A glue injection system and a glue injection method thereof

Abstract

The application discloses a glue injection system and a glue injection method thereof, and belongs to the technical field of pipeline repair. The system comprises a glue injection joint, a pretreatment device, a sealing device, a water injection device, a blowing device and a glue injection device. The glue injection joint is designed in a special structure of a thin-wall sleeve, which is thick at both ends and thin in the middle, forms a glue cavity space, and is symmetrically provided with a plurality of glue injection holes. The pretreatment device reduces installation resistance through mechanical expansion and lubrication treatment; the sealing device realizes the closure of the glue injection holes; the water injection device uniformly deforms the thin-wall sleeve; the blowing device ensures that the glue cavity is clean and dry; and the glue injection device realizes synchronous glue injection of the multiple holes. The method comprises the steps of inserting a hose, closing the glue injection holes, high-pressure water pre-deformation, drainage treatment and sealant injection. The application solves the technical problems of uneven sealing and incomplete filling of the traditional glue injection joint, has the advantages of good sealing performance, high construction efficiency, long service life and the like, and is particularly suitable for the repair engineering of high-pressure pipelines such as oil pipelines and heat pipelines.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pipeline repair and sealing, mainly applied to the repair engineering of oil pipelines, heat pipelines and other medium-high pressure pipelines, and relates to a glue injection system and a glue injection method thereof. The thin-wall sleeve of the glue injection joint of the glue injection system is pre-deformed and porous synchronous glue injection is performed, uniform deformation of the thin-wall sleeve is achieved, the sealing effect and service life of the joint are improved, and the glue injection system is suitable for large-scale pipeline repair engineering. BACKGROUND

[0002] In the field of pipeline repair and connection, glue injection joints as a common sealing structure are widely used in the repair engineering of oil pipelines, heat pipelines and other medium-high pressure pipelines. Traditional glue injection joints are usually composed of an outer sleeve, an inner core and sealing glue, and the sealing of the pipeline connection is achieved by injecting sealing glue into the joint. However, the existing technology has many deficiencies in actual application. First, during the glue injection process of the traditional glue injection joint, due to the solid state characteristics of the sealing glue, its flowability is poor, resulting in uneven pressure distribution in the glue cavity. This uneven pressure distribution causes the thin-wall sleeve to be unbalanced, forming a wavy deformation, which in turn causes gaps between the hose and the thin-wall sleeve, seriously affecting the sealing performance of the joint. Second, the existing glue injection process usually uses a single-hole glue injection method, and the filling effect of the sealing glue in the glue cavity is poor, which is prone to air holes or incomplete filling, reducing the long-term sealing reliability of the joint. In addition, the installation process of the traditional glue injection joint is complex, the friction resistance is large when the hose is inserted, which easily causes damage to the surface of the hose, affecting the sealing effect. These problems seriously restrict the application effect of the glue injection joint in high-pressure pipeline repair.

[0003] The limitations of the existing glue injection joint technology mainly lie in the following aspects: first, the deformation control problem of the thin-wall sleeve. Since the traditional process directly injects solid sealing glue, the glue flowability is poor, which causes the thin-wall sleeve to deform unevenly when under pressure, easily forming local stress concentration, and then producing a wavy gap. This gap not only reduces the sealing performance, but also gradually expands due to pressure fluctuations in long-term use, eventually leading to joint failure. Second, the poor filling effect of the sealing glue. The traditional single-hole glue injection method cannot ensure the uniform distribution of the sealing glue in the glue cavity, which is prone to gas accumulation or incomplete filling areas at the end, affecting the overall sealing of the joint. Third, the installation process is complex and inefficient. The high friction resistance when inserting the hose not only increases the installation difficulty, but also may cause scratches on the surface of the hose, affecting its service life. In addition, the existing technology lacks effective glue cavity cleaning means, and residual moisture or impurities will affect the bonding strength of the sealing glue, further reducing the reliability of the joint. These problems make it difficult for the traditional glue injection joint to meet the long-term sealing needs of high-pressure pipelines, and a new technical solution is urgently needed to solve these defects.

