Truss-structure-based maintenance arch frame for circular crane

Abstract

The invention provides a maintenance arch frame based on a truss structure for a circular crane, and relates to the technical field of nuclear power crane equipment, the maintenance arch frame comprises a rigid supporting leg, electrical equipment, a cross beam, an electric hoist, a connecting device and a flexible supporting leg; the rigid supporting leg and the flexible supporting leg are connected with the cross beam through the connecting device, the electric hoist is connected to the cross beam, and the electric hoist walks between the rigid supporting leg and the flexible supporting leg in the direction of the cross beam to conduct overhauling work. An arch frame structure composed of the supporting legs and the cross beams is adopted, so that the space occupied by overhaul work is greatly reduced; the maintenance platform is arranged at the rigid supporting legs, so that the maintenance work is convenient, and the safety is improved; the arch support legs adopt two different forms of rigid support legs and flexible support legs, so that the overall anti-seismic requirement of the circular crane can be better met, and the stress is released; and the connecting devices among the rigid supporting legs, the flexible supporting legs and the cross beams adopt a flexible connecting form of hinge shafts, so that slight deformation of the arch frame due to stress can be borne, and the service life of the overhauling arch frame is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power crane equipment, and more particularly, to an overhaul arch based on a truss structure for a gantry crane. Background Art

[0002] The self-provided overhaul arch is one of the important components of a gantry crane. Its function is to ensure that during the operation of the crane, if a certain component of the trolley fails, it can be repaired immediately, ensuring that the fault is repaired within a short time and ensuring the smooth operation of the crane trolley. As an important lifting equipment in a nuclear power plant, the gantry crane has high requirements for safety and reliability. After an earthquake, it is required to continue operating after inspecting its components, and a single-fault protection is required for the trolley.

[0003] The technology adopted by the existing device for repairing trolley components on a gantry crane is a cantilever maintenance hoist. This device adopts the form of a rotating cantilever beam plus an electric hoist and is installed on the trolley frame of the crane trolley. Its structure has the following disadvantages:

[0004] 1. The cantilever maintenance hoist is huge in volume and occupies a large space above the trolley. Moreover, the height of the cantilever maintenance hoist is limited, and some components at higher horizontal heights cannot be repaired. When the cantilever of the maintenance hoist rotates, it is easy to collide with some components.

[0005] 2. The cantilever maintenance hoist can only perform lifting work. If repairing trolley components, the maintenance hoist needs to be used in cooperation with a hydraulic lifting platform, further compressing the space above the trolley and making the maintenance work more difficult.

[0006] Based on the high requirements for the safety and reliability of the gantry crane and the disadvantages of the existing technology, a new type of self-provided overhaul arch needs to be developed, whose working principle is simple, convenient, safe and reliable, and has a large working service range. Summary of the Invention

[0007] In view of the above-mentioned technical problems of limited maintenance and difficult maintenance of the existing cantilever device, an overhaul arch based on a truss structure for a gantry crane is provided. The present invention mainly uses an arch structure composed of legs and crossbeams to greatly reduce the occupied space for maintenance work, sets a maintenance platform at the rigid legs, making the maintenance work convenient and improving safety.

[0008] The technical means adopted by the present invention are as follows:

[0009] An overhaul arch based on a truss structure for a gantry crane, comprising rigid legs, electrical equipment, crossbeams, electric hoists, connecting devices and flexible legs;

[0010] The rigid legs and flexible legs are connected to the crossbeam through a connecting device. The electric hoist is connected to the crossbeam, and the electric hoist travels between the rigid legs and the flexible legs along the direction of the crossbeam for maintenance work.

[0011] Further, the rigid leg includes a leg frame, a maintenance platform, and a straight ladder. The maintenance platform is connected to the leg frame, and the straight ladder is used to connect the bridge girder and the maintenance platform.

[0012] Further, the connecting device consists of a hinge shaft, an adjusting bushing, an end baffle, and fasteners. The hinge shaft is used to connect the rigid leg, the flexible leg, and the crossbeam, and the adjusting bushing and the end baffle are used to fix the hinge shaft.

