Paint spraying and coloring equipment for transparent glass cup

Abstract

The invention relates to paint spraying and coloring equipment for a transparent glass cup, and belongs to the technical field of paint spraying. The equipment comprises a machine base, and a rotating mechanism, a paint spraying mechanism and an air spraying assembly are integrated on the machine base. The rotating mechanism comprises a rotating disc with a cup stand, and the paint spraying mechanism comprises a paint spraying head facing the cup stand. The air spraying assembly comprises an air spraying base surrounding the paint spraying head and annularly-distributed air outlet holes and is used for forming an air curtain surrounding the paint spraying head. An air suction opening is formed in the position, corresponding to the cup holder, of the rotating disc and matched with the air curtain to form a directional air flow channel from top to bottom, and an adsorption cavity and a purification device communicated with the air suction opening are arranged in the machine base. And the purification device comprises a drying and filtering mechanism. The equipment is in a three-side open type layout, and the cup holder is provided with an independent autorotation driving piece. The problems of paint mist flying pollution, environmental moisture interference and non-uniform paint spraying on the inner wall of the cylinder are solved through paint mist restraint by the air curtain, directional airflow recovery and purification, cup body rotation and open layout, and the paint utilization rate, the paint film quality and the operation safety are improved.

Description

Technical Field

[0001] This application relates to the field of spray painting technology, and in particular to a spray painting and coloring device for a transparent glass cup. Background Technology

[0002] Transparent glass products, with their clear and bright texture, are widely used in catering, gifts, and home decoration. However, while their inherent transparency is a visual advantage, it also leads to monotonous and homogenized product appearances. To enhance product value, surface coloring of glassware has become a common process. Among these methods, painting the inside of the glassware, compared to painting the outside, achieves a unique and irreplaceable decorative effect: firstly, light passes through the glass and paint layer and is reflected or transmitted, creating a transparent texture and rich light and shadow layers. Using semi-transparent or gradient paints can further enhance the sophisticated visual art effect. Secondly, the inner paint surface avoids frequent contact and friction with hands, tabletops, and cleaning tools during use, making it far more wear-resistant and durable than outer paint, especially suitable for tableware that needs to be used repeatedly.

[0003] Despite the significant advantages of the internal painting process, a series of severe technical challenges remain in actual industrial production, especially in achieving efficient and high-quality painting of the most common round-mouthed cylindrical glass cups. These challenges are mainly reflected in the following aspects: 1. Defect Magnification and Detection Interference Caused by Transparent Materials and Cylindrical Structures: Glass has high light transmittance and an inert silicon-oxygen bond structure on its surface. The inner wall of a cylinder is a continuous curved surface. This characteristic causes any minute defects generated during the painting process, such as uneven paint film thickness, localized missed spraying, runs, or pinholes and bubbles, to be extremely magnified by the transmission and refraction of the transparent medium. These defects are clearly visible to the naked eye, leading to low product pass rates. More problematic is that the transparent glass surface reflects fixed ambient light sources (such as factory lights or window light), creating strong ambient light images at specific angles. These reflected light spots can obscure the true condition of the paint surface underneath, causing some defective products to go undetected at fixed observation points. To find a non-reflective observation angle that avoids glare and allows for clear viewing of defects, operators often spontaneously stay in one position for extended periods. This not only limits the detection points but also exposes them to harmful paint fumes due to prolonged close proximity to the painting station, increasing health risks. If the conventional solution of adding a transparent observation window is adopted, the double reflection of the observation window glass and the glass of the cup will cause serious ghosting, further interfering with visual judgment.

[0004] 2. The contradiction between paint mist pollution and low utilization rate in open-plan work environments: To achieve multi-angle detection, painting equipment often needs to maintain an open or semi-open layout, which directly leads to a large amount of atomized paint particles (approximately 5-50 μm in diameter) scattering into the workshop environment. In existing technologies, the effective adhesion rate of paint is usually only 30-40%, with the majority becoming a source of pollution. This not only contaminates equipment and the site, resulting in high cleaning costs, but also endangers the respiratory health of operators. Scattered paint also means a serious waste of raw materials, directly increasing production costs.