[0004] In view of the deficiencies of the existing glue injection system technology, an innovative solution is needed to improve the sealing performance and reliability of the joint. First, the deformation mode of the thin-walled sleeve needs to be improved to ensure uniform stress and avoid the formation of wavy gaps. Second, the filling process of the sealing glue needs to be optimized to ensure that there are no pores and cavities in the glue cavity, improving the uniformity and long-term stability of the seal. In addition, the installation process should be simplified to reduce the friction resistance of the inserted hose and improve the construction efficiency. At the same time, effective glue cavity cleaning technology should be introduced to ensure the bonding strength of the sealing glue and the metal surface. These improvements not only improve the sealing performance of the joint, but also extend its service life and reduce maintenance costs. Therefore, the development of a new type of glue injection system and its injection method has important engineering value and market significance, and can provide more reliable technical support for the repair and maintenance of high-pressure pipelines. SUMMARY

[0005] (I) Invention purposes

[0006] In view of the defects and deficiencies of the existing technology, to solve at least one of the above and other technical problems in the prior art, the present application aims to provide a glue injection system and its injection method, which realizes the significant improvement of the joint sealing performance and the simplification of the installation process through innovative structural design and optimized glue injection process. Specifically, the present application solves the technical problems of uneven deformation of the thin-walled sleeve, incomplete filling of the sealing glue and high installation resistance caused by poor flowability of the traditional glue injection joint, ensures uniform wrapping of the hose by high-pressure water pre-deformation process, realizes complete filling of the sealing glue by multi-hole synchronous glue injection technology, and reduces the installation resistance by pre-expansion treatment and lubricant application, providing a more reliable and efficient solution for the repair and maintenance of high-pressure pipelines.

[0007] (II) Technical solutions

[0008] To achieve the purpose of the application and solve its technical problems, the present application adopts the following technical solutions:

[0009] The first purpose of the present application is to provide a glue injection system, comprising:

[0010] The glue injection joint comprises a glue injection joint inner core and a glue injection joint outer sleeve, the glue injection joint outer sleeve is sleeved on the outside of the glue injection joint inner core, a thin-walled sleeve is arranged inside the glue injection joint outer sleeve, the middle part of the thin-walled sleeve has a smaller thickness than the two side end parts, the two side end parts are fixed to the inner wall of the glue injection joint outer sleeve, a glue cavity is formed between the middle part of the thin-walled sleeve and the inside of the glue injection joint outer sleeve, a plurality of glue injection holes are arranged on the glue injection joint outer sleeve in a symmetrical distribution and are in communication with the glue cavity, the number of glue injection holes is more than four, and an inserted hose is arranged between the thin-walled sleeve and the glue injection joint inner core.

[0011] The pre-treatment device comprises a mechanical expansion device for pre-expanding the thin-wall sleeve, a coating device for coating lubricant on the outer surface of the penetrating hose, and a lubricant.

[0012] The sealing device comprises a detachable sealing plug arranged at the glue injection hole for closing the glue injection hole.

[0013] The water injection device comprises a plunger pump connected to the glue injection hole in operation to inject high-pressure water into the glue cavity.

[0014] The purging device comprises a compressed air system connected to the glue injection hole in operation to introduce compressed air into the glue cavity through the glue injection hole.

[0015] The glue injection device comprises a multi-head glue injection gun and sealing glue, and is connected to the glue injection hole in operation to inject the sealing glue into the glue cavity through the plurality of glue injection holes.

[0016] The second object of the present application is to provide a glue injection method based on the above-mentioned glue injection system.

[0017] Step S1, the penetrating hose is inserted between the inner core of the glue joint and the thin-wall sleeve.

[0018] Step S2, one glue injection hole is kept open, and the remaining glue injection holes are closed.

[0019] Step S3, water is injected into the glue cavity, and the thin-wall sleeve is uniformly deformed and tightly wrapped around the penetrating hose under the action of water pressure.

[0020] Step S4, after maintaining the water pressure for a predetermined time, the closed glue injection hole is opened to discharge the water in the glue cavity.

[0021] Step S5, the sealing glue is injected into the glue cavity through the plurality of glue injection holes until the glue cavity is filled.

