350 results about "Protective shield" patented technology

The utility model relates to the technical field of water conservancy projects, in particular to a water conservancy project underwater surveying and mapping instrument fixing device. Comprising a transverse plate and an auxiliary assembly, the auxiliary assembly comprises a hanging rod, a mounting plate, a mounting frame, a measuring equipment main body, a protective cover and a locking component, during use, the measuring equipment main body mounted on the mounting frame can measure the density and pressure of water quality in a surveying and mapping area, and safety protection can be achieved through the outer protective cover in the measuring process; the measuring equipment main body is prevented from being impacted externally, so that the safety of the measuring instrument can be protected in the early-stage measurement working process of underwater surveying and mapping, the influence on the detection accuracy and even the damage caused by the impact of aquatic organisms or sundries are avoided, and the safety measurement is facilitated.

The utility model relates to the field of sluice foundation detection, and discloses a sluice foundation subsidence displacement observation device which comprises a base, a stand column fixed in the middle of the top of the base, scale marks engraved on the side wall of the stand column, a connecting seat sleeved on the side wall of the stand column, a pointer fixed at one end of the top of the connecting seat close to the scale marks, and a circular seat fixed at the top end of the stand column. A buzzer is fixed to the top of the circular base, monitoring mechanisms are arranged at the two symmetrical ends of the bottom of the circular base, a transparent protective cover is fixed to the top of the connecting base, a monitoring camera is arranged in the transparent protective cover, and the monitoring camera and the connecting base are fixed. According to the utility model, through the combination of the monitoring mechanism and the monitoring camera, the real-time monitoring of the settlement condition of the sluice base can be realized, continuous image data can be provided, the settlement height of the foundation can be analyzed and recorded conveniently, and when the settlement of the base exceeds a set threshold value, the buzzer gives an alarm sound to remind related personnel to take measures in time, so that the working efficiency is improved. The safety is ensured.

The invention belongs to the technical field of building construction, and discloses a construction dust falling device which comprises a shell and further comprises a protective cover and a middle shaft which are fixedly connected to the top of the shell and the interior of a cavity correspondingly, a spray head assembly is arranged in the shell, and a conveying pipe assembly for conveying water into the spray head assembly is arranged at the bottom of the shell; a direction adjusting mechanism capable of reversely adjusting the spraying direction of the spray head assembly along with the wind direction is installed on the protective cover. According to the scheme, a water source is guided into the spray head body through the conveying pipe assembly and sprayed outwards from the end of the spray head body, so that when the device encounters airflow, the blades can deflect with the spherical part of the sleeve rod as the axis, for example, when the spray head assembly deflects with the middle shaft as the axis, the flow baffles can abut against the corresponding supporting arc plates and make the supporting arc plates deflect, and the airflow is sprayed outwards from the end of the spray head body. And at the moment, the nozzle body can spray a farther distance to resist airflow, so that the effective contact time of water mist and dust is prolonged.

The utility model discloses an experimental tree shrew breeding observation box with a noise reduction structure, which comprises a horizontally placed support base, a protective cover corresponding to the support base is arranged above the support base, an observation window is fixedly arranged on the outer surface of the front side of the protective cover, a lower baffle is fixedly arranged on the upper surface of the support base, and a noise reduction structure is arranged on the lower baffle. The lower end of the protective cover and the lower baffle are mutually clamped, a ventilation net is fixedly installed on the surface of the front side of the lower baffle, a feeder and a water feeding trough which are fixedly installed on the supporting base are arranged on the inner side of the lower baffle, and a light supplementing lamp is fixedly installed on the inner wall of the upper end of the protective cover. According to the experimental tree shrew breeding observation box with the silencing structure, a novel structural design is adopted, air is conveyed into the movable box through an air inlet pump by utilizing a connecting pipe, the air is heated by utilizing an electric heater in the movable box and then conveyed into a protective cover, and the purpose of adjusting the temperature is achieved by matching with a temperature sensor; therefore, different environment conditions can be simulated.

