JPH04313594A - Roll hoisting accessory - Google Patents

Abstract

PURPOSE:To provide a roll hoisting accessory capable of effectively using for an automatic crane. CONSTITUTION:A main body frame 4 of a hoisting accessory is hung with wire ropes 11 from the crane trolley, and is elevatably held with a pair of guide frames 1 hung from a trolley so as to nip the main body frame 4. A pair of nail trucks 12 mutually approachable and separable with a nail truck moving device 15 is provided on the main body frame 4 in its longitudinal direction. A gripping nail 22 composed of a pair of nail pieces 23 is hungly provided on each nail truck 12. The gripping nail 22 is made capable of opening and closing with a nail opening/closing device 26 composed of two links 29, connecting between the nail pieces 23, and a moving means 32 vertically moving the linking parts (shaft 28) of the links 29.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll hoist used for hoisting rolls in automatic cranes and the like.

0002

[Prior Art] Conventionally, in this type of roll hoist, gripping claws are hung at both ends of the hoist body which is suspended from a crane via a wire rope, and these gripping claws are connected to the hoist body side. It is opened and closed by pivoting around the pivot point or by sliding along a rod provided along the width direction of the suspender body. In the former, the gripping claws are attached to mounting members that are movable along the beam, and nuts provided on each mounting member are screwed into threaded portions of screw rods that are pivotally supported along the beam. The gripping claws are moved away from or toward each other by rotation of the screw rod by a motor.

0003

In the former case, the roll hoisting device is suspended from the crane via a wire rope and swings during movement, resulting in poor stopping accuracy of the crane. When changing the suspension point spacing, the accuracy of the crane's stopping will be affected by the play caused by manufacturing errors in the screw rod and nut. Furthermore, if an impact is applied to the gripping claws, there is a risk that the screw rod and the nut may become strained.

Furthermore, in the latter case, the roll hanging device is suspended from the crane via a wire rope, and it sways during movement, resulting in poor stopping accuracy of the crane. Since the structure is such that the gripping claws are slid along the rod to open and close the gripping claws, when lifting a roll, the tips of the gripping claws tend to open due to the gap that exists between the sliding portion of the gripping claws and the rod. Further, when the gripping claws open and close, the rod is easily damaged by the gripping claws, and the gripping claws cannot be opened and closed smoothly and quickly.

[0005] By the way, as a roll hoist for an automatic crane, (1) the lifting point is limited to the roll so that the gripping claw does not open when hoisting the roll diameter part (2) the crane is During normal acceleration/deceleration or abnormal conditions, the roll hoisting device must not move in the direction of the crane's traverse or travel ■When the roll hoisting device is abnormally lowered, the abnormal lowering can be stopped immediately, and at that time, the roll hoisting device must be able to be stopped in an emergency. ■It is possible to prevent rotation of the roll bearing when lifting a roll.■It is possible to move and adjust the suspension point to accommodate a wide variety of rolls.At least the above five requirements are required, and this type of roll lifting device has not been developed yet.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a roll hoist that can be effectively used for automatic cranes.

[0007]

[Means for Solving the Problems] A roll hoist of the present invention includes a pair of guide frames suspended from a trolley of a crane, is held between these guide frames, and is movable up and down from the trolley by a wire rope. A suspended main body frame, a pair of claw carriages provided movably in the longitudinal direction of the main body frame, a gripping claw consisting of a pair of claw pieces pivotally attached to each claw carriage, and the claws of the gripping claws. A pawl opening/closing device comprising two links connecting the pieces and a moving means provided on the pawl truck to move the connecting portion of the links up and down, and a pawl truck moving device for moving the pawl truck. This configuration achieves the above object.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, reference numeral 1 denotes a pair of guide frames formed in the shape of walls, which are suspended from a trolley of a crane and are opposed to each other at a distance in the horizontal direction.

A guide rail 2 is provided on the opposing surface of the widthwise end of the guide frame 1, and a guide rail 3 is provided along the vertical direction on the end surface of the end.

