43results about How to "Prevent sand leakage" patented technology

The invention, which relates to the technical field of seepage test equipment, discloses a multifunctional test device for researching a seepage failure mechanism of an underground engineering soil body. The device comprises a main box body, a loading system, a pipeline simulation system, an adjusting system, a foundation pit supporting mechanism, a measuring system and a test system. The main boxbody is used for bearing a soil body; the loading system is used for applying a load to a soil body; the pipeline simulation system is used for simulating a pipe jacking pipeline.; the adjusting system is used for providing water for a soil body and controlling the water pressure; the foundation pit supporting mechanism is used for simulating foundation pit supporting; the measuring system is used for detecting the pressure in the loading system and observing the movement and change conditions of the soil body, and the measuring system is used for measuring the particle size and quantity of outflow sand. The invention provides a model device for researching a seepage failure mechanism caused by underground water, and the indoor model test device is used for simulating soil body stress deformation, pore water pressure change conditions and the like under the action of underground water, so that the foundation pit failure caused by underground water seepage can be better eliminated.

The invention discloses a sewage disposal system. The sewage disposal system comprises a water pump, a second filtering unit and at least a first filtering unit, wherein the first filtering unit is gravity automatic backwashing filtering unit; the second filtering unit is biological filter unit; the gravity automatic backwashing filtering unit comprises a cavity having a water inlet, a sludge outlet and a water outlet, and a filtering plate; the water inlet and sludge outlet are located under the filtering plate; the water outlet is positioned above the filtering plate; one of the first filtering unit is in flow connection with the water pump through the water inlet, and in flow connection with the biological filter unit through the water outlet; and the filtering plate comprises a 2-5 mm thick filtering layer formed by bonding silica sand and / or film covered silica sand through binder and curing. The inventive system has good sewage disposal effect, and can be widely applied in sewage treatment field.

The invention relates to the technical field of sand spreading devices for 3D printing, and relates to a vibration sand discharging device for a 3D printer and a vibration sand spreading debugging method thereof. The vibration sand discharging device for 3D printing comprises a sand hopper, and a sand bin is arranged above the sand hopper; a spiral stirring wheel is arranged in the sand bin, and the top of the sand bin is provided with a stirring wheel motor and a sand supply opening; a sand outlet with a fixed width is formed below the sand hopper in the length direction; the cross section, perpendicular to the length direction, of the sand hopper on the upper side of the sand outlet is in a V shape; a self-leakage-stopping sand discharging device is arranged in the sand hopper above thesand outlet, sliding rails are symmetrically arranged on the two outer walls of the outer side of the sand hopper in the length direction respectively, a plurality of sliding blocks are arranged on the sliding rails respectively, and a vibration air cylinder is connected to the sliding blocks; the lower side of the sand outlet is connected with a sand scraping plate. After the vibration air cylinder stops vibrating, the self-leakage-stopping sand discharging device stops sand flowing to the sand discharging opening. The sand discharging structure can be used for uniformly spreading sand in thelength direction when sand spreading is carried out, and self sand stopping can be effectively achieved after vibration is stopped.

The invention relates to a mining electric locomotive leak-proof automatic stuccoing device belonging to an electric locomotive leak-proof automatic stuccoing device. The device is mainly used for solving technical problems of sand falling and leakage of existing devices. The invention adopts a technical scheme that: the bottom plate of a sand body (1) and the top plate of a stuccoing box (5) are connected with the top of one side of a power device support plate (7); the other side of the power device support plate (7) is fixedly connected with a powder device (2); below the power device support plate (7), one side of the powder device (2) is fixedly connected with a spring (3); a powder shaft (6) connected with the power device (2) and crossing the stuccoing box (5) is surrounded on the inner side of the spring (3); the spring (3) is fixedly connected with a side plate of the stuccoing box (5); and a sealing plate (4) matching a round outlet of the top plate of the stuccoing box (5) is fixedly arranged on the power shaft (6). The device provided by the invention is mainly used in electric locomotive stuccoing.

