A spraying device and a spraying tool for cylindrical workpieces

Abstract

The application belongs to the technical field of spraying, and particularly relates to a spraying tool and a spraying device for cylindrical workpieces. The spraying tool comprises a frame body, a transmission chain, a plurality of chain wheels, a driving system and a plurality of columnar positioning structures. The plurality of chain wheels are rotationally arranged on the top of the frame body, the transmission chain is engaged with the plurality of chain wheels to form a closed conveying route, the driving system is drivingly connected with at least one chain wheel, and the plurality of columnar positioning structures are distributed along the upper side of the transmission chain. The columnar positioning structure is used for inserting and fixing the cylindrical workpiece in an upward positioning posture. The spraying tool realizes vertical insertion and continuous conveying of the cylindrical workpiece, effectively avoids the shaking problem caused by single-point suspension of the traditional suspension tool, and significantly reduces the risk of collision between the workpieces and the collision of the spray gun. Meanwhile, the workpiece is sprayed in a vertical posture, which is beneficial to uniform distribution of the paint and improves the consistency of the coating thickness.

Description

Technical Field

[0001] This application belongs to the field of spraying technology, specifically relating to a spraying fixture and spraying device for cylindrical workpieces. Background Technology

[0002] In the field of surface treatment of cylindrical workpieces, the coating treatment of tubular workpieces such as threaded sleeves is currently mainly carried out by manual spraying. This method has many drawbacks: it is difficult to strictly control the coating parameters during the spraying process, resulting in large differences in coating thickness for each workpiece and unstable coating quality; when the ambient temperature is low, self-drying coatings cannot dry completely in time, causing the coating to be easily scratched or leaving screen marks after the material is unloaded and placed, which seriously affects production efficiency and product quality.

[0003] Existing automated spraying technology also has significant shortcomings. Currently used automated spraying methods mostly employ suspended fixtures with a single suspension point design, which causes significant swaying of the workpiece during the movement of the conveyor belt. This can easily lead to collisions between workpieces and accidental collisions with the spray gun, posing a risk of inducing product damage and equipment failure. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a spraying fixture and spraying device for cylindrical workpieces.

[0005] In a first aspect, this application provides a spraying fixture for cylindrical workpieces, comprising: Frame; Transmission chain; Multiple sprockets are rotatably mounted on the top of the frame, and the drive chain meshes with the multiple sprockets to form a closed conveying route; A drive system, connected to at least one of the aforementioned sprocket drives; Multiple columnar positioning structures are distributed along the upper side of the transmission chain. The columnar positioning structures are used to insert and fix the columnar workpiece in an upward positioning posture.

[0006] Optionally, the top of the frame is also provided with multiple support wheels, and the transmission chain is above the support wheels and rolls in cooperation with them.

[0007] Optionally, the support wheel is a ball bearing support wheel, a needle roller bearing support wheel, or an oil-impregnated bearing support wheel.

[0008] Optionally, the drive system is a servo motor, a stepper motor, or a geared motor.

[0009] Optionally, the drive system includes a drive motor, a drive pulley driven by the drive motor, a driven pulley disposed on the shaft of the sprocket, and a drive belt driven by the drive pulley and the driven pulley.

[0010] Optionally, the driving pulley and the driven pulley are pulleys or synchronous pulleys, and the transmission belt is a belt or synchronous belt.

[0011] Optionally, the columnar positioning structure includes a fixed column and a positioning column detachably disposed at the top of the fixed column, wherein the fixed column is fixed to the outer chain plate of the transmission chain or fixed to the end of the pin of the transmission chain.

[0012] Optionally, the fixed column is welded to the outer chain plate of the transmission chain.

[0013] Optionally, the fixed column is threaded or welded to the pin of the transmission chain.

[0014] Optionally, the positioning post is threadedly connected to the fixing post, and the diameter of the positioning post is larger than the diameter of the fixing post.

[0015] Secondly, this application provides a spraying apparatus, comprising: The spraying fixtures described above; A ventilation hood, at least partially covering the spraying fixture, is used for conveying cylindrical workpieces from inside the ventilation hood; A hot air blower, used to blow hot air into the ventilation hood; A spraying system for spraying paint onto a cylindrical workpiece on the spraying fixture.

