81results about How to "Low manufacturing cost" patented technology

A construction system uses a comb connector element in combination with flat or generally planar polygona shapes of various types. The comb connector elements connect to the edges of the planar polygonal shapes. Each comb connector has at least one pair of connector members. Each connector member has a proximal end connected to the polygonal member, and a distal end. Each connector member having a face portion that includes a recess extending from a central region of the face portion. The recess extends to the distal end of the face member.

Disclosed herein is a method for inhibiting the premature polymerization and the polymer growth of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of a combination of

(A) at least one inhibitor that is a sulfonated phenol of the formula:

wherein

• • (1) R₂ is selected from the group consisting of hydrogen and hydrocarbyl; and
  • (2) R₁ and R₃ are independently selected from the group consisting of hydrogen and SO₃H, provided that at least one of R₁ and R₃ is SO₃H; (B) at least one inhibitor that is a nitrophenol; and, optionally, (C) an inhibitor selected from the group consisting of nitroxyl compounds and nitrosoanilines; and (D) an amine.

The invention discloses a hollowed-out die for a cast-welding storage battery electrode plate. The hollowed-out die comprises a die body, wherein the two sides of the two ends of the die body are eachprovided with a die groove, a heat dissipation groove is formed in the middle of the top end of the die body, the two sides of the inner wall of the heat dissipation groove are each provided with a groove, and a first heat conduction piece is arranged in the middle of the inner wall of each groove. The hollowed-out die is scientific and reasonable in structure and safe and convenient to use; by means of the heat dissipation groove, the grooves, the first heat conduction pieces, a round hole, second heat conduction pieces and a ventilation opening, the first heat conduction pieces can dissipate heat of the edge portions of the die grooves, the bottoms of the die grooves can be subjected to heat dissipation by means of the second heat conduction pieces, and the first heat conduction piecesand the second heat conduction pieces enable the die body to have the double heat dissipation effect, the heat dissipation effect of the die body is improved, and an original cooling water cooling mode is changed; and cooling water can be prevented from being left inside the die body, and the phenomenon that the interior of the die body is rusted is avoided.

The invention relates to a semisubmersible unmanned platform. Most of the structure of the semisubmersible unmanned platform is under water, has strong wind and wave resistance, and also has the ability to work on water surface and under water at the same time. Compared with an unmanned surface vessel, the semisubmersible unmanned platform is smaller in the size of the part above the water surface, thus having higher crypticity and storm resistance. The semisubmersible unmanned platform ensures that the water surface operating platform of the semisubmersible platform is always above the watersurface through an active floating state adjusting mechanism, has the functions of water surface detection, communication and the like, and can complete the operating task required to be completed above the liquid level. The floating body structure adopts the shape of a double body structure, thus effectively alleviating the influence of the wave and the flow navigation state and increasing the stability. The semisubmersible platform has a simple structure, low manufacturing cost, wide operating range, and the capability of an underwater and water surface unmanned platform, can be widely applied to river and lake hydrological monitoring, port ship monitoring, etc., and is a promising device.

The invention discloses an adhesive dispensing jig. The adhesive dispensing jig comprises a body and a limiting structure. The body is provided with a containing cavity, and the containing cavity is used for containing an element to be subjected to adhesive dispensing. The limiting structure is installed on the body and comprises a plurality of limiting blocks; the limiting blocks are arranged inthe circumferential direction of the containing cavity at intervals; and the limiting blocks can slide relative to the body so as to at least partially stretch into the containing cavity to abut against elements to be subjected to adhesive dispensing. Thus, when elements to be subjected to adhesive dispensing of different sizes need to be subjected to adhesive dispensing, only the elements to be subjected to adhesive dispensing need to be placed in the containing cavity, and then the positions of the limiting blocks are adjusted by sliding the limiting blocks, so that the elements to be subjected to adhesive dispensing of different sizes can be positioned and clamped; and a plurality of different jigs do not need to be arranged to position and clamp the elements to be subjected to adhesivedispensing of different sizes, so that the jig universalization is realized, and the manufacturing cost is reduced.

The invention provides a manufacturing method of a blast furnace cooling wall, and belongs to the technical field of metallurgical equipment. The manufacturing method of the blast furnace cooling wall comprises the steps of copper-steel composite plate manufacturing, water channel manufacturing and water pressure testing. According to the manufacturing method of the blast furnace cooling wall, a water channel cover welded to a steel plate and a water tank formed in one side of the steel plate jointly define a water channel, the water channel cover is arranged to be a convex cover body, the water passing sectional area of the water channel is increased under the condition that the thicknesses of the steel plate and a copper plate are not excessively increased, and therefore the blast furnace cooling wall achieves a preset cooling effect, the size and the weight of the blast furnace cooling wall are reduced, and the manufacturing cost is reduced.

