42 results about "Fusion joints" patented technology

The utility model discloses a cable fusion joint, which comprises a pair of cables and a fusion welding section between the pair of cables, a pair of cable bodies are fixedly sleeved with conical fixing sleeves, the outer wall of each conical fixing sleeve is provided with an annular groove along the circumferential direction, and a sealing gasket with the same taper as the conical fixing sleeve is embedded in each annular groove. The utility model relates to the technical field of cable welding, the conical fixing sleeves are matched with the sealing gaskets, and the first connectors, the second connectors and the conical fixing sleeves are tightly connected, so that a plurality of groups of sealing structures are formed, and the sealing performance of the cable is improved. The sealing gasket and the conical fixing sleeve are the same in taper and can be tightly attached, and water is effectively prevented from entering. And the first connecting ring and the second connecting ring are screwed through threads, so that the sealing effect is enhanced, and the waterproof performance of the cable welding section is ensured.

The electric fusion joint according to the design is a 45-degree elbow-type pipe joint made of synthetic resin. A socket is formed at each end of the curved pipe section to receive the pipe end of another pipe member. Each socket is formed as an electric fusion joint (EF joint section), and an electric heating wire is embedded in its inner surface. The protrusions on the upper surface of the tip of each socket are terminal sections connected to the electric heating wire. The small protrusions on the inside of each terminal section are indicators to show that the inner surface of the socket and the outer surface of the other pipe member have been fused. A half-split clamp section is connected to the tip of the socket. Furthermore, a pedestal section is formed on the bottom surfaces of the curved pipe section and the socket.

To provide an electric fusion joint capable of preventing occurrence of a kink even in a heating wire of which diameter is thin.SOLUTION: An electric fusion joint 1 includes a cylindrical part 11, a stopper part 12, side heating wires 31, 32 and a stopper heating wire 33. The cylindrical part 11 has joint socket parts 21, 22 into which a pipe including thermoplastic resin is inserted. The stopper part 12 is disposed on an inner surface of the cylindrical part 11 to expose inwardly, and when resin pipes 2, 3 are inserted to the inner sides of the joint socket parts 21, 22, regulates insertion positions of pipe ends of the resin pipes 2, 3. The side heating wires 31, 32 are disposed in the joint socket parts 21, 22. The stopper heating wire 33 is disposed in the stopper part 12. An angle in the circumferential direction between a first branch point P1 from the stopper heating wire 33 to the side heating wire 31 and a second branch point P2 from the side heating wire 31 to a pin 41b is in a range between -30° or larger and +30° or smaller.SELECTED DRAWING: Figure 4

Provided is a rotary fusion joint for piping that connects dissimilar pipes, such as resin piping components and metal piping components, which ensures workability at the construction site, distributes bending loads acting on the connection, and maintains liquid-tightness and durability over the long term. [Solution] A rotary fusion joint for piping (100) comprises a resin heat fusion joint (10), a threaded metal connector (20), and a metal incore (30). A first angled protrusion (10c) is formed on the outer peripheral wall of the other end of the heat fusion joint (10), and engages with a second angled protrusion (20b) formed on the inner peripheral wall of the threaded metal connector (20), thereby connecting the two so that they cannot be removed axially and can rotate freely relative to each other. The metal incore (30) is housed across the internal passages (10a, 20a) of the heat fusion joint (10) and the threaded metal connector (20), and is sealed and maintained at both ends via first and second water stop rings (30b, 30c).

The utility model relates to a novel cable fusion joint die, including upper die and lower die, the upper die is detachably connected with lower die, the top of lower die designs as the taper surface, the bottom of upper die matches the taper surface design is concave surface, the plane of taper surface and concave surface contact is provided with semicircular groove, two the semicircular groove is folded and forms forming cavity, the both ends of forming cavity pass through line hole and communicate with outside, the upper die and lower die inner ring around semicircular groove are provided with heat insulating ring, the upper die is detachably installed with flow guide hopper, the flow channel of flow guide hopper penetrates heat insulating ring and communicates with forming cavity.In the upper die and lower die integration heat insulating ring, utilize heat insulating ring to insulate the most heat that fusion joint in forming cavity outward conduction when, make maintenance personnel after forming, can more conveniently detach the upper die and lower die, avoid scald.

