Strip winding method and pipe winding production line

Abstract

The invention discloses a strip winding method and a pipe winding production line.The strip winding method comprises the steps that a plurality of twisting bodies are adjusted to be coaxial, based on the conveying speed of a center pipe and a preset winding pitch value, the strip releasing linear speed is obtained, the position change of a dance wheel represents the tension change of the strip, the tension of the strip is adjusted, and the tension of the strip is adjusted to be equal to the conveying speed of the center pipe and the preset winding pitch value. When the twisting body rotates, the tension of the strip is calibrated in real time, during calibration, the angle change between the gravity direction of the dance wheel and the strip is obtained by detecting the revolution position of the dance wheel, and hedging is carried out on the gravity component force change of the dance wheel based on the angle change. According to the invention, the tension of the strip reaches the preset standard value by adjusting the strip releasing speed of the strip releasing disc, so that the rotating speed of the stranding body is adapted, the tension of the strip is always maintained at the preset tension standard value, the strip can be uniformly wound on the surface of the central pipe under the stable tension, and the deformation and contusion of the central pipe are prevented.

Description

Technical Field

[0001] This invention relates to the field of pipe processing technology, and in particular to a strip winding method and a pipe winding production line. Background Technology

[0002] Composite pipes are pipes made by combining a non-metallic inner tube with a wound strip through a composite process. The inner tube is typically made of PE (polyethylene), while the wound strip is usually made of fiberglass tape, steel cord, or steel strip. During the forming process of composite pipes, fiber tape needs to be wound around the surface of the central tube (inner tube) for bonding and reinforcement, forming the core of the composite pipe. When winding the strip, because the extrusion speed of the central tube is relatively high, reaching up to 5 meters per second, after the central tube enters the winding machine, the winding machine's winding mechanism needs to quickly increase the rotational speed of the unwinding reel from zero to match the speed of the central tube's feed, ensuring that the strip released from the unwinding reel is evenly wound around the surface of the central tube.

[0003] Because the strip released by the rotating unloading reel generates tension between the central tube and the unloading reel, during acceleration, the initial unloading speed of the strip is relatively slow, resulting in excessive tension. This causes the strip to easily taut against the surface of the central tube, leading to overly tight winding, deformation, and damage to the central tube. Furthermore, excessive tension can cause the unloading reel to vibrate, resulting in unstable tension and affecting the operation of the winding machine. During subsequent heating, the length of the central tube after winding will increase to some extent, creating a speed difference in the conveying speed of the central tube. If the unloading and winding are continued at the original speed, the strip tension will become even more unstable, and the winding pitch will also be inconsistent. Summary of the Invention

[0004] This invention provides a strip winding method and a pipe winding production line, which can solve the problem of unstable tension of strip during the winding process in the prior art.

[0005] A method for winding strip includes: adjusting several strands to make them coaxial; A preset winding pitch value is used to obtain the linear velocity of the strip release based on the conveying speed of the central tube and the preset winding pitch value. A preset tension standard value is set. The change in the position of the dance wheel represents the change in the tension of the belt. By detecting the pressure applied by the belt to the dance wheel, the belt feeding speed of the feeding reel is adjusted to regulate the tension of the belt until the tension of the belt reaches the preset tension standard value. When the auger rotates, the tension of the strip is calibrated in real time. During calibration, the angle change between the direction of gravity and the strip is obtained by detecting the revolution position of the dance wheel. The change of the gravitational component of the dance wheel is counteracted based on the angle change. While the tape reel rotates, the winding body drives the tape reel to revolve around the central tube. The tape it releases wraps around the surface of the continuously moving central tube, forming a wrapped tube. The wrapped tube is heated and a traction force is applied to it to maintain the coaxiality of the wrapped tube. The twisted body is subjected to signal holding processing to maintain its original working state in the event of a communication interruption.

[0006] Ideally, the preset tension standard value should match the conveying speed of the central tube.

[0007] Preferably, the dance wheel is equipped with a pressure sensor for monitoring the linear velocity of the strip release and the pressure applied by the strip to the dance wheel.

[0008] Preferably, during the counter-shock, the counter-shock force is calculated based on the revolution angle of the dance wheel, and the actual tension value of the strip is determined to be higher or lower than the standard tension value based on the direction of the counter-shock force.

[0009] Preferably, the counterforce is equal to the gravitational component of the dance wheel.

[0010] Preferably, the gravitational component of the dance wheel is the component of the dance wheel's gravity in the direction perpendicular to the tangential plane of the strip and the dance wheel.

