76results about How to "Guaranteed welding strength" patented technology

The invention relates to the field of weld joint grinding, in particular to an outer weld joint grinding device for a longitudinal submerged arc welding pipe and robot grinding equipment, and aims to relieve the technical problem that an abrasive belt is prone to excessive grinding in the related technology. The outer welding seam coping device for the longitudinal submerged arc welding pipe comprises a grinding head; the grinding head comprises a triangular fixing frame, a rotating wheel, an abutting wheel, an abrasive belt and a limiting wheel. The number of the rotating wheels is two, and the two rotating wheels and the abutting wheel are all connected with the triangular fixing frame in a pivoted mode and arranged at the corners of the triangular fixing frame respectively so as to be distributed in a triangular mode. The abrasive belt is wound and tensioned on the abutting wheel and the two rotating wheels. The two limiting wheels are arranged on the two sides of the abutting wheel respectively and connected with the triangular fixing frame in a pivoted mode, the rotating axis of each limiting wheel coincides with the rotating axis of the abutting wheel, and meanwhile the diameter of each limiting wheel is larger than that of the abutting wheel. The limiting wheels are arranged on the two sides of the abutting wheel, so that the grinding amount of the abrasive belt is limited, the welding seam strength can be ensured, and meanwhile, pipe body base metal is protected.

The invention relates to the technical field of batteries, and discloses a battery shell and a battery. The battery case includes: a case having an opening; the cover plate seals the opening to form a containing cavity, the cover plate comprises a cover plate body and a folded edge arranged on the edge of the cover plate body, the folded edge extends in the direction away from the containing cavity and is welded to the shell, a welding area is formed at the welding position of the folded edge and the shell, and in the extending direction of the folded edge, the cover plate body is located on the side, close to the containing cavity, of the welding area. In the direction perpendicular to the upper surface of the cover plate body, the distance between the side, close to the containing cavity, of the welding area and the upper surface of the cover plate body is h, the distance between the side, away from the containing cavity, of the folded edge and the side, close to the containing cavity, of the cover plate body is H, and h / H is larger than or equal to 0.17 and smaller than or equal to 0.5. The cover plate can play a buffering role, and the cover plate is prevented from being separated from the shell during thermal runaway; meanwhile, the overall height of the cover plate can be controlled, and the internal space of the shell is ensured, so that the energy density of the single battery is ensured.

The present invention relates to the field of disposable sanitary product production equipment, and specifically to a pull-up pants ultrasonic flip welding device, comprising a frame, a rotating shaft and an ultrasonic welding mechanism are mounted on the frame, the ultrasonic welding mechanism comprises a welding machine body and a pressing plate, the materials to be welded are arranged and transported in an assembly line, when the pressing plate contacts the welding machine body, the materials to be welded are sandwiched between the pressing plate and the welding machine body, the frame is provided with a flip mechanism for driving the pressing plate to approach / move away from the welding machine body, the flip mechanism comprises a groove wheel, a rotating frame, a guide rail, a slider and a connecting rod mechanism, the circumferential outer surface of the groove wheel is provided with a guide groove, the lower end of the slider is provided with a guide rod embedded in the guide groove so that the slider can be displaced as the position of the guide rod changes. The present invention is applied to the welding process of waist circumference and other positions in the production of sanitary products.

The invention relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises a cover plate main body provided with a mounting hole; the pole is arranged in the mounting hole; the riveting piece is riveted with the pole post and then is welded with the pole post; the welding joint of the pole and the riveting piece is filled with the welding filling piece, and the melting point of the welding filling piece is lower than that of the pole and that of the riveting piece. The welding filling piece is filled at the welding joint of the pole and the riveting piece, so that the pole and the riveting piece can be wrapped after the welding filling piece is heated and melted, and the welding strength of the pole and the riveting piece is ensured; the melting point of the welding filling piece is lower than that of the pole and the riveting piece, so that the welding filling piece cannot generate high temperature after being melted, the influence of thermal deformation of the riveting piece is small, the flatness of the riveting piece is effectively improved, the appearance of the welding area of the pole and the riveting piece is improved, the appearance yield of the cell cover plate is improved, and the production cost is reduced. Therefore, the safety and the yield of the battery cell are improved.

