35results about How to "Easy and safe to operate" patented technology

A material position information measuring section measures a position of a material lifted up by a tower crane. A structure information measuring section measures position information about surrounding structures. A route searching section searches for a route of movement of the material from a start point to a destination. The route of movement determined by the route searching section is stored in a route storage. A data processor receives data of the material position information measuring section and the structure information measuring section, and calculates 2D or 3D image data about relative positions of the tower crane, the material lifted up by the tower crane and the surrounding structures. A display unit displays information about at least one of the tower crane, the material and the surrounding structures using the image data calculated by the data processor, and displays the route of movement determined by the route searching section.

The invention provides a concretion method for ultra-soft foundation, comprising the steps as follows: geotextile is paved on the soft foundation and a bamboo rod grid is paved on the geotextile; plastic drainage plates are inserted; horizontal water permeable pipes are paved; the plastic drainage pipes are close to and surround the horizontal water permeable pipes, and are connected to a vacuum-pumping device; a vacuum film is covered and pressed and the vacuum is pumped. By adopting the concretion method provided by the invention, compared with the construction which adopts normal types (such as vacuum pre-pressing method or pile loading pre-pressing method) at home and abroad, as the sand cushion layer is not used, the construction can save manufacture cost by 35-70RMB/m<2>, furthermore, shorten the construction period by more than 20%, and ensure convenient and safe operation.

A machine and method for horizontally stretching and exercising the human body, specifically the human frame or torso. The machine comprised a bed, table, or platform having three main sections: an upper stationary section upon which user's upper body is physically attached, an actuated lower section which receives the user's lower body, and a slack section, including an upright projection, disposed at the end of the lower section of the bed, table, or platform. A strap or similar device is connected between a pelvic harness worn by the user and the upright projection of the slack section. While lying atop the upper and lower sections of the machine, the user self-actuates movement of the lower and slack sections of the machine away from (or towards) the upper body, thereby causing the strap to pull upon (or loosen from) the user's trunk or midsection. Because the user's upper body is physically attached to the stationary upper section of the machine, the user's trunk is effectively stretched and exercised by outward movement of the strap to the extent desired by the user.

The invention relates to a seating-type internal mixer which comprises a base, a mixing chamber, a transmission mechanism, rotors, a discharging mechanism, a feeding chamber, a material pressing mechanism and a feeding mechanism, wherein the mixing chamber is mounted above the base; the two rotors are mounted in the mixing chamber; the transmission mechanism is mounted on one side of the mixing chamber; the feeding chamber is mounted above the mixing chamber; the feeding chamber is communicated with the mixing chamber; a feeding door is arranged on one side of the feeding chamber; the feeding mechanism drives the feeding door to move upwards to open the hermetically sealed feeding chamber. According to the seating-type internal mixer, the structural design is reasonable and compact, the advantages of a falling type internal mixer and a turnover type internal mixer are integrated, the structural defects of the conventional internal mixer are overcome, the production speed is high, the requirement on the height of a factory space during installation is low, the space is economized, the mixing capacity is high, the mixing time is short, the production efficiency is high, the degree of automation is high, the product quality and the working environment are improved, the operation is safe and convenient, the labor intensity is reduced, and the labor cost is reduced.

The present invention relates a refuge used in underground mines, and more particularly to a type of isolated refuge cabin used in underground mines, including the supporting airbag (1), the body shell (2) equipped outside the supporting air bag (1), a breathable air supplier (4) and an air inflation device (3); the air outlet (5) of the air inflation device (3) is linked with an air outlet (7) of the supporting air bag (1) through an air supply passage(6); the air inlet (8) of the breathable air supplier (4) is connected to the interior cavity of the body shell (2) through an air intake passage (9); the air outlet (10) of the breathable air supplier (4) is linked with the lower part of the interior cavity of the body shell (2) through the air outlet passage(11); the breathable air supplier (4) includes a shell (12), the oxygen generating agent (13) equipped inside the shell (12); the emergency exit (14) is installed on the body shell (2). The present invention provides an isolated refuge cabin of a simple structure, which can be operated safely and easily to effectively separate the exterior environment of the mining accident areas and provide conditions for survival for human beings involved in the mine accidents.

