JPH0458889B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a load measuring device for a dump truck mounted on a vehicle.

[Conventional technology]

In transportation operations using dump trucks, knowing the weight of cargo loaded on a vehicle is very important for operation management, product management, etc.

However, the mounting structure of the vessel part in the currently used dump truck is as shown in Fig. 12 and 1.
As shown in FIG. 3, the Bethel pins 12 are inserted into the Bethel legs 11, 11 provided on both rear sides of the Bethel 10, and the Bethel 10 is attached to the Bethel frame 13.
The vehicle frame 13 is rotatably attached to the rear of the vehicle chassis frame 14, and the vehicle frame 13 is fixed to the truck chassis frame 14 with bolts or the like. Also, on the upper surface of the vehicle frame 13, there is provided a structure that distributes the load of the vehicle 10 evenly over the entire vehicle frame 13. A dump cylinder 16 for a load dump is disposed on the lower surface of the vessel 10 to lower the load from the rear of the vessel 10. The operation of the cylinder 16 causes the vessel 10 to rotate about the vessel pin 12 as a fulcrum.
Because of the structure in which the Vessel pin 12 supporting the Vessel 10 is fixed to the Vessel frame 13, it was impossible to determine the load on the Vessel 10 alone.

Therefore, as disclosed in U.S. Pat. No. 2,756,983, a long hole in the vertical direction is formed in the Bethel leg provided on the Bethel frame, and a Bethel pin provided in the Bethel is inserted into the long hole. A plurality of supporting cylinders are provided to support the Vessels, and when measuring the amount of cargo load, the Vessels are supported by the cylinders, and the pressure sensed by the cylinders is detected by hydraulic pressure, which is then displayed on an indicator installed in the driver's cab. Some display the amount of cargo load.

Additionally, attempts have been made to develop a vehicle-mounted load measuring device that measures the load from axle case strain, dump cylinder oil pressure, tire air pressure, etc., and a detector is attached to the axle case. Vehicle-mounted load measuring devices have actually been put into practical use, such as by using the strain caused by the load during loading as an output signal, or by measuring the pressure applied to a hydraulic cylinder, or by determining the loaded weight from the strain on the axle case. ing.

Furthermore, as shown in FIG. 11, a truck scale 1 is installed on the ground, and a dump truck 2 is driven onto the truck scale 1 to perform weighing.
There is a method that calculates the load amount from the difference between the weighed value when loaded and the weight of the vehicle when it is empty.

[Problem to be solved by the invention]

However, in the case where a long hole in the vertical direction is formed in the Vessel leg and the Vessel is carried by a carrying cylinder to measure the load, the long hole in the vertical direction is deformed due to vibrations and impacts during transportation. Not only does the Betsusel rotate during dumping operations, but the Betsusel pin interferes with the elongated hole when measuring the load, making it impossible to accurately measure weight.Also, since detection is performed using hydraulic pressure, highly accurate measurements are not possible.

Furthermore, in the case of the type of load measuring device that is currently in practical use and measures the strain of the axle case, the accuracy is extremely low because the structure is designed to deal with problems such as vibration and shock that are unique to dump vehicles. It is something.

Furthermore, when weighing with a truck scale, although the measurement speed is high, the truck scale is expensive and occupies a considerable amount of land, so a minimum number of truck scales are installed in a specific location. Therefore, there is a waiting time because there are few racks to install the truck scale, space is required to install the truck scale, and the truck scale cannot be easily moved. Furthermore, this method has had various problems, such as being ineffective because it requires a trip for weighing during the transportation of the cargo.

The present invention has been made in view of the above-mentioned points, and the Bethel pin is pivotally supported between the Bethel pin and the Bethel pin without being affected by vibrations or shocks during running, so that the Bethel pin is not interfered with when measuring the load amount. The purpose of the present invention is to provide a vehicle-mounted dump truck load measuring device which can carry a vessel smoothly, has a high accuracy equal to or higher than weighing by a truck scale, is inexpensive, and has a simple structure.

