阅读说明：本技术 伸缩式护顶板和液压支架 (Telescopic top protection plate and hydraulic support ) 是由 纪帅 孙晓亮 张敬辉 于 2021-01-26 设计创作，主要内容包括：本发明提供了一种伸缩式护顶板和液压支架,伸缩式护顶板包括：连接板,具有侧端；导向板,与侧端枢转连接；支撑件,一端与连接板连接,支撑件的另一端与导向板连接；伸缩板,与导向板滑动连接,伸缩板能够沿第一方向在导向板上滑动。本发明的技术方案中,由于伸缩板能够沿第一方向在导向板上滑动,这样使得护顶板的宽度可调,即通过调节伸缩板相对导向板的伸缩长度就能调节护顶板的宽度,从而使得伸缩式护顶板能够根据不同宽度尺寸的巷道调节护顶板的宽度,以满足伸缩式护顶板的宽度调节要求,避免了相关技术中的护顶板的宽度尺寸不可调而影响液压支架的护顶效果的问题,进而增强了液压支架的护顶效果,而且提高了液压支架的适用范围。(The invention provides a telescopic top protection plate and a hydraulic support, wherein the telescopic top protection plate comprises: a connecting plate having a side end; the guide plate is pivotally connected with the side end; one end of the supporting piece is connected with the connecting plate, and the other end of the supporting piece is connected with the guide plate; the expansion plate is connected with the guide plate in a sliding mode and can slide on the guide plate along the first direction. According to the technical scheme, the telescopic plate can slide on the guide plate along the first direction, so that the width of the top protection plate can be adjusted, namely the width of the top protection plate can be adjusted by adjusting the telescopic length of the telescopic plate relative to the guide plate, the width of the top protection plate can be adjusted by the telescopic top protection plate according to roadways with different width sizes, the width adjustment requirement of the telescopic top protection plate is met, the problem that the width size of the top protection plate in the related technology is not adjustable to influence the top protection effect of the hydraulic support is solved, the top protection effect of the hydraulic support is further enhanced, and the application range of the hydraulic support is widened.)

1. A telescoping roof guard panel (100), the telescoping roof guard panel (100) comprising:

a connecting plate (10) having a side end (12);

a guide plate (20) pivotally connected to the side end (12);

a support member (30) having one end connected to the connecting plate (10) and the other end of the support member (30) connected to the guide plate (20);

the telescopic plate (40) is connected with the guide plate (20) in a sliding mode, and the telescopic plate (40) can slide on the guide plate (20) along a first direction.

2. The retractable roof guard plate (100) according to claim 1, wherein the guide plate (20) is provided with a guide frame opening (22), the guide frame opening (22) is disposed to extend along the first direction, and the guide plate (20) is at least partially slidably disposed in the guide frame opening (22).

3. The telescopic roof protection plate (100) according to claim 2, wherein a plurality of the guide frame openings (22) are formed in the guide plate (20), the plurality of the guide frame openings (22) are spaced apart in the second direction, a guide rail (24) is formed between two adjacent guide frame openings (22), the telescopic plate (40) is provided with a guide opening (42), an open end of the guide opening (42) faces the guide plate (20), and the guide opening (42) is matched with the guide rail (24).

4. The retractable roof guard panel (100) according to claim 3, wherein the guide plate (20) is provided with two guide frame openings (22), one guide rail (24) is formed between the two guide frame openings (22), the retractable plate (40) is provided with one guide opening (42), and one guide opening (42) is matched with one guide rail (24).

5. The telescopic roof guard plate (100) according to claim 1, further comprising a telescopic driving member (50), wherein one end of the telescopic driving member (50) is connected to the guide plate (20), and the other end of the telescopic driving member (50) is connected to the telescopic plate (40).

