JPH0318554Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to wire ropes, particularly irregular strand wire ropes. [Prior art and its problems] As shown in Fig. 2, one type of wire rope is the 1+6 wire rope, which has a round wire δ ₃ with a perfect circular cross section as the core and side wires δ ₂ with irregular cross sections arranged around it.
There is a special wire strand rope (usually referred to as a tough or slough wire rope) that is made up of strands. This rope has a smooth strand surface and a larger effective cross-sectional area than ropes of the same diameter made entirely of round wire, so it has good fatigue resistance, abrasion resistance, and a high cutting load, making it suitable for use in coal mines and mines. Used for hoisting trees, forestry cableways, ski lifts, etc. However, in the above-mentioned conventional irregular strand rope, the core wire tends to break prematurely due to fatigue, and this is difficult to detect because it is internally broken and cannot be seen from the outside, and there is a risk that a delay in detection may lead to a serious accident. [Means for Solving the Problems] The present invention aims to solve the above-mentioned problems and provide this kind of irregular strand wire rope that is less likely to cause early breakage of the core wire and has a long lifespan and is safe. To achieve this objective, the inventors of the present invention have conducted extensive studies and found that the reason internal breakage is more likely to occur in conventional ropes of this type is that the diameter of the core wire is larger than the diameter of the side wires. When used, the diameter of the winding drum and sheave is determined based on the diameter of the outermost layer wire (diameter of the irregularly shaped wire), which creates severe conditions for the core wire, and large bending stress is repeatedly applied to the outer layer wire. We found that the cause of this is that people get tired earlier than normal. Therefore, the present invention changes the idea of conventional irregular strand wire ropes and configures the core wire with a group of small diameter wires to have the required diameter, thereby increasing the drum or sheave diameter/strand diameter of the core wire. In other words, in a wire rope consisting of a strand in which six side wires of irregular cross-section are arranged around a core wire, each wire rope is The core wire of the strand is composed of one small-diameter center wire and six small-diameter side core wires surrounding it. [Examples] Examples of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an enlarged view of the irregular strand wire rope according to the present invention, in which 1 is a hemp core, 2 is six strands twisted around the hemp core 1,
Six side wires δ ₂ each with a core wire and a modified cross section.
It is made up of Such a rope configuration is similar to the conventional one, but in the present invention, each of the strands 2, 2 is not configured with one core wire as in the conventional case, but with a small diameter central wire δ ₀ and its core wire. It has a structure in which six small-diameter side core wires δ ₁ surround the outer periphery. The center wire δ ₀ and the small-diameter core wire δ ₁ are each made of a round wire with a perfect circle in cross section, and the diameters may be the same or slightly different. The results of a performance comparison between a specific example of the rope of the present invention and a conventional rope are shown below. The rope structure is as follows. The proposed product: 6×13 rung Z-twisted 24mm Conventional product: 6×7 rung Z-twisted 24mm The strand structure and strand diameter are shown in Table 1 below.

[Table] Bending fatigue tests were conducted on these ropes. The test conditions were: reciprocating flat piece bending, D/δ (sheave diameter/outer layer strand diameter): 304, rope tension:
8.45tf (safety factor 10), speed: 12.5c/m. The test results are shown in Table 2 below.

[Effect of idea]

According to the present invention described above, in a tough or slough type wire rope consisting of a strand in which six side wires of irregular cross-section are arranged around a core wire, the drum or sheave diameter/strand diameter of the core wire can be adjusted. In order to increase the size, the core wire of each strand is surrounded by one small diameter central wire δ ₀ and 6
Since the core wire is made of small-diameter side core wire δ ₁ , it is possible to reduce the bending stress caused by the sheave and drum and reliably prevent early breakage of the core wire due to bending fatigue. Therefore, the bending radius is relatively small. It has the excellent effect of making equipment such as sheaves and drums smaller and reducing equipment costs.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a modified strand wire rope according to the present invention, and FIG. 2 is a sectional view of a conventional rope. δ ₀ ...Small diameter center wire, δ ₁ ...Small diameter side core wire, δ ₂ ...Side wire with irregular cross section.

Claims (1)

[Scope of utility model registration request] In a wire rope consisting of a strand with six side wires of irregular cross-section arranged around a core wire, the core wire of each strand is separated by one thin wire in order to increase the drum or sheave diameter/strand diameter of the core wire. A unique strand wire rope comprising a diameter center wire δ ₀ and six smaller diameter side core wires δ ₁ surrounding it.