Box girder end chipping machine

Abstract

The application provides a box girder end chiseling machine, which comprises a fixing assembly, the fixing assembly comprises a machine body and a base, a chiseling assembly is installed on the machine body, the chiseling assembly comprises a sliding sleeve and a chisel head, a stabilizing driving assembly is installed on the inner side of the machine body, the stabilizing driving assembly comprises a motor and a crankshaft, a limiting assembly is installed on the sliding sleeve, the limiting assembly comprises a guide opening and a spring one, a preventing excessive impact force assembly is installed on the chisel head, the chiseling machine can effectively weaken the back impact force of the chisel head, avoid the machine body being pushed away from the box girder, improve the work efficiency, avoid the chisel head causing damage to the coarse aggregate, guarantee the structural safety of the box girder, avoid the waste of the energy of the chisel head, perform the cooling work, avoid the debris generated in the chiseling operation being driven to the inner side of the sliding sleeve by the chisel head, avoid the debris causing the abrasion of the equipment, thereby guaranteeing the service life of the equipment, and the chiseling machine is suitable for the chiseling work of the box girder end.

Description

Technical Field

[0001] This invention relates to the technical field of box girder end roughening equipment, specifically a box girder end roughening machine. Background Technology

[0002] During bridge construction, to ensure the secure installation of precast main beam components, the ends of the precast box girders need to be roughened to expose the aggregate, thereby increasing the bonding strength of the concrete between adjacent beam segments. Patent application CN201510813489.9 discloses an onboard roughening machine and a method for roughening concrete surfaces. This onboard roughening machine has a simple structure, improved from a common hand-push roughening machine. Based on the main body of the roughening machine, it adds a fixing mechanism that enables roughening... The machine features a directional movement track for the chiseling machine body and a lifting support device to provide gravity support for the track and body. It is low-cost and easy to use. Simply align the chiseling machine track with the work surface, ensuring the chiseling head corresponds to the surface. Operation is simple; just start the motor and chiseling head drive device, and the chiseling head will chisel under power. It is easy to operate, highly efficient, causes no damage to the substrate, and produces good chiseling quality. It can chisel both the top and sides. Suitable for construction environments with limited space, it has a wide range of applications and good construction safety. According to its publicly available technical solutions, existing box girder end chiseling equipment has several drawbacks. First, the reaction force exerted by the chisel on the box girder during chiseling can cause the equipment to be unstable, leading to loosening of the support components behind the equipment and causing it to move backward. This requires repeated relocation and fixation by personnel, reducing work efficiency. Second, during chiseling, excessive impact force from the chisel can damage the aggregate inside the box girder, compromising its safety. Furthermore, if the chiseling depth is too large, some chisels may not be able to contact the box girder, resulting in wasted energy. Third, the reciprocating motion of the chisel and connecting mechanism within the sliding sleeve during chiseling generates a lot of heat, which can lead to a decrease in equipment strength due to increased temperature. Additionally, the debris generated during chiseling can be carried by the chisel to the inside of the sliding sleeve, accelerating wear and reducing the equipment's service life. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a box girder end roughening machine to solve the problems mentioned in the background art. The present invention has a novel structure, multiple functions, and is suitable for roughening work at the ends of box girders.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a box girder end chiseling machine, comprising a fixing component, the fixing component including a machine body and a base, a lifting component installed at the bottom of the machine body, the lifting component including a hydraulic rod one and a hydraulic rod two, a chiseling component installed on the machine body, the chiseling component including a sliding sleeve and a chisel head, a stabilizing drive component installed on the inner side of the machine body, the stabilizing drive component including a motor and a crankshaft, a limiting component installed on the sliding sleeve, the limiting component including a guide and a spring one, and an anti-excessive impact component installed on the chisel head, the anti-excessive impact component including a sliding plate one and a spring two.

[0005] Furthermore, the top end of the first hydraulic rod is bolted to the bottom of the machine body, the bottom end of the first hydraulic rod is bolted to the top of the base, the top end of the second hydraulic rod is bolted to the bottom of the machine body, and the bottom end of the second hydraulic rod extends to the outside of the base.

