A new type of tension levelling device

Abstract

The application discloses a novel tension straightening equipment and relates to the field of metal processing. The novel tension straightening equipment comprises a workbench, a first tension unit, a cylinder straightening unit, a second tension unit, a first driving unit, a second driving unit and a driving auxiliary unit. Steel pipe workpieces conveyed by the first tension unit enter the cylinder straightening unit to complete straightening work. The second driving unit can simultaneously drive the first tension unit and the second tension unit to transmit power. The driving auxiliary unit is connected with the second driving unit. The novel tension straightening equipment can adjust the driving tension of the second driving unit in real time according to the tension adjustment condition of the tension unit, avoids problems such as driving slip and unstable power transmission, ensures continuous and stable operation of the equipment, and improves the processing stability and reliability of the equipment as a whole.

Description

Technical Field

[0001] This invention relates to the field of steel pipe processing, and in particular to a novel tension straightening device. Background Technology

[0002] In the field of steel pipe workpiece processing, tension straightening is a key process for achieving shape correction and eliminating residual stress in steel pipe workpieces. Its core is to use the synergistic effect of tension mechanism and straightening mechanism to make steel pipe workpieces produce uniform plastic elongation, thereby eliminating shape defects such as bending and wavy shape, and ensuring the accuracy of subsequent processing and product quality.

[0003] Currently available tension straightening equipment generally suffers from insufficient coordination between the tension mechanism and the straightening mechanism, specifically manifested as follows:

[0004] The feeding tension mechanism and the discharging tension mechanism are difficult to keep in sync, which causes tension fluctuations in small-diameter steel pipes before they enter the straightening mechanism, or causes pulling, loosening, axial movement and other phenomena when they are discharged after straightening. This can easily cause scratches on the pipe wall, end deformation and straightness exceeding the standard.

[0005] Meanwhile, when the tensioning mechanism adjusts the clamping tension according to the outer diameter and wall thickness of the steel pipe, the central axis of the steel pipe is prone to shift. This makes it impossible for small-diameter steel pipes to be accurately aligned with the straightening channel when they enter the straightening mechanism, which in turn leads to a decrease in straightening accuracy. Problems such as bending and springback, excessive ovality, uneven wall thickness, and local out-of-roundness still exist after the steel pipe is straightened, which cannot meet the stringent requirements of straightness, roundness, and surface quality for high-end precision small-diameter steel pipe processing.

[0006] Furthermore, during high-speed rotation, the internal straightening components of the straightening mechanism are prone to loosening, further affecting the straightening stability. The drive mechanism cannot adapt to the tension changes in a timely manner after the tension mechanism is adjusted, which can easily lead to drive slippage, unstable power transmission, and other problems. This can easily cause the steel pipe to shake, jam, and scratch the inner wall, which seriously restricts the product qualification rate of the tension straightening equipment. There is an urgent need for a new type of tension straightening equipment that can solve the above-mentioned problems of poor coordination and insufficient precision. Summary of the Invention

[0007] The purpose of this invention is to provide a novel tension straightening device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a novel tension straightening device, comprising:

[0009] Workbench;

[0010] The first tension unit is installed above the worktable and is used to drive the steel pipe workpiece to move horizontally.

[0011] The cylindrical straightening unit is located at the discharge end of the first tension unit. The steel pipe workpiece conveyed by the first tension unit enters the cylindrical straightening unit to complete the straightening operation.

[0012] The second tension unit is located at the discharge end of the cylindrical straightening unit and is used to clamp the straightened steel pipe workpiece and stably convey it outward.

[0013] The first drive unit is connected to the cylindrical straightening unit and drives the cylindrical straightening unit to rotate, thereby realizing the straightening process of the steel pipe workpiece.

[0014] The second drive unit can simultaneously drive the first tension unit and the second tension unit to ensure that the conveying rhythm of the two tension units is synchronized.

[0015] The drive auxiliary unit is connected to the second drive unit. After the first tension unit and the second tension unit perform self-adjustment of the conveying tension of the steel pipe workpiece, the drive auxiliary unit adjusts the drive tension of the second drive unit to ensure the driving process.

[0016] Preferably, the first tension unit and the second tension unit have the same structure, both including a conveyor frame and an upper sliding seat and a lower sliding seat slidably disposed inside the conveyor frame. An upper tension wheel and a lower tension wheel are respectively rotatably disposed on the front of the upper sliding seat and the lower sliding seat. An arc-shaped fitting groove is opened on the outer circumference of the upper tension wheel and the lower tension wheel. The steel pipe workpiece is clamped between the arc-shaped fitting grooves of the upper tension wheel and the lower tension wheel to achieve stable conveying. Two guide cylinders are also fixedly installed on the front of the conveyor frame, and the two guide cylinders are located on both sides of the middle part of the upper tension wheel and the lower tension wheel to guide and limit the feeding and discharging direction of the steel pipe workpiece.

[0017] Preferably, a first cylinder is fixedly installed on the top of the conveyor frame. The output shaft of the first cylinder passes through the top of the conveyor frame and is fixedly installed on the top of the upper sliding seat. A synchronous drive assembly is provided inside the conveyor frame. When the first cylinder drives the upper sliding seat to move vertically, the synchronous drive assembly synchronously drives the lower sliding seat to move in the opposite direction. When adjusting the distance between the upper tension wheel and the lower tension wheel, it can ensure that the axial position of the steel pipe workpiece remains unchanged. A laser transmitting end is fixedly installed on the back of the conveyor frame, and laser receiving ends are installed on the sides of both the upper and lower sliding seats. Through the cooperation of the laser transmitting end and the laser receiving end, accurate detection of the moving distance of the upper and lower sliding seats can be achieved.

[0018] Preferably, the synchronous drive assembly includes a sliding groove formed on the inner wall of the conveyor frame. Two sliding blocks are slidably connected to the inner wall of the sliding groove, and the two sliding blocks are respectively fixedly connected to the sides of the upper sliding seat and the lower sliding seat. An upper rack and a lower rack are respectively fixedly connected to the two sliding blocks, and a gear is meshed between the upper rack and the lower rack. The synchronous reverse movement of the two sliding blocks is realized through the meshing of the gear with the upper rack and the lower rack.

[0019] Preferably, the cylindrical straightening unit includes a cylindrical body and a bearing seat. The cylindrical body is rotatably mounted above the worktable via the bearing seat. Multiple through-hole straightening slots are formed on the outer side of the cylindrical body, and a conveying cavity communicating with the multiple straightening slots is formed between the two ends of the cylindrical body. Straightening blocks are inserted into the straightening slots. Bolts are threaded to both ends of the straightening slots. The ends of two bolts abut against the ends of the straightening blocks, and the inner side of the bolt heads abuts against the outer side of the cylindrical body. Positioning rods are provided on the outer side of the heads of multiple bolts on the same side. The two ends of the positioning rods are bent towards the cylindrical body and fitted with fixing blocks. The fixing blocks are fixedly installed on the outer side of the cylindrical body, and pins are inserted between the ends of the positioning rods and the fixing blocks. Through the cooperation of the positioning rods and pins, the multiple bolts on the same side are positioned to prevent the bolts from loosening during the rotation of the cylindrical body.

