76results about How to "Less likely to fail" patented technology

A handle (20) for rapidly firing a semi-automatic firearm (22) having a trigger (24). The handle (20) includes a grip portion (52) defining a channel (54). A block (60) that is connected to the firearm (22) is slidably disposed in the channel (54) for allowing longitudinal movement of the firearm (22) relative to the handle (20). The handle (20) also includes a trigger guard (66) disposed on one side of the trigger (24) and extending longitudinally forward of the trigger (24) by a predetermined distance (D) to an open end. The trigger guard (66) presents a finger rest (70) for placing a trigger finger (74) on the trigger guard (66). The trigger guard (66) restricts access to the trigger (24) until the firearm (22) is moved longitudinally forward by the predetermined distance (D) relative to the handle (20). The handle (20) also includes a lock (44) having an open position for allowing longitudinal movement of the firearm (22) relative to the handle (20) and a locked position for restricting longitudinal movement of the firearm (22) relative to the handle (20).

A trigger safety for a pistol includes a laterally slidable plug incorporated into the trigger that, when slid laterally to extend beyond the confines of the trigger, will prevent rearward movement of the trigger by the plug's interference with the pistol frame. A spring internal to the trigger, imparts a force on plug to retain it positioned in either the safety position or the fire position and resist movement. The plug can be reversed for left-handed users so that the pistol can be placed in a "safe" or a "fire" position with the trigger finger of either hand.

The invention discloses a camellia grafting method by utilizing a buxus sinica stock. A camellia with a certain thickness can be obtained in a relatively short time. A tea tree serving as the stock can grow into needed thickness in a short time, several even dozens of kinds of camellias can grow on the same tea tree, the demands for enjoying various camellias in a small space can be met, and branches and leaves can be trimmed conveniently. The success rate of grafting is improved under the premise that the cultivating period is obviously shortened, and double indexes of the cultivating period and the success rate are guaranteed.

The invention provides a failure analysis method of a gate oxide, which ensures that problems of extremely complicated detection process of a failure chip, relatively long detection period, easy occurrence of failed detection results, higher detection cost and the like in the prior art can be solved. The failure analysis method comprises the following steps: pasting the failure chip reversely on a substrate by hot gel, wherein, the failure chip comprises a substrate and the gate oxide on the substrate; grinding the substrate of the failure chip to certain thickness or fully removing the substrate; soaking the surface of the chip with alkaline solution; and observing the failure chip, wherein, the gate oxide is defective when a control gate is damaged, and the gate oxide is intact when the control gate is undamaged. The detection method of the failure chip has the advantages of simplicity, shorter time consumption, less possibility of failure and lower cost.

A handle (20) for rapidly firing a semi-automatic firearm (22) having a trigger (24). The handle (20) includes a grip portion (52) defining a channel (54). A block (60) that is connected to the firearm (22) is slidably disposed in the channel (54) for allowing longitudinal movement of the firearm (22) relative to the handle (20). The handle (20) also includes a trigger guard (66) disposed on one side of the trigger (24) and extending longitudinally forward of the trigger (24) by a predetermined distance (D) to an open end. The trigger guard (66) presents a finger rest (70) for placing a trigger finger (74) on the trigger guard (66). The trigger guard (66) restricts access to the trigger (24) until the firearm (22) is moved longitudinally forward by the predetermined distance (D) relative to the handle (20). The handle (20) also includes a lock (44) having an open position for allowing longitudinal movement of the firearm (22) relative to the handle (20) and a locked position for restricting longitudinal movement of the firearm (22) relative to the handle (20).

The invention provides a high electron mobility transistor device, relating to the technical field of semiconductors. The first dielectric layer of the device is on a semiconductor layer between a gate and source and drain electrodes. A first source field plate is on the first dielectric layer between the gate and the drain electrode. A second dielectric layer is on the gate, the first source field plate and the first dielectric layer. A second source field plate is on the gate and the first source field plate. The first source field plate and the second source field plate weaken the strong electric field close to a gate area between the gate and the drain electrode. The probability of the failure of the first dielectric layer and the second dielectric layer under long-time stress and high voltage stress is little. According to the device, the strong electric field close to the gate area between the gate and the drain electrode can be weakened, and the probability of the failure of the dielectric layers between the gate and the source field plates can be reduced. The invention also provides a manufacturing method of the high electron mobility transistor device, the process is simple, and the reliability of the manufactured device is high.

