Anti-skid treatment method for the surface of the runner blades of an axial-flow propeller-type hydro-turbine generator set

Abstract

A method for anti-skid treatment of the surface of the runner blade of an axial-flow propeller-type hydro-turbine generator set comprises the following steps: installing the anti-skid module: placing a spring into a center hole, then placing a core column into the center hole, and during the placement of the core column, ensuring that the positioning protrusion corresponds to the positioning groove; assembling the anti-skid block unit: connecting several anti-skid blocks in series using a series rope, which simultaneously passes through the pipe through-hole and the hole of the core column; fixing the anti-skid module: tightening the locking screw to tighten each anti-skid block in turn, ensuring that the spacing between adjacent anti-skid blocks is consistent; the core column moves downward to clamp the series rope, preventing the anti-skid module from moving; installing the anti-skid sheet: inserting the anti-skid sheet into the top of the base; installing the anti-skid blanket: connecting two adjacent anti-skid block units using a buckle; and installing the magnetic ground anchor: connecting the magnetic ground anchor to the anti-skid blanket using a connecting rope. The present invention replaces the current traditional anti-skid measures for blade operations, thereby ensuring the safety of related operators and improving maintenance efficiency.

Description

[0001] This invention is a divisional application of the “Anti-slip treatment method for the surface of the impeller blades of an axial-flow propeller-type hydro-turbine generator set” (application number: 2021111087672; application date: September 22, 2021). Technical Field

[0002] The invention belongs to the field of anti-skid devices for generator set maintenance, and in particular relates to an anti-skid treatment method for the surface of a runner blade of an axial-flow propeller-type hydro-turbine generator set. Background Art

[0003] During the Class A overhaul of an axial-flow propeller turbine generator set at a hydropower station, workers are required to work on the upper surface of the runner blades for extended periods of time. The upper surface of the blades is approximately 3 meters above the reference surface below. The curvature of the blades, combined with their smooth metal surfaces and the inevitable oil stains that accumulate during the overhaul, makes it extremely easy for workers to slip and fall, resulting in casualties. Currently, overhauling units often involves laying wool felt, a method that presents numerous challenges. For example, the friction coefficient between the felt and the blades is still relatively low, and safety is even more difficult to guarantee when the blades are stained with oil.

[0004] Chinese patent documents CN201930084U disclose a "medical magnetic anti-slip mat" and CN206295226U disclose a "healthcare anti-slip mat embedded with magnets." These patents disclose a technical solution for installing magnets on ordinary anti-slip mats. However, simply installing magnets on an anti-slip mat is not suitable for the runner blades of axial-flow propeller-type hydro-turbine generator sets. Because the blades have an irregular shape and a gradually curved surface structure, existing anti-slip mats are generally cut plastic mats and do not conform well to the curved surface. In addition, when working on the blades, the anti-slip mats need to support heavy equipment. If the anti-slip mat material is too soft, it will have a short service life, insufficient load-bearing capacity, and poor safety performance. Summary of the Invention

[0005] In view of the technical problems existing in the background technology, the anti-skid treatment method for the surface of the impeller blade of the axial-flow propeller-type hydro-turbine generator set provided by the present invention replaces the current anti-skid measures of traditional blade operations to ensure the safety of relevant operators and improve maintenance efficiency.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for anti-skid treatment of the surface of a runner blade of an axial-flow propeller-type hydro-turbine generator set is disclosed. The method employs an anti-skid device comprising a plurality of anti-skid block units, each of which comprises an anti-skid module, a pipe perforation, a series rope, and a connecting ring. The anti-skid module comprises a base, a spring, a core column, a locking screw, a center hole, an anti-skid sheet, a positioning protrusion, and a positioning groove. The method for anti-skid treatment of the surface of a runner blade comprises the following steps:

[0008] S1: Installation of the anti-slip module: After placing the spring into the center hole, place the core column into the center hole. When placing the core column, ensure that the positioning protrusion is aligned with the positioning groove;

