阅读说明：本技术 绝缘支架 (Insulating support ) 是由 黄志敏 戚明 邝国安 杜俭 袁野 朱强 于 2020-12-10 设计创作，主要内容包括：本申请涉及一种绝缘支架。该绝缘支架用于支撑设于支撑物上的试验引线,包括绝缘支撑件,绝缘夹持件及绝缘固定件,绝缘支撑件用于支撑试验引线,绝缘夹持件连接于绝缘支撑件一端,绝缘夹持件被构造为用于夹持于支撑物,绝缘固定件可拆卸地连接于绝缘支撑件的另一端,用于将试验引线定位于绝缘支撑件。该绝缘支架通过设置绝缘夹持件,将绝缘支撑件固定在支撑物上,以替代人工使用绝缘棒对试验引线进行支撑,减少对作业人员的体力消耗,且能降低长时间登高作业的风险,通过设置绝缘固定件,可以将试验引线稳固在绝缘支撑件上,提高试验测试准确度,防止试验引线掉落造成设备损坏及人员伤害的情况发生。(The present application relates to an insulating support. The insulating support is used for supporting the test lead arranged on the support and comprises an insulating support part, an insulating clamping part and an insulating fixing part, wherein the insulating support part is used for supporting the test lead, the insulating clamping part is connected to one end of the insulating support part, the insulating clamping part is constructed to be clamped on the support, and the insulating fixing part is detachably connected to the other end of the insulating support part and used for positioning the test lead on the insulating support part. This insulating support fixes insulating support piece on the support through setting up insulating holder to replace artifical insulating rod of using to support experimental lead wire, reduce the physical demands to the operation personnel, and can reduce the risk of long-time operation of ascending a height, through setting up insulating mounting, can stabilize experimental lead wire on insulating support piece, improve experimental test accuracy, prevent that experimental lead wire from dropping and causing the condition of equipment damage and personnel's injury to take place.)

1. An insulating support for supporting a test lead on a support, the insulating support comprising:

the insulating support piece is used for supporting the test lead;

an insulating holder connected to one end of the insulating support, the insulating holder configured to be held to a support; and

and the insulating fixing piece is detachably connected to the insulating support piece and is used for positioning the test lead on the insulating support piece.

2. The insulating holder according to claim 1, wherein the insulating clamp comprises:

the first clamping part is connected with one end of the insulating support part; and

the second clamping part is connected to the first clamping part, and the first clamping part and the second clamping part are matched to form a clamping position for clamping a support;

wherein the second clamping portion is configured to be pivotally connected to the first clamping portion about an axis.

3. The insulating support according to claim 1, wherein the insulating clamp comprises an adjusting rod having an operating end and an abutting end opposite to the operating end;

the adjusting rod is in threaded connection with the insulating clamping piece, and the abutting end is used for pressing the support.

4. The insulating support according to claim 3, wherein the insulating clamp further comprises an adjusting block, and the adjusting block is fixedly connected to the abutting end of the adjusting rod.

5. The insulating holder according to claim 4, wherein the insulating clamp has a clamping face;

the clamping surface is inwards sunken to form an accommodating groove; the bottom wall of the accommodating groove is provided with a first threaded hole, the adjusting rod is in threaded connection with the first threaded hole and extends into the accommodating groove, and the adjusting block is at least partially contained in the accommodating groove.

6. The dielectric holder according to claim 1, wherein the dielectric holder has a holding surface and a mounting surface opposite to the holding surface, the mounting surface of the dielectric holder is further provided with a slide rail portion, and one end of the dielectric support member is provided with a slide block;

the sliding block is connected to the sliding rail part in a sliding mode, so that the insulating supporting piece can move relative to the insulating clamping piece along a preset track.

7. The insulating support according to claim 1, wherein the insulating support comprises a first telescopic member and a second telescopic member movably connected in an axial direction;

the second telescopic piece can extend forwards or retract backwards relative to the first telescopic piece along the axial direction.

8. The insulating support of claim 7, further comprising a locking structure on the insulating support for axially locking the first telescoping member and the second telescoping member.

9. The insulating holder as claimed in claim 1, wherein the insulating holder includes:

a first fixing member;

the second fixing piece is detachably connected to the first fixing piece;

the first fixing piece and the second fixing piece are configured to be matched with each other to form a fixing hole; the insulating support is detachably connected to the insulating fixing piece through the fixing hole;

the third fixing piece is detachably connected to the second fixing piece;

the second fixing piece and the third fixing piece are configured to be matched with each other to form a lead hole for positioning a test lead.

