40results about How to "Easy to drill out" patented technology

The invention discloses a bridge plug with a large drift diameter. The bridge plug comprises an upper joint, a central tube, a guiding shoe head and a bridge plug assembly; the upper joint is an annular part and is fixedly connected with the outer side of one end of the central tube in a sleeving mode; the central tube is a metal central tube, a soluble ball base is arranged at the end, close to the upper joint, of the central tube, and the central tube is a drillable metal part; the guiding shoe head is an annular part, is fixedly connected with the outer side of the other end of the central tube in a sleeving mode and is provided with a device used for being fixedly connected with a pull rod which is arranged in the bridge plug in a sleeved mode; the middle section of the central tube is sleeved with the bridge plug assembly which is located between the upper joint and the guiding shoe head. The invention further discloses a setting method of the bridge plug with the large drift diameter. The drilling polishing procedure of the bridge plug with the large drift diameter can be omitted, the problems of a long construction period, high operation cost and high construction risk brought by drilling polishing are solved, and the bridge plug is easier and more convenient to use and faster to construct.

Provided are a tool and a method for injecting cement into the top of a horizontal well screen pipe without drilling and plugging. The tool for injecting the cement into the top of the horizontal well screen pipe without drilling and plugging is composed of a drilling-free and plugging-free tool, a bumping pressing rubber plug and a fishing tool. During construction, the drilling-free tool is lowered to the well along with a sleeve bunch. A well mouth is pressurized, a packer is sealed through expansion, pressurization is continued, a starting piston is opened, circulation is built, and well cementation is conducted normally. The bumping pressing rubber plug is added for bumping pressing at the later stage of the well cementation, the piston is closed simultaneously, a circulation channel is closed, and the well cementation is finished. After cement curing is finished, fishing is conducted through a small drill pipe connected with a fishing anchor, the small drill pipe and the fishing anchor are lifted after being in place, slips are opened, a fishing drum is blocked, an internal structure of the drilling-free tool is lifted together, and construction is finished. During a working process, a well completion accessory used in the process is not affected by drilling and grinding, service life is greatly prolonged, diameter in a well completion pipe column is large, the inner surface of the well completion pipe column is smooth, and smooth implementation of acid washing and gravel packing is guaranteed. Well completion working time of a single well is reduced by 24 hours on average, and well completion cost is greatly saved.

The invention discloses a full-automatic pit digging, fertilization, discharge and planting device. The upper end of a base is connected to an upper seat plate, the bottom surface of the upper seat plate is provided with an auxiliary oil cylinder, the auxiliary oil cylinder is connected to a lifting plate, the center of the lifting plate is provided with a drill bit, the bottom of the lifting plate is provided with a fixed cylinder, a telescopic cylinder is arranged in the fixed cylinder, the upper end surface of the lifting plate is provided with a material storage box, a lower end port of the material storage box is connected to a material guide sleeve, the material guide sleeve sleeves a material scattering box, the material scattering box is provided with a material scattering hole, the material scattering box is fixed in the telescopic cylinder, the drill bit is located in the fixed cylinder, a casing pipe shaft is arranged in the drill bit and is connected to the auxiliary oil cylinder, the auxiliary oil cylinder is connected to the upper seat plate, the casing pipe shaft is arranged in a feeding hopper, a feeding plate is arranged in a discharge pipe, the feeding plate is provided with a material blocking plate, the feeding plate is provided with a sliding hole, the casing pipe shaft is provided with a pull rod, the lower end of the drill bit is provided with an opening / closing head and the base is provided with a work hole passing through the fixed cylinder. The device realizes automatic pit digging, automatic mass planting and automatic soil covering and greatly improves the efficiency of crop planting.

