CN1055642C

CN1055642C - Transmission of fall-slowing device for rescuing from high building

Info

Publication number: CN1055642C
Application number: CN97106629A
Authority: CN
Inventors: 陈大元
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-07-07
Filing date: 1997-09-26
Publication date: 2000-08-23
Anticipated expiration: 2017-09-26
Also published as: CN1183311A

Abstract

The present invention relates to a design of a transmission device of a lifesaving slow landing device for high buildings. A transmission mechanism is composed of an optical shaft and a full steel rope replacing a rope formed by wrapping nylon threads outside a steel core, wherein a thread sleeve is sheathed outside the optical shaft and is provided with a plurality of circles of thread grooves; the steel rope penetrates into the thread sleeve from one opening of the thread sleeve, surrounds the optical shaft along the thread grooves, and then penetrates outside the other opening. Compared with the existing slow landing device, the present invention has the advantages of weight reduction of the transmission rope, volume reduction, initial load decrease, no aging problem of the full steel rope, visual examination of abrasion degree, and timely replacement.

Description

The transmission mechanism of fall-slowing device for rescuing from high building

The present invention relates to the slow descending device of high-building self-help emergency escape, the design of transmission device in specifically a kind of fall-slowing device for rescuing from high building.

Along with China's skyscraper is increasing, how the problem of emergency escape more and more comes into one's own in accidents such as fire, and the design of various escape devices constantly occurs.Chinese patent 95244667.7 disclosed a kind of emergency escape descending lifelines adopt transmission mechanism, speed increasing mechanism and arrestment mechanism, have realized the function of emergency escape preferably, have the advantage that body is in light weight, volume is little, easy to use.The design of its running part is that to adopt core be the rotation that rope and the friction runner of polyamide fibre braid of the aircraft cable outsourcing φ 7.5 of φ 3 is transformed to the rectilinear motion of rope the friction runner, pass to speed increasing mechanism again and be subjected to the control of arrestment mechanism, there are many shortcomings in such transmission mechanism: at first, because the percentage elongation of polyamide fibre and steel wire is different, bearing a heavy burden mainly concentrates on the steel wire rope, the polyamide fibre layer mainly plays frictional drive effect and protective effect, but steel wire rope such as defectiveness, can not find that from the outside diving has harmfulness; Secondly, needs for transmission, this special hoist cable diameter is thick, same load, weight is more than a times of full steel wire rope, and under the architecture storey condition with higher, rope lengths increases, the weight and volume of rope all will increase sharply simultaneously, makes this descending lifeline lose the advantage that body is in light weight, volume is little; Moreover, because gearing adopts the individual pen rope on the friction runner, in order to guarantee enough frictional force, except selecting suitable polyamide fibre layer and runner caulking groove for use, also must give the enough big reverse tensile force of fly rope, therefore the initiating load must be enough big, and the specification that factory announces is defined as 25 kilograms; Also have, the steel core rope is compared with all steel rope, the cost height, and the polyamide fibre of outsourcing is easily aging, inflammable.

The objective of the invention is to adopt all steel rope to design a kind of transmission mechanism of descending lifeline, overcome above-mentioned many defectives.

Technical scheme of the present invention is: a kind of transmission mechanism of fall-slowing device for rescuing from high building, comprise an optical axis and be looped around steel wire rope on the optical axis, optical axis is connected in the speed increasing mechanism of descending lifeline, it is characterized in that on the optical axis that sheathed one is fixed in the thread bush of descending lifeline housing, the thread bush inwall is provided with some circle thread grooves, and an opening that leads to outside the thread bush is respectively established at the thread groove two ends, and steel wire rope penetrates from an opening, be looped around on the optical axis along thread groove, pass from another opening.

Be described further below in conjunction with embodiments of the invention and accompanying drawing thereof.

Fig. 1 is the structural representation of the embodiment of the invention.

Fig. 2 is mechanics principle figure of the present invention.

