JP2007204236A - Safety device of walking crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device of a walking crane capable of securing safety by preventing an operator from performing raising-up work forgetting use of an auxiliary crane. <P>SOLUTION: This walking crane is formed by installing an attachment having a boom and a jib different in a kind and the length in response to the work content in an upper revolving body, by revolvably mounting the upper revolving body on a lower traveling body. The safety deice of the walking crane has a recognizing means 31 recognizing the kind and the length of the attachment, a determining means 36 determining whether or not the auxiliary crane is required when raising up the attachment recognized by this recognizing means, and notifying means 41 and 42 notifying the operator of a case of requiring the auxiliary crane on the basis of a determining result of this determining means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a safety device for a mobile crane on which attachments having booms and jibs of different types and lengths according to work contents are mounted, and more particularly, to a device for taking safety measures when an attachment is caused.

  Conventionally, as a mobile crane, for example, as shown in FIG. 4, an upper swing body 2 is rotatably mounted on a crawler type lower traveling body 1, and a boom 3, a jib 4, and the like are coupled to the upper swing body 2. It is well known that an attachment 5 is attached and a counterweight 6 for maintaining a moment balance with the attachment 5 is provided. In FIG. 4, 11 is a hook hanging from the tip of the jib 4, 12 is a mast for raising and lowering the boom 3, and the mast 12 is a wire rope for raising and lowering a boom (also simply called a raising and lowering rope) 13 and The boom 3 is tilted by the winch 14, and the boom 3 is raised and lowered as the mast 12 tilts. Further, 15 is a front strut for supporting the jib 4, and 16 is also a rear strut. A wire rope 17 for winding the jib is wound around the ends of both struts 15 and 16, and this The wire rope 17 and the winch 18 are provided so that the jib 4 undulates at the tip of the boom 3.

  Such a mobile crane is classified into a crawler crane, a tower crane, a luffing crane, and the like depending on the type of the attachment 5. In the crawler crane, the jib 4 is fixedly coupled to the tip of the boom 3 of the attachment 5, the boom 3 is raised and lowered in the range of 30 ° to 80 °, and mainly works on the boom 3, and the jib 4 is used as an auxiliary. There is something to use. In the tower crane, a jib (also referred to as a tower jib) 4 is coupled to the tip of a boom (also referred to as a tower boom) 3 so that the boom 3 can be raised and lowered. The luffing crane is a kind of tower crane, and the boom 3 can be raised and lowered in a range of 60 ° to 90 °. Incidentally, the crane shown in FIG. 4 is a luffing crane from the type of the attachment 5. In the mobile crane, not only the length of the attachment 5, that is, the length of the boom 3 and the jib 4, but also the type of the attachment 5 is changed according to the work content. Yes.

  Moreover, a mobile crane is usually equipped with an overload prevention device for preventing the crane from being damaged or falling. For example, as disclosed in Patent Documents 1 and 2, the overload prevention device includes an angle detection unit that detects a boom angle or a jib angle of the attachment 5, and hoisting ropes 13 and 17 of the boom 3 or the jib 4 of the attachment 5. Tension detecting means for detecting the tension of the robot, a controller as a computing means for performing computation based on the detection value detected by these detecting means, and a notifying means for notifying the operator of the computation result by the controller. . As the notification means, a display device such as a liquid crystal display for notification by visual display is used in addition to an alarm device for notification by sound or voice. An example of screen display by this display device is shown in FIG. In the screen display of FIG. 5, the boom state, the jib length, the boom angle, the jib angle, and the like, as well as the angle states of the boom 3 and the jib 4 are schematically displayed.

