阅读说明：本技术 一种分度式电解加工装置 (Indexing type electrolytic machining device ) 是由 徐波 王顺心 郭魂 何亚峰 吴小峰 江炜 于 2021-08-12 设计创作，主要内容包括：本发明提供了一种分度式电解加工装置,包括机座、运动单元、分度单元和动力单元,运动单元、分度单元和动力单元均设置在机座上,动力单元通过驱动带驱动运动单元和分度单元,解决了现有电解加工装置容易导致环切吻合器钉座上凸台或凹坑一致性较差的问题,采用分度电解加工方式,使得环切吻合器钉座具有较高的精度,且极大提高了环切吻合器钉座上凸台或凹坑的一致性。(The invention provides an indexing type electrolytic machining device which comprises a machine base, a moving unit, an indexing unit and a power unit, wherein the moving unit, the indexing unit and the power unit are all arranged on the machine base, and the power unit drives the moving unit and the indexing unit through a driving belt, so that the problem that bosses or pits on a nail seat of a circular cutting anastomat are poor in consistency easily caused by the conventional electrolytic machining device is solved.)

1. An indexing type electrolytic processing device, comprising:

the device comprises a base (1), wherein a first working platform (11) and a second working platform (12) are formed on the base (1), a first through hole (111) is formed in the first working platform (11), a second through hole (121) is formed in the second working platform (12), and the first through hole (111) and the second through hole (121) are opposite in position;

a movement unit (2), the movement unit (2) comprising:

the vibration unit comprises a vibration shaft (21), wherein a first end of the vibration shaft (21) is connected with the power unit (4) through a synchronous belt, a fixed column (211) is formed at the second end of the vibration shaft (21) in the direction perpendicular to the axial direction, and a shifting lever (212) parallel to the axial direction is formed on the fixed column (211);

the cam (22), the said cam (22) is fixed on cam support (23), there are arc grooves (221) that are matched with said driving lever (212) on the said cam (22), the said driving lever (212) moves along the arc groove (221);

the cam bracket (23), the said cam bracket (23) is fixed to said first work platform (11);

the spline shaft (24) moves in the vertical direction along a spline shaft sleeve (25) relative to the first working platform, a first rectangular groove (241) is formed in the top end of the spline shaft (24), and a cathode tool (25) is fixed at the tail end of the spline shaft (24);

the upper fixing plate (26) vertically moves between the first working platform (11) and the second working platform (12) relative to the guide column (27), a pair of diagonal positions of the upper fixing plate (26) are provided with sinking steps (261) for fixing the air cylinder (29), the end face, facing the second working platform (12), of the upper fixing plate (26) is provided with a second rectangular groove (262) and a third rectangular groove (263) which are communicated with the inside, and the symmetrical side faces of the upper fixing plate (26) along the length direction are respectively provided with a water inlet (264) and a water outlet (265);

the flow field tooling plate (28) is fixedly connected with the upper fixing plate (26), a third through hole (281) is formed in the center of the flow field tooling plate (28), and a rectangular runner (282) and a trapezoidal runner (283) are arranged in the radial direction of the third through hole (281);

an indexing unit (3) comprising:

the lower fixing plate (31), the said lower fixing plate (31) is fixedly mounted on second work platform (12);

the workpiece fixing shaft (32), the workpiece fixing shaft (32) is nested in the through hole of the lower fixing plate (31) and is used for fixing the nail seat to be processed;

one end of the hemispherical dividing head (33) is fixedly connected with the tail end of the workpiece fixing shaft (32), the other end of the hemispherical dividing head (33) is hemispherical and consists of a plurality of uniformly distributed hemispherical rings (331), a semicircular groove (332) is formed in the top of each hemispherical ring (331), and a U-shaped groove (333) is formed between every two adjacent hemispherical rings (331);

one end of the spherical indexing shaft (34) is connected with the power unit (4) through a synchronous belt, a spherical ring (341) is formed at the other end of the spherical indexing shaft (34), a positioning column (342) is arranged at the center of the spherical ring (341), the positioning column (342) is matched with the semicircular groove (332), a cylindrical pull pin (343) is arranged at the edge of the spherical ring (341), and the pull pin (343) is matched with a U-shaped groove between the semicircular ring (331);

power pack (4), power pack (4) are fixed in on first work platform (11), power pack (4) include motor (41) for through the hold-in range drive motion unit (2) and indexing unit (3).