The invention discloses a sand jet nozzle used for a cold-box core shooter. The sand jet nozzle comprises a sand jet plate and a sand outlet nozzle. A hole is formed in the middle portion of the sand jet plate. The sand outlet nozzle is installed in the hole. The sand jet nozzle is characterized in that the sand outlet nozzle is detachably installed in the hole; and a fixing part is arranged on the lower portion of the sand jet plate and can fix the height, in the hole, of the sand outlet nozzle. By means of the structure that the sand outlet nozzle can be freely detached on the sand jet plate, free replacement can be conducted for molds of different specifications, and the application range is widened; and a thread is arranged in the hole in the sand jet plate, leakproofness is greatly improved compared with a traditional technology, foundry sand is prevented from leaking at the position of the hole gap between the sand outlet nozzle and the sand jet plate, and the sand-leakage-prevention technical effect is achieved.

The invention discloses a sealed height-adjustable sand shooting mouth. The sealed height-adjustable sand shooting mouth comprises a sand shooting chamber pipe, and a sand shooting plate; the sand shooting plate is provided with a groove matching the sand shooting chamber pipe; the sand shooting chamber pipe is capable of sliding in the groove vertically; a horizontal screw hole is arranged in the sand shooting plate, and the side wall of the sand shooting chamber pipe is penetrated by the horizontal screw hole; and a fastening screw matching the horizontal screw hole is arranged in the horizontal screw hole. The structure of the sealed height-adjustable sand shooting mouth is ingenious; the fastening screw is used for fastening the sealed height-adjustable sand shooting mouth; when the height of the sealed height-adjustable sand shooting mouth should be adjusted based on the demands of users, height adjusting can be realized via unscrewing, heightening, and screwing; operation is simple and convenient; and in addition, a sealing rubber ring is arranged at an outlet of the groove of the sand shooting plate, so that sand leakage caused by loose fixing of the sand shooting chamber pipe with the sand shooting plate is avoided, wherein loose fixing of the sand shooting chamber pipe with the sand shooting plate may be caused by loss caused by frequent adjusting of the sealed height-adjustable sand shooting mouth.

The invention relates to a tube slot backfilling structure for an existing road and a construction method thereof. The tube slot backfilling structure comprises a tube slot and a pavement structure layer laid on the upper side of the tube slot, and a first packing layer and a second packing layer are backfilled in the tube slot from bottom to top in sequence. The first packing layer is foamed concrete or a mixture of domestic refuse and incineration bottom ash, and the second packing layer is the mixture of domestic refuse and incineration bottom ash. Geogrids are laid on the bottom surface ofthe base of the pavement structure layer. The tube slot backfilling structure is simple and reasonable and can avoid the sand leakage problem caused by pipe rupture. Moreover, the structure has highstrength, so that the road is less prone to longitudinal slits and subsidence and has good traffic safety.

The invention provides a 3D printer leakproof working cylinder. The 3D printer leakproof working cylinder comprises a first cylinder wall, a second cylinder wall, a first side plate, a second side plate, positioning rods and a piston plate; a rectangular channel structure is jointly defined by the first cylinder wall, the second cylinder wall, the first side plate and the second side plate; the first cylinder wall and the second cylinder wall are cooperatively connected through grooves in the first side plate and the second side plate; the first side plate and the second side plate are fastened and connected through the positioning rods; the piston plate slides in the rectangular channel; and the first cylinder wall and the second cylinder wall are made of glass or resin. The problems that3D printer working cylinders are insufficient in strength, and sand is prone to leaking are solved, the 3D printer leakproof working cylinder is convenient to dismount, mount and maintain and has good application prospects, on the basis of superior performance than original metal cutting machining, the cost is greatly reduced, the corrosion resistance is significantly improved, the especially inapplication of a large-sized piston cylinder blocks, the flatness of a whole board cannot be ensured by metal cutting machining easily, and the 3D printer leakproof working cylinder can be widely popularized in similar application.

