108results about How to "Avoid voids" patented technology

The invention relates to the technical field of hollow part production, and discloses a metal-plastic composite car lamp frame shell integrated injection molding device which comprises an injection molding machine, a movable mold and a fixed mold are installed in the injection molding machine, an external manipulator and an external cooling module are installed outside the injection molding machine, and two fixing holes are symmetrically formed in the outer surface of the movable mold; an injection molding assembly is arranged in the injection molding machine, the injection molding assembly comprises not less than two metal pipes and not less than four extension pipes, and in the cooling process, the metal pipes are cooled from inside to outside based on the physical characteristics of the metal pipes; by means of the cooling mode, the middle of the molding material is cooled and shrunk firstly, the situation that the outer layer is solidified firstly due to the fact that cooling is conducted from the outside to the inside of the cavity traditionally is changed, when the internal material is cooled and shrunk, limitation of the solidified outer layer material is avoided, and therefore the problem that cavities are generated due to inconsistent shrinkage is effectively prevented.

The invention belongs to the field of hybrid bonding, and particularly discloses a bonding head for hybrid bonding and a bonding method.The bonding head comprises a bonding head body, the lower surface of the bonding head body is of a horizontal structure, and an annular air pressure groove with a downward opening is formed in the lower surface of the bonding head body along the edge; the positive-negative air pressure device is used for adjusting the air pressure in the annular air pressure groove; and the moving rod assembly comprises a main moving rod and a plurality of auxiliary moving rods, the main moving rod and the auxiliary moving rods penetrate through the bonding head body, and the auxiliary moving rods are arranged around the peripheral side of the main moving rod. According to the bonding head, the annular air pressure groove is formed in the bonding head body, the adsorption force on the to-be-bonded chip is increased, in the bonding process, the main moving rod and the auxiliary moving rod can push the to-be-bonded chip to enable the to-be-bonded chip to have enough deformation quantity, the chip cannot be separated from the bonding head body, the bonding effect of hybrid bonding is improved, and the bonding efficiency is improved. And voids on the bonding interface are avoided.

The embodiment of the invention provides a chip packaging method and a chip packaging structure. The method comprises the following steps: providing a chip, a substrate, a heat dissipation cover plate and a heat conduction metal sheet; wherein a gas groove is formed in the surface of the heat-conducting metal sheet; the front face of the chip is fixed to the first surface of the substrate, the heat conduction metal sheet is arranged on the back face of the chip, the heat dissipation cover plate is fixed to the first surface of the substrate and arranged on the surface, away from the chip, of the heat conduction metal sheet, and a to-be-welded unit is obtained; the gas groove is filled with weld-aid gas; and the heat dissipation cover plate is welded and fixed on the back surface of the chip through the heat conduction metal sheet. According to the embodiment of the invention, the surface of the heat-conducting metal sheet and the surface of the gold-plated layer of the heat-dissipating cover plate are provided with the grooves, so that welding-aid gas can enter the grooves to be in full contact with the welding surface, the problem that formic acid gas is not easy to enter the welding surface is solved, cavities in the welding surface are avoided, and the heat-dissipating efficiency of the packaged chip is ensured.

The invention relates to a semiconductor structure preparation method and a semiconductor structure, and relates to the technical field of integrated circuits. Based on the target photomask, forming first through holes which sequentially penetrate through the supporting laminated layers in the first direction; a target lamination layer is formed on the inner side wall of the first through hole, a second through hole is defined by the target lamination layer, and the target lamination layer comprises target carbon layers and isolation layers which are alternately laminated from outside to inside; forming a dielectric stack filling the second through hole; based on the target photomask, forming a third through hole which penetrates through the dielectric lamination layer and exposes the target lamination layer; etching through the third through hole and removing the residual dielectric laminated layer in the second through hole, and over-etching the first dielectric layer to obtain a groove exposing part of the conductive layer; the target carbon layer is removed, metal barrier layers covering the inner side walls of the third through holes and the inner surfaces of the grooves are formed, and air gaps are formed between the adjacent remaining isolation layers. At least the number of used photomasks can be reduced, and the complexity and cost of the preparation process are reduced.

