70results about How to "Without compromising security" patented technology

The utility model relates to the technical field of fixing and supporting, and discloses a fixing and supporting device for house assembly type construction, which comprises a base I and a base II, a guide rod is fixedly connected onto the base I, a limiting block is fixedly connected onto the guide rod, a threaded rod is rotatably connected between the limiting block and the base I, and a threaded rod is fixedly connected onto the threaded rod. A threaded block is in threaded connection with the threaded rod, a connecting long strip is hinged to the threaded block, a supporting rod is hinged to the connecting long strip, the supporting rod is hinged to the limiting block, and the threaded block is slidably connected to the guide rod. According to the fixing and supporting device for house assembly type construction, when the fixing and supporting device for house assembly type construction is used, the motor is started and drives the threaded rod to rotate, so that the threaded hole in the threaded rod ascends, the supporting rod is unfolded to be used for supporting an assembly type component, the stress area is greatly increased, and the component is uniform in stress, not prone to deformation and firm in connection; the overall safety and stability are not affected, operation is easy, and time and labor are saved.

The invention relates to the technical field of excess pressure recycling, and discloses an excess pressure recycling method and system, and the method comprises the steps: receiving an excess pressure recycling instruction, and deploying a plurality of excess pressure recycling detection points on a device to be subjected to excess pressure recycling; collecting excess pressure data of each excess pressure recovery detection point, and calculating an excess pressure detection factor of the corresponding excess pressure recovery detection point; screening all the excess pressure recovery detection points based on the excess pressure detection factors to obtain a target excess pressure recovery detection point; the generated residual pressure is introduced into a pressure energy conversion device, and the residual pressure is converted into mechanical energy to be recycled; the working state data of the synchronous generator is set according to all the target residual voltage recovery detection points, the mechanical energy to be recycled is converted into electric energy based on the synchronous generator, and electric energy grid connection is performed according to the grid connection controller, so that intelligent residual voltage recovery is realized, the residual voltage recovery difficulty and cost are reduced, and the recovery efficiency is improved. The safety of the equipment to be subjected to excess pressure recovery is not affected, the excess pressure utilization efficiency is high, and environmental pollution is reduced.

The invention relates to a self-adaptive damp-type wiping control method for accumulated dust of roadway electric power facilities, and belongs to the field of coal mine roadway cleaning. The method comprises the steps of accumulated dust thickness monitoring, a self-adaptive cleaning algorithm, PLC control, carrying platform self-adaptive walking and the like. According to the method, the thickness of accumulated dust on the surface of the roadway electric power facility is monitored in real time through a two-dimensional line laser scanner, the function relation between the damp-type cleaning effect and influence factors is established according to the thickness of the accumulated dust and cleaning parameters of a drum-type brush, and self-adaptive adjustment of the cleaning parameters of the drum-type brush is achieved through a PLC programming control method; the walking speed of the carrying platform and the distance between the carrying platform and the two sides are controlled, and stable operation and the cleaning effect of the cleaning mechanism are guaranteed. The cleaning efficiency can be effectively improved, the cleaning effect is ensured, the labor intensity is reduced, the safety is improved, water resources are saved, the maintenance cost is reduced, the equipment reliability is improved, and the cleaning device is suitable for cleaning electric power facilities in environments such as coal mine tunnels.

The utility model relates to a newly-built channel supporting structure close to important buildings, which comprises a plurality of cast-in-situ bored piles respectively arranged on two sides of a channel, a high-pressure jet grouting pile is arranged between every two adjacent cast-in-situ bored piles, a top beam is arranged at the top of each cast-in-situ bored pile, a channel bottom lining is arranged on the bottom surface of the channel, and the channel bottom lining is arranged on the bottom surface of the channel. Hidden beams are arranged at the positions, close to the cast-in-situ bored piles, of the two sides of the channel below the channel bottom lining, the hidden beams on the two sides are connected through hidden supports arranged at intervals, and stand column piles are arranged below the middles of the hidden supports and connected with the top beams through temporary vertical inclined supports. The hidden beams and the hidden supports are arranged at the bottom of the channel, the hidden beams and the hidden supports can serve as inner supports to reduce deformation of the side wall of the channel, safety of buildings around the channel is guaranteed, the water passing section is not affected, the length of the supporting piles can be shortened on the premise that safety is guaranteed, cost is saved, and the stand column piles are arranged to guarantee that when the channel is wide, the hidden supports are stably stressed. And the safety of the channel is not influenced.

