Thermal-insulation wear-resistant non-metal connection joint and preparation and connection method thereof

Abstract

The invention discloses a thermal-insulation wear-resistant non-metal connection joint and a preparation and connection method thereof, the thermal-insulation wear-resistant non-metal connection joint comprises a hollow joint sleeve, the outer side of the joint sleeve is provided with a fiber reinforcement layer, a resistive sensing chip is arranged between the joint sleeve and the fiber reinforcement layer, and the resistive sensing chip is wirelessly connected with a data processing end; a resistance wire is wound in the connector sleeve, the two ends of the resistance wire are connected with binding posts, and the inner wall of the connector sleeve is a sleeve inner conical surface. The preparation method comprises the following steps: putting the thermoplastic plastic powder, the color master batch, the polyolefin elastomer and the carbon aerogel powder into a stirrer, and stirring to obtain a uniform mixed material; enabling the mixed material to sequentially pass through an extruder, a granulator and an injection molding machine to obtain a prepared joint; and finally, the glass fiber or basalt fiber infiltrated vinyl resin is wound on the outer surface of the prepared connector to form a fiber reinforced layer, and the non-metal connector is obtained. The problem that in the prior art, a non-metal joint is low in pressure bearing capacity is solved, and high pressure resistance, heat preservation and wear resistance are achieved.

Description

Technical Field

[0001] This invention belongs to the field of non-metallic flexible composite pipe technology, specifically relating to heat-insulating and wear-resistant non-metallic connecting joints. This invention also relates to the preparation method and connection method of the above-mentioned connecting joints. Background Technology

[0002] Compared to traditional metal pipelines, non-metallic flexible composite pipelines offer advantages such as light weight, high flexibility, corrosion resistance, low fluid transport resistance, and environmental friendliness and economy. Furthermore, their flexible design allows them to easily adapt to various terrains and complex construction environments, reducing installation difficulty and costs. Due to their unique performance advantages, non-metallic flexible composite pipelines are gradually becoming an important choice for oilfield gathering and transportation systems. However, as oil and gas field development enters its later stages, the requirements for pipeline performance are gradually increasing, particularly thermal insulation and wear resistance, which have become crucial factors that cannot be ignored. On the one hand, the crude oil or other fluids transported in the pipeline need to maintain a stable temperature to avoid pipeline blockage and corrosion; on the other hand, the various media transported in the pipeline will cause erosion and wear, reducing the service life of the pipeline system.

[0003] Insulation and wear-resistant treatment of pipeline connections are crucial for ensuring the performance and lifespan of the entire pipeline system. There are two main connection methods for non-metallic flexible composite pipelines: metal crimp connections and non-metallic joint connections. Metal joint connections suffer from high costs and poor corrosion resistance. Furthermore, while metal joints primarily use internal / external coatings for insulation, these coatings can peel off under the impact of long-term transported media and external environmental factors. These factors significantly increase maintenance and repair costs in oilfields and reduce pipeline lifespan. Non-metallic joints, as a non-metallic pipeline connection technology, offer advantages such as corrosion resistance, low cost, ability to achieve large diameters, and high automation. However, traditional non-metallic joints have low pressure resistance, lack insulation properties, and the polymer materials used have poor wear resistance, making them unsuitable for the current pipeline gathering and transportation requirements of oilfields. Summary of the Invention

[0004] The primary objective of this invention is to provide a heat-insulating and wear-resistant non-metallic connector, which solves the problem of low pressure-bearing capacity of non-metallic connectors in the prior art.

[0005] The second objective of this invention is to provide a method for preparing a heat-insulating and wear-resistant non-metallic connector, which produces a non-metallic connector with high pressure resistance, heat insulation, and wear resistance.

[0006] A third objective of this invention is to provide a connection method for a heat-insulating and wear-resistant non-metallic connector.

[0007] The first technical solution adopted in this invention is a heat-insulating and wear-resistant non-metallic connector, including a hollow connector sleeve, the outer surface of the connector sleeve is covered with a fiber reinforcement layer, a resistive sensing chip is disposed between the connector sleeve and the fiber reinforcement layer, and the resistive sensing chip is wirelessly connected to a data processing terminal. The connector sleeve has a resistance wire wound inside. The connector sleeve and the fiber reinforcement layer have conductive holes at both ends of the resistance wire. The conductive holes have terminals that are connected to both ends of the resistance wire. The inner wall of the connector sleeve is a conical surface.

