A dust-proof system and method for the pit of a hydro-generating unit

Abstract

A dust-proof system and method for the pit of a hydro-generating unit, including an annular skeleton and a dust-proof cover. The annular skeleton is used to be installed at the upper end of the annular foundation pit of the hydro-generating unit. The annular dust-proof cover is installed above the annular skeleton. The dust-proof cover is composed of several fan-shaped units. Each fan-shaped unit includes an outer-circle dust-proof cover, a top dust-proof cover and an inner-circle dust-proof cover. The top dust-proof cover includes a fixed dust-proof plate and a movable dust-proof plate. The fixed dust-proof plate is fixedly installed with the annular skeleton. The movable dust-proof plate is installed above the fixed dust-proof plate in a radial sliding manner. The movable dust-proof plate is located on one side of the center of the annular foundation pit. The outer-circle dust-proof cover is installed and connected with the fixed dust-proof plate. The inner-circle dust-proof cover is installed and connected with the movable dust-proof plate. The inner-circle dust-proof cover can be opened and closed. Through the above structure, the dust-proof cover can completely enclose the annular foundation pit in the construction area of the stator winding of the hydro-generating unit, and can provide a material hoisting space when materials need to be hoisted in the annular foundation pit.

Description

Technical Field

[0001] The present invention relates to the technical field of the installation of hydroelectric generator sets, and particularly relates to a dust-proof system and method for the pit of a hydroelectric generator set. Background Art

[0002] During the installation or transformation of the stator windings of a hydroelectric generator set, a large amount of smoke and dust will be generated, which will cause great harm to construction workers and equipment (adjacent equipment and its own equipment). At present, the protective treatment method for the smoke and dust generated in the pit of a hydroelectric generator set is to set up a protective isolation belt around the pit of the hydroelectric generator set to limit the smoke and dust within the pit of the hydroelectric generator as much as possible. This method can limit the impact of smoke and dust on adjacent equipment to a limited extent, but it does not reduce the harm to on-site construction workers and its own equipment at all. At the same time, during the installation stage of the stator windings, the process requirement is a dust-free environment. At present, the smoke and dust-proof measures in the pit of a hydroelectric generator set obviously cannot meet the construction process requirements. Therefore, it is necessary to design a dust-proof system for the pit of a hydroelectric generator set, which can reduce the harm to the human body and equipment caused by smoke and dust emissions during the operation while meeting the requirements of on-site construction standardization. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to solve the problems existing in the above background art, and provide a dust-proof system for the pit of a hydroelectric generator set, so as to provide a clean environment for the installation or transformation of the stator windings of a hydroelectric generator set, and reduce the harm caused by smoke and dust to the human body and equipment.

[0004] Another technical problem to be solved by the present invention is: to provide an installation and use method for the above-mentioned dust-proof system for the pit of a hydroelectric generator set, which can achieve closed dust-proof and facilitate the hoisting of materials.

[0005] In order to achieve the above technical features, the object of the present invention is realized as follows: A dust-proof system for the pit of a hydroelectric generator set includes an annular skeleton and a dust-proof cover. The annular skeleton is used to be installed at the upper end of the annular foundation pit of the hydroelectric generator set, and the annular dust-proof cover is installed above the annular skeleton. The dust-proof cover is composed of a plurality of fan-shaped units. Each fan-shaped unit includes an outer circle dust-proof cover, a top dust-proof cover, and an inner circle dust-proof cover. The top dust-proof cover includes a fixed dust-proof plate and a movable dust-proof plate. The fixed dust-proof plate is fixedly installed with the annular skeleton, and the movable dust-proof plate is installed above the fixed dust-proof plate in a radial sliding manner. The movable dust-proof plate is located on one side of the center of the annular foundation pit. The outer circle dust-proof cover is installed and connected with the fixed dust-proof plate, and the inner circle dust-proof cover is installed and connected with the movable dust-proof plate. The inner circle dust-proof cover can be opened and closed.

[0006] The annular skeleton includes a number of radial brackets, and the adjacent radial brackets are connected into a ring by outer circular cross bars. The radial brackets include outer circular columns, inner circular columns and radial cross bars. The two ends of the radial cross bars are respectively installed at the upper ends of the outer circular columns and the inner circular columns. One end of the radial diagonal bar is connected to the lower end of the outer circular column, and the other end is connected to the radial cross bar. The inner circular columns between adjacent radial brackets are connected by inner circular diagonal bars. One end of the support diagonal bar is connected to the inner circular diagonal bar, and the other end is connected to the adjacent inner circular column. Installation parts for connecting with the annular foundation pit are provided at the bottoms of the outer circular columns and the inner circular columns.

