阅读说明：本技术 一种张拉可控的绳索连接装置及设计方法 (Tension-controllable rope connecting device and design method ) 是由 曹飒飒 邵晨曦 纪泓言 于 2020-12-28 设计创作，主要内容包括：本发明公开了一种张拉可控的绳索连接装置,包括连接板、金属扣、绳索和螺栓,所述连接板通过绳孔安装于绳索,所述绳索的两端均设有环形索,所述环形索的直径大于绳孔的直径,所述金属扣安装于环形索,两块所述连接板靠近环形索的一面通过螺栓连接。本发明可以实现随时解开、闭合环形SMA索,可以解决现场压制索接头时的操作空间不足问题；张拉应力可控性好,通过对螺母的收紧实现SMA索的预张拉,控制效果较准确；连接稳定性好,索的接头采用压力机压制,稳定可靠,张拉过程中在连接点SMA索不会产生相对滑动。(The invention discloses a tensioning-controllable rope connecting device which comprises connecting plates, metal buckles, ropes and bolts, wherein the connecting plates are installed on the ropes through rope holes, annular ropes are arranged at two ends of each rope, the diameter of each annular rope is larger than that of each rope hole, the metal buckles are installed on the annular ropes, and one surfaces, close to the annular ropes, of the two connecting plates are connected through the bolts. The invention can realize the opening and closing of the annular SMA cable at any time and solve the problem of insufficient operation space when the cable joint is pressed on site; the tension stress controllability is good, the pretensioning of the SMA cable is realized by tightening the nut, and the control effect is more accurate; the connection stability is good, the joints of the cables are pressed by a press machine, the stability and the reliability are good, and the SMA cables cannot slide relatively at the connection points in the tensioning process.)

1. The utility model provides a controllable rope connecting device of stretch-draw, its characterized in that, includes connecting plate, metal buckle, rope and bolt, the connecting plate pass through the rope hole install in the rope, the both ends of rope all are equipped with the annular cable, the diameter of annular cable is greater than the diameter of rope hole, the metal buckle install in annular cable, two the connecting plate is close to bolted connection is passed through to the one side of annular cable.

2. A tension controllable cable attachment as claimed in claim 1 wherein the cable comprises a steel wire rope or a shape memory alloy cable.

3. A tension controllable cable attachment as claimed in claim 1 wherein the metal clasp comprises an aluminium clasp or a steel clasp.

4. A tension controllable rope attachment as claimed in claim 1 wherein the number of bolts is greater than 1.

5. A design method of a tension-controllable rope connecting device is characterized by comprising the following steps:

s1, calculating the size and the number of the bolts according to the maximum stress of the rope;

s2, obtaining the length of a connecting plate and the width of the connecting plate according to the size of the bolts and the number of the bolts, then obtaining the minimum thickness of the connecting plate through calculation, and finally selecting a plate meeting the required size;

s3, drilling screw holes and rope holes in the plate according to the size of the bolts, the number of the bolts and the size of the rope to obtain the connecting plate;

s4, enabling the rope to penetrate through rope holes of the two connecting plates, manufacturing two ends of the rope into an annular rope, and finally installing a metal buckle on the annular rope by adopting a press machine;

s5, mounting the rope on a support, and connecting one surfaces of the two connecting plates, which are close to the annular rope, through the bolts;

and S6, adjusting the tightening distance of the nut through strain calculation so as to control the applied prestress of the rope.

6. A method of designing a tension controllable rope connection device as claimed in claim 5, wherein the rope in step S1 comprises a steel wire rope or a shape memory alloy rope.

7. A method of designing a tension controlled rope connection device as claimed in claim 5 wherein the number of bolts in step S1 is greater than 1.

8. A method of designing a tension controlled rope hitch as claimed in claim 5, wherein said metal clasp of step S4 comprises an aluminum clasp or a steel clasp.

Technical Field

The invention relates to the field of connection modes of civil engineering, in particular to a rope connection device with controllable tensioning and a design method.

Background

As a novel intelligent material, the Shape Memory Alloy (SMA) has the advantages of large strain, restorable deformation, additional energy consumption, fatigue resistance, good corrosion resistance and the like. The shape memory alloy member has good tensile properties, but poor shear and bending resistance. The shape memory alloy rods and plates may be joined by bolting. However, at present, no stable and reliable connecting method for the shape memory alloy wires and the shape memory alloy cables exists.

