CN107941403B - A preparation method of a rope capable of indicating tension - Google Patents

Abstract

The present invention relates to rope technique fields, and in particular to one kind can indicate the preparation method of the rope of pulling force.The preparation method of the rope includes selection rope main body, outside rope main body clad is arranged, and on clad selected reference line and a plurality of pulling force index line is arranged and fixes marker outside clad.The advantages that rope that this method is prepared has the size that can indicate pulling force compared with conventional rope, convenient for production, simple and reliable.Do not have to carrying precision instrument when use to be convenient to apply predetermined pull, saves manpower and material resources, while can also be to avoid the precision instrument for losing test pulling force in construction.

Description

A preparation method of a rope capable of indicating tension

technical field

The invention relates to the technical field of ropes, in particular to a preparation method of a rope capable of indicating tension.

Background technique

Rope is a commonly used item in daily life and project engineering. During the actual use of the rope, in some application fields, it is often necessary to apply a predetermined tension to the rope. For example, in textile mills, whether it is plant construction or the actual application of textile mills, there are many places where ropes need to be used. In some cases, it is necessary to apply a certain predetermined tension to the rope to keep the rope under tension. The predetermined tension sometimes needs to be applied according to the set value, and cannot be applied arbitrarily. Therefore, it is usually necessary to measure the pre-tension with precision instruments when a predetermined tension is applied to the rope. However, in some occasions, it is not convenient to use precision instruments, and precision instruments are relatively expensive, which virtually increases the cost of the enterprise. For another example, in rural areas, power transmission is often achieved through long-distance transmission by fixing wires on the top of wire piles at intervals. And in the installation process of electric wire pile, often need to set the drag cable with certain pulling force and pull electric wire pile to avoid electric wire pile to fall down. In this process, it is often necessary to use precision instruments to measure the tension of the cable to meet actual needs. However, these sophisticated instruments are often bulky or inconvenient to carry. For example, when a worker uses a rope to work, the working environment may be a hillside, high altitude, etc. When working in these places, if the equipment carried by the workers can be reduced as much as possible, the burden on the workers will be greatly reduced and energy will be saved. Therefore, when using a rope, how to apply a predetermined tension to the rope without carrying a tension detection device is a problem that has plagued workers for a long time.

Contents of the invention

In view of the above-mentioned technical problems in the prior art, the present invention provides a rope capable of indicating tension and a preparation method thereof, which can directly indicate the magnitude of the tension by observing the elongation of the rope during the process of applying tension to the rope.

The technical solution adopted by the present invention to achieve the above purpose is: a rope capable of indicating tension, including a rope main body, a covering layer and an indicating layer; An indicator layer with a certain length is set; no relative displacement occurs between the coating layer and the rope main body; a fixed baseline is set in the middle of the length direction of the indicator layer, and the indicator layer and the coating layer are fixed at the position of the fixed baseline, so that There is no overall relative displacement; there is no relative displacement between the coating layer and the rope main body, and the coating layer can have relative displacement with the indicator layer other than the fixed baseline; on the coating layer, the fixed baseline is the axis of symmetry, and the The fourth tension indicator line, the third tension indicator line, the second tension indicator line, the first tension indicator line and the zero tension indicator line are arranged symmetrically around the cladding layer; Edges are even.

Preferably, the indicating layer is made of transparent material, so as to facilitate the observation of the position of the tension indicating line.

Preferably, the covering layer is made of rubber. Because the steel wire rope is generally formed by twisting a plurality of steel wires by twisting, the surface of the rope main body is usually uneven, which is not conducive to the marking of the tension indicator line. Therefore, a coating layer (preferably made of rubber material) is provided outside the rope body, and the relative displacement between the rope body and the rope body does not occur, so as to facilitate the marking of the tension indicator line on the coating layer. Of course, if the surface of the rope body can be conveniently provided with a tension indicator line, then the covering layer can be omitted, and the indicator layer can be directly placed outside the rope body, and the structure of the rope that can indicate the tension and the following determination of the tension indicator line can be adjusted accordingly The corresponding descriptive term in the method of location, but the essential method is unchanged.

