69results about How to "Easy to protect" patented technology

The invention relates to a construction method for a waterproof structure of a high-rise building basement top plate deformation joint. The construction method includes the following steps that a water stop steel plate is arranged at the position of the basement top plate deformation joint in the length direction of the deformation joint; an extruded polystyrene board is inlaid in an upper deformation joint and a lower deformation joint of the water stop steel plate; a concrete top plate is poured; the upper surface of the extruded polystyrene board is compactly filled with waterproof sealing paste in an embedded manner along the deformation joint; face edges of a water stop belt face upwards; a waterproof coil strengthening layer is arranged on the outer side of the rubber water stop belt; and a waterproof layer is arranged on the outer side of the waterproof coil strengthening layer. According to the construction method, the problems that when the concrete top plate and the external bonding water stop belt are constructed at the same time, the external bonding water stop belt is likely to be deflected, concrete at the lower side portion of the water stop belt is not vibrated compactly, the protection cost of the external bonding water stop belt and a finished sealing paste product is high, and repairing is difficult after damage is caused are solved; the upper portion of the top plate is made into a slope concrete returning table, water draining on the surface is facilitated, and the seepage probability is lowered; and the phenomenon that body structure construction is affected due to cross operation of relevant processes is avoided, limitation on the construction time is avoided, and the overall construction quality is ensured.

The invention relates to tailoring equipment and in particular relates to leather shoe shell fabric tailoring equipment for leather shoe processing. The invention aims to provide the leather shoe shell fabric tailoring equipment for leather shoe processing, wherein the position of the leather shoe is easily fixed when the leather shoe is formed and the equipment is conveniently used by shoe-making personnel. In order to solve the technical problem, the invention provides the leather shoe shell fabric tailoring equipment for leather shoe processing. The leather shoe shell fabric tailoring equipment for leather shoe processing comprises a top plate, a tailoring device, a bottom plate, a placing table, a clamping device and the like, wherein the placing table is arranged on the top of the bottom plate, the top plate is arranged right above the bottom plate, the tailoring device is arranged on the bottom of the top plate, and the locking device is mounted on the bottom of the tailoring device. The equipment provided by the invention is simple to operate and convenient for the shoe-making personnel to use, and a new tailoring blade is conveniently replaced by the shoe-making personnel and the tailoring blade can be fixed well.

The invention discloses an indoor decoration manual wall grooving machine convenient to carry and store. The indoor decoration manual wall grooving machine comprises a grooving device body, a water spraying head, a connecting hose, a fixing head, a handle, a sliding channel, a baffle, a first sliding wheel, a sliding block, a protection plate, a cutting tool, a stepping groove and a water sprayingpipe. A fixing cover plate is arranged above the left side of the grooving device body. The water spraying head is arranged on the left side of a sliding ring. The connecting hose is located below the water spraying head. The sliding channel is located at the upper portion of the interior of the fixing base. The baffle is located at the right end of the sliding channel and the right end of the first sliding groove. The first sliding wheel is located at the lower end of the fixing base. The water spraying pipe is located on the inner side of the water spraying head. By means of the indoor decoration manual wall grooving machine convenient to carry and store, the grooving machine is arranged to be in an adjustable manner, control over the grooving machine of a user is facilitated, in addition, the grooving machine is arranged to be in a storable and foldable manner, and therefore storage of the grooving device body is facilitated.

The invention discloses a minimally invasive endoscope anastomat with an anti-slip grip. The minimally invasive endoscope anastomat comprises a main body structure and an adjusting mechanism, wherein the main body structure comprises an endoscope anastomat main body, a sliding groove, a reset clamping block, a safety groove, a safety catch, a fixed handle, a percussion handle, limiting circular rings, an anti-slip sleeve and a rubber pad, wherein the safety groove is formed below the sliding groove; the safety catch is arranged in the safety groove; the fixed handle and the percussion handle are arranged at the bottom of the endoscope anastomat main body; the fixed handle is arranged below the safety groove; limiting grooves are uniformly formed in the top of a cover shell; and the bottom end of a rotating rod penetrates through a first bevel gear and is rotationally connected with the inner bottom of the cover shell. According to the minimally invasive endoscope anastomat with the anti-slip grip, the limiting circular rings are arranged, and the fingers of a user can be conveniently separated and limited through the multiple limiting circular rings, so that the percussion handle can be conveniently prevented from accidentally slipping off from the hand of the user in the operation process, a patient can be conveniently protected, and meanwhile the internal structure of the anastomat can be conveniently optimized.

