Hollow grouting mining anchor cable and preparation process

Abstract

The hollow grouting mining anchor cable preparation technology comprises the steps that S1, raw materials are prepared, and hollow steel bars and steel strands are obtained to serve as the raw materials; s2, cutting; s3, welding is conducted, specifically, a connector base is additionally arranged at one end of the hollow steel bar, one end of each steel strand is welded to the connector base, the number of the steel strands is multiple, and a welded anchor cable is obtained; s4, secondary heat treatment is conducted, specifically, the steel strand of the welded anchor cable is put into heat treatment equipment; s5, polishing is conducted; and S6, weaving. The welded anchor cable is subjected to secondary heat treatment, the structure and performance of the welded position can be further optimized, it is ensured that the strength and toughness of a welded joint reach the best balance, in addition, secondary heat treatment is also beneficial for eliminating residual stress generated in the welding process, the overall stability and durability of the anchor cable are improved, and the service life of the anchor cable is prolonged. And it is ensured that the manufactured hollow mining grouting anchor cable has the optimal steel wire tensile strength and the maximum force of the hollow steel strand.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of hollow grouting mining anchor cables, and in particular to a preparation process of hollow grouting mining anchor cables. Background Art

[0002] Hollow grouting mining anchor cable is a special anchor cable made of spiral rib prestressed steel wire and built-in grouting pipe. It is suitable for the support and reinforcement of mine tunnels, chambers and intersections, and can also be used for the reinforcement of geotechnical engineering such as tunnels and slopes. Its advantage is that the use of spiral prestressed steel wire greatly enhances the anchor strength, load transfer performance and anchor ductility of the anchor cable, and the performance is significantly improved compared with the traditional round steel strand anchor cable.

[0003] However, the hollow grouting mining anchor cable used in deep well high ground pressure mining areas often fails under dynamic load due to stress concentration at the tail, especially within 2 meters from the hole due to the complex environment. This kind of fracture usually manifests as brittle fracture, and the necking is not obvious. Considering that the anchor cable in deep well high ground pressure mining areas is already under high static load, coupled with potential impact load, the anchor cable is very easy to be damaged.

[0004] In view of this, the industry currently generally uses high-strength anchor cables of grade 1860 or 1860. However, facing the extreme conditions of high ground pressure in deep wells, there is still a lack of 2230 strength grade products with safety mark certification on the market, such as SKP22-1 / 2230 mining anchor cables, SKZ22-1 / 2230 hollow grouting mining anchor cables and KM22-2230 mining anchor cable anchors.

[0005] To this end, we provide a hollow grouting mining anchor preparation process to prepare products that meet the 2230 strength grade to solve the above problems. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention provides a hollow grouting mining anchor cable preparation process, which effectively releases the residual stress generated during welding by adding a second heat treatment process and focusing mainly on the welding part of the anchor cable, and improves the metallographic structure of the welded joint to make it more uniform and dense. This not only improves the mechanical properties of the material such as hardness, toughness and wear resistance, but also makes the component perform better when subjected to dynamic loads and repeated stresses.

[0007] In order to achieve the above object, the hollow grouting mining anchor cable preparation process adopted by the present invention comprises the following steps:

[0008] S1. Raw material preparation, obtaining hollow steel bars and steel strands as raw materials;

[0009] S2. Cutting: according to the length and diameter of the anchor cable required by the design, the raw materials are cut by cutting equipment to obtain steel strands and hollow steel bars of the same length;

[0010] S3. Welding, installing a joint seat at one end of the hollow steel bar, and welding one end of the steel strand to the joint seat, and the number of steel strands is multiple, and obtaining the anchor cable after welding;

[0011] S4. The second heat treatment is to put the steel strands of the anchor cable after welding into the heat treatment equipment;

[0012] The step S4 further comprises:

[0013] The welded portion of the anchor cable after welding is put into a second heat treatment device, and the heat treatment temperature is controlled to be above 440°C.

[0014] S5. Grinding: Grinding the anchor cable after heat treatment to remove the oxide scale and burrs on the anchor cable after heat treatment;

[0015] S6. Weaving, spirally tightening a plurality of steel strands located outside the hollow steel bar to obtain a woven anchor cable;

[0016] S7. Tighten: tighten the braided steel strands.

