Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a building board surface spraying device with a cleaning effect, which can be used for neatly placing building boards with different widths and conveying the boards to move through an arranged conveying adjusting mechanism, can be used for sequentially carrying out cleaning, dust removal, accurate spraying and efficient drying treatment on the surfaces of the boards in the moving process of the boards, improves the spraying effect and the working efficiency, is convenient for cleaning and spraying the surfaces of the building boards, prevents incomplete spraying or paint waste, can adjust the boards with different widths to convey the boards neatly, and has the characteristics of good spraying effect and high drying efficiency.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a building board surface coating device with clearance effect, includes the frame, the frame top is connected with protective housing, conveying guiding mechanism is installed at the frame top, just conveying guiding mechanism runs through in the protective housing both sides, protective housing is inside to be equipped with surface cleaning mechanism, accurate spraying mechanism and high-efficient stoving mechanism in proper order.
Preferably, the conveying adjusting mechanism comprises a conveying motor, a conveying roller, a fixed guide plate and an adjusting assembly, the conveying motor is mounted on one side of the rack, the conveying roller is connected to the inner side of the top of the rack in a rotating mode at equal intervals, the output end of the conveying motor is in transmission connection with the end portion of the conveying roller through a chain, the fixed guide plate and the adjusting assembly are symmetrically connected to two sides of the top of the rack, and the fixed guide plate and the adjusting assembly are close to the top of the conveying roller.
The adjusting component comprises an electric push rod, a support plate, slide rods, a first buffer spring and a push plate, the electric push rod is arranged on one side, far away from a fixed guide plate, of the rack, the push rod of the electric push rod penetrates through the side face of the rack and then is connected with the support plate, the two slide rods are symmetrically connected to two ends of the support plate and penetrate through the side face of the rack in a sliding manner, the side face of the support plate is uniformly connected with the first buffer spring, the end part of the first buffer spring is connected with the push plate, and the push plate and the fixed guide plate are arranged at two ends of a conveying roller in parallel.
The surface cleaning mechanism preferably comprises a first air cylinder, a buffer assembly, a dust suction box, a dust suction pipe, a guide compression roller, a cleaning motor and a dust collector, wherein the first air cylinder is vertically connected to one side of the top of a protective shell, a piston rod end of the first air cylinder penetrates through the protective shell and is connected with the dust suction box through the buffer assembly, the top of an inner cavity of the dust suction box is connected with the dust suction pipe, a strip-shaped dust suction opening is formed in the bottom of the dust suction pipe, the guide compression roller and the cleaning roller are respectively and rotatably connected to two sides of the bottom of the inner cavity of the dust suction box, the cleaning motor is installed on one side of the top of the dust suction box, an output shaft end of the cleaning motor is in transmission connection with one end of the cleaning roller through a belt, the dust collector is connected to one side of a machine frame through a support, and an air inlet of the dust collector is communicated to the top of the dust suction pipe through the guide pipe, and the dust guide pipe sequentially and movably penetrates through the protective shell and the top of the dust collection box.
Preferably, the buffer assembly comprises a pressing plate, a guide rod, a second buffer spring and a fastening nut, the center of the top of the pressing plate is connected to the end of a piston rod of a first air cylinder, the guide rod penetrates through two ends of the pressing plate in a sliding mode and is fixedly connected to two sides of the top of a dust collection box, the second buffer spring is sleeved on the outer side of the guide rod and is connected between the dust collection box and the pressing plate, the fastening nut is connected to the top end of the guide rod in a threaded mode, and the fastening nut is tightly pressed on the top of the pressing plate.
Preferably, the building board surface spraying device with the cleaning function of the invention, the accurate spraying mechanism comprises a second cylinder, an adjusting box, two spraying frames and a spraying nozzle, the second cylinder is vertically connected with the top of the protective shell, the piston rod end of the second cylinder penetrates through the protective shell and is connected with an adjusting box, a stepping motor is arranged on one side of the top of the adjusting box, transmission screw rods are rotatably connected on two sides of the inside of the adjusting box, and the output shaft end of the stepping motor is in transmission connection with one end of a transmission screw rod through a belt, the outer side of the transmission screw rod is in threaded connection with a slide block, the slide block is in penetrating sliding connection with the bottom of the adjusting box, one of the spraying frames is connected to the bottom of the sliding block, the other spraying frame is fixedly connected to one side of the bottom of the regulating box, and the spraying frame is positioned on the extension surface of the fixed guide plate, and the spraying nozzle is connected to the bottom of the inner side of the spraying frame.
