JPH0570091B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a load amount device capable of calculating the bucket load amount of a loading machine such as a loader by subtracting the weight of residual materials.

[Conventional technology]

In order to measure the load amount of the loader bucket, the hydraulic pressure of the cylinder system for holding the bucket or the stress of the bucket linkage system is detected when the bucket is lifted during cargo handling/loading, and based on the detected data, the total weight of the cargo inside the bucket is calculated electronically. The present applicant has already developed a cargo handling/loading weight monitoring system disclosed in Japanese Patent Application Laid-Open No. 162816/1983 as a system for measuring the weight of cargo. In the case of this system, the value obtained by subtracting the weight equivalent of the empty bucket cart itself from the hydraulic pressure or stress detection data is regarded as the actual load loaded by the bucket cart onto a transporter such as a dump truck, and the difference value is calculated by a coefficient. The loading weight on the transporter is calculated by multiplying by . Therefore, the calculation in this case is based on the assumption that the bucket is completely emptied each time the transporter is loaded. However, if the cargo in the bucket is sticky, such as clay or wet soil, residual soil will remain inside the bucket after it is loaded into the transporter. For this reason, the actual amount loaded into the transporter by the bucket is reduced by the amount of soil stuck inside the bucket. This phenomenon continues as long as there is residual soil in the bucket, so the data on the load weight calculated as described above can be used not only to prevent vortex loading onto the transporter, but also to manage the amount of loading work into the transporter. When using this method, the influence of the error calculation due to the residual soil amount can be ignored. In particular, when the above system is applied to a loading machine that mixes multiple materials such as wall soil and cement,
This results in a large difference in the material mixing ratio, which has an undesirable effect on the material mixing state of the product. On the other hand, an automatic weighing error correction method disclosed in Japanese Patent Application Laid-open No. 119664/1983 discloses a configuration in which an error due to the weight of a residual substance in a weighing machine is subtracted for each measurement (batch weighing). However, with the above configuration, the weight of the remaining items is measured every time, so if this is used for weight measurement using a bucket, it takes time to measure the weight of the remaining items, which has the disadvantage that weight measurement cannot be carried out efficiently. .

[Problems to be solved by the invention]

This invention was devised by focusing on the fact that when measuring the load on a bucket, the weight of the residue that adheres to the bucket is almost constant during a series of operations in which a predetermined amount of the same cargo is loaded onto a transport vehicle, etc. Therefore, the main purpose of this invention is to measure the weight of the stuck residue in the bucket once when measuring the loaded weight, and to subtract the error due to the residue each time the loaded weight is measured. The goal is to efficiently measure the amount of cargo load.

[Means to solve the problem]

In order to achieve the above object of the present invention, a sensor for detecting the height position or tilt angle of the bucket cart installed in a loading machine, and a sensor for detecting the hydraulic pressure of the cylinder system for holding the bucket cart or the stress of the bucket linkage system are provided. In a cargo load measuring device, the device includes a sensor for calculating a cargo load in a bucket, a means for calculating a cargo load in a bucket based on data input from these sensors, and a storage means for storing data of the calculation result. , (a) It is equipped with a function stop switch and a total loading amount display switch or a loading tonne number setting switch, (b) A loading device that calculates the loading amount in the bucket in the loaded state based on the input data from each sensor. (c) Providing a weight calculation means for calculating the weight of the remaining material adhering to the empty bucket after the load is discharged based on the input data from each of the sensors when the function stop switch is turned on; (d) subtracting means for storing the calculated weight value of the remaining material once and subtracting the weight value of the remaining material from each cargo weight value obtained by the cargo weight calculating means each time the cargo is loaded; (e) storing the value obtained by the subtraction means as a net weight value, and adding the calculated load amount each time a bucket is loaded until the total load amount display switch is turned on; or (f) Provide calculation means for subtracting the loading weight from the scheduled total weight each time a bucket is loaded, when the total weight to be loaded is set in advance using a loading capacity setting switch; A technical measure is taken to provide a data output means for display.

[Effect]

The cargo load calculation means calculates the cargo load in the bucket, and then, when the function stop switch is turned on, the residual material weight calculation means calculates the weight of the remaining material adhering to the empty bucket after the cargo is discharged. The calculated weight value of the remaining material is stored, and a subtraction means subtracts the weight value of the remaining material from the cargo weight value obtained by the cargo weight calculation means to calculate and store the net weight value. I'll keep it. When the cargo weight calculation means calculates the cargo weight in the bucket again, the subtraction means reads the weight value of the remaining object and subtracts it from the cargo weight value. Then, the calculation means sequentially adds the calculated and stored weight values or sequentially subtracts them from a predetermined value. Furthermore, the calculated load amount is added each time a bucket is loaded until the total load amount display switch is turned on. To prevent overloading, set the total weight to be loaded in advance using the loading weight setting switch.
Each time a bucket is loaded, the loaded weight is subtracted to calculate the remaining weight. This calculation result is displayed externally by the data output means.