The invention discloses a part size detection method based on image recognition, which comprises the following steps of: generating a plurality of two-dimensional images with different shadow shapes, recognizing and extracting boundary information and shadow information of a part in the two-dimensional images to obtain the shadow information and normal direction of the part in the two-dimensional images, constructing a three-dimensional image of the part, and detecting the size of the part according to the three-dimensional image. Therefore, the accurate size information of the part can be accurately recognized, the part size measurement precision is improved, the measurement efficiency is further improved, the continuously changing measurement requirements are met, and meanwhile, the normal direction is obtained by recognizing and extracting the boundary information and shadow information of the part in the two-dimensional image, so that the measurement accuracy is improved. And the normal direction information forms a normal field of the part surface, the inclination degree and the shape change of the part surface are known, and the orientation and the concave-convex condition of the part surface are determined, so that the precision of subsequently constructing a part three-dimensional model is further improved, and the measurement efficiency is further improved.

The invention relates to the technical field of perovskite cells, in particular to a hole transport material, a hole transport layer, a preparation method of the hole transport layer and a perovskite cell. The hole transport material disclosed by the invention has a general formula of X3Si-G-R, wherein X is selected from halogen, and G is selected from # imgabs0 # or a benzene ring; r is selected from a structure (I) or a structure (II). The hole transport material provided by the invention has a plurality of Si-X bonds which can form stable chemical bond combination with hydroxyl in a substrate oxide, and the hole transport material has saturated vapor pressure at a lower temperature and is suitable for preparing a trans-perovskite solar cell through molecular layer deposition; the hole transport material can improve the interface stability of the hole transport layer, so that the stability of the perovskite cell is improved, and the photoelectric conversion efficiency of the perovskite cell is improved.

The invention discloses a sole single-mold forming mold and a forming method thereof, and relates to the related field of sole mold forming, the sole single-mold forming mold comprises a fixed block, the bottom position of the fixed block is fixed to the horizontal plane through a bolt, and a sole mold body capable of forming two at one time is installed in the fixed block and a movable block; the rapid cooling mechanism achieves rapid cooling work in the fixed block and the fixed mold block, and the rapid cooling mechanism can act on the oscillation mechanism to achieve sufficient filling of the blank in the shoe sole mold body in the groove of the shoe sole mold body. According to the sole single-mold forming mold capable of achieving one-to-two forming and the forming method of the sole single-mold forming mold, the rapid cooling mechanism is arranged, so that cooling of the conveying pipe can be accelerated, in addition, through cooperative arrangement of the oscillation mechanism, blanks filled in the fixed block and the fixed mold block can be fully mixed, and the forming efficiency is improved. Therefore, the phenomenon of gaps in sole forming is avoided.

The invention provides a control-surface-free unmanned aerial vehicle and a flight attitude control method, and the control-surface-free unmanned aerial vehicle comprises a vehicle body which is provided with wings on two sides as lifting surfaces; the first power mechanism and the second power mechanism are arranged on the wings on the two sides respectively, and the rotation directions of the first power mechanism and the second power mechanism face the outer sides of the wings on the two sides respectively; the driving mechanisms are arranged on the wings on the two sides respectively and used for driving the first power mechanism and / or the second power mechanism to swing upwards or downwards in the forward flight direction of the unmanned aerial vehicle so as to adjust the flight attitude of the unmanned aerial vehicle. The swing angle range of the first power mechanism and the second power mechanism is larger than 90 degrees. According to the unmanned aerial vehicle, flight attitude control in a fixed wing mode can be realized without setting a control surface, the dead weight of the whole structure is greatly reduced, and the load and cruising ability of the unmanned aerial vehicle are improved.

