59 results about "Trepanning" patented technology

The utility model relates to the field of open blasting, and discloses a broken zone drilling machine trepanning stage hole protecting device which comprises a pipe body A and a pipe body B. Grouting openings are formed in the surfaces of the pipe body A and the pipe body B, positioning grooves are formed in the top ends of the outer walls of the pipe body A and the pipe body B, three sets of positioning blocks are fixedly connected to the outer side wall of the pipe body B, and the outer side wall of the pipe body B is fixedly connected with the positioning grooves. A grouting mechanism is arranged on the inner wall of the pipe body A, positioning mechanisms are arranged at the bottom ends of the outer walls of the pipe body A and the pipe body B, the inner wall of a sliding block is elastically connected with a triangular block through a reset spring, each positioning mechanism comprises a positioning ring, and the inner wall of each positioning ring is elastically connected with a wedge block through a limiting spring. According to the utility model, through the arrangement of the positioning mechanism, the pipe body A and the pipe body B are assembled and then are quickly spliced and connected, so that adjustment can be carried out according to the drilling depth of a rock layer to support and fix a blast hole.

The invention discloses a minimally invasive bone circumcision drill kit and a using method.The minimally invasive bone circumcision drill kit comprises a tapper and a bone fetcher, an annular drill and a centering drill bit which are coaxial are arranged at the working end of the tapper, and the centering drill bit is arranged in the center of the annular drill; the front end of the centering drill bit protrudes out of the end face of a cutting edge of the annular drill; and the diameter of the bone taking rod at the working end of the bone taking device is smaller than that of the centering drill bit. According to the invention, the annular drill with the centering drill bit is adopted to carry out trepanning on the outer-layer hard bone at the bone taking position, so that the outer-layer hard bone sheet can be completely taken down and then backfilled, and the rapid recovery of a wound is facilitated.

The utility model relates to an outdoor gas pipeline deflation device which comprises a sealing sleeve, a drilling mechanism and a hoop used for being fixed to a gas pipeline, a connector is arranged on the hoop, and one end of the sealing sleeve is connected with the connector. The drilling mechanism comprises a drill rod and a tapper or a drill bit used for tapping, the drill rod is arranged on the sealing sleeve in a penetrating mode, and one end of the drill rod is connected with the tapper or the drill bit; a sealing piece is arranged between the sealing sleeve and the drill rod, and a deflation valve is arranged on the sealing sleeve. The outdoor gas pipeline deflation device has the advantages that the hoop is fixed to the gas pipeline, the tapper penetrates through the connector to open a hole, and the hole opening position can be accurate; the deflation valve is communicated with the interior of the sealing sleeve, and gas in the sealing sleeve can be controlled to be exhausted outwards by opening the deflation valve; in the state that the hoop and the gas pipeline are assembled, the sealing sleeve and the hoop are integrally sealed, a worker can control the discharge amount of gas through the deflation valve, and safety is improved.

The utility model provides a wall surface trepanning device, which belongs to the field of engineering, and comprises a cylinder body, an electric telescopic rod is arranged at one end of the inner wall of the cylinder body, the telescopic end of the electric telescopic rod is fixedly connected with a motor through a protection assembly, a fixing ring is arranged on the surface of one end of the cylinder body, and a first annular groove is formed in the surface of the fixing ring. A positioning assembly is arranged on the inner wall of the first annular groove. An electric telescopic rod drives a moving plate to move, and when the moving plate is matched with a motor to drive a drilling shaft to drill holes in a wall face, counter-acting force brought by the wall face drives the moving plate to move to different degrees on the surfaces of a plurality of guide rods in a second annular groove; and a moving plate is matched with a second annular groove and a plurality of moving rings to extrude a plurality of first springs, so that the borne counter-acting force is counteracted, and the damage to the structure of the device is avoided.

The invention discloses a pipeline under-pressure head collision device and method, which are used for removing a sealing plate for sealing a port of an under-pressure pipe, so that the port of the under-pressure pipe is communicated with a valve, the head collision device comprises a trepanning drill bit and a containing cavity, the caliber of the trepanning drill bit is smaller than that of the port of the under-pressure pipe and that of the maximum opening of the valve, and the containing cavity is used for containing the trepanning drill bit. The containing cavity is provided with a communication port detachably connected with a first port of the valve, so that the first port of the valve is closed, the trepanning drill bit is controlled by a rotating device to rotate, and the trepanning drill bit is controlled by a telescopic device to stretch out and draw back relative to the containing cavity. And therefore, when the opening drill bit extends out, the opening drill bit can penetrate through the valve to reach the sealing plate, or the opening drill bit retracts into the containing cavity. Pipeline communication can be completed in the pipeline running state, no pipeline needs to be stopped, operation is easy, manpower and material resources are saved, and field production is guaranteed.

