CN106896017B - Method for preventing alloy liquid from leaking in preparation process of steel wire rope sample and method for testing breaking tension of steel wire rope - Google Patents
Method for preventing alloy liquid from leaking in preparation process of steel wire rope sample and method for testing breaking tension of steel wire rope Download PDFInfo
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- CN106896017B CN106896017B CN201710192130.3A CN201710192130A CN106896017B CN 106896017 B CN106896017 B CN 106896017B CN 201710192130 A CN201710192130 A CN 201710192130A CN 106896017 B CN106896017 B CN 106896017B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
Abstract
A method for preventing alloy liquid from leaking in a steel wire rope sample preparation process and a method for testing the breaking force of a steel wire rope relate to the technical field of steel wire rope performance detection. A method for preventing alloy liquid from leaking in a preparation process of a steel wire rope sample comprises the following steps: and filling a leakage preventing agent into the vicinity of the binding part of the steel wire rope before pouring the alloy liquid, wherein the melting point of the leakage preventing agent is higher than that of the alloy liquid, and the leakage preventing agent is granular. Can prevent the alloy liquid leakage in the preparation process of the steel wire rope sample. A test method for breaking tension of a steel wire rope comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample. The test result is more accurate.
Description
Technical Field
The invention relates to the technical field of steel wire rope performance detection, in particular to a method for preventing alloy liquid from leaking in a steel wire rope sample preparation process and a method for testing breaking tension of a steel wire rope.
Background
The alloy casting method is the most commonly adopted method for carrying out the whole rope breaking tensile test of the steel wire rope, and is a method for carrying out the tensile test on a tensile testing machine after the ends of a test sample are bundled and then the ends are scattered and cleaned, and then the test sample is cast by using the molten alloy with low melting point and cooled to room temperature. The Chinese patent with the application number of 201210091982.0 provides a method for detecting the breaking force of the whole steel wire rope, belongs to one alloy casting method, and better solves the problems of detecting the breaking force of the whole steel wire rope and preparing a steel wire rope sample. However, in the actual use process, due to the special structure of the steel wire rope, a certain gap exists between strands, even if the clamping element arranged at the bottom of the mold is in full contact with the steel wire rope, the existence of the gap cannot be avoided, and therefore molten liquid is easy to leak out of the gap during casting, further alloy liquid leakage is caused, and safety production is seriously influenced.
Disclosure of Invention
The invention aims to provide a method for preventing alloy liquid from leaking in the preparation process of a steel wire rope sample, which can prevent the alloy liquid from leaking in the preparation process of the steel wire rope sample by adding a leakage-proof agent near a binding part of a steel wire rope.
The invention also aims to provide a method for testing the breaking force of the steel wire rope, the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample is used for testing the breaking force, and the test result is more accurate.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a method for preventing alloy liquid from leaking in a preparation process of a steel wire rope sample, which comprises the following steps: and filling a leakage preventing agent into the vicinity of the binding part of the steel wire rope before pouring the alloy liquid, wherein the melting point of the leakage preventing agent is higher than that of the alloy liquid, and the leakage preventing agent is granular.
The invention also provides a test method of the breaking tension of the steel wire rope, which comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample.
The embodiment of the invention has the beneficial effects that: a method for preventing alloy liquid from leaking in the process of preparing a steel wire rope sample is characterized in that a leakage-proof agent is filled near a binding part of a steel wire rope, the melting point of the leakage-proof agent is higher than that of the alloy liquid, the leakage-proof agent cannot react with low-melting-point alloy liquid such as bismuth, antimony, tin, zinc and the like, the leakage-proof agent is granular and can fill gaps among steel wires, leakage of the alloy liquid is prevented, and breaking tension test of the steel wire rope is not influenced.
