JP2003073069A - Falling prevention device for decking steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a decking steel plate from accidentally falling during loading and unloading operation of the decking steel plate by a lifting magnet device. SOLUTION: This falling prevention device comprises a wire rope 30 attachable to and detachable from the lifting magnet device 40 and two pairs of falling prevention claws 22 disposed longitudinally apart a specified distance from each other and engageable with and disengageable from the right and left end edges of the decking steel plate 4. The device 40 also comprises right and left, operating levers 26 for engaging and disengaging the falling prevention claws 22 manually with and from the decking steel plate 4 and a link mechanism having a link 34 and a rod 31 for interlocking the right and left operating levers to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention device for a floor plate steel sheet, which is used by being installed in a lifting magnet device for the floor plate steel sheet when the floor plate steel sheet is laid in a soft place of the ground.

[0002]

2. Description of the Related Art When temporarily using a heavy vehicle or machine in a soft place of the ground, a steel plate 4 as shown in FIG. 9 is laid on the ground, and the steel plate 4 is placed on the ground. It is used as a passage or a machine is installed on the steel plate 4 of the floor plate. Since the floor plate steel plate 4 must disperse the weight of the vehicle or machine and transmit it to the soft ground, a certain area is required.
Further, the base plate steel plate 4 itself needs to have a strength that does not deform due to the weight of the vehicle or machine. Therefore, for example, the floor plate 4 has a front-rear length of 3 to 6 m and a left-right width of 1.5.
m, a large steel plate having a plate thickness of 22 to 25 mm is used. Therefore, the floor plate steel plate 4 has a mass of 1000 to 20.
The weight is 00 kg.

[0003] Normally, as shown in FIG. 10, the sheet steel plates 4 are stacked and stored in a storage place, and if necessary, they are loaded into a vehicle 1 for transportation and transported to a site of use, where the vehicle 1 is transported. It is loaded and unloaded and laid on the ground. Floor plate Steel plate 4
Must be laid immediately at the required location on the site of use and must be removed promptly after the work is completed.

Conventionally, as shown in FIG. 10, the loading and unloading work of the base plate steel plate 4 is performed by adsorbing the base plate steel plate 4 by a lifting magnet device 3 provided in a working machine such as a hydraulic excavator 2 or a vehicle-mounted crane. It is carried out by loading the vehicle 1 for transportation and unloading it from the vehicle 1. In addition, a hanging hole 5 is provided in the floor plate steel plate 4, and as shown in FIGS. 11 and 12, a hook 7 is hooked on the hanging hole 5 to form a wire rope 8
Using a hydraulic excavator 2 or a vehicle-mounted crane 9 to load the vehicle 1 for transportation, unload it from the vehicle 1, or hang a hanger 6 on a steel plate 4 as shown in FIG.
There is also a case where the vehicle-mounted crane 9 hoists, loads the vehicle 1 for transportation, and unloads it from the vehicle 1.

The former is mainly used for storing the laid plate steel sheet 4, and the latter is often used mainly for use of the laid plate steel sheet 4.

[0006]

When the lifting magnet device 3 is used to attract, load, and unload the floor plate steel plate 4, the lifting magnet device 3 has a sufficient attraction force with respect to the mass of the floor plate steel plate 4. If the safety check at the time of attraction is performed and the power supply of the lifting magnet device 3 such as a battery is sufficiently controlled by using No. 3, the floor plate steel plate 4 will not drop during movement.

However, when the lifting magnet device 3 is loaded and unloaded, the floor plate steel plate 4 is attracted in a horizontal state, so that the floor plate steel plate 4 is bent or deformed, or mud adheres to the attraction surface of the lifting magnet device 3. If a gap is formed between the floor plate and the steel plate 4, the magnetic force to be adsorbed will be insufficient, resulting in an unstable adsorbed state, which may cause an accidental drop.

Therefore, at a work site where safety management is strict, it is required to provide the lifting magnet device 3 with a safety device for preventing the floor plate steel plate 4 from being accidentally dropped. Therefore, as shown in FIG. 14, it is proposed that the lifting magnet device 3 is provided with a mechanical fall prevention device 10 that holds the floor plate steel plate 4 by a pair of left and right facing claws (Japanese Patent Laid-Open No. 08-12243). No.).