[0008] The first technical solution of the present invention is further characterized in that, The taper of the inner conical surface of the sleeve is 0.5°~20°.

[0009] At least one pair of resistive sensing chips should be provided.

[0010] The fiber reinforcement layer is made of glass fiber or basalt fiber impregnated with vinyl ester resin and wound onto the outer surface of the joint sleeve.

[0011] The second technical solution adopted in this invention is a method for preparing a heat-insulating and wear-resistant non-metallic connecting joint, which specifically includes the following steps: Step 1: Weigh the following raw materials according to their mass percentages: Thermoplastic powder 60%~70%, color masterbatch 5%~10%, polyolefin elastomer 5%~10%, carbon aerogel powder 20%, the total content of the above raw materials is 100%; Step 2: Put the thermoplastic powder, color masterbatch, polyolefin elastomer, and carbon aerogel powder into a mixer and stir to obtain a uniform mixture. Step 3: Add the mixture into the hopper of the extruder and extrude to obtain a linear composite. Step 4: Granulate the composite linear compound using a granulator to obtain composite particles; Step 5: Set chip grooves and inner conical structures in the injection molding machine, and injection mold the composite particles to obtain the connector sleeve. Then, put the connector sleeve into the wire winding machine for resistance wire winding and embedding. Then, embed the resistive sensing chip into the groove to obtain the pre-connector. Step 6: Impregnate glass fiber or basalt fiber with vinyl ester resin and wrap it around the outer surface of the pre-joint to form a fiber reinforcement layer, thereby obtaining a heat-insulating and wear-resistant non-metallic joint.

[0012] The second technical solution of the present invention is further characterized in that, In step 2, the stirring speed of the stirrer is 60 r / min to 80 r / min, and the stirring time is 0.5 h to 1 h.

[0013] In step 3, the operating temperature of the extruder is 180℃~220℃, and the screw speed in the extruder is 50rpm~60rpm.

[0014] In step 6, glass fiber or basalt fiber is impregnated with vinyl ester resin, wrapped around the outer surface of the pre-prepared joint, and cured at room temperature for 24 hours to obtain a fiber-reinforced layer.

[0015] In step 1, the thermoplastic powder is any one or more of PP, PA, and PE mixed in any proportion.

[0016] The third technical solution adopted in this invention is a connection method for a heat-insulating and wear-resistant non-metallic connector, which specifically includes the following steps: S1. First, put the non-metallic connector on the pipe body of one side of the composite pipe. Then, cut the composite pipe reinforcement layer and the outer protective layer of the composite pipe at the connection end of the two composite pipes to expose the inner lining layer of the composite pipe. S2, the inner lining of the composite pipes exposed on both sides are bonded together by hot melt butt bonding, and the joint is manually sanded with sandpaper to make the surface of the inner lining of the composite pipe at the joint smooth. S3, at the joint of the inner lining of the hot-melt butt-welded composite pipe, fill with glass fiber material and adhesive resin until it is flush with the outer protective layer of the composite pipe; and grind a taper on the surface of the outer protective layer of the composite pipe to match the inner conical surface of the sleeve. S4. Move the non-metallic connector to the composite pipe connection point so that the reverse conical structure corresponds. Then, heat the resistance wire through the terminal block to achieve electrofusion heating, so that the connector sleeve is bonded to the outside of the composite pipe.

[0017] The beneficial effects of this invention are: (1) In the preparation method of the wear-resistant non-metallic connection joint of the present invention, the use of polyolefin elastomer can improve the wear resistance and elastic modulus of thermoplastic plastic. In the connection of pipe tee joints, etc., the scouring and wear caused by the conveying medium can be reduced, and the service life of the pipeline system can be improved.

