High strength communication double wire grip hoop

Abstract

This invention relates to the field of clamp technology and proposes a high-strength double-suspension wire clamp for communication. The clamp body is phosphated and then assembled using connectors. The clamp body is composed of the following elements by weight percentage: Cr: 25%~27%, Ni: 2.5%~3.5%, Nb: 0.05%~0.11%, Mo: 0.2%~0.43%, Cu: 0.32%~0.55%, Sn: 0.05%~0.1%, Ta: 0.015%~0.023%, Si: 0.85%~0.91%, Zr: 0.12%~0.16%, Mn: 1.1%~1.6%, C≤0.05%, S: 0.015%~0.02%, P: 0.016%~0.022%, with the remainder being iron and other unavoidable impurities. This technical solution solves the problem of insufficient strength in related double-suspension wire clamps.

Description

Technical Field

[0001] This invention relates to the field of clamp technology, specifically to a high-strength double-suspension clamp for communication. Background Technology

[0002] Electrical components can be categorized into supports, connectors, and fasteners based on their function in power lines. Connectors include clamps, U-bolts, and various through bolts. Clamps, in particular, are components that use one material to hold or clamp another material; these include cable clamps, pole clamps, guy wire clamps, and suspension wire clamps. Suspension wire clamps are further divided into single-suspension and double-suspension clamps. Double-suspension clamps are more commonly used than single-suspension clamps.

[0003] Double-line clamps are commonly used in high-voltage power transmission lines for communications and other applications, or in large-scale hoisting operations, where they have a large bearing area and can support heavy loads. Therefore, double-line clamps with a long service life must possess high strength. However, the strength of existing double-line clamps still needs further improvement. Summary of the Invention

[0004] This invention proposes a high-strength double-suspension wire clamp for communication, which solves the problem of insufficient strength of double-suspension wire clamps in related technologies.

[0005] The technical solution of the present invention is as follows: A high-strength double-suspension wire clamp for communication is obtained by phosphate treatment of the clamp body and assembly with connectors. The clamp body is composed of the following elements by weight percentage: Cr: 25%~27%, Ni: 2.5%~3.5%, Nb: 0.05%~0.11%, Mo: 0.2%~0.43%, Cu: 0.32%~0.55%, Sn: 0.05%~0.1%, Ta: 0.015%~0.023%, Si: 0.85%~0.91%, Zr: 0.12%~0.16%, Mn: 1.1%~1.6%, C≤0.05%, S: 0.015%~0.02%, P: 0.016%~0.022%, with the remainder being iron and other unavoidable impurities.

[0006] As a further technical solution, the ratio of 0.0679≤Nb+1.5Ta to 0.2Zr is ≤0.081 by weight percentage.

[0007] As a further technical solution, the phosphating solution used in the phosphating treatment includes the following components: main film-forming agent, sodium molybdate, nitrate, tartaric acid, adsorbent and water, wherein the adsorbent is a compound whose molecular structure includes hydroxyl, phenyl and sulfonic acid groups.

[0008] As a further technical solution, the adsorbent includes one or both of 4-hydroxybenzenesulfonic acid and 2-hydroxybenzenesulfonic acid.

[0009] As a further technical solution, the adsorbent also includes 3-hydroxypropanesulfonic acid.

[0010] As a further technical solution, the adsorbent is 4-hydroxybenzenesulfonic acid and 3-hydroxypropanesulfonic acid in a mass ratio of 5~7:1.

[0011] As a further technical solution, the mass ratio of the main film-forming agent, sodium molybdate, nitrate, tartaric acid, adsorbent and water is 10~17:2~4:0.5~1:1:1~2:1000.

[0012] As a further technical solution, the main film-forming agent is composed of zinc dihydrogen phosphate, sodium dihydrogen phosphate and phosphoric acid in a mass ratio of 8~12:0.1:1.9~4.9.

[0013] As a further technical solution, the nitrate includes one or both of potassium nitrate and calcium nitrate.

