CN200995933Y - Self-erection and up-rotating tower-type elevator - Google Patents

Abstract

An upper rotating auto-erecting tower crane comprises a tower body, a tower top, a lifting arm, a balance arm, a lifting device and a pulley block (3) arranged on the tower top, which is characterized in that: an erecting pull rod (5) is articulated on the upper part of the tower top and an erecting strut (6) is articulated on the middle part of the tower top. The upper end of the erecting pull rod (5) and the upper end of the erecting strut (6) are articulated each other. An erecting pulley block (7) is fixed at the articulated end of the erecting pull rod and the erecting strut.

Description

Tower crane is set up in last rotation voluntarily

Technical field

The utility model relates to a kind of tower crane, and tower crane is set up in particularly a kind of upward rotation voluntarily.

Background technology

Tower crane is a requisite important preparation of construction in the modern construction, is widely used in the construction of hotel, dwelling house, industrial building, large span factory building and high turriform building, also can be used for the cargo handing and the carrying in harbour, goods yard.Tower crane (hereinafter to be referred as the tower machine) plays key role to guaranteeing construction quality, assurance construction safety, raising operating efficiency, also is the important symbol of mechanized construction level.

In recent years, all there is significant progress in China at the aspects such as performance of the design calculation means of tower machine, production and processing technology, auxiliary work mechanism, but tower machine accident happens occasionally, report according to China Reconstructs: China's tower machine accident is startling, 11 of tower machine accidents took place in 2000 altogether, wherein there are 7 in the installation or removal process, to take place, cause 17 people's death, 4 people injured, cause cataphoretic failure for the country and people's lives and properties.This shows that it is the weak link that the tower machine is installed and used that erection process is installed.

The residential housing of China small and medium-sized cities and samll cities and towns is generally tier building, the height of every building generally is no more than 30m, length is no more than 60m, on mainly being, rotate the tower machine that sets up of installing voluntarily at present in the construction with the tower machine, specification is mainly below the 250kN.m, as adopt the jack up tower machine of same specification, the complete machine cost will increase by 20,000 yuan, and the following tower machine of 250kN.m also can only be used for the dwelling construction construction, the employing jack up has little significance, and the above rotation of institute is installed voluntarily and set up the tower machine is present domestic product, a most salable class tower machine.Such tower machine all improves a lot at aspects such as structure and mechanism, safety device, serviceabilitys, and on the self-propelled mount(ing) equipment, method, does not have special-purpose erecting device, and accident happens occasionally.Can therefore, research and design go out safe, reliable, practical erecting device and method, be that to be related to revolution self-chambering tower function deny the fine key that satisfies the dwelling construction construction requirement.

At present domestic upward rotation is installed the erecting frame equipment, method that sets up the tower machine voluntarily and is generally:

1. the whole tower machine vertical axis from the body of the tower standard knot to cat head partly adopts pole to install, and comparative maturity is reliable.

2. the method for hanging assembly pulley on cat head is adopted in the installation of tower machine crane arm and equilibrium arm, utilize the self hoisting mechanism jib of slinging earlier that the arm root is connected with body of the tower arm root hinge, again wear then around assembly pulley jib around the pull-up of arm root hinge to level, connect the jib pull bar again.Because the designer lacks consideration to the installation steps of last revolution self-chambering tower machine, hypsokinesis is leaned forward, is had in the design of cat head, can not take into account the installation of crane arm and equilibrium arm simultaneously, and cat head does not design erecting device, just make that installation is very inconvenient, have a lot of accident potential, existing is the example explanation with neutral cat head:

The first step, shown in Fig. 1 a, Fig. 1 b, because cat head does not design erecting device, the assembly pulley of cat head is positioned on the body of the tower vertical axis, and body of the tower arm root hinge is overhanging, when slinging jib connecting arm root hinge, for preventing to collide body of the tower, jib must be oblique movement, needs the ground staff to pull out certain angle at the jib afterbody by auxiliary stay cord 4 and cooperates.Because this moment, the jib two ends were the flexible rope connection, there are a lot of safety hazard in upset easily, and the self hoisting mechanism pulling force increases simultaneously; Arm support position is uncertain to dress arm root hinge the time, repeatedly centering, quite difficulty.