2. An indexing electrolytic machining device according to claim 1, characterized in that the cathode tool (25) has a cathode head (251) formed on its end face facing the second work platform (12), the cathode head (251) having a groove or a projection adapted to the nail seat to be machined.

3. The indexing type electrolytic processing device according to claim 1, wherein the upper fixing plate (26) is made of a non-conductive material.

4. An indexing electrolytic processing apparatus as claimed in claim 1, wherein said flow field tooling plate (28) is made of a non-conductive material.

5. The indexing type electrolytic machining device according to claim 2, wherein the cathode head (251) is fan-shaped, and the arc of the fan-shaped cathode head (251) is identical to the arc of the top of the trapezoidal flow channel (283) on the flow field tooling plate (28).

6. The indexing type electrolytic processing device according to claim 1, wherein a sealing ring is provided on the lower fixing plate (31).

7. The indexing type electrolytic processing device according to claim 1, wherein the positioning column (342) is one third of the volume of the complete cylinder.

8. An indexing type electrolytic machining apparatus according to claim 1, wherein the cylinder body seat of the air cylinder (29) is fixedly connected to the first work platform (11), and the piston rod of the air cylinder (29) is connected to the upper fixing plate (26).

Technical Field

The invention relates to the technical field of electrolytic machining, in particular to an indexing type electrolytic machining device.

Background

The surface of the nail seat of the circular cutting anastomat is provided with the regularly arranged small bosses or pits, the structure is shown in figure 1, in order to realize high-efficiency and high-precision processing, an electrolytic processing mode is preferred, but when a workpiece with a large area is processed by a traditional electrolytic processing device, the machined bosses or pits of the nail seat of the circular cutting anastomat are poor in consistency due to the fact that the temperature of electrolyte is changed, the distribution of electrolytic processing products in the electrolyte is uneven and the conductivity of the electrolyte is uneven.

Disclosure of Invention

The indexing type electrolytic machining device disclosed by the invention solves the problem that the consistency of bosses or pits on the nail seat of the circular cutting anastomat is poor easily caused by the existing electrolytic machining device, and the nail seat of the circular cutting anastomat has higher precision by adopting an indexing electrolytic machining mode, and the consistency of the bosses or the pits on the nail seat of the circular cutting anastomat is greatly improved.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention discloses an indexing type electrolytic machining device which comprises a machine base, a moving unit, an indexing unit and a power unit, wherein the machine base is provided with a first working platform and a second working platform, the first working platform is provided with a first through hole, the second working platform is provided with a second through hole, and the first through hole and the second through hole are opposite in position; the motion unit comprises a vibration shaft, a cam bracket, a spline shaft, an upper fixing plate and a flow field tooling plate, wherein the first end of the vibration shaft is connected with the power unit through a synchronous belt, a fixing column is formed at the second end of the vibration shaft in the direction vertical to the axial direction, and a deflector rod parallel to the axial direction is formed on the fixing column; the cam is fixed on the cam bracket, an arc groove matched with the deflector rod is formed on the cam, and the deflector rod moves along the arc groove; the cam bracket is fixed on the first working platform; the spline shaft moves along the spline shaft sleeve in the vertical direction relative to the first working platform, a first rectangular groove is formed in the top end of the spline shaft, and a cathode tool is fixed at the tail end of the spline shaft; the upper fixing plate vertically moves between the first working platform and the second working platform relative to the guide column, a pair of diagonal positions of the upper fixing plate are provided with sunken steps for fixing the air cylinder, the end surface of the upper fixing plate facing the second working platform is provided with a second rectangular groove and a third rectangular groove communicated with the inside, and the symmetrical side surfaces of the upper fixing plate along the length direction are respectively provided with a water inlet and a water outlet; the flow field tooling plate is fixedly connected with the upper fixing plate, a third through hole is formed in the center of the flow field tooling plate, and a rectangular flow channel and a trapezoidal flow channel are formed in the radial direction of the third through hole; the indexing unit comprises a lower fixing plate, a workpiece fixing shaft, a hemispherical indexing head and a spherical indexing shaft, wherein the lower fixing plate is fixedly arranged on the second working platform; the workpiece fixing shaft is nested in the through hole of the lower fixing plate and used for fixing a nail seat to be processed; one end of the hemispherical dividing head is fixedly connected with the tail end of the workpiece fixing shaft, the other end of the hemispherical dividing head is hemispherical and consists of a plurality of uniformly distributed hemispherical rings, a semicircular groove is formed in the top of each hemispherical ring, and a U-shaped groove is formed between every two adjacent hemispherical rings; one end of the spherical indexing shaft is connected with a power unit through a synchronous belt, a spherical ring is formed at the other end of the spherical indexing shaft, a positioning column is arranged at the central position of the spherical ring and is matched with the semicircular groove, a cylindrical pull pin is arranged at the edge of the spherical ring, and the pull pin is matched with a U-shaped groove between the semicircular rings; the power unit is fixed on the first working platform and comprises a motor and is used for driving the motion unit and the indexing unit through a synchronous belt.