Reference numeral 4 denotes a main body frame formed in a beam shape, and a left-right support roller 5, a front-back support roller 6, and a lifting sheave 7 are rotatably attached to both sides of the longitudinal ends of the main frame. The left-right support rollers 5 and the front-back support rollers 6 are provided in one step in the vertical direction of the main body frame 4. This is to enable the main body frame 4 to tilt while being held between the guide frames 1, as will be described later.

A bogie insertion space 8 penetrating vertically is provided at the longitudinal end of the main body frame 4, and a bogie insertion space 8 is provided above and below the end so as to be located on both sides of the upper and lower openings of the bogie insertion space 8. Rails 9 and 10 are provided along the longitudinal direction of the main body frame 2.

The left-right support rollers 5 are arranged on both sides of the main body frame 4 at intervals in the longitudinal direction of the main body frame 4, and the inner interval is set to the width dimension of the guide frame 1.

Further, the longitudinal support rollers 6 are disposed on both sides of the main body frame 4 at intervals in the width direction of the main body frame 4, and the outer interval is set to the distance between opposing surfaces of the guide frame 1. There is.

A longitudinal support roller 6 is in contact with the guide rail 2 provided on the opposite side of the widthwise end of the guide frame 1, and the main body frame 4 is sandwiched between the guide frames 1 via the longitudinal support roller 6. In addition, left-right support rollers 5 are in contact with guide rails 3 provided on the end faces of the widthwise ends of the guide frame 1, and the main body frame 4 sandwiches the guide frame 1 via the left-right support rollers 5.

In this way, the main body frame 4 is held by the guide frame 1 and can be moved up and down while being guided by the guide frame 1 via the left-right support rollers 5 and the front-back support rollers 6.

A wire rope 11 unwound from a hoisting device on a trolley is hung on the lifting sheave 7 disposed at the four corners of the main body frame 4. The main body frame 4 is suspended from the trolley by this wire rope 11.

Reference numeral 12 denotes a claw truck, and four wheels 13 are provided at the upper end of the end in the direction of movement, and the wheels 13 are provided at the lower end of the end.
Four anti-lifting wheels 14 that form a pair with are rotatably attached.

Upper and lower wheels 13 and 14 provided on a pawl truck 12 are in contact with rails 9 and 10 provided at the upper and lower ends of the longitudinal direction of the main body frame 4, respectively. These wheels 13,1
The claw carriage 12 is movable in the longitudinal direction of the main body frame 4 while holding the main frame 4 therebetween.

Reference numeral 15 denotes a claw carriage moving device, which is constructed as follows. That is, a lever 16 is rotatably supported at the longitudinally intermediate portion of the main body frame 4 via a bearing 17 and a shaft 18, and one claw carriage 12 is attached to the upper end of the lever 16 via a connecting link 19. The other claw truck 12 is connected to the lower end via a connecting link 20.

One end of the lever 16 is connected to the tip of a rod of a drive cylinder 21 provided on the main body frame 4.

The distance from the center of rotation of the lever 16 to the connecting point of the connecting link 19 is equal to the distance to the connecting point of the connecting link 20.

For this reason, the two pawl carts 12 can be moved away from or approached each other by the same amount via the connecting links 19 and 20 by the swinging of the lever 16 due to the rod extension and contraction operation of the drive cylinder 21.

Reference numeral 22 denotes a gripping claw for lifting a roll, and the upper end of a pair of claw pieces 23 is suspended from the lower end of the claw truck 12 by pivoting through a bracket 24 and a shaft 25.
The main body frame 4 can be opened and closed in the width direction centering on the main body frame 4.

Reference numeral 26 denotes a claw opening/closing device, which is constructed as follows. That is, sector gears 27 that mesh with each other are provided at the upper ends of the claw pieces 23 of the gripping claw, and this gear type synchronization mechanism allows the claw pieces 23 to move away from or approach each other by the same amount across the vertical center line.