However, since the fall prevention device 10 has a structure in which the floor plate steel plate 4 is held by a pair of claws, if the lifting magnet device 3 is not accurately positioned at the center of gravity position G of the floor plate steel plate 4, the attraction force is increased. When it is lost, the floor plate steel plate 4 slides down in the lengthwise direction using the pair of left and right claws as guides. It is difficult to predict the risk range at this time. Further, the fall prevention device 10 has an integral structure with the lifting magnet device 3, and when the pair of claws are operated by the hydraulic actuator, the weight of the hydraulic actuator is added to the lifting magnet device 3, so the lifting magnet device 3 The working range of the hydraulic excavator 2 equipped with the vehicle and the vehicle-mounted crane 9 has a narrow safe working range.
Work becomes restricted.

[0010] This can ensure sufficient safety, and in particular, at a site where the work can be performed without using the fall prevention device 10, it causes a reduction in work efficiency. The present invention is to solve the above problems in a lifting magnet device for a floor plate steel sheet, and can reliably prevent the floor sheet steel plate from being untimely dropped during loading and unloading work of the floor plate steel sheet by the lifting magnet device. It is an object of the present invention to provide a fall prevention device for a floor plate steel sheet that is lightweight and easy to attach to and detach from a lifting magnet device.

[0011]

In order to solve the above-mentioned problems, a fall prevention device for a floor plate steel sheet according to the present invention is provided with a mounting tool that is attachable to and detachable from a lifting magnet device, and is disposed at a predetermined distance before and after the floor plate steel sheet. It has two pairs of fall prevention claws that can be engaged and disengaged on the left and right edges. In this fall prevention device for floor plate steel, when loading and unloading the floor plate steel with a lifting magnet device, two pairs of fall prevention pawls spaced apart by a predetermined distance are attached to the left and right edges of the floor plate steel plate. Since the lifting magnet device is not accurately positioned at the center of gravity, the floor plate steel plate does not slide down in the longitudinal direction when the attractive force is lost. It can be surely prevented from falling.

As a fitting for a fall prevention device for floor plate steel sheet,
If a wire rope that suspends the fall prevention claw from the lifting magnet device is used, it can be easily attached and detached, and can be easily detached and used at a site where the fall prevention device for floor plate steel sheet is unnecessary. By providing the left and right engaging and disengaging means for engaging and disengaging the fall prevention claws with the floor plate steel plate and the link mechanism for interlocking the left and right engaging and disengaging means, it is possible to reduce the weight of the floor plate steel plate fall prevention device and which side of the floor plate steel plate is left or right. Since the engaging and disengaging operation can also be performed from the top, the operability is improved.

[0013]

1 is a plan view of a floor plate steel sheet fall prevention device according to an embodiment of the present invention, and FIG. 2 is a front view showing a state in which the floor plate steel sheet fall prevention device is attached to a lifting magnet device. 3 is a sectional view taken along line AA of FIG. 2, FIG.
4 is a front view of the lever lock, FIG. 5 is a cross-sectional view taken along the line BB of FIG. 4, FIG. 6 is a plan view of a lifting magnet device and a fall prevention device for a floor plate steel plate showing a state where a floor plate steel plate is attracted, and FIG. 7 is a floor plate steel plate. FIG. 8 is a front view of the lifting magnet device and the floor plate steel plate fall prevention device showing a state in which the sheet magnet is attracted, and FIG. 8 is a front view of the lifting magnet device and the floor plate steel plate fall prevention device in a state where the floor plate steel plate is detached.

In this fall prevention device 20 for steel plate, the main frame 21 has two hollow square members 21c in the left-right direction which are parallel to each other, and a front-rear direction which is fixed to the left and right ends of the hollow square member 21c in the front-rear direction. Two hollow square members 21d,
A flat plate 21a connecting the central portions of two hollow square members 21c in the left-right direction, and two hollow square members 21 in the front-rear direction with the flat plate 21a.
Two hollow square members 21c arranged in the left-right direction
It is composed of a hollow square bar 21b that connects the two.

In the lifting magnet device 40 to which the floor plate / steel plate fall prevention device 20 is attached, two lifting magnets 43 are arranged on the lower surface of the balance-like frame 42 at predetermined intervals in the front-rear direction. For this reason, the front-rear spacing of the two hollow square members 21c in the left-right direction of the main frame 21 is set so as to fit between the two lifting magnets 43.

The main frame 21 is provided with a pair of left and right drop preventing pawls 22 at its four corners, that is, the front and rear ends of two hollow square members 21d in the front and rear direction. The fall prevention claw 22 is U-shaped, and has openings facing the left and right edges of the floor plate steel plate 4 so as to engage and disengage, and the central portion of the upper side is rotatably attached to the hollow square bar 21d by a front and rear pin 23. There is. The distance W between the pins 23 of the left and right fall prevention claws 22 is substantially equal to the width of the floor plate steel plate 4.