Furthermore, a cathode head is formed on the end face, facing the second working platform, of the cathode tool, and a groove or a boss matched with the nail seat to be machined is formed in the cathode head.

Further, the upper fixing plate is made of a non-conductive material.

Further, the flow field tooling plate is made of a non-conductive material.

Furthermore, the cathode head is fan-shaped, and the radian of the fan-shaped radian of the cathode head is consistent with the radian of the top of the trapezoidal flow channel on the flow field tooling plate.

Further, a sealing ring is arranged on the lower fixing plate.

Further, the positioning column is one third of the volume of the complete cylinder.

Further, the cylinder body seat of the air cylinder is fixedly connected to the first working platform, and the piston rod of the air cylinder is connected with the upper fixing plate.

The beneficial technical effects are as follows:

1. the invention discloses an indexing type electrolytic machining device which comprises a machine base, a moving unit, an indexing unit and a power unit, wherein the moving unit, the indexing unit and the power unit are all arranged on the machine base, and the power unit drives the moving unit and the indexing unit through a driving belt, so that the problem that bosses or pits on a nail seat of a circular cutting anastomat are poor in consistency easily caused by the conventional electrolytic machining device is solved.

2. In the invention, the cathode head is fan-shaped, and the radian of the fan-shaped cathode head is consistent with the radian of the top of the trapezoidal flow channel on the flow field tooling plate, so that the flow field is concentrated, and the condition of liquid shortage in an electrolytic machining area is effectively prevented.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments will be briefly described below.

FIG. 1 is a schematic structural view of a staple holder of a circular cutting stapler;

FIG. 2 is a schematic view of the overall structure of an indexing type electrolytic processing device according to the present invention;

FIG. 3 is a schematic structural view of a machine base of an indexing type electrolytic machining apparatus according to the present invention;

FIG. 4 is a schematic structural view of a vibration shaft of an indexing type electrolytic processing device according to the present invention;

FIG. 5 is a schematic view of a cam structure of an indexing type electrolytic processing device according to the present invention;

FIG. 6 is a schematic structural view of a cam holder of the indexing-type electrochemical machining apparatus according to the present invention;

FIG. 7 is a schematic structural view of a spline shaft in the indexing type electrolytic processing device according to the present invention;

FIG. 8 is a schematic structural view of a cathode tool in an indexing type electrolytic processing apparatus according to the present invention;

FIG. 9 is a schematic structural view of an upper fixing plate of the indexing type electrolytic processing device according to the present invention;

FIG. 10 is a schematic view showing the structure of the bottom surface of an upper fixing plate in the indexing type electrolytic processing device according to the present invention;

FIG. 11 is a schematic structural view of a flow field tooling plate in an indexing type electrochemical machining apparatus according to the present invention;

FIG. 12 is a schematic structural view of a workpiece fixing shaft of the indexing type electrochemical machining apparatus according to the present invention;

