54 results about "Thick section" patented technology

The invention relates to a thick and large-section nodular cast iron inoculation method based on a laminated slow-release inoculation block. The method comprises the following treatment steps that S1, raw materials are prepared; s2, the high-purity pig iron, the waste steel and the nodular cast iron foundry returns in the step S1 are put into an electric induction furnace to be smelted; s3, performing carbon and silicon testing on the molten iron subjected to slag removal in the step S2 by using a carbon and silicon analyzer, and adjusting components; s4, carrying out primary spheroidizing inoculation by adopting a pouring method; and S5, after spheroidizing inoculation is completed, molten iron is poured into a sand mold, a laminated slow-release inoculation block is placed in the sand mold for slow-release inoculation, and a thick and large-section spheroidal graphite cast iron casting is formed. The method has the advantages that slow-release inoculation is implemented in the cross gate, and molten iron continuously and slowly releases an inoculant in the pouring process through the laminated slow-release inoculation blocks. By means of the method, inoculation recession can be effectively inhibited, the graphite form is improved, and finally the density and the spheroidization rate of graphite nodules in the center of the thick and large-section nodular iron casting are increased.

The utility model provides a disposable sampler, which belongs to the technical field of sampling equipment, is of an integrated structure, is in a through groove shape, has an arc-shaped cross section, and comprises a thick section, a thin section and a transition section for connecting the thick section and the thin section, the groove walls of the end parts of the thick section and the thin section obliquely extend downwards to the groove bottom in an arc shape in the length direction of the sampler, so that the orthographic projection of the end part of the groove bottom on a horizontal plane is in an arc shape; and the groove bottoms of the thick section, the thin section and the transition section are in the same cambered surface. According to the sampler provided by the utility model, samples in a container bottle can be shoveled into the groove when the samples are few, and meanwhile, the arc-shaped groove is designed, so that the sampler can conveniently scrape the samples attached to the container bottle into the groove in the bottle, and the effect that the samples are completely taken can be realized. By adopting the design of the thick section and the thin section, small bottles and large bottles can be conveniently sampled.

A building support resisting seismic transverse waves comprises a vertical buffer plate parallel to a building outer wall, an upper transverse plate and a lower transverse plate, the upper transverse plate and the lower transverse plate are vertically parallel, the buffer plate is fixed to the ground, buffer materials are arranged between the buffer plate and the building outer wall, the upper transverse plate is flush with the ground, and a plurality of supporting columns are arranged between the upper transverse plate and the lower transverse plate; the supporting column is divided into an upper movable section and a lower fixed section; the movable section is fixedly connected with the upper transverse plate, and the fixed section is fixedly connected with the lower transverse plate; a fixed steel core is arranged in the center of the supporting column and is divided into an upper-half thick section and a lower-half thin section, the thin section is fixedly connected with the fixed section, the upper end slightly exceeds the upper bottom surface of the fixed section, and the lower end exceeds the lower transverse plate and is fixedly connected with a foundation; two slotted holes with different diameters are formed in the center of the movable section, and the diameters of the two slotted holes are slightly larger than those of the thick section and the thin section of the fixed steel core respectively. Damage of earthquake transverse waves to buildings can be reduced, building loss is avoided, and personnel and property safety is guaranteed.

The invention discloses a grading buffering type steel structure unloading adjusting device and method, and belongs to the technical field of steel structure engineering. Comprising a special-shaped steel plate, an L-shaped angle steel connecting piece, a fixing base, a spring steel sheet, a bowl-shaped outer-layer steel shell, a square gradient grid steel plate, a connecting strength bolt, an angle steel bolt, a slope arc extension plate fixing bolt, a slope arc extension plate, a bowl-shaped inner-layer steel shell and an L-shaped support, the special-shaped steel plate is in a long strip shape, the two ends of the special-shaped steel plate are thick sections, and the middle of the special-shaped steel plate is a thin section; the special-shaped steel plate is subjected to graded deformation according to the thickness difference, elastic friction cooperation is achieved through steel sheet-friction block compositing, the nested steel shell is subjected to hierarchical bearing, gradient grids are gradually changed along with the density to transfer force, extra regulation and control are not needed, the friction coefficient is high, the friction coefficient is high, and the friction coefficient is high. The load magnitude is automatically adapted, the response precision and the unloading efficiency are improved, and the structural safety and durability are enhanced.

