63 results about "Hole opener" patented technology

The utility model discloses a tapper connecting rod which comprises a rotating handle assembly and a tapping assembly, the rotating handle assembly comprises a drill bit limiting sleeve and a limiting mechanism, the tapping assembly comprises a quick conversion head, a positioning drill bit and a cylindrical tapper, and the limiting mechanism comprises a limiting steel ball and a sliding sleeve; a first limiting hole is formed in the drill bit limiting sleeve, the limiting steel ball is installed in the first limiting hole in a matched mode, a first positioning groove is formed in the lower end of the quick conversion head, and the limiting steel ball and the first positioning groove are matched for limiting. A first limiting part and a second limiting part are arranged on the inner side wall of the sliding sleeve, and the sliding sleeve moves in the axial direction of the drill bit limiting sleeve, so that the first limiting part and the second limiting part are matched with the limiting steel balls correspondingly, and the drill bit limiting sleeve and the quick conversion head are locked or unlocked; the positioning drill bit and the cylindrical tapper can be easily detached and pulled out, and the purpose of rapidly withdrawing waste materials or rapidly replacing the cylindrical tapper is achieved.

The utility model discloses a woodworking tapper capable of removing chips smoothly, which relates to the technical field of chip removal of tappers, and comprises a cylindrical cover body and a connecting shaft, a drill bit is arranged below the connecting shaft, a piston plate and a micro hollow baffle are sequentially arranged on the inner side of the cylindrical cover body from top to bottom, and the micro hollow baffle is parallel to the piston plate. Guide rods are annularly and evenly arranged above the piston plate, a sliding sleeve is fixedly installed in the middle of the piston plate, a closed spiral groove is formed in the inner side face of the sliding sleeve, a sliding block is arranged on the drill bit and slidably connected into the spiral groove, a reset spring is connected to the outer side of the drill bit in a sleeving mode, and the reset spring and the micro-hollowed-out baffle are fixedly installed. Ventilation holes are annularly formed in the outer side of the cylindrical cover body. According to the scheme, chip removal of the woodworking tapper can be facilitated, the drilling position of the woodworking tapper can be automatically cooled in the drilling machining process of the woodworking tapper through starting of the electric drill, and the use effect of the woodworking tapper is further guaranteed.

The present invention provides a lifting device for horizontal members that allows for lifting and unlifting of horizontal members by attaching and detaching the lifting hooks to the horizontal member, which has a main surface without lifting fittings arranged horizontally. [Solution] The horizontal member lifting device 10 of the present invention comprises a lifting body 12 that can be lifted and transported by a crane, A hole saw 26 is attached to the lifting body 12 and extends toward a horizontally positioned horizontal member, on which one main surface of the lifting body sits, to drill a hole in the one main surface. The invention is characterized by having a locking mechanism 30 positioned around the rotation axis of the hole saw 26, in which, after drilling with the hole saw 26, the locking body 32, which is reduced in diameter toward the axis of the insertion hole as the hole saw 26 extends, is inserted from one main surface, and after penetration, the locking body 32 expands in diameter and locks onto the other main surface.

The guide sleeve tapper comprises a fixed sleeve, a sliding piece, a rotating piece and an elastic piece, the fixed sleeve is provided with a guide hole in sliding fit with the sliding piece, the sliding piece is provided with a first shaft hole with the axis parallel to the axis of the guide hole, the rotating piece is in rotating fit with the first shaft hole and slides synchronously with the sliding piece, and the elastic piece is arranged in the guide hole. The rotating piece is provided with a second shaft hole coaxial with the first shaft hole and a driven meshing part capable of being matched with a drill bit or an electric drill spindle, so that the rotating piece can synchronously rotate along with the drill bit, and the elastic piece can apply elastic force opposite to the feeding direction of the drill bit to the sliding piece. When the guide sleeve tapper or the jig is used for tapping, the drill bit is not in contact with the jig, so that the jig is not affected by abrasion during rotation of the drill bit, and when the drill bit moves downwards, the elastic piece can provide upward counter-acting force, so that the downward moving speed of the drill bit is better controlled, and the drilling precision is controlled.

