JPH0340802Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device that warns when the load capacity of a garbage collection vehicle reaches a set value.

Prior Art Figure 2 is a schematic diagram of a general garbage collection vehicle, in which 1 is the vehicle body, 2 is a front garbage storage box, 3 is a rear garbage input box, 4 is a rotary scraping plate, and 5 is a push plate. , 6 indicates the operating cylinder, and the garbage put into the rear garbage input box 3 is scraped up from the bottom of the rear garbage input box 3 by the rotary scraping plate 4, and the garbage thrown into the rear garbage input box 3 is scraped up from the bottom of the rear garbage input box 3 by the pushing plate 5.
When the garbage is pushed inside and becomes fully loaded, the garbage goes to a garbage disposal site, the rear garbage input box 3 is reversed and opened rearward, and the front garbage storage box 2 is raised and dumped rearward to discharge the garbage.

In general, the garbage collection vehicle patrols the garbage collection area and collects garbage, and when it is full, it goes to the garbage disposal site, discharges the loaded garbage, and returns to the garbage collection area to repeat the collection of garbage. There is.

In this case, the garbage disposal site is often located in a relatively remote location, and there is a strong tendency to try to reduce the amount left behind in the garbage collection area, so the garbage often returns to the garbage disposal site in an overloaded state.

However, when trying to discharge garbage in an overloaded state, the center of gravity of the garbage truck moves backwards when the front garbage storage box is raised and dumped backwards, causing the garbage truck to lose its balance and fall backwards. There is,
It was extremely dangerous.

Problems that the invention aims to solve Conventionally, there was no means to warn against overloading as described above, and workers were required to judge the load amount by visual measurement and carry out the work. There is.

Since this cannot reliably prevent overloading, countermeasures are desired.

However, if an attempt is made to install something such as a loading weight scale to prevent overloading, the equipment is not easy to install, becomes expensive, and malfunctions occur frequently.

For example, there is a loaded weight meter that detects the loaded weight by utilizing the fact that the dimension between the rear vehicle and the vehicle body, which is attached to the vehicle body via a suspension system, changes depending on the size of the load. Therefore, when a garbage collection truck travels around the collection area to collect and load garbage in small units, malfunctions are unavoidable due to traveling vibrations when moving between collection locations, and the above-mentioned Model loading scales are expensive;
Moreover, it is inconvenient and difficult to install.

Means for Solving the Problems In view of the above problems, this invention utilizes the garbage loading mechanism installed in garbage collection vehicles and provides an overload warning device that can be easily and inexpensively installed on a part of the garbage collection vehicle. The structure is such that first and second pressure switches with different specified pressures are provided in the hydraulic circuit of the actuating cylinder of the pushing plate that pushes the garbage thrown into the rear garbage input box into the front garbage storage box. The first and second pressure switches have first and second electromagnetic counters that add up the number of times the first and second pressure switches are activated when the hydraulic pressure in the hydraulic circuit of the operating cylinder exceeds the specified pressure. Further, when the first electromagnetic counter reaches a preset value, a first warning means such as a lamp is activated, and a first pressure switch having a lower specified pressure is connected to the first pressure switch. A first keep relay that switches the energization to a second pressure switch with high pressure is connected, and the second electromagnetic counter is connected to the second pressure switch.
It consists of an electric circuit connected to a second keep relay that activates a second warning means such as a lamp when the electromagnetic counter reaches a preset value.

Effect The hydraulic pressure during the pushing process of the garbage collection vehicle is the first
When the pressure exceeds the specified pressure of the hydraulic switch, the first pressure switch is activated, and the first electromagnetic counter adds up the number of times the first pressure switch has activated, and when the number reaches a preset value, the first pressure switch is activated. The keep relay issues a warning using the lamp of the first warning means, and at the same time, the power is switched from the first pressure switch to the second pressure switch to change the specified value of the hydraulic pressure to a value higher than the above, and this new specified value is exceeded. When the hydraulic pressure in the hydraulic circuit of the operating cylinder increases, the second pressure switch is activated, and the number of times this second pressure switch is activated is added up by the second electromagnetic counter, and the number of times becomes a preset value. At times, a warning is issued by the second keep relay using a second warning means such as a lamp.