FIG. 13 is a schematic view of a hemispherical index head structure of an index electrochemical machining apparatus according to the present invention;

FIG. 14 is a schematic structural view of a spherical index shaft in the indexing-type electrolytic processing device according to the present invention;

FIG. 15 is a first schematic view of a spherical index shaft and a hemispherical index head of an indexing electrolytic processing apparatus according to the present invention;

FIG. 16 is a sectional view of a spherical index shaft of an indexing electrolytic processing device according to the present invention, in combination with a hemispherical index head;

FIG. 17 is a sectional view showing the flow direction of an electrolyte in the indexing type electrolytic processing device according to the present invention;

FIG. 18 is a sectional view of an indexing type electrolytic processing device according to the present invention in operation;

FIG. 19 is a sectional view of an index type electrolytic processing device according to the present invention after completion of processing.

Wherein, 1-a machine base, 11-a first working platform, 111-a first through hole, 12-a second working platform, 121-a second through hole, 2-a moving unit, 21-a vibrating shaft, 211-a fixed column, 212-a deflector rod, 22-a cam, 221-a circular arc groove, 23-a cam bracket, 24-a spline shaft, 241-a first rectangular groove, 25-a cathode tool, 251-a cathode head, 26-an upper fixed plate, 261-a descending step, 262-a second rectangular groove, 263-a third rectangular groove, 264-a water inlet, 265-a water outlet, 27-a guide column, 28-a flow field tooling plate, 281-a third through hole, 282-a rectangular flow channel, 283-a trapezoidal flow channel, 3-an indexing unit and 31-a lower fixed plate, 32-workpiece fixing shaft, 33-hemispherical dividing head, 331-hemispherical ring, 332-semicircular groove, 333-U-shaped groove, 34-spherical dividing shaft, 341-spherical ring, 342-positioning column, 343-pulling pin, 4-power unit and 41-motor.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The invention discloses an indexing type electrolytic machining device, which is shown in figure 2 and comprises a machine base 1, a moving unit 2, an indexing unit 3 and a power unit 4.

Engine base

Referring to fig. 3, specifically, the base 1 is formed with a first working platform 11 and a second working platform 12, the first working platform 11 is provided with a first through hole 111, the second working platform 12 is provided with a second through hole 121, and the first through hole 111 and the second through hole 121 are opposite in position and used for bearing the moving unit 2, the indexing unit 3 and the power unit 4.