The invention discloses an aluminum alloy large-gap MIG welding method which comprises the following steps: firstly, determining the thickness position and the welding direction of a fillet weld of a to-be-welded workpiece, determining welding current according to the thickness of the to-be-welded workpiece, and continuously heating a molten pool by adopting a delay staying method in an arcing stage; s2, in the welding stage, switches of the robot and the MIG welding machine are turned on, and a MIG welding gun walking path program carried by the welding robot is compiled; an MIG welding gun carried by the robot swings in a Z shape and swings back and forth, a double-pulse scheme is adopted in the welding process specification, according to the welding current scheme, the welding current is determined according to the thickness of the aluminum alloy, the welding parameter of welding swing in the forward direction is small current, and the welding parameter of welding swing in the backward direction is large current; and after swinging of the welding gun is finished, the welding gun continuously moves for a certain distance, and the welding gun moves to a welding end point. Effective welding can be achieved under the working conditions of different thicknesses and large gaps, and the welding quality is improved.

The invention discloses an automatic feeding device with I-shaped steel paving and end cutting functions for a steel arch production line, which comprises a bundle grabbing mechanism, a first paving and conveying mechanism, an end cutting and chamfering mechanism, a second paving and conveying mechanism and a feeding mechanism, and is characterized in that the first paving and conveying mechanism grabs I-shaped steel from an I-shaped steel bundle and conveys the I-shaped steel to the first paving and conveying mechanism; i-shaped steel is paved by the first paving and conveying mechanism, end cutting and end chamfering are performed on the I-shaped steel by the end cutting and chamfering mechanism, the I-shaped steel is conveyed to the second paving and conveying mechanism, and the I-shaped steel is conveyed to a steel arch production line by the second paving and conveying mechanism. According to the device, automatic feeding of I-shaped steel bundles can be achieved one by one, the ends of the I-shaped steel can be automatically sawn, chamfers of the ends of the I-shaped steel can be automatically sawn, welding grooves can be machined in the ends of the I-shaped steel to be welded in advance, the welding quality of I-shaped steel joints is improved, the process configuration is scientific and reasonable, and the production efficiency is improved. The production efficiency of a steel arch production line is improved, and the production cost is reduced.

The invention discloses a manufacturing method of a high-speed asynchronous motor rotor. A plurality of grooves are formed in the steel side wall of the rotor; brazing filler metal is sprayed on the surface of the conducting bar to obtain a sprayed conducting bar; assembling the spraying conducting bar into the groove to form an assembly body, wherein the conducting bar protrudes out of the side wall of the rotor steel; an outer lantern ring with the expansion coefficient smaller than that of the guide strip is sleeved outside the assembly body; vacuum diffusion welding is carried out, and the outer lantern ring extrudes the conducting bar under the difference of expansion coefficients of the outer lantern ring and the conducting bar; after vacuum diffusion welding is finished, the outer lantern ring is taken out to obtain a welded body; end ring areas are machined at the two ends of the welding body; the end ring area is sleeved with an end ring, the end ring and the welding body are combined, and the end ring is connected with the guide strip. The outer sleeve is arranged outside, axial extrusion force is provided for the conducting bar at the high temperature of vacuum diffusion, so that contact pressure adjustment needed by diffusion welding is achieved, and the welding strength of the conducting bar and a rotor steel assembly face is guaranteed; and the grooves are formed in the side surfaces, so that the conducting bars can be assembled deeper, and the skin effect is reduced.

The invention discloses an assembling and welding system and method for annular pouring gate wax molds, and relates to the field of intelligent manufacturing, a second supporting piece used for supporting an annular pouring gate is arranged on the upper portion of a first supporting plate, a wax mold bracket is used for supporting the wax molds, and a first adjusting mechanism is used for enabling all first elastic ejection mechanisms to be away from or eject all the wax molds; heating parts are arranged on the inner sides of the second elastic ejection mechanisms, and the second adjusting mechanism is used for adjusting the second elastic ejection mechanisms so that the heating parts can be away from or attached to the annular pouring gate. Through cooperation of the first adjusting mechanism, the second adjusting mechanism, the linear telescopic driving component and the heating component, annular pouring gate wax mold welding can be achieved, the wax mold welding strength and weld joint consistency can be guaranteed, the problem of wax mold deformation in the manual welding process is solved, the casting percent of pass is increased, the production efficiency of tree assembling in the continuous production process is improved, and the production cost is reduced. And the device is suitable for welding annular pouring gate wax molds with different sizes, different structures and different numbers.

