Safety ladder for painting shaft hole sand core of large wind power casting

Abstract

The utility model discloses a safety ladder for painting a shaft hole sand core of a large-scale wind power casting, relates to the technical field of ladders, and aims to solve the problems that a traditional ladder is poor in fitting property on the surface of the sand core, insufficient in stability, incapable of adapting to the sand core with large diameter difference and the like. The ladder body is of a frame structure composed of longitudinal rods and transverse rods, arc-shaped inwards-concave main rubber mats are installed on the tops of the inner sides of the longitudinal rods, and the top faces of the transverse rods are obliquely arranged so as to enhance the standing stability of people; the lap joint positions of the reinforcing parts are adjusted through telescopic supporting rods and sliding block structures, and auxiliary rubber pads are arranged at the tail ends of the supporting rods to adapt to the surfaces of sand cores with different diameters; the supporting part adopts a gear and arc-shaped tooth meshing mechanism to realize angle adjustment of the base and ensure that the bottom of the ladder body is in full contact with the ground. According to the utility model, the fitness and the stability of the ladder body and the sand core are obviously improved through structural optimization, the slippage risk is reduced, and the device is suitable for brushing operation of the truncated cone-shaped sand core, and is particularly suitable for the scene of the sand core with a large bottom diameter and a small top diameter.

Description

Technical Field

[0001] This utility model relates to the field of ladder technology, specifically a safety ladder for coating the sand core of the shaft hole of a large wind turbine casting. Background Technology

[0002] Large wind turbine castings, such as main shafts and bearing housings, are core components of the wind turbine generator's transmission chain. Their casting quality directly impacts the reliability and safety of the unit's operation. These castings are enormous in size and weight, with a base diameter of 2.5-4.5 meters and a height of 2.8-5.6 meters. They require the fabrication of shaft hole sand cores using resin sand molding. Due to the massive size of these sand cores, which are surrounded by molten iron during casting, improper surface treatment can easily lead to defects such as sand adhesion and sand holes within the casting's internal cavity. Currently, the sand core coating process requires manual labor, involving climbing ladders to apply three coats of coating, grinding, and quality inspection to ensure sand core quality.

[0003] When a traditional ladder is placed on the circumference of a sand core with a large bottom diameter, the poor fit and insufficient contact area between the ladder and the sand core, due to the sand core's frustum shape and smooth surface, makes the ladder prone to slipping or wobbling during operation, resulting in insufficient stability. Furthermore, while a traditional ladder can directly contact a sand core with a large bottom diameter, it cannot provide effective support if the coating is located on a sand core with a small top diameter. Longer ladders are typically used to allow direct contact with sand cores with smaller top diameters, but excessively long ladders are inherently unstable, and the support and fixation at the bottom of the ladder also deteriorate, making it unsuitable for sand cores. Workers must frequently adjust the ladder's position, further exacerbating safety hazards. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes a safety ladder for coating sand cores in the shaft holes of large wind turbine castings. This ladder solves the problems of poor ladder stability, significant safety hazards, and incompatibility with sand cores, particularly in sand core coating processes with large diameter differences. To achieve the above objectives, this utility model provides a safety ladder for coating sand cores in the shaft holes of large wind turbine castings, comprising:

[0005] The ladder body has an opening on its inner side and includes: longitudinal bars and transverse bars. Several transverse bars are arranged sequentially between two longitudinal bars and are fixedly connected to the longitudinal bars. A first rubber pad is installed on the top inner side of the longitudinal bars, and a longitudinal first groove is provided on the top of the longitudinal bars.

[0006] The reinforcement includes: a support column, a first support rod, a second support rod, a first slider, a second slider, a bolt post, and a nut; the support column is installed inside the ladder body, passes through the top horizontal bar, and is connected to the vertical bar; the support column is rotatably connected to the first support rod, the first support rod is housed inside the vertical bar, the first support rod is rotatably connected to the second support rod, the second support rod is rotatably connected to the bolt post, the bolt post passes through the first slider, the second slider, and the nut, the first slider is slidably connected in the first groove, the second slider is provided on both sides of the first slider, and the nut locks the second slider to the outer surface of the vertical bar;

[0007] The support unit includes a base, a rotating rod, a gear, an arc-shaped tooth, and a locking cap. The base is rotatably connected to the bottom of the ladder. An arc-shaped tooth is installed on the top of the base, and the arc-shaped tooth meshes with the gear. The gear is installed on the rotating rod that passes through the two vertical rods. A locking cap is installed at the end of the rotating rod.