[0006] Furthermore, the motor is bolted to the outer side of the machine body, the crankshaft is mounted on the inner side of the machine body, and one end of the crankshaft passes through the machine body and is mounted on the output shaft of the motor via a coupling.

[0007] Furthermore, the sliding sleeve is welded to one side of the machine body, the sliding sleeve is evenly distributed on the machine body, one end of the sliding sleeve is connected to the inner side of the machine body, and a piston is engaged on the inner side of the sliding sleeve.

[0008] Furthermore, a guide rod is installed on the inner side of the machine body. One end of the guide rod is mounted on the crankshaft via a bearing, and the other end of the guide rod is mounted on one side of the piston via a rotating shaft. The piston has air holes that are evenly distributed on the inner side of the piston.

[0009] Furthermore, the guide opening is located on the inner side of the other end of the sliding sleeve, the spring is welded to the inner wall of the guide opening, the inner diameter of the guide opening is equal to the diameter of the chisel, and a sliding plate is welded to the other side of the piston.

[0010] Furthermore, one end of the second spring is secured to the chisel head, and the other end of the second spring is secured to the other side of the piston. The first sliding plate is evenly distributed on the chisel head, and the second sliding plate is secured in the gap of the first sliding plate. The first and second sliding plates are alternately spliced ​​together to form an annular barrel-shaped structure, and the outer diameter of the annular barrel-shaped structure is equal to the diameter of the chisel head.

[0011] Furthermore, both sides of the first slide plate are provided with slide grooves, and both sides of one end of the second slide plate are bolted with sliders. The outer side of the slider is stuck on the inner wall of the slide groove, and a one-way valve is installed on the slider.

[0012] Furthermore, a fan duct is welded to one side of the machine body, and a bracket is welded to the inner side of the fan duct. The brackets are evenly distributed on the inner side of the fan duct, and the other end of the crankshaft is mounted on the bracket via a bearing.

[0013] Furthermore, a filter screen is welded to the inner side of the air duct, and the filter screen is bolted to the bracket and the inner wall of the air duct respectively. A fan blade is bolted to the other end of the crankshaft and is installed on the inner side of the air duct. A controller is bolted to the base and is connected to hydraulic rod one, hydraulic rod two and motor via wires.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. When the box girder end roughening machine roughens the end of a box girder, the base is installed at the bottom of the box girder end. The top of the machine body is adjusted by hydraulic rod one and hydraulic rod two, so that the chisel head is locked on the outer side of the box girder end. The motor drives the crankshaft to rotate, and the crankshaft drives multiple guide rods through bearings. The guide rods drive the piston to move back and forth inside the sliding sleeve, which in turn causes the piston to drive the chisel head to move back and forth under the limit of the guide opening through spring two, performing hammer chiseling work on the end of the box girder, removing all the laitance on the concrete surface of the end section. The process involves chiseling away the material to ensure that the exposed portion is fresh coarse aggregate. Multiple chisels work alternately, moving in opposite directions to effectively reduce the backward recoil force exerted on the machine body by the chisels after receiving a reaction force. This allows the hydraulic rods to effectively support the machine body, while the second spring and the second hydraulic rod provide cushioning against larger impacts, preventing the machine body from being pushed away from the box girder. This ensures that subsequent roughening work can proceed without the need for constant relocation and reinforcement, thus improving work efficiency.

[0016] 2. When the chisel head of this box girder end roughening machine impacts the coarse aggregate, preventing its removal, the chisel head compresses spring two, causing slide plate one to move towards the gap between slide plate two. This effectively prevents the chisel head from damaging the coarse aggregate, ensuring the structural safety of the box girder. When a large amount of roughened material is removed, making it impossible for some chisels to reach the box girder, the piston is pushed near the guide opening. Spring one then compresses the piston, which springs back using the spring force. This causes the piston to drive the crankshaft to rotate via the guide rod and bearing, assisting the other chisels in their work and effectively preventing damage to the coarse aggregate. The energy wasted in this chisel head is due to the fact that when the chisel head is working, it compresses the second spring due to the large resistance of the box beam. When the crankshaft drives the piston to move inward through the guide rod, the second spring extends. The slider on the second slide plate moves inward through the groove in the first slide plate. The sealing of the slider in the groove prevents the air in the groove from being discharged quickly, thus effectively avoiding a large impact between the slider and the groove and ensuring the safety of the slider. At the same time, the limiting of the groove by the slide plate ensures that the second spring has a certain elasticity in the initial state, thus ensuring the chisel head's chiseling work.