The utility model discloses a single battery, a battery pack and an electric device. The single battery comprises a shell, an electrode assembly, a first cover plate and a first collector plate, the first flow collecting disc comprises a connecting piece and an elastic piece; the elastic part comprises a deformation part and a conductive part, the deformation part comprises a first section and a second section which are mutually connected, one end of the first section away from the second section is connected with the connector, the second section is bent relative to the first section, and one end of the second section away from the first section is connected with the conductive part. According to the first current collecting disc, the elastic piece is arranged, so that the battery has tolerance absorption capacity when being sealed, assembled and welded, and the yield loss is reduced; the deformation part of the elastic piece comprises the first section and the second section, and the first section and the second section are bent, so that the deformation capability of the elastic piece can be improved, and the connection between the connecting piece and the electrode assembly cannot be influenced.

The invention discloses an anti-explosion scroll compressor, and relates to the technical field of scroll compressors, in particular to a scroll compressor with an anti-explosion function. An explosion-proof junction box assembly is arranged on a compressor body; a junction box of the explosion-proof junction box assembly is in circular projection welding connection with the compressor body; the left side and the lower side of the junction box are provided with cable gland mounting holes, and a cable gland A used for connecting a power cable and a cable gland B used for connecting a protector cable are assembled in the cable gland mounting holes respectively. The wiring T-shaped seat is arranged on the wiring post; a power supply cable penetrates through the cable gland A and then is connected to the wiring T-shaped seat through a bolt; the temperature protector penetrates through the cable gland B and then is placed in the junction box; and an isolation gasket is arranged on the junction box cover and is assembled and tightened with the junction box through an M5 bolt. According to the technical scheme, the problems that a conventional compressor junction box in the prior art is relatively simple in protection, poor in sealing performance, prone to sparking when making contact with metal impurities or liquid, flammable and explosive in a flammable gas environment and the like are solved.

The invention relates to the technical field of nuclear waste treatment and storage, in particular to a nuclear waste barrel steel shelf stand column mounting and adjusting tool and method. The adjusting tool comprises a rotating piece, a fixing piece and a self-locking assembly. Nut screw threads are arranged at the two ends of the rotating piece, the screwing directions of threads of the nut screw threads are opposite, and a blocking hole is formed in the groove portion of the root between every two adjacent nut screw threads. The fixing piece comprises studs and lantern rings, the studs are installed in the nut screw threads at the two ends of the rotating piece, and the lantern rings are arranged at the ends of the studs; the self-locking assembly comprises a plugging screw and a self-locking ball, the plugging screw is installed in the plugging hole, and the self-locking ball is plugged in a matched tooth groove hole of the nut screw thread and the stud. The adjusting tool can be operated by one hand, is convenient and labor-saving, can realize fine adjustment, and does not damage the upright post.

According to the main-grid-free battery string and the preparation method thereof disclosed by the invention, direct contact between a grid line and a welding strip is avoided by arranging a conducting layer, so that tin-silver alloy formed by grid line silver paste and tin on the welding strip during welding of the welding strip is avoided, the over-welding problem is reduced, and electric connection between the special-shaped grid line and the welding strip is avoided by arranging an insulating layer. Furthermore, the height of the conductive layer is larger than that of the insulating layer, so that the welding strength and the electric connection between the welding strip and the conductive layer are ensured. Or the height of the conductive layer is smaller than the height of the insulating layer by adopting a specific preparation process, and meanwhile, electric contact between the welding strip and the conductive layer is realized.

The utility model provides a patch type SQ common mode inductor which comprises a shell, a magnetic core, a first coil and a second coil, the shell comprises a groove body and four patch pins, the groove body is provided with a frame and a bottom wall, the patch pins are arranged on the outer wall face of the frame, and in the height direction of the frame, the bottom faces of the patch pins are lower than the bottom face of the bottom wall. Or the bottom surfaces of the patch pins are flush with the bottom surface of the bottom wall, the first coil and the second coil are wound on the two sides of the magnetic core respectively, the magnetic core is arranged in the groove body, the two ends of the first coil are wound on the two patch pins respectively, and the two ends of the second coil are wound on the other two patch pins respectively; the patch pin is arranged at the position lower than or flush with the bottom wall of the shell, after the inductor is placed on an electric device to be welded, a worker can weld the inductor through the patch pin, after the patch pin is wound with a coil, a gap is formed between the bottom wall of the shell and the electric device to be welded, the operable space of the corresponding patch pin is large, and therefore the inductor can be conveniently welded. And meanwhile, the welding strength is ensured, and the production efficiency of the inductor is effectively improved.

