JP4559815B2 - Construction machine alarm device - Google Patents

Description

  The present invention relates to an alarm device for a construction machine that notifies an abnormality occurrence state or the like due to an operation of a safety device by an alarm sound.

  In general, a construction machine such as a crane is equipped with a safety device such as an overload prevention device or an overwinding prevention device. For example, Patent Document 1 discloses a device that sounds a buzzer to notify an operator of the occurrence of an abnormality when an overload prevention device is activated.

JP-A-10-218571

  However, when a plurality of safety devices are operated, if a buzzer sound corresponding to the operation of each safety device sounds simultaneously, the worker cannot easily recognize which safety device is operating.

The construction machine alarm device according to the present invention includes a setting means for setting a plurality of types of alarm sounds, an alarm output means for outputting an alarm sound, and a plurality of setting means, each according to an input alarm generation factor. When the alarm sound is set, the alarm control means controls the alarm output means so as to sequentially output the set alarm sounds separately, and the alarm control means has a number of types preset in the setting means. When more than 2 types of alarm sounds are set, according to the priority of the types of alarm sounds, a preset number of types of alarm sounds are alternated from the types of alarm sounds with higher priority. The alarm output means is controlled so as not to output a type of alarm sound having a low priority level exceeding the preset number of types .

According to the present invention, when an alarm sound is set according to an input alarm generation factor, and the number of types of the set alarm sound exceeds a preset number of types, the priority order of the alarm sound types In accordance with the above, a preset number of types of alarm sounds are alternately and repeatedly output from a type of alarm with a high priority, and a type of alarm sound with a low priority exceeding the number of preset types is not output. Therefore, the number of types of alarm sounds output from the alarm output means can be reduced , and the worker can easily recognize which safety device is operating.

Hereinafter, an embodiment of an alarm device for a construction machine according to the present invention will be described with reference to FIGS.
FIG. 1 is a side view of a tower crane provided with an alarm device according to the present embodiment. The tower crane includes a traveling body 1, a swiveling body 2 that is turnably provided on the traveling body 1, a tower boom (hereinafter referred to as a tower) 3 that is pivotally supported by the revolving body 2 as a front device, And a jib 4 that is pivotally supported at the tip of the tower 3.

  The revolving unit 2 is equipped with a hoisting drum 5, a tower hoisting drum 6, and a jib hoisting drum 7. A hoisting rope 5a is wound around the hoisting drum 5, and the hoisting rope 5a is connected to a hook 8 via a jib tip. A tower hoisting rope 6a is wound around the tower hoisting drum 6, and the tower hoisting rope 6a is connected to the tip of the tower via a pendant rope 6b. A jib hoisting rope 7a is wound around the jib hoisting drum 7, and the jib hoisting rope 7a is connected to the tip of the jib via a pendant rope 7b, a swing lever 9, and a pendant rope 7c. The hook 8 is raised and lowered by driving the hoisting drum 5, the tower 3 is raised and lowered by driving the tower raising and lowering drum 6, and the jib 4 is raised and lowered by driving the jib raising and lowering drum 7.

  The tower crane is provided with safety devices such as an overload prevention device, a tower overwinding prevention device, a jib overwinding prevention device, a hook overwinding prevention device, and a work range limiting device. Drive is limited.

  The overload prevention device (also referred to as a moment limiter) calculates a load acting on the jib 4 due to the rope tension of the jib hoisting rope 7a, etc., and when this load exceeds a predetermined limit value corresponding to the working radius, the tower 3 And the raising / lowering operation | movement (operation | movement which increases load) of the jib 4 is stopped, and this prevents the crane from falling.

  When the tower overwinding prevention device detects that the tower angle has reached a predetermined limit value by the operation of a limit switch provided at the tower base end portion, for example, the tower 3 rolls up and down so as to exceed the limit value. Is. When the jib overwinding prevention device detects that the jib angle has reached a predetermined limit value by operating a limit switch provided at the base end of the jib, for example, it stops the undulation operation of the jib 4 exceeding the limit value. Is.