The invention relates to a nested water tank capable of reducing vibration and dissipating energy. The nested water tank comprises a spring shock-absorbing seat. A water tank body is arranged on the spring shock-absorbing seat and comprises an outer-layer water tank. A middle-layer nested water tank is arranged in the outer-layer water tank, an inner-layer nested water tank is arranged in the middle-layer nested water tank, and a pressure relief opening is formed at the top end of the outer-layer water tank. The nested water tank capable of reducing vibration and dissipating energy has the advantages that fire demand water or domestic water can be stored on a roof or a mechanical floor of a general high-rise building or a super high-rise building by utilization of the nested water tank, structural vibration energy can be dissipated through dampening effect when an earthquake or strong breeze disaster occur, vibration amplitude of the water tank body and the building is reduced, and damage of the earthquake to the main body structure of the building and the water tank body is reduced. In addition, effect of vibration reduction and energy dissipation is good, efficacy loss cannot occur easily, application range is wide, applicability is strong, the structure is simple, manufacture and installation are convenient, an existing water tank can be transformed to be the nested water tank, cost is low, dual functions of the water tank are achieved, and practical applicability is strong.

The invention relates to a socket and spigot type pipeline connector with an anchoring structure. The socket and spigot type pipeline connector with the anchoring structure is used for continuous nodular cast iron pipes. By means of the socket and spigot type pipeline connector, anchoring reliability can be improved, structural service life can be prolonged, pipeline maintaining cost can be reduced, optimization and simulation of the connector structure can be performed easily, and pipeline transporting capacity is improved. The socket and spigot type pipeline connector comprises a socket, a spigot and a sealing piece which is arranged between the socket and the spigot and used for sealing and locking the pipeline connector. The socket comprises an annular groove which is formed by sequentially connecting a first annular vertical wall, a conical wall, a cylindrical inner wall and a second annular vertical wall in a defined manner. The sealing piece comprises an elastic material ring and a plurality of anchoring pieces embedded in the elastic material ring. Each anchoring piece comprises a head and a plurality of meshing teeth. Each anchoring piece is provided with a rotating circle center. The portion, connected with the annular groove in an abutting manner, of each head is an arc supporting face. The abutting joint area of each arc supporting face and the annular groove is located on the joint of the first annular vertical wall and the conical wall.

The present invention consists of a connection, having an anchored, elongated tension member, a fastening member attached to the elongated tension member, a resisting member that receives the elongated tension member and an expansion device that receives the elongated tension member there through and is compressively loaded between the fastening member and the resisting member by operation of the fastening member on the elongated tension member. The expansion device is formed with a sleeve. First and second bearing members are received in the central aperture of the surrounding sleeve and operatively connected to the surrounding sleeve. At least one of the bearing members is threadably connected to the sleeve. This bearing member can rotate in relation to the surrounding sleeve. A torsion spring connects the first and second bearing members and is located within the surrounding sleeve. The torsion spring biases the first and second members in opposite rotational directions such that at least one of the bearing members is forced to rotate along the thread of the surrounding sleeve away from the other bearing member and out of the surrounding sleeve.

The invention provides a light emitting diode chip and a production method of the light emitting diode chip. The light emitting diode chip and production method of the light emitting diode chip comprise a growing substrate. More than two light emitting diode units are formed on the growing substrate. Each two adjacent light emitting diode units are separated by a deep groove. Non-metal wires are coated on the deep grooves. Two adjacent light emitting diode units are connected in series or in parallel through the non-metal wires. Metal electrode bonding pad is formed on a light emitting diode unit which is on the outmost periphery of the light emitting diode chip. The non-metal wires are adopted by the light emitting diode chip as an interconnecting structure among the light emitting diode units. Compared with metal wires which are high in thickness and poor in light-admitting quality, the non-metal wires are better in light-admitting quality and relatively thinner. When the light emitting diode chip is driven by high pressure, failure of the chip caused by fusing at the corner of a step is not prone to occur. Effective bright dipping area is enlarged and stability of the light emitting diode chip is improved.

