JP5283856B2 - Power feeding device in crane - Google Patents

Description

  The present invention relates to a power supply cable for supplying electric power between a spreader supported via a head block suspended from a crane trolley traveling on a girder, such as a gantry crane and a portal crane, and the trolley. The present invention relates to a cable storage device that stores a hanging portion.

  FIG. 11 is a front view showing an example of a portal crane 30 that travels in the container yard Y and places the container 39 on the truck or lifts it from the truck 40. The leg portion having the self-propelled tire 31 is shown in FIG. A head block 36 is suspended by a rope 35 from a crane trolley 34 that travels transversely on a girder 33 supported at the upper end of 32, and a container 39 and a guide arm 38 of a spreader 37 supported via the head block 36 While aligning, it is connected and suspended by a connecting tool (twist lock) and loaded onto the truck 40, loaded, or moved to another place.

  The head block 36 is provided with a power feeding cable 41 that is connected to the trolley 34 in order to operate an electric mechanism such as a guide arm 38 or a twist lock provided on the spreader 37.

A cable basket 42 in which a metal pipe is formed in a cage shape is provided on the upper portion of the head block 36, and an excess portion generated as the head block 36 is raised is accommodated in the power supply cable 41. Thus, it is configured to be pulled out from the cable basket 42 (Patent Document 1, Patent Document 2).
JP-A-7-222339 JP-A-7-203626

  The feeding cable is formed in a structure having a curl that naturally spirals so as to be automatically housed along the periphery of the inner surface of the cable basket. However, in recent cranes, in order to increase the efficiency of cargo handling, the cargo handling speed has been increased, and therefore it is difficult for the power supply cable to be wound around the cable basket while winding the toggle at a high speed. .

  Therefore, in Patent Document 1, a pair of guide rollers 4 is provided in accordance with the circular mouth portion of the cable basket 6, and these are driven by a hydraulic motor 14 so as to draw in the power feeding cable. However, since the spreader with the container removed moves up and down at high speed and moves back and forth in accordance with the trolley, it is difficult to drive the guide roller 4 accurately according to the cargo handling speed. This power cable protrudes from the cable basket. When the power supply cable hangs down as described above, an accident occurs in which the power supply cable is sometimes caught by being caught by the spreader or the container and then the spreader is lowered. Accordingly, there is a problem that the cable storage device described in Patent Document 1 cannot perform high-speed cargo handling.

  On the other hand, the invention described in Patent Document 2 eliminates the disadvantages of the invention described in Patent Document 1, and provides a drive rope that interlocks with the rotation of the sheave provided with a pair of guide rollers 4 in the sheave block 2. ing. However, in the case of the cable storage device having this structure, if there is an error in speed between the guide roller 4 and the sheave, or an error in the movement of the feeding cable and the rotation of the sheave, it is still difficult to be smoothly stored in the cable basket. There is. In addition, the apparatus is quite complicated, and has the disadvantages that the cost is high and trouble is likely to occur.

  In a large crane such as a container crane, there is a considerable distance between the trolley part and the sheave block, and it is usually impossible for an operator to easily reach the sheave block part. Therefore, the crane operation must be stopped for a considerable period of time and then repaired.

  An object of the present invention is to solve the problem that a trouble is likely to occur because a conventional cable storage device (power feeding device) employs a complicated mechanism, and a cable is smoothly connected to a cable basket. A guide device using a roller row for guiding is provided.

  In order to achieve the above object, a power feeding device in a crane according to the present invention is configured as follows.

According to the first aspect of the present invention, a head block is supported by a hoisting rope suspended from a trolley of a crane, and a cable basket is provided on the head block for accommodating a power supply cable hanging from the trolley. In a power supply apparatus in a crane that accommodates an excess portion of a power supply cable that is generated when the head block is raised and that has a plurality of guide rollers arranged on the circumference at the entrance of the cable basket, the individual guide rollers are the support shaft is supported, and is characterized in that is inclined obliquely to the annular substrate guide roller installed to also equal to the upper surface of the upper edge of the cable basket is disposed at a height not position .

