Method and apparatus for sealing reinforced composite pipe

Abstract

The application relates to the field of pipe manufacturing, and discloses a sealing method and sealing equipment for reinforced composite pipes, which comprises the following steps: S1. heating a sealing ring (3) by using a first heating device (1) so that an end surface of the sealing ring (3) for being jointed to the reinforced composite pipe (4) is melted; heating an end surface of the reinforced composite pipe (4) to be sealed by using a second heating device (2) so that the end surface to be sealed is melted; S2. moving at least one of the sealing ring (3) and the reinforced composite pipe (4) so that the melted end surface of the sealing ring (3) is coaxially connected with the end surface to be sealed of the reinforced composite pipe (4), and the coaxial connection is kept under a predetermined axial pressure for a predetermined time. The sealing method of the application facilitates the melted state to better meet the sealing requirement, thereby improving the final fusion effect, and the grinding pipe step is omitted by making the melted thickness of the sealing ring larger, and the sealing efficiency is effectively improved.

Description

Technical Field

[0001] This invention relates to a pipe manufacturing method, and more specifically to a sealing method for reinforced composite pipes. Furthermore, this invention also relates to a sealing device for reinforced composite pipes. Background Technology

[0002] Reinforced composite pipes typically refer to composite pipes reinforced with a reinforcing material. Their typical structure includes, from the inside out, an inner plastic pipe, a reinforcing layer, and an outer plastic pipe. The reinforcing layer in reinforced composite pipes can be made of wound or welded steel wire mesh, steel strip mesh, or aluminum strip mesh, etc.

[0003] To prevent oxidation and corrosion of the reinforcement in reinforced composite pipes due to exposure to air, plastic rings can be used to seal the cut surfaces of the pipes. This prevents oxidation of the reinforcement at the cut ends, allowing for long-term storage. Furthermore, it isolates the reinforcement from the fluid being transported within the piping system, preventing the fluid from entering the reinforcement layer and damaging the pipe body. Therefore, sealing the pipe ends of reinforced composite pipes is of great importance for ensuring their service and storage life.

[0004] Currently, the sealing process of reinforced composite pipes is usually carried out on a pipe grinding and sealing unit, which consists of pipe clamps arranged coaxially, heating plates, sealing ring chucks, and pipe grinding devices. During the sealing process, the pipe clamp holds the reinforced composite pipe to be sealed, and the heating plate and sealing ring chuck are withdrawn to outside the central axis of the reinforced composite pipe. The end face of the reinforced composite pipe to be sealed is then ground smooth using a pipe grinding device. Next, the sealing ring (a plastic ring with a wall thickness equivalent to that of the reinforced composite pipe) is clamped onto the sealing ring chuck, and it is reset to a position coaxial with the reinforcing composite pipe along with the heating plate. The reinforced composite pipe is then axially driven to move towards the heating plate, whereby the heating plate melts the end face of the reinforced composite pipe to be sealed and the end face of the sealing ring used to join the reinforced composite pipe. Then, the heating plate is withdrawn, and the reinforced composite pipe is continued to be axially driven to contact the end face of the sealing ring and hold it under pressure for a period of time to allow the molten material to cool and solidify, thus fusing the sealing ring and covering the end face of the reinforced composite pipe.

[0005] The existing sealing method described above has drawbacks. Because the reinforced composite pipe to be sealed and the sealing ring have different structural compositions, their heat requirements for melting differ. Using the same heating plate to heat their joined ends makes it difficult to ensure that their respective melting states meet the sealing requirements, resulting in a poor final weld. In this situation, to minimize the adverse effects of an unsatisfactory melting effect, the end face of the reinforced composite pipe to be sealed needs to be ground (pipe grinding) before axially connecting the sealing ring to the reinforced composite pipe, leading to low sealing efficiency. Summary of the Invention

[0006] The purpose of this invention is to overcome the problems of unsatisfactory welding effect and low sealing efficiency in the sealing process of reinforced composite pipes in the prior art, and to provide a sealing method for reinforced composite pipes. This sealing method facilitates the improvement of the welding effect between the end face to be sealed of the reinforced composite pipe and the sealing ring, and can effectively improve the sealing efficiency.

[0007] To achieve the above objectives, the present invention provides a sealing method for a reinforced composite pipe, comprising the following steps:

[0008] S1. The sealing ring is heated using a first heating device, causing the end face of the sealing ring used to join the reinforced composite tube to melt; the end face of the reinforced composite tube to be sealed is heated using a second heating device, causing the end face to be sealed to melt.

[0009] S2. Move at least one of the sealing ring and the reinforcing composite tube such that the molten end face of the sealing ring is coaxially connected with the end face of the reinforcing composite tube to be sealed, and maintain it under a predetermined axial pressure for a predetermined time.

[0010] Preferably, the first heating device includes a sealing ring plate with an annular groove. In step S1, the sealing ring is placed in the annular groove and heated in the annular groove so that the end face of the sealing ring facing the opening end of the annular groove melts.

