A spraying device for obtaining a high flatness appearance

Abstract

This invention provides a spraying apparatus for achieving a high degree of smoothness in appearance. The apparatus includes a spray gun assembly, a scraper, and a squeegee. The scraper has a tapered through-hole, with the larger diameter end of the tapered through-hole facing the spray gun assembly and the smaller diameter end facing the surface to be sprayed. The blade of the squeegee abuts against the inner wall of the scraper. The squeegee and the scraper are rotatable relative to each other. Preferably, the extension length of the blade of the squeegee is substantially the same as the generatrix length of the tapered through-hole forming the inner wall of the scraper, so as to thoroughly clean the adhesive adhering to the inner wall of the scraper during spraying. The spraying apparatus of this invention effectively blocks excess sprayed adhesive mist by providing a scraper at the outlet end of the spray gun assembly, ensuring uniform adhesive application during spraying at a set spray height.

Description

Technical Field

[0001] This invention belongs to the technical field of vehicle painting equipment, specifically relating to a painting device for obtaining a high degree of smoothness in appearance. Background Technology

[0002] When applying sealant to automotive door sills, traditional glue guns use frequency converters and motors to drive the application, resulting in extremely high procurement costs, a high failure rate of the electronic control unit, and extremely poor spray smoothness. This leads to a decrease in the corrosion resistance and aesthetics of the vehicle's exterior surface, resulting in a poor visual experience for customers. Some companies use manual spraying or add auxiliary devices, which are of poor quality and low efficiency. In current industrial applications, the smoothness error of manual spraying exceeds ±0.5mm, and the smoothness error of electric glue guns also exceeds ±0.1mm, which is not conducive to achieving a good smoothness of the car door appearance.

[0003] Invention Patent Content

[0004] To address the aforementioned problems, this invention provides a spraying apparatus for achieving a high degree of smoothness in the finish. By applying this apparatus, high-quality automotive door sill sealant with extremely low spraying error and excellent surface smoothness can be obtained. The objective of this invention is achieved through the following technical solution:

[0005] This invention provides a spraying apparatus for achieving a high degree of smoothness, comprising a spray gun assembly, a scraper, and a scraper blade. The scraper has a tapered through-hole, with the larger diameter end of the tapered through-hole facing the spray gun assembly and the smaller diameter end facing the surface to be sprayed. The blade of the scraper blade abuts against the inner wall of the scraper, and the scraper blade and the scraper are rotatable relative to each other. Preferably, the extension length of the blade of the scraper blade is substantially the same as the generatrix length of the tapered hole forming the inner wall of the scraper, so as to thoroughly clean the adhesive adhering to the inner wall of the scraper during spraying.

[0006] Furthermore, it also includes a fixed base and a scraper base. The spray gun assembly, the scraper base, and the scraper blade are all supported and fixed by the fixed base. The scraper is connected to the scraper base in a manner that allows it to rotate around its axis.

[0007] Furthermore, it also includes a driving device, which includes a drive motor and a transmission device. The drive motor is connected to the scraper through the transmission device, and the scraper rotates at a constant speed under the drive of the drive motor.

[0008] Furthermore, the transmission device includes a transmission gear, and the outer wall of the scraper has an external gear assembly. The transmission gear meshes with the external gear assembly for transmission. Preferably, the drive motor is a pneumatic motor. The transmission gear is driven to rotate by the drive motor, thereby driving the external gear assembly meshing with it to move and realize the scraper rotating around its axis.

[0009] Furthermore, the scraper base includes a first base and a second base. The scraper has a groove extending circumferentially on the outer wall of its large diameter end. The first base and / or the second base are provided with a slide rail adapted to the groove. The scraper is connected to the scraper base by fitting its groove in the slide rail.

[0010] Furthermore, the first base is provided with a first slide rail, the second base is provided with a second slide rail, there is a circumferential gap between the first base and the second base, and a tension adjustment device for adjusting the circumferential gap is provided between the first base and the second base.

[0011] Furthermore, the tension adjustment device includes an adjustment bolt and a tension spring sleeved on the adjustment bolt, wherein the tension spring has a stiffness coefficient adapted to the adjustment requirements.