[0018] (2) In the preparation method of the wear-resistant non-metallic joint of the present invention, carbon aerogel powder is used. On the one hand, it plays a role in heat preservation at the joint connection; on the other hand, the graphene or carbon nanotubes in the carbon aerogel powder can enhance the conductivity of the plastic material. By measuring the resistance value of the resistive sensing chip in the non-metallic joint, the temperature and pressure changes of the joint can be monitored remotely. This monitoring method is simple to operate and does not require additional equipment, meeting the needs of "intelligent" management in oil fields.

[0019] (3) In the preparation method of the wear-resistant non-metallic joint of the present invention, the joint sleeve is prepared by using thermoplastic plastic powder of the same material as the outer protective layer of the composite pipe. This not only improves the reliability and sealing of electrofusion bonding, but also has the same corrosion resistance as the pipe. The vinyl ester resin used in the fiber reinforcement layer not only has good bonding strength, which can firmly bond the fiber reinforcement material and the joint sleeve, but also has the advantage of corrosion resistance, which can further improve the corrosion resistance of non-metallic joints and reduce the difficulty of replacing metal joints that are not corrosion resistant in the past.

[0020] (4) The connection method of the heat-insulating and wear-resistant non-metallic connector of the present invention adopts a reverse conical structure, a hot melt-electrofusion connection method, and fills the connection pipe with fiber reinforcement material, which can overcome the force of the composite pipe body moving in the opposite direction under the action of external force, and improve the strength, reliability and sealing of the connection part between the connector and the composite pipe. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the heat-insulating and wear-resistant non-metallic connector of the present invention; Figure 2 This is a schematic diagram of the connection of the heat-insulating and wear-resistant non-metallic connector of the present invention.

[0022] In the figure, 1. Connector sleeve, 2. Fiber reinforcement layer, 3. Inner conical surface of sleeve, 4. Terminal, 5. Resistive sensor chip, 6. Inner lining of composite tube, 7. Reinforcing layer of composite tube, 8. Outer protective layer of composite tube, 9. Filling fiber, 10. Outer conical surface of composite tube, 11. Resistance wire. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Example 1 This invention relates to a heat-insulating and wear-resistant non-metallic connecting joint, such as... Figure 1 As shown, it includes a hollow connector sleeve 1, the outer surface of which is covered with a fiber reinforcement layer 2, a resistive sensing chip 5 disposed between the connector sleeve 1 and the fiber reinforcement layer 2, and the resistive sensing chip 5 is wirelessly connected to a data processing terminal.

[0025] Furthermore, for temperature monitoring, a thermistor-type sensor chip can be selected, as the resistance value of a thermistor changes significantly with temperature. Since the resistance change signal output by a resistive sensor chip may be relatively weak and easily affected by environmental factors, a signal conditioning circuit needs to be designed to amplify and filter it. For example, an operational amplifier can be used to build an amplification circuit to convert the resistance change into a voltage change and amplify it, and then a low-pass filter can be used to remove high-frequency noise, making the signal more stable and accurate.

[0026] For pressure monitoring, resistive pressure sensor chips typically consist of two electrodes and a resistive diaphragm. When pressure is applied to the sensor, the contact points between the electrodes tighten, causing the resistance of the diaphragm to increase. By measuring the change in the resistance of the diaphragm, the pressure magnitude can be calculated. The resistance signal output by the pressure sensor chip also needs to undergo similar signal conditioning to ensure the accuracy and reliability of the measurement. Based on the characteristics and output range of the pressure sensor, the gain and filtering parameters of the amplifier circuit are adjusted to accurately reflect pressure changes.

[0027] When performing wireless transmission, the resistive sensing chip 5 can use Bluetooth Low Energy mode, Wi-Fi module or LoRa module.

[0028] If the monitoring distance is relatively short and power consumption is a concern, a Bluetooth Low Energy (BLE) module can be selected. BLE modules offer advantages such as low power consumption and ease of connection to mobile devices and embedded systems. The analog voltage signal, after signal conditioning, is converted into a digital signal via an analog-to-digital converter (ADC), and then transmitted to the data processing terminal through the BLE module. When configuring a BLE module, parameters such as the communication baud rate, device name, and connection password need to be set to ensure stable data transmission.

