Auxiliary ring net cabinet installation lifting device and working method

Abstract

The application belongs to the technical field of power facilities, and particularly relates to an auxiliary ring network cabinet installation lifting device and a working method, two hydraulic lifting platforms used in combination side by side. Each hydraulic lifting platform comprises a base frame, a scissor arm assembly, a working platform and a jacking mechanism; the jacking mechanism comprises a hydraulic power unit and two hydraulic oil cylinders driven by the hydraulic power unit, the two oil cylinders are symmetrically arranged in the scissor arm assembly and used for driving the scissor arm to unfold or fold; the base frames of the two platforms are connected through a rigid connecting rod to form mechanical coupling; the hydraulic pipelines of the two oil cylinders of each platform are symmetrically arranged, and an independent throttle valve is arranged in the oil inlet and outlet pipeline of each oil cylinder. The two platforms are forced to be synchronous through the rigid connecting rod, and the four oil cylinders are symmetrically arranged and adjusted through the independent throttle valves, so that the lifting synchronous precision and the anti-unbalance load capacity are effectively improved under the premise that a closed-loop control system is not used, and the stability and the alignment accuracy of the ring network cabinet installation are ensured.

Description

Technical Field

[0001] This invention belongs to the field of power facility technology, specifically an auxiliary ring main unit installation lifting device and its working method. Background Technology

[0002] The statements in this section merely refer to the background art related to this invention and do not necessarily constitute prior art.

[0003] As a key piece of equipment in the power distribution network, the replacement and installation of ring main units requires high stability and positioning accuracy of the lifting device. Currently, scissor-type hydraulic lifting platforms are generally used to assist in the installation. These platforms are usually driven by hydraulic cylinders for lifting, and some heavy-duty platforms may involve dual hydraulic cylinder drives, with lifting on both sides achieved through diverter valves or mechanical synchronous shafts.

[0004] However, in practical applications, existing dual-cylinder drive solutions suffer from significant synchronization accuracy issues. When lifting ring main units weighing 2-3 tons, the load's center of gravity is difficult to align perfectly. Furthermore, differences in manufacturing tolerances, sealing friction resistance, and hydraulic pipeline pressure loss between the two cylinders cause the lifting height on both sides to be inconsistent, leading to platform tilting and cabinet instability. This not only makes precise cable drilling and alignment impossible but can also cause equipment damage or overturning accidents, posing a significant safety hazard.

[0005] The root cause of the above problems lies in the fact that existing solutions employ "open-loop" or "passive" synchronous control strategies, lacking the ability to perceive and dynamically compensate for the positional differences between the two sides in real time. Theoretically, a closed-loop control system can solve this problem, but it requires configuring an independent servo valve and displacement sensor for each cylinder, resulting in a significant increase in cost, system complexity, and poor adaptability to the harsh environment of the construction site. Summary of the Invention

[0006] This invention provides an auxiliary ring main unit installation lifting device and its working method. It adopts four hydraulic cylinders symmetrically arranged on both sides of the scissor mechanism. Through mechanical distribution optimization, the off-center load torque is distributed to multiple support points, reducing the impact of unilateral differences and improving the anti-off-center load capacity from the mechanical structure level, thereby enhancing the lifting synchronization accuracy and platform stability.

[0007] The first aspect of the present invention discloses an auxiliary ring main unit installation lifting device, comprising at least two hydraulic lifting platforms used in parallel, each hydraulic lifting platform comprising a base frame, a scissor arm assembly, a working platform and a lifting mechanism; The lifting mechanism includes a hydraulic power unit and a first hydraulic cylinder and a second hydraulic cylinder driven by the hydraulic power unit. The first hydraulic cylinder and the second hydraulic cylinder are respectively located inside the space enclosed by the scissor arm assembly and are symmetrically distributed with respect to the longitudinal centerline of the hydraulic lifting platform. The first hydraulic cylinder and the second hydraulic cylinder are respectively connected to the scissor arm assembly and are used to drive the scissor arm assembly to unfold or fold, so as to realize the lifting of the work platform. The base frames of the two hydraulic lifting platforms are connected by a rigid connecting rod to form a mechanical coupling structure, which is used to force the two hydraulic lifting platforms to maintain a fixed relative position during the lifting process; The hydraulic lines of the first and second hydraulic cylinders of each hydraulic lifting platform are arranged symmetrically, and each cylinder is equipped with an independent throttle valve in its inlet and outlet oil circuits to adjust the flow of each cylinder to achieve synchronous extension and retraction.

