A straightening machine for heat treating steel pipes

Abstract

The utility model relates to a straightening machine for heat treatment steel pipe, including first straightening mechanism and second straightening mechanism of sequential distribution, first straightening mechanism's output end is connected with second straightening mechanism input end, first straightening mechanism includes: straightening block, limit block, conveying device and motor base, straightening block sets up in the left side top of conveying device, the left side wall of straightening block is fixedly connected with the symmetry of two push motor, limit block sets up in the right side of conveying device, one end of limit block is equipped with the through -hole, rotates and is connected with output shaft in through -hole, one end of output shaft is connected with push motor, push motor is fixed on motor base, the utility model designs cleverly, adopts first straightening mechanism and second straightening mechanism of sequential distribution, first straightening mechanism's output end is connected with second straightening mechanism input end, can carry out secondary straightening to steel pipe and can improve the effect of straightening.

Description

Technical Field

[0001] This utility model relates to the field of straightening machine processing technology, specifically to a straightening machine for heat-treated steel pipes. Background Technology

[0002] Straightening rollers are devices used to straighten metal bars, tubes, wires, etc. Straightening rollers press the bars or other materials to change their straightness.

[0003] In heat treatment processes, straightening steel pipes is a crucial step in ensuring product quality. After heat treatment, steel pipes often experience varying degrees of bending deformation due to the release of internal stress and the influence of external heating conditions. This deformation not only affects the appearance of the steel pipe but can also lead to dimensional accuracy issues during subsequent processing or use, ultimately impacting the overall performance and reliability of the product. Traditional steel pipe straightening methods rely primarily on manual operation or simple mechanical devices, which have several shortcomings. For example, manual straightening is inefficient, labor-intensive, and lacks guaranteed accuracy, often resulting in incomplete straightening. While some simple mechanical straightening devices improve efficiency to some extent, they often only straighten the steel pipe in a single direction, failing to achieve ideal straightening results for steel pipes with complex bends. Furthermore, the straightening process causes significant surface damage to the steel pipe, easily creating new quality defects. With the continuous development of industrial production, the requirements for the quality and efficiency of steel pipe straightening are becoming increasingly stringent. Therefore, developing equipment capable of efficiently and accurately straightening heat-treated steel pipes has become a pressing technical problem for the industry. Based on this background, the present invention proposes a straightening machine for heat-treated steel pipes, aiming to overcome the shortcomings of the prior art, and hereby applies for this invention. Utility Model Content

[0004] In order to solve the above-mentioned problems in the prior art, this utility model provides a straightening machine for heat-treated steel pipes that can improve the above deficiencies.

[0005] This utility model relates to a straightening machine for heat-treated steel pipes, comprising a first straightening mechanism and a second straightening mechanism arranged in sequence. The output end of the first straightening mechanism is connected to the input end of the second straightening mechanism. The first straightening mechanism includes a straightening block, a limiting block, a conveying device, and a motor base. The straightening block is located on the upper left side of the conveying device. Two symmetrical push motors are fixedly connected to the left side wall of the straightening block. The limiting block is located on the right side of the conveying device. One end of the limiting block has a through hole, and an output shaft is rotatably connected inside the through hole. One end of the output shaft is connected to a push motor, and the push motor is fixed on the motor base.

[0006] Furthermore, the conveying device includes a conveyor belt, a driving wheel, and a driven wheel. The conveyor belt is a steel track. The driving wheel is fixedly connected to the other end of the output shaft. Both the driving wheel and the driven wheel are provided with teeth.

[0007] Furthermore, the second straightening mechanism includes a mounting frame and multiple transmission rings spaced apart in the middle of the mounting frame, with two support rollers that are radially inclined at 30° relative to each other installed inside the transmission rings.

[0008] Furthermore, multiple rows of straightening roller groups are arranged facing each other on both sides of the conveying ring, with two straightening mechanisms in each row. The straightening mechanism includes a straight roller with its axis inclined. The surface of the straight roller is cylindrical and has a conical surface for bonding the workpiece. The conical surfaces of the straightening rollers on both sides of the straightening roller group are also in opposite directions.

[0009] Furthermore, the second straightening mechanism is equipped with a transmission main shaft, a second conical tooth, a first conical tooth, a conical tooth, a toothed belt, and a base plate frame. The base plate frame is installed on the mounting frame. The linear roller is rotatably connected inside the base plate frame. The linear roller is coaxially connected to the third conical tooth. The third conical tooth is located on the outside of the base plate frame. The third conical tooth is synchronously connected to the toothed pulley via the toothed belt. The first conical tooth is rotatably connected to the support plate on the outer wall of the base plate frame and is coaxially connected to the toothed pulley. The first conical tooth meshes with the second conical tooth for transmission.

