Spraying equipment and spraying method for inner wall of wind power tower

Abstract

The invention discloses wind power tower inner wall spraying equipment and a spraying method, and relates to the technical field of wind power tower inner wall spraying, the wind power tower inner wall spraying equipment comprises a fixed seat, a first threaded rod and a mounting seat, the top end of the fixed seat is rotationally connected with a rotating rod, the bottom end of the fixed seat is rotationally connected with a first supporting rod, and spraying columns are mounted on the outer wall of the rotating rod at equal intervals; according to the device, a threaded rod transmission structure driven by the first motor is matched with hinged linkage of the first supporting rod and the second supporting rod, and stable extension of the mounting base and the extrusion base towards the inner wall of the tower drum can be achieved. Meanwhile, by means of a hydraulic system composed of the extrusion rod, the piston, the sleeve and the oil conveying pipe, when the angle of the supporting rod changes, the extrusion base can be pushed to further stretch out through pressure transmission of hydraulic oil, it is guaranteed that the extrusion base is tightly attached to the inner wall of the tower barrel, the thickness consistency of the coating at all positions of the inner wall of the tower barrel is guaranteed, and the spraying quality is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power tower inner wall spraying, in particular to a wind power tower inner wall spraying device and a spraying method. BACKGROUND

[0002] With the growing demand for clean energy worldwide, wind power generation as a sustainable energy solution occupies an increasingly important position in the energy field. As a key supporting structure of the wind power generation system, the performance and durability of the wind power tower directly affect the safe and stable operation of the entire wind power facility. Due to the long-term exposure of the wind power tower to various complex natural environments, especially in harsh conditions such as high humidity and strong acid and alkali, the inner wall of the tower is prone to corrosion, which not only reduces the structural strength of the tower, but also may cause safety hazards, seriously affecting the service life and reliability of the wind power facility. Therefore, it is crucial to effectively apply protective coating to the inner wall of the wind power tower.

[0003] Currently, the commonly used methods in wind power tower inner wall spraying operations mainly include manual spraying and some traditional automated spraying equipment assisted operations. Manual spraying relies on the operator to hold a spray gun for spraying, which has many drawbacks. On the one hand, manual operation cannot guarantee the uniformity and consistency of the coating, and local coating may be too thick or too thin, affecting the protective effect of the coating. On the other hand, the interior space of the wind power tower is narrow and the working environment is harsh, and long-term manual spraying operation not only has high labor intensity, but also threatens the health of the operator, and the operation efficiency is low, which is difficult to meet the needs of large-scale wind power project construction and maintenance.

[0004] Some traditional automated spraying equipment has improved the spraying efficiency to some extent, but obvious defects have been exposed in actual application. The existing spraying equipment is difficult to be stably and accurately fixed at the center position of the tower after entering the interior of the wind power tower. Since the inner wall of the wind power tower is not a completely regular cylindrical shape, and the diameters at different height positions may have some differences, the fixing structure of the traditional equipment lacks flexible adjustment ability and cannot adaptively adjust its position according to the actual size changes in the interior of the tower, resulting in the equipment deviating from the center during the spraying process. When the equipment deviates from the center, the distance between the spray column and the inner wall of the tower will be obviously uneven, the coating in the area with a short distance is prone to be too thick, and the coating in the area with a long distance is prone to be too thin, which seriously affects the uniformity of the spraying. Such uneven coating not only reduces the protective effect, but also may cause cracking and peeling due to local coating being too thick, further shortening the maintenance period of the tower. In addition, due to unstable fixation, the equipment may also sway during the rotating spraying process, aggravating the deviation of the spraying, so that the coating quality of the entire inner wall of the tower is uneven and cannot meet the design requirements of the protection standard.

[0005] To this end, we propose a wind turbine tower inner wall spraying equipment and spraying method. SUMMARY

[0006] The purpose of the present application is to provide a wind turbine tower inner wall spraying equipment and spraying method to solve the problems raised in the background art.