[0008] Furthermore, the scissor arm assembly is made of solid flat steel.

[0009] Furthermore, the work platform is made of anti-slip steel plate with folded edges.

[0010] Furthermore, the work platform is internally welded with a reinforced rectangular tube frame, forming a box-shaped composite structure.

[0011] Furthermore, each pivot point of the scissor arm assembly is equipped with a self-lubricating bearing.

[0012] Furthermore, each hydraulic cylinder has an integrated explosion-proof throttle valve in its oil circuit, which is used to quickly shut off the oil circuit in the event of a hydraulic hose rupture, preventing the work platform from stalling and falling.

[0013] Furthermore, the bottom of the base frame is equipped with casters for moving the device.

[0014] Furthermore, the bottom of the base frame is equipped with adjustable support legs for on-site positioning of the device.

[0015] Furthermore, the hydraulic power unit adopts an external design and is connected to the hydraulic cylinder via a high-pressure hose. The hydraulic power unit includes a motor, a hydraulic pump, an oil tank, and a control valve assembly.

[0016] The second aspect of the present invention discloses a method for operating an auxiliary ring main unit installation lifting device, comprising the following steps: Two hydraulic lifting platforms are arranged side by side and connected to the base frame of the two hydraulic lifting platforms by a rigid connecting rod, so that the two hydraulic lifting platforms form an integral load-bearing structure. The ring main unit was hoisted onto the working platforms of the two hydraulic lifting platforms; Start the hydraulic power unit of the two hydraulic lifting platforms. Hydraulic oil enters each hydraulic cylinder through an independent throttle valve. The piston rod of each hydraulic cylinder extends synchronously, pushing the scissor arm assembly to unfold and the work platform to rise. After reaching the predetermined height, stop and keep the work platform at the predetermined height. After the lifting operation is completed, the hydraulic system is depressurized. Under the weight of the ring main unit and the working platform, the piston rods of each hydraulic cylinder retract, the scissor arm assembly folds, and the working platform descends. During lifting, the base frames of the two hydraulic lifting platforms are forced to maintain a fixed relative position through rigid connecting rods, and the stroke difference of each hydraulic cylinder is suppressed by pre-adjusted independent throttle valves, so that each hydraulic cylinder keeps synchronous extension and retraction.

[0017] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects: By using two hydraulic lifting platforms side-by-side and employing rigid connecting rods to mechanically couple the base frames of the two platforms, the relative positions of the two platforms are forced to remain fixed during lifting, effectively eliminating the height difference problem that may occur when two independent platforms are running in traditional solutions. Simultaneously, two hydraulic cylinders are symmetrically arranged inside the scissor arm assembly of each platform. Combined with a symmetrical hydraulic pipeline design and independent throttle valve flow regulation, synchronous extension and retraction control of each cylinder is achieved. From a mechanical structure perspective, the traditional dual-cylinder drive "two-point support" layout is optimized into a four-cylinder "four-point support" layout, significantly reducing the impact of load center of gravity shift on the platform's posture. Without using an expensive closed-loop control system, this effectively improves lifting synchronization accuracy and anti-eccentric load capacity, ensuring stability and alignment accuracy during ring main unit installation, thereby reducing operational safety risks and improving construction efficiency. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1 A schematic diagram of the axial structure of an auxiliary ring main unit installation lifting device provided for one or more embodiments of the present invention; Figure 2 This is a side view of an auxiliary ring main unit installation lifting device provided for one or more embodiments of the present invention.

[0020] In the diagram: 1. Base frame, 2. Scissor arm assembly, 3. Working platform, 4. Lifting mechanism, 5. Connecting rod, 41. First hydraulic cylinder, 42. Second hydraulic cylinder. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] As described in the background section, existing dual-cylinder drive systems struggle to maintain consistent lifting heights on both sides when lifting ring main units weighing 2-3 tons. This is because the load's center of gravity is difficult to center perfectly, and differences in manufacturing tolerances, sealing friction resistance, and hydraulic pressure loss between the two cylinders lead to platform tilting and cabinet instability. This not only makes precise cable drilling and alignment impossible but also poses a significant safety hazard, potentially causing equipment damage or tipping accidents.

[0024] This solution provides an auxiliary ring main unit installation lifting device and working method. Four hydraulic cylinders are symmetrically arranged on both sides of the scissor mechanism. Through mechanical distribution optimization, the off-center load torque is distributed to multiple support points, reducing the impact of unilateral differences and improving the anti-off-center load capacity from the mechanical structure level, thereby enhancing the lifting synchronization accuracy and platform stability.

