High-elevation work vehicle

Abstract

The present invention relates to a high-elevation work vehicle used for work performed at high elevations. The high-elevation work vehicle according to the present invention comprises: a vehicle having a stage; and a high-elevation work assembly installed on the stage. The high-elevation work assembly comprises: a bucket that an operator can board; and a boom module for moving the bucket in a three-dimensional space to a work area. The boom module is provided with a multi-stage boom that has the bucket installed at one end and that moves the bucket in a three-dimensional space to a work area while expanding and contracting. The boom module is obliquely positioned with respect to the centerline of the vehicle parallel to the longitudinal direction of the vehicle when positioned on the stage in a state in which the multi-stage boom is contracted.

Description

aerial work platform

[0001] The present invention relates to an aerial work vehicle, and more particularly, to an aerial work vehicle used for work performed at an altitude.

[0002] Aerial work platforms are vehicles used for construction, inspection, and maintenance work performed at high altitudes. Aerial work platforms are used for tasks such as power line installation, signage installation, tree maintenance, and streetlight installation, as well as specialized work such as live-line work on high-voltage distribution lines, electrical lead-in work, hydraulic tool work, and pole-mounted transformer installation.

[0003] These aerial work platforms include a vehicle having a stage and an aerial work assembly installed on the stage. The aerial work assembly includes a bucket for carrying a worker and a boom module that moves the bucket to a work area in three-dimensional space. The boom module includes a telescoping multi-stage boom.

[0004] A typical aerial work vehicle has a multi-stage boom installed along the centerline of the vehicle parallel to the length of the vehicle, and a bucket is connected to the uppermost boom of the multi-stage boom.

[0005] The size of the aerial work platform assembly that can be installed on the stage is determined by the vehicle's loading capacity. Furthermore, design limitations exist due to the need to install the aerial work platform assembly on a stage of limited size.

[0006] In particular, in the case of vehicles with small loading capacities, such as 1-ton vehicles, the stage space is narrow, so there are problems with the physical rigidity of the bucket, problems with part of the bucket protruding outside the stage, problems with balance depending on the installation position of the bucket, and limitations on the length of the multi-stage boom.

[0007] That is, because the bucket has a square box shape with an open top, it is not physically strong and has the disadvantage of being vulnerable to torsion.

[0008] The multi-stage boom is installed on the stage along the centerline of the vehicle parallel to the longitudinal direction of the vehicle, and a bucket is installed on the foremost boom of the multi-stage boom. However, if the bucket is installed at the end of the foremost boom, the bucket protrudes out of the stage in the longitudinal direction of the vehicle. Since there is a limit to the length to which the bucket installed at the foremost end of the folded multi-stage boom can protrude out of the stage, the length of the folded multi-stage boom must be designed to be short depending on the length of the bucket.

[0009] To solve this problem, if a bucket is installed on one side of the leading boom, the center of gravity of the aerial work assembly is biased toward the side to which the bucket is connected, which may increase the risk of safety accidents due to weight bias during operation of the aerial work vehicle.

[0010] And since the multi-stage boom is driven by a telescopic method using wires, rollers that the wires catch are installed on the sides of the front ends of each unit boom. The front ends of the unit booms where the rollers are installed protrude outward through the front ends of each multi-stage boom. Therefore, when installing an aerial work assembly on a stage, in order to satisfy the length limitation of protruding out of the stage when connecting a bucket to the multi-stage boom, a short unit boom must be used considering the length protruding due to the rollers installed at the front ends of the unit booms. This causes a loss of extension length when the multi-stage boom is extended, which causes the problem of a reduction in the height that can be worked with the multi-stage boom.

[0011] And since the cross-section of the unit boom that constitutes the multi-stage boom is square or circular, it has a weakness that makes it vulnerable to mechanical stress such as torsion or bending.

[0012] [Prior Art Literature]

[0013] [Patent Document]

[0014] (Patent Document 1) Patent Publication No. 10-0822286 (Registered on April 8, 2008)

[0015] (Patent Document 2) Patent Publication No. 10-1812974 (registered on December 21, 2017)

[0016] (Patent Document 3) Patent Publication No. 10-2529827 (Registered on May 2, 2023)

[0017] Accordingly, an object of the present invention is to provide an aerial work platform capable of stably installing an aerial work assembly while satisfying design limitations due to a stage having a limited size.