A test method for breaking tension of a steel wire rope comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample. When the method for preventing the alloy liquid from leaking is used for preparing samples, the alloy liquid does not leak to a tension testing part or the ground, and the temperature of the alloy liquid is relatively uniform; if the traditional method is used, after the alloy liquid is injected into the die, the alloy liquid at the bottom of the die leaks, because the alloy liquid is continuously injected, after the alloy liquid is contacted with the steel wire rope, the temperature drops quickly, the alloy liquid injected first can be continuously injected after the injected alloy liquid is solidified to block a gap, the temperature of the alloy liquid in the die is not uniform, the whole casting head is not completely fused, the casting quality is influenced, the casting head is cracked, and the like, and the test result is further influenced. Therefore, the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking can be used for testing the breaking tension of the steel wire rope, and the accuracy of the test result can be ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a steel wire rope according to an embodiment of the present invention;
fig. 2 is a matching diagram of a steel wire rope and a mold according to an embodiment of the present invention.
Icon: 100-a mold; 200-a mold holder; 300-a steel wire rope; 310-a binding section; 320-tensile test section; 330-casting.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The alloy casting method is the most commonly used method for performing a steel wire rope breaking tensile test, and is a method for performing a tensile test on a tensile testing machine after the two ends of a steel wire rope 300 to be tested are bundled, the end parts of the steel wire rope 300 are scattered and cleaned, the steel wire rope is cast by using a low-melting-point molten alloy, and the steel wire rope is cooled to room temperature.
As shown in fig. 1, the bundled portion 310 of the wire rope 300 has a tensile force testing portion 320 and a pouring portion 330 on opposite sides thereof, and the pouring portion 330 is located at an end portion of the wire rope 300 and is in a dispersed state.
The method for preventing alloy liquid leakage and the method for testing breaking force of a steel wire rope in the preparation process of the steel wire rope sample according to the embodiment of the invention are specifically described below.
A method for preventing alloy liquid from leaking in the preparation process of a steel wire rope sample comprises the step of filling a leak preventer with a granular shape, wherein the melting point of the leak preventer is higher than that of the alloy liquid, and the leak preventer is filled near a binding part 310 of a steel wire rope 300.
Because gaps exist among the strands of the steel wire rope 300 and the leak preventive is granular, the leak preventive is filled near the binding part 310 of the steel wire rope 300 and can be filled in the gaps among the steel wires; moreover, the components with the melting points higher than the melting point of the alloy liquid in the leak preventive do not react with the alloy liquid with low melting point such as bismuth, antimony, tin, zinc and the like, so that the leakage of the alloy liquid is prevented, and the breaking tension test of the steel wire rope 300 is not influenced. Further, the leakage preventing agent includes an alkali metal halide such as sodium chloride, potassium chloride, lithium chloride, sodium fluoride, potassium fluoride, lithium fluoride, sodium bromide, potassium bromide, lithium bromide, etc., and in the embodiment of the present invention, sodium chloride is preferable. Sodium chloride can be edible salt or industrial salt. When the temperature of the low-melting-point alloy liquid is high to some extent, sodium chloride will melt due to the high temperature, and therefore, preferably, the leakage preventive agent further includes an alkaline earth metal halide such as calcium fluoride, magnesium fluoride, sodium chloride, magnesium chloride, calcium bromide, magnesium bromide. In embodiments of the present invention, calcium fluoride is preferred. Calcium fluoride and sodium chloride stir evenly before using, and calcium fluoride can not only fill the clearance of wire rope 300, and its melting point is 1402 ℃, and the temperature of low melting point alloy liquid generally can not reach such high temperature, and calcium fluoride can not take place to melt, and the effect that prevents the alloy liquid and reveal can be better. When calcium fluoride and sodium chloride are used as the leakage preventive, calcium fluoride may float, and therefore, it is preferable to prevent calcium fluoride from floating by using calcium fluoride and sodium chloride which are uniformly mixed. In order to better achieve the effect of preventing the leakage of the alloy liquid, the alkali metal halide is preferably 20 to 60 weight percent of the leakage preventer; further preferably, the alkaline earth metal halide is 40 wt% to 80 wt% of the leakage preventive. Still more preferably, the alkali metal halide is 40 wt% to 50 wt% of the leakage preventive. The proportion range is a preferable value obtained by combining self experience and creative work of the inventor, and when the leak preventive is a mixture of alkali metal halide and alkaline earth metal halide, the proportion range is selected to better realize the leakage of the alloy liquid. Furthermore, when sodium chloride or a mixture of sodium chloride and calcium fluoride is selected as the leak preventive, the leak preventive can be specifically selected according to the selected alloy liquid and the temperature finally reached by the alloy liquid.
