196results about How to "Prevent rust" patented technology

The utility model discloses an ammonium nitrate solution concentration blending reation kettle with anti -explosion function belongs to reation kettle equipment technical field, the utility model discloses a reation kettle body is communicated with the discharge valve at reation kettle body bottom, can carry out even heating to solution through the electric heating plate in the reation kettle body inner wall bottom groove, avoid local temperature too high and cause ammonium nitrate to decompose gas and cause explosion, the cooperation design of stirring rod and top motor can carry out sufficient stirring to ammonium nitrate solution in reation kettle, make solution concentration distribution even. The annular ring and the explosion -proof pipe fixedly connected with the annular ring that reation kettle body surface sets up up and down, effectively enhanced the overall structural strength of reation kettle, the gas outlet pipe of top annular ring and the gas inlet pipe of bottom annular ring mutually cooperate, and the outside cold gas enters the space between the explosion -proof pipe and reation kettle body, and then even cooling is carried out to reation kettle body, and then gas is discharged to the outside from the gas outlet pipe, and the device has the advantages that the explosion -proof effect is good.

The present application relates to the technical field of electric control switch, in particular to a kind of motorcycle disc brake control switch, including shell, two wiring copper sheets, electricity connection copper sheet, slider and cover plate, installation cavity is provided in the shell, installation groove is opened in the symmetrical two inner side walls of installation cavity, and two The wiring copper sheet is fixedly inserted in installation groove;The present application is closed by the setting of cover plate and sleeve, the part of wiring copper sheet in installation cavity is isolated with external environment with electricity connection copper sheet, and the inside of the position of wiring copper sheet through shell can be sealed with sealing glue, simultaneously still can be filled into inert gas in installation cavity, to avoid the water vapor in environment into installation cavity, cause the part of wiring copper sheet in installation cavity and electricity connection copper sheet corrosion Problem, guarantee the conductive property of wiring copper sheet and electricity connection copper sheet, guarantee the stability and waterproof performance of motorcycle disc brake control switch.

The utility model discloses a connecting structure for an outdoor tent structure framework, which comprises a connecting piece, a rain shielding piece and a plurality of connecting rods, the connecting rods are arranged on the side surface of the connecting piece and hinged with the connecting piece, the connecting rods are arranged at intervals, the distances between the adjacent connecting rods are the same, and the connecting rods are used for connecting a support framework of a tent; the rain sheltering piece is arranged above the connecting piece and used for sheltering the connecting piece from rain; according to the tent, the structure of the connecting piece is improved, the umbrella-shaped rain sheltering piece is additionally arranged at the top of the connecting piece, the rain sheltering piece is in threaded connection with the connecting piece through the threaded rod, the rain sheltering piece can prevent rainwater from spraying the top end of the tent, and therefore the phenomenon of water seepage or water dripping at the top of the tent is avoided; in addition, the rain sheltering pieces can prevent rainwater from spraying the hinge points of the connecting pieces and the connecting rods so as to prevent the hinge points of the connecting pieces and the connecting rods from rusting or being corroded by rainwater, and therefore the service life of the tent is prolonged.

The utility model discloses a rust-proof anchor windlass which comprises an engine, a speed reducer and an anchor chain wheel. The engine and the speed reducer are connected through the coupler, and the speed reducer and the cable lifter are connected through the gearbox. A protective shell is arranged on the periphery of the cable lifter and composed of side plates, a top cover and a bottom plate. An air inlet channel extends from the right side plate, and a fan is mounted in the air inlet channel; vent holes are formed in the tops of the side plates; the top cover is hinged to the side plates through hinges, and baffles extend downwards from the periphery of the top cover. A hole is formed in the rear side plate, and an anchor chain is arranged in the hole and connected with an anchor chain wheel. Through the synergistic effect of the engine, the speed reducer, the gear box and the cable lifter, dragging, anchor weighing and anchor dropping operations of an anchor chain are achieved; meanwhile, through the design of the protective shell, the cable lifter and the anchor chain are effectively prevented from being corroded by the external environment, particularly rusting is prevented, the service life of the cablelifter is prolonged, and the reliability of the cablelifter is improved.