The utility model provides an existing building masonry infilled wall protective dismantling structure which comprises a suspended ceiling, infilled walls and a frame beam, the infilled walls are arranged on the two sides of the suspended ceiling, and the suspended ceiling is located on the lower portion of the frame beam. The utility model has the advantages that the channel steel cross beam, the angle steel bracket, the channel steel buttress, the suspender, the tapered end channel steel and the tapered end nut are arranged in a matched manner, and the double-spliced channel steel cross beam is matched with the angle steel bracket and the channel steel buttress, so that a powerful supporting system is provided for the infilled wall. The structure can effectively guarantee the stability of the remaining wall body and the suspended ceiling structure, and the suspended ceiling is prevented from being damaged in the wall body dismantling process. By arranging the suspenders, the lock head channel steel and the lock head nuts, the span of the double-spliced channel steel cross beam can be effectively reduced, the safety of the wall body is ensured, and the protective construction mode can effectively avoid damage and loss to the suspended ceiling caused by dismantling work. In this way, protective dismantling of the infilled wall can be achieved on the premise that the safety of the suspended ceiling is not affected, and the problems existing in the prior art are effectively solved.

The utility model provides a folding wooden children's learning tower, including upper tower and lower tower, the upper tower includes upper tower side plate, upper tower bottom plate and upper tower back plate, the upper tower side plate is provided on the two sides of upper tower bottom plate respectively and vertically connected, the two ends of upper tower back plate are connected on the upper tower side plate through back plate bolts, and the upper tower bottom plate is connected with the upper tower side plate through the back plate bolts. An overturning stop lever is arranged between the two upper tower side plates, the lower tower comprises lower tower side plates and a lower tower top plate, the lower tower side plates are fixedly connected to the two sides of the lower tower top plate respectively, and the lower tower top plate and the upper tower bottom plate are close to each other; the upper tower body and the lower tower body are arranged and rotationally connected through the hinge, the using function of the learning tower can be changed by changing the unfolding shape of the learning tower, the upper tower body and the lower tower body can be locked through the hasp, and it is guaranteed that when a child stands on the surface of the upper tower body, the hinge does not affect the safety of the whole learning tower; and the upper tower and the lower tower cannot be easily folded, so that the safety is enhanced.

The present application relates to a kind of laser radar and camera online self-calibration method and system without induction, the method includes: S1.in the process of vehicle driving, through multi-source trigger mechanism acquisition laser radar point cloud data and camera image data, simultaneously obtain vehicle motion state information and automatic driving perception system output result, the multi-source trigger mechanism includes time trigger, event trigger and cloud data mining trigger parameter degradation model;S2.the pre-processing and feature extraction of the multi-source data collected, obtain laser radar point cloud feature and camera image feature;S3.based on geometric constraint, motion consistency and perception result fusion, constructs multi-modal verification model, and carries out multi-dimensional verification to calibration parameter.The present application not only reduces the artificial maintenance cost, through automatic means maintenance vehicle state to achieve sensor calibration parameter degradation self-detection and self-calibration without induction, and improves the reliability and attendance rate of automatic driving vehicle.

