CN2839225Y

CN2839225Y - Lifting, the A-frame of two groups of fixed pulleys of fluctuating in a housing

Info

Publication number: CN2839225Y
Application number: CN 200520050712
Authority: CN
Inventors: 陈熙祖
Original assignee: 陈熙祖
Current assignee: Hunan Provincial Thermal Power Construction Company
Priority date: 2005-05-11
Filing date: 2005-05-11
Publication date: 2006-11-22
Anticipated expiration: 2015-05-11

Abstract

Lifting, the A-frame of two groups of fixed pulleys of fluctuating in a housing, lifting, two fixed pulleys that rise and fall that A-frame is hung are assembled in the stiff case, and stiff case is hung pulley pin shaft with one be installed in the otic placode on the connecting box ellbeam of taking off club head, lifting, the two fixed pulley groups that rise and fall are triangular arrangement with three axle center that hang pulley pin shaft, and the line at lifting, rise and fall two fixed pulley group switching centres and extension assembly pulley bearing pin center, one angle α is arranged, and α is 45 °-70 °.Promptly,, get the average angle of two operating modes to gin pole amplitude minimum radius (the minimum angle between lifting and the fluctuating fixed pulley group) from the amplitude peak (maximum angle between lifting fixed pulley group and the fluctuating fixed pulley) of gin pole.Like this when the gin pole real work, the actual angle between lifting fixed pulley group and the fluctuating fixed pulley group and above-mentioned design-calculated angle not simultaneously, the deviation minimum of its angle, so two fixed pulley groups are to drawing, press also minimum between pulley housings (dividing plate).

Description

Lifting, the A-frame of two groups of fixed pulleys of fluctuating in a housing

Technical field

The utility model belongs to a kind of weight-lifting equipment, belongs to A-frame class heavy-duty hoisting equipment, is meant especially to be used for the A-frame of big (generally above 300 tons) of weight loading.

Technical background

A-frame is a kind of weight-lifting equipment that lifts by crane usefulness, is used for harbour lifting article more.A-frame generally adds that by a lambdoid gin pole one group of several part such as lifting, fluctuating fixed pulley, winch, steel rope and suspension hook is constituted, and wherein the head at the capable gin pole of herringbone is equipped with lifting, fluctuating fixed pulley.Lifting suspension hook steel rope is installed on the lifting fixed pulley, is to be used to lift by crane article and labour-saving parts; Then be equipped with on the fluctuating fixed pulley and be used for the steel rope that gin pole rises and falls, be used to allow gin pole fluctuating usefulness.The assembly pulley of general design-calculated gin-pole truck is lifting, fluctuating two assembly pulleys, the fixed pulley of lifting, two assembly pulleys that rise and fall is fixed in the head of gin pole respectively with steel rope, because assembly pulley is stressed greatly, even the steel rope safety factor of its dead sheave group is got the safety factor of minimum hawser: 3.5, therefore the steel rope of its φ 64 also needs 12 statures, fixes the bad colligation of steel rope, fixing of this two fixed wheel.Often reflection in the actual use of gin pole, with the sliding surely group of fixation with steel wire, work is trouble very.Simultaneously because the fixed pulley of lifting, two assembly pulleys that rise and fall is fixed in the head of gin pole respectively with steel rope, be easy to generate between each steel rope unbalance stress etc. and bring the assembly pulley bearing to be subjected to bigger moment of flexure, therefore must strengthen by the Dou pin diameter.Moreover, because lifting, the fixed pulley of two assembly pulleys of rising and falling is directly to be fixed in steel rope to take off club head, like this when two fixed pulley single heads draw, just must hang in addition and turn to the single-sheaved block group to winch, because when fixed pulley hangs over the gin pole head with steel rope, when assembly pulley is the single head traction, (this tiltedly draws and is inevitable because of tiltedly drawing to the steel rope of winch, because the lifting winch can not be arranged under the suspension hook, even under the suspension hook of arranging, because suspension hook is when the gin pole changes in amplitude, also can take place tiltedly to draw), top fixed pulley group can be skewed, make haulage cable and pulley not in one plane, and produce drawback such as pulley wearing and tearing, for head it off must near winch hauling rope in addition extension turn to the single-sheaved block group.The mounting means utmost point of therefore existing gin pole lifting, two assembly pulleys that rise and fall remains to be improved.

Summary of the invention

The purpose of this utility model is to provide a kind of structure more reasonable at the deficiency of the mounting means of existing A-frame lifting, two assembly pulleys that rise and fall, and stressed better, the A-frame of more convenient operation hangs.

According to the technology implementation scheme that the purpose of this utility model proposed be: lifting, two fixed pulleys that rise and fall that A-frame is hung are assembled in the stiff case, and stiff case is hung pulley pin shaft with one be installed in the otic placode on the connecting box ellbeam of taking off club head, lifting, the two fixed pulley groups that rise and fall are triangular arrangement with three axle center that hang pulley pin shaft, and the line at lifting, rise and fall two fixed pulley group switching centres and extension assembly pulley bearing pin center, one angle α is arranged, and α is 45 °-70 °.When design, average angle between two fixed pulley groups when angle α is preferably gin pole work: from the amplitude peak (maximum angle between lifting fixed pulley group and the fluctuating fixed pulley) of gin pole, to gin pole amplitude minimum radius (the minimum angle between lifting and the fluctuating fixed pulley group), get the average angle of two operating modes.Like this when the gin pole real work, the actual angle between lifting fixed pulley group and the fluctuating fixed pulley group and above-mentioned design-calculated angle not simultaneously, its angle the deviation minimum, so two fixed pulley groups are to drawing, press also minimum between pulley housings (dividing plate).

