阅读说明：本技术 防水防爆大型锅炉炉膛检修升降平台 (Waterproof and explosion-proof large boiler furnace maintenance lifting platform ) 是由 马凤埠 潘晓琳 薛国波 张国连 刘春伟 于 2021-09-22 设计创作，主要内容包括：本发明提供了一种防水防爆大型锅炉炉膛检修升降平台,涉及锅炉检修技术领域,该检修升降平台包括由不锈钢材质制成的安装框架,安装框架包括横梁和滑动臂,横梁和滑动臂交叉装配式连接,滑动臂之间和/或横梁之间铺设支撑板,安装框架上设有提升机构,提升机构通过置于炉膛顶部的牵引绳上下牵引安装框架。本发明根据需要确定安装框架的高度,避免了检修人员检查、测量时不停的爬上爬下,减少检修人员的劳动强度,提高检修效率,同时横梁和滑动臂采用装配式连接方式,克服了搭拆钢管架耗费时间长和成本高的缺陷。(The invention provides a waterproof and explosion-proof large boiler furnace maintenance lifting platform, which relates to the technical field of boiler maintenance. The height of the installation frame is determined according to the requirement, continuous climbing up and down during inspection and measurement of maintainers is avoided, the labor intensity of the maintainers is reduced, the overhauling efficiency is improved, and meanwhile, the defects of long time consumption and high cost in assembling and disassembling the steel pipe frame are overcome due to the fact that the cross beam and the sliding arm are in an assembly type connection mode.)

1. The utility model provides a waterproof explosion-proof large-scale boiler furnace overhauls lift platform, its characterized in that includes the installation frame of being made by stainless steel material, the installation frame includes crossbeam and sliding arm, the crossbeam with the sliding arm is cross-assembly type to be connected, between the sliding arm and/or lay the backup pad between the crossbeam, be equipped with hoist mechanism on the installation frame, hoist mechanism pulls from top to bottom through the haulage rope of arranging the furnace top in the installation frame.

2. The waterproof and explosion-proof large boiler furnace overhaul lifting platform of claim 1, wherein the cross beam comprises a front cross beam, a middle cross beam and a rear cross beam which are arranged in the same direction, the middle cross beam is arranged between the front cross beam and the rear cross beam, a front connecting beam is arranged between the front cross beam and the middle cross beam, and a rear connecting beam is arranged between the rear cross beam and the middle cross beam.

3. The waterproof and explosion-proof large boiler furnace overhaul lifting platform according to claim 2, wherein the sliding arms include a front free sliding arm and a rear free sliding arm, the front free sliding arm is disposed at one side of the front girder and is arranged along the extending direction of the front connecting beam, and the rear free sliding arm is disposed at one side of the rear girder and is arranged along the extending direction of the rear connecting beam.

4. The waterproof and explosion-proof large boiler furnace overhaul lifting platform of claim 3, wherein the front girder and the rear girder are both provided with a limiting member, the front free sliding arm is rotatably connected with the front girder, and the rear free sliding arm is rotatably connected with the rear girder.

5. The waterproof and explosion-proof large boiler furnace overhaul lifting platform of claim 3, wherein a front tie rod frame is arranged above the front girder, a rear tie rod frame is arranged above the rear girder, a front tie rod frame connecting beam and a rear tie rod frame connecting beam are arranged between the front tie rod frame and the rear tie rod frame, a front balance tie rod is obliquely arranged between the front tie rod frame and the front free sliding arm, and a rear balance tie rod is obliquely arranged between the rear tie rod frame and the rear free sliding arm.

6. A water and explosion proof large boiler furnace overhaul lifting platform according to claim 3, wherein the side of the front free sliding arm away from the front girder is provided with a roller, and the side of the rear free sliding arm away from the rear girder is provided with a roller.

7. The waterproof and explosion-proof large boiler furnace overhaul lifting platform of claim 3, wherein the free end of the front free sliding arm away from the front girder is provided with a free guide climbing stabilizing device, and the free end of the rear free sliding arm away from the rear girder is provided with a free guide climbing stabilizing device.

8. The waterproof and explosion-proof large boiler furnace overhaul lifting platform of claim 3, wherein the front free sliding arm and the rear free sliding arm are both arranged in an inverted triangle structure, a reinforcing support is arranged inside the inverted triangle structure, the section of one side close to the front girder and the rear girder is large, and the section of one side far away from the front girder and the rear girder is small.

