JP2005187193A - Jib crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems in a conventional jib crane wherein a heavy and large-sized carriage supporting columns must be used to prevent an arm from turning over since the crane device is not provided with a counterweight (weight for preventing turning over), a traveling space for the carriage is large, and traveling and operation in a restricted passage are not possible. <P>SOLUTION: This jib crane comprises the arm 3 swingably installed on a main frame 1 vertically installed on a main carriage 2 and a link chain hoist 6 installed on the arm 3. The main frame 1 is divided into upper and lower frames. A rotation restricting means enabling the frame to be rotated about a main column 8 vertically installed on the main carriage 2 in a specified range is installed in the divided part. The main carriage 2 is formed to be attached to and detached from a carriage 16 for preventing turning over on which the weight for preventing the turning over of the crane is mounted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a jib crane, and more particularly to a mobile jib crane provided with a fall prevention means.

2. Description of the Related Art Conventionally, a crane apparatus in which a hoist is provided on one side of an arm that is pivotally provided on a support column and a support member that lifts and lowers a load is known in another example. (For example, see Patent Document 1)
The crane apparatus described in the above-mentioned patent document is provided with a hoist having a drum that can wind up a rope on one of the columns, a trolley that travels on an arm that is provided on the column so as to be rotatable, and is provided on the drum. After the wound rope is hung downward via a first pulley provided on the trolley, the rope is further fixed to an arm via a second pulley provided on the trolley. A pulley is provided, and a support member for supporting a load is provided on the movable pulley, and the load supported by the support member can be moved up and down by winding and unwinding the rope with the drum. It is the thing of the composition which was made.
Utility Model Registration No. 3027081 (2 pages, FIG. 1)

  However, since the above-described conventional crane apparatus does not have a counterweight (a weight for preventing overturning), in order to prevent the arm from overturning, a heavy and large-sized carriage is supported on the carriage supporting the column. Therefore, the traveling space of the carriage becomes large, it becomes impossible to travel and operate in a narrow passage, and the column cannot be divided, so that the loading and unloading of the crane device is restricted. Had the problem of

  Moreover, since there is no means for preventing the dust scattered from the chain or the like from being scattered, the use in a clean room or the like is limited.

  The present invention solves the above-described problems, and includes an arm provided on a main pillar standing on a main carriage so as to be pivotable by a main frame, and a link chain hoisting device installed on the arm. In the provided jib crane, the main frame is divided into upper and lower frames, and the division part is provided with a rotation restricting means that allows the frame to rotate within a certain range with respect to the main pillar erected on the main carriage. Is characterized in that it is detachably connected to a fall prevention carriage equipped with a crane fall prevention weight.

  Further, the rotation restricting means is a stopper provided at the upper end of the main column and a restricting member provided at the upper end of the lower main frame, and abuts against the stopper. It connects with the power supply means provided in the trolley | bogie, It is characterized by the above-mentioned. Furthermore, a cover that covers the link chain is provided between the frame attached to the arm and the bottom plate provided on the lower hook base fixed to the link chain, and the upper part is engaged with the frame between the link chain and the cover. The lower portion is engaged with the bottom plate, and is provided with a plurality of guide bodies that move up and down following the link chain and guide the covering body.

  In the present invention, since the main frame is divided into the lower frame and the upper frame, by separating the upper frame from the lower frame, the jib crane can be easily carried into and out of the work zone, and the cart for preventing the fall is provided. By connecting to the main carriage so as to be removable, and by connecting the fall prevention carriage in the work zone, it is possible to reduce the traveling space of the carriage, to travel in a narrow passage, and to By restricting the rotation range, the hoisting operation by the hoisting device can be performed on the substantially opposite side of the cart for preventing overturning, so that the crane can be operated safely. In addition, by connecting the power plug of the hoisting device to the power supply means of the overturning trolley, it is possible to check the connected state of the main trolley and the overturning trolley, so that the crane can be operated safely and reliably. it can.

  In addition, the cover covering the link chain expands and contracts in a substantially bellows shape between the lowered position and the raised position of the lower hook in a state of covering the link chain in conjunction with the vertical movement of the link chain. Since the lower part is attached to the bottom plate and a plurality of guide bodies that move up and down in conjunction with the link chain are provided, it can be used in a clean room, etc. In operation, even if it contacts the guide body, it does not contact the link chain, so damage to the cover can be prevented, the dead dimension of the lower hook when the lower hook is raised can be reduced, and the cover The stretch rate can be further increased by using a thin material as the base material.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings.