  By the way, in such a mobile crane, after attaching the attachment 5 of the specific kind and length according to the work content to the upper revolving unit 2, the attachment 5 is caused by itself, especially in the case of a luffing crane, The operation procedure shown in FIGS. 6 to 8 and FIG. 4 is performed. That is, from the state in which the attachment 5 is laid on the ground (the state shown in FIG. 6), first, the hoisting rope 13 of the boom 3 is extended while the hoisting rope 17 of the jib 4 is extended so that the tip of the jib 4 does not leave the ground. Winding up causes the boom 3 (see FIG. 7). Next, when the boom 3 and the jib 4 are at a predetermined angle, only the boom 3 is raised (see FIG. 8), and a workable state (state shown in FIG. 4) is obtained.

  When the attachment 5 is caused, the magnitude relationship between the rear moment by the counterweight 6 and the front moment by the attachment 5 is greatly involved. For example, the boom 3 and the jib 4 of the attachment 5 are long, and the front moment is the rear moment. If it exceeds, the cause cannot be done on its own and safely. Therefore, conventionally, as a countermeasure, a method of increasing the counterweight 6 only at the time of triggering, as shown in FIG. 9, the floor plate 22 is fitted between the front end portion of the crawler 21 of the lower traveling body 1 and the ground, and the rear moment 10 or a method in which the boom 3 is lifted by the auxiliary crane (specifically, its hook) 23 until the front moment becomes a boom angle lower than the rear moment, as shown in FIG.

  However, since the overload prevention device described above does not function when the attachment 5 is caused, the operator determines whether the front moment exceeds the rear moment by looking at the instruction manual or the like. However, there is a demand for safety measures.

  On the other hand, as a response to such a request, for example, as disclosed in Patent Document 3, a boom angle detector detects a boom angle in a boom raising / lowering process at the time of crane assembly (corresponding to when the attachment 5 is raised), When this boom angle reaches an angle at which the floor plate 22 is to be mounted, an alarming means or a warning means that warns the user to mount the floor plate 22 has been proposed and put into practical use. In this practical use, the indicator of the overload prevention device is also used as a notification means, and on the screen of this indicator, as shown in FIG. Both the “side self-supporting ×” and the display “presence of flooring” are displayed.

However, the above-mentioned proposal is only applicable when adopting a method of increasing the front moment by installing the floor plate 22 as a countermeasure when the front moment exceeds the rear moment, and a method of using an auxiliary crane It cannot be applied when adopting. In particular, in the case of the attachment 5 for luffing cranes, the forward moment at the start of the raising is increased, so it is often necessary to employ a method using an auxiliary crane.
JP-A-11-246178 JP 2001-89078 A JP 2003-341977 A

  The present invention has been made in view of such various points, and the object of the present invention is to adopt a method of using an auxiliary crane, particularly as a countermeasure when the front moment exceeds the rear moment when the attachment is caused. It is intended to provide a mobile crane safety device that can prevent the operator from forgetting to use the auxiliary crane and perform work, and ensure safety.

  In order to solve the above-described problems, the invention according to claim 1 is provided such that an upper swing body is turnably mounted on a lower traveling body, and a boom and a different type and length according to the work content are mounted on the upper swing body. As a safety device for a mobile crane to which an attachment having a jib is attached, a recognition means for recognizing the type and length of the attachment, and whether or not an auxiliary crane is required when causing the attachment recognized by the recognition means. A determination means for determining and a notification means for notifying the operator when an auxiliary crane is required based on the determination result of the determination means are provided.

  In this configuration, when an attachment is caused after an attachment of a specific type and length is attached to the upper swing body according to the work content, the type and length of the attachment are recognized in advance by the recognition means, and this is determined by the determination means. It is determined whether or not an auxiliary crane is required when the recognized attachment is caused. Based on the determination result, if an auxiliary crane is necessary, the notification means notifies the operator. This prevents the operator from forgetting to use the auxiliary crane and causing it to work.

  According to a second aspect of the present invention, in the mobile crane safety device according to the first aspect, the determination means determines whether the auxiliary crane is necessary or not according to the type and length of the attachment. A configuration is provided that includes a storage unit that stores data and a determination unit that performs determination based on determination data stored in the storage unit. In this configuration, the determination means determines whether or not an auxiliary crane is required based on determination data determined according to the type and length of the attachment. Notification will be made at the stage before the attachment is caused after being attached to.

