JP2008240461A - Overload preventing system and overload preventing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overload preventing system by which overload on a carrier is surely prevented irrespective of specifications of the carrier. <P>SOLUTION: In the overload preventing system, the carrier comprises a load quantity detecting means 33 detecting the load quantity of the carrier, a travelling state judging means 34 judging whether the carrier is in a travelling state, a load state judging means 39 judging whether the load quantity reaches a predetermined value, a load prohibition command transmitting means 40 transmitting the load prohibition command to a loading machine when the load quantity reaches the predetermined value, and a prohibition cancellation command transmitting means 41 transmitting a prohibition cancellation command to the loading machine to cancel the load prohibition command when the carrier is judged to be in a travelling state. The loading machine comprises a working machine for performing loading work, a receiving means receiving the load prohibition command and the prohibition cancellation command, and a working machine operation prohibiting means prohibiting operation of the working machine when the load prohibition command is received and canceling the prohibition of the operation of the working machine when the prohibition cancellation command is received. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an overload prevention system and an overload prevention method for preventing overloading of a transporter by a loader.

Among construction machines, there are loaders such as excavators and wheel loaders. These loaders have a work machine for performing a load operation, and an operator of the loader operates the work machine to load a load on a transporter such as a tampon truck.
The maximum load capacity of the transporter is determined for each specification of the transporter for safety reasons, and it is necessary to prevent the load exceeding the maximum load capacity. Therefore, the transporter is provided with a load amount display lamp for displaying according to the load amount of the load for the purpose of informing the load state of the transporter. The operator of the loader recognizes the load state of the transporter while looking at the load amount display lamp of the transporter, and adjusts the load amount on the transporter.

  On the other hand, the load acting on the loader is integrated on the loader side, and when this integrated value exceeds the limit value, a warning buzzer provided on the loader warns the operator. (For example, refer to Patent Document 1). As a result, the operator recognizes that the load capacity of the transporter has reached the maximum load capacity and prevents overloading of the transporter.

JP 2004-347560 A

However, the load amount display by the load amount display lamp does not have sufficient display accuracy of the load amount, so that there is a possibility that the load amount exceeds the maximum load amount regardless of the operator's intention.
Further, in the configuration of Patent Document 1, the limit value for loading is switched by a switch. For this reason, when the maximum loading capacity of the transporter is not known, the limit value itself switched by the switch becomes an inaccurate value, and there is a problem that no warning is issued even in the overloading state. .
Furthermore, in any of the above-described configurations, only the operator is warned with a lamp or a buzzer. Therefore, there is a problem that loading can be performed exceeding the maximum loading capacity depending on the operation of the operator.

  An object of the present invention is to provide an overload prevention system and an overload prevention method capable of reliably preventing overloading on a transporter regardless of the specifications of the transporter.

  An overload prevention system according to a first aspect of the present invention is an overload prevention system for preventing overloading on a transporter by a loader, wherein the transporter detects a load amount of the transporter. A traveling state determination unit that determines whether or not the transporter is in a traveling state, a loading state determination unit that determines whether or not the load amount of the transporter has reached a predetermined value, and the loading state A loading prohibition command for transmitting a loading prohibition command for prohibiting the loading operation of the loader to the loading machine when the determination unit determines that the loading amount of the transporter has reached a predetermined value. A transmission unit, and a prohibition release command transmission unit that transmits a prohibition release command for canceling the loading prohibition command to the loader when the traveling state determination unit determines that the transporter is in a traveling state. The loader includes a load of the load. A working machine that performs work, a receiving unit that receives the loading prohibition instruction and the prohibition release instruction, and the operation of the work machine is prohibited when the loading prohibition instruction is received, and the prohibition release instruction is received And a work machine operation prohibiting means for releasing the prohibition of the operation of the work machine.

  An overload prevention system according to a second aspect of the present invention is an overload prevention system for preventing an overload on a transporter by a loader, wherein the transporter detects a load amount of the transporter. A transporter information transmission unit that transmits the load amount of the transporter detected by the loader detection unit to the loader, and a travel state determination that determines whether the transporter is in a travel state And a prohibition release command transmitting means for transmitting a prohibition release command for canceling the loading prohibition command to the loader when the traveling state determination means determines that the transporter is in a traveling state. The loader determines whether or not the loader of the loader has reached a predetermined value, a work machine that loads the load, a receiving unit that receives the prohibition release command, and the loader Loading state determination means and the loading state determination means The operation of prohibiting the operation of the work machine when it is determined that the load amount of the transporter has reached a predetermined value and releasing the prohibition of the operation of the work machine when the prohibition release command is received. And machine operation prohibiting means.

