Color-coated strip steel riveting device and butt joint method using same

Abstract

The invention relates to a color-coated strip steel riveting device. The color-coated strip steel riveting device comprises a front centering platform, a sewing machine, a rear centering platform and a flattening machine which are connected in sequence, the sewing machine comprises a mounting frame, and a guide column, a riveting die and a hydraulic oil cylinder are arranged in the middle of the mounting frame. The riveting die comprises an upper die and a lower die, and strip steel is arranged between the upper die and the lower die. The lower die ascends under the pushing of the hydraulic oil cylinder and is used for riveting the strip steel together with the upper die; a belt tail pinch roll and a belt tail picking sleeve are further arranged between the rear centering platform and the flattening machine, and the belt tail picking sleeve is controlled by a driving air cylinder; a converging pinch roll provided with an encoder is arranged at the front end of the front centering platform. The invention also comprises a docking method using the device. Riveting butt joint is adopted, the influence of a coating and a plating layer on butt joint of the belt head and the belt tail can be avoided, meanwhile, connection of a lower coil of steel belt of a continuous production unit can be achieved, the rivet joint part is firm and stable, and the problems of breakage, cracking, misalignment of a butt joint and the like can be avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of strip steel riveting, and particularly relates to a color-coated strip steel riveting device and a butt joint method using the same. BACKGROUND

[0002] Riveting of color-coated strip steel is an important operation technology of a color-coated strip production line. Defects such as zinc residue, holes, scratches and color difference on the surface of the color-coated strip steel are removed and divided into rolls, and defects such as uncut edges. These color-coated rolls with defects need to be re-wound, coated, drawn, and cut by the edge unit for removal. At the same time, riveting technology is widely used in the butt joint of color-coated strip steel in the continuous production line. When the color-coated plate is butt jointed by riveting, the surface of the strip steel is covered with zinc layer and coating, the melting point of zinc is about 420 DEG C, and the boiling point is about 907 DEG C, which is difficult to handle. A large amount of heat energy is generated on the surface of the hot-dip galvanized strip steel during welding, and the zinc layer is evaporated first, a large amount of heat is taken away by the evaporation of the zinc layer, so that the remaining heat cannot penetrate the strip steel, and the effective fusion kernel size cannot be formed; when the welding current is increased, the heat energy is too high, and the high-pressure zinc vapor volatilization easily leads to the appearance of serious porosity and cavity defects on the surface of the thin galvanized strip steel (thickness ≤0.8mm), and the stable welding quality cannot be formed; at the same time, the volatilization of zinc vapor leads to the adhesion of a large amount of zinc powder on the surface of the welding wheel, so that the surface of the welding wheel is seriously scabbed, the heat conduction, electrical conductivity and heat dissipation performance of the welding wheel are greatly reduced, the welding performance of the galvanized strip steel is deteriorated, the effective welding of the galvanized strip steel welding quality cannot be realized, and the welding performance of the welding machine equipment is further affected, and re-welding cannot be realized. In addition, part of the paint on the surface of the color-coated strip steel has the characteristic of insulation, so that obvious defects are generated during the stitching of the strip steel by using the conventional spot welding operation, and the quality cannot be guaranteed.

[0003] An application patent with application number CN201910564326.X and name of a strip steel stitching machine tool is retrieved, which comprises a rack, an upper punching mechanism, a lower punching mechanism and a flattening mechanism. The application adopts a cold working punching mode to stitch the strip steel, and realizes punching and flanging and flattening through a servo motor and an electric cylinder. No light, heat, noise and smoke pollution is generated during the machining process, no pressure fluid is needed, and the on-site applicability is stronger. Different specifications and sizes of the upper punching head, the lower punching head and the flattening head can be selected and switched according to the minimum bending radius of the stitched strip steel on the roll equipment in the production line during stitching, so that riveting is realized while the strip steel is prevented from leaving scratches on the roll surface. The application has a certain improvement on the flatness of the strip steel, but cannot solve the butt joint problem caused by the fact that the surface of the strip steel is covered with zinc layer and coating. Therefore, the existing riveting device needs to be improved, and the butt joint method needs to be optimized. SUMMARY

[0004] The application provides a color-coated strip steel riveting device and a butt joint method using the same to solve the technical problems in the prior art, and has the characteristics of good connection effect and high flatness.