[0018] Another object of the present invention is to provide an aerial work platform having a physically strong bucket.

[0019] Another object of the present invention is to provide an aerial work vehicle capable of minimizing the loss of length of a unit boom due to a roller installed at the tip of the unit boom.

[0020] Another object of the present invention is to provide an aerial work platform having a multi-stage boom that is resistant to mechanical stress such as torsion or bending.

[0021] In order to achieve the above object, the present invention provides an aerial work vehicle including a vehicle having a stage; and an aerial work assembly installed on the stage.

[0022] The above-mentioned aerial work assembly comprises a bucket on which a worker can ride; and a multi-stage boom having the bucket installed at one end and extending to move the bucket to a work area in three-dimensional space, and a boom module positioned obliquely with respect to a center line of the vehicle parallel to the longitudinal direction of the vehicle when the multi-stage boom is positioned on the stage in a retracted state.

[0023] The boom module may include a driving table installed on the stage and rotating in a horizontal direction; a rotating frame having a polygonal structure and having a hollow interior, installed on the driving table; and a multi-stage boom connected to the rotating frame.

[0024] The above bucket is installed on one side of the foremost boom of the above multi-stage boom. Here, the above one side is a surface that faces a relatively wide space of the above stage with respect to the multi-stage boom positioned obliquely when the above multi-stage boom is positioned on the above stage in a reduced state.

[0025] The above bucket has a box shape with a trapezoidal cross-section, and a surface based on the longer side among the two parallel sides of the trapezoid can be installed on one side of the foremost boom.

[0026] The above-mentioned top boom and the above-mentioned bucket can be manufactured from an insulating material.

[0027] The above multi-stage boom has a plurality of overlapping and elastic unit booms, and is driven to expand and contract in a telescopic manner using rollers and wires.

[0028] When the plurality of unit booms are overlapped and reduced, the rollers installed at the ends of the plurality of unit booms can overlap.

[0029] The unit boom on which the above roller is installed has a roller case that protects the roller installed at the front end of the unit boom.

[0030] The roller case of the unit boom prior to the last boom can be sequentially inserted and overlapped into the roller case of the last boom of the above multi-stage boom.

[0031] The roller case may include a roller insertion portion into which the roller is inserted; and a stopper connected to the roller insertion portion.

[0032] The above stopper is positioned closer to the entrance / exit of the unit boom than the roller insertion portion, and when the unit booms are overlapped, the roller insertion portions overlap, and the stoppers can be sequentially stacked and protrude outward.

[0033] The above unit boom has a tubular shape with a polygonal structure whose cross-section exceeds a hexagon.

[0034] The above boom module may further include upper and lower cylinders that connect the rotating frame and the rearmost boom of the multi-stage boom to adjust the vertical angle of the multi-stage boom.

[0035] The upper cylinder connects the front end of the rotating frame and the upper portion of the last boom of the multi-stage boom, and is connected via an X-shaped first bracket installed on the upper portion of the last boom.

[0036] The lower cylinder connects the middle part of the rotating frame and the lower part of the rearmost boom, and is connected via an X-shaped second bracket installed at the lower part of the rearmost boom.

[0037] And the first and second brackets are respectively positioned close to both ends of the rearmost boom to suppress twisting or bending of the rearmost boom.

[0038] According to the present invention, since the bucket has a trapezoidal box shape, it is physically stronger and more resistant to torsion than a conventional square box shape. That is, since the bottom surface of the bucket according to the present invention is formed in a trapezoidal shape, the distance between the opposing parallel surfaces is closer than that of a conventional square box, and since it has an asymmetrical surface area, it exhibits a strong resistance to torsion.

[0039] The multi-stage boom of the aerial work assembly is installed obliquely on the stage, and by installing the bucket in a relatively wide stage space by the multi-stage boom installed obliquely, the aerial work assembly can be stably installed on the stage while satisfying the design restrictions due to the stage having a limited size.