[Means to solve the problem]

As a means for solving the above problems, a first aspect of the present invention provides a bearing for supporting a Bethel pin in a Bethel frame, and a fixed lower bearing for supporting a lower half of the Bethel pin. , is provided in the lower bearing so as to be movable in the vertical direction with a jack, and when measuring the load capacity, it moves upward to allow the above-mentioned Bethel pin to move upward, and at other times, it moves downward to allow the above-mentioned Bethel pin to move upward. It is characterized by comprising an upper bearing that supports the upper half, a load cell that converts pressure into an electric signal is provided in the supporting cylinder, and the output signal of the load cell is converted into a load amount and digitally displayed on a display. It is something.

A second aspect of the present invention provides a fixed first bearing that supports the lower half of the Bethel pin and has an elongated hole in the vertical direction that allows upward movement of the Bethel pin, in place of the bearing of the first invention. and has an elongated hole of approximately the same shape as the elongated hole of the first bearing, and is provided so as to be rotatable coaxially with respect to the first bearing with a rotation cylinder, and does not rotate when measuring the amount of cargo load. The first
The oblong hole of the bearing and the oblong hole of approximately the same shape are aligned to allow upward movement of the Bethel pin, and at other times the Bethel pin is rotated in the opposite direction to approximately the upper half of the Bethel pin. and a second bearing that supports the section.

[Effect]

With this configuration, the Bessel pin can be moved upward when measuring the load amount,
Vessels are supported by a plurality of supporting cylinders, and an output signal from a load cell provided in each supporting cylinder is converted into a load amount and digitally displayed. Also, fix the Bethel pin when driving, unloading, etc.

[Embodiment] Hereinafter, an embodiment of the first invention in which the invention is applied to a dump truck used for transporting slag and the like within a steelworks premises will be described with reference to FIGS. 1 to 8.

In FIGS. 1 to 6, the dump truck 2
At the rear and lower part of the driver's cab 20a,
4 and 24 are arranged to extend rearward in parallel, and bearings 25 and
25 are coaxially provided, and the Bessel pin 23 is rotatably supported by the bearings 25, 25.

A vessel 21 for loading slag etc. is placed on the vessel frames 24, 24, and the vessel 21 has a vessel pin 23 whose outer end is inserted through a pair of vessel legs 22 provided downward from both rear sides of the vessel 21. It is rotatably supported. A board 27 is provided on the upper surface of the Bethesel frames 24, 24 to evenly distribute the load of the Bethesel 21 over each Bethesel frame 24 and to serve as a cushioning material.
A dump cylinder (not shown) for dumping cargo is provided on the lower surface of the vessel 21 to push up the front part of the vessel so as to unload the cargo from the rear of the vessel 21. It is operated to rotate the vessel 21 about the vessel pin 23 as a fulcrum.

At a position in front of the bearing 25 of each vessel frame 24, there are provided two supporting cylinders 28 that carry and measure the vessel 21 when measuring the loaded weight of the vessel 21.

The bearing 25 includes a fixed lower bearing 29 that supports the lower half of the Vessel pin 23, and is provided on the lower bearing 29 so as to be movable in the vertical direction using a hydraulic jack 31, and is moved upward when measuring the load amount. and an upper bearing 30 that allows the Bethel pin 23 to move upward, and moves downward to support the upper half of the Bethel pin 23 at other times.

