CN2704573Y

CN2704573Y - Progressive two-way safety tongs

Info

Publication number: CN2704573Y
Application number: CN 03209412
Authority: CN
Inventors: 刘文久
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-11
Filing date: 2003-09-11
Publication date: 2005-06-15
Anticipated expiration: 2013-09-11

Abstract

The utility model relates to progressive two-way safety tong, comprising a tong casing and a braking element. The braking element is a cam structure; the cam is installed on the right side of the tong casing by a long pin which is provided with a right cover plate. The flat surface of the cam which is contacted with the tong casing is provided with a drop pit; the other surface of the cam is provided with a short pin shaft hole. The tong casing is provided with a through on the position corresponding to the drop pit; the inner part of the through is provided with a steel ball, a spring and a fastening screw. One half of the steel ball is embedded in the drop pit of the cam, and the other half of the steel ball is arranged in the through hole of the tong casing. A short pin is inserted in the short pin shaft hole of the cam. The short pin between the right cover plate and the cam is provided with a large connecting plate; the right end face of the tong casing is provided with a bent plate which is connected with a small connecting plate by a pin shaft. The small connecting plate is connected with the large connecting plate by another pin shaft; the large connecting plate is provided with a lifting rod by a pin shaft. Through the special design of the braking element and a parallelogram lifting mechanism which is matched with the braking element, the progressive two-way safety tong successfully solves the braking problem of an elevator cabin during ascending and descending; the progressive two-way safety tong makes the operation performance of an elevator safer.

Description

Gradual bidirectional safety tongs

Technical field

The utility model relates to a kind of safety tongs that is used for elevator stopping, specifically, relates to a kind of gradual bidirectional safety tongs.

Background technology

When falling when elevator appearance accident, in order to reduce the infringement that lift car is subjected to as far as possible, protection people's safety of life and property is provided with safety tongs device on car.Its device comprises shift mechanism and safety tongs, and its core component is a safety tongs.Be divided into instantaneous formula and gradual two kinds according to its stop mode.By its use, instantaneous safety is used for Cargo Lift, the gradual elevator that is used for.Progressive safety gear commonly used at present is unidirectional stop safety tongs, is divided into belleville spring, U-shaped spring, π shape spring various ways by its elastic element structure form.Above-mentioned safety tongs is work like this: in the time of when the descending hypervelocity of lift car or because of unexpected falling, elevator overspeed preventer device at first moves, and by the action of speed limiter wire rope drive safety tongs shift mechanism, lift on the stop voussoir of safety tongs or the stop roller and move, wedge shape space between safety tongs and the guide pass is reduced,, produce friction force until stop voussoir or stop roller contact guide pass, make safety tongs clamp guide rail, play the lift car stop effect that makes.

Though above-mentioned safety tongs has solved the descending hypervelocity of lift car or the problem during because of unexpected falling, can't overcome the up hypervelocity of lift car or because of unexpected problem of rushing to summit.

The utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of gradual bidirectional safety tongs that can be used for lift car uplink and downlink stop is provided.

Gradual bidirectional safety tongs described in the utility model comprises pincers housing and braking element.Described braking element is a cam structure, and this cam is installed in the right side of pincers housing by having strong market potential, right cover plate also is installed on having strong market potential.Described cam is provided with pit with the plane that the pincers housing contacts, its another side has the short pin shaft hole, on the pincers housing, has through hole with the corresponding position of pit, steel ball, spring and holding screw are housed in the hole, half of steel ball is embedded in the pit of cam, half places the hole of pincers housing, one short pin is installed in the hole of cam, between right cover plate and cam, on the short pin big connecting plate is installed, bent plate is housed, be connected with little connecting plate by bearing pin in pincers housing right side, little connecting plate is connected with big connecting plate by bearing pin, by bearing pin lifting rod is installed on big connecting plate.

The geometric configuration of described cam is made up of the two parts symmetrical curved surface, each part curved surface comprise respectively in order first face directly, first cambered surface, second is faced directly, second cambered surface.

On first cambered surface, have the groove of indention, face directly at second and offer rectangle braking groove.

The gradual bidirectional safety tongs that the utility model provides by particular design and the parallelogram shift mechanism with matching to braking element, has successfully solved the problem of lift car uplink and downlink brakings, makes the serviceability of elevator more safe and reliable.

The utility model is described in further detail below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is that the gradual bidirectional safety tongs master that the utility model provides looks cutaway view;

Fig. 2 is the vertical view cutaway drawing of Fig. 1;

Fig. 3 is the shape figure of cam;

Fig. 4 is the section-drawing of Fig. 3;

Fig. 5 is the A place enlarged drawing of Fig. 3;

Fig. 6 is that the cam of gradual bidirectional safety tongs described in the utility model rotates counterclockwise the constitution diagram when clamping guide rail, braking when the expression realization is descending;

Fig. 7 is that the cam of the gradual bidirectional safety tongs that provides of the utility model clockwise rotates the constitution diagram when clamping guide rail, and expression realizes braking when up.

