JP2004010223A - Alarming device for crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alarming device for a crane to regulate unnecessary alarms from a hook overwinding alarming device to detect that a hook block 7 of a crane is lifted to a lifting upper limit position S to effect alarming and a floating alarming device to alarm by detecting floating of either one of right and left outrigger devices 1b and 1a. <P>SOLUTION: The alarming device for a crane is constituted that an outrigger non-installation state detecting means to detect that right and left outrigger devices 1b and 1a are both brought into a non-installation state is provided and a hook overwinding alarm is regulated when the detecting means is operated, and a hook non-work position detecting means is provided to detect lifting of the hook block 7 to a lifting upper limit position approaching a telescopic boom forward end part 4d, and a floating alarm is regulated when the detecting means is operated. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
The present invention relates to an alarm device for a crane, particularly a hook overwind alarm device that detects an overwound state of a hook block and issues an alarm, and an outrigger that issues an alarm by detecting that an outrigger device provided on the left and right has begun to float. The present invention relates to a lift alarm device.
[0002]
[Prior art]
As a typical example of an alarm device used in a crane, a hook overwind alarm device that detects an overwound state of a hook block and issues an alarm, and an alarm that detects that an outrigger device provided on the left and right has begun to float and issues an alarm. There is an outrigger lift alarm device. The configuration of this type of alarm device that has been used in the related art will be described with reference to an example of an alarm device mounted on a vehicle-mounted crane that is mounted at a position behind a driver's cab of a vehicle and loads a load onto a carrier or the like.
[0003]
A is a vehicle-mounted crane. As shown in FIG. 3, the vehicle-mounted crane A includes a base 2 having left and right outrigger devices 1a and 1b that can be installed by projecting to both sides of a vehicle (not shown), and swivel on the base 2. A swivel post 3 that is freely mounted, a telescopic boom 4 that is attached to the swivel post 3 so as to be able to move up and down, and a distal end boom 4b, 4c is sequentially and telescopically inserted into a base end boom 4a. A hook block 7 hangs up and down freely from the distal end 4d of the telescopic boom by a wire rope 6 fed from a winch device 5 attached to the base end. Reference numeral 8 denotes an up / down cylinder that drives the telescopic boom 4 up and down.
[0004]
In the vehicle-mounted crane A configured as described above, first, the left and right outrigger devices 1a and 1b are installed to stably support the crane, and in this state, the load is hung on the hook block 7 and the swing post 3 is driven to swing. At the same time, the telescopic boom 4 is driven to extend and retract, and the hoist is driven up and down to move the hook block 7 to an arbitrary position, thereby performing the loading operation of the load.
[0005]
In order to prevent the hook block 7 from swinging and damaging the telescopic boom 4 and peripheral devices when the vehicle is moved after the work is completed, the hook block 7 is moved to the tip of the telescopic boom. A well-known hook storage device 9 that is stored in a contact state in contact with the portion 4d (a state shown by a chain line in FIG. 3) is attached.
[0006]
Reference numeral 10 denotes a hook overwinding alarm device that detects that the hook block 7 has been wound up to the winding upper limit position S (hereinafter, referred to as an overwinding alarm position) close to the telescopic boom tip 4d, and issues an alarm. The hook overwinding alarm device 10 includes hook overwinding detecting means 10a attached to the tip 4d of the telescopic boom 4 and having a detection weight 10c suspended by a detection wire 10b of a predetermined length (overwinding alarm length). And an alarming means 10d for issuing an alarm based on the detection signal of the hook overwinding detecting means 10a. For this reason, if the hook block 7 is wound up to the overwind warning position S during crane operation and becomes overwound, the hook block 7 abuts on the weight 10c and the supporting force of the detection wire 10b is reduced. Is detected by the hook overwinding detection means 10a, and an alarm signal is output to activate the alarm means 10d. Thereby, the operator can easily grasp that the hook block 7 has been wound up to the overwinding state, and can quickly perform an overwinding avoiding operation such as stopping the hoisting motion of the winch device 5. is there. Reference numeral 12 denotes a power source, and reference numeral 13 denotes a main switch that is turned on manually or in conjunction with a crane operation (for example, a contact operation of a power take-out device).