The utility model provides a kind of water-based ink production stirring mixing equipment of high efficiency processing, it is related to ink production stirring technical field, including support, stirring barrel is installed on the support, vertical fixed mounting is installed in the one side of support, mounting box is provided on the stand, rotation is provided with the shaft on the mounting box, driving mechanism is provided in the mounting box, the driving mechanism is connected with the shaft and drives the rotation of the shaft, the shaft rotation is installed in the mounting box, the shaft is provided with scrape and stir component, the scrape and stir component is arranged in the stirring barrel.The utility model is scraped by stirring paddle and bottom scraper collaborative work, while stirring ink, the material deposited in the bottom of barrel is scraped, prevent the material of barrel bottom from long-term accumulation and affect mixing uniformity.Ladder type arrangement's side wall scraper covers the full height of barrel wall, effectively removes the ink attached on barrel wall, avoid material waste, prevent ink residue and lead to equipment corrosion.

The utility model provides a kind of split type electric vehicle frame connecting mechanism, it is related to electric vehicle frame technical field, comprising: front frame, front frame side is equipped with rear frame, and rear frame is fixedly installed with battery, and upper rain cover is equipped between front frame and rear frame, and the bottom of upper rain cover is equipped with lower rain cover.This kind of electric vehicle frame connecting mechanism is set by in-place assembly, can use the cooperation of clamping groove and clamping block, make front frame expand to correct position, temporarily limit front frame, to prevent the rotation of front frame when bolt and nut are used to connect front frame and rear frame, so as to facilitate user to connect front frame and rear frame, and through the setting of rain cover assembly, the contact of rain and front frame and rear frame can be reduced, to prevent rust.

The present application relates to the technical field of transmitter, in particular to a kind of anti-condensation wind pipe type temperature transmitter, including the mounting bracket of fixed installation in the side wall of ventilation pipe, humidity detection component is fixedly installed in mounting bracket, temperature sensing tube is rotatably installed outside humidity detection component, the motor for driving temperature sensing tube rotation is fixedly installed in the side wall of mounting bracket, the dew removal device for removing condensation is equipped outside temperature sensing tube, both ends of temperature sensing tube are equipped with plugging component, and plugging component removes the plugging of temperature sensing tube end when temperature sensing tube rotates.The present application utilizes low-temperature high-humidity condition to trigger temperature sensing tube rotation, removes condensation by centrifugal throwing, and cooperates with reciprocating scraping to completely remove surface condensation, simultaneously utilizes friction micro-heat to improve pipe wall temperature, which is higher than dew point temperature, to inhibit condensation from generating again from source, while ensuring temperature measurement accuracy, significantly reduces equipment power consumption, solves the problems of poor anti-condensation reliability, high energy consumption and serious temperature measurement drift of traditional products.

The utility model relates to the technical field of stainless steel water pipes, in particular to a combined connection type stainless steel water pipe. According to the technical scheme, the stainless steel water pipe comprises a stainless steel water pipe body and a combined connecting ring, annular connecting inserting grooves are formed in the positions, close to the edges, of the upper surface and the lower surface of the combined connecting ring, and the ends of the stainless steel water pipe body are located in the annular connecting inserting grooves; a plurality of threaded holes are formed in the positions, close to the upper surface and the lower surface, of the outer surface of the combined connecting ring in an annular array at equal intervals, fixing screws are movably inserted into the threaded holes, and a drill bit is fixedly connected to one ends of the fixing screws through fixing connecting rods. The stainless steel water pipe connector facilitates quick connection of stainless steel water pipes, improves working efficiency, facilitates follow-up disassembly, and also improves scene applicability.

