32results about How to "Improve suction and discharge" patented technology

The invention provides a carbon canister configuration structure of a riding type vehicle. When a carbon canister is configured near a combustion tank, the tubing of a carbon canister is controlled to be the shortest. The carbon canister configuration structure comprises a fuel tank (10) arranged on a vehicle frame (4), and a fuel tank protection cover (80L) covered at the front side portion of the fuel tank (10). The fuel tank protection cover (80L) protrudes out of the width direction of a vehicle and the lower end of the fuel tank protection cover (80L) extends to the a position lower than the lower end of the fuel tank (10). A carbon canister for accumulating evaporated fuel from the fuel tank (10) is arranged at the inner side at the vehicle width direction of the fuel tank protection cover (80L). The carbon canister (55) is cylindrical, and axis (C2) of the carbon canister (55) is in line with the vertical direction of a vehicle.

The invention relates to a vacuum toilet bowl drainage apparatus, mainly solving the technical problems of pneumatic controled toilet in flushing and drainage functions; the adopted technical proposal is that a resetting component which is connected with an executive device is positioned on the cylinder body of a starting device of the drainage apparatus, the rear end of a push rod of the executive device of the drainage apparatus is provided with a restoring force regulation component; a reset spring is arranged inside the gas chamber L of a flushing valve of the drainage apparatus and the gas chamber L is communicated with atmosphere, the spring props against the casing and a diaphragm piston of the valve component; the vacuum toilet bowl drainage apparatus is applicable to various vacuum toilet bowls.

The invention relates to a no-outer-cover type range hood with randomly-adjusted orientation, comprising a fan shell with air inlets and an exhaust port, wherein a fan is arranged in the fan shell; the air exhaust outlet at the side edge of the fan shell is connected with an exhaust pipeline; a control system is also arranged under the fan shell which is arranged between a ceiling and a top wall; a connecting pipe is arranged at the air inlet under the fan shell and is connected with an air suctioning pipe after passing through the ceiling downwards; the side wall of the air suctioning pipe is provided with a plurality of oil-smoke suctioning holes; an oil cup is arranged under the air suctioning pipe; and the bottom part of the fan shell is provided with the air inlets which have the same quantity with cooking ranges. In the no-outer-cover type range hood, the pioneering no-outer-cover structure is adopted, so that not only is the space of a kitchen saved, but also the manufacturing cost of the range hood is greatly reduced. Due to random adjustment of the oil-smoke suctioning orientation, the no-outer-cover type range hood is beneficial to suctioning and exhausting oil smoke, has the advantages of simple structure, convenience in installation and use, small volume, low noise and high oil-smoke suctioning rate, and is worth of being vigorously popularized.

The invention relates to a public toilet health air intelligentizing method and system. The method and system aim at solving the problem that efficiency is low and the effect is poor in the prior art. NH3 probes, H2S probes and local suction and exhaust air ports are arranged in toilet stools or beside the toilet stools or in toilet stool regions and used for detection, suction and exhaust of foul air beside the toilet stools or in the toilet stool regions, the local suction and exhaust air ports are provided with local suction and exhaust mechanisms capable of sucking and exhausting the foul air sucked by the local suction and exhaust air ports outdoors, the local suction and exhaust mechanisms are controlled by a central intelligent control system provided with a multimedia displayer for broadcasting the air quality in a toilet, and the intelligent control system starts or stops the local suction and exhaust mechanisms arranged on the probes to stop sucking or exhausting air according to detected data of the NH3 probes and the H2S probes. The public toilet health air intelligentizing method and system have the advantages that suction and exhaust are accurately positioned, manual operation and guard are not needed, ineffective work is avoided, the suction and exhaust effect is good, toilet air quality monitoring is user-friendly, energy consumption low, efficiency is high, the air quality in the toilet is guaranteed all the time, a user can pee and defecate at ease and joyfully due to multimedia play, and the pee and defecation environment can be remarkably optimized.

The invention provides a circulating cooling micro core drill bit, which comprises a drill body, a blade arranged on the drill body and a core hole arranged at the end of the drill body, and at least one coring hole is arranged in the drill body. Coring passage communicated, the drill body is also provided with a circulating cooling passage and a cooling device connected with the coring passage, the circulating cooling passage includes an output passage and a suction passage, and the cooling device includes a stretching cylinder and a driving extension filled with cooling liquid. The hydraulic cylinder compressed by the pressure cylinder is provided with an output port and an output valve corresponding to the output channel and a suction port and a suction valve corresponding to the suction channel in the stretching cylinder, and the cooling liquid in the stretching cylinder flows in through the output channel To the coring channel, and then return to the stretching cylinder through the suction channel. By implementing the technical solution, it is possible to effectively absorb a large amount of heat generated during the drilling process of the drill bit, reduce the heat load of the drill bit, and effectively improve the integrity and core formation rate of the micro-rock core to form a standard micro-rock core.

