A kind of elevator for lead of power overhauling tower
Technical field
The present invention relates to technical field of power rush-repair more particularly to a kind of elevator for lead of power overhauling tower.
Background technology
In recent years, China attaches great importance to the development of national grid, when leading to the damage of electric wire because of special circumstances, needs
Special repair personnel carries out repairing work, and during repairing, technical staff needs to carry new loop to repair
Work, and conducting wire is at higher position, and a stable lifting device is particularly important, and traditional loop compared with
How weight, during promotion, ensure that the stability of loop is also extremely important, and in a practical situation, it needs sometimes
The conducting wire that will fall off on the ground is promoted to again at the tie point of conducting wire to be attached again, and traditional lifting device can not
It plays fixed well to conducting wire and promotes effect, we devise a kind of elevator for lead of power overhauling tower to solve thus
Problem above.
Invention content
The purpose of the present invention is to solve existing lifting devices, and stability is insufficient during promotion, gives technology people
The safety of member threatens, existing lifting device is insufficient to the limit clamping effect of loop, causes loop easily to slide, is existing
Some lifting devices can not play the conducting wire for falling on ground to be promoted and fixed effect well, and a kind of electric power proposed
Emergent repairing tower wire lifting device can not only realize the stability in lifting process, ensure the safety of technical staff, and
Effect that is fixed well and being promoted can be played with the conducting wire on ground is fallen to loop, so as to the people that develops skill
The maintenance efficiency of member.
To achieve the goals above, present invention employs following technical solutions:
A kind of elevator for lead of power overhauling tower, including first base and second base, the first base and second base
Bottom sidewall be equipped with traveling wheel, the first base and the opposite one end side wall of second base are equipped with detent mechanism, institute
The opposite side wall for stating first base and second base is equipped with telescoping mechanism, and the telescoping mechanism includes being fixed on first base side
Round bar on wall and the protective cover being fixed on second base side wall, the round bar are internally threaded chamber, the protective cover
Be internally provided with protection chamber, the madial wall of the protection chamber is rotatably connected to the first threaded rod, and first threaded rod passes through successively
It wears the side wall of protective cover, the side wall of round bar and is threadedly coupled with thread cavity, the upper end side wall of the second base is fixedly connected with
First motor, the side wall of the protective cover, which runs through, is equipped with the opening interconnected with protection chamber, the output shaft of the first motor
End extends to protection intracavitary and is fixedly connected with the first driving wheel, and first threaded rod is located at one section of outside of protection intracavitary
Wall be fixedly connected with intermeshing first driven wheel of the first driving wheel, the upper end of the first base and second base is perpendicular
It is directly equipped with support plate, the upper end side wall of two support plates has been fixedly connected with the first fixed plate, and two described first are fixed
The side wall of plate, which runs through, is equipped with threading hole, and the upper end side wall of two first fixed plates is equipped with supporting rod, two branch
The side wall of strut is equipped with pulley, and two opposite side walls of the support plate have been fixedly connected with the second fixed plate, described in two
The opposite side wall of second fixed plate is equipped with the first T shape sliding slots, and the first T is slidably connected in two the first T shape sliding slots
The upper end side wall of shape sliding block, two first T-shaped sliders has been fixedly connected with the first fixed block, two first fixed blocks
Upper end side wall be equipped with drawstring, the upper end side wall of the first base and second base is equipped with pull rope mechanism, described in two
Drawstring passes sequentially through the threading hole of the same side, pulley and is connect with pull rope mechanism, is equipped between two first T-shaped sliders
The upper end sidewalls vertical of connection structure, the bindiny mechanism is equipped with montant, and the upper end side wall of the montant, which is fixedly connected with U-shaped, to be prevented
The upper end sidewalls vertical of backplate, the bindiny mechanism is equipped with riser, and the upper end side wall of the riser is fixedly connected with third and fixes
The sidewall symmetry of plate, the third fixed plate is set there are two the second threaded rod, and two second threaded rods are solid through third
The side wall of fixed board is simultaneously connect with its sidewall thread, and the upper end side wall of two second threaded rods has been fixedly connected with driving wheel,
Be connected with transmission belt between two driving wheels, the lateral wall of one of them second threaded rod be fixedly connected with second from
The upper end side wall of driving wheel, the third fixed plate is fixedly connected with the second motor, and the output shaft end of second motor is fixed
Be connected with intermeshing second driving wheel of the second driven wheel, be arranged with below the third fixed plate two the 4th it is solid
Fixed board, two second threaded rods run through the side wall of the 4th fixed plate of the same side and are connect with its sidewall thread, described
The bottom sidewall of third fixed plate is arranged with two position-limit mechanisms, and the side wall of two position-limit mechanisms has been fixedly connected with
One limit card block, the upper end side wall of the bottom sidewalls of two the 4th fixed plates with first limit card block of the same side are fixed
Connection, the side walls of two position-limit mechanisms have been fixedly connected with the second limit card block, two first limit card blocks with it is same
The side wall that second limit card block of side is opposite offsets, and connects between two first limit card blocks and two the second limit card blocks
It is connected to loop, the side wall of one of them the 4th fixed plate is fixedly connected with clamping device.
Preferably, the detent mechanism includes the level board being arranged on first base side wall, the side wall of the level board
Through equipped with inserted link, and the sidewall thread of the inserted link and level board connects.
Preferably, the pull rope mechanism includes the supporting block being arranged in the upper end of first base, the upper end of the supporting block
Side wall is fixedly connected with third motor, and the output shaft end of the third motor is fixedly connected with third driving wheel, the support
Rotating bar is rotatably connected between the block side wall opposite with support plate, the lateral wall of the rotating bar is fixedly connected with third actively
Intermeshing third driven wheel is taken turns, the lateral wall of the rotating bar is fixedly connected with take-up pulley, and the take-up pulley is solid with drawstring
Fixed connection.
Preferably, the bindiny mechanism includes connecting plate, and the upper end side wall of the connecting plate is equipped with non-slip mat, the connection
The both ends side wall of plate is equipped with the first limiting slot, sliding panel is slidably connected in two first limiting slots, described in two
One end side wall of the sliding panel far from the first limiting slot is fixedly connected with the second fixed block, the bottom sidewall of second fixed block with
The upper end side wall of first T-shaped slider is fixedly connected, and the bottom sidewall of the connecting plate is fixedly connected with limiting plate, the limiting plate
Bottom sidewall be equipped with the 2nd T shape sliding slots, slidably connect the second T-shaped slider, the 2nd T shapes in the 2nd T shape sliding slots
The bottom sidewall of sliding block is fixedly connected with connecting rod, and the side wall of the connecting rod is fixedly connected with the side wall of the first T-shaped slider, and
The bottom sidewall of the montant and riser is fixedly connected with the upper end side wall of connecting plate.
Preferably, the first motor, the second motor and third motor are servo motor.
Preferably, the position-limit mechanism includes the gag lever post being arranged in third fixed plate bottom sidewall, the gag lever post
Side wall is equipped with the second limiting slot, slidably connects limited block in second limiting slot, the side wall of the limited block is fixedly connected
There are third fixed block, the side wall of the third fixed block to be fixedly connected with the side wall of the first limit card block.
Preferably, the clamping device includes the 5th fixed plate being arranged on the 4th fixed plate side wall, and the described 5th is solid
The bottom sidewall of fixed board is arranged with two third threaded rods, the bottom sidewall of two the third threaded rods and the 5th fixed plate
Rotation connection, the lateral wall of two third threaded rods are threaded with elevating lever, the bottom side of two elevating levers
Wall is fixedly connected with lifter plate, and two third threaded rods run through the side wall of lifter plate and connect with its side walls, institute
It states the 5th fixed plate and the opposite side wall of lifter plate is correspondingly provided with multiple first arc fixture blocks, opposite two first arcs
It is arranged with two the second arc fixture blocks between clevis block, connects between the second arc fixture block and the first opposite arc fixture block
Multiple springs are connected to, the bottom sidewall of two third threaded rods has been fixedly connected with moving block.
Preferably, the lateral wall of two elevating levers has been fixedly connected with pointer, the bottom side of the 5th fixed plate
Wall is symmetrically fixedly connected there are two scale plate, and the side wall of two pointers is connect with the side walls of opposite scale plate.
