A hot-rolled ribbed steel bar surface coating uniform spraying device

Abstract

The utility model discloses a hot rolling ribbed steel surface coating uniform spraying equipment, including frame, conveying mechanism, spraying mechanism, drying mechanism, guide mechanism and coating collection groove, guide mechanism is located conveying mechanism front end, contains the guide wheel of before and after height stagger, wheel face is equipped with annular recess that adapts with ribbed steel rib, conveying mechanism is by a plurality of interval arrangement's rubber roller and is composed, and each rubber roller independent connection driving motor, spraying mechanism contains gantry, nozzle group and coating supply system, drying mechanism is located frame end, contains drying cover with infrared heating pipe and temperature control component, coating collection groove is communicated with coating storage tank through the backflow pipe with filter valve, the utility model discloses can realize the stable conveying of steel bar, coating uniform spraying, coating recovery and accurate drying, promote coating quality and production efficiency, reduce the cost, be applicable to the surface coating processing of hot rolling ribbed steel.

Description

Technical Field

[0001] This utility model belongs to the field of surface treatment technology for steel bars in construction, specifically relating to a uniform spraying equipment for surface coating of hot-rolled ribbed steel bars. It is mainly used for automated spraying of functional coatings such as anti-corrosion and anti-rust coatings on the surface of hot-rolled ribbed steel bars to improve the corrosion resistance and service life of the steel bars. Background Technology

[0002] Hot-rolled ribbed steel bars are widely used in construction, bridge, and rail transit engineering due to their excellent mechanical and anchoring properties. To improve their corrosion and wear resistance, an anti-corrosion coating (such as epoxy resin or zinc-aluminum coating) is usually applied to their surface. The uniformity of the coating directly affects the protective effect and service life of the steel bars, therefore, high precision and stability are required for the spraying equipment.

[0003] Currently, surface coating of hot-rolled ribbed steel bars is mainly applied manually or using traditional mechanical spraying methods. Manual spraying is highly dependent on the operator's skill level, easily leading to uneven coating thickness, missed areas between ribs, and low efficiency, making it unsuitable for large-scale production. While traditional mechanical spraying equipment achieves automated operation, it suffers from the following shortcomings:

[0004] Hot-rolled ribbed steel bars have periodic ribs on their surface. Traditional nozzles are mostly set at a fixed angle and lack a multi-nozzle collaborative coverage design, making it difficult to completely cover the rib grooves and roots, resulting in inconsistent coating thickness and premature failure of weak parts. At the same time, if the conveying mechanism cannot stably clamp steel bars of different specifications, the steel bars are prone to shaking during the spraying process, further aggravating the uneven coating.

[0005] Different specifications of steel bars have different diameters and rib heights. The nozzles of existing equipment are mostly fixed and lack convenient position adjustment structures, making it difficult to quickly adapt to various steel bar models. Frequent machine stops are required for adjustment when changing specifications, affecting production continuity. If the guide mechanism cannot flexibly adjust its height, it will also limit the guiding effect on steel bars of different diameters.

[0006] During the spraying process, some paint does not adhere to the surface of the steel bars, which is easy to lead to waste. Moreover, most existing equipment lacks a dedicated paint collection and return structure, which not only increases costs but may also cause environmental pollution. At the same time, if the paint supply system cannot accurately control the flow rate, it will also lead to over-spraying or insufficient supply of paint.

[0007] After spraying, the coating needs to be cured in time. Traditional equipment drying devices are mostly integrated heating, which are not closely connected with the spraying process and lack precise temperature control. This can easily lead to coating sagging and wrinkling due to excessive waiting time or uneven heating, affecting the adhesion strength.

