An assembled frequency converter hoisting tool

Abstract

An assembled frequency converter hoisting tool, comprising a foldable support assembly, a telescopic hoisting beam assembly and a hoisting mechanism, which are detachably connected; the foldable support assembly has two ends connected to the two ends of the hoisting beam assembly as hoisting support bases; the hoisting mechanism is connected to the hoisting beam assembly, and the hoisting mechanism hoists the frequency converter through a traction rope; the tool is suitable for narrow spaces, greatly improves work efficiency, is accurate in adjustment, convenient to install, significantly improves safety, is highly versatile and has low operation threshold.

Description

Technical Field

[0001] This invention relates to the field of power plant equipment installation and maintenance tools, specifically to a special hoisting tool for frequency converters in power plant air-cooled systems, suitable for disassembling, replacing and installing heavy frequency converters in confined spaces. Background Technology

[0002] In the daily operation and maintenance of power plants, air-cooled frequency converters, as the core control equipment of the air-cooling system, operate under high load for extended periods, making them prone to failure and requiring regular maintenance or replacement. These frequency converters are characterized by their large weight (80-200kg) and regular shape, but their installation area is mostly located below the air-cooling island, surrounded by dense pipes, cables, and steel structure supports, creating a confined working environment with limited lateral operating space and restricted longitudinal lifting path. Furthermore, the lack of large hoisting equipment makes replacement work extremely inconvenient.

[0003] A triangular frame made of welded steel pipes is erected above the inverter installation area. A hand-operated hoist is suspended from the top of the frame. The inverter's lifting point is connected to a hook by hand, and pulling the hoist raises or lowers the inverter. Multiple people work together to adjust the inverter's lateral position for disassembly or installation. However, the triangular frame is bulky, making it difficult to assemble in confined spaces of ≤1.5m. It also occupies operating space and can easily interfere with surrounding equipment. It lacks precise adjustment capabilities, and lateral displacement and posture adjustment rely on manual pushing, which can easily lead to inverter imbalance and collisions. It requires 4-6 people to work together, resulting in high labor intensity and low efficiency; replacing a single inverter takes 2-3 hours. Furthermore, it has poor stability, lacks a safety locking device, and poses safety risks of equipment falling and personnel injuries.

[0004] This system uses a small electric hoist paired with a fixed-length lifting beam. The electric hoist is fixed to a temporary support point at the top, and hooks at both ends of the lifting beam connect to the inverter's lifting points. Lifting and lowering are achieved via the electric hoist, and lateral displacement is adjusted by moving the hoist's installation position. However, the fixed beam length makes it unsuitable for inverters of varying widths and operating spaces, resulting in poor versatility. The lack of a posture adjustment mechanism means it cannot correct tilted inverters, making alignment with the installation interface difficult. Relying on a fixed top support point renders it unusable when such points are scarce in power plants. Furthermore, the absence of overload protection and anti-detachment devices increases the risk of equipment falling in the event of a hoist malfunction, posing a safety concern. Summary of the Invention

[0005] To address the problems of traditional hoisting tools being bulky, unsuitable for confined spaces, having low adjustment precision, poor work efficiency, and high safety risks when replacing air-cooled frequency converters in power plants, this paper provides a modular, foldable, and precisely adjustable specialized hoisting tool that enables single or double operators to efficiently and safely complete frequency converter replacement work in confined spaces.

[0006] An assembled inverter hoisting tool includes a foldable support assembly, a telescopic lifting beam assembly, and a hoisting mechanism, characterized in that the components are detachably connected. Two foldable support components are provided, which serve as the lifting support base and are connected to both ends of the lifting beam component; The hoisting mechanism is connected to the lifting beam assembly, and the hoisting mechanism lifts the frequency converter using traction ropes.

[0007] Furthermore, the foldable support assembly includes two foldable aluminum alloy uprights, a horizontal connecting rod, and adjustable feet. The uprights adopt a two-section folding structure, and the uprights are equipped with a telescopic mechanism inside. After unfolding, the telescopic mechanism enables stepless adjustment to adapt to different longitudinal spaces. The horizontal connecting rod connects the middle of the two uprights to form a stable triangular support structure.

[0008] Furthermore, the upper ends of the two foldable aluminum alloy uprights are pivotally connected to form a hollow mounting hole; the mounting hole is used to install the telescopic lifting beam assembly.