The utility model discloses a fireproof coating thickness measurement auxiliary tapping tool which comprises a pressing plate, an insertion nail and a sleeve, the insertion nail is arranged on one side of the pressing plate, a channel is formed in the sleeve, and the channel is matched with the insertion nail, so that the insertion nail extends out of the sleeve along the channel. The problem that the thickness needle is difficult to insert into the coating for detection is solved, so that the situation that the thickness needle is abraded due to the fact that the thickness needle touches the base body can be avoided, the detection efficiency is improved, and the detection cost is reduced; and moreover, the accuracy of detection data can be effectively improved, so that the precision of a detection result and the practicability of the device are improved. Meanwhile, the auxiliary trepanning tool is convenient to manufacture, low in cost and easy to master.

The utility model discloses a novel perforating machine which comprises a machine frame, and a needle seat and a perforating assembly are arranged on the machine frame. The tapping assembly comprises an adjusting plate, and a punching needle is further arranged on the adjusting plate. A needle head is arranged on the punching needle, and a strip-shaped groove connected and communicated with the interior of the needle head is further formed in the punching needle in the radial direction. In conclusion, when the punching needle of the equipment is used for punching, one end of the needle head is directly extruded on the needle seat, which is similar to cutting vegetables on a chopping board by a kitchen knife, so that the punching needle has the advantages of being clean and neat, neat in cut and the like, and the phenomena of burrs on the inner wall surface of a hole site or incomplete cutting can be effectively reduced. Particularly, due to the fact that the strip-shaped groove is formed in the punching needle in the radial direction, waste materials can be rapidly discharged through the strip-shaped groove after the needle head enters the punching needle, and punching efficiency is improved.

1. The name of the design product: the main body of the trepanning device (three holes). 2. The use of the design product: the overall design product is a trepanning device, which is a kind of electric tool accessory used for plate trepanning; the local part is the main body of the trepanning device, which is used for heat dissipation and chip removal during the trepanning process. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view. 5. Other circumstances that need to be explained: the design belongs to partial protection design, the protected part is the main body of the trepanning device, that is, the area covered by the gray translucent layer is protected by partial appearance design, and the unprotected part is covered by the gray translucent layer.

The utility model relates to the technical field of tappers, and provides a tapper convenient to clean, which comprises a cutting shell and a positioning drill, the cutting shell is provided with a cutting opening and a connecting seat used for being matched with the positioning drill, the cutting opening and the connecting seat are respectively positioned at two ends of the cutting shell, and a cleaning disc is arranged in the cutting shell. The cleaning disc is provided with a matching hole for the positioning drill to penetrate through, the cleaning disc is connected with the cutting shell in a sliding mode, an elastic piece is arranged between the end, close to the connecting base, of the cleaning disc and the cutting shell, and preferably, the inner diameter of the cutting shell is 5 mm, and the cutting depth is 5 mm. According to the technical scheme, the problem that in the related technology, the hand of the human body needs to stretch into the cutting shell to take out the residual material core is solved, and the cleaning efficiency of the tapper is improved.

The utility model discloses a receipt arrangement binding tapper which comprises a base, a connecting frame is arranged at the top of the base, a sliding rod is arranged at the top of the connecting frame, a spring is arranged on the outer side of the sliding rod, a movable plate is arranged at the bottom of the sliding rod, and a plurality of sets of tapping needles are arranged at the bottom of the movable plate. Under the cooperation of the roller, the hinge frame, the movable plate, the spring, the sliding rod and the perforating needle, before the perforating process of the receipt, the surface of the receipt can be leveled through downward moving force in the perforating process, wrinkles of the receipt before perforating are avoided, then the receipt is directly perforated after being leveled, the perforating efficiency is further guaranteed, and the perforating efficiency is improved. And meanwhile, under the cooperation of a hinge rod, a connecting plate, a push plate, a rotary disc and a leveling plate, the edge positions of the multiple receipts can be pushed to be aligned before punching, and the situation that the positions of holes of the receipts are affected due to the fact that the receipts are not flatly placed is avoided.

