Underground distribution line support tray device enabling easy inspection of underground distribution

Abstract

The present invention relates to an underground distribution line support tray device enabling easy inspection of an underground distribution, the underground distribution line support tray device comprising: a pair of side rails (10, 10'); multiple rungs (20); a connection ring (30); a holder (40); a pair of driving assemblies (50, 50'); a fence (60); a support rod (70); and circuit units (80, 80'), wherein a pair of circuit units (80, 80') include a driving circuit module (C) which is electrically connected in parallel to the circuit units so that electricity is selectively conducted according to the operation of a selection switch (SW), a holder capable of moving a position is installed on the rung of the tray device so that a field worker can conveniently work without interference by easily mounting his / her mobile device in a desired position for the purpose of repairing and managing an underground distribution line, related equipment, a tray device, etc., and the field worker can pass through the tray device through a space by moving the position of the rung along the side rail and securing the space, so that the field worker can manually work while visually viewing the underground distribution line placed on the tray device without an extra space in a power tunnel.

Description

Underground distribution line support tray device that makes it easy to check the underground distribution status

[0001] The present invention relates to an underground distribution line support tray mechanism that facilitates inspection of the underground distribution status.

[0002] High-voltage electricity transmitted from power plants or substations is transformed into a certain voltage and then distributed to consumption areas. This distribution is done through overhead lines or underground lines.

[0003] In areas where constructing overhead lines using overhead power lines is technically impractical, aesthetically pleasing, or maintenance is difficult, underground lines are typically constructed using underground cables. In particular, underground lines are being installed in locations where overhead lines are concentrated, such as near substations and high-rise buildings with high load density, where multi-circuit configurations are difficult to secure supply capacity.

[0004] The underground power line wiring method was usually done by burying underground pipes, but due to management difficulties, the method of installing underground power lines (hereinafter referred to as 'underground distribution lines') using power trenches has been widely used recently, and the underground distribution lines installed in power trenches are laid in tray devices installed in the power trenches.

[0005] As a prior art for laying underground distribution lines using such a tray device, there is Korean Patent No. 10-1927805, which discloses a technology for easily and conveniently connecting underground distribution lines.

[0006] However, since underground distribution cables laid on trays in power trenches are usually installed in high locations that are difficult for field workers to access, there had to be ample space on the side of the trays for field workers to inspect and replace the underground distribution cables resting on the trays. Ultimately, even though power trenches can accommodate additional trays, there was an unreasonable situation where trays could not be installed due to the aforementioned ample space, or where it was necessary to install additional trays, a relatively large-sized power trench had to be installed underground.

[0007] Meanwhile, field workers, in order to maintain underground distribution lines and related equipment, carry mobile devices such as laptops or tablets with network communication capabilities. These devices can be used to check the distribution status of the underground distribution lines, control electrical switching, and record other work records. Consequently, field workers who climbed to elevated platforms for maintenance and other tasks often faced significant inconvenience due to the lack of a means to secure their mobile devices.

[0008] Accordingly, the present invention is intended to solve the above-mentioned problem, and the problem to be solved is to provide an underground distribution line support tray mechanism that allows field workers to easily place their mobile devices in a desired location and work conveniently without interference for the purpose of maintaining and managing underground distribution lines and related equipment and tray mechanisms, and at the same time, allows field workers to visually inspect underground distribution lines placed on a tray mechanism and perform work manually without requiring any extra space in a power line, thereby making it easy to check the underground distribution status.

[0009] In order to achieve the above task, the present invention,

[0010] A pair of side rails (10, 10') are formed along the upper and lower edges, respectively, and are spaced apart from each other and facing each other.

[0011] The two ends are each fixed to a pair of side rails (10, 10'), a rail groove (21) is formed along the longitudinal direction on the lower surface, and a plurality of rungs (20) are arranged parallel and spaced apart from each other along the longitudinal direction of the side rails (10, 10').

[0012] A connecting ring (30) in which the upper part is connected to be movable along the rail home (21) and a first hook (31) opened upward is formed in the lower part;

[0013] A stand (40) having a first hook (31) and a second hook (41) that is detachably opened downwards formed at the upper end, a protruding support (42) formed at the lower end to support the lower end of the mobile (MO), and a stopper (43) formed to support the upper end of the mobile (MO) so that it does not tilt and is mounted so that it can move up and down.

