A steel bar production line surface spraying device
By combining the design of the fixing frame, fixing components, spraying mechanism and driving mechanism, the problem of uneven spraying on the surface of the steel bar is solved, and a uniform spraying effect is achieved on the surface of the steel bar.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI YICHANG WEAR RESISTANT MATERIAL CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-08-04
AI Technical Summary
In existing steel bar surface spraying devices, the rotation and horizontal movement of the steel bar are driven by two motors, which leads to a mismatch between the rotation speed and the conveying speed, resulting in uneven spraying and problems such as local coatings being too thick or too thin.
The design employs a combination of a fixed frame, fixed components, a spraying mechanism, and a drive mechanism. A motor drives the steel rod to rotate and moves the spray head. By utilizing the difference in teeth between the large and small gears, the rotation speed of the steel rod is ensured to be relatively fast. The spray head is then moved after uniform spraying, achieving uniform coating on the surface of the steel rod.
This method achieves uniform coating on the surface of the steel bar, avoiding the problem of excessively thick or thin coatings in certain areas, and improving the coating effect.
Smart Images
Figure CN224586154U_ABST
Abstract
Description
Technical Field
[0001] The embodiments disclosed herein relate to the field of spraying apparatus technology, and more specifically, to a surface spraying apparatus for a steel bar production line. Background Technology
[0002] Prestressed concrete steel bars, or simply steel bars, are a type of prestressed steel with high technical content. Due to their high strength and toughness, low relaxation, strong bond with concrete, good weldability, forging properties, and material saving characteristics, they have been widely used abroad in high-strength prestressed concrete centrifugal pipe piles, utility poles, viaduct piers, railway sleepers, and other prestressed components. During the production process of steel bars, a steel bar surface spraying device is required to spray a wear-resistant coating onto the outer surface of the steel bars. The existing steel bar surface spraying equipment generally works by rotating the fixed steel bar at a constant speed under a rotary drive, while simultaneously driving the steel bar to move and pass through a surrounding spray nozzle to complete the surface spraying. However, the rotation and horizontal movement of the steel bar are driven by two separate motors. The rotation speed of the steel bar may not match the conveying speed (e.g., too slow rotation speed, too long local spraying time), which will result in the coating on the steel bar surface being too thick (sagging, accumulation) or too thin (exposing the substrate), resulting in poor spraying effect. Utility Model Content
[0003] To overcome the above-mentioned defects, embodiments of this disclosure provide a surface spraying device for a steel bar production line, which solves the technical problems of uneven coating and poor spraying effect on the surface of steel bars in the prior art.
[0004] According to one aspect, at least one embodiment of this disclosure provides a surface coating device for a steel bar production line, including a base and a steel bar, and further including a fixing frame, a fixing component, a coating mechanism, and a driving mechanism. The fixing frame is fixedly connected to the base, and the fixing frame has a placement hole and a through hole that cooperate with the steel bar. The inner walls of the placement hole and the through hole are rotatably engaged with the steel bar. The fixing component is rotatably disposed on the fixing frame for fixing one end of the steel bar. The coating mechanism is disposed on the base for spraying a coating onto the steel bar. The driving mechanism is disposed on the fixing frame for driving the steel bar to rotate, and simultaneously driving the coating mechanism to move above the steel bar along the axis of the steel bar and uniformly spray the surface of the steel bar.
[0005] In order to fix the steel bar in the through hole, the fixing assembly includes a rotating ring, a connecting plate and a clamping member. The fixing frame has a rotating groove that cooperates with the rotating ring. The rotating ring is rotatably disposed in the fixing frame. One end of the connecting plate is fixedly connected to one end of the rotating ring, and the other end passes through the fixing frame and extends outward. The clamping member is disposed at one end of the connecting plate and is used to fix the steel bar.