9. The waterproof and explosion-proof large-scale boiler furnace maintenance lifting platform according to any one of claims 1 to 8, wherein a guardrail is arranged on the periphery of the mounting frame.

10. The waterproof and explosion-proof large-scale boiler furnace maintenance lifting platform according to any one of claims 1 to 8, wherein a lifting machine base is arranged on the mounting frame, the lifting mechanism is installed in the lifting machine base, and a safety lock and a height stroke limiter are arranged above the lifting machine base.

Technical Field

The invention relates to the technical field of boiler maintenance, in particular to a waterproof and explosion-proof lifting platform for large boiler hearth maintenance.

Background

Because the heating surfaces of a water-cooled wall, a water-cooled screen, a superheater, a burner and the like in the boiler have errors in the design, manufacture and installation processes and are in a very severe working environment in the running process of a boiler hearth, the boiler is required to work under the conditions of high temperature, high pressure and high load, and is also required to be subjected to the tests of oxidation and vulcanization and the washing and abrasion of dust in flue gas, and the boiler tube is further required to burst due to the fact that the wall thickness is thinned and the mechanical property is reduced in the long term. Meanwhile, according to the twenty-eighth regulation of Special equipment safety supervision regulations of State Council: the utility boiler needs to be checked regularly. So that the boiler inevitably needs to be subjected to rush repair, minor repair, intermediate repair or major repair in the operation process. A waterproof and explosion-proof large boiler furnace maintenance lifting platform is safe, efficient and multipurpose maintenance construction operation equipment in a boiler furnace.

When the thermal power plant overhauls boiler furnace, overhaul lift platform and bear the lift platform that transports material and maintenance work personnel reciprocal operation from top to bottom, blow out and get into the inside inspection of furnace and overhaul the mode that the personnel set up the steel-pipe frame mostly.

The steel pipe frame is not only long in time consumption, but also various unsafe factors such as high falling, heavy object smashing and the like exist when the steel pipe frame is erected and dismantled. Particularly, the maintainers need to climb up and down ceaselessly during examination and measurement, so that the labor intensity is increased invisibly, the overhauling efficiency is low, and a plurality of unsafe factors such as high falling, heavy object smashing and the like also exist.

The inspection and the maintenance of the furnace are carried out by taking a 480t/h boiler as an example and adopting a rack building mode, wherein the time for completing the building of 15 persons is about 96 hours, the time for removing the rack is about 72 hours, and the total time is about 168 hours. The erected shelf pipes and shelf boards are rented on the market basically, if the shelf pipes and the shelf boards are damaged in the using process, the rental companies pay for the damage according to the market price, and even the shelf pipes and the shelf boards which are arranged by the companies are also damaged in the using process, the requirements for the damage are continuously increased.

In sum, the cost of the scaffold rolled once is about 15 ten thousand yuan.

Disclosure of Invention

In view of the above, the invention aims to provide a waterproof and explosion-proof lifting platform for overhauling a large boiler furnace, which is used for solving the technical problems that in the prior art, a steel pipe frame is erected for overhauling the boiler furnace, the time and the cost for erecting and disassembling the steel pipe frame are long, various unsafe factors such as falling from a high place, damage caused by heavy objects and the like exist when the frame is erected and disassembled, and particularly, overhauling personnel need to climb up and down continuously during inspection and measurement, so that the labor intensity is increased invisibly, and the overhauling efficiency is low.

In order to achieve the purpose, the invention provides a waterproof and explosion-proof large boiler furnace maintenance lifting platform which comprises an installation frame made of stainless steel materials, wherein the installation frame comprises a cross beam and sliding arms, the cross beam is in cross assembly connection with the sliding arms, supporting plates are laid between the sliding arms and/or between the cross beams, a lifting mechanism is arranged on the installation frame, and the lifting mechanism pulls the installation frame up and down through a traction rope arranged at the top of a furnace.

According to a preferred embodiment, the cross beam comprises a front girder, a middle girder and a rear girder which are arranged in the same direction, the middle girder is arranged between the front girder and the rear girder, a front connecting beam is arranged between the front girder and the middle girder, and a rear connecting beam is arranged between the rear girder and the middle girder.