A method for forming a semiconductor device to produce graded doping in the source region and the drain region includes the steps of implanting the gate material, usually a polysilicon, with a dopant ion that varies the level of oxide formation on the gate. The dopant ion is driven into undoped polysilicon. Nitrogen ions, may also be implanted in the polysilicon to contain the previously implanted ions. For N-type transistors, typically arsenic is implanted. For P-type transistors, typically boron is implanted. Gates are formed. The gate structure is then oxidized. The oxidation process is controlled to grow a desired thickness of silicon dioxide on the gate. The portion of the gate carrying the dopant grows silicon dioxide either more quickly or more slowly. An isotropic etch can then used to remove a portion of the silicon oxide and form a knob on each sidewall of the gate. A heavy ion implant is then done to convert a portion of the lightly doped source region into a heavily doped region within the source region, and to convert a portion of the lightly doped drain region into a heavily doped region within the drain region. Some of the implanted ions are stopped by the knobs on the gate sidewalls. The regions under the knobs do not have as deep an ion implantation resulting in a shallow region beneath the knob. This forms a graded junction having a specific geometry. The geometry of the interface between the lightly doped region and the heavily doped region in the source region and the drain region depends on the geometry (thickness) of silicon dioxide knobs formed on the sidewall of the gate.

The invention discloses polyester fibers with a catalytic degradation function and a preparation method thereof. The method comprises the following steps: firstly preparing TiO2 intercalated graphene oxide particles; cutting functional particles into micro-nano powder with a strong ultraviolet lamp; keeping the powder suspending in a cavity through air flow, and horizontally feeding colored polyester filaments into the cavity; softening the polyester fibers by controlling the temperature in the cavity so as to effectively bond with the powder; and carrying out hot pressing on the polyester filaments bonded with the functional powder to firmly bond the powder and the polyester fibers. The prepared novel polyester fibers have excellent catalytic degradation performance for aldehydes, benzene and other organic matters in vehicles; and the method is simple and feasible, and the catalytic degradation performance of the fibers can be durable and stable.

Disclosed is a container, such as an above-ground pool, with an improved porthole. The container can include a base, a side wall joined to the base, and at least one porthole. The porthole can comprise an aperture in the side wall and a generally transparent window sheet attached to the side wall and completely covering the aperture in the side wall. Such a design can be stronger and more durable than conventional portholes. The pool can also have portability and storability characteristics that are superior to those of conventional pools.

A semiconductor device having gate oxide with a first thickness and a second thickness is formed by initially implanting a portion of the gate area of the semiconductor substrate with nitrogen ions and then forming a gate oxide on the gate area. Preferably the gate oxide is grown by exposing the gate area to an environment of oxygen. A nitrogen implant inhibits the rate of SiO.sub.2 growth in an oxygen environment. Therefore, the portion of the gate area with implanted nitrogen atoms will grow or form a layer of gate oxide, such as SiO.sub.2, which is thinner than the portion of the gate area less heavily implanted or not implanted with nitrogen atoms. The gate oxide layer could be deposited rather than growing the gate oxide layer. After forming the gate oxide layer, polysilicon is deposited onto the gate oxide. The semiconductor substrate can then be implanted to form doped drain and source regions. Spacers can then be placed over the drain and source regions and adjacent the ends of the sidewalls of the gate.

The invention relates to a conducting cylinder, a manufacturing method thereof, a chip packaging method and a flip chip product. The manufacturing method of the conducting cylinder comprises steps as follows: step S1), surface of a chip electrode, the wall of a hole formed in the chip or a circuit surface of a packaging substrate is subjected to ion implantation and / or plasma deposition treatment through a target material, and a conductive seed crystal layer is formed; step S2), a cylindrical conductor thickening layer is formed above the conductive seed crystal layer, and the conductor thickening layer and the conductive seed crystal layer constitute the conducting cylinder.

A theftproof lamp (100), including a lamp body (110) and a lamp cap (120). A spring member (140) and a ratchet wheel mechanism (130) are provided inside the lamp for cooperating with each other and enabling theftproof effect. When turning the lamp clockwise, the lamp can be screwed down to a lamp socket. When turning the lamp counter-clockwise, the lamp can only make repetitive circular motions around the ratchet wheel and therefore achieve the theftproof effect. When a user needs to remove the lamp in a safe way, a bolt (170) can be moved inwardly to block the spring member from moving upward, so that the lamp body, ratchet wheel and lamp cap form a whole, without any movement in relation to each other, and therefore allowing easy removal of the lamp.

