CN115816808A - Sealing method and sealing equipment for reinforced composite pipe - Google Patents

Abstract

The invention relates to the field of pipeline manufacturing, and discloses a sealing method and sealing equipment for a reinforced composite pipe, wherein the sealing method comprises the following steps: s1, heating a sealing ring (3) by using a first heating device (1) to melt the end face of the sealing ring (3) for jointing to the reinforced composite pipe (4); heating the end face to be sealed of the reinforced composite pipe (4) by using a second heating device (2) to melt the end face to be sealed; s2, moving at least one of the sealing ring (3) and the reinforced composite pipe (4) to enable the fused end face of the sealing ring (3) to be coaxially connected with the end face to be sealed of the reinforced composite pipe (4), and keeping for a preset time under a preset axial pressure. The sealing method of the invention is convenient for leading the melting state to better meet the sealing requirement, is beneficial to improving the final welding effect, is convenient for omitting the step of grinding the pipe by leading the melting thickness of the sealing ring to be larger, and effectively improves the sealing efficiency.

Description

Sealing method and sealing equipment for reinforced composite pipe

Technical Field

The invention relates to a pipeline manufacturing method, in particular to a sealing method of a reinforced composite pipe. In addition, the invention also relates to sealing equipment for the reinforced composite pipe.

Background

A reinforced composite pipe, generally referred to as a composite pipe reinforced with a reinforcement, typically includes an inner plastic pipe, a reinforcement layer (reinforcement layer), and an outer plastic pipe arranged in this order from inside to outside. The reinforcing body layer in the reinforced composite pipe can be a steel wire mesh, a steel belt mesh or an aluminum belt mesh and the like formed by winding or welding.

In order to avoid the damage of oxidation, corrosion and the like caused by the fact that the reinforcing body in the reinforced composite pipe is exposed to air, the cut surface of the pipe can be sealed by the plastic ring, so that the reinforcing body is prevented from being oxidized at the position of the cut end surface, the pipe can be stored for a long time, and the reinforcing body can be isolated from the conveyed fluid in a pipeline system, so that the fluid can not enter the reinforcing layer to damage the pipe body. Therefore, sealing the end faces of the reinforced composite pipe is of great significance to ensure the service life and the storage life.

At present, the sealing process of the reinforced composite pipe is generally carried out on a pipe grinding and sealing unit, and the pipe grinding and sealing unit comprises a pipe clamp, a heating plate, a sealing ring chuck, a pipe grinding device and the like which are coaxially arranged. In the sealing process, the pipe clamp clamps the reinforced composite pipe to be sealed, the heating plate and the sealing ring chuck are withdrawn out of the central axis of the reinforced composite pipe, and therefore the pipe grinding device is utilized to grind and flatten the end face of the reinforced composite pipe to be sealed; then, clamping a sealing ring (a plastic ring with the wall thickness equivalent to that of the reinforced composite pipe) on a sealing ring chuck, resetting the sealing ring and the heating plate to a position coaxial with the reinforced composite pipe, and axially driving the reinforced composite pipe to move towards the heating plate, so that the heating plate melts the end surface to be sealed of the reinforced composite pipe and the end surface of the sealing ring, which are opposite to each other, for jointing to the reinforced composite pipe; and then, withdrawing the heating plate, continuing to axially drive the reinforced composite pipe to be connected with the end face of the sealing ring and keeping for a period of time under a certain pressure, so that the material to be melted is cooled and solidified, and the sealing ring is welded and covers the end face of the reinforced composite pipe.

The existing sealing method has the defects that the reinforced composite pipe to be sealed and the sealing ring have different structural compositions, the reinforced composite pipe and the sealing ring have different heat requirements for melting, and the end surfaces which are connected with each other are heated by the same heating plate, so that the respective melting states of the reinforced composite pipe and the sealing ring are difficult to meet the sealing requirement, and the final welding effect is poor. In this case, in order to avoid adverse effects caused by an unsatisfactory melting effect as much as possible, the end face to be sealed of the reinforced composite pipe needs to be polished (pipe-ground) before the sealing ring is axially connected to the reinforced composite pipe, resulting in a low sealing efficiency.

Disclosure of Invention

The invention aims to solve the problems of unsatisfactory welding effect and low sealing efficiency in the sealing process of the reinforced composite pipe in the prior art, and provides a sealing method of the reinforced composite pipe, which is convenient for improving the welding effect of the end face to be sealed of the reinforced composite pipe and a sealing ring and can effectively improve the sealing efficiency.

In order to achieve the above object, an aspect of the present invention provides a method for sealing a reinforced composite pipe, including the steps of:

s1, heating a sealing ring by using a first heating device to melt the end face of the sealing ring for being jointed to the reinforced composite pipe; heating the end face to be sealed of the reinforced composite pipe by using a second heating device to melt the end face to be sealed;

s2, moving at least one of the sealing ring and the reinforced composite pipe to enable the fused end face of the sealing ring to be coaxially connected with the end face to be sealed of the reinforced composite pipe, and keeping for a preset time under a preset axial pressure.

Preferably, the first heating device includes a sealing ring clamping plate formed with a ring clamping groove, and in step S1, the sealing ring is placed in the ring clamping groove and heated in the ring clamping groove so that an end surface of the sealing ring facing an opening end of the ring clamping groove is melted.