[0012] Furthermore, the spray gun assembly includes a spray gun body and a spray gun direction adjuster, the spray gun direction adjuster being used to adjust the axial and radial distances of the spray gun body relative to the scraper and the relative tilt angle between the spray gun nozzle and the inner wall of the scraper.

[0013] Furthermore, the spray gun direction adjuster includes a fixed arm and a support arm. The fixed arm is fixed by a fixed base, and the support arm is connected between the fixed arm and the spray gun body. The fixed arm has a first elongated hole extending in the radial direction of the scraping. The support arm has a second elongated hole arranged at an angle to the first elongated hole and a plurality of fixed connection holes. The support arm is connected to the fixed arm by a fixing bolt passing through one of its multiple fixed connection holes and the first elongated hole. The spray gun body is fixed by a bolt passing through the second elongated hole.

[0014] Furthermore, the scraper disc is made of metal, and the scraper blade is made of metal sheet or rubber.

[0015] The beneficial effects of this invention are as follows:

[0016] (1) The spraying device of the present invention can effectively block excess spraying adhesive mist by setting a scraper for blocking adhesive mist at the outlet end of the spray gun assembly, so as to ensure the uniformity of adhesive application during the spraying process when spraying at a set height.

[0017] (2) By setting a scraper blade on the inner wall of the scraper and rotating the scraper blade relative to the scraper blade, the adhesive adhering to the inner wall of the scraper can be scraped off in time, ensuring the spraying accuracy.

[0018] (3) The spray gun direction adjuster allows the distance between the nozzle and the scraper and the spray angle of the spray gun body to be adjusted according to specific spraying needs, effectively improving the accuracy and reliability of spraying control. Attached Figure Description

[0019] Figure 1 The diagram shown is a schematic representation of a spraying apparatus according to a preferred embodiment of the present invention;

[0020] Figure 2 The diagram shown is a schematic representation of the spraying apparatus of a preferred embodiment of the present invention from another angle.

[0021] Figure 3 The diagram shown is a schematic representation of the spraying apparatus of a preferred embodiment of the present invention from another angle.

[0022] Figure 4 The diagram shown is a schematic representation of the spraying device in use according to a preferred embodiment of the present invention.

[0023] Figure 5 The diagram shown is a schematic representation of the spraying process of a preferred embodiment of the spraying apparatus of the present invention.

[0024] Figure 6 The diagram shows the adhesive spraying path of the spray gun body of the spraying device of the present invention. Detailed Implementation

[0025] The preferred embodiment of the spraying apparatus for obtaining a high degree of smoothness in the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that in the following description, the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, in the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] This embodiment provides a spraying device for achieving a high degree of smoothness, comprising a fixed base 230, a scraper base, a spray gun assembly 100, a drive device 500, a scraper 310, and a scraper blade 320. The spray gun assembly, scraper base, and scraper blade are all supported and fixed by the fixed base. Figure 1As shown, the spray gun assembly 100 includes a spray gun body and a spray gun direction adjuster. The spray gun body includes a main needle valve 101 and a spray gun nozzle 102. The auxiliary valve 101 is used to control the on / off switch of PVC adhesive material spraying, using a start-up control method, which can be a two-position four-way valve or a single-air-path control (with a main needle valve with a built-in spring reset function). The spray gun nozzle 102 is used to shape the PVC adhesive passing inside the spray gun into a fan-shaped atomized shape before spraying. The spray gun direction adjuster is used to adjust the axial and radial distances of the spray gun body relative to the scraper 310 and the relative tilt angle between the spray gun nozzle 102 and the inner wall of the scraper. Specifically, the spray gun direction adjuster includes a fixed arm 120 and a support arm 110. The fixed arm 120 is fixed by a fixed base 230, and the support arm 110 is connected between the fixed arm 120 and the spray gun body. The fixed arm 120 is provided with a first elongated hole 121 extending in the radial direction of the scraping. The support arm 110 is provided with a second elongated hole 111 arranged at an angle to the first elongated hole 121 and a plurality of fixed connection holes 112 (shown as three fixed connection holes 112 in the figure). The support arm 110 is fixedly connected to the fixed arm 120 by a fixing bolt passing through one of its multiple fixed connection holes 112 and the first elongated hole 121. The spray gun body is fixed by a bolt passing through the second elongated hole 111. The scraper 310 has a tapered through hole, with the larger diameter end of the tapered through hole facing the spray gun assembly 100 and the smaller diameter end facing the surface to be sprayed. The blade of the scraper 320 abuts against the inner wall of the scraper 310. The scraper is connected to the scraper base in a manner that allows it to rotate around its axis. The driving device 500 includes a drive motor and a transmission device. The drive motor is connected to the scraper via the transmission device, and the scraper 310 rotates at a uniform speed under the drive of the drive motor. When using the spraying device of the present invention for adhesive application, the scraper 310 is used to neatly block the upper layer of atomized PVC adhesive sprayed from the spray gun nozzle 102. Excess adhesive mist is blocked by the scraper 310 and adheres to the inner wall of the scraper to form intercepted adhesive P1, so that the adhesive receiving surface can receive the target adhesive P2 of a preset thickness, thereby achieving precise positioning of the spraying position on the adhesive receiving surface.

