阅读说明：本技术 一种钢锯片及其生产装置和工艺 (Steel saw blade and production device and process thereof ) 是由 李小娟 江平 王世祥 唐万清 余刚 蔡年刚 张志宽 许元强 刘强 罗能开 于 2021-07-13 设计创作，主要内容包括：本发明公开了一种钢锯片,它由按以下质量百分比组成：0.55～0.75%C、0.1～0.4%Si、0.3～0.6%Mn、0～0.01%S、0～0.01%P、0.4～0.7%Cr、0～0.4%Ni、0～0.1%Nb、0～0.03%Al,其余为钢；它还公开了该钢锯片的打磨装置和方法。本发明的有益效果是：具有很好的淬透性和红硬性、使用寿命长、提高磨削效率、减轻工人劳动强度。(The invention discloses a steel saw blade, which consists of the following components in percentage by mass: 0.55-0.75% of C, 0.1-0.4% of Si, 0.3-0.6% of Mn, 0-0.01% of S, 0-0.01% of P, 0.4-0.7% of Cr, 0-0.4% of Ni, 0-0.1% of Nb, 0-0.03% of Al and the balance of steel; it also discloses a grinding device and a grinding method of the steel saw blade. The invention has the beneficial effects that: has good hardenability and red hardness, long service life, improved grinding efficiency and reduced labor intensity of workers.)

1. A steel saw blade, characterized in that: the material consists of the following components in percentage by mass: 0.55-0.75% of C, 0.1-0.4% of Si, 0.3-0.6% of Mn, 0-0.01% of S, 0-0.01% of P, 0.4-0.7% of Cr, 0-0.4% of Ni, 0-0.1% of Nb, 0-0.03% of Al and the balance of steel.

2. The steel saw blade production apparatus according to claim 1, wherein: which comprises a six-freedom-degree robot (1), a grinding device (2) and a turn-over device (3) which are arranged from left to right in sequence, the polishing device (2) comprises a lifting oil cylinder (4) fixedly arranged on the ground, a lifting plate (5) is fixedly arranged on the action end of a piston rod of the lifting oil cylinder (4), a feeding oil cylinder (6) is fixedly arranged on the top surface of the lifting plate (5), a mounting seat (7) is fixedly arranged on the action end of the piston rod of the feeding oil cylinder (6), a motor A (8) which is horizontally arranged is fixedly arranged on the top surface of the mounting seat (7), a grinding wheel (9) is arranged on an output shaft of the motor A (8), the polishing device further comprises a hydraulic motor (10) arranged on the right side of the lifting oil cylinder (4), a magnetic force table (11) is mounted on an output shaft of the hydraulic motor (10), an electromagnet is arranged in the magnetic force table (11), and the top surface of the electromagnet is flush with the top surface of the magnetic force table (11);

an output shaft of the six-degree-of-freedom robot is fixedly provided with a mounting plate (12), and the bottom surface of the mounting plate (12) is provided with a plurality of electromagnets A (13) along the length direction;

the turnover device (3) comprises a platform (14) and side guard plates (15) fixedly arranged on the front edge and the rear edge of the platform (14), a rotating shaft (16) is rotatably arranged between the two side guard plates (15), a rotating plate (17) positioned on the right side of the rotating shaft (16) is fixedly arranged on the rotating shaft (16), two support plates (18) are fixedly arranged at the other ends of the rotating plate (17), guide posts (19) are fixedly arranged on the top surfaces of the two support plates (18), an electromagnet B (20) is arranged between the two guide posts (19), two guide holes are formed in the bottom surface of the electromagnet B (20), the two guide holes in the electromagnet B (20) are respectively sleeved on the two guide posts (19), a spring (21) is sleeved on each guide post (19), one end of the spring (21) is fixedly arranged on each support plate (18), the other end of the spring is fixedly arranged on the electromagnet B (20), a power unit is fixedly arranged on the outer wall of the side guard plate (15) on the rear side, the output shaft of the power unit is connected with one end of the rotating shaft (16).

3. The steel saw blade production apparatus according to claim 2, wherein: the power unit comprises a speed reducer (22) and a motor B (23), wherein the speed reducer (22) is fixedly arranged on the side guard plate (15), an output shaft of the speed reducer (22) is connected with the rotating shaft (16) through a coupler, the motor B (23) is fixedly arranged on the speed reducer (22), and an output shaft of the motor B (23) is connected with an input shaft of the speed reducer (22) through a coupler.