Preferably, a heat preservation heating plate is arranged on one side of the sealing ring clamping plate, which is away from the opening end of the annular clamping groove, and in the step S1 and/or the step S2, the heat preservation heating plate transfers heat to the sealing ring arranged in the annular clamping groove through the sealing ring clamping plate.

Preferably, first heating device still includes seals the ring hot pressboard, should seal the ring hot pressboard be formed with the hot pressboard bulge loop that ring slot matches, in step S1, seal the ring hot pressboard with seal ring cardboard relative motion for making at least part the hot pressboard bulge loop gets into in the ring slot and support and arrange in ring slot seal the ring to should seal the orientation of ring through this hot pressboard bulge loop heating the terminal surface of hot pressboard bulge loop, and make this terminal surface melting.

Preferably, in step S1, the temperature of the hot pressing plate protruding ring is 200 ℃ to 220 ℃, and/or the holding time of the hot pressing plate protruding ring against the sealing ring is 80S to 200S.

Preferably, an anti-sticking layer is arranged on the surface of the hot pressing plate convex ring and/or the annular clamping groove.

Preferably, in step S2, at least one of the sealing ring and the reinforced composite pipe is moved so that the end face to be sealed of the reinforced composite pipe enters the annular clamping groove to be coaxially connected with the melted end face of the sealing ring.

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

Preferably, the second heating device includes a hot air blower, and in step S1, hot air is blown to the end surface to be sealed of the reinforced composite pipe by the hot air blower to heat the end surface to be sealed so as to melt the end surface to be sealed.

Preferably, in step S1, the end face to be sealed of the reinforced composite pipe is heated to have a temperature of 100 ℃ to 150 ℃.

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

Preferably, the hot air ring has an inner plate and an outer plate which are radially spaced from each other, so as to define a hot air duct between the inner plate and the outer plate, and in step S1, the end surface to be sealed of the reinforced composite pipe enters the hot air duct, wherein a wind blocking ring for guiding hot air to flow is provided in the hot air duct, and/or the hot air duct has an inner ring air outlet and an outer ring air outlet which are circumferentially distributed, respectively, and a total flow area of the inner ring air outlet is larger than a total flow area of the outer ring air outlet.

Preferably, in step S2, the predetermined axial pressure is 0.1MPa to 1MPa, and the predetermined time is 60S to 200S.

Preferably, in step S2, at least one of the sealing ring and the reinforced composite pipe is driven to move by a servo motor or a stepping motor.

Preferably, the sealing method further includes a step S3 performed after the step S2: and removing the redundant material at the joint position of the sealing ring and the reinforced composite pipe by using an edge trimming tool.

The invention provides sealing equipment for a reinforced composite pipe, which comprises 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, wherein the first heating device comprises a sealing ring clamping plate and a sealing ring hot pressing plate, the sealing ring clamping plate is provided with a ring clamping groove, the sealing ring hot pressing plate is provided with a hot pressing plate convex ring matched with the ring clamping groove, and the sealing ring hot pressing plate and the sealing ring clamping plate can move relatively to enable at least part of the hot pressing plate convex ring to enter the ring clamping groove and abut against the sealing ring arranged in the ring clamping groove, so that the end face, facing the hot pressing plate convex ring, of the sealing ring is heated through the hot pressing plate convex ring, and the end face is fused.

Preferably, an anti-sticking layer is arranged on the surface of the hot pressing plate convex ring and/or the annular clamping groove.

Preferably, the sealing apparatus includes a mounting plate slidably disposed on the frame, and the second heating device and the sealing ring chucking plate are mounted on the mounting plate so that the sealing ring disposed in the annular clamping groove can be made coaxial with the reinforced composite pipe by sliding the mounting plate on the frame in a direction perpendicular to an axial direction of the reinforced composite pipe.

Preferably, the second heating device includes an air heater and a hot air ring disposed at an air outlet end of the air heater, and is configured to allow the end face to be sealed of the reinforced composite pipe to enter the hot air ring, so that the end face to be sealed of the reinforced composite pipe is melted by blowing hot air to the end face to be sealed of the reinforced composite pipe by the air heater.

Preferably, the hot air ring has an inner plate and an outer plate which are radially spaced from each other, so as to define a hot air duct which can accommodate the end face to be sealed of the reinforced composite pipe between the inner plate and the outer plate, wherein a wind blocking ring for guiding hot air to flow is arranged in the hot air duct, and/or the hot air duct has an inner ring air outlet and an outer ring air outlet which are respectively distributed along the circumferential direction, and the total through-flow area of the inner ring air outlet is larger than that of the outer ring air outlet.

Preferably, the sealing device comprises a composite pipe supporting device, the composite pipe supporting device is provided with a pipe clamp used for clamping the reinforced composite pipe, and the pipe clamp is in transmission connection with a servo motor or a stepping motor used for driving the reinforced composite pipe to move along the axial direction.

Preferably, the first heating device and the second heating device are respectively arranged at two ends of the composite pipe supporting device, so that two ends of the reinforced composite pipe can be respectively sealed in a clamped state.

