71results about How to "Simple structure and process" patented technology

The invention provides a multiplexer and a detector. The multiplexer comprises a dielectric substrate, a connecting structure and a plurality of band-pass filters with different working frequencies. A conductive film layer is arranged on the plane of one side of the dielectric substrate and comprises a signal line and a grounding plate located on the side edge of the signal line. The connecting structure is arranged on the conductive film layer and comprises a main branch and a plurality of branches, and the main branch is connected with the branches and serves as an input port of the multiplexer. And the plurality of band-pass filters with different working frequencies are connected with the signal line and the grounding plate. Each band-pass filter comprises a first port and a second port, the first port is connected with the corresponding branch, and the second port serves as an output port of the multiplexer. The signal line, the grounding plate, the connecting structure and the band-pass filter can be located on the same side plane of the dielectric substrate, metal loss and radiation loss are reduced, and integration with other components of the detector is facilitated.

The invention relates to a corrosion-resistant flame-retardant cable and a preparation method thereof, and belongs to the technical field of special flame-retardant cables. The cable is composed of a bunched wire core and a protective sleeve on the surface, and the protective sleeve is prepared from, by weight, 100 parts of PVC resin, 10-15 parts of POE resin, 12-16 parts of insulating filler, 25-30 parts of flexibilizer, 4.8-5.5 parts of stabilizer, 9-13 parts of modified phosphorus-silicon flame retardant, 0.13-0.16 part of antioxidant and 4.5-5.8 parts of lubricant. The modified phosphorus-silicon flame retardant is substituted by hydroxyl single-terminated silicone oil and vinyl trichlorosilane to form a compound with multiple silicon chains and alkenyl, namely an intermediate, DOPO and the alkenyl on an intermediate molecule are subjected to addition, DOPO serving as a phosphorus flame-retardant material is grafted to the intermediate molecule, a large number of silicon chain-DOPO-PVC layered structures are formed in the near surface layer of the protective sleeve, and the flame-retardant protective sleeve is formed. And the shielding, corrosion-resistant and flame-retardant effects are achieved.

The invention discloses a high-resolution angular displacement absolute measurement method and device based on color coding imaging, belongs to the technical field of photoelectric angular displacement measurement, and aims to solve the problems in the prior art. A stepping motor of the device is connected with the center of the back of a circular coded disc, and a bearing of the stepping motor rotates to drive the circular coded disc to rotate; the laser light source and the high-speed CCD camera are placed right in front of the circular coded disc, and the high-speed CCD camera, the stepping motor and the center of the circular coded disc are coaxially placed and are connected with the PC terminal; laser emitted by the laser light source is vertically incident on a coded disc outer ring RGB color block on the front surface of the circular coded disc to form a laser circular light spot as a target detection point; when the stepping motor rotates, the high-speed CCD camera shoots the circular coded disc in real time to obtain a coded disc image signal with a target detection point; and the high-speed CCD camera shoots and stores the image signal in real time and uploads the image signal to the PC terminal for specific demodulation of rotation angle information. The device and the measurement method thereof have the measurement advantages of higher precision and high resolution.

The invention designs a linear heave compensation device based on a double-piston double-rod type energy accumulator, which belongs to the technical field of ocean engineering equipment, adopts the double-piston double-rod type energy accumulator as a coupling device of compensation power, is provided with a plurality of functional cavities, and connects a high-pressure gas cylinder group with a passive compensation gas cavity of the double-piston double-rod type energy accumulator to form a high-pressure gas cylinder group. Therefore, a passive compensation force is provided on the piston rod of the energy accumulator; the two-way variable pump is connected with two active compensation liquid cavities of the energy accumulator, active compensation force capable of controlling the magnitude and the direction is provided on a piston rod of the energy accumulator through a closed variable pump speed control and regulation loop, the passive compensation force and the active compensation force jointly overcome the load of the energy accumulator, and the piston rod of the energy accumulator is driven to move. And finally, the compensation cylinder is indirectly driven to realize a heave compensation function. In addition, the deepwater high-pressure environment pressure acts on the end portions of the energy accumulator load pressure liquid cavity piston rod and the compensation cylinder piston rod at the same time, and the deepwater pressure compensation function is achieved through pressure interaction offset. According to the invention, a plurality of operation modes and functions such as passive compensation, active compensation and water pressure compensation are realized, operation under different working conditions such as overwater, underwater and deepwater areas can be realized, and the device has the characteristics of novel structure, compact system, integration of multiple functions, high compensation precision and the like.