[0006] To clamp and fix the steel bar, the clamping member includes a first clamping plate, a second clamping plate, a fixing plate, and bolts. One end of the first clamping plate is fixedly connected to the other end of the connecting plate. The second clamping plate is hinged to the first clamping plate via a hinge. The first clamping plate and the second clamping plate form a clamping space and cooperate with the steel bar. One end of both the first clamping plate and the second clamping plate is fixedly connected to the fixing plate. Both fixing plates are threadedly engaged with the bolts.
[0007] In order to apply a coating to the surface of the steel bar, the spraying mechanism includes a storage tank, a water pump, a water outlet pipe, and a spraying component. The storage tank is mounted on the base. The input end of the water pump is connected to the storage tank through a water inlet pipe. One end of the water outlet pipe is connected to the water pump. The spraying component is movably disposed at one end of the water outlet pipe for spraying the coating onto the surface of the steel bar.
[0008] In order to uniformly spray the surface of the steel bar, the spraying component includes a telescopic pipe, a connecting pipe, an arc-shaped pipe, and spray nozzles. One end of the telescopic pipe is connected to the water outlet pipe, one end of the connecting pipe is connected to the other end of the telescopic pipe, the arc-shaped pipe is located above the steel bar, the middle part of the arc-shaped pipe is connected to the other end of the connecting pipe, and multiple spray nozzles are evenly distributed on the arc-shaped pipe.
[0009] To drive the threaded rod to rotate while simultaneously rotating the steel bar, the driving mechanism includes a threaded rod, a movable plate, a first rotating shaft, a motor, and a connecting piece. A movable slot is provided within the fixed frame, and the threaded rod is rotatably disposed within this slot. One end of the movable plate is threadedly engaged with the threaded rod, and the other end of the movable plate is fixedly connected to the connecting pipe. A cavity is provided within the fixed frame, and the first rotating shaft is rotatably disposed within this cavity. One end of the first rotating shaft is coaxially and fixedly connected to one end of the threaded rod. The motor is mounted on the fixed frame, and its output end is coaxially and fixedly connected to one end of the first rotating shaft. The connecting piece is disposed within the fixed frame and is used to connect the first rotating shaft and the rotating ring.
[0010] In order for the motor to drive the steel bar to rotate, the connecting member includes a large gear and a small gear. The large gear is mounted on the first rotating shaft and is coaxially and fixedly connected to the first rotating shaft. The small gear is mounted on the rotating ring and is coaxially and fixedly connected to the rotating ring. The small gear and the large gear mesh.
[0011] In order for the connecting plate to rotate in a circle around the axis of the through hole and drive the steel rod to rotate, both ends of the connecting plate are arc-shaped, and the fixing frame is provided with a slot that matches the connecting plate.
[0012] In order to allow the rotating ring to rotate within the rotating groove and to prevent the rotating ring from detaching from the rotating groove, the through hole, the slot, and the rotating groove are all coaxially fixedly connected and their cross-sectional areas increase sequentially.
[0013] In order to support the telescopic pipe to remain parallel to the steel rod, both the water outlet pipe and the connecting pipe are S-shaped, and the telescopic pipe is parallel to the steel rod.
[0014] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, by cooperating with the fixing frame, fixing components, spraying mechanism and driving mechanism, one end of the steel rod is inserted through the through hole and into the placement hole, so that the steel rod can be kept horizontal. By rotating the second clamping plate, the two fixing plates are brought into contact. The two fixing plates are fixed with bolts. The steel rod is fixed by the clamping and fixing of the two clamping plates, so as to prevent it from moving out of the placement hole. By simultaneously starting the water pump and motor, the water pump transfers the liquid in the storage tank to multiple nozzles and sprays it onto the surface of the steel rod. At the same time, starting the motor drives multiple nozzles to move horizontally and spray the steel rod surface, while simultaneously driving the fixed steel rod to rotate. Since the large gear has more teeth than the small gear, the small gear drives the steel rod to rotate at a faster speed. Multiple nozzles can spray the steel rod surface evenly before moving, thus ensuring uniform spraying of the steel rod surface. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.