10. The insulating holder as claimed in claim 9, wherein the insulating holder further comprises:

the first fastening unit is in threaded connection with the second threaded hole of the second fixing piece and penetrates through the second threaded hole of the second fixing piece to be in threaded connection with the third threaded hole of the third fixing piece; the third fixing piece can be connected with or separated from the second fixing piece by the first fastening unit;

the third fixing piece is provided with a third fastening unit, and a third threaded hole is formed in the third fixing piece and communicated with the lead hole; the second fastening unit is screwed in the fourth threaded hole of the third fixing member and penetrates through the fourth threaded hole of the third fixing member to abut against the test lead in the lead hole.

Technical Field

The application relates to the technical field of electric power, in particular to an insulating support used in a high-voltage equipment voltage withstand test.

Background

In order to ensure the safe and stable operation of the power grid, high-voltage tests, maintenance and other work need to be carried out on each substation device regularly, and when the high-voltage tests are carried out on the high-voltage devices, if the distance between a test lead and adjacent equipment is insufficient, the accuracy of test data is influenced, and even potential safety hazards are caused to human bodies and equipment. This requires the use of an auxiliary tool to keep the test lead at a sufficient distance from the adjacent equipment.

Because the field operation environment receives geographical position restriction, the testing personnel often need ascend a height in high voltage lead wire department, fix the test lead wire with insulating material, perhaps support the test lead wire with the insulating rod who carries, use to get up to waste time, hard, work efficiency is low, and because fixed effect is not good to the test lead wire to the risk that the test lead wire drops easily takes place.

Disclosure of Invention

Therefore, it is necessary to provide an insulating support for solving the problems of time and labor waste and easy falling of a test lead when the test lead is fixed in the prior art.

According to an aspect of the present application, there is provided an insulating support for supporting a test lead provided on a support, the insulating support comprising:

the insulating support piece is used for supporting the test lead;

an insulating holder connected to one end of the insulating support, the insulating holder configured to be held to a support; and

and the insulating fixing piece is detachably connected to the insulating support piece and is used for positioning the test lead on the insulating support piece.

In one embodiment, the insulating clip comprises:

the first clamping part is connected with one end of the insulating support part; and

the second clamping part is connected to the first clamping part, and the first clamping part and the second clamping part are matched to form a clamping position for clamping a support;

wherein the second clamping portion is configured to be pivotally connected to the first clamping portion about an axis.

In one embodiment, the insulating clamping piece comprises an adjusting rod, and the adjusting rod is provided with an operating end and an abutting end opposite to the operating end;

the adjusting rod is in threaded connection with the insulating clamping piece, and the abutting end is used for pressing the support.

In one embodiment, the insulating clamping member further comprises an adjusting block, and the adjusting block is fixedly connected to the abutting end of the adjusting rod.

In one embodiment, the insulating clamp has a clamping face;

the clamping surface is inwards sunken to form an accommodating groove; the bottom wall of the accommodating groove is provided with a first threaded hole, the adjusting rod is in threaded connection with the threaded hole and extends into the accommodating groove, and the adjusting block is at least partially capable of being accommodated in the accommodating groove.

In one embodiment, the insulating clamping piece is provided with a clamping surface and a mounting surface opposite to the clamping surface, the mounting surface of the insulating clamping piece is also provided with a sliding rail part, and one end of the insulating support piece is provided with a sliding block;

the sliding block is connected to the sliding rail part in a sliding mode, so that the insulating supporting piece can move relative to the insulating clamping piece along a preset track.

In one embodiment, the insulating support comprises a first telescopic part and a second telescopic part which are movably connected along the axial direction;

the second telescopic piece can extend forwards or retract backwards relative to the first telescopic piece along the axial direction.

In one embodiment, the insulating support further comprises a locking structure thereon, and the locking structure is used for axially locking the first telescopic piece and the second telescopic piece.

In one embodiment, the insulating fixture includes:

a first fixing member;

the second fixing piece is detachably connected to the first fixing piece;

the first fixing piece and the second fixing piece are configured to be matched with each other to form a fixing hole; the insulating support is detachably connected to the insulating fixing piece through the fixing hole;

the third fixing piece is detachably connected to the second fixing piece;

the second fixing piece and the third fixing piece are configured to be matched with each other to form a lead hole for positioning a test lead.