[0009] S2: Anti-slip block unit assembly: Use a series rope to connect several anti-slip modules in series, and the series rope passes through the tube holes and the core column holes at the same time;

[0010] S3: Anti-slip module fixation: Tighten the locking screws on each anti-slip module in turn to ensure that the distance between adjacent anti-slip modules is consistent; the core column moves downward to clamp the series rope, so that the anti-slip module cannot move;

[0011] S4: Anti-slip sheet installation: Insert the anti-slip sheet on the top of the base;

[0012] S5: Anti-slip blanket installation: Use buckles to connect two adjacent anti-slip block units;

[0013] S6: Magnetic ground anchor installation: Use the connecting rope to connect the magnetic ground anchor to the anti-slip blanket.

[0014] Preferably, the upper surface of each anti-slip block unit is provided with a protrusion for increasing frictional force, and the lower surface of each anti-slip block unit is provided with a magnet. Two adjacent anti-slip block units are connected by a connecting component. Several anti-slip block units are connected to each other to form an anti-slip blanket, and the edge of the anti-slip blanket is connected to the magnetic ground anchor through a connecting rope; the anti-slip block unit includes several anti-slip modules, and the several anti-slip modules are connected by a series rope, and a rotation distance is provided between two adjacent anti-slip modules.

[0015] Preferably, the anti-skid module is provided with a plurality of pipe through-holes for passing the serial ropes; a plurality of anti-skid modules are connected by a plurality of serial ropes to form an anti-sliding block unit;

[0016] The anti-slip module is a block, each anti-slip module has a protrusion on the upper surface, and the anti-slip block unit is a square structure; each series rope connects two rows of anti-slip modules, and the series rope forms a connecting ring structure at the ends of the two rows of anti-slip modules.

[0017] Preferably, the connecting member is a buckle, which is used to connect the connecting rings of two adjacent anti-slip block units; the connecting rope is used to connect the magnetic ground anchor and the connecting ring at the edge of the anti-slip blanket.

[0018] Preferably, the anti-slip module includes a base, the tube perforations are located on the side of the base, and a fixing member is provided on the base, and the fixing member is used to fix the base on the series rope; the tube perforations include tube perforations arranged in both the transverse and longitudinal directions.

[0019] Preferably, the fixing member includes a spring, a core column and a locking screw. A center hole is provided in the middle of the upper end surface of the base, and the center hole penetrates the tube through-holes in both the transverse and longitudinal directions. The spring and the core column are placed in the center hole, and the locking screw is threadedly connected to the center hole; the core column is provided with holes in both the transverse and longitudinal directions, and the holes on the core column correspond to the tube through-holes.

[0020] Preferably, a positioning protrusion is provided on the side wall of the core column, and a positioning groove is provided on the inner wall of the central hole, and the positioning protrusion and the positioning groove are slidably matched.

[0021] Preferably, a non-slip sheet is detachably provided on the top of the base, a socket is provided on the top of the base, and a plug is provided on the bottom of the non-slip sheet, and the plug is interference fit with the socket.

[0022] This patent can achieve the following beneficial effects:

[0023] 1. Traditional blade anti-skid measures often use methods such as laying wool felt. However, due to the difficulty in fixing wool felt, the curvature of the blade itself and the oil stains on the blade during maintenance, the effectiveness of traditional anti-skid measures is greatly reduced and cannot provide a more reliable anti-skid effect. This patent uses magnetic ground anchors to reliably fix the anti-skid device on the runner blade, and the raised design on the surface of the device ensures a good anti-skid effect.

[0024] 2. This patent adopts the anti-skid unit block method to be laid on the surface of the blade, and each anti-skid unit is connected with a snap buckle, which has the characteristics of easy disassembly and assembly.