  The hook overwinding prevention device stops the hoisting operation of the hook 8 when detecting that the distance between the hook 8 and the jib tip has reached a predetermined limit value by the operation of a limit switch provided above the hook 8, for example. Is. The work range limiting device limits the operation of the front device that exceeds the limit value when it is detected that the work range (work radius or work height) has reached a predetermined limit value.

  These safety devices not only limit the driving of the drums 5 to 7 but also detect various alarm factors as shown in FIG. The alarm factor is constant in the condition that satisfies the operating conditions of the safety device (safety device operating conditions such as overload, tower overwinding, jib overwinding, hook overwinding, working range limitation, etc. in the figure) and safety device operating conditions State approaching above (warning state such as overload forecast, tower overwind forecast, jib overwind forecast, hook overwind forecast, work range limit forecast in the figure), safety operation not performed (forget to brake) Inadequate operation). In addition, the front determination abnormality in the figure means that the attachment signal is abnormal or the setting state of the overload prevention device when determining which attachment is attached as a front device with the connection signal incorporated in the wiring. It means an inconsistent state.

  FIG. 2 is a block diagram showing a configuration of the alarm device according to the present embodiment. The alarm factor 10 detected by the safety device is input to the controller 20. The controller 20 executes processing to be described later based on this input signal, and outputs a control signal to the alarm generation device 30. The alarm generator 30 is an apparatus that alternatively generates four types of alarm sounds (buzzer A to buzzer D) having different timbres from speakers provided in the cab.

  Here, the buzzer A is the safety device operating state with automatic undulation system stop, the buzzer B is the safety device operating state with the hoisting system automatic stop, the buzzer C is inoperable, and the buzzer D is the safety device operating. It is set as a sound for notifying the previous warning state. The worker performs the work after grasping in advance which state buzzer A to buzzer D corresponds to.

  FIG. 4 is a flowchart showing an example of processing in the controller 20. First, the alarm factor 10 detected by the safety device in step S1 is read. In step S2, an alarm sound (buzzer A to buzzer D) corresponding to the alarm factor 10 is set using the relationship shown in FIG. 3 in advance, and the alarm sound setting is canceled when the alarm factor 10 is not detected. In step S3, it is determined whether or not at least one of buzzer A to buzzer D is set. If the determination is affirmative, the process proceeds to step S4. If the determination is negative, the process proceeds to step S8. In step S8, the output of the buzzer from the alarm generator 30 is stopped.

  In step S4, the type of the set buzzer sound is determined. If it is determined that one type of buzzer sound is set, the process proceeds to step S5, and the set buzzer sound is output from the alarm generating device 30. For example, if only buzzer A is set in step S2, only buzzer A is output in step S5. If only buzzer B is set, only buzzer B is output.

  If it is determined in step S4 that two types of buzzer sounds are set, the process proceeds to step S6, and the set buzzer sounds are alternately output. In this case, priorities are assigned to the buzzers A to D in advance in the order of buzzer A> buzzer B> buzzer C> buzzer D, and the set buzzers are alternately and repeatedly output according to the priority order. For example, if buzzer A and buzzer C are set in step S2, buzzer A is output for a predetermined time t1, then buzzer C is output for a predetermined time t2, and this is repeated. In this case, the predetermined times t1 and t2 may be equal (t1 = t2), or the predetermined time with a higher priority may be set longer (t1> t2).

  If it is determined in step S4 that three or more types of buzzer sounds are set, the process proceeds to step S7, where two buzzer sounds with high priority are selected, and they are alternately and repeatedly output. For example, when all buzzers A to D are set in step S2, buzzer A is output for a predetermined time t1, and then buzzer B is output for a predetermined time t2. When buzzer A, buzzer C, and buzzer D are set in step S2, buzzer A is output for a predetermined time t1, and then buzzer C is output for a predetermined time t2.

