118results about How to "Reduce potential hazards" patented technology

In an underground exploitation process of a coal mine, the coal recovery rate needs improving, and a roller bit of a coal mining machine is prevented from cutting roof strata as far as possible so as not to damage equipment or even cause accidents, so an interface of a coal layer and a rock layer needs on-line identification. The invention provides a coal-rock interface identification method, a coal-rock interface identification system and a coal-rock interface identification probe. A specific energy-level high-pressure water jet which can penetrate the coal layer but cannot penetrate the rock layer is jetted to the coal layer above a tunnel, different acting forces of reflected flow reflected by the coal layer or the rock layer on a nozzle are sensed in real time, and a controller judges the distance between the upper end of the roller bit of the coal mining machine and the coal-rock interface to realize automatic heightening control of a rocker arm of the coal mining machine so that the coal exploitation process realizes the goals of high recovery rate, low mechanical abrasion rate, automatic operation and the like. The coal-rock interface identification method, the coal-rock interface identification system and the coal-rock interface identification probe provided by the invention have the advantages of low cost, high adaptability, high reliability, intrinsic safety and the like.

The invention discloses an anaerobic digestion device and process for pre-treating sludge with high solid content by a heating method. The anaerobic digestion process comprises the following steps of: forming sludge with solid content of 10% in a sludge mixing unit; pumping the sludge to a heating tube of a heating tank by a peristaltic pump; heating and pre-heating the sludge for 30-60 minutes at the temperature of 70 DEG C; and adding the pre-treated sludge to an anaerobic digestion tank for carrying out stirring anaerobic digestion. According to the anaerobic digestion device and process provided by the invention, the problems that the sludge anaerobic digestion has larger traffic volume, the cost is high, and the sludge is difficult to hydrolyze and acidize are solved; and the reduction, reclamation and innoxious disposal of the sludge are realized.

The invention provides a device and method for testing density, concentration and thickness based on X-ray. It adopts a tester for density, concentration and thickness based on X-ray to measure the sample with known measured density, concentration and thickness. The relational expression between signal intensity ratio of the reference counter tube and the working counter tube and the density or concentration of the substance to the measured is calculated by least square method. When the density or concentration of the unknown substance is measured, the invention follows the relational expression with the signal intensity ratio of the reference counter tube and the working counter tube together. The invention is placed in two sides of the detected object, which is compactly structured, convenient to use, and capable of realizing on-line measurement; meanwhile, it is able to reach multiple purpose by one device with wide application range. The method of the invention is better than the method used by other apparatuses and devices for measuring density, concentration and thickness.

The invention discloses a vehicle networking safety early warning system comprising a vehicle-mounted microcomputer controller which is installed on a vehicle. The vehicle-mounted microcomputer controller comprises a master control unit which is electrically connected with a GPS positioning unit, a velocity measurement sensor, a direction sensor, an acceleration sensor, a wireless broadcast module and a display unit. The master control unit is used for generating movement state information of a current vehicle through the position data, the driving velocity data, the driving direction data and the acceleration data of the current vehicle and transmitting the movement state information of the current vehicle by utilizing the wireless broadcast module so that the movement state information of the current vehicle can be acquired by the vehicle-mounted microcomputer controllers of other vehicles. The master control unit also receives the movement state information of other vehicles transmitted by the vehicle-mounted microcomputer controllers of other vehicles by utilizing the wireless broadcast module and displays the movement state of other vehicles through the display unit for viewing of a driver. Safety and convenience in the traveling process can be effectively enhanced.

The invention discloses an intelligent numerical control lathe convenient for use. The intelligent numerical control lathe convenient for use comprises a danger warning device, a safety protection shell, a distribution box, a shrinkage type safety support base and a waste storage box, wherein the danger warning device is mounted at the left end of the upper surface of the safety protection shell; the distribution box is mounted below a motor transmission; the waste storage box is mounted at the bottom end in the safety protection shell; and the shrinkage type safety support base is mounted at the bottom of the safety protection shell. As the distribution box is additionally mounted below the motor transmission, and an accumulator and a transformer are arranged in the distribution box, when the lathe works under normal conditions, the accumulator can be charged, and when power suddenly fails, the accumulator can still supply electric quantity, the sudden stop of the lathe is thoroughly prevented, the potential hazards suffered by operators are effectively reduced, the normal working performances of parts in the lathe are protected, the lathe is protected from being damaged, and the service life of the lathe is effectively prolonged.