[0005] The present application comprises the following technical solutions: a color coated steel riveting device, comprising a front centering platform, a stitching machine, a rear centering platform and a flattening machine connected in sequence; the stitching machine comprises a mounting frame, a guide column, a riveting die and a hydraulic cylinder arranged in the middle of the mounting frame; the riveting die comprises an upper die and a lower die, and a strip steel is arranged between the upper die and the lower die; the lower die is lifted by the hydraulic cylinder and rivets the strip steel together with the upper die; a strip tail pinch roll and a strip tail pick-up sleeve are further arranged between the rear centering platform and the flattening machine, and the strip tail pick-up sleeve is controlled by a driving cylinder; a front end of the front centering platform is provided with a merging pinch roll on which an encoder is arranged.

[0006] Further, the mounting frame is a door-shaped frame, a back-shaped frame or a C-shaped frame.

[0007] Further, the upper die and the lower die each comprise a die base and a riveting working part, and a plurality of springs are arranged between the die base and the riveting working part; the middle part of the riveting working part of the lower die is provided with two rows of die protrusions, the cross section of the die protrusions is trapezoidal as a whole, and the two waists are fold lines; the middle part of the riveting working part of the upper die is provided with grooves matched with the die protrusions; when the upper die and the lower die form a clamping relationship, a riveting hole is left on the strip steel.

[0008] Further, a pressure regulating valve is arranged on the hydraulic cylinder, and an upper limit stroke switch is arranged beside the guide column.

[0009] Further, the front centering platform and the rear centering platform each center the strip steel by a centering abutment plate, and the centering action is completed by the quick closing and opening of the centering abutment plate.

[0010] A butt joint method of color coated strip steel, comprising the following steps:

[0011] S1, precisely cutting a strip head section strip steel and a strip tail section strip steel;

[0012] S2, the merging pinch roll sends the front end of the strip tail section strip steel into the strip tail pinch roll and the strip tail pick-up sleeve, and the tail end of the strip tail section strip steel stops advancing after passing through a strip tail first detection position located in front of the front centering platform; the strip tail pinch roll continues to send the strip tail section strip steel forward until the tail end of the strip tail section strip steel passes through a strip tail second detection position located in front of a feeding port of the stitching machine and stops; the strip tail pinch roll stops sending the strip, and at the same time, the driving cylinder has lifted the strip tail pick-up sleeve;

[0013] S3, the merging pinch roll sends the strip head section strip steel forward to a strip head detection position located at the outlet of the front centering platform, starts to record the meter and continues to send the strip head section strip steel forward by a preset length and then stops; at this time, the front end of the strip head section strip steel enters the stitching machine and overlaps with the tail end of the strip tail section strip steel above the lower die;

[0014] S4, the front and rear centering platforms push the center lines of the head and tail sections of the strip to the center of the production line according to the preset width of the strip, thereby completing the centering action;

[0015] S5, the lower die of the seaming machine is lifted by the hydraulic cylinder to perform the riveting action, and returns automatically when reaching the set pressure and contacting the upper limit travel switch, thereby completing the first riveting action to obtain a plurality of riveting holes in the shape of a trapezoid with two waists being fold lines; when the thickness of the seamed strip is less than 0.35 mm, secondary riveting is required, the front and rear centering platforms are opened, and the overlapped head and tail sections of the strip are continuously transported forward by a lap distance, and after the transport is completed, secondary centering and second riveting action are performed, and again a plurality of riveting holes in the shape of a trapezoid with two waists being fold lines are obtained;

[0016] S6, after the riveting action is completed, the front and rear centering platforms are opened, the tail pinch roller is opened, the tail lifting sleeve is lowered, and the merging pinch roller is operated to pull the two sections of the strip to build tension, the upper and lower seaming cutouts of the strip are hung together, and after the building tension is completed, the seaming part is transported forward to the flattening machine, the upper roller of the flattening machine is pressed down to flatten the seaming part, and then the flattening machine is lifted, and the butt joint of the strip is completed.

[0017] Further, the galvanized strip base plate steel grade includes CQ, DQ, and DDQ.

[0018] Further, the thickness of the zinc layer of the strip base plate is 30 g / m 2 ~ 140 g / m 2 .

[0019] Further, the tail first detection position, the tail second detection position, and the head detection position are respectively provided with a first sensor, a second sensor, and a third sensor, the operation of the merging pinch roller is controlled by the detection signals sent by the first sensor and the third sensor, the start of the operation of the tail pinch roller is controlled by the detection signal sent by the first sensor, and the stop of the operation of the tail pinch roller is controlled by the detection signal sent by the second sensor.