The tip of the upper side of the fall prevention pawl 22 is attachable to and detachable from the hook portion 45 of the hanging chain 44 of the lifting magnet device 40 via the shackle 29 and the wire rope 30. Further, the front and rear fall prevention claws 22 are connected to each other by a pipe 25 in the front and rear direction provided on the back surface, and the base end of an operation lever 26 for rotating the fall prevention claw 22 at the center of the pipe 25. Parts are installed. A knob 28 is provided at the tip of the operation lever 26.

When the operating lever 26 is erected vertically, the fall preventing pawl 22 can be engaged with the edge of the laying plate steel plate 4 with its opening facing inward. When it is tilted horizontally, the fall prevention pawl 22 is detached from the edge of the base plate steel plate 4 with the opening facing downward. A plate 27 is provided on the pipe 25 in the vicinity of the operation lever 26 and in parallel with the operation lever 26. Also mainframe 2
Below the center of the flat plate 21a of No. 1, the link 34 has the pin 3
It is supported by 8 so as to be horizontally rotatable. The ends of the rod 31 are pivotally attached to the ends of the plate 27 and the links 34 by pins 24 and 35, respectively. The links 34, the pins 38, and the pins 35 are arranged at such a height that they do not project downward from the lifting magnets 43 when the falling plate steel fall prevention device 20 is mounted on the lifting magnet device 40.

The link 34 and the rod 31 constitute a link mechanism for interlocking the left and right operation levers 26, and when one of the left and right operation levers 26 is operated, the other operation lever 26 is also operated. Left and right hollow square members 21 that connect two hollow square members 21c in the left and right direction of the main frame 21
A round bar 39a is mounted between b. This round bar 3
Lever locks 39 are fixedly provided near the left and right ends of 9a. The lever lock 39 has a hook-shaped tip portion, and can lock the operation lever 26 that is horizontally tilted so as not to stand up. The lever lock 39 can also operate the other lever lock 39 by operating either the left or right.

A stopper 39b is horizontally projected near the base end of the lever lock 39, and when the lever lock 39 is disengaged from the operating lever 26, the stopper 39b comes into contact with the hollow square bar 21b so as to be lower than the frame 21. Is prevented from turning. When the laying work of the laying plate steel plate 4 is performed using the lifting magnet device 40 equipped with the laying plate steel plate fall prevention device 20, the operator must perform the operation shown in FIG.
As shown in FIG. 6, the lifting magnet device 40 is positioned on the floor plate steel plates 4 stacked in the storage place as shown in FIG.
As shown in, the front-back direction of the balance-shaped frame 42 is aligned with the length direction of the floor plate steel plate 4. At this time, it is visually checked that the pin 23 of the fall prevention pawl 22 and the left and right end faces of the floor plate steel plate 4 are located on the same vertical plane.

Then, positioning is performed in the front-rear direction so that the center of gravity of the floor plate steel plate 4 is located between the front and rear lifting magnets 43, and the floor plate steel plate 4 is brought into contact therewith. After the contact, the lifting magnet 43 is energized to attract the floor plate steel plate 4, and the lifting magnet device 40 is slightly raised. Next, the operation lever 26 is pushed slightly downward to release the locked lever lock 39, and the operation lever 26 is erected as shown in FIG. 7 so that the openings of the left and right fall prevention pawls 22 face each other. Rotate. This operation can be performed from either the right or left side of the floor plate steel plate 4, as described above.

By rotating the fall prevention claw 22, the mounting portion of the shackle 29 and the lifting magnet device 40 are rotated.
The distance X between the hook portions 45 of the is reduced. In the state where the lifting magnet 43 attracts the floor plate steel plate 4, the main frame 21 of the floor plate steel plate fall prevention device 20 is on the floor plate steel plate 4, so that the wire rope 30 is loosened.

After that, the lifting magnet device 40
The working machine equipped with is moved and the steel plate 4 is transported to the laying place. If the floor plate steel plate 4 is detached from the lifting magnet 43 due to insufficient attraction of the lifting magnet 43 during transportation, as shown in FIG. It is supported and prevented from falling.

After being transported to the laying place, the lifting magnet device 40 is lowered and stopped slightly above the laying position, and the operation lever 26 is tilted horizontally and locked by the lever lock 39. As a result, the fall prevention claw 22 returns to the state of FIG. 2 with the opening facing downward, and is separated from the edge of the floor plate steel plate 4. Therefore, the lifting magnet device 40 is lowered until the floor plate steel plate 4 reaches the laying position, the power supply to the lifting magnet 43 is cut off, and the laying is completed.