[0017] 3. When the crankshaft of the box girder end chiseling machine rotates, the crankshaft drives the fan blades to rotate. The fan blades draw in dust-free air through the filter screen. After the air enters the inner side of the machine body, it flows through the air holes on the piston to the inner side of the sliding sleeve, and then flows through the gap between the first and second sliding plates to the chisel head. This effectively cools the transmission mechanism and the reciprocating moving parts in the sliding sleeve, ensuring the working strength of the components inside the equipment. At the same time, the air at the guide port generates an outward blowing force on the chisel head, preventing the chips generated during the chiseling operation from being carried to the inner side of the sliding sleeve by the chisel head, thus avoiding wear caused by the chips and ensuring the service life of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a box girder end roughening machine according to the present invention;

[0019] Figure 2 This is a top sectional view of a box girder end roughening machine according to the present invention;

[0020] Figure 3 This is a schematic diagram of the chisel head of a box girder end roughening machine according to the present invention;

[0021] Figure 4 This is a cross-sectional view of the sliding plate of a box girder end roughening machine according to the present invention.

[0022] Figure 5 This is a side sectional view of the ventilation duct of a box girder end roughening machine according to the present invention.

[0023] In the diagram: 1. Body; 2. Base; 3. Hydraulic rod one; 4. Hydraulic rod two; 5. Motor; 6. Crankshaft; 7. Sliding sleeve; 8. Chisel head; 9. Guide rod; 10. Bearing; 11. Piston; 12. Air hole; 13. Guide port; 14. Spring one; 15. Slide plate one; 16. Slide plate two; 17. Spring two; 18. Slide groove; 19. Slider; 20. One-way valve; 21. Air duct; 22. Bracket; 23. Filter screen; 24. Fan blade; 25. Controller. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0025] Please see Figures 1 to 5This invention provides a technical solution: a box girder end chiseling machine, comprising a fixing assembly, the fixing assembly including a machine body 1 and a base 2, a lifting assembly installed at the bottom of the machine body 1, the lifting assembly including a hydraulic rod 3 and a hydraulic rod 4, a chiseling assembly installed on the machine body 1, the chiseling assembly including a sliding sleeve 7 and a chisel head 8, a stabilizing drive assembly installed on the inner side of the machine body 1, the stabilizing drive assembly including a motor 5 and a crankshaft 6, a limiting assembly installed on the sliding sleeve 7, the limiting assembly including a guide 13 and a spring 14, an anti-excessive impact assembly installed on the chisel head 8, the anti-excessive impact assembly including a sliding plate 15 and a spring 17, and the top end of the hydraulic rod 3 being bolted to the machine body. At the bottom of body 1, the bottom of hydraulic rod 3 is bolted to the top of base 2, and the top of hydraulic rod 4 is bolted to the bottom of body 1. The bottom end of hydraulic rod 4 extends to the outside of base 2. Motor 5 is bolted to the outer side of body 1. Crankshaft 6 is installed on the inner side of body 1, with one end passing through body 1 and mounted on the output shaft of motor 5 via a coupling. Sliding sleeves 7 are welded to one side of body 1 and are evenly distributed on body 1. One end of each sliding sleeve 7 communicates with the inner side of body 1, and a piston 11 is held inside the sliding sleeve 7. Guide rods 9 are installed on the inner side of body 1, with one end of guide rod 9 mounted on crankshaft 6 via bearing 10. The other end of the guide rod 9 is mounted on one side of the piston 11 via a rotating shaft. The piston 11 has air holes 12 evenly distributed on its inner side. A guide opening 13 is located on the inner side of the other end of the sliding sleeve 7. A spring 14 is welded to the inner wall of the guide opening 13. The inner diameter of the guide opening 13 is equal to the diameter of the chisel head 8. A sliding plate 16 is welded to the other side of the piston 11. During operation, when a large amount of rough material is removed, making it impossible for some chisels 8 to reach the box girder, the piston 11 is pushed closer to the guide opening 13. The spring 14 then compresses the piston 11, causing it to spring back using the spring force. This allows the piston 11 to drive the crankshaft 6 to rotate via the guide rod 9 and bearing 10, thus facilitating the rotation of the other parts of the shaft. The chisel head 8 operates with assistance, effectively avoiding energy waste. When the chisel head 8 is working, it compresses the second spring 17 due to the large resistance of the box beam. When the crankshaft 6 drives the piston 11 to move inward to the sliding sleeve 7 via the guide rod 9, the second spring 17 extends. The slider 19 on the sliding plate 16 moves inward to the inside of the groove 18 in the sliding plate 15. The sealing of the slider 19 in the groove 18 prevents the air in the groove 18 from being discharged quickly, thus effectively preventing the slider 19 from having a large impact on the groove 18 and ensuring the safety of the slider 19. At the same time, the limiting of the groove 18 by the slider 19 ensures that the second spring 17 has a certain elasticity in the initial state, thus ensuring the chisel head 8's chiseling work.