[0009] Furthermore, the head of the transverse connecting rod has an attitude adjustment knob, which can adjust the length of the transverse connecting rod within a small range, thereby adjusting the height of the support assembly. In conjunction with the level bubble level on the suspension beam assembly, this ensures that the suspension beam assembly is in a horizontal state.

[0010] Furthermore, the telescopic lifting beam assembly adopts a high-strength hollow aluminum alloy lifting beam with a built-in telescopic arm, which can be telescopically adapted to frequency converters of different widths; the telescopic arm is locked with a positioning pin, and the length is fixed after adjustment to prevent displacement.

[0011] Furthermore, the bottom of the lifting beam is equipped with a sliding rail for lateral displacement in conjunction with the lifting mechanism.

[0012] Furthermore, the hoisting mechanism serves as a hoisting frequency converter and position adjustment component, integrating a longitudinal lifting mechanism and a lateral adjustment mechanism; Its upper part is a lateral adjustment mechanism, which is connected to the lifting beam via a slide rail and uses a screw drive. It can move along the slide rail.

[0013] Furthermore, the lower longitudinal lifting mechanism of the hoisting mechanism has a rope wound on its output shaft, with a hook connected to the lower end of the rope for connecting to the standard lifting points of the frequency converter for hoisting.

[0014] Furthermore, it also includes a safety locking component. The safety locking component is installed on the input shaft of the hoisting mechanism and adopts a ratchet-type self-locking structure, which only allows unidirectional rotational torque input.

[0015] A method for using the above-mentioned assembled frequency converter hoisting tool, characterized in that, S1. Assembly: The operators bring each component to the site, unfold the foldable support component, fix the telescopic lifting beam component to the support component through quick connectors, adjust the telescopic length of the lifting beam according to the width of the frequency converter and insert the positioning pin; install the lifting mechanism and safety locking component. S2. Disassembly: Connect the hook to the inverter lifting point and fasten the anti-detachment buckle; use the longitudinal lifting mechanism to lift the inverter to the point where it is detached from the mounting base; operate the lateral adjustment mechanism to move the inverter to a safe area of ​​the work space and lower the inverter to the ground to complete the disassembly. S3. Installation: Reverse step S2 above, raise the inverter to the installation height, and use the lateral adjustment mechanism to correct the inverter's position and angle, aligning it with the mounting base interface; lower the inverter to the mounting base, and after securing it, remove the hooks and tools. The operation is now complete.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Adaptable to confined spaces: The tool is small in size and light in weight after folding, and can be flexibly deployed in ≤1.5m horizontal space and ≤3m vertical space, avoiding interference with surrounding equipment and solving the problem that traditional tools cannot enter confined areas; 2. Significantly improved work efficiency: Modular assembly is quick and convenient, and a single person can complete the tool operation. The number of workers has been reduced from 4-6 people to 1-2 people, and the replacement time of a single frequency converter has been shortened from 2-3 hours to 30-60 minutes, improving efficiency by more than 60%. 3. Precise adjustment and convenient installation: It integrates a multi-dimensional precision adjustment mechanism to achieve millimeter-level control of lifting, translation and posture, easily aligning with the installation interface and avoiding equipment bumps and installation deviations; 4. Significantly improved safety: Multiple safety locking components eliminate the risk of equipment falling or falling off, and the load alarm function prevents overload, reducing operational safety risks by more than 90%. 5. High versatility: It is compatible with air-cooled frequency converters of different weights and widths from 80-200kg, without the need to replace special parts, reducing tool purchase and maintenance costs; 6. Low operating threshold: Simple structure and easy operation, no professional skills training required, power plant operation and maintenance personnel can quickly get started, suitable for daily maintenance and emergency repair scenarios. Attached Figure Description

[0017] Figure 1 This is a diagram showing the tool connections; Figure 2 This is a side view of the pole; In the diagram: 1 Foldable aluminum alloy upright, 2 Horizontal connecting rod, 3 Adjustable feet, 4 Posture adjustment knob, 5 Mounting hole, 6 Folding shaft, 7 Telescopic lifting beam, 8 Slide rail, 9 Horizontal adjustment mechanism, 10 Vertical lifting mechanism, 11 Input socket. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0019] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is described as "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," "top," "bottom," and similar expressions used in this document are for illustrative purposes only.

