JPS6329788Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an emergency stop device for a concrete pump truck that pumps fluid concrete to a concrete pouring site such as a building site or a construction site from a location away from the pouring site. be.

The concrete pump truck that pumps the supplied fluid concrete to concrete pouring sites such as construction sites and construction sites uses the driving force generated by the engine installed in the concrete pump truck as a hydraulic source via a gearbox. A pair of cylinders that are supplied to a hydraulic pump and suck in and discharge fluid concrete using the hydraulic pressure obtained by the hydraulic pump, and a swing pipe that is alternately connected to one of these cylinders. Each part of the device is driven to pump the supplied concrete to a predetermined location. Therefore, in the case of concrete pump trucks that use hydraulic pressure to drive each part of the equipment, if a problem occurs with the hydraulic system that drives each part of the equipment or with the electrical system that controls this hydraulic system, etc. In some cases, the hydraulic system, such as the switching valve, becomes unable to switch, resulting in an extremely dangerous situation where the boom or the like cannot stop.

In the event of a problem with the hydraulic system or electrical system, the worker will usually be able to directly
The dangers caused by such troubles are avoided by cutting off the gearbox drive system or stopping the engine in an emergency to stop the hydraulic pump.

By the way, when the above-mentioned trouble occurs, if the worker is operating the concrete pump truck directly or in the vicinity of the concrete pump truck, the danger can be avoided as described above. If a worker is operating the concrete pump truck remotely while holding the concrete pump vehicle's remote control device, operations such as turning off the gearbox drive system or stopping the engine in an emergency cannot be done immediately. Therefore, there is a problem in that the damage caused by the above-mentioned troubles increases.

In view of the above points, this invention allows the engine of the concrete pump truck to be stopped in an emergency even when a worker is remotely controlling the concrete pump truck. This system provides an emergency stop device for concrete pump trucks that can minimize damage caused by trouble even when a trouble occurs. a detection means for detecting that a driven engine stop lever is at an engine stop position or a return position; a motor that powers the driving means; and a switching means for driving the motor in forward and reverse directions based on the output of the detection means; It is equipped with an off means for turning off the power of the operation circuit of the concrete pump vehicle, and a switch means for starting the motor and the off means, and when the switch means is operated, the off means is started and the power supply is turned off. turning off and driving the motor forward to move the engine stop lever to a stop position, and after stopping the engine, driving the motor in reverse to return the engine stop lever to a return position. It is characterized by

An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows an example of the circuit configuration of an emergency stop device for a concrete pump vehicle according to the present invention. In this figure, ₁₁ is a terminal connected to the positive terminal of a battery (power source) not shown,
This terminal ₁₁ is connected to one end of a normally closed contact 2b of relay 2, one end of a normally open contact 3a of relay 3, and one end of a load 4. The other end of the normally closed contact 2b is connected to one end of relay 3, the other end of which is connected to terminal ₁₂ which is connected to the negative terminal of the battery. Here, relay 3 is a relay in which terminal ₁₁ is connected to the positive terminal of the battery and terminal ₁₂ is connected to the negative terminal of the battery, and which is in an operating state when relay 2 is in a non-operating state, thereby closing the normally open contact 3a.

The other end of the normally open contact 3a is connected to a power supply end (not shown) provided in the operation circuit of the concrete pump vehicle, and the other end of the load 4 is connected to one end of the relay 5 and the normally open contact of the relay 6. One end of the contact 6a,
One end of each of the normally open contacts 7a ₁ and 7a ₂ of the relay 7 is connected to one end of the normally open switch 8. Here, the relay 5 is in the operating state when the timer 9 is in the operating state (timekeeping state), and the normally open contacts 5a ₁ and 5a ₂
This is a relay that closes the normally closed contacts 5b 1 and 5b ₂ and opens the normally closed contacts 5b ₁ and 5b 2 . The other end of the relay 5 is a normally open contact 9a whose opening/closing is controlled by a timer 9.
The normally open contact 9a is connected to one end of the normally open contact 9a, and the other end of the normally open contact 9a is connected to the terminal ₁₂ .

The other end of the normally open contact 6a is connected to one end of each limit switch 10, 11, the other end of the limit switch 10 is connected to one end of the normally closed contact _5b1 , and the other end of the normally closed contact _5b1 is connected to one end of the motor 12. and one end of normally open contact 5a ₂ , and the other end of normally open contact 5a ₂ is terminal 1 ₂
, respectively, and limit switch 1
The other end of 1 is a normally open contact 5a.The other end of ₁ is a normally open contact 5a.
The other end of _a1 is connected to the other end of motor 2 and one end of normally closed contact _5b2 , the other end of normally closed contact _5b2 is connected to terminal ₁₂ ,
Each is connected. Here, the limit switch 11 is a limit switch that becomes open when the slide shaft 14 of the power cylinder 13 shown in FIG.
is a limit switch that opens when the extending distance of the slide shaft 14 becomes less than a predetermined distance, and the motor 12 is a limit switch that is operated to drive the slide shaft 14 of the power cylinder 13 in the direction of arrow A or in the opposite direction to arrow A. It's a motor.