[0005] 3. The severe impact of ambient humidity on paint film quality: In a partially enclosed environment, workshop humidity (especially above 60%) is difficult to control. During transport, atomized paint easily mixes with moisture in the air, forming an oil-in-water emulsion. Simultaneously, a hidden water film may condense on the low-temperature surface of the glass. These two factors severely hinder the effective adsorption and bonding of the paint to the inert glass surface, leading to defects such as whitening, blistering, and pinholes in the paint film. This significantly reduces adhesion, causing the paint to easily peel off in large sheets during subsequent tests. In humid seasons, the scrap rate can soar by more than 30%.

[0006] 4. Challenges in controlling the uniformity of paint spraying on the inner wall of a cylindrical cup: When spraying paint from the rim inwards, due to gravity, the atomized paint naturally tends to deposit at the bottom of the cup, resulting in a thinner paint film on the inner wall of the cylindrical cup and an excessively thick paint film at the bottom. This makes it difficult to achieve a uniform color effect and affects the decorative quality.

[0007] In summary, the current industry of spray painting the inside of transparent glass cups urgently needs an innovative solution. This solution must effectively contain paint mist, protect personnel health and environmental cleanliness, create a low-humidity localized working environment to ensure paint film adhesion quality, and should not hinder, or even assist, operators in clearly and undisturbedly observing the paint surface from multiple angles to detect defects. It also needs to improve paint utilization and spray uniformity. In existing technologies, simply using fully enclosed equipment introduces observation interference and is not conducive to heat dissipation and dehumidification, while adding complex machine vision inspection systems is costly and unsuitable for the needs of most manufacturing enterprises. Therefore, how to comprehensively resolve the contradictions between spray painting quality, environmental protection, health protection, and efficient inspection under the premise of low cost has become a prominent technical challenge in this field. Summary of the Invention

[0008] To address the aforementioned problems, this application provides a spray painting and coloring device for transparent glass cups.

[0009] A spray painting device for transparent glass cups, characterized in that it includes a base, on which a rotating mechanism, a spraying mechanism, and an air jet assembly are integrated; the rotating mechanism includes a rotating disk and several cup holders fixed on the rotating disk; the spraying mechanism includes a spray nozzle facing the cup holder; the air jet assembly includes an air jet seat and an air outlet, the air outlet being distributed in a ring around the spray nozzle to form an air curtain around the spray nozzle.

[0010] By adopting the above technical solution, the air curtain can initially isolate the painting area from the external environment, forcing most of the paint mist to move towards the cup opening, thereby significantly reducing the diffusion of paint into open spaces, reducing environmental pollution and material waste, and providing operators with a healthier working environment.

[0011] Furthermore, the rotating disc has air inlets corresponding to each cup holder, and the air inlets are adapted to the air curtain structure to form a directional airflow channel.

[0012] By adopting the above technical solution, the upper air curtain and the lower air intake together form a top-down directional airflow channel. This channel can efficiently capture and guide residual paint mist that is not collected by the cup opening, forcibly drawing it away from the painting area, further curbing the disorderly diffusion of paint mist and improving the paint recycling rate.

[0013] Furthermore, the rotating mechanism also includes a driving device, which is connected to the rotating disk in a transmission manner, driving the rotating disk to align the cup holder with the paint spray head.

[0014] By adopting the above technical solution, the drive device can precisely control the intermittent or continuous rotation of the rotary table, so that each cup holder can move sequentially and accurately to the preset position below the paint spray head, realizing automatic feeding and positioning of glass cups, and improving production efficiency and consistency of paint spraying position.

[0015] Furthermore, the base has an assembly groove corresponding to the rotating disk, the rotating disk is embedded in the assembly groove and spaced from the bottom of the groove, forming an adsorption cavity, and the adsorption cavity is connected to the air intake.