4. The steel saw blade production apparatus according to claim 2, wherein: the bottom of the platform (14) is provided with a plurality of supporting legs supported on the ground.

5. The steel saw blade production apparatus according to claim 2, wherein: the robot system further comprises a controller, and the controller is electrically connected with the six-degree-of-freedom robot (1), the motor A (8), the motor B (23), the electromagnetic valve of the lifting oil cylinder (4) and the electromagnetic valve of the feeding oil cylinder (6).

6. A process for producing a steel saw blade according to any one of claims 2 to 5, wherein: it comprises the following steps:

s1, controlling the six-degree-of-freedom robot (1) to act through the controller, enabling each electromagnet A (13) to be pressed on the top surface of the steel saw blade placed on the table top of the workbench, then electrifying each electromagnet A (13), and enabling the electromagnet A (13) to adsorb the steel saw blade (24);

s2, controlling the six-degree-of-freedom robot (1) to continue to act, enabling the adsorbed steel saw blade (24) to be transferred to the top surface of the magnetic table (11), powering off the electromagnet A (13) after the adsorbed steel saw blade is in place, and then controlling the six-degree-of-freedom robot to drive the mounting plate (12) to reset;

s3, electrifying the electromagnet on the magnetic table (11), and adsorbing the steel saw blade (24) on the magnetic table (11) by the electromagnet to realize the fixture fixation of the steel saw blade;

s4, grinding the single side of the steel saw blade, and the concrete operation steps are as follows:

s41, controlling the hydraulic motor (10) to act, driving the magnetic force table (11) to rotate around the axis of the hydraulic motor (10), and driving the steel saw blade (24) to synchronously rotate by the magnetic force table (11); controlling a motor A (8) to start, and driving a grinding wheel (9) to rotate by the motor A (8);

s42, controlling a piston rod of the lifting oil cylinder (4) to retract, driving the lifting plate (5) to move downwards by the piston rod, driving the feeding oil cylinder (6) to move downwards by the lifting plate (5), immediately closing the lifting oil cylinder (4) by a worker after the worker observes that the bottom surface of the grinding wheel (9) is contacted with the top surface of the steel saw blade (24), then controlling the piston rod of the feeding oil cylinder (6) to extend, driving the grinding wheel (9) to move along the radial direction of the steel saw blade (24) by the piston rod, grinding the steel saw blade (24) by the grinding wheel (9) in the moving process, and finishing the grinding of the single side of the steel saw blade when the grinding wheel (9) moves to the center of the steel saw blade (24);

s5, after polishing, turning off the motor A (8) and the hydraulic motor (10); the electromagnet on the magnetic table (11) is powered off; controlling the lifting oil cylinder (4) and the feeding oil cylinder (6) to reset; a worker controls a six-degree-of-freedom robot (1) to transfer the steel saw blade (24) ground on the magnetic table (11) to the top surfaces of two electromagnets B (20);

s6, powering off the electromagnet B (20) and controlling the six-degree-of-freedom robot (1) to reset; when the steel saw blade (24) is kept still, the steel saw blade (24) is completely attached to the electromagnets B (20), then the two electromagnets B (20) are electrified, and the steel saw blade (24) is adsorbed by the electromagnets B (20);

s7, a worker turns on a motor B (23), the torque of the motor B (23) is transmitted to a rotating shaft (16) after being reduced by a speed reducer (22), the rotating shaft (16) drives a rotating plate (17) to rotate anticlockwise, the rotating plate (17) drives a supporting plate (18) to rotate, the supporting plate (18) drives an adsorbed steel saw blade (24) to rotate, after the rotating plate (17) rotates for a certain angle, the polished surface of the steel saw blade (24) is attached to the top surface of a magnetic table (11), so that the face turning operation of the steel saw blade is realized, the polishing process is repeated, and the other surface of the steel saw blade can be polished.

Technical Field

The invention relates to a steel saw blade and a production device and a production process thereof.

