阅读说明：本技术 一种tbm钢筋网快速支护作业装置及作业方法 (TBM reinforcing mesh rapid supporting operation device and operation method ) 是由 何源福 龙斌 邓朝辉 徐震 曾桂英 李深远 姚捷 谭青 夏毅敏 林赉贶 于 2021-07-09 设计创作，主要内容包括：本发明提供的一种TBM钢筋网快速支护作业装置,包括主梁机架、移动装置、拱架撑紧臂、外环、放置架、牵引件、卷扬机和钢筋网撑紧机构,移动装置可移动的设置在主梁机架上,外环设置在移动装置上,放置架设置在外环下方,成卷的钢筋网可转动的设置于放置架内部,卷扬机设有两个,分别设置在外环的两侧端部,牵引件的一端固定在卷扬机的绳索上,另一端连接于钢筋网上,钢筋网撑紧机构设有多个,沿周向分别设置于外环的内部,本发明提供的一种TBM钢筋网快速支护作业装置及作业方法,利用双卷扬机的形式实现钢筋网的自动旋转展开,从而达到快速支护的效果,大大提高了钢筋网的安装效率和支护效果,减轻了施工人员的劳动强度,提高了施工的安全性。(The invention provides a TBM steel bar mesh quick supporting operation device, which comprises a girder frame, a moving device, an arch frame supporting arm, an outer ring, a placing frame, a traction piece, a winch and steel bar mesh supporting mechanisms, wherein the moving device is movably arranged on the girder frame, the outer ring is arranged on the moving device, the placing frame is arranged below the outer ring, two coiled steel bar meshes are rotatably arranged in the placing frame, the two winches are respectively arranged at the two side ends of the outer ring, one end of the traction piece is fixed on a rope of the winch, the other end of the traction piece is connected to the steel bar meshes, the steel bar mesh supporting mechanisms are provided with a plurality of steel bar mesh supporting mechanisms and are respectively arranged in the outer ring along the circumferential direction, the TBM steel bar mesh quick supporting operation device and the operation method provided by the invention realize the automatic rotating and unfolding of the steel bar meshes by utilizing a double-winch mode, thereby achieving the effect of quick supporting, greatly improving the installation efficiency and the supporting effect of the steel bar meshes, the labor intensity of constructors is reduced, and the construction safety is improved.)

1. A TBM steel bar net fast supporting operation device comprises a girder rack (1), a moving device (2) movably fixed on the girder rack (1), and arch support tensioning arms (3), an outer ring (4), a placing rack (5), a traction piece (6), a winch (7) and a steel bar net tensioning mechanism (8) fixed on the moving device (2), wherein parallel tracks for mounting the moving device (2) are arranged on two sides of the girder rack (1), the moving device (2) comprises a fixed frame, the outer ring (4) is fixed on the outer side of the fixed frame, the outer ring (4) is an annular frame with the lower end not folded, an annular groove (413) for accommodating a rope (71) is formed in the outer side face of the annular frame, and the winches (7) connected with two ends of the rope (71) are respectively fixed at two lower ends of the outer ring (4), one end of the outer ring (4) is also provided with a placing rack (5) for placing the coiled reinforcing steel bar net, and the rope (71) can pull the end part of the coiled reinforcing steel bar net through the traction piece (6).

2. The TBM steel bar net quick support operation device according to claim 1, wherein the main beam frame (1) comprises a main beam (11), connecting plates (12) and four sliding rails (13), the connecting plates (12) are arranged on two sides of the main beam (11), the four sliding rails (13) are respectively arranged on the top and the bottom of the connecting plates (12), and the sliding rails (13) are rectangular pipes which are obliquely arranged.