The invention discloses a novel micropterus salmoides mixed feed and a preparation method thereof. The feed is composed of the following components in percentage by weight: 8 to 12% of fly maggot protein powder, 3 to 5% of chicken meat, 5 to 10% of peeled soybean meal, 3 to 6% of molasses yeast, 17 to 23% of high protein flour, 10 to 20% of peanut cake, 10 to 20% of rapeseed meal, 20 to 25% of fish meal, 1 to 2% of calcium dihydrogen phosphate, 3 to 5% of soybean phosphatide oil, 1% of vitamin premix, and 1% of mineral substance premix. The provided feed does contain any cuttlefish paste, and thus the dependence on cuttlefish paste is eliminated. Furthermore, the using amount of fish meal is reduced. The provided feed is efficient, environment-friendly, and sustainable; the cost is greatly reduced, and at the same time, the feed has the advantages of comprehensive nutrients, good palatability, capability of promoting growth, and low food coefficient, and is capable of maximally promoting the growth of micropterus salmoides, reducing the culture cost, and improving the economic benefit.

The invention relates to the use of granules produced from pyrogenically prepared silicon dioxides as carriers for substances chosen from the group consisting of foodstuffs additives, such as dyestuffs, antioxidants, preservatives, emulsifiers, gelling agents, thickeners and binders, stabilizers, alkalis, acids, salts, antilumping agents, flavour intensifiers, sweeteners, aromas, feedstuffs additives, chemical intermediates and plant protection agents.

A device (10) for introducing air and / or sealant into a tire, in particular motor vehicle tires, comprises a reservoir (14) for the sealant, in particular a bottle, a pressure generating means (19) connected or able to be connected to the reservoir, in particular an electric pump or a compressor, said means provided for emptying the reservoir, optionally an electric connection cable for the pressure generating means, with a connection element at the end thereof, in particular a plug, for connecting the connection cable (56) to a power supply, in particular to the cigarette lighter of a motor vehicle, a hose (30) for the air and / or the sealant, said hose connected to or able to be connected to the reservoir, the other end of said hose being able to be connected to the tire to be filled, and a housing (12) for receiving at least a portion of the device components. The container is disposed in a lying position in the position of use of the device.

An LED lamp has dual modes of operation from fluorescent lamp fixtures. A first circuit powers at least one LED in a first mode of operation when first and second power connector pins at a first end of the lamp are inserted into power receptacles of the fixture that are directly connected to power mains. A second circuit powers at least one LED in a second mode of operation when the second power connector pin at the first end of the lamp and a third power connector pin at a second end of the lamp are inserted into power receptacles of a fixture powered from an electronic ballast. First and second conduction control means permit the second circuit to power at least one LED during the second mode of operation.

The invention discloses a high-flame-retardance composite polyether used in fishing vessels. The invention belongs to the technical field of polyurethane foam plastics. The composite polyether comprises the components of: 25-80 parts of halogen-free flame-retardant polyether, 0-50 parts of halogen-free flame-retardant polyester, 15-20 parts of structural polyether, 5-10 parts of cross-linked polyether, 1-2 parts of a foam stabilizer, 12 -18 parts of a catalyst, 0.4-1.8 parts of deionized water, 28-40 parts of chlorodifluoroethane, 22-52 parts of a halogen-free flame retardant, and 200-280 parts of diphenylmethane diisocyanate. A total amount of the halogen-free flame-retardant polyether, the halogen-free flame-retardant polyester, the structural polyether, and the cross-linked polyether accounts for 100 parts. The fishing vessel high-flame-retardance composite polyether has the advantages of high flame-retardance coefficient, good insulation effect, high dimensional stability, no toxic effect, and the like. The high-flame-retardance composite polyether can be applied in industries such as vessels and construction.

The invention relates to a mobile refrigerated vehicle (2) comprising a refrigerated chamber housing (3) for at least one refrigerated chamber (4) contained therein, a tank (5) for liquefied gas, an evaporator (1) for the evaporation of the liquefied gas during the delivery of cold to the refrigerated chamber (4) and an exhaust pipe (6) for the evaporated gas, in conjunction with which the evaporator (1) is arranged outside the refrigerated chamber (4); and a method for ref rigerating a refrigerated chamber (4) of a mobile refrigerated vehicle (2). The invention is characterized in that dependable and efficient refrigeration of products can be achieved in conjunction with particularly high operational reliability and energy-saving.