[0011] Preferably, a heat-insulating heating plate is provided on the side of the sealing ring clamping plate opposite to the open end of the annular groove. In step S1 and / or S2, the heat-insulating heating plate transfers heat to the sealing ring placed in the annular groove through the sealing ring clamping plate.

[0012] Preferably, the first heating device further includes a sealing ring hot press plate, which has a hot press plate protrusion that matches the annular groove. In step S1, the relative movement between the sealing ring hot press plate and the sealing ring clamping plate is such that at least part of the hot press plate protrusion enters the annular groove and abuts against the sealing ring placed in the annular groove, so as to heat the end face of the sealing ring facing the hot press plate protrusion through the hot press plate protrusion and melt the end face.

[0013] Preferably, in step S1, the temperature of the hot-press plate protrusion ring is 200℃-220℃, and / or, the holding time of the hot-press plate protrusion ring against the sealing ring is 80s-200s.

[0014] Preferably, an anti-sticking layer is provided on the surface of the hot-press plate protrusion ring and / or the annular groove.

[0015] Preferably, in step S2, at least one of the sealing ring and the reinforcing composite tube is moved such that the end face of the reinforcing composite tube to be sealed enters the annular groove to coaxially connect with the molten end face of the sealing ring.

[0016] Preferably, the second heating device and the sealing ring clamping plate are mounted on the same mounting plate, which is slidably disposed on the frame. In step S2, the sealing ring placed in the annular groove is made coaxial with the reinforced composite pipe by sliding the mounting plate on the frame in a direction perpendicular to the axial direction of the reinforced composite pipe.

[0017] Preferably, the second heating device includes a hot air blower. In step S1, the hot air blower is used to blow hot air onto the end face of the reinforced composite tube to be sealed, so as to heat the end face to be sealed and melt it.

[0018] Preferably, in step S1, the end face of the reinforced composite tube to be sealed is heated to a temperature of 100°C-150°C.

[0019] Preferably, the second heating device includes a hot air ring disposed at the air outlet end of the hot air blower. In step S1, at least one of the reinforced composite pipe and the hot air blower is moved so that the end face of the reinforced composite pipe to be sealed enters the hot air ring.

[0020] Preferably, the hot air ring has an inner plate and an outer plate arranged radially spaced from each other to define a hot air duct between the inner plate and the outer plate. In step S1, the end face of the reinforced composite pipe to be sealed enters the hot air duct. The hot air duct is provided with a baffle ring for guiding the flow of hot air. And / or, the hot air duct has an inner ring air outlet and an outer ring air outlet distributed circumferentially, respectively. The total flow area of ​​the inner ring air outlet is greater than the total flow area of ​​the outer ring air outlet.

[0021] Preferably, in step S2, the predetermined axial pressure is 0.1MPa-1MPa, and the predetermined time is 60s-200s.

[0022] Preferably, in step S2, at least one of the sealing ring and the reinforced composite tube is moved using a servo motor or a stepper motor.

[0023] Preferably, the sealing method further includes step S3, which is performed after step S2: removing excess material at the junction of the sealing ring and the reinforced composite tube using a trimming tool.

[0024] A second aspect of the present invention provides a sealing device for a reinforced composite pipe, comprising a first heating device for heating a sealing ring and a second heating device for heating the end face of the reinforced composite pipe to be sealed. The first heating device includes a sealing ring retaining plate having an annular groove and a sealing ring hot pressing plate having a hot pressing plate protrusion matching the annular groove. The sealing ring hot pressing plate and the sealing ring retaining plate are movable relative to each other such that at least a portion of the hot pressing plate protrusion enters the annular groove and abuts against the sealing ring placed in the annular groove, so as to heat the end face of the sealing ring facing the hot pressing plate protrusion through the hot pressing plate protrusion and melt the end face.

[0025] Preferably, an anti-sticking layer is provided on the surface of the hot-press plate protrusion ring and / or the annular groove.

[0026] Preferably, the sealing device includes a mounting plate slidably disposed on a frame, on which the second heating device and the sealing ring retainer are mounted, such that the sealing ring placed in the annular groove is coaxial with the reinforced composite pipe by sliding the mounting plate on the frame in a direction perpendicular to the axial direction of the reinforced composite pipe.

[0027] Preferably, the second heating device includes a hot air blower and a hot air ring disposed at the air outlet end of the hot air blower, and is configured to allow the end face of the reinforced composite tube to be sealed to enter the hot air ring so that the end face to be sealed is melted by blowing hot air onto the end face of the reinforced composite tube through the hot air blower.

[0028] Preferably, the hot air ring has an inner plate and an outer plate arranged radially spaced from each other, defining a hot air duct between the inner plate and the outer plate that can accommodate the end face of the reinforced composite pipe to be sealed, wherein the hot air duct is provided with a baffle ring for guiding the flow of hot air, and / or, the hot air duct has an inner ring air outlet and an outer ring air outlet respectively distributed circumferentially, the total flow area of ​​the inner ring air outlet being greater than the total flow area of ​​the outer ring air outlet.

[0029] Preferably, the sealing device includes a composite pipe support device having a pipe clamp for holding the reinforced composite pipe, the pipe clamp being drivenly connected to a servo motor or stepper motor for driving the reinforced composite pipe to move axially.

