Environment-friendly powder metallurgy processing residue recovery unit
Technical Field
The invention relates to the technical field of metallurgical residue recovery devices, in particular to an environment-friendly powder metallurgy processing residue recovery device.
Background
The powder metallurgy is an advanced manufacturing process for manufacturing metal parts or materials through sintering after metal powder is pressed and molded, has the advantages of high material utilization rate, low energy consumption, high product size precision and the like, and is widely applied to various fields of automobiles, machines, electrons and the like, however, in the production process of the powder metallurgy, particularly in the processes of forming, sintering and subsequent processing and polishing, a large amount of metal powder residues, cutting scraps and sweeps are often generated, if the residues are not subjected to effective crushing and recycling treatment, the waste of metal resources is caused, the production cost is increased, and meanwhile, a large amount of fine powder is suspended in the air, so that dust pollution is possibly caused, and even potential safety hazards such as explosion exist.
Through retrieving, discovery prior art publication number is CN108852152A, disclosed a powder metallurgy processing residue recovery unit, including pressing the briquetting, the movable rod, spacing snap ring, the clamp plate, the dust collecting shell, the dust absorption pipe, the fan, flitch and slag inlet, the pressing block sets up at the movable rod top, the annular side of movable rod is equipped with spacing snap ring, the movable rod sets up in sealed lid intermediate position, the clamp plate is installed to the movable rod bottom, the problem that original powder metallurgy processing residue recovery unit accomodates the inefficiency has been solved, the dust collecting shell is installed in recycling bin annular side upside, dust collecting shell right-hand member face is equipped with the dust absorption pipe, dust collecting shell inside upside is equipped with the fan, the fan downside is provided with the flitch, the flitch left side is provided with into the slag inlet, this scheme has solved the not enough thorough problem of original powder metallurgy processing residue recovery unit recovery.
Therefore, based on the above searching and combining the prior art, although part of the device has a certain screening or collecting function, the device generally lacks an effective crushing and scattering mechanism for metal residues, particularly for agglomerated and agglomerated metal powder formed in the processing process, the agglomerated residues are difficult to sufficiently crush and scatter in time, the agglomerated residues cannot be successfully recovered through a screening system, the overall recovery efficiency and the product purity are affected, meanwhile, in the magnetic absorption recovery link, due to the lack of a stirring and conveying coordination mechanism for the adsorbed powder, the metal powder adsorbed on the surface of a conveyor belt is easy to gradually accumulate and gather, and finally the conveying system is blocked or blocked, the continuous and stable operation of the device is affected, and the maintenance difficulty and the cost are increased.
Disclosure of Invention
The invention aims to provide an environment-friendly powder metallurgy processing residue recycling device, which aims to solve the problems in the background technology.
The technical scheme is that the environment-friendly powder metallurgy processing residue recycling device comprises a sorting barrel, an energy-saving motor is fixedly arranged at the upper end of the sorting barrel, a screening net for screening fine metal powder is fixedly arranged at the inner end of the sorting barrel, two rectangular holes are formed in the outer surface of the screening net, supporting surface shells are detachably arranged in the rectangular holes, a plurality of fine holes are formed in the inner end of the supporting surface shells, metal fine powder can pass through the supporting surface shells, a center rod is fixedly connected to the output end of the energy-saving motor, the center rod penetrates through the screening net, a plurality of fan blades are fixedly arranged on the outer surface of the center rod through bolts, zigzag protrusions are arranged at the edges of the fan blades, used for scattering agglomerated metal powder, an adsorption device capable of recycling the metal powder is arranged inside the supporting surface shells, a crushing hammer is fixedly connected to one end, far away from the screening net, of the center rod, through bolts, the crushing hammer is driven to rotate, and when the crushing hammer rotates, the powder at the inner bottom of the sorting barrel is enabled to be in a rotary mode, and then the fan blades are enabled to perform a rotary action under the action of beating and agglomeration.
As a further scheme of the invention, under the driving action of the energy-saving motor, the center rod blows up the metal fine powder in the sorting cylinder when the fan blades rotate, and the metal fine powder respectively passes through the screening net and the supporting surface shell under the rotating action of the fan blades and finally falls back to the bottom end in the sorting cylinder, and the air flow generated by the rotation of the fan blades enables the metal fine powder to be uniformly lifted up, so that the screening net and the supporting surface shell are fully passed, and the sorting precision and the sorting efficiency are improved.