[0010] This utility model is ingeniously designed, employing a first straightening mechanism and a second straightening mechanism arranged in sequence. The output end of the first straightening mechanism is connected to the input end of the second straightening mechanism, which allows for secondary straightening of the steel pipe and improves the straightening effect. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the first straightening mechanism of this utility model.

[0012] Figure 2 This diagram shows the connection relationship between the driving teeth and driven teeth of the first straightening mechanism of this utility model.

[0013] Figure 3 This is a schematic diagram of the second straightening mechanism of this utility model.

[0014] Figure 4 This is a diagram showing the connection between the straightening roller and the drive shaft.

[0015] Diagram: 1 Limiting block, 2 Motor base, 3 Straightening block, 4 Push motor, 4 First conveyor, 5 Limiting plate, 6 Driving gear, 7 Driven gear, 8 Conveyor ring, 9 Support roller, 10 Straightening roller, 11 Toothed belt pulley, 12 Transmission main shaft, 13 First conical tooth, 14 Second conical tooth, 15 Toothed belt, 16 Third conical tooth, 17 Conical surface, 18 Base plate. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0017] like Figure 1-4 As shown, this utility model relates to a straightening machine for heat-treated steel pipes, including a first straightening mechanism and a second straightening mechanism arranged in sequence. The output end of the first straightening mechanism is connected to the input end of the second straightening mechanism. The first straightening mechanism includes: a straightening block 3, a limiting block 1, a conveying device, and a motor base 2. The straightening block is located on the upper left side of the conveying device. Two symmetrical push motors 4 are fixedly connected to the left side wall of the straightening block. The limiting block is located on the right side of the conveying device. One end of the limiting block is provided with a through hole, and an output shaft is rotatably connected in the through hole. One end of the output shaft is connected to the push motor 4, and the push motor is fixed on the motor base.

[0018] Furthermore, the conveying device includes a conveyor belt 4, a driving wheel 6, and a driven wheel 7. The conveyor belt is a steel track. The driving wheel is fixedly connected to the other end of the output shaft. Both the driving wheel and the driven wheel have teeth. The inner side of the steel track conveyor belt of the conveying device has tooth grooves that match the teeth of the driving wheel and the driven wheel. The driving wheel drives the conveyor belt through the meshing of its teeth with the tooth grooves, preventing slippage. The driving wheel is connected to the output shaft via a spline, and the driven wheel is floatingly supported by a bearing seat to adapt to changes in the tension of the conveyor belt.

[0019] Furthermore, the second straightening mechanism includes a mounting frame and multiple transmission rings 8 spaced apart in the middle of the mounting frame. Two support rollers 9, which are radially inclined at 30° relative to each other, are installed inside the transmission rings. The support rollers are used to support and transmit the steel pipe.

[0020] Furthermore, multiple rows of straightening roller groups (e.g., two rows with two straight rollers each) are arranged facing each other on both sides of the conveying ring. Each row has two straightening mechanisms. The straightening mechanism includes a straight roller 10 with its axis inclined. The surface of the straight roller is cylindrical and has a conical surface 17 for bonding the workpiece. The conical surfaces of the straightening rollers on both sides of the straightening roller group are also opposite in direction.

[0021] Furthermore, the second straightening mechanism is equipped with a transmission main shaft 12, a second conical tooth 14, a first conical tooth 13, a third conical tooth 16, a toothed pulley 11, a toothed belt 15, and a base plate frame 18. The base plate frame is mounted on a mounting frame, and the linear roller is rotatably connected inside the base plate frame 18. The linear roller is coaxially connected to the third conical tooth, which is located on the outside of the base plate frame. The third conical tooth and the toothed pulley are synchronously connected via the toothed belt 15, which is made of polyurethane synchronous belt, which is wear-resistant and has high transmission accuracy. The first conical tooth is rotatably connected to a support plate on the outer wall of the base plate frame for axial positioning and is coaxially connected to the toothed pulley. The first conical tooth meshes with the second conical tooth for transmission, and the second conical tooth is rigidly connected to the transmission main shaft via a flat key to ensure lossless power transmission. The transmission main shaft is electrically driven, with the motor serving as the power system. The power transmission path of the second straightening mechanism is as follows: the motor drives the transmission main shaft to rotate, the transmission main shaft is fixed to the second conical tooth by a key connection, the second conical tooth meshes with the first conical tooth (the two axes are perpendicular), the first conical tooth is fixed coaxially with the toothed pulley, the toothed pulley drives multiple third conical teeth to rotate synchronously through the toothed belt (each straightening roller group corresponds to a set of third conical teeth), and finally the third conical teeth drive the straight roller to rotate.

[0022] First Directly Affiliated Institutions Workflow

[0023] Feeding and positioning:

[0024] The steel pipe is placed on a conveyor belt (steel track), and the push motor drives the drive wheel to rotate. The conveyor belt transports the steel pipe between the straightening block and the limiting block. The limiting block is positioned by an output shaft inside a through hole, restricting the lateral displacement of the steel pipe.

