KR101893092B1 - insulator apparatus of high voltage underground distribution line - Google Patents

Abstract

The present invention relates to an insulator device of an extra-high voltage underground distribution line. More specifically, the present invention relates to an insulator device of an extra-high voltage underground distribution line which electrically, easily and simply connects underground distribution lines, can simultaneously protect the underground distribution lines from an external force, can adjust an interval between the underground distribution lines according to situations as needed, and binds a transparent cover to a tube body to prevent the transparent cover from deviating from the tube body while the transparent cover moves according to the external force or movement of a connector fixing port. The insulator device of an extra-high voltage underground distribution line comprises: a protection tube (10); an installation base (20); the connector fixing port (30); a connection member (41); electric wire fixing members (42, 42′); and a connector (40).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to insulator assemblies for high voltage underground distribution lines,

More particularly, the present invention relates to an insulation insulator apparatus for an underground distribution line, and more particularly, to an underground distribution line which can be easily and easily interconnected electrically and at the same time to protect an underground distribution line from an external force, In addition, it is possible to adjust the gap between underground power distribution lines according to the situation, and to insulate the transparent cover from the tube body by bonding the tube to the tube body to prevent the transparent cover from moving due to external force, To an insulator device.

Generally, in the downtown area, the wires are buried in the basement, not on the ground, considering the beauty.

At this time, the cable protection pipe is embedded in the underground so that the electric wire can be protected from the outside, and the underground distribution cable is inserted into the inside thereof.

In case of protecting the underground power distribution line, the underground distribution line is embedded in the underground, and a separate protection cover is installed to protect the protection line.

Korean Patent Registration No. 10-1448730 (Oct. 13, 2014) discloses a 'prefabricated pipe structure capable of adjusting the distance between underground distribution lines'.

However, such a conventional built-in pipe structure capable of adjusting the distance between underground distribution lines has a problem in that the transparent cover moves away from the pipe body due to external force or movement of the connector fixture.

Korea Patent Registration No. 10-1448730 (Oct. 13, 2014) 'Assembly-type pipe structure capable of adjusting the distance between underground distribution lines'

SUMMARY OF THE INVENTION The present invention has been devised to solve the above-mentioned problems, and it is an object of the present invention to provide an underground distribution line that can be easily and easily interconnected electrically and at the same time to protect an underground distribution line from external force, To provide an insulating insulator apparatus for an extra high voltage underground distribution line for preventing a shift of the transparent cover from the tube body while moving the transparent cover according to the external force and the movement of the connector fixture by binding the transparent cover to the tube body will be.

The problems to be solved by the present invention are not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above-mentioned object, the present invention provides a tube body having an inner and an upper surface opened and a guide hole (12a) perpendicular to the tube body (11) (10) having a cover (12): a mounting body (21) having a guide groove (21a) facing the guide hole (12a) and fixed to the inner bottom surface of the tube body (11); (20) having a partition wall (22) spaced apart from each other and formed along the longitudinal direction of the mounting table body (21): a guide portion (31a) movably coupled to the guide groove (21a) A bearing member 32 fixed to the hole of the fixture body 31 and extending vertically from the upper surface of the fixture body 31 and passing through the guide hole 12a of the transparent cover 12, And a stopper nut 34 which is fastened to the handle 33 and presses the transparent cover 12 to limit the movement of the fixture body 31. The stopper nut 34 is provided with a screw hole 33, : Insulation insulator 41a provided with a first fastening portion 41a-1 on the inner circumferential surface at both ends and fixed to the bearing member 32 so as to be rotatable; (41b) composed of a metal pipe (41b) provided with a metal pipe (41b-1); A second fastening part 42a-1 formed on the circumferential surface and fastened to the first fastening part 41a-1; a second fastening part 42a-1 formed integrally on the circumferential surface and bent inward, A wire breakaway preventing portion 42a having an attachment portion 42b-1 and an unevenness 42b-2 on an outer surface and an inner surface of the wire breakaway preventing portion 42a, A wire fixing member (42, 42 ') extending outwardly from one end of the wire detachment prevention portion (42a) and having a wire receiving portion (42b) formed radially with respect to the wire separation preventing portion (42a); And a tie band 43 provided on the seating portion 42b-1 so as to enclose the wire capturing portion 42b and pressing and fixing the underground distribution line L through the wire capturing portion 42b. , The transparent cover 12 is bound to the tube body 11 so that the transparent cover 12 is moved in accordance with the external force and the movement of the connector fixing hole 30 (100), wherein the fixing part (100) comprises: an upper plate (110) provided on both sides of the transparent cover (12); A lower plate 120 provided on both sides of the tube body 11 so as to be positioned below the upper plate 110; And binding means 130 for binding the upper and lower plates 110 and 120. The binding means 130 is connected to the lower and upper plates 120 and 120, A support bar 131; A spring 132 coupled to the outside of the support bar 131 to be positioned between the upper and lower plates 110 and 120; And the upper plate 110 is coupled to the support bar 131 so that the upper plate 110 is coupled to the support bar 131 to prevent both sides of the transparent cover 12 from swinging up and down, And a fastening member 133 for allowing the transparent cover 12 to be separated in accordance with the release of the connection from the transparent cover 131. When the transparent cover 12 is closed when the transparent cover 12 is opened, Characterized in that a shock is absorbed while preventing collision between the transparent cover (12) and the tube body (11) while being contracted by pressing the upper plate (110) before the tube (12) To provide an insulation insulator device for a high voltage underground distribution line.

