38results about How to "Avoider damage" patented technology

The invention specifically discloses an aluminum silicate fiber refractory felt with good heat insulation performance, belonging to the technical field of refractory materials. The aluminum silicate fiber refractory felt is prepared by dipping an aluminum silicate fiber felt in nanometer aerosil slurry, then drying the aluminum silicate fiber felt, separately connecting the two sides of the aluminum silicate fiber felt with refractory layers, then dipping the aluminum silicate fiber felt in the nanometer aerosil slurry again and carrying out drying, wherein the aluminum silicate fiber felt is prepared from modified aluminum silicate fibers through braiding; the modified aluminum silicate fibers are prepared from kaolin powder, alumina, titanium dioxide, a dispersant, nanometer aerosil, polyimide resin, a silane coupling agent, an aluminum phosphate binder and water; and the nanometer aerosil slurry is prepared from diatomite, activated clay, nanometer aerosil and water. The aluminum silicate fiber refractory felt of the invention can form multilayer heat-insulatiing protection, has good heat insulation performance, can meet the demands of equipment for heat preservation and fire resistance and prevents scalding of operators or damage to articles contacting with the felt caused by too high surface temperature of the refractory felt.

The invention discloses an automatic splitting machine, which comprises a body, a programmable logic controller (PLC), and a roll release shaft, a material storage box, a flattening mechanism, a splitting mechanism, a receiving mechanism and a rolling mechanism which are fixedly connected with the body, controlled by the PLC and sequentially arranged in the feeding direction, and also comprises a plurality of driving rollers and tension shafts. The automatic splitting machine has the advantages that the automatic splitting machine is compact in integral structure, small in floor area, high in speed and efficiency, accurate in splitting, easy to operate and stable in work, material putting deviation is corrected by a deviation rectifying mechanism, the tension is well controlled and timely adjusted through the tension shafts and a tension detector in the working process, and the splitting quality is guaranteed; moreover, the negative pressure material storage box can effectively prevent a material from being deformed or damaged in the material storage box due to gravity action.

The invention provides a waste heat recovery system for a circular cement production grate cooler. The grate cooler comprises a housing and a clinker channel, wherein a thermal insulation material is arranged between the housing and the clinker channel; waste heat recovery equipment is arranged in the thermal insulation material, and comprises a barrel; a heat exchange tube is arranged in the barrel; the barrel and the heat exchange tube are in a concentric circle structure. According to the grate cooler provided by the invention, sensible heat released by a clinker in a cooling machine in a fast cooling process can be fully absorbed; energy consumption of the clinker is reduced; the waste heat utilization quantity can also be effectively improved.

The present invention relates to the field of charging piles and discloses an automatic charging pile which comprises a box body with a containing cavity which is internally provided with a rotation shaft, two rotation seats, a first solenoid valve which is connected to a power supply and a first motor. A winding section is formed between the two rotation seats by the rotation shaft, and one end of the rotation shaft is connected to the first motor through a first transmission structure. One end of an electric wire is connected to a second solenoid valve, and the other end extends out of the box body and is connected to a charging gun. A gap is arranged between the first solenoid valve and the second solenoid valve. The charging gun is provided with keys for controlling the first motor to rotate in forward and reverse directions and controlling the connection of the first solenoid valve and the second solenoid valve. According to the charging pile, through the keys on the charging gun, the connection of the first solenoid valve and the second solenoid valve is operated, the rotation of the first motor in the forward and reverse directions are controlled, the operation is simple, and the charging pile is convenient to use. The electric wire is arranged in the box body, electric wire aging or damage is avoided, an electric shock accident is avoided, and the safety performance is improved. The automatic operation is realized, a manual operation is avoided, and the efficiency is high.

