JP5610748B2 - Crane overload prevention device control method - Google Patents

Description

The present invention relates to a control method for a crane overload prevention device.

  As one of mobile cranes, a self-propelled crawler crane as shown in FIG. 3 is known. The crane main body 1 is configured such that an upper swing body 3 provided with a cab 4 is turnably provided on an upper side of a lower travel body 2 that is to be driven by a crawler.

  A base end portion of a boom (post) 5 is attached to the upper swing body 3 so as to be able to be raised and lowered, and a boom hook (main hook) 6 is provided at the distal end portion of the boom 5 so as to be lifted and lowered. Further, if necessary, the base end of the jib 7 is connected to the tip of the boom 5 so as to be able to be lifted, and a jib hook (sub hook) 8 is mounted on the tip of the jib 7 so as to be lifted and lowered. (For example, refer to Patent Document 1).

  By the way, it is stipulated that an overload prevention device (moment limiter) is provided in a mobile crane in which a lifting load is a predetermined tonnage or more.

  In a crane with a boom, the working radius changes according to the boom length (boom length) and the tilt angle of the boom, and in a crane with a jib on the tip side of the boom (post), the same as above In addition to the boom length (post length) and boom inclination angle, the working radius varies depending on the jib length dimension (jib length) and the jib inclination angle. Furthermore, the rated total load (allowable lifting load) of the crane also changes according to the jib length and jib inclination angle.

  Therefore, in the overload prevention device, the change in the boom length and the boom inclination angle, and in the crane equipped with the jib, the relationship between the change in the jib length and the jib inclination angle and the corresponding change in the rated total load is further obtained. For example, when carrying out crane work using a boom with a certain boom length and a jib with a certain jib length, the data shown is accumulated in the form of a rated total load table. Based on the total rated load table corresponding to the length and the jib length of the jib, the total rated load at a certain working radius determined according to the tilt angle of the boom or the tilt angle of the jib is obtained, and the determined rating When the actual load is likely to exceed the rated total load at the working radius by comparing the actual load acting on the crane with the suspended load suspended on the boom hook or jib hook with reference to the total load. The Before the rated total load is exceeded, an alarm is displayed on the display of the overload prevention device in the operator's cab, an alarm lamp connected to the overload prevention device is turned on, or the overload prevention device is A sound alarm based on a buzzer sound or a message is output from a connected buzzer or speaker. Further, when the actual load exceeds the rated total load at the working radius, the overload prevention device outputs a command for stopping (slowly stopping) the operation of the crane to the crane drive system. By doing so, an excessive load does not act on the crane, and the possibility of the crane being damaged or falling can be avoided.

  In addition, in the crane equipped with the lattice type boom (post) 5 and the jib 7 like the crawler crane shown in FIG. 3, the boom (post) according to the work radius and the lifting height desired for the crane work. ) The boom length (post length) of 5 and the jib length of the jib 7 are appropriately selected and assembled.

  Therefore, when the length of the boom 5 or jib 7 used as described above changes, the rated total load (allowable lifting load) in the crane changes. It is necessary to switch the rated total load table as a reference for obtaining the rated total load corresponding to the above to the rated total load table corresponding to the length of the boom 5 or jib 7 actually used for crane work. In the lattice type boom 5 and jib 7, it is difficult to automatically detect the length of the boom, and the jib 7. Therefore, in the operation panel (not shown) of the overload prevention device provided in the cab 4, An operator, usually a crane operator, inputs a set value corresponding to the boom length or jib length of the boom 5 or jib 7 actually used for the crane operation and sets it in the overload prevention device. It is to (e.g., see Patent Document 2).

  Furthermore, in addition to the boom length and jib length, the overload prevention device is directly related to the working radius of the crane, so which of the boom hook 6 and the jib hook 8 is actually used for crane work, Items relating to whether the crane work is carried out by main suspension or auxiliary suspension, and items relating to the number of wire rope hooks, such as how many wire ropes are to be hung on the boom hook 6 or jib hook 8 involved in limiting the total rated load of the crane Furthermore, setting values are input for items relating to the weight (hook weight) of the boom hook 6 and the jib hook 8, respectively.