This utility model relates to the field of hole saw technology, and more particularly to a hole saw with self-cleaning function. It includes a hole saw body, a guide rod, a push plate, a return spring, and a sliding mechanism. At least three guide holes are evenly distributed on the upper surface of the hole saw body. A guide rod is slidably disposed within each guide hole, with its direction parallel to the axial direction of the hole saw body. The bottom end of the guide rod is connected to a push plate, which is located within the hole saw body. A return spring is wound around the outside of the guide rod. The push plate can move under the action of the return spring to push out and clean debris from within the hole saw body. After the hole is drilled, the workpiece debris detaches from the workpiece. At this time, the push plate, under the action of the return spring, drives the contact plate and sliding plate to move, pushing the workpiece debris out of the hole saw body. This achieves a self-cleaning function, making the hole drilling operation simpler and faster.

The utility model provides a drilling device for pipeline connection, and particularly relates to the technical field of pipeline connection, the drilling device comprises a fixed seat, the top of the fixed seat is provided with a through groove, the top of the fixed seat is fixedly connected with a support frame, one side of the support frame is provided with a first limiting groove, the inner side of the first limiting groove is rotatably connected with a first screw rod, and the inner side of the first limiting groove is rotatably connected with a second screw rod. The drilling device comprises a first screw rod, one end of the first screw rod is provided with a first motor, the outer side of the first screw rod is in threaded connection with a connecting block, one side of the connecting block is fixedly connected with a second motor, and one end of an output shaft of the second motor is fixedly connected with a tapper. The first lead screw is driven to rotate, the second motor moves downwards, the tapper is driven by the second motor to rotate, and therefore the outer wall of the port of the metal pipeline is tapped.

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 belongs to the technical field of wall tapping tools, in particular to a wall tapper convenient for replacing a drill bit, which comprises a central drill bit and a circular hole saw, and further comprises a regular hexagonal fixing sleeve and a locking assembly, and the locking assembly comprises a locking pressing block, a fixing frame and a threaded column; a regular hexagonal fixing sleeve is fixed to the center drill bit, a regular hexagonal through hole allowing the regular hexagonal fixing sleeve to penetrate through is formed in the circular hole saw, a plurality of fixing frames are fixed to the circular hole saw at equal intervals in the circumferential direction, and threaded columns are installed on the fixing frames in a threaded screwing mode. According to the wall tapper, the regular hexagonal fixing sleeve penetrates through the regular hexagonal through hole to position the installation position of the center drill bit, the threaded column is rotated, the threaded column pushes the locking pressing block to be embedded into the locking groove to be locked under the screwing effect of threads, and the installation stability of the center drill bit is greatly improved; and meanwhile, the center drill bit is easy to disassemble and replace, and the use convenience is improved.

This invention relates to the field of soil environmental monitoring technology, and in particular discloses a sampling device for simultaneously collecting in-situ soil solutions and gases. The device comprises a support frame unit, a sampling device installed within the support frame unit, a drive device installed on the support frame unit, and a controller for controlling the drive device and the sampling device. The sampling device includes an aperture opener for drilling, a collector for simultaneously collecting soil solutions and gases from the drilled hole, and a gas-liquid separation unit for separating the collected solutions and gases. This device is a complete sampling system that not only reduces equipment costs and improves sampling efficiency, but also ensures the correlation and accuracy of synchronous, in-situ sampling data. By simultaneously, in-situ, and isolatedly collecting soil solutions and soil gases from the same borehole and at the same depth, it avoids cross-contamination and atmospheric interference, significantly improving sampling efficiency and data comparability, and providing a reliable technical means for research on multi-media soil environments.

