CN2077438U - Limiter of elevating capacity - Google Patents

Abstract

The utility model discloses a limiter of elevating capacity which belongs to an independent unit-system device. The utility model is hinged at the lower part of the trolley rack or is hinged at the vicinity of the fixed pulley block of the upper end of the jib rack, and the raising rope branch of the any pulley wheel of the pulley block circles through the pulley wheel system of the pulley block; so the traction force of the rope is changed to the horizontal pressure, and the horizontal pressure is transmitted to a spring dashpot which is provided with a control switch; thereby, when the overload happens, the power cut can be realized. The elevating signal transformation of the utility model has few transferring levels, so the damping and balance supporting function can be realized, and the error which is caused by the component assembly and inertial impact can be reduced. The utility model has the advantages of compact structure, small size, easy adjustment and calibration. The limiter of elevating capacity can be used as the accessory of the complete machine. The utility model can be used by matching with the cranes of various types, in particular, the limiter of elevating capacity can be matched with gantry crane, portal crane, handling bridge, etc.

Description

Limiter of elevating capacity

The utility model relates to a kind of load lifting limiter of hoisting crane.

Load lifting limiter is divided into electron type and mechanical type device.The mechanical type device generally adopts the spring travel of reflection lift heavy signal, makes the electric controling switch action, with cut-out lifting mechanism power supply, and shows alarm signal.The spring that rigidity is bigger, influenced not quite by the lift heavy inertia impact, enough part strength, it and the electron type device that adopts sensor and electronics system to form are compared, the stable type that is showing, the reliability of action and the durability aspect of use more adapt to the service condition and the environment for use of hoisting crane.

But existing mechanical type device, conversion transmission to the lift heavy signal utilizes pulley lever system or pulley system more, raising line pulling force with reflection lift heavy signal, be converted into pressure to spring, structurally can not form independently whole, all will with the fixed pulley on the hoisting crane, assembly relation takes place in equalizer pulley, leading sheave etc., often cause the particular difficulty on installing and adjusting, its contour structure size, non-warp are totally considered, are difficult to find the position and the space that can hold on general hoisting crane, greatly reduce its applicability, at present, only limit to be applied on the hoisting crane that lifting mechanism is the simply connected assembly pulley, as certain on these a little swing cranes.

No. 1393771, Russian Patent, the equalizer pulley of reflection lift heavy signal is installed on the double-arm lever that dead axle rotates, balance by means of stretching and compression spring, make it be in quick condition, when overload, the deflection of spring makes the double-arm lever revolution, the action of triggering master cock, the subject matter of this patent is: the level that the conversion of lift heavy signal is transmitted is many, the part of forming increases, and the precision of load lifting limiter is affected, and equalizer pulley and hoisting crane integral body are isolated, component locations change in addition around causing is difficult for installing and adjusting; When hoisting crane is worked, the equalizer pulley of reflection lift heavy signal is in quick condition, will produce vibration, increase deletrious mechanical vibration factor to hoisting crane, because the possible deflection of raising line, the equalizer pulley that is in quick condition will can reservation not transmit into this interfering signal, and cause the master cock misoperation.

Existing technology shows, still there is not a kind of applicability load lifting limiter of mechanical type widely so far both at home and abroad, especially to make lift heavy do the general-purpose overhead crane transfer crane of horizontal rectilinear motion and handling bridge etc. in the dolly mode, still the technical scheme that lacks feasibility, the lifting mechanism of this class hoisting crane adopts the transmission of duplex assembly pulley more, the fixed pulley group is placed under the trolley frame, make prior art be difficult to obtain suitable installation site, what have attempts to utilize the scheme that is associated with equalizer pulley, this not only still exists above-mentioned installation to adjust problem, and the hoisting crane of some tonnage, limit by the pulley multiplying power, equalizer pulley can only be installed on the running block at gib head position, at present, domestic at the hoisting crane of usefulness or the hoisting crane machine product of existing manufacturer production, major part does not also have supporting load lifting limiter, what this situation far can not adapt to defined among the GB6067-85＜crane safety rules〉should adorn the requirement that maybe should adorn load limiter by hoisting crane kind and tonnage, this problem has become current assurance hoisting crane normal operation, prevent accident, improve one of the key problem in technology in service life.