The utility model relates to the technical field of slope protection molds, in particular to a porous slope protection bricklaying prefabricating mold which comprises a bricklaying mold, and a prefabricating groove is formed in the top end of the bricklaying mold. The built-in shaping part is linked with the vibration mechanism, so that cement can be more uniformly distributed in the mold and tightly filled in the mold by a mixture in the mold in a mechanical vibration mode, cavities in the concrete are prevented, the concrete can be firmer, the compactness of the cement can be higher, and the service life of the mold is prolonged. And the situation that the concrete needs to be vibrated and homogenized one by one through vibrating equipment after the concrete is poured into the mold is reduced, the operation steps are relatively reduced, and the working efficiency is improved.

The utility model relates to the technical field of injection molds, and discloses a large complex plastic product sectional type injection mold which comprises a base, a lower mold is fixedly connected to the middle of the upper end of the base, a water tank is arranged at the lower end in the lower mold, and a refrigerator is arranged on the end face of one side of the water tank. A heat absorbing plate is arranged on the outer side of the upper end in the lower die, and heat pipes are evenly arranged at the lower end in the heat absorbing plate at intervals. When the mold is used, the arranged servo motor drives the spiral blades at the four corners to rotate, plastic can be uniformly conveyed into the injection molding cavity, full filling is ensured, bubbles or cavities are avoided, the quality and appearance of products are improved, meanwhile, the filling speed in the injection molding process can be increased, and the production efficiency is improved. The production efficiency is improved, the period is shortened, the yield is increased, stress and deformation in the plastic filling process are reduced, process defects are reduced, and the product quality stability is improved.

This utility model provides a pile head reinforcement structure for construction in hard rock formations, including a steel sleeve, a grouting structure disposed between the steel sleeve and the outer surface of the pile head, a shear structure for forming a mechanical interlocking effect between the pile head and the steel sleeve, an anchoring structure for reliable connection with the pile body, a pressure-bearing flange disposed at the bottom of the steel sleeve, and a reinforcing rib structure arranged on the outer wall of the steel sleeve. The steel sleeve is fitted around the periphery of the precast pile head, and the grouting structure fills the space between the inner wall of the steel sleeve and the outer surface of the pile head and is fixed to both. This pile head reinforcement structure for construction in hard rock formations solves the problem that, due to the lack of effective structural reinforcement and circumferential restraint measures for precast pile heads in related technologies, pile heads are prone to spalling, crushing, cracking, and other damage under high loads and impact conditions.

The utility model relates to an outdoor basketball court with an automatic drainage function, which comprises a drainage channel, and a concrete slope layer, a gravel supporting layer, a fluid transmission pipe network layer, an elastic layer, a surface layer and a line drawing layer which are sequentially paved from bottom to top, the bottom end of the inclined face of the concrete slope layer is connected with the drainage channel, a gravel supporting layer is laid on the concrete slope layer, the surface of the gravel supporting layer is a plane parallel to the horizontal plane where the vertex of the concrete slope layer is located, the fluid transmission pipe network layer is composed of a drainage pipe network and a concrete layer, and the concrete layer is laid on the gravel supporting layer. The bottom of the drainage pipe network penetrates through the gravel supporting layer, an elastic layer, a surface layer and a line drawing layer are sequentially laid on the concrete layer, and the top of the drainage pipe network is matched with the line drawing layer. The design of the concrete slope layer and the fluid transmission pipe network layer is adopted, the functions of rapid drainage and water accumulation prevention are achieved, and the drainage efficiency is greatly improved.

