CN107956176B - A kind of preparation method of the rope of asymmetric display pulling force - Google Patents

Abstract

The invention relates to the technical field of ropes, in particular to a preparation method of a rope showing asymmetric tension. The preparation method of the rope includes selecting a rope main body, setting a covering layer outside the rope main body, selecting a reference line on the covering layer and setting a zero tension indicator line, fixing a transparent display layer outside the covering layer, and setting a transparent display layer on the display layer. Steps such as setting up multiple pulling force indicator lines. Compared with conventional ropes, the rope prepared by the method has the advantages of being able to display the magnitude of the pulling force, being convenient to produce, simple and reliable, and the like. Predetermined tension can be conveniently applied without carrying precision instruments during use, which saves manpower and material resources, and can also avoid loss of precision instruments for testing tension during construction.

Description

A kind of preparation method of the rope showing the tension force asymmetrically

technical field

The invention relates to the technical field of ropes, in particular to a preparation method of a rope showing asymmetric 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

Aiming at the above-mentioned technical problems in the prior art, the present invention provides an asymmetric tension display rope and its preparation method, which can directly display the magnitude of 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 object is: an asymmetric tension display rope, including a rope main body, a coating layer and a display layer; There is a display layer with a certain length outside; there is no relative displacement between the covering layer and the rope main body; a fixed baseline is set near the edge of one side in the length direction of the display layer, and the display layer and the covering layer are connected at the position of the fixed baseline. Fixed so that there is no overall relative displacement; there is no relative displacement between the covering layer and the rope main body, and the covering layer can have relative displacement with the display layer other than the fixed baseline; the fixed baseline is used as the guideline on the display layer , to the other edge direction in the length direction away from the fixed base line, the first tension display line, the second tension display line, the third tension display line, the fourth tension display line, and the fourth tension display line surrounding the display layer are arranged in sequence. The display line is the edge line of the other side edge far away from the fixed baseline in the length direction of the display layer; Zero-tension display line; the zero-tension display line is located between the fixed baseline and the first tension display line; the display layer is made of transparent material to facilitate the observation of the position of the tension display line.

Preferably, a transparent protective layer can be provided outside the display layer to protect the multiple tensile display lines from being worn off.

Preferably, the covering layer 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 is usually uneven, which is not conducive to the marking of the tension display line. Therefore, a covering layer (preferably made of rubber material) is arranged outside the rope main body, and the relative displacement between the rope main body and the rope main body is prevented, so as to facilitate the marking of the tension display line on the covering layer. Of course, if the surface of the rope main body can be conveniently provided with a tension display line, then the cladding layer can be omitted, and the display layer can be directly arranged outside the rope main body, and the structure of the rope for asymmetric tension display and the following determination of the tension display can be adjusted accordingly The corresponding descriptive term in the method of line position, but the essential method is unchanged.

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

Preferably, the fourth tension display line is a rope breaking strength display line, the third tension display line is an 80% rope fracture strength display line, the second tension display line is a 50% rope fracture strength display line, and the first tension display line is 20% % Rope breaking strength display line, zero tension display line is the display line when the tension is zero. That is to say, when the rope with asymmetric display tension is under the action of tension, when the zero tension display line is displaced in the length direction of the rope with the action of the tension and coincides with the first tension display line, it means the rope with asymmetric display tension The value of the tensile force to be sustained is the first tensile force. By analogy, when the zero tension display line is displaced in the length direction of the rope with the action of the tension and coincides with the second tension display line, it means that the tension on the rope that shows the asymmetric tension is the second tension; when When the zero tension display line shifts along the length of the rope with the action of the tension and coincides with the third tension display line, it means that the tension on the rope with asymmetric display tension is the third tension; when the zero tension display line follows the When the displacement occurs in the rope length direction due to the action of the pulling force and coincides with the fourth pulling force display line, it means that the pulling force on the rope showing the asymmetrical pulling force is the fourth pulling force.