Through the technical scheme, the sealing method of the invention respectively utilizes the first heating device and the second heating device to heat the sealing ring and the end face to be sealed of the reinforced composite pipe, thereby facilitating the respective control of the melting process temperature and time, leading the melting state to better meet the sealing requirement and being beneficial to improving the final welding effect; utilize different heating device, can heat the terminal surface of sealing the ring with relative long time and/or power in the melting process for its fused thickness is great, from this, even the terminal surface of treating of reinforcing composite tube to seal has not ground and small amount unevenness region or outstanding reinforcement, also can penetrate to the fused seal ring in, thereby can save the mill pipe step, effectively promoted and sealed efficiency.

Drawings

FIG. 1 is a process schematic of a reinforced composite pipe closure apparatus according to a preferred embodiment of the present invention;

FIG. 2 is a schematic view of a first heating means of the sealing apparatus of FIG. 1 while heating the sealing ring;

FIG. 3 is a schematic view of the sealing apparatus of FIG. 1 when the end face of the reinforced composite pipe to be sealed is inserted into the ring groove of the sealing ring clamping plate;

FIG. 4 is a schematic view of the reinforced composite pipe after being attached to the sealing ring, wherein the trimming step has not been performed;

FIG. 5 is a schematic view of a second heating device of the sealing apparatus of FIG. 1 when heating the end surface of the reinforced composite pipe to be sealed;

fig. 6 is a cross-sectional structural view of a hot air ring of the second heating device in fig. 5;

FIG. 7 is a schematic perspective view of a hot air ring of another construction;

fig. 8 is a left side view of the hot blast ring of fig. 7.

Description of the reference numerals

1-a first heating device; 11-sealing ring snap-gauge; 11 a-ring slot; 12-heat preservation heating plate; 13-sealing ring hot pressing plate; 13 a-hot platen convex ring; 14-hot pressing and heating plates; 15-a first sliding guide;

2-a second heating device; 21-a hot air blower; 22-hot air ring; 221-inner plate; 222-an outer plate; 223-hot air duct; 224-a wind-shield ring; 225-inner ring air outlet; 226-outer ring air outlet;

3-sealing ring; 4-reinforced composite pipe; 5-a frame; 51-a second sliding guide; 6, mounting a plate; 7-pipe clamp; 8-third sliding guide.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, where nothing is said to the contrary, the use of an orientation word such as "axial" generally refers to a direction along the central axis of the reinforced composite pipe to be sealed, and "circumferential" generally refers to a circumferential direction around the central axis. In the present invention, the "sealing ring" refers to an annular member for joining to an end face (including a cut surface) of the reinforced composite pipe, which may be of the same material as the base pipe of the reinforced composite pipe, such as a High Density Polyethylene (HDPE) ring having a wall thickness comparable to or slightly greater than that of the reinforced composite pipe.

Referring to fig. 1, a sealing method of a reinforced composite pipe according to a preferred embodiment of the present invention includes a fusing step (i.e., step S1) and a fusing step (i.e., step S2). Wherein, in step S1, the sealing ring 3 is heated by the first heating device 1 so that the end face of the sealing ring 3 for joining to the reinforced composite pipe 4 is melted; and heating the end surface to be sealed of the reinforced composite pipe 4 by using the second heating device 2 so as to melt the end surface to be sealed. In step S2, the sealing ring 3 and/or the reinforced composite tube 4 are moved such that the melted end face of the sealing ring 3 and the end face to be sealed of the reinforced composite tube 4 are brought into coaxial contact and held under a predetermined axial pressure for a predetermined time.

According to the sealing method, the first heating device 1 and the second heating device 2 are respectively utilized to heat the sealing ring 3 and the end face to be sealed of the reinforced composite pipe 4 in the melting step, so that the melting state of the reinforced composite pipe can better meet the sealing requirement, and the final welding effect can be improved. Because different heating devices are used, the end face of the sealing ring 3 can be heated for a relatively long time and/or power in the melting process, so that the thickness of the sealing ring 3 which is melted is large, and the end face to be sealed of the reinforced composite pipe 4 which is heated by another heating device is not melted excessively. Therefore, even if the end face to be sealed of the reinforced composite pipe 4 is not polished and has a small uneven area or a protruding reinforcement (such as a steel wire), the end face can penetrate into the fused sealing ring 3, so that the pipe grinding step can be omitted, and the sealing efficiency is effectively improved on the premise of ensuring the sealing quality.

Another aspect of the present invention also provides a sealing apparatus for reinforced composite pipes that may be used to perform the sealing method of the present invention. For a better understanding of the technical solutions, technical principles and advantages of the present invention, the sealing method and the sealing apparatus will be explained below in an interpenetrating manner.