  The invention according to claim 3 is the safety device for a mobile crane according to claim 1, further comprising angle detection means for detecting a boom angle or a jib angle of the attachment, and the determination means is a kind of attachment. In addition to the length and the length, in addition to the boom angle or the jib angle, a storage unit that stores determination data that determines whether an auxiliary crane is necessary or not, and a boom angle detected by the angle detection unit or The jib angle includes a determination unit that determines whether or not an auxiliary crane is necessary based on the determination data stored in the storage unit. In this configuration, whether or not the auxiliary crane is required is determined based on the type and length of the attachment and the determination data determined according to the boom angle or the jib angle. Thus, notification is performed at a stage before the front moment reaches the boom angle or jib angle that exceeds the rear moment.

  The invention according to claim 4 is the safety device for a mobile crane according to claim 1, further comprising angle detection means for detecting a boom angle or a jib angle of the attachment, and the determination means is a kind of attachment. In addition to the first judgment data that determines whether or not an auxiliary crane is required depending on the length and the type and length of the attachment, an auxiliary crane is required depending on the boom angle or jib angle. A determination unit based on the first determination data stored in the storage unit that stores both the second determination data that determines whether the case is not necessary and the case that is not necessary, and the angle detection unit The determination unit that determines whether or not the auxiliary crane is necessary based on the second determination data stored in the storage unit for the boom angle or the jib angle detected by A configuration with. In this configuration, when the determination unit determines whether or not an auxiliary crane is required based on the first determination data determined according to the type and length of the attachment, the type and length of the attachment, In addition, there is a case where it is performed based on the second determination data determined according to the boom angle or the jib angle, and accordingly, even when an auxiliary crane is necessary, the attachment is caused after the attachment is attached to the upper swing body. Notification is performed in the previous stage, or notification is performed in the stage before the attachment reaches the boom angle or jib angle where the front moment exceeds the rear moment.

  According to a fifth aspect of the present invention, in the mobile crane safety device according to the third or fourth aspect, the tension detecting means for detecting the tension of the boom or jib hoisting rope of the attachment, and the triggering operation of the attachment. Stop means for stopping. In addition to the determination data, the storage unit of the determination means may exceed the tension of the boom or jib hoisting rope in response to the boom angle or jib angle in addition to the attachment type and length when the attachment is triggered. The limit tension value that should not be stored is stored, and the determination unit of the determination unit also determines whether or not the tension detected by the tension detection unit exceeds the limit tension value. When the detected tension exceeds the limit tension value according to the determination result of the determination unit, the attachment is caused and the operation is stopped. In this configuration, even if the operator forgets to use the auxiliary crane and performs the work, if the tension of the boom or jib hoisting rope exceeds the limit tension value and the front moment exceeds the rear moment, the stop means will stop the attachment. Therefore, the operation is stopped and the safety is ensured.

  According to a sixth aspect of the present invention, in the safety device for a mobile crane according to the fifth aspect, when the detected tension exceeds the limit tension value as a result of the determination by the determination unit, the notification means requires an auxiliary crane. The operator is informed in a manner different from the case where the determination is made. In this configuration, when the detected tension exceeds the limit tension value and the operation causing the attachment is automatically stopped, the notification is performed in a mode different from the notification when the auxiliary crane is determined to be necessary and urged to be used, The notification effect for the operator can be enhanced. Here, the notification in another mode is not limited to the case in which the same notification unit is used for notification in a different mode, but also includes the case in which different notification units, for example, a display unit and an alarm unit are used for notification.

