JPH09301669A - Crane for conveyance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To convey supportingly articles to be conveyed having different dimensions by a pair of clamp units. SOLUTION: Respective cramp units 13b are movable supported on a clamp unit support frame 12 provided with a pair of clamp units 13b to changr an interval between these clamp units 13b. The respective clamp units 13b are provided with an opening/closing lever 24 for controllably opening/closing clamp arms 14a, 14b in cooperation with the corresponding clamp arms 14a, 14b. An end of the opening/closing lever is connected to a common clamp drive shaft 25 to simultaneously controllably open/close the clamp arms 14a, 14b of the respective clamp units 13b by the clamp drive shaft 25.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a transportation crane.

[0002]

2. Description of the Related Art Conventionally, a pair of clamp units are supported by a clamp unit support frame at a distance from each other, and each clamp unit has a pair of clamp arms, and when the pair of clamp arms is closed. There is known a transport crane that supports a load and releases the load when a pair of clamp arms are opened. This transporting crane is used, for example, to support both ends of a roll shaft of printing paper by a pair of clamp units and transport the printing paper to another place.

[0003]

By the way, in the conventionally used transport crane, the pair of clamp units are fixed to the clamp unit supporting frame, and therefore the interval between the clamp units cannot be changed. Therefore, this transport crane can properly transport the roll shaft when the roll shaft has a fixed length, but when the length of the roll shaft changes, it becomes impossible to support both ends of the roll shaft by the clamp unit. However, there arises a problem that it becomes impossible to convey.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a pair of clamp units are supported by a clamp unit support frame at a distance from each other, and each clamp unit has a pair of clamp arms. In the transport crane that supports the transported object when the pair of clamp arms are closed and releases the transported object when the pair of clamp arms is opened, the interval between the pair of clamp units is changed. The clamp unit support frame movably supports at least a pair of clamp units so that each clamp unit cooperates with the corresponding clamp arm to provide an open / close lever for controlling the open / close of the clamp arm. Connect one end to a common clamp drive shaft and use this clamp drive shaft to control the opening and closing of the clamp arm of each clamp unit. The are to be performed at the same time. That is, the distance between the clamp units is changed according to the size of the conveyed product, and the clamp arms of the respective clamp units are simultaneously controlled by operating the common clamp drive shaft when supporting the conveyed product.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2 showing an overall view of a transportation crane, 1 is a pair of fixed rails and 2 is a fixed rail.
Indicates a pair of movable rails extending laterally with respect to the fixed rail 1, respectively. These moving rails 2 are connected to each other and are supported by the fixed rail 1 via rollers 3 rolling on the fixed rail 1. Therefore, the movable rail 2 can move in the longitudinal direction of the fixed rail 1. On the other hand, an upper frame 4 including a pair of running ends 4a and 4b and a connecting beam part 4c connecting the running ends 4a and 4b to each other is attached to each moving rail 2. Each running end 4a, 4b is supported by the moving rail 2 via rollers 5 rolling on the corresponding moving frame 2, so that the upper frame 4 is movable laterally with respect to the fixed rail 1. .

A pair of wire guide rollers 6a and 6b are attached to the connecting beam portion 4c of the upper frame 4,
The lower ends of the wires 7a and 7b guided by the wire guide rollers 6a and 6b are connected to the lower frame 8. The other ends of the wires 7a and 7b are connected to a winding device (not shown), and therefore the lower frame 8 is moved up and down by the wires 7a and 7b. In addition, a pantograph member 9a for steadying is provided between the upper frame 4 and the lower frame 8.
9b is attached. The upper end of the pantograph member 9a is rotatably connected to the running end 4b, and the lower end of the pantograph member 9a is movably supported by the lower frame 8 in the longitudinal direction of the lower frame 8. The upper end of the pantograph 9b is movably supported by the running end 4a in the longitudinal direction of the fixed rail 1, and the lower end of the pantograph 9b is rotatably connected to the lower frame 8.

Below the lower frame 8, the lower frame 8
A turntable 10 is arranged so as to be rotatable around a vertical axis, and the turntable 10 is rotated by a drive motor 11. A clamp unit support frame 12 supported by the turntable 10 is arranged below the turntable 10, and a pair of clamp units 13a,
13b is supported. Each clamp unit 13a, 13
Each of b has a pair of clamp arms 14a and 14b. For example, both ends of a roll shaft 15 for printing paper have a pair of clamp arms 1a and 13b.
It is supported by 4a and 14b. The clamp unit support frame 12 is movable in the longitudinal direction and the lateral direction of the fixed rail 1, is further movable in the vertical direction, and is rotatable about the vertical axis.

FIG. 3 shows the clamp unit supporting frame 12
4 is a schematic plan view of FIG. 4 and FIG. 4 is an enlarged side view of one clamp unit 13b. The other clamp unit 13a has the same structure as the clamp unit 13b shown in FIG. Referring to FIG. 4, the clamp unit 13 b has a sliding fitting portion 18 in which a guide rail on the side of the clamp unit supporting frame 12 is fitted, so that the clamp unit 13 b is fixed by the clamp unit supporting frame 12. While being supported, it can move in the longitudinal direction of the clamp unit support frame 12. On the other hand, the clamp unit 13a also has a similar sliding fitting portion, so that the clamp unit 13a is also supported by the clamp unit support frame 12 and is movable in the longitudinal direction of the clamp unit support frame 12.