As a further scheme of the invention, the adsorption device comprises a plurality of isolation sleeves, the isolation sleeves are fixedly arranged at the inner end of the supporting surface shell, a plurality of lining pipes are arranged in the supporting surface shell, the lining pipes are arranged between two corresponding isolation sleeves, a plurality of conveying belts are sleeved on the outer surfaces of the lining pipes, the conveying belts are annularly arranged, a plurality of holes are uniformly distributed on the outer surfaces of the lining pipes, electromagnets are fixedly arranged in each hole, and the electromagnets are positioned in the conveying belts.
As a further scheme of the invention, when dust in the sorting cylinder is raised, metal substances in the dust can be attached to the outer surface of the conveying belt under the action of the magnetic force of the electromagnet, then the metal powder is brought into the inner liner tube through the rotation of the conveying belt, and the selective adsorption of different metal powders is realized by the adjustable magnetic force characteristic of the electromagnet, so that the metal recovery purity is effectively improved.
As a further scheme of the invention, a plurality of driven shafts are rotatably arranged on the outer surface of the isolation sleeve at the upper side of the inner part of the supporting surface shell, each driven shaft corresponds to the conveyor belt, supporting wheels are fixedly arranged on the outer surfaces of the driven shafts, and the supporting wheels are respectively positioned at two end parts of the driven shafts and are in contact with the outer surfaces of the conveyor belt.
As a further scheme of the invention, the outer surface of the lining pipe is provided with the sliding groove, the driving belt is embedded in the sliding groove, the driving toothed ring is rotatably arranged on the outer surface of the lining pipe through the rotating shaft, the sliding groove is arranged on the outer surface of the lining pipe, the driving belt is embedded in the sliding groove, and the driving toothed ring is rotatably arranged in cooperation with the rotating shaft, so that stable transmission and accurate synchronous control of a driving mechanism are realized, the transmission efficiency and the operation stability of a transmission system are effectively improved, and transmission faults caused by slipping or shifting in the transmission process are reduced.
As a further scheme of the invention, the inner end of the driving belt is fixedly provided with a toothed belt, the toothed belt is meshed with the driving toothed ring, a plurality of driving blocks are uniformly distributed along the track of the driving belt and penetrate through the inner end of the driving belt, and the lifting strip is fixedly arranged in the sliding groove and is positioned in one side of the sliding groove.
As a further scheme of the invention, the driving ring is rotatably arranged at the bottom end of the inner side of the screening net, the guide pipe is fixedly arranged on the outer surface of the screening net, the suction pipe is fixedly connected with the outer surface of the guide pipe, and the driving ring is arranged at the bottom end of the inner side of the screening net and matched with the guide pipe arranged at the outer surface of the screening net and the suction pipe connected with the guide pipe, so that the screened qualified metal powder can be guided to be conveyed to the inlet of the suction pipe in a directional manner in the screening process, the powder is prevented from accumulating or scattering secondarily in the screening net, and the recovery efficiency and the collection purity of the metal powder are improved.
As a further scheme of the invention, the inner end of the screening net is penetrated with the driving rod, one end of the driving rod, which is close to the driving ring, is fixedly connected with the transfer gear, the outer surface of the driving ring is fixedly provided with the driven toothed ring, the driven toothed ring is meshed with the transfer gear, the meshed transmission is realized by arranging the driving rod at the inner end of the screening net and arranging the transfer gear at one end, which is close to the driving ring, of the driving ring and matching with the driven toothed ring arranged on the outer surface of the driving ring, the rotation motion of the center rod can be stably transmitted to the driving ring after being decelerated by the gear, the uniform rotation of the screening assembly under a proper rotation speed is ensured, the stable screening process is facilitated, the screening efficiency reduction or the insufficient screening precision caused by the too fast or uneven screening speed is avoided, and the screening purity and the recovery effect of metal powder are further improved.
