9260 results about "Bushing" patented technology

Disclosed is a guidewire having a core wire and an outer tube within which the distal section of the core is inserted. The outer diameter of the tube is greater than the outer diameter of the proximal section of the core wire. The guidewire also includes a proximal coil and a distal, radiopaque coil each disposed over the distal section of the core. A bushing coil is disposed over the proximal coil and distal coil. The proximal coil, distal coil, and bushing coil aid in filling the annular space between the core and the tube and thereby centering and aligning the core and tube.

The invention discloses a transformer bushing high-frequency partial discharge signal on-line monitoring method and system, and relates to the technical field of electrical equipment insulation state monitoring, and the method comprises the steps: synchronously collecting signals based on a high-frequency current sensor and an ultrahigh-frequency sensor; performing mixed noise reduction and feature extraction according to the collected signals; and carrying out discharge type identification on the processed data by constructing a lightweight convolutional neural network, and carrying out early warning and positioning in combination with a dynamic alarm threshold. The method can significantly improve the signal-to-noise ratio and enhance the weak discharge signal detection capability by combining the dual-mode sensor with a hybrid noise reduction strategy of wavelet packet decomposition and adaptive filtering, adopts the lightweight convolutional neural network, supports edge equipment to implement reasoning, realizes intelligent identification of the discharge type, and improves the detection accuracy of the weak discharge signal. The insulation state of the transformer bushing is monitored online in real time, off-line dependence is reduced, the service life of equipment is prolonged, and the intelligent level of operation and maintenance of a power system is improved.

The invention discloses an automatic shock absorber assembling device and method. The automatic shock absorber assembling device comprises a rack, a rotating disc, a graduator arranged on a shell and used for driving the rotating disc to rotate and a plurality of jigs circumferentially arranged on the rotating disc. The shell and lining feeding and press-fitting mechanism, the transferring mechanism, the sealing cover feeding mechanism, the spin riveting mechanism, the torque detection mechanism and the discharging mechanism are arranged on the machine frame. The shock absorber assembling device has the advantages that the integration degree of all the mechanisms is high, products can be rapidly assembled, the shock absorber assembling efficiency is effectively improved, the size of the whole device is reduced, and the manufacturing cost is saved. According to the shell and lining feeding press-fitting mechanism, linings and shells can be fed at the same time, multiple performance detection of the linings can be completed, synchronous movement of the linings in all assemblies is achieved through the linkage transfer mechanism, and the press-fitting efficiency between the shells and the linings is effectively improved.

The invention discloses a transmission assembly assembling device which comprises a rotary disc assembly, a synchronous material taking and assembling unit, a pawl material taking and assembling mechanism, a shaft sleeve material taking and assembling mechanism, a bearing material taking and assembling mechanism, a pressing mechanism and a discharging mechanism, and the pawl material taking and assembling mechanism, the shaft sleeve material taking and assembling mechanism, the bearing material taking and assembling mechanism, the pressing mechanism and the discharging mechanism are all installed on a workbench. The synchronous material taking and assembling unit comprises a ratchet ring material taking and assembling mechanism, a crankshaft material taking and assembling mechanism and a gasket material taking and assembling mechanism which are installed on the first translation module and located above the rotary disc assembly, and a ratchet ring material conveying mechanism, a crankshaft material conveying mechanism and a gasket material conveying mechanism are arranged at the first working position of the synchronous material taking and assembling unit; the second working position of the synchronous material taking and assembling unit is matched with the third assembling positioning hole, a shaft sleeve conveying mechanism is arranged at the first working position of the pawl material taking and assembling mechanism, and a bearing conveying mechanism is arranged at the first working position of the bearing material taking and assembling mechanism. Automatic assembly can be achieved, and the assembly efficiency is improved.

The invention discloses a fault detonation simulation test method and platform for an extra-high voltage converter transformer network side bushing, and the method comprises the steps: providing a critical value calculation method for primary physical explosion and secondary chemical explosion of the extra-high voltage converter transformer network side bushing under different arc fault energy conditions; and the critical conditions of primary physical explosion and secondary chemical explosion can be accurately judged. According to the invention, the whole dynamic evolution process from rapid cracking of transformer oil and sudden pressure increase caused by converter transformer fault arc to superposition of physical explosion and explosion chemistry can be truly simulated, a grid-side bushing fault detonation critical discrimination method is provided, and technical parameters and theoretical support are provided for the explosion-proof and pressure-relief design of the converter transformer.