Furthermore, the opposite sides of the binding portion 310 of the wire rope 300 are a tension test portion 320 and a pouring portion 330, respectively, the pouring portion 330 is located at the end of the wire rope 300 and is in a dispersed state, and the anti-leakage agent is filled in the binding portion 310 on the side close to the pouring portion 330. In a concrete operation, the wire rope 300 is bundled at the portions near both ends, and then both ends are opened from the bundling part 310 to be dispersed, and the tension test part 320 and the pouring part 330 are respectively provided at the opposite sides of the bundling part 310. The leakage preventive agent is filled in the side of the binding part 310 close to the pouring part 330, and the leakage preventive agent is better in preventing the alloy liquid from leaking as the filling position of the leakage preventive agent is closer to the binding part 310. The casting part 330 is cleaned before filling the leakage preventive. The scattered pouring part 330 is sufficiently cleaned to ensure that the steel wires from the bundling part 310 to the end of the steel wire rope 300 are free from grease and foreign matters. So as to avoid influencing the effect of the alloy liquid injection. Cleaning typically uses detergents such as: by soaking in kerosene and then washing with water. In other embodiments, the sprue 330 may not be cleaned.
Further, in the preferred embodiment of the present invention, in order to conveniently pour the alloy, a mold 100 is used, as shown in fig. 2, the mold 100 is provided with an inner cavity, and the bottom of the mold 100 is provided with a through hole. Before filling the leak preventive, the pouring portion 330 of the wire rope 300 is placed in the cavity of the mold 100. The bottom of the mold 100 is provided with a through hole which is communicated with the inner cavity and has a diameter matched with the outer diameter of the steel wire rope 300, the bundling part 310 is positioned at the through hole, and then the anti-leakage agent is filled in the through hole; the positions where the leakage preventive is filled include a side of the banding part 310 near the casting part 330, and a gap between the outer wall of the wire rope 300 and the wall forming the through-hole.
Detailed structure of the mold 100 referring to fig. 2, the mold 100 is provided with an inner cavity, the bottom of the mold 100 is provided with a through hole capable of contacting with the outer circumferential surface of a wire rope 300 placed in the axial direction of the inner cavity, and the mold 100 is detachably provided on a mold support 200. The die holder 200 has a space located below the through hole of the die 100, and the space has a height that enables the wire rope 300 placed in the axial direction of the cavity to be not bent. This space enables the wire rope 300 to be kept in a sagging state without bending when being poured.
In a specific operation, the wire rope 300 is passed through the through-hole of the mold 100 such that the pouring part 330 of the wire rope 300 is located in the inner cavity of the mold 100, the through-hole of the mold 100 is filled with the banding part 310, and then the leakage preventing agent is filled in a side of the banding part 310 adjacent to the pouring part 330 and a gap between the outer wall of the wire rope 300 and the wall forming the through-hole. The leakage preventive seals gaps between the outer wall of the wire rope 300 and the wall forming the through-hole and gaps between the wires. Then, the alloy liquid is injected into the mold 100. The molten alloy to be poured is usually a low-melting-point molten alloy, such as bismuth, antimony, tin, or zinc.