The invention discloses a method for grafting saving of a camellia tree plant with dead overground branches. The method for grafting saving of the camellia tree plant with the dead overground branches comprises the following steps that a camellia tree of which the overgroud stem is dead due to pest and disease damage or environment factors is selected, the dead stem is cut off and removed with a saw, the underground root portion with the physiological activity is left, a notch is cut to be in a deep V shape along the axis of the root, a branch, with a thickness matched with the thickness of the notch in the root portion, of a precious camellia tree is used as a grafting scion wood, 2-5 twigs can be left on the morphological upper end of the branch, the morphological lower end of the branch grafting scion wood is cut to be in a shape matched with the shape of the notch in the underground root portion, the branch grafting scion wood is inserted into the notch in the underground root portion, the cambium and the phloem of the grafting scion wood are aligned with the cambium and the phloem of the root, sealing treatment is carried out, the grafting condition is checked at regular intervals, a plastic film is taken out of the root portion after two months, and the grafting survival condition and the sprouting condition of the scion wood are checked. According to the method for grafting saving of the camellia tree plant with the dead overground branches, the branch of other camellia trees is used as the scion wood based on the original root portion, and the dying camellia tree can survive with the grafting method.

The invention discloses a bistable electromagnetic valve. The bistable electromagnetic valve comprises an air inlet pipe, a valve body and an air outlet pipe; a cylindrical cavity is formed in the valve body, and a fixed annular magnet, a moving assembly and an electromagnet are sequentially arranged in the cylindrical cavity in the direction from the air inlet end to the air outlet end; the moving assembly can move between the fixed annular magnet and the electromagnet in the axial direction of the cylindrical cavity; the moving assembly can seal a valve port under the attraction of the fixed annular magnet, so that the valve is kept in a normally off state; and when the valve is powered on, under attraction of the electromagnet, the moving assembly gets far away from the valve port and is attached to a cylindrical iron core of the electromagnet, the valve is opened, and the structure is a bistable structure. The bistable electromagnetic valve has the advantages that the problems that a traditional electromagnetic valve is low in reliability, large in energy consumption and difficult to miniaturize can be solved, the combination of a mechanical spring and an ejector rod is replaced with a magnetic spring, and therefore the reliability of the electromagnetic valve is improved, and meanwhile the energy consumption and the size of the electromagnetic valve are reduced; and in a micro electronic system, the bistable electromagnetic valve has great application potential.

The present invention provides a phthalocyanine nanorod; an ink composition containing the phthalocyanine nanorod; a transistor containing the phthalocyanine nanorod; a material for a photoelectric conversion device, the material containing the phthalocyanine nanorod; and a photoelectric conversion device containing the phthalocyanine nanorod between the positive electrode and the negative electrode. Since an ink composition containing a nanorod according to the present invention can be formed into a film by a wet process such as a coating method or a printing method, an electronic device that is less likely to fail and is lightweight and inexpensive can be produced on a flexible plastic substrate.

The invention belongs to the technical field of automatic production, and particularly relates to a robot hand claw device capable of automatically hanging and taking a piece for a spraying productionline. The device comprises a mounting bottom frame, a plurality of cross-shaped sliding table driving components, electromagnet suction disc mechanisms and light sources and the cameras, wherein theplurality of cross-shaped sliding table driving components are arranged on the mounting bottom frame, the electromagnet suction disc mechanisms are arranged on the cross-shaped sliding table driving components and the light sources and the cameras are arranged corresponding to each electromagnet suction disc mechanism. The electromagnet suction disc mechanisms comprise rotary air cylinders, suction head mounting plates, a plurality of electromagnets suction head assemblies, wherein the suction head mounting plates are arranged on the rotating shafts of the rotary air cylinders, and plurality of electromagnets suction head assemblies are arranged on the suction head mounting plates. The electromagnets suction head assemblies comprise guide columns, holding rings, electromagnets and springs,wherein the guide columns are penetratingly arranged on the suction head mounting plates, the holding rings are fixed on the upper ends of the guide columns, the electromagnets are fixed on the lowerends of the guide columns and the springs sleeve the guide columns. The rotating shaft of each rotary air cylinder is perpendicular to the central axis of each guide column. The robot hand claw device is capable of simultaneously adsorbing multiple products, and suitable for a product with an uneven adsorbed surface and an obliquely-placed product, and meanwhile the probabilities of grabbing failure are small.