[0008] Therefore, in view of the shortcomings of existing spraying equipment in terms of uniformity, adaptability, economy and process coordination, there is an urgent need to develop a special equipment that can accurately adapt to the structural characteristics of hot-rolled ribbed steel bars, integrate stable conveying, multi-angle coordinated spraying, flexible adjustment, paint recycling and precise drying functions, and achieve uniform coating and high efficiency and energy saving. Summary of the Invention

[0009] To address the aforementioned problems, this utility model provides a uniform coating spraying device for hot-rolled ribbed steel bars. The specific technical solution is as follows: it includes a frame, a conveying mechanism, a spraying mechanism, and a drying mechanism. The conveying mechanism is located in the middle of the frame along its length and is used to convey the hot-rolled ribbed steel bars. The spraying mechanism includes a gantry frame, a nozzle assembly mounted on the gantry frame, and a paint supply system connected to the nozzle assembly. The spraying direction of the nozzle assembly is towards the conveying path of the conveying mechanism. The drying mechanism is located at the end of the frame, at the steel bar outlet. The drying mechanism includes a drying hood covering the conveying mechanism and a heating component installed inside the drying hood. A guiding mechanism is also provided on the frame. The guiding mechanism is located at the front end of the conveying mechanism and includes guide wheels arranged at different heights. The wheel surfaces of the guide wheels have annular grooves adapted to the rib patterns of the steel bars.

[0010] Furthermore, the conveying mechanism includes several conveying rollers, each of which is spaced apart along the length of the frame. The conveying rollers are rubber rollers, and both ends of the rubber rollers are rotatably connected to the frame through bearing seats. Each rubber roller is connected to a drive motor.

[0011] Furthermore, the nozzle assembly is vertically slidably mounted on the gantry, and the spray ranges of adjacent nozzles partially overlap; the nozzle assembly includes at least five nozzles arranged along the direction of rebar conveying.

[0012] Furthermore, the gantry is provided with a sliding groove in the horizontal direction; the nozzle includes a flow regulating valve, a fan-shaped nozzle head threadedly connected to the flow regulating valve, a movable bracket connected to the sliding groove of the gantry, and an air duct connected to the flow regulating valve.

[0013] Furthermore, the paint supply system includes a paint storage tank and a delivery pump. The input end of the delivery pump is connected to the paint storage tank, and the output end is connected to a flow regulating valve through an air duct.

[0014] Furthermore, the heating assembly includes horizontally spaced infrared heating tubes, which are detachably connected to the top of the drying hood. A temperature sensor is provided on the inner wall of the drying hood, and the temperature sensor is electrically connected to an external temperature controller.

[0015] Furthermore, the frame is provided with a paint collection tank below the spraying mechanism. The bottom of the collection tank is connected to a return pipe, and the other end of the return pipe is connected to the paint storage tank of the paint supply system. A filter valve is provided on the return pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The staggered guide wheels at varying heights, combined with the annular grooves that adapt to the rib pattern, can limit the movement of the reinforcing bars in multiple directions, preventing deviation and shaking during transport and ensuring that long reinforcing bars enter the spraying area accurately. The independently driven rubber roller conveyor mechanism ensures consistent conveying speed, avoiding slippage and speed fluctuations. The rubber material increases friction and prevents scratches, ensuring stable and intact transport of the reinforcing bars. The nozzle assembly can be horizontally adjusted via the gantry's sliding grooves and vertical sliding to accommodate reinforcing bars of different specifications. The overlapping spray range of at least five nozzles, combined with the flow regulating valve, can fully cover the surface of the reinforcing bars and the rib grooves, solving the problems of missed spraying and uneven coating. The drying mechanism at the end of the frame is closely integrated with the spraying process to reduce coating drips. The infrared heating tube, combined with the temperature control system, achieves precise temperature control, ensuring uniform curing of the coating and improving adhesion strength. Attached Figure Description

[0018] For ease of explanation, this utility model is described in detail below with reference to the specific embodiments and accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the spraying mechanism;

[0021] Figure 3 This is a schematic diagram of the nozzle structure;

[0022] Figure 4 This is a schematic diagram of the guide wheel structure.

