JPH05172617A - Load test machine of chain block, etc. - Google Patents

Abstract

PURPOSE:To enable load test of a chain to be performed with simple operation and a high efficiency without requiring space and safely by gear-locking one edge and by applying a press load to a middle part of a wire rope which is hooked to a hook such as a chain block which is suspended at a frame body for the other edge with a sieve which is mounted on a tip of a cylinder which is subjected to hydraulic control. CONSTITUTION:A chain block A is suspended at a frame body 1 of a load test machine of a chain block. Then, one edge of a wire rope 6 is hooked to a hook B of the chain block A and then a cylinder 5 is energized, thus enabling the wire rope 6 to be tensioned and at the same time a hydraulic extension force of the cylinder 5 whose hydraulic loading is controlled to be operated to the hook B of the chain block A as a tensile load. Also, when an axis of the cylinder 5 is expanded or contracted according to a head of the chain block A, a load test at upper and lower positions of the head can also be performed easily and positively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load tester for chain blocks (hereinafter abbreviated as "chain block") for carrying out load tests on chain blocks, hippers and the like.

[0002]

2. Description of the Related Art Conventionally, there is no dedicated machine for carrying out a load test of a chain block. Therefore, at a business office where safety inspection is usually conducted, for example, the chain blocks used for about 3 years are collected in one place. A load test was conducted by actually moving an iron material having a weight commensurate with the test load (for example, a weight of 3 ton) up and down according to the lifting height.

[0003]

In the conventional load test, for example, in a chain block having a lifting capacity of 2 tons, the test load is 3
With a ton and a lifting capacity of 3 tons, a large volume of 4.5 tons of iron material is hung, which is troublesome, workability is poor, and a large space is taken. The test with a large volume of iron material suspended had a high risk. It is an object of the present invention to provide a chain block load tester which is easy and efficient, safe, and space-saving.

[0004]

In order to achieve the above object, in a load tester for a chain block according to the present invention, one end is hooked on a frame body for suspending the chain block and the hook of the chain block and the other end. The wire rope is fixed to the wire rope, a cylinder that applies a pressing force to the middle of the wire rope, and a hydraulic control feeding device that controls the pressing force of the cylinder.

[0005]

[Operation] When the chain block is hung on the frame of the load tester for the chain block configured as described above, one end of the wire rope is hooked on the chain block hook, and then the cylinder is urged. Along with the chain block hook, the hydraulic extension force of the hydraulically controlled cylinder acts as a tensile load.
If the cylinder shaft is expanded and contracted according to the lift of the chain block, the load test at the vertical position of the lift can be performed easily and surely.

[0006]

EXAMPLES Examples will be described with reference to the drawings.
In FIGS. 1 and 2, the frame body 1 is made of, for example, grooved steel and is formed into a substantially rectangular parallelepiped shape on the substrate 2. The shackle 3 is formed by connecting an iron bar material into a substantially U-shape and connecting the shackle 3 with the top plate 4 of the frame 1. The cylinder 5 has its base fixed to the substrate 2 and is mounted with its tip side facing upward. One end of the wire rope 6 is hooked on the substrate 2 and wound around a sheave 8 attached to the tip of the expansion / contraction shaft of the cylinder 5, and then further wound around a sheave 9 attached to the substrate 2 so that the other end side is The shackle 3
Hang it on the hook B of the chain block A that is hung on.

A hydraulic control feed device 10 for feeding hydraulic pressure to a cylinder is provided on a base 2, and its configuration will be described with reference to FIG. 3 showing an embodiment.
1, a gear pump 12 is provided, and a relief valve 14 is provided between the gear pump 12 and the electromagnetic switching valve 13 to form a manifold block 15.
6 and the electromagnetic switching valve 13 and the cylinder 5 are also connected to each other by the oil feed pipe line 16. The gauge 17 is attached to the oil feed conduit 19 of the A port block 18 which is technically installed from the oil feed conduit 16. In addition, in this case, the scale of the gauge is 3ton, 4.5ton so that the test load can be read directly.
It is more desirable to change to

Further, in the embodiment shown in FIG. 4, the cylinder 25 is attached to the top plate 24 of the frame body 21 with its tip side facing downward, and in this case, the other end side of the wire rope 26 hooked on the chain block A is the cylinder. After being wound around the sheave 28 attached to the tip of the 25, it is hooked up on the top plate 24 2
7 makes the structure simpler.

[0009]

Since the present invention is constructed as described above, it has the following effects. Each time a load test is performed on a different chain block, it is bulky, heavy, and laborious to handle, eliminating the need for inefficient yet dangerous iron materials to be hung, and the simple work of simply hanging a wire rope on the chain block. It is possible to easily move up and down according to the lift by operating a switch or a relief valve at hand, and a load test can be quickly and safely performed with an arbitrary desired load at an appropriate height position.

[Brief description of drawings]

FIG. 1 is a front view of a load tester for chain blocks.

FIG. 2 is a side view of a load tester for chain blocks.

FIG. 3 is a hydraulic circuit diagram.

FIG. 4 is a front view showing an embodiment in which a cylinder is attached downward.

[Explanation of symbols]

 1, 21 Frame 2 Substrate 3 Shackle 4, 24 Top Plate 5, 25 Cylinder 6, 26 Wire Rope 7, 27 Hook 8, 28 Sheave 9 Sheave 10 Hydraulic Control Feeder 11 Oil Tank 12 Gear Pump 13 Electromagnetic Switching Valve 14 Relief valve 15 Manifold block 16 Oil supply line 17 Gauge 18 A port block 19 Oil supply line A Chain block B Hook

Claims (2)

[Claims] 1. A pressing load is applied by a sheave attached to the tip of a hydraulically controlled cylinder in the middle of a wire rope hooked at one end and hooked at the other end to a hook of a chain block suspended on a frame body. A load tester for chain blocks that is characterized by carrying out a load test. 2. A frame body for suspending a chain block, a wire rope having one end hooked on a hook of the chain block and the other end fixed thereto, and a pressing load is applied between the wire rope by a sheave at the tip. A load tester for chain blocks comprising a cylinder to be applied and a hydraulic control feeding device for controlling the pressing force of the cylinder.