The invention discloses a sleeve fault diagnosis method and system. The method comprises the following steps: preprocessing an acquired sleeve infrared image to filter out a non-heating part; segmenting the image of which the non-heating part is filtered out to obtain a single sleeve image; diagnosing the sleeve fault according to the segmented single sleeve image. According to the invention, theinfrared image of the transformer sleeve is preprocessed and segmented, therefore, an infrared image of a single sleeve is obtained; the temperature of each part of the sleeve can be conveniently obtained by converting the gray scale of each pixel in the gray scale map of the infrared image of the single sleeve into the corresponding temperature value, the method is simple but very ingenious, thefaulted sleeve and the faulted area can be quickly positioned, the specific fault type can be judged, and convenience and quickness are achieved.

An oil-immersed insulating combined transformer for an ultrahigh-voltage electric power system, wherein a current transformer secondary winding (7) in an oil conservator (2) of the combined transformer is arranged in an aluminum current transformer housing (8); ring insulation (9) is provided outside the aluminum current transformer housing (8); an insulating tube (11) and lead insulation (12) are provided inside a porcelain bushing (3), and the lead insulation (12) and the ring insulation (9) are integrally arranged; the insulating tube (11) supports the aluminum current transformer housing (8) and is arranged in the lead insulation (12); a voltage transformer core assembly (19) comprises a voltage transformer core column (13), which has a lead through hole (20) in the middle and is arranged in the insulating tube (11); a secondary lead of the current transformer secondary winding (7) passes through the lead through hole (20); and a voltage transformer secondary winding (15) is wound on the voltage transformer core column (13) and is arranged between the voltage transformer core column (13) and the insulating tube (11). The transformer can be safely applied to an ultrahigh-voltage electric power system.

The invention discloses an extra-high voltage DC bushing insulation state monitoring system and method, and belongs to the technical field of bushing monitoring, and the system comprises a monitoring platform, a bushing partial discharge monitoring device, and a bushing dielectric loss, capacitance and leakage current monitoring device. The bushing partial discharge monitoring device comprises a high-frequency partial discharge acquisition module and a high-frequency pulse current sensor, and the high-frequency pulse current sensor, the high-frequency partial discharge acquisition module and the monitoring platform are in signal connection in sequence; the bushing dielectric loss, capacitance and leakage current monitoring device comprises a dielectric loss acquisition module, a leakage current sensor and a signal sampling unit, the leakage current sensor and the signal sampling unit are both in signal connection with the dielectric loss acquisition module, and the dielectric loss acquisition module is in signal connection with the monitoring platform. According to the invention, through integration of the monitoring platform and the monitoring equipment, comprehensive real-time monitoring of the running state of the sleeve is realized.

The invention belongs to the technical field of aging state evaluation, and discloses a high-voltage dry-type bushing insulation aging state evaluation method based on frequency domain characteristics. According to the method, the FDS is adopted, and the aging state of the insulating material is evaluated according to the change of the complex capacitance, the complex dielectric constant, the dielectric loss factor and the like of a medium along with the frequency under a low-voltage sine alternating electric field. The FDS shows remarkable superiority in a plurality of aspects. The method comprises the following steps: firstly, measuring a dielectric constant and dielectric loss of an insulating medium in a wide frequency range by an FDS method so as to obtain response characteristics of the insulating material under different frequencies; according to the method, the frequency domain dielectric spectroscopy FDS is combined with the advantages of wide frequency range measurement, frequency domain feature recognition, comprehensive reflection of electrical characteristics and the like, so that accurate evaluation of the insulation aging state of the high-voltage dry-type bushing is realized. The safety and the stability of a power system can be improved, and faults and accidents caused by insulation aging can be reduced.

The present invention relates to the technical field of welding equipment, specifically to a welding device for processing a sleeve condenser, including an intermediate connecting frame, the top and bottom of the intermediate connecting frame are fixedly installed with end frames, a movable lifting frame is driven down by a driving motor, two buffer pads apply pressure to the sleeve condenser to fix the sleeve condenser, when multiple welding heads are installed, multiple welding heads weld the positions between the upper and lower pipes of the sleeve condenser, when one welding head is installed, the welding head welds the positions between the upper and lower pipes of the sleeve condenser, the welding head is moved up and down to weld different positions between the upper and lower pipes of the condenser, and one-time welding can reduce the number of welding processes, thereby improving production efficiency. Compared with multiple welding, one-time welding can save a lot of time and labor costs. In large-scale production, this advantage is particularly obvious. One-time welding can also reduce the generation of welding defects and improve product quality and reliability.