According to a preferred embodiment, the sliding arm includes a front free sliding arm and a rear free sliding arm, the front free sliding arm is disposed on one side of the front girder and is disposed along an extending direction of the front connection beam, and the rear free sliding arm is disposed on one side of the rear girder and is disposed along an extending direction of the rear connection beam.

According to a preferred embodiment, the front girder and the rear girder are both provided with a limiting member, the front free sliding arm is rotatably connected with the front girder, and the rear free sliding arm is rotatably connected with the rear girder.

According to a preferred embodiment, a front pull rod frame is arranged above the front girder, a rear pull rod frame is arranged above the rear girder, a front pull rod frame connecting beam and a rear pull rod frame connecting beam are arranged between the front pull rod frame and the rear pull rod frame, a front balance pull rod is obliquely arranged between the front pull rod frame and the front free sliding arm, and a rear balance pull rod is obliquely arranged between the rear pull rod frame and the rear free sliding arm.

According to a preferred embodiment, the front free-sliding arm is provided with a roller on the side remote from the front girder, and the rear free-sliding arm is provided with a roller on the side remote from the rear girder.

According to a preferred embodiment, the free end of the front free sliding arm, which is far away from the front girder, is provided with a free guide climbing stabilizing device, and the free end of the rear free sliding arm, which is far away from the rear girder, is provided with a free guide climbing stabilizing device.

According to a preferred embodiment, the front free sliding arm and the rear free sliding arm are both in an inverted triangle structure, a reinforcing support is arranged inside the front free sliding arm and the rear free sliding arm, the cross section of one side close to the front girder and the rear girder is large, and the cross section of one side far away from the front girder and the rear girder is small.

According to a preferred embodiment, the mounting frame is provided with a guard rail at its periphery.

According to a preferred embodiment, a lifting machine base is arranged on the mounting frame, the lifting mechanism is mounted on the lifting machine base, and a safety lock and a height stroke limiter are arranged above the lifting machine base.

The waterproof and explosion-proof large boiler furnace maintenance lifting platform provided by the invention has the following technical effects:

this kind of waterproof explosion-proof large-scale boiler furnace overhauls lift platform, mainly constitute by the installation frame, the material of installation frame is the stainless steel, it includes crossbeam and sliding arm, crossbeam and sliding arm cross assembly formula are connected, lay the backup pad between the sliding arm and/or between the crossbeam, the backup pad can support maintainer and maintenance material, be equipped with hoist mechanism on the installation frame, hoist mechanism pulls the installation frame from top to bottom through the haulage rope of arranging the furnace top in, thereby confirm the height of installation frame as required, the inspection of maintainer has been avoided, climb up and down incessantly during the measurement, reduce maintainer's intensity of labour, improve maintenance efficiency, crossbeam and sliding arm adopt the assembled connected mode simultaneously, overcome and taken the long and with high costs defect of steel pipe support consumption time of tearing open.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a front view of a lifting platform for overhauling a hearth of a large waterproof and explosion-proof boiler according to an embodiment of the invention;

FIG. 2 is a top view of the hearth maintenance lifting platform of the waterproof and explosion-proof large boiler in FIG. 1;

FIG. 3 is a sectional view of the hearth maintenance lifting platform of the waterproof and explosion-proof large-sized boiler in FIG. 2 along the direction A-A;

FIG. 4 is a left side view of the hearth overhaul lifting platform of the waterproof and explosion-proof large-scale boiler in FIG. 1;

FIG. 5 is a diagram of the service state of the waterproof and explosion-proof large boiler furnace maintenance lifting platform in the boiler furnace in FIG. 1;

FIG. 6 is a left side view of the lifting platform for overhauling the hearth of the waterproof and explosion-proof large boiler in FIG. 4 with the guardrail removed;

FIG. 7 is a schematic view of the front and rear free sliding arms of the hearth maintenance lifting platform of the waterproof and explosion-proof large boiler in FIG. 1;

FIG. 8 is a schematic view of a front girder of a hearth overhaul lifting platform of the waterproof and explosion-proof large-sized boiler in FIG. 1;

FIG. 9 is a schematic view of a middle girder of a hearth overhaul lifting platform of the waterproof and explosion-proof large-scale boiler in FIG. 1;

FIG. 10 is a schematic diagram of a rear girder of a hearth overhaul lifting platform of the waterproof and explosion-proof large-sized boiler in FIG. 1;

FIG. 11 is a schematic view of the front and rear balance pull rods of the hearth maintenance lifting platform of the waterproof and explosion-proof large-scale boiler in FIG. 1;