Present invention relates to a lower air draft type fume exhauster. It mainly includes casing, cylindrical shaped enclosed board, fume exhausting cavity formed by above-mentioned casing and enclosed board, upper cover board, fume suction and exhausting opening distributed on fume diffusing surface circumference. It solves current exhauster low effect and high energy consumption problem, used in kitchen cooking utensils.

The invention relates to a thrombus dredging system for blood vessels, and relates to the technical field of medical equipment. A supporting air bag is fixedly arranged on the outer side wall of the right end of an inner tube body; a residue suction tube is arranged in the middle of an air guide main tube; the middle of the inner tube body is rotationally provided with a first rotating shaft through a bearing; the front end of the first rotating shaft is fixedly sleeved with a first driven bevel gear; the output end of a driving motor is fixedly connected with a driving bevel gear; the left side of the driving bevel gear is meshed with the first driven bevel gear; the middle of the first rotating shaft is fixedly sleeved with a knife holder; blades are symmetrically and fixedly arranged atthe front side and the rear side of the knife holder; through grooves are symmetrically formed in the upper side and the lower side of the inner tube body; and the blades are rotationally arranged inthe through grooves. The device is simple in overall operation, relatively low in production cost, few in execution mechanism and relatively small in volume, and can conveniently remove thrombus in blood vessels; meanwhile, the device can suck crushed thrombus and discharge the thrombus out of a body; and the probability of secondary thrombus is reduced.

The invention relates to a multi-wing centrifugal fan. The multi-wing centrifugal fan comprises a volute (1), an impeller (2) arranged in the volute (1), and a first motor (4) arranged in the volute (1) for driving the impeller (2) to rotate; and the volute (1) is provided with an intake port (11) and an exhaust port (12). The multi-wing centrifugal fan is characterized in that at least two guide blades (3) are arranged on the inner side of the impeller (2) in the volute (1) at intervals; the guide blades (3) are connected to a rotating shaft (6); an output shaft of a second motor (7) is in driving connection with the rotating shaft (6); the second motor (7) is connected to a bracket (5); the bracket (5) is connected to the volute (1); and the guide blades are spirally arranged corresponding to the center of the intake port (11).

The invention discloses an air box structure which comprises a box body, an air inlet assembly and a driving assembly. The air inlet assembly is vertically arranged inside the box body, the driving assembly is arranged on a top plate of the box body, and the driving assembly is connected with the air inlet assembly. The invention further discloses an extractor comprising the air box structure andhood and a kitchen range. Since the air inlet assembly is vertically arranged, air inlets changed from traditional front-back air feeding into the left-right air feeding, the two air inlets correspondto two stove heads of the kitchen range, and suction and extraction of oil smoke are facilitated. In addition, the driving assembly and the air inlet assembly are separately arranged, so that the driving assembly is prevented from affecting the area of the air inlets of the air inlet assembly, the driving assembly is separately arranged above the box body, and installation and maintenance are convenient.

The invention belongs to the field of robots, and particularly relates to an anti-winding safe sweeping robot. The sweeping robot comprises a robot body, wherein a dust suction opening is formed in a lower surface of the robot body, a horizontally-arranged brush roller is arranged in the dust suction opening, two cutting plates are arranged above the brush roller, and cutting blades are arranged at lower ends of the two cutting plates at equal intervals; a driving cavity is formed in one side of the dust suction opening, sliding rods are fixedly connected to the ends, close to the driving cavity, of the two cutting plates, the two sliding rods are arranged in a staggered mode and extend into the driving cavity, the two sliding rods are fixedly connected with the inner side wall of the driving cavity through reset springs, and a motor is arranged in the driving cavity; a shifting wheel is coaxially installed on an output shaft of the motor, and two oppositely-arranged shifting blocks are fixedly connected to the side wall of the shifting wheel. The sweeping robot is advantaged in that hair, cotton fibers and other sundries wound on the brush roller can be automatically and efficiently removed, the cleaning effect of the brush roller is guaranteed, and a problem that a motor is burnt out due to impurity winding is avoided.