[0020] Further, as the tail pinch roller transports the strip in S2, the tail lifting sleeve slowly rises, the lifting sleeve platform behind the rear centering platform is lifted, a small lifting sleeve is formed to store the strip transported by the tail pinch roller in the tail lifting sleeve area, so as to facilitate the building tension operation after the riveting is completed.

[0021] Further, the first riveting head is formed after the first riveting in S5 (in actual production, the 0.18-0.35mm color-coated strip steel is easily cracked by the tension of the unit due to the thinness of the strip, so secondary riveting must be performed), the second riveting head is obtained after the second riveting of the first riveting head, and the first riveting head and the second riveting head are penetrated after the second riveting head leaves the range of the riveting die, so as to prevent the tension from causing cracking.

[0022] Further, the penetrating strip is a 7-15mm wide reinforcing strip penetrating between the riveting holes formed by the die at the overlapping part of the strip head and the strip tail, the length of the reinforcing strip is consistent with the width of the strip steel, and the width of the reinforcing strip is less than the longest opening of the riveting hole along the length direction of the strip steel.

[0023] Further, before the riveting action in S5, the riveting operation parameters of the seaming machine are set and the overlap amount is given; the hydraulic cylinder pressure is 800-2800KN, the strip conveying speed is 4-30m / min, the strip tail pick-up pressure is 750-1420daN, the flattening machine pressure is 800-3200daN, the overlap amount of the operation side of the seaming machine is 260mm-800mm, the overlap amount of the transmission side of the seaming machine is 260mm-800mm, the overlap amounts of the operation sides in the two riveting operations need to be consistent, the overlap amounts of the transmission sides also need to be consistent, and the center lines of the strip head and the strip tail strip need to coincide with the center line of the unit.

[0024] The application has the advantages and positive effects that:

[0025] 1. The application adopts riveting butt joint, which can avoid the influence of the coating and the plating on the butt joint of the strip head and the strip tail, and can achieve the connection of the lower coil strip of the continuous production unit, the riveting head part is firm and stable, and problems such as cracking, splitting and misalignment of the butt joint can be avoided.

[0026] 2. The riveting structure of the application adopts a penetrating strip structure to connect the strip head section strip steel and the strip tail section strip steel, and the reinforcing strip penetrates through a plurality of riveting holes which are in the shape of a trapezoid as a whole and have fold lines as the two waists; the design of such riveting holes can more effectively disperse the stress applied on the connection point and reduce the stress concentration phenomenon; the design of the fold lines makes the stress more evenly spread on the hole wall, thereby improving the durability and fatigue resistance of the connection part; when shearing force is applied, the force can be better transmitted along the hole wall, which helps to improve the stability of the connecting piece when subjected to lateral force, especially under dynamic load conditions, the fold line structure provides an additional support path, enhances the overall strength and reliability of the structure; in addition, this design can also improve the sealing performance of the connection, especially in applications requiring waterproof and dustproof, the design of the fold line of the riveting hole can form a natural barrier around the hole to prevent external substances from invading, which is very important for some special environmental applications.

[0027] 3. This invention solves the problem of the impact of coating and zinc layer on the connection of strip steel substrate by selectively choosing one-time riveting or two-time riveting. It can achieve high-quality connection of the head and tail of color-coated steel strip, reduce connection time and the use of transition plates, and ensure stable and reliable quality of the riveting seam. It also enables continuous operation of the color-coated steel sheet unit and improves production capacity.

[0028] 4. This invention uses a pressure regulating valve for pressure control, which allows for preset hydraulic pressure settings for steel strips of different thicknesses, ensuring quality when riveting steel strips of different specifications. Excessive pressure during thin plate riveting can easily cause cracks in the riveting seam, and can lead to adhesion between the mold and the strip at the upper and lower molds of the riveting machine, or warping of the strip extending beyond the mold. All of these problems affect the quality of the riveted joint. When riveting thick plates and strips, insufficient riveting pressure can easily result in incomplete riveting or incomplete riveting, leading to failure to stitch the thick plates together, poor stitching quality, and separation during assembly.

[0029] 5. The present invention installs sensors at three detection positions to determine the position of the front and rear strips, and precisely controls the position of the strip by coordinating the control of the converging pinch roll and the tail pinch roll, reducing personnel operation and operational risks, reducing the positioning time of the head and tail of the strip, and ensuring the stable operation of the unit.