The lower bearing 29 has a semicircular groove bearing portion 29a formed in the U-shaped inner bottom with an open top, and
Sliding guides 29b are formed on both upper sides of the inner bottom to connect the vessel frame 24 and the vessel frame 24.
The chassis frame 26 is fixed to the chassis frame 26 disposed at the bottom of the chassis frame 26. The upper bearing 30 has a semicircular groove shaft holding part 30a formed on the lower surface, a circular recess 30b on the upper surface, and the sliding guide 29b.
The lower bearing 2 can be moved vertically by being guided by the
It is inserted into 9. At the inner upper part of the lower bearing 29, the hydraulic jack 31 connects the tip of the plunger 31a, which moves in and out from the lower part, to the upper bearing 3.
Connecting pin 30 protruding from the center of the bottom of the recess 30b of 0
c, and the upper part is screwed into the mounting plate 32 so that the mounting height can be adjusted, and is mounted to the upper end of the lower bearing 29 via the mounting plate 32 with bolts 33.

The semicircular groove bearing portion 29a of the lower bearing 29 of the bearing 25 and the semicircular groove shaft holding portion 30a of the upper bearing 30
The Vessel pin 23 is rotatably inserted into the circular hole formed by the Vessel pin 23, and the Vessel legs 23, 23 are rotated through bearings or metal (not shown) at both ends extending from the circular hole. It is movably installed.

In this way, when traveling or dumping, the plunger 31a of the hydraulic jack 31 is hydraulically extended and the Bessel pin 23 is held down by the shaft holding part 30a to restrict the upward movement of the Bessel pin 23, and the Bessel pin 23 is restricted from moving upward. When weighing, the plunger 31a is retracted by the action of a return spring 31b (see FIG. 7) contracted in the cylinder, and the upper bearing 30 connected to the tip of the plunger 31a is raised. The shaft holding part 30a is separated from the surface of the Bessel pin 23 and moved to a position where it does not come into contact with the Bessel pin 23 which moves upward as the Bessel pin 21 moves upward during weighing.

Note that 34 is a connecting bolt that connects the plunger 31a and the connecting pin 30c, 35 is a tool insertion hole for fastening the connecting bolt 34, and 36 is a connector that connects a hose that supplies pressure oil to the hydraulic jack 31. .

On the other hand, the supporting cylinder 28 is equipped with a hydraulic jack 37 for moving the plunger 37a in and out from its upper part.
and a load cell 39 fastened with a bolt 38 to a pressure plate 37b screwed onto the upper end of a plunger 37a of the hydraulic jack 37, and this supporting cylinder 28 is attached to the vessel frame 24 by welding or the like. The cylinder is housed in a bottomed cylindrical casing 40 connected to the vessel frame 24 on the same line and disposed on the chassis frame 26 so that the cylinder axis is perpendicular.

In this way, when weighing the Betussel load,
The load cell 39 pushed up by the plunger 37a extending from the upper end of the hydraulic jack 37 moves upward and extends from the upper opening of the casing 40, and the pressure sensitive part 39 of the load cell 39 is placed on the lower surface of the vessel 21.
When driving or dumping, the plunger 37a is retracted so that the load cell 39 is sufficiently spaced from the lower surface of the vessel 21, and the load cell 39 and hydraulic jack 3
7 is not affected by vibration or shock.

In addition, 41 is a long hole 40 opened in the casing 40.
A hydraulic jack 37 is provided extending outward from a.
connector for connecting the hose that supplies pressure oil to the
2 is a lead wire outlet of the load cell 39, and 43 is a push bolt for fixing the hydraulic jack 37 housed in the casing 40.

Next, the hydraulic piping system of the above-mentioned hydraulic equipment and the wiring system of the measuring device will be explained.

FIG. 7 shows the hydraulic piping system, and the hydraulic unit 44 includes a hydraulic pump 45 and a hydraulic pump 45.
The piping connected to the suction side of the hydraulic pump 45 is connected to an oil tank 47, and the piping connected to the discharge side is branched into two, with one piping connected to four supporting cylinders. 28, and the other piping is connected to a solenoid valve 48 for operating the vessel support, which controls the supply and discharge of pressure oil to each hydraulic jack 37 of bearings 25, 25, and the other piping is connected to a valve 48 for supplying and discharging pressure oil to each hydraulic jack 31, 31 of bearings 25, 25. The vessels are connected to a solenoid valve 49 for releasing the vessel pin presser which controls the vessels, and piping each having a check valve 50 interposed therein is connected from the solenoid valve 48 for vessel holding operation to four hydraulic jacks 37. Bearings 25, 25 are connected to the solenoid valve 49 for releasing the Bethel pin.
Pipes each having a check valve 51 are connected to each of the hydraulic jacks 31, 31. Further, return piping for returning pressure fluid is connected from each of the check valves 50, 51 to the oil tank 47 via both the electromagnetic valves 48, 49.