[0025] Example 1: An auxiliary ring main unit installation lifting device employs two identical hydraulic lifting platforms arranged side-by-side to jointly support the ring main unit. Each hydraulic lifting platform is an independent unit, and they are linked together through a synchronous control system.

[0026] like Figure 1 , Figure 2 As shown, each hydraulic lifting platform mainly consists of a base frame 1, a scissor arm assembly 2, a work platform 3, and a lifting mechanism 4. The base frame 1 is a rectangular steel structure with casters and adjustable outriggers at the bottom for easy on-site movement and positioning. The scissor arm assembly 2 adopts a single-scissor design, with its upper and lower ends hinged to the work platform 3 and the base frame 1, respectively. The lifting mechanism 4 is a hydraulic cylinder that drives the scissor arm to unfold or fold.

[0027] The two platforms are mechanically coupled through a rigid connecting rod 5, ensuring that they maintain a fixed relative position during lifting and lowering, forming an integral load-bearing structure.

[0028] The lifting mechanism 4 includes a hydraulic power unit and a first hydraulic cylinder 41 and a second hydraulic cylinder 42 driven by the hydraulic power unit. The two cylinders push their respective scissor arm assemblies 2 to lift their respective working platforms.

[0029] like Figure 2 As shown, each hydraulic lifting platform is equipped with two hydraulic cylinders with an inner diameter of 80mm (first hydraulic cylinder 41 and second hydraulic cylinder 42), and a total of four cylinders for the two platforms, which are symmetrically arranged in the scissor mechanism.

[0030] Specifically, the two hydraulic cylinders of each platform are respectively set inside the space enclosed by the scissor arm assembly 2, and are symmetrically distributed with respect to the longitudinal centerline of the platform. After the two platforms are combined side by side, the four hydraulic cylinders form a symmetrical support layout of "double row and double column". Each hydraulic cylinder forms a lifting point, and every two hydraulic cylinders jointly support the lifting area of ​​the platform. Each lifting area is located at one end of the support area.

[0031] From a mechanical perspective, the "dual-point lifting" formed by two hydraulic cylinders arranged side by side, compared to single-cylinder drive, distributes the lifting force to two points of application, reducing the stress load on a single hinge point. When the load center of gravity shifts, the force difference between the two cylinders can be self-balanced to a certain extent through the natural interconnectivity of their internal hydraulic systems, thereby reducing the sensitivity to center of gravity shift at the mechanical structure level.

[0032] Each hydraulic lifting platform is equipped with an independent hydraulic power unit, including a 220V / 1kW motor, hydraulic pump, oil tank, and control valve assembly. The power unit adopts an external design and is connected to the hydraulic cylinder via a high-pressure hose.

[0033] To improve the synchronization accuracy of the four cylinders, this solution adopts the following control strategy: The two platforms are mechanically synchronized by a rigid connecting rod 5, which forces them to maintain the same lifting height and eliminates the height difference that may occur due to the independent operation of the two platforms.

[0034] Each platform's two cylinders employ a completely symmetrical hydraulic pipeline design, including oil pipes of the same length and inner diameter, as well as hydraulic connectors of the same specifications, to minimize differences in pipeline pressure loss.

[0035] Each hydraulic cylinder is equipped with an independent throttle valve in its inlet and outlet oil circuits. During the initial commissioning of the equipment, the opening of each throttle valve is adjusted on-site to ensure that the four hydraulic cylinders maintain synchronous extension and contraction under both no-load and full-load conditions, achieving a passive synchronization effect of "one-time adjustment, long-term use".

[0036] Each hydraulic cylinder has an integrated explosion-proof throttle valve in its oil circuit. When the hydraulic hose ruptures unexpectedly, the valve can quickly shut off the oil circuit to prevent the platform from stalling and falling, thus ensuring operational safety.

[0037] To accommodate the four-cylinder layout and further suppress deformation caused by off-center loading, this design strengthens the mechanical structure as follows: Regarding the materials used in the scissor arm, the scissor arm assembly is made of solid flat steel of a specific size. Compared to conventional hollow square tubes, solid flat steel has a significantly higher section modulus of bending resistance and exhibits less elastic deformation when subjected to eccentric load moments, providing a rigid foundation for the four-cylinder synchronization.