The present invention relates to an intermetallic dielectric layer, a manufacturing method thereof and a semiconductor device. The manufacturing method of the intermetallic dielectric layer comprises: obtaining a base structure formed with a metal structure, the surface of the metal structure being covered by an SRO layer; forming a silicon nitride layer with compressive stress on the surface of the SRO layer on the side wall of the metal structure; filling fluorine-containing silicon glass so that it covers the metal structure, the SRO layer and the silicon nitride layer as an intermetallic dielectric layer. The present invention sets a silicon nitride layer between the SRO layer and the fluorine-containing silicon glass. Since the silicon nitride layer has compressive stress, it can suppress the microscopic deformation of the metal structure caused by the thermal process (the expansion coefficient of the metal structure is larger than the expansion coefficient of the fluorine-containing silicon glass, so the microscopic deformation of the metal structure is large during the temperature change process). Furthermore, since the strength of silicon nitride is relatively large, the newly added silicon nitride layer can prevent the metal structure from being deformed and causing the SRO layer to break, and prevent the subsequent free fluorine ions in the fluorine-containing silicon glass from entering and corroding the metal structure to cause voids.

The utility model discloses a dowel bar device for a cement concrete panel, belongs to the field of roads, and solves the problems that slab staggering, cracking, cracking, void and slab breaking are easy to generate at the junction of a longitudinal joint and an expansion joint of the cement concrete panel. The device comprises two U-shaped dowel bars and a sleeve, an internal thread is arranged at one end of the sleeve, a first side bar and a second side bar are arranged on the two sides of each U-shaped dowel bar respectively, an external thread is arranged at the end of each first side bar, and the two U-shaped dowel bars are connected through the sleeve to form a rectangular structure. The first side rod of one U-shaped dowel bar and the second side rod of the other U-shaped dowel bar are connected to the same sleeve, the first side rod is connected with the sleeve through threads, and the second side rod is connected with the sleeve in an inserted mode. The four panel corners at the longitudinal joints and the expansion joints can be connected to form a closed loop, the functions of the longitudinal joints and the expansion joints in the prior art are considered, the integrity of the cement pavement structure is enhanced, and the effects of preventing slab staggering, cracking, cracking, disengaging and slab breaking are remarkably improved.

The utility model discloses a fixing fixture for an anti-floating anchor rod, and relates to the technical field of mechanical engineering, a second through column is arranged outside the anchor rod, a stable holding mechanism is assembled in the second through column, a power assembly is assembled in the second through column, the stable holding mechanism comprises a plurality of first connecting rods, and the first connecting rods are connected with the first connecting rods. The side end of each first connecting rod is fixedly connected with a second connecting rod, the side end of each second connecting rod is fixedly connected with a hinge block, the side end of the second through column is fixedly connected with a fourth through column, and the side end of each first column block is arranged at the side end of the fourth through column. According to the mechanism, the mechanical transmission principle is adopted, a traditional fixing clamp for the anti-floating anchor rod is improved, the stability of the traditional fixing clamp for the anti-floating anchor rod for fixing the anti-floating anchor rod is improved through an additional structure, when the hole diameter is too large, the anchor rod is inserted, the phenomenon of cavities or non-uniformity in the grouting process can be prevented, and the grouting quality and the anchoring effect are improved.

A composite thawing method for frozen soil in tunnel boring machines (TBMs) includes the following steps: S1, driving sheet piles into the frozen soil location to break up the frozen soil; S2, extracting the sheet piles after construction; S3, applying high-pressure jet grouting with salt-cement slurry to the frozen soil location, using the high-pressure jet grouting to cut and thaw the frozen soil. This invention employs a composite thawing method combining sheet pile breaking and high-pressure jet grouting with salt-cement slurry. During construction, the frozen soil is first mechanically broken up using sheet piles, and then cut and thawed again using salt-cement slurry. Compared to traditional natural thawing or mud circulation thawing methods, this method effectively improves thawing efficiency, shortens the construction period, avoids the problem of soil voids in front of the cutterhead caused by mud circulation thawing methods, improves safety, and has the advantage of low construction cost.