    1 is a front view showing a jib crane according to a first embodiment of the present invention, FIG. 2 is a plan view of a carriage part of FIG. 1, FIG. 3 is a sectional view of a frame connecting part, and FIG. 4 is a front view of FIG. . In FIG. 1, 1 is a main frame, the main frame 1 is divided into upper and lower parts, 1a is a lower frame, and 1b is an upper frame. The lower frame 1a is provided on a main pillar 8 standing and fixed on the carriage 2 so as to be rotatable within a certain range, and an arm 3 is installed on the upper portion of the upper frame 1b. At one end of the arm 3, a hoisting device 5 for the link chain 4 is provided. 7 is an operation switch for operating the hoisting device 5, 8 is a main pillar that is erected and fixed to the carriage 2, and 9 is provided on a lower frame 1 a that is rotatably fitted to the main pillar 8. Slewing rollers that rotate while guiding the peripheral surface of the knives, 10 is an operation handle for slewing that rotates the main frame 1 with respect to the main column 8, 11 is a fixing bolt that fixes the lower frame 1a and the main column 8, and 12 is up and down. A frame connecting portion for connecting the divided frames, 13 is a handle provided at least on the front and side surfaces in the traveling direction of the carriage 2, 14 is a wheel of the carriage 2, and 15 is an outrigger for fixing the carriage 2 to the floor. Thus, four places are provided on the front, rear, left and right of the carriage 2. Reference numeral 16 denotes a fall-preventing carriage equipped with a crane fall-preventing weight 17, and 18 denotes a connecting portion that overlaps and connects the front end of the fall-preventing carriage 16 and the rear end of the main carriage 2, such as bolts and nuts. Etc., so as to be detachable. Reference numeral 19 denotes a handle provided on the fall prevention carriage 16, 20 denotes a relay box as power supply means provided on the fall prevention carriage 16, 20a denotes a power cable for supplying power to the relay box, and 21 denotes a hoisting device. The power plug 22 is a connection table installed at the upper part of the lower frame 1a and the lower part of the upper frame 1b, and both tables are fixed by fixing means. 23 is a flange portion of the connection table 22, 24 is a stopper fixed to the upper part of the main column 8, 25 is a regulating member provided on the lower surface of the connection table 22 of the lower frame 1a, and 26 is a buffer provided on the stopper 24. It is. Two stoppers 24 are provided at an upper portion of the main pillar 8 at an interval of 180 degrees toward the center of the main pillar 8, and the regulating member 25 is opened at 90 degrees so that the entire surface thereof abuts on the stopper 24. It has an eight character shape.

  As described above, in the jib crane of the present embodiment, the main frame 1 is divided into the lower frame 1a and the upper frame 1b, and the upper and lower frames 1a, 1b are fixed by the fixing means in the divided portion. Further, in the dividing portion, the restriction member 25 described above is provided at the lower end of the lower frame 1a, and the frame 1 is rotated within a range until it comes into contact with the stopper 24 provided at the upper end of the main pillar 8. This rotation range is a range in which the load elevating device shown in the second embodiment rotates on the substantially opposite side of the toppling prevention carriage 16. Thus, the arm 3 can be swung within a certain range, and the swivel position can be fixed in the field area in the substantially opposite direction of the toppling prevention carriage.

  In the present embodiment, since the main frame 1 is divided into the lower frame 1a and the upper frame 1b, separating the upper frame 1b facilitates loading and unloading into the jib crane work zone, and the fall prevention cart 16 is The main carriage 2 is detachably connected, and the fall prevention carriage 16 is connected in the work zone, thereby reducing the space for running the carriage, enabling traveling in a narrow passage, and By restricting the rotation range of the arm 3, the hoisting operation by the hoisting device 6 can be performed on the substantially opposite side of the toppling prevention carriage 16, so that the crane can be operated safely. In addition, by connecting the power plug 21 of the hoisting device to the power supply of the overturning carriage 16, the connected state of the main carriage 2 and the overturning carriage 16 can be confirmed, and the crane can be safely and reliably installed. The operation can be performed.

  Hereinafter, another embodiment of the present invention will be described with reference to FIGS. 1, 5, and 6.

