JP4878931B2 - Load weight measuring device for cargo handling vehicles - Google Patents

Description

  The present invention relates to an apparatus for measuring the weight of a load in a cargo handling vehicle, and more particularly to a technique that can accurately measure the weight of a load loaded in a container.

  2. Description of the Related Art Conventionally, in a cargo handling vehicle in which a container is loaded and unloaded freely, there is the following device as a device for measuring the weight of a load loaded on the container (see, for example, Patent Document 1). Specifically, the weight of the load is converted by tilting the container at a predetermined constant angle and measuring the hydraulic pressure acting on the dump cylinder in this state.

Then, for the purpose of accurately measuring the weight of the load on the site with higher accuracy than the weight measurement by the above-described device, the cargo handling device is a first predetermined container regardless of the container loading operation. And the second position are configured to be displaceable, and the weight of the container is measured based on the load acting on the dump cylinder at the first position and the second position. (For example, see Patent Document 2).
JP-A-8-233640 JP-A-2005-75171

  However, in the above conventional apparatus, it takes time to measure the weight because the container is moved to the predetermined first position and the second position separately from the loading operation of the container to measure the weight of the container. However, there was a problem that quick response was not possible at the site.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to carry a load in a cargo handling vehicle that can quickly and easily measure the weight of a highly accurate and accurate load on the spot. It is to provide a weight measuring apparatus.

In order to achieve the above object, a load weight measuring apparatus for a cargo handling vehicle according to a first aspect of the present invention loads and unloads a container between a vehicle body and the ground by an extension and contraction operation of a dump cylinder provided in the cargo handling apparatus. In a freely handling vehicle, a support roller for smoothly loading and unloading the container between the vehicle body and the ground is provided at the rear end of the vehicle body, and the support roller acts on the support roller. A measuring means for measuring the weight of the container is provided, and further includes an arithmetic device for calculating the weight of the container based on a detection result by the measuring means, wherein the arithmetic device separates the container from the ground during the loading of the container. It is configured to calculate the weight of the cargo in the container based on the peak value of the measured weight when balancing the support rollers as the fulcrum Than is.

  ADVANTAGE OF THE INVENTION According to this invention, the weight of the load loaded into the container can be measured with a sufficient precision, and it can be easily applied also to the existing cargo handling vehicle. In addition, accurate weight measurement of the load can be performed quickly and easily using the normal loading operation of the container, so that accurate weight measurement of the garbage (load) can be easily performed at the collection site. This can greatly contribute to the charge for collecting garbage.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a cargo handling vehicle equipped with a container.

  The cargo handling vehicle is provided with a cargo handling device 2 for loading and unloading the container C between the vehicle body 1 and the ground and discharging the load in the container C.

  The cargo handling device 2 includes an outer arm 21 that is horizontally disposed in a state where the container C is mounted, and a telescopic arm 22 that is formed in a substantially L shape having a vertical portion 22b that is vertically disposed in the same state. Yes.

  The rear end of the outer arm 21 is rotatably supported via a dump frame 2a that is rotatably supported at the rear portion of the vehicle body 1.

  The telescopic arm 22 is formed in a substantially L shape by a horizontal portion 22a inserted into the outer arm 21 and a vertical portion 22b erected from the front end portion of the horizontal portion 22a. The horizontal portion 22a is shown in the figure. The outer arm 21 can be extended and contracted in the longitudinal direction by a non-extending cylinder.

  The vertical portion 22b is provided with a hook 23 that can be freely engaged with and disengaged from an engagement pin C1 provided on the container C at the tip thereof.

  Further, a dump cylinder 24 (see FIGS. 3 to 5) is connected between the outer arm 21 and the vehicle body 1, and the cargo handling device 2 is centered on the rear end portion by the expansion and contraction of the dump cylinder 24. And is configured to be rotatable in the front-rear direction.

  As the container C, an open type whose upper surface is opened or a sealed type whose upper surface is also closed is used, and the rear wall can be opened and closed so that the load can be discharged. In addition, the engaging pin C1 is provided at the upper part of the front wall, the support leg C2 is provided at the front part of the bottom surface, and the roller C3 is provided at the rear part of the bottom surface.

  Furthermore, a support roller 11 for smoothly loading and unloading the container C between the vehicle body 1 and the ground is provided at the rear end portion of the vehicle body 1.

  The loading / unloading of the container C by the loading vehicle is performed with the horizontal portion 22a of the telescopic arm 22 being moved from the outer arm 21 by the telescopic cylinder as shown in FIG. The container C on the vehicle body 1 is slid backward by a predetermined length. Thereafter, the container C is tilted by rotating the outer arm 21 together with the telescopic arm 22 from the dump cylinder 24 as shown in FIG. As a result, the container C can be lowered from the top of the vehicle body 1 to the ground as shown in FIG. Further, the container C on the ground can be loaded (lifted) onto the vehicle body 1 by the reverse operation to that described above.

  On the other hand, when discharging the load loaded in the container C, the outer arm 21 and the dump frame 2a are tied together by a securing device (not shown) with the container C loaded on the vehicle body 1. Then, without retracting the telescopic arm 22 with respect to the outer arm 21, as shown in FIG. 5, the entire cargo handling device 2 is rotated upward to tilt the container C, thereby discharging the load in the container C. To do.

  By the way, the above-described cargo handling vehicle is equipped with a load weight measuring device which is a main part of the present invention for measuring the weight of the load loaded on the container C.