[0029] If the monitoring site has Wi-Fi network coverage and high data transmission rates are required, a Wi-Fi module can be used. Wi-Fi modules enable high-speed data transmission, but they consume relatively more power. Similarly, analog signals need to be converted to digital signals before connecting to the local network via the Wi-Fi module and sending the data to a remote data processing terminal. Wi-Fi module configuration includes settings for network name (SSID), password, and IP address.

[0030] LoRa technology features long-distance transmission and low power consumption, enabling reliable data transmission in complex environments. When using a LoRa module, parameters such as frequency, spreading factor, and bandwidth need to be set correctly to ensure effective data transmission.

[0031] The connector sleeve 1 has a resistance wire 11 wound inside. The connector sleeve 1 and the fiber reinforcement layer 2 have conductive holes at both ends of the resistance wire 11. The conductive holes have terminals 4 inserted into them. The terminals 4 are connected to both ends of the resistance wire 11 respectively. The inner wall of the connector sleeve 1 is the inner conical surface 3 of the sleeve.

[0032] Example 2 This invention relates to a heat-insulating and wear-resistant non-metallic connector, comprising a hollow connector sleeve 1, the outer surface of which is covered with a fiber reinforcement layer 2. A resistive sensing chip 5 is disposed between the connector sleeve 1 and the fiber reinforcement layer 2, and at least one pair of resistive sensing chips 5 are provided. The resistive sensing chip 5 is wirelessly connected to a data processing terminal.

[0033] The connector sleeve 1 has a resistance wire 11 wound inside. The connector sleeve 1 and the fiber reinforcement layer 2 have conductive holes at both ends of the resistance wire 11. The conductive holes have terminals 4 inserted into them. The terminals 4 are connected to both ends of the resistance wire 11. The inner wall of the connector sleeve 1 is a sleeve inner conical surface 3 with a taper of 0.5° to 20°.

[0034] With a taper ranging from 0.5° to 20°, this structure allows for a more even distribution of stress among the components. Compared to abrupt changes in structural shape, this gradually changing inverted tapering can better withstand external loads, thereby enhancing the stability and safety of the entire structure.

[0035] Example 3 The present invention relates to a heat-insulating and wear-resistant non-metallic connector, comprising a hollow connector sleeve 1, the outer surface of which is covered with a fiber reinforcement layer 2, wherein the fiber reinforcement layer 2 is made of glass fiber or basalt fiber impregnated with vinyl ester resin and wound onto the outer surface of the connector sleeve 1.

[0036] A resistive sensing chip 5 is disposed between the connector sleeve 1 and the fiber reinforcement layer 2, and at least one pair of resistive sensing chips 5 are disposed. The resistive sensing chip 5 is wirelessly connected to a data processing terminal.

[0037] The connector sleeve 1 has a resistance wire 11 wound inside. The connector sleeve 1 and the fiber reinforcement layer 2 have conductive holes at both ends of the resistance wire 11. The conductive holes have terminals 4 inserted into them. The terminals 4 are connected to both ends of the resistance wire 11. The inner wall of the connector sleeve 1 is a sleeve inner conical surface 3 with a taper of 0.5° to 20°.

[0038] Example 4 The method for preparing the thermal insulation and wear-resistant non-metallic connecting joint of the present invention specifically includes the following steps: Step 1: Weigh the following raw materials according to their mass percentages: The total content of the above raw materials is 100%, consisting of 60%~70% thermoplastic powder, 5%~10% color masterbatch, 5%~10% polyolefin elastomer, and 20% carbon aerogel powder.

[0039] The joint sleeve 1 is made of thermoplastic powder of the same material as the outer protective layer of the composite pipe, which not only improves the reliability and sealing of electrofusion bonding, but also has the same corrosion resistance as the pipe.

[0040] Polyolefin elastomers (POEs) are high-performance thermoplastic elastomers that rapidly recover their original shape after stretching and possess good flexibility. They remain soft even at low temperatures. POEs typically have a low density, generally between 0.86-0.90 g / cm³, resulting in lightweight products. Furthermore, POEs exhibit good tensile and tear strength. Their tensile strength is generally between 5-30 MPa, and their tear strength can reach 50-200 kN / m, giving them excellent resistance to tensile and tearing forces. POEs also possess good abrasion resistance, maintaining good surface integrity during friction with other surfaces.

