example, as a load), not only can it be used for a commercially driven crane, but also the torque output voltage can be detected (for example, the load) when the lifting motor is driven by an inverter. It is possible to correspond to a crane driven by an inverter. Therefore, the operation status management device can be used in common in the case of commercial driving and the case of inverter driving.

  In the aspect (b), when the lifting motor is driven by the inverter at a plurality of different speeds, the torque output voltage may differ depending on the speed even with the same load.

  In this case, when the lifting motor is driven by the inverter at a plurality of different speeds, it is preferable to detect the torque output voltage according to the plurality of speeds. For example, when the load detection unit is provided, the load detection unit is configured to output the torque output voltage according to the plurality of speeds when the lifting motor is driven by the inverter at a plurality of different speeds. May be converted as a load.

  In the aspect (c), when a load greater than or equal to a preset operation set load is applied to the load information or a load exceeding the set operation load is applied, or a value corresponding to the load information is set in advance. A load limiter actuating means is further provided for stopping the upper operation when a load greater than or equal to the operation set load is applied. For example, when the load detecting means is provided, the load limiter operating means is applied with a load greater than or equal to a preset operation set load with respect to the load detected by the load detecting means. The upper operation may be stopped.

  In this specific matter, since the load limiter operation is performed using the load information or a value corresponding to the load information (for example, the load detected by the load detecting means), it is not necessary to provide a separate load limiter function, and the cost is increased accordingly. Reduction can be achieved.

  In the aspect of (c), the apparatus further includes automatic setting means for setting the load information based on the load or a value corresponding thereto as the operation set load by lifting a load to be set as the operation set load. Is preferred. For example, when the load detecting means is provided, the automatic setting means sets the load detected by the load detecting means as the operation set load by lifting a load to be set as the operation set load. Good.

  In this specific matter, the load to be set for the operation set load is simply lifted without performing the complicated setting work such as setting the operation set load by the input operation of the setting volume by the operator as in the prior art. The load information or the value corresponding to the load (for example, the load of the load) can be set as the operation set load, thereby facilitating setting work and setting work time in setting the operation set load. Can be shortened.

  Moreover, this invention respond | corresponds when the load more than the operation setting load preset with respect to the load information in the hanging load part provided in a crane, or the load exceeding this operation setting load is applied, or the said load information When a load greater than or equal to the preset operating set load is applied to the value, or a load exceeding this set operating load is applied, the load limiter operating means for stopping the upper operation and the load to be set as the operating set load are lifted Thus, there is also provided a crane operating condition management device comprising automatic setting means for setting the load information by the load or a value corresponding thereto as the operation setting load.

  The operation status management apparatus further includes load detection means for detecting load information at a suspended load portion provided in the crane as a load, and the load limiter operating means is configured to pre-load the load detected by the load detection means. When a load greater than or equal to the set operation set load is applied, the upper operation is stopped, and the automatic setting means lifts the load to be set to the set operation load, You may set the load of the load detected by the load detection means as said operation | movement setting load.

  Even in this operation status management device, the load to be set as the operation set load is simply lifted without performing the complicated setting work such as setting the operation set load by the input operation of the setting volume by the operator as in the prior art. The load information based on the load or a value corresponding to the load information (for example, the load of the load) can be set as the operation setting load, thereby facilitating setting work in setting the operation setting load and It is possible to shorten the setting work time.

  By the way, as described above, when the lifting motor is driven by the inverter at a plurality of different speeds, the torque output voltage may be different depending on the speed even with the same load.

  For this reason, it is comprised so that a voltage value may be detected as said load information, and when the hoisting motor provided in the said crane is driven with a commercial power source, it is made to the said hoisting motor with an electric current sensor. When the load current flowing into the voltage is detected and the lifting motor provided in the crane is driven by an inverter, the torque output voltage output from the inverter is detected, and the crane When the lifting motor provided is driven by the inverter at a plurality of different speeds, the torque output voltage is detected according to the plurality of speeds, and the automatic setting means detects the detected value or It is preferable to set a corresponding value for each of the plurality of speeds as the operation set load. For example, when the load detecting means is provided, the load detecting means is configured to detect a voltage value as the load information, and a lifting motor provided in the crane is driven by a commercial power source. In the case where a load is detected by converting a load current flowing through the lifting motor into a voltage with a current sensor, and the lifting motor provided in the crane is driven by the inverter, the inverter In the case where the torque output voltage output from the motor is detected as a load and the lifting motor provided in the crane is driven by the inverter at a plurality of different speeds, the load detection means Accordingly, the output voltage for torque is converted as a load, and the automatic setting means sets the load of the load as the operation set load for each of the plurality of speeds. It may be.

  Further, in the case where the load limiter operating means is provided, it further comprises a manual setting means for setting the operation setting load by an input operation of an operator, and the manual setting means obtains the load information obtained immediately before or a value corresponding thereto. It is preferable to display. For example, when the load detection unit is provided, the manual setting unit may display the load detected immediately before by the load detection unit.

  This specific matter is particularly effective when the operation set load is set with respect to the lifted load by the operator's input operation after the load to be set as the operation set load is lifted.

  The present invention also provides a crane including the crane operating condition management device according to the present invention.

  As described above, according to the present invention, the crane operation status management that can obtain information necessary for accurately estimating the life of the crane according to the operation status in consideration of the load factor, the number of operations and the operation time. A device and a crane equipped with the device can be provided.

  In addition, when setting the operation set load in the load limiter function, it is also possible to provide a crane operating state management device that can facilitate setting work and shorten the setting work time, and a crane including the same.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows roughly the system configuration | structure of the operating condition management apparatus which concerns on one Embodiment of this invention, Comprising: FIG. (A) is a figure in the case of a commercial drive, FIG. FIG. It is a figure which shows notionally the schematic structure of the control part in the operating condition management apparatus shown in FIG. It is a conceptual diagram which shows the operation | movement image by the control part in the operating condition management apparatus shown in FIG. It is a schematic plan view which shows the operation input part and display part of the operation condition management apparatus shown in FIG. 4 is a flowchart of a control example in a normal mode A. It is a figure which shows the subroutine of the load classification discrimination | determination count processing in the flowchart shown in FIG. It is a figure which shows the subroutine of the load classification discrimination | determination time integration process in the flowchart shown in FIG. 7 is a flowchart of a control example in a normal mode B. It is a flowchart of the example of control in test mode. 5 is a flowchart of a control example in a setting mode A. FIG. 8A is a diagram showing an example of setting of the operation set load in the setting mode B, and FIG. 9A is a diagram showing a state in which the load detected most recently and the current set load are displayed on the display unit. (b) is a figure which shows the operation state before the setting load displayed on the display part is changed, (c) is a figure which shows the state in which the setting load displayed on the display part is changed. It is a figure which shows the example of a display of the frequency in frequency | count confirmation mode. It is a figure which shows the example of a display of time in time confirmation mode. It is a figure which shows the recording list which records the various data displayed on the display part for every date. It is a figure which shows the example of the relationship between a load factor and operation time as an operating condition of a hoist type crane, Comprising: The figure (a) to the figure (d) are the ratios of the load factor with respect to the operation time in the model examples 1-4, respectively. It is the graph which showed.

  Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not.

