616 results about "Counterbore" patented technology

The invention relates to the technical field of semiconductor packaging and cooling, and particularly discloses a diamond-copper composite micro-channel-based cooling and packaging structure which comprises a packaging shell and a diamond-copper heat conduction plate with the bottom in floating lap joint through an elastic sealing ring. A plurality of heat exchange stand columns are integrally formed on the upper surface of the heat conduction plate, and the heat exchange stand columns are inserted into the containing counter bores of the packaging shell to form micro-channel annular gaps. A piezoelectric vibration plate dividing the medium cavity into a storage cavity and a jet flow cavity is integrated in the packaging shell, and the jet flow cavity communicates with a flexible connecting pipe section arranged over the heat exchange stand column in a suspended mode. Spiral fins are arranged on the surfaces of the heat exchange stand columns, horn-shaped flow guide pieces are arranged at orifices of the containing counter bores, and C-shaped groove flow guide fins which are arranged in a staggered mode are arranged on the bottom face of the heat conduction plate. According to the invention, low-thermal-resistance, high-flux and high-reliability direct contact type active heat dissipation for a high-power-density device is realized.

The present application belongs to the technical field of aircraft assembly, and provides a device and method for controlling the depth of a counterbore of an engine suspension fastener hole. The device is used in the process of drilling an engine suspension fastener hole and counterbore, and controls the depth of the counterbore. The device is composed of a micrometer, a sensor and a tool holder. The micrometer is fixed on the tool holder, and the end of the micrometer is a flat surface. The working end of the sensor is a half-spherical surface, which can be compressed. The tool holder moves with the deepening of the counterbore depth, so that the end surface of the micrometer and the sensor are in contact and the sensor is compressed. When the compression reaches a certain depth, the sensor triggers, the device stops the counterbore, the tool exits the product, and the assembly part is automatically counterbored to the required size. The present application can automatically control the depth of the counterbore of the assembly part and the part.

The invention discloses a rigid casing stabilizer and relates to the technical field of oil field low-carbon exploitation. An annular counter bore is upwards formed in the lower end face of the centralizing sleeve, a lifting sleeve is arranged in the annular counter bore and connected with the annular counter bore through threads, the upper portion of the lifting sleeve is connected with a compression spring A through a plane bearing, the upper portion of the compression spring A abuts against the bottom of the annular counter bore, and a balance cutting mechanism is arranged on the lower portion of the lifting sleeve. The drilling tool has the beneficial effects that the balance cutting mechanism is arranged on the lower portion of the centralizing sleeve, when the well diameter is irregular during casing running and the main cutting block and the auxiliary cutting block encounter the inner protrusion of the well wall, the lifting sleeve starts to rotate and ascend, the main cutting block and the auxiliary cutting block cut the well wall, the casing can be smoothly put into a shaft, and the drilling tool is convenient to use. And during cutting, large bending force cannot be formed on the casing pipe, so that the casing pipe is protected.

The invention discloses a rubber O-shaped ring compression stress relaxation test device which comprises an O-shaped ring mounting base, four circles of annular grooves are sequentially formed in the center of the O-shaped ring mounting base from outside to inside, a rubber O-shaped ring is arranged in the fourth circle of annular groove, a gasket is arranged above the rubber O-shaped ring, a force measuring sensor is arranged on the gasket, and the force measuring sensor is connected with the O-shaped ring mounting base. The force measuring sensor is tightly connected with the O-shaped ring mounting base through a fixing piece and a plurality of counterbores; the force measurement sensor is in wireless or wired connection with the data acquisition system; two flow guide holes and a temperature measuring hole are formed in the groove bottom of the second ring of annular groove, a temperature measuring sensor is inserted into the temperature measuring hole, the head of the temperature measuring sensor penetrates into the second ring of annular groove, and the tail of the temperature measuring sensor is connected with a thermodetector through a temperature measuring data connecting line; the oil temperature machine is communicated with the two flow guide holes through an oil conveying pipeline, and an oil pump is arranged on the oil conveying pipeline. The environment temperature of the rubber O-shaped ring can be controlled, and the actual working condition of the rubber O-shaped ring in lubricating oil can be simulated.