[0007] To achieve the above object, the present application provides the following technical solutions: a wind turbine tower inner wall spraying equipment, comprising a fixed seat, a first threaded rod and a mounting seat, the top end of the fixed seat is rotatably connected with a rotating rod, the bottom end of the fixed seat is rotatably connected with a first support rod, the outer wall of the rotating rod is equidistantly provided with a spray column, one side of the spray column is equidistantly provided with a spray head, one side of the fixed seat is rotatably connected with a first threaded rod, the outer wall of the fixed seat is slidably connected with a sliding ring, the sliding ring is threadedly connected with the first threaded rod, the bottom end of the sliding ring is equidistantly rotatably connected with a second support rod, one end of a plurality of the first support rods and a plurality of the second support rods are hingedly connected, one end of the first support rod and the second support rod hingedly connected is rotatably connected with the mounting seat, and one side of the mounting seat is slidably provided with an extrusion seat.

[0008] Preferably, the bottom end of the first threaded rod is fixedly connected with a worm gear, the bottom end of the fixed seat is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a worm, and the worm is meshingly connected with the worm gear.

[0009] Preferably, the top end of the fixed seat is fixedly connected with a second motor, the output end of the second motor is fixedly connected with a pinion, the bottom end of the rotating rod is fixedly connected with a gear, and the gear is meshed between the pinion.

[0010] Preferably, the top end of the rotating rod is fixedly connected with a third motor, the inside of the rotating rod is rotatably connected with a second threaded rod, the output end of the third motor is fixedly connected with one end of the second threaded rod, the inside of the rotating rod is slidably connected with a support plate, and the support plate is connected with the second threaded rod.

[0011] Preferably, the outer wall of the rotating rod is equidistantly rotatably connected with two third support rods, one end of the two third support rods is rotatably connected with the back of the spray column, and one end of the support plate is slidably connected with one of a plurality of the third support rods.

[0012] Preferably, the inner wall of the first support rod and the second support rod is slidably connected with an extrusion rod through a ball head, one end of the two extrusion rods close to each other is fixedly connected with a first piston, the outer wall of the two first pistons is slidably connected with a sleeve, and the outer wall of the sleeve is symmetrically fixedly connected with an oil pipe.

[0013] Preferably, the inner wall of the mounting seat is provided with a containing cavity, the inner wall of the containing cavity is slidably connected with a second piston, one end of the second piston is fixedly connected with the extrusion seat, and the oil pipe is in communication with the containing cavity.

[0014] Preferably, the inside of the sleeve, the oil pipe and the containing cavity is injected with hydraulic oil.

[0015] Preferably, a torsion spring is installed at the connection between the mounting base and the first and second struts.

[0016] A wind power tower inner wall spraying method, comprising the following steps:

[0017] S1, equipment hoisting in place: the spraying equipment is hoisted to the to-be-sprayed area inside the wind power tower, and the equipment is ensured to be in a substantially central position, at this time, the first and second struts are in a retracted state, so that the equipment smoothly enters the inside of the tower;

[0018] S2, driving the struts to expand and preliminarily fix: the first motor is started, the output end of the first motor drives the worm to rotate, since the worm is meshed and connected with the worm gear, the worm gear rotates with the worm and drives the first threaded rod to rotate, the sliding ring connected with the first threaded rod slides downward along the outer wall of the fixed seat, the sliding ring drives one end of the second strut to descend, so that the hinge joint of the first and second struts stretches outward, and the mounting base and the extrusion seat gradually approach and preliminarily contact the inner wall of the tower;

[0019] S3, hydraulic auxiliary close fixing: during the expansion of the first and second struts, the angle between the two gradually decreases, driving the extrusion rods of the inner wall to approach each other, the extrusion rods push the first piston to slide in the sleeve, the hydraulic oil in the sleeve is pressed into the containing cavity of the mounting base through the oil pipe, pushing the second piston and the extrusion seat to further stretch out to the inner wall of the tower, so that the extrusion seat tightly abuts against the inner wall of the tower, and the stable fixing of the equipment in the tower is realized by the action of the torsion spring;