The invention discloses a tunneling device for pipe jacking construction, and relates to the technical field of geological engineering. The tunneling device comprises a front cylinder, a rear cylinder, a front wall cutting assembly and a muddy water storage bin; the side part of the front wall cutting assembly is rotatably connected with the side wall of the muddy water storage bin; the tunneling device further comprises a front sealing plate, a smashing assembly, a power assembly and a water injection and discharging mechanism; a shaft pipe body rotating on the front sealing plate is arranged on the front sealing plate, the shaft pipe body is driven by the power assembly to rotate, and a spray head is arranged at the side, away from the front cylinder, of the front wall cutting assembly and communicates with the shaft pipe body; the smashing assembly is arranged on the shaft pipe body and located in the muddy water storage bin, and the smashing assembly is used for smashing mud blocks in the muddy water storage bin when the shaft pipe body rotates; and the water injection and discharging mechanism is used for sucking slurry accumulated in the muddy water storage bin and injecting water spots into the shaft pipe body. By means of the tunneling device, the structure is simple, rotary cutting of soil on the front wall is convenient, tunneling is convenient, mud is cut up and mixed into the slurry to be discharged in time, and practicability is high.

The invention belongs to the field of robots, and in particular relates to an anti-winding safe sweeping robot, which includes a body. There are two cutting boards above the top of the cutting board, the lower ends of the two cutting boards are equidistantly arranged with cutting blades, one side of the dust suction port is provided with a driving chamber, and the ends of the two cutting boards close to the driving chamber are evenly spaced. There are sliding rods fixedly connected, and the two sliding rods are arranged in a staggered manner and both extend into the driving cavity, and the two sliding rods are fixedly connected to the inner side wall of the driving cavity through a return spring, and a motor is arranged in the driving cavity, A dial is coaxially installed on the output shaft of the motor, and two oppositely arranged dials are fixedly connected to the side wall of the dial. The invention can automatically and efficiently remove hair, cotton wool and other sundries entangled on the brush roller, ensure the cleaning effect of the brush roll, and avoid problems such as burning of the motor due to the entanglement of sundries.

The invention relates to a public toilet health air intelligentizing method and system. The method and system aim at solving the problem that efficiency is low and the effect is poor in the prior art. NH3 probes, H2S probes and local suction and exhaust air ports are arranged in toilet stools or beside the toilet stools or in toilet stool regions and used for detection, suction and exhaust of foul air beside the toilet stools or in the toilet stool regions, the local suction and exhaust air ports are provided with local suction and exhaust mechanisms capable of sucking and exhausting the foul air sucked by the local suction and exhaust air ports outdoors, the local suction and exhaust mechanisms are controlled by a central intelligent control system provided with a multimedia displayer for broadcasting the air quality in a toilet, and the intelligent control system starts or stops the local suction and exhaust mechanisms arranged on the probes to stop sucking or exhausting air according to detected data of the NH3 probes and the H2S probes. The public toilet health air intelligentizing method and system have the advantages that suction and exhaust are accurately positioned, manual operation and guard are not needed, ineffective work is avoided, the suction and exhaust effect is good, toilet air quality monitoring is user-friendly, energy consumption low, efficiency is high, the air quality in the toilet is guaranteed all the time, a user can pee and defecate at ease and joyfully due to multimedia play, and the pee and defecation environment can be remarkably optimized.

The invention discloses a kitchen cooking fume purification device. The kitchen cooking fume purification device comprises a motor, a centrifugal wind wheel box and a side suction plate. Side suctionwindows are formed in the side face of the side suction plate. The side suction windows are provided with smoke suction gaps. An oil outlet bolt is arranged on the bottom face of the side suction plate. The end, away from the oil outlet bolt, of the side face of the side suction plate is provided with a top suction plate. An oil volume display plate is arranged in the middle of the side face of the top suction plate. The position, close to the oil volume display plate, of the side face of the top suction plate is provided with a smoke suction switch. A top suction window is arranged on the bottom face of the top suction plate. A wall is arranged on the upper surface of the side suction plate. The side face, away from the side suction windows, of the side suction plate is provided with a machine case, and the side face, close to the side suction windows, of the machine case is provided with an oil collecting plate. The kitchen cooking fume purification device has the beneficial effectsthat efficient and rapid kitchen cooking fume suction can be achieved, the cooking fume can be thoroughly purified, and the suction and exhaust effects are good; and the device is arranged in the wall, the occupied space is small, head collisions can be prevented, the service life is long, running noise is low, the appearance is attractive, and cleaning is easy.