[0022] (Three) Technical effects

[0023] Compared with the prior art, the glue injection system and the glue injection method have the following beneficial and significant technical effects:

[0024] The structural design and process cooperation of the system realize the improvement of the sealing performance. The thin-wall sleeve is thin in the middle and thick at both ends, and is pre-deformed by high-pressure water injection, so that the thin-wall sleeve can be uniformly deformed and tightly wrapped around the penetrating hose, solving the problem of wavy deformation. The plurality of symmetrically distributed glue injection holes ensure uniform filling of the sealing glue and eliminate the air hole and cavity phenomenon. The structure of the system enables the joint to maintain excellent sealing performance under high-pressure working conditions, prolonging the service life.

[0025] (2) The system pre-treatment and auxiliary device improves the construction efficiency and quality stability. The mechanical expansion and lubrication treatment reduces the insertion resistance and protects the integrity of the hose surface. The sealable device realizes the rapid closure of the glue injection hole. The pressure control of the water injection device and the blowing device ensures the uniformity of the thin-walled sleeve deformation and the thoroughness of the glue cavity cleaning. The whole system makes the glue injection process more efficient and reliable, reduces the difficulty of manual operation and the quality fluctuation of the project.

[0026] (3) The process flow and intelligent control of the glue injection method realize quality control. From pre-treatment, insertion installation to water injection deformation, blowing cleaning, and finally to glue injection and curing, each link has clear process parameters and quality control points. The combination of multi-hole synchronous glue injection and dynamic exhaust ensures the complete filling of the sealant. The whole process flow cooperates with each other, improves the construction efficiency, ensures the quality consistency of the joint, and provides protection for the safe operation of the high-pressure pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a sectional view of the glue injection joint of the embodiment of the present application;

[0029] Figure 2 is a sectional view of the glue injection joint of the embodiment of the present application when the thin-walled sleeve is uniformly stressed;

[0030] Figure 3 is a sectional view of the glue injection joint of the embodiment of the present application when the thin-walled sleeve is not uniformly stressed;

[0031] Figure 4 is an enlarged view of A in the sectional view of the thin-walled sleeve when the thin-walled sleeve is not uniformly stressed;

[0032] Figure 5 is a glue injection method flow chart of the glue injection joint of the embodiment of the present application.

[0033] Explanation of reference numerals: 1 - inner core of the glue joint; 2 - outer sleeve of the glue joint; 3 - thin-walled sleeve; 4 - glue injection hole; 5 - glue cavity; 6 - inserted hose; 7 - wave-shaped gap hole. DETAILED DESCRIPTION

[0034] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0035] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution of this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0036] Example 1

[0037] As a specific example, such as Figures 1 to 4 As shown, the glue injection system mainly includes a glue injection connector, a pretreatment device, a sealing device, a water injection device, a purging device, and a glue injection device. The glue injection connector mainly includes components such as a glue-pressing connector inner core 1, a glue-pressing connector outer sleeve 2, a thin-walled sleeve 3, a glue cavity 5, a glue injection hole 4, and an insert hose 6. The glue-pressing connector inner core 1 is located inside the glue-pressing connector outer sleeve 2, serving as a support component. Its outer surface is in close contact with the inner wall of the insert hose 6, providing structural support for the entire connector. The middle part of the thin-walled sleeve 3 and the inside of the glue-pressing connector outer sleeve 2 form the glue cavity 5, the size of which changes with the deformation of the thin-walled sleeve 3. The glue injection hole 4 is located on the glue-pressing connector outer sleeve 2 and communicates with the glue cavity 5, serving as a channel for fluid injection and discharge. The insert hose 6 is installed in the annular space between the thin-walled sleeve 3 and the glue-pressing connector inner core 1. Its outer surface is in contact with the thin-walled sleeve 3, while its inner surface is in close contact with the glue-pressing connector inner core 1. The thickness of the middle section of the thin-walled sleeve 3 is less than that of the two end sections, making it easier for the middle section to undergo uniform radial deformation under pressure. The two end sections of the thin-walled sleeve 3 are fixed to the inner wall of the pressure-fitting connector outer sleeve 2, ensuring that there is no relative displacement between the thin-walled sleeve 3 and the pressure-fitting connector outer sleeve 2 when water or sealant is injected into the glue cavity 5. The pressure-fitting connector outer sleeve 2 is provided with multiple injection holes 4, which solves the problem of poor sealant flowability and allows the sealant to fill the glue cavity 5. There are more than four injection holes 4, and the multiple injection holes 4 are evenly and symmetrically distributed along the circumference, ensuring that the pressure can be evenly transmitted during injection and that the sealant is evenly distributed in the glue cavity 5.