Two links 29 whose one ends are connected by a shaft 28 are connected to corresponding positions of the lower ends of these claw pieces 23 via a shaft 30 and a bracket 31. The lengths of these two links 29 are set so that the outer dimension of the claw piece 23 falls within the limit dimension when the two links 29 are fully extended to a substantially straight line state.

A rod tip of an opening/closing cylinder 32 suspended from the claw truck 12 is connected to the connection point (shaft 28) of the link 29. This opening/closing cylinder 32 uses a motor cylinder with a trapezoidal threaded rod so as to have a self-locking function. The maximum extension length of the opening/closing cylinder 32 is usually set by a limit switch provided outside the cylinder. The cylinder stroke limit is set by a limit switch provided inside the cylinder.

Reference numeral 33 denotes a bearing holding device, which is constructed as follows. That is, the presser frame 34 is suspended from both ends of the main body frame 4, and the bracket support portion 35 is formed at the lower end of the presser frame 34.

A guide bracket 36 is fitted into the bracket support portion 35 so as to be movable up and down, and is guided and supported by a guide roller 37 rotatably attached to the bracket support portion 35 .

A spring insertion portion 38 that opens upward is bored in the center of the upper end of the guide bracket 36, and the closed end surface of the spring insertion portion 38 and the upper end of the guide bracket 36 are attached to the spring insertion portion. Rod insertion holes 40 and 41 are formed in the fixed plate 39 that closes the opening end surface of the rod 38, respectively.

A guide rod 42 is fitted and supported in these rod insertion holes 40, 41 so as to be movable up and down.

A spring 44 is interposed between a spring receiver 43 wound around the guide rod 42 and formed at the upper end of the guide rod 42 and the closed end surface of the spring insertion portion 38 .

A presser cylinder 45 is suspended from the upper end of the presser frame 34, and the upper end of the guide rod 42 is connected to the rod tip of the presser cylinder 45.

A motor cylinder is used as the opening/closing cylinder 45.

A bearing press roller 47 is rotatably attached to a bracket 46 formed at the lower end of the guide bracket 36.

In this embodiment, an example has been described in which the opening/closing cylinder 32 (motor cylinder) is used as the pawl opening/closing device 26, but the opening/closing means may be, for example, a worm jack.

Furthermore, the bearing holding device 33 is attached to the main body frame 4.
Although an example in which the claw carriage 12 is hung from the end of the claw carriage 12 has been described,
It may also be hung from.

The operation of the hanging tool constructed as above will be explained.

When transporting the roll M, first, the gripping claws 22 provided at both ends of the main body frame 4 are placed directly above the gripping point of the roll M by running the crane and moving the trolley, and then the hoisting claws provided on the trolley The wire rope 11 is unwound from the device to lower the main body frame 4 to the required height, and then the opening/closing cylinder 32 of the pawl opening/closing device 26 is contracted to hold the diameter portion of the roll M at the tip of the pawl piece 23, and the bearing presser 33 holds the bearing C of the roll M. While maintaining this bearing holding state, the main body frame 4 is hoisted up, the crane travels, and the trolley traverses, contrary to the above, to transport the roll M to a predetermined position.

During such conveyance work, the main body frame 4 is held by the guide frame 1 via the left-right support rollers 5 and the front-back support rollers 6, so when the crane is stopped, it does not shake significantly in the traveling and traversing directions. However, when an abnormal load is applied, the guide frames 1 tilt as shown in FIG. This absorbs the shaking energy.

When lifting the roll M, the opening force of the claw piece 23 received from the roll M acts as a tensile force on the opening/closing cylinder 32 via the link 29, but the opening/closing cylinder 32 is self-locking with a motor cylinder using a rod as a trapezoidal screw. Even if the motor or brake is damaged, it will not expand due to the applied tensile force.
The gripping claws 22 do not open due to the roll load.

