A steel cord post-weld straightening device and method

Abstract

This invention discloses a straightening device for welded steel cord, comprising: a base and a cabinet fixed on the base, with a straightening section on one side of the cabinet; the straightening section includes a fixed support, a movable support, and two sets of spaced clamping mechanisms, one set of clamping mechanisms connected to the end of the fixed support near the movable support, and the other set of clamping mechanisms connected to the end of the movable support near the fixed support, the movable support capable of moving the other set of clamping mechanisms; a straightening method for the straightening device is also disclosed. During the annealing process of the welded steel cord, this invention stretches the weld joint into a dumbbell shape using the movable support and clamping mechanisms, thereby saving grinding time at the weld joint; simultaneously, cooling is performed while maintaining the tensile force, resulting in straightened welded steel cord that is easier to pass through the die, improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of steel cord welding technology, and in particular to a device and method for straightening steel cords after welding. Background Technology

[0002] Elevators, as indispensable vertical transportation tools in modern building systems, rely on traction suspension devices for both transmission and safety. The use of coated steel strips is becoming increasingly widespread, making quality and production efficiency control crucial during steel strip manufacturing. Currently, in continuous production, steel strips from successive batches need to be welded together. The weld spatter is then ground and hammered using a grinding wheel until its diameter is smaller than the die orifice. Only after the weld spatter passes through the die can the next batch continue production. Existing welding technology involves welding the steel cord under stress, resulting in a zigzag shape at the weld point. Some butt welding equipment causes the steel cord to move inward during welding, reducing the weld spatter size but still preserving the zigzag shape. After welding, grinding the weld spatter easily breaks the steel cord strands, causing them to curl up or preventing the zigzag shape from passing through the die. In the steel strip production process, the high precision required for the center distance of multiple steel cords necessitates that the diameter of the die bead must be no more than 0.05mm larger than the steel cord diameter. This places high demands on the welding of the steel cords, which existing welding equipment struggles to achieve. Repeated rework and refining are necessary during production, resulting in significant time and labor costs. In severe cases, if forced through the die with excessive tension, the weld point can easily break at the die, causing production interruption. This severely impacts production efficiency and increases production costs.

[0003] The "Wire Welding Machine and Method for Wire Welding" disclosed in Chinese patent literature, publication number CN111565879B, published on June 24, 2022, describes a welding machine used to weld metal wires end-to-end. Each tool in the machine has a tool indicator indicating whether it is in a completed or incomplete state. The tools can be processing tools for fine machining of the welded part, or test tools that allow the welded part to be tested after fine machining. Before welding begins, the first metal wire is held in the clamp. This action sets all tool indicators to the incomplete state. After a processing tool is used, its corresponding processing tool indicator is set to the completed state. Similarly, when the welded part passes the specifications of the test tool, the test tool indicator is set to completed. When both the processing tool indicator and the test tool indicator are set to the completed state, the clamp is opened. This ensures that the operator completes all necessary steps and inspects the welded part. This technology ensures welding quality by confirming the steps in the welding process. However, weld points with a diameter significantly larger than the weld line still require fine machining and grinding, which greatly affects production efficiency and increases production costs. Summary of the Invention

[0004] This invention aims to overcome the problems in existing technologies where, after welding steel cords, weld points with diameters much larger than the steel cord require precision grinding before passing through a die to complete the welding process. This process is time-consuming, labor-intensive, and inefficient. The invention provides a steel cord straightening device and method after welding. During the annealing process of the welded steel cord, the weld points are stretched into a dumbbell shape by a moving support and clamping mechanism, thus saving grinding time. Simultaneously, cooling is performed while maintaining the tensile force, straightening the welded steel cord and making it easier to pass through the die, thereby improving production efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A straightening device for welded steel cord includes: a base and a cabinet fixed on the base, wherein a straightening section is provided on one side of the cabinet;

[0007] The straightening section includes a fixed support section, a movable support section, and two sets of clamping mechanisms spaced apart. One set of clamping mechanisms is connected to the end of the fixed support section near the movable support section, and the other set of clamping mechanisms is connected to the end of the movable support section near the fixed support section. The movable support section can drive the other set of clamping mechanisms to move.

[0008] This invention designs a device for straightening steel cord after welding. The cabinet contains a corresponding control program and power circuit, which are common existing technologies and therefore will not be described in detail. The entire device has a complete power-on annealing circuit. The device passes through a power source inside the cabinet, a fixed support, a set of clamping mechanisms, the welded steel cord, another set of clamping mechanisms, and a movable support before returning to the cabinet. The welded steel cord is then heated and annealed by electricity. During the annealing process, the movable support drives the other set of clamping mechanisms to stretch away from the first set of clamping mechanisms, thereby straightening the welded steel cord and stretching the weld point. This reduces the diameter of the weld point after cooling, eliminating the need for fine grinding. Only rough grinding is required for the welded steel cord to pass through the die, saving grinding time and improving production efficiency.

[0009] Preferably, the clamping mechanism includes an upper pressure block, a lower pressure block, and several connecting rods connecting the two pressure blocks; a limit nut is fixed to the top of each connecting rod, an adjusting nut is provided at the bottom of the connecting rod farthest from the cabinet, and a spring sleeved on the connecting rod is fixed between the bottom surface of the lower pressure block and the adjusting nut.

[0010] This invention comprises two sets of clamping mechanisms. One set of clamping mechanisms is used to clamp one end of the welded steel cord, and the other set of clamping mechanisms is used to clamp the other end of the welded steel cord, so that the welding point is located between the two sets of clamping mechanisms. Thus, the welding point can be stretched by moving the other set of clamping mechanisms. The combination of the limiting nut, connecting rod, spring, and adjusting nut is used to apply an interaction force to the upper and lower pressure blocks to complete the clamping of the steel cord. At the same time, the clamping force between the upper and lower pressure blocks can be indirectly adjusted by rotating the adjusting nut, thereby changing the compression of the spring.

[0011] Preferably, the fixed support includes a first support frame, which is fixed to the cabinet by a first support block; the first support frame is connected to one end of a first conductive rail and one end of a first insulating rail, and a set of clamping mechanisms are connected to the other end of the first conductive rail and the other end of the first insulating rail.

[0012] In this invention, the fixed support part is a stationary component connected to the cabinet body. A set of clamping mechanisms connected to the fixed support part is also stationary, ensuring that one end of the clamped steel cord remains fixed. Conductive cables exist inside the first support frame and the first support block, connecting the first conductive rail to the inside of the cabinet body. The steel cord is energized through the first conductive rail, a portion of the lower pressure block, and the lower clamping block. The first conductive rail and the first insulating rail are parallel to each other and parallel to the side of the cabinet body connected to the straightening portion. The first conductive rail is positioned further away from the cabinet body than the first insulating rail. The arrangement of the two rails connecting the first support frame and the set of clamping mechanisms makes the entire connection structure more stable and less prone to shaking.

[0013] Preferably, the movable support includes a second support frame, which is fixed to the cabinet by a second support block; the second support frame is connected to another set of clamping mechanisms by a second conductive rail, a second insulating rail and a telescopic member that are parallel to each other; a motor connected to the telescopic member is also fixed on the second support frame; a first limiting ring and a second limiting ring are respectively provided at one end of the second conductive rail and the second insulating rail near the clamping mechanism.

[0014] In this invention, the movable support part is a structure connected to the cabinet and partially movable. Another set of clamping mechanisms connected to the movable support part is movable, allowing the other end of the clamped steel cord to be stretched. The movable support part includes the same structure as the fixed support part, but also includes a telescopic component and a motor to drive the other set of clamping mechanisms connected to the movable support part to move along the central axis of the guide rail. The second conductive guide rail and the second insulating guide rail serve the same purpose as the same structure in the fixed support part. In addition, a first limiting ring and a second limiting ring are respectively provided on the two guide rails to limit the farthest position of the other set of clamping mechanisms relative to the first set of clamping mechanisms, preventing the steel cord from being directly broken due to excessive distance.

[0015] Preferably, the upper surface of the lower pressure block away from the cabinet is provided with a conductive lower clamping block; the lower surface of the upper pressure block away from the cabinet is provided with an upper clamping block that matches the lower clamping block.

[0016] In this invention, a lower clamping block and an upper clamping block are respectively provided between the lower pressure block and the upper pressure block for clamping the steel cord. The lower clamping block is conductive and is connected to the first or second conductive rail through a part of its internal area. The outer surfaces of the lower pressure block, the upper pressure block, and the upper clamping block are all insulated from each other, which can avoid the danger of contact caused by direct human contact. In addition, the lower clamping block and the upper clamping block are detachable and replaceable. Different clamping shapes of upper and lower clamping blocks can be selected according to different steel cords, or new upper and lower clamping blocks can be replaced after a long period of use.

[0017] Preferably, the upper surface of the lower pressure block is provided with a rotating groove near the lower clamping block for rotating connection with the rotary switch; the rotary switch includes a semi-cylinder in the middle and a first limiting post and a second limiting post at both ends of the semi-cylinder, and a rotating rod is fixed on the second limiting post; the cross-sectional radius of the semi-cylinder is the same as the radius of the rotating groove.

[0018] In this invention, each clamping mechanism is equipped with a rotary switch. The purpose of the rotary switch is to raise the distance between the upper and lower pressure blocks and place the welded steel cord between them. Then, by rotating the rotary switch, the upper and lower pressure blocks are clamped together, thus completing the clamping of the steel cord. The semi-cylinder on the rotary switch matches the cross-sectional shape of the rotating groove in the lower pressure block, and has the same radius. Therefore, when the semi-cylinder is completely inside the rotating groove, the clamping of the steel cord is complete. When the rotary switch is rotated so that part of the semi-cylinder protrudes out of the rotating groove, the semi-cylinder will push the upper pressure block upward, thereby raising it and increasing the distance between the upper and lower pressure blocks to leave a gap for placing or removing the steel cord.

[0019] A method for straightening steel cord after welding includes:

[0020] The two ends of the welded steel cord are fixed to two sets of clamping mechanisms respectively, and the welding point of the steel cord is located between the two sets of clamping mechanisms.

[0021] The cabinet is powered through a path of fixed support, a set of clamping mechanisms, steel cord, another set of clamping mechanisms, and movable support, and the welded joints of the steel cord are annealed.

[0022] During the annealing process, the moving support unit drives another set of clamping mechanisms to stretch the welding points of the steel cord, and the diameter of the thinnest stretch of the welding point is detected.

[0023] After annealing, the steel cord is cooled and then straightened after welding.

[0024] In this invention, a set tensile force is applied during the annealing process of the steel cord, causing the weld point to be stretched into a dumbbell shape. After the weld point is stretched and cooled, the original diameter of the weld point, which was much larger than the diameter of the steel cord itself, is reduced by stretching. Thus, in the subsequent grinding process, only rough grinding is needed to meet the requirements of the steel cord passing through the die, eliminating the need for time-consuming and labor-intensive fine grinding. At the same time, wire breakage is less likely to occur during the grinding process, and no zigzag shape is produced, improving the straightness of the steel cord and increasing production efficiency.

[0025] Preferably, during the annealing process, the current intensity is 50A-58A, and the energizing time is 50s-60s. The diameter of the thinnest part of the weld joint is 0.85-0.95 times the original diameter of the steel cord; the distance by which the movable support unit drives another set of clamping mechanisms to stretch the weld joint of the steel cord is 1.5-2 times the length of the weld joint along the central axis of the steel cord before stretching.

[0026] In this invention, the current intensity and energizing time can be set through a corresponding program inside the cabinet. The current intensity can be any value between 50A and 58A or any value between the two, and the energizing time can also be selected in the same way. At the same time, the minimum diameter of the weld joint is set to 0.85 to 0.95 times the original steel cord diameter. This can avoid the steel cord itself being unqualified due to insufficient strength after welding because the diameter of the weld joint is too small, and at the same time, it can avoid the need for fine grinding because the diameter of the weld joint is still large after stretching. The stretching distance of the weld joint is a parameter related to the minimum diameter of the weld joint. Within the range of the stretching diameter of the weld joint, there is a corresponding limit on the stretching length of the weld joint. The stretching time required during the entire annealing process is calculated based on the stretching length and the stretching speed of the steel cord by the moving support.

[0027] The present invention has the following beneficial effects: during the annealing process of the welded steel cord, the weld point is stretched into a dumbbell shape by moving the support and clamping mechanism, thereby saving the grinding time of the weld point and making it less prone to wire breakage; at the same time, the weld point is cooled while maintaining the tension, so that the welded steel cord is straightened and can easily pass through the die and other wire guides, reducing the weld point from getting stuck and breaking in the die, facilitating production, reducing the difficulty of operation for workers, and improving the efficiency and quality of welding and grinding. Attached Figure Description

[0028] Figure 1 This is a front view of the straightening device in this invention;

[0029] Figure 2 This is a schematic diagram of the straightening part of the straightening device in this invention;

[0030] Figure 3 This is a schematic diagram of the area near the rotary switch in the straightening device of the present invention;

[0031] Figure 4 This is a flowchart of the straightening method in this invention;

[0032] Figure 5 This is a schematic diagram of the welding point of the steel cord after annealing and stretching in this invention;

[0033] In the diagram: 1. Base; 2. Cabinet; 3. Steel cord; 4. Fixed support; 5. Moving support; 6. Clamping mechanism; 7. Rotary switch; 8. Accessory mechanism; 31. Dumbbell-shaped welding point; 41. First support block; 42. First support frame; 43. First conductive rail; 44. First insulating rail; 51. Motor; 52. Second support block; 53. Second support frame; 54. Second conductive rail; 55. First limiting ring; 56. Second insulating rail; 57. Second limiting ring; 58. Telescopic component; 61. Upper pressure block; 611. Upper clamping block; 62. Lower pressure block; 621. Lower clamping block; 622. Rotating groove; 63. Connecting rod; 64. Spring; 65. Adjusting nut; 66. Limiting nut; 71. Semi-cylinder; 72. First limiting post; 73. Second limiting post; 74. Rotating rod. Detailed Implementation

[0034] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 As shown, a straightening device for steel cord after welding includes: a base 1 and a cabinet 2 fixed on the base 1, with a straightening section provided on one side of the cabinet 2;

[0036] The straightening section includes a fixed support part 4, a movable support part 5, and two sets of clamping mechanisms 6 spaced apart. One set of clamping mechanisms 6 is connected to the end of the fixed support part 4 near the movable support part 5, and another set of clamping mechanisms 6 is connected to the end of the movable support part 5 near the fixed support part 4. The movable support part 5 can drive the other set of clamping mechanisms 6 to move.

[0037] like Figure 2 As shown, the clamping mechanism 6 includes an upper pressure block 61, a lower pressure block 62, and several connecting rods 63 connecting the two pressure blocks; a limit nut 66 is fixed at the top of each connecting rod 63, and an adjusting nut 65 is provided at the bottom of the connecting rod farthest from the cabinet 2. A spring 64 sleeved on the connecting rod 63 is fixed between the bottom surface of the lower pressure block 62 and the adjusting nut 65.

[0038] The fixed support part 4 includes a first support frame 42, which is fixed to the cabinet 2 by a first support block 41. The first support frame 42 is connected to one end of the first conductive rail 43 and one end of the first insulating rail 44. The other end of the first conductive rail 43 and the other end of the first insulating rail 44 are connected to a set of clamping mechanisms 6, and an intermediate rail is formed between the two sets of clamping mechanisms through the set of clamping mechanisms 6. The intermediate rail is insulated.

[0039] The movable support unit 5 includes a second support frame 53, which is fixed to the cabinet 2 by a second support block 52. The second support frame 53 is connected to another set of clamping mechanisms 6 through a second conductive rail 54, a second insulating rail 56 and a telescopic member 58 that are parallel to each other, and passes through the other set of clamping mechanisms 6 to form an intermediate guide rail located between the two sets of clamping mechanisms. The intermediate guide rail is insulated. The other set of clamping mechanisms 6 can slide along the second conductive rail 54 and the second insulating rail 56. A motor 51 connected to the telescopic member 58 is also fixed on the second support frame 53 for controlling the extension and retraction of the telescopic member 58. A first limiting ring 55 and a second limiting ring 57 are respectively provided at the ends of the second conductive rail 54 and the second insulating rail 56 near the clamping mechanism.

[0040] An accessory mechanism 8 is fixed on the cabinet 2 between the two sets of clamping mechanisms 6. The accessory mechanism 8 is used to connect the first insulating guide rail 44 and the second insulating guide rail 56 to improve the stability of the entire straightening section and ensure the stability of the steel cord during the stretching process to avoid shaking. At the same time, a corresponding temperature detection device or laser measurement device can be fixed on the accessory mechanism as needed to detect the welding points of the steel cord during the annealing and stretching process.

[0041] The upper surface of the lower pressure block 62 away from the cabinet 2 is provided with a conductive lower clamping block 621; the lower surface of the upper pressure block 61 away from the cabinet 2 is provided with an upper clamping block 611 that matches the lower clamping block 621.

[0042] like Figure 3 As shown, a rotating groove 622 is provided on the upper surface of the lower pressure block 62 near the lower clamping block 621 for rotating connection with the rotary switch 7; the rotary switch 7 includes a semi-cylinder 71 located in the middle and a first limiting post 72 and a second limiting post 73 at both ends of the semi-cylinder 71, and a rotating rod 74 is fixed on the second limiting post 73; the cross-sectional radii of the first limiting post 72 and the second limiting post 73 are greater than the cross-sectional radius of the semi-cylinder 71; the cross-sectional radius of the semi-cylinder 71 is the same as the radius of the rotating groove 622, and the length of the semi-cylinder 71 is the same as the length of the rotating groove 622.

[0043] This invention designs a device for straightening steel cord after welding. The cabinet contains a corresponding control program and power circuit, which are common existing technologies and therefore will not be described in detail. The entire device has a complete power-on annealing circuit. The device passes through a power source inside the cabinet, a fixed support, a set of clamping mechanisms, the welded steel cord, another set of clamping mechanisms, and a movable support before returning to the cabinet. The welded steel cord is then heated and annealed by electricity. During the annealing process, the movable support drives the other set of clamping mechanisms to stretch away from the first set of clamping mechanisms, thereby straightening the welded steel cord and stretching the weld point. This reduces the diameter of the weld point after cooling, eliminating the need for fine grinding. Only rough grinding is required for the welded steel cord to pass through the die, saving grinding time and improving production efficiency.

[0044] This invention comprises two sets of clamping mechanisms. One set of clamping mechanisms is used to clamp one end of the welded steel cord, and the other set of clamping mechanisms is used to clamp the other end of the welded steel cord, so that the welding point is located between the two sets of clamping mechanisms. Thus, the welding point can be stretched by moving the other set of clamping mechanisms. The combination of the limiting nut, connecting rod, spring, and adjusting nut is used to apply an interaction force to the upper and lower pressure blocks to complete the clamping of the steel cord. At the same time, the clamping force between the upper and lower pressure blocks can be indirectly adjusted by rotating the adjusting nut, thereby changing the compression of the spring.

[0045] In this invention, the fixed support part is a stationary component connected to the cabinet body. A set of clamping mechanisms connected to the fixed support part is also stationary, ensuring that one end of the clamped steel cord remains fixed. Conductive cables exist inside the first support frame and the first support block, connecting the first conductive rail to the inside of the cabinet body. The steel cord is energized through the first conductive rail, a portion of the lower pressure block, and the lower clamping block. The first conductive rail and the first insulating rail are parallel to each other and parallel to the side of the cabinet body connected to the straightening portion. The first conductive rail is positioned further away from the cabinet body than the first insulating rail. The arrangement of the two rails connecting the first support frame and the set of clamping mechanisms makes the entire connection structure more stable and less prone to shaking.

[0046] In this invention, the movable support part is a structure connected to the cabinet and partially movable. Another set of clamping mechanisms connected to the movable support part is movable, allowing the other end of the clamped steel cord to be stretched. The movable support part includes the same structure as the fixed support part, but also includes a telescopic component and a motor to drive the other set of clamping mechanisms connected to the movable support part to move along the central axis of the guide rail. The second conductive guide rail and the second insulating guide rail serve the same purpose as the same structure in the fixed support part. In addition, a first limiting ring and a second limiting ring are respectively provided on the two guide rails to limit the farthest position of the other set of clamping mechanisms relative to the first set of clamping mechanisms, preventing the steel cord from being directly broken due to excessive distance.

[0047] In this invention, a lower clamping block and an upper clamping block are respectively provided between the lower pressure block and the upper pressure block for clamping the steel cord. The lower clamping block is conductive and is connected to the first or second conductive rail through a part of its internal area. The outer surfaces of the lower pressure block, the upper pressure block, and the upper clamping block are all insulated from each other, which can avoid the danger of contact caused by direct human contact. In addition, the lower clamping block and the upper clamping block are detachable and replaceable. Different clamping shapes of upper and lower clamping blocks can be selected according to different steel cords, or new upper and lower clamping blocks can be replaced after a long period of use.

[0048] In this invention, each clamping mechanism is equipped with a rotary switch. The purpose of the rotary switch is to raise the distance between the upper and lower pressure blocks and place the welded steel cord between them. Then, by rotating the rotary switch, the upper and lower pressure blocks are clamped together, thus completing the clamping of the steel cord. The semi-cylinder on the rotary switch matches the cross-sectional shape of the rotating groove in the lower pressure block, and has the same radius. Therefore, when the semi-cylinder is completely inside the rotating groove, the clamping of the steel cord is complete. When the rotary switch is rotated so that part of the semi-cylinder protrudes out of the rotating groove, the semi-cylinder will push the upper pressure block upward, thereby raising it and increasing the distance between the upper and lower pressure blocks to leave a gap for placing or removing the steel cord.

[0049] like Figure 4 As shown, a method for straightening steel cord after welding includes:

[0050] The two ends of the welded steel cord are fixed to two sets of clamping mechanisms respectively, and the welding point of the steel cord is located between the two sets of clamping mechanisms.

[0051] The cabinet is powered through a path of fixed support, a set of clamping mechanisms, steel cord, another set of clamping mechanisms, and movable support, and the welded joints of the steel cord are annealed.

[0052] During the annealing process, the moving support unit drives another set of clamping mechanisms to stretch the welding points of the steel cord, and the diameter of the thinnest stretch of the welding point is detected by laser scanning.

[0053] After annealing, the steel cord is cooled and then straightened after welding.

[0054] During the annealing process, the current intensity is 50A-58A, and the energizing time is 50s-60s. The diameter of the thinnest part of the weld joint is 0.85-0.95 times the original diameter of the steel cord. The distance by which the moving support unit drives another set of clamping mechanisms to stretch the weld joint of the steel cord is 1.5-2 times the length of the weld joint along the central axis of the steel cord before stretching. The speed at which the moving support unit drives another set of clamping mechanisms to stretch the steel cord is 0.1-0.5mm / s.

[0055] In this invention, a set tensile force is applied during the annealing process of the steel cord, such that... Figure 5 The welding points of the steel cord shown are stretched into dumbbell-shaped welding points 31. After being stretched, the welding points are cooled. The original diameter of the welding points, which was much larger than the diameter of the steel cord itself, is reduced by stretching. Therefore, in the subsequent grinding process, only rough grinding is needed to meet the requirements of the steel cord passing through the die, eliminating the need for time-consuming and laborious fine grinding. At the same time, wire breakage is less likely to occur during the grinding process, and no kink is produced, which improves the straightness of the steel cord and increases production efficiency.

[0056] In this invention, the current intensity and energizing time can be set through a corresponding program inside the cabinet. The current intensity can be any value between 50A and 58A or any value between the two, and the energizing time can also be selected in the same way. At the same time, the minimum diameter of the weld joint is set to 0.85 to 0.95 times the original steel cord diameter. This can avoid the steel cord itself being unqualified due to insufficient strength after welding because the diameter of the weld joint is too small, and at the same time, it can avoid the need for fine grinding because the diameter of the weld joint is still large after stretching. The stretching distance of the weld joint is a parameter related to the minimum diameter of the weld joint. Within the range of the stretching diameter of the weld joint, there is a corresponding limit on the stretching length of the weld joint. The stretching time required during the entire annealing process is calculated based on the stretching length and the stretching speed of the steel cord by the moving support.

[0057] In this invention, when welding steel cords, two steel cords of the same diameter are used for welding, so that the diameter of the weld point is larger than the original diameter of the steel cord. Then, annealing and stretching treatment is performed. The current intensity during the annealing and stretching process is controlled so that the diameter and length of the weld point after stretching can meet the requirements and can pass through the die that matches the diameter of the steel cord. Therefore, only rough grinding is needed to complete the welding of the steel cord and the requirement to pass through the die. In this invention, the diameter of the weld point of the welded steel cord is larger than the diameter of the steel cord. After annealing and stretching, the diameter of the thinnest part of the weld point is 0.85-0.95 times the diameter of the steel cord, and the length of the weld point is stretched to 1.5-2 times the original length of the weld point. This results in the maximum diameter of the dumbbell-shaped weld point after stretching being no greater than or slightly greater than the diameter of the target steel cord. Since the diameter of the die is only allowed to be within 0.05mm larger than the diameter of the steel cord when setting the die, it is only necessary to ensure that the maximum diameter of the weld point after annealing and stretching fluctuates within the range of 0.05mm larger than the diameter of the steel cord. The welding of the steel cord and its passage through the die can be completed by rough grinding.

[0058]

[0059]

[0060] When the diameter of the steel cord is selected as 2 mm in the table, the diameter of the die must be within 2.05 mm. For annealing and stretching methods where the annealing current is between 50A and 58A and the annealing time is between 50s and 60s, but the diameter of the weld point after stretching is greater than 0.95 times the diameter of the steel cord and the length of the weld point after stretching is less than 1.5 times the length of the weld point before stretching, the maximum diameter of the weld point after stretching is much greater than the required die diameter of 2.05 mm, provided that the breaking force requirement is met. Similarly, for stretching methods where the annealing current is less than 50A or greater than 58A and the annealing time is less than 50s or greater than 60s, the maximum diameter of the weld point after stretching is much greater than the required die diameter of 2.05 mm, provided that the breaking force requirement is met. Therefore, the welding and straightening of the steel cord cannot be completed by rough grinding; fine grinding is required, which is time-consuming and laborious. For annealing and stretching methods where the annealing current is between 50A and 58A, the annealing time is between 50s and 60s, the diameter of the weld point after stretching is 0.85 to 0.95 times the diameter of the steel cord, and the length of the weld point after stretching is 1.5 to 2 times the length of the weld point before stretching, the maximum diameter of the weld point after stretching can be within or slightly larger than 2.05 mm of the die diameter, while meeting the breaking force requirements. In this case, only rough grinding is needed to complete the welding of the steel cord and pass it through the die.