[0014] A ball screw (51) rotatably mounted parallel to the lower flange (11) of the side rail (10, 10'); a motor (52) that generates power for forward and reverse rotation of the ball screw (51); A ball screw (51) is formed by a nut hole (53a) that is slidably engaged with a spiral through which the ball screw (51) passes, and a lower surface (F) facing the lower flange (11) to slide is formed by a pair of pressure surfaces (531, 531') arranged adjacent to each other, and the pair of pressure surfaces (531, 531') are symmetrically inclined to pressurize the lower flange (11) by rotating a certain angle in the direction of rotation of the ball screw (51) due to rotational friction between the ball screw (51) and the nut hole (53a), and a pair of positive and negative rotation piezoelectric elements (532, 532') that generate an electric signal when pressing are attached to each of the pair of pressure surfaces (531, 531'), and a mover (53) having a rotating shaft (533) formed protrudingly on the upper surface; and a pair of side rails (10, 10') A pair of drive assemblies (50, 50') arranged facing each other in each,

[0015] A fence (60) mounted on the lower flange (11) so as to cover and be arranged parallel to the ball screw (51) to prevent the mover (53) from rotating beyond the above-mentioned predetermined angle and to prevent external interference with the mover (53).

[0016] A rod body (71) in which a plurality of pipes (711, 712, 713) of different diameters are coaxially overlapped and flexibly connected to each other so that they can be drawn in and out; a rotating shaft (533) in which both ends of the rod body (71) are respectively connected to a pair of drive assemblies (50, 50') and a rotating ring (721) connected so as to be able to be raised and lowered and to be rotated idle; and a connecting member (72) having a hinge (722) configured to be folded or unfolded according to the raising and lowering; and a flexible support rod (70); and

[0017] A first circuit (81) in which a first forward rotation switch (811) and a first reverse rotation switch (812) are electrically connected in series with a motor (52, 52') as the center, and a first light-emitting switch (813) and a forward rotation lamp (814) connected in series and operated by an electric signal of a forward rotation piezoelectric element (532) are electrically connected in parallel between the first forward rotation switch (811) and the first reverse rotation switch (812); A second circuit (82) is formed by electrically connecting a second forward rotation switch (821) and a second reverse rotation switch (822) in series with a motor (52, 52') as the center, and a second light-emitting switch (823) and a reverse rotation lamp (824) connected in series and operated by an electric signal of a reverse rotation piezoelectric element (532'), and electrically connecting them in parallel between the second forward rotation switch (821) and the second reverse rotation switch (822); wherein the first and second forward rotation switches (811, 821) and the first and second reverse rotation switches (812, 822) perform opening and closing operations as one unit, respectively, and the first circuit (81) and the second circuit (82) are electrically connected in parallel with a motor (52, 52') as the center to form a circuit portion (80, 80'); A pair of circuit parts (80, 80') are electrically connected in parallel, and a driving circuit module (C) is provided so that power is selectively supplied depending on the operation of a selection switch (SW).

[0018] It is an underground distribution line support tray device that makes it easy to check the underground distribution status, including .

[0019] The present invention as described above has a movable stand installed on the rung of the tray mechanism, so that a field worker can easily place his / her mobile phone at a desired location for the purpose of maintaining and managing underground distribution lines, related equipment, and the tray mechanism, and conveniently work without interference, and since the position of the rung is moved along the side rail to secure space so that the field worker can pass through the tray mechanism through the space, there is an effect that the field worker can manually work while visually viewing the underground distribution lines placed on the tray mechanism without having to leave any extra space in the power line.

[0020] Figure 1 is a perspective view showing the installation of a tray mechanism according to the present invention.

[0021] Figure 2 is a cross-sectional view schematically illustrating an example of a normal cross-section of a side rail configured in a tray mechanism according to the present invention.

[0022] Figure 3 is a side cross-sectional view showing the installation of a stand configured in a tray mechanism according to the present invention.

[0023] Figure 4 is a perspective view of the bottom surface of the holder configured in the tray mechanism according to the present invention,

[0024] Figure 5 is a perspective view showing the appearance of the above stand,

[0025] FIG. 6 is a circuit diagram schematically illustrating an example of a circuit for driving a driving assembly configured in a tray mechanism according to the present invention.