[0041] The preparation method of the present invention, by using polyolefin elastomer, can improve the wear resistance and elastic modulus of thermoplastic plastics. In pipe tee joints and other connections, it can reduce the erosion and wear caused by the transported medium and improve the service life of the pipeline system.

[0042] The use of carbon aerogel powder serves two purposes: firstly, it provides insulation at the joint connection; secondly, the graphene or carbon nanotubes in the carbon aerogel powder enhance the conductivity of the plastic material. By measuring the resistance value of the resistive sensing chip 5 in the non-metallic joint, the temperature and pressure changes of the joint can be monitored remotely.

[0043] The resistance value of the resistive sensor chip 5 can be measured using a multimeter, a bridge circuit, a voltmeter-ammeter method, or a dedicated instrument.

[0044] Step 2: Place the thermoplastic powder, color masterbatch, polyolefin elastomer, and carbon aerogel powder into a stirrer. Stir at a speed of 60 r / min to 80 r / min for 0.5 h to 1 h to obtain a uniform mixture.

[0045] Step 3: Add the compound to the hopper of the extruder. The operating temperature of the extruder is 180℃~220℃, and the screw speed in the extruder is 50rpm~60rpm to extrude the linear compound.

[0046] Step 4: Granulate the composite linear composite using a granulator to obtain composite particles.

[0047] Extrusion granulators primarily use components such as screws or rollers to apply pressure to materials, forcing them through die orifices of a specific shape under pressure to form granules. After entering the granulator, the material is first conveyed to the extrusion zone. For example, in a screw extrusion granulator, the rotating screw propels the material forward and gradually compresses it. As the material advances, the pressure continuously increases, and when it reaches the die area, it is extruded through the die orifice under high pressure.

[0048] Specifically, the raw materials are first pre-treated, including crushing and mixing, to ensure uniform particle size and composition. Taking compound fertilizer production as an example, nitrogen, phosphorus, and potassium fertilizer raw materials are mixed in proportion and crushed into suitable particle sizes. The mixed material is then fed into the hopper of an extrusion granulator. In the granulator, the material is gradually compacted under the action of the screw, extruded through a die, and the extruded strip is then cut into granules of appropriate length by a cutter. The cutting speed can be adjusted according to the required granule length.

[0049] Step 5: Set chip grooves and inner conical structures in the injection molding machine, and injection mold the composite particles to obtain connector sleeve 1. Then, put connector sleeve 1 into a wire winding machine to wind and embed resistance wire 11. Then, embed the resistive sensing chip 5 into the groove to obtain the pre-connector.

[0050] Injection molding machines combine the thermal processing characteristics of plastics with the principles of metal melting and die casting. Their working principle involves feeding material from a hopper into a heated barrel, melting the material, and then uniformly plasticizing it under the shearing and pushing action of a screw. The molten material is then injected into a mold cavity under specific pressure and temperature, and after cooling and solidification, a plastic product is obtained. The present invention addresses this by incorporating a chip recess and an inner conical structure within the mold cavity, enabling the injection-molded connector sleeve 1 to possess an inner conical surface 3 and a structure for mounting a resistive sensor chip 5.

[0051] When winding the resistance wire 11 using a wire winding machine, it is essential to ensure the machine is in good working order. This includes checking the mechanical transmission components for proper operation and the electrical components, such as the motor and controller, for stable operation. The wire winding machine typically has a rotatable mandrel for holding the connector sleeve 1. It also includes a wire feeding mechanism to precisely control the feeding speed and tension of the resistance wire.

[0052] Install a mandrel of suitable size on the rotating device of the yarn-winding machine. The length of the mandrel should generally be slightly longer than that of the sleeve to facilitate fixing and subsequent operations. Carefully slip the connector sleeve 1 onto the mandrel, and position the sleeve using the fixing device on the mandrel to ensure that the sleeve will not move or rotate axially during winding. Lead one end of the resistance wire out from the yarn feeding mechanism of the yarn-winding machine, and guide it to the starting end of the sleeve through a series of guide wheels or guide nozzles. Set a suitable tension control system on the yarn feeding mechanism, and maintain appropriate tension of the resistance wire during winding by adjusting the pressure of the tension wheel or other tension adjustment devices. Start the rotating device and yarn feeding mechanism of the yarn-winding machine. The mandrel begins to drive the sleeve to rotate at a uniform speed, while the yarn feeding mechanism feeds the resistance wire into the inner wall of the sleeve for winding at the set speed.