Movement unit

The motion unit 2 comprises a vibration shaft 21, a cam 22, a cam bracket 23, a spline shaft 24, a spline shaft sleeve 25, an upper fixing plate 26 and a flow field tooling plate 28, wherein the vibration shaft 21 is shown in fig. 4, specifically, a first end of the vibration shaft 21 is connected with the power unit 4 through a synchronous belt, a fixing column 211 is formed at a second end of the vibration shaft 21 in a direction perpendicular to the axial direction, and a driving lever 212 parallel to the axial direction is formed on the fixing column 211; the cam 22 is shown in fig. 5, specifically, the cam 22 is fixed on the cam bracket 23, an arc groove 221 matched with the shift lever 212 is formed on the cam 22, the shift lever 212 moves along the arc groove 221, the middle of the cam 22 is similar to a heart shape, two ends of the cam 22 extend out of a guide rod along the radial direction, and the guide rod at one end is connected with a first rectangular groove 241 at the top of the spline shaft 24; cam bracket referring to fig. 6, specifically, the cam bracket 23 is fixed on the first work platform 11, and guide rods at both ends of the cam 22 are inserted into guide grooves on the cam bracket 23 to fix the cam 22; the spline shaft is shown in fig. 7, specifically, the spline shaft 24 moves in the vertical direction relative to the first working platform 11 along the spline shaft sleeve 25, the top end of the spline shaft 24 is provided with a first rectangular groove 241, the first rectangular groove 241 is matched with a guide rod extending from the cam 22 to connect with the cam 22, the tail end of the spline shaft 24 is fixed with a cathode tool 25, the cathode tool 25 is shown in fig. 8, specifically, a cathode head 251 is formed on the end surface of the cathode tool 25 facing the second working platform 12, a groove or a boss matched with a nail seat to be processed is formed on the cathode head 251, and when the nail seat to be processed is a groove, the cathode head formed with the boss is selected; when the nail seat to be processed is provided with the boss, the cathode head with the groove is selected, preferably, the cathode head 251 is fan-shaped, and the radian of the fan-shaped radian is 60 degrees; referring to fig. 9-10, specifically, the upper fixing plate 26 moves vertically between the first working platform 11 and the second working platform 12 relative to the guide post 27, a pair of diagonal positions of the upper fixing plate 26 are provided with a sunken step 261 for fixing the cylinder 29, preferably, a cylinder block seat of the cylinder 29 is fixedly connected to the first working platform 11, a piston rod of the cylinder 29 is connected to the upper fixing plate 26, an end surface of the upper fixing plate 26 facing the second working platform 12 is provided with a second rectangular groove 262 and a third rectangular groove 263 communicated with the inside, symmetrical side surfaces of the upper fixing plate 26 along the length direction are respectively provided with a water inlet 264 and a water outlet 265, preferably, the upper fixing plate 26 is a cube block made of a non-conductive material, and the center thereof is provided with a through hole; referring to fig. 11, in detail, the flow field tooling plate 28 is fixedly connected to the upper fixing plate 26, the center of the flow field tooling plate 28 is provided with a third through hole 281, and a rectangular flow channel 282 and a trapezoidal flow channel 283 are arranged along the radial direction of the third through hole 281, preferably, the flow field tooling plate 28 is made of a non-conductive material, the rectangular flow channel 282 is communicated with the second rectangular groove 262 of the upper fixing plate 26, the trapezoidal flow channel 283 is communicated with the third rectangular groove 263 of the upper fixing plate 26, and the width of the top (upper bottom edge) of the trapezoidal flow channel 283 is consistent with the fan-shaped radian of the cathode head 251, so that the flow field is concentrated, and the liquid shortage condition in the electrochemical machining area is effectively prevented.

The upper fixing plate 26 and the flow field tooling plate 28 are fixed together by screws, and the joint surfaces of the upper fixing plate and the flow field tooling plate are provided with sealant, and the assembly relationship is shown in fig. 17.

It should be noted that the knowledge of rectangular and trapezoidal flow channels herein is illustrative of the general shape of the flow channels and is not intended to limit the flow channels to be mathematically rectangular and trapezoidal.

Indexing unit

The indexing unit comprises a lower fixing plate 31, a workpiece fixing shaft 32, a hemispherical indexing head 33 and a spherical indexing shaft 34, the lower fixing plate 31 is shown in fig. 1, the lower fixing plate 31 is fixedly arranged on the second working platform 12, a through hole is formed in the lower fixing plate 31, and a circular groove is formed in the periphery of the through hole and used for placing a sealing ring; the workpiece fixing shaft 32 referring to fig. 12, specifically, the workpiece fixing shaft 32 is nested in the through hole of the lower fixing plate 31, and the workpiece fixing groove at the top end thereof is used for fixing the nail seat to be processed; referring to fig. 13, specifically, one end of the hemispherical index head 33 is fixedly connected to the end of the workpiece fixing shaft 32, the other end of the hemispherical index head 33 is hemispherical and is composed of a plurality of uniformly distributed hemispherical rings 331, a semicircular groove 332 is formed at the top of each hemispherical ring 331, and a "U" -shaped groove 333 is formed between adjacent hemispherical rings 331, and preferably, the hemispherical index head 33 is composed of 6 uniformly distributed hemispherical rings; referring to fig. 14, specifically, one end of the spherical indexing shaft 34 is connected to the power unit 4 through a synchronous belt, a spherical ring 341 is formed at the other end of the spherical indexing shaft 34, a positioning column 342 is disposed at a central position of the spherical ring 341, the positioning column 342 is adapted to the semicircular groove 332, and preferably, the positioning column 342 is one third of the volume of the complete cylinder; the edge of the spherical ring 341 is provided with a cylindrical pin 343, and the pin 343 is matched with the U-shaped groove between the hemispherical rings 331.