The utility model discloses a glass rhinestone multi-angle trepanning device, which belongs to the technical field of glass trepanning, and comprises a positioning seat and a cylinder, the upper surface of the positioning seat is provided with a stroke groove, the outer surface of the cylinder is provided with a protection assembly, the upper surface of the positioning seat is provided with an adjusting assembly, and the adjusting assembly is provided with a positioning groove. An air blowing assembly is arranged on the side wall of the adjusting assembly; according to the glass drilling device, the protection assembly is arranged, along with extension of the air cylinder, the fixing plate drives the positioning plate to move synchronously through the positioning rod, so that the protection cover and the tapper are driven to move synchronously, at the moment, the protection cover covers the tapper, the polishing motor drives the tapper to rotate, and the tapper is used for drilling a glass rhinestone; and the protective cover covers dust generated during trepanning, so that the trepanning device automatically gathers the dust generated during trepanning, the dust generated during trepanning can be conveniently cleaned in the later period, and the working efficiency of the trepanning device is improved.

The invention provides a tapper, and belongs to the technical field of hardware tools. The technical problem that waste materials are inconvenient to discharge in an existing tapper is solved. The tapper comprises a tapping cylinder and a connecting rod, one end of the perforated cylinder is a cutting edge end, and the other end is a connecting end; a through hole communicated to the interior of the perforated cylinder is formed in the connecting end of the perforated cylinder; one end of the connecting rod is used for being connected with an electric drill, and the other end of the connecting rod is inserted into the through hole and is in circumferential limiting and axial sliding connection with the perforated cylinder; a limiting assembly used for limiting axial movement of the connecting rod in the through hole is further arranged on the trepanning cylinder. According to the tapper, waste embedded in the tapper can be conveniently, rapidly, stably and reliably discharged, the waste embedded tightly can be easily ejected out, and normal use of the tapper cannot be affected; in addition, the connecting rod can also play a role in limiting and positioning, so that the punching depth is accurately and reliably controlled.

The application belongs to the technical field of drilling, in particular to a drilling mechanical arm for underground engineering; the drilling mechanical arm comprises a rock drilling jumbo, a mechanical arm is installed on the rock drilling jumbo, a bracket is installed on the mechanical arm, a pushing beam is slidably installed on the bracket, a supporting plate is slidably installed on the left side of the pushing beam on a sliding rail, a rock drill is installed on the supporting plate, a drill rod is installed on the rock drill, a fixed plate is fixedly installed on the right end of the pushing beam, a first annular groove is formed in the through hole, an annular plate is rotatably installed in the first annular groove, a hole opener is fixedly connected to the right end surface of the annular plate, a first sliding frame is arranged on the left side of the fixed plate, an arcuate seat is fixedly connected to the top of the first sliding frame, a cylinder is installed in the arcuate seat, and an auxiliary mechanism is further arranged on the right end of the pushing beam; the positioning mechanism can constrain the drill rod during drilling, effectively limiting the radial swing of the drill rod during high-speed rotation.

The invention belongs to the technical field of drilling, and particularly relates to a drilling mechanical arm for underground engineering. Comprising a drill jumbo; a mechanical arm is mounted on the rock drilling trolley; a bracket is mounted on the mechanical arm; a propelling beam is mounted on the bracket in a sliding manner; a supporting plate slides on the sliding rail on the left side of the propelling beam, and a rock drill is mounted on the supporting plate; a drill rod is mounted on the rock drill; a fixed plate is fixedly mounted at the end part of the right side of the propelling beam; a first ring groove is formed in the through hole; an annular plate is rotationally arranged in the first annular groove; the right end face of the annular plate is fixedly connected with a tapper. A first sliding frame is arranged on the left side of the fixed plate; the top of the first sliding frame is fixedly connected with an arch-shaped seat; a cylinder body is mounted in the arch-shaped seat; an auxiliary mechanism is further arranged at the end of the right side of the propelling beam. By arranging the positioning mechanism, the drill rod for drilling can be restrained, and radial shaking of the drill rod during high-speed rotation is effectively limited.

