JP4841877B2 - Self-propelled crane - Google Patents

Description

  The present invention relates to a self-propelled crane, and more particularly, to a technique for monitoring a grounding state of an outrigger.

Conventionally, a traveling crane that travels on a crawler or the like is provided with a plurality of outriggers in order to ensure stability during operation. Also, if the outrigger is not completely grounded at the start of crane work or at the time of crane work, for example, the ground reaction force applied to the outrigger may be detected by a sensor, and a predetermined calculation may be performed on the detection result. Thus, it has been proposed to monitor whether or not all outriggers are completely grounded (see, for example, Patent Document 1).
JP 2004-307188 A

  However, in order to detect the ground reaction force applied to the outrigger with the sensor, it is necessary to use an expensive sensor, and it is impossible to detect whether or not the outrigger is completely grounded unless the result is calculated. There is a problem.

  In view of the above problems, an object of the present invention is to provide a self-propelled crane including a monitoring device that can monitor the state of an outrigger reliably and inexpensively.

In order to solve the above-described problems, in the present invention, in a self-propelled crane having a traveling body, a plurality of outriggers that can be bent while projecting from the traveling body side, and an outrigger monitoring device that monitors a grounding state of the outriggers. ,
Each of the plurality of outriggers includes a grounding member that rotates around a horizontal axis at the tip of the outrigger main body and switches the attitude with respect to the outrigger main body at the time of grounding,
The outrigger monitoring device includes a detector that detects whether the grounding member is in a position of a grounding posture rotated around the horizontal axis or a position of a non-grounding posture in each of the plurality of outriggers. When it is determined that the grounding member is not grounded in any one of the plurality of outriggers based on the detection result of the device, a warning signal to that effect is output.

  In the present invention, the detector detects whether the grounding member is in the grounding posture or the non-grounding posture in each outrigger before starting the crane work or during the crane work, and in any one outrigger, Is in a non-grounding posture, the outrigger monitoring device outputs a warning signal. For this reason, it is possible to notify the operator of the fact and also to forcibly stop the crane work. Further, since it is only necessary to detect whether the grounding member is in the grounding posture or the non-grounding posture in order to monitor the state of the outrigger, it is not necessary to detect the ground reaction force applied to the outrigger with an expensive sensor. Therefore, the outrigger monitoring device can be configured at low cost, and the state of the outrigger can be reliably detected.

In the self-propelled crane of the present invention , in addition to the above-described configuration, the grounding member is supported by the horizontal shaft attached to the tip of the outrigger and is rotatable around the horizontal axis, and the connection plate together is supported by a support shaft attached to the plate and a swingable ground plate to the support axis, the connecting plate, said ground attitude in contact with the front end surface of the outriggers, the tip The detector is rotatable about the horizontal axis between the non-contacting posture away from the surface, and the detector includes a limit switch disposed on the outrigger body side, and the connecting plate on the outrigger body side. A movable member that is displaced when switching from the non-grounding posture to the grounding posture and actuates the limit switch, and the movable member is elastically moved to a position where the limit switch is not actuated. Characterized in that a biasing member for holding me. According to this configuration, the detector is extremely inexpensive, and the state of the outrigger can be reliably detected.

  In the present invention, the outrigger monitoring device is in a non-grounded state when an output that the grounding member is in the non-grounding posture is output from the detector for a predetermined time or more during crane operation. It is preferable to judge that. With this configuration, even if the grounding member is lifted for a moment due to an impact or the like during the crane work, it is not determined as abnormal if it is lifted for such a short time, so that the crane work can be prevented from being interrupted unnecessarily. it can.

  In the present invention, it is preferable that the crane work is emergency-stopped when the warning signal is output from the outrigger monitoring device during the crane work.

  In the present invention, it is preferable that the detector detects that the grounding member is in the non-grounding posture when the grounding member floats by a predetermined dimension or more from the grounded state. If comprised in this way, even if a grounding member lifts slightly, since it will not determine with abnormality if such a slight lift is made, it can prevent that a crane operation | work is interrupted uselessly.

  In the present invention, the detector detects whether the grounding member is in the grounding posture or the non-grounding posture in each outrigger before starting the crane work or during the crane work, and in any one outrigger, Is in a non-grounding posture, the outrigger monitoring device outputs a warning signal. For this reason, the operator can be informed of this, and the crane work can be forcibly stopped. Further, since it is only necessary to detect whether the grounding member is in the grounding posture or the non-grounding posture in order to monitor the state of the outrigger, it is not necessary to detect the ground reaction force applied to the outrigger with an expensive sensor. Therefore, the outrigger monitoring device can be configured at low cost, and the state of the outrigger can be reliably detected.