3. The device for the rapid supporting operation of the TBM steel bar mesh according to claim 1, wherein the moving device (2) comprises a moving frame (21), and side traveling wheels (22) and a front traveling wheel (23) which are fixed on the moving frame (21), wherein each group of the side traveling wheels (22) is provided with two, each group of the front traveling wheels (23) is provided with two, and the side traveling wheels (22) and the front traveling wheels (23) are matched with different sides of the sliding rail (13).

4. The TBM steel bar mesh quick support operation device according to claim 1, wherein the arch frame tensioning arm (3) comprises a tensioning wheel (31), an outer arm (32), a tensioning cylinder (33) and a base (34), the base (34) is arranged on the movable frame (21), the tensioning cylinder (33) is arranged inside the outer arm (32), the other end of the tensioning cylinder is fixed on the base (34), and the tensioning wheel (31) is arranged on the top of the outer arm (32).

5. The TBM steel bar mesh quick support operation device according to claim 1, wherein the steel bar mesh supporting mechanism (8) comprises a roller (81), a swing rod (82) and a swing oil cylinder (83), the swing rod (82) is hinged and fixed on the outer ring (4) through a swing rod joint (821), the roller (81) is arranged at the top of the swing rod (82), and two ends of the swing oil cylinder (83) are respectively hinged on an outer ring swing joint (831) on the outer ring (4) and a swing joint (832) on the swing rod (82).

6. The TBM steel bar net quick support operation device according to claim 1, wherein the outer ring (4) comprises an open ring (41), an upper connecting frame (42), a side connecting frame (43), a rope roller (44), a platform (45), a traction roller (46) and a hook (47), the open ring (41) is provided with a bottom groove (411), a long through groove (412) and an annular groove (413), the rope roller (44) is arranged at the bottom groove (411), the platform (45) is arranged below the open ring (41), the traction roller (46) is arranged at the bottom of the platform (45), the hook (47) is arranged at the side of the platform (45), the upper connecting frame (42) and the side connecting frame (43) are respectively arranged inside the open ring (41), and the outer ring (4) is connected with the movable frame (21) through the upper connecting frame (42) and the side connecting frame (43).

7. The device for the rapid supporting operation of the TBM steel bar net according to claim 6, wherein the placing frame (5) is arranged below the hook (47), the rolled steel bar net (9) is arranged inside the placing frame (5), the winch (7) is arranged on the platform (45), the rope (71) bypasses the rope roller (44) and is connected with the winch (7) on the other side along the annular groove (413);

the traction piece (6) comprises a traction hook (61), a traction rope (62), a traction ring (63) and a connecting piece (64), the traction hook (61) is connected to the reinforcing mesh (9), the traction rope (62) is respectively connected with the traction hook (61) and the traction ring (63), the connecting piece (64) is fixed to a rope (71), and the traction ring (63) is hinged to the connecting piece (64).

8. The operation method of the TBM reinforcing mesh rapid supporting operation device is characterized by comprising the following steps:

a, transporting and fixing the manufactured coiled reinforcing mesh (9) to a placing rack (5) by using a crane;

step B, manually hanging one end of the reinforcing mesh (9) on a traction hook (61);

c, simultaneously starting two winches (7), one for releasing and one for retracting, and driving the reinforcing mesh (9) to slide and expand through the traction hook (61); when the reinforcing mesh (9) is fully paved in a certain range of space above the outer ring (4), the winch (7) stops running;

d, simultaneously driving the tensioning oil cylinder (33) and the swing oil cylinder (83), controlling the tensioning wheel (31) and the roller (81) to extend outwards, and stably tensioning the reinforcing mesh (9) to the rock wall;

and E, manually carrying out soil nailing operation to fix the reinforcing mesh (9), and then returning the winch (7), the arch centering bracing arm (3) and the reinforcing mesh bracing mechanism (8) to the original positions to wait for the next cycle operation.

Technical Field

The invention relates to the technical field of rapid support of tunnel collapse, in particular to a rapid support operation device for a TBM (tunnel boring machine) steel bar mesh, and also provides a rapid support operation method for the TBM steel bar mesh.

