Free rotation type indoor aerial work platform

Abstract

The invention relates to a free rotation type indoor aerial work platform which comprises a chassis frame and a work table rotationally arranged on the chassis frame, a universal sliding ring is arranged between the chassis frame and the work table, the universal sliding ring integrates a liquid path mechanism and a circuit mechanism, the liquid path mechanism comprises a rotating part and a fixing part which are matched, and an oil cavity is reserved between the rotating part and the fixing part. The continuous oil supply of the hydraulic element is realized in the rotating process; the fixing part comprises a vertical shaft, the circuit mechanism comprises a sliding cylinder vertically and slidably arranged on the lower portion of the vertical shaft in a sleeving mode, a plurality of conducting rings are axially arranged on the outer ring of the sliding cylinder at intervals, contact brush pieces are arranged on one side of the sliding cylinder corresponding to the conducting rings, and continuous power supply of electrical elements is achieved in the rotating process through contact friction of the contact brush pieces arranged on the conducting rings. And the electromagnetic coil is arranged between the lower side of the fixed disc and the upper end of the sliding cylinder, so that the conductive ring and the contact brush sheet are separated when the circuit mechanism is not needed to work, continuous contact abrasion between the conductive ring and the contact brush sheet is avoided, and the stability of electric transmission work of the circuit mechanism is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of aerial work platforms, specifically relating to a free-rotating indoor aerial work platform. Background Technology

[0002] Indoor aerial work platforms are widely used in industrial production, warehousing and logistics, equipment maintenance, and automated production. They primarily facilitate the lifting and transfer of personnel and materials. However, with the increasing demand for multi-station operations, confined space operations, and multi-angle docking, platforms with only a single lifting function are no longer sufficient to meet the needs of efficient operations. Therefore, the industry has gradually developed platforms that combine lifting and slewing mechanisms, allowing for platform orientation adjustment during lifting, thus improving operational flexibility and space utilization.

[0003] Existing rotating aerial work platforms use a rotating mechanism driven by a slewing bearing, gear rack, and hydraulic motor to achieve platform rotation. While such equipment has found some application in daily life and industrial production, it still has significant shortcomings in terms of continuous rotation and rotation angle. On the one hand, the existing rotating structure is limited by factors such as pipe entanglement and wiring, restricting the rotation range and preventing continuous 360° free rotation. It can only achieve limited angular reciprocating rotation, which affects work efficiency. Moreover, there are many hydraulic oil pipes and cables, making the routes quite complex, while the space of indoor aerial work platforms is limited. On the other hand, its hydraulic pipelines and electrical cables lack anti-entanglement design, making them prone to twisting, damage, and breakage during long-term rotation, resulting in a high failure rate.

[0004] The applicant attempted to introduce a slip ring structure into the aerial work platform to achieve 360° rotation. However, it was found that the existing slip ring structure was not compatible with the working environment of the aerial work platform. Taking the application document with application number CN202310743684.3 in the patent database as an example, a multi-functional combined gas-liquid-photoelectric slip ring is disclosed, which adopts a dual-path combination structure of gas / liquid path and circuit: On the one hand, the hydraulic pressure driving the lifting, rotation or support of aerial work platforms is generally large. The existing structure, which uses a gas-liquid shell to coaxially cover the rotor and sets a feeding hole on the gas-liquid shell and a gas-liquid through hole at the corresponding position of the rotor, has high requirements for the rotational sealing of the rotor and the gas-liquid shell. Once the hydraulic pressure is too high, the gas-liquid shell is prone to expansion deformation at the feeding hole position, affecting its rotational sealing. On the other hand, the existing slip ring structure relies on the sliding contact between the brush assembly and the conductive assembly to transmit electrical signals. When wiring or other operations that require power disconnection are performed on the moving end of the aerial work platform, the circuit can only be cut off at the fixed inlet end, which is inconvenient. Moreover, when the slip ring is not working, or when the slip ring only performs oil transportation and not power transportation, there will always be a frictional contact between the conductive assembly and the brush assembly. Over time, the conductive assembly and the brush assembly can easily cause open circuits due to poor contact, resulting in equipment failure. Summary of the Invention

[0005] To address the technical problems existing in the background art, the present invention provides a free-rotating indoor aerial work platform.