(overall structure)
FIG. 1 is a side view of a self-propelled crane to which the present invention is applied. FIG. 2 is a perspective view of the self-propelled crane shown in FIG. 1 with the outriggers protruding. 3 (a) and 3 (b) are a plan view and a vertical view of the distal end portion of the outrigger of the self-propelled crane shown in FIG. FIGS. 4A, 4B, and 4C are explanatory diagrams of a state where the outrigger of the self-propelled crane shown in FIG. 1 is free, a state where detection of grounding is started, and a grounding state.

A self-propelled crane 1 shown in FIGS. 1 and 2 includes a crawler-type traveling body 3, and a boom 4 that can turn, undulate, and extend and retract is attached to a frame 30 of the traveling body 3. Further, the frame 30, left and right pair, is outriggers 5 of total four are provided on the front and rear ends. The outrigger main body 50 of each of the four outriggers 5 includes an attachment member 52 connected to the frame 30 via a rotation shaft 51, and a proximal end arm that is supported by the attachment shaft 52 by the undulation shaft 14. 53, an intermediate arm 54 that is supported by a base shaft 53 so as to be raised and lowered, and a distal arm 55 that is slidably fitted into the intermediate arm 54. Each of the four outriggers 5 includes a grounding member 59 that is swingably held at the distal end of the distal end arm 55, and an outrigger cylinder 58 that is provided between the attachment member 52 and the proximal end arm 53. The outrigger cylinder 58 can raise and lower the proximal arm 53.

  In any of the four outriggers 5 configured as described above, on the distal end side of the distal arm 55, as shown in FIGS. 3 (a) and 3 (b), the outer trigger body rotates around the horizontal axis 590 when grounded. A grounding member 59 for switching the attitude with respect to is attached. The grounding member 59 is supported by a connecting plate 56 supported by a horizontal shaft 590 and swingable by a support shaft 570 with respect to the connecting plate 56. And a ground plate 57.

Therefore, as shown in FIG. 4A, in the state where the grounding plate 57 floats from the ground, the grounding member 59 rotates around the horizontal axis 590 by its own weight, and has a non-grounding posture inclined forward. Become. In this state, the rear end portion 560 of the connecting plate 56 is in a state of being separated from the front end surface of the front end arm 55.

On the other hand, as shown in FIG. 4C, in the ground contact state where the ground plate 57 is in contact with the ground, the ground member 59 is pushed by the ground and rotates in the reverse direction around the horizontal axis 590 to be connected. The rear end portion 560 of the plate 56 is in contact with the front end surface 550 of the arm.

(Configuration of outrigger monitoring device)
In the self-propelled crane 1 configured in this manner, an outrigger monitoring device described below is configured in a control unit (not shown) of the traveling body 3, and the grounding of the outrigger 5 is performed before and during the crane operation. Monitor conditions and prevent falls.

  In this embodiment, when configuring the outrigger monitoring device, in each of the four outriggers 5, a detector that detects whether the grounding plate 57 is in a grounding posture or a non-grounding posture at the tip of the tip arm 55. 8 is configured, and the outrigger monitoring apparatus determines that the grounding plate 57 is in the non-grounded state in any one of the four outriggers 5 based on the detection results of these detectors 8. A warning signal to that effect is output.

  In this embodiment, when the detector 8 is configured, the limit switch 81 disposed inside the distal arm 55 and the axial direction when the grounding member 59 switches from the non-grounding posture to the grounding posture inside the distal arm 55. An urging member is provided with a shaft-like movable member 83 that is displaced to activate the limit switch 81, and an urging member 82 that is a coil spring that elastically holds the movable member 83 at a position where the limit switch 81 is not activated. An intermediate portion of 82 and the movable member 83 is disposed in the case 84. Since the middle portion of the movable member 83 is a cylinder portion 830 that slides in the case 84, a nipple 85 for injecting grease into the case 84 is formed in the distal end arm 55.

  Here, the movable member 83 has a conical surface at the tip 831. In the free state shown in FIG. 4A, the conical surface is in contact with the movable part of the limit switch 81. The limit switch 81 is not activated. In this state, the base end portion 832 of the movable member 83 protrudes from the end surface 550 of the distal end arm 55.

  In this state, the self-propelled crane 1 travels, but when it arrives at the site, the four outriggers 5 bulge out of the traveling body 3 while being refracted, and are grounding members configured on the front end side of each outrigger 5. 59 is in contact with the ground as shown in FIG. As a result, the grounding member 59 rotates around the horizontal axis 590, and the rear end portion 560 of the connecting plate 56 pushes the movable member 83 into the distal arm 55 against the biasing force of the biasing member 82. As a result, the limit switch 81 is activated. Therefore, the outrigger monitoring device can monitor whether all of the four outriggers 5 are normally grounded based on the output from the limit switch 81 before work. When the outrigger monitoring device determines that the ground plate 57 is in the non-grounded state in any one of the four outriggers 5, it outputs a warning signal to that effect. Therefore, based on the warning signal output from the outrigger monitoring device, the control unit notifies the operator with a lamp display or a warning sound and prevents the start of crane work. Such monitoring work is also performed during crane work, and the control unit assumes that the grounding plate 57 is not grounded in any one of the four outriggers 5, and the outrigger monitoring device outputs a warning signal. When the output is made, the operator is informed by a lamp display and a warning sound, and the start of the crane work is emergency stopped.