Background

After the TBM (Tunnel Boring machine) is tunneled, a tunnel needs to be effectively supported in time to prevent the tunnel from collapsing, and the main tunnel supporting means at present is steel arch frame supporting. However, in some emergency situations, the supporting effect of the steel arch by the light is not enough, and a steel bar mesh must be supplemented.

At present, the installation of the reinforcing mesh is mainly operated by manually matching with a reinforcing mesh installer, and firstly, processed reinforcing mesh sheets are arranged on the reinforcing mesh installer and are bound, connected and fixed by thin steel wires; the reinforcing bar net mounting device jacks up reinforcing bar net pieces to a rock surface mounting position, the reinforcing bar net pieces are fixed through a base plate at the tail of the anchor rod and the set reinforcing bars, and then the adjacent reinforcing bar net pieces are welded and fixed. The installation environment of the reinforcing mesh is very bad, strong vibration, much dust, dark and damp, even harmful gas, tunnel collapse and other conditions can occur, the labor intensity of manual operation is high, the working efficiency is low, and the risk is very large. The installation operation efficiency of the reinforcing mesh is low, and natural disasters such as collapse, water burst and the like are easily caused due to untimely support.

The installation of the reinforcing mesh mainly depends on a large amount of manual work, and the quality, the efficiency and the safety of construction cannot be guaranteed. When the emergency collapse occurs, the quick support effect cannot be achieved.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a TBM reinforcing mesh rapid supporting operation device and an operation method thereof, which aim to solve the problems in the background art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a TBM reinforcing bar net quick support operation device, includes the girder frame, and the mobile device of portable fixing in the girder frame to and fix bow member stretching arm, outer loop, rack, traction member, hoist engine and reinforcing bar net stretching mechanism on the mobile device, girder frame both sides are provided with the parallel track of carry mobile device, the mobile device includes fixed frame, the fixed frame outside is fixed with the outer loop, the outer loop is the annular frame that the lower extreme did not fold, annular frame's lateral surface is provided with the ring channel that holds the rope, two lower tip of outer loop are fixed with the connection respectively the hoist engine at rope both ends, the one end of outer loop still is provided with the rack of placing the reinforcing bar net of lapping, the rope can pull the tip of the reinforcing bar net of lapping through traction member.

The arch frame bracing arms are symmetrically arranged on two sides of the main beam rack, one end of the traction piece is fixed on a rope of the winch, the other end of the traction piece is connected to the steel bar net, and the steel bar net bracing mechanisms are four and fixed on the outer ring along the circumferential direction of the outer ring.

Further, the girder frame includes girder, connecting plate and slide rail, the connecting plate set up in the both sides of girder, the slide rail is equipped with four, set up respectively in the top and the bottom of connecting plate, the slide rail is the rectangular pipe that the slant was arranged.

Further, the moving device is provided with two moving devices, the moving devices comprise moving frames, and side traveling wheels and front traveling wheels which are fixed on the moving frames, the two moving frames are combined to form a fixed frame, each group of the side traveling wheels is provided with two, each group of the front traveling wheels is provided with two, and the side traveling wheels and the front traveling wheels are matched with different sides of the sliding rail.

Further, the arch centering props tight arm including propping tight wheel, outer arm, propping tight hydro-cylinder and base, the base sets up on the moving frame, prop tight hydro-cylinder set up in inside the outer arm, the other end is fixed in on the base, prop tight wheel set up in the outer arm top.

Furthermore, the reinforcing mesh bracing mechanism comprises a roller, a swing rod and a swing oil cylinder, the swing rod is hinged and fixed on the outer ring through a swing rod joint, the roller is arranged at the top of the swing rod, and two ends of the swing oil cylinder are respectively hinged on the outer ring swing joint on the outer ring and the swing joint on the swing rod.

