Disclosure of Invention
The invention provides an environment-friendly garden construction method, which can effectively solve the problems that the cleaning efficiency of construction ground garbage and sundries is poor, the working process is influenced, and meanwhile, the residual garbage and sundries can cause pollution to the surrounding environment in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an environment-friendly garden construction method comprises the following steps:
s1, moving on a construction site through a vehicle frame driving device, matching a conveying frame and a guide plate in an automatic picking mechanism, picking and conveying the garbage and sundries on the construction site in the moving process of the vehicle frame, and storing the garbage and the sundries in a centralized manner through a storage box;
s2, according to design standards and landscape requirements, earth is backfilled to a designed elevation, then soil is loosened on the field through a disc harrow in the soil loosening and fertilizing mechanism, and meanwhile, fertilizers in a fertilizer box are uniformly sprayed out through vibration of a screen to fertilize the soil;
s3, after loosening soil and fertilizing, pushing the raised soil through a push plate in the soil pushing and spreading mechanism to ensure the smoothness of the site, and conveniently gathering the soil on the two sides of the frame in the middle of the push plate through a spiral plate in the soil pushing process;
s4, performing fixed-point paying-off work on a construction site according to the requirements of a design drawing, and marking a planting section, a planting position and a planting variety;
s5, cleaning up the garbage and sundries left after construction, ensuring the cleanness of the garden ground, and digging pits according to the marks to plant trees;
s6, selecting proper grass seeds according to design requirements, mixing the grass seeds with fertilizers, and sowing the mixture in a sowing area.
Compared with the prior art, the invention has the beneficial effects that: the invention has scientific and reasonable structure and safe and convenient use:
1. the soil loosening and fertilizing mechanism is arranged, the lead screw is driven to rotate through the rotary disc, the movable plate is driven to move in the groove, meanwhile, the protective cover, the rotating rod and the disc harrow are driven to move through the matching of the rotating plate, the height of the disc harrow is adjusted, the overturning soil loosening depth of a construction site is conveniently adjusted as required, the rotating rod is driven to rotate through the rotating motor, the rotating rod and the disc harrow are driven to rotate through the matching of the driving wheel, the guide wheel and the driving belt, the soil of the construction site is overturned, and the fertility of the soil is improved;
in addition, through the matching of the connecting block and the telescopic rod, the protective cover is prevented from deviating in the moving process, the stability of the protective cover and the disc harrow is ensured, and meanwhile, through the telescopic characteristic of the supporting spring, the movable block is pulled to slide in the embedded groove in the lifting process of the protective cover, the position of the guide wheel is adjusted, the tightness of the driving belt is kept, and the power is conveniently transmitted;
in addition, it is rotatory to drive the cam through the bull stick, thereby promote ejector pin and slide and remove in the unloading passageway is inside, and the cooperation through the arc promotes the screen cloth and rises, then through the flexible characteristic of reset spring, conveniently promote ejector pin and slide and reset, remove the support to the screen cloth, simultaneously under the effect of balancing weight gravity, make the screen cloth reset, make things convenient for the removal of follow-up ejector pin and slide, continuous drive screen cloth vibrates, make the even unrestrained of fertilizer, fill fertilizer to the soil after the upset, the fertility in soil has further been improved, facilitate for the planting in follow-up gardens.
2. The automatic picking mechanism is arranged, the containing box is conveniently arranged at the front end of the frame through the connecting piece, the connection convenience is improved, the matching of the supporting wheels and the rollers is realized, the flexibility of the device is improved, the frame can conveniently push the containing box and the conveying frame to move, the garbage on a construction site is collected, the pollution to the surrounding environment is reduced, meanwhile, in the rotating process of the rollers, the rollers are driven to rotate through the rotating shafts, the power is transmitted through the matching of belts, the transverse rods and the shifting pieces are driven to rotate, the garbage on the construction site can be conveniently shifted onto the conveying belts from the guide plates, the garbage collection efficiency is improved, in addition, the power is further utilized through the matching of transmission gears, the rollers and the rotating shafts drive the rotating drums and the conveying belts to rotate in the rotating process, sundries and the garbage are conveyed and are stored in a centralized mode through the containing box;
in addition, it is rotatory to drive the regulation pole through the knob, it slides along the spout to promote fixture block and baffle, the position of baffle has been adjusted, the laminating degree of baffle and ground is adjusted as required to the convenience, the adaptability of device is improved, guarantee the collection effect to debris and rubbish, simultaneously at the rotatory in-process of supporting wheel, it is rotatory to drive the elliptical axis, promote kicking block and grid vibrations, and the cooperation through vibrations spring and gag lever post, form the subassembly, it resets to drive the grid at the rotatory in-process of elliptical axis, and then make the grid continuously shake in the containing box inside, shake earth in the rubbish down, avoid causing the waste of earth, it is simultaneously convenient follow-up to handle debris and rubbish.
3. The soil spreading mechanism for bulldozing is arranged, soil piles on the site can be conveniently spread in the moving process of the push plate on the frame, the smoothness of the site is guaranteed, subsequent garden construction can be conveniently carried out, meanwhile, the push plate is pushed to move through the electric push rod, the distance between the push plate and the ground is adjusted as required, the adaptability of the device is improved, in the moving process of the push plate, the push plate is limited through the matching of the slide rods, the push plate is prevented from being deviated, the bulldozing effect is guaranteed, in addition, when the device is not used, the screw rod is matched with the rotating plate through rotating the screw rod, the mounting arm is pulled to rotate, the push plate is stored, and the convenience of the device is improved;
in addition, it is rotatory to drive the connecting rod and change the piece through the runner, and it is rotatory to drive first gear through the tooth arch, it is rotatory to make first gear drive second gear, transmit power, it is rotatory to drive swing arm and spiral plate, and at rotatory in-process, through first gear and the cooperation of second gear, it improves the rotational speed to form variable speed subassembly, increase swing arm and spiral plate rotational speed, conveniently drive between the push pedal with the soil of both sides, improve the effect of pushing away the flat to the place, cover fertilizer overturns simultaneously, improve the mixed effect of fertilizer and soil, further increase the fertility in soil, for the planting in follow-up gardens facilitates, in addition through the cooperation of connecting plate and one-way bearing, avoid the spiral plate reversal.
Synthesize, loosen the soil fertilizing mechanism, pick up the mechanism automatically, bulldoze and spread out mechanism and mutually support, the at utmost utilizes power, improves the utilization ratio of resource, reduces and consumes, clears up the construction place simultaneously, has improved the cleanliness factor in place, reduces the polluted environment, improves the convenience of garden construction to the convenience is loosened the soil and is fertilized the place, improves the effect that gardens were planted, increases the efficiency of construction.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example (b): as shown in fig. 1, the invention provides a technical scheme, and an environment-friendly garden construction method comprises the following steps:
s1, the vehicle frame 1 drives the device to move in a construction site, meanwhile, the conveying frame 403 in the automatic picking mechanism 4 is matched with the guide plate 409, and in the moving process of the vehicle frame 1, garbage and sundries on the construction site are picked up, conveyed and stored in a centralized manner through the storage box 401;
s2, according to design standards and landscape requirements, earth is backfilled to a designed elevation, then soil is loosened on the field through the disc harrow 210 in the soil loosening and fertilizing mechanism 2, meanwhile, through the vibration of the screen 221, fertilizer in the fertilizer can 219 is uniformly sprayed out, and the soil is fertilized;
s3, after loosening soil and fertilizing, pushing the raised soil by the push plate 504 in the soil-shifting and spreading mechanism 5 to ensure the smoothness of the field, and in the soil-shifting process, conveniently gathering the soil on two sides of the frame 1 in the middle of the push plate 504 through the spiral plate 516;
s4, performing fixed-point paying-off work on a construction site according to the requirements of a design drawing, and marking a planting section, a planting position and a planting variety;
s5, cleaning up the garbage and sundries left after construction, ensuring the cleanness of the garden ground, and digging pits according to the marks to plant trees;
s6, selecting proper grass seeds according to design requirements, mixing the grass seeds with fertilizers, and sowing the mixture in a sowing area.
As shown in fig. 2-9, a soil loosening and fertilizing mechanism 2 is arranged at the bottom end of the frame 1, and the soil loosening and fertilizing mechanism 2 includes a groove 201, a screw rod 202, a turntable 203, a movable plate 204, a rotating plate 205, a protective cover 206, a connecting block 207, a telescopic rod 208, a rotating rod 209, a disk rake 210, a rotating motor 211, a rotating rod 212, a driving wheel 213, a fixed block 214, a supporting spring 215, a movable block 216, a guide wheel 217, a driving belt 218, a fertilizer box 219, a blanking channel 220, a screen 221, a balancing weight 222, a sliding plate 223, an arc-shaped plate 224, a push rod 225, a return spring 226 and a cam 227;
the bottom end of the frame 1 is provided with a groove 201, the inner wall of the groove 201 is rotatably connected with a screw rod 202, two ends of the screw rod 202 penetrate through two sides of the frame 1, the two ends of the screw rod 202 are respectively cast with a turntable 203 at positions corresponding to the outer side of the frame 1, the positions corresponding to the inner part of the groove 201 at the outer side of the screw rod 202 are symmetrically connected with movable plates 204 through threads, the bottom ends of the two movable plates 204 are respectively rotatably connected with a rotating plate 205, the other end of the rotating plate 205 is hinged with a protective cover 206, the top end of the protective cover 206 is fixedly connected with a connecting block 207 in an equidistant and symmetrical mode, the top end of the connecting block 207 is fixedly connected with an expansion link 208, the top end of the expansion link 208 is fixedly connected with the bottom end of the frame 1, the inner wall of the protective cover 206 is rotatably connected with a rotating rod 209, and a disc rake 210 is fixedly sleeved at the position corresponding to the inner part of the protective cover 206 at the outer side of the rotating rod 209;
the position, corresponding to one side of the protective cover 206, of the bottom end of the frame 1 is fixedly connected with a rotating motor 211 through a mounting plate, output shafts at two ends of the rotating motor 211 are fixedly connected with rotating rods 212, the outer side of each rotating rod 212 and two ends of the protective cover 206 are symmetrically and rotatably connected with a transmission wheel 213, the position, corresponding to one side of the transmission wheel 213, of the bottom end of the frame 1 is fixedly connected with a fixed block 214, one end of the fixed block 214 is fixedly connected with a supporting spring 215, the other end of the supporting spring 215 is fixedly connected with a movable block 216, the bottom end of the movable block 216 is rotatably connected with a guide wheel 217, and the outer sides of the guide wheel 217 and the transmission wheel 213 are sleeved with a transmission belt 218;
a fertilizer box 219 is fixedly connected to one side of the top end of the frame 1, a blanking channel 220 is fixedly connected to the bottom end of the fertilizer box 219 corresponding to one side of the protective cover 206, a screen 221 is movably connected to the inner wall of the blanking channel 220, in order to improve the loosening effect, two ends of the rotating rod 212 penetrate through the protective cover 206 and are fixedly connected to one end of the driving wheel 213, the rotating motor 211 is a double-head motor, the rotating motor 211 is powered by an external power supply, the top end of the movable block 216 is slidably connected to the bottom end of the frame 1, fertilizer is filled in the fertilizer box 219, a balancing weight 222 is fixedly connected to the top end of the screen 221, sliding plates 223 are symmetrically and slidably connected to the inner wall of the blanking channel 220 corresponding to the bottom position of the screen 221, arc plates 224 are fixedly connected to the top end of the sliding plates 223 and the bottom end of the screen 221, a push rod 225 is fixedly connected to one end of the sliding plate 223, in order to push the screen 221 to vibrate, the two arc plates 224 are positioned on the same plane, one end of the push rod 225 penetrates through one end of the blanking channel 220, one end of the push rod 225 is attached to the outer side of the cam 227, a reset spring 226 is sleeved at a position on the outer side of the push rod 225 corresponding to one side of the sliding plate 223, and the cam 227 is fixedly sleeved at a position on the outer side of the rotating rod 212 corresponding to one side of the push rod 225.
One end of the frame 1 is symmetrically and fixedly connected with a connecting piece 3, one end of the frame 1 is fixedly connected with an automatic picking mechanism 4 through the connecting piece 3, and the automatic picking mechanism 4 comprises a containing box 401, a supporting wheel 402, a conveying frame 403, a rotary drum 404, a conveying belt 405, a baffle 406, a sliding chute 407, a clamping block 408, a guide plate 409, an adjusting rod 410, a knob 411, a triangular plate 412, a cross bar 413, a shifting piece 414, an extension plate 415, a rotating shaft 416, a transmission gear 417, a belt 418, a roller 419, an elliptical shaft 420, a grating 421, a top block 422, a bottom plate 423, a limiting rod 424, a vibrating spring 425 and a fixing plate 426;
one end of the frame 1 is fixedly connected with a containing box 401 through a connecting piece 3, the bottom end of the containing box 401 is symmetrically and rotatably connected with supporting wheels 402, an elliptical shaft 420 is fixedly sleeved at a position corresponding to the bottom of the containing box 401 between the two supporting wheels 402, a grid 421 is movably connected inside the containing box 401, a top block 422 is fixedly connected at a position corresponding to the top of the elliptical shaft 421, a bottom plate 423 is symmetrically and equidistantly and fixedly connected at a position corresponding to the bottom of the grid 421 on the inner wall of the containing box 401, a limiting rod 424 is movably connected at the bottom end of the bottom plate 423, a vibration spring 425 is sleeved at a position corresponding to the bottom of the bottom plate 423 outside the limiting rod 424, in order to push the grid 421 to vibrate, the top end of the elliptical shaft 420 is attached to the bottom end of the top block 422, the top end of the limiting rod 424 penetrates through the bottom plate 423 and is fixedly connected with the bottom end of the grid 421, a stop block is cast at the bottom end of the limiting rod 424, and an inclined plane is formed at the top end of the bottom plate 423;
one end of the containing box 401 is symmetrically and fixedly connected with a fixing plate 426, the other end of the fixing plate 426 is fixedly connected with a conveying frame 403, the inner wall of the conveying frame 403 is connected with a rotating drum 404 in an equidistant rotating mode, a conveying belt 405 is sleeved on the outer side of the rotating drum 404, two sides of the top end of the conveying frame 403 are fixedly connected with baffle plates 406, sliding grooves 407 are formed in the inner walls of the two baffle plates 406, clamping blocks 408 are connected in the sliding mode inside the sliding grooves 407, a guide plate 409 is fixedly connected between the two clamping blocks 408 at a position corresponding to the top of the conveying belt 405, an adjusting rod 410 is connected at a position, corresponding to one side of the clamping blocks 408, of the top end of the conveying frame 403 in a rotating mode, and a knob 411 is cast at one end of the adjusting rod 410;
one end of the conveying frame 403 is symmetrically and fixedly connected with triangular plates 412, a cross rod 413 is rotatably connected between the two triangular plates 412, two ends of the cross rod 413 penetrate through one end of the two triangular plates 412, shifting pieces 414 are fixedly connected with the outer side of the cross rod 413 at equal intervals, extension plates 415 are fixedly connected with the bottom end of the conveying frame 403 at the bottom end symmetrically, one end of the extension plate 415 is rotatably connected with a rotating shaft 416, transmission gears 417 are fixedly sleeved at the positions of the outer side of the rotating shaft 416 and the outer side of the rotary drum 404 corresponding to one side of the conveying frame 403, in order to convey garbage conveniently, two ends of the rotary drum 404 penetrate through two ends of the conveying frame 403, anti-slip strips are fixedly connected with the outer side of the conveying belt 405 at equal intervals, one end of the adjusting rod 410 penetrates through one end of the clamping block 408, the outer side of the adjusting rod 410 is connected with the inner wall of the clamping block 408 through threads, the two transmission gears 417 are meshed with each other, and belts 418 are sleeved at the positions of the outer sides of the rotating shaft 416 and the cross rod 413 corresponding to one side of the transmission gears 417, a roller 419 is fixedly connected at one end of the rotating shaft 416 corresponding to one side of the belt 418;
one end of the frame 1 is provided with a dozing and leveling mechanism 5, and the dozing and leveling mechanism 5 comprises a mounting arm 501, a transverse plate 502, a sliding rod 503, a push plate 504, a rotating wheel 506, a positioning plate 505, the rotating wheel 506, a connecting rod 507, a rotating block 508, an embedded groove 509, a tooth projection 510, a first gear 511, a connecting plate 512, a rotating rod 513, a one-way bearing 514, a second gear 515, a spiral plate 516, an electric push rod 517, a convex block 518, a screw 519 and a rotating plate 520;
one end of the frame 1 is symmetrically and rotatably connected with a mounting arm 501, one end of the mounting arm 501 is fixedly connected with a transverse plate 502, the bottom end of the transverse plate 502 is symmetrically and movably connected with a sliding rod 503, the bottom end of the sliding rod 503 is fixedly connected with a push plate 504, the middle position of the top end of the push plate 504 is fixedly connected with an electric push rod 517, one end of the push plate 504 is symmetrically and fixedly connected with a positioning plate 505, a rotating wheel 506 is rotatably connected between the two positioning plates 505, two ends of the two positioning plates 505 are rotatably connected with a connecting rod 507, the other end of the connecting rod 507 is fixedly connected with a rotating block 508, one end of the rotating block 508 is provided with an embedded groove 509, the inner wall of the embedded groove 509 is fixedly connected with a gear protrusion 510 at equal intervals, the inside of the embedded groove 509 is rotatably connected with a first gear 511 at equal intervals, one end of the push plate 504 is symmetrically and fixedly connected with a connecting plate 512, one end of the connecting plate 512 is rotatably connected with a rotating rod 513, and a one-way bearing 514 is sleeved at the outer side of the rotating rod 513 and the inside the connecting plate 512, a second gear 515 is sleeved on the outer side of the rotary rod 513 corresponding to the inner position of the embedded groove 509, in order to increase the rotation speed, one end of the connecting rod 507 penetrates through the positioning plate 505 to be fixedly connected with one end of the rotating wheel 506, the rotating block 508 is meshed with the first gear 511 through the tooth protrusion 510, the first gear 511 is meshed with the second gear 515, one end of the rotating rod 513 is attached to the inner wall of the embedded groove 509, the outer side of the first gear 511 is rotatably connected with a fixed ring through a rotating shaft, the fixed ring is fixedly connected with one end of the push plate 504, a spiral plate 516 is fixedly connected between the outer side of the rotary rod 513 corresponding to the second gear 515 and the one-way bearing 514, in order to adjust the position of the push plate 504 conveniently, the top end of the electric push rod 517 is fixedly connected with the bottom end of the transverse plate 502, the electric push rod 517 is powered by an external power supply, a stop block is cast at the top end of the sliding rod 503, the outer diameter of the rotating wheel 506 is larger than that of the spiral plates 516, and the spiral directions of the two spiral plates 516 are opposite;
the top of the frame 1 corresponds to equidistant and symmetrical fixed lugs 518 at the two sides of the fertilizer box 219, one end of each lug 518 is connected with a screw rod 519 through threads, the other end of each screw rod 519 is rotatably connected with a rotating plate 520, and the other end of each rotating plate 520 is fixedly connected with one end of an installation arm 501.
The working principle and the using process of the invention are as follows: firstly, in the moving process of the frame 1, the turntable 203 is rotated to enable the turntable 203 to drive the screw rod 202 to rotate, so that the movable plates 204 are pushed, the distance between the two movable plates 204 is adjusted by enabling the two movable plates 204 to be arranged at one end inside the groove 201, the protective cover 206, the rotating rod 209 and the disc harrow 210 are driven to move through the matching of the rotating plate 205, the height of the disc harrow 210 is adjusted, the rotating rod 212 is driven to rotate through the rotating motor 211, meanwhile, power is transmitted through the matching of the driving wheel 213, the guide wheel 217 and the driving belt 218, the rotating rod 209 and the disc harrow 210 are driven to rotate, the soil of a construction site is overturned, and the fertility of the soil is improved;
then, in the moving process of the protective cover 206, the protective cover 206 is limited through the matching of the connecting block 207 and the telescopic rod 208, so that the protective cover 206 is prevented from deviating, in addition, through the matching of the supporting spring 215 and the fixed block 214, in the lifting process of the protective cover 206, the movable block 216 is driven to slide, and the position of the guide wheel 217 is adjusted, so that the tightness of the transmission belt 218 is always kept, the power transmission is facilitated, the rotating effect of the rotating rod 209 and the disc rake 210 is ensured, and the adaptability of the device is improved;
then, the push rod 225 and the sliding plate 223 are pushed to move in the blanking channel 220 through the cooperation of the cam 227, the screen 221 is pushed to ascend through the cooperation of the arc-shaped plate 224, then the push rod 225 and the sliding plate 223 are pushed to reset through the telescopic characteristic of the reset spring 226, the support on the screen 221 is removed, the screen 221 is reset under the action of the gravity of the balancing weight 222, the subsequent movement of the push rod 225 and the subsequent movement of the sliding plate 223 are facilitated, the screen 221 is continuously pushed to vibrate, fertilizers in the fertilizer box 219 are screened, the fertilizers are uniformly scattered, the turned-over soil is filled with the fertilizers, the fertility of the soil is further improved, and the convenience is improved for the subsequent planting of garden vegetation;
then, the containing box 401 is conveniently mounted at the front end of the frame 1 through the connecting piece 3, the connection convenience is improved, the frame 1 is convenient to push the containing box 401 and the conveying frame 403 to move through the matching of the supporting wheels 402 and the rollers 419, the flexibility of the device is ensured, then power is transmitted through the matching of the rotating shaft 416 and the belt 418 to drive the cross rod 413 and the shifting piece 414 to rotate, so that sundries and garbage on a construction site are conveniently shifted onto the conveying belt 405 from the guide plate 409, and meanwhile, through the matching of the transmission gear 417, the rotating shaft 416 and the rotating shaft 419 are driven to rotate the rotating drum 404 and the conveying belt 405 in the rotating process to convey the sundries and the garbage and are stored in a centralized mode through the containing box 401;
in addition, the baffle 406 is used for preventing the garbage and the sundries from falling off, and meanwhile, the knob 411 is rotated to drive the adjusting rod 410 to rotate so as to push the fixture block 408 and the guide plate 409 to slide along the sliding groove 407, so that the position of the guide plate 409 is adjusted, the fit degree of the guide plate 409 and the ground can be conveniently adjusted as required, the adaptability of the device is improved, and the collection effect of the sundries and the garbage is ensured;
then, in the rotating process of the supporting wheel 402, the elliptical shaft 420 is driven to rotate, the grid 421 is pushed to vibrate through the matching of the top block 422, meanwhile, through the matching of the vibration spring 425 and the limiting rod 424, an assembly is formed, the grid 421 is driven to reset conveniently in the rotating process of the elliptical shaft 420, so that the grid 421 continuously vibrates in the containing box 401, soil in sundries and garbage is vibrated down, the waste of soil is avoided, and meanwhile, the sundries and garbage are convenient to treat subsequently;
then, in the moving process of the vehicle frame 1, soil piles on the site are conveniently pushed to be flat through the push plate 504, the flatness of the construction site is guaranteed, meanwhile, the push plate 504 is pushed to move through the electric push rod 517, so that the distance between the push plate 504 and the ground is adjusted as required, the adaptability of the device is improved, in the moving process of the push plate 504, the push plate 504 is limited through the matching of the slide rod 503, the push plate 504 is prevented from deviating, in addition, when the device is not used, the screw rod 519 is rotated, the screw rod 519 is matched with the rotating plate 520, the mounting arm 501 is pulled to rotate, the push plate 504 is conveniently stored, and the convenience of the device is improved;
finally, in the process of pushing the soil by the push plate 504, the connecting rod 507 and the rotating block 508 are driven to rotate through the rotating wheel 506, meanwhile, the first gear 511 is driven to rotate through the tooth protrusion 510, then the first gear 511 drives the second gear 515 to rotate, power is transmitted, the rotating rod 513 and the spiral plate 516 are driven to rotate, in the rotating process, the first gear 511 is matched with the second gear 515 to form a speed change assembly, the rotating speed is improved, the rotating speeds of the rotating rod 513 and the spiral plate 516 are increased, soil on two sides can be conveniently driven to move between the push plates 504, the field flattening effect is improved, meanwhile, fertilizer is overturned and covered, the mixing effect of the fertilizer and the soil is improved, the fertility of the soil is further increased, and convenience is brought to the planting of subsequent gardens.
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.