47 results about "Trepanning" patented technology

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 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 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 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 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 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 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.

The utility model discloses a work fixture, which is used for clamping and locking a workpiece so as to facilitate trepanning of the workpiece, and comprises a fixture base, a clamping component and paired fixing plates, the clamp base is fixedly arranged between the paired fixing plates, the clamping assembly is detachably arranged on the clamp base, and a workpiece to be tapped can be placed on the clamp base in a multi-angle mode and can abut against the portion between the clamping assembly and the fixing plates. According to the tool clamp, the clamp base and the clamping assembly are arranged in a matched mode, so that the tool clamp can fix multiple pairs of workpieces at the same time, the multiple pairs of workpieces can be fixed to the clamp base through the clamping assembly at different drilling angles, and therefore the tool clamp can achieve multi-angle drilling of the multiple workpieces; and the drilling efficiency of the machine tool applying the tool clamp is further improved.

The utility model relates to the technical field of wall trepanning, and discloses wall trepanning equipment which comprises a bottom plate, two supporting plates are fixedly connected to the top side of the bottom plate, two supporting sleeves are slidably connected to the outer sides of the two supporting plates in a sleeving mode, and supporting rings are slidably connected to the outer sides of the two supporting sleeves. The supporting plate, the supporting sleeve and the supporting ring are arranged, the height position of the supporting ring is manually adjusted, the height position of the drill bit can be synchronously adjusted along with adjustment of the position of the supporting ring, when punching operation needs to be conducted on a high position, the height position of the supporting sleeve is manually adjusted, and by means of adjustment of the double height positions, punching operation is more convenient. According to the drilling device, the drill bit can conduct drilling operation on the high position, meanwhile, in the drilling process, multiple components are limited mutually, the hole channel deviation caused by shaking during drilling of the drill bit can be avoided, and therefore the vertical accuracy of the drilling hole channel is effectively improved, and limitation is reduced.

The utility model discloses a part manufacturing trepanning device which comprises a fixing bottom plate, fixing holes are formed in the four corners of the fixing bottom plate, a supporting frame is fixedly connected to the top end of the fixing bottom plate, a supporting column is fixedly connected between the bottom end of the supporting frame and the fixing bottom plate, and a containing table is fixedly connected to the top end of the fixing bottom plate. A discharging hole is formed in the top end of the containing table, and a discharging groove is formed in the front side of the containing table. The trepanning knife rest assembly is arranged on the outer side of the supporting column; the positioning assembly is arranged on the outer side of the supporting column; and the hydraulic rod is fixedly connected to the bottom end of the supporting frame. Compared with the prior art, the hole opening cutter has the advantages that the corresponding hole opening cutter can be rapidly adjusted according to the hole opening diameter requirement, and operation is faster and more convenient.

The utility model discloses a trepanning tool which comprises a support, a module and a telescopic piece, a pair of inclined faces are arranged at the top of the module, machining holes are formed in the inclined faces, one end of the module is hinged to the top end of the support and provided with a pair of angle holes, the angle holes correspond to the inclined faces one to one, and a containing groove is formed in the other end of the module and matched with a damper. The telescopic piece is connected with the side wall of the support, the telescopic piece is used for being inserted into any angle hole and enabling the corresponding inclined face to be in a horizontal state, a fixing structure of the damper is formed through the arrangement of the containing groove, and then the damper can confirm the machining angle of the inclined face through the angle hole through the arrangement of the inclined face, the machining hole, the angle hole and the telescopic piece; and multiple sets of tools are not needed for clamping, so that the machining cost is effectively reduced, and the machining efficiency is improved.

The utility model provides a ladder for ventilation support in a deep and narrow archaeological environment, which belongs to the technical field of support instruments, and comprises a first double vertical rod, an expansion mechanism is arranged on a rod body of the first double vertical rod, the expansion mechanism comprises a first sleeve frame, a telescopic rod, a double-shaft cylinder and a second sleeve frame, the first sleeve frame is sleeved and fixed on the rod body of the first double vertical rod, and the telescopic rod is sleeved and fixed on the second sleeve frame. The trepanning steps, the solid steps and the cavity steps are alternately arranged between the opposite faces of the first sleeve frame from top to bottom, the telescopic rods are inserted into the side portions of the trepanning steps, the double-shaft air cylinders are arranged in the cavity steps, and the second sleeve frame is fixedly connected to the ends of the telescopic rods. By arranging the expansion mechanism, the ladder with a single structure can be conveniently and transversely expanded on the two sides, the ladder can be firmly supported on the two sides of a pit wall through transverse expansion, a more stable climbing platform is provided, and the ladder capable of being transversely expanded can be contracted to a smaller size when not used, so that the ladder is convenient to carry and transport.

The invention relates to the field of pressure vessel trepanning, and discloses pressure vessel barrel trepanning equipment which comprises a bottom plate. Two lifting assemblies; two conversion assemblies; a lifting assembly; a cylinder; a lifting assembly; and a punching assembly and a positioning assembly. When a tooth block drives a first tooth plate to descend and pulls a second gear to rotate anticlockwise, the second tooth plate can be stressed upwards, an arc-shaped block drives a cylinder to move upwards, meanwhile, when the tooth block vertically faces downwards, the first gears on the left side and the right side can be driven to symmetrically rotate and move downwards, and at the moment, the two first gears can pull a first movable piece to move downwards; when the cylinder is lifted by the arc-shaped block, the two clamping hands hinged to the first movable piece can rotate inwards under the limiting of the second movable piece and clamp the outer edge of the cylinder lifted by the arc-shaped block, at the moment, the cylinder is clamped by the supporting rods on the left side and the right side and is lifted by the bottom, and the problems that the drilling degree of a drill bit is difficult to observe in a traditional clamping method; and metal scraps generated during drilling cannot be cleaned in time.

The utility model discloses a tapping device for assisting in detecting the solid strength of structural concrete, which comprises a disc seat detachably connected to the end part of a drill rod of a water drilling machine; a connecting hole is formed in one end of the disc seat, and a threaded hole is formed in the center of the disc seat; a first drill bit and a second drill bit are arranged at the other end of the disc seat and are concentrically arranged; the diameter of the first drill bit is more than 1.6 times that of the second drill bit, and the length of the first drill bit is smaller than that of the second drill bit. The tapping device for assisting the strength detection of the structural concrete entity is reasonable in structure and convenient to operate, and is used for processing an annular groove hole so as to obtain counter-force support for the strength detection of the structural concrete and ensure the test accuracy.

The utility model belongs to the technical field of building template trepanning, and particularly relates to a building template adjustable trepanning device which comprises a rotating shaft, one end of the rotating shaft is connected with a first grip, the first grip is provided with a first motor, the first motor is connected with the rotating shaft through a first gear transmission mechanism, and the other end of the rotating shaft is provided with a drill bit. The sleeve is sleeved with a second handle, the second handle is provided with a second motor, the second motor is connected with a saw blade installation base through a second gear transmission mechanism, the saw blade installation base is provided with a telescopic sleeve in the radial direction, one end of the telescopic sleeve is connected with the saw blade installation base, the other end of the telescopic sleeve is connected with a saw blade, and the telescopic sleeve is provided with a locking component for locking the length of the telescopic sleeve. Through the arrangement of the saw blade mounting seat, the telescopic sleeve and the saw blade in the telescopic sleeve, the diameter of the tapper can be changed at will under the condition that the tapper is not replaced, so that tapping is carried out.