This utility model relates to the field of auxiliary equipment for construction engineering, and discloses a portable material classification, storage, and transportation box for construction engineering. The box includes a storage box with two fixed plates fixedly connected to its bottom inner wall. A motor is fixedly connected to the inner wall of one of the fixed plates, and a gear is fixedly connected to the drive end of the motor. Connecting rods are rotatably connected inside both fixed plates, and a gear is fixedly connected to the outer wall of one of the connecting rods. Transmission plates are fixedly connected to the outer walls of both connecting rods, and connecting rods are fixedly connected to the inner walls of both transmission plates. This utility model reduces the corrosion of the box material by rainwater and acidic or alkaline liquids such as construction site concrete slurry, prevents aluminum alloy oxidation and steel plate rusting, maintains structural strength, and the sealed structure reduces the leakage of volatile gases while preventing the intrusion of external corrosive gases, ensuring the chemical stability of the materials.

The utility model relates to the technical field of extension driving equipment, in particular to an extension driving device of an electric driver, which comprises a driving rod connected to ground driving equipment and a control rod connected to an underground valve, and the bottom end of the driving rod is connected with a transmission rod through a universal joint. The end, away from the driving rod, of the transmission rod extends into the ground and is connected with a power output rod through a universal joint, and the bottom of the power output rod and the top of the control rod are fixedly installed. By means of the driving rod, the universal joint, the transmission rod and the power output rod, power of ground electrically-driven equipment can be transmitted to a control rod of an underground pipeline valve, extended driving of the electric driver is achieved, and the electric driver can be conveniently used in the underground space which is too small and can be used for driving the underground pipeline valve. And meanwhile, the overground electric driving equipment can be better protected, and the situation that the service life of the electric driver is affected by the underground humid environment is avoided.

The utility model discloses a transport case for well drilling bits, which belongs to the technical direction of well drilling bit transport and comprises a drill bit transport case, four groups of damping base plates are fixedly mounted on the periphery of the bottom of the drill bit transport case, and two groups of first placing grooves are arranged at two ends in the drill bit transport case. A second containing groove is formed in one side of the interior of the drill bit conveying box, a plurality of sets of ventilation holes are further formed in one side of the interior of the drill bit conveying box in an array mode, and through cooperative use of a drill bit conveying plate, a rubber buffer plate and an activated carbon dehumidification plate, anti-collision protection operation can be conducted on the two ends of the drill bit conveying box in the conveying process; according to the drilling bit transportation box, the situation that the drilling bit transportation box collides in the transportation process, and consequently the drilling bit transported in the drilling bit transportation box is damaged is avoided, meanwhile, dehumidification and damp-proof operation can be conducted on the drilling bit in the transportation process, and the drilling bit is prevented from being rusted in the transportation process; and dustproof protection operation can be carried out on the drilling bit in the dismounting process.

The utility model discloses a fixed base of horizontal centrifugal pump, which comprises a first horizontal plate and a second horizontal plate, the second horizontal plate is abutted on the ground, the second horizontal plate is connected with the first horizontal plate through a supporting plate, a base is symmetrically arranged on the first horizontal plate, a centrifugal pump is fixedly connected on the base to be arranged above the first horizontal plate, a cable routing column is arranged on the first horizontal plate, a control box is arranged on the cable routing column, a control cable connected between the control box and the centrifugal pump is arranged in the cable routing column, a cable horse leg is arranged on one side of the first horizontal plate to fix the power cable of the centrifugal pump. The fixed base of horizontal centrifugal pump avoids the direct placement of the centrifugal pump on the ground, the rust caused by the ground moisture, and the problem of large vibration caused by uneven ground, and the control cable and power cable of the centrifugal pump are arranged more regularly and beautifully.