[0038] In some preferred embodiments, the thin-walled sleeve 3 inside the pressure-fit connector outer sleeve 2 is made of low-carbon steel. Specifically, the thin-walled sleeve 3 can be made of Q235 low-carbon steel, which has excellent elasticity and strength. The two ends of the thin-walled sleeve 3 can be firmly fixed to the inner wall of the pressure-fit connector outer sleeve 2 by welding, ensuring that it will not shift or loosen under high pressure. The insertion hose 6 can be made of PU / PE / PVC material, which has good flexibility and sealing performance.

[0039] In some preferred embodiments, the inner core 1 of the glue joint is coaxially arranged inside the outer sleeve 2 of the glue joint, and an annular space is formed between the two for accommodating the thin-walled sleeve 3 and the inserted hose 6. In the natural state, the gap between the thin-walled sleeve 3 and the inserted hose 6 is a wavy gap hole 7, which provides the necessary space for subsequent sealing deformation.

[0040] The glue joint of the present application achieves significant performance improvement through unique structural design. The thin-walled sleeve 3 adopts a gradual thickness design with thin middle and thick ends, which can deform uniformly inward first when high-pressure water injection occurs, perfectly wrapping the inserted hose 6, while the thick-walled ends on both sides provide rigid support to prevent irregular distortion. The design of multiple symmetrically distributed glue injection holes 4 achieves multi-directional synchronous glue injection, ensuring uniform filling of the sealing glue in the glue cavity 5, completely solving the air hole and incomplete filling problems caused by traditional single-hole glue injection. The cooperation structure between the inserted hose 6, the thin-walled sleeve 3 and the glue joint inner core 1 forms a multi-layer sealing system, greatly improving the pressure-bearing capacity and sealing reliability of the joint. The material selection of Q235 low-carbon steel thin-walled sleeve 3 ensures both plastic deformation capability and structural strength, enabling the joint to withstand long-term high-pressure working conditions. The overall structural design is compact and reasonable, and the interaction between the components constitutes a high-efficiency and reliable sealing system, making the glue joint significantly superior to traditional products in terms of sealing performance, pressure resistance and service life.

[0041] The pretreatment device includes a mechanical expansion device, a coating device and a lubricant. The mechanical expansion device can uniformly pre-expand the thin-walled sleeve 3, temporarily increasing its inner diameter and effectively reducing the subsequent insertion resistance of the inserted hose. The coating device can form a uniform and continuous lubricating film on the outer surface of the inserted hose 6 through a spraying system, further reducing the frictional resistance during insertion. The lubricant has good lubricating performance and chemical stability, ensuring smooth operation of the insertion process without affecting the bonding effect of the subsequent sealing glue. The pretreatment device coordinates the expansion and coating processes through an intelligent control system, ensuring the consistency and reliability of the treatment effect. After pretreatment, the installation resistance of the inserted hose is significantly reduced, making the installation process smoother and protecting the integrity of the hose surface, while creating ideal conditions for subsequent water injection deformation and glue injection sealing processes. The entire pretreatment process is simple and efficient, significantly improving the assembly quality and construction efficiency of the joint.

[0042] The sealing device includes a removable sealing plug located at the injection hole 4, achieving a reliable sealing effect. The removable sealing plug body is made of high-pressure resistant elastic material, and its outer surface features a progressive sealing flange that forms a multi-layered sealing fit with the inner wall of the injection hole 4. The removable sealing plug offers multiple fixing methods, including threaded connection, interference fit, and quick-release. The threaded connection uses a standard threaded interface, achieving a reliable locking seal through rotation; the interference fit utilizes the compression deformation characteristics of the elastic material, forming a tight fit through pressing. This sealing device offers advantages such as easy installation, reliable sealing, and reusability, improving the operational efficiency and reliability of the injection process.