[0020] Preferably, the straightening block has a cylindrical straightening channel inside, and both sides of the straightening block have conical grooves that communicate with the straightening channel. The conical grooves are used to guide the steel pipe workpiece when it enters and exits the straightening channel. Guide blocks are fixedly inserted into the inner walls of both ends of the conveying cavity. The axes of the guide blocks, the straightening channel and the conical grooves are coincident. The steel pipe workpiece passes through the guide blocks, the straightening channel and the conical grooves.

[0021] Preferably, the first drive unit includes a first drive motor fixedly installed below the workbench surface, a first pulley fixedly sleeved on the output end of the first drive motor, a second pulley fixedly sleeved on the outer side of the cylindrical body, and a first transmission belt sleeved between the first pulley and the second pulley.

[0022] Preferably, the second drive unit includes a second drive motor fixedly installed below the worktable surface, a support base fixedly connected above the worktable, a drive shaft fixedly inserted inside the lower tension wheel, and the end of the drive shaft passing through the lower sliding seat.

[0023] Preferably, the output end of the second drive motor is fixedly fitted with a first transmission wheel, and the transmission shafts of the first tension unit and the second tension unit are respectively fixedly fitted with a second transmission wheel and a third transmission wheel. The outer side of the support base is rotatably connected to two fourth transmission wheels. A second transmission belt is connected between the first transmission wheel, the second transmission wheel, the third transmission wheel and the two fourth transmission wheels. When the second drive motor drives the first transmission wheel to rotate, the two fourth transmission wheels simultaneously drive the second transmission wheel and the third transmission wheel to rotate.

[0024] Preferably, the drive auxiliary unit includes a second cylinder fixedly installed on the outside of the support base. An auxiliary frame is fixedly connected to the top of the support base. A movable block is slidably arranged on the inner wall of the auxiliary frame. A belt tension wheel rotates on the outside of the movable block. A connecting block is fixedly connected between the output end of the second cylinder and the bottom of the movable block. Anti-detachment grooves are opened on the outside of the first transmission wheel, the second transmission wheel, the third transmission wheel, the two fourth transmission wheels, and the belt tension wheel. The second transmission belt is driven between multiple anti-detachment grooves. The movable block is driven up and down by the connecting block driven by the second cylinder, thereby adjusting the height of the belt tension wheel and realizing the adjustment of the tension of the second transmission belt.

[0025] The technical effects and advantages of this invention are as follows:

[0026] 1. This novel tension straightening equipment employs a first tension unit and a second tension unit to respectively drive the feeding and clamping of steel pipe workpieces. The second drive unit synchronizes the conveying rhythm of the two tension units, effectively preventing tension fluctuations, pulling, loosening, axial movement, and pipe wall indentations during the conveying process, ensuring the stability of the steel pipe workpiece conveying. The cylindrical straightening unit works in conjunction with the first drive unit to achieve efficient straightening of the steel pipe workpiece, improving the straightness and roundness correction efficiency. The drive auxiliary unit can adjust the driving tension of the second drive unit in real time according to the tension adjustment of the tension units, avoiding problems such as drive slippage and unstable power transmission, ensuring continuous and stable operation of the equipment, and improving the overall processing stability and reliability of the equipment.

[0027] 2. In this novel tension straightening device, the output shaft of the second cylinder extends and retracts, causing the connecting block fixedly connected to the bottom of the moving block to move synchronously. The connecting block drives the moving block to slide up and down along the inner wall of the auxiliary frame. When the moving block moves, it drives the belt tension wheel rotatably connected to its outer side to move up and down synchronously. The belt tension wheel adjusts the tension of the second transmission belt by contacting it, thereby regulating the tension of the second transmission belt. Throughout the process, the anti-detachment grooves on the outer side of the first transmission wheel, second transmission wheel, third transmission wheel, two fourth transmission wheels, and belt tension wheel can prevent the second transmission belt from falling off, ensuring transmission stability and ensuring that the second drive unit can stably drive the first tension unit and the second tension unit without affecting the transmission. This provides stable and uniform conveying power for the steel pipe workpiece, avoiding shaking, jamming, and scratching of the inner wall. Attached Figure Description

[0028] Figure 1 This is a front view of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the rear side of the overall structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the cylindrical straightening unit and the first driving unit of the present invention;

[0031] Figure 4 This is a partial structural schematic diagram of the cylindrical straightening unit of the present invention;

[0032] Figure 5 For the present invention Figure 4 Structural sectional view;

[0033] Figure 6 This is a cross-sectional view of the cylindrical body of the present invention;

[0034] Figure 7 This is a cross-sectional view of the straightening block of the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of the first tension unit, the second tension unit, the second driving unit, and the driving auxiliary unit of the present invention;

[0036] Figure 9 This is a front structural diagram of the first tension unit of the present invention;

[0037] Figure 10 This is a schematic diagram of the back structure of the first tension unit of the present invention;

[0038] Figure 11 This is a cross-sectional view of the conveyor frame of the present invention;

[0039] Figure 12 For the present invention Figure 11Enlarged diagram of part A in the diagram;

[0040] Figure 13 This is a schematic diagram of the structure of the second driving unit and the driving auxiliary unit of the present invention;

[0041] Figure 14 This is a schematic diagram of the structure of the drive auxiliary unit of the present invention.

[0042] In the diagram: 1. Workbench; 2. First tension unit; 21. Conveyor frame; 211. Guide cylinder; 22. Upper sliding seat; 221. Upper tension wheel; 23. Lower sliding seat; 231. Lower tension wheel; 232. Drive shaft; 24. First cylinder; 25. Laser transmitter; 251. Laser receiver; 26. Synchronous drive assembly; 261. Sliding groove; 262. Sliding block; 263. Upper rack; 264. Lower rack; 265. Gear; 3. Cylinder straightening unit; 31. Cylinder body; 311. Straightening groove; 312. Conveying cavity; 32. Bearing seat; 33. Straightening block; 331. Straightening channel; 3 32. Conical groove; 34. Bolt; 35. Positioning rod; 36. Fixing block; 37. Guide block; 4. Second tension unit; 5. First drive unit; 51. First drive motor; 52. First pulley; 53. Second pulley; 54. First transmission belt; 6. Second drive unit; 61. Second drive motor; 62. Support base; 63. First transmission wheel; 64. Second transmission wheel; 65. Third transmission wheel; 66. Fourth transmission wheel; 67. Second transmission belt; 7. Drive auxiliary unit; 71. Second cylinder; 72. Auxiliary frame; 73. Moving block; 74. Belt tension wheel; 75. Connecting block. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] This invention provides, for example Figures 1-14 The novel tension straightening device shown includes:

[0045] Workbench 1;

[0046] The first tension unit 2 is installed above the worktable 1 and is used to drive the steel pipe workpiece to move horizontally.