The present invention relates to a mechanical system with a one-way clutch, for example a pulley for a motor vehicle alternator, comprising a first element and a second element which are able to move one with respect to the other in rotation about a central axis and delimit an annular housing radially to the central axis, a one-way clutch device arranged in the annular housing, and at least one rolling bearing arranged in the annular housing. The mechanical system is characterized in that the rolling bearing comprises at least one pressed ring distinct from the constituent elements of the one-way clutch device. The invention also relates to an alternator comprising such a mechanical system configured as a pulley with a one-way clutch.

The invention discloses a light source module. The light source module comprises at least one light source assembly and at least one connector. Each light source assembly comprises a first base plate and at least one light-emitting element. Each first base plate comprises a connecting end, a plate body part, at least one groove and a first electric connecting part. Each groove and the corresponding first electric connecting part are arranged at the corresponding connecting end. Each light-emitting element is allocated at the plate body part of the corresponding first base plate. Each groove is located between the corresponding light-emitting element and the corresponding first electric connecting part. The connectors are allocated at the connecting ends of the first base plates. Each connector comprises at least one fixing piece and a second electric connecting part. The fixing pieces are embedded into the grooves and used for fixing the first base plates. The second electric connecting parts are electrically connected with the first electric connecting parts. By means of the structures of the light source assemblies and the connectors of the light source module, assembling and disassembling of circuit boards are better facilitated.

The invention discloses an automatic tab bending device. The automatic tab bending device is characterized by comprising a mounting base, a through hole, a rotary cylinder, a cushion block, a pneumatic finger, clamping plates, a bump, a pressure block, cover boards, a shaft lever, an ejector element, a pawl, electrode groups, side boards, a mounting plate, a cylinder base, a cylinder, a tab and a partition plate, wherein the cushion block is arranged on the mounting base; the pneumatic finger is arranged on the cushion block; the rotary cylinder is arranged below the mounting base; the clamping plates are arranged above and below the front end of the pneumatic finger; the clamping plates and the cover boards are arranged at the front ends of the clamping plates; the electrode groups are arranged in the middles of the clamping plates; the mounting plate is arranged above the electrode group; the lower part of the cylinder is fixed with the mounting plate; and one side of the cylinder is fixed on the cylinder base. Due to additional arrangement of the rotating ejector element, the bump and the pressure block for synchronously bending the tabs in kneading manner, the force for bending the tabs is harmonious and consistent; zero damage to the side board of each electrode group is ensured; and the quality and the production efficiency of a storage battery product are improved.

An AC-DC withstand voltage partial discharge test circuit comprises an AC circuit, a DC circuit and an AC-DC coupling circuit, wherein the AC circuit processes an AC power supply and then outputs an AC voltage; the DC circuit processes the AC power supply and then outputs a DC voltage; and the output AC voltage and the output DC voltage are respectively connected with the two ends of the AC-DC coupling circuit, so as to provide an AC voltage, a DC voltage or a AC-DC superposed voltage for a to-be-tested component. Aiming at a support capacitor of a DC power transmission key component, the invention provides the AC-DC withstand voltage partial discharge test circuit for simulating the AC-DC voltage superposition condition borne by a test sample during actual operation of the component, theAC-DC withstand voltage partial discharge test circuit is used for a product test with AC-DC high-voltage partial discharge test requirements, and can be used for AC, DC and AC-DC combined tests respectively. The AC-DC withstand voltage partial discharge test circuit has the advantages of high pertinence, low manufacturing cost, no partial discharge of the circuit and the like, and can effectivelydetect the insulation defect of the supporting capacitor component.

The invention relates to a method of measuring temperature of a stator winding of a permanent magnet synchronous motor. The method comprises: obtaining a resistance value of a stator winding of the permanent magnet synchronous motor; and calculating the temperature of the stator winding of the permanent magnet synchronous motor according to a correspondence between a resistance value of the statorwinding and the preset resistance and temperature of the stator winding. In addition, a device for measuring the temperature of the stator winding of the permanent magnet synchronous motor is also provided. The method and device for measuring the temperature of a stator winding of a permanent magnet synchronous motor according to the invention calculate the temperature of the stator winding by setting a correspondence between the resistance of the stator winding and the temperature of the stator winding, and using the obtained resistance value of the stator winding of the permanent magnet synchronous motor as well as the correspondence therewith, so that it is not necessary to use temperature detecting equipment such as a temperature sensor in the equipment to measure the temperature of the stator winding, thereby reducing the manufacturing cost of the permanent magnet synchronous motor or related equipment.