According to the present invention, firstly, the underground distribution line can be easily and electrically connected easily, which is effective in shortening the working time and the work efficiency.

In particular, since the transparent cover can see the inside of the tube body, the operator can easily check the wiring condition without removing the transparent cover. In addition, The operator can easily move the connector while confirming the connector fixed to the fixture body by using the handle, so that the operation is considerably convenient.

Third, since the screw tabs are formed in the second fastening portions of the wire fastening members in opposite directions to each other, the wire fastening members can be simultaneously released or tightened by turning the connecting member clockwise or counterclockwise, Especially, it is very useful because it can solve the problem of twisting underground distribution lines.

Fourthly, by bonding the transparent cover to the tube body, it is possible to prevent the transparent cover from being moved together with the external force, the movement of the connector fixing port, and the like, and it is also possible to maintain a stable engagement state.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

1 is a perspective view showing an insulation insulator apparatus for an extra-high voltage underground distribution line according to the present invention.
Fig. 2 is an exploded perspective view showing an insulation insulator apparatus for an extra-high voltage underground distribution line according to the present invention.
3 is a plan view showing an insulator insulator of an extra high voltage underground distribution line according to the present invention.
4 is a front view showing an insulation insulator apparatus for an extra-high voltage underground distribution line according to the present invention.
5 is a cross-sectional perspective view showing a main portion in an insulation insulator apparatus of an extra-high voltage underground distribution line according to the present invention.
6 is a state view showing a process of fixing an underground distribution line using a wire fixing member in an insulator insulator of an extra high voltage underground distribution line according to the present invention.
FIG. 7 is a state diagram illustrating a process of connecting an underground distribution line using an insulator insulator of an extra-high voltage underground distribution line according to the present invention.
8 is a front sectional view showing a state in which a fixing part is provided in an insulator insulator of an extra high voltage underground distribution line according to the present invention.
And
9 is a partially enlarged cross-sectional view showing the fixing portion in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And should not be construed as limited to the embodiments described herein.

Since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein.

It should be understood that the embodiments according to the concept of the present invention are not limited to the particular mode of disclosure but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

Since the present invention uses the previously-described prior art 1448730 as it is, the features of the device configuration described below can all be understood as those described in the registered patent No. 1448730. [

However, the present invention is not limited to the structure disclosed in the above-mentioned Japanese Patent No. 1448730, in which the 'assembled pipe line structure capable of adjusting the distance of the underground distribution line' is replaced with 'insulated insulator of underground distribution line' And the description of the operation is further included, and this part constitutes the most essential constitutional feature.

Therefore, the device structure, characteristics, and operation relationship described below will be incorporated by reference in the above-mentioned Japanese Patent No. 1448730, and the structure related to the main features of the present invention will be described in detail at the rear end.

1 to 5, an insulation insulator apparatus for a special high-voltage underground distribution line according to the present invention includes a protection pipe 10, a mounting base 20, a connector fixture 30, and a connector 40, It is installed on the floor of the underground facility (basement) buried in the ground to protect the underground distribution lines (L) electrically from each other and protect them from external force, and adjust the gap between underground distribution lines (L) Very useful.