The utility model discloses an automatic pressure stabilizing device of a hydrogen circulation compressor, which comprises a support plate fixedly connected to the rear side of an automatic pressure stabilizer, the top of the support plate is fixedly connected with a trepanning positioning plate, the rear side of the trepanning positioning plate is provided with a round hole, the top of the trepanning positioning plate is communicated with a threaded pipe, and the threaded pipe is connected with the support plate. According to the utility model, the round head is screwed to drive the threaded nail to rotate, and under the action of the threaded pipe, the threaded nail pushes the downward pressing limiting piece to slide downwards and press a connecting line downwards, so that the connecting line is connected with the threaded pipe, and the threaded pipe is screwed to drive the threaded nail to rotate. The connecting line can be supported through the cooperation of the push supporting piece and the spring, so that the connecting line and the wiring end of the automatic voltage stabilizer can be reinforced, and the purpose that the connecting line and the automatic voltage stabilizer are prevented from falling off due to shaking of the hydrogen circulating compressor is avoided.

The utility model relates to the technical field of indoor decoration, and discloses a precise trepanning positioning and fixing device which comprises a suction cup, an adjusting seat and a connecting rod used for connecting the suction cup and the adjusting seat, the top of the suction cup is fixedly connected with a supporting seat, and the connecting rod penetrates through one end of the supporting seat. First fixing nuts are arranged on the upper surface and the lower surface of the supporting base correspondingly, and the two first fixing nuts are in threaded connection with the bottom of the connecting rod and used for fixing the relative position of the connecting rod and the supporting base. According to the accurate punching positioning and fixing device, an existing electric hand drill can be clamped and fixed through the matched arrangement of the adjusting base and the fixing mechanism, the position of the adjusting base can be fixed through the suction cup during punching through the matched arrangement of the adjusting base, the connecting rod, the suction cup and the supporting base, and the positioning and fixing effect is good. Therefore, the position of the electric hand drill is fixed, and the possibility that the electric hand drill inclines and shakes in the punching process is reduced.

The utility model relates to the technical field of trepanning equipment, and discloses a pressure vessel trepanning device which comprises a base and an adjusting shaft rod arranged at the top of the base, a control seat is sleeved outside the adjusting shaft rod, trepanning equipment is arranged at the bottom of the control seat, and a hydraulic assembly capable of controlling the trepanning equipment up and down is arranged on one side of the control seat. In the utility model, the container can be placed in the base, the control seat outside the adjusting shaft lever is firstly subjected to radial sliding adjustment, the control seat is fixed through the fixing nut so as to firstly determine the position of a hole, and the whole adjusting shaft lever can horizontally rotate in the second sliding chute at the top of the base through the sliding piece II; the opening position of the container is further limited by the control seat outside the adjusting shaft rod, and the adjusting shaft rod is limited and fixed by the screw ring outside the second screw shaft, so that the control seat can be switched and positioned at any angle position through the adjusting shaft rod and the base, and the effect of improving the use practicability of the control seat is achieved.

The utility model relates to the field of drilling, in particular to a tapping device for lower end plate iron core machining, which comprises a bottom plate, a conveyor belt, a mounting groove, a lifting column, a connecting rod and a cam, a mounting block is fixed at the upper end of the bottom plate through a mounting frame, the conveyor belt is arranged on the outer wall of the mounting block, and a groove is formed in the surface of the conveyor belt. A cam is rotatably mounted on one side of the mounting block, a mounting groove is fixed to the middle of the bottom plate, a liftable lifting column is arranged in the mounting groove, a fixing frame is fixed to the outer wall of one side of the mounting groove, and a connecting rod is rotatably mounted on one side of the fixing frame. According to the device, the effects of drill bit falling and lifting and object stepping are achieved in a stable mechanical linkage mode, and the problem that an existing tapping device for lower end plate iron core machining lacks a stable mechanical linkage structure design to participate in the stepping type batch iron core drilling effect is solved; and a control system and a plurality of sensors need to participate in cooperative use, so that the error probability of the device is increased.

The utility model relates to medical instrument processing technical field, concretely relates to a three cavity pipe positioning pin hole clamp, include: positioning subassembly, three cavity pipe, two cutting knife device and fixed base, wherein, positioning subassembly includes: positioning pipe, two positioning steel wires and clamping assembly, wherein, positioning pipe fixedly set up on fixed base, positioning pipe has the closed limiting end and open insertion end, three cavity pipe is placed in the cavity of positioning pipe through insertion end, and clamping assembly fixedly sets up on the wall surface of insertion end, the side wall of positioning pipe is successively provided with limiting observation port, inflation incision and liquid injection incision from limiting end to insertion end, two cutting knife devices are arranged at corresponding inflation incision and corresponding liquid injection incision respectively, the utility model solves the problem that traditional manual pin hole efficiency is low, and the risk is high, and the quality and production efficiency of three cavity pipe trepanning are improved greatly.

