阅读说明：本技术 一种用于海洋钻探的可收缩式钻头及钻具设备 (Retractable drill bit and drilling tool equipment for ocean drilling ) 是由 李星辰 许振强 谢文卫 熊亮 寇贝贝 余秋平 于浩雨 曾静 李晶 李彬 王英圣 于 2021-08-25 设计创作，主要内容包括：本发明公开了一种用于海洋钻探的可收缩式钻头及钻具设备,其中,该钻头包括钻头胎体、设置于钻头胎体第一端用于连接岩芯管的连接部、设置于钻头胎体中心贯穿该钻头胎体并可与该岩芯管连通的中心孔、设置于该钻头胎体侧壁上贯穿该钻头胎体侧壁并与该中心孔连通的安装腔、可转动设置于该安装腔内的收缩块、以及设置于该安装腔并用于推动该收缩块伸出该钻头胎体侧壁外的弹性件。使用时,可将岩芯管与钻头通过连接部进行连接,然后将钻头和岩芯管一起下入钻杆内,此时收缩块被挤压缩回至钻头胎体内,弹性件处于弹性形变状态,直至钻头由钻杆端部伸出,钻杆内壁不再挤压收缩块,弹性件在自身弹性恢复力作用下向外推动该收缩块伸出该钻头胎体侧壁外。(The invention discloses a retractable drill bit and drilling tool equipment for ocean drilling, wherein the drill bit comprises a drill bit matrix, a connecting part arranged at the first end of the drill bit matrix and used for connecting a rock core pipe, a central hole arranged in the center of the drill bit matrix, penetrating through the drill bit matrix and capable of being communicated with the rock core pipe, a mounting cavity arranged on the side wall of the drill bit matrix, penetrating through the side wall of the drill bit matrix and communicated with the central hole, a shrinkage block rotatably arranged in the mounting cavity, and an elastic piece arranged in the mounting cavity and used for pushing the shrinkage block to extend out of the side wall of the drill bit matrix. During the use, can be connected rock core pipe and drill bit through connecting portion, then go into the drilling rod with drill bit and rock core pipe together in, the piece that contracts is extrudeed to retract to the drill bit matrix this moment, and the elastic component is in the elastic deformation state, stretches out by the drilling rod tip until the drill bit, and the drilling rod inner wall no longer extrudees the piece that contracts, and the elastic component outwards promotes this piece that contracts under self elastic restoring force effect and stretches out outside this drill bit matrix lateral wall.)

1. The utility model provides a collapsible formula drill bit for ocean probing, its characterized in that, the drill bit include the drill bit matrix, set up in drill bit matrix first end is used for connecting the connecting portion of rock core pipe, set up in drill bit matrix center runs through the drill bit matrix and can with the centre bore of rock core pipe intercommunication, set up in run through on the drill bit matrix lateral wall and with the installation cavity of centre bore intercommunication, rotatable set up in shrink piece in the installation cavity and set up in the installation cavity is used for promoting shrink piece stretches out the outer elastic component of drill bit matrix lateral wall.

2. A retractable drill bit for offshore drilling according to claim 1 wherein the first end of the mounting cavity is provided with a rotatable shaft and the first end of the retraction block is provided with a shaft hole rotatably connected to the rotatable shaft.

3. A retractable drill bit for offshore drilling according to claim 2, wherein the second end of the mounting cavity is provided with a limiting shaft, and the second end of the retraction block is provided with an arc-shaped limiting hole for the limiting shaft to pass through;

when the contraction block rotates around the rotating shaft to extend out of the side wall of the drill bit matrix, the limiting shaft abuts against the end part of the first end of the arc-shaped limiting hole.

4. The retractable drill bit for offshore drilling according to claim 3, wherein the elastic member is a torsion spring sleeved on the rotating shaft, a first end of the torsion spring is elastically abutted with a first end of the retracting block, and a second end of the torsion spring is elastically abutted with an inner side wall of the mounting cavity.