[0011] A pipe winding production line, applicable to a strip winding method, includes: a plurality of winding machines, with a heating furnace disposed between two adjacent winding machines; The winding machine includes a winding body, a conveying pipe is provided at the center of the winding body, and the winding body and the conveying pipe are rotatably connected by a bearing. Multiple tape feeding discs are arranged in a circular array at the discharge port of the conveying pipe. When the winding body rotates, the tape release reel rotates on its own axis and revolves around the central pipe conveyed by the conveying pipe, and the tape it releases wraps around the central pipe. The tape release reel is equipped with an adjustable dance wheel in the tape release direction. The dance wheel represents the tension change of the tape by its own position change, and is used to observe the tightness of the tape.

[0012] Preferably, the auger is also connected to the auger body, the blower duct of the blower is connected to a hot air gun, and the air outlet of the hot air gun points towards the center pipe.

[0013] Preferably, the strip reel is equipped with multiple mechanical guide rollers for guiding the strip to the central tube.

[0014] Preferably, it also includes a traction machine for pulling the central tube.

[0015] The beneficial effects of this invention are: (1) In this invention, the tension of the strip is made to reach the preset standard value by adjusting the speed of the strip release reel, thereby adapting to the speed of the winding body and ensuring that the tension of the strip is always maintained at the preset tension standard value. Stable tension can avoid the oscillation of the reel. Under stable tension, the strip will be evenly wound on the surface of the central tube, which is not easy to be tight, and prevents the central tube from being deformed and damaged due to excessive winding.

[0016] (2) In this invention, the influence of the weight of the dance wheel on the tension of the strip is balanced by calibrating the tension, which can further improve the stability of the strip tension.

[0017] (3) In this invention, by adding multiple traction devices on the production line to perform staged traction on the wrapped pipe, the drooping middle section of the wrapped pipe is straightened. The traction force compensates for the speed difference caused by the deformation of the pipe and the change in the length of the pipe, so that the pipe always maintains coaxiality and matches the conveying speed of the pipe. It can also maintain the stability of the winding pitch of the strip and prevent uneven pitch. Attached Figure Description

[0018] Figure 1 This is a schematic flowchart of a strip winding method provided by the present invention; Figure 2 This is a schematic diagram of the structure of a pipe winding production line provided by the present invention; Figure 3 for Figure 2 A three-dimensional structural diagram of a winding machine; Figure 4 for Figure 2 Front view of a winding machine; Figure 5 for Figure 2 Side view of a winding machine; Figure 6 for Figure 3 Enlarged view of point A in the middle; Figure 7 This is a structural diagram illustrating the process of the pipe being wound with strip. Figure 8 Force analysis diagram for when the revolution position of the dance wheel is below the strip; Figure 9 This is a force analysis diagram when the revolution position of the dance wheel is above the strip.

[0019] Explanation of reference numerals in the attached figures: 1. Wrapping machine; 11. Support frame; 12. Conveying pipe; 13. Tape unloading reel; 14. Blower; 15. Hot air gun; 16. Dance wheel; 17. Mechanical guide wheel; 2. Heating furnace. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0021] The inventors discovered that during the winding process of the central tube, the auger needs to accelerate from zero speed to the rotational speed required for actual winding, so that the winding speed of the strip can keep up with the conveying speed of the central tube. Therefore, its acceleration is relatively large in a short period of time. When the auger rotates at a rapid speed, the release speed of the strip is insufficient, resulting in excessive tension. The taut strip causes the central tube to be wound too tightly. Excessive tension in the strip also causes the unwinding reel to oscillate, which is detrimental to the winding of the strip.

[0022] like Figures 1-7 As shown, an embodiment of the present invention provides a strip winding method, comprising: Adjusting several twisting bodies, that is, adjusting the grid frame set on the twisting bodies to make several twisting bodies coaxial.

[0023] A preset winding pitch value is used to obtain the linear velocity of the strip release based on the conveying speed of the central tube and the preset winding pitch value.

[0024] Generally, the conveying speed and winding pitch of the central tube correspond to a fixed linear velocity of the released strip. This linear velocity can be found in an empirically derived correspondence table or calculated using a formula tailored to actual production needs. Therefore, the output power of the motor connected to the unwinding reel 13 can be adjusted based on the obtained linear velocity of the released strip, making the unwinding speed of the unwinding reel 13 adjustable. Controlling its unwinding speed ensures that the strip maintains appropriate tension during the winding of the central tube.

[0025] Specifically, the output power of the unloading reel 13 motor corresponds to the corresponding speed. There is a speed ratio between the motor speed and the unloading reel 13 speed. A reducer is connected between the unloading reel 13 and the motor. The reducer drives the motor to rotate the unloading reel 13 according to the speed ratio. That is, different speeds of the unloading reel 13 correspond to different linear velocities (i.e., unloading speeds).