The utility model relates to the technical field of heat dissipation transistors, in particular to a transistor pin sleeve assembling machine. Comprising a machine table, a material moving device, a limiting device and a foot sleeve sleeving device. The material moving device, the limiting device and the foot sleeve sleeving device are all arranged on the machine table. The material moving device is used for synchronously driving transistors on the feeding station and the sleeve sleeving station in the first direction. The limiting device is used for positioning the transistor on the sleeve station; the limiting device and the material moving device alternately operate to be matched. And the pin sleeve sleeving device is used for sleeving the pin of the transistor at the sleeve station with the pin sleeve. According to the transistor pin sleeve assembling machine, in the process of assembling a transistor, the limiting device and the material moving device can be alternately matched, so that the material moving process is quicker, the assembling efficiency is higher, and the production efficiency is further improved.

The present application relates to a high-voltage AC disconnector, and relates to the technical field of disconnectors, which includes a base and a conductive mechanism, two insulating columns are arranged on the base, and the two insulating columns are respectively arranged on the left and right sides of the top of the base, and the installation positions of the two insulating columns are provided with installation grooves, and the installation grooves are provided with easy-to-disassemble fixing mechanisms, and the easy-to-disassemble fixing mechanisms include installation components and clamping components, and the installation components include installation sleeves and connecting columns, and the installation sleeves are fixedly arranged in the installation grooves, and the connecting columns are fixedly arranged at the bottom of the insulating columns, and the connecting columns are adapted to the connecting columns. The present application has a reasonable structure, and the present application has a simple and convenient disassembly process, avoids the need to use external tools for operation, and improves the practical effect.

A scroll compressor includes a compressor shell; a frame (4) installed in the compressor shell; a first scroll (5) located in the compressor shell; and a second scroll (6) located in the compressor shell and being co-rotatable with the first scroll (5), to define a compression chamber (56) between the first scroll (5) and the second scroll (6), the second scroll (6) having a hub (41) that extends downward from a lower surface thereof; a transformer flange (8) supported on the frame and supporting the first scroll (5) and the second scroll (6), the transformer flange (8) being connected to the first scroll (5); an actuating mechanism (7) installed in the compressor shell and connected to the transformer flange (8), for driving the transformer flange (8) to rotate, so that the first scroll (5) and the second scroll (6) are driven to co-rotate; a crankshaft (9) assembly located in the transformer flange (8) and including an oil screw (10), an upper end (101) of the oil screw (10) being fitted with a hub (61) of the second scroll (6), a lower end of the oil screw (10) extending into an oil sump (31); and a plurality of supports (11, 12, 13, 14, 15, 16), such as bearings or bushings or gaskets, located on the same side of the compression chamber (56).

A position sensor of a motor includes: a housing in which a hollow is formed and an accommodation space is formed as surrounding the hollow; a ground ring formed through an inner circumferential surface of the housing; a first PCB installed in the accommodation space and formed with a first circuit part; an induction unit facing the first PCB and rotates; a connecting bushing embedded in the housing and electrically connected to the ground by a fastening member; and a relay unit installed in the accommodation space and relaying the ground ring and the connection bushing. The ground ring is formed with a body formed through the inner circumferential surface, a contact part formed on one side of the body and disposed of in the hollow, and a first connection part extending from the other side of the body and contacting the relay unit.

A first wiring pipe and a second wiring pipe are detachably connected in a splicing mode, the inner side of the end face of the first wiring pipe is provided with an extrusion conical groove, and the end face of the second wiring pipe is provided with a rubber embedding and sealing block in a bonding mode at the position corresponding to the extrusion conical groove. According to the utility model, the end sleeves, the built-in annular air bags, the air injection pipes and the rubber sealing rings are arranged at the end parts of the first wiring pipe and the second wiring pipe, so that the built-in annular air bags can be conveniently injected with air after weak current line connection, and the built-in annular air bags are deformed after air injection; therefore, the rubber sealing ring on the inner side is driven to tightly abut against the outer side of the weak current circuit, so that the weak current circuit and the end parts of the first wiring pipe and the second wiring pipe are sealed, and the weak current wiring joints in the first wiring pipe and the second wiring pipe are protected. And external impurities are prevented from entering to influence the connection and use of the weak current line.

