CN201530679U

CN201530679U - Crampon double displacement restrictor

Info

Publication number: CN201530679U
Application number: CN2009200831404U
Authority: CN
Inventors: 乔秀坤
Original assignee: MCC CHENGGONG CONSTRUCTION CO Ltd
Current assignee: China MCC5 Group Corp Ltd
Priority date: 2009-08-05
Filing date: 2009-08-05
Publication date: 2010-07-21
Anticipated expiration: 2019-08-05

Abstract

The utility model relates to safety devices of hooks of hoisting equipment. A crampon double displacement restrictor is mainly formed by a boom (1), a counter weight (3) and the like. One end of the boom (1) is connected to a torsion spring, while the counter weight (3) is suspended at the other end. In normal work, the counter weight (3) pulls the boom (1) downwards to overcome torque force of the torsion spring, a switch normally separated contact is closed, and machinery running is normal. When a crampon rises to limit height, a limit stop (4) holds up the counter weight (3), the boom (1) rotates reversely under act of the torque force of the torsion spring, the switch normally separated contact is disconnected, and the crampon stops rising. The counter weight (3) is also sleeved on a hoisting steel wire rope (5) and deviates along with the hoisting steel wire rope with same angles, when reaching the limit height, an angle sensor (8) inside the counter weight (3) outputs signals, and the crampon stops rising. The restrictor has simple structure, and is capable of controlling not only rising height of the crampon, but also deviation angles of the steel wire rope, and effectively guaranteeing safety of the hoisting equipment in hoisting process.

Description

The two limiting devices of load hook

Technical field

The utility model relates to lifting equipment, particularly at the safety device of load hook.

Background technology

In general elevator machinery, load hook directly or by pulley connects with steel cable.During hoisting heavy, crane hoisting mechanism carries out rolling to steel cable, suspension hook is slowly risen and mentions weight, finishes lifting operation.For the hoisting and hanging operation, clearly now fixed in the crane operation rules, forbid that askew skewing hang.But this class violation phenomenon happens occasionally in real work.The machinery of some small-sized lifting mechanisms particularly, as electric block etc., because of its lifting altitude lower, there is deflection just can draw the big drift angle of suspension hook steel cable slightly, very easily cause hoist ceiling crane rope guide and the rising limiting device that links to damage, thus cause steel cable disorderly around or because of the major accident of breaking steel cable out of control that rises.

In present all kinds of elevator machineries, all have rise and falling-threshold position killer, load lifting limiter, and according to the safe limit device of all kinds of different features that turn round, but not to the safe limit device of crane rope angle excursion restriction, the special highly not high minor crane tool of lifting, very easily produce big steel cable drift angle, cause physical damage or cause safety misadventure.

The utility model content

At above-mentioned drawback, the utility model provides a kind of load hook two limiting devices, can control rise height, again may command steel cable drift angle.With reference to shown in Figure 1: this limiting device is made up of torsion spring, arm 1, weight lifting rope 2, weight 3, suspension hook positive stop 4 and angular transducer 8, one end of arm 1 connects torsion spring, weight 3 is hung the other end at arm 1 by weight lifting rope 2, and the gravitational moment of its generation is greater than the torsion of torsion spring.When normal operation, under the effect of gravitational moment, it is downward that weight 3 pulling arms 1 overcome torsion spring torsion, and switch often divides the closing of contact, mechanical normal operation; Positive stop 4 is fixed on the pulley of load hook, when load hook rises to limiting altitude, positive stop 4 can hold up weight 3, and the arm 1 that loses gravitational moment makes progress under the effect of torsion spring torsion, switch often divides contact open, controls hoisting of mechanical stall and suspension hook.In addition, angular transducer 8 is placed in the cavity in the weight 3, and can tilt along with the inclination of weight 3.With reference to shown in Figure 2, there is an annular cutting ferrule 9 weight 3 outsides, weight 3 is enclosed within on the crane rope 5, can be along with the deflection of making equal angular of crane rope 5, crane rope 5 is made slide relative, when deflecting into the extreme angles of setting, angular transducer 8 output signals in the weight 3 move another electric loop immediately, and the control load hook stops to hoist.

The structure of angular transducer 8 and principle: with reference to shown in Figure 3, angular transducer 8 is made of sensor spheroid 84, sensor ball awl 85 and mercury switch.Mercury 86 is housed in the mercury switch glass bulb 81, there are axle center electrode 82 and ring electrode 83 in the middle part, two electrodes do not contact mutually, wherein axle center electrode 82 no matter angular transducer 8 vertically or all insert in the mercury during deflection, ring electrode 83 only just contacts with mercury when angular transducer 8 deflects into and overstep the extreme limit angle; Whole mercury switch is fixed in the sensor spheroid 84, is supported by sensor ball awl 85, and is insulated 87 separations of pad.When sensor during at vertical initial condition, mercury bulb top almost plane and ring electrode plane can be seen parallel to each other, and two planes that are the level of state, and have a gap s, two electrodes to fail conducting.When sensor deflection one low-angle γ, with reference to shown in Figure 4, plane, mercury bulb top still keeps horizontal, and the identical γ of ring electrode 83 deflections angle contacts with mercury, this moment axle center electrode 82 and ring electrode 83 conductings, output control electric signal, control machinery shuts down.

Further mode is, in order to guarantee the tilt limit angle unanimity of crane rope 5 in each direction, the cavity of laying angular transducer 8 in the weight 3 is the revolution bodily form of center shaft on weight 3 center-of-gravitys axis, as cylindrical or taper shape etc., the sensor ball of angular transducer 8 is bored 85 ends and is installed in the taper hole of cavity center below, and can do 360 degree rotations around center shaft; The line of centers of weight lifting rope 2 when slinging weight 3 and the central axes of cavity.