[0006] The technical solution of the present invention is as follows: This invention provides a free-rotating indoor aerial work platform, including a chassis frame and a work platform rotatably mounted on it. The work platform enables the rotation and lifting of personnel or materials. To achieve 360° free rotation of the work platform on the chassis frame, a universal slip ring is provided between the chassis frame and the work platform. The universal slip ring includes a hydraulic mechanism and an electrical mechanism, enabling continuous oil and power supply during the 360° rotation of the work platform.

[0007] As one of the core technical concepts of this invention, the hydraulic circuit mechanism includes a rotating part and a fixed part arranged vertically. The fixed part includes a fixed plate fixed to the chassis frame, with several fixed cylinders coaxially arranged on its upper side and spaced apart. The rotating part includes a turntable, with several rotating cylinders coaxially arranged on its lower side and spaced apart, which are adapted to the gaps between adjacent fixed cylinders. The rotating cylinders are coaxially rotatably inserted into the gaps between adjacent fixed cylinders. The gap between the lower end of the rotating cylinder and the upper side of the fixed plate forms an annular oil cavity. The fixed plate has an oil port corresponding to the oil cavity, and the turntable has an oil passage vertically penetrating through the wall of the rotating cylinder corresponding to the oil cavity.

[0008] Based on this structure, the gap between the lower end of the rotating drum and the fixed plate, as well as the reserved gap between adjacent fixed drums, together form an annular oil cavity. The oil port, oil cavity, and oil passage together form the oil supply circuit. The oil port can be used as a fixed end to connect with external oil supply equipment, and the upper end of the oil passage can be used as a rotating end to connect with the hydraulic components on the worktable, realizing 360° rotational oil supply. Since several rotating drums are respectively located in the gap between adjacent fixed drums, the drum walls of the rotating drums and the fixed drum walls are effectively fitted. The oil cavity is located at the root of the fixed drum. When the internal oil pressure is high, it is more difficult to push the fixed drum to deform, ensuring the pressure bearing and sealing effect of the oil cavity. Moreover, this structural design can also effectively improve the isolation effect of hydraulic oil between adjacent oil cavities. That is to say, the leakage of hydraulic oil between adjacent oil cavities must first pass upward through the gap between the drum walls of the rotating drum and the fixed drum, and then downward through the gap between the drum walls of another rotating drum and the fixed drum. This design method, which extends the hydraulic oil penetration path, further avoids hydraulic oil penetration and ensures the sealing effect under high pressure.

[0009] As another core technical concept of the present invention, the lower side of the fixed disk is fixed to the chassis frame by a mounting cylinder. The lower side of the middle of the turntable is vertically provided with a vertical shaft that passes through the innermost fixed cylinder and the middle of the fixed disk and extends into the mounting cylinder. A wire channel runs vertically through the middle of the vertical shaft. The circuit mechanism includes a slide cylinder that is vertically slidably sleeved on the lower part of the vertical shaft. A tension spring is provided between the lower end of the slide cylinder and the lower end of the vertical shaft. An electromagnetic coil fixed to the lower side of the fixed disk is provided on the upper outer ring of the vertical shaft. A number of conductive rings are axially spaced on the outer ring of the slide cylinder. A number of contact brushes are provided inside the mounting cylinder corresponding to the conductive rings. The electromagnetic coil is configured to magnetically drive the slide cylinder to move up until the conductive ring contacts the corresponding contact brush. A through-hole is provided on one side of the mounting cylinder. A first wire extending from the upper end of the wire channel is connected to the conductive ring. A second wire extending from the through-hole and extending into the mounting cylinder is connected to the contact brush.