The invention discloses an agricultural automatic digging and fertilizing seeder. The agricultural automatic digging and fertilizing seeder comprises supporting rods arranged at the bottom of a base; wheels are arranged at the bottoms of the supporting rods; the upper end of the base is connected with an upper seat board by support rods; secondary oil cylinders are arranged on the bottom surface of the upper seat board; a lifting plate is arranged on telescopic shafts of the secondary oil cylinders; a rotational drill bit is arranged at the center of the lifting plate; a fixed barrel is arranged at the bottom center of the lifting plate; a telescopic cylinder is arranged in the fixed barrel; a material storing box is arranged on the upper end face of the lifting plate; a lower end opening of the material storing box is communicated with a material guiding sleeve; the material guiding sleeve sleeves a material spreading box; material spreading holes are formed in the material spreading box; the lower end of the material spreading box is fixed in the telescopic cylinder; the drill bit is located in the fixed barrel; the drill bit sleeves a quill shaft; the upper end of the quill shaft is connected with a mounting plate; the mounting plate is connected with the secondary oil cylinders; the secondary oil cylinders are vertically arranged at the bottom of the upper seat board; an opening / closing head is arranged at the lower end of the drill bit; a working hole is formed in the base. According to the agricultural automatic digging and fertilizing seeder disclosed by the invention, automatic digging, planting and fertilizing as well as earthing can be realized, so that the agricultural planting efficiency is greatly improved.

The invention discloses an automatic material mixing, processing, fertilization and planting device for agriculture. The upper end of a base is connected to an upper seat plate, the bottom surface of the upper seat plate is connected to a lifting plate through an auxiliary oil cylinder, the center of the lifting plate is provided with a drill bit, the bottom of the lifting plate is provided with a fixed cylinder, a telescopic cylinder is arranged in the fixed cylinder, the drill bit sleeves a casing pipe shaft, the casing pipe shaft is connected to the auxiliary oil cylinder, the lower end of the drill bit is provided with an opening / closing head, the upper end of the upper seat plate is provided with a material guide cylinder, the upper end of the material guide cylinder is provided with the fixed cylinder, the front end of the fixed cylinder is provided with a stirring cylinder, spiral blades are arranged in the stirring cylinder, the tail end of the stirring cylinder is provided with filter holes, the front end of the stirring cylinder is provided with a digging groove, the lower end of the stirring cylinder is provided with a farm chemical box, the casing pipe shaft is arranged in the material guide cylinder, a feeding plate is arranged in the material guide cylinder, the feeding plate is provided with a material blocking plate and a sliding hole, the casing pipe shaft is provided with a pull rod, the lifting plate is provided with a material storage box, the material storage box is communicated with a material guide sleeve, the material guide sleeve sleeves a material scattering box and the material scattering box is fixed in the telescopic cylinder. The device realizes automatic material mixing and burrowing, mass planting and soil covering and improves the efficiency of crop planting.

The invention discloses agricultural automatic mixing and planting equipment. An upper seat board is connected to the upper end of a base; the bottom surface of the upper seat board is connected with a lifting plate by secondary oil cylinders; a drill bit is arranged at the center of the lifting plate; a fixed barrel is arranged at the bottom of the lifting plate; a telescopic cylinder is arranged in the fixed barrel; the drill bit sleeves a quill shaft; the quill shaft is connected with the secondary oil cylinders; an opening / closing head is arranged at the lower end of the drill bit; a material guiding cylinder is arranged at the upper end of the upper seat board; the fixed barrel is arranged at the upper end of the material guiding cylinder; a stirring barrel is arranged at the front end of the fixed barrel; spiral blades are arranged in the stirring barrel; filtering holes are formed in the tail end of the stirring barrel; material digging grooves are formed in the front end of the stirring barrel; a pesticide box is arranged at the lower end of the stirring barrel; the quill shaft is arranged in the material guiding cylinder; feeding plates are arranged in the material guiding cylinder; material stopping plates are arranged on the corresponding feeding plates; a sliding hole is formed in each feeding plate; a pull rod is arranged on the quill shaft. According to the agricultural automatic mixing and planting equipment, automatic mixing and drilling, automatic batch planting and automatic earthing can be realized, so that the planting efficiency of crops is greatly improved.

The invention relates to the technical field of fruit tree cultivation, and discloses a method for treating walnut seeds before sowing. The method comprises the following steps that walnut seeds are placed in a seed soaking barrel to be soaked with hot water, fishes out to be dried at the shady, cool and ventilated place for 1-2 d, soaked with warm water, fished out and dried for 2-3 d; the walnut seeds are stored with wet river sand layer by layer, 7-9 layers are laid all together, and the uppermost layer is the sand layer; a container is placed in a greenhouse, hothouse or plastic house, the walnut seeds are sprayed with water one time every 12 h, and sand storage is kept for 3-7d. According to the walnut seeds treated through the method, at the eighth day, the germination rate reaches 80%; at the fourteenth day, the germination rate reaches 85% or more, operation time is short, the effect is achieved rapidly, the germination rate is high, operation is convenient, and the method is suitable for being applied and popularized.