The invention provides a waste heat recovery system for a cement production grate cooler employing square equipment. The grate cooler comprises a housing and a clinker channel, wherein a thermal insulation material is arranged between the housing and the clinker channel; waste heat recovery equipment is arranged in the thermal insulation material, and comprises at least one barrel; a heat exchange tube is arranged in the at least one barrel; the barrel is a rectangle; a plane is arranged at the lower part of the barrel. According to the grate cooler provided by the invention, sensible heat released by a clinker in a cooling machine in a fast cooling process can be fully absorbed; energy consumption of the clinker is reduced; the waste heat utilization rate can also be effectively increased.

The invention discloses a randomly-adjusting arc suppression coil and a route selection device. The turning-off degree of the randomly-adjusting arc suppression coil is adjusted in two steps. When a grid system operates normally, the turning-off degree of the randomly-adjusting arc suppression coil is preadjusted to 20-80% in advance. After a grounding fault of the grid system occurs, the turning-off degree of the randomly-adjusting arc suppression coil is adjusted once again. After the grounding fault of the grid system occurs, the response time of the randomly-adjusting arc suppression coil is shortened, the problem of high overvoltage level caused by slow response time of a randomly-adjusting arc suppression coil device is avoided, and breakdown or damages of certain equipment and weak insulation caused by high overvoltage level are further avoided. Meanwhile, mid-value resistance is utilized to complete fault route selection, successful route selection is ensured, and power distribution reliability is increased. The current randomly-adjusting coil can be utilized without reformation, and the cost is low.

The invention discloses a fully automatic chip stripping machine. The stripping machine comprises a groove type material box loading mechanism, a boundary material stripping mechanism, a chip stripping mechanism, a hollow disc collection mechanism and a film disc multi-station moving and turning mechanism, which are arranged on the same platform. The groove type material box loading mechanism, the boundary material stripping mechanism, the chip stripping mechanism and the hollow disc collection mechanism are successively arranged on the same side with the film disc multi-position moving and turning mechanism side by side. The invention also discloses a working method of the fully automatic chip stripping machine. According to the invention, the fully automatic chip stripping machine is suitable for stripping chips with big areas and thin thicknesses and capable of cleaning boundary materials of chips, stripping the chips, preventing chips from being scratched or damaged and effectively protecting the chips, so working efficiency is greatly improved.

The invention discloses cloud intelligent processing equipment with a safety system. The cloud intelligent processing equipment at least comprises a host, a monitoring system, an evaluation alarming system and a control system. The host is provided. The monitoring system is used for extracting monitoring information, which at least comprises related information of the host and / or the work piece tobe processed in the whole production and processing process; And the evaluation alarming system is used to acquire the standardized calibration information thereof, compare the monitoring informationwith the calibration information, and send out alarming information, when the error between the real-time monitoring information and the corresponding calibration information is greater than a set threshold value delta and overflow occurs. According to the invention, the real-time monitoring and the acquisition of data of the host during product processing can be realized, the data is compared with the standard data, and alarming or correction is carried out, once errors occur, and therefore the error rate control during the process is realized, the product inspection monitoring efficiency isimproved, and the rejection rate is reduced.

The invention discloses a motorcycle antitheft device and relates to the technical field of motorcycle antitheft. The device comprises a hub, a brake and a main switch, a first lock body is fixed to the brake, a protection mechanism is fixed to the top of the first lock body, and a warning box is fixed to the surface of the first lock body. A hub lock is additionally arranged on the hub to lock awheel, and a motorcycle cannot be stolen even in the mode that a thief holds a direction handlebar pipe and pushes the motorcycle; through cooperative use of the hub antitheft lock and a warning device, an alarm song can be sent out when the motorcycle is slightly moved or shakes; through cooperative use of the hub lock and a protection mechanism, the situation that dust, water and the like enterthe hub lock to damage and corrode the hub lock can be avoided, and the behavior of malevolent damage to the hub lock can be warned; and a protection device in linkage with the warning device is arranged on the main switch so that the situation that the motorcycle is started without being unlocked, and a safety accident happens or the motorcycle is damaged due to mistaken operation can be avoided.