[0014] This invention also proposes a method for preparing a high-strength double-suspension wire clamp for communication, which includes the following steps: batching, melting, and casting according to the elemental composition to obtain a clamp body blank; descaling the clamp body blank and then rolling, machining, and heat treating it to obtain the clamp body; pickling and washing the clamp body and then phosphating it, washing it, drying it, and assembling it with connectors to obtain the double-suspension wire clamp.

[0015] The working principle and beneficial effects of this invention are as follows: In this invention, the elemental composition of the hoop is optimized, using Cr, Ni, Nb, Mo, Cu, Sn, Ta, Si, Zr, Mn, C, S, P and Fe as the elements of the hoop. At the same time, the content of each element is optimized, which improves the tensile strength of the hoop and thus achieves the effect of improving the strength of the double suspension line hoop. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] A specific embodiment of the first aspect of the present invention provides a high-strength double-suspension wire clamp for communication, which is obtained by phosphate treatment of the clamp body and assembly by connectors; wherein the clamp body is composed of the following elements by weight percentage: Cr: 25%~27%, Ni: 2.5%~3.5%, Nb: 0.05%~0.11%, Mo: 0.2%~0.43%, Cu: 0.32%~0.55%, Sn: 0.05%~0.1%, Ta: 0.015%~0.023%, Si: 0.85%~0.91%, Zr: 0.12%~0.16%, Mn: 1.1%~1.6%, C≤0.05%, S: 0.015%~0.02%, P: 0.016%~0.022%, with the remainder being iron and other unavoidable impurities.

[0018] In this invention, the chromium (Cr) element in the double-line clamp body is a medium-level carbide-forming element. With increasing chromium content, various carbides can be formed, significantly affecting the clamp body's performance. Simultaneously, chromium increases hardenability and has a secondary hardening effect. Furthermore, chromium also increases the clamp body's wear resistance, high-temperature oxidation resistance, and resistance to corrosion from oxidizing media.

[0019] In this invention, the Ni element in the double-suspension clamp body has a grain-refining effect, which improves the low-temperature performance of the clamp body, especially its toughness. Furthermore, when used in combination with chromium and molybdenum, it achieves a good balance of strength and toughness in terms of overall mechanical properties after heat treatment.

[0020] In this invention, the Nb element in the double-suspension clamp body is a strong carbide-forming element that also has a grain-refining effect, thereby increasing strength without affecting plasticity and toughness.

[0021] In this invention, the Mo element in the double-hanging wire clamp body is a strong carbide-forming element, often used in combination with manganese and chromium. It can significantly improve hardenability, as well as the hot strength and creep strength of the clamp body, and at the same time improve the clamp body's resistance to corrosion by organic acids and reducing media.

[0022] In this invention, the Cu element in the double-suspender hoop body does not form carbides with carbon, its solid solution strengthening effect is second only to phosphorus, and its coexistence with phosphorus can improve the atmospheric corrosion resistance of the hoop body.

[0023] In this invention, the Sn element in the double-hanging wire clamp body can improve the strength, hardness and wear resistance of the clamp body, but its excessive content also has negative effects, namely, it can cause intergranular segregation, which accumulates at the boundaries of eutectic clusters, leading to the formation of brittle intermediate phases and affecting the performance of the clamp body.

[0024] In this invention, the Ta element in the double-suspension hoop body is in the same group as niobium on the periodic table, and its various functions are similar to those of niobium. Adding it together with niobium can improve the strength of the hoop body.

[0025] In this invention, the silicon element in the double-suspender clamp body has an affinity for oxygen second only to aluminum and titanium, making it a commonly used deoxidizer. It does not form carbides in the clamp body and has a strong effect on improving the strength of the solid solution and the cold work hardening rate, but it also reduces the clamp body's toughness and plasticity. Furthermore, silicon significantly improves the overall mechanical properties of the clamp body, especially the elastic limit and yield strength ratio, and enhances the clamp body's corrosion resistance in the atmosphere.