Sensors invention according to claim 2, wherein while positioned on the upper surface by Riue side of the guide roller, at a position near the outer periphery of the roller guide rows consisting of multiple guide rollers, temporarily stopping the upward movement of the head block It is characterized by providing an annular auxiliary guide having

  In the present invention, a guide roller is annularly arranged in accordance with the upper entrance of the cable basket to form a roller guide row. Therefore, the power supply cable that hangs down as the head block is raised is the roller guide. It is smoothly accommodated in the basket cable while turning along the row.

  Since the power feeding device according to the present invention is not provided with a driving device for driving the guide roller row, the power feeding cable can be accommodated regardless of the moving speed of the power feeding cable.

  Also, by providing an annular auxiliary guide on the outer periphery of the guide roller row, the power supply cable that hangs down without being accommodated in the cable basket is supported by this auxiliary guide, so that it can be prevented from drooping greatly. It is possible to prevent problems such as cutting.

  In addition, the individual rollers constituting the roller guide row can be rotated in the same direction as the spiral so that the cable can be easily turned using the spiral winding rod of the power supply cable. By attaching it at an angle, the power feeding cable can be smoothly stored in the cable basket.

  Furthermore, since the two guide rollers are supported on one frame-shaped support, the guide rollers can be arranged closely and can be guided smoothly regardless of the thickness of the power supply cable.

  1 is a front view showing a state in which the power supply device 1 according to an embodiment of the present invention is suspended by a wire 4, FIG. 2 is a front view of the power supply device 1, FIG. 3 is a plan view thereof, and FIG. 4 is the same side surface.

  The power supply device 1 (a cable storage device configured with a cable basket) is arranged close to one side of the upper surface of the head block 2. Sheaves 3 are provided at the four corners of the head block 2 and are suspended by wires 4 fed out from the trolley 3, and a spreader 5 is connected below the head block 2. Guide arm mechanisms 6 extending in the longitudinal direction and the vertical direction of the spreader 5 are provided at the four corners of the spreader 5.

  The power feeding device 1 is assembled in a cage shape as a whole using a metal pipe, about 60% of the height is a cylindrical portion 1a, and a conical portion 1b is formed above the cylindrical portion 1a. A “guide portion 1c” to be described later is formed.

  As shown in FIG. 5, the guide portion 1c supports the annular substrate 8 by the support plate 7 so as to surround the annular portion 1d forming the upper edge portion of the conical portion 1b. Accordingly, the annular substrate 8 is arranged at a position slightly higher than the upper surface of the conical portion 1b. A large number of guide rollers 9 are provided along the annular substrate 8 with the annular substrate 8 as a base to constitute a guide portion 1c including a roller guide row 9A.

  As shown in FIG. 6, when viewed in plan, the peripheral surface of the guide roller 9 constitutes a guide surface G formed by the surface of the roller protruding slightly inward of the annular portion 1d shown in FIG. Then, the power supply cable 41 passes through the space surrounded by the guide surface G while turning so as to wind the tuna. Note that the feeding cable 41 is preliminarily provided with a curl so that the cable 41 turns spirally along the inner surface of the cable basket.

  FIG. 7A shows a side view of the guide roller 9, and FIG. 7B shows a front sectional view. The guide roller 9 has a U-shape when viewed from the front, and a triangle when viewed from the side. It is supported by the supporting plate 10 that is formed. The guide roller 9 is a set of two, and is supported by a shaft 11 provided laterally on the support plate 10 via a bearing 12.

As can be understood from FIG. 6, the circumference formed by the peripheral surface of the guide roller 9 is located slightly inside the inner diameter 8 a of the annular substrate 8 shown in FIG. The gap in which the power supply cable 41 is fitted is configured as a tight gap that does not exist at all.

  As described above, the feeding cable 41 is provided with a curl so as to form a spiral shape. Therefore, the feeding cable 41 turns in a spiral shape as shown in FIG. It is smoothly accommodated in the cylindrical portion 1a of the cable basket.