The utility model belongs to the field of camera accessories, and particularly relates to a battery cover waterproof structure of a detachable battery of a camera, which comprises a rotary bracket assembly and a battery cover, wherein the rotary support assembly is hinged to an opening of the battery compartment, a waterproof ring is arranged on the bottom side of the rotary support assembly, and when the rotary support assembly rotates to cover the opening of the battery compartment, the waterproof ring is attached to the edge of the opening of the battery compartment; guide rails are arranged on the top side of the rotary support assembly. The periphery of the battery cover is provided with a boss buckled with the edge of the opening of the battery bin, the back face of the battery cover is provided with a guide groove matched with the guide rail, the battery cover is guided through the guide rail, the rotary support assembly provides pre-tightening force for pressing the waterproof ring through the guide groove, and after the waterproof performance of the battery cover capable of replacing the battery is improved, the safety of outdoor use can be improved.

The invention provides a hollow fiber membrane module which does not need sterilization operation of a liquid separator of a user side and can improve convenience. A hollow fiber membrane module is provided with: a housing having at least two ports; a hollow fiber membrane disposed in the housing; and two or more sterile connectors which are attached to the ports and which connect the housing and the liquid flow line, and which do not require a sterilization operation, the hollow fiber membrane module being sterilized in a sealed state in which the pores of the hollow fiber membrane are held by a membrane pore holding agent comprising an alcohol aqueous solution and the ports and the sterile connectors are integrated or connected. The alcohol concentration in the aqueous alcohol solution is from 8% by weight to 20% by weight (inclusive).

The present invention discloses a data decryption method for a mobile data storage device, which includes the following steps: S1, verifying the identity of the user, assigning access rights, and generating an identity authority key; S2, reading a request instruction for data access, determining the type of access data, and generating a data access key; S3, performing a point multiplication operation on the identity authority key and the data access key to generate a decryption request key; S4, the decryption request key obtains the corresponding data decryption key from the decryption key data management library; S5, the data decryption key decrypts the corresponding data; S6, a hash function verifies whether the file has been tampered with; S7, the mobile data storage device outputs the target data. In the present invention, the identity authority key can be generated only after identity authentication, the data decryption key corresponding to the access data type is decrypted from the decryption key data management library through the decryption request key, and the data decryption key is then decrypted, which increases the difficulty of decryption, thereby improving data security.

The invention discloses a safety torque cancelling circuit which comprises a channel loop configured to obtain a safety signal from a safety loop of an elevator and cut off a power supply of an isolation driving unit of an upper bridge arm switch tube or / and a lower bridge arm switch tube in response to the state of the safety signal; and the diagnosis loop receives the output state of the channel loop and is used for cutting off the driving signal of the upper bridge arm switch tube or / and the lower bridge arm switch tube when the diagnosis is abnormal. While electronic star sealing is realized, the fault margin and safety of the STO are not reduced. In addition, as the STO only blocks the driving signal of the upper bridge arm or the lower bridge arm, the lower bridge arm or the upper bridge arm can adopt an electric braking method for improving the braking torque disclosed by CN117997175A.

The present invention provides a support system, comprising: a tunnel boring machine; a telescopic part, the first end of which is mounted on the tunnel boring machine; a support part, which is arranged at the second end of the telescopic part, and the support part comprises at least one support mechanism, the support mechanism having a retracted position in which the extension direction of the support mechanism is parallel to the axial direction of the telescopic part, and an extended position in which the extension direction of the support mechanism is at a predetermined angle to the axial direction of the telescopic part; the present invention realizes the support operation of the front end of the tunnel boring machine through a first anchor drilling machine, and when the tunnel boring machine is cutting, the support mechanism can be retracted, which does not affect the cutting operation of the tunnel boring machine and the sight of the tunnel boring machine driver. When performing tunnel support operations, the support part is extended to the front end of the tunnel by extending the telescopic part, and the support mechanism temporarily supports the tunnel to protect the safety of the support operators, has a small size, a simple structure, does not occupy tunnel space, does not affect the support operations of the operators, and does not affect the transportation channel and the escape channel for personnel.