[0020] S4, adjusting the position of the spray column: the third motor is started, the third motor drives the second threaded rod to rotate, the strut plate connected with the second threaded rod slides in the rotating rod, one end of the strut plate is slidably connected with one side of the third strut, driving the third strut to rotate along the outer wall of the rotating rod, since the third strut is rotatably connected with the back of the spray column, under the action of the parallelogram structure, the spray column is adjusted to an appropriate spraying distance by approaching the inner wall of the tower;

[0021] S5, rotating spraying operation: the second motor is started, the output end of the second motor drives the pinion to rotate, the pinion is meshed and driven with the gear, so that the gear drives the rotating rod to rotate, the spray column on the outer wall of the rotating rod rotates synchronously with the rotating rod, and the spray head on one side of the spray column starts to spray paint, and uniform spraying operation is performed on the inner wall of the tower.

[0022] Compared with the prior art, the wind power tower inner wall spraying method has the following beneficial effects:

[0023] In terms of device fixing and center positioning, the device adopts a threaded rod transmission structure driven by a first motor, cooperates with the hinged linkage of the first and second support rods, and can realize the stable extension of the mounting seat and the extrusion seat to the inner wall of the tower cylinder. At the same time, with the help of the hydraulic system composed of the extrusion rod, the piston, the sleeve and the oil pipe, when the angle of the support rod changes, the extrusion seat can be further extended by the pressure transmission of the hydraulic oil, ensuring that the extrusion seat closely fits the inner wall of the tower cylinder. In addition, the pre-tightening force provided by the torsion spring enables the device to adapt to the slight diameter change of the inner wall of the tower cylinder and accurately fix at the center position of the tower cylinder. This advantage effectively solves the problem of spraying deviation caused by unstable fixing or deviation from the center of the traditional device, lays a solid foundation for subsequent uniform spraying, ensures the consistency of the coating thickness at each position of the inner wall of the tower cylinder, and greatly improves the spraying quality.

[0024] In terms of spray column adjustment, the third motor drives the second threaded rod to rotate, promotes the sliding of the support plate in the rotating rod, and then drives the spray column to move through the third support rod. Since the third support rod, the rotating rod and the spray column form a parallelogram structure, the spray column can always maintain a parallel posture with the rotating rod during movement, realizing accurate adjustment of the distance between the spray column and the inner wall of the tower cylinder. This adjustment method is flexible and efficient, and can quickly adjust the position of the spray column according to different diameter specifications of the tower cylinder or diameter changes at different heights of the same tower cylinder, ensuring that the spray head is always at the optimal spraying distance, avoiding the phenomenon of too thick or too thin coating caused by improper distance, and further improving the uniformity of spraying.

[0025] In terms of rotating spraying operation, the second motor drives the rotating rod to rotate stably through the meshing transmission of the pinion and the gear, and the spray column makes a concentric circular motion with the rotating rod. Since the device has been accurately fixed at the center of the tower cylinder, the concentric circular ring formed by the rotating track of the spray column can uniformly cover the inner wall of the tower cylinder, and the coating coverage areas of adjacent circular rings overlap each other, ensuring the continuity and integrity of the coating. This rotating spraying method not only replaces manual spraying, reduces the labor intensity of the operator, avoids the harm of harsh environment to the human body, but also significantly improves the spraying efficiency, can quickly complete large-area spraying operation, and meets the needs of large-scale wind power project construction and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The schematic diagram of the internal structure of the spraying device of the present application is located in the wind power tower cylinder;

[0027] Figure 2 The schematic diagram of the structure of the spraying device of the present application is one of the schematic diagrams of the structure of the spraying device of the present application;

[0028] Figure 3 The schematic diagram of the structure of the spraying device of the present application is one of the schematic diagrams of the structure of the spraying device of the present application;

[0029] Figure 4 The schematic diagram of the overall structure of the fixing seat of the present application is the schematic diagram of the overall structure of the fixing seat of the present application;

[0030] Figure 5 It is a schematic diagram of the partial cross-section structure of the sleeve of the application;

[0031] Figure 6 It is a schematic diagram of the side view cross-section structure of the rotating rod of the application;

[0032] Figure 7 It is Figure 5 the enlarged view at A;

[0033] Figure 8 It is Figure 5 the enlarged view at B.