The invention relates to the technical field of drilling equipment, and particularly discloses hole sealing and blasting trepanning equipment with a positioning mechanism, the hole sealing and blasting trepanning equipment comprises a fixed base, the top of the fixed base is fixedly connected with an angle adjusting device, and one side of the angle adjusting device is fixedly connected with a first connecting rod; a sliding base is fixedly connected to the end, away from the angle adjusting device, of the first connecting rod, a first sliding groove is formed in the side face of the sliding base, a first sliding block is slidably connected to the inner wall of the first sliding groove, a drill rod is fixedly connected to an impact shaft of the rock drill, and a tapper is fixedly connected to the end, away from the rock drill, of the drill rod. According to the hole sealing blasting tapping equipment with the positioning mechanism, the angle adjusting device is arranged, so that multi-angle arc positioning can be achieved, the supporting and fixing devices are arranged, so that a drill rod can be supported and fixed, and the drilling efficiency is improved. And the drilling precision is prevented from being influenced by violent shaking of the drill rod during drilling.

The invention provides a high-temperature alloy plate laser trepanning device, and relates to the technical field of laser trepanning. The two ends of the base are each provided with a set of positioning plates in a threaded mode, the rear end of the base is fixedly provided with a downward-pressing electric telescopic rod, the bottom of a transmission shaft of the downward-pressing electric telescopic rod is fixedly provided with a set of pressing frames, a suction fan is installed in a smoke suction frame, a rotating seat is rotationally installed on a laser tapper, and an inserting hole is formed in the top of a semi-grinding wheel. The inserting rod is inserted into an inserting hole in the top of the half grinding wheel; the device can accurately fix alloy plates of different sizes, and the adjusting adaptability is high; the semi-grinding wheel can be quickly disassembled, assembled and maintained, and the hole opening position can be ground to improve the efficiency; opening flue gas can be absorbed and purified in real time, and the environmental protection performance is enhanced; the problems that precise fixing of alloy plates of different sizes is difficult to achieve, and the function of the device is single are solved; the problems that after laser trepanning is conducted, the trepanning position is not prone to being rapidly polished, and smoke generated in the laser trepanning process cannot be effectively treated in time are solved.

1. Name of the designed product: soldering hole opener (series 1). 2. Use of the designed product: the designed product is used for drilling. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: perspective view.

1. The name of the design product: hole opener accessories. 2. The use of the design product: hole opener accessories for hole opening and drilling. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 3 in use state figure 4. 5. Design 3 is designated as the basic design.

The invention provides a quick-change tapper connecting rod, which relates to the technical field of tapping tools and comprises a rotating handle assembly and a tapping assembly which are detachably connected. The rotating handle assembly comprises a drill bit limiting sleeve and a clamping hoop assembly, the tapping assembly is composed of a cylindrical tapper and a positioning drill bit, the positioning drill bit penetrates through the interior of the cylindrical tapper, and one end of the positioning drill bit extends out of a bottom mounting hole and extends into the drill bit limiting sleeve to be detachably fixed through the clamping hoop assembly. A mounting table is arranged at the upper end of the drill bit limiting sleeve, a pressing assembly is arranged on the mounting table and comprises a locking piece, the locking piece can move horizontally, and a locking piece at the upper end of the locking piece can penetrate through a bottom mounting hole and press the edge of the hole; a lifting mechanism is arranged between the upper end of the drill bit limiting sleeve and the cylindrical tapper, and the locking piece and the hole edge can be quickly locked or separated by adjusting the vertical position of the cylindrical tapper. The connecting rod is matched with the lifting mechanism through the pressing assembly, the disassembly and assembly process is simplified, the tapper can be quickly replaced, the operation efficiency and convenience are improved, the structure is compact, and connection is stable.

The combined type hole taking device comprises a cutter handle, a connecting base is arranged at the tail end of the cutter handle and mainly composed of a connecting plate, a first boss and a second boss, the first boss is arranged at the bottom of the connecting plate, the second boss is arranged at the bottom of the first boss, threads are formed in the outer side of the first boss and the outer side of the second boss, and the first boss and the second boss are connected through threads. The outer side of the first boss is connected with a tapper, the bottom of the first boss is connected with a positioning drill, and a discharging set is arranged on the outer side of the positioning drill. The positioning drill is of an integrated structure; the integrated cutter handle and the positioning drill are detached, the cutter handle, the positioning drill and the hole tapper are connected through the connecting base, the damaged part can be replaced according to the use condition, so that the replacement cost is reduced, waste in the hole tapper is conveniently pushed out by a worker through the arrangement of the discharging set, and the practicability of the hole tapper is improved.

