Mixing and dissolving device for processing wind power anti-corrosion material
Technical Field
The invention relates to the technical field of mixing devices, in particular to a mixing and dissolving device for processing wind power anti-corrosion materials.
Background
Among the wind power anti-corrosion materials, the anti-corrosion coating is a coating material with an anti-corrosion outer surface, and the anti-corrosion coating can protect wind power equipment from environmental corrosion and prolong the service life. The anticorrosive paint generally has excellent anticorrosive performance, weather resistance, chemical corrosion resistance and good adhesion and durability, when the anticorrosive paint is used, main materials of the anticorrosive paint such as aqueous resin, epoxy resin and the like, preservative, pigment, filler and necessary additives such as defoamer, film forming agent, dispersing agent and the like are prepared according to the formula proportion, and then raw materials are gradually added into a stirring container according to a certain sequence for full mixing. For resin materials such as epoxy resin, the dissolution temperature and time should be controlled to ensure complete dissolution of the resin.
When the auxiliary materials are added in the process of mixing the anticorrosive paint, the existing paint mixing device generally directly pours the bagged powdery auxiliary materials into a barrel for mixing, the poured powdery auxiliary materials are easy to rise to form a large amount of smoke dust, the smoke dust not only can pollute the surrounding working environment, but also can threaten the health of a respiratory system when workers are exposed in the environment for a long time.
Disclosure of Invention
The invention provides a mixing and dissolving device for processing wind power anti-corrosion materials, which has the beneficial effect of preventing dust from flying, and solves the problems that when auxiliary materials are added in the process of mixing anti-corrosion paint in the prior art, the prior paint mixing device generally directly pours bagged powdery auxiliary materials into a barrel for mixing, the poured powdery auxiliary materials are easy to rise to form a large amount of smoke dust, the smoke dust not only pollutes the surrounding working environment, but also threatens the health of a respiratory system when workers are exposed in the environment for a long time.
The invention provides a mixed dissolving device for processing wind power anti-corrosion materials, which comprises a paint barrel body, wherein a fixed barrel cover is arranged at the top of the paint barrel body, a motor is fixedly connected to the top of the fixed barrel cover, an output end of the motor is fixedly connected with a stirrer, one end of the stirrer extends to the inside of the paint barrel body, one side of the top of the fixed barrel cover is fixedly connected with an auxiliary material box, the bottom of the auxiliary material box is communicated with a conical barrel, the bottom of the conical barrel is rotationally connected with a connecting pipe, the bottom of the connecting pipe is communicated with a distribution disc, and one side of the bottom of the distribution disc is communicated with a distribution head.
As an alternative scheme of the mixed dissolving device for processing the wind power anticorrosive material, the outer side of the stirrer is fixedly connected with a distributing mechanism, the distributing mechanism comprises a cam, the cam is fixedly connected to the outer side of the stirrer, one side of the cam is slidably connected with a first transmission plate, one end of the first transmission plate is fixedly connected with a connecting plate, one end of the connecting plate is fixedly connected with an adjusting toothed plate, the outer side of the connecting plate is fixedly connected with an adjusting gear, the adjusting toothed plate is meshed with the adjusting gear and is connected with a connecting frame, one side of the connecting frame is fixedly connected with a first spring, two sides of the bottom of the fixed barrel cover are fixedly connected with extension plates, and one end of the first spring is fixedly connected with the extension plates.
As an alternative scheme of the mixed dissolving device for processing the wind power anti-corrosion material, the bottom of the material distribution head is provided with the material distribution plate, the bottom of the material distribution plate is fixedly connected with the fixed column, one end of the fixed column is fixedly connected with the supporting bottom plate, one end of the supporting bottom plate is fixedly connected with the extension plate, one side of the top of the material distribution plate is fixedly connected with the material distribution plate, one side of the top of the material receiving plate is provided with the material guide plate, one end of the material guide plate is fixedly connected with the material distribution plate, the top of the material distribution plate is fixedly connected with the guide block, and the guide block is positioned at the center position of the bottom of the material distribution plate.
