Direct square longitudinal welded pipe production line

Abstract

The utility model provides a production line for directly forming a square longitudinal welded pipe, which belongs to the technical field of square pipe forming and comprises a feeding rack, a leveling rack, a rough forming rack, a single-side forming rack, a fine forming rack, an extrusion roller rack, a scraping welding rack, a polishing rack, a sizing rack and a square pipe straightening rack which are sequentially arranged along the moving direction of a square pipe. A plurality of rough forming racks are arranged, and a guide rack is arranged between every two adjacent rough forming racks; and a cooling water tank is arranged between the polishing machine frame and the sizing machine frame. According to the rough forming machine frame, the two sides of a steel belt are preliminarily bent, the guide machine frame is arranged between every two adjacent rough forming machine frames, and the steel belt and folded edges are corrected and guided after each time of bending, so that the final forming precision of a square pipe is improved, and the problems that the final error is large and the precision is poor due to accumulative errors are solved; after being polished, the primarily-formed square tube is cooled through the cooling water tank, thermal deformation is eliminated, and the sizing precision of the sizing rack is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of square tube forming, and in particular relates to a production line for directly forming square straight seam welded tubes. Background Art

[0002] The production of square tubes is to directly cold-bend the steel strip into a square tube through a multi-pass forming rack, and then squeeze the steel strip through high-frequency welding so that the two sides of the steel strip are connected to each other to form a closed square tube. The forming is difficult and each process must have a high degree of accuracy, otherwise it is difficult to ensure the dimensional accuracy of the final square tube.

[0003] The current square tube production line layout still has some shortcomings. For example, the deformation during the forming process cannot be corrected in time, making it difficult to ensure the final forming accuracy of the square tube. Utility Model Content

[0004] The embodiment of the utility model provides a production line for directly forming square straight seam welded pipes, aiming to solve the problem of poor forming accuracy in the production of square pipes.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: to provide a direct square straight seam welded pipe production line, including: a feeding rack, a leveling rack, a rough forming rack, a single-side forming rack, a fine forming rack, an extrusion roller rack, a scraping welding rack, a polishing rack, a sizing rack and a square pipe straightening rack arranged in sequence along the moving direction of the square pipe; the rough forming rack is arranged in multiple racks, and a guide rack is arranged between two adjacent rough forming racks; a cooling water tank is arranged between the polishing rack and the sizing rack.

[0006] In one achievable manner, the leveling frame is a seven-roller leveling frame.

[0007] In a feasible manner, the leveling frame is provided with feeding vertical rollers before feeding and after discharging to correct the deviation of the steel strip.

[0008] In one feasible manner, the guide frame includes: a guide frame body, a centering mechanism, two sets of guide lifting mechanisms and two sets of vertical rollers; the centering mechanism includes a centering screw rod rotatably arranged on the guide frame body at both ends and a centering nut screwed on the centering screw rod, and the two centering nuts have opposite rotation directions; the two sets of guide lifting mechanisms include a lifting frame, a lifting screw rod arranged on the lifting frame and a lifting nut connected to the lifting screw rod; the lifting frame is arranged on the centering nut of the centering mechanism; the two sets of vertical rollers are respectively arranged on the lifting nuts of the two sets of guide lifting mechanisms, and the circumferential surfaces of the vertical rollers are provided with annular forming grooves.

[0009] In an achievable manner, the sizing machine frame includes: two groups of sizing stands, a lower roller mechanism, an upper roller mechanism, a left roller mechanism, a right roller mechanism and a sizing lifting mechanism, wherein an upper slider is arranged on the sizing stand; the lower roller mechanism includes a lower roller translation assembly, a lower roller shaft rotatably connected to the sizing stand and a lower pressure roller arranged on the lower roller shaft; the lower roller translation assembly drives the lower pressure roller to move horizontally along the lower roller shaft; the upper roller mechanism includes an upper roller translation assembly, an upper roller shaft rotatably connected to the stand and an upper pressure roller arranged on the upper roller shaft; the upper roller translation assembly drives the upper pressure roller to move horizontally along the upper roller shaft; the upper roller mechanism is arranged on the upper slider; the left roller The mechanism includes a left roller screw, a left roller translation nut matched with the left roller screw and a left pressure roller connected to the left roller translation nut; the left roller mechanism is arranged on the upper slider; the right roller mechanism includes a right roller screw, a right roller translation nut matched with the right roller screw and a right pressure roller connected to the right roller translation nut; the right roller mechanism is located above the left roller mechanism; the sizing lifting mechanism is arranged on the sizing stand, the sizing lifting rod of the sizing lifting mechanism is connected to the upper slider, the sizing lifting mechanism drives the upper roller mechanism and the left roller mechanism to rise and fall, and the upper pressure roller, the left pressure roller, the lower pressure roller and the right pressure roller are staggered to form an extrusion and shaping space for shaping square tubes.