Further, the outer ring comprises a split ring, an upper connecting frame, a side connecting frame, a rope roller, a platform, a traction roller and a hook, wherein a bottom groove, a long through groove and an annular groove are formed in the split ring, the rope roller is arranged at the bottom groove, the platform is arranged below the split ring, the traction roller is arranged at the bottom of the platform, the hook is arranged on the side edge of the platform, the upper connecting frame and the side connecting frame are respectively arranged in the split ring, and the outer ring is connected with the movable frame through the upper connecting frame and the side connecting frame.

Furthermore, the placing frame is arranged below the hook, the coiled reinforcing mesh is arranged in the placing frame, the winch is arranged on the platform, and the rope bypasses the rope roller and is connected with the winch on the other side along the annular groove;

the traction part comprises a traction hook, a traction rope, a traction ring and a connecting piece, the traction hook is connected to the reinforcing steel bar net, the traction rope is respectively connected with the traction hook and the traction ring, the connecting piece is fixed on the rope, and the traction ring is hinged to the connecting piece.

The operation method of the TBM reinforcing mesh rapid supporting operation device comprises the following steps:

step A, transporting and fixing the manufactured coiled reinforcing mesh to a placing frame by using a crane;

step B, manually hanging one end of the reinforcing mesh on a traction hook;

c, starting two winches simultaneously, releasing one rope and retracting one rope, and driving the reinforcing mesh to slide and expand through the traction hook; when the reinforcing mesh is paved in a certain range of space above the outer ring, the winch stops running;

step D, simultaneously driving the tensioning oil cylinder (33) and the swing oil cylinder, controlling the tensioning wheel and the roller to extend outwards, and stably tensioning the reinforcing mesh to the rock wall;

and E, manually carrying out soil nailing operation to fix the reinforcing mesh, and then returning the winch, the arch centering bracing arm and the reinforcing mesh bracing mechanism to the original positions to wait for the next cycle operation.

Compared with the prior art, the TBM reinforcing mesh rapid supporting operation device and the operation method provided by the invention have the advantages that the complex process of controlling a reinforcing mesh installer is omitted, and the automatic rotary expansion of the reinforcing mesh is realized by using a double-winch mode, so that the rapid supporting effect is achieved, the installation efficiency and the supporting effect of the reinforcing mesh are greatly improved, the labor intensity of constructors is reduced, and the construction safety is improved; the main beam frame, the moving device and the arch center bracing arm are all of original structures on the TBM, and the reinforcing mesh is installed in an auxiliary mode on the premise that the original functions are met, so that the occupied space of the operation device is greatly reduced, the structure is simple and compact, the operation is convenient, and the bracing effect is good.

Drawings

FIG. 1 is a front view of the body construction of the present invention;

FIG. 2 is a left side view of the body construction of the present invention;

FIG. 3 is a perspective view of the body construction of the present invention;

FIG. 4 is a schematic structural view of a main beam frame portion of the present invention;

FIG. 5 is a schematic diagram of the structure of a mobile device portion of the present invention;

FIG. 6 is a schematic view of the construction of the arch bracing arm portion of the present invention;

FIG. 7 is a schematic view of the outer ring portion of the present invention;

fig. 8 is a schematic structural view of the outer ring and the reinforcing mesh stretching mechanism part in the present invention;

fig. 9 is a schematic structural view of a part of a reinforcing mesh support driving apparatus according to the present invention;

fig. 10 is a schematic view showing the effect of the reinforcing mesh bracing operation of the present invention.