Preferably, the fourth tension indicator line, the third tension indicator line, the second tension indicator line, the first tension indicator line and the zero tension indicator line are of different colors, so as to visually distinguish the magnitude of the tension force; further preferably, the fourth tension indicator line The line is black, the third tension indicator line is red, the second tension indicator line is orange, the first tension indicator line is yellow, and the zero tension indicator line is blue.

Preferably, the fourth tension indicator line is a rope fracture strength indicator line, the third tension indicator line is an 80% rope fracture strength indicator line, the second tension indicator line is a 50% rope fracture strength indicator line, and the first tension indicator line is 20% of the rope fracture strength indicator line. % Rope breaking strength indicator line, zero tension indicator line is the indicator line when the tension is zero.

Preferably, multiple tension indicator lines representing different tension levels can be selected according to actual needs. More preferably, the multiple tension indicator lines are directly set in the form of a scale to facilitate direct reading of the tension on the rope.

The position of each tension indicator line on the cladding layer is determined by the following method, and the specific steps are as follows:

1) Select the rope main body and coating layer used to prepare the rope that can indicate the tension, and the main body of the rope is covered with the coating layer; cut it into 15-20 test ropes of different lengths;

2) Take 4 test ropes of the same length at each length, and use a universal material testing machine to perform a tensile test on the test rope at a set tensile speed until the test rope breaks; record the difference between the tensile load and the length of the test rope relationship curve and data;

3) Use mathematical analysis software to analyze and calculate the relationship curve and data between the tensile load and the length of the test rope obtained in step 2), obtain the tensile load-elongation curve of the test rope, and fit the tensile load-elongation curve. Mathematical formula of length-rate relationship;

4) Substitute the first tension F ₁ , the second tension F ₂ , the third tension F ₃ , and the fourth tension F ₄ of the test rope into the mathematical formula of the tensile load-elongation relationship obtained in step 3), and obtain Elongation X ₁ , X ₂ , X ₃ , X ₄ of the test rope corresponding to the tensile force;

5) Select an indicating layer with a length of L, the distance between the fixed baseline and the zero tension indicator line is L/2, the distance between the fourth tension indicator line and the zero tension indicator line is L ₄ , the third tension indicator line and the zero tension indicator line The distance between the indicator line is L ₃ , the distance between the second tension indicator line and the zero tension indicator line is L ₂ , the distance between the first tension indicator line and the zero tension indicator line is L ₁ ; according to (L/2-L ₄ )× (1+X ₄ )=L/2, in the rope that can indicate the tension, the length of the area between the fourth tension indicator line and the fixed base line after being stretched under the action of the fourth tension force should be equal to half the length of the indicator layer , L ₄ =(LX ₄ /(2+2X ₄ )); Similarly, L ₃ =(LX ₃ /(2+2X ₃ )); L ₂ =(LX ₂ /(2+2X ₂ ) ), L ₁ =(LX ₁ /(2+2X ₁ )).

Further, the fourth tension indicator line is selected as black, the third tension indicator line is selected as red, the second tension indicator line is selected as orange, the first tension indicator line is selected as yellow, and the zero tension indicator line is selected as blue. When the tension-indicating rope is not stretched, the zero-tension indicator line is flush with the edge line of the indicating layer; when the tension-indicating rope is stretched, the yellow first tension indicator line is level with the edge line of the indicating layer When it is aligned, it means that the pulling force of the rope is the _first pulling force F1; similarly, when the orange second pulling force indicating line is flush with the edge line of the indicating layer under the stretched state of the rope that can indicate the pulling force, it means that the pulling force of the rope is Second pulling force F ₂ ; when the red third pulling force indicating line is flush with the edge line of the indicating layer in the stretched state of the rope that can indicate the pulling force, it means that the pulling force of the rope is the third pulling force F ₃ . If the third tension is selected as the safe load tension value, and the fourth tension is the breaking strength of the rope, then when the rope that can indicate the tension is in a stretched state, the edge line of the indicating layer is located between the third tension indicator line and the fourth tension indicator line. Between , it means that the rope is on the verge of breaking and no more tension can be applied to the rope.