[0010] In one achievable manner, the extrusion roller frame is a five-roller extrusion roller frame, including an extrusion frame body, a roller mechanism, two groups of side roller mechanisms, two groups of upper roller mechanisms and two groups of lifting mechanisms; the extrusion frame body includes a base and an extrusion stand arranged on the base; the extrusion stand is provided with a lifting slide; the roller mechanism is arranged on the base, and the roller mechanism includes rollers; two groups of side roller mechanisms are symmetrically arranged on the lifting slide along the center line of the frame body; the side roller mechanism includes a transverse screw rod, a transverse nut matched with the transverse screw rod and a side roller connected to the transverse nut; two groups of upper roller mechanisms are symmetrically arranged on the lifting slide, and the angle formed by the upper rollers of the two groups of the upper roller mechanisms is an acute angle; the upper roller mechanism includes an upward screw rod, an upward nut matched with the upward screw rod and an upper roller connected to the upward nut; the extrusion lifting rods of the two groups of lifting mechanisms are connected to the lifting slide, driving the side roller mechanism and the upper roller mechanism to rise and fall synchronously.

[0011] In one achievable manner, an upper seat for mounting the lifting mechanism is provided at the top end of the extrusion stand.

[0012] In one achievable manner, a reinforcing plate is provided between the upper seat and the extruded stand.

[0013] In a feasible manner, two vertical guide rails are provided on the extrusion stand, a lifting slider is provided on the vertical guide rails, and the lifting slider is fixed on the lifting slider.

[0014] In one feasible manner, a water spray pipe is arranged above the cooling water trough, and a plurality of water spray holes are arranged on the water spray pipe along the length direction; and a water inlet pipe and a water outlet pipe are arranged on the cooling water trough.

[0015] Compared with the prior art, the direct square straight seam welded pipe production line provided by the utility model has the following beneficial effects: the rough forming frame preliminarily bends the two sides of the steel strip, and the two folded edges form a plane of the square tube after subsequent butt welding; a guide frame is arranged between two adjacent rough forming frames, and after each bending, the steel strip and the folded edges are corrected and guided to ensure that the steel strip formed last time is kept within a small error range before entering the next frame, thereby improving the final forming accuracy of the square tube and avoiding the problem of large final error and poor accuracy caused by cumulative error; at the same time, the preliminarily formed square tube is cooled by a cooling water tank after being polished to eliminate thermal deformation, thereby improving the shaping accuracy of the sizing frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a production line for directly forming square straight seam welded pipes provided in an embodiment of the utility model;

[0017] Figure 2 A schematic structural diagram of the first section of a direct square straight seam welded pipe production line provided by an embodiment of the utility model;

[0018] Figure 3 A schematic diagram of the structure of the second section of a direct square straight seam welded pipe production line provided by an embodiment of the utility model;

[0019] Figure 4 A schematic structural diagram of the third section of a direct square straight seam welded pipe production line provided by an embodiment of the utility model;

[0020] Figure 5 A schematic diagram of the structure of the fourth section of a direct square straight seam welded pipe production line provided by an embodiment of the utility model;

[0021] Figure 6 A schematic diagram of the structure of a guide frame provided in an embodiment of the utility model;

[0022] Figure 7 for Figure 6 A right view structural diagram of the provided guide frame;

[0023] Figure 8 A schematic diagram of the structure of the squeezing roller frame provided in an embodiment of the utility model;

[0024] Fig. 9 for Figure 8 A right side structural schematic diagram of the provided extrusion roller frame;

[0025] Fig.10 A schematic diagram of the structure of a sizing frame provided in an embodiment of the utility model;

[0026] Fig.11 for Fig.10 The structural diagram of the sizing rack provided;

[0027] Description of reference numerals:

[0028] 1. Feeding rack; 2. Leveling rack; 3. Rough forming rack; 4. Guide rack; 41. Guide frame; 42. Centering screw rod; 43. Centering nut; 44. Lifting nut; 45. Lifting screw rod; 46. Vertical plate; 47. Roller rack; 48. Steel belt; 49. Vertical roller; 5. Single-side forming rack; 6. Fine forming rack; 7. Extrusion roller rack; 71. Extrusion vertical rack; 72. Transverse screw rod; 73. Transverse nut; 74. Side rolling roller; 75. Extrusion lifting rod; 76. Upward screw rod; 77. Vertical guide rail; 78. Upper roller box; 79. Lifting slide plate; 791, upper roller; 792, supporting roller; 793, lifting slider; 8, scraping and welding frame; 9, polishing frame; 10, cooling water trough; 11, water spray pipe; 12, sizing frame; 121, sizing stand; 122, left pressure roller; 123, left roller translation nut; 124, left roller screw; 125, upper slider; 126, upper roller screw; 127, sizing lifting rod; 128, right pressure roller; 129, right roller screw; 1291, lower pressure roller; 1292, lower roller shaft; 1293, lower roller screw; 1294, upper pressure roller; 13, square tube straightening frame. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] Please also read Figures 1 to 5 Now, the direct square straight seam welded pipe production line provided by the utility model is described. The direct square straight seam welded pipe production line comprises: a feeding frame 1, a leveling frame 2, a rough forming frame 3, a single-side forming frame 5, a fine forming frame 6, an extrusion roller frame 7, a scraping welding frame 8, a polishing frame 9, a sizing frame 12 and a square pipe straightening frame 13 arranged in sequence along the moving direction of the square pipe; the rough forming frame 3 is arranged in multiple frames, and a guide frame 4 is arranged between two adjacent rough forming frames 3; a cooling water tank 10 is arranged between the polishing frame 9 and the sizing frame 12.

[0031] Compared with the prior art, the direct square straight seam welded pipe production line provided by the utility model has the following beneficial effects: the rough forming frame 3 preliminarily bends the two sides of the steel strip 48, and the two folded edges form a plane of the square pipe after subsequent butt welding. A guide frame 4 is arranged between two adjacent rough forming frames 3. After each bending, the steel strip 48 and the folded edges are corrected and guided to ensure that the steel strip 48 formed last time is kept within a small error range before entering the next frame, thereby improving the final forming accuracy of the square pipe and avoiding the problem of large final error and poor accuracy caused by cumulative error. At the same time, the preliminarily formed square pipe is cooled by the cooling water tank 10 after polishing to eliminate thermal deformation, thereby improving the shaping accuracy of the sizing frame 12.

[0032] In some embodiments, the leveling frame 2 is a seven-roller leveling frame 2, which leveled the fed steel strip 48, improved the straightness of the steel strip 48, and improved the precision of subsequent forming of the steel strip 48.

[0033] In some embodiments, Figure 1 and Figure 2 As shown, the leveling frame 2 is provided with feeding vertical rollers 49 before feeding and after discharging, which are used to correct the deviation of the steel strip 48 to ensure that the center line of the steel strip 48 is centered, thereby providing accuracy guarantee for the initial bending of the subsequent steel strip 48.

[0034] In some embodiments, Figure 6 and Figure 7 As shown, the guide frame 4 includes: a guide frame body 41, a centering mechanism, two sets of guide lifting mechanisms and two sets of vertical rollers 49; the centering mechanism includes a centering screw 42 with two ends rotatably arranged on the guide frame body 41 and a centering nut 43 screwed on the centering screw 42, and the two centering nuts 43 have opposite rotation directions; the two sets of guide lifting mechanisms include a lifting frame, a lifting screw 45 arranged on the lifting frame and a lifting nut 44 connected to the lifting screw 45; the lifting frame is arranged on the centering nut 43 of the centering mechanism; the two sets of vertical rollers 49 are respectively arranged on the lifting nuts 44 of the two sets of guide lifting mechanisms, and the circumferential surfaces of the vertical rollers 49 are provided with annular forming grooves. A guide lifting mechanism capable of driving the vertical rollers 49 to rise and fall is provided, and the guide lifting mechanism is fixed on the centering nut 43 at the same time, and can move in the same direction or opposite direction with the centering nut 43. Through the centering mechanism, the distance between the two sets of vertical rollers 49 can be adjusted to meet the forming requirements of square tubes of different specifications; through the guide lifting mechanism, the vertical rollers 49 are driven to rise and fall to meet the forming requirements of square tubes of different specifications. Through the adjustment for square tubes of different specifications, not only the quality of square tube forming can be improved, but also the application range of the vertical roller 49 frame is greatly improved.