The invention relates to a mining electric locomotive leak-proof automatic stuccoing device belonging to an electric locomotive leak-proof automatic stuccoing device. The device is mainly used for solving technical problems of sand falling and leakage of existing devices. The invention adopts a technical scheme that: the bottom plate of a sand body (1) and the top plate of a stuccoing box (5) are connected with the top of one side of a power device support plate (7); the other side of the power device support plate (7) is fixedly connected with a powder device (2); below the power device support plate (7), one side of the powder device (2) is fixedly connected with a spring (3); a powder shaft (6) connected with the power device (2) and crossing the stuccoing box (5) is surrounded on the inner side of the spring (3); the spring (3) is fixedly connected with a side plate of the stuccoing box (5); and a sealing plate (4) matching a round outlet of the top plate of the stuccoing box (5) is fixedly arranged on the power shaft (6). The device provided by the invention is mainly used in electric locomotive stuccoing.

The invention discloses a leakage-preventing compensation type reverse sand washing device and a use method. The device comprises a central tube; the outer side of the central tube is sleeved with a connecting cylinder sleeve and an outer tube part; liquid inlets are formed in the top of the outer tube part; a packer part is arranged on the outer wall of the connecting cylinder sleeve; the bottomof the central tube can be glidingly sleeved with an inner sand-guiding sliding cylinder sleeve; a conical tube part with the diameter gradually increased from top to bottom is arranged at the bottomof the inner sand-guiding sliding cylinder sleeve; a liquid spraying hole is formed in the side wall of the conical tube part in a penetrating manner; the bottom of the connecting cylinder sleeve canbe glidingly sleeved with an outer sand-guiding sliding cylinder sleeve; the bottom of the conical tube part is connected with the inner wall of the outer sand-guiding sliding cylinder sleeve in a sealed and abutted manner; and the inner sand-guiding sliding cylinder sleeve and the outer sand-guiding sliding cylinder sleeve form sand-guiding double sliding cylinder sleeves. According to the deviceand the use method, formation sand in a shaft can be washed to the ground, by the aid of the compensation design of the sand-guiding double sliding cylinder sleeves, the formation sand is in the controllable range during sand washing, a sand washing liquid is prevented from being leaked into the oil layer, and the working cycle of an oil well is prolonged.

The invention provides a 3D printer leakproof working cylinder. The 3D printer leakproof working cylinder comprises a first cylinder wall, a second cylinder wall, a first side plate, a second side plate, positioning rods and a piston plate; a rectangular channel structure is jointly defined by the first cylinder wall, the second cylinder wall, the first side plate and the second side plate; the first cylinder wall and the second cylinder wall are cooperatively connected through grooves in the first side plate and the second side plate; the first side plate and the second side plate are fastened and connected through the positioning rods; the piston plate slides in the rectangular channel; and the first cylinder wall and the second cylinder wall are made of glass or resin. The problems that3D printer working cylinders are insufficient in strength, and sand is prone to leaking are solved, the 3D printer leakproof working cylinder is convenient to dismount, mount and maintain and has good application prospects, on the basis of superior performance than original metal cutting machining, the cost is greatly reduced, the corrosion resistance is significantly improved, the especially inapplication of a large-sized piston cylinder blocks, the flatness of a whole board cannot be ensured by metal cutting machining easily, and the 3D printer leakproof working cylinder can be widely popularized in similar application.

The invention discloses a silt special bucket for a loader. The loader comprises an elongating platform, a lifting and lowering chain and a bucket box, the elongating platform is arranged on the ground, the end of the elongating platform is provided with a telescopic rod, the lifting and lowering chain is connected with the end of the telescopic rod, the bucket box is arranged below the lifting and lowering chain, the bucket box can be driven by the lifting and lowering chain to extend into a river coarse, the bucket box is internally provided with a bucket device, the bucket device is used for excavating silt in the river coarse, the bucket box is of a cubic structure with a sealed upper end and an opened lower end, the bucket box is internally provided with an inner housing, a central rod, the inner housing is of a cubic structure, the upper end of the inner housing is sealed, the lower end is opened, the lower opening area of the inner housing is greater than the upper end sealing area of the inner housing, guiding grooves are formed in the four side faces of the inner housing, the guiding directions of the guiding grooves are obliquely downwards along the side face of the inner housing, and the bucket device is installed in the bucket box.