As mentioned above, the first heating device 1 and the second heating device 2 are respectively used for heating the sealing ring 3 and the reinforced composite pipe 4, and the heating and melting effect thereof directly affects the subsequent welding effect, so that the reasonable arrangement of the structure and the heating mode of the heating devices has important significance for ensuring the sealing quality. In a preferred embodiment of the invention, shown in fig. 1 and 2 in combination, the first heating device 1 comprises a sealing ring card 11, the sealing ring card 11 being formed with an annular clamping groove 11a, the annular clamping groove 11a being adapted to receive a sealing ring 3 for welding to an end face of the reinforced composite tube 4 to be sealed. Thus, in step S1, sealing ring 3 may be placed in ring groove 11a, and sealing ring 3 may be heated in ring groove 11a such that its end face facing the open end of ring groove 11a (i.e., the end for welding to reinforced composite pipe 4) is melted. Through the limiting effect generated by the annular clamping groove 11a in the melting process, the end face of the sealing ring 3 is conveniently heated for a long time or with high power, so that a larger melting thickness is obtained, and even if the end face to be sealed of the reinforced composite pipe 4 is not polished and has a small uneven area or a protruding reinforcing body, the end face to be sealed can penetrate into the melted sealing ring 3 in the welding step, so that the pipe grinding step is favorably omitted. The annular clamping groove 11a formed in the sealing ring clamping plate 11 can be beneficial to keeping the sealing ring 3 stable in the heating and melting process, and deformation such as severe warping and radial expansion can not occur; apply the heat through the one end towards the open end of ring channel 11a at ring 3 that seals, can make the heat transfer that is used for the melting have more pertinence for the terminal surface that seals ring 3 is heated evenly, is convenient for adjust and control heating time and heating power, and can avoid the heat to scatter and disappear, has higher controllability to the melting effect. It will be appreciated that although the tube grinding step may be omitted due to the different heating means and the limiting effect of ring groove 11a employed in the present invention, the capping method of the present invention does not preclude the tube grinding step from being performed prior to the melting step. However, even if this tube grinding step is performed, the sealing method of the present invention can reduce the requirement for the fineness of grinding in the tube grinding step, and thus can also improve the sealing efficiency as compared with the prior art.

Further, a heat preservation heating plate 12 may be disposed on a side of the sealing ring clamping plate 11 away from the opening end of the ring clamping groove 11a, or another auxiliary heating device may be integrally disposed on the sealing ring clamping plate 11, and the heat preservation temperature may be, for example, 100 ℃ to 200 ℃, so that the ring clamping groove 11a and the sealing ring 3 may be preheated in the melting step, or the heat in the ring clamping groove 11a may be maintained in the switching process from the melting step to the welding step, and the sealing ring 3 is prevented from being cooled and solidified before being welded, thereby facilitating to ensure the welding quality.

As shown in fig. 3 and 4, the sealing ring card 11 having the ring card slot 11a is provided, and it is also advantageous to reliably perform the welding step using the ring card slot 11a. After the sealing ring 3 is melted to a proper degree in the annular clamping groove 11a, under the heat preservation effect of the heat preservation heating plate 12, the sealing ring 3 moves to a position coaxial with the reinforced composite tube 4 to be sealed in a state of keeping melting, and then the reinforced composite tube 4 and the sealing ring clamping plate 11 containing the sealing ring 3 axially move relatively to make the end face to be sealed of the reinforced composite tube 4 enter the annular clamping groove 11a, so that the end face to be sealed is coaxially connected with the melted end face of the sealing ring 3, and the predetermined time is kept under a predetermined axial pressure. The predetermined axial pressure and the predetermined time may be selected according to the pipe material, the melting degree, and the like, and in a preferred embodiment, the predetermined axial pressure may be 0.1MPa to 1MPa, and the predetermined time may be 60s to 200s. In this process, the inner circumferential wall of the ring-shaped groove 11a guides and restricts the flow of the molten material at the meeting position due to the axial pressing, so that the predetermined axial pressure applied can be stably applied to the molten material, thereby ensuring the welding quality.

After the welding is completed and the pipe is cooled, the reinforced composite pipe 4 is axially away from the sealing ring clamping plate 11, so as to drive the sealing ring 3 welded to the reinforced composite pipe 4 to exit from the annular clamping groove 11a. An anti-sticking layer (such as a polytetrafluoroethylene coating) can be arranged on the surface of the annular clamping groove 11a, so that the sealing ring 3 can exit from the annular clamping groove 11a along with the reinforced composite pipe 4. In a preferred embodiment, the entire surface of the closure ring card 11 is provided with an anti-adhesive layer. After the sealing ring is withdrawn from the annular clamping groove 11a, redundant materials may exist at the joint position (inner and outer peripheries) of the sealing ring 3 and the reinforced composite pipe 4, and the redundant materials can be removed by using an edge trimming tool, so that the inner and outer surfaces of the joint position are flush with the inner and outer wall surfaces of the reinforced composite pipe 4.