[0007] The fixed dust-proof plate includes a fixed skeleton, a first dust-proof structure is installed on the upper side of the fixed skeleton, and a connecting fastener for connecting and installing with the annular skeleton is installed on the lower side of the fixed skeleton; the movable dust-proof plate includes a movable skeleton, a second dust-proof structure is installed on the upper side of the movable skeleton, an extended skeleton is provided on the side of the movable skeleton close to the fixed dust-proof plate, two slide rails are installed radially and parallelly on the top of the fixed dust-proof plate, a slider matched with the slide rails is installed on the lower side of the extended skeleton, and the slider is in sliding fit with the slide rails.

[0008] The first dust-proof structure and the second dust-proof structure are tarpaulins or thin films or metal plates.

[0009] The movable dust-proof plate is driven by a driving structure to slide on the fixed dust-proof plate; a lead screw is also installed on the top of the fixed dust-proof plate between the two slide rails. Bearing seats are respectively installed at the two ends of the lead screw, and the bearing seats are fixedly installed with the fixed dust-proof plate. The cross beam at the front end of the extended skeleton is located between the two bearing seats, and a lead screw nut is also installed on the cross beam at the front end of the extended skeleton. The lead screw nut is screwed with the lead screw, and the lead screw extends out of the bearing seat on the side away from the movable dust-proof plate to form a driving end.

[0010] The inner circular dust-proof cover is a flexible sealing structure.

[0011] The inner circular dust-proof cover can be retracted and extended; the upper end of the inner circular dust-proof cover is installed at the end of the movable dust-proof plate. A plurality of wire passing holes are longitudinally provided on the inner circular dust-proof cover. A pulley is installed at the end of the inner circular dust-proof cover. One end of the pull wire is located on one side of the fixed dust-proof plate, and the other end bypasses the pulley and then passes through the wire passing holes in sequence in an inner-outer cross manner and is connected to the bottom of the inner circular dust-proof cover.

[0012] A lifting ring is also installed on the fixed dust-proof plate.

[0013] It further includes a dust absorption system, and the dust absorption system includes an air suction fan and a dust filter. The air suction fan is communicated with the dust-proof cover through an air suction pipe, and the air suction fan is communicated with the dust filter through an exhaust pipe.

[0014] A dust-proof method using the water turbine generator pit dust-proof system described above includes the following steps:

[0015] S1. Install the annular skeleton;

[0016] S2. Install the dust cover; install the movable dust plate on the fixed dust plate, then install the upper end of the outer circular dust cover on the outside of the fixed dust plate, and install the upper end of the inner circular dust cover on the inside of the movable dust plate;

[0017] S3. Lift the dust cover onto the annular skeleton in sequence by means of a lifting tool, and connect and fix the fixed dust plate to the annular skeleton;

[0018] S4. When operating in the annular foundation pit, drive the lead screw to rotate by rotating the driving end, extend the movable dust plate, and at the same time, both the outer circular dust cover and the inner circular dust cover are in the unfolded state. The dust cover completely encloses the annular foundation pit of the construction area of the stator winding of the water turbine generator set, and turn on the dust absorption system to suck dust;

[0019] S5. When materials need to be lifted in the annular foundation pit, retract the movable dust plates of one or more fan-shaped units and retract the inner circular dust cover to provide a space for material hoisting; wherein, reverse-rotate the driving end to drive the lead screw to rotate, completely retract the movable dust plate, and at the same time, pull the traction wire on one side of the fixed dust plate to retract and open the inner circular dust cover upward.

[0020] The present invention has the following beneficial effects:

[0021] 1. The dust cover can completely enclose the annular foundation pit of the construction area of the stator winding of the water turbine generator set, provide a clean environment for the installation or transformation of the stator winding of the water turbine generator set, and reduce the harm caused by smoke and dust to the personnel and equipment. When materials need to be lifted in the annular foundation pit, retract the movable dust plates of one or more fan-shaped units and retract the inner circular dust cover, and it can also provide a space for material hoisting.

[0022] 2. The movable dust plate slides on the fixed dust plate through the driving structure, and by using a handle or a power tool to rotate the driving end, the movable dust plate can be conveniently opened.