The invention discloses a sand shooting device of a cold core box core shooting machine. The sand shooting device comprises the cold core box core shooting machine and a die, wherein the cold core box core shooting machine comprises a core shooting machine body, a sand shooting cylinder and a sand shooting outlet part, the sand shooting outlet part is provided with transverse hole in the bottom-end lateral side, the die is provided with a horizontal sand inlet and a vertical hole capable of accommodating the sand shooting outlet part, and the horizontal sand inlet is connected with the bottom-end lateral hole of the sand shooting outlet part. The sand shooting device has the advantages that the casting sand direction during sand shooting is changed from a traditional vertical direction into a horizontal direction, insufficient sand shooting caused by the blocking of the sand shooting outlet part in the vertical direction can be avoided effectively, sand leakage due to the gravity of the casting sand when the sand shooting outlet part is inserted into of taken out of the die can be avoided at the same time, and the sand shoot structure is little in die scouring abrasion and beneficial to die inner frame filling.

In view of the problem that the oil content, suspended solid content, salt content and organic matter content of the steel industry wastewater are high, a combined process involving a grid, an oil separation grit chamber, a primary sedimentation tank, a biological contact oxidation tank, an efficient sedimentation tank, a V-shaped filter tank, an ultraviolet disinfection tank, a siphon filter tank, ultrafiltration and two-stage reverse osmosis is adopted, so that pollutants in the wastewater can be effectively degraded, the wastewater reuse rate can be increased, the use amount of new water inthe iron and steel industry is reduced, the investment cost of an enterprise is saved, and remarkable environmental benefits and economic benefits are achieved.

The invention discloses an MICP solidified calcareous sand bidirectional grouting cylindrical sample preparation instrument. The sample preparation instrument comprises a slurry placing vessel, a peristaltic pump, an upper grouting pipe, a lower grouting pipe, a T-shaped rubber joint, a rubber plug, a composite plug, a hoop and a double-valve type glass tube. The whole grouting process of the sample preparation instrument is controllable, for quantitative grouting, the switch peristaltic pump can be used for meeting related stipulations of standing time after one kind of slurry is injected, and the slurry can be freely replaced in the slurry placing vessel; for non-quantitative grouting, when pores of the calcareous sand sample are completely filled and grouting cannot be continued, the peristaltic pump is turned off, and grouting is stopped. The MICP solidified calcareous sand bidirectional grouting cylindrical sample preparation instrument is a technological innovation, in-situ MICPreinforcement of calcareous sand triaxial samples is achieved through undisturbed bidirectional grouting of calcareous sand cylindrical samples, the whole grouting process is visible and controllable,the sample preparation efficiency is high, and the integrity is high.

The invention discloses a building sand screening device facilitating feeding. The building sand screening device comprises a sand screening roller, two sets of clamping rings are arranged on the sandscreening roller in bilateral symmetry and sleeving manners, a ball bearing is arranged between the inner wall faces of the clamping rings and the outer wall face of the sand screening roller, the tops of the clamping rings are connected to a connecting plate, a rotary disc is arranged in the center of the upper surface of the connecting plate, a hinge block is welded to the center of the top ofthe rotary disc, the top end of the hinge block is provided with a connecting rod through hinged connection, a top plate is arranged above the ball bearing, the upper end of the connecting rod is connected to the top plate, a feeding hopper is inserted into the front end of the top plate, the left and right sides of the ball bearing are symmetrically sleeved with two sets of side connecting rings,a fixed cabin door is installed on the side connecting ring on the right side through a bolt, a sliding cabin door is arranged on the left side of the ball bearing, and six sets of sliding columns connected to the sliding cabin door are installed on the side connecting ring on the left side in a penetrating manner.