[0020] The present invention relates to a specialized hoisting tool for air-cooled frequency converters in power plants operating in confined spaces. This tool features a modular design, comprising a foldable support assembly, a telescopic lifting beam assembly, a hoisting mechanism, and a safety locking assembly. All components are detachably connected via quick-connect couplings. The overall weight is ≤30kg, making it easy to carry and deploy in confined spaces. like Figure 1 , 2 As shown, the specific structure is as follows: An assembled inverter hoisting tool includes a foldable support assembly, a telescopic lifting beam assembly, and a hoisting mechanism.

[0021] The foldable support assembly includes two foldable aluminum alloy uprights, a horizontal connecting rod, and adjustable feet. The uprights adopt a two-section folding structure, with a folded length of ≤0.8m. The uprights are equipped with a telescopic mechanism, which allows for stepless adjustment from 1.5m to 3m when unfolded, adapting to different longitudinal spaces. The horizontal connecting rod connects the middle of the two uprights to form a stable triangular support structure. The head of the transverse connecting rod has an attitude adjustment knob, which can adjust the length of the transverse connecting rod within a small range, thereby adjusting the height of the support assembly. Together with the level bubble level on the lifting beam assembly, it can ensure that the lifting beam assembly is in a horizontal state that is adapted to the ground.

[0022] The base is equipped with anti-slip rubber pads, which can be finely adjusted to fit uneven ground, and can support a load of ≥300kg to ensure hoisting stability.

[0023] The upper ends of two foldable aluminum alloy uprights are pivotally connected to form hollow mounting holes. These mounting holes are used to install telescopic lifting beam assemblies.

[0024] The telescopic lifting beam assembly uses a high-strength hollow aluminum alloy lifting beam with a built-in telescopic arm. The telescopic range is 0.8-1.5m, compatible with frequency converters of different widths weighing 80-200kg. The telescopic arm is locked with a positioning pin, fixing the length after adjustment to prevent displacement. The telescopic beam structure can be hydraulically driven, using a small hydraulic pump for automatic extension and retraction, improving adjustment efficiency. The bottom of the lifting beam is equipped with a slide rail to cooperate with the lateral adjustment mechanism in the lifting mechanism; detachable hooks are installed at both ends of the lifting beam, and the inside of the hooks is wrapped with anti-slip rubber sleeves to avoid damaging the surface of the equipment. The hooks are compatible with the standard lifting points and reserved installation holes of the frequency converter, making them highly versatile.

[0025] The hoisting mechanism serves as a lifting frequency converter and position adjustment component, integrating a longitudinal lifting mechanism and a lateral adjustment mechanism.

[0026] Its upper part is a lateral adjustment mechanism, which is connected to the lifting beam via a slide rail and uses a screw drive. It can move along the slide rail.

[0027] The lower part is a longitudinal lifting mechanism, which is equipped with a manual screw jack (transmission ratio 1:20), which is realized by using worm gear and worm drive. It is equipped with a detachable crank to realize the smooth lifting of the frequency converter and avoid impact damage. A safety locking component is installed on its input shaft, which adopts a pawl self-locking structure, allowing only unidirectional rotation torque input to prevent accidental fall.

[0028] The crank handle and the input shaft are connected by a socket. The socket can be used with a small electric drive module and equipped with a rechargeable battery to realize electric lifting, further reducing labor intensity and adapting to long-term, multi-unit hoisting operations. A rope is wound around the output shaft of the longitudinal lifting mechanism, and a hook is connected to the lower end of the rope for connecting to the standard lifting points of the frequency converter for hoisting. The hook is equipped with an anti-detachment buckle that automatically locks after connection to prevent it from falling off during hoisting.

[0029] The lower end of the rope can also be connected to an adjustable-width clamping structure to adapt to special-specification frequency converters without standard suspension points, thus expanding the range of applications.

[0030] In practical applications, the lifting tool of the present invention, S1. Assembly: The operators bring each component to the site, unfold the foldable support component, fix the telescopic lifting beam component and the support component with quick connectors, adjust the telescopic length of the lifting beam according to the width of the frequency converter and insert the positioning pin; install the lifting mechanism and safety locking component. The entire assembly time is ≤5 minutes.

[0031] 2. For disassembly, connect the hook to the inverter's lifting point and fasten the anti-detachment buckle; use the longitudinal lifting mechanism to lift the inverter to a position detached from the mounting base (height ≥ 100mm); operate the lateral adjustment mechanism to move the inverter to a safe area in the work space; slowly lower the inverter to the ground to complete the disassembly.

