56984 results about "Screw thread" patented technology

A stop for use with an electric drill bit, the stop having at least one threaded sleeve for positioning the stop relative to a surface into which the drill bit will extend. The stop may have both an inner and an outer sleeve. The sleeves are mounted coaxially, one inside the other about the drill bit. One of the sleeves, preferably the inner sleeve, provides coarse adjustment of the position of the shoulder relative to the tip of the bit, while the other, preferably the outer sleeve, provides fine adjustment of the position of the shoulder relative to the top of the bit.

The invention discloses horizontal internal thread tapping equipment, which relates to the technical field of tapping equipment and comprises a main body, a hydraulic mechanism, a clamping, lifting and overturning mechanism, a tapping mechanism, a liquid supply mechanism and a cooling and lubricating mechanism. Through workpiece overturning and tapping direction optimization, the problem of scrap accumulation in traditional tapping is thoroughly solved, when a hydraulic mechanism is used for driving a clamping, lifting and overturning mechanism to descend, an overturning gear is meshed with a toothed plate to drive a workpiece to overturn by 180 degrees, the bottom-to-top tapping action of a screw tap is matched, scraps naturally fall by means of the gravity effect, and the tapping efficiency is improved. Meanwhile, chippings are further scoured through precise spraying of the cooling lubricating liquid, the chippings are prevented from being retained on the surface of the threaded hole or the screw tap, by means of the design, the additional friction resistance of the chippings to the screw tap is reduced, the abrasion and fracture risks of the screw tap are reduced (the service life is prolonged by 30% or above), the problems of thread disorder, size out-of-tolerance and the like caused by chipping extrusion are solved, and the service life of the screw tap is prolonged. The thread machining precision and the surface quality are remarkably improved, and the workpiece rejection rate is reduced.

Studs, assemblies, and related methods may provide enhanced reliability of connections between components in high-power pumps. A stud may include a stud body having an anchor end positioned to be threadedly engaged with a fluid end block, and a fastener end positioned to be threadedly engaged with a fastener, thereby to secure the component and the fluid end block to one another. The stud body may include external anchor threads at the anchor end of the stud body having a buttress thread form, thereby to secure the anchor end of the stud body to the fluid end block. The stud body also may include external fastener threads at the fastener end of the stud body, and the external fastener threads may have a thread form different than the external anchor threads of the anchor end of the stud body.

The utility model discloses a hub spinning machine which comprises a processing chamber and a hub blank, two opposite sides of the inner wall of the processing chamber are respectively provided with a rough rotary knife and a fine rotary knife, the bottom end of the processing chamber is provided with a piece jacking mechanism and a deviation rectifying mechanism, the top end of the processing chamber is provided with an opposite jacking mechanism, and the opposite jacking mechanism comprises a piece jacking block. The machined part top seat is located in the containing ring, the hub blank is located between the part ejecting block and the machined part top seat, the upper end of the machined part top seat is in the shape of a circular truncated cone, it can be guaranteed that the angle of the hub blank does not deflect when the hub blank is machined, and the yield of finished hub products is increased. The clamping connection is formed by the pressing block and the clamping groove, the power threaded rod and the fixing plate are rotationally connected, the power threaded rod and the meshing threaded rod are connected in a meshing mode, and the meshing threaded rod and the sliding sleeve are rotationally connected, so that it can be guaranteed that a hub blank is stable and does not shake during machining, and the machining quality is guaranteed; and the device can adapt to hub blanks of different models.

The invention discloses a spacer for separating adjacent bare conductors, and belongs to the technical field of spacer installation, the spacer comprises a spacer and locking mechanisms installed at two ends of the spacer and used for respectively locking the adjacent bare conductors, each locking mechanism comprises a fixed clamp and a movable clamp, a lead-in port is formed between the fixed clamp and the movable clamp, and the lead-in port is communicated with the fixed clamp and the movable clamp. The top of the fixed clamp is a base, the movable clamp is movably arranged on one side of the base, the movable clamp has a rotating stroke and a horizontal sliding stroke relative to the fixed clamp, and the movable clamp has a horizontal state perpendicular to the fixed clamp and a vertical state aligned with the fixed clamp in the rotating stroke; a screw rod is rotationally arranged on the fixed clamp, a screw hole is formed in the movable clamp, when the movable clamp rotates downwards from a horizontal state to a vertical state, the screw hole is in butt joint with the screw rod, and the screw rod is driven by a driving mechanism to rotate so as to be in threaded fit with the screw hole; and the movable clamp performs a horizontal sliding stroke so as to be close to the fixed clamp to clamp the bare conductor.