The invention discloses a heat-insulating energy-saving building block utilizing industrial waste. The heat-insulating energy-saving building block is composed of a base material 1, a blind hole 2, a blind hole 3 and a through hole 4, and the base material is composed of the industrial waste such as furnace slag and pulverized coal ash, building waste and cement according to a certain proportion and produced through hydraulic forming. Mechanical performance, heat insulativity, material consumption and building convenience of the building block are integrated, and optimized hole ratio is 45-60%. Internal hole type is optimized by reasonably matching the blind holes with the through hole, so that the heat path is enabled to be more uniform, cold-heat bridge during heat transfer of the building block is blocked, and heat insulativity of the building block is improved greatly. The building block can serve as a hollow building bock to be used solely and can be composited with a heat-insulating material for use, so that heat insulativity of the building block is further improved. The heat-insulating material which is filled can be an inorganic material such as foamed concrete and can also be an organic material such as EPS and XPS, and energy-saving designing standard requirements can be met without taking other heat-insulating measures on a built wall. The heat-insulating energy-saving building block has the advantages of high heat insulativity, building material saving, high mechanical strength, service life identical with a building and convenience in construction.

The invention provides a gravity-type automatic back-flushing filter apparatus. It is characterized in that the gravity-type automatic back-flushing filter apparatus comprises a cavity, and a filter plate, which is arranged in the cavity and separates the cavity into an upper part and a lower part. The cavity comprises a water inlet, a sludge outlet, and water outlet. The water inlet and the sludge outlet are arranged below the filter plate. The water outlet is arranged above the filter plate. The filter plate comprises a filter layer formed by curing silica sand and / or coated silica sand with a binder. The filter layer has a thickness of 2-5 mm. The inventive gravity-type automatic back-flushing filter apparatus can be easily cleaned during the back-flushing process, and is suitable for long-period use. Compared with the filter layer formed by natural piling of bulk sand, the filter layer according to the invention has lower silica sand consumption and better filtration quality, and no sand leakage during back-flushing. The gravity-type automatic back-flushing filter apparatus can be used in the fields of domestic wastewater treatment and micro-polluted water source treatment.

The invention discloses a sand screening device for construction which is convenient for loading materials. Ball bearings are arranged between the walls, and the tops of the clamping rings are all connected to the connecting plate, and a turntable is arranged in the center of the upper surface of the connecting plate, and a hinge block is welded in the center of the top of the turntable, and the top of the hinge block is connected by a hinge. A connecting rod, a top plate is arranged above the ball bearing, and the upper end of the connecting rod is connected to the top plate, a feeding funnel is arranged on the front end of the top plate, and two sets of side connecting rings are arranged symmetrically on the left and right sides of the ball bearing, And the side connecting ring on the right side is equipped with a fixed door through bolts, the ball bearing is provided with a sliding door on the left side, and the side connecting ring on the left side is inserted with six sets of sliding columns connected to the sliding door .

The invention relates to a flexible positioning wear-less vibrating sand filling device for fuse protectors. The flexible positioning wear-less vibrating sand filling device comprises a vertical variable-frequency vibrator, a support, a prepressed track type sand filling valve component, a flexible compression positioning component, a flexible sand filling nozzle component, a sand filling cylinder, a sand filling sensor component, a multi-station turn plate and a vibrator power switch. The vertical variable-frequency vibrator is arranged on the multi-station turn plate, the support is arranged on the vertical variable-frequency vibrator, the prepressed track type sand filling valve component, the flexible compression positioning component and the flexible sand filling nozzle component are arranged on a cylinder movable seat of the sand filling cylinder, the cylinder movable seat is arranged on the support, the sand filling sensor component is arranged on the vertical variable-frequency vibrator and corresponds to the flexible sand filling nozzle component, and fuse protectors are arranged on a fuse protector support on the vertical variable-frequency vibrator. Compared with the prior art, the flexible positioning wear-less vibrating sand filling device for the fuse protectors has the advantages of small wear to workpieces, rapidness, convenience, high efficiency and the like.

