JP4095482B2 - Garbage truck weighing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for measuring a load weight of dust in a garbage truck.
[0002]
[Prior art]
In a garbage truck equipped with a loaded dust weighing device, the dust storage box is received by compression load cells vertically arranged at multiple locations on the front, rear, left and right of the vehicle body, and the load weight of the dust is measured based on the output. (For example, refer to Patent Document 1). The refuse storage box is substantially fixed by the movement restricting device so as not to move back and forth and from side to side with respect to the vehicle body. However, if it is fixed in the vertical direction, the weight cannot be measured. Therefore, although it is not fixed, a device that prevents this from happening when the dust storage box jumps greatly during traveling is installed, or it is secured during traveling and unlocked during weight measurement to load the load cell. Is configured to receive. A cylinder is used as a device for performing the lashing.
FIG. 7 is a side view including a partial cross section showing a structure generally used for weight measurement by the compression load cell as described above. The X direction in the figure is the vehicle body length direction, the Y direction is the vehicle width direction, and the Z direction is the height direction.
[0003]
In the figure, a pin 103 is vertically attached to the lower surface of the bottom plate 102 of the dust container 101. On the other hand, a load cell 106 is attached to the mounting plate 105 on the vehicle body 104 side. The load cell 106 detects a load and outputs an electrical signal when the pin 103 is pressed vertically against the bottom 106a of a hole provided on the left end side. Further, a stopper 108 is fixed to the support plate 107 welded to the lower surface of the bottom plate 102 so that the pin 103 does not shift in the X direction by contacting the left end surface 106b of the load cell 106. It is configured. Further, the support plate 107 and the stopper 108 are also formed at a position rotated 90 degrees around the axis of the pin 103 from the position shown in the drawing, so that no positional deviation in the Y direction occurs. The load including dust in the dust container 101 is received by the bottom portion 106a of the load cell 106 via the pin 103 and is measured.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 6-49524 (pages 2 to 3, FIGS. 3, 4, 5, and 7)
[0005]
[Problems to be solved by the invention]
In the conventional garbage truck weighing device as described above, the structure is complicated by the amount required for the device and the securing device that prevent the dust container box from jumping greatly, resulting in an increase in manufacturing cost. In addition to allowing small splashes, the dust storage box slightly vibrates up and down relatively with respect to the vehicle body even when the dust storage box is secured to the vehicle body during traveling, due to a slight movement of the cylinder or the like. It is inevitable. In that case, the pin 103 hits the bottom portion 106a of the load cell 106 and continues to give an impact load, so that the life of the load cell 106 is shortened and noise due to the hitting is also generated.
[0006]
In view of the above-described conventional problems, an object of the present invention is to provide a dust truck weighing device that has a simple structure and prevents an impact load from being generated due to vertical vibration of a dust container during traveling. And
[0007]
[Means for Solving the Problems]
The measuring device for a garbage truck according to the present invention is a beam that is supported in a cantilevered state with the axial direction sideways on the front side of the garbage truck and that outputs a load signal by supporting the load of the dust container on the free end side. type and front load cell, said supported in a cantilever state by the axial sideways in the vehicle body rear side of the refuse vehicle, the beam type for outputting the applied load signal by supporting the load of the dust container box with self Yoshitan side Each of the front load cell and the rear load cell, and a spherical bearing mounted around an axis of a connection portion of the front load cell and the rear load cell at the free end of each of the front load cell and the rear load cell. It is in a relation that the other load cell regulates the movement of the dust container in the axial direction of one load cell by being arranged in a crossing manner. It is intended to.
[0008]
In the garbage truck weighing device configured as described above, the dust container is restricted from moving in the radial direction with respect to the central axis of each load cell by the connection via the spherical bearing. On the other hand, with a single load cell, it is not possible to guarantee the restriction of movement of the dust container in the axial direction. However, since the front load cell and the rear load cell cross each other in the axial direction, the movement of the dust container box in the axial direction of the front load cell is restricted by the rear load cell, and the dust load is accommodated in the axial direction of the rear load cell. The movement of the box is regulated by the front load cell. Therefore, the refuse storage box is restricted in movement in the three-dimensional directions of up and down, left and right, and front and rear, and is substantially fixed to the vehicle body. In this way, the dust storage box can be substantially fixed to the vehicle body and measured by a simple structure in which the axial directions of the load cells provided laterally at the front and rear sides of the vehicle body are crossed. . In addition, the dust storage box does not jump up while traveling, and there is no part that generates an impact load even if it jumps slightly, so that the impact load is generated due to the vibration of the dust storage box during traveling. It can be completely prevented. Therefore, the durability of the load cell is not impaired and no noise is generated.
