26results about How to "Avoid miscutting" patented technology

The utility model relates to the technical field of fruit tree pruning, in particular to a portable electric fruit tree pruning device. The utility model provides a portable fruit tree electric pruning device which can directly spray a medicament on the wound of a branch in the pruning process, and is more convenient and labor-saving. A portable fruit tree electric pruning device comprises a telescopic rod, electric scissors, a switch and a pesticide spraying assembly, the upper portion of the telescopic rod is rotationally connected with the electric scissors, the switch is arranged on the lower portion of the telescopic rod and electrically connected with the electric scissors, and the pesticide spraying assembly is connected to the telescopic rod. In the pruning process, the pesticide in the pesticide box is conveyed to the spray head through the liquid conveying pipe, and then the pesticide is sprayed to the cut of the pruned branch through the spray head, so that the pesticide is sprayed to the cut of the branch, the pesticide can be directly sprayed to the cut of the branch in the pruning process, and the effects of being convenient and labor-saving are achieved.

The embodiment of the invention provides a connector terminal plug-in mounting device, and relates to the technical field of automatic assembly equipment, the connector terminal plug-in mounting device comprises a rack and a working track arranged on the rack, a feeding mechanism, two plug-in mounting mechanisms and a discharging mechanism are sequentially arranged along the processing direction of the working track, and a carrying mechanism is arranged at the working track. The plug-in mounting mechanism comprises a terminal feeding assembly, a plug-in mounting assembly and a material folding assembly, the plug-in mounting assembly comprises a first sliding block and a second sliding block which move in the two perpendicular directions, the first sliding block is provided with a plug-in mounting head, the second sliding block is connected with a clamping plate used for clamping a terminal material belt, and the plug-in mounting mechanism further comprises a shearing assembly. The shearing assembly is of a cutter structure driven by a lever, and a cutter automatically resets by means of shearing reaction force after shearing is completed. The device has the effects of preventing the terminal material belt from being cut by mistake and effectively separating the terminal from the material belt.

The invention relates to a monitoring system of a low-frequency load shedding device, which is applied to the field of power supply or power distribution, and comprises a device body, an execution mechanism arranged in the device body, a DSP (Digital Signal Processor) operation processing unit carried in the device body and double sets of redundant links connected with the device body, by adopting the arrangement of double sets of redundant link data acquisition units, a scheduling regulation feedback unit, a reserved re-verification unit, a prediction scheduling emergency unit and a load regulation emergency recovery unit, the fusion of multi-source information can be promoted in the application process of the monitoring system, on one hand, the intermittency and volatility of new energy are predicted and applied, and on the other hand, the integration of the multi-source information is facilitated; on the other hand, data can be re-verified after load regulation and control, data errors caused by previous-stage actions are reduced, false actions of the device body are reduced, effectiveness and safety of load cutting of the device body are guaranteed, and monitoring accuracy and stability of the monitoring system on power grid frequency data are effectively improved; and the phenomenon of mistaken cutting or missing cutting is avoided.

The utility model provides a film sealing mechanism, which is used for packaging a packaging film of a silicon wafer, and is characterized in that the film sealing mechanism is at least provided with a film cutting part, and the film cutting part comprises a film cutting frame, a cutter frame, a molybdenum plate frame and a monitoring assembly for monitoring the position of the silicon wafer; the cutter frame and the molybdenum plate frame are both movably connected with the film cutting frame; the monitoring assembly is arranged on the film cutting frame and located on the outer side of the cutter and can monitor the thickness and the width of the silicon wafer. According to the film sealing mechanism, an existing film sealing structure is optimized, the condition of silicon wafer transmission displacement can be automatically monitored, meanwhile, the fool-proof assembly is arranged, and the silicon wafer is prevented from being cut by mistake; meanwhile, a plastic film supporting structure is improved, and dislocation or dislocation is prevented; the whole film sealing mechanism is simple in structure, easy to control, good in film sealing effect, stable in quality and high in film sealing efficiency. The utility model further provides packaging equipment provided with the film sealing mechanism.