[0007]
Reference numeral 14 denotes an outrigger lift alarm device that detects that the overturning moment that causes the crane to tip over has increased and that the outrigger devices 1a and 1b located on the opposite side of the suspended load have started to float, and issues an alarm. The outrigger lifting alarm device 14 is, for example, that the load pressure of the jack cylinders 15a, 15b that drive the left and right outrigger devices 1a, 1b has fallen below a predetermined pressure (20N or less in terms of the supporting force of the outrigger devices 1a, 1b). Pressure switches 16a and 16b for detecting the pressure and outputting a detection signal, and alarm means 10d for issuing an alarm based on the detection signals of the pressure switches 16a and 16b. For this reason, if the overturning moment which causes the crane to tip over during the crane operation becomes large and the supporting force of the outrigger devices 1a, 1b located on the opposite side to the suspended load decreases and starts to float, the load pressure on the jack cylinders 15a, 15b is reduced. When the pressure drops to near zero pressure, that is, when the pressure becomes equal to or less than a predetermined pressure, the pressure switches 16a and 16b are activated to output an alarm signal, and the alarm means 10d is operated. Accordingly, the operator can easily grasp the state in which the crane has started to fall, and can quickly perform a fall avoiding operation such as stopping the operation of the crane on the dangerous side.
[0008]
[Problems to be solved by the invention]
However, the conventional alarm devices configured as described above, that is, the hook overwinding alarm device 10 and the outrigger lifting alarm device 14 are configured to be activated by turning on the main switch 13, so that the following problems occur. there were. That is, when the main switch 13 is turned on to start the crane operation, the crane in the retracted position as shown by the chain line in FIG. 3 causes the hook block 7 to abut on the telescopic boom tip 4d and the hook overwind detecting means 10a to detect the crane. Since the left and right outrigger devices 1a and 1b are also stored in the minimum contracted state (non-installed state) and the pressure switches 16a and 16b are in the detection state, an alarm is issued simultaneously with switch-on. Had become. This alarm is an unnecessary alarm during the shift of the crane from the retracted position to the work position, and the installation of the left and right outrigger devices 1a and 1b is completed and the hook block 7 is moved below the overwind alarm position S. Since it is continued until it is lowered, it may become a troublesome alarm in a quiet residential area or the like, and may cause a noise problem.
[0009]
Further, if the left and right outrigger devices 1a, 1b are contracted at the time of shifting to the storage position after the crane operation is completed, the pressure switches 16a, 16b are detected simultaneously with the release of the outrigger devices 1a, 1b. The state is the same as the outrigger floating warning state), and a warning is issued. This alarm is an unnecessary alarm during the shift of the storage position when the crane shifts to the storage position, and is continued until the main switch 13 is turned off. In a residential area or the like, a troublesome alarm is generated, which may cause a noise problem.
[0010]
The present invention has been made in view of the above-described problems, and eliminates unnecessary warnings that are issued when shifting to a crane working attitude or when shifting to a stowed attitude, and does not generate noise even in a quiet residential area. It is an object of the present invention to provide a crane alarm device as described above.
[0011]
[Means for Solving the Problems]
The present invention has the following configuration as means for solving the above problems.
[0012]
That is, the alarm device for a crane according to claim 1 of the present invention includes a base on which left and right outrigger devices that can be installed on the ground are mounted, a telescopic boom mounted on the base via a swivel post so as to be able to move up and down, A hook block that is hung up and down freely at the tip of the boom and is stored in contact with the tip of the telescopic boom when not in use, and the hook block is wound up to the winding upper limit position close to the tip of the telescopic boom. The present invention is directed to a crane alarm device including hook overwind detection means for detecting that the hooking operation has been performed, and alarm means for issuing an alarm based on the detection result of the hook overwind detection means.
[0013]
The alarm device further includes an outrigger non-installation state detection unit that detects that both the left and right outrigger devices are in the non-installation state, and restricts an alarm by the alarm unit when the outrigger non-installation state detection unit operates. It is configured to
[0014]
The alarm device thus configured detects the non-installation state of the left and right outrigger devices, that is, the state until the installation work of the left and right outrigger devices is completed, by the outrigger non-installation state detection means, and regulates the hook overwind alarm. With such a configuration, an unnecessary alarm, that is, the hook overwinding alarm during the shift of the working posture, is restricted, so that the crane operation can be performed without worrying about noise even in a quiet residential area or the like.