  In the overload prevention system according to a third aspect of the present invention, in the first or second aspect, the load amount detection means detects the weight of the load loaded on the transporter, and the load state determination means It is determined whether or not the weight of the load of the transporter has reached a predetermined value.

  An overload prevention method according to a fourth aspect of the present invention is an overload prevention method for preventing overloading on a transporter by a loader, wherein in the transporter, detecting a load amount of the transporter, A step of determining whether or not the transporter is in a traveling state; a step of determining whether or not the load amount of the transporter has reached a predetermined value; and the loading of the transporter in the load state determination means When it is determined that the amount has reached a predetermined value, a step of transmitting a loading prohibition command for prohibiting the loading operation of the loader to the loader; And a step of transmitting, to the loader, a prohibition release command for canceling the loading prohibition command when it is determined that the vehicle is in a traveling state. Step to receive command When the loading prohibition command is received, the operation of the work machine that performs the loading operation of the load is prohibited, and when the prohibition release command is received, the prohibition of the operation of the work machine is canceled. And a step of performing.

  An overloading prevention method according to a fifth aspect of the present invention is an overloading prevention system for preventing overloading on a transporter by a loader, wherein in the transporter, detecting a load amount of the transporter; A step of transmitting the load amount of the transporter detected by the load amount detection means to the loader; a step of determining whether or not the transporter is in a travel state; and And a step of transmitting, to the loader, a prohibition release command for canceling the loading prohibition command when it is determined that the transporter is in a traveling state, and the loading machine receives the prohibition cancellation command. Performing a loading state determination unit that determines whether or not the loading amount of the transporter has reached a predetermined value, and the loading amount of the transporter has reached a predetermined value in the loading state determination unit Judgment And a step of prohibiting the operation of the work machine that performs the loading work of the load, and releasing the prohibition of the operation of the work machine when the prohibition release command is received. Features.

According to the overload prevention system according to the first aspect of the present invention, the transporter determines whether or not the load amount has reached a predetermined value, and transmits a load prohibition command to the loader. The operation of the work machine is prohibited based on the insertion prohibition command. According to this, since the loading state of the transporter is determined using the highly accurate load amount detected on the transporter side, it is possible to accurately transmit the loading prohibition command to the loader.
Further, since the loader prohibits the operation of the work machine based on the load prohibition command, the operation of the work machine is forcibly prohibited regardless of the operation of the operator.
Furthermore, the transporter transmits a prohibition release command to cancel the prohibition of loading work to the loader when it is determined that the transporter is in a traveling state, and the loader receives the prohibition release command from the transporter. In order to cancel the prohibition of the operation of the work machine at this time, the prohibition of the operation of the work machine is canceled after the transporter travels and cannot be loaded any more.
Therefore, it is possible to reliably prevent overloading the transporter.

  According to the overload prevention system according to the second invention, the transporter transmits the load amount to the loader, and the loader determines whether or not the load amount transmitted from the transporter has reached a predetermined value. And prohibit the operation of the work equipment. According to this, similarly to the first invention, the operation of the work machine is prohibited using the highly accurate load amount detected on the transporter side, and the transporter travels and cannot be loaded any further. Since the prohibition of the operation of the work machine is canceled after that, overloading on the transport machine can be surely prevented regardless of the operation of the operator.

  According to the overload prevention system according to the third aspect of the present invention, the weight of the load on the transporter is detected and it is determined whether or not the weight of the load has reached a predetermined value. Can be determined. Therefore, overloading on the transporter can be prevented more reliably.

  According to the overloading prevention method according to the fourth and fifth aspects of the invention, it is possible to provide an overloading prevention method that exhibits the same effects as the first and second aspects of the invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the second embodiment to be described later, the same components as those in the first embodiment to be described below are denoted by the same reference numerals and the description thereof is omitted.

[First Embodiment]
[1-1] Overall Configuration of Overload Prevention System 100 In FIG. 1 showing the overload prevention system 100 according to the first embodiment of the present invention, the overload prevention system 100 includes a dump truck 1 and an excavator 2. Is done.