The invention discloses automobile stamping part assembling equipment, and relates to the technical field of assembling equipment, the automobile stamping part assembling equipment comprises a second U-shaped frame, a second servo motor is fixedly mounted on the second U-shaped frame, a second rotating shaft is fixedly mounted at the upper end of the second servo motor through an output shaft, and a first clamping rotating plate is fixedly mounted at the upper end of the second rotating shaft; according to the stamping part cleaning device, through the arrangement of the cleaning water tank, the water tank support, the air blower and the heating assembly, the stamping part cleaning device can effectively remove oil stains and impurities on stamping parts, the purity of a welding pool is guaranteed, and therefore the welding quality is improved; the welding strength of the outer plate and the inner plate of the engine cover is ensured, meanwhile, an oxide layer, rust and the like on the surface of a stamping part can be removed through cleaning, the cleaned metal surface is smoother, fusion during welding is facilitated, a welding seam is more uniform and compact, and the quality of a welding joint is improved.

The utility model is applicable to the technical field of welding structures, and provides a radiator end welding structure which comprises a water tank, and inclined planes are respectively arranged at side welding positions of contact surfaces of the water tank and a support plate; the two inclined surfaces form a V-shaped welding space; reinforcing ribs and guide ribs are arranged on the inclined surface; projections of the reinforcing ribs and the guide ribs on the inclined plane are arranged at a preset angle; the reinforcing ribs are symmetrically arranged by taking the V-shaped section in the middle of the V-shaped welding space as a symmetric plane, so that the influence of the roughness of the inclined plane of the V-shaped design on the strength of the welding part can be reduced, and the capability of resisting external force vertical to the V-shaped section at the welding part is improved due to the arrangement of the reinforcing ribs; and the welding strength and the stability of the welding position structure are further improved.

The invention discloses a new energy power battery standard box and a manufacturing method thereof.The new energy power battery standard box comprises a bottom plate, a front frame and a rear frame, the front frame and the rear frame are welded and assembled at the front end and the rear end of the bottom plate, and the bottom plate is provided with a main plate body, a left beam and a right beam, the front frame is provided with a front blocking plate and a front edge beam integrally formed on the upper side of the front blocking plate, the rear frame is provided with a rear blocking plate and a rear edge beam integrally formed on the upper side of the rear blocking plate, a through main channel is arranged in the main plate body, and the front blocking plate and the rear blocking plate are connected to the front end and the rear end of the main channel in a blocking mode respectively. A water inlet channel and a water outlet channel are arranged at the left end and the right end of the front blocking plate and are communicated with the main channel; the left edge beam and the right edge beam both protrude upwards relative to the main plate body, and a rectangular frame structure is defined by the front edge beam, the left edge beam, the rear edge beam and the right edge beam. The battery box has the beneficial effects that the box body assembly structure is simpler and more convenient, the sealing performance of the circulating water path in the bottom plate of the box body is good, and the safety performance of the battery box body is improved.

This utility model relates to the field of battery cell technology and discloses a novel soft-pack PACK structure, including a housing. A cover is fixedly connected to the outer wall of the housing, and a sealing ring is fixedly connected to the inner wall of the cover. A support is installed inside the housing, and an epoxy board is fixedly connected to the outer wall of the support. Copper-aluminum composite busbars are installed on the left and right outer walls of the epoxy board, with threaded rods threaded into the interior of the copper-aluminum composite busbars. An aluminum busbar is fixedly connected inside the epoxy board, and a pressure strip is provided on the outer wall of the aluminum busbar. In this utility model, the housing and cover house the battery cells to protect them from external impact damage. An epoxy board is placed on the side of the support, and then an aluminum busbar is installed inside the epoxy board. A pressure strip is then fixed to one side of the aluminum busbar, and a data acquisition line is placed between the pressure strip and the aluminum busbar. This achieves the effects of ensuring battery cell overcurrent, welding strength, and stable data acquisition.

