JPS5956120A - Load weight detector for loading vehicle - Google Patents

Abstract

PURPOSE:To grasp load weight accurately and to peform loading of desired load weight by detecting the load weight when a load is loaded on a transport vehicle by a loading vehicle. CONSTITUTION:When the bucket of the loading vehicle reaches a specific elevation position, that is deteted by a limit switch and supply hydraulic pressure to the lift cylinder of the bucket is detected by a hydraulic pressure sensor 1. Its detected hydraulic pressure signal is transmitted to a main frame 6 to detect the weight of a load is the bucket. The detected weight is integrated automatically and outputted to a display 7 and a printer 8. When a cancel switch is turned on, the weight of th load in the bucket is subtacted from the integral value on every charge.

Description

[Detailed description of the invention] The present invention relates to a cargo load amount detection device for a loading vehicle.

For transport vehicles such as dump trucks, it is necessary to accurately understand the load status in order to ensure safety (reducing vehicle troubles by preventing overloading), proper vehicle operation, maintenance, etc. .

The conventional method of measuring the cargo load of a transport vehicle is to measure the weight of the vehicle including the cargo MWw using a large installed (stationary) platform, and then calculate the cargo load by subtracting the vehicle's own weight from the measured value. was taken.

However, such a measurement method has the following problems.

(1) The needle rat device is large and is subject to restrictions on installation location.

(2) Installation of the sound device requires a large amount of cost and maintenance inspection.

(3) Extra travel to the location where the weighing device is installed (increase in transportation distance).

(4) There is a waiting time for the hedgehogs, which reduces work efficiency.

(5) Overloading cannot be prevented because weighing is performed after loading.

The present invention has been made in view of the above-mentioned circumstances, and by detecting the load I when the load is loaded onto the transport vehicle by the loading vehicle, it is possible to constantly grasp the load amount of the transport vehicle and the desired load amount. It is an object of the present invention to provide a cargo load amount detection device for a loading vehicle that is capable of loading.

According to the present invention, each time a packet of a loading vehicle reaches a predetermined raised position, the oil pressure supplied to the lift cylinder of the packet at the raised position is detected, and the packet is stored in the packet based on this detected oil pressure. The weight of the loaded cargo is detected. Then, the detected vehicle tatY is automatically accumulated, and when the cancel switch is turned on, the weight tv of the cargo currently accommodated in the packet is subtracted from the accumulated value every time the cancel switch is turned on. By displaying the weight and the weight of the cargo currently accommodated in the packet and sequentially printing out the calculation process, it is possible to accurately grasp the cargo weight and load the desired cargo weight.

The present invention will now be described in detail with reference to the accompanying drawings.

First, the principle of cargo load amount detection applied to the device of the present invention will be explained. There is a relationship shown in FIG. 1 between the hydraulic pressure supplied to the lift cylinder that lifts up the packet loaded in the loading vehicle and the weight of the cargo contained in the packet. Here, if the cylinder oil pressure (1-X) and the load capacity is Y, the above relationship is expressed as Y=AX 10B.A and B are determined by the height of the packet above ground and the load capacity of the loading vehicle. is a constant.

Figure 2 shows that the above relationship differs depending on the height of the packet above the ground and its rising position, and also differs depending on whether the packet is kept stationary at a specified height or when the packet is allowed to pass through the specified height while being raised. There is. By the way, is the graph shown by the broken line in Figure 2 a relationship multiplied by 8 when stationary? The solid line graph shows the relationship during the rise.

That is, the lift/
By measuring the oil pressure supplied to the cylinder, it is possible to detect the load amount of the packets.

FIG. 3 is a side view of a wheel loader to which the device of the present invention is applied, in which the oil pressure sensor 1 is attached to the lift cylinder 30 position P1 that lifts the packet 2, and the limit switch 4 for detecting a predetermined rising position tv of the packet 3 is attached to the lift arm. The main body 62 display unit 7. is attached to the 5th digit tffi P and will be described later. The printer 8 is installed at a position P in front of the driver's seat.