Background

The steel saw blade is used for cutting metal, and after the steel saw blade works for a period of time for a long time, a large amount of heat is generated on the steel saw blade, and the steel saw blade is easy to be heated, deformed and invalid when being cut at high temperature, so that the service life is short.

The process requires that two surfaces of the steel saw blade are polished to remove redundant materials on the two surfaces of the steel saw blade, so that a finished steel saw blade is produced. The working mode of polishing two sides of the existing steel saw blade is as follows: controlling a sucker on an executing mechanism of a six-degree-of-freedom robot to adsorb a steel saw blade to be polished, after adsorption, transferring the adsorbed steel saw blade to a magnetic table of a polishing device by the six-degree-of-freedom robot, after the six-degree-of-freedom robot is in place, controlling the sucker of the six-degree-of-freedom robot to be disconnected by a worker, switching on an electromagnet on the magnetic table after the sucker of the six-degree-of-freedom robot is disconnected, adsorbing the steel saw blade by the electromagnet on the magnetic table, then controlling the sucker of the six-degree-of-freedom robot to reset, after resetting, opening a hydraulic motor of the polishing device by the worker, driving the magnetic table to do rotary motion by the hydraulic motor, driving the steel saw blade adsorbed on the magnetic table to do rotary motion by the magnetic table, controlling a piston rod of a hydraulic oil cylinder of the polishing device to move downwards by the worker, driving an abrasive wheel to move downwards by the piston rod, and immediately controlling the piston rod of the hydraulic oil cylinder to reset after the worker observes that the bottom surface of the abrasive wheel is contacted with the top surface of the steel saw blade, the piston rod drives the emery wheel and resets, can realize polishing the top surface of saw blade, and after the top surface of saw blade was polished, the workman closed hydraulic motor, and after the magnetic force platform stopped rotating, the workman was cut off the power supply for the electro-magnet after, the workman overturns the saw blade 180 degrees, and the fixed saw blade of frock again can be polished the another side of saw blade to finally realized polishing the two-sided of saw blade. However, although this method can grind both surfaces of the steel saw blade, when the diameter of the steel saw blade is much larger than that of the grinding wheel, it cannot grind a steel saw blade having a large size. In addition, the steel saw blade is heavy and large in size, and usually a plurality of workers are required to participate in the turnover operation at the same time, so that the working strength of the workers is increased undoubtedly, the grinding time of the steel saw blade is delayed, and the grinding efficiency of the steel saw blade is reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a steel saw blade, a production device and a production process thereof, wherein the steel saw blade has good hardenability and red hardness, is long in service life, improves grinding efficiency and reduces labor intensity of workers.

The purpose of the invention is realized by the following technical scheme: a steel saw blade is composed of the following components in percentage by mass: 0.55-0.75% of C, 0.1-0.4% of Si, 0.3-0.6% of Mn, 0-0.01% of S, 0-0.01% of P, 0.4-0.7% of Cr, 0-0.4% of Ni, 0-0.1% of Nb, 0-0.03% of Al and the balance of steel.

The production device of the steel saw blade comprises a six-degree-of-freedom robot, a polishing device and a turnover device which are sequentially arranged from left to right, wherein the polishing device comprises a lifting oil cylinder fixedly arranged on the ground, a lifting plate is fixedly arranged on the action end of a piston rod of the lifting oil cylinder, a feeding oil cylinder is fixedly arranged on the top surface of the lifting plate, a mounting seat is fixedly arranged on the action end of the piston rod of the feeding oil cylinder, a horizontally arranged motor A is fixedly arranged on the top surface of the mounting seat, a grinding wheel is arranged on an output shaft of the motor A, the polishing device further comprises a hydraulic motor arranged on the right side of the lifting oil cylinder, a magnetic table is arranged on the output shaft of the hydraulic motor, an electromagnet is arranged in the magnetic table, and the top surface of the electromagnet is flush with the top surface of the magnetic table;

the output shaft of the six-degree-of-freedom robot is fixedly provided with a mounting plate, and the bottom surface of the mounting plate is provided with a plurality of electromagnets A along the length direction;

the turn-over device includes the platform, set firmly the side guard plate on the edge around the platform, rotatory installation has the pivot between two side guard plates, the rotor plate that is located the pivot right side has set firmly in the pivot, the other end of rotor plate has set firmly two extension boards, the guide post has all set firmly on the top surface of two extension boards, be provided with electro-magnet B between two guide posts, two guiding holes have been seted up on electro-magnet B's the basal surface, two guiding holes on the electro-magnet B overlap respectively and locate two guide posts, the cover is equipped with the spring on the guide post, the one end of spring sets firmly on the extension board, the other end sets firmly on electro-magnet B, the power pack has set firmly on the outer wall of the side guard plate of rear side, the output shaft of power pack is connected with the one end of pivot.