The invention relates to an intelligent control circuit of an agricultural greenhouse, in particular to an intelligent control circuit of an agricultural greenhouse geothermal heating system. The intelligent control circuit comprises a power supply circuit, a temperature control circuit, a water shortage auto-stop circuit, a control output circuit and an open-phase protection circuit. The upper limit temperature signal end of the temperature control circuit is connected to the second input end of an OR gate c through an isolating diode a; the lower limit temperature signal end of the temperature control circuit is connected to the input end of an OR gate a; the output end of the OR gate a is connected to the first input end of the OR gate c; the output end of the OR gate c is connected to the input end of an OR gate b; the output end of the OR gate b is connected to the second input end of the OR gate c through an isolating diode b; the output end of the OR gate c is connected to a base of a triode a through a drive resistor a; a collector of the triode a is connected to a first relay coil; a normally open contact of a first relay is connected between the control end a and the control end b. The intelligent control circuit allows the agricultural greenhouse geothermal heating system to automatically run, and the environment good for growth of fruits and vegetables is created for the agricultural greenhouse.

A self-cleaning multi-angle photovoltaic power generation device includes a fixed base, a cover plate, a first photovoltaic panel and a lightning protection lead, The upper end of the fixed base is connected with a spring, the upper end of the spring is installed with a power storage box, the cover plate is fixed on the outer side of the connecting ring, the outer surface of the cover plate is provided with a rust prevention layer, the first photovoltaic plate is installed on the left side of the connecting rod, the right side of the connecting rod is installed with a second photovoltaic plate, and the lightning protection lead is installed on the inside of the connecting rod. The self-cleaning multi-angle photovoltaic power generation device is provided with a rust-proof layer on the outer surfaces of the power storage box and the cover plate so as to prolong the service life of the device, thereby preventing the device from being corroded in rainy days which may influence the servicelife of the device. The first photovoltaic plate and the second photovoltaic plate can rotate through a connecting rotating shaft, thereby facilitating the conversion of the working angle of the device, and greatly improving the practicability of the self-cleaning multi-angle photovoltaic power generation device.

The embodiment of the invention provides an information processing method and a terminal. The method comprises the steps that when target information for a target application is received, whether the target application has a corresponding cloned application or not is judged; if the target application has the cloned application, judging whether a received object of the target information is a cloned application or not is judged; if the received object is the cloned application, the cloned application is indicated to receive the target information. According to the information processing method, information can be protected conveniently.

The invention provides a cable winding and unwinding device for electric power emergency repair, and belongs to the technical field of electric power construction auxiliary equipment. The device comprises a box body, a roller and a crank, wherein the roller is rotationally connected with the interior of the box body, the roller is detachably connected with the box body, the crank is located outside the box body and coaxially connected with the roller, the crank is detachably connected with the roller, and a plurality of wheels are arranged on the lower portion of the box body; a movable pull rod is further arranged on the box body, and the movable pull rod is connected with the box body through a universal hinge structure. By means of the device, the cable winding and unwinding speed can be effectively increased, the work efficiency of workers during electric power emergency repair can be improved, the emergency repair time is saved, and the economic loss caused by overlong emergency repair time is avoided.

