345 results about "Bond line" patented technology

The invention relates to the technical field of road engineering, in particular to a high-performance warm-mixing high-modulus dense water pavement structure and a preparation method thereof. The waterproof bonding layer is prepared by mixing an epoxy resin main agent, a microencapsulated amine curing agent, a functional diluent and filler according to the mass ratio of (50-60): (25-35): (5-8): (12-18), and the filler is expanded vermiculite powder; the mixture lower layer is prepared by mixing a high modulus agent, a lower layer warm mixing agent, asphalt, aggregate and mineral powder according to the mass ratio of (0.4-0.8): (0.3-1.1): (5-6.5): (80-85): (2-5); the high-modulus agent is prepared by mixing POE (Polyolefin Elastomer), modified sepiolite, an interfacial compatibilizer and an anti-aging agent according to the mass ratio of (72-78): (16-20): (4-6): (1-2); a non-stick wheel bonding layer; preparing a mixture upper layer; a curing agent is added into epoxy resin in a microcapsule mode, construction heat triggers microcapsule breaking to achieve accurate epoxy curing, molten POE forms a barb structure in vermiculite gradient pores, sepiolite fibers puncture to construct an anchor chain framework, the three components cooperate to eliminate an interface weak area, and stripping resistance is improved in a leap-over mode.

The invention provides a heat dissipation composite material and a preparation method and application thereof. The heat dissipation composite material comprises a bonding layer, an insulating breathable layer, a heat conduction layer and a heat conduction diffusion layer which are sequentially arranged from bottom to top. Wherein the bonding layer is obtained by mixing and reacting a polymer matrix material, a composite filler and a molecular bridging agent, the insulating breathable layer is a porous insulating material, the heat conduction layer is a graphene film, and the heat conduction diffusion layer is prepared from porous matrix composite heat conduction nanoparticles. According to the invention, through combination and structural design of each layer of material, a synergistic effect of a multi-layer structure is realized, firm and stable bonding of the heat dissipation composite material and a heating electronic device is realized, the heat dissipation efficiency and insulation air permeability of the heat dissipation composite material are remarkably improved, and the heat dissipation requirement of high-power-density electronic equipment can be met.

The utility model relates to a dimming assembly and a vehicle. The dimming assembly comprises a first transparent substrate, a first bonding layer, a dimming layer, a second bonding layer and a second transparent substrate which are sequentially arranged in a stacked mode. Wherein the first bonding layer, the dimming layer and the second bonding layer are all shrunk inwards relative to the first transparent substrate and the second transparent substrate, the dimming assembly further comprises a sealant layer, and the sealant layer is arranged in at least part of the shrunk-inwards area and makes contact with the first transparent substrate and the second transparent substrate. The side edge of the sealing glue layer does not exceed the side edges of the first transparent substrate and the second transparent substrate, and the width of the sealing glue layer is larger than or equal to 1 mm. The dimming assembly has a good water vapor erosion resistant effect.

A headgear for use in the Positive Airway Pressure field includes an inner layer, a bonding layer, a padding layer, film layers, and an adhesive. The inner layer is configured to be at least partially in contact with a patient's skin during use, while the bonding layer is configured to adhere an outer side of the headgear, which comes into contact with the air, to a fixed part by folding the headgear, thereby tightening or loosening the headgear. The padding layer, placed between the inner layer and the bonding layer, increases thickness. The film layers are provided between the inner layer and the padding layer, as well as between the padding layer and the bonding layer. The adhesive is configured to bond the layers together. The headgear has at least three layers and is made of at least two types of textile materials.

The invention discloses a surface protective film and a preparation method thereof, and belongs to the technical field of protective films. The surface protection film comprises a surface layer, a core layer and a bonding layer which are arranged in sequence, the surface layer comprises first polypropylene matrix resin, an organic ultraviolet absorbent and an inorganic ultraviolet screening agent; the core layer comprises second polypropylene matrix resin, polyaryletherketone nanofibers and flaky mica powder of which the surface is coated with cerium oxide; the bonding layer comprises a thermoplastic SEBS elastomer, hydrogenated bonding resin, an organic zinc compound, an ultraviolet light stabilizer and a plasticizer containing an epoxy group. The surface protection film has excellent ultraviolet aging resistance and high temperature resistance, the adhesive force can still be kept within a certain range under the conditions of ultraviolet radiation and high temperature, the surface protection film can be easily unwound under the condition of high temperature, and no residual adhesive is separated out.