Second step, around arm root hinge pull-up jib, need wear around assembly pulley at cat head and jib front portion, shown in Fig. 2 a, Fig. 2 b, installation personnel is wanted aloft work, and time-consuming, effort is very dangerous; The mode of motion of jib is that dead axle rotates, and computation model is shown in Fig. 5 a, and jib deadweight (comprising luffing mechanism, amplitude variation trolley) is G, and center of gravity is L to the distance of arm root hinge _OH, erection pulling force S (along the CA direction) will overcome the jib deadweight, tower horn root hinge is got square: shown in Fig. 5 a

∑ M _O〉=0, then

S×L _OC×sin∠OCA≥G×L _OH×sin∠HOF

Because cat head is not installed erecting device, assembly pulley and jib angle ∠ OCA are very little, need a fairly large number of ground staff to cooperate outside pull-up jib, and be subjected to on-the-spot place to limit, be difficult to sometimes guarantee initial angle ∠ HOF, this moment, erection pulling force S was bigger, the slippage of raising line attachment point appears in poor stability easily, and human casualty accident took place for this reason.Especially after crane arm is evened up, also want on the personnel to shoulder on the crane arm and lift, dock the crane arm pull bar, very dangerous, human casualty accident also took place for this reason.

Summary of the invention

The utility model is in order to overcome the deficiency of above technology, provide a kind of have safety, reliable, set up and go up rotation easily and set up tower crane voluntarily.

The utility model is realized by following measure:

Tower crane is set up in upward rotation of the present utility model voluntarily, include body of the tower, cat head, crane arm and equilibrium arm, lifting mechanism, be fixed with a cat head assembly pulley on the cat head, the upper articulation of cat head has one to set up pull bar, the middle part of cat head is hinged with one and sets up strut, set up pull bar and be hinged with the upper end of setting up strut, the hinged place of upper end is fixed with one and sets up assembly pulley.

Above-mentionedly of the present utility modelly go up rotation and set up tower crane voluntarily, in order to fixedly mount jib more easily, describedly set up assembly pulley and body of the tower jib point of connection is positioned on the perpendicular line.

Tower crane is set up in above-mentioned upward rotation of the present utility model voluntarily, removes and sets up pull bar, can make to set up the hinge-point rotation of strut around the cat head middle part, rises and pulls jib.

Tower crane of the present utility model set up installation method, adopt following steps:

(1) install body of the tower and cat head after, on cat head, install and set up pull bar, set up strut and set up assembly pulley;

(2) fix the interim assembly pulley of a jib in the end of jib, the lifting mechanism steel rope is by the interim assembly pulley of jib, cat head assembly pulley and set up assembly pulley, forms many multiplying powers lifting pulley group, and jib is vertically sling is fixed on the arm root hinge of body of the tower upper end;

(3) remove and to set up pull bar, make and set up strut and can rotate around the hinge-point at cat head middle part;

(4) the jib pull bar is connected the jib middle front part and draws a little and set up between the strut upper end,, the lifting mechanism steel rope is by the cat head assembly pulley and set up assembly pulley, forms many multiplying powers lifting pulley group;

(5) start lifting mechanism and tighten up hoist rope, make cat head assembly pulley and set up the assembly pulley relative motion, jib is pulled into horizontal, jib pull bar upper end is also near the cat head point of connection simultaneously, connects also fixingly, finishes jib and installs.