The purpose of this utility model is to provide a kind of applicability very strong; the load lifting limiter of the mechanical type that can be used widely; it should separate with hoisting crane is whole; under the condition that need not to change any scantling of structure on the hoisting crane; as one independently annex be installed to the position that multiple hoisting crane can adapt to and get on, and given play to its normal overload protection function.

The purpose of this utility model is achieved in that under the crane carriage frame or near the fixed pulley group of elevator boom rack upper end, in walking around the fixed pulley group in the raising line branch of arbitrary pulley, a horizontal positioned is installed, and make its two ends and the symmetrical self contained system of fixed pulley sagittal plane vertical axis, it mainly is made up of three parts:

1, include resistance cylinders, spring, piston, the spring damping cylinder of push rod etc., and be attached to and push away.Thimble on the bar and the master cock that is attached on the resistance cylinders are as the main body triggering part.

2. the right-hand member of spring damping cylinder has pressure transmission pulley that links with push rod and two leading sheaves equidistantly arranging up and down with its, forms the signal conversion part branch.

3. the left end of spring damping cylinder, with a pressure-bearing pulley that links with resistance cylinders and and two leading sheaves up and down of its equidistant placement, form the support balance portion.

From the raising line branch that fixed pulley is drawn, the leading sheave on pile warp right-hand member top, behind the middle pressure transmission pulley and the leading sheave of bottom, make raising line to angle of original vertical deflection, will reflect that then the rope tension of lift heavy signal is converted to the product that this pressure of horizontal pressure that acts on the pressure transmission pulley equals two-fold rope tension and angle of deviation sine.When angle of deviation was little, horizontal pressure will be finished the conversion of lift heavy signal, and transmit to the main body triggering part according to this than the remarkable reduction of rope tension.

With pressure transmission pulley bonded assembly push rod, under the effect of horizontal pressure, make the spring in the resistance cylinders produce distortion by piston, its amount of compression obviously is directly proportional with the lift heavy signal, and by reflecting with push rod bonded assembly thimble stroke.When the lift heavy overrate, thimble will trigger master cock, to cut off the lifting mechanism power supply.

From another root raising line branch that fixed pulley is drawn, the top leading sheave of pile warp left end, when middle pressure-bearing pulley and bottom leading sheave, equally rope tension is converted into horizontal pressure, because these three pulleys all link to each other with resistance cylinders, can balance play the support equilibrium activity from the horizontal pressure of right-hand member.

In addition, whole device is hinged on it under crane carriage frame or the crane arm upper end by means of connecting rod member, is the vertical state, plays automatic positioning effect.

The advantage of technical scheme provided by the utility model is:

1. simple bright the analysing of level transmitted in the conversion of the course of action from the lift heavy signal to master cock, other the number of packages amount of forming is few, reduced the error that assembling causes, because the shock damping action of spring damping cylinder and the support equilibrium activity of pulley system, get rid of interference as much as possible, have the little effect of composition error from the lift heavy inertia impact of all directions.

2. all design of parts are become a compactness, little independent whole of oad be easy to adjust and demarcate, especially as the master cock of an electromechanical that has enlarged, can be as the annex of a complete machine, be installed to the position that polytype hoisting crane can adapt to and get on.Has widely applicable effect.Particularly solved general-purpose overhead crane effectively, transfer crane and dress tool bridge etc. has the overload protection problem of a class hoisting crane of crane carriage.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing.

Fig. 1 is the front elevation of a specific embodiment of the present utility model:

Fig. 2 is according to the A-A cutaway view on Fig. 1.

Fig. 3 is according to the B-B part sectional view on Fig. 2.

Fig. 4 is to partial view according to the C on Fig. 2.