The invention relates to a check valve sand supply device of a sand ejector. The check valve sand supply device comprises a sand hopper, a valve body, an upper valve seat, a lower valve seat, a box body, an iron box, a pneumatic switch, a first conveying air pipe and a second conveying air pipe, wherein a hollow valve cavity is formed in the valve body, a limiting plate is arranged in the valve cavity, the limiting plate is provided with a circular ball valve, the upper valve seat and the lower valve seat are respectively provided with a sand flow hole, the sand hopper is fixed on the upper valve seat, the bottom of the sand hopper is provided with a sand inlet, the box body is fixed below the lower valve seat, a sand ejection passage is formed in the box body, the first conveying air pipe is connected and communicated with the sand ejection passage, the second conveying air pipe is connected and communicated with the bottom of the valve cavity, and the iron box is arranged below the box body. According to the check valve sand supply device, the circular ball valve is controlled by a pneumatic device to be switched on or off, the accurate reciprocating work state of a valve core is guaranteed, the valve core is relatively reliable to reset, the malfunction rate of the check valve is greatly reduced, the reliability of the check valve is improved, the sand leakage defect of a traditional plugboard sand supply device can be solved, and the operating environment can be greatly improved.

A flood drainage system blockage structure with an underground spring water and tailing seeping water drainage function comprises an upstream blockage structure and a downstream blockage structure. The upstream blockage structure comprises a chute, gaps are reserved between cover plates of the chute, the gaps are filled with non-woven geotechnical cloth I, and a concrete block is arranged at the inlet section of the chute. The downstream blockage structure comprises a culvert pipe, a concrete retaining wall is arranged at the outlet end of the culvert pipe, a concrete cover plate is arranged above the concrete retaining wall, a cement mortar plastering layer is arranged on one side face of the upstream side of the concrete retaining wall, and the concrete retaining wall is provided with an observation hole, an overflow hole and a sand washing hole; a grit chamber is arranged on the upstream side of the concrete retaining wall, a water passing area is located on the grit chamber, a concrete bottom plate is arranged at the bottom of the grit chamber, and the upper surface of the concrete bottom plate is a bevel. A second geotechnical cloth plug is arranged in the overflow hole, and a first geotechnical cloth plug is arranged at the inlet end of the sand washing hole. According to the flood drainage system blockage structure, flood cannot pass, but underground spring water and tailing seeping water can pass, no sand is leaked, construction quantity is small, cost is low, and construction period scheduling is flexible.

The invention relates to an energy-saving and environment-friendly monitoring equipment based on underground water investigation. The energy-saving and environment-friendly monitoring equipment comprises a floating block and a sampling assembly, a liquid level sensor is installed at the right end of the floating block, sealing assemblies are installed on the front side and the rear side of a first counterweight balance assembly, and water flow velocity detection assemblies are arranged on the front side and the rear side of the floating block. The sampling assembly is located at the lower end of the floating block, a control assembly is arranged on the left side of the sampling assembly, and a lifting adjusting assembly is arranged on the left side of the floating block. The energy-saving and environment-friendly monitoring equipment based on underground water investigation has the beneficial effects that the energy-saving and environment-friendly monitoring equipment based on underground water investigation has a counterweight adjusting function and an accurate flow velocity detection function, and can stably stay at a specified position of a water surface, so that the accurate detection of the equipment can be improved, water at different depths can be sampled when the equipment is used for sampling, meanwhile, water at other depths can be prevented from polluting sampled water, and whether the equipment reaches the bottom of underground water or not can be accurately detected during depth measuring of the equipment.

The invention discloses an environment-friendly muck truck with a self-locking cargo bucket. The environment-friendly muck truck comprises a truck head, a truck bottom and a bucket, wherein the truckhead and the cargo bucket are both located at the top of the truck bottom; a plurality of wheels I and wheels II are arranged at the bottom of the truck bottom; a jack is arranged between the top of the truck bottom and the top of the cargo bucket; the jack is located at the bottom of the side, close to the truck head, of the cargo bucket; a protection device is arranged on one side, far away fromthe truck head, of the jack; movable supporting plates are arranged on the two sides of the truck bottom; the movable supporting plates are fixedly connected with the two sides of the truck bottom through first pins; a first rotating shaft is arranged at the bottom of the side, away from the truck head, of the cargo bucket; the first rotating shaft is fixedly connected with the bottom of the cargo bucket through a fixing plate; and the first rotating shaft is fixedly connected with a bearing pedestal arranged at the truck bottom and away from one end of the truck head. The beneficial effect is that the problems of overload and automatic discharging are effectively solved.