[0030] Preferably, both ends of the composite pipe support device are provided with the first heating device and the second heating device, so that the two ends of the reinforced composite pipe can be sealed respectively when the reinforced composite pipe is clamped.

[0031] Through the above technical solution, the sealing method of the present invention uses a first heating device and a second heating device to heat the sealing ring and the end face of the reinforced composite tube to be sealed, thereby facilitating the separate control of the melting process temperature and time, so that the melting state better meets the sealing requirements, thus improving the final welding effect. By using different heating devices, the end face of the sealing ring can be heated for a relatively long time and / or with a relatively high power during the melting process, resulting in a larger melting thickness. Therefore, even if the end face of the reinforced composite tube to be sealed has a small amount of uneven area or protruding reinforcement without grinding, it can still be inserted into the molten sealing ring, thereby eliminating the tube grinding step and effectively improving the sealing efficiency. Attached Figure Description

[0032] Figure 1 This is a process principle diagram of a sealing device for a reinforced composite pipe according to a preferred embodiment of the present invention;

[0033] Figure 2 yes Figure 1 A schematic diagram of the first heating device of the sealing equipment heating the sealing ring;

[0034] Figure 3 yes Figure 1 A schematic diagram of the sealing equipment in which the end face of the reinforced composite pipe to be sealed is inserted into the annular groove of the sealing ring plate;

[0035] Figure 4 This is a schematic diagram of the structure after the reinforced composite pipe is connected to the sealing ring, where the trimming step has not yet been performed;

[0036] Figure 5 yes Figure 1 A schematic diagram of the second heating device of the sealing equipment heating the end face of the reinforced composite pipe to be sealed;

[0037] Figure 6 yes Figure 5 A cross-sectional view of the hot air ring of the second heating device.

[0038] Figure 7 This is a three-dimensional structural diagram of a hot air ring with another structural form;

[0039] Figure 8 yes Figure 7 Left view of the central heating air ring.

[0040] Explanation of reference numerals in the attached figures

[0041] 1-First heating device; 11-Sealing ring retaining plate; 11a-Annular groove; 12-Heating plate; 13-Sealing ring hot press plate; 13a-Hot press plate protruding ring; 14-Hot press heating plate; 15-First sliding guide;

[0042] 2-Second heating device; 21-Hot air blower; 22-Hot air ring; 221-Inner plate; 222-Outer plate; 223-Hot air duct; 224-Wind baffle ring; 225-Inner ring air outlet; 226-Outer ring air outlet;

[0043] 3-Sealing ring; 4-Reinforced composite pipe; 5-Frame; 51-Second sliding guide; 6-Mounting plate; 7-Pipe clamp; 8-Third sliding guide. Detailed Implementation

[0044] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0045] In this invention, unless otherwise stated, directional terms such as "axial" generally refer to the direction along the central axis of the reinforced composite pipe to be sealed, and "circumferential" generally refers to the circumferential direction around the central axis. In this invention, "sealing ring" refers to an annular component used to join to the end face (including the cut surface) of the reinforced composite pipe, which may have the same material as the base pipe of the reinforced composite pipe, such as a high-density polyethylene (HDPE) ring with a wall thickness equal to or slightly greater than that of the reinforced composite pipe.

[0046] Combination Figure 1 As shown, a sealing method for a reinforced composite tube according to a preferred embodiment of the present invention includes a melting step (i.e., step S1) and a welding step (i.e., step S2). In step S1, a first heating device 1 heats a sealing ring 3, causing the end face of the sealing ring 3 used for joining to the reinforced composite tube 4 to melt; a second heating device 2 heats the end face of the reinforced composite tube 4 to be sealed, causing the end face to be sealed to melt. In step S2, the sealing ring 3 and / or the reinforced composite tube 4 are moved so that the molten end face of the sealing ring 3 is coaxially connected to the end face of the reinforced composite tube 4 to be sealed, and held under a predetermined axial pressure for a predetermined time.

[0047] This sealing method utilizes a first heating device 1 and a second heating device 2 to heat the sealing ring 3 and the end face of the reinforced composite tube 4 to be sealed during the melting step. This ensures that their molten state better meets the sealing requirements, thereby improving the final welding effect. Because different heating devices are used, the end face of the sealing ring 3 can be heated for a relatively long time and / or with relatively high power during the melting process, resulting in a larger molten thickness of the sealing ring 3, preventing over-melting of the end face of the reinforced composite tube 4 to be sealed, which is heated by the other heating device. Therefore, even if the end face of the reinforced composite tube 4 to be sealed has a small amount of unevenness or protruding reinforcement (such as steel wire) without grinding, it can still be inserted into the molten sealing ring 3, thus eliminating the need for a grinding step and effectively improving sealing efficiency while ensuring sealing quality.

[0048] Another aspect of the present invention provides a sealing device for reinforced composite pipes, which can be used to perform the sealing method of the present invention. To better understand the technical solution, technical principles, and advantages of the present invention, the sealing method and sealing device will be described below in an interwoven manner.