The invention discloses a simple type floating support combination mechanism. The simple type floating support combination mechanism comprises a rectangle fixing block, a floating block and a fastening sunk screw, wherein a rectangle mounting seat is arranged at the bottom of the rectangle fixing block, a positing hole is formed in the bottom of the rectangle mounting seat, a spherical groove is formed in the top of the rectangle fixing block, a tapped blind hole which extends downwards is formed in the middle of the spherical groove, the floating block is a hemispheric block matched with the spherical groove and right placed in the spherical groove, a sunk slotted hole corresponding to the position of the tapped bind hole is formed in the middle of the top face of the hemispheric block, the left side and the right side of the top face of the hemispheric block respectively extend upwards so as to form crescent work piece support faces, the fastening sunk screw connects the rectangle fixing block with the floating block, a hollow area is arranged in the middle of the rectangle fixing block, and weight reduction oblique angles are formed at four corners of the top of the rectangle fixing block. The simple type floating support combination mechanism is specially used for supporting a work piece with a rough bottom face, can reliably position the work piece by using a pressing block in combination, and prevents the work piece from swinging during the drilling process.

The invention discloses a conversion system, a heat dissipation device and a wind generating set. The conversion system comprises a plurality of power modules, the power modules are paved inside a cabin of the wind generating seat; a radiator is arranged on each power module; and the conversion system also comprises a heat dissipation device for carrying out heat dissipation on the radiators by using an external air flow. Through the conversion system, the power modules are installed inside the cabin, so that a converter body is omitted, the using amount of cables is reduced, and the heat dissipation of each power module is improved.

The invention discloses a mixed vaporizer internal combustion waste heat utilization system which comprises a mixed vaporizer. A high temperature liquid inlet of the mixed vaporizer is communicated with an internal combustion engine coolant gallery fluid outlet through a liquid circulation booster pump. A low temperature liquid outlet of the mixed vaporizer is communicated with an internal combustion engine coolant gallery fluid inlet through a throttling control valve or a throttling structure. The mixed vaporizer is provided with a vapor outlet. A liquid area of the mixed vaporizer is provided with a working medium inlet. The loading capacity of the mixed vaporizer is higher than 0.3MPa. The mixed vaporizer internal combustion waste heat utilization system is simple in structure and low in manufacturing cost.

The invention discloses a method for preparing cooled agglomerated pellets by using dry method electric fly ash of converter gas, and is mainly used for solving the technical problem that in the prior art, the cooled agglomerated pellets are limited in use due to high pulverization ratio in preparation of the cooled agglomerated pellets by using dry method electric fly ash of converter gas as well as the problem of high preparation cost. According to the method disclosed by the invention, a sodium polyacrylamide aqueous solution is added into the dry method electric fly ash of converter gas after slaking treatment to prepare the cooled agglomerated pellets, and in the smelting process of molten steel of the converter, the cooled agglomerated pellets which are used as a cold material are added into molten steel, so that the smelting cost of molten steel of an iron and steel enterprise is lowered, and large-scaled recycling of the dry method electric fly ash of converter gas is achieved.

The invention relates to the technical field of household appliances, in particular to a household dough maker. The household dough maker comprises a fixed base and a dough making pot, wherein an inner cavity is formed in the dough making pot; a flour adding opening is formed in the dough making pot; a pot cover is arranged at the flour adding opening; the fixed base is provided with a placing groove; the fixed base is provided with a driving machine; the driving machine is provided with a driving shaft; a dough making cutter is connected to the driving shaft; a fixing rod is connected to thefixed base; a water tank is connected to the fixing rod; a scale plate and a temperature sensor are arranged on the water tank; the fixed base is provided with a power supply tank; the fixed base is provided with an operation panel; and the control panel is provided with a displayer and operational keys. According to the household dough maker disclosed by the invention, flour is added into the inner cavity of the dough making pot from the flour adding opening; a heater is controlled by the operational keys to heat water; after the situation that the temperature achieves an assigned temperatureis detected by the temperature sensor, the power source of the heater is switched off by a controller; an automatic water draining valve is controlled by the operational keys to add water to the inner cavity; and the water addition amount can be controlled by the scale plate.

