2995 results about "Wrench" patented technology

The invention provides an accurate leveling mobile culture bed solving the problems that the traditional mobile culture bed is inconvenient to adjust in height and cannot ensure that the bed surface is absolutely level. The height adjustment and the level adjustment of the accurate leveling mobile culture bed are implemented through the height adjustment and the level adjustment of a rolling shaft support, and the height adjustment and the level adjustment of the rolling shaft support are implemented through rotating a hold-down nut on a screw rod by using a spanner to adjust the relative distance between the rolling shaft support and a gantry support and the self level of the rolling shaft support. Because the rolling shaft support and the gantry support are connected by a leveling screw and fixed by the nut, and the spacing adjustment and the level adjustment between the rolling shaft support and the gantry support are completed by the relative movement between the leveling screw and the hold-down nut, the continuous smooth adjustment between the rolling shaft support and the gantry support can be implemented to achieve the absolute level of the culture bed surface.

The invention discloses a lightning arrester installation tool, and belongs to the technical field of distribution network operation and maintenance. The tool comprises a connecting clamping jaw, a limiting plate, a distance adjusting module, a clamping clamping jaw, a drainage wire clamp module and a base hook, wherein the connecting clamping jaw can be used for pre-assembling the lightning arrester on the ground, and an impact wrench is used for automatically tightening the lightning arrester; the limiting plate is accurately positioned through the guide long plate; the distance adjusting module adjusts height through an electric push rod and a guide rail; the clamping jaw is driven by the steering engine to clamp the lightning arrester; the base hook hangs the wire by means of force, and the roller assists in stabilizing. The installation method comprises ground pre-assembly and high-altitude installation, the insulator does not need to be dismantled, the on-pole operation time is shortened by 50%, and the efficiency is doubled. Power failure can be avoided, operation and maintenance intensity is reduced, power supply reliability is improved, and the method is suitable for distribution network non-power-failure operation.

The invention discloses an adjustable automatic feeder base, and relates to the technical field of feeder bases. Comprising a supporting base part, an adjusting piece is installed on the supporting base part, and the adjusting piece is used for being installed at the bottom of an automatic feeder frame through bolts; a detection adapter is mounted on the adjusting piece; a belt attaching part is mounted on the detection adapter; the belt laminating piece is used for laminating a belt of the automatic feeder; the belt attaching wheel can be attached to a belt to roll, an extrusion delay switch is automatically controlled, real-time detection can be achieved when the automatic feeder is kept in the running state, and a positioning electromagnet is controlled to magnetically attract and attach to the bottom of a wrench butt joint plate to conduct limiting work. The adjustable automatic feeder base solves the problem that an existing adjustable automatic feeder base is inconvenient to automatically limit shutdown operation and adjustment.

The utility model discloses a quick connecting and clamping device which comprises a core rod, a pulling and screwing assembly arranged on the core rod and an elastic assembly connected to the core rod in a sleeved mode, and the pulling and screwing assembly comprises a cam handle rotationally connected to one end of the core rod and a spring piece movably arranged at the other end of the core rod. The cam handle is connected with the end of the spring piece, a first flat position is arranged at the end, close to the spring piece, of the core rod, an installation groove is formed between the first flat position and the core rod, a locking block is arranged on the core rod, a first kidney-shaped hole is formed in the locking block, and a second kidney-shaped hole is formed in the first kidney-shaped hole. The locking block penetrates through the first flat position through the first kidney-shaped hole and is connected into the mounting groove, and when the locking block rotates till the length direction of the first kidney-shaped hole is inconsistent with the length direction of the first flat position, the first flat position limits movement of the locking block. The quick connecting and clamping device has the advantages of being high in vibration resistance and impact resistance, reliable in connection, capable of being quickly disassembled and assembled, capable of being repeatedly disassembled and assembled for use, convenient to disassemble and assemble, easy to machine and manufacture and the like.