1 to 4, the protection pipe 10 is composed of a pipe body 11 and a transparent cover 12. In this embodiment, the protection pipe 10 is installed on the floor of an underground facility (basement) (L) to protect against external force.

The tube body 11 is a member having a generally U-shaped shape with its longitudinal and top surfaces opened, and is installed in a line along the bottom of a basement (basement).

The transparent cover 12 is used to cover the opened upper surface of the tube body 11 and has a guide hole 12a at the center thereof perpendicular to the tube body 11.

A handle 33 is inserted into the guide hole 12a, and the guide hole 12a serves to guide the handle 33.

Since the transparent cover 12 can see the inside of the tube body 11, the operator can easily check the wiring state without detaching the transparent cover 12, It is possible to easily move the connector 40 fixed to the body 31 while checking the connector 40, which is advantageous in that the operation is considerably convenient.

The transparent cover 12 is simply placed on the upper surface of the tube body 11 and fixed with the handle 33 and the stopper nut 34 interlocked with each other.

Therefore, the operator does not need to install the transparent cover 12 on the tube body 11 by using a separate fastening means (for example, a screw bolt or the like), which is advantageous in that the pipe installation is considerably convenient.

1 to 4, the mounting table 20 is a member formed by a mounting table body 21 and a partition wall 22. In the present embodiment, the mounting table 20 can be inserted into the protective pipe 10 to install a ground distribution line L It provides the space that is available.

The mounting table body 21 is a plate having a predetermined thickness and is fixed to the inner bottom surface of the tube body 11 through fastening means (for example, screw bolts or the like).

A guide hole 12a of the transparent cover 12 and a guide groove 21a facing each other are integrally formed at the center of the mounting table body 21. The guide groove 21a is formed with a guide hole 21a, (31a) is movably coupled.

The inner middle portion of the guide groove 21a protrudes inward so that the guide portion 31a can move along the longitudinal direction of the guide groove 21a but can be prevented from being detached to the outside, 30 can be fixed.

The partition walls 22 are spaced apart from each other at a predetermined interval on the upper surface of the mounting table body 21 to divide the space so that the ground distribution lines L are not in contact with each other.

1 to 5, the connector fixture 30 includes a fixture body 31, a bearing member 32, a handle 33, and a stopper nut 34. In this embodiment, The connector 40 is movably coupled to the guide groove 21a of the connector 40 to fix the connector 40 while adjusting the position of the connector 40. [

For reference, a plurality of connector fasteners 30 are movably installed on the mounting table 20.

The fixture body 31 has a square shape as a whole and a hole is formed at the center and a guide portion 31a corresponding to the guide groove 21a is provided at a lower end portion of the fixture body 31. In this embodiment, And is movably coupled to the guide groove 21a.

The bearing member 32 is a known member installed in the hole of the fixture body 31, and the connector 40 to be described later is rotatably fixed.

The handle 33 extends vertically from the upper surface of the fixture body 31 and passes through the guide hole 12a of the transparent cover 12 and has a screw tab formed on the peripheral surface thereof.

The operator can easily move the fixture body 31 horizontally through the handle 33 exposed to the outside, which is very useful.

The stopper nut 34 is fastened to the handle 33 and presses the transparent cover 12 to limit the movement of the fixture body 31.

The stopper nut 34 is firmly fastened to the handle 33 so that the guide portion 31a of the fastener body 31 is strongly abutted against the guide groove 21a so that the movement of the fastener body 31 is restricted, Since the transparent cover 12 is pressed by the nut 34, the fixing property of the transparent cover 12 can be also secured.

1 to 6 (b), the connector 40 is an insulating material composed of a connecting member 41, wire fixing members 42 and 42 'and a tie band 43. In this embodiment, And is rotatably fixed to a bearing member 32 provided on the base 31 to electrically connect the underground distribution lines L to each other.

The connecting member 41 is composed of an insulating insulator 41a made of an insulating material and a metal pipe 41b made of a metal material. In this embodiment, the connecting member 41 is fixed to the underground power distribution line 42 L) are electrically connected to each other.

The insulating insulator 41a is a hollow tube and integrally provided with first fastening portions 41a-1 having threaded tabs on the inner circumferential surfaces of both ends thereof. In this embodiment, the insulating fasteners 41a are rotatably supported by the bearing member 32 of the connector fastener 30 So as to fix the wire fixing members 42 and 42 '.