The invention discloses a high-corrosion-resistance lithium battery aluminum plastic film and a preparation method thereof. The aluminum plastic film comprises a multi-layer structure from inside to outside: a modified polypropylene inner layer, a first bonding layer, a first modified aluminum foil layer, a second bonding layer, a second modified aluminum foil layer, a third bonding layer and a nylon outer layer. The bonding layer adopts a disulfide bond-containing polyurethane prepolymer, the modified polypropylene inner layer has a micro-nano structure, and the surface of the modified aluminum foil is coated with an Al2O3 and fluorinated graphene gradient corrosion-resistant coating, so that the problems of layering and corrosion of a traditional aluminum-plastic film are solved, and the aluminum-plastic film is suitable for high-energy-density lithium battery packaging.

The invention belongs to the technical field of binding force testing, and particularly relates to a composite current collector binding force testing device and method.The composite current collector binding force testing device comprises a testing rack, a hot-pressing assembly is installed on the surface of the testing rack, and the hot-pressing assembly is used for conducting hot-pressing binding on a composite current collector three-layer composite sample; the composite current collector three-layer composite sample comprises a test main body layer, a bonding layer and a supporting layer which are sequentially stacked, a force measuring assembly is installed on one side of the hot pressing assembly, the force measuring assembly is used for testing the binding force of the composite current collector three-layer composite sample, the force measuring assembly comprises two clamps, and the two clamps are used for clamping a testing main body layer and a supporting layer of the composite current collector three-layer composite sample respectively. The three-layer composite sample of the composite current collector is subjected to hot-pressing lamination through the hot-pressing assembly, so that the bonding layer is firmly bonded with the metal layer of the test main body layer, and when a test is carried out through the force measuring mechanism, the metal layer can be completely separated, and the accuracy of binding force test data is ensured.

The invention relates to the technical field of adhesive tapes, and discloses a high-viscosity power-on viscosity-reducing adhesive tape and a preparation method thereof.The adhesive tape comprises an adhesive layer and release films attached to the two sides of the adhesive layer, the adhesive layer is prepared by adopting acrylate monomers, a carbon nano tube modification functional agent and the like as raw materials through free radical polymerization, and the release films are attached to the two sides of the adhesive layer; wherein the carbon nanotube modified functional agent is prepared by modifying a macromolecular substance with a block connection structure on the surface of a carbon nanotube, and the macromolecular substance contains an alkenyl functional group and can participate in the subsequent polymerization process of an acrylate monomer, so that the carbon nanotube is uniformly dispersed to form a continuous conductive network; compared with the prior art, the high-temperature-resistant adhesive has the advantages that the high-temperature-resistant performance of the adhesive can be improved, electrifying viscosity reduction of the adhesive is facilitated, the macromolecular substance can serve as a cross-linking agent, cohesive energy of the adhesive is improved, the adhesive performance of the adhesive can be further improved, and in addition, rigid rings and a large number of ether bonds in the structure of the macromolecular substance can effectively enhance the high-temperature-resistant performance and the adhesive performance of the adhesive.

To provide a wall material in which peeling hardly occurs in an aluminum layer attached to a refractory material, even under a high-temperature environment such as fire, at the time of handling and in the case where an external force is applied such as wind power, and which has a high heat-insulation property under a high-temperature environment, and to provide a glass curtain wall which includes the wall material.SOLUTION: In a wall material, a fireproof layer 1, an adhesive layer 5, and an aluminum composite layer 2 are laminated in this order. The aluminum composite layer 2 includes an aluminum layer 2a and a decorative layer 2c. A surface on the aluminum layer 2a side is attached to the adhesive layer 5, and a thermoplastic resin layer is not interposed between the aluminum layer 2a and the adhesive layer 5.SELECTED DRAWING: None

The invention discloses a method for industrially producing a micro-particle conductive aggregate. The method comprises the following steps: pretreating glass beads to obtain a micron-sized rough surface; preparing conductive paste containing large-particle graphene and water-based acrylic resin; at least three continuous spraying fluidized beds which are connected in series are adopted, and the surfaces of the microbeads are coated with bonding layers, conductive layers and protective layers in sequence; and finally, continuous curing and screening are carried out. According to the method, efficient, continuous and large-scale production of the conductive aggregate is achieved, and the problems that graphene is prone to agglomeration and uneven in dispersion and the coating binding force of a traditional process is poor are effectively solved. The obtained conductive aggregate is excellent in conductivity, good in solvent resistance, high in adhesive force and suitable for the fields of anti-static mortar, resin self-leveling materials, coatings and the like.