The invention discloses intelligent bolt fastening equipment which comprises a fixing mechanism, a translation mechanism, a shifting mechanism, a wrench floating mechanism, a wrench assembly, a sleeve measuring device and an optical switch assembly. Wherein the fixing mechanism is used for fixing the whole bolt fastening equipment on a device to be fastened; the translation mechanism is fixed on the fixing mechanism, the turning mechanism is fixed on the translation mechanism, the wrench floating mechanism and the sleeve measuring device are fixed on the turning mechanism, the wrench assembly penetrates through the wrench floating mechanism and the turning mechanism, and the sleeve measuring device measures whether a bolt sleeve at the tail end of the wrench assembly is matched with a to-be-fastened bolt or not; the translation mechanism drives the turning mechanism, the wrench floating mechanism, the wrench assembly and the sleeve measuring device to move up and down, and the optical switch assembly triggers and measures the displacement of the up-and-down movement. The bolt fastening device is wide in application range, high in bolt fastening precision and accuracy and long in service life.

The utility model discloses a hoisting mounting rack for an angle iron clamping device. The hoisting mounting rack comprises a hoisting bottom plate, a spring pressing plate assembly, a locking hook assembly, an electric wrench assembly and a hoisting ring, the hoisting bottom plate is a pi-shaped thick plate and is provided with an opening, and the upper surface of the hoisting bottom plate is used for fixedly arranging the spring pressing plate assembly; the two locking hook assemblies are symmetrically located on the two sides of the spring pressing plate assembly. And the electric wrench assembly. And the four lifting rings are respectively arranged at four corners of the lifting bottom plate. The quick-mounting clamping device is clamped by the quick-mounting clamping device, the quick-mounting clamping device is lifted to angle iron of an iron tower where the quick-mounting clamping device needs to be mounted through lifting equipment, then quick mounting is achieved, climbing operation of personnel is not needed in the whole process, mounting is convenient and fast, and safety is high.

The invention discloses an anti-loose structure nut and a using method thereof, and the anti-loose structure nut is composed of an upper nut and a lower nut; one end of the upper nut is of a conical surface structure, and the inclined angle of the conical surface structure relative to the central axis of the upper nut is 16 degrees; a groove is formed in the conical surface structure; the upper portion of the lower nut is an inner taper hole, the lower portion of the lower nut is a straight hole, and the included angle between inclined generatrixes on the two sides of the inner wall of the inner taper hole is 16 degrees. The diameter of the inner taper hole is smaller than that of the conical surface structure. The using method comprises the following steps that (1) the lower nut is screwed into the bolt penetrating into the interlayer; and (2) screwing the upper nut into the inner taper hole of the lower nut by adopting a hexagonal wrench. The device is simple in structure and easy to process and manufacture; common carbon steel or stainless steel materials are adopted, so that the manufacturing cost is low; the locking torque is large and stable, and the anti-loosening performance is excellent; during installation, the locking torque can be adjusted according to actual requirements; and the locking torque is stable and reliable, and can be repeatedly disassembled and used.

The utility model relates to the technical field of outdoor articles, and discloses an alpenstock telescopic rod lock catch structure which is characterized in that a lock sleeve is movably connected with a locking buckle, one end of the locking buckle is movably connected with a fastening wrench, the fastening wrench is movably connected with the lock sleeve, the locking buckle comprises a first end part and a second end part, the first end part is provided with a connecting hole, and the second end part is provided with a connecting hole; one end of the lock sleeve is movably connected with the connecting hole, a connecting groove is formed in the locking buckle, one end of the fastening wrench is arranged in the connecting groove and movably connected with one end of the lock sleeve, and when the fastening wrench rotates to abut against the lock sleeve, the second end portion clamps and tightens one end of the lock sleeve so that the inner diameter of the lock sleeve can be decreased. According to the alpenstock telescopic rod lock catch structure, locking and unlocking of the lock sleeve are adjusted through rotation of the locking buckle and the fastening spanner, and a user can operate the alpenstock telescopic rod lock catch structure more conveniently.

This utility model discloses an automatic circuit board testing device, including a base and a support. The support has a crossbeam and a vertical support. The crossbeam is equipped with a vertical moving mechanism that drives a detection positioning plate to move up and down. The vertical support has a guide mechanism that slides with the detection positioning plate. The detection positioning plate has several circular holes for placing detection probes or detection seats. The circular holes are arranged in a matrix and have annular grooves inside. The annular bosses on the detection probes or detection seats are interference-fitted with the annular grooves for fixation. The vertical moving mechanism can adopt a wrench drive or a bushing structure. The guide mechanism includes a guide post that fits with a through hole or a groove that fits with a boss. The device also includes a transition plate and a transition hole on the base. This device achieves automated testing through mechanical structure design, improving efficiency and accuracy, and has the advantages of strong versatility and convenient maintenance.