The invention provides a construction device and method of a double-curved-surface arch-shaped concrete wall, and relates to the field of double-curved-surface arch-shaped wall construction. The construction device of the double-curved-surface arch-shaped concrete wall comprises a plurality of arc-shaped steel supports arranged along a horizontal arc line at intervals, a plurality of inner side transverse wooden edges arranged at intervals are fixedly connected to the outer side surfaces of the arc-shaped steel supports, layers of inner side longitudinal wooden edges are fixedly connected to the outer side surfaces of the inner side transverse wooden edges, the outer side surfaces of the inner side longitudinal wooden edges are laid with layers of inner formworks, wall steel bars are bond to the outer side surfaces of the layers of inner formworks, the outer side surfaces of the wall steel bars are laid with layers of outer formworks, and concrete linings are arranged between the inner formworks and the outer formworks. A plurality of outer side longitudinal wooden edges arranged at intervals are arranged along the outer side surfaces of the outer formworks, the outer side surfaces of the outer side longitudinal wooden edges are laid with layers of outer side transverse wooden edges, and concrete is poured between the inner formworks and the outer formworks to obtain the double-curved-surface arch-shaped concrete wall. According to the construction device of the double-curved-surface arch-shaped concrete wall, safe, economic and efficient construction of a double-curved-surface arch-shaped wall structure can be realized.

The invention discloses a method of privacy data protection of multi-card cellphones, which is characterized in that the method includes the following steps: in the process of generating privacy data, the generated data takes the ID of a belonging card as identity attribute parameters; a privacy management unit sets a SIM / UIM card needing protecting to record the ID needing protecting and save in the memory of the cellphone; the user requests to visit the privacy data; a privacy data filtering unit filters the privacy data associated with the card to filter the privacy data records that are in accordance with the filter conditions and provide the user visit. According to the method, the cellphone owner can protect the privacy data associated with the whole card needing protecting so that other users cannot visit the privacy data but the cellphone owner can conveniently visit the privacy data. The cellphone owner can conveniently select all privacy data of different cards hidden and protected under different use conditions, which has very high security and brings convenience to protect privacy data for multi-card cellphone users.

The invention discloses a steel wire rope cross-fixation device used for wire rope net, i.e. a cruciform latch which comprises an upper latching sheet (1), a lower latching sheet (2), and at least two claws (3) equipped at the bottom of the upper latching sheet (1) and / or the lower latching sheet (2). The bottom surfaces of the upper latching sheet (1) and the lower latching sheet (2) are shaped to a depressed arc surface. Crisscross grooves are correspondingly formed on the inner surfaces of the upper and the lower latching sheets. The circumferences of the upper and the lower latching sheets extend along the crisscross grooves out of the claws (3), forming a smooth notch (5) when the upper and the lower latching sheets are closed oppositely. The steel wire rope cross-fixation device solves the problem that the steel wire rope is easy to be damaged in the prior art, and has the advantages of good appearance, reduced material consumption, no need of perforation and low processing cost.

Provided is a fuel cell system which can ventilate the interior of a housing through a simple configuration, and can limit suction of combustion gas into the housing even if combustion gas stagnates outside of the housing. A fuel cell system comprises a reformer (21) for producing reformed gas from combustion gas, a fuel cell (11) generating power from reformed gas and oxidizer gas, a cooling passage (80) opening to the outside of a housing (70) and cooling the interior of the housing by introducing cooling air to the housing space in the housing via an inverter system (15), an air blower (31) for introducing cooling air to the cooling passage from the outside of the housing, and a breaker for interrupting the circuit to a power supply line upon occurrence of an abnormality in the fuel cell system or during maintenance, wherein the housing houses the reformer, the fuel cell, the inverter system, the air blower and the breaker in the housing space, and cooling air introduced from the outside of the housing by the air blower is introduced to the housing space while cooling the inverter system, thus maintaining the pressure in the housing space higher than the atmospheric pressure.

The invention relates to a multifunctional robot wrist with a replaceable end actuator. The multifunctional robot wrist is aimed at solving the problems that in the prior art, most robot wrists are connected with end actuators, so that the function that one wrist drives various end actuators can not be achieved, manufacturing cost is high, and using is inconvenient. The multifunctional robot wrist comprises an outer power output mechanism, a middle locking and unlocking mechanism, an inner power output mechanism and a tool mechanism. The outer power output mechanism and the middle locking and unlocking mechanism are sequentially arranged on the inner power output mechanism from outside to inside in a sleeving mode. The tool mechanism is installed at the power output end of the outer power output mechanism, the power output end of the middle locking and unlocking mechanism and the power output end of the inner power output mechanism. The multifunctional robot wrist is applied to the field where end actuators need to be replaced and actuators need to be locked.