[0030] 6. This invention employs two centering devices: a front centering platform and a rear centering platform. Simultaneously, it achieves rapid centering through a centering plate. During the centering operation, the preset width of the plate strip also prevents the edges of the thin plate from being deformed due to width changes, thus improving the safety of the operator, saving time, and ensuring the operation of the continuous unit. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the sewing machine.

[0033] Figure 3 This is a structural diagram of the lower mold;

[0034] Figure 4 This is a schematic diagram of the riveting structure of the present invention;

[0035] Figure 5 This is a flowchart of the docking method of the present invention;

[0036] In the figure, 1 - the convergence pinch roller; 2 - the front centering platform; 3 - the sewing machine; 301 - the mounting frame; 302 - the riveting die; 3021 - the die base; 3022 - the riveting working part; 3023 - the spring; 303 - the hydraulic cylinder; 304 - the guide column; 305 - the upper limit travel switch; 4 - the rear centering platform; 5 - the strip steel; 6 - the tail pinch roller; 7 - the tail pick-up; 8 - the flattening machine; 9 - the driving cylinder; 10 - the centering back plate; 11 - the tail first detection position; 12 - the head detection position; 13 - the reinforcing strip; 14 - the head section strip steel; 15 - the tail section strip steel; 16 - the riveting hole; 17 - the die protrusion. DETAILED DESCRIPTION

[0037] In order to further disclose the invention content, features and effects of the present application, the following examples are given and described in detail in combination with the drawings. In the description of the following examples, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the patent and simplifying the description, and therefore cannot be understood as limiting the patent.

[0038] In the description of the following examples, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "setting" should be understood broadly, for example, it can be fixedly connected, set, or it can be detachably connected, set, or integrally connected, set. For those skilled in the art, the specific meaning of the above terms in the patent can be understood according to the specific circumstances.

[0039] Embodiment: refer to the attached Figures 1-4 A color coated strip steel riveting device, comprising a front centering platform 2, a sewing machine 3, a rear centering platform 4 and a flattening machine 8 connected in turn; the sewing machine 3 comprises a mounting frame 301, and the mounting frame 301 is a door-shaped frame, a back-shaped frame or a C-shaped frame, etc. A guide column 304, a riveting die 302 and a hydraulic cylinder 303 are arranged in the middle of the mounting frame 301; the riveting die 302 comprises an upper die and a lower die, and a strip steel 5 is arranged between the two; the lower die is pushed up by the hydraulic cylinder 303 and rivets the strip steel 5 together with the upper die; a tail pinch roller 6 and a tail pick-up 7 are further arranged between the rear centering platform 4 and the flattening machine 8, and the tail pick-up 7 is controlled by a driving cylinder 9; the front end of the front centering platform 2 is provided with a convergence pinch roller 1 on which an encoder is mounted.

[0040] Both the upper and lower molds are composed of a mold base 3021 and a riveting working part 3022. Several springs 3023 are provided between the mold base 3021 and the riveting working part 3022. The riveting working part 3022 of the lower mold has two rows of detachable mold protrusions 17 (e.g., ...). Figure 3 As shown, in this example, there are specifically thirty-six mold protrusions 17, eighteen of which are arranged in each row; the mounting parts of the mold protrusions 17 (the mounting components of the mold protrusions 17) have a trapezoidal cross-section with two broken lines on the sides. The riveting working part 3022 of the upper mold has a groove in the middle that matches the mold protrusion 17; when the upper mold and the lower mold form an interlocking relationship, a riveting hole 16 is left on the strip steel 5. The hydraulic cylinder 303 is equipped with a pressure regulating valve, and an upper limit travel switch 305 is provided next to the guide column 304. The pressure regulating valve is used for pressure control, and the hydraulic pressure can be preset for different situations of steel strips of different thicknesses, so that the quality can be guaranteed when riveting strip steel 5 of different specifications. In existing constant pressure riveting technology, when the pressure cannot be adjusted during the riveting process, excessive pressure during thin plate riveting can easily cause cracks in the riveting seam, and can also lead to the mold and strip sticking together, or the strip extending beyond the mold can warp. All of these problems will affect the quality of the riveted joint. When riveting thick plates and strips, insufficient riveting pressure can easily result in incomplete riveting or incomplete riveting, causing the thick plates to fail to be sewn together, or the sewing quality to be poor, and the joint to pull apart during the assembly process.