[0026] Figures 7 and 8 are plan views showing the operation of the support bar according to the driving of the above driving assembly.

[0027] Figure 9 is a cross-sectional view schematically illustrating another embodiment of a normal cross-section of a side rail configured in a tray mechanism according to the present invention.

[0028] FIG. 10 is a circuit diagram schematically illustrating another embodiment of a circuit part for driving a driving assembly configured in a tray mechanism according to the present invention.

[0029] Fig. 11 is a bottom perspective view of a tray mechanism according to the present invention.

[0030]

[0031] < Drawing symbol >

[0032] 10, 10': Side rail 20: Lung

[0033] 30: Link 31: First Hook

[0034] 40: Stand 41: Second hook

[0035] 42: Pedestal 43: Stopper

[0036] 50, 50': Drive assembly 51: Ball screw

[0037] 52, 52': Motor 53; Mover

[0038] 60: Fence 70: Support bar

[0039] 71: Rod body 72: Connector

[0040] 80, 80': Circuit section 81: First circuit

[0041] 82: 2nd Circuit

[0042] The terms used in the examples are selected from widely used, current terms, taking into account the functions of the present invention. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in certain cases, the applicant may arbitrarily select terms, and in such cases, their meanings will be described in detail in the description of the relevant invention. Therefore, the terms used in the present invention should not be defined simply as names, but rather based on the meanings of the terms and the overall content of the present invention.

[0043]

[0044] Hereinafter, the present invention will be described in detail based on the attached drawings.

[0045] Fig. 1 is a perspective view showing the installation of a tray mechanism according to the present invention, Fig. 2 is a cross-sectional view schematically showing an example of a normal cross-section of a side rail configured in a tray mechanism according to the present invention, and Fig. 3 is a side cross-sectional view showing the installation of a stand configured in a tray mechanism according to the present invention.

[0046]

[0047] Referring to FIGS. 1 to 3, a tray mechanism according to the present invention includes a pair of side rails (10, 10') which are spaced apart from each other and face each other along the upper and lower edges, and a plurality of rungs (20) which are spaced apart from each other along the length direction of the side rails (10, 10'). In the present embodiment, the rungs (20) are each fixed at both ends to the pair of side rails (10, 10'), and a rail groove (21) is formed on the lower surface along the length direction. The tray mechanism including the side rails (10, 10') and the rungs (20) is suspended by a hanger which is composed of a support (B) which simultaneously supports the pair of side rails (10, 10'), and an anchor line (A) which has a lower end connected to the support (B) and an upper end fixed to a ceiling or a high-rise structure.

[0048] In addition, the tray mechanism according to the present invention includes a connecting ring (30) having a first hook (31) formed at a lower end and open upwardly so as to be movable along a rail groove (21), a second hook (41) formed at an upper end and open downwardly so as to be detachable from the first hook (31), a protruding support (42) formed at a lower end so as to support the lower end of the mobile (MO), and a stand (40) formed with a stopper (43) that supports the upper end of the mobile (MO) so as not to tilt and is movable up and down. Accordingly, a field worker can adjust the position by moving the connecting ring (30) along the rail groove (21), and can detachably hook the second hook (41) of the stand (40) to the first hook (31) of the connecting ring (30), so that the field worker can adjust the position of the mobile (MO) and use it according to the field situation. When work is finished, the stand (40) can be separated from the connecting ring (30), so that work interference and aesthetic damage caused by the stand (40) can be reduced. Generally, the mobile (MO) is in the form of a panel, such as a cell phone, PDA, laptop, or notebook, and accordingly, the stand (40) includes a support (42) at the bottom to support the mobile (MO) so that the mobile (MO) stands upright, and a stopper (43) at the top to cover the upper surface of the mobile (MO). However, since the height of the mobile (MO) varies depending on the type, the stopper (43) is mounted so that it can be adjusted up and down according to the height of the mobile (MO). This will be described with reference to the drawings below.

[0049]

[0050] Fig. 4 is a perspective view showing the bottom of a stand configured in a tray mechanism according to the present invention in an exploded manner, and Fig. 5 is a perspective view showing the appearance of the stand.