[0053] After winding, the resistance wire needs to be secured to prevent it from loosening during subsequent use. Adhesives, such as high-temperature resistant glue, can be used to firmly bond the end of the resistance wire to the inner wall of the sleeve.

[0054] Step 6: Impregnate glass fiber or basalt fiber with vinyl ester resin and wrap it around the outer surface of the prepared joint. Allow it to cure at room temperature for 24 hours to obtain a heat-insulating and wear-resistant non-metallic joint.

[0055] The vinyl ester resin used in the fiber reinforcement layer 2 not only has good bonding strength, which can firmly bond the fiber reinforcement material and the joint sleeve 1, but also has the advantage of corrosion resistance, which can further improve the corrosion resistance of non-metallic joints and reduce the difficulty of replacing metal joints that are not corrosion resistant in the past.

[0056] Furthermore, in step 1, the thermoplastic powder is any one or a mixture of PP, PA, and PE.

[0057] Furthermore, in step 1, different colors of masterbatch can be used as needed to ensure that the final non-metallic connector is the desired color.

[0058] Example 5 The preparation method of the heat-insulating and wear-resistant non-metallic connector in this embodiment specifically includes the following steps: Step 1: Weigh the following raw materials according to their mass percentages: The total content of the above raw materials is 100%, consisting of 70% PE, 5% black masterbatch, 5% polyolefin elastomer, and 20% carbon aerogel powder.

[0059] Step 2: Place the thermoplastic powder, color masterbatch, polyolefin elastomer, and carbon aerogel powder into a stirrer. Stir at a speed of 60 r / min for 1 hour to obtain a uniform mixture.

[0060] Step 3: Add the compound to the hopper of the extruder. The operating temperature of the extruder is 220℃ and the screw speed in the extruder is 60 rpm to extrude the linear composite.

[0061] Step 4: Granulate the composite linear composite using a granulator to obtain composite particles.

[0062] Step 5: Set chip grooves and inner conical structures in the injection molding machine, and injection mold the composite particles to obtain connector sleeve 1. Then, put connector sleeve 1 into a wire winding machine to wind and embed resistance wire 11. Then, embed the resistive sensing chip 5 into the groove to obtain the pre-connector.

[0063] Step 6: Impregnate glass fiber with vinyl ester resin and wrap it around the outer surface of the prepared joint. Allow it to cure at room temperature for 24 hours to obtain a heat-insulating and wear-resistant non-metallic joint.

[0064] Example 6 The preparation method of the heat-insulating and wear-resistant non-metallic connector in this embodiment specifically includes the following steps: Step 1: Weigh the following raw materials according to their mass percentages: The total content of the above raw materials is 100%, consisting of 65% PP, 3% black masterbatch, 4% blue masterbatch, 8% polyolefin elastomer, and 20% carbon aerogel powder.

[0065] Step 2: Place the thermoplastic powder, color masterbatch, polyolefin elastomer, and carbon aerogel powder into a stirrer. Stir at 80 r / min for 0.5 h to obtain a uniform mixture.

[0066] Step 3: Add the compound to the hopper of the extruder. The operating temperature of the extruder is 180℃ and the screw speed in the extruder is 50 rpm to extrude the linear composite.

[0067] Step 4: Granulate the composite linear composite using a granulator to obtain composite particles.

[0068] Step 5: Set chip grooves and inner conical structures in the injection molding machine, and injection mold the composite particles to obtain connector sleeve 1. Then, put connector sleeve 1 into a wire winding machine to wind and embed resistance wire 11. Then, embed the resistive sensing chip 5 into the groove to obtain the pre-connector.

[0069] Step 6: Impregnate glass fiber with vinyl ester resin and wrap it around the outer surface of the prepared joint. Allow it to cure at room temperature for 24 hours to obtain a heat-insulating and wear-resistant non-metallic joint.