The application relates to a kind of in-service polyethylene pipeline electric fusion joint service life nondestructive evaluation methods, comprising: the corresponding relationship between the heat affected zone edge width of polyethylene pipeline electric fusion joint welding area and service life is established in advance in laboratory;Ultrasonic phased array detection is carried out on the in-service polyethylene pipeline electric fusion joint to be evaluated in the field, and the heat affected zone edge width da of the in-service polyethylene pipeline electric fusion joint welding area is obtained;The heat affected zone edge width da is substituted into the corresponding relationship, and the service life tfa of the in-service polyethylene pipeline electric fusion joint is obtained.The application also relates to a corresponding evaluation system, including ultrasonic self-focusing linear array probe and host computer equipped with data analysis software.The method and evaluation system of the application can realize the rapid and nondestructive evaluation of the service life of city buried polyethylene pipeline electric fusion joint.

To provide a method of fusion joint that joins different types of metal plates having a large difference in melting point with high rigidity force.SOLUTION: A method of fusion joint includes the steps of: providing a steel plate 50 with a taper hole 211 and a lead plate 51 having a melting point that is lower than that of the steel plate 50, where the taper hole 211 is a hole of which diameter increases toward a non-contact surface from a contact surface where the steel plate 50 and the lead plate 51 come into contact with each other at mutual surfaces; putting a metal piece 209 containing the same component as the lead plate 51 into the taper hole 211; and irradiating the taper hole 211 with a laser beam 225 to fuse and solidify the metal piece 209, thereby joining the lead plate 51 to the steel plate 50 via the taper hole 211.SELECTED DRAWING: Figure 1

The present application relates to a method and equipment for making a hole-containing cold-proof cloth, which provides a non-woven cloth and a reinforcing sheet on a production line; then the reinforcing sheet and the corresponding side edge of the non-woven cloth are laminated and adhered together through a fusion joint formed by ultrasonic heat sealing, to form a multi-layer structure of a hole-containing area; then holes are formed on the hole-containing area through a machine to obtain fixed holes with a certain interval distance, the fixed holes penetrating through the upper and lower sides in the laminating direction of the hole-containing area; the non-woven cloth with the fixed holes is stored to obtain a hole-containing cold-proof cloth for standby. The non-woven cloth has good air permeability, sun protection, cold-proof and insect and bird prevention effects. The hole-containing area not only enhances the edge structural property of the cold-proof cloth and improves the tensile and tear resistance of the cold-proof cloth, but also meets the requirement of forming the tensile fixed holes on the hole-containing area through a mechanical device, facilitates the use and fixation of the cold-proof cloth, and is stable in combination with plants and not easy to be blown away by the wind, thereby improving the protection effect. The production equipment can realize continuous production of the hole-containing cold-proof cloth, has a simple structure and low investment cost.

The invention discloses a waterproof cable middle welding head which comprises a conductor connector, an inner semi-conductive layer, an inner insulating layer, an outer semi-conductive layer, a shielding layer, an outer insulating layer, a grounding wire, a waterproof belt, a waterproof heat-shrinkable sleeve and an aramid fiber armoring belt. Double waterproofing is achieved through the two layers of waterproof belts and the waterproof heat-shrinkable sleeve, all functional layers are completely recovered to guarantee electrical safety, protection is enhanced through the aramid fiber armoring belt, construction is convenient and fast, the adaptation scene range is wide, severe environment can be resisted for a long time, and the service life of the cable connector is prolonged.

The invention discloses a 10KV power cable welding head preparation method with a voltage control function, and the method comprises the following steps: carrying out the pretreatment of the welding ends of two pre-welded cables, and then welding the conductors of the two welding ends to form a welding head; winding a conductor shielding layer tape on the peripheral side of the conductor, then winding an insulating tape on an insulating layer to-be-recovered area of the welding head, and sleeving a shaping sleeve on the peripheral side of the insulating tape; a pressure sensing assembly is placed on the peripheral side of the shaping sleeve, and then a flexible wrapping tape is wound on the peripheral side of the pressure sensing assembly and the peripheral side of the shaping sleeve; a flexible temperature control heater is wound on the peripheral side of the flexible wrapping tape, and a heat preservation layer is wrapped outside the flexible temperature control heater; heating to a first preset temperature, and then raising the temperature to a second preset temperature; and after cooling, processing the insulating tape in the to-be-recovered area of the insulating layer, and winding a shielding layer self-adhesive tape on the peripheral side of the insulating tape to form an outer shielding layer. Pressure data can be fed back in real time, and pressure controllability during welding is achieved.