The utility model provides a mechanical arm mechanism, cleaning equipment and a cleaning system, and relates to the technical field of cleaning equipment. The mechanical arm mechanism comprises a mechanical arm, a rotating joint, a manipulator and a wire harness, the mechanical arm comprises a mechanical arm body and a first driver, the first end of the rotating joint is connected with the first driver, a counter bore extending towards the first end is formed in the second end of the rotating joint, and an avoiding groove extending in the circumferential direction by a preset radian is formed in the peripheral face of the rotating joint; the manipulator comprises a main body part, a second driver, a first clamping jaw and a second clamping jaw, the first clamping jaw and the second clamping jaw are rotationally connected with the first end of the main body part, and the second driver is configured to drive the first clamping jaw and the second clamping jaw to be switched between an opening state and a clamping state; the second end of the main body part is fixedly connected with the second end of the rotary joint, and an accommodating space formed by the main body part is communicated with the counter bore; one end of the wire harness is located on the mechanical arm, and the other end of the wire harness extends to the mechanical arm after penetrating through the counter bore in the rotating joint and the receding groove.

The present application relates to a kind of laminated U-shaped shape memory alloy damper, belong to structural vibration control technical field.Laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b are connected together including connecting piece a, connecting piece b;Connecting piece a both ends are provided with counterbore a, connecting piece b both ends are provided with counterbore b, counterbore a and counterbore b are all provided with counterbore bolt;Laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b are all combined by multiple U-shaped shape memory alloy sheet and multiple U-shaped rubber pad layer;Connecting piece a and connecting piece b end recess have square groove, the end of laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b is equipped with opening, the end of laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b is inserted into the square groove, and be connected together by multiple counterbore bolt.The present application effectively solves the problem of energy consumption and deformation.

The advection sealing valve comprises a valve body, valve covers are fixedly connected to the two axial ends of the valve body, an input port and an output port are formed in the valve body, a valve seat dividing an inner cavity of the valve body into two valve chambers is fixedly arranged in the valve body, a valve port is formed in the valve seat, and the input port and the output port communicate with the two valve chambers correspondingly; the valve further comprises a sealing piece located in the valve chamber, the sealing piece comprises a valve rod extending in the axial direction and a valve head set in sealing fit with the valve seat, a first counter bore and a second counter bore are sequentially inwards formed in the end, facing the valve seat, of the valve head set, the diameter of the first counter bore is smaller than that of the second counter bore, and a flat pressing hole communicated with the second counter bore is formed in the side wall of the valve head set. A balance valve head in sealing fit with the first counter bore is arranged in the second counter bore, one end of the valve rod is fixedly connected with the balance valve head, and the other end of the valve rod penetrates through the valve deck and extends to the outside. Wear parts can be replaced conveniently, and opening and closing of the valve head set are smoother and labor-saving by balancing internal and external pressure of the valve head set.

The utility model provides an angle grinder press plate and an angle grinder wrench, which comprise a circular press plate body, the center of the press plate body is provided with an internal threaded hole, and the upper side surface of the press plate body is uniformly provided with a plurality of polygonal counter bores to form a multi-surface contact structure of the press plate and the wrench so as to effectively prevent slipping during assembly and disassembly. The distances between the polygonal counter bores and the center of the nut body are equal. The polygonal counter bore is formed in the angle grinder pressing plate and is matched with the angle grinder wrench with the polygonal stud, so that a multi-surface contact structure of the polygonal counter bore and the polygonal stud is formed.