[0038] In this embodiment, a design load of 4.0 tons is used to meet the lifting requirements of two ring main units (2.0 tons × 2). The scissor arms are made of 120mm × 20mm solid flat steel. Compared with the common hollow square tube scissor arms, solid flat steel has an advantage in bending section modulus, which helps to reduce elastic deformation and swaying under load, and provides a more stable foundation for fine adjustment when the cabinet is in place.

[0039] Regarding the work platform, it is made of anti-slip steel plate of a certain thickness with folded edges and internally welded reinforced rectangular tube frame to form a box-shaped composite structure, ensuring that the bearing surface does not deform under local heavy pressure.

[0040] In this embodiment, the working platform uses a 6mm anti-slip plate and is reinforced with a built-in rectangular tube, which further ensures the local rigidity of the bearing plane.

[0041] Self-lubricating bearings are installed at each pivot point of the scissor lift to reduce frictional resistance and minimize asynchronous movement caused by hinge point jamming.

[0042] Work process: During operation, first place the two hydraulic lifting platforms side by side and fix them with rigid connecting rods 5 to form an integral load-bearing structure. Hoist the ring main unit onto the working platform 3 and adjust the adjustable outriggers to ensure the equipment lands stably on the ground.

[0043] The operator issues a lifting command via the control box, and the two power units start synchronously. Hydraulic oil enters the four cylinders through the throttle valve. The cylinder piston rods extend synchronously, pushing the scissor arm assembly 2 to unfold, and the work platform 3 rises smoothly. During the lifting process, the difference in stroke of the four cylinders can be suppressed by the pre-adjusted throttle valve, and the rigid connecting rod 5 further forces the two platforms to remain level.

[0044] Once the predetermined height is reached, releasing the control button will allow the platform to reliably remain at any position. During cable drilling and alignment, the operator can perform millimeter-level fine adjustments using jog controls, maintaining platform stability and facilitating precise alignment.

[0045] During descent, the control box issues a descent command, the hydraulic system is depressurized, and under the weight of the platform and load, the cylinder piston rod retracts, the scissor arms fold, and the platform descends smoothly. An explosion-proof throttle valve controls the return oil speed, achieving a smooth and controlled descent and avoiding impact.

[0046] By employing a comprehensive set of technical measures, including a symmetrical four-cylinder lifting layout, mechanical synchronous coupling, symmetrical arrangement of hydraulic pipelines, and independent adjustment of throttle valves, the lifting synchronization accuracy is effectively improved from a mechanical structure perspective. The four cylinders form four-point support, dispersing the off-center load torque and reducing sensitivity to center of gravity shifts. Rigid connecting rods force the two platforms to synchronize, eliminating height differences during independent operation. Solid flat steel scissor arms provide sufficient resistance to deformation, creating a rigid foundation for precise synchronization. This design achieves synchronous lifting accuracy that meets the installation requirements of the ring main unit without using an expensive closed-loop control system, balancing reliability, economy, and field applicability.

[0047] Example 2: A method for using an auxiliary ring main unit installation lifting device includes the following steps: Two hydraulic lifting platforms are arranged side by side and connected to the base frame of the two hydraulic lifting platforms by a rigid connecting rod, so that the two hydraulic lifting platforms form an integral load-bearing structure. The ring main unit was hoisted onto the working platforms of the two hydraulic lifting platforms; The control box sends a lifting command to start the hydraulic power unit of the two hydraulic lifting platforms, and the hydraulic oil enters each hydraulic cylinder through an independent throttle valve. The piston rods of each hydraulic cylinder extend synchronously, pushing the scissor arm assembly to unfold and raising the work platform; During the lifting process, the base frames of the two hydraulic lifting platforms are forced to maintain a fixed relative position through rigid connecting rods, and the stroke difference of each hydraulic cylinder is suppressed by pre-adjusted independent throttle valves, so that each hydraulic cylinder keeps synchronous extension and retraction. Once the predetermined height is reached, the control box is used to stop the ascent, causing the work platform to remain at the predetermined height. The control box issues a descent command, the hydraulic system is depressurized, and under the weight of the ring main unit and the work platform, the piston rods of each hydraulic cylinder retract, the scissor arm assembly folds, and the work platform descends.