Further, after the leakage preventive is filled, an alloy liquid is injected into the mold 100, and the edge of the mold 100 is vibrated. In the embodiment of the invention, the vibration of the die 100 is mainly realized by knocking the edge of the die 100, and the knocking of the edge of the die 100 is to prevent the steel wire ropes 300 scattered in the die 100 from being mutually contacted and wound, to make the alloy liquid uniformly distributed, and to avoid holes from being formed when the alloy liquid is injected, so that the metal wire ropes cannot be used for the breaking tension test of the steel wire ropes 300. After the alloy liquid is injected, the mold 100 is knocked at short intervals, which may cause the alloy liquid to penetrate through the anti-leakage layer and cause the alloy liquid to leak, therefore, preferably, the alloy liquid is kept for at least 12 seconds after the injection is completed, the temperature of the alloy liquid is transmitted, and then the solidification tendency is generated, so that the alloy liquid is prevented from penetrating through the anti-leakage layer, and the leakage of the alloy liquid is prevented.
Further, after the alloy liquid in the inner cavity of the mold 100 is completely solidified, the alloy liquid is kept for more than 2 minutes, and then the steel wire rope 300 is taken out from the mold 100. If the alloy liquid in the mold 100 is taken out without being completely solidified, a certain safety hazard is caused.
The invention also provides a test method of the breaking force of the steel wire rope, which comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample.
If the traditional method is used for sample preparation, the step of preventing the alloy liquid from leaking is omitted, the alloy liquid at the bottom of the die 100 leaks after the alloy liquid is injected into the die 100, and because the alloy liquid is continuously injected, the temperature drops quickly after the alloy liquid is contacted with the steel wire rope 300, the alloy liquid can be continuously injected after the injected alloy liquid is solidified to block a gap, so that the temperature of the alloy liquid in the die 100 is uneven, the whole casting head is not completely fused, the casting quality is influenced, the casting head is possibly cracked, and the test result is further influenced. Therefore, the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking can be used for testing the breaking tension of the steel wire rope 300, and the accuracy of the test result can be ensured.
Further, the test of the breaking tension was performed on a testing machine having a clamp with a clamping length H and a distance H between the bundling part 310 and the end of the wire rope sample at the same end1The height of the filling of the leak preventive is H2Preferably, H2≤8mm，h＝H1-H2. The advantage of setting up like this is, can guarantee that tensile test portion 320 of wire rope 300 is the region that does not have leak protection agent or alloy liquid, has guaranteed not influenced by other factors to the test of the breaking tension of wire rope 300, and the test result is more accurate, accurate. Preferably, the distance between the end of the wire rope sample at the same end and the binder 310 is equal to the clamping length.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
A method for preventing alloy liquid from leaking in a preparation process of a steel wire rope sample is characterized in that a steel wire rope 300 is bundled at positions close to two end parts, a bundling part 310 divides the steel wire rope 300 into a pouring part 330 and a tension testing part 320, and the pouring part 330 is positioned at the end part of the steel wire rope 300. Then, the pouring part 330 is opened to be dispersed, and then the dispersed pouring part 330 is sufficiently cleaned, so that the steel wires from the bundling part 310 to the end of the steel wire rope 300 are free from grease and foreign matters. The wire rope 300 is then passed through the through-hole of the mold 100 so that the pouring part 330, one end of which has been subjected to a cleaning process, of the wire rope 300 is located in the inner cavity of the mold 100, and the through-hole of the mold 100 is filled with the bundling part 310. And then filling a leakage preventing agent, which is sodium chloride particles, into the side of the bundling part 310 close to the pouring part 330 and a gap between the outer wall of the wire rope 300 and the wall forming the through hole. And then injecting alloy liquid containing bismuth into the die 100, keeping for 15s, knocking the edge of the die 100, keeping for 2 minutes after the alloy liquid in the inner cavity of the die 100 is completely solidified, and taking out the steel wire rope 300 from the die 100. The same procedure is used for preventing the alloy liquid from leaking from the other end of the wire rope 300.
A test method for breaking tension of a steel wire rope comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample.
