CN113231289A

CN113231289A - Plastic spraying method and system for lamp structural member

Info

Publication number: CN113231289A
Application number: CN202110516402.7A
Authority: CN
Inventors: 程爱群; 许礼; 郭惠民; 李闪
Original assignee: Pujiang Sansi Optoelectronics Technology Co Ltd
Current assignee: Pujiang Sansi Optoelectronics Technology Co Ltd
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2021-08-10

Abstract

The application provides a plastic spraying method and a system for a lamp structural member, wherein a surface treatment process comprises a degreasing sub-process and a surface film forming sub-process; wherein, the degreasing sub-process can remove oil stains and the like of the lamp structural member before the surface film forming; the surface film forming sub-process comprises a plurality of surface film forming sub-processes to correspond to the surface film forming of lamp structural members made of various metal materials, and the adhesion and the corrosion resistance of the sprayed coating are improved through the surface film forming. Therefore, the lamp structural member made of different metal materials can be subjected to surface treatment and plastic spraying by using one surface treatment conveying line, and the manufacturing cost is saved.

Description

Plastic spraying method and system for lamp structural member

Technical Field

The application relates to the technical field of manufacturing and processing, in particular to a plastic spraying method and system for a lamp structural member.

Background

The lamp structural member can be divided into a lamp post, an end cover, a lamp shell and a bracket of the lamp according to the structure, and is mainly made of metal materials, generally made of iron, aluminum, stainless steel and galvanized parts. The lamps using the lamp structural parts are mainly outdoor waterproof lamps or indoor decorative lamps, the structural part coatings in the general outdoor waterproof lamps need to have metal surface protection performances such as oxidation resistance, corrosion resistance and the like, and the structural part coatings in the indoor decorative lamps generally need to have appearance decoration.

Therefore, the lamp structural member is required to improve the adhesive force of the surface coating of the plastic spraying process, so that the coating with the protective performance on the surface of the structural member is not easy to scratch and scrape, the rusting caused by the scratch of the structural member coating of the outdoor lamp is prevented, and the appearance decoration service life of indoor lamps, such as table lamps, ceiling lamps and the like is also prolonged.

However, the lamp structural members are of too many kinds and different in production process, and further the lamp structural members may be rusted or full of oil stains before plastic spraying, and factors affecting adhesion such as silicone oil, wax and rust may exist in rolled workpieces, gaps and pinholes in the structural members. In addition, the lamp structural members are numerous, and can be divided into indoor and outdoor according to purposes, the lamp post, the end cover, the lamp housing and the support of the lamp can be divided according to the structure, and the lamp structural members can be divided into iron, aluminum, stainless steel and galvanized parts according to material classification.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, it is an object of the present application to provide a method and a system for plastic injection molding of structural parts of a lamp, which solve the problems of the prior art.

To achieve the above and other related objects, the present application provides a plastic injection molding method for a lamp structure, comprising: a surface treatment process comprising: a degreasing sub-process; and a surface film forming sub-process comprising: a first surface film forming procedure for forming a film on the surface of the lamp structural part made of the first type of metal material through an acidic passivation solution and performing acidic cleaning on the surface of the lamp structural part made of the second type of metal material; and a second surface film forming step of selectively using the second type metal material for forming a film on the surface of the lamp structural member made of the second type metal material by using a silane solution.

In some embodiments of the present application, the first type of metal material includes: aluminum-based and zinc-based materials; the second type metal material comprises: iron and stainless steel materials.

In some embodiments of the present application, the plastic injection method comprises at least one of: 1) the first surface film forming procedure adopts a mode of spraying a passivation solution on a lamp structural part; 2) the components of the passivation solution are 10% of phytic acid, 15% of silica sol, 70% of water and 5% of chromium nitrate; 3) the second surface film forming procedure adopts a mode of immersing the lamp structural part into silane solution; 4) the silane solution was prepared as follows 3: mixing a silane agent and water in a ratio of 100; the components of the silane agent are as follows: 40% of silane, 15% of graphene, 20% of complexing agent and 5% of water.

In some embodiments of the present application, the surface treatment process further includes, between the first surface film-forming process and the second surface film-forming process: a neutralization treatment process comprising: the surface of the lamp structure is treated by an alkaline neutralizing solution.

In some embodiments of the present application, the degreasing sub-process comprises at least one degreasing process: a pre-degreasing process comprising; degreasing the surface of the lamp structural member by spraying a pre-degreasing solution; a main degreasing step including; and degreasing the surface of the lamp structural member by immersing the lamp structural member in a main degreasing solution and ultrasonic waves.