The application discloses a method for generating a stable clamping pose of a double-arm clamping jaw based on a point cloud, and relates to the technical field of robots, and comprises the following steps: obtaining an image of a target object captured by a camera and depth information of a corresponding frame, and inputting the image into a stereo depth estimation model to obtain corresponding estimated depth information. The application solves the problem of depth missing of the target object in a shielding and complex structure area by fusing the depth information of an RGBD camera and the stereo depth estimation result, improves the completeness of point cloud data, adopts a depth fusion mechanism determined by difference to take into account the accuracy of model estimation and camera measurement, improves the quality of point cloud, generates a jaw pose by combining force closure and collision avoidance constraints to ensure the stability and safety of grabbing, reduces the complexity of the model by using point cloud features with rotation and translation invariance, and improves the recognition ability of a grabbing area and the success rate of grabbing by the interaction between target object features and jaw features.

The utility model relates to silicone sealant technical field especially, it relates to a base material production system used in the preparation of silicone sealant, including dehydration kettle and modification reation kettle, and the outlet of dehydration kettle and the outlet of modification reation kettle are connected with the reaction unit respectively, the top and bottom of reaction unit are equipped with inlet and outlet respectively, and the top of reaction unit is equipped with vacuum port, and the vacuum port is connected with vacuum buffer device, the outside of reaction unit is equipped with first heating part, and the inside of reaction unit is equipped with second heating part and pivot, and one end of pivot is connected with motor, and first dispersion part, second dispersion part and third dispersion part are equipped on pivot. The production system is reasonable in design, can guarantee that material mixes evenly, contacts reaction fully, also discharges the moisture in material, reduces and avoids the generation of air bubble when stirring, guarantees the quality of base material.

The utility model relates to the technical field of medical instruments, and discloses a visual measurable intervertebral fusion pressing bone grafting device which comprises a metering tube, a glass tube used for implanting bone grains is connected to one side of the metering tube in a clamped mode, a storage box used for storing the bone grains is arranged on one side of the glass tube, and the metering tube is connected with the storage box in a clamped mode. A push rod used for pressing is connected to one side of the storage box in a clamped mode, and a handle used for holding is arranged on one side of the push rod. According to the visual and measurable intervertebral fusion pressurizing bone grafting device, through the cooperative arrangement of the metering pipe and the push rod, implanted bone grains can be metered by the device during use, so that the use amount of the implanted bone grains in the body of a patient is more accurate, and through the arrangement of the metering pipe, the operation is more convenient; according to the bone grain filling device, the medical staff can know the using amount of bone grains more conveniently through comparison with the metering pipe during use, so that the medical staff can fill the bone grains conveniently according to the situation, the bone grains in the device can be pressed through the arrangement of the push rod, and the convenience of the device is improved.

This utility model relates to the field of door lock technology, specifically a positioning and rotating handle device. It includes a mounting plate with a positioning ring installed in the center. A handle component is rotatably connected to the outside of the positioning ring. The handle component includes a rotating part, the front end of which is fitted onto the positioning ring. A spring is installed inside the rotating part, and a steel ball is attached to the end of the spring. The positioning ring has several equally spaced positioning grooves arranged in a ring on the side near the handle component. When the handle component rotates, the steel ball engages with each positioning groove in sequence, increasing rotational stability and feel. In this positioning and rotating handle device, the spring pushes the steel ball to engage with the positioning grooves on the positioning ring, achieving precise positioning of the handle component during rotation. Each rotation, with the steel ball embedding into the positioning groove, provides clear tactile feedback to the user, preventing any play or jamming during operation. It is particularly suitable for applications requiring high operational precision, improving stability and reliability.