The power unit comprises a speed reducer and a motor B, the speed reducer is fixedly arranged on the side guard plate, an output shaft of the speed reducer is connected with the rotating shaft through a coupler, the motor B is fixedly arranged on the speed reducer, and an output shaft of the motor B is connected with an input shaft of the speed reducer through a coupler.

The bottom of the platform is provided with a plurality of supporting legs supported on the ground.

The robot with six degrees of freedom further comprises a controller, wherein the controller is electrically connected with the six-degree of freedom robot, the motor A, the motor B, the electromagnetic valve of the lifting oil cylinder and the electromagnetic valve of the feeding oil cylinder.

The process for producing the steel saw blade by the device comprises the following steps:

s1, controlling the six-degree-of-freedom robot to act through the controller, enabling each electromagnet A to be pressed on the top surface of the steel saw blade placed on the table top of the workbench, and then electrifying each electromagnet A, wherein the electromagnet A adsorbs the steel saw blade;

s2, controlling the six-degree-of-freedom robot to continue to act, enabling the adsorbed steel saw blade to be transferred to the top surface of the magnetic force table, powering off the electromagnet A after the adsorbed steel saw blade is in place, and then controlling the six-degree-of-freedom robot to drive the mounting plate to reset;

s3, electrifying the electromagnet on the magnetic table, and adsorbing the steel saw blade on the magnetic table by the electromagnet to realize the fixture fixation of the steel saw blade;

s4, grinding the single side of the steel saw blade, and the concrete operation steps are as follows:

s41, controlling the hydraulic motor to act, driving the magnetic force table to rotate around the axis of the hydraulic motor, and driving the steel saw blade to synchronously rotate by the magnetic force table; controlling a motor A to start, and driving a grinding wheel to rotate by the motor A;

s42, controlling a piston rod of a lifting oil cylinder to retract, driving the lifting plate to move downwards by the piston rod, driving a feeding oil cylinder to move downwards by the lifting plate, immediately closing the lifting oil cylinder by a worker after the worker observes that the bottom surface of a grinding wheel is contacted with the top surface of the steel saw blade, then controlling the piston rod of the feeding oil cylinder to extend out, driving the grinding wheel to move along the radial direction of the steel saw blade by the piston rod, grinding the steel saw blade by the grinding wheel in the moving process, and finishing the single-side grinding of the steel saw blade when the grinding wheel moves to the center of the steel saw blade;

s5, after polishing, turning off the motor A and the hydraulic motor; powering off an electromagnet on the magnetic table; controlling the lifting oil cylinder and the feeding oil cylinder to reset; a worker controls a six-degree-of-freedom robot to transfer the steel saw blade ground on the magnetic table to the top surfaces of two electromagnets B;

s6, powering off the electromagnet B, and controlling the six-degree-of-freedom robot to reset; when the steel saw blade is kept still, the steel saw blade is completely attached to the electromagnets B, then the two electromagnets B are electrified, and the steel saw blade is adsorbed by the electromagnets B;

s7, a worker turns on the motor B, the torque of the motor B is transmitted to the rotating shaft after being reduced by the speed reducer, the rotating shaft drives the rotating plate to rotate anticlockwise, the rotating plate drives the supporting plate to rotate, the supporting plate drives the adsorbed steel saw blade to rotate, and after the rotating plate rotates for a certain angle, the polished surface of the steel saw blade is attached to the top surface of the magnetic table, so that the steel saw blade is turned over, the polishing process is repeated, and the other surface of the steel saw blade can be polished.