[0016] The beneficial effects of this application are: The first aspect of this application provides a spraying fixture for cylindrical workpieces. This fixture features a closed conveying path consisting of multiple sprockets and a drive chain on a frame, coupled with a drive system to achieve stable transmission. Multiple cylindrical positioning structures are distributed along the upper side of the drive chain to vertically position the cylindrical workpiece using an insertion method, ensuring it maintains an upward and stable posture during transport. This spraying fixture achieves vertical insertion-type fixing and continuous transport of cylindrical workpieces, effectively avoiding the swaying problem caused by single-point suspension in traditional suspended fixtures, and significantly reducing the risk of collisions between workpieces and between the workpiece and the spray gun. Simultaneously, spraying the workpiece in a vertical posture facilitates uniform paint distribution and improves coating thickness consistency.

[0017] The spraying device provided in the second aspect of this application achieves automatic conveying, precise spraying, closed operation and efficient drying of cylindrical workpieces through the coordinated work of various components. It not only improves production efficiency and coating quality stability, but also improves the working environment and safety. It is particularly suitable for automated coating production lines for tubular workpieces with large-volume and high-quality requirements. Attached Figure Description

[0018] Figure 1 A schematic diagram of a spraying fixture for a cylindrical workpiece provided in an embodiment of this application; Figure 2 A schematic diagram of another spraying fixture for cylindrical workpieces provided in this application embodiment; Figure 3 A schematic diagram of the connection between the columnar positioning structure and the transmission chain provided in an embodiment of this application; Figure 4 This is a schematic diagram of the front view structure of the spraying device provided in the embodiments of this application; Figure 5 This is a top-view structural diagram of the spraying apparatus provided in the embodiments of this application.

[0019] In the diagram: 110, frame; 120, drive chain; 130, sprocket; 140, drive system; 141, drive motor; 142, active drive wheel; 143, passive drive wheel; 144, drive belt; 150, columnar positioning structure; 151, fixed column; 152, positioning column; 160, support wheel; 200, ventilation hood; 300, hot air blower; 400, spraying system. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] like Figure 1-3 As shown, in a first aspect, this application provides a spraying fixture for cylindrical workpieces, comprising: a frame 110, a transmission chain 120, multiple sprockets 130, a drive system 140, and multiple columnar positioning structures 150; wherein, the multiple sprockets 130 are rotatably disposed on the top of the frame 110, and the transmission chain 120 meshes with the multiple sprockets 130 to form a closed conveying route; the drive system 140 is drivenly connected to at least one sprocket 130; the multiple columnar positioning structures 150 are distributed along the upper side of the transmission chain 120, and the columnar positioning structures 150 are used to insert and fix the cylindrical workpiece in an upward positioning posture.

[0022] The first aspect of this application provides a spraying fixture for cylindrical workpieces. This fixture utilizes a closed conveying route consisting of multiple sprockets 130 and a transmission chain 120 on a frame 110, coupled with a drive system 140 to achieve stable transmission. Multiple cylindrical positioning structures 150 are distributed along the upper side of the transmission chain 120 to vertically position the cylindrical workpiece using an insertion method, ensuring it maintains an upward and stable posture during transport. This spraying fixture achieves vertical insertion-type fixing and continuous transport of cylindrical workpieces, effectively avoiding the swaying problem caused by single-point suspension in traditional suspended fixtures, and significantly reducing the risk of collisions between workpieces and the spray gun. Simultaneously, spraying the workpiece in a vertical posture facilitates uniform paint distribution and improves coating thickness consistency.

[0023] It should be noted that the structure of the transmission chain 120 is existing technology. The transmission chain 120 consists of alternating outer links (outer chain plate + pin) and inner links (inner chain plate + sleeve + roller), forming a movable hinge structure through the cooperation of the pin and the sleeve. This structure allows the chain to bend flexibly to adapt to the engagement of the sprocket 130.

[0024] In one possible implementation, the top of the frame 110 is also provided with a plurality of support wheels 160, and the transmission chain 120 is above the support wheels 160 and rolls in cooperation with them.