[0015]
The warning device for a crane according to claim 2 is a base on which left and right outrigger devices that can be installed on the ground are mounted, a telescopic boom mounted on the base via a swivel post so as to be able to move up and down, and a tip of the telescopic boom. A hook block which is hung up and down freely and is stored in contact with the telescopic boom tip when not in use, and at least one of the outrigger devices attached to the left and right outrigger devices is lifted. The present invention is directed to an alarm device for a crane, comprising a lift detecting means for detecting the occurrence of an event and an alarm means for issuing a warning based on a detection result of the lift detecting means.
[0016]
Then, the alarm device is provided with a hook non-working position detecting unit that detects that the hook block has been wound up to a winding upper limit position close to the telescopic boom tip, or a contact position in contact with the telescopic boom tip. When the hook non-working position detecting means is operated, the warning by the warning means is regulated.
[0017]
The alarm device thus configured is configured such that the hook non-working position detecting means causes the hook block to be wound up to the winding upper limit position close to the distal end of the telescopic boom, or to the contact position in contact with the distal end of the telescopic boom. The outrigger lift alarm is controlled by detecting that the block has been hoisted to the non-working position. The crane work can be performed in a residential area without worrying about noise.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. The reference numerals 1 to 16 described as the prior art with reference to FIG. 3 are used in the following description as synonyms.
[0019]
In FIG. 1, reference numeral 10a1 denotes a hook overwinding detection switch attached to the tip 4d of the telescopic boom 4. The hook overwind detection switch 10a1 is configured by suspending a detection weight 10c with a detection wire 10b of a predetermined length (overwind alarm length), similarly to the conventional switch, and a hook block during crane operation. If the hook block 7 is wound up to the overwind alarm position S and becomes an overwind state, the hook block 7 abuts on the detection weight 10c and the supporting force of the detection wire 10b is reduced. And outputs an overwinding detection signal (switch 10a1 is off). The hook overwind detection switch 10a1 detects that the hook block 7 has been wound up to the winding upper limit position close to the telescopic boom tip 4d, that is, the hook block 7 has been wound up to the non-working position. It also has a hook non-working position detecting means for detecting.
[0020]
In addition, the hook overwinding detection switch 10a1 measures the suspension length of the hook block 7 suspended from the boom tip 4d using a distance measuring sensor (not shown) such as an ultrasonic wave in addition to the above configuration. However, an overwinding detection signal may be output when the measured value becomes equal to or less than the overwinding alarm length.
[0021]
Reference numerals 16a and 16b are lift detection switches for detecting that the outrigger devices 1a and 1b located on the opposite side to the suspended load have risen due to the crane being overloaded during work. In this embodiment, the lift detection switches 16a and 16b reduce the holding pressure of the jack cylinders 15a and 15b for driving the left and right outrigger devices 1a and 1b to, for example, 20 N or less in terms of the support force of the outrigger devices 1a and 1b. In other words, it is constituted by a pair of pressure switches which are turned off when the pressure drops to a pressure close to zero pressure and outputs a lift detection signal. For this reason, if the crane becomes overloaded and the holding pressure of the jack cylinders 15a, 15b located on the opposite side to the suspended load decreases to near zero pressure, the pressure switches 16a, 16b detect this decrease in holding pressure. It turns off and outputs a floating detection signal. On the other hand, the pressure switches 16a and 16b keep the holding pressure of the jack cylinders 15a and 15b close to zero pressure until the crane shifts to the working posture, that is, until the left and right outrigger devices 1a and 1b are installed. Therefore, the pressure switches 16a and 16b are operated to output an outrigger non-installation state detection signal. Therefore, the pressure switches 16a, 16b are lift detecting means for detecting that at least one of the left and right outrigger devices 1a, 1b in claim 2 has floated, and a lift detecting means. The outrigger non-installation state detecting means for detecting that both the left and right outrigger devices 1a and 1b are in the non-installation state is also provided.