The invention belongs to the field of robots, and particularly relates to an anti-winding safe sweeping robot. The robot comprises a robot body, wherein a dust suction opening is formed in the lower surface of the machine body; a brush roller which is horizontally arranged is arranged in the dust suction opening; two cutting plates are arranged above the brush roller; cutting blades are arranged at the lower ends of the two cutting plates at equal intervals. A driving cavity is formed in one side of the dust suction opening; sliding rods are fixedly connected to the ends, close to the drivingcavity, of the two cutting plates; the two sliding rods are arranged in a staggered mode and extend into the driving cavity, the two sliding rods are fixedly connected with the inner side wall of thedriving cavity through reset springs, a motor is arranged in the driving cavity, a shifting wheel is coaxially installed on an output shaft of the motor, and two oppositely-arranged shifting blocks are fixedly connected to the side wall of the shifting wheel. The anti-winding safe sweeping robot can automatically and efficiently remove sundries such as hair and cotton fibers wound on the brush roller to guarantee the cleaning effect of the brush roller, thus avoiding the problems of motor burnout and the like caused by sundry winding.

The invention relates to a cutting platform for a roller type laser cutting machine. The cutting platform comprises a platform main body, a conveying mechanism and a smoke exhausting pipe. The cuttingplatform can achieve the purpose of continuous feeding and discharging of a whole roll of plate for the cutting platform, since plate conveying is achieved through support wheel rotation, the conditions that according to an original rolling cutting platform, a cut workpiece with a hole can be hung on supporting strips or a strip-shaped workpiece is clamped between upper and lower supporting strips, consequently the cutting platform cannot run, and the problem of damage occurs can be prevented; the smoke exhausting pipe can be closer to the plate processed by the cutting machine, so that the smoke suction and exhausting effects are better, the transmission efficiency is higher, and the stability is better, so that high-speed conveying of the plate can be realized; and a frequency conversion controller and a servo can be used for control, and cooperation with an unwinding leveler is achieved, so that automatic control is improved, and the work efficiency is greatly improved.

The invention belongs to the technical field of automobile part punching tool and especially relates to an automobile part punching mechanism hole press mould. The automobile part punching mechanism hole press mould disclosed by the invention comprises a hole press mould body, wherein a through hole for accommodating a processed part is formed in the hole press mould body, a downward punch head isarranged in an upper hole, the downward punch head can downwards punch the processed part under action of a downward punch motor and a downward punch air cylinder, and a chip exhausting opening is arranged on the lateral side of the hole press mould body and at the position close to the upper hole. The automobile part punching mechanism hole press mould disclosed by the invention has the beneficial effects of making processed part punching be integrally formed, automatically sucking and exhausting the iron scraps generated in processing, preventing the processed part from sliding in punchingand improving processing efficiency.

The invention relates to a range hood, comprising a case and a smoke collecting cover connected below the case, wherein a centrifugal fan is arranged in the case, and an air inlet communicating with an inner cavity of the case is arranged on the smoke collecting cover. The range hood is characterized in that the centrifugal fan is a double-suction centrifugal fan; the smoke collecting cover comprises a first cavity and a second cavity which are independent of each other, the air inlet communicates with the first cavity, and the first cavity communicates with a front air inlet of the centrifugal fan; and the second cavity extends downwards and is provided with an inclined plane which is inclined forwards from bottom to top, left side axial flow fans and right axial flow fan are arranged at intervals on the inclined plane, a baffle plate is arranged in the second cavity to divide the second cavity into a left passage corresponding to the left axial flow fan and a right passage corresponding to the right axial flow fan, and the left passage and a second airflow passage are both communicated with a rear air inlet of the centrifugal fan. According to the invention, the suction and discharge effect of the range hood can be significantly improved.

The invention discloses a moisture-absorbing, sweat-releasing and antibacterial nylon four-way stretch fabric and a preparation method thereof. The preparation method comprises the following steps of blank inspection, unwinding, cold batching, GO, blank fixing, cloth coiling, dyeing, discharging out of a vat after yarn beam dyeing, drying and cloth feeding, shaping and drying, intermediate inspection of cloth, shaping and packaging. According to the moisture-absorbing, sweat-releasing and antibacterial nylon four-way stretch fabric provided by the invention, antibacterial treatment is carried out while the gray fabric is dyed, the used antibacterial agent can still endow the gray fabric with a high antibacterial effect in the presence of a dyeing agent, the moisture-absorbing and sweat-releasing agent can also be used in a dye vat, and the antibacterial, moisture-absorbing and sweat-releasing operation is completed while dyeing is carried out.

The underwater desilting robot comprises a vehicle body assembly and a desilting device installed on the vehicle body assembly, the desilting device comprises a dredge pump, a cover body, a winch and a driving motor, a suction port and a sludge discharge port are formed in the cover body, the dredge pump is communicated with the interior of the cover body through the sludge discharge port, a grating plate is installed in the cover body, and the grating plate is connected with the winch. The winch is rotationally connected into the cover body, the driving motor is installed in the cover body, the driving motor is connected with a connecting shaft, and the connecting shaft is connected with the winch and used for driving the winch to rotate; an anti-blocking mechanism is arranged in the cover body, the anti-blocking mechanism comprises a rotating shaft and a plurality of first bristles arranged on the rotating shaft, the rotating shaft is connected with the connecting shaft, the rotating shaft is located on one side of the grating plate, and the rotating shaft abuts against the grating plate through the first bristles. According to the dredging robot, the grating plate can be automatically cleaned in the dredging process, the possibility that the grating plate is blocked by sludge sundries is reduced, the continuous dredging time of the dredging robot is prolonged, and then the dredging efficiency is improved.

The invention relates to a flow pushing mechanism and method for an extractor hood. The flow pushing mechanism for the extractor hood comprises an air feeding device which comprises draught fans and air guiding pipes, and is characterized in that the number of the air guiding pipes is three, and the number of the draught fans is two; the first end port of the first air guiding pipe and the first end port of the second air guiding pipe are both connected with an air outlet channel of the first draught fan; the first end port of the third air guiding pipe and the second end port of the second air guiding pipe are both connected with an air outlet channel of the second draught fan; the second end port of the first air guiding pipe is a first air outlet; the second end port of the third air guiding pipe is a third air outlet; a second air outlet is formed in the middle portion of the second air guiding pipe; the first air outlet, the second air outlet and the third air outlet all face an air suction port of the extractor good; and the three air outlets are located in three side faces of a smoke collection hood of the extractor hood correspondingly. The flow pushing mechanism for the extractor hood can guide floating cooking fume to flow to the air suction port of the extractor hood and push the cooking fume to be gathered towards the air suction port, and the suction and discharging effects of the cooking fume are greatly improved.

The invention relates to a draught fan capable of forming man-made tornado and an extractor hood. The draught fan comprises a motor, and an output shaft of the motor is connected with first blades. The draught fan is characterized in that the outer sides of the first blades are in coaxial driving connection with second blades, and the first blades and the second blades are opposite in rotating direction; the first blades are contained in a first sleeve or the first blades are arranged at an end opening of the first sleeve; the first sleeve is sleeved with a second sleeve; and the second blades are contained in an air flue formed between the first sleeve and the second sleeve or the second blades are arranged at an end opening of the air flue. According to the draught fan capable of forming man-made tornado and the extractor hood, suction force can be amplified in a multiplied manner, the strong tornado is formed, and airflow to be sucked is rapidly and thoroughly blown away.

The invention relates to a fan structure capable of forming artificial tornado and a range hood. The fan structure comprises a motor, and an output shaft of the motor is connected with a first fan blade. The fan structure is characterized in that the outer side of the first fan blade is coaxially driven by and is connected with a second fan blade, and the rotation direction of the first fan blade is opposite to that of the second fan blade; the first fan blade is accommodated in a first sleeve, or the first fan blade is arranged on a port of the first sleeve; the outside of the first sleeve is sleeved by a second sleeve; and the second fan blade is accommodated in an air flue between the first sleeve and the second sleeve, or the second fan blade is arranged on a port of the air flue. By using the fan structure, the structure of a tornado device is greatly simplified, the volume of the tornado device is reduced, and the tornado effect is good.

The invention discloses a tunneling device for pipe jacking construction, which relates to the technical field of geological engineering. The tunneling device includes a front cylinder body, a rear cylinder body, a front wall cutting assembly and a muddy water storage bin. The side wall of the warehouse is connected by rotation; it also includes the front sealing plate, the crushing assembly, the power assembly and the water injection and discharging mechanism; The side of the cutting assembly far away from the front cylinder is provided with a nozzle and the nozzle is connected to the shaft body; the crushing assembly is arranged on the shaft body and is located inside the muddy water storage bin, and the crushing assembly is used for when the shaft body rotates Crush the mud in the muddy water storage bin; the water injection and discharge group mechanism is used to absorb the mud accumulated in the muddy water storage bin and inject water stains into the shaft tube body. The invention has a simple structure, and the front wall rotary cuts the soil conveniently, which is convenient for excavation, and the mud material is chopped and mixed into mud and discharged in time, so the utility model has strong practicability.

The invention discloses an air energy firewood stove. A firewood inlet is formed in an outer sleeve; a fire door is movably mounted at the firewood inlet; an inner firewood inlet corresponding to the firewood inlet is formed in an inner sleeve; a smoke collecting hole is formed between the outer sleeve and the inner sleeve on two side parts of the inner firewood inlet; a heating hole is formed in the stove surface; a cover plate is movably covered at the heating hole; an ash falling hole is formed in the bottom of the stove; furnace teeth are arranged in the ash falling hole; an ash chamber shell is arranged under the bottom of the stove; an ash hole is formed in the side part of the ash chamber shell; an ash hopper is inserted and mounted in the ash chamber shell through the ash hole; and a smoke exhaust hole is also formed in the outer sleeve. The air energy firewood stove has the advantages that the smoke is effectively prevented from directly dissipating out of the heating hole or the firewood inlet, so that the heat energy utilization rate is increased, the smoke collection effect is enhanced, the consumption of fuel is reduced, and the energy conservation and environment protection effects are improved.

The invention belongs to the technical field of automobile part punching tools and particularly relates to an automobile part punching mechanism with powerful scrap iron suction and discharge functions. The automobile part punching mechanism with powerful scrap iron suction and discharge functions comprises a base, wherein a hole pressing die is arranged on the base, a through hole capable of accommodating a machined part is formed in the hole pressing die, and a lower punch is arranged in an upper hole and punches the machined part under the action of a charger and a lower punching cylinder;a scrap discharge port is formed in the position, close to the upper hole, of the side of the hole pressing die. The automobile part punching mechanism with powerful scrap iron suction and discharge functions has the benefits as follows: 2 holes can be simultaneously machined once, so that punching of the machined part can be performed once, scrap iron formed during machining can be automaticallysucked and discharged, and the machining efficiency is improved.

The invention belongs to the technical field of cold headers, and particularly relates to a cold header oil fume removing device which comprises a cold header body, a discharging channel is fixed to the discharging position of the cold header body through bolts, the side, away from the cold header body, of the discharging channel inclines downwards, and an air outlet is formed in the top of the discharging channel in a penetrating mode. An air inlet is formed in the bottom of the discharging channel in a penetrating mode, a discharging port is formed in the side, away from the cold header body, of the discharging channel in a penetrating mode, a jumping assisting block is fixed to the inner wall of the bottom of the discharging channel through bolts, the section of the jumping assisting block is arranged to be triangular, and the jumping assisting block is arranged above the air inlet. A turning mechanism is arranged in the air inlet, a discharging assisting mechanism is arranged in the discharging port, and an oil filtering mechanism is arranged in the discharging channel. According to the device, when the workpieces are discharged, engine oil is shaken off, so that the dual effects of sucking and discharging oil smoke and separating the engine oil adhered to the workpieces are achieved.

The invention relates to the technical field of constructional engineering, in particular to a rotary self-retaining wall pore-forming cast-in-place pile drill bit and a drilling method. A rotary self-retaining wall hole-forming cast-in-place pile drill bit comprises a main drill part, a drill bit body is arranged at the lower end of the main drill part, and the outer wall of the main drill part is sleeved with a rotatable retaining wall outer barrel; a convex part is arranged on the inner wall of the protective wall outer cylinder; the outer wall of the main drill part is provided with a groove used for being clamped into the protruding part to limit the rotation range of the protection wall outer cylinder. Notches are distributed in the protective wall outer cylinder, and blades capable of turning over transversely are arranged in the notches; the main drill part is provided with a pushing piece used for controlling the blades to be opened and closed. Grout outlet holes for outputting concrete grout and liquid outlet holes for outputting an accelerator are formed in the blades; a mud inlet hole is formed in the lower end of the main drill part, and a mud suction pipe is arranged in the main drill part and communicated with the mud inlet hole. According to the invention, the self-protection wall of the cement-mixed soil can be realized, and the cement-mixed soil protection wall can be rapidly formed by injecting cement paste and an accelerator into the protection wall layer during hole forming.