The invention discloses an insertion core auxiliary device and method. The device comprises an inner core, a guide cylinder, a pressing ring, a pressing rod, a guide rod, a forming cylinder, a fixed base, a plug pin, a balancing weight pull rod, a balancing weight and an insertion core support. The insertion core support is connected with the fixed base, the forming cylinder is placed in the fixed base, the pressing rod is connected with the pressing ring, the guide cylinder, the protection ring, the fixed base and the insertion core support, and after the pressing ring is connected with the pressing rod, the guide cylinder and the protection ring are pressed tightly; the guide rod is upwards connected with the inner core and downwards connected with the balancing weight pull rod, the guide rod is connected with the inner core through a sleeve type thread to ensure that a seam is smooth, and the guide rod is connected with the balancing weight pull rod through a bolt; and the balancing weight is arranged on the balancing weight pull rod. According to the invention, the working efficiency is improved, the face-to-face time of people and materials is shortened, for some dangerous or harmful slurry, the operation safety is improved, the descending speed of an inner core after pouring can be adjusted, the introduction of air holes is reduced, and cavities caused by the fact that the backflow speed of the slurry is lower than the descending speed of the inner core are prevented.

The utility model discloses a wall fair-faced concrete blanking and vibrating guiding device which comprises a guiding channel which is a cage-shaped body component with two open ends and a hollow interior. The reinforcing pieces are arranged on the guide channel in a sleeving mode at equal intervals or unequal intervals; and the limiting pieces are used for connecting the reinforcing pieces to the guide channel, so that the wall bare concrete discharging and vibrating guide device is formed. The blanking and vibrating device is simple in structure and novel and reasonable in design, smooth blanking and in-place vibrating of concrete can be effectively guaranteed through the blanking and vibrating channels, and common quality problems such as slag inclusion, bubbles, holes and pitted surfaces after concrete pouring are effectively controlled; according to the fair-faced concrete vibrating device, blanking and vibrating positioning can be facilitated in the pouring process of fair-faced concrete, the concrete pouring quality is effectively controlled, repairing work needing to be carried out due to the fact that vibrating is not in place can be reduced, and therefore the labor cost is reduced, and the construction period is shortened.

The utility model provides a bridge pier column which comprises a column body, arc-shaped columns are oppositely arranged on the two sides of the column body, the arc-shaped columns are connected with the column body through a connecting rod arranged on a horizontal frame, and the bridge deck bearing ends of the column body and the arc-shaped columns are located at the same horizontal extension line. A buffer connecting support is mounted at the bridge floor bearing end of the arc-shaped column; the additionally-arranged arc-shaped columns are matched with the buffer connecting supports arranged on the arc-shaped columns to provide pressure reserve for the bridge piers, the anti-torsion moment is increased, and therefore the influence of deformation generated by a bridge floor on the bridge piers and the supports at the connecting positions is reduced; the bridge surface is raised by the structure, so that the pouring consumables of the bridge pier can be reduced; in addition, the connecting mode can ensure that the bridge pier effectively bears the bridge, and the bridge pier is prevented from disengaging from the bridge floor.

The present invention discloses a multi-modal pushover test system for deep underground structures based on hybrid tests, which belongs to the technical field of underground structure tests. The test system includes a numerical substructure composed of a numerical model of a deep underground structure and a part of the surrounding soil removed, and a test substructure composed of a large-scale stratum-deep underground structure pushover model test designed according to the removed part and a free field model composed of a one-dimensional soil column numerical model, which are respectively connected to the numerical substructure. The present invention also provides a multi-modal pushover test method for deep underground structures based on hybrid tests. The present invention integrates numerical simulation and model tests through hybrid test technology, which can provide more accurate mechanical boundary conditions for pushover tests, thereby being able to well reproduce the initial ground stress state of the deep underground structure while introducing the influence of high-order modes, and also overcome the problem of the traditional pushover test technology that the loading plate and the soil are detached during the loading process.