The mixing and dissolving device for processing the wind power anticorrosive material is characterized in that a connecting rubber pad is fixedly connected to the outer side of the stirrer, a material receiving disc is fixedly connected to the outer side of the connecting rubber pad, a plurality of material scattering grooves are formed in the outer side of the material receiving disc, the number of the material scattering grooves is several, the material scattering grooves are distributed in an annular equidistant mode, protruding blocks are fixedly connected to the bottom of the material receiving disc, a second transmission plate is fixedly connected to the bottom of the material scattering disc, and one end of the second transmission plate extends to the bottom of the material receiving disc.
The mixed dissolving device for processing the wind power anti-corrosion material is characterized in that an installation groove is formed in the inner portion of the fixed barrel cover, a transparent observation plate is fixedly connected to the inner portion of the installation groove, an installation plate is movably connected to the bottom of the fixed barrel cover, a scraping plate is fixedly connected to the top of the installation plate, the top of the scraping plate is abutted to the transparent observation plate, a base plate is arranged on one side of the installation plate, a second spring is fixedly connected to one side of the base plate, one end of the second spring is fixedly connected with the installation plate, a third transmission plate is fixedly connected to the side wall of the installation plate, and the third transmission plate is in contact with the connection plate.
As an alternative scheme of the mixed dissolving device for processing the wind power anti-corrosion material, the outer side of the connecting plate is connected with a fixed sleeve in a sliding manner, and one side of the fixed sleeve is fixedly connected with a fixed barrel cover.
As an alternative scheme of the mixed dissolving device for processing the wind power anti-corrosion material, a clamping seat is fixedly connected to the bottom of the fixed barrel cover, a sealing ring is fixedly connected to the inner side of the clamping seat, and the inner side of the sealing ring is abutted to the outer side of the coating barrel body.
As an alternative scheme of the mixing and dissolving device for processing the wind power anti-corrosion material, the top of the auxiliary box is connected with the rotary sealing cover through threads, the top of the rotary sealing cover is fixedly connected with the handle, and the handle is positioned at the center of the top of the rotary sealing cover.
As an alternative scheme of the mixed dissolving device for processing the wind power anti-corrosion material, a support column is sleeved in the first spring, one end of the support column is fixedly connected with the side wall of the extension plate, and the support column is in clearance fit with the first spring.
As an alternative scheme of the mixed dissolving device for processing the wind power anti-corrosion material, an annular groove is formed in the outer side of the distribution plate, a fixing ring is connected in the annular groove in a rotating mode, one side of the fixing ring is fixedly connected with a support, and one side of the support is fixedly connected with an extension plate.
The invention has the following beneficial effects:
1. This wind-powered electricity generation anticorrosive material processing is with mixing dissolving device, through setting up fixed bung and auxiliary tank, auxiliary material pours into the auxiliary tank in advance, then in entering toper bucket, connecting pipe and cloth dish through the auxiliary tank, and discharge in to the coating staving through the cloth stub bar, because the cooperation of fixed bung and coating staving, can make the coating staving form airtight space, and then can play the problem that prevents the auxiliary material and raise when the anticorrosive coating in the agitator stirring coating staving and the auxiliary material of interpolation, not only can protect the surrounding environment not by the auxiliary material pollution of raising, can also play good guard action to workman's health.
2. This wind-powered electricity generation anticorrosive material processing is with mixing dissolving device, through setting up cloth mechanism, can drive cloth head through cloth mechanism and constantly rotate, can fall into the auxiliary material discharge in the cloth dish with top auxiliary material case through toper bucket and connecting pipe when the cloth head is rotatory, the even downward spill of in-process that the cloth head was rotatory of exhaust auxiliary material, evenly spill the auxiliary material mix dissolving efficiency higher with anticorrosive paint at the in-process of agitator stirring, the condition that the auxiliary material agglomeration is difficult to dissolve appears when mixing stirring in pouring the auxiliary material into anticorrosive paint bucket in full once can not appear, prevent to mix and lead to the condition that the concentration appears in the local area of auxiliary material in anticorrosive paint because auxiliary material agglomeration back.
3. This wind-powered electricity generation anticorrosive material processing is with mixing dissolving device, through setting up receiving tray, lug and second drive plate, can drive receiving tray constantly rotatory in the time of the agitator is rotatory, and then drive the lug rotatory through receiving tray, along with the continuous rotation of a plurality of lug with the conflict of second drive plate, can make receiving tray constantly switch between right side high left side low and the back level that resets, and then make receiving tray constantly rock, the lower receiving tray in left side after rocking can discharge more filler in the inside left side region of coating staving through the bulk groove, form complementation with the regional discharge in the inside right side of cloth head to the coating staving, make the scattering of filler in the coating staving more even, and along with receiving tray constantly rock, can effectively prevent the filler to pile up the jam bulk groove in the bulk groove, improve receiving tray discharge efficiency.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic cross-sectional view of a paint bucket according to the present invention.
Fig. 3 is a schematic structural view of an adjusting toothed plate and an adjusting gear according to the present invention.
Fig. 4 is a schematic structural view of the bulk tray and the receiving tray of the present invention.
Fig. 5 is a schematic structural view of the bulk material tray of the present invention.
Fig. 6 is a schematic view of the structure of the transparent viewing plate and the squeegee according to the invention.
Fig. 7 is a schematic view of the state-changing structure of the receiving tray of the present invention.
Fig. 8 is an enlarged schematic view of the structure of fig. 2 a according to the present invention.
The paint bucket body, 2, a motor, 3, a stirrer, 4, an auxiliary material box, 5, a conical bucket, 6, a connecting pipe, 7, a distributing disc, 8, a distributing head, 901, a cam, 902, a first transmission plate, 903, a connecting plate, 904, an adjusting toothed plate, 905, an adjusting gear, 906, a connecting frame, 907, a first spring, 908, an extension plate, 10, a bulk material tray, 11, a fixed column, 12, a supporting bottom plate, 13, a bulk material plate, 14, a material guide plate, 15, a guide block, 16, a connecting rubber pad, 17, a material receiving tray, 18, a bulk material groove, 19, a bump, 20, a second transmission plate, 21, a mounting groove, 22, a transparent observation plate, 23, a mounting plate, 24, a scraping plate, 25, a base plate, 26, a second spring, 27, a third transmission plate, 28, a fixed sleeve, 29, a clamping seat, 30, a sealing ring, 31, a rotary sealing cover, 32, a handle, 33, a support column, 34, an annular groove, 35, a fixed ring, 36, a support, 37 and a fixed bucket cover.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 8, a hybrid dissolving device for processing wind power anti-corrosion materials includes a paint bucket body 1, a fixed bucket cover 37 is arranged at the top of the paint bucket body 1, a motor 2 is fixedly connected to the top of the fixed bucket cover 37, a stirrer 3 is fixedly connected to the output end of the motor 2, the stirrer 3 is composed of a rod body and stirring blades, the stirring blades are fixedly connected to the outer side of the rod body, one end of the rod body of the stirrer 3 extends to the interior of the paint bucket body 1, the stirring blades are located in the paint bucket body 1, an auxiliary material box 4 is fixedly connected to one side of the top of the fixed bucket cover 37, the motor 2 is fixedly connected with the auxiliary material box 4, a conical bucket 5 is communicated to the bottom of the auxiliary material box 4, the diameter of the top end of the conical head is greater than the diameter of the bottom end of the conical bucket, a connecting pipe 6 is rotationally connected to the bottom of the conical bucket 5, a distributing disc 7 is communicated to the bottom of the connecting pipe 6, one side of the bottom of the distributing disc 7 is communicated with a distributing head 8, and the distributing head 8 is located at a position deviating from the center of the bottom of the distributing disc 7.
The top fixedly connected with cloth mechanism in the agitator 3 outside, cloth mechanism includes cam 901, cam 901 fixed connection is in the outside of agitator 3, one side sliding connection of cam 901 has first drive plate 902, the one end fixedly connected with connecting plate 903 of first drive plate 902, the one end fixedly connected with of connecting plate 903 adjusts pinion rack 904, the outside fixedly connected with adjusting gear 905 of connecting pipe 6, adjust pinion rack 904 and adjusting gear 905 meshing and be connected, the one end fixedly connected with link 906 of adjusting pinion rack 904, one side fixedly connected with first spring 907 of link 906, the quantity of first spring 907 is a plurality of, and the equal distance distribution of a plurality of first spring 907, the both sides of fixed bung 37 bottom all fixedly connected with extension board 908, extension board 908 is the arc setting, the one end of first spring 907 and the inboard fixed connection of extension board 908.