[0070] Example 7 The preparation method of the heat-insulating and wear-resistant non-metallic connector in this embodiment specifically includes the following steps: Step 1: Weigh the following raw materials according to their mass percentages: PA 60%, black masterbatch 6%, blue masterbatch 4%, polyolefin elastomer 10%, carbon aerogel powder 20%, the total content of the above raw materials is 100%.

[0071] Step 2: Place the thermoplastic powder, color masterbatch, polyolefin elastomer, and carbon aerogel powder into a stirrer. Stir at a speed of 70 r / min for 0.8 h to obtain a uniform mixture.

[0072] Step 3: Add the compound to the hopper of the extruder. The operating temperature of the extruder is 200℃ and the screw speed in the extruder is 55 rpm to extrude the linear compound.

[0073] Step 4: Granulate the composite linear composite using a granulator to obtain composite particles.

[0074] Step 5: Set chip grooves and inner conical structures in the injection molding machine, and injection mold the composite particles to obtain connector sleeve 1. Then, put connector sleeve 1 into a wire winding machine to wind and embed resistance wire 11. Then, embed the resistive sensing chip 5 into the groove to obtain the pre-connector.

[0075] Step 6: Impregnate glass fiber with vinyl ester resin and wrap it around the outer surface of the prepared joint. Allow it to cure at room temperature for 24 hours to obtain a heat-insulating and wear-resistant non-metallic joint.

[0076] Example 8 The connection method of the thermal insulation and wear-resistant non-metallic connector of the present invention uses the thermal insulation and wear-resistant non-metallic connector prepared in the above embodiments, such as... Figure 2 Specifically, it includes the following steps: S1. First, put the non-metallic connector on the body of the composite pipe on one side. Then, cut the composite pipe reinforcement layer 7 and the composite pipe outer protective layer 8 at the connection end of the two composite pipes to expose the composite pipe inner lining layer 6 with the required docking width.

[0077] S2, the inner lining layer 6 of the composite pipes protruding from both sides is bonded together by hot melt butt bonding at a temperature of 190℃~220℃, and the joint is manually sanded with sandpaper to make the surface of the inner lining layer 6 of the composite pipe at the joint smooth.

[0078] S3, at the joint of the hot-melt butt-welded inner lining layer 6 of the composite pipe, glass fiber material and adhesive resin are filled to be flush with the outer protective layer 8 of the composite pipe; and a taper that matches the inner conical surface 3 of the sleeve is ground on the surface of the outer protective layer 8 of the composite pipe to form the outer conical surface 10 of the composite pipe.

[0079] S4, move the non-metallic connector to the composite pipe connection point so that the reverse conical structure corresponds, and then heat the resistance wire 11 through the terminal 4 to achieve electrofusion heating, so that the connector sleeve 1 is bonded to the outside of the composite pipe.

[0080] The present invention relates to a connection method for a heat-insulating and wear-resistant non-metallic connector. It adopts a reverse conical structure and a hot-melt-electrofusion connection method. Fiber-reinforced material is filled at the connection pipe position, which can overcome the force that causes the composite pipe to move in the opposite direction under external force, thereby improving the strength, reliability, and sealing of the connection between the connector and the composite pipe.

[0081] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0082] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0083] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat-insulating and wear-resistant non-metallic connecting joint, characterized in that, It includes a hollow connector sleeve (1), the outer surface of which is covered with a fiber reinforcement layer (2), a resistive sensing chip (5) is disposed between the connector sleeve (1) and the fiber reinforcement layer (2), and the resistive sensing chip (5) is wirelessly connected to a data processing terminal. The connector sleeve (1) is internally wound with a resistance wire (11). The connector sleeve (1) and the fiber reinforcement layer (2) have conductive holes at both ends of the resistance wire (11). A terminal (4) is inserted into the conductive hole. The terminal (4) is connected to both ends of the resistance wire (11). The inner wall of the connector sleeve (1) is the inner conical surface (3) of the sleeve.

