Steel strand joint forming machine and operation method

Abstract

The embodiment of the invention discloses a steel strand connector forming machine and an operation method. According to one specific implementation mode of the steel strand connector forming machine, a special rollback assembly is arranged to achieve rollback after a steel pipe is extruded, a pushing assembly, a necking assembly and the rollback assembly are assembled into a whole through a screw, and the steel strand connector forming machine is used for connection operation of steel pipes and steel strands of various lengths through continuous adjustment of the relative positions of all the assemblies. A hydraulic hollow jack is adopted to form a channel penetrating through the length direction in the middle of a steel strand joint forming machine to extrude a steel pipe at any position in the middle of a steel strand. Through component optimization, operation method improvement and contact information optimization, the effects that the same machine is adopted for connecting the steel pipes and the steel strands of different lengths, and connecting operation is conducted at any position of the steel strands are achieved, the application range is wide, and the comprehensive use cost is low.

Description

Technical Field

[0001] The invention belongs to the field of building technology, and relates to steel strand connection processing equipment, in particular to a steel strand joint forming machine and an operating method. Background Art

[0002] Pressing a steel pipe at the end of a steel strand can be used to connect the steel strand to the steel bar. Currently, a press is generally used to mesh the steel pipe with the steel strand by applying pressure at the end of the steel strand. However, the existing equipment has the following technical problems:

[0003] First, the crimping machine can only crimp the steel pipe along the circumferential direction of the steel pipe. The steel strand is made of multiple strands of steel wire. Under the circumferential pressure of the crimping machine, the cross-sectional shape of the steel strand will change, and it cannot be fully meshed with the steel pipe, resulting in insufficient connection strength.

[0004] Second, the extruder can extrude the steel pipe along the length direction of the steel pipe, but it can only extrude in one direction along the length direction of the steel pipe. It is impossible to stop the extrusion and withdraw the steel pipe in the middle of the extrusion, and the forced withdrawal is easy to damage the mold. Moreover, the steel pipe can only be extruded at the end of the steel strand, and it is impossible to extrude the steel pipe in the middle of the steel strand at the same time;

[0005] Third, the existing extruder has limited operating space and cannot be used for steel pipes of various lengths, and the equipment cannot be adjusted according to the length of the steel pipe;

[0006] Fourth, existing equipment manually performs visual quality inspection on the meshing quality of steel pipes and steel strands. The quality inspection is greatly affected by the experience of personnel and the reliability of the quality inspection results is low.

[0007] The above information disclosed in this Background section is only for enhancement of understanding of the background of the inventive concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the invention

[0008] The content of this disclosure is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0009] Some embodiments of the present disclosure propose a steel strand joint forming machine and an operating method to solve one or more of the technical problems mentioned in the above background technology section.

[0010] In the first aspect, some embodiments of the present disclosure provide a steel strand joint forming machine for processing joints at the ends and the middle of steel strands, wherein the steel strand joint forming machine includes a pushing assembly, a necking assembly, a retraction assembly and a connecting guide rail, the connecting guide rail is composed of four screws, and the pushing assembly, the necking assembly and the retraction assembly are connected in series as a whole through the connecting guide rail in sequence; the pushing assembly is composed of a pushing rod, a pushing hydraulic jack and a pushing fixed steel plate, and the pushing hydraulic jack adopts a hydraulic hollow jack; the necking assembly is equipped with a necking mold capable of reducing the steel pipe along the diameter direction, the necking mold is installed between the necking mold fixed steel plate and the necking mold front clamping steel plate, and the necking mold fixed steel plate is fixed to the connecting guide rail by a fastening nut; the retraction assembly is equipped with a retraction rod capable of moving toward the necking mold under the action of external force, and the retraction rod is made of a hollow steel pipe.

[0011] In some embodiments, the retraction rod is fixed on a retraction fixing steel plate, and the retraction fixing steel plate drives the retraction rod to move toward the necking mold under the action of external force. A limiting member that can prevent the retraction rod from hitting the necking mold is arranged on the connecting guide rail.

[0012] In some embodiments, the retraction rod is fixed on the retraction hydraulic top, the retraction hydraulic top adopts a hydraulic hollow jack, the retraction hydraulic top is installed on the retraction fixed steel plate through threaded cooperation, and the retraction rod moves toward the necking mold under the action of the retraction hydraulic top.

[0013] Specifically, the push rod is installed at one end of the push hydraulic jack close to the necking assembly through a push rod mounting sleeve. A through hole with a diameter of 23 to 30 mm is opened along the length direction of the push rod. Driven by the hydraulic pressure of the push hydraulic jack, the push rod pushes the steel pipe through the necking mold toward the retraction assembly. The push fixing steel plate is installed on the connecting guide rail through a fastening nut.

[0014] In particular, a necking mold fixing steel plate limiting countersunk hole matching the outer diameter of the necking mold is arranged at the center of the necking mold fixing steel plate, the necking mold is placed in the necking mold fixing steel plate limiting countersunk hole, the necking mold front clamping steel plate is installed on the necking mold fixing steel plate through four necking mold fastening screws, and the necking mold fixing steel plate is installed on the connecting guide rail through a fastening nut.

[0015] Specifically, a circular hole of the front clamping steel plate of the necking mold is arranged in the center thereof, the diameter of the circular hole of the front clamping steel plate of the necking mold is between the inner diameter and the outer diameter of the necking mold, and the diameter of the small hole of the limiting countersunk hole of the fixed steel plate of the necking mold is between the inner diameter and the outer diameter of the necking mold.

[0016] In a second aspect, some embodiments of the present disclosure provide an operating method of a steel strand joint forming machine, comprising:

[0017] Pass the steel strand through the retraction rod and the necking die in sequence, install the steel pipe on the side of the necking die close to the jacking assembly, and extend the end of the steel strand into the steel pipe to the set length; start the jacking hydraulic jack, and the jacking rod drives the steel pipe through the necking die toward the retraction assembly under the hydraulic pressure of the jacking hydraulic jack, and the steel pipe is engaged and connected with the steel strand after being reduced in diameter; when the end of the steel strand in the steel pipe is completely engaged with the steel pipe, close the jacking hydraulic jack, and the jacking rod retracts in the direction of the jacking hydraulic jack; start the retraction assembly, and the retraction rod moves toward the necking die and contacts the steel pipe. Driven by the retraction rod, the steel pipe moves toward the jacking assembly until the steel pipe completely exits the necking die and the retraction assembly is closed; take out the steel pipe and steel strand to complete the forming of the steel strand joint.

[0018] In some embodiments, starting the retraction component includes: manually pushing the retraction fixed steel plate to move toward the necking mold, and the retraction rod hits the steel pipe driven by the retraction fixed steel plate; or starting the retraction hydraulic jack, and the retraction rod moves toward the necking mold under the action of the retraction hydraulic jack.

[0019] Specifically, in some embodiments, the length is set to 3.0-5.0 times the outer diameter of the steel strand.

[0020] Some other embodiments of the present disclosure also provide an operating method of a steel strand joint forming machine, comprising:

[0021] Remove the retraction component; install the steel pipe on the side of the necking die close to the jacking component; pass the steel strand through the necking die, steel pipe, jacking rod and jacking hydraulic jack in sequence; start the jacking hydraulic jack, and the jacking rod drives the steel pipe through the necking die toward the retraction component under the hydraulic pressure of the jacking hydraulic jack, and the steel pipe is engaged and connected with the steel strand after being reduced in diameter; after the steel pipe completely passes through the necking die, close the jacking hydraulic jack; take out the steel pipe and steel strand in the direction away from the jacking component to complete the forming of the steel strand joint.

[0022] The above-mentioned embodiments of the present disclosure have the following beneficial effects:

[0023] First, the steel strand joint forming machine disclosed in the present invention can extrude the steel pipe along the length direction of the steel pipe to engage the steel pipe with the steel strand, thereby ensuring the bonding strength between the steel pipe and the steel strand.

[0024] Second, the steel strand joint forming machine disclosed in the present invention can stop and withdraw the steel pipe in the middle of steel pipe extrusion, and at the same time, it can extrude the steel pipe in the middle of the steel strand by disassembling the components, so that one machine can combine with the steel pipe at the end and middle of the steel strand at the same time.

[0025] Third, the relative position relationship of each component of the steel strand joint forming machine disclosed in the present invention can be continuously adjusted, and the operating space can be adjusted according to needs. It can be applied to the connection operations of steel pipes and steel strands of various lengths. It has a wide range of applications and low comprehensive use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0027] Figure 1 It is a schematic structural diagram of some embodiments of the steel strand joint forming machine according to the present disclosure, wherein the retraction component is driven by artificial external force.

[0028] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle push assembly.

[0029] Figure 3 yes Figure 2 Schematic diagram of the disassembly of the middle push assembly.

[0030] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure of the mid-necked component.

[0031] Figure 5 yes Figure 4 Schematic diagram of the disassembly of the middle necking assembly.

[0032] Figure 6 yes Figure 1 Schematic diagram of the three-dimensional structure of the fallback component.

[0033] Figure 7 yes Figure 6 Schematic diagram of the disassembly of the fallback component.

[0034] Figure 8 It is a schematic diagram of the structure of some embodiments of the steel strand joint forming machine according to the present disclosure, wherein the retraction component is hydraulically driven.

[0035] Fig. 9 yes Figure 8 Schematic diagram of the three-dimensional structure of the fallback component.

[0036] Fig.10 yes Fig. 9 Schematic diagram of the disassembly of the fallback component.

[0037] Fig.11 is a flow chart of some embodiments of the operating method of the steel strand joint forming machine according to the present disclosure, which is used to process joints at the ends of steel strands.

[0038] Fig.12 It is a schematic diagram of the structure of the steel strand end extending into the steel pipe during the process of processing the joint at the steel strand end, in which the steel pipe is cut away and shown.

[0039] Fig.13 It is a flow chart of some embodiments of the operation method of the steel strand joint forming machine according to the present disclosure, which is used to process a joint in the middle of a steel strand.

[0040] Fig.14 It is a schematic diagram of the state structure of the steel strand joint forming machine during the process of processing the joint in the middle part of the steel strand. DETAILED DESCRIPTION

[0041] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0042] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0043] It should be noted that the “bottom”, “top”, “upper”, “lower” and “top surface” mentioned in the present disclosure are based on the orientation or position relationship in which the disclosure is usually placed during normal use, and the above terms are limitations on the present disclosure.

[0044] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0045] The present invention provides a steel strand joint forming machine, which is used for processing joints at the end and middle of a steel strand 5, wherein the steel strand joint forming machine includes a pushing assembly 1, a necking assembly 2, a retraction assembly 3 and a connecting guide rail 4, wherein the connecting guide rail 4 is composed of four screws, and the pushing assembly 1, the necking assembly 2, and the retraction assembly 3 are connected in series as a whole through the connecting guide rail 4 in sequence; the pushing assembly 1 is composed of a pushing rod 13, a pushing hydraulic jack 11 and a pushing fixed steel plate 12, and the pushing hydraulic jack 11 adopts a hydraulic hollow jack; the necking assembly 2 is provided with a necking mold 21 capable of reducing the diameter of a steel pipe 6, and the necking mold 21 is installed between a necking mold fixed steel plate 22 and a necking mold front clamping steel plate 23, and the necking mold fixed steel plate 22 is fixed on the connecting guide rail 4 by a fastening nut 7; the retraction assembly 3 is provided with a retraction rod 32 capable of moving toward the necking mold 21 under the action of an external force, and the retraction rod 32 is made of a hollow steel pipe.

[0046] refer to Figure 1-Figure 7 , shows a schematic diagram of the structure of some embodiments of the steel strand joint forming machine according to the present disclosure, wherein the retracting component 3 is driven by artificial external force. Figure 1As shown, the steel strand joint forming machine includes a pushing assembly 1, a necking assembly 2, a retracting assembly 3 and a connecting guide rail 4. The connecting guide rail 4 is composed of four screws with a screw diameter of 30 to 50 mm. The pushing assembly 1, the necking assembly 2 and the retracting assembly 3 are sequentially connected in series as a whole through the connecting guide rail 4. The pushing assembly 1 and the necking assembly 2 are fixed to the connecting guide rail 4 by fastening nuts 7. The relative positions of the pushing assembly 1 and the necking assembly 2 can be adjusted as needed. The above-mentioned related content serves as an inventive point of the present disclosure, thereby solving the third technical problem mentioned in the background technology. The reasons for the above-mentioned technical problems are as follows: The relative positions of the functional modules of the existing extruder are fixed, and they cannot be adjusted according to personalized needs during use, which limits the operating space and scope of application. The present invention adopts a screw rod as a connecting guide rail to integrate various functional components into a whole. The position of each functional component can be continuously adjusted on the screw rod and fixed with a tightening nut after being adjusted into place. The relative position relationship of each functional component can be continuously adjusted according to needs. It can be applicable to the connection operation of steel pipes and steel strands of various lengths. It has a wide range of applications, and one machine can be used to meet various operation needs. The comprehensive use cost is low.

[0047] refer to Figure 1-Figure 3 The push assembly 1 is composed of a push rod 13, a push hydraulic jack 11 and a push fixed steel plate 12. The push hydraulic jack 11 adopts a hydraulic hollow jack. The push rod 13 is installed at one end of the push hydraulic jack 11 close to the necking assembly 2 through a push rod mounting sleeve 14. Specifically, refer to Figure 3 The end of the push rod 13 near the push hydraulic jack 11 is provided with a push rod external thread 131. The push rod mounting sleeve 14 is a hollow steel part, with a push rod mounting sleeve external thread 141 processed on the surface and a push rod mounting sleeve internal thread 142 processed on the inside. The inner wall of the oil cylinder of the push hydraulic jack 11 is processed with a push hydraulic jack internal thread 112. The push rod 13 and the push hydraulic jack 11 are assembled and connected through the threaded connection of the push rod mounting sleeve 14. The push rod 13 is a vulnerable part. Only the push rod 13 needs to be replaced during use, which reduces the cost of use. Figure 1 , Figure 3 , the four corners of the pushing and fixing steel plate 12 are provided with pushing and fixing steel plate guide rail holes 121 corresponding to the connecting guide rail 4, and the connecting guide rail 4 passes through the pushing and fixing steel plate guide rail holes 121. A fastening nut 7 is arranged on both sides of the pushing and fixing steel plate 12 of each connecting guide rail 4 to fix the pushing and fixing steel plate 12 on the connecting guide rail 4. At the same time, a through hole matching the pushing hydraulic jack 11 is opened in the center of the pushing and fixing steel plate 12, and the inner wall of the through hole is processed with a pushing and fixing steel plate internal thread 122. The outer surface of the pushing hydraulic jack 11 close to the pushing and fixing steel plate 12 is processed with a pushing hydraulic jack external thread 111. The pushing hydraulic jack 11 and the pushing and fixing steel plate 12 are assembled and connected through the thread matching of the pushing hydraulic jack external thread 111 and the pushing and fixing steel plate internal thread 122. Reference Figure 2The push rod 13 is provided with a through hole with a diameter of 23 to 30 mm along the length direction, which can meet the requirements of common specifications of steel strands with diameters of 15.2, 17.8 and 21.6 mm passing through the push rod 13. Figure 1 , the push rod 13 is driven by the hydraulic pressure of the push hydraulic jack 11 to push the steel pipe 6 toward the retracting component 3 through the necking die 21. In order to ensure that the push rod 13 can effectively push the steel pipe 6 to effectively combine with the steel strands with diameters of 15.2, 17.8 and 21.6 mm, the rated thrust of the push hydraulic jack 11 can be selected as 100 tons.

[0048] refer to Figure 4 , Figure 5 The necking assembly 2 is provided with a necking die 21 capable of reducing the steel pipe 6 in the diameter direction. The necking die 21 is installed between a necking die fixed steel plate 22 and a necking die front clamping steel plate 23. Specifically, a necking die fixed steel plate limiting countersunk hole 222 matching the outer diameter of the necking die 21 is provided at the center of the necking die fixed steel plate 22. The necking die 21 is placed in the necking die fixed steel plate limiting countersunk hole 222. Through holes are provided at the four corners of the necking die front clamping steel plate 23. Four necking die fastening screws 231 pass through the necking die. The front clamping steel plate 23 of the shrinking mold has through holes at the corners and the fastening holes 223 of the necking mold fixed steel plate. The front clamping steel plate 23 of the necking mold is pulled and fixed on the necking mold fixed steel plate 22. The four corners of the necking mold fixed steel plate 22 are provided with necking mold fixed steel plate guide rail holes 221 corresponding to the connecting guide rails 4. The connecting guide rails 4 pass through the necking mold fixed steel plate guide rail holes 221. A fastening nut 7 is arranged on both sides of the necking mold fixed steel plate 22 of each connecting guide rail 4 to fix the necking mold fixed steel plate 22 on the connecting guide rail 4. Figure 5 A circular hole 232 of the front clamping steel plate of the necking mold is arranged at the center of the front clamping steel plate 23 of the necking mold. The diameter of the circular hole 232 of the front clamping steel plate of the necking mold is between the inner diameter and the outer diameter of the necking mold 21. The diameter of the small hole of the limiting countersunk hole 222 of the fixed steel plate of the necking mold is between the inner diameter and the outer diameter of the necking mold 21. Through the above structure, the necking mold 21 is installed between the fixed steel plate 22 of the necking mold and the front clamping steel plate 23 of the necking mold to ensure that the necking mold 21 does not move under the action of external forces in two directions.

[0049] refer to Figure 1 , Figure 6 , Figure 7The retraction component 3 is provided with a retraction rod 32 which can move toward the necking mold 21 under the action of external force. The retraction rod 32 is made of a hollow steel pipe. The retraction rod 32 is fixed on the retraction fixing steel plate 31. The fixing method can be welding. The retraction fixing steel plate 31 has a retraction fixing steel plate through hole 312 corresponding to the position of the retraction rod 32, so that the steel strand 5 can pass through the retraction component 3; the four corners of the retraction fixing steel plate 31 are provided with retraction fixing steel plate guide rail holes 311 corresponding to the connecting guide rail 4, and the connecting guide rail 4 passes through the retraction fixing steel plate guide rail holes 311. The retraction fixing steel plate 31 drives the retraction rod 32 to move toward the necking mold 21 under the action of artificial external force. After the extrusion is completed, the pile foundation steel pipe 6 is retracted. A nut is arranged on the connecting guide rail 4 between the necking component 2 and the retraction fixing steel plate 31 as a limiter 8 to prevent the retraction rod 32 from hitting the necking mold 21 and causing damage to the necking mold 21.

[0050] The above-mentioned related contents are an invention point of the present disclosure, thereby solving the technical problems 1 and 2 mentioned in the background technology. The reasons for the above-mentioned technical problems are as follows: the steel strand is twisted from multiple strands of steel wire. Under the action of circumferential pressure, the cross-sectional shape of the steel strand will change and cannot fully engage with the steel pipe. The existing extruder can only unidirectionally extrude along the length direction of the steel pipe until the steel pipe is completely pushed out of the mold before the connection can be achieved. It is impossible to stop the jacking in the middle of the steel pipe and push the steel pipe in the opposite direction of the jacking. It is easy to damage the mold by forcing it to retreat by hammering, etc., and the jacking hydraulic jack used is a hydraulic solid jack, which cannot extrude the steel pipe at the end and the middle of the steel strand at the same time. The present disclosure adopts the method of extrusion along the length direction of the steel pipe to avoid the problem of insufficient connection strength, and is equipped with a special retraction component, and the retraction component moves along the fixed track of the connecting guide rail. Combined with the limit, it can effectively avoid collision with the mold during the retraction operation. The jacking hydraulic jack adopts a hydraulic hollow jack to form a channel running through the length direction on the central axis of the steel strand joint forming machine, so that the steel pipe can be squeezed at any position in the middle of the steel strand.

[0051] refer to Figure 8 to Figure 10 , showing a schematic diagram of the structure of some embodiments of the steel strand joint forming machine according to the present disclosure, compared with Figure 1 to Figure 7The retraction component 3 is hydraulically driven. The retraction component 3 is equipped with a retraction rod 32 that can move toward the necking mold 21 under the action of external force. The retraction rod 32 is made of a hollow steel pipe. The retraction rod 32 is fixed on the retraction hydraulic top 33. The retraction hydraulic top 33 adopts a hydraulic hollow jack. Specifically, the end of the retraction rod 32 close to the retraction hydraulic top 33 is processed with a thread on the surface. The retraction rod mounting sleeve 34 is a hollow steel part. The surface is processed with a retraction rod mounting sleeve external thread 341, and the interior is processed with a retraction rod mounting sleeve internal thread 342. The inner wall of the cylinder of the retraction hydraulic top 33 is processed with a retraction hydraulic top internal thread 332. The retraction rod 32 and the retraction hydraulic top 33 are assembled and connected through the threaded conversion of the retraction rod mounting sleeve 34. The retraction rod 32 is a wearing part. Only the retraction rod 32 needs to be replaced during use, thereby reducing the cost of use.

[0052] refer to Figure 8 to Figure 10 The four corners of the retracting fixed steel plate 31 are provided with retracting fixed steel plate guide rail holes 311 corresponding to the connecting guide rail 4. The connecting guide rail 4 passes through the retracting fixed steel plate guide rail holes 311. A fastening nut 7 is arranged on both sides of the retracting fixed steel plate 31 of each connecting guide rail 4 to fix the retracting fixed steel plate 31 on the connecting guide rail 4. At the same time, a through hole matching the retracting hydraulic top 33 is opened in the center of the retracting fixed steel plate 31. The inner wall of the through hole is processed with a retracting fixed steel plate internal thread 313. The outer surface of the retracting hydraulic top 33 close to the retracting fixed steel plate 31 is processed with a retracting hydraulic top external thread 331. The retracting hydraulic top 33 is installed on the retracting fixed steel plate 31 through the thread matching of the retracting hydraulic top external thread 331 and the retracting fixed steel plate internal thread 313. Reference Figure 8 When the retraction hydraulic jack 33 is started, the retraction rod 32 moves toward the necking mold 21 under the hydraulic pressure of the retraction hydraulic jack 33, and the retraction rod 32 pushes the steel pipe 6 to withdraw the steel pipe 6 from the necking mold 21 toward the push assembly 1. In order to ensure that the retraction rod 32 can effectively push the steel pipe 6 to withdraw from the necking mold 21, the rated thrust of the retraction hydraulic jack 33 can be selected as 30 tons.

[0053] Please refer to Fig.11 , shows a process 100 of some embodiments of the method of operating a steel strand joint forming machine according to the present disclosure, for processing a joint at the end of a steel strand, comprising the following steps:

[0054] Step 101, pass the steel strand through the retraction rod and the necking mold in sequence, install the steel pipe on the side of the necking mold close to the jacking assembly, and extend the end of the steel strand into the steel pipe to reach a set length.

[0055] In some embodiments, reference Figure 1 or Figure 8, adjust the push assembly 1, the necking assembly 2, and the retracting assembly 3 to the corresponding positions according to the length of the steel pipe 6 and the diameter of the steel strand 5, pass the steel strand 5 through the retracting rod 32 and the necking mold 21 in sequence, install the steel pipe 6 on the side of the necking mold 21 close to the push assembly 1, and the end of the steel strand 5 extends into the steel pipe 6 to reach the set length, providing a basis for the next extrusion operation. The combined length of the steel strand 5 and the steel pipe 6 is the key to ensuring the connection strength. In some embodiments, reference Fig.12 The set length that the end of the steel strand 5 extends into the steel pipe 6 is 3.0-5.0 times the outer diameter of the steel strand 5.

[0056] Step 102, start the jacking hydraulic jacking, and the jacking rod is driven by the hydraulic pressure of the jacking hydraulic cylinder to push the steel pipe through the necking die toward the retracting component. The steel pipe is reduced in diameter and then engaged with the steel strand.

[0057] In some embodiments, after the steel pipe and steel strand are installed in place, the pushing hydraulic jack is started, and the pushing hydraulic jack pushes the pushing rod to move toward the necking assembly. After the pushing rod contacts the steel pipe, it pushes the steel pipe through the necking mold toward the retraction assembly. The inner diameter of the necking mold is smaller than the outer diameter of the steel pipe. During the process of passing through the necking mold, the steel pipe is reduced in diameter and engages with the steel strand to achieve the connection between the steel pipe and the steel strand.

[0058] Step 103, when the end of the steel strand in the steel pipe is completely engaged with the steel pipe, the hydraulic jack is closed, and the jacking rod is withdrawn in the direction of the hydraulic jack.

[0059] In some embodiments, when the end of the steel strand inside the steel pipe is completely engaged with the steel pipe, that is, the engagement connection between the steel strand of a set length and the steel pipe reaches the connection strength requirement, the jacking hydraulic jack is closed to stop the jacking, and the jacking rod is driven to retreat in the direction of the jacking hydraulic jack during the oil return process of the jacking hydraulic jack.

[0060] During the execution of step 103, in some embodiments, visual inspection technology is used to inspect the bite quality of the steel pipe and the steel strand. Optionally, a state image of the steel pipe in the necking assembly is obtained during the process of the jacking rod pushing the steel pipe. In practice, a camera can be deployed on the jacking fixed steel plate to continuously obtain the state image of the steel pipe in the necking assembly during the process of the jacking rod pushing the steel pipe.

[0061] Optionally, the above-mentioned image is input into a trained steel pipe and steel strand bite quality recognition model to obtain a steel pipe and steel strand bite quality image recognition result.

[0062] In some embodiments, the execution subject of the operation method of the steel strand joint forming machine can input the above image into a trained steel pipe and steel strand bite quality recognition model to obtain the steel pipe and steel strand bite quality image recognition result. Among them, the above-mentioned trained steel pipe and steel strand bite quality recognition model includes a steel pipe and steel strand bite length detection model and a steel pipe surface crack recognition model; the above-mentioned steel pipe and steel strand bite quality image recognition result includes a steel pipe and steel strand bite length detection result and a steel pipe surface crack recognition result. The steel pipe and steel strand bite length detection model can be a neural network model that takes the state image of the steel pipe in the necking component as input and takes the information characterizing the bite length of the steel pipe and the steel strand as output. For example, the steel pipe and steel strand bite length detection model can be a trained convolutional neural network model. The steel pipe surface crack recognition model can be a neural network model that takes the state image of the steel pipe in the necking component as input and takes the information characterizing whether there are cracks on the surface of the steel pipe as output. For example, the steel pipe surface crack recognition model can be a trained convolutional neural network model.

[0063] In practice, the above steel pipe and steel strand bite length detection model is trained through the following steps:

[0064] The first step is to obtain a first training sample set, wherein the training samples in the first training sample set include: state sample images of the steel pipe in the necking component and sample bite length information.

[0065] In some embodiments, the execution subject may obtain the first training sample set from the terminal device by wireless transmission. The training samples in the first training sample set include: a sample image of the state of the steel pipe in the necking assembly and sample bite length information. The sample bite length information may characterize the bite length between the steel pipe and the steel strand. For example, the sample bite length information may be 70, 90 or other numbers, indicating that the bite length between the steel pipe and the steel strand is 70 mm, 90 mm or other sizes.

[0066] In the second step, based on the first training sample set, the following processing steps are performed:

[0067] In the first sub-step, the state sample images of the steel pipe in the necking assembly included in at least one training sample in the above-mentioned first training sample set are respectively input into the initial steel pipe and steel strand bite length detection model to obtain the bite length information corresponding to each training sample in the at least one training sample.

[0068] In some embodiments, the execution subject may input the state sample images of the steel pipe in the necking assembly included in at least one training sample in the first training sample set into the initial steel pipe and steel strand bite length detection model to obtain the bite length information corresponding to each training sample in the at least one training sample. Here, the initial steel pipe and steel strand bite length detection model may be Yolov5, VGG19 or other image recognition models.

[0069] The second sub-step is to compare the bite length information corresponding to each training sample in the at least one training sample with the corresponding sample bite length information.

[0070] In some embodiments, the execution subject may compare the bite length information corresponding to each training sample in the at least one training sample with the corresponding sample bite length information. For example, the bite length information corresponding to each training sample is subtracted from the corresponding sample bite length information, and then the absolute value of the difference is taken.

[0071] The third sub-step is to determine whether the initial steel pipe and steel strand bite length detection model has achieved a preset optimization target based on the comparison result.

[0072] In some embodiments, the execution subject can determine whether the initial steel pipe and steel strand bite length detection model has achieved the preset optimization target based on the comparison result. The comparison result refers to the comprehensive comparison result obtained by comparing the bite length information corresponding to each training sample in at least one training sample with the corresponding sample bite length information. For example, the bite length information corresponding to each training sample is subtracted from the corresponding sample bite length information, and then the absolute value of the difference is taken as the comparison result between the bite length information corresponding to each training sample and the corresponding sample bite length information, and then the average of all comparison results is taken as the comprehensive comparison result. The preset optimization target refers to the comparison result being less than a preset threshold. The preset threshold is a preset fixed value, for example, the preset threshold can be 5, 1 or other fixed values. In practice, when the comparison result is less than the preset threshold, it indicates that the initial steel pipe and steel strand bite length detection model has achieved the preset optimization target, and when the comparison result is greater than or equal to the preset threshold, it indicates that the initial steel pipe and steel strand bite length detection model has not achieved the preset optimization target.

[0073] In a fourth sub-step, in response to determining that the initial steel pipe and steel strand bite length detection model achieves the above-mentioned optimization goal, the initial steel pipe and steel strand bite length detection model is used as the trained steel pipe and steel strand bite length detection model.

[0074] In some embodiments, the execution subject may, in response to determining that the initial steel pipe and steel strand bite length detection model has achieved the above optimization goal, use the initial steel pipe and steel strand bite length detection model as the trained steel pipe and steel strand bite length detection model. In practice, when the comparison result in the third sub-step is less than a preset threshold, it indicates that the initial steel pipe and steel strand bite length detection model has achieved the preset optimization goal, and thus it can be considered that the initial steel pipe and steel strand bite length detection model has been trained.

[0075] Optionally, in response to determining that the initial steel pipe and steel strand bite length detection model does not achieve the above-mentioned optimization goal, the model parameters of the initial steel pipe and steel strand bite length detection model are adjusted, and unused training samples are used to form a training sample set, and the adjusted initial steel pipe and steel strand bite length detection model is used as the initial steel pipe and steel strand bite length detection model, and the above-mentioned processing steps are performed again.

[0076] In some embodiments, the execution subject may adjust the model parameters of the initial steel pipe and steel strand bite length detection model in response to determining that the initial steel pipe and steel strand bite length detection model has not achieved the above optimization goal, and use unused training samples to form a training sample set, and use the adjusted initial steel pipe and steel strand bite length detection model as the initial steel pipe and steel strand bite length detection model to perform the above processing steps again. In practice, when the comparison result in the third sub-step is greater than or equal to a preset threshold, indicating that the initial steel pipe and steel strand bite length detection model has not achieved the preset optimization goal, it can be considered that the initial steel pipe and steel strand bite length detection model has not been trained. At this time, the back propagation algorithm or the gradient descent method can be used to adjust the model parameters of the initial steel pipe and steel strand bite length detection model. Then, the initial steel pipe and steel strand bite length detection model after adjusting the model parameters is used as the initial steel pipe and steel strand bite length detection model, and unused training samples are used to form a training sample set, and the above processing steps are performed again until the initial steel pipe and steel strand bite length detection model reaches the above optimization goal.

[0077] In practice, the above steel pipe surface crack recognition model is trained through the following steps:

[0078] The first step is to obtain a second training sample set, wherein the training samples in the second training sample set include: state sample images of the steel pipe in the necking component and sample crack information.

[0079] In some embodiments, the execution subject may obtain the second training sample set from the terminal device by wireless transmission. The training samples in the second training sample set include: a sample image of the state of the steel pipe in the necking assembly and sample crack information. The sample crack information may indicate whether there are cracks on the surface of the steel pipe. For example, the number 1 indicates cracks, and the number 0 indicates no cracks.

[0080] In the second step, based on the second training sample set, the following processing steps are performed:

[0081] In the first sub-step, the state sample images of the steel pipe in the necking assembly included in at least one training sample in the above-mentioned second training sample set are respectively input into the initial steel pipe surface crack recognition model to obtain the crack information corresponding to each training sample in the at least one training sample.

[0082] In some embodiments, the execution subject may input the state sample images of the steel pipe in the necking assembly included in at least one training sample in the second training sample set into the initial steel pipe surface crack recognition model to obtain crack information corresponding to each training sample in the at least one training sample. Here, the initial steel pipe surface crack recognition model may be Yolov5, VGG19 or other image recognition models.

[0083] The second sub-step is to compare the crack information corresponding to each training sample in the at least one training sample with the corresponding sample crack information.

[0084] In some embodiments, the execution entity may compare the crack information corresponding to each training sample in the at least one training sample with the corresponding sample crack information. For example, the crack information corresponding to each training sample is subtracted from the corresponding sample crack information, and then the absolute value of the difference is taken.

[0085] The third sub-step is to determine whether the initial steel pipe surface crack identification model has achieved a preset optimization target based on the comparison result.

[0086] In some embodiments, the execution subject can determine whether the initial steel pipe surface crack recognition model has achieved the preset optimization target based on the comparison result. The comparison result refers to the comprehensive comparison result obtained by comparing the crack information corresponding to each training sample in at least one training sample with the corresponding sample crack information. For example, the crack information corresponding to each training sample is subtracted from the corresponding sample crack information, and then the absolute value of the difference is taken as the comparison result between the crack information corresponding to each training sample and the corresponding sample crack information, and then the mean of all comparison results is taken as the comprehensive comparison result. The preset optimization target refers to the comparison result being less than a preset threshold. The preset threshold is a preset fixed value, for example, the preset threshold can be 0.01, 0.001 or other fixed values. In practice, when the comparison result is less than the preset threshold, it indicates that the initial steel pipe surface crack recognition model has achieved the preset optimization target, and when the comparison result is greater than or equal to the preset threshold, it indicates that the initial steel pipe surface crack recognition model has not achieved the preset optimization target.

[0087] In a fourth sub-step, in response to determining that the initial steel pipe surface crack recognition model achieves the above optimization goal, the initial steel pipe surface crack recognition model is used as the trained initial steel pipe surface crack recognition model.

[0088] In some embodiments, the execution subject may, in response to determining that the initial steel pipe surface crack recognition model has achieved the above-mentioned optimization target, use the initial steel pipe surface crack recognition model as the trained initial steel pipe surface crack recognition model. In practice, when the comparison result in the third sub-step is less than a preset threshold, it indicates that the initial steel pipe surface crack recognition model has achieved the preset optimization target, and thus the initial steel pipe surface crack recognition model can be considered to have been trained.

[0089] Optionally, in response to determining that the initial steel pipe surface crack recognition model does not achieve the above-mentioned optimization goal, the model parameters of the initial steel pipe surface crack recognition model are adjusted, and unused training samples are used to form a training sample set, and the adjusted initial steel pipe surface crack recognition model is used as the initial steel pipe surface crack recognition model, and the above-mentioned processing steps are performed again.

[0090] In some embodiments, the execution subject may adjust the model parameters of the initial steel pipe surface crack recognition model in response to determining that the initial steel pipe surface crack recognition model does not reach the above-mentioned optimization target, and use unused training samples to form a training sample set, and use the adjusted initial steel pipe surface crack recognition model as the initial steel pipe surface crack recognition model, and perform the above-mentioned processing steps again. In practice, when the comparison result in the third sub-step is greater than or equal to the preset threshold, it indicates that the initial steel pipe surface crack recognition model does not reach the preset optimization target, and it is considered that the initial steel pipe surface crack recognition model has not been trained. At this time, the model parameters of the initial steel pipe surface crack recognition model can be adjusted by using the back propagation algorithm or the gradient descent method. Then, the initial steel pipe surface crack recognition model after adjusting the model parameters is used as the initial steel pipe surface crack recognition model, and the training sample set is composed of unused training samples, and the above-mentioned processing steps are performed again until the initial steel pipe surface crack recognition model reaches the above-mentioned optimization target.

[0091] Optionally, in response to the steel pipe and steel strand bite quality image recognition result meeting the strength requirement of the steel pipe and steel pipe line bite connection, the steel strand joint is determined as a qualified steel strand joint, the jacking hydraulic jack is closed, and the jacking is stopped. Here, the strength requirement of the steel pipe and steel pipe line bite connection is a preset condition, including the bite length of the steel pipe and the steel strand, and whether there are cracks on the surface of the steel pipe (for example, the strength requirement of the steel pipe and steel pipe line bite connection is that the bite length of the steel pipe and the steel strand is 70mm-90mm, and there are no cracks on the surface of the steel pipe). If the steel pipe and steel strand bite quality image recognition result presets the strength requirement of the steel pipe and steel pipe line bite connection, the execution subject believes that the steel strand joint has reached the preset strength requirement, and thus the steel strand joint can be determined as a qualified steel strand joint, the jacking hydraulic jack is closed, and the jacking is stopped. In practice, the camera can be set to continuously capture images of the state of the steel pipe in the necking assembly during the pushing process by the pushing rod at certain time intervals, and the images can be input into the trained steel pipe and steel strand bite quality recognition model for recognition in real time. When it is detected that the steel pipe and steel strand bite quality image recognition results meet the strength requirements of the steel pipe and steel strand bite connection, the associated pushing hydraulic jack is controlled to stop pushing.

[0092] The above-mentioned related content is an inventive point of the present disclosure, thereby solving the technical problem 4 mentioned in the background technology. The reasons for the above-mentioned technical problems are as follows: manual inspection is greatly affected by personnel experience and has a large degree of subjectivity, resulting in low reliability of quality inspection results of the bite quality of steel pipes and steel pipe lines, and it is difficult to manually use a ruler to continuously and in real time detect the bite length of steel pipes and steel strands during the jacking process. The present disclosure uses visual recognition technology to detect the bite quality of steel pipes and steel pipe lines, and uses a steel pipe and steel strand bite quality recognition model trained with large-scale data to replace manual inspection. The entire quality inspection process can be achieved without manual interference, effectively avoiding the subjectivity of manual quality, and can greatly shorten the quality inspection time and cost. Continuous real-time detection can be achieved, and the detection results are linked to the jacking hydraulic jack in real time, and the jacking can be stopped immediately according to the detection results.

[0093] Step 104, start the retraction assembly, the retraction rod moves toward the necking die and contacts the steel pipe, and the steel pipe moves toward the push assembly under the drive of the retraction rod until the steel pipe completely exits the necking die and then closes the retraction assembly.

[0094] In some embodiments, the fallback component uses Figure 1 In the structure, the retracted fixed steel plate is manually pushed to move toward the necking mold, the retracted rod is driven by the retracted fixed steel plate to hit the steel pipe, and the steel pipe moves toward the push assembly under the drive of the retracted rod until the steel pipe completely exits the necking mold and stops pushing the retracted fixed steel plate. The limiter located on the connecting guide rail can prevent the retracted rod from directly hitting the necking mold; in some embodiments, the retracted assembly adopts Figure 8 The structure in the back-moving hydraulic jack is started, and the back-moving rod moves toward the necking die under the hydraulic action of the back-moving hydraulic jack. After the back-moving rod contacts the steel pipe, it pushes the steel pipe toward the pushing assembly until the steel pipe completely exits the necking die and then the back-moving hydraulic jack is closed. The back-moving hydraulic jack drives the back-moving rod back during the oil return process.

[0095] Step 105, taking out the steel pipe and the steel strand, and completing the forming of the steel strand joint.

[0096] In some embodiments, after the steel pipe completely exits the necking mold, the combined steel pipe and steel strand are taken out in the direction toward the jacking assembly to complete the joint forming at the end of the steel strand.

[0097] Please refer to Fig.13 , shows a process 200 of some embodiments of the operation method of the steel strand joint forming machine according to the present disclosure, which is used to process a joint in the middle of a steel strand, comprising the following steps:

[0098] Step 201, remove the rollback component.

[0099] There is no need to retract the steel pipe when processing the joint in the middle of the steel strand, and the steel strand end cannot effectively pass through the retracting component after processing the joint. In some embodiments, the retracting component of the steel strand joint forming machine is removed, such as Fig.14 As shown, during the process of processing the joint in the middle of the steel strand, the steel strand joint forming machine mainly includes a pushing component 1 and a necking component 2.

[0100] Step 202, installing the steel pipe on the side of the necking mold close to the ejection assembly;

[0101] As an example, Fig.14 As shown, the steel pipe 6 which is expected to be engaged in the middle of the steel strand is placed on the side of the necking die close to the jacking assembly 1 .

[0102] Step 203, passing the steel strand through the necking die, the steel pipe, the push rod and the push hydraulic jack in sequence.

[0103] As an example, Fig.14 As shown, after the steel pipe 6 is in place, the steel strand 5 is passed through the necking mold 21, the steel pipe 6, the push rod 13 and the push hydraulic jack 11 from one side of the necking assembly 2 in sequence until the steel pipe 6 is at the expected position of the steel strand 5.

[0104] Step 204, start the jacking hydraulic jack, and the jacking rod is driven by the hydraulic pressure of the jacking hydraulic jack to push the steel pipe through the necking die toward the retracting component, and the steel pipe is shrunken in the diameter direction and then engaged with the steel strand.

[0105] In some embodiments, Fig.14 As shown, after the steel pipe 6 and the steel strand 5 are installed in place, the hydraulic jack 11 is started. The hydraulic jack 11 pushes the push rod 13 to move toward the necking assembly 2. After the push rod 13 contacts the steel pipe 6, it pushes the steel pipe 6 through the necking die 21. The inner diameter of the necking die 21 is smaller than the outer diameter of the steel pipe 6. During the process of the steel pipe 6 passing through the necking die 21, it shrinks along the diameter direction and then engages with the steel strand 5, thereby realizing the engagement of the steel pipe 6 with the steel strand 5.

[0106] Step 205, after the steel pipe has completely passed through the necking die, the hydraulic ejector is closed.

[0107] In some embodiments, after the steel pipe has completely passed through the necking die and the steel pipe is completely engaged with the steel strand, the jacking hydraulic press is closed to stop jacking, and the jacking rod is driven to retreat in the direction of the jacking hydraulic press during the oil return process of the jacking hydraulic press.

[0108] Step 206, taking out the steel pipe and the steel strand in a direction away from the jacking assembly to complete the forming of the steel strand joint.

[0109] In some embodiments, after the steel pipe has completely passed through the necking die, the combined steel pipe and steel strand are taken out in a direction away from the jacking assembly to complete the forming of the joint in the middle of the steel strand.

[0110] In summary, in the present disclosure, the problem of insufficient connection strength is avoided by squeezing along the length direction of the steel pipe, and a special retraction component is configured to realize the retraction of the steel pipe. Combined with the limit, it can effectively avoid collision with the mold during the retraction operation; a hydraulic hollow jack is used to realize squeezing the steel pipe at any position in the middle of the steel strand, and the scope of application is expanded; a screw is used to integrate the functional components into a whole, and the relative positions of the functional components can be continuously adjusted, which is suitable for connection operations of steel pipes and steel strands of various lengths and has a wide range of applications; with the help of visual recognition technology instead of manual quality inspection, the detection accuracy and efficiency of the bite quality of steel pipes and steel strands are greatly improved.

[0111] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. Steel strand joint forming machine, used to process joints at the ends and middle of steel strands, including: The steel strand joint forming machine comprises a push assembly, a necking assembly, a retracting assembly and a connecting guide rail, wherein the connecting guide rail is composed of four screws, and the push assembly, the necking assembly and the retracting assembly are connected in series as a whole through the connecting guide rail in sequence; The jacking assembly is composed of a jacking rod, a jacking hydraulic jack and a jacking fixed steel plate, and the jacking hydraulic jack adopts a hydraulic hollow jack; The necking assembly is equipped with a necking die capable of reducing the diameter of the steel pipe, the necking die is installed between a necking die fixing steel plate and a necking die front clamping steel plate, and the necking die fixing steel plate is fixed on the connecting guide rail by a fastening nut; The retraction assembly is provided with a retraction rod which can move toward the necking mold under the action of external force, and the retraction rod is made of a hollow steel pipe.

2. The steel strand joint forming machine according to claim 1, wherein: The retraction rod is fixed on the retraction fixing steel plate, and the retraction fixing steel plate drives the retraction rod to move toward the necking mold under the action of external force. The connecting guide rail is provided with a limiter that can prevent the retraction rod from hitting the necking mold.

3. The steel strand joint forming machine according to claim 1, wherein: The retraction rod is fixed on the retraction hydraulic top, which adopts a hydraulic hollow jack. The retraction hydraulic top is installed on the retraction fixed steel plate through threaded matching. The retraction rod moves toward the necking mold under the action of the retraction hydraulic top.

4. The steel strand joint forming machine according to claim 1, wherein: The push rod is installed at one end of the push hydraulic jack close to the necking assembly through a push rod mounting sleeve. A through hole with a diameter of 23 to 30 mm is opened along the length direction of the push rod. Driven by the hydraulic pressure of the push hydraulic jack, the push rod pushes the steel pipe through the necking die toward the retraction assembly. The push fixing steel plate is installed on the connecting guide rail through a fastening nut.

5. The steel strand joint forming machine according to claim 1, wherein: A necking mold fixing steel plate limiting countersunk hole matching the outer diameter of the necking mold is arranged at the center of the necking mold fixing steel plate. The necking mold is placed in the necking mold fixing steel plate limiting countersunk hole. The necking mold front clamping steel plate is installed on the necking mold fixing steel plate through four necking mold fastening screws. The necking mold fixing steel plate is installed on the connecting guide rail through a fastening nut.

6. The steel strand joint forming machine according to claim 5, wherein: A circular hole of the front clamping steel plate of the necking mold is arranged in the center of the front clamping steel plate of the necking mold, the diameter of the circular hole of the front clamping steel plate of the necking mold is between the inner diameter and the outer diameter of the necking mold, and the diameter of the small hole of the limiting countersunk hole of the fixed steel plate of the necking mold is between the inner diameter and the outer diameter of the necking mold.

7. An operating method of a steel strand joint forming machine, used for the steel strand joint forming machine as claimed in any one of claims 1 to 6, comprising: Pass the steel strand through the retraction rod and the necking mold in sequence, install the steel pipe on the side of the necking mold close to the jacking assembly, and extend the end of the steel strand into the steel pipe to the set length; The jacking hydraulic jack is started, and the jacking rod is driven by the hydraulic pressure of the jacking hydraulic jack to push the steel pipe toward the retracting component through the necking die, and the steel pipe is occluded and connected with the steel strand after being reduced in diameter; When the end of the steel strand in the steel pipe is completely engaged with the steel pipe, close the hydraulic jack and move the jacking rod back in the direction of the hydraulic jack; The retraction assembly is started, the retraction rod moves toward the necking die and contacts the steel pipe, and the steel pipe moves toward the push assembly under the drive of the retraction rod until the steel pipe completely exits the necking die, and then the retraction assembly is closed; Take out the steel pipe and steel strand and complete the forming of the steel strand joint.

8. The method for operating the steel strand joint forming machine according to claim 7, wherein: The startup rollback component includes: The retracting fixed steel plate is manually pushed to move toward the necking die, and the retracting rod hits the steel pipe driven by the retracting fixed steel plate; Or start the retraction hydraulic top, and the retraction rod moves toward the necking mold under the action of the retraction hydraulic top.

9. The method for operating the steel strand joint forming machine according to claim 7, wherein: The set length is 3.0-5.0 times the outer diameter of the steel strand.

10. An operating method of a steel strand joint forming machine, used for the steel strand joint forming machine as claimed in any one of claims 1 to 6, comprising: Remove the rollback components; Install the steel pipe on the side of the necking die close to the ejection assembly; Pass the steel strand through the necking die, steel pipe, jacking rod and jacking hydraulic jack in sequence; The jacking hydraulic jack is started, and the jacking rod is driven by the hydraulic pressure of the jacking hydraulic jack to push the steel pipe toward the retracting component through the necking die, and the steel pipe is occluded and connected with the steel strand after being reduced in diameter; When the steel pipe has completely passed through the necking die, close the hydraulic jack; The steel pipe and the steel strand are taken out in a direction away from the jacking assembly to complete the forming of the steel strand joint.

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