2015 results about "Blind hole" patented technology

The invention provides an automobile balance block die-casting mould, which comprises a push cylinder, an upper mould base, an upper mould, a lower mould and a lower mould base, wherein the upper mould is arranged on the lower end of the upper mould base; the lower mould is arranged on the upper end of the lower mould base; the upper mould base is connected to the upper end of the lower mould base through a guide pillar; cooling holes are formed in the upper end face and the lower end face of the upper mould base in a penetrating way; a guide sleeve is connected onto each cooling hole. According to the automobile balance block die-casting mould, each cooling channel is communicated with a blind hole, each blind hole is communicated with a cooling hole, and each guide sleeve is arranged on the corresponding cooling hole, so that the mould can be cooled conveniently and quickly through injecting cooling water in the guide sleeves; the cooling channels are arranged at equal distances and in parallel, so that cooling is uniform, the cooling effect can be further improved, and the product quality is improved; the automobile balance block die-casting mould is simple in structure, convenient to operate, and good in cooling effect.

The invention relates to a pre-compensation flexible assembling and adjusting mechanism of a large-diameter transmission reflector. The pre-compensation flexible assembling and adjusting mechanism comprises the large-diameter transmission reflector, a glue joint mandrel, an isolation telecentric flexible hinge, an isolation plate, a hooke flexible hinge, an adjusting flexible branch chain, an anti-rotation flexible branch chain, a back plate and a driving assembly. The large-aperture transmission reflector is provided with three blind holes for glue joint, and is connected with the isolation plate through three groups of glue joint mandrels and isolation telecentric flexible hinges, so that isolation of load deformation interference of the isolation plate is realized; the driving ends of the two adjusting flexible branch chains are correspondingly connected with two driving assemblies installed on the back plate, and the connecting ends of the adjusting flexible branch chains are connected with the isolation plate. One ends of the Hooke flexible hinges and the anti-rotation flexible branch chains are connected with the isolation plate, and the other ends are connected with the back plate; the device has the advantages of being simple in structural form, stable in movement and high in precision, meanwhile, the return clearance caused by axial load reversing under heavy loads can be avoided, the additional surface shape caused by assembling and adjusting stress is effectively isolated, and the additional surface shape caused by gravity is compensated.

The present application discloses a coaxially integrated servo motor pump with integrated drive control functions, comprising a motor pump housing, a controller housing, and an electrical connector. The motor pump housing is provided with a blind hole, a first cavity for accommodating a plunger pump assembly, and a second cavity for accommodating a servo motor assembly, wherein the plunger pump assembly and the servo motor assembly are connected via a rotating shaft. The controller housing is connected to one end of the motor pump housing, and a drive controller is provided within the controller housing. The blind hole communicates with the second cavity, and the electrical connector is sealed and connected to the blind hole, and the electrical connector is electrically connected to the servo motor assembly and the drive controller. The distribution plate and the sealing assembly are respectively sealed with both ends of the motor pump housing. Cooling is achieved through a cooling oil channel, which connects from one end of the motor pump housing near the plunger pump assembly to the second cavity and then divides into two paths, one path passing through the center of the rotating shaft, and the other path connecting to the first cavity and passing through the distribution plate. The coaxial integration of the drive control functions is achieved, and the cooling effect is good.

The invention relates to the technical field of hemispherical harmonic oscillator assembly, in particular to a welding method and device for an assembled hemispherical harmonic oscillator, and the device comprises a vibration welding platform and a clamping assembly located above the vibration welding platform; the vibration welding platform is used for bearing the sensitive base and providing a thermal field and a vibration field needed by welding, and the clamping assembly is used for clamping the center shaft and sending the center shaft into a center hole of the base. A heating unit and a composite vibration ultrasonic transducer are arranged in the platform, and the platform is configured to apply high-frequency vibration formed by superposition of vertical longitudinal waves and horizontal torsional waves to the base. The high-frequency vibration thixotropic effect is used for reducing the viscosity of the molten solder, the ultrasonic cavitation effect is used for forcibly discharging bubbles at the bottom of the blind hole, and the sound radiation pressure generated by the vibration standing wave field is used for driving the center shaft to achieve friction-free self-centering in the hole. According to the device, the problems of air bolt pseudo soldering and rigid assembly clamping stagnation in the traditional process are solved, and the assembly coaxiality and the connection strength of the harmonic oscillator are remarkably improved.