In some embodiments of the present application, the pre-degreasing solution and the main degreasing solution contain a neutral degreasing agent, and the neutral degreasing agent comprises: 10% of sodium dodecyl benzene sulfonate, 10% of polyoxyethylene octyl phenol ether, 5% of ethylene glycol monobutyl ether and 75% of water; the pre-degreasing solution is a solution obtained by mixing the neutral degreasing agent and water according to the proportion of 3: 100; the main degreasing agent solution is a solution obtained by mixing the neutral degreasing agent and water according to the proportion of 1: 100.

In some embodiments of the present application, the surface treatment process further comprises: at least one washing step and a drying step after each washing step; the at least one washing process comprises at least one of the following: 1) the first washing process comprises the following steps: performing immersion water washing on the lamp structural part between the degreasing sub-process and the surface film forming sub-process; 2) and a second water washing process, which comprises the following steps: performing immersion water washing on the lamp structural part between adjacent surface film forming sub-processes in the surface film forming sub-processes; 3) the third washing process comprises the following steps: and after the surface film forming sub-process, carrying out spray type water washing on the lamp structural part.

In some embodiments of the present application, the plastic injection method further comprises: the plastic spraying process comprises the following steps: the method comprises a roasting process, an electrostatic plastic powder spraying process, a baking and solidifying process and a cooling process.

To achieve the above and other related objects, the present application provides a plastic injection molding system for a lamp structure, comprising: a surface treatment conveying line and a spraying conveying line are arranged in sequence; a surface treatment transfer line comprising: the first conveying mechanism is used for conveying the lamp structural part; the system comprises a first conveying mechanism, at least one degreasing tank, a first washing dipping tank, a first surface film forming spraying tank, a neutralizing solution dipping tank, a second washing dipping tank, a second surface film forming spraying tank, a third washing spraying tank and a first drying channel, wherein the degreasing tank, the first washing dipping tank, the first surface film forming spraying tank, the neutralizing solution dipping tank, the second washing dipping tank, the second surface film forming spraying tank, the third washing spraying tank and the first drying channel are sequentially arranged along the first conveying mechanism; the first surface film-forming spraying groove is used for forming a film on the surface of a lamp structural part made of a first type of metal material through an acidic passivation solution and performing acidic cleaning on the surface of a lamp structural part made of a second type of metal material; the second surface film-forming spraying groove is selectively started for the lamp structural part made of the second type of metal material, and is used for forming a film on the surface of the lamp structural part made of the second type of metal material through silane solution.

In some embodiments of the present application, the spray delivery line comprises: the second conveying mechanism is used for conveying the lamp structural parts transferred from the surface treatment conveying line; and a flame roasting area, a spraying area, a second drying channel and a circulating cooling area which are sequentially arranged along the second conveying mechanism.

In summary, the present application provides a plastic spraying method and system for a lamp structure, wherein a surface treatment process includes a degreasing sub-process and a surface film forming sub-process; wherein, the degreasing sub-process can remove oil stains and the like of the lamp structural member before the surface film forming; the surface film forming sub-process comprises a plurality of surface film forming sub-processes to correspond to the surface film forming of lamp structural members made of various metal materials, and the adhesion and the corrosion resistance of the sprayed coating are improved through the surface film forming. Therefore, the lamp structural member made of different metal materials can be subjected to surface treatment and plastic spraying by using one surface treatment conveying line, and the manufacturing cost is saved.

Drawings

Fig. 1 is a schematic flow chart illustrating a plastic injection molding method for a lamp structure according to an embodiment of the present disclosure.

Fig. 2 is a schematic flow chart of a surface film forming sub-process in an embodiment of the present application.

Fig. 3 is a schematic flow chart of a degreasing sub-process in an embodiment of the present application.

Fig. 4 is a schematic flow chart of a plastic spraying method incorporating a water washing process according to an embodiment of the present application.

Fig. 5 is a schematic flow chart of a plastic injection method including various steps of a specific plastic injection flow according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a plastic injection system for a lamp structure according to an embodiment of the present disclosure.

Detailed Description

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present application. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings so that those skilled in the art to which the present application pertains can easily carry out the present application. The present application may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present application, components that are not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

Throughout the specification, when a device is referred to as being "connected" to another device, this includes not only the case of being "directly connected" but also the case of being "indirectly connected" with another element interposed therebetween. In addition, when a device "includes" a certain component, unless otherwise stated, the device does not exclude other components, but may include other components.

When a device is said to be "on" another device, this may be directly on the other device, but may also be accompanied by other devices in between. When a device is said to be "directly on" another device, there are no other devices in between.

Although the terms first, second, etc. may be used herein to describe various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first interface and the second interface, etc. are described. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, acts or operations are inherently mutually exclusive in some way.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" include plural forms as long as the words do not expressly indicate a contrary meaning. The term "comprises/comprising" when used in this specification is taken to specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but does not preclude the presence or addition of other features, regions, integers, steps, operations, elements, and/or components.