5. A retractable drill bit for offshore drilling according to claim 3, wherein the first side wall of the mounting cavity is provided with a first threaded hole for the rotating shaft to be inserted and screwed, the second side wall of the mounting cavity is provided with a first through hole for the rotating shaft to be inserted and passed through, the first end of the rotating shaft is provided with a first threaded post which can be inserted into the first threaded hole and screwed with the first threaded hole, and the second end of the rotating shaft is provided with a first nut;

still be equipped with on the first lateral wall of installation cavity and supply spacing axle inserts the second screw hole of spiro union, still be equipped with on the second lateral wall of installation cavity and supply the second through-hole that the axis of rotation inserted and passed, spacing axle first end be equipped with can insert to in the second screw hole with the second screw thread post of second screw hole spiro union, the axis of rotation second end is equipped with the second nut.

6. The retractable drill bit for offshore drilling according to claim 1, wherein the connecting portion is a cylindrical connecting portion, an external thread for screwing the core barrel is arranged on an outer side wall of the connecting portion, and a plurality of PDC composite sheets are embedded and welded on the end face of the second end of the retraction block.

7. A drilling tool arrangement for offshore drilling, characterized in that the drilling tool arrangement comprises a drill bit according to any one of claims 1-6, a core barrel connected to the connection and communicating with the central bore, a drill rod sleeved outside the core barrel, a connection socket secured to a first end of the core barrel, a casing shoe secured to an end of a second end of the drill rod, and an inner ring seat secured to an inner side wall of the outer sleeve and adapted to be clamped to the connection socket.

8. The drilling apparatus for offshore drilling according to claim 7, wherein the inner ring seat is provided with at least one snap groove at a first end and at least one snap tooth at a second end of the connecting seat corresponding to the snap groove for snapping into the snap groove.

9. The drilling apparatus for offshore drilling as claimed in claim 8, wherein a spearhead is fixedly arranged in the middle of the first end of the connecting socket.

10. A drill tool apparatus for offshore drilling according to claim 7, wherein the casing shoe first end is fixedly connected to the drill pipe second end, the casing shoe second end being provided with a flare for retracting the constriction block.

Technical Field

The invention relates to the field of ocean drilling, in particular to a retractable drill bit and a drilling tool device for ocean drilling.

Background

In ocean scientific drilling aiming at drilling through a 'Mohuo surface', the cost per day exceeds hundreds of thousands of RMB due to the difficult problems of high construction risk, long time consumption and the like of offshore construction operation, and the wire-line coring drilling mode is often adopted for operation in order to improve the drilling coring efficiency in the ocean drilling. The operation characteristic of the wire line core drilling is that all drill rods in a drill hole are not required to be lifted out when the core is taken, a fisher with a special wire rope is adopted, a hole bottom inner tube filled with the core is lifted to the ground through a center hole of the drill rod in the hole, the core is obtained, therefore, the number of times of lifting the drill bit and the auxiliary time of lifting the drill bit are reduced, the drilling efficiency is improved, and when the drill bit is seriously abraded, the whole set of drill bit still needs to be lifted to the ground surface to replace the drill bit. In addition, the construction conditions of drilling at the bottom of the ocean are complex, and borehole wall instability easily causes borehole wall collapse and other in-hole accidents, so that casing pipes need to be put to maintain borehole wall stability. In order to save the operation time and improve the core drilling and casing efficiency, a retractable drill bit and accessory drilling equipment which can be matched with an upper rope core drilling tool and can realize the simultaneous drilling with a casing are needed to be designed for the ocean drilling.

Disclosure of Invention

The present invention addresses the above-identified deficiencies of the prior art by providing a retractable drill bit and drilling tool apparatus for marine drilling.

The technical scheme adopted by the invention for solving the technical problems is as follows: the retractable drill bit for ocean drilling comprises a drill bit matrix, a connecting part arranged at the first end of the drill bit matrix and used for connecting a rock core pipe, a central hole arranged in the center of the drill bit matrix, penetrating through the drill bit matrix and communicated with the rock core pipe, a mounting cavity arranged on the side wall of the drill bit matrix, penetrating through the side wall of the drill bit matrix and communicated with the central hole, a shrinkage block rotatably arranged in the mounting cavity, and an elastic part arranged in the mounting cavity and used for pushing the shrinkage block to extend out of the side wall of the drill bit matrix.

In the retractable drill for offshore drilling according to the present invention, the first end of the installation cavity is provided with a rotating shaft, and the first end of the retraction block is provided with a shaft hole rotatably connected with the rotating shaft.