The invention discloses an oil-immersed transformer active defense method and system based on pulse current characteristics. The acquisition device is used for acquiring output signals of high-frequency pulse current sensors mounted at a high-voltage bushing end screen grounding position, a high-voltage bushing position and an iron core grounding position to obtain digital pulse current signals; whether active defense is started or not is judged according to whether the instantaneous value of the pulse current signal at the iron core grounding position reaches a protection starting threshold or not; judging whether the current pulse cluster is a discharge pulse cluster with abnormal internal discharge or not based on the three groups of pulse current signal characteristics; and judging whether protection acts or not according to the number of abnormal discharge pulse clusters in a set period. According to the method, serious partial discharge in the large oil-immersed transformer can be identified, protection measures are actively taken, and the situation that serious discharge defects are further developed into arc breakdown faults is effectively avoided.

The utility model relates to a high-performance sealed viscous damping wall, and belongs to the technical field of civil engineering structures. Comprising steel frames, gapless spherical hinges, bushings, piston rods, pistons, oil cylinders, extension pipes, experiment connecting holes, shells, lug plates and embedded parts, the steel frames are arranged on the left side and the right side of the high-performance sealed viscous damping wall, the inner sides of the steel frames are symmetrically and fixedly connected with two or more sets of gapless spherical hinges, and viscous dampers are arranged between every two sets of gapless spherical hinges. The viscous damping wall has the beneficial effects and advantages that the viscous damping wall adopts a completely sealed structure, so that the pollution of silicone oil is avoided, and the durability of a product is ensured; the damping wall is easy to install on site, and the damping wall can be rotationally and obliquely installed according to the actual situation on site; an experiment table connecting hole is formed in the steel frame side plate, so that the non-destructive experiment of the viscous damping wall is realized; and the multiple groups of viscous dampers are connected with the steel frame through the gapless spherical hinges, so that the good cooperative work performance is achieved.

The invention relates to the technical field of oil field fracturing operation, and provides a horizontal well shaft completion pipe string and a reconstruction method.The horizontal well shaft completion pipe string comprises an original casing pipe, an inner casing pipe, a suspension packer, a shearing ball seat, a float collar, a float shoe and a plurality of composite metal pipe outer packers.The suspension packer is connected to one end of the inner casing pipe, and the shearing ball seat, the float collar and the float shoe are sequentially connected to the other end of the inner casing pipe; a plurality of composite metal pipe outer packers are sequentially arranged on the inner casing pipe at intervals and used for blocking an annular space between the original casing pipe and the inner casing pipe and forming a plurality of fracturing sections, the inner drift diameter of a reconstructed new shaft is large, large-displacement and high-pressure fracturing construction can be met, the construction cost is reduced, the repeated transformation efficiency of an old well reservoir is improved, and the construction period is shortened. And in the later period, the original gas production section can be ejected to implement commingling production, and the oil-gas output efficiency is further improved.

A jigsaw including a housing, a handle extending transverse from the housing in a direction along a handle axis, a battery selectively coupled to the handle, a foot plate configured to contact a workpiece during a cutting operation, a drive assembly powered by the battery and including a motor, a transmission driven by the motor, an output spindle driven by the transmission and coupled to a saw blade. The jigsaw further includes a scotch yoke mechanism to convert a rotational motion of the transmission to a reciprocating motion of the output spindle and the saw blade generally along a vertical axis that is perpendicular to the handle axis, wherein the scotch yoke mechanism includes a bushing eccentrically mounted to a driven gear of the transmission. The bushing includes a spherical bearing surface received within a laterally extending slot of the output spindle for sliding movement therewith.

The invention relates to the technical field of high-voltage electrical equipment, and particularly discloses a high-insulating-property thermoplastic sleeve and a method for preparing the same based on a co-extrusion process, the surface of a nonlinear layer is wrapped with an insulating material, so that the corona discharge phenomenon is avoided; and meanwhile, the same thermoplastic material is adopted as the insulating layer (including the first thermoplastic layer and the second thermoplastic layer) material and the base material of the nonlinear layer, so that no obvious interface exists between the insulating layer and the nonlinear layer, charge accumulation is avoided, insulation failure is avoided, the insulation and voltage resistance of the sleeve is improved, and the operation reliability is improved.