In the present invention, the first heating device 1 may be provided in various suitable configurations to heat the end surface of the sealing ring 3 placed in the ring slot 11a of the sealing ring chucking plate 11, which end surface faces the open end of the ring slot 11a. In order to uniformly heat the end face of the sealing ring 3 and ensure the melting efficiency, in a preferred embodiment of the present invention, as shown in fig. 1 and 2, the first heating device 1 further includes a sealing ring hot press plate 13, and the sealing ring hot press plate 13 is formed with a hot press plate protruding ring 13a matching with the ring-shaped clamping groove 11a. The sealing ring hot press plate 13 may be configured to heat the sealing ring 3 disposed in the ring slot 11a through the hot press plate protruding ring 13a. As shown in the figure, a hot-pressing heating plate 14 for generating heat may be provided on the side of the sealing ring hot-pressing plate 13 facing away from the sealing ring carrier 11, or other heating elements (such as heating tubes) may be integrated in the sealing ring hot-pressing plate 13, and the generated heat can be transferred through the sealing ring hot-pressing plate 13 and applied to the end face of the sealing ring 3 through the hot-pressing plate protruding ring 13a. Thus, in the melting step, after the sealing ring 3 is placed in the ring-shaped clamping groove 11a of the sealing ring clamping plate 11, the sealing ring hot-pressing plate 13 and the sealing ring clamping plate 11 are relatively moved, so that at least part of the hot-pressing plate protruding ring 13a enters the ring-shaped clamping groove 11a and abuts against the sealing ring 3 placed in the ring-shaped clamping groove 11a, and the end face of the sealing ring 3 facing the hot-pressing plate protruding ring 13a is heated, and the end face is melted. In the preferred embodiment shown in fig. 1, the sealing ring catch plate 11 of the first heating device 1 is arranged to be movable only in a direction perpendicular to the central axis of the reinforced composite pipe 4 (along a second slide guide 51 described later) so as to switch between the melting position and the welding position, while relative movement with respect to the frame 5 in which it is located in a direction parallel to the central axis of the reinforced composite pipe 4 is not possible, whereby the sealing ring heat press plate 13 of the first heating device is arranged to be movable closer to or away from the sealing ring catch plate 11 in the melting position along a first slide guide 15, such as a guide rail or a slide bar, in a direction parallel to the central axis of the reinforced composite pipe 4 (the direction indicated by arrow a). In other embodiments, other arrangements may be used to enable the relative movement between the seal ring hot press plate 13 and the seal ring clamping plate 11, so that the hot press plate protruding ring 13a enters the ring clamping groove 11a. Here, in order to melt the end face of the sealing ring 3 in a suitable state, the temperature of the hot platen protrusion ring 13a may be maintained at 200 to 220 ℃ in the melting step, and the holding time against the sealing ring 3 may be 80 to 200 seconds.

After the melting is completed, the sealing ring hot pressing plate 13 and the sealing ring clamping plate 11 are relatively far away, so that the hot pressing plate convex ring 13a is withdrawn from the annular clamping groove 11a, and then the sealing ring clamping plate 11 is moved to a welding position coaxial with the reinforced composite pipe 4 to be sealed. Here, an anti-sticking layer (e.g., teflon coating) may be provided on the surface of the hot platen protrusion ring 13a to prevent the sealing ring 3 from being withdrawn from the ring slot 11a along with the hot platen protrusion ring 13a. In a preferred embodiment, the entire surface of the seal ring hot-press plate 13 is provided with an anti-sticking layer. In addition, chamfers may be formed at the ends of the hot platen protrusion ring 13a and the ring card slot 11a opposite to each other so that they are fittingly inserted.

In the first heating apparatus 1, the sealing ring clamping plate 11 and the sealing ring hot-pressing plate 13 may be made of a material such as aluminum or copper having a good heat conductivity. For reinforced composite pipes with different calibers or wall thicknesses, the sealing ring snap-gauge 11 and the sealing ring hot-press plate 13 with different specifications can be replaced so as to adapt to the heating and melting process of the sealing ring 3 with corresponding size.

Referring to fig. 1, 5 to 8, in the sealing method and the sealing apparatus according to a preferred embodiment of the present invention, the end surface to be sealed of the reinforced composite pipe 4 is heated by hot air to be melted. Specifically, the second heating device 2 for heating the end face to be sealed of the reinforced composite pipe 4 may include a hot air blower 21, and the hot air blower 21 may blow hot air to the end face to be sealed of the reinforced composite pipe 4 to heat so as to melt the end face to be sealed. By adopting the hot air heating mode, the heating temperature can be lower than the heating temperature of the sealing ring 3, such as 100-150 ℃, so as to avoid the excessive melting of the end face to be sealed of the reinforced composite pipe 4. The heat blower 21 is generally an industrial heat blower, and the structure and operation thereof are well known to those skilled in the art and will not be described in detail herein.

Further, in order to make the hot air blown by the hot air blower 21 uniformly applied to each portion of the end surface to be sealed of the reinforced composite pipe 4, a hot air ring 22 may be connected to an air outlet end of the hot air blower 21. During the melting process, the reinforced composite pipe 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 to guide the hot air uniformly applied to all positions in the circumferential direction of the end face to be sealed.

Specifically, fig. 5 and 6 show a schematic cross-sectional structure of the hot air ring 22 employed in a preferred embodiment of the present invention. The hot air ring 22 includes an air inlet connected to the air outlet of the air heater 21, a tapered portion extending from the air inlet, and an extension extending from the tapered portion, so as to allow the reinforced composite pipe 4 to enter the hot air ring 22. The hot air ring 22 has an inner plate 221 and an outer plate 222 which are radially spaced from each other, a hot air duct 223 is defined between the inner plate 221 and the outer plate 222, and hot air blown by the hot air blower 21 is blown onto the end surface to be sealed of the reinforced composite pipe 4 through the hot air duct 223, that is, in the melting step, the end surface to be sealed of the reinforced composite pipe 4 extends into a space between the inner plate 221 and the outer plate 222. The radial dimension of the hot air duct 223 may be set slightly larger than the wall thickness of the reinforced composite tube 4 so that the reinforced composite tube 4 is inserted therein. In addition, the hot air ring 22 of a different size may be replaced according to the specification of the reinforced composite pipe 4 to be sealed.