[0026] In this embodiment, one end of the second spring 17 is secured to the chisel head 8, and the other end of the second spring 17 is secured to the other side of the piston 11. The first sliding plate 15 is evenly distributed on the chisel head 8, and the second sliding plate 16 is secured in the gaps between the first sliding plate 15. The first sliding plate 15 and the second sliding plate 16 are alternately spliced ​​to form an annular barrel-shaped structure. The outer diameter of the annular barrel-shaped structure is equal to the diameter of the chisel head 8. Sliding grooves 18 are provided on both sides of the first sliding plate 15, and sliding plates 16 are bolted to both sides of one end of the second sliding plate 16. Block 19, the outer side of the slider 19 is locked onto the inner wall of the slide groove 18, and a one-way valve 20 is installed on the slider 19. When roughening the end of the box girder, the base 2 is installed at the bottom of the end of the box girder. The top of the machine body is adjusted by hydraulic rod 3 and hydraulic rod 4, so that the chisel 8 is locked onto the outer side of the end of the box girder. The motor 5 drives the crankshaft 6 to rotate. The crankshaft 6 drives multiple guide rods 9 through the bearing 10. The guide rods 9 drive the piston 11 to move back and forth inside the sliding sleeve 7, thereby making... Piston 11 drives chisel 8 to move back and forth under the limit of guide port 13 via spring 2 17, performing hammer chiseling work on the end of box girder, removing all the laitance on the concrete surface of the end section, ensuring that the exposed part is fresh coarse aggregate. When chisel 8 hits the coarse aggregate, it cannot be removed, which causes chisel 8 to compress spring 2 17 and move slide plate 15 to the gap of slide plate 2 16, effectively preventing chisel 8 from damaging the coarse aggregate and ensuring the structural safety of box girder. At the same time, multiple chisels 8 work alternately, and the chisels 8 move in opposite directions, which effectively weakens the backward recoil force of chisel 8 on machine body 1 after being subjected to reaction force. In this way, hydraulic rod 2 4 can be used to effectively support the machine body 1. At the same time, spring 2 17 and hydraulic rod 2 4 are used to buffer the impact force, effectively preventing the machine body 1 from being pushed away from the box girder, ensuring the subsequent roughening work. No need for personnel to move and reinforce, improving work efficiency.