The invention provides a nut thread defect detection method and system and a medium, and the method comprises the steps: collecting a nut image based on a high-resolution camera, and carrying out the preprocessing of the nut image, and obtaining a preprocessed image; scanning the outer surface of the screw thread of the screw cap based on a laser scanner to obtain three-dimensional point cloud data of the screw cap; extracting image features based on the preprocessed image, generating image data, and performing fusion processing on the image data and the three-dimensional point cloud data to obtain fusion data; thread parameter identification is carried out through a deep learning algorithm based on the fusion data, and thread defect information is obtained; transmitting the thread defect information to a terminal in real time according to a preset mode; through combination of image processing, a three-dimensional laser scanning technology and a deep learning algorithm, automatic detection of screw cap threads is realized, and thread defects including the size, the shape, the number and the like of the threads can be rapidly and accurately identified, so that the detection efficiency and precision of a production line are improved.

In a compound bow, an axle, having threaded ends, is pushed through a hole in a cam. Cam spacers, having internal threads, are screwed onto the ends of the axle until the ends of the cam spacers abut the cam. The cam can rotate freely around the unthreaded middle portion of the axle. The ends of the cam spacers go into holes in limb brackets attached to the bow's resilient limb ends. In one embodiment, the ends of the cams are threaded, and a nut is tightened over the thread to shift the cam spacers and cam left or right relative to the limb brackets. In another embodiment, the cam spacers and limb brackets are threaded, and turning the cam spacer shifts the cam left or right. In both embodiments, the cam position is precisely adjusted and very stable.

The aluminum alloy structure bending equipment for bridge construction comprises a workbench, the top of the workbench is movably connected with a placing assembly, the placing assembly is provided with a slide way assembly, the slide way assembly is movably connected with two sets of supports, and conveying rollers are movably connected between the tops and the bottoms of the supports; a driving motor is fixed to the outer wall of the top of the support, the output end of the driving motor is connected to the top of a conveying roller through a coupler, the conveying roller is used for conveying the aluminum alloy structure, the support is fixed to the outer wall of the top of the workbench, and a bending roller is movably connected to the inner wall of the top of the support. Through threaded connection of the two-way threaded rod and the supports and the guiding effect of the guiding plate, the spacing distance between the conveying rollers on the two supports can be easily adjusted only by driving the two-way threaded rod to rotate, so that the two-way threaded rod is rapidly matched with aluminum alloy structures with different outer diameters, and preparation work before feeding is greatly simplified.

Disclosed is a method of fastening a cap of a container, the method including: specifying a screw thread engagement point of a cap and a neck ring of a container; and aligning the engagement point with a fastening start position of the cap and fastening the cap to the neck ring, in which the specifying of the engagement point includes detecting the engagement point by rotating the cap in a reverse direction in a state where the cap is seated on the neck ring.

The invention discloses a two-degree-of-freedom clamp capable of adjusting the bending moment and direction of a turbine blade and a test method. The two-degree-of-freedom clamp comprises a blade clamping component, an upper adjustable U-shaped head, a lower adjustable U-shaped head, an upper clamping rod and a lower clamping rod. The blade clamping component is in threaded connection with the upper adjustable U-shaped head and the lower adjustable U-shaped head, the other end of the upper adjustable U-shaped head and the other end of the lower adjustable U-shaped head are connected with the upper clamping rod and the lower clamping rod respectively, and the other end of the upper clamping rod and the other end of the lower clamping rod are connected with an upper clamping head and a lower clamping head of the fatigue testing machine respectively. The upper clamping rod and the upper adjustable U-shaped head are adjustably connected in pairs in the transverse direction intersecting with the vertical axis so as to adjust the eccentricity of the turbine blade load. The eccentric angle of the blade load can be adjusted by adjusting the rotation cycle of the blade clamping component. According to the clamp disclosed by the invention, by adjusting the eccentricity and the eccentricity angle during a turbine blade test, different bending moment directions and relative sizes of different sections during the turbine blade test can be realized, so that the aim of simulating a real load is fulfilled.