The metal pipe 41b has a fixing protrusion 41b-1 on the inner circumferential surface thereof. In this embodiment, the metal wire of the underground power distribution line L, which is drawn inward in the present embodiment, is fixed through the fixing protrusion 41b- (L) to be electrically connected to each other.

The wire fixing member 42 and 42 'is an insulating material composed of a wire separation preventing portion 42a and a wire receiving portion 42b. In this embodiment, the wire fixing member 42 and 42' are fixed to the underground power distribution line L, (41).

The wire breakaway preventing portion 42a is a hollow tube and has a second fastening portion 42a-1 formed with a threaded tab on its peripheral surface. The second fastening portion 42a-1 is integrally formed on the circumferential surface, And a plurality of departure prevention pieces 42a-2 for preventing the departure of the guide members 42a-2.

The second fastening part 42a-1 is detachably fastened to the first fastening part 41a-1.

When the underground distribution line L is fastened to the first fastening portion 41a-1 with the underground distribution line L being fixed to the wire separation preventing portion 42a, There is a twisted problem.

In order to solve the above problem, it is necessary to note that the screw taps are formed in the second fastening portions 42a-1 of the wire fixing members 42 and 42 'in opposite directions to each other.

Since the screw taps are formed in the second fastening portions 42a-1 of the wire fixing members 42 and 42 'in opposite directions, the connection member 41 is rotated clockwise or counterclockwise, The members 42 and 42 'can be loosened or tightened at the same time, so that the assembling and disassembling are extremely convenient, and in particular, the problem of twisting the underground distribution line L is very useful.

The release preventing piece 42a-2 is formed by cutting the circumferential surface of the wire separation preventing portion 42a into a "C" shape and then bending the incised piece inwardly.

According to the present invention, when the underground distribution line L is inserted into the inside, a plurality of inwardly bent departure prevention pieces 42a-2 extend to allow the underground distribution line L to pass naturally, The underground distribution line L is covered at the end of the departure prevention piece 42a-2, so that the underground distribution line L can be prevented from deviating.

The wire capturing part 42b is formed radially from the one end of the wire separation preventing part 42a and extends outward with respect to the wire separation preventing part 42a. In this embodiment, the underground distribution wire L is inwardly And at the same time, presses and fixes the covering of the underground distribution line (L).

The seating portion 42b-1 and the unevenness 42b-2 are integrally formed on the outer surface and the inner surface of the wire receiving portion 42b.

The tie band 43 is provided on the seat portion 42b-1 to enclose the wire receiving portion 42b and functions to press and fix the underground distribution line L through the wire receiving portion 42b. In the case of this embodiment, as an example, the tie band 43 is applied, but wire may be applied if necessary.

The use state of the present invention constituted as described above will be described.

As shown in FIG. 6 (a), the underground distribution line L is first inserted into the wire fixing members 42 and 42 ', which will be described in more detail. The breakage prevention piece 42a-2 is opened by the underground distribution line L that is led into the inner side and the underground distribution line 42b is covered with the underground distribution line 42b, The tip end is brought into close contact.

6 (b), when the underground distribution line L is inserted into the wire separation preventing portion 42a and the wire receiving portion 42b, the tie band 43 is connected to the wire receiving portion 42b, The wire capturing portion 42b is pinched and the cover of the underground distribution line L is strongly pressed by the projections and depressions 42b-2.

Whereby the underground distribution line L is firmly fixed to the wire fixing members 42 and 42 '.

5 to 7, after the underground distribution line L is fixed to the wire fixing members 42 and 42 'as described above, the wire fixing members 42 and 42' are intermittently The second fastening portions 42a-1 of the wire fixing members 42 and 42 'are formed in opposite directions to each other, and at the same time, And the metal wire portion of the underground distribution line L is drawn into the metal pipe 41b and press-fitted into the fixing protrusion 41b-1.

If the underground distribution line L is damaged, the damaged underground distribution line L may be replaced and reassembled in the reverse order of the previously described method.

In order to adjust the distance of the underground distribution line L installed in the protective pipe 10, the knob 33 is pushed to the left and right in a state in which the stopper nut 34 fastened to the handle 33 is loosened first When the setting is completed, the stopper nut 34 is strongly tightened to prevent the fixing body 31 from moving further.