The invention relates to the technical field of inspection well punching, in particular to an inspection well step positioning punching tool which comprises a movable support, a hole aligning support and a punching instrument. The movable support is movably arranged on an opening in the top end of a tubular inspection well in a sleeving mode; the hole aligning bracket corresponds to three pairs of mounting hole groups which are distributed in an equilateral triangle shape on the inner wall of the inspection well; the trepanning instrument is used for forming a mounting hole group and a stress release hole group in the inner wall of the inspection well; and the stability maintaining mechanism is arranged on the movable support. The upper hole-aligning I-shaped pipe fitting and the lower hole-aligning I-shaped pipe fitting which are symmetrical up and down are arranged through the bearing longitudinal rod, stress release grooves which are distributed at equal intervals in the circumferential direction are formed in the inner wall of the inspection well through the grooving device corresponding to the hole-aligning support, and then stress release holes which are distributed with the stress release grooves at intervals are formed through the drilling device; and an ice water pipeline with a cooling and cold compressing effect and propylene glycol coolant are filled in the inner wall of the inspection well so as to carry out cooling and wet protection on the part, where the mounting hole group is formed, of the inner wall of the inspection well.

The utility model provides a trepanning tool which comprises a mounting base assembly fixed to the circle center of a to-be-cut piece. The fixing assembly comprises a first fixing structure and a second fixing structure, the first fixing structure is rotatably connected with the side, away from the to-be-cut piece, of the mounting base assembly, the second fixing structure is rotatably connected with the first fixing structure, and the rotating axis of the second fixing structure is perpendicular to the rotating axis of the first fixing structure; the gas cutting assembly is connected with the second fixing structure and is perpendicular to the rotating axis of the second fixing structure. According to the technical scheme, the problem that in the prior art, in the plate gas cutting tapping process, the machining precision is low is effectively solved.

The utility model belongs to the technical field of machining, and particularly relates to a positioning tool and a trepanning device, the positioning tool is used for positioning a target workpiece, the positioning tool comprises a base, a positioning block detachably installed on the base and a pressing structure arranged above the positioning block, the positioning block is provided with a positioning face used for supporting the target workpiece, the positioning face is matched with the bottom face of the target workpiece in shape so as to position the target workpiece, and the pressing structure is used for clamping the target workpiece together with the positioning face. The positioning tool can solve the problem of how to improve the positioning stability of a target workpiece and the universality of the positioning tool.

The invention provides a tapper, and belongs to the technical field of machinery. The problem that in order to achieve cooling, the tapping precision becomes poor is solved. The tapper comprises a cylindrical body with the lower portion open, a cutting portion is arranged at the lower end of the body, a connecting piece is fixedly connected into the body, the connecting piece is in a cylindrical shape with the lower portion open, the connecting piece is higher than the cutting portion, the peripheral side of the lower end of the connecting piece is sleeved with a sealing ring, and the outer edge of the sealing ring abuts against the inner wall of the body. A cooling cavity used for storing a cooling medium is formed among the outer wall of the connecting piece, the inner wall of the body and the sealing ring, and an injection hole communicated with the cooling cavity is formed in the body. The invention has the advantages of light weight, high tapping precision and the like while ensuring the cooling effect.

The trepanning machine needle comprises the needle head and a needle rod, a sharp portion used for penetrating through cloth is arranged on the lower end face of the needle head, a plurality of knife edge portions are arranged on the sharp portion, the knife edge portions are arranged on the periphery of the sharp portion, grooves are formed by the knife edge portions and the sharp portion, and the needle head is detachably connected with the needle rod. The needle head is provided with an inclined groove used for discharging scraps, the upper end face of the needle head is provided with a connecting rod, the outer wall of the connecting rod is symmetrically provided with fixing grooves, protruding blocks are arranged in the fixing grooves, springs are arranged between the protruding blocks and the fixing grooves, one ends of the springs are connected with the inner walls in the fixing grooves, and the other ends of the springs are connected with the protruding blocks. Compared with the prior art, the needle head and the needle rod are detachably connected, when the needle head is abraded and needs to be scrapped, only the needle head needs to be detached, a new needle head needs to be replaced, and cost is greatly saved.