Adopt the utility model structure can simplify fixed pulley and the work that is connected of taking off club head widely, and two fixed pulley groups are once assemble with gin pole head tie-beam, promptly no longer take apart, install and remove, transport together with two tie-beams of taking off club head, be very suitable for the needs that this gin pole needs often removal, shifts like this.So not only simplified gin pole dress, tear work capacity open, and assembly pulley work is more reliable, its weight has also alleviated widely.

Simultaneously because the bearing pin otic placode of dead sheave group is to be directly fixed on the gin pole head connecting box ellbeam, in the time of can not producing with steel rope dead sheave bearing pin,, must strengthen by the Dou pin diameter because unbalance stress etc. brings bearing pin to bear bigger moment of flexure between each steel rope.And this designs the moment of flexure that its bearing pin only need be considered bearing pin between otic placode, therefore can reduce pin diameter.

Moreover, because assembly pulley is directly to be fixed in bearing pin to take off club head, like this when two fixed pulley single heads draw, just needn't hang in addition and turn to the single-sheaved block group to winch, because when fixed pulley hangs over the gin pole head with steel rope, when assembly pulley is the single head traction, (this tiltedly draws and is inevitable because of tiltedly drawing to the steel rope of winch, because the lifting winch can not be arranged under the suspension hook, even under the suspension hook of arranging, because suspension hook is when the gin pole changes in amplitude, also can take place tiltedly to draw), top fixed pulley group can be skewed, make haulage cable and pulley not in one plane, and produce drawback such as pulley wearing and tearing, for head it off must near winch hauling rope in addition extension turn to the single-sheaved block group.Because the utility model two assembly pulleys are connected with gin pole head box ellbeam by a shared bearing pin, therefore two assembly pulleys only produces central compression to gin pole with joint efforts, this is with fix the force way of two assembly pulleys on the large circular steel of taking off club head with steel rope identical, but just as previously mentioned, it is fixed, connection work is bad does, and after improving, simplify this work widely, structural weight has alleviated widely.And fix two assembly pulleys with other modes, as two assembly pulleys being rigidly secured to the head before and after the gin pole, then two assembly pulleys with joint efforts can not be with concentric, and produce eccentric compression, and increase the bending stress of gin pole, also just increase the weight of gin pole.

Accompanying drawing and description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is lifting, the fluctuating two fixed pulley group structural representations of a kind of embodiment of the utility model;

Fig. 3 is lifting, the fluctuating two fixed pulley group scheme of installations of a kind of embodiment of the utility model.

Among the figure: 1, chevron pointing gin pole; 2, lifting fixed pulley group; 3, fluctuating two fixed pulley groups; 4, winch; 5, steel rope; 6, suspension hook; 7, stiff case; 8, hang pulley pin shaft; 9, connecting box ellbeam; 10, otic placode; 11, many otic placodes; 12, fastener.

The specific embodiment

The utility model will be further described below in conjunction with accompanying drawing.From accompanying drawing as can be seen, the utility model is that a kind of A-frame that lifts by crane usefulness hangs, comprise chevron pointing gin pole 1, lifting fixed pulley group 2, two fixed pulley groups 3 rise and fall, winch 4, steel rope 5 and suspension hook 6, its characteristics are that lifting fixed pulley group 2 that A-frame is hung and 3 aggregate erections of fluctuating fixed pulley group are in a stiff case 7, stiff case 7 can be to be combined with fastener 12 by many otic placodes 11, and one of stiff case 7 usefulness are hung pulley pin shaft 8 be installed in the otic placode 10 on the connecting box ellbeam 9 of taking off club head, lifting fixed pulley group 2 and fluctuating fixed pulley group 3 are triangular arrangement with three axle center that hang pulley pin shaft 8, and there is an angle α at lifting fixed pulley group 2 and fluctuating fixed pulley group 3 centers with the line of hanging assembly pulley bearing pin 8 centers, and α is 45 °-70 °.Average angle between two fixed pulley groups when angle α is preferably gin pole work: from the amplitude peak (maximum angle between lifting fixed pulley group and the fluctuating fixed pulley) of gin pole, to gin pole amplitude minimum radius (the minimum angle between lifting and the fluctuating fixed pulley group), get the average angle of two operating modes.Like this when the gin pole real work, the actual angle between lifting assembly pulley and the fluctuating assembly pulley and above-mentioned design-calculated angle not simultaneously, its angle the deviation minimum, so two fixed pulley groups are to drawing, press also minimum between pulley housings (dividing plate).

Claims

1, lifting, the A-frame of two groups of fixed pulleys in a housing rises and falls, comprise chevron pointing gin pole (1), lifting fixed pulley group (2), two fixed pulley groups (3) rise and fall, winch (4), steel rope (5) and suspension hook (6), it is characterized in that lifting fixed pulley group (2) that A-frame is hung and fluctuating fixed pulley group (3) aggregate erection are in a stiff case (7), and stiff case (7) is hung pulley pin shaft (8) with one be installed in the otic placode (10) on the connecting box ellbeam (9) of taking off club head, lifting fixed pulley group (2) and fluctuating fixed pulley group (3) are triangular arrangement with three axle center that hang pulley pin shaft (8), and there is an angle (α) at lifting fixed pulley group (2) and fluctuating fixed pulley group (3) center with the line of hanging assembly pulley bearing pin (8) center, and angle (α) is 45 °-70 °.

2, lifting as claimed in claim 1, the A-frame of two groups of fixed pulleys in a housing that rise and fall is characterized in that described stiff case (7) is to be combined by many otic placodes (11) and fastener (12).