JPH08104492A - Operational time recording device of crane - Google Patents

Abstract

PURPOSE: To enable preventive maintenance, so as to enable a device to be used safely by using a non-contact type ammeter as a sensor, distinguishing the continuous operation from the intermittent operation through a process of discriminating the electrification pattern in the operating state of the crane, and recording the operational time. CONSTITUTION: An operational time recording device is provided with a function for discriminating and recording the operating state and the operational time of a crane from an output signal of a sensor for detecting an electric motor current. Respective electric motors in traveling, in traversing, in main winding, in sub winding are connected to an a.c. power source through a normal rotational switch 11 and a reverse rotational switch 12, a normal rotational, sensor 13 and a reverse rotational sensor 14 are provided on a normal rotation CCT and a reverse rotation CCT of respective electric motors, a signal output is connected to an A/D converter 5, and a microcomputer 6 is put in connection. The microcomputer 6 operates the A/D converter, judges the ON-OFF or operational mode of the electric motor, and performs recording of the operational time. That is, in the operating state of the crane, the continuous operation is distinguished from the intermittent operation, and the operational time is recorded, thereby the judgement of capabilities of the crane can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating time classification and summarizing device for grasping the operating condition of an overhead traveling crane, and more particularly to a crane operating time recording device for recording / analyzing crane operation.

[0002]

2. Description of the Related Art In order to analyze the operating condition of a crane,
As shown in FIG. 6, there is a device for recording the operation time or number of times of hoisting and lowering. In this system, a control signal is taken out from the control circuit of the crane and is taken into a recording device to discriminate the operation and record the operation. Analyzing the operating condition of the crane,
By quantitatively grasping the dead time during each operation, a great effect can be expected, such as creating an efficient improvement work plan or estimating the consumption of parts from accumulated operation time and using it for preventive maintenance. It is a thing.

[0003]

However, in the conventional device, it is necessary to make an additional modification of the control signal output to the existing crane and take out the signal input to the newly installed recording device. There was a drawback that was not easy.

It is an object of the present invention to provide an operating time recording device which can be attached to all cranes using a simple sensor without modifying the machine body and control circuit of an existing crane.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and includes a sensor attached to a crane for individually detecting electric currents of electric motors for traveling, traversing, main winding, and auxiliary winding. , It consists of a device with a function to determine and record the operating status and operating time of the crane from the output signal of each sensor, and a non-contact ammeter is used for the current detection sensor, and the operating status of the crane is The gist is to record the operating time by distinguishing between continuous operation (power running) and intermittent operation (inching) by determining the energization pattern.

[0006]

[Operation] A sensor that is attached to a crane and that individually detects the electric current of each motor for traveling, traverse, main winding, and auxiliary winding,
This is a crane operating time recording device consisting of a device that has a function of determining the operating status and operating time of the crane from the output signal of each sensor and recording the same, using a non-contact clamp type sensor, In addition, the operating state of the crane is recorded by distinguishing the continuous operation (power running) and the intermittent operation (inching) by determining the energization pattern.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A crane operating time recording apparatus according to the present invention will be described below with reference to the embodiments shown in the drawings. In FIG. 1, reference numeral 1 denotes a traveling electric motor in an overhead traveling crane. The traveling electric motor 1 is connected to an AC power supply UVW via a forward rotation switch (forward CCT) 11 and a reverse rotation switch (reverse CCT) 12. Similarly, the traverse motor 2, the main hoisting electric motor 3, and the auxiliary hoisting electric motor 4 are also connected to an AC power source via a forward rotation switch and a reverse rotation switch, respectively, and these respective motors 1, 2, 3, 4 are on the ceiling. It is mounted on a traveling crane (not shown).

Motors for traveling, traversing, main winding, and auxiliary winding are connected to an AC power source through a forward rotation switch and a reverse rotation switch, respectively. The forward rotation CCT circuit and the reverse rotation of each motor are connected. The CCT circuit includes a forward rotation sensor 13 and a reverse rotation sensor 14, respectively.
Is provided, the signal output of the sensor of each circuit is connected to the A / D converter 5, analog-to-digital conversion is performed, and the microcomputer 6 is connected to the A / D converter 5.

The microcomputer 6 operates the A / D converter at every constant sampling time to determine the digitally converted current signal to determine the ON / OFF and operation modes of the electric motor, and record the operation time and The records are totaled and the total data is printed out by the printer 7.

In the circuit thus constructed, the main program of the microcomputer section for judging the operation of the electric motor is roughly divided into a measuring section A and a data totaling section B, and operates according to the procedure shown in FIG. Hereinafter, description will be given with reference to FIG.

The structure of the program of the measuring unit A is as follows. After setting the sampling cycle in the initial setting, the measurement unit creates a data file to record the measurement data,
Subsequent measurement data is recorded in all data files. In the embodiment of the present invention, the sampling period is 20 ms. Specifically, the A / D-converted current signal is determined for each sampling cycle, and data is obtained by collectively showing ON / OFF of the motor, signal channel numbers, energization start and end times, and distinction between continuous energization and intermittent energization. Record as a block in the data file. Here, the signal channel number is a preset input channel number of the current signal for each forward / reverse rotation of each motor, and it is easy to know which motor is rotating in the forward or reverse direction according to the input channel number. It is a thing.