The utility model provides equipment for sewing four edges of a throw pillow case. The equipment comprises a cloth feeding mechanism, a short edge sewing mechanism, a cutting mechanism and a long edge sewing mechanism, the cloth feeding mechanism comprises a first cloth placing frame, a second cloth placing frame and a cloth overlapping module; the short edge sewing module comprises two first sewing machines and two second sewing machines; the cutting mechanism comprises a cloth pulling frame and a cutting knife, and the cloth pulling frame comprises a movable cloth pulling clamp; the long edge sewing mechanism comprises a platform, a movable cloth moving rod is arranged above the platform, and third sewing machines are arranged at the two ends of the platform. Two rolls of cloth are placed on the first cloth placing frame and the second cloth placing frame respectively and overlapped through the cloth overlapping module. Cloth is sewn on the two sides through the two first sewing machines, then the two sides of the cloth are sewn towards the middle by a certain distance through the two second sewing machines, then the cloth is moved to the platform through the cloth pulling clamp to be cut, finally, the cloth is pushed by the cloth moving rod to be pressed and fixed towards the cloth pressing rods on the two sides, the bolster sleeve is formed through sewing of the third sewing machine, and the overall equipment structure and the manufacturing process are simple.

The invention relates to the technical field of waterproof shoe structures and production processes, in particular to a waterproof shoe joint waterproof structure and a waterproof shoe joint waterproof treatment process, a waterproof shoe comprises a vamp with a vamp net foot edge and a lapped bottom lining with a bottom lining edge, and a joint seam is arranged between the vamp net foot edge and the bottom lining edge. The joint seam is filled and blocked through hot melt adhesive fusion infiltration; or the vamp is provided with a splicing seam, a joint seam is arranged between the net foot edge of the vamp and the edge of the bottom lining, and the splicing seam and the joint seam are connected through hot melt adhesive filling and plugging. The process comprises the following steps: splicing the hot melt adhesive tape along the bundle, and sewing the hot melt adhesive tape on the edge of the bottom lining; splicing and jointing to obtain a three-dimensional upper surface; baking the three-dimensional upper surface; pressing the three-dimensional upper surface; the bottom surface is covered with a film composite layer for heating activation, and the film composite layer covers the hot melt adhesive; and pressing the composite shaped vamp. The invention provides a novel waterproof writing structure and a waterproof process, which can effectively prevent water penetration, and the process is simple and easy to operate.

The invention discloses an integrated arc extinguishing system structure, and relates to the technical field of direct current contactors, the integrated arc extinguishing system structure is composed of arc extinguishing chambers, a moving contact assembly and static contact assemblies, the two sides of the moving contact assembly are symmetrically connected with independent arc extinguishing chambers respectively, and the upper sides of the arc extinguishing chambers located on the two sides are correspondingly provided with the static contact assemblies respectively. Two sides of the movable contact assembly are provided with movable arc striking sheets, the static contact assembly is provided with static arc striking sheets, each independent arc extinguishing chamber is correspondingly provided with a movable arc striking sheet and a static arc striking sheet, and one side, close to the movable contact assembly, of each movable arc striking sheet and one side, close to the movable contact assembly, of each static arc striking sheet are correspondingly arranged. The arc extinguish chambers symmetrically arranged on the two sides of the moving contact assembly are the same in structure and have a good arc extinguish effect, and the contactor is small in size, high in operation load, relatively simple in arc extinguish structure and process manufacturing and low in cost.