[0035] The lifting frame includes a vertical plate 46 , and a vertical roller 49 is connected to a lifting nut via a roller support frame 47 .

[0036] The annular forming groove of the guide frame 4 is a V-shaped structure, and the ends of the folded edges on both sides of the steel belt 48 abut against the oblique sides of the V-shape, which has the function of correcting and guiding the folded edges and the steel belt 48. This embodiment reduces the error of each process, thereby reducing the cumulative error of the final product and improving the accuracy of the terminal product.

[0037] In some embodiments, Fig.10 and Fig.11 As shown, the sizing frame 12 includes: two groups of sizing frames 121, a lower roller mechanism, an upper roller mechanism, a left roller mechanism, a right roller mechanism and a sizing lifting mechanism, and an upper slider 125 is arranged on the sizing frame 121; the lower roller mechanism includes a lower roller translation assembly, a lower roller shaft 1292 rotatably connected to the sizing frame 121, and a lower pressure roller 1291 arranged on the lower roller shaft 1292; the lower roller translation assembly drives the lower pressure roller 1291 to move horizontally along the lower roller shaft 1292, and the lower roller translation assembly includes a lower roller screw rod 1293; the upper roller mechanism includes an upper roller translation assembly, an upper roller shaft rotatably connected to the frame, and an upper pressure roller 1294 arranged on the upper roller shaft; the upper roller translation assembly drives the upper pressure roller 1294 to move horizontally along the upper roller shaft; the upper roller mechanism is arranged on the upper slider 125, and the upper roller translation assembly drives the upper pressure roller 1294 to move horizontally along the upper roller shaft. The assembly includes an upper roller screw 126; the left roller mechanism includes a left roller screw 124, a left roller translation nut 123 matched with the left roller screw 124, and a left pressure roller 122 connected to the left roller translation nut 123; the left roller mechanism is arranged on the upper slider 125; the right roller mechanism includes a right roller screw 129, a right roller translation nut matched with the right roller screw 129, and a right pressure roller 128 connected to the right roller translation nut; the right roller mechanism is located above the left roller mechanism; the sizing lifting mechanism is arranged on the sizing stand 121, the sizing lifting rod 127 of the sizing lifting mechanism is connected to the upper slider 125, the sizing lifting mechanism drives the upper roller mechanism and the left roller mechanism to rise and fall, and the upper pressure roller 1294, the left pressure roller 122, the lower pressure roller 1291 and the right pressure roller 128 are staggered to form an extrusion and shaping space for shaping square tubes.

[0038] The lower pressure roller 1291, the left pressure roller 122, the right pressure roller 128 and the upper pressure roller 1294 of the sizing machine frame 12 provided in the embodiment of the utility model can all be translated in the horizontal direction, and the left pressure roller 122 and the upper pressure roller 1294 can be raised and lowered in the up and down directions, so that the extrusion shaping space can be accurately adjusted according to square tubes of different specifications, thereby improving the forming accuracy of the square tubes.

[0039] In some embodiments, Figure 8 and Fig. 9As shown, the extrusion roller frame 7 is a five-roller extrusion roller frame 7, including an extrusion frame body, a roller support mechanism, two sets of side roller mechanisms, two sets of upper roller mechanisms and two sets of lifting mechanisms; the extrusion frame body includes a base and an extrusion stand 71 arranged on the base; a lifting slide 79 is arranged on the extrusion stand 71; the roller support mechanism is arranged on the base, and the roller support mechanism includes rollers 792; two sets of side roller mechanisms are symmetrically arranged on the lifting slide 79 along the center line of the frame body; the side roller mechanism includes a transverse screw rod 72, which cooperates with the transverse screw rod 72 to move the rollers. The lateral nut 73 on the screw rod 72 and the side roller 74 connected to the lateral nut 73; the two sets of upper roller mechanisms are symmetrically arranged on the lifting slide 79, and the angle formed by the upper rollers 791 of the two sets of upper roller mechanisms is an acute angle; the upper roller mechanism includes an upward screw rod 76, an upward nut matched with the upward screw rod 76, and an upper roller 791 connected to the upward nut; the extrusion lifting rod 75 of the two sets of lifting mechanisms is connected to the lifting slide 79, driving the side roller mechanism and the upper roller mechanism to rise and fall synchronously. Among them, the upper roller 791 in the upper roller mechanism is arranged in the upper roller box 78.

