405 results about "Jet (fluid)" patented technology

A system and method for enhancing marine vessel efficiency through integrated hull optimizations is disclosed. The system includes automated bow thruster covers that reduce hull drag and condition water flow, coupled with strategically positioned air lubrication nozzles that create and maintain an air layer under the vessel. The bow thruster covers may be configured as circular doors or parallel panels, optionally incorporating air discharge ports or working in conjunction with dedicated air jets. An intelligent control system optimizes the integrated components using real-time sensor data and computational fluid dynamic analysis. The system modulates air distribution and cover positions based on sea conditions and vessel speed, maintaining optimal efficiency during operation. External surfaces may incorporate superaerophilic structures to enhance air retention and reduce drag. The comprehensive integration of these components provides improved hydrodynamic efficiency while maintaining full bow thruster functionality when required.

The invention relates to the technical field of mixing pile machines, in particular to a two-way mixing drill bit structure for a mixing pile machine and a construction method.The two-way mixing drill bit structure comprises a sleeve body, and multiple sets of sleeve holes are formed in the outer wall of the sleeve body; a rotary shaking mechanism is arranged in the sleeve body, and an air injection blowing mechanism and a bidirectional rotating mechanism are arranged on the sleeve body; the rotary shaking mechanism comprises sliding grooves formed in the inner wall of the sleeve body and corresponding to the two sides of the sleeve hole, the inner wall of each sliding groove is slidably connected with a lifting plate, a spring is fixedly connected to the position, corresponding to the interior of the corresponding sliding groove, of one end of the outer side of each lifting plate, and each spring is fixedly connected with the corresponding sliding groove. According to the device, a lifting plate can move inwards and outwards, so that a pushing column is driven to do the same movement, soil in a sleeve hole is pushed away, the sleeve hole is prevented from being blocked by the soil, and the flowability of the sleeve hole is guaranteed.

The invention discloses a distributed jet active flow control-based rotor wind tunnel test method, which belongs to the technical field of aviation aerodynamic wind tunnel tests, and comprises the steps of rotor test bed dynamic characteristic test, manipulation matrix calibration, preposed preparation of rotor model dynamic balance and common taper adjustment, and dynamic balance and common taper adjustment. And then hovering and forward flight wind tunnel tests of distributed jet active flow control are carried out in sequence, test data are collected and processed, and the aerodynamic performance of the rotor wing under the condition that jet control exists or not is compared and analyzed. According to the invention, the industrial blank of the lack of a distributed jet active flow control rotor wind tunnel test method is filled, and key technical support is provided for theoretical research, technical optimization and engineering application of the rotor distributed jet active flow control method.

Provided herein are shaped-charges having curved walls to provide better controllable and improved liquid jet parameters. The shaped-charge comprises a container having a plurality of curved walls for containing a liquid. One or more explosive charges are immersed in the liquid and a detonator channel positioned through the container wall to controllably detonate the one or more explosive charges and from a wedge-shaped liquid jet. Multipoint initiation is achieved using a number of initiation points; a location of one or more initiation contact points with the geometrically-shaped explosive charges; and / or an initiation timing of each of the initiation contact points, including simultaneous initiation or a sequence of initiations. Also provided are related methods of forming liquid jets and attendant applications, including target disruption.

The invention relates to a jet pump (100) for conveying a suction fluid (242) in a refrigerant circuit (200) of a temperature control system using a propellant fluid (231) and utilizing the Bernoulli effect, wherein the jet pump (100) has a primary nozzle (103) for accelerating the propellant fluid, a secondary connection interface (102) for supplying the suction fluid, a mixing tube (104) downstream of the primary nozzle (103) and downstream of the secondary connection interface (102), and a diffuser (105) downstream of the mixing tube (104), wherein in an end section (140) of the mixing tube (104), which is located at an end of the mixing tube (104) furthest from the primary nozzle (103) and closer to the diffuser (105), a thrust edge (130) is provided which is configured to act in a supersonic The flow in the mixing tube (104) is intended to trigger a compression pulse in the final section (140). Furthermore, a refrigerant circuit (200) with such a jet pump (100) is proposed.

A filament mesh structure, methods of manufacture and forming the filament mesh structure, and seat assembly having the filament mesh structure. The filament mesh structure may be cut by a fluid jet, may be heated with fluid to facilitate reshaping, or both. The filament mesh structure may be provided with a foldable connecting segment that facilitates folding of the filament mesh structure.