  In the figure, the link chain 4 is provided with a lower hook 33 at the lower end, wound around an idle sheave 28, guided by idle sheaves 29 and 30, and wound around a load sheave provided at the hoisting device 5. A frame bottom plate 35 is attached to the lower part of a frame 34 that supports a hoisting device 32 to be described later and is fixed to the lower part of the arm 3. The frame bottom plate 35 is provided with an opening (not shown) through which the link chain 4 and the guide body 31 pass. Also, the frame bottom plate 35 is attached with the upper end of a protective cover 36 that is a cover of the link chain 4 in close contact, and the lower end of the protective cover 36 is a bottom plate fixed to the upper end portion of the lower hook 33. 37 is attached in close contact with the outside of the bottom cylindrical body 38 attached to 37. The protective cover 36 covers the entire suspended portion of the link chain outside the link chain 4. The bottom plate 37 is provided with a locking portion 39 for locking the lower end of the linear body 31 as a guide body. The protective cover 36 is made of a thin material and expands and contracts in a substantially bellows shape. The protective cover 36 covers the link chain 4 along the link chain 4 between the frame bottom plate 35 and the bottom plate 37. Several linear bodies 31 are provided between the link chain 4 and the protective cover 36 so that the hoisting device 32 provided on the frame 34 automatically moves up and down in synchronization with the hoisting and lowering operation of the link chain 4. A tension is always applied in the winding direction by the hoisting device 32. It is preferable to provide four filaments 31. The protective cover 36 expands and contracts in a bellows shape from the lowered position of the lower hook 33 in FIG. The protective cover 36 is expanded and contracted in a substantially bellows shape while preventing contact with the link chain 4 by the guide action of the linear body 31 provided between the link chain 4 and the protective cover 36 during the vertical expansion and contraction operation. Since the protective cover 36 can be prevented from being damaged, and the base of the protective cover 36 can be made of a thin cloth, the dead dimension of the lower hook 33 when the protective cover 36 is contracted can be reduced. Moreover, since the wire body 31 is always tensioned in the winding direction by the hoisting device 32, the wire body 31 is always in tension, and the contact between the link chain 4 and the protective cover 36 is surely prevented. It is possible to prevent the protective cover from being damaged.

  As described above, in the present embodiment, the linear body is a string body, a wire, a piano wire or the like, and the resinous nest yarn is not preferred for sliding with the protective cover, but is a rod-shaped body that expands and contracts up and down. In this case, no hoisting device is required.

  In this embodiment, when the link chain is hoisting, dust is generated due to friction of the link chain, sheave, etc., or even if the oil adhering to the link chain is solid and dust is generated. Falls inside the protective cover, collects in the bottom cylinder, and does not scatter in the room, so that the product can be manufactured with the room kept clean.

  In addition, the present embodiment is preferably applied in a clean room, but can be applied to prevent dust or oil scattering if an overhead traveling crane is installed.

  As described above, according to the present embodiment, the protective cover 36 is substantially bellows between the lowered position and the raised position of the lower hook in a state of covering the link chain 4 in conjunction with the vertical movement of the link chain 4. However, between the link chain 4 and the protective cover 36, the lower part is engaged with the bottom plate 3, and a plurality of guide bodies 31 that move up and down in conjunction with the link chain 4 are provided. Since the cover 36 does not contact the link chain 4 even when it contacts the guide body 31 during the expansion / contraction operation, the protection cover 36 can be prevented from being damaged, and the dead dimension of the lower hook 33 when the lower hook 33 is raised. Can be reduced.

The front view which shows the jib crane of this invention. The top view of a trolley | bogie part. Sectional drawing of a frame connection part. FIG. 4 is a front view of FIG. 3. The front view of a dust scattering prevention apparatus. The side view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main frame 2 Main cart 3 Arm 4 Link chain 5 Hoisting device 7 Operation switch 8 Main pillar 9 Turning roller 10 Turning handle 11 Fixing bolt 12 Frame connecting part 13 Handle 14 Wheel 15 Outrigger 16 Fall prevention cart 17 Counterweight 18 Connecting portion 19 Handle 20 Relay box 20a Power cable 21 Power plug 22 Connecting table 23 Hook 24 Stopper 25 Restricting member 26 Buffer 28 Idle sheave 29 Idle sheave 30 Idle sheave 31 Guide body 32 Hoisting device 33 Lower hook 34 Frame 35 Frame Bottom plate 36 Protective cover 37 Bottom plate 38 Bottom cylinder 39 Locking portion

Claims (4)

  In a jib crane equipped with an arm provided on a main pillar standing on a main carriage so as to be pivotable by a main frame, and a link chain hoisting device installed on the arm, the main frame is connected to the upper and lower main frames. The division part is provided with a rotation restricting means that can rotate within a certain range of the main frame with respect to the main pillar erected on the main carriage, and the main carriage is equipped with a weight for preventing the crane from falling. A jib crane characterized in that it is detachably connected to a trolley.   The jib crane according to claim 1, wherein the rotation restricting means is a stopper provided at an upper end of the main column and a restricting member provided at an upper end of the lower main frame and abutting against the stopper.   3. The jib crane according to claim 1 or 2, wherein the hoisting device power supply is connected to power supply means provided on the overturn prevention cart. Between the frame attached to the arm and the bottom plate provided on the lower hook base fixed to the link chain, a covering body that covers the link chain is provided, and the upper part is engaged with the frame between the link chain and the covering body, The jib crane according to any one of claims 1 to 3, wherein a lower part is engaged with a bottom plate, and a plurality of guide bodies for moving up and down following the link chain to guide the covering body are provided.

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