The utility model discloses a pneumatic rotary water dirt removal dental mouth mirror, and belongs to the technical field of dental auxiliary instruments. The protective frame is fixed with one end of the handle, the top side of the protective frame is an opening, and the peripheral side is provided with an air inlet; the protective cover is rotationally connected in the protective frame, a sealing cavity is formed in the protective cover, and one side, facing an opening of the protective frame, of the protective cover is of a transparent structure; the mirror surface is coaxially arranged in the sealing cavity and fixed with the protection frame, the mirror surface faces the opening and is parallel to the transparent structure, and a working gap is reserved between the mirror surface and the transparent structure; the peripheral side of the protective cover right faces the air inlet, and when airflow enters the air inlet, the protective cover can rotate. Dynamic waterproof and antifouling effects are achieved through the synergistic effect of centrifugal force and airflow, liquid is effectively prevented from accumulating, flowing or forming a water film on the transparent baffle, and therefore high light transmission and definition of the transparent baffle are maintained to the maximum extent.

The present invention relates to the technical field of regulating and storage tanks, and discloses an automatic lifting bird-proofing device for regulating and storage tanks and a method for using the device. The device comprises a bird-proofing assembly, comprising: a mounting frame provided on the inner side of the reservoir; a protective cover provided on the top of the mounting frame; a bottom frame provided on the bottom of the mounting frame; through slots symmetrically provided on the top of the bottom frame; a filter hinged on the inner side of the through slots; a collection frame symmetrically provided on the bottom of the bottom frame, and a lifting assembly for lifting the protective cover to collect impurities dropped during the lifting process into the collection frame. The present invention can solve the problem that existing regulating and storage tank bird-proofing devices are inconvenient for cleaning algae or duckweed.

The invention discloses a novel automatic steel pipe cutting device and process. The novel automatic steel pipe cutting device comprises a supporting bottom plate, and a supporting column is arranged at the top of the supporting bottom plate; a lifting frame is vertically and movably arranged on the lifting seat, a first motor is horizontally arranged on the lifting frame, and a saw blade is arranged on an output shaft of the first motor; the first driving mechanism is used for driving the lifting frame to lift; the protective cover is fixedly arranged on the side portion of the lifting base, and a protective groove is formed in the bottom of the protective cover. The pressing shell is connected with the protective cover, and the cross section of an inner cavity of the pressing shell is rectangular; the side wall of the pressing base is movably attached to the inner wall of the pressing shell, a first elastic piece is arranged between the top of the pressing base and the top of the inner wall of the pressing shell, a pressing body is vertically arranged at the bottom of the pressing base, a pressing piece is arranged at the bottom of the pressing body, and when the saw blade cuts a steel pipe located on the two supporting columns, the pressing piece abuts against the top of the steel pipe, and the steel pipe is pressed against the pressing piece. And the first elastic piece is in a compressed state.

The invention discloses a protective device for laboratory experiments, which comprises a shell, a motor is connected to the bottom in the shell, a rotating plate is connected to the upper side of an output shaft of the motor, the rotating plate divides the shell into a laboratory and a mounting cavity, a partition plate is connected to the rotating plate, and the laboratory is divided into a dangerous laboratory and a common laboratory by the partition plate. A first protective cover is connected to an opening of the dangerous laboratory, two operation openings are formed in the first protective cover, and an isolation operation piece is connected to the inner side of each operation opening in a sliding mode. The protective device has the advantages that the rotating plate is driven by the motor to rotate, a dangerous laboratory and a common laboratory can be switched according to the dangerous degree of an experiment, the occupied space of equipment can be reduced, the purchase cost of the equipment can be reduced, multiple purposes are achieved, and when the experiment is carried out through the dangerous laboratory, the experiment efficiency is improved. The outside can be isolated, and operators are prevented from being dangerous by experiments.

The utility model relates to the technical field of gravity type retaining walls, in particular to a gravity type retaining wall structure which comprises a wall body, the wall body is fixedly connected to the top of an embedded part, two tenons are fixedly connected to the bottom of the embedded part, a wall root is arranged at the bottom of the rear side of the embedded part, a guardrail is fixedly connected to the top of the wall body, and the guardrail is fixedly connected to the top of the wall body. The top of the wall root is fixedly connected with an inverted filter layer, the front side of the wall body is provided with a planting assembly and a protective cover, according to the improved retaining wall structure, the protective cover rotates with the connecting shaft as the axis, the protective cover can be opened, then the stress anchor rod is taken out of the wall body to be replaced, and the whole wall body is designed to be inclined backwards, so that the stress anchor rod can be conveniently replaced. And when the wall body is subjected to extrusion force from a rear side hillside, the direction of the extrusion force can be changed, the force direction is transmitted to the direction of the included angle between the wall body and the embedded part, the bearing force of the wall body under the structure is higher, and the borne force is dispersed to the bottom embedded part and the tenon.