To provide an ultrasonic probe high in water resistance and chemical resistance.SOLUTION: An ultrasonic probe comprises an ultrasonic transducer (28), a metal inner housing that is thermally connected to the ultrasonic transducer (28), and a probe case for enclosing the inner housing. Bond lines (250 and 252) of the probe case and bond lines (314 and 316) of the inner housing are mutually offset in a height direction.SELECTED DRAWING: Figure 7

The invention relates to a high-moisture-resistance scratch-resistant protective film base film for a polaroid. The base film comprises a functional laminating layer, a protective film layer and a protective film layer from bottom to top, wherein the functional laminating layer comprises intercalation modified montmorillonite, graphene nanosheets, an antistatic agent and optical-grade PET (Polyethylene Terephthalate); the surface wear-resistant layer comprises wear-resistant modified PET (Polyethylene Terephthalate), functional nano filler, an ultraviolet absorbent and optical-grade PET. The functional fitting layer is in contact with a polarizer pressure-sensitive adhesive, the moisture resistance of the film is improved by combining original intercalation modified montmorillonite with a graphene nanosheet, long-acting protection is provided for a polarizer core layer, and meanwhile, an antistatic agent is introduced to ensure that no electrostatic discharge damage risk exists when the protective film is stripped; the wear-resistant layer on the outer surface improves the hardness and scratch resistance of the film through the synergistic effect of modified PET containing silicon and naphthalene ring structures and functional nanofiller; and the middle bonding layer effectively solves the problem of compatibility between the functional bonding layer and the outer surface layer, so that the stability and firmness of the multi-layer co-extrusion structure are ensured.

The application provides a rigid-flexible combination plate manufacturing method and a rigid-flexible combination plate. The rigid-flexible combination plate comprises two rigid plates, a plurality of flexible plates, an outer adhesive layer between the rigid plates and the flexible plates, and an inner adhesive layer between every two flexible plates. The method comprises the following steps: S1, flexible plate processing; S2, adhesive layer processing: respectively reserving rigid areas and flexible window areas of the outer adhesive layer and the inner adhesive layer; S3, pressing: pressing and fusing the reserved rigid areas and the flexible window areas of the outer adhesive layer and the inner adhesive layer; and S4, uncovering: milling off the rigid areas and the flexible window areas of the outer adhesive layer and the inner adhesive layer respectively or together to expose the flexible areas. After uncovering, the flexible layer part waste fused after pressing is removed together with the upper rigid waste area, so that the defects of cracking and pressing are effectively avoided, and the processing quality of the plate part is effectively ensured.

The present invention relates to a concrete zero-interval polyurethane curing and protective reinforcement material and a preparation method thereof. The reinforcement material sequentially comprises: an adhesive layer with controllable strength attenuation, a curing and protective layer, and a concrete bonding layer; the reinforcement material forms an integral body with a concrete forming steel formwork through the adhesive layer, and the joints between the adhesive layer, the curing and protective layer, and the concrete layer are mutually fused into a non-layered integral body; wherein the curing and protective layer comprises the following components by weight: 80-100 parts of a polyurethane light-curing resin, 0.2-0.8 parts of a photoinitiator, 20-25 parts of a diluent, and 3-5 parts of surface-modified nano-silicon dioxide; the concrete bonding layer comprises ultrafine magnesium oxychloride cement; the adhesive has an initial bonding strength of 1.2 MPa, capable of bonding the curing and protective layer and the concrete forming steel formwork; and over time, its bonding strength decreases to 0.05 MPa, enabling separation from the concrete forming steel formwork.

The invention discloses an expansion insulating sheet which comprises a base material and two expansion bonding layers arranged on the two sides of the base material respectively. The expansion bonding layer comprises epoxy resin with the softening point being 40 DEG C or above, a temperature-sensitive foaming agent, a curing agent, an accelerant, cellulose resin and thermoplastic resin. According to the prepared expansion insulating sheet, the bending resistance of the expansion bonding layer can be remarkably improved, and breakage caused by bending of the expansion bonding layer is avoided; in addition, the adhesiveness of the expansion bonding layers to the base material can be remarkably improved, floating of the bonding layers is avoided in the cutting process, and meanwhile stripping of the expansion bonding layers and the base material caused by mutual bonding of the expansion bonding layers in the storage process is avoided.