[0032] 3. Installation: Reverse the steps above to raise the inverter to the installation height. Use the lateral adjustment mechanism to correct the inverter's position and angle, and accurately align it with the installation interface. Slowly lower the inverter to the mounting base, and after securing it, remove the hooks and tools. The operation is now complete.

[0033] Finally, it should be noted that the above description is merely an explanation of the present invention and is not intended to limit the invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular inverter hoisting tool, comprising a foldable support assembly, a telescopic lifting beam assembly, and a hoisting mechanism, characterized in that, Detachable connections between components; Two foldable support components are provided, which serve as the lifting support base and are connected to both ends of the lifting beam component; The hoisting mechanism is connected to the lifting beam assembly, and the hoisting mechanism lifts the frequency converter using traction ropes.

2. The assembled inverter hoisting tool according to claim 1, characterized in that, The foldable support assembly includes two foldable aluminum alloy uprights, a horizontal connecting rod, and adjustable feet. The uprights adopt a two-section folding structure and have a telescopic mechanism inside. After unfolding, the telescopic mechanism enables stepless adjustment to adapt to different longitudinal spaces. The horizontal connecting rod connects the middle of the two uprights to form a stable triangular support structure.

3. The assembled inverter hoisting tool according to claim 2, characterized in that, The upper ends of the two foldable aluminum alloy uprights are pivotally connected to form a hollow mounting hole; the mounting hole is used to install the telescopic lifting beam assembly.

4. The assembled inverter hoisting tool according to claim 2, characterized in that, The head of the transverse connecting rod has an attitude adjustment knob, which can adjust the length of the transverse connecting rod within a small range, thereby adjusting the height of the support assembly. In conjunction with the level bubble level on the suspension beam assembly, it ensures that the suspension beam assembly is in a horizontal state.

5. The assembled inverter hoisting tool according to claim 1, characterized in that, The telescopic lifting beam assembly uses a high-strength hollow aluminum alloy lifting beam with a built-in telescopic arm, which can be extended and retracted to adapt to frequency converters of different widths and specifications; the telescopic arm is locked with a positioning pin, and the length is fixed after adjustment to prevent displacement.

6. The assembled frequency converter hoisting tool according to claim 5, characterized in that, The bottom of the lifting beam is equipped with a sliding rail for lateral displacement in conjunction with the lifting mechanism.

7. The assembled frequency converter hoisting tool according to claim 6, characterized in that, The hoisting mechanism serves as a lifting frequency converter and position adjustment component, integrating a longitudinal lifting mechanism and a lateral adjustment mechanism. Its upper part is a lateral adjustment mechanism, which is connected to the lifting beam via a slide rail and uses a screw drive. It can move along the slide rail.

8. The assembled frequency converter hoisting tool according to claim 7, characterized in that, The lower longitudinal lifting mechanism of the hoisting mechanism has a rope wound on the output shaft, and the lower end of the rope is connected to a hook for connecting to the standard lifting points of the frequency converter for hoisting.

9. The assembled frequency converter hoisting tool according to claim 7, characterized in that, It also includes a safety locking component. The safety locking component is installed on the input shaft of the hoisting mechanism and adopts a ratchet self-locking structure, which only allows unidirectional rotational torque input.

10. A method of using the assembled frequency converter hoisting tool according to claim 1, characterized in that, S1. Assembly: The operators bring each component to the site, unfold the foldable support component, fix the telescopic lifting beam component to the support component through quick connectors, adjust the telescopic length of the lifting beam according to the width of the frequency converter and insert the positioning pin; install the lifting mechanism and safety locking component. S2. Disassembly: Connect the hook to the inverter lifting point and fasten the anti-detachment buckle; use the longitudinal lifting mechanism to lift the inverter to the point where it is detached from the mounting base; operate the lateral adjustment mechanism to move the inverter to a safe area of ​​the work space and lower the inverter to the ground to complete the disassembly. S3. Installation: Reverse step S2 above, raise the inverter to the installation height, and use the lateral adjustment mechanism to correct the inverter's position and angle, aligning it with the mounting base interface; lower the inverter to the mounting base, and after securing it, remove the hooks and tools. The operation is now complete.

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