[0034] In the figure: 1, fixed seat; 2, rotating rod; 3, first support rod; 4, spray column; 5, first threaded rod; 6, sliding ring; 7, second support rod; 8, mounting seat; 9, extrusion seat; 21, worm gear; 22, first motor; 23, worm; 31, second motor; 32, pinion; 33, gear; 41, third motor; 42, second threaded rod; 43, support plate; 51, third support rod; 61, extrusion rod; 62, first piston; 63, sleeve; 64, oil delivery pipe; 71, containing cavity; 72, second piston. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0036] Please refer to Figures 1-8 shown, the wind power tower inner wall spraying equipment and spraying method, including fixed seat 1, first threaded rod 5 and mounting seat 8, the top end of fixed seat 1 is rotatably connected with rotating rod 2, the bottom end of fixed seat 1 is rotatably connected with first support rod 3 respectively, the outer wall of rotating rod 2 is equidistantly installed with spray column 4, one side of spray column 4 is equidistantly installed with spray head, one side of fixed seat 1 is rotatably connected with first threaded rod 5, the outer wall of fixed seat 1 is slidably connected with sliding ring 6, sliding ring 6 is threadedly connected with first threaded rod 5, the bottom end of sliding ring 6 is equidistantly rotatably connected with second support rod 7, one end of a plurality of first support rods 3 and a plurality of second support rods 7 is hingedly connected, one end of first support rod 3 and second support rod 7 being hingedly connected is rotatably connected with mounting seat 8, one side of mounting seat 8 is slidably installed with extrusion seat 9, torsion spring is installed at the connection between mounting seat 8 and first support rod 3 and second support rod 7.

[0037] The bottom end of the first threaded rod 5 is fixedly connected with a worm gear 21, the bottom end of the fixed seat 1 is fixedly connected with a first motor 22, the output end of the first motor 22 is fixedly connected with a worm 23, and the worm 23 is meshed with the worm gear 21.

[0038] The top end of the fixed seat 1 is fixedly connected with a second motor 31, the output end of the second motor 31 is fixedly connected with a pinion 32, the bottom end of the rotating rod 2 is fixedly connected with a gear 33, and the gear 33 is meshed with the pinion 32.

[0039] The top end of the rotating rod 2 is fixedly connected with a third motor 41, the inside of the rotating rod 2 is rotatably connected with a second threaded rod 42, the output end of the third motor 41 is fixedly connected with one end of the second threaded rod 42, the inside of the rotating rod 2 is slidably connected with a support plate 43, and the support plate 43 is connected with the second threaded rod 42.

[0040] The outer wall of the rotating rod 2 is equidistantly rotatably connected with two third supporting rods 51, one end of each of the two third supporting rods 51 is rotatably connected with the back of the spray column 4, and one end of the support plate 43 is slidably connected with one of the third supporting rods 31.

[0041] The inner walls of the first supporting rod 3 and the second supporting rod 7 are slidably connected with extrusion rods 61 through ball heads, one end of each of the two extrusion rods 61 is fixedly connected with a first piston 62, the outer wall of each of the two first pistons 62 is slidably connected with a sleeve 63, and the outer wall of the sleeve 63 is fixedly connected with an oil delivery pipe 64.