Easy to slip and the tension force is not controllable. The shape memory alloy cable has poor shearing resistance, and the cable volume is reduced under the extrusion condition, so the cable is easy to slip. The shape memory alloy wire always slips free as the tension in the wire increases to a certain value. This is due to the fact that the cross section of the shape memory alloy cable becomes smaller after the cable is tensioned and compacted. And the cable buckle connection method is easily influenced by tension force, so that the cable buckle connection method is not easy to stretch.

Disclosure of Invention

The invention aims to overcome the technical problem that a rope connecting part is easy to slide and fall off in the prior art, and provides a rope connecting device with controllable tensioning and a design method.

The purpose of the invention is realized by the following technical scheme: the utility model provides a controllable rope connecting device of stretch-draw, includes connecting plate, metal buckle, rope and bolt, the connecting plate pass through the rope hole install in the rope, the both ends of rope all are equipped with annular cable, the diameter of annular cable is greater than the diameter of rope hole, the metal buckle install in annular cable, two the connecting plate is close to bolted connection is passed through to the one side of annular cable.

Preferably, the rope comprises a steel wire rope or a shape memory alloy rope.

Preferably, the metal button comprises an aluminum button or a steel button.

More preferably, the number of bolts is greater than 1.

A design method of a tension-controllable rope connecting device comprises the following steps:

s1, calculating the size and the number of the bolts according to the maximum stress of the rope;

s2, obtaining the length of a connecting plate and the width of the connecting plate according to the size of the bolts and the number of the bolts, then obtaining the minimum thickness of the connecting plate through calculation, and finally selecting a plate meeting the required size;

s3, drilling screw holes and rope holes in the plate according to the size of the bolts, the number of the bolts and the size of the rope to obtain the connecting plate;

s4, enabling the rope to penetrate through rope holes of the two connecting plates, manufacturing two ends of the rope into an annular rope, and finally installing a metal buckle on the annular rope by adopting a press machine;

s5, mounting the rope on a support, and connecting one surfaces of the two connecting plates, which are close to the annular rope, through the bolts;

and S6, adjusting the tightening distance of the nut through strain calculation so as to control the applied prestress of the rope.

Preferably, the rope in step S1 includes a steel wire rope or a shape memory alloy rope.

More preferably, the number of bolts in the step S1 is greater than 1.

Preferably, the metal button in step S4 includes an aluminum button or a steel button.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. according to the invention, the annular shape memory alloy cable can be opened and closed at any time through the connecting plate, the metal buckle, the rope and the bolt, and the problem of insufficient operation space when the cable joint is pressed on site can be solved; the tension stress controllability is good, the pretensioning of the shape memory alloy cable is realized by tightening the nut, and the control effect is more accurate; the connection stability is good, the joint of the cable is pressed by a press machine, the stability and the reliability are good, and the shape memory alloy cable can not slide relatively at the connection point in the tensioning process.

Drawings

FIG. 1 is a schematic view of a tension controlled rope hitch of the present invention;

FIG. 2 is an elevation view of a tension controllable cord connection apparatus of the present invention;

FIG. 3 is a rear elevational view of a tension controllable cable attachment arrangement of the present invention;

FIG. 4 is a top plan view of a tension controlled rope hitch of the present invention;

FIG. 5 is a schematic view of a cable and attachment plate of a tension controlled cable attachment apparatus of the present invention;

FIG. 6 is a schematic view of the attachment plate (2 threaded holes) of a tension controlled rope attachment of the present invention;

FIG. 7 is a schematic view of the attachment plate (4 threaded holes) of a tension controlled rope attachment of the present invention;

reference numbers for parts in the drawings: 1. a connecting plate; 11. a screw hole; 12. a rope hole; 2. a rope; 21. a metal buckle; 22. a looped cable; 3. a screw; 4. a nut;

Detailed Description

The following describes the object of the present invention in further detail with reference to the drawings and specific examples, which are not repeated herein, but the embodiments of the present invention are not limited to the following examples.