The application discloses a step variable pressure type micro-channel heat dissipation structure and a high-power laser cut-off light screen, and the structure comprises a flow channel (3), a gradually widened micro-channel (4), a first step variable pressure structure (5) and a second step variable pressure structure (6). The first step variable pressure structure (5) and the second step variable pressure structure (6) comprise a plurality of step-by-step increased elliptical cylinder arrays, the number of the elliptical cylinders is step-by-step increased, the length of the short axis of the elliptical cylinder is step-by-step decreased, the fluid flow cross-sectional area is step-by-step decreased, and the flow speed is step-by-step increased to form a jet effect to accelerate the fluid, and finally the fluid enters the gradually widened micro-channel (4) at a higher flow speed to realize flow heat exchange. The step variable pressure structure with the step-by-step increased number of elliptical cylinders, the step-by-step decreased length of the short axis and the step-by-step decreased total flow cross-sectional area at the micro-channel inlet section can rapidly and gradiently increase the pressure to accelerate the fluid, and effectively solve the problems of excessive and concentrated pressure at the micro-channel inlet.

The invention discloses a magnetorheological polishing liquid supply system and method based on a jet technology, and relates to the technical field of magnetorheological polishing, the magnetorheological polishing liquid supply system comprises a liquid storage and conveying module, the liquid storage and conveying module comprises a liquid storage device, a conveying device and a pulsation attenuation module, and the magnetorheological pulsation attenuation module is provided with a magnetorheological pulsation attenuator which is connected in series between an outlet of a servo variable pump and a conveying pipeline; the spraying execution module comprises a nozzle and a position adjusting assembly; the multi-dimensional detection module comprises a visual sensor, a Coriolis flow meter and an MEMS pressure sensor; the modeling and predicting module is used for calculating pipeline resistance according to the relative position of the nozzle and the workpiece and predicting pulsation by decomposing a pump pulsation rule through Fourier transform; and the dynamic regulation and control module is used for controlling the attenuator to counteract the pulsation according to the pulsation prediction output reverse current, and regulating the displacement and the rotating speed of the pump in real time through a fuzzy PID algorithm in combination with preset target flow and pressure. The problem that in the prior art, the injection parameter control precision is limited is solved, and high-precision regulation and control are achieved.

The present application relates to a kind of staggered jet microchannel heat sink, including cover layer, manifold layer, jet layer and microchannel layer stacked in turn, cover layer is equipped with fluid inlet and fluid outlet, manifold layer is used to shunt the fluid of fluid inlet, jet layer is equipped with array distribution jet orifice and backflow hole, jet orifice and backflow hole staggered distribution, microchannel layer is equipped with heat dissipation groove, heat dissipation groove is equipped with array distribution columnar needle fin, and form needle fin microchannel, the axial direction of columnar needle fin and the jet direction of jet orifice are parallel to each other;Fluid emitted by jet orifice is boiled and carries out transverse flow in needle fin microchannel and absorbs heat, based on the staggered distribution of jet orifice and backflow hole, the transverse flow fluid in needle fin microchannel presents staggered counterflow, and flows to fluid outlet by backflow hole.Compared with prior art, the present application improves the temperature uniformity of heat dissipation object, effectively suppresses the generation of local hot spot and greatly improves heat exchange efficiency.

The utility model relates to powder conveying technical field especially is concerned on a kind of catalyst carrier powder conveying equipment;Including the hopper of cone angle ≥70 °, the roughness Ra of the inner wall surface of hopper ≤0.4 μm, pneumatic flow-aiding ring is set in the height ≤1 / 3 cone height of hopper lower part and the height from discharge port, and the annular air cavity of pneumatic flow-aiding ring is connected outside gas source;Pneumatic flow-aiding ring circumferentially distributes first nozzle group and second nozzle group, and the jet direction of first nozzle group is inclined upwards along hopper inner wall, for fluidizing powder layer in advance;The jet direction of second nozzle group is inclined downwards along hopper inner wall, for promoting powder slip.

