阅读说明：本技术 一种丝网及薄板专用激光等离子切割机 (Special laser plasma cutting machine for silk screen and thin plate ) 是由 闫喜庆 于 2019-12-05 设计创作，主要内容包括：一种丝网及薄板专用激光等离子切割机,包括机架,所述机架上并列设置若干用于输送工作对象的辊轴,所述辊轴的轴头分别设置相互啮合的传动齿轮,其中,在相互啮合的传动齿轮组合中的首端齿轮和尾端齿轮的轴头上分别通过联轴器连接设置同步齿轮箱伺服电机。所述辊轴上设有若干卡簧槽,所述卡簧槽中设有拉簧。利用齿轮轴和同步带、同步轮、伺服电机和从动齿轮组,共同协作保证同步运动减小反向间隙。用联轴器对接带动相应的辊轴转动,实现材料的送料切割,用减小辊轴间距和辊轴拉簧制约了材料不平整造成的送料不稳定。(The utility model provides a special laser plasma cutting machine of silk screen and sheet metal, includes the frame, set up a plurality of rollers that are used for carrying the work object in parallel in the frame, the spindle nose of roller sets up intermeshing's drive gear respectively, wherein, sets up synchronous gear box servo motor through the coupling joint respectively on the spindle nose of head end gear and tail end gear in the drive gear combination of intermeshing. The roll shaft is provided with a plurality of clamp spring grooves, and tension springs are arranged in the clamp spring grooves. The gear shaft, the synchronous belt, the synchronous wheel, the servo motor and the driven gear set are utilized to cooperate together to ensure that the synchronous motion reduces the reverse clearance. The corresponding roll shafts are driven to rotate by the butt joint of the shaft couplings, so that the feeding and cutting of materials are realized, and the instability of feeding caused by the unevenness of the materials is limited by reducing the distance between the roll shafts and the tension springs of the roll shafts.)

1. The utility model provides a special laser plasma cutting machine of silk screen and sheet metal, its characterized in that, includes frame (1), set up a plurality of roller (2) that are used for carrying the work object side by side on frame (1), the spindle nose of roller (2) sets up intermeshing's drive gear (31) respectively, wherein, sets up synchromesh gear box servo motor (4) through the coupling joint respectively on the spindle nose of head end gear and tail end gear in intermeshing drive gear (31) combination.

2. The laser plasma cutting machine special for silk screens and thin plates as claimed in claim 1, wherein the head end gear and the tail end gear are respectively provided with a synchronous pulley (41), and the synchronous pulleys (41) are connected through a synchronous belt (42).

3. The laser plasma cutting machine special for the silk screen and the thin plate as claimed in claim 2, wherein two or more than two transmission gears (31) are respectively arranged on the shaft heads of the roll shafts (2) and meshed with each other, and synchronous tension wheels (43) are further arranged on the shaft heads of the two or more than two transmission gears (31), and the synchronous tension wheels (43) are meshed with the synchronous belts (42).

4. The laser plasma cutting machine special for silk screens and thin plates as claimed in claim 1, wherein transition transmission gears (32) are further arranged between each transmission gear (31) in the transmission gears (31) which are meshed with each other and are respectively arranged at the shaft heads of the roll shafts (2).

5. The special laser plasma cutting machine for silk screens and thin plates as claimed in any one of claims 1 to 4, wherein a plurality of clamp spring grooves (20) are arranged on the roller shaft (2), and tension springs (21) are arranged in the clamp spring grooves (20).

6. The laser plasma cutting machine special for silk screens and thin plates as claimed in claim 5, characterized in that the clamp spring grooves (20) are arranged on each roller shaft (2) in alignment.

7. The laser plasma cutting machine special for silk screens and thin plates as claimed in any one of claims 1 to 4, characterized in that the surface of the roller shaft (2) is provided with a knurling structure layer.

8. The laser plasma cutting machine special for silk screens and thin plates as claimed in any one of claims 1 to 4, characterized in that the surface of the roller (2) is provided with an encapsulating structure layer.