  As shown in FIG. 1, the dump truck (transporter) 1 is a transport vehicle in which a vessel 11 on which earth and sand are loaded is undulated, and includes a communication terminal 12, a communication antenna 13, an overload prevention controller 3A, And a monitor panel. Of these, the communication terminal 12 is configured to transmit and receive data to and from the excavator 2 via the communication antenna 13 and to communicate with the overload prevention controller 3A. The overload prevention controller 3 </ b> A is configured as a control unit that performs overload prevention control on the dump truck 1 side in the overload prevention system 100. The overload prevention controller 3A will be described later in detail. Such a dump truck 1 is provided with a wheel speed sensor 151 that detects the rotational speed of the wheel 15 and a pressure sensor 161 that detects a pressure acting on the suspension damper 16. A signal is output to the overload prevention controller 3A.

  In FIG. 1, an excavator (loader) 2 includes a work machine 21 for loading earth and sand on a transport vehicle such as a dump truck 1, and a swing body 22 provided with the work machine 21. 1 includes a communication terminal 23, a communication antenna 24, an overload prevention controller 5A, a work machine controller 25, and a monitor panel 26.

  The work implement 21 includes a boom 211, an arm 212, and a bucket 213, and a tip end portion of the boom 211 is pivoted on the swing body 22 so as to be swingable in the vertical direction. An arm 212 is pivotally pivoted about the horizontal axis at the tip of the boom 211, and a bucket 213 is pivotally pivoted about the horizontal axis at the tip of the arm 212. In addition, the work machine 21 is provided with an angle detector 27 such as a potentiometer that detects the swing angle of the bucket 213. The operation of the work machine 21 is controlled by the work machine controller 25, and the work machine controller 25 is configured to be able to communicate with the overload prevention controller 5A.

The overload prevention controller 5A is configured as an overload prevention control means on the shovel 2 side in the overload prevention system 100, and the monitor panel 26 performs various displays according to instructions from the overload prevention controller 5A.
Note that the communication terminal 23 and the communication antenna 24 of the excavator 2 have the same configuration as the communication terminal 12 and the communication antenna 13 of the dump truck 1, and thus description thereof is omitted.

[1-2] Control Structure of Overload Prevention Controller 3A of Dump Truck 1 Next, a control structure of the overload prevention controller 3A on the dump truck 1 side in the overload prevention system 100 will be described with reference to FIG.
As shown in FIG. 2, the overload prevention controller 3A includes a receiving unit 31, a storage unit 32, a load amount detecting unit 33, a traveling state determining unit 34, a cooperative control state determining unit 35, a loading start determining unit 36, and transporter information. A transmission unit 37, a loader information reception determination unit 38, a loading state determination unit 39, a loading prohibition command transmission unit 40, and a prohibition release command transmission unit 41 are provided.

The receiving unit 31 is a part that receives information from the communication terminal 12 and receives information transmitted from the overload prevention controller 5 </ b> A of the excavator 2.
The storage unit 32 stores the communication address of the dump truck 1 and the maximum load amount of the dump truck 1. Further, the storage unit 32 stores identification information such as a calculated value in the control and the ID of the excavator 2 received by the receiving unit 31.

The load amount detection means 33 detects the amount of the load loaded on the transporter. That is, the load detection means 33 detects the load applied to the suspension damper 16 based on the detection signal of the pressure sensor 161 provided in the suspension damper 16, and the weight of the load loaded on the dump truck 1 from this load. Is detected.
Here, in the dump truck 1, by providing the pressure sensors 161 on the suspension dampers 16 of all the wheels, the load amount detection means 33 acts on each wheel even when the dump truck 1 is stopped on an inclined ground, for example. The weight of the load can be detected with high accuracy from the difference in the load being applied.

  The traveling state determination means 34 determines whether or not the dump truck 1 is in a traveling state based on the speed of the dump truck 1 and the rotational speed of the driven wheel. Specifically, the traveling state determination means 34 determines that the vehicle is in the stopped state when the speed of the dump truck 1 and the rotational speed of the driven wheel are zero or the minimum speed, and determines that the vehicle is in the traveling state otherwise. To do.