[0041] Both the front centering platform 2 and the rear centering platform 4 are aligned with the strip steel 5 by centering plates 10, and the centering action is completed by the rapid closing and opening of the centering plates 10.

[0042] The method for butt welding color-coated steel strips using the above-mentioned riveting device includes the following steps:

[0043] S1. The leading section 14 and the trailing section 15 of the strip are precision-shorn; the base steel grades of the galvanized strip include: CQ, DQ, and DDQ. The zinc coating thickness of the strip base is 30g / m2 to 140g / m2.

[0044] S2, the merging pinch roll 1 sends the tail section of the strip 15 to the tail pinch roll 6 and the tail loop 7, the tail section of the strip 15 stops after passing the tail first detection position 11 in front of the front centering platform 2, the tail pinch roll 6 continues to send the tail section of the strip 15 until the tail section of the strip 15 stops after passing the tail second detection position in front of the feeding port of the seaming machine 3, the tail pinch roll 6 stops sending the strip while the drive cylinder 9 has already lifted the tail loop 7; in the S2, the tail loop 7 slowly rises as the tail pinch roll 6 sends the strip, the tail loop platform behind the rear centering platform 4 is lifted to form a small loop to store the strip 5 sent by the tail pinch roll 6 in the tail loop area, so as to facilitate the building operation after riveting is completed.

[0045] S3, the merging pinch roll 1 sends the head section of the strip 14 to the head detection position at the outlet of the front centering platform 2, starts to record the meter and continues to send the head section of the strip 14 forward by a preset length and then stops, at this time, the front end of the head section of the strip 14 enters the seaming machine 3 and overlaps with the tail end of the tail section of the strip 15 above the lower die;

[0046] S4, the front centering platform 2 and the rear centering platform 4 push the center lines of the head section of the strip 14 and the tail section of the strip 15 to the center of the production line according to the preset width of the strip 5, so as to complete the centering action; in the S5, before the riveting action starts, the seaming machine 3 is set with riveting operation parameters and given overlap; the pressure of the hydraulic cylinder 303 is 800-2800KN, the conveying speed of the strip 5 is 4-30m / min, the pressure of the tail loop 7 is 750-1420daN, the pressure of the flattening machine 8 is 800-3200daN, the overlap on the operation side of the seaming machine 3 is 260mm-800mm, and the overlap on the transmission side of the seaming machine 3 is 260mm-800mm. The overlaps on the operation side need to be consistent during the two riveting operations, the overlaps on the transmission side also need to be consistent, and the center lines of the head and tail plates of the strip need to coincide with the center line of the unit.

[0047] S5, the lower die of the seaming machine 3 is pushed up by the hydraulic cylinder 303 to perform the riveting action, and when it reaches the set pressure and contacts the upper limit travel switch, it automatically returns. When the control unit receives the upper limit signal, it controls the hydraulic cylinder 303 to descend, and at the same time, the spring 3023 in the riveting die 302 extends to separate the riveted strip steel 5 from the riveting die 302. The head and tail of the strip steel 5 are completely riveted through the die, and under the action of tension, the riveting holes 16 achieve self-locking state, completing the first riveting action to obtain two rows of riveting holes 16 that are trapezoidal in shape and have fold lines as the two waists; when the thickness of the seamed strip steel 5 is less than 0.35mm, secondary riveting is required. Open the front and rear centering platforms 2 and 4 and continue to transport the overlapped head section strip steel 14 and tail section strip steel 15 forward by a distance of one overlap amount. After the strip is delivered, secondary centering and second riveting action are performed, and again two rows of riveting holes 16 that are trapezoidal in shape and have fold lines as the two waists are obtained; in S5, after the first riveting, a first riveted joint is formed (in actual production, since the color-coated strip steel 0.18-0.35mm is too thin, it is easy to be torn by the tension of the unit, so secondary riveting must be performed), and after the first riveted joint moves out of the range of the riveting die, secondary riveting is performed to obtain a second riveted joint. After the second riveted joint moves out of the range of the riveting die, the first and second riveted joints are threaded, preventing the occurrence of tension tearing.