9. The laser plasma cutting machine special for silk screens and thin plates as claimed in any one of claims 1 to 4, characterized in that the roller shafts (2) comprise a plurality of roller shafts (2) provided with knurled structural layers and a plurality of roller shafts (2) provided with encapsulated structural layers, and the plurality of roller shafts (2) provided with knurled structural layers and the plurality of roller shafts (2) provided with encapsulated structural layers are arranged in a staggered manner.

10. The laser plasma cutting machine special for silk screens and thin plates as claimed in any one of claims 1 to 4, wherein the roller shaft (2) is provided with an upper layer and a lower layer, the upper roller shaft (2) is provided with an upper roller shaft pressing wheel (51) above, and the lower roller shaft (2) is provided with a lower roller shaft pressing wheel (52) below.

Technical Field

The invention relates to a cutting machine adopting laser and plasma double cutting heads, in particular to a cutting machine for cutting metal woven meshes, metal sheets, non-metal flexible materials and non-metal plate materials.

Background

The plasma cutting machine on the market is basically not suitable for cutting the metal woven mesh in structure, and the filter screen naturally drops due to no supporting force when cutting is performed, so that the edge of a material in the middle of cutting is tilted due to unstable correction, and normal cutting cannot be performed; secondly, if the cutting is finished, the cut materials are still left on the cutting platform and are not easy to sort and collect. If the cutting is lighter and thinner or the cut product is smaller, the air injection pressure ratio of the cutting nozzle is higher, and the cut material is easy to be blown away and cannot be found.

When the cutting of normal work, because upwards stick up or the downwarping that mesh grid and flexible material unevenness caused, cause the material to run out from the gap of roller and roller like this and cause the unable cutting of material distortion. The existing cutting machine can be provided with the row shaft carrier roller and the row shaft blocking piece between the roller shafts, is unstable in use effect and can vibrate up and down along with the rising of cutting speed. This can cause material jams to damage the material.

Disclosure of Invention

In view of the above circumstances, in order to solve the problems of the prior art, the present invention provides a laser plasma cutting machine dedicated for a screen and a sheet, so as to achieve stable cutting of the screen and the sheet.

The utility model provides a special laser plasma cutting machine of silk screen and sheet metal, includes the frame, set up a plurality of rollers that are used for carrying the work object in parallel in the frame, the spindle nose of roller sets up intermeshing's drive gear respectively, wherein, sets up synchronous gear box servo motor through the coupling joint respectively on the spindle nose of head end gear and tail end gear in the drive gear combination of intermeshing.

According to the utility model provides a special laser plasma cutting machine of silk screen and sheet metal, still be equipped with synchronous pulley on the spindle nose of head end gear and tail end gear respectively, synchronous pulley passes through the hold-in range and connects.

According to the utility model provides a special laser plasma cutting machine of silk screen and sheet metal, still be equipped with the synchronous tight pulley that rises on two or more than two drive gear shaft heads in the intermeshing drive gear that the spindle nose of roller set up respectively, the synchronous tight pulley that rises with the hold-in range meshing.

According to the special laser plasma cutting machine for silk screens and thin plates, transition transmission gears are further arranged among the transmission gears which are meshed with each other and respectively arranged at the shaft heads of the roll shafts.

According to the utility model provides a special laser plasma cutting machine of silk screen and sheet metal, be equipped with a plurality of jump ring grooves on the roller, be equipped with the extension spring in the jump ring groove.

According to the special laser plasma cutting machine for the silk screen and the thin plate, the clamp spring grooves are arranged on the roll shafts in an aligned mode.

According to the special laser plasma cutting machine for silk screens and thin plates, the surface of the roll shaft is provided with a knurling structure layer.

According to the special laser plasma cutting machine for the silk screen and the thin plate, the surface of the roll shaft is provided with the encapsulation structure layer.

According to the application, the roller comprises a plurality of roller shafts with knurled structure layers and a plurality of roller shafts with rubber coating structure layers, and the plurality of roller shafts with knurled structure layers and the plurality of roller shafts with rubber coating structure layers are arranged in a mutually staggered mode.

According to the utility model provides a special laser plasma cutting machine of silk screen and sheet metal, two-layer about the roller sets up altogether, and the top of upper roller is equipped with pinch roller on the roller, and the below of lower floor's roller is equipped with pinch roller under the roller.

After the technology provided by the invention is adopted, the special laser plasma cutting machine for the silk screen and the thin plate has the following beneficial effects.