[0023] In the diagram: 1-Frame; 2-Conveying mechanism; 3-Spraying mechanism; 31-Gantry; 32-Nozzle; 321-Flow regulating valve; 322-Fan-shaped nozzle head; 323-Moving support; 324-Air duct; 33-Slide groove; 4-Drying mechanism; 5-Guiding mechanism; 51-Guiding wheel; 52-Annular groove; 6-Paint collection tank. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Example:

[0026] like Figure 1 As shown, the uniform coating spraying equipment for hot-rolled ribbed steel bars in this embodiment includes a frame 1, a conveying mechanism 2, a spraying mechanism 3, a drying mechanism 4, a guiding mechanism 5, and a coating collection tank 6.

[0027] The frame 1 is welded from structural steel and has an overall rectangular frame structure, providing stable support for each mechanism. The guide mechanism 5 is located at the front end of the conveying mechanism 2. It includes two sets of guide wheels 51 arranged at the front and rear, with the front set of guide wheels installed at a higher height than the rear set, forming a staggered layout.

[0028] like Figure 4 As shown, the guide wheel 51 has an annular groove 52 on its surface. The groove has an arc-shaped cross-section, and its width matches the width of the reinforcing bar rib, allowing it to accommodate hot-rolled ribbed reinforcing bars of different specifications. The guide wheel 51 is connected to the frame 1 via a bearing seat, enabling it to rotate flexibly and reducing friction with the reinforcing bar.

[0029] The conveying mechanism 2 has four conveying rollers arranged in an array along the length of the frame 1. The conveying rollers are made of rubber and are rotatably connected to the frame 1 at both ends through bearing seats. Each conveying roller is connected to a drive motor through a coupling (this is a standard operation and is not shown in the figure). The motor speed is adjustable, so that the conveying speed can be varied in the range of 3-8 m / min to adapt to different spraying requirements.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, the spraying mechanism 3 is located above the conveying mechanism 2, and is arranged in two sets, including a gantry frame 31, a nozzle assembly, and a paint supply system. The gantry frame 31 spans the frame 1, and the crossbeam of the gantry frame 31 is provided with a sliding groove 33 in the horizontal direction. The nozzle assembly includes 5 nozzles 32, each nozzle 32 consisting of a flow regulating valve 321, a fan-shaped nozzle head 322, a movable support 323, and an air duct 324. The fan-shaped nozzle head 322 is threadedly connected to the flow regulating valve 321. One end of the movable support 323 is slidably connected to the sliding groove 33 of the gantry frame 31, and the other end is fixed to the flow regulating valve 321. The horizontal position of the nozzle 32 can be adjusted by the movable support 323.

[0031] The paint supply system (existing technology, not shown) includes a 150L paint storage tank and a delivery pump (flow rate 20-80L / h). The input end of the delivery pump is connected to the paint storage tank, and the output end is connected to the flow regulating valve 321 through the air duct 324. The paint flow rate of each nozzle can be precisely controlled through the flow regulating valve 321.

[0032] The drying mechanism 4 is located at the end of the frame 1, specifically at the rebar outlet, 33m away from the spraying mechanism. It includes a drying hood covering the conveying mechanism 2 and a heating assembly. The heating assembly consists of six horizontally spaced infrared heating tubes, spaced 40cm apart, which are detachably connected to the top of the drying hood via clips. A temperature sensor is installed on the inner wall of the drying hood and electrically connected to an external temperature controller, allowing the drying temperature to be controlled between 60-150℃ to meet the curing requirements of different coatings.

[0033] The frame 1 has a rectangular paint collection tank 6 below the spraying mechanism 3. The bottom of the collection tank is tilted to one side at an angle of 5°. The lowest point is connected to a return pipe (5cm in diameter). The other end of the return pipe is connected to the paint storage tank of the paint supply system. A 120-mesh filter valve is installed on the return pipe to filter and recover impurities in the paint.