The present invention can easily and easily connect the ground distribution line (L) electrically, which is considerably effective in shortening the working time and the working efficiency.

Particularly, the transparent cover 12 is made to be able to see the inside of the tube body 11, so that the transparent cover 12 can be separated from the inside of the tube body 11. [ The operator can easily confirm the wiring state without using the handle 33. The operator can easily move the connector 40 fixed to the fixture body 31 by using the handle 33 while checking the connector 40, have.

Since the screw tabs are formed in the second fastening portions 21a of the wire fixing members 42 and 42 'in opposite directions to each other, the wire fixing member 42 , 42 'can be simultaneously loosened or tightened, which is very convenient, especially since it is possible to solve the problem of twisting underground distribution line L.

In the present invention, the transparent cover 12 is fastened to the tube body 11, as shown in Figs. 8 to 9, and the transparent cover 12 The fixing unit 100 is further configured so as to prevent it from moving.

The fixing part 100 is provided with an incomplete coupling state which is generated when the transparent cover 12 is displaced from the tube body 11 due to an external force transmitted from the outside such as an earthquake or the movement of the connector fixing hole 30, A gap is formed between the body 11 and the transparent cover 12 to prevent foreign matter or the like from entering the inside of the protective pipe 10. [

The fixing part 100 includes an upper plate 110 provided on both sides of the transparent cover 12, a lower plate 120 provided on both sides of the tube body 11 so as to be positioned below the upper plate 110, 110 and 120, respectively.

The upper plate 110 has one side connected to both sides of the transparent cover 12 and the other side extending outward.

The lower plate 120 is provided on both sides of the tube body 11 so as to face the upper plate 110 in the same manner as the upper plate 110.

The binding means 130 binds both sides of the transparent cover 12 to both sides of the tube body 11 while preventing the transparent cover 12 from moving due to an external force or the like.

The binding means 130 is connected to the lower plate 120 and the upper portion of the binding means 130 is formed to extend upward so as to be positioned between the support bars 131 and upper and lower plates 110 and 120 passing through the upper plate 110, And a fastening member 133 coupled to the support bar 131 so as to be positioned on the top of the upper plate 110.

A hollow (111) through which the upper portion of the support bar (131) passes is formed in the upper plate (110).

It is preferable that the support bar 131 is formed with threads on the outer circumferential surface thereof and the fastening member 133 is formed by a nut or the like which forms a thread on the inner circumferential surface and is screwed to the outside of the support bar 131.

The fastening member 133 is coupled to the support bar 131 to fasten the upper plate 110 to the support bar 131 to block the swing of the transparent cover 12, So that the transparent cover 12 can be separated. Here, disengagement of the fastening member 133 can be understood as separation from the support bar 131. [

That is, when the transparent cover 12 is closed, the fastening member 133 is coupled to the support bar 131 while the transparent cover 12 is seated on the upper portion of the tube body 11, (131) to prevent the transparent cover (12) from shaking.

On the contrary, when the transparent cover 12 is opened, the fastening member 133 can be rotated from the support bar 131 to the transparent cover 12.

When the transparent cover 12 is closed while the transparent cover 12 is opened, the spring 132 is contracted by the pressure of the top plate 110 before the transparent cover 12 contacts the tubular body 11, Thereby preventing the collision between the bodies 11, while cushioning the impact.

When the transparent cover 12 is opened when the transparent cover 12 is closed, the spring 132 is loosened according to the disengagement of the fastening member 133 so that the transparent cover 12 is opened to some extent with the tube body 11, So that it can be smoothly performed.

The spring 232 urges the tubular body 11 together with the transparent cover 12 while buffering the impact in accordance with the vertical movement of the transparent cover 12 according to the state in which the fastening member 133 is incompletely bound to the support bar 131. [ It is possible to prevent damage to the apparatus.

The fixing unit 100 may further include a non-slip pad 140 provided under the upper plate 110.

The anti-slip pad 140 may be made of silicone or rubber to prevent slippage of the spring 132 while preventing noise from being caused by contact between the spring 132 and the upper plate 110.

The binding means 130 is screwed to the support bar 131 so as to be positioned between the lower plate 120 and the spring 132 and is lifted and lowered according to the rotation to adjust the elastic force of the spring 132, As shown in FIG.