The invention discloses a laminated structure and a differentiated hole machining method of the laminated structure, and relates to the technical field of machining, the method comprises the steps that S1, first reaming is conducted on the laminated structure, and the laminated structure comprises two or more layers of laminated plates; s2, linings made of matched materials are selected according to the material characteristics of different plates; s3, bushings made of different materials are installed in the reamed holes of the matched plates by pulling the core rod; s4, the linings made of the different materials are extruded, so that the linings made of the different materials are in interference fit with the matched plates; and S5, secondary reaming is conducted on the laminated structure according to the assembly requirement, so that the inner diameters of the deformed bushings made of different materials are the same. According to the method, the fatigue performance of plates made of different materials is coordinated through a differential hole machining method, and the fatigue life of the laminated structure is remarkably prolonged; and it is guaranteed that hole machining of different machining amounts is conducted on the laminated structure under one-time hole forming, the continuity of the hole forming technology is guaranteed, and the hole position precision is improved.

The invention provides a transformer partial discharge positioning method and device based on bushing CT acquisition. The method comprises the following steps: acquiring a high-frequency partial discharge pulse signal of a current transformer at a transformer bushing; background noise of the pulse signal is removed, amplitude correction is carried out, and a corrected pulse signal is obtained; judging whether the partial discharge belongs to external interference or internal partial discharge based on the polarity distribution rule of the corrected pulse signal; if the interference is external interference, comparing the amplitudes of the correction acquisition signals corresponding to the bushings, and taking the position corresponding to the current transformer with the maximum amplitude as an interference source injection position; if partial discharge occurs in the transformer, calculating the distance proportion from the partial discharge position to the head end of the winding according to the attenuation characteristic of the pulse signal propagating in the winding and the pre-injected calibration square wave signal so as to determine the discharge position. According to the method, the method for determining the partial discharge position of the transformer is simplified, external interference and internal partial discharge signals can be quickly identified, and misoperation of a protection device is avoided.

The utility model provides an electrical connection structure used for a motor and the motor, and relates to the technical field of electrical connection structures of motors, the electrical connection structure comprises a busbar assembly, a wire holder and a plurality of electrical connection bars, the busbar assembly comprises a plurality of first connection bars, the plurality of first connecting bars are suitable for being connected with a wire outlet end of a stator winding of the motor, the wire holder comprises a plurality of second connecting bars and a plurality of separators arranged at intervals, and the plurality of first connecting bars, the plurality of second connecting bars and the plurality of electrical connecting bars are arranged in a one-to-one correspondence manner; each electrical connection bar is suitable for being connected between the corresponding first connection bar and the corresponding second connection bar, and a separator is arranged between every two adjacent electrical connection bars, so that every two adjacent electrical connection bars are separated. Therefore, the two adjacent electrical connection bars are separated by the corresponding separators, the insulation of the electrical connection bars is ensured, an insulating sleeve does not need to be added to the electrical connection bars, the space occupation of the electrical connection structure is reduced, and the installation process is simplified.

The invention discloses metal bushing press-fitting equipment, which relates to the technical field of metal automatic assembly, and has the technical key points that the metal bushing press-fitting equipment comprises a bushing feeding mechanism: a discharge port of a vibration disc is connected with an inclined first feeding slideway and then connected with a positioning groove, the bottom of the vibration disc is provided with a strip-shaped turnover port and a transmission belt, a belt driving assembly drives the belt to operate, and the direction is vertical to the feeding direction; a height limiting rod is arranged on the position adjusting groove, so that the lining topples over, and the lower portion is funnel-shaped and connected with a second feeding slide way; the bottom of a second feeding slide way is connected with a to-be-taken groove, the width in the groove is equal to the outer diameter of the bushing, and a limiting plate and a bushing adsorption assembly are arranged at one end and form a rectangular groove; according to the press-fitting mechanism, a workbench is provided with a first positioning assembly, an upper fixing frame top beam is connected with a lifting press-fitting assembly through a translation assembly, and a bottom movable part is connected with a clamping assembly and used for taking the lining. According to the automatic press-fitting device, the positioning precision of feeding and taking can be improved, and the efficiency and effect of automatic press-fitting are guaranteed.

The invention relates to a power transformer with an active anti-deflagration function and a monitoring method. The power transformer comprises a transformer oil tank, an ascending flanged base, a high-voltage bushing, a short-circuit copper sheet, a neutral point bushing, a high-frequency sensor and an ultrasonic sensor. The ascending flanged base and the neutral bushing are connected to the top of the transformer oil tank; one end of the high-voltage bushing is connected with the ascending flanged base through a bolt; two ends of the short-circuit copper sheet are respectively connected with two ends of any bolt; the neutral point bushing is grounded through a grounding wire; and the high-frequency sensor is respectively connected in series with the short-circuit copper sheet and the grounding wire. The ultrasonic sensors are arranged in the ascending flanged base and the transformer oil tank respectively, and the ultrasonic sensors in the transformer oil tank are distributed on the upper portion, the middle portion and the lower portion of the transformer oil tank. According to the power transformer, two kinds of partial discharge signals at different positions are collected, whether discharge occurs at different positions in the transformer or not is accurately judged in combination with a logic judgment method, the severity degree is judged, and therefore early warning or tripping instructions are accurately output at the initial stage of a fault to remove the fault, and operation safety is ensured.