In a combine harvester, a hinged door provides access to an aperture in a wall of a walled compartment. A camera may be attached to the door, for monitoring the interior of the compartment. The door is configured to be locked and unlocked by an overcenter mechanism and requires an auxiliary tool for locking and unlocking the mechanism. The mechanism includes a pivotable rod pivotable about a first pivot axis relative to the door, and an overcenter arm that is pivotable at one end relative to a lever fixed to or integral with the rod. The other end of the overcenter arm is attachable to the wall including the aperture covered by the door. The overall dimensions of the mechanism are such that pivoting the rod to thereby lock or unlock the mechanism requires an auxiliary tool. A wrench or similar gripping tool may be used for pivoting the rod.

The active clamping type fastener anti-disengaging electric wrench comprises an electric tool body and a wrench sleeve, an output shaft is arranged at one end of the electric tool body, the wrench sleeve is assembled on the output shaft, and the wrench sleeve comprises an outer cylinder body and a driving block arranged in the outer cylinder body in a sliding mode in the axial direction; a movable section allowing the driving block to move front and back and a limiting section for axially limiting the driving block are arranged in the outer barrel, a clamping assembly is embedded in the inner wall of the movable section, and when the driving block is pushed by an external fastener to move to the limiting section, the clamping assembly is pushed outwards to clamp the fastener. According to the active clamping type fastener anti-disengaging electric wrench, the technical problems that an existing electric wrench enables a fastener to slip easily, and the fastener can fall out of a sleeve due to the fact that the fastener cannot be actively clamped are solved.

A lightweight fastener assembly with reduced weight and method is provided. The fastener assembly has a fastener body with a cap retention feature adjacent a first end and a threaded portion extending from a second end. A load bearing surface is configured to mate with a fastener seat on a wheel. A flange is formed adjacent a load bearing surface and having a diameter larger than the cap retention feature. A wrenching feature is formed between the cap retention feature and the second end and is configured to be engaged by a standard tool. A cap is secured to the cap retention feature on the fastener body and has upright contoured walls extending to a cap top. The cap is hollow in a capped region defined by the contoured walls and cap top beyond the first end of the fastener body.

The invention provides a power connector with a power-assisted unlocking mechanism, and relates to the technical field of power connectors. When a wire end connector and a seat end connector are connected in an inserted manner, a wire end connecting lock catch and a seat end connecting lock catch can be automatically clamped and locked, so that the wire end connector and the seat end connector are locked and limited; the locking process is convenient and labor-saving, and plugging and locking of the power supply connector in a narrow space of a vehicle are facilitated. When the wire end connector needs to be pulled out, the wrench is upwards pushed and rotated through fingers, the wrench can upwards push and lift the clamping end of the wire end connecting lock catch during rotation so as to release locking between the wire end connecting lock catch and the seat end connecting lock catch, then the wrench is pulled through the fingers, pulling force can be provided for the wire end connector through the wrench, and the wire end connector can be pulled out through the seat end connecting lock catch. The wire end connector is separated from the seat end connector, so that unlocking of the power connector and pulling out of the wire end connector are more convenient and labor-saving, and unlocking and pulling out of the power connector in a narrow space of a vehicle are facilitated.

The present disclosure relates to a chassis with a chassis lock, and an opening / closing method. The chassis is internally provided with a compartment sliding rail and a pull-out compartment, the pull-out compartment is slidably mounted on the compartment sliding rail, the chassis lock is provided between the compartment sliding rail and the pull-out compartment, a sliding rail through hole is provided in the compartment sliding rail; the chassis lock comprises a power-assisted wrench, the power-assisted wrench is hinged to the interior of the sliding rail through hole, a locking slider is slidably mounted on the power-assisted wrench, a locking hook is provided on the power-assisted wrench, a locking slot is formed between the locking hook and the locking slider; a compartment protrusion is provided at the bottom of the pull-out compartment, and the compartment protrusion enters or is detached from the locking slot.