Preferably, multiple tension display lines representing different tension levels can be selected according to actual needs. More preferably, the multiple tension display 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 display line on the display layer and the position of the zero tension display line on the cladding layer are 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 showing asymmetrical tension, and the main body of the rope is covered with the coating layer; cut it into 15-20 test ropes with 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 a display layer of a certain length, the distance between the fixed baseline and the fourth tension display line is L, the distance between the fourth tension display line and the zero tension display line is L ₄ , the third tension display line and the zero tension display line The distance between the second pull display line and the zero pull display line is L ₃ , the distance between the first pull display line and the zero pull display line is L _{1 ;} according to (LL ₄ )×(1+X ₄ ) =L, that is, in the rope with asymmetric display tension, the length of the area between the zero tension display line and the fixed baseline after being stretched under the action of the fourth tension should be equal to the distance L between the fixed baseline and the fourth tension display line , L ₄ =(LX ₄ /(1+X ₄ )); similarly, L ₃ =(LX ₃ /(1+X ₃ )); L ₂ =(LX ₂ /(1+X ₂ ) ), L ₁ =(LX ₁ /(1+X ₁ )).

Further, the fourth tension display line is selected as black, the third tension display line is selected as red, the second tension display line is selected as orange, the first tension display line is selected as yellow, and the zero tension display line is selected as blue. When the rope with asymmetric display tension is not stretched, the zero tension display line on the covering layer is located between the first tension display line and the fixed baseline; when the asymmetric display tension rope is in the stretched state, the yellow first When the tension display line coincides with the zero tension display line on the cladding layer, it means that the tension of the rope is the first tension F ₁ ; in the same way, when the rope with asymmetrical tension display is stretched, the orange second tension display line is in line with When the zero tension display line on the covering layer coincides, it means that the tension of the rope is the second tension F ₂ ; when the rope with asymmetrical display tension is stretched, the red third tension display line and the zero tension on the covering layer When the display lines coincide, it means that the tension of the rope is the third tension F ₃ . If the third pulling force is selected as the safe load pulling force value, and the fourth pulling force is the breaking strength of the rope, then when the rope showing the asymmetrical pulling force is in a stretched state, the zero pulling force display line on the cladding layer is located between the third pulling force display line and the When the fourth pulling force shows between the lines, it means that the rope is on the verge of breaking, and no greater pulling force can be applied to the rope.

Further, a method for preparing an asymmetric tension-displaying rope 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 select a certain length of transparent display layer at the same time, and set a fixed baseline near the edge of one side in the length direction of the display layer; The edge line on the other side of the fixed baseline is the fourth tension display line, and the distance between the fourth tension display line and the reference line is L;

3) Delineate the zero-tension display line on the cladding layer, and delineate the first tension display line, the second tension display line, and the third tension display line on the display layer in sequence;

4) Set the display layer outside the cladding layer so that the fixed baseline of the display layer coincides with the baseline on the cladding layer, and fix the display layer and the cladding layer at the position of the fixed baseline so that no overall relative displacement occurs , but the cladding layer can be displaced relative to the display layer other than the fixed baseline; thus, a rope with asymmetric display tension is obtained.

More preferably, a transparent protective layer can be provided outside the display layer to protect the multiple tensile display lines from being worn off.

Beneficial effects of the present invention:

The beneficial effects of the present invention are: the present invention provides an asymmetric tension display rope 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 this kind of asymmetric tension display rope as the cable of the wire pile, set the first tension as the required predetermined tension value, during construction work, apply tension to this asymmetric tension tension rope , when the first tension display line coincides with the zero tension display line on the cladding 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 display line, the third tension display line, etc. are set to facilitate the workers to select the predetermined tension to be applied according to actual needs. More preferably, a plurality of tension display lines are directly arranged in the form of a scale, so as to facilitate direct reading of the tension on the rope. The use of asymmetrical arrangement can also save the material of the display layer, further reduce the cost and shorten the length of the display layer, so as not to cause inconvenience.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the asymmetric tension-displaying rope of the present invention.

Reference signs:

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

Detailed ways

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

An asymmetric tension display rope, comprising a rope main body 1, a covering layer 2, and a display layer 3; it is characterized in that the main body 1 of the rope is covered with a covering layer 2, and the covering layer 2 is provided with a display of a certain length Layer 3; there is no relative displacement between the covering layer 2 and the rope main body 1; a fixed baseline F is set at the edge position near one side in the length direction of the display layer 3, and the display layer 3 and the covering layer are connected at the position of the fixed baseline F Layer 2 is fixed so that no overall relative displacement occurs; there is no relative displacement between the covering layer 2 and the rope main body 1, and the covering layer 2 can undergo relative displacement with the display layer 3 other than the fixed baseline F; in the display layer 3, with the fixed base line F as the alignment line, the first tension display line B, the second tension display line C, and the third tension display line surrounding the display layer 3 are sequentially arranged in the direction of the other side edge away from the fixed base line F in the length direction. The tension display line D, the fourth tension display line E, the fourth tension display line E is the edge line of the other side edge away from the fixed baseline in the length direction of the display layer 3; on the cladding layer, the fixed baseline is used as the guide line , a zero-tension display line A is provided toward the edge of the other side in the length direction away from the fixed baseline; the zero-tension display line A is located between the fixed baseline F and the first tension display line B; the display layer 3 is made of transparent material , so as to observe the position of the tension display line.

Preferably, the covering layer 2 is made of rubber. Since the steel wire rope is generally formed by twisting a plurality of steel wires together, the surface of the rope main body 1 is usually uneven, which is not conducive to the marking of the tension display 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 the marking of the tension display line on the coating layer 2 . Of course, if the surface of the rope main body 1 can be conveniently provided with a tension display line, then the cladding layer 2 can be omitted, and the display layer 3 can be directly arranged outside the rope main body 1, and the structure of the asymmetrical tension display rope and the lower surface can be adjusted accordingly. The corresponding descriptive terms in the above method of determining the position of the tension display line, but the essential method remains unchanged.

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

Preferably, the fourth tension display line E is a display line for rope breaking strength, the third tension display line D is a display line for 80% rope breaking strength, the second tension display line C is a display line for 50% rope breaking strength, and the first tension display line is Line B is the display line for 20% rope breaking strength, and zero tension display line A is the display line when the tension is zero. That is to say, under the tension of the rope showing the asymmetrical tension, when the zero tension display line A is displaced in the length direction of the rope with the action of the tension and coincides with the first tension display line B, it means the asymmetric display tension The value of the tension on the rope is the first tension. By analogy, when the zero tension display line A is displaced in the length direction of the rope with the action of the tension and coincides with the second tension display line C, it means that the tension on the rope with asymmetric display tension is the second tension ; When the zero tension display line A is displaced in the length direction of the rope and coincides with the third tension display line D along with the action of the tension, it means that the tension value on the rope with asymmetric display tension is the third tension; When the tension display line A is displaced along the length of the rope with the action of the tension and coincides with the fourth tension display line E, it means that the tension on the asymmetrical tension display rope bears the fourth tension.

Preferably, multiple tension display lines representing different tension levels can be selected according to actual needs. More preferably, the multiple tension display 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 display line on the display layer 3 and the position of the zero tension display line AA on the cladding layer 2 are determined by the following method, and the specific steps are as follows:

1) Select the rope main body 1 and the coating layer 2 for preparing a rope showing asymmetric tension, and the rope main body 1 is covered with the coating layer 2; cut it into 15-20 test ropes with 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 a display layer 3 of a certain length, the distance between the fixed baseline F and the fourth tension display line E is L/2, the distance between the fourth tension display line E and the zero tension display line A is L ₄ , the third tension The distance between the display line D and the zero-tension display line A is L ₃ , the distance between the second tension display line C and the zero-tension display line A is L ₂ , and the distance between the first tension display line B and the zero-tension display line A is L ₁ ;According to (LL ₄ )×(1+X ₄ )=L, that is, in the rope with asymmetric display tension, the length of the area between the zero tension display line A and the fixed baseline after being stretched under the action of the fourth tension should be It is equal to the distance L between the fixed baseline and the fourth tension display line. After calculation, L ₄ =(LX ₄ /(1+X ₄ )); similarly, L ₃ =(LX ₃ /(1+X ₃ )) ; L ₂ =(LX ₂ /(1+X ₂ )), L ₁ =(LX ₁ /(1+X ₁ )).