The utility model discloses an integral lifting structure of an electric medical bed, which belongs to the field of lifting structures and comprises two groups of support plates, a transverse column is detachably arranged on the two groups of support plates, and an H-shaped structure is formed between the two groups of support plates and the transverse column. According to the overall lifting structure of the electric medical bed, the supporting plate is installed on the electric medical bed, the bottom pipe penetrates through the transverse shaft of the electric medical bed in sequence, so that the supporting plate can be rapidly and integrally installed, the installing plate can be rapidly and integrally connected with the transverse plate of the electric medical bed through the two sets of installing holes, and the whole lifting structure is convenient to use. Firstly, insertion of the positioning bolt to the extension plate and the supporting plate is removed, the extension plate is pulled upwards, the overall longitudinal length of the supporting plate can be increased, then the positioning bolt sequentially penetrates through the first counter bore and the second counter bore, and the positioning nut is screwed to abut against the supporting plate.

The utility model relates to the technical field of microelectronic packaging application, in particular to a tool for welding a light window and a porcelain body, which comprises a welding base, a pressing plate upper cover and a pressing block core, a groove is arranged at the center of the welding base, round corners are arranged at four corners of the groove, a first through hole is arranged on the welding base, and a second through hole is arranged on the pressing plate upper cover. A groove is formed in the welding base, a first through hole is formed in the welding base, the first through hole is located on the two sides of the groove, a counter bore is formed in the bottom of the welding base and communicated with the first through hole, a second through hole is formed in the center of the pressing plate upper cover, and a third through hole is formed in the pressing plate upper cover. The light window is ensured to be uniformly and flatly attached to the welding surface of the porcelain body, the reliability of product packaging is ensured, and meanwhile, a more excellent welding environment is provided for a subsequent transparency process.

A fuel injector body includes a body comprising an at least partially annular configuration defining a longitudinal axis, a circumferential direction, and a radial direction. A first counterbore and a first cavity extend from a first end toward a second end, and an outer interface portion includes a sealing surface axially disposed between the first end and a shoulder. The first cavity defines a floor surface and an outer peripheral surface, and the body further includes a leakage passage extending from the floor surface, the leakage passage being in communication with the first cavity.

The invention discloses a machining device and method for an annular eccentric spigot part. The machining device comprises a bottom plate, a pin is arranged in the middle of the bottom plate, the annular eccentric spigot part is arranged on the bottom plate, and the annular eccentric spigot part is connected and fastened to the bottom plate through screws. The machining device is used for positioning and aligning to machine phi D1 and phi D2 so as to guarantee the dimensional precision of the phi D1 and phi D2 and the dimensional precision of the eccentric distance L between the centers of the phi D1 and phi D2 and the center of phi D. The machining device has the advantages that the requirement for machining equipment is not high, small and medium-sized machining factories have the equipment capacity, and the machining device can be used in cooperation with existing equipment for machining. And meanwhile, the machining efficiency is high, the machining cost is low, the requirement for equipment operation skills is not high, the machining quality is easy to guarantee, and meanwhile a thought for solving problems is provided for machining of similar parts.

The utility model discloses a protective device for a fiber bragg grating rotating wheel strain sensor of a water-turbine generator set, which comprises a base and a waterproof cover, and a placing groove is arranged between the base and the waterproof cover for accommodating the strain sensor. The two ends of the waterproof cover are provided with optical cable holes and optical cable ends, and the adjacent optical cable holes are connected through optical cable protection tubes. The base comprises a fixed end and an inner boss, a sealing groove on the top surface of the fixed end is matched with a sealing ring, the connecting end is provided with an outer boss, the fixed end and the connecting end are connected through a fixed bolt and waterproof sealant, a sealing cavity filled with sealant is arranged in the waterproof cover, the threaded connection part of the optical cable protection tube is filled with sealant, and the waterproof cover is provided with a spiral drainage groove. The device has the advantages that the sealant is waterproof, the sensor is dry and the precision is improved; the convex surface end disperses impact force, the service life of the device is prolonged, and the protection effect of the device is improved; fixing bolts, sealants and counterbores are designed to enhance waterproofness; the spiral drainage grooves conform to water flow, and impact is reduced; the optical cable protection tube is connected in series to protect the sensor, the hose end is attached to the rotating wheel, and the tube fixing seat ensures that the optical cable is stable and well matched with the rotating wheel.