If an abnormality occurs in the opening/closing cylinder 32 when the gripping claw 22 is opened and the extension of the opening/closing cylinder 32 is not stopped by the normally operating external limit switch, the opening/closing cylinder 32 is stopped at the stroke limit by the internal limit switch. In addition, since the claw pieces 23 are opened until the length of the two links 29 is maximally extended to a substantially linear state, and do not open any further, the gripping claws 22 are within the limit size range.

If the main body frame 4 is lowered abnormally with the gripping claws 22 open, the tip of the rod of the opening/closing cylinder 32 may ride on the roll M, or the tip of the claw piece 23 may hit ground equipment, and the gripping claws may If the main body frame 4 is abnormally lowered with the main body frame 4 closed, the tip of the claw piece 23 will hit the roll M or ground equipment, but at that time, the wire rope 11 suspending the main body frame 4 will Since the tension decreases, by detecting this with a load cell or the like, it becomes possible to emergency stop the abnormal lowering of the main body frame 4. Also, the tip of the rod of the opening/closing cylinder 32 is connected to the roll M, and the tip of the claw piece 23 is connected to the roll M.
When the opening/closing cylinder 32 hits the ground equipment, a compressive or tensile load is applied to the opening/closing cylinder 32, but the opening/closing cylinder 3
You can deal with it by selecting 2.

After the main body frame 4 is lowered and stopped at the required height, the holding claws 22 are closed and at the same time the holding cylinder 45 of the bearing holding device 33 is extended by a predetermined stroke, as shown in FIG. , the guide bracket 36 descends inside the presser frame 34 while being suspended by the presser cylinder 45 via the guide rod 42 and the fixed plate 39, and stops after riding on the upper surface of the roll bearing C via the bearing presser roller 47. The guide rod 42 is pushed into the guide bracket 36, and the spring 44 is compressed by the pushing amount L1. A bearing pressing roller 47 provided at the lower end of the guide bracket 36 is pressed against the upper surface of the roll bearing C by this spring 44. Compression amount L1 of spring 44
is the amount of rise L2 of the claw piece 22 until it supports the roll M.
If the gap between the roll M and the tip of the claw piece 22 is made larger than a predetermined value, the spring 44 will be compressed by L1 - L2 when the roll M is lifted, as shown in FIG. The spring 44 elastically supports the roll bearing C from above via a bearing press roller 47 provided at the lower end of the guide bracket 36. Therefore, since the center of gravity of the bearing of the roll M is located above the center position of the roll, there is no rotation of the roll bearing C, which would be a problem when lifting the roll M. Moreover, even if the roll bearing C slides in the roll axis direction, the bearing presser roller 47 allows the sliding, so that no strain is placed on the bearing presser device 33.

[0045] When changing the hanging point spacing using the claw carriage moving device 15 in accordance with the length of the roll M, the drive cylinder 2
When the lever 16 is extended and retracted to swing the lever 16 around the shaft 18, the two claw carriages 12 are moved onto the rail 9 via the wheels 13 via the connecting links 19 and 20 connected to both ends of the lever 16, respectively. The body frames 4 move away from each other or approach each other by the same amount in the longitudinal direction while being prevented from floating by anti-lifting wheels 14 that come into contact with the rails 10. Therefore, the claw truck 12 is stopped at the hanging point position set by a limit switch, a synchronizer, etc., and a predetermined hanging point interval is obtained.

[0046] When transporting the roll M, the 2
The force acting in the moving direction of the two claw carts 12 is the connecting link 19,
Since the forces that rotate the levers 16 in opposite directions via the levers 20 cancel each other out, no horizontal load is applied to the moving cylinder 21 of the trolley moving device 15 during transportation.

[0047]

[Effects of the Invention] Since the present invention is constructed as described above, the following effects can be obtained.

[0048] The main frame is suspended from the crane's trolley by a wire rope and placed between a pair of guide frames suspended from the trolley, so that it does not sway significantly in the travel and traverse directions when the crane is stopped. This will definitely improve the stopping accuracy of the crane. Moreover, since the main body frame can be stably guided up and down by the guide frame, it is possible to reliably and quickly install the gripping claws provided on the main body frame via the claw truck with respect to the roll.