[0026] In this invention, the Zr element in the double-hanging wire clamp body is a strong carbide-forming element that has the functions of degassing, purifying and refining grains, and is beneficial to the low-temperature performance and strength of the clamp body.

[0027] In this invention, the manganese (Mn) element in the double-suspension clamp body is a weak carbide-forming element with strong solid solution strengthening properties, which can improve the hardness and strength of the clamp body. Simultaneously, manganese is a good deoxidizer and desulfurizer; its reaction with sulfur to form MnS2 can prevent hot brittleness caused by sulfur.

[0028] In this invention, the carbon element in the double-hanging wire clamp body can form stable carbides with other elements, improving the performance of the clamp body, such as strength, hardness, and wear resistance.

[0029] This invention relates to the S and P elements in the double-suspension clamp body: Sulfur has very low solubility in iron and mainly exists in the form of sulfides. Phosphorus does not form carbides and is prone to severe segregation, making it a harmful element along with sulfur. However, phosphorus plays a strong role in improving the strength of the clamp body, and when used in combination with copper, it can also improve the clamp body's resistance to atmospheric corrosion.

[0030] In one embodiment of the present invention, the ratio of 0.0679 ≤ Nb + 1.5Ta to 0.2Zr is ≤ 0.081 by weight percentage.

[0031] This invention limits the ratio of Nb+1.5Ta to 0.2Zr to the range of 0.0679~0.081, further improving the tensile strength of the hoop body in the double-hanging wire clamp and increasing the tensile strength to over 1763MPa.

[0032] In one embodiment of the present invention, the phosphating solution used in the phosphating treatment includes the following components: a main film-forming agent, sodium molybdate, nitrate, tartaric acid, adsorbent, and water, wherein the adsorbent is a compound whose molecular structure includes hydroxyl, phenyl, and sulfonic acid groups.

[0033] In this invention, the adsorbent can be any compound whose molecular structure includes hydroxyl, phenyl and sulfonic acid groups, preferably including one or two of 4-hydroxybenzenesulfonic acid and 2-hydroxybenzenesulfonic acid, more preferably 4-hydroxybenzenesulfonic acid.

[0034] By adding the adsorbent, the hydroxyl groups in the adsorbent can form hydrogen bonds with the main film-forming agent, while the sulfonic acid groups are adsorbed on the surface of the hoop, causing the benzenesulfonic acid structure to be oriented on the metal surface, improving the density of the phosphating film and improving its quality, thus achieving the effect of improving the corrosion resistance of the double suspension hoop.

[0035] In one embodiment of the present invention, the adsorbent further includes 3-hydroxypropanesulfonic acid.

[0036] This invention further improves the corrosion resistance of double-suspender clamps by adding 3-hydroxypropanesulfonic acid to compounds whose molecular structure includes hydroxyl, phenyl and sulfonic acid groups as adsorbents.

[0037] In one embodiment of the present invention, the adsorbent is 4-hydroxybenzenesulfonic acid and 3-hydroxypropanesulfonic acid in a mass ratio of 5 to 7:1.

[0038] This invention uses 4-hydroxybenzenesulfonic acid and 3-hydroxypropanesulfonic acid in a mass ratio of 5~7:1 as adsorbents, which further improves the corrosion resistance of the double suspension wire clamp.

[0039] In one embodiment of the present invention, the mass ratio of the main film-forming agent, sodium molybdate, nitrate, tartaric acid, adsorbent and water is 10~17:2~4:0.5~1:1:1~2:1000.

[0040] In one embodiment of the present invention, the main film-forming agent is composed of zinc dihydrogen phosphate, sodium dihydrogen phosphate and phosphoric acid in a mass ratio of 8~12:0.1:1.9~4.9.

[0041] In one embodiment of the present invention, the nitrate includes one or both of potassium nitrate and calcium nitrate.