The invention provides a track flatness measuring method. The method includes the following steps of (1) placing a walking mechanism with an acceleration sensor, an angular velocity sensor, a magnetic sensor on a track, and moving the walking mechanism to the corresponding position; (2) acquiring the original data of the acceleration sensor and the angular velocity sensor, and obtaining the pitch angle, the yaw angle and the roll angle of the walking mechanism according to the original data; and (3) determining whether the pitch angle, yaw angle, and roll angle obtained in step (2) within the standard threshold interval, and if the angles are in the standard threshold interval, the track is flat, if not, the track is not flat. The track flatness measuring method can intelligently determine the flatness of the track installation and realize the simplicity, safety and efficiency of the operation of the track installation and detection.

The invention discloses a supercapacitor-used nickel vanadate material preparation method, which comprises steps: 1, ammonium vanadate is dissolved in a solvent, nickel nitrate is added, and a reaction precursor solution is obtained; 2, a basic structure directing agent is used to adjust the pH value of the reaction precursor solution to 7 to 12, and by uniform mixing, a reaction mixed solution isobtained; and 3, the reaction mixed solution is transferred to an autoclave, reaction for 8 to 15 h under 100 to 180 DEG C is carried out, and a product nickel vanadate material is obtained. A one-step hydrothermal method is adopted, multiple alkaline reagents are used as structure directing agents, the nickel vanadate material is obtained through adjusting the pH, the operation is simple and safe, the cost is low, and the product purity is high. The invention also discloses a flower-like nickel vanadate material, the material presents a flower-like structure with lamellar layers, the specific surface area is large, the conductivity and the surface permeability are good, and multiple reactive sites exist. The invention also discloses application of the flower-like nickel vanadate materialas a supercapacitor electrode material, the specific capacitance is high, capacity retention and rate performance are good, and the electrochemical impedance is low.

The invention discloses an irradiation cross-linking low-smoke halogen-free sheath material for a photovoltaic cable, wherein the irradiation cross-linking low-smoke halogen-free sheath material comprises the following components in parts by mass: 10-30 parts of an ethylene-vinyl acetate copolymer, 5-20 parts of ethylene propylene diene monomer, 5-20 parts of high-density polyethylene, 5-30 partsof aluminum hydroxide, 5-35 parts of magnesium hydroxide, 1-10 parts of diethyl aluminum hypophosphite, 1-5 parts of a compatilizer, 0.5-3 parts of a cross-linking sensitizer, 0.5-2 parts of an antioxidant, 1-5 parts of a lubricant and 2-5 parts of carbon black. By adding the components according to the specific ratio, the sheath material ensures good mechanical properties and good processabilitywhile prolonging the service life and enhancing the light transmittance and the flame retardancy in smoke.

Belonging to the field of catalytic chemistry, the invention relates to a preparation method of a supported heteropolyacid catalyst. The method includes the steps of: dipping a carrier material in a heteropolyacid aqueous solution and performing stirring to obtain a pulp; placing the pulp in a N2 environment, raising the temperature and increasing the pressure to make N2 reach a supercritical condition and sustaining the state for 2-6h to obtain a catalyst crude product; and separating and drying the catalyst crude product to obtain the supported heteropolyacid catalyst. In addition, the invention also relates to the supported heteropolyacid catalyst prepared by the method and application thereof in conversion of glycerin to acraldehyde. The method has the advantages of simple operation, mild conditions, and good safety. The prepared supported heteropolyacid catalyst has good dispersibility, high catalytic activity, and is easy to recover. The reaction of conversion of glycerin to acraldehyde under the catalysis of the catalyst achieves excellent conversion rate, selectivity and yield, and effectively alleviates the loss of the catalyst active components.

The invention discloses a preparation method of an asymmetric aromatic azo compound. The preparation method comprises the following steps: performing condensation on aromatic hydrazine and aryl halide which are used as raw materials in a dichloromethane two-phase system of a solid base catalyst to obtain asymmetric disubstituted hydrazine, and performing catalytic oxidation on the asymmetric disubstituted hydrazine to prepare the asymmetric aromatic azo compound. The asymmetric aromatic azo compound prepared by the preparation method has the yield of above 85% and the purity of 98% and above; compared with the prior art, the preparation method is safe, simple and convenient to operate, greatly improves an operating environment, and avoids of a dangerous diazotization step; moreover, the method is mild in reaction condition, good in selectivity, easy in process control and stable in product quality, can recycle and reuse unreacted organic raw materials, and greatly reduces the treatment intensity of environment-friendly COD, thereby being suitable for industrial production.