The utility model relates to the technical field of trepanning machines, in particular to a trepanning machine with a positioning function, which comprises a trepanning component and a first sliding block, the first sliding block is arranged above a positioning component and horizontally moves under the driving of a moving component, and a first sliding groove is horizontally formed in the lower surface of the first sliding block. The length direction of the first sliding groove is perpendicular to the moving direction of the first sliding block, the second sliding block is arranged in the first sliding groove and is driven by the displacement assembly to move in the direction parallel to the length direction of the first sliding groove, the mounting box is connected with the lower surface of the second sliding block through a first hydraulic cylinder, and the lower end of the mounting box is connected with the pressing plate through the telescopic assembly. A dust suction cover is arranged at the lower end of the pressing plate and connected with the dust removal assembly through a dust suction pipe, the first motor is arranged in the mounting box, a drill bit is arranged at the power output end of the first motor, and the lower end of the drill bit penetrates through the bottom of the mounting box and the pressing plate and then extends into the dust suction cover. The punching device has the advantages of punching holes in different positions and the like.

The invention relates to the technical field of keloid resection, and discloses a multi-bit minimally invasive surgery device for keloid trephine resection, which comprises a handle, and further comprises a rotating disc rotationally mounted at the front end of the handle; the cylinder grooves are annularly and uniformly formed in the rotating disc; a connecting cylinder is movably inserted into each cylinder groove, a ring drill bit is arranged at the first end of each connecting cylinder, and the second end of each connecting cylinder is detachably connected with the inner shaft; the inner shaft is movably and telescopically arranged in the handle and can freely rotate; according to the multi-drill-bit minimally invasive surgery device for keloid trephine resection, the rotating disc is arranged at the front end of the handle, and the multiple barrel grooves are annularly and evenly distributed in the rotating disc to integrate trephine bits with different diameters, so that an operator can rapidly select and switch the matched trephine bits in the same minimally invasive surgery process; therefore, the adaptive capacity of the device to keloids with different sizes and shapes is improved, and the replacement frequency of instruments in an operation is reduced.

The utility model relates to the technical field of fire-fighting pipeline construction, in particular to fire-fighting pipeline accurate tapping equipment which comprises an equipment platform, a pair of vice is fixedly connected in the equipment platform, a vice valve is arranged on the vice and can adjust opening and closing of the vice, and a jaw of the vice is in an arc shape and is provided with a tooth structure. A plurality of sliding supports are further arranged in the equipment platform, the sliding supports and the vice are linearly arranged, the top end of the equipment platform is slidably connected with a trepanning device, the trepanning device comprises a sliding seat, a drilling part is slidably connected to the sliding seat, a control rotating wheel is rotatably connected to the sliding seat, a gear is arranged on the control rotating wheel, and a rack is arranged on the drilling part. The gear is in meshed connection with the rack, one end of the equipment platform is fixedly connected with the positioning plate, the tapping device is positioned through the positioning plate and the scales and is kept stable under fixation of the vice, the drilling bit is controlled by the tapping device to move up and down for tapping, the hole position is accurate, the tapping speed is high, and the tapping efficiency is high.

The utility model discloses a high-pressure PE pipe perforating machine, which relates to the technical field of pipeline production, comprises a machine table base, and is characterized in that an automatic conveying structure, a drilling structure, a polishing structure and an automatic conveying structure are arranged above the machine table base, and the automatic conveying structure, the drilling structure and the polishing structure are arranged above the machine table base. A positioning structure is mounted above the machine table base, and a retention structure is mounted above the machine table base; through the arrangement of the positioning structure and the drilling structure which have a plurality of trepanning positioning effects, the multi-hole drilling machine can perform trepanning work at multiple positions at the same time, polishing treatment can be performed after trepanning is completed, trepanning damage caused by rubbing feeling at the trepanning position is reduced, and meanwhile, the production efficiency is improved. And the positioning structure is a structure for detecting the distance from the entering end of the PE pipe to the hole opening position, so that the positioning distance can be accurately received for accurate positioning and hole opening.

The invention relates to a material cutting device for a surgical positioning patch, and the device comprises a cabin which is constructed to be provided with a first cabin for accommodating the positioning patch; the trepanning cutter is arranged at the top of the cabin; the sheet cutter is arranged at the bottom of the first cabin; the storage tray is used for placing the positioning stickers and sending the positioning stickers into the first cabin; the trepanning knife can move up and down relative to the storage tray, a through hole is formed in the positioning patch when the trepanning knife descends, the sheet-shaped cutter is driven to be inserted into the through hole when the trepanning knife ascends, and a notch is formed in the positioning patch by the sheet-shaped cutter when the storage tray is moved out of the first cabin; according to the automatic cutting device for the positioning patches, cutting of notch shapes in the positioning patches can be automatically completed, manual operation is not needed, cutting of the multiple positioning patches can be completed at a time, then the operation steps are greatly simplified, the time-saving and labor-saving effect is achieved, and operation is greatly facilitated.