[0025] 3. Since the blade has a curved structure, in order to ensure that each anti-slip module in the anti-slip block unit has a good fit with the blade surface, a certain gap is set between each anti-slip module, so that when the anti-slip block unit is bent, a single anti-slip module can fit with the blade surface. However, since a certain gap needs to be left between the anti-slip modules, the anti-slip modules are easy to slide on the serial rope. When people walk, the anti-slip modules will move, and the anti-slip modules may be sparse and uneven, that is, some anti-slip modules are crowded together, and some anti-slip modules are very sparse, causing safety hazards. This technical solution uses a fixed component to lock the serial rope. Compared with traditional bolt fixing or hot melt connection, it has better stability and can withstand a larger weight. The anti-slip modules are not easy to move when the staff walks, and it is safer.

[0026] 4. The anti-slip sheet is detachable and can be easily replaced, which increases the overall service life of the anti-slip mat. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and examples:

[0028] Figure 1 This is the installation effect diagram of the anti-slip device of the present invention Figure 1 ;

[0029] Figure 2 Anti-sliding block unit structure diagram of the present invention;

[0030] Figure 3 This is a structural diagram of the anti-skid module of the present invention;

[0031] Figure 4 Installation effect diagram of the present invention Figure 2 ;

[0032] Figure 5 This is the installation effect diagram of the anti-slip device of the present invention Figure 3 ;

[0033] Figure 6 This is an expanded view of the anti-slip module of the present invention in Example 2;

[0034] Figure 7 This is an expanded view of the fixing member of the present invention in Example 2;

[0035] Figure 8 This is a three-dimensional diagram of the base of the present invention in Example 2;

[0036] Figure 9 This is a cross-sectional view of the base of the present invention in Example 2.

[0037] In the figure: magnetic ground anchor 1, anti-slip block unit 2, anti-slip module 201, base 201.1, spring 201.2, core column 201.3, locking screw 201.4, center hole 201.5, anti-slip sheet 201.6, positioning protrusion 201.7, positioning groove 201.8, pipe through hole 202, series rope 203, connecting ring 204, magnet 3, buckle 4, blade 5. DETAILED DESCRIPTION

[0038] The preferred solution is Figures 1 to 4 As shown, a method for anti-skid treatment of the surface of the runner blade of an axial-flow propeller-type hydro-turbine generator set adopts an anti-skid device. The anti-skid device adopts at least two structural forms. The specific implementation methods are as follows:

[0039] Example 1:

[0040] The anti-slip device includes several anti-slip units 2. Each anti-slip unit 2 has a protrusion on its upper surface that increases friction. Each anti-slip unit 2 has a magnet 3 on its lower surface. Adjacent anti-slip units 2 are connected by a connecting member. Several anti-slip units 2 are connected to form an anti-slip blanket. The edge of the anti-slip blanket is connected to the magnetic anchor 1 via a connecting rope. The anti-slip unit 2 includes several anti-slip modules 201. The anti-slip modules 201 are connected by a series rope 203. There is a rotational gap between adjacent anti-slip modules 201. Figure 5 As shown, since the blade has a curved surface structure, to ensure that the anti-slip block unit 2 has a good fit with the blade surface, a certain gap is set between each anti-slip module 201. This allows a single anti-slip module 201 to fit the blade surface when the anti-slip block unit 2 bends. On the contrary, if the anti-slip modules 201 are too close to each other, when the anti-slip block unit 2 bends, the anti-slip modules 201 will be squeezed and protruded, affecting the fit.

[0041] The anti-slip blanket in this technical solution includes multiple anti-slip block units 2, and the anti-slip block unit 2 includes several anti-slip modules 201. The anti-slip modules 201 are made of PPE fireproof materials, which provide reliable safety protection for hot work on the blades. A magnet 3 is provided at the bottom of each anti-slip module 201.