The utility model discloses a built-in fixing structure of a bus handrail base, and belongs to the technical field of bus interior decoration devices. The device comprises a handrail arranged in a carriage; the armrest is characterized in that a cavity is arranged at the connecting part of the lower bottom of the armrest and the carriage bottom plate; an inner joint is mounted in the cavity; a positioning hole is formed in the position, opposite to the inner connector, of the compartment bottom plate. A positioning piece is arranged on the inner joint; one end of the positioning piece penetrates through the positioning hole and then is installed on the lower portion of the carriage bottom plate. The handrail base fixing structure effectively solves the problems that a traditional handrail base fixing structure used at present is prone to dust accumulation, inconvenient to clean and prone to loosening.

The utility model discloses a water tank for hydrogen-rich water, and relates to the technical field of hydrogen-rich water storage, the water tank comprises a water storage tank, the lower side of the water storage tank is fixedly connected with four supporting legs which are distributed in a rectangular shape, and the front side and the rear side of the bottom of the water storage tank are fixedly connected with two water passing pipes which are distributed front and back; two ventilation pipes distributed left and right are fixedly connected to the positions, close to the left side and the right side, of the lower side of the water storage tank, connecting mechanisms are fixedly connected to the lower sides of the four ventilation pipes, and damping mechanisms are fixedly connected to the lower sides of the connecting mechanisms. According to the water tank for the hydrogen-rich water, the state of the shock absorber is adjusted through the telescopic rod, then shock borne by the water storage tank is absorbed through the shock absorber, influences of external shock on the hydrogen-rich water in the water storage tank are avoided, and the storage time of the hydrogen-rich water is prolonged; meanwhile, the situation that the hydrogen in the hydrogen-rich water is separated from the water, the pressure in the water storage tank is too large, and safety is affected is avoided.

This invention discloses a dry cleaning method for stains on the inner wall of a flared tube. The method involves inserting a cleaning needle, longer than the flared end, into the flared end of the tube. The front end of the cleaning needle forms a seal with the tapered hole created during the flaring process. A cleaning space is provided between the flared inner hole of the tube and the outer diameter of the matching cleaning needle. An injection hole is provided along the axial direction of the cleaning needle, and a jet nozzle is provided laterally at the bottom of the injection hole, leading to the cleaning space. The airflow injected from the injection hole into the cleaning space flows backward along the inner wall of the flared inner hole, blowing away the stains adhering to it. This method solves a series of problems associated with traditional technologies such as water-based cleaning agents and solvent cleaning, including complex production processes, wastewater and VOC emissions, low production efficiency, and high costs. The method cleans stains effectively, eliminates concerns about rust, is non-toxic and harmless, ensures safe operation, is simple in process, has high production efficiency, and produces reliable product quality.

The utility model relates to the technical field of pipeline installation and fixation, in particular to a water pipe hanging rack which comprises a water pipe hanging rack body, one side of the water pipe hanging rack body is bent downwards to form a bearing bottom plate, the water pipe hanging rack body and the bearing bottom plate form a side concave structure with an opening in the side wall, two water pipe side baffles are arranged on the top, and the two water pipe side baffles are arranged on the side wall of the water pipe hanging rack body. The water pipe side baffles are symmetrically arranged on the two sides of the water pipe hanging frame, the water pipe hanging frame and the water pipe side baffles form a U-shaped structure used for containing a water pipe body, and the water pipe body is wound in the U-shaped structure. The utility model effectively solves the problems that the water pipe is easy to slip and loosely wind due to an open structure in the prior art, is corroded by accumulated water due to lack of a waterproof layer, and is difficult to adapt to multi-scene mounting and dismounting due to a single fixing mode; the purposes that the laterally-concave U-shaped structure restrains the water pipe to prevent the water pipe from falling off, the waterproof layer and the anti-rust treatment are resistant to corrosion, the detachable mounting plate achieves multi-scene adaptation, and the fixing reliability, durability and mounting flexibility are synchronously improved are achieved.