[0042] The inner wall of the mounting seat 8 is provided with a containing cavity 71, the inner wall of the containing cavity 71 is slidably connected with a second piston 72, the second piston 72 is fixedly connected with one end of the extrusion seat 9, the oil delivery pipe 64 is in communication with the containing cavity 71, and the inside of the sleeve 63, the oil delivery pipe 64 and the containing cavity 71 is filled with hydraulic oil.

[0043] Working principle:

[0044] One, the center positioning and stable fixing mechanism of the equipment

[0045] After the equipment is hoisted to the area to be sprayed in the wind power tower, the first task is to realize the center positioning and stable fixing of the equipment in the tower, which is completed by the cooperation of multi-stage mechanical transmission and hydraulic auxiliary system.

[0046] Start the first motor 22, and the torque of the output end is directly transmitted to the worm 23, so that the worm rotates at a stable speed. Since the worm 23 and the worm gear 21 fixed at the bottom end of the first threaded rod 5 form a meshing transmission pair, the rotational motion of the worm is converted into the rotational motion of the worm gear, which in turn drives the first threaded rod 5 to rotate synchronously. The sliding ring 6 connected with the first threaded rod 5 through threads slides vertically downward along the outer wall of the fixed seat 1 under the action of thread friction.

[0047] The downward movement of the sliding ring 6 directly drives the synchronous downward movement of the second strut 7, which is equidistantly hinged at the bottom end of the sliding ring 6. At this time, the hinge point of the first strut 3 and the second strut 7 becomes the movement fulcrum. According to the principle of leverage, the downward movement of the second strut 7 gradually reduces the included angle of the two groups of struts, and the hinge point is horizontally stretched away from the center of the fixed base 1, driving the mounting base 8 and the extrusion base 9 to gradually approach the inner wall of the tower cylinder.

[0048] During the process of reducing the included angle of the first strut 3 and the second strut 7, the extrusion rods 61 connected by ball head sliding on the inner wall of the two struts are subjected to the extrusion action of the rod body, and move closer to each other along the axial direction. The end of the extrusion rod 61 pushes the first piston 62 to move in the sleeve 63, so that the hydraulic oil in the sleeve is pre-injected into the sleeve, the oil pipe and the containing cavity are subjected to extrusion, and the pressure is transmitted to the containing cavity 71 of the mounting base 8 along the oil pipe 64.

[0049] The second piston 72 in the containing cavity 71 pushes the extrusion base 9 to stretch out along the sliding rail of the mounting base 8 under the pressure of the hydraulic oil, until the extrusion base 9 tightly fits the inner wall of the tower cylinder. At the same time, the torsional spring at the hinge of the mounting base 8 and the first and second struts accumulates elastic potential energy during the stretching of the struts, and the reverse torque generated by the torsional spring always keeps the extrusion base 9 in pre-tightening force on the inner wall of the tower cylinder. Combined with the continuous pressure of the hydraulic system, it ensures that the device can still stably fit the inner wall in the area where the diameter of the tower cylinder changes slightly, and finally realizes the precise coincidence of the center of the device and the center of the tower cylinder, and forms a rigid fixation.

[0050] II. Distance adjustment and attitude control mechanism of the spray column

[0051] After the device is fixed, the distance between the spray column 4 and the inner wall needs to be adjusted according to the actual diameter of the inner wall of the tower cylinder to ensure the uniformity of the paint spraying. This process is realized by the transmission mechanism inside the rotating rod 2 and the parallelogram linkage structure.

[0052] Start the third motor 41, and the power at the output end directly drives the second threaded rod 42 to rotate inside the rotating rod 2. The support plate 43 connected with the second threaded rod 42 through threads slides up or down along the inner wall of the rotating rod 2 under the action of threaded transmission.

[0053] One end of the support plate 43 is slidingly connected with one side of the third strut 31 which is equidistantly hinged to the outer wall of the rotating rod 2. When the support plate 43 slides, it generates a pushing force or a pulling force on the third strut 31 along the contact surface. Since the two ends of the third strut 31 are respectively hinged to the rotating rod 2 and the back of the spray column 4, and each group of spray columns 4 corresponds to two third struts 31, a parallelogram structure is formed with the rotating rod 2 and the spray column 4 as opposite sides.

