JP3368345B2 - Overload prevention device with load history management function - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an overload prevention device such as a crane having a load history management function. 2. Description of the Related Art An overload preventive device for a crane or the like has a function of automatically stopping the operation of the crane when the load to be lifted exceeds the rated load, or generating an alarm before the load exceeds the rated load. Things. In order to fulfill this function, the overload prevention device needs to recognize what attachment configuration is actually constructed and which hook is used to suspend the load. At present, as means for recognizing what kind of attachment structure is assembled, there are two means for automatically recognizing the attachment by assembling the attachment and recognizing the attachment by assembling and then setting or selecting by the operator. Can be Although it can be said that the means of (1) does not cause incorrect recognition because of automatic recognition, the means of (2) depends on the setting or selection by the operator and may result in incorrect recognition. Also, the means for recognizing which hook is used to hang the load currently depends on the operator's selection, and there is a possibility that the recognition may be erroneous similarly to the attachment configuration. At present, overload protection devices include: 1)
2) Data indicating the number of times the machine was overloaded as a means of grasping what type of lifting work the machine was performing in the event of a fall, etc. Some have a function of recording data indicating the state of the machine at the time of maximum overload, data indicating the frequency of load, and the like (hereinafter, this function is referred to as a load history management function). In order to improve the reliability of data recorded by the load history management function, as well as satisfying the function of the overload prevention device, any attachment structure is actually set and the hook is used to suspend the load. You need to know the right information. [0006] However, since the current situation depends on the setting or selection of the operator, there is a high risk that the recorded data will be incorrect data. An object of the present invention is to improve the reliability of recorded data by not using data recorded by the load history management function when there is an error in a portion depending on the setting or selection of an operator. For this purpose, in the overload prevention device with a load history management function of the present invention, an attachment configuration information setting device for setting an attachment state and a hook for hanging a load are selected. A hook selection device to calculate a suspension load from at least the information provided by the attachment configuration information setting device and the hook selection device, and a calculation / input / output device that monitors whether or not it may be recorded as load history management data, A load history management data recording unit that records the load history management data sent from the calculation / input / output device; and a rated load that stores a rated load corresponding to information provided by the attachment configuration information setting device and the hook selection device. A storage unit;
Provided by the input / output device, at least attachment configuration information, a display unit for displaying the suspended load and the rated load, the computing and input / output device, the calculated suspended load and the rated load given from the rated load storage unit and Control the output of the signal that automatically stops the crane operation and change the attachment configuration information.
T1 (seconds) have passed since then and the hook selection has changed
When the load history management data storage condition that T2 (seconds) elapses is satisfied, the load history management data is sent to the load history management data recording unit. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram of an overload prevention device with a load management function according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing an attachment configuration of a crane. In the figure, an overload prevention device 1 includes an attachment configuration information setting device 2, a hook selection device 3, a calculation / input / output device 4, a load history management data recording unit 5, a rated load storage unit 6, and a display unit 7. You. The attachment configuration information setting device 2 is shown in FIG. 2 in such a manner that BL (boom length), HB (boom hook mass),
nB (number of boom hooks), DB (drum on which wire ropes hanging the boom hooks are wound), JL (jib length), JB (mass of jib hooks), nJ (number of jib hooks), DJ (hanging jib hooks) It is a device for setting the drum on which the wire rope is wound and OFFSET (the mounting angle of the jib). The hook selection device 3 is a device for selecting the hook 8 on which the load L is suspended. The operation / input / output device 4 is based on information provided from the attachment configuration information setting device 2, hook selection device 3, TB (tension detector signal) and θB (angle detector signal) in FIG. W (suspension load = weight of hook 8 + weight of load L) is calculated, compared with WL (rated load) given from rated load storage unit 6, and Stop (signal for automatically stopping operation of crane) is calculated. Control the output. Further, it is monitored whether or not the data can be recorded as load history management data.
(Load history management data). The load history management data recording unit 5 stores DATA (load history management data) sent from the arithmetic / input / output device 4.
Recording section. The rated load storage unit 6 is a storage unit of a WL (rated load) corresponding to the information provided by the attachment configuration information setting device 2 and the hook selection device 3.
Is given to the operation / input / output device 4. The display unit 7 displays the attachment configuration information, the suspension load, the rated load, and the like provided by the calculation / input / output device 4. Next, the operation of the embodiment of the present invention will be described with reference to FIGS. In step 1, it is monitored whether the attachment configuration information has been changed by the attachment configuration information device 2. If the attachment configuration information has been changed, FLAG_ATCH = 0 is set in step 2 to recognize that the attachment configuration information has been changed. Timer1 = 0
(Seconds). If the attachment configuration information has not been changed, FLAG_ATCH = 1 in step 3
And Here, the attachment configuration information is changed, but if the set attachment configuration information does not match the actually assembled attachment configuration, the attachment configuration information, the suspension load, and the rated load displayed on the display unit 7 are displayed. The operator can recognize that the setting is wrong by looking at the information. Therefore, if an incorrect setting is made, the setting should be changed back to a correct setting. Therefore, after changing the attachment configuration information, the setting may be incorrect until T1 (second) passes. T1 (second)
If it passes, it is determined that the settings are correct. Therefore, in step 4, FLAG_ATCH
= 0 or FLAG1 = 0 is monitored. If the attachment information configuration has been changed, FL
Since AG_ATCH = 0, the flow proceeds to step 5 and FL
AG1 = 0. In addition, until T1 (second) elapses after the attachment configuration information is changed, FLAG1 = 0 has already been set in step 5 immediately after the change, and the process proceeds to step 5 and FLAG1 = 0. Next, at step 6, it is monitored whether Timer1> T1 (second). After T1 (seconds) has elapsed, FLAG1 =
By setting it to 1, it is determined that the attachment configuration information is correct. If FLAG_ATCH ≠ 0 and FLAG ≠ 0 in step 4, FLAG1 = 1 is set in step 8, and it is determined that the attachment configuration information is correct. Next, at step 9, it is monitored whether or not the hook selection device 3 has changed the selection of the hooks hanging the load.