[0022]
The lifting detection switches 16a and 16b measure the supporting force of the left and right outrigger devices 1a and 1b using a load cell, a pressure sensor, or the like (not shown) in addition to the above-described configuration, and the supporting force is non-ground. A configuration may be employed in which a lift detection signal is output when the value becomes equal to or less than a predetermined value corresponding to the state. Further, the left and right outrigger devices 1a, 1b are attached with play, and are configured to detect a backlash displacement due to a decrease in the supporting force of the outrigger devices 1a, 1b using a switch or the like and output a lift detection signal. May be.
[0023]
Reference numeral 19 denotes a relay which is excited by an overwinding detection signal of the hook overwinding detection switch 10a1. The relay 19 has two relay switches, an a contact switch 19a and a b contact switch 19b. When the crane is in a normal working state (non-overwound state), the hook overwound detection switch 10a1 is on, so that the a contact The switch 19a is turned on and the b-contact switch 19b is turned off. On the other hand, if the hook block 7 is wound up and becomes over-wound, the hook over-wound detection switch 10a1 is turned off, so that the a-contact switch 19a is turned off and the b-contact switch 19b is turned on. It has become.
[0024]
Reference numeral 20 denotes a relay that is energized by a detection signal of the one pressure switch 16a. The relay 20 is provided with a c-contact switch, and when one outrigger device 1a is in the installed state, the pressure switch 16a is on, so that the relay switch connects the c-contact 20c and the a-contact 20a, and the crane is overloaded. When the outrigger device 1a rises to the non-installed state, the pressure switch 16a is turned off, and the relay switch is switched so that the c contact 20c and the b contact 20b are connected. Reference numeral 21 is a relay that is operated to be excited by a detection signal of the other pressure switch 16b. The relay 21 has a c-contact switch like the relay 20, and the pressure switch 16b is on when one of the outrigger devices 1b is in the installed state, so that the c-contact 21c and the a-contact 21a are connected. If the crane is overloaded and the outrigger device 1b rises and is not installed, the pressure switch 16b is turned off and the relay switch is switched so that the c-contact 21c and the b-contact 21b are connected.
[0025]
The a-contact 20a of the relay 20 and the a-contact 21a of the relay 21 are connected in series via the a-contact switch 19a of the relay 19. Similarly, the b-contact 20b of the relay 20 and the b-contact 21b of the relay 21 They are connected in series via a b-contact switch 19b. Further, the c-contact 20 c of the relay 20 is connected to the power supply 12 via the main switch 13, and the c-contact 21 c of the relay 21 is connected to the alarm relay 22. The b-contact switch 22b of the alarm relay 22 is connected to the alarm buzzer 23, so that the alarm buzzer 23 operates when the alarm relay 22 is not energized.
[0026]
Next, the operation of the alarm device will be described.
First, the left and right outrigger devices 1a and 1b are stored in the most contracted state, and the hook block 7 is stored in contact with the boom tip 4d from the crane storage position (the state shown by the chain line in FIG. 1) to the working position (the state shown by the solid line in FIG. 1). (State) will be described. In the crane in the retracted position, the left and right outrigger devices 1a and 1b are stored in the most reduced state, and the hook block 7 is stored in the abutting state in contact with the boom tip 4d. The switches 16a and 16b (lift detection switches 16a and 16b) are both off (the state shown in FIG. 1). For this reason, when the main switch 13 is turned on, the pressure switches 16a and 16b are off, so that the relays 20 and 21 are switched to the b contacts 20b and 21b in a non-energized state. For this reason, a circuit of the power supply 12, the main switch 13, the b contact 20b of the relay 20, the b contact switch 19b of the relay 19, the b contact 21b of the relay 21, and the alarm relay 22 is formed. At this time, the hook overwind detection switch 10a1 Since the relay 19 is off and the relay 19 is not energized, the b-contact switch 19b is turned on, the alarm relay 22 is energized, the b-contact switch 22b is turned off, and the alarm buzzer 23 is maintained in the non-alarm state. I have. For this reason, unnecessary warning when the crane is shifted to the working posture, which has conventionally been a problem, is eliminated, and the crane operation can be started without generating noise even in a quiet residential area. The warning is controlled by detecting whether one of the outrigger devices 1a and 1b is grounded and the pressure switches 16a and 16b are turned on, or the hook block 7 is lowered below the overwind position S and the hook is overwound. This is continued until the switch 10a1 is turned on, and unnecessary alarms are effectively regulated. Note that this restriction state of the alarm is the restriction of the hook over-winding alarm in claim 1, and the pressure switch 16a, 16b detects that both the left and right outrigger devices 1a, 1b are not installed. It constitutes an installation state detecting means.