FIG. 8 is a wiring diagram of the measuring device, in which the lead wires from the load cells 39 disposed on each of the four carrying cylinders 28 connect to the load cell amplifier 52 and the A/D.
Microcomputer 5 via converter 53
The output signal of the load cell 39 is amplified, converted into a digital signal, and input to the microcomputer 54.

This microcomputer 54 includes an arithmetic circuit,
It has a comparison circuit, etc., and calculates the live load by subtracting the own weight of the Bethel 21 stored in advance.
A comparison is made with a preset scheduled loading weight.

The microcomputer 54 is wired via an interface 55 to an operating unit 56 of the driver's cab 20a, and to a hydraulic control device 58 via an interface 57. These include a display 59 for digitally displaying the load calculated by the microcomputer 54, a storage device 60 for inputting and storing the set value of the scheduled loading weight and the own weight of the vessel 21, and a hydraulic pump 45.
An operating device 61 is provided for driving and stopping the motor 46 and operating the vessel holding operation solenoid valve 48 and the vessel pin holding release solenoid valve 49.

Next, the operation of the dump truck load measuring device configured as described above will be explained.

The load amount measurement work is carried out by the driver or the driver's assistant at the driver's cab 20a when the dump truck 20 finishes loading the vessel 21 with slag, etc.
It will be held in

By operating the operating device 61 of the operating unit 56 disposed on the driver's cab 20a, first, the hydraulic pump 45 is driven, and the solenoid valve 49 for releasing the bessel pin presser is switched to the pressure oil discharge position, and the bearing 2
By reducing the hydraulic pressure of the hydraulic jacks 31 and 31 of 5, each plunger 31 is moved by the elastic force of the return spring.
a is retracted, and the shaft holding part 30a of the upper bearing 30, which has been restricting the upward movement of the Bethel pin 23, is raised and separated from the Bethel pin 23, thereby forming a sufficient space above the Bethel pin 23.

When the Bethel pin 23 is free to move upward, the entire load of the Bethel pin 21 is supported only by the board 27 on the Bethel frame 24. At this time, the dump cylinder (not shown) disposed on the lower surface side of the vessel 21 is in a free position at the lowest point of the vessel, so it does not affect the vessel load.

Next, the operating device 61 switches the vessel support operation solenoid valve 48 to the pressure oil supply position, and pressurized oil is supplied to each hydraulic jack 37 of the four support cylinders 28 to extend each plunger 37a upward. .

When the plunger 37a of each hydraulic jack 37 extends, the load cell 39 provided at the upper end of each plunger also rises, and the pressure sensitive part 39a of each load cell 39
comes into contact with the lower surface of Bethel 21 at a total of four locations on both front and rear sides.

When each of the plungers 37a further extends, the load of the Betsu cell 21 supported by the board 27 is gradually borne by the pressure sensitive part 39a of the load cell 39, and the output of each load cell 39 is accordingly increased. The output signals are summed and displayed on display 59.
This measured value increases in proportion to the increase in the load on the load cell 39, and is displayed on the display 59 when the load cell 21 is completely supported by the load cells 39 arranged at four locations. There are no changes in the measured values and they become one.

When the measured value becomes constant, the supply of pressure oil to each hydraulic jack 37 is stopped, and calculation operations such as subtracting the dead weight of the vessel 21, which has been input in advance into the storage device 60, from the measured value are performed, and only the load is calculated. The weight is displayed on the display 59.