2. The heat-insulating and wear-resistant non-metallic connecting joint according to claim 1, characterized in that, The taper of the inner conical surface (3) of the sleeve is 0.5°~20°.

3. The heat-insulating and wear-resistant non-metallic connecting joint according to claim 1, characterized in that, The resistive sensing chip (5) is provided in at least one pair.

4. The heat-insulating and wear-resistant non-metallic connecting joint according to claim 1, characterized in that, The fiber reinforcement layer (2) is made of glass fiber or basalt fiber impregnated with vinyl ester resin and wound onto the outer surface of the joint sleeve (1).

5. A method for preparing a heat-insulating and wear-resistant non-metallic connecting joint, characterized in that, The method for preparing the heat-insulating and wear-resistant non-metallic connecting joint as described in any one of claims 1 to 4 specifically includes the following steps: Step 1: Weigh the following raw materials according to their mass percentages: Thermoplastic powder 60%~70%, color masterbatch 5%~10%, polyolefin elastomer 5%~10%, carbon aerogel powder 20%, the total content of the above raw materials is 100%; Step 2: Put the thermoplastic powder, color masterbatch, polyolefin elastomer, and carbon aerogel powder into a mixer and stir to obtain a uniform mixture. Step 3: Add the mixture into the hopper of the extruder and extrude to obtain a linear composite. Step 4: Granulate the composite linear compound using a granulator to obtain composite particles; Step 5: Set chip grooves and inner conical structures in the injection molding machine, and injection mold the composite particles to obtain the connector sleeve (1). Then, put the connector sleeve (1) into the wire winding machine to wind and embed the resistance wire (11). Then, embed the resistive sensing chip (5) into the groove to obtain the pre-connector. Step 6: Impregnate glass fiber or basalt fiber with vinyl ester resin and wrap it around the outer surface of the pre-joint to form a fiber reinforcement layer (2), thereby obtaining a heat-insulating and wear-resistant non-metallic joint.

6. The method for preparing the heat-insulating and wear-resistant non-metallic connecting joint according to claim 5, characterized in that, In step 2, the stirring speed of the stirrer is 60 r / min to 80 r / min, and the stirring time is 0.5 h to 1 h.

7. The method for preparing the heat-insulating and wear-resistant non-metallic connecting joint according to claim 5, characterized in that, In step 3, the operating temperature of the extruder is 180℃~220℃, and the screw speed in the extruder is 50rpm~60rpm.

8. The method for preparing the heat-insulating and wear-resistant non-metallic connecting joint according to claim 5, characterized in that, In step 6, glass fiber or basalt fiber is impregnated with vinyl ester resin, wrapped around the outer surface of the pre-joint, and cured at room temperature for 24 hours to obtain the fiber-reinforced layer (2).

9. The method for preparing the heat-insulating and wear-resistant non-metallic connecting joint according to claim 5, characterized in that, In step 1, the thermoplastic powder is any one or more of PP, PA, and PE mixed in any proportion.

10. A connection method for a heat-insulating and wear-resistant non-metallic joint, characterized in that, The thermal insulation and wear-resistant non-metallic connecting joint as described in any one of claims 1 to 4 is adopted, specifically Includes the following steps: S1. First, put the non-metallic connector on the pipe body of one side of the composite pipe. Then, cut the composite pipe reinforcement layer (7) and the outer protective layer (8) at the pipe end of the connection between the two composite pipes to expose the inner lining layer (6) of the composite pipe. S2, the inner lining layer (6) of the composite pipes exposed on both sides is bonded together by hot melt butt bonding, and the joint is manually polished with sandpaper to make the surface of the inner lining layer (6) of the composite pipe at the joint smooth. S3, at the joint of the hot-melt butt-welded inner lining (6) of the composite pipe, fill with glass fiber material and adhesive resin until it is flush with the outer protective layer (8) of the composite pipe; and grind a taper that matches the inner conical surface (3) of the sleeve on the surface of the outer protective layer (8) of the composite pipe. S4, move the non-metallic connector to the composite pipe connection point so that the reverse conical structure corresponds, and then heat the resistance wire (11) through the terminal (4) to achieve electrofusion heating, so that the connector sleeve (1) is bonded to the outside of the composite pipe.

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