The invention discloses a high-length-diameter-ratio heterogeneous electron carrier sheet stack structure and a manufacturing method thereof, and relates to the technical field of substrate manufacturing. Comprising an upper plate, the lowest layer of which is provided with a metal conductive column; a through first through hole is formed in the lower plate; the dielectric layer is provided with a pre-drilling hole; wherein the line width, the line distance, the line thickness and the welding pad thickness of the upper plate are smaller than the line width, the line distance, the line thickness and the welding pad thickness of the lower plate; the layer number of the upper plate is greater than that of the lower plate; the diameter of the metal conductive column is smaller than that of the first through hole, and the diameter of the first through hole is smaller than that of the pre-drilled hole; a hole is formed in the dielectric layer on the lower layer of the lower plate, and the hole exposes the end face of the metal conductive column and then forms a blind hole; through the size matching of the metal conductive columns, the through holes and the pre-drilled holes and the structural design of the blind holes, collaborative optimization of high-density interconnection and structural stability is achieved, and the method has the advantages that the depth-to-width ratio is increased, the structural stability is enhanced, the thermal management efficiency is optimized, and interface defects are reduced.

The invention provides a glass substrate, a preparation method thereof and a chip packaging structure. The glass substrate comprises a glass substrate, at least one first hole section and at least one second hole section are arranged in the glass substrate, and the first hole section is communicated with the second hole section; the glass substrate has a first surface and a second surface which are oppositely arranged, an opening of the first hole section is located in the first surface, and an opening of the second hole section is located in the second surface; the glass substrate is made of glass; the first seed layer is located in the first hole section, a first blind hole is defined by the first seed layer, and an opening of the first blind hole faces the side where the first surface is located; the first conductive part is located in the first blind hole; and the second conductive part is positioned in the second hole section.

The invention relates to the technical field of chip embedded module packaging, in particular to a blind hole processing method and a substrate. An embedded chip substrate is prepared, a chip is embedded in the embedded chip substrate, and the chip is covered with an insulating layer; determining a hole opening position on the insulating layer, wherein the hole opening position corresponds to the embedding position of the chip on the chip embedding substrate; laser ablation is conducted on the hole opening position through ultraviolet laser according to preset laser parameters, so that an initial blind hole is machined in the hole opening position; and performing residue removal processing on the initial blind hole through plasma equipment to obtain a target blind hole. Therefore, the initial blind hole is machined in the hole opening position through the ultraviolet laser, molecular bonds can be directly destroyed, cold ablation is achieved and thermal damage is reduced on the basis of the characteristic that photon energy of the ultraviolet laser is high, meanwhile, the target blind hole with the smooth hole wall can be obtained by conducting residue removing treatment on the initial blind hole through plasma equipment, and the hole opening precision is improved. Compared with the prior art, high-precision and high-quality machining of the blind hole is achieved.

The invention discloses a method for manufacturing a surface flexible layer rigid-flexible combined board for an intelligent video module, which comprises the following steps of: taking a double-sided flexible copper-clad plate, and windowing a first surface copper layer corresponding to a first via hole to form a flexible core board; taking the first cover film and windowing corresponding to the first via hole to form a windowing cover film; correspondingly attaching the windowing covering film to one side of the second copper layer of the flexible core plate to form a covering film core plate; taking a prepreg, manufacturing a glue-blocking film corresponding to a flexible area of the prepreg, forming a glue-blocking prepreg, and manufacturing a rigid core plate; sequentially stacking and laminating the plates from top to bottom, enabling the glue blocking film to face the covering film core plate, then manufacturing a through hole in the rigid region, performing laser ablation on an insulating medium layer corresponding to a copper layer windowing pattern, electroplating, performing uncovering processing, removing a second copper layer at the bottom of a blind hole, forming a first via hole, and performing molding to form the rigid-flexible combined plate. The metallization process of the flexible area and the metallization process of the rigid area are combined into one-time electroplating, so that the consistency of the thickness of a copper plating layer is ensured.