An automatic water level adjusting drainage anti-slide pile comprises a pile body. Concrete is poured into a steel reinforcement cage to form the pile body, the pile body comprises a concrete pile body and a rectangular hollow pile body arranged on the concrete pile body, an outer steel formwork encloses the outer side of the pile body, an inner steel formwork encloses the rectangular hollow pile body, a plurality of water inlet pipe groups are longitudinally and parallelly arranged on the upper portion of one side of a tension end of the rectangular hollow pile body, a plurality of adjusting water inlet pipe groups are longitudinally and parallelly arranged on the lower portion of one side of the tension end of the rectangular hollow pile body, a plurality of water outlet pipe groups are longitudinally and parallelly arranged on one side of the tension end of the rectangular hollow pile body, and the rectangular hollow pile body is provided with a punching device. The automatic water level adjusting drainage anti-slide pile and a construction method thereof can solve the problems that water level cannot be automatically adjusted, operations are difficult and manufacturing cost is high, rainfall can be realized in a peak shifting manner, the pressure of flowing water in slope soil is decreased, potential risks of landslide damage are reduced, and automation of drainage and water level adjustment is realized.

The invention relates to a medicinal extract of honeysuckle and scutellaria root, and the quality control method for preparations containing honeysuckle extract and scutellaria root extract, which comprises employing high temperature liquid chromatography to establish a series of fingerprint patterns of honeysuckle flower, honeysuckle flower extract, baikal skullcap root herbs and extract, and preparations containing honeysuckle extract and scutellaria root extract from raw material to final preparations, then investigating the correlation between the patterns.

The invention discloses a tunnel roof two-dimensional seismic exploration method and a tunnel roof two-dimensional seismic exploration system. The method comprises the following steps of: seismic data acquisition: arranging multi-coverage observation systems on a tunnel roof and the sides, and acquiring seismic data of the multi-coverage observation systems; sending a seismic wave signal from a seismic focus, and receiving the seismic wave signal by the multi-coverage observation systems; seismic data processing: receiving the seismic wave signal by the multi-coverage observation systems, performing tunnel correction processing, data pre-processing, migration stack processing and time frequency analysis processing, and thus obtaining an effective tunnel roof rock coal seam seismic profile and a frequency spectrum profile; acquiring an effective two-dimensional seismic profile of the tunnel roof in a range of 15 m to 50 m; and geologic structure analysis and explanation: analyzing and explaining the tunnel roof upper coal seam occurrence and geologic structure conditions. By adoption of the tunnel roof two-dimensional seismic exploration method provided by the invention, judgment capacity on a small structure can be improved, accurate and reliable geological data are provided for coal mining operation, and the safety of mining operation is improved.

The invention relates to an extracting method for ursolic acid and an application. The extracting method comprises the following steps: S1, taking songaria cynomorium herb and mixing with ethyl alcohol and a deep-eutectic solvent, ultrasonic-extracting, centrifuging, to obtain ursolic acid crude extract liquid; S2, enabling the ursolic acid crude extract liquid to be mixed with inorganic salt, toobtain mixed liquid, and adjusting a temperature and a pH value of the mixed liquid, to obtain the ursolic acid. The method is capable of using a salting out extraction system in a more moderate usingcondition, and reducing a potential risk of organic solvent extraction. In addition, the method is capable of further using the environment-friendly deep-eutectic solvent as an additive, and improving extraction efficiency of a product.

A preparation method of a modified clay mineral material for purification of fluorine-containing sewage comprises steps as follows: a clay mineral is added to a sodium hydrogen sulfate solution and stirred at the room temperature for 1-3 h; the mixture is placed in a muffle furnace to be calcined at the temperature of 300-500 DEG C for 1.5-3 h; calcined solids are added to water, the pH value is adjusted to range from 8 to 9 by the aid of a strong base solution, and the mixture is placed into the muffle furnace after centrifugation, heated to the temperature of 200-500 DEG C and calcined for 3 h; the modified clay mineral material having the capability of purifying the high-fluorine-ion sewage is obtained. According to the method, alumina in the clay mineral is corroded by the aid of a strong acid and weak base salt solution, separated from the structure of the clay mineral and loaded on an amorphous silica surface to serve as an absorption activity center; the modified clay mineral material is obtained through base treatment and calcining activation. The modified clay mineral material prepared with the method has good adsorption capability for F<-> in the sewage, and the removal rate can be higher than 95.3%. According to the method, the technology is simple, the preparation period is short, the energy consumption is low, the pollution is low, the cost is low, and industrial production is easy.