In this fall prevention device 20 for floor plate steel plates, two pairs of fall prevention claws 22 which are spaced apart by a predetermined distance in the front and rear are engaged with the left and right edges of the floor plate steel plate 4. Even if the lifting magnet device 40 is not accurately positioned at the center of gravity, the floor plate steel plate 4 does not slide down in the length direction when the attraction force is lost, and it is possible to reliably prevent accidental fall. it can.

The fall prevention device 20 for the floor plate steel plate is used as a mounting tool, and the fall prevention claw 22 is provided with a lifting magnet device 40.
Since the wire rope 30 that is hung from the bottom is used, it is easy to attach and detach, and it is possible to easily remove and work the floor plate steel plate fall prevention device 20 at a site where it is unnecessary. Since the fall prevention claw 22 is engaged with and disengaged from the floor plate steel plate 4 by the manual operation lever 26, the floor plate steel plate fall prevention device 20 does not need a cylinder or the like and is lightweight. Therefore, the fall prevention pawl 22 is transported together with the lifting magnet device 40 in a transportation vehicle. It's easy to do.

Further, since a link mechanism composed of a link 34 and a rod 31 for interlocking the left and right operation levers 26 is provided, the fall prevention pawl 22 can be provided from either the left or right side of the floor plate steel plate 4.
It can be engaged and disengaged and its operability is good. In addition, in the fall prevention device for floor plate steel sheet, the rotation of the fall prevention claw 22 is configured to be manually rotated by operating the operation lever 26 connected to the fall prevention claw 22. May be configured to be rotated by an electric actuator such as an electric motor so that the fall prevention claw 22 is engaged with and disengaged from the floor plate steel plate 4, so that the fall prevention pawl 22 can be electrically operated remotely instead of manually.

[0028]

As described above, the fall prevention device for floor plate steel sheet of the present invention can reliably prevent the floor sheet steel plate from accidentally falling during the loading and unloading work of the floor plate steel sheet by the lifting magnet device. . In addition, it is lightweight and can be easily attached to and detached from the lifting magnet device.

[Brief description of drawings]

FIG. 1 is a plan view of a floor plate steel sheet fall prevention device according to an embodiment of the present invention.

FIG. 2 is a front view showing a state in which a fall prevention device for floor plate steel sheet is attached to a lifting magnet device.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a front view of a lever lock.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a plan view of a lifting magnet device and a floor plate steel plate fall prevention device showing a state in which a floor plate steel plate is attracted.

FIG. 7 is a front view of a lifting magnet device and a fall prevention device for floor plate steel sheet showing a state where a floor plate steel sheet is attracted.

FIG. 8 is a front view of a lifting magnet device and a fall prevention device for floor plate steel sheet showing a state where the floor plate steel plate is detached.

FIG. 9 is a perspective view of a floor plate steel plate.

FIG. 10 is an explanatory diagram of a loading operation using a conventional lifting magnet device.

FIG. 11 is an explanatory diagram of a conventional loading operation.

FIG. 12 is an explanatory diagram of a conventional loading operation.

FIG. 13 is an explanatory diagram of a conventional loading operation.

FIG. 14 is an explanatory diagram of a loading operation by a lifting magnet device including a conventional fall prevention device.

[Explanation of symbols]

1 vehicle 2 hydraulic excavator 3 Lifting magnet device 4 Floor plate steel plate 9 Vehicle-mounted crane 20 Fall Prevention Device for Floor Plates 21 mainframe 22 Fall prevention claws 26 Operation lever 30 wire rope 31 rod 34 links 39 Lever lock 40 Lifting magnet device 42 Balance frame 43 Lifting magnet 44 hanging chain 45 Hook part

Claims (3)

[Claims] 1. A floor plate steel sheet comprising a mounting member which is attachable to and detachable from a lifting magnet device, and two pairs of fall prevention claws which are arranged at a predetermined distance in front and back and are detachable from left and right edges of the floor plate steel sheet. Fall prevention device. 2. The fall prevention device for floor plate steel sheet according to claim 1, wherein the mounting tool is a wire rope for suspending the fall prevention claw from the lifting magnet device. 3. The fall prevention for floor plate steel sheet according to claim 1, further comprising left and right engaging and disengaging means for engaging and disengaging the fall prevention claw with the floor plate steel sheet, and a link mechanism for interlocking the left and right engaging and disengaging means. apparatus.