[0013] Further, the traveling device of the electric hoist is connected to the lower cover plate of the crossbeam.

[0014] Further, the electrical equipment is connected to the lower cover plate on one side of the crossbeam.

[0015] Further, the maintenance arch is arranged perpendicular to the direction of the main girder and is installed on the brackets of the main girders in the electrical room and non-electrical room of the bridge.

[0016] Working principle: When the circular crane is working, a fault may occur in a certain component of the trolley, resulting in the suspension of the lifting operation of the circular crane. At this time, the trolley can be run under the self-provided maintenance arch, and the electric hoist runs above the faulty component to lift the faulty component to the maintenance platform of the rigid leg (1) for maintenance. After the maintenance is completed, the repaired component is put back to its original place by the electric hoist, thus ensuring the normal operation of the trolley of the circular crane.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The layout form has changed greatly. The arch structure composed of legs and crossbeams is adopted, which greatly reduces the space occupied by the maintenance work.

[0019] 2. A maintenance platform is arranged at the rigid leg, which makes the maintenance work convenient and improves the safety.

[0020] 3. The arch legs adopt two different forms of rigid legs and flexible legs, which can better meet the seismic requirements of the whole circular crane and release stress.

[0021] 4. The connecting device between the rigid leg, the flexible leg and the crossbeam adopts the flexible connection form of the hinge shaft, which can bear the slight deformation of the arch under stress and extend the service life of the maintenance arch. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0023] Figure 1 It is the structural diagram of the self-provided maintenance arch frame of the present invention.

[0024] Figure 2 It is the structural schematic diagram of the rigid leg in the present invention.

[0025] Figure 3 It is the structural schematic diagram of the connecting device in the present invention.

[0026] In the figure: 1. Rigid leg; 11. Leg frame; 12. Maintenance platform; 13. Straight ladder; 2. Electrical equipment; 3. Cross beam; 4. Electric hoist; 5. Connecting device; 51. Hinge shaft; 52. Adjusting bushing; 53. Shaft end baffle; 6. Flexible leg. Detailed implementation manners

[0027] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will describe the present invention in detail with reference to the accompanying drawings and in combination with the embodiments.

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] It should be noted that the terms used here are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention. As used here, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0030] Such as Figures 1-3As shown in the figure, the present invention provides an inspection arch frame based on a truss structure for a gantry crane, which is arranged perpendicular to the main girder direction and installed on the brackets of the main girders in the electrical room and non-electrical room of the bridge.

[0031] As Figure 1 shown in the figure, an inspection arch frame based on a truss structure for a gantry crane is composed of a rigid leg 1, electrical equipment 2, a cross beam 3, an electric hoist 4, a connecting device 5, and a flexible leg 6; the rigid leg 1 and the flexible leg 6 are connected to the cross beam 3 through the connecting device 5. The traveling device of the electric hoist 4 is hung on the lower cover plate of the cross beam 3, and the electric hoist 4 can travel between the rigid leg 1 and the flexible leg 6 along the direction of the cross beam 3 for inspection work.

[0032] As Figure 2 shown in the figure, the rigid leg 1 is composed of a leg frame 11, an inspection platform 12, and a straight ladder 13. The inspection platform 12 is connected to the leg frame 11, and the straight ladder 13 is used to connect the bridge main girder and the inspection platform 12.

[0033] As Figure 3 shown in the figure, the connecting device 5 is composed of a hinge shaft 51, an adjusting bushing 52, an end baffle 53, and fasteners, etc. The hinge shaft 51 is used to connect the rigid leg 1, the flexible leg 6, and the cross beam 3, and the adjusting bushing 52 and the end baffle 53 are used to fix the hinge shaft 51.