[0016] Figure 1 This is a schematic diagram of the overall structure in one embodiment of the present disclosure; Figure 2 This is a partial structural cross-sectional view of the whole in one embodiment of this disclosure; Figure 3 This is a partial structural cross-sectional view of the steel bar, moving plate, fixing assembly and spraying mechanism in one embodiment of the present disclosure; Figure 4 This is a schematic diagram of the structure of the steel bar, swivel ring, connecting plate and fixing assembly in one embodiment of the present disclosure; Figure 5 This is a partial structural cross-sectional view of the fixing frame in one embodiment of this disclosure; Figure 6 This is a partial structural cross-sectional view of the through hole in the fixing frame in one embodiment of the present disclosure; Figure 7 This is a schematic diagram of the structure of the base and the fixing frame in one embodiment of the present disclosure.
[0017] In the diagram: 1. Base; 2. Steel rod; 3. Fixing frame; 4. Placement hole; 5. Through hole; 6. Rotary ring; 7. Rotary groove; 8. Connecting plate; 9. First clamping plate; 10. Second clamping plate; 11. Fixing plate; 12. Bolt; 13. Liquid storage tank; 14. Water pump; 15. Inlet pipe; 16. Outlet pipe; 17. Telescopic pipe; 18. Connecting pipe; 19. Arc-shaped pipe; 20. Nozzle; 21. Threaded rod; 22. Moving plate; 23. First rotating shaft; 24. Cavity; 25. Motor; 26. Large gear; 27. Small gear; 28. Groove; 29. Moving groove. Detailed Implementation
[0018] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.
[0019] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."
[0020] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.
[0021] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0022] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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 disclosure.
[0023] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0024] like Figures 1-7 As shown, it illustrates a surface spraying device for a steel bar 2 production line according to an embodiment of the present disclosure, including a base 1 and a steel bar 2, and also including a fixing frame 3, a fixing component, a spraying mechanism and a driving mechanism. The fixing frame 3 is fixedly connected to the base 1. The fixing frame 3 is a U-shaped frame. The fixing frame 3 has a placement hole 4 and a through hole 5 that cooperate with the steel bar 2. The axes of the placement hole 4 and the through hole 5 coincide. The inner walls of the placement hole 4 and the through hole 5 are rotatably engaged with the steel bar 2. By passing one end of the steel bar 2 through the through hole 5 and inserting it into the placement hole 4, the steel bar 2 can be kept horizontal. like Figure 3 and Figure 4 As shown, the fixing component is rotatably mounted on the fixing frame 3 to fix one end of the steel rod 2. In order to fix the steel rod 2 in the through hole 5, the fixing component includes a rotating ring 6, a connecting plate 8, and a clamping member. The fixing frame 3 has a rotating groove 7 that cooperates with the rotating ring 6. The rotating groove 7 is an annular groove. The rotating ring 6 is rotatably mounted in the fixing frame 3. One end of the connecting plate 8 is fixedly connected to one end of the rotating ring 6, and the other end passes through the fixing frame 3 and extends. The clamping member is set at one end of the connecting plate 8 to fix the steel rod 2. In order to make the connecting plate 8 rotate in a circle about the axis of the through hole 5 and drive the steel rod 2 to rotate, both ends of the connecting plate 8 are arc-shaped. The fixing frame 3 has a slot 28 that cooperates with the connecting plate 8. In order to make the rotating ring 6 rotate in the rotating groove 7 and prevent the rotating ring 6 from detaching from the rotating groove 7, the through hole 5, the slot 28, and the rotating groove 7 are all coaxially fixedly connected and their cross-sectional areas increase sequentially, so that the rotating ring 6 can remain "stable" and is rotatably mounted in the rotating groove 7 to prevent the rotating ring 6 from being displaced. In order to clamp and fix the steel rod 2, the clamping components include a first clamping plate 9, a second clamping