FIG. 4 shows a schematic configuration of the apparatus of the present invention, in which the oil pressure sensor 1 detects the oil pressure supplied to the lift cylinder 3 and applies an electric signal corresponding to the pressure to the main body 6. The limit switch 4 is a one-way detection type, and is turned on when the lift arm 5 reaches a predetermined raised position and sends a pulse signal to the main body 6.
Add to.

As shown in FIG. 5, the main body 6 includes an A/D converter 61 and an arithmetic unit 62. Data latch 63. It is composed of an accumulator 64 and the like, and the electric signal input from the oil pressure sensor 1 is A/
The signal is applied to the D converter 61, where it is converted into a digital signal and applied to the arithmetic unit 62.

The computing unit 62 computes the weight of the cargo contained in the packet 2 based on the input digital signal, data measured in advance from the wheel loader's position, the position of the packet 2, and the like. In addition, assuming that the input digital signal X1 is pre-measured data A and B, the arithmetic unit 62 performs the above-mentioned calculation,
Perform AX-1-B4.

When a signal is input from the limit switch 4, the data latch 63 latches the data calculated by the arithmetic unit 62, outputs this data to the accumulator 64Vζ, and also outputs it to the display 7 and the input terminal 8, which will be described later. The accumulator 64 sequentially accumulates the data latched by the data latch 63, and outputs the accumulated value to the display 7 and printer 8.
'-When it is turned on, it clears the accumulated value and displays the display 7, which will be described later.
When a signal is applied from the cancel switch 73, the latched data is subtracted from the accumulated value, and when a signal is applied from the measurement interrupt switch 74, the accumulation is stopped.

The display 7 (Fig. 4) displays the weight of the cargo currently stored in the packet 2 and the cumulative load amount based on the data added from the main body 6, and also displays the above-mentioned information on the main body 6 by operating a switch. Output a signal. Then, the printer 8 prints the load amount and total N amount, etc. by the Kerato 2 each time, on the recording paper.

FIG. 6 is a front view of the main body 6 according to the present invention, and the panel surface includes a power switch 65 and an operation check switch 66.
, a clear switch 67, and adjustment screws 68 and 69 are provided. First, by turning on the power switch 65 and then pressing the clear switch 67 (see FIG. 5), measurement preparation b1 is completed. Operation check switch 6
6. Adjustment screws 68 and 69 are not normally operated;
(When replacing the kerato or repairing the hydraulic pump or cylinder, the main body 60 is operated to calibrate it.) Here, a method for calibrating the main body 6 will be explained.

First, the power switch 65 and clear switch stone 7 are turned on. Next, stop the engine, move the work equipment Reno (-), and set the C cylinder oil pressure to "0".
If the pre-specified value is displayed, the "0 point" adjustment is normal, but if the short value is not displayed, the image distortion screw 68
Turn with a screwdriver to adjust to the specified RUN (Q point) value. Next, turn on the check switch 66 (RATB 1ill) ', l If the display 7 displays the pre-specified value, the adjustment of "load resistance" is normal; if the specified value is not displayed. Image distortion screw 69
Turn it with a 1'2 screwdriver to adjust it to the specified value for RATE (under load).

: FIG. 7 is a front view showing an example of the display device 7 according to the present invention, in which the display section 71. displays the cumulative measured value (0000,0 to 9999.9). Measured value each time c o o, o, T”
-99.9 T OM ) is displayed on the display section 72. Cancel switch 73. A measurement interrupt switch 74 is provided. The cancel switch 73 is operated when the scooping is repeated or when the truck is left unloaded (details will be described later), and each time it is pressed, the measured value displayed on the display section 72 A signal is applied to the main body 6 to subtract the value from the cumulative measurement value displayed on the display section 71. The measurement interrupt switch 74 is turned on when the wheel loader is performing work other than loading work, for example, when the wheel loader is performing two works such as scraping away scattered earth and sand, and when the switch 74 is turned on, A signal is applied to the main body 6 so that the measured values displayed on the display section 72 are not accumulated.

FIG. 8 is a front view showing an example of the printer 8 according to the present invention, and shows the date setting switch 81. Vehicle number setting switch 8
2. Printout switch 83°Feed switch 8
4th class is provided.