JP 2009-137666 A Japanese Patent Publication No. 6-94350

  However, in the conventional overload prevention device, as described above, on the operation panel of the overload prevention device installed in the cab 4, selection of main suspension or auxiliary suspension for carrying out crane work, boom length, jib Each setting item related to the crane's work mode (work form) such as length, number of wire rope hooks, hook weight, etc. is entered and set. The input and setting work are the input person, usually the crane operator. Therefore, even if the operator inputs a wrong set value or forgets to enter the set value, the fact is that it cannot be checked.

  Therefore, in the unlikely event that an input error of each setting item related to the operation mode by the crane operator as described above or forgetting to enter the setting value occurs, the overload prevention device will Since it operates based on the rated gross weight table other than the rated gross weight table corresponding to the work mode of the crane that is performing the work, the overload prevention device prevents the excessive load from acting on the crane. Thus, there is a possibility that the function of avoiding the possibility of damage to the crane or falling over cannot be performed accurately.

  Furthermore, in the above-described conventional overload prevention device, it is possible to input and set each setting item related to the work mode of the crane at an arbitrary time, so that an excessive load is applied to the crane during the crane operation. When a problem that acts is caused, if the setting value of each setting item of the overload prevention device is changed after the problem occurs, it may be difficult to identify the cause of the problem.

Therefore, the present invention provides a crane in the overload prevention device in which the input work of each setting item related to the work mode of the crane in the crane overload prevention device is performed under the condition that a person other than the input person is present. It is an object of the present invention to provide a crane overload prevention device control method capable of improving the accuracy of input of set values of the respective setting items relating to the work mode.

In order to solve the above-mentioned problem, the present invention provides a control method for an overload prevention device for a crane equipped with a boom, according to claim 1, wherein an operator of the crane controls the engine of the controller of the overload prevention device. When the key switch is turned on and the engine key switch is turned on, the controller is activated, and a switch key administrator different from the crane operator turns on the work mode setting permission switch using the switch key. By operating, the controller shifts to a work mode setting process, and in the work mode setting process, the operator of the crane sets the rated total load of the crane in the presence of the switch key administrator. The process of inputting the setting value of the setting item of the crane working mode as the basis to be determined, and the switch key administrator By extracting the Chiki, the working mode setting permission switch is turned off, with the controller is shifted to crane operation monitoring process measures the actual load acting on the crane from the suspended load during operation of the crane has a actual load which is the measurement, based on the relationship between the rated load of the crane that changes in accordance with change in the tilt angle of the boom, and a step of preventing the overload acting on the crane A control method for the crane overload prevention device is provided.

According to a second aspect of the present invention, there is provided a control method for an overload prevention device for a crane provided with a boom and a jib attached to the tip of the boom. When the key switch is turned on and the engine key switch is turned on, the controller is activated, and a switch key administrator different from the crane operator turns on the work mode setting permission switch using the switch key. By operating, the controller shifts to a work mode setting process, and in the work mode setting process, the operator of the crane sets the rated total load of the crane in the presence of the switch key administrator. The process of inputting the setting value of the setting item of the work mode of the crane as the basis to be determined, and the administrator of the switch key By extracting the Tchiki, the working mode setting permission switch is turned off, with the controller is shifted to crane operation monitoring process measures the actual load acting on the crane from the suspended load during operation of the crane a step of preventing the actual load which is the measurement, based on the relationship between the boom and the crane of rated load which varies according to the change of the inclination angle of the jib, that overload the crane acts, A control method for an overload prevention device for a crane having