In order to solve the problem that in the prior art, the production cost is higher due to the fact that square steel needs to be ordered independently for a cross shaft connecting block, the inventiondiscloses a cross shaft connecting block machining process which comprises the steps of tailing selection, heating, forging upsetting, quenching and tempering heat treatment, shot blasting, hole machining, finish machining and the like. The invention further discloses a special die for machining the cross shaft connecting block. The special die comprises a fixed die and a movable die. the movabledie and the fixed die are oppositely arranged, and the movable die and the fixed die move relatively; the fixed die comprises a lower die plate, a lower die surrounding ring, a lower die pressing ring, an ejector rod and a lower die; and the movable die comprises an upper die plate and an upper die. According to the cross shaft connecting block machining process, the material utilization rate isincreased, remaining bars made of the same material are effectively utilized, the bars are manufactured into products to be sold, independent square steel purchasing is omitted, and the manufacturingcost is reduced. The invention further provides the special die for machining the cross shaft connecting block, and the special die is simple in structure and suitable for the machining process of thecross shaft connecting block.

The invention relates to a vehicular soft expanding shelter, which comprises a shelter body fixed on a special automobile chassis; the single side or the left side and right side of the shelter body are provided with an expanding shelter respectively. The soft expanding shelter is characterized in that the expanding shelter forms the soft expanding type shelter by an expanding power device, side expanding soft paulin, a forming and supporting frame inside paulin and a stay bar; the left side plate or the right side plate of the shelter body, a supporting frame and the stay bar are connected with the expanding power device; the supporting frame is connected with the stay bar through a connecting rod mechanism; the soft paulin is connected with the forming and supporting frame inside the paulin; and the floor of the expanding shelter consists of the left side plate or the right side plate of the expanded shelter body. The soft expanding shelter has the advantages that: the soft expanding mode of the soft paulin is adopted, and the manufacturing cost is reduced. After the shelter is expanded, the ratio of the internal actual effective use area to the internal area of the prior shelter is 2:1, and near one time of expanding use area is provided. The soft expanding shelter has the advantages of simple structure assembly, convenient use, and better integration reliability, maintenance and economy.

The invention discloses a rear torsion bar suspension cushion component inspection tool. The inspection tool comprises a pedestal. The pedestal is provided with a detection component I used for simultaneously detecting a distance between the pin sleeve central axis line of a product and a connecting support end surface, a spacing between the upper end surface and the lower end surface of a connecting support, the hole center distance of the inner hole of the pin sleeve and a connecting support hole, and the degree of symmetry of the front end surface and the rear end surface of the pin sleeverelative to a symmetry plane, and a detection component II used for detecting the spacing of the front end surface and the rear end surface of the pin sleeve of the product. The detection component 1comprises a positioning seat body, a check pin guiding body cooperated with the positioning seat body and a height detecting body. The detection component II is a U-shaped groove. By using the rear torsion bar suspension cushion component inspection tool, the structure is simple, operation is easy, manufacturing cost is low and detection efficiency is high.

The invention discloses an anti-damage early warning system for a high-voltage cable channel. The system is applied to the technical field of pipeline detection, especially in the situation of cable damage caused by third-party construction and anti-theft and anti-cutting application and can remind a user of the digging and damaging conditions of an optical cable along the way in a visual manner through characters and images. The system comprises an optical fiber vibration detector, an optical cable connection box A which is connected with the optical fiber vibration detector through an communication optical cable A, and an optical cable connection box B which is connected with the optical cable connection box A through a vibration detection cable and a communication optical cable B whichare arranged side by side; a short message notification module and an optical fiber MZ interferometer comprising a laser and a signal acquisition and processing circuit are arranged in the optical fiber vibration detector; light emitted by the laser is transmitted to the signal acquisition and processing circuit through the vibration detection cable and is used for generating an interference output value; the optical fiber MZ interferometer transmits the interference output value to the short message notification module for editing and sending a short message, and transmits the interference output value to a computer terminal for oscillogram conversion.

Disclosed is a method for separating immunomagnetic bead labeled particulates. A carrier board is formed with at least one flow channel structure, which includes an inner reservoir, an outer reservoir, and at least one micro flow channel in communication with the inner reservoir and the outer reservoir. The method includes labeling target particulates with immunomagnetic bead, introducing a sample fluid into the inner reservoir, and applying a magnetic force and a driving force, wherein the driving force drives the particulates not labeled with immunomagnetic bead to flow through the micro flow channel to the outer reservoir, while the magnetic force attracts the particulates labeled with the immunomagnetic bead to retain in the inner reservoir. The driving force may be centrifugal force, pressure, or surface tension.