Below in conjunction with installation position and connection mode, concrete structure and the service condition of description of drawings the utility model on hoisting crane.

Fig. 1 and Fig. 2 have expressed that installation position and the connection mode of the utility model on hoisting crane: Fig. 1 and Fig. 2 dashed rectangle are inner divides that to have expressed it be an independently single unit system, be placed in the fixed pulley group vicinity that includes fixed pulley ［ 2 ］ and fixed pulley axis ［ 3 ］ under the crane carriage frame ［ 1 ］, walk around the centre of the raising line left branch ［ 4 ］ and the raising line right branch ［ 5 ］ of fixed pulley ［ 2 ］.The integral body of utility model by means of with resistance cylinders ［ 6 ］ affixed be connected wing plate ［ 7 ］, pass all raising line branches of the right and left after, be connected with link plate ［ 9 ］ on being cemented in fixed pulley axis ［ 3 ］ with boatswain chair ［ 8 ］.Such connection mode can guarantee that section raising line that interrelates with utility model is in vertical as much as possible, plays automatic positioning effect.

Fig. 1 has expressed the concrete structure and the service condition of utility model: behind the pressure transmission pulley ［ 11 ］ and bottom right leading sheave ［ 12 ］ in the middle of the right branch ［ 5 ］ of raising line is walked around upper right pulley ［ 10 ］, make this section raising line to angle of the outside deflection of original vertical, the raising line pulling force of the pressure transmission pulley ［ 11 ］ in the middle of walking around, go up synthetic horizontal pressure at pressure transmission pulley ［ 11 ］, the raising line pulling force of reflection lift heavy signal then is converted into horizontal pressure, passes to the spring damping cylinder that is connected with pressure transmission pulley ［ 11 ］ simultaneously.Spring damping cylinder mainly is made up of resistance cylinders ［ 6 ］ spring ［ 13 ］ piston ［ 14 ］ push rod ［ 15 ］ etc.When push rod ［ 15 ］ is subjected to the horizontal pressure of pressure transmission pulley ［ 11 ］, pass to the piston affixed ［ 14 ］ with push rod, spring ［ 13 ］ is subjected to the compression of piston ［ 14 ］ and is out of shape, and its deflection obviously is directly proportional with the lift heavy signal.And reflect by the stroke of push rod ［ 11 ］, when the lift heavy overrate, will make the triggering part action.

Fig. 4 has expressed the concrete structure and service condition of triggering part: since with datum plate ［ 16 ］ that push rod ［ 15 ］ is connected on thimble ［ 17 ］ the reflection push rod stroke had, and can pass through the thread connection between thimble ［ 16 ］ and datum plate ［ 17 ］, adjust and demarcate, when the lift heavy overrate, can trigger and the affixed master cock ［ 18 ］ of resistance cylinders ［ 6 ］, so, the normally closed contact of master cock disconnects, the control circuit outage, and the lifting mechanism power circuit is cut off, lifting mechanism quits work automatically.Normal opened contact is connected in the master cock simultaneously, and the circuit that red light and loudspeaker are housed is connected, and signal gives the alarm.

Fig. 3 has expressed the concrete structure and the service condition of spring damping cylinder, in order to get rid of the influence of lift heavy inertia impact, prevents the malfunction in advance of master cock.In damping spring cylinder body ［ 6 ］, fill hydraulic oil ［ 19 ］.When lift heavy, piston ［ 14 ］ is compression spring ［ 13 ］ left, and the hydraulic oil ［ 19 ］ that pushes its left side moves.It is discharged from damping hole ［ 20 ］.Get back in the cavity of piston ［ 14 ］ the right resistance cylinders.When unloading, spring ［ 13 ］ resets, and piston ［ 14 ］ moves to right, and the hydraulic oil ［ 19 ］ in the cavity of pushing the right is discharged from damping hole ［ 20 ］; Get back to again in the cavity on piston ［ 14 ］ left side.With the spinning in and out of resistance cylinders ［ 6 ］, can adjust the size of shock damping action with the damping adjustment valve ［ 21 ］ of thread connection.Damping cylinder cap ［ 22 ］ seals.