The invention discloses a self-tightening spring (1) which is characterized in that a bolt hook (2) is arranged at one end of a tension spring main body (24) and is linear, and a nut hook (3) is arranged at the other end of the tension spring main body (24) and is an L-shaped inverted-inserting hook. The matched bolt (6) is characterized in that the tail end of a common bolt is provided with a bolt hook hole (4), and the bolt hook hole (4) is a radial through hole into which a bolt hook (2) can be inserted. The nut is characterized in that at least one nut hook hole (5) and a blind hole parallel to the hexagonal side face and the end face of the nut at the same time are formed in the hexagonal side face of a common nut. The invention further discloses an anti-loosening thread pair (25), which is characterized in that the bolt hook (2) is inserted into the bolt hook hole (4), the nut hook (3) is lengthened and inversely inserted into the nut hook hole (5), the tension spring body (24) is screwed around the screw rod (7) to tighten the nut (9) and the bolt (6), energy is continuously compensated, loosening displacement of the thread pair is self-tightened, and the purpose of never loosening is achieved.

The invention relates to the technical field of hard rock drilling construction, in particular to a rock breaking hob, a shield tunneling machine cutterhead and a shield tunneling machine. The rock breaking hob comprises a cutter shaft, an annular cutter body and a plurality of pressurizing assemblies; an annular cavity communicated with an external high-pressure water source is formed in the cutter shaft; the annular cutter body is rotationally arranged on the cutter shaft, and a plurality of blind holes are formed in the annular cutter body; the pressurizing assembly comprises a compression block, a plugging block and a first elastic piece; the compression block is in sealed sliding connection with the inner wall of the blind hole to form a compression cavity, and a plurality of first channels used for communicating the compression cavity with the annular cavity are formed in the annular cutter body; a sliding groove, a communicating hole and a water spraying hole are formed in the compression block; the sliding groove communicates with the compression cavity through the communicating hole. The sliding groove communicates with the end face of one end of the compression block through the water spraying hole. The plugging block is slidably connected with the sliding groove and blocks the water spraying hole when located at the end, close to the central axis of the annular cutter body, in the sliding groove. The first elastic piece is used for enabling the compression block to pop out of the blind hole. The rock breaking device has the effects of reducing water source waste and improving the rock breaking efficiency.

The invention relates to the technical field of TGV substrates, in particular to a TGV substrate structure which comprises a TGV substrate, a plurality of glass through holes are formed in the TGV substrate, and filling copper for interconnection of multiple layers of TGV substrates is arranged in each glass through hole; the blind holes are arranged around each glass through hole and are used for buffering thermal expansion of the filling copper; and the filling film is arranged in the blind hole and is matched with the blind hole to buffer the thermal expansion of the filling copper. The blind hole is formed around the glass through hole, the filling film is arranged in the blind hole, and the hole structure and the filling film are utilized to buffer deformation of the TGV substrate under the condition that the filling copper is heated and expanded, so that the possibility that the TGV substrate cracks and even chippings are generated due to the fact that the heating expansion amount of the filling copper is larger than the expansion amount of the TGV substrate is reduced, the safety of the TGV substrate is guaranteed, and the production efficiency of the TGV substrate is improved. And therefore, the safety and the use stability of the TGV packaging chip can be ensured.