[0023] 3. The inner circular dust cover is a flexible sealing structure, and by pulling and releasing the pull wire, the inner circular dust cover can be lifted, folded, retracted, opened, unfolded and closed. Description of the Drawings

[0024] Figure 1 It is a front view structural schematic diagram of the present invention.

[0025] Figure 2 It is a three-dimensional structural schematic diagram of the present invention.

[0026] Figure 3 It is a three-dimensional structural schematic diagram of the annular skeleton of the present invention.

[0027] Figure 4 This is a three-dimensional structure schematic diagram of a single fan-shaped unit of the present invention.

[0028] Figure 5 is Figure 4 the enlarged structure schematic diagram at position A in

[0029] Figure 6 This is a three-dimensional structure schematic diagram of the bottom of a single fan-shaped unit of the present invention.

[0030] Figure 7 This is a three-dimensional structure schematic diagram when the present invention is installed in an annular foundation pit.

[0031] Figure 8 This is a structure schematic diagram of the closed state of the present invention.

[0032] In the figure: annular foundation pit 100, annular skeleton 200, outer circular column 201, inner circular column 202, radial cross bar 203, outer circular cross bar 204, inner circular inclined bar 205, radial inclined bar 206, support inclined bar 207, mounting member 208;

[0033] Dust cover 300, outer circular dust cover 310, top dust cover 320, fixed dust plate 321, fixed skeleton 3211, first dust-proof structure 3212, connecting fastener 3213, movable dust plate 322, movable skeleton 3221, second dust-proof structure 3222, protruding skeleton 3223, pulley 3224, slide rail 323, slider 324, pull wire 325, drive structure 326, lead screw 3261, bearing seat 3262, lead screw nut 3263, drive end 3264, inner circular dust cover 330, wire passing hole 331, lifting ring 327. Specific embodiments

[0034] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0035] Embodiment 1:

[0036] Refer to Figures 1-8, a dust-proof system for the pit of a hydro-generator set, comprising an annular skeleton 200 and a dust-proof cover 300. The annular skeleton 200 is used to be installed at the upper end of the annular foundation pit 100 of the hydro-generator set. The annular dust-proof cover 300 is installed above the annular skeleton 200. The dust-proof cover 300 is composed of several fan-shaped units. Each fan-shaped unit includes an outer-circle dust-proof cover 310, a top dust-proof cover 320, and an inner-circle dust-proof cover 330. The top dust-proof cover 320 includes a fixed dust-proof plate 321 and a movable dust-proof plate 322. The fixed dust-proof plate 321 is fixedly installed with the annular skeleton 200. The movable dust-proof plate 322 is installed above the fixed dust-proof plate 321 in a radial sliding manner. The movable dust-proof plate 322 is located on one side of the center of the annular foundation pit 100. The outer-circle dust-proof cover 310 is installed and connected with the fixed dust-proof plate 321. The inner-circle dust-proof cover 330 is installed and connected with the movable dust-proof plate 322. The inner-circle dust-proof cover 330 can be opened and closed. Through the above structure, the dust-proof cover 300 can completely enclose the annular foundation pit 100 in the construction area of the stator winding of the hydro-generator set, provide a clean environment for the installation or transformation of the stator winding of the hydro-generator set, and reduce the harm caused by smoke and dust to the personnel and equipment. When materials need to be hoisted in the annular foundation pit 100, the movable dust-proof plates 322 of one or more fan-shaped units are retracted, and the inner-circle dust-proof cover 330 is retracted, which can also provide a material hoisting space.

[0037] In a preferred solution, when the inner-circle dust-proof cover 330 is of a rigid structure, a flip-type opening and closing structure can be adopted. For example, the upper end of the inner-circle dust-proof cover 330 is hinged to the movable dust-proof plate 322. When the inner-circle dust-proof cover 330 is of a flexible structure, a rope-lifting and folding opening and closing structure can also be adopted.