[0040] Compared with the prior art, the five-roller extrusion roller frame 7 provided by the utility model has the following beneficial effects: the side rollers 74 and the two upper rollers 791 on both sides have the ability to move horizontally to the left and right and adjust the position up and down, and they also have the ability to move up and down at the same time under the action of the lifting mechanism. The lifting mechanism can realize the synchronous and rapid adjustment of the positions of the side roller mechanism and the upper roller mechanism as a whole, and the adjustment of the respective lateral movement and up and down positions can be fine-tuned according to actual conditions. The five-roller extrusion roller frame 7 provided by the utility model can be quickly adjusted according to the specifications of the square tube, and the side rollers 74 and the upper rollers 791 can be fine-tuned according to actual conditions to ensure the forming accuracy, so as to adapt to the production requirements of square tubes of different specifications, without the need to replace the rollers, which not only improves the production efficiency, but also improves the forming accuracy of the square tube.

[0041] In some embodiments, Figure 8 and Fig. 9 As shown, the top end of the extrusion stand 71 is provided with an upper seat for mounting a lifting mechanism.

[0042] In some embodiments, Figure 8 and Fig. 9 As shown, a first reinforcing plate is provided between the upper seat and the extrusion stand 71 to enhance the supporting strength of the lifting mechanism.

[0043] In some embodiments, Figure 8 and Fig. 9 As shown, two vertical guide rails 77 are provided on the extrusion stand 71 , a lifting slider 793 is provided on the vertical guide rail 77 , and a lifting slide plate 79 is fixed on the lifting slider 793 .

[0044] In some embodiments, Figure 1 and Figure 3 As shown, a water spray pipe 11 is arranged above the cooling water tank 10, and a plurality of water spray holes are arranged on the water spray pipe 11 along the length direction; a water inlet pipe and a water outlet pipe are arranged on the cooling water tank 10. The initially formed square tube is cooled by the cooling water tank 10 to eliminate the thermal deformation of the square tube, so as to ensure that the square tube has accurate size parameters when entering the next process, improve the accuracy of the sizing process, and thus ensure the final accuracy of the product.

[0045] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A direct square straight seam welded pipe production line, characterized in that: include: A feeding rack (1), a leveling rack (2), a rough forming rack (3), a single-side forming rack (5), a fine forming rack (6), an extrusion roller rack (7), a scraping welding rack (8), a polishing rack (9), a sizing rack (12) and a square tube straightening rack (13) are sequentially arranged along the moving direction of the square tube; the rough forming rack (3) is arranged in a plurality of racks, and a guide rack (4) is arranged between two adjacent rough forming racks (3); a cooling water tank (10) is arranged between the polishing rack (9) and the sizing rack (12).

2. The direct square straight seam welded pipe production line according to claim 1 is characterized in that: The leveling frame (2) is a seven-roller leveling frame (2).

3. The direct square straight seam welded pipe production line according to claim 1 is characterized in that: The leveling frame (2) is provided with feeding vertical rollers (49) before feeding and after discharging, which are used to correct the deviation of the steel strip (48).

4. The direct square straight seam welded pipe production line according to claim 1 is characterized in that: The guide frame (4) comprises: a guide frame body (41), a centering mechanism, two sets of guide lifting mechanisms and two sets of vertical rollers (49); the centering mechanism comprises a centering screw (42) rotatably arranged on the guide frame body (41) at both ends and a centering nut (43) screwed on the centering screw (42), and the two centering nuts (43) have opposite rotation directions; the two sets of guide lifting mechanisms comprise a lifting frame, a lifting screw (45) arranged on the lifting frame and a lifting nut (44) connected to the lifting screw (45); the lifting frame is arranged on the centering nut (43) of the centering mechanism; the two sets of vertical rollers (49) are respectively arranged on the lifting nuts (44) of the two sets of guide lifting mechanisms, and the circumferential surfaces of the vertical rollers (49) are provided with annular forming grooves.