Impact wrench (1) having an overall shape of a ‘T’ and comprising an upper handle group (2), a lower working group (3) and an intermediate connecting rod (4) connected between the handle group (2) and the working group (3), wherein: - the handle group (2) comprises a first body (2') with two elongated handles (5, 6) extending in opposite directions to each other and transversely to a longitudinal direction (14) of the screwdriver (1), a manual actuating element (7) and a battery seat (8) for receiving an electric battery (9), - the working group (3) comprises a second body (3'), a tool holder shaft (10) rotatably mounted about a pivot axis (R) and capable of carrying a screw bushing, an electric motor (11) powered by the battery (9) and operable by the manual actuating element (7), a gearbox (12) and an impact mechanism (13) connected between the motor (11) and the tool holder shaft (10) to impart rotational and impact impulses, where: - the battery seat (8) consists of a cavity (34) formed in an outer surface of the first body (2') on an operator side (33) of the impact wrench (1), wherein the cavity (34) is open to the outside of the first body (2') on the operator side (33) and on a top surface (35) of the impact wrench (1) opposite the working group (3), - the cavity (34) accommodates the battery (9) over at least half of its thickness (37), measured in the direction of the operator side (33), and / or the battery (9) extends beyond the free ends of the handles (5, 6) in the direction of the operator side (33) by less than one third or less than one quarter of the thickness of the battery (37), measured in the direction of the operator side (33).

A wrench angle adjusting structure comprises a wrench handle body, a working head and a clamping unit, a first convex lug and a second convex lug which are symmetrical are arranged at one end of the wrench handle body, a pivoting space is formed between the first convex lug and the second convex lug, and the first convex lug and the second convex lug are provided with a shaft hole and a braking hole which are parallel to each other; the working head is bolted in the pivoting space in a swinging manner by matching a pivoting lug with a shaft bolt, and an arc-shaped clamping part is arranged at the end edge of the pivoting lug; the clamping unit is contained in the braking hole and provided with an elastic piece and a switching control column, the outer diameter face of the switching control column is provided with an idling section and a clamping section in a concave mode, the idling section and the clamping section are arranged on the outer diameter face of the switching control column, a limiting wall is further formed close to the clamping section, and angle adjustment and positioning of the working head are further controlled by pressing or not pressing of the switching control column.

The utility model relates to the technical field of hardware tools, in particular to a double-opening wrench with a lubricating function, which comprises a double-opening wrench body, a reserved opening is arranged on the surface of the double-opening wrench body, mounting grooves are arranged at two ends of the reserved opening, and oil absorption cotton blocks are inserted into the mounting grooves. Oil seepage grooves are formed in openings in the two ends of the double-opening wrench body, oil seepage holes are formed in the surfaces of the oil seepage grooves, and the oil seepage holes communicate with the mounting groove; the lubricating oil supply device has the beneficial effects that by pushing the push rod, the piston plate extrudes the oil absorption cotton block, absorbed lubricating oil seeps into the oil seepage groove through the oil seepage hole, and automatic supply of the lubricating oil is achieved. In this way, operation is easy and convenient, it can be guaranteed that the wrench is always kept in a good lubricating state in the using process, and therefore the working efficiency is improved.

As shown in the reference figures 1 and 2 illustrating the usage state, this product is a box-end wrench that can be fitted onto the bolts of an auto tensioner without interfering with, for example, the crank pulley or belts attached to each pulley (water pump belt, generator belt) of an automobile engine, making it easy to attach and detach the bolts. In other words, this box-end wrench makes it possible to fit bolts in confined spaces during automobile maintenance, etc., without interfering with other parts.

The invention discloses an oil level gauge guide pipe and forming equipment thereof, relates to the technical field of engine lubricating systems, and aims to solve the technical problem that sealing performance and mounting convenience of a traditional oil level gauge guide pipe are difficult to consider at the same time, and the oil level gauge guide pipe comprises an oil level gauge guide pipe body, a mounting pipe and a sealing ring. The contact area with an oil pan opening is increased by arranging the sealing ring, so that the sealing performance is improved, through the structural design of the mounting pipe, the nut is rotated through a wrench, so that the nut moves relative to the threaded groove, the mounting pipe is pushed to be inserted into the sealing ring, axial support is provided for the sealing ring through the supporting rod, and the sealing ring is prevented from being axially folded; when the installation pipe is completely inserted into the sealing ring, the sealing ring is expanded and is in close contact with the oil pan opening, compared with a traditional direct hard insertion mode, the installation mode is more time-saving and labor-saving, and the technical problem that a traditional oil level gauge guide pipe is difficult to consider sealing performance and installation convenience at the same time is solved.