[0048] This design of riveting hole 16 can more effectively disperse the stress applied on the connection point and reduce stress concentration; the design of fold line allows the stress to be more evenly distributed on the hole wall, thereby improving the durability and fatigue resistance of the connection part; when subjected to shear force, the force can be better transmitted along the hole wall, helping to improve the stability of the connecting part under lateral force, especially under dynamic load conditions, the fold line structure provides an additional support path, enhancing the overall strength and reliability of the structure; in addition, this design can also improve the sealing of the connection, especially in applications that require waterproof and dustproof, the design of the fold line of the riveting hole 16 can form a natural barrier around the hole to prevent external substances from entering, which is very important for some special environmental applications. In addition, the wide trapezoidal side of this riveting hole 16 can compensate for slight deviations caused during stamping to some extent, so that even if there is a slight misalignment between the head section strip steel 14 and the tail section strip steel 15, the reinforcing strip 13 can still be inserted smoothly.

[0049] S6. After all riveting operations are completed, open the front centering platform 2 and the rear centering platform 4, open the tail clamping roller 6, lower the tail lifting sleeve 7, and move the converging clamping roller 1 backward to pull the two strip steel sections together. The upper and lower seam cuts of the strip steel are hooked together. After the seam is formed, transport the seam part forward to the flattening machine. The upper roller of the flattening machine 8 presses down to flatten the seam part and then lifts it up to prevent the protruding part of the riveting joint from scratching the rubber roller behind it. The strip steel 5 is now joined.

[0050] The first detection position of the belt tail, the second detection position of the belt tail, and the detection position of the belt head are respectively equipped with a first sensor, a second sensor, and a third sensor. The stopping of the operation of the converging pinch roller 1 is controlled by the detection signals sent by the first sensor and the third sensor. The starting of the operation of the belt tail pinch roller 6 is controlled by the detection signal sent by the first sensor. The stopping of the operation of the belt tail pinch roller 6 is controlled by the detection signal sent by the second sensor.

[0051] Experimental Example 1: The substrate steel is DX51D-Z, with a thickness of 0.25mm and a zinc layer thickness of 40g / m. 2 The galvanized steel strip substrate was used for riveting. The overlap on both the operating and transmission sides was set at 650mm. The pressure of the pushing cylinder was 900KN, the pressure of the tail sleeve was 800daN, the belt head and tail feeding speed was 18m / min, and the flattening machine pressure was 800daN. The first riveting began 60mm after the belt head; the second riveting began 370mm after the belt head. After riveting, reinforcing strips 13 (12mm wide) were inserted at both the first and second riveting joints. The converging pinch rollers and the tail pinch rollers simultaneously fed the strip forward at 30m / min through the edge flattening machine. The obtained riveted joints were tensioned using a machine assembly. A tensioning machine was set to a maximum tension of 35KN for a tensile test. The test results showed no tearing at the riveting joint, no deformation after inserting the reinforcing strip 13, good joint toughness, and the tensile test was passed.

[0052] The riveting procedure eliminates the riveting completion procedure after the first riveting, allowing the control to prevent the tail sleeve from retracting, the converging pinch roller and the tail pinch roller from opening, the inlet centering plate and the outlet centering plate from opening, and the converging pinch roller and the tail pinch roller to feed the strip steel to achieve a second riveting.

[0053] Experimental Example 2: The substrate steel is DX53D-Z, with a thickness of 0.5mm and a zinc layer thickness of 60g / m. 2galvanized steel substrate, the lap length of the operating side is set to 400 mm, the lap length of the driving side is 400 mm, the pressure of the pushing cylinder is 1200 KN, the pressure of the tail set is 1000 daN, the speed of the head and tail of the strip is 30 m / min, the pressure of the flattening machine is 1300 daN, the first riveting starts at 70 mm behind the head of the strip; after riveting, a 10 mm wide reinforcing strip 13 is inserted at the first riveting joint, and the converging pinch roll and the tail pinch roll simultaneously forward the strip at a speed of 30 m / min through the side flattening machine. The obtained riveting joint is tested by the tensioning machine in the form of a unit, and the tensioning machine is set to a large tension of 45 KN to test the riveting joint tension, and the experimental results show that the riveting joint interface does not tear, the reinforcing strip 13 does not deform, the joint toughness is good, and the tension test is qualified.

[0054] The riveting completion program after the completion of the first riveting program of the riveting process enables the control to achieve the following: the tail set is retracted, the converging pinch roll and the tail pinch roll are opened, the entry and exit centering backplates are opened, and the unit is tensioned.