The utility model relates to the technical field of protective covers, and particularly discloses a machine tool protective cover which comprises a protective door, and an observation window is arranged in the center of the front end face of the protective door. A cleaning piece is arranged at the front end of the observation window, and a water tank is fixedly mounted on the front end surface of the protective door below the observation window; a filtering assembly is arranged on the lower portion of the right end of the protective door and comprises a recycling barrel fixedly installed on the lower portion of the right end of the protective door. An RO membrane cylinder is installed in the recycling cylinder, an extrusion part is installed at the position, located at the upper end of the RO membrane cylinder, in the recycling cylinder in a sliding mode, cleaned sewage can be filtered under the cooperation of the extrusion part, the RO membrane cylinder and other structures, and due to the fact that the aperture of an RO membrane is one millionth (0.0001 micrometer) of hair and cannot be seen by naked eyes generally, in the filtering process, the diameter of the RO membrane is smaller than that of the hair, and the diameter of the RO membrane is smaller than that of the hair. Metal particles in the sewage cannot penetrate through the RO membrane, so that the filtering effect can be ensured.

The application provides a sliding wellhead protection system with ventilation function, which comprises a protection cover and a base. The protection cover comprises a protection cover top ring and a protection cover bottom ring. An exhaust unit is arranged in the protection cover top ring. A protection cover support column is connected with the protection cover top ring at the upper end and connected with the protection cover bottom ring at the lower end. The protection cover support columns are connected by a protection cover connecting rod. The front end and the rear end of the protection cover bottom ring are respectively fixed with protection cover wheel sets. The base comprises a base top ring embedded in the ground outside the shaft entrance and a base bottom ring arranged in the shaft and corresponding with the outer diameter of the shaft. A jet fan unit for generating rotating airflow is arranged at the lower side of the protection cover. The inlet of the jet fan is connected with an air inlet penetrating through the protection cover through a flexible air pipe. The protection cover is fixed by the buckle. The flying stones generated during blasting construction are blocked by the protection net. The dust can be quickly discharged by the jet fan unit and the exhaust fan, so that the construction progress is accelerated.

The utility model relates to the technical field of bearing spacer bush installation, in particular to an automatic spacer bush assembling machine with a protective structure, which comprises a moving mechanism, a protective cover is fixedly installed on the top of the moving mechanism, a first adjusting mechanism is fixedly installed on the top of the moving mechanism, and a second adjusting mechanism is fixedly installed on the inner wall of the moving mechanism. And a fixing mechanism is fixedly mounted on one side of the second adjusting mechanism, and a mounting mechanism is fixedly mounted at the top of the moving mechanism. According to the improved automatic spacer bush assembling machine, a T-shaped groove plate, a first T-shaped sliding block, a supporting plate, a first adjusting mechanism and a second adjusting mechanism are adopted, when spacer bushes and bearings are assembled, the spacer bushes can be automatically fed, and meanwhile the spacer bushes with different diameters can be automatically fed; and the fixing mechanism and the mounting mechanism are adopted, so that the spacer bushes with different diameters can be automatically clamped when the spacer bushes and the bearings are assembled, and the spacer bushes and the bearings are automatically assembled.

The utility model discloses a hardness detection device for three-way pipe body production, which comprises a detection table and a positioning mechanism connected to the detection table, the positioning mechanism comprises two pressing plates, two push-pull plates, a fixed column, a connecting block I, a connecting block II, a spring II and a spring III, the pressing plates are movably connected to the detection table, and the push-pull plates are movably connected to the detection table. The two ends of the push-pull plate are connected with the first connecting block and the corresponding pressing plates, the fixing columns are used for guiding the first connecting block and the second connecting block, the two ends of the second spring are connected with the first connecting block and the detection table, the two ends of the third spring are connected with the first connecting block and the second connecting block, and the detection table is connected with a detection mechanism. The detection mechanism is connected with a lifting mechanism used for driving the detection mechanism to ascend and descend, and the lifting mechanism is used for driving the second connecting block to move downwards. According to the utility model, the stability of the workpiece can be improved, the subsequent detection is facilitated, and meanwhile, the protective cover covers the workpiece to protect the detection area, so that the safety of hardness detection is improved.