The invention discloses a synthesis method of gastrodin. The synthesis method of the gastrodin comprises the following steps: putting 4-formylphenyl-2,3,4,6-tetra-0-acetyl-beta-D-glucopyranoside and a reducing agent into a solvent, and conducting reaction at 0 to 30 DEG C for 0 to 3 hours; after complete reaction, adding water and performing quenching reaction; separating and taking an organic phase, concentrating the organic phase under the vacuum condition, and adding methanol in amount which is 2 to 5 times that of the organic phase; adding organic amine, performing refluxing reaction and performing alcoholysis; after complete reaction, adding activated carbon to decolor, filtering, concentrating, crystallizing and drying. By adoption of the synthesis method provided by the invention, the processes of the production process are reduced, and the method is safe, simple and convenient in operation, low in cost, low in pollution and suitable for large-scale production; furthermore, the prepared gastrodin product has stable quality and the purity is 99.9 percent or higher.

A preparing method of the functional quanta point to identify the tumor cell specially belongs to the nanometer material and biological field. The method includes the below process: (1) preparing the CdS quanta point; (2) modifying the surface by small molecular compound with the mercapto; (3) the functional modification to the quanta point surface: add the DMSO solution with the NHS and the EDC to form a high activity midbody which can react with the amido in the folic acid. The mercapto can improve the water solution. So the fluorescent quanta point can identify the tumor cell expressing the high level folic acid acceptor, so it can be used as the fluorescent probe in cell biological study.

Aiming at the problems that a conventional supercutical fluid reaction kettle is inconvenient to operate and security protection devices are insufficient, the invention discloses horizontal supercutical fluid foaming equipment which mainly consists of a tank component, a hoop component, a pressing component, a track and a rack, wherein the tank component is horizontally arranged; the whole tank component is sealed in a hooped manner; the hoop component and the pressing component are matched with the track and the rack and are arranged with the tank component in a linear manner; the hoop component and the pressing component are moved in a track direction; and the hoop component is matched with the end part of the tank component through guide of the track; the pressing component is mounted in the hoop component along guide of the track. By adopting the equipment, the track is adopted for horizontal movement matching, a tank is locked by using a dual structure, and the operation of the device is facilitated; and the tank is provided with pressure, temperature and security protection devices and gas recycling device mounting interfaces, and real-time monitoring and security protectionin the processing process can be achieved. The equipment is applicable to supercutical fluid on-batch production processing on polymer granules.

The invention discloses a pistol-type circumcision anastomat with a safety catch; the circumcision anastomat comprises a glans penis base, a regulating rod, a regulating handle, a cylindrical knife, a suturing nail ejecting drum, a hollow ejector rod, a nail cartridge ring and suturing nails arranged inside the nail cartridge ring, wherein the cylindrical knife is sleeved inside the suturing nail ejecting drum in a mode of mounting coaxially; the circumcision anastomat further comprises a pistol body and a trigger transmission mechanism; the pistol body is composed of a tubular body part, a main shell part and a handle part; the trigger transmission mechanism is composed of a trigger, a transmission piece, a transmission arm, a swing arm, a sliding block and a reset spring; the safety catch is arranged on the trigger; and the safety catch comprises a hinge shaft, a supporting rod, a button, a sliding block, a reset spring and a guide groove. The circumcision anastomat disclosed by the invention, by adding the safety catch and by designing the safety catch, is safer and more convenient in operation, and the circumcision anastomat fully manifests the design concept of being user-friendly.

There is provided a novel method for producing a bifunctional epoxy monomer which comprises reacting diolefin with a hydrogen peroxide aqueous solution, in the presence of molybdenum or tungsten oxide as a catalyst to selectively epoxidize a double bound at a specific position. The bifunctional epoxy monomers provided by the present invention are substances widely used in various industrial fields such as chemical industry, as materials for resist materials (particularly solder resist materials), and intermediates of agrochemicals and medicines, and various polymers such as plasticizers, adhesives and coating resins.

The invention discloses a method for measuring temperature of a welding wire for laser hot wire welding. The method comprises the following steps: sending the welding wire to a base metal prewelding position at a preset wire feeding speed; heating the welding wire with preset heating current so as to enable the welding wire to generate resistance heat to enable the temperature to be increased; heating a target welding area by pulse laser with preset laser power, wherein the tail end of the welding wire is away from the center of a laser spot in a fixed distance and is heated; measuring the temperature of the welding wire within a light stop gap of the pulse laser. The method for measuring temperature of the welding wire for laser hot wire welding has the advantages of accuracy and reliability.