Example 2
A method for preventing alloy liquid from leaking in a preparation process of a steel wire rope sample is characterized in that a steel wire rope 300 is bundled at positions close to two end parts, a bundling part 310 divides the steel wire rope 300 into a pouring part 330 and a tension testing part 320, and the pouring part 330 is positioned at the end part of the steel wire rope 300. Then, the pouring part 330 is opened to be dispersed, and then the dispersed pouring part 330 is sufficiently cleaned, so that the steel wires from the bundling part 310 to the end of the steel wire rope 300 are free from grease and foreign matters. The wire rope 300 is then passed through the through-hole of the mold 100 so that the pouring part 330, one end of which has been subjected to a cleaning process, of the wire rope 300 is located in the inner cavity of the mold 100, and the through-hole of the mold 100 is filled with the bundling part 310. And then filling leak-proof agents into the side, close to the pouring part 330, of the bundling part 310 and gaps between the outer wall of the steel wire rope 300 and the wall forming the through hole, wherein the leak-proof agents are sodium chloride particles and calcium fluoride particles which are uniformly mixed, and the mass ratio of the sodium chloride to the calcium fluoride is 1: 1. And then injecting alloy liquid containing bismuth into the die 100, keeping for 12s, knocking the edge of the die 100, keeping for 3 minutes after the alloy liquid in the inner cavity of the die 100 is completely solidified, and taking out the steel wire rope 300 from the die 100. The same procedure is used for preventing the alloy liquid from leaking from the other end of the wire rope 300.
A test method for breaking tension of a steel wire rope comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample.
Example 3
A method for preventing alloy liquid from leaking in a preparation process of a steel wire rope sample is characterized in that a steel wire rope 300 is bundled at positions close to two end parts, a bundling part 310 divides the steel wire rope 300 into a pouring part 330 and a tension testing part 320, and the pouring part 330 is positioned at the end part of the steel wire rope 300. Then, the pouring part 330 is opened to be dispersed, and then the dispersed pouring part 330 is sufficiently cleaned, so that the steel wires from the bundling part 310 to the end of the steel wire rope 300 are free from grease and foreign matters. The wire rope 300 is then passed through the through-hole of the mold 100 so that the pouring part 330, one end of which has been subjected to a cleaning process, of the wire rope 300 is located in the inner cavity of the mold 100, and the through-hole of the mold 100 is filled with the bundling part 310. And then filling leak-proof agents into the side, close to the pouring part 330, of the bundling part 310 and gaps between the outer wall of the steel wire rope 300 and the wall forming the through hole, wherein the leak-proof agents are sodium chloride particles and calcium fluoride particles which are uniformly mixed, and the mass ratio of the sodium chloride to the calcium fluoride is 2: 3. And then injecting alloy liquid containing bismuth into the die 100, keeping for 18s, knocking the edge of the die 100, keeping for 5 minutes after the alloy liquid in the inner cavity of the die 100 is completely solidified, and taking out the steel wire rope 300 from the die 100. The same procedure is used for preventing the alloy liquid from leaking from the other end of the wire rope 300.
A test method for breaking tension of a steel wire rope comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample.
Example 4
A method for preventing alloy liquid from leaking in a preparation process of a steel wire rope sample is characterized in that a steel wire rope 300 is bundled at positions close to two end parts, a bundling part 310 divides the steel wire rope 300 into a pouring part 330 and a tension testing part 320, and the pouring part 330 is positioned at the end part of the steel wire rope 300. Then, the pouring part 330 is opened to be dispersed, and then the dispersed pouring part 330 is sufficiently cleaned, so that the steel wires from the bundling part 310 to the end of the steel wire rope 300 are free from grease and foreign matters. The wire rope 300 is then passed through the through-hole of the mold 100 so that the pouring part 330, one end of which has been subjected to a cleaning process, of the wire rope 300 is located in the inner cavity of the mold 100, and the through-hole of the mold 100 is filled with the bundling part 310. And then filling leak-proof agents into the side, close to the pouring part 330, of the bundling part 310 and gaps between the outer wall of the steel wire rope 300 and the wall forming the through hole, wherein the leak-proof agents are sodium chloride particles and calcium fluoride particles which are uniformly mixed, and the mass ratio of the sodium chloride to the calcium fluoride is 3: 2. And then injecting alloy liquid containing bismuth into the die 100, keeping for 20s, knocking the edge of the die 100, keeping for 5 minutes after the alloy liquid in the inner cavity of the die 100 is completely solidified, and taking out the steel wire rope 300 from the die 100. The same procedure is used for preventing the alloy liquid from leaking from the other end of the wire rope 300.