plate 10, a fixing plate 11, and a bolt 12. One end of the first clamping plate 9 is fixedly connected to the other end of the connecting plate 8. The second clamping plate 10 is hinged to the first clamping plate 9 through a hinge. The first clamping plate 9 and the second clamping plate 10 form a clamping space and cooperate with the steel rod 2. One end of the first clamping plate 9 and the second clamping plate 10 is fixedly connected to a fixing plate 11. Both fixing plates 11 are threadedly engaged with the bolt 12. After the steel rod 2 is placed in the placement hole 4 and the through hole 5, the two fixing plates 11 are abutted by rotating the second clamping plate 10. The two fixing plates 11 are then fixed by the bolt 12. The steel rod 2 is fixed by the clamping and fixing of the two clamping plates to prevent it from moving out of the placement hole 4. like Figure 1 , Figure 2 and Figure 3 As shown, the spraying mechanism is mounted on the base 1 and is used to spray a coating onto the steel bar 2. To ensure the coating is applied to the surface of the steel bar 2, the spraying mechanism includes a storage tank 13, a water pump 14, an outlet pipe 16, and a spray nozzle. The storage tank 13 is mounted on the base 1. The input end of the water pump 14 is connected to the storage tank 13 via an inlet pipe 15. One end of the outlet pipe 16 is connected to the water pump 14. The spray nozzle is movably mounted at one end of the outlet pipe 16 and is used to spray the coating onto the surface of the steel bar 2. To ensure uniform coating on the surface of the steel bar 2, the spray nozzle includes a telescopic pipe 17, a connecting pipe 18, an arc-shaped pipe 19, and a nozzle 20. One end of the telescopic pipe 17... The water outlet pipe 16 is connected to the water outlet pipe 16, and one end of the connecting pipe 18 is connected to the other end of the telescopic pipe 17. In order to support the telescopic pipe 17 to remain parallel to the steel rod 2, both the water outlet pipe 16 and the connecting pipe 18 are S-shaped. The telescopic pipe 17 is parallel to the steel rod 2, and the arc-shaped pipe 19 is located above the steel rod 2. The middle part of the arc-shaped pipe 19 is connected to the other end of the connecting pipe 18. Multiple nozzles 20 are evenly distributed on the arc-shaped pipe 19. By starting the water pump 14, the water pump 14 draws out the liquid in the storage tank 13 and reaches the multiple nozzles 20 through the water outlet pipe 16, the telescopic pipe 17, the connecting pipe 18 and the arc-shaped pipe 19, thus spraying the surface of the steel rod 2. like Figure 2 and Figure 3As shown, the drive mechanism is used to drive the steel rod 2 to rotate and drive the spraying mechanism to reciprocate to spray the surface of the steel rod 2. In order to drive the threaded rod 21 to rotate while driving the steel rod 2 to rotate, the drive mechanism includes the threaded rod 21, the moving plate 22, the first rotating shaft 23, the motor 25 and the connecting parts. The fixed frame 3 has a moving groove 29, and the threaded rod 21 is rotatably disposed in the moving groove 29. One end of the moving plate 22 is threadedly engaged with the threaded rod 21, and the other end of the moving plate 22 is fixedly connected to the connecting pipe 18. The fixed frame 3 has a cavity 24, and the first rotating shaft 23 rotates... The first rotating shaft 23 is housed within the cavity 24. One end of the first rotating shaft 23 is coaxially and fixedly connected to one end of the threaded rod 21. The motor 25 is mounted on the fixed frame 3, and its output end is coaxially and fixedly connected to one end of the first rotating shaft 23. A connecting piece is housed within the fixed frame 3 to connect the first rotating shaft 23 and the rotating ring 6. To enable the motor 25 to drive the steel rod 2 to rotate, the connecting piece includes a large gear 26 and a small gear 27. The large gear 26 is fitted onto the first rotating shaft 23 and coaxially and fixedly connected to it. The small gear 27 is fitted onto the rotating ring 6 and coaxially and fixedly connected to it. The pinion 27 and gear 26 are meshed. By starting the motor 25, the output of the motor 25 rotates, driving the first shaft 23 to rotate. The