[0010] Based on this structure, the conductive ring and the contact brush together form a power supply circuit. The contact brush can be connected to an external power supply device as a fixed end via a second wire, and to electrical components on the workbench as a rotating end via a first wire, achieving 360° rotation power supply. Moreover, by controlling the on and off of the electromagnetic coil, the contact and separation of the conductive ring and the contact brush can be controlled, making it easier to perform wiring or other operations that require power disconnection on the moving end of the workbench. Furthermore, when the circuit mechanism is not required to work, or when only the hydraulic circuit mechanism is working, the conductive ring can separate from the contact brush, avoiding continuous contact wear and significantly improving the stability of the electrical transmission operation of the circuit mechanism.

[0011] As described above, a free-rotating indoor aerial work platform, a major highlight of this invention, features a rotating part that can float up and down. The electromagnetic coil is configured to magnetically drive the sliding cylinder to move upwards until the conductive ring contacts the corresponding contact brush when the rotating part floats to a preset position. In other words, the electromagnetic coil can only control the on / off state of the circuit mechanism when the hydraulic system is working. When the hydraulic system is in a static state, the electromagnetic coil cannot effectively control the on / off state of the circuit mechanism. This method, which uses the hydraulic system as the basis for determining whether the aerial work platform is working, and then controls the on / off state of the circuit mechanism, achieves permanent power cut-off when the hydraulic system is not working. This effectively avoids the risk of electric shock to personnel when the aerial work platform is not in operation, and also further avoids ineffective wear between the conductive ring and the contact brush, improving the stability of the electrical transmission operation of the circuit mechanism.

[0012] In a preferred embodiment, to ensure that the rotating part can be effectively reset when the hydraulic circuit mechanism is not working, a pressure cylinder is fixed on the upper side of the fixed plate, the rotating part is located inside the pressure cylinder, the inner ring of the upper end of the pressure cylinder extends inward, and a spring is provided between the pressure cylinder and the rotating part, and the rotating part is subjected to the spring force downward.

[0013] As a further preferred embodiment, to ensure that the spring does not interfere with the rotation of the rotating part when the hydraulic circuit mechanism is in operation, a thrust bearing is provided between the lower end of the spring and the rotating part, and / or between the upper end of the spring and the pressure cylinder.

[0014] As described above, in order to facilitate the installation or replacement of conductive rings and to allow for selection of the number of conductive rings as needed, the upper outer ring of the slide cylinder extends outward, and a nut is spirally provided at the lower part. Several conductive rings are squeezed and fixed between the nut and the extended part of the upper end of the slide cylinder.

[0015] As described above, in order to facilitate the rotation drive of the work platform, the chassis frame is also equipped with a drive device that can drive the work platform to rotate.

[0016] To ensure the driving stability of the drive device, the drive device includes a gear plate fixed on the chassis frame and a drive motor fixed on the workbench. The drive end of the drive motor is provided with a gear that meshes with the gear plate.

[0017] As described above, in order to ensure the stability of the chassis frame and thus the stability of the aerial work platform in a pit environment, the underside of the chassis frame is also equipped with an anti-tipping device that can be extended and retracted.

[0018] The beneficial effects of this invention are as follows: 1) By installing a universal slip ring between the chassis frame and the workbench, the workbench can rotate freely 360°, avoiding problems such as entanglement, twisting, damage, and wire breakage caused by the restriction of pipelines and lines when the workbench rotates; 2) Since several rotating cylinders are respectively located in the gap between adjacent fixed cylinders, the cylinder walls of the rotating cylinders and the cylinder walls of the fixed cylinders are effectively fitted. The oil cavity is located at the root of the fixed cylinder. When the internal oil pressure is high, it is more difficult to push the fixed cylinder to deform, thus ensuring the pressure bearing and sealing effect of the oil cavity. Moreover, this structural design can also effectively improve the isolation effect of hydraulic oil between adjacent oil cavities. That is to say, the leakage of hydraulic oil between adjacent oil cavities must first pass upward through the gap between the cylinder walls of the rotating cylinder and the fixed cylinder, and then downward through the gap between the cylinder walls of another rotating cylinder and the fixed cylinder. This design method, which extends the hydraulic oil penetration path, further avoids the penetration of hydraulic oil and ensures the sealing effect under high pressure. 3) By controlling the on and off of the electromagnetic coil, the contact and separation of the conductive ring and the contact brush can be controlled, making it easier to perform wiring or other operations that require power off at the moving end of the worktable. Moreover, when the circuit mechanism is not working, or when only the hydraulic mechanism is working, the conductive ring can separate from the contact brush, avoiding continuous contact wear and significantly improving the stability of the electrical transmission of the circuit mechanism. Attached Figure Description