If it has been changed, FLAG_HOOK in step 10
= 0 and recognizes that the hook selection has been changed. Also,
Timer2 = 0 (second) is set. If the hook selection has not been changed, the FLAG_HO
OK = 1. Here, the hook selection is changed, but if the selected hook does not match the hook on which the load is actually suspended, the attachment configuration information displayed on the display unit 7, the suspended load, the rated load, etc. The operator can recognize that the selection is wrong. Therefore, if an incorrect selection has been made, it must be changed back to a correct selection. Therefore, after the hook selection is changed, the selection may be incorrect until T2 (second) elapses. , T
If two (seconds) have elapsed, it is determined that the selection is correct. Therefore, at step 12, FLAG_HOO
It monitors whether K = 0 or FLAG2 = 0. If the hook selection has been changed, FLAG_
Since HOOK = 0, the process proceeds to step 13 and FLAG
2 = 0. Also, after the hook selection is changed,
Until 2 (seconds) have passed, step 1
Since FLAG2 = 0 at 3, step 1
Proceed to 3 and FLAG2 = 0. Next, at step 14, T
It is monitored whether imer2> T2 (seconds). T
After 2 (seconds), FLAG2 = 1 is set in step 15 to determine that the hook selection is correct. If FLAG_HOOK ≠ 0 and FLAG2 ≠ 0 in step 12, FLAG2 = FLAG2 = 0 in step 16
By setting to 1, it is determined that the hook selection is correct. Next, at step 17, it is monitored whether FLAG1 = 0. When FLAG1 = 0, since T1 (second) has not elapsed since the change of the attachment configuration information, step 18 is executed.
The Timer is counted up with. FLAG1 ≠ 0
At the time of T1, after changing the attachment configuration information,
Since (seconds) have elapsed, Timer1 is not counted up. Next, at step 19, it is monitored whether FLAG2 = 0. When FLAG2 = 0, Timer2 is counted up in step 20 because T2 (second) has not elapsed since the selection of the hook was changed. When FLAG2 ≠ 0, Timer2 is not counted up because T2 (second) has elapsed since the hook selection was changed. Next, at step 21, TB (signal from the tension detector) and θB (signal from the angle detector) are read. At step 22, W (suspension load) is calculated. (Rated load). Next, at step 24, W (hanging load) becomes WL
(Rated load) is monitored. If it is determined that the movement has been exceeded, a stop (signal for automatically stopping the operation of the crane) is output in step 25. If it is determined that the time has not exceeded, the stop (signal for automatically stopping the operation of the crane) is canceled in step 26. At this time, if the attachment configuration information changed in step 1 or the selection of the hook changed in step 9 is incorrect, it is recognized in step 24 that W (hanging load) exceeds WL (rated load). , Stop (signal for automatically stopping the operation of the crane) may be output. Therefore, in addition to looking at the attachment configuration information, the hanging load, the rated load, and the like displayed on the display unit 7, the operation of the crane may be stopped due to a stop.
It can be seen that the selection of the attachment configuration information changed in step and the hook changed in step 9 are incorrect. Next, at step 27, it is monitored whether the load history management data recording condition is satisfied. If it is recognized that the condition is satisfied, FLAG1 = 1 and FLA
It is monitored whether G2 = 1. If FLAG1 = 1 and FLAG2 = 1, it is determined that the attachment configuration information and the hook selection are correct.
The TA (load history management data) is sent to the load history management data recording unit 5 and recorded. In step 28, FLAG1 = 1 and FLA
If G2 = 1 is not satisfied, it is determined that the attachment configuration information or hook selection is incorrect, and the load history management data is not recorded. By operating as described above, if there is an error in a part depending on the setting or selection of the operator, it is possible to prevent the data from being recorded by the load history management function. According to the present invention, it is possible to improve the reliability of data recorded by the load history management function provided in the overload prevention device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an overload prevention device with a load history management function according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a configuration of a crane attachment. The first half of a flowchart illustrating the operation of the overload prevention device with a load history management function according to the embodiment. [FIG. 4] The second half of the flowchart illustrating the operation of the overload prevention device with a load history management function according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 Overload prevention device 2 Attachment configuration information device 3 Hook selection device 4 Calculation / input / output device 5 Load history management data recording unit 6 Rated load storage unit 7 Display unit 8 Hook

Claims (1)

(57) [Claims] (1) Attachment configuration information setting device for setting the state of the attachment, (b) Hook selection device for selecting a hook hanging a load, (c) A calculation / input / output device that calculates whether a suspension load is calculated from at least the information provided by the attachment configuration information setting device and the hook selection device, and monitors whether or not it may be recorded as load history management data; and (d) the calculation / input / output device. A load history management data recording unit that records load history management data sent from the input / output device; and (e) a rated load storage that stores a rated load corresponding to information provided by the attachment configuration information setting device and the hook selection device. And (f) a display unit for displaying at least the attachment configuration information, the hanging load and the rated load given by the calculation / input / output device, g) The arithmetic / input / output device compares the calculated hanging load with a rated load given from the rated load storage unit, controls output of a signal for automatically stopping operation of the crane, and includes attachment configuration information. Is changed
T1 (seconds) have passed since then and the hook selection has changed
When the load history management data storage condition that T2 (seconds) elapses is satisfied, the load history management data is sent to the load history management data recording unit. .