The utility model relates to the technical field of sand material detection, in particular to a building sand density detection device which comprises a fixing table, a groove is formed in the fixing table, a material storage frame is arranged in the groove, water filtering holes are formed in the side wall of the material storage frame, a lantern ring is fixedly arranged at the top of the material storage frame, the outer diameter of the lantern ring is larger than or equal to the diameter of the groove, and a collecting groove is formed in one side of the fixing table. A measuring cup is arranged in the collecting groove, a flow guide pipe is arranged at the top of the collecting groove, the two ends of the flow guide pipe are communicated with the groove and the collecting groove, the fixing table is provided with a set of counter bores in the two sides of the groove respectively, electric push rods are fixedly arranged in the counter bores, and output shafts of the electric push rods are fixedly provided with connecting bases. According to the device, a worker can drive the material storage frame and sand in the material storage frame to ascend and descend by starting the electric push rods on the two sides of the fixed table, so that the worker can conveniently carry out multiple times of measurement, and the detection efficiency is improved.

This invention relates to a mold frame for anti-rotation of ejector pins with countersunk heads, applicable to the field of mold ejector pin technology. It includes a lower mold, an ejector sleeve, an ejector pin, an anti-rotation groove, a countersunk head, a lifting bolt, an ejector plate, an assembly hook, and a spring ring. The spring ring is sleeved with the countersunk head. This structure allows for the extension and retraction adjustment of the ejector sleeve, facilitating the installation of ejector pins in different molds. When the ejector pin retracts back into the ejector sleeve, the ejector plate is pulled downwards by a power device, causing the spring ring on the assembly hook to apply a downward pulling force to the countersunk head. The elastic deformation of the spring ring counteracts the difference in extension and retraction height between different ejector pins, enabling the ejector plate to synchronously drive the extension and retraction of multiple sets of ejector pins, effectively improving the mold demolding efficiency.

The utility model discloses a stable installation's rail transit forging hoop structure belongs to the technical field of hoop, a stable installation's rail transit forging hoop structure, including U type hoop, the U type hoop is including base and top buckle, is provided with the lock groove between top buckle and base, the inside of lock groove is provided with the metal backing plate, the inside of base is provided with the oblique groove, and the oblique groove extends to the inside of lock groove, the inside of oblique groove is provided with the jackscrew subassembly. To solve the problem that the track is directly acted on the backing plate in the use process and is influenced by the vibration, and with the lapse of time, the backing plate and the hoop will be loose, thereby affecting the stability of the track, the counterbore of metal backing plate and the ball form spherical surface contact, and the backing plate is allowed to be fine in three -dimensional direction, and the supporting spring continuously provides the pre -tightening force, even if the backing plate produces abrasion because of long -term use, and the ball can still closely adhere to the counterbore, and the constant compression force is maintained.

The utility model provides an anode tank shielding plate, which comprises an integrally formed shielding plate body which is arranged on side plates on two sides of an anode tank, the counterbores are formed in the shielding plate body; the fixing pieces penetrate through the counterbores one by one, and the shielding plate body is attached and fixed to a side plate of the anode groove; the at least two overflow ports are symmetrically arranged on the shielding plate body; the overflow pipe is connected with the overflow port, penetrates through the side plate, extends to the outer side of the anode tank and is used for discharging liquid in the anode tank; wherein the cross section of the counterbore comprises a straight line section, a containing section and a protection section which are arranged in sequence, and the straight line section and the containing section are used for containing the fixing piece, so that the shielding plate body is convenient to install and position, and electrolyte crystals attached to the shielding plate body are convenient to clean.