[0027]
Next, a description will be given of a case where the hook block 7 is wound up to the overwind position S and is overwound while the left and right outrigger devices 1a and 1b are installed and a crane operation is performed. First, during the crane operation with the hook block 7 in the non-overwound state, the left and right outrigger devices 1a, 1b are installed and the hook block 7 is lowered below the overwind position S, so that the pressure switches 16a, 16b and the hook The winding detection switches 10a1 are both on. For this reason, the relays 20 and 21 are energized and the c contacts 20c and 21c are switched to the a contacts 20a and 21a, respectively, and the power supply 12, the main switch 13, the a contact 20a of the relay 20, the a contact switch 19a of the relay 19, A contact 21a of the relay 21 and a circuit of the alarm relay 22 are formed (the state shown in FIG. 2). At this time, the hook overwind detection switch 10a1 is on and the relay 19 is energized, so that the a contact switch 19a is turned on, the alarm relay 22 is energized, the b contact switch 22b is turned off, and the alarm buzzer 23 is not alarmed. It is to be maintained in a state. Therefore, the crane can be driven arbitrarily to perform normal crane work.
[0028]
When the hook block 7 is overwound from this state, the hook overwind detection switch 10a1 is turned off and the relay 19 is de-energized, so that the a-contact switch 19a is turned off and the alarm relay 22 is energized. Is cut off, the b-contact switch 22b is turned on, the alarm buzzer 23 is activated, and an alarm is issued. As a result, the worker who has received the warning can easily grasp that the hook block 7 has reached the overwinding state as in the case of the conventional hook overwinding warning, and stop the hoisting motion of the winch device 5 or the like. The hook overwind avoidance operation can be performed promptly.
[0029]
On the other hand, if the outrigger device 1a, 1b (eg, the outrigger device 1a) located on the opposite side to the suspended load becomes overloaded during the crane operation and starts to float, the load pressure of the jack cylinder 15a decreases and the set pressure increases. At this point, the pressure switch 16a is turned off, the corresponding relay 20 is de-energized, and is switched to the b-contact 20b. Therefore, the circuit of the alarm relay 22 is cut off, and the b-contact switch 22b is de-energized. Is turned on, the alarm buzzer 23 is activated, and an alarm is issued. As a result, the worker who has received the warning can easily recognize that the crane has reached the overload state similarly to the conventional lifting warning device, and stop the operation of the crane on the dangerous side, for example. The load avoidance operation can be performed promptly.
[0030]
Next, a case will be described in which the crane operation is completed and the operation shifts to the storage posture. In order to store the crane, the left and right outrigger devices 1a and 1b are first stored. At this time, when the installed state of the left and right outrigger devices 1a and 1b is released (at the time when the outrigger devices 1a and 1b are not installed), the pressure switch 17a is released. , 17b are turned off, the corresponding relays 20, 21 are de-energized and switched to the b-contacts 20b, 21b side, and the power supply 12, the main switch 13, the b-contact 20b of the relay 20, and the b-contact switch 19b of the relay 19 , A contact 21b of the relay 21 and a circuit of the alarm relay 22 are formed (the state shown in FIG. 1). At this time, if the hook block 7 is in the working state (non-over-wound state), the hook over-wind detection switch 10a1 is on, so the b-contact switch 19b of the relay 19 is turned off, and the alarm relay 22 is turned off. As a result, the b-contact switch 22b is turned on, the alarm buzzer 23 is activated, and an alarm is issued. This warning is an unnecessary warning when the crane is shifted to the storage posture, but is released when the hook block 7 is stored as described below. In other words, if the hook block 7 is driven to wind up in the alarm state to make it overwound, the hook overwind detection switch 10a1 is turned off, the relay 19 is de-energized, and the b-contact switch 19b is turned on to turn on the alarm relay. 22 is turned on, the b-contact switch 22b is turned off, and the operation of the alarm buzzer 23 is restricted. For this reason, unnecessary warning is eliminated only by putting the hook block 7 in the retracted state, and the crane can be shifted to the retracted posture without generating noise even in a quiet residential area or the like. The restriction of this alarm is continued until the main switch 13 is turned off, and unnecessary alarms are effectively restricted. Note that this restriction state of the alarm is the restriction of the outrigger lifting alarm in claim 2, and the hook overwind detection switch 10a1 determines that the hook block 7 has been wound up to the winding upper limit position close to the telescopic boom tip 4d. It constitutes a hook non-working position detecting means for detecting.