The invention provides a device for cleaning ceramic plates. The device comprises a cleaning tank, a nitric acid preparation tank and a nitric acid cleaning liquid pump; the device is characterized in that the bottom of the cleaning tank is connected with an air pipe which is provided with a connector and connected with an air cabinet, the nitric acid preparation tank is connected with the nitric acid cleaning liquid pump, and the nitric acid cleaning liquid pump is connected with the cleaning tank. When the device is in use, ceramic plates to be soaked and cleaned are vertically arranged inside the cleaning tank by use of the connector on the air pipe, the nitric acid cleaning liquid pump is turned on to feed the nitric acid cleaning liquid into the cleaning tank, and then a valve on the air pipe is switched on so that air can be introduced into the ceramic plates to bubble; as a result, the ceramic plates are cleaned continuously under the actions of soaking in the nitric acid cleaning liquid and air bubbling. The device for cleaning the ceramic plates is simple in structure, low in manufacturing cost, convenient to mount and capable of solving the regeneration problem of the ceramic plates. The device for cleaning the ceramic plates is applicable to the field of cleaning ceramic filters.

The invention provides a manufacture method of an array substrate, the array substrate and a display device. A display region of the array substrate comprises a gate line, a data line and a plurality of pixel units. A non-display region comprises a gate bonding pad and a data bonding pad. Each of the pixel units comprises a thin film transistor, a pixel electrode and a common electrode. The pixel electrode is connected to a drain electrode of the thin film transistor. The common electrode comprises a first common electrode arranged above the pixel electrode and a second common electrode arranged above the data line. A protective film is arranged between a common electrode layer and a pixel electrode layer. An inorganic insulating film and an organic insulating film are arranged between the pixel electrode and the data line and between the thin film transistor and the protective film, respectively. The inorganic insulating film is formed above the data line, a source and the drain of the thin film transistor, and a semiconductor layer of a channel region, and the organic insulating film is arranged above the inorganic insulating film. The invention can reduce signal delay on the data line, and prevent generation of leakage current in the thin film transistor at a high temperature.

The invention discloses a heat radiator. The heat radiator comprises a first fixing plate and a second fixing plate, and a plurality of solid heat conducting tubes and a plurality of hollow heat radiating tubes are distributed between the first fixing plate and the second fixing plate. Since the solid heat conducting tubes and the hollow heat radiating tubes are distributed between the first fixing plate and the second fixing plate, and a plurality of air convection holes are formed in the first fixing plate and the second fixing plate, air convection is formed on all surfaces of the heat radiator by the aid of a chimney effect principle, and the heat radiator is higher in effective heat radiating area proportion, larger in heat radiating area in unit volume, lower in manufacturing cost, lighter in weight, smaller in size, safer in use and stronger in market competitiveness.

The invention discloses a high-air-tightness spring safety valve which comprises a sealing cover, a valve rod, a spring, a valve body, a valve clack, a guide sleeve, a protection hood, an air inlet connector, a first sealing gasket and a second sealing gasket. The upper end of the valve rod is connected with the protection hood, and the lower end of the valve rod penetrates through the spring and then is sequentially connected with the guide sleeve and the valve clack. The first sealing gasket is arranged on the valve rod and connected with the protection hood in a sealing mode. The second sealing gasket is arranged on the valve rod and located between the valve clack and the guide sleeve. An upper seal fit face of the second sealing gasket is connected with the guide sleeve in a sealing mode. A lower seal fit face of the second sealing gasket and the valve clack are not tightly sealed. Sealing performance of the safety valve can be greatly improved through the second sealing gasket in the installing process, and sealing connection of the upper end of the safety valve is greatly lowered. Safety accidents caused by safety valve leakage due to abrasion of the protection hood are conveniently reduced through the first sealing gasket. The high-air-tightness spring safety valve has the advantages of being simple in structure, low in manufacturing cost, and convenient to install.