Tower crane is set up in upward rotation of the present utility model voluntarily, installs voluntarily at present upward rotation and sets up the problem that middle existence is set up in the installation of tower machine, and at cat head design and installation erecting device, the jib docking arm root hinge of can vertically slinging is eliminated uncertain factor; Design strut and jib simultaneously and form kink four bar linkage, make jib have bigger rising to pull angle in the process all the time rising to pull, reduce the stressed and winch steel rope multiplying power of each framing member, have safety, reliable, set up advantage easily.

Description of drawings:

Fig. 1 a, Fig. 1 b structural representation when not adopting the crane loading jib of double rocking lever erecting device

Structural representation when Fig. 2 a, Fig. 2 b set up jib for the hoisting crane that does not adopt the double rocking lever erecting device

Structural representation when Fig. 3 a, Fig. 3 b are tower crane of the present utility model lifting jib

Fig. 4 a, Fig. 4 b are the structural representation of tower crane of the present utility model when setting up jib

Fig. 5 a is the utility model and the hoisting crane computational analysis comparison diagram that does not adopt the double rocking lever erecting device

Fig. 5 b is hoisting crane double rocking lever kink four bar linkage computational analysis figure of the present utility model

Fig. 6 is the I partial enlarged drawing of Fig. 3 b

Fig. 7 is the II partial enlarged drawing of Fig. 4 b

Among the figure: the auxiliary stay cord of 1-lifting mechanism, the interim assembly pulley of 2-jib, 3--cat head assembly pulley, 4--, 5--set up that pull bar, 6-set up strut, 7-sets up assembly pulley, 8--jib pull bar.

The specific embodiment:

Below in conjunction with the specific embodiment the utility model is further detailed.

Tower crane is set up in upward rotation of the present utility model voluntarily, include body of the tower, cat head, crane arm and equilibrium arm, be fixed with a cat head assembly pulley 3 on the cat head, the upper articulation of cat head has one to set up pull bar 5, the middle part of cat head is hinged with one and sets up strut 6, set up pull bar 5 and be hinged with the upper end of setting up strut 6, the hinged place of upper end is fixed with one and sets up assembly pulley 7.

Concrete erecting frame equipment, method is as follows:

The first step, as Fig. 3 a, Fig. 3 b, shown in Figure 6, install body of the tower and cat head after, on cat head, install and set up pull bar 5, set up strut 6 and set up assembly pulley 7; Fix the interim assembly pulley 2 of a jib in the end of jib, the lifting mechanism steel rope is by the interim assembly pulley 2 of jib, cat head assembly pulley 3 and set up assembly pulley 7, forms many multiplying powers lifting pulley group, and jib is vertically sling is fixed on the arm root hinge of body of the tower upper end.Owing to set up strut 6 and stretch out beyond the body of the tower, make and set up assembly pulley 7 and just in time be positioned on the body of the tower jib point of connection axis, arm support position is determined during to dress arm root hinge, vertically mentions jib, just can be easily to adorning.

Second step, as Fig. 4 a, Fig. 4 b, shown in Figure 7, pull bar 5 is set up in dismounting, make and set up strut 6 and can rotate around the hinge-point at cat head middle part, jib pull bar 8 is connected the jib middle front part to be drawn a little and sets up between the strut upper end, at cat head assembly pulley 3 with set up between the assembly pulley 7 and wear, form many multiplying powers lifting pulley group around steel rope; Start lifting mechanism and tighten up hoist rope, make cat head assembly pulley and set up the assembly pulley relative motion, jib is pulled into horizontal, jib pull bar upper end is also near the cat head point of connection simultaneously, connects also fixingly, finishes jib and installs.