The invention discloses a compounding machine. The compounding machine comprises a frame, a plate unwinding mechanism, a film unwinding mechanism, a compounding mechanism, an edge cutting mechanism and a winding mechanism, wherein the plate unwinding mechanism, the film unwinding mechanism, the compounding mechanism, the edge cutting mechanism and the winding mechanism are connected to the frame; a waste edge collecting mechanism is arranged on the edge cutting mechanism on the frame; a cooling circulation mechanism is also arranged on the edge cutting mechanism on the frame and comprises a liquid storage tank, a cooling liquid pipe and a liquid extracting mechanism; the liquid storage tank is fixedly connected to the frame and is located under the edge cutting mechanism; the cooling liquid pipe is provided with a nozzle facing the edge cutting mechanism; the liquid extracting mechanism is arranged between the liquid storage tank and the cooling liquid pipe. The compounding machine is simple in structure; the cooling circulation mechanism is used for cooling a part between a cutter and a plate, so that the deformation or damage of the plate caused by overhigh heat between the cutter and the plate can be avoided.

The invention discloses a cleaning device for a solar battery panel. A water storage tank is arranged on a supporting plate, a supporting assembly comprises a two-dimensional turntable and a telescopic supporting column fixedly arranged on the top of the two-dimensional turntable, and the two-dimensional turntable is arranged on the top of the supporting plate; the bottom surface of a fixed platform is fixedly connected to the top of the telescopic supporting column, a balance adjusting assembly can keep a movable platform in a horizontal state, one end of a connecting plate is hinged to the movable platform while the other end of the connecting plate is fixedly connected to two sides of the supporting plate assembly, rotating shafts are arranged at two ends of the supporting plate assembly, a cleaning tape winds the two rotating shafts, an angle adjusting assembly comprises a top motor of the movable platform, a winding roll arranged on an output shaft of the motor and a steel cable winding the winding roll in a crimped manner, and one end of the steel cable is fixedly connected to the winding roll while the other end of the steel cable is connected to the end, far away from the movable platform, of the connecting plate. The cleaning device can clean the solar battery panel conveniently and is not removed and mounted after cleaning the solar battery panel.

The invention provides a data center control system based on power consumption monitoring. The system includes a strategy database, a strategy engine, a data processing device, a device control device, and a monitoring device; the strategy database, the data processing device, the device control device are all in communication connection with the strategy engine; the monitoring device and the data processing device are in communication connection; effective monitoring of the power consumption can be realized; timely, comprehensive, accurate monitoring of energy consumption is realized; and on the basis, a work situation of a data center is analyzed and judged, and then is managed and controlled, in order to make the data center run more rationally.

The invention discloses a new type vehicle-mounted medical box, comprising a box body and box door, wherein the box body is articulated with the box door, a side surface of the box body is provided with a lock catch, the corresponding box door is provided with a lock nose, the box body is internally provided with a plurality of baffles which separate the interior of the box body into a plurality of cavities, an inner side wall of each cavity is provided with a temperature sensor which is connected with a temperature display arranged above the box body, according to the medical box, the temperature sensor is arranged in a common medical box for monitoring the temperature in the medical box so as to guarantee that the medicine or tools in the medical box can not become unusable due to too high temperature or too low temperature, the medical box has a simple structure and a low cost, is convenient to use, clean and sanitary, and can effectively prevent the medicine or tools from being polluted or damaged.

The invention discloses a solar cell module. The solar cell module comprises a large-sized solar cell panel, an upright and a pulling mechanism; the large-sized solar cell panel consists of more thanone small-sized solar cell panel; the upright is arranged on the right side of the small-sized solar cell panels and is parallel to the small-sized solar cell panels; an elastic airbag is arranged between each two adjacent small-sized solar cell panels; a connection rod is fixedly mounted on the back of each small-sized solar cell panel by a bolt; a sleeve is welded and fixedly mounted at one endof each connection rod; and the sleeves all sleeve the upright. The solar cell module is simple in structure; on windy days, the solar cell panel can be automatically separated to form more than one small-sized solar cell panel and wind can pass through gaps between the small-sized solar cell panels so as to lower a wind receiving surface and avoid blowdown or damage; and in a non-wind case, the small-sized solar cell panels can be automatically spliced, and in the splicing process, the surfaces of the small-sized solar cell panels can be cleaned, so as to avoid dust coverage and improve efficiency.