The cooperative control state determination unit 35 determines whether cooperative control for preventing overloading is being performed between the dump truck 1 and the excavator 2. That is, the cooperative control state determination unit 35 determines whether or not a cooperative control flag indicating that cooperative control is being performed is set.
The loading start determination unit 36 determines whether loading on the dump truck 1 has been started based on the detection value of the loading amount detection unit 33. Specifically, the loading start determination unit 36 determines that loading on the dump truck 1 has started when the detection amount of the loading amount detection unit 33 changes and becomes larger than the value up to that point.

The transporter information transmitting means 37 transmits information related to the transporter, that is, information such as an ID uniquely set for the dump truck 1 and a communication address of the dump truck 1. Then, the transporter information transmission unit 37 broadcasts the ID and communication address of the dump truck 1 immediately after the loading operation by the excavator 2 is started.
The loader information reception determination unit 38 determines whether or not the loader information is received from the loader. That is, the loader information reception determination unit 38 determines whether or not the excavator 2 ID has been received.

  The loading state determination unit 39 determines the loading state of the dump truck 1 from the amount of the load detected by the loading amount detection unit 33. Specifically, the loading state determination unit 39 determines whether or not the weight of the load detected by the loading amount detection unit 33 has reached a threshold value. As this threshold value, the maximum load amount stored in the storage unit 32 according to the ID of the dump truck 1 is used.

The loading prohibition command transmission means 40 is configured to output a loading prohibition instruction for prohibiting the loading operation of the loader when the loading state determination means 39 determines that the weight of the load has reached a threshold value. Send to 2
The prohibition cancel command transmission means 41 transmits a prohibition cancel command for canceling the prohibition state of the loading operation toward the shovel 2.
At this time, the loading prohibition command transmission unit 40 and the prohibition cancellation command transmission unit 41 designate the communication address of the excavator 2 and transmit the respective commands.

[1-3] Control Structure of Overload Prevention Controller 5A of Excavator 2 Next, a control structure of the overload prevention controller 5A on the shovel 2 side in the overload prevention system 100 will be described with reference to FIG.
As shown in FIG. 3, the overload prevention controller 5A includes a receiving means 51, a storage means 52, a prohibition release command determining means 53, a cooperative control state determining means 54, a target transporter determining means 55, and a loader information transmitting means 56. , Loading prohibition command determination means 57, warning command means 58, and work implement operation prohibiting means 59.

The receiving means 51 is a part that receives information from the communication terminal 23, and receives information transmitted from the overload prevention controller 3A on the dump truck 1 side.
The storage means 52 stores the communication address of the excavator 2 in the same manner as the storage means 32 in the dump truck 1. Further, the storage unit 52 stores identification information such as the calculated value in the control and the ID of the excavator 2 received by the receiving unit 51.

The prohibition cancellation command determination means 53 determines whether or not the loading prohibition state of the loader has been canceled. That is, the prohibition cancellation command determination unit 53 determines whether or not a prohibition cancellation command has been received from the dump truck 1.
The cooperative control state determination unit 54 prevents overloading between the dump truck 1 and the shovel 2 in accordance with the set state of the cooperative control flag, similarly to the cooperative control state determination unit 54 in the overload prevention controller 3A on the dump truck 1 side. It is determined whether or not cooperative control is implemented.

  The target transporter determination means 55 determines the transporter to be loaded based on the reception status of the ID from the transporter. Specifically, when the target transporter determination unit 55 receives an ID from the dump truck 1 immediately after dumping the bucket 213 and performing the loading operation, the dump truck 1 is a transport target transporter. Is determined. At this time, whether or not the bucket 213 has been dumped can be determined based on the detection angle of the angle detector 27.

The loader information transmission means 56 transmits information related to the loader. That is, the loader information transmission unit 56 transmits the ID of the shovel 2 toward the dump truck 1 when it is determined that the dump truck 1 having the received ID is a transporter to be loaded.
The loading prohibition command determination unit 57 determines whether or not a loading prohibition command has been received from the dump truck 1.

The work machine operation prohibiting unit 59 locks the operation of the work machine 21 of the loader according to the determination result of the loading prohibition command determination unit 57. In addition, the work machine operation prohibiting unit 59 releases the lock of the work machine 21 in accordance with the determination result of the prohibition release command determination unit 53. In other words, the work machine operation prohibiting unit 59 instructs the work machine controller 25 to prohibit the operation of the work machine 21 or a command to release the prohibited state of the operation of the work machine 21.
The warning command unit 58 performs a warning command and a command cancellation indicating a loading prohibition state according to the determination results of the loading prohibition command determination unit 57 and the prohibition release command determination unit 53. That is, the warning command means 58 instructs the monitor panel 26 to display a warning when a loading prohibition command is received from the dump truck 1, and displays the warning display on the monitor panel 26 when a prohibition release command is received. Command to cancel.