Embodiment Figure 1 is a wiring diagram of an electric circuit showing an embodiment of the overload warning device for a garbage collection vehicle according to this invention, where F is a fuse and SW ₁ is installed in the driver's seat of the garbage collection vehicle. Switch for loading and unloading garbage, SW ₂ is a switch for raising and lowering the input box installed inside the driver's seat of the garbage truck, LS ₁ is for TP
a limit switch that closes in connection with the operation of O;
LS ₂ is a limit switch for confirming the lowering of the front cargo box.
PB is an emergency stop push button switch, CR ₃ is a third relay connected to the rising terminal of changeover switch SW ₂ via the first timer T 1, and CR _{1 -} a is for activation of the first relay (not shown). normally open contacts that twist closed;
CR ₁ -b is a normally closed contact that opens when the first relay is activated, CR ₂ -a is a normally open contact that is closed when a second relay (not shown) is activated, and CR ₃ -a is the above-mentioned contact that is closed when the second relay (not shown) is activated. 3 normally open contacts that are closed by the operation of the 3rd relay CR ₃ , CR ₃ -b, CR ₃ -b are normally closed contacts that are opened by the operation of the 3rd relay CR ₃ , SOL ₁ is the normal rotation coil,
SOL ₂ is a pushing and raising coil, SOL ₃ is a lowering coil, PRS ₁ is a first pressure switch that operates when the hydraulic circuit of the hydraulic cylinder that operates the pushing plate reaches a specified pressure, for example, 120 kg/cm ² or more, PRS ₂ is a second pressure switch that operates when the hydraulic circuit of the hydraulic cylinder that operates the push plate reaches a specified pressure higher than that of the first pressure switch PRS ₁ , for example, 130 kg/cm ² or more, and T ₂ is the first pressure switch. A second timer connected to PRS ₁ , T ₃ is said second pressure switch
A third timer connected to PRS ₂ , T ₂ -a is a normally open contact that closes when the second timer T ₂ operates, and T ₃ -a is a normally open contact that closes when the third timer T ₃ operates. The open contact MCT ₁ is the first pressure switch PRS ₁ that counts the number of actuations of the first pressure switch PRS 1.
Electromagnetic counter, MCT ₂ is the second pressure switch
a second electromagnetic counter that counts the number of activations of PRS ₂ ; KR ₁ is a first keep relay connected to the first electromagnetic counter MCT ₁ ; KR ₂ is a second keep relay connected to the second electromagnetic counter MCT ₂ ; The relays, KR ₁ -a and KR ₁ -a are the first keep relays.
Normally open contact closed by actuation of KR ₁ , KR ₁ −
b is a normally closed contact that opens when the first keep relay KR ₁ is activated; KR ₂ -a is a normally open contact that is closed when the second keep relay KR ₂ is activated; KR ₂
-b is a normally closed contact that opens when the second keep relay KR ₂ is activated, and PL is connected to changeover switch SW ₁ , which lights up to indicate that the operation is in progress, whether loading or unloading garbage. pilot lamp,
YL is a pilot lamp that lights up when the number of integrations of the first electromagnetic counter MCT ₁ reaches a preset number, and RL is the second electromagnetic counter MCT _2.
A pilot lamp lights up when the cumulative number of times reaches a preset value to warn that the specified load has been reached, C ₁ and C ₂ are capacitors, R ₁ and R ₂ are resistors,
D ₁ to D ₇ are diodes that connect these electrical components to the
Connect as shown to form an overload warning circuit.

In the above configuration, during the garbage pushing process, from the power supply, fuse F, PTO limit switch LS ₁ ,
Changeover switch SW ₁ , emergency stop push button switch PB,
1st relay contact CR ₁ -b, 2nd relay contact
Current flows through CR ₂ -a to the pushing and lifting coil SOL ₂ . In this state, the amount of dust in the input box increases and the first pressure switch PRS ₁ changes to the specified pressure [120
Kg/cm ² ] or more, the first pressure switch PRS ₁ is activated and current flows through the second timer T ₂ , which causes the second timer T ₂ to close its contact T ₂ after a specified time. -a is closed, and current flows through the coil of the first electromagnetic counter MCT ₁ . Then, when the pushing process ends or the hydraulic pressure of the first pressure switch PRS ₁ decreases, the current flowing through the coil of the first electromagnetic counter MCT ₁ is cut off. Then, the first electromagnetic counter MCT ₁ adds 1 to the cumulative number of times.