[0040] At this time, since the multi-stage boom is installed obliquely to the stage, a multi-stage boom of a longer length can be installed than when the multi-stage boom is installed along the center line of the vehicle parallel to the longitudinal direction of the vehicle.

[0041] By installing a bucket on one side of the leading boom and installing the bucket in a relatively wide stage space based on the multi-stage boom, the multi-stage boom and bucket can be installed on the stage while considering the weight balance, and the length of the bucket protruding outside the stage can be minimized. As described above, the bucket has a trapezoidal box shape, and by connecting the relatively wide side of the two parallel sides to one side of the leading boom, the bucket can be stably installed on the leading boom.

[0042] By overlapping the leading ends of the unit booms where the rollers are installed, the protruding length of the leading ends of the folded multi-stage booms where the rollers are installed can be reduced compared to the protrusion of each leading end of the existing unit booms where the rollers are installed. Since it is also possible to install each unit boom with a length that corresponds to the reduced length, it is possible to provide a multi-stage boom that can be extended to a longer length than the existing multi-stage boom.

[0043] Since the rollers of the unit boom are protected from the external environment by overlapping roller cases, contamination, defects, and damage to the rollers due to exposure to the external environment can be reduced.

[0044] Since the unit boom has a polygonal structure with a cross-section exceeding hexagons, it provides mechanical durability that is strong against mechanical stresses such as torsion or bending.

[0045] The brackets that connect the upper and lower cylinders that adjust the vertical angle of the multi-stage boom are installed in an X shape on the upper and lower parts of the base boom of the multi-stage boom, so that the upper and lower cylinders can be firmly connected to the upper and lower parts of the base boom of the multi-stage boom. Therefore, when the multi-stage boom is raised and lowered by the upper and lower cylinders, the X-shaped brackets provide mechanical durability that is strong against mechanical stress such as torsion or bending.

[0046] Figure 1 is a perspective view showing an aerial work vehicle according to an embodiment of the present invention.

[0047] Figure 2 is a perspective view showing the multi-stage boom of Figure 1 in an extended state.

[0048] Figure 3 is a plan view of Figure 1.

[0049] Figure 4 is a side view of Figure 1.

[0050] Figure 5 is a perspective view showing the bucket of Figure 1.

[0051] Fig. 6 is a perspective view showing the rotation frame of Fig. 1.

[0052] Figure 7 is a cross-sectional view taken along line 7-7 of Figure 6.

[0053] Fig. 8 is a perspective view showing the lower part of the multi-stage boom of Fig. 1.

[0054] Fig. 9 is a perspective view showing the tip of the multi-stage boom of Fig. 1.

[0055] Fig. 10 is a perspective view showing the multi-stage booms of Fig. 9 in an overlapping state.

[0056] Fig. 11 is a perspective view showing the multi-stage boom of Fig. 9 in an extended state.

[0057] It should be noted that in the following description, only the parts necessary for understanding the embodiments of the present invention are described, and the description of other parts will be omitted to the extent that it does not deviate from the gist of the present invention.

[0058] The terms and words used in this specification and claims described below should not be interpreted as limited to their conventional or dictionary meanings, but should be interpreted with meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to best describe his or her own invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely preferred embodiments of the present invention and do not represent all of the technical idea of ​​the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of this application.

[0059] Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings.

[0060] Fig. 1 is a perspective view showing an aerial work platform according to an embodiment of the present invention. Fig. 2 is a perspective view showing the multi-stage boom of Fig. 1 in an extended state. Fig. 3 is a plan view of Fig. 1. And Fig. 4 is a side view of Fig. 1.

[0061] Referring to FIGS. 1 to 4, an aerial work vehicle (100) according to the present embodiment includes a vehicle (10) having a stage (13), and an aerial work assembly (20) installed on the stage (13). Here, the aerial work assembly (20) includes a bucket (30) on which a worker can board, and a boom module (40) that moves the bucket (30) to a work area in a three-dimensional space. The boom module (40) has a multi-stage boom (70) that has a bucket (30) installed at one end thereof and moves the bucket (30) to the work area in a three-dimensional space while being retracted. When the multi-stage boom (70) is positioned on the stage (13) in a retracted state, the boom module (40) is positioned diagonally with respect to the center line of the vehicle (10) that is parallel to the longitudinal direction of the vehicle (10).