Further, the other end of the normally open contact 7a ₁ is connected to one end of each of the relays 2 and 6 and one end of the timer 9, and the other end of each of the relays 2 and 6 and the other end of the timer 9 is connected to the terminal ₁₂ , respectively.
It is connected. Here, the relays 2 and 6 are in operation when the relay 7 is in the operation state, and are respectively relays that open the corresponding normally closed contact 2b and close the normally open contact 6a, and,
The timer 9 is a timer that starts its timing operation when the relay 7 becomes operational, and then closes the normally open contact 9a when the predetermined timing ends.

The other end of the normally open contact 8 is connected to one end of the relay 7, the other end of the normally open contact _7a2 , and one end of the timer 15, and the opening and closing of the other end of the relay 7 is controlled by the timer 15. One end of the normally closed contact 15b, the other end of the normally closed contact 15b, and the other end of the timer 15 are connected to the terminal ₁₂ , respectively. Here, the normally open switch 8 is a switch for starting the operation of this circuit, and the relay 7 is activated when the normally open switch 8 is closed, and the normally open contact 7 is activated.
This is a relay that closes a ₁ and 7a ₂ . In this case, a hold circuit for the relay 7 is configured by the relay 7, the normally open contact 7a ₂ , and the normally closed contact 15b. Further, the timer 15 starts its timing operation when the normally open switch 8 is closed and the relay 7 is activated, and after that, when the predetermined timing is finished, the normally closed contact 15b
This is a timer that opens the . Note that the time from when the timer 15 starts its timing operation to when it ends its timing operation is set to be longer by a predetermined time than the time from when the timer 9 starts its timing operation until it ends its timing operation. is set to .

FIG. 2 is a diagram showing an example of the configuration of the engine stop mechanism portion of the same embodiment. In this figure, 16 is an engine stop knob installed in the driver's seat of the concrete pump truck to which this device is applied, and when this engine stop knob 16 is operated,
The wire 17 engaged with the engine stop knob 16 moves in the opposite direction of arrow A, and as a result, the engine stop lever 18, one end of which is fixed to the wire 17, moves clockwise around the other end. The engine 19 is rotated to stop the engine 19. Further, one end of the wire 17 is fixed to one end of the slide shaft 14 of the power cylinder 13, and even if this slide shaft 14 moves in the opposite direction of arrow A, the engine stop lever 18 similarly rotates clockwise. , the engine 19 is stopped. In addition, the relay 3 mentioned above is an OFF means, the relay 5 is a switching means, the limit switches 10 and 11 are a detection means, and the power cylinder 13 is a driving means. Further, the normally open switch 8 is the first switching means, and the relay 2 is the second switching means.
The relay 6 is the third switching means.

In the above configuration, when terminal 1 ₁ is connected to the positive terminal of the battery and terminal 1 ₂ is connected to the negative terminal of the battery, and power is supplied to the circuit, relay 3 becomes operational and the normally open contact 3a in the closed state, thereby connecting terminal 1 ₁ and normally open contact 3a.
Power is supplied from the battery to the operation circuit via the battery, and operation of the concrete pump truck remotely controlled by the remote control device equipped with this emergency stop device is started. In this state, when a trouble occurs in the hydraulic system, electrical system, etc. of the concrete pump vehicle, and the operator (worker) presses the normally open switch 8, this causes the terminals 1 ₁ ,
Timer 15 via load 4 and normally open switch 8
Power is then supplied to the relay 7, and as a result, the relay 7 is activated and the normally open contacts 7a ₁ and 7a ₂ are closed. As a result, the relay 7 is self-held, and the timer 15 starts its timing operation.