[0049] By detecting a decrease in the tension of the wire rope suspending the main body frame, abnormal lowering of the main body frame can be stopped as an emergency, and moreover, abnormal lowering of the main body frame can cause the opening/closing means of the pawl opening/closing device to be stopped. Since the vertical compression or tensile load acting on the main body frame can be easily dealt with by selecting the opening/closing means, it is also possible to easily deal with abnormal lowering of the main body frame.

[0050] The two gripping claws are suspended from the claw truck so as to be openable and closable in the width direction of the main body frame, and the distance between the hanging points is adjusted by moving the claw truck, and the hanging points are limited.
A single hanging tool can handle many types of rolls.

[0051] If the claw carriage moving device is constituted by a link mechanism that connects two claw carriages so that they can move away from each other or approach each other, and a drive cylinder that operates this link mechanism, only one driving device is required, and The drive device can be protected from horizontal loads acting on the claw truck during transportation.

[0052] The claw pieces of the gripping claw are connected by two links, and the gripping claws can be kept within the critical dimension range to prevent damage to the gripping claws, and the connection between the two links and the links can be prevented. The gripping claw can be reliably and firmly opened and closed by a toggle mechanism consisting of a moving means that moves the gripper up and down, and
By simply using a motor cylinder or the like as the moving means, it is possible to reliably prevent the gripping claws from opening due to the roll's own weight, making it extremely effective as a roll gripping mechanism.

(2) A main body frame or a claw truck can be used to install a bearing holding device that elastically supports the roll bearing from above. If the bearing holding device is installed, it is possible to prevent rotation of the roll bearing, which is a problem when lifting the roll because the center of gravity of the roll bearing is located above the roll center position.

[0054] Therefore, according to the present invention, a hanging tool can be obtained that satisfies the requirements necessary for use in an automatic crane.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a side view taken along line A in FIG. 1;

FIG. 4 is a side view taken along line B in FIG. 1;

5 is a side view showing the gripping claw of FIG. 3 in a swinging state when an abnormal load is applied; FIG.

FIG. 6 is an enlarged cross-sectional view of a main part of the bearing holding device of FIG. 4 before being lifted;

FIG. 7 is an enlarged cross-sectional view showing a main part of the bearing holding device of FIG. 4 when it is lifted;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Guide frame, 4... Main body frame, 5... Left-right direction support roller, 6... Front-back direction support roller, 11... Wire rope, 12... Claw truck, 15... Claw truck moving device, 16... Lever, 17... Bearing, 18 ...shaft, 19, 20... articulating link, 21... drive cylinder, 22... gripping claw, 23... claw piece, 2
4...Bracket, 25...Shaft, 26...Claw opening/closing device, 27...
Sector gear, 28...axis, 29...link, 30...axis, 31
...Bracket, 32...Opening/closing cylinder, 33...Bearing holding device.

Claims (3)

[Claims] 1. A pair of guide frames suspended from a trolley of a crane, a main body frame held between these guide frames and suspended from the trolley so that it can be raised and lowered by a wire rope, a pair of claw carts provided so as to be movable in the longitudinal direction;
A grasping claw consisting of a pair of claw pieces pivotally mounted on each claw carriage, two links connecting the claw pieces of the grasping claw, and a connecting part of the link provided on the claw carriage and moving the link up and down. A roll hanging tool comprising a claw opening/closing device consisting of a moving means and a claw truck moving device for moving the claw truck. 2. The claw truck moving device comprises a link mechanism that is provided on the main body frame and connects the two claw trucks so that they can move away from each other or approach each other, and a drive cylinder that operates this link mechanism. Item 1. Roll hanging device. 3. The roll hanging tool according to claim 1, further comprising a bearing holding device that is suspended from the main body frame or the claw truck and elastically supports the roll bearing from above.