Example one

As shown in fig. 1-5, a rope connection device with controllable tension comprises two connection plates 1, two metal buckles 21, a rope 2 and three bolts (including three screws 3 and three nuts 4), wherein the two connection plates 1 are provided with a rope hole 12 and three screw 3 holes, the three screw 3 holes are respectively arranged around the rope hole 12, the rope 2 passes through the rope holes 12 of the two connection plates 1, two ends of the rope 2 are folded to form an annular rope 22, the aluminum buckles are pressed on the annular rope 22 through a press, and the diameter of the annular rope 22 is larger than that of the rope hole 12 and is used for limiting the annular rope 22 to pass through the rope hole 12. After the rope 2 winds around the support for one circle, one surfaces of the two connecting plates 1 close to the annular rope 22 are connected through three bolts.

The connecting plate 1 is used for limiting and connecting two ends of the rope 2, the connecting plate 1 is made of Q235-grade steel plates, and the size of the connecting plate 1 can be calculated according to the number and size of bolts and the size of the rope 2; the metal buckle 21 is an aluminum buckle, and has the advantages of corrosion resistance and light weight; the annular cable 22 can achieve the function of preventing the rope 2 from sliding and separating in order to increase the diameter of the rope 2; the rope 2 is a steel wire rope, is low in price, is arranged on the support and plays a role in limiting tension; the number of the bolts is 3, and the bolts of different types can be selected and the number of the bolts can be increased or reduced according to the stress condition.

A design method of a tension-controllable rope connecting device comprises the following steps:

s1, calculating the size and the number of the bolts according to the maximum stress of the rope 2;

the calculation reference formula is:

in the formula sigma₁Maximum design stress for the rope 2; s₁Is the cross-sectional area of the rope 2; sigma₂For maximum design stress of the bolt, S₂Is the cross-sectional area of the bolt; and n is the number of bolts.

S2, determining the length of the connecting plate 1 and the width of the connecting plate 1 according to the number of the bolts and the sizes of the bolts, calculating the minimum thickness of the connecting plate 1 according to finite element software, and finally selecting a plate material with the size meeting the requirement;

s3, performing laser drilling on the plate according to the number of the bolts, the sizes of the bolts and the sizes of the ropes 2 to obtain a connecting plate 1 with a screw hole 11 and a rope hole 12;

s4, enabling the rope 2 to penetrate through the rope holes 12 of the two connecting plates 1, manufacturing the two ends of the rope 2 into an annular rope 22, and finally installing the metal buckle 21 on the annular rope 22 by adopting a press machine;

s5, mounting the rope 2 on the support in a circle, and connecting one surfaces of the two connecting plates 1, which are close to the annular rope 22, by bolts;

s6, adjusting the tightening distance of the nut 4 by the strain calculation to control the prestressing of the rope 2.

The calculation reference formula is:

where E is the modulus of elasticity of the selected cord 2, S is the distance by which the nut 4 is tightened, L_sLength of rope 2, σ_pIs the applied pre-stress.

Example two

Other technical features in the embodiment are the same as those in the first embodiment except for the following technical features:

the rope 2 in the embodiment adopts a shape memory alloy cable to replace a steel wire rope, and the shape memory alloy has super-strong recovery capability.

The metal button 21 in this embodiment adopts a steel button to replace an aluminum button, and the strength of the steel button is higher.

As shown in fig. 6, the number of the screw holes 11 on the connecting plate 1 in the present embodiment is two instead of three, and the shape is rectangular instead of triangular.

The formula of step S2 of the method for designing a tension-controllable rope 2 connection device in this embodiment isWherein sigma is the cross-sectional normal stress of the connecting plate 1; r is the radius of the screw 3; r is the radius of the rope 2; l is the length of the connecting plate 1; b is the width of the connecting plate 1; t is the thickness of the connecting plate 1; l is₂The distance between the screw hole 11 and the rope hole 12; s₂Is the cross-sectional area of the bolt.

EXAMPLE III

Other technical features in the embodiment are the same as those in the first embodiment except for the following technical features:

as shown in fig. 7, the number of the screw holes 11 of the connecting plate 1 in the present embodiment is four instead of three, and the shape is square instead of triangle.

The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions that do not depart from the technical spirit of the present invention are included in the scope of the present invention.