The heat tends to spread radially outward during the transfer of the hot air duct 223, which may result in uneven heating at different wall thickness locations of the reinforced composite tube 4. For this, a hot air guide structure may be provided in the hot air duct 223 so that heat is uniformly applied to the reinforced composite tube 4. In the preferred embodiment shown in fig. 5 and 6, a wind blocking ring 224 is provided in the hot wind duct 223, and the wind blocking ring 224 guides the hot wind to flow in a direction close to the inner plate 221 to reduce or eliminate an adverse effect caused by heat diffusion outward.

In another preferred embodiment shown in fig. 7 and 8, the hot air ring 22 may be provided with a plurality of inner ring air outlets 225 and a plurality of outer ring air outlets 226, which are respectively distributed along the circumferential direction, in the hot air duct 223, wherein the distribution density of the inner ring air outlets 225 is greater than that of the outer ring air outlets 226, so as to guide more hot air to be blown out from the portion close to the inner layer of the reinforced composite pipe 4, so that the end surface to be sealed is uniformly heated. It is understood that the inner ring air outlet 225 and the outer ring air outlet 226 are both formed as circular holes and provided in plural numbers, and in other embodiments, the inner ring air outlet 225 and the outer ring air outlet 226 may be formed in other shapes as long as the total through-flow area of the inner ring air outlet 225 is larger than that of the outer ring air outlet 226. In addition, the aforementioned wind deflector ring 224 and the wind outlet arrangement may be applied simultaneously in the same wind deflector ring 22.

In the sealing method provided by the present invention, it is necessary to heat the end surface to be sealed of the reinforced composite pipe 4 and the end surface of the sealing ring 3 for joining to the reinforced composite pipe 4 separately in the melting step and to make the sealing ring 3 coaxially contact with the reinforced composite pipe 4 in the subsequent welding step. In order to improve the sealing efficiency and avoid solidification of the molten material due to an excessively long switching time in the step switching, it is necessary to reasonably arrange the relative positions and the moving relationship of the respective portions. Here, as shown in fig. 1, the sealing ring card 11 and the second heating device 2 including, for example, the hot air blower 21 may be mounted on the same mounting plate 6, and the mounting plate 6 may be slidably mounted on the frame 5 via a second slide guide 51 such as a guide rail or a slide bar, so that the sealing ring card 11 and the second heating device 2 can be driven to slide in a direction (a direction indicated by an arrow B) perpendicular to the central axis of the reinforced composite pipe 4. When the sealing ring clamping plate 11 is slid to align the ring clamping groove 11a of the sealing ring clamping plate 11 with the hot pressing plate convex ring 13a of the sealing ring hot pressing plate 13, the hot air ring 22 connected with the hot air blower 21 is just coaxial with the reinforced composite pipe 4, so that the sealing ring 3 and the reinforced composite pipe 4 can be synchronously heated.

When the heating and melting are completed, the mounting plate 6 is slid on the frame 5, the hot air blower 21 is moved out of the position coaxial with the reinforced composite pipe 4, and the seal ring pressing plate 11 is moved so that the seal ring 3 therein is coaxial with the reinforced composite pipe 4, whereby the coaxial connection can be achieved by the relative axial movement. In the process, the mounting plate 6 can be driven to slide by a servo motor or a stepping motor so as to accurately control the moving position and speed of the mounting plate, and the sealing quality is ensured. Through the arrangement, the sealing ring 3 and the reinforced composite pipe 4 can be heated simultaneously in the sealing process, the melting step is quickly switched to the welding step, and heat loss in the switching process is reduced.

During the sealing process, the reinforced composite pipe 4 to be sealed should be properly supported so as to be coaxially connected with the sealing ring 3. In the illustrated preferred embodiment, the sealing apparatus further comprises a composite tube supporting device having a tube clamp 7 for clamping the reinforced composite tube 4, wherein the tube clamp 7 is in transmission connection with a servo motor or a stepping motor for driving the reinforced composite tube 4 to move in the axial direction (the direction indicated by the arrow C in the figure), such as can be driven so that the tube clamp 7 slides the reinforced composite tube 4 clamped by the tube clamp along a third sliding guide 8. Thus, when the sealing ring 3 is moved to a position coaxial with the composite reinforcing pipe 4, the composite reinforcing pipe 4 can be driven to move toward the sealing ring 3 and be welded integrally to the annular groove 11a of the sealing ring locking plate 11.

As shown in fig. 1, in order to further improve the production efficiency, the first heating device 1 and the second heating device 2 may be disposed at both ends of the composite pipe supporting device, so that both ends of the reinforced composite pipe 4 can be sealed in a clamped state without turning the clamping direction.