In the present invention, when needing to will fall off when the conducting wire on ground is promoted, the fracture head of conducting wire is extended to two
Between second arc fixture block, the lifting of lifter plate can be realized under the action of moving block by rotating two moving blocks respectively,
During lifter plate is lifted, it can realize that two the second arc fixture blocks can play conducting wire good clamping effect, refer to
Under the action of needle and scale plate, the vertical lifting of lifter plate can be realized, when needing new loop carrying out clamping limit,
Loop is placed in two the second limit card blocks, the second motor is started, drives the second driving wheel and the rotation of the second driven wheel,
During the second driven wheel rotates, the rotation of one of them the second threaded rod can be realized, due to two the second threaded rods
Upper end be fixedly connected with driving wheel, and be connected with transmission belt between two driving wheels, therefore two the second spiral shells may be implemented
Rotated while rasp bar, two the second threaded rods simultaneously rotate when, due to two the 4th fixed plates with the first limit card block
Side wall be fixedly connected, and have the effect of that the first limit card block of position-limit mechanism pair plays limit, therefore may be implemented two
It falls while first limit card block, so as to realize the abundant clamping to loop, ensures the stability of loop, by
One pedestal and second base are moved to helpdesk, when needing to adjust the distance between first base and second base, Ke Yiqi
Dynamic first motor drives the first driving wheel and the rotation of the first driven wheel, to realize the separation of the first threaded rod and round bar, when the
When the distance between one pedestal and second base increase, two sliding panels slide in the first limiting slot, can ensure in this way
The stability of connecting plate, and two the second T-shaped sliders are slided in the 2nd opposite T shape sliding slots, can realize connecting plate
Stability in lifting is limited first base and second base by two inserted links, and technical staff stands in non-slip mat, opens
Two third motors are moved, two third driving wheels and two third driven wheel rotations are driven respectively, in two driven rotation of third
When dynamic, it can realize that two rotating bars and two take-up pulleies carry out take-up work, so that drawstring can be to the first fixed block
The effect of lifting is played, promotion work is carried out, when two the first fixed blocks are in lifting, two the first T-shaped sliders are opposite
The first T shapes sliding slot in sliding, to enhance stablizing effect when lifting.Structure of the invention reasonable design can not only be realized
Stability in lifting process ensures the safety of technical staff, and can be risen to loop and the conducting wire fallen on ground
To effect that is good fixed and being promoted, so as to the maintenance efficiency for the personnel of developing skill.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of elevator for lead of power overhauling tower proposed by the present invention;
Fig. 2 is schematic enlarged-scale view at a kind of A of elevator for lead of power overhauling tower proposed by the present invention;
Fig. 3 is schematic enlarged-scale view at a kind of B of elevator for lead of power overhauling tower proposed by the present invention;
Fig. 4 is schematic enlarged-scale view at a kind of C of elevator for lead of power overhauling tower proposed by the present invention;
Fig. 5 is schematic enlarged-scale view at a kind of D of elevator for lead of power overhauling tower proposed by the present invention;
Fig. 6 is a kind of company of first T-shaped slider of elevator for lead of power overhauling tower and the first T shape sliding slots proposed by the present invention
Connect schematic diagram;
Fig. 7 is position-limit mechanism and the first limit card block, second of a kind of elevator for lead of power overhauling tower proposed by the present invention
The connection side view of limit card block;
Fig. 8 is a kind of vertical view of the U-shaped protection plate of elevator for lead of power overhauling tower proposed by the present invention.
In figure:1 first base, 2 second bases, 3 first threaded rods, 4 round bars, 5 inserted links, 6 level boards, 7 supporting blocks, 8
Three motors, 9 take-up pulleies, 10 third driven wheels, 11 rotating bars, 12 third driving wheels, 13 risers, 14 loops, 15 U-shaped protections
Plate, 16 drawstrings, 17 second fixed plates, 18 support plates, 19 pulleys, 20 supporting rods, 21 first driving wheels, 22 protective covers, 23 first
Motor, 24 first driven wheels, 25 connecting plates, 26 second fixed blocks, 27 first fixed blocks, 28 first T-shaped sliders, 29 connecting rods,
30 second T-shaped sliders, 31 limiting plates, 32 non-slip mats, 33 first limiting slots, 34 montants, 35 sliding panels, 36 the 5th fixed plates, 37
4th fixed plate, 38 scale plates, 39 pointers, 40 third threaded rods, 41 moving blocks, 42 springs, 43 lifter plates, 44 elevating levers, 45
First arc fixture block, 46 second arc fixture blocks, 47 transmission belts, 48 driving wheels, 49 third fixed plates, 50 second threaded rods, 51
One limit card block, 52 gag lever posts, 53 second limit card blocks, 54 third fixed blocks, 55 limited blocks, 56 second limiting slots, 57 second
Motor, 58 second driven wheels, 59 second driving wheels, 60 first fixed plates.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Referring to Fig.1-8, a kind of elevator for lead of power overhauling tower, including first base 1 and second base 2, the first bottom
The bottom sidewall of seat 1 and second base 2 is equipped with traveling wheel, and first base 1 and the opposite one end side wall of second base 2 are equipped with
The opposite side wall of detent mechanism, first base 1 and second base 2 is equipped with telescoping mechanism, and the purpose of telescoping mechanism is for reality
The adjusting of existing distance between first base 1 and second base 2, so as to meet the actual demand of different situations, telescoping mechanism packet
The protective cover 22 for including the round bar 4 being fixed on 1 side wall of first base and being fixed on 2 side wall of second base, the inside of round bar 4 are set
There are thread cavity, protective cover 22 to be internally provided with protection chamber, the madial wall of chamber is protected to be rotatably connected to the first threaded rod 3, the first spiral shell
Rasp bar 3 sequentially passes through the side wall of protective cover 22, the side wall of round bar 4 and is threadedly coupled with thread cavity, the upper end side wall of second base 2
It is fixedly connected with first motor 23, the side wall of protective cover 22, which runs through, is equipped with the opening interconnected with protection chamber, first motor 23
Output shaft end extend to protection intracavitary and be fixedly connected with the first driving wheel 21, the first threaded rod 3 is located at protection intracavitary
One section of lateral wall be fixedly connected with 21 intermeshing first driven wheel 24 of the first driving wheel, the setting of protective cover 22 be in order to
, can be by external influence when preventing the first driving wheel 21 and the second driving wheel 24 from rotating, and avoid the peace to technical staff
It threatens entirely, the upper end of first base 1 and second base 2 is equipped with support plate 18, the upper end side of two support plates 18 vertically
Wall has been fixedly connected with the first fixed plate 60, and the side wall of two the first fixed plates 60, which runs through, is equipped with threading hole, and threading hole can
The effect of limit is played to drawstring 16, the upper end side wall of two the first fixed plates 60 is equipped with supporting rod 20, two supporting rods 20
Side wall be equipped with pulley 19, two opposite side walls of support plate 18 have been fixedly connected with the second fixed plate 17, and two second are solid
The opposite side wall of fixed board 17 is equipped with the first T shape sliding slots, and the first T-shaped slider 28 is slidably connected in two the first T shape sliding slots,
The upper end side wall of two the first T-shaped sliders 28 has been fixedly connected with the first fixed block 27, the upper end side of two the first fixed blocks 27
Wall is equipped with drawstring 16, and the upper end side wall of first base 1 and second base 2 is equipped with pull rope mechanism, and two drawstrings 16 are successively
It connect by the threading hole of the same side, pulley 19 and with pull rope mechanism, connection structure is equipped between two the first T-shaped sliders 28,
The upper end sidewalls vertical of bindiny mechanism is equipped with montant 34, and the upper end side wall of montant 34 is fixedly connected with U-shaped protection plate 15, and U-shaped is anti-
Backplate 15 can provide technical staff the effect of protection, ensure the safety of technical staff, the upper end sidewalls vertical of bindiny mechanism
Equipped with riser 13, the upper end side wall of riser 13 is fixedly connected with third fixed plate 49, and the sidewall symmetry of third fixed plate 49 is equipped with
Two the second threaded rods 50, two the second threaded rods 50 run through the side wall of third fixed plate 49 and are connect with its sidewall thread,
The upper end side wall of two the second threaded rods 50 has been fixedly connected with driving wheel 48, and transmission belt is connected between two driving wheels 48
47, the lateral wall of one of them the second threaded rod 50 is fixedly connected with the second driven wheel 58, the upper end side wall of third fixed plate 49
It is fixedly connected with the second motor 57, the output shaft end of the second motor 57 is fixedly connected with intermeshing with the second driven wheel 58
The lower section of second driving wheel 59, third fixed plate 49 is arranged with two the 4th fixed plates 37, and two the second threaded rods 50 pass through
It wears the side wall of the 4th fixed plate 37 of the same side and is connect with its sidewall thread, the bottom sidewall of third fixed plate 49 is arranged with
Two position-limit mechanisms, the setting of position-limit mechanism be in order to ensure that two the first limit card blocks 15 can be vertically moved up or down and will not deviate,
The side wall of two position-limit mechanisms has been fixedly connected with the first limit card block 51, the bottom sidewalls of two the 4th fixed plates 37 with together
The upper end side wall of first limit card block 51 of side is fixedly connected, and the side wall of two position-limit mechanisms has been fixedly connected with the second limit
Fixture block 53, two the first limit card block 51 side walls opposite with second limit card block 53 of the same side offset, two first limits
It is connected with loop 14 between fixture block 51 and two the second limit card blocks 53, the side wall of one of them the 4th fixed plate 37, which is fixed, to be connected
It is connected to clamping device, clamping device can play clamping and fixed effect to the conducting wire for falling on ground.
In the present invention, detent mechanism includes the level board 6 being arranged on 1 side wall of first base, and the side wall of level board 6 runs through
Equipped with inserted link 5, and inserted link 5 is connect with the sidewall thread of level board 6, can ensure the stabilization of first base 1 and second base 1
Property, pull rope mechanism includes the supporting block 7 being arranged in the upper end of first base 1, and the upper end side wall of supporting block 7 is fixedly connected with third
The output shaft end of motor 8, third motor 8 is fixedly connected with third driving wheel 12, the side wall opposite with support plate 18 of supporting block 7
Between be rotatably connected to rotating bar 11, the lateral wall of rotating bar 11 be fixedly connected with 12 intermeshing third of third driving wheel from
The lateral wall of driving wheel 10, rotating bar 11 is fixedly connected with take-up pulley 9, and take-up pulley 9 is fixedly connected with drawstring 16, when startup rope draging machine
When structure, you can realize the effect that two the first fixed blocks 27 are played with promotion, ensure that the progress for promoting work, bindiny mechanism include
The upper end side wall of connecting plate 25, connecting plate 25 is equipped with non-slip mat 32, and non-slip mat 32 can enhance the protection to technical staff, connects
The both ends side wall of plate 25 is equipped with the first limiting slot 33, slidably connects sliding panel 35 in two the first limiting slots 33, two
One end side wall of the sliding panel 35 far from the first limiting slot 33 is fixedly connected with the second fixed block 26, the bottom side of the second fixed block 26
Wall is fixedly connected with the upper end side wall of the first T-shaped slider 28, and the bottom sidewall of connecting plate 25 is fixedly connected with limiting plate 31, limit
The bottom sidewall of plate 31 is equipped with the 2nd T shape sliding slots, and the second T-shaped slider 30, the 2nd T are slidably connected in the 2nd T shape sliding slots
The bottom sidewall of shape sliding block 30 is fixedly connected with connecting rod 29, and the side wall of connecting rod 29 and the side wall of the first T-shaped slider 28 are fixed
Connection, and the bottom sidewall of montant 34 and riser 13 is fixedly connected with the upper end side wall of connecting plate 25, when first base 1 and the
When two pedestals 2 detach, the sliding in the first limiting slot 33 of two sliding panels 35, two the second T-shaped sliders 30 are respectively opposite
Sliding in 2nd T shapes sliding slot, such purpose is to make it will not be due to first base 1 to ensure the stability of connecting plate 25
It detaches and impacts with second base 2, ensure stability when its promotion, first motor 23, the second motor 57 and third electricity
Machine 8 is servo motor, and position-limit mechanism includes the gag lever post 52 being arranged in 49 bottom sidewall of third fixed plate, the side of gag lever post 52