In addition, if the maximum loading weight etc. is inputted into the storage device 60 in advance, overloading can be detected by the user.
It is also possible to give a warning with a lamp or the like, or to display an overload amount, an increaseable amount, etc.

When the measurement of the loaded weight is completed, the operating device 61 of the driver's cab 20a is used to switch the solenoid valve 48 for vessel carrying operation to a position that discharges pressure oil from the hydraulic jacks 37 of each carrying cylinder 28, and The plunger 37a is retracted to lower the load cell 39 of each plunger 37a, and the load cell is sufficiently spaced from the lower surface of the vessel 21 to a position where it is not affected by vibrations and shocks during driving, and then the electromagnetic device for releasing the vessel pin presser The valve 49 is switched to the position where pressure oil is supplied to each hydraulic jack 31 of both bearings 25, and each hydraulic jack 31
The plunger 31a is extended to lower the upper bearing 30, and the shaft presser portion 30a on the lower surface of the upper bearing 30 is fixed at a position that restricts the upward movement of the Bethel pin 23, during loading work other than when measuring the loaded weight. Bethel pin 23 when driving and dumping
The upward movement of is restricted.

In this embodiment, hydraulic jacks 31 and 37 are used for each supporting cylinder 28 and bearing 25, but an air cylinder or an electric screw cylinder or the like may be used instead of the hydraulic cylinder.
Further, it is preferable that the number of supporting cylinders 28 is two or more.

9 and 10 show a Bethel pin support part according to an embodiment of the second invention, in which a Bethel pin 70 having a circular cross section has both ends 70a formed with a larger diameter than the central part, and the end parts 70a. bethcel frame 7
Both tip portions 70b are attached via bearings 72 on both rear sides of 1.
is prominently supported.

The bearing 72 includes a first bearing 73 that is fitted into and fixed to the vessel frame 71;
from the inside of the vessel frame 71 (right side in FIG. 9) into the ring portion 73a of the first bearing 73,
It is composed of a first bearing 73 and a second bearing 74 rotatably disposed on the same axis. The first bearing 73 supports the lower half of the Bethel pin 70 and has an elongated hole 73b in the vertical direction that allows the Bethel pin 70 to move upward. The second bearing 74 includes an extending portion 74a and an extending portion 74a.
A rotating bracket 76 provided on the outer periphery of the rotary bracket 76 and an elongated hole 74b having approximately the same shape as the elongated hole 73b of the first bearing 73.
The end face of the extended portion 74a is in contact with a bracket 75 protruding from the vessel frame 71 to be prevented from coming off.

The second bearing 74 normally has an oblong hole 74b.
However, as shown by the two-dot chain line in FIG.
3b and is arranged with a phase shift.

Furthermore, the tip 70 of the end 70a of the Bethel pin 70 passing through the first bearing 73 and the second bearing 74
b protrudes to the outside of the Bethel frame 71 (on the left side in FIG. 9) and is inserted into the Bethel legs 77 provided on both rear sides of the Bethel (not shown). Rotates around 70 as a fulcrum.

On the other hand, above the second bearing 74, a cylinder 78 which rotationally drives the second bearing 74 by hydraulic pressure or pneumatic pressure has its base end 78a pivotally supported on the front side of the vessel frame 71. The tip of the piston rod 79 is pivotally supported and connected to a rotating lever 81 fixed to a bar 80 implanted in the rotating bracket 76 of the second bearing 74.
8 is arranged so as to be swingable when activated.

By operating this cylinder 78 with hydraulic pressure or the like, the second bearing 74 is rotated within a range of 90 degrees, and the piston rod 79 is actuated in the extension direction, so that the second bearing 74 is rotated as shown in FIG. It rotates clockwise, and when the clockwise rotation limit is reached, the second
The longitudinal direction of the oblong hole 74b of the bearing 74 is in the vertical position as shown by the solid line in FIG.
b and the oblong hole 73b of the first bearing 73 match in phase, allowing the Bethel pin 70 to move upward.