The invention discloses a temperature control integrated assembly type protective seat for marmoset experiments, which comprises a seat main body structure comprising a detachable horizontal back plate, a semi-cylinder which forms an accommodating cavity with the horizontal back plate and is used for supporting the body of a marmoset, and a circular seat plate which is arranged in the semi-cylinder and is used for adjusting the relative position of the marmoset in the semi-cylinder, a supporting panel for fixing the head of a marmoset and a neck restraining plate are arranged at the top of the semi-cylinder; the head fixing protector comprises an arc fixing part which is vertically mounted on the supporting panel and is used for protecting the rear head and neck of the marmoset, and an arc chin supporting plate which slides up and down along the arc fixing part and is used for supporting the chin of the marmoset; the damping material is arranged in the seat main body structure and the head fixing protector at the contact part with the marmoset; the temperature control adjusting system comprises an air cooling adjusting module and a water cooling adjusting module, the air cooling adjusting module controls the fan to achieve air cooling temperature adjustment, the water cooling adjusting module controls the water cooling pipe to achieve water cooling temperature adjustment, and the seat can provide a stable and comfortable experiment environment for marmosets.

The utility model provides a top cover assembly, a battery monomer, a battery and a power utilization device, and relates to the technical field of batteries, the top cover assembly comprises a top cover sheet, a pole and a first insulating piece, the top cover sheet is provided with a first surface, a second surface and a first through hole, the pole comprises at least one first connecting part and at least two second connecting parts, the first connecting part is arranged on one side, provided with the first surface, of the top cover sheet and is used for being connected with an electric connecting piece, and the second connecting part is used for being connected with a tab; the first insulating part is fixedly connected to the pole and the top cover piece and comprises a second insulating part and a third insulating part which are connected, the second insulating part is arranged between the hole wall of the first through hole and the second connecting part of the pole, and the third insulating part is arranged on the side, provided with the first face, of the top cover piece; therefore, the first insulating part has fixing, insulating and sealing effects at the same time.

This invention provides a two-way plastic stacking barrel, relating to the technical field of plastic packaging barrels. The two-way plastic stacking barrel includes a barrel body, a handle, and a barrel opening component. The upper part of the barrel body has a handle groove, a barrel opening groove, a raised strip, and a top flat surface. The lower part of the barrel body has a groove, symmetrical side grooves, and a bottom flat surface. The handle is disposed within the handle groove and connected to the barrel body; the barrel opening groove communicates with the handle groove; and the barrel opening component is disposed within the barrel opening groove. The groove is adapted to the raised strip, the symmetrical side groove communicates with the groove, and the bottom flat surface is adapted to the top flat surface. This two-way plastic stacking barrel solves the technical problem of existing plastic packaging barrels having poor stacking stability and flexibility, affecting the safety and efficiency of material storage and transportation.

The invention relates to a bridge landscape guardrail section street lamp foundation mounting system under special conditions, which comprises a bottom flange plate and an L-shaped plate, the bottom flange plate is partially mounted on a beam plate, and partially overhung out of the beam plate; the bottom end of the street lamp stand column is fixed to the bottom flange plate through the column foot chassis. The top end of the L-shaped plate is fixed at the bottom of the overhanging part of the bottom flange plate, and a bottom plate of the L-shaped plate extends below the beam plate; the column foot chassis, the beam plate and the L-shaped plate are connected in a penetrating mode through a first opposite-penetrating bolt. The connecting structure has the beneficial effects that the limited space of the edge of the beam plate on the outer side of the landscape guardrail is fully utilized, the edge of the beam plate is clamped and fixed through the bottom flange plate and the L-shaped clamping plate, the L-shaped clamping plate and the stiffening plate are additionally arranged in consideration of the ultrathin beam plate to improve the system stability, and the column base chassis, the beam plate and the L-shaped plate are vertically connected in a penetrating mode through the first opposite-penetrating bolts; by means of the structure, the street lamp stand column can be effectively prevented from toppling towards the outer side of the beam plate, transverse bolts do not need to be arranged, the thin beam plate can be fixed, and use and safety of the landscape guardrail are not affected.