[0061] The above embodiments are further elaborations and descriptions of the present invention to facilitate understanding, and are not intended to limit the present invention in any way. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A post-weld straightening device for steel cords, characterized in that, include: A base and a cabinet fixed on the base, wherein a straightening section is provided on one side of the cabinet; The straightening section includes a fixed support section, a movable support section, and two sets of clamping mechanisms spaced apart. One set of clamping mechanisms is connected to the end of the fixed support section near the movable support section, and the other set of clamping mechanisms is connected to the end of the movable support section near the fixed support section. The movable support section can drive the other set of clamping mechanisms to move. The clamping mechanism includes an upper pressure block, a lower pressure block, and several connecting rods connecting the two pressure blocks; a limit nut is fixed at the top of each connecting rod, an adjusting nut is provided at the bottom of the connecting rod farthest from the cabinet, and a spring sleeved on the connecting rod is fixed between the bottom surface of the lower pressure block and the adjusting nut; The movable support unit includes a second support frame, which is fixed to the cabinet by a second support block; the second support frame is connected to another set of clamping mechanisms by a second conductive rail, a second insulating rail and a telescopic component that are parallel to each other; a motor connected to the telescopic component is also fixed on the second support frame.

2. A post-weld straightening device for steel cords according to claim 1, characterized in that The fixed support part (4) includes a first support frame (42), which is fixed to the cabinet (2) by a first support block (41); the first support frame (42) is connected to one end of the first conductive rail (43) and one end of the first insulating rail (44), and a set of clamping mechanisms (6) are connected to the other end of the first conductive rail (43) and the other end of the first insulating rail (44).

3. A steel cord post-weld straightening device according to claim 1 or 2, characterized in that The second conductive rail (54) and the second insulating rail (56) are respectively provided with a first limiting ring (55) and a second limiting ring (57) at one end near the clamping mechanism.

4. A post-weld straightening device for steel cords according to claim 1, characterized in that The upper surface of the lower pressure block (62) away from the cabinet (2) is provided with a conductive lower clamping block (621); the lower surface of the upper pressure block (61) away from the cabinet (2) is provided with an upper clamping block (611) that matches the lower clamping block (621).

5. A steel cord post-weld straightening device according to claim 1 or 4, characterized in that The upper surface of the lower pressure block (62) near the lower clamping block (621) is provided with a rotating groove (622) for rotating connection with the rotary switch (7); the rotary switch (7) includes a semi-cylinder (71) located in the middle and a first limiting post (72) and a second limiting post (73) at both ends of the semi-cylinder (71), and a rotating rod (74) is fixed on the second limiting post (73); the cross-sectional radius of the semi-cylinder (71) is the same as the radius of the rotating groove (622).

6. A method for straightening a steel cord after welding, suitable for use in a straightening device according to any one of claims 1-5, characterized in that include: The two ends of the welded steel cord are fixed to two sets of clamping mechanisms respectively, and the welding point of the steel cord is located between the two sets of clamping mechanisms. The cabinet is powered through a path of fixed support, a set of clamping mechanisms, steel cord, another set of clamping mechanisms, and movable support, and the welded joints of the steel cord are annealed. During the annealing process, the moving support unit drives another set of clamping mechanisms to stretch the welding points of the steel cord, and the diameter of the thinnest stretch of the welding point is detected. After annealing, the steel cord is cooled and then straightened after welding.

7. A method of straightening a steel cord after welding according to claim 6, characterized in that, During the annealing process, the current intensity is 50A-58A and the energizing time is 50s-60s.

8. A method for straightening steel cord after welding according to claim 6 or 7, characterized in that, The diameter of the thinnest part of the weld point is 0.85-0.95 times the original diameter of the steel cord; the moving support unit drives another set of clamping mechanisms to stretch the weld point of the steel cord by a distance that is 1.5-2 times the length of the weld point of the steel cord along the central axis of the steel cord before stretching.

Images