The transmission mechanism of fall-slowing device for rescuing from high building shown in Figure 1.Comprise an optical axis 1 and be looped around steel wire rope 4 on the optical axis 1, optical axis 1 is connected in the speed increasing mechanism (scheming not shown) in the descending lifeline.Its unique distinction is sheathed one thread bush 2 that is fixed in descending lifeline housing (scheming not shown) on optical axis 1, and thread bush 2 does not rotate, and its inwall is provided with some circle thread grooves 3.An opening that leads to outside the thread bush 2 is respectively established at thread groove 3 two ends, and steel wire rope 4 penetrates from an opening, is looped around on the optical axis 1 along thread groove 3, passes from another opening, and steel wire rope 4 should have certain space with the wall of thread groove 3, is convenient to install steel wire rope.

Substantive features of the present invention are the transmissions that substitute known steel core outsourcing polyamide fibre layer and friction runner with the direct friction transmission between steel wire rope and the optical axis, will not adopt general slow falling in the escape apparatus, be the relative slip that can overcome between steel wire rope and the optical axis so the present invention can adopt.The mechanics principle of its foundation as shown in Figure 2, T1 is a driving force, load when promptly escaping; T2 is reverse tensile force, can adopt conventional add frictional resistance and obtain; Force of periphery when F is the steel wire rope transmission, i.e. the frictional force of steel wire rope and optical axis, dF is its increment; μ is the coefficient of friction of steel wire rope and optical axis; T is the stressed variable of steel wire rope each point on the optical axis, and dT crosses the angle of circumference of optical axis for its increment: α for the steel cable filament winding, and d φ is its increment; DR is a counter-force to steel cable in d φ increment.

F=T1-T2 when poised state, dT=dF=μ dR,

Because of d φ is very little, dR=Td φ, dT=μ Td φ, dT/T=μ d φ,

Through integration

Can get T1/T2=e ^{μ α}

When selecting T2＞T1/e for use ^{μ α}The time, steel wire rope can not skid.The scheme that the present invention adopts multi-turn to be wrapped on the optical axis drives power transmission shaft, promptly not non-slip when taking the scheme of existing raising coefficientoffriction and additional friction power T2 to guarantee transmission, but under the condition of taking enough little coefficientoffriction and additional friction power T2, adopt to increase and twine the number of turns, improve winding angle α value and guarantee reliable transmission.

Operating principle of the present invention is: when escape personnel's body weight acts on the cable wire, cable wire falls downwards, under the effect of frictional force, optical axis rotates, the inner thread groove of thread bush promotes to shift to outlet from inlet successively around the cable wire that respectively encloses of optical axis simultaneously, and the rotation of optical axis is passed to speed increaser and controlled by arrestment mechanism.Suitably select the material of steel wire rope and optical axis for use and, can obtain desirable coefficient of friction and frictional force, can not skid between cable wire and the optical axis around the number of turns of optical axis.

Compare with disclosed escaping descent control device, the present invention has obvious advantage: replace steel core with all steel rope Covering rope, per hundred meters weight can alleviate about 4 kilograms, and that volume is reduced to is original six/ One; The initial load of transmission can be kept to 10 kilograms by original 25 kilograms, broadening the scope of application; All steel The rope cost is also lower, can be high temperature resistant, do not have problem of aging, at every turn with after can check intuitively cable wire The degree of wear, be convenient to timely replacing.

Claims

A kind of transmission mechanism of fall-slowing device for rescuing from high building, comprise an optical axis and be looped around steel wire rope on the optical axis, optical axis is connected in the speed increasing mechanism of descending lifeline, it is characterized in that on the optical axis that sheathed one is fixed in the thread bush of descending lifeline housing, the thread bush inwall is provided with some circle thread grooves, and an opening that leads to outside the thread bush is respectively established at the thread groove two ends, and steel wire rope penetrates from an opening, be looped around on the optical axis along thread groove, pass from another opening.