The utility model provides a visual nutrient canal which can solve the problems that in the prior art, the canal arrangement difficulty is large, and the success rate is poor. The visual nutrient canal comprises an endoscope which comprises an insertion part, an operation part connected with the near end of the insertion part and a camera module which is arranged at the far end of the insertion part and is in communication connection with the operation part; the catheter is used for being in clearance fit with the insertion part and comprises a free end part corresponding to the far end of the insertion part, a sleeving end part corresponding to the near end of the insertion part and a catheter body part extending from the free end part to the sleeving end part; the plugging fixing piece is used for being arranged on the insertion part in a sleeving mode, the plugging fixing piece enables the sleeving end of the catheter to be fixedly connected to the insertion part, a port gap formed between a port of the sleeving end and the insertion part is plugged, and the plugging fixing piece is used for preventing fluid in the body from flowing back along the gap between the insertion part and the catheter.

The embodiment of the invention relates to the field of electrolysis, and provides an isolating membrane, a preparation method thereof and an alkaline electrolysis device. The isolating membrane comprises a supporting layer, a functional layer is arranged on the surface of the supporting layer, and the functional layer is partially embedded into the supporting layer; the porosity of the functional layer is 53%-65%, the average pore size of pores in the functional layer is 50-110 nm, and the average pore size of pores in the supporting layer is larger than the average pore size of pores in the functional layer; the functional layer comprises an inorganic hydrophilic filler and a polymer matrix, and the D50 particle size of the inorganic hydrophilic filler is 0.3-1.5 [mu] m. The isolating membrane in the embodiment of the invention at least has good gas barrier property and good ionic conductivity at the same time, so that the alkaline isolating membrane not only has good safety performance, but also is relatively low in energy consumption.

The invention provides a curtain wall connecting structure and a curtain wall. Second rail grooves are formed in the first side wall, the second side wall and the third side wall of the cross beam respectively; the second rail grooves are parallel to the extension direction of the cross beam; the first bolt and the second bolt are matched with the second rail grooves of the corresponding side walls respectively, the decoration panel can be adjusted in the extending direction of the cross beam, the first bolt is matched with the first rail groove of the corner connector, the decoration panel can be adjusted in the extending direction of the stand column, and the second bolt is matched with the third rail groove of the hanging base. And the decoration panel can be adjusted in the front-back direction. On the basis, in the installation process of the decoration panel, three-dimensional adjustment can be achieved relative to the wall face, the adverse effect of construction errors on opposite seams and coplanarity of the decoration panel is improved or eliminated, the structure and the connecting technology are simple, the occupied space between the decoration panel and the wall face is small, and the assembling stability can be improved.

The utility model relates to the technical field of external terminal resistors for automobiles, and discloses a CAN network terminal resistor connector assembly, which comprises a male end connector assembly and a female end connector assembly, the male end connector assembly and the female end connector assembly are connected in a clamping manner, plastic package resin is fixedly connected in the male end connector assembly, and the plastic package resin is fixedly connected in the female end connector assembly. Male end crimping terminals are symmetrically arranged in the plastic package resin; the resistor body and the two male end crimping terminals are in cold crimping connection, the two male end crimping terminals and the resistor body are plastically packaged in the male end plug connector by adopting plastic packaging resin, and after the female end plug connector and the two female end crimping terminals are fixed together, the female end plug connector and the male end plug connector are connected together in a clamping manner, so that the male end crimping terminals and the female end crimping terminals are connected together in a clamping manner. The terminal resistor is simple in design structure and manufacturing process, low in manufacturing cost, long in service life and convenient to install and maintain subsequently.