6. The telescopic roof guard plate (100) according to claim 5, wherein the telescopic driving member (50) is a side-push jack, the telescopic driving member (50) comprises a cylinder (52) and a piston rod (54) telescopically arranged in the cylinder (52), the cylinder (52) is pivotally connected with the guide plate (20), and the piston rod (54) is pivotally connected with the telescopic plate (40).

7. The telescopic roof guard plate (100) according to any one of claims 1 to 6, wherein the telescopic roof guard plate (100) further comprises a first ear plate (60), the first ear plate (60) being provided on the guide plate (20) and the telescopic plate (40), respectively, and being pivotally connected with a telescopic driving member (50) of the telescopic roof guard plate (100).

8. The telescopic roof guard plate (100) according to any one of claims 1 to 6, characterised in that the telescopic roof guard plate (100) further comprises a second ear plate (70), the second ear plate (70) being provided on the connecting plate (10) and the guide plate (20), respectively, and being pivotally connected with the support (30).

9. The telescopic roof guard plate (100) according to any one of claims 1 to 6, characterised in that the support (30) is a support jack, the one end of the support (30) being pivotally connected to the connection plate (10) and the other end of the support (30) being pivotally connected to the guide plate (20).

10. A hydraulic mount, comprising:

a top beam;

the telescopic roof guard plate (100) according to any one of claims 1 to 9, the telescopic roof guard plate (100) being connected to the top beam.

Technical Field

The invention relates to the technical field of hydraulic support equipment, in particular to a telescopic top protection plate and a hydraulic support.

Background

At present, in coal mining, hydraulic supports for support are usually arranged in the roadway for the safety of field workers, and the hydraulic supports comprise top beams. The outer side of the top beam is provided with a top protection plate. The top protection plate mainly plays a supporting role, and prevents the top plate from caving or leaking waste rocks to damage walking personnel below, a reversed loader and other equipment.

The width of the top guard plate in the related art is a fixed width. However, when the width of the roadway changes, the width of the roof guard cannot be adjusted, and the roof guard effect of the roof guard is easily affected.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

Therefore, the invention aims to provide a telescopic roof protection plate.

Another object of the present invention is to provide a hydraulic mount.

In order to achieve the above object, an embodiment of the present invention provides a telescopic roof guard panel, including: a connecting plate having a side end; the guide plate is pivotally connected with the side end; one end of the supporting piece is connected with the connecting plate, and the other end of the supporting piece is connected with the guide plate; the expansion plate is connected with the guide plate in a sliding mode and can slide on the guide plate along the first direction.

In the technical scheme, because the expansion plate can slide on the deflector along the first direction, the width of the top protection plate is adjustable, namely, the width of the top protection plate can be adjusted by adjusting the expansion length of the expansion plate relative to the deflector, so that the width of the top protection plate can be adjusted according to the lanes with different width sizes, the width adjustment requirement of the telescopic top protection plate is met, the problem that the width size of the top protection plate in the related art is not adjustable to influence the top protection effect of the hydraulic support is solved, the top protection effect of the hydraulic support is further enhanced, and the application range of the hydraulic support is widened.

In addition, the telescopic roof protecting plate provided by the invention in the above embodiment may further have the following additional technical features:

in the above technical scheme, a guide frame opening is arranged on the guide plate, the guide frame opening extends along the first direction, and at least part of the guide plate is slidably arranged in the guide frame opening.

In this technical scheme, the guide frame mouth is as accommodation space for the holding expansion plate, ensures like this that the expansion plate can stretch out or retract to in the deflector from the deflector, thereby ensures the flexible function of telescopic roof board of protecting, and then satisfies the width control requirement of telescopic roof board of protecting.

In any of the above technical solutions, the guide plate is provided with a plurality of guide frame openings, the plurality of guide frame openings are arranged at intervals along the second direction, a guide slide rail is formed between two adjacent guide frame openings, the expansion plate is provided with a guide opening, the opening end of the guide opening faces the guide plate, and the guide opening is matched with the guide slide rail.