[0016] By adopting the above technical solution, the adsorption chamber acts as a centralized negative pressure source, connected to the air inlets below all the cup holders through channels inside the rotating disk. This integrated design is compact, ensuring that each workstation receives stable and uniform suction, effectively maintaining the efficiency of the directional airflow channel.

[0017] Furthermore, it also includes a purification device, which is connected to the adsorption chamber via a gas guiding structure.

[0018] By adopting the above technical solution, the paint mist-containing gas collected from the adsorption chamber is introduced into the purification device for treatment, avoiding the direct emission of harmful gases. This not only protects the overall workshop environment but also allows for the recovery of paint particles, embodying the concept of clean production.

[0019] Furthermore, the purification device includes a gas drying mechanism and a filtration mechanism to dry the gas and filter paint particles.

[0020] By adopting the above technical solutions, the filtration mechanism can effectively capture and recover paint particles in the airflow. The drying mechanism can reduce the humidity of the gas, and the treated dry gas can be recycled to form an air curtain, thereby creating a localized low-humidity drying area around the paint spray head, blocking ambient moisture, and significantly improving paint film adhesion and surface quality.

[0021] Furthermore, the device has a three-sided open layout, with at least three sides having an unobstructed structure.

[0022] By adopting the above technical solution, operators can freely approach and observe the glass during the painting process from multiple directions, including left, right, and front. By flexibly moving to find the best viewing angle, interference from ambient light reflection on the glass surface can be effectively avoided, and paint film defects can be clearly identified, solving the detection problems caused by multiple reflections and fixed positions in enclosed equipment.

[0023] Furthermore, each of the cup holders is equipped with an independent rotation drive, which is connected to the cup holder in a transmission manner.

[0024] By adopting the above technical solution, during painting, the self-rotating drive component drives the cup holder and glass to rotate at high speed around their own axis. The tangential force and centrifugal force generated by the rotation work together to evenly throw the atomized paint entering the cup onto the entire cylindrical inner wall, effectively overcoming the paint deposition problem caused by gravity and achieving uniform painting.

[0025] Furthermore, the inner wall of the cup holder is provided with an elastic anti-slip structure to prevent the glass from shifting when the cup holder rotates.

[0026] By adopting the above technical solution, the elastic anti-slip structure increases the friction between the cup holder and the glass, ensuring that there is no relative sliding between the glass and the cup holder during high-speed rotation. This ensures that the rotational power is stably and efficiently transmitted to the glass, which is a key guarantee for achieving uniform paint spraying.

[0027] Furthermore, the air outlet is inclined toward the glass or perpendicular to the rotating disk, and the air jet seat is coaxially arranged with the paint spray head.

[0028] By adopting the above technical solution, tilting the air outlet towards the glass creates a downward-converging air curtain, better guiding the paint mist towards the rim of the glass; vertically downward, it forms a columnar barrier. The coaxial arrangement of the air jet seat and the paint spray head ensures the symmetry of the air curtain surrounding the paint spray head, making the constraint force field uniform and stable, and preventing paint mist from deflecting due to asymmetrical airflow.

[0029] In summary, this application includes at least one of the following beneficial technical effects: 1. The air curtain formed by the jet assembly and the directional airflow channel formed by the rotating disk suction port effectively constrain and recover atomized paint, greatly reducing scattered pollution, improving paint utilization, and protecting the health of operators.

[0030] 2. By utilizing the independent rotation function of the cup holder, combined with the tangential force and centrifugal force generated by the rotation, uniform paint spraying is achieved on the cylindrical inner wall of the transparent glass cup, improving the decorative quality of the product.