The invention relates to the technical field of rib welding, and specifically discloses a steel box girder rib welding device, comprising a moving mechanism, a clamping mechanism and a welding mechanism, wherein the clamping mechanism comprises a lifting assembly and a plurality of clamping assemblies, wherein each clamping assembly is respectively located between adjacent ribs, and the clamping assembly comprises a connecting rod and two supporting members, wherein the two supporting members are connected to the connecting rod through a telescopic adjusting member, and the supporting members are simultaneously fitted with the ribs and the bottom plate, and a cavity is formed inside the supporting members, and an opening opposite to the ribs, the bottom plate and the connection between the supporting members is provided on the supporting members, and a cleaning mechanism is provided inside the supporting members, wherein the cleaning mechanism comprises a cleaning roller 1, a cleaning roller 2 and a dust suction assembly, wherein the cleaning roller 1 and the cleaning roller 2 are both rotatably matched with the supporting members, the cleaning roller 1 is fitted with the ribs and rotates relative to the ribs, the cleaning roller 2 is fitted with the bottom plate and rotates relative to the bottom plate, and the dust suction assembly sucks impurities inside the supporting members, and the welding device provided by the invention improves the welding quality of the ribs.

The present invention relates to the field of battery technology, and discloses a battery and a battery pack, including: a shell, at least one end of which is open; a cover plate, which is arranged corresponding to the opening to block the opening, the shell and the cover plate are enclosed to form a storage space, the cover plate is welded to the shell to form a connecting section weld and a bursting section weld, the connecting section weld and the bursting section weld are connected end to end along the circumference of the cover plate; the fusion depth of the connecting section weld is greater than the fusion depth of the bursting section weld, and / or, the fusion width of the connecting section weld is greater than the fusion width of the bursting section weld; a pole group is arranged in the storage space. In the present invention, when the battery is out of control, the cover plate can explode in the bursting section weld area, thereby quickly tearing the entire bursting section weld, and at the same time, the cover plate and the shell are kept connected at the connecting section weld, so that the cover plate can be completely flipped open, increasing the exhaust port area of ​​the battery, effectively alleviating battery out of control, and improving the safety of battery use.

The utility model discloses a spot inspection device and relates to the spot inspection device technical field, the spot inspection device is used for detecting the size of a stud welding gun, the stud welding gun comprises a guide block, a guide pipe and a chuck arranged in the guide pipe, the spot inspection device comprises a first measuring piece and a second measuring piece which are connected with each other, the end, away from the second measuring piece, of the first measuring piece is sleeved with the guide block, a mounting hole is formed in the end, away from the first measuring piece, of the second measuring piece, the end, away from the first measuring piece, of the second measuring piece is sleeved with the guide pipe, and the mounting hole is used for allowing the chuck to stretch into. When the first measuring piece can extend into the inner hole of the guide block, the inner hole of the guide block is abraded; when the second measuring piece can extend into the guide pipe and the chuck extends into the mounting hole, the guide pipe and the chuck are coaxial, namely, the guide pipe and the chuck are centered at the moment, so that the requirement of stud welding is met; therefore, the accuracy of spot inspection is greatly improved.

The utility model discloses a butt-welding terminal structure for an integral brushless motor. The butt-welding terminal structure for the integral brushless motor comprises a long butt-welding terminal structure and a short butt-welding terminal structure. According to the utility model, the long and short butt-welding terminals are matched with different winding and wire passing modes, and the hook structures of the butt-welding terminals are welded with the U-shaped bonding pads of the PCB in an embedded manner, so that the triangular parallel series connection and star parallel series connection modes of all the three-phase six-slot stator windings are realized, and the output of the motor is realized by using the tail ends of the long butt-welding terminals. Then, in consideration of the short creepage distance between the conductive part and the metal casing and the iron cover, the plastic sheath is specially designed to ensure the insulation performance. The four waist-shaped and circular vent holes on the PCB, the plastic sheath and the iron cover are matched with the groove shape of the stator lamination, so that the smoothness of the air channel in the motor is ensured.