In this technical scheme, the direction opening cooperatees with the direction slide rail, makes like this to form guide structure between deflector and the expansion plate, and guide structure makes the expansion plate can only follow the flexible slip of length direction of direction slide rail to skew or jamming phenomenon takes place when having avoided the expansion plate to stretch out and draw back, and then ensures that the expansion plate can smoothly stretch out and draw back the slip, with the width regulation efficiency and the regulation precision that improve the roof board are protected to the contraction type.

In any of the above technical solutions, the guide plate is provided with two guide frame openings, a guide slide rail is formed between the two guide frame openings, the expansion plate is provided with a guide opening, and one guide opening is matched with one guide slide rail.

In this technical scheme, a direction opening cooperatees with a direction slide rail, makes like this and forms guide structure between deflector and the expansion plate, and this guide structure is enough to make the expansion plate along the flexible slip of length direction of direction slide rail to skew or jamming phenomenon take place when having avoided the expansion plate to stretch out and draw back, and then ensure that the expansion plate can smoothly stretch out and draw back the slip, with the width regulation efficiency and the regulation precision that improve the roof is protected to the contraction type.

In any one of the above technical solutions, the telescopic top protection plate further includes a telescopic driving member, one end of the telescopic driving member is connected with the guide plate, and the other end of the telescopic driving member is connected with the telescopic plate.

In the technical scheme, the telescopic top protection plate is used as a driving piece and can drive the telescopic plate to telescopically slide along the first direction, so that the telescopic function of the telescopic top protection plate is realized, and the width adjusting requirement of the telescopic top protection plate is further met.

In any one of the above technical solutions, the telescopic driving member is a side-pushing jack, the telescopic driving member includes a cylinder body and a piston rod telescopically disposed in the cylinder body, the cylinder body is pivotally connected to the guide plate, and the piston rod is pivotally connected to the telescopic plate.

In the technical scheme, the piston rod is used for pushing the telescopic plate to extend out of or retract into the guide plate from the guide plate, so that the telescopic function of the telescopic top protection plate is realized, and the width adjusting requirement of the telescopic top protection plate is further met. In addition, the cylinder body is pivotally connected with the guide plate, and the piston rod is also pivotally connected with the telescopic plate. Therefore, the piston rod of the side-push jack can not be blocked in the working process, and the working stability and reliability of the telescopic top protection plate are improved.

In any of the above technical solutions, the telescopic top protection plate further includes a first ear plate, and the first ear plate is respectively disposed on the guide plate and the telescopic plate, and is pivotally connected to the telescopic driving member of the telescopic top protection plate.

In this technical scheme, first otic placode has improved the joint strength of deflector and expansion plate to make the deflector satisfy the intensity requirement of telescopic roof board with being connected of expansion plate.

In any of the above technical solutions, the retractable top protection plate further includes a second ear plate, and the second ear plate is respectively disposed on the connecting plate and the guide plate, and is pivotally connected to the supporting member.

In this technical scheme, the second otic placode has improved the joint strength of deflector and connecting plate to make the connection of deflector and connecting plate satisfy the intensity requirement of telescopic roof guard board.

In any of the above technical solutions, the supporting member is a supporting jack, one end of the supporting member is pivotally connected to the connecting plate, and the other end of the supporting member is pivotally connected to the guide plate.

In the technical scheme, the supporting piece is used for supporting the guide plate, and meanwhile, the supporting piece can drive the guide plate to vertically turn over relative to the connecting plate as the driving piece, so that the turning angle of the guide plate relative to the connecting plate can be adjusted through the supporting piece, and the roof connecting effect of the telescopic roof protecting plate is enhanced.

A technical solution of a second aspect of the present invention provides a hydraulic mount, including: a top beam; the telescopic roof guard plate according to any one of the first aspect, wherein the telescopic roof guard plate is connected to the top beam.

The hydraulic support provided by the technical scheme of the second aspect of the present invention includes the telescopic top protection plate according to any one of the technical schemes of the first aspect, so that all the beneficial effects of any one of the technical schemes are achieved, and no further description is provided herein.