[0047] The cylindrical straightening unit 3 is located at the discharge end of the first tension unit 2. The steel pipe workpiece conveyed by the first tension unit 2 enters the cylindrical straightening unit 3 to complete the straightening operation.

[0048] The second tension unit 4 is located at the discharge end of the cylindrical straightening unit 3 and is used to clamp the straightened steel pipe workpiece and stably convey it outward.

[0049] The first driving unit 5 is connected to the cylindrical straightening unit 3 in a transmission manner, and drives the cylindrical straightening unit 3 to rotate, thereby realizing the straightening process of the steel pipe workpiece.

[0050] The second drive unit 6 can simultaneously drive the first tension unit 2 and the second tension unit 4 to ensure that the conveying rhythm of the two tension units is synchronized.

[0051] The drive auxiliary unit 7 is connected to the second drive unit 6. After the first tension unit 2 and the second tension unit 4 perform self-adjustment of the conveying tension of the steel pipe workpiece, the drive auxiliary unit 7 adjusts the driving tension of the second drive unit 6 to ensure the driving process.

[0052] After the equipment is started, the second drive unit 6 synchronously drives the first tension unit 2 and the second tension unit 4 to start operating. The steel pipe workpiece to be straightened is fed into the first tension unit 2. The first tension unit 2 clamps the steel pipe workpiece and drives it to move horizontally, smoothly conveying the steel pipe workpiece to the cylindrical straightening unit 3. At the same time, the first drive unit 5 is connected to the cylindrical straightening unit 3 and drives the cylindrical straightening unit 3 to rotate continuously. After the steel pipe workpiece enters the cylindrical straightening unit 3, it completes the straightening operation under the rotation of the cylindrical straightening unit 3. After the straightening is completed, the steel pipe workpiece enters the second tension unit 4, which stably clamps it and conveys it outward in a rhythm synchronized with the first tension unit 2. During the entire conveying and straightening process, after the first tension unit 2 and the second tension unit 4 self-adjust the conveying tension according to the specifications of the steel pipe workpiece, the drive auxiliary unit 7 synchronously adjusts the driving tension of the second drive unit 6 to ensure stable power transmission of the second drive unit 6 and ensure the continuous operation of the entire equipment.

[0053] The first tension unit 2 and the second tension unit 4 are used to drive the feeding and clamping of the steel pipe workpiece, respectively. The second drive unit 6 is used to synchronize the conveying rhythm of the two tension units, effectively avoiding tension fluctuations, pulling or loosening of the steel pipe workpiece during the conveying process, and ensuring the smoothness of the steel pipe workpiece conveying. The cylindrical straightening unit 3 works with the first drive unit 5 to achieve efficient straightening of the steel pipe workpiece and improve straightening efficiency. The drive auxiliary unit 7 can adjust the drive tension of the second drive unit 6 in real time according to the tension adjustment of the tension units, avoiding problems such as drive slippage and unstable power transmission, ensuring continuous and stable operation of the equipment, improving the overall processing stability and reliability of the equipment, and solving the core problem of poor compatibility and insufficient coordination between tension units and drive units in traditional equipment.

[0054] Furthermore, the first tension unit 2 and the second tension unit 4 have the same structure, both including a conveyor frame 21 and an upper sliding seat 22 and a lower sliding seat 23 slidably disposed inside the conveyor frame 21. The upper sliding seat 22 and the lower sliding seat 23 are respectively rotatably disposed on the front side of the upper tension wheel 221 and the lower tension wheel 231. The outer circumferential of the upper tension wheel 221 and the lower tension wheel 231 are provided with arc-shaped fitting grooves. The steel pipe workpiece is clamped between the arc-shaped fitting grooves of the upper tension wheel 221 and the lower tension wheel 231 to achieve stable conveying. Two guide cylinders 211 are also fixedly installed on the front side of the conveyor frame 21, and the two guide cylinders 211 are located on both sides of the middle part of the upper tension wheel 221 and the lower tension wheel 231 to guide and limit the feeding and discharging direction of the steel pipe workpiece.

[0055] When the first tension unit 2 and the second tension unit 4 are working, the steel pipe workpiece first passes through the guide cylinder 211 on one side of the front of the conveyor frame 21. After the guide cylinder 211 guides and limits the feeding direction of the steel pipe workpiece, it enters between the upper tension wheel 221 on the upper sliding seat 22 and the lower tension wheel 231 on the lower sliding seat 23. The arc-shaped fitting grooves on the outer sides of the upper tension wheel 221 and the lower tension wheel 231 precisely clamp the steel pipe workpiece. Under the drive of the second drive unit 6, the upper tension wheel 221 and the lower tension wheel 231 rotate synchronously, driving the steel pipe workpiece to move in the horizontal direction. After the steel pipe workpiece is clamped and conveyed by the upper tension wheel 221 and the lower tension wheel 231, it passes through the guide cylinder 211 on the other side of the front of the conveyor frame 21. The guide cylinder 211 guides and limits the discharge direction again, ensuring that the steel pipe workpiece is always conveyed to the next unit in the set direction.

[0056] Furthermore, a first cylinder 24 is fixedly installed on the top of the conveyor frame 21. The output shaft of the first cylinder 24 passes through the top of the conveyor frame 21 and is fixedly installed on the top of the upper sliding seat 22. A synchronous drive assembly 26 is provided inside the conveyor frame 21. When the first cylinder 24 drives the upper sliding seat 22 to move vertically, the synchronous drive assembly 26 synchronously drives the lower sliding seat 23 to move in the opposite direction. When adjusting the distance between the upper tension wheel 221 and the lower tension wheel 231, it can ensure that the axial position of the steel pipe workpiece remains unchanged. A laser transmitting end 25 is fixedly installed on the back of the conveyor frame 21, and laser receiving ends 251 are installed on the sides of both the upper sliding seat 22 and the lower sliding seat 23. Through the cooperation of the laser transmitting end 25 and the laser receiving end 251, the accurate detection of the moving distance of the upper sliding seat 22 and the lower sliding seat 23 can be achieved.