The invention relates to the technical field of high-voltage switch cabinets, and particularly discloses a high-voltage switch cabinet wiring device which comprises a high-voltage cabinet body. The fast-assembly element is located on the inner wall of the high-voltage cabinet body, the fast-assembly element comprises a switch assembly, the switch assembly is provided with a wiring interface used for being connected with a three-phase power line, and a fast-assembly mechanism is arranged on one side of the switch assembly; the high-voltage cabinet comprises a high-voltage cabinet body and an anti-falling element, the anti-falling element is arranged in the high-voltage cabinet body and comprises a bottom plate, and a supporting piece for limiting a circuit is arranged at the top end of the bottom plate, so that a traditional screw fastening mode is abandoned, various tools such as a wrench and a screwdriver do not need to be carried, the wiring operation process is simplified, and the wiring efficiency is improved. According to the utility model, tedious steps caused by tool operation are reduced, the wiring operation is simpler, more convenient and quicker, and through the synergistic effect of the quick assembly mechanism and the anti-falling element, after the wiring interface is connected to the line, the line can be stably clamped and limited in multiple directions.

1. Name of the designed product: seat wrench (AF7). 2. Use of the designed product: used for adjusting the chassis of a seat. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: perspective view.

The utility model discloses a clamping jaw type phase-to-phase spacer assembly, and relates to the technical field of electric power protection, the clamping jaw type phase-to-phase spacer assembly comprises a spacer body and a control steering engine, the left end and the right end of the spacer body are fixedly connected with fixing pieces respectively, the outer sides of the two fixing pieces are fixedly connected with connecting frames respectively, and the outer sides of the two connecting frames are connected with fixing frames respectively. Electric wrenches are connected to the fixing frames respectively, hanging rings are connected to the upper ends of the fixing parts respectively, baffles are fixed to the front ends and the rear ends of the fixing parts respectively, connecting plates are fixedly connected to the interiors of the fixing parts respectively, racks are slidably connected to the lower ends of the connecting plates, the lower ends of the racks are in transmission connection with two clamping jaws distributed left and right, and the clamping jaws are rotationally connected with the fixing parts. The right end of the rack is connected with a screw rod, the screw rod is in transmission connection with the electric wrench, the effect of one-way movement of the rack is achieved through clamping connection of the abutting plate and the teeth, reverse rotation of the screw rod is prevented after the electric wrench is disengaged, and clamping and fixing of a cable are guaranteed.

The utility model relates to the related technical field of spring processing, in particular to a screening device for taper springs, which comprises a vibrating disc and an adjusting mechanism, a circulating mechanism is arranged on one side of the surface of the vibrating disc, and an adjusting mechanism is arranged on one side of the surface of a feeding plate. According to the screening device for the taper springs, through the arrangement of an adjusting mechanism, a limiting block is pressed to be completely embedded in a movable groove, at the moment, the limiting block loses the limiting effect on an adjusting plate, a wrench is pulled to enable the adjusting plate to slide in an adjusting groove, and therefore the size of a screening groove can be adjusted when the adjusting plate moves; one end of an adjusting plate is moved to a proper position in the screening groove according to needs, meanwhile, a movable groove is aligned with a set of limiting holes in position, at the moment, a reset spring rebounds and deforms to drive a limiting piece and a limiting block to restore to the original position, one end of the limiting block is embedded into the limiting holes, the adjusting plate is fixed through the limiting block, and the screening effect is improved. Therefore, the size of the screening groove can be adjusted.

1. The name of the design product: pneumatic and manual dual-purpose sleeve. 2. The use of the design product: used for matching with wrench to screw the sleeve including nut, nut, screw, eccentric wheel, bolt, screw. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 1 perspective view 1. 5. Design 1 is designated as the basic design.