[0008] Preferably, the top surface of the crossbar is inclined downwards from the inside of the ladder body to the outside of the ladder body.

[0009] Preferably, an arc-shaped plate is installed between the longitudinal bar and the first rubber pad.

[0010] Preferably, a second rubber pad is installed at the end of the first support rod away from the support post, and the end face of the second rubber pad is concave.

[0011] Preferably, the end face of the first rubber pad in contact with the sand core is arc-shaped from top to bottom, the end face of the first rubber pad is concave, and the top volume of the first rubber pad is smaller than the bottom volume of the first rubber pad.

[0012] Preferably, the first support rod is rotatably connected to the second support rod via a pin.

[0013] Preferably, the locking cap and the rotating rod are locked together by threads.

[0014] Preferably, the first adhesive pad is pasted to the inside of the longitudinal bar along the longitudinal bar direction.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This utility model's safety ladder increases the contact area with the sand core through rubber pads on the ladder body, enhancing the fit between the ladder and the circumference of the sand core, expanding the contact area, and evenly distributing friction. Secondly, the first support rod in the reinforcing section overlaps with the sand core platform with a larger bottom diameter, increasing the ladder's sturdiness and stability. Furthermore, this overlapping process allows personnel to reach the smaller diameter sand core at the top of the ladder, preventing instability caused by the middle of the ladder overlapping the edge of the larger diameter sand core. Simultaneously, the ladder's angle can be adjusted according to the base, accommodating placement at multiple angles, ensuring that the contact area between the bottom of the ladder and the ground is always at its maximum. Attached Figure Description

[0017] Figure 1 This is a 3D structural diagram of a safety ladder.

[0018] Figure 2 A three-dimensional structural diagram of the reinforcement section of the safety ladder.

[0019] Figure 3 This is a plan view of the reinforcement section of the safety ladder.

[0020] Figure 4 This is a three-dimensional structural diagram of the safety ladder support.

[0021] Figure 5 This is a 3D view of the sand core of the shaft hole in a wind turbine casting.

[0022] In the picture:

[0023] 101. Longitudinal bar; 102. Crossbar; 103. First rubber pad; 104. First groove; 105. Curved plate.

[0024] 201. Support column; 202. First support rod; 203. Second support rod; 204. First slider; 205. Second slider; 206. Bolt column; 207. Nut; 208. Second rubber pad; 209. Pin.

[0025] 301. Base; 302. Rotating rod; 303. Gear; 304. Arc-shaped tooth; 305. Locking cap.

[0026] 401. First platform; 402. Second platform. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will be described below based on its overall structure.

[0029] Please see Figures 1-5 This utility model provides a technical solution: a safety ladder for coating the sand core of the shaft hole of a large wind turbine casting, comprising:

[0030] The ladder body has an inner opening and includes: a vertical bar 101 and a horizontal bar 102. Several horizontal bars 102 are arranged sequentially between two vertical bars 101 and are fixedly connected to the vertical bars 101. A first rubber pad 103 is installed on the inner top of the vertical bar 101, and a longitudinal first groove 104 is provided on the top of the vertical bar 101.

[0031] The reinforcement includes: a support column 201, a first support rod 202, a second support rod 203, a first slider 204, a second slider 205, a bolt post 206, and a nut 207; the support column 201 is installed inside the ladder body, the support column 201 passes through the top horizontal bar 102 and is connected to the vertical bar 101; the support column 201 is rotatably connected to the first support rod 202, the first support rod 202 is housed inside the vertical bar 101, the first support rod 202 is rotatably connected to the second support rod 203, the second support rod 203 is rotatably connected to the bolt post 206, the bolt post 206 is installed through the first slider 204, the second slider 205 and the nut 207, the first slider 204 is slidably connected in the first slide groove 104, the second slider 205 is provided on both sides of the first slider 204, and the nut 207 locks the second slider 205 to the outer surface of the vertical bar 101;

[0032] The support includes: a base 301, a rotating rod 302, a gear 303, an arc-shaped tooth 304, and a locking cap 305. The base 301 is rotatably connected to the bottom of the ladder. The arc-shaped tooth 304 is installed on the top of the base 301. The arc-shaped tooth 304 meshes with the gear 303. The gear 303 is installed on the rotating rod 302 that passes through the two vertical rods 101. The locking cap 305 is installed at the end of the rotating rod 302.