[0048] By using two hydraulic lifting platforms side-by-side and employing rigid connecting rods to mechanically couple the base frames of the two platforms, the relative positions of the two platforms are forced to remain fixed during lifting, effectively eliminating the height difference problem that may occur when two independent platforms are running in traditional solutions. Simultaneously, two hydraulic cylinders are symmetrically arranged inside the scissor arm assembly of each platform. Combined with a symmetrical hydraulic pipeline design and independent throttle valve flow regulation, synchronous extension and retraction control of each cylinder is achieved. From a mechanical structure perspective, the traditional dual-cylinder drive "two-point support" layout is optimized into a four-cylinder "four-point support" layout, significantly reducing the impact of load center of gravity shift on the platform's posture. Without using an expensive closed-loop control system, this effectively improves lifting synchronization accuracy and anti-eccentric load capacity, ensuring stability and alignment accuracy during ring main unit installation, thereby reducing operational safety risks and improving construction efficiency.

[0049] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An auxiliary ring main unit installation lifting device, characterized in that, It includes at least two hydraulic lifting platforms used side by side, each hydraulic lifting platform including a base frame, a scissor arm assembly, a work platform and a lifting mechanism; The lifting mechanism includes a hydraulic power unit and a first hydraulic cylinder and a second hydraulic cylinder driven by the hydraulic power unit. The first hydraulic cylinder and the second hydraulic cylinder are respectively located inside the space enclosed by the scissor arm assembly and are symmetrically distributed with respect to the longitudinal centerline of the hydraulic lifting platform. The first hydraulic cylinder and the second hydraulic cylinder are respectively connected to the scissor arm assembly and are used to drive the scissor arm assembly to unfold or fold, so as to realize the lifting of the work platform. The base frames of the two hydraulic lifting platforms are connected by a rigid connecting rod to form a mechanical coupling structure, which is used to force the two hydraulic lifting platforms to maintain a fixed relative position during the lifting process; The hydraulic lines of the first and second hydraulic cylinders of each hydraulic lifting platform are arranged symmetrically, and each cylinder is equipped with an independent throttle valve in its inlet and outlet oil circuits to adjust the flow of each cylinder to achieve synchronous extension and retraction.

2. The auxiliary ring main unit installation lifting device as described in claim 1, characterized in that, The scissor arm assembly is made of solid flat steel.

3. The auxiliary ring main unit installation lifting device as described in claim 1, characterized in that, The work platform is formed by folding the edges of anti-slip steel plate.

4. The auxiliary ring main unit installation lifting device as described in claim 1, characterized in that, The working platform has a reinforced rectangular tube frame welded inside, forming a box-shaped composite structure.

5. The auxiliary ring main unit installation lifting device as described in claim 1, characterized in that, Each pivot point of the scissor arm assembly is equipped with a self-lubricating bearing.

6. The auxiliary ring main unit installation lifting device as described in claim 1, characterized in that, Each hydraulic cylinder has an integrated explosion-proof throttle valve in its oil circuit, which is used to quickly shut off the oil circuit in the event of a hydraulic hose rupture, preventing the work platform from stalling and falling.

7. The auxiliary ring main unit installation lifting device as described in claim 1, characterized in that, The base frame is equipped with casters at the bottom for moving the device.

8. The auxiliary ring main unit installation lifting device as described in claim 1, characterized in that, The bottom of the base frame is equipped with adjustable support legs for on-site positioning of the device.

9. The auxiliary ring main unit installation lifting device as described in claim 1, characterized in that, The hydraulic power unit adopts an external design and is connected to the hydraulic cylinder through a high-pressure hose. The hydraulic power unit includes a motor, a hydraulic pump, an oil tank, and a control valve group.

10. A method for operating the auxiliary ring main unit installation lifting device as described in claim 1, characterized in that, Includes the following steps: Two hydraulic lifting platforms are arranged side by side and connected to the base frame of the two hydraulic lifting platforms by a rigid connecting rod, so that the two hydraulic lifting platforms form an integral load-bearing structure. The ring main unit was hoisted onto the working platforms of the two hydraulic lifting platforms; Start the hydraulic power unit of the two hydraulic lifting platforms. Hydraulic oil enters each hydraulic cylinder through an independent throttle valve. The piston rod of each hydraulic cylinder extends synchronously, pushing the scissor arm assembly to unfold and the work platform rises. After reaching the predetermined height, the platform stops, allowing it to remain at the predetermined height. After the lifting operation is completed, the hydraulic system is depressurized. Under the weight of the ring main unit and the working platform, the piston rods of each hydraulic cylinder retract, the scissor arm assembly folds, and the working platform descends. During lifting, the base frames of the two hydraulic lifting platforms are forced to maintain a fixed relative position through rigid connecting rods, and the stroke difference of each hydraulic cylinder is suppressed by pre-adjusted independent throttle valves, so that each hydraulic cylinder keeps synchronous extension and retraction.

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