[0062] In addition, the aerial work vehicle (100) according to the present embodiment may include an outrigger (91), a battery pack (93), a hydraulic tank (95), and a control box (97), but is not limited thereto.

[0063] The aerial work vehicle (100) according to this embodiment will be described in detail with reference to FIGS. 1 to 11 as follows.

[0064] The vehicle (10) is a transport device for an aerial work platform (100). For example, the vehicle (10) may be a fossil fuel vehicle, an electric vehicle, or a hybrid vehicle. The vehicle (10) includes a vehicle body (11) and a stage (13) located at the rear of the vehicle body (11). The vehicle body (11) includes a driver's seat and equipment necessary for driving the vehicle (10). The stage (13) provides a space in which the aerial work assembly (20) is installed. The stage (13) may be a loading box of the vehicle (10), a body, or a frame on which the vehicle body (11) is installed.

[0065] The outrigger (91) supports the vehicle (10) when driving the aerial work assembly (20). The outrigger (91) is installed on the stage (13) and is flexibly mounted on the left and right sides of the front and rear of the stage (13) to stably support the vehicle (10) and support the aerial work vehicle (100) on the ground.

[0066] The battery pack (93) provides the electrical energy required for the operation of the aerial work vehicle (100). The battery pack (93) may be based on a lead-acid battery or a secondary battery. If the vehicle (10) is an electric or hybrid vehicle, the battery pack (93) may be based on a secondary battery.

[0067] The hydraulic tank (95) is installed on the stage (13) and provides the hydraulic pressure required to drive the upper and lower cylinders (81, 83) that raise and lower the multi-stage boom (70).

[0068] The control box (97) is a part that controls the operation of the aerial work vehicle (100). The control box (97) is equipped with valves, levers, buttons, joysticks, etc. that can operate the aerial work assembly (20) and the outriggers (91). The control box (97) may be equipped with a display device such as an LED or a touchscreen that allows a worker to check the operating status of the aerial work assembly (20) or the outriggers (91). If a touchscreen is equipped as the display device, the touchscreen can also be used as an input device, and thus the input devices such as the valves, levers, buttons, joysticks, etc. described above may be omitted.

[0069] And the high-altitude work assembly (20) includes a bucket (30) and a boom module (40) as described above.

[0070] The bucket (30) has a box shape with a trapezoidal cross-section, as shown in Fig. 5. Here, Fig. 5 is a perspective view showing the bucket (30) of Fig. 1.

[0071] The reason why the bucket (30) is implemented in the shape of a trapezoidal box is because, compared to a bucket (30) in the shape of a conventional square box, it is physically stronger and more resistant to torsion. That is, since the bottom surface of the bucket (30) according to the present embodiment has a trapezoidal shape, the distance between the opposing parallel surfaces is closer than that of a conventional square box, and it has an asymmetrical area, thereby exhibiting a strong characteristic against torsion.

[0072] This bucket (30) can be manufactured from an insulating material so that a worker can perform live work. The bucket (30) is formed with rounded corners so that the corners are not sharp so as to suppress sparks that may occur due to leakage current during live work. In order to reinforce the rigidity of the bucket (30), the bucket (30) has a plurality of reinforcing bars (33) formed vertically around the outer surface. That is, the bucket (30) includes a bucket body (31) having a box shape with a trapezoidal cross-section, and a plurality of reinforcing bars (33) formed vertically around the outer surface of the bucket body (31).

[0073] And the boom module (40) has a drive table (50), a rotation frame (60), and a multi-stage boom (70). The drive table (50) is installed on the stage (13) and rotates horizontally. The rotation frame (60) is installed on the drive table (50) and has a polygonal structure with a hollow space (62a) therein. And the multi-stage boom (70) is connected to the rotation frame (60).

[0074] The boom module (40) further includes upper and lower cylinders (81, 83).

[0075] Here, the driving table (50) is installed on the stage (13), as illustrated in FIG. 3, and is installed on the center line of the vehicle (10) parallel to the longitudinal direction of the vehicle (10). The driving table (50) receives rotational force from the motor and rotates clockwise or counterclockwise. This driving table (50) may have a disk shape.