  FIG. 1 is a block diagram schematically showing the system configuration of an operation status management apparatus 100 according to an embodiment of the present invention. FIG. 1 (a) shows a diagram in the case of commercial driving. 1 (b) shows a diagram in the case of inverter driving. FIG. 2 is a diagram conceptually illustrating a schematic configuration of the control unit 110 in the operation status management apparatus 100. FIG. 3 is a conceptual diagram showing an operation image by the control unit 110 in the load monitor 100 shown in FIG.

  An operation status management apparatus (hereinafter referred to as a load monitor) 100 shown in FIG. 1 records and saves an operation history of the crane 200.

  The load monitor 100 can be applied to any crane regardless of the type of crane. Examples of the crane that can be applied to the load monitor 100 include, but are not limited to, an overhead crane, a movable crane, a tower crane, a bridge crane, and the like. In the present embodiment, a case where the load monitor 100 is mounted on a hoist crane 200 having a hoist 210 will be described as an example.

  The hoist 210 includes a suspended load part 211 for suspending a load, and a hoisting motor (an example of a lifting motor) 212 that performs a hoisting operation and a lowering operation of the hoisting load part 211. The hoisting motor 212 is driven by a commercial power supply G1 (see FIG. 1A) or an inverter G2 (see FIG. 1B). When the hoisting motor 212 is driven by the commercial power supply G1, the current Id flowing through the hoisting motor 212 is detected by the current sensor 220 and converted to a load voltage (load determination signal) Vd. It has become so.

  The hoisting motor 212 is driven at one stage speed or a plurality of stage speeds (generally two stage speeds in the case of a plurality of stage speeds). Here, when the hoisting motor 212 is driven by the commercial power source G1 (hereinafter simply referred to as commercial driving), the hoisting motor 212 is driven at the first speed (a constant speed of the first stage speed), while the inverter G2 Are driven at two speeds (high speed and low speed). In the case of inverter drive, the inverter G2 outputs a torque command signal related to the torque of the high-speed hoisting motor 212 as a high-speed torque output voltage (load determination signal) Vt (Vt ′). The torque command signal relating to the torque of the hoisting motor 212 at low speed is output as the torque output voltage Vt (Vt ″) at low speed.

  In addition, the crane 200 further includes a hoisting operation switch 230 a that performs the hoisting operation of the hoisting load part 211 by the hoisting motor 212, and an unwinding operation that lowers the hoisting load part 211 by the hoisting motor 212. And a switch 230b.

  The load monitor 100 includes a control unit 110. The input terminal 111 of the control unit 110 has a load voltage Vd from the current sensor 220 or a torque output voltage Vt from the inverter G2, a hoisting signal Va from the hoisting operation switch 230a, and an output from the hoisting operation switch 230b. A lowering signal Vb is input. As described above, the torque output voltage Vt is Vt ′ in the case of high speed driving and Vt ″ in the case of low speed driving.

  In the present embodiment, a first speed determination signal Vm1 of the hoisting motor 212 and a second speed determination signal Vm2 of the hoisting motor 212 are further input to the input terminal 111. . When the first and second speed determination signals Vm1 and Vm2 are used for commercial driving, both the first speed determination signal Vm1 and the second speed determination signal Vm2 are used as commercial driving determination signals. When used for driving commercial drive, both the first speed determination signal Vm1 and the second speed determination signal Vm2 are inverter drive high speed determination signals, and only the first speed determination signal Vm1 is an inverter drive low speed determination signal. It is said.

  In the present embodiment, the output terminal 112 of the control unit 110 is provided with a load limiter operation output terminal 112a to which an operation line for a load limiter function described later is connected. Here, the output terminal 112 defines the load limiter function terminal 112b for notifying the outside (for example, the crane body) that the load limiter function has been activated, and the number of data writes to the internal memory 140 as will be described later. There is further provided a recommended replacement time output terminal 112c for notifying the outside (for example, the crane body) that the number of times has been exceeded (that is, the load monitor 100 has reached the recommended replacement time).

  The control unit 110 includes a processing unit 120 such as a CPU (Central Processing Unit) and a storage unit 130. The storage unit 130 includes storage means such as a ROM (Read Only Memory) and a RAM (Random Access Memory), and stores a control program, necessary functions and tables, and processing data.

  As shown in FIG. 2, the storage unit 130 includes a plurality (five here) of load categories P0 each corresponding to a load category 0 to a load category 5 in which the load factor is defined in a plurality of ranges (here, five). ~ P5 are preset. The load categories P0 to P5 are values determined in advance according to the rated load of the crane 200 on which the load monitor 100 is mounted. For example, the load sections P0 to P5 can be values obtained by multiplying the load sections 0 to 5 by the rated load of the crane to which the load monitor is to be mounted.

  Load category 0 corresponds to no load. That is, the load category 0 is a category when there is no load. Here, each of the load categories 1 to 5 is a category when the load factor is greater than 0% and less than 50%, a category when the load factor is 50% or more and less than 63%, and a load factor of 63% or more and less than 80%. , When the load factor is 80% or more and 100% or less, and when the load factor exceeds 100%.

  In addition, the storage unit 130 is provided with a category-specific operation count storage region 131 and a category-specific operation time storage region 132. The operation count storage area 131 for each category is an area for storing the operation counts U0 to U5 during the hoisting operation of the suspended load part 211 in correspondence with the load categories P0 to P5 (that is, the load categories 0 to 5). The section-specific operation time storage area 132 associates load section-specific operation times T0 to T5 during the hoisting operation and the unwinding operation of the suspended load part 211 with the load sections P0 to P5 (that is, the load sections 0 to 5). This is the area to be stored. Hereinafter, the load sections P0 to P5 may be simply referred to as load sections 0 to 5.

  In the present embodiment, the number-by-section operation frequency storage area 131 associates the number of initial movements (no load) Ua0 and the number of ground cuttings Ua1 to Ua5 with the load categories 0 to 5 during the hoisting operation of the suspended load part 211. It consists of a ground cutting number storage area 131a for storing and an upper operation number storage area 131b for storing the upper movement counts Ub0 to Ub5 at the time of the hoisting operation of the suspended load part 211 in correspondence with the load categories 0 to 5.

  The control unit 110 is configured to control the entire load monitor 100 by reading the control program from the storage unit 120 by the processing unit 120 and executing the read control program.

  Specifically, the control program includes a processing unit 120, a load detection unit M1, a load category determination unit M2, a load category count counter M3, a load category time integration unit M4, and a load category storage unit M5. It is made to function as a means including.

  The load detection means M1 detects load information during the hoisting operation of the suspended load part 211 by the hoisting motor 212 as the load Pf.

  In the present embodiment, the load detection means M1 is configured to detect an analog voltage value as the load information. In the case of commercial driving, the load detection means M1 detects the load voltage Vd converted from the load current Id by the current sensor 220 as the load Pf. In the case of inverter driving, the load detection means M1 detects the torque output voltage Vt output from the inverter G2 as the load Pf.

  In the present embodiment, in the case of inverter driving, the load detection means M1 outputs the torque output voltages Vt ′ and Vt ″ at high speed and low speed according to the two speeds of high speed and low speed, respectively. It is supposed to convert to.

  Specifically, the storage unit 120 is further provided with a conversion table TB. The conversion table TB stores a plurality of loads each corresponding to a voltage category into a plurality of load discrimination signals such as the load voltage Vd and the torque output voltage Vt. Here, the conversion table TB includes a first conversion table TBa for commercial driving and high-speed inverter driving, and a second conversion table TBb for driving low-speed inverters.