Further mode is, in order to guarantee the sensitivity of angular transducer 8, the center of gravity of whole angular transducer 8 is at deflection sensor spheroid 84 1 ends.

The utility model is simple in structure, can guarantee effectively that weight-lifting equipment is in the lifting process safe.

Description of drawings

Fig. 1. rising limit position control scheme drawing

Fig. 2. limit position, drift angle control scheme drawing

Fig. 3. the angular transducer initial condition

Fig. 4. logical state is touched in angular transducer deflection

Fig. 5. the angular transducer of pre-deflection

Fig. 6. comprise the weight structural representation of angular transducer

The specific embodiment

In mercury switch, mercury bulb pushes up the gap s on plane and ring electrode plane, has determined the size of deflection operating angle γ.Generally speaking, the deflection operating angle minimum of this kind mercury switch can only be accomplished 30 °, and promptly s can not be too little, otherwise when deflection operating angle during less than 30 °, in case touch logical after inversion recovery again, the sticking connection easily takes place with ring electrode in the mercury bulb edge, equipment normally moves after can not guaranteeing to get back to normal angled.In order to realize smaller angle control and to avoid sticking connection, can only select for use and touch current flow angle γ greatly, be that mercury bulb plane, top and ring electrode plane clearance s are bigger, when mercury switch deflects into when touching current flow angle γ, plane, mercury bulb top contacts conducting with the ring electrode horizontal edge, promptly export electric signal control machinery and shut down, play safe limit effect the crane rope angle excursion.Because selected mercury switch than large deflection angle for use, so angular transducer 8 can have a pre-drift angle α, the limit drift angle of crane rope 5 is β, its principle is with reference to shown in Figure 5, mercury switch touch current flow angle γ=alpha+beta.

Fig. 6 is a weight structural representation that comprises angular transducer, and wherein mercury switch has a pre-drift angle α.Weight 3 is by weight body 6, weight lid 7, go between utmost point dish 10, insulation shock absorbing ring 11 and annular cutting ferrule 9 formed down.One cylindrical cavity is arranged in the weight body 6, and cavity top is fixed with weight lid 7, and weight lifting rope 2 is hung weight 3 by weight lid 7; Cavity bottom is fixed with down lead-in wire utmost point dish 10, under utmost point dish 10 centers that go between one round taper hole is arranged, spherical angular transducer 8 is bored 9 angle mounts in cavity by the sensor ball, its top and side contact with the sidewall of cavity with weight lid 7 respectively, the bottom of sensor ball awl 9 is a conical suface, its cone angle is less than the cone angle in the utmost point dish 10 center circle taper holes that go between down, and sensor ball awl 9 contacts with conical suface with the utmost point dish 10 of going between down.The roof of axle center electrode 82 in the mercury switch and sensor spheroid 84, weight body 6 cylindrical cavities and sidewall and weight lifting rope 2 are conductings; Ring electrode 83 with sensor ball awl 9, utmost point dish 10 conductings that go between down, and draw by signal wire (SW) 12.When crane rope deflects into limit drift angle β, the deflection of mercury switch reaches touches current flow angle γ=alpha+beta, mercury switch inner axes electrode 82 and ring electrode 83 conductings, and output control electric signal, control machinery shuts down, and reaches the purpose of safe in operation.

The utility model is not limited to the foregoing description; in design scope of the present utility model; the description of book according to the above description, those of ordinary skill in the art also can make some conspicuous changes, but these changes all should fall within the protection domain of the utility model claim.

Claims

1. two limiting devices of a load hook, it is characterized in that: form by torsion spring, arm (1), weight lifting rope (2), weight (3), suspension hook positive stop (4) and angular transducer (8), one end of arm (1) connects torsion spring, weight (3) is hung the other end in arm (1) by weight lifting rope (2), and the gravitational moment of its generation is greater than the torsion of torsion spring; Positive stop (4) is fixed on the pulley of load hook, and when load hook rises to limiting altitude, positive stop (4) can hold up weight (3); Angular transducer (8) is placed in the interior cavity of weight (3), and can tilt along with the inclination of weight (3); There is an annular cutting ferrule (9) weight (3) outside, and weight (3) is enclosed within on the crane rope (5).

2. according to the two limiting devices of the described load hook of claim 1, it is characterized in that: angular transducer (8) is made of sensor spheroid (84), sensor ball awl (85) and mercury switch; Mercury (86) is housed in the mercury switch glass bulb (81), there are axle center electrode (82) and ring electrode (83) in the middle part, two electrodes do not contact mutually, wherein axle center electrode (82) no matter angular transducer (8) vertically or all insert in the mercury during deflection, ring electrode (83) only just contacts with mercury when angular transducer (8) deflects into and oversteps the extreme limit angle; Whole mercury switch is fixed in the sensor spheroid (84), is supported by sensor ball awl (85), and is insulated pad (87) and separates.

3. according to the two limiting devices of the described load hook of claim 2, it is characterized in that: the cavity of laying angular transducer (8) in the weight (3) is the revolution bodily form of center shaft on weight (3) center-of-gravity axis, and sensor ball awl (85) end of angular transducer (8) is installed in the taper hole of cylindrical cavity central lower; Weight lifting rope (2) when the weight of slinging (3) line of centers and the central axes of cavity.

4. according to the two limiting devices of the described load hook of claim 3, it is characterized in that: the cavity of laying angular transducer (8) in the weight (3) is cylindrical.

5. according to the two limiting devices of the described load hook of claim 3, it is characterized in that: the center of gravity of whole angular transducer (8) is at deflection sensor spheroid (84) one ends.