[0057] When it is necessary to adjust the distance between the upper tension wheel 221 and the lower tension wheel 231 or adjust the conveying tension according to the specifications of the steel pipe workpiece, the first cylinder 24 at the top of the conveyor frame 21 is activated. The output shaft of the first cylinder 24 extends and retracts, driving the upper sliding seat 22 to move vertically along the inside of the conveyor frame 21. When the upper sliding seat 22 moves, it drives the synchronous drive component 26 inside the conveyor frame 21 to move. The synchronous drive component 26 drives the lower sliding seat 23 to move vertically in the opposite direction to the upper sliding seat 22, so that the distance between the upper tension wheel 221 and the lower tension wheel 231 is adjusted synchronously. This enables the first tension unit 2 and the second tension unit 4 to adjust the conveying tension of the steel pipe workpiece. During this adjustment process, the axial position of the steel pipe workpiece remains unchanged, ensuring that it always coincides with the axis of the cylindrical straightening unit 3.

[0058] Simultaneously, the adjustment process of the first tension unit 2 and the second tension unit 4 is monitored using the laser transmitter 25 and the laser receiver 251. The laser transmitter 25 on the back of the conveyor frame 21 continuously emits laser light, and the laser receiver 251 on the sides of the upper sliding seat 22 and the lower sliding seat 23 receives the laser signal. Through the cooperation of the two, the moving distance of the upper sliding seat 22 and the lower sliding seat 23 is accurately detected to ensure that the spacing and tension adjustment accuracy meet the processing requirements of the steel pipe workpiece, while ensuring that the axis of the steel pipe workpiece coincides with the axis of the cylindrical straightening unit 3.

[0059] The first cylinder 24 provides stable power for the movement of the upper sliding seat 22. In conjunction with the synchronous drive assembly 26, it enables the synchronous reverse movement of the upper sliding seat 22 and the lower sliding seat 23. This not only allows for adjustable conveying tension of the steel pipe workpiece by the first tension unit 2 and the second tension unit 4, but also ensures that the axial position of the steel pipe workpiece remains unchanged during adjustment, aligning it with the axis of the cylindrical straightening unit 3. This guarantees a stable straightening effect of the straightening channel 331 on the steel pipe workpiece, preventing deviation between the front and straightening sections and effectively improving straightening accuracy. The cooperation between the laser transmitter 25 and the laser receiver 251 enables precise monitoring of the adjustment process of the first tension unit 2 and the second tension unit 4. This allows for precise control of the distance between the upper tension wheel 221 and the lower tension wheel 231, adapting to the clamping and conveying needs of steel pipe workpieces of different specifications while avoiding damage to the workpiece or slippage caused by excessive or insufficient spacing. This improves the equipment's versatility and processing accuracy.

[0060] Furthermore, the synchronous drive assembly 26 includes a sliding groove 261 formed on the inner wall of the conveyor frame 21. Two sliding blocks 262 are slidably connected to the inner wall of the sliding groove 261, and the two sliding blocks 262 are fixedly connected to the sides of the upper sliding seat 22 and the lower sliding seat 23, respectively. An upper rack 263 and a lower rack 264 are fixedly connected to the two sliding blocks 262, and a gear 265 is meshed between the upper rack 263 and the lower rack 264. Through the meshing and cooperation of the gear 265 with the upper rack 263 and the lower rack 264, the synchronous reverse movement of the two sliding blocks 262 is realized.

[0061] When the first cylinder 24 drives the upper sliding seat 22 to move vertically, the upper sliding seat 22 drives the sliding block 262 fixedly connected to it to slide along the sliding groove 261 on the inner wall of the conveyor frame 21. The sliding block 262 drives the upper rack 263 fixedly connected to it to move synchronously. When the upper rack 263 moves, it drives the gear 265 meshing with it to rotate. When the gear 265 rotates, it drives the lower rack 264 meshing with it to move in the opposite direction. The lower rack 264 drives another sliding block 262 fixedly connected to it to slide along the sliding groove 261. The sliding block 262 drives the lower sliding seat 23 to move synchronously, thus realizing the synchronous reverse movement of the upper sliding seat 22 and the lower sliding seat 23.

[0062] Furthermore, the cylindrical straightening unit 3 includes a cylindrical body 31 and a bearing seat 32. The cylindrical body 31 is rotatably mounted above the worktable 1 via the bearing seat 32. Multiple through straightening grooves 311 are formed on the outer side of the cylindrical body 31, and a conveying cavity 312 communicating with the multiple straightening grooves 311 is formed between the two ends of the cylindrical body 31. Straightening blocks 33 are inserted into the straightening grooves 311, and bolts 34 are threadedly connected to both ends of the straightening grooves 311. The ends of the two bolts 34 abut against the two ends of the straightening blocks 33, respectively. Furthermore, the inner side of the head of the bolt 34 abuts against the outer side of the cylindrical body 31. The outer side of the head of multiple bolts 34 on the same side is provided with a positioning rod 35. The two ends of the positioning rod 35 are bent toward the cylindrical body 31 and fitted with a fixing block 36. The fixing block 36 is fixedly installed on the outer side of the cylindrical body 31, and a pin is inserted between the end of the positioning rod 35 and the fixing block 36. Through the cooperation of the positioning rod 35 and the pin, multiple bolts 34 on the same side are positioned to prevent the bolts 34 from loosening during the rotation of the cylindrical body 31.

[0063] Before the cylindrical straightening unit 3 starts working, the straightening block 33 is inserted into the straightening groove 311 on the outside of the cylindrical body 31. The bolts 34 at both ends of the straightening groove 311 are rotated so that the ends of the two bolts 34 abut against the ends of the straightening block 33 respectively, and the straightening block 33 is fixed in the straightening groove 311. At the same time, it is ensured that the inner side of the head of the bolt 34 abuts against the outer side of the cylindrical body 31. Then, the positioning rod 35 is placed on the outer side of the head of multiple bolts 34 on the same side, so that the bent part at both ends of the positioning rod 35 is sleeved on the fixing block 36. A pin is inserted between the end of the positioning rod 35 and the fixing block 36 to fix the positioning rod 35, thereby positioning multiple bolts 34 on the same side.

[0064] While adjusting the conveying tension of the steel pipe workpiece, the first cylinder 24 can also be adapted to convey steel pipe workpieces of different specifications. When it is necessary to replace the straightening block 33 adapted to steel pipe workpieces of different specifications, since the size of the straightening block 33 remains unchanged, the positioning rod 35 can be manually opened and the bolt 34 on one side can be removed to replace the straightening block 33 with a straightening channel 331 of different specifications. Since the bolt 34 on the other side remains stationary, there is no need to reposition it, and the positioning rod 35 can keep the position of the bolt 34 unchanged, which can ensure that the axis of the straightening block 33 remains unchanged after replacement, thereby ensuring that it coincides with the axis of the steel pipe workpiece and the cylindrical straightening unit 3. After the equipment is started, the cylindrical body 31 rotates above the worktable 1 through the bearing seat 32. The steel pipe workpiece enters the straightening block 33 through the conveying chambers 312 at both ends of the cylindrical body 31 and completes the straightening operation under the rotation of the cylindrical body 31. Throughout the process, the positioning rod 35 always positions the bolt 34 to prevent it from loosening.