The present application belongs to the technical field of geotechnical engineering and indoor test, and provides a visual test device and method for interaction between high-pressure rotary jet flow and soft soil, which comprises a detachable model box, a jet medium simulation system, a high-pressure rotary jet flow generation system, an overburden pressure simulation system, a data acquisition system and a tracing system.The test device has the advantages of high visual degree, detachability, easy assembly and easy production.The jet medium simulation system has significant shear thinning characteristics, and has a high degree of reduction of the non-Newtonian fluid properties of cement slurry, which not only overcomes the problem of easy blockage of the pipeline, but also avoids distortion defects.The trajectory of the fluorescent powder particles in the jet medium simulation system can be captured by a high-speed camera under the irradiation of the pulsating laser beam generated by the pulsating laser, so as to accurately reproduce the flow field information of the high-pressure rotary jet flow in the soft soil.

The present application belongs to the field of oil drilling technology, and discloses a PDC drill bit for rock breaking by pressure pulse impact oscillation. The specific technical scheme is as follows: the PDC drill bit for rock breaking by pressure pulse impact oscillation is composed of an upper threaded joint, a shell, a jet pulse block and a drill bit. The jet pulse block is composed of a fluid inlet, a left feedback channel outlet, a right feedback channel outlet, a left fluid channel, a right fluid channel, a left backflow feedback inlet, a left backflow annular fluid channel, a right backflow feedback inlet, a right backflow annular fluid channel, a fluid outlet and a fluid outlet cavity. After the drilling fluid passes through the upper threaded joint, it enters the jet pulse block from the fluid inlet, and then passes through the fluid outlet and flows out from the drill bit water eye. When the drilling fluid passes through the jet pulse block, the flow direction of the drilling fluid will change periodically due to the action of the feedback channel, and a pressure pulse will be generated, forming impact oscillation, and thus accelerating the rock breaking and drilling of the drill bit. The present application has the function of improving the rock breaking efficiency of the drill bit by relying on pressure pulse impact oscillation.

The utility model relates to the technical field of rotary ejectors, and discloses a storage tank modified rotary ejection stirrer which comprises a driving impeller and an ejection nozzle, and the driving impeller is horizontally arranged and is designed to face an oil inlet pipeline; the radial flow of fluid is enhanced, stronger turbulent flow is formed, uniform mixing of oil products is promoted, the blending efficiency and quality are improved, and a shaft rod connected to a driving impeller is horizontally and rotationally arranged in an oil inlet shell; the spraying nozzle is used for spraying oil in all directions to blend the oil in the oil storage tank so as to prevent sedimentation; a plurality of jet nozzles are annularly arranged on the jet shell above the oil inlet shell at equal intervals; the jet nozzle comprises a bent pipe which is communicated with the flange interface on the jet shell through a flange plate A and a nozzle which is in threaded butt joint with the bent pipe; the spraying direction and angle of the spraying nozzle are adjusted by detaching and replacing the bent pipe and the spraying nozzle so as to meet different adjusting requirements, and the operation flexibility and the system adaptability are improved.

This utility model relates to a fluid nozzle, particularly a high-efficiency entrainment-type fluid mixing jet nozzle. It includes a nozzle body, characterized by a double-layer structure comprising an outer circular tube and a central guide cone arranged concentrically; both the outer circular tube and the central guide cone have ejector holes and baffles at their fluid outlet ends. The structure is simple and can be used not only for gas entrainment mixing but also for liquid entrainment mixing, such as the mixing of wastewater and pharmaceuticals, and acid-base neutralization in chemical processes, thus having a wide range of applications. The addition of ejector holes to the nozzle creates a vacuum region inside the ejector hole due to the high-speed flow of the fluid, allowing fluid from outside the nozzle to enter the nozzle, increasing the mixing performance and creating premixing within the tube. Experiments have verified that this structure significantly increases the mixing performance of the two fluids, improves the uniformity of mixing, effectively avoids flame root quenching, and ensures stable combustion.

This invention relates to the field of underwater propulsion technology, specifically to an array-type disc-shaped underwater propulsion device based on piezoelectric drive, comprising: a shell, disc-shaped, with the axial direction of the shell pointing in the direction of propulsion; an inlet and a rear cover on the shell, the shell and the rear cover forming a receiving cavity; multiple piezoelectric drive units embedded within the shell, each piezoelectric drive unit's jet direction facing the rear of the propulsion device; and a hollow suction channel located within the receiving cavity and correspondingly positioned around each piezoelectric drive unit. The inlet of the suction channel connects to the inlet, and the outlet is arranged around the nozzle of the jet cavity, forming a local negative pressure suction zone. This design enables the propulsion device to provide partial thrust even during low-pressure fluid intake, further enhancing the propulsion performance.

A cooling system for marine jet engines includes a marine jet engine assembly, a pressurized raw water inlet, a centrifugal filter, a strainer, and a hull-mounted heat exchanger. The marine jet engine assembly is configured with an engine, a drive shaft, a stator, a manifold heat exchanger, an exhaust, a water pump, and a coolant outlet so that the vessel can be functional. The pressurized raw water intake is in fluid communication with the stator. The centrifugal filter is in fluid communication with the pressurized raw water intake to supply a direct flow of raw water from the stator. The raw water is then cleaned through the strainer, discharged into a water inlet of the manifold heat exchanger, and discharged from a water outlet of the manifold heat exchanger before exiting into the exhaust. The hull-mounted heat exchanger is in fluid communication with the coolant outlet and the water pump.

The utility model discloses an elastic compensation jet device and belongs to the technical field of high-speed jet. The utility model provides an elastic compensation jet device which aims at solving the problems that a traditional jet device is seriously limited in use scene, the advantages of jet fluid cannot be exerted when the jet device is used on an uneven bearing face, and the speed of jet flow is seriously attenuated due to the influence of air resistance. According to the using method, when the movable carrier drives the jet flow part to work through the elastic compensation structure, high-speed fluid sprayed out of the jet flow nozzle is in a film shape. A series of defects and limitations of low efficiency, poor effect, large fluid flow, easiness in abrasion of a working surface, limited use scene and the like of a traditional jet mode are overcome, and the beneficial effects of high efficiency and high-standard jet are achieved.

This invention belongs to the technical field of oil well drilling equipment, specifically relating to a dual-feedback multidimensional impactor. It aims to solve the problems of significantly reduced rock-breaking efficiency and increased drill bit wear when encountering hard or medium-hard coarse-grained heterogeneous rock formations during drilling. The invention includes a main body and a fluid channel disposed within the main body. The main body is arranged inside the drill bit. The fluid channel includes a fluid inlet, a jet channel, an attached-wall oscillation chamber, a first outlet, a second outlet, and a feedback channel. The fluid inlet, jet channel, attached-wall oscillation chamber, and feedback channel are arranged along the axial direction of the main body, while the first and second outlets are arranged radially. The fluid inlet, first outlet, and second outlet are connected to the outside of the main body. A mechanical feedback component is installed in the feedback channel. This invention can generate axial and radial impacts, improving operational efficiency.

A method for rejecting products comprising the steps of: conveying the products along a conveyance line (2); inspecting the products in transit along the conveyance line (2); removing a first product having at least one defect detected during the inspection of the products; wherein the step of removing the first product comprises the step of hitting said first product with a fluid jet delivered by a first nozzle (31) controlled by a first solenoid valve (41); the step of hitting the first product being determined by a removal procedure comprising in turn the following steps: making electric current pass through an electric conductor (410) in the first solenoid valve (41) and which opens a switch (411) that alternatively would prevent the passage of a fluid flow through the first solenoid valve (41);-making the fluid flow pass through the first solenoid valve (41); the step of making the fluid flow pass through the first solenoid valve (41) placing the fluid flow in thermal contact with said conductor (410) to cool or heat it; performing a diagnostic check to verify the actual passage of the fluid flow through the first solenoid valve (41); wherein the step of performing said diagnostic check comprises the sub-step of determining a parameter associated with a temperature of the conductor (410) of the first solenoid valve (41).

The application belongs to the technical field of jet pump equipment, and discloses a double-nozzle jet pump capable of improving pumping efficiency. The jet pump comprises a pump body, a sleeve pipe and a pump core. The pump body is provided with a working fluid channel, a transported fluid channel and the pump core. The sleeve pipe is sleeved on the pump body and forms a mixed fluid discharge channel with the sleeve pipe. The pump core comprises an inlet inner cavity connected with the working fluid channel, two nozzles symmetrically connected with the inlet inner cavity along the axial direction, a throat pipe arranged at intervals with the outlet of the nozzle, and a diffusion pipe connected with the outlet of the throat pipe. The diffusion pipe is connected with the mixed fluid discharge channel, and the transported fluid channel is connected with the nozzle. The working fluid enters the inlet inner cavity through the working fluid channel and enters the two nozzles at the same time. A low-pressure area is formed at the outlet of the nozzle, so that the transported fluid is sucked into the nozzle through the transported fluid channel, and then the working fluid and the transported fluid are mixed to form high-speed mixed fluid in the throat pipe. The high-speed mixed fluid is pressurized through the diffusion pipe and discharged through the mixed fluid discharge channel.

A device for generating a jet of two-phase fluid, comprising a nozzle having a main duct that is fed with a pressurized gaseous fluid and opens into a mixing chamber, and at least one secondary duct that is fed by at least one pressurized fluid and opens into the mixing chamber in a direction forming a non-zero angle with the axis of the main duct. The mixing chamber has a convergent-divergent cylindrical wall having a constriction defining an opening in the plane perpendicular to the axis of the main duct. The convergent part of the wall has a frustoconical region in the continuation of the axis of the at least one secondary duct so as to form a fragmentation chamber for the liquid phase.

The invention belongs to the field of structural engineering and fluid mechanics, and particularly relates to a passive vortex vibration control device and method based on a collision type tuned mass damper and synthetic jet flow combination. The control device comprises a piston cylinder arranged in the bluff body structure, a piston capable of doing reciprocating motion is arranged in the piston cylinder, through holes are formed in the surfaces, located on the two sides of the piston cylinder, of the bluff body structure, and the two ends of the piston cylinder are communicated with the through holes through fluid pipelines. When vortex-induced vibration happens to the bluff body structure, the piston is driven by structural vibration to reciprocate in the piston cylinder, on one hand, the damping control effect of the tuned mass damper is generated, vibration energy is dissipated through gas compression and expansion, on the other hand, fluid is driven to flow in the fluid pipeline, periodic zero-mass synthetic jet is generated at the position of the through hole, and the zero-mass synthetic jet is generated. The interference vortex falls off, and the fluid load is reduced. According to the invention, through two cooperative physical mechanisms of damping control and flow control, the vortex vibration of the structure is jointly and efficiently inhibited from two aspects of energy dissipation and energy absorption.

This invention discloses an oil-water-gas well reservoir expansion and sealing jet fluid production and sand removal device, relating to the field of oil production technology. The device includes a central tube and further comprises: an expansion assembly located around the central tube, with its lower end positioned on the central tube and its upper end capable of sliding on the central tube, used for radial expansion under the drive of a hydrodynamic fluid; and a jet nozzle located below the central tube and below the expansion assembly, used to spray hydrodynamic fluid, creating a negative pressure zone in the spray area to absorb formation fluid. This integrated design combines the expansion assembly and the jet nozzle, allowing for the completion of both annular sealing and jet fluid production and sand removal functions in a single well run, avoiding the cumbersome process of two well runs required by traditional technologies and shortening the operation time.

The invention provides a mixed flow heat exchange device for outputting hot water, which is characterized in that the connecting line of the vertexes of the section of a jet pipe is a square, a pipe wall is formed between the adjacent vertexes of the square, the pipe wall is bent, the bending direction of the bend faces the center of the square, and jet holes for jetting from the inside of the jet pipe to the outside of the jet pipe are formed in the pipe wall. The invention provides a heat exchange device adopting a novel square jet pipe, so that the mixing heat exchange effect of two fluids is better and more uniform, and the heat exchange efficiency is improved.

The invention belongs to the technical field of fluid conveying equipment, and particularly relates to a steam-jet pump with a detachable nozzle. The steam jet pump with the detachable nozzle comprises a pump body and a core assembly. The pump body comprises a containing cavity and a suction chamber which communicate with each other. The core assembly is detachably arranged on the pump body and comprises a base shaft and a nozzle arranged at one end of the base shaft, the base shaft and the nozzle are at least arranged in the containing cavity, and the outlet end of the nozzle extends into the suction chamber. According to the application, the core body assembly integrated with the basic shaft and the nozzle is integrally disassembled, and a new core body assembly is installed, so that the time required for replacing the nozzle is shortened, the cost is reduced, and the working efficiency is improved.

This invention discloses a drag reduction and thrust reversal device, relating to the field of fluid dynamics technology. The invention includes a front drag reduction air intake assembly, an automatic rotary cutting assembly, two fluid delivery pipes, and the drag reduction and thrust reversal assembly. The automatic rotary cutting assembly is mounted on the front drag reduction air intake assembly. In this invention, the drag reduction and thrust reversal device, composed of the front drag reduction air intake assembly, the automatic rotary cutting assembly, the fluid delivery pipes, and the drag reduction and thrust reversal assembly, efficiently captures oncoming fluid through an inclined inlet at the front. A filter baffle at the inlet blocks large debris, which is then shredded and mixed by fluid-driven rotary cutting blades. The mixture is then transported through the fluid pipes to the end delivery pipes. Under the action of the tail jet pressurization device, the fluid forms a vortex and is ejected at high speed, generating reverse thrust. This converts oncoming resistance into propulsive power, directly propelling the ship forward, achieving the dual effects of drag reduction and thrust reversal, and converting drag energy into forward propulsion.

The present invention relates to a hydroentangled shell (16), in particular a hydroentangled shell (16) for manufacturing a nonwoven fabric (12), preferably a non-porous nonwoven, by means of a web bonding process using a fluid jet (20). The housing (16) includes a body including interconnected dams (36). The body has a front side (52) that directs the fluid jet during use of the fluid jet and a back side (54) opposite the front side (52). The dam (36) defines an opening (34) configured to allow fluid to pass from the front side to the back side. The dam (36) has a shaped fluid jet rebound surface (50) configured to establish a laterally oriented rebound effect of the fluid jet. In one embodiment, the resilient surface (50) includes differently inclined portions (38, 40, 44, 44 ', 46) on the front side (52).

The application relates to the field of turbulent flow control in fluid mechanics and discloses a natural gas drag-reducing agent atomization injection indoor circulation system. The system is composed of a natural gas drag-reducing agent atomization device and an indoor circulation pipeline; the natural gas drag-reducing agent atomization device comprises a shell, a conical jet cylinder and a gas-liquid mixing cavity; a conical jet cylinder and a nozzle are arranged in the shell; the nozzle can be automatically adjusted within an angle range of 20-80 degrees according to the natural gas conveying flow; a blade support plate cuts the mixed drag-reducing agent to atomize the drag-reducing agent again; the particle size of the atomized drag-reducing agent ranges from 20 to 40 microns; square magnet blocks are evenly arranged on the outer wall of the indoor circulation pipeline; the number of the square magnet blocks is 114; the length of each square magnet block is 200 mm, the width is 80 mm, and the thickness is 50 mm. The application utilizes the comprehensive effect of jet flow, cutting and electromagnetic field to enhance the atomization and adhesion effect of the drag-reducing agent; the drag-reducing effect of the drag-reducing agent atomization injection is evaluated based on control variables; and the result can be applied to the drag-reducing conveying of a natural gas long-distance pipeline.

The invention discloses a large belly borehole rotary centralizer and a well washing device. The large belly borehole rotary centralizer comprises an outer shell, a rotating structure and power blades. The outer shell is used for being arranged on a sleeve of a drilling well in a sleeving mode. The two ends of the outer shell are connected with the casing pipe through rotating structures respectively, a fluid channel is formed between the outer shell and the casing pipe, the two ends of the fluid channel penetrate through the rotating structures to be communicated with the outside, jet flow holes are formed in the outer shell and communicated with the fluid channel, and the jet flow holes are used for jetting fluid to the well wall of a drilled well. The power blade is arranged in the fluid channel and used for applying impact force of fluid to the outer shell to enable the outer shell to rotate, the outer shell carries the fluid to rotate in the rotating process, larger centrifugal force is obtained, and the cleaning effect of a large belly borehole is improved.

The utility model relates to the technical field of grinding machine cutting fluid treatment, in particular to a grinding machine cutting fluid treatment device for die steel processing, which comprises a circular treatment box, a cover plate is fixedly mounted on the front surface of the circular treatment box, a guide column is fixedly mounted in the middle of the inner side of the circular treatment box, and a rotary switching mechanism is arranged outside the guide column; and the flow guide groove is formed in the guide column in the axial direction and located in the middle-upper position of the guide column, a first opening communicated with the flow guide groove is formed in the top end of the guide column in a penetrating mode, a second opening is inwards formed in the bottom end of the guide column, and a blowing cleaning mechanism is arranged in the second opening. According to the utility model, the nozzle is arranged downwards and is matched with the air flow channel in the guide post, so that the problem that an air spraying pipe orifice is easily blocked by cutting fluid chippings in the prior art is effectively solved.