The utility model discloses a high-sensitivity termite detection device convenient to assemble, which comprises an upper top shell, a containing cylinder, an induction trigger piece and bait wood, a magnetic reed switch is arranged in the upper top shell, the magnetic reed switch is provided with a metal reed, a supporting column is arranged in the center of the lower part of the upper shell, and the upper part of the upper shell is provided with an induction trigger piece. The bait wood and the supporting column are arranged in parallel and located on one side of the supporting column, a counter bore is formed in the top of the bait wood, the containing cylinder is placed in the counter bore, the height of the containing cylinder is larger than the depth of the counter bore, an inner cavity of the containing cylinder is used for containing a carrier, and the induction triggering piece is placed above the carrier. According to the termite detection device, the change of the height of the carrier caused by the movement of termites can be sensitively sensed, so that false alarm and missing alarm are reduced, the accuracy of termite detection is improved, the difficulty in assembly and positioning is reduced, and the assembly efficiency is improved.

The utility model discloses a novel broken bridge aluminum alloy profile which comprises an inner frame, a middle connecting frame, an outer frame and connecting pieces, the inner frame and the middle connecting frame are connected through a plurality of connecting pieces, and the middle connecting frame and the outer frame are connected through a plurality of connecting pieces. The connecting piece comprises a rotating block, a clamping block, a counterbore and a screw, the clamping block is connected to the rotating block, the counterbore is formed in the clamping block and penetrates through the rotating block, the screw is arranged in the counterbore, one end of the screw is connected with the inner frame or the outer frame, and a connecting clamping groove is formed in the side, close to the rotating block, of the clamping block; a clamping groove matched with the clamping block is formed in the middle connecting frame; the novel broken bridge aluminum alloy profile is simple in structure, convenient to use and practical, the inner frame, the middle connecting frame and the outer frame are connected through the connecting pieces, and the purposes of reducing production materials and equipment of the aluminum profile and reducing production cost are achieved.

The utility model discloses a distribution box convenient to disassemble and assemble. The distribution box comprises a mounting plate and a box body, a plurality of conical counterbores are formed in the mounting plate; a groove of which the outer contour is larger than that of the mounting plate is formed in the back surface of the box body; a strip-shaped hole is formed in the upper portion of the groove, a hanging plate capable of extending into the strip-shaped hole is arranged on the mounting plate, and a limiting part protruding upwards is arranged at the end of the hanging plate. A vertically-arranged kidney-shaped hole is formed in the lower portion of the groove, an inner threaded sleeve capable of extending into the kidney-shaped hole is arranged on the mounting plate, and a locking bolt is screwed on the inner threaded sleeve. The installation structure has the advantages that the installation plate and the box body can be completely embedded into the groove in the back face of the box body after being assembled, it is guaranteed that the back face of the box body can be attached to the wall face more tightly, and meanwhile the operation procedures of follow-up procedures such as glue sealing treatment are greatly simplified.

The utility model discloses a kind of sunglasses with protective structure on edge, including mirror frame, the inside of mirror frame is equipped with recess, the inside front end of recess is fixedly installed with lens, the both ends of mirror frame are equipped with connecting edge, the surface of connecting edge is equipped with connecting hole, the inside both sides of connecting edge are hinged with connecting block, one end of connecting block is fixedly connected with mirror holder, the surface of one side of connecting block is fixedly connected with hinged joint, the surface of hinged joint is rotatably connected in the inside of connecting hole, the outer surface of mirror frame is equipped with counterbore, connecting rod is fixedly inserted in the inside of counterbore, the end of connecting rod is fixedly connected with protective rubber head, protective rubber head protrudes and is connected to the outside edge position of mirror frame, can be inserted and positioned to support edge position, avoid scratching wear, ensure use intensity and aesthetic property, high adaptability.

The utility model relates to the equipment control instrument supporting field, concretely points to a kind of equipment safety automatic intelligent control device, including control box and the four supporting legs of bearing control box installation, there is also supporting leg positioning installation, with four counterbores cement pedestal, wherein supporting leg is through setting double-end screw rod, support rod, the top plate and bottom plate that mutually open and close are made of, the folding assembly that is fastened installation is carried out in counterbores etc.;The utility model compared with prior art has the advantages that: the device is first matched on the cement pedestal of pre-piled, four positioning counterbores are opened, and four foldable supporting legs are used on control box support, to embed counterbores and lock own position, to make the load support of control box can be disassembled on cement pedestal and ground without damage, so as to be protected.