The invention discloses a multifunctional wrench for railway maintenance, and relates to the field of railway maintenance equipment, the multifunctional wrench comprises a wrench body, the wrench body is provided with a fixed jaw, a movable jaw, a worm, a rotating shaft and a handle, the wrench body is provided with a torque measuring assembly, and the torque measuring assembly comprises a strain gauge arranged on the fixed jaw and a display screen arranged on the handle and provided with a controller. A laser warning assembly is arranged on the handle, rotating shafts are arranged on the two sides of the worm and rotationally connected with the handle, a driving assembly for driving the rotating shafts to rotate is arranged in the handle, and a battery is embedded in the handle. When a user uses a wrench to tighten or loosen a nut, the movable jaw moves through thread engagement of the worm so as to clamp a workpiece; a strain gauge in the torque measuring assembly is installed on the fixed jaw and can sense applied force and generate an electric signal, the signal is transmitted to the display screen controller on the handle, the torque value is displayed in real time, and the laser warning assembly can emit laser in the working process to conduct detection so as to provide safety warning. And the accuracy and safety of maintenance are improved.

The utility model provides an angle grinder press plate and an angle grinder wrench, which comprise a circular press plate body, the center of the press plate body is provided with an internal threaded hole, and the upper side surface of the press plate body is uniformly provided with a plurality of polygonal counter bores to form a multi-surface contact structure of the press plate and the wrench so as to effectively prevent slipping during assembly and disassembly. The distances between the polygonal counter bores and the center of the nut body are equal. The polygonal counter bore is formed in the angle grinder pressing plate and is matched with the angle grinder wrench with the polygonal stud, so that a multi-surface contact structure of the polygonal counter bore and the polygonal stud is formed.

The utility model discloses an end face beveled V-shaped material fixing device convenient to adjust, and relates to the technical field of beveled positioning tools.The end face beveled V-shaped material fixing device convenient to adjust comprises a machining table, a workpiece bearing table is arranged on one side of the machining table, and an electric guide rail is installed on the other side of the machining table; the upper end of the electric guide rail is in transmission connection with a cutting mechanism, a first fixing mechanism and a second fixing mechanism are arranged on the workpiece bearing table, the first fixing mechanism and the second fixing mechanism are oppositely arranged, and suction cup mounting grooves are formed in the two ends of the first fixing mechanism and the two ends of the second fixing mechanism correspondingly. According to the scheme, the problem that in the using process of an existing device, the angle of the positioning block is fixed, and follow-up adjustment is tedious is solved.

The utility model relates to a wrench tool technical field discloses a kind of quick fixed nut wrenchs convenient to use in narrow space, including handle, the inside sliding connection of handle has driving mechanism, the inside recess of handle is equipped, the top of handle is fixedly connected with rotating mechanism, the front side fixedly connected with connecting block of rotating mechanism, the front side fixedly connected with adjusting mechanism of connecting block, the front side fixedly connected with square head of adjusting mechanism, the driving mechanism includes protective sleeve, the inside sliding connection of protective sleeve has support plate, the top of support plate is fixedly connected with spring one. In the utility model, the length of handle can be adjusted according to the depth of narrow space, the effect of easily stretching into narrow area is realized, the head of wrench and handle can be freely rotated within a certain angle range, and the effect that wrench can easily cope with various complex angles in narrow space is realized.

The utility model discloses a turn buckle rapid tensioning structure which comprises a pulling plate, an adjusting hole is formed in the middle of the pulling plate, a sleeve is arranged at each of the two ends of the pulling plate, the turn buckle rapid tensioning structure further comprises an adjusting screw rod, the adjusting screw rod penetrates through the sleeves and extends into the adjusting hole, and an adjusting nut is installed at the end, extending into the adjusting hole, of the adjusting screw rod. The sleeve structure is adopted, the adjusting nut is installed at the end, penetrating through the sleeve and extending into the adjusting hole, of the adjusting screw rod, and the adjusting screw rod is in non-threaded connection with the sleeve. The electric wrench socket head which is well adaptive to an electric tool is adopted to rotate the adjusting nut so as to adjust the tensioning force, manpower consumption is greatly reduced, and the construction efficiency is improved.

The present application provides a manufacturing method of a wrench, which is suitable for deburring a workpiece with a wrench rough shape, the workpiece comprising an upper end surface, a lower end surface opposite to the upper end surface, and a punching hole extending from the upper end surface to the lower end surface, the punching hole and the upper end surface or the lower end surface have burrs, and the manufacturing method comprises: fixing the workpiece by a holding tool; and removing the burrs by a flat grinding surface of a grinding element. Thus, the burrs can be quickly removed without element alignment.