CN105480846A - Universal lifting tool provided with length-adjustable lifting belts and used for shelter - Google Patents

Abstract

The invention discloses a universal lifting tool provided with length-adjustable lifting belts and used for a shelter. The universal lifting tool comprises a main lifting ring, at least four branch lifting belts and length adjusters. One end of each branch lifting belt is connected with the main lifting ring. Each length adjuster comprises fixing plates on the two sides and three parallel cylindrical supporting rods vertically connected with the fixing plates on the two sides. The other ends of the branch lifting belts penetrate D-shaped rings and then penetrate the three corresponding cylindrical supporting rods in a crossed manner to be connected with the corresponding cylindrical supporting rods in the middle. Each length adjuster further comprises a belt pressing plate and pressing rotary knobs. The pressing rotary knobs are arranged at the two ends of each belt pressing plate and connected with the fixing plates through threads. The belt pressing plates can be pressed on the corresponding cylindrical supporting rods in the middle by rotating the pressing rotary knobs. By the adoption of the universal lifting tool, the length of each lifting belt can be adjusted in a stepless manner, so that the lifting tool is universal and capable of lifting shelters of different specifications.

Description

The length-adjustable shelter Universal hanger of a kind of suspender belt

Technical field

The present invention relates to a kind of square cabin hanger.More specifically, the length-adjustable shelter Universal hanger of a kind of suspender belt is related to.

Background technology

Shelter lifting is the common task in production scene, also relates to the work that security requirement is higher, selects scientific and reasonable suspender belt instrument to become the important administration behaviour of of minimizing security risk.There is following defect in used shelter lifting device:

1. the Back ground Information such as existing shelter weight, length is all different, does not still have the shelter that a kind of general suspender belt Liftable is all.It is 3m, 4m and 5m shelter not etc. that production scene has length usually, and at 3t, 4t and 5t not etc., often kind of suspended object all needs to be equipped with a kind of special suspender belt to weight distribution, virtually adds the cost of purchase cost and maintenance, maintenance.

2. the general Dou Bu center of existing shelter barycenter, traditional shelter suspender belt is made up of the suspender belt of two regular lengths usually, and suspender belt is connected with crane by suspension ring.Two suspender belts easy play on suspension ring, leveling work is difficult to carry out.

3., because existing suspender belt is all made up of two suspender belts, two suspender belt easily overlapping extruding mutually on suspension ring, cause suspender belt tensioning below, one relaxes, causes potential safety hazard.

4. existing suspender belt length is all fixing and unadjustable, when factory building height is lower, when lifting operation is height-limited, in order to ensure to hang height, making suspender belt lift angle excessive, adding the security risk of operation.

Summary of the invention

For the defect existed in above-mentioned prior art, the technical problem to be solved in the present invention is to provide a kind of operation height and is subject to safety in limited time high and length-adjustable shelter Universal hanger.

For solving the problems of the technologies described above, the present invention adopts following technical proposals:

The length-adjustable shelter Universal hanger of a kind of suspender belt, comprise: main suspension ring, article at least 4, branch's suspender belt and length adjuster, described in every bar, one end of branch's suspender belt is all connected with main suspension ring, described length adjuster comprises that the adapter plate of both sides and 3 be arranged in parallel and cylindrical support bar connected vertically with the adapter plate of both sides, the other end of described branch suspender belt is connected with the cylindrical support bar of centre after crossing through 3 cylindrical support bars again after D type ring, described length adjuster also comprises pressure zone plate and compresses knob, described compression knob is arranged on the two ends of pressure zone plate and is connected with described adapter plate by screw thread, described pressure zone plate can be pressed on middle cylindrical support bar by rotating described compression knob.

Preferably, described branch suspender belt is flat hoisting belts.

Preferably, the diameter of the cylindrical support bar on described length adjuster is 15 ~ 30mm, and the distance between adjacent supports bar is scope is 35 ~ 45mm.

Beneficial effect of the present invention is as follows:

This shelter Universal hanger adopts main suspension ring to add the version of four branch's suspender belts, each branch suspender belt is separate, play when avoiding the lifting of traditional suspender belt extrudes with overlapping the problem brought, the security risk of the lifting operation reduced, Hoisting Security problem when especially lifting operation is height-limited; According to many around pressure self-locked principle design length adjuster, realize the step-less adjustment of suspender belt length, this suspender is made to have commonality, the shelter of different size specification series can be lifted, and the skew (length direction ± 1m of shelter barycenter can be adapted within the specific limits, Width ± 0.5m), change the situation that tradition often kind of suspended object all needs to be equipped with a kind of special suspender belt, reduce buying and the maintenance cost of suspender.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Fig. 1 illustrates structural representation of the present invention.

Fig. 2 illustrates the front view of length adjuster of the present invention.

Fig. 3 illustrates the lateral plan of length adjuster of the present invention.

Fig. 4 illustrates partial side view of the present invention.

Fig. 5 illustrates the Force principle figure of length adjuster of the present invention.

Detailed description of the invention

In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.