[1-4] Operation of Overloading Prevention Controller 3A of Dump Truck 1 Next, the operation of the overloading prevention controller 3A on the dump truck 1 side will be described based on the flowchart shown in FIG.
First, the overload prevention controller 3A acquires the measured values of sensors such as the wheel speed sensor 151 and the pressure sensor 161, and the receiving means 31 receives the information transmitted from the overload prevention controller 5A on the shovel 2 side as the communication terminal 12. (Step S11).

Next, the load amount detection means 33 detects the weight of the load loaded on the dump truck 1 based on the detection signal of the pressure sensor 161 provided in the suspension damper 16 (step S12).
Thereafter, the traveling state determination means 34 determines whether or not the dump truck 1 is in a traveling state based on the speed of the dump truck 1 and the rotational speed of the driven wheel (step S13).

When the traveling state determination unit 34 determines that the dump truck 1 is in the stopped state, the cooperative control state determination unit 35 has a cooperative control flag indicating that cooperative control is being performed between the dump truck 1 and the shovel 2. It is determined whether it is set (step S14).
When it is determined that the cooperative control flag is not set, the loading start determination unit 36 determines whether or not loading of the load on the dump truck 1 has been started based on the detection value of the loading amount detection unit 33. If it is determined (step S15) and it is determined that loading of the load on the dump truck 1 is started, the transporter information transmission unit 37 transmits the ID of the dump truck 1 (step S16). Further, the loader information reception determination means 38 determines whether or not the excavator 2 ID has been received (step S17). When the ID of the excavator 2 is received, the overload prevention controller 3A recognizes that the loader that performs the overload prevention cooperative control is specified, and sets the cooperative control flag (step S18). ). At this point, the mutual IDs are exchanged between the dump truck 1 and the excavator 2.

  After step S18, or when it is determined in step S14 that the cooperative control flag is set, the loading state determination unit 39 causes the weight of the load detected by the load amount detection unit 33 to reach the threshold value. It is determined whether or not (step S19). When it is determined that the weight of the load has reached the threshold value, the loading prohibition command transmission means 40 transmits a loading prohibition command for prohibiting further loading work to the shovel 2 (step). S20).

  On the other hand, when it is determined in step S13 that the dump truck 1 is in the traveling state, the cooperative control state determination unit 35 determines whether or not the cooperative control flag is set (step S21). When it is determined that the cooperative control flag is set, the prohibition release command transmission unit 41 transmits a prohibition release command for canceling the prohibited state of the loading operation to the shovel 2 (step S22). The overload prevention controller 3A resets the cooperative control flag (step S23).

[1-5] Operation of Overload Prevention Controller 5A of Excavator 2 Next, the operation of the overload prevention controller 5A on the shovel 2 side will be described based on the flowchart shown in FIG.
First, the overload prevention controller 5A acquires the measurement value of a sensor such as the angle detector 27, and the receiving means 51 receives the information transmitted from the overload prevention controller 3A of the dump truck 1 from the communication terminal 23 ( Step S31).

Next, the prohibition cancellation command determination means 53 determines whether or not a prohibition cancellation command for canceling the loading prohibition state of the excavator 2 has been received from the dump truck 1 (step S32).
When it is determined that the prohibition release command from the dump truck 1 has not been received, the cooperative control state determination unit 54 determines whether or not the cooperative control flag is set (step S33), and the cooperative control flag is set. If not, the target transporter determination unit 55 determines whether or not an ID is received from the dump truck 1 immediately after the loading operation is performed (step S34). When the ID is received from the dump truck 1, the loader information transmission means 56 transmits the ID of the excavator 2 toward the dump truck 1 (step S35), and the overload prevention controller 5A receives the cooperative control flag. Is set (step S36).

  After step S36 or when it is determined in step S33 that the cooperative control flag is set, the loading prohibition command determination unit 57 determines whether or not a loading prohibition command is received from the dump truck 1 ( Step S37). When the loading prohibition instruction is received from the dump truck 1, the warning instruction means 58 instructs the monitor panel 26 to display a warning (step S38), and the work implement operation prohibiting means 59 sends the work implement controller 25 to the work implement controller 25. The operation of the work machine 21 of the excavator 2 is locked via the command (step S39).