For a better understanding of the above-described sealing method and sealing device of the invention, the sealing process is illustrated below in connection with the preferred embodiments shown in the drawings:

the sealing ring hot pressing plate 13 is heated to a required temperature (200-220 ℃) through the hot pressing heating plate 14, the sealing ring 3 is placed in the annular clamping groove 11a of the sealing ring clamping plate 11, the hot pressing heating plate 14 fixed on the sealing ring hot pressing plate 13 is driven to move towards the sealing ring clamping plate 11, the hot pressing plate convex ring 13a is moved into the annular clamping groove 11a and is tightly attached to the surface of the sealing ring 3, 80-200 seconds are kept, and the end face of the sealing ring 3 is fused. Meanwhile, the reinforced composite pipe 4 is driven by the pipe clamp 7 to move into the hot air ring 22, and hot air (at the temperature of 100-150 ℃) is blown to the end face of the reinforced composite pipe 4, so that the plastic on the end face is melted.

After the end surfaces of the sealing ring 3 and the reinforced composite tube 4 are melted, the sealing ring hot-pressing plate 13 is rapidly withdrawn from the annular clamping groove 11a of the sealing ring clamping plate 11 and the reinforced composite tube 4 is withdrawn from the hot-air ring 22 respectively under the condition that the end surfaces of the sealing ring 3 and the reinforced composite tube 4 are kept in a molten state, and the sealing ring clamping plate 11 (with the sealing ring 3) is translated to a position coaxial with the reinforced composite tube 4.

The reinforced composite pipe 4 is driven by the pipe clamp 7 to move into an annular clamping groove 11a of the sealing ring clamping plate 11, and the end surface to be sealed is molten, contacts the sealing ring 3 with the end surface in a molten state, and maintains the pressure for 60s-200s (the pressure for maintaining 0.1MPa-1 MPa). After cooling for a while, the reinforced composite pipe 4 is withdrawn, and at this time, the sealing ring 3 and the reinforced composite pipe 4 are welded together and are released from the annular clamping groove 11a.

Finally, excess material is removed at the location where the sealing ring 3 and the reinforced composite pipe 4 meet using an edging tool.

The sealing process can complete the sealing of one end in 6 minutes.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims (22)

1. A sealing method of a reinforced composite pipe is characterized by comprising the following steps:

s1, heating a sealing ring (3) by using a first heating device (1) to melt the end face of the sealing ring (3) for jointing to the reinforced composite pipe (4); heating the end face to be sealed of the reinforced composite pipe (4) by using a second heating device (2) to melt the end face to be sealed;

s2, moving at least one of the sealing ring (3) and the reinforced composite pipe (4) to enable the fused end face of the sealing ring (3) to be coaxially connected with the end face to be sealed of the reinforced composite pipe (4), and keeping for a preset time under a preset axial pressure.

2. A method of sealing a reinforced composite pipe according to claim 1, wherein the first heating means (1) comprises a sealing ring clamping plate (11) formed with a ring clamping groove (11 a), and in step S1, the sealing ring (3) is placed in the ring clamping groove (11 a) and heated in the ring clamping groove (11 a) so that an end surface of the sealing ring (3) facing an open end of the ring clamping groove (11 a) is melted.

3. Sealing method of reinforced composite pipe according to claim 2, characterized in that the side of the sealing ring snap gauge (11) facing away from the open end of the ring groove (11 a) is provided with an insulating and heating plate (12), and in step S1 and/or S2, the insulating and heating plate (12) transfers heat through the sealing ring snap gauge (11) to the sealing ring (3) placed in the ring groove (11 a).

4. The method for sealing a reinforced composite pipe according to claim 2, wherein the first heating device (1) further comprises a sealing ring hot press plate (13), the sealing ring hot press plate (13) is formed with a hot press plate protruding ring (13 a) matched with the annular clamping groove (11 a), and in step S1, the sealing ring hot press plate (13) and the sealing ring clamping plate (11) are relatively moved so that at least a part of the hot press plate protruding ring (13 a) enters the annular clamping groove (11 a) and abuts against the sealing ring (3) placed in the annular clamping groove (11 a) to heat and melt an end face of the sealing ring (3) facing the hot press plate protruding ring (13 a) through the hot press plate protruding ring (13 a).

5. The method of sealing a reinforced composite pipe according to claim 4, wherein in step S1, the temperature of the hot platen bulge loop (13 a) is 200-220 ℃, and/or the holding time of the hot platen bulge loop (13 a) against the sealing ring (3) is 80-200S.

6. The method for sealing a reinforced composite pipe according to claim 4, wherein an anti-sticking layer is provided on the surface of the hot platen protruding ring (13 a) and/or the ring-shaped clamping groove (11 a).

7. The method of sealing a reinforced composite pipe as claimed in claim 2, wherein at least one of the sealing ring (3) and the reinforced composite pipe (4) is moved in step S2 so that the end face to be sealed of the reinforced composite pipe (4) enters the annular groove (11 a) to coaxially meet the melted end face of the sealing ring (3).

8. A method of sealing reinforced composite pipes according to claim 2, wherein the second heating means (2) and the sealing ring engaging plate (11) are mounted on the same mounting plate (6), the mounting plate (6) being slidably disposed on a frame (5), and in step S2, the sealing ring (3) disposed in the ring engaging groove (11 a) is made coaxial with the reinforced composite pipe (4) by sliding the mounting plate (6) on the frame (5) in a direction perpendicular to the axial direction of the reinforced composite pipe (4).