  Specifically, the first conversion table TBa is used for commercial drive and high-speed inverter drive. In the case of commercial drive, the first conversion table TBa is a table for converting the load voltage Vd into the load Pf. Is a table for converting the torque output voltage Vt ′ at high speed into the load Pf. The second conversion table TBb is used in the case of low-speed inverter driving, and is a table for converting the torque output voltage Vt ″ at low speed into the load Pf.

  In the case of commercial driving, the load detection means M1 converts the load Pf corresponding to the load voltage Vd in the voltage classification stored in the first conversion table TBa. In the case of inverter driving, the load detection means M1 converts to a load Pf corresponding to the high-speed torque output voltage Vt ′ in the voltage section stored in the first conversion table TBa in the case of high speed, while the low speed. In this case, the load Pf is converted to the torque output voltage Vt ″ at low speed in the voltage section stored in the second conversion table TBb.

  Note that the load detection means M1 does not detect the load Pf during a predetermined mask time Tm (see FIG. 3) from the start of winding because the load Pf is not accurately detected at the initial stage of winding. Here, the conversion table is used to detect the load Pf from the load voltage Vd or the torque output voltages Vt ′ and Vt ″. However, the conversion table is not limited to this. For example, a conversion formula corresponding to the conversion table is used. Also good.

  The load classification determination means M2 corresponds to any of the load classifications P0 to P5 (that is, the respective load classifications 0 to 5) preset in the storage unit 130 based on the load Pf detected by the load detection means M1. It is to determine whether to do. Specifically, the load category determination means M2 determines the number of operations corresponding to the load Pf in the load categories P0 to P5 (that is, the load categories 0 to 5) in the category-specific operation count storage area 131 and the load in the category-specific operation time storage area 132. The operation time for each load category corresponding to the load Pf in the segments P0 to P5 (that is, the load categories 0 to 5) is selected.

  Specifically, the load classification determination means M2 includes the number of initial movements corresponding to the load Pf in the load classifications P0 to P5 (that is, the load classifications 0 to 5) in the ground cutting frequency storage area 131a in the operation count storage area 131 for each classification. Alternatively, the number of times of ground cutting and the number of times of the upper motion corresponding to the load Pf in the load categories P0 to P5 (that is, the load categories 0 to 5) in the upper motion count storage area 131b are selected.

  In this example, the load information is temporarily converted into a load, and the obtained load is determined as one of a plurality of load categories. However, by appropriately setting the values of the plurality of load categories, the load information can be directly determined from the load information. You may make it discriminate | determine in any of several load classifications.

  Further, instead of the load sections P0 to P5, the load sections 0 to 5 are set in advance in the storage unit 130, and the rated load Pmax of the crane is set in advance to be changeable and detected by the load detecting means M1. The ratio of the load Pf to the rated load Pmax may be calculated as the load factor P. In this case, the load classification determination unit M2 can determine which of the load classifications 0 to 5 preset in the storage unit 130 corresponds to the calculated load rate P.

  The number-of-times-by-load count counting means M3 counts the number of times U0-U5 by load category for each load category 0-5 determined by the load category determination means M2. Specifically, the load category count count means M3 adds 1 count to the operation count selected from the category-specific operation count storage area 131 by the load category discrimination means M2.

  Specifically, the number-of-times-counting means M3 for each load category obtains the number of initial movements Ua0, the number of times of ground cutting Ua1 to Ua5, and the number of times of upward movement Ub0 to Ub5 for each load category 0 to 5 determined by the load category determination means M2. To count. When the load classification determined by the load classification determination means M2 is different from the previous load classification, the number-of-times-by-load count counting means M3 and the number of initial movements Ua0 and the number of ground cuttings Ua1 to Ua5 and the number of upper movements Ub0 to Ub5 When the load classification determined by the load classification determination means M2 is the same as the previous load classification, the number of up movements Ub0 to Ub5 is counted.

  The load category time integration means M4 integrates the load category operation times T0 to T5 for each of the load categories 0 to 5 determined by the load category determination means M2. Specifically, the load category time integration means M4 measures the winding time Ta from the start of winding of the winding operation switch 230a to the stop of winding based on the presence or absence of the winding signal Va and the winding of the winding operation switch 230b. The lowering time Tb from the lower start to the lowering stop is measured based on the presence or absence of the lowering signal Vb, and the obtained hoisting time Ta and the lowering time Tb are stored in the operation time storage area for each category by the load classification discriminating means M2. The operation time for each load category selected from 132 is integrated.

  The hoisting time Ta accumulated by the load classification time accumulating means M4 is a time excluding the mask time Tm here.

  Here, the storage areas 131 and 132 are storage registers (volatile memory) for temporarily storing data. Therefore, the storage unit 130 is provided with an internal memory (nonvolatile memory) 140 that holds temporarily stored data. The internal memory 140 can store data temporarily stored in the storage areas 131 and 132. The same applies to storage areas 133 to 135 described later. This storage timing will be described later.

  The load classification storing means M5 includes the load classification operation counts U0 to U5 counted by the load classification count counting means M3 and the load classification operation times T0 to T5 integrated by the load classification time integration means M4. It saves every load classification 0-5. More specifically, the load classification storing means M5 includes the load classification operation times U0 to U5 in the load classification in the classification operation frequency storage area 131 and the load classification operation times T0 to T5 in the load classification in the classification operation time storage area 132. T5 is stored in the internal memory 140.

  Specifically, the load classification-specific storage means M5 includes the initial movement count Ua0 and the ground movement counts Ua1 to Ua5 in the load classification of the ground cutting frequency storage area 131a, and the upper movement frequency storage area. The number of upper movements Ub0 to Ub5 in the load category 131b is stored in the internal memory 140.

  In the present embodiment, the load monitor 100 further includes an operation input unit 150 that can be operated by an operator and an output unit 160 such as a display unit.

  The control program causes the processing unit 120 to function as means further including output means M6.

  The output means M6 reads out and outputs the operation numbers U0 to U5 for each load category and the operation times T0 to T5 for each load category stored by the load category storage means M5 for each load category 0 to 5. In detail, the output means M6 includes the operation numbers U0 to U5 classified by load classification stored in the internal memory 140 (here, the initial movement count Ua0 and the ground movement counts Ua1 to Ua5, the upper movement count Ub0 to Ub5), and the operation according to load classification. Times T0 to T5 are read for each load category 0 to 5 and output to the output unit 160.

  Examples of the output unit 160 include a display unit such as a display panel and a printing unit such as a printer. Here, the output unit 160 is a display unit, and can display the number of operations Ua0 to Ua5, Ub0 to Ub5 and the operation times T0 to T5 for each load category 0 to 5.

  Furthermore, in the present embodiment, the operation setting load Ps used in the load limiter function is set in the storage unit 130 in advance.

  The control program causes the processing unit 120 to function as means further including load limiter operating means M7 that operates the load limiter function.

  The load limiter actuating means M7 stops the hoisting operation when the load Pf detected by the load detecting means M1 exceeds or exceeds the preset operation set load Ps. Specifically, the load limiter operating means M7 operates the load limiter function when the load Pf detected by the load detecting means M1 exceeds or exceeds the operation set load Ps preset in the storage unit 130. Then, the operation of the hoisting motor 212 is stopped.

  In the present embodiment, the control program causes the processing unit 120 to function as means further including automatic setting means M8.

  The automatic setting unit M8 sets the load Pf of the load detected by the load detection unit M1 as the operation setting load Ps by lifting the load to be set to the operation setting load Ps. Specifically, the automatic setting unit M8 updates and sets the load Pf of the load detected by the load detection unit M1 with respect to the operation setting load Ps set in the storage unit 130.