  On the other hand, when it is determined in step S32 that the prohibition release command has been received from the dump truck 1, the overload prevention controller 5A resets the cooperative control flag (step S40). Then, the work implement operation prohibiting means 59 unlocks the operation of the work implement 21 (step S41), and the warning command means 58 gives a command to release the warning display on the monitor panel 26 (step S42).

According to the overload prevention system 100 configured as described above, the dump truck 1 transmits a loading prohibition instruction to the shovel 2 based on the load amount of the load detected on the dump truck 1 side. Then, the operation of the work machine 21 is locked according to the loading prohibition command. According to this, since the operation of the work machine 21 is prohibited using the weight of the load detected by the dump truck 1, overloading on the dump truck 1 can be prevented with high accuracy. Further, since the prohibition of the operation of the work machine 21 is canceled after the dump truck 1 has traveled and cannot be loaded, the operator cannot perform further loading. Furthermore, since a warning is displayed on the monitor panel 26, the operator can recognize that the load amount of the load has reached the maximum load amount, and can be urged not to load further. Therefore, overloading on the dump truck 1 can be reliably prevented.
In addition, when locking the operation of the work machine 21, a warning display on the monitor panel 26 is also performed, so that when the work machine 21 is locked and cannot move, it is mistaken that the work machine has failed. Can be prevented.

[Second Embodiment]
Next, a second embodiment of the present invention will be described based on FIGS.
In the first embodiment described above, it is determined whether or not the weight of the load has reached the maximum load on the dump truck 1 side, and if it is determined that the maximum load has been reached, the excavator 2 is operated. The operation prohibition command for the machine 21 was transmitted.
In contrast, in the second embodiment, the weight of the load is transmitted from the dump truck 1 to the excavator 2, and it is determined whether or not the weight of the load has reached the maximum load on the shovel 2 side. 21 is different in that the operation prohibition and the operation prohibition are canceled.

In the present embodiment, the overload prevention controller 3B of the dump truck 1 includes a receiving unit 31, a storage unit 32, a load amount detecting unit 33, a traveling state determining unit 34, a cooperative control state determining unit 35, as shown in FIG. Loading start determination means 36, transporter information transmission means 37, loader information reception determination means 38, and prohibition release command transmission means 41 are provided. That is, the overload prevention controller 3B does not include a load state determination unit. Further, the transporter information transmission unit 37 transmits the ID of the dump truck 1, the maximum load amount, and the weight of the load.
Other configurations in the overload prevention controller 3B are the same as those in the first embodiment described above, and a description thereof is omitted.

  On the other hand, as shown in FIG. 7, the configuration of the overload prevention controller 5B on the shovel 2 side includes a receiving means 51, a storage means 52, a prohibition release command determining means 53, a cooperative control state determining means 54, and a target transporter determining means 55. , A loader information transmission unit 56, a warning command unit 58, a work machine operation prohibition unit 59, and a loading state determination unit 60. Then, the loading state determination unit 60 determines the loading state of the dump truck 1 based on the weight of the load and the maximum loading amount transmitted from the overload prevention controller 3B of the dump truck 1, and the work machine operation prohibiting unit 59. Locks the operation of the work implement 21 via a command to the work implement controller 25 when it is determined that the weight of the load has reached the maximum load capacity that is a threshold value.

Next, the operation of the overload prevention controller 3B on the dump truck 1 side will be described based on the flowchart shown in FIG.
First, steps S51 to S55 are the same as steps S11 to S15 in the first embodiment, and thus description thereof is omitted.

  When it is determined in step S55 that the loading on the dump truck 1 is started, the transporter information transmission unit 37 transmits the ID and the maximum loading amount of the dump truck 1 (step S56). Then, the loader information reception determination means 38 determines whether or not the excavator 2 ID has been received (step S57). If it is determined that the excavator 2 ID has been received, the overload prevention controller 3B A cooperative control flag is set (step S58).

  After step S58 or when it is determined in step S54 that the cooperative control flag is set, the transporter information transmission unit 37 transmits the detected weight of the load to the excavator 2 (step S59).