[0027] In this embodiment, a fan duct 21 is welded to one side of the machine body 1, and a support 22 is welded to the inner side of the fan duct 21. The support 22 is evenly distributed on the inner side of the fan duct 21. The other end of the crankshaft 6 is mounted on the support 22 via a bearing 10. A filter screen 23 is welded to the inner side of the fan duct 21, and the filter screen 23 is bolted to the inner walls of the support 22 and the fan duct 21 respectively. A fan blade 24 is bolted to the other end of the crankshaft 6, and the fan blade 24 is mounted on the inner side of the fan duct 21. A controller 25 is bolted to the base 2, and the controller 25 is connected to the first hydraulic rod 3, the second hydraulic rod 4, and the motor 5 via wires. When the crankshaft 6 rotates... When in operation, the crankshaft 6 drives the fan blades 24 to rotate. The fan blades 24 draw in dust-free air through the filter screen 23. After the air enters the inner side of the machine body 1, it flows through the air hole 12 on the piston 11 to the inner side of the sliding sleeve 7, and then flows through the gap between the sliding plate 15 and the sliding plate 2 16 to the chisel head 8. This effectively cools down the transmission mechanism inside the machine body 1 and the reciprocating moving parts inside the sliding sleeve 7, ensuring the working strength of the parts inside the equipment. At the same time, the air generates an outward blowing force on the chisel head 8 at the guide port 13, preventing the chips generated during the chiseling operation from being carried by the chisel head 8 to the inner side of the sliding sleeve 7, avoiding wear caused by the chips, and thus ensuring the working life of the equipment.