The utility model relates to a kind of hard alloy assembly pinch roll, belong to steel rolling equipment technical field.The pinch roll includes roll ring, base and cover plate;The base and cover plate are all ladder shaft structure, and are divided into thick section and thin section;The base is coaxially arranged with cover plate and thin section is opposite, is fixedly connected by fastener, and two thin sections butt joint form the roll ring installation groove extending in circumference;The base and cover plate central through hole are equipped with inner hole;The roll ring is set in base and cover plate outer, and the inner hole of roll ring is equipped with the convex extending in circumference, the convex and the roll ring installation groove shape are matched and there is radial and axial interference fit.The utility model realizes the consideration of economy and durability by assembly structure, and reduces the instability of non-integral structure by structural design.

Rolling bearing holder unit (1, 1A, 5, 5A, 6, 7, 7A) comprising: a rolling bearing (2) including an outer ring (10), an inner ring (20) arranged coaxially with the outer ring (10) on an inner circumferential side of the outer ring (10), and a plurality of rolling elements (30) arranged between the outer ring (10) and the inner ring (20) having a predetermined axis of rotation (m); a bearing holder (60, 60A, 70, 70A, 80, 90, 90A) arranged in contact with an outer circumferential surface of the outer ring (10) or an inner circumferential surface of the inner ring (20) of the rolling bearing (2); and a strain gauge (100) incorporating a resistor configured to detect strain of the outer ring (10) or the inner ring (20), wherein the bearing holder (60, 60A, 70, 70A, 80, 90, 90A) has a thick section (61, 61A, 71, 71A, 81, 91, 91A) and a thin section (62, 62A, 72, 72A, 82, 92, 92A) with a thickness,which is smaller than the thickness of the thick section (61, 61A, 71, 71A, 81, 91, 91A), the strain gauge (100) is arranged on the thin section (62, 62A, 72, 72A, 82, 92, 92A), a preload is applied to the rolling bearing (2) to produce a predetermined contact angle, the thick section (61, 61A, 71, 71A, 81, 91, 91A) is arranged in contact with at least one area (DO) extending from an intersection (CO) of a straight line indicating the contact angle and the outer circumferential surface of the outer ring (10) or the inner circumferential surfaces of the inner ring (20) to a preload-side end face, wherein the preload-side end face is an end face of the outer ring (10) or of the inner ring (20) which is close to the intersection point (CO), and wherein the thin section (62, 62A, 72, 72A, 82, 92,92A) is in contact with a part of the outer circumferential surface of the outer ring (10) or a part of the inner circumferential surface of the inner ring (20).

The invention relates to a thin glass with a usable area having a thickness t of 15 to 300 µm and at least one side edge region, wherein the side edge region is in the form of a thickening with a maximum thickness T max with 1 <T max The invention relates to a manufacturing process for the thin glass, wherein the surface of the side edge region is continuously curved and connects to the usable area. The invention further relates to a manufacturing process for the thin glass.

Such a protective device with a flexible surface sheet, which is received in an edge area in a dimensionally stable hollow profile, which is provided with a passage slot for the surface sheet, is known. According to the invention, a web material of the flexible sheet is compactly joined in the edge region to achieve a thickening whose cross-section is larger than a free cross-section of the passage slot, and that form-fitting, force-fitting or material-locking fixing means are provided which fix the compact joining of the sheet. Use in passenger cars

The present invention relates to the field of thermal management technology for foldable screen electronic terminals, and in particular to a bendable liquid-cooled heat dissipation module of unequal thickness, a manufacturing method, and a foldable screen terminal, wherein the bendable liquid-cooled heat dissipation module of unequal thickness comprises a flow channel substrate having a flow channel film material and a panel film material, wherein the flow channel film material and the panel film material are stacked and sealed by splicing thick sections and thin sections with splicing gaps; the flow channel film material and the panel film material after being stacked and sealed with each other are hot-melt-sealed at the two end positions of the splicing gap to form joints, thereby constituting a flow channel substrate having a flow path passing through the thick section and the thin section between two adjacent thick sections; this solves the problem of irreversible degradation of the film material in the hot-pressing area caused by the hot-pressing thinning method of traditional unequal thickness flow channel substrates, and can reduce the requirements for sealing equipment and tooling, thereby efficiently and reliably achieving the sealing of the flow channel substrate, eliminating the risk of leakage, and having a simple process, which is convenient for batch processing and production.

