JP7053248B2 - Garbage truck - Google Patents

Description

The present invention relates to a garbage truck having an overload detection device for detecting an overload of a dust storage box.

Conventionally, a garbage truck having a chassis having a differential gear and a chassis frame, a dust storage box mounted on the chassis, and an overload detection device for detecting overloading of the dust storage box has been known. (For example, see Patent Document 1). In this dust collection vehicle, the dust storage box is pulled out from the inside to the outside through the frame (body frame) of the dust storage box fixed on the chassis frame, and the vertical position can be adjusted on the outside of the chassis frame. An arm fixed to the outside of the frame by a level adjustment bolt, a transmitter fixed to the inside of the chassis frame of this arm and transmitting a predetermined signal in the left-right direction (vehicle width direction), and an arm chassis. It is fixed at a position inside the frame and fixed on the differential carrier on the axle side and the receiver that receives the signal transmitted by the transmitter, until the relative position between the axle and the chassis frame enters the predetermined set position. A signal cutoff unit that interrupts the signal by intervening on the signal transmission path when the relative position between the axle and the chassis frame enters a predetermined set position, and the signal cutoff unit that passes the signal off the signal transmission path and receives the signal. It is equipped with a notification unit that notifies according to the detection status of the signal by the unit.

With this configuration, when the weight increases due to the dust being contained in the garbage truck, the relative position between the axle and the chassis frame changes, and the relative position between the axle and the chassis frame is the overload of dust. Alternatively, when the vehicle enters a predetermined setting position corresponding to the determination standard of the predetermined set amount, the signal transmitted from the transmission unit provided on the chassis frame side is blocked by the signal cutoff unit provided on the axle side and received. It will not reach the part. As a result, the signal interruption is detected by the receiving unit, and notification is given according to this detection state, so that it is possible to determine whether the dust is overloaded or a predetermined set amount.

Japanese Patent No. 4999655

In the above-mentioned conventional garbage truck, a transmitting unit and a receiving unit are provided on each pair of vertical girders extending in front of and behind the dust storage box, and a signal blocking unit provided on the differential carrier blocks the light from the transmitting unit. It is designed to detect the presence or absence of loading.

However, the height of the signal cutoff part must be changed several times over time due to deterioration of the suspension of the chassis over time, and it is very troublesome to fine-tune the height by turning the wing nut etc. There is a problem.

The present invention has been made in view of this point, and an object of the present invention is to make the overload detection device easy to check and maintain by a simple configuration.

In order to achieve the above object, in the present invention, the dust storage box is provided with a detection unit that directly detects the distance between the detection unit and the differential carrier.

Specifically, in the first invention, a chassis having a chassis frame supported by a suspension including a differential gear and a chassis.
The dust storage box mounted on the above chassis frame and
It is premised on a garbage truck having an overload detection device for detecting the overload of the dust storage box.

And the above-mentioned overload detection device
It is provided below the bottom plate portion of the dust storage box, and is provided with a detection unit that detects the vertical distance between the differential carrier accommodating the differential gear and the detected portion.
It is configured to detect the overload of the dust storage box from the measurement data of the detection unit.

According to the above configuration, the detection unit of the overload detection device provided below the bottom plate portion of the dust storage box directly detects the vertical distance between the detection unit and the detected portion of the differential carrier, so that it is bothered as in the conventional case. It is not necessary to provide a signal blocking unit to block the signal when overloaded and detect the switching. Therefore, it is not necessary to adjust by turning the wing nut or the like for detecting overload, and it is sufficient to change the threshold value of the detection distance itself, and the fine adjustment work is extremely easy. In addition, since no mechanical configuration such as a wing nut is required, the number of parts is reduced, installation work is easy, and maintenance is easy.

In the second invention, in the first invention,
The overload detection device is attached to the bottom of a crossbar extending in the vehicle width direction from the vertical girder at the bottom of the dust storage box so that the detection portion is positioned below the bottom of the crossbar.

According to the above configuration, since the detection unit is positioned below the bottom of the crossbar extending from the vertical girder in the vehicle width direction, it is easy to check the detection unit from the side of the chassis and the adjustment work is easy.

In the third invention, in the second invention,
The overload detection device includes a warning light and a warning buzzer that illuminate when overload is detected.