The invention relates to a well cementation rubber plug used for a seabed oil well. The seabed oil well is connected to a marine riser extending to the sea surface, a casing pipe is arranged in the seabed oil well, a hollow drill pipe communicated with the casing pipe is arranged in the marine riser, and the well cementation rubber plug is arranged in the casing pipe. The well cementation rubber plug comprise a basal plug and a top plug, wherein the basal plug and the top plug can be connected in series with each other in a separated mode, both the basal plug and the top plug comprise a perforative cavity, the cavity of the basal plug is provided with a radial-shrinkage part and a downstream area of the radial-shrinkage part is provided with a through-hole which can be opened and closed and an entitative type basal plug opening tool, the basal plug opening tool can penetrate through the cavity of the top plug and is jointed with the radial-shrinkage part of the basal plug, both the basal plug and the basal plug opening tool are provided with a plug wing of which the radial direction extends outwards, the plug wing of the basal plug can be in close contact with the inner wall of the casing pipe, and the plug wing of the basal plug opening tool can be in close contact with the inner wall of the drill pipe. When the well cementation rubber plug used for the seabed oil well is used, mud in the casing pipe and the drill pipe can be discharged, thus the quality of the well cementation is improved.

The invention relates to a bridge plug. The bridge plug comprises a bridge plug body, wherein a slip and a slip driving part located at the upstream portion of the slip sleeve the bridge plug body, and the slip driving part is connected with the bridge plug body through an elastic receding-prevention mechanism. An elastomer also sleeves the bridge plug body, is located at the downstream portion ofthe slip and is in butt joint with the slip. When the bridge plug is used, an elastic rubber bucket extrudes the slip so as to prevent the slip from receding or getting loose after the slip is mounted and hung and the slip driving part is dismounted.

The invention relates to a welding method of a composite copper bar conducting layer. A welding part of a lead workpiece is positioned on a mounting part of a copper bar substrate by a positioning structure, so that next welding is facilitated. After positioning, a resistance soldering technology instead of chamfering is adopted, so that the mounting part can be arranged in any position of the copper bar substrate, the lead workpiece can be welded on the mounting part, a complicated composite copper bar product comprising a small forming part structure is obtained, and the welding strength and the connection reliability are improved. A non-welding part of the lead workpiece is placed in a heat-dissipation mold, so that heat of the non-welding part of the lead workpiece conducted by welding can be dissipated by the heat-dissipation mold, the non-welding part of the lead workpiece can avoid softening deformation and hardness and strength reduction due to overheating, the hardness and the strength of the non-welding part are ensured, and torsion resistance of riveting a nut in a non-welding area is ensured. In addition, the invention further relates to a composite copper bar.

The invention provides a bridge plug. The bridge plug comprises a central pipe made of light alloy. A tool connector is arranged at the upper end of the central pipe and arranged on the outer side of the central pipe in a sleeving mode. The bridge plug further comprises a first slip assembly and a second slip assembly which extend in the axial direction of the bridge plug. The first slip assembly and the second slip assembly are both arranged on the outer side of the central pipe in a sleeving mode, and the first slip assembly is connected with the tool connector. The central pipe of the bridge plug is made of the light alloy, thereby being capable of being drilled easily; the drilling time of the bridge plug is shortened, and metal chips generated during grinding and milling can be conveniently discharged to the ground. The bridge plug has the characteristic of being rapidly drilled, so that the production time is effectively shortened, and the economic benefits are increased.

The invention discloses perforating equipment convenient to pick and place an electronic component. The perforating equipment comprises a supporting rack, a first slide rail, a placing table and a base, wherein a hydraulic cylinder is arranged on the upper side face of the supporting rack and is connected to a top plate through a hydraulic rod; the hydraulic rod and the top plate are arranged on the inner side of the supporting rack; chutes are formed in the left and right inner side walls of the supporting rack, and the left and right ends of the top plate are arranged on the inner sides of the chutes; a motor is arranged on the lower side face of the top plate, and a drill bit is arranged on the lower side of the motor; the first slide rail and a second slide rail are fixed between the left and right inner side walls of the supporting rack, the first slide rail is arranged on the lower side of the top plate, and meanwhile, the second slide rail is arranged on the lower side of the first slide rail. As a baffle plate is arranged, the baffle plate penetrates a proper first empty slot by a user as needed, so that a roller is fixed to a proper position.