[0042] Specifically, the anti-slip modules 201 are provided with multiple tube through-holes 202 for threading serial ropes 203. Several anti-slip modules 201 are connected by serial ropes 203 to form the anti-slip block unit 2. The anti-slip modules 201 are cube-shaped, each with a protrusion on its upper surface. The anti-slip block unit 2 has a square structure. Each serial rope 203 connects two rows of anti-slip modules 201, and the serial ropes 203 form connecting rings 204 at the ends of the two rows of anti-slip modules 201.

[0043] The serial rope 203 is a steel wire rope. The side of the anti-skid module 201 is provided with longitudinal and transverse tube holes 202. One serial rope 203 connects two rows of anti-skid modules 201 in series. After multiple rows of anti-skid modules 201 are installed, the serial rope 203 is used to install multiple columns of anti-skid modules 201. After one serial rope 203 is installed, the ends are connected. Figure 2 As shown, a connecting ring 204 structure is formed.

[0044] Furthermore, the connecting member is a buckle 4, which is used to connect the connecting rings 204 of two adjacent anti-slider units 2. The buckle 4 can be replaced by a steel wire rope.

[0045] Furthermore, a connecting rope is used to connect the magnetic anchor 1 and the connecting ring 204 at the edge of the anti-slip blanket. The magnetic anchor 1 plays a role in fixing and limiting. The connecting rope can be a steel wire rope.

[0046] Here's how it works:

[0047] According to the surface area of the blade 5 , several unit squares of the anti-slip device are laid, and then connected to the magnetic anchor 1 in four directions through steel wire ropes to reliably fix it on the surface of the blade 5 .

[0048] For example, in the case of a large domestic axial-flow propeller turbine generator set, each blade occupies approximately 9 square meters, totaling 45 square meters per unit. Once the turbine blades are ready for operation, the anti-slip block unit 2 is attached on-site using the clip 4 and laid onto the blade surface. Magnetic anchors 1 secure the device to the blade in four directions, allowing for inspection and maintenance of the blade surface.

[0049] Example 2:

[0050] Based on Example 1, the anti-slip module 201 is improved as follows:

[0051] In Example 1, since a certain gap needs to be left between the anti-slip modules 201, the anti-slip modules 201 are easy to slide on the serial rope 203. When people move, the anti-slip modules 201 will move, and the anti-slip modules 201 may be sparse and uneven, that is, some anti-slip modules 201 are crowded together, and some anti-slip modules 201 are very sparse, causing safety hazards.

[0052] Preferably, if Figure 6-9 As shown, the anti-slip module 201 includes a base 201.1, a pipe through-hole 202 is located on the side of the base 201.1, and a fixing component is provided on the base 201.1, and the fixing component is used to fix the base 201.1 on the serial rope 203; the pipe through-hole 202 includes pipe through-holes 202 arranged in both the transverse and longitudinal directions.

[0053] The fixing member includes a spring 201.2, a stem 201.3, and a locking screw 201.4. A central hole 201.5 is defined in the middle of the upper end surface of the base 201.1. This hole 201.5 extends through both the transverse and longitudinal tube through-holes 202. The spring 201.2 and stem 201.3 are positioned within this hole, and the locking screw 201.4 is threadedly connected to the hole 201.5. The stem 201.3 is provided with holes in both the transverse and longitudinal directions, each corresponding to the tube through-hole 202. Without the locking screw 201.4 installed, the holes in the stem 201.3 and the tube through-hole 202 are aligned, allowing the string 203 to simultaneously pass through both the hole in the stem 201.3 and the tube through-hole 202. After the tandem rope 203 is installed, the locking screw 201.4 is tightened, and the core column 201.3 moves downward, clamping the tandem rope 203 to the base 201.1. Compared with directly tightening the tandem rope 203 with bolts, using the core column 201.3 to tighten the tandem rope 203 can bend the tandem rope 203 downward, which has a better tightening effect and prevents the base 201.1 from sliding.

[0054] Furthermore, a positioning protrusion 201.7 is provided on the side wall of the stem 201.3, and a positioning groove 201.8 is provided on the inner wall of the central hole 201.5. The positioning protrusion and the positioning groove are slidably engaged with each other to prevent the stem 201.3 from rotating.