The working principle of the embodiment is that after a paint bucket body 1 is opened, a fixed bucket cover 37 is moved, the fixed bucket cover 37 drives an integral structure to be placed into the paint bucket body 1 from top to bottom, then a motor 2 is started, the output end of the motor 2 drives a stirrer 3 to rotate, when the stirrer 3 rotates to stir anticorrosive paint, the stirrer 3 drives an outer cam 901 to rotate, the cam 901 drives a first transmission plate 902 to move to the right side after rotating, the first transmission plate 902 drives a connecting plate 903 to move to the right side, the connecting plate 903 drives an adjusting toothed plate 904 to move to the right side, the adjusting toothed plate 904 is driven to move to the right side and then drives an adjusting gear 905 to rotate, the adjusting gear 905 rotates and then drives a connecting pipe 6 to rotate, the connecting pipe 6 drives a cloth disc 7 at the bottom to rotate, the cloth head 8 eccentrically arranged at the bottom is driven to rotate after rotating, and when the protruding part of the cam 901 rotates to the left side and is not contacted with the first transmission plate 902, the elastic force applied by a first spring to the connecting frame 906 drives the first transmission plate 902 to move to the left side through the connecting frame 906, the first transmission plate 902 moves to the left side after rotating the connecting plate 903, and then drives the cloth disc 7 to rotate reversely, and the cam 901 continues to rotate reversely through the first transmission plate 7 repeatedly;
along with the rotation of cloth dish 7, can drive cloth head 8 constantly rotate, can fall into the supplementary material discharge of cloth in the dish 7 with top supplementary case 4 through toper bucket 5 and connecting pipe 6 when cloth head 8 is rotatory, the even downward spill of in-process that the cloth head 8 was rotatory of exhaust auxiliary material can, evenly spill the auxiliary material in the in-process of agitator 3 stirring with anticorrosive paint's mixed dissolution efficiency higher, the condition that the difficult dissolution of auxiliary material agglomeration appears when can not appear pouring the auxiliary material into the anticorrosive paint bucket in full once and mixing the stirring, prevent to mix and lead to the condition that the concentration appears in the local area of auxiliary material in the anticorrosive paint because of the auxiliary material agglomeration back.
In the second embodiment, the improvement is made on the basis of the first embodiment, specifically, please refer to fig. 1 to 8, the bottom of the distribution head 8 is provided with a bulk cargo tray 10, the bulk cargo tray 10 is in a circular truncated cone shape, the diameter length of the top of the bulk cargo tray 10 is smaller than the diameter length of the bottom of the bulk cargo tray 10, the center position of the bottom of the bulk cargo tray 10 is fixedly connected with a fixed column 11, the bottom of the fixed column 11 is fixedly connected with a supporting bottom plate 12, one end of the supporting bottom plate 12 is fixedly connected with an extension plate 908, the top of the supporting bottom plate 12 is in a sharp angle shape, auxiliary materials are favorably guided to fall, the auxiliary materials can be effectively prevented from being accumulated at the top of the supporting bottom plate 12 when falling, the right side of the top of the bulk cargo tray 10 is fixedly connected with a plurality of bulk cargo trays 13, the plurality of bulk cargo trays 13 are in annular equidistant distribution, one side of the top of the receiving tray 17 is provided with two guide plates 14, one end of the guide plates 14 is fixedly connected with the bulk cargo tray 13, the two guide plates 14 are fixedly connected with the two guide plates 14, the two guide plates 14 are arranged in the bottom of the two guide plates 13, the two guide plates are favorably arranged at the bottom of the two guide plates 13, the guide blocks 15 are favorably arranged at the bottom of the guide plate 15, the guide blocks 15 are favorably arranged at the center of the bottom of the guide plate 15, and are favorably arranged at the bottom of the guide plate 15, and are favorably to be arranged at the bottom of the guide plate 15.
The outside fixedly connected with of agitator 3 connects cushion 16, connects cushion 16 and is the elasticity material, connects the outside fixedly connected with of cushion 16 and connects charging tray 17, connects the outside of charging tray 17 to offer the scattered silo 18, and the quantity of scattered silo 18 is a plurality of, and a plurality of scattered silo 18 is annular equidistance and distributes, connects the bottom fixedly connected with lug 19 of charging tray 17, and the quantity of lug 19 is a plurality of, and a plurality of lug 19 is annular equidistance and distributes, the bottom fixedly connected with second drive plate 20 of bulk cargo tray 10, and the one end of second drive plate 20 extends to the bottom that connects charging tray 17.
Because the distribution head 8 is positioned in the right side area inside the paint bucket body 1 to rotationally discharge auxiliary materials, the auxiliary materials cannot be discharged in the left side area inside the paint bucket body 1, so that the uniformity of the auxiliary materials discharged in the paint bucket body 1 can be reduced, after the distribution head 8 rotationally discharges materials, the auxiliary materials fall on the top of the distribution disk 10 and are discharged downwards through the distribution plate 13, so that the auxiliary materials are uniformly discharged downwards in the anticorrosive paint, and the two guide plates 14 arranged in a mirror image manner can guide the auxiliary materials falling from the distribution plate 13 positioned at the top of the distribution disk 17, so that the auxiliary materials can accurately fall into the distribution disk 17 to play a guiding role;
along with the auxiliary material gets into in the receiving tray 17, because the continuous rotation of agitator 3, can drive receiving tray 17 constantly rotate in its rotatory, rotatory receiving tray 17 can be with the auxiliary material of inside access through a plurality of bulk groove 18 discharge, and because the existence of a plurality of lug 19, at receiving tray 17 rotatory in-process, lug 19 can conflict with second drive plate 20, and make receiving tray 17 take place deformation under the effect of second drive plate 20, and then make receiving tray 17 right side high and left side low, after lug 19 and second drive plate 20 separation, receiving tray 17 can reset under the elastic action of connecting cushion 16, and the continuous rotation of a plurality of lug 19 can make receiving tray 17 constantly be in right side high left side low with reset between the level, and then make receiving tray 17 constantly rock, the lower receiving tray 17 of back left side can be through bulk groove 18 to the inside left side region of coating bucket 1 in discharge more, with the inside of scattering head 8 to the inside of coating bucket 1, and the continuous expansion joint of material groove 18 can form the even discharge bucket 17 with the continuous expansion joint of filling, can prevent to fill material bucket 17 from piling up with the continuous expansion joint of the inside the coating bucket 1.
The inside of fixed bung 37 has been seted up mounting groove 21, the inside fixedly connected with transparent observation board 22 of mounting groove 21, transparent observation board 22 is fan-shaped setting, the bottom of fixed bung 37 is rotated through the pivot and is connected with mounting panel 23, the top fixedly connected with scraper 24 of mounting panel 23, scraper 24 is made for elastic material, the top of scraper 24 is contradicted with transparent observation board 22, one side of mounting panel 23 is provided with base plate 25, one side fixedly connected with second spring 26 of base plate 25, the one end and the mounting panel 23 fixed connection of second spring 26, the second spring 26 applys the pulling force to mounting panel 23, the lateral wall fixedly connected with third drive plate 27 of mounting panel 23, third drive plate 27 and connecting plate 903 contact.
In the process of mixing and dissolving the anticorrosive paint and the auxiliary materials, workers are required to observe the mixed and dissolved condition, in order to prevent dust from rising, the paint barrel body 1 is sealed by the fixed barrel cover 37 and then can only be observed by the transparent observation plate 22, if obvious agglomeration or undissolved phenomenon exists, in the observation process, the paint barrel body 1 rises in the paint barrel body due to discharge of the filler and then adheres to the transparent observation plate 22 to influence the observation of workers, through the arrangement of the scraping plate 24, when the connecting plate 903 is pushed to move leftwards by the elastic force of the first spring 907, the connecting plate 903 pushes the third transmission plate 27 in the process of moving leftwards, the third transmission plate 27 drives the mounting plate 23 to swing backwards by taking the connecting position of the mounting plate with the rotating shaft of the fixed barrel cover 37 as the center, the swinging mounting plate 23 drives the scraping plate 24 at the top to swing backwards, and the scraping plate 24 rubs with the bottom of the fan-shaped transparent observation plate 22 after swinging, so that the auxiliary materials adhered to the bottom of the transparent observation plate 22 are scraped cleanly, and the observation of workers is facilitated;
After the connecting plate 903 is driven to move to the right by the cam 901, the mounting plate 23 is pulled to reset by the pulling force of the second spring 26, so that the scraper 24 is pushed to continuously clean the transparent observation plate 22 after the connecting plate 903 moves to the left next time, the transparent observation plate 22 can be cleaned by continuously cleaning the transparent observation plate 22, dust adhered to the transparent observation plate 22 can be cleaned after the auxiliary materials in the paint bucket body 1 are lifted, the observation sight of workers is further ensured, the mixed dissolution condition between the anticorrosive paint and the auxiliary materials can be observed in real time, and the efficiency of mixed dissolution between the anticorrosive paint and the auxiliary materials is improved.
The outside of the connecting plate 903 is slidably connected with a fixing sleeve 28, and one side of the fixing sleeve 28 is fixedly connected with a fixing barrel cover 37.
By providing the fixing sleeve 28, the fixing sleeve 28 plays a limiting role on the outer side of the connecting plate 903, so that the connecting plate 903 is more stable when sliding left and right, and the shaking unstable condition when sliding left and right is not easy to occur.
The bottom fixedly connected with clamping seat 29 of fixed bung 37, clamping seat 29 are cyclic annular setting, and the inboard fixedly connected with sealing washer 30 of clamping seat 29, sealing washer 30 are cyclic annular setting, and the inboard of sealing washer 30 is contradicted with the outside of scribbling bucket body 1.
Through setting up joint seat 29 and sealing washer 30, joint seat 29 and sealing washer 30 can ensure the leakproofness between fixed bung 37 and the coating staving 1, and can absorb the partial vibration when fixed bung 37 top motor 2 operates, guarantees the stability when fixed bung 37 top motor 2 operates.
The top of the auxiliary box 4 is connected with a rotary sealing cover 31 in a threaded manner, the top of the rotary sealing cover 31 is fixedly connected with a handle 32, and the handle 32 is positioned at the center of the top of the rotary sealing cover 31.
Through setting up rotary seal lid 31 and handle 32, can rotate rotary seal lid 31 through handle 32, be convenient for open auxiliary material case 4, can pour the auxiliary material into auxiliary material case 4 after opening, be convenient for follow-up auxiliary material in with anticorrosive paint's mixing process add in the coating bucket body 1.
The first spring 907 is internally sleeved with a support column 33, the right side of the support column 33 is fixedly connected with the side wall of the extension plate 908, the left side of the support column 33 is not contacted with the connecting frame 906, a gap exists, and the support column 33 is in clearance fit with the first spring 907.
By arranging the support column 33, the support column 33 can play a supporting role in the first spring 907 after being compressed, so that the first spring 907 is not easy to deform and bend after being contracted, and when the first spring 907 is compressed, a gap exists between the left side of the support column 33 and the connecting frame 906, and the movement of the connecting frame 906 to the right side can not be blocked.
An annular groove 34 is formed in the outer side of the cloth disc 7, a fixing ring 35 is connected to the inner portion of the annular groove 34 in a rotating mode, a support 36 is fixedly connected to one side of the fixing ring 35, and one side of the support 36 is fixedly connected with the extension plate 908.
Through setting up ring channel 34, solid fixed ring 35 and support 36, support 36 is connected solid fixed ring 35 and extension board 908, and gu fixed ring 35 can play the restriction effect to cloth dish 7 in ring channel 34, makes cloth dish 7 rotatory time more stable, reduces the rocking of cloth dish 7 rotatory time.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.