The socket-type pipe interface with an anchoring structure of the present invention relates to a socket-type pipe interface with an anchoring structure for connecting ductile iron pipes. The purpose is to provide a socket-type pipeline interface that can improve anchoring reliability, extend structural life, reduce pipeline maintenance costs, facilitate optimization simulation of the interface structure, and increase pipeline transportation capacity. The invention includes a socket, a socket, and a seal between the socket and the socket for sealing and locking a pipeline interface; the socket includes a first annular vertical wall, a tapered wall, a cylindrical inner wall and a second annular vertical wall. The defined annular grooves are connected in turn; the sealing member includes an elastic material ring and a plurality of anchors embedded therein; the anchoring member includes a head and a plurality of meshing teeth; the anchoring member is provided with a center of rotation, and the head is connected to the annular groove The part where the grooves are in contact is an arc support surface; the contact area between the arc support surface and the annular groove is located at the intersection of the first annular vertical wall and the tapered wall.

A foundation pit supporting and protecting structure of an underground continuous wall is composed of wing plates, metal sheet pillars, a concrete diaphragm wall design depth, extended parts, a round hole, drill holes, a unit groove section, protective walls, wood wedges, channel steels, a water-stopping plate and a steel reinforcement cage. The metal sheet pillars are welded by four steel plates into the shape of II, the left sides and the right sides of the metal sheet pillars are respectively provided with two wing plates, and another steel plate is welded at a half-way line position between the two wing plates on one side to serve as the water-stopping plate. The length of the metal sheet pillars is equal to the concrete diaphragm wall design depth plus the length of the extended parts. The two wing plates arranged on the left sides and the right sides of the extended parts are cut, two ends of the bottom of the unit groove section are respectively drilled with holes, and the extended parts of the two metal sheet pillars are respectively arranged into the drill holes and fixed through concrete pouring. Two sides of the unit groove section are the protective walls, the metal sheet pillars and the protective walls are tightly wedged through the wood wedges, small steel pieces arranged at two ends of the two channel steels respectively cover the metal sheet pillars, the steel reinforcement cage is arranged in the unit groove section, the metal sheet pillars and the unit groove section are all poured with concrete to the height of the floor, and after the concrete is solidified, the wood wedges and the channel steels are removed, thereby manufacturing the foundation pit supporting and protecting structure connected underground.

The invention discloses a foundation pit supporting structure of an underground continuous wall. Two wing plates made of I-shaped profile steel are welded into a steel plate post, the length of the steel plate post is the sum of the design depth of the underground continuous wall and the length of an extended part, a hole is drilled at each of two ends of a unit groove section, the extended parts of the two steel plate posts are arranged in the drilled holes and fixed by pouring concrete, a protecting wall is arranged on each of two sides of the unit groove section, the steel plate posts and the protecting walls are wedged by using wood wedges, two ends of two steel channels are covered on the steel plate posts, a steel bar cage is put into the unit groove section, and two joint boxes are respectively put between the two wing plates outside the two steel plate posts. The concrete is poured into the steel plate posts and the unit groove section till the ground height; and after the concrete is solidified, the wood wedges, the steel channels and the joint boxes are removed, so that the foundation pit supporting structure of the underground continuous wall is formed.

The present invention discloses an LED packaging technology and an LED packaging system. The LED packaging technology comprises the following steps of firstly adhering a chip and an FPC with a silvercolloid, then using a die bonder to die bonding an LED, using a mold pressing device to carry out the first time mold pressing on the LED, and secondly using a fluorescent coating device to coat a fluorescent film on the LED, using the mold pressing device to carry out the second time mold pressing on the LED, and finally using a packaging machine to package the LED, and warehousing the packaged LED. The LED packaging technology and LED packaging system of the present invention break through a conventional packaging technology, adopt a flip chip bonding mode to conduct electricity, do not needthe gold wires to connect, reduce the LED failure due to the bonding wire problems, and are better in radiating effect.