The invention discloses a conductive paste, a metallized substrate and a metallization process for manufacturing the metallized substrate, the conductive paste comprises metal particles, the particle size of the metal particles is 0.1-10 [mu] m, and the mass ratio of the metal particles is 80-98%; in the metallization process, a copper layer is arranged on the hole wall of a through hole or a blind hole of a substrate, then conductive slurry is filled in the hole with the copper layer, heating sintering treatment is carried out, and after heating sintering is carried out in an inert gas atmosphere at the temperature of less than or equal to 300 DEG C, metal particles can be fused to form a connection structure or a eutectic structure. A reinforcing layer can be formed between the nano metal particles and the copper layer, and the reinforcing layer is a metal bonding layer or an intermetallic compound layer. The metallization mode is suitable for a through hole or a blind hole of a glass / silicon / ceramic substrate with a high aspect ratio and a micro aperture, and the technical problems that complete filling is difficult to achieve and filling defects exist in an existing electroplating process, the electrical resistivity of conductive paste is high, and the interface bonding force is insufficient can be solved.

The invention discloses a pre-stressed concrete precast pile with an end plate and additional mechanical connection, which comprises a pre-stressed steel bar, a concrete pile body, the end plate and a mechanical connection assembly mounted on the end plate, and the mechanical connection assembly comprises an insertion rod, a bushing, a plurality of occlusion petals and a compression spring, a blind hole corresponding to the mechanical connecting assembly is formed in the end face of the concrete pile body, an opening of the blind hole communicates with the mounting hole, the lining is in threaded connection with the mounting hole, a plurality of occlusion petals are arranged in an inner space formed by the lining and the blind hole, and compression springs are arranged between the occlusion petals and the end face of an inner cavity of the blind hole. When the adjacent prestressed concrete precast piles with the end plates in additional mechanical connection are connected, the end plates provided with the inserting rods are close to the end plates provided with the bushings, the inserting sections penetrate through the bushings to be inserted into the occlusion petals, and then the end plates are welded. According to the prestressed concrete precast pile with the end plates and the additional mechanical connection, the pile head strength is guaranteed, and meanwhile the corrosion resistance and the connection strength of connection between piles are improved.

The utility model discloses a wall breaking device for breaking a perforation compaction layer of an oil and gas well, and relates to the technical field of petroleum perforation, the wall breaking device comprises a perforating gun, a bullet rack, a perforating bullet, an acting device and a detonating cord, the acting device is detachably installed at an opening of the perforating bullet, the head of the acting device is filled with energy particles arranged in multiple layers, and the detonating cord is connected with the perforating gun. A positioning clamping ring is installed in the shell and used for adjusting the distance between the energy particles and the blasting powder. Compared with the prior art, the multi-layer charging structure can enable particles to be fully rubbed and impacted in the pore channel, a more violent acting effect is triggered, and the pore channel without compaction pollution is generated. In addition, due to the design of the positioning clamping ring, the perforating bullet can be kept at the end away from the blind hole all the time, larger burst height is obtained for jet flow, and the technical problems that a traditional perforating hole channel is narrow and blocked, and compaction pollution exists in the hole channel are effectively solved.

The invention discloses a 3D packaging structure and a manufacturing method thereof, and the method employs a glass wafer as a first carrier plate, and solves the problems of reliability and signal interference caused by the mismatching of thermal expansion coefficients of an organic material adapter plate and a Si-based silicon bridge chip. In S1, a blind hole is etched by taking a glass wafer as a base material, and Cu is metallized and filled, and the thermal expansion coefficient of glass is similar to that of a silicon bridge, so that the risk of thermal stress deformation is reduced. And S2, through groove etching, temporary carrier plate bonding and thinning, a through groove hole is formed, and the rigid structure of the glass carrier plate maintains the stability of the packaging structure during high-density integration. And S3, the silicon bridge Die is embedded into the through groove hole, the low thermal expansion characteristic of the glass is well matched with the silicon bridge, the interface stress is reduced, the dielectric property of the glass support plate is excellent, the signal dielectric loss is reduced, and the signal integrity is improved by matching with the silicon bridge Die. And S4, after the functional chip is mounted on the adapter plate, the glass-based adapter plate ensures reliable connection, signal attenuation distortion is inhibited, and a reliable packaging scheme is provided for high-density integration.