  On the other hand, when it is determined in step S53 that the dump truck 1 is in the traveling state, the overload prevention controller 3B performs the same processing as in steps S21 to S23 of the first embodiment. That is, the cooperative control state determination unit 35 determines whether or not the cooperative control flag is set (step S60). When it is determined that the cooperative control flag is set, the prohibition release command transmission unit 41 transmits a prohibition release command for loading work to the shovel 2 (step S61), and the overload prevention controller 3B. Resets the cooperative control flag (step S62).

Next, the operation of the overload prevention controller 5B on the shovel 2 side will be described based on the flowchart shown in FIG.
First, steps S71 to S76 are the same as steps S31 to S36 in the first embodiment, and thus the description thereof is omitted.

  After step S76, or when it is determined in step S73 that the cooperative control flag is set, the loading state determination unit 60 includes the weight of the load transmitted from the overload prevention controller 3B of the dump truck 1, The loading state of the dump truck 1 is determined by comparing the maximum loading amount which is a determination threshold value (step S77). When it is determined that the weight of the load has reached the threshold value, the warning instruction means 58 instructs the monitor panel 26 to display a warning (step S78), and the work implement operation prohibiting means 59 is provided on the work implement 21. The operation is locked (step S79).

  On the other hand, when it is determined in step S72 that the prohibition cancel command has been received from the dump truck 1, the overload prevention controller 5B resets the cooperative control flag (step S80). Then, the work implement operation prohibiting means 59 unlocks the operation of the work implement 21 (step S81), and the warning command means 58 gives a command to release the warning display on the monitor panel 26 (step S82).

  The overload prevention system 100 having the above-described configuration can achieve the same effects as those of the first embodiment described above.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each of the above-described embodiments, the transporter information transmission unit 37 of the dump truck 1 transmits the ID of the dump truck 1, and the loader information transmission unit 56 of the excavator 2 transmits the ID of the excavator 2, respectively. For example, the IDs of the communication terminals 12 and 23 mounted on the dump truck 1 and the excavator 2 may be transmitted.

In each of the embodiments described above, it is determined whether or not the operation of the work implement 21 is prohibited based on the weight of the load. However, the present invention is not limited to this. For example, based on the detection value of the pressure sensor 161, the work implement 21 21 may be determined to prohibit the operation. In this case, by storing a pressure value corresponding to the maximum load capacity of the dump truck 1 in the storage unit 32, this stored value can be used as a determination threshold value.
Further, based on the lighting state of the load amount display lamp provided in the dump truck 1, it may be determined whether or not the operation of the work machine 21 is prohibited. In this case, it is desirable to set the display stage of the load amount display lamp as finely as possible.

  In each of the above embodiments, the weight of the load is detected based on the detection value of the pressure sensor 161 provided in the suspension damper 16. However, the present invention is not limited to this. For example, a load sensor is provided in the dump truck 1 and the load is detected. You may detect the weight of a load based on the output signal of a sensor. Alternatively, the loading state of the load in the vessel 11 may be photographed, and the amount of the load may be detected based on the image processing.

  In each of the embodiments described above, the transporter information transmitting means 37 broadcasts the ID of the dump truck 1 in the overload prevention controllers 3A and 3B of the dump truck 1, and the target transport is performed in the overload prevention controllers 5A and 5B of the excavator 2. Although the machine determination means 55 determined that the dump truck 1 that received the ID immediately after the loading operation is a loading target transporter, the present invention is not limited to this. For example, the dump truck 1 and the excavator 2 may be provided with GPS antennas so that their positions can be recognized, and the nearest transporter or loader may be recognized as a partner for cooperative control for preventing overloading. .

  In each of the embodiments described above, the warning command means 58 commands the monitor panel 26 to display a warning or cancel the warning display, and the monitor panel 26 displays a warning. However, the present invention is not limited to this. May be performed.

  INDUSTRIAL APPLICABILITY The present invention can be applied not only to construction machines but also to any overload prevention system that prevents overloading of a transporter by a loader.