The invention relates to a recovering device, in particular to a recovering device for waste batteries. According to the recovering device for the waste batteries, the waste batteries are convenientlystored. The recovering device for the waste batteries comprises a mounting frame, a first baffle, a mounting rack, a second baffle, a hollow rod, a fixing mechanism, a storing plate, a first elasticpiece, a shaking mechanism, a first locking mechanism, a second locking mechanism, a pull line and a pull ring. One end of the first baffle is hinged to one side portion of the mounting frame, the first locking mechanism is fixedly connected to the front portion of the first baffle, and the output end of the first locking mechanism is matched with the front portion of the mounting frame. The mounting rack is fixedly connected to the inner bottom of the mounting frame through the shaking mechanism, and one end of the second baffle is hinged to one side portion of the mounting rack. The effect that the waste batteries are conveniently stored is achieved.

The invention provides a stamping device with a protection function for whole automobile manufacturing, and relates to the field of automobile manufacturing. The stamping device with the protection function for whole automobile manufacturing comprises a base. Vertical rods are fixedly installed on the two sides of the top of the base. The tops of the two vertical rods are fixedly connected through a transverse plate. A telescopic rod is fixedly installed at the bottom of the transverse plate. A pressing block is fixedly installed at the bottom of the telescopic rod. The two sides of the pressing block are provided with conductive plates correspondingly. According to the stamping device with the protection function for whole automobile manufacturing, by arranging the conductive plates, buzzers, inserting rods, conductive blocks, a sliding plate, springs, supporting rods, connection rods, rollers, damping springs and clamping blocks, the effect of conveniently protecting the stamping device for whole automobile manufacturing is achieved, a stamped part and the device are prevented from being damaged in the using process, and therefore the using efficiency of the stamping device for whole automobile manufacturing is improved.

The invention provides an alarm processing method and device, electronic equipment and a computer readable storage medium. The invention relates to a security technology in the cloud technology field.The method comprises the following steps: receiving an alarm query request for a service, and obtaining a plurality of alarm records of the service; performing keyword extraction processing on the alarm record according to an attack lexicon of the service to obtain attack keywords; determining the similarity between different alarm records according to attack keywords in the alarm records; and performing clustering processing on the plurality of alarm records according to the similarity to obtain a plurality of alarm record clusters. Through the application, the main reason why the service isattacked can be accurately and effectively reflected according to the plurality of alarm record clusters, so that the service can be conveniently subjected to security protection, and meanwhile, thecomputing resources of the electronic equipment can be effectively saved.

The invention discloses a pruning machine speed regulation control method. The pruning machine speed regulation control method comprises that a power supply system is established and started to issue triggering signals; a center processor detects the voltage of the power supply system to determine whether to maintain operation of the power supply system and further to transmit output maintaining signals; a speed regulating trigger button is pressed, and the central processor converts speed regulating signals transmitted by the speed regulating trigger button into electric signals for speed judgment; driving signals are issued after motor position signals are detected to control rotation of a motor; a sampling resistor converts current into voltage signals and inputs the voltage signals into the central processor to control the motor to rotate at a certain ratio or the highest power. Therefore, the pruning machine speed regulation control method can help enter an energy saving mode and achieve a low output power during idle load, and enter a constant-power mode during full load to maintain the operating current of a pruning machining at the highest power, so that the pruning machine is easy to protect and smooth in operation, and the problem of idle load power consumption and protection simplicity of the pruning machine can be well solved.