The invention discloses a torque test auxiliary tool of a synchronizer. The torque test auxiliary tool of the synchronizer comprises a torque bearing wheel and a torque input shaft, wherein the torque bearing wheel comprises a flange, a middle shaft and a gear sleeve fixing disk which are fixed in sequence, the flange is capable of being fixedly connected with a test bench, the gear sleeve fixing disk is capable of being fixed to a synchronizer gear sleeve to be detected, and the synchronizer gear sleeve is in tooth engagement with a synchronizer gear hub; and one end of the torque input shaft is coaxially fixed to a power input shaft, and the other end is provided with a driving gear engaged with the synchronizer gear hub. According to the invention, the synchronizer gear sleeve and the synchronizer gear hub are engaged, the torque input shaft and the synchronizer gear hub are engaged, the power input shaft is enable to apply a dynamic and bidirectional load, and in this way, the reliability of a synchronizer is detected, and the production quality of the synchronizer is improved; in addition, the torque test auxiliary tool is capable of ensuring the production quality of the synchronizer in a synchronizer production process, so that the problem that the quality problem of the synchronizer is not found until in a complete vehicle test is solved, so that the manufacturing cost of an integral vehicle is lowered.

A circuit board assembly is disclosed and includes a first circuit board and an external interface disposed on the first circuit board. The external interface includes at least one first pin and at least one second pin. A second circuit board and a circuit disposed on the second circuit board, the circuit including at least one first connection terminal and at least one second connection terminal;At least one conduit for conducting an external interface and a circuit, the conduit comprising a housing and a die disposed within the housing, the housing for conducting a first pin and a first connection terminal, the die for conducting a second pin and a second connection terminal. The invention also discloses an electronic device capable of saving manufacturing cost of a signal transmissionstructure.

The invention discloses a finishing datum conversion device for an aircraft component. The device comprises the aircraft component, and further comprises: a positioning frame, wherein one side of the positioning frame is connected with the aircraft component, three sets of preformed holes are formed in one side of the positioning frame, the three sets of preformed holes are away from the aircraft component, and the three datum holes are located in the same straight line; a positioning part connected with the positioning frame and respectively connected with the three sets of preformed holes; a first bracket connected with the positioning frame through the positioning part, and used for constructing a reference coordinate system of the first original tool main body; and a second bracket connected with the positioning frame through the positioning part. According to the invention, the positioning part and the positioning frame are fixed together to form the processed main body with the aircraft component, and after the processed main body is exchanged up and down, the standard after the exchange can be ensured to be consistent. The device is simple in structure, low in manufacturing cost, easy to maintain and rapid in clamping, and the adjustment and auxiliary time is shortened.

The invention discloses a fire and explosion protection structure installed on a cable intermediate head, and a use method thereof, and belongs to the technical field of the fire and explosion protection of a cable head. The fire and explosion protection structure comprises an outer box body, an assembling end cover, a disposable sealing end cover and an inner sealing ring, wherein the longitudinal assembling surface of the outer box body is provided with a double-channel sealing structure; the assembling end cover and the outer box body adopt an embedded sealing structure; the disposable sealing end cover and the inner sealing ring are arranged on the assembling end cover and are used for sealing a gap between a cable ring surface and the relevant cooperation surface of the assembling end cover; the outer box body is provided with a sealant injection pipe and a vent pipe; and the cable is completely covered with a cable fire protection wrapping tape after the cable is connected by the intermediate head, and is arranged in the outer box body, and fire protection sealant is injected into the outer box body through a sealant injection pipe. On an aspect of operation, firstly, carbon dioxide or nitrogen is used for discharging air in the outer box body, and then, the fire protection sealant is injected into the outer box body to carry out high-pressure sizing. The fire and explosion protection structure carries out pressure maintaining sizing on the fire protection sealant through the outer box body to realize the sealing protection of the cable head, a compact filling layer can be formed on the periphery of the intermediate head, the defect of poor fire protection performance durability and reliability is eliminated, and the fire and explosion protection structure is low in cost and is favorable for popularization.

The present invention provides a metoprolol succinate sustained-release tablet and a preparation method thereof. Metoprolol succinate sustained-release particles are firstly prepared by adopting a hot melting process, and then the metoprolol succinate sustained-release tablet is prepared by granulating and tabletting the sustained-release particles, a disintegrating agent and other additional auxiliary materials. The metoprolol succinate sustained-release tablet provided by the invention has dissolution consistency before and after breaking under the condition that the metoprolol succinate sustained-release tablet is broken off by a patient according to the doctor's advice, can avoid the problem that a sustained-release particle coating layer in the existing sustained-release tablet is easy to break during tablet pressing, can significantly simplify the production process, and reduces the manufacturing cost of a unit preparation, and the clinical medication requirements under the condition of medical insurance cost control in China are met.