[0076] A rotating frame (60) is installed on a driving table (50). The rotating frame (60) is installed at an angle centered on the driving table (50). As a result, the rotating frame (60), which rotates around the driving table (50), rotates in a conical orbit. Various devices installed on the vehicle body (11) and the stage (13) are located below the rotating orbit of the rotating frame (60) and the multi-stage boom (70).

[0077] This rotating frame (60) is implemented as a polygonal structure having a hollow space (62a) inside, as illustrated in FIGS. 6 and 7. Here, FIG. 6 is a perspective view showing the rotating frame (60) of FIG. 1. And FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 6.

[0078] That is, the rotating frame (60) has a tubular shape with one end open, and a multi-stage boom (70) is installed in the open portion via upper and lower cylinders (81, 83). That is, the rotating frame (60) is implemented in a tubular shape close to a diagonal shape overall with a polygonal cross-section. The open side of the rotating frame (60) is in the longitudinal direction of the rotating frame (60).

[0079] Since the rotating frame (60) has a hollow space (62a) inside, it can be made lighter. Since the rotating frame (60) has a structure in which a metal plate is bent into a polygonal structure, it provides mechanical durability that is strong against mechanical stress such as torsion or bending.

[0080] The rotating frame (60) includes a support plate (61) coupled to the driving table (50) and a frame shaft (62) coupled to the support plate (61). The frame shaft (62) includes a base shaft (63) having a cross-section in the shape of a stepper motor, and shaft partitions (69) each joined to the facing inner surfaces of the base shaft (63) to form a hollow space (62a) therein.

[0081] The base shaft (63) has a pair of facing shaft plates (64) and a connecting plate (67) connecting the pair of shaft plates (64), and the shaft bulkhead (69) is joined to the inner surface of each of the pair of shaft plates (64) to form a hollow space (62a) therein. The shaft plate (64) and the connecting plate (67) are formed integrally by bending a single metal plate.

[0082] In order to enable one end of the multi-stage boom (70) connected to the upper end of the rotating frame (60) to be raised and lowered while rotating up and down, a portion of the connecting plate (67) located at the upper end of the base shaft (63) is removed to form an open portion (68). As a result, the upper end of a pair of shaft plates (64) is separated from the connecting plate (67), and the corresponding portion is referred to as a separating plate (65), and the portion below the separating plate (65) is referred to as an integral plate (66). The upper ends of the pair of separating plates (65) can be connected.

[0083] The upper and lower cylinders (81, 83) connect the rotating frame (60) and the rearmost boom (72) of the multi-stage boom (70) to adjust the vertical angle of the multi-stage boom (70). The upper cylinder (81) connects the front end of the rotating frame (60) and the upper part of the rearmost boom (72) of the multi-stage boom (70), and is connected via an X-shaped first bracket (85) installed on the upper part of the rearmost boom (72). The lower cylinder (83) connects the middle part of the rotating frame (60) and the lower part of the rearmost boom (72), and is connected via an X-shaped second bracket (87) installed on the lower part of the rearmost boom (72).

[0084] Here, the upper and lower cylinders (81, 83) are hydraulic cylinders, and include a cylinder body and a cylinder rod. The upper cylinder (81) has a cylinder body rotatably installed on a pair of separating plates (65), and the cylinder rod is connected to a first bracket (85). The lower cylinder (83) has a cylinder body rotatably installed on a pair of integral plates (66), and the cylinder rod is connected to a second bracket (87).

[0085] The first and second brackets (85, 87) are positioned close to both ends of the rearmost boom (72), respectively, and since the upper and lower surfaces of the rearmost boom (72) are installed in an X shape, it is possible to suppress twisting or bending of the rearmost boom (72) that may occur when the multi-stage boom (70) is raised or lowered or the rotating frame (60) rotates according to the driving of the upper and lower cylinders (81, 83).