Further, a method for preparing a rope capable of indicating tension is provided, comprising the following steps:

1) Select the main body of the rope, and set a coating layer outside the main body of the rope, so that there will be no relative displacement between the coating layer and the main body of the rope;

2) Select the reference line on the cladding layer, and at the same time select the indicator layer with a length L, and determine the fixed baseline at the middle position in the length direction of the indicator layer; the distance from the reference line in the length direction of the cladding layer Draw a zero tension indicator line for L/2;

3) Between the zero tension indicator line and the reference line, delineate the first tension indicator line, the second tension indicator line, the third tension indicator line and the fourth tension indicator line in sequence;

4) Set the indicator layer outside the cladding layer so that the fixed baseline of the indicator layer coincides with the baseline on the cladding layer, and fix the indicator layer and the cladding layer at the position of the fixed baseline so that the overall relative displacement does not occur , but the covering layer can be displaced relative to the indicating layer other than the fixed baseline; the edge lines at both ends of the indicating layer in the length direction are flush with the zero-tension indicating line, thereby obtaining a rope that can indicate tension.

Beneficial effects of the present invention:

The beneficial effects of the invention are: the invention provides a rope capable of indicating tension and a preparation method thereof. This enables a predetermined tension to be applied to the rope during rope stretching without the use of a tensile testing apparatus. Simple and reliable, it reduces the need for workers to carry precision tensile testers and other equipment during operation, saving physical strength. For example, when using the rope that can indicate the pulling force as the cable of the electric pile, set the first pulling force as the required predetermined pulling force value, during construction work, apply the pulling force to the rope that can indicate the pulling force, when When the first tension indicator line is flush with the edge line of the indicator layer, it can be determined that the tension applied to the cable is a predetermined tension value. This greatly facilitates the construction work of the workers, and there is no need to carry a precise tensile tester, and there is no need to worry about losing the tensile tester during construction on the construction site to avoid property loss. In the same way, the second tension indicator line, the third tension indicator line, etc. are set to facilitate the workers to select the predetermined tension to be applied according to actual needs. More preferably, the plurality of tension indicator lines are directly arranged in the form of a scale, so as to facilitate direct reading of the tension on the rope.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the rope capable of indicating tension according to the present invention.

Reference signs:

1. Rope main body; 2. Covering layer; 3. Indicating layer; A. Zero tension indicator line; B. First tension indicator line; C. Second tension indicator line; D. Third tension indicator line; E. Four tension indicator lines; F, fixed baseline.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

A rope capable of indicating tension, which includes a rope main body 1, a covering layer 2, and an indicating layer 3; it is characterized in that: the main body 1 of the rope is covered with a covering layer, and the covering layer is provided with an indicating layer 3 of a certain length There is no relative displacement between the covering layer and the rope main body 1; a fixed base line F is arranged at the middle position of the indicating layer 3 in the length direction, and the indicating layer 3 and the covering layer 2 are fixed at the position of the fixed base line F, so that There is no overall relative displacement; there is no relative displacement between the coating layer 2 and the rope main body 1, and the coating layer 2 can be relative to the indicator layer other than the fixed baseline F; on the coating layer 2, the fixed baseline F It is an axis of symmetry, and the fourth tension indicator line E, the third tension indicator line D, the second tension indicator line C, the first tension indicator line B and the zero tension indicator line A are arranged symmetrically around the cladding layer 2 in sequence; The indicating line A is flush with the edge lines indicating both ends of the lengthwise direction of the layer 3 .

Preferably, the indicating layer is made of transparent material, so as to facilitate the observation of the position of the tension indicating line.

Preferably, the covering layer 2 is made of rubber. Because the steel wire rope is generally formed by twisting multiple steel wires together, the surface of the rope main body 1 is usually uneven, which is not conducive to the marking of the tension indicator line. Therefore, a coating layer 2 (preferably made of rubber material) is provided on the outside of the rope main body 1 , and the relative displacement between the rope main body 1 and the rope main body 1 does not occur, so as to facilitate marking of the tension indicator line on the coating layer 2 . Of course, if the surface of the rope main body 1 can be conveniently provided with a tension indicating line, the coating layer 2 can be omitted, and the indicating layer 3 can be directly arranged outside the rope main body 1, and the structure of the rope capable of indicating the tension can be adjusted accordingly and the following The corresponding descriptive term in the method of determining the position of the tension indicator line, but the essential method is unchanged.