As an embodiment of the present invention, referring to fig. 15-16, the center of rotation of the spherical indexing shaft 34 is perpendicular to the center of rotation of the hemispherical indexing head 33 (the included angle is 90 degrees), the inner spherical surface of the spherical indexing shaft 34 fits the outer spherical surface of the hemispherical indexing head 33, the positioning posts 342 of the spherical indexing shaft 34 can fit the semicircular grooves 332 of the hemispherical indexing head 33, and the toggle pins 343 can fit the U-shaped grooves 333. When the spherical indexing shaft 34 rotates at a certain speed, the outer cylindrical surface of the positioning column 342 is engaged with the semicircular groove 332, the hemispherical indexing head 33 remains stationary (does not rotate), when the outer cylindrical surface of the positioning column 342 rotates out of the semicircular groove 332, the pin 343 enters the U-shaped groove 333 to drive the hemispherical indexing head 33 to rotate, when the pin 343 is separated from the U-shaped groove 332, the outer cylindrical surface of the positioning column 342 enters the semicircular groove 332 to stop the rotation of the hemispherical indexing head 33, so that when the spherical indexing shaft 34 rotates at a certain speed, the hemispherical indexing head 33 is in a cyclic action of rotation-stop-rotation-stop.

Power unit

The power unit 4 is fixed to the first work platform 11, and the power unit 4 includes a motor 41 for driving the movement unit 2 and the index unit 3 through a timing belt.

The working principle of the indexing type electrolytic machining device disclosed by the invention is as follows:

the cylinder 29 drives the upper fixing plate 26 and the flow field tooling plate 28 to move up and down, the power mechanism 4 drives the workpiece to rotate through the spherical indexing shaft 34, the power mechanism 4 drives the spline shaft 24 to drive the cathode tool 25 to move up and down through the vibration shaft 21, and the motor 41 drives the vibration shaft 24 and the spherical indexing shaft 34 through the synchronous belt to synchronously and coordinately move.

When the workpiece is fixed in the workpiece fixing groove at the top end of the workpiece fixing shaft 32, the cylinder 29 pushes the upper fixing plate 26 to move downwards along the guide post 27 and to be attached to the lower fixing plate 31, the flow field is closed, referring to fig. 18, the electric motor 41 drives the moving unit and the indexing unit to move, wherein the shift lever 212 on the vibrating shaft 21 moves from the groove to the arc groove, the cam 22 moves downwards along the arc groove 221, and simultaneously drives the spline shaft 24 and the cathode tool 25 to move to a lower working point, the positioning post 342 of the spherical indexing shaft 34 starts to enter the half groove 332, so that the nail seat to be processed enters a relatively static state, at this time, the gap between the cathode tool 25 and the nail seat to be processed is minimum, an electrolytic pump (not shown) of the electrolytic processing system is opened, electrolyte with a certain flow rate is provided to the electrolyte flow channel, and a power supply (not shown) for electrolytic processing supplies power to the cathode tool 25 and the nail seat to be processed, the sector part of the nail seat to be processed, which is opposite to the cathode head 251, starts to be processed, when the deflector rod 212 enters the groove again, the cam 22, the spline shaft 24 and the cathode tool 25 are lifted to the upper working point, the power supply is cut off, the deflector pin 343 of the spherical dividing shaft 34 enters the U-shaped groove 333, the hemispherical dividing head 33, the workpiece fixing shaft 32 and the nail seat to be processed are driven to rotate by a certain angle (60 degrees), when the deflector rod 212 enters the circular arc groove again, the cathode tool 25 is sent to the lower working point and kept stationary for a certain time, the positioning column 342 of the spherical dividing shaft 34 enters the semicircular groove 332 again, the nail seat to be processed is kept stationary for a certain time, the power supply is turned on again, the second sector starts to be processed, the process is repeated until the sixth sector is processed, namely the whole nail seat to be processed is processed, referring to fig. 19, the motor stops operating, the electrolyte supply stops, the processing power supply stops, the cylinder 29 drives the upper fixing plate 26 to move upwards, the workpiece can be replaced to prepare for the next processing.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.