The utility model discloses a convenient-to-disassemble protective shell for a natural gas compressor unit, which belongs to the technical field of natural gas compressor units and comprises a base, a vertical plate is connected above the base, a protective cover is slidably mounted on the base, the compressor unit is mounted above the base, limiting grooves are formed in two sides of the base, and the vertical plate is connected with the compressor unit through the limiting grooves. Guide grooves are formed in the two sides of the upper portion of the base. According to the convenient-to-disassemble protective shell for the natural gas compressor unit, a worker pulls a connecting plate to move through a pull rod to enable an inserting rod to be separated from an inserting hole and then pushes a protective cover to enable a connecting strip to slide along a guide groove to enable a roller to roll on the ground, so that the compressor unit is exposed, and the worker can conveniently overhaul and maintain the compressor unit; in the assembling process, the protective cover makes contact with the vertical plate, the spring can be compressed when the sliding rod is pulled to move upwards through the pull rod, the inserting rod is inserted into the inserting hole through springback of the spring, then the protective cover is fixed, operation is easy, and a worker can assemble and disassemble the protective cover conveniently.

The embodiment of the application provides a protective cover shed system suitable for an irregular site and a mounting method thereof, the construction site is divided into a plurality of sections according to site conditions, and two groups of supporting columns are respectively arranged in each section according to the topography of the divided section, a cantilever steel support is connected to the inner side of the top of part of the supporting columns, so that the inner side of the top of a plurality of supporting columns in the same group can be located on the same horizontal straight line, a straight line sliding rail is mounted, and two straight line sliding rails are relatively parallel, so that the opening and closing requirements of the dust screen are met. In other words, the application can reasonably arrange the supporting mechanism according to the site conditions, ensure that the dust screen can normally open and close in the case of an irregular site, and meet the covering requirements of the irregular site.

The invention discloses a gas detection port protective cover and a gas detection device, and relates to the technical field of gas detection. The device mainly comprises a sleeve, a filter box, positioning mechanisms and a gas detector, the sleeve movably sleeves a gas inlet pipe orifice of the gas detector, the filter box is fixed at the other end of the sleeve and is used for filtering dust and moisture, the number of the positioning mechanisms is not less than two, and the positioning mechanisms are uniformly distributed on the sleeve. The positioning mechanism comprises a mounting box inserted in the sleeve, a mounting frame is movably arranged in the mounting box, a roller is rotatably mounted on the mounting frame, a first spring is connected between the mounting frame and the inner wall of the mounting box, and the positioning mechanism further comprises a fixing part arranged in the mounting box and used for fixing the roller. The gas detection device is convenient to mount and dismount, the dismounting of the protective cover needs certain operation, the anti-theft performance is improved, dust and moisture in the environment are effectively intercepted and absorbed through the design of the absorbent cotton and the filter plate, and the gas detection accuracy is improved.

The utility model discloses a split external control type loom console housing assembly, which belongs to the technical field of protective housings and comprises a left housing assembly and a right housing assembly. The left side housing assembly comprises a left front housing part and the like; the right side housing assembly comprises a right front housing part and the like; the left front housing part comprises a left front housing A and a left front housing B; the left side housing assembly is detachably mounted on the loom console only through the left front housing A; the control panel and the left front housing part are detachably mounted only through the left front housing B; the right front housing part comprises a right front housing A and a right front housing B; the right housing assembly is detachably mounted on the loom console only through the right front housing A; and the button seat is detachably mounted with the right front housing part only through the right front housing B. According to the utility model, the left front housing part and the right front housing part are connected in a split manner, so that when the housing is damaged due to disassembly, only the corresponding damaged part needs to be replaced, and the later maintenance cost is lower.