The invention has the following advantages: the invention has good hardenability and red hardness, long service life, improved grinding efficiency and reduced labor intensity.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the six degree-of-freedom robot of FIG. 1 with the six degrees of freedom removed;

FIG. 3 is a cross-sectional view B-B of FIG. 2;

FIG. 4 is a schematic view of the electromagnet B adsorbing the steel saw blade;

in the figure, 1-six-degree-of-freedom robot, 2-grinding device, 3-turnover device, 4-lifting cylinder, 5-lifting plate, 6-feeding cylinder, 7-mounting seat, 8-motor A, 9-grinding wheel, 10-hydraulic motor, 11-magnetic table, 12-mounting plate, 13-electromagnet A, 14-platform, 15-side guard plate, 16-rotating shaft, 17-rotating plate, 18-supporting plate, 19-guiding column, 20-electromagnet B, 21-spring, 22-speed reducer, 23-motor B, 24-steel saw blade.

Detailed Description

The invention will be further described with reference to the accompanying drawings, without limiting the scope of the invention to the following:

a steel saw blade is composed of the following components in percentage by mass: 0.55-0.75% of C, 0.1-0.4% of Si, 0.3-0.6% of Mn, 0-0.01% of S, 0-0.01% of P, 0.4-0.7% of Cr, 0-0.4% of Ni, 0-0.1% of Nb, 0-0.03% of Al and the balance of steel. The steel saw blade produced by the formula can improve the hardenability, the plastic toughness and the red hardness of the material; therefore, when the steel plate is cut at high temperature, the rigidity and the hardness of the steel plate can be still kept, and the cutting precision is ensured, so that the service life of the steel saw blade is greatly prolonged.

As shown in fig. 1 to 3, the steel saw blade production device comprises a six-degree-of-freedom robot 1, a grinding device 2 and a turnover device 3 which are sequentially arranged from left to right, wherein the grinding device 2 comprises a lifting cylinder 4 fixedly arranged on the ground, a lifting plate 5 is fixedly arranged on an action end of a piston rod of the lifting cylinder 4, a feed cylinder 6 is fixedly arranged on the top surface of the lifting plate 5, an installation seat 7 is fixedly arranged on an action end of a piston rod of the feed cylinder 6, a horizontally arranged motor A8 is fixedly arranged on the top surface of the installation seat 7, a grinding wheel 9 is arranged on an output shaft of a motor A8, the grinding device further comprises a hydraulic motor 10 arranged on the right side of the lifting cylinder 4, a magnetic table 11 is arranged on an output shaft of the hydraulic motor 10, an electromagnet is arranged in the magnetic table 11, and the top surface of the electromagnet is; the output shaft of the six-degree-of-freedom robot is fixedly provided with a mounting plate 12, and the bottom surface of the mounting plate 12 is provided with a plurality of electromagnets A13 along the length direction;

the turn-over device 3 comprises a platform 14, side guard plates 15 fixedly arranged on the front edge and the rear edge of the platform 14, a rotating shaft 16 is rotatably arranged between the two side guard plates 15, a rotating plate 17 positioned on the right side of the rotating shaft 16 is fixedly arranged on the rotating shaft 16, two support plates 18 are fixedly arranged at the other ends of the rotating plate 17, guide posts 19 are fixedly arranged on the top surfaces of the two support plates 18, an electromagnet B20 is arranged between the two guide posts 19, two guide holes are formed in the bottom surface of an electromagnet B20, the two guide holes in the electromagnet B20 are respectively sleeved on the two guide posts 19, a spring 21 is sleeved on the guide posts 19, one end of the spring 21 is fixedly arranged on the support plate 18, the other end of the spring is fixedly arranged on the electromagnet B20, a power unit is fixedly arranged on the outer wall of the side guard plate 15 on the rear side, and an output shaft of the power unit is connected with one end of the rotating shaft 16.

The power unit comprises a speed reducer 22 and a motor B23, wherein the speed reducer 22 is fixedly arranged on the side guard plate 15, an output shaft of the speed reducer 22 is connected with the rotating shaft 16 through a coupler, the motor B23 is fixedly arranged on the speed reducer 22, and an output shaft of the motor B23 is connected with an input shaft of the speed reducer 22 through a coupler. The bottom of the platform 14 is provided with a plurality of support legs that are supported on the ground.