The invention discloses a transformer protection method and device applied to an oiled paper capacitor type bushing, and relates to the technical field of electric power, and the method comprises the following steps: collecting pressure data and temperature data in the bushing in real time; performing fault analysis according to the pressure data and the temperature data to obtain a fault analysis result; the fault analysis result is that the equipment has a fault or does not have a fault; when the fault analysis result is that the equipment has a fault, a tripping signal is sent out; the tripping signal is used for controlling the transformer of the bushing to perform tripping operation. According to the application, whether the equipment has a fault is judged through the pressure data and the temperature data in the bushing acquired in real time, and the tripping signal is sent out when the equipment has the fault is analyzed, so that the transformer of the bushing is controlled to execute the tripping operation, further expansion of the fault is avoided, and the safety of the equipment and the safety of a related operating environment are guaranteed.

The invention relates to the technical field of thrust bearings, in particular to a preparation method of a tin-based babbitt metal bushing and the tin-based babbitt metal bushing. The preparation method of the tin-based babbitt metal bushing comprises the following steps that a transition layer containing tin is arranged on the surface of a thrust pad, plate-strip-shaped tin-based babbitt metal is arranged on the transition layer, pressure and ultrasonic waves are applied to the surface of the plate-strip-shaped tin-based babbitt metal, and welding is completed through ultrasonic pressure welding. According to the method, the tin-containing transition layer is arranged on the surface of the thrust pad, the thrust pad bushing is rapidly prepared through ultrasonic pressure welding, and element diffusion and hydrogen element escape among the bushing, the transition layer and the steel backing and atomic lattice distortion and electron movement between the babbitt metal bushing and the transition layer are promoted through the coupling effect of extrusion force and high-frequency vibration; the plate-strip-shaped tin-based babbitt metal is welded to the surface of the thrust pad to form the bushing, the prepared babbitt metal bushing coating is uniform and compact, the preparation technology is greatly simplified, and environment friendliness is achieved.

The utility model discloses an easy-to-install straight bushing, relates to the technical field of metal bushings, and aims to solve the problem that the fixing mode is too tedious after the existing bushing is folded due to the open-close type design, the easy-to-install straight bushing comprises a first bushing body and a second bushing body which are in a semi-ring shape, and one end of the first bushing body is connected with one end of the second bushing body in a hinged mode. The bushing is characterized in that a buckling component is arranged at the other end of the first bushing body, a notch is formed in the other end of the second bushing body, and a fastening component is arranged in the notch; when the first bushing body and the second bushing body need to be unfolded, the lock catch strip can be pulled, so that the lock clamping strip is separated from the buckle of the lock catch strip, and then the first bushing body and the second bushing body are unfolded; in this way, the mode that the first lining body and the second lining body are folded and then rapidly fixed through buckling of the lock catch strip to the lock clamping strip replaces the too tedious fixing mode after folding of an existing lining opening and closing type design.

A method of sealing a casing comprising the steps of deploying a thin wall tube in the region the casing is to be sealed, melting a low temperature alloy and allowing it to flow into the annulus between the thin wall tube and the casing, and allowing the low temperature alloy to solidify. The thin wall tube may include protrusions on its outer surface, of similar height so as to centralise the thin wall tube in the casing.

The embodiment of the invention provides a transformer bushing oil extraction tool system and a control method and device thereof, and the system comprises a multi-degree-of-freedom flexible positioning module, a real-time data collection and feedback control module, an electrical isolation and insulation module, and an intelligent alarm system. Automatic operation of oil extraction of the transformer bushing in an electrified environment can be achieved, the accuracy, the sealing performance and the safety of the oil extraction process are ensured, and the efficiency and the reliability of equipment maintenance are improved. Wherein the flexible positioning module enables the oil taking module to be accurately in butt joint with an oil taking port, the data acquisition and feedback control module monitors and adjusts pressure and flow in real time, and the stability of oil taking is ensured; the electrical isolation module provides necessary insulation protection to avoid high-voltage risks; and the alarm system automatically gives an alarm and stops operation when abnormity occurs, so that multi-layer safety guarantee is provided for system operation.