Plastic composite pipe reinforcing band laser welding device

Abstract

The invention discloses a laser welding device for a reinforcing band of a plastic composite pipe, and belongs to the technical field of plastic pipe forming. The center of the rotary body is provided with a through hole for a base tube to pass through; the belt wheel is arranged on the rotary body, the belt wheel outputs the reinforcing belt to the surface of the base pipe, and the reinforcing belt is spirally wound on the surface of the base pipe at a preset winding angle along with the linear movement of the base pipe and the rotation of the rotary body; and the laser welding mechanism is arranged on the rotary body and faces the joint point of the reinforcing band and the base tube, and a laser beam emitted by the laser welding mechanism heats resin on the surface of the reinforcing band and the surface of the base tube to the melting temperature at the same time and enables the reinforcing band and the base tube to be welded together. Due to the fact that the reinforcing belts and the base pipe do not need to be preheated respectively, the problem that gaps between adjacent belts are changed after winding due to the fact that the preheated reinforcing belts are heated and stretched under the action of tension is solved, the problem that the base pipe is stretched and deformed due to heating in the forward traction process is also solved, and the quality of the formed composite pipe is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic pipe molding, and in particular relates to a laser welding device for a plastic composite pipe reinforcement belt. Background Art

[0002] Plastic composite pipes are often made of glass fiber or polyester filaments as reinforcement materials coated with PE to form a reinforcement tape. The reinforcement tape is uniformly wound around the pipe at a certain winding angle and a certain winding tension. In order to achieve the reinforcement effect, the reinforcement tape needs to be welded and bonded to the pipe.

[0003] The current production process usually includes preheating the reinforcement tape and the pipe, and then with the linear conveying of the pipe and the rotation of the winding machine, the winding machine spirally wraps the reinforcement tape onto the surface of the pipe, so that it forms a stable composite pipe structure after cooling. However, this molding method has the following major defects:

[0004] 1. Gap problem caused by change in width of enhanced belt:

[0005] During the winding process, the reinforcement tape needs to maintain a certain tension, which will cause the pre-heated reinforcement tape to be stretched and narrowed. After being wound onto the pipe surface, gaps may appear between adjacent reinforcement tapes, thus affecting the overall quality and reinforcement effect of the composite pipe.

[0006] 2. Pipe quality problems caused by thermal deformation and traction:

[0007] During the straight-line conveying process of the pipe, the pipe will be subjected to continuous traction. For the preheated pipe, it is more likely to be thermally deformed, especially under the influence of traction, the pipe may be over-stretched, thereby damaging the dimensional accuracy and mechanical properties of the final product. Summary of the invention

[0008] The present invention aims at the above problems existing in the prior art and proposes a laser welding device for reinforcing bands of a plastic composite pipe, which ensures that the pipe is not deformed and the gap between adjacent reinforcing bands is controlled.

[0009] The present invention can be achieved through the following technical solutions:

[0010] A laser welding device for a plastic composite pipe reinforcement strip, comprising:

[0011] A rotating body having a through hole at its center for the substrate pipe to pass through;

[0012] A pulley is arranged on the rotating body, and the pulley outputs the reinforcement belt to the surface of the base pipe. With the linear movement of the base pipe and the rotation of the rotating body, the reinforcement belt is spirally wound on the surface of the base pipe at a preset winding angle;

[0013] The laser welding mechanism is arranged on the rotating body and is arranged toward the joining point of the reinforcement belt and the base tube. The laser beam emitted by the laser welding mechanism heats the resin on the surface of the reinforcement belt and the surface of the base tube to the melting temperature at the same time and welds the two together.

[0014] As a further improvement of the present invention, the reinforcement strip and the base pipe form an angle at the joining point between the two, and the laser welding mechanism is located on the side where the angle formed by the two is located.

[0015] As a further improvement of the present invention, it also includes a mounting plate, which is provided in multiple pieces and is distributed at intervals on the rotating body.

[0016] As a further improvement of the present invention, the laser welding mechanism is mounted on the mounting plate via a fixture, and one fixture can integrate multiple laser welding mechanisms to accommodate reinforcement strips of different widths.