The application discloses a kind of laser clearing robot construction method and device based on AI vision dynamic aiming, belong to electric power clearing equipment technical field.The device contains mobile carrier, AI vision aiming, laser cutting, automatic control and power supply five big components: mobile carrier adopts caterpillar type structure, can adapt complex terrain;AI vision aiming component can accurately identify the branch invading 1 meter safety area of feeder and calculate cutting point;Laser cutting component can complete accurate cutting of branch;Automatic control component automatically formulates cutting scheme and from high to low cutting order, autonomously controls robot movement, aiming and cutting, avoids branch frame insertion, pressure broken feeder;Power supply component provides stable power for field operation.Its construction method covers component assembly, system commissioning, optimization debugging and operation maintenance.The application realizes clearing operation fully automatic, precision, safety, solves the problem of low efficiency, poor safety, easy to damage feeder of traditional clearing, can effectively guarantee the safe operation of transmission line.

The utility model provides a material cutting machine for shoe production, and belongs to the technical field of shoemaking equipment. Comprising a cutting platform, a first mounting frame is horizontally and slidably mounted on the cutting platform, a first moving seat is slidably mounted on the first mounting frame, a rotating frame is rotatably arranged at the bottom end of the first moving seat, a second moving seat is slidably arranged on the rotating frame, and a vibration tool bit is arranged at the bottom of the second moving seat; and a pressing fixing piece is arranged on the first moving seat and located on the outer side of the rotating frame. In the process that the rotating frame rotates and the second moving seat linearly moves on the rotating frame, the vibrating tool bit cuts the cloth according to the needed pattern on the cloth, in the cutting process, the downward pressing fixing pieces on the two sides of the rotating frame tightly press the cut insole on the side of the rotating frame, the situation that the cut insole tilts and is cut by mistake is avoided, and the cutting efficiency is improved. The shoe pad cutting device improves the effect of cutting shoe pads on cloth.

The utility model discloses a hair trimmer which comprises a first shell and a second shell which are rotationally connected, a cutting notch is formed in the first shell, a cutting base is rotationally connected in the cutting notch, an equipment cavity is formed in the cutting base, a receding groove communicated with the equipment cavity is formed in the surface of the cutting base, a hair cutting assembly is arranged in the equipment cavity, and the first shell and the second shell are rotationally connected. The hair cutting assembly partially extends out of the equipment cavity through the receding groove, a plurality of comb teeth are fixed to the cutting base, and a driving device used for driving the cutting base and the hair cutting assembly to operate is arranged in the cutting base. When the product is used, hair is combed and scattered through the comb teeth, a hair main body is kept straight under the press fit of the first shell and the second shell, split hair tips are scattered and then tilt from the hair main body, the turnup hair tips are cut by the hair cutting assembly, the product can ensure that cutting is only carried out on the hair tips, the operation mode is very simple and convenient, and the working efficiency is greatly improved. Meanwhile, the long hair rod can be prevented from being cut by mistake, and it is guaranteed that the cut hair has a good impression.

The invention relates to a novel towel embroidery thread trimming control method which is applied to an embroidery machine comprising a towel needle bar, a machine needle and a D shaft, the machine needle is fixedly installed on the towel needle bar, the head of the machine needle is opened inwards to form a stroke hook shape to allow an embroidery thread to penetrate in and break away to form a stitch, and the D shaft is used for controlling directional rotation of the towel needle bar; the method comprises the following steps: step 1, controlling the rotation direction and the rotation angle of a D axis; 2, when the main shaft runs to 180 degrees, the D shaft is started to rotate, the vector value theta of the rotation angle is equal to the sum of the pattern stitch tangent angle Y and 180 degrees, and 230-degree rotation of the main shaft is completed; 3, the towel machine needle is driven by the main shaft to continue to move upwards to the parking space. 4, the shaft D runs to the original point, a machine needle high motor runs to the highest separation position, and thread trimming is completed. The problems of towel embroidery thick material laddering, unclean thread separation and the like during actual embroidery can be solved, the quality of embroidery products can be greatly improved, and the repair rate of workers to the embroidery products is reduced.

The utility model provides a film trimming device, which relates to the field of film trimming and comprises a cutting rail, a cutting guide block and a protective cover, the cutting guide block is arranged on the periphery of the cutting rail, an adjusting seat is arranged at the bottom of the cutting guide block, a motor is arranged on one side of the adjusting seat, electric guide rails are arranged on two sides of the inside of the protective cover, and the electric guide rails are arranged in the protective cover. According to the thin film edge cutting device, a worker adjusts the blade to descend and extend out of the protective cover, thin film edge cutting work can be completed by transversely sliding the cutting guide block on the cutting rail, edge cutting of a single thin film is completed, and when it is detected that no thin film exists below through the photoelectric sensor, edge cutting of the single thin film is completed. And the electric guide rail drives the sliding block and the blade to ascend, and the blade is stored in the protective cover, so that the situation that cutting is conducted by mistake or workers are injured by mistake can be avoided, and the practicability of the device is improved.