To provide an inter-tunnel cut-off structure, a cut-off sheet, and a construction method for a large-section tunnel, which can be easily and surely constructed.SOLUTION: This water cut-off structure 3 between the tunnels is provided with a water cut-off sheet 4 arranged astride the adjacent box bodies 2, and a pressing tool 5 for holding an end part of the water cut-off sheet 4, and this construction method of the large cross section tunnel 1 uses this water cut-off structure 3 between the tunnels. A thickened part 44 is formed at the end of the water stop sheet 4 by providing a core material 42. A locking part 52 is formed at the end of the pressing tool 5, and the pressing tool 5 presses the water stop sheet 4 at the position of the core material 42 and holds the end of the water stop sheet 4 in a state of being locked to the thickened part 44 by the locking part 52.SELECTED DRAWING: Figure 2

A method of producing glass-based articles having sections of different thicknesses is provided, where a maximum central tension in a thinner section is less than that of a thicker section. The method includes reducing the thickness of a region of a glass-based article that includes a compressive stress layer extending from a surface to a depth of compression to form a glass-based article with multiple thickness regions, and then ion exchanging the glass-based article to form a stress profile in the thinner region that has a maximum central tension that is less than a maximum central tension of a stress profile of the thicker region. The glass articles produced by the method are also provided.

This invention relates to the field of lost-casting technology, and provides a point-to-point feeding gating system and method for casting thick sections of lifting lugs in lost-casting. The system includes a pouring cup, a sprue, and a runner. The pouring cup connects to the sprue, and the sprue connects to the runner. Four ingates are provided above the runner, directly connecting to the thick sections of the lifting lugs at the four corners of the foam model of the casting, forming a single feeding channel from the runner to the thick sections of the lifting lugs. The ratio of the cross-sectional area of ​​the runner to the cross-sectional area of ​​the ingates is 1.5:1 to 2.5:1, and the ratio of the cross-sectional area of ​​the ingates to the maximum cross-sectional area of ​​the thick section of the lifting lugs is 1:3 to 1:5. By adopting a simplified structure with a single main runner and four ingates, the redundant runners required for feeding the lifting lugs in traditional solutions are eliminated, reducing the material consumption of the gating system by more than 50% and increasing the process yield to over 85%.

This invention provides a post-weld heat treatment method for a tee branch pipe butt joint: After welding, the weld is cooled to 100°C and held at that temperature for 2 hours to allow for martensitic transformation. The main pipe and branch pipe are heated sequentially, with the main pipe reaching 650°C and the branch pipe reaching 750°C. The absolute value of the temperature difference between the branch pipe and the main pipe at the start of heating is equal to the absolute value of the temperature difference between the branch pipe and the main pipe at the end of heating. The branch pipe is held at 750°C for 9 hours. The main pipe and branch pipe are then cooled sequentially, eventually reaching 300°C simultaneously. After cooling to 300°C, the external heat source is cut off, and the pipe is kept at that temperature for slow cooling. The beneficial effects of this invention are: it ensures a controllable temperature gradient between the main pipe and branch pipe during the heating process, utilizing the higher temperature of the branch pipe to ensure sufficient stress release in its thicker sections, while preventing the induction of new thermal stress in the joint area due to excessive temperature difference.

The invention relates to the technical field of manufacturing of square throttle valve forgings, in particular to a production and manufacturing process of Inconel 625 square throttle valve forgings for deep sea oil and gas exploitation, which comprises the following steps: firstly, selecting proper raw materials according to an alloy formula of the square throttle valve forgings, smelting the raw materials into an electroslag ingot through a smelting process, and then treating the surface of the electroslag ingot, oxide skin and defects are removed; secondly, the step forging process is innovated, through the collaborative design of three-heating-number cogging forging and two-heating-number cutting forging and the combination of the large reduction rate and multidirectional deformation of the first pass, the strain penetration depth of the thick section is remarkably increased, compared with a traditional process, the effective strain cumulant is greatly increased, the problem that deformation at the corners of the square valve is not uniform is thoroughly solved, and the yield of the square valve is improved. And a narrow temperature area is accurately controlled, the finish forging temperature is monitored in real time by adopting an infrared thermometer, and a forgeable temperature window is stably controlled within the range of 170-200 DEG C in cooperation with die preheating and graphite lubrication, so that the risk of microcracks caused by the finish forging temperature less than 950 DEG C is avoided.