FIG. 12 is a schematic view of the guardrail of the hearth overhaul lifting platform of the waterproof and explosion-proof large-scale boiler in FIG. 1;

FIG. 13 is a schematic view of the front and rear tie rod frames of the hearth servicing and lifting platform of the waterproof and explosion-proof large boiler of FIG. 1;

FIG. 14 is a schematic view of the front and rear connecting beams of the waterproof and explosion-proof large boiler furnace maintenance lifting platform in FIG. 1;

FIG. 15 is a schematic view of a connecting beam of front and rear pull rod frames of the lifting platform for overhauling the hearth of the waterproof and explosion-proof large boiler in FIG. 1;

FIG. 16 is a schematic view of a supporting plate of a hearth maintenance lifting platform of the waterproof and explosion-proof large-scale boiler in FIG. 1;

FIG. 17 is a schematic view of a lifter base of the hearth maintenance lifting platform of the waterproof and explosion-proof large boiler in FIG. 1;

FIG. 18 is a schematic view of a connecting support of a hearth overhaul lifting platform of the waterproof and explosion-proof large-scale boiler in FIG. 1;

fig. 19 is a schematic view of a free-guide climbing stabilizing device of a hearth overhaul lifting platform of the waterproof and explosion-proof large-scale boiler in fig. 1.

Wherein fig. 1-fig. 19:

10. a roller; 11. a front free sliding arm; 12. a rear free sliding arm; 13. connecting a support; 14. a free introduction climbing stabilizing device;

20. a V-shaped limiting plate; 21. a front girder; 22. a middle girder; 23. a rear girder; 24. a front connecting beam; 25. a rear connecting beam;

3. a lifting mechanism; 4. a grid walking board;

51. a front tension rod frame; 52. a rear draw bar frame; 53. the front pull rod frame and the rear pull rod frame are connected with the beam; 54. a front balancing pull rod; 55. a rear balancing pull rod;

6. folding the guard bar;

7. lifting the machine base; 71. a safety lock; 72. a height travel limiter;

8. stainless steel electrical apparatus case.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

As described in the background art, in the prior art, the way of erecting the steel pipe frame by personnel is adopted, so that the time for erecting and disassembling the steel pipe frame is long, and various unsafe factors such as high falling, heavy object smashing and the like exist when the frame is erected and disassembled. Particularly, the maintainers need to climb up and down ceaselessly during examination and measurement, so that the labor intensity is increased invisibly, the overhauling efficiency is low, and a plurality of unsafe factors such as high falling, heavy object smashing and the like also exist.

Based on the above, the invention provides a waterproof and explosion-proof large boiler furnace maintenance lifting platform, which mainly comprises an installation frame, wherein the installation frame is made of stainless steel and comprises a cross beam and sliding arms, the cross beam is in cross assembly connection with the sliding arms, supporting plates are laid between the sliding arms and/or between the cross beams and can support maintenance personnel and maintenance materials, a lifting mechanism is arranged on the installation frame and pulls the installation frame up and down through a traction rope arranged at the top of a furnace, so that the height of the installation frame is determined as required, the maintenance personnel is prevented from continuously climbing up and down during inspection and measurement, the labor intensity of the maintenance personnel is reduced, the maintenance efficiency is improved, and meanwhile, the cross beam and the sliding arms adopt an assembly connection mode, so that the defects of long time consumption and high cost in steel pipe frame erection and disassembly are overcome.

The technical solution of the present invention will be described in detail with reference to the specific accompanying drawings 1-19.

The invention drills 8-16 holes with the diameter of 16 at the top of a boiler furnace, and a traction rope (a stress rope and a safety rope in the invention) is penetrated to the bottom of the furnace. Designed according to the structural form of the boiler, the stress rope and the safety rope are fixed on a roof plate beam or a rigid beam on the upper part of the boiler.

The stress rope and the safety rope are arranged at the top of the hearth, both adopt phi 11 galvanized steel wire ropes, are fixed on a steel structure at the top of the hearth by using phi 12 steel wire rope clamps, and the lower part of the whole rope is provided with a rope drop to prevent the stress rope from knotting with the safety rope.