[0065] The cooperation between the straightening groove 311 and the straightening block 33, combined with the adaptability of the first cylinder 24 to steel pipe workpieces of different specifications, allows for the straightening of steel pipe workpieces of different specifications by replacing the straightening block 33 with a straightening channel 331 of different specifications. The size of the straightening block 33 remains unchanged. When replacing, only one side of the bolt 34 and positioning rod 35 needs to be removed, while the other side of the bolt 34 remains stationary without repositioning. The positioning rod 35 can effectively fix the position of the bolt 34, ensuring that the axis of the straightening block 33 remains unchanged after replacement, thereby ensuring that it coincides with the axis of the steel pipe workpiece and the cylindrical straightening unit 3, ensuring stable straightening effect. The bolt 34 can quickly fix the straightening block 33, which is convenient for installation and disassembly and improves the efficiency of equipment debugging. The cooperation between the positioning rod 35, the fixing block 36, and the pin can prevent the bolt 34 from loosening when the cylindrical body 31 rotates at high speed, avoid the straightening block 33 from shifting and causing a decrease in straightening accuracy, and prevent the bolt 34 from falling off and causing equipment failure or safety hazards, thereby improving the safety and reliability of equipment operation.

[0066] Furthermore, the straightening block 33 has a cylindrical straightening channel 331 inside, and both sides of the straightening block 33 have conical grooves 332 that communicate with the straightening channel 331. The conical grooves 332 are used to guide the steel pipe workpiece when it enters and exits the straightening channel 331. Guide blocks 37 are fixedly inserted into the inner walls of both ends of the conveying cavity 312. The axes of the guide blocks 37, the straightening channel 331 and the conical grooves 332 coincide. The steel pipe workpiece is set through the guide blocks 37, the straightening channel 331 and the conical grooves 332.

[0067] After the steel pipe workpiece is conveyed to the cylindrical straightening unit 3 via the first tension unit 2, it first passes through the guide block 37 at one end of the conveying cavity 312 of the cylindrical body 31. After being guided by the guide block 37, it enters the conical groove 332 on one side of the straightening block 33. The conical groove 332 guides the steel pipe workpiece, allowing it to accurately enter the straightening channel 331 inside the straightening block 33. After the steel pipe workpiece completes the straightening operation in the straightening channel 331, it is guided by the conical groove 332 on the other side of the straightening block 33, and then passes through the guide block 37 at the other end of the conveying cavity 312 to enter the second tension unit 4. Throughout the process, the axes of the guide block 37, the straightening channel 331, and the conical groove 332 always remain aligned, ensuring that the steel pipe workpiece passes smoothly along the set axis.

[0068] Furthermore, the first drive unit 5 includes a first drive motor 51 fixedly installed below the table surface of the workbench 1. The output end of the first drive motor 51 is fixedly fitted with a first pulley 52, and the outer side of the cylindrical body 31 is fixedly fitted with a second pulley 53. A first transmission belt 54 is fitted between the first pulley 52 and the second pulley 53.

[0069] When the first drive unit 5 is started, the first drive motor 51, which is fixedly installed below the table surface of the workbench 1, starts to run. The output end of the first drive motor 51 drives the first pulley 52, which is fixedly sleeved on its outer side, to rotate synchronously. The first pulley 52 transmits power to the second pulley 53 through the first transmission belt 54 sleeved between it and the second pulley 53. The second pulley 53 drives the cylindrical body 31, which is fixedly sleeved on it, to rotate synchronously. The cylindrical body 31 rotates smoothly above the workbench 1 through the bearing seat 32, thereby driving the straightening block 33 inside to rotate synchronously, so as to realize the straightening processing of the steel pipe workpiece.

[0070] Furthermore, the second drive unit 6 includes a second drive motor 61 fixedly installed below the table surface of the workbench 1, a support base 62 fixedly connected above the workbench 1, a drive shaft 232 fixedly inserted inside the lower tension wheel 231, and the end of the drive shaft 232 passing through the lower sliding seat 23.

[0071] When the second drive unit 6 is started, the second drive motor 61, which is fixedly installed below the table surface of the workbench 1, begins to run, providing power for the operation of the first tension unit 2 and the second tension unit 4. The support seat 62, which is fixedly connected above the workbench 1, provides installation support for the transmission components of the second drive unit 6, ensuring that the transmission components are installed stably. The transmission shaft 232, which is fixedly inserted inside the lower tension wheel 231, transmits the power of the second drive unit 6 to the lower tension wheel 231. The end of the transmission shaft 232 passes through the lower sliding seat 23, ensuring that the transmission shaft 232 can rotate stably, thereby driving the lower tension wheel 231 to rotate synchronously, and cooperating with the upper tension wheel 221 to realize the clamping and conveying of the steel pipe workpiece.

[0072] Furthermore, the output end of the second drive motor 61 is fixedly fitted with a first transmission wheel 63. The transmission shaft 232 of the first tension unit 2 and the transmission shaft 232 of the second tension unit 4 are respectively fixedly fitted with a second transmission wheel 64 and a third transmission wheel 65. Two fourth transmission wheels 66 are rotatably connected to the outside of the support base 62. A second transmission belt 67 is connected between the first transmission wheel 63, the second transmission wheel 64, the third transmission wheel 65 and the two fourth transmission wheels 66. When the second drive motor 61 drives the first transmission wheel 63 to rotate, the two fourth transmission wheels 66 simultaneously drive the second transmission wheel 64 and the third transmission wheel 65 to rotate.

[0073] The second drive motor 61 operates, and its output end drives the first transmission wheel 63, which is fixedly sleeved on the outside, to rotate synchronously. The first transmission wheel 63 transmits power to the two fourth transmission wheels 66 rotatably connected to the outside of the support base 62 through the second transmission belt 67. The two fourth transmission wheels 66 rotate synchronously and change the direction of power transmission, respectively transmitting power to the second transmission wheel 64 outside the transmission shaft 232 of the first tension unit 2 and the third transmission wheel 65 outside the transmission shaft 232 of the second tension unit 4. The second transmission wheel 64 and the third transmission wheel 65 drive their respective corresponding transmission shafts 232 to rotate synchronously, thereby driving the lower tension wheels 231 of the two tension units to rotate synchronously, realizing the synchronous conveying of the first tension unit 2 and the second tension unit 4. When the positions of the upper tension wheel 221 and the lower tension wheel 231 of the first tension unit 2 and the second tension unit 4 are adjusted, the tension of the second transmission belt 67 will change. At this time, the drive auxiliary unit 7 operates synchronously to ensure the tension of the second transmission belt 67 is stable, so that the second drive unit 6 can stably drive the first tension unit 2 and the second tension unit 4 without affecting the transmission stability.