[0026] A preset tension standard value is established, which needs to match the conveying speed of the central tube. The positional change of the dancing wheel 16 represents the tension change of the strip. By detecting the pressure applied by the strip to the dancing wheel 16, the unloading speed of the unloading reel 13 is adjusted to regulate the tension of the strip until the tension of the strip reaches the preset tension standard value.

[0027] The dancing wheel 16 is a device used to characterize changes in strip tension. The dancing wheel 16 moves in conjunction with a spring, and the change in strip tension is reflected by the positional change of the dancing wheel 16 itself. When the strip tension increases, the dancing wheel 16 pops outward; when the strip tension decreases, the dancing wheel 16 presses downward towards the strip. Throughout the process, the dancing wheel 16 remains in contact with the strip. The dancing wheel 16 also contains a pressure sensor to monitor the linear velocity of the released strip and the pressure applied to the dancing wheel 16 by the strip. The pressure sensor transmits torque signals to the PLC control system, which can adjust the speed of the unloading reel 13 motor through PID calculations.

[0028] Specifically, before the central tube enters the winding machine 1, the rotational speed of the auger increases in a stepwise manner from zero to the speed required for actual winding of the central tube. This ensures that after the central tube enters the winding machine 1, the auger can smoothly wind the strip released by the unwinding reel 13 onto the surface of the central tube. Therefore, the rotational speed of the auger increases rapidly in a short period of time, while the strip released by the unwinding reel 13 at the preset initial release speed cannot keep up with the auger speed in a short time, resulting in unstable tension. At this time, the position change of the dancing wheel 16 reflects the strip tension. By adjusting the unwinding speed of the unwinding reel 13 to reach the preset standard value, the dancing wheel 16 can reset (the relative position between it and the auger is reset), thus adapting to the auger speed. This ensures that the strip tension is always maintained at the preset standard value, and the stable tension also avoids the oscillation of the reel 13. Under stable tension, the strip will be evenly wound on the surface of the central tube, preventing it from becoming too tight and thus preventing deformation and damage to the central tube due to excessive winding.

[0029] The dance wheel 16 has various structures, including but not limited to the arm swing type and the linear motion type. Both of these types of dance wheels 16 are existing technologies, so they will not be described in detail here.

[0030] During the rotation of the auger, the strip tension needs to be calibrated in real time. Calibration is achieved by detecting the angular change between the direction of gravity of the dance wheel 16 and the strip by monitoring its revolution position. This angular change is then used to counteract the change in the gravitational component of the dance wheel 16. It should be noted that the current angle of the auger rotation is the revolution position of the dance wheel 16, which can be detected by the encoder. Furthermore, the gravitational component of the dance wheel 16 is the component of its gravity perpendicular to the direction perpendicular to the tangential plane between the strip and the dance wheel 16.

[0031] During counter-shock, the counter-shock force is calculated based on the revolution angle of the dancing wheel 16. The direction of the counter-shock force determines whether the actual tension value of the strip is higher or lower than the standard tension value. The counter-shock force is equal to the gravitational component of the dancing wheel 16.

[0032] Specifically, when the auger rotates, the dancing wheel 16 revolves above the strip for a period of time and below it for a period of time. Since the weight of the dancing wheel 16 is always vertically downward, the pressure exerted by the strip on the dancing wheel 16 changes with its revolving position. Therefore, it is necessary to balance the weight of the dancing wheel 16 to ensure the stability and accuracy of the strip tension, and thus calibrate the strip tension in real time. By calibrating the tension to balance the influence of the dancing wheel 16's weight on the strip tension, the stability of the strip tension can be further improved.

[0033] like Figure 8 As shown, when the dance wheel 16 is positioned below the belt during its revolution, the counterforce exerted by the belt on the dance wheel 16 and the pressure exerted by the dance wheel 16 on the belt are mutually interacting forces. The pressure exerted by the dance wheel 16 on the belt has the same value and direction as the gravitational component f of the dance wheel 16, and the value of the gravitational component f is G×cosθ. Therefore, the counterforce exerted by the belt on the dance wheel 16 has the same value as f but is in the opposite direction. Consequently, the actual tension value of the belt will be increased by the counterforce value, resulting in an actual tension value higher than the preset tension standard value. When calibrating the belt tension, this counterforce value needs to be subtracted to balance the weight of the dance wheel 16.