The engineering plastic pipe trepanning positioning device comprises a positioning mechanism, a bandage and a measuring scale, and the measuring scale is located at the edge of the end face of one side of the positioning mechanism; an output port is formed in the edge of the bottom end of one side of the positioning mechanism, and the bandage is inserted into the output port in a penetrating mode; the positioning mechanism comprises a winding mechanism and a first measuring mechanism, one end of the bandage surrounds the winding mechanism, the first measuring mechanism is located on one side of the winding mechanism, the surface of the bandage is attached to the outer portion of the first measuring mechanism, and the first measuring mechanism measures the moving length of the bandage. According to the invention, holes with specific included angles on the same pipeline can be positioned, the problem of angle measurement of the pipeline before trepanning operation is solved, the positions of the holes are more accurate, and the requirements of practical application are met.

The utility model relates to the technical field of degassing screws, and provides a box body for a degassing screw, which comprises a cavity, a sealing cover, a barrel and a cavity wall, the cavity is provided with an opening, the sealing cover is detachably arranged on the cavity and used for sealing the opening, the cavity wall is arranged in the cavity, the two ends of the barrel penetrate through the cavity, and a plurality of opening areas are arranged on the side wall of the barrel in the circumferential direction. A plurality of through holes are formed in the side wall of the trepanning area of the cylinder body, the filter plate is arranged in the cavity and used for covering the trepanning area of the cylinder body, the cavity body is further provided with an extraction opening, and the extraction opening is used for installing an extraction pipeline. According to the technical scheme, the problem that the filter plate is difficult to replace in the prior art is solved.

The invention provides a hydraulic support main rib plate multi-hole one-time efficient boring device and process, and relates to the technical field of boring equipment. According to the device and the process, the initial coordinate position of the main rib plate is determined through the positioning mechanism, the main rib plate is photographed through the visual identification unit, the size and the position of the main rib plate are accurately identified, and the control unit matches the photo of the main rib plate with the template to generate the to-be-bored position of the main rib plate; the control unit controls all the moving mechanisms to drive the boring cutter assembly to act on the to-be-bored position of the main rib plate along the set path, the boring cutter assembly acts on the main rib plate to complete boring operation, and high-efficiency and high-precision positioning trepanning of multi-hole one-time boring is achieved. The steps of manual scribing, positioning and clamping are omitted, so that the problem of follow-up assembly difficulty caused by low precision of manual scribing and inconsistent boring positions at present is solved, the position precision and aperture precision among multiple holes and the boring efficiency of the porous main rib plate are improved, and high precision, high efficiency and high reliability of the boring process are guaranteed.

The utility model provides a foam mold trepanning tool which comprises a sleeve concentrically connected with the output end of an electric tool; the abutting seat is concentrically connected with the sleeve, and a center hole is formed in the center; the diameter of the central hole is equal to the inner diameter of the sleeve; and the transmission rod is sleeved in the central holes of the sleeve and the abutting seat, a positioning cover is sleeved on the transmission rod, and one end far away from the electric tool is connected with a blade. The depth of the counter bore is determined by setting the distance between the blade and the abutting seat in advance, the counter bore with the depth meeting the design requirement is obtained by directly abutting the positioning cover and the abutting seat at a time during trepanning operation, and therefore repeated trepanning operation of the counter bore is avoided, and the trepanning operation of the counter bore is rapidly and efficiently completed.

The invention relates to a hole machining process. The hole machining process comprises the following steps of hole rough machining, wherein a first through hole is roughly machined in a product; and hole finish machining is conducted, specifically, a reverse hook cutter penetrates through the first through hole, the diameter of the first through hole is expanded in the direction from the outlet side of the first through hole to the inlet side of the first through hole, and therefore a second through hole subjected to finish machining is formed. Through two times of trepanning processes, firstly, the first through hole with the small hole diameter is roughly machined, then the hole wall of the first through hole is cut from the outlet side to the inlet side through the reverse hooking tool, and the second through hole with the hole diameter larger than that of the first through hole is formed; the problem that burrs are formed on the outlet side due to insufficient supporting rigidity can be effectively avoided.