  In FIG. 6, the state in which the guide roller 9 is inclined so as to facilitate the spiral turning of the power supply cable 41 is not clearly described, but in reality, the support shaft 11 of the guide roller 9 (FIG. 7). ) Is preferably inclined obliquely with respect to the annular substrate 8.

  FIG. 8 is a side view showing a guide portion 1c with an auxiliary guide, and FIG. 9 is a plan view thereof.

  In the above embodiment, the roller comprises the annular portion 1d at the top of the conical portion 1b, the annular substrate 8 disposed on the annular portion 1d, and a plurality of guide rollers 9 fixed on the annular substrate 8. The guide row 9A is provided to form the guide portion 1c in the same manner as in the above embodiment, but in this embodiment, an annular auxiliary guide 14 is disposed on the outer periphery of the roller guide row 9A. The overall structure of this power supply apparatus is accurately represented in the perspective view of FIG.

  The auxiliary guide 14 is supported by a stay 8 a erected on the annular substrate 8. The auxiliary guide 14 is located slightly above the upper surface of the guide roller 9 and has a larger diameter than the roller guide row 9A.

  In other words, the guide portion 1c in this embodiment has the guide portion of the power supply cable 41 formed in the double of the roller guide row 9A and the auxiliary guide 14 above the power supply device 1 (cable basket).

  In a normal state in which the power supply cable 41 is accommodated, as shown in FIG. 10, the power supply cable 41 is guided along the circumferential surface of the roller guide row 9 </ b> A and is accommodated in the power supply apparatus 1 or can be pulled out while turning.

  However, when for some reason, the power supply cable 41 is supported by the auxiliary guide 14 disposed outside the roller guide row 9A when it is out of the roller guide row 9A and tries to protrude outside the power supply device 1 composed of a cable basket. Will be. The auxiliary guide 14 acts like a kind of brake to prevent the power supply cable 14 from drooping greatly.

  Such a state of the power supply cable 41 is detected by a sensor (not shown) provided along the auxiliary guide 14, and the ascending motion of the head block 2 is temporarily stopped, and the power supply cable 41 itself is vibrated, or The trouble of housing the power supply cable 14 can be solved by slightly lowering the head block 2.

It is a front view of a head block and a spreader on which the power feeding device of the present invention is mounted. It is an enlarged view of the electric power feeder shown in FIG. It is a top view of the electric power feeder shown in FIG. FIG. 3 is a side view of the power feeding device shown in FIG. It is a front view which shows the relationship between the upper part of an electric power feeder, and a roller guide row | line | column. It is a top view of the roller guide row | line | column shown in FIG. Figures (A) and (B) are a side view and a front sectional view of the guide roller. It is drawing of the upper structure of the electric power feeder concerning another Example. It is a top view of the part of FIG. It is a perspective view of the use condition of the device concerning the present invention. It is a front view of a portal crane.

Explanation of symbols

1 Power supply device (cable basket part)
DESCRIPTION OF SYMBOLS 1a Cylindrical part 1b of a power feeding device Conical part 1c Guide part 1d Annular part 2 Head block 3 Sheave 4 Wire 8 Annular substrate 9 Guide roller 9A Roller guide row 10 Support plate 11 Shaft 12 Bearing 14 Auxiliary guide

Claims (2)

The head block is supported by a hoisting rope suspended from a trolley of a crane, and a cable basket is provided on the head block for accommodating a power supply cable hanging from the trolley. The cable basket is raised when the head block is raised. In a power supply apparatus in a crane that accommodates an excess portion of the power supply cable and has a plurality of guide rollers arranged on the circumference at the entrance of the cable basket, a support shaft that supports the individual guide rollers, the power supply device in a crane, characterized in that is inclined obliquely to the cable basket upper part upper surface equal to or or annular substrate guide roller installed which is disposed at a height not position and the. While located on the top surface by Riue sides of the guide rollers, a number of a position close to the roller guide outer circumference of the column consisting of guide rollers, the auxiliary guide ring having a sensor to pause the upward movement of the head block The power feeding device for a crane according to claim 1, wherein the power feeding device is provided.

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