This invention provides a method for curing ultra-thick, irregular concrete roof slabs in medical linear accelerator chambers, belonging to the field of large-volume concrete structure construction technology. In this invention, as the roof slab pouring nears completion, the 1.5m thick slab is poured first, at which point the 3m thick portion of the slab is about to begin formwork pouring. The 1.5m thick slab enters the curing stage first and requires proper protection. After the 3m thick slab is poured, its sides differ from the top surface, requiring formwork curing. Curing utilizes geotextile for moisture retention and cotton cloth for insulation as basic methods, resulting in different treatment approaches for different thicknesses, the top surface, and the formwork-covered areas. This invention ensures that concrete at different development stages and under different exposure conditions can be cured in one go, preventing concrete cracking.

This utility model relates to the field of bridge engineering construction technology, and provides a rapid assembly and disassembly lifting tool for precast beams and slabs. It includes a lifting rod with a lifting hole at the top for connecting clamps or wire ropes, and a circular hole at the bottom of the rod containing a connecting pin. The connecting pin rotatably connects to the middle position of the boom, and the boom's cross-section has different shapes on both sides of the connecting pin. One end of the boom's cross-section is a short and thick section A, and the other end is a long and thin section B, with section A weighing more than section B. Limiting grooves are provided on the lifting rod, with several grooves evenly distributed along the length of the rod, and limiting plates are installed within these grooves. This utility model can meet the requirements for rapid assembly and disassembly of precast beams and slabs, reduces manual intervention, lowers the difficulty of operation for construction personnel, improves construction efficiency, reduces the input of manpower and materials, and is economical.

The utility model relates to the technical field of aluminum door and window production, in particular to a synchronous corner combining machine for aluminum doors and windows. The aluminum door and window synchronous corner combining machine comprises a box body, an assembling assembly, an assembling block and a sliding assembly, two bearing rods are symmetrically and fixedly connected to one side of the box body, a sliding groove is formed in the position, close to the bearing rods, of the top end of the box body, and a first electric push rod is fixedly connected into the sliding groove; a sliding block is fixedly connected to the driving end of the first electric push rod, a positioning block is installed on the side, away from the first electric push rod, of the sliding block through an assembling assembly, assembling blocks are symmetrically and fixedly connected to the top end of the box body, punching and riveting mechanisms are fixedly connected into the assembling blocks, and illuminating lamps are fixedly connected to the opposite angles of the rear side of the box body. According to the utility model, the problem of inaccurate positioning when thick section bars are positioned is effectively solved, so that the accurate splicing of corner parts during corner assembling is ensured, the overall appearance quality of doors and windows is improved, stable and appropriate pressure assistance is provided for the corner assembling process, and the section bars are prevented from displacing.

The utility model provides a fusible body structure, which is characterized in that a fusible body is provided with thin sections and thick sections which are arranged at intervals, the thickness of the thick sections is larger than that of the thin sections, each thick section is provided with a narrow neck, the two ends of the fusible body are the thin sections, and the fusible body is fused at the narrow necks firstly when being fused; in the direction perpendicular to the current passing direction, the minimum cross-sectional area of the narrow neck in the thick section is smaller than the cross-sectional area of the thin section, and the cross-sectional area of the non-narrow neck in the thick section is larger than the cross-sectional area of the thin section. Therefore, the fusible body structure enables the fuse to have a large I2T value, and the fuse can bear pulse current impact.

To provide a boom for a construction machine that can ensure sufficient strength against torsional load applied to an end of the boom.SOLUTION: In a boom 5 for a construction machine which has a boom body part 100 equipped with an upper plate 110, a lower plate 111, and left and right side plates 112 and 113, a boom top 200, and a boom foot 300, at least one of the boom body part 100 and the boom foot 300 is made of a cast steel body formed into a hollow box-shaped structure that opens toward the boom body part 100 and is welded to the boom body part 100. The cast steel body has a thick-walled portion 211 formed with a thickness t1, a thin-walled portion 212 formed with a thickness t2 that is thinner than t1, and a thickness-changing portion 213 whose thickness changes from t1 to t2 along the extension direction of the boom body part 100. The upper plate 110, the lower plate 111, and the left and right side plates 112 and 113 of the boom body part 100 are welded to an outer surface of the thick-walled portion 211.SELECTED DRAWING: Figure 4