  In the present embodiment, when the hoisting motor 212 provided in the crane 200 is driven by the inverter G2 at a two-stage speed, the automatic setting means M8 sets the load Pf as the operation setting load Ps to 2 It is set for each speed of the stage. Specifically, the operation setting load Ps stored in the storage unit 130 is composed of a high-speed operation setting load Ps ′ and a low-speed operation setting load Ps ″. In this case, the load Pf of the load detected by the load detecting means M1 is updated and set to the high-speed operation setting load Ps ′ set in the storage unit 130, while in the case of low-speed driving, the load is stored in the storage unit 130. The load Pf of the load detected by the load detecting means M1 is updated and set with respect to the set operation setting load Ps "for low speed.

  Furthermore, in the present embodiment, the control program causes the processing unit 120 to function as means further including manual setting means M9.

  The manual setting means M9 sets the operation setting load Ps by an operator input operation. Then, the manual setting unit Ps displays the load Pf detected immediately before by the load detection unit M1 on the display unit 160 as a default value.

  The storage unit 130 further includes an upper activation number storage area 133 and an operation time storage area 134. The upper activation number storage area 133 is an area for storing the upper activation number Uc, which is the total number of times that the hoisting portion 211 has been wound. The operation time storage area 134 is a total time of the total winding time from the start of the hoisting operation to the stop of the hoisting operation and the total lowering time from the start of the lowering operation to the stop of the hoisting operation with respect to the suspended load part 211 This is an area for storing the operation time Tc.

  The control program causes the processing unit 120 to function as means further including an upper activation number counting means M10 and an operation time integrating means M11.

  The upper activation number counting means M10 counts the upper activation number Uc. Specifically, the upper activation number counting means M10 detects the presence / absence of operation of the hoisting operation switch 230a based on the presence / absence of the hoisting signal Va, and stores it in the upper activation number storage area 133 when the hoisting operation switch 230a is operated. One count is added to the upper activation count Uc.

  The operation time integration means M11 integrates the operation time Tc. Specifically, the operation time integrating means M11 measures the winding time Ta from the start of winding of the winding operation switch 230a to the stop of winding based on the presence / absence of the winding signal Va, and starts the lowering of the winding operation switch 230b. Is measured based on the presence or absence of the lowering signal Vb, and the obtained winding time Ta and lowering time Tb are added to the operation time Tc recorded in the operation time storage area 134. .

  Here, the winding time Ta accumulated by the operation time integrating means M11 is a time excluding the mask time Tm.

  The storage unit 130 is further provided with a load limiter operation frequency storage area 135 for storing a load limiter operation frequency Ud, which is the number of times the load limiter function is operated.

  The control program causes the processing unit 120 to function as means further including load limiter operation frequency counting means M12.

  The load limiter operation frequency count means M12 counts the load limiter operation frequency Ud. Specifically, the load limiter operation number counting means M12 adds 1 count to the load limiter operation number Ud stored in the load limiter operation number storage area 135 when the load limiter function is operated.

  The control program causes the processing unit 120 to function as means further including data storage means M13.

  The data storage unit M13 stores the upper activation number Uc counted by the upper activation number counting unit M10 and the operation time Tc accumulated by the operation time accumulation unit M11. Specifically, the data storage unit M13 stores the upper activation count Uc in the upper activation count storage area 133 and the operation time Tc in the operation time storage area 134 in the internal memory 140.

  The output means M6 further reads out and outputs the upper activation count Uc and the operation time Tc stored by the data storage means M13. Specifically, the output means M6 further reads the upper activation count Uc and the operation time Tc stored in the internal memory 140 and displays them on the display unit 160.

  The data storage unit M13 stores the load limiter operation frequency Ud counted by the load limiter operation frequency count unit M12. Specifically, the data storage unit M13 stores the load limiter operation count Ud in the load limiter operation count storage area 135 in the internal memory 140.

  The output means M6 further reads and outputs the load limiter operation count Ud stored by the data storage means M13. Specifically, the output unit M6 further reads out the load limiter operation count Ud stored in the internal memory 140 and displays it on the display unit 160.

  The internal memory 140 is provided with an internal memory write count storage area 141 for storing the data write count Ue, which is the number of times data is written to the internal memory 140, and a prescribed count indicating the recommended replacement time of the apparatus. Uf is stored in advance.

  The control program causes the processing unit 120 to function as means further including internal memory write count counting means M14 and recommended replacement time output means M15.

  The internal memory write count counting means M14 counts the data write count Ue. Specifically, the internal memory write count counting means M14 adds 1 count to the data write count Ue stored in the internal memory write count storage area 141 when data is written to the internal memory 140.

  Here, when the power source of the load monitor 100 is turned off, when the load determination is different from the previous time, when the load limiter function is activated, when the operation setting load Ps of the load limiter function is set, the internal memory 140 is loaded. Data is written, and the data write count Ue is counted.

  The recommended replacement time output means M15 notifies that the device should be replaced when the data write count Ue is equal to or greater than the specified number Uf (that is, when the device reaches the recommended replacement time). Specifically, the recommended replacement time output means M15 displays an alarm display (for example, blinking of a lamp) indicating that the device should be replaced when the data write count Ue stored in the internal memory write count storage area 141 is equal to or greater than the specified count Uf. Display) is displayed on the display unit 160.

  Next, a control example of the control unit 110 will be described below with reference to FIGS. FIG. 4 is a schematic plan view showing the operation input unit 150 and the display unit 160 of the load monitor 100 shown in FIG.

  As shown in FIG. 4, the operation input unit 150 includes a number operation switch SW1, a time operation switch SW2, a SET operation switch SW3, a CLR operation switch SW4, a left operation switch SW5, a lower operation switch SW6, and an upper operation switch SW7. It has been. The display unit 160 is provided with load classification lamps LP1 to LP5, a load limiter function display lamp LP6, and a display unit DP.

  The load monitor 100 includes a normal mode A in which the load limiter function is not activated, a normal mode B in which the load limiter function is activated, a test mode for confirming whether the load limiter function is activated, and an operation setting used in the load limiter function. Setting mode A for automatically setting the load Ps, setting mode B for manually setting the operation setting load Ps used in the load limiter function, operation history confirmation mode (number confirmation mode for confirming the number of times, and time confirmation mode for confirming the time ). Each mode is selected by switching means (here, the mode switch 113 and the operation switches SW1 and SW2) provided in the control unit 110.

[Normal mode A]
When the operation status management of the crane 200 is performed, when the normal mode A that does not operate the load limiter function is selected by the mode changeover switch 113, the control unit 110 executes the normal mode A.

  FIG. 5 is a flowchart of a control example in the normal mode A. FIG. 6 is a diagram showing a subroutine S60 of the load category discrimination number counting process in the flowchart shown in FIG. 5, and FIG. 7 is a diagram showing a subroutine S70 of the load category discrimination time integration process in the flowchart shown in FIG. is there.

  In the normal mode A shown in FIG. 5, it is first determined whether or not a hoisting operation has been performed by the hoisting operation of the hoisting operation switch 230a (step S1), and when the hoisting operation has been performed (step S1: Yes), 1 count is added to the upper activation count Uc (step S2), and the process waits until the mask time Tm elapses (step S3: No). When the mask time Tm elapses (step S3: Yes), the measurement of the operation time starts (step S4), and after obtaining the load information (load voltage Vd or torque output voltage Vt) (step S5), the load Pf is obtained. Conversion is performed (step S6).

  Next, the subroutine S60 of the load category discrimination number counting process shown in FIG. 6 is executed. That is, it is determined which of the load categories P0 to P5 (load categories 0 to 5) the load Pf corresponds to (steps S7, S11, S15, S19, S23).

  Specifically, when the load Pf corresponds to the load category 0 (no load) in step S7 (step S7: Yes), 1 count is added to the upper operation count Ub0 (step S8), and the load category is different from the previous time. (Step S9: Yes), 1 count is added to the number of initial movements Ua0 (Step S10), and the process proceeds to Step S33 of the main routine shown in FIG. 5 while when the load classification is the same as the previous time (Step S9: No). Control goes to step S33. When the load Pf does not correspond to the load category 0 (no load) in step S7 (step S7: No), the process proceeds to step S11.

  When the load Pf corresponds to the load category 1 in step S11 (step S11: Yes), 1 count is added to the upper operation count Ub1 (step S12), and when the load category is different from the previous time (step S13: Yes), One count is added to the number of ground cuts Ua1 (step S14), and the process proceeds to step S33 of the main routine shown in FIG. 5, while when the load classification is the same as the previous time (step S13: No), the process proceeds to step S33 as it is. Further, when the load Pf does not correspond to the load category 1 in step S11 (step S11: No), the process proceeds to step S15.

  Hereinafter, similarly, the processing of steps S15 to S26 is performed, and the number of times of ground cutting Ua2 to Ua4 and the number of times of upward movement Ub2 to Ub4 are counted.

  When the load Pf does not correspond to the load category 4 at step S23 (step S23: No), 1 count is added to the upper operation count Ub5 (step S27), and when the load category is different from the previous time (step S28: Yes). ), 1 count is added to the number of ground cuts Ua5 (step S29), and the process proceeds to step S33 of the main routine shown in FIG. 5, while when the load classification is the same as the previous time (step S28: No), the process proceeds to step S33 as it is. To do.

  In step S33 shown in FIG. 5, the hoisting time Ta is added to the operating time Tc, and the subroutine S70 of the load classification discriminating time integrating process shown in FIG. 7 is executed. That is, in order to integrate the operation time for each load category 0 to 5, it is determined which of the load categories P0 to P5 (load categories 0 to 5) corresponds to the load Pf (steps S71, S73, S75, S77). , S79).

  Specifically, when the load Pf corresponds to the load category 0 (no load) in step S71 (step S71: Yes), the hoisting time Ta is added to the operation time T0 for each load category (step S72), and FIG. The process proceeds to step S34 of the main routine shown. Moreover, when the load Pf does not correspond to the load category 0 (no load) in step S71 (step S71: No), the process proceeds to step S73.

  When the load Pf corresponds to the load category 1 in step S73 (step S73: Yes), the hoisting time Ta is added to the operation time T1 for each load category (step S74), and the process goes to step S34 of the main routine shown in FIG. Transition. Further, when the load Pf does not correspond to the load category 1 in step S73 (step S73: No), the process proceeds to step S75.

  Hereinafter, similarly, the processing of steps S75 to S80 is performed, and the winding time Ta is added to the operation time T2 to T4 for each load category.

  If the load Pf does not correspond to the load category 4 in step S79 (step S79: No), the hoisting time Ta is added to the load category operation time T5 (step S81), and the steps of the main routine shown in FIG. The process proceeds to S34.

  In step S34 shown in FIG. 5, it is determined whether or not the hoisting operation by the hoisting operation of the hoisting operation switch 230a is stopped, and when the hoisting operation is stopped (step S34: Yes), the operation time is measured. Is finished (step S35).

  On the other hand, when the hoisting operation is not performed in step S1 (step S1: No), it is determined whether or not the lowering operation is performed by the lowering operation of the lowering operation switch 230b (step S36). When the operation is not performed (step S36: No), the process returns to step S1. On the other hand, when the lowering operation is performed (step S36: Yes), the measurement of the operation time is started (step S38), and the process proceeds to step S39.

  Next, at step S39, the lowering time Tb is added to the operation time Tc, and the subroutine S70 of the load classification determination time integration process shown in FIG. 7 is executed. That is, in order to integrate the operation time for each load category 0 to 5, it is determined which of the load categories P0 to P5 (load categories 0 to 5) corresponds to the load Pf (steps S71, S73, S75, S77). , S79).

  The processing of the subroutine S70 here is the same as the processing of the subroutine S70 except that the winding time Ta is changed to the winding time Ta and step S34 is changed to step S40 in the processing of the subroutine S70. The description is omitted here.

  In step S40 shown in FIG. 5, it is determined whether or not the lowering operation by the lowering operation of the lowering operation switch 230b is stopped. If the lowering operation is stopped (step S40: Yes), the operation time is measured. Is finished (step S41).

  In step S42, it is determined whether or not to continue the process. If the process is continued (step S42: Yes), the processes in steps S1 to S41 are repeated. If the process is not continued (step S42: No), the process is performed. finish.

[Normal mode B]
Further, when the normal mode B for operating the load limiter function is selected by the mode changeover switch 113, the control unit 110 executes the normal mode B. Here, the load limiter function lamp LP6 of the display unit 160 is turned on.

  FIG. 8 is a flowchart of a control example in the normal mode B. The flowchart in the normal mode B shown in FIG. 8 is the same as that in FIG. 5 except that the processes of steps S30 to S32 are added before the process of step S33 and the process of step S37 is added immediately after the process of step S36. These are the same as the flowchart in the normal mode A shown in FIG. 5, and different points will be mainly described below.

  In the normal mode B shown in FIG. 8, when the hoisting operation switch 230a is continuously operated for a predetermined time (about 2 seconds in this case) after the processing of steps S1 to S60 is completed, the load Pf is equal to or higher than the operation set load Ps. Or it is judged whether it exceeded (step S30). When the load Pf is less than or less than the operation set load Ps (step S30: No), the process proceeds to step S33. On the other hand, when the load Pf exceeds or exceeds the operation set load Ps (step S30: Yes), 1 count is added to the load limiter operation count Ud (step S31). Then, the load limiter function is operated to stop the operation of the hoisting motor 212 (step S32), and the process proceeds to step S35.

  Further, after the process of step S36 is completed, the suspension of the hoisting motor 212 by the load limiter function is released (step S37).

  When the load limiter function is activated and the operation of the hoisting motor 212 is stopped, here, the load classification lamps LP1 to LP5 of the display unit 160 are all turned on, and a message informing the display unit DP of this is displayed. Display.

[Test mode]
When the mode changeover switch 113 selects a test mode for confirming the operation when the load limiter is activated, the control unit 110 executes the test mode. At this time, the display unit 160 displays to indicate that it is in the test mode. Here, the load limiter function lamp LP6 of the display unit 160 is blinked, and a message notifying that is displayed on the display unit DP.

  FIG. 9 is a flowchart of a control example in the test mode. In this test mode, the load limiter function is activated by the hoisting operation regardless of the lifting load.

  In the test mode shown in FIG. 9, it is first determined whether or not a hoisting operation has been performed by the hoisting operation of the hoisting operation switch 230a (step S101). When the hoisting operation has been performed (step S101: Yes), it is determined whether or not the hoisting operation switch 230a has been operated continuously for a predetermined time (about 2 seconds in this case) (step S102). When the hoisting operation switch 230a is operated continuously for the predetermined time or longer (step S102: Yes), the load limiter function is activated to stop the hoisting motor 212 (step S103). On the other hand, when the hoisting operation switch 230a has not been operated continuously for the predetermined time or longer (step S102: No), the process proceeds to step S106.