In the retractable drill for offshore drilling, the second end of the mounting cavity is provided with a limiting shaft, and the second end of the retraction block is provided with an arc-shaped limiting hole for the limiting shaft to pass through;

when the contraction block rotates around the rotating shaft to extend out of the side wall of the drill bit matrix, the limit shaft abuts against the end part of the first end of the arc-shaped limit hole.

In the retractable drill for offshore drilling, the elastic member is a torsion spring sleeved on the rotating shaft, a first end of the torsion spring is elastically abutted with a first end of the retraction block, and a second end of the torsion spring is elastically abutted with the inner side wall of the installation cavity.

In the retractable drill for offshore drilling, a first threaded hole for the rotating shaft to be inserted and screwed is formed in the first side wall of the mounting cavity, a first through hole for the rotating shaft to be inserted and penetrate is formed in the second side wall of the mounting cavity, a first threaded column which can be inserted into the first threaded hole and screwed with the first threaded hole is formed in the first end of the rotating shaft, and a first nut is arranged at the second end of the rotating shaft;

still be equipped with the second screw hole that can supply this spacing axle to insert the spiro union on this installation cavity first side wall, still be equipped with the second through-hole that can supply this axis of rotation to insert and pass on this installation cavity second side wall, this spacing first end of axle is equipped with the second screw thread post that can insert to this second screw hole downthehole and this second screw hole spiro union, and this axis of rotation second end is equipped with the second nut.

In the retractable drill bit for ocean drilling, the connecting part is a cylindrical connecting part, the outer side wall of the connecting part is provided with external threads which can be used for being in threaded connection with the rock core pipe, and the end face of the second end of the retracting block is embedded and welded with a plurality of PDC composite sheets.

The other technical scheme adopted by the invention for solving the technical problem is as follows: the drilling tool equipment comprises the drill bit, a core pipe, a drill rod, a connecting seat, a casing shoe and an inner ring seat, wherein the core pipe is connected with the connecting part and communicated with the central hole, the drill rod is sleeved outside the core pipe, the connecting seat is fixedly arranged at the first end of the core pipe, the casing shoe is fixedly arranged at the end part of the second end of the drill rod, and the inner ring seat is fixedly arranged on the inner side wall of the outer sleeve and can be used for being clamped with the connecting seat.

In the drilling tool device for offshore drilling according to the present invention, the first end of the inner ring seat is provided with at least one engaging groove, and the second end of the connecting seat is provided with at least one engaging tooth capable of engaging into the engaging groove at a position corresponding to the engaging groove.

In the drilling tool device for offshore drilling according to the present invention, the middle of the first end of the connecting base is fixedly provided with the spearhead.

In the drill tool arrangement according to the invention for offshore drilling, the first end of the casing shoe is fixedly connected to the end of the second end of the drill rod, and the second end of the casing shoe is provided with a flare for retracting the constriction block.

The retractable drill bit and the drilling tool equipment for offshore drilling have the following beneficial effects: when the retractable drill bit for ocean drilling is used, the rock core tube and the drill bit can be connected through the connecting part, then the drill bit and the rock core tube are put into the drill rod together, the shrinkage block is extruded and retracted into the drill bit matrix, the elastic piece is in an elastic deformation state until the drill bit extends out of the end part of the drill rod, the shrinkage block is not extruded by the inner wall of the drill rod any more, and the elastic piece pushes the shrinkage block outwards to extend out of the side wall of the drill bit matrix under the action of the elastic restoring force of the elastic piece, so that the effect of increasing the drilling surface of the drill bit is achieved. When the drill bit and the rock core pipe need to be taken back, the rock core pipe and the drill bit are pulled upwards, and the shrinkage block is compressed by the end part of the drill rod and then retracts into the drill bit blank, so that the rock core pipe and the drill bit can be directly taken out along the drill rod, the step that the whole set of drilling tool needs to be lifted to an offshore drilling platform due to the abrasion of the drill bit is avoided, the construction cost is saved, the construction efficiency is improved, and the technical support is provided for realizing the drilling target of Chinese oceanic science.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic representation of the construction of a retractable drill bit for offshore drilling of the present invention;