[0074] Through the cooperation of the first transmission wheel 63, the second transmission wheel 64, the third transmission wheel 65, the two fourth transmission wheels 66, and the second transmission belt 67, the second drive unit 6 synchronously drives the first tension unit 2 and the second tension unit 4, ensuring that the conveying rhythm of the two tension units is completely synchronized and avoiding tension fluctuations, pulling, or slack during the conveying of the steel pipe workpiece. At the same time, the drive auxiliary unit 7 can adjust the tension of the second transmission belt 67 in a timely manner after the positions of the upper tension wheel 221 and the lower tension wheel 231 are adjusted, ensuring stable belt tension and enabling the power of the second drive unit 6 to be transmitted stably. The transmission effect will not be affected by abnormal belt tension, further ensuring the synchronization of the two tension units and providing a foundation for the smooth conveying and stable straightening of the steel pipe workpiece. The fourth transmission wheel 66 can change the direction of power transmission, optimize the transmission structure layout, and improve the stability and reliability of the transmission.

[0075] Furthermore, the drive auxiliary unit 7 includes a second cylinder 71 fixedly installed on the outside of the support base 62. An auxiliary frame 72 is fixedly connected to the top of the support base 62. A moving block 73 is slidably arranged on the inner wall of the auxiliary frame 72. A belt tension wheel 74 rotates on the outside of the moving block 73. A connecting block 75 is fixedly connected between the output end of the second cylinder 71 and the bottom of the moving block 73. Anti-detachment grooves are opened on the outside of the first transmission wheel 63, the second transmission wheel 64, the third transmission wheel 65, the two fourth transmission wheels 66 and the belt tension wheel 74. The second transmission belt 67 is driven between the multiple anti-detachment grooves. The second cylinder 71 drives the connecting block 75 to drive the moving block 73 to slide up and down, thereby adjusting the height of the belt tension wheel 74 and realizing the adjustment of the tension of the second transmission belt 67.

[0076] When the first tension unit 2 and the second tension unit 4 adjust the conveying tension according to the specifications of the steel pipe workpiece, that is, after the positions of the upper tension wheel 221 and the lower tension wheel 231 are adjusted, the tension of the second transmission belt 67 will change. At this time, the second cylinder 71 of the drive auxiliary unit 7 is activated. Its core function is to ensure the tension of the second transmission belt 67 is stable, and to ensure that the second drive unit 6 can stably drive the two tension units. In specific operation, the output shaft of the second cylinder 71 extends and retracts, driving the connecting block 75 fixedly connected to the bottom of the moving block 73 to move synchronously. The connecting block 75 drives the moving block 73 to slide up and down along the inner wall of the auxiliary frame 72. When the moving block 73 moves, it drives the belt tension wheel 74, which is rotatably connected to its outer side, to move up and down synchronously. The belt tension wheel 74 adjusts the tension of the second transmission belt 67 by contacting it, thereby regulating the tension of the second transmission belt 67. Throughout the process, the anti-detachment grooves on the outer side of the first transmission wheel 63, the second transmission wheel 64, the third transmission wheel 65, the two fourth transmission wheels 66, and the belt tension wheel 74 can prevent the second transmission belt 67 from falling off, ensuring transmission stability and ensuring that the second drive unit 6 can stably drive the first tension unit 2 and the second tension unit 4 without affecting the transmission.

[0077] Furthermore, a system control method for a novel tension straightening device is provided, comprising the following steps:

[0078] Step 1: System Parameter Initialization

[0079] Based on the material, outer diameter, and wall thickness of the small-diameter steel pipe to be processed, the outer diameter of the steel pipe is 3–12mm, the preset conveying tension threshold is 800–6000N, and according to the outer diameter of the steel pipe, the tension threshold increases by 600N for every 1mm increase in outer diameter; the preset conveying speed threshold is 8–40r / min; the preset straightening speed threshold is 60–180r / min; the allowable deviation of tension fluctuation is set to ±4%, that is, when the tension exceeds the preset threshold by ±4%, adjustment is triggered; the allowable deviation of laser detection spacing is set to ±0.008mm, that is, when the difference between two sets of spacing exceeds ±0.008mm, a fault is determined.

[0080] Step 2: Feed guide and mechanical coaxiality calibration

[0081] The steel pipe workpiece enters the first tension unit 2. The control system activates the laser transmitter 25 and the laser receiver 251 to detect the distances between the laser transmitter 25 and the upper tension wheel 221, and between the laser transmitter 25 and the lower tension wheel 231 in real time, respectively, and feeds back the two sets of detection data to the control system. The control system compares the two sets of distance data:

[0082] If the difference between the two sets of data is ≤ ±0.008mm, which meets the allowable deviation of the laser detection spacing, then the synchronous drive component 26 is determined to be working normally, the central axis of the small diameter steel pipe coincides with the axis of the cylindrical straightening unit 3, and the conveying is allowed to start; if the difference between the two sets of data is > ±0.008mm, then the synchronous drive component 26 is determined to be faulty, the steel pipe axis is offset, the control system immediately issues an audible and visual alarm and stops the machine, waiting for manual inspection.

[0083] Step 3: Start Synchronous Conveying and Straightening Operations

[0084] After the mechanical coaxiality calibration is passed, the control system starts the second drive unit 6, adjusts the speed of the second drive motor 61 to the preset conveying speed threshold of 8–40 r / min, and drives the first tension unit 2 and the second tension unit 4 to operate synchronously, so that the steel pipe workpiece is stably clamped and conveyed. When the front end of the steel pipe workpiece enters the conveying cavity 312 of the cylindrical straightening unit 3, the control system starts the first drive unit 5, adjusts the speed of the first drive motor 51 to the preset straightening speed threshold of 60–180 r / min, drives the cylindrical body 31 to rotate, and performs straightening and roundness straightening processing on the small-diameter steel pipe, entering the stable operation stage.

[0085] Step 4: Real-time tension monitoring and dynamic adjustment during operation

[0086] During stable operation of the equipment, the tension sensor collects the conveying tension signal of the small-diameter steel pipe in real time and feeds back the data to the control system every 0.1 seconds. The control system compares the real-time tension signal with the preset conveying tension threshold of 800–6000N and performs adjustments based on the allowable deviation of ±4% for tension fluctuation.

[0087] When the real-time tension is greater than the preset tension threshold × 1.04, which is 4% above the upper limit, the control system determines that the conveying tension is too large and immediately controls the first cylinder 24 to move, driving the upper sliding seat 22 and the lower sliding seat 23 to make synchronous fine adjustments, reducing the clamping force of the upper tension wheel 221 and the lower tension wheel 231. Each adjustment is 1% of the preset tension, until the real-time tension falls back to the range of the preset tension threshold ± 4%.