[0025] Specifically, several support wheels 160 are installed at the top of the frame 110, below the straight section of the transmission chain 120. These support wheels 160 are spaced apart along the direction of the transmission chain 120, with their wheel surfaces contacting the bottom surface of the transmission chain 120 to form a rolling support structure. When the transmission chain 120 is driven by the drive system 140, the support wheels 160 rotate synchronously with the chain, thereby providing continuous external support for the transmission chain 120 and reducing sagging, vibration, or deviation of the chain due to its own weight or uneven load. Through the rolling cooperation of the support wheels 160, the running stability of the transmission chain 120 is effectively improved when it is transported over long distances or carries multiple workpieces, preventing the chain from sagging or shaking, ensuring that the columnar positioning structure 150 and the columnar workpieces mounted on it maintain a stable spatial posture during transportation, further avoiding uneven coating or workpiece collisions caused by shaking during the spraying process, and improving the reliability and consistency of the entire spraying fixture.

[0026] In one possible implementation, the support wheel 160 is a ball bearing support wheel, a needle roller bearing support wheel, or an oil-impregnated bearing support wheel. Specifically, both ends of the shaft of the support wheel 160 are connected to suitable mounting seats, which are fixed to the top of the frame 110.

[0027] In one possible implementation, such as Figure 1 As shown, the drive system 140 is a servo motor, a stepper motor, or a geared motor.

[0028] Specifically, a servo motor, stepper motor, or geared motor is installed at a predetermined position on the frame 110 and is powered by at least one sprocket 130 (as the drive wheel) via a coupling or gear transmission. When the system starts, the motor receives a control signal and outputs torque to drive the drive sprocket 130 to rotate, thereby driving the closed transmission chain 120 to circulate along the route formed by the set of sprockets 130.

[0029] In one possible implementation, the drive system 140 includes a drive motor 141, a drive pulley 142 driven by the drive motor 141, a passive pulley 143 disposed on the shaft of the sprocket 130, and a drive belt 144 driven by the drive pulley 142 and the passive pulley 143.

[0030] Specifically, a drive motor 141 (which can be a servo motor, stepper motor, or geared motor) is fixedly installed at a designated position on the frame 110. An active drive wheel 142 is mounted on the output shaft of the drive motor 141. A passive drive wheel 143, corresponding to and matching the active drive wheel 142, is mounted at one end of the shaft of the sprocket 130 (i.e., the active sprocket 130). A transmission belt 144 is then fitted between the active drive wheel 142 and the passive drive wheel 143 to achieve a flexible transmission connection between them. When the drive motor 141 starts, its output shaft drives the active drive wheel 142 to rotate, transmitting power to the passive drive wheel 143 via the transmission belt 144. This, in turn, drives the sprocket 130 to rotate, making the sprocket 130 the active sprocket 130, driving the entire transmission chain 120 along a closed path, thereby causing the columnar positioning structure 150 and the fixed columnar workpiece to move smoothly.

[0031] This implementation method achieves power transmission between the motor and the sprocket 130 through belt drive, which has the advantages of simple structure, convenient installation and maintenance, stable operation, and shock absorption. At the same time, the motor installation position can be adjusted appropriately to avoid the spatial layout restrictions imposed by direct motor connection and improve the flexibility of equipment layout.

[0032] In one possible implementation, the driving pulley 142 and the driven pulley 143 are pulleys or timing pulleys, and the drive belt 144 is a belt or timing belt.

[0033] In one possible implementation, such as Figure 3 As shown, the columnar positioning structure 150 includes a fixed column 151 and a positioning column 152 detachably disposed at the top of the fixed column 151. The fixed column 151 is fixed to the outer chain plate of the transmission chain 120 or fixed to the end of the pin of the transmission chain 120.

[0034] Specifically, the positioning post 152, as a component that directly contacts the cylindrical workpiece, has a positioning boss or conical surface structure on its top that adapts to the inner diameter of the workpiece, facilitating vertical insertion and positioning of the workpiece. Because it is detachably mounted on the fixed post 151, positioning posts 152 of corresponding size, height, or material can be replaced according to different models or specifications of cylindrical workpieces, enabling rapid tooling switching and flexible adaptation.