[0043] The water injection device includes a plunger pump, which connects to the injection port 4 via a quick-connect interface to form a high-pressure water injection channel. The plunger pump is equipped with a pressure control unit, capable of generating a stable high-pressure water flow, which is then uniformly injected into the glue cavity 5 through the injection port 4. The water injection device also includes intelligent control technology, which monitors the water injection pressure and flow parameters in real time to ensure that the water pressure acts uniformly on the entire inner surface of the thin-walled sleeve 3. The high-pressure water creates a uniform pressure distribution within the glue cavity 5, causing the thin-walled sleeve 3 to undergo controllable plastic deformation, tightly wrapping the insert hose 6. This water injection device, through precise pressure control and uniform water flow distribution, achieves uniform deformation of the thin-walled sleeve 3, laying a solid foundation for subsequent glue injection processes.

[0044] The purging device employs a high-efficiency compressed air system, which connects to the injection port 4 via a quick connector during operation, forming a purging channel. The compressed air system generates a stable airflow, introducing dry and clean compressed air into the glue cavity 5 through the injection port 4. The system utilizes a multi-stage filtration system to ensure that the air entering the glue cavity 5 is free of oil, water, and impurities, preventing contamination of the sealing surface. During purging, the compressed air creates a turbulent effect within the glue cavity 5, effectively removing residual moisture and fine particles. The device is equipped with a pressure regulating unit to control the purging air pressure, ensuring cleaning effectiveness without damaging the pre-deformed structure of the thin-walled sleeve 3. Through efficient airflow design and precise pressure control, this purging device achieves comprehensive cleaning of the glue cavity 5, providing a dry and clean sealing environment for subsequent glue injection processes, significantly improving the bonding strength of the sealant and the long-term sealing reliability of the joint.

[0045] Example 2

[0046] As a specific example, such as Figure 5 As shown, based on the dispensing system technical solution provided in Embodiment 1 above, Embodiment 2 provides a dispensing method corresponding to the above dispensing system, which mainly includes the following steps in its implementation:

[0047] Step S1: Insert the flexible tube 6 between the inner core 1 of the pressure-fit connector and the thin-walled sleeve 3;

[0048] Step S2, one of the glue injection holes 4 is kept, and the rest of the glue injection holes 4 are closed;

[0049] Step S3, water is injected into the glue cavity 5 through the plunger pump via the glue injection hole 4, so that the water fills the glue cavity 5 under high pressure, and the thin-walled sleeve 3 is uniformly deformed under the action of water pressure and tightly wraps the inserted hose 6;

[0050] Step S4, after maintaining the water pressure for a predetermined time, the closed glue injection hole 4 is opened to discharge the water in the glue cavity 5;

[0051] Step S5, sealant is injected into the glue cavity 5 through a plurality of glue injection holes 4 until the glue cavity 5 is filled.

[0052] In some preferred embodiments, the two side ends of the thin-walled sleeve 3 are fixed to the inner wall of the glue joint outer sleeve 2 by welding, so that the glue cavity 5 with a ring-shaped cross section is formed between the glue joint outer sleeve 2 and the thin-walled sleeve 3, and a uniform annular gap is formed between the thin-walled sleeve 3 and the glue joint inner core 1. Before the inserted hose 6 is formally inserted, the thin-walled sleeve 3 is pre-expanded by a mechanical expansion device, and the inner diameter of the thin-walled sleeve 3 is uniformly increased by 0.5-1.5 mm by hydraulic or mechanical means, so as to reduce the frictional resistance in the subsequent insertion process. After pre-expansion is completed, a special lubricant is uniformly coated on the outer surface of the inserted hose 6, and the lubricant can be made of a silicon-based composite material and has excellent lubricating performance and temperature stability. During the insertion operation, the end of the inserted hose 6 is first processed into a tapered lead-in structure, and then the inserted hose 6 is aligned with the inlet of the annular gap and pushed axially. When the inserted hose 6 completely passes through the annular gap, the pre-expansion force is removed to restore the thin-walled sleeve 3 to near the original size, at which time the inserted hose 6 is uniformly wrapped between the thin-walled sleeve 3 and the glue joint inner core 1, forming a tight fit. The insertion method reduces the insertion resistance through the synergistic effect of pre-expansion, lubrication treatment and tapered lead-in structure, protects the surface integrity of the inserted hose 6, and at the same time ensures the uniform distribution of the inserted hose 6 in the annular gap, laying a good foundation for the subsequent water injection deformation and sealant injection sealing processes.