The embodiment of the invention provides a greenhouse sun-shading system, comprising a sun-shading frame, a sun-shading cover and a reeling mechanism, wherein the sun-shading frame comprises a support frame and a track corresponding to the support frame; the support frame is provided with a plurality of horizontally laminated support parts, and two adjacent layers of the support parts are connected by virtue of a U-shaped connecting part; the track comprises two rails arranged on two sides of the support frame; and the reeling mechanism comprises a reel and a reeling motor, the reeling motor is connected with the reel, moreover, the reel is connected with the track by virtue of a moving pair, and is positioned above the support parts. According to the greenhouse sun-shading system provided by the embodiment of the invention, the reel rotates while moving on the track so as to unfold the sun-shading cover to cover the support parts, or fold the sun-shading cover by rotating while moving on the track, so that not only can the sun-shading cover be automatically unfolded or fold, but also the sun-shading cover can be avoided from deformation or damage as the sun-shading cover does not need to be pulled for moving.

The cloud intelligent system disclosed by the invention at least comprises a terminal, a monitoring system, a communication system and a cloud system / server, and the cloud system / server is at least used for receiving / transmitting data and / or executing comparison and / or feeding back comparison information; the terminal is at least used for executing production and processing operation on the to-be-processed workpiece according to the instruction; the monitoring system is used for extracting data and / or terminal information of the to-be-machined workpiece before the production and machining operation is executed and / or during the production and machining operation and / or after the production and machining operation is executed to obtain monitoring data; and the communication system is used for executing data transmission between the terminal and / or the monitoring system and the cloud system / server. According to the invention, real-time monitoring and acquisition of terminal product processing data and instruction sending and receiving are realized, results are compared, analyzed and evaluated, and efficient wide-area production management and quality evaluation are formed.

The invention provides a data centre optimization method based on power consumption monitoring. The method comprises the following steps that: 1) a power supply and power consumption strategy of a data center server is set; 2) under scheduling of a strategy engine, an equipment control device controls operation of a data center according to a set strategy; 3) a work condition of a power module is monitored in a real-time manner, and a motherboard power interface of the server data center is used for monitoring; 4) data acquired by the step 3) are analyzed and calculated; and 5); an analysis result obtained in the step 4) is fed back to the strategy engine, and the strategy engine judges and controls through the equipment control device an equipment running status of the data center. By using the method, the energy consumption of the data center is monitored in the real-time manner at the equipment level; the monitoring result is analyzed, judged, and controlled; the analysis judgment strategy and rule can be customized; and the good running status of the data center can be effectively guaranteed.

A high-performance silicon carbide semiconductor field effect transistor structure disclosed by the present invention comprises a field effect transistor body, the field effect transistor body comprises a field effect transistor base and a field effect transistor outer cavity, and the field effect transistor outer cavity is internally buckled on the top surface of the field effect transistor base. A plurality of groups of cabling racks are arranged between the field effect transistor base and the field effect transistor outer cavity, three rotating grooves are formed in one side of the field effect transistor base, first hinged shafts are arranged in the three rotating grooves respectively, and T-shaped connecting frames are rotationally connected to the first hinged shafts. The wiring board is provided with the wiring groove, and the wiring groove is arranged to be of a horn-shaped structure with a large left end opening and a small right end opening, so the wiring groove can achieve the integrated installation of a plurality of wires, enables the internal structure assembly of the field effect transistor body to be more reasonable, reduces the fault rate of the field effect transistor base body, and the service life of the field effect transistor base body is prolonged.