Terms denoting relative space such as "lower", "upper", and the like may be employed to more easily describe a relationship of one device with respect to another device illustrated in the drawings. Such terms are intended to include not only the meanings indicated in the drawings, but also other meanings or operations of the devices in use. For example, if the device in the figures is turned over, elements described as "below" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "under" and "beneath" all include above and below. The device may be rotated 90 or other angles and the terminology representing relative space is also to be interpreted accordingly.

Although not defined differently, including technical and scientific terms used herein, all terms have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Terms defined in commonly used dictionaries are to be additionally interpreted as having meanings consistent with those of related art documents and the contents of the present prompts, and must not be excessively interpreted as having ideal or very formulaic meanings unless defined.

In view of the problems that the lamp structural member related to the above description has oil stains attached after being manufactured, and the lamp structural member has various metal materials and needs a corresponding number and types of surface treatment conveying lines, the embodiment of the present application may provide a plastic spraying method for the lamp structural member. The lamp structure includes but is not limited to: lamp pole, end cover, lamp body, or support etc.

Fig. 1 shows a schematic flow chart of a plastic injection method in the embodiment of the present application.

The plastic spraying method comprises a surface treatment process 11 and a plastic spraying process 12.

The surface treatment process 11 includes: a degreasing sub-process 111; and a surface film forming subroutine 112.

If the lamp structural member belongs to an outdoor lamp, only iron and stainless steel structural members can be derusted.

The surface film forming subroutine 112 includes:

a first surface film forming step 1121, for forming a film on the surface of the lamp structural member made of the first type metal material by using an acidic passivation solution, and performing acidic cleaning on the surface of the lamp structural member made of the second type metal material;

the second surface film forming step 1122 is selectively performed for the lamp structure made of the second type metal, and is used to form a film on the surface of the lamp structure made of the second type metal by using the silane solution.

In an alternative example, the first type of metal material includes: aluminum-based and zinc-based materials; the second type metal material comprises: iron and stainless steel materials. Optionally, before the surface treatment process 11, the preparation work may be performed in advance for the lamp structural member made of an iron-based or stainless steel-based material: and grinding and polishing the surface of the lamp structural member. In a specific example, if the lamp structural part belongs to an indoor lamp, surface inspection can be carried out, and the lamp structural part is qualified without rusting and corrosion and obvious scratches; if rust and corrosion or obvious scratch occur, grinding and polishing repair are needed, and the surface of the structural part after plastic spraying operation can be more uniform and beautiful by grinding and polishing.

In an alternative example, the first surface film forming process may be performed by spraying a passivation solution on the lamp structure. Optionally, the passivating solution is prepared by mixing the following components in percentage by weight 3: mixing a solution of a passivating agent and water at a ratio of 100; the components of the passivator are 10% of phytic acid, 15% of silica sol, 70% of water and 5% of chromium nitrate.

In an alternative example, the second surface film forming process is performed by immersing the lamp structure into a silane solution. Optionally, the silane solution is prepared by mixing 3: mixing a solution of a silane agent and water in a ratio of 100; the components of the silane agent are as follows: 40% of silane, 15% of graphene, 20% of complexing agent and 5% of water.

In an alternative example, as shown in fig. 2, between the first surface film formation process 1121 and the second surface film formation process 1122, the surface treatment process may further include: the neutralization treatment process 113 includes: the surface of the lamp structure is treated by an alkaline neutralizing solution. The neutralization aims to neutralize the acidity in the lamp post surface partial passivation residual liquid, and is beneficial to the surface treatment of the subsequent silane solution.

In an alternative example, the lamp structure may also be sprayed with the neutralizing solution. Optionally, the neutralizing solution is poured in a proportion of 0.1% into a neutralizing agent, such as soda ash, i.e. sodium carbonate (Na)₂CO₃) And water to form a neutralized solution.

In an alternative example, as shown in fig. 3, the degreasing sub-process 111 may include at least one degreasing process, and preferably includes a plurality of degreasing sub-processes.

A pre-degreasing step 1111 including; and (4) degreasing the surface of the lamp structural member by spraying a pre-degreasing solution. The pre-degreasing purpose is to remove slight protective vegetable oil and mineral oil such as rubbish, floating oil and the like on the surface of the lamp structural member.

A main degreasing step 1112 including; and degreasing the surface of the lamp structural member by immersing the lamp structural member in a main degreasing solution and ultrasonic waves. The main degreasing aims at removing oil stains on the surface of the lamp pole, substances which influence the adhesive force, such as silicone oil, wax, rust and the like in various fine positions (such as rolled workpieces, gaps and pinholes) in the lamp pole can be finely and effectively removed through the main degreasing solution and ultrasonic waves, the passivation and silane film forming effects in the subsequent surface film forming sub-process can be improved, the film is more tightly combined with the plastic spraying powder, and the adhesive force of the surface of a coating of the lamp pole is effectively improved.