And parts for overhauling the lifting platform are sent into the hearth from a manhole door at the position of the lower slope wall of the water-cooled wall for assembly. The bearing steel wire rope enters the hearth through a phi 16 hole drilled on the top of the furnace and is connected with a lifting mechanism 3 on the maintenance lifting platform in the furnace, and the maintenance lifting platform is driven by the lifting mechanism 3 to freely rise and fall in the hearth, so that the maintenance is realized to all corners in the hearth.

As shown in fig. 1-5, various angle configurations for servicing the lift platform include a mounting frame made of stainless steel, preferably 304 stainless steel, which is corrosion resistant and has high strength and rigidity.

The installation frame includes crossbeam and slide arm, and crossbeam and slide arm cross assembly formula are connected, lay the backup pad between the slide arm and/or between the crossbeam, are equipped with hoist mechanism 3 on the installation frame, and hoist mechanism 3 pulls the installation frame from top to bottom through arranging the haulage rope at furnace top in.

The supporting plate is preferably a grid walking board 4, and the structure is shown in fig. 16. The mesh walking board stretcher plate 4 is fully paved with a waterproof explosion-proof large boiler furnace maintenance lifting platform, the mesh walking board stretcher plate 4 is arranged on the upper sides of the front free sliding arm 11, the rear free sliding arm 12, the front connecting beam 24, the rear connecting beam 25, the front girder 21, the middle girder 22 and the rear girder 23, the material is 304 stainless steel, and all the mesh walking board stretcher plates 4 can be taken into the inside of the furnace at a manhole with the diameter phi of 450 mm.

In addition, the lifting mechanism 3 is preferably a waterproof and explosion-proof 1.5T lifting mechanism 3, 4-8 sets of lifting mechanisms 3 (combined according to the size and the load of a hearth) are arranged on the maintenance lifting platform, the rated load of each lifting mechanism 3 is 1.5T, the rated lifting speed is 8m/min, a 3KW waterproof, explosion-proof and dust-proof aluminum shell motor is arranged, and the protection grade is IP66 grade. The motor is provided with a manual descending device, when power failure or line fault cannot be eliminated, the platform can slide downwards by using the self weight of the platform by using the manual descending device of the motor, and the platform slides downwards in a balanced way in the sliding process.

Specifically, as shown in fig. 2, the cross beam includes a front girder 21, a middle girder 22 and a rear girder 23 which are arranged in the same direction, the front girder 21, the middle girder 22 and the rear girder 23 have the same length and are parallel to each other, the middle girder 22 is located between the front girder 21 and the rear girder 23, a front connection beam 24 is provided between the front girder 21 and the middle girder 22, a rear connection beam 25 is provided between the rear girder 23 and the middle girder 22, the number of the front connection beam 24 and the number of the rear connection beam 25 are the same, and the cross beam mainly functions to connect the front girder 21, the middle girder 22 and the rear girder 23 together on the same straight line.

It should be noted that the number and length of the front connecting beams 24 and the rear connecting beams 25 are not limited in the present invention, and it is within the protection scope of the present invention as long as the purpose of connecting the front girders 21, the middle girders 22 and the rear girders 23 together can be achieved.

As shown in fig. 14, the front and rear connection beams 24 and 25 are of an inverted triangular structure.

As shown in fig. 8, for the structure of the front girder 21, about 4-6 front girders 21 are needed for each waterproof and explosion-proof large boiler furnace overhaul lifting platform, but the specific number depends on the specific practical use situation, and the invention is not limited thereto. The front girder 21 is integrally in a regular triangle structure form, the whole sections are the same, the connecting parts are connected through a twisted shaft, a three-point integral connection is adopted, and the material is 304 stainless steel.

As shown in fig. 9, for the structure of the middle girders 22, 5-8 middle girders 22 are needed for each waterproof and explosion-proof large boiler furnace overhaul lifting platform, but the specific number depends on the specific practical use situation, and the invention is not limited to this. The middle girder 22 is integrally in an inverted triangle framework form, the cross sections of the two ends are small, the middle girder can be conveniently located at the same height with the front connecting beam 24 and the rear connecting beam 25, the grid walking board supporting plate 4 is conveniently installed, the connecting parts are connected through hinged shafts and are integrally connected through three points, and the middle girder is made of 304 stainless steel.

As shown in fig. 10, for the structure of the rear girders 23, about 4-6 rear girders 23 are needed for each waterproof and explosion-proof large boiler furnace overhaul lifting platform, but the specific number depends on the specific practical use situation, and the invention is not limited thereto. The rear girder 23 is integrally in the form of a regular triangle structure, and the overall section is the same. The connecting part of the rear girder 23 is connected by a twisted shaft, and is integrally connected by a three-point type, and the material is 304 stainless steel.