The utility model discloses a multi -joint machine tool suitable for high altitude pruning and fruit picking belongs to operation machine tool technical field, multi -joint machine tool includes swing joint, swing joint includes first swing joint, second swing joint and third swing joint that set gradually, first swing joint with second swing joint between and second swing joint with third swing joint between all adopt connecting piece and connect, machine tool body, machine tool body includes drive motor, guide plate and chain, drive motor is connected with the drive end of third swing joint through mounting piece, the chain is installed to guide plate, and the chain is driven by drive motor. The utility model can be stably installed in the end of operation instrument, carries out high altitude pruning and fruit picking operation, does not need manual operation, improves the efficiency, can effectively avoid the damage to the fruit at the same time, avoids the mispruning to the branch.

The invention discloses a full-automatic ton bag unpacking machine. Comprising a rack, a sliding rail arranged on the upper portion of the rack, an electric hoist moving along the sliding rail, a bag hanging assembly connected with the electric hoist and a temporary storage hopper assembly arranged in the middle of the rack. The sealing bin assembly is located below the temporary storage hopper assembly and can ascend and descend relative to the temporary storage hopper assembly; the bag opening assembly is arranged on the sealing bin assembly and integrally extends into a sealing bin for operation; the slide rail is used for limiting the motion path of the electric hoist; the bag hanging assembly is used for fixing bag lugs of the ton bag, so that the ton bag is kept in a stable posture in the lifting and moving process; the buffer hopper assembly is used for receiving materials discharged from the ton bags; the sealing bin assembly is in sealing connection with the buffering hopper assembly in the unpacking and discharging process and used for constructing a relatively-closed operation space to restrain dust from escaping. According to the unpacking device, the synergistic effect of automation, sealing and high efficiency is achieved, and dust pollution and manual labor intensity are reduced while the unpacking efficiency is improved.

The utility model relates to the technical field of spinning machines, in particular to a yarn arranging device for a spinning machine, which comprises a device body, the device body comprises a base, a screw rod is arranged on the inner side of the base, a yarn guide head is movably connected to the surface of the screw rod, and a yarn arranging wheel is arranged at the top end of the yarn guide head. A cutting mechanism is arranged on the upper surface of the wire guide head and comprises a supporting frame. By pressing the pressing rod, the cutting knife can slide on the surface of the sliding groove under the action of the pressing rod, the cutting knife is pressed downwards to cut wound yarn, yarn cutting is convenient, the winding length is convenient to control, resetting of the cutting knife can be achieved through the arrangement of the spring, and the cutting knife is convenient to use. Meanwhile, the force generated when the cutting knife is pressed down can be slowly released, the loss of the cutting knife can be reduced, the pressing rod can be limited through the arrangement of the inserting rod, the situation that the yarn is cut by mistake due to the fact that the pressing rod slides down can be effectively avoided, and the consistency of yarn arrangement can be guaranteed.

The invention relates to the technical field of bamboos, and discloses a bamboo sectioning device which comprises a mounting base and a bamboo body, a workbench is arranged above the mounting base, the bamboo body is placed on the workbench, the bamboo body comprises a plurality of bamboo joints, a cutting assembly is further arranged above the workbench, and a driving assembly is further arranged on the workbench; and a first laminating plate and a second laminating plate which are symmetrical to each other are further arranged above the workbench, notches are formed in the bottoms of the first laminating plate and the second laminating plate, and rollers are rotationally arranged in inner cavities of the notches. According to the device, the roller is attached to bamboo through the driving assembly and can move horizontally, the position of a bamboo joint can be judged, and mistaken cutting is avoided; after the balls make contact with the bamboos, the cutting assembly can be driven to deviate and adjust along with downward movement of the circular mounting cylinder, and precise cutting is guaranteed; the driving assembly is in linkage with the rollers, the balls and the cutting assembly, operation is simplified, efficiency is improved, the problems that traditional bamboo cutting is difficult in positioning and low in efficiency are effectively solved, and the bamboo processing requirement is met.