[0035] This implementation divides the positioning structure into a fixed post 151 and a replaceable positioning post 152, which not only ensures the strength and connection stability of the overall structure, but also improves the versatility and maintenance convenience of the tooling: the fixed post 151 is fixed to the chain as a load-bearing component, while the easily damaged or replaceable positioning post 152 can be disassembled and replaced separately, avoiding the cost waste caused by replacing the whole thing. At the same time, it is easy to clean, maintain, or flexibly adjust for different process requirements (such as spraying height, workpiece center of gravity), which significantly improves the adaptability and production efficiency of the spraying tooling.

[0036] In one possible implementation, the fixing post 151 is welded to the outer chain plate of the drive chain 120. Specifically, the welded connection provides a robust and durable connection, ensuring that the fixing post 151 can withstand the weight of the workpiece and any additional operating loads during the operation of the drive chain 120 without loosening or shifting. In one possible implementation, the fixed post 151 is threaded or welded to the pin of the transmission chain 120.

[0037] Specifically, an internal threaded hole is machined at the end of the pin of the transmission chain 120, and correspondingly, a matching external thread is provided at the bottom of the fixing post 151. During installation, the fixing post 151 is tightened onto the end of the pin. If necessary, anti-loosening nuts or thread-locking adhesive can be used to enhance the reliability of the connection and vibration resistance. This method facilitates disassembly and replacement, and is suitable for occasions where the position of the fixing post 151 needs to be adjusted according to production requirements or different specifications of the fixing post 151 need to be replaced. It has good flexibility and maintainability.

[0038] In another implementation, one end of the fixed post 151 is directly welded to the end face of the pin of the transmission chain 120, forming a strong metallurgical bond through fusion welding, thus achieving a high-strength, permanent connection.

[0039] In one possible implementation, the positioning post 152 is threadedly connected to the fixing post 151, and the diameter of the positioning post 152 is larger than the diameter of the fixing post 151.

[0040] Specifically, an external thread is machined at the top of the fixed column 151, and a matching internal thread hole is provided at the bottom of the positioning column 152. The two are detachably connected by thread engagement. To enhance connection stability, anti-loosening washers, lock nuts, or thread-locking adhesive can be used to prevent loosening due to vibration during equipment operation. The diameter of the positioning column 152 is larger than that of the fixed column 151, increasing the contact area between the positioning column 152 and the columnar workpiece and improving the overall structural rigidity.

[0041] like Figure 4 and Figure 5As shown, in a second aspect, this application provides a spraying apparatus, including: a spraying fixture, a ventilation hood 200, a hot air blower 300, and a spraying system 400; wherein, the ventilation hood 200 covers at least part of the spraying fixture for conveying cylindrical workpieces from inside the ventilation hood 200; the hot air blower 300 is used to blow hot air into the ventilation hood 200; and the spraying system 400 is used to spray paint onto the cylindrical workpieces on the spraying fixture.

[0042] Specifically, in the spraying device, the cylindrical workpiece is vertically fixed to the spraying fixture via a columnar positioning structure 150, and runs continuously along the closed conveying route with the transmission chain 120. The entire conveying process is at least partially completed inside the ventilation hood 200, which covers the key areas of the spraying fixture (such as the spraying area and the drying area), forming a controlled working environment, effectively limiting the diffusion of paint mist, facilitating centralized extraction and treatment, improving workshop air quality, and reducing the impact of external airflow disturbances on the spraying quality.

[0043] When the workpiece enters the spraying area, the spraying system 400 starts, automatically and evenly spraying the coating onto the workpiece surface, achieving mechanized and standardized operation and significantly improving coating uniformity and process repeatability. Subsequently, the workpiece moves with the tooling to the next area, where the hot air blower 300 continuously blows hot air into the ventilation hood 200 to force-dry the wet coating. The hot air environment can significantly increase the temperature of the workpiece and coating, accelerating solvent evaporation or resin cross-linking reaction. Especially in low-temperature environments, it effectively solves the problem of self-drying coatings not drying completely, shortens the drying cycle, and prevents scratches or screen marks from occurring on the workpiece after unloading due to the coating not being dry.

[0044] The spraying device provided in the second aspect of this application achieves automatic conveying, precise spraying, closed operation and efficient drying of cylindrical workpieces through the coordinated work of various components. It not only improves production efficiency and coating quality stability, but also improves the working environment and safety. It is particularly suitable for automated coating production lines for tubular workpieces with large-volume and high-quality requirements.