This application discloses a deviation measuring mechanism and a material conveying device. The material conveying device forms a thick section and at least one thin section. The deviation measuring mechanism includes a mounting frame, a triggering member, and a detection member. The detection member sequentially forms a substandard detection area, a standard detection area, and an over-standard detection area along the thickness direction of the material conveying device. When the triggering member comes into contact with the thin section, it is pushed by the thin section so that at least part of it is placed in the substandard detection area and outside the standard detection area. The triggering member can come into contact with the thick section and be pushed by the thick section so that at least part of it moves from the substandard detection area to the standard detection area and is outside the over-standard detection area. The triggering member can be further pushed by the thick section it comes into contact with so that at least part of it moves from the standard detection area to the over-standard detection area. When the detection member detects that at least part of the triggering member is placed in the substandard detection area and outside the standard detection area or at least part of it is placed in the over-standard detection area, it generates a corresponding deviation correction signal.

A force sensor includes: a first substrate, a second substrate and a third substrate that are disposed so as to be spaced apart from each other in a plate-thickness direction; a first connection member connecting the first substrate to the second substrate so that the same are displaceable in the plate-thickness direction; a second connection member connecting the second substrate to the third substrate so that the same are displaceable in a direction perpendicular to the plate-thickness direction; a first detection unit configured to detect relative displacement between the first substrate and the second substrate; and a second detection unit disposed extending in the plate-thickness direction between the second substrate and the third substrate for detecting relative displacement between the second substrate and the third substrate. The second substrate includes a thick portion in a region other than a mounting region of the second detection unit.

The application relates to the field of material organization control and heat treatment, in particular to a method for simulating white abnormal organization in the center of a thick section CrMo steel component. The specific process of the method is as follows: (1) smelting a steel ingot according to the composition of the thick section CrMo steel component, and forging the steel ingot into a test block; (2) controlling the segregation state of the test block through high-temperature diffusion annealing; (3) confirming that the test block reaches an ideal segregation state by using an electron probe (EPMA); (4) processing the test block into a standard Gleeble sample, and obtaining grain sizes consistent with the white abnormal organization and the surrounding organization in the Gleeble thermal simulation testing machine through heating parameter control; and (5) simulating the white abnormal organization in the Gleeble thermal simulation testing machine through cold speed and stress control. The application can well simulate the white abnormal organization in the center of the thick section CrMo steel component.

The present application belongs to the field of casting materials, and provides a large volute casting and a preparation method thereof. The present application adopts a ternary synergistic spheroidizing treatment design of yttrium-based heavy rare earth spheroidizing agent, MgO@CaO core-shell structure spheroidizing agent and graphite morphology regulating element. Through step-by-step addition and accurate process control, excellent performance of a graphite spheroidizing rate ≥ 95%, a tensile strength ≥ 500 MPa and an elongation rate ≥ 7% is achieved, a microstructure of spheroidal graphite + ferrite + pearlite and an interface transition layer rich in Ca, Mg, C, O and Y elements are formed, and problems such as insufficient mechanical properties of traditional large volute castings, unstable casting quality of thick sections, formation of chunky graphite and the like are solved, so that the present application has wide application value in the manufacturing of water pumps, fans, compressors and the like.

The application provides a 450MPa-grade super-thick-section high-nickel low-temperature cast steel and a heat treatment process thereof, and relates to the technical field of cast steel materials.The chemical components of the cast steel are as follows in terms of percentage by weight: C: 0.01%-0.05%; Si: ≤0.20%; Mn: 0.3%-0.7%; Ni: 9.5%-10.5%; Cu: 0.1%-0.3%; S: ≤0.010%; P: ≤0.015%, and the balance is iron Fe and impurities.The cast steel has good weldability, the maximum casting wall thickness can reach 1000mm, has good uniformity, the yield strength is not lower than 450MPa, and the impact absorption energy at-60 DEG C is not lower than 165J, and can be used in the fields of large ship hull structures, ocean engineering, mines, power and mechanical engineering and the like which have high requirements on the strength and thickness of cast steel.