  If the winding operation has not been performed in step S101 (step S101: No), it is determined whether or not the winding operation has been performed by the winding operation of the winding operation switch 230b (step S104). When the operation is not performed (step S104: No), the process returns to step S101. On the other hand, when the lowering operation is performed (step S104: Yes), the operation stop of the hoisting motor 212 by the load limiter function is canceled (step S105), and the process proceeds to step S106.

  In step S106, it is determined whether or not the process is to be continued. If the process is to be continued (step S106: Yes), the process of steps S101 to S105 is repeated. If the process is not continued (step S106: No), the process is terminated. .

  Here, when the load limiter function is activated and the operation of the hoisting motor 212 is stopped, the load classification lamps LP1 to LP5 of the display unit 160 are all turned on, and a message notifying the display unit DP of this is displayed. Display.

[Setting mode A]
When the mode changeover switch 113 selects the setting mode A for automatically setting the operation setting load Ps of the load limiter function, the control unit 110 executes the setting mode A. At this time, a display notifying that the setting mode A is in effect is displayed on the display unit 160. Here, the load classification lamps LP1 to LP5 of the display unit 160 are all turned on, the load limiter function lamp LP6 is blinked, and a message notifying that is displayed on the display unit DP.

  FIG. 10 is a flowchart of a control example in the setting mode A. When the operation setting load Ps is automatically set, a load for operating the load limiter function is lifted and ground.

  In setting mode A shown in FIG. 10, first, load information (load voltage Vd or torque output voltage Vt) is acquired (step S201), and then converted to load Pf (step S202).

  Next, it is determined whether or not a hoisting operation has been performed by the hoisting operation of the hoisting operation switch 230a (step S203). If the hoisting operation has been performed (step S203: Yes), it is determined whether or not the hoisting operation switch 230a has been operated continuously for a predetermined time (about 2 seconds in this case) (step S204). At this time, when the hoisting motor 212 is driven by the inverter G2, when the high-speed operation setting load Ps ′ is set, the high-speed operation is performed, and when the low-speed operation setting load Ps ″ is set. Operate at low speed.

  When the hoisting operation switch 230a has been operated continuously for the predetermined time or longer (step S204: Yes), the load Pf is set as the operation setting load Ps (step S205), and the load limiter function is activated for hoisting. The operation of the motor 212 is stopped (step S206). On the other hand, when the hoisting operation switch 230a has not been operated continuously for the predetermined time or longer (step S204: No), the process proceeds to step S209.

  If the winding operation is not performed in step S203 (step S203: No), it is determined whether or not the winding operation has been performed by the winding operation of the winding operation switch 230b (step S207). If no operation has been performed (step S207: No), the process returns to step S203. On the other hand, when the lowering operation is performed (step S207: Yes), the operation stop of the hoisting motor 212 by the load limiter function is canceled (step S208), and the process proceeds to step S209.

  In step S209, it is determined whether or not the process is to be continued. If the process is to be continued (step S209: Yes), the process of steps S203 to S208 is repeated. If the process is not continued (step S209: No), the process is terminated. .

  When the load Pf is set as the operation setting load Ps, here, a message informing that is displayed on the display unit DP of the display unit 160.

[Setting mode B]
When executing the setting mode B, a selection operation for selecting the setting mode B is performed by the operation input unit 150 in the normal mode B state. In the present embodiment, when the number operation switch SW1 and the time operation switch SW2 are simultaneously pressed and pressed (here, 2 seconds or more) and the setting mode B for manually setting the operation setting load Ps of the load limiter function is selected. The control unit 110 executes the setting mode B. At this time, a display notifying that the setting mode B is in effect is displayed on the display unit 160. Here, the load classification lamps LP1 to LP5 of the display unit 160 are all turned on, the load limiter function lamp LP6 is blinked, and a message notifying that is displayed on the display unit DP.

  FIG. 11 is a diagram illustrating a setting example of the operation setting load Ps in the setting mode B. FIG. 11A shows the load Pf detected most recently and the current setting load Ps on the display unit DP. FIG. 11B shows an operation state before changing the set load Ps displayed on the display unit DP, and FIG. 11C shows the set load displayed on the display unit DP. The state where Ps is changed is shown.

  In the setting mode B, first, “load Pf when the load classification is determined immediately before” and “current set load Ps” are displayed on the display unit DP (see FIG. 11A). When the hoisting motor 212 is driven by the inverter G2, whether to change the setting of the high-speed set load Ps ′ or the low-speed set load Ps ″ This is selected and input at 150. Here, when the lower operation switch SW6 is operated, the low speed side is selected, and when the upper operation switch SW7 is operated, the high speed side is selected. “Selection confirmation of the side or the low speed side” → “the load Pf when the load classification is determined immediately before” → “the current set load Ps” is displayed in this order at predetermined time intervals (here, 3 seconds).

  Note that the values of the load Pf and the set load Ps displayed at this time may be actual current values or load values, but here, the values taken in when loaded into the load monitor 100 main body ( It is not the actual current value or load value.

  Next, the value of the set load Ps is changed by performing an input operation on the operation input unit 150. Here, the numerical value of the digit corresponding to “.” In the segment display shown in FIGS. 11B and 11C is the numerical value to be changed. When the left operation switch SW5 is operated, the “.” Display shifts (see FIG. 11B). When the lower operation switch SW6 is operated, the numerical value is “−”, and when the upper operation switch SW7 is operated, the numerical value is “+” (see FIG. 11C). When the “.” Display is in the 1st place, it is “−” or “+” by 1; when the “.” Display is in the 10th place, it is “−” or “+” by 10; When the “.” Display is in the hundreds position, it is “−” or “+” by 100.

  In the illustrated example, a procedure example of changing the set value “700” to “650” by performing a “−” operation at the tenth place is shown. That is, as shown in FIG. 11 (b), when the left operation switch SW5 is operated once, the “.” Display moves by one digit, and as shown in FIG. 11 (c), the lower operation switch SW6 is moved five times. When operated, the display becomes “650”.

  Next, the value of the set load Ps is set by performing a setting operation with the operation input unit 150. Here, the changed set load Ps is set by operating the SET operation switch SW3. It should be noted that after displaying the setting completion on the display unit 160, it is possible to return to the normal mode B. Further, if the CLR operation switch SW4 is operated during the setting, the state of the setting mode B is reset and the state of the normal mode B can be returned. In this case, the value of the set load Ps is not changed.

[Operation history check mode]
The operation history can be confirmed in the normal mode A or the normal mode B. In other words, the output unit (here, the display unit) 160 such as a display unit or a printing unit displays the number of operations U0 to U5 and the operation time T0 to T5 for each load category 0 to 5 such as display or printing (display here). As a result, the output operation times U0 to U5 and operation times T0 to T5 can be used to calculate various estimated values related to preventive maintenance such as the life of the crane 200 and the replacement timing of replacement parts. Become. In the present embodiment, the operation history cannot be confirmed during the hoisting operation and the lowering operation. Further, during the operation history display, the operation switch is disabled until the display is completed.