More specifically, as shown in fig. 5, the slide arm includes a front free slide arm 11 and a rear free slide arm 12, the front free slide arm 11 being provided on one side of the front girder 21 and being disposed along the extending direction of the front connecting beam 24, and the rear free slide arm 12 being provided on one side of the rear girder 23 and being disposed along the extending direction of the rear connecting beam 25.

The overhauling lifting platform comprises 8-20 front free sliding arms 11 and 8-20 rear free sliding arms 12, the structures of the front free sliding arms 11 and the rear free sliding arms 12 are shown in figure 7, the front ends of the front free sliding arms 11 and the rear free sliding arms 12 are provided with 8-inch rollers 10, the rollers 10 are preferably impact-resistant rubber rollers 10, as shown in figure 5, when the overhauling lifting platform is placed in a conical cavity of a boiler hearth, the horizontal direction of the front free sliding arms 11 and the rear free sliding arms 12 is changed into the inclined direction to adapt to the conical cavity of the boiler hearth, and at the moment, the rollers 10 can freely slide up and down on the conical surface of the boiler hearth.

The otic placode has been welded to the upper end of preceding free sliding arm 11 and back free sliding arm 12, connects through the hank system axle, and the rear end welding has the reinforcement cover, and overall structure is that the front end cross-section is little, and the big inverted triangle structural style in root cross-section, according to lever principle, the lifting force of hoist mechanism 3 can be saved to this kind of structure, and the root of preceding free sliding arm 11 and back free sliding arm 12 has welded the reinforcement and has propped the enhancement, and the material is 304 stainless steel.

Furthermore, the front girder 21 and the rear girder 23 are both provided with a limiting part, the limiting part is preferably a V-shaped limiting plate 20, the front girder 21 is welded with the V-shaped limiting plate 20, when the front free sliding arm 11 and the rear free sliding arm 12 freely slide up and down, the front girder 21 slides to the upper part and then is positioned by the V-shaped limiting plate 20, the rear girder 23 is welded with the V-shaped limiting plate 20, when the front free sliding arm 11 and the rear free sliding arm 12 freely slide up and down, the rear girder 23 slides to the upper part and then is positioned by the V-shaped limiting plate 20, the front free sliding arm 11 is rotatably connected with the front girder 21, and the rear free sliding arm 12 is rotatably connected with the rear girder 23.

Further, a front pull rod frame 51 is arranged above the front girder 21, a rear pull rod frame 52 is arranged above the rear girder 23, as shown in fig. 13, the front pull rod frame 51 and the rear pull rod frame 52 are connected with a front balance pull rod 54 and a rear balance pull rod 55, the lower ends of the front pull rod frame and the rear pull rod frame are connected with a rear connecting beam 25 of the front connecting beam 24, the connecting parts are all connected through a twisted shaft, the parts connected with the twisted shaft are all reinforced by reinforcing sleeves, and the materials are 304 stainless steel.

As shown in fig. 15, a front-rear tie bar frame connecting beam 53 is provided between the front tie bar frame 51 and the rear tie bar frame 52, the stainless steel electric box 8 is mounted on the front-rear tie bar frame connecting beam 53, a front balance tie bar 54 is provided between the front tie bar frame 51 and the front free-sliding arm 11 in an inclined manner, and a rear balance tie bar 55 is provided between the rear tie bar frame 52 and the rear free-sliding arm 12 in an inclined manner.

As shown in fig. 11, which is a schematic structural view of the front balance pull rod 54 and the rear balance pull rod 55, one end of the front balance pull rod 54 and one end of the rear balance pull rod 55 are a double lug plate and the other end thereof is a single lug plate, and the connection parts are connected by a twisted shaft. One end of each of the front balance pull rod 54 and the rear balance pull rod 55 is fixed on the front free sliding arm 11 or the rear free sliding arm 12, and the other end is fixed on the front pull rod frame 51 or the rear pull rod frame 52, and the front balance pull rod and the rear balance pull rod are made of 304 stainless steel.