[0019] The solutions and advantages of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] In the attached diagram: Figure 1 This is a top view of the aerial work platform in the embodiment; Figure 2 This is a side view of the aerial work platform in the embodiment; Figure 3 This is a schematic diagram of the universal slip ring in the embodiment; Figure 4 for Figure 3 A sectional view; Figure 5 This is a schematic diagram of the hydraulic circuit mechanism in the embodiment; Figure 6 for Figure 5 A sectional view; Figure 7 This is an exploded view of the upper shaft side of the hydraulic circuit mechanism in the embodiment; Figure 8 This is an exploded view of the lower shaft side of the hydraulic circuit mechanism in the embodiment; Figure 9This is a schematic diagram of the rotating part in the embodiment; Figure 10 for Figure 9 A sectional view; Figure 11 This is a schematic diagram of the fixing part in the embodiment; Figure 12 for Figure 11 A sectional view; Figure 13 This is a schematic diagram of the circuit mechanism in the embodiment; Figure 14 for Figure 13 A sectional view; The components represented by the various reference numerals in the diagram are: 1. Chassis frame; 2. Workbench; 21. Turning frame; 22. Vertical frame; 3. Universal slip ring; 31. Hydraulic circuit mechanism; 311. Rotating part; 3111. Turntable; 3112. Rotating cylinder; 3113. Outer cylinder; 3114. Vertical shaft; 312. Fixed part; 3121. Fixed plate; 3122. Fixed cylinder; 313. Pressure cylinder; 314. Spring; 315. Thrust bearing; 32. Mounting cylinder; 33. 331. Circuit mechanism; 332. Electromagnetic coil; 333. Rotating part; 3321. Slide cylinder; 3322. Insulating pad; 3323. Conductive ring; 3324. Nut; 333. Tension spring; 334. Fixed terminal; 3341. Fixing frame; 3342. Contact brush; 34. Connecting oil nozzle; 4. Fixing base; 5. Drive device; 51. Gear ring; 52. Drive motor; 53. Gear; 6. Oil valve. Detailed Implementation

[0021] To further understand the content of this invention, the invention will be described in detail below with reference to the embodiments and accompanying drawings.

[0022] Example: This embodiment provides a free-rotating indoor aerial work platform; see [link / reference]. Figure 1 and Figure 2 The aerial work platform includes a chassis frame 1 and a work platform 2 rotatably mounted on it. The work platform 2 enables the rotation and lifting of personnel or materials. To enable the work platform 2 to rotate freely 360° on the chassis frame 1, a universal slip ring 3 is provided between the chassis frame 1 and the work platform 2. The universal slip ring 3 includes a hydraulic mechanism 31 and an electrical mechanism 33. During the 360° rotation of the work platform 2, continuous oil and power supply are achieved. The structure of the aerial work platform (the above-mentioned free-rotating indoor aerial work platform) will be described in detail below with reference to the accompanying drawings.

[0023] In this embodiment, the workbench 2 includes a rotating frame 21 that is horizontally mounted on the upper side of the chassis frame 1 and can rotate around a vertical axis. A vertical frame 22 is provided on the upper side of the rotating frame 21, and a platform frame is provided on the vertical frame 22 that can be raised and lowered. In order to facilitate the rotation drive of the workbench 2, a drive device 5 that can drive the workbench 2 to rotate is also provided on the chassis frame 1.

[0024] To ensure the driving stability of the drive device 5, specifically speaking, the drive device 5 includes a gear plate fixed on the chassis frame 1. The gear plate is coaxially arranged with the rotation axis of the rotating frame 21. The drive device 5 also includes a drive motor 52 fixed on the rotating frame 21 of the workbench 2. The drive end of the drive motor 52 is provided with a gear 53 that meshes with the gear plate. The rotation of the drive motor 52 can drive the gear 53 to rotate, and then, under the meshing with the gear ring 51, drive the rotating frame 21 to rotate.