According to the control method of the crane overload prevention device of the present invention, the following excellent effects are exhibited.
(1) In a method for controlling an overload prevention device for a crane equipped with a boom, a crane operator performs an on operation of an engine key switch of a controller of the overload prevention device, and an on operation of the engine key switch. As a result, the controller is activated, and an administrator of a switch key different from the crane operator turns on the work mode setting permission switch with the switch key, so that the controller shifts to the work mode setting process. In the work mode setting process, the crane operator inputs the set value of the work mode setting item of the crane that is the basis for determining the rated total load of the crane in the presence of the switch key administrator. And the switch key manager removes the switch key so that the work mode setting permission Pitch is turned off, the controller is shifted to crane operation monitoring process, as well as measuring the actual load acting on the crane from the suspended load during operation of the crane, the actual load which is the measurement, the based on the relationship between the rated load of the crane that changes in accordance with change in the tilt angle of the boom, as a control method of the overload prevention device of a crane with a step to prevent overload to the crane acts Therefore, since the setting work of the crane work mode can be performed in the presence of the administrator of the switch key of the work mode setting permission switch in addition to the input person, each setting item regarding the crane work mode is set. The setting value of each work item can be checked by the input person and the switch key administrator. It is possible to suppress the scan, it is possible to prevent the input operation forgetting settings in advance. Therefore, the accuracy of the setting values of the setting items related to the work mode of the crane can be increased, so that the safety of the crane work can be further increased.
(2) Moreover, since the setting value of each setting item regarding the work mode of the crane in the state where the manager of the switch key is not present can be prevented, an excessive load is not applied to the crane. The original function of the crane overload prevention device that avoids the possibility of damage to the crane or overturning can be exhibited accurately.
(3) In a method for controlling a crane overload prevention device having a boom and a jib attached to the tip of the boom , the crane operator turns on the engine key switch of the controller of the overload prevention device. When the engine key switch is turned on, the controller is activated, and an administrator of a switch key different from the crane operator turns on the work mode setting permission switch with the switch key. The crane moves to the work mode setting process, and in the work mode setting process, the crane operator becomes the basis for determining the rated total load of the crane in the presence of the switch key manager. The process of inputting the setting value of the setting item of the work mode, and the switch key administrator extracts the switch key. It is, together with the working mode setting permission switch is turned off, the controller is shifted to crane operation monitoring process measures the actual load acting on the crane from the suspended load during operation of the crane, the measurement And a step of preventing an overload from acting on the crane based on the relationship between the actual load applied and the rated total load of the crane that changes in accordance with changes in the inclination angle of the boom and jib. The same effects as in the above (1) and (2) can also be obtained by adopting the control method for the overload prevention device .

It is a figure which shows the outline | summary of the overload prevention apparatus of the crane in this invention. It is a flowchart which shows the control procedure in the controller of the overload prevention apparatus of FIG. It is a schematic side view which shows an example of a crawler crane.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an example applied to a crane having a boom 5 and a jib 7 as shown in FIG. 3 as an embodiment of the crane overload prevention apparatus according to the present invention. The configuration is as follows.

In other words, the crane overload prevention apparatus according to the present invention connects the controller 9 of the overload prevention apparatus to the power line (control bus) 10 via the engine key switch 11 of the crane, as shown in FIG. As the engine key switch 11 is turned on, the controller 9 of the overload prevention device can be activated.

  Further, the controller 9 of the overload prevention device is connected to a work mode setting permission switch 12 that can be turned on only when a switch key (not shown) is inserted.

  The controller 9 of the overload prevention device receives a measurement signal of the boom or jib inclination angle from the sensors 13 for measuring the inclination angle of the boom 5 or jib 7 (see FIG. 3) in the crane. It is assumed that a measurement signal for the load of the suspended load can be input from the load sensor 14 for measuring the load of the suspended load. Furthermore, a speaker (including a buzzer) 15 for outputting an audio alarm and an alarm lamp 16 are connected to the controller 9 of the overload prevention device.

  More specifically, the controller 9 of the overload prevention device has a processing function as shown in FIG.