[0042] A specific embodiment of the second aspect of the present invention provides a method for preparing a high-strength double-suspension wire clamp for communication, used to prepare the double-suspension wire clamp provided in the specific embodiment of the first aspect of the present invention, comprising the following steps: batching, melting, and casting according to the elemental composition by weight percentage to obtain a clamp body blank; descaling the clamp body blank and then rolling, machining, and heat treating to obtain the clamp body; pickling and washing the clamp body and then phosphating, washing, and drying, and assembling it with connectors to obtain the double-suspension wire clamp.

[0043] The present invention will now be described in detail with reference to preferred embodiments and comparative examples. The preferred embodiments of the invention described below can be modified in various ways, and therefore the scope of the invention should not be construed as limited to the preferred embodiments described in detail below. Preferred embodiments are provided to help those skilled in the art to more readily understand the invention.

[0044] Example 1 The hoop body is composed of the following elements by weight percentage: Cr: 27%, Ni: 2.5%, Nb: 0.05%, Mo: 0.43%, Cu: 0.32%, Sn: 0.05%, Ta: 0.015%, Si: 0.85%, Zr: 0.12%, Mn: 1.1%, C: 0.05%, S: 0.015%, P: 0.016%, with the remainder being iron and other unavoidable impurities; The elements are batched, smelted, and cast according to the above weight percentages to obtain the hoop blank; the hoop blank is sprayed with water at 15MPa for 40 minutes to remove phosphorus, then rolled, machined, and heat-treated to obtain the hoop body; the hoop body is pickled with 5wt% hydrochloric acid, washed with water, phosphated in phosphating solution at 25℃ for 15 minutes, washed with water, dried, and assembled with connecting bolts to obtain the double suspension hoop. The preparation method of phosphating solution is as follows: By weight, 17 parts of the main film-forming agent (composed of zinc dihydrogen phosphate, sodium dihydrogen phosphate and phosphoric acid in a mass ratio of 12:0.1:4.9), 4 parts of sodium molybdate, 0.5 parts of potassium nitrate, 1 part of tartaric acid, 2 parts of adsorbent (4-hydroxybenzenesulfonic acid) and 1000 parts of water were mixed and stirred at 30℃ and 300r / min for 40min until homogeneous to obtain the phosphating solution.

[0045] Example 2 The hoop is composed of the following elements by weight percentage: Cr: 26%, Ni: 3.1%, Nb: 0.07%, Mo: 0.34%, Cu: 0.46%, Sn: 0.08%, Ta: 0.018%, Si: 0.90%, Zr: 0.14%, Mn: 1.3%, C: 0.02%, S: 0.018%, P: 0.020%, with the remainder being iron and other unavoidable impurities; The elements are batched, smelted, and cast according to the above weight percentages to obtain the hoop blank; the hoop blank is sprayed with water at 15MPa for 40 minutes to remove phosphorus, then rolled, machined, and heat-treated to obtain the hoop body; the hoop body is pickled with 5wt% hydrochloric acid, washed with water, phosphated in phosphating solution at 25℃ for 15 minutes, washed with water, dried, and assembled with connecting bolts to obtain the double suspension hoop. The preparation method of phosphating solution is as follows: By weight, 15 parts of the main film-forming agent (composed of zinc dihydrogen phosphate, sodium dihydrogen phosphate and phosphoric acid in a mass ratio of 10:0.1:2.9), 3 parts of sodium molybdate, 0.7 parts of potassium nitrate, 1 part of tartaric acid, 1.5 parts of adsorbent (4-hydroxybenzenesulfonic acid) and 1000 parts of water are mixed and stirred at 30℃ and 300r / min for 40min until homogeneous to obtain the phosphating solution.