Preferably, the building board surface spraying device with the cleaning function further comprises a coating box, a feeding pipe, a stirring assembly, a booster pump and a material guide pipe, wherein the coating box is connected to one side of the rack through a support, the feeding pipe is communicated with one side of the top of the coating box, the stirring assembly comprises a stirring motor and a spiral stirring blade, the stirring motor is vertically arranged in the center of the top of the coating box, the top end of the spiral stirring blade is meshed and connected to the output shaft end of the stirring motor, the spiral stirring blade is rotatably connected to the inside of the coating box, a liquid inlet of the booster pump is connected to one side of the bottom of the coating box through a pipeline, a liquid outlet of the booster pump is communicated with a spraying nozzle through the material guide pipe, and the material guide pipe movably penetrates through the top of the protective shell.
Preferably, the high-efficiency drying mechanism comprises an air inlet pipe, a fan, a buffer tank, a spoiler, a drying cover and a heating pipe, the buffer tank is connected to the top of an inner cavity of the protective shell, the air inlet pipe penetrates through the top of the protective shell and is communicated with the buffer tank, the fan is installed inside the air inlet pipe, the spoilers are uniformly connected inside the buffer tank, air outlet holes are uniformly distributed in the surfaces of the spoilers, the bottom of the buffer tank is of an open structure, the drying cover is connected to the edge of the bottom of the buffer tank, and the heating pipe is uniformly connected inside the drying cover.
Preferably, the top of the inner side of the air inlet pipe is provided with a filtering component, the filtering component comprises a dustproof grille and a filtering net, the dustproof grille is connected to the top end of the inner side of the air inlet pipe, the filtering net covers the bottom of the dustproof grille, and the filtering net is connected to the inner side of the air inlet pipe.
Preferably, the spraying frame is in an L-shaped plate shape, and a shielding plate is arranged on the side surface of the spraying frame.
Compared with the prior art, the invention has the beneficial effects that:
1. through the arranged conveying adjusting mechanism, when the building board is conveyed, the conveying motor is started to drive the conveying roller to rotate, the board is placed on the conveying roller to be conveyed, then the supporting plate is pushed to move through the electric push rod in the adjusting assembly, the board is pushed to move by the push plate, the board is attached to the inner side of the fixed guide plate, the board is placed neatly along the fixed guide plate, the building boards with different widths can be placed neatly, the board is conveyed to move, and the subsequent cleaning, spraying and drying work on the surface of the board is facilitated;
2. through the arranged surface cleaning mechanism, when a building board moves below the dust collection box, the first air cylinder is started to push the dust collection box to move downwards, so that the guide compression roller and the cleaning roller are pressed on the surface of the board, then the cleaning motor and the dust collector are started, the cleaning roller is used for cleaning dust on the surface of the board into the dust collection box, the dust is sucked into the dust collector through the dust collection pipe, the board can be guided to stably move through the arranged guide compression roller, the cleaning brush can clean conveniently, the guide compression roller and the cleaning roller can be well pressed on the surface of the board through the arranged buffer assembly, the surface of the board is prevented from being crushed and scratched, and the overall cleaning effect of the surface of the board is improved;
3. through the arranged accurate spraying mechanism, when the cleaned building board moves below the spraying frame, the second cylinder is started to push the adjusting box to move downwards, so that the spraying frame is close to the surface of the board, then according to the width of the plate, through an adjusting structure in the adjusting box, a stepping motor is started to drive a transmission screw rod to rotate, so that a sliding block moves along the bottom of the adjusting box, because one of the spraying frames is connected with the bottom of the slide block, the distance between the two spraying frames can be adjusted, so that the spraying frames just cover the surface of the plate, then the booster pump is started to spray the coating in the coating box out of the spraying nozzle through the material guide pipe, so that the surface of the plate can be accurately sprayed, incomplete spraying or coating waste can be prevented, the stirring component can stir the paint in the paint box, so that the paint is uniformly mixed, and the spraying effect is favorably improved;
4. through the arranged efficient drying mechanism, when the sprayed building board moves below the drying cover, the fan and the heating pipe are started, so that the outside air is sequentially exhausted into the drying cover through the air inlet pipe, the filtering component, the buffer box and the spoiler for heating, the introduced cold air can be filtered, buffered and decelerated, the hot air exhausted from the drying cover is soft and stable, then the surface of the sprayed board is dried through the heat of the heating pipe and the hot air exhausted from the drying cover, the situation that the spraying surface of the board is corrugated and blown to be scratched due to high wind speed is prevented, and the drying effect and efficiency are effectively improved;
5. according to the invention, the building boards with different widths can be placed in order and conveyed to move through the arranged conveying and adjusting mechanism, and the processing work of cleaning, dust removal, accurate spraying and efficient drying can be sequentially carried out on the surfaces of the boards in the moving process of the boards, so that the automation degree of the spraying on the surfaces of the boards is improved, and the spraying effect and the working efficiency are improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1-10;
the utility model provides a building board surface spraying device with clearance effect, which comprises a frame 1, 1 top in the frame is connected with protective housing 11, conveying guiding mechanism 2 is installed at 1 top in the frame, and conveying guiding mechanism 2 runs through in protective housing 11 both sides, protective housing 11 is inside to be equipped with surface cleaning mechanism 3 in proper order, accurate spraying mechanism 4 and high-efficient stoving mechanism 5, wherein, conveying guiding mechanism 2 is used for putting the building board of different width neatly and conveying board removes, surface cleaning mechanism 3 is used for cleaning the dust removal to the panel surface, then carry out accurate spraying through accurate spraying mechanism 4 to the clean up panel surface and handle, dry through high-efficient stoving mechanism 5 the spraying face of the good building board of spraying at last.
It should be noted that: in this embodiment, a control box is arranged on one side of the rack 1, a PLC controller is arranged in the control box, and an operation panel is arranged on the top of the control box, the control box is powered by an external power supply, the conveying motor 21, the electric push rod 241, the first cylinder 31, the cleaning motor 37, the dust collector 38, the second cylinder 41, the stepping motor 421, the stirring motor 471, the fan 52 and the heating pipe 56 are respectively electrically connected with the PLC controller, and the operation panel is electrically connected with the PLC controller, so that the control through the operation panel is facilitated.
In this embodiment: when the building board is sprayed, firstly, the board is placed on the conveying roller 22, when the building board is conveyed, the conveying motor 21 is started to drive the conveying roller 22 to rotate, then the electric push rod 241 in the adjusting assembly 24 pushes the supporting plate 242 to move, so that the push plate 245 pushes the board to move, the board is attached to the inner side of the fixed guide plate 23, the board is placed neatly along the fixed guide plate 23, the building boards with different widths can be placed neatly and the board is conveyed to move, the subsequent cleaning, spraying and drying work on the surface of the board is facilitated, when the building board moves below the dust collection box 33, the first air cylinder 31 is started to push the dust collection box 33 to move downwards, so that the guide press roller 35 and the cleaning roller 36 are pressed on the surface of the board, then the cleaning motor 37 and the dust collector 38 are started, so that the cleaning roller 36 cleans the dust on the surface of the board into the dust collection box 33, dust is sucked into a dust collector 38 through a dust suction pipe 34, the plate can be guided to move stably through the arranged guide press roll 35, the cleaning brush is convenient to clean, the guide press roll 35 and the cleaning roll 36 can be well pressed on the surface of the plate through the arranged buffer assembly 32, the surface of the plate is prevented from being pressed and scratched, the overall cleaning effect of the surface of the plate is improved, when the cleaned building plate moves below the spraying frame 43, the second air cylinder 41 is started to push the adjusting box 42 to move downwards, the spraying frame 43 is close to the surface of the plate, then the stepping motor 421 is started to drive the transmission screw rod 422 to rotate through an adjusting structure in the adjusting box 42 according to the width of the plate, the sliding block 423 is enabled to move along the bottom of the adjusting box 42, and because one spraying frame 43 is connected to the bottom of the sliding block 423, the distance between the two spraying frames 43 can be adjusted, so that the spraying frame 43 just covers the surface of the plate, then the booster pump 48 is started to spray the coating in the coating box 45 out of the spraying nozzle 44 through the material guide tube 481, so as to accurately spray the surface of the plate, prevent incomplete spraying or waste of the coating, and stir the coating in the coating box 45 through the arranged stirring component 47, so that the coating is uniformly mixed, which is beneficial to improving the spraying effect, when the sprayed building plate moves to the lower part of the drying cover 55, the fan 52 and the heating tube 56 are started, so that the outside air is discharged into the drying cover 55 through the air inlet tube 51, the filtering component 57, the buffer box 53 and the spoiler 54 in sequence to be heated, so as to filter, buffer and reduce the introduced cold air, so that the hot air discharged from the drying cover 55 is soft and stable, and then the surface of the sprayed plate is dried through the heat of the heating tube 56 and the hot air discharged from the drying cover 55, the spraying surface of the plate is prevented from being corrugated and blown with marks due to high wind speed, and the drying effect and efficiency are effectively improved.
Based on the existing building board surface spraying device, the building boards with different widths can be placed in order and conveyed to move through the conveying and adjusting mechanism 2, and in the process of moving the boards, the processing work of cleaning, dedusting, accurate spraying and efficient drying can be sequentially carried out on the surfaces of the boards through the surface cleaning mechanism 3, the accurate spraying mechanism 4 and the efficient drying mechanism 5, so that the automation degree of spraying the surfaces of the boards is improved, and the spraying effect and the working efficiency are improved.
As shown in fig. 1 and 2;
combine above-mentioned content, conveying guiding mechanism 2 includes conveying motor 21, transfer roller 22, fixed deflector 23 and adjusting part 24, conveying motor 21 installs in frame 1 one side, transfer roller 22 rotates at equal intervals and connects at 1 top inboardly, and conveying motor 21's output passes through the chain and is connected with transfer roller 22 end transmission, fixed deflector 23 and adjusting part 24 symmetric connection are in 1 top both sides of frame, and fixed deflector 23 is close to at transfer roller 22 top with adjusting part 24, adopt this design, be convenient for put the building board of different width neatly and convey the panel removal on transfer roller 22.
Further, the method comprises the following steps: the adjusting assembly 24 includes an electric push rod 241, a supporting plate 242, sliding rods 243, first buffer springs 244 and a push plate 245, the electric push rod 241 is installed on one side of the rack 1 far away from the fixed guide plate 23, the push rod of the electric push rod 241 penetrates through the side of the rack 1 and then is connected with the supporting plate 242, the two sliding rods 243 are symmetrically connected to two ends of the supporting plate 242, the sliding rods 243 penetrate through the side of the rack 1, the side of the supporting plate 242 is evenly connected with the first buffer springs 244, the end of the first buffer springs 244 is connected with the push plate 245, the push plate 245 and the fixed guide plate 23 are arranged at two ends of the conveying roller 22 in parallel, the supporting plate 242 is pushed by the electric push rod 241 to move, the push plate 245 pushes the plate to move, due to the effect of the first buffer springs 244, the plate can be well attached to the inner side of the fixed guide plate 23, and the plate can be placed neatly along the fixed guide plate 23.
In this embodiment: when conveying building board, start conveying motor 21 and drive transfer roller 22 and rotate, place panel and carry out the conveying on transfer roller 22, then promote backup pad 242 through electric putter 241 among adjusting part 24 and remove, make push pedal 245 promote panel and remove, make panel attached at fixed deflector 23 inboard, make panel put neatly along fixed deflector 23, can put the building board of different width neatly and convey panel and remove, be convenient for follow-up clear up the panel surface, spraying and stoving work.
As shown in fig. 1, 2, 3 and 4;
in combination with the above, the surface cleaning mechanism 3 includes a first cylinder 31, a buffer assembly 32, a dust collection box 33, a dust collection pipe 34, a guiding pressure roller 35, a cleaning roller 36, a cleaning motor 37 and a dust collector 38, the first cylinder 31 is vertically connected to one side of the top of the protective housing 11, a piston rod end of the first cylinder 31 penetrates through the protective housing 11 and is connected to the dust collection box 33 through the buffer assembly 32, the top of the inner cavity of the dust collection box 33 is connected to the dust collection pipe 34, a strip-shaped dust collection opening 341 is formed at the bottom of the dust collection pipe 34, the guiding pressure roller 35 and the cleaning roller 36 are respectively rotatably connected to two sides of the bottom of the inner cavity of the dust collection box 33, the cleaning motor 37 is installed at one side of the top of the dust collection box 33, an output shaft end of the cleaning motor 37 is connected to one end of the cleaning roller 36 through a belt, the dust collector 38 is connected to one side of the frame 1 through a support, an air inlet of the dust collector 38 is communicated to the top of the dust collection pipe 34 through the dust collection pipe 381, and the dust guide pipe 381 sequentially and movably penetrates through the top of the protective shell 11 and the top of the dust suction box 33, and by adopting the design, the surface of the building board can be cleaned and dedusted conveniently in the moving process of the building board.
Further, the method comprises the following steps: the buffer assembly 32 includes a pressing plate 321, a guide rod 322, a second buffer spring 323 and a fastening nut 324, the center of the top of the pressing plate 321 is connected to the piston rod end of the first cylinder 31, the guide rod 322 slidably penetrates through two ends of the pressing plate 321, and the guide rod 322 is fixedly connected to two sides of the top of the dust box 33, the second buffer spring 323 is sleeved outside the guide rod 322, and the second buffer spring 323 is connected between the dust box 33 and the pressing plate 321, the fastening nut 324 is screwed on the top end of the guide rod 322, and the fastening nut 324 is tightly pressed on the top of the pressing plate 321, when the pressing plate 321 moves downward, the dust box 33 moves downward, when the guide press roll 35 and the cleaning roll 36 are pressed on the surface of the plate, due to the buffering effect of the second buffer spring 323, the pressing and scratching of the surface of the plate can be prevented, and a good protection effect is achieved.
In this embodiment: when building board moved to dust suction box 33 below, start first cylinder 31 and promote dust suction box 33 and move down, make direction compression roller 35 and clean roller 36 cover on the panel surface, then start and clean motor 37 and dust catcher 38, make clean roller 36 clean the dust on panel surface in dust suction box 33, inhale the dust in dust catcher 38 through dust absorption pipe 34, through the direction compression roller 35 that sets up, can lead panel steady movement, be convenient for the cleaning brush cleans, through the buffer assembly 32 that sets up, make direction compression roller 35 cover can be good with clean roller 36 cover on the panel surface, prevent to cause the crushing to the panel surface, the scratch, the holistic clearance effect in panel surface has been improved.
As shown in fig. 1, 2, 5, 6 and 7;
in combination with the above, the precise spraying mechanism 4 includes a second cylinder 41, an adjusting box 42, two spraying frames 43 and a spraying nozzle 44, the second cylinder 41 is vertically connected to the top of the protective housing 11, the piston rod end of the second cylinder 41 penetrates through the protective housing 11 and is connected to the adjusting box 42, a step motor 421 is installed on one side of the top of the adjusting box 42, two sides inside the adjusting box 42 are rotatably connected to a transmission screw 422, an output shaft end of the step motor 421 is connected to one end of the transmission screw 422 through a belt, a sliding block 423 is screwed on the outer side of the transmission screw 422, the sliding block 423 penetrates through and is connected to the bottom of the adjusting box 42, one of the spraying frames 43 is connected to the bottom of the sliding block 423, the other spraying frame 43 is fixedly connected to one side of the bottom of the adjusting box 42, the spraying frame 43 is located on the extending surface of the fixed guide plate 23, and the spraying nozzle 44 is connected to the bottom of the inner side of the spraying frame 43.
Further, the method comprises the following steps: accurate spraying mechanism 4 is still including scribbling the workbin 45, the filling tube 46, stirring subassembly 47, booster pump 48 and passage 481, scribble workbin 45 and pass through the leg joint in frame 1 one side, it has filling tube 46 to scribble workbin 45 top one side intercommunication, stirring subassembly 47 includes agitator motor 471 and spiral stirring leaf 472, agitator motor 471 installs perpendicularly at scribbling workbin 45 top central authorities, spiral stirring leaf 472 top meshing is connected at the output axle head of agitator motor 471, and spiral stirring leaf 472 rotates to be connected inside scribbling workbin 45, booster pump 48's inlet passes through the pipe connection and scribbles workbin 45 bottom one side, booster pump 48's liquid outlet is linked together with spraying shower nozzle 44 through passage 481, and passage 481 activity runs through in protective housing 11 top, it is convenient reinforced, be convenient for stir the coating in scribbling workbin 45, prevent that the coating from condensing.
In this embodiment: when the cleaned building board moves to the position below the spraying frame 43, the second air cylinder 41 is started to push the adjusting box 42 to move downwards, so that the spraying frame 43 is close to the surface of the board, then, according to the width of the plate, through the adjusting structure inside the adjusting box 42, the stepping motor 421 is started to drive the transmission screw 422 to rotate, so that the slide block 423 moves along the bottom of the adjusting box 42, since one of the painting stands 43 is connected to the bottom of the sliding block 423, the distance between the two painting stands 43 can be adjusted, so that the painting stand 43 just covers the surface of the plate, then, the booster pump 48 is started to spray the coating in the coating tank 45 out of the spraying nozzle 44 through the material guide tube 481, so that the surface of the plate can be accurately sprayed, incomplete spraying or waste of the coating can be prevented, through the stirring subassembly 47 that sets up, can stir the coating in the coating case 45 for coating homogeneous mixing is favorable to promoting the effect of spraying.
It should be noted that: the spraying frame 43 is designed to be L-shaped, the shielding plates 431 are arranged on the side faces of the spraying frame 43, the spraying frame 43 is designed to be L-shaped, the spraying frame 43 can be covered on two sides of the top of the plate, and the spraying of the coating sprayed by the spraying nozzles 44 is prevented from splashing to two sides through the arranged shielding plates 431, so that coating waste is avoided.
As shown in fig. 1, 8, 9 and 10;
combine above-mentioned, high-efficient drying mechanism 5 includes air-supply line 51, fan 52, buffer box 53, spoiler 54, dry cover 55 and heating pipe 56, buffer box 53 is connected at 11 inner chambers tops of protective housing, air-supply line 51 runs through protective housing 11 tops and is linked together with buffer box 53, fan 52 is installed inside air-supply line 51, spoiler 54 evenly connected is inside buffer box 53, and spoiler 54 surface evenly distributed has exhaust vent 541, buffer box 53 bottom is established to open structure, and dry cover 55 and connect at buffer box 53 bottom edge, heating pipe 56 evenly connected is inside drying cover 55, conveniently heat the cold wind in buffer box 53, and carry out hot-blast drying to the good panel surface of spraying.
Further, the following steps: the filtering component 57 is arranged at the top of the inner side of the air inlet pipe 51, the filtering component 57 comprises a dustproof grille 571 and a filtering screen 572, the dustproof grille 571 is connected to the top end of the inner side of the air inlet pipe 51, the filtering screen 572 covers the bottom of the dustproof grille 571, the filtering screen 572 is connected to the inner side of the air inlet pipe 51, dust can be prevented from entering the air inlet pipe 51, entering air can be filtered through the filtering screen 572, a clean air source is provided for hot air drying, and dust can be prevented from being adhered to the surface of a sprayed plate.
In this embodiment: when the well-sprayed building board moves to the lower part of the drying cover 55, the fan 52 and the heating pipe 56 are started, so that the outside air sequentially passes through the air inlet pipe 51, the filtering component 57, the buffer tank 53 and the spoiler 54 to be heated in the drying cover 55, the introduced cold air can be filtered, buffered and decelerated, the hot air discharged from the drying cover 55 is soft and stable, then the surface of the well-sprayed board is dried by the heat of the heating pipe 56 and the hot air discharged from the drying cover 55, the situation that the spraying surface of the board is corrugated and is blown with marks due to large wind speed is prevented, and the drying effect and efficiency are effectively improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.