  The invention according to claim 7 is the safety device for the mobile crane according to claim 3 or 4, further comprising an inclination angle detecting means for detecting an inclination angle of the lower traveling body or the upper swing body, and an action causing the attachment. Stop means for stopping the operation. In addition to the determination data, the storage unit of the determination unit stores a limit inclination angle that the inclination angle of the lower traveling body or the upper turning body should not exceed when the attachment is caused, and the determination unit of the determination unit Determines whether the tilt angle detected by the tilt angle detection means exceeds the limit tilt angle, and the stop means determines that the detected tilt angle is the limit tilt angle based on the determination result of the determination unit. It is configured to stop the triggering action when it exceeds the limit. In this configuration, even if the operator forgets to use the auxiliary crane and performs work, the forward moment of the crane exceeds the backward moment during the work, and the inclination angle of the crane body, that is, the lower traveling body or the upper turning body is the critical inclination. If the angle is exceeded, the stop means causes an attachment to stop the operation, and safety is ensured.

  According to an eighth aspect of the present invention, in the mobile crane safety device according to the seventh aspect of the present invention, when the detected inclination angle exceeds a limit inclination angle as a result of the determination by the determination unit, the auxiliary crane is required. It is configured to notify the operator in a manner different from the case where it is determined. In this configuration, when the detected tilt angle of the crane body exceeds the limit tilt angle and the operation causing the attachment is automatically stopped, the notification is made in a mode different from the notification when the auxiliary crane is determined to be necessary and urged to be used. As a result, the notification effect for the operator can be enhanced.

  According to a ninth aspect of the present invention, in the mobile crane safety device according to any one of the first to eighth aspects, the recognition means is provided by an input device through which an operator inputs the type and length of the attachment. Constitute. In this configuration, since the recognition unit includes an input device, implementation can be facilitated as compared to the case where the recognition unit is configured by a sensor or the like.

  As described above, according to the mobile crane safety device of the present invention, an auxiliary crane is necessary when the attachment is caused after the attachment of a specific type and length is attached to the upper swing body according to the work content. Since the operator is informed in advance of this, it is possible to prevent the operator from forgetting to use the auxiliary crane and to carry out the work, thereby ensuring safety.

  In particular, in the invention according to claim 2, when an auxiliary crane is required, notification is performed at a stage after the attachment is attached to the upper swing body and before the attachment is caused. It is effective when the forward moment is sometimes maximized.

  In the invention according to claim 3, since the notification is performed at a stage before the boom moment or jib angle at which the front moment exceeds the rear moment in the middle of raising the attachment, the attachment moment in which the forward moment is maximized in the middle of raising It is effective in the case.

  In the invention according to claim 4, even when an auxiliary crane is required, notification is performed at the stage after the attachment is attached to the upper swing body and before the attachment is caused, or the front moment causes the rear moment during the attachment. Since the notification is performed at the stage before reaching the higher boom angle or jib angle, it can be always caused regardless of the type of attachment, and the safety during the operation can be ensured.

  In the invention according to claim 5, even when the operator forgets to use the auxiliary crane and performs the work, the attachment of the boom or jib hoisting rope exceeds the limit tension value and the front moment exceeds the rear moment. Therefore, safety can be ensured more reliably.

  In the invention according to claim 6, when the detected tension exceeds the limit tension value and the attachment causing operation is automatically stopped, the notification is performed in a mode different from the notification when the auxiliary crane is determined to be necessary and the use thereof is urged. As a result, the notification effect for the operator can be enhanced.

  In the invention according to claim 7, even when the operator forgets to use the auxiliary crane and performs the work, if the inclination angle of the crane body exceeds the limit inclination angle, the action of the attachment is automatically stopped, so that safety is improved. It can be ensured more reliably.

  In the invention according to claim 8, when the detected inclination angle of the crane main body exceeds the limit inclination angle and the operation causing the attachment is automatically stopped, it is different from the notification when the auxiliary crane is determined to be necessary and prompts its use. Since notification is performed in a manner, the notification effect on the operator can be enhanced.

