JPH0742353U - Mounting structure of load detector in crane - Google Patents

Abstract

(57) [Summary] [Structure] One load acting end of the load detector 3 arranged in the vicinity of the front end of the boom 1 is pivotally supported on the boom 1, and the width of the boom 1 is located at a lower side near the front end of the boom 1. The guide sheave 13 rotatably supported by a pin 11 extending horizontally in the direction and having a hoisting rope groove 12 on the outer circumference is provided.
The tip end of the hoisting rope 7 hanging from the sheave 4 provided at the tip end of the hook block and wound around the sheave of the hook block is wound around the guide sheave 13 and the other end of the load detector 3 described above. It is connected to the load acting end. [Effect] Since the load detector 3 does not come into direct contact with the ground surface or the like and applies only the rope tension due to the load, it is prevented from being damaged by other external force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a load detector mounting structure in a crane.

[0002]

[Prior art]

 In a jib crane or the like that is equipped with a boom and hoists are suspended from the tip of the boom via a hoisting rope, one load acting end of the jib crane in the width direction of the boom 1 as shown in FIG. The load detector 3 such as a load cell is hung and supported below the boom 1 by connecting it to the boom 1 by a horizontally extending pin 2, and from a sheave 4 provided at the tip of the boom 1. The tip end of the hoisting rope 7 suspended from the sheave 6 of the hook block 5 is attached to the other load acting end of the load detector 3 by a pin 8 extending in the same direction as the pin 2. The load is applied to the boom 1 based on the load detection signal outputted from the load detector 3 or the overload alarm device is activated.

[0003]

[Problems to be solved by the device]

 However, in the above-described load detector mounting structure in the crane, the load detector 3 is suspended below the vicinity of the tip of the boom 1 by the pin 2 that extends horizontally in the width direction of the boom 1. The load detector 3 may touch the ground surface and be damaged when it is tilted.

Since the load detector 3 is connected to the tip of the boom 1 and the tip of the hoisting rope 7 by pins 2 and 8 that extend horizontally in the width direction of the boom 1, the load detector 3 is affected by wind. When the hook block 5 swings in the width direction of the boom 1, a force that bends the load detector 3 in the width direction of the boom 1 may act to damage the load detector 3. There was a problem.

In view of the above situation, the present invention provides a load detector mounting structure in a crane that can prevent damage to the load detector by disposing the load detector in the boom near the boom tip. It was made for that purpose.

[0006]

[Means for Solving the Problems]

 The first invention is to arrange a load detector in the boom near the tip of the boom, pivot one end of the load detector to the boom, and use a pin extending horizontally in the width direction of the boom. The hoisting rope guide member is rotatably supported and has a rope abutting portion capable of abutting a hoisting rope on the outer periphery, and a flange portion formed so as to be connected to both ends of the rope abutting portion. The hoisting rope tip, which is provided below the load detector, is suspended from the sheave provided at the tip of the boom and is wound around the sheave of the hook block. In the second invention, a sheave is applied as the hoisting rope guide member constituting the first invention, after being hung and connected to the other load acting end of the load detector.

[0007]

[Action]

 Therefore, in the present invention, the load detector in the vicinity of the tip of the boom is protected from contact with the obstacle by the boom component, and the lateral force applied by the hoisting rope guide member due to the lateral deflection of the hook block. Is prevented from propagating through the hoisting rope and carries only the hoisting load.

[0008]

【Example】

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

FIG. 1 is a side view showing an outline of a load detector mounting structure in a crane of the present invention. In the figure, the same parts as those in FIG. 2 are designated by the same reference numerals.

In the present embodiment, the link 10 is pivotally supported by a pin 9 extending substantially horizontally in the width direction of the boom 1 on the upper portion in the vicinity of the tip end portion of the boom 1 formed of a steel pipe to detect a load such as a load cell. The load detector 3 is suspended and supported in the vicinity of the tip of the boom 1 by connecting one load acting end of the device 3 to the link 10.

Further, a guide sheave 13 having a hoisting rope groove 12 on the outer circumference is provided on the boom 1 by a pin 11 provided on the lower side near the tip of the boom 1 and extending horizontally in the width direction of the boom 1. It is rotatably supported at a predetermined position on the lower side near the tip.

Further, as in the conventional example shown in FIG. 2, it is suspended from a sheave 4 provided at the tip of the boom 1, and is wound around a sheave 6 of a hook block 5 (not shown in FIG. 1). The tip end of the hoisting rope 7 thus wound is wound around the guide sheave 13 and then connected to the other load acting end of the load detector 3.

When a load is hoisted by operating a hoisting device (not shown) to wind up the hoisting rope 7, the load detector 3 detects the load due to the load through the hoisting rope 7 and a required load detection signal. To send.

According to the above, since the load detector 3 is arranged in the boom 1 near the tip of the boom 1, the load detector 3 is protected from contact with external obstacles such as the ground surface by the components of the boom 1. It

Further, since the hoisting rope 7 is wound around the guide sheave 13 and connected to the load detector 3, the external force in the lateral direction due to the lateral shake of the hook block 5 is passed through the hoisting rope 7. Since the guide sheave 13 blocks the propagation to the load detector 3, the load detector 3 applies only the tension of the hoisting rope 7 due to the hoisting load, and therefore the damage of the load detector 3 can be prevented. .

The present invention is not limited to the above-mentioned embodiment, and the rope contact portion and the rope contact portion on which the hoisting rope can come into contact with the outer periphery formed by the pipe material or the like instead of the sheave. It is of course possible to use a hoisting rope guide member having flange portions formed so as to be connected to both end portions of the above, and various changes can be made without departing from the scope of the present invention. .

[0017]

[Effect of device]

 According to the load detector mounting structure in the crane of the present invention, various excellent effects as described below can be obtained.

I) Since the load detector is arranged inside the boom, it is possible to prevent the load detector from coming into contact with an external obstacle such as the ground surface.

II) Since the tip end of the hoisting rope is wound around the hoisting rope guide part and connected to the load detector, the load detector applies only the rope tension due to the load and receives other external force. There is no.

III) Therefore, damage to the load detector can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an embodiment of an attachment structure of a load detector in a crane according to the present invention.

FIG. 2 is a side view schematically showing an example of a load detector mounting structure in a conventional crane.

[Explanation of symbols]

 1 boom 3 load detector 4 sheave 5 hook block 6 sheave 7 hoisting rope 11 pin 12 hoisting rope groove (rope contact part) (flange part) 13 guide sheave (hoisting rope guide member)

Claims (2)

[Scope of utility model registration request] 1. A load detector is disposed in the vicinity of the tip of the boom, one load acting end of the load detector is pivotally supported on the boom, and the load detector is rotatably pivoted by a pin extending horizontally in the width direction of the boom. A hoisting rope guide member having a rope abutting portion supported by the outer circumference and capable of abutting a hoisting rope and flange portions formed so as to be connected to both ends of the rope abutting portion is provided in the load detector. It is provided so as to be located below, and the tip end of the hoisting rope hanging from the sheave provided at the tip of the boom and wound around the sheave of the hook block is wound around the hoisting rope guide member. A load detector mounting structure for a crane, characterized in that the load detector is connected to the other load acting end of the load detector. 2. The load detector mounting structure for a crane according to claim 1, wherein a sheave is used for the hoisting rope guide member.