The invention provides a protective circuit for cascade of multiple battery strings. The protective circuit comprises a chip port voltage withstand protection circuit. A first resistor of the chip port voltage withstand protection circuit is connected with a battery pack negative terminal and a negative terminal of a first diode. A positive terminal of the first diode is connected with a ground end. A drain terminal of a first NMOS (N-channel metal oxide semiconductor) transistor of the chip port voltage withstand protection circuit is connected with a negative terminal of the first diode, a source terminal and a substrate in the first NMOS transistor are short-circuited and are connected with a battery pack negative terminal detection end, and a gate terminal of the first NMOS transistor is connected with a power terminal. A gate end of a second NMOS transistor of the chip port voltage withstand protection circuit is connected with a control terminal of a charge tube, a source terminal and a substrate in the second NMOS transistor are short-circuited and are connected with the ground end, a drain terminal of the second NMOS transistor is connected with a second resistor, and the second resistor is connected with the power terminal. A gate terminal of a PMOS (p-channel metal oxide semiconductor) transistor of the chip port voltage withstand protection circuit is connected with the drain terminal of the second NMOS transistor, a source terminal and a substrate in the PMOS transistor are short-circuited and are connected with the power terminal, and a drain terminal of the PMOS transistor is connected with a positive terminal of a second diode. A negative terminal of the second diode is connected with a gate terminal of the charge tube. A source terminal and a substrate in the charge tube are short-circuited and are connected with a battery pack negative terminal, and a drain terminal of the charge tube is connected with a drain terminal of a discharge tube. A source terminal and a substrate in the discharge tube are short-circuited and are connected with the ground end, and a gate terminal of the discharge tube is connected with a discharge tube control terminal. Very high positive voltage and very low negative voltage are prevented from entering a battery protection chip, and a safe and reliable multi-string battery protection scheme is formulated.

The invention relates to the field of coating production, in particular to a coating production line. The coating production line comprises a conveying device, a pretreatment device, a spraying device and a curing device, wherein the pretreatment device, the spraying device and the curing device are sequentially arranged on the conveying device, the pretreatment device can be used for cleaning the surface of a workpiece, and the curing device can be used for drying and curing the sprayed surface of the workpiece; the spraying device comprises a machine body, a spraying mechanism and a rotating mechanism; the rotating mechanism comprises a rotating part, a rotating shaft, a rotating disc, a plurality of supporting rods and two semicircular connecting plates, one end of the rotating shaft is rotationally connected to the bottom wall of a feeding channel, the other end of the rotating shaft is arranged on the rotating disc, the plurality of supporting rods are vertically arranged on the rotating disc, and the two connecting plates are arranged at the ends, away from the rotating disc, of the supporting rods and arranged on the two sides of the feeding channel respectively; the rotating part is arranged on the bottom wall of the feeding channel and can enable the rotating shaft to rotate; and the spraying mechanism is arranged on the supporting rods and can conduct spraying on the portion between the two connecting plates. According to the coating production line, the surface of a product can be sprayed more uniformly.

The invention relates to a fabricated type indoor partition wall structure and a construction method thereof. The fabricated type indoor partition wall structure comprises a first steel rail arrangedon a ceiling and a second steel rail which is arranged on the ground and is opposite to the first steel rail, inner plate mechanisms formed in a splicing manner are slidably connected to the first steel rail and the second steel rail, limiting mechanisms used for limiting the positions of the adjacent inner plate mechanisms are arranged among the adjacent inner plate mechanisms, and outer plate mechanisms are arranged among the adjacent limiting the positions; and each inner plate mechanism comprises a first connecting rod of which the two ends slide on the first steel rail and the second steel rail through sliding assemblies, a first inner plate inserted into the first connecting rod, an inner plate assembly which is inserted into the first inner plate and penetrates through the first connecting rod, a second inner plate which is inserted into the first connecting rod and matched with the first inner plate and the inner plate assembly, a first fastening assembly which is arranged on the first inner plate and used for limiting the inner plate assembly and a second fastening assembly inserted into the inner plate assembly and the second inner plate. According to the fabricated typeindoor partition wall structure and the construction method thereof, materials can be recycled.

The invention discloses a Bluetooth dust mask. A mask body is in the shape that the middle portion protrudes, and the two sides are symmetric. The Bluetooth dust mask comprises the mask body, a nose clip, filters, a Bluetooth system, double-valve controllers and an interlayer. The mask body comprises a front face mask and a rear connecting piece. The upper end of the face mask is provided with the rotary nose clip, and the lower portion of the face mask is provided with the two symmetric double-valve controllers. The Bluetooth system comprises a Bluetooth controller close to the interlayer, loudspeakers close to the ears and a microphone close to the mouth. The Bluetooth controller comprises a Bluetooth receiving and control part and a power supply. The outer side face of the face mask is provided with 1-40 air holes, and the inner side of the face mask is provided with the filters which are connected and fixed through the double-valve controllers. The interlayer is arranged in the connecting piece. A hook and loop fastener is arranged on the outer side of the connecting piece. Each double-valve controller comprises valves which exhaust air from the left side and the right side respectively in one direction. In this way, the Bluetooth dust mask has the functions of dust preventing and filtration and Bluetooth answering.