[0051]

[0052] Referring to FIGS. 3 to 5, the holder (40) of the tray mechanism according to the present invention has rails (44) formed vertically, and a stopper (43) protrudes parallel to the support (42) by penetrating the rail (44). The stopper (43) forms a catch (43a) that protrudes laterally for movable connection with the rail (44). Consequently, the stopper (43) penetrating the rail (44) forms a movable connection without detachment by the catch (43a) formed at one end.

[0053] The other end of the stopper (43) is bent downward in a hook shape so that the upper end of the mobile (MO) is supported without tilting, and the lower end is secured to a support (42) whose end is bent upward in a hook shape so that it is supported without coming off due to sliding, so that the field worker can stably place the mobile (MO) on the stand (40) to perform field work, and can stably operate the mobile (MO) without it falling. In addition, since the stopper (43) can be easily adjusted in height, the field worker can directly place the mobile (MO) on the stand (40) regardless of the type of mobile (MO) he or she uses.

[0054] In this embodiment, the connecting ring (30) for detachably hanging and suspending the stand (40) is formed with a catch (32) at the top so as to be movably engaged with the rail groove (21) of the rung (20). Accordingly, the connecting ring (30) is inserted into and connected to the rail groove (21) by the catch (32) formed in the shape of a 'T', and through this, the connecting ring (30) moves along the longitudinal direction of the rung (20), enabling the position of the stand (40) to be adjusted.

[0055]

[0056] FIG. 6 is a circuit diagram schematically illustrating an example of a circuit part for driving a driving assembly configured in a tray mechanism according to the present invention, and FIGS. 7 and 8 are plan views illustrating the operation of a support bar according to the driving of the driving assembly.

[0057]

[0058] Referring to FIGS. 1 to 2 and 6 to 8, the tray mechanism according to the present invention further includes a pair of drive assemblies (50, 50') that drive a support rod (70) corresponding to a rung (20) to move along a side rail (10, 10'), a fence (60) that prevents a mover (53) formed on the drive assemblies (50, 50') from moving away from the movable body and from external interference, a support rod (70) each of which is connected at both ends to a pair of drive assemblies (50, 50'), and a drive circuit module (C) designed to operate the drive assemblies (50, 50') according to the operation of a field worker.

[0059] To explain each configuration in more detail, the fence (60) is mounted on the lower flange (11) so as to cover and be arranged parallel to the ball screw (51) to prevent the mover (53) from rotating beyond the above-described angle and to prevent external interference with the mover (53). Accordingly, the fence (60) prevents the rotation of the mover (53) according to the rotation of the ball screw (51) and blocks the underground distribution line (not shown) placed on the rung (20) and the support rod (70) from approaching the mover (53) and the ball screw (51).

[0060] The drive assembly (50, 50') comprises: a ball screw (51) rotatably mounted parallel to the lower flange (11) of the side rail (10, 10'); a motor (52) that generates power for forward and reverse rotation of the ball screw (51); A ball screw (51) is formed by a nut hole (53a) that is slidably engaged with a spiral through which the ball screw (51) passes, and a lower surface (F) facing the lower flange (11) to slide is formed by a pair of pressure surfaces (531, 531') arranged adjacent to each other, and the pair of pressure surfaces (531, 531') are symmetrically inclined to pressurize the lower flange (11) by rotating a certain angle in the direction of rotation of the ball screw (51) due to rotational friction between the ball screw (51) and the nut hole (53a), and a pair of positive and negative rotation piezoelectric elements (532, 532') that generate an electric signal when pressing are attached to each of the pair of pressure surfaces (531, 531'), and a mover (53) having a rotating shaft (533) formed protrudingly on the upper surface; and a pair of side rails (10, 10') They form a pair that are arranged facing each other. That is, since the ball screw (51) having a spiral formed around its circumference slidably penetrates the nut hole (53a) of the mover (53), the ball screw (51) rotates forward or backward depending on the rotation direction by the power of the motor (52) to move the mover (53). To this end, one end of the ball screw (51) is connected to be linked with the rotation axis (not shown) of the motor (52), and the other end is rotatably connected to the rotation shaft (54) installed on the lower flange (11).