The utility model discloses an optical fiber fusion splicer, which comprises a base body and two groups of fixing mechanisms, the top of the base body is provided with a linear sliding chute, a pair of sliding seats are embedded in the sliding chute in a sliding manner, the two sliding seats can be close to or far away from each other, and a pair of fusion splicing heads are oppositely arranged in the middle of the chute wall in the width direction of the sliding chute; the fixing mechanisms correspond to the sliding seats in a one-to-one mode, each fixing mechanism comprises a pair of clamping seats and a plurality of pairs of hydraulic cylinders, and the pair of clamping seats are oppositely arranged on the two sides of the sliding groove in the width direction and connected with the sliding seats through the hydraulic cylinders so that the two clamping seats can be close to each other; the clamping surfaces of the clamping seats are inclined surfaces, so that a V-shaped clamping groove is formed between the pair of clamping seats, and a pressing plate is horizontally arranged at the tops of the clamping seats. The clamping mechanism can solve the problem that a clamping mechanism of an existing optical fiber fusion splicer cannot ensure that two optical fibers to be fused can be adjusted to be in a coaxial state.

The application relates to the technical field of optical fiber manufacturing equipment, and discloses a fusion splicer for optical fiber manufacturing, which comprises a fusion splicer body, the upper surface of the fusion splicer body is fixedly connected with a guide mechanism, the upper surface of the fusion splicer body is clamped with a protective shell, the upper surface of the fusion splicer body is fixedly connected with a melting device and a clamping device, and the side surface of the fusion splicer body is fixedly connected with a damping mechanism. Through the setting of a semicircular cylinder, extrusion of the two semicircular heat-shrinkable tubes is realized, the two semicircular heat-shrinkable tubes are tightly attached, and the fusion joint is completely sealed; the two air bags flexibly clamp the optical fiber, rigid damage is avoided, the optical fiber is clamped with the heating box one by the semicircular heat-shrinkable tube two, and the external force influence on the fusion joint is reduced; the synchronous bending rod connects the two side push plates, synchronous movement is ensured, and the optical fiber is prevented from being unevenly stressed; the rough surface plate is rubbed with the fuselage, the sliding rod one is damped to slide, the speed of the optical fiber when moving above the heating box one is prevented from being too large, and the impact is reduced.

The present invention discloses an optical fiber fusion splicer, which includes a frame body. Four grooves are provided at the top of the frame body. Through the mutual cooperation among structures such as a magnifying glass, a fusion joint, a limiting ring, and a Z-shaped plate, it is possible to move the cover plate upward, limit the cover plate through a threaded rod and a vertical rod, and then place the processed optical fiber in the groove inside the limiting ring. Five optical fibers can be placed at a time, which means that after two of the optical fibers are fused, by rotating the limiting ring, the optical fibers in the adjacent grooves can be aligned with the fusion joint to facilitate continuous fusion. The operator can choose to use a horizontal or vertical fusion joint for work according to his own habit. If a horizontal fusion joint is used, first move the limiting plate downward. The limiting plate drives the limiting elastic rod to move inside the V-shaped tube, and the Z-shaped plate can jack up the adjacent fusion joint. By rotating the screw into the adjacent threaded hole, the position of the fusion joint can be limited.

The utility model discloses a horizontal optical cable splicing box, including box body, box cover and fusion fiber tray, the rear side of box cover and box body hinge, and be provided with support column and fixed column in the box body, fusion fiber tray is provided with multiple groups, and the rear side of multiple fusion fiber trays is hinged in proper order, and the lowermost fusion fiber tray is set up on the support column, and is connected with the fixed column, and the uppermost fusion fiber tray cover is equipped with the apron, is provided with a plurality of fusion joint slot on the fusion fiber tray, and the inner wall distribution of fusion fiber tray is provided with a plurality of card position, and the top cover of adjacent fusion fiber tray is equipped with the baffle, when multiple fusion fiber trays are stacked, can be bound by the ribbon. The utility model discloses horizontal optical cable splicing box, through the hinge between box cover and box body, and the hinge between multiple fusion joint trays, can be convenient for the fusion of optical fiber, the coiling of optical fiber redundancy and wiring operation, and through multiple fusion joint trays can fuse more optical fiber, to improve the core number, and through the baffle and ribbon can ensure the fusion stability in multiple fusion joint trays.