The invention discloses a hydrogen peroxide disinfectant. Thehydrogen peroxide disinfectantis composed of the following components in percentage by weight: 0.3-0.6% of hydrogen peroxide, 0.01%-0.05% of zinc ions / copper ions, 0.05-0.50% of citric acid, 0.4-1.5% of a penetrating agent, 0.1-1.0% of a surfactant and 0.04-0.1% of a stabilizing agent, with the balance being purified water. The inventionalso discloses a preparation method of the hydrogen peroxide disinfectant. The hydrogen peroxide disinfectant disclosed by the invention can be used for rapidly killing mycobacteria, and has good stability, catalyst resistance and strong anti-interference capability.

The invention provides a production and manufacturing traceability system and platform. The production and manufacturing traceability system comprises an Internet of Things monitoring subsystem, a visual traceability subsystem and a production management subsystem. The Internet of Things monitoring subsystem is used for collecting data and information of all production links in the product production process, and the obtained data is uploaded to the visual traceability subsystem to be analyzed and applied. The visual traceability subsystem is used for searching and displaying link informationof the production process of a certain batch of products and basic data information of the batch of products; the production management subsystem is used for managing equipment, materials, plans, personnel and products related to product production; if an emergency problem exists, problem correction and responsibility investigation can be carried out in time; the cloud computing storage system iseasy to deploy, existing traceability resources are fully utilized, the high efficiency of cloud computing is utilized, the accuracy and timeliness of commodity traceability can be improved, the problem that enterprises cannot accurately collect traceability information in time is solved, and meanwhile product whole-course traceability is achieved.

The invention discloses a fixed-time automatic power off device, relating to a control circuit. The fixed-time automatic power off device comprises an intermediate relay, a time relay, a linked switch and a connection switch, wherein a negative electrode at a power input end is connected with a negative electrode at a power output end, a positive electrode at the power input end is in series connection with a first normally-open contact of the time relay and a normally-closed contact of the linked switch and then is connected with a positive electrode at the power output end; the first normally-open contact of the time relay, the normally-closed contact of the linked switch and a normally-open contact of the linked switch are connected in parallel; a first normally-open contact of the time relay KT is connected with the connection switch in parallel; the positive electrode at the power input end is in series connection with the connection switch, then is in series connection with the first normally-closed contact, and then is connected with the negative electrode at the power output end; and the positive electrode at the power input end is in series connection with a second normally-open contact of the intermediate relay and the time relay and is then connected with the negative electrode at the power output end. According to the invention, energy wastes can be reduced effectively, and potential hazards of using electric appliances under an unmanned environment are reduced.

The invention discloses a head protection device for firefighting and a firefighting command system. The head protection device comprises a fireproof heat-insulation face shield, a thermal imager, anaugmented reality display module, a power source module, a master control module and a wireless communication module. The fireproof heat-insulation face shield comprises a transparent viewing region.The thermal imager is connected with the master control module. The augmented reality display module is arranged on the inner side of the fireproof heat-insulation face shield and connected with the master control module. The wireless communication module is connected with the master control module and used for sending infrared images acquired by the thermal imager to a firefighting command facility. The master control module is used for controlling the infrared images acquired by the thermal imager to be subjected to augmented reality display operation on the augmented reality display module.By the adoption of the head protection device for firefighting and the firefighting command system, the firefighting work of a firefighter can be conveniently carried out, the fire scene viewing field of the firefighter can be broadened, the potential hazard on the fire scene can be easily discovered, and therefore the guarantee of the life safety of the firefighter is improved, and the video image data basis is provided for the fire scene disaster relief work in the future.