Further, when the piston rod 79 operates in the shortening direction and the second bearing 74 rotates counterclockwise in FIG.
The longitudinal direction of the oblong hole 74b of the bearing 74 is oriented in the horizontal direction as shown by the two-dot chain line in FIG. restrict movement to.

Therefore, in this embodiment in which the bearing 72 is configured as described above, the cylinder 7 is
By operating the second bearing 74 and positioning it at the rotation limit in the counterclockwise direction in FIG. 10, the Bessel pin 70 is supported while restricting its upward movement. to rotate the second bearing 74, and rotate the second bearing 74 to the first position.
By positioning it at the limit of rotation in the clockwise direction in Figure 0, the Bessel pin 70 can be moved upward, and the Bessel load can be measured in the same manner as in the previous embodiment.

Note that 82 is a rotation stopper that restricts the rotation of the Bessel pin 70, 83 is a grease inlet, and 84 is a Bessel pin removal prevention lid provided at the Bessel pin 70 insertion portion of the Bessel leg 77.

〔Effect of the invention〕

As explained above, the dump truck load measuring device according to the present invention includes a bearing that supports the Bethel pin disposed on the Bethel frame, a fixed lower bearing that supports the lower half of the Bethel pin, and a fixed lower bearing that supports the lower half of the Bethel pin.
It is installed in the lower bearing so that it can be moved vertically with a jack, and when measuring the load capacity, it moves upward to allow the Bethel pin to move upward, and at other times it moves downward to move the upper half of the Bethel pin. or a fixed first bearing that supports the lower half of the Bethel pin and has an oblong hole in the vertical direction that allows the Bethel pin to move upward; It has an oblong hole with approximately the same shape as the oblong hole, and is provided so that it can rotate coaxially with respect to the first bearing with a rotation cylinder, and when measuring the load amount, it rotates and connects to the oblong hole of the first bearing. A second bearing that aligns the substantially same-shaped oblong hole to allow upward movement of the Bethel pin, and otherwise rotates in the opposite direction to support approximately the upper half of the Bethel pin. At the same time, a load cell that converts pressure into an electric signal is installed on the carrier cylinder that supports the vessel, and the output signal of the load cell is converted into a load amount and displayed digitally on a display installed in the driver's cab, etc. During loading, transporting cargo, dumping, etc., the vehicle is operated in the same way as a normal dump truck with the vehicle's pin fixed, and only when weighing is carried out between the vehicle and vehicle's pin in order to lift the vehicle above the vehicle's frame. The Vessel is supported by the Vessel pin without being affected by the vibrations and shocks caused by the load, and the Vessel pin is not interfered with when measuring the load, allowing the Vessel to be carried smoothly, and the work of measuring the loaded weight can be moved to the location where the truck scale is installed. When the loading work is finished, the driving vehicle can carry out the work from the driver's cab at the same place, and it is also possible to measure only the loaded Betsu cell load.
The load cell can be left unloaded except during weighing, and the design tolerance required for the load cell's vibration and shock resistance can be reduced, making it possible to use a high-precision load cell with high resolution, allowing for highly accurate weighing. It has effects such as being able to achieve this.

Furthermore, since the structure is simple, failures are less likely to occur, and the cost is low.