The invention relates to the field of fasteners, in particular to a fastener product quality tracing method and system, and the method comprises the steps: extracting a stud contour, screening edge points in the stud contour to obtain a thread point set, and carrying out the fitting of the thread point set to obtain a virtual thread curve; presetting a plurality of straight lines parallel to the central axis of the stud contour, calculating gray evaluation between the target intersection point and other pixel points except the target intersection point on the corresponding straight line, taking other pixel points corresponding to the maximum gray evaluation as actual intersection points, and traversing to obtain actual intersection points corresponding to ideal intersection points on each straight line; and for any straight line, calculating the position distance of any two adjacent actual intersection points to construct a distance sequence, judging that the stud workpiece is qualified in response to all the distance sequences meeting a preset condition, and judging that the stud workpiece is abnormal in response to any one of the distance sequences not meeting the preset condition. According to the invention, the precision of thread detection in a fastener product can be improved.

The utility model discloses sheet metal part butt-joint clamping machining equipment, and particularly relates to the technical field of sheet metal part butt-joint machining, which comprises a working table, a support frame is fixedly connected to the top of the working table, a sliding block is arranged at the bottom of the support frame, a welding device is arranged at the bottom of the sliding block, and a first threaded rod is inserted in the middle of the sliding block. The first threaded rod is arranged in the middle of the supporting frame, a limiting sliding groove is formed in the top of the workbench, and two limiting sliding plates are arranged in the middle of the limiting sliding groove. The sheet metal part is clamped and fixed to the top of the supporting plate through the arranged clamping mechanism, the two limiting sliding plates are controlled to drive the supporting plate and the top sheet metal part to move towards the opposite sides, butt joint use and mechanical butt joint can be facilitated, the butt joint accuracy can be guaranteed, and the butt joint efficiency is improved. And the electric push rod is started to control the supporting plate to obliquely rotate, the inclination angle of the butted sheet metal parts can be adjusted, and the using effect is improved.

The invention relates to the technical field of spiral finned tube laser welding, in particular to a solid spinning spiral finned tube laser welding machine. Comprising a first base and a second base, a threaded rod is rotationally connected between the first base and the second base, and the threaded rod is in threaded connection with a machining assembly; the first motor drives the driving belt wheel to rotate, so that the machining assembly conducts welding operation of the spiral fins on the surface of the base tube while moving, and through the transmission relation between the driving belt wheel and the driven belt wheel, the base tube synchronously rotates while the machining assembly conducts moving machining; according to the spiral finned tube machining device, the machining assembly is arranged to meet the welding requirement of the spiral finned tube, movement of the machining assembly and rotation of the base tube are controlled at the same time through the same driving structure, the stability and consistency in the machining process are improved, the machining speed can be adjusted more conveniently, fin welding is more uniform, and the welding quality is effectively improved.

The utility model relates to the technical field of ship mechanical part machining, in particular to a polishing device for ship mechanical part machining, and solves the problem that in the prior art, ship mechanical parts of different shapes and sizes cannot be conveniently adjusted and fixed, so that the polishing effect is poor. A polishing device for ship mechanical part machining comprises a machining table and a polishing machine, the machining table is provided with a sliding groove, the interior of the sliding groove is slidably connected with a mounting block, the top of the mounting block is provided with a bearing plate through a buffering mechanism, the surface of the bearing plate is fixedly connected with four supporting blocks, and the surfaces of the supporting blocks are in threaded connection with screws; a clamping drill is fixedly connected to the surface of the screw rod, a plurality of limiting grooves are formed in the surface of the bearing plate, and limiting rods are arranged in the limiting grooves in a penetrating mode. According to the polishing fixture, clamping and fixing of parts with different shapes and sizes are guaranteed, so that the parts can be normally polished, and the polishing effect of the parts cannot be affected.

Methods and systems for handling and dispensing fluid are disclosed herein. In some embodiments, a method includes dispensing fluid into an inner chamber and inserting the inner container into an outer chamber of an outer container. The method can include dispensing a coolant into the outer chamber of the outer container and coupling an outer container coupler of the outer container to a first coupler of a connector such that the connector defines a gap between the inner container and the outer container. The method can include coupling a second coupler of the connector to a lid coupler of a lid, wherein the lid coupler has the same thread pitch as the inward-facing threads of the outer container coupler of the outer container. The method can include cooling the fluid to a chilled storage temperature and dispensing the fluid out of the inner chamber.