A test method for breaking tension of a steel wire rope comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample.
Example 5
A method for preventing alloy liquid from leaking in a preparation process of a steel wire rope sample is characterized in that a steel wire rope 300 is bundled at positions close to two end parts, a bundling part 310 divides the steel wire rope 300 into a pouring part 330 and a tension testing part 320, and the pouring part 330 is positioned at the end part of the steel wire rope 300. Then, the pouring part 330 is opened to be dispersed, and then the dispersed pouring part 330 is sufficiently cleaned, so that the steel wires from the bundling part 310 to the end of the steel wire rope 300 are free from grease and foreign matters. The wire rope 300 is then passed through the through-hole of the mold 100 so that the pouring part 330, one end of which has been subjected to a cleaning process, of the wire rope 300 is located in the inner cavity of the mold 100, and the through-hole of the mold 100 is filled with the bundling part 310. And then filling leak-proof agents into the side, close to the pouring part 330, of the bundling part 310 and gaps between the outer wall of the steel wire rope 300 and the wall forming the through hole, wherein the leak-proof agents are sodium chloride particles and calcium fluoride particles which are uniformly mixed, and the mass ratio of the sodium chloride to the calcium fluoride is 1: 4. And then injecting alloy liquid containing bismuth into the die 100, keeping for 30s, knocking the edge of the die 100, keeping for 4 minutes after the alloy liquid in the inner cavity of the die 100 is completely solidified, and taking out the steel wire rope 300 from the die 100. The same procedure is used for preventing the alloy liquid from leaking from the other end of the wire rope 300.
A test method for breaking tension of a steel wire rope comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample.
Comparative example 1
The preparation method of the steel wire rope sample comprises the following steps: the wire rope 300 is bundled at positions near both ends, the bundling section 310 divides the wire rope 300 into a pouring section 330 and a tension testing section 320, and the pouring section 330 is positioned at the end of the wire rope 300. Then, the pouring part 330 is opened to be dispersed, and then the dispersed pouring part 330 is sufficiently cleaned, so that the steel wires from the bundling part 310 to the end of the steel wire rope 300 are free from grease and foreign matters. The wire rope 300 is then passed through the through-hole of the mold 100 so that the pouring part 330, one end of which has been subjected to a cleaning process, of the wire rope 300 is located in the inner cavity of the mold 100, and the through-hole of the mold 100 is filled with the bundling part 310. Injecting alloy liquid containing bismuth into the die 100, keeping for 30s, knocking the edge of the die 100, keeping for 4 minutes after the alloy liquid in the inner cavity of the die 100 is completely solidified, and taking out the steel wire rope 300 from the die 100. The same procedure is followed for the other end of the cable 300.
Comparative example 2
The preparation method of the steel wire rope sample comprises the following steps: the wire rope 300 is bundled at positions near both ends, the bundling section 310 divides the wire rope 300 into a pouring section 330 and a tension testing section 320, and the pouring section 330 is positioned at the end of the wire rope 300. Then, the pouring part 330 is opened to be dispersed, and then the dispersed pouring part 330 is sufficiently cleaned, so that the steel wires from the bundling part 310 to the end of the steel wire rope 300 are free from grease and foreign matters. The wire rope 300 is then passed through the through-hole of the mold 100 so that the pouring part 330, one end of which has been subjected to a cleaning process, of the wire rope 300 is located in the inner cavity of the mold 100, and the through-hole of the mold 100 is filled with the bundling part 310. And then filling leak-proof agents into the side, close to the pouring part 330, of the bundling part 310 and gaps between the outer wall of the steel wire rope 300 and the wall forming the through hole, wherein the leak-proof agents are sodium chloride particles and calcium fluoride particles which are uniformly mixed, and the mass ratio of the sodium chloride to the calcium fluoride is 1: 9. And then injecting alloy liquid containing bismuth into the die 100, keeping for 30s, knocking the edge of the die 100, keeping for 4 minutes after the alloy liquid in the inner cavity of the die 100 is completely solidified, and taking out the steel wire rope 300 from the die 100. The same procedure is followed for the other end of the cable 300.