The invention relates to a transmission line which comprises a transmission line layer, a grounding layer and a dielectric layer clamped between the transmission line layer and the grounding layer, the dielectric layer comprises a resin layer with a plurality of hole structures, a first bonding layer and a second bonding layer, the first bonding layer is clamped between the resin layer and the transmission line layer, and the second bonding layer is clamped between the resin layer and the grounding layer. The second bonding layer is clamped between the resin layer and the grounding layer; the dielectric layer also meets the following conditions: (1) the dielectric constants of the first bonding layer and the second bonding layer are both less than or equal to 4; (2) the dielectric constant of resin adopted by the resin layer is less than or equal to 3; and (3) the volume ratio of the pore structure in the resin layer is greater than or equal to 90%. The invention also relates to a preparation method of the transmission line. The dielectric constant of the dielectric layer of the transmission line is smaller than or equal to 2, the line width of the transmission line can be kept, the bearing power of the transmission line can be improved, manufacturing is convenient, the self weight of the transmission line can be reduced, and the flexibility can be improved.

The application discloses a manufacturing method of bonded magnetic steel, comprising the following steps: 1) providing a plurality of pretreated rare earth permanent magnets, and then forming an insulating film on at least one surface to be bonded of the pretreated rare earth permanent magnets to obtain a rare earth permanent magnet with an insulating film; wherein the thickness of the insulating film formed on one surface to be bonded is 0.1-10 µm; 2) bonding the rare earth permanent magnet with the insulating film in step 1) in sequence by using a pure resin binder without a second material to obtain a bonded rare earth permanent magnet; wherein the second material is a solid insulating filler; 3) pressing and curing the bonded rare earth permanent magnet to obtain the bonded magnetic steel; wherein the thickness of the cured bonding layer formed between two adjacent rare earth permanent magnets is 8-40 µm. The method can balance the effective volume and the consistency of the interlayer resistance of the obtained bonded magnetic steel.

The invention provides a PET enhanced PE foam composite material which comprises a PE foam base material layer, a bonding layer and a PET base material layer, the bonding layer is located between the PE foam base material layer and the PET base material layer, the PE foam base material layer is made of PE foam with the density being 0.05-0.3 g / cm < 3 > and the average cell diameter being 50-200 microns, the bonding layer is made of an acrylate adhesive with the thickness being 0.01-0.05 mm, and the PET base material layer is made of a PET adhesive with the thickness being 0.01-0.05 mm. The PET base material layer adopts a transparent PET film original film with the thickness of 0.01-0.1 mm, the prepared foam composite material has excellent mechanical properties, excellent structural stability and multifunctional integration, the adopted preparation method is simple in process, controllable in operation, clear in parameters of each step and suitable for large-scale industrial production, and by accurately controlling the process parameters, the foam composite material can be used for preparing a foam composite material with good mechanical properties. And the composite material with excellent performance can be stably produced.

The present invention provides a synthetic leather based on vinyl polyolefin elastomer and a preparation method thereof, belonging to the technical fields of polyolefin and synthetic leather. The synthetic leather based on vinyl polyolefin elastomer comprises: a base fabric, an adhesive layer coated on the base fabric, and a synthetic leather layer covering the adhesive layer. Among them, by weight, the synthetic leather layer comprises: 100 parts of vinyl polyolefin elastomer, 0.01 - 5 parts of crosslinking agent, 0.01 - 5 parts of co-crosslinking agent, 0.01 - 5 parts of coupling agent; wherein, the melt index of the vinyl polyolefin elastomer is 1 - 15 g / 10 min, the number average molecular weight is 100,000 - 800,000, the molecular weight distribution index is 1.0 - 2.0, the melting point is 40°C - 90°C, the degree of branching is 30 - 120 branches / 1000 carbons, and the density is 0.860 - 0.9 g / cm 3 .