The utility model discloses a saw blade diameter measuring device for magnetic core cutting equipment, which relates to the technical field of processing equipment and comprises a U-shaped support and a saw blade, an air pipe is mounted at one end of the top of the U-shaped support, the saw blade diameter measuring device is mounted at the front end of a magnetic core clamp, and when a lifting mechanism is lifted, air is blown out through the air pipe and an air nozzle. The pressure sensor detects the height which does not reach the bottom of the saw blade after being subjected to the pressure of the gas, and after the pressure sensor rises until the saw blade is inserted into the U-shaped support, the pressure sensor cannot receive the pressure of the gas blown out of the gas nozzle due to the shielding of the saw blade, and it is indicated that the cutting work can be conducted according to the current height of the saw blade. Then, the clamp can be driven to move towards the position of the saw blade through movement of the mobile equipment, cutting work is carried out, the diameter size of the saw blade is measured before cutting, the diameter size change of the saw blade can be accurately detected in real time, and the height of the magnetic core can be adjusted in real time.

The utility model relates to plastic plate slicing equipment, which relates to the technical field of plastic plate processing and comprises a cutting knife, an advancing front scrubbing brush and an advancing rear scrubbing brush are respectively arranged in front of and behind the advancing direction of the cutting knife, and side scrubbing brushes are symmetrically arranged on two sides of the cutting knife. The advancing front scrubbing brush and the advancing rear scrubbing brush are arranged on the front portion and the rear portion of the advancing direction of the cutting knife correspondingly, the side scrubbing brushes are symmetrically arranged on the two sides of the cutting knife, a cutting space is formed, most of chippings generated by cutting are gathered, and the chippings are gathered near the cutting knife, so that the chippings are prevented from being damaged. Meanwhile, due to the action of the advancing front plate brush and the advancing rear plate brush, the advancing front plate brush is used for cleaning the plastic plate, and due to the fact that the cutting knife is in an advancing state, generated splashing chippings are extremely easily collected by the advancing rear plate brush, the chippings are prevented from being directly splashed on the plastic plate, and the cutting efficiency is improved. The impurities on the plastic plate are more and need to be cleaned for multiple times.

The utility model belongs to the field of cables, and particularly relates to an anti-shearing cable, which comprises a cable main body, a central buffer ring is tightly attached to the middle of the cable main body, a side buffer ring is fixedly connected to the outer side of the central buffer ring, and the side buffer ring is tightly attached to the cable main body. The center buffer ring and the side edge buffer rings are made of elastic rubber materials, filling layers are arranged on the outer sides of the center buffer ring and the side edge buffer rings in a tight fit mode, and the filling layers are made of glass fiber materials. According to the utility model, the central buffer ring, the side buffer rings, the filling layer, the fireproof layer, the wear-resistant layer, the armor layer, the first connecting plate and the second connecting plate are matched together, so that the cable main body can be supported when the cable main body faces shearing, the cable can be prevented from being extruded by external force, the fluorescent coating can enhance the warning effect of the cable, and the service life of the cable is prolonged. Workers are prevented from cutting the cable by mistake, and anti-cutting protection can be carried out on the cable interface.

The application provides a short message sending quality monitoring system and method based on machine learning. The delay tolerance in the short message sending process is obtained by performing delay constraint on the short message sending process through the delay fluctuation characteristics in the short message sending process, the network delay of the short message sending environment and the preset basic timeout threshold. The confidence adjustment of the basic timeout threshold in the short message sending is performed based on the delay tolerance, the confidence determination interval of the timeout threshold is obtained, and then the degradation characteristics of the communication channel timeout event in the short message sending process are extracted. The degradation characteristics of the timeout event and the historical delivery rate of the short message sending are input into the intelligent decision model of the communication channel quality, and the continuous timeout threshold of the communication channel in the short message sending process is output. The reliability of the communication channel quality is evaluated based on the continuous timeout times in the short message sending process and the continuous timeout threshold of the communication channel. The time sequence degradation evaluation of the channel quality under the short message sending timeout state can be realized based on the above scheme.