[0033] This ladder increases the contact area with the first platform 401 and the second platform 402 of the sand core through the first rubber pad 103 on the ladder body, enhancing the fit between the ladder and the circumferential surface of the sand core, expanding the contact area and evenly distributing friction. Secondly, the first support rod 202 in the reinforcing part overlaps on the platform of the first platform 401 of the sand core with a larger bottom diameter, increasing the sturdiness and stability of the ladder body. Furthermore, through the overlapping process, personnel can reach the second platform 402 from the ladder, avoiding the situation where the middle of the ladder overlaps at the top edge of the first platform 401 due to the large diameter difference between the first and second platforms 401, resulting in poor stability. Simultaneously, the ladder can be adjusted at multiple angles according to the base 301, ensuring that the contact area between the bottom of the ladder and the ground is always at its maximum.

[0034] The top surface of the crossbar 102 is inclined downwards from the inside of the ladder to the outside of the ladder. This is because if the top surface of the crossbar 102 is not inclined when the ladder is placed at an angle, it will cause people to lose their balance. Therefore, it is set to be inclined. At the same time, a square structure is adopted to increase the contact area and improve the safety of people working.

[0035] An arc-shaped plate 105 is installed between the longitudinal bar 101 and the first rubber pad 103. The function of the arc-shaped plate 105 is to further increase the stability of the ladder. The arc-shaped plate 105 forms a wrapping posture by contacting the outer surface of the sand core. The arc-shaped plate 105 can be a steel plate with elastic characteristics. The arc-shaped plate 105 is clamped on the outer surface of the sand core.

[0036] A second rubber pad 208 is installed at the end of the first support rod 202 furthest from the support column 201. The end face of the second rubber pad 208 is concave. The main purpose of the second rubber pad 208 is to allow flexible contact between the smaller diameter of the sand core and the outer surface of the smaller diameter sand core through the first rubber pad 103, avoiding damage to the sand core caused by rigid contact. At the same time, the concave end face also increases the contact area with the outer surface of the sand core, thereby increasing stability. The concave radius of the second rubber pad 208 is suitable for sand core diameter ranges R = 1.25-2.25m, and the surface is provided with anti-slip texture with a depth of 2mm.

[0037] The end face of the first rubber pad 103, which contacts the sand core, is arc-shaped from top to bottom. The end face of the first rubber pad 103 is concave, and the volume of the top of the first rubber pad 103 is smaller than the volume of the bottom of the first rubber pad 103. The arc shape of the first rubber pad 103 is mainly because the ladder is tilted when placed on the surface of the sand core. Therefore, the top of the ladder needs to have a large contact area with the sand core without affecting stability. The first rubber pad 103 is designed as an arc structure so that even in the tilted state, the maximum contact area between the first rubber pad 103 and the sand core can be guaranteed. In addition, the concave end face of the first rubber pad 103 is also designed to conform to the outer surface structure of the sand core.

[0038] The first support rod 202 is rotatably connected to the second support rod 203 via a pin 209, but is not limited to the above structure; it can be a pin, rivet, or other parts.

[0039] The locking cap 305 and the rotating rod 302 are locked together by threads, but the structure is not limited to the above. The main purpose is to prevent the gear 303 from rotating by the locking operation of the rotating rod 302 and the locking cap 305, thereby locking the arc-shaped tooth 304 and finally locking the base 301.

[0040] The first adhesive pad 103 is pasted along the longitudinal rod 101 to the inside of the longitudinal rod 101. The pasting position of the first adhesive pad 103 is not limited to the top of the longitudinal rod 101, but can also be pasted on the longitudinal rod 101 below the first support rod 202. The position of the first adhesive pad 103 is fixed as needed. The first adhesive pad 103 is made of wear-resistant rubber with a Shore hardness of 70±5, a thickness of 15mm, and a coefficient of friction ≥0.8.

[0041] The first support rod 202 and the second support rod 203 are made of Q345B steel pipe with a wall thickness of 3mm and a tensile strength of ≥470MPa. The load-bearing capacity of the pin shaft 209 connection is ≥200kg. The angle adjustment range of the base 301 is 0°-40°. The gear 303 can be selected with a module m=2 and a tooth profile angle of 20° to ensure meshing stability.