[0086] Since the multi-stage boom (70) connected to the rotating frame (60) rotates up and down about the rear end of the rearmost boom (72) as an axis, the lower cylinder (83) connected to the front end of the rearmost boom (72) is longer than the upper cylinder (81) connected to the rear end of the rearmost boom (72). In addition, since the lower cylinder (83) provides most of the force that pushes the multi-stage boom (70) upward, the capacity of the lower cylinder (83) is larger than the capacity of the upper cylinder (81). The upper cylinder (81) performs an auxiliary function so that the multi-stage boom (70) can be raised and lowered stably when the multi-stage boom (70) is raised and lowered by the lower cylinder (83).

[0087] The multi-stage boom (70) has a plurality of unit booms (71) that are overlapping and stretched, as illustrated in FIGS. 8 to 11, and is stretched and driven in a telescopic manner using rollers (75) and wires. Here, FIG. 8 is a perspective view showing the lower part of the multi-stage boom (70) of FIG. 1. FIG. 9 is a perspective view showing the front end of the multi-stage boom (70) of FIG. 1. FIG. 10 is a perspective view showing the multi-stage boom (70) of FIG. 9 in an overlapped state. And FIG. 11 is a perspective view showing the multi-stage boom (70) of FIG. 9 in an extended state.

[0088] A multi-stage boom (70) includes a rearmost boom (72) connected to a rotating frame (60), at least one inner boom (73) sequentially inserted into the interior of the rearmost boom (72), and a foremost boom (74) positioned inside the inner boom (73). The rearmost boom (72) is an outermost boom positioned at the outermost end of the multi-stage boom (70). An example of a multi-stage boom (70) according to the present embodiment is disclosed that includes two inner booms (73).

[0089] When the multi-stage boom (70) is extended, the internal unit boom (71) and the foremost boom (74) are extended to the same length based on the rearmost boom (72).

[0090] Since the rearmost boom (72) is installed on the rotating frame (60) via the upper and lower cylinders (81, 83), the rearmost boom (72) does not expand. An inner boom (73) and a foremost boom (74) are sequentially inserted and overlapped inside the rearmost boom (72).

[0091] The rear end of the rearmost boom (72) is installed at the upper end between a pair of shaft plates (64) via an upper cylinder (81). That is, the rear end of the rearmost boom (72) is positioned in a form in which it is inserted into an opening (68) between a pair of separating plates (65), and the upper surfaces of the rear end of the pair of separating plates (65) and the rear end of the rearmost boom (72) are connected by an upper cylinder (81). The lower surfaces of the pair of integral plates (66) and the front end of the rearmost boom (72) are connected by a lower cylinder (83).

[0092] When the multi-stage booms (70) are positioned on the stage (13) in an overlapping state, the multi-stage booms (70) are positioned so that the rear end of the last boom (72) is positioned higher than the front end. At this time, the cylinder rod of the upper cylinder (81) is in an extended state, and the cylinder rod of the lower cylinder (83) is in a contracted state. A bucket (30) is positioned on the frontmost boom (74) located at the front end of the last boom (72).

[0093] The expansion and contraction of the upper and lower cylinders (81, 83) are performed in opposite directions. That is, when the multi-stage booms (70) are overlapped and the leading ends are positioned with their leading ends inclined downward, when the length of the upper cylinder (81) contracts and the length of the lower cylinder (83) extends, the leading end of the multi-stage boom (70) moves upward. Conversely, when the length of the upper cylinder (81) extends and the length of the lower cylinder (83) contracts, the leading end of the multi-stage boom (70) moves downward.

[0094] A bucket (30) is installed on one side of the leading boom (74). One side of the leading boom (74) is a surface that faces the relatively wide space of the stage (13) based on the multi-stage boom (70) positioned obliquely when the multi-stage boom (70) is positioned above the stage (13) in a reduced state.

[0095] In this way, by installing the bucket (30) on one side of the leading boom (74) and installing the bucket (30) in a relatively wide space of the stage (13) based on the multi-stage boom (70), the weight imbalance problem caused by the multi-stage boom (70) being positioned obliquely with respect to the center line of the vehicle (10) parallel to the longitudinal direction of the vehicle (10) can be minimized, and the length by which the bucket (30) protrudes outside the stage (13) can be minimized.

[0096] As described above, the bucket (30) has a box shape with a trapezoidal cross-section. Since the bucket (30) is installed on one side of the leading boom (74) with the surface based on the longer side among the two parallel sides of the trapezoid, the bucket (30) can be stably installed on the leading boom (74).