[Brief explanation of the drawing]

1 to 8 show one embodiment of the present invention, in which FIG. 1 is a cross-sectional view of the main part showing the support part of the Bethel pin, FIG. 2 is a cross-sectional view of FIG.
The figure is a side view of the main part of the part where the carrying cylinder is installed, FIG. 4 is a sectional view taken from the side shown in FIG. 3, FIG. 7 is a piping diagram showing the hydraulic piping system, FIG. 8 is a wiring diagram of the measuring device, and FIGS. 9 and 10 show other embodiments of the present invention.
Figure 9 is a cross-sectional view of the main part showing the support part of the Vessel pin, Figure 10 is a cross-sectional view taken along the line XX in Figure 9, and Figures 11 to 13 are the conventional weighing method and the installation of the Vessel in a conventional dump truck. FIG. 11 is an explanatory diagram showing a weighing method using a track scale, FIG. 12 is a side view showing the mounting structure of the vessel, and FIG. 13 is a rear view. 20...Dump truck, 21...Bethcell,
22,77...Bethuseru leg, 23,70...Bethuseru pin, 24,71...Bethuseru frame, 2
5...Bearing, 26...Chassis frame, 28...
...Carrying cylinder, 29...Lower bearing, 29a...
Bearing part, 30... Upper bearing, 30a... Shaft holding part, 31... Hydraulic jack, 31a... Plunger, 37... Hydraulic jack, 37a... Plunger, 39... Load cell, 39a... Pressure sensitive part, 4
0...Casing, 44...Hydraulic unit, 45
... Hydraulic pump, 48 ... Solenoid valve for Betsuel holding operation, 49 ... Solenoid valve for releasing Betsuel pin presser,
50, 51...Check valve, 52...Load cell amplifier, 53...A/D converter, 54
... Microcomputer, 56 ... Operation unit, 58 ... Hydraulic control device, 59 ... Display device, 6
0... Storage device, 61... Operating device, 72... Bearing, 73... First bearing, 73b... Oblong hole, 74
...Second bearing, 74b...Oval hole, 76...Rotation bracket, 78...Cylinder, 79...Piston rod.

Claims (1)

[Scope of Claims] 1. The rear lower end of the vessel is pivotally supported by a vessel pin disposed at the rear of a vessel frame on which the vessel is placed, and the vessel is rotated about the vessel pin as a fulcrum by a dump cylinder during dump operation. Further, in the dump truck cargo load measurement device, the vessel frame is provided with a plurality of supporting cylinders for supporting the vessel during cargo load measurement, and a display device for displaying the cargo load is disposed in a driver's cab or the like. A bearing that supports the Bethel pin is disposed on the Bethel frame, and the bearing includes a fixed lower bearing that supports the lower half of the Bethel pin, and a lower bearing that is movable in the vertical direction with a jack. , an upper bearing that moves upward to allow the Bethel pin to move upward when measuring the load amount, and moves downward to support the upper half of the Bethel pin at other times; A load measuring device for a dump truck, characterized in that a load cell for converting pressure into an electrical signal is provided, and the output signal of the load cell is converted into a load amount and digitally displayed on the display. 2 The lower end of the rear of the Bethel is pivotally supported by a Bethel pin disposed at the rear of the Bethel frame on which the Bethel is placed, and the dump cylinder rotates the Bethel around the Bethel pin as a fulcrum during dump operation, and the Bethel frame is rotated. , in a dump truck cargo load measuring device, which is provided with a plurality of carrying cylinders for supporting the vessel when measuring the cargo load, and a display device for displaying the cargo load is disposed in a driver's cab, etc., wherein the vessel pin is mounted on the vessel frame; a fixed first bearing that supports the lower half of the Bethel pin and has an elongated hole in the vertical direction that allows upward movement of the Bethel pin; It has an elongated hole of approximately the same shape as the elongated hole of the first bearing, and is provided so as to be rotatable coaxially with respect to the first bearing with a rotation cylinder, and rotates when measuring the amount of cargo load. The oblong hole of the first bearing is aligned with the oblong hole of the substantially same shape to allow the Bethel pin to move upward, and at other times, it is rotated in the opposite direction to the above-mentioned direction and is moved substantially above the Bethel pin. and a second bearing supporting the half part, the supporting cylinder is provided with a load cell that converts pressure into an electric signal, and the output signal of the load cell is converted into a load amount and digitally displayed on the display. Dump truck load measuring device.