[0017] As a further improvement of the present invention, the laser welding mechanism includes a laser head and an optical device assembly, the laser head is rotatably connected to the optical device assembly, and the optical device assembly is movably arranged on the fixture.

[0018] As a further improvement of the present invention, the laser head generates uniformly distributed rectangular laser focal points, and the heating temperature and heating time of the resin by the laser are controlled by adjusting the laser power.

[0019] As a further improvement of the present invention, it also includes a pressure wheel mechanism, and any one of the mounting plates is provided with the pressure wheel mechanism, the pulley and the laser welding mechanism.

[0020] As a further improvement of the present invention, the pressing wheel mechanism comprises a pressing wheel, and the pressing wheel is used to abut against the joining point between the reinforcement belt and the base pipe to press the reinforcement belt.

[0021] As a further improvement of the present invention, the pressure wheel mechanism also includes a linear motor and a connecting plate, the linear motor is arranged on the mounting plate, the connecting plate is connected to the linear motor, and the pressure wheel is arranged at the end of the connecting plate, and the linear motor drives the connecting plate to move and makes the pressure wheel approach or move away from the base pipe.

[0022] As a further improvement of the present invention, with the linear transportation of the base pipe and the rotation of the rotating body, each of the pulleys synchronously transports the reinforcement belt to the surface of the base pipe to form a multi-layer reinforcement belt structure, and any layer of the reinforcement belt structure is welded by the independent laser welding mechanism.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Ensure the quality of the composite pipe: Ultrasonic welding is only performed on the contact surface between the reinforcement belt and the base pipe and the contact surface between adjacent reinforcement belts. There is no need to preheat the reinforcement belt and the base pipe respectively. This avoids the problem that the preheated reinforcement belt is stretched under tension, resulting in changes in the gap between adjacent belts after winding. It also avoids the problem of the base pipe being stretched and deformed due to heat during the forward pulling process, thus ensuring the quality of the composite pipe after forming;

[0025] 2. Reduce costs: It is precisely because there is no need to heat the reinforcement belt and the base tube separately, thereby reducing the corresponding heating equipment. In particular, when the base tube is preheated, an infrared heating cylinder for the base tube to pass through needs to be set. The cost of this infrared heating cylinder is relatively high. However, the present application only needs to set up a number of laser welding mechanisms, which greatly reduces the production cost.

[0026] 3. Improve production efficiency: Laser welding is a fast and precise connection method. It can complete the welding work synchronously during the winding process of the reinforcement belt, greatly shortening the production cycle and eliminating the need for additional cooling steps.

[0027] 4. Improve welding quality: Laser welding can ensure that the welding surface of the base tube and the reinforcement belt is heated evenly, thus improving the welding quality;

[0028] 5. Strong adaptability: The laser welding mechanism can be flexibly adjusted according to different pipe diameters and reinforcement belt specifications, and is suitable for the manufacture of various types of plastic composite pipes, increasing the application range of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a laser welding device for a plastic composite pipe reinforcement belt according to the present invention;

[0030] Figure 2 It is a schematic diagram of the base pipe wrapped reinforcement tape of the present invention.

[0031] In the figure, 100, rotating body; 110, pulley; 111, reinforcing belt; 112, guide wheel; 120, laser welding mechanism; 121, clamp; 122, laser head; 123, optical device assembly; 124, laser beam; 130, mounting plate; 140, pressure wheel mechanism; 141, pressure wheel; 142, linear motor; 143, linear motor; 200, base tube. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical method of the present invention, but the present invention is not limited to these embodiments.

[0033] like Figure 1-2 As shown, the present invention provides a laser welding device for a plastic composite pipe reinforcement belt, comprising:

[0034] The rotating body 100 has a through hole at its center for the substrate pipe 200 to pass through;

[0035] The pulley 110 is arranged on the rotating body 100. The pulley 110 outputs the reinforcement belt 111 to the surface of the base pipe 200. With the linear movement of the base pipe 200 and the rotation of the rotating body 100, the reinforcement belt 111 is spirally wound on the surface of the base pipe 200 at a preset winding angle.