[0028] In the spraying device of the present invention, the adhesive supply process is as follows: PVC adhesive passes through a flow meter and a pressure regulating valve to the main needle valve 101 and the spray gun nozzle 102 for adhesive application (e.g., ...). Figure 6 (As shown); The re-resin process is as follows: PVC glue passes through a flow meter and pressure regulating valve, then enters a check valve and finally a circulation valve to enter the circulation process (as shown). Figure 6(As shown). Principle of scraper 310: After passing through the main needle valve 101 and the spray gun nozzle 102, the PVC glue is atomized and sprayed out. After being blocked by the upper edge of the scraper 310, the remaining PVC glue is sprayed onto the car body to form the target glue coating P2. The residual PVC glue adheres to the inner wall of the scraper 310 to form the intercepted glue coating P1, and is then scraped into the waste glue bucket by the glue scraper blade 320.

[0029] In a preferred embodiment, a flow guide groove or other structure can be further provided on the scraper 310 so that the intercepted adhesive P1 can flow into the external waste adhesive recycling device under the action of the scraper blade 320, thereby achieving the function of automatic collection of waste adhesive.

[0030] In a preferred embodiment, the scraper 310 is made of metal to take advantage of its excellent wear resistance. During use, the scraper 310 is usually kept rotating at a constant speed to transfer the trapped adhesive P1 formed by the masking sprayed adhesive mist in a timely manner.

[0031] In the illustrated embodiment, the transmission device adopts gear transmission. The output end of the drive motor is connected to the transmission gear 501. The outer wall of the scraper 310 has an external gear assembly 311. The transmission gear 501 meshes with the external gear assembly 311 for transmission. Preferably, the drive motor is a pneumatic motor. The starting speed of the motor is determined by the air pressure. The transmission gear 501 is driven by the drive motor to rotate, thereby driving the external gear assembly that meshes with it to move, so that the scraper rotates around its axis, so that the scraper blade 320 can scrape off the tack glue P1 that is attached to the inner wall of the scraper 310 during spraying.

[0032] In the illustrated embodiment, to facilitate the support and rotation of the scraper, the scraper base includes a first base 210 and a second base 220, as shown below. Figure 3 and Figure 4 As shown, the scraper 310 has a circumferentially extending groove 312 on its outer wall at its large-diameter end. The first base 210 and the second base 220 are provided with arc-shaped slide rails adapted to the grooves. The scraper 310 is connected to the scraper base by fitting its groove into the slide rails. Preferably, the scraper blade 320 is made of a metal sheet with good toughness or a rubber material with medium strength.

[0033] In the illustrated embodiment, to facilitate adjustment of the scraper rotation speed and scraper fastening state, a first slide rail is provided on the first base 210, and a second slide rail is provided on the second base 220. A circumferential gap exists between the first base 210 and the second base 220. A tension adjustment device 240 for adjusting the circumferential gap is provided between the first base and the second base. Figure 3 and Figure 4As shown, the tension adjustment device 240 includes an adjustment bolt 241 and a tension spring 242 sleeved on the adjustment bolt. The tension spring 242 has a stiffness coefficient that adapts to the adjustment requirements.