[0097] The unit boom (71) has a polygonal tubular shape with a cross-section exceeding a hexagon. Due to this, the unit boom (71) provides mechanical durability that is strong against mechanical stress such as twisting or bending applied during the process of stretching or rotating. The unit boom (71) according to the present embodiment, except for the foremost boom (74), is disclosed as an example implemented in a tubular shape with a decagonal structure. That is, the unit boom (71) basically has a square tubular shape with four sides (upper side, lower side, and both sides), and the upper side and the lower side are formed as three or more polygonal sides. The upper side and the lower side of the unit spring are formed to be convex from the inside to the outside.

[0098] Since the leading boom (74) is located at the innermost part of the multi-stage boom (70), it is protected by another unit boom (71) that surrounds the leading boom (74), and thus is relatively less affected by mechanical stress such as torsion or bending. For this reason, the leading boom (74) can have a tubular shape with a square cross-section.

[0099] When the aerial work vehicle (100) according to the present embodiment is used for live line work, a unit boom (71) made of insulating material can be used as the leading boom (74).

[0100] When the multi-stage boom (70) is in a reduced state in which a plurality of unit booms (71) are overlapped, the rollers (75) installed at the ends of the plurality of unit booms (71) overlap. That is, by overlapping the ends of the unit booms (71) on which the rollers (75) are installed, the protruding length of the ends of the unit booms (71) on which the rollers (75) are installed can be reduced compared to the protrusion of each end of the existing unit booms (71) on which the rollers (75) are installed. Since it is also possible to design the length of each unit boom (71) to be longer by the amount of the reduced length, it is possible to provide a multi-stage boom (70) that can be extended to a longer length than the existing multi-stage boom.

[0101] A unit boom (71) on which a roller (75) is installed has a roller case (76) that protects the roller (75) installed at the front end of the unit boom (71). The roller cases (76) of the unit booms (71) prior to the rearmost boom (72) are sequentially inserted and overlapped into the roller case (76) of the rearmost boom (72). When the previous roller cases (76) are sequentially inserted and overlapped into the rearmost roller case (76), a stopper (78) is formed at the entrance / exit (71a) of the front end of the inserted unit boom (71) so that they can be stably inserted and overlapped. The stopper (78) is provided in the roller case (76) of the inserted unit boom (71). The stopper (78) of the inserted unit boom (71) is fixed by being caught on the stopper (78) of the inserted unit boom (71).

[0102] This roller case (76) includes a roller insertion portion (77) into which a roller (75) is inserted, and a stopper (78) connected to the roller insertion portion (77). The stopper (78) is positioned closer to the inlet / outlet (71a) of the unit boom (71) than the roller insertion portion (77). When the unit booms (71) overlap, the roller insertion portions (77) of the roller cases (76) overlap, and the stoppers (78) are sequentially stacked and protrude outward.

[0103] And since the roller (75) of the unit boom (71) is protected from the external environment by the overlapping roller case (76), contamination, defect occurrence, damage, etc. of the roller (75) due to exposure to the external environment can be reduced.

[0104] Meanwhile, the embodiments disclosed in this specification and drawings are merely specific examples to aid understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical concepts of the present invention are possible in addition to the embodiments disclosed herein.

[0105] [Explanation of symbols]