[0017] The present invention performs a second heat treatment on the anchor cable after welding, which can further optimize the structure and performance of the weld. By controlling the heat treatment temperature to be above 440°C, it can ensure that the strength and toughness of the welded joint reach the best balance. In addition, the second heat treatment also helps to eliminate the residual stress generated during the welding process, improve the overall stability and durability of the anchor cable, and ensure that the manufactured hollow mining grouting anchor cable has the best steel wire tensile strength and the maximum force of the hollow steel strand.

[0018] As a further optimization of the above solution, step S4 further includes:

[0019] The heat treatment line speed is 15m / min, and the lay length of the steel strand is 600mm.

[0020] On the basis of the above process, after the materials arrive, the steel strands are further processed as follows:

[0021] The step S1 further comprises:

[0022] S1-1, drawing treatment, putting the steel strand into the drawing equipment, the drawing equipment adopts nine-pass drawing, the drawing speed is controlled at 3.4-3.8m / s, and the compression rate of each pass is controlled at more than 15%.

[0023] By subjecting the transported steel strand materials to a nine-pass drawing process, the mechanical properties of the steel strands can be effectively improved, making the structure of the steel strands more uniform and dense. Specifically, the nine-pass drawing process can refine the grain structure of the steel strands and improve the tensile strength and elongation of the steel strands.

[0024] The step S1-1 further includes:

[0025] Surface treatment: the steel strands are put into surface treatment equipment such as pickling and phosphating, and the treated steel strands are put into drawing equipment, so as to remove impurities on the surface of the steel strands through pickling, improve the surface cleanliness, and provide a good base for subsequent treatment. At the same time, phosphating combines with the steel strands to form a dense phosphate conversion film, which enhances the anti-corrosion performance and prevents the steel wire from rusting in a humid and corrosive environment, thereby extending the service life of the steel strands. In addition, this layer of phosphate conversion film also has good lubricity, which can reduce the friction coefficient of the steel wire during the drawing process and improve the drawing efficiency.

[0026] More importantly, the process of the present invention further adds the following steps in step S1:

[0027] S1-2, first heat treatment, putting the steel strand into the first heat treatment equipment, the first heat treatment equipment includes an induction heating quenching process and a tempering process; the heating quenching temperature of the heating equipment is between 820-850℃, and the temperature is kept for 2-3s, and the tempering temperature is between 150-170℃, and cooled to room temperature; between the induction heating quenching process and the tempering process, there is also:

[0028] Carburizing treatment: the quenched steel strand is put into a carburizing treatment device for carburizing treatment. The carburizing treatment adopts a low-temperature carburizing process. The temperature of the low-temperature carburizing process is 450-500°C.

[0029] After the purchased steel strands are subjected to the first heat treatment, the subsequent processing steps are carried out. The strength and toughness of the steel strands are significantly improved through quenching, tempering and carburizing processes. In particular, the tensile strength of the steel strands can reach 2230MPa, and the maximum force of the hollow steel strands is greater than or equal to 512KN. Specifically:

[0030] The quenching treatment causes the internal structure of the steel to undergo austenite transformation, and uses a rapid cooling process to obtain structures with high hardness and strength such as martensite or bainite, thereby improving the overall bearing capacity of the anchor cable. The subsequent tempering treatment eliminates the internal stress and brittleness caused by quenching, while adjusting the organizational structure of the steel, maintaining or improving its toughness, so that the anchor cable has good comprehensive mechanical properties. At the same time, the low-temperature carburizing process is added to it to increase the carbon content on the surface of the steel, thereby improving its hardness and wear resistance, while maintaining the internal toughness and strength, reducing the risk of deformation and cracking of the material during heat treatment, and optimizing the overall organizational structure.

[0031] As a further optimization of the above-mentioned solution, the present invention also provides a hollow grouting mining anchor cable prepared by the hollow grouting mining anchor cable preparation process in any of the above-mentioned technical solutions.

[0032] The hollow grouting mining anchor cable preparation process of the present invention has the following beneficial effects:

[0033] 1. The hollow grouting mining anchor cable preparation process of the present invention can further optimize the structure and performance of the weld by performing a second heat treatment on the anchor cable after welding. By controlling the heat treatment temperature above 440°C, it can be ensured that the strength and toughness of the welded joint are optimally balanced. In addition, the second heat treatment also helps to eliminate the residual stress generated during the welding process, improve the overall stability and durability of the anchor cable, and ensure that the manufactured hollow grouting mining anchor cable has the best steel wire tensile strength and the maximum force of the hollow steel strand.

[0034] 2. The hollow grouting mining anchor preparation process of the present invention effectively improves the mechanical properties of the steel strands by subjecting the transported steel strand materials to a nine-pass drawing process, making the structure of the steel strands more uniform and dense. Specifically, the nine-pass drawing process can refine the grain structure of the steel strands and improve the tensile strength and elongation of the steel strands.

[0035] 3. The hollow grouting mining anchor cable preparation process of the present invention performs a first heat treatment on the purchased steel strands, and then performs subsequent processing steps, and significantly improves the strength and toughness of the steel strands through quenching, tempering and carburizing processes, especially the tensile strength of the steel strands can reach 2230MPa, and the maximum force of the hollow steel strands is greater than or equal to 512KN. Specifically:

[0036] The quenching treatment causes the internal structure of the steel to undergo austenite transformation, and uses a rapid cooling process to obtain structures with high hardness and strength such as martensite or bainite, thereby improving the overall bearing capacity of the anchor cable. The subsequent tempering treatment eliminates the internal stress and brittleness caused by quenching, while adjusting the organizational structure of the steel, maintaining or improving its toughness, so that the anchor cable has good comprehensive mechanical properties. At the same time, the low-temperature carburizing process is added to it to increase the carbon content on the surface of the steel, thereby improving its hardness and wear resistance, while maintaining the internal toughness and strength, reducing the risk of deformation and cracking of the material during heat treatment, and optimizing the overall organizational structure.

[0037] With reference to the following description and drawings, a specific embodiment of the present invention is disclosed in detail, indicating the manner in which the principle of the present invention can be adopted. It should be understood that the scope of the embodiment of the present invention is not limited thereby, and the embodiment of the present invention includes many changes, modifications and equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the process flow of the hollow grouting mining anchor cable preparation process;

[0039] Figure 2 It is a schematic diagram of the process flow of the drawing process in the present invention;

[0040] Figure 3 This is a schematic diagram of the process flow of the first heat treatment in the present invention;

[0041] Figure 4 This is a schematic diagram of the impact force-displacement curve of the 1860 grade anchor cable;

[0042] Figure 5 This is a schematic diagram of the impact force-displacement curve of the hollow mining grouting anchor cable of the present application;

[0043] Figure 6 It is a schematic diagram of the structure of the hollow grouting mining anchor cable of the present application in the present invention.

[0044] In the figure: 1. Hollow grouting mining anchor cable. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0046] It should be noted that when an element is referred to as being "disposed on, provided with" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected, connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. "Fixed connection" means a fixed connection. There are many ways of fixed connection, which are not within the scope of protection of this article. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only and do not represent the only implementation method.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] Please refer to the instruction manual Figure 1 The present invention provides a first embodiment of a hollow grouting mining anchor cable preparation process, the hollow grouting mining anchor cable preparation process comprising the following steps:

[0049] S1. Raw material preparation, obtaining hollow steel bars and steel strands as raw materials;

[0050] S2. Cutting: according to the length and diameter of the anchor cable required by the design, the raw materials are cut by cutting equipment to obtain steel strands and hollow steel bars of the same length;

[0051] S3. Welding, installing a joint seat at one end of the hollow steel bar, and welding one end of the steel strand to the joint seat, and the number of steel strands is multiple, and obtaining the anchor cable after welding;

[0052] S4. The second heat treatment is to put the steel strands of the anchor cable after welding into the heat treatment equipment;

[0053] The step S4 further comprises:

[0054] The welded portion of the anchor cable after welding is put into a second heat treatment device, and the heat treatment temperature is controlled to be above 440°C. Preferably, the temperature can be controlled between 440°C and 500°C.

[0055] S5. Grinding: Grinding the anchor cable after heat treatment to remove the oxide scale and burrs on the anchor cable after heat treatment;

[0056] S6. Weaving, spirally tightening a plurality of steel strands located outside the hollow steel bar to obtain a woven anchor cable;

[0057] S7. Tighten: tighten the braided steel strands.

[0058] It should be noted that the tightening process can be performed by means of components such as tightening hoops.

[0059] The present invention performs a second heat treatment on the anchor cable after welding, which can further optimize the structure and performance of the weld. By controlling the heat treatment temperature to be above 440°C, it can ensure that the strength and toughness of the welded joint reach the best balance. In addition, the second heat treatment also helps to eliminate the residual stress generated during the welding process, improve the overall stability and durability of the anchor cable, and ensure that the manufactured hollow mining grouting anchor cable has the best steel wire tensile strength and the maximum force of the hollow steel strand.

[0060] Furthermore, the step S4 further includes:

[0061] The heat treatment line speed is 15m / min, and the lay length of the steel strand is 600mm.

[0062] Please refer to the instruction manual Figure 1 And the instruction manual Figure 2 The present invention provides a second embodiment of a hollow grouting mining anchor cable preparation process, the hollow grouting mining anchor cable preparation process comprising the following steps:

[0063] On the basis of the process steps of the first embodiment, after the material is obtained, the steel strand is further processed as follows. The specific added processes are as follows:

[0064] The step S1-1 also includes: S1-1, drawing treatment, putting the steel strand into the drawing equipment, the drawing equipment adopts nine-pass drawing, the drawing speed is controlled at 3.4-3.8m / s, and the compression rate of each pass is controlled at more than 15%. By performing the nine-pass drawing process on the transported steel strand material, the mechanical properties of the steel strand are effectively improved, and the structure of the steel strand is made more uniform and dense. Specifically, the nine-pass drawing process can refine the grain structure of the steel strand and improve the tensile strength and elongation of the steel strand. The step S1-1 also includes: surface treatment, putting the steel strand into surface treatment equipment such as pickling and phosphating for treatment, and putting the treated steel strand into drawing equipment, so as to remove impurities on the surface of the steel strand by pickling, improve the surface cleanliness, and provide a good base for subsequent treatment. At the same time, phosphating combines with the steel strand to form a dense phosphate conversion film, which enhances the anti-corrosion performance and prevents the steel wire from rusting in a humid and corrosive environment, thereby extending the service life of the steel strand. In addition, this layer of phosphate conversion film also has good lubricity, which can reduce the friction coefficient of the steel wire during the drawing process and improve the drawing efficiency.

[0065] Please refer to the instruction manual Figure 1 And the instruction manual Figure 3 The present invention provides a third embodiment of a hollow grouting mining anchor cable preparation process, the hollow grouting mining anchor cable preparation process comprising the following steps:

[0066] The third embodiment may be based on the first embodiment or the second embodiment. Specifically:

[0067] The process of the present invention also adds the following steps in step S1:

[0068] S1-2, first heat treatment, putting the steel strand into the first heat treatment equipment, the first heat treatment equipment includes an induction heating quenching process and a tempering process; the heating quenching temperature of the heating equipment is between 820-850℃, and the temperature is kept for 2-3s, and the tempering temperature is between 150-170℃, and cooled to room temperature; between the induction heating quenching process and the tempering process, there is also:

[0069] Carburizing treatment: the quenched steel strand is put into a carburizing treatment device for carburizing treatment. The carburizing treatment adopts a low-temperature carburizing process. The temperature of the low-temperature carburizing process is 450-500°C.

[0070] After the purchased steel strands are subjected to the first heat treatment, the subsequent processing steps are carried out. The strength and toughness of the steel strands are significantly improved through quenching, tempering and carburizing processes. In particular, the tensile strength of the steel strands can reach 2230MPa, and the maximum force of the hollow steel strands is greater than or equal to 512KN. Specifically:

[0071] The quenching treatment causes the internal structure of the steel to undergo austenite transformation, and uses a rapid cooling process to obtain structures with high hardness and strength such as martensite or bainite, thereby improving the overall bearing capacity of the anchor cable. The subsequent tempering treatment eliminates the internal stress and brittleness caused by quenching, while adjusting the organizational structure of the steel, maintaining or improving its toughness, so that the anchor cable has good comprehensive mechanical properties. At the same time, the low-temperature carburizing process is added to it to increase the carbon content on the surface of the steel, thereby improving its hardness and wear resistance, while maintaining the internal toughness and strength, reducing the risk of deformation and cracking of the material during heat treatment, and optimizing the overall organizational structure.

[0072] In summary, the hollow grouting mining anchor cable preparation process of the present invention can further optimize the structure and performance of the weld by performing a second heat treatment on the anchor cable after welding. By controlling the heat treatment temperature above 440°C, it can be ensured that the strength and toughness of the welded joint are optimally balanced. In addition, the second heat treatment also helps to eliminate the residual stress generated during the welding process, improve the overall stability and durability of the anchor cable, and ensure that the manufactured hollow grouting mining anchor cable has the best steel wire tensile strength and the maximum force of the hollow steel strand.

[0073] According to the hollow grouting mining anchor cable preparation process of the above embodiment, a hollow grouting mining anchor cable 1 is prepared. The drawings of the hollow grouting mining anchor cable 1 are shown in the attached figure of the specification. Figure 6 Specifically, the prepared hollow grouting mining anchor cable 1 has the following characteristics:

[0074] 1) The cable body has a hollow structure and comes with a grouting core tube. The reverse grouting method is used to effectively eliminate the possibility of voids, ensuring that the anchor blades are full of drilled holes. It also eliminates the need for special joints for exhaust pipes and grouting pipes, and there is no need to tie up grouting pipes and exhaust pipes on site or to seal grouting holes, greatly simplifying the construction process.

[0075] 2) The upper part of the cable body is a stirred resin drug roll end anchor, and the lower end is locked with an anchor. It can bear load immediately after installation and tensioning, which is very beneficial and necessary for the top rock layer with poor self-stabilization ability. In addition, after installation, it can bear load synchronously with the rigid anchor rod to form an overall support effect, which is very beneficial to ensure the support effect;

[0076] 3) Grouting can be arranged at a certain distance behind the head to inject the hollow grouting mining anchor cable 1 within a certain range at one time (but the distance behind the head should be strictly controlled, and too large a distance may affect the support effect);

[0077] 4) The cable body adopts an innovative structural design, which minimizes the rod diameter while ensuring the grouting diameter. The required installation aperture is small, achieving small aperture and large tonnage. The cable body structure itself meets the requirements of high-pressure grouting and can achieve anchor-grouting combination;

[0078] 5) By using high-pressure grouting, the slurry can gradually penetrate into the cracks inside the rock layer, anchoring the gravel rock cracks into a whole, forming a deep multi-directional overall anchoring.

[0079] Furthermore, the generated hollow grouting mining anchor cable 1 has the following main performance parameters:

[0080]

[0081] Table 1- Main performance parameters

[0082] For the hollow grouting mining anchor 1, the present application conducts a static load mechanical property test, and uses a tensile testing machine to test the mechanical properties of the hollow grouting mining anchor 1 prepared by the preparation process of the present application and a traditional 1860 grade anchor.

[0083] It should be noted that the static load test consists of all parts of the anchor and matching strands assembled;

[0084] When the static load test reaches the measured ultimate tensile force, it should be caused by the breakage of the steel strand rather than the damage of the anchor. After the test, the anchor components will have residual deformation, but there should be no cracks or damage visible to the naked eye.

[0085] After the anchor cable and anchor assembly has been subjected to 2 million cycles of load, the anchor cable and anchor will not suffer from fatigue failure, and the cross-sectional area of ​​the steel strand that suffers from fatigue failure in the clamping area of ​​the anchor cable and anchor will not exceed 5% of the total area of ​​the steel strand.

[0086] The test results are shown in Table 2 below:

[0087]

[0088] Table 2 - Anchor cable mechanical properties test results

[0089] As can be seen from Table 2, the diameter, structure, total elongation under maximum force of the steel strand and other indicators of the hollow grouting mining anchor cable of the present application and the traditional 1860 grade anchor cable are basically the same, while the maximum force of the hollow steel strand and the tensile strength of the steel strand of the two are quite different. Among them, the maximum force of the hollow steel strand of the hollow grouting mining anchor cable 1 of the present application can reach more than 512KN, and the tensile strength of the steel strand can reach more than 2230MPa. Compared with the traditional 1860 grade anchor cable, the hollow mining anchor cable of the present application has an increased load, which extends the service life of the tunnel support and has great promotion prospects.

[0090] Furthermore, the dynamic load mechanical properties of the hollow mining grouting anchor cable of the present application and the traditional 1860 grade anchor cable were tested by using a 30000J drop hammer impact testing machine to test the dynamic load mechanical properties of the hollow mining grouting anchor cable of the present application and the traditional 1860 grade anchor cable.

[0091] The length of the anchor cable sample is 3.5m. The breaking conditions of the two anchor cables under different impact energies are tested and the following data are obtained: Figure 4 The impact force-displacement curve of the 1860 grade anchor cable shown in the figure and Figure 5 The impact force-displacement curve of the hollow mining grouting anchor cable of the present application is shown.

[0092] from Figure 4 as well as Figure 5 Judging from the breakage situation, when part of the steel wires of the 1860 grade anchor cable break, the impact energy is much lower than that of the hollow mining grouting anchor cable of the present application. Therefore, the hollow mining grouting anchor cable of the present application can resist greater impact energy and has better impact resistance.

[0093] In summary, compared with the 1860 grade anchor cable, the hollow steel strand of the hollow mining grouting anchor cable of the present application has better maximum force and tensile strength of the steel strand, higher strength, and stronger impact resistance. It can greatly absorb the impact kinetic energy generated by the impact ground pressure in the tunnel and avoid impact instability and damage in the tunnel.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for preparing hollow grouting mining anchor cables, characterized in that: The following steps are involved: S1. Raw material preparation, obtaining hollow steel bars and steel strands as raw materials; S2. Cutting: according to the length and diameter of the anchor cable required by the design, the raw materials are cut by cutting equipment to obtain steel strands and hollow steel bars of the same length; S3. Welding, installing a joint seat at one end of the hollow steel bar, and welding one end of the steel strand to the joint seat, and the number of steel strands is multiple, and obtaining the anchor cable after welding; S4. The second heat treatment is to put the steel strands of the anchor cable after welding into the heat treatment equipment; S5. Grinding: Grinding the anchor cable after heat treatment to remove the oxide scale and burrs on the anchor cable after heat treatment; S6. Weaving, spirally tightening a plurality of steel strands located outside the hollow steel bar to obtain a woven anchor cable; S7. Tighten: tighten the braided steel strands.

2. The hollow grouting mining anchor preparation process according to claim 1 is characterized in that: The step S4 further comprises: The welded portion of the anchor cable after welding is put into a second heat treatment device, and the heat treatment temperature is controlled to be above 440°C.

3. The hollow grouting mining anchor preparation process according to claim 2 is characterized in that: The step S4 further comprises: The heat treatment line speed is 15m / min, and the lay length of the steel strand is 600mm.

4. The hollow grouting mining anchor preparation process according to claim 1 is characterized in that: The step S1 further comprises: S1-1, drawing treatment, putting the steel strand into the drawing equipment, the drawing equipment adopts nine-pass drawing, the drawing speed is controlled at 3.4-3.8m / s, and the compression rate of each pass is controlled at more than 15%.

5. The hollow grouting mining anchor preparation process according to claim 4 is characterized in that: The step S1-1 further includes: Surface treatment: the steel strands are put into pickling, phosphating and other surface treatment equipment for treatment, and the treated steel strands are put into drawing equipment.

6. The hollow grouting mining anchor cable preparation process according to claim 1 is characterized in that: The step S1 further comprises: S1-2, the first heat treatment, putting the steel strand into the first heat treatment equipment, wherein the first heat treatment equipment includes an induction heating quenching process and a tempering process.

7. The hollow grouting mining anchor cable preparation process according to claim 6 is characterized in that: The heating quenching temperature of the heating equipment is between 820-850°C, and the temperature is kept for 2-3s. The tempering temperature is between 150-170°C, and the temperature is cooled to room temperature.

8. The process for preparing the hollow grouting mining anchor cable according to claim 7, characterized in that: The induction heating quenching process and the tempering process are also provided with: Carburizing treatment: putting the quenched steel strand into a carburizing treatment device for carburizing treatment, and the carburizing treatment adopts a low-temperature carburizing process.

9. The process for preparing the hollow grouting mining anchor cable according to claim 8, characterized in that: The temperature of the low temperature carburizing process is 450-500°C.

10. Hollow grouting mining anchor cable, characterized by: The hollow grouting mining anchor cable is applied with the hollow grouting mining anchor cable preparation process as described in any one of claims 1 to 9.

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