In the above scheme, because hydraulic support has integrateed telescopic and has protected the roof, make hydraulic support have the function of adjusting and protecting the roof width like this to hydraulic support's application scope has been improved, the requirement is protected on in order to satisfy the tunnel of not unidimensional. Because the hydraulic support integrates the telescopic roof protection plate, the hydraulic support has the function of adjusting the width of the roof protection plate, so that the application range of the hydraulic support is widened, and the roof protection requirements of roadways with different sizes are met.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 illustrates a perspective view of a retractable roof guard according to an embodiment of the present invention;

fig. 2 shows a perspective view of the connection plate of fig. 1;

FIG. 3 shows a schematic perspective view of the guide plate of FIG. 1;

FIG. 4 shows a perspective view of the expansion plate of FIG. 1;

FIG. 5 shows a perspective view of the support of FIG. 1;

figure 6 shows a schematic perspective view of the telescopic drive of figure 1;

fig. 7 shows a perspective view of a hydraulic mount according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 7 is:

10. a connecting plate; 11. connecting holes; 12. a side end; 20. a guide plate; 22. a guide frame opening; 24. a guide slide rail; 30. a support member; 40. a retractable plate; 42. a guide opening; 50. a telescopic driving member; 52. a cylinder body; 54. a piston rod; 60. a first ear plate; 70. a second ear panel; 80. a third ear panel; 90. a pin shaft; 100. a telescopic top protection plate; 110. a circular hole; 120. and (5) laneways.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The first direction in the present application refers to the width direction of the guide plate 20, and the second direction in the present application refers to the length direction of the guide plate 20, and specifically, refer to fig. 1.

The following describes the telescopic roof guard plate 100 and the hydraulic support according to some embodiments of the present invention with reference to fig. 1 to 7.

As shown in fig. 1, the present invention and the embodiment of the present invention provide a telescopic roof guard plate 100, and the telescopic roof guard plate 100 includes a connecting plate 10, a guide plate 20, a supporting member 30, and a telescopic plate 40. Wherein the connecting plate 10 has a lateral end 12. The guide plate 20 is pivotally connected to the side end 12. One end of the support 30 is connected to the connection plate 10, and the other end of the support 30 is connected to the guide plate 20. The expansion plate 40 is slidably connected to the guide plate 20, and the expansion plate 40 can slide on the guide plate 20 along a first direction.

In the above arrangement, because the expansion plate 40 can slide on the guide plate 20 along the first direction, the width of the top protection plate is adjustable, that is, the width of the top protection plate can be adjusted by adjusting the expansion length of the expansion plate 40 relative to the guide plate 20, so that the width of the top protection plate can be adjusted according to the lanes 120 with different width sizes by the telescopic top protection plate 100, the width adjustment requirement of the telescopic top protection plate 100 is met, the problem that the width size of the top protection plate in the related art is not adjustable and the top protection effect of the hydraulic support is influenced is avoided, the top protection effect of the hydraulic support is further enhanced, and the application range of the hydraulic support is improved.

Specifically, as shown in fig. 3, in the embodiment of the present invention, the guide plate 20 is provided with the guide frame opening 22, the guide frame opening 22 is extended along the first direction, and the guide plate 20 is partially slidably disposed in the guide frame opening 22.

In the above arrangement, the guide frame opening 22 serves as an accommodating space for accommodating the expansion plate 40, so as to ensure that the expansion plate 40 can extend out of or retract into the guide plate 20 from the guide plate 20, thereby ensuring the expansion function of the telescopic top protection plate 100, and further meeting the requirement of width adjustment of the telescopic top protection plate 100.

Specifically, as shown in fig. 3, in the embodiment of the present invention, the guide frame opening 22 is rectangular in shape. Of course, the shape of the guide frame opening 22 may be set to be other shapes such as a trapezoid or an ellipse according to actual conditions.