[0053] In some preferred embodiments, before the water injection process is implemented, the glue injection joint needs to be subjected to glue injection hole closing treatment, and the specific operation is as follows: first, one of the glue injection holes 4 located at the geometric center of the joint is selected as the water inlet, and the rest of the glue injection holes 4 are closed by detachable sealing plugs. The sealing plug can be fixed in the glue injection hole 4 by thread connection or interference fit according to actual needs. The thread connection type sealing plug is provided with a standard threaded interface and can realize reliable sealing by rotating. The interference fit type sealing plug can be made of an elastic material, and its outer diameter is slightly larger than the inner diameter of the glue injection hole 4, and it realizes tight fit by pressing in. The surface of the sealing plug is provided with a progressive sealing ring, which can automatically enhance the sealing effect when under pressure.

[0054] In some preferred embodiments, when the high-pressure water injection process is implemented, the glue injection hole 4 of the assembled glue joint is first connected with the plunger pump to establish a stable high-pressure water injection channel. After starting the plunger pump, the plunger pump injects high-pressure water into the glue cavity 5 through the reserved glue injection hole 4 at a constant pressure of 10 MPa, and the injection rate is adjusted by the flow control system to be within the optimal range of 0.5-5 L / min, ensuring that the water flow can uniformly fill the entire glue cavity 5 space. During this process, the high-pressure water forms a uniform pressure field in the glue cavity 5 through the flow channel, promoting the controlled plastic deformation of the thin-walled sleeve 3 under the action of water pressure. The system maintains a high pressure of 10 MPa for 5 minutes, allowing the thin-walled sleeve 3 to deform fully and tightly wrap the inserted hose 6, forming a uniform contact pressure distribution. Throughout the deformation process, the pressure sensor installed at the glue injection hole 4 monitors the system pressure changes in real time, and the pressure data is fed back to the control system for dynamic adjustment, ensuring that the deformation process of the thin-walled sleeve 3 is uniform and stable, and there is no local insufficient deformation or excessive deformation. After completing the pressure maintaining process, the thin-walled sleeve 3 will remain in a stable deformed state, preparing for the subsequent glue injection process. This high-pressure water injection process precisely controls key parameters such as injection pressure, flow rate, and pressure maintaining time, ensuring the uniformity and reliability of the thin-walled sleeve 3 deformation, thereby improving the sealing performance and service life of the joint.

[0055] In some preferred embodiments, after completing the high-pressure water injection and pressure maintaining process, the system enters the water drainage phase, and the specific implementation process is as follows: First, gradually reduce the output pressure of the plunger pump through the control system to avoid sudden pressure drop causing the thin-walled sleeve 3 to rebound and deform. When the system pressure drops below 1 MPa, open the previously closed glue injection holes 4 in the predetermined order one by one, and use the residual pressure in the glue cavity 5 to simultaneously drain water from multiple glue injection holes 4, ensuring complete drainage. During the drainage process, connect the compressed air system through the main glue injection hole 4 to perform comprehensive purging of the glue cavity 5, and the compressed air forms a turbulent flow in the glue cavity 5, effectively removing residual water droplets and impurities. To completely drain the residual water in the glue cavity 5, tilt the glue joint at an angle of 15-30 degrees, allowing the residual water to collect at the lowest position of the glue injection hole 4 under the action of gravity and be drained out. This drainage process ensures the dryness and cleanliness of the glue cavity 5 through multi-stage and multi-angle drainage measures, effectively avoiding problems such as reduced adhesive bonding strength caused by residual water.