[0088] When the real-time tension is less than the preset tension threshold × 0.96, i.e. 4% below the lower limit, the control system determines that the conveying tension is insufficient and controls the first cylinder 24 to reverse its action to increase the clamping force. Each adjustment is 1% of the preset tension to ensure that the small-diameter steel pipe is not loose, not stuck, and not axially moving, until the real-time tension returns to the preset range.

[0089] After the tension adjustment is completed, the first cylinder 24 locks the current state, fixing the distance between the upper tension wheel 221 and the lower tension wheel 231 until the next tension fluctuation exceeds the threshold or the specification is switched.

[0090] Step 5: Coordinated Adjustment of Tension and Rotation Speed

[0091] The control system performs coordinated adjustment of tension and rotation speed based on the real-time tension signal fed back by the tension sensor and a preset rotation speed threshold. The specific adjustment logic is as follows:

[0092] When the real-time tension exceeds the preset tension threshold × 1.04 for 3 seconds, i.e. the tension is too high, the control system synchronously performs speed adjustment: the straightening speed of the first drive unit 5 is reduced by 5%-10%, based on the current straightening speed, and the reduction amount does not exceed 10 r / min each time. At the same time, the conveying speed of the second drive unit 6 is reduced by 4%-9%, which is 80%-90% of the straightening speed reduction, to extend the straightening time of the steel pipe workpiece in the straightening channel 331 and avoid tensile deformation, surface scratches, and inner wall scratches.

[0093] When the real-time tension remains below the preset tension threshold × 0.96 for 3 seconds, i.e. the tension is too low, the control system synchronously performs speed adjustment: the straightening speed of the first drive unit 5 is increased by 5%-10%, with each increase not exceeding 15 r / min, and the conveying speed of the second drive unit 6 is increased by 5%-10%, consistent with the increase in the straightening speed, so as to improve processing efficiency while ensuring sufficient straightening.

[0094] After the speed is adjusted, the control system continuously monitors the tension signal. If the tension returns to the preset range, the current speed is maintained; if the tension still fluctuates, the above adjustment steps are repeated until the tension and speed reach a stable state.

[0095] Step Six: Automatic Compensation Adjustment of Drive Belt Tension

[0096] During the tension adjustment in step four or the speed adjustment in step five, the tension of the second transmission belt 67 will change. The control system monitors the belt tension in real time through the belt tension detection module and the tension sensor, setting the belt tension threshold to 120–320N, with an allowable fluctuation deviation of ±10%.

[0097] When the belt tension is greater than 320N×1.1, which is 10% above the upper limit, the control system activates the drive auxiliary unit 7, controls the second cylinder 71 to retract, and drives the belt tension wheel 74 to move downward to reduce the belt tension. When the belt tension is less than 120N×0.9, which is 10% below the lower limit, the control system extends the second cylinder 71, drives the belt tension wheel 74 to move upward to increase the belt tension until the belt tension returns to the range of 120–320N, ensuring the stable drive of the second drive unit 6 on the first tension unit 2 and the second tension unit 4, and avoiding transmission slippage that could cause the steel pipe to vibrate or jam.

[0098] Step 7: Specification Switching and Quick Changeover

[0099] When it is necessary to replace a small-diameter steel pipe with a different outer diameter, the control system receives the changeover command and immediately stops the operation of the first drive unit 5 and the second drive unit 6, controls the first cylinder 24 to reset, and releases the upper tension wheel 221 and the lower tension wheel 231. The positioning rod 35 and one side bolt 34 are manually removed, and the straightening block 33 of the straightening channel 331 of the corresponding specification is replaced. The other side bolt 34 is kept in place, ensuring that the axis of the straightening block 33 coincides with the axis of the steel pipe workpiece and the cylindrical straightening unit 3. After the replacement is completed, the control system reloads the parameters corresponding to the new specification steel pipe workpiece, including the tension threshold and the speed threshold, and automatically executes steps two to six without manual recalibration, directly entering a new round of processing.

[0100] Step 8: Anomaly Monitoring and Security Protection

[0101] The control system monitors the operating status of each unit in real time throughout the entire process and sets three levels of abnormal protection thresholds:

[0102] Minor abnormalities: If the tension exceeds the preset threshold by ±4%–±10%, or the belt tension exceeds ±10%–±15%, the system will issue an alarm and automatically perform adaptive adjustment without stopping the machine.

[0103] Moderate abnormality: If the tension exceeds the preset threshold by more than ±10% or the laser detection distance difference is greater than ±0.015mm, the system will issue an audible and visual alarm, automatically reduce the speed to 50% of the preset value, and lock the adjustment function, waiting for manual troubleshooting.

[0104] Serious abnormality: Sudden increase / decrease in tension, change exceeding 20% ​​of the preset threshold, loss of speed control, belt breakage. The system immediately triggers the emergency stop procedure, cuts off the power supply to each drive unit, controls the first cylinder 24 to reset and release the tension wheel, protects the small-diameter steel pipe from being crushed or scratched, protects the equipment structure, issues an emergency alarm, and continues until manual reset and maintenance.

[0105] Step Nine: Processing Completed and System Reset

[0106] After the steel pipe workpieces are processed and fully discharged, the control system detects the discharge signal and sequentially stops the operation of the first drive unit 5 and the second drive unit 6. It then controls the first cylinder 24 to reset to its initial position, resets the drive auxiliary unit 7, restores the second transmission belt 67 to its initial tension, and stops the laser transmitter 25 and laser receiver 251 from operating. The system clears the processing parameters for this operation and returns to standby mode, awaiting the next processing start.

[0107] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel tension straightening device, characterized in that, include: Workbench (1); The first tension unit (2) is installed above the worktable (1) and is used to drive the steel pipe workpiece to move horizontally. The cylindrical straightening unit (3) is located at the discharge end of the first tension unit (2). The steel pipe workpiece conveyed by the first tension unit (2) enters the cylindrical straightening unit (3) to complete the straightening operation. The second tension unit (4) is located at the discharge end of the cylindrical straightening unit (3) and is used to clamp the straightened steel pipe workpiece and stably convey it outward. The first driving unit (5) is connected to the cylindrical straightening unit (3) in a transmission manner, and drives the cylindrical straightening unit (3) to rotate, thereby realizing the straightening process of the steel pipe workpiece; The second drive unit (6) can simultaneously drive the first tension unit (2) and the second tension unit (4) to ensure that the conveying rhythm of the two tension units is synchronized. The drive auxiliary unit (7) is connected to the second drive unit (6). After the first tension unit (2) and the second tension unit (4) adjust the conveying tension of the steel pipe workpiece, the drive auxiliary unit (7) adjusts the driving tension of the second drive unit (6) to ensure the driving process.