Specifically, as shown in fig. 3 and 4, in the embodiment of the present invention, a plurality of guide frame openings 22 are formed in the guide plate 20, the plurality of guide frame openings 22 are spaced apart in the second direction, a guide rail 24 is formed between two adjacent guide frame openings 22, the expansion plate 40 is provided with a guide opening 42, an open end of the guide opening 42 faces the guide plate 20, and the guide opening 42 is matched with the guide rail 24.

In the above arrangement, the guide opening 42 is matched with the guide slide rail 24, so that a guide structure is formed between the guide plate 20 and the expansion plate 40, and the expansion plate 40 can only slide in a telescopic manner along the length direction of the guide slide rail 24, thereby avoiding the phenomenon of deviation or clamping stagnation when the expansion plate 40 expands and contracts, further ensuring that the expansion plate 40 can smoothly slide in a telescopic manner, and improving the width adjustment efficiency and the adjustment precision of the telescopic top protection plate 100.

It should be noted that, the guide structure in this application can be replaced by a form of an embedded trapezoidal groove, but machining is required to ensure accuracy.

Specifically, as shown in fig. 3 and 4, in the embodiment of the present invention, two guide frame openings 22 are formed on the guide plate 20, one guide rail 24 is formed between the two guide frame openings 22, and the extension plate 40 is provided with one guide opening 42, and one guide opening 42 is matched with one guide rail 24.

In the above arrangement, one guide opening 42 is matched with one guide slide rail 24, so that a guide structure is formed between the guide plate 20 and the expansion plate 40, and the guide structure is enough to enable the expansion plate 40 to telescopically slide along the length direction of the guide slide rail 24, thereby avoiding the phenomenon of deviation or clamping stagnation when the expansion plate 40 is expanded and contracted, further ensuring that the expansion plate 40 can smoothly telescopically slide, and improving the width adjustment efficiency and the adjustment precision of the telescopic top protection plate 100.

Specifically, as shown in fig. 6, in the embodiment of the present invention, the telescopic top protection plate 100 further includes a telescopic driving member 50, one end of the telescopic driving member 50 is connected to the guide plate 20, and the other end of the telescopic driving member 50 is connected to the telescopic plate 40.

In the above arrangement, the retractable top protection plate 100 is used as a driving member, and can drive the retractable plate 40 to telescopically slide along the first direction, so that the retractable function of the retractable top protection plate 100 is realized, and the requirement of width adjustment of the retractable top protection plate 100 is met.

Specifically, as shown in fig. 6, in the embodiment of the present invention, the telescopic driving member 50 is a side push jack, the telescopic driving member 50 includes a cylinder 52 and a piston rod 54 telescopically disposed in the cylinder 52, the cylinder 52 is pivotally connected to the guide plate 20, and the piston rod 54 is pivotally connected to the telescopic plate 40.

In the above arrangement, the piston rod 54 is used to push the extension plate 40 to extend from the guide plate 20 or retract to the guide plate 20, so as to achieve the extension function of the retractable top protection plate 100, and further meet the requirement of width adjustment of the retractable top protection plate 100. In addition, cylinder 52 is pivotally connected to guide plate 20, and piston rod 54 is also pivotally connected to expansion plate 40. Therefore, in the working process of the side-push jack, the piston rod 54 cannot be stuck on site, and the working stability and reliability of the telescopic top protection plate 100 are improved.

It should be noted that the telescopic driving member 50 can be configured in other structures, such as a hydraulic cylinder or a driving cylinder, according to the actual situation.

Specifically, as shown in fig. 1, 3 and 4, in the embodiment of the present invention, the telescopic top guard plate 100 further includes a first ear plate 60, and the first ear plate 60 is respectively disposed on the guide plate 20 and the telescopic plate 40 and pivotally connected to the telescopic driving member 50 of the telescopic top guard plate 100.