As shown in fig. 12, for the guardrail structure, the guardrail is preferably a folding guardrail 6 for the periphery and the hanging screen, the folding guardrail 6 is composed of a vertical rod guardrail and upper and lower folding guardrails 6, the vertical rod guardrail can be detached independently, the upper and lower folding guardrails 6 are welded together by reinforcing sleeves, the upper folding guardrail 6 is sleeved on the vertical rod guardrail, and the lower folding guardrail 6 is connected with the vertical rod guardrail by an R-shaped cotter pin. The upright stanchion guardrail is fixed around the platform and assembled by sleeving and inserting, and is tightly supported by jackscrews, and the upright stanchion guardrail is made of 304 stainless steel.

As shown in fig. 6 and 17, the lifting frame 7 is provided, the lifting frame 7 is connected with the front girder 21 and the rear girder 23 by a twisted shaft, holes of the lifting frame 7 are reinforced by reinforcing sleeves and connected with the lifting mechanism 3 by bolts and the twisted shaft, and the material is 304 stainless steel.

As shown in fig. 18, the connecting brace 13 is a connecting brace 13 of the free sliding arm, and the connecting brace 13 is connected with the front free sliding arm 11 and the rear free sliding arm 12 by bolts, so that the free sliding arms are connected into a whole, and the connecting brace is firm and reliable. The material is 304 stainless steel.

Further, a free-guide climbing stabilizing device 14 is arranged at the free end of the front free sliding arm 11 far away from the front girder 21, a free-guide climbing stabilizing device 14 is arranged at the free end of the rear free sliding arm 12 far away from the rear girder 23, and the free-guide climbing stabilizing device 14 plays a role in climbing and stabilizing when the front free sliding arm 11 and the rear free sliding arm 12 slide up and down, as shown in fig. 19.

As shown in fig. 1, a safety lock 71 and a height stroke stopper 72 are provided above the lift base 7.

The safety lock 71 plays a role in preventing inclination and rope breakage, is arranged above the lifting machine base 7, penetrates the stress rope from top to bottom, passes through a fulcrum wheel of the safety lock 71, is introduced into the lifting mechanism 3, and outputs at the lower part of the lifting mechanism 3.

When the force-bearing rope is stressed, the safety rope penetrates into the safety lock 71 from the upper end of the safety lock 71 and is output at the lower end. When the maintenance lifting platform inclines by 5-10 degrees left and right and front and back, the fulcrum wheel is immediately reset to hold the safety rope, and the lifting platform cannot ascend and descend at the moment and can only adjust balance by a single machine.

After all the lifting mechanisms 3 are balanced, the safety locks 71 release the safety lines. When the stressed rope is broken, the safety lock 71 instantly holds the safety rope after the fulcrum wheel is not stressed, and the falling accident of the maintenance lifting platform is prevented. After the wire rope is broken, a worker outside the furnace draws out the broken wire rope and replaces the broken wire rope with a new wire rope, and safety rope protection is provided when the new wire rope is replaced.

The height stroke limiter 72 has waterproof and explosion-proof functions, the waterproof, dustproof and explosion-proof grade is IP66, the height stroke limiter is installed above the side face of the safety lock 71, a circuit is connected to lift the V-shaped limiting plate 20 to the position above a hearth to be required, the V-shaped limiting plate 20 is fixed on a stress rope, when the height stroke limiter 72 is in contact with the V-shaped limiting plate 20 on the stress rope above the safety lock 71 during ascending, the plurality of lifting mechanisms 3 are connected in series at the moment, the circuits are stopped simultaneously, an alarm signal is sent out immediately, the maintenance platform can only descend but cannot ascend, and unsafe accidents caused by the fact that the maintenance lifting platform rushes to top are prevented.

Stainless steel electrical apparatus case 8 adopts safe voltage 36V, and each hoist mechanism 3 adopts quick-operation joint and electrical apparatus case socket to link to each other, and dustproof waterproof explosion-proof processing is all adopted to plug department, and waterproof dustproof explosion-proof grade is IP 66. The main power supply adopts a 380V three-phase five-wire system, one end of the main power supply is connected with a main power supply, the other end of the main power supply adopts an aviation quick butt joint plug to be in butt joint with an electrical box, the electrical box is provided with protection devices such as overheating, short circuit and electric leakage, and is also provided with a remote control ascending and descending control button. Lifting and descending lifting alarm bells are also arranged. The maintenance platform is convenient for personnel to maintain the waterproof and explosion-proof illuminating lamp with the upper 36V arranged at each corner.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.