Specifically, when the controller 9 of the overload prevention device is activated in response to the ON operation of the engine key switch 11 shown in FIG. 1 (step 1: S1), first, the work mode setting permission switch 12 is activated. It is determined whether the operation state is on or off (step 2: S2), and when it is determined that the work mode setting permission switch 12 is in the off operation state, the crane work monitoring in step 3 (S3). proceeds to the process, the crane work monitoring process: (step 3 S3), when performing a crane operation by the crane equipped with overload protection apparatus for a crane according to the present invention, based on a measurement signal input from the load sensor 14 The actual load acting on the crane by the suspended load is measured, and the boom 5 detected by the sensors 13 and The total rated load of the crane when the working radius determined according to the inclination angle of the hub 7 is obtained based on the rated total load table, and the calculated rated total load is compared with the measured actual load. When the actual load is likely to exceed the calculated rated total load, an alarm is displayed on a display (not shown) of the overload prevention device in the cab before the rated total load is exceeded. When the lamp 16 is turned on and a sound alarm is output from the speaker 15, and the actual load exceeds the determined rated total load, a crane (not shown) A command for stopping the operation (slow stop) can be output to the drive system.

  In addition, the process performed when the actual load in the crane work monitoring process (step 3: S3) is likely to exceed the determined rated total load, and the actual load exceeds the determined total rated load. As a process to be performed, any process other than those described above may be performed as long as the process is performed by a conventionally used crane overload prevention device.

  On the other hand, when the controller 9 of the overload prevention device determines in step 2 (S2) that the work mode setting permission switch 12 is in the ON operation state by inserting a switch key, the controller 9 performs step 4 (S4). ) To the work mode setting process, and in the work mode setting process (step 4: S4), selection of main suspension or auxiliary suspension for carrying out the crane operation, boom length, jib length, number of wire rope hooks, hook weight, etc. The setting value regarding each setting item of the work mode (work form) of the crane can be input.

When using a crane equipped with the overload prevention device of the crane in the present invention, first, in the cab 4 of the crane (see FIG. 3), the engine key switch 11 of the crane by turning on with a higher structure When the crane is activated, the controller 9 of the overload prevention device is also activated simultaneously.

  In this state, when an administrator of a switch key (not shown) of the work mode setting permission switch 12 turns on the work mode setting permission switch 12 with the switch key, the controller 9 of the overload prevention device sets the work mode setting. Since it is possible to enter each setting item related to the work mode of the crane by shifting to the process, in this state, the operator selects the main suspension or supplementary suspension for carrying out the crane operation, boom length, jib length, wire Input the setting values for each setting item such as the number of hooks and hook weight.

  Next, when an administrator of a switch key (not shown) of the work mode setting permission switch 12 pulls out the switch key and the work mode setting permission switch 12 is turned off, the controller of the overload prevention device 9 is automatically transferred to the crane work monitoring process.

  Therefore, thereafter, the actual load acting on the crane from the suspended load measured by the load sensor 14 depends on the inclination angle of the boom 5 or jib 7 (see FIG. 3) measured by the sensors 13. If the total rated load of the crane, which is determined from the working radius determined in this way and the rated total load table corresponding to the working mode set in the above-described working mode setting process, is exceeded, the operator's cab will exceed the rated total load before the rated total load is exceeded. An alarm is displayed on a display (not shown) of the load prevention device, the alarm lamp 16 is turned on, and an audio alarm is output from the speaker 15.

  Further, when the actual load exceeds the rated total load at the working radius, the crane drive system is quickly stopped (slowly stopped).

Thus, according to the overload preventing apparatus for a crane according to the present invention, manages the switch key (not shown) of the working mode setting permission switch 12, to another person and the operator is input who sets the working mode of the crane by so as to, when the operator against overload preventing apparatus for a crane according to the present invention equipped with the crane performs input setting work of the working mode of the crane, the illustration of the working mode setting permission switch 12 Since it is necessary to be present by the switch key manager, the operator and the switch key manager can confirm each setting item related to the work mode of the crane. In addition, it is possible to suppress input errors in the setting values of the setting items of the work mode and to It is possible to prevent the input work forgetting of in advance. Therefore, it is possible to further increase the safety of crane work.