【Example】

Preferred embodiments of the load measuring device of the present invention will be described below with reference to the drawings. First, in the loader-type loading machine 1 shown in FIG. This is a well-known configuration in which the bucket 4 is tilted through the bucket. In such a bucket cart device, the lifting height position of the bucket cart 4 in a loaded state and the oil pressure of the lift cylinder 3 in a state where the cargo load is applied have a certain correlation with the amount of the cargo load of the bucket cart 4. From the correlation, if the oil pressure value of the lift cylinder 4 at a specific extension point is detected,
The actual load amount in the bucket bag 4 can be determined from the detected value. For this reason, the apparatus of the present invention, in the embodiment shown in FIG. We are prepared. These sensors 7, 8 are connected to A/D converters 9, 10.
It is connected to the sensor input mechanism 12 of the CPU 11 via. In addition to the sensor input mechanism 12, the CPU 11 includes a power supply mechanism 13, a load conversion mechanism 14, a parameter input mechanism 15, and an output device drive mechanism 16. The power supply mechanism 13 is connected to a battery V mounted on the loading machine 1 via a power switch 13A, and the system is activated by turning on the switch. The loading amount conversion mechanism 14 is a calculation means for calculating the amount of loading inside the bucket 4 based on data signals inputted from the sensors 7 and 8 through the A/D converters 9 and 10 and the sensor input mechanism 12. It has a storage means 17. The load conversion mechanism 14 is configured to operate the output device 18 via the output device drive mechanism 16 based on the output signal of the calculation result. The output device 18 in the illustrated example is the digital display 1
8A and a printer 18B. In addition to the weight display section 19, the digital display 18A includes lamps 20 to 22 for displaying loading status, a loading volume setting switch 23, a tolerance setting switch 24, a total loading amount display switch 25, and a function stop switch. 26 are each in the configuration shown provided on the front panel. The lamps 20 to 22 are means for displaying whether or not the load in the bucket 4 is appropriate for a transporter such as a dump truck. For this reason, the red lamp 20 serves as an alarm that lights up or flashes when the cargo in the bucket 4 is overloaded.
A green lamp 21 is lit or blinks when the load is appropriate, and a yellow lamp 22 is lit or blinks when the load is insufficient. Therefore, the weight display section 19 in the digital display 18A, the lamps 20 to 22, and the printer 1
8B are each connected to an output end of the output device drive mechanism 16. Further, each of the switches 23 to 26 is connected to a parameter input mechanism 15, and the mechanism 15 is also connected to external input means 27 such as a keyboard. This external input means 27 is for setting and program control of various data such as the vehicle identification number and operation code number of the transporter, customer name, cargo handling product name, specific gravity and moisture content of cargo handling. In the above configuration, when loading work using the loader basket 4 is started with the power switch 13A turned on and the other switches 23 to 26 turned off, the lifting height position of the loaded bucket 4 is detected by the position sensor 7. At the same time, the hydraulic pressure of the lift cylinder 3 at that position is detected by the pressure sensor 8. These detection signals are converted into digital signals by A/D converters 9 and 10 and input to the input mechanism 1 of the CPU 11.
The load amount conversion mechanism 14 inputs the data via 2. At this time, the loading amount conversion mechanism 14
A conversion formula is called from , and the amount of cargo load in the bucket 4 is calculated based on the hydraulic pressure of the lift cylinder 3. The resulting load weight value is temporarily stored in the storage means 17, and at the same time is digitally displayed on the weight display section 19 of the digital display 18A by actuation of the drive mechanism 16 based on the output signal from the load conversion mechanism 14. Ru. The cargo in the bucket cart 4 whose load amount has been measured is then loaded onto a transporter, for example, a dump truck. After loading, the bucket 4 is lifted down to scoop up a new load and then lifted up, so that its height position and the hydraulic pressure of the lift cylinder 3 are detected again by the sensors 7 and 8. Ru. By inputting the detection data to the load amount converting mechanism 14, the mechanism 14 calculates the amount of load inside the bucket bag 4, as in the case described above. In this case, the loading amount conversion mechanism 14 is
The previous load amount value is called from , and the current load amount value is added to it. This addition is repeated every time the bucket 4 is loaded unless the total loaded amount display switch 25 is turned on. The added weight for each loading circuit is digitally displayed on the strength and weight display section 19. After repeating this loading operation an appropriate number of times, when the total loaded amount display switch 25 is turned on, the printer 18 is activated and the total loaded weight of the bucket loader to the transporter is recorded. The above is a case where the actual weight loaded onto a dump truck is calculated and measured without presetting the total weight to be loaded onto the dump truck. Therefore, when loading the desired weight within the maximum loading capacity of a dump truck or within its range,
By setting the total weight to be loaded in advance using the tonnage setting switch 23, overloading of the dump truck can be prevented. In this case, the allowable range setting switch 24 also presets the allowable error weight of the total loading amount for the dump truck. These set values are stored in a storage means 17 which is inputted from the switches 23 and 24 via the parameter input mechanism 15. In this case, the set loading weight is digitally displayed on the weight display section 19. In this state, when loading work using the bucket 4 is started, the loading amount conversion mechanism 14 detects the sensor 7,
The amount of cargo load inside the bucket bag 4 is calculated by performing calculations based on the input signal from 8. The resulting cargo load value is digitally displayed in the number of tons on the weight display section 19. In this way, the cargo in the bucket cart 4 is loaded onto the dump truck, and the load in the bucket cart 4 is calculated each time the loading is repeated. The cargo load value is added each time to the previous cargo load value, and the total weight loaded onto the dump truck at that point in time is calculated. This total loaded weight is compared with the set number of loaded tons. That is, the loading amount conversion mechanism 14 is