Wall is equipped with the second limiting slot 56, slidably connects limited block 55 in the second limiting slot 56, the side wall of limited block 55 is fixedly connected with
Third fixed block 54, the side wall of third fixed block 54 are fixedly connected with the side wall of the first limit card block 51, can ensure the first limit
Position fixture block 52 can be vertically moved up or down, and clamping device includes the 5th fixed plate 36 being arranged on 37 side wall of the 4th fixed plate, and the 5th
The bottom sidewall of fixed plate 36 is arranged with two third threaded rods 40, the bottom of two third threaded rods 40 and the 5th fixed plate 36
Portion's side wall rotation connection, the lateral wall of two third threaded rods 40 are threaded with elevating lever 44, the bottom of two elevating levers 44
Portion's side wall is fixedly connected with lifter plate 43, and two third threaded rods 40 run through the side wall of lifter plate 43 and connect with its side walls
It connects, the 5th fixed plate 36 and the opposite side wall of lifter plate 43 are correspondingly provided with multiple first arc fixture blocks 45, opposite two
Two the second arc fixture blocks 46, the second arc fixture block 46 and the first opposite arc fixture block are arranged between one arc fixture block 45
Multiple springs 42 are connected between 45, the bottom sidewall of two third threaded rods 40 has been fixedly connected with moving block 41, clamping machine
Structure is to be convenient for the promotion work of next step, the lateral wall of two elevating levers 44 in order to which the conducting wire for falling on ground is clamped
Pointer 39 has been fixedly connected with it, the bottom sidewall of the 5th fixed plate 36 is symmetrically fixedly connected with that there are two scale plate 38, two pointers
39 side wall is connect with the side walls of opposite scale plate 38, can ensure two 44 synchronization liftings of elevating lever.
In the present invention, when needing to will fall off when the conducting wire on ground is promoted, the fracture head of conducting wire is extended to two
Between second arc fixture block 46, lifter plate 43 can be realized under the action of moving block 41 by rotating two moving blocks 41 respectively
Lifting, during lifter plate 43 is lifted, can realize that two the second arc fixture blocks 46 can play conducting wire on good folder
Holding effect fruit can realize the vertical lifting of lifter plate 43 under the action of pointer 39 and scale plate 38, when needing new conducting wire
When circle 14 carries out clamping limit, loop 14 is placed in two the second limit card blocks 53, starts the second motor 57, drives the
Two driving wheels 59 and the second driven wheel 58 rotation, during the second driven wheel 58 rotates, can realize one of them second
The rotation of threaded rod 50, since the upper end of two the second threaded rods 50 has been fixedly connected with driving wheel 48, and two driving wheels 48
Between be connected with transmission belt 47, therefore may be implemented to rotate while two the second threaded rod 50, in two the second threaded rods 50
When rotating simultaneously, since two the 4th fixed plates 37 are fixedly connected with the side wall of the first limit card block 51, and with limit
The first limit card block of mechanism pair 51 plays the effect of limit, therefore may be implemented to fall while two the first limit card block 51,
So as to realize the abundant clamping to loop 14, ensure the stability of loop 14, by first base 1 and second base 2
It is moved to helpdesk, when needing to adjust the distance between first base 1 and second base 2, first motor 23, band can be started
Dynamic first driving wheel 21 and the rotation of the first driven wheel 24, to realize the separation of the first threaded rod 3 and round bar 4, when first base 1
When the distance between second base 2 increases, the sliding in the first limiting slot 33 of two sliding panels 35 can ensure to connect in this way
The stability of fishplate bar 25, and two the second T-shaped sliders 30 are slided in the 2nd opposite T shape sliding slots, can realize connection
Stability of the plate 25 in lifting, is limited first base 1 and second base 2 by two inserted links 5, technical staff stands anti-skidding
On pad 32, start two third motors 8, drives two third driving wheels 12 and two third driven wheels 10 to rotate respectively, two
When a third driven wheel 10 rotates, it can realize that two rotating bars 11 and two take-up pulleies 9 carry out take-up work, so that drawing
Rope 16 can play the first fixed block 27 effect of lifting, carry out promotion work, when two the first fixed blocks 27 are in lifting,
Two the first T-shaped sliders 28 are slided in the first opposite T shape sliding slots, to enhance stablizing effect when lifting.
More than, it is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, it is any
Those familiar with the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its invents
Design is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.