FIG. 2 is a schematic cross-sectional view of a retractable drill bit for marine drilling of the present invention;

FIG. 3 is a schematic structural view of the uplift state of the marine drilling tool apparatus of the present invention;

FIG. 4 is a schematic cross-sectional view of the uplift state of the drilling tool apparatus of the marine drilling of the present invention;

FIG. 5 is a schematic view of the lowering configuration of the drilling apparatus of the present invention for marine drilling;

fig. 6 is a sectional view showing the lowering state of the drilling tool apparatus for offshore drilling according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, in the first embodiment of the retractable drill bit for offshore drilling of the present invention, the drill bit 1 includes a drill bit casing 2, a connecting portion 3 disposed at a first end of the drill bit casing 2 for connecting to a core barrel 16, a central hole 4 disposed at a center of the drill bit casing 2 and penetrating through the drill bit casing 2 and being capable of communicating with the core barrel 16, a mounting cavity 5 disposed on a sidewall of the drill bit casing 2 and penetrating through a sidewall of the drill bit casing 2 and communicating with the central hole 4, a shrinking block 6 rotatably disposed in the mounting cavity 5, and an elastic member 7 disposed in the mounting cavity 5 and being capable of pushing the shrinking block 6 to extend out of the sidewall of the drill bit casing 2.

When the retractable drill bit 1 for offshore drilling is used, the rock core tube 16 and the drill bit 1 are connected through the connecting part 3, then the drill bit 1 and the rock core tube 16 are put into the drill rod 17 together, at the moment, the shrinkage block 6 is extruded and retracted into the drill bit matrix 2, the elastic piece 7 is in an elastic deformation state until the drill bit 1 extends out from the end part of the drill rod 17, the inner wall of the drill rod 17 does not extrude the shrinkage block 6 any more, and the elastic piece 7 pushes the shrinkage block 6 outwards to extend out of the side wall of the drill bit matrix 2 under the action of the elastic restoring force of the elastic piece 7, so that the effect of increasing the drilling surface of the drill bit 1 is achieved. When the drill bit 1 and the rock core tube 16 need to be taken back, the rock core tube 16 and the drill bit 1 are pulled upwards, and the shrinkage block 6 is extruded by the end part of the drill rod 17 and then retracts into the drill bit matrix 2, so that the rock core tube 16 and the drill bit 1 can be directly taken out along the drill rod 17, the step that the whole set of drilling tool needs to be lifted to an offshore drilling platform due to abrasion of the drill bit 1 is avoided, the construction and maintenance time is saved, the construction cost is saved, and the construction efficiency is improved.

In the present embodiment, a rotation shaft 8 is provided at a first end of the mounting cavity 5, and a shaft hole 9 rotatably connected to the rotation shaft 8 is provided at a first end of the contraction block 6.

When the contraction block 6 is mounted in the mounting chamber 5, the rotation shaft 8 is inserted through the shaft hole 9 so that the contraction block 6 can rotate about the rotation shaft 8, as will be described later.

Furthermore, a second end of the installation cavity 5 is provided with a limit shaft 10, and a second end of the contraction block 6 is provided with an arc-shaped limit hole 11 for the limit shaft 10 to pass through. When the shrinkage block 6 rotates around the rotation shaft 8 to extend out of the sidewall of the drill bit matrix 2, the limiting shaft 10 abuts against the first end of the arc-shaped limiting hole 11.

The arc-shaped limiting hole 11 can limit the angle of the contraction block 6 extending out of the drill bit matrix 2 in rotation and limit the angle of the contraction block 6 retracting into the drill bit matrix 2 in rotation when the contraction block 6 rotates around the rotation shaft 8. Preferably, the arc-shaped limiting hole 11 is a long-strip-shaped arc-shaped limiting hole 11, and the width of the arc-shaped limiting hole 11 is slightly larger than the diameter of the limiting shaft 10. Specifically, the center of the shaft hole 9 is the center of the arc-shaped limiting hole 11.

Specifically, the elastic member 7 is a torsion spring sleeved on the rotation shaft 8, a first end of the torsion spring is elastically abutted against a first end of the contraction block 6, and a second end of the torsion spring is elastically abutted against the inner side wall of the installation cavity 5.