As a further scheme of the invention, the outer surface of the screening net is sleeved with the chain ring, the chain ring is arranged in the guide pipe in a penetrating way, one end of the driving rod, which is far away from the transfer gear, is fixedly connected with the chain wheel, the chain wheel is meshed with the chain ring, the scraping block is fixedly arranged on the outer surface of the chain ring, when the chain ring rotates, the scraping block pushes metal powder in the guide pipe to the inlet of the suction pipe, the scraping block is arranged on the outer surface of the screening net, and when the chain ring rotates under the driving of the chain wheel, the scraping block can effectively continuously push the metal powder accumulated in the guide pipe to the inlet of the suction pipe, so that the retention, accumulation or blockage of the metal powder in the guide pipe is avoided, smooth conveying and efficient collection of the metal powder are realized, the recovery efficiency is improved, and the continuous and stable operation of the recovery system is ensured.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the invention, the crushing hammer and the fan blades with the saw-tooth-shaped protrusions are arranged in the sorting barrel, so that the agglomerated metal powder in the processing residues can be fully beaten and scattered under the drive of the central rod, the screening and recycling effects are prevented from being influenced by powder agglomeration, the rotation of the fan blades not only provides necessary scattering force, but also forms stable rotary air flow in the sorting barrel, so that dust-shaped metal fine powder can be lifted up to enter the screening and recycling link, and coarse residues with particle sizes not meeting the requirements can be effectively separated by matching with the multi-stage screening structure of the screening net and the supporting surface shell, and the purity of the recycled materials is improved;
2. The electromagnet adsorption device is arranged in the adsorption recovery link, so that metal components can be efficiently separated in the process of lifting metal powder in dust, and the metal components can be transported into the lining pipe by means of the conveyor belt to be collected in a concentrated manner;
3. In order to prevent aggregation and agglomeration of metal powder adsorbed on a conveyor belt, a decomposition rod is arranged on the outer surface of a driven shaft, and the decomposition rod and the conveyor belt rotate cooperatively to continuously stir the attached metal powder, so that blockage and accumulation are avoided, and recovery efficiency and continuous stability are improved;
4. The energy-saving motor adopted by the invention is a permanent magnet synchronous motor, realizes high-efficiency energy conversion by utilizing the magnetic field of the permanent magnet, can obviously reduce energy consumption, improves driving efficiency, meets the green manufacturing requirement, and can intelligently adjust output power according to load change by matching with a frequency converter to control the rotating speed of the motor, thereby realizing energy-saving operation and stable driving and improving the automatic adaptability and operating efficiency of the whole machine.
Drawings
FIG. 1 is a schematic structural view of an environment-friendly powder metallurgy processing residue recycling device;
FIG. 2 is a schematic view of the structure of the interior of the sorting barrel;
FIG. 3 is a schematic view of the structure of the inside of a screening net;
FIG. 4 is a disassembled view of the adsorption apparatus;
FIG. 5 is a schematic view of the structure of the spacer and the driven shaft;
FIG. 6 is a disassembled view of the inner liner and the drive belt;
FIG. 7 is a schematic view of the structure of the inside of a screening net;
FIG. 8 is a schematic view of the structure of the scraper and the conveyor belt;
FIG. 9 is a cross-sectional view of a pass-through tube;
FIG. 10 is a state diagram of the residue lift;
Fig. 11 is a diagram of the motion trace of the drive block and the lift bar.
In the figure, 1, a sorting cylinder, 2, an energy-saving motor, 3, a sealing cover, 4 and a bottom cover;
101. Suction pipe, 102, center rod, 103, screening net, 104, fan blade, 105 and mincing hammer;
201. Supporting surface shell, 202, isolating sleeve, 203, conveyor belt, 204, driven shaft, 205, lining pipe, 206, electromagnet, 207, driving belt, 208, sliding groove, 209, driving toothed ring, 210, decomposing rod, 211, driving block, 212, lifting strip, 213, wheel hub motor, 214, tensioning wheel;
301. Driving ring 302, conducting pipe 303, driven toothed ring 304, transfer gear 305, driving rod 306, chain wheel 307, chain ring 308, scraping block 309, baffle plate 310 and scraping plate.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
1 Referring to fig. 1-3 and 10, an environment-friendly powder metallurgy processing residue recycling device comprises a sorting cylinder 1, wherein an energy-saving motor 2 is fixedly arranged at the upper end of the sorting cylinder 1 through bolts, a screening net 103 for screening fine metal powder is fixedly arranged at the inner end of the sorting cylinder 1 through a clamp, two rectangular holes are formed in the outer surface of the screening net 103, a supporting surface shell 201 is detachably arranged in each rectangular hole, a plurality of fine holes are formed in the inner end of the supporting surface shell 201, metal fine powder can pass through the supporting surface shell, the supporting surface shell 201 is specifically detachably connected with the screening net 103 through bolts, and a related technician can detach the supporting surface shell and maintain the supporting surface shell;
The energy-saving motor 2 is a permanent magnet synchronous motor, the temperature rise of a winding is monitored in real time by an integrated temperature sensor, the shell of the energy-saving motor 2 adopts an oil-free sealing design, the interior of the shell is filled with environment-friendly silicone grease, the rotating speed is regulated by a frequency converter, the oil-free sealing and the environment-friendly silicone grease filling avoid secondary pollution risks caused by lubricating oil leakage, the high-standard environment-friendly requirement is met, the permanent magnet synchronous motor is combined with a variable frequency speed regulation technology, the energy utilization rate is improved, the dynamic adjustment can be realized according to the actual crushing load, and the high energy consumption phenomenon of the full-load blind operation of the traditional motor is avoided;
it should be noted that, the temperature sensor, the frequency converter and the energy-saving motor 2 are all existing mature technologies, and are not described in detail herein;
The output end of the energy-saving motor 2 is fixedly connected with a center rod 102 through a bolt, the center rod 102 is arranged in the screening net 103 in a penetrating way, the outer surface of the center rod 102 is fixedly provided with a plurality of fan blades 104 through the bolt, the edges of the fan blades 104 are provided with saw-tooth-shaped protrusions for scattering agglomerated metal powder, the fan blades 104 are positioned in the screening net 103, the center rod 102 blows up the metal fine powder in the sorting cylinder 1 when the fan blades 104 rotate under the driving action of the energy-saving motor 2, and after the metal fine powder is lifted up in the sorting cylinder 1, the metal fine powder passes through the screening net 103 and the supporting surface shell 201 respectively under the rotating action of the fan blades 104 and finally falls back to the inner bottom end of the sorting cylinder 1 to reciprocate (as shown in fig. 10);
an adsorption device capable of recovering the metal powder is provided inside the support surface case 201.
Specifically, a feed inlet is formed in the outer surface of the sorting barrel 1, a sealing cover 3 is arranged at the feed inlet, the sealing cover 3 is positioned on the upper side of the sorting barrel 1 and is rotationally connected with the sorting barrel 1 through a rotating shaft, after powder is poured into the sorting barrel 1, the feed inlet is sealed through the sealing cover 3, and dust exposure of the device in the air in the operation process is avoided;
The downside of letter sorting section of thick bamboo 1 is coniform, and the bottom of letter sorting section of thick bamboo 1 can be dismantled and be connected with bottom 4, opens bottom 4 after, takes out the powder after the separation.
Referring to fig. 3-7, an environment-friendly powder metallurgy processing residue recycling device is disclosed, based on the basis of embodiment 1, a driving ring 301 is rotatably installed at the bottom end of the inner side of a screening net 103, a crushing hammer 105 is fixedly connected to one end of a center rod 102, which is far away from the screening net 103, through a bolt, the crushing hammer 105 is positioned below the driving ring 301, specifically, the center rod 102 is in transmission connection with the driving ring 301 through a reduction gearbox, the center rod 102 drives the crushing hammer 105 to rotate, the driving ring 301 rotates at a reduced rotating speed, and when the crushing hammer 105 rotates, caking powder at the bottom of the inner side of a sorting cylinder 1 is beaten, so that the caking powder is lifted under the action of rotating air flow of a fan blade 104 after being crushed;
The adsorption device comprises a plurality of isolation sleeves 202, wherein the isolation sleeves 202 are fixedly welded at the inner ends of a supporting surface shell 201, and specifically, every two isolation sleeves 202 are divided into a group and are respectively positioned at the upper end and the lower end of the inner side of the supporting surface shell 201, a plurality of lining pipes 205 are arranged in the supporting surface shell 201, the lining pipes 205 are arranged between the two corresponding isolation sleeves 202, a plurality of conveying belts 203 are sleeved on the outer surfaces of the lining pipes 205, and the conveying belts 203 are annularly arranged;
More specifically, tensioning wheels 214 are rotatably installed at the upper end and the lower end of the lining pipe 205, a conveyor belt 203 is in tensioning sleeve arrangement on the outer surfaces of the two tensioning wheels 214, a plurality of holes are uniformly distributed on the outer surface of the lining pipe 205, electromagnets 206 are fixedly installed in each hole, the electromagnets 206 are arranged along the vertical direction, the magnetic force can be changed by adjusting current, so that powder sorting requirements of different metal properties can be met, the electromagnets 206 are located in the conveyor belt 203, and the specific working principle of the electromagnets 206 is the existing mature technology and is not repeated herein;
When the dust in the sorting cylinder 1 is lifted, the dust passes through the supporting surface shell 201 under the rotation of the fan blades 104, and metal substances in the dust are attached to the outer surface of the conveyor belt 203 under the action of the magnetic force of the electromagnet 206, and then the metal powder is brought into the interior of the lining pipe 205 by the rotation of the conveyor belt 203.
As shown in fig. 4 to 7, if a large amount of metal dust is attached to the outer surface of the conveyor belt 203, the powder passes through the spacer 202 and then the gap between the spacer 202 and the conveyor belt 203 is blocked, in order to break up the metal dust collected on the outer surface of the conveyor belt 203, a plurality of driven shafts 204 are rotatably mounted on the outer surface of the spacer 202 on the upper side of the inner portion of the supporting surface shell 201, each driven shaft 204 corresponds to the conveyor belt 203, supporting wheels are fixedly welded on the outer surface of each driven shaft 204, the supporting wheels are respectively positioned at two ends of the driven shaft 204 and are in contact with the outer surface of the conveyor belt 203, specifically, the outer surface of each supporting wheel is fixedly provided with a skid-proof block, and is in contact with the outer surface of the conveyor belt 203, so that when the conveyor belt 203 rotates, the driven shafts 204 are driven by the skid-proof blocks, a plurality of decomposition bars 210 are fixedly welded on the outer surface of the driven shafts 204, and the decomposition bars 210 are annularly arranged, and when the metal powder attached to the outer surface of the conveyor belt 203 is collected together, the decomposition bars 210 stir the metal powder collected on the outer surface of the conveyor belt 203 under the action of the rotation of the driven shaft 204.
As shown in fig. 6-8 and 11, a sliding groove 208 is formed in the outer surface of the lining pipe 205, a driving belt 207 is embedded in the sliding groove 208, a driving toothed ring 209 is rotatably mounted on the outer surface of the lining pipe 205 through a rotating shaft, a hub motor 213 is fixedly mounted at the inner end of the driving toothed ring 209 and is in rotary connection with the lining pipe 205, the driving toothed ring 209 and the hub motor 213 are integrally embedded into the lining pipe 205, the outer surface of the driving toothed ring 209 is kept flush with the outer wall of the lining pipe 205, a toothed belt (not shown in the drawings) is fixedly mounted at the inner end of the driving belt 207 and meshed with the driving toothed ring 209, a plurality of driving blocks 211 are uniformly distributed along the track of the driving belt 207 and penetrate through the inner end of the driving belt 207, the track of the sliding groove 208 is elliptical, lifting strips 212 are fixedly mounted in the inner part of the sliding groove 208 and are positioned in one side of the sliding groove 208, and both end parts of the lifting strips 212 are subjected to chamfering treatment, so that the driving blocks 211 can smoothly move from the chamfering guiding action to the outer surface of the lifting strips 212 (shown in fig. 11);
the inner end of the conveyor belt 203 is provided with a plurality of passive grooves which are uniformly distributed along the track of the driving belt 207, and the size of the passive grooves is the same as that of the driving block 211;
Specifically, the lining pipe 205 is made of metal, an induction magnetic field is generated under the action of magnetic force of the electromagnet 206, the driving block 211 is made of metal, and the driving block 211 contracts and moves towards the sliding groove 208 under the action of the induction magnetic field, so that when the driving block 211 passes through the lifting strip 212, the driving block 211 moves towards a direction away from the lining pipe 205 under the extrusion of the lifting strip 212, and then the driving block 211 is embedded into a passive groove of the conveying belt 203, and when the driving belt 207 moves, the driving block 211 drives the conveying belt 203 to synchronously move.
As shown in fig. 7-9, a conducting pipe 302 is fixedly installed on the outer surface of the screening net 103 through a clamp, a suction pipe 101 is fixedly connected to the outer surface of the conducting pipe 302, the output end of the suction pipe 101 extends out of the sorting cylinder 1, the conducting pipe 302 is communicated with the lining pipe 205, specifically, a scraper 310 is arranged in the lining pipe 205, the scraper 310 is attached to the outer surface of the conveyor belt 203, and then metal powder coming to the position is scraped by the scraper 310 and falls into the interior of the conducting pipe 302;
The inner end of the screening net 103 is penetrated with a driving rod 305, one end of the driving rod 305, which is close to the driving ring 301, is fixedly welded with a transfer gear 304, the outer surface of the driving ring 301 is fixedly provided with a driven toothed ring 303, the driven toothed ring 303 is meshed with the transfer gear 304, and particularly, a meshing transmission mechanism of the driven toothed ring 303 and the transfer gear 304 is completely sealed inside the supporting surface shell 201 (shown in fig. 7), so that the invasion of fine metal powder is effectively isolated, the abrasion degree of transmission parts is obviously reduced, and the service life of equipment is prolonged.
The outer surface of the screening net 103 is sleeved with a chain ring 307, the chain ring 307 is arranged in the conducting pipe 302 in a penetrating manner, one end of the driving rod 305, which is far away from the transfer gear 304, is fixedly welded with a chain wheel 306, the chain wheel 306 is meshed with the chain ring 307, a scraping block 308 is fixedly arranged on the outer surface of the chain ring 307, when the chain ring 307 rotates, the scraping block 308 pushes metal powder in the conducting pipe 302 to the inlet of the suction pipe 101, a baffle 309 is arranged at the junction between the conducting pipe 302 and the chain ring 307, the baffle 309 is made of rubber, a certain isolation effect is achieved, and non-metal powder is prevented from entering the conducting pipe 302;
The sorting cylinder 1 is equipped with a dust collector (for example, nilfisk Aero26-21 PC, DELFIN SMART Flow ATEX) capable of extracting metal dust, the input end of the dust collector is communicated with the suction pipe 101, and the metal dust in the guide pipe 302 is extracted by suction force.
The working principle of the invention is as follows:
When the dust-collecting device is used, the sealing cover 3 is opened, residues are poured into the sorting barrel 1, the energy-saving motor 2 is started, the fan blades 104 are driven to rotate through the center rod 102, dust in the sorting barrel 1 is lifted, then the dust passes through the screening net 103 and holes on the outer surface of the supporting surface shell 201 under the attractive force of the fan blades 104, meanwhile, metal powder is attached to the outer surface of the conveying belt 203 under the action of the magnetic force of the electromagnet 206, and the metal powder without the magnetic force can sweep the conveying belt 203;
Meanwhile, the hub motor 213 drives the driving gear ring 209 to rotate, then the driving gear ring 209 drives the driving belt 207 to rotate, then the driving block 211 on the outer surface of the driving belt 207 drives the conveying belt 203 to rotate under the action of the lifting bar 212, at this time, the metal powder attached to the outer surface of the conveying belt 203 can come into the inner liner tube 205 and is scraped by the scraping plate 310, then the scraped metal powder falls into the inner part of the guide tube 302, meanwhile, the driving ring 301 rotates at a low speed under the action of the reduction gearbox, and the driven gear ring 303 drives the transfer gear 304 to rotate, then the transfer gear 304 drives the sprocket 306 to rotate through the driving rod 305, at this time, the chain ring 307 drives the scraping block 308 to scrape the metal powder in the inner part of the guide tube 302 to the inlet of the suction tube 101 under the driving action of the sprocket 306, then the metal powder is pumped by the dust collector, and the residual residues are taken out through the discharge hole at the bottom end of the sorting tube 1.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art who is skilled in the art to which the present invention pertains should cover the scope of the present invention by equally replacing or changing the technical scheme and the inventive concept thereof.