[0049] As mentioned above, the first heating device 1 and the second heating device 2 are used to heat the sealing ring 3 and the reinforcing composite pipe 4, respectively. Their heating and melting effects directly affect the subsequent welding effect. Therefore, the rational design of the heating device structure and heating method is of great significance for ensuring the sealing quality. Figure 1 and Figure 2As shown, in a preferred embodiment of the present invention, the first heating device 1 includes a sealing ring retainer plate 11, which has an annular groove 11a adapted to accommodate a sealing ring 3 for welding to the end face of the reinforced composite tube 4 to be sealed. Thus, in step S1, the sealing ring 3 can be placed in the annular groove 11a and heated within it until its end face facing the opening of the annular groove 11a (i.e., the end for welding to the reinforced composite tube 4) melts. The limiting effect created by the annular groove 11a during the melting process facilitates prolonged or high-power heating of the end face of the sealing ring 3, thereby achieving a larger melt thickness. This allows even if the end face of the reinforced composite tube 4 to be sealed has a small amount of unevenness or protruding reinforcement without grinding, it can still be inserted into the molten sealing ring 3 during the welding step, thus eliminating the need for a tube grinding step. The annular groove 11a formed on the sealing ring retainer 11 helps the sealing ring 3 remain stable during the heating and melting process, preventing severe warping, radial expansion, or other deformations. By applying heat to the end of the sealing ring 3 facing the opening of the annular groove 11a, the heat transfer for melting becomes more targeted, resulting in uniform heating of the end face of the sealing ring 3. This facilitates adjustment and control of heating time and power, prevents heat loss, and provides greater control over the melting effect. It is understood that although the grinding step can be omitted due to the different heating device and the limiting effect of the annular groove 11a used in this invention, the sealing method of this invention does not preclude performing the grinding step before the melting step. However, even if the grinding step is performed, the sealing method of this invention can reduce the requirements for grinding precision in the grinding step, thus still improving sealing efficiency compared to existing technologies.

[0050] Furthermore, a heat-insulating heating plate 12 can be provided on the side of the sealing ring clamping plate 11 away from the open end of the annular groove 11a. Alternatively, other auxiliary heating devices can be integrated on the sealing ring clamping plate 11, with a heat-insulating temperature of, for example, 100℃-200℃. This can be used to preheat the annular groove 11a and the sealing ring 3 in the melting step, or to maintain the heat in the annular groove 11a during the switching process from the melting step to the welding step, so as to prevent the molten part of the sealing ring 3 from cooling and solidifying before welding, thereby helping to ensure the welding quality.

[0051] Combination Figure 3 and Figure 4As shown, the sealing ring retaining plate 11 with an annular groove 11a is provided, which also facilitates the reliable implementation of the welding step using the annular groove 11a. After the sealing ring 3 is melted to an appropriate degree in the annular groove 11a, under the heat preservation effect of the aforementioned heat preservation heating plate 12, the sealing ring 3 moves to a position coaxial with the reinforced composite pipe 4 to be sealed while maintaining its molten state. Then, the reinforced composite pipe 4 and the sealing ring retaining plate 11 containing the sealing ring 3 move axially relative to each other so that the end face of the reinforced composite pipe 4 to be sealed enters the annular groove 11a, thereby coaxially connecting with the molten end face of the sealing ring 3, and is held under a predetermined axial pressure for a predetermined time. The predetermined axial pressure and predetermined time mentioned here can be selected according to factors such as pipe material and degree of melting. In a preferred embodiment, the predetermined axial pressure can be 0.1MPa-1MPa, and the predetermined time can be 60s-200s. During this process, the inner peripheral wall of the annular groove 11a guides and restricts the flow of molten material at the contact position caused by axial compression, thereby ensuring that the predetermined axial pressure is stably applied to the molten material, thus guaranteeing the welding quality.

[0052] After welding and cooling, the reinforced composite tube 4 is axially moved away from the sealing ring retainer plate 11, thereby causing the sealing ring 3 welded to the reinforced composite tube 4 to exit the annular retainer groove 11a. An anti-stick layer (such as a PTFE coating) can be provided on the surface of the annular retainer groove 11a to facilitate the exit of the sealing ring 3 along with the reinforced composite tube 4. In a preferred embodiment, an anti-stick layer is provided on the entire surface of the sealing ring retainer plate 11. After exiting the annular retainer groove 11a, excess material may remain at the contact point (inner and outer circumference) between the sealing ring 3 and the reinforced composite tube 4. This excess material can be removed using a trimming tool, making the inner and outer surfaces at the contact point flush with the inner and outer walls of the reinforced composite tube 4.