[0038] See Figure 3 , the annular skeleton 200 includes several radial brackets. The adjacent radial brackets are connected into a ring by an outer-circle cross bar 204. The radial brackets include an outer-circle column 201, an inner-circle column 202, and a radial cross bar 203. The two ends of the radial cross bar 203 are respectively installed at the upper ends of the outer-circle column 201 and the inner-circle column 202. One end of a radial diagonal bar 206 is connected to the lower end of the outer-circle column 201, and the other end is connected to the radial cross bar 203. The inner-circle columns 202 between adjacent radial brackets are connected by an inner-circle diagonal bar 205. One end of a support diagonal bar 207 is connected to the inner-circle diagonal bar 205, and the other end is connected to the adjacent inner-circle column 202. Installation parts 208 for connecting with the annular foundation pit 100 are provided at the bottoms of the outer-circle column 201 and the inner-circle column 202. The structure is simple, and the annular skeleton is firmly and stably installed. Specifically, the installation part 208 includes an installation plate part for bolt installation and a magnetic suction seat.

[0039] See Figures 4-6, the fixed dust-proof plate 321 includes a fixed skeleton 3211. A first dust-proof structure 3212 is installed on the upper side of the fixed skeleton 3211, and a connecting fastener 3213 connected and installed with the annular skeleton 200 is installed on the lower side of the fixed skeleton 3211; the movable dust-proof plate 322 includes a movable skeleton 3221. A second dust-proof structure 3222 is installed on the upper side of the movable skeleton 3221. An extended skeleton 3223 is provided on the side of the movable skeleton 3221 close to the fixed dust-proof plate 321. Two slide rails 323 are installed radially and parallel to the top of the fixed dust-proof plate 321. A slider 324 matched with the slide rail 323 is installed on the lower side of the extended skeleton 3223, and the slider 324 is slidably matched with the slide rail 323. The movable skeleton 3221 slides on the slide rail 323 through the slider 324, with a simple structure, convenient installation, flexible opening and closing, and good stability. Specifically, the first dust-proof structure 3212 is fully laid and installed on the upper side of the fixed skeleton 3211, and the second dust-proof structure 3222 is fully laid and installed on the upper side of the movable skeleton 3221.

[0040] Specifically, the first dust-proof structure 3212 and the second dust-proof structure 3222 are tarpaulins or thin films or metal plates. Of course, for the need of fire safety, when using tarpaulins or thin films, certain flame-retardant and fire-proof properties are required.

[0041] See Figure 4 、 5 , the movable dust-proof plate 322 is driven by a driving structure 326 to slide on the fixed dust-proof plate 321. Specifically, a lead screw 3261 is further installed between the two slide rails 323 at the top of the fixed dust-proof plate 321. Bearing seats 3262 are respectively installed at both ends of the lead screw 3261, and the bearing seats 3262 are fixedly installed with the fixed dust-proof plate 321. The cross beam at the front end of the extended skeleton 3223 is located between the two bearing seats 3262, and a lead screw nut 3263 is further installed on the cross beam at the front end of the extended skeleton 3223. The lead screw nut 3263 is screwed with the lead screw 3261, and the lead screw 3261 extends out of the bearing seat 3262 on the side away from the movable dust-proof plate 322 to form a driving end 3264. In this way, by using a handle or a power tool to rotate the driving end 3264, the movable dust-proof plate 322 can be conveniently opened.

[0042] In a preferred solution, the inner circle dust-proof cover 330 is a flexible sealing structure. Specifically, when using tarpaulins or thin films, certain flame-retardant and fire-proof properties are required.

[0043] Further, the inner circular dust cover 330 can be retracted. Specifically, the upper end of the inner circular dust cover 330 is installed at the end of the movable dust plate 322. A plurality of wire passing holes 331 are longitudinally provided on the inner circular dust cover 330. A pulley 3224 is installed at the end of the inner circular dust cover 330. One end of the wire 325 is located on one side of the fixed dust plate 321. After the other end bypasses the pulley 3224, it passes through the wire passing holes 331 in a crossed manner inside and outside, and then is connected to the bottom of the inner circular dust cover 330. By pulling and retracting the wire 325, the inner circular dust cover 330 can be lifted, folded, retracted, opened, and unfolded and closed.

[0044] See Figure 4 , and a lifting ring 327 is also installed on the fixed dust plate 321. It is convenient to hoist, install, and disassemble the whole through the hoisting tool 400.

[0045] It also includes a dust absorption system (not shown in the figure). The dust absorption system includes an air suction fan and a dust filter. The air suction fan is connected to the dust cover 300 through an air suction pipe, and the air suction fan is connected to the dust filter through an exhaust pipe. During the construction of the stator winding, the air suction fan of the dust absorption system is turned on. The air suction fan sucks the smoke and dust in the dust cover 300 into the dust absorption pipe, and then sends it to the dust filter arranged outside the machine pit. After filtration, it is discharged into the atmosphere.