[0036] The laser welding mechanism 120 is arranged on the rotating body 100 and is arranged toward the joining point of the reinforcement belt 111 and the base tube 200. The laser beam 124 emitted by the laser welding mechanism 120 heats the resin on the surface of the reinforcement belt 111 and the surface of the base tube 200 to the melting temperature at the same time and welds the two together.

[0037] It should be noted that, in the prior art, the reinforcement tape 111 and the base pipe 200 need to be preheated respectively, and then with the linear transportation of the base pipe 200 and the rotation of the winding machine, the winding machine can spirally wind the reinforcement tape 111 onto the surface of the base pipe 200, and the preheated reinforcement tape 111 and the base pipe 200 are welded during the winding process. However, this forming method has the problem that, on the one hand, the preheated reinforcement tape 111 becomes narrower due to stretching during winding, resulting in gaps between adjacent reinforcement tapes 111 after winding, and on the other hand, the preheated base pipe 200 is easily thermally deformed due to the action of traction during the linear transportation process, resulting in the problem of excessive stretching of the base pipe 200.

[0038] The laser welding device provided in this embodiment performs laser heating welding only at the joints between the reinforcement band 111 and the base tube 200. Compared with the method of preheating the reinforcement band 111 and the base tube 200 separately in the prior art, it has at least the following advantages:

[0039] 1. Guarantee the quality of the composite pipe: Ultrasonic welding is performed only on the contact surface between the reinforcement belt 111 and the base pipe 200 and the contact surface between adjacent reinforcement belts 111. It is not necessary to preheat the reinforcement belt 111 and the base pipe 200 respectively. This avoids the problem that the preheated reinforcement belt 111 is stretched under tension due to heat, resulting in changes in the gap between adjacent belts after winding. It also avoids the problem that the base pipe 200 is stretched and deformed due to heat during the forward pulling process, thereby ensuring the quality of the composite pipe after forming;

[0040] 2. Reduce costs: Because there is no need to heat the reinforcing belt 111 and the base tube 200 separately, the corresponding heating equipment is reduced. In particular, when the base tube 200 is preheated, an infrared heating cylinder for the base tube 200 to pass through needs to be provided. The cost of such infrared heating cylinder is relatively high. However, in the present application, only a plurality of laser welding mechanisms 120 are required, which greatly reduces the production cost.

[0041] 3. Improve production efficiency: Laser welding is a fast and accurate connection method, which can complete the welding work synchronously during the winding process of the reinforcement belt 111, greatly shortening the production cycle and does not require additional cooling steps;

[0042] 4. Improve welding quality: Laser welding can ensure that the welding surface of the base tube 200 and the reinforcement belt 111 is heated evenly, thereby improving welding quality;

[0043] 5. Strong adaptability: The laser welding mechanism 120 can be flexibly adjusted according to different pipe diameters and specifications of the reinforcing belt 111, and is suitable for the manufacture of various types of plastic composite pipes, thereby increasing the application range of the equipment.

[0044] Preferably, the reinforcement belt 111 and the base tube 200 form an angle at the joint point between the two, and the laser welding mechanism 120 is located on the side where the angle is formed between the two, ensuring that the laser beam 124 can directly irradiate the joint surface of the reinforcement belt 111 and the base tube 200. Since the laser has a high degree of directionality and concentration, such a layout can make the laser energy more effectively concentrated on the area that needs to be heated, that is, the joint surface of the resin layer of the base tube 200 and the reinforcement belt 111, so as to achieve the purpose of precise heating and welding;

[0045] This method not only improves welding efficiency, but also reduces the impact on surrounding materials because the heat is only concentrated in the welding area, avoiding unnecessary thermal deformation or damage.

[0046] Preferably, it further includes a mounting plate 130 , of which a plurality of mounting plates 130 are provided and are distributed at intervals on the rotating body 100 .

[0047] Preferably, the laser welding mechanism 120 is mounted on the mounting plate 130 via a clamp 121, which not only provides stable support but also gives the laser welding mechanism 120 a certain adjustment capability, so that its position can be adjusted according to different processing requirements.