The invention provides a coupling locking device. The coupling locking device comprises a coupling and a shaft, and is characterized in that a big counter bore is formed in the upper portion of a shaft hole of the coupling; a small counter bore is formed in the bottom face of the big counter bore; a small taper sleeve is placed in the small counter bore; the two edges of the outer side of the cross section of the small taper sleeve are right-angle sides, a bevel is located inside, a base is located on the bottom face of the small counter bore, and a right-angle side edge is located on the side face of the small counter bore; a big taper sleeve is placed in the big counter bore; the bottom of the big taper sleeve is provided with a downward convex taper sleeve, the two edges of the inner side of the cross section of the taper sleeve are right-angle sides, and an outer side edge is a bevel; the bevel of the downward convex taper sleeve of the big taper sleeve is attached to the bevel of the small taper sleeve; the outer side of the bottom of the big taper sleeve is provided with a threaded hole; the bottom face of the big counter bore is provided with a corresponding threaded hole; and a stud is screwed into the two threaded holes. The coupling locking device has the advantages that torque is transmitted without a key, so that a key groove does not need to be milled in the shaft; and accordingly, the strength of the shaft is improved, and the disassembling and assembling of the coupling are facilitated.

The invention discloses a preparation method of a nascent state in-situ modified reverse osmosis membrane. The method includes: 1) adding poly-acyl chloride to an alkane solvent with stirring to forma homogeneous and colorless organic phase, and sealing and standing the organic phase; 2) dissolving polyamine to form a water phase solution and regulating pH of the solution to 10; 3) pouring the polyamine water phase solution on a porous support membrane, allowing the solution to stand, and pouring away residual water phase solution, draining the membrane until no naked-eye-visible water spot exists on the membrane; 4) pouring the solution into the poly-acyl chloride organic phase solution to obtain a nascent membrane, and pouring the membrane into poly-acyl chloride organic phase solutions, in different concentrations, for modification reaction; 5) drying the modified nascent state reverse osmosis membrane to shape the membrane. Through regulation on the crosslinking degree of the surface of the nascent state reverse osmosis membrane, defects in the membrane are reduced, surface charge of the nascent membrane is controlled, and selective permeability of the reverse osmosis membraneis effectively enhanced.

The invention provides a high-light-effect and ultra-high-color-development high-voltage alternating-current warm white LED (light emitting diode) and an acquisition method thereof. The LED comprises a substrate, tandem high-voltage LED bodies, a fluorescent cover and an alternating-current driving control circuit, wherein the number of the tandem high-voltage LED bodies is preset; the tandem high-voltage LED bodies are fixed on the substrate; each high-voltage LED body comprises a high-voltage red-light chip, a high-voltage blue-light chip and a green emitting phosphor packaging layer for packaging the high-voltage red-light chip and the high-voltage blue-light chip; the fluorescent cover is provided with a yellow emitting phosphor coating; space for accommodating the high-voltage LED bodies is formed by matching the fluorescent cover and the substrate; the alternating-current driving control circuit comprises a bridge rectifier circuit and two current adjustable modules; the current provided by an alternating-current power supply is divided into two channels of current by using the bridge rectifier circuit; the two channels of current are respectively supplied to the two current adjustable modules and serve as drivers of a blue-light group and a red-light group. The high-light-effect and ultra-high-color-development high-voltage alternating-current warm white LED is high in light effect, light rays are uniform, and light emergent directions are consistent.

The invention discloses a novel compound feed for fish-shrimp mixed culture. The novel compound feed is prepared from the following components in mass percent: 5%-8% of housefly protein, 3%-5% of chicken meal, 5%-10% of peeled soybean meal, 5%-10% of molasses yeast, 20%-25% of high gluten flour, 20%-30% of DDGS (distillers dried grains with soluble), 20%-25% of rapeseed meal, 1%-2% of monocalcium phosphate, 3%-5% of soyabean phosphatide oil, 1% of vitamin premix, and 1% of mineral substance premix. According to the feed formula, the dependence on fish meal and cuttlefish paste is eliminated, the novel compound feed has the characteristics of high efficiency, environment protection and sustainable development, and the feed cost can be reduced greatly; and the compound feed has comprehensive nutrition and strong feeding attraction property, is high in palatability, can promote growth, has low feed coefficient and can release the growth potential of shrimps to the maximum extent, the breeding cost is reduced and the economic returns are improved.