The utility model relates to the technical field of underground water level observation, and discloses a hydrogeological exploration underground water level observation device which comprises a water level gauge body and a mounting frame connected to the outer wall of the water level gauge body. According to the water level gauge, the protective cover is arranged on the water level gauge body, the water level gauge body which is not used can be protected by the protective cover, the elastic cushion layer is arranged on the inner side of the protective cover, impact force generated when the protective cover is collided can be effectively absorbed, damage is effectively avoided, and the water level gauge body cannot be accidentally collided and damaged when being carried outdoors; the protective cover is rotationally connected, when the water level gauge body is used, opening and closing can be achieved only in a rotating mode, and operation is easy and practical.

The invention relates to the technical field of medical equipment, and discloses a slicing device for molecular pathology experiments. The cutting table is arranged on the base, and a cutter is arranged on the cutting table; the protective cover is arranged on the base, a first sliding groove is formed in the protective cover, a first sliding block is arranged in the first sliding groove in a sliding fit mode, a first bearing seat is arranged on the first sliding block, a main rod is rotationally matched with the first bearing seat, the first bearing seat does not limit the axial displacement of the main rod, a mounting head is arranged at one end of the main rod, and a wax block is mounted on the mounting head; the main driving mechanism is used for driving the first sliding block to slide back and forth in the first direction. The first driven mechanism is used for driving the main rod to rotate axially when the main rod moves along with the first sliding block; the second driven mechanism is used for driving the main rod to move in the second direction after the main rod reciprocates for one cycle in the first direction, low-loss and high-integrity cutting can be achieved, and the automatic and accurate feeding function is integrated.

The present application relates to the technical field of soil remediation, and particularly discloses a decontamination and separation device and method for uranium-containing contaminated soil based on chemical leaching, which comprises a separation device shell, an inlet cylinder for feeding is arranged in the separation device shell, a leaching liquid mixing box for leaching of the uranium-containing contaminated soil is arranged at the rear side of the inlet cylinder, a turnover plate for digging of the uranium-containing contaminated soil is installed at the front side of the inlet cylinder, a moving wheel for walking is installed at the bottom of the separation device shell, and a protective cover for shielding of the soil is fixed at the front side of the separation device shell. When the turnover plate moves counterclockwise, the soil is scattered by separation teeth, when the turnover plate rotates clockwise, the scattered soil is dug out and thrown to an inlet inclined plate and then enters the inlet cylinder, and the soil is fed by spiral blades in the inlet cylinder, so that the soil does not need to be manually dug, the digging and feeding can be simultaneously performed, and the work efficiency is improved.

The monitoring device comprises the cutter and a fixing block, the fixing block is located on the outer surface of the upper end of the cutter, limiting holes are formed in the left side and the right side of the outer surface of the upper end of the cutter, and first threaded holes are formed in the upper portions of the outer surfaces of the two sides of the cutter. Anti-loosening assemblies are mounted on the left side and the right side of the outer surface of the upper end of the fixing block, each anti-loosening assembly comprises a sliding hole, a movable shaft, a limiting block, a protective cover and a belleville spring, mounting blocks are fixedly mounted at the four corners of the outer surface of the lower end of the fixing block, and second threaded holes are formed in the upper side and the lower side of the outer surface of one side of each mounting block. Fixing bolts are arranged between the mounting blocks and the cutters, the pressure sensors are arranged, and the pressure sensors are externally connected with a controller, so that a load change curve of each cutter, a standard curve obtained through sampling and a combined judgment line can be displayed in real time; and the real-time load change trend of the cutter in the cutting process can be completely checked, and timely alarm can be given when problems occur.

The utility model relates to the technical field of thread machining, and discloses a tapping device for threaded rod machining, which comprises a fixing frame and a support, the support is fixedly installed on the fixing frame close to the back face, the top of the inner wall of the support is slidably connected with a sliding block, the bottom end of the sliding block is fixedly provided with an air cylinder, and the bottom end of the air cylinder is fixedly provided with a protective cover plate. A cutter base is fixedly installed at the bottom end of the protective cover plate, by arranging the protective cover plate and a folding mechanism, chips possibly bursting out in the tapping process can be blocked by the protective cover plate and a folding baffle to fall into a collecting box, the situation that the chips burst out to the equipment and injure workers is avoided, and therefore the purposes of reducing the subsequent cleaning difficulty of the workers and improving the working efficiency are achieved. The small tapping equipment has the beneficial effects that the safety during equipment operation is improved, and the problems that an existing small tapping equipment does not have a protection structure when tapping a threaded rod, so that chips burst out during tapping splash everywhere, personnel are easily injured, and the follow-up personnel cleaning difficulty is large are solved.