[0046] Embodiment 2:

[0047] A dust prevention method using the dust prevention system for the machine pit of a hydro-generator set described above includes the following steps:

[0048] S1. Install the annular framework 200. The outer circular columns 201 and the inner circular columns 202 are evenly installed in a circular pattern on the annular foundation pit 100, connected into a ring through the outer circular cross bars 204, then install the radial cross bars 203, and then install the inner circular diagonal bars 205, the support diagonal bars 207, and the radial diagonal bars 206 for reinforcement.

[0049] S2. Install the dust cover 300. First, install the movable dust plate 322 on the fixed dust plate 321, then install the upper end of the outer circular dust cover 310 on the outside of the fixed dust plate 321, and install the upper end of the inner circular dust cover 330 on the inside of the movable dust plate 322.

[0050] S3. Hoist the dust cover 300 onto the annular framework 200 in sequence through the hoisting tool 400, and connect and fix the fixed dust plate 321 to the annular framework 200, where the connecting fastener 3213 on the lower side of the fixed dust plate 321 is connected and fixed to the radial cross bar 203, and the rear edge of the fixed dust plate 321 is placed on the outer circular cross bar 204.

[0051] S4. When operating inside the annular foundation pit 100, the driving end 3264 is rotated to drive the lead screw 3261 to rotate, so that the movable dust-proof plate 322 is extended. At the same time, both the outer circular dust-proof cover 310 and the inner circular dust-proof cover 330 are in the unfolded state. The dust-proof cover 300 completely encloses the annular foundation pit 100 in the construction area of the stator winding of the hydro-generator set, and the dust absorption system is turned on to suck dust.

[0052] S5. When materials need to be hoisted inside the annular foundation pit 100, the movable dust-proof plates 322 of one or more fan-shaped units are retracted, and the inner circular dust-proof cover 330 is retracted to provide a space for material hoisting. Among them, the driving end 3264 is rotated in the reverse direction to drive the lead screw 3261 to rotate, so that the movable dust-proof plates 322 are completely retracted. At the same time, the inner circular dust-proof cover 330 is retracted and opened upward by the traction wire 325 located on one side of the fixed dust-proof plate 321.

Claims

1. A dust-proof system for the pit of a hydro-generating unit, characterized in that: It includes an annular skeleton (200) and a dust cover (300). The annular skeleton (200) is used to be installed at the upper end of the annular foundation pit (100) of the hydro-generating unit. The annular dust cover (300) is installed above the annular skeleton (200). The dust cover (300) is composed of several fan-shaped units. Each fan-shaped unit includes an outer circular dust cover (310), a top dust cover (320), and an inner circular dust cover (330). The top dust cover (320) includes a fixed dust plate (321) and a movable dust plate (322). The fixed dust plate (321) is fixedly installed with the annular skeleton (200). The movable dust plate (322) is installed above the fixed dust plate (321) with radial sliding. The movable dust plate (322) is located on one side of the center of the annular foundation pit (100). The outer circular dust cover (310) is installed and connected with the fixed dust plate (321). The inner circular dust cover (330) is installed and connected with the movable dust plate (322). The inner circular dust cover (330) can be opened and closed; The fixed dust plate (321) includes a fixed skeleton (3211). A first dust-proof structure (3212) is installed on the upper side of the fixed skeleton (3211). A connecting fastener (3213) for connecting and installing with the annular skeleton (200) is installed on the lower side of the fixed skeleton (3211). The movable dust plate (322) includes a movable skeleton (3221). A second dust-proof structure (3222) is installed on the upper side of the movable skeleton (3221). The movable skeleton (3221) is provided with a protruding skeleton (3223) on the side close to the fixed dust plate (321). Two slide rails (323) are installed in parallel in the radial direction at the top of the fixed dust plate (321). A slider (324) cooperating with the slide rail (323) is installed on the lower side of the protruding skeleton (3223). The slider (324) is in sliding cooperation with the slide rail (323); It further includes a dust absorption system. The dust absorption system includes an air suction fan and a dust filter. The air suction fan is communicated with the dust cover (300) through an air suction pipe. The air suction fan is communicated with the dust filter through an exhaust pipe.