The application provides a kind of thick section composite compression performance test method and test device, it is related to test or analysis material technical field, including the following steps: design test piece size and determine working section length;Estimate failure load and calculate minimum friction load;Determine the groove parameter of netted groove, calculate the comprehensive friction coefficient of clamping surface and calibration correction, calculate minimum pre-tightening force;According to pre-tightening force, determine bolt diameter and tightening torque, and then determine test piece clamping length and total length;Prepare test piece and process netted groove, apply tightening torque in stages so that end face parallelism meets requirements;Apply axial compression load, collect load-displacement and load-strain data, calculate compression strength and compression modulus and determine failure mode;Real-time monitoring and abnormal early warning are carried out during testing.The problem that thick section composite compression performance test is prone to premature abnormal failure is solved, and its compression strength and compression modulus can be accurately and reliably obtained.

The application provides a cross-duct thermocouple type temperature sensor, and belongs to the technical field of sensors, comprising a armored thermocouple installed in an inner duct, a special-shaped armored cable for transmitting signals in the inner and outer ducts, and a stepped armored cable in the outer duct, which are sequentially connected; the stepped armored cable comprises a stepped shell, a bushing and a cable; the stepped shell comprises a first shell and a second shell connected with each other, the first shell and the second shell are sleeved on the cable, the bushing is arranged between the second shell and the cable, a plurality of bushings are arranged in parallel along the axial direction of the cable, and gaps are arranged between adjacent bushings. The first shell comprises a first section, a second section and a thick section designed in one piece, the thick section is located between the first section and the second section, the second shell is cylindrical, the second shell is sleeved on the second section, and the length of the second shell is greater than the length of the second section. The application improves the structural stability and signal transmission reliability, and has the characteristics of light weight.

Improved test for characterizing interface toughness in mode II and associated test specimen. The specimen (10) has an initial notch (40) extending across the entire width of the specimen (10) parallel to its plane P. The specimen comprises three parts following each other longitudinally in a contiguous manner, namely a thin part (11) of thickness H0, a thick part (13) of thickness H2, with H2 > H0, and an intermediate transition part (12) of variable thickness H1, located between the thin part (11) and the thick part (13).The initial notch (40) is capable of propagating into the intermediate portion (12) and possibly into the thick portion (13) parallel to plane P when the specimen (10) is subjected to a three-point bending test, with a first support (21) located under the thin portion (11), a second support (22) located under the thick portion (13), and a load (30) applied to the thick portion (13) between the first support (21) and the second support (22). Figure to be published with the abbreviation: Figure 6.

The invention relates to a device (10) for connecting a pipeline (11) of a refrigerant circuit to a counterpart (50), said device comprising an end section (13) of the pipeline (11) and the counterpart (50), wherein the pipeline (11) comprises a first free end (12) and the end section (14) is arranged at the first end (12). The pipeline (11) comprises a thickened portion (14) in the end section (13), wherein the thickened portion (14) comprises a first contact surface (20) on a first side (15) in the longitudinal direction (13a) of the end section (13). The first contact surface (20) is arranged at the first end (12) of the pipeline (11), wherein the first contact surface (20) has the shape of a section (21) of a first sphere having a first radius (22), wherein the thickened portion (14) comprises a second contact surface (30) on a second side (16) in the longitudinal direction (13a), and wherein the second contact surface (30) has the shape of a section (31) of a second sphere having a second radius (32).

The utility model discloses a power supply device with a short circuit prevention mechanism, which comprises a seat part and a short circuit protector, and the short circuit protector comprises the short circuit prevention mechanism and an electromagnet. The short circuit prevention mechanism comprises a telescopic fuse, an insulating rod, a compression spring and a magnet, the telescopic fuse is arranged beside the sliding cavity, the head of the telescopic end of the telescopic fuse enters the sliding cavity, and a circuit between the left terminal and the right terminal is connected to the telescopic fuse; the insulating rod is divided into a thick section and a thin section, the thin section can press the pressing key after penetrating through the fourth through hole and the second through hole, the thick section enters the sliding cavity, and the side portion of the thick section is provided with an annular groove matched with the telescopic end. One end of the compression spring abuts against the edge of the fourth through hole, and the other end of the compression spring abuts against a step between the thick section and the thin section; the magnet is arranged in the sliding cavity and fixedly connected with the thick section, and the magnetic pole direction of the magnet and the electrified electromagnet form a mutual exclusion structure. The utility model can prevent the processor from being burnt out by large current.