The invention relates to the technical field of metal and non-metal mine tailing pond flood drainage systems, in particular to a tailing pond transition flood drainage method and system. The tailing pond transition flood drainage system comprises a reinforced concrete well seat, a prefabricated arc-shaped steel plate with a groove, an I-shaped steel stand column and a shaft; the reinforced concrete well seat is connected with a lower horizontal drainage pipe, the prefabricated arc-shaped steel plate is embedded in the reinforced concrete well seat, and the I-shaped steel stand column penetrates through the groove of the prefabricated arc-shaped steel plate and is embedded into the reinforced concrete well seat; the shaft is formed by sequentially splicing and stacking arc-shaped steel arch rings up and down, and the arc-shaped steel arch rings are formed by splicing arc-shaped steel arch plates left and right. Compared with the prior art, the tailing pond transition flood drainage method and system have the beneficial effects that operation is easy, the system can be rapidly built and put into use in a short time, and flood control safety of a tailing pond is guaranteed.

The invention relates to the technical field of sanding, in particular to a grinding device and sanding equipment. The technical problem that in the prior art, the sanding force of a manual sanding machine cannot be effectively controlled is solved. The grinding device comprises a grinding mechanism and a pressure control mechanism, wherein the grinding mechanism is used for performing grinding operation on a to-be-ground surface; and the pressure control mechanism is connected with the grinding mechanism and comprises a compression spring, and the compression spring is pre-compressed for a distance of travel so as to make the grinding mechanism always have the elastic force for flexibly adjusting the sanding force. By means of the technical scheme provided by the invention, the sanding force can be automatically adjusted according to the unevenness and the depth of the to-be-sanded surface, and the problem of sanding omission and excessive sanding is effectively avoided.

The invention provides an environmentally-friendly sand and stone separation device for large-scale sand and soil loading, and relates to the technical field of sand and soil loading devices. The environmentally-friendly sand and stone separation device is aimed at solving the problems that excavators are directly used by most of existing large-scale sand and soil loading devices for direct loading, but usually loaded sand needs to be screened to avoid mixing with stones, and pre-screening requires one process, and thus, manpower, material resources and time are wasted; existing loading devices on the market are mostly like the loading devices in the above patents, additional loading tools are needed for transporting the sand to the loading devices, and thus, the wasting of one process iscaused; and the existing devices are difficult to disassemble and transport, and are difficult to adapt to the changing environment of the transportation site. The environmentally-friendly sand and stone separation device comprises vertical frames which are mutually parallel and are vertically placed on the ground. As filtering transverse columns are uniformly arranged on a separation screen at intervals, the device is convenient to transfer for use, the step of separately screening sand before loading is saved, and material resources and manpower are saved.

The invention discloses a combined sample preparation device and method for microbial batch reinforcement of sandy soil, and belongs to the field of calcareous sand foundation reinforcement. The device includes a cementing curing box, the cementing curing box is provided with an interlayer water tank, and a temperature-controllable heater and a circulating water pump are arranged inside the interlayer water tank; the sand-loading mold combination placed in the cementing curing box includes a soft plastic pipe , the outer wall of the soft plastic tube is wound with gauze, the upper and lower openings of the soft plastic tube are open, and the side walls are open with air holes; and filter paper and permeable stones are sequentially covered on the upper and lower openings of the soft plastic tube. The method of the invention utilizes the mineralization of the microbial bacteria liquid to cement the sand, and effectively reinforces the sand through a set of solidifying sample preparation devices designed. soil test pieces. The sample preparation device and method of the invention greatly improves the sample preparation efficiency and the uniformity of the cemented samples, and also significantly reduces the differences between different samples, so as to meet the requirements of test repeatability and multiple samples.