In one embodiment, the insulating fixture further comprises:

the first fastening unit is in threaded connection with the second threaded hole of the second fixing piece and penetrates through the second threaded hole of the second fixing piece to be in threaded connection with the third threaded hole of the third fixing piece; the third fixing piece can be connected with or separated from the second fixing piece by the first fastening unit;

the third fixing piece is provided with a third fastening unit, and a third threaded hole is formed in the third fixing piece and communicated with the lead hole; the second fastening unit is screwed in the fourth threaded hole of the third fixing member and penetrates through the fourth threaded hole of the third fixing member to abut against the test lead in the lead hole.

Above-mentioned insulating support, through setting up insulating support piece with the experimental lead wire of support, and set up insulating holder, with fix insulating support piece on the supporter, can replace the manpower to use insulating rod to support experimental lead wire, reduce the physical demands to the operation personnel, and can reduce the risk of long-time operation of ascending a height, through setting up insulating mounting, can stabilize experimental lead wire on insulating support piece, improve experimental test accuracy, and prevent effectively that experimental lead wire from dropping from insulating support piece and the equipment that leads to damage and the condition of human injury from taking place.

Drawings

FIG. 1 is a schematic view of an embodiment of an insulating support of the present application;

fig. 2 is a schematic structural view of the insulating support shown in fig. 1 from another perspective.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application 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 therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, 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 intervening media. 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.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

At present, in a power grid, a high voltage withstand test is required for primary equipment of a transformer, a switch, a transformer, a lightning arrester, and the like to check the insulation condition of the primary equipment. During testing, the test voltage is generally higher than the operating voltage of the primary equipment, so that the requirement on environmental conditions is very high during testing, and particularly the insulation of the test lead wire to the ground (the shell) is required to be good.

In the past, the test lead is hung by using an insulating rope or an insulating plastic belt, so that the operation is time-consuming and labor-consuming, and the insulating rope and the insulating plastic belt are easy to loosen or break, thereby causing potential safety hazards to people and equipment.

Therefore, the present application provides an insulating support, which can better improve the above-mentioned problems.

The insulating support of the present application will be described with reference to the accompanying drawings.

FIG. 1 illustrates a schematic view of an insulating support structure in one embodiment of the present application; fig. 2 shows a schematic view of another perspective of the insulating support shown in fig. 1. For the purpose of illustration, only the structures described in connection with the present application are illustrated in the drawings.

The insulating support 100 disclosed in at least one embodiment of the present application is used for supporting a test lead in a voltage withstand test, and the insulating support 100 includes an insulating support 110, an insulating clamping member 120, and an insulating fixing member 130.

When high-voltage test is performed on high-voltage equipment, the insulating support piece 110 is used for supporting a test lead to ensure that the test lead and nearby equipment keep a sufficient safety distance, so that the accuracy of test data is improved, and threats to human bodies and equipment are avoided. The insulating support 110 may be formed in a rod shape, or may be formed in other shapes, and is not particularly limited thereto, and may function to support the test lead.

In some embodiments, the insulating support 110 includes a first telescopic member 111 and a second telescopic member 112 movably connected in an axial direction, and the second telescopic member 112 can be extended or retracted in the axial direction relative to the first telescopic member 111. For example, in one embodiment, the first telescopic member 111 is hollow and slidably sleeved on the outer wall of the second telescopic member 112. Thus, the second telescopic part 112 can extend forwards or retract backwards relative to the first telescopic part 111 along the axial direction of the first telescopic part 111, so as to change the length of the insulating support part 110, and further meet the fixing requirements on the test lead under different working distances.

Further, in some embodiments, the insulating support 110 further comprises a locking structure for locking the first telescopic member 111 and the second telescopic member 112 in the axial direction. Specifically, in one embodiment, a sliding groove extending along an axial direction of the first telescopic member 111 and a locking groove communicating with an end of the sliding groove and extending along a circumferential direction of an inner wall of the first telescopic member 111 are formed on the inner wall of the first telescopic member 111. The outer wall of the second telescopic member 112 is formed with a locking pin protruding outwards, and the sliding groove, the locking groove and the locking pin cooperate to form a locking mechanism of the insulating support member. Specifically to in the practical application, when needing second extensible member 112 to stretch out forward relative first extensible member 111, slide the spout on first extensible member 111 with the locking round pin on second extensible member 112, treat that the locking round pin slides when the tip of spout, rotate first extensible member 111, can rotate the locking round pin and lock in the locking groove, realize the axial direction locking of first extensible member 111 and second extensible member 112, easy operation is convenient. Conversely, the locking of the first telescopic member 111 and the second telescopic member 112 in the axial direction can be unlocked by adopting the operation steps opposite to the above operation steps. It is to be understood that the above examples are for illustrative purposes only and are not to be construed as limiting the present application.