Preferably, the fourth tension indicator line E, the third tension indicator line D, the second tension indicator line C, the first tension indicator line B and the zero tension indicator line A are of different colors, so as to visually distinguish the tension; further preferably , the fourth tension indicator line E is black, the third tension indicator line D is red, the second tension indicator line C is orange, the first tension indicator line B is yellow, and the zero tension indicator line A is blue.

Preferably, the fourth tension indicator line E is a rope fracture strength indicator line, the third tension indicator line D is an 80% rope fracture strength indicator line, the second tension indicator line C is a 50% rope fracture strength indicator line, and the first tension indicator line Line B is the 20% rope breaking strength indicator line, and zero tension indicator line A is the indicator line when the tension is zero.

Preferably, multiple tension indicator lines representing different tension levels can be selected according to actual needs. More preferably, the multiple tension indicator lines are directly set in the form of a scale to facilitate direct reading of the tension on the rope.

The position of each tension indicator line on the cladding layer is determined by the following method, and the specific steps are as follows:

1) Select the rope main body 1 and the coating layer 2 used to prepare the rope that can indicate the tension, and the rope main body 1 is covered with the coating layer 2; cut it into 15-20 test ropes of different lengths;

2) Take 4 test ropes of the same length at each length, and use a universal material testing machine to perform a tensile test on the test rope at a set tensile speed until the test rope breaks; record the difference between the tensile load and the length of the test rope relationship curve and data;

3) Use mathematical analysis software to analyze and calculate the relationship curve and data between the tensile load and the length of the test rope obtained in step 2), obtain the tensile load-elongation curve of the test rope, and fit the tensile load-elongation curve. Mathematical formula of length-rate relationship;

4) Substitute the first tension F ₁ , the second tension F ₂ , the third tension F ₃ , and the fourth tension F ₄ of the test rope into the mathematical formula of the tensile load-elongation relationship obtained in step 3), and obtain Elongation X ₁ , X ₂ , X ₃ , X ₄ of the test rope corresponding to the tensile force;

5) Select an indication layer with a length of L, the distance between the fixed baseline F and the zero-tension indication line A is L/2, the distance between the fourth tension indication line E and the zero-tension indication line A is L ₄ , and the third tension indication The distance between the line D and the zero tension indicator line A is L ₃ , the distance between the second tension indicator line C and the zero tension indicator line A is L ₂ , and the distance between the first tension indicator line B and the zero tension indicator line A is L ₁ ; According to (L/2-L ₄ )×(1+X ₄ )=L/2, in the rope that can indicate the pulling force, the area between the fourth pulling force indicating line E and the fixed baseline F is under the action of the fourth pulling force The length after stretching should be equal to half of the length of the indicator layer. After calculation, L ₄ =(LX ₄ /(2+2X ₄ )); similarly, L ₃ =(LX ₃ /(2+2X ₃ )); L ₂ =(LX ₂ /(2+2X ₂ )), L ₁ =(LX ₁ /(2+2X ₁ )).

Further, the fourth tension indicator line E is selected as black, the third tension indicator line D is selected as red, the second tension indicator line C is selected as orange, the first tension indicator line B is selected as yellow, and the zero tension indicator line A is blue. When the rope that can indicate the tension is not stretched, the zero tension indicator line A is flush with the edge line of the indicator layer; when the rope that can indicate the tension is stretched, the yellow first tension indicator line B is aligned with the edge of the indicator layer When the lines are flush, it means that the pulling force of the rope is the _first pulling force F1; similarly, when the orange second pulling force indicating line C of the rope that can indicate the pulling force is in a stretched state and is flush with the edge line of the indicating layer, it means that the rope is The pulling force of the rope is the second pulling force F ₂ ; when the red third pulling force indicating line D is flush with the edge line of the indicating layer in the stretched state of the rope that can indicate the pulling force, it means that the pulling force of the rope is the third pulling force F ₃ . If the third tension is selected as the safe load tension value, and the fourth tension is the breaking strength of the rope, then when the rope that can indicate the tension is in a stretched state, the edge line of the indicating layer is located between the third tension indicating line D and the fourth tension indicating line D. Between the lines E, it means that the rope is on the verge of breaking and no more pulling force can be applied to the rope.