The elastic force adjusting member 134 is raised and lowered in the longitudinal direction of the support bar 131 in accordance with the rotation and appropriately adjusts the elastic force of the spring 132 while adjusting the degree of pressing of the spring 132 to the upper plate 110 .

The elastic force adjusting member 134 is preferably formed with a lead-in groove 134a through which a lower portion of the spring 132 is inserted.

The lead-in groove 134a prevents the spring 132 from being detached from the elastic force adjusting member 134 while the lower portion of the spring 132 is being drawn.

The fixing part 100 can prevent the transparent cover 12 from moving due to external force or the movement of the connector fixing part 30 by binding the transparent cover 12 to the tube body 11. [

10: protective tube 11: tube body
12: transparent cover 20: mounting table
21: mounting table body 22:
30: connector fixture 31: fixture body
32: bearing member 33: handle
34: Stopper nut 40: Connector
41: connecting member 42, 42 ': wire fixing member
43: tie band 100:
110: top plate 111: hollow
120: lower plate 130: binding means
131: support bar 132: spring
133: fastening member 134: elastic force adjusting member
140: Non-slip pad

Claims (1)

A protective tube (10) having a tube body (11) having an inner and an upper surface opened, and a transparent cover (12) having a guide hole (12a) perpendicular to the tube body (11) and covering the upper surface of the tube body (11)
A mounting body 21 having a guide groove 21a facing the guide hole 12a and fixed to the inner bottom surface of the tube body 11; (20) having a partition wall (22) spaced apart from one another and formed along the longitudinal direction of the installation table body (21)
A fixture body 31 having a guide portion 31a movably coupled to the guide groove 21a and having a hole formed at the center thereof, a bearing member 32 fixed to the hole of the fixture body 31, A handle 33 extending vertically from the upper surface of the transparent cover 12 and passing through the guide hole 12a of the transparent cover 12 and having a screw tab formed on the peripheral surface thereof, And a stopper nut (34) for restricting the movement of the fixture body (31) by pressing the connector fixture (30):
(41a) having a first fastening portion (41a-1) on the inner circumferential surface at both ends and being rotatably fixed to the bearing member (32), a plurality of fastening protrusions A connecting member 41 composed of a metal tube 41b provided with a plurality of metal tubes 41b-1;
A second fastening part 42a-1 formed on the circumferential surface and fastened to the first fastening part 41a-1; a second fastening part 42a-1 formed integrally on the circumferential surface and bent inward, A wire breakaway preventing portion 42a having an attachment portion 42b-1 and an unevenness 42b-2 on an outer surface and an inner surface of the wire breakaway preventing portion 42a, A wire fixing member (42, 42 ') extending outwardly from one end of the wire detachment prevention portion (42a) and having a wire receiving portion (42b) formed radially with respect to the wire separation preventing portion (42a); And
And a tie band 43 provided on the seating portion 42b-1 so as to enclose the wire capturing portion 42b and pressing and fixing the underground distribution line L through the wire capturing portion 42b: Wherein the insulated insulator apparatus comprises:
Further comprising a fixing part (100) for binding the transparent cover (12) to the tube body (11) and preventing the transparent cover (12) from moving due to external force or movement of the connector fixing hole (30)
The fixing unit 100,
An upper plate 110 provided on both sides of the transparent cover 12;
A lower plate 120 provided on both sides of the tube body 11 so as to be positioned below the upper plate 110; And
And binding means (130) for binding the upper and lower plates (110, 120)
The binding means (130)
A support bar 131 connected to the lower plate 120 and having an upper portion extending upwardly and passing through the upper plate 110;
A spring 132 coupled to the outside of the support bar 131 to be positioned between the upper and lower plates 110 and 120; And
The upper plate 110 is coupled to the support bar 131 so that both sides of the transparent cover 12 are prevented from swinging up and down while being coupled to the support bar 131 so as to be positioned above the upper plate 110, And a fastening member (133) for allowing the transparent cover (12) to be separated in accordance with the disengagement of the transparent cover (12)
The spring 132,
The transparent cover 12 is contracted by the pressure of the upper plate 110 before the transparent cover 12 is brought into contact with the tube body 11 and the gap between the transparent cover 12 and the tube body 11 Characterized in that a shock is buffered while preventing collision.

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