The invention relates to the technical field of casting molds, in particular to a high-precision wax mold forming mold for a complex-structure casting, which comprises a first outer mold, a second outer mold, a bottom mold and a top mold, a first inner module and a second inner module are arranged in the first cavity; the parting surface of the second outer mold and the first outer mold is arranged along the side part of the outer arc surface of the lower bracket of the air bag; the bottom die is connected with the first outer die and the second outer die in a clamped mode, a first through hole is formed in the bottom die, a first inserting rod is inserted into the first through hole, and the first inserting rod penetrates through the bottom die to be connected with first blind holes in the bottoms of the first inner die block and the second inner die block in an inserted mode. And the top die is matched with the end parts of the first inner die block, the second inner die block and the second outer die. Through reasonable design of the wax mold structure, one-time integral forming of the air bag lower support of a complex structure is achieved, meanwhile, smooth demolding of a wax mold is guaranteed, and the wax mold forming efficiency and quality are improved.

The utility model belongs to the field of medical equipment and relates to a radiotherapy positioning gold label loader which comprises a handheld base, a loading device and a positioning device are arranged on the upper portion of the handheld base, and a guide nozzle is arranged on the lower portion of the handheld base. The loading device comprises a loading body and a cover body, the cross section of the loading body is in a regular hexagon shape, a rotating shaft is arranged on the handheld base, and the loading body is installed on the rotating shaft; a containing cavity is formed in the loading body and penetrates through the height direction of the loading body; the cover body is arranged on the upper side of the loading body and fixedly connected with the rotating shaft, and a through hole is formed in the cover body and right faces the guide nozzle; the positioning device is arranged on one side of the loading device, a blind hole perpendicular to the side face of the loading body is formed in the positioning device, a fixing column is arranged in the blind hole, and a spring is arranged between the fixing column and the blind hole; and when the positioning device is relatively fixed with a certain side surface of the loading body, the accommodating cavity is arranged opposite to the through hole and the guide nozzle. The device can be matched with implanted gold labels and is simple in structure and convenient and smooth to operate.

The invention provides a cutting line of a metal mask. The cutting line is formed by alternately arranging a first etching blind hole row and a second etching blind hole row along the length direction of the cutting line, the first etching blind hole row comprises an odd number of etching blind holes, and the second etching blind hole row comprises an even number of etching blind holes; the cutting line is provided with a center line along the length direction of the cutting line, and the first etching blind hole row and the second etching blind hole row are symmetrical about the center line. By means of the arrangement, the cutting line can have certain strength, the metal mask cannot be snapped near the cutting line when the metal mask is subjected to net stretching, the metal mask can be flatly torn along the cutting line when the metal mask is split along the cutting line, and an effective area is not damaged; and the stress near the cutting line on the metal mask plate can be gradually transited, so that the swelling phenomenon is reduced.

The utility model discloses a lead plaster transfer transition frame for cross-line production. The lead plaster transfer transition frame comprises a shell, supporting legs are arranged at the bottom of the shell, a driving shaft is rotationally connected to the inner side of the shell, a chain wheel is fixedly connected to the outer wall of the driving shaft, a chain is connected to the outer wall of the chain wheel in a meshed mode, and a scraping assembly is arranged on the chain. The scraping assembly comprises a connecting plate fixed to the outer wall of the chain, a limiting rod is inserted into a blind hole in the bottom side of the connecting plate, the limiting rod is slidably connected with the connecting plate, one end of the limiting rod is fixedly connected with the scraping plate, blind holes are formed in the bottom side of the connecting plate, the blind holes are located in the two sides of an electromagnet, and the electromagnet is embedded in the bottom of the connecting plate; the lower end of the connecting plate is sleeved with a scraper, an adjusting spring is fixedly connected into the scraper, one end of the adjusting spring is fixedly connected with the bottom of the connecting plate, and the electromagnet is in magnetic adsorption connection with the scraper. According to the device, the problem that lead plaster remains at the bottom of the shell can be avoided, so that waste of the lead plaster is avoided, and the difficulty of equipment maintenance is reduced.