The utility model discloses a cable middle welding head, comprising a connection mounting plate, a fixed through groove is arranged in the connection mounting plate, the inner side of the fixed through groove is movably connected with a bidirectional threaded rod, and the outer side of the surface of the bidirectional threaded rod is movably sleeved with a movable mounting block. A connecting mounting block is fixedly connected to the front surface of the movable mounting block, a driven bevel gear is fixedly connected to one end of a bidirectional threaded rod, and a connecting driving adjusting mechanism is fixedly connected to one side of a connecting mounting plate. According to the cable intermediate welding head, through arrangement of the connection driving adjusting mechanism, a driven bevel gear and a bidirectional threaded rod can be stably driven in the use process, and meanwhile, the connection driving adjusting mechanism can be rapidly disassembled; according to the connecting driving adjusting mechanism, different connecting mounting plates can be connected for use, the overall use cost is reduced, use is convenient, and an operator can operate and adjust the connecting driving adjusting mechanism conveniently.

The soft package battery heat sealing structure and heat sealing equipment of the present application relate to the soft package battery processing technical field, and the soft package battery heat sealing structure comprises an upper sealing assembly and a lower sealing assembly, the upper sealing assembly is provided with a first flange, part of the first flange defines a position avoiding groove for accommodating the battery cell on the upper sealing assembly; the lower sealing assembly is provided with a second flange, part of the second flange defines a profiled groove for accommodating the battery cell on the lower sealing assembly; when the upper sealing assembly and the lower sealing assembly are close to each other, the first fusion joint line and the second fusion joint line can be respectively fused out before and after the battery is turned over, the two fusion joint lines intersect or partially overlap, and the receiving cavity with the liquid injection port is heat sealed around the battery cell on the heat fusion shell; in this way, the first heat sealing process can be completed by setting a single heat sealing die, which is conducive to the expansion of the production scale; the production and manufacturing cost is reduced, and the production and processing efficiency can be effectively improved.

To provide an electric fusion joint capable of preventing a joint body and a fusion part of a resin pipe with an outer layer to be connected from deteriorating due to ultraviolet rays or the like, and capable of being easily manufactured.SOLUTION: An electric fusion joint 10 comprises a joint body 12 having an electric fusion socket 20. The joint body comprises an inner layer 12a, and a weather-resistant outer layer 12b that covers an outer peripheral surface of the inner layer. The electric fusion joint also comprises a cylindrical protective cover 14 having weather resistance and attached to an outer peripheral surface of the electric fusion socket so that one end part protrudes axially from an open end of the electric fusion socket.SELECTED DRAWING: Figure 2

To provide rehabilitation piping capable of rehabilitating existing piping that is difficult to replace by excavation due to its on-site installation condition.SOLUTION: Rehabilitation piping of the present invention is rehabilitation piping for rehabilitating existing piping installed underground or under a structure, the rehabilitation piping housed inside the existing piping and comprising a plurality of resin pipes made of polyolefin resin and an electric fusion joint extending and joining the plurality of resin pipes. It is preferable that the rehabilitation piping of the present invention has a diameter reduction rate expressed by the relation (outer diameter of the resin pipe / inner diameter of the existing piping) of 35% or less.SELECTED DRAWING: Figure 1

To surely connect a heating wire and a terminal pin in an electric fusion joint.SOLUTION: An electro-fusion fitting is an electro-fusion fitting including a fusion portion in which a heating wire 300 is inserted into a cutout groove formed in a spiral shape on an inner peripheral surface of a thermoplastic resin pipe into which a resin pipe to be connected is inserted, the electro-fusion fitting including a conductive terminal pin 2500 having a substantially columnar shape for supplying electricity from an external power supply to the heating wire 300, the terminal pin being provided in a through-hole drilled so as to reach the heating wire 300 from an outer peripheral surface of the thermoplastic resin pipe. The lower side (substantially cylindrical part 2530) connected to the heating wire 300 in the terminal pin 2500 has a different shape corresponding to the type of the heating wire 300, and the difference in shape can be visually distinguished from the outer peripheral surface of the thermoplastic resin tube.SELECTED DRAWING: Figure 6

The utility model relates to the technical field of pipeline welding, and discloses a pipeline hot melting joint device for hydraulic engineering, which comprises a base, the top of the base is fixedly connected with a connecting seat, and the top of the base is provided with a hot melting component. According to the pipeline hot melting joint device for the water conservancy project, pipelines are firmly fixed by the clamping seats all the time, position deviation is avoided in the whole process, the centering precision of the two pipelines is ensured, the pipelines do not need to be exposed in air for a long time after being heated, but are directly in butt joint under guiding of the sliding rails, heat loss is greatly reduced, and the service life of the pipelines is prolonged. The surface of a fusion layer is prevented from being cooled too early, sufficient molecular diffusion is ensured, the welding strength and quality are improved, accurate butt joint of the two ends is ensured, when the clamping bases on the two sides move oppositely, the hot melting connector body rotates, two sets of pipelines are close to each other and are in butt joint, manual operation steps are reduced, and the construction efficiency is improved.