The utility model relates to the technical field of cranes, and discloses a lazy arm sidewise bending adjusting mechanism and a crane, the lazy arm sidewise bending adjusting mechanism is often installed on a lazy arm, the lazy arm comprises an outer section arm and an inner section arm, the outer section arm is provided with an installation hole, and the inner section arm is nested in the outer section arm. The lifting arm sidewise bending adjusting mechanism comprises a limiting assembly and an adjusting assembly, the adjusting assembly is mounted in the mounting hole, the adjusting assembly comprises an adjusting part body, a counter bore used for containing the limiting assembly is formed in the side, facing the inner knuckle arm, of the adjusting part body, and the adjusting part body can move in the mounting hole in the axial direction; the limiting assembly is driven to apply extrusion force to the inner knuckle arm, and the effect of adjusting the relative position of the inner knuckle arm and the outer knuckle arm is achieved. By the adoption of the sidewise bending adjusting mechanism for the suspension arm, pressure can be applied to the inner knuckle arm conveniently, so that the relative position of the inner knuckle arm and the outer knuckle arm is changed, then the sidewise bending amount of the inner knuckle arm is adjusted, and compared with an adjusting mechanism in the prior art, the sidewise bending adjusting mechanism for the suspension arm is more convenient to operate and better in universality.

The utility model relates to the technical field of screw rods, and discloses a combined adjusting screw with a temperature deviation compensation effect, which comprises a screw rod body, a screw rod rotating part is arranged at the end part of the screw rod body, a rotating slot is arranged on the surface of the screw rod rotating part, a counter bore is arranged at the end part of the screw rod body, a medium material rod is inserted in the counter bore, and the medium material rod is connected with the screw rod rotating part. The counter bore is formed in the end of the screw body, the dielectric material rod is arranged in the counter bore, the dielectric constant of the dielectric material rod can be reduced along with temperature rise, the dielectric constant is reduced, the resonant frequency is high, temperature deviation of the metal cavity can be effectively reduced, and the service life of the screw is prolonged. Therefore, materials such as invar steel are not needed any more, the effect of temperature deviation compensation can be achieved, and use of a user is more convenient.

The utility model belongs to the technical field of ventilators, and particularly discloses a straight flame-proof structure for an air inlet of a centrifugal ventilator, which comprises a straight flame-proof copper ring and a copper rivet, the straight flame-proof copper ring is mounted on the outer side of an air inlet cylinder, and the copper rivet is used for fixing the straight flame-proof copper ring and the air inlet cylinder. A first counterbore is formed in the upper side of the straight explosion-proof copper ring, and a second counterbore is formed in the inner side of the air inlet cylinder; and the first counterbore and the second counterbore are used for placing two ends of a copper rivet. The straight explosion-proof copper ring is arranged on the air inlet cylinder, the straight explosion-proof copper ring is connected with the air inlet cylinder through the copper rivet, the structure is simple, and the manufacturing difficulty is reduced. The straight explosion-proof copper rings are made of copper materials without combustible elements, and the copper rivets are used, so that explosion of flammable and explosive media conveyed by the fan caused by electrostatic sparks is avoided, and safe operation of the fan is guaranteed.

The invention discloses a copper-nickel-gold bump production process based on a display driving chip. The copper-nickel-gold bump production process comprises the following steps: S1, carrying out pre-cleaning treatment on a wafer; s2, opening the passivation layer to expose the bonding pad, and etching the wafer to form a counter bore; s3, the counter bores are filled with metal; s4, performing a yellow light process on the wafer, and forming a front rewiring layer on the wafer; s5, thinning the wafer to expose the counter bore to form a through hole; s6, performing UBM on the surface of the wafer, and forming a bump metallization layer on the rewiring layer; s7, electroplating the outer surface of the wafer to form an electroplated layer; s8, removing the bump metallization layer, which is not shielded by the electroplated layer, on the surface of the wafer; and S9, backflow and shaping of the bump. According to the production process of the wafer bump, the problem of adhesive tape residue can be effectively solved, the residual adhesive tape can be effectively removed, meanwhile, the problem of metal residue at the edge of the wafer can be effectively solved, and the problems of short circuit, packaging reliability reduction or follow-up process pollution can be avoided.