1) The gear shaft, the synchronous belt, the synchronous wheel, the servo motor and the driven gear set are utilized to cooperate together to ensure that the synchronous motion reduces the reverse clearance. The corresponding roll shafts are driven to rotate by the butt joint of the shaft couplings, so that the feeding and cutting of materials are realized, and the instability of feeding caused by the unevenness of the materials is limited by reducing the distance between the roll shafts and the tension springs of the roll shafts. Corresponding rollers are arranged above and below the roller shaft and are compressed by the air cylinders, so that friction is increased, and feeding errors are avoided.

Drawings

FIG. 1 is a structural diagram of a laser plasma cutting machine for wire mesh and thin plate according to the present application;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

fig. 4 is a view in the direction C of fig. 1, with parts omitted to show the internal structure.

Detailed Description

Various preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The following description with reference to the accompanying drawings is provided to assist in understanding the exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist understanding, but they are to be construed as merely illustrative. Accordingly, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Also, in order to make the description clearer and simpler, a detailed description of functions and configurations well known in the art will be omitted.

As shown in fig. 1-4, a special laser plasma cutting machine for silk screen and thin plate comprises a frame 1, a plurality of roll shafts 2 for conveying work objects are arranged on the frame 1 side by side, shaft heads of the roll shafts 2 are respectively provided with transmission gears 31 which are meshed with each other, wherein, the shaft heads of a head end gear and a tail end gear in the transmission gear 31 combination which are meshed with each other are respectively provided with a synchronous gear box servo motor 4 through coupling joint.

The head end gear and the tail end gear are respectively provided with a synchronous pulley 41, and the synchronous pulleys 41 are connected through a synchronous belt 42.

Two or more than two transmission gear 31 shaft heads in the transmission gears 31 which are mutually meshed and respectively arranged on the shaft heads of the roll shafts 2 are also provided with synchronous tension wheels 43, and the synchronous tension wheels 43 are meshed with the synchronous belt 42.

Transition transmission gears 32 are further arranged among the transmission gears 31 which are arranged on the shaft heads of the roll shafts 2 and meshed with each other respectively and between the transmission gears 31.

A plurality of clamp spring grooves 20 are formed in the roll shaft 2, and tension springs 21 are arranged in the clamp spring grooves 20.

The snap spring grooves 20 are aligned on the respective roller shafts 2.

And a knurled structure layer is arranged on the surface of the roller shaft 2.

And a rubber coating structure layer is arranged on the surface of the roll shaft 2.

The roller 2 includes a plurality of roller 2 that are equipped with the annular knurl structural layer and a plurality of roller 2 that are equipped with the rubber coating structural layer, a plurality of roller 2 that are equipped with the annular knurl structural layer and a plurality of roller 2 that are equipped with the rubber coating structural layer crisscross the setting each other.

The roll shaft 2 is provided with an upper layer and a lower layer, a roll shaft upper pressing wheel 51 is arranged above the upper layer roll shaft 2, and a roll shaft lower pressing wheel 52 is arranged below the lower layer roll shaft 2.

According to the special laser plasma cutting machine for silk screen and thin plate, the cut materials can be automatically discharged, automatically collected, automatically arranged conveniently and quickly, and the personal safety of operators is guaranteed. The discharge port can be provided with a visual detection function, the shape and the size of a cutting material can be detected in real time, products which are out of tolerance and unqualified are detected, the sorting system is automatically removed, and a support is provided for automatic classification and sorting. And a laser marking machine is arranged on the periphery of the outlet, and two-dimensional codes, specification models and the like are printed on the surface of the cut material in real time, so that the possibility is provided for the future quality tracing. The mechanical arms for automatic classification can automatically classify and arrange the waste products according to different shapes, sizes, shapes and the like, and convenience is provided for automatic classification and packaging of the next link.

According to the special laser plasma cutting machine for silk screens and thin plates, the gear shaft, the synchronous belt, the synchronous wheel, the servo motor and the driven gear set are utilized to cooperate together to ensure that the synchronous movement reduces the reverse clearance. The corresponding roll shafts are driven to rotate by the butt joint of the shaft couplings, so that the feeding and cutting of materials are realized, and the instability of feeding caused by the unevenness of the materials is limited by reducing the distance between the roll shafts and the tension springs of the roll shafts. Corresponding rollers are arranged above and below the roller shaft and are compressed by the air cylinders, so that friction is increased, and feeding errors are avoided. The machine itself comprises left and right sides two parts, conveniently removes and removes to realize adjusting the cutting clearance, guarantees that the roller is not cut by the plasma arc mistake, and the machine has newly increased the laser cutting function, can cut non-metallic material like this. The parallel roll shafts are divided into an upper part and a lower part, and the upper part can be lifted by a cylinder to facilitate material returning. The discharge gate top has visual detection, can detect material specification and shape size and discernment waste product, and the laser marking machine is automatic after detecting qualified prints two-dimensional code and specification model on the good product of cutting and provides the traceability in later stage and tracks, sends into automatic packing machine automatic packing through manipulator classification afterwards.

According to the special laser plasma cutting machine for the silk screen and the thin plate, the distance between the roll shafts is reduced to 3MM, and then the tension springs are installed in the clamp spring grooves uniformly distributed in the fixed intervals of the upper roll shaft and the lower roll shaft in parallel. In the upper and lower parallel roll shaft clamp spring grooves, a plurality of rows of springs which can shrink and rotate along with the roll shaft are arranged, so that the defect that feeding is difficult and smooth cutting cannot be realized due to uneven material correction can be overcome.

In order to ensure the accuracy of the motion of the parallel roll shafts, a special synchronous gear box is developed, the layout and the installation mode of gears are optimized, and special materials are customized, numerical control gear grinding is adopted, and the outer diameter is ground. The transmission precision of the gear shaft is ensured. The synchronous gears and the synchronous belts are additionally arranged at the head and the tail of the gear shaft, so that the rotation angle of each gear shaft is constantly guaranteed to be unchanged no matter the gear shaft is positively transmitted or reversely rotated, and the reverse clearance is further eliminated. Therefore, the problem of inaccurate cutting size caused by poor synchronization performance of the previous generation of machines is fundamentally solved.

According to the layout of gear box gear shafts, a transition transmission pinion is arranged in the middle of each gear shaft, bearings with different diameters are arranged at two ends of each transition gear shaft for tight meshing of the transition gear and the gear shaft, the large bearings ensure normal meshing of the gear shafts, small bearings inside the transition gear shafts are tightly pressed by gear top plates at two ends of each transition gear shaft, and a spring device is arranged in the middle of each gear top plate for soft compression joint, so that the problem of inflexible rotation can be effectively solved. The gear box is additionally provided with a second measure, and two servo motors are respectively installed from the head to the tail of the gear shaft by using couplers, so that the accuracy and the synchronism of the movement are ensured constantly when the roller rotates forwards and backwards and reverses.

According to the layout condition of the prior roller shafts, when the upper and lower roller shafts roll in a feeding mode, due to the fact that the thickness relation of materials can cause the meshing distance between the driven gear sets of the upper and lower roller shafts to be increased, the transmission synchronization performance is poor, a set of corresponding driven gear sets of each pair of upper and lower roller shafts after improvement correspond to each other, and replacement and maintenance in the later period are more convenient. The meshing clearance of each set of driven gear set is not influenced by feeding thickness, and each set of driven gear set is installed on the synchronous gear set fixing plate, so that the shaking is prevented, the transmission precision is improved, and the motion synchronism of feeding can be guaranteed constantly.

Previous generation machines often have plasma arcs mistakenly cut the roll axis because the gap cannot be adjusted at the cutting head gap. According to the defects, the whole machine body is divided into a left part and a right part, one part is connected with the machine body support in a hard mode, the other part is connected with the machine body support through the linear bearing, the left part and the right part can be easily and conveniently moved, the cutting gap can be conveniently adjusted, and the plasma arc mistaken cutting of the roll shaft can be prevented. And secondly, the cutting gap can be properly adjusted according to the bending degree of the cutting material, so that the flexible material can be effectively improved, and the cutting can be smoothly realized.

Because the cutting head and the material cut need 2-3MM distance cutting, the diameter of upper and lower roller axle is too big, causes two roller axle cutting clearances too big, so according to the not enough of previous generation, two roller axles on the adjacent higher authority of cutting head reduce the diameter, just so further reduce the cutting gap between two roller axles, can make the material cut easily pass through, cut smoothly.

The former generation machine is too big and the surface is smooth because the driving roll shaft adopts sharp optical axis draw ratio, causes transmission precision and synchronism to receive the influence and has caused the error of cutting size, in view of above disadvantage, this time adopted the roll shaft surface knurling to handle, combine with the rubber covered roller axle, can increase the frictional force of feeding and prevent the cutting error that the material skidded and cause, reuse cylinder exerts certain pressure from top to bottom at the roller pinch roller in a row, the pay-off roller all is located in real time tight laminating by the material of cutting under the operating mode of big frictional force. The pressure wheel is additionally provided with the pressure plate at the position of the parallel shaft pressure wheels, so that the pressure wheels can be prevented from deflecting in the same direction. The length of the supporting rod of the upper row of air cylinders can be adjusted, and the two ends of the supporting rod are connected with the corresponding roll shaft supporting plates. The lower row cylinder supporting rod is connected to the machine body support. Therefore, the phenomenon that the cut material is inaccurate in feeding and the feeding size is not wrong due to the fact that the friction force is too small can be avoided, and the phenomenon that the feeding is not accurate and the cutting size is not accurate can be fundamentally avoided.

The former generation of machine only has one plasma cutting head, can only carry out rough cutting to metal material, and the cutting surface quality is slightly coarse, can not satisfy the cutting task that requires strict to the cutting quality. The back of same slip table has newly increased a laser cutting head now, has had the cutting precision of laser cutting machine like this and to the cutting ability of non-metallic material (polyamide fibre net, dacron net, plastics window screening, PVC board, non-woven fabrics and organic glass etc.), has expanded the scope that this machine can cut the material, can satisfy the quality requirement of meticulous cutting.

The difference of cutting head mounting means, the cutting head mounting means of the previous generation is loaded down with trivial details, and it is inconvenient to change plasma cutting nozzle, has all optimized from mounting means and structure composition now. In the past, the cutting head is closer to the roller shaft, so that the upper side roller shafts in parallel need to be lifted upwards horizontally during material changing, and the cutting nozzle is damaged. At present, the cutting head is naturally fixed downwards in the sliding sleeve by the tension spring, when the upper row of rollers is lifted upwards axially, the cutting head can automatically move upwards due to the cooperation of the tension spring and the sliding sleeve, and the cutting head can automatically reset under the driving of the tension spring when the roller shaft returns to avoid the cutting head from being damaged by external force.

The cutting torch is changed the last generation machine and need be pulled down the operation of whole cutting torch and waste time and energy inefficiency, improves now and makes for cutting torch external diameter and sliding sleeve retaining ring that screw fastening for sliding fit is on the sliding sleeve retaining ring, changes the cutting torch like this and only need loosen the screw, and the cutting torch will easily mention, convenient change cutting torch.

The roller shaft supporting plate is integrated with a machine body through linear cutting machining, and transmission precision is reduced due to the fact that the structure is too simple and the fit clearance is too large. The roll shaft or the bearing is replaced in the later stage, and the whole machine body needs to be disassembled, so that the workload is huge. The improvement of the existing money is numerical control CNC integrated forming processing, and the structure is reasonable and matched closely. The upper and lower roll shafts and the bearing are very convenient to replace in the later period. The horizontal movement of the upper row of roller shafts is driven by double cylinders arranged on the supporting plate, the left and right cylinders are uniformly distributed, and the stress is more stable in operation.

Two cutting head tops are equipped with corresponding surveillance camera heads, can real time monitoring like this observe the cutting torch life-span, the cutting quality to and the behavior of cutting, play the effect of prevention cutting trouble in advance.

The cutting torch is correspondingly provided with the laser positioning cursors, and the cursor points are positioned under the cutting torch, so that the cutting positioning can be more conveniently and visually carried out.

A cutting slag collecting device and a smoke dust processing device are arranged below the cutting gap. The newly improved smoke exhaust device can timely absorb and filter the smoke dust generated during cutting, reduce the discharge amount of harmful gas and smoke dust and reach the environmental protection standard.

With the above improvement, the following problems are solved.

1: inaccurate cut size 2: the synchronous motion performance of the gear is poor, and the reverse clearance is large. 3 plasma arc can produce the skew along with the cutting material motion when cutting nozzle work, can cut the roller by mistake like this, can cause the roller surface hollow uneven, and is crooked even, can cause the surface to damage to the material of carrying like this. 4: the cutting nozzle is difficult to replace, and the mounting and dismounting process is complicated. 5: newly increased laser location cursor point, solved cutting initial point location difficulty, inaccurate problem. 6: the novel laser cutting and plasma cutting functions are added, the requirement on the precision of a cutting surface is met, and meanwhile, the non-metal material can be cut. Can meet the cutting requirements of different customers. 7: the cutting gap can be adjusted at will along with the difference of cutting the material, avoids the burning torch mistake cutting roller. 8: a newly designed cutting slag collecting, smoke discharging and purifying device is arranged right below the cutting gap. 9: the camera is installed in cutting head mounting panel below and other places that are fit for observing, can monitor the operating condition of machine and the consumption condition of cutting nozzle at any time to change in advance. 10: knurling and rubber coating processing are carried out on the surface of the feeding roller shaft, so that slipping of materials and damage to the surface of softer materials can be avoided, and cutting precision is improved. 11: the gap between the parallel roller shafts is reduced, and the tension springs arranged in the groove and provided with a plurality of equidistant clamp spring grooves on the roller shafts can rotate along with the roller shafts. The material is prevented from bending and running out of the roll shaft, so that the feeding difficulty caused by unsatisfactory material bending and leveling can be solved. 12: the roller supporting frame is structurally improved, and the problem that a roller shaft and a bearing are difficult to replace is solved. 13: newly increased the row's axle pressure wheel and compressed tightly the frictional force that has increased roller and material with the cylinder, solved the inaccurate problem of roller pay-off cutting that skids. The pressure wheel is additionally provided with the pressure plate at the position of the parallel shaft pressure wheels, so that the pressure wheels can be prevented from deflecting in the same direction. 14: the gear box is newly added, and the improvement is made from the above points in order to solve the problems of poor motion synchronization performance and large reverse clearance. Gear shaft gear grinding customization production guarantees the transmission precision of each tooth. The transmission shaft in the middle of the gear is in soft compression joint by using a spring and a top plate pressing block structure to ensure the motion synchronism. The gear shafts are respectively provided with a synchronous gear at the head and the tail to be connected with a synchronous belt, so that the gear shafts are tightly meshed to eliminate reverse gaps in real time. The gear shafts are respectively connected with a servo motor by couplers at the head and the tail, so that the synchronism of real-time motion can be further ensured, and the reverse clearance is further eliminated. 15: the mounting position and the mounting mode of the roller shaft connecting plate pressing air cylinder are changed, and the stability and the pressing effect of the machine are improved. 16: an independent upper roller shaft gear set and an independent lower roller shaft gear set are additionally arranged, so that the influence of the feeding thickness on the normal meshing of the gear sets can be avoided, and the synchronization precision can be ensured in real time. The gear set is uniformly installed on the gear set installation plate to prevent the whole body from shaking, and the transmission precision is further improved.

With the above improvement, the following advantageous effects are achieved.

1: the gear box is additionally arranged, so that the cutting precision is improved. 2: the double cutting head increases the cutting capacity for non-metallic materials. 3: and automatically classifying and finishing the cut materials. 3: the quality of the cut material can be traced. 4: automated visual inspection can automatically detect unacceptable products. 5: can effectively collect the cut slag and purify the smoke dust. 6: the cutting gap is convenient to adjust. 7: a roller shaft cylinder pinch roller is added. 8: the probability of manual operation intervention is reduced, the safety of manual operation is improved, the yield is increased, a die does not need to be developed, the production cost is reduced, and the production speed is increased.

The present invention has been described in detail, and the principle and embodiments of the present invention are explained herein by using specific examples, which are only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

From the above description of the embodiments, it will be apparent to those skilled in the art that the present invention may be practiced. Of course, the above listed cases are only examples, and the present invention is not limited thereto. It should be understood by those skilled in the art that other modifications or simplifications according to the technical solution of the present invention may be appropriately applied to the present invention and should be included in the scope of the present invention.