Next, the use of the apparatus of the present invention will be explained with reference to the recording paper printed by the printer 8 shown in FIGS. 9 to 11.

Figure g9 shows the record sheet printed by the printer 8 after the loading operation has been carried out in the usual manner. First, the date of the loading operation and the vehicle number are printed, and then the record sheet for each loading operation is printed. -, illit are printed, and finally, the word "sodangome jujutsu" is printed. FIG. 1O shows the recording paper in the case of re-reading. rooIJ~r0
When it is confirmed on the display section 71 of the display 7 that the cumulative measurement value of 04J exceeds the loading weight of the truck (92TON of r004j is not loaded on the truck at this stage), First, press the gear/cell switch 73 on the display 7 once to subtract the current measured value 92-d1 from the cumulative d1 value (r 005 J), then press the -r of the bucket l again to subtract the measured value 4.2 (
r006 J) Quantity system fit. FIG. 11 shows the recording paper when there is an unrecorded record on the track. Loading sound of r004J 10.5 If you continue to load ON during loading, there is a risk of a spillage signal, and if it does not load all the contents, it will remain in the packet. ) Measure the remaining weight by descending Y and raising it again r005j
), then press the cancel switch 73 on the display 7 once to subtract the amount of vehicles 2.9 TON that was automatically accumulated when measuring the remaining weight. Press once to subtract the remaining weight from the total weight (r007J).

As explained above, according to the present invention, it is possible to constantly check the total amount of electricity i that has been accumulated for each loading vehicle and the amount of one load. In addition, if you have to refill the packet to prevent overloading, or if there is leftover baggage left in the packet to prevent the cargo from spilling from the transport vehicle, there is a simple method. You can check the total weight of the loaded vehicle just by operating a switch.
It has the advantage of being extremely easy to handle.

[Brief explanation of drawings]

1 and 2 are graphs used to explain the principle of cargo load detection according to the present invention, and FIG. 3 is a side view of a wheel loader to which the device of the present invention is applied. ; g4 is a schematic configuration diagram of the device of the present invention; FIG. 5 is a block diagram showing a third embodiment of the main body according to the present invention; FIG. 6 is a front view of the main body according to the present invention; A front view showing an example of such a display device,
FIG. 8 is a front view showing an example of a printer according to the present invention, and FIGS. 9 to 11 are plan views of recording paper printed by the printer. 1... Oil pressure sensor, 4... Limit switch, 6...
...Main body, 7...Display unit, 8...Printer, 73.
・Cancel switch. Figure 1 Figure 3 Figure 4 Figure 6 Figure 6r Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (2)

[Claims] (1) A loading vehicle that detects whether the packet 7) has reached a predetermined raised position and detects the stacking of cargo stored in the packet based on the oil pressure supplied to the lift cylinder at the raised position. The cargo load amount detection device automatically accumulates M M:' of the cargo accommodated in the packet each time the packet reaches a predetermined ascending position, and each time the cancel switch is turned on, the amount of cargo accommodated in the packet is accumulated. a calculation means for subtracting the weight M of the cargo currently stored in the packet n from the cumulative value, and a display means for displaying the cargo ′M, ft calculated by the calculation means 811 and the weight 1it′ of the cargo currently accommodated in the packet. A device for detecting the amount of cargo on a loaded vehicle. (2) Detect the amount that the packet has reached the raised position vi, and determine the weight of the cargo accommodated in the packet based on the oil pressure VC supplied to the lift cylinder at the raised position vi. A cargo load amount detection device for a loading vehicle that automatically accumulates the weight of the cargo contained in the packet each time the packet reaches a predetermined ascending position, and each time a cancel switch is turned on, the load amount of the packet is accumulated. a calculation means for subtracting the amount of cargo stored in the bucket from the cumulative value, and a display means for displaying the amount of cargo weight calculated by the previous DD calculation means and the amount of cargo currently stored in the bucket; A cargo flikt detection device for a loading vehicle, comprising a printer that sequentially prints out the calculation process of the calculation means.