[0054] According to the geometric characteristics of parallelogram, the swing of the third strut 31 keeps the spray column 4 always parallel to the rotating rod 2, while making a translation movement towards or away from the inner wall of the tower drum. By controlling the forward and reverse rotation and running time of the third motor 41, the distance between the spray column 4 and the inner wall of the tower drum can be accurately adjusted to ensure that the spray head is in the best spraying radius position.

[0055] III. Power transmission and uniform coverage mechanism of rotary spraying

[0056] After the spray column position is adjusted, the second motor 31 is started, and the pinion 32 at the output end rotates at high speed. The power is transmitted to the rotating rod 2 through the gear reduction ratio between the pinion 32 and the gear 33 at the bottom end of the rotating rod 2, which can be designed according to the spraying speed requirement, so that the rotating rod rotates at a set angular velocity.

[0057] The rotation of the rotating rod 2 drives the spray columns 4 installed equidistantly on the outer wall to make a concentric circular motion. The spray heads arranged equidistantly on one side of the spray column 4 continuously spray paint during the rotation. Since the spray column 4 maintains a constant distance from the inner wall of the tower drum, and the center of rotation of the rotating rod 2 coincides with the center of the tower drum, the motion trajectory of the spray heads forms a series of concentric circular rings, and the coating coverage areas of adjacent circular rings overlap each other, finally forming a continuous and uniform coating on the inner wall of the tower drum.

[0058] It should be noted that the relational terms herein such as first and second, are used only to differentiate one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations exist in any actual relationship or order. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or equipment.

[0059] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wind turbine tower inner wall spraying equipment, characterized in that, include: A fixed base (1) is rotatably connected to the top of the fixed base (1), and a first support rod (3) is rotatably connected to the bottom of the fixed base (1). Spray columns (4) are installed at equal intervals on the outer wall of the rotating rod (2), and nozzles are installed at equal intervals on one side of the spray column (4). The first threaded rod (5) is rotatably connected to one side of the fixed seat (1). The outer wall of the fixed seat (1) is slidably connected to the sliding ring (6). The sliding ring (6) is threadedly connected to the first threaded rod (5). The bottom end of the sliding ring (6) is rotatably connected to the second support rod (7) at equal distances. A plurality of the first support rods (3) and a plurality of the second support rods (7) are hinged to one end. Mounting base (8), the first support rod (3) and the second support rod (7) are hinged to one end of the mounting base (8), and a pressing seat (9) is slidably mounted on one side of the mounting base (8).

2. The wind turbine tower inner wall spraying equipment according to claim 1, characterized in that: The bottom end of the first threaded rod (5) is fixedly connected to a worm gear (21), the bottom end of the fixed seat (1) is fixedly connected to a first motor (22), the output end of the first motor (22) is fixedly connected to a worm (23), and the worm (23) meshes with the worm gear (21).

3. The wind turbine tower inner wall spraying equipment according to claim 1, characterized in that: The top of the fixed base (1) is fixedly connected to the second motor (31), the output end of the second motor (31) is fixedly connected to the small gear (32), the bottom end of the rotating rod (2) is fixedly connected to the large gear (33), and the large gear (33) meshes with the small gear (32).

4. The wind turbine tower inner wall spraying equipment according to claim 1, characterized in that: A third motor (41) is fixedly connected to the top of the rotating rod (2), and a second threaded rod (42) is rotatably connected inside the rotating rod (2). The output end of the third motor (41) is fixedly connected to one end of the second threaded rod (42), and a support plate (43) is slidably connected inside the rotating rod (2). The support plate (43) is connected to the second threaded rod (42).

5. The wind turbine tower inner wall spraying equipment according to claim 4, characterized in that: Two third support rods (51) are equidistantly rotatably connected to the outer wall of the rotating rod (2). One end of the two third support rods (51) is rotatably connected to the back of the spray column (4). One end of the support plate (43) is slidably connected to one side of one of the third support rods (31).