9. The method for sealing a reinforced composite pipe according to claim 1, wherein the second heating device (2) comprises a hot air blower (21), and in step S1, hot air is blown by the hot air blower (21) to the end surface to be sealed of the reinforced composite pipe (4) to heat the end surface to be sealed so as to melt the end surface.

10. The method for capping the reinforced composite pipe according to claim 9, wherein the end face to be capped of the reinforced composite pipe (4) is heated to have a temperature of 100 ℃ to 150 ℃ in step S1.

11. The method for sealing a reinforced composite pipe according to claim 9, wherein the second heating device (2) comprises a hot air ring (22) disposed at an air outlet end of the air heater (21), and at least one of the reinforced composite pipe (4) and the air heater (21) is moved in step S1 so that the end surface to be sealed of the reinforced composite pipe (4) enters the hot air ring (22).

12. The sealing method of the reinforced composite pipe according to claim 11, wherein the hot air ring (22) has an inner plate (221) and an outer plate (222) which are radially spaced 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 surface to be sealed of the reinforced composite pipe (4) enters the hot air duct (223), wherein a wind blocking ring (224) for guiding the flow of hot air is arranged in the hot air duct (223), and/or the hot air duct (223) has an inner ring air outlet (225) and an outer ring air outlet (226) which are respectively distributed along the circumferential direction, and the total flow area of the inner ring air outlet (225) is larger than that of the outer ring air outlet (226).

13. The method of claim 1, wherein in step S2, the predetermined axial pressure is 0.1MPa to 1MPa, and the predetermined time is 60S to 200S.

14. The method of claim 1, wherein at least one of the sealing ring (3) and the reinforced composite tube (4) is driven to move by a servo motor or a stepping motor in step S2.

15. The method of sealing a reinforced composite pipe as claimed in claim 1, further comprising a step S3 performed after the step S2 of: and removing redundant materials at the joint position of the sealing ring (3) and the reinforced composite pipe (4) by using an edge trimming tool.

16. The utility model provides a compound sealing equipment of pipe of reinforcing, characterized in that, including being used for heating the first heating device (1) of sealing ring (3) and being used for heating the second heating device (2) of waiting to seal the terminal surface of compound pipe (4) of reinforcing, first heating device (1) including be formed with ring card groove (11 a) seal ring cardboard (11) and be formed with ring card groove (11 a) match hot pressboard bulge loop (13 a) seal ring hot pressboard (13), seal ring hot pressboard (13) with seal ring cardboard (11) can relative motion for making at least part hot pressboard bulge loop (13 a) get into in ring card groove (11 a) and lean on and place in ring card groove (11 a) seal ring (3) to through this hot pressboard bulge loop (13 a) the orientation of this sealing ring (3) the terminal surface of hot pressboard bulge loop (13 a) to make this terminal surface melting.

17. The sealing device for the reinforced composite pipe according to claim 16, wherein an anti-sticking layer is provided on the surface of the hot platen protruding ring (13 a) and/or the ring-shaped clamping groove (11 a).

18. Sealing device for reinforced composite pipes according to claim 16, characterized in that it comprises a mounting plate (6) slidably arranged on a frame (5), on which mounting plate (6) the second heating means (3) and the sealing ring catch plate (22) are mounted, so that the sealing ring (3) placed in the annular catch groove (11 a) can be made coaxial with the reinforced composite pipe (4) by sliding the mounting plate (6) on the frame (5) in a direction perpendicular to the axial direction of the reinforced composite pipe (4).

19. Sealing equipment for reinforced composite pipes according to claim 16, wherein the second heating device (2) comprises a hot air blower (21) and a hot air ring (22) arranged at the air outlet end of the hot air blower (21), and is configured to allow the end surface to be sealed of the reinforced composite pipe (4) to enter the hot air ring (22) so as to melt the end surface to be sealed by blowing hot air from the hot air blower (21) to the end surface to be sealed of the reinforced composite pipe (4).

20. Sealing device for reinforced composite pipes according to claim 19, characterized in that the hot air ring (22) has an inner plate (221) and an outer plate (222) arranged radially at a distance from each other to define a hot air duct (223) between the inner plate (221) and the outer plate (222) capable of accommodating the end face to be sealed of the reinforced composite pipe (4), wherein a wind blocking ring (224) for guiding the flow of hot air is arranged in the hot air duct (223), and/or the hot air duct (223) has an inner ring wind outlet (225) and an outer ring wind outlet (226) distributed circumferentially respectively, and the total flow area of the inner ring wind outlet (225) is larger than the total flow area of the outer ring wind outlet (226).

21. Sealing device for reinforced composite pipes according to claim 16, characterized in that it comprises a composite pipe support device with a pipe clamp (7) for clamping the reinforced composite pipe (4), the pipe clamp (7) being drivingly connected with a servo motor or stepper motor for driving the reinforced composite pipe (4) in axial movement.

22. The apparatus for sealing a reinforced composite pipe according to claim 21, wherein the first heating means (1) and the second heating means (2) are provided at both ends of the composite pipe supporting means to respectively seal both ends of the reinforced composite pipe (4) in a state where the reinforced composite pipe (4) is clamped.

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