[0034] In other embodiments, the scraper can be set to a structure in which the scraper is relatively fixed and the scraper blade rotates. As long as the relative rotation of the scraper blade and the scraper can be achieved, so that the blade of the scraper blade is attached to the inner wall of the scraper to achieve the purpose of scraping off and retaining the adhesive P1, it is acceptable.

[0035] In a preferred embodiment, the blade extension length of the scraper 320 is approximately the same as the generatrix length of the tapered hole forming the inner wall of the scraper 310, and the blade of the scraper 320 moves close to the inner wall of the scraper 310 so as to thoroughly clean the adhesive adhering to the inner wall of the scraper during spraying, ensuring that the target adhesive P2 sprayed on the adhesive receiving surface has a preset uniform thickness.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention; the dimensions described in the drawings and embodiments are not related to the specific physical object and are not used to limit the protection scope of the present invention. The physical dimensions can be selected and changed according to actual needs.

Claims

1. A spraying apparatus for obtaining a high degree of smoothness in appearance, characterized in that, The system includes a spray gun assembly, a scraper, a squeegee, a mounting base, and a scraper base. The spray gun assembly, scraper base, and squeegee are all supported and fixed by the mounting base. The scraper has a tapered through-hole, with the larger diameter end of the tapered through-hole facing the spray gun assembly and the smaller diameter end facing the surface to be sprayed. The scraper is connected to the scraper base in a manner that allows it to rotate about its axis. The scraper base includes a first base and a second base. The scraper has a circumferentially extending channel on its outer wall at its larger diameter end. The first base and / or the second base has a groove adapted to the channel. The scraper disc is connected to the scraper disc base by means of its groove fitting in the slide rail; a first slide rail is provided on the first base, and a second slide rail is provided on the second base, with a circumferential gap between the first base and the second base; a tension adjustment device for adjusting the circumferential gap is provided between the first base and the second base; the tension adjustment device includes an adjusting bolt and a tension spring sleeved on the adjusting bolt, the tension spring having a stiffness coefficient adapted to the adjustment requirements; the blade of the scraper blade abuts against the inner wall of the scraper disc, and the scraper blade and the scraper disc can rotate relative to each other.

2. The spraying apparatus for obtaining a high degree of smoothness according to claim 1, characterized in that, It also includes a drive device, which includes a drive motor and a transmission device. The drive motor is connected to the scraper through the transmission device, and the scraper rotates at a constant speed under the drive of the drive motor.

3. The spraying apparatus for obtaining a high degree of smoothness according to claim 2, characterized in that, The transmission device includes a transmission gear, and the outer wall of the scraper has an external tooth assembly, which meshes with the transmission gear to drive the transmission.

4. A spraying apparatus for obtaining a high degree of smoothness according to any one of claims 1 to 3, characterized in that, The spray gun assembly includes a spray gun body and a spray gun direction adjuster. The spray gun direction adjuster is used to adjust the axial and radial distances of the spray gun body relative to the scraper and the relative tilt angle between the spray gun nozzle and the inner wall of the scraper.

5. A spraying apparatus for obtaining a high degree of smoothness in appearance according to claim 4, characterized in that, The spray gun direction adjuster includes a fixed arm and a support arm. The fixed arm is fixed by a fixed base, and the support arm is connected between the fixed arm and the spray gun body. The fixed arm has a first elongated hole extending in the radial direction of the scraping. The support arm has a second elongated hole arranged at an angle to the first elongated hole and a plurality of fixed connection holes. The support arm is connected to the fixed arm by a fixing bolt passing through one of its multiple fixed connection holes and the first elongated hole. The spray gun body is fixed by a bolt passing through the second elongated hole.

6. A spraying apparatus for obtaining a high degree of smoothness according to any one of claims 1 to 3, characterized in that, The scraper disc is made of metal, and the scraper blade is made of metal sheet or rubber.

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