  Furthermore, in the invention according to claim 9, since the recognition means is composed of an input device, there is an effect that it can be easily implemented.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments that are the best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows a block configuration of a safety device for a mobile crane according to a first embodiment of the present invention. The configuration of the mobile crane itself is the same as that described with reference to FIG. 4 in the background art section. That is, the upper swing body 2 is mounted on the lower traveling body 1 so as to be capable of swinging, and the upper swing body 2 is provided with an attachment 5 including a boom 3 and a jib 4 having different types and lengths according to work contents. It is supposed to be. In addition, in the following description, when quoting the component of a crane, the code | symbol in FIG. 4 is also cited.

  In FIG. 1, 31 is an attachment input device as a recognizing means for recognizing the type and length of the attachment 5, and this input device 31 is installed in the cab of the upper swing body 2 so that the operator can select the type of attachment and Enter the length. Here, as the kind of attachment 5, there are an attachment for a crawler crane, an attachment for a tower crane, an attachment for a luffing crane, etc. The length of the attachment 5 is the length of the boom 3 and the jib 4 which are its constituent elements. is there. The input device 31 is preferably a touch type that sequentially displays the type and length of the attachment 5 on the display screen, and the operator presses one each time.

  Reference numeral 32 denotes a boom angle detector as an angle detection means for detecting the boom angle which is the ground angle of the boom 3 of the attachment 5. Reference numeral 33 denotes a boom hoisting as a tension detection means for detecting the tension of the hoisting rope 13 of the boom 3. This is a tension detector, and the detection signals of both detectors 32 and 33 are input to the controller 36 together with the output signal from the input device 31. The controller 36 functions as a determination unit that determines whether the auxiliary crane 23 (see FIG. 10) is necessary when the attachment 5 is caused based on the input signal, and a notification unit based on the determination result of the determination unit. And a function as a control means for controlling the boom winch hoist stop solenoid 43 as a stop means for stopping the triggering action of the attachment 5. The display device 41 and the alarm device 42 are provided in the cab of the upper swing body 2 in the same manner as the attachment input device 31. When the attachment input device 31 is a touch type, the input device 31 and the display 41 may be used together.

  In addition to the first determination data that determines whether or not the auxiliary crane 23 is necessary and the type and length of the attachment 5, the controller 36 determines the boom angle in accordance with the type and length of the attachment 5. Accordingly, the memory 37 serving as a storage unit that stores both the second determination data that determines whether the auxiliary crane 23 is necessary or not, and the first determination stored in the memory 37. The determination is made based on the data, and it is determined whether the boom angle detected by the boom angle detector 32 is a case where the auxiliary crane 23 is necessary based on the second determination data stored in the memory 37. And a determination unit 38. In addition to the first and second determination data, the memory 37 of the controller 36 causes the tension of the hoisting rope 13 of the boom 3 to cause the attachment 5 according to the boom angle in addition to the type and length of the attachment 5. The limit tension value that must not be exceeded is stored, and the determination unit 38 of the controller 36 also determines whether or not the tension detected by the boom undulation tension detector 33 exceeds the limit tension value. It has become.

  FIG. 2 is a flowchart showing the contents of determination or control by the controller 36, and the control contents will be described below with reference to FIG.

  That is, in FIG. 2, after starting, first, in step S <b> 1, the input signal from the attachment input device 31, that is, the type and length of the attachment 5 attached to the upper swing body 2 are read, and the boom angle detector 32. The boom angle which is a detection signal from the boom and the tension of the hoisting rope 13 of the boom 3 which is a detection signal from the boom hoisting tension detector 33 are read.

  Subsequently, it is determined whether or not the auxiliary crane 23 is necessary based on the first determination data stored in the memory 37 in step S2. The first determination data determines whether the auxiliary crane 23 is necessary or not depending on the type and length of the attachment 5, and the operator uses the attachment input device 31 to determine the type and length of the attachment 5. Judgment becomes possible at the time of inputting. When this determination is YES, the process proceeds to step S3, and based on the second determination data stored in the memory 37, it is determined whether or not the boom angle is within a support range that requires the use of the auxiliary crane 23. To do. In addition to the type and length of the attachment 5, the second determination data determines whether the auxiliary crane 23 is necessary or not depending on the boom angle. However, the boom angle is more precise than the first determination data because the boom angle is added to the determination element.