[0025] In this embodiment, in order to ensure the stability of the chassis frame 1 and thus the stability of the aerial work platform in the pit environment, the chassis frame 1 is also provided with an anti-tipping device that can be opened and retracted.

[0026] Specifically, the anti-tipping device includes two support plates hinged to the lower sides of the chassis frame 1. The support plates are connected to telescopic cylinders via a transmission assembly. The telescopic cylinders can drive the two support plates to open vertically or retract horizontally, thus completing the stable support work of the aerial work platform in pit (uneven ground) environments.

[0027] In this embodiment, combined with Figure 3 and Figure 4 The universal slip ring 3 is vertically fixed on the upper side of the chassis frame 1 and located inside the rotating frame 21. The structure of the universal slip ring 3 will be described in detail below.

[0028] Combination Figures 5-8 As one of the core technical concepts of this invention, regarding the structure of the hydraulic circuit mechanism 31, it includes a rotating part 311 and a fixed part 312 arranged vertically. Figure 11 and Figure 12 The fixing part 312 includes a fixing plate 3121 fixed to the chassis frame 1, and a plurality of fixing cylinders 3122 are coaxially arranged on its upper side with gaps between them. Figure 9 and Figure 10The rotating part 311 includes a turntable 3111, with a plurality of rotating cylinders 3112 coaxially arranged on its lower side and spaced apart to match the gaps between adjacent fixed cylinders 3122. The upper side is fixed to the rotating frame 21 by a fixed seat 4. The rotating cylinders 3112 are coaxially rotatably inserted into the gaps between adjacent fixed cylinders 3122. The gap between the lower end of the rotating cylinder 3112 and the upper side of the fixed turntable 3121 forms an annular oil cavity. The fixed turntable 3121 is provided with an oil port corresponding to the oil cavity. The turntable 3111 is provided with an oil passage vertically penetrating through the cylinder wall of the rotating cylinder 3112 corresponding to the oil cavity. The upper end of the oil port and the oil passage is provided with a connecting oil nozzle 34.

[0029] Based on this structure, the gap between the lower end of the rotating cylinder 3112 and the fixed plate 3121, as well as the reserved gap between adjacent fixed cylinders 3122, together form an annular oil cavity. The oil port, oil cavity, and oil passage together form an oil supply circuit. The oil port can be connected to an external oil supply device as a fixed end, and the upper end of the oil passage can be connected to the hydraulic components on the workbench 2 as a rotating end, realizing 360° rotational oil supply. Since several rotating cylinders 3112 are respectively arranged in the gap between adjacent fixed cylinders 3122, the cylinder wall of the rotating cylinder 3112 and the cylinder wall of the fixed cylinder 3122 are effectively fitted, and the oil cavity is located entirely within the fixed cylinder 3112. At the root of 22, when the internal oil pressure is high, it is more difficult to push the fixed cylinder 3122 to deform, ensuring the pressure bearing and sealing effect of the oil cavity. Moreover, this structural design can also effectively improve the isolation effect of hydraulic oil between adjacent oil cavities. That is to say, the leakage of hydraulic oil between adjacent oil cavities must first pass upward through the gap between the cylinder wall of the rotating cylinder 3112 and the fixed cylinder 3122, and then downward through the gap between the cylinder wall of another rotating cylinder 3112 and the fixed cylinder 3122. This design method, by extending the hydraulic oil penetration path, further avoids the penetration of hydraulic oil and ensures the sealing effect under high pressure.

[0030] Furthermore, the aerial work platform also includes an oil valve 6, which can be installed between the external oil supply equipment and the connecting oil nozzle 34 on the oil port, or it can be installed between the connecting oil nozzle 34 at the upper end of the oil passage and the hydraulic components. Further details are omitted here.