The invention relates to the technical field of auto parts and discloses a device for clamping auto parts for production. The device comprises a base. A placing table is fixedly mounted on the top ofthe base, clamping seats are fixedly mounted on the left and right sides of the top of the base, a movable groove is formed in each clamping seat, an open slot communicating to the movable groove is formed in the top of each clamping seat, and a movable seat is fixedly mounted on the top of each clamping seat. According to the device for clamping the auto parts for production, as slots are formedin the clamping seats, an effect of enhancing firmness of the auto parts by a push rod is facilitated and the risk that the push rod rebound to hurt people as a result of a counteraction force of a spring is avoided. By arranging the push rod on the movable seat, the push rod is pulled to clamp the auto parts, so that the condition of wasting labor and time to clamp the auto parts by rotating a screw rod conventionally is avoided. The structural design is simple and convenient to operate, and improves the work efficiency effectively.

The invention discloses a teaching display device convenient to move. The device comprises a fixing base. The top end of the fixing base is fixedly connected with a lifting rod. The lower ends of twosides of the lifting rod are fixedly connected with second fixing plates. One end of the second fixing plate, far away from the fixing base, is inserted with a screw. One end of the screw, close to the second fixing plate where the screw is, passes through the second fixing plate where the screw is and the fixing base, and extends to the bottom end of the fixing base. The invention provides a display device. Through arranging a bottom plate and a pressing plate on a third fixing plate, placing samples which need to be displayed when a teacher gives a class is convenient, and giving a class tostudents is prevented from being influenced by holding the samples by hands of the teacher. Through arranging the cover plate on the third fixing plate, displayed samples are protected, and the samples are prevented from being damaged by accidents. Through arranging universal wheels on the lower end of the fixing base, the samples can be easily moved.

The invention relates to ray protection bed plate for use during CT (Computerized Tomography) scanning. The ray protection bed plate is characterized in that: the protection bed plate is provided with a panel (1), wherein a front end plate (2) and a back end plate (3) are arranged below the front end and back end of the panel (1) respectively; a support plate (4) is arranged below the panel (1); the upper end face, the front end face and the back end face of the support plate (4) are fixed together with the panel (1), the front end plate (2) and the back end plate (3) respectively; the support plate (4) is provided with a hollowed groove (5); a lead sheath (6) passes through the middle of the hollowed groove (5); and the lead sheath (6) is wound on the body of a patient lying on the panel by a cycle through the panel (1) and the patient, so that a radiation protection effect is achieved. During CT examination, every part of the patient can be protected conveniently; for example, during chest scanning, the lead sheath is moved to the abdomen and the pelvic cavity of a patient for protecting; and during waist-abdomen scanning, the lead sheath is moved to the chest and pelvic cavity of the patient respectively for protecting. The protection bed plate is simple in structure, is convenient to use, has a proper protection function, and is the next developing direction of a CT apparatus patient bed for protecting.

The invention discloses a distributed harbor bank charging device. The device comprises a mounting base, a charging pile is fixedly connected to the center of the upper surface of the mounting base; aprotection mechanism is mounted on the upper surface of the mounting base and located outside the charging pile; a lifting mechanism is mounted on the protection mechanism. When the device is used, the internal charging pile is protected through the protective cover; meanwhile, the protection plate and the air draft sleeve can be driven by the first driving motor to ascend; then the positioning rod is popped into the positioning groove under the action of the spring; fastening an air draft sleeve, at the moment, a second driving motor is started to drive fan blades to rotate to pump out moisture entering the protective cover; and after dehumidification is finished, a first driving motor rotates reversely to drive an air draft sleeve and a protection plate to reset, at the moment, a shielding plate abuts against a rubber sealing ring, ventilation on the protection cover is protected, humid air or seawater is prevented from entering the protection cover through a through hole, and thenthe charging pile in the protection cover is protected.