The application relates to the technical field of flood-preventing water pumps, in particular to a flood-preventing water pump with intelligent height adjustment and a control method thereof. The application comprises a mounting seat, the bottom of the mounting seat is fixedly connected with a protective cover, the bottom of the mounting seat is liftly installed with a submersible pump body, the bottom of the submersible pump body is fixedly connected with an impeller bin, the two sides of the impeller bin are respectively connected with a water inlet pipe and a water outlet pipe, and the water inlet pipe is connected with a filter assembly and an external pipe. Through the arrangement of the water inlet pipe, the filter assembly and the external pipe, the use range of the device can be effectively improved. When the device is used for drainage work on deep water surfaces such as rivers and reservoirs, impurities such as waterweeds often exist in the device. The filter assembly can effectively prevent the waterweeds from adhering to the outside of the submersible pump body, so that the heat dissipation efficiency of the submersible pump body is prevented from being reduced.

The utility model discloses a mixing mechanism for a ground spreading and airing machine. The mixing mechanism comprises two symmetrical wallboards, sliding plates are connected to the two wallboards in a sliding mode, bearing seats are fixedly connected to the two sliding plates, a transmission shaft is rotationally connected into the two bearing seats, and a first driving mechanism for driving the transmission shaft to rotate is installed on one bearing seat. A plurality of first bevel gears are connected to the transmission shaft, a plurality of bearing sleeves with the same number as the first bevel gears are connected to the bottom of the protective cover, a mixing unit is rotationally connected into each bearing sleeve, a second bevel gear is connected to the upper end of each mixing unit, and the second bevel gears are meshed with the corresponding first bevel gears; and second driving mechanisms which are used for supporting the sliding plates and can drive the sliding plates to slide in the sliding holes are arranged on the two wallboards. The first driving mechanism works to drive the transmission shaft to rotate, so that all the mixing units are driven to work at the same time, mixing operation is achieved, manual mixing is not needed, and the effect is greatly improved.

The utility model discloses a protection device of lightning protection grounding detection equipment, which comprises a detection equipment box, the detection equipment box is provided with a protection assembly, the protection assembly comprises a protection cover plate, an observation window, a button, an adjusting hole and a sealing gasket, the protection cover plate is detachably installed on the detection equipment box, and the observation window is detachably installed on the detection equipment box. The observation window is arranged on the protective cover plate, the keys are uniformly arranged on the protective cover plate, the adjusting holes are formed in one sides of the keys, the sealing gasket is arranged on one side of the protective cover plate, the sealing gasket is attached to one end of the detection equipment box, and a relieving assembly is arranged between the detection equipment box and the protective cover plate through a fixing assembly. The removing assembly comprises fixing rods, mounting sleeves and moving sleeves, and the fixing rods are fixedly mounted at the four corners of the detection equipment box, so that the technical problem that in the background technology, a protection device of an existing lightning protection grounding detection device possibly has insufficient sealing performance is solved.

The utility model discloses an airflow direction adjustable axial flow fan which comprises an axial flow fan body, a protective cover is fixedly installed on the inner wall of the axial flow fan body, an assembly plate is fixedly installed at the end of the axial flow fan body, and a machining assembly is arranged on the side, away from the assembly plate, of the axial flow fan body. When the airflow direction of the axial flow fan body needs to be adjusted, adjustment is conducted through an adjusting assembly, when the airflow direction needs to be longitudinally adjusted, a first motor is started, a rotating rod fixedly installed at the output end of the first motor rotates along with the first motor, and a first gear fixedly installed at the end of the rotating rod rotates along with the first motor; due to the fact that a limiting ring fixedly installed at the end of a rotating ring is rotationally connected with the interior of a ring groove, and a gear ring is meshed with a first gear, under the limitation of the limiting ring, the rotating first gear drives the gear ring to rotate, the rotating gear ring drives the rotating ring to rotate, and the rotating ring drives an adjusting assembly fixedly installed on the side, away from the limiting ring, of the rotating ring to integrally rotate; and the airflow direction is integrally adjusted.