The utility model discloses a net belt structure of quick freezer, including the main part, the inside of main part is provided with transmission mechanism, the top side fixedly connected with feeding pipe of main part, the inside below of main part is provided with cleaning device one side close to feeding pipe, the cleaning device includes: cleaning brush, through the sealing bearing rotation connection in the wall below of main part one side close to feeding pipe. The utility model relates to quick freezer technical field, and the net belt structure of quick freezer, through the cleaning device to the food residue that net belt surface adhered carries out overall cleaning, and the sewage produced in cleaning can be in time to the outside and is discharged, for the filter plate of residual retention in the filtration process, and the operator can conveniently take out and clean, and the ultraviolet lamp continues to the net belt structure and carries out all -round disinfection, and the main part and transmission mechanism can obtain the depth cleaning, and effectively prevent the bacteria breeding.

The utility model relates to the technical field of filter elements, and discloses a high-precision filter element for a hydraulic filter, which comprises a bottom cover and a top cover, an inner support component is arranged between the bottom cover and the top cover, a stainless steel filter screen component is arranged on the outer side of the inner support component, and an outer filter component is arranged on the outer side of the stainless steel filter screen component. According to the high-precision filter element for the hydraulic filter, the inner supporting assembly, the outer filtering assembly and the stainless steel filter screen assembly are arranged, through the design of a vertical rod support and an annular support, the strength of the interior of the high-precision filter element can be improved, and the situation that the filter element is concaved inwards due to external force is avoided; meanwhile, the PP cotton layer, the ultrafiltration membrane layer and the glass fiber filtering membrane layer which are designed in a double-layer mode are adopted, multi-layer filtering can be achieved, the filtering effect can be improved to the maximum extent, the stainless steel filter screen assembly can conduct secondary filtering, and the stainless steel filter screen assembly made of stainless steel can be prevented from being rusted, is safer and can be used for a long time.

The utility model relates to the technical field of motor vehicle accessories, and specifically discloses a waterproof and dustproof protection type ignition coil, which comprises an ignition coil body, a protective cover is installed on the outer ring surface of the ignition coil body, a lower end of the protective cover is provided with a matching cover, and a sealing cover is hingedly connected to the upper end of the protective cover. In the utility model, the casing, the matching cover and the protective cover form a relatively sealed space, and the ignition coil body is located in the space, which effectively plays a waterproof and dustproof effect on the sealing element of the ignition coil body, thereby avoiding damage to the sealing element of the ignition coil body caused by external water and dust. In addition, the upper side of the protective cover is provided with a sealing cover, so that the upper end of the ignition coil body can be sealed and protected by the sealing cover, thereby avoiding damage to the upper end device and bolts of the ignition coil body caused by external dust and water, and further improving the service life and stability of the ignition coil when used in harsh environments.

The utility model discloses a wear-resistant fluorine-lined ball valve, which comprises a valve body, a valve end and a valve shaft, one side of the valve body is fixedly provided with a shaft sleeve, the valve shaft is matched with the valve body for use, one side of the shaft sleeve is movably connected with a lubricating component, and the lubricating component is sleeved on the periphery of the valve shaft. The shaft sleeve is fixedly installed on one side of the valve body, the valve shaft and the valve body are used in a matched mode, the lubricating assembly is movably connected to one side of the shaft sleeve, the lubricating assembly is arranged on the periphery of the valve shaft in a sleeved mode, and oil communicated with the shaft sleeve is stored in the lubricating assembly. Therefore, the position of the valve shaft, which is easily rusted and is stuck, of the fluorine-lined ball valve can be lubricated and protected by using the lubricating assembly, oil is regularly added into the lubricating assembly, so that the critical positions of the valve shaft, the shaft sleeve and air are lubricated in a normalized manner, and the fluorine-lined ball valve can be stably used when needing to be used.