The invention provides a package carrier and a preparation method thereof, and the package carrier comprises a first substrate which comprises a first through hole, a first conductive column and a seed layer, the first conductive column and the seed layer are located in the first through hole, and the seed layer is located between the first conductive column and the hole wall of the first through hole; the second substrate is arranged on one side of the first substrate and is in contact with the first substrate, the second substrate comprises a second through hole and a second conductive column filled in the second through hole, and the second conductive column is in contact with the hole wall of the second through hole; wherein the first through hole and the second through hole are at least partially communicated, and the first conductive column and the second conductive column are electrically connected at the contact interface. According to the invention, the first substrate and the second substrate are stacked and contacted, and high-difficulty manufacturing of the through hole is decomposed into respective filling of the low-aspect-ratio through hole and the blind hole, so that the manufacturing difficulty of the high-aspect-ratio through hole is reduced, and the filling effect is improved.

The embodiment of the invention provides a packaging substrate laser drilling method and a packaging substrate, the packaging substrate comprises a first copper layer, a dielectric layer and a second copper layer which are stacked in sequence, and the method comprises the steps that first drilling operation is carried out with first laser energy, and an annular area is ablated on the first copper layer; second drilling operation is conducted through second laser energy, the copper cover in the middle of the annular area and part of the dielectric layer are removed, a blind hole is formed, and the second laser energy is smaller than the first laser energy; third drilling operation is carried out with third laser energy, the dielectric layer at the bottom of the blind hole is removed until the second copper layer is exposed out of the bottom of the blind hole, and the third laser energy is smaller than the second laser energy. According to the packaging substrate laser drilling method, on the premise that the laser drilling quality requirement is met, the laser drilling machining efficiency can be improved.

The invention relates to the technical field of titanium alloy investment precision casting, and particularly provides a titanium alloy multistage deep blind hole investment casting method which comprises the following steps: designing an exhaust hole and a slag removal hole; establishing a model; assembling and welding; soaking the surface layer in a vacuum negative pressure environment, continuously vacuumizing, deflating after soaking, taking out the module, and rotating to uniformly control the slurry; preparing a surface layer; performing segmented grouting on the deep blind hole; making a shell from a back layer; roasting and molding; washing and drying; pouring is conducted; shell cleaning and sand blasting; sealing and welding the process holes; and performing stress relief annealing. And a dynamic vacuumizing means is adopted, and a vacuumizing device is always kept in an open state, so that the compactness of a surface layer is improved, and burrs of a casting are reduced. Through vacuum dynamic slurry immersion, segmented grouting and collaborative design of the exhaust hole and the slag removal hole, investment precision casting forming of the high-precision oil pump shell can be supported, the shell manufacturing efficiency of the multi-stage deep blind hole is improved, and the filling defect rate is reduced.

The utility model relates to a pushing construction auxiliary device which comprises a connecting block, a supporting plate is arranged at the upper end of the connecting block, a hemispherical block is fixed to the middle of the lower end face of the supporting plate, a hemispherical groove is formed in the middle of the upper end face of the connecting block, a plurality of first blind holes are evenly formed in the upper end face of the connecting block along the circumference, and a pushing block is arranged in each first blind hole. A second blind hole is formed in the lower end face of the connecting block, a piston block is arranged in the second blind hole, the upper end of the second blind hole communicates with the lower end of each first blind hole, and a cavity between the piston block and each ejector block is filled with hydraulic oil. Hydraulic oil in the first blind hole cannot flow back into the second blind hole; the supporting plate and the hemispherical block can freely rotate on the groove, so that the supporting plate can be attached to the box girder under the condition that the lower end face of the box girder is uneven or low in levelness, the contact area between the supporting plate and the box girder is increased, and the jacking effect of the jack is more stable.