[0034] The layout form of the present invention has changed greatly. It has been changed from the cantilever maintenance crane originally installed on the trolley to the arch frame form installed on both sides of the main girder. By adopting this form, the space of the trolley occupied by the maintenance work is greatly reduced. An inspection platform 12 is set at the rigid leg 1, which makes the inspection work convenient and improves the safety. When carrying out the inspection work, one can directly go up to the inspection platform 12 along the straight ladder 13 on the bridge main girder to carry out the component inspection work.

[0035] Working principle:

[0036] When the gantry crane is working, a situation may occur where a certain component of the trolley fails, resulting in the suspension of the lifting operation of the gantry crane. At this time, the trolley can be run to the lower part of the self-provided inspection arch frame, and the electric hoist 4 is run to the upper part of the faulty component, and the faulty component is lifted to the inspection platform 12 of the rigid leg 1 for inspection. After the inspection is completed, the repaired component is put back to its original place by the electric hoist 4, so as to ensure the normal operation of the trolley of the gantry crane.

[0037] The present invention is applicable to the gantry crane in a nuclear power plant, and is also applicable to equipment that needs to ensure that the trolley of the crane can be repaired for faults at any time. It is expected to be used in the gantry cranes of Units 1 / 2 of the CX project of CNNC Energy and the gantry cranes of Units 5 / 6 of Zhejiang Sanmen Nuclear Power Plant, etc.

[0038] Nuclear power plants use self-provided maintenance arches with transfer trolley components for maintenance functions. This technology is mainly applied to ensure the stability of the operation of the trolley of the ring crane in the nuclear island building of the nuclear power plant, breaking the limitation of the traditional cantilever maintenance crane that only has the function of transfer components. It can avoid the situation where the ring crane trolley cannot perform the hoisting work under special working conditions by transferring components to the maintenance platform, and can ensure that the self-provided maintenance arch can release stress to meet the seismic function through the particularity of its own structure under special circumstances, meeting the requirements of high safety of nuclear power plant equipment.

[0039] After the application of the present invention in the ring crane of the nuclear power plant, the economic benefit of a single set can reach more than 300,000 yuan, and it is expected to bring direct economic benefits of more than 5 million yuan per year.

[0040] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A maintenance arch based on a truss structure for a circular crane, characterized in that: It comprises a rigid support leg (1), an electrical device (2), a crossbeam (3), an electric hoist (4), a connecting device (5) and a flexible support leg (6); The rigid legs (1) and the flexible legs (6) are connected to the crossbeam (3) via a connecting device (5); the electric hoist (4) is connected to the crossbeam (3); and the electric hoist (4) moves along the direction of the crossbeam (3) between the rigid legs (1) and the flexible legs (6) to perform maintenance work.

2. The truss structure-based maintenance arch for the circular crane according to claim 1, characterized in that: The rigid support leg (1) comprises a support leg frame (11), a maintenance platform (12) and a vertical ladder (13); the maintenance platform (12) is connected to the support leg frame (11); and the vertical ladder (13) is used to connect the bridge frame main beam and the maintenance platform (12).

3. The truss structure-based maintenance arch for the circular crane according to claim 1, characterized in that: The connecting device (5) comprises a hinge shaft (51), an adjusting shaft sleeve (52), a shaft end baffle (53) and a fastener; the hinge shaft (51) is used to connect the rigid support leg (1), the flexible support leg (6) and the crossbeam (3); the adjusting shaft sleeve (52) and the shaft end baffle (53) are used to fix the hinge shaft (51).

4. The truss structure-based maintenance arch for the circular crane according to claim 1, characterized in that: The traveling device of the electric hoist (4) is connected to the lower cover plate of the crossbeam (3).

5. The truss structure-based maintenance arch for the circular crane according to claim 1, characterized in that: The electrical equipment (2) is connected to the lower cover plate on one side of the crossbeam (3).

6. The truss structure-based maintenance arch for the circular crane according to claim 1, characterized in that: The maintenance arch is arranged perpendicular to the main beam and installed on the brackets of the main beam of the bridge electrical room and the main beam of the non-electrical room.

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