Test examples
When the steel wire rope samples of examples 1 to 5 and comparative examples 1 to 2 were prepared, the leakage of the alloy liquid was visually observed. The results are reported in table 1.
TABLE 1 leakage of alloy fluids from steel wire rope samples of examples 1-5 and comparative examples 1-2
As can be seen from Table 1, the methods for preventing leakage of alloy liquids according to examples 1 to 5 are effective, and substantially no leakage of alloy liquids is observed, while comparative example 1, in which no leakage preventive agent is added, is large in leakage. Comparing examples 1-5 with comparative example 2, it is found that the comparative example 2 also has some leakage of the alloy liquid during sample preparation, which illustrates that the leakage of the alloy liquid can be better prevented by adopting the proportions of the examples of the invention when the leak preventive of the examples of the invention is sodium chloride and calcium fluoride.
In summary, according to the leak preventer, the method for preventing the alloy liquid from leaking, and the steel wire rope sample provided by the embodiments of the present invention, the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample is provided, in which the leak preventer is filled near the binding portion of the steel wire rope, the melting point of the leak preventer is higher than that of the alloy liquid, the leak preventer does not react with the low melting point alloy liquid such as bismuth, antimony, tin, and zinc, and the leak preventer is in a granular form, and can fill gaps between steel wires, prevent the alloy liquid from leaking, and does not affect the breaking tension test of the steel wire rope. A test method for breaking tension of a steel wire rope comprises the following steps: and carrying out breaking tension test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample. The accuracy of the test result can be ensured, and the safety problem can be avoided.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (2)
1. A method for preventing alloy liquid from leaking in a preparation process of a steel wire rope sample is characterized by comprising the following steps: filling a leak preventer, which is granular, near the binding part of the steel wire rope before pouring the alloy liquid, wherein the melting point of the leak preventer is higher than that of the alloy liquid; the leak preventer comprises alkali metal halide and alkaline earth metal halide, wherein the alkali metal halide accounts for 20-60 wt% of the leak preventer; the alkaline earth metal halide accounts for 40-80 wt% of the leak preventer; the alkali metal halide is sodium chloride; the alkaline earth metal halide is calcium fluoride;
the two opposite sides of the bundling part of the steel wire rope are respectively a tension testing part and a pouring part, the pouring part is positioned at the end part of the steel wire rope and is in a dispersed state, and the anti-leakage agent is filled at one side of the bundling part close to the pouring part;
before filling the leak preventer, placing a pouring part of the steel wire rope into an inner cavity of a mold, wherein the bottom of the mold is provided with a through hole which is communicated with the inner cavity and has a diameter matched with the outer diameter of the steel wire rope, and the bundling part is positioned at the through hole and then filled with the leak preventer; the positions filled with the leak preventive comprise gaps among strands of the steel wire rope and the strands and the steel wires, and gaps among the outer wall of the steel wire rope and the wall forming the through hole;
after the leak preventive is filled, injecting alloy liquid into the die, and after the injection of the alloy liquid is finished, keeping the time for at least 12 seconds to vibrate the edge part of the die; and after the alloy liquid in the inner cavity of the mold is completely solidified, keeping for more than 2 minutes, and taking out the steel wire rope from the mold.
2. A test method for breaking tension of a steel wire rope is characterized by comprising the following steps: performing a breaking force test on the steel wire rope sample obtained by the method for preventing the alloy liquid from leaking in the preparation process of the steel wire rope sample according to claim 1; the breaking tension test is carried out on a testing machine, the clamping length of a clamp of the testing machine is H, the distance between a binding part at the same end and the end part of a steel wire rope sample is H1, the height of the filled anti-leakage agent is H2, H2 is not more than 8mm, and H is H1-H2.
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