The invention relates to the technical field of coatings, and discloses a waterproof composite coating for a non-stick pan and a preparation method of the waterproof composite coating, the composite coating sequentially comprises a transition bonding layer, a waterproof blocking layer and a surface non-stick layer from inside to outside, and each layer is prepared from raw materials in a specific proportion. The transition bonding layer takes titanium carbide, potassium feldspar and the like as main raw materials, the waterproof blocking layer comprises bisphenol A epoxy resin, modified tea polyphenol and the like, and the surface non-stick layer takes polytetrafluoroethylene as a core. The preparation method sequentially comprises the steps of substrate pretreatment, transition bonding layer preparation, waterproof barrier layer preparation and surface non-sticky layer preparation, and the process is simple and controllable. The composite coating has excellent waterproof performance, firm binding force with a base body and good non-stick performance, the service life of the non-stick pan can be effectively prolonged, health risks caused by coating damage are reduced, and the composite coating is suitable for large-scale production.

The utility model provides an ultrasonic welding and bonding mechanism and a bag opening machine, and the ultrasonic welding and bonding mechanism comprises a fixed support, an ultrasonic welding and bonding mechanism and an ultrasonic welding and bonding mechanism, a sliding connection seat; the ultrasonic welding machine is fixed to the sliding connecting base and provided with a welding head which is arranged in the vertical direction and extends to the position below the sliding connecting base; the welding driving part is used for driving the sliding connecting seat to move up and down so as to enable the welding heads to be in contact with the cutting piece, and the welding driving part drives the sliding connecting seat to move downwards before bag opening processing so as to enable the welding heads to carry out welding and bonding treatment on the two sides of the preset bag opening position respectively so as to form bonding lines. During bag opening processing, a cutting piece is firstly transferred to an ultrasonic bonding mechanism, an ultrasonic welding machine is started to weld and bond the cutting piece, bonding lines are formed on the two sides of a preset bag opening position, and pre-fixation can be formed in the short edge direction of the bag opening in advance through the bonding lines, so that filler is prevented from leaking from the two ends of the bag opening, and normal processing is guaranteed; and the production applicability is improved.

Conventional removal tools have difficulty completely removing asbestos-containing adhesive layers, especially those that exist under thin paint or flooring materials. The cutting edge tends to slip on the surface of the adhesive layer, and additional sanding work is required with a sander to remove any remaining adhesive layer, resulting in poor work efficiency. [Solution] In this peeling tool, which is attached to a handheld electric impact device, the flat blade base, consisting of the base end side of the joining notch and the front side of the flat blade, is made of die steel, and the cutting edge is made of high-speed steel, allowing the cutting edge to penetrate into the concrete surface even in thin adhesive layers, enabling efficient and reliable peeling and removal of the adhesive layer. Setting the inclination angle of the cutting edge to 15° to 45° enables even more effective removal.

The present utility model discloses a composite reinforced rockwool board and a production equipment for producing same. The composite reinforced rockwool board comprises a rockwool base layer, two backing layers, two first bonding layers, a surface layer, and a second bonding layer. The two backing layers are respectively located on two outer sides of the rockwool base layer along the thickness direction. The two first bonding layers each are disposed between the two backing layers and the rockwool base layer along the thickness direction to bond the two backing layers to the rockwool base layer. The surface layer is disposed on one side of the backing layer away from the rockwool base layer. The second bonding layer is located between the surface layer and the backing layer along the thickness direction to bond the surface layer to the backing layer. The 90° peel strength between the surface layer and the backing layer ranges from 4N / 75mm to 30N / 75mm. The present utility model can improve the surface strength and integrity of the board. By bonding the surface layer on the outer surface of the backing layer, the strength of the connecting structure of the surface layer can be improved, and the surface strength of the board can be further improved, which thereby improves the service life of the board.

The utility model relates to a plastic-steel composite profile and a plastic-steel door and window. A plastic-steel composite section comprises a plastic-steel body, a metal cover and a bonding layer, the metal cover covers the plastic-steel body and is connected with the plastic-steel body in a clamped mode, a buffer cavity is formed between the metal cover and the plastic-steel body, and the bonding layer is arranged in the buffer cavity and makes contact with the plastic-steel body and the metal cover. A metal cover of the plastic-steel composite profile is connected with a plastic-steel body in a clamped mode, a buffer cavity is formed between the metal cover and the plastic-steel body, and a bonding layer is arranged in the buffer cavity and makes contact with the plastic-steel body and the metal cover so as to bond the plastic-steel body and the metal cover. The metal cover can be prevented from falling off through clamping of the metal cover and the plastic steel body and bonding of the plastic steel body and the metal cover, so that the plastic steel composite profile has good stability and reliability.