The invention relates to the technical field of part polishing, in particular to a polishing device for an injection mold guide column. When a traditional polishing mode is used for polishing a guide column, the polishing efficiency is low, the guide column is prone to generating tiny deviation and shaking during rotation, the polishing precision is poor, some different impurities can be attached to the surface of the guide column before and after polishing, the polishing is not uniform enough, the polishing quality is poor, and the polishing effect is affected. A polishing device for an injection mold guide pillar comprises an outer frame; and the support frame (2) is fixedly connected with one side in the outer frame (1). The locking block is inserted into the clamping groove to lock the guide column on the chuck, the threaded shaft rotates to enable the polishing disc to move through the threaded block to gradually polish the side face of the guide column, the sliding frame drives the extrusion rod to extrude the inclined groove to enable the polishing column to move, in this way, the top end port of the guide column can be synchronously polished while the side face of the guide column is polished, and then the polishing speed is increased; the polishing efficiency is improved.

The invention relates to the technical field of test devices, in particular to a central clutch test device and test method.The top of a base of the test device is connected with a left side supporting plate and a right side supporting plate which are parallel and oppositely arranged left and right, and two parallel supporting shafts are fixedly connected between the left side supporting plate and the right side supporting plate; a middle supporting plate is connected between the two supporting shafts in a sliding mode and can slide along the supporting shafts. The right side of the left supporting plate is connected with a clutch cover assembly connecting disc; the left side of the middle supporting plate is connected with a central clutch mounting disc; a lead screw parallel to the supporting shaft is connected between the middle supporting plate and the right supporting plate, the left end of the lead screw penetrates through the middle supporting plate, and the middle supporting plate is rotationally connected through a bearing; the screw rod section of the lead screw is in threaded connection with the threaded hole of the right supporting plate. According to the invention, the central clutch and the clutch cover assembly can be separated from the gearbox, the clutch actuating mechanism is independently detected, the test efficiency is higher, and the test device is simple in structure.

The invention provides a tool applied to the field of petroleum drilling, and particularly relates to an electrically-controlled reducing cutter, which has the technical scheme that the extension and retraction of the cutter are accurately controlled by a control base driving motor and an electromagnet, wherein the control base driving motor comprises an MCU (Microprogrammed Control Unit) and a wireless communication module; the control base can receive a ground instruction and transmit an underground working state signal back in real time; meanwhile, the ratchet mechanism is matched with the electromagnet to achieve extending and retracting of the cutter position, and the pawl is always in close contact with the ratchet wheel under the action of the spring. And the lower shell is in threaded connection with the guide shoe. The cutting knife is driven to rotate through the transmission shaft, the cutting knife is controlled to stretch out and retract through the intelligent electric control system, continuous cutting of casing pipes with different pipe diameters can be achieved, the tripping frequency is reduced, and the casing pipe cutting efficiency in the well abandoning operation process is greatly improved.

A tamper-indicating and child resistant cap and container assembly, comprising a cap comprising: a cap top wall; a cap skirt having an inner wall which is at least partially threaded, and an outer wall having at least one squeezing location; at least one tamper-indicating band frangibly connected to a free end of the cap and having defined therethrough an opening; at least one tongue extending from the free end of the cap skirt which circumferentially spaced from the at least one squeezing location. The container has an open end and a neck, an outer wall of the neck being at least partially threaded and configured to cooperate with the at least partially threaded inner wall of the cap; and at least one protrusion extending from the outer wall of the container neck and configured to be received in the opening of the at least one tamper-indicating band.

The invention relates to the technical field of mine drilling, and discloses a fractured drill rod taking-out device which comprises a guide rod and a drill rod body, the outer diameter of the guide rod is smaller than the inner diameter of the drill rod body, the end, close to the drill rod body, of the guide rod is arranged to be in an arc shape, and the fractured drill rod taking-out device further comprises a positioning assembly used for clamping the inner wall of a fractured drill rod. The positioning assembly is arranged on the surface of the guide rod and comprises a plurality of movable plates hinged to the surface of the guide rod, a rotating shaft is rotationally connected to the axis position in the guide rod, right-hand threads are formed in the surface of the rotating shaft, push blocks are arranged on the sides, close to the interior of the guide rod, of the movable plates, and the push blocks are connected with the movable plates through connecting blocks; a moving block is arranged in the push block, and a plurality of balls are movably connected to the bottom of the moving block. The outer diameter of the guide rod is reduced, the guide rod is eccentrically inserted into the fractured drill rod, the outer expanding movable plate is matched to tightly clamp the inner wall of the fractured drill rod, and the fractured drill rod taking-out efficiency is improved.