The robot with six degrees of freedom further comprises a controller, wherein the controller is electrically connected with the six-degree of freedom robot 1, the motor A8, the motor B23, the electromagnetic valve of the lifting oil cylinder 4 and the electromagnetic valve of the feeding oil cylinder 6, the motor A8 and the motor B23 can be controlled to be started or closed through the controller, and meanwhile, the lifting oil cylinder 4 and the feeding oil cylinder 6 can be controlled to extend or retract.

The process for producing the steel saw blade by the device comprises the following steps:

s1, controlling the six-degree-of-freedom robot 1 to act through the controller, enabling each electromagnet A13 to be pressed on the top surface of the steel saw blade placed on the table top of the workbench, then electrifying each electromagnet A13, and enabling the electromagnet A13 to adsorb the steel saw blade 24;

s2, controlling the six-degree-of-freedom robot 1 to continue to act, enabling the adsorbed steel saw blade 24 to be transferred to the top surface of the magnetic table 11, switching off the electromagnet A13 after the steel saw blade is in place, and then controlling the six-degree-of-freedom robot to drive the mounting plate 12 to reset;

s3, electrifying the electromagnet on the magnetic table 11, and adsorbing the steel saw blade 24 on the magnetic table 11 by the electromagnet to realize the fixture fixation of the steel saw blade;

s4, grinding the single side of the steel saw blade, and the concrete operation steps are as follows:

s41, controlling the hydraulic motor 10 to act, wherein the hydraulic motor 10 drives the magnetic force table 11 to rotate around the axis of the hydraulic motor 10, and the magnetic force table 11 drives the steel saw blade 24 to synchronously rotate; controlling a motor A8 to start, and driving a grinding wheel 9 to rotate by a motor A8;

s42, controlling the piston rod of the lifting oil cylinder 4 to retract, driving the lifting plate 5 to move downwards by the piston rod, driving the feeding oil cylinder 6 to move downwards by the lifting plate 5, immediately closing the lifting oil cylinder 4 by a worker after the worker observes that the bottom surface of the grinding wheel 9 is contacted with the top surface of the steel saw blade 24, then controlling the piston rod of the feeding oil cylinder 6 to extend out, driving the grinding wheel 9 to move along the radial direction of the steel saw blade 24 by the piston rod, grinding the steel saw blade 24 by the grinding wheel 9 in the moving process, and finishing the grinding of the single surface of the steel saw blade when the grinding wheel 9 moves to the center of the steel saw blade 24; because the grinding wheel is used for grinding along the radial direction of the steel saw blade 24, and the steel saw blade 24 is in a rotating state, the device can be used for grinding the large-size cylinder saw blade, the defect that the large-size steel saw blade cannot be ground due to the limitation of the size of the grinding wheel in the conventional grinding device is overcome, and the device has the characteristic of high universality.

S5, after polishing, closing the motor A8 and the hydraulic motor 10; the electromagnet on the magnetic table 11 is powered off; controlling the lifting oil cylinder 4 and the feeding oil cylinder 6 to reset; the worker controls the six-degree-of-freedom robot 1 to transfer the steel saw blade 24 ground on the magnetic table 11 to the top surfaces of the two electromagnets B20 as shown in fig. 4;

s6, powering off the electromagnet B20, and controlling the six-degree-of-freedom robot 1 to reset; when the steel saw blade 24 is kept still, the steel saw blade 24 is completely attached to the electromagnet B20, then the two electromagnets B20 are electrified, and the electromagnet B20 adsorbs the steel saw blade 24;

s7, a worker turns on a motor B23, the torque of the motor B23 is reduced by a speed reducer 22 and then transmitted to the rotating shaft 16, the rotating shaft 16 drives the rotating plate 17 to rotate anticlockwise, the rotating plate 17 drives the supporting plate 18 to rotate, the supporting plate 18 drives the adsorbed steel saw blade 24 to rotate, and after the rotating plate rotates for a certain angle, the polished surface of the steel saw blade 24 is attached to the top surface of the magnetic table 11, so that the steel saw blade is turned over, the polishing process is repeated, and the other surface of the steel saw blade can be polished.

Therefore, in the whole process of loading and unloading and turning over the steel saw blade 24, a plurality of workers are not needed to carry out loading and unloading and turning over operations on the steel saw blade with large size, and the working strength of the workers is greatly saved. In addition, the time consumed by turnover is obviously shortened, and the polishing efficiency of the steel saw blade is greatly improved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.