[0061] Meanwhile, a pair of drive assemblies (50, 50') are installed on the lower flanges (11) of the side rails (10, 10') facing each other, and are arranged to face each other, so that when the rotational axes of the motors (52) rotate in the same direction, the support rod (70) moves parallel to the rung (20) as shown in FIG. 7. In contrast, when the motor (52) of the drive assembly (50) installed on one side rail (10) rotates in the forward direction and the motor of the drive assembly (50') installed on the other side rail (10') does not operate or rotates in the reverse direction, the support rod (70) moves in an inclined position as shown in FIG. 8 with respect to the position of the rung (20). For reference, in this embodiment, the lower surface (F) of the mover (53) is in contact with the lower flange (11), so it maintains its posture without rotating itself even when the ball screw (51) rotates and moves slidably along the lower flange (11).

[0062] The flexible support rod (70) comprises a rod body (71) in which a plurality of pipes (711, 712, 713) having different diameters are coaxially overlapped and flexibly connected to each other so that they can be drawn in and out; a rotary ring (721) connected to a rotary shaft (533) so that both ends of the rod body (71) are respectively connected to a pair of drive assemblies (50, 50') so that they can be raised and lowered and rotated; and a connecting member (72) configured with a hinge (722) so that it can be folded or unfolded according to the raising and lowering. Accordingly, the connecting member (72) rotates around the rotary shaft (533) of the moving member (53) according to the movement of the moving member (53), and the posture of the rod body (71) is adjusted accordingly. When the posture of the support bar (70) is parallel to the rung (20), the length of the bar body (71) is the shortest, whereas when the posture of the support bar (70) is inclined with respect to the rung (20), the length of the bar body (71) increases as the angle of inclination increases. Accordingly, a plurality of coaxially overlapped pipes (711, 712, 713) form a mutually extending motion.

[0063] The driving circuit module (C) is a first circuit (81) in which a first forward rotation switch (811) and a first reverse rotation switch (812) are electrically connected in series with a motor (52, 52') as the center, and a first light-emitting switch (813) and a forward rotation lamp (814) connected in series and operated by an electric signal of a forward rotation piezoelectric element (532) are electrically connected in parallel between the first forward rotation switch (811) and the first reverse rotation switch (812); A second circuit (82) is formed by electrically connecting a second forward rotation switch (821) and a second reverse rotation switch (822) in series with a motor (52, 52') as the center, and a second light-emitting switch (823) and a reverse rotation lamp (824) connected in series and operated by an electric signal of a reverse rotation piezoelectric element (532'), and electrically connecting them in parallel between the second forward rotation switch (821) and the second reverse rotation switch (822); wherein the first and second forward rotation switches (811, 821) and the first and second reverse rotation switches (812, 822) perform opening and closing operations as one unit, respectively, and the first circuit (81) and the second circuit (82) are electrically connected in parallel with a motor (52, 52') as the center to form a circuit portion (80, 80'); A pair of circuit parts (80, 80') are electrically connected in parallel so that electricity is selectively supplied depending on the operation of a selection switch (SW). Therefore, a field worker can control the operation of the drive assembly (50, 50') by operating the operation board (CP) mounted on the outer surface of the side rail (10'). To explain this in more detail, the drive circuit module (C) has a circuit part (80) dedicated to the drive assembly (50) installed on one side rail (10) and a circuit part (80') dedicated to the drive assembly (50') installed on the other side rail (10') electrically connected in parallel, and electricity is supplied by the selection switch (SW). Therefore, a field worker can select one of the pair of drive assemblies (50, 50') to be operated by operating the selection switch (SW) installed on the operation board (CP).Next, the field worker operates the first and second forward rotation switches (811, 821) and the first and second reverse rotation switches (812, 822) installed on the control board (CP) to operate the motors (52, 52') of the corresponding drive assemblies (50, 50'). Since the first and second forward rotation switches (811, 821) and the first and second reverse rotation switches (812, 822) operate as one unit, when the field worker operates one switch on the control board (CP), the first and second forward rotation switches (811, 821) and the first and second reverse rotation switches (812, 822) operate together. In this embodiment, in order to perform the integrated operation of the first and second forward rotation switches (811, 821) and the first and second reverse rotation switches (812, 822), a forward rotation actuator dedicated to the first and second forward rotation switches (811, 821) and a reverse rotation actuator dedicated to the first and second reverse rotation switches (812, 822) are configured as switches on the operation board (CP), so that when a field worker operates the forward rotation actuator, the first and second forward rotation switches (811, 821) operate simultaneously, and when he operates the reverse rotation actuator, the first and second reverse rotation switches (812, 822) operate simultaneously. Since the technology of operating two or more switches with one switch is already a known technology, a detailed description thereof is omitted.