[0031] 3. The three-sided open layout allows operators to observe the painting process from multiple angles without interference, enabling timely detection of defects. At the same time, the dry gas provided by the purification device creates a localized low-humidity environment in the painting area, improving paint film adhesion and comprehensively solving the quality and inspection challenges in an open environment. Attached Figure Description

[0032] Figure 1 This is a perspective view of this embodiment, mainly showing its overall structure; Figure 2 The main exhibits are paint spray nozzles and air jet mounts; Figure 3 The main exhibits are the cup holders and the air intake. Figure 4 The main focus is on the adsorption chamber.

[0033] Explanation of reference numerals in the attached drawings: 101, assembly slot; 102, adsorption chamber; 21, paint spray head; 31, rotating disk; 311, cup holder; 312, air intake; 41, driving component; 51, jet seat; 52, air outlet. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings.

[0035] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] To address the multiple industry challenges faced when spraying paint onto the inside of transparent glass cups, including easily magnified paint film defects, interference from ambient light during detection, paint scattering and waste, and the impact of ambient humidity on adhesion, this application provides an innovative spray painting device. The core design concept of this device lies in creating a locally controlled microenvironment to confine the paint and isolate moisture, while keeping the device open for multi-angle observation, and utilizing the cup's rotation to optimize paint film uniformity.

[0037] This equipment includes a base that serves as the fundamental support structure. (Refer to...) Figure 1 and Figure 2 The base houses and integrates all other functional modules. A key feature of the overall layout is that, to facilitate operators' observation of the transparent glass from multiple angles and avoid blind spots and health risks caused by fixed positions, the equipment features a three-sided open layout. This means that, apart from the necessary supporting back, there are no obstructions on at least three sides: left, right, and front. Obstructions such as large enclosed casings or observation windows provide ample space for workers to move flexibly and find the optimal observation angle.

[0038] Reference Figure 1 and Figure 2 A rotating mechanism is installed on the base. The core of this mechanism is a rotating disk 31, which performs intermittent or continuous circular motion in a horizontal plane. Multiple cup holders 311 for positioning and supporting glass cups are fixed on the rotating disk 31. To drive the rotating disk 31, the rotating mechanism also includes a drive device, preferably a stepper motor with a reducer. This drive device is connected to the rotating disk 31 and can precisely drive the rotating disk 31 to rotate, thereby sequentially conveying the different cup holders 311 and the glass cups on them to the painting station for accurate alignment with the paint spray head 21.

[0039] Reference Figure 2 and Figure 4Furthermore, to achieve better paint uniformity, each cup holder 311 is also equipped with an independent rotation drive 41, preferably a motor. This rotation drive 41 is connected to the cup holder 311 and can drive the cup holder 311 to rotate at high speed around its own axis. To prevent the glass from slipping or shifting during rotation, the inner wall of the cup holder 311 is provided with an elastic anti-slip structure, such as a silicone sleeve or evenly distributed protrusions, to increase friction and ensure that the glass rotates synchronously and stably with the cup holder 311.

[0040] Reference Figure 2 and Figure 4 The painting mechanism is fixedly mounted on the base and located above or to the side of the painting station. Its execution end is the paint spray head 21, which is precisely positioned towards the cup holder 311 below or to the side, with its spray axis aligned with the center of the glass rim, for spraying atomized paint into the inside of the rim.

[0041] Reference Figure 2 and Figure 4 To constrain the atomized paint sprayed from the spray head 21 and reduce scattering, this device is equipped with an air jet assembly. The air jet assembly includes an air jet seat 51, which surrounds the spray head 21. Multiple air outlets 52 are formed on the air jet seat 51. These air outlets 52 are arranged in a ring around the spray head 21. The spray direction of the air outlets 52 can be designed as needed. In this embodiment, it can be set to tilt towards the glass to better guide the airflow downwards; or it can be set to be perpendicular to the surface of the rotating disk 31 downwards. Regardless of the direction, the air jet seat 51 and the spray head 21 need to be coaxially arranged to ensure the symmetry of the air curtain. When high-pressure gas is ejected from these air outlets 52, a downward or enveloping cylindrical air curtain is formed around the spray head 21. The main function of this air curtain is to push the atomized paint particles attempting to scatter laterally towards the mouth of the glass, thus constraining and guiding them.