[0042] Working principle: Place the top of the ladder on the outer surface of the first body 401 of the sand core, adjust the angle of the base 301 of the support part, and lock it in place before painting. At the same time, adjust the tilt angle of the ladder and the rotation angle of the base 301 to paint the entire outer surface of the first body 401.

[0043] If the outer surface of the second platform 402 is to be coated, the first support rod 202, which is stored in the vertical rod 101, is pulled out and its angle is adjusted. The first support rod 202 is then locked in place by the second slider 205 so that the first support rod 202 can fully overlap the upper surface of the first platform 401. Then, the base 301 is adjusted according to the inclination angle of the ladder so that it is in full contact with the ground. Depending on the actual needs, it can be decided whether the first adhesive pad 103 on the ladder should overlap the outer surface of the second platform 402. If it can overlap, the ladder will be more stable and the construction process will be easier. If it cannot overlap, the first adhesive pad 103 can be pasted to the inside of the vertical rod 101 below the first support rod 202, which will also make the ladder more stable and allow the second platform 402 to be coated.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended to encompass all variations falling within the meaning and scope of equivalents of the claims within this invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

Claims

1. A safety ladder for coating sand cores in shaft holes of large wind turbine castings, characterized in that, include: The ladder body has an inner opening and includes: a vertical bar (101) and a horizontal bar (102). A plurality of the horizontal bars (102) are arranged sequentially between two vertical bars (101) and are fixedly connected to the vertical bars (101). A first rubber pad (103) is installed on the top inner side of the vertical bar (101), and a longitudinal first groove (104) is provided on the top of the vertical bar (101). The reinforcing component includes: a support column (201), a first support rod (202), a second support rod (203), a first slider (204), a second slider (205), a bolt post (206), and a nut (207); the support column (201) is installed inside the ladder body, the support column (201) passes through the top horizontal bar (102) and is connected to the vertical bar (101); the support column (201) is rotatably connected to the first support rod (202), the first support rod (202) is housed inside the vertical bar (101), and the first support rod (203) is... A first rod (202) is rotatably connected to a second rod (203), and the second rod (203) is rotatably connected to a bolt post (206). The bolt post (206) passes through a first slider (204), a second slider (205), and a nut (207). The first slider (204) is slidably connected in a first groove (104). The second sliders (205) are provided on both sides of the first slider (204). The nut (207) locks the second sliders (205) to the outer surface of the longitudinal rod (101). The support includes: a base (301), a rotating rod (302), a gear (303), an arc-shaped tooth (304), and a locking cap (305). The base (301) is rotatably connected to the bottom of the ladder. The arc-shaped tooth (304) is installed on the top of the base (301). The arc-shaped tooth (304) meshes with the gear (303). The gear (303) is installed on the rotating rod (302) that passes through the two vertical rods (101). The locking cap (305) is installed at the end of the rotating rod (302).

2. The safety ladder for coating the sand core of the shaft hole of a large wind turbine casting as described in claim 1, characterized in that, The top surface of the crossbar (102) is inclined downward from the inside of the ladder body to the outside of the ladder body.

3. The safety ladder for coating the sand core of the shaft hole of a large wind turbine casting as described in claim 1, characterized in that, An arc plate (105) is installed between the longitudinal rod (101) and the first rubber pad (103).

4. The safety ladder for coating the sand core of the shaft hole of a large wind turbine casting as described in claim 1, characterized in that, A second rubber pad (208) is installed at the end of the first support rod (202) away from the support column (201), and the end face of the second rubber pad (208) is concave.

5. The safety ladder for coating the sand core of the shaft hole of a large wind turbine casting as described in claim 1, characterized in that, The end face of the first rubber pad (103) in contact with the sand core is arc-shaped from top to bottom. The end face of the first rubber pad (103) is concave. The top volume of the first rubber pad (103) is smaller than the bottom volume of the first rubber pad (103).

6. The safety ladder for coating the sand core of the shaft hole of a large wind turbine casting according to claim 1, characterized in that, The first support rod (202) is rotatably connected to the second support rod (203) via a pin (209).

7. The safety ladder for coating the sand core of the shaft hole of a large wind turbine casting as described in claim 1, characterized in that, The locking cap (305) and the rotating rod (302) are locked together by threads.

8. The safety ladder for coating the sand core of the shaft hole of a large wind turbine casting according to claim 1, characterized in that, The first adhesive pad (103) is attached to the inside of the longitudinal bar (101) along the direction of the longitudinal bar (101).

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