[0009]
In the weighing device, a total of at least four front load cells and rear load cells may be provided on the front, rear, left, and right of the vehicle body, and at least two of the load cells may cross each other in the axial direction.
In this case, if each load cell is arranged corresponding to the bottom shape of the dust container box, the dust container box can be firmly fixed in a well-balanced manner and the weight can be accurately measured. Various variations are possible for the arrangement of each load cell.
[0010]
Further, in the weighing device, a total of at least four front load cells and rear load cells may be provided on the front, rear, left and right of the vehicle body, and the axial directions may be orthogonal between a pair of front and rear or left and right load cells.
In this case, if each load cell is arranged corresponding to the bottom shape of the dust container box, the dust container box can be firmly fixed in a well-balanced manner and the weight can be accurately measured. Moreover, since each load cell is orthogonally arranged, manufacture is easy.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a left side view of a garbage truck 1 equipped with a weighing device according to an embodiment of the present invention. In the figure, a dust container 3 is attached on a vehicle body (chassis) 2, and a packer 4 is attached to the rear part of the dust container 3. An insertion port 4a is provided at the rear of the packer 4, and the dust thrown in from there is a dust storage box by a cooperative operation of a rotating plate 41 that rotates clockwise and a pushing plate 42 that reciprocally rotates. 3 is pushed into. In the garbage truck 1, every time dust is thrown into the dump, the total weight of the thrown dust is measured by a weighing device described later and displayed on the driver's seat. As a result, it is possible to measure the weight of the dust that is charged for the dust treatment and charge it accordingly. It is also possible to check the total load weight. When the dust container 3 is full, the packer 4 is rotated upward and opened, and then the push plate 31 provided in the dust container 3 is moved backward to discharge the dust. it can.
[0012]
FIG. 2A is an enlarged left side view of the vehicle body 2 and the main girder 5 at the bottom of the dust container 3. The dust container 3 is fixed on the main girder 5. Moreover, (b) is a BB line sectional view in (a). Here, as shown to (a), let the length direction of the vehicle body 2 be an X direction, a vehicle width direction be a Y direction, and let a height direction be a Z direction. The right side view is almost symmetrical with this. 3A is a cross-sectional view taken along the line IIIA-IIIA in FIG. 2A, and FIG. 3B is a view taken in the direction of the arrow IIIB in FIG.
[0013]
2A (see also FIG. 3A), a pair of beam-type load cells 6 (hereinafter referred to as front load cells 6) are located in the vicinity of the left and right ends of the vehicle body 2 in the vehicle width direction. .) Are fixed by bolts 7 with the axial direction set to the horizontal direction (X direction). The main girder 5 is connected to the free end side (X direction side) of the front load cell 6 via a spherical bearing (detailed later). On the other hand, in FIGS. 2A and 3B, a pair of beam-type load cells 6 (hereinafter referred to as the rear load cells 6) are arranged laterally (Y direction) on the left and right sides of the rear side of the vehicle body 2. ) And is fixed by bolts 7. The main girder 5 is connected to the free end side (the vehicle width direction outer side) of the rear load cell 6 via a spherical bearing (detailed later).
[0014]
In FIG. 2A, rods 10 are respectively attached between a bracket 8 fixed to the vehicle body 2 and a pair of brackets 9 fixed to the main girder 5, whereby the main girder 5 is The movement of the vehicle body 2 is restricted in the X direction. 2B, rods 13 are respectively attached between a bracket 11 fixed to the vehicle body 2 and a pair of brackets 12 (only one is shown) fixed to the main girder 5. Thereby, the main girder 5 is restricted in movement in the Y direction with respect to the vehicle body 2. Each member for such movement restriction is provided just in case, and is essentially unnecessary in this embodiment, and can be omitted.
[0015]
Next, the structure of the connection location between each load cell 6 and the main beam 5 will be described in detail. FIG. 4 is a cross-sectional view showing the connection location. The illustrated load cell is, for example, the front load cell 6, and the central axis A is parallel to the X direction in FIG. The front load cell 6 is screwed to the vehicle body 2 with bolts 7 via a base portion 2a having a predetermined height. As a result, the load cell 6 is supported in a cantilever state (cantilever state), and a slight bending deformation occurs due to a load acting in the radial direction on the free end side, and an applied load signal (signal corresponding to the load) is electrically generated. The signal is output from the cable 6a as a signal. This electrical signal is input to an arithmetic device (not shown) together with electrical signals from other load cells, and the dust weight as a result of the computation is displayed in the cab.