The present invention discloses an infective rhizoctonia disease compound bactericide and a production method of the bactericide, which consists of a bactericide and an acid regulating agent; wherein, the effective compositions of the bactericide consists of the thiram, the metalaxyl, the ziram and a carrier; the acid regulating agent consists of the sulfuric acid and a carrier. The production method of the present invention is to uniformly mix the raw materials such as the thiram, the metalaxyl and the ziram with the carrier to be made into a single-bag product of the bactericide; to spray the sulfuric acid on the carrier and to re-mix to be a carrier containing the acid, thereby producing an acid regulating sing-bag product. Re-mixing the thiram, the metalaxyl and the ziram, the present invention has a favorable combinational toxicity, which can improve and protect the growth environment of the crops and can prevent the occurrence of the zinc deficiency. The compound bactericide is made by the powder acid regulating agent directly mixed with the soil, which is simple and convenient to operate; the effective composition of the compound bactericide can increase the seedling in the tri-leaf period to ten or more; the present invention adopts the coal gangue powder and the rice hull powder as the acid carrier, which has high content of the acid and has a favorable aeration; moreover, the coal gangue powder is an organic substance, which can improve the soil without any pollution. The efficiency for adopting the present invention to prevent the rice infective rhizoctonia disease can reach ninety nine percent or more.

The invention relates to an air flue assembly and a fresh air unit. The air flue assembly comprises an air flue, a sealing element (7) arranged in the air flue and made of a flexible material, and a sealing state adjustment part for actively adjusting a state of the sealing element (7) so as to enable the air flue to close when the sealing element (7) is in contact seal with a side wall of the airflue and enable the air flue to open when the sealing element (7) is not in seal with the side wall of the air flue. According to the air flue assembly and the fresh air unit provided by the invention, the flexible sealing element is adopted and can tightly fit to a sealing surface under the control of the sealing state adjustment part, and the flexible sealing element can eliminate a contact gapthrough self-deformation, so that a contact pre-tightening force is increased, and a sealing effect is optimized. In addition, a sealing structure is more reliable compared with an air valve structure, and cannot be invalided easily after long-time use. In addition, the air flue assembly can further adapt to various conditions such as planes and irregular surfaces, is higher in adaptability, andcan be beneficial to reducing the requirement on the processing precision on the side wall of the air flue.

The invention discloses a gastric diversion apparatus and an implantable catheter thereof. The implantable catheter comprises a membrane tube, wherein a stent is connected to one end of the membrane tube; and the membrane tube is prepared by mixing and blowing the following materials in parts by weight: 0.5-1.5 parts by weight of high density polyethylene, 4 parts by weight of low density polyethylene, 4 parts by weight of linear low density polyethylene and 0.5-1.5 parts by weight of barium sulfate. According to the scheme, the implantable catheter is made from a membrane tube material which is softer and more comfortable, lower in human rejection and free from injury; the implantable catheter is convenient in manufacturing process, low in cost and high in production speed; and the implantable catheter is applicable to long-term implantation in a human digestive tract.

The invention discloses a preparation method of a bacterial cellulose-epoxy resin flexible transformer encapsulating material. The preparation method comprises the steps of firstly crushing bacterialcellulose, adding the crushed bacterial cellulose into an acetic acid water solution, carrying out ultrasonic dispersion so as to obtain bacterial cellulose slurry, uniformly mixing the bacterial cellulose slurry with styrene-butadiene latex, carrying out centrifugal spray drying by virtue of a centrifugal spray dryer so as to obtain bacterial cellulose-butadiene styrene rubber hybridized powder,and uniformly mixing the hybridized powder with epoxy resin and a curing agent, so as to obtain the bacterial cellulose-epoxy resin flexible transformer encapsulating material. The prepared transformer encapsulating material has the characteristics of high tenacity and good vibration resistance, does not easily crack and lose efficacy and is high in reliability and long in service life.

The invention discloses a manufacturing method of a cemented carbide nail rolling roller. The cemented carbide nail rolling roller is composed of a roller core and a roller sleeve. The method utilizes centrifugal and composite casting methods to directly insert and cast alloy nails on the roller sleeve. On the outer side of the roller sleeve, the centrifugal tooling used in centrifugal and composite casting includes a cold-type tooling for fixing alloy nails on the inner surface that matches the outer diameter and height of the roller sleeve. The invention adopts the centrifugal casting method to directly insert and cast alloy nails on the outer circumference of the rolling roller sleeve without mechanical inserts; the base of the roller sleeve and the alloy nails are closely combined, and cracks are not easy to cause failure, and at the same time, the production cost is lower than that of mechanical inserts. .