  When both the determinations in steps S2 and S3 are YES, in step S4, "Please use an auxiliary crane" is displayed on the display 41 to notify the operator, and then the process proceeds to step 6. On the other hand, when any one of the determinations in steps S2 and S3 is NO, in step S5, “please use an auxiliary crane” is not displayed on the display 41, and the process proceeds to step S8.

  In step S6, it is determined whether or not the tension of the hoisting rope 13 of the boom 3 is equal to or greater than the limit tension value stored in the memory 37. This limit tension value is determined according to the boom angle in addition to the type and length of the attachment 5, and is obtained by subtracting the safety value from the boom tension value when the forward moment of the crane exceeds the rear moment. Is set to a value. If this determination is YES, in step S7, the boom winch hoisting stop solenoid 43 is demagnetized to stop the hoisting operation of the boom hoisting winch 14, and hence the attachment 5, and the alarm device 42 is turned on. An alarm sound is generated and then the process returns. On the other hand, when the determination is NO, in step S8, the boom winch hoisting stop solenoid 43 is excited to continue the hoisting operation of the boom hoisting winch 14, and the alarm device 42 is turned OFF, and then the process returns.

  Therefore, in the first embodiment, after the attachment 5 of a specific type and length corresponding to the work content is attached to the upper swing body 2, the operator uses the attachment input device 31 to determine the type and length of the attachment 5. If it is input, the controller 36 determines whether or not the auxiliary crane 23 is necessary based on the first determination data stored in the memory 37, and the auxiliary crane 23 is necessary and the attachment for the luffing crane. If the crane's forward moment is maximized at the beginning of the trigger as shown in Fig. 5, the operator 41 forgets to use the auxiliary crane 23 because "Please do the auxiliary crane" is displayed on the display 41 at the stage before the trigger is started. Thus, it is possible to prevent the work from being started and to ensure safety.

  Depending on the type of attached attachment 5 and the like, in addition to the above-described determination, the controller 36 supports the boom angle required to support the auxiliary crane 23 based on the second determination data stored in the memory 37. It is also determined whether or not it is within the range, and the caution display of the display device 41 is performed only within the support range, so that the operator's attention can be effectively urged.

  In addition, even if the operator forgets to use the auxiliary crane 23 in spite of the caution display on the display 41 and starts the work or causes the work to continue, the tension of the hoisting rope 13 of the boom 3 reaches the limit tension value. When the forward moment of the crane exceeds the backward moment, the boom winch hoisting stop solenoid 43 is demagnetized by the controller 36 and the hoisting operation of the boom hoisting winch 14, and hence the action of the attachment 5, is stopped. Can be ensured more reliably. Further, at that time, the alarm device 42 is turned ON and an alarm sound is emitted, so that the operator can be surely notified.

  Furthermore, since the input device 31 on which the operator performs an input operation is used as a recognition means for recognizing the type and length of the attachment 5, implementation can be facilitated. Moreover, since the boom angle detector 32 and the boom undulation tension detector 33 can also be used for the overload prevention device normally installed in the crane, implementation can be further facilitated.

  FIG. 3 shows a block configuration of a safety device for a mobile crane according to a second embodiment of the present invention. In the case of this second embodiment, instead of the boom undulation tension detector 33 in the case of the first embodiment, as an inclination angle detection means for detecting the inclination angle of the crane body, that is, the lower traveling body 1 or the upper swing body 2. The main body inclination sensor 51 is provided, and a detection signal of the sensor 51 is input to the controller 36.