Fig. 1 has also expressed the concrete structure and the service condition of the utility model support balance portion: when walking around the raising line left branch ［ 4 ］ that fixed pulley comes out, walk around upper left leading sheave ［ 23 ］, behind middle the pressure-bearing pulley ［ 24 ］ and lower-left leading sheave ［ 25 ］, obviously the raising line pulling force that also will walk around pressure-bearing pulley ［ 24 ］ is converted into horizontal pressure, this pressure is passed to the resistance cylinders that is connected with pressure-bearing pulley ［ 24 ］, with balance from the right pressure transmission pulley ［ 11 ］, through push rod ［ 15 ］, piston ［ 14 ］, spring ［ 13 ］ give the duty pressure that waits of resistance cylinders ［ 6 ］.Again by means of triatic stay ［ 27 ］ vertically strut ［ 26 ］ and the connection tube head ［ 28 ］ that connects them make each leading sheave ［ 10 ］, ［ 12 ］, ［ 23 ］, ［ 25 ］ are all with resistance cylinders ［ 6 ］ Joint.This is just with the left side of raising line, right two branches ［ 4 ］, and the external force that ［ 5 ］ are produced when walking around them, balance mutually, and be converted into each part ［ 26 ］ in addition that connects them, ［ 27 ］, ［ 28 ］, the internal force of ［ 6 ］.Support the effect of balance portion also to be with a raising line left side, right two branches ［ 4 ］, ［ 5 ］ link together, be not subjected to the influence of raising line deflection,, adjust each leading sheave ［ 10 ］ by means of the thread connection that connects between tube head ［ 28 ］ and vertical strut ［ 26 ］ and the triatic stay ［ 27 ］, ［ 12 ］, ［ 23 ］, ［ 25 ］ are in the spacing of level and vertical direction, so that the adjustment of utility model and demarcation.

Claims (3)

1, a kind of load lifting limiter that is used for hoisting crane, comprise pulley system, spring [13], the thimble [17] relevant with spring [13] deflection, master cock [18] is characterized in that it is an independently single unit system, with by two branches [4] about the raising line of fixed pulley [2], [5] interrelate, its base portion is a spring damping cylinder, directly link to each other with the pulley system that belongs to device proper, wherein pressure-bearing pulley [24] and pressure transmission pulley [11] are positioned at the left side of spring damping cylinder, right two ends, be connected with push rod [15] with resistance cylinders [6] respectively, upper left leading sheave [23], lower-left leading sheave [25] and upper right leading sheave [10], bottom right leading sheave [12] is respectively along a raising line left side, right two branches [4], [5] direction, horizontal center line with spring damping cylinder is an axis symmetric arrangement up and down, and links together with resistance cylinders [6].

2, load lifting limiter according to claim 1, it is characterized in that with left and right two branches of raising line ［ 4 ］ by fixed pulley ［ 2 ］, ［ 5 ］ respectively around to upper left leading sheave ［ 23 ］, pressure-bearing pulley ［ 24 ］, lower-left leading sheave ［ 25 ］ and upper right leading sheave ［ 10 ］, pressure transmission pulley ［ 11 ］, bottom right leading sheave ［ 12 ］, simultaneously by means of resistance cylinders ［ 6 ］ and the connection that is connected wing plate ［ 7 ］, boatswain chair ［ 8 ］, link plate ［ 9 ］, be placed in it under crane carriage frame or elevator boom rack on.

3, load lifting limiter according to claim 1 is characterized in that spring damping cylinder has resistance cylinders ［ 6 ］ with damping hole ［ 20 ］, spring ［ 13 ］, piston ［ 14 ］ push rod ［ 15 ］, damping port lid ［ 22 ］, damping and adjusts in the cavity of valve ［ 21 ］ spring damping cylinder and fill hydraulic oil ［ 19 ］.

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