[0064] In this embodiment, when a field worker operates a selection switch (SW) as shown in FIG. 6 to apply power to a dedicated circuit unit (80) of a drive assembly (50) installed on one side rail (10), and operates the first and second reverse rotation switches (812, 822), the current of the DC power supply (V) flows to the left with respect to the motor (52) to induce reverse rotation. However, although not shown, when a field worker operates the first and second forward rotation switches (811, 821), the current of the DC power supply (V) flows to the right with respect to the motor (52) to induce forward rotation.

[0065]

[0066] FIG. 9 is a cross-sectional view schematically illustrating another embodiment of a normal cross-section of a side rail configured in a tray mechanism according to the present invention, FIG. 10 is a circuit diagram schematically illustrating another embodiment of a circuit part for driving a drive assembly configured in a tray mechanism according to the present invention, and FIG. 11 is a bottom perspective view of a tray mechanism according to the present invention.

[0067]

[0068] Referring to FIGS. 7 to 11, the lower surface (F) of the mover (53) is formed by a pair of pressure surfaces (531, 531') arranged adjacent to each other, and the pair of pressure surfaces (531, 531') are symmetrically inclined to pressurize the lower flange (11) by rotating a certain angle in the rotational direction of the ball screw (51) due to the rotational friction between the ball screw (51) and the nut hole (53a). Therefore, as shown in drawing (b) of FIG. 9, when the ball screw (51) rotates counterclockwise, the mover (53) rotates counterclockwise due to friction with the ball screw (51), and the pressure surface (531) located on the left presses the lower flange (11). Here, a pair of pressure surfaces (531, 531') are each attached with a forward-rotating piezoelectric element (532) and a reverse-rotating piezoelectric element (532'), so that when the pressure surface (531) located on the left applies pressure as shown in drawing (b) of FIG. 9, the forward-rotating piezoelectric element (532) attached on the left receives pressure and generates an electric signal.

[0069] Meanwhile, as described above, in order to prevent the rod body (71) from bending during the process of rotating the mover (53), the connecting member (72) is configured with a rotating shaft (533) and a rotating ring (721) that is connected so that both ends of the rod body (71) can be raised and lowered and rotate freely, and a hinge (722) that folds or unfolds according to the raising and lowering. Accordingly, as shown in drawing (B) of FIG. 9, when the mover (53) rotates counterclockwise, the rotating ring (721) descends from the rotating shaft (533), the hinge (722) rotates the rotating ring (721) counterclockwise, and the rod body (71) receives tension and becomes longer. In contrast, when the mover (53) rotates clockwise, the rotary ring (721) rises from the rotary shaft (533), the hinge (722) causes the rotary ring (721) to rotate clockwise, and the rod body (71) contracts under pressure.

[0070] The first circuit (81) comprises a first light-emitting switch (813) and a forward rotation lamp (814) connected in series, which operate with an electric signal from a forward rotation piezoelectric element (532), and are electrically connected in parallel between the first forward rotation switch (811) and the first reverse rotation switch (812). In addition, the second circuit (82) comprises a second light-emitting switch (823) and a reverse rotation lamp (824) connected in series, which operate with an electric signal from a reverse rotation piezoelectric element (532'), and are electrically connected in parallel between the second forward rotation switch (821) and the second reverse rotation switch (822). Accordingly, when the field worker operates the first and second forward rotation switches (811, 821) and the mover (53) rotates as shown in drawing (b) of FIG. 9 to apply pressure to the forward rotation piezoelectric element (532), the forward rotation piezoelectric element (532) generates an electric signal to operate the first light-emitting switch (813) to close, and the forward rotation lamp (814) lights up due to the current flowing by the closing of the first light-emitting switch (813). In this embodiment, the forward rotation lamps (814, 824) and the reverse rotation lamps (814', 824') configured in each circuit unit (80, 80') are installed on the bottom of the corresponding side rails (10, 10'), so that the field worker can visually check the driving status of the drive assembly (50, 50') even from under the tray mechanism.