(Number confirmation mode)
When executing the number confirmation mode for confirming the number of times, the number confirmation mode is selected by the operation input unit 150 in the normal mode A or the normal mode B. Here, when the number operation switch SW1 is operated in the normal mode A or the normal mode B, the control unit 110 executes the number confirmation mode. At this time, a display notifying the selected normal mode A or normal mode B is performed on the display unit 160. Here, in the normal mode A, the load limiter function lamp LP6 of the display unit 160 is turned off, while in the normal mode B, the load limiter function lamp LP6 of the display unit 160 is turned on.

  In the number confirmation mode, first, an instruction operation for instructing the number confirmation is performed on the operation input unit 150, and a display operation for displaying the number of contents to be confirmed on the display unit 160 is performed. Here, after an instruction to confirm the number of times is made by operating the number-of-times operation switch SW1, the number of times of the contents to be displayed is displayed on the display unit DP by operating the operation switch of the contents to be displayed.

  Table 7 shows an operation switch operation list for each display content related to the number of times, and Table 8 shows a display list of display content related to the number of times displayed on the display unit DP.

  FIG. 12 is a diagram showing a display example of the number of times in the number of times confirmation mode, and shows a state in which the number of ground cuttings Ua1 in the load category 1 is displayed on the display unit DP.

  After the number of times operation switch SW1 is operated in the operation input unit 150, for example, when displaying the number of ground cuttings Ua1 of the load category 1, the SET operation switch SW3 is operated, as shown in FIG. In addition, the display unit DP of the display unit 160 includes “message indicating load category 1” → “first four digits of ground cutting Ua1 (here,“ 0000 ”)” → “last four digits of ground cutting number Ua1 (0090) "Are displayed in this order at predetermined time intervals (here, 3 seconds). Thereby, from the display of the display unit DP, the number of ground cuttings Ua1 of the load category 1 is known as “90 times”. When this display is completed, the state before confirmation (normal mode A or normal mode B ("----" display)) is restored.

(Time confirmation mode)
When executing the time confirmation mode for confirming the time, the time confirmation mode is selected by the operation input unit 150 in the normal mode A or the normal mode B. Here, when the time operation switch SW2 is operated in the normal mode A or the normal mode B, the control unit 110 executes the time confirmation mode. At this time, a display notifying the selected normal mode A or normal mode B is performed on the display unit 160. Here, in the normal mode A, the load limiter function lamp LP6 of the display unit 160 is turned off, while in the normal mode B, the load limiter function lamp LP6 of the display unit 160 is turned on.

  In the time confirmation mode, first, an instruction operation for instructing time confirmation is performed by the operation input unit 150, and a display operation for displaying the time of the content to be confirmed on the display unit 160 is performed. Here, after the instruction to confirm the time is given by operating the time operation switch SW2, the operation switch having the content to be displayed is operated to display the time having the content to be displayed on the display unit DP.

  Table 9 shows an operation switch operation list for each display content related to time, and Table 10 shows a display list of display content related to time displayed on the display unit DP.

  FIG. 13 is a diagram showing a display example of time in the time confirmation mode, and shows a state in which the operation time Tc is displayed on the display unit DP.

  After the time operation switch SW2 is operated on the operation input unit 150, for example, when the operation time Tc is displayed, the SET operation switch SW3 and the CLR operation switch SW4 are operated simultaneously. As shown in the figure, the display unit DP of the display unit 160 displays “message indicating the operation time Tc” → “display of the time unit of the operation time Tc (here,“ 0607 ”)” → “truncated in units of the operation time Tc. "Display in minutes (0029)" is displayed in this order at predetermined time intervals (here, 3 seconds). Thereby, the operation time Tc is known as “607 hours 29 minutes” from the display on the display unit DP. When this display is completed, the state before confirmation (normal mode A or normal mode B ("----" display)) is restored.

  As described above, the load monitor 100 can obtain information necessary for accurately estimating the life of the crane 200 in accordance with the operation rate in consideration of the load factor, the number of operations and the operation time. That is, when the crane 200 is used within the rating according to the number of operations and time, the life can be accurately estimated to be longer than the expected life (2500 days), and the crane 200 is rated according to the number of operations and time. When it is used exceeding it, it is possible to accurately estimate a life shorter than the assumed life (2500 days).

  FIG. 14 is a diagram showing a record list for recording various data displayed on the display unit 160 for each date.

  For example, the operator can enter various data displayed on the load monitor 100 after the day's work is completed in the record list shown in FIG. Note that the recording list shown in FIG. 14 may be printed out together with the number of times and time data.

  Using such a record list, the preventive maintenance of the crane 200 can be reliably performed by using data such as the number of operations and the operation time of the suspended load part 211 read for each of the load categories 0 to 5. it can.

  More specifically, the state of the load is related to the number of operations in which a specific load is lifted. If the load Pf, the rated load Pmax of the crane, and the operation counts U1 to Un (n is an integer of 2 or more, where n is 4) by load category, the theoretical load for the crane is known. The spectral coefficient Kp can be calculated by the following equation (1).

  In the formula (1), Ut is the total number of operations U1 to Un in all the load categories 1 to n.

  Further, (Pf1 / Pmax) to (Pfn / Pmax) (here, n is 4) in the expression (1) corresponds to the load categories 1 to 4 of the present embodiment.

  When the load categories 1 to 4 are 50%, 63%, 80%, and 100%, for example, the operation counts U1 to U4 for each load category are 40000 times, 30000 times, 20000 times, and 10,000 times, respectively. In this case, the total number of operations Ut is 40000 times + 30000 times + 20000 times + 10000 times, which is 100,000 times in total. Substituting these values into equation (1),

  Therefore, it can be estimated that the theoretical load spectrum coefficient Kp considering the number of operations is about 0.33.

Then, the load state can be estimated as “Q3−heavy” from the load spectrum coefficient Kp (0.33) and Table 2 described above. Therefore, the total number of operations Ut (100,000 times), the crane usage class “U ₃ ” obtained from the above-mentioned Table 1, the load state “Q3-heavy”, and the above-described Table 3 as a group as a whole crane. The grade can be estimated as “A4”.

  Thereby, it can be confirmed whether it is the use suitable for the grade as the whole crane.

  The state of the load is related to the operation time during which a specific load is lifted. When the load Pf, the rated load Pmax of the crane, and the operation time T1 to Tn (here, n is 4) for each load category are known, the theoretical load spectrum coefficient Km for the mechanism is It can be calculated in (2).

  In the formula (2), Tt is the total of the operation times T1 to Tn (here, n is 4) in all the load categories 1 to n.

  Further, (Pf1 / Pmax) to (Pfn / Pmax) (here, n is 4) in the expression (2) corresponds to the load categories 1 to 4 of the present embodiment.

  When the load categories 1 to 4 are 50%, 63%, 80%, and 100%, for example, the operation times T1 to T4 for each load category are 1000 hours, 2000 hours, 3000 hours, and 4000 hours, respectively. In this case, the total operation time Tt is 1000 hours + 2000 hours + 3000 hours + 4000 hours, which is 10,000 hours in total. Substituting these values into equation (2) gives

  Thus, it can be estimated that the theoretical load spectrum coefficient Km considering the operation time is about 0.62.

Then, the load state can be estimated as “L4-superheavy” from the load spectrum coefficient Km (0.62) and Table 5 described above. Therefore, the total operating time Ut (10,000 hours) and the use class “T ₆ ” of the mechanism obtained from the above-mentioned Table 4, the load state “L4-superheavy”, and the above-described Table 6 as a group as the entire mechanism. The grade can be estimated as “M8”.