[0055] Since the anti-skid sheet 201.6 is a wearing part, it needs to be replaced when the anti-skid sheet 201.6 is severely worn. If the anti-skid module 201 is an integrated structure, the anti-skid module 201 cannot be replaced when it is damaged.

[0056] Preferably, a non-slip sheet 201.6 is detachably provided on the top of the base 201.1, a socket is provided on the top of the base 201.1, and a plug is provided on the bottom of the non-slip sheet 201.6, and the plug is interference fit with the socket.

[0057] A notch is provided at the connection between the base 201.1 and the anti-slip sheet 201.6. The notch is used to reserve operating space for a flat knife. The flat knife is used to lift the anti-slip sheet 201.6 to replace the anti-slip sheet 201.6.

[0058] Preferably, the installation method of the anti-skid treatment method for the surface of the runner blade of the axial-flow propeller-type hydro-turbine generator set comprises the following steps:

[0059] S1: Installation of the anti-slip module 201: After placing the spring 201.2 into the center hole 201.5, place the stem 201.3 into the center hole 201.5. During the placement of the stem 201.3, ensure that the positioning protrusion 201.7 is aligned with the positioning groove 201.8;

[0060] S2: Assembling the anti-slip block unit 2: Connect several anti-slip modules 201 in series using a series rope 203, which passes through both the tube through-hole 202 and the hole of the core column 201.3;

[0061] S3: Secure the anti-slip module 201: Tighten the locking screw 201.4 to tighten each anti-slip module 201 in turn to ensure that the spacing between two adjacent anti-slip modules 201 is consistent; the core column 201.3 moves downward to clamp the series rope 203, so that the anti-slip module 201 cannot move;

[0062] S4: Install the anti-slip sheet 201.6: Insert the anti-slip sheet 201.6 onto the top of the base 201.1;

[0063] S5: Anti-slip blanket installation: Use buckles to connect two adjacent anti-slip block units 2;

[0064] S6: Installation of magnetic ground anchor 1: Use the connecting rope to connect the magnetic ground anchor 1 to the anti-slip blanket.

[0065] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for anti-skid treatment of the surface of the runner blades of an axial-flow propeller-type hydro-turbine generator set, characterized by: An anti-skid device is used, the anti-skid device includes a plurality of anti-skid block units (2), the anti-skid block unit (2) includes an anti-skid module (201), a tube through-hole (202), a series rope (203) and a connecting ring (204); the anti-skid module (201) includes a base (201.1), a spring (201.2), a core column (201.3), a locking screw (201.4), a center hole (201.5), an anti-skid sheet (201.6), a positioning protrusion (201.7) and a positioning groove (201.8); a magnet (3) is provided on the lower surface of each anti-skid block unit (2), two adjacent anti-skid block units (2) are connected by a connecting member, and a plurality of anti-skid block units (2) are connected to each other to form an anti-skid blanket; a method for anti-skid treatment of the surface of a runner blade, The following steps are involved: S1: Installation of the anti-slip module (201): After placing the spring (201.2) into the center hole (201.5), place the core column (201.3) into the center hole (201.5). During the placement of the core column (201.3), ensure that the positioning protrusion (201.7) corresponds to the positioning groove (201.8); S2: Assembling the anti-slip block unit (2): connecting a plurality of anti-slip modules (201) in series using a series rope (203), wherein the series rope (203) simultaneously passes through the tube through-hole (202) and the hole of the core column (201.3); S3: fixing the anti-skid module (201): tightening the locking screw (201.4) to tighten each anti-skid module (201) in turn, ensuring that the spacing between two adjacent anti-skid modules (201) is consistent; The core column (201.3) moves downward to clamp the series rope (203), so that the anti-slip module (201) cannot move; S4: Anti-slip sheet (201.6) installation: Insert the anti-slip sheet (201.6) on the top of the base (201.1); S5: Anti-slip blanket installation: connect two adjacent anti-slip block units (2) using a buckle; S6: Installation of magnetic anchor (1): Connect the magnetic anchor (1) to the anti-slip blanket using a connecting rope.