[0042] Reference Figure 2 and Figure 3 To effectively collect residual paint mist that is not captured by the cup opening and prevent it from polluting the environment, this device constructs a directional airflow channel. Specifically, on the rotating disk 31, an air intake 312 is provided corresponding to the position of each cup holder 311. When the cup holder 311 rotates to the painting station, the air intake 312 below it is located directly below the paint spray head 21. This air intake 312 is spatially adapted to the air curtain formed by the upper air jet seat 51, jointly guiding the airflow from top to bottom. The dry gas ejected from the air outlet 52, after forming an air curtain and constraining the paint mist, is finally drawn into the lower air intake 312 carrying the residual paint mist.

[0043] By controlling the flow rate of the gas ejected from the jet seat 51 and the speed of the paint mist ejected from the paint spray head 21, both are set within a reasonable range. In this embodiment, the air curtain airflow velocity is designed to be 60%-80% of the paint flow velocity. This avoids excessively fast airflow velocity, which could trigger a significant Bernoulli effect. It also provides a following and enveloping effect for the airflow, preventing high-speed airflow from passing by and keeping the airflow velocity difference within a safe range. The airflow velocity and paint mist pressure difference are weak, and the direction is towards the glass, forming an auxiliary force to push the paint mist. Under the guidance of the overall directional airflow channel and the pull of the negative pressure at the suction port 312, it is ensured that the paint is constrained and directed to the target area.

[0044] Reference Figure 4 To accommodate the rotating disk 31 and create a negative pressure adsorption space, a mounting groove 101 is provided on the base corresponding to the position of the rotating disk 31. The rotating disk 31 is embedded in the mounting groove 101, with its base maintaining a certain distance from the bottom of the mounting groove 101, thereby forming a closed adsorption cavity 102 below the rotating disk 31. The air inlets 312 below all the cup holders 311 are connected to this adsorption cavity 102 either through the channels inside the rotating disk 31 or directly.

[0045] Reference Figure 1 To handle the air containing paint mist and moisture collected from the adsorption chamber 102, this device also includes a purification unit employing conventional techniques. In this embodiment, the purification unit is connected to the adsorption chamber 102 via pipes and a fan, responsible for providing suction and purifying the gas. The purification unit includes at least a gas drying mechanism and a filtration mechanism. The filtration mechanism uses a multi-layer filter element in conjunction with a paint mist filter to capture and filter paint particles in the air, achieving paint recovery and air purification; the drying mechanism uses a condenser to reduce the humidity of the gas. The purified and dried gas can be recycled back to the jet seat 51 or discharged outdoors. Importantly, this portion of the gas recycled to the jet seat 51 is dry, ensuring that the formed air curtain is a low-humidity, dry area, effectively isolating external ambient moisture and preventing it from contacting the atomized paint.

[0046] The implementation principle of this application embodiment is as follows: During painting, the jet assembly sprays dried gas, forming an annular drying air curtain around the paint spray head 21. This air curtain, on the one hand, constrains and guides the laterally scattered atomized paint to the cup opening, significantly reducing paint leakage, protecting worker health, and improving utilization. On the other hand, the drying air curtain creates a localized low-humidity environment in the painting area, effectively blocking external ambient moisture and preventing moisture from mixing with paint or condensing on the glass surface, thereby avoiding problems such as paint film whitening, blistering, and decreased adhesion.

[0047] Residual paint mist that is not captured by the cup opening is drawn in by the negative pressure generated by the suction port 312 on the rotating disk 31 under the guidance of the air curtain, and enters the purification device through the adsorption chamber 102. The purification device first filters and recovers paint particles, and then dries the gas. The dried clean gas can be recycled to the jet seat 51 for use, forming a local gas circulation purification system, realizing the recovery of paint particles and environmental protection.