The utility model discloses a high-stability steel structure box column, which relates to the technical field of box columns and comprises a box column body, a top plate is fixedly connected to the top end of the box column body, insertion rods are fixedly connected to four corners of the top end of the top plate, an opening is formed in the middle of the top end of the top plate, a sealing plate is arranged on the inner side of the opening, and a vertical pipe penetrates through the top end of the sealing plate. A cross plate is fixedly connected to the bottom end of the sealing plate, a plurality of studs are fixedly connected to the side wall of the cross plate, a lining plate is fixedly connected to the inner wall of the box column body, and a clamping groove is formed in the inner wall of the lining plate. By arranging a series of structures, the situation that gaps exist between concrete and the internal structure of the box column due to too dense segmentation is avoided, the situation that the concrete seeps out of the bottom end of the box column can be reduced, pouring forming of the concrete in the box column is facilitated, and therefore the weight of the box column in the moving process is reduced, and the service life of the box column is prolonged. And the butt joint speed of the box-shaped columns is increased, so that movement and butt joint of the box-shaped columns are facilitated.

A printed circuit board (10) for mounting a heat dissipation member (12) is provided with a first pad (16), a second pad (18) connected to a part of the peripheral edge of the first pad (16), and a solder paste (20) applied to the second pad (18). The solder paste (20) has a protruding portion (22) that protrudes from the second pad (18) toward the first pad (16) via a connection portion between the first pad (16) and the second pad (18). The protruding portion (22) extends to the inside of the terminal arrangement region (16AR) of the first pad (16).

This application discloses a method for manufacturing a window and an electronic device including the window. The method for manufacturing a window includes: placing a substrate in a guide film that houses the substrate and is provided with an opening defined to extend through the guide film and overlap with a portion of the substrate in a plan view; providing a first solution comprising light-blocking particles and a polymer resin to an edge portion of an interior space of the guide film, wherein the interior space is divided into a central portion overlapping the opening in a plan view and an edge portion located outside the central portion; providing a second solution comprising the polymer resin to the central portion; placing a magnet to overlap with the edge portion in a plan view, such that the light-blocking particles are moved by means of the magnet; and using ultraviolet light to cure the light-blocking particles and the polymer resin to form a black matrix and a coating.

The utility model relates to a steel bending machine for construction engineering, the steel bending machine for construction engineering is through being provided with transmission link and being connected with the bending bar in its end part, makes it in the process of using, one side can realize the effect that the steel is limited, the other side realizes the bending of two sizes of steel simultaneously through the bending bar, avoids the virtual position of one when the steel of two sizes is bent simultaneously between transmission link and support link, sets up the worm -like revolving stage that the inside diameter is increasing gradually from inside to outside in succession through the bending bar, and the middle part of revolving stage is equipped with the installation slot that facilitates pipe material placement. Make it in the process of using, can realize the effect that the end of the plate is bent in multi -angle, to this to guarantee its applicability in the process of using.

A foldable electronic device comprises a right mounting plate and a left mounting plate, hinges are arranged on the adjacent sides of the right mounting plate and the left mounting plate, the two hinges are jointly provided with a shaft connecting plate, the left mounting plate is rotated towards the right mounting plate along the shaft connecting plate, and the left mounting plate is rotated towards the right mounting plate along the shaft connecting plate. The right mounting plate, the left mounting plate and the shaft connecting plate form a structure in the shape of a folder, a display screen module is arranged in the right mounting plate in an embedded mode, and a mainboard module, a battery module and a WIFI module are arranged in the left mounting plate in an embedded mode. The left mounting plate is rotated along the shaft connecting plate, gaps are prevented from being generated in the folding process of the electronic equipment, the right mounting plate and the left mounting plate can be pulled after folding by arranging the sleeve shell with the tightening belt outside the right mounting plate and the left mounting plate, the right mounting plate and the left mounting plate are prevented from being rotated and unfolded at will, and the structural stability is improved; and meanwhile, the exteriors of the right mounting plate and the left mounting plate are protected when falling and being impacted.

The invention provides a solder resist composition used for filling a through hole of a printed circuit board and the printed circuit board with a cured product of the solder resist composition. The solder resist composition is characterized by containing (A) a carboxyl group-containing resin, (B) a photopolymerization initiator, (C) a compound containing an ethylenically unsaturated group and an epoxy group, (D) an inorganic filler and (E) a thermosetting resin.