[0053] In this invention, the first heating device 1 can be configured in various suitable structural forms to heat the end face of the sealing ring 3, which is placed in the annular groove 11a of the sealing ring retainer plate 11, facing the opening end of the annular groove 11a. To ensure uniform heating of the end face of the sealing ring 3 and guarantee melting efficiency, in a preferred embodiment of this invention, such as... Figure 1 and Figure 2As shown, the first heating device 1 also includes a sealing ring hot press plate 13, which has a hot press plate protrusion 13a that matches the annular groove 11a. The sealing ring hot press plate 13 can be configured to heat the sealing ring 3 arranged in the annular groove 11a through the hot press plate protrusion 13a. As shown, a hot press heating plate 14 for heating can be provided on the side of the sealing ring hot press plate 13 away from the sealing ring clamping plate 11, or other heating elements (such as heating tubes) can be integrated in the sealing ring hot press plate 13. The heat generated can be transferred through the sealing ring hot press plate 13 and applied to the end face of the sealing ring 3 through the hot press plate protrusion 13a. Therefore, in the melting step, after the sealing ring 3 is placed into the annular groove 11a of the sealing ring retaining plate 11, the sealing ring hot pressing plate 13 moves relative to the sealing ring retaining plate 11, so that at least a portion of the hot pressing plate protrusion 13a enters the annular groove 11a and abuts against the sealing ring 3 placed in the annular groove 11a, thereby heating the end face of the sealing ring 3 facing the hot pressing plate protrusion 13a, causing the end face to melt. Figure 1 In the preferred embodiment shown, the sealing ring retaining plate 11 of the first heating device 1 is arranged to move only along a direction perpendicular to the central axis of the reinforced composite tube 4 (along the second sliding guide 51 described later) to switch between the melting position and the welding position, while it cannot move relative to the frame 5 in a direction parallel to the central axis of the reinforced composite tube 4. Thus, the sealing ring hot press plate 13 of the first heating device is arranged to move towards or away from the sealing ring retaining plate 11 in the melting position along a direction parallel to the central axis of the reinforced composite tube 4 (in the direction indicated by arrow A) along the first sliding guide 15, such as a guide rail or sliding rod. In other embodiments, other arrangements may be used to allow relative movement between the sealing ring hot press plate 13 and the sealing ring retaining plate 11, so that the hot press plate protrusion 13a enters the annular retaining groove 11a. In order to ensure that the end face of the sealing ring 3 is melted to a suitable state, the temperature of the hot press plate protrusion ring 13a can be maintained at 200℃-220℃ during the melting step, and the holding time against the sealing ring 3 is 80s-200s.

[0054] After melting, the sealing ring hot press plate 13 and the sealing ring retaining plate 11 move away from each other, allowing the hot press plate protrusion 13a to exit from the annular retaining groove 11a, and then the sealing ring retaining plate 11 to move to a welding position coaxial with the reinforced composite pipe 4 to be sealed. Here, an anti-stick layer (such as a polytetrafluoroethylene coating) can be provided on the surface of the hot press plate protrusion 13a to prevent the sealing ring 3 from exiting from the annular retaining groove 11a along with the hot press plate protrusion 13a. In a preferred embodiment, an anti-stick layer is provided on the entire surface of the sealing ring hot press plate 13. Additionally, chamfers can be formed at the opposing ends of the hot press plate protrusion 13a and the annular retaining groove 11a to facilitate their insertion.

[0055] In the aforementioned first heating device 1, the sealing ring clamping plate 11 and the sealing ring hot pressing plate 13 can be made of materials with good thermal conductivity, such as aluminum or copper. For reinforced composite pipes of different diameters or wall thicknesses, sealing ring clamping plates 11 and sealing ring hot pressing plates 13 of different specifications can be replaced to adapt to the heating and melting process of sealing rings 3 of corresponding sizes.

[0056] Combination Figure 1 , Figures 5 to 8 As shown, in a preferred embodiment of the sealing method and sealing device of the present invention, hot air is used to heat the end face of the reinforced composite pipe 4 to be sealed, so as to melt it. Specifically, the second heating device 2 for heating the end face of the reinforced composite pipe 4 to be sealed may include a hot air blower 21, which can blow hot air onto the end face of the reinforced composite pipe 4 to be sealed, so as to heat it to melt the end face to be sealed. By using hot air heating, the heating temperature can be lower than the heating temperature of the sealing ring 3, such as 100℃-150℃, so as to avoid excessive melting of the end face of the reinforced composite pipe 4 to be sealed. The hot air blower 21 mentioned here is usually an industrial hot air blower, the composition and working principle of which are well known to those skilled in the art and will not be described in detail here.

[0057] Furthermore, in order to ensure that the hot air blown out by the hot air blower 21 is evenly applied to all parts of the end face of the reinforced composite tube 4 to be sealed, a hot air ring 22 can be connected to the air outlet end of the hot air blower 21. During the melting process, the reinforced composite tube 4 can be moved relative to the hot air blower 21 so that the end face to be sealed enters the hot air ring 22, thereby guiding the hot air to be evenly applied to all circumferential parts of the end face to be sealed.