The utility model relates to the field of tappers, in particular to a tapper connecting rod. A tapper connecting rod comprises a base, an outer cutting knife connected to the base, a drilling assembly installed on the inner side of the base and a knife lock assembly located on the outer side of the base and used for locking the outer cutting knife, and a threaded hole used for being in threaded fit with the base and a positioning hole located in the side face of the threaded hole are formed in the outer cutting knife. The cutter lock assembly comprises a positioning piece arranged on the base in a sleeving mode and a cutter lock housing rotationally connected with the base, the positioning piece comprises a positioning column penetrating through the base to be inserted into the positioning hole, and the cutter lock housing is in threaded fit with the positioning piece. When the outer cutter needs to be replaced, the cutter lock housing is rotated, and the positioning piece in threaded fit with the cutter lock housing cannot rotate freely due to limitation of the positioning column and the positioning hole, so that the positioning piece moves downwards. And when the positioning column is separated from the positioning hole, the outer cutting knife can be screwed off and replaced by a new outer cutting knife.

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 invention relates to a fire extinguishing device using fire fighting water to drive a drill bit to drill a battery protection plate, the fire extinguishing device comprises a bottom frame (1), a lifting mechanism (2), a working platform (3), a power assembly (4) and a tapper (5), the power assembly (4) comprises a shell (41), an outer cylinder (42), an inner cylinder (43), a lifting shaft (44), a seat ring (45), a cover plate (46) and blades (47), the outer cylinder and the inner cylinder are coaxially arranged in the shell, and the lifting shaft (44) is arranged in the shell. Through holes allowing fire fighting water to pass through are formed in the walls of the outer cylinder and the inner cylinder, the hollow lifting shaft is arranged on the inner surface of the outer cylinder and the outer surface of the inner cylinder in a sleeving mode and can ascend and descend vertically, the outer surface of the upper end of the outer cylinder is sleeved with the seat ring, the cover plate covers the upper surface of the seat ring, and the blades are evenly arranged on the peripheral surface of the outer cylinder. The power assembly driven by fire fighting water is adopted for providing drilling power for the drill bit, extra power does not need to be provided during use, and therefore the fire fighting drill is wide in application range and high in stability.

The utility model belongs to the technical field of foundation tapping, and particularly relates to a fixed-length rotary excavating foundation tapper which comprises a quick connector, longitudinal beams, a square box body, cutting teeth, a hydraulic motor, a rotating shaft, a drill rod, drill teeth, a spiral blade and a sweeping plate, the quick connector is used for being connected with a small arm of an excavator, and the longitudinal beams are fixedly arranged at the four corners of the lower surface of the quick connector respectively. The square box is arranged among the four longitudinal beams, cutting teeth are arranged on the four edges of the bottom end of the square box, the hydraulic motor is installed in the quick connector, the top end of the rotating shaft is connected to an output shaft of the hydraulic motor, the drill rod is arranged at the bottom end of the rotating shaft, the drill teeth are arranged on the lower surface of the drill rod, and the spiral blade is installed outside the rotating shaft. A gap used for dumping soil is formed between the quick connector and the square box body, and the sweeping plate is arranged at the top end of the spiral blade and located in the gap. The device has the advantages of being simple in structure, convenient to disassemble and assemble, convenient and fast to construct and high in hole forming speed.

This utility model relates to the field of pipe drilling technology, specifically disclosing a portable pipe positioning and drilling device. It includes a fixed sliding bracket, with pipe clamping mechanisms fixed on both sides of the bottom end of the fixed sliding bracket. Each pipe clamping mechanism holds a pipe and includes a C-shaped retaining ring (first and second), connected by a wing bolt. The openings of the C-shaped retaining rings are opposite to each other, and their opposite sides are engaged with the outer surface of the pipe. A hole opener is slidably mounted through the middle of the fixed sliding bracket for drilling holes in the pipe. This utility model, by setting up a fixed sliding bracket and pipe clamping mechanisms, ensures that the sliding path of the hole opener will not deviate, avoiding slippage during the drilling process, thus improving stability. During the clamping and fixing process, the drilling position and angle can be checked to ensure drilling quality and improve drilling efficiency.