[0025] Preliminary calibration:

[0026] Two horizontally opposed push motors on the left side of the straightening block extend synchronously, pushing the straightening block to the right to compress the steel pipe (the compression direction is perpendicular to the steel pipe axis), correcting the macroscopic curvature (such as large-radius curvature) of the steel pipe through plastic deformation. The thrust of the push motors can be adjusted via a PLC program, with an adjustment range of 5-20kN, suitable for steel pipe diameter ranges (e.g., Φ50-Φ200mm).

[0027] Output to the second calibration mechanism:

[0028] After straightening is completed, the push motor is reset, and the conveyor belt sends the steel pipe to the output end of the first straightening mechanism, and then guides it into the conveyor ring of the second straightening mechanism through the guide funnel.

[0029] Workflow of the Second Directly Affiliated Institution

[0030] Support and transmission:

[0031] After the steel pipe enters the conveyor ring, the internally inclined support rollers (inclination angle 30°) form a V-shaped support, which not only bears the weight of the steel pipe, but also conveys it forward through the rotation of the rollers (driven by the friction of the steel pipe). Multiple conveyor rings spaced apart (500mm apart) prevent long steel pipes from sagging.

[0032] Multi-directional alignment:

[0033] The straightening roller groups on both sides of the conveyor ring (2 rows on each side, 2 straight rollers per row) apply radial force to the steel pipe:

[0034] The axis of the linear roller is inclined at 15° to the axis of the steel pipe, and the conical surface (taper 1:10) is in contact with the outer circle of the steel pipe;

[0035] The conical surfaces of the straightening rollers on both sides are in opposite directions (the left conical surface rotates to the left and the right conical surface rotates to the right). When the straight rollers rotate, the conical surfaces generate a component force along the axial direction of the steel pipe, and at the same time apply a reverse torque to the bent part to achieve three-dimensional bending correction (such as bending up and down, left and right).

[0036] Power drive:

[0037] The motor drives all linear rollers to rotate synchronously (300 r / min) through the transmission spindle, conical gear set and toothed belt, ensuring that the steel pipe completes continuous straightening in uniform motion.

[0038] The speed of the conveyor belt in the first straightening mechanism (0.5-1 m / s) and the linear speed of the support rollers in the second straightening mechanism are controlled by a PLC, with an error of ≤ ±0.05 m / s to prevent steel pipe accumulation or stretching. Encoders installed on the shaft ends of the conveyor belt's drive wheel and the support rollers provide real-time speed feedback; the PLC adjusts the stepper motor frequency based on the difference.

Claims

1. A straightening machine for heat-treated steel pipes, characterized in that: The device includes a first straightening mechanism and a second straightening mechanism arranged in sequence. The output end of the first straightening mechanism is connected to the input end of the second straightening mechanism. The first straightening mechanism includes a straightening block, a limiting block, a conveying device, and a motor base. The straightening block is located on the upper left side of the conveying device. Two symmetrical push motors are fixedly connected to the left side wall of the straightening block. The limiting block is located on the right side of the conveying device. One end of the limiting block has a through hole, and an output shaft is rotatably connected inside the through hole. One end of the output shaft is connected to a push motor, and the push motor is fixed on the motor base.

2. A straightening machine for heat-treated steel pipes according to claim 1, characterized in that: The conveying device includes a conveyor belt, a drive wheel, and a driven wheel. The conveyor belt is a steel track. The drive wheel is fixedly connected to the other end of the output shaft. Both the drive wheel and the driven wheel are provided with teeth.

3. A straightening machine for heat-treated steel pipes according to claim 1, characterized in that: The second straightening mechanism includes a mounting frame and multiple transmission rings spaced apart in the middle of the mounting frame. Two support rollers with a radial inclination of 30° and relative to each other are installed in the transmission rings.

4. A straightening machine for heat-treated steel pipes according to claim 3, characterized in that: Multiple rows of straightening rollers are arranged facing each other on both sides of the conveyor ring. Each row has two straightening mechanisms. The straightening mechanism includes a straight roller with its axis inclined. The surface of the straight roller is cylindrical and has a conical surface for bonding the workpiece. The conical surfaces of the straightening rollers on both sides of the straightening roller group are also opposite in direction.

5. A straightening machine for heat-treated steel pipes according to claim 4, characterized in that: The second straightening mechanism is equipped with a transmission main shaft, a second conical tooth, a first conical tooth, a conical tooth, a toothed belt, and a base plate frame. The base plate frame is installed on the mounting frame. The linear roller is rotatably connected inside the base plate frame. The linear roller is coaxially connected to the third conical tooth. The third conical tooth is located on the outside of the base plate frame. The third conical tooth is synchronously connected to the toothed belt pulley. The first conical tooth is rotatably connected to the support plate on the outer wall of the base plate frame and coaxially connected to the toothed belt pulley. The first conical tooth meshes with the second conical tooth for transmission.

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