Next, the operation of the alarm device according to the present embodiment will be described by taking the operation of the hook overwinding prevention device and the tower overwinding prevention device as an example.
When the tower hoisting drum 6 is driven to wind up by operating the operation lever, the tower 3 rotates upward, and the tower angle approaches the operating angle of the tower overwinding prevention device. Further, when the hoisting drum 5 is driven to wind by operating the operation lever, the hook 8 rises and the hook 8 approaches the operating position of the hook overwinding prevention device. Here, when the tower angle approaches the operating angle of the tower overwinding prevention device by a predetermined value or more, the tower overwinding forecast (FIG. 3) is input to the controller 20 as the alarm factor 10, and the buzzer D is set (step S2). ). Then, as shown at time T1 in FIG. 5, the buzzer D is continuously output from the alarm generating device 30 (step S5). As a result, the operator recognizes that the tower angle is approaching the operating state of the safety device, and operates the operation lever while paying attention to the tower angle.

  In this state, when the hook 8 further approaches the operating position of the hook overwinding prevention device by a predetermined value or more, a hook overwinding forecast is input to the controller 20 as the alarm factor 10 (time point T2). In this case, since the buzzer D has already been set at time T1, the output from the alarm generation device 30 does not change.

  When the hook 8 is further raised and the hook overwinding prevention device is activated, the hoisting operation of the hook 8 is stopped. Then, the hook overwinding is input to the controller 20 as the alarm factor 10, and the buzzer B is newly set (time T3). In this case, the buzzer B has a higher priority than the buzzer D, and the alarm generator 30 repeatedly outputs the buzzer B and the buzzer D alternately. That is, after buzzer B is output for a predetermined time t1, buzzer D is output for a predetermined time t2, and this is repeated. As a result, the worker can recognize that the hook overwinding prevention device has been activated.

  Subsequently, when the tower 3 is rotated upward and the tower overwinding prevention device is activated, the standing operation of the tower 3 is stopped. And the tower overwinding is input to the controller 20 as the alarm factor 10, and the buzzer A is newly set (time T4). In this case, the priority order is buzzer A> buzzer B> buzzer D, and the alarm generator 30 repeatedly outputs buzzer A and buzzer B with high priority. That is, after buzzer A is output for a predetermined time t1, buzzer B is output for a predetermined time t2, and this is repeated. As a result, the worker can recognize that the tower overwinding prevention device and the hook overwinding prevention device are activated simultaneously.

  Next, when the tower 3 is rotated downward, the tower overwinding prevention device is released, the buzzer B and the buzzer D are set in the controller 20 (time point T5), and the buzzer B and the buzzer D are alternately switched from the alarm generating device 30. Output repeatedly. Thereby, the worker can recognize that the tower overwinding prevention device has been released.

  When the hook 8 is further lowered, the hook overwinding prevention device is released, only the buzzer D is set in the controller 20 (time T6), and only the buzzer D is continuously output from the alarm generating device 30. Thereby, the worker can recognize that the hook overwinding prevention device has been released.

  When the hook 8 moves away from the operating position of the hook overwinding prevention device by a predetermined value or more, only the tower overwinding forecast is input to the controller as the alarm factor 10 (time T7). In this case, the output from the alarm generator 30 does not change, and the buzzer D is output from the alarm generator 30.

  Next, the tower 3 is rotated downward, and when the tower angle becomes smaller than the operating angle of the tower overwinding prevention device by a predetermined value or more, the setting of the buzzer A to the buzzer D is canceled and the buzzer stops (step S8). Thus, the worker can recognize that both the hook position and the tower angle are out of the warning state and are in the normal state.

According to the above embodiment, the following effects can be obtained.
(1) When a single alarm factor 10 is input, only the buzzer A to buzzer D corresponding to the alarm factor 10 is output from the alarm generator 30 (step S5), and when a plurality of alarm factors 10 are input. Two of the buzzers A to D corresponding to the alarm factor 10 are alternately output repeatedly (steps S6 and S7). As a result, the worker can easily recognize on which alarm factor 10 the alarm device is operating. As a result, the worker can accurately grasp the operating state of the safety device, and can appropriately cope with the operation of the safety device. In this regard, when a plurality of alarm factors 10 are input, if a buzzer sound corresponding to each alarm factor 10 is simultaneously output, it is difficult to recognize what alarm factor 10 is input.