In FIGS. 1-10: 1. girder framework, 2, mobile device, 3, arch centering bracing arm, 4, outer ring, 5, placing rack, 6, traction piece, 7, winch, 8, reinforcing mesh bracing mechanism, 9, reinforcing mesh, 11, girder, 12, connecting plate, 13, sliding rail, 21, mobile frame, 22, side traveling wheel, 23, forward traveling wheel, 31, bracing wheel, 32, outer arm, 33, bracing cylinder, 34, base, 41, split ring, 42, upper connecting frame, 43, side connecting frame, 44, rope roller, 45, platform, 46, traction roller, 47, hook, 61, traction hook, 62, traction rope, 63, traction ring, 64, connecting piece, 71, rope, 81, roller, 82, swing rod, 83, swing cylinder, 411, bottom groove, 412, long through groove, 413, annular groove, 821, swing joint, 831, outer ring swing joint, 832, swing rod swing joint.

Detailed Description

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; 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.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

As shown in fig. 1-3, a device for quickly supporting a TBM reinforcing mesh comprises a main girder frame 1, a moving device 2 which can be movably fixed on the main beam frame 1, an arch center stretching arm 3 which is fixed on the moving device 2, an outer ring 4, a placing frame 5, a traction piece 6, a winch 7 and a reinforcing mesh stretching mechanism 8, parallel tracks for mounting the mobile device 2 are arranged on two sides of the main beam frame 1, the mobile device 2 comprises a fixed frame, an outer ring 4 is fixed on the outer side of the fixed frame, the outer ring 4 is an annular frame with the lower end not folded, an annular groove 413 for accommodating the rope 71 is arranged on the outer side surface of the annular frame, the two lower end parts of the outer ring 4 are respectively fixed with a winch 7 connected with the two ends of the rope 71, one end of the outer ring 4 is also provided with a placing frame 5 for placing the rolled steel bar mesh, and the rope 71 can pull the end part of the rolled steel bar mesh through the traction piece 6.

In this embodiment, the mobile device 2 is provided with two, the movable setting is in girder frame 1 both sides, the bow member props tight arm 3 and is equipped with four, the symmetry sets up on two mobile device 2, outer loop 4 sets up on mobile device 2, rack 5 sets up in outer loop 4 below, the rotatable setting in rack 5 of the reinforcing bar net 9 of lapping, hoist engine 7 is equipped with two, set up respectively in the both sides tip of outer loop 4, the one end of pull 6 is fixed on the rope 71 of hoist engine 7, the other end is connected on reinforcing bar net 9, reinforcing bar net props tight mechanism 8 and is equipped with four, fix respectively in the inboard of outer loop 4 along circumference.

As shown in fig. 4, in this embodiment, the main beam frame 1 includes a main beam 11, four connecting plates 12 and four sliding rails 13, the connecting plates 12 are disposed on two sides of the main beam 11, the four sliding rails 13 are respectively disposed on the top and the bottom of the connecting plates 12, and the sliding rails 13 are rectangular pipes arranged obliquely.

As shown in fig. 5, in the present embodiment, the moving device 2 includes a moving frame 21, two side traveling wheels 22 and a front traveling wheel 23, the two moving frames 21 are combined to form an integrated or detachable fixed frame, each group of the side traveling wheels 22 is provided with two, the two side traveling wheels are respectively provided at the side of the moving frame 21 along the vertical direction and are matched with the side of the slide rail 13, each group of the front traveling wheels 23 is provided with two, the two front traveling wheels are respectively provided at the bottom and the top of the inner side of the moving frame 21 and are respectively matched with the top surface or the bottom surface of the slide rail 13, the side traveling wheels 22 and the front traveling wheels 23 are simultaneously matched with the slide rail 13, and the linear motion of the moving frame 21 is realized.

As shown in fig. 6, as an alternative embodiment, the arch bracing arm 3 includes a bracing wheel 31, an outer arm 32, a bracing cylinder 33 and a base 34, the base 34 is disposed on the moving frame 21, the bracing cylinder 33 is disposed inside the outer arm 32, the bracing cylinder 33 is respectively connected with the base 34 and the outer arm 32, the bracing wheel 31 is disposed on the top of the outer arm 32 and is used for pushing the bracing wheel 31 to contact with the steel arch under the extension and contraction of the bracing cylinder 33 and completing the bracing operation, and in the present invention, the arch bracing arm 3 is also used for assisting in bracing the steel mesh.