  In addition to the determination data, the memory 37 of the controller 36 stores a limit tension value that must not be exceeded when the tension of the hoisting rope 13 of the boom 3 is caused by the attachment 5 in the case of the first embodiment. In the case of the second embodiment, the tilt angle of the lower traveling body 1 or the upper swing body 2 stores the limit tilt angle that must not be exceeded when the attachment 5 is caused. The limit inclination angle is a value at which the forward moment of the crane exceeds the backward moment and the crane body is inclined forward to a dangerous state, and is constant regardless of the type and length of the attachment 5. This is different from the limit tension value. Other configurations of the safety device are the same as those in the first embodiment, and the same members / parts are denoted by the same reference numerals and the description thereof is omitted.

  The control content of the controller 36 is substantially the same as the flowchart in the case of the first embodiment shown in FIG. 2, but instead of determining whether the boom undulation tension exceeds the limit angle value in step S6, The difference is that it is determined whether or not the tilt angle detected by the main body tilt sensor 51 exceeds the limit tilt angle. When the detected inclination angle exceeds the limit inclination angle as a result of the determination, the hoisting of the boom winch 14 and the attachment 5 are automatically stopped together with an alarm output.

  Accordingly, also in the second embodiment, as in the case of the first embodiment, when the operator forgets to use the auxiliary crane 23 and performs work, the display 41 is displayed before or during the work. When the warning is displayed and the forward moment of the crane exceeds the rear moment, and the tilt angle of the crane body exceeds the critical tilt angle, the action caused by the attachment 5 is automatically stopped, ensuring safety. There are effects such as being able to ensure.

  The present invention is not limited to the first and second embodiments, but includes various other forms. For example, in each of the embodiments described above, the attachment input device 31 in which the operator inputs the type and length is used as the recognition means for recognizing the type and length of the attachment 5. In addition, the type and length of the attachment 5 attached to the upper swing body 2 may be automatically recognized using a tag, a reader, or the like.

  Moreover, in each said embodiment, according to the kind and length of the attachment 5, according to the kind and length of the attachment 5, the 1st determination data from which the case where an auxiliary crane is required and the case where it is not required are determined, and the kind of attachment 5 In addition to the length, the second determination data that determines whether the auxiliary crane is necessary or not is stored according to the boom angle, and the determination unit 38 of the controller 36 performs the first determination. A determination as to whether or not the auxiliary crane 23 is necessary based on the data, and a determination as to whether or not the boom angle detected by the boom angle detector 32 is a case where the auxiliary crane is necessary based on the second determination data. However, according to the present invention, only one of the first and second determination data may be stored in the memory 37 of the controller 36 in some cases. Together to 憶, it may be configured to perform the determination based on the determination data in the determination unit 38 of the controller 36.

  Further, according to the present invention, determination data for determining whether an auxiliary crane is necessary or not is stored in the memory 37 of the controller 36 according to the jib angle instead of the boom angle, and the boom angle detector 32 Instead, a jib angle detector is provided, and the determination unit 38 determines whether the auxiliary crane 23 is necessary based on the determination data stored in the memory 37 based on the jib angle detected by the jib angle detector. You may comprise.

It is a block block diagram of the safety device of the mobile crane which concerns on the 1st Embodiment of this invention. It is a flowchart figure which shows the control content of a controller. FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment. It is a side view of the attachment raising state of a mobile crane. It is a figure which shows the example of a screen display by the indicator of an overload prevention apparatus. It is a side view of the state before raising the attachment of a mobile crane. It is a side view in the middle of raising the attachment of a mobile crane. It is a side view similarly. It is a side view which shows the state which fitted the baseplate between the front-end part of the crawler of the lower traveling body of a mobile crane, and the ground. It is a side view which shows the state which lifts a boom with an auxiliary crane at the time of raising the attachment of a mobile crane.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper turning body 3 Boom 4 Jib 5 Attachment 13 Boom hoisting wire rope (boom hoisting rope)
17 Jib undulation wire rope (jib undulation rope)
31 Attachment input device (recognition means)
32 Boom angle detector (angle detection means)
33 Boom undulation tension detector (tension detection means)
36 controller (determination means)
37 Memory (storage unit)
38 determination part 41 indicator (notification means)
42 Alarm (notification means)
43 Boom winch hoisting stop solenoid (stopping means)
51 Body tilt sensor (tilt angle detection means)