[0031] Combination Figure 13 and Figure 14 As another core technical concept of the present invention, regarding the structure of the circuit mechanism 33, the lower side of the fixed plate 3121 is fixed to the chassis frame 1 through the mounting cylinder 32. The mounting cylinder 32 is also provided with a connecting oil nozzle 34 that communicates with the oil nozzle 34 on the oil port, so as to facilitate the introduction of hydraulic oil from the external oil supply equipment.

[0032] Furthermore, the turntable 3111 has a vertical shaft 3114 extending into the mounting cylinder 32, passing through the innermost fixed cylinder 3122 and the middle of the fixed disk 3121, on its lower center side. A wire channel runs vertically through the middle of the vertical shaft 3114. The circuit mechanism 33 includes a rotating part 332, which includes a sliding cylinder 3321 vertically slidably sleeved on the lower part of the vertical shaft 3114. A tension spring 333 is provided between the lower end of the sliding cylinder 3321 and the lower end of the vertical shaft 3114. An electromagnetic coil 331 fixed to the lower side of the fixed disk 3121 is provided on the upper outer ring of the vertical shaft 3114. The outer ring of the sliding cylinder 3321 is axially spaced. There are several conductive rings 3323; the circuit mechanism 33 also includes a fixed terminal 334, the fixed terminal 334 includes a fixed frame 3341 located inside the mounting cylinder 32, and several contact brushes 3342 arranged on the fixed frame 3341 corresponding to the several conductive rings 3323. The electromagnetic coil 331 is configured to magnetically drive the slide cylinder 3321 to move upward to contact the conductive rings 3323 and the corresponding contact brushes 3342. A through-hole is provided on one side of the mounting cylinder 32. A first wire extending from the upper end of the wire channel is connected to the conductive rings 3323, and a second wire extending from the through-hole and extending from the mounting cylinder 32 is connected to the contact brushes 3342.

[0033] Based on this structure, the conductive ring 3323 and the contact brush 3342 together form a power supply circuit. The contact brush 3342 can be connected to an external power supply device as a fixed end through a second wire, and the contact brush 3342 can be connected to electrical components on the workbench 2 as a rotating end through a first wire, realizing 360° rotation power supply. Moreover, by controlling the on and off of the electromagnetic coil 331, the contact and separation of the conductive ring 3323 and the contact brush 3342 can be controlled, making it easier to perform wiring or other operations that require power disconnection on the moving end of the workbench 2. Furthermore, when the circuit mechanism 33 is not working, or when only the hydraulic circuit mechanism 31 is working, the conductive ring 3323 can be separated from the contact brush 3342, avoiding continuous contact wear and significantly improving the stability of the electrical transmission operation of the circuit mechanism 33.

[0034] As a preferred embodiment of this invention, in order to facilitate the installation or replacement of the conductive ring 3323 and to allow for selection of the number of conductive rings 3323 as needed, the upper outer ring of the slide cylinder 3321 extends outward, and the lower part is provided with a nut 3324 spirally arranged. Several conductive rings 3323 are squeezed and fixed between the nut 3324 and the extended part of the upper end of the slide cylinder 3321.

[0035] Specifically, the rotating part 332 further includes a cylindrical insulating pad 3322 sleeved on the slide cylinder 3321. The outer ring of the middle part of the insulating pad 3322 is provided with an annular groove. The inner ring of the conductive ring 3323 is engaged in the annular groove. The inner wall of the slide cylinder 3321 is provided with a rib in the axial direction. The side wall of the vertical shaft 3114 is provided with a guide groove that passes through the outer and inner wire channels. The rib and the guide groove are slidably engaged to avoid relative rotation between the slide cylinder 3321 and the vertical shaft 3114. The end of the first wire passes through the rib and the insulating pad 3322 and is electrically connected to the corresponding conductive ring 3323.