  Thereby, it can be confirmed whether it is the use suitable for the grade as the whole mechanism.

  Further, in the present embodiment, by counting the initial movement count Ua0 and the number of ground cuts Ua1 to Ua5 and the upper movement count Ub0 to Ub5 separately, for example, the number of ground cuts Ua1 to Ua5 is related to the structural system of the crane 200. In order to calculate an estimated life of a structural part (e.g., crane girder, saddle, etc.) to be operated, or an electrical part (e.g., hoist) Etc.) can be used to calculate the estimated lifetime.

  In the present embodiment, since the voltage value is detected as the load information, the commercial drive is performed by detecting the load voltage Vd converted from the load current Id as the load Pf by the current sensor 220 in the case of the commercial drive. In addition to being able to correspond to the crane 200, in the case of inverter driving, by detecting the torque output voltage Vt as the load Pf, it is also possible to correspond to the crane 200 driven by the inverter. Therefore, the load monitor 100 can be used in common for the commercial drive and the inverter drive.

  In the present embodiment, since the load limiter operation is performed using the load Pf detected by the load detection means M1, it is not necessary to provide a separate load limiter function, and the cost can be reduced accordingly.

  In the present embodiment, when the hoisting motor 212 is driven by the inverter G2 at a two-stage speed, the load detection means M1 outputs the torque output voltage pressures Vt ′ and Vt ″ in two stages. Since the load Pf is converted according to the speed, it is possible to cope with the difference in the torque output voltages Vt ′ and Vt ″ due to the speed difference under the same load.

  Further, in the present embodiment, since the automatic setting means M8 is provided, the operation setting load is not performed without performing complicated setting work such as setting the operation setting load by an input operation of the setting volume or the like by the operator as in the prior art. By simply lifting the load to be set to Ps, the load Pf of the load can be set as the operation set load Ps. Accordingly, when setting the operation set load Ps, the setting work can be facilitated and the setting work time can be reduced. It becomes possible to shorten.

  In the present embodiment, when the hoisting motor 212 is driven by the inverter G2 at a two-stage speed, the automatic setting means M8 sets the load Pf as the operation set loads Ps ′ and Ps ″. Since the speed is set for each of the two stages, it is possible to cope with the difference in torque output voltages Vt ′ and Vt ″ due to the difference in speed under the same load.

  In the present embodiment, the manual setting means M9 displays the load Pf detected immediately before by the load detection means M1 on the display unit 160 as a default value. After lifting the load in mode A or normal mode B, the operator can set the operation setting load Pf to the load displayed on the display unit 160.

  In addition, although the operation condition management apparatus 100 according to the present embodiment stores the operation counts U0 to U5 and the operation times T0 to T5 for each load category, the operation count and the operation time may be stored for each load factor.

  Further, here, the description has been given of calculating the lifetime and the like using the record list shown in FIG. 14, but the load monitor 100 is connected to a computer such as a personal computer, and the calculation processing is performed by taking the data into the computer. You may do it.

  In addition, the operation status management apparatus 100 according to the present embodiment may be configured by a load detection unit M1, a load limiter operation unit M7, and an automatic setting unit M8. The operating status management apparatus 100 in this case may further include manual setting means M9.

100 Load monitor (an example of operating status management device)
200 Crane 211 Suspended load section 220 Current sensor G1 Commercial power supply G2 Inverter Id Load current M1 Load detection means M2 Load classification discrimination means M3 Count count means by load classification M4 Time accumulation means by load classification M5 Storage means by load classification M6 Output means M7 Load limiter operating means M8 Automatic setting means M9 Manual setting means P Load rate Pf Load Pmax Rated load Ps Operation set loads P0 to P5 Multiple load categories T0 to T5 Operating time U0 to U5 Operating frequency Ua0 Initial operating frequency Ua1 to Ua5 Grounding frequency Ub0 to Ub5 Upper operation frequency Vd Load voltage Vt Torque output voltage

Claims (12)

  For each load factor corresponding to the load information at the suspended load section provided in the crane, the number of operations of the suspended load section is counted and the operation time of the suspended load section is integrated, and the obtained number of operations and operation time are obtained. The crane operating condition management device is configured to store each load factor. Load classification determination means for determining which one of a plurality of preset load classifications corresponds to the load information in the suspended load section provided in the crane;
Number-of-times counting means for each load category that counts the number of operations of the suspended load part for each load category determined by the load category determining means;
Load time-by-load time accumulating means for accumulating the operating time of the suspended load part for each load classification determined by the load classification determining means;
A load classification storing means for storing the number of operations counted by the load classification count counting means and the operation time accumulated by the load classification time accumulation means for each load category. A crane operating status management device. In the crane operating condition management device according to claim 2,
The crane operating condition management apparatus further comprising output means for reading out and outputting the number of operations and the operation time stored by the load classification storing means. In the operation status management device for the crane according to claim 2 or 3,
The number-of-times-counting means for each load category counts two types of operation times, ie, the number of times that the suspended portion is grounded and the number of up-motions for each load category determined by the load category determination unit. When the load classification determined by the load classification determination unit is different from the previous load classification, both the number of earth cuttings and the number of upper movements are counted, and the load classification determination is performed. The crane operating condition management device, wherein when the load classification determined by the means is the same as the previous load classification, only the number of times of the upper movement is counted. In the crane operating condition management device according to any one of claims 1 to 4,
The load information is configured to detect a voltage value, and when a lifting motor provided in the crane is driven by a commercial power source, a load current flowing to the lifting motor by a current sensor Of the crane, wherein when the lifting motor provided in the crane is driven by an inverter, the torque output voltage output from the inverter is detected. Operation status management device. In the crane operating condition management device according to claim 5,
The crane operating state management device, wherein when the lifting motor is driven by the inverter at a plurality of different speeds, the torque output voltage is detected according to the plurality of speeds. In the crane operating condition management device according to any one of claims 1 to 6,
The crane operating condition further comprising load limiter operating means for stopping the upper operation when the load information or a value corresponding to the load information exceeds or exceeds a preset operation set load. Management device. In the crane operating condition management device according to claim 7,
The crane operating condition further comprising an automatic setting means for setting the load information by the load or a value corresponding thereto as the operation set load by lifting a load to be set as the operation set load Management device. Load limiter operation means for stopping the upper operation when the load information at the suspended load section provided in the crane or the operation setting load set in advance with respect to the value corresponding to the load information or exceeding it,
An operating condition of a crane, comprising: an automatic setting means for setting the load information by the load or a value corresponding thereto as the operation setting load by lifting a load to be set to the operation setting load Management device. In the crane operating condition management device according to claim 8 or 9,
The load information is configured to detect a voltage value, and when a lifting motor provided in the crane is driven by a commercial power source, a load current flowing to the lifting motor by a current sensor When the hoisting motor provided in the crane is driven by an inverter, the torque output voltage output from the inverter is detected and the hoisting provided in the crane is detected. When the upper motor is driven by the inverter at a plurality of different speeds, the torque output voltage is detected according to the plurality of speeds, and the automatic setting means detects the detected value or a value corresponding thereto. Is set as the operation set load for each of the plurality of speeds. In the crane operating condition management device according to any one of claims 7 to 10,
It further comprises manual setting means for setting the operation setting load by an operator's input operation,
The crane operation status management device, wherein the manual setting means displays load information obtained immediately before or a value corresponding to the load information.   A crane comprising the crane operating condition management device according to any one of claims 1 to 11.

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