The invention belongs to the technical field of batteries, and particularly relates to a battery pole piece and a preparation method thereof.The battery pole piece comprises a pole piece body and a tab, the pole piece body comprises a current collector and an active material layer, the current collector comprises a main body part and a welding part, and the active material layer is arranged on at least one side of the main body part in the thickness direction; the welding part comprises a main welding area and an expansion area which are connected with each other, the main welding area is arranged at the edge of the main body part, and the main body part and the main welding area are combined to form a square foil area; the expansion area protrudes out of the square foil area in the width direction of the pole piece body, the tabs are arranged on the welding parts, one part of a welding area between the tabs and the welding parts is located between the tabs and the main welding area, and the other part of the welding area is located between the tabs and the expansion area. While the welding strength of the tabs and the pole piece body is ensured, the cleaning area of the active material layer on the pole piece body is reduced, and the energy density of the battery pole piece can be improved.

The present invention discloses an automatic welding device for prefabricated building steel bars, which belongs to the technical field of steel bar welding. The device comprises: a base frame, a driving plate, a crossbeam, a support beam and a welding unit, wherein the base frame is composed of two bracket bodies arranged in parallel, the driving plates are symmetrically and slidably mounted on the base frame, a crossbeam is horizontally fixed between the driving plates, a mounting plate is symmetrically fixed on the crossbeam, a support beam is horizontally fixed between the mounting plates and located above the crossbeam, a guide groove 1 is provided on the support beam, a sliding plate is slidably connected in the guide groove 1; a mounting beam frame is transversely fixed on the side of the sliding plate away from the support beam, a plurality of welding units are arranged on the mounting beam frame, and each of the welding units is horizontally slidably adjusted and arranged on the mounting beam frame; the present invention performs two welding processes on the angle formed by the steel bar construction combination, further strengthens the construction joint, and ensures the welding strength.

The utility model discloses a laser edge banding machine for an iron frame panel lamp. The laser edge banding machine comprises a conveying rack, a material carrying device located below the conveying rack, a material distributing device, a material pressing device and a laser welding device, wherein the material distributing device, the material pressing device and the laser welding device are located above the conveying rack. The conveying rack is sequentially provided with a feeding position, a welding position and a discharging position. The material separating device is used for separating materials at the feeding position one by one and pushing the materials to the material carrying device; the material carrying device is used for carrying the separated materials from the feeding position to the welding position and carrying the welded materials from the welding position to the discharging position. The material pressing device is located below the laser welding device and used for pressing materials on the welding position. The laser welding device is used for conducting laser welding on the materials on the welding positions. According to the utility model, the welding efficiency and the yield are improved, and the perpendicularity and the welding strength of a product are ensured.

This invention relates to a welding apparatus and method for nickel wire mesh in an alkaline water hydrogen production electrolytic cell. The apparatus includes a laser welding machine, a wire feeder, and a rotating platform, as well as an adjustable support, a laser welding torch, a wire feeding nozzle, a wire feeding tube, and a mesh pressing mechanism. The laser welding machine has a built-in laser welding torch, and the wire feeder has a built-in wire feeding tube and a wire feeding nozzle. The wire feeder contains welding wire, one end of which passes through the wire feeding tube and the wire feeding nozzle before extending out. The end of the welding wire is positioned above the edge of the nickel wire mesh but does not contact it. The adjustable support houses the laser welding torch, and a connecting ring is provided between the laser welding torch and the wire feeding nozzle. The end of the laser welding torch is positioned above the welding wire, and the focal center of the laser beam emitted from the end of the laser welding torch is located on the welding wire. The adjustable support can also be adjusted to connect a mesh pressing mechanism for pressing the edge of the nickel wire mesh. This invention arranges the welding wire above the edge of the nickel wire mesh, and the welding wire melts and drips onto the edge of the nickel wire mesh when heated, facilitating welding without melting the nickel wire mesh.

The invention belongs to the technical field of batteries, and particularly relates to a battery pole piece and a preparation method thereof.The battery pole piece comprises a pole piece body, the pole piece body comprises a current collector and an active material layer, the current collector comprises a main body part and an expansion part, and the active material layer is arranged on at least one side of the main body part in the thickness direction; the main body part is provided with an expansion part, the expansion part protrudes out of the main body part in the width direction of the current collector, the tab comprises an external connection part and a welding part which are connected, the welding part is arranged on the expansion part, and the width of the welding part in the length direction of the current collector is different from the width of the external connection part in the length direction of the current collector. According to the battery pole piece, the active material layer on the pole piece body does not need to be cleaned while the welding strength between the tab and the expansion part is ensured, so that the loss of the active material layer is avoided, and the energy density of the battery pole piece is improved.