According to the above configuration, when the dust storage box is overloaded, the overloaded can be easily confirmed visually and the overloaded can be reliably recognized from the alarm sound.

In the fourth invention, in the second or third invention,
The overload detection device is provided with a display unit indicating the vertical distance to the operation unit and the detection unit below the bottom of the crossbar.

According to the above configuration, since the operation unit and the display unit are provided below the crossbar, the display unit is easy to see, and it is easy to operate the operation unit while looking at the display unit.

As described above, according to the present invention, a detection unit for detecting the vertical distance between the detected portion of the differential carrier and the detected portion of the differential carrier is provided below the bottom plate portion of the dust storage box, and the dust is obtained from the measurement data of this detection unit. By being configured to detect the overload of the storage box, the overload detection device can be easily confirmed and maintained by a simple configuration.

It is a side view which shows the overload detection device and its periphery. It is a top view which shows the overload detection device and its periphery. It is a rear view which shows the overload detection device and its periphery. It is an enlarged plan view of the ID part of FIG. 1B. FIG. 1B is an enlarged rear view of the ID portion and a partially exploded view thereof. It is a side view which shows the garbage truck which concerns on embodiment of this invention. It is a rear view which shows the garbage truck which concerns on embodiment of this invention. It is a simplified electric circuit diagram of an overload detection device.

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

-Composition of garbage truck-
2A and 2B show a dust collecting vehicle 1 according to an embodiment of the present invention, in which the dust collecting vehicle 1 has a pair of left and right chassis frames 2b supported by a suspension 2a including a differential gear (not shown). It has a chassis 2 to have. The chassis 2 is equipped with a dust storage box 4 having a dust loading box 3 having a dust loading device (not shown) built in the rear.

Specifically, the chassis frame 2b extending in the front-rear direction is supported via the suspension 2d with respect to the wheels 2c rotatably provided via the differential gear. Here, the suspension 2a includes, for example, a differential gear, a shaft, wheels 2c, and the like, and has a function of absorbing vibration during traveling as well as a traveling function. The differential gear is built in, for example, the differential carrier 5 made of a cast product. As shown in FIGS. 1A to 1C, a detected portion 5a is formed on the upper surface of the differential carrier 5. The detected portion 5a is relatively flat with respect to the surroundings, and its position can be easily detected. A large number of parts such as a muffler 7 are arranged on the chassis 2.

The garbage truck 1 is provided with an overload detection device 10 for detecting the overload of the dust storage box 4. Specifically, the overload detection device 10 is provided below the bottom plate portion of the dust storage box 4, and includes a detection unit 11 that detects the vertical distance L between the differential carrier 5 and the detected portion 5a. .. Although not shown in detail, for example, the detection unit 11 is composed of a laser sensor, and has a light emitting unit and a light receiving unit on the back side of the lens 11a. That is, since the light emitting portion, the light receiving portion, and the like are provided between the pair of chassis frames 2b, as shown in FIG. 1E, for example, a cylinder that further covers the periphery of the lens 11a, the O-ring 11b, the lens cover 11c, and the lens cover 11c. The outer cover 11d and the like are firmly protected from the collision and adhesion of earth and sand that roll up from the road surface while the vehicle is running. As described above, since the chassis frame 2b is supported by the suspension 2a (wheels 2c) via the suspension 2d, the chassis frame 2b gradually sinks as the dust is loaded into the dust storage box 4, and as a result, the detection unit The vertical distance L (shown in FIG. 1A) between 11 and the detected portion 5a is shortened. Therefore, the measurement data of the detection unit 11 is configured to be smaller than a certain threshold value Lmin to detect the overload of the dust storage box 4.

A vehicle body frame is provided at the bottom of the dust storage box 4. This vehicle body frame includes a pair of left and right upper vertical girders 4a attached along the bottom plate of the dust storage box 4, a lower vertical girder 4b connected to the upper vertical girder 4a via a dump hinge (not shown), and a lower vertical girder. It has a crossbar 4c extending in the left-right direction (vehicle width direction) from 4b. A dump cylinder 6 for tilting the dust storage box 4 is attached to the lower vertical girder 4b via a mounting bracket (not shown).
As shown in FIGS. 1A to 1C, the overload detection device 10 is attached to the bottom of the crossbar 4c so that the detection unit 11 is positioned below the bottom. In the present embodiment, the crossbar 4c is a hydraulic oil receiving bracket that prevents hydraulic oil or the like from the hydraulic equipment on the dust storage box 4 side from leaking to the ground, and a sensor mounting bracket 12 is attached to the bottom of the crossbar 4c. It is fixed. The sensor mounting bracket 12 extends horizontally in the vehicle width direction to a side slightly opposite to the detected portion 5a. The detection unit 11 is attached to the tip of the sensor mounting bracket 12. The crossbar 4c and the sensor mounting bracket 12 may be integrated.