[0071]

[0072] Although the detailed description of the present invention described above has been described with reference to preferred embodiments of the present invention, it will be understood by those skilled in the art or having ordinary knowledge in the art that various modifications and changes can be made to the present invention without departing from the spirit and technical scope of the present invention as set forth in the claims to be described later.

Claims

1. A pair of side rails (10, 10') are formed along the upper and lower edges, respectively, and are spaced apart from each other and facing each other. The two ends are each fixed to a pair of side rails (10, 10'), a rail groove (21) is formed along the longitudinal direction on the lower surface, and a plurality of rungs (20) are arranged parallel and spaced apart from each other along the longitudinal direction of the side rails (10, 10'). A connecting ring (30) in which the upper part is connected to be movable along the rail home (21) and a first hook (31) opened upward is formed in the lower part; A stand (40) having a first hook (31) and a second hook (41) that is detachably opened downwards formed at the upper end, a protruding support (42) formed at the lower end to support the lower end of the mobile (MO), and a stopper (43) formed to support the upper end of the mobile (MO) so that it does not tilt and is mounted so that it can move up and down. A ball screw (51) rotatably mounted parallel to the lower flange (11) of the side rail (10, 10'); a motor (52) that generates power for forward and reverse rotation of the ball screw (51); A ball screw (51) is formed by a nut hole (53a) that is slidably engaged with a spiral through which the ball screw (51) passes, and a lower surface (F) facing the lower flange (11) to slide is formed by a pair of pressure surfaces (531, 531') arranged adjacent to each other, and the pair of pressure surfaces (531, 531') are symmetrically inclined to pressurize the lower flange (11) by rotating a certain angle in the direction of rotation of the ball screw (51) due to rotational friction between the ball screw (51) and the nut hole (53a), and a pair of positive and negative rotation piezoelectric elements (532, 532') that generate an electric signal when pressing are attached to each of the pair of pressure surfaces (531, 531'), and a mover (53) having a rotating shaft (533) formed protrudingly on the upper surface; and a pair of side rails (10, 10') A pair of drive assemblies (50, 50') arranged facing each other in each, A fence (60) mounted on the lower flange (11) so as to cover and be arranged parallel to the ball screw (51) to prevent the mover (53) from rotating beyond the above-mentioned predetermined angle and to prevent external interference with the mover (53). A rod body (71) in which a plurality of pipes (711, 712, 713) of different diameters are coaxially overlapped and flexibly connected to each other so that they can be drawn in and out; a rotating shaft (533) in which both ends of the rod body (71) are respectively connected to a pair of drive assemblies (50, 50') and a rotating ring (721) connected so as to be able to be raised and lowered and to be rotated idle; and a connecting member (72) having a hinge (722) configured to be folded or unfolded according to the raising and lowering; and a flexible support rod (70); and A first circuit (81) in which a first forward rotation switch (811) and a first reverse rotation switch (812) are electrically connected in series with a motor (52, 52') as the center, and a first light-emitting switch (813) and a forward rotation lamp (814) connected in series and operated by an electric signal of a forward rotation piezoelectric element (532) are electrically connected in parallel between the first forward rotation switch (811) and the first reverse rotation switch (812); A second circuit (82) is formed by electrically connecting a second forward rotation switch (821) and a second reverse rotation switch (822) in series with a motor (52, 52') as the center, and a second light-emitting switch (823) and a reverse rotation lamp (824) connected in series and operated by an electric signal of a reverse rotation piezoelectric element (532'), and electrically connecting them in parallel between the second forward rotation switch (821) and the second reverse rotation switch (822); wherein the first and second forward rotation switches (811, 821) and the first and second reverse rotation switches (812, 822) perform opening and closing operations as one unit, respectively, and the first circuit (81) and the second circuit (82) are electrically connected in parallel with a motor (52, 52') as the center to form a circuit portion (80, 80'); A pair of circuit parts (80, 80') are electrically connected in parallel, and a driving circuit module (C) is provided so that power is selectively supplied depending on the operation of a selection switch (SW). An underground distribution line support tray device that is easy to check the underground distribution status, characterized by including:

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