The invention discloses a nozzle position adjusting device and method based on a plant protection unmanned aerial vehicle flight direction; the nozzle position adjusting device comprises a pesticide box, a spraying mechanism, an executing device and a control system, wherein the executing device is used for driving the spraying mechanism to move so as to ensure that the spraying mechanism is located behind the plant protection unmanned aerial vehicle all the time when the plant protection unmanned aerial vehicle works and flies, and the spraying mechanism comprises a spraying rod and a nozzle;the executing device comprises a supporting rod, a first rotating mechanism and a second rotating mechanism; the control system comprises a flight state acquisition module and a calculation processing module. The nozzle position adjusting device is simple in structure and simple, convenient and safe to operate, and can reduce the influence of a turbulent wind field below rotor wings on the drifting of fog drops, so that the drifting of the fog drops is reduced, the efficiency and the prevention and control effect of the spraying operation of the plant protection unmanned aerial vehicle are ensured, and the application prospect of the nozzle position adjusting device is relatively large.

The invention belongs to the technical field of pepper harvesting tools and particularly relates to a pepper picking machine with adjustable operation height and angle. The pepper picking machine withadjustable operation height and angle comprises a battery, a power cord, a handle, a controller, a motor, a speed reduction mechanism, a telescopic rod, a drive shaft, a damping bolt, an angle adjustment lever, a power conversion mechanism, a reciprocating cutter and a switch button, wherein the battery is connected with the controller through the power cord; the controller is connected with themotor and embedded in the handle; the switch button is disposed on the handle and connected with the controller; the speed reduction mechanism is respectively connected with the motor and the drive shaft; the telescopic rod is connected to the handle; the angle adjustment lever is connected with the telescopic rod through the damping bolt; the power conversion mechanism is respectively connected with the drive shaft and the reciprocating cutter. The pepper picking machine with the adjustable operation height and angle has the advantages of making picking safe and labor-saving and increasing continuous operation time through conversion of high and low level picking models during the picking process of the pepper, achieving a wide range of precise picking by adjusting operation height and angle, being compact in overall structure, and being high in picking efficiency.

An inverted machine has a supporting bracket, an orientating assembly, a connecting frame and a table. The supporting bracket has two supporting shafts, two mounting jackets and a locating sheath mounted around one of the mounting jackets. The orientating assembly is connected to the supporting bracket and has a brake locator, a rotating shaft, two clamping slices, a pulling rod, a spring and a cam device. The brake locator is connected to the mounting jacket that is connected to the locating sheath. The rotating shaft is connected to the other mounting jacket. The clamping slices are pivotally connected to the brake locator. The pulling rod is connected to the clamping slices. The spring is mounted around the pulling rod between the clamping slices. The cam device is connected to the pulling rod. The connecting frame is connected to the orientating assembly. The table is mounted on the connecting frame.

The invention discloses a low-temperature-resistant, oil-resistant, torsion-resistant and high-flame-retardant sheath material and a preparation method thereof. The low-temperature-resistant, oil-resistant, torsion-resistant and high-flame-retardant sheath material comprises the following components in parts by mass: 60 to 80 parts of chlorinated polyethylene, 20 to 40 parts of chlorosulfonated polyethylene, 0-10 parts of an ethylene-vinyl acetate copolymer, 60-100 parts of talcum powder, 20-40 parts of calcium carbonate, 20-40 parts of magnesium hydroxide, 0-10 parts of a flame retardant, 20parts of carbon black, 6 parts of magnesium oxide, 5 parts of red lead, 10-25 parts of a plasticizer, 10 parts of chlorinated paraffin oil, 1.5 parts of an antioxidant, 5 parts of a cross-linking agent and 4 parts of dicumyl peroxide. By adding the components and proportioning the components according to a specific ratio, the sheath material is ensured to have favorable mechanical properties and processability while prolonged in service life and enhanced in low-temperature resistance, oil resistance, torsion resistance and flame retardancy.