[0106] 10: Vehicle 11: Vehicle body

[0107] 13: Stage 20: Aerial Work Assembly

[0108] 30: Bucket 31: Bucket body

[0109] 33: Reinforcement bar 40: Boom module

[0110] 50: Driving table 60: Rotating frame

[0111] 61: Support plate 62: Frame shaft

[0112] 62a: Hollow 63: Base shaft

[0113] 64: Shaft plate 65: Separator plate

[0114] 66: Integral plate 67: Connecting plate

[0115] 68: Opening 69: Shaft bulkhead

[0116] 70: Multi-stage boom 71: Unit boom

[0117] 71a: Entrance / Exit 72: Last boom

[0118] 73: Inner boom 74: Front boom

[0119] 75: Roller 76: Roller Case

[0120] 77: Roller insert 78: Stopper

[0121] 81: Upper cylinder 83: Lower cylinder

[0122] 85: 1st bracket 87: 2nd bracket

[0123] 91: Outrigger 93: Battery pack

[0124] 95: Hydraulic tank 97: Control box

[0125] 100: Aerial work vehicle

Claims

1. A vehicle having a stage; and Including a high-altitude work assembly installed on the above stage; The above high-altitude work assembly is, A bucket for the worker to ride on; and A multi-stage boom is provided on one end of the bucket and moves the bucket to a work area in a three-dimensional space while being extended, and includes a boom module that is positioned obliquely with respect to the center line of the vehicle parallel to the longitudinal direction of the vehicle when the multi-stage boom is positioned on the stage in a contracted state; The above boom module, A driving table installed on the above stage and rotating in a horizontal direction; A rotating frame having a polygonal structure and having a hollow interior, installed on the above driving table; and including a multi-stage boom connected to the above rotating frame; The above multi-stage boom has multiple unit booms that overlap and expand, and is driven to expand in a telescopic manner using rollers and wires. When the above multiple unit booms are overlapped and reduced, the rollers installed at the tip of the multiple unit booms overlap, The unit boom on which the above roller is installed has a roller case that protects the roller installed at the front end of the unit boom, An aerial work vehicle characterized in that the roller case of the unit boom prior to the last boom is sequentially inserted and overlapped into the roller case of the last boom of the multi-stage boom.

2. In paragraph 1, The above bucket is installed on one side of the uppermost boom of the above multi-stage boom, An aerial work vehicle characterized in that the above-mentioned one side is a surface that faces a relatively wide space of the stage based on the obliquely positioned multi-stage boom when the multi-stage boom is positioned on the stage in a reduced state.

3. In paragraph 2, An aerial work vehicle characterized in that the bucket has a box shape with a trapezoidal cross-section, and a surface based on the longer side of the two parallel sides of the trapezoid is installed on one side of the foremost boom.

4. In paragraph 3, An aerial work vehicle characterized in that the uppermost boom and the bucket are made of insulating material.

5. In paragraph 1, The above multi-stage boom has multiple unit booms that overlap and expand, and is driven to expand in a telescopic manner using rollers and wires. An aerial work vehicle characterized in that when the plurality of unit booms are overlapped and reduced, the rollers installed at the tip of the plurality of unit booms overlap.

6. In the first paragraph, the roller case, A roller insertion portion into which the roller is inserted; and including a stopper connected to the above roller insertion portion; An aerial work vehicle characterized in that the stopper is positioned closer to the entrance / exit of the unit boom than the roller insertion portion, and when the unit booms are overlapped, the roller insertion portions overlap, and the stoppers are sequentially stacked and protrude outward.

7. In paragraph 5, An aerial work vehicle characterized in that the above unit boom has a tubular shape with a polygonal structure exceeding a hexagon in cross-section.

8. A vehicle having a stage; and Including a high-altitude work assembly installed on the above stage; The above high-altitude work assembly is, A bucket for the worker to ride on; and A multi-stage boom is provided on one end of the bucket and moves the bucket to a work area in a three-dimensional space while being extended, and includes a boom module that is positioned obliquely with respect to the center line of the vehicle parallel to the longitudinal direction of the vehicle when the multi-stage boom is positioned on the stage in a contracted state; The above boom module, A driving table installed on the above stage and rotating in a horizontal direction; A rotating frame having a polygonal structure and having a hollow interior, installed on the above driving table; a multi-stage boom connected to the above rotating frame; and It includes upper and lower cylinders that connect the rotating frame and the last boom of the multi-stage boom to adjust the vertical angle of the multi-stage boom; The upper cylinder connects the front end of the rotating frame and the upper portion of the last boom of the multi-stage boom, and is connected via an X-shaped first bracket installed on the upper portion of the last boom. The lower cylinder connects the middle part of the rotating frame and the lower part of the rearmost boom, and is connected via an X-shaped second bracket installed at the lower part of the rearmost boom. An aerial work vehicle characterized in that the first and second brackets are positioned close to each end of the rearmost boom to suppress twisting or bending of the rearmost boom.

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