The invention relates to a sensing and monitoring system, in particular to a sensing and monitoring system based on a zero-power micromechanical switch. The problems that an existing sensor is short in service life and high in deployment cost are solved. The device comprises a substrate, a first contact electrode, a second contact electrode, a first thermosensitive mechanical arm, a second thermosensitive mechanical arm, a first infrared absorber, a second infrared absorber, a first contact probe and a second contact probe, an etching release area is arranged in the middle of the upper surface of the substrate, the first infrared absorber and the second infrared absorber are arranged in the etching release area side by side, the first infrared absorber is connected with the first contact electrode through the first thermosensitive mechanical arm, and the second infrared absorber is connected with the second contact electrode through the second thermosensitive mechanical arm. The first contact probe is arranged on the first infrared absorber, and the second contact probe is arranged on the second infrared absorber. The invention belongs to the technical field of infrared sensing.

The utility model discloses a fire alarm controller, which mainly solves the problems of low integration level, complex structure and high cost of the existing alarm controller. The controller comprises a control box, a panel and an alarm function module, wherein one end of the panel is hinged with the control box, and the other end of the panel is buckled with the control box; the alarm function module is integrated on the panel; the upper and lower edges of the panel are planes, and are positioned on the inner sides of the upper and lower edges of the control box after being buckled; the left side and the right side of the panel are cambered surfaces, and the control box is sealed by the left side and the right side after buckling; through holes used for being connected with a control box are formed in the upper side and the lower side of the panel respectively. And rotating shafts are arranged at corresponding positions on the inner sides of the upper and lower sides of the control box. The fire alarm controller is simple in structure and high in integration level so as to meet the new national standard design requirement and replace a traditional fire alarm controller. Therefore, the method is suitable for popularization.

The utility model relates to medical instrument technical field especially, more particularly to a kind of adapter applied to monitor, including shell, shell is covered with plug, connecting seat and socket connected in sequence, wherein, the front end of plug is provided with two rows of connecting holes, the rear end of plug is equipped with two rows of elastic sheet corresponding with connecting hole and two skeletons for fixing elastic sheet, and skeleton is connected with plug.The elastic sheet is installed in the plug in the application, the connecting hole is corresponding with the elastic sheet, when the adapter is inserted or pulled out from the connector of monitor, the convex needle is contacted or disconnected with the elastic sheet, so that the elastic sheet occurs elastic deformation or rebound movement, the structure and manufacturing process of elastic sheet are simple, and have good elasticity, conductivity and weldability, the production cost is lower, meet the demand of disposable wrapping use.

The invention discloses a metamaterial load reduction structure and method suitable for high-speed water entry impact. The metamaterial load reduction structure comprises a rectification head cover and a negative Poisson's ratio honeycomb structure in the rectification head cover. The negative Poisson's ratio honeycomb structure is composed of a plurality of star-quadrilateral unit cell elements; each unit cell element comprises a quadrangular star-shaped structure located in the middle and quadrilateral structures arranged at the four vertex angles of the quadrangular star-shaped structure; the quadrangular structure is provided with a unique right angle, and the vertex angle of the quadrangular star-shaped structure is connected with the opposite angle of the right angle of the quadrangular structure. A framework is arranged at the concave part of the quadrangular star-shaped structure; the cell elements are connected with the right-angle sides through the adjacent right-angle sides, and the skeletons are connected with the adjacent skeletons. According to the metamaterial load reduction structure, the impact load borne by the navigation body when the navigation body enters water can be reduced, and the high-speed safe entry of the navigation body into water is achieved.