The set loading capacity is retrieved from the set value, and the actual total loaded weight is subtracted from the set value to calculate the remaining loading amount for the dump truck. As a result, it is determined whether the load in the bucket cart 4 is appropriate for the dump truck. To be more specific, if the set number of loading tons is not reached even after repeatedly loading the cargo in the bucket cart 4 into the dump truck, the yellow lamp 22 lights up or flashes in response to a signal from the output device drive mechanism 16. do. Therefore, as long as the yellow lamp 22 is on or flashing, the loader operator can continue to smoothly load the dump truck without worrying about underloading or overloading. By repeating the loading operation, the green lamp 21 lights up or blinks if the load in the bucket 4 just before the end of loading into the dump truck is the appropriate weight for the dump truck. Therefore, in this case, by loading the cargo in the bucket truck 4 as it is onto the dump truck, the actual total weight loaded onto the truck becomes an appropriate weight value that matches the set loading tonne number within the allowable range. The loading work is completed. However, the bucket 4 just before the end of loading
If the cargo inside is overloaded, red light 20
lights up or flashes. In this case, overloading of the dump truck can be prevented by the loader operator discharging the cargo in the bucket cart 4. At the same time, load the cargo into the bucket 4 again according to the remaining loading amount at that time, and after confirming that the loaded weight is appropriate by lighting or blinking the green lamp 21, unload the cargo in the bucket 4. The loading operation is completed by loading the dump truck. By the way, the cargo inside Bucket 4 is clay, wet soil, etc.
If it is a sticky material such as wall mud or cement,
Even if you load it into a dump truck etc.
So-called residual materials such as adhering soil are generated inside. Therefore, in the above-mentioned calculation and measurement of the cargo load amount, an error occurs by the weight of the attached residual cargo. Therefore, in this case, the load in the bucket cart 4 whose first load amount has been calculated and measured by the load converting mechanism 14 in the same way as in the case described above is loaded onto the dump truck, and the empty bucket cart 4 after loading is lifted. When it is down, turn on the function stop switch 26. Then, the empty bucket 4 is lifted up again. Then, the sensors 7 and 8 act, and the signals detected by these sensors are inputted to the loading amount conversion mechanism 14, which calculates the weight of the remaining material attached to the empty bucket 4. That is, this bucket load conversion mechanism 14
As shown in more detail in FIG. 2, there are a function 14A that calculates the amount of the cargo load in the bucket, a function 14B that calculates the weight of the remaining material attached to the empty bucket, and a function that subtracts the weight of the remaining material from the amount of cargo. 14C and
It also has a function 14 for adding up the net loaded weight. Sensors 7 and 8, a function stop switch 26, a total loading switch 25, and a storage means 17 are used as means for realizing these functions 14A to 14D. The storage means 17 includes a conversion formula storage unit 17A for calculating the cargo load amount and a subtraction formula storage unit 17B.
and an addition type storage section 17C. In such a load amount conversion mechanism 14, the load amount calculation function 14A detects the height position and the oil pressure of the lift cylinder 3 when the loaded bucket 4 is lifted to the height position for loading onto a dump truck or the like. The conversion formula is called from the conversion formula storage section 17A based on the input signals from the sensors 7 and 8, and the cargo load inside the bucket bag 4 is calculated as described above. The resulting weight value is stored in the subtractive storage section 17B and displayed on the weight display section 1 of the digital display 18A.
9 will be displayed. The residual weight calculation function 14B calculates the weight from the conversion formula storage unit 17A using input signals from the centers 7 and 8 when the empty bucket 4 is lifted down after being loaded onto a dump truck or the like and then lifted up again. A conversion formula is called to calculate the weight of the remaining material attached to the empty bucket 4. The resulting weight value is digitally displayed on the weight display section 19 and simultaneously stored at a designated location in the subtractive storage section 17B. The subtraction function 14C calls a subtraction formula from the subtraction formula storage section 17B in response to a command signal generated by turning on the total loading amount switch 25, and subtracts the weight value of the remaining material from the first loading amount value. The subtracted answer value becomes the net weight value actually loaded on the dump truck, and this weight value is digitally displayed on the weight display section 19 and stored in a designated location in the addition type storage section 17C. Then, the net loaded weight value is
The calculation is performed each time loading onto the dump truck is repeated, and each time the calculation is performed, it is sequentially stored in a designated location in the addition formula storage section 17C. The addition function 14D calls up the addition formula from the addition formula storage section 17C each time the dump truck is loaded, and adds the net loaded weight value calculated repeatedly as described above. In this way, the net total loaded weight actually loaded onto the dump truck is calculated, and it is digitally displayed on the weight display section 19 and also displayed on the printer 18.
It will be printed out at B. In the above, the weight value of the remaining material is measured once and stored in the storage means 17, and the stored weight value is recalled every time the load amount in the bucket 4 is calculated. There is no need to raise and lower the empty bucket 4 in order to calculate and measure the weight of the remaining material each time the process is repeated. In the above embodiment, the lifting height position of the bucket 4 and the oil pressure of the lift cylinder 3 are detected by the sensor 7,
8, but these sensors may be replaced with a sensor for detecting the oil pressure of the tilt cylinder 5 or the stress of the tilt linkage, and a sensor for detecting the tilt angle of the bucket 4. Similar effects can be obtained in any case.