When initial condition, the torsional spring outwards promotes shrink piece 6 under the effect of self elastic recovery power, and shrink piece 6 outwards stretches out under the elastic force of torsional spring, and the first end tip butt in spacing axle 10 and the spacing hole of arc 11 restricts shrink piece 6 and continues outwards to stretch out.

In this embodiment, a first threaded hole for the rotating shaft 8 to be inserted into and screwed into is formed in a first side wall of the mounting cavity 5, a first through hole 12 for the rotating shaft 8 to be inserted into and pass through is formed in a second side wall of the mounting cavity 5, a first threaded post for the rotating shaft 8 to be inserted into and screwed into the first threaded hole is formed at a first end of the rotating shaft, and a first nut is arranged at a second end of the rotating shaft 8.

Similarly, a second threaded hole for inserting the limiting shaft 10 into the threaded connection is further formed in the first side wall of the mounting cavity 5, a second through hole 13 for inserting the rotating shaft 8 and penetrating is further formed in the second side wall of the mounting cavity 5, a second threaded column which can be inserted into the second threaded hole and is in threaded connection with the second threaded hole is arranged at the first end of the limiting shaft 10, and a second nut is arranged at the second end of the rotating shaft 8.

When installation shrink piece 6, will shrink piece 6 and place in installation cavity 5 for first through-hole 12, shaft hole 9 and first screwed hole align, and second through-hole 13, the spacing hole of arc 11 and second screwed hole align, insert first screwed hole in with first screwed hole spiro union after passing first through-hole 12 and shaft hole 9 with axis of rotation 8 in proper order, can realize being connected the rotation of the fixed of axis of rotation 8 and shrink piece 6. And then, the limiting shaft 10 sequentially penetrates through the second through hole 13 and the arc-shaped limiting hole 11 and then is inserted into the second threaded hole to be in threaded connection with the second threaded hole, so that the fixing of the limiting shaft 10 and the limiting of the rotation angle of the contraction block 6 can be realized.

In order to facilitate the connection of the connection part 3 and the core barrel 16, the connection part 3 is a cylindrical connection part 3, the outer side wall of the connection part 3 is provided with external threads which can be used for being screwed with the core barrel 16, and the end face of the second end of the shrinkage block 6 is embedded and welded with a plurality of PDC composite sheets 14. And a plurality of PDC (polycrystalline diamond compact) compacts 14 are embedded and welded on the second end face of the shrinkage block 6, so that the hardness and the wear resistance of the shrinkage block 6 are increased.

In the present embodiment, the drill bit casing 2 is a columnar drill bit casing 2.

As shown in fig. 3-6, in the first embodiment of the drilling tool device for offshore drilling according to the present invention, the drilling tool device 15 includes the drill bit 1, the core barrel 16 connected to the connecting portion 3 and communicating with the central hole 4, the drill rod 17 sleeved outside the core barrel 16, the connecting seat 18 fixed to the first end of the core barrel 16, the casing shoe 19 fixed to the second end of the drill rod 17, and the inner ring seat 20 fixed to the inner sidewall of the outer sleeve and adapted to be engaged with the connecting seat 18.

In the application, the drill rod is used for replacing the traditional casing, so that the casing running construction procedure in the ocean drilling is simplified, and the casing running operation time is saved.

When the drilling tool equipment 15 for ocean drilling is used, the second end of the rock core tube 16 is connected with the drill bit 1 through the connecting part 3, the connecting seat 18 is connected with the first end of the rock core tube 16, then the drill bit 1, the rock core tube 16 and the connecting seat 18 are put into the drill rod 17 through the rope, the contraction block 6 is extruded and retracted into the drill bit matrix 2 at the moment, the elastic piece 7 is in an elastic deformation state until the drill bit 1 extends out of the casing shoe 19 at the second end of the drill rod 17, the inner walls of the drill rod 17 and the casing shoe 19 do not extrude the contraction block 6 any more, and the elastic piece 7 pushes the contraction block 6 outwards to extend out of the side wall of the drill bit matrix 2 under the action of the elastic restoring force of the elastic piece 7 per se, so that the effect of increasing the drilling surface of the drill bit 1 is achieved. When the drill bit 1 and the core barrel 16 need to be taken back, the core barrel 16 and the drill bit 1 are pulled upwards, the contraction block 6 is compressed by the casing shoe 19 and then retracts into the drill bit matrix 2, so that the core barrel 16 and the drill bit 1 can be directly taken out along the drill rod 17, the step that the whole set of drilling tool needs to be lifted to an offshore drilling platform due to abrasion of the drill bit 1 is avoided, the construction and maintenance time is saved, the construction cost is saved, and the construction efficiency is improved.