[0046] Example 3 The hoop is composed of the following elements by weight percentage: Cr: 25%, Ni: 3.5%, Nb: 0.11%, Mo: 0.2%, Cu: 0.55%, Sn: 0.1%, Ta: 0.023%, Si: 0.91%, Zr: 0.16%, Mn: 1.6%, C: 0.01%, S: 0.02%, P: 0.022%, with the remainder being iron and other unavoidable impurities; The elements are batched, smelted, and cast according to the above weight percentages to obtain the hoop blank; the hoop blank is sprayed with water at 15MPa for 40 minutes to remove phosphorus, then rolled, machined, and heat-treated to obtain the hoop body; the hoop body is pickled with 5wt% hydrochloric acid, washed with water, phosphated in phosphating solution at 25℃ for 15 minutes, washed with water, dried, and assembled with connecting bolts to obtain the double suspension hoop. The preparation method of phosphating solution is as follows: By weight, 10 parts of the main film-forming agent (composed of zinc dihydrogen phosphate, sodium dihydrogen phosphate and phosphoric acid in a mass ratio of 8:0.1:1.9), 2 parts of sodium molybdate, 1 part of potassium nitrate, 1 part of tartaric acid, 1 part of adsorbent (4-hydroxybenzenesulfonic acid) and 1000 parts of water are mixed and stirred at 30℃ and 300r / min for 40min until homogeneous to obtain the phosphating solution.

[0047] Example 4 The only difference from Example 2 is: The hoop is composed of the following elements by weight percentage: Cr: 26%, Ni: 3.1%, Nb: 0.06%, Mo: 0.34%, Cu: 0.46%, Sn: 0.08%, Ta: 0.016%, Si: 0.90%, Zr: 0.15%, Mn: 1.3%, C: 0.02%, S: 0.018%, P: 0.020%, with the remainder being iron and other unavoidable impurities.

[0048] Example 5 The only difference from Example 2 is: The hoop is composed of the following elements by weight percentage: Cr: 26%, Ni: 3.1%, Nb: 0.09%, Mo: 0.34%, Cu: 0.46%, Sn: 0.08%, Ta: 0.02%, Si: 0.90%, Zr: 0.135%, Mn: 1.3%, C: 0.02%, S: 0.018%, P: 0.020%, with the remainder being iron and other unavoidable impurities.

[0049] Example 6 The only difference from Example 2 is: The hoop is composed of the following elements by weight percentage: Cr: 26%, Ni: 3.1%, Nb: 0.1%, Mo: 0.34%, Cu: 0.46%, Sn: 0.08%, Ta: 0.022%, Si: 0.90%, Zr: 0.13%, Mn: 1.3%, C: 0.02%, S: 0.018%, P: 0.020%, with the remainder being iron and other unavoidable impurities.

[0050] Example 7 The only difference from Example 5 is that the adsorbent is 2-hydroxybenzenesulfonic acid.

[0051] Example 8 The only difference from Example 5 is that the adsorbent is 4-hydroxybenzenesulfonic acid and 3-hydroxypropanesulfonic acid in a mass ratio of 5:1.

[0052] Example 9 The only difference from Example 5 is that the adsorbent is 4-hydroxybenzenesulfonic acid and 3-hydroxypropanesulfonic acid in a mass ratio of 7:1.

[0053] Example 10 The only difference from Example 5 is that the adsorbent is 3-hydroxypropanesulfonic acid.

[0054] Example 11 The only difference from Example 5 is that the adsorbent is 4-hydroxybenzenesulfonic acid and 3-hydroxypropanesulfonic acid in a mass ratio of 7:1.

[0055] Comparative Example 1 The only difference from Example 1 is: The hoop body is composed of the following elements by weight percentage: Cr: 27%, Ni: 2.5%, Nb: 0.05%, Mo: 0.43%, Cu: 0.32%, Sn: 0.05%, Ta: 0.015%, Si: 0.85%, Zr: 0.12%, Mn: 1.1%, C: 0.05%, S: 0.015%, P: 0.016%, with the remainder being iron and other unavoidable impurities; The following performance tests were performed on the clamp body before assembly: (1) Tensile strength: The room temperature tensile strength test was conducted according to the method in GB / T 228.1-2021. The final test result is the average of the test results of 3 samples. The results are recorded in Table 1.

[0056] (2) Corrosion resistance: Immerse in 20wt% hydrochloric acid solution for 48h, measure the mass before and after immersion, and calculate the mass loss rate according to the following formula; The mass loss rate (%) = (mass before soaking - mass after soaking) ÷ mass before soaking × 100%, and the results are recorded in Table 2.