The utility model discloses a five-pointed star type high-temperature-resistant hydrogen sulfide-resistant screw pump sealing impact device, the main body structure of the five-pointed star type high-temperature-resistant hydrogen sulfide-resistant screw pump sealing impact device is a lower sealing occlusion ring and an upper sealing occlusion ring which are occluded up and down, and the five-pointed star type high-temperature-resistant hydrogen sulfide-resistant screw pump sealing impact device comprises the lower sealing occlusion ring and the upper sealing occlusion ring, a pentagram-shaped occlusion groove is formed in the bottom surface of the upper sealing occlusion ring, the pentagram-shaped occlusion groove and the pentagram-shaped occlusion convex teeth are mutually occluded and clamped, and newly synthesized difluoro vulcanized phenyl silicone rubber is adopted as a main body material. Through the arrangement of the lower sealing occlusion ring and the upper sealing occlusion ring, close fit of the lower sealing occlusion ring and the upper sealing occlusion ring can be achieved, the occlusion surface is of a five-pointed star-shaped three-dimensional structure distributed in the radial direction, the structure has good impact resistance and scouring resistance, the overall structure is simple in process, installation is convenient, the service life is long, and the service life is long. The stable sealing performance of the sealing device in a high-temperature and hydrogen sulfide environment is ensured, and medium leakage is prevented.

The utility model relates to the technical field of consumer electronics, and particularly discloses a dual-rotation assembled headset and earphone, comprising an earphone shell, the earphone shell comprises a first base body and a second base body, and the second base body is connected to the middle part of the upper end of the first base body; the first mounting seat is connected to the edge part of the upper end of the first base body; the first rotating part is used for rotatably controlling the volume, and the first rotating part is rotatably connected to the upper end of the first mounting seat; the microphone rod assembly comprises a microphone rod body and a microphone rod connecting piece connected with the microphone rod body, and the microphone rod connecting piece is rotationally connected with the upper end of the second base body; according to the utility model, the rotation control of the volume and the rotation adjustment of the microphone rod body are separately arranged on the first base body and the second base body of the earphone shell, so that the earphone has the advantages of simple structure and assembly process, and the manufacturing cost and the repair cost of the earphone are greatly reduced.

The present invention provides a method for manufacturing a bamboo-wood multilayer flame-retardant fireproof board, which belongs to the technical field of fireproof boards and solves the existing technical problems of poor anti-falling performance and inconvenience in taking and placing. A method for manufacturing a bamboo-wood multilayer flame-retardant fireproof board comprises a fireproof board body, wherein the fireproof board body comprises a bottom plate and a bamboo-wood panel, a base plate is pasted on the upper side of the bottom plate, a trapezoidal groove is provided on the base plate, a trapezoidal block is integrally formed on the bamboo-wood panel, the trapezoidal groove is slidably connected to the trapezoidal block, and the trapezoidal groove and the trapezoidal block are pasted by glue, a mounting block is fixed at the center of the bottom plate, and a mounting hole is provided on the mounting block that penetrates the fireproof board body. The present invention has the advantages of simplifying the process steps, improving the quality of the flame-retardant board and facilitating taking and placing.

The invention discloses a high electron mobility transistor chip and a preparation method thereof, and belongs to the technical field of semiconductors. The high electron mobility transistor chip comprises a substrate, and an alternating polarization layer, a first buffer layer, a second buffer layer, a channel layer, a barrier layer, a super junction layer and a cap layer which are sequentially stacked on the substrate, the alternate polarization layer comprises GaN layers and AlGaN layers which are periodically and alternately stacked to form a superlattice structure; the first buffer layer is a GaN layer; the second buffer layer is a C-doped GaN layer, and the C doping concentration of the second buffer layer is gradually increased along the epitaxial growth direction. According to the embodiment of the invention, the structure process can be effectively simplified, and the preparation cost is reduced.

