JPS6119191Y2 - - Google Patents

Description

[Detailed description of the invention] The purpose of the invention is to obtain a lightweight rope trolley type bridge crane.

Generally, rope trolley type bridge cranes usually have an auxiliary trolley in addition to the main trolley for suspending the grab bucket for rope compensation and maintenance.

The auxiliary trolley is placed on the cantilever cascade like the main trolley, but in order to ensure a sufficient range of movement for the main trolley, the auxiliary trolley is placed on the part of the cantilever garda that extends to the rear of the crane leg (back crease). Often stored.

However, if there is a structure close to the crane travel path, the back reach cannot be made large, and in that case, the range of movement of the main trolley must be limited.

In any case, since the auxiliary trolley moves horizontally in the same direction as the main trolley, it is necessary to limit the range of movement of the main trolley and to construct a movement path for the auxiliary trolley, which increases the weight of the crane. There was this inconvenience.

The present invention has been made to solve this problem, and is designed to fit along the legs of a bridge crane.
It uses a sheave block that can move up and down in place of the conventional auxiliary trolley. This makes it possible to increase the range of movement of the trolley,
Furthermore, the weight of the crane was also reduced. The embodiments shown in the drawings will be described below.

1 is a grab bucket; support drum 2;
It is suspended by a support rope 4 and an opening/closing rope 5 wound around the opening/closing drum 3, respectively. Reference numeral 6 denotes a trolley that traverses on the girder (not shown) of the bridge type crane, and the trolley 6 is provided with a sheave block, and one end of a traverse rope 9 is attached to one end of the traverse direction. It is attached and wound around the traversing drum 10 via sheaves 8, 8'. The other end of the traversing rope 9 is connected to a moving sheave block support shaft 13 (also described later) via a moving sheave 17 (described later).
The support rope 4, the opening/closing rope 5, and the trolley compensating rope 11 are connected to each other in the direction of attraction. Next, a compensating rope 11 is attached to the other end of the trolley 6, and is wound around a moving sheave block, which will be described later, and its end is fixed to a crane leg. Reference numeral 12 denotes a movable sheave block, and both ends of its support shaft 13 are guided by movable sheave guides 15 provided perpendicularly to the crane legs (indicated by two-dot chain lines) 14, so that it can move up and down. It's summery. And the moving sheave block 12 is
It is suspended between fixed sheave blocks 16, 16' fixed to the crane girder by the support rope 4, the opening/closing rope 5, and the compensating rope 11. Reference numerals 17 and 17' denote movable sheaves and fixed sheaves of the traversing rope 9 that pull down or loosen the movable sheave block 12, and the movable sheave 17 is connected to the support shaft 13 of the movable sheave block by a connecting rod 18. connected. 19 is the machine room of the bridge crane.

Since the present invention is constructed as described above, during cargo handling operations using the grab bucket cart 1, the hoisting and lowering operations of the grab bucket cart 1 are performed by the rotation of the support drum 2 and the opening/closing drum 3, and the opening/closing operation is performed by the opening/closing drum 3. This is done only by the operation of Next, when the grab bucket cart 1 is moved forward (to the left in the figure), the trolley 6 is pulled forward by the transverse rope 9 when the transverse drum 10 is rotated clockwise. Hold the grab bucket 1 and move it forward.

In this case, the sheaves 17, 17' and the transverse drum 1
The transverse rope 9 hanging between 0 and 0 becomes slack,
On the other hand, the compensation rope 11 attached to the trolley 6
is pulled, so that the moving sheave block 12 is pulled upward along the guide 15 by the rope 11. In other words, 1/2 of the travel interval of trolley 6
It will move upward at intervals of . As the trolley 6 moves, the sheave block 7 and the fixed sheave block 16' do not rotate, and only the movable sheave block 12 and the fixed sheave block 16 rotate, so the grab bucket cart 1 changes its hanging height. It will move horizontally without any movement. In addition, when the grab bucket cart 1 is moved rearward in the opposite direction to the above, by the above-mentioned reverse operation,
The hanging height of the grab bucket 1 remains unchanged and it is moved backward.

As described in detail above, the present invention moves the movable sheave block up and down along the crane leg body, thereby eliminating the need for back reach of the crane girder, making it possible to effectively take the range of movement of the trolley. By lowering the center of gravity, it is possible to reduce the amount of balance weight on the legs, and since the crane can be constructed without requiring a back reach, the weight of the crane can be reduced. In addition, by balancing the weights of the movable sheave block and the grab bucket, it is possible to reduce the power required to drive the trolley in traverse motion. The trolley can be moved regardless of its weight, and the effects of this are great, such as extremely good operability, workability, and safety.

[Brief explanation of the drawing]

The drawing is a perspective view of essential parts showing an embodiment of the present invention. 1...Grab bucket, 2...Support drum, 3
... Opening/closing drum, 4... Support rope, 5... Opening/closing rope, 6... Trolley, 7... Sheave block, 9... Traversing rope, 10... Traversing drum, 1
1... Compensation rope, 12... Moving sheave block, 15... Guide.

Claims (1)

[Scope of utility model registration request] A grab bucket support rope 4 and an opening/closing rope 5 are attached to a trolley 6 running on the crane girder.
and a fixed sheave block 16 fixed to the crane girder, and a trolley traverse compensation rope 11,
The rope is sequentially wound around a movable sheave block 12 which is provided to be movable up and down along the crane leg, and further the grab bucket support rope 4 and opening/closing rope 5 are wound around the supporting drum 2 and opening/closing drum 3, respectively.
The end of the trolley traverse compensation rope 11 is fixed to the crane leg, and one end of the traverse rope 9 wound around the traverse drum 10 is connected to the opposite side of the trolley 6 from the trolley traverse compensation rope 11 side, and the other end is fixed to the crane leg. The movable sheave block support shaft 13 is connected via the movable sheave 17 connected below the movable sheave block 12.
The grab bucket support rope 4, opening/closing rope 5, and trolley traverse compensating rope 11 are connected in the direction of attraction, so that the movable sheave block 12 can move up and down following the traverse movement of the trolley 6. A rope trolley type bridge crane characterized by: