CN101817470A - Cable for suspension support - Google Patents

Abstract

A kind of cable for suspension support.Embodiments of the present invention are, possess: steel core (13), will be undertaken stranded and constitute by the wire rod that conductive material forms; With a plurality of strands (12), around this steel core, will be undertaken stranded by the wire rod that conductive material forms and constitute with the approximate equality arranged spaced; And resinous buffering covering (15) is set, this resinous buffering covers (15) and is formed by insulating material, around the covering steel core (13), between this steel core (13) and a plurality of strand (12).And, be provided with resinous outer cover (14) of the periphery that covering forms by the set of a plurality of strands (12).And, be provided with the energising detection means (16,17) that detects steel core (13) and have or not energising arbitrarily between the strand (12).

Description

Cable for suspension support

The cross reference of related application: the application is based on the 2009-046020 of Japanese patent application formerly that submitted on February 27th, 2009 and require its preceence, and the latter's full content is incorporated the application by reference into.

Technical field

The present invention relates to a kind of cable for suspension support, for example be used for the car of bucket type lift appliance and the suspention support of balance block etc.

Background technology

General bucket type lift appliance, shown in its summary among Fig. 1 constituted, the hanging wheel 5 that is possessed by winch rope sheave 1, car 2, balance block 3, the wirerope 4 that suspends support usefulness in midair and car 2, balance block 3 constituted.In this bucket type lift appliance, by the friction between winch rope sheave 1 and the wirerope 4, bucket type ground drives car 2 and balance block 3.

At this, wirerope 4 is one of basic elements of character, but in usually using, and the alternating bending by rope sheave 1, hanging wheel 5 etc., and bear friction force from rope sheave 1 is therefore along with aging and intensity takes place reduce.Thus, need be used for the intensity of hawser is remained suitable maintenance management, by checking the degree of injury confirm hawser, and grasp residual intensity or residual life is important.Current general widely used and elevator stipulated by JIS specification (JIS A4302) with the relevant management project of wirerope, managing broken string quantity, abrasion size, the cable diameter of wire rod, the generation state of rust etc.

Yet, in recent years because the raising of environmental consciousness, for elevator also require from Fabrication procedure to use, the re-recognizing of parts that environmental load each operation till discarded is higher.About wirerope,, wish lubricating oil (the hawser grease: (the no fat: greaseless) of minimizing grease) that in waste treatment, spends time from improving the viewpoint of life-span and the reduction environmental load relevant with maintenance.Current, as the structure of the hawser of having sold towards elevator, there is synthetic fibre rope and includes the band (steel band) of steel wire, these can be described as no fat formation.As other disclosed structures, exist resin to cover wirerope etc.

Because the deterioration that also wears out of these no fat hawsers, thus the same with in the past wirerope, also need maintenance management.In the lift appliance that bucket type drives, be intensity and rub resistance power to the desired key property of cable for suspension support.Therefore, because aging deterioration, these hawsers exchange when becoming the state that needing can't to keep performance.So, need the use benchmark (exchange benchmark) in the practicality.

But, under the situation of no fat hawser, because strength member (tensile strength parts) covers by resin, so can't be as hawser before this confirm the damage of wearing out by direct viewing.As the management process of disclosed no fat hawser before this, have following method: cover wirerope for resin, for example shown in Figure 2, the damage that detects outermost cover part is (with reference to the open communique of Japanese Patent: TOHKEMY 2002-348068 communique).

In Fig. 2, cable for suspension support 4 is that the surface of a plurality of electric conductivity wire segments 6 that stranded electric conductivity wire rod is constituted covers and the outer covering 7 of formation with resin.These hawser 4 volumes hang on rope sheave shown in Figure 11 or the pulleys 8 such as deflector sheave (not shown) or other hanging wheels 5.At the pulley 8 of electric conductivity and be all between the wire segment 6 of electric conductivity, be connected with supply unit 9 and amperemeter 10, and detect and have or not energising between this.

Using above-mentioned resin to cover in the lift appliance of wirerope 4, the skin that constitutes by high friction material cover 7 remain sound, for the protection of in-to-in wire segment 6, especially keep bucket type drive in required friction force be important.Method shown here is, when the rooved face of pulleys 8 such as the wire segment 6 of the electric conductivity because aging skin covers 7 wearing and tearing or damage and rope sheave contacted, amperemeter 10 detected energising, and detects the damage of top layer covering.

And as additive method, shown in the TOHKEMY 2004-218147 communique of the open communique of Japanese Patent, having tensile strength parts to hawser is the method that the damage of metal wire rod detects.This method is though that not shown, the intensity that the outermost layer part that makes the metallic wire rod is set reduces and the part of the fracture of going ahead of the rest, and detects the fracture of this part by leakage magnetic field inspection.

But the former method mainly is to detect the damage of outer covering 7 in order to keep friction force.Therefore, can't detect the damage of in-to-in wire segment 6.Generally, the damage of Chan Shenging can be grasped degree of injury by visual observation from the teeth outwards, therefore determines to use benchmark easily.But, in order to keep desirable strength, need to be grasped the damage of hawser in-to-in tensile strength parts, only the method by the former is not enough.

The latter's method is by the flaw detection output of the lower wire rod of the intensity of fracture in advance, to estimate that tensile strength parts integral intensity descends, so can grasp the damage of hawser in-to-in tensile strength parts.But, the lower wire rod of intensity is preferentially ruptured, improve the reliability result who uses benchmark and but cause the life-span of hawser to descend.

Summary of the invention

One aspect of the present invention provides a kind of cable for suspension support that resin covers of having implemented, and can obtain the higher use benchmark of reliability with not reducing the life-span.

According to the embodiment of the present invention, it is characterized in that, possess: steel core, will be undertaken stranded and constitute by the wire rod that conductive material forms; A plurality of strands will be undertaken stranded and constitute by the wire rod that conductive material forms, with the arranged spaced of approximate equality around this steel core; Resinous buffering covers, and is formed by insulating material, cover above-mentioned steel core around, between this steel core and above-mentioned a plurality of strand; Resinous outer the covering covers the periphery that is formed by the set of above-mentioned a plurality of strands; And the energising detection means, detect above-mentioned steel core and have or not energising between the strand arbitrarily.

Description of drawings

Fig. 1 is the pie graph as the lift appliance of the suitable example of cable for suspension support.

Fig. 2 is the figure of explanation prior art.

Fig. 3 is the section drawing of the cable for suspension support of expression first embodiment of the invention.

Fig. 4 is the enlarged drawing in hawser cross section shown in Figure 3.

Fig. 5 represents for the hawser of structure shown in Figure 3 the figure that cushions covering and carried out the result of wear test not to be set.

Fig. 6 is the section drawing of the cable for suspension support of expression second embodiment of the invention.

Fig. 7 is the section drawing of the cable for suspension support of expression third embodiment of the invention.

The specific embodiment

Below, be the cable for suspension support that example describes first embodiment of the invention in detail with the accompanying drawing.

In Fig. 3, cable for suspension support 4 comprises that a plurality of strands 12, steel core 13, resinous outer covering 14 and resinous buffering cover 15.Strand 12 with the wire rod that forms by conductive metal material strandedly concurrently constitute, so-called parallel stranded strand.This strand 12 is the parts of bearing the suspension load of cable for suspension support 4 in the design of elevator, and many are configured to circle-shaped.Steel core (below be also referred to as IWRC (Independent Wire Rope Core: the independent wirerope heart)) 13 and be, constitute with the wire rod that forms by conductive metal material, be configured in the central part that is configured to circle-shaped many strands 12 inboards, play the effect of the diametric compressive deformation that prevents cable for suspension support 4.That is, be as main function, when hawser 4 has been acted on tension force, with many strands 12 by stranded and, keep the position of strand 12 to the center in cross section 6 direction mobile phases opposings, and keep the cross sectional shape of hawser 4.Outer covering 14 is to cover hawser 4 resin coating cover material on every side, covers the periphery that is formed by the set of a plurality of strands 12.It is the resinous parts that formed by insulating material that buffering covers 15, around the covering steel core 13, between this steel core 13 and a plurality of strand 12.That is, be the resin coating cover material that covers IWRC13 in the mode that steel core (IWRC) 13 and strand 12 are separated.

Outer cover 14 frictions of bearing from the groove face of rope sheave etc.And buffering covers 15 frictions of bearing in hawser 4 inside from wire rod.Therefore, be required abrasion resistance respectively, but outer 14 friction force that requirement is stipulated in bucket type drives that cover, the therefore preferred contour friction material of urethanes.On the other hand, the buffering on every side that covers IWRC13 covers 15, in order to alleviate the load (friction) to the wire rod that constitutes strand 12 and IWRC13, the preferably cloth shape covering that is made into by poly-vinyl resin or nylon resin or by mekralon etc., low-friction material constitute.

At this, when car 2 is supported in suspention as shown in Figure 1, use many (among Fig. 2 being 3) hawsers 4 as shown in Figure 2.The skin of these hawsers 4 covers 14 when contacting with rope sheave, produces compressive deformation on the direction of cable diameter.Thick more this distortion of the thickness of outer covering 14 is big more.And this distortion is according to the difference of the tension force that hawser is applied and difference, and tension force aximal deformation value more is also big more.

As mentioned above, using many hawsers 4 in the suspention of car is supported, is that tension force that these many hawsers 4 are applied is impartial mutually ideally.But in fact, the tension force on a plurality of hawsers produces difference, and corresponding with this difference, the deflection of each hawser also produces difference.When the differing greatly of this deflection, the distance of the radial direction till from the centre of gration of rope sheave to the axle center of hawser produces difference.Therefore, the feeding length of the hawser that accompanies with the rotation of rope sheave produces difference, and the Tension Difference between the hawser further changes as a result.Tension Difference between this hawser and change thereof are to the life-span generation harmful effect of hawser.Therefore, advantageous version is less, preferred for this reason outer 14 the thinner thickness that covers.But, require to have friction force between outer covering 14 and the rope sheave, therefore when too thin, skin covers 14 meetings earlier by worn.According to contriver's experiment etc., when the thickness t that makes the outer the thinnest part that covers for roughly 10%～20% time of this hawser external diameter, can satisfy the life-span of abrasion test and the both sides of compress variation, be preferred.

The interval δ at adjacent strand 12 initial stage (making afterwards soon) each other except the diameter of strand 12, is also decided by the diameter of IWRC and the thickness of buffering covering 15.Hawser 4 is, because the tension force when using and a plurality of strand 12 is stranded to the center position of hawser 4, therefore because long-time the use, IWRC13 and buffering cover 15 external diameter and reduce, and strand 12 interval δ each other also reduces.In the hawser 4 of above-mentioned structure, when the wire rod that covers 15 deteriorations, strand 12 and IWRC13 in buffering became state of contact each other, δ roughly became zero at interval, became strand 12 such section constitution that contacts with each other.In addition, before buffering covered 15 deteriorations, outer 14 the part of covering entered between the strand 12, so strand 12 is with respect to stranded and cover 15 and outerly cover 14 part support by buffering.

And in Fig. 3, supply unit 16 and amperemeter 17 are as the energising detection means that has or not energising to detect between steel core 13 and any strand 12 is worked.That is, supply unit 16 is connected in the end of hawser 4 end of its terminals for power supplies with each strand 12, and other end series connection is connected with IWRC13 in the end of hawser 4 via amperemeter 17, detects to have or not energising between them.

At this, the invention provides a kind of structure, in the hawser 14 that resin covers, give the use benchmark that is used to keep desirable strength.That is, provide a kind of structure, when huge damage (being lower than the damage of desirable strength) does not also take place strand 12, be in this situation of state that should exchange to the service personnel notice.

Generally, the strength degradation of elevator cable is caused by following reason: because the flexure stress that volume hangs over rope sheave etc. when going up and applying repeatedly and the friction of the rooved face of rope sheave etc. or the friction between the wire rod, and wire rod breaks.That is, the position of wire rod broken string except making situation such as bad, is the position that (comprising adjacent wire rod) wire rod is applied friction from miscellaneous part.Under the situation of hawser shown in Figure 3 structure, the hawser surface covers 14 protections by skin, does not directly bear friction from the rooved face of rope sheave etc. at wire segment.Therefore, the broken string of wire rod can be described as the friction between the wire rod and the compound action of flexure stress.Wherein roughly be expressed from the next about flexure stress is known.

$\mathrm{\σ}=\frac{\mathrm{Ed}}{D}\·\·\·\left(1\right)$

In above-mentioned (1) formula, σ is a flexure stress, and d is the diameter that constitutes the wire rod of strand 12 or IWRC13, and D is the diameter of the rope sheave hung of volume or hanging wheel etc., and E is a Young's modulus.According to they relation as can be known, gauge or diameter of wire macrobending stress more is serious more.

Relative therewith, friction force be subjected between the wire rod footprint pressure, be that adjacent wire rod area of contact each other influences.Constitute between the wire rod of 1 strand 12 and constitute between heart strand (Fig. 4 18), side strand (Fig. 4 the 19) wire rod of IWRC13, stranded with identical pitch in each strand is spiral fashion, so wire contact mutually.Therefore, strand 12,18,19 in-to-in footprint pressures are lower, are difficult to be subjected to the damage that friction force causes.Relative therewith, between the strand 12 or between IWRC13 and the strand 12, under the wire rod situation about having contacted, strand 12 and IWRC13 are separate, therefore become the point-like contact.Therefore, area of contact is less, and footprint pressure raises, and is subjected to the damage that friction force causes easily.

Ranking test according to the contriver carries out as shown in Figure 5, is not provided with possessing a plurality of strands 12 and IWRC13 in the structure of resin covering, in blacking shown in Figure 5 the wire rod fracture takes place partly.That is, concentrate on strand 12 and the contact portion of IWRC13 and the part that strand 12 contacts with each other.The faulted condition of Fig. 5 illustrates, and as reaching major cause of failure, except the represented flexure stress of (1) formula, the influence of the friction between the wire rod is bigger.

Like this, under strand 12 and IWRC13 state of contact, the intensity of hawser sharply descends and reaches damage.By cover by buffering 15 cover IWRC13 around, the surface pressure of wire rod relaxes significantly, therefore can prevent the broken string that takes place between twisted wire 12 and IWRC13.And, hawser of the present invention, as mentioned above, be before buffering at IWRC13 covers 15 deteriorations, strand 12 and IWRC13 contacts each strand 12 around by the constituting of resin support, and do not have the mode of stronger contact to determine the section constitution size each other with adjacent strand 12.Therefore, can the outermost wire rod of strand fracture in advance owing to the friction between the strand 12.

At this, the buffering of IWRC13 covers 15 by strand 12 and IWRC13 compression, and is subjected to shearing force.This buffering cover 15 on strength of material than the wire rod of strand 12 deterioration earlier.Therefore, the viability of the resin (buffering covers 15) by confirm covering IWRC13 can be confirmed the viability of hawser.Detect by the conducting between the IWRC13 that forms to the strand 12 that forms by conductor wires and by conductor wires, can confirm that the buffering of IWRC13 covers 15 viability.That is, as shown in Figure 3, utilize supply unit 16 and amperemeter 17 and constitute the circuit comprise strand 12 and IWRC13, detect energising by amperemeter 17, hence one can see that, and strand 12 becomes contact condition with IWRC13.Thus, can predict the rapid strength degradation of strand 12, therefore need to exchange hawser 4 as can be known.

Yet the heart strand 18 of IWRC13 shown in Figure 4 and contacting of side strand 19 still become the independently contact between the strand.About surface pressure, the stranding method of general IWRC13 is identical stranded in the same way of the direction of lay with side strand 19 itself, and the curvature of the contact surface between the wire rod descends thus, has realized the mitigation of contact pressure, but owing to be direct contact between the strand, the wire rod fracture may take place.But the function of IWRC13 is to support many strands 12 and maintenance function compressive deformation radially, sectional dimension of minimizing hawser, and hawser single-piece tensile strength is responsible for by many strands 12.Therefore, the wire rod among the IWRC13 ruptures, and some are also no problem.That is, the intensity that will obtain if will deduct the amount of load of IWRC13 from the intensity that comprises whole wire rod amounts that strand 12 is measured is as the intensity of this hawser, and then IWRC13 is also no problem as the decline of tensile strength functions of components because wire rod ruptures.

According to more than, by covering hawser, can relax the load of wire rod with resin, improve the life-span, can get rid of the grease that becomes environmental load simultaneously, and obtain the high use benchmark of reliability.In this formation, improve wire rod intensity more and can access the long life more, the reliability of safety, intensity also can improve.

In addition, the wire rod of strand constitutes to figure 3 illustrates to seal and constitutes, but has utilized the formation of interstitial wire also can access same effect.

Next, utilize Fig. 6 that second embodiment is described.This formation shown in Figure 6 also can access and the identical effect of above-mentioned first embodiment.In Fig. 6, be provided with the skin that covers a plurality of strands 20, IWRC21, hawser periphery and cover 22, this skin covering 22 is preferably the high like that friction of urethanes and has the peucinous outer covering of abrasion test.And, being provided with the buffering on every side that covers IWRC21 and covering 23, this buffering covers 23 and is preferably based on the cloth shape cladded material that poly-vinyl resin or nylon resin or mekralon are made into.These constitute substantially and Fig. 3 and shown in Figure 4 identical.In this second embodiment, between adjacent strand 20, newly disposed the formation difference of buffer unit 24.As this buffer unit 24, use poly-vinyl resin or nylon resin, urethane elastomer etc.

In addition, supply unit 25 and amperemeter 26 are connected between each strand 20 and the IWRC21 in the end of hawser, constitute the situation that member is measured in energising, identical with first embodiment.

According to above-mentioned formation, by detecting energising with amperemeter 26, hence one can see that, and strand 20 becomes contact condition with IWRC21.Thus, can predict the rapid strength degradation of strand 20, therefore need the exchange of hawser as can be known.

In addition, in this formation, also can become following cross-sectional configurations: taken out the gap between the strand 20 under the situation of buffer unit 24, covered 23, make under IWRC21 and strand 20 state of contact having taken out the buffering that covers around the IWRC21, roughly become zero.

According to more than, can relax the load of wire rod, improve the life-span, and obtain the high use benchmark of reliability.

Below, the 3rd embodiment shown in Figure 7 is described.In the 3rd embodiment, be provided with for each of a plurality of strands 27 and outerly cover 29.This skin covers 29 peripheries that cover each strand 27 individually, and the resin that preferably covers the high like that friction of urethanes and have an abrasion test forms.In addition, IWRC28 is set, and the buffering that covers around this IWRC28 is set covers 30, this buffering covers the 30 preferred cloth shape cladded materials that are made into by poly-vinyl resin or nylon resin or mekralon and forms.And, supply unit 31 and amperemeter 32 are connected between each strand 27 and the IWRC28 in the end of hawser, constitute energising and measure member.

Under situation about so constituting, by detecting energising by amperemeter 32, also strand 27 becomes contact condition with IWRC28 as can be known.Thus, can predict the rapid strength degradation of strand 27, therefore need the exchange of hawser as can be known.As a result, can relax the load of wire rod, improve the life-span, and obtain the high use benchmark of reliability.

Claims (10)

1. cable for suspension support is characterized in that possessing:

Steel core will be undertaken stranded and constitute by the wire rod that conductive material forms;

A plurality of strands will be undertaken stranded and constitute by the wire rod that conductive material forms, with the arranged spaced of approximate equality around this steel core;

Resinous buffering covers, and is formed by insulating material, cover above-mentioned steel core around, between this steel core and above-mentioned a plurality of strand;

Resinous outer the covering covers the periphery that is formed by the set of above-mentioned a plurality of strands; And

The energising detection means detects above-mentioned steel core and has or not energising between the strand arbitrarily.

2. cable for suspension support as claimed in claim 1, wherein,

Be following cross-sectional configurations: cover, make under steel core and the strand state of contact in the above-mentioned buffering of having taken out around the steel core, the gap between above-mentioned each strand is roughly zero.

3. cable for suspension support as claimed in claim 1, wherein,

Cover as the buffering around the above-mentioned steel core, use poly-vinyl resin, nylon resin or tectal a certain based on the cloth shape of mekralon.

4. cable for suspension support as claimed in claim 1, wherein,

Between above-mentioned each strand, be provided with a certain padded coaming based on poly-vinyl resin, nylon resin or urethane elastomer.

5. cable for suspension support as claimed in claim 1, wherein,

As above-mentioned outer the covering, be provided with covering based on urethanes.

6. cable for suspension support as claimed in claim 1, wherein,

Make the thickness of the above-mentioned outer the thinnest part that covers be 10%～20% of its external diameter.

7. cable for suspension support is characterized in that possessing:

Steel core will be undertaken stranded and constitute by the wire rod that conductive material forms;

A plurality of strands will be undertaken stranded and constitute by the wire rod that conductive material forms, with the arranged spaced of approximate equality around this steel core;

Resinous buffering covers, and is formed by insulating material, cover above-mentioned steel core around, between this steel core and above-mentioned a plurality of strand;

Resinous outer the covering covers above-mentioned a plurality of strand periphery separately; And

The energising detection means detects above-mentioned steel core and has or not energising between the strand arbitrarily.

8. cable for suspension support as claimed in claim 7, wherein,

Cover as the buffering around the above-mentioned steel core, use poly-vinyl resin, nylon resin or tectal a certain based on the cloth shape of mekralon.

9. cable for suspension support as claimed in claim 7, wherein,

As above-mentioned outer the covering, be provided with covering based on urethanes.

10. cable for suspension support as claimed in claim 7, wherein,

Make the thickness of the above-mentioned outer the thinnest part that covers be 10%～20% of its external diameter.

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