[0048] Among them, a fixture 121 can integrate multiple laser welding mechanisms 120 to adapt to reinforcement strips 111 of different widths. It should be noted here that since the laser beam 124 emitted by the laser welding mechanism 120 is a uniformly distributed rectangular laser focus, the effective range of the laser beam 124 emitted by a single laser welding mechanism 120 is limited. When the width of the reinforcement strip 111 exceeds this range, multiple laser welding mechanisms 120 can be integrated on the same fixture 121 and arranged side by side, so that the multiple rectangular laser focuses they emit can cover the entire width of the reinforcement strip 111, ensuring that each part can be properly heat treated and welded. For narrower reinforcement strips 111, the number of laser welding mechanisms 120 used can be reduced, thereby saving energy and reducing unnecessary heat input.

[0049] This design enables one device to flexibly handle various specifications of reinforcement belts 111 without frequent hardware replacement. Different production tasks can be met by simply adjusting the number and configuration of the laser welding mechanisms 120, which is very important for rapid switching of production lines and diversified product manufacturing.

[0050] Furthermore, the laser welding mechanism 120 includes a laser head 122 and an optical device assembly 123, wherein:

[0051] The laser head 122 is rotatably connected to the optical device assembly 123 to adjust the inclination angle of the laser head 122. By adjusting the inclination angle of the laser head 122, the incident angle of the laser beam 124 can be optimized to ensure that the laser beam 124 can accurately irradiate the joint surface of the reinforcement belt 111 and the base pipe 200, thereby improving the welding effect;

[0052] The optical device assembly 123 is movably disposed on the fixture 121 to adjust the distance between the laser head 122 and the welding part. The appropriate distance between the laser head 122 and the welding part is crucial to obtaining ideal welding quality, which not only helps to avoid excessive heating due to too close a distance or energy loss caused by too far a distance, but also ensures that the laser focus always remains within the optimal working range to achieve uniform and efficient welding. By flexibly adjusting the working distance, the focusing degree of the laser beam 124 can be better controlled to ensure the accuracy of heat input during welding, reduce unnecessary heat-affected zones, and ensure welding quality.

[0053] In general, the combination of the rotatable laser head 122 and the movable optical device assembly 123 provides a highly flexible laser beam 124 positioning capability, which not only improves the welding quality between the reinforcement band 111 and the base tube 200, but also is more flexible and can cope with welding requirements in various complex situations, such as base tubes 200 of different diameters, different winding angles and reinforcement band 111 widths, etc., greatly expanding the application range of the equipment.

[0054] In addition, by adjusting the laser power, the heating temperature and heating time of the resin by the laser can be controlled. The laser power directly affects the energy density of the laser beam 124, which in turn determines the degree to which the resin material is heated and indirectly affects the heating time. By precisely controlling the laser power, it can be ensured that each welding point can obtain the optimal temperature and time combination, thereby improving the quality and strength of the weld. At the same time, the laser power can also be flexibly adjusted according to different materials and application requirements, so that the equipment can adapt to a variety of production tasks, increasing its versatility and market competitiveness.

[0055] Preferably, a pressure wheel mechanism 140 is also included. Any mounting plate 130 is provided with a pressure wheel mechanism 140, a pulley 110 and a laser welding mechanism 120, that is, any reinforcement belt 111 is equipped with a corresponding pressure wheel mechanism 140 and a laser welding mechanism 120. Each reinforcement belt 111 is welded to the base pipe 200 independently without interfering with each other, thereby ensuring the consistency and stability of each reinforcement belt 111 when it is wound onto the base pipe 200, and ensuring that each reinforcement belt 111 can obtain the best welding effect during the winding process.

[0056] Preferably, the pressing wheel mechanism 140 includes a pressing wheel 141, which is used to press against the joining point between the reinforcement belt 111 and the base tube 200 to compress the reinforcement belt 111. The pressing wheel 141 is a component that directly contacts the reinforcement belt 111, and is used to apply appropriate pressure when the reinforcement belt 111 is wrapped around the surface of the base tube 200, ensuring that the reinforcement belt 111 fits tightly on the base tube 200, thereby improving the thermal fusion effect of the resin layers of the reinforcement belt 111 and the base tube 200.