[0056] In some preferred embodiments, after the drainage and drying process of the glue cavity 5 is completed, the glue injection process is started, and the specific operation steps are as follows: first, according to the structural characteristics of the glue joint, at least four symmetrically distributed glue injection holes 4 are selected as glue injection channels, and the remaining glue injection holes 4 are used as exhaust channels. The glue injection equipment adopts a multi-head glue injection gun system, which can simultaneously perform glue injection operations on multiple glue injection holes 4, and the glue injection pressure is adjusted within an optimized range of 0.5-3MPa. During the glue injection process, the operator needs to observe the glue injection situation of each exhaust hole 4 in real time, and when it is found that there is continuous glue flow from a certain exhaust hole 4, the sealing device is immediately used to close the exhaust hole 4. In order to ensure uniform filling of the glue cavity 5 with the sealant, the glue injection sequence is performed in a diagonal alternating manner, that is, the glue injection holes 4 on one set of diagonals are first injected, and then the glue injection holes 4 on the other set of diagonals are switched to, and this is alternated. When all the exhaust holes 4 have sealant flowing out and are closed, the system maintains the glue injection pressure for 1-2 minutes to ensure that the glue cavity 5 is completely filled with sealant in all corners and eliminates any possible air bubbles or voids. After the glue injection is completed, all the glue injection holes 4 are immediately closed to prevent backflow of the sealant due to pressure release. Finally, the glue joint is visually inspected to ensure that each glue injection hole 4 is securely closed and there is no sealant overflow. The glue injection process ensures uniform distribution and complete filling of the sealant in the glue cavity 5 through measures such as multi-hole synchronous glue injection, orderly exhaust, and pressure maintenance, thereby achieving reliable sealing of the joint and long-term stable operation.

[0057] The glue injection method provided by the present application realizes the optimized manufacturing of the joint through a systematic process. The high-pressure water pre-deformation process utilizes the high flowability of water to cause the thin-walled sleeve to produce ideal plastic deformation under uniform water pressure, thereby fundamentally solving the uneven deformation problem caused by traditional direct glue injection. The multi-hole synchronous glue injection and dynamic exhaust ensure complete filling of the sealant and eliminate air holes and cavities. The pre-expansion treatment of the inserted hose and the application of lubricant significantly reduce the installation resistance and protect the surface integrity of the hose. The compressed air blowing process thoroughly cleans the inside of the glue cavity, providing an ideal bonding interface for the sealant. Compared with traditional processes, the glue injection method improves the sealing performance of the joint, prolongs the maintenance cycle and service life of the joint.

[0058] In summary, the present application improves the performance indicators of the glue joint through innovative structural design and advanced process methods, and provides a reliable technical solution for the repair and maintenance of high-pressure pipelines. The technology has excellent sealing performance, high construction efficiency, and wide application range, and has significant technical advantages and broad application prospects in the repair of oil pipelines, heat pipelines and other high-pressure pipeline networks.

[0059] The above describes the preferred embodiments of the present application. It should be understood that the present application is not limited to the specific embodiments described above, nor is it limited to the glue injection system and the glue injection method thereof. The devices and structures not described in detail should be understood as being implemented in the ordinary way in the art. Any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application or modify equivalent embodiments with equivalent changes without departing from the scope of the technical solutions of the present application, which does not affect the essential content of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the content of the technical solutions of the present application still belongs to the scope of protection of the technical solutions of the present application.

Claims

1. A glue injection system, characterized by, The application relates to a glue injection joint. The glue injection joint comprises a glue injection joint inner core and a glue injection joint outer sleeve, the glue injection joint outer sleeve is sleeved outside the glue injection joint inner core, a thin-wall sleeve is arranged inside the glue injection joint outer sleeve, the thickness of the middle part of the thin-wall sleeve is smaller than the thickness of the two side ends, the two side ends are fixed to the inner wall of the glue injection joint outer sleeve, a glue cavity is formed between the middle part of the thin-wall sleeve and the inside of the glue injection joint outer sleeve, a plurality of glue injection holes are symmetrically arranged on the glue injection joint outer sleeve and are communicated with the glue cavity, the number of the glue injection holes is more than four, and a penetrating hose is arranged between the thin-wall sleeve and the glue injection joint inner core. The pretreatment device comprises a mechanical expansion device, a coating device and a lubricant, the mechanical expansion device is used for pre-expanding the thin-wall sleeve, the coating device is used for coating the lubricant on the outer surface of the penetrating hose, and the lubricant is used for lubricating the penetrating hose. The sealing device comprises a detachable sealing plug and is arranged at the glue injection hole and used for sealing the glue injection hole. The water injection device comprises a plunger pump and is connected with the glue injection hole in working condition and injects high-pressure water into the glue cavity through the glue injection hole. The blowing device comprises a compressed air system and is connected with the glue injection hole in working condition and blows compressed air into the glue cavity through the glue injection hole. The glue injection device comprises a multi-head glue injection gun and sealing glue and is connected with the glue injection hole in working condition and injects the sealing glue into the glue cavity through the plurality of glue injection holes.