[0034] Correspondingly, such as Figure 9 As shown, when the dance wheel 16 is positioned above the belt, the counterforce exerted by the belt on the dance wheel 16 and the pressure exerted by the dance wheel 16 on the belt are mutually interacting forces. The pressure exerted by the dance wheel 16 on the belt has the same value but opposite direction as the gravitational component f of the dance wheel 16, and the value of the gravitational component f is G×cosθ. Therefore, the counterforce exerted by the belt on the dance wheel 16 has the same value and direction as f. Consequently, the actual tension of the belt will be reduced by the counterforce value, resulting in an actual tension value lower than the preset tension standard value. In this case, when calibrating the belt tension, it is necessary to increase this counterforce value to balance the weight of the dance wheel 16.

[0035] During the process of winding the strip onto the central tube, while the unwinding reel 13 rotates, the winding body drives the unwinding reel 13 to revolve around the central tube. The strip released by the unwinding reel 13 winds around the continuously moving surface of the central tube, forming a wrapped tube. The wrapped tube is heated and a traction force is applied to maintain its coaxiality. Each winding body is matched with multiple unwinding reels 13 and a heating furnace 2, which allows for multi-layer winding of the central tube. After each winding, the bonding between the strip and the central tube can be strengthened through the heating furnace 2.

[0036] Specifically, such as Figure 7As shown, the wrapped pipe needs to be heated to make the strip bond more tightly to the central pipe. However, the wrapped pipe will stretch and lengthen after heating, increasing the pitch d after the strip is wound. But the heated wrapped pipe material softens, and under the action of gravity, the middle section will sag due to gravity, making the pitch unstable. By adding multiple traction devices to the production line to perform staged traction on the wrapped pipe, the sag of the middle section of the wrapped pipe is straightened. The traction force compensates for the speed difference caused by the deformation of the pipe and the change in pipe length, ensuring that the pipe always maintains coaxiality and matches the pipe conveying speed. It can also maintain the stability of the strip winding pitch and prevent uneven pitch. The central pipe is made of non-metallic material, usually PE, which has a low degree of deformation, so the sag is not much. After passing through some heating furnaces 2 in the early stage, the central pipe has high hardness and large diameter, so the deformation is almost zero, and the pipe still maintains good coaxiality. Additional traction force is only required in the middle and later stages when the pipe diameter gradually decreases and the deformation increases. Therefore, there is no need to add traction equipment at each of the two heating furnaces; it is only necessary to add it in stages at the two heating furnaces in the middle and later stages.

[0037] Understandably, this method also requires signal holding processing for the strand to maintain its original working state in the event of a communication interruption. That is, the adjustment of the strip tension is temporarily lost, but this does not affect the continued production and processing of pipes.

[0038] It should be noted that the central pipe is wrapped in multiple layers during transportation, with the last layer, the outermost strip, serving a protective function.

[0039] The actual production process involves the following steps: S1. Adjust the position of several twisted bodies to make them coaxial.

[0040] S2. Preset a winding pitch value, and obtain the linear velocity of the strip release based on the conveying speed of the central tube and the preset winding pitch value.

[0041] S3. Preset a standard tension value, which needs to match the conveying speed of the central tube. By detecting the pressure applied by the strip to the dance wheel 16, adjust the unloading speed of the unloading reel 13 until the tension of the strip reaches the preset standard tension value.

[0042] S4. The auger rotates to calibrate the strip tension in real time. During calibration, the angle change between the direction of gravity and the strip is obtained by detecting the revolution position of the dance wheel 16. The change of gravity component of the dance wheel 16 is counteracted based on the angle change.

[0043] S5. The winding body drives the tape release reel 13 to revolve around the central pipe. The tape released by the tape release reel 13 wraps around the surface of the continuously moving central pipe to form a wrapped pipe. The wrapped pipe is heated and a traction force is applied to it to maintain the coaxiality of the wrapped pipe.

[0044] like Figures 2-7 As shown, in one embodiment, a pipe winding production line is applicable to a strip winding method. The pipe winding production line includes: a plurality of winding machines 1, with a heating furnace 2 disposed between two adjacent winding machines 1.

[0045] The winding machine 1 includes a winding body mounted on a support 11. The winding body is equipped with a grid frame, which can be adjusted to allow several winding bodies to achieve coaxiality. A conveying pipe 12 is also located at the center of the winding body, and the winding body and the conveying pipe 12 are rotatably connected via bearings. Multiple unloading reels 13 are arranged in a circular array at the outlet of the conveying pipe 12. Each unloading reel 13 is equipped with multiple mechanical guide wheels 17 for guiding the strip material to the central pipe.