rotation of the first shaft 23 drives the threaded rod 21 to rotate, simultaneously driving the gear 26 to rotate. The threaded rod 21 drives the moving plate 22 to slide along the inner wall of the moving groove 29. The moving plate 22 drives the connecting rod to move, extending the telescopic rod. It should be noted that the material of the telescopic rod is not excessively soft; after being stretched, the telescopic rod is unlikely to deform excessively under the pressure of the liquid, and the distance the moving plate 22 moves allows... The telescopic rod "supports" the flow of liquid, thus driving multiple nozzles 20 to move horizontally and spray towards the surface of the steel rod 2. Meanwhile, the first rotating shaft 23 drives the large gear 26 to rotate, the large gear 26 drives the small gear 27 to rotate, the small gear 27 drives the rotating ring 6 to rotate, and the rotating ring 6 drives the connecting plate 8 to slide along the inner wall of the slot 28. The connecting plate 8 drives the fixed steel rod 2 to rotate. Since the large gear 26 has more teeth than the small gear 27, the small gear 27 drives the steel rod 2 to rotate at a faster speed. The multiple nozzles 20 can spray the surface of the steel rod 2 evenly before moving. Working principle: When the surface coating device of the steel bar 2 production line sprays a coating onto the surface of the steel bar 2, it keeps the steel bar 2 horizontal by inserting one end of the steel bar 2 through the through hole 5 and into the placement hole 4. By rotating the second clamping plate 10, the two fixing plates 11 are brought into contact, and the two fixing plates 11 are fixed with bolts 12. The steel bar 2 is fixed by the clamping and fixing of the two clamping plates to prevent it from moving out of the placement hole 4. At the same time, the water pump 14 and the motor 25 are started. The water pump 14 draws the liquid from the storage tank 13 and delivers it to multiple spray nozzles 20 through the water outlet pipe 16, the telescopic pipe 17, the connecting pipe 18, and the arc pipe 19, thus spraying the surface of the steel bar 2. The motor 25 is started, and the output end of the motor 25 rotates, driving the first rotating shaft 23 to rotate. The rotation of the first rotating shaft 23 drives the first rotating shaft 23 to rotate. As the threaded rod 21 rotates, it drives the large gear 26 to rotate. The threaded rod 21 drives the moving plate 22 to slide along the inner wall of the moving groove 29. The moving plate 22 drives the connecting rod to move, and the connecting rod extends the telescopic rod. This drives multiple nozzles 20 to move horizontally and spray towards the surface of the steel rod 2. Meanwhile, the first rotating shaft 23 drives the large gear 26 to rotate, the large gear 26 drives the small gear 27 to rotate, the small gear 27 drives the rotating ring 6 to rotate, and the rotating ring 6 drives the connecting plate 8 to slide along the inner wall of the slot 28. The connecting plate 8 drives the fixed steel rod 2 to rotate. Since the large gear 26 has more teeth than the small gear 27, the small gear 27 drives the steel rod 2 to rotate at a faster speed. Multiple nozzles 20 can spray the surface of the steel rod 2 evenly before moving, thus ensuring that the surface of the steel rod 2 is sprayed evenly.
[0025] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.
Claims
1. A surface coating device for a steel bar production line, comprising a base (1) and steel bars (2), characterized in that, Also includes: A fixed frame (3) is fixedly connected to the base (1). The fixed frame (3) has a placement hole (4) and a through hole (5) that cooperate with the steel rod (2). The inner walls of the placement hole (4) and the through hole (5) are rotatably engaged with the steel rod (2). A fixing component is rotatably mounted on the fixing frame (3) for fixing one end of the steel rod (2); A spraying mechanism is provided on the base (1) for spraying a coating onto the steel rod (2); A driving mechanism is provided on the fixed frame (3) to drive the steel rod (2) to rotate while driving the spraying mechanism to move along the axis of the steel rod (2) above the steel rod (2) and uniformly spray the surface of the steel rod (2).