2. The injection system of claim 1, wherein The material of the thin-wall sleeve is Q235 low-carbon steel, and the two side ends of the thin-wall sleeve are welded to the inner wall of the glue injection joint outer sleeve.

3. A method of injecting glue according to any one of claims 1-2, characterized in that, The application further discloses a glue injection method. In step S1, the outer surface of the penetrating hose is coated with the lubricant before penetration, the end of the penetrating hose is processed into a tapered guide-in structure during penetration operation, the penetrating hose is aligned with the entrance of the annular gap, and the penetrating hose is pushed along the axial direction so that the penetrating hose is uniformly distributed between the thin-wall sleeve and the glue injection joint inner core. In step S2, the remaining glue injection holes are closed by the detachable sealing plug before water injection, and only one glue injection hole is reserved as a water inlet. In step S3, the assembled glue injection joint is connected with the plunger pump, a high-pressure water injection channel is formed through the glue injection hole, the plunger pump is started, high-pressure water is injected into the glue cavity at a pressure of about 10 MPa, the water injection rate is controlled within a certain range so that the water is uniformly diffused in the glue cavity, the high-pressure state is maintained for 5 minutes, the thin-wall sleeve is plastically deformed under the water pressure, the pressure change is monitored in real time during the deformation process, and it is ensured that the thin-wall sleeve uniformly wraps the penetrating hose. In step S4, after the high-pressure water injection and pressure maintaining process is completed, the pressure of the plunger pump is gradually reduced, the closed glue injection holes are opened in sequence, the water in the glue cavity is discharged under the residual pressure, the glue cavity is blown by the compressed air through the glue injection hole, and the glue injection joint is inclined so that the residual water is collected to the low-position glue injection hole and discharged. ​ 4. The method of claim 3, wherein ​ 5. The method of claim 3, wherein, ​ 6. The method of claim 3, wherein, ​ 7. The method of claim 3, wherein the step of injecting the adhesive is performed by a dispenser. ​ 8. The method of claim 3, wherein, In step S5, after the glue cavity drainage treatment is completed, at least four glue injection holes are selected as glue injection channels, and the remaining glue injection holes are used as exhaust channels; a multi-head glue injection gun is used to inject sealant from the selected glue injection holes simultaneously, the glue outflow of the exhaust holes is monitored in real time during the glue injection process, when sealant continuously flows out, the corresponding exhaust holes are closed in turn; the glue injection sequence of the glue injection holes is adjusted, and the diagonal line alternate glue injection method is adopted to ensure that the sealant in the glue cavity is uniformly filled; when sealant flows out from all exhaust holes, the glue injection pressure is maintained for a predetermined time to ensure that the glue cavity is completely filled; after stopping glue injection, all glue injection holes are immediately closed to prevent the backflow of sealant.

9. The method of claim 4, wherein, In step S1, before formally inserting the hose, the thin-walled sleeve is first pre-expanded by a mechanical expansion device, and the inner diameter of the thin-walled sleeve is uniformly increased by a certain size by hydraulic or mechanical means; when the inserted hose completely passes through the annular gap, the pre-expansion force is removed to restore the thin-walled sleeve to near the original size, at which time the inserted hose is uniformly wrapped between the thin-walled sleeve and the inner core of the glue joint, forming a tight fit.

10. The method of claim 5, wherein, In step S2, the sealing plug is fixed in the glue injection hole by thread connection and interference fit.

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