As shown in fig. 7, in this embodiment, the mesh reinforcement bracing mechanism 8 includes a roller 81, a swing link 82, and a swing cylinder 83, the swing link 82 is disposed on the outer ring 4 through a swing link joint 821 and can rotate freely around the swing link joint 821, the roller 81 is disposed on the top of the swing link 82, the swing cylinder 83 is respectively hinged to the outer ring swing joint 831 and the swing link swing joint 832, and the swing cylinder 83 is driven to control the rotation of the swing link 82, so as to adjust the position of the roller 81 and realize bracing or releasing.

As shown in fig. 8, in the present embodiment, the outer ring 4 includes a split ring 41, an upper connecting frame 42, a side connecting frame 43, a rope roller 44, a platform 45, a traction roller 46 and a hook 47, the split ring 41 is provided with a bottom slot 411, a long through slot 412 and an annular slot 413, the bottom slot 411 is used for the rope 71 of the winch 7 to pass through, the long through slot 412 is used for the roller 81 to go in and out, the annular slot 413 is used for restricting the position of the rope 71 on the outer ring 4, the rope roller 44 is arranged at the bottom slot 411 and is used for reducing friction when the rope 71 passes through, the platform 45 is arranged below the split ring 41, the traction roller 46 is arranged at the bottom of the platform 45, the hook 47 is arranged at the side of the platform 45, the upper connecting frame 42 and the side connecting frame 43 are respectively arranged inside the split ring 41, and the outer ring 4 is connected with the moving frame 21 through the upper connecting frame 42 and the side connecting frame 43.

As shown in fig. 9, in this embodiment, the placing frame 5 is disposed below the hook 47, the rolled mesh reinforcement 9 is freely rotatably disposed inside the placing frame 5, the winding machine 7 is disposed on the platform 45, the rope 71 thereof bypasses the rope roller 44 and is connected to the winding machine 7 on the other side along the annular groove 413, the two winding machines 7 are synchronously driven, and the rope is unwound and retracted while being released, so as to drive the traction member 6 to circumferentially move along the split ring 41, thereby driving the mesh reinforcement to be circumferentially laid.

The traction member 6 comprises a traction hook 61, a traction rope 62, a traction ring 63 and a connecting piece 64, the traction hook 61 is connected to the steel mesh 9, the traction rope 62 is respectively connected with the traction hook 61 and the traction ring 63, the connecting piece 64 is fixed on a rope 71, and the traction ring 63 is hinged with the connecting piece 64.

The invention also provides a TBM reinforcing mesh rapid supporting operation method, which comprises the following steps:

step A, transporting a coiled reinforcing mesh 9 manufactured in a factory to a placing rack 5 by using a crane;

step B, manually hanging one end of the reinforcing mesh 9 on the traction hook 61;

step C, two winches 7 are started simultaneously, one is used for releasing the ropes, the other is used for retracting the ropes, and the steel bar mesh 9 is driven to slide and expand through the traction hook 61; when the reinforcing mesh 9 is fully paved in the space of 240 degrees above, the winch 7 stops running;

step D, referring to fig. 10, driving the tightening cylinder 33 and the swing cylinder 83 at the same time, controlling the tightening wheel 31 and the roller 81 to extend outward, and tightening the mesh reinforcement 9 to the rock wall stably;

and E, manually carrying out soil nailing operation to fix the reinforcing mesh 9, and then returning the winch 7, the arch centering support arm 3 and the reinforcing mesh support mechanism 8 to the original positions to wait for the next cycle operation. The operation method gets rid of the defects of low efficiency and long time consumption of manual net pulling in the past, can fix a section of reinforcing steel bar net within a few minutes, improves the automation degree, has higher working efficiency and strong practicability, and can be popularized as soon as possible.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.