[0036] In this embodiment, as a major inventive highlight of the present invention, it is combined with Figures 6-8 The rotating part 311 can be floated up and down. The electromagnetic coil 331 is configured to magnetically drive the slide cylinder 3321 to move up to contact the conductive ring 3323 and the corresponding contact brush 3342 only when the rotating part 311 floats to a preset position. In other words, the electromagnetic coil 331 can only control the on / off state of the circuit mechanism 33 when the liquid circuit mechanism 31 is working. When the liquid circuit mechanism 31 is in a static state, the electromagnetic coil 331 cannot effectively control the on / off state of the circuit mechanism 33. This method of using the liquid circuit mechanism 31 as the basis for whether the aerial work platform is working, and then controlling the on / off state of the circuit mechanism 33, achieves permanent power-off when the liquid circuit mechanism 31 is not working. This effectively avoids the risk of electric shock to personnel caused by the aerial work platform in a non-working state. It also further avoids ineffective wear between the conductive ring 3323 and the contact brush 3342, and improves the stability of the electrical transmission of the circuit mechanism 33.

[0037] As a preferred embodiment of this invention, in order to ensure that the rotating part 311 can be effectively reset when the hydraulic circuit mechanism 31 is not working, a pressure cylinder 313 is fixed on the upper side of the fixed disk 3121, the rotating part 311 is located inside the pressure cylinder 313, the inner ring of the upper end of the pressure cylinder 313 extends inward, and a spring 314 is provided between the pressure cylinder 313 and the rotating part 311, and the rotating part 311 is subjected to the elastic force of the spring 314 downward.

[0038] Specifically, the rotating part 311 further includes an outer cylinder 3113 coaxially and spaced outside the outermost rotating cylinder 3112. The inner diameter of the outer cylinder 3113 is adapted to the outer diameter of the outermost fixed cylinder 3122, and the lower outer ring extends outward. The vertical cylinder is spaced outside the outer cylinder 3113, and its lower end extends outward and is fixed to the fixed plate 3121. Its upper end is folded inward and can press against the upper side of the rotating plate 3111, so that the rotating part 311 can float up and down to a certain extent between the fixed plate 3121 and the upper end of the outer cylinder 3113. The spring 314 is sleeved outside the outer cylinder 3113, and its lower end abuts against the upper side of the lower end of the outer cylinder 3113 and the lower end abuts against the lower side of the inwardly folded part of the pressure cylinder 313.

[0039] As a further preferred embodiment, to ensure that the spring 314 does not interfere with the rotation of the rotating part 311 when the hydraulic circuit mechanism 31 is in operation, a thrust bearing 315 is provided between the lower end of the spring 314 and the rotating part 311, and / or between the upper end of the spring 314 and the pressure cylinder 313. In this embodiment, the thrust bearing 315 is a thrust ball bearing, which is coaxially sleeved on the outer ring of the outer cylinder 3113, and its lower side abuts against the upper side of the lower extension of the outer cylinder 3113, and its upper side abuts against the lower end of the spring 314.

[0040] Based on the above-mentioned aerial work platform structure, the universal slip ring 3 adopts a dynamic-static separation dual-body structure, which separates the integrated pipeline and cable into a fixed-end transmission link and a rotating-end transmission link. The two links achieve dynamic docking without relative entanglement inside the universal slip ring 3. The fixed end is rigidly connected to the power supply equipment, oil supply equipment, and chassis frame 1. The external power lines, control lines, and hydraulic main pipelines are all connected to the fixed end and remain stationary throughout the process, without participating in any rotational movement, thus avoiding the twisting between pipelines and cables from the root. The rotating end is connected to the rotating frame 21, which integrates the cooperative structure of conductive ring 3323 and contact brush 3342. It can rotate infinitely 360° and above with the load, rotating only itself and not driving the movement of external pipelines and cables, effectively avoiding entanglement, twisting, and stroke limitations.