The invention provides an ultra-wide tuning range narrow-band optical filter utilizing FP cavity high-order harmonics and a design method of the ultra-wide tuning range narrow-band optical filter. The optical filter comprises an input reflecting layer, a composite cavity layer and an output reflecting layer which are stacked in sequence, the composite cavity layer comprises a metal layer and two single-side cavity layers which are arranged on the two sides of the metal layer and are equal in thickness; by adjusting the thickness of the single-side cavity layer, the filtering center wavelength is adjusted; the larger the thickness of the single-side cavity layer is, the larger the filtering center wavelength is. The metal layer is introduced into the middle of the FP cavity of the optical filter, so that a first-order harmonic peak is effectively inhibited, second-order harmonic waves are reserved, and a sideband at a short wave position is reduced, so that the full width of half peak of filtering is reduced, and meanwhile, the working range of the FP optical filter is widened to the range of 550nm-850nm by utilizing high-order resonance. The optical filter is simple in structure process, easy to implement and simple in structure, and the central wavelength of the optical filter can be adjusted only by adjusting the thickness of the silicon dioxide cavity layers adjacent to the two sides of the metal layer.

The invention discloses a symmetrical angle broadband antenna, comprising a radio frequency connector and a radiation plate, wherein the radio frequency connector is fixedly connected to the radiation plate; a broadband impedance matching hole and a broadband radiation angle curve slot are provided on the radiation plate, wherein the broadband radiation angle curve slot comprises a contraction slot bottom, an opening slot, and a first angle curve slot wall and a second angle curve slot wall opposite to each other, wherein the contraction slot bottom passes through the hole wall of the broadband impedance matching hole, and the opening slot passes through one side of the radiation plate, and the area of ​​the opening slot is larger than the area of ​​the contraction slot bottom. The radio frequency signal of the symmetrical angle broadband antenna is transmitted to the radiation plate by the radio frequency connector, and through the tuning of the broadband impedance matching hole, approximately non-reflection radio frequency transmission within a broadband can be achieved; then, the radio frequency signal is successively converted into a spatial electromagnetic wave along the broadband radiation angle curve slot and radiated outward, thereby achieving a broadband and high-gain radiation effect. In addition, the structure and manufacturing process are simple, the cost is low, and the application prospect is broad.

A tracked external rotor magnetic motor utilizing axial closed-circuit and open-circuit magnetic fields is disclosed. An axially magnetized annular planetary permanent magnet attracts the inner edge of a pressure-bearing elliptical steel track, creating two radial magnetic potential angles on the upper and lower sides of the track's inner edge. At the lower angle, the side poles of the annular permanent magnet are attracted by opposite-pole permanent magnets, resulting in a closed magnetic field that eliminates the magnetic force on the track, causing it to follow the magnet's movement. At the upper angle, the side poles of the annular permanent magnet have an open magnetic field, causing the permanent magnet roller to rotate under the radial magnetic potential, driving the output gear ring wheel. This closed-circuit magnetic effect forms the rotational cycle. This device not only increases the output power density but also compensates for the high friction, power loss, and noise associated with planetary rotation mechanisms. It can be widely applied in transportation, energy construction, energy conservation, and environmental protection. Its simple mechanical structure and manufacturing process make it valuable for broad industrial and commercial applications.

The utility model provides a thin meditation seat which comprises a far infrared heating plate, a fence, a bottom sealing plate and a breathable net, the bottom sealing plate and the breathable net are arranged at the two ends of the fence, and a far infrared emitting plate is arranged between the bottom sealing plate and the breathable net; the problem that a meditation seat cannot be heated to improve meditation comfort is solved.

The invention provides a semiconductor device and a manufacturing method thereof. The device comprises a substrate; the first insulating layer is formed on the substrate; a first semiconductor layer formed on the first insulating layer; the side surface of the first semiconductor layer obliquely intersects with the upper surface of the first insulating layer; a second semiconductor layer formed on a side surface of the first semiconductor layer, a third semiconductor layer formed on a side surface of the second semiconductor layer, a fourth semiconductor layer formed on the first to third semiconductor layers, two-dimensional charge carrier gas is formed at the interfaces of the fourth semiconductor layer and the first to third semiconductor layers. One of the following effects of simple device structure, simple process, low cost and excellent electrical performance can be realized.