Meanwhile, in the process of drilling the drill bit 1, rock debris gradually enters the core barrel 16 from the central hole 4, and in the process of pulling up the core barrel 16 and the drill bit 1, the contraction block 6 is compressed by the casing shoe 19 to retract into the drill bit matrix 2 and clamp the core in the central hole 4, so that the function of preventing the core from falling out of the core barrel 16 is achieved.

Furthermore, a first end of the inner ring seat 20 is provided with at least one engaging groove 21, and a second end of the connecting seat 18 is provided with at least one engaging tooth 22 at a position corresponding to the engaging groove 21 and capable of being engaged into the engaging groove 21. When the connecting seat 18 and the inner ring are contacted from the lower part, the latch 22 can be clamped into the clamping groove 21, so that the inner ring seat 20 and the connecting seat 18 are clamped, the drill bit 1 and the drill rod 17 can be fixedly connected, and the drill bit 1 and the drill rod 17 are prevented from rotating mutually.

In order to facilitate the downward lifting and pulling of the connecting seat 18 and the drill bit 1, a fishing spear head 23 is fixedly arranged in the middle of the first end of the connecting seat 18. Preferably, the fishing spear head 23 is provided with a wire groove or wire hole for connecting a hanging rope.

Preferably, a first end of the casing shoe 19 is fixedly connected to a second end of the drill pipe 17, and a second end of the casing shoe 19 is provided with a flare 24 for contracting the constriction block 6. When the drill bit 1 is lifted up, the contraction block 6 is firstly contacted with the bell mouth 24, and the contraction block 6 is retracted into the drill rod 17 under the extrusion of the bell mouth 24, so that the contraction block 6 is prevented from blocking the casing shoe 19, and the drill bit 1 cannot be lifted up.

After collapsible formula drill bit 1 and supporting drilling tool equipment 15 equipment are accomplished, through the salvage mechanism of rope coring drilling tool, transfer collapsible formula drill bit 1 to the bottom of the hole along drilling rod 17 inner wall. When the retractable drill bit 1 is placed down, the elastic piece 7 inside the drill bit matrix 2 is under the action of the inner wall of the drill rod, so that the telescopic block 6 is recovered to the inside of the drill bit matrix 2 and slides down along the inner wall of the drill rod 17. When the drill bit 1 is lowered to a preset hole depth, the bottom of the fishing spearhead 23 is just seated on the clamping groove 21 of the inner ring seat 20, and the telescopic blocks 6 around the drill bit matrix 2 are ejected out of the installation cavity 5 of the drill bit matrix 2 under the action of the elastic pieces 7. When the drill rod 17 rotates, the inner drilling tool is driven to rotate together through the upper inner ring seat 20, so that the functions of reaming and continuing drilling are achieved, and the state shown in fig. 6 is shown; when the retractable drill bit 1 needs to be lifted up, the rope core drilling tool can be directly lifted up through the steel wire rope, at the moment, the telescopic block 6 of the drill bit 1 is inwards recycled, the inner side of the telescopic block 6 is wedged into the core, and the core is blocked, so that the state shown in fig. 4 is realized.

In general, the invention has the following beneficial effects: the drill rod replaces the traditional casing, so that the casing running construction procedure in the ocean drilling is simplified, and the casing running operation time is saved; simultaneously, the wire-line coring mode is adopted inside the drilling device to drill and core, and the telescopic drill bit 1 is lifted and lowered along with the internal wire-line coring drilling tool, so that the step that the whole set of drilling tool is lifted to an offshore drilling platform due to the abrasion of the drill bit is avoided, the construction and maintenance time is saved, the construction cost is saved, and the construction efficiency is improved.

In addition, in the present invention, unless otherwise expressly specified or limited, the terms "connected," "stacked," and the like are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.