2. The dust-proof system for the pit of a hydro-generating unit according to claim 1, wherein: The annular skeleton (200) includes several radial brackets. The adjacent radial brackets are connected into an annular shape through an outer circular cross bar (204). The radial bracket includes an outer circular column (201), an inner circular column (202), and a radial cross bar (203). The two ends of the radial cross bar (203) are respectively installed at the upper ends of the outer circular column (201) and the inner circular column (202). One end of a radial diagonal bar (206) is connected to the lower end of the outer circular column (201), and the other end is connected to the radial cross bar (203). The inner circular columns (202) between adjacent radial brackets are connected through an inner circular diagonal bar (205). One end of a support diagonal bar (207) is connected to the inner circular diagonal bar (205), and the other end is connected to the adjacent inner circular column (202). Installation parts (208) for connecting with the annular foundation pit (100) are provided at the bottoms of the outer circular column (201) and the inner circular column (202).

3. The dust-proof system for the pit of a hydro-generating unit according to claim 1, wherein: The first dust-proof structure (3212) and the second dust-proof structure (3222) are tarpaulins, or thin films, or metal plates.

4. A pit dust-proof system for a hydro-generating unit according to claim 1, characterized in that: The movable dust-proof plate (322) is driven by a driving structure (326) to slide on the fixed dust-proof plate (321). At the top of the fixed dust-proof plate (321) and between two slide rails (323), a lead screw (3261) is installed. At both ends of the lead screw (3261), bearing seats (3262) are installed. The bearing seats (3262) are fixedly installed with the fixed dust-proof plate (321). The cross beam at the front end of the extending skeleton (3223) is located between the two bearing seats (3262). A lead screw nut (3263) is also installed on the cross beam at the front end of the extending skeleton (3223). The lead screw nut (3263) is screwed with the lead screw (3261). The side of the lead screw (3261) away from the movable dust-proof plate (322) extends out of the bearing seat (3262) to form a driving end (3264).

5. The dust-proof system for the pit of a hydro-generating unit according to claim 1, wherein: The inner circular dust-proof cover (330) is a flexible sealing structure.

6. The dust-proof system for the turbine generator pit according to claim 5, characterized in that: The inner circular dust-proof cover (330) can be retracted and extended. The upper end of the inner circular dust-proof cover (330) is installed at the end of the movable dust-proof plate (322). A plurality of wire threading holes (331) are longitudinally provided on the inner circular dust-proof cover (330). A pulley (3224) is installed at the end of the inner circular dust-proof cover (330). One end of a pull wire (325) is located on one side of the fixed dust-proof plate (321). After the other end bypasses the pulley (3224), it sequentially passes through the wire threading holes (331) in a crossed manner inside and outside, and then is connected to the bottom of the inner circular dust-proof cover (330).

7. A dust-proof system for the pit of a water turbine generator set according to claim 1, characterized in that: A lifting ring (327) is also installed on the fixed dust-proof plate (321).

8. A dust prevention method for a water turbine generator pit using the dust prevention system described in claim 4, characterized in that, It includes the following steps: S1. Install the annular skeleton (200); S2. Install the dust-proof cover (300); install the movable dust-proof plate (322) on the fixed dust-proof plate (321), then install the upper end of the outer circular dust-proof cover (310) on the outside of the fixed dust-proof plate (321), and install the upper end of the inner circular dust-proof cover (330) on the inside of the movable dust-proof plate (322); S3. Use a hoisting tool (400) to hoist the dust-proof cover (300) onto the annular skeleton (200) in sequence, and connect and fix the fixed dust-proof plate (321) with the annular skeleton (200); S4. When operating in the annular foundation pit (100), rotate the driving end (3264) to drive the lead screw (3261) to rotate, extend the movable dust-proof plate (322). At the same time, both the outer circular dust-proof cover (310) and the inner circular dust-proof cover (330) are in the unfolded state. The dust-proof cover (300) completely encloses the annular foundation pit (100) of the construction area of the stator winding of the hydro-generator set, and turn on the dust absorption system to suck dust; S5. When materials need to be lifted in the annular foundation pit (100), retract the movable dust-proof plates (322) of one or more fan-shaped units and retract the inner-circle dust-proof cover (330) to provide a space for material hoisting; wherein, reverse rotation of the drive end (3264) drives the lead screw (3261) to rotate, completely retract the movable dust-proof plate (322), and at the same time, when the traction cable (325) is located on one side of the fixed dust-proof plate (321), retract the inner-circle dust-proof cover (330) upward to open it.

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