(2) Alarm factor 10 is classified into four groups: a state with an automatic stop of the undulation system, a state with an automatic stop of the hoisting system, an inadequate operation state, and a warning state. Since it is set, it is not necessary to set the same number of buzzer sounds as the alarm factor 10, and the configuration can be simplified.
(3) Since there are only four types of buzzer sounds Buzzer A to Buzzer D, the worker can easily recognize the operating state of the safety device.
(4) Priorities are assigned to buzzer A to buzzer D in the order of buzzer A> buzzer B> buzzer C> buzzer D, and when multiple buzzer sounds are set, two of the higher priority are selected and output. Therefore, the worker can immediately grasp the automatic stop state (buzzer A, buzzer B) due to the operation of the safety device, and can respond quickly.
(5) Since the buzzer D is output when the warning state before the safety device is activated, and the buzzer A or B is output when the safety device is activated, it can be easily recognized that the state has shifted from the warning state to the safety device operation state. .

  In the above embodiment, the buzzer sound is output by the operation of the alarm device. However, the alarm content may be displayed on the monitor of the cab together with this. Thereby, the worker can confirm the correspondence (FIG. 3) between the buzzer sound and the alarm factor 10, and can prevent the alarm factor 10 from being recognized erroneously.

  The safety device shown in the above embodiment is merely an example, and the present invention can be similarly applied to construction machines having other safety devices. Therefore, an alarm generation factor other than that shown in FIG. 3 may be input. When a plurality of alarm factors 10 are input, two buzzer sounds are alternately output repeatedly. However, the controller 20 as an alarm control means outputs an alarm generating device so as to output at least a plurality of buzzer sounds separately separately. If 30 is controlled, the alarm generation pattern is not limited to that described above.

  In the above embodiment, the alarm sound is output as a buzzer sound, but may be output as a sound. In this case, a word indicating the alarm factor 10 may be output by voice. Although any one of the buzzer A to the buzzer D is output by the alarm generation device 30, four buzzers having different timbres may be separately attached and these buzzers may be controlled by the controller 20. That is, the configuration of the alarm output means is not limited to that described above.

  The alarm factor 10 is classified into a smaller number of groups, and a buzzer sound is set for each group (step S2). However, when the number of alarm factors 10 is small, it is not necessary to classify the alarm factor 10 into groups. An alarm sound may be set. Although a smaller number of buzzer sounds than the set buzzer sounds are selected and output (step S7), the number of buzzer sounds to be selected is not limited to two and may be three or more.

  Although the tower crane has been described as an example in the above embodiment, the present invention can be applied to other construction machines. That is, the present invention is not limited to the alarm device according to the embodiment as long as the features and functions of the present invention can be realized.

The side view of the tower crane provided with the alarm device which concerns on embodiment of this invention. The block diagram which shows the structure of the alarm device which concerns on embodiment of this invention. The figure which shows various alarm factors and the buzzer sound corresponding to it. The flowchart which shows an example of the process in the controller of FIG. The timing chart which shows an example of operation | movement of the alarm device which concerns on embodiment of this invention.

Explanation of symbols

10 Alarm factor 20 Controller 30 Alarm generator

Claims (3)

Each of the setting means for setting a plurality of types of alarm sounds according to the input alarm generation factor,
An alarm output means for outputting an alarm sound;
When a plurality of alarm sounds are set by the setting means, the alarm control means for controlling the alarm output means to sequentially output the set alarm sounds separately ,
When the number of types of alarm sounds exceeding the number of types preset in the setting unit (two or more) is set, the alarm control unit has a high priority according to the priority of the types of alarm sounds. The alarm output means is configured to alternately output a predetermined number of types of alarm sounds from the types of alarm sounds, and not to output a low-priority type alarm sound that exceeds the preset number of types. An alarm device for a construction machine characterized by controlling . The alarm device for a construction machine according to claim 1,
An alarm device for a construction machine, wherein the setting means sets an alarm sound for each group in which input alarm generation factors are classified into a smaller number. The construction machine alarm device according to claim 1 or 2,
A warning device for a construction machine, wherein the warning control means controls the warning output means so as not to output the released type of warning sound when the warning sound set in the setting means is released .

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