In the above arrangement, the first ear plate 60 improves the connection strength between the guide plate 20 and the expansion plate 40, so that the connection between the guide plate 20 and the expansion plate 40 meets the strength requirement of the telescopic top protection plate 100.

Specifically, as shown in fig. 1 to 3, in the embodiment of the present invention, the telescopic top protection plate 100 further includes a second ear plate 70, and the second ear plate 70 is respectively disposed on the connecting plate 10 and the guide plate 20 and connected to the support 30.

In the above arrangement, the second ear plate 70 improves the connection strength between the guide plate 20 and the connecting plate 10, so that the connection between the guide plate 20 and the connecting plate 10 meets the strength requirement of the telescopic top protection plate 100.

It should be noted that, as shown in fig. 1 and fig. 2, in the embodiment of the present invention, the telescopic top protecting plate 100 further includes two third ear plates 80, one of the third ear plates 80 is disposed on the guiding plate 20, the other one is disposed on the connecting plate 10, the two third ear plates 80 are correspondingly disposed, the telescopic top protecting plate 100 further includes a pin 90, and the pin 90 is disposed through the two third ear plates 80, so that the guiding plate 20 and the connecting plate 10 are pivotally connected.

Specifically, as shown in fig. 1 and 5, in the embodiment of the present invention, the support member 30 is a support jack, one end of the support member 30 is pivotally connected to the connection plate 10, and the other end of the support member 30 is pivotally connected to the guide plate 20.

In the above arrangement, the supporting member 30 is used for supporting the guide plate 20, and the supporting member 30 is used as a driving member capable of driving the guide plate 20 to vertically turn relative to the connecting plate 10, so that the turning angle of the guide plate 20 relative to the connecting plate 10 can be adjusted through the supporting member 30, thereby enhancing the roof contacting effect of the telescopic roof protecting panel 100.

As shown in fig. 7, the present invention further provides a hydraulic support, which comprises a top beam and the telescopic top guard plate 100 according to any one of the embodiments of the first aspect. Wherein the telescopic top protection plate 100 is connected with the top beam.

In the above arrangement, the hydraulic support is integrated with the telescopic roof protection plate 100, so that the hydraulic support has a function of adjusting the width of the roof protection plate, thereby improving the application range of the hydraulic support and meeting the roof protection requirements of the tunnels 120 with different sizes.

The hydraulic support provided by the second aspect of the present invention includes the retractable top protection plate 100 according to any one of the embodiments of the first aspect, so that all the advantages of any one of the embodiments described above are achieved, and details are not repeated herein.

It should be noted that the connecting plate 10 is provided with a plurality of connecting holes 11, and a fastener is inserted into the connecting holes 11 to connect the connecting plate 10 with the top beam of the hydraulic bracket. The otic placode in this application all is provided with round hole 110, and the otic placode is all welded on corresponding plate body.

The hydraulic support and the telescopic top protection plate 100 in the application have the following advantages:

1. the telescopic function is realized, and the width dimension can be freely adjusted according to the design value.

2. The guide structure can make the stretching more smooth and avoid the phenomenon of deviation or clamping stagnation.

3. The overturning function of the top protection plate (guide plate 20) is realized, the overturning angle of the top protection plate is adjusted, and the top contacting effect of the top protection plate is better.

From the above description, it can be seen that, because the expansion plate 40 can slide on the guide plate 20 along the first direction, the width of the top protection plate is adjustable, that is, the width of the top protection plate can be adjusted by adjusting the expansion length of the expansion plate 40 relative to the guide plate 20, so that the width of the top protection plate can be adjusted according to the lanes 120 with different width dimensions by the telescopic top protection plate 100, thereby meeting the width adjustment requirement of the telescopic top protection plate 100, avoiding the problem that the width dimension of the top protection plate in the related art is not adjustable and the top protection effect of the hydraulic support is affected, further enhancing the top protection effect of the hydraulic support, and improving the application range of the hydraulic support.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. 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 description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. 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.