  In this embodiment, the outrigger monitoring device has a built-in timer, and when the crane 8 is operating for a predetermined time or more, for example, a few seconds or more, the ground plate 57 is in a non-grounding posture. Only, it is determined that the ground plate 57 is in a non-grounded state. Therefore, even if the grounding plate 57 is lifted for a moment due to an impact or the like during the crane work, it is not determined as abnormal if it is lifted for such a short period of time, so that the crane work can be prevented from being interrupted unnecessarily.

  Furthermore, in this embodiment, the detector 8 detects that the grounding plate 57 is in the non-grounding posture when the grounding plate 57 is lifted by a predetermined dimension or more from the grounding state, as shown in FIG. For this reason, even if the ground plate 57 is slightly lifted, it is not determined that there is an abnormality if such a slight lift is made, so that it is possible to prevent the crane work from being interrupted unnecessarily.

(Main effects of this form)
As described above, in the self-propelled crane 1 of this embodiment, the detector detects whether the grounding member 59 is in the grounding posture or the non-grounding posture in each outrigger 5 before starting the crane work or during the crane work. When any of the outriggers 5 is detected and the grounding member 59 is in the non-grounding posture, the outrigger monitoring device outputs a warning signal. For this reason, it is possible to notify the operator of the fact and also to forcibly stop the crane work. Further, since it is only necessary to detect whether the grounding member 59 is in the grounding posture or the non-grounding posture in order to monitor the state of the outrigger 5, it is necessary to detect the ground reaction force applied to the outrigger 5 by an expensive sensor. Absent. Therefore, the outrigger monitoring device can be configured at low cost, and the state of the outrigger 5 can be reliably detected.

  Further, if only the attitude of the grounding member 59 is detected, the detector 8 can be constituted by the limit switch 81, the movable member 83, and the urging member 82. Such a detector 8 is extremely inexpensive. And the state of the outrigger 5 can be detected reliably.

It is a side view of the self-propelled crane to which the present invention is applied. FIG. 2 is a perspective view of the self-propelled crane shown in FIG. 1 with an outrigger protruding. (a), (b) is the top view and longitudinal view of the front-end | tip part of the outrigger of the self-propelled crane shown in FIG. (a), (b), (c) is explanatory drawing of the state which the outrigger of the self-propelled crane shown in FIG. 1 is free, the state where the detection of grounding is started, and the grounding state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Self-propelled crane 3 Traveling body 4 Boom 5 Outrigger 8 Detector 50 Outrigger main body 55 End arm 56 Connecting plate 57 Grounding plate 59 Grounding member 590 Horizontal shaft 81 Limit switch 82 Energizing member 83 Movable member 84 Coil spring

Claims (4)

In a self-propelled crane having a traveling body, a plurality of outriggers that can be bent while projecting from the traveling body side, and an outrigger monitoring device that monitors a ground contact state of the outriggers,
Each of the plurality of outriggers includes a grounding member that rotates around a horizontal axis at the tip of the outrigger main body and switches the attitude relative to the outrigger main body at the time of grounding,
The outrigger monitoring device includes a detector that detects whether each of the plurality of outriggers is in a grounding posture position or a non-grounding posture position in which the grounding member rotates around the horizontal axis. When it is determined that the grounding member is in a non-grounded state in any one of the plurality of outriggers based on the detection result of the device, a warning signal to that effect is output ,
The grounding member is supported by the horizontal shaft attached to the tip of the outrigger and is rotatable about the horizontal axis, and is supported by the support shaft attached to the connection plate and the support shaft. And a grounding plate that can swing around,
The connecting plate is rotatable about the horizontal axis between the ground contact posture contacting the front end surface of the outrigger and the non-ground contact posture separated from the front end surface.
The detector includes a limit switch disposed on the outrigger main body side, and a movable switch that activates the limit switch when the connecting plate is switched from the non-grounding posture to the grounding posture on the outrigger main body side. A self-propelled crane , comprising: a member; and an urging member that elastically holds the movable member at a position where the limit switch is not operated . In claim 1,
The outrigger monitoring device determines that the grounding member is in a non-grounded state when the detector outputs that the grounding member is in the non-grounding posture for a predetermined time or more during crane operation. A self-propelled crane characterized by In claim 2,
A self-propelled crane configured to emergency stop a crane operation when the warning signal is output from the outrigger monitoring device during the crane operation . In any one of claims 1 to 3,
The detector detects that the grounding plate is lifted when the connecting plate rotates a predetermined amount around the horizontal axis from the grounding posture toward the non-grounding posture side. .

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