As shown in figures 1-4, a kind of suspender belt length-adjustable shelter Universal hanger comprises main suspension ring 1,4 branch's suspender belts 2.Main suspension ring 1 are circle suspension ring, and 4 branch's suspender belts 2 are the equal flat sling of length.Mei Gen branch suspender belt 2 is equipped with length adjuster 3, length adjuster 3 comprise the adapter plate 7 that is positioned at both sides and be arranged in parallel and 3 the cylindrical support bars 8 welded with adapter plate 7.One end of branch's suspender belt 2 is connected with main suspension ring 1, and the other end is connected with the cylindrical support bar 8 of centre through rear after crossing through 3 cylindrical support bars 8 from D type ring 4 again.Length adjuster 3 also comprises compression knob 5 and pressure zone plate 6, compresses knob 5 and is arranged on the two ends of pressure zone plate 6 and is threaded connection with adapter plate 7, pressure zone plate 6 and the cylindrical support bar 8 being positioned at centre can be compressed by rotatably compressing knob 5.

As shown in Figure 5, length adjuster 3 designs according to " how around pressure self-locked principle ", when branch's suspender belt 2 is stressed, branch's suspender belt 2 above length adjuster 3 is individual layer, stressed is F, below branch suspender belt 2 is double-deck, and every layer stressed is F/2, and both differ F/2 makes branch's suspender belt 2 produce the trend of sliding upward.But because branch's suspender belt 2 and strut bar 8 form contact, produce friction force thus, the summation of many places friction force is greater than F/2, because which limit the slip of branch's suspender belt 2, makes it to be in stabilized conditions when stressed.The maximum static friction force that length adjuster can provide is relevant to its structure.If the diameter of section of strut bar 8 is d, the distance of adjacent two strut bars 8 is L, and the strut bar 8 at upper and lower two ends is μ with the friction coefficient at branch's suspender belt 2 place ₁, middle strut bar 8 place is the Contact of branch's suspender belt 2, and its friction coefficient is μ ₂, the sling-tension between upper end strut bar 8 and middle studdle 8 is T ₁, the sling-tension between middle studdle 8 and lower end strut bar 8 is T ₂, branch's suspender belt 2 is α at the cornerite at strut bar 8 place at upper and lower two ends ₁, the cornerite at middle studdle 2 place is α ₂.If three strut bars 8 point-blank, and spacing is equal between two, then α ₂=2 α ₁.

When being about to skid, then following formula should be had to set up:

$\frac{F_1}{T_1}=e^{{\mathrm{\μ}}_1\mathrm{\α}}---\left(1\right)$

$\frac{T_1}{T_2}=e^{2{\mathrm{\μ}}_2\mathrm{\α}}---\left(2\right)$

$\frac{T_2}{F_2}=e^{{\mathrm{\μ}}_1\mathrm{\α}}---\left(3\right)$

Formula (1) formula (2) is multiplied respectively with formula (3) left and right:

$\frac{F_1}{F_2}=e^{2\mathrm{\α}({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}---\left(4\right)$

As can be seen from formula (4), ensure that suspender belt is non-slip, then should have:

$\frac{F_1}{F_2}\≤e^{2\mathrm{\α}({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}---\left(5\right)$

Again because:

F ₁＝2F ₂(6)

So:

$e^{2\mathrm{\α}({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}\≥2---\left(7\right)$

Wherein, $\mathrm{\α}=\arcsin \left(\frac{d}{L}\right).$

To sum up, can find out by controlling strut bar diameter d and adjacent supports span L and contact surface coefficientoffrictionμ ₁and μ ₂formula (7) is set up, can ensure that in hoisting process, suspender belt is non-slip.

If K is margin of safety, have:

$K=\frac{e^{2\mathrm{\α}({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}}{2}---\left(8\right)$

Time, suspender belt there will not be skidding.

Can be found out by formula (8) and increase strut bar diameter, shorten strut bar spacing and increase the margin of safety that contact surface friction coefficient all can improve length adjuster.

In this implementation column, the construction parameter of shelter Universal hanger is selected:

Length adjuster 3 is critical components of this suspender.Length adjuster 3 can be safe and reliable work, be the key that can the program feasible.

For guaranteeing the feasibility of this scheme, made test exemplar and carried out the checking of antiskid capability, strut bar 8 selects the round steel of surperficial decorative chromium.Get L=50mm, d=25mm, look into friction coefficient table, μ ₁the coefficientoffrictionμ of reference nylon and steel ₁=0.37, μ ₂the coefficientoffrictionμ of reference nylon and nylon ₂=0.3 ~ 0.5 (removing the limit 0.3), brings formula (8) into:

$K=\frac{e^{2\mathrm{\α}({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}}{2}=\frac{e^{2\×0.524\×(0.37+0.3)}}{2}=1.01$

Test exemplar is carried out pull test on puller system, when suspender belt is stressed, does not produce slip.

Through type (8) can find out affect K value because have coefficientoffrictionμ ₁, μ ₂with for putting forward high-k, can have with under type:

1) μ is kept ₁, μ ₂constant, increase the ratio of d and L:

(1) consider that the thickness of ordinary flat suspender belt is generally at 7mm, find out that the difference of L and d can not be less than 1.5 times of suspender belt thickness by suspender belt around mode, get L-d >=12mm;

(2) compact conformation portability is considered, d≤30mm;

(3) controller structure intensity is considered: d >=15mm;

Consider that have is enough margin of safety, answers K >=1.1, so the value of K and d has following recommendation series:

Get L=35mm, d=20mm: $K=\frac{e^{2\mathrm{\α}({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}}{2}=\frac{e^{2\×0.6\×(0.3+0.37)}}{2}=1.1;$

Get L=45mm, d=25mm: $K=\frac{e^{2\mathrm{\α}({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}}{2}=\frac{e^{2\×0.59\×(0.3+0.37)}}{2}=1.1;$

Get L=40mm, d=25mm: $K=\frac{e^{2\mathrm{\α}({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}}{2}=\frac{e^{2\×0.68\×(0.3+0.37)}}{2}=1.2;$

Get L=45mm, d=30mm: $K=\frac{e^{2\mathrm{\α}({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}}{2}=\frac{e^{2\×0.73\×(0.3+0.37)}}{2}=1.3;$

2) strut bar 8 skin friction force is increased

Change surperficial for strut bar 8 decorative chromium into zinc-plated process, increase the roughness of surface of strut bar, surface knurling process etc. can increase its friction coefficient.

Can find out by analyzing, margin of safety K to strut bar 8 surface friction coefficient μ comparatively sensitivity, the roughness of surface increasing strut bar 8 can improve margin of safety K greatly.In addition, apply pressure by pressure zone plate 6 and also can increase friction force.

Select L=45mm in the present embodiment, d=25mm, the zinc-plated process of strut bar, complete priority after producing and carried out pull test and lifted test verifying.Pull test carries out on 1000kN puller system, and single suspender belt is carried as 2 times of rated loads, does not occur skidding.In lifting certification testing, shelter weight is that suspender maximum carries 5t, and when center-of-gravity position is limit bias (the eccentric 1m of length direction, the eccentric 0.5m of Width), suspender belt is working properly does not occur skidding.

Working process of the present invention comprises the following steps:

(1) connect

Be connected with corner fittings on shelter four respectively by shackle by this suspender D type ring 4, main suspension ring 1 are connected with hoist lifting hook.

(2) examination is hung

The length that middle use length adjuster 3 regulates branch's suspender belt 2 is hung in examination, and carry out shelter leveling, control process generally can carry out several repeatedly, until shelter level and each branch suspender belt 2 stress equalization.When regulating the length of branch's suspender belt 2, under branch's suspender belt 2 should be in relaxed state, compression knob 5 is unclamped, pull branch's suspender belt 2 and make itself and length adjuster 3 relative sliding, realize length adjustment (above pulling length adjuster 3, suspender belt can make the length of branch's suspender belt 2 increase, and below pulling length adjuster 3, suspender belt can make the length of branch's suspender belt 2 reduce).After completing length adjustment, compression knob 5 is tightened pressure zone plate 6 is compressed with middle pillar stiffener 8, increase the reliability of suspender.

(3) lift

The stressed tensioning of hoisting process Zhong Ge branch suspender belt 2, above length adjuster 3, suspender belt is individual layer, and stressed is F, and below suspender belt is double-deck, and every layer stressed is F/2, and both differ F/2 makes suspender belt produce the trend of sliding upward.Because each contact site suspender belt is to strut bar 8 mineralization pressure, produce friction force thus, the summation of many places friction force is greater than F/2, limits the slip of branch's suspender belt 2, makes suspender be in stabilized conditions.

Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all embodiments, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.

Claims (4)

1. the length-adjustable shelter Universal hanger of suspender belt, it is characterized in that, comprise: main suspension ring, article at least 4, branch's suspender belt and length adjuster, described in every bar, one end of branch's suspender belt is all connected with main suspension ring, described length adjuster comprises that the adapter plate of both sides and 3 be arranged in parallel and cylindrical support bar connected vertically with the adapter plate of both sides, the other end of described branch suspender belt is connected with the cylindrical support bar of centre after crossing through 3 cylindrical support bars again after D type ring, described length adjuster also comprises pressure zone plate and compresses knob, described compression knob is arranged on the two ends of pressure zone plate and is connected with described adapter plate by screw thread, described pressure zone plate can be pressed on middle cylindrical support bar by rotating described compression knob.

2. shelter Universal hanger according to claim 1, is characterized in that, described main suspension ring are circle suspension ring.

3. shelter Universal hanger according to claim 1, is characterized in that, described branch suspender belt is flat hoisting belts.

4. shelter Universal hanger according to claim 1, is characterized in that, the diameter range of the cylindrical support bar on described length adjuster is 15 ~ 30mm, and the distance range between adjacent supports bar is 35 ~ 45mm.