The utility model relates to the technical field of grating steel frame machining, in particular to a grating steel frame machining welding quality control device which comprises an arc-shaped bearing table, at least three supporting columns used for supporting main ribs are distributed in the middle of the arc-shaped bearing table at equal intervals, and control plates are arranged at the two ends of the arc-shaped bearing table respectively. The arc-shaped bearing table is sleeved with the supporting column and the control panel through C-shaped sleeve pieces, two supporting rods extending forwards are arranged on the front side of the supporting column from top to bottom in a spaced mode, two limiting pieces are arranged in the length direction of the supporting rods in a spaced mode, the main ribs are clamped in the limiting pieces, and two positioning rods are arranged on the upper side and the lower side of the end face of the inner side of the control panel at equal intervals respectively. The positioning rods on the upper side and the lower side are sleeved with angle iron correspondingly, the end of the main rib abuts against the angle iron, and the problems that according to a grating steel frame machining and welding device in the prior art, the welding quality cannot be guaranteed due to the fact that the welding quality cannot be effectively controlled, the welding process is tedious, time and labor are wasted, and the machining efficiency cannot be improved are solved.

This invention provides a welding device for foundation pit retaining construction, relating to the field of foundation pit reinforcement mesh welding technology. It includes a welding clamp with a welding section mounted on it. The welding section is used to improve the lap joint accuracy of the reinforcing bar ends. A vertical reinforcement limiting component is mounted on the welding section, which limits the spacing of the vertical reinforcement bars. An anti-bending support is mounted on the welding clamp. A lower weld protection component is mounted on the welding section. Welding guides are mounted on the welding clamp and the welding section. This addresses the problems of current foundation pit retaining construction welding devices, which make it inconvenient for workers to first clamp the horizontal reinforcing bar ends before performing double-sided welding, and also make it inconvenient to check the lap joint accuracy of the horizontal reinforcing bar ends.

The present invention relates to the field of battery technology, and discloses a battery shell, a battery and a battery pack, including: a main body; an explosion-proof valve, which is welded with the main body to form a connecting section weld and a bursting section weld, wherein the connecting section weld and the bursting section weld are connected end to end along the circumference of the explosion-proof valve; the melting depth of the connecting section weld is greater than the melting depth of the bursting section weld, and / or the melting width of the connecting section weld is greater than the melting width of the bursting section weld. According to the present invention, when the battery is out of control, the explosion-proof valve can explode in the bursting section weld area, thereby quickly tearing the entire bursting section weld, while keeping the explosion-proof valve and the main body connected at the connecting section weld, so that the explosion-proof valve can be fully opened, increasing the exhaust port area of ​​the battery, effectively alleviating the battery out of control, and improving the safety of battery use; and, there is no need to punch additional notches on the explosion-proof valve, thereby avoiding the problem of cracking at the notch when the explosion-proof valve is subjected to force, and avoiding leakage of the battery.

The steel pipe truss comprises a concrete prefabricated bottom plate (1) and an upper chord steel pipe (2), the left side and the right side of the upper chord steel pipe (2) are each in an arc shape, the upper ends of the arcs on the left side and the right side are connected to form an upper straight line section, the lower ends of the arcs on the left side and the right side are connected to form a lower straight line section, and the lengths of the upper straight line section and the lower straight line section are both 15-80 mm; the prefabricated concrete bottom plate further comprises a web member (3), the web member (3) is formed by continuously bending a hollow steel pipe into a wave shape, the wave crest of the wave-shaped web member (3) is welded to the bottom face of the lower linear section of the upper chord steel pipe (2), and the wave trough part of the wave-shaped web member (3) is buried in the prefabricated concrete bottom plate (1). The hollow web member is creatively welded with the straight section at the bottom of the upper chord steel pipe, and the thickness of the steel plate at the lower straight section of the upper chord steel pipe is increased, so that the defect can be better avoided, and the welding strength is ensured.