As shown in FIG. 3, the overload detection device 10 includes a warning light (PL) 10a and an alarm buzzer (BZ) 10d that illuminate when overload is detected. Further, in the overload detection device 10, a display unit 10c indicating the vertical distance L to the operation unit 10b and the detected unit 5a is provided below the bottom of the crossbar 4c. When dust or the like is thrown into the dust storage box 4 and becomes overloaded, the vertical distance L between the detected unit 5a and the vertical distance L is shortened, and the detection unit 11 detects that the vertical distance L is equal to or less than a predetermined threshold value Lmin. Then, the relay 10f is turned on, the warning light 10a is lit, and the alarm buzzer 10d sounds the alarm. In addition, only one of these warning lights 10a and warning buzzer 10d may be provided. The alarm buzzer 10d may be provided in the driver's cab, for example. As the operation unit 10b, for example, three buttons are arranged side by side, and programming such as setting the threshold value Lmin is possible while looking at the display unit 10c. At this time, if the storage box main body of the dust storage box 4 is dumped together with the upper vertical girder 4a integrated with the storage box main body, a space portion is created between the lower vertical girder 4b and the upper vertical girder 4a, and the operation unit. The operation unit 10b can be easily operated while looking at the 10b and the display unit 10c from above.
The overload switch 13 for turning on / off the power of the overload detection device 10 may be provided on the controller (not shown) in the driver's cab or the controller 3a of the dust input box 3. Only when the overload switch 13 is turned on, the detection unit 11 performs detection.

In this embodiment, as shown in FIG. 1E, the detection unit 11 (lens 11a) faces downward, the operation unit 10b faces the upper part, and the warning light 10a and the display unit 10c face the side of the chassis 2, so that dust is collected. A user looking into the side of the vehicle 1 can visually recognize the warning light 10a and the display unit 10c. A harness 10e is connected to the opposite side of the display unit 10c, and the harness 10e has a role of supplying electric power to the detection unit 11 and the like and transmitting the detection value obtained by the detection unit 11 to a controller (not shown). Fulfill. For example, the controller provided in the driver's seat may display and adjust the detection vertical distance L by the detection unit 11, or the controller may be provided with a warning light.

-Activation of overload detection device-
Next, the operation of the overload detection device 10 according to the present embodiment will be described.

First, as an initial setting, the minimum distance L0 of the detected unit 5a from the detected unit 11 when a load similar to the overloaded amount is applied is measured. For example, the threshold value Lmin is set at a distance slightly longer than the minimum distance L0, and the threshold value Lmin is input by operating the operation unit 10b while looking at the display unit 10c. The input operation of the threshold value Lmin may be performed by turning on the overload switch 13 at each predetermined maintenance, for example. In the present embodiment, the operation unit 10b and the display unit 10c are provided below the crossbar 4c, the display unit 10c can be easily seen from the side, and the operation unit 10b can be easily operated. The power of the overload detection device 10 is turned off when it is not needed, such as when traveling.

Then, when the dust loading operation is performed, for example, when the dust loading operation is performed, the overload switch 13 is turned on and the overload detection device 10 is turned on. In the present embodiment, for example, the power of the overload detection device 10 is turned on only when the PTO power is turned on (when the loading work is performed). When the detection data by the detection unit 11 is within the threshold value Lmin, the relay 10f is not turned on, and power is not supplied to the warning light 10a and the warning buzzer 10d.

When the dust storage box 4 approaches overload while the dust is being loaded, the detection data by the detection unit 11 reaches the threshold value Lmin, the relay 10f is turned on, the warning light 10a lights up, and the warning buzzer 10d sounds. As a result, the worker can easily recognize that the overloading will occur if the load is further increased, and the overloading can be prevented by completing the further loading.