The invention provides a multi-component composite electrolyte, a preparation method and application of the multi-component composite electrolyte in a zinc ion battery. The preparation method of the multi-component composite electrolyte comprises the following steps: adding acetamide and asparagine into a ZnSO4 solution, uniformly stirring and mixing, and standing to obtain the multi-component composite electrolyte. The aqueous zinc ion battery with long normal / low temperature cycle life, stable electrode / electrolyte interface and strong corrosion resistance is realized by a method for compensating the negative effect of dynamics caused by an organic solvent, introducing acetamide into a ZnSO4 electrolyte to improve the wide temperature range adaptability of the battery, and introducing asparagine to compensate the reversibility of Zn deposition dynamics.

This invention discloses a construction method for deep and large foundation pits without the need for replacement supports, belonging to the field of underground structure sequential construction technology. During the main structure construction, after the previous formwork sidewall is completed, only the next steel support is removed; replacement supports are no longer installed, thus eliminating the need for replacement supports. Only the concrete supports are cut, retaining the lintel beams, which function as part of the sidewall, allowing them to play a role in both the excavation and main structure construction phases. The bottom slab ribs are adjusted from triangular bevels to stepped shapes, allowing the scaffold uprights to act vertically on the ribs, ensuring the overall stability of the scaffold. The increased rib cross-sectional dimensions reduce the impact of lateral deformation of the foundation pit on the sidewalls. This invention shortens the construction process, reduces construction costs, ensures foundation pit safety, and has good economic benefits.

The utility model discloses a linear locking system with emergency tongue breaking, including the casing, the hollow setting in the casing interior, including locking cavity, drive cavity and transmission cavity, drive cavity inside horizontal fixed mounting has a motor reduction gearbox, locking cavity inside horizontal activity has a screw rod, locking cavity one end is provided with the locking mouth, locking cavity inside is provided with a lock pin in the locking mouth place activity, the hollow setting in the screw rod, the lock pin one end horizontal activity card sets up in the screw rod inside, the screw rod is connected with a screw rod nut through the thread transmission on the screw rod, and the screw rod nut is rotationally arranged in the locking cavity, and the transmission cavity is rotationally connected with a primary gear, and the output end transmission of primary gear and motor reduction gearbox is connected, and primary gear and screw rod nut are connected through the thread meshing transmission, and the break slot is set up in the bayonet of the other end of lock pin. The utility model has the advantages that the impact force can break the lock pin from the break slot position under the emergency, does not affect the blade operation and safety, and the lock pin replacement is more convenient.

The application discloses a dual-mode reduction operation system and method for lattice-based cryptography hardware acceleration, and relates to the technical field of cryptography and information security. The system comprises a routing control unit, which is used for receiving intermediate result data generated in a lattice-based cryptography algorithm operation process, and generating corresponding routing control signals according to the operation type of the intermediate result data, and outputting the intermediate result data and the routing control signals to corresponding data output ends; a first modular reduction operation unit, which is used for executing Montgomery reduction operation based on a prime number condition on corresponding intermediate result data when receiving a routing control signal of modular multiplication operation; and a second modular reduction operation unit, which is used for executing Barrett reduction operation with 2 as a base on corresponding intermediate result data when receiving a routing control signal of modular addition operation. The application can optimize the implementation performance of the algorithm without affecting the security, and is suitable for various software and hardware environments.

The utility model relates to hydraulic technology field especially, and it is the device of pulling and holding with precise release force and buffer function. The device of pulling and holding contains outer tube (2) and internal cavity (8), outer tube (2) and internal cavity (8) can slide and limit each other, the square hole is contained on oil guide rod (709), and the square hole is placed in auxiliary valve bushing (707), and the square hole is connected with the internal space of oil guide rod (709), when the square hole is pushed out valve bushing, the square hole can connect low pressure space (14) and high pressure space (15), guide rod (704) and oil guide rod (709) are installed on the piston and can move together. The device of pulling and holding has the advantages of simple structure, easy maintenance, high reliability, and has the characteristics of repeated use, accurate release.