5. The direct square straight seam welded pipe production line according to claim 1 is characterized in that: The sizing machine frame (12) comprises: two groups of sizing frames (121), a lower roller mechanism, an upper roller mechanism, a left roller mechanism, a right roller mechanism and a sizing lifting mechanism, wherein an upper slider (125) is arranged on the sizing frame (121); the lower roller mechanism comprises a lower roller translation assembly, a lower roller shaft (1292) rotatably connected to the sizing frame (121) and a lower pressure roller (1291) arranged on the lower roller shaft (1292); the lower roller translation assembly drives the lower pressure roller (1291) to move horizontally along the lower roller shaft (1292); the upper roller mechanism comprises an upper roller translation assembly, an upper roller shaft rotatably connected to the frame and an upper pressure roller (1294) arranged on the upper roller shaft; the upper roller translation assembly drives the upper pressure roller (1294) to move horizontally along the upper roller shaft; the upper roller mechanism is arranged on the upper slider (125); the left roller mechanism comprises a left roller screw (12 4), a left roller translation nut (123) matched with the left roller screw (124) and a left pressure roller (122) connected to the left roller translation nut (123); the left roller mechanism is arranged on the upper slider (125); the right roller mechanism includes a right roller screw (129), a right roller translation nut matched with the right roller screw (129) and a right pressure roller (128) connected to the right roller translation nut; the right roller mechanism is located above the left roller mechanism; a sizing lifting mechanism is arranged on the sizing stand (121), the sizing lifting rod (127) of the sizing lifting mechanism is connected to the upper slider (125), the sizing lifting mechanism drives the upper roller mechanism and the left roller mechanism to rise and fall, and the upper pressure roller (1294), the left pressure roller (122), the lower pressure roller (1291) and the right pressure roller (128) are staggered to form an extrusion and shaping space for shaping the square tube.

6. The direct square straight seam welded pipe production line according to claim 1 is characterized in that: The extrusion roller frame (7) is a five-roller extrusion roller frame (7), comprising an extrusion frame body, a roller support (792) mechanism, two sets of side roller mechanisms, two sets of upper roller mechanisms and two sets of lifting mechanisms; the extrusion frame body comprises a base and an extrusion stand (71) arranged on the base; a lifting slide plate (79) is arranged on the extrusion stand (71); the roller support (792) mechanism is arranged on the base, and the roller support (792) mechanism comprises a roller support (792); two sets of side roller mechanisms are symmetrically arranged on the lifting slide plate (79) along the center line of the frame body; the side roller mechanism comprises a transverse screw rod (72), a screw rod (72) and a screw rod (72) which cooperates with the screw rod (72) to move the rollers. The transverse nut (73) on the transverse screw rod (72) and the side roller (74) connected to the transverse nut (73); two sets of upper roller mechanisms are symmetrically arranged on the lifting slide plate (79), and the angle formed by the upper rollers (791) of the two sets of upper roller mechanisms is an acute angle; the upper roller mechanism includes an upper screw rod (76), an upper nut matched with the upper screw rod (76) and an upper roller (791) connected to the upper nut; the extrusion lifting rods (75) of the two sets of lifting mechanisms are connected to the lifting slide plate (79), driving the side roller mechanism and the upper roller mechanism to rise and fall synchronously.

7. The direct square straight seam welded pipe production line according to claim 6 is characterized in that: The top end of the extrusion stand (71) is provided with an upper seat for installing the lifting mechanism.

8. The direct square straight seam welded pipe production line according to claim 7 is characterized in that: A reinforcing plate is provided between the upper seat and the extrusion stand (71).

9. The direct square straight seam welded pipe production line according to claim 6, characterized in that: Two vertical guide rails are arranged on the extrusion stand (71), a lifting slide block (793) is arranged on the vertical guide rail, and the lifting slide block (79) is fixed on the lifting slide block (793).

10. The direct square straight seam welded pipe production line according to claim 1, characterized in that: A water spray pipe (11) is arranged above the cooling water trough (10), and a plurality of water spray holes are arranged on the water spray pipe (11) along the length direction; and a water inlet pipe and a water outlet pipe are arranged on the cooling water trough (10).

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