Claims

1. A free-rotating indoor aerial work platform, comprising a chassis frame (1) and a work platform (2) rotatably mounted thereon, characterized in that, A universal slip ring (3) is provided between the chassis frame (1) and the worktable (2). The universal slip ring (3) includes a hydraulic circuit mechanism (31) and a circuit mechanism (33). The fluid circuit mechanism (31) includes a rotating part (311) and a fixed part (312) arranged vertically. The fixed part (312) includes a fixed plate (3121) fixed to the chassis frame (1), with a plurality of fixed cylinders (3122) coaxially arranged on its upper side and spaced apart. The rotating part (311) includes a turntable (3111), with a plurality of rotating cylinders (3112) coaxially arranged on its lower side and spaced apart, which are adapted to the gaps between adjacent fixed cylinders (3122). The rotating cylinders (3112) are coaxially rotatably inserted into the gaps between adjacent fixed cylinders (3122). The lower end of the rotating drum (3112) and the upper side of the fixed disk (3121) form an annular oil cavity. The fixed disk (3121) is provided with an oil port corresponding to the oil cavity. The rotating disk (3111) has an oil passage that passes through the cylinder wall of the rotating drum (3112) vertically through the oil cavity. The lower side of the fixed plate (3121) is fixed to the chassis frame (1) by the mounting cylinder (32). The lower side of the middle part of the turntable (3111) is provided with a vertical shaft (3114) that passes through the innermost fixed cylinder (3122) and the middle part of the fixed plate (3121) and extends into the mounting cylinder (32). A wire channel runs vertically through the middle part of the vertical shaft (3114). The circuit mechanism (33) includes a slide cylinder (3321) that is vertically slidably sleeved on the lower part of the vertical shaft (3114). A tension spring (333) is provided between the lower end of the slide cylinder (3321) and the lower end of the vertical shaft (3114). An electromagnetic coil (331) is fixed to the lower side of the fixed disk (3121) on the upper outer ring of the vertical shaft (3114). The outer ring of the slide cylinder (3321) is axially spaced with a number of conductive rings (3323). The mounting cylinder (32) is provided with a number of contact brushes (3342) corresponding to the conductive rings (3323). The electromagnetic coil (331) is configured to magnetically drive the slide cylinder (3321) to move up to the conductive rings (3323) and contact the corresponding contact brushes (3342). The mounting cylinder (32) has an opening on one side, a first wire extending from the upper end of the track is connected to the conductive ring (3323), and a second wire extending from the opening of the mounting cylinder (32) is connected to the contact brush (3342).

2. The free-rotating indoor aerial work platform according to claim 1, characterized in that, The rotating part (311) can be floated up and down. The electromagnetic coil (331) is configured to magnetically drive the slide cylinder (3321) to move up to the conductive ring (3323) and contact the corresponding contact brush (3342) only when the rotating part (311) floats up to the preset position.

3. The free-rotating indoor aerial work platform according to claim 2, characterized in that, A pressure cylinder (313) is fixed on the upper side of the fixed plate (3121), and the rotating part (311) is located inside the pressure cylinder (313); The inner ring of the upper end of the pressure cylinder (313) extends inward, and a spring (314) is provided between it and the rotating part (311). The rotating part (311) is subjected to the elastic force of the spring (314) downward.

4. The free-rotating indoor aerial work platform according to claim 3, characterized in that, A thrust bearing (315) is provided between the lower end of the spring (314) and the rotating part (311), and / or between the upper end of the spring (314) and the pressure cylinder (313).

5. A free-rotating indoor aerial work platform according to any one of claims 1-4, characterized in that, The upper outer ring of the slide cylinder (3321) extends outward, and the lower part is spirally provided with a nut (3324). Several conductive rings (3323) are squeezed and fixed between the nut (3324) and the extended part of the upper end of the slide cylinder (3321).

6. A free-rotating indoor aerial work platform according to any one of claims 1-4, characterized in that, The chassis frame (1) is also equipped with a drive device (5) that can drive the workbench (2) to rotate.

7. A free-rotating indoor aerial work platform according to claim 6, characterized in that, The drive device (5) includes a gear plate fixed on the chassis frame (1) and a drive machine (52) fixed on the worktable (2). The drive end of the drive machine (52) is provided with a gear (53) that meshes with the gear plate.

8. A free-rotating indoor aerial work platform according to any one of claims 1-4, characterized in that, The chassis frame (1) is also equipped with an anti-tipping device that can be opened and retracted on the lower side.

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