A driving power supply with a multifunctional protection circuit comprises a rectification module, a conversion module and an output filtering module. The rectifier module is connected with an external power supply. The conversion module is connected with the rectification module. The output filtering module is connected with a load and comprises a filtering unit and a protection unit. The filtering unit is connected with the conversion module. The protection unit is connected with the filtering unit and the conversion module. The protection unit comprises a current limiting assembly and a switch assembly which are connected in parallel.

The invention discloses a quantile differential privacy noise adding method and device, a medium, equipment and a product. The method comprises the steps that according to a preset expression of a user-defined aggregation function UDAF, a plurality of numerical values to be aggregated are obtained, the UDAF is obtained by replacing a quantile function in advance, and parameters of the UDAF and the quantile function comprise the expression and a target quantile; and selecting a target numerical value corresponding to the target quantile from the plurality of numerical values by using a differential privacy index mechanism to obtain a noise-added quantile value of the quantile function. Therefore, the differential privacy noise adding process can be efficient and controllable, the noise adding error influence can be reduced while the safety is not influenced, and the availability of the query result is improved. Besides, when the SQL statement is rewritten, the quantile function containing the noise adding logic is achieved in a UDAF mode, and the problems that rewriting of the SQL statement is complex, and the running error rate of the rewritten SQL statement is high can be solved.

This invention provides a high-temperature disinfection safety protection control method, device, and cloning workstation. The method includes the following steps: initiating the high-temperature disinfection process; calling a software-based primary control module to control the heating mechanism's start and stop, achieving primary high-temperature protection; real-time monitoring of the primary control module's operating status; if the primary control module fails, switching to a programmable hardware-based secondary control module to control the heating mechanism's start and stop, achieving secondary high-temperature protection; real-time monitoring of the secondary control module's operating status; if the secondary control module fails, switching to a pure hardware-based tertiary control module to control the heating mechanism's start and stop, achieving tertiary high-temperature protection and preventing continuous heating. In this technical solution, by establishing a three-level progressive protection architecture, the failure of any control module does not affect overall safety, completely avoiding the risk of continuous heating.

The application provides a multi-component composite electrolyte, a preparation method and application thereof in a zinc ion battery. The preparation method of the multi-component composite electrolyte comprises the following steps: adding acetamide and asparagine into a ZnSO4 solution, stirring and uniformly mixing, and standing to obtain the multi-component composite electrolyte. The application realizes the water-based zinc ion battery with long normal / low-temperature cycle life, stable electrode / electrolyte interface and strong corrosion resistance by the method of compensating the negative influence of kinetics caused by the organic solvent, introducing acetamide into the ZnSO4 electrolyte to improve the wide-temperature-range adaptability of the battery, and introducing asparagine to compensate the reversibility of Zn deposition kinetics.

The embodiment of the present application relates to the field of vehicle technology, and discloses an electronic mechanical braking system and method. It includes a signal processing and fault judgment module, which is used to receive the current vehicle parameters and the duration of the current vehicle parameters, and obtain the fault status information of the current vehicle according to the current vehicle parameters; a braking mode discrimination module, which is used to receive the current vehicle parameters, duration and fault status information of the signal processing and fault judgment module, and obtain the comfort braking activation signal according to the current vehicle parameters, duration and fault status information; a braking control module, which is used to receive the comfort braking activation signal and the current vehicle parameters of the braking mode discrimination module, and correct the braking torque according to the comfort braking activation signal and the current vehicle parameters to obtain the target motor current; an EMB actuator, which is used to receive the target motor current of the braking control module, and perform comfort braking according to the target motor current and feed back the comfort braking result to the signal processing and fault judgment module.