[0055] Experimental sample three: the galvanized steel substrate has a steel grade of H420LAD-Z, a thickness of 0.8 mm, and a zinc layer thickness of 100 g / m 2 , the lap length of the operating side is set to 380 mm, the lap length of the driving side is 380 mm, the pressure of the pushing cylinder is 2300 KN, the pressure of the tail set is 1300 daN, the speed of the head and tail of the strip is 25 m / min, the pressure of the flattening machine is 2500 daN, the first riveting starts at 60 mm behind the head of the strip; after riveting, no reinforcing strip 13 is inserted, and the converging pinch roll and the tail pinch roll simultaneously forward the strip at a speed of 30 m / min through the side flattening machine. The obtained riveting joint is tested by the tensioning machine in the form of a unit, and the tensioning machine is set to a large tension of 55 KN to test the riveting joint tension, and the experimental results show that the riveting joint interface does not tear, and the tension test is qualified.

[0056] The riveting completion program after the completion of the first riveting program of the riveting process enables the control to achieve the following: the tail set is retracted, the converging pinch roll and the tail pinch roll are opened, the entry and exit centering backplates are opened, and the unit is tensioned.

[0057] Experimental sample four: the galvanized steel substrate has a steel grade of DX51D-Z, a thickness of 1.6 mm, and a zinc layer thickness of 80 g / m 2The galvanized steel strip substrate sets the operation side overlap amount 350mm, the transmission side overlap amount 350mm, the push oil cylinder pressure 2800KN, the strip tail pick-up pressure 1420daN, the strip head and strip tail strip conveying speed 20m / min, the flattening machine pressure 3200daN, the first riveting starts riveting at 40mm behind the strip head during the riveting process; after riveting, the reinforcing strip 13 is not penetrated, the merging pinch roll and the strip tail pinch roll simultaneously convey the strip steel forward at 15m / min through the side flattening machine. The obtained riveted joint is in the form of the unit building tension, the tension machine sets the tension 55KN to do the riveted joint tensioning, the experimental result is that the riveted joint riveting interface does not have the tearing mouth condition, the riveted joint is locked, and the tension test is qualified.

[0058] The riveting program is completed after the first riveting, and the riveting completion program is completed, so that the control can realize the strip tail pick-up retraction, the merging pinch roll and the strip tail pinch roll opening, the inlet centering abutment and the outlet centering abutment opening, and the unit building tension.

[0059] It can be known from the above examples that the influence of the paint and the zinc layer on the butt joint of the strip steel substrate is solved by adopting the present application, the effective butt joint of the strip head and the strip tail of the color coated strip steel can be realized, the butt joint time and the use of the transition plate are reduced, the riveting seam quality is stable and reliable, the continuous operation of the color coated strip steel unit is realized, and the production capacity is improved.

[0060] Although the preferred embodiments of the present application are described above, the present application is not limited to the above specific embodiments, the above specific embodiments are only illustrative and not restrictive, and those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims. These all belong to the protection scope of the present application.

Claims

1. A device for riveting a prepainted steel strip, characterized in that: The application relates to a strip splicing machine, which comprises a front centering platform, a splicing machine, a rear centering platform and a flattening machine connected in sequence; the splicing machine comprises a mounting frame, a guide column, a riveting die and a hydraulic cylinder arranged in the middle of the mounting frame; the riveting die comprises an upper die and a lower die, and a strip is arranged between the upper die and the lower die; the lower die is lifted under the pushing of the hydraulic cylinder and rivets the strip together with the upper die; a strip tail pinch roll and a strip tail pick-up sleeve are further arranged between the rear centering platform and the flattening machine, and the strip tail pick-up sleeve is controlled by a driving cylinder; a convergence pinch roll provided with an encoder is arranged at the front end of the front centering platform.

2. A device for riveting a color coated steel strip as claimed in claim 1, wherein: The upper die and the lower die are both composed of a die base and a riveting working part, and a plurality of springs are arranged between the die base and the riveting working part; a middle part of the riveting working part of the lower die is provided with two rows of die protrusions, the cross section of the die protrusions is in the shape of a trapezoid as a whole, and the two waists of the die protrusions are fold lines; and a middle part of the riveting working part of the upper die is provided with grooves matched with the die protrusions.

3. A device for riveting a color coated steel strip as claimed in claim 1, wherein: A pressure regulating valve is arranged on the hydraulic cylinder, and an upper limit stroke switch is arranged beside the guide column.

4. The apparatus according to claim 1, wherein: The front centering platform and the rear centering platform both center the strip by a centering back plate.