The invention discloses a method and a percussion bit for drilling a back taper hole in a concrete wall. The method includes adding a ball on a handle of the percussion bit, clamping a spherical clamp seat onto the ball of the handle which rotates, with the center of the ball as the support, within the clamp seat; during drilling, subjecting the percussion bit perpendicular to the wall to drilling downwards, and after the clamp seat is abutted against the wall, shaking the handle to drill with the center of the ball with the support, allowing the bottom of the bit to rotate at the bottom of the hole, in this way, a big-end-down back taper hole is formed. The method is simple and practical and convenient to drill the back taper hole in the wall. Through the back taper hole, the bottom of an expansion bolt is fully expanded, and friction between the expansion bole and the wall of the back taper hole is greatly improved, so that pull force applied to the expansion bolt is more than doubled. By the use of the method easy to handle, safety is improved after construction site supports or pipelines assembly, and construction is convenient.

The invention discloses a financial file hot-melting packaging device and a packaging method thereof, and relates to the technical field of hot-melting packaging. According to the financial file hot-melting packaging device and the packaging method thereof, a rotating disc is rotated through a grip, a drill bit is made to approach the top of a financial file, a motor is started and drives the drill bit to rotate, then a first grip is pressed downwards, the rotating disc and a moving plate move downwards through a sliding rod, and the drill bit drills a fixing hole in the financial file; then the rotating disc is rotated through the first grip, a heating rod is made to approach the top of the financial file, the heating rod is started, a riveting pipe is heated to be soft through the heating rod, the two ends of the riveting pipe are pressed to be deformed through a pressing block and a sliding plate outside the heating rod, and then the financial file is hot-melted, packaged and fixed; in this way, packaging of one side of the financial file can be completed at a time from punching to packaging without changing the position of the financial file, the working steps are simplified, and the working efficiency is improved.

The invention relates to a medical instrument, in particular to a bone nail countersink drill for the orthopedics department. The bone nail countersink drill comprises a bearing installation base anda bearing. The bearing is fixedly connected into the bearing installation base. A rotating shaft is fixedly connected with the inner ring of the bearing and penetrates through the bearing installationbase. A bone nail countersink drill stem is fixedly connected with the outer end of the rotating shaft. A gear is fixedly connected with the inner end of the rotating shaft. Two rotating rod fixing pieces are perpendicularly and fixedly connected with the upper end of the bearing installation base. A rotating rod is movably connected between the two rotating rod fixing pieces through a movable shaft. A rectangular rack fixing hole runs through the middle of the rotating rod. A rack is movably connected into the rectangular rack fixing hole through a pin shaft. The bone nail countersink drillis scientific and reasonable in structure, simple and convenient to operate and control, high in drilling efficiency, good in drilling quality, capable of shortening the time of orthopedic surgery andimproving the technological level of the orthopedic surgery and suitable for use and popularization.

The invention discloses a drilling device for brush pen tube production and processing and relates to the technical field of brush pen tube production. The drilling device comprises a drilling devicebody which comprises an isolation door, a drilling chamber, a base and a working table; one end of the isolation door is fixedly connected with one end of the drilling chamber by a hinge; the lower end of the drilling chamber is fixedly connected with the middle of the upper end of the base; and the inner bottom wall of the drilling chamber is fixedly connected with the lower end of the working table. On the one hand, a telescopic rotating rod can drive a drill bit to adjust the position of the drill bit, so that the drilling is more precise; on the other hand, the lower side of one end of a fixing groove communicates with one side of the upper end of the base by a connecting pipe, so that the chippings generated during the drilling can fall into the base directly to be cleaned conveniently; and then the isolation door can block the chippings splashed during drilling and prevent the chippings from entering the eyes of the operator and harming the health of the operator.

A bi-directional eccentric crankshaft center hole processing clamp is mainly composed of a center hole processing guide plate, a connecting rod, a flat cushion, an elastic cushion and a nut and the like. A bi-directional eccentric crankshaft is placed between two center hole processing guide plates to be connected to be an integrated body by utilizing the connecting rod, the flat cushion, the elastic cushion and the nut, the integrated body is clamped on a drilling machine, and three center holes are drilled in the end face of the crankshaft by rapid and accurate positioning through the center hole processing guide plates.

The invention discloses an intelligent multidirectional synchronous punching device for a vehicle-mounted brake pump shell. The device comprises a clamping and feeding device and a multidirectional angle adjusting device, the clamping and feeding device comprises a three-axis moving part, an L-shaped bottom plate arranged at the execution end of the three-axis moving part, an inclination angle adjusting part arranged on one side of the L-shaped bottom plate, and a clamping part is arranged at the execution end of the inclination angle adjusting part. The multidirectional angle adjusting device comprises a vertical plate, a transverse moving part arranged on one side of the vertical plate, a rotating part arranged at the execution end of the transverse moving part, a U-shaped supporting frame arranged at the execution end of the rotating part, L-shaped supporting frames rotationally connected with the U-shaped supporting frame, and included angle adjusting parts arranged between the U-shaped supporting frame and the L-shaped supporting frames. Fixing frames are arranged at one ends of the L-shaped supporting frame and the U-shaped supporting frame, drill bit switching parts are arranged at the bottoms of the fixing frames, and intelligent drill bit driving parts are arranged at the tops of the fixing frames. The punching device can synchronously punch workpieces at multiple angles and in multiple directions.

The invention discloses an environment-friendly pet runway. The runway includes insertion boards, through holes, a moving plate, a retractable rod, a linking shaft and a first winding turntable; the through holes are formed in the middles of the insertion boards, the retractable rod is installed on the top of the moving plate, and a first winding roller is installed in the middle of the linking shaft. The runway is scientific and reasonable in structure and safe and convenient to use; through arrangement of splicing plates, the splicing plates are spliced into the runway during usage and can be dismantled after use, convenience is provided for storage and movement, the runway can be conveyed to different places for activities, and the practicability is improved; through arrangement of theinsertion boards, multiple runway bodies can be separated for running of multiple pets at the same time, and the pets are prevented from running into the adjacent runway bodies or fighting with one another during running. The moving plate is arranged, a drawing cord is drawn to make the moving plate move forwards along the runway, and convenience is provided for training the pets for running. Through arrangement of the first winding turntable and a second winding turntable, a user pulls the drawing cord to move forwards by quintuple distance, and operation is convenient.

The invention relates to a drillable water hole. The drillable water hole comprises an upper sleeve body, a ceramic water hole and a lower sleeve body; sealing ring grooves are formed in the outer side walls of the upper sleeve body and the lower sleeve body; the ceramic water hole is of a hollow annular structure, and the longitudinal section thereof is of a convex structure; a first step and a second step matched with the ceramic water hole structure are arranged on the inner side walls of the upper sleeve body and the lower sleeve body; one end of the upper sleeve body is tightly contactedwith one end of the lower sleeve body; and the ceramic water hole is sleeved in a cavity formed by the upper sleeve body and the lower sleeve body, and is limited with the side wall and the bottom endof the ceramic water hole through the first step and the second step. The drillable water hole is easy to drill and capable of resisting wear.

The invention provides an oil hole drilling tool. The oil hole drilling tool comprises a rotating frame, a tool body and a cylinder. The rotating frame comprises a handle, a rotating rod and a gun frame. The handle is fixedly connected with the rotating rod connected with the gun frame. The tool body comprises a bottom support and a supporting plate. The bottom support comprises a bottom plate, a left supporting plate and a right supporting plate, wherein the length of the left supporting plate and the length of the right supporting plate are respectively larger than the length of the bottom plate. The cylinder is arranged on the front of the bottom plate and is arranged on the tail portion of one end of the bottom plate, and the left supporting plate is fixed to the left edge of the back of the bottom plate. The right supporting plate is fixed to the right edge of the back of the bottom plate. One end of the left supporting plate and one end of the right supporting plate are aligned with the end, provided with the cylinder, of the tail portion of the bottom plate. The oil hole drilling tool can be used for fixing a lug plate and precisely drilling holes, can guarantee that same oil holes meeting precision requirements can be drilled in the same portions of products respectively, has practicability, and can be used for easily and conveniently drilling qualified oil holes.

The invention relates to the technical field of blind plate devices adopted for oil and gas field exploitation, in particular to a reciprocating circular blind plate device. The reciprocating circular blind plate device comprises a base, a body and a sliding blind plate, wherein the base is of an annular structure, an inner cavity in the left part of the base is a horn cavity becoming smaller from left to right, an annular installing groove is formed in the right end of the base, and the outer wall of the right part of the base and the inner wall of the right part of the body are fixedly installed together; the sliding blind plate comprises an installing head and a working plate, the left part of the installing head is shaped like an annular frustum matched with the horn cavity, the right part of the installing head is matched with the inner cavity of the base, and an axial through hole is formed in the middle of the working plate. The blind plate device is reasonable and compact in structure and convenient to use, the blind plate device is equivalent to a non-circular blind plate under normal conditions, when casing running meets resistance and circulation needs to be set up, a new circulating channel can be set up for well flushing through reverse pressure build-up, blockage is eliminated, and the risk of well cementing and completion is reduced; the base and the sliding blind plate can be drilled away easily, and the blind plate device can be widely applied to various occasions.

The invention relates to the technical field of blind plate devices adopted for oil and gas field exploitation, in particular to a reciprocating circular blind plate device. The reciprocating circular blind plate device comprises a base, a body and a sliding blind plate, wherein the base is of an annular structure, an inner cavity in the left part of the base is a horn cavity becoming smaller from left to right, an annular installing groove is formed in the right end of the base, and the outer wall of the right part of the base and the inner wall of the right part of the body are fixedly installed together; the sliding blind plate comprises an installing head and a working plate, the left part of the installing head is shaped like an annular frustum matched with the horn cavity, the right part of the installing head is matched with the inner cavity of the base, and an axial through hole is formed in the middle of the working plate. The blind plate device is reasonable and compact in structure and convenient to use, the blind plate device is equivalent to a non-circular blind plate under normal conditions, when casing running meets resistance and circulation needs to be set up, a new circulating channel can be set up for well flushing through reverse pressure build-up, blockage is eliminated, and the risk of well cementing and completion is reduced; the base and the sliding blind plate can be drilled away easily, and the blind plate device can be widely applied to various occasions.

The invention relates to a method for injecting a cement plug into a horizontal well, and a construction method which are used for petroleum industry. The method for injecting the cement plug into thehorizontal well comprises the steps that the density of cement slurry and isolation liquid are equal, the cement slurry and the isolation liquid which are equal in density are displaced into an oil sleeve annulus from a construction pipe column in a spaced mode, the two send interfaces of a cement slurry and isolation liquid displaced section in the oil sleeve annulus are flush with the two sendinterfaces of a cement slurry and isolation liquid displaced section in the construction pipe column, the bottom of the construction pipe column, the oil sleeve annulus and a bottom hole are filled with the isolation liquid, meanwhile, the upper end interface of the isolation liquid displaced firstly and the upper end interface of the isolation liquid displaced lastly are located in the vertical well section of the horizontal well, at the moment, the construction pipe column is uplifted to the upper part of the upper end interface of the cement slurry, thus the cement slurry in the oil sleeveannulus is fused, after the well is shutdown for waiting on cement setting, the cement slurry located on the horizontal section is a suspended cement plug, and then the isolation liquid is washed out.The method has the advantages that construction is easy, operation is easy, sealing is reliable, the temperature-resistant performance is good, drilling is easy, and the method is not prone to beinglimited by the irregular well wall in a wellbore.

The invention relates to the technical field of manufacturing pressure vessels, in particular to an automatic scribing, positioning and opening equipment for metal horizontal pressure vessels. Locate the opening. The invention provides an automatic scribing, positioning, and drilling equipment for a metal horizontal pressure vessel, which can solve the problem of manually drilling a hole. The drilling process is cumbersome, and the drilling equipment is easy to shake during manual drilling, resulting in inconsistent diameters of the manually opened holes; it is difficult for the equipment to drill holes with different angles when drilling the pressure vessel. When drilling holes with different angles, it is necessary to rotate pressure vessel, which leads to cumbersome drilling process and reduces the production efficiency of pressure vessel.

The invention relates to a novel valve needle of a pressure control drilling throttle valve. The valve needle comprises a valve spool (1), a valve rod upper portion (2), a valve rod middle portion (3), a valve rod lower portion (4), a fluid passage (5), a cylindrical pin (6) and a lead filling area (11), stepped through holes are arranged along the axis direction of the valve spool (1), a transverse fluid passage (12) is arranged on the valve rod upper portion (2), the longitudinal fluid passage (5) arranged inside a valve rod is communicated with the transverse fluid passage (12), the valve rod lower portion (4) is connected with the valve spool (1) by means of threaded fit, the matched position of the valve spool (1) and the bottom end surface of the valve rod middle portion (3) is sealed by an O-shaped sealing ring (10), and the cylindrical pin (6) is inserted into a cylindrical pin groove. The valve needle has the advantages that the valve spool is made of YG8 alloy, the contour of the valve spool is machined in a numerically controlled manner according to a profile curve equation, the valve needle is high in machining accuracy, fine in abrasion resistance and erosion resistance, long in service life, fine in sealing performance and convenient to disassemble, and the valve spool is firmly connected with the valve rod.

The invention provides a craniotomy dura mater suspension drilling protection device which solves the problems that existing drilling equipment is insufficient in stability, and a drilling outlet is difficult to determine. Comprising a transverse shaft, supporting frames are arranged on the left side and the right side of the transverse shaft respectively, supporting plates are hinged to the supporting frames through connecting bases, and a shell is arranged between the two supporting frames; an adjusting disc is rotationally connected into the shell, plane threads are arranged on the adjusting disc, a cover plate is rotationally connected to the shell, a guide groove is formed in the cover plate, and drilling supports are arranged on the left side and the right side of the adjusting disc respectively. The drilling support comprises a base body, a support body, a guide frame and a telescopic rod. The base body comprises a cylinder and a baffle, and a conical protruding head is arranged on the baffle. An avoiding groove is formed in the frame body; drill bushings are arranged at the lower ends of the guide frames; and the guide frame and the cylinder as well as the connecting seat and the support frame are respectively connected through displacement adjusting mechanisms with the same structure.

A bridge plug having a large drift diameter comprises: an upper joint (1), a central pipe (7), a guide shoe head (12), and a bridge plug assembly; the upper joint and the guide shoe head are annular, the upper joint fixedly sleeves an outer side of one end of the central pipe, the guide shoe head fixedly sleeves the outer side of the other end of the central pipe, the bridge plug assembly sleeves the outer side of a middle section of the central pipe and is located between the upper joint and the guide shoe head, an apparatus for fixedly connecting to a pull rod(16) sleeved within the bridge plug is disposed on the guide shoe head, a soluble sphere base is disposed at the end of the central pipe proximal to the upper joint, and the central pipe is a drillable metal unit. The present invention also relates to a setting method of the bridge plug having a large drift diameter. The bridge plug having the large drift diameter eliminates a drilling and grinding step of the bridge plug and avoids the problems of a long construction time period, a high operation cost, and a large construction risk caused by the drilling and grinding step, such that the bridge plug is easier to use and faster to construct.

The invention discloses an ecological restoration device for acid soil in a mining area. The ecological restoration device comprises a restoration base, a power column and a stabilizing column are arranged on the upper portion of the restoration base, and a lifting plate is arranged between the power column and the stabilizing column; a lifting motor is arranged on the lower portion of the lifting plate, an output shaft of the lifting motor is connected with an assembly part, and a spiral lifting blade is detachably installed on the assembly part. A positive and negative rotation motor is started, a driving bevel gear rotates, a driven bevel gear rotates, a power rotating shaft rotates, a threaded area rotates, the threaded area is in threaded connection with a screw block, the screw block moves to drive a through rod to move, and then a lifting plate is driven to move; the stabilizing column is sleeved with a stabilizing sleeve, and the stabilizing sleeve moves, so that the moving stability of the lifting plate is improved; by driving the spiral lifting blade to move downwards and starting the lifting motor at the same time, the spiral lifting blade can be conveniently drilled out, then soil is dug out, sampling is facilitated, and the working efficiency is improved compared with manual work.