Also, in parallel with this operation, terminal 1 ₁ , load 4,
Power is supplied to the timer 9 and the relays 2 and 6 sequentially through the normally open contact _7a1 , so that the timer 9
starts its timing operation, and relays 2 and 6
becomes an operating state, and the normally closed contact 2b is opened and the normally open contact 6a is closed. As a result, the relay 3 becomes inactive, and the normally open contact 3a is opened, thereby turning off the power to the operating circuit. At the same time, terminal 1 ₁ → load 4
A current flows through the following path: → normally open contact 6a → limit switch 10 → normally closed contact 5b ₁ → motor 12 → normally closed contact 5b ₂ → terminal 1 ₂ , and the motor 12 is energized.
As a result, the motor 12 moves the slide shaft 14 of the power cylinder 13 in the opposite direction of arrow A, rotates the engine stop lever 18 clockwise, and stops the engine 19. Then, when the slide shaft 14 is further moved in the direction opposite to the arrow A and the extended distance of the slide shaft 14 becomes less than a predetermined distance, the limit switch 10 detects this and its contact becomes open. As a result, the motor 12
stops, and the slide shaft 14 stops at that position. In this state, when the timer 9 completes the predetermined time measurement and the normally open contact 9a is closed,
Power is supplied to the relay 5 via the terminal 1 ₁ and the load 4 in order, and as a result, the relay 5 becomes operational, opening the normally closed contacts 5b ₁ and 5b ₂ , and opening the normally open contacts 5a ₁ , 5a ₂ to the closed state. As a result, current flows through the following path: terminal 1 ₁ → load 4 → normally open contact 6a → limit switch 11 → normally open contact 5a ₁ → motor 12 → normally open contact 5a ₂ → terminal 1 ₂ , and motor 12 moves in the above-mentioned direction. Forced in the opposite direction.
As a result, the motor 12 moves the slide shaft 14 of the power cylinder 13 in the direction of arrow A, closes the contact of the limit switch 10, and rotates the engine stop lever 18 counterclockwise. Then, when the slide shaft 14 is further moved in the direction of arrow A and the extended distance of the slide shaft 14 exceeds a predetermined distance, the limit switch 11 detects this and opens its contact. As a result, the motor 12 stops, and the slide shaft 14 stops at that position, that is, the position before the normally open switch 8 is pressed. In this state, when the timer 15 finishes measuring a predetermined time and opens the normally closed contact 15b, the relay 7
The self-holding circuit of is cut off, relay 7 becomes inactive, and all operations of this circuit are terminated.

In this way, by simply pressing the normally open switch 8, the operating circuit is turned off and the engine 1 is turned off at the same time.
9 and after the engine 19 is stopped, an operation is performed to return the circuit to its original state (initial state).

In addition, in the above-mentioned embodiment, the case where remote control of the concrete pump truck is performed using a wired method has been explained, but this can also be done by remotely controlling the concrete pump vehicle using a wireless method and stopping the engine of the concrete pump vehicle. Of course, it is also possible to perform operations. In this case, the normally open switch 8 is a normally open contact provided in the receiver, and when the normally open contact is pressed on the switch provided in the radio box (transmitter), the normally open contact is closed. It may be configured as follows.

As explained above, this invention includes a driving means for driving the engine stop lever, a detecting means for detecting that the engine stop lever driven by the driving means is at the engine stop position or the return position. A motor that powers the drive means, a switching means for rotating the motor in forward and reverse directions based on the output of the detection means, an off means for turning off power to an operating circuit of the concrete pump vehicle, and the motor and the off means. and a switch means for starting, and by operating the switch means,
The off means is activated to turn off the power source, the motor is driven in forward rotation to move the engine stop lever to the stop position, and after the engine is stopped, the motor is driven in reverse to stop the engine. Since the stop lever is returned to the return position, the following effects can be achieved.

The concrete pump engine can be stopped in an emergency.

After stopping the engine, the engine stop lever can be returned to the return position. Thereby, the engine can be stopped without affecting the engine stop knob or the like provided in the driver's seat of the concrete pump vehicle. Therefore, there is an advantage that there is no need to consider the position of the engine stop lever in subsequent operations.

The power to the concrete pump vehicle's operating circuit can also be turned off, preventing wasted power.

According to the above, even if trouble occurs in the hydraulic system and electrical system of the concrete pump vehicle, damage caused by this trouble can be minimized.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of the circuit configuration of the emergency stop device for a concrete pump truck according to this invention, and Figure 2
The figure is a diagram showing an example of the configuration of the engine stop mechanism portion of the same embodiment. 3... Relay (off means), 5... Relay (switching means), 8... Normally open switch (switching means),
10, 11... limit switch (detection means),
12... Motor, 13... Power cylinder (driving means), 18... Engine stop lever.

Claims (1)

[Scope of utility model registration request] An engine stop lever, a motor, and the motor is used as power to move the engine stop lever to an engine stop position when the motor is driven in the forward direction, and to move the engine stop lever to the engine stop position when the motor is driven in the reverse direction. A driving means for moving the top lever to a return position, a detection means for detecting that the engine stop lever is in an engine stop position or a return position, and switching for rotating the motor in the forward and reverse directions in cooperation with the output of the detection means. means, an off means for turning off the power of the operation circuit of the concrete pump vehicle, a first switch means, a second switch means for starting the off means by operation of the first switch means, and a second switch means for starting the off means by operation of the first switch means; a third switch means for rotating the motor in the forward direction via the switching means when the first switch means is operated; and a timer for switching the switching means and rotating the motor in the reverse direction a predetermined time after the operation of the first switch means. An emergency stop device for a concrete pump truck, comprising: