CN209977056U - Crane, tension member, and connection structure of winding jig and core mold assembly - Google Patents

Abstract

The utility model relates to an engineering machine tool field discloses a hoist, is drawn member and winding anchor clamps and mandrel subassembly's connection structure, it includes to draw the member: the core mould component (1), the core mould component (1) includes the intermediate link (11) and sets up the bearing and drawing department (12) in the both ends of the intermediate link (11) separately; and the spiral fiber layer (2) is wound on the tensile part (12) and spirally wound on the outer peripheral surface of the intermediate connecting part (11) continuously and repeatedly by taking the winding position as a folding point. The utility model discloses a tension member and manufacturing approach pass through the spiral winding mode, form the spiral fibrous layer on the mandrel subassembly that has intermediate junction portion, can control fibrous winding prestressing force relatively easily in the winding process to reach the purpose of accurate control winding line type, make fibrous material in the spiral fibrous layer can be relatively even, exert tensile property fully, whole bearing capacity is higher.

Description

Crane, tension member, and connection structure of winding jig and core mold assembly

Technical Field

The utility model relates to the field of mechanical equipment, specifically, relate to a tension member and have its hoist. In addition, the present invention also relates to a coupling structure of a winding jig and a core mold assembly for manufacturing the tension member.

Background

In mechanical equipment, tension members are often used to transmit and apply tension. For example, a load-bearing drawbar (draw plate) is a commonly used tension member in a hoisting apparatus for applying a tensile force in an engineering machine such as a tower crane, a crawler crane, etc., to perform a hoisting function. The performance of the tie rod is critical to the safety performance of the hoisting machinery.

In the conventional technology, the pull rod is mainly made of metal materials such as a steel wire rope, a steel plate and a steel rod. Along with the development of engineering machinery towards product intellectualization, large-scale hoisting and light-weight structure, the defects of the traditional metal pull rod are increasingly shown: in order to meet the requirement of large-load hoisting, the weight of the bearing pull rod is large, more manpower and mechanical assistance are needed in the processes of disassembly, transportation and installation, and the use is inconvenient. In recent years, techniques for manufacturing load-bearing tension rods or enhancing the tensile properties of the load-bearing tension rods by using carbon fiber composite materials have been proposed, so that the portability and the load-bearing capacity of the tension rods can be effectively improved.

Chinese patent CN102837453B proposes a tension member, a method for manufacturing the same, and an engineering machine, wherein the tension member includes a middle portion and connecting portions disposed at both ends of the middle portion. In the preparation process, two cores are oppositely fixed on a winding machine at intervals, and then the infiltrated carbon fiber precursor is transversely wound on the two cores, and the presoaked precursor tows are arranged along the horizontal direction; and longitudinally winding the transversely wound raw filament bundle by using prepreg raw filaments so as to enable the carbon fibers to be tightly combined to form an intermediate member which is provided with cores, carbon fiber composite material layers coated on the surfaces of the cores and carbon fiber composite material bodies positioned between the cores. The intermediate member is heated and cured, and is coated with the buffer layer for waiting, so that the tension member with light weight and high strength is prepared.

The Chinese patent CN103058073B discloses a method for manufacturing a carbon fiber composite pulling plate, which is characterized in that a hollow thin-wall-shaped end connecting piece cast by titanium alloy is utilized, carbon fiber tows are wound on the surfaces of two end connecting pieces, and then transverse pressure is applied to the carbon fiber tows between the two end connecting pieces, so that the carbon fiber tows are tightly attached to the end connecting pieces. In the winding process, the tension of the carbon fiber tows is controlled in a closed loop mode, namely the initial tension is 1KN/m, the tension is controlled to be gradually reduced in the winding process, so that the internal stress of the formed pulling plate is uniform, and each layer of carbon fiber tows can play a role in loading. After pressurization and solidification, carbon fiber cloth belts forming an angle of +135 degrees and an angle of +45 degrees with the pulling plate are alternately wound in the middle of the pulling plate so as to resist the transverse tension when the pulling plate is pulled and bear a certain torsional load.

The Chinese patent application CN102927117A discloses an engineering machinery bearing pull rod made of carbon fiber composite material, which comprises a steel core and a carbon fiber composite material layer coated on the outer surface of the steel core, wherein the steel core comprises steel pull rings arranged at the head end and the tail end, and a steel reinforcing connecting member is arranged between the steel pull rings. In the manufacturing process, the carbon fiber composite material layer is coated on the surface of the steel core in a layer laying mode, and an air bag is sleeved and vacuumized after the layers are laid so as to ensure that the resin is uniformly distributed.

The above prior art can be broadly divided into two broad categories: the method is based on two end connectors, firstly, fiber tows are transversely wound, and then the transversely wound fibers are tightly attached to each other or the end connectors in a longitudinal winding or acting force applying mode; and the other type is that a connecting piece is arranged between the two end connecting pieces to serve as a fiber layer forming foundation, and the carbon fiber composite material layer is coated on the surface of the whole steel core in a laying mode.

In order to provide a more ideal fiber composite tie rod, so that the fiber material can relatively fully exert the tensile function thereof when bearing load, the two types of prior art provided the tie rod and the manufacturing method thereof have defects in manufacturability and load-bearing capacity.

The former relies on external forces exerted by longitudinally wound fibers (hoop fibers) and the like to ensure that different transverse carbon fibers can exert relatively consistent tension effects during the load bearing process, which can only reduce the difference to a certain extent for the fiber materials of different wound layers, resulting in the maximum load bearing capacity of the tie rod being limited. Therefore, the tension of the carbon fiber tows needs to be gradually reduced in the winding process, the control difficulty is high, and the production efficiency is severely restricted. In addition, because only two end connecting pieces are used as the basis of forming the fiber layer (fiber body), the size and the precision of the fiber tows are difficult to ensure in the winding process, and the winding control difficulty is further increased.

Although the steel core with the intermediate connecting piece is provided in the latter, the carbon fiber composite material layer is formed in a laying mode, and after subsequent process steps of vacuumizing, heating and curing and the like, the uniform distribution of the fiber threads cannot be basically guaranteed, so that the bearing capacity of the manufactured pull rod is affected.

In view of the above, the present invention is directed to overcoming, at least in part, the above-mentioned deficiencies in the prior art.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a tension member and a method for manufacturing the same, which has excellent load-bearing capacity and excellent manufacturability and can be applied to a mechanical device such as a crane as a load-bearing tension bar.

In order to achieve the above object, a first aspect of the present invention provides a tension member, including: the core mould component comprises a middle connecting part and pull-bearing parts respectively arranged at two ends of the middle connecting part; and the spiral fiber layer is wound on the tensile part and spirally wound on the peripheral surface of the intermediate connecting part continuously and repeatedly by taking the winding position as a folding point.

Preferably, a groove for accommodating the spiral fiber layer is formed on the outer edge of the tensile part, and the spiral fiber layer is hooked around the outer edge of the tensile part and accommodated in the groove at the position of the hook.

Preferably, the groove includes a circular arc portion facing away from the intermediate connection portion and a constricted portion linearly transitioning from the circular arc portion to the intermediate connection portion at an angle that is tangent to the circular arc portion and that is equal to the helix angle α of the helical fiber layer wound around the intermediate connection portion with respect to the central axis of the intermediate connection portion.

Preferably, the tensile member is formed with a connecting portion mounting hole and a threaded fastener mounting hole, and the intermediate connecting portion is inserted into the connecting portion mounting hole and fixed by a threaded fastener mounted to the threaded fastener mounting hole.

Preferably, a fiber grating sensor is embedded in the spiral fiber layer, and the arrangement angle of the fiber grating sensor is equal to the helix angle α of the spiral fiber layer wound on the intermediate connection part.

Preferably, the bearing and pulling part is provided with a lightening hole and a line passing hole which penetrates and extends from the lightening hole, and the fiber grating sensor leads out an optical fiber connector to the lightening hole through the line passing hole.

Preferably, the bearing and pulling part is formed with a bearing through hole, and two sides of one end of the lightening hole close to the bearing through hole are formed with arc-shaped concave parts which are symmetrical to each other and used for positioning a winding clamp.

Preferably, the intermediate connecting portion is formed as a cylindrical hollow metal rod having an outer diameter of 12mm to 50mm and a wall thickness of 2mm to 10 mm.

Preferably, the helical angle α at which the helical fibre layers are wound around the intermediate connecting portions is set such that the number n of fibre helices corresponding to the length of the intermediate connecting portions between the tensile sections is a positive integer.

Preferably, the spiral fiber layer is externally wound with a circumferential fiber layer.

Preferably, a spiral turbulent flow wire harness is wound on an extending part of the tension member between the two tensile parts, the spiral turbulent flow wire harness is formed by winding fiber yarns, and/or the radial protruding height of the spiral turbulent flow wire harness is 2 mm-5 mm.

Preferably, the tension member is a load-bearing tension rod used in a hoisting apparatus, and the tension portion includes a pair of tension rings connected to both ends of the intermediate connection portion, respectively, around which the spiral fiber layer is hooked.

A second aspect of the present invention provides a crane including the tension member described above.

The third aspect of the utility model provides a connection structure of winding anchor clamps and mandrel subassembly, the mandrel subassembly includes intermediate junction portion and the portion of drawing of holding that is connected to this intermediate junction portion both ends respectively, should hold the portion of drawing and be formed with and bear the through-hole, the winding anchor clamps be equipped with bear through-hole complex round pin post, in order to drive the mandrel subassembly rotate for with the fibre silk thread spiral winding in on the outer peripheral face of intermediate junction portion.

Load-bearing draw bars for e.g. construction machines are usually elongated structures with a large aspect ratio, and in order to fully exploit the high strength properties of the fibre material, a precise control of the winding pattern is required. The utility model discloses a tension member and manufacturing approach pass through the spiral winding mode, form the spiral fibrous layer on the mandrel subassembly that has intermediate junction portion, can control fibrous winding prestressing force relatively easily in the winding process to reach the purpose of accurate control winding line type, make fibrous material in the spiral fibrous layer can be relatively even, exert tensile property fully, whole bearing capacity is higher.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a perspective view illustrating a tension member according to a preferred embodiment of the present invention;

fig. 2 is a schematic view illustrating a core mold assembly of a tension member according to the present invention;

fig. 3 is a schematic structural view of a pull ring of a core mold assembly according to a preferred embodiment of the present invention;

fig. 4 is a schematic structural view of a winding jig according to a preferred embodiment of the present invention;

fig. 5 is a schematic view showing a coupling structure of the winding jig and the core mold assembly of fig. 4;

fig. 6 is a schematic view of two mounting modes of the winding jig and core mold assembly of fig. 4;

FIG. 7 is a schematic front view of step S1 of winding to form a spiral fiber layer;

fig. 8 is a schematic top view of the winding substep S11 in the step S1 of winding to form a spiral fiber layer;

fig. 9 is a schematic top view of the winding substep S12 in the step S1 of winding to form a spiral fiber layer;

FIG. 10 is a schematic diagram showing the arrangement of fiber grating sensors in a tension member;

FIG. 11 is a schematic front view of a spiral fiber layer after winding;

fig. 12 is a schematic top view of a spiral fiber layer after winding.

Description of the reference numerals

1-a core mould assembly; 11-an intermediate connection; 12-a tensile part; 121-grooves; 122-connector mounting holes; 123-threaded fastener mounting holes; 124-lightening holes; 124 a-arc concave part; 125-wire through hole; 126-a load-bearing via; 2-a layer of helical fibres; 3-a fiber grating sensor; 31-a fiber optic splice; 4-spiral turbulence wire harness; 5-winding the clamp; 51-pin; 52-end round bar; 53-bar steel; 54-bolt through hole.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

It should be noted that, the tension member of the present invention refers to a force-bearing member for bearing axial tension, and may be used in engineering machinery such as a crane, for example, a load-bearing pull rod in a crane. Although the tension member of the present invention will be described in the following description mainly using a load-bearing tension rod applied to a crane as an example, the tension member of the present invention may also be a member for transmitting or applying a tensile force applied to other mechanical devices. In the crane, a load-bearing stay has a pull ring (refer to the load-bearing portion 12 shown in fig. 1) at both ends thereof, and the pull ring has a connection structure such as a load-bearing through hole 126 for connecting adjacent members or loads when bearing load. In this case, the load-bearing pull rod mainly bears the axial tensile force applied by the pull ring during the working process, and the load-bearing capacity of the load-bearing pull rod is mainly reflected in the magnitude of the axial tensile strength.

Based on the characteristics of the working condition, the carbon fiber is arranged to be transversely wound (the fiber direction is along the axial direction of the pull rod) in the prior art so as to fully exert the tensile property of the carbon fiber. However, this thinking set neglects the effect of winding accuracy on load bearing capacity: the whole bearing capacity of the bearing pull rod depends on the tensile capacity exerted by each bundle of fiber materials in the bearing process, and whether the fiber materials can exert sufficient tensile capacity depends on the arrangement direction of the fiber materials and is influenced by the arrangement uniformity and the winding prestress consistency to a great extent. If the difference between the magnitude and the timing of the tensile stress generated by different fiber materials in the bearing process is large, the overweight load can cause 'individual damage' to different fiber materials, and finally the tension rod cannot exert the designed bearing capacity.

The utility model discloses an inventor breaks through this kind of thinking trend, has originally provided the winding shaping mode of fibre spiral, has effectively improved the bearing capacity who bears the weight of the pull rod. The structure of the tension member provided in the present invention will be described below with reference to the manufacturing method thereof, and also provides a coupling structure of a winding jig and a core mold assembly for implementing the manufacturing method.

Referring to fig. 1, 2, and 10 to 12, a tension member according to a preferred embodiment of the present invention includes a core mold assembly 1 and a spiral fiber layer 2. Wherein, the core mold assembly 1 includes an intermediate connection part 11 and pull-up parts 12 formed as a tab and provided at both ends of the intermediate connection part 11, the pull-up parts 12 may be formed integrally with the intermediate connection part 11 or connected to the intermediate connection part 11; the spiral fiber layer 2 is wound around the tensile part 12 and spirally wound on the outer peripheral surface of the intermediate connecting part 11 continuously and reciprocally with the winding position as a folding point. As will be understood in conjunction with the description of the manufacturing method that follows, the hooking and spirally winding of the spiral fiber layer 2 with the core mold member 1 here means that the fiber yarn is wound at a predetermined helix angle from the first end of the intermediate connecting portion 11 where the tensile portion 12 is provided to the second end where the other tensile portion 12 is provided, and is returned with the tensile portion 12 as a fulcrum while being wound to the position of the tensile portion 12, so that the fiber yarn is continuously wound from the second end to the first end, and so on. In the present invention, "continuously and reciprocally spirally winding" is not limited to the case where all the fiber threads of the spiral fiber layer 2 are wound at one time. Depending on the length of the fibres used, after a group of fibres has been used up after winding a number of times in a reciprocating manner, the next group of fibres can be replenished, whereby the layer of spiral fibres 2 has "breakpoints" which are almost unavoidable in the entire layer of spiral fibres 2, but which can be avoided by a reasonable setting of the length of each group of fibres from having a significant influence on the load-bearing capacity of the tension member.

The tension member of the present invention winds the fiber material spirally around the core mold assembly 1. Compare in prior art's bearing pull rod and manufacturing method, the utility model discloses can use the intermediate junction portion 11 of mandrel subassembly 1 as the winding basis in the manufacturing process who bears the pull rod, the size and the winding precision of the winding fiber material of the accurate control of being convenient for spiral fiber layer 2 equipartition twines on intermediate junction portion 11 between the pull ring. The structure and the manufacturing method can relatively easily control the winding prestress of the fibers, so that the fiber materials in the spiral fiber layer 2 can relatively uniformly and uniformly exert the tensile property fully, and the whole bearing capacity is higher. In order to obtain the bearing pull rod with the same bearing capacity, the utility model discloses a fibre reinforced pull rod manufacturing process nature is better, can produce high-efficiently.

Core mould assembly

Fig. 2 shows a core mold assembly 1 which may be used in a tension member of the present invention, including an intermediate connection part 11 formed in a cylindrical shape and a tensile part 12 formed as a pull ring.

The intermediate connecting portion 11 may be an elongated round bar shape. In order to achieve the purpose of light weight design, the intermediate connection portion 11 may be made of a light metal material such as an aluminum alloy, a magnesium alloy, or a titanium alloy. The intermediate connecting portion 11 may be a hollow pipe, and may have an outer diameter of 12mm to 50mm and a wall thickness of 2mm to 10mm, for example, according to the load requirement and the design size. It can be seen that in this preferred embodiment, the tension member of the present invention will bear the load mainly with the fiber material, while the intermediate connection 11 between the pulling loops is provided only for better winding of the fiber material, allowing for a light weight design. In other alternative embodiments, the intermediate connection portion 11 may be formed of other materials, or may be configured to have a larger radial dimension (outer diameter or wall thickness) to enable load sharing at least in part; and the wound spiral fiber layer 2 can be used as a reinforcing material, so that the bearing capacity of the pull rod is obviously improved. The intermediate connection portion 11 may be formed to have another suitable shape.

The carrier 12 is required to connect adjacent members or loads during load bearing, and serves as a winding base for the spiral fiber layer 2 during manufacturing, and may also be made of metal. Figure 3 shows a preferred construction of a tab which can be used as a carrier 12 in the manufacture of a load-bearing pull rod for use in a crane, the outer edge of which tab is formed with recesses 121, the number, depth and width of which recesses 121 can be determined according to the amount of fibre to be wound. Thus, the spiral fiber layer 2 can be placed in the groove 121 when being wound on the tab, and can be coiled along the groove 121 at the outer edge of the tab, so that the winding and the folding back are realized. Through setting up this recess 121, not only can avoid spiral fiber layer 2 to break away from the pull ring, can also avoid guaranteeing life because of collision, friction etc. to the wearing and tearing that the fibrous material that colludes the position led to the fact in the use. It will be appreciated that although only one recess 121 is shown formed in the tab, the recess 121 may be divided into a plurality of recesses for receiving fibrous material.

It should be understood that, for convenience of description, the present invention uses terms such as "outer peripheral surface" and "outer edge" to describe the arrangement of the spiral fiber layer 2. The outer peripheral surface of the intermediate connection portion 11 refers to a peripheral surface surrounding a central axis of the intermediate connection portion 11, and the intermediate connection portion 11 may have a shape such as the aforementioned round bar shape or the regular prism shape. When the intermediate connecting portion is formed in a shape other than a rod shape, the extending direction from one of the tensile members 12 to the other tensile member 12 may be defined as an axial direction, and the central axis thereof is a line connecting the central points of the cross section perpendicular to the axial direction. The outer edge of the tab comprises at least that part of the outer contour of the end of the tab facing away from said intermediate connection 11 through which the centre axis of the intermediate connection 11 extends. Typically, the tab shown in fig. 2 and 3 is formed as a flat structure having a connecting structure such as a load-bearing through-hole 126, and the outer edge of the tab surrounds the load-bearing through-hole 126 and is formed with a recess 121.

The recess 121 comprises a circular arc portion facing away from the intermediate connection portion 11 and a converging portion linearly transitioning from the circular arc portion to the intermediate connection portion 11 at an angle tangent to the circular arc portion equal to the pitch angle α of the helical fibre layer 2 with respect to the central axis of the intermediate connection portion 11. Through the arrangement, the fiber silk threads can be tightly attached to the bottom of the groove 121, the spiral fiber layer 2 can be uniformly stressed, and the bearing capacity of the pull rod is improved.

As mentioned above, the intermediate connecting portion 11 may be connected to or formed integrally with the carrier portion 12, and the intermediate connecting portion 11 may be connected to the carrier portion 12 by any suitable means, such as welding, plugging, bonding, etc. In order to avoid the influence to the fibre winding precision because of the thermal deformation, the utility model discloses an optimal selection scheme adopts the threaded connection mode. Specifically, the ends of the carrier portions 12 opposite to each other are formed with link mounting holes 122, and the intermediate links 11 are insertable into the link mounting holes 122. The coupling part mounting hole 122 may be a blind hole having a depth of, for example, 20mm or more, and both sides thereof are formed with threaded fastener mounting holes 123, whereby the intermediate coupling part 11 inserted into the coupling part mounting hole 122 may be fixed to the carrier part 12 using a threaded fastener (e.g., a bolt) mounted into the threaded fastener mounting holes 123. In other embodiments, the intermediate connection portion 11 may also be directly screwed to the carrier portion 12. By using the core mold assembly 1 designed to be detachable, mass production and assembly of parts can be facilitated, which contributes to improvement in production efficiency.

Typically, the carrier section 12 is connected to an adjacent component or load by a pin and thus may have a load bearing through hole 126 formed therein. The axis of the bearing through hole 126 may be perpendicular to the central axis of the intermediate connecting portion 11, and may be disposed near the circular arc portion of the groove 121. As shown in fig. 5, the bearing through hole 126 may also be a structure cooperating with the winding jig 5, and the pin 51 of the winding jig 5 penetrates into the bearing through hole 126 to complete the filament winding by driving the rotation thereof.

In addition, the bearing and pulling part 12 can be formed with lightening holes 124, threading holes 125 and the like, and the lightening holes 124 can be approximately U-shaped, so that the self weight of the pull rod can be reduced conveniently; the wire through hole 125 may be plural for leading out a terminal of the sensor in a preferred embodiment described later. In the carrier portion 12 formed as a tab shown in fig. 3, the lightening holes 124 are formed with arc recesses 124a symmetrical to each other on both sides of one end thereof near the bearing through hole 126, and can be positioned and fixed by engaging with a bolt or the like (see fig. 5) when fixed with the winding jig 5. The winding jig 5 can firmly fix the core mold assembly 1 through the bearing through hole 126 and the pair of arc recesses 124a, and the bolts extending through the arc recesses 124a can clamp the pull ring, so that the core mold assembly 1 is prevented from shaking when fibers are wound, and good winding quality is ensured. The illustrated circular arc recess 124a may be replaced with a through hole as shown in fig. 2, but the through hole is designed to ensure high dimensional accuracy so as to be able to easily fit with the winding jig 5. Alternatively, the circular arc recessed portions 124a may be formed at other positions in the lightening holes 124.

Winding clamp

Fig. 4 shows a winding jig 5 for performing a filament winding process in manufacturing the tension member of the present invention, which can be engaged with a pull ring of the core mold assembly 1. The winding jig 5 includes an end round bar 52, a bar 53, and a pin 51 and a bolt through hole 54 provided on the bar 53. Wherein, the end round rod 52 extends to the side far away from the pin 51, and is used for being connected to the winding mandrel of the winding machine, so as to drive the mandrel assembly 1 to rotate, and spirally wind the spiral fiber layer 2 to the intermediate connection part 11. The bar 53 has a suitable extension so that the pin 51 is spaced from the end rod 52 to avoid interference during winding.

Importantly, the pin 51 of the winding jig 5 extends in a direction perpendicular to the plate surface of the bar 53 and is capable of engaging with the load-bearing through-hole 126 of the tab, thereby eliminating the need for additional attachment structure on the tab. As shown in fig. 3 to 5, the bolt passes through the bolt through hole 54 and extends to the lightening hole 124 of the tab, and abuts against the arc recess 124, and is fixed on the other side of the tab by the nut. Therefore, the pin 51 and the two bolts are respectively matched with the bearing through hole 126 and the arc concave part 124 to form three-point positioning, the core mold assembly 1 can be stably fixed, vibration is avoided in the rotating process, and the winding quality is ensured.

It will be appreciated that the winding jig 5 and corresponding cooperating formations on the tab may be formed in other ways to effect winding. For example, in the core die assembly 1 shown in fig. 2, bolts are passed through the bolt through holes 54 on the bar 53 and the corresponding through holes on the tab to fix the core die assembly 1 to the winding mandrel of the winding machine. As another example, the winding jig 5 may have a pair of bar steels 53 oppositely disposed with a through hole formed therein for the pin 51 to pass through, and have the pin 51 removably fitted thereto to fix the core mold assembly 1 through the bearing through hole 126 on the tab.

Fig. 6 shows two different installation manners of the core mold assembly 1 and the pair of winding jigs 5, one of which fixes the core mold assembly 1 to the same side of the winding jig 5 (winding jig axisymmetrically installed) and the other of which fixes the core mold assembly 1 to the opposite side of the winding jig 5 (winding jig centrosymmetrically installed), both of which can perform the filament winding process. In other embodiments, the pull rings disposed at both ends of the intermediate connection portion 11 may also be mounted with an angle relative to each other (i.e. one of the pull rings is rotated with respect to the other about the central axis of the intermediate connection portion 11 with an angle), whereby the winding clamps 5 at both ends do not have an axisymmetric or centrosymmetric relationship.

The connection structure formed by the winding jig 5 and the core mold assembly 1 can conveniently perform the fiber winding process, thereby preparing the tension member provided by the present invention. Specifically, the connection structure may be fixed to a winding mandrel of a winding machine by a winding jig 5 and driven to rotate by the winding machine, thereby spirally winding the fiber material.

Winding process and manufacturing method

The fiber winding is a key step in the tension member manufacturing method, and the winding quality of the spiral fiber layer 2 has an important influence on the load bearing capacity of the tension member. In the following description of the winding process, a step of forming the spiral fiber layer 2 (referred to as "step S1") in the method of manufacturing the tension member will be mainly described, and a further preferred embodiment of the tension member will be provided. In the field of cranes, such tension members are essentially constructed as fiber composite tension rods, since they are wound with fiber material.

As shown in fig. 7 to 9, the winding process fixes the core mold assembly 1 to the same side of the winding jig 5 (the winding jig is installed axisymmetrically), and fixes the core mold assembly 1 to the winding mandrel of the winding machine by means of the winding jig 5, thereby enabling the core mold assembly 1 to be rotated. After the fiber yarn is impregnated with the epoxy resin, the fiber yarn is wound around the core mold assembly 1 by a yarn feeding mechanism such as a yarn feeding nozzle to form a spiral fiber layer 2 and a circumferential fiber layer, etc., which will be described later. In the process, the fiber yarn can keep 10 MPa-50 MPa of prestress so as to fully exert the tensile property after forming.

In order to enable the fiber yarn to smoothly transit into the groove 121 of the tensile member 12 when being wound around the end of the intermediate connecting portion 11, it is necessary to set the helix angle α of the helical fiber layer 2 so that the number n of fiber helices corresponding to the length portion of the intermediate connecting portion 11 between the tensile members 12 is a positive integer, that is, it is satisfied that:

l n 2a nd formula 1

Where L is the length of the intermediate connecting part 11 between the pull rings 12, n is the number of fiber spirals of a single layer of fiber yarn over that length, d is the fiber pitch, and a is half the fiber pitch. In the case where the intermediate connection portion 11 is formed in a cylindrical shape, the helix angle α of the spiral fiber layer 2 may be determined by equation 2:

where D is the outer diameter of the intermediate connecting portion 11. Therefore, the selectable value (positive integer, such as 8, 9, etc.) of the number n of the fiber spirals can be determined first, and then several specific spiral angles selectable for the fiber winding can be calculated, and the spiral angle α of the spiral fiber layer 2 can be determined by combining the rotating speed of the winding machine, the wire feeding speed of the wire feeding mechanism, and the like.

As described above, the working load of the tension member according to the present invention during operation is mainly borne by the spiral fiber layer 2, and the amount of winding thereof directly determines the load-bearing capacity of the tension member. Therefore, the fiber usage K (the number of fiber bundles to be wound) needs to be determined according to factors such as the design rated load P, the winding helix angle α, the bearing capacity f of the single fiber yarn and the like, and the calculation relationship is as follows:

the determination of the helical angle alpha can lead the fiber silk thread to smoothly transit to the pull ring, thus being beneficial to improving the winding quality and efficiency. However, as shown in fig. 8, this winding results in a concentrated distribution of the fiber filaments on one side within the groove 121 of the tab. For this reason, the step S1 of forming the spiral fiber layer 2 may be divided into two sub-steps. After completing the winding substep S11 (winding K/2 bundles) shown in fig. 8, the relative connection orientation of the mandrel assembly 1 and the winding jig 5 is turned so that the tab faces the winding jig 5 on the side facing away from (the bar 53 of) said winding jig 5 in the winding substep S11, thereby performing another winding substep S12 shown in fig. 9, completing the winding of the remaining K/2 bundles of fiber filaments so that the fiber filaments are uniformly hooked around the tab, resulting in the winding effect shown in fig. 12. Change or transfer mandrel subassembly 1 and winding anchor clamps 5 relative connection position can be realized through following mode at least: with winding jig 5 held stationary, core mold assembly 1 having completed winding substep S11 is removed from winding jig 5 and then reattached to winding jig 5 by rotating it 180 ° about the central axis of core mold assembly 1 or an axis extending into the plane of the vertical page in fig. 8, thereby completing the change in the relative attachment orientation of core mold assembly 1 to winding jig 5. By changing the relative connection position of the two, the fiber silk threads can be prevented from being intensively distributed on one side in the groove 121 of the pull ring, so that the fibers are wound more uniformly.

As shown in fig. 10, a fiber grating sensor 3 may be embedded in the spiral fiber layer 2 for accurately detecting the load. The fiber grating sensor 3 may be wound with the fiber thread on the intermediate connection 11 during the formation of the spiral fiber layer 2. Specifically, in the above-described winding sub-step S11, when the fiber wire is wound by half (K/4), two fiber grating sensors 3 are arranged at the midpoint position of the intermediate connection portion 11, which are located opposite to each other on the same diameter, and are arranged at an angle equal to the helix angle α of the helical fiber layer 2. Thereafter, in another winding sub-step S12, when the fiber wire is wound by half, the other two fiber grating sensors 3 are arranged such that the circumferential positions of the four fiber grating sensors 3 are evenly distributed. The arrangement angle of the fiber grating sensor 3 of the present invention refers to the spiral angle of the grating direction relative to the intermediate connection portion 11. In other embodiments, the tension member of the present invention may also be provided with two or six fiber grating sensors 3.

The fiber grating sensor 3 can lead the fiber connector 31 out to the lightening hole 124 through the wire passing hole 125 formed on the pull ring. Therefore, in the subsequent use process, the fiber bragg grating sensor can be connected with a regulator of the control chamber through the optical fiber, and the relation between the wavelength variation mean value of the fiber bragg grating sensor 3 and the stress load of the pull rod is analyzed, so that the load size can be detected in real time.

The utility model discloses a spiral winding mode can effectively promote the bearing capacity who is drawn the component. In order to further improve and produce property ability, the utility model discloses can also twine the hoop fibre layer outside spiral fibre layer 2. In particular, after the winding of the spiral fiber layer 2 is completed, the winding of the fiber yarn is continued between the two pull rings at an angle close to 90 °, whereby the spiral fiber layer 2 can be made to closely fit the intermediate connection 11, in particular to ensure a degree of fit close to the position of the pull rings. In addition, this hoop fibrous layer can also play the guard action to spiral fibrous layer 2, and its thickness can be 1mm ~ 5mm, guarantees life.

Due to the light weight of the tension members, the tension members may be affected by wind and rain excitation during use. For this reason, in a preferred embodiment of the present invention, a spiral spoiler harness 4 is further wound around an extension of the intermediate connection portion 11 between the two tabs, as shown in fig. 1. The spiral turbulence wire harness 4 may be formed by winding fiber yarns, and/or the radial protrusion height may be 2mm to 5mm, and the thread pitch may be 40mm to 400 mm. Through setting up spiral vortex pencil 4, can be in the utility model discloses a tension member produces the turbulent effect of air to the air current when receiving the air current effect to resist the influence of wind and rain excitation.

After the fiber winding is finished, the fiber threads which are pre-soaked can be fixedly connected to the core mold component 1 through rotating and room temperature curing and/or thermal curing, and finally the fiber composite pull rod with good bearing capacity and manufacturability is formed, and can be used for lifting heavy objects in a crane.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.

In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.

Claims (13)

1. A tension member, comprising:

the core mould component (1), the core mould component (1) includes the intermediate link (11) and sets up the bearing and drawing department (12) in the both ends of the intermediate link (11) separately;

and the spiral fiber layer (2) is wound on the tensile part (12) and spirally wound on the outer peripheral surface of the intermediate connecting part (11) continuously and repeatedly by taking the winding position as a folding point.

2. A tension member as claimed in claim 1, wherein the outer edge of the tensile member (12) is formed with a groove (121) for receiving the spiral fiber layer (2), and the spiral fiber layer (2) is hooked around the outer edge of the tensile member (12) and received in the groove (121) at the hooked position.

3. A tension member according to claim 2, characterized in that the groove (121) comprises a circular arc portion facing away from the intermediate connection portion (11) and a converging portion which transitions linearly from the circular arc portion to the intermediate connection portion (11) obliquely at an angle which is tangent to the circular arc portion and which is at an angle of inclination relative to the central axis of the intermediate connection portion (11) equal to the helix angle a at which the helical fiber layer (2) is wound around the intermediate connection portion (11).

4. The tension member according to claim 1, wherein the tension portion (12) is formed with a coupling portion installation hole (122) and a threaded fixture installation hole (123), and the intermediate coupling portion (11) is inserted into the coupling portion installation hole (122) and fixed by a threaded fixture installed into the threaded fixture installation hole (123).

5. A tension member according to claim 1, wherein a fiber grating sensor (3) is embedded in the spiral fiber layer (2), the fiber grating sensor (3) being arranged at an angle equal to the helix angle α of the spiral fiber layer (2) wound around the intermediate connection portion (11).

6. A tension member according to claim 5, wherein the tension bearing portion (12) is provided with lightening holes (124) and a wire passing hole (125) extending therethrough from the lightening holes (124), the fiber grating sensor (3) leading out a fiber stub (31) to the lightening holes (124) through the wire passing hole (125).

7. A tension member as claimed in claim 6, wherein the carrier portion (12) is formed with a load-bearing through-hole (126), and both sides of one end of the lightening hole (124) near the load-bearing through-hole (126) are formed with arc-shaped recesses (124a) symmetrical to each other for positioning a winding jig (5).

8. A tension member according to claim 1, wherein the intermediate connection portion (11) is formed as a cylindrical hollow metal rod having an outer diameter of 12mm to 50mm and a wall thickness of 2mm to 10 mm.

9. A tension member according to claim 1, characterized in that the helix angle a at which the helical fibre layers (2) are wound around the intermediate connection portions (11) is set such that the number n of fibre helices corresponding to the length portion of the intermediate connection portions (11) between the tensile portions (12) is a positive integer.

10. The tension member as claimed in any one of claims 1 to 9, wherein the tension member is wound with helical spoiler strands (4) at an extension thereof between the two tensile pockets (12), wherein the helical spoiler strands (4) are wound with fiber filaments, and/or wherein the helical spoiler strands (4) have a radial protrusion height of 2mm to 5 mm.

11. A tension member according to any one of claims 1 to 9, characterized in that the tension member is a load-bearing tension rod for use in hoisting equipment, and the tensile portion (12) comprises a pair of tension rings connected to the ends of the intermediate connection portion (11), respectively, around which the spiral fibre layer (2) is hooked.

12. A crane, characterized in that the crane has a tension member according to any one of claims 1 to 11.

13. The utility model provides a connection structure of winding anchor clamps and mandrel subassembly, its characterized in that, mandrel subassembly (1) includes intermediate junction portion (11) and holds and draw portion (12) that are connected to this intermediate junction portion (11) both ends respectively, should hold and draw portion (12) and be formed with and bear through-hole (126), the winding anchor clamps be equipped with bear through-hole (126) complex round pin post (51), in order to drive mandrel subassembly (1) rotate for with fibre silk thread spiral winding in on the outer peripheral face of intermediate junction portion (11).

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