The invention discloses a threshold device with shrinkage protection assistance for building construction. The structure of the threshold device with the shrinkage protection for the building construction comprises a door frame and a threshold device body, the threshold device body is arranged on the inside of the door frame and the door frame is attached to the outer surface of the threshold device body, and the threshold device body is embedded on the ground. The threshold device body comprises a main body, a moving threshold block, a holding handle and a fixed threshold block. The thresholddevice with shrinkage protection assistance for building construction has the beneficial effect that under the effect of matching of a roller and a guide slide rail, the two sides of a threshold canshrink towards the middle, a trolley is conveniently pushed into a door, the trolley is prevented from pressing the threshold, and the threshold being pressed to deformation or damage is effectively avoided; under the effect of a guiding booster and an electromagnetic device, the push resistance of the trolley can be effectively reduced, the driving power is improved, and the power to assist is provided; and a dust removal brush can clean dirt attached to the outer surface of the guiding booster, and the guiding booster is prevented from being stuck during rotating.

The invention provides a bridge-cutoff aluminum alloy section heat insulation strip which comprises first heat insulation parts with the two ends forming connection edges and second heat insulation parts fastened longitudinally with the first heat insulation parts. Each first heat insulation part and the corresponding second heat insulation part are each of a sheet structure and form a cavity. The two ends of the second heat insulation parts form shield portions completely covering the side of a bridge-cutoff aluminum alloy section, the first heat insulation parts and the second heat insulation parts are of a split structure, and the second heat insulation parts are flexible parts. The first heat insulation parts are used as frameworks to play a supporting role, and external impurities are prevented from entering the bridge-cutoff aluminum alloy section due to the shield portions, completely covering the side of the bridge-cutoff aluminum alloy section, of the second heat insulation parts fastened to the first heat insulation parts; it is ensured that the bridge-cutoff aluminum alloy section has high strength, meanwhile, the heat insulation strip is prevented from being deformed or damaged in the fastened process, and the preparation cost of the bridge-cutoff aluminum alloy section heat insulation strip is reduced.

The invention discloses an equipment temperature monitoring device for rice industry production. The invention relates to the technical field of rice industry production equipment. The objective of the invention is to solve a problem that an existing temperature monitoring device is poor in working performance. The monitoring device comprises a shell. A regulation and control cavity and an equipment cavity are sequentially formed in the shell from left to right. A vertically arranged control host is arranged in the equipment cavity. A transversely-arranged mounting plate is arranged below thecontrol host, a steering mechanism is arranged at the bottom of the mounting plate, the mounting plate is steered through the steering mechanism, a transversely-arranged connecting plate is arranged above the control host, and the control host is fixed to the top of the mounting plate through screws. The monitoring device is reasonable in structure, capable of effectively monitoring the temperature of the rice processing control device, capable of flexibly regulating and controlling the temperature of the rice processing control device, high in working performance and convenient to overhaul and maintain and it is convenient for a user to overhaul and maintain the rice processing control device.

The invention discloses a flatbed road wrecker with a small dip angle. The flatbed road wrecker comprises a chassis and a carriage mounted on the chassis; a gantry is connected to one end, near the head of the wrecker, of the carriage; a flat frame is hinged to one side, near the head of the wrecker, of the gantry; the other end of the flat frame is fixedly connected with a first lifting frame located under the carriage; one end of the first lifting frame is embedded in a second lifting frame; a first hydraulic rod is mounted outside the first lifting frame and the second lifting frame; the second lifting frame is hinged to the chassis through a second hydraulic rod; and a hoist is mounted on the gantry. The flatbed road wrecker disclosed by the invention can meet the requirement of safe loading and unloading of an automobile of which the chassis is only 30cm above the ground, and solves the problems a hauled automobile is damaged during loading and unloading or cannot be loaded or unloaded due to too low chassis existing in a conventional wrecker.