5. A method of butt joining a prepainted steel strip using the riveting device according to any one of claims 1 to 4, characterized in that, The application further discloses a strip splicing method, which comprises the following steps: S1, precisely cutting a strip head section and a strip tail section; S2, the convergence pinch roll sends the front end of the strip tail section into the strip tail pinch roll and the strip tail pick-up sleeve, and the tail end of the strip tail section stops advancing after passing through a strip tail first detection position located in front of the front centering platform; the strip tail section is continuously sent forward by the strip tail pinch roll until the tail end of the strip tail section passes through a strip tail second detection position located in front of a feeding port of the splicing machine; the strip tail pinch roll stops sending the strip, and the driving cylinder has lifted the strip tail pick-up sleeve; S3, the convergence pinch roll sends the strip head section forward to a strip head detection position located at the outlet of the front centering platform, starts metering when the strip head section reaches the strip head detection position, and stops sending the strip head section after the strip head section is sent forward by a preset length; at this time, the front end of the strip head section enters the splicing machine and overlaps with the tail end of the strip tail section above the lower die; S4, the front centering platform and the rear centering platform push the center lines of the strip head section and the strip tail section to the center of the production line according to the preset width of the strip, so that the centering action is completed; S5, the lower die of the splicing machine is lifted to perform a riveting action under the pushing of the hydraulic cylinder; when the set pressure is reached and the lower die contacts the upper limit stroke switch, the lower die is automatically returned to the original position, and the first riveting action is completed to obtain a plurality of riveting holes in the shape of a trapezoid as a whole and with the two waists being fold lines; when the thickness of the riveted strip is less than 0.35 mm, the strip needs to be riveted twice; the front centering platform and the rear centering platform are opened, and the overlapped strip head section and strip tail section are continuously sent forward by a distance of an overlapping amount; after the strip is sent, the second centering and the second riveting action are performed, and the riveting holes in the shape of a trapezoid as a whole and with the two waists being fold lines are obtained again; S6, after the riveting action is completed, the front centering platform and the rear centering platform are opened, the strip tail pinch roll is opened, the strip tail pick-up sleeve is lowered, the convergence pinch roll is run backward to pull the two strip sections to be flat, the upper and lower splicing incisions of the strip are hung together, the splicing position is sent forward to the flattening machine after the flatting is completed, the splicing position is flattened by the upper roller of the flattening machine, and then the upper roller is lifted, so that the strip butt joint is completed.

6. The butt joining method of the color coated steel strip according to claim 5, characterized in that: The first detection position, the second detection position and the head detection position are respectively equipped with a first sensor, a second sensor and a third sensor, and the stop of the working of the merging pinch roll is controlled by the detection signals sent by the first sensor and the third sensor, the start of the working of the tail pinch roll is controlled by the detection signal sent by the first sensor, and the stop of the working of the tail pinch roll is controlled by the detection signal sent by the second sensor.

7. The butt joining method of the color coated steel strip according to claim 5, characterized in that: In the S2, the tail pinch roll sends the strip steel, the tail pick-up slowly rises, the pick-up platform behind the rear centering platform is lifted, a small loop is formed to store the strip steel sent by the tail pinch roll in the tail pick-up area.

8. The butt joining method of the color coated steel strip according to claim 5, characterized in that: In the S5, the first riveting head is formed after the first riveting, the second riveting head is obtained after the second riveting when the first riveting head leaves the riveting die range, and the first riveting head and the second riveting head are penetrated after the second riveting head leaves the riveting die range.

9. The butt joining method of the color coated steel strip according to claim 8, characterized in that: The penetrating strip is a 7-15mm wide reinforcing strip which is penetrated between the riveting holes formed by the die in the overlapping part of the head and the tail, the length of the reinforcing strip is consistent with the width of the strip steel, and the width of the reinforcing strip is less than the longest opening of the riveting hole along the length direction of the strip steel.

10. The butt joining method of the color coated steel strip according to claim 5, characterized in that: Before the riveting action in the S5, the riveting operation parameters of the sewing machine are set and the overlap is given, the hydraulic cylinder pressure is 800-2800KN, the strip steel conveying speed is 4-30m / min, the tail pick-up pressure is 750-1420daN, the flattening machine pressure is 800-3200daN, the overlap of the operation side of the sewing machine is 260-800mm, and the overlap of the transmission side of the sewing machine is 260-800mm.

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