On the other hand, as shown in FIG. 3, a screw rod 16 extends through the central portion of the clamp unit support frame 12, and the screw rod 16 is driven by a drive motor 17. The screw direction of the screw rod 16 located on the clamp unit 13a side, that is, the screw direction of the screw rod 16 in the region A in FIG. 3 is the screw direction of the screw rod 16 located on the clamp unit 13b side, that is, in FIG. The direction is opposite to the screw direction of the screw rod in the area B. Clamp unit 1
A nut member 1 screwed onto the thread of the threaded rod 16 is provided on 3a.
7a is fixed, and a nut member 17b that is screwed with the thread of the screw rod 16 is fixed on the clamp unit 13b. Therefore, when the screw rod 16 is rotated by the drive motor 17, the clamp units 13a and 13b are moved toward each other or away from each other. Therefore, the distance between the clamp units 13a and 13b can be freely changed.

Referring again to FIG. 4, each clamp arm 14
a and 14b are formed in a C shape as a whole and are symmetrically arranged. The outer side of the upper part of each clamp arm 14a and 14b is clamped via a pivot pin 19 to a clamp unit 13a,
It is rotatably attached to the main body 13b. On the other hand, an L-shaped notch 20 having a substantially L-shape is formed inside the upper portion of each clamp arm 14a, 14b. Each clamp arm 14a, 14b is a clamp unit support frame 1
2 are arranged at a slight interval in the longitudinal direction of 2, and the L-shaped notch portion 2 of each clamp arm 14a, 14b is provided.
Roller 2 supported by guide plate 21 between 0
2 is inserted. The upper end of the guide plate 21 is connected to the tip of the opening / closing lever 24 via the pivot pin 23, and the root of the opening / closing lever 24 is connected to the clamp drive shaft 25.

The clamp drive shaft 25 has a spline formed on its outer peripheral surface, so that the opening / closing lever 24 is spline-fitted to the clamp drive shaft 25. That is, the opening / closing lever 24 is connected to the clamp drive shaft 25 so that it can slide in the axial direction but cannot rotate relative to the clamp drive shaft 25. As shown in FIG. 3, the clamp drive shaft 25 extends in the longitudinal direction of the clamp unit support frame 12,
An actuator 26 for controlling the rotation of the clamp drive shaft 25 is connected to an end of the clamp drive shaft 25.

On the other hand, similarly to the clamp unit 13b shown in FIG. 4, the other clamp unit 13a also has a pair of clamp arms 14a and 14b, a guide plate 21, and a roller 2.
2 and an opening / closing lever 24, and the opening / closing lever 24 is also spline-fitted to the clamp drive shaft 25. When the clamp units 13a and 13b are moved in the longitudinal direction of the clamp unit support frame 12, the opening / closing lever 2 of each clamp unit 13a and 13b is moved.
4 moves on the clamp drive shaft 25 in the axial direction together with the clamp units 13a and 13b. Next, when the clamp drive shaft 25 is rotated by the actuator 26, the opening / closing levers 24 of the clamp units 13a and 13b are simultaneously rotated accordingly.

As shown in FIG. 4, the guide plate 21
Is in the upper position, that is, when the roller 22 is engaged with the inner peripheral surfaces of the L-shaped switching portions 20 of the clamp arms 14a, 14b facing each other, the clamp arms 14a, 1
4b is a roller 22 for clamping arms 14a and 14b.
Are urged so that their lower ends overlap each other. That is, at this time, the clamp arms 14a and 14b are closed, so that the roll shaft 15 can be supported by the clamp arms 14a and 14b.

On the other hand, when the clamp drive shaft 25 is rotated so that the opening / closing lever 24 is rotated so that the guide plate 21 is lowered as shown in FIG. 5, the rollers 22 are moved to the clamp arms 14a and 14b. The bottom wall surface of the L-shaped notch portion is pressed downward. As a result, the clamp arms 14a and 14b are opened, and at this time, the roll shaft 15 is released from the clamp arms 14a and 14b.

[0015]

EFFECTS OF THE INVENTION It is possible to support a conveyed product by a pair of clamp units regardless of the size of the conveyed product and convey it to another place. Further, it is possible to simultaneously control the opening and closing of the clamp arms of each clamp unit by using the common clamp drive shaft.

[Brief description of drawings]

FIG. 1 is an overall view of a transportation crane.

FIG. 2 is a side view of FIG.

FIG. 3 is a schematic plan view of a clamp unit support frame.

FIG. 4 is an enlarged side view of the clamp unit showing the clamp arm closed.

FIG. 5 is an enlarged side view of the clamp unit showing a state where the clamp arm is opened.

[Explanation of symbols]

 12 ... Clamp unit support frame 13a, 13b ... Clamp unit 14a, 14b ... Clamp arm 16 ... Screw rod 24 ... Open / close lever 25 ... Clamp drive shaft

Claims (1)

[Claims] 1. A pair of clamp units are supported by a clamp unit support frame at a distance from each other, each clamp unit having a pair of clamp arms, and when a pair of clamp arms are closed, a conveyed product is conveyed. In a transport crane that supports and releases a load when a pair of clamp arms are opened, at least one clamp unit can be moved by a clamp unit support frame so that the distance between the pair of clamp units can be changed. Each of the clamp units is provided with an opening / closing lever that cooperates with a corresponding clamp arm to control the opening / closing of the clamp arm. One end of the opening / closing lever is connected to a common clamp drive shaft and A transport crane that controls the opening and closing of the clamp arms of each clamp unit at the same time.