[0016]
A spherical bearing 14 is mounted on the small diameter portion 6b (hereinafter referred to as the free end 6b) on the free end side, and the inner ring member 14a is in spherical contact with the outer ring member 14b. On the other hand, a support member 16 in which a flange portion 16 a and a support portion 16 b having a round hole are integrally formed is screwed to a bracket 15 fixed to the lower surface of the main girder 5 by a bolt 17. The spherical bearing 14 fitted in the support portion 16 b is prevented from coming off in the axial direction by a pair of retaining rings 18. Further, the retaining end 19 prevents the free end 6 b inserted through the inner ring member 14 a of the spherical bearing 14. However, these retainers 18 and 19 do not guarantee the movement restriction when the support member 16 is about to move to the right in the X direction with respect to the front load cell 6.
[0017]
The front load cell 6 and the support member 16 connected through the spherical bearing 14 as described above are spherical bearings against bending deformation in a minute radial direction (mainly up and down) on the free end side of the front load cell 6. The support member 16 can follow smoothly through 14. As a result, the load always acts vertically downward with respect to the center of curvature of the spherical surface on the central axis A.
[0018]
Further, when considering the forward load cell 6 as a rigid body ignoring such a small bending deformation, the forward load cell 6 and the support member 16 are connected to each other through the spherical bearing 14 without substantial gaps. As a result, the support member 16 is restricted from moving in the radial direction of the central axis A, that is, in the direction parallel to the YZ plane with respect to the front load cell 6. Therefore, the main girder 5, that is, the dust container box 5, is restricted from moving relative to the vehicle body 2 in a direction parallel to the YZ plane. In short, this means that the refuse storage box 5 cannot move vertically and horizontally. However, as mentioned above, it cannot be guaranteed that it will not move back and forth.
[0019]
On the other hand, the structure of the connection portion between the rear load cell 6 and the main beam 5 is the same, and only the X and Y directions in FIG. 4 are different. FIG. 5 is a plan view showing the positional relationship on the vehicle body 2 between the front load cell 6 (left) and the rear load cell 6 (right). In the figure, both the pair of front load cells 6 have an axial direction parallel to the X direction, and are disposed near the left and right ends of the vehicle body 2 in the vehicle width direction (Y direction). The pair of rear load cells 6 are both disposed in the vicinity of the rear end of the vehicle body 2 with the axial direction parallel to the Y direction and opposite to each other. When the front load cell 6 and the rear load cell 6 are arranged in such a manner that their axial directions intersect with each other (in this case, orthogonal), the front load cell 6 is in a direction parallel to the YZ plane (two dimensions, up and down, left and right). The rear load cell 6 restricts the movement of the dust container 3 in the direction parallel to the XZ plane (two dimensions before and after the top and bottom). Accordingly, the dust container 3 is restricted in movement in the three-dimensional directions of up and down, left and right, and front and rear, and is substantially fixed to the vehicle body 2.
[0020]
In this way, the dust storage box 3 is substantially fixed to the vehicle body 2 and measured by a simple structure in which the axial directions of the load cells 6 provided laterally in front and rear of the vehicle body 2 are crossed. can do. In addition, the dust storage box 3 does not jump up during traveling, and there is no portion where an impact load is generated even if the dust storage box 3 jumps up slightly, so that an impact load is generated due to vibration of the dust storage box 3 during traveling. This can be completely prevented. Therefore, the durability of each load cell 6 is not impaired and no noise is generated.
Further, in FIG. 5, the free ends 6 b of the load cells 6, that is, the connection places with the dust container 3 are present at positions (substantially four corners) corresponding to the bottom shape of the dust container 3. Thereby, the refuse storage box 3 can be firmly fixed in a well-balanced manner and the weight can be accurately measured.
[0021]
In the above embodiment, as shown in FIG. 5, the front load cell 6 is parallel to the X direction and the rear load cell 6 is parallel to the Y direction. However, this arrangement may be reversed.
Further, although the axial directions of the front and rear load cells 6 are orthogonal to each other, they do not necessarily have to be orthogonal, as long as they intersect at an angle as close to 90 degrees as possible. However, the orthogonal arrangement is easy to manufacture.
The “intersection” may be a three-dimensional intersection or an intersection on the same plane.
Further, the axial direction of the load cell 6 is preferably horizontal, but the use of the spherical bearing 14 does not require strictly horizontal. That is, it can be slightly inclined as required.
[0022]
FIG. 6 is a diagram showing a variation of the arrangement of the load cells 6. (A) is the example which has arrange | positioned the front load cell 6 and the back load cell 6 by making the axial direction cross | intersect on each side. (B) is an example in which the axial directions of the starboard front load cell 6 and the rear load cell 6 are aligned, and the axial direction of each port load cell 6 intersects the starboard load cell 6. Of course, this may be reversed. Further, (c) shows an example in which the axial directions are crossed at least between the front, rear, left and right load cells 6 arranged obliquely. Various other arrangement variations are possible. Further, the number of load cells 6 is not limited to four and may be more than that, or conversely, two or three may be basically used. However, for accurate weighing, it is preferable to provide four or more load cells on the front, rear, left and right of the vehicle body 2.
[0023]
【The invention's effect】
According to the dust truck weighing device of the present invention configured as described above, the dust storage box is restricted in movement in the radial direction with respect to the central axis of each load cell by connection via the spherical bearing, The movement of the dust container box in the axial direction of the front load cell is regulated by the rear load cell, and the movement of the dust container box in the axial direction of the rear load cell is regulated by the front load cell. Therefore, the refuse storage box is restricted in movement in the three-dimensional directions of up and down, left and right, and front and rear, and is substantially fixed to the vehicle body. In this way, the dust storage box can be substantially fixed to the vehicle body and measured by a simple structure in which the axial directions of the load cells provided laterally at the front and rear sides of the vehicle body are crossed. . In addition, the dust storage box does not jump up while traveling, and there is no part that generates an impact load even if it jumps slightly, so that the impact load is generated due to the vibration of the dust storage box during traveling. It can be completely prevented. Therefore, the durability of the load cell is not impaired and no noise is generated.
[Brief description of the drawings]
FIG. 1 is a left side view of a garbage truck equipped with a weighing device according to an embodiment of the present invention.
FIG. 2A is a left side view showing an enlarged view of the vehicle body of the garbage truck shown in FIG. 1 and the main girder of the lower part of the dust container box. (B) is the BB sectional view taken on the line in (a).
3A is a cross-sectional view taken along the line IIIA-IIIA in FIG. 2A, and FIG. 3B is a view taken in the direction of the arrow IIIB in FIG.
FIG. 4 is a cross-sectional view showing a structure of a connection portion between a load cell and a main beam.
FIG. 5 is a plan view showing a positional relationship between a front load cell (left) and a rear load cell (right) on a vehicle body.
FIG. 6 is a diagram showing a variation of the arrangement of the load cells, different from FIG.
FIG. 7 is a side view including a partial cross section showing the structure of weight measurement in a conventional garbage truck weighing device.
[Explanation of symbols]
1 Garbage Car 2 Car Body 3 Garbage Storage Box 6 Load Cell (Front Load Cell, Rear Load Cell)
6b Small diameter part (free end)
14 Spherical bearing

Claims (3)

A beam-type front load cell that is supported in a cantilevered state with the axial direction sideways on the vehicle body front side of the garbage truck, and outputs a load signal by supporting the load of the dust container on the free end side,
A rear load cell of the beam type is supported by the axially sideways in a cantilever state, for outputting the applied load signal by supporting the load of the waste accommodating box by the own Yoshitan side in the vehicle body rear side of the refuse vehicle,
A spherical bearing mounted around the axis of the connection point with the dust container on the free end side of each of the front load cell and the rear load cell ;
The front load cell and the rear load cell are disposed so as to cross each other in the axial direction, whereby the other load cell regulates the movement of the dust container in the axial direction of the one load cell. Garbage weighing equipment. 2. The garbage truck weighing device according to claim 1, wherein a total of at least four front load cells and rear load cells are provided on the front, rear, left and right sides of the vehicle body, and at least two of the load cells intersect each other in the axial direction. 2. The garbage truck weighing device according to claim 1, wherein a total of at least four front load cells and rear load cells are provided on the front, rear, left and right sides of the vehicle body, and the axial direction is orthogonal between a pair of front and rear or left and right load cells.

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