As described above, in the present embodiment, the detection unit 11 of the overload detection device 10 provided in the dust storage box 4 directly detects the vertical distance L between the detection unit 5 and the detection unit 5a of the differential carrier 5, as in the conventional case. It is not necessary to bother to provide a signal cutoff unit to detect the switching of the presence or absence of a signal at the time of overloading, and it is not necessary to perform adjustment work by turning a butterfly net or the like for detecting overloading. Then, the threshold value Lmin itself of the detection distance may be set and changed by the operation unit 10b, and the adjustment work is extremely easy. In addition, since no mechanical configuration such as a wing nut is required, the number of parts is reduced, installation work is easy, and maintenance is easy.

Further, in the present embodiment, since the warning light 10a, the operation unit 10b, the display unit 10c, etc. are positioned below the bottom of the crossbar 4c extending from the lower vertical girder 4b in the vehicle width direction, the detection unit 11 is positioned as the chassis 2 It is easy to check from the side of, and the adjustment work is easy.

Further, in the present embodiment, when the dust storage box 4 is overloaded, not only the overloaded can be easily visually confirmed by the warning light 10a, but also the overloaded can be reliably recognized from the alarm sound by the alarm buzzer 10d. ..

Therefore, according to the garbage truck 1 according to the present embodiment, the overload detection device 10 can be easily confirmed and maintained by a simple configuration.

(Other embodiments)
The present invention may have the following configurations with respect to the above embodiment.

That is, in the above embodiment, the detection unit 11 is composed of a laser sensor, but may be composed of an infrared sensor, a non-contact proximity sensor, or the like.

Further, in the above embodiment, the dust collection vehicle 1 is a so-called dump discharge type in which the dust storage box 4 is tilted by the dump cylinder 6, but the present invention is not limited to this, and the dust discharge plate in the dust storage box is not limited to this. It can also be applied to the discharge plate discharge type having. In this case, the vertical girder of the vehicle body frame at the bottom of the dust storage box is not the upper and lower split type as in the upper vertical girder 4a and the lower vertical girder 4b of the above embodiment, but is an upper and lower integrated type.

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and uses.

1 Garbage truck
2 chassis
2a Undercarriage
2b chassis frame
2c wheels
2d suspension
3 Garbage input box
3a controller
4 Garbage storage box
4a First vertical girder
4b Last vertical girder
4c crossbar
5 Differential carrier
5a Detected part
6 Dump cylinder
7 muffler
10 Overload detection device
10a Warning light
10b operation unit
10c display unit
10d alarm buzzer
10e harness
10f relay
11 Detection unit
11a lens
11b O-ring
11c lens cover
11d outer cover
12 Sensor mounting bracket
13 Overload switch
L Vertical distance
Lmin threshold

Claims (3)

A chassis with a chassis frame supported by the undercarriage, including differential gear, and
The dust storage box mounted on the above chassis frame and
A dump cylinder for tilting the dust storage box,
In a garbage truck having an overload detection device for detecting overload of the dust storage box.
At the bottom of the dust storage box,
A pair of left and right upper vertical girders attached along the bottom plate of the dust storage box and a pair of left and right lower vertical girders connected to the upper vertical girder via a dump hinge and attached on the chassis frame are provided. ,
The dump cylinder is configured to tilt the dust storage box together with the upper vertical girder so that a space is created between the lower vertical girder and the upper vertical girder.
The above overload detection device is
It is provided below the bottom plate portion of the dust storage box, and is provided with a detection unit that detects the vertical distance between the differential carrier accommodating the differential gear and the detected portion in a non-contact manner.
It is configured to detect the overload of the dust storage box from the measurement data of the detection unit.
An operation unit is provided in the upper part of the detection unit, a lens cover is provided in the lower part of the detection unit, and the detection unit is covered with an outer cover that covers the periphery of the lens cover.
The detection unit is attached via a crossbar extending in the vehicle width direction from one of the pair of left and right lower vertical girders.
The crossbar is provided so as not to be located directly above the operation unit.
A garbage truck that features that. In the garbage truck according to claim 1 .
The overload detection device is a garbage truck characterized by being provided with a warning light and an alarm buzzer that illuminate when an overload is detected. In the garbage truck according to claim 1 or 2 .
The overload detection device is a garbage truck characterized in that a display unit indicating a vertical distance to the operation unit and the detected unit is provided below the bottom of the crossbar.

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