2. The surface spraying device for a steel bar production line according to claim 1, characterized in that, The fixing component includes: Rotary ring (6), the fixed frame (3) has a rotating groove (7) that cooperates with the rotating ring (6), and the rotating ring (6) is rotatably disposed in the fixed frame (3); A connecting plate (8) is fixedly connected at one end to one end of the rotating ring (6), and at the other end it passes through the fixing frame (3) and extends outward; A clamping member is provided at one end of the connecting plate (8) for fixing the steel rod (2).
3. The surface spraying device for a steel bar production line according to claim 2, characterized in that, The clamping element includes: A first clamping plate (9) is fixedly connected at one end to the other end of the connecting plate (8); The second clamping plate (10) is hinged to the first clamping plate (9) by a hinge. The first clamping plate (9) and the second clamping plate (10) form a clamping space and cooperate with the steel rod (2). The fixing plate (11) is fixedly connected to one end of both the first clamping plate (9) and the second clamping plate (10); Bolt (12), both of the fixing plates (11) are threadedly engaged with the bolt (12).
4. The surface spraying device for a steel bar production line according to claim 3, characterized in that, The spraying mechanism includes: A liquid storage tank (13) is mounted on the base (1); A water pump (14) is connected to the storage tank (13) via a water inlet pipe (15) at its input end. Water outlet pipe (16), one end of which is connected to the water pump (14); A spraying component is movably disposed at one end of the water outlet pipe (16) for spraying a coating onto the surface of the steel bar (2).
5. The surface spraying device for a steel bar production line according to claim 4, characterized in that, The spray component includes: Telescopic pipe (17), one end of which is connected to the water outlet pipe (16); A connecting pipe (18) is provided, one end of which is connected to the other end of the telescopic pipe (17). An arc-shaped tube (19) is located above the steel rod (2), and the middle part of the arc-shaped tube (19) is connected to the other end of the connecting tube (18). The nozzle (20) is evenly distributed on the arc-shaped tube (19).
6. The surface spraying device for a steel bar production line according to claim 5, characterized in that, The drive mechanism includes: The threaded rod (21) has a movable groove (29) inside the fixed frame (3), and the threaded rod (21) is rotatably disposed in the movable groove (29); A movable plate (22) is provided, one end of which is threadedly engaged with the threaded rod (21), and the other end of which is fixedly connected to the connecting pipe (18). The first rotating shaft (23) has a cavity (24) inside the fixing frame (3). The first rotating shaft (23) is rotatably disposed in the cavity (24). One end of the first rotating shaft (23) is coaxially and fixedly connected to one end of the threaded rod (21). The motor (25) is mounted on the fixed frame (3), and the output end of the motor (25) is coaxially and fixedly connected to one end of the first rotating shaft (23); A connector is disposed within the fixing frame (3) for connecting the first rotating shaft (23) and the rotating ring (6).
7. A surface coating device for a steel bar production line according to claim 6, characterized in that, The connector includes: A large gear (26) is mounted on the first rotating shaft (23) and is coaxially and fixedly connected to the first rotating shaft (23); The small gear (27) is mounted on the rotating ring (6) and is coaxially fixedly connected to the rotating ring (6). The small gear (27) meshes with the large gear (26).
8. A surface spraying device for a steel bar production line according to claim 5, characterized in that, The outlet pipe (16) and the connecting pipe (18) are both S-shaped, and the telescopic pipe (17) is parallel to the steel rod (2).
9. A surface coating device for a steel bar production line according to claim 2, characterized in that, Both ends of the connecting plate (8) are arc-shaped, and the fixing frame (3) has a slot (28) that matches the connecting plate (8).
10. A surface coating device for a steel bar production line according to claim 9, characterized in that, The through hole (5), the slot (28) and the rotating slot (7) are all coaxially fixedly connected and their cross-sectional areas increase sequentially.