Further, the fourth tension display line E is selected as black, the third tension display line D is selected as red, the second tension display line C is selected as orange, the first tension display line B is selected as yellow, and the zero tension display line A is blue. When the asymmetric tension display rope is not stretched, the zero tension display line A on the covering layer 2 is located between the first tension display line B and the fixed baseline F; when the asymmetric tension display rope is in a stretched state When the yellow first tension display line B coincides with the zero tension display line A on the cladding layer 2, it means that the tension of the rope is the _first tension F1; similarly, when the rope with asymmetrical tension display is orange in the stretched state When the second tension display line C on the cover layer 2 coincides with the zero tension display line A on the coating layer 2, it means that the tension of the rope is the second tension F ₂ ; when the asymmetrical tension display rope is in the stretched state, the red third tension When the display line D coincides with the zero-tension display line A on the covering layer 2, it indicates that the tension of the rope is the third tension F ₃ . If the third pulling force is selected as the safe load pulling force value, and the fourth pulling force is the breaking strength of the rope, then when the rope with asymmetric display pulling force is in a stretched state, the zero pulling force display line A on the coating layer 2 is located at the third pulling force display When the line D is between the fourth tension display line E, it means that the rope is on the verge of breaking, and no greater tension can be applied to the rope.

Further, a method for preparing an asymmetric tension-displaying rope 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, and select a certain length of transparent display layer at the same time, and set a fixed baseline near the edge of one side in the length direction of the display layer; The edge line on the other side of the fixed baseline is the fourth tension display line, and the distance between the fourth tension display line and the reference line is L;

3) Delineate the zero tension display line A on the cladding layer 2, and delineate the first tension display line B, the second tension display line C, and the third tension display line D on the display layer 3 in sequence;

4) The display layer 3 is arranged outside the cladding layer 2, so that the fixed baseline F of the display layer 3 coincides with the reference line on the cladding layer 2, and the display layer 3 and the cladding layer 2 are fixed at the position of the fixed baseline F, The overall relative displacement does not occur, but the cladding layer 2 can undergo relative displacement with the display layer 3 other than the fixed base line F; thus, an asymmetrical tension display rope can be obtained.

More preferably, a transparent protective layer can be provided outside the display layer 3 to protect the multiple tensile display lines from being worn off.

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. a kind of preparation method of the rope of asymmetric display pulling force, includes 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 the transparent display layer of selected certain length, and in the length side of display layer One side edge position is provided with fixed base upwards；The other side of separate fixed base on the length direction of display layer The edge line at edge is that the 4th pulling force shows that line, the 4th pulling force show that line is L at a distance from reference line；

3) zero pulling force delimited on clad and shows line, and the first pulling force successively delimited on display layer and shows that line, the second pulling force are aobvious Timberline, third pulling force show line；

4) display layer is arranged outside clad, is overlapped the fixed base of display layer with the reference line on clad, and solid Determine baseline position to fix display layer and clad, makes it that whole relative displacement not occur, but clad can be with fixed base With the display layer of outer portion relative displacement occurs for line；The rope of asymmetric display pulling force is obtained therefrom；

Each pulling force shows that the position of line and zero pulling force on clad show the position of line by the following method on display layer It determines, the specific steps are as follows:

1. choosing the rope main body and clad for being used to prepare the rope of asymmetric display pulling force, rope main body is coated with cladding Layer；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 display layer of certain length, fixed base and the 4th pulling force show that the distance between line is L, and the 4th pulling force is shown Line shows to be L at a distance from line with zero pulling force₄, to show that line and zero pulling force are shown be L at a distance from line to third pulling force₃, the second pulling force shows Line shows to be L at a distance from line with zero pulling force₂, to show that line and zero pulling force are shown be L at a distance from line to the first pulling force₁；According to (L-L₄) × (1+X₄)=L, i.e., in the rope of asymmetric display pulling force, zero pulling force shows the region between line and fixed base in the 4th pulling force Under the action of stretch after length should be equal to fixed base and the 4th pulling force and show the distance between line L, obtain L through reckoning₄= (LX₄/(1+X₄));Similarly, L₃=(LX₃/(1+X₃)); L₂=(LX₂/(1+X₂)), L₁=(LX₁/(1+X₁))。

2. the preparation method of the rope of asymmetric display pulling force as claimed in claim 1, it is characterised in that: be arranged outside the display layer Transparent protective layer.

3. the preparation method of the rope of asymmetric display pulling force as claimed in claim 1, it is characterised in that: the clad uses rubber Glue is made.

4. the preparation method of the rope of asymmetric display pulling force as claimed in claim 1, it is characterised in that: the 4th pulling force is shown Line is black, and the third pulling force display line is red, and second pulling force shows that line is orange, the first pulling force display line For yellow, zero pulling force shows that line is blue.