The application provides a multilayer protective film and a preparation process thereof. The structure of the multilayer protective film comprises an outer surface layer, a first adhesive layer, a support layer and a second adhesive layer arranged in sequence, wherein the support layer is a polyamide layer. The preparation process of the multilayer protective film adopts a co-extrusion process. Through the arrangement of the structure of the protective film and the reasonable compounding of the formula components, the structural strength and the heat resistance of the battery protective film are effectively improved on the basis of ensuring the safety performance and the insulation performance, the adhesive strength of the adhesive layer is improved, the protective film does not generate thermal shrinkage and thermal deformation in the use process, and the preparation process is simple and the preparation efficiency is high.

The application discloses a kind of encapsulation device and method of chip, encapsulation device includes: lead frame, plastic package, multiple chips, circuit board and tin paste;Lead frame is used to carry each chip;Plastic package is used to the plastic package of lead frame and each chip, lead frame includes base island, pin and pin dimple, base island corresponding two sides are equipped with multiple pins and the pin dimple corresponding with pin, multiple chips are pasted on base island by adhesive, multiple chips are connected pin and base island by bonding line respectively, the lower end of lead frame is connected circuit board by tin paste and forms sealed cavity, lead frame and circuit board are all equipped with through air hole, external air nozzle is communicated with sealed cavity by air hole.The three different chips of the present application are integrated in a standard DFN package, through the structure design of plastic package+base island+air hole, each chip is effectively protected, through the connection of base island and circuit board, through air nozzle to realize air tightness, the performance and stability of product are greatly improved.

An insulated wire and a preparation method therefor, a coil, and an electronic / electrical device are provided. In the preparation method, the thermoplastic polyimide is extruded to mold by adopting the extrusion process, so as to form the insulating layer on the core material, which can significantly improve the production efficiency compared to the traditional multiple-time coating process. The preparation process of the bonding layer and the extrusion process are optimized; the bonding layer is prepared by a specific bonding layer formulation; and then the insulating layer is extruded under a specific negative pressure, so that the prepared thermoplastic polyimide insulating layer has fewer bubbles, and the size of the bubbles is smaller, which ensures the insulating layer to have a higher breakdown voltage.

The present application relates to a kind of antistatic humidity regulating polyester composite fabric and its preparation method.The fabric includes polyester matrix layer, humidity regulating layer, conductive mesh layer and discrete adhesive layer from inside to outside.The humidity regulating layer is polyvinyl alcohol and polyurethane interpenetrating network porous membrane, the thickness is 15-40 μm, and its calcium chloride mass fraction and pore size increase along the film thickness direction, with good humidity regulating performance;The conductive mesh layer is woven by core-sheath type conductive filament, which enhances the antistatic performance of the fabric;Discrete adhesive layer is point-like heat-light curing acrylate adhesive, which ensures stable bonding between layers and maintains good moisture permeability.The preparation method includes freeze-thaw cycle preparation of humidity regulating layer, corona treatment of conductive mesh layer and light curing process of discrete adhesive layer.The composite fabric has excellent humidity regulating effect, antistatic performance and good wearing comfort.

The utility model discloses a splicing mechanism and an electric pole, and relates to the field of power transmission equipment, and the splicing mechanism comprises a first splicing piece, a second splicing piece, a third splicing piece and a fourth splicing piece, the second splicing piece is in plug-in connection with the plug-in port; the sealing assembly comprises a filling cavity formed between the first splicing piece and the second splicing piece and mounting grooves formed in the two sides of the filling cavity, sealing rings are arranged at the two ends of the filling cavity, and the filling cavity is filled with a bonding layer; the mounting grooves are located in the inner walls of the insertion openings. Due to the fact that the electric pole is designed in a segmented splicing mode, the electric pole can be rapidly transported to the position of a vertical pole through the unmanned aerial vehicle in a segmented transportation mode, rapid power recovery in special areas is guaranteed, and power recovery efficiency is effectively improved. After the two adjacent sections of rod bodies are spliced, the two adjacent sections of rod bodies are fixed through adhesive glue, and firmness after splicing is guaranteed. Meanwhile, through the design of a sealing ring, a glue injection hole and a glue outlet hole, the bonding glue cannot leak out from the two ends of the filling cavity during glue injection, and whether the filling cavity is full of the bonding glue or not is conveniently judged.