The utility model provides a compression-resistant firm iron box, which relates to the technical field of product packaging equipment, and comprises a box body and an iron cover, the top of the box body is fixedly connected with the iron cover through a bolt, the front end of the box body is provided with a protective assembly, and the protective assembly is provided with a protective cover. The protective assembly moves up and down and drives the protective cover to protect the upper end and the lower end of the box body, the protective cover is connected to the box body and the iron cover in a sliding mode, two sets of sliding blocks are driven by restoring force of first springs to slide in sliding grooves in a reset mode, and the sliding blocks drive the protective cover to slide on the box body and the iron cover through rotating rods. The protective cover drives the soft cushion to be attached to the box body or the iron cover, so that the purpose of protecting the upper end and the lower end of the box body is achieved, the structural strength of the box body is improved, pressure is dispersed, the impact resistance is improved, and the compression resistance of the upper end and the lower end of the box body is enhanced.

The application relates to the field of TBM (Tunnel Boring Machine) driving temporary support, in particular to a TBM temporary support extension structure and a using method thereof. In view of the problems of limited support range and low space utilization of the temporary support extension structure in the prior art, the following scheme is provided, which comprises a driving cutter head, a protective shield, a main beam, a first-stage support, a second-stage support, a first telescopic hydraulic cylinder and a second telescopic hydraulic cylinder. The first-stage support is rotationally connected with the protective shield, the second-stage support is slidably assembled on the first-stage support, the first telescopic hydraulic cylinder and the second telescopic hydraulic cylinder are cooperatively matched, the rotation of the first-stage support and the unfolding and contraction actions of the second-stage support are realized, the structure can pass through a narrow space in a contracted state, and a large-area support surface is formed after unfolding, thereby solving the problems of limited support range and poor adaptability of the traditional support. The hydraulic cylinders are cooperatively matched to realize rapid extension and positioning, the application is suitable for complex geological conditions such as mine tunnels, sufficient time is reserved for anchor support operation, and the efficiency of roadway driving is effectively improved.

A new protective cover for a support roller bearing box that is easy and quick to disassemble is characterized in that it includes a protective cover, a connecting plate, a connecting shaft hub, a pin shaft, a positioning bolt, a matching shaft hub, a mounting plate, and a fastening bolt. The protective cover is welded to a connecting plate, and the connecting plate is welded to a connecting shaft hub. A connecting hole is processed at the center position of the connecting shaft hub. A mounting plate is welded on the hub wall on one side of the matching shaft hub, and a positioning hole is processed on the hub wall on the other side. The connecting shaft hub and the matching shaft hub are concentrically matched. The pin shaft is inserted from the outside of the matching shaft hub and extends from the inside of the connecting shaft hub. A positioning bolt is installed in the positioning hole, and the positioning bolt is inserted into the positioning groove of the pin shaft. A mounting hole is processed on the mounting plate, and the protective cover is installed to the lower end of the bearing box by fastening bolts. The practical effects of the present invention are: simple structure, novel design, the cover body can be rotated to a certain angle to avoid surrounding accessories, prevent interference from accessories, improve protection, achieve quick disassembly, save maintenance time, and at the same time increase service life.

The invention relates to the technical field of laser measurement, in particular to a portable forest tree diameter at breast height and tree height rapid measuring device for forestry investigation, which comprises a first measuring frame, a second measuring frame and a protective cover, and the end wall of the first measuring frame is hinged with the end wall of the second measuring frame. According to the invention, through the arrangement of the protective cover, after the protective cover is overturned to a state that the first measuring frame is parallel to the end surface of the steering block, the protective cover is pushed, so that the pin on the protective cover is inserted into the storage lock holes in the end parts of the first measuring frame and the steering block; the first measuring frame, the second measuring frame and the steering block which are in a folded state are locked and limited, at the moment, the whole device is stored into a near cuboid shape, the occupied space of the device is greatly reduced, the device is convenient to carry by hand or bag, and the problem that an existing device is inconvenient to carry and inconvenient to carry is solved. Therefore, measuring personnel need to spend a lot of energy to carry the measuring device, and the practicability of the device is improved.