Further, in the crane overload prevention device according to the present invention, the operator can arbitrarily set the setting values of the setting items related to the work mode of the crane when the administrator of the switch key (not shown) of the work mode setting permission switch 12 is not present. It cannot be changed.

Therefore, it is possible to an excessive load on the crane by overload preventing apparatus for a crane according to the present invention is not to act, to accurately perform the function of avoiding the risk of leading to damage or overturning of the crane.

  Moreover, in the unlikely event that an excessive load is applied to the crane during crane operation, the cause of the problem may be a setting error in each setting item of the crane work mode, or a mechanical or device The effect of facilitating the identification of the cause of a problem such as whether it is due to a general factor can also be expected.

  In addition, this invention is not limited only to the said embodiment, The rated total load table etc. used as a reference | standard for calculating | requiring a rated total load (allowable lifting load) according to the work mode (work form) of a crane The crane may be applied to any type of crane as long as the crane is equipped with an overload prevention device of a type in which it is necessary to switch the data. You may apply to the crane of the type which performs a crane operation only with a boom, without equip | installing a jib on the front end side of a boom.

  Therefore, the setting item of the crane work mode may be changed as appropriate according to the type of crane to be applied. The sensor type, mounting position, number of installations, etc. of the load sensor 14 for measuring the actual load of the crane and the sensor 13 for detecting the working radius of the crane can be freely selected according to the type of crane to be applied. May be set to

  Further, the type of alarm that is output when the actual load is likely to exceed the rated total load may be appropriately changed according to the type of crane to be applied. Further, when the actual load exceeds the rated total load, an alarm that can be distinguished from an alarm that is output when the actual load is likely to exceed the rated total load may be output.

  Of course, various modifications can be made without departing from the scope of the present invention.

5 Boom 7 Jib 12 Work mode setting enable switch

Claims (2)

In a control method for an overload prevention device for a crane equipped with a boom, a step in which an operator of the crane turns on an engine key switch of a controller of the overload prevention device, and the control according to an on operation of the engine key switch. The controller is activated, and the administrator of the switch key different from the crane operator turns on the work mode setting permission switch with the switch key, so that the controller shifts to the work mode setting process, and the work In the mode setting process, the operator of the crane inputs the set value of the setting item of the crane working mode which is the basis for determining the rated total load of the crane in the presence of the administrator of the switch key. And the switch key administrator pulls out the switch key to enable the work mode setting permission switch. Turned off, the controller is shifted to crane operation monitoring process, as well as measuring the actual load acting on the crane from the suspended load during operation of the crane, the actual load which is the measurement, the inclination of the boom based on the relationship between the rated load of the crane, which changes in accordance with a change of the angular control of the overload preventing apparatus for a crane, characterized in that and a step to prevent overload to the crane acts Way . In a control method for an overload prevention device for a crane provided with a boom and a jib attached to the tip of the boom , the crane operator turns on an engine key switch of a controller of the overload prevention device; and When the engine key switch is turned on, the controller is activated, and a switch key administrator different from the crane operator turns on the work mode setting permission switch with the switch key, so that the controller operates. Transition to the mode setting process, and in the work mode setting process, in the presence of the switch key manager, the crane operator sets the crane's work mode as a basis for determining the rated total load of the crane. The process of inputting the setting value of the setting item, and the switch key administrator must remove the switch key The working mode setting permission switch is turned off, the controller is shifted to crane operation monitoring process, as well as measuring the actual load acting on the crane from the suspended load during operation of the crane, which is the measured A step of preventing an overload from acting on the crane on the basis of a relationship between an actual load and a rated total load of the crane that changes in accordance with a change in the inclination angle of the boom and jib. A control method for an overload prevention device for a crane.

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