The application relates to the technical field of gate, in particular to a mine waterproof gate automatic belt rack, which comprises a base plate, the middle part of the upper surface of the base plate is fixedly connected with the bottom of a supporting frame, the top of the supporting frame is fixedly connected with one side of the bottom of a side power box, the middle position of the bottom of the side power box is slidably sleeved with the outer circumferential surface of the top of a lower sliding pipe, the bottom of the lower sliding pipe is fixedly connected with the top of a supporting sleeve, and the bottom of the outer circumferential surface of the supporting sleeve is fixedly connected with one end of a first rotating frame. The top limiting plate is arranged, the top supporting plate is close to the center under the power action of the inclined rod, the fixing of the top equipment of the rack is realized, various specifications and sizes of gate belt equipment can be adapted, different specifications of accessories cannot be safely matched, the rack needs to be disassembled, and the rack can adapt to various working environments during use.

The utility model relates to a box bottom cable moistureproof threading connection structure of a distribution box, comprising a distribution box body, the bottom of the distribution box body is provided with two wire inlets which are symmetrically distributed left and right, the distribution box body is internally provided with four moistureproof assemblies, every two of the four moistureproof assemblies are in one group, and the other two of the four moistureproof assemblies are in one group. The moisture-proof assemblies are symmetrically distributed up and down, each group of moisture-proof assemblies is mounted through a wire inlet, each moisture-proof assembly comprises a mounting base and a sealing ring, a cable enters the distribution box body through the interior of the mounting base, and after the cable is connected with an electrical element in the distribution box body, gas is injected into the cavity through the gas nozzle, so that the electrical element in the distribution box body is sealed. The sealing ring is tightly attached to the gap between the cable and the mounting base after expansion, so that a physical barrier is formed, moisture is effectively prevented from entering the box body, and cable insulation layer aging, metal part corrosion or short circuit faults caused by the moisture are avoided.

The utility model discloses a kind of heating disc and the liquid heater applied to it, it is related to heating disc technical field, comprising have: stainless steel contact layer, the stainless steel contact layer is used to directly contact with liquid, realize the heating conduction of liquid;Stainless steel base layer, the stainless steel base layer is used to bear thick film circuit or heating element, realize heat generation and conduction;Aluminum alloy soldering layer, the aluminum alloy soldering layer is between stainless steel contact layer and stainless steel base layer, for the welding of auxiliary stainless steel contact layer and stainless steel base layer;Stainless steel contact layer and stainless steel base layer of using S316 or S304 material, collocation porous aluminum alloy soldering layer, avoid heating disc surface rust, corrosion, prolong the service life of heating disc, while enhanced the overall structural stability of heating disc, and effectively improve heating efficiency, shorten the time of liquid heating.

This invention relates to the field of glass furniture molding technology, specifically to a glass furniture molding mold, comprising: a molding mold body with an inlet pipe and an outlet pipe installed on both sides; a water blowing pipe, which has a "T" shaped structure and one end of the water blowing pipe is connected to the inlet pipe; and a fixing block, which is fixedly connected to an injection head that matches the molding mold body, and the fixing block is hinged with a lever plate. The beneficial effect is that cooling water is injected into the molding mold body through the inlet and outlet pipes to quickly cool the molded glass furniture. When the injection head moves away from the molding mold body, it drives the fixing block to move synchronously. Then, through the cooperation of the lever plate and the push plate, the movable plate is driven to rise along the water blowing pipe. During the rising process, the movable plate, through the cooperation of the push rod and the piston, injects the gas inside the air storage cylinder and the water blowing pipe into the interior of the inlet pipe, and then presses it into the cooling pipe inside the molding mold body to blow out the residual water inside the molding mold body.

The utility model discloses a kind of high-efficiency stable microcomputer five-prevention devices, it is related to five-prevention locking technical field, to solve the problem that the operating efficiency of gear-rack transmission mechanism is often used in mechanical locking in prior art, easy to wear, cannot guarantee the stable operation of locking device. In the utility model, user can operate locking mechanism and locking mechanism with one hand, and the transmission mechanism of the utility model adopts spring, compared with traditional gear-rack transmission mechanism, this reduces operation delay, improves response speed, reduces the wear between components, makes unlocking process more efficient, device more stable.