The invention relates to a material conveying device, in particular to a tubular bag type fluidized bed device for a bulk powder material tank truck, which overcomes the shortcomings of the conventional large-chute type fluidized bed device. The tubular bag type fluidized bed device comprises a chute type fluidized bed consisting of tilting fluidized bed surfaces, wherein a master air chamber is arranged below the tilting fluidized bed surfaces; each tilting fluidized bed surface comprises a fluidized bed plane, a fluidized bed slope and a lateral bevel board which are laid by fluidized bed components; the fluidized bed component comprises a hollow tube bag type air chamber which is formed by connecting an air permeation layer and an enclosed later and provided with a corrugated lining plate; and one end of the hollow tube bag type air chamber of each fluidized bed component is provided with a blast pipe communicated with the master air chamber and the other end of the hollow tube bag type air chamber is sealed by a trim strip. The fluidized bed device fully utilizes the tank space, reduces the center of gravity for car loaded, increases the load, reduces the tank capacity, increases the effective load volume; increases the fluidization area, facilitates the fluidization of the bulk materials, increases the unloading speed, and has the characteristics of convenience and safety of operation, good working condition and the like.

The invention discloses an electric energy device used for adjusting hybrid power of an intermediate voltage power system, and relates to the technical field of power electronics. Three phase cascading units are in star connection; each phase cascading unit is composed of n full-bridge inversion units, n large capacitor banks, n automatic switches and n battery pack units, the n full-bridge inversion units are connected in series, the head end of the first full-bridge inversion unit of each cascading unit is connected with a corresponding electric reactor, and the tail end of the nth full-bridge inversion unit of each cascading unit is connected with the tail ends of the nth full-bridge inversion units of other two cascading units; intermediate voltage grid connection is achieved due to the fact that the multiple single-phase full-bridge inversion units are cascaded, reactive power and transient-variation active power are adjusted through large capacitors on a direct-current bus of each unit, and slow-variation active power is adjusted through the battery pack units on the direct-current bus of each unit; besides, a grid connection transformer is not needed, little floor space is occupied, and the device is easy to maintain.

The invention relates to the technical field of medical processes, in particular to a method for preparing high-purity tolperisone hydrochloride. According to the method disclosed by the invention, the addition amounts of methylbenzene, anhydrous aluminum trichloride and propionyl chloride, a reaction temperature and reaction time in a Friedel-Crafts acylation reaction are strictly controlled; andafter a Mannich reaction is finished, cooling to 20-30 DEG C is performed, and isopropanol and isopropyl ether are added are added for heat-preserved crystallization for 2 hours or longer; and the solid-liquid separation is conducted to obtain a crude tolperisone hydrochloride product. The method for preparing the high-purity tolperisone hydrochloride can reduce Friedel-Crafts acylation side reactions, improve product purity and product yield, is environmentally friendly, and is easy, convenient and safe to operate.

The invention relates to comprehensive development and utilization of a machine design, physical metallurgy and a casting furnace and belongs to casting system engineering. Aiming to reduce the unnecessary loss and improve the product quality of casting enterprises, the invention designs a novel durable casting furnace. A dynamic physicochemical numerical value of a whole process is finished by the control of a computer and the requirements of a product design are met. A cylindrical grid type finance liner framework is designed on the structure of a furnace body; temperature-resisting materials including high-smelting-point 2*20 circular iron, gold powder, quartz, sand and the like are poured on the finance liner framework to form a high-quality furnace liner; an electric furnace grate is in a coil shape and heats uniformly so as to conveniently raise and control a furnace temperature. Tapping liquid of the casting furnace is driven by a speed reducer and is finished by a linkage mechanism, so as to realize automatic control and safety. The quality of molten iron in the casting furnace is required to be detected for three times in each hour to detect various physicochemical indexes until the yield of the molten iron is up to more than 98%.

The coupling current is applied to the grounding wire of a circuit breaker bus side test phase line, and the induction current is detected from the grounding wire of a circuit breaker load side test phase line, so that whether the grounding wire of the circuit breaker bus side test phase line and the grounding wire of the circuit breaker load side test phase line form a loop or not is judged; therefore, the opening and closing action time of the high-voltage circuit breaker can be deduced, and the opening and closing time of the high-voltage circuit breaker in a high-voltage line can be tested. According to the invention, the opening and closing test is carried out on the high-voltage circuit breaker through the coupling current and the induction current, the high-voltage circuit breaker does not need to be separated from the high-voltage line, the opening and closing time test of the high-voltage circuit breaker in the high-voltage line is realized, and the test safety is ensured.