[0057] Table 1 Tensile strength test results

[0058] As can be seen from Table 1, compared with Comparative Example 1, Examples 1 to 6 have higher tensile strength, indicating that the hoop body provided by the present invention after optimizing the element composition has high strength, thereby improving the strength of the double suspension line hoop.

[0059] Table 2 Corrosion Resistance Test Results

[0060] As shown in Table 2, the mass loss rate of Example 5 is lower than that of Examples 7 and 10, indicating that using 4-hydroxybenzenesulfonic acid as an adsorbent, compared to 3-hydroxypropanesulfonic acid or 2-hydroxybenzenesulfonic acid, can further improve the corrosion resistance of the double-suspension wire clamp. The mass loss rates of Examples 8-9 are lower than those of Examples 5, 7, and 10-11, indicating that using 4-hydroxybenzenesulfonic acid and 3-hydroxypropanesulfonic acid in a mass ratio of 5-7:1 as adsorbents can further improve the corrosion resistance of the double-suspension wire clamp.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high strength double line grip thimble for communication, characterized by, The hoop body is obtained by phosphate treatment and then assembled with connectors; the hoop body is composed of the following elements by weight percentage. Composition: Cr: 25%~27%, Ni: 2.5%~3.5%, Nb: 0.05%~0.11%, Mo: 0.2%~0.43%, Cu: 0.32%~0.55%, Sn: 0.05%~0.1%, Ta: 0.015%~0.023%, Si: 0.85%~0.91%, Zr: 0.12%~0.16%, Mn: 1.1%~1.6%, C≤0.05%, S: 0.015%~0.02%, P: 0.016%~0.022%, with the remainder being iron and other unavoidable impurities.

2. A high strength double line grip thimble for communication according to claim 1, wherein, By weight percentage, the ratio of 0.0679≤Nb+1.5Ta to 0.2Zr is ≤0.

081.

3. The high strength double thready griping hoop for communication according to claim 1, wherein, The phosphating solution used in the phosphating treatment includes the following components: main film-forming agent, sodium molybdate, nitrate, tartaric acid, adsorbent, and water. The adsorbent is a compound whose molecular structure includes hydroxyl, phenyl, and sulfonic acid groups.

4. A high strength double line grip thimble according to claim 3, wherein, The adsorbent includes one or both of 4-hydroxybenzenesulfonic acid and 2-hydroxybenzenesulfonic acid.

5. A high strength double line grip thimble according to claim 4, wherein, The adsorbent also includes 3-hydroxypropanesulfonic acid.

6. A high strength double line grip thimble according to claim 5, wherein, The adsorbent is 4-hydroxybenzenesulfonic acid and 3-hydroxypropanesulfonic acid in a mass ratio of 5~7:

1.

7. A high strength double line grip thimble as claimed in claim 3 wherein, The mass ratio of the main film-forming agent, sodium molybdate, nitrate, tartaric acid, adsorbent and water is 10~17:2~4:0.5~1:1:1~2:1000.

8. A high strength double line grip thimble for communication according to claim 3, wherein, The main film-forming agent is prepared in a mass ratio of 8~12: It consists of zinc dihydrogen phosphate, sodium dihydrogen phosphate, and phosphoric acid in a ratio of 0.1:1.9~4.

9.

9. The high strength double thready griping hoop for communication according to claim 3, wherein, The nitrates include one or both of potassium nitrate and calcium nitrate.

10. A method for preparing a high-strength double-suspension wire clamp for communication, used to prepare the double-suspension wire clamp according to any one of claims 1 to 9, characterized in that, Includes the following steps: According to the stated elemental composition, the raw materials are batched, smelted, and cast to obtain a hoop blank; after descaling, the hoop blank is rolled, machined, and heat-treated to obtain the hoop body; the hoop body is pickled, washed with water, phosphated, washed with water, dried, and assembled with connectors to obtain a double-hanging wire hoop.

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