[0034] During use, adjust each component according to the specifications of the reinforcing bars: adjust the position of the guide wheel 51 by adapting the annular groove 52 of the guide wheel to match the rib pattern of the reinforcing bar; adjust the conveying speed of the conveying mechanism 2; adjust the horizontal position and height of the nozzle 32 according to the diameter of the reinforcing bar by adjusting the slide groove 33 and slide rail of the gantry frame 31, and set the flow rate of the flow regulating valve 321; set the drying temperature of the drying mechanism 4. The reinforcing bar is placed in the guide mechanism 5 and conveyed to the spraying mechanism 3 by the conveying mechanism 2. The nozzle group sprays the surface of the reinforcing bar, and the excess paint falls into the collection tank 6, is filtered, and then flows back to the paint storage tank; the sprayed reinforcing bar is conveyed to the drying mechanism 4 for drying and curing, and finally the coated reinforcing bar is output from the end of the frame 1.

[0035] This embodiment effectively improves the uniformity and stability of the coating on the steel bar surface through the coordinated operation of various mechanisms, thereby increasing production efficiency, reducing costs, and meeting environmental protection requirements.

[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A uniform coating spraying device for hot-rolled ribbed steel bars, characterized in that, The system includes a frame (1), a conveying mechanism (2), a spraying mechanism (3), and a drying mechanism (4). The conveying mechanism (2) is located in the middle of the frame along the length of the frame and is used to convey hot-rolled ribbed steel bars. The spraying mechanism (3) includes a gantry frame (31), a nozzle assembly installed on the gantry frame (31), and a paint supply system connected to the nozzle assembly. The spraying direction of the nozzle assembly is towards the conveying path of the conveying mechanism (2). The drying mechanism (4) is located at the end of the frame (1) at the steel bar outlet. The drying mechanism (4) includes a drying hood covering the conveying mechanism (2) and a heating component installed inside the drying hood. The frame is also provided with a guide mechanism (5). The guide mechanism (5) is located at the front end of the conveying mechanism (2) and includes guide wheels (51) arranged at different heights. The wheel surface of the guide wheel (51) is provided with an annular groove (52) that matches the rib pattern of the steel bar.

2. The uniform coating spraying equipment for hot-rolled ribbed steel bars according to claim 1, characterized in that: The conveying mechanism (2) includes several conveying rollers, each conveying roller is spaced apart along the length of the frame, the conveying rollers are rubber rollers, the two ends of the rubber rollers are rotatably connected to the frame through bearing seats, and each rubber roller is connected to a drive motor.

3. The uniform coating spraying equipment for hot-rolled ribbed steel bars according to claim 1, characterized in that: The nozzle assembly is vertically slidably mounted on the gantry (31), and the spray ranges of adjacent nozzles (32) partially overlap; the nozzle assembly includes at least five nozzles (32) arranged along the direction of rebar conveying.

4. The uniform coating spraying equipment for hot-rolled ribbed steel bars according to claim 3, characterized in that: The gantry (31) is provided with a slide groove (33) in the horizontal direction; the nozzle (32) includes a flow regulating valve (321), a fan-shaped nozzle head (322) threadedly connected to the flow regulating valve (321), a movable bracket (323) connected to the slide groove (33) of the gantry (31), and an air duct (324) connected to the flow regulating valve (321).

5. The uniform coating spraying equipment for hot-rolled ribbed steel bars according to claim 4, characterized in that: The paint supply system includes a paint storage tank and a delivery pump. The input end of the delivery pump is connected to the paint storage tank, and the output end is connected to the flow regulating valve (321) through a duct (324).

6. The uniform coating spraying equipment for hot-rolled ribbed steel bars according to claim 1, characterized in that: The heating assembly includes horizontally spaced infrared heating tubes, which are detachably connected to the top of the drying hood. A temperature sensor is provided on the inner wall of the drying hood, and the temperature sensor is electrically connected to an external temperature controller.

7. The uniform coating spraying equipment for hot-rolled ribbed steel bars according to claim 1, characterized in that: The frame is provided with a paint collection tank (6) below the spraying mechanism (3). The bottom of the collection tank is connected to a return pipe, and the other end of the return pipe is connected to the paint storage tank of the paint supply system. A filter valve is provided on the return pipe.

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