Optionally, the pre-degreasing solution and the main degreasing solution contain a neutral degreasing agent, and the neutral degreasing agent comprises the following components: 10% of sodium dodecyl benzene sulfonate, 10% of polyoxyethylene octyl phenol ether, 5% of ethylene glycol monobutyl ether and 75% of water; the pre-degreasing solution can be a solution obtained by mixing the neutral degreasing agent and water according to the proportion of 3: 100; the main degreaser solution can be a solution prepared by mixing the neutral degreaser and water according to the proportion of 1: 100.

In an alternative example, the surface treatment process may further include: at least one washing step and a drying step after each washing step.

Optionally, the at least one washing process includes at least one of the following, and fig. 4 exemplarily shows three washing processes:

1) the first washing step 114 includes: between the degreasing sub-process 111 and the surface film forming sub-process 112, the lamp structure is subjected to immersion water washing. The first washing step 114 can wash the pre-degreased and main-degreased product and residual liquid on the lamp structure.

2) The second water washing step 115 includes: in the surface film forming sub-processes 112, the lamp structure is subjected to immersion water washing between adjacent surface film forming sub-processes (e.g., the first surface film forming process 1121 and the second surface film forming process 1122). The second water wash step 115 may be used to wash away the products and associated solutions of the previous surface film formation sub-process; when the neutralization treatment process 113 is present, the second water washing process 115 can wash off the products and residual chemicals generated after the neutralization solution on the lamp structure is reacted.

3) The third washing step 116 includes: after the surface film forming sub-process 112, the lamp structure is subjected to spray type water washing. The third washing step 116 may be used to wash away waste liquids such as silane solution remaining on the lamp structure.

As shown in fig. 5, the plastic injection process 12 may further include: a baking step 121, an electrostatic powder spraying step 122, a baking and solidifying step 123, and a cooling step 124.

The grilling process 121 can be used to burn off filiform dust on the surface of the lamp structure and reduce oil slick on the surface.

The electrostatic plastic powder spraying process 122 is used for performing electrostatic plastic powder spraying operation on the surface of the lamp structural member.

And the baking and curing process 123 is used for curing the molding powder sprayed on the surface of the lamp structural member by baking.

The cooling process can be used for cooling the baked lamp structural part by natural cooling, air cooling and the like.

Optionally, after the plastic spraying process, a checking procedure can be further set, and the adhesion quality of the plastic spraying coating of the lamp structural member after plastic spraying is checked. Specifically, whether the adhesion of the coating on the surface of the structural part of the lamp is qualified or not can be verified through an over-impact test, a Baige test and a neutral salt spray test.

Corresponding to the above-mentioned plastic spraying method, as shown in fig. 6, in the embodiment of the present application, a plastic spraying process system 3 for a lamp structural member 2 may also be provided.

In this embodiment, the plastic spraying process system 3 includes: a surface treatment conveying line 31 and a spraying conveying line 32 are arranged in sequence. Optionally, before the lamp structural member 2 is sent to the surface treatment conveying line 31, the surface of the lamp structural member 2 is ground and polished.

The surface treatment conveying line 31 includes: a first conveying mechanism 310 for conveying the lamp structure 2. In some alternative embodiments, the first conveying mechanism 310 may be implemented as a conveyor belt or a conveying track mounted in the air. When the first conveying mechanism 310 is a conveying track erected in the air, the lamp structure 2 can be suspended on the first conveying mechanism 310 by a hanger to move along with the first conveying mechanism.

The surface treatment conveying line 31 further includes: at least one degreasing tank, a first washing dipping tank 313, a first surface film forming spraying tank 314, a neutralizing solution dipping tank 315, a second washing dipping tank 316, a second surface film forming spraying tank 317, a third washing spraying tank 318 and a first drying channel 319 which are arranged along the first conveying mechanism in sequence; the first surface film-forming spraying groove 314 and the second surface film-forming spraying groove 317 are selectively activated corresponding to different metal materials of the lamp structure 2, respectively, so as to form a film on the surface of the lamp structure 2.

When the first conveying mechanism 310 is operated, the lamp structure 2 is conveyed by the first conveying mechanism to enter each groove respectively; when the lamp structure 2 needs to be processed in each slot, the first conveying mechanism 310 may pause to stop the lamp structure 2 in the slot, and resume the operation of the first conveying mechanism 310 after the processing is completed.

Optionally, the at least one degreasing tank may specifically include: the pre-degreasing spray tank 311 stores a pre-degreasing solution therein, and may have