One end of the insulating support 110 is connected to an insulating clamping member 120, and the insulating clamping member 120 is used for clamping on a support to fix the insulating support 100 and simultaneously for ensuring that the test lead on the insulating support 110 has a sufficient safety distance from the nearby equipment.

Specifically, the insulating clamping member 120 includes a first clamping portion 121 and a second clamping portion 122, the first clamping portion 121 is connected to one end of the insulating support member 110, and the second clamping portion 122 is connected to the first clamping portion 121 to form a clamping position for clamping the support. The second clamping portion 122 is pivotally connected to the first clamping portion 121 about an axis. For example, the second clamping portion 122 is hinged to the first clamping portion 121, and when clamping the support, the second clamping portion 122 pivots around an axis to facilitate the support to be clamped into the clamping position. After the support is clamped into the clamping position, the second clamping portion 122 is rotated in the direction of reducing the clamping position, so that the support is clamped on the support. So, through the not unidimensional supporter card of being convenient for go into the centre gripping position, improved the operation convenience.

In the actual high-pressure test operation, supports with different shapes and sizes exist. In order to fix the insulating clamping member 120 on supports with different shapes and sizes, in an embodiment, the insulating clamping member 120 includes an adjusting rod 123, the adjusting rod 123 has an operating end 1231 and an abutting end 1232 opposite to the operating end 1231, the adjusting rod 123 is screwed to the insulating clamping member 120, and the abutting end 1232 is used for pressing the supports. For example, when the size of the support is small, the operation end 1231 is used for screwing the adjusting rod 123, so that the clamping position of the insulating clamping piece 120 becomes small, the abutting end 1232 can abut against the support, and the insulating clamping piece 120 is firmly connected with the small support; when the size of the support is larger, the adjusting rod 123 is unscrewed through the operating end 1231, the clamping position of the insulating clamping piece 120 is enlarged, and the fastening connection between the insulating clamping piece 120 and the support with the larger size is realized.

In an embodiment, the insulating clamping member 120 further includes an adjusting block 124, and the adjusting block 124 is fixedly connected to the abutting end 1232 of the adjusting rod 123. It will be appreciated that the provision of the adjustment block 124 can further enhance the clamping force of the insulating clamp 120 when clamping different supports.

It can be understood that if the adjusting block 124 directly protrudes from the insulating clamping member 120, it will occupy a portion of the clamping space, resulting in a reduced clamping position size and affecting the clamping effect of the insulating clamping member 120. Therefore, in an embodiment, the insulating clamping member 120 has a clamping surface 125, that is, a surface of the insulating clamping member 120 for clamping the support is recessed inwards to form a receiving groove 126, a bottom wall 1261 of the receiving groove 126 is provided with a first threaded hole, the adjusting rod 123 is threaded to the first threaded hole and extends into the receiving groove, and the adjusting block 124 can be partially received in the receiving groove 126. Therefore, the influence of the adjusting block 124 on the size and the clamping effect of the clamping position can be effectively reduced.

In actual testing operation, after the insulating clamping member 120 fastens the insulating supporting member 110, the fixing direction of the test lead often needs to be changed, and at this time, the insulating clamping member 120 needs to be loosened from the support, then the fixing direction of the insulating supporting member 110 needs to be adjusted, and then the insulating clamping member 120 needs to be fastened to the support. Thus, the operation is complicated, and the test efficiency is low.

Therefore, in an embodiment, the insulating holder has a holding surface 125 and a mounting surface 127 opposite to the holding surface 125, a sliding rail portion 128 is further disposed on the mounting surface 127 of the insulating holder 120, a slider 113 is disposed at one end of the insulating holder 110, and the slider 113 is slidably connected to the sliding rail portion 128, so that the insulating holder 110 is movable relative to the insulating holder 120 along a predetermined track, thereby changing the fixing direction of the insulating holder 110, further realizing fixing the test leads from different directions, and the operation is simple. The two ends of the sliding rail portion 128 are further provided with a limiting block for limiting the moving range of the sliding block 113 on the sliding rail portion 127.

It can be understood that if the test lead is supported only by the insulating support member 110 and there is no other auxiliary fixing mode, the test lead may swing to a larger extent in the case of wind blowing, so that the distance between the test lead and the adjacent phase wire or the cross arm cannot satisfy the effective safety distance, and phase-to-phase and ground faults are easy to occur, which may pose a certain threat to the safety of human body and equipment. In one embodiment, the insulating support 100 further includes an insulating fixing member 130, and the insulating fixing member 130 is detachably connected to the other end of the insulating support 110 for positioning the test lead on the insulating support 110. Therefore, the test lead can be prevented from swinging to a large extent under a severe environment to cause potential safety hazards.