The invention belongs to the field of high-molecular polymers, and particularly relates to a method for preparing a high-molecular polymer through anionic polymerization of alkyl acrylate polar monomers and application of the high-molecular polymer. In a system in which tetrahydrofuran is not used as a solvent or a main component of the solvent, the polymerization reaction temperature is close toor higher than 0 DEG C, under the assistance of a cap monomer, a certain amount of tetrahydrofuran is introduced to play a role in inhibiting carbonyl side reaction of alkyl acrylate polar monomers, and the molecular weight of the obtained product is in unimodal distribution. The side reaction inhibitor used in the method is easier to obtain, lower in cost, simpler and more convenient to operate and lower in risk. The product prepared by the method provided by the invention is used as a plastic and / or rubber blending modification compatibilizer, and the obtained blend (polymer alloy) has improved mechanical properties.

The invention relates to a safe syringe which comprises a needle and a transparent contractile needle sleeve, wherein the needle comprises a needle tip, a needle rod and a needle bolt; the needle sleeve is sleeved on the need tip; one end of the needle sleeve is connected with the needle bolt, and the other end of the needle sleeve is open; and length of the needle sleeve meets the condition that the needle tip is sleeve in the needle sleeve. As for patients, since hands of a medical staff can not be in direct contact with the needle before injection through the protection of the needle sleeve, and the pollution to the needle is prevented. As for the medical staff, the medical staff can not be stabbed before injection through the protection of the needle sleeve; besides, because the needle sleeve is the contractile sleeve, the needle sleeve can be automatically restored to the original state after injection, and the needle is protected, thereby greatly reducing the stabbed probability of the medical staff.

The invention belongs to the technical field of acrylic fiber processing and mainly relates to an unstable island type PA6 / PU (Polyamide / (Poly Urethane) suede superfine fiber synthetic leather pad-dyeing process by using a vat dye. The unstable island type PA6 / PU suede superfine fiber synthetic leather pad-dyeing process by using the vat dye provided by the invention is capable of obtaining the unstable island type PA6 / PU suede superfine fiber synthetic leather through pad dyeing through the following steps: preparing a dyeing liquor by compounding the vat dye with an anionic migration inhibitor, compounding a reducing liquid from sodium hydrosulphite and caustic soda, and taking hydrogen peroxide as an oxidating liquid, and then carrying out the process flow of padding in the dyeing liquid, infrared predrying, drying, baking, padding in the reducing liquid, steaming, water washing, oxidizing for 2-4 times, twice soap-boiling, twice water washing and drying. The unstable island type PA6 / PU suede superfine fiber synthetic leather obtained through the pad-dyeing process provided by the invention has excellent color fastness to light, excellent color fastness to washing, excellent crockfastness and excellent chlorine bleaching resistance.

The invention discloses an auxiliary traction device for orthopedics. The auxiliary traction device for orthopedics structurally comprises a control box, an operation panel, an operation table, a mattress, a fixing belt, a right armpit rest, a sponge sleeve, a left armpit rest, a head rest, an telescopic rack, a front controller, a controller connection line, universal wheels, a bed body, a rear controller, a fuse, a power socket, an armpit rest adjustment mechanism, a transmission mechanism, and a storage battery, wherein the operation panel is arranged on the operation table, the control boxis arranged in the operation table, the control box is electrically connected with the operation panel, the mattress is arranged on the bed body, and the storage battery is electrically connected with the control box. The auxiliary traction device for orthopedics adopts a motor-driven method to assist traction, and an emergency stop mechanism is arranged between the motor and the storage battery;when a patient feels that the traction is too large, the emergency stop mechanism can operate to effectively reduce the potential danger and to protect the patient from secondary injury.

The invention discloses a high-altitude anti-falling-object protection system which is applied to a high-floor balcony and comprises a plurality of floor positioning modules, a plurality of floor processing modules, a plurality of floor protection modules and a master control module. Each floor is provided with one floor processing module, one floor positioning module which is used for acquiring coordinate information of a falling object and transmitting the coordinate information of the falling object to the floor processing module, and one floor protection module which is controlled by the floor processing module to work; the plurality of floor processing modules transmit the coordinate information of the falling object obtained by the floor processing modules to the master control module again, the master control module processes and predicts the motion trail of the falling object, and the master control module controls the floor protection modules to work according to the predicted motion trail of the falling object. The protective net can be unfolded in time when a high-altitude falling object is monitored, and the effect of preventing the falling object from falling is achieved.