CN2197346Y

CN2197346Y - Pulley and guide for door of Twopoint contacting elevator

Info

Publication number: CN2197346Y
Application number: CN 94224682
Authority: CN
Inventors: 文耀平
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-03
Filing date: 1994-08-03
Publication date: 1995-05-17
Anticipated expiration: 2004-08-03

Abstract

The utility model relates to a pulley and guide rail apparatus for a door of a suspension type push-and-pull elevator. Both sides of a pulley groove of the pulley are designed into symmetrical double circular arcs which form two point contacts with the circular arcs on the top surface of the guide rail. Compared with an existing pulley and guide rail apparatus of single point contact type, the pulley and guide rail apparatus of two point contact type has the obvious advantages of big carrying capability, good running performance, and good guiding performance. Thus, the quality and the service life of the door of the elevator are respectively improved and extended.

Description

Pulley and guide for door of Twopoint contacting elevator

The utility model relates to a kind of improved elevator door apparatus, specifically is a kind of two point contact elevator door pulley and track-type facilities.

At present, widely used elevator door is an overhung door, door leaf by suspended on guide rail, pulley adopts single-point to contact with guide track system, be that pulley and guide rail contact portion are single arc grooves, and the arc radius R of sheave utilizes two side flange to play the leading effect greater than the arc radius r of guide rail end face.Between the pulley race of this form and the guide rail tread just single-point contact, the gravity that the pulley bearing counter-force is, thus make the suffered contact stress of pulley and guide rail bigger, load-carrying capacity is little; Because static friction force is little, slippage easily takes place in wheel in rolling process, produce irregular wear, causes the noise and vibration of door simultaneously; Moreover because R〉r, race and guide rail contact point are fixing, along guide rail tread sway, make easily that door rocks, beat even horizontal vibration, and the pulley wear pattern is serious, and lack service life.

The purpose of this utility model provides a kind of improved elevator door apparatus, contacts with the two point of guide rail by pulley, improves its mechanical property, improves its load-carrying capacity, makes elevator door have good operation conditions.

The utility model mainly is to realize by changing the pulley and the structure of guide rail and the mechanical property at the place of being in contact with one another thereof.

As shown in Figure 1, door leaf (4) hangs on the guide rail (2) by pulley (1), and sprocket wheel (3) withstands on guide rail (2) bottom.Analyse and observe shown in Figure 2 according to A-A, pulley (1) is the two point contact with contacting of guide rail (2), race (5) is made up of monosymmetric pair of circular arc, guide rail center of symmetry linear distance e is departed from two centers of circle as the two circular arc R of race among Fig. 3 respectively, contact thereby form two point between two circular arc R of race (5) both sides and guide rail tread circular arc r, β is an angle of contact.

The design of the race of two point contact pulley is mainly angle of contact β,, ratio R/2r, eccentric distance e, wherein β=45 °; R/2r=0.51-0.56; E=(R-r) Sin β.

Pulley can adopt metallic material to make; It is bright and clean wear-resisting that one deck 0.5～1.5mm also can be glued in the circular arc metal surface, and the non-golden material (6) that coefficient of static friction is big is as polyurethane and P.V.C, as shown in Figure 4; Also can all adopt non-metallic material to make.

Guide rail of the present utility model (2) two ends end face is the circular shape of standard, as a among Fig. 5, b, c is the circular arc hollow type, d is the circular arc solid type, adopting thickness is the thick cold rolled thin steel sheet roll-forming of 2-3mm, process through cold-drawn again after the moulding, make its size correctly even, any surface finish, smooth.

The running surface of sprocket wheel of the present utility model (3) is a single arc groove, and race contacts with guide rail bottom circular arc, matches with the pulley on top.Sprocket wheel (3) adopts nylon or oil-resistant rubber material to make.

Adopt the two point contact to compare, following advantage arranged with the single-point contact:

One, load-carrying capacity is big

When contacting as Fig. 3 two point, two two titles that door gravity P acts on guide rail circular arc tread, formed two bearing reaction N ' on the point, and P=2N ' Cos β is because N '＜P=N; So when bearing same load, two point contact pulley bearing counter-force is littler than single-point contact pulley, the suffered contact stress of pulley and guide rail running surface is also less, thereby alleviates wearing and tearing, improves load-carrying capacity.

Simultaneously when single-point contact contacts the pulley geometric diameter with two point and is D, it is D/Cos β that two point contact pulley is amounted to diameter, enlarge 1/Cos β doubly than single-point contact, it is big more to amount to diameter, wheel carrying contact stress is more little, corresponding load-carrying capacity is just big more, and therefore, the geometric diameter of two point contact pulley can be done forr a short time than single-point contact pulley.

Two, drive ability is good

Single-point contact pulley static friction force: F=fp

Two point contact pulley static friction force is similar to the V-slot surface friction, and its equlvalent coefficient of friction is f/Cos β, so F '=fP/Cos β

F ' is arranged〉F, promptly two point contact pulley has bigger friction force, is difficult for sliding phenomenon takes place, and can prevent irregular wear, guarantees that elevator door operates steadily.

Three, the leading performance is good

Two point contact pulley is subjected to the horizontal component of force effect of a pair of bearing reaction at two contact points, has limited the double swerve and the beat of door, makes pulley be in good friction leading state, and steadily leading has been avoided wheel wear, prolongs pulley service life greatly.

Accompanying drawing 1 is the utility model front view.

Accompanying drawing 2 is the utility model A-A cutaway view.

Accompanying drawing 3 is the stressed schematic diagram of the utility model pulley and guide rail contact position.

Accompanying drawing 4 is the utility model pulley arc-shaped surface scheme drawing.

Accompanying drawing 5 is the utility model guide rail cross sectional shape figure.

Embodiment:

Adopt HT200 cast iron to make pulley, it is the solid drawn tube of 12mm that guide rail adopts diameter, and from trial state, the pulley rolling resistance is little, operates steadily, and friction and noise pull very laborsavingly, and operation conditions is good.

Claims

1, a kind of two point contact elevator door pulley and track-type facilities comprise door leaf, pulley, and guide rail and sprocket wheel is characterized in that: pulley race (5) both sides have two circular arc R of symmetry, form two point with guide rail (2) end face circular arc r and contact.

2, according to power 1 described two point contact elevator door pulley and track-type facilities, it is characterized in that: the angle of contact β of the two circular arc lines of two point contact pulley race (5) is 45 °, and R/2r is 0.51～0.56, and eccentric distance e is (R-r) Sin β.

3, according to power 1 or weigh 2 described two point contact elevator door pulley and track-type facilitiess, it is characterized in that: pulley can be made through adopting metallic material, and arc-shaped surface also can be glued the big non-metallic material of one deck coefficient of static friction, also can all adopt non-metal to make.

4, according to power 1 described two point contact elevator door pulley and track-type facilities, it is characterized in that: the two ends end face of guide rail (2) is the circular shape of standard.

5, according to power 1 described two point contact elevator door pulley and track-type facilities, it is characterized in that: the running surface of sprocket wheel (3) is a single arc groove, and race contacts with guide rail bottom circular arc.