This invention discloses an intermediate fusion joint for power cables, an integration method, and an online monitoring system. The joint comprises a conductor fusion connection portion, an insulation regeneration layer, and a metal shielding sleeve. The conductor fusion connection portion forms a fusion connection at the junction of two cable cores. The insulation regeneration layer covers the outside of the conductor fusion connection portion and includes a semi-conductive inner shielding portion, an insulating portion, and an outer shielding portion arranged sequentially from the inside out. The metal shielding sleeve covers the outside of the insulation regeneration layer, forming electromagnetic shielding and, together with the outer shielding portion, constituting the shielding structure of the joint area. This allows for the integrated restoration of conductor connection, electric field control, and shielding continuity in the joint area, ensuring stable electrical connection and insulation during long-term operation. This improves the withstand voltage stability and lifespan consistency of the intermediate joint under long-term load, temperature rise changes, and environmental fluctuations.

The application discloses an oil-resistant rubber rope joint forming device, and relates to the technical field of vulcanizing machines.The oil-resistant rubber rope joint forming device comprises a control box, a power supply system and a temperature control system are arranged in the control box, the power supply system is electrically connected with the temperature control system, a supporting frame is arranged at the upper end of the control box, a fusion joint mechanism is arranged on the supporting frame, and a positioning mechanism is arranged beside the fusion joint mechanism on the control box; the fusion joint mechanism comprises an upper heating module and a lower heating module; the upper heating module is fixedly connected to the supporting frame through a support; the lower heating module is fixedly installed on the control box below the upper heating module; and the upper heating module and the lower heating module are electrically connected with the temperature control system. The oil-resistant rubber rope joint forming device can be fixedly installed on the control box through the fusion joint mechanism, the temperature control system and the power supply system are arranged in the control box, the vulcanizing machine and the controller are highly integrated, and a compact and portable integrated machine is formed.

To provide an electric fusion joint which can improve moldability and can reduce the cost.SOLUTION: An electric fusion joint 1 to be fused to tubes 11, 12 containing thermoplastic resin includes a joint body 2, and heating wires 31, 41. The joint body 2 contains thermoplastic resin. The heating wires 31, 41 are arranged in the joint body 2. The joint body 2 has heating wire arrangement portions 21a, 22a in which the heating wires 31, 41 are arranged along a circumferential direction C. When a thickness of the heating wire arrangement portions 21a, 22a is T1 and a diameter of the heating wires 31, 41 is d, the relation of 0.049≤d / T1<0.34 is satisfied.SELECTED DRAWING: Figure 2

To provide a stretchable sheet that achieves both elasticity and flexibility. [Solution] The expandable sheet 1 comprises a first sheet 2, a second sheet 3, and a plurality of elastic members 4 arranged to be expandable and contractible between the two sheets 2 and 3. The plurality of elastic members 4 are arranged to extend in one direction X without intersecting each other. The first sheet 2 and the second sheet 3 are intermittently fused together at a plurality of fusion joints 10. The plurality of elastic members 4 and the first sheet 2 are joined together by a predetermined joining means. The plurality of elastic members 4 and the second sheet 3 are fused together only at positions that overlap with the fusion joints 10 in a plan view of the expandable sheet 1.

The present invention discloses a heating device and method for a deformation-proof and uniformly heated cable fusion joint. The present invention relates to the technical field of heating cable fusion joints. A positioning mechanism for positioning the cable fusion joint and a clamping mechanism for clamping the cable fusion joint are provided on a backing plate; a left heating mechanism and a right heating mechanism for uniformly heating two cables respectively are further provided on the backing plate. The left heating mechanism and the right heating mechanism are respectively located on the left and right sides of the positioning mechanism. The right heating mechanism includes a column fixed on the backing plate and a double-acting oil cylinder longitudinally arranged on the top surface of the column. Connection frames are fixed on the two piston rods of the double-acting oil cylinder, and heating molds are welded on the left ends of the two connection frames. The beneficial effects of the present invention are: it can uniformly heat two cables and greatly improve the fusion quality of the cable fusion joint and the cable.

To provide a fusing method capable of preventing the occurrence of a kink even in electric heating wires with thin wire diameters.SOLUTION: The fusing method for fusing an electric fusion joint 1 and resin pipes 2 and 3, includes step S1, step S5, and step S6. Step S1 inserts the pipes into the inside of joint receiving portions 21 and 22 of the electric fusion joint 1. Step S5 energizes electric heating wires 31 to 33 of heating sections 13 to 15. Step S6 energizes the electric heating wires 31 to 33 of the heating sections 13 to 15 after step S5. The total heat value of step S5 is 0.14 or more and 0.70 or less of the total heat value of step S5 and step S6 combined, and an average value of Joule heat generated per second is less than 184 W when only a time of substantial heating in step S5 is calculated.SELECTED DRAWING: Figure 9

The utility model belongs to the technical field of cable welding, and discloses a quick positioning device for a cable welding head, which comprises a supporting base, a fixed plate is arranged at the top end of the supporting base in a reciprocating sliding manner, a groove is formed in the fixed plate, a toothed plate is arranged in the groove in a reciprocating sliding manner, and a gear is arranged on the outer side of the toothed plate in a meshing manner. A triangular plate is fixedly arranged at the top end of the toothed plate, a connecting plate is fixedly arranged at the top end of the triangular plate, a first limiting wheel is fixedly arranged at the top end of the connecting plate, a sliding groove is formed in the top end of the supporting base, a threaded rod is rotationally arranged in the sliding groove, a sliding block spirally sleeves the outer side of the threaded rod, and the top end of the sliding block is fixedly connected with the bottom end of a fixing plate; by means of the scheme, the problems that in the using process, when the welding process is found, the circle center of a cable needs to be manually calibrated and positioned, a large amount of time and energy of workers are wasted, and the working efficiency of the workers is reduced are solved.

To enhance fatigue strength of a welding holder to enable quality control of the welding holder.SOLUTION: A welding holder comprises a base material 15 extending in a circumferential direction, and a welding portion 13 where one end and the other end of the base material are joined to each other by welding, where the welding holder holds rollers with a plurality of pockets formed in the base material at intervals in the circumferential direction. The welding portion includes a fused junction part 13a on one side in a radial direction and a diffused junction part 13b on the other side in the radial direction. A radial dimension of the fused junction part is 70% or more and 95% or less of a radial dimension of the welding portion.SELECTED DRAWING: Figure 7

According to the balloon catheter and the manufacturing method thereof, in the structure of the balloon catheter, the near end of a metal net extends to the position between a welding sleeve and a near-end pin, and welding heat generated when the near end of the metal net is welded can enable at least part of an outer covering layer, the near-end pin and at least part of the welding sleeve to be fused to form a fusion body; and the near end of the metal net is embedded and fixed in the welding body so as to realize welding and fixing. Meanwhile, due to the fact that the inner-layer pipe body of the connecting pipe is made of the thermosetting materials, the inner-layer pipe body cannot deform or collapse when being heated during welding, and therefore the inner-layer pipe body can provide radial support for the welding position of the outer covering layer, the near-end pipe pin and the welding sleeve on the inner side so as to achieve the same supporting effect as an inserted mandrel.

The utility model relates to the field of welding devices for communication cables, and discloses a welding device for communication cables, which comprises a welding box, a controller is fixedly connected to the front end of the outside of the welding box, a welding port is fixedly connected to the top end of the outside of the welding box, and limiting grooves are formed in the left side and the right side of the top end of the welding box. Rotating rods are rotationally connected to the left side and the right side of the exterior of the welding box, protruding blocks are fixedly connected to the front ends of the exteriors of the rotating rods, bearing columns are rotationally connected to the exteriors of the rotating rods, transmission rods are rotationally connected to the interiors of the bearing columns, and first springs are fixedly connected to the exteriors of the transmission rods. According to the utility model, the sealing cover can effectively prevent impurities such as dust, particles and the like in air from entering key parts of the welding device, during welding operation, the welding part of the cable is kept clean, and the problems of signal scattering, loss increase and the like caused by impurity mixing are reduced, so that the welding quality is improved.