A thrust bearing for an electric submersible pump includes a housing including an axial surface and an inner circumferential surface. Holes and bores are formed in the axial surface. The thrust bearing further includes sockets respectively disposed in the holes and pads each including a fluid interface surface. Two open counterbores are formed in each of the pads. The inner circumferential surface radially constrains the pads. The thrust bearing further includes balls each engaging one of the sockets and one of the pads and retaining bolts each including a head and a shaft extending from the head. Each of the shafts is disposed in one of the bores. The thrust bearing further includes biasing members each disposed between a bearing surface of one of the heads and bottom surfaces of two of the open counterbores. The pads are able to pivot on the ball.

A mandrel assembly (100) for net-shape casting of an undercut finocyl grain (133) with aft-end counterbore (140) in a solid propellant rocket case (101) comprising a core (105) capable of forming central cylindrical cavities in the grain and a plurality of fins (106) capable of forming a plurality of forward-swept longitudinal cavities circular patterned around the core. The method of assembling and disassembling the mandrel (100) comprises the acts of hanging the plurality of fins (106) from the core (105) using a fin hanger (107) with a plurality of long and flexible fin cables (108), hoisting the mandrel assembly (100) over the case aft-end aperture (104), bundling the fins (106) and lowering the mandrel assembly (100) inside the case (101), fastening of all the fins (106) to the core (105) and the core (105) to the case (101), inverting the total assembly, casting propellant slurry through case fore-end aperture (103), curing the propellant, inverting the total assembly back, removing core (105) first, assembling fin decoring tool (134) and removing fins (106) one by one, to obtain net-shape cast undercut finocyl grain (133) with aft-end counterbore (140) without employing squeeze casting or propellant machining.

The embodiment of the utility model provides an anti-pinch household door frame with a handle mechanism, and relates to the technical field of furniture, the anti-pinch household door frame comprises a door frame main body and a groove, the door frame main body is rectangular, the groove is formed in the inner side wall of the door frame main body, and a plurality of threaded holes are formed in one vertical edge of the door frame main body and sleeved with a movable plate; a plurality of counterbores are formed in the side wall of the movable plate, connecting bolts are inserted into the counterbores, the connecting bolts are in threaded connection with the threaded holes, springs are arranged on the outer side walls of the connecting bolts in a sleeving mode, and a handle plate is fixedly connected to the center of the front side wall of the movable plate. When the two door frame bodies are closed, if the hands of an operator are located between the two door frame bodies, along with combination of the door frame bodies, the movable plate can move, the movable plate extrudes and deforms the spring, the direct impact effect on the hands is reduced, response time is provided for drawing out of the hands of the user, and clamping damage is reduced; the use effect is good.

The utility model discloses a mounting structure of a power assembly of a stirrer. The mounting structure comprises a base, the power assembly and an outer shell mounted on the base, the upper end of the power assembly is installed in the outer shell through a rotary buckle assembly, the rotary buckle assembly comprises a buckling block arranged on the power assembly and a step piece arranged on the outer shell, and the buckling block and the step piece can be matched to fix the upper end of the power assembly by rotating the power assembly; a connecting hole is formed in the lower end of the power assembly, and a counter bore which can be aligned with the connecting hole and connected with the connecting hole through a screw is formed in the base. The design that the upper end and the lower end of the power assembly are fixed in a matched mode is adopted, the power assembly is fixedly installed, the overall installation efficiency is high, and convenience is achieved. Compared with a traditional complex die design with a single long-strip screw connecting hole, the die development and machining cost is remarkably reduced.