Further, a method for preparing a rope capable of indicating tension is provided, comprising the following steps:

1) Select the rope main body 1, and set the coating layer 2 outside the rope main body 1, so that there will be no relative displacement between the coating layer 2 and the rope main body 1;

2) Select the reference line on the cladding layer 2, and select the indicator layer with a length L at the same time, and determine the fixed baseline F at the middle position in the length direction of the indicator layer; The distance between the lines is L/2 to delineate the zero tension indicator line A;

3) Between the zero tension indicator line A and the reference line, delineate the first tension indicator line B, the second tension indicator line C, the third tension indicator line D and the fourth tension indicator line E;

4) Set the indicator layer outside the cladding layer 2, make the fixed baseline F of the indicator layer coincide with the reference line on the cladding layer 2, and fix the indicator layer and the cladding layer 2 at the position of the fixed baseline F so that it does not The overall relative displacement occurs, but the cladding layer 2 can be relative to the indicator layer other than the fixed baseline F; the edge lines at both ends of the indicator layer in the length direction are flush with the zero tension indicator line A, thus obtaining Indicates the tension of the rope.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand , the technical solution of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.

Claims (4)

1. one kind can indicate the preparation method of the rope of pulling force, include the following steps:

1) rope main body is selected, clad is set outside rope main body, makes to occur between clad and rope main body opposite Displacement；

2) the selected reference line on clad, while designated length is the marker of L, and on the length direction of determining marker The fixed base in middle position；It is indicated on the length direction of clad apart from the distance of reference line to delimit zero pulling force at L/2 Line；

3) between zero pulling force index line and reference line, the first pulling force index line, the second pulling force index line, third successively delimited and drawn Power index line and the 4th pulling force index line；

4) marker is arranged outside clad, is overlapped the fixed base of marker with the reference line on clad, and solid Determine baseline position to fix marker and clad, makes it that whole relative displacement not occur, but clad can be with fixed base With the marker of outer portion relative displacement occurs for line；The edge line at the both ends on the length direction of marker and zero pulling force index line Concordantly, obtain to indicate the rope of pulling force therefrom；

The position of each pulling force index line determines by the following method on clad, the specific steps are as follows:

1. choosing the rope main body and clad for being used to prepare the rope that can indicate pulling force, rope main body is coated with clad； Intercepted into the different test rope of 15-20 segment length；

2. taking the test rope of 4 equal lengths under each length, test rope is stretched in setting using universal testing machine Extension test is carried out under speed, until testing fracture of rope；It records tensile load and tests the relation curve and data of rope length degree；

3. being carried out using relation curve and data of the mathematical analysis software to 2. tensile load and test rope length degree that step obtains Analytical calculation obtains tensile load-extension curve of test rope, and it is public to fit tensile load-elongation relationship mathematics Formula；

4. by the first pulling force F of test rope₁, the second pulling force F₂, third pulling force F₃, the 4th pulling force F₄Substitute into what 3. step obtained respectively In tensile load-elongation relationship mathematical formulae, the elongation X of the test rope of corresponding pulling force is obtained₁、X₂、X₃、X₄；

5. choosing the marker that length is L, the distance between fixed base and zero pulling force index line are L/2, the instruction of the 4th pulling force Line is L at a distance from zero pulling force index line₄, third pulling force index line at a distance from zero pulling force index line be L₃, the second pulling force instruction Line is L at a distance from zero pulling force index line₂, the first pulling force index line at a distance from zero pulling force index line be L₁；According to (L/2-L₄) × (1+X₄)=L/2 can indicate in the rope of pulling force that the region between the 4th pulling force index line and fixed base is drawn the 4th Length after stretching under the action of power should be equal to the half of marker length, obtain L through calculating₄=(LX₄/(2+2X₄));Similarly, L₃=(LX₃/(2+2X₃)); L₂=(LX₂/(2+2X₂)), L₁=(LX₁/(2+2X₁))。

2. can indicate the preparation method of the rope of pulling force as claimed in claim 1, it is characterised in that: marker uses transparent material system At.

3. can indicate the preparation method of the rope of pulling force as claimed in claim 1, it is characterised in that: clad is made of rubber.

4. can indicate the preparation method of the rope of pulling force as claimed in claim 1, it is characterised in that: the 4th pulling force index line is black Color, third pulling force index line be red, the second pulling force index line be it is orange, the first pulling force index line be yellow, zero pulling force instruction Line is blue.