The invention belongs to the technical field of navigation marks, and discloses a navigation mark protection device. The navigation mark protection device comprises a main mark ship and an auxiliary mark ship. The main mark ship is provided with a navigation mark lamp and a first anchor cable pile. The front end and the rear end of the auxiliary mark ship are each provided with a second anchor cable pile. The auxiliary mark ship is further provided with an automatic alarming device. When the included angle between the auxiliary mark ship and the horizontal direction is larger than or equal tothe set angle, the automatic alarming device can send an alarming signal. When the navigation mark protection device is applied, when a huge winding material generates tension through water flow, onlythe auxiliary mark ship for protecting can be pulled to be sunken, the buoyancy force of the auxiliary mark ship counteracts pull sinking force, the navigation mark lamp on the main mark ship is protected, the situation that the navigation mark lamp loses the effect or is damaged due to the fact that the main mark ship is inclined or is tuned over and sunken is avoided, meanwhile, alarming can besent timely to a construction brigade for processing the winding material on the auxiliary mark ship and overhauling the auxiliary mark ship, and normal passage of a navigation channel is ensured.

The invention discloses a supporting structure suitable for a building unit and a building containing the same, and belongs to the field of bamboo material buildings. The building unit corresponding to a cylindrical structure is provided with the supporting structure formed by bottom brackets and connecting rods in a connected mode, thus after the building unit is placed on the ground through thesupporting structure, the arc faces of the upper ends of the bottom brackets correspondingly and tightly attached to the bottom face of the building unit to provide support for the building unit, andthrough correspondingly arranged lifting parts on the supporting structure, lifting of the building unit without being directly acted can be effectively realized. According to the supporting structuresuitable for the building unit and the building containing the same, the supporting structure is simple in composition, arrangement is simple and convenient, bearing and lifting of the building unitcan be effectively realized, direct placement and use of the building unit and structural deformation or damage possibly caused in the direct lifting process are avoided, the service life of the building unit is prolonged, the application cost of the building unit is reduced, and good application and popularization value is achieved.

The invention relates to the field of electronic products and accessories, and discloses an anti-kicking ash removal base device for a computer host. A first spring is fixedly connected to the surfaceof the base, a sliding rod is fixedly connected to the inner surface of the base, a sliding part is slidably connected to the surface of the sliding rod, and a connecting rod is rotatably connected to the top end of the sliding part. A bottom plate is hinged to the end, away from the sliding piece, of the connecting rod, magnets are fixedly connected to the bottoms of the two ends of the bottom plate, a computer host body is fixedly connected to the top end of the bottom plate, and a first telescopic rod is fixedly connected to the inner surface of the base. By arranging a first sliding rail,a second sliding rail, a sliding wheel, a connecting block, a second telescopic rod and a rolling brush, a device capable of cleaning back and forth is formed, the surface of a computer main body canbe cleaned back and forth, hosts of various types can be used due to the action of the second telescopic rod and a spring, and the applicability of the device is enhanced.

The invention discloses a special sucking-up device for an automobile storage box internal covering tooling and relates to a tooling fixture. The special sucking-up device comprises a tooling support, wherein a glass fiber reinforced plastic anticorrosion layer is arranged on the surface of the tooling support, a rubber pad is arranged at the bottom of the tooling support, a guide plate is horizontally arranged at the top of the tooling support, a hydraulic cylinder is arranged along the vertical direction on the guide plate and the free end of a piston rod of the hydraulic cylinder penetrates through the guide plate and is connected with a limiting plate. The special sucking-up device additionally comprises a cylindrical guide pillar, the guide pillar is vertically and movably connected with the guide plate, the lower end of the guide pillar penetrates through the guide plate and is connected with the limiting plate, an electromagnet is arranged on the lower surface of the limiting plate, a limiting switch is arranged on the limiting plate and a control switch is arranged on the tooling support. The special sucking-up device for the automobile storage box internal covering tooling has the advantages that the covering tooling can be taken out from the internal part of the storage box along the vertical direction and does not touch the side wall of the inner chamber of the storage box, the flocking quality is improved and the practicability is very high.