[0058] Specifically, Figure 5 and Figure 6 A cross-sectional view of a hot air ring 22 used in a preferred embodiment of the present invention is shown. The hot air ring 22 includes an air inlet connected to the air outlet end of a hot air blower 21, a tapered portion extending gradually from the air inlet, and an extension portion extending from the tapered portion, adapted to allow the reinforcing composite tube 4 to enter the hot air ring 22. The hot air ring 22 has an inner plate 221 and an outer plate 222 radially spaced from each other, defining a hot air duct 223 between the inner plate 221 and the outer plate 222. Hot air blown by the hot air blower 21 is delivered through the hot air duct 223 to the end face of the reinforcing composite tube 4 to be sealed, i.e., during the melting step, the end face of the reinforcing composite tube 4 to be sealed extends into the space between the inner plate 221 and the outer plate 222. The radial dimension of the hot air duct 223 can be set to be slightly larger than the wall thickness of the reinforcing composite tube 4 so that the reinforcing composite tube 4 can be inserted therein. In addition, depending on the specifications of the sealed reinforced composite pipe 4, hot air rings 22 of different sizes can be replaced.

[0059] Heat tends to diffuse radially outward during transfer through the hot air duct 223, which may lead to uneven heating at locations with different wall thicknesses in the reinforced composite pipe 4. Therefore, a hot air guiding structure can be installed within the hot air duct 223 to ensure that heat is applied evenly to the reinforced composite pipe 4. Figure 5 and Figure 6 In the preferred embodiment shown, a baffle ring 224 is provided inside the hot air duct 223. The baffle ring 224 guides the hot air to flow towards the inner plate 221, so as to reduce or eliminate the adverse effects caused by the outward diffusion of heat.

[0060] exist Figure 7 and Figure 8 In another preferred embodiment shown, the hot air ring 22 can be provided with multiple inner ring air outlets 225 and multiple outer ring air outlets 226 distributed circumferentially in the hot air duct 223. The distribution density of the inner ring air outlets 225 is greater than that of the outer ring air outlets 226, thereby guiding more hot air out from the portion near the inner layer of the reinforced composite pipe 4, ensuring uniform heating of the end face to be sealed. It is understood that the inner ring air outlets 225 and outer ring air outlets 226 shown are both formed as circular holes and are provided in multiples. In other embodiments, they can also be formed in other shapes, as long as the total flow area of ​​the inner ring air outlets 225 is greater than the total flow area of ​​the outer ring air outlets 226. Furthermore, the aforementioned baffle ring 224 and this air outlet arrangement can be simultaneously applied to the same hot air ring 22.

[0061] In the sealing method provided by this invention, the end face of the reinforced composite tube 4 to be sealed and the end face of the sealing ring 3 for joining to the reinforced composite tube 4 need to be heated separately in the melting step, and the sealing ring 3 is then coaxially connected to the reinforced composite tube 4 in the subsequent welding step. To improve sealing efficiency and avoid solidification of the molten material due to excessive switching time during step transitions, the relative positions and movement relationships of the various parts need to be rationally arranged. Here, refer to... Figure 1 As shown, the sealing ring clamping plate 11 and the second heating device 2, including, for example, a hot air blower 21, can be mounted on the same mounting plate 6. The mounting plate 6 is slidably mounted on the frame 5 via a second sliding guide 51, such as a guide rail or a sliding rod, so that the sealing ring clamping plate 11 and the second heating device 2 can slide in a direction perpendicular to the central axis of the reinforced composite pipe 4 (in the direction indicated by arrow B). When the sliding is such that the annular groove 11a of the sealing ring clamping plate 11 is aligned with the hot press plate protrusion 13a of the sealing ring hot press plate 13, the hot air ring 22 connected to the hot air blower 21 is coaxial with the reinforced composite pipe 4, thereby enabling simultaneous heating of the sealing ring 3 and the reinforced composite pipe 4.

[0062] After heating and melting are complete, the mounting plate 6 slides on the frame 5, and the hot air blower 21 moves out from its coaxial position with the reinforced composite tube 4. Simultaneously, the sealing ring clamping plate 11 moves so that the sealing ring 3 within it is coaxial with the reinforced composite tube 4, thereby achieving coaxial connection through axial relative movement. During this process, a servo motor or stepper motor can be used to drive the mounting plate 6 to slide, allowing for precise control of its movement position and speed, which helps ensure sealing quality. With this arrangement, the sealing ring 3 and the reinforced composite tube 4 can be heated simultaneously during the sealing process, and the transition from the melting step to the welding step can be rapid, reducing heat loss during the switching process.

[0063] During the sealing process, the reinforced composite tube 4 to be sealed should be properly supported so as to be coaxially connected with the sealing ring 3. In the preferred embodiment shown in the figure, the sealing device also includes a composite tube support device, which has a tube clamp 7 for holding the reinforced composite tube 4. The tube clamp 7 is driven by a servo motor or stepper motor for driving the reinforced composite tube 4 to move axially (in the direction shown by arrow C in the figure). For example, it can be driven so that the tube clamp 7 drives the reinforced composite tube 4 it holds to slide along the third sliding guide 8. Thus, when the sealing ring 3 moves to a position coaxial with the reinforced composite tube 4, the reinforced composite tube 4 can be driven to move toward the sealing ring 3 and be fused together in the annular groove 11a of the sealing ring clamping plate 11.