In this way, when the number of integrations of the first electromagnetic counter MCT ₁ reaches the preset number, the contacts of the first electromagnetic counter MCT ₁ close and the current is transferred from the changeover switch SW ₁ to the contacts of the first electromagnetic counter MCT ₁ , the first Flows to the set coil of keep relay KR ₁ . As a result, the first keep relay KR ₁ is set, the contacts KR ₁ -a and KR 1 -a are closed, and the contacts KR 1 -a and KR ₁ -a are closed.
Since KR ₁ -b is open, the current flows through limit switch LS ₁ , contact KR ₂ -b of second keep relay KR ₂ ,
The flow passes through the contact point KR ₁ -a of the first keep relay KR ₁ and flows to the pilot lamp YL.
lights up. In addition, in the above state, the current does not flow to the first pressure switch PRS ₁ but to the second pressure switch PRS ₂ , so the dust in the input box increases further and the specified pressure [130Kg/cm ^{2 ]} is applied to the second pressure switch PRS ₂ . ] When the pressure above is applied, the second pressure switch PRS ₂ is activated and a current flows to the third timer T ₃ , which causes the third timer T ₃ to close its contact T ₃ after a specified time.
-A is closed, so the current is the second electromagnetic counter
Flows into the MCT ₂ coil. Similarly to the first electromagnetic counter MCT ₁ , a second electromagnetic counter
When the cumulative number of times MCT ₂ reaches a preset number, the contacts of the second electromagnetic counter MCT ₂ close, and current flows through the set coil of the second keep relay KR ₂ . As a result, the second keep relay KR ₂ becomes set, its contact KR ₂ -a closes, and its contact KR ₂ -b opens, causing the pilot lamp to close.
The current flowing through YL is cut off, the pilot lamp YL goes out, and the pilot lamp RL turns off.
A current flows through and the pilot lamp RL lights up.

Once current is applied to the set side coil of the first and second keep relays KR ₁ and KR ₂ , even if the current is cut off, the contacts maintain that state until current is applied to the reset side coil. As a result, the pilot lamp YL will remain lit until the pilot lamp RL is lit, and once the pilot lamp RL is lit, the pilot lamp RL will remain lit until the pilot lamp RL lights up.
It is always lit when O is connected.

Next, in order to reset this state, switch SW ₁ is set to the discharge side and switch SW ₂ is set to the rise side, and the current is switched to the contact CR of the third relay CR ₃ after the time set by the first timer T ₁ . ₃ -a to the reset contacts of the first and second electromagnetic counters MCT ₁ and MCT ₂ and the reset coils of the first and second keep relays KR ₁ and KR ₂ , thereby causing the first and second electromagnetic counters MCT ₁ , MCT ₂ has 0 integration times
Therefore, the first and second keep relays KR ₁ and KR ₂ enter the reset state. 1st and 2nd keep relay
When KR ₁ and KR ₂ are in the reset state, their contacts
KR ₁ -a, KR ₂ -a open and pilot lamp
The current flowing through YL or pilot lamp RL is cut off, and pilot lamps YL and RL go out.

Effects of the device This device increases the amount of garbage loaded into the front garbage storage box by the pushing plate, and takes advantage of the increased pushing force to operate the pressure switch with the pushing pressure corresponding to the full load. It is possible to display and alarm overloading, therefore, an inexpensive pressure switch can be used as an overload detection means, and there is no fear of malfunction due to running vibrations, etc., and a part of the garbage loading mechanism can be used. It is easy to use and install, and can easily and inexpensively prevent overturning accidents caused by imbalance caused by overloading of this type of garbage collection vehicle. In addition, since it is a two-step system in which a warning is issued just before the vehicle is fully loaded and a warning is issued using a warning means other than the above when the vehicle is almost fully loaded, the fully loaded warning can be effectively performed and the warning can be given reliably.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram of an electric circuit showing an embodiment of this invention, and FIG. 2 is a schematic diagram of a garbage collection vehicle to which this invention is applied. PRS ₁ , PRS ₂ ... Pressure switch, T ₂ , T ₃ ...
Timer, MCT ₁ , MCT ₂ ...electromagnetic counter,
KR ₁ , KR ₂ ...Keep relay.

Claims (1)

[Scope of Claim for Utility Model Registration] First and second pressure switches with different specified pressures are provided in the hydraulic circuit of the actuating cylinder of the pushing plate that pushes the garbage put into the rear garbage input box into the front garbage storage box. The first and second pressure switches are provided with first and second electromagnetic switches that add up the number of times the first and second pressure switches are activated when the hydraulic pressure in the hydraulic circuit of the operating cylinder exceeds the specified pressure. The counters are respectively connected to the first electromagnetic counter, and when the first electromagnetic counter reaches a preset value, a first warning means such as a lamp is activated, and a first pressure switch having a low specified pressure is activated. A first keep relay that switches the energization to a second pressure switch with a higher specified pressure is connected, and a second warning means such as a lamp is installed in the second electromagnetic counter when the second electromagnetic counter reaches a preset value. An overload warning device for a garbage collection vehicle, comprising an electric circuit connected to a second keep relay that operates the overload warning device.