An expandable interbody with a modular endplate has an outer column, an inner column threadedly coupled and translatable relative to the outer column along the longitudinal axis, and an expansion ring to adjust a body length of the expandable interbody. The expansion ring has a plurality of teeth, and the outer column has at least one arm for engaging a tooth of the plurality of teeth to lock the expansion ring. The inner column and / or outer column can include a connector for connection to a modular endplate that has a substantially hollow core. The modular endplate includes a plate with a set screw entrapped therein. The modular endplate has an aperture to receive the connector of the inner and / or outer column.

The invention discloses a fabricated strain insulator string device for an overhead transmission line, and relates to the technical field of electric power fittings, a plurality of disc-shaped insulating covers are hinged between a first U-shaped clamp and a second U-shaped clamp, and the first U-shaped clamp is hinged to the corner of a wedge-shaped strain clamp; a front end wedge-shaped groove and a tail end wedge-shaped groove are formed in the wedge-shaped strain clamp, a plurality of pairs of arc-shaped clamping plates are arranged on the inner bottom wall of the front end wedge-shaped groove, a plurality of U-shaped threaded rods are arranged on the wedge-shaped strain clamp in a sleeving mode, a plurality of fixed connecting plates are fixedly arranged on the wedge-shaped strain clamp, and the U-shaped threaded rods penetrate through the fixed connecting plates and are locked with a pair of self-locking nuts in a threaded mode. And a T-shaped seat is fixedly arranged in the middle of the U-shaped threaded rod, and a pressing mechanism is mounted on the T-shaped seat. The device can be transported in a split mode and is adaptive to complex terrains; the arc-shaped clamping plate and the downward pressing mechanism clamp the power transmission line in a dual mode, adapt to power transmission lines with different diameters and prevent looseness. Components are detachable, installation and maintenance are convenient, cost is reduced, and efficiency and power supply reliability are improved.

The utility model discloses a temperature control water nozzle service life testing machine, and relates to the technical field of temperature control water nozzle service life detection. The temperature control water nozzle service life testing machine comprises a testing stand and a constant temperature water nozzle body, a fixing frame is fixed to the rear side of the top of the testing stand, a water supply pipe is embedded in the fixing frame, a water outlet pipe is arranged on the front side of the water supply pipe, a threaded sleeve is rotationally connected to the front end of the water outlet pipe and is in threaded fit with the constant temperature water nozzle body, and a hose is connected between the water supply pipe and the water outlet pipe. A screw rod is obliquely arranged on the inner side of the fixing frame, a movable block is arranged on the screw rod in a threaded mode, an elastic assembly is connected to the bottom of the movable block, a U-shaped frame is connected to the lower end of the elastic assembly, a pressing wheel is rotationally installed on the inner side of the U-shaped frame through a rotating shaft, and the pressing wheel is matched with a hose. By combining the elastic effect of the elastic assembly, the pressing wheel extrudes the hose, the size of the drift diameter of the hose is changed, the purpose of adjusting the water flow speed is achieved, the structure is simple, and use is convenient.

The invention relates to the technical field of welding, and provides a steel pipe welding auxiliary device for steel furniture production, which comprises an adjusting mechanism, a control mechanism is fixedly mounted on the inner left side of the adjusting mechanism, a fixing mechanism is fixedly mounted at the inner upper end of the adjusting mechanism, and the adjusting mechanism comprises a base, a transmission rod and a gear motor. Mounting bins are fixedly connected to the two sides of the upper end of the base correspondingly, lifting bins are slidably connected to the interiors of the mounting bins correspondingly, first threaded rods are in threaded connection to the lower ends of the lifting bins correspondingly, and first bevel gears are fixedly connected to the lower ends of the first threaded rods correspondingly. Through the cooperation of the adjusting mechanism and the control mechanism, the adjusting mechanism of different welding surfaces at the welding seam is optimized, the height change amplitude of the seam can be effectively controlled, obvious lifting of the seam is avoided, the stability of the welding process and the welding quality are guaranteed, the operation intensity of workers is reduced, and the production efficiency is improved. And the comfort and the convenience in the operation process are improved.