Disclosed is a process for preparing aqueous phase layer-by-layer assembly of core-shell quantum dots of CdTe/CdSe with near-infrared fluorescence. At first, cadmium chloride, mercapto-compound and sodium hydrogen telluride (potassium) are synthesized to be CdTe nanocrystalline core, aqueous solution of cadmium-mercapto compound and fresh solution of sodium hydrogen selenide (potassium) are sequentially added in the CdTe nanocrystalline core, and then reflow to form one layer of the CdSe. By repeating the operation of synthesizing the shell layer, quantum dots of different shell layer number and of emission wavelength within 650 to 800 nanometers are produced. The process of the invention has the advantages of simple operation, mild conditions and low cost, and the quantum dots of CdTe/ CdSe of the synthesized product are perfect in water-solubility and stability and relatively high in yielding fluorescent quantum, and the emission spectrum is adjustable within near-infrared region.

The invention provides a preparation method of cetomacrogol 1000, characterized by comprising the steps of (1) dissolving polyethylene glycol a dry organic solvent, adding metallic sodium under stirring and nitrogen protection, and heating to allow refluxing reaction; (2) cooling, dropwise adding bromohexadecane, and heating to allow refluxing reaction to obtain cetomacrogol 1000. The method allows cetomacrogol to be prepared only under the normal pressure by heating and refluxing; the method has no need for high pressure equipment, is simple and safe to perform, and prevents the defects thatethylene oxide is flammable and explosible and carcinogenic and requires strict transport conditions; the method has the advantages that the materials are simple and easy to attain, the process is simple and good in safety, equipment input cost is low, no geographic restrictions occur, and the method is applicable to large-range large-scale production.

The invention relates to a mutual inductor mold, in particular to a glass fiber reinforced plastic mutual inductor mold and a manufacturing method thereof. The glass fiber reinforced plastic mutual inductor mold comprises a bottom plate, a left mold and a right mold, wherein the left mold and the right mold are arranged on the bottom plate and are fixedly connected; the left mold and the right mold are both made of glass fiber reinforced plastics. Inserts are correspondingly arranged on the connecting end faces of the left mold and the right mold, and every two corresponding inserts are connected through a connecting bolt. By utilizing the characteristics of the glass fiber reinforced plastic material, the glass fiber reinforced plastic composite material has the advantages of light weight, hardness, stable performance and high mechanical strength, and can relieve great burdens for enterprises in the aspects of manufacturing process, manufacturing cost, processing period and the like.

The invention discloses a preparation method of 5-bromo-2-chlorobenzoic acid, and belongs to the field of medicine synthesis. The preparation method comprises the following steps: (1) carrying out esterification reaction on 2-nitrobenzoic acid and alcohol to obtain a first intermediate; (2) carrying out reduction reaction on the first intermediate and a first reducing agent to obtain a second intermediate; (3) carrying out a halogenation reaction on the second intermediate and a first halogenation reagent, adding a second reducing agent into the reaction system after the halogenation reaction is completed, carrying out a reduction reaction, and then carrying out a hydrolysis reaction with alkali to obtain 5-bromo-2-aminobenzoic acid; and (4) carrying out diazotization reaction on the 5-bromo-2-aminobenzoic acid and a diazotization reagent, and then carrying out halogenation reaction on the 5-bromo-2-aminobenzoic acid and a second halogenation reagent to obtain the 5-bromo-2-chlorobenzoic acid. The preparation method has the advantages of mild reaction conditions, safe and simple operation, short production period, cheap and easily available raw materials and solvents, no explosive or highly toxic products, and facilitation of environmental protection; and the prepared product has high yield and purity, and is beneficial to industrial production.

The invention discloses a loading and unloading device for a load test of a large structural member. A graded loading and unloading mechanism is mounted at a loading end; when a certain loading pointis loaded or unloaded, the jack only needs to be installed between the distributive girder of the loading point and the large structural member, a gap is formed between the distributive girder and thelarge structural member through extension of the jack, and accurate loading or unloading is achieved by controlling the total thickness of the inserted or taken-out base plate. Correspondingly, the invention further discloses a loading and unloading method for the load test of the large structural member. The loading and unloading device is adopted, the loading step and the unloading step are carried out in multiple rounds, graded loading and graded unloading are achieved, when loading or unloading is carried out on a certain loading point, due to the fact that the single-time force application is small, too large loads cannot be added to the adjacent pull rods, the safety of the pull rods can be guaranteed, anchor retreating and unloading operation is easy and convenient, and the workingefficiency is greatly improved.