[0031]
In this embodiment, the hook non-working position detecting means is constituted by the hook overwinding detection switch 10a1. However, if the hook block 7 can detect the non-working state of the hook block 7, for example, the hook block 7 may be connected to the end of the telescopic boom. It may be configured by a hook storage state detection unit that detects a state of contact with the unit 4d and outputs a detection signal.
[0032]
【The invention's effect】
The alarm device for a crane according to the present invention configured as described above can easily provide an unnecessary hook overwinding alarm when the crane is shifted to the working position, or an unnecessary outrigger lifting alarm when the crane is shifted to the retracted position. It has been effectively regulated by adding a simple structure, and even in a quiet residential area, it can perform crane work without worrying about noise, which greatly contributes to the maintenance of the surrounding environment It is.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an alarm device of a crane according to the present invention, and is an explanatory view illustrating an operation at the time of shifting to a working posture or a storage posture.
FIG. 2 is an explanatory view of an alarm device of the crane, illustrating an operation in a working posture.
FIG. 3 is an explanatory view of a conventional crane alarm device.
[Explanation of symbols]
A vehicle mounted crane,
1a, 1b outrigger device,
2 bases,
3 turning post,
4 Telescopic boom,
4a proximal boom,
4b, 4c tip boom,
4d boom tip,
5 winch device,
6 wire rope,
7 hook,
8 undulating cylinder,
9 hook storage device,
10 hook overwind alarm device,
10a hook overwind detecting means,
10a1 Hook overwind detection switch,
10b detection wire,
10c weight for detection,
10d, 23 alarm means,
12 power supply,
13 Main switch,
14. Outrigger lift warning device,
15a, 15b jack cylinder,
16a, 16b pressure switch,
19 relays,
19a a contact switch,
19b b contact switch,
20, 21 relays,
20a, 21a a contact,
20b, 21b b contact,
20c, 21c c contact,
22 alarm relay,
22b b contact,

Claims (2)

A base with left and right outrigger devices that can be installed on the ground, a telescopic boom that is mounted on the base via a swivel post so that it can be raised and lowered, and can be hung up and down freely at the tip of the telescopic boom and not used A hook block that is sometimes stored in contact with the distal end of the telescopic boom, a hook overwind detecting unit that detects that the hook block has been wound up to a winding upper limit position close to the telescopic boom front end, and the hook. In a crane alarm device configured with an alarm unit that issues an alarm based on the detection result of the overwinding detection unit,
Outrigger non-installation state detecting means for detecting that both the left and right outrigger devices are in the non-installation state is provided, and the alarm by the alarm means is regulated when the outrigger non-installation state detection means operates. An alarm device for a crane. A base with left and right outrigger devices that can be installed on the ground, a telescopic boom that is mounted on the base via a swivel post so that it can be raised and lowered, and can be hung up and down freely at the tip of the telescopic boom and not used A hook block that is sometimes stored in contact with the distal end of the telescopic boom, is attached to the left and right outrigger devices, and detects floating at least one of the outrigger devices; In a crane alarm device configured with an alarm unit that issues an alarm based on the detection result of the rising detection unit,
A hook non-working position detecting means for detecting that the hook block has been wound up to a winding upper limit position close to the telescopic boom tip or a contact position in contact with the telescopic boom tip, and detecting the hook non-working position; An alarm device for a crane, characterized in that when the device is activated, the alarm by the alarm device is regulated.

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