The schematic diagram which shows the structure of the overloading prevention system which concerns on 1st Embodiment of this invention. The control block diagram of the overload prevention controller by the side of the conveying machine which concerns on the said 1st Embodiment. The control block diagram of the overloading prevention controller by the side of the loader which concerns on the said 1st Embodiment. The flowchart which shows the overload prevention control by the side of the conveying machine of the said 1st Embodiment. The flowchart which shows the overload prevention control by the side of the loader of the said 1st Embodiment. The control block diagram of the overload prevention controller by the side of the conveying machine which concerns on 2nd Embodiment of this invention. The control block diagram of the overload prevention controller by the side of the loader which concerns on the said 2nd Embodiment. The flowchart which shows the overload prevention control by the side of the conveying machine of the said 2nd Embodiment. The flowchart which shows the overload prevention control by the side of the loader of the said 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Dump truck (transporter), 2 ... Excavator (loader), 21 ... Work machine, 33 ... Loading amount detection means, 34 ... Traveling state determination means, 39 ... Loading state determination means, 40 ... Loading prohibition command Transmission means, 41... Prohibition release command transmission means, 51... Reception means, 59... Work machine operation prohibition means, 100.

Claims (5)

An overload prevention system for preventing overloading on a transporter by a loader,
The transporter is
A load detection means for detecting the load of the transporter;
Traveling state determination means for determining whether or not the transporter is in a traveling state;
A loading state determination means for determining whether or not the loading amount of the transporter has reached a predetermined value;
When the loading state determination means determines that the loading amount of the transporter has reached a predetermined value, a loading prohibiting instruction for prohibiting the loading operation of the loading machine is transmitted to the loading machine. Insertion prohibition command transmission means,
A prohibition release command transmitting means for transmitting a prohibition release command for canceling the loading prohibition command to the loader when the traveling state determination means determines that the transporter is in a traveling state;
The loader is
A working machine for performing the loading work of the load;
Receiving means for receiving the loading prohibition instruction and the prohibition release instruction;
A work machine operation prohibiting means for prohibiting the operation of the work machine when receiving the loading prohibition command and releasing the prohibition of the operation of the work machine when receiving the prohibition release command. Features an overload prevention system. An overload prevention system for preventing overloading on a transporter by a loader,
The transporter is
A load detection means for detecting the load of the transporter;
Transporter information transmitting means for transmitting the load amount of the transporter detected by the load amount detecting means to the loader;
Traveling state determination means for determining whether or not the transporter is in a traveling state;
A prohibition release command transmitting means for transmitting a prohibition release command for canceling the loading prohibition command to the loader when the traveling state determination means determines that the transporter is in a traveling state;
The loader is
A working machine for performing the loading work of the load;
Receiving means for receiving the prohibition release command;
A loading state determination means for determining whether or not the loading amount of the transporter has reached a predetermined value;
When the loading state determination means determines that the load amount of the transporter has reached a predetermined value, the operation of the work machine is prohibited, and the operation of the work machine is prohibited when the prohibition release command is received. An overload prevention system comprising a work machine operation prohibiting means for releasing In the overload prevention system according to claim 1 or 2,
The load detection means detects the weight of the load loaded on the transporter,
The overload prevention system, wherein the loading state determination unit determines whether the weight of the load of the transporter has reached a predetermined value. An overload prevention method for preventing overloading on a transporter by a loader,
In the transporter,
Detecting the load of the transporter;
Determining whether the transporter is in a running state;
Determining whether the load of the transporter has reached a predetermined value;
A step of transmitting to the loader a loading prohibition command for prohibiting the loading operation of the loader when it is determined by the loading state determination means that the load amount of the transporter has reached a predetermined value; When,
When the traveling state determination means determines that the transporter is in a traveling state, the vehicle includes a step of transmitting a prohibition release command for canceling the loading prohibition command to the loader,
In the loader,
Receiving the loading prohibition command and the prohibition release command;
When receiving the loading prohibition command, the operation of the work machine that performs the loading work of the load is prohibited, and when the prohibition release command is received, the prohibition of the operation of the work machine is canceled. And a method for preventing overloading. An overload prevention method for preventing overloading on a transporter by a loader,
In the transporter,
Detecting the load of the transporter;
Transmitting the load amount of the transporter detected by the load amount detection means to the loader;
Determining whether the transporter is in a running state;
When the traveling state determination means determines that the transporter is in a traveling state, the vehicle includes a step of transmitting a prohibition release command for canceling the loading prohibition command to the loader,
In the loader,
Receiving the prohibition release command;
A loading state determination means for determining whether or not the loading amount of the transporter has reached a predetermined value;
When the loading state determination means determines that the load amount of the transporter has reached a predetermined value, the operation of the work machine that performs the loading work of the load is prohibited, and the prohibition release command is received. And a step of canceling the prohibition of the operation of the work machine.

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