[0057] Furthermore, the pressing wheel mechanism 140 further includes a linear motor 142 and a connecting plate 143. The linear motor 142 is disposed on the mounting plate 130. The connecting plate 143 is connected to the linear motor 142. The pressing wheel 141 is disposed at the end of the connecting plate 143. The linear motor 142 drives the connecting plate 143 to move and makes the pressing wheel 141 approach or move away from the substrate pipe 200.

[0058] By adjusting the position of the pressing wheel 141 through the linear motor 142, not only the pressing wheel mechanism 140 can be adapted to base pipes 200 of different diameters, but also the pressure of the pressing wheel 141 on the base pipe 200 can be controlled to ensure that the reinforcement belt 111 can obtain the best fitting effect.

[0059] In addition, a plurality of guide wheels 112 are provided on the mounting plate 130. The guide wheels 112 guide the reinforcement belt 111, thereby ensuring the accuracy and stability of the conveying path of the reinforcement belt 111 and ensuring that the reinforcement belt 111 maintains appropriate tension during the conveying process.

[0060] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical schemes composed of any combination of the above technical features. The above is a specific implementation of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

[0061] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0062] In addition, in the present invention, descriptions such as ",","one", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined with "," may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A laser welding device for reinforcing strips of plastic composite pipes, characterized in that: include: A rotating body having a through hole at its center for the substrate pipe to pass through; A pulley is arranged on the rotating body, and the pulley outputs the reinforcement belt to the surface of the base pipe. With the linear movement of the base pipe and the rotation of the rotating body, the reinforcement belt is spirally wound on the surface of the base pipe at a preset winding angle; The laser welding mechanism is arranged on the rotating body and is arranged toward the joining point of the reinforcement belt and the base tube. The laser beam emitted by the laser welding mechanism heats the resin on the surface of the reinforcement belt and the surface of the base tube to the melting temperature at the same time and welds the two together.

2. A laser welding device for reinforcing strips of a plastic composite pipe according to claim 1, characterized in that: The reinforcement belt and the base pipe form an angle at the joining point between the two, and the laser welding mechanism is located on the side where the angle formed by the two is located.

3. A laser welding device for reinforcing strip of plastic composite pipe according to claim 1, characterized in that: It also includes a mounting plate, which is provided in multiple pieces and is distributed on the rotating body at intervals.

4. A laser welding device for reinforcing strips of a plastic composite pipe according to claim 3, characterized in that: The laser welding mechanism is mounted on the mounting plate through a fixture, and one fixture can integrate multiple laser welding mechanisms to adapt to reinforcement strips of different widths.

5. A laser welding device for reinforcing strips of a plastic composite pipe according to claim 4, characterized in that: The laser welding mechanism comprises a laser head and an optical device assembly. The laser head is rotatably connected to the optical device assembly, and the optical device assembly is movably arranged on the fixture.

6. A plastic composite pipe reinforcement belt laser welding device according to claim 5, characterized in that: The laser head generates uniformly distributed rectangular laser focal points, and the heating temperature and heating time of the resin by the laser are controlled by adjusting the laser power.

7. The laser welding device for reinforcing strip of plastic composite pipe according to claim 3 is characterized in that: It also includes a pressure wheel mechanism, and any one of the mounting plates is provided with the pressure wheel mechanism, the belt pulley and the laser welding mechanism.

8. A laser welding device for reinforcing strips of a plastic composite pipe according to claim 7, characterized in that: The pressing wheel mechanism comprises a pressing wheel, and the pressing wheel is used to abut against the joining point between the reinforcement belt and the base pipe to press the reinforcement belt.

9. A laser welding device for reinforcing strips of a plastic composite pipe according to claim 8, characterized in that: The pressure wheel mechanism also includes a linear motor and a connecting plate. The linear motor is arranged on the mounting plate. The connecting plate is connected to the linear motor. The pressure wheel is arranged at the end of the connecting plate. The linear motor drives the connecting plate to move and makes the pressure wheel approach or move away from the base pipe.

10. A laser welding device for reinforcing strips of a plastic composite pipe according to claim 1, characterized in that: With the linear conveyance of the base pipe and the rotation of the rotary body, each of the pulleys synchronously conveys the reinforcement belt to the surface of the base pipe to form a multi-layer reinforcement belt structure, and any layer of the reinforcement belt structure is welded by the independent laser welding mechanism.

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