  As shown in FIG. 6, the weight measuring device calculates the weight of the load cell 3 as a measuring means for measuring the weight (load) acting on the support roller 11 and the detection result of the load cell 3. And a display device 5 for displaying the calculation result.

  As shown in FIGS. 7 and 8, the load cell 3 is provided on the vehicle body 1 by being disposed at the bottom of a bearing 13 that supports a roller shaft 12 connected between the left and right support rollers 11. The weight of the container C acting on is measured through the roller shaft 12 and the bearing 13.

  The calculation device 4 includes a calculation unit 41 to which a measurement signal from the load cell 3 is input, and a storage unit 42.

  In addition to the measurement signal from the load cell 3, the calculation unit 41 also receives a container unloading signal from the operation unit 6. In the calculation unit 41, the measurement signal from the load cell 3 input by the unloading signal is input. Based on the above, the weight of the container C is converted through the storage unit 42 as described later, and the result is output to the display device 5. That is, the weight measurement is started in accordance with the unloading operation of the container C that is activated by the operation signal from the operation unit 6.

  Here, the measurement principle by this weight measuring apparatus will be described.

  When the container C is loaded (pulled up), the change in the weight of the container C measured by the load cell 3 with the change in the attitude of the container C is as shown in FIG.

  That is, the area A in FIG. 9 is a state in which the container C is placed on the ground as shown in FIG. 4. In this case, the load of the container C is not applied to the support roller 11, so The measured weight is zero.

  9, the container C is gradually lifted from the ground by the cargo handling device 2 so that the container C is supported by the support roller 11 as shown in FIG. 3 and only the roller C3 at the rear end is grounded. In this case, although the load of the container C is acting on the support roller 11, a part of the load of the container C is also acting on the cargo handling device 2 and the ground.

  A point B2 in FIG. 9 is a state when the container C is separated from the ground during the loading of the container C and the container C is balanced with the support roller 11 as a fulcrum (for example, the center of gravity of the container C as shown in FIG. 10). W is a state arranged on a vertical line passing through the center of the support roller 11), and in this case, all the loads of the container C act on the support roller 11.

  Next, a point B3 in FIG. 9 is a state in which the container C is pulled to the upper side of the vehicle body 1 than the state shown in FIG. 10 described above during the loading of the container C (see FIG. 11). 11, the load of the container C is acting, but a part of the load of the container C is also acting on the cargo handling device 2.

  Finally, a point B4 in FIG. 9 is a state in which the container C is arranged on the vehicle body 1 as shown in FIG. 2. In this case, although the load of the container C is acting on the support roller 11, the container C A part of the load also acts on the vehicle body 1.

  That is, the weight measured by the load cell 3 at the point B2 at which all of the weight of the container C acts on the support roller 11 peaks, and this is converted as the weight of the container C, and the weight of the container C itself is calculated from the weight thus converted. By subtracting the weight, it is possible to measure the weight of the garbage (loading object) loaded in the container C.

  The weight of the container C itself is stored in advance in the storage unit 42 for each type of the container C, or is peaked by the load cell 3 in the same manner as described above when the empty container is lowered to the ground. And the weight value may be stored in the storage unit 42 after the empty container is specified.

  As described above, by measuring the weight of the garbage loaded on the container C based on the change in the weight of the load cell 3 during the loading operation of the container C, there is no need to measure while changing the position of the container as in the prior art. Thus, the weight measurement can be performed quickly and easily.

  Note that the above-described embodiment is merely a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope thereof.

  For example, when the support roller 11 is divided and provided on the left and right, the load cell 3 is also provided on the left and right correspondingly, and loaded on the container C in the same manner as described above based on the weight measured by the left and right load cells 3 What is necessary is just to measure the weight of the garbage which was carried out.

1 is a schematic side view showing an overall configuration of a cargo handling vehicle. It is a side view for demonstrating the container unloading operation | movement of a cargo handling vehicle. It is a side view for demonstrating the container unloading operation | movement of a cargo handling vehicle. It is a side view for demonstrating the container unloading operation | movement of a cargo handling vehicle. It is a side view for demonstrating discharge operation | movement of the load loaded into the container of a cargo handling vehicle. It is a block diagram which shows the structure of the weight measurement apparatus of a load. It is the schematic which shows the attachment state of a load cell. It is XX sectional drawing in FIG. 7 for showing the attachment state of a load cell. It is a characteristic view which shows the change of the container weight measured with a load cell at the time of container loading. It is a figure which shows the state in the middle of loading for demonstrating the principle of weight measurement. It is a figure which shows the state in the middle of loading for demonstrating the principle of weight measurement.

Explanation of symbols

1 Car body 11 Support roller 2 Cargo handling device 24 Dump cylinder 3 Load cell (measuring means)
C container

Claims (1)

In a cargo handling vehicle in which a container can be freely loaded and unloaded between a vehicle body and the ground by an expansion and contraction operation of a dump cylinder provided in the cargo handling device, the container is placed between the vehicle body and the ground at a rear end portion of the vehicle body. A support roller for smoothly loading and unloading is provided, and the support roller is provided with measuring means for measuring the weight of the container acting on the support roller, and the weight of the container based on the detection result by the measuring means. The computing device calculates the weight of the load in the container based on the peak value of the measured weight when the container is separated from the ground and balanced with the support roller as a fulcrum during the loading of the container. weight measuring device of the cargo in the cargo vehicle, characterized in that it is configured to calculate a.

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