[0028] This box girder end chiseling machine is powered by an external power supply. When chiseling the end of the box girder, the base 2 is installed at the bottom of the end. The top of the machine is adjusted using hydraulic rods 3 and 4, causing the chisel head 8 to be secured to the outer side of the box girder end. The motor 5 drives the crankshaft 6 to rotate. The crankshaft 6 drives multiple guide rods 9 via bearings 10. The guide rods 9 drive the piston 11 to move back and forth inside the sliding sleeve 7. This causes the piston 11 to move the chisel head 8 back and forth within the guide opening 13 via spring 17, performing hammer chiseling work on the end of the box girder. This removes all the surface laitance from the concrete at the end section, ensuring that the exposed portion is fresh coarse aggregate. When the chisel head 8 strikes the coarse aggregate, it... The inability to remove the coarse aggregate causes the chisel head 8 to compress the second spring 17, and the sliding plate 15 to move into the gap of the second sliding plate 16. This effectively prevents the chisel head 8 from damaging the coarse aggregate, ensuring the structural safety of the box girder. Simultaneously, multiple chisels 8 work alternately, causing them to move in opposite directions. This effectively weakens the backward recoil force exerted on the machine body 1 by the chisel head 8 after being subjected to reaction force. This allows the hydraulic rod 24 to effectively support the machine body 1. Furthermore, the spring 27 and hydraulic rod 24 provide cushioning under significant impact forces, effectively preventing the machine body 1 from being pushed away from the box girder. This ensures subsequent roughening work without requiring constant movement and reinforcement by personnel, improving work efficiency. When the rough aggregate removed is relatively large... When there are too many chisels, making it impossible for some chisels 8 to reach the box girder, the piston 11 is pushed close to the guide port 13. The spring 14 then compresses the piston 11, which springs back using the spring force of the spring 14. This causes the piston 11 to drive the crankshaft 6 to rotate via the guide rod 9 and bearing 10, providing assistance to the other chisels 8 and effectively avoiding energy waste at this point. When the chisels 8 are working and experience significant resistance from the box girder, causing the compression spring 17 to move, the crankshaft 6, via the guide rod 9, drives the piston 11 to move inwards towards the sliding sleeve 7. This causes the spring 17 to extend, and the slider 19 on the sliding plate 16 moves inside the groove 18 within the sliding plate 15. The sealing of the slider 19 within the groove 18 allows the groove 18 to... The air cannot be quickly expelled, thus effectively preventing the slider 19 from causing a large impact on the slide groove 18, ensuring the safety of the slider 19. At the same time, the slider 19 limits the slide groove 18, so that the second spring 17 has a certain elastic force in the initial state, thus ensuring the chisel head 8's chiseling work. When the crankshaft 6 rotates, the crankshaft 6 drives the fan blade 24 to rotate. The fan blade 24 draws in dust-free air through the filter screen 23. After the air enters the inside of the machine body 1, it flows through the air hole 12 on the piston 11 to the inside of the slide sleeve 7, and then flows through the gap between the first slide plate 15 and the second slide plate 16 to the chisel head 8. This effectively cools down the transmission mechanism inside the machine body 1 and the reciprocating moving parts inside the slide sleeve 7, ensuring the working strength of the components inside the equipment.Simultaneously, air at the guide port 13 generates an outward blowing force on the chisel head 8, preventing debris generated during the chiseling operation from being carried by the chisel head 8 to the inside of the sliding sleeve 7, thus avoiding wear on the equipment and ensuring its service life.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A box girder end chiseling machine, comprising a fixing assembly, the fixing assembly comprising a machine body (1) and a base (2), a lifting assembly mounted on the bottom of the machine body (1), the lifting assembly comprising a hydraulic rod one (3) and a hydraulic rod two (4), a chiseling assembly mounted on the machine body (1), the chiseling assembly comprising a sliding sleeve (7) and a chisel head (8), characterized in that: The inner side of the body (1) is equipped with a stabilizing drive assembly, which includes a motor (5) and a crankshaft (6). A limiting assembly is installed on the sliding sleeve (7), which includes a guide (13) and a spring (14). An anti-excessive impact assembly is installed on the chisel (8), which includes a sliding plate (15) and a spring (17). The top end of the first hydraulic rod (3) is bolted to the bottom of the body (1), the bottom end of the first hydraulic rod (3) is bolted to the top of the base (2), the top end of the second hydraulic rod (4) is bolted to the bottom of the body (1), and the bottom end of the second hydraulic rod (4) extends to the outside of the base (2). The motor (5) is bolted to the outer side of the machine body (1), and the crankshaft (6) is mounted on the inner side of the machine body (1). One end of the crankshaft (6) passes through the machine body (1) and is mounted on the output shaft of the motor (5) through a coupling. The sliding sleeve (7) is welded to one side of the body (1). The sliding sleeve (7) is evenly distributed on the body (1). One end of the sliding sleeve (7) is connected to the inner side of the body (1). A piston (11) is clamped on the inner side of the sliding sleeve (7). A guide rod (9) is installed on the inner side of the body (1). One end of the guide rod (9) is mounted on the crankshaft (6) through a bearing (10), and the other end of the guide rod (9) is mounted on one side of the piston (11) through a rotating shaft. The piston (11) is provided with air holes (12), and the air holes (12) are evenly distributed on the inner side of the piston (11). The guide (13) is opened on the inner side of the other end of the sliding sleeve (7), the spring one (14) is welded to the inner wall of the guide (13), the inner diameter of the guide (13) is equal to the diameter of the chisel (8), and the other side of the piston (11) is welded with the sliding plate two (16). One end of the second spring (17) is stuck on the chisel head (8), and the other end of the second spring (17) is stuck on the other side of the piston (11). The first slide plate (15) is evenly distributed on the chisel head (8), and the second slide plate (16) is stuck in the gap of the first slide plate (15). The first slide plate (15) and the second slide plate (16) are alternately spliced ​​into an annular barrel structure. The outer diameter of the annular barrel structure is equal to the diameter of the chisel head (8). The first slide plate (15) has a slide groove (18) on both sides. The second slide plate (16) has a slider (19) installed on both sides of one end by bolts. The outer side of the slider (19) is stuck on the inner wall of the slide groove (18). A one-way valve (20) is installed on the slider (19).

2. The box girder end roughening machine according to claim 1, characterized in that: A fan duct (21) is welded to one side of the body (1), and a bracket (22) is welded to the inner side of the fan duct (21). The brackets (22) are evenly distributed on the inner side of the fan duct (21), and the other end of the crankshaft (6) is mounted on the bracket (22) through a bearing (10).

3. The box girder end roughening machine according to claim 2, characterized in that: A filter screen (23) is welded to the inner side of the air duct (21). The filter screen (23) is installed on the inner wall of the bracket (22) and the air duct (21) by bolts. A fan blade (24) is installed on the other end of the crankshaft (6) by bolts. The fan blade (24) is installed on the inner side of the air duct (21). A controller (25) is installed on the base (2) by bolts. The controller (25) is connected to the hydraulic rod one (3), the hydraulic rod two (4) and the motor (5) by wires.

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