The utility model belongs to the field of warning cables, and particularly relates to a buried warning cable, which comprises a cable main body, an upper protection structure is fixedly connected above the outer wall at the joint of the cable main body, and a lower protection structure is fixedly connected below the outer wall at the joint of the cable main body. When the upper protection structure and the lower protection structure are in a fixed state, the middle position is in a circular hollow shape, the cable main body comprises a core body and a fastening sleeve, the core body is arranged in the middle position of the cable main body, and the outer wall of the core body is bonded with the fastening sleeve through glue; according to the utility model, the joint of the cable main body can be protected through the cooperation of the upper protection structure and the lower protection structure, so that the joint can be prevented from being bent and even fractured in the construction process in the pavement maintenance construction process, the safety of buried installation of the cable is improved, and the service life of the cable is prolonged. The fluorescent agent in the filling ring can enhance the warning effect of the cable, and the reinforcing protection layer can play a role in bending resistance.

The present invention discloses a mattress edge locking machine, which relates to the technical field of mattress production and processing; in order to perform more rigorous edge locking on the rounded corners while ensuring product quality; specifically includes a main frame, a feeding conveyor belt, a processing conveyor belt, a lining belt conveying mechanism, an edge locking mechanism, a cutting mechanism and an anti-miscutting mechanism, wherein the processing conveyor belt is arranged on the inner walls on both sides of the main frame, and the feeding conveyor belt is arranged on the inner walls on the other two sides of the main frame; the lining belt conveying mechanism includes a lining belt mounting frame for installing the edge locking lining belt, a lining belt conveying motor, a lining belt conveying wheel and an adjustable feeding group, the lining belt conveying mechanism is arranged below one side of the processing conveyor belt, and the edge locking lining belt is wound around the outer wall of the lining belt mounting frame. The present invention can improve the quality of the edge locking of the rounded corners of the mattress by arranging a guide plate and a guide seam, and can protect the mattress when the cutting mechanism cuts the edge locking lining belt by arranging a protective cylinder and a protective head to prevent miscutting.

The utility model discloses a film cutting machine for a film, which comprises a film cutting machine main body, a mandrel, a stabilizing frame and a cutting device, and is characterized in that a positioning disc is fixedly and annularly arranged on the outer wall of the mandrel, a plurality of sliding grooves are formed in the positioning disc in a penetrating manner, and the positioning disc is uniformly and annularly arranged along the axis of the positioning disc; clamping blocks which are located on the sliding grooves, correspond to the sliding grooves in a one-to-one mode and are used for clamping the film roll are arranged at one end of the positioning disc in a sliding mode, a rotating ring groove is annularly formed in the side, close to the film cutting machine body, of the positioning disc on the mandrel, a rotating ring is rotationally arranged in the rotating ring groove, and a control disc is fixedly arranged on the outer wall of the rotating ring in a surrounding mode; a plurality of sliding grooves corresponding to the sliding grooves are evenly formed in the control disc around the circle center of the control disc, sliding shafts which penetrate through the sliding grooves and are fixedly connected with the clamping blocks are arranged in the control grooves in a sliding mode, and a rotating mechanism for controlling the rotating ring to rotate is arranged on the mandrel. And the clamping blocks are controlled to move through the sliding shafts, so that the film is clamped, the film and the core shaft do not rotate relatively, and the cutting quality is guaranteed.

The utility model discloses a stainless steel test pile steel pipe cutting machine, which relates to the technical field of stainless steel processing and comprises an operating platform, a blanking hopper is mounted on the operating platform, a discharging channel is arranged on the blanking hopper, a blanking component is arranged on the discharging channel, and an infrared sensor is mounted on one side of the discharging channel. The operating platform is connected with a first lower clamping plate through an electric sliding table, the other end of the electric sliding table is connected with a second lower clamping plate, clamping assemblies are arranged on the first lower clamping plate and the second lower clamping plate, and a baffle is fixedly arranged on one side of the first lower clamping plate; an adjusting mechanism for rotating the pipe fitting is mounted on the operating platform; a laser cutting head is installed on the operation platform through a first supporting frame. Through the arrangement of the clamping assembly and the baffle, one end of the pipe fitting can be limited, the size deviation caused by suspension vibration is effectively reduced, and the cutting precision is guaranteed.

The invention belongs to the technical field of medical instruments, and discloses a polyp marking method under an enteroscope, which comprises the following steps: the enteroscope examines the intestinal tract of a patient for the first time, determines the first position of a to-be-marked polyp, and pushes a marking assembly containing an absorbable suture and a top connecting clamping piece to the first position through an endoscopic pipeline after the to-be-marked polyp is found; the clamping piece is clamped on the surface of the to-be-marked polyp, meanwhile, the absorbable suture is arranged at a second position in the intestinal tract, during secondary examination, the clamping piece is tracked according to the absorbable suture at the second position, and the position of the to-be-marked polyp is determined. According to the method, multi-dimensional marking is achieved, a doctor can more quickly and accurately find out polyps, blind finding is avoided, the positioning accuracy is improved, the time and energy for finding out the polyps are shortened, discomfort and pain of a patient are relieved, repeated stimulation injuries of intestinal mucosa are reduced, mistaken cutting and missing cutting are avoided, and the treatment accuracy and effectiveness are improved; the invention provides a reliable means for diagnosis and treatment of intestinal polyp, and has important clinical application value.

This utility model discloses a minimally invasive surgical shaving head, relating to the field of medical device technology. To address the problems of easy clogging of the shaving tube during the removal of diseased tissue and the increased risk of accidental injury during pressure cutting in existing technologies, the following technical solution is proposed: This utility model includes an inner shaving seat, an outer shaving seat, an outer shaving tube, an inner shaving tube, a cutting window, and a cutting edge. A cutting window is provided on the side of the end of the outer shaving tube, consisting of two waist-shaped holes arranged in an "X" shape. The outer shaving seat is fixedly located at the end of the outer shaving tube away from the cutting window. The inner shaving tube is located inside the outer shaving tube, and a cutting edge is provided at the position corresponding to the cutting window on the inner shaving tube. The inner shaving seat is fixedly located on the inner shaving tube away from the cutting edge. This utility model, through the cooperation of the "X"-shaped cutting window and the inclined blade, uses a segmented cutting stroke to preferentially aspirate the cut tissue fragments under continuous negative pressure, effectively avoiding the problem of excessive accumulation of loose tissue in the inner shaving tube cavity, thus preventing clogging.

The invention is suitable for the technical field of geometric modeling and constraint solving, and provides a geometric constraint solving method, which comprises the following steps: acquiring first data input by a user; the first data comprises a plurality of first geometric objects and a first constraint relationship corresponding to each first geometric object; creating a constraint graph according to the first data; cutting the constraint graph to obtain at least one cut first constraint sub-graph; the first constraint subgraph is a constraint subgraph which cannot be cut in the constraint graph; each first constraint sub-graph is solved; obtaining a first solving result corresponding to each first constraint sub-graph; under the condition that all the first solving results show that solving is successful, cutting each first constraint sub-graph until all the first constraint sub-graphs are completely cut; and solving the plurality of second constraint sub-graphs to obtain a geometric model corresponding to the first data. The method meets the scene requirements of high-precision manufacturing, scientific calculation and the like which have extremely high requirements on geometric certainty.

This invention discloses a gear cutting machine tool with a measuring tool function, relating to the field of gear cutting technology. The invention includes a cutting table, a gantry frame mounted on top of the cutting table, a laser cutting assembly installed on the inner top of the gantry frame, a lifting cylinder mounted on top of the gantry frame, and a cutting module fixedly mounted at the bottom of the telescopic end of the lifting cylinder. A bottom mold is fixedly mounted at the bottom of the mounting shaft, and several adjustable molds are provided on the top of the bottom mold. Both the bottom mold and the adjustable molds have cooling chambers located at the gear teeth. This invention adopts an integrated mold shielding and cooling design, which can prevent accidental cutting, provide a measuring tool for the gear, and, based on the high heat flow density at the tooth tip and root, set cooling channels in corresponding areas to achieve precise thermal management. It integrates cutting guidance and active cooling into the same mold, resulting in a compact structure and multifunctional design.

The invention relates to a laminated alloy frame and a manufacturing method thereof.The manufacturing method comprises the steps that a first alloy frame is provided, the first alloy frame comprises an upper surface and a lower surface which are opposite, and the upper surface of the first alloy frame is provided with at least two positioning protrusions; a second alloy frame is provided, the second alloy frame comprises an upper surface and a lower surface which are opposite to each other, at least two positioning grooves are formed in the lower surface of the second alloy frame, and the positions of the positioning grooves correspond to the positions of the positioning protrusions; and the lower surface of the second alloy frame is pressed on the upper surface of the first alloy frame, and the positioning protrusions are embedded in the corresponding positioning grooves during pressing. The position precision and the overlap ratio of the first alloy frame and the second alloy frame in the press fit process are improved, the dislocation risk in the press fit process of the first alloy frame and the second alloy frame is prevented, and therefore mistaken cutting of a main body (the first main body area) of the first alloy frame located on the lower layer is avoided.