JP2007276948A - Travel device for crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent rapid starting or rapid stopping of a bridge type crane. <P>SOLUTION: A machine base 9 is provided on a saddle just above a wheel 5, and two pedestals 10 and 11 are disposed on it. A base 12a of an electric motor (geared motor) 12 is supported by the upper pedestal 10, and a bearing base 13a of an intermediate shaft 13 is supported by the lower pedestal 11. A pulley (large) 15 is fixed on an end of the intermediate shaft 13, and an annular belt (V belt) 17 is laid over between the pulley and a pulley (small) 16 attached to an output shaft of the electric motor. A sprocket (small) 19 is fixed on the other end of the intermediate shaft 13, and a transmission roller chain 21 is laid over between the sprocket and a sprocket (large) 20 fixed on an axle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a traveling drive unit such as a bridge crane traveling on a rail.

  When a bridge crane runs on a rail and suddenly starts or stops, it is dangerous that the suspended load swings greatly, and it cannot be unloaded until the swing is settled. Conventionally, in order to prevent the sudden start and stop of the crane, measures such as providing a fluid coupling between the drive motor and the wheel, or controlling the inverter of the drive motor itself have been taken. The effect was not always sufficient.

  An object of the present invention is to provide an inexpensive crane traveling apparatus that can effectively prevent a sudden start or a sudden stop.

  The crane according to the present invention has an electric motor and an intermediate shaft arranged on a traveling device and a saddle, the output shaft of the electric motor and one end of the intermediate shaft are connected by a transmission belt, and the other end of the intermediate shaft is transmitted by an axle attached to the saddle. It connects with a chain (Claim 1). As described above, since the motor and the intermediate shaft are connected by the transmission belt, when a large force is applied, the belt is stretched and the impact is alleviated. As a result, the sudden start and stop of the crane are alleviated, and the swinging of the load can be reduced.

  Since belts are stretched and worn when used, it is sometimes necessary to adjust the belt tension. In this case, since the electric motor and the intermediate shaft are both on the saddle, the adjustment can be easily performed by moving the electric motor a little and moving it away from the intermediate shaft a little.

  The motor is moved by loosening the fixing bolt and pushing the base of the electric motor with the push bolt provided on the pedestal. At this time, the base is slight, but it is easy to rotate in the left and right direction, and tighten the fixing bolt. It is necessary to return to the right direction before. Therefore, the edges are raised so that the base of the motor fits on both sides of the base on which the motor is placed. By doing so, the base is restrained by the edges on both sides when it is pushed with the push bolt, so that it does not rotate, so that the work becomes very easy.

  It is required by law to cover the moving parts of cranes where people are approaching with safety covers. Since the cover is usually made of steel plate and fixed with bolts, it is not easy to remove the safety cover during inspection. Therefore, it is preferable to open a viewing window in the safety cover and cover the window with a transparent material such as an acrylic plate. This is convenient because the interior can be inspected through the window without removing the safety cover.

  FIG. 1 shows a bridge-type crane, and a traveling device 2 is provided at one end of a saddle 1, whereby a wheel is driven to rotate and can travel on a rail 3.

  Details of the traveling device will be described with reference to FIGS. An axle 7 is supported on the saddle 1 via a bearing 6, and a wheel 5 is fixed thereto. A stepped machine base 9 is provided on a saddle directly above the wheel 5, and two bases 10 and 11 are provided thereon. A base 12 a of an electric motor (geared motor) 12 is supported on the upper base 10, and a bearing 13 b of the intermediate shaft 13 is supported on the lower base 11. A pulley (large) 15 is fixed to one end of the intermediate shaft 13, and an annular belt (V-belt) 17 is bridged between the pulley and a pulley (small) 16 attached to the output shaft of the electric motor. A sprocket (small) 19 is fixed to the other end of the intermediate shaft 13, and a transmission roller chain 21 is bridged between the sprocket and a sprocket (large) 20 fixed to the axle.

  With this configuration, the rotation of the electric motor 12 is decelerated via the belt 17 and transmitted to the intermediate shaft 13, and then further decelerated via the transmission chain 21 and transmitted to the axle 7. Thus, the wheel 5 obtains a large torque and runs the crane.

  The tension of the chain and belt is not so critical for the chain, but the belt has a great influence on the torque transmission, so daily adjustment is indispensable. The bases 12a and 13b of the electric motor 12 and the intermediate bearing 13b are fixed to the corresponding bases 10 and 11 with bolts 22 and nuts 23 (FIG. 6). When adjusting the tension of the chain and the belt, loosen the bolts 22 and nuts 23 and adjust the bolts 25 screwed into the blocks 25a so that the bases 12a and 13a are pushed at their tips (see FIG. 2). ). However, since there is a clearance between the bolt hole 26 and the bolt 22, the base rotates slightly in the left-right direction when being pushed by the push bolt. Therefore, conventionally, the base had to be finely adjusted in the correct direction.

  In order to eliminate such trouble, in this case, the edges 27 are raised on both sides of the pedestals 10 and 11 so that the base fits between the edges. In this way, when the bolts 25 are pushed, the bases 12a and 13a are restrained by the edges 27 and move without rotating, so that the tension of the belt and chain can be easily adjusted. Reference numeral 25b denotes a lock nut.

  The motor and the chain are covered with safety covers 29 and 30 as shown in FIGS. FIG. 7 shows a steel box-shaped cover 29 that covers the motor and the intermediate shaft. There is a viewing window 29a on the back of the box, and this window is closed with a transparent acrylic plate 29b. The acrylic plate is supported by a U-shaped frame 29c, and can be pulled up and removed. FIG. 8 shows an oval chain cover 30, which is also made of steel, but has a viewing window 30a at two locations, and the window is covered with an acrylic plate 30b. Since these safety covers 29 and 30 can be seen through the transparent acrylic plate, the movable parts can be inspected without removing the cover, which is convenient.

It is a conceptual diagram of a bridge type crane. It is an elevation view of a traveling part. It is a cross-sectional view of a traveling part. It is a cross-sectional view of an electric motor. It is a perspective view of a base. It is sectional drawing of the base of an electric motor. It is a perspective view of a box-shaped cover. It is a perspective view of a chain cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Saddle 2 Traveling device 5 Wheel 7 Axle 10 Base 12 Electric motor 12a Electric motor base 13 Intermediate shaft 13a Intermediate shaft base 17 Belt 21 Chain 25 Push bolt 27 Edge 29 Box-shaped cover 29a Viewing window 29b Acrylic plate 30 Chain cover 30a Acrylic window 30b Acrylic Board

Claims (3)

  An electric motor and an intermediate shaft are arranged on the saddle, and an output shaft of the electric motor and one end of the intermediate shaft are connected by a transmission belt, and the other end of the intermediate shaft is connected by an axle attached to the saddle and a transmission chain. Crane traveling device.   The traveling of the crane according to claim 1, wherein edges for restraining the base from rotating are raised on both sides of the base on which the base of the electric motor is mounted, and a push bolt for pressing the end of the base is provided on the base. apparatus.   The crane traveling device according to claim 1 or 2, wherein a viewing window is opened in a safety cover that covers the movable part, and the window is covered with a transparent material.

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