The invention relates to a radio frequency coaxial connector with an automatic compensation structure. The radio frequency coaxial connector is used for direct insertion-screwing tool-free field installation of a smooth copper-clad aluminum pipe radio frequency cable. The connector shell is composed of a rear threaded shell body, a middle threaded shell body and a front threaded shell body, a blind hole is formed in the rear portion of the inner conductor, and the core wire can float in the hole to avoid crushing. According to the radio frequency coaxial connector with the automatic compensation structure, the rear portion of the inner conductor is supported by means of the two insulation supports of the insulation assembly, and in the process that the cable core wire is inserted into the insertion hole of the inner conductor, the cable core wire is inserted into the insertion hole of the inner conductor. Impedance can be automatically compensated, so that impedance matching of a product is guaranteed, and the voltage standing-wave ratio is reduced; and the insulation support of the product is not an inverted cone type tightening structure in the prior art, but clamps the cable core wire in a sliding manner, so that the stress of the connector insulator adopting the structure is relatively small, and the situation that the inner conductor cannot tighten the cable due to deformation is avoided.

The invention relates to the technical field of aero-engine monitoring, in particular to a method for measuring the rotating speed of a microminiature turbine engine. Comprising the following steps that an axial blind hole is formed in the circumferential outer edge of a rotating part bearing pressing block, and a cylindrical magnet is embedded in the blind hole; the impeller rotating coaxially presses the open end of the blind hole of the bearing pressing block, so that the cylindrical magnet is restrained between the bottom of the blind hole and the impeller; fixing a Hall sensor on a bearing seat of the stator component, and enabling the sensing surface of the Hall sensor to directly face the outer edge opening area of the bearing pressing block; when the bearing pressing block rotates along with the rotating shaft, the Hall sensor detects the periodic magnetic field change generated when the cylindrical magnet sweeps and outputs a pulse signal; calculating the rotating speed value of the engine according to the pulse signal frequency and the number of the magnetic columns: RPM = (f * 60) / N; or calculating the rotating speed value of the engine according to the time interval dt of the N pulse signals: RPM = 60 / dt. According to the invention, high-precision, low-cost and non-contact rotating speed measurement of the microminiature turbine engine is realized.

The utility model discloses an endoscope holding device, and relates to the technical field of endoscope auxiliary tools. The device comprises a pipe body and a clamping piece, wherein a first hole and a second hole are formed in the middle of the pipe wall of the pipe body; the first hole is a through hole, and the second hole is a through hole or a blind hole formed in the inner side of the pipe wall of the pipe body. The first hole and the second hole are symmetrically arranged relative to the middle axis of the pipe body; the clamping piece is inserted into the first hole and the second hole; a third hole is formed in the middle of the clamping piece, the third hole is a through hole, and the third hole is communicated with the channel in the pipe body; an elastic piece is arranged between the clamping piece and the pipe wall of the pipe body, and the elastic piece controls the third hole and the channel in the pipe body to be coaxially or non-coaxially arranged.

The utility model discloses an ultrasonic flowmeter module which comprises a module body and a cover plate, the module body is in a cuboid shape, the left end and the right end of the module body are respectively provided with two transducer installation areas, the middle of the module body is provided with a control module circuit board installation area, and the cover plate is arranged on the upper surface of the module body. Each transducer mounting area comprises a cylindrical barrel, a closed blind hole is formed in the bottom of the barrel, the upper part of the barrel is closed through a cover plate, a through hole I is formed in the position, corresponding to the transducer, of the cover plate, a plurality of screw holes I are formed in the periphery of the barrel, and the control module circuit board mounting area comprises a cuboid frame body; a cavity is arranged between the frame body and the cover plate, the cavity is communicated with the barrel bodies on the two sides respectively to form an inverted-concave-shaped communicated cavity, the two ends of the control module circuit board extend into the barrel bodies respectively, a second through hole is formed in the upper surface of the cover plate at the corresponding position of the frame body, and a cylindrical terminal groove is formed in an opening of the second through hole. The terminal grooves protrude out of the surface of the cover plate. According to the utility model, the energy converter is prevented from being directly contacted with gas or liquid in the pipe section through the design of the blind hole, and the waterproof performance of the module is improved.