2. The anti-slip treatment method for the surface of the runner blades of an axial-flow propeller-type hydro-turbine generator set according to claim 1 is characterized in that: The upper surface of each anti-slip block unit (2) is provided with a protrusion for increasing frictional force, and the edge of the anti-slip blanket is connected to the magnetic ground anchor (1) via a connecting rope; the anti-slip block unit (2) comprises a plurality of anti-slip modules (201), the plurality of anti-slip modules (201) are connected via a series rope (203), and a rotational spacing is provided between two adjacent anti-slip modules (201).

3. The anti-skid treatment method for the surface of the runner blades of an axial-flow propeller-type hydro-turbine generator set according to claim 2, characterized in that: The anti-skid module (201) is provided with a plurality of pipe through-holes (202), and the pipe through-holes (202) are used for passing the serial ropes (203); a plurality of anti-skid modules (201) are connected via the plurality of serial ropes (203) to form an anti-sliding block unit (2); The anti-skid modules (201) are cubes, and each anti-skid module (201) is provided with a protrusion on its upper surface. The anti-skid block unit (2) is a square structure. Each series rope (203) connects two rows of anti-skid modules (201), and the series ropes (203) form a connecting ring (204) structure at the ends of the two rows of anti-skid modules (201).

4. The anti-skid treatment method for the surface of the runner blades of an axial-flow propeller-type hydro-turbine generator set according to claim 3 is characterized in that: The connecting member is a buckle (4), and the buckle (4) is used to connect the connecting rings (204) of two adjacent anti-slip block units (2); and the connecting rope is used to connect the magnetic ground anchor (1) and the connecting ring (204) at the edge of the anti-slip blanket.

5. The anti-skid treatment method for the surface of the runner blades of an axial-flow propeller-type hydro-turbine generator set according to claim 4 is characterized in that: The anti-slip module (201) comprises a base (201.1), a tube through-hole (202) located on a side of the base (201.1), a fixing member provided on the base (201.1), and the fixing member being used to fix the base (201.1) on the series rope (203); the tube through-hole (202) comprises tube through-holes (202) arranged in both the transverse and longitudinal directions.

6. The anti-skid treatment method for the surface of the runner blades of an axial-flow propeller-type hydro-turbine generator set according to claim 5, characterized in that: The fixing member comprises a spring (201.2), a core column (201.3) and a locking screw (201.4); a center hole (201.5) is provided in the middle of the upper end surface of the base (201.1); the center hole (201.5) simultaneously penetrates the tube through-hole (202) in both the transverse and longitudinal directions; the spring (201.2) and the core column (201.3) are placed in the center hole (201.5); the locking screw (201.4) is threadedly connected to the center hole (201.5); and the core column (201.3) is provided with holes in both the transverse and longitudinal directions, and the holes on the core column (201.3) correspond to the tube through-hole (202).

7. The anti-skid treatment method for the surface of the runner blades of an axial-flow propeller-type hydro-turbine generator set according to claim 6, characterized in that: A positioning protrusion (201.7) is provided on the side wall of the core column (201.3), and a positioning groove (201.8) is provided on the inner wall of the center hole (201.5), wherein the positioning protrusion and the positioning groove are in sliding engagement.

8. The anti-skid treatment method for the surface of the runner blades of an axial-flow propeller-type hydro-turbine generator set according to claim 7, characterized in that: The top of the base (201.1) is detachably provided with an anti-slip sheet (201.6), the top of the base (201.1) is provided with a socket, and the bottom of the anti-slip sheet (201.6) is provided with an insertion column, which is interference-fitted with the insertion column and the socket.

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