Claims (9)

A mobile crane safety device in which an upper swing body is mounted on the lower traveling body in a swingable manner, and attachments having booms and jibs of different types and lengths are attached to the upper swing body according to the work content. There,
Recognition means for recognizing the type and length of the attachment;
Determination means for determining whether or not an auxiliary crane is required at the time of causing the attachment recognized by the recognition means;
A safety device for a mobile crane, comprising: notification means for notifying an operator when an auxiliary crane is required based on a determination result of the determination means.   The determination means includes a storage unit that stores determination data that determines whether an auxiliary crane is necessary or not according to the type and length of the attachment, and determination data stored in the storage unit. The safety device for a mobile crane according to claim 1, further comprising a determination unit that performs determination based on the determination unit. Angle detecting means for detecting the boom angle or jib angle of the attachment;
The determination means includes a storage unit that stores determination data that determines whether an auxiliary crane is required or not according to the boom angle or jib angle in addition to the type and length of the attachment, and the angle 2. A judging unit for judging whether or not an auxiliary crane is necessary based on judgment data stored in the storage unit for the boom angle or jib angle detected by the detecting means. Mobile crane safety device. Angle detecting means for detecting the boom angle or jib angle of the attachment;
The determination means includes first determination data for determining whether an auxiliary crane is required or not according to the type and length of the attachment, and the boom angle or jib angle in addition to the type and length of the attachment. And a storage unit that stores both second determination data that determines whether an auxiliary crane is necessary or not, and a determination based on the first determination data stored in the storage unit. And a determination unit that determines whether the boom angle or the jib angle detected by the angle detection unit is a case where an auxiliary crane is necessary based on the second determination data stored in the storage unit. The safety device for a mobile crane according to claim 1. Tension detecting means for detecting the tension of the boom or jib hoisting rope of the attachment;
And a stopping means for stopping the operation causing the attachment,
In addition to the determination data, the storage unit of the determination means determines whether the boom or jib hoisting rope tension exceeds when the attachment is caused, depending on the boom angle or jib angle in addition to the attachment type and length. The limit tension value that should not be stored is stored, and the determination unit of the determination means also determines whether the tension detected by the tension detection means exceeds the limit tension value.
5. The safety device for a mobile crane according to claim 3, wherein the stopping means is provided so as to stop the operation causing the attachment when the detected tension exceeds the limit tension value based on the determination result of the determining section.   The notification means is provided to notify the operator in a manner different from the case where the auxiliary crane is determined to be necessary when the detected tension exceeds the limit tension value according to the determination result of the determination section. Item 6. The mobile crane safety device according to Item 5. An inclination angle detecting means for detecting an inclination angle of the lower traveling body or the upper swing body;
And a stopping means for stopping the operation causing the attachment,
The storage unit of the determination means stores, apart from the determination data, a limit inclination angle that the inclination angle of the lower traveling body or the upper turning body must not exceed when the attachment is caused, and the determination unit of the determination means The inclination angle detected by the inclination angle detection means also determines whether or not the inclination angle exceeds the limit inclination angle,
5. The safety device for a mobile crane according to claim 3 or 4, wherein the stopping means is provided so as to stop the operation causing the attachment when the detected inclination angle exceeds the limit inclination angle based on the determination result of the determination section. .   The notification means is provided so as to notify the operator in a manner different from the case where the auxiliary crane determines that it is necessary when the detected inclination angle exceeds the limit inclination angle based on the determination result of the determination section. The safety device for a mobile crane according to claim 7.   The mobile crane safety device according to any one of claims 1 to 8, wherein the recognition means is an input device through which an operator inputs the type and length of an attachment.