The specific embodiment

Referring to Fig. 1, gradual bidirectional safety tongs described in the utility model is the improvement on the basis of existing gradual unidirectional safety tongs.Existing unidirectional safety tongs comprises that pincers housing 4, this housing 4 are that precision cast is shaped, be anchored between the pincers housing 4 elastic element is housed, it is leaf spring 3, the movable voussoir 2 that presses leaf spring 3, be used to limit two countries' elastic clamp ring 5 of two boards spring 3 positions, on movable voussoir 2 elastic cylindrical pin 101 be housed, the jag of elastic cylindrical pin 101 inserts in the slotted hole of left cover 1, to limit the position of movable voussoir 2, make movable voussoir 2 press leaf spring 3 and can only folk prescription to moving.Between right cover plate 9 and pincers housing 4 braking element is housed, this braking element comprises fixedly voussoir, needle roller parts and slide block etc.

The braking element of gradual bidirectional safety tongs described in the utility model is a cam structure, 8 cam 7 and right cover plates 9 is installed on the right side of pincers housing 4 by having strong market potential.Described cam 7 is provided with pit 303 with the plane that pincers housing 4 contacts, and its another side has short pin shaft hole 304.On pincers housing 4, have through hole, steel ball 11, spring 10 and holding screw 102 are housed in the hole with pit 303 corresponding positions.In the normal state, half of steel ball 11 is embedded in the pit of cam 7, and half places the hole of clamping housing 4, is used to limit the position of cam 7.One short pin 6 is installed in the hole of cam 7, and big connecting plate 14 is installed on the short pin 6, between right cover plate 9 and cam 7.In pincers housing 4 right sides bent plate 12 is housed, is connected with little connecting plate 13 by bearing pin 15, little connecting plate 13 is connected with big connecting plate 14 by bearing pin 15.Like this, form parallel-crank mechanism by short pin 6, big connecting plate 14, little connecting plate 13, bent plate 12, on big connecting plate 14, lifting rod 16 is installed by bearing pin, by upper and lower mobile lifting rod 16, can make 7 inverse times of cam or clockwise rotate, solved the problem of lift car uplink and downlink brakings, made the serviceability of elevator more safe and reliable.

Referring to Fig. 2, the geometric configuration of described cam is made up of two parts symmetrical, each part comprises respectively that in order first faces 201, first cambered surface 202, second directly and face 203, second cambered surface 204 directly, on first cambered surface 202, have the groove 301 of indention, see Fig. 5, face directly at second and offer rectangle braking groove 302 on 203.

Progressive safety gear described in the utility model is work like this: this bidirectional safety tongs is installed in the two ends of lift car cross sill, links to each other with the safety tongs shift mechanism by lifting rod 16, and the safety tongs shift mechanism is connected with the two-way speed limiting apparatus.When elevator cage operation exceeds the speed limit, the bidirectional speed limiter device action, the action of manoeuvring safety pincers shift mechanism, the lifting rod 16 that the safety tongs shift mechanism drives bidirectional safety tongs moves up and down, make 7 inverse times of bidirectional safety tongs brake shoe expander or clockwise rotate, and the gap between the guide pass reduces, and the serration arc surface contact guide pass until cam produces friction force, under the friction force effect, cam is rotated further, and eliminates the gap of guide rail both sides, and forces movable voussoir to move, make the leaf spring distortion, generation acts on the positive pressure of movable voussoir, and cam rotation makes to the end faces the contact guide rail directly, sees Fig. 3 and Fig. 4, face the rectangle breaker slot of establishing directly, under the effect of both sides slipper friction force, make safety tongs clamp guide rail, in the skidding distance of regulation, play the effect that makes the lift car stop.

Claims

1, gradual bidirectional safety tongs, comprise pincers housing (4) and braking element, it is characterized in that described braking element is a cam structure, this cam (7) is installed in the right side of pincers housings (4) by have strong market potential (8), right cover plate (9) also is installed on have strong market potential (8), described cam (7) is provided with pit (303) with the plane that pincers housings (4) contact, its another side has short pin shaft hole (304), housings (4) are gone up and the corresponding position of pit (303) has through hole clamping, steel ball (11) is housed in the hole, spring (10) and holding screw (102), half of steel ball (11) is embedded in the pit of cam (7), half places the hole of pincers housings (4), one short pin (6) is installed in the hole of cam (7), between right cover plate (9) and cam (7), on the short pin (6) big connecting plate (14) is installed, in pincers housing (4) right side bent plate (12) is housed, be connected with little connecting plate (13) by bearing pin (15), little connecting plate (13) is connected with big connecting plate (14) by bearing pin (15), goes up at big connecting plate (14) and by bearing pin lifting rod (16) is installed.

2, bidirectional safety tongs according to claim 1, the geometric configuration that it is characterized in that described cam is made up of the two parts symmetrical curved surface, each part curved surface comprise respectively in order first face (201) directly, first cambered surface (202), second is faced (203), second cambered surface (204) directly.

3, bidirectional safety tongs according to claim 2 is characterized in that having the groove (301) of indention on first cambered surface (202), face directly at second and offer rectangle braking groove (302) on (203).