The invention relates to a method for blanking a cylindrical formwork at a joint part of a V-shaped cylinder, which comprises the steps of 1, establishing a coordinate system and determining a mathematical expression of a cutting contour line; 2, determining semi-elliptical cutting points at a lower half portion of the cylindrical formwork, and determining a cutting point at the lower half portion of the cylindrical formwork according to the mathematical expression of the cutting contour line and a value range of a horizontal coordinate of the cutting point, wherein an H-value and an L-value are acquired correspondingly every time when a value is assigned to the horizontal coordinate of the cutting point; and 3, determining a series of cutting points according to the method provided in the step 2, and carrying out cutting along the cutting point in sequence so as to realize blanking of the cylindrical formwork at the joint part of the V-shaped cylinder. The method provided by the invention can accurately control the precision of the cutting contour line, thereby effectively avoiding deviation at the joint part of two cylindrical formworks.

The invention relates to a preparation method of (2R,3R)-1,4-dimethoxyl-1,1,4,4-tetraphenyl-2,3-butanediol and (2S,3S)-1,4-dimethoxyl-1,1,4,4-tetraphenyl-2,3-butanediol, which comprises the steps of preparing chiral 1,1,4,4-tetraphenyl butantetraol by carrying out hydrocarbylation on antipode purity (2R,3R)-tartaric ester and (2S,3S)-tartaric ester with a phenyl Grignard reagent; and then reacting with a boron compound in the presence of a metal compound or an amino compound to generate chiral spiral borate to obtain the (2R,3R)-1,4-dimethoxyl-1,1,4,4-tetraphenyl-2,3-butanediol and (2S,3S)-1,4-dimethoxyl-1,1,4,4-tetraphenyl-2,3-butanediol with high yield. The method has the remarkable characteristics of easy obtaining of raw materials (no need of special reagents or expensive reagents), simple process, convenient and simple operation, good reaction selectivity, high yield of products, and the like.

The invention provides a wall cutting device for building construction. The wall cutting device for building construction comprises a movable plate, a motor, a cutting blade, I-shaped rods, pulleys, afiltering net and a spring. The left end of the movable plate is connected with a fixed frame through a guide rod, the movable plate is connected with the upper end of the fixed frame through an electric telescopic rod, the motor is installed on the movable plate through bolts, the cutting blade is installed at the front end of the motor, the I-shaped rods are connected with a base through rotating shafts, the pulleys are installed on the I-shaped rods, the filtering net is assembled in a protecting plate, the left end of the spring is connected with the movable plate through a baffle, and the right end of the spring is connected with the left end of the protecting plate. The wall cutting device for building construction is conveniently used for cutting a wall, is convenient to protect and move, and has good stability. The wall cutting device for building construction is convenient to use, is conveniently used for cutting the wall, is convenient to protect and move, and has good stability and high reliability.

The invention discloses a protective device used for coal mine mining and preventing waste residues from falling. The protective device used for coal mine mining and preventing the waste residues fromfalling comprises an air pump and a protective cover, the air pump is mounted in a base block, a banding block is fixed to the output end of the air pump, and the edge end of the banding block is connected with an air bag through a banding line. The air bag is located above the air pump, a fixed disk is mounted at the edge of the air bag, a clamping groove is reserved above the base block, and the fixed disk is mounted in the clamping groove. The protective cover is arranged on the outer side of the air bag, a clamping column and a butting groove are correspondingly formed in the edge sides of the protective cover, and the clamping column is mounted in the adjacent butting groove. A fixed block and a clamping seat are correspondingly mounted at the edges of the top of the protective cover, and the fixed block is connected with the clamping seat through a fixing piece. According to the protective device used for coal mine mining, underground coal mining personnel are conveniently protected, falling of coal residues is prevented from bringing potential safety hazards to the mining personnel, and meanwhile, the trouble of coal mine frame assembly is avoided.