【Effect of the invention】

As described above, according to the configuration of the present invention, not only the amount of cargo load in the bucket is calculated, but also the weight of the residue attached to the bucket after the cargo is discharged is measured, and the weight of the remaining material is subtracted from the amount of cargo load. Since the net weight of the cargo discharged from the bucket can be calculated as the net weight of the cargo discharged from the bucket, it is possible to eliminate measurement errors in the amount of cargo load caused by adhering residues on the bucket. The weight of this adhering residue can be measured only once during a series of measurements in which the cargo load is accumulated or subtracted from a predetermined value. Since it is automatically subtracted when measuring the amount of cargo in the bucket, there is no need to measure the weight of the remaining material each time the amount of cargo in the bucket is measured, and the measurement work can be carried out quickly and efficiently. Therefore, the measurement accuracy of the device of the present invention is improved, and it greatly contributes to the management of workload even in the field of bucket carts that handle sticky loads.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention; FIG. 1 is a block diagram of the entire device, FIG. 2 is a block diagram showing a functional flow, and FIG. 3 is a flowchart.

Claims (1)

[Claims] 1. A sensor for detecting the height position or tilt angle of a bucket cart installed in a loading machine, a sensor for detecting oil pressure of a bucket holding cylinder system or stress of a bucket linkage system, In a cargo load measuring device that is equipped with means for calculating the cargo load in a bucket based on data input from these sensors and a storage means for storing data of the calculation results, a function stop switch is provided. and a total loading amount display switch or a loading tonnage setting switch, and a loading amount calculating means for calculating the loading amount in the bucket in the loaded state based on the input data from each sensor, and the function stop switch. a residual weight calculating means for calculating the weight of the residual material adhering to the empty bucket after the load is discharged based on the input data from each of the sensors at the time of loading; and storing the calculated weight value of the residual material once. subtracting means for subtracting the weight value of the remaining material from each cargo weight value obtained by the cargo weight calculation means for each loading; and storing the value obtained by the subtraction means as a net weight value. , until the total loading amount display switch is turned on, the calculated loading weight is added each time the bucket is loaded, or if the total weight to be loaded is set in advance using the loading tonne setting switch, the total weight is calculated for each bucket loaded. A cargo load measuring device comprising: a calculation means for subtracting the loaded weight from the scheduled total weight; and a data output means for externally displaying the calculation result.