The invention is suitable for the technical field of pipe outer circle grinding, and provides a PE pipe outer circle grinding device which comprises a workbench, a grinding mechanism used for grinding a pipe is arranged on the workbench, a supporting frame is horizontally and slidably connected with a moving seat, and the supporting frame is fixedly connected with a second motor. An output shaft of the second motor is in threaded connection with a moving seat, the moving seat is fixedly connected with an electric lifting seat, and the telescopic end of the electric lifting seat is fixedly connected with a guide sleeve; the pipe polishing machine further comprises a feeding speed optimization system which can regulate and control the extension speed of the electric lifting seat by comprehensively evaluating the polishing state of the abrasive belt, the clamping state of the clamping mechanism and the stable state of the pipe, and then the feeding speed during pipe polishing is optimized. The feeding speed self-adaptive adjustment under the interference of multiple factors such as abrasive belt abrasion, pipe temperature change and clamping force fluctuation is achieved.

The utility model relates to the technical field of bottle-making machine turnover, and discloses a turnover device for a bottle-making machine, which comprises a first vertical plate, a right end belt of the first vertical plate is connected with a conveyor belt, a right end belt of the conveyor belt is connected with a second vertical plate, and the bottom of the second vertical plate is fixedly connected with a support frame; the two ball supporting plates are distributed in a bilateral symmetry mode with the conveying belt as the center, connected to the transmission lead screw through threads and capable of sliding in the adjusting stand columns and the distance adjusting grooves, and the structure enables the ball supporting plates to achieve accurate lifting motion under driving of the lifting motor and the transmission lead screw. The first overturning clamp and the second overturning clamp which are located on the ball supporting plate achieve clamping, overturning and other operations on objects on the conveying belt through the air cylinder, the bearing and the overturning motor respectively, the first overturning clamp and the second overturning clamp are located at the top of the conveying belt, and the objects on the conveying belt can be conveniently machined.

The invention belongs to the technical field of precision machining and in-situ measurement, and discloses an in-situ measurement and bidirectional tool setting integrated system and method for an internal thread grinding machine. Various system errors and random errors are effectively eliminated through a non-hardware error compensation model and a high-fidelity data processing algorithm, in-situ measurement of the internal thread is completed in a modularized mode, and high-precision and high-efficiency in-situ automatic measurement of key parameters such as the pitch diameter, the thread pitch and the thread angle of the thread is achieved. The system can be directly integrated on the internal thread grinding machine, measurement is rapidly completed after machining or between procedures, workpieces do not need to be disassembled, secondary clamping errors are effectively avoided, and the detection efficiency and consistency are greatly improved.

A length-adjustable shock absorber includes a tubular body and an adjusting cylinder. The tubular body has one end formed with threads to form a threaded section. The threaded section is interrupted in an axial direction by at least one recessed groove. The adjusting cylinder is threadedly connected to the threaded section and has at least one through hole. The through hole is rotated along with the adjusting cylinder to face the recessed groove. A locking lever is pivotally connected outside the through hole. The locking lever is pivotable between a locking position and an unlocking position. When the locking lever is pivoted to the locking position, it is engaged in the recessed groove to lock the adjusting cylinder. When the locking lever is pivoted to the unlocking position, it is disengaged from the recessed groove to unlock the adjusting cylinder.

The utility model provides a spring-free type bushing end screen, which belongs to the technical field of bushing end screens and comprises a flange seat, an insulating sealing sleeve is embedded in an inner cavity of the flange seat and is clamped in the inner cavity of the flange seat through a locking component, and a locking thread is arranged at the end part, far away from the flange seat, of a binding post along the outer wall. The inner wall of the side, away from the flange hole, of the flange base is in threaded connection with a grounding piece, the grounding piece is arranged outside the locking thread in a sleeving mode, anti-skid lines are arranged on the outer wall of the grounding piece in the circumferential direction, external threads are formed in the bottom of the outer wall of the grounding piece in the circumferential direction, internal threads are formed in the top of the inner wall of the flange base, and therefore the grounding piece is in threaded connection with the top of an inner cavity of the flange base. After the grounding piece is in threaded connection with the flange seat, the end screen is in a continuous grounding state, stable operation of the transformer is guaranteed under the condition that overall stability is guaranteed, and the protection effect is enhanced.