[0045] It should be noted that the spraying system 400 adopts existing technology. Specifically, the spraying system 400, as the core execution unit of the spraying device, is used to automatically apply paint to the surface of the workpiece. Its typical components include a spray gun, a paint supply device, an atomization and power source system, a control system interface, and a piping system. The spray gun is mounted in a fixed position within the ventilation hood 200 or on a robotic arm. Depending on the process requirements, an air spray gun, airless spray gun, or electrostatic spray gun can be selected. Multiple guns can be combined to achieve uniform coverage of the workpiece's outer circumference and end faces. The paint supply device consists of a paint tank, a paint pump (such as a diaphragm pump or gear pump), and a pressure stabilizing device to ensure a stable and continuous supply of paint to the spray gun. The atomization and power source system is configured with a compressed air source (for air spraying) or a high-voltage electrostatic generator (for electrostatic spraying) depending on the spraying method, and integrates solenoid valves or proportional valves to achieve automatic start / stop of the spray gun and precise flow control. The entire system is linked to the main control system via a PLC or industrial controller to achieve precise control of the spraying sequence, path, and width. Various corrosion-resistant, well-sealed paint supply pipelines, air pipelines, and power lines connect all components into a unified whole. Some systems are also equipped with an automatic cleaning circuit for easy color change and maintenance. The coordinated work of these components to complete the delivery, atomization, and precise application of paint is a key guarantee for achieving automated, high-quality spraying.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0047] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A spray tooling for a cylindrical workpiece, characterized by, include: Frame (110); Transmission chain (120); Multiple sprockets (130) are rotatably mounted on the top of the frame (110), and the transmission chain (120) meshes with the multiple sprockets (130) to form a closed conveying route; A drive system (140) is driven to at least one of the sprockets (130); Multiple columnar positioning structures (150) are distributed along the upper side of the transmission chain (120). The columnar positioning structures (150) are used to insert and fix the columnar (151) shaped workpiece in an upward positioning posture.

2. The spray tooling for cylindrical workpieces of claim 1, wherein, The top of the frame (110) is also provided with a plurality of support wheels (160), and the transmission chain (120) is above the support wheels (160) and rolls in cooperation with them.

3. The spray tooling for cylindrical workpieces of claim 2, wherein, The support wheel (160) is a ball bearing support wheel, a needle roller bearing support wheel, or an oil-impregnated bearing support wheel.

4. The spray fixture for a cylindrical workpiece of claim 1, wherein, The drive system (140) is a servo motor, a stepper motor, or a geared motor.

5. A spray tool for cylindrical workpieces according to any one of claims 1-4, characterized in that The drive system (140) includes a drive motor (141), an active drive wheel (142) driven and connected to the drive motor (141), a passive drive wheel (143) disposed on the shaft of the sprocket (130), and a drive belt (144) driven and connected to the active drive wheel (142) and the passive drive wheel (143).

6. The spray fixture for a cylindrical workpiece of claim 5, wherein, The active drive wheel (142) and the passive drive wheel (143) are pulleys or synchronous pulleys, and the drive belt (144) is a belt or synchronous belt.

7. A spray tool for cylindrical workpieces according to any one of claims 1-4, characterized in that The columnar positioning structure (150) includes a fixed column (151) and a positioning column (152) detachably disposed at the top of the fixed column (151). The fixed column (151) is fixed to the outer chain plate of the transmission chain (120) or fixed to the end of the pin shaft of the transmission chain (120).

8. The spray fixture for a cylindrical workpiece of claim 7, wherein, The fixed column (151) is welded to the outer chain plate of the transmission chain (120); Alternatively, the fixed column (151) may be threaded or welded to the pin of the transmission chain (120).

9. The spray fixture for a cylindrical workpiece of claim 8, wherein, The positioning post (152) is threadedly connected to the fixing post (151), and the diameter of the positioning post (152) is larger than the diameter of the fixing post (151).

10. A spray device characterized in that, include: The spraying fixture as described in any one of claims 1-9; A ventilation hood (200) at least partially covers the spraying fixture for conveying cylindrical workpieces from inside the ventilation hood (200); A hot air blower (300) is used to blow hot air into the ventilation hood (200); A spraying system (400) is used to spray paint onto a cylindrical workpiece on the spraying fixture.

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