The application relates to the technical field of welding equipment and discloses a reamer welding equipment which comprises a first rack and a second rack located at one side of the first rack, a first feeding mechanism for transporting a drill bit body is arranged on the second rack, a clamping mechanism for clamping the drill bit body and rotating the drill bit body is arranged on the first rack, an adjusting mechanism for adjusting the position of the clamping mechanism is arranged on the first rack, a first conveying mechanism for mounting the drill bit body to be machined on the clamping mechanism and taking the machined reamer from the clamping mechanism is arranged on the first rack, a second feeding mechanism for conveying a cutting edge is arranged on the first rack, a second conveying mechanism for mounting the cutting edge on the drill bit body is arranged on the first rack, and a welding mechanism for welding the drill bit body and the cutting edge is arranged on the first rack. The application has the effect of improving the production qualified rate of the reamer.

1. The name of the design product: hole opener. 2. The use of the design product: for marble, granite and other stone hole drilling operations. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The utility model relates to the technical field of petroleum and natural gas pipeline maintenance and first-aid repair operation tools, in particular to a perforated arc plate concentric marking tool which comprises a perforated arc plate, an expansion base, a linear shaft, a sliding block, a scale rod, a marking rod and a slate pencil clamp, the perforated arc plate is arranged on the outer side of the expansion base, and the expansion base is located on the inner side of a center hole of the perforated arc plate. A linear shaft is arranged above the expansion base and perpendicularly fixed to the expansion base, the axis of the linear shaft coincides with the axis of a center hole of the perforated arc plate, the linear shaft is sleeved with the sliding block, the sliding block can slide in the axial direction of the linear shaft and rotate around the linear shaft, a scale rod is arranged on the inner side of the sliding block, and the two ends of the scale rod extend to the outer side of the sliding block. A scribing rod is arranged on one side of the scale rod; according to the utility model, the concentric circle of the overlook projection can be drawn on the curved surface of the arc plate by centering through the tapping of the center drill of the tapper, and the scribing requirements of connecting pipes with different diameters can be met by adjusting the radius of the circle.

The invention relates to the technical field of heat preservation plate machining, in particular to a tapper device for a cast-in-place concrete sandwich heat preservation system, and solves the problems that when an existing sandwich heat preservation plate is tapped, the surface of the sandwich heat preservation plate is prone to deformation due to impact by adopting a single-side tapping mode, burrs are prone to being generated on the hole edge after tapping, and the machining efficiency is high. The device comprises a trepanning mechanism and a drilling transmission mechanism, the drilling transmission mechanism is installed on the inner side of the trepanning mechanism, the trepanning mechanism comprises a transmission sleeve, an annular drilling device is installed at the front end of the transmission sleeve, and a plurality of welding spot filling pieces are installed between the transmission sleeve and the annular drilling device; and a plurality of alloy blades are fixedly mounted on the outer side of the front end of the annular drilling device. According to the invention, the two sides of the sandwich insulation board are holed, so that the high-quality holing operation of the sandwich insulation board in a mounting state can be met, and the surface of the sandwich insulation board is effectively prevented from being impacted to deform and generate burrs.

1. Name of the product in this design: Hole opener. 2. Purpose of this design: A hole opener for drilling and opening holes. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

A hole saw having an internal saw with a circular sidewall including a working end including teeth and a backwall connected to the sidewall. The backwall includes an aperture concentrically located with respect to the circular sidewall for receiving a pilot drill designed to extend beyond the working end of the circular sidewall. The hole saw also has an external saw with a circular sidewall with a greater diameter than the circular sidewall of the internal saw. The circular sidewall of the external saw has teeth and an oppositely located proximal end that includes tangs separated by notches. A base plate is fastened to the circular sidewall of the external saw. The base plate includes a plurality of apertures for fixing the base plate to the backwall of the internal saw and locating the circular sidewalls concentric with respect to each other.