Specifically, the insulating fixing member 130 includes a first fixing member 131, a second fixing member 132, and a third fixing member 133. The second fixing element 132 is detachably connected to the first fixing element 131, the first fixing element 131 and the second fixing element 132 are mutually matched to form a fixing hole 134, and the insulating support 110 is detachably connected to the insulating fixing element 130 through the fixing hole 134. The third fixing member 133 is detachably connected to the second fixing member 132, and the second fixing member 132 and the third fixing member 133 cooperate to form a lead hole 135, wherein the lead hole 135 is used for positioning the test lead on the insulating support member 110.

In some embodiments, the fixing hole 134 may be formed by milling, the shape and size of the fixing hole 134 match those of the insulating support 110, and after the insulating support 110 passes through the fixing hole 134, the insulating support 110 is locked to the insulating support 110 by locking the first fixing member 131 to the second fixing member 132.

The lead hole 135 may also be formed by milling, the shape and size of the lead hole 135 are matched with those of the test lead, and after the test lead passes through the lead hole 135, the test lead is positioned on the insulating support 110 by locking the second fixing member 132 and the third fixing member 133.

In one embodiment, the insulating fixture 130 includes a first fastening unit 136, the second and third fixing members 132 and 133 are respectively provided with second and third threaded holes, and the first fastening unit 136 is threadedly coupled to the second threaded hole of the second fixing member 132 and passes through the second threaded hole of the second fixing member 132 to be threadedly coupled to the third threaded hole of the third fixing member 133. For example, the first fastening unit 136 is a ball-shaped handle bolt, the second fixing member 132 and the third fixing member 133 are respectively provided with a second threaded hole and a third threaded hole which are matched with the ball-shaped handle bolt, and the first fastening unit 136 is threadedly coupled to the second threaded hole of the second fixing member 132 and passes through the second threaded hole of the second fixing member 132 to be threadedly coupled to the third threaded hole of the third fixing member 133, so that the third fixing member 133 can be coupled to or separated from the second fixing member 132. When the third fixing member 133 is connected to the second fixing member 132, a lead hole is formed in cooperation. Specifically, in practical application, the test lead is firstly placed on the second fixing member 132, then the third fixing member 133 is fastened on the second fixing member 132 to form a lead hole, and then the knob bolt is sequentially screwed into the second threaded hole in the second fixing member 132 and the third threaded hole in the third fixing member 133 to connect the second fixing member 132 and the third fixing member 133 and limit the test lead.

In order to further enhance the fixing effect of the insulating fixing member 130 on the test lead, in an embodiment, the insulating fixing member 130 further includes a second fastening unit 137, the third fixing member 133 is further provided with a fourth threaded hole, the fourth threaded hole is communicated with the lead hole 135, the second fastening unit 137 is screwed to the fourth threaded hole of the third fixing member 133, and passes through the fourth threaded hole of the third fixing member 133 to abut against the test lead in the lead hole 135, so as to lock the test lead in the insulating fixing member 130. Specifically, in some embodiments, the second fastening unit 137 may be a wedge of a plum-blossom handle, a fourth threaded hole matched with the wedge of the plum-blossom handle is formed in the third fixing member 133, the fourth threaded hole is communicated with the lead hole 135, and the second fastening unit 137 is in threaded connection with the fourth threaded hole of the third fixing member 133 and passes through the fourth threaded hole of the third fixing member 133 to extend into the lead hole 135 to abut against the test lead. By tightening the second tightening unit 137, a pressing force can be applied to the test lead, so that the test lead can be completely locked in the insulating holder 130. So, can prevent effectively that experimental lead wire from producing and rocking to guarantee the safety of whole test process.

It should be understood that the number of the insulating fixtures 130 should be determined according to the number of the test leads. For example, in order to enable the insulating bracket 100 to fix a plurality of test leads at the same time, in one embodiment, a plurality of insulating fixing members 130 are detachably connected to the insulating support member 110.

When the insulating support 100 is in use, the insulating clamping piece 120 can be fixed on different supports by arranging the adjusting rod 123 and the adjusting block 124, the insulating support 110 is constructed into the first telescopic piece 111 and the second telescopic piece 112 which can be movably connected along the axial direction, so that the insulating support 100 can be suitable for different operation ranges, the insulating fixing piece 130 is provided with the first fastening unit 136 and the second fastening unit 137, a test lead is fixed on the insulating support 110, and the test lead is prevented from shaking to bring potential safety hazards to a human body and equipment.

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