The invention relates to a cable laying traction structure and a mounting method, the structure comprises a traction inner sleeve, a traction outer sleeve and a compression nut, the traction outer sleeve comprises an outer sleeve, one end of the outer sleeve is provided with a mounting hole, the traction inner sleeve comprises an inner sleeve coaxially arranged with the outer sleeve, and the inner sleeve is provided with a mounting hole. One end of the inner sleeve is detachably fixed in the mounting hole, a blind hole is formed in the other end of the inner sleeve, a circular-truncated-cone-shaped pressing part is arranged on the outer side of the opening end of the blind hole, the pressing nut comprises a hexagonal section and a sealing section matched with the mounting hole, the hexagonal section and the sealing section are coaxial, and the sealing section is installed in the mounting hole in a threaded mode. A pressing hole matched with the pressing part is formed in the sealing section, a cable via hole communicated with the pressing hole is formed in the hexagonal section, a cable core of the cable penetrates through the cable via hole and is inserted into the blind hole, the outer side of the cable core is sleeved with a protective sleeve, and the protective sleeve is pressed between the pressing hole and the pressing part in a sealed mode. Compared with the prior art, the sealing structure has the advantages of good sealing effect, high reliability and the like.

The invention discloses an all-in-one machine for double-end machining of blind holes, key grooves and anti-theft buckles of an oil field perforating gun and a machining method. The all-in-one machine comprises a machine tool, an electric control cabinet, a roller lifting system, a self-centering clamp, a main clamping mechanism, a starting end integrated machining mechanism and a tail end integrated machining mechanism, wherein the roller lifting system, the self-centering clamp, the main clamping mechanism, the starting end integrated machining mechanism and the tail end integrated machining mechanism are installed on the machine tool. A main chuck on the main clamping mechanism moves in the longitudinal direction of the machine tool and is used for pushing the oil field perforating gun to be positioned and clamping and rotating the oil field perforating gun. A milling cutter assembly, a blind hole machining machine and an anti-theft buckle machining machine are sequentially arranged on the starting end integrated machining mechanism from inside to outside. The tail end integrated machining mechanism is sequentially provided with an anti-theft buckle machining machine, a blind hole machining machine, a milling cutter assembly and a pipe length measuring assembly from inside to outside. All the components are ingeniously combined and reasonably arranged and matched for use, integrated machining of double-end blind holes, key grooves and anti-theft buckles of the oil field perforating gun is achieved, synchronous operation of equipment at the starting end and equipment at the tail end is achieved, and the machining efficiency is improved due to simultaneous machining of the double ends while the machining precision is guaranteed.

The invention discloses a large-size carbon fiber composite material wallboard precise hole making process method, and relates to the field of aviation composite material wallboard hole making, and the method comprises the steps that a chip containing space extending in the axial direction is machined in a preset hole position of a composite material wallboard forming mold, and the chip containing space is of a blind hole structure; the chip containing space is filled with a sacrificial layer material matched with thermal expansion, and the difference value between the thermal expansion coefficient of the sacrificial layer material and the forming mold and the composite material is smaller than a preset threshold value; the composite material wallboard is kept in a non-demolding state after being cured, and the wallboard and the forming mold are integrally positioned to machining equipment; establishing a processing coordinate system based on the reference features of the forming die; and a multi-cutting-edge tool is adopted for drilling the wall plate with the mold, so that the tool penetrates through the composite laminated plate and cuts the sacrificial layer material, and the tail end of the tool does not make contact with a forming mold body. According to the scheme, the precision of the connecting hole site of the composite material wallboard can be ensured, and the demolding deformation error, the outlet layering damage and the secondary clamping cost are synchronously eliminated.