[0046] As the winding body rotates, the tape reel 13 rotates on its own axis while revolving around the central tube conveyed by the conveying pipe 12. The tape released from the reel is guided to the central tube by the mechanical guide wheel 17 and wound around the central tube. A blower 14 is also connected to the winding body, and the blower 14's air duct is connected to a hot air gun 15. The air outlet of the hot air gun 15 is pointed towards the central tube. The hot air gun 15 blows hot air onto the central tube, pre-fixing the central tube and the tape, which facilitates stable winding and pitch during subsequent conveying.

[0047] The tape reel 13 is equipped with an adjustable dance wheel 16 in the tape release direction. The position adjustment of the dance wheel 16 is achieved by the change in tape tension. Accordingly, the dance wheel 16 characterizes the change in tape tension through its own position change, and is used to observe the tightness of the tape. In each group of mechanical guide wheels 17, there is one dance wheel 16 with an internal pressure sensor and adjustable position.

[0048] The pipe winding production line also includes a traction machine, which is used to pull the central pipe.

[0049] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A strip winding method, characterized by, The application relates to a winding machine, which comprises the following steps: adjusting the coaxiality of several winding bodies; presetting a winding pitch value, obtaining the linear velocity of the strip material based on the conveying speed of the central pipe and the preset winding pitch value; presetting a tension standard value, the position change of a dancing wheel (16) representing the tension change of the strip material, adjusting the unwinding speed of an unwinding disc (13) by detecting the pressure of the strip material applied to the dancing wheel (16) to adjust the tension of the strip material until the tension of the strip material reaches the preset tension standard value; when the winding body rotates, the tension of the strip material is calibrated in real time, when the calibration is performed, the angle change between the gravity direction of the dancing wheel (16) and the strip material is obtained by detecting the revolution position of the dancing wheel (16), and the gravity component change of the dancing wheel (16) is offset based on the angle change; when the unwinding disc (13) rotates, the winding body drives the unwinding disc (13) to revolve along the central pipe, the strip material released by the unwinding disc (13) is wound on the surface of the continuously moving central pipe to form a wrapped pipe, the wrapped pipe is heated, and a pulling force is applied to the wrapped pipe to maintain the coaxiality of the wrapped pipe; signal maintaining treatment is performed on the winding body to maintain the original working state under communication interruption.

2. A strip winding method as claimed in claim 1, characterized in that The preset tension standard value needs to match the conveying speed of the central pipe.

3. A strip winding method as claimed in claim 1, characterized in that The dancing wheel (16) is matched with a pressure sensor for monitoring the linear velocity of the strip material and the pressure of the strip material applied to the dancing wheel (16).

4. A strip winding method as claimed in claim 1, characterized in that When the offset is performed, the offset force is calculated based on the revolution angle measurement of the dancing wheel (16), and the actual tension value of the strip material is judged to be higher or lower than the tension standard value according to the direction of the offset force.

5. A strip winding method as claimed in claim 4, characterized in that The offset force is equal to the gravity component value of the dancing wheel (16).

6. A strip winding method as claimed in claim 1, characterized in that The gravity component of the dancing wheel (16) is the gravity component of the dancing wheel (16) in the direction perpendicular to the tangent plane direction of the strip material and the dancing wheel (16).

7. A pipe winding line adapted to a pipe winding method according to any one of claims 1-6, characterized in that, The application relates to a winding machine, which comprises the following steps: a plurality of winding machines (1) are arranged with heating furnaces (2) between two adjacent winding machines (1); the winding machine (1) comprises a winding body, a conveying pipe (12) is arranged at the center of the winding body, the winding body and the conveying pipe (12) are rotationally connected through bearings, and a plurality of unwinding discs (13) are arranged in the circumferential array of the discharging port of the conveying pipe (12); when the winding body rotates, the unwinding disc (13) rotates at the same time and revolves around the central pipe conveyed by the conveying pipe (12), and the strip material released by the unwinding disc (13) is wound on the central pipe; the unwinding disc (13) is provided with a dancing wheel (16) with an adjustable position in the unwinding direction of the strip material, the dancing wheel (16) represents the tension change of the strip material through the position change of the dancing wheel (16), and the tightness of the strip material is observed.

8. A pipe winding line as claimed in claim 7, characterized in that an air blower (14) is further connected to the winding body, a blowing pipeline of the air blower (14) is connected with a hot air gun (15), and a blowing port of the hot air gun (15) points to the central pipe.

9. A pipe winding line as claimed in claim 7, characterized in that The unwinding disc (13) is provided with a plurality of mechanical guide wheels (17) for guiding the strip material to the central pipe.

10. A pipe winding line as claimed in claim 7, characterized in that a traction machine is further arranged, and the traction machine is used for traction of the central pipe.

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