The invention discloses an annular sticky wool top supporting mechanism suitable for sand blasting of the inner wall of a slender pipe hole with the hole diameter close to the outer diameter of a sand blasting head. The sand blasting head supporting mechanism solves the problem that a suitable sand blasting head supporting mechanism does not exist when sand blasting is carried out on the inner wall of a small pipe hole.

The utility model belongs to the technical field of spring pliers equipment, and relates to a pair of multipurpose pliers with bidirectional adjusting and self-locking functions, which comprises two pliers bodies symmetrically arranged, the pliers bodies are connected through a connecting shaft, each pliers body comprises a connecting circular plate, the connecting shaft is connected with the connecting circular plate at the bottom into a whole, and the connecting shaft is connected with the connecting circular plate. A limiting layer is arranged on the upper surface of the connecting circular plate located on the top, and a limiting check block is arranged on the connecting shaft. The device is simple in structural process and convenient to manufacture and maintain, reduces the operation difficulty, saves the physical strength of an operator, avoids derivative accidents caused by flying off of the clamping piece, avoids equipment accidents and safety accidents, and guarantees the safety of personnel and equipment to the maximum extent.

The embodiment of the application discloses a kind of microfiltration machines, comprising: box, drum assembly, backwashing mechanism and sewage tank, box is divided into water inlet chamber and filter chamber, water inlet and water outlet are provided on the lateral wall of box, water inlet is communicated with water inlet chamber, water outlet is communicated with filter chamber;Drum assembly is rotationally arranged in filter chamber, one end of drum assembly is communicated with water inlet chamber;Backwashing mechanism is used to backwash drum assembly;Sewage tank is arranged in drum assembly, the other end of sewage tank extends to water inlet chamber and is connected with the inner side wall of box after extending out of drum assembly, and sewage tank does not rotate with drum assembly.The microfiltration machine of the application makes the sewage in water inlet chamber directly flow into the inside of drum assembly through one end of drum assembly, realizes open water inlet, discards the structure form that water inlet pipe traverses box and extends to the inside of drum assembly along the axis of drum assembly, structure process is simpler, product manufacturing cost is low, and disassembly and maintenance are convenient.

The application discloses a combustion chamber structure for limiting the shrinkage and deformation of a head surface of a propellant, which comprises a propellant column, a shell with an insulating layer, and a lining layer, and further comprises an insulating ring, which is arranged at the head of the combustion chamber and is bonded to the shell with the insulating layer by means of an adhesive, and the propellant column is bonded to the shell with the insulating layer and the insulating ring through the lining layer. By arranging the insulating ring with a limiting function at the head surface of the combustion chamber, the radial shrinkage and deformation of the head surface are effectively prevented, so that the assembly interference problem between the inner surface of the propellant column and an ignition device due to the solidification deformation of the inner surface of the propellant column is avoided, the danger caused by the artificial shaping of the head surface is avoided, meanwhile, the gap formed between the insulating ring and the ignition device can effectively prevent the ignition device from being ablated and falling off, and then the thrust and pressure oscillation phenomenon caused by the ablation and falling off of the ignition device is avoided, which is favorable for improving the working efficiency of the solid rocket engine, and the process is simple, the universality is high, the production and maintenance costs are reduced, and the cost reduction and benefit increase are realized.

The utility model relates to a battery management system, which belongs to the field of new energy automobiles and comprises a lower base, an upper cover plate and a PCB (printed circuit board) mother board, the lower base and the upper cover plate are butted and covered up and down to form a shell, the PCB mother board is arranged on the inner wall of the lower base, a PCB daughter board is clamped between the lower base and the upper cover plate, and the PCB daughter board is arranged in the shell. And the PCB daughter board and the PCB mother board are connected and separated through a plurality of copper columns to form a double-layer stacked PCB. According to the battery management system disclosed by the utility model, the structure and the assembly process of double-layer stacked PCBs (Printed Circuit Board) are simple, and the number of related parts is not obviously increased compared with that of a BMS (Battery Management System) of a single-layer board, so that the additional cost is not increased, and the popularization is facilitated.