Principle of work of the present utility model is: stretch out beyond the body of the tower owing to set up strut, BDCO four rod members are formed kink four bar linkage.As shown in Figure 5, the OB bar is that frame, length are L4, and the BD pole length is L1, with frame angle Φ 1, the DC pole length is L2, with frame angle Φ 2, the CO pole length is L3, with frame angle Φ 3, according to theory of machines: the shortest member and the longest member sum are greater than other two members sums in the kink four bar linkage, all revolute pairs of this kinematic link all can not be done complete cycle and rotate, and getting any member is that the mechanism that frame is formed is double rocker mechanism, can prevent to set up the strut super vertex like this and rotate.The calculated relationship of Φ 1, Φ 2, Φ 3 is as follows:

A＝l ₄-l ₁×cosΦ ₁

B＝-l ₁×sinΦ1

$C=\frac{A^2+{\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="Y20072001730400081.png,Y20072001730400091.png"\; state="\{\{state\}\}">B</figure-callout>}}^2+{{\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="Y20072001730400081.png,Y20072001730400091.png"\; state="\{\{state\}\}">l</figure-callout>}}_3}^2-{{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="Y20072001730400081.png,Y20072001730400091.png"\; state="\{\{state\}\}">l</figure-callout>}}_2}^2}{2\&times;{\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="Y20072001730400081.png,Y20072001730400091.png"\; state="\{\{state\}\}">l</figure-callout>}}_3}$

${\mathrm{\&Phi;}}_3=2\mathrm{arctg}\frac{B\&PlusMinus;\sqrt{{{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="Y20072001730400081.png,Y20072001730400091.png"\; state="\{\{state\}\}">A</figure-callout>}}_2+B}^2-C^2}}{A-C}$

${\mathrm{\&Phi;}}_2=\mathrm{arcrg}\frac{B+{\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="Y20072001730400081.png,Y20072001730400091.png"\; state="\{\{state\}\}">l</figure-callout>}}_3\sin {\mathrm{\&Phi;}}_3}{A+{\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="Y20072001730400081.png,Y20072001730400091.png"\; state="\{\{state\}\}">l</figure-callout>}}_3\cos {\mathrm{\&Phi;}}_3}$

As shown in Figure 5, setting up strut (the BD pole length is L1) rotates around the B point, assembly pulley is ∠ BDA with setting up the strut angle, assembly pulley and jib angle ∠ OCA when not having installing mechanism greater than cat head, at crane arm and perpendicular line angle is 3 when spending, assembly pulley with set up strut angle ∠ BDA can reach 23 the degree, erection pulling force S1 (along the DA direction) when not having installing mechanism erection pulling force S (along the CA direction) 1/4th, the cooperation that does not need the ground staff is pull-up jib comparatively easily also, in the pull-up jib, the jib pull bar also puts in place simultaneously, and installation personnel stands on the cat head bench board can connect the jib pull bar, has eliminated accident potential.In addition, after erection pulling force S1 (along the DA direction) diminished, pulley block ratio reduced, and at cat head with set up to wear between the strut around steel rope and reduced distance between assembly pulley, can save the length of steel wire rope that increases because of setting up effectively, the length when making it to approach the work of tower machine.

Therefore, the double rocking lever erecting device is installed the safety of setting up the tower machine voluntarily and is absolutely necessary guaranteeing rotation.

Newly-designed upward rotation is installed voluntarily to set up and is adopted this erection method in the tower machine design plan;

The rotation of going up before dispatching from the factory is installed voluntarily and is set up the tower machine and adopt this erection method design and installation erecting device;

Adopt this erection method design and installation erecting device when the tower machine is set up in installation in transition voluntarily in rotation on the usefulness.

Claims (2)

1. tower crane is set up in a last rotation voluntarily, include body of the tower, cat head, crane arm and equilibrium arm, lifting mechanism, be fixed with a cat head assembly pulley (3) on the cat head, its special feature is: the upper articulation of cat head has one to set up pull bar (5), the middle part of cat head is hinged with one and sets up strut (6), the upper end of setting up pull bar (5) and setting up strut (6) is hinged, and the hinged place of upper end is fixed with one and sets up assembly pulley (7).

2. according to claim 1ly go up rotation and set up tower crane voluntarily, it is characterized in that: describedly set up assembly pulley and body of the tower jib point of connection is positioned on the perpendicular line.

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