The invention discloses pipeline detection equipment based on a Internet of Things technology. The equipment comprises an equipment body, wherein a moving mechanism is arranged in the middle of the equipment body. The moving mechanism comprises a circular ring, four connecting rods and four moving assemblies, wherein a driving assembly is arranged in the equipment body, a shell of the equipment body is sleeved with the circular ring, and the driving assembly is in transmission connection with the circular ring through first teeth. Each moving assembly comprises a base, a cleaning unit, a driving unit and a moving unit, wherein the driving unit is located on the base, and the driving unit is in transmission connection with the cleaning unit and the moving unit. In the invention, the driving assemblies control the circular ring to rotate, so that the positions of the four moving assemblies are adjusted, and obstacles or damaged positions on the inner wall of the pipeline are avoided; and the driving units control the cleaning unit to clean away obstacles in front of the base while controlling the base to move forwards through the moving units. In conclusion, the equipment can reliably and stably move in the pipeline, and the detection efficiency of the detection equipment is improved.

The embodiment of the invention discloses a flash memory data refreshing method and device, relates to the technical field of flash memory refreshing, and is used for solving the problem that a flashmemory data refreshing mechanism in the prior art may cause that the data storage duration of part of flash memory blocks exceeds the reliable storage duration. The method comprises the steps of obtaining a data storage time length of each flash memory block of terminal equipment; judging whether a to-be-refreshed flash memory block exists or not, wherein the to-be-refreshed flash memory block isa flash memory block of which the data storage time length is greater than the threshold time length; if it is determined that the to-be-refreshed flash memory block exists, judging whether the stateof the terminal device meets a preset condition or not; and refreshing the data stored in the to-be-refreshed flash memory block under the condition of determining that the state of the terminal device meets a preset condition. The embodiment of the invention is used for refreshing the data stored in the flash memory.

The invention belongs to the field of hydraulic devices and particularly relates to a work method for protecting a hydraulic cylinder against damage. According to the work method, a body of the hydraulic cylinder is involved, a piston cavity is formed in the body, a spring for buffering is arranged in the piston cavity, a piston is connected with the piston cavity in a sliding manner, the two sides of the piston are both connected with piston rods, seal rings are arranged at gaps between the body and the piston rods, and a seal ring is arranged at the connection position between the piston andthe body. The body is provided with a first oil opening and a second oil opening which are used for feeding work oil. The first oil opening is located on the left side of the piston. The second oil opening is located on the right side of the piston. The piston rods are provided with u-shaped pipes. The body is provided with a first gas pipe communicating with the outer side and a second gas pipeextending into the piston cavity. The inlet end of the first gas pipe is connected with an external high-pressure gas pump. When the piston moves to the maximum travel position, the u-shaped pipes enable the firs gas pipe and the second gas pipe to communicate. By the adoption of the work method for protecting the hydraulic cylinder against damage, the impact caused by the piston on the hydrauliccylinder can be reduced, and the hydraulic cylinder is protected against leaks and damage.

The high-precision hole machining tool comprises a support, an air cylinder is arranged on the support, a drilling tool is arranged below the air cylinder, a protection assembly is arranged on the drilling tool, and the protection assembly is used for restraining shaking generated at the moment when the drilling tool drills through a workpiece and preventing the drilling tool from being damaged due to violent shaking. A clamping assembly is arranged below the protection assembly and used for fixing a workpiece in the drilling process, the workpiece is prevented from flying out along with rotation of the drilling tool in the drilling process, it is guaranteed that drilling is conducted smoothly, and the drilling efficiency is improved. The clamping assembly is further used for limiting the drilling tool after the drilling tool drills through the workpiece, the drilling tool is prevented from shaking after drilling is completed, the problems that the drilling precision is low and the drilling tool is damaged due to shaking of the drilling tool are solved, and the acting force of the clamping assembly on the workpiece is in direct proportion to the pressure of the drilling tool on the workpiece.