The utility model relates to the technical field of water supply pipeline sealing, and discloses a water supply pipeline butt joint sealing enhancing device which comprises a sealing mechanism, the two ends of the sealing mechanism are connected with pipeline mechanisms, the outer surface of the sealing mechanism is sleeved with a protection mechanism, the sealing mechanism comprises a sealing pipe, and the two ends of the sealing pipe are fixedly provided with second connecting flanges. Connecting gaskets are fixedly arranged on the outer surfaces of the two second connecting flanges, each connecting gasket comprises a gasket body, waterproof sealant is arranged in each gasket body, a liquid outlet is formed in the middle of one side of each gasket body, and a movable groove is formed in the surface of one side of each second connecting flange. And ejection rings are arranged in the two movable grooves in a sliding manner. According to the water supply pipeline system, the sealing mechanism and the protection mechanism are arranged, so that the problems of untight sealing, insufficient protection and the like in the prior art are effectively solved, the reliability of the water supply pipeline system is remarkably improved, and the service life of the water supply pipeline system is remarkably prolonged.

The utility model discloses a novel protection layer structure of a prefabricated vertical component, which relates to the field of concrete structure construction, the cross section of the structure is a component main body of a rectangular cylinder, a main framework support is arranged in the component main body, a groove is arranged on the side surface for accommodating a transverse steel bar, a curved surface reed is arranged at the opening of the groove, and U-shaped hooks inclined inwards are arranged at the two ends of the component main body. Materials of the main framework are selected according to the thickness of a vertical component, and a component body is filled with fine aggregate concrete or high-strength mortar. The working mechanism is as follows: firstly prefabricating the tire membrane, installing the main framework and the hook during cast-in-place, and pouring the filler. The structure can effectively avoid many defects caused by the fact that the protective layer is too thick or too thin, and compared with the prior art, the structure has the remarkable beneficial effects of guaranteeing structural stability, preventing steel bar corrosion, improving construction quality and structural performance and the like.

A simple prefabricated stair grouting hole turnover protection device comprises a cast-in-place platform plate, an anchor head, a prefabricated bolt and a bolt sleeve, a prefabricated stair is located above one side of the cast-in-place platform plate, the anchor head used for fixed connection is reserved in the cast-in-place platform plate, and the upper end of the anchor head is fixedly connected with the prefabricated bolt; one end of the prefabricated bolt is inserted into a grouting hole of the prefabricated stair, the top of the prefabricated bolt is sleeved with a bolt sleeve, a gasket is fixed to the top of the bolt sleeve, and the top of the gasket is movably connected with a pull ring. The device can effectively prevent construction waste such as rainwater and dust from entering the hole, corrosion of the prefabricated bolt is prevented, the later grouting quality is improved, compared with a traditional protection method, the device reduces the later manual hole cleaning difficulty, the hole cleaning workload is greatly reduced, the construction efficiency is improved, the device has the characteristic of being capable of being turned over, and the construction cost is reduced. And the material loss is less, so that the consumption of disposable materials is reduced, and the construction cost is reduced.

The utility model discloses a steam turbine high pressure cylinder rear shaft seal body and contain the shaft seal body's axle end seal structure, wherein, steam turbine high pressure cylinder rear shaft seal body includes the shaft seal main part, the annular seal key of section is L type, steam turbine high pressure cylinder rear axle end seal structure includes end take steam seal body, and rear shaft seal body, and the inner wall of end take steam seal body, and every circle steam seal block installation groove all have inserted steam seal block, form SSR chamber between second compartment and steam cylinder body, and form CF chamber between end take steam seal body, shaft seal main part, rotor axle and steam cylinder body. Advantage: the utility model sets up two independent chambers of SSR chamber and CF chamber, effectively reduces the pressure that end take steam seal body suffered, and steam leakage amount is reduced greatly, breaks through the steam leakage bottleneck of traditional single chamber design, and L type seal's metal face contact is matched with steam cylinder body seal groove, can adapt to steam cylinder body thermal deformation, maintains the stability of sealed clearance, avoids the clearance increase due to deformation.