6. The wind turbine tower inner wall spraying equipment according to claim 1, characterized in that: The inner walls of the first strut (3) and the second strut (7) are slidably connected to the extrusion rod (61) via ball joints. The two extrusion rods (61) are fixedly connected to the ends of each other. The outer walls of the two first pistons (62) are slidably connected to the sleeves (63). The outer walls of the sleeves (63) are symmetrically fixedly connected to the oil supply pipes (64).

7. The wind turbine tower inner wall spraying equipment according to claim 6, characterized in that: The mounting base (8) has an inner wall with a receiving cavity (71). A second piston (72) is slidably connected to the inner wall of the receiving cavity (71). The second piston (72) is fixedly connected to one end of the extrusion seat (9). The oil supply pipe (64) is connected to the receiving cavity (71).

8. The wind turbine tower inner wall spraying equipment according to claim 7, characterized in that: The sleeve (63), the oil pipe (64), and the receiving cavity (71) are filled with hydraulic oil.

9. The wind turbine tower inner wall spraying equipment according to claim 1, characterized in that: A torsion spring is installed at the connection between the mounting base (8) and the first support rod (3) and the second support rod (7).

10. A method for spraying the inner wall of a wind turbine tower, the method being applicable to the wind turbine tower inner wall spraying equipment according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Equipment hoisting and positioning: Hoist the entire spraying equipment to the spraying area inside the wind turbine tower, ensuring that the equipment is in a roughly centered position. At this time, the first support rod (3) and the second support rod (7) are in a retracted state so that the equipment can smoothly enter the tower. S2, Initial fixation of the drive strut: Start the first motor (22), the output end of the first motor (22) drives the worm (23) to rotate. Since the worm (23) is meshed with the worm wheel (21), the worm wheel (21) rotates with the worm (23) and drives the first threaded rod (5) to rotate. The sliding ring (6) threadedly connected to the first threaded rod (5) slides down along the outer wall of the fixed seat (1). The sliding ring (6) drives one end of the second strut (7) to descend, so that the hinge of the first strut (3) and the second strut (7) extends outward. The mounting seat (8) and the extrusion seat (9) gradually approach the inner wall of the tower and make initial contact. S3, Hydraulic Assisted Tight Fixing: During the unfolding process of the first support rod (3) and the second support rod (7), the angle between them gradually decreases, causing the inner wall extrusion rod (61) to move closer to each other. The extrusion rod (61) pushes the first piston (62) to slide in the sleeve (63). The hydraulic oil inside the sleeve (63) is pressed into the receiving cavity (71) of the mounting seat (8) through the oil supply pipe (64), pushing the second piston (72) and the extrusion seat (9) to extend further into the inner wall of the tower, so that the extrusion seat (9) tightly abuts against the inner wall of the tower. With the help of the torsion spring, the equipment is stably fixed in the tower. S4. Adjust the position of the spray column (4): Start the third motor (41), the third motor (41) drives the second threaded rod (42) to rotate, the support plate (43) threadedly connected to the second threaded rod (42) slides inside the rotating rod (2), one end of the support plate (43) slides with one side of the third support rod (31), driving the third support rod (31) to rotate along the outer wall of the rotating rod (2). Since the third support rod (31) is rotatably connected to the back of the spray column (4), under the action of the parallelogram structure, the spray column (4) is adjusted to a suitable spraying distance in the direction closer to the inner wall of the tower. S5. Rotary spraying operation: Start the second motor (31). The output end of the second motor (31) drives the small gear (32) to rotate. The small gear (32) meshes with the large gear (33) to drive the rotating rod (2) to rotate. The spray column (4) on the outer wall of the rotating rod (2) rotates synchronously with the rotating rod (2). The nozzle on one side of the spray column (4) starts to spray paint to uniformly spray the inner wall of the tower.

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