2. The novel tension straightening device according to claim 1, characterized in that, The first tension unit (2) and the second tension unit (4) have the same structure, both including a conveyor frame (21) and an upper sliding seat (22) and a lower sliding seat (23) slidably disposed inside the conveyor frame (21). The upper sliding seat (22) and the lower sliding seat (23) are respectively rotatably provided with an upper tension wheel (221) and a lower tension wheel (231). The outer circumferential of the upper tension wheel (221) and the lower tension wheel (231) are provided with arc-shaped fitting grooves. The steel pipe workpiece is clamped between the arc-shaped fitting grooves of the upper tension wheel (221) and the lower tension wheel (231) to achieve stable conveying. The front of the conveyor frame (21) is also fixedly installed with two guide cylinders (211), and the two guide cylinders (211) are located on both sides of the middle part of the upper tension wheel (221) and the lower tension wheel (231) to guide and limit the feeding and discharging direction of the steel pipe workpiece.

3. The novel tension straightening device according to claim 2, characterized in that, A first cylinder (24) is fixedly installed on the top of the conveyor frame (21). The output shaft of the first cylinder (24) passes through the top of the conveyor frame (21) and is fixedly installed on the top of the upper sliding seat (22). A synchronous drive assembly (26) is provided inside the conveyor frame (21). When the first cylinder (24) drives the upper sliding seat (22) to move vertically, the synchronous drive assembly (26) synchronously drives the lower sliding seat (23) to move in the opposite direction. When adjusting the distance between the upper tension wheel (221) and the lower tension wheel (231), the axial position of the steel pipe workpiece can be kept unchanged. A laser transmitting end (25) is fixedly installed on the back of the conveyor frame (21), and laser receiving ends (251) are installed on the sides of the upper sliding seat (22) and the lower sliding seat (23). Through the cooperation of the laser transmitting end (25) and the laser receiving end (251), the accurate detection of the moving distance of the upper sliding seat (22) and the lower sliding seat (23) can be achieved.

4. The novel tension straightening device according to claim 3, characterized in that, The synchronous drive assembly (26) includes a sliding groove (261) formed on the inner wall of the conveyor frame (21). Two sliding blocks (262) are slidably connected to the inner wall of the sliding groove (261), and the two sliding blocks (262) are fixedly connected to the sides of the upper sliding seat (22) and the lower sliding seat (23), respectively. The two sliding blocks (262) are fixedly connected to an upper rack (263) and a lower rack (264), and a gear (265) meshes between the upper rack (263) and the lower rack (264). Through the meshing of the gear (265) with the upper rack (263) and the lower rack (264), the synchronous reverse movement of the two sliding blocks (262) is realized.

5. The novel tension straightening device according to claim 1, characterized in that, The cylindrical straightening unit (3) includes a cylindrical body (31) and a bearing seat (32). The cylindrical body (31) is rotatably mounted above the workbench (1) via the bearing seat (32). Multiple through straightening grooves (311) are provided on the outer side of the cylindrical body (31), and a conveying cavity (312) communicating with the multiple straightening grooves (311) is provided between the two ends of the cylindrical body (31). A straightening block (33) is inserted into the straightening groove (311), and bolts (34) are threaded to both ends of the straightening groove (311). The ends of the two bolts (34) are respectively connected to the two ends of the straightening block (33). The bolts (34) abut against each other, and the inner side of the head of the bolt (34) abuts against the outer side of the cylindrical body (31). The outer side of the head of the multiple bolts (34) on the same side is provided with positioning rods (35). The two ends of the positioning rods (35) are bent toward the cylindrical body (31) and fitted with fixing blocks (36). The fixing blocks (36) are fixedly installed on the outer side of the cylindrical body (31). A pin is inserted between the end of the positioning rod (35) and the fixing block (36). Through the cooperation of the positioning rods (35) and the pins, the multiple bolts (34) on the same side are positioned to prevent the bolts (34) from loosening during the rotation of the cylindrical body (31).

6. A novel tension straightening device according to claim 5, characterized in that, The straightening block (33) has a cylindrical straightening channel (331) inside, and both sides of the straightening block (33) have conical grooves (332) that communicate with the straightening channel (331). The conical grooves (332) are used to guide the steel pipe workpiece when it enters and exits the straightening channel (331). Guide blocks (37) are fixedly inserted into the inner walls of both ends of the conveying cavity (312). The axes of the guide blocks (37), the straightening channel (331) and the conical grooves (332) are coincident. The steel pipe workpiece is set through the guide blocks (37), the straightening channel (331) and the conical grooves (332).

7. A novel tension straightening device according to claim 5, characterized in that, The first drive unit (5) includes a first drive motor (51) fixedly installed below the workbench (1). The output end of the first drive motor (51) is fixedly fitted with a first pulley (52), and the outer side of the cylindrical body (31) is fixedly fitted with a second pulley (53). A first transmission belt (54) is fitted between the first pulley (52) and the second pulley (53).

8. A novel tension straightening device according to claim 2, characterized in that, The second drive unit (6) includes a second drive motor (61) fixedly installed below the workbench (1). A support base (62) is fixedly connected above the workbench (1). A transmission shaft (232) is fixedly inserted inside the lower tension wheel (231). The end of the transmission shaft (232) passes through the lower sliding seat (23).

9. A novel tension straightening device according to claim 8, characterized in that, The output end of the second drive motor (61) is fixedly fitted with a first transmission wheel (63). The transmission shaft (232) of the first tension unit (2) and the transmission shaft (232) of the second tension unit (4) are respectively fixedly fitted with a second transmission wheel (64) and a third transmission wheel (65). The outer side of the support base (62) is rotatably connected with two fourth transmission wheels (66). The first transmission wheel (63), the second transmission wheel (64), the third transmission wheel (65) and the two fourth transmission wheels (66) are connected by a second transmission belt (67). When the second drive motor (61) drives the first transmission wheel (63) to rotate, the two fourth transmission wheels (66) simultaneously drive the second transmission wheel (64) and the third transmission wheel (65) to rotate.

10. A novel tension straightening device according to claim 9, characterized in that, The drive auxiliary unit (7) includes a second cylinder (71) fixedly installed on the outside of the support base (62). An auxiliary frame (72) is fixedly connected to the top of the support base (62). A moving block (73) is slidably arranged on the inner wall of the auxiliary frame (72). A belt tension wheel (74) rotates on the outside of the moving block (73). A connecting block (75) is fixedly connected between the output end of the second cylinder (71) and the bottom of the moving block (73). Anti-detachment grooves are opened on the outside of the first transmission wheel (63), the second transmission wheel (64), the third transmission wheel (65), the two fourth transmission wheels (66) and the belt tension wheel (74). The second transmission belt (67) is driven between multiple anti-detachment grooves. The second cylinder (71) drives the connecting block (75) to drive the moving block (73) to slide up and down, thereby adjusting the height of the belt tension wheel (74) and realizing the adjustment of the tension of the second transmission belt (67).

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