The program flow of the measuring unit A is shown in FIGS.
It will be described based on. (1) In the measurement subroutine that is executed at a constant cycle for each sampling time, first, all inputs are A / D converted, and at the same time, the current time is stored and O for each channel is stored.
Move on to N-OFF discrimination. (2) The ON-OFF discriminating unit discriminates whether the input current value data obtained by A / D conversion is larger or smaller than a predetermined threshold value. When the input value is larger, energization starts, and when it is smaller. Performs a process of determining the end of energization. (3) If it is the determination of the energization start, whether or not the energization is started for the first time is discriminated by the display of the power running counter. Check the operation mode and end time of. (4) The previous energization state was continuous energization (power running flag 1)
Alternatively, if a predetermined time (t1) or more has elapsed from the previous energization end time, the current time stored in (1) is recorded as the energization start time. When the previous energization state is intermittent energization and is within t1 seconds after the end of energization, the end time of the previous energization is applied as the energization start time. (5) In the above (3), when the energization determination continues from the time of the previous sampling, (power running counter display ≧ 1), and the energization period is determined after adding 1 to the counter. The energization period is determined by determining whether or not the numerical value of the power running counter exceeds a preset value (Dt). If the value of the power running counter is larger than Dt, it is determined to be continuous operation, and the power running flag is set to 1 to indicate continuous operation, and the process returns to the main program. Power running counter is set value D
If it is less than t1, the process directly returns to the main program. (6) If the current obtained by A / D conversion is lower than the threshold value, it is first checked whether the powering counter is 0 or not. If it is not 0, it is determined that the end of energization is detected, the time at that time is recorded as the end time, a data block is created according to the recording data format like the one data block in FIG. 3, and is recorded in the data file. After that, the power running counter and the power running flag are reset to 0 to prepare for the next measurement, and then the process returns to the main program. (7) For inching in which energization is repeated for a short time, it is necessary to measure not only the energizing time but also the OFF time during that time. However, in the present invention, since a series of inching states are batched, the interval t1 second If it is within the range, the end time of the previous energization is added up as the next energization start time.

Next, the data totalization (arrangement) section B is shown in FIG.
It will be described based on. The data totaling unit B creates and prints out daily reports, monthly reports and full-year reports. Daily report creation flow (1) Read only one record of the data block created by the measurement unit. (2) Compare with the date (year, month, day) of the previously read data. There is no "previous date" in the first read, so the date read is the previous date. (3) If the dates are the same, the channel number and the operation mode are discriminated, the operation time is integrated for each of power running and inching, the number of operations is counted, and the process returns to (1). (4) If the date changes, total the running time and number of operations up to that point for each channel and operation mode,
After creating the output format and outputting to a file, update the initial value and return to (2). (5) The above operation is repeated until the end of the data. Monthly report creation flow Similar to the daily report creation float, daily data is aggregated into a monthly report. Full-year report creation Record the operation status over a relatively long period of time sequentially in the daily report creation flow and monthly report creation flow.

FIG. 6 shows an output example of the daily report, the monthly report, and the full-term report of the crane operating time, which are classified and prepared for each motor and its operation and printed out.

[0015]

According to the present invention, a sensor mounted on a crane for individually detecting electric currents of electric motors for traveling, traversing, main winding, and auxiliary winding, and operating conditions and operation of the crane based on output signals of these sensors It consists of a device with the function of discriminating and recording time, and uses a non-contact type ammeter as the current detection sensor, and the operating state of the crane is continuous operation (power running) and intermittent by judging the energization pattern. Since the operating time is recorded separately from the operation (inching), the operating status of the crane can be quantitatively grasped and the crane capacity can be judged from the length of each operating time, so effective improvement is considered. At the same time, it is possible to estimate the amount of wear of parts from the data of each operation time and replace it before the crane breaks down, which enables preventive maintenance. There are a number of advantages, such as it is safe to use the emissions.

[Brief description of drawings]

FIG. 1 is an overall circuit diagram showing an embodiment of a crane operating time recording apparatus of the present invention.

FIG. 2 is a main program flow of the present invention.

FIG. 3 is a program flow of a measuring unit.

FIG. 4 is a graph of a measuring unit.

FIG. 5 is a program flow of a tallying unit.

FIG. 6 is an output example diagram showing a measurement result according to the present invention.

FIG. 7 is an explanatory diagram of a known example.

[Explanation of symbols]

 1 Traveling electric motor 11 Forward rotation switch 12 Reverse rotation switch 13 Forward rotation sensor 14 Reverse rotation sensor 2 Traverse electric motor 3 Main hoisting electric motor 4 Supplementary hoisting electric motor 5 A / D converter 6 Microcomputer 7 Printer

Claims (1)

[Claims] 1. Attached to a crane, traveling, traversing,
It consists of a sensor that individually detects the current of each motor of the main winding and auxiliary winding, and a device that has the function of determining and recording the operating status and operating time of the crane from the output signals of each of these sensors. A non-contact ammeter is used for the crane, and the operating state of the crane is characterized by distinguishing continuous operation (power running) and intermittent operation (inching) by judging the energization pattern, and the operating time is recorded. Operating time recorder.