The application provides a non-fluoropolymer, a non-fluoropolymer composite diaphragm and application, the non-fluoropolymer includes polymer A and the polymer B at least partially coated on the surface of polymer A, the crosslinking degree of polymer A is X1, the crosslinking degree of polymer B is X2, 5%≤X1≤10%, 50%≤X2≤60%;The non-fluoropolymer composite diaphragm includes base film and coating layer coated on at least one side of base film.The non-fluoropolymer particles of the application have a higher swelling rate at high temperature, also have the reversible characteristics of absorbing and releasing electrolyte, the non-fluoropolymer and the non-fluoropolymer composite diaphragm are applied in the battery, when the battery abnormally heats, the non-fluoropolymer swells rapidly, blocks the ion shuttle channel, avoids the further deterioration of temperature, improves the safety performance of the battery, and when the temperature returns to normal, the non-fluoropolymer particles can restore to the original morphology, restore the ion shuttle channel, so as to not affect the subsequent cycle performance of the battery.

The utility model relates to a foundation pit supporting structure for staged construction of an underpass road box culvert, which comprises a row pile partition wall arranged in the middle of a road, and the left side of the row pile partition wall is vertically connected with early-stage row pile enclosure walls located on the two sides of an early-stage box culvert foundation pit. The right side of the row pile partition wall is perpendicularly connected with the later-stage row pile enclosure walls on the two sides of the later-stage box culvert foundation pit, the early-stage row pile enclosure walls on the two sides of the early-stage box culvert foundation pit are connected, inclined supporting beams are arranged at the right-angle positions formed by the row pile partition wall and the early-stage row pile enclosure walls, and a temporary retaining wall separated from the row pile partition wall is arranged at the top of the early-stage box culvert. The row pile partition wall and the temporary retaining wall are arranged in the middle of the road for staged construction of the box culvert, it can be guaranteed that half road traffic is not interrupted when the box culvert transversely penetrates through the road for excavation construction, and the temporary retaining wall can guarantee the road structure and traffic safety; local gaps are backfilled with plain concrete, so that backfilled soil between the box culvert structure and the enclosure wall cannot collapse, and the safety of the foundation pit and the road is ensured.

The invention provides a construction method for overall underpinning of a lower foundation of a masonry wall, frame columns are arranged on the two sides of the span of an original masonry wall, a wall foundation is arranged below the original masonry wall, and the construction method comprises the steps that pre-fixing pieces arranged in the span direction are arranged on the two sides of the thickness direction of the original masonry wall, and pre-fixing pieces are arranged on the two sides of the thickness direction of the original masonry wall; the pre-fixing piece penetrates through a wall and is fixed; an upper support changing piece is installed between the frame column and the pre-fixing piece; and a lower support replacing piece is installed between the wall foundation and the pre-fixing piece. According to the construction method, before the underpinning beam under the wall of the original masonry wall is constructed, pre-fixing pieces are installed on the two sides of the original masonry wall in the thickness direction in advance and penetrate through the wall for fixation, and stability and safety of the masonry structure in the construction process are guaranteed; before large-area grooving, the pre-fixing piece is connected with the frame column through the upper support replacing piece, so that the masonry structure has certain self-bearing capacity, the situation that follow-up slotting influences the stability and safety of the structure, located above the pre-fixing piece, of an original masonry wall is avoided, and the construction efficiency is greatly improved.

An antitheft door with an air filtering function comprises an antitheft door body. The anti-theft door body comprises a door frame and a door body. The door body is provided with a window. A cover plate is hinged to the front side of the door body through hinges. And an air filtering structure is arranged in the window. The door body is further provided with a sliding groove, a containing cavity, a mounting cavity and a cavity. And a descending structure is arranged in the door body. The lifting structure comprises a worm, a shaft rod, a rotary knob, a worm gear, an annular lifting frame, two lead screws, two driven gears, two nut seats and two driving gears. And the air filtering structure comprises an annular mounting frame and two filter screens. Activated carbon is filled between the annular mounting frame and the two filter screens. According to the air purifier, air can be filtered, and the safety performance is not affected.