[0048] During painting, the cup holder 311 is driven to rotate at high speed by the self-rotating drive component 41. As the glass rotates, its cylindrical inner wall undergoes circular motion, exerting an effect on the air inside the cup and the sprayed atomized paint particles. After the paint particles enter the cup with a certain initial velocity, due to inertia, there is a velocity difference between their direction of motion and the tangential direction of the rotating inner wall. The inner wall applies a continuous tangential force to the particles through friction and collision, giving the particles tangential acceleration, thus causing them to rotate in the same direction as the inner wall. At the same time, the centrifugal force generated by the rotating system pushes the particles radially towards the cup wall. In this process, the tangential force causes the particles to spread circumferentially along the inner wall, and the centrifugal force ensures that the particles adhere to the inner wall. Together, they throw the paint onto the entire inner surface of the cylinder, achieving uniform adhesion.

[0049] The open design with unobstructed views on three sides allows operators to move freely and observe the transparent cup from different angles. By flexibly changing the viewing angle, the non-reflective position with minimal ambient light reflection interference can be found, clearly identifying minute defects such as uneven paint film thickness, runs, and bubbles. This solves the problems of blind spots in fixed-station observation and multiple reflection interference caused by traditional enclosed equipment (with observation windows). This design ensures inspection effectiveness while avoiding the investment of expensive high-definition camera inspection systems, adapting to production needs of varying precision.

[0050] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A spray painting and coloring device for transparent glass cups, characterized in that, The device includes a base, on which a rotating mechanism, a painting mechanism, and an air jet assembly are integrated; the rotating mechanism includes a rotating disk (31) and several cup holders (311) fixed on the rotating disk (31); the painting mechanism includes a paint spray head (21) facing the cup holder (311); the air jet assembly includes an air jet seat (51) and an air outlet (52), the air outlet (52) being distributed in a ring around the paint spray head (21) to form an air curtain around the paint spray head (21).

2. The spray painting and coloring equipment for a transparent glass cup according to claim 1, characterized in that, The rotating disk (31) has an air inlet (312) at each cup holder (311). The air inlet (312) is adapted to the air curtain structure and forms a directional airflow channel.

3. The spray painting and coloring equipment for a transparent glass cup according to claim 1, characterized in that, The rotating mechanism also includes a driving device, which is connected to the rotating disk (31) for transmission, and drives the rotating disk (31) to align the cup holder (311) with the paint spray head (21).

4. The spray painting and coloring equipment for a transparent glass cup according to claim 2, characterized in that, The base has an assembly groove (101) corresponding to the rotating disk (31). The rotating disk (31) is embedded in the assembly groove (101) and spaced from the bottom of the groove, forming an adsorption cavity (102). The adsorption cavity (102) is connected to the air intake (312).

5. The spray painting and coloring equipment for a transparent glass cup according to claim 4, characterized in that, It also includes a purification device, which is connected to the adsorption chamber (102) through a gas guiding structure.

6. The spray painting and coloring equipment for a transparent glass cup according to claim 5, characterized in that, The purification device includes a gas drying mechanism and a filtration mechanism to dry the gas and filter paint particles.

7. The spray painting and coloring equipment for a transparent glass cup according to claim 1, characterized in that, The device has a three-sided open layout, with at least three sides having an unobstructed structure.

8. The spray painting and coloring equipment for a transparent glass cup according to claim 1, characterized in that, Each of the cup holders (311) is equipped with an independent rotation drive (41), which is connected to the cup holder (311) in a transmission manner.

9. The spray painting and coloring equipment for a transparent glass cup according to claim 8, characterized in that, The inner wall of the cup holder (311) is provided with an elastic anti-slip structure to prevent the glass from shifting when the cup holder (311) rotates.

10. The spray painting and coloring equipment for a transparent glass cup according to claim 1, characterized in that, The air outlet (52) sprays air in a direction that is tilted toward the glass or perpendicular to the rotating disk (31), and the air outlet seat (51) is arranged coaxially with the paint spray head (21).

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