[0064] Continue to refer to Figure 1 As shown, in order to further improve production efficiency, the first heating device 1 and the second heating device 2 can be provided at both ends of the composite pipe support device. Thus, when the reinforced composite pipe 4 is clamped, both ends of the reinforced composite pipe can be sealed respectively without changing its clamping direction.

[0065] To better understand the sealing method and sealing device of the present invention, the sealing process is illustrated below with reference to the preferred embodiments:

[0066] The sealing ring hot press plate 13 is heated to the required temperature (200℃-220℃) by the hot press heating plate 14. The sealing ring 3 is placed in the annular groove 11a of the sealing ring clamping plate 11. The hot press heating plate 14, which is fixed to the sealing ring hot press plate 13, is driven to move towards the sealing ring clamping plate 11, so that the hot press plate protrusion 13a moves into the annular groove 11a and adheres tightly to the surface of the sealing ring 3. This is maintained for 80s-200s, so that the end face of the sealing ring 3 melts. At the same time, the reinforced composite pipe 4 is moved into the hot air ring 22 by the pipe clamp 7. Hot air (temperature 100℃-150℃) is blown to the end face of the reinforced composite pipe 4, so that the plastic at the end face melts.

[0067] After the end faces of the sealing ring 3 and the reinforced composite tube 4 are melted, the sealing ring hot press plate 13 is quickly removed from the annular groove 11a of the sealing ring clamping plate 11 while it is still in the molten state, and the reinforced composite tube 4 is removed from the hot air ring 22. The sealing ring clamping plate 11 (with sealing ring 3) is then moved to a position coaxial with the reinforced composite tube 4.

[0068] Driven by the pipe clamp 7, the reinforced composite pipe 4 moves so that its molten end face to be sealed enters the annular groove 11a of the sealing ring clamping plate 11, and contacts the sealing ring 3, whose end face is in a molten state, and holds pressure for 60s-200s (holding pressure 0.1MPa-1MPa). After cooling for a period of time, the reinforced composite pipe 4 is retracted. At this time, the sealing ring 3 and the reinforced composite pipe 4 are fused together and detach from the annular groove 11a.

[0069] Finally, use a trimming tool to remove excess material at the junction of the sealing ring 3 and the reinforced composite pipe 4.

[0070] The sealing process can complete the sealing of one end within 6 minutes.

[0071] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A sealing method for reinforced composite pipes, characterized in that, Includes the following steps: S1. The sealing ring (3) is heated using the first heating device (1) so that the end face of the sealing ring (3) used to join the reinforced composite tube (4) melts; the end face of the reinforced composite tube (4) to be sealed is heated using the second heating device (2) so that the end face to be sealed melts. S2. Move at least one of the sealing ring (3) and the reinforcing composite tube (4) so ​​that the molten end face of the sealing ring (3) is coaxially connected with the end face to be sealed of the reinforcing composite tube (4) and held for a predetermined time under a predetermined axial pressure; The second heating device (2) includes a hot air blower (21). In step S1, the hot air blower (21) is used to blow hot air onto the end face of the reinforced composite pipe (4) to be sealed, so as to heat the end face to be sealed and melt it. The second heating device (2) includes a hot air ring (22) disposed at the air outlet end of the hot air blower (21). In step S1, at least one of the reinforced composite pipe (4) and the hot air blower (21) is moved so that the end face of the reinforced composite pipe (4) to be sealed enters the hot air ring (22). The hot air ring (22) has an inner plate (221) and an outer plate (222) arranged radially apart from each other to define a hot air duct (223) between the inner plate (221) and the outer plate (222). In step S1, the end face of the reinforced composite tube (4) to be sealed is made to enter the hot air duct (223). The hot air duct (223) is provided with a baffle ring (224) for guiding the flow of hot air, and / or the hot air duct (223) has an inner ring air outlet (225) and an outer ring air outlet (226) distributed circumferentially, respectively. The total flow area of ​​the inner ring air outlet (225) is greater than the total flow area of ​​the outer ring air outlet (226).

2. The sealing method for the reinforced composite pipe according to claim 1, characterized in that, The first heating device (1) includes a sealing ring plate (11) with an annular groove (11a). In step S1, the sealing ring (3) is placed in the annular groove (11a) and heated in the annular groove (11a) to melt the end face of the sealing ring (3) facing the opening end of the annular groove (11a).

3. The sealing method for the reinforced composite pipe according to claim 2, characterized in that, A heat-insulating heating plate (12) is provided on the side of the sealing ring plate (11) away from the opening end of the annular groove (11a). In step S1 and / or S2, the heat-insulating heating plate (12) transfers heat to the sealing ring (3) placed in the annular groove (11a) through the sealing ring plate (11).

4. The sealing method for the reinforced composite pipe according to claim 2, characterized in that, The first heating device (1) further includes a sealing ring hot press plate (13), which has a hot press plate protrusion (13a) that matches the annular groove (11a). In step S1, the sealing ring hot press plate (13) and the sealing ring clamping plate (11) move relative to each other so that at least part of the hot press plate protrusion (13a) enters the annular groove (11a) and abuts against the sealing ring (3) placed in the annular groove (11a), so as to heat the end face of the sealing ring (3) facing the hot press plate protrusion (13a) through the hot press plate protrusion (13a) and melt the end face.

5. The sealing method for the reinforced composite pipe according to claim 4, characterized in that, In step S1, the temperature of the hot press plate protrusion ring (13a) is 200℃-220℃, and / or the holding time of the hot press plate protrusion ring (13a) against the sealing ring (3) is 80s-200s.

6. The sealing method for the reinforced composite pipe according to claim 4, characterized in that, An anti-stick layer is provided on the surface of the hot press plate protrusion ring (13a) and / or the annular groove (11a).

7. The sealing method for the reinforced composite pipe according to claim 2, characterized in that, In step S2, at least one of the sealing ring (3) and the reinforcing composite tube (4) is moved such that the end face of the reinforcing composite tube (4) to be sealed enters the annular groove (11a) to coaxially connect with the molten end face of the sealing ring (3).

8. The sealing method for the reinforced composite pipe according to claim 2, characterized in that, The second heating device (2) and the sealing ring clamping plate (11) are mounted on the same mounting plate (6), which is slidably disposed on the frame (5). In step S2, the sealing ring (3) placed in the annular groove (11a) is made coaxial with the reinforcing composite pipe (4) by sliding the mounting plate (6) on the frame (5) in a direction perpendicular to the axial direction of the reinforcing composite pipe (4).

9. The sealing method for the reinforced composite pipe according to claim 1, characterized in that, In step S1, the end face of the reinforced composite tube (4) to be sealed is heated to a temperature of 100°C-150°C.

10. The sealing method for the reinforced composite pipe according to claim 1, characterized in that, In step S2, the predetermined axial pressure is 0.1MPa-1MPa, and the predetermined time is 60s-200s.

11. The sealing method for the reinforced composite pipe according to claim 1, characterized in that, In step S2, at least one of the sealing ring (3) and the reinforced composite tube (4) is moved by a servo motor or a stepper motor.

12. The sealing method for the reinforced composite pipe according to claim 1, characterized in that, The sealing method also includes step S3, which is performed after step S2: removing excess material at the junction of the sealing ring (3) and the reinforced composite tube (4) using a trimming tool.

13. A sealing device for reinforced composite pipes, characterized in that, The device includes a first heating device (1) for heating the sealing ring (3) and a second heating device (2) for heating the end face of the reinforced composite tube (4) to be sealed. The first heating device (1) includes a sealing ring retaining plate (11) with an annular groove (11a) and a sealing ring hot press plate (13) with a hot press plate protrusion (13a) that matches the annular groove (11a). The sealing ring hot press plate (13) and the sealing ring retaining plate (11) can move relative to each other so that at least part of the hot press plate protrusion (13a) enters the annular groove (11a) and abuts against the sealing ring (3) placed in the annular groove (11a) so as to heat the end face of the sealing ring (3) facing the hot press plate protrusion (13a) through the hot press plate protrusion (13a) and melt the end face. The second heating device (2) includes a hot air blower (21) and a hot air ring (22) disposed at the air outlet end of the hot air blower (21), and is configured to allow the end face of the reinforced composite tube (4) to be sealed to enter the hot air ring (22) so that the end face to be sealed is melted by blowing hot air to the end face of the reinforced composite tube (4) through the hot air blower (21); The hot air ring (22) has an inner plate (221) and an outer plate (222) arranged radially apart from each other, so as to define a hot air duct (223) between the inner plate (221) and the outer plate (222) to accommodate the end face of the reinforced composite tube (4) to be sealed, wherein the hot air duct (223) is provided with a baffle ring (224) for guiding the flow of hot air, and / or, the hot air duct (223) has an inner ring air outlet (225) and an outer ring air outlet (226) respectively distributed circumferentially, the total flow area of ​​the inner ring air outlet (225) is greater than the total flow area of ​​the outer ring air outlet (226).

14. The sealing device for reinforced composite pipes according to claim 13, characterized in that, An anti-stick layer is provided on the surface of the hot press plate protrusion ring (13a) and / or the annular groove (11a).

15. The sealing device for reinforced composite pipes according to claim 13, characterized in that, The sealing device includes a mounting plate (6) slidably mounted on a frame (5), on which the second heating device (2) and the sealing ring clamping plate (11) are mounted, such that the sealing ring (3) placed in the annular groove (11a) is coaxial with the reinforcing composite pipe (4) by sliding the mounting plate (6) on the frame (5) in a direction perpendicular to the axial direction of the reinforcing composite pipe (4).

16. The sealing device for reinforced composite pipes according to claim 13, characterized in that, The sealing device includes a composite pipe support device having a pipe clamp (7) for holding the reinforced composite pipe (4), and the pipe clamp (7) is drivenly connected to a servo motor or stepper motor for driving the reinforced composite pipe (4) to move axially.

17. The sealing device for reinforced composite pipes according to claim 16, characterized in that, Both ends of the composite pipe support device are provided with the first heating device (1) and the second heating device (2) so that the two ends of the reinforced composite pipe (4) can be sealed respectively when the reinforced composite pipe (4) is clamped.

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