JPH0229715B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a fluid for a traction type elevator system that is applied to the main rope of a traction type elevator system having a metallic drive sheave and a main rope wound around the sheave. First, the traction of a traction type elevator will be explained with reference to FIGS. 1 and 2. In the figure, 1 is a driving sheave of an elevator hoisting machine (not shown), 1a is a groove thereof, 2 is a deflection wheel, and 3
is a main rope wrapped around the drive sheave 1 and deflection sheave 2; 4 is a cage suspended from one end of these; 5 is a counterweight suspended from the other end. That is, the car 4 and the like are driven via the main rope 3 due to mutual friction between the groove 1a and the main rope 3. The slip limit tension ratio of the main rope 3 is expressed by the following formula. T1/T2=e ^K 〓〓 …Here T1…Tension of the main rope 3 on the car 4 side T2…Tension of the main rope 3 on the counterweight 5 side μ…Coefficient of friction between the groove 1a and the main rope 3 K…Groove Coefficient due to the shape of 1a K=4 (sinγ/2-sinα/2)/γ-α+si
nγ−sinα α...Undercut angle of groove 1a γ...Contact angle of main rope 3 with groove 1a θ...Wrapping angle of main rope 3 with respect to drive sheave 1 Note that the tension ratio T1/T2 is during acceleration and deceleration of the elevator , varies depending on the load conditions and reaches its maximum at full load rise or maximum acceleration during no load fall. For example, W1...Weight of car 4 W...Maximum loaded weight W2...Weight of counterweight 5 W2=W1+W/2 αg...If we consider a system in which the weight of main rope 3, etc. is ignored as the maximum acceleration, at full load rising acceleration T1/ T2=(W1+W)(1+α)/W2(1-α) =(1+W/2W1+W)(1+α/1-α)... During no-load downward acceleration T2/T1=W2(1+α)/W1(1-α)= (1+W/2W1
)(1+α/1-α)... is given by. These, the tension ratio of the equation is
It is necessary to avoid exceeding e ^K 〓〓. However, if the weight of the car 4 is reduced in order to save materials and reduce manufacturing costs, the tension ratio in the equation increases. Furthermore, when the hoist is downsized and the diameter of the drive sheave 1 is reduced in order to save materials and manufacturing costs, the angle θ becomes smaller. Furthermore, in order to increase the safety and reliability of traction, three main ropes and one driving sheave are installed.
In order to improve the durability of the groove, it is necessary to reduce the angle α, and if possible, make the angle α 0°, that is, make the groove 1a a U-groove. For this reason, for a large tension ratio, the coefficient K and the angle θ become small, and the equation e ^K 〓 becomes small, and it is conceivable that the required traction cannot be obtained. This invention solves the above-mentioned drawbacks, and even if the winding angle of the main rope around the driving sheave is small and the groove of the driving sheave is a U-groove, the required traction action can be obtained. It is an object of the present invention to provide a fluid for traction type elevator equipment. An embodiment of this invention will be described below. In order to increase the coefficient of friction μ in order to increase the equation e ^K 〓〓, one of the lubricating oils for the main rope 3 contains squalane, and according to the inventor's experiments, the results shown in the following table were obtained.

【table】

[Table] In other words, squalane is either natural or synthetic, and is a C ₃₀ H ₆₂ hydrocarbon oil and a C ₅ H ₈ isoprene hexamer oligomer. The former is contained in shark liver oil and is made by hydrogenating squalene C ₃₀ H ₅₀ (an acyclic terpene), and the latter is made from geranylacetone synthesized from isoprene.
Diacetylene is ethynylated with diacetylene to produce diacetylene diol, which is then hydrogenated and dehydrated. The lubricating oil for main rope 3 containing squalane is μ
The value is as high as around 0.12, the angle θ is small, and the coefficient K is small, that is, even if the groove 1a is a U groove, the required traction can be obtained. Furthermore, since this lubricating oil has a low evaporation amount and a high flash point, it is possible to lengthen elevator maintenance intervals, and it is safe and easy to maintain, resulting in cost savings. In addition, in order to obtain appropriate fluidity and rust prevention properties, the required friction coefficient μ value can be obtained by adding well-known thickeners and additives. For example, squalane is used as a base oil and 5 to 25% by weight of a high melting point natural or synthetic hydrocarbon wax is added as a thickener, that is, Experimental Example C; Isoprene, etc., to which 1 to 10% by weight of organic sulfonic acid metal salts and amines are added as rust preventive agents, and Zn-dialkyl dithiophenes and naphthalate metal salts as oiliness improvers, that is, Experimental Example D. . Then, the liquid type of Experimental Example B was used for impregnating hemp rope when making the main rope 3, the soft solid type of Experimental Example C was used for the strands of the main rope 3, and the liquid type of Example D If used to supply the main rope 3 after it has been stretched, it will be convenient to handle during each work. Furthermore, when squalane is mixed with a hydrocarbon containing a cyclohexyl ring that has a high friction coefficient μ value but a large amount of evaporation, for example, dicyclohexyl dimethylpentane, the μ value does not decrease, and as in Examples E and F, the hydrocarbon The amount of evaporation can be reduced on an arithmetic average basis. In addition, the lubricating oil of Comparative Example G in the above table, that is, one consisting of a saturated hydrocarbon (C1 to C10) with two substituted cyclohexyl rings and an alkylcycloalkane (alkyl group C1 to C18, alkane C3 to C18), Although a μ value of 0.13 can be obtained, the amount of evaporation is large, maintenance is required more frequently to prevent rust on the main rope, etc., and there are disadvantages in that it requires complicated steps to maintain traction. As explained above, this invention sets the friction coefficient between the main rope and the driving sheave to at least 0.1,
A fluid for traction type elevator equipment in the form of a soft solid with an evaporation amount of 1% or less by weight at 105°C for 8 hours, wherein the fluid contains 75% squalane.
The main rope is coated with a fluid for traction type elevator equipment, which is composed of ~95% by weight and a thickener by 5~25% by weight, and uses a natural or synthetic hydrocarbon wax with a high melting point as the thickener. Therefore, even when the conditions of the traction system are unfavorable, the required traction can be obtained, and this effect can be maintained at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a traction elevator system, and FIG. 2 is a sectional view taken along the line -- in FIG. 1. 1... Drive sheave, 3... Main rope. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Scope of Claims] 1. Coated on the main rope of a traction elevator system having a metallic driving sheave and a main rope wound around the metal driving sheave, the coefficient of friction between the main rope and the driving sheave. is at least 0.1 and the evaporation amount is 105
A fluid for traction type elevator equipment in the form of a soft solid having a weight of 1% or less at 8 hours at ℃, the fluid contains squalane in an amount of 75 to 95% by weight,
A fluid for traction type elevator equipment, characterized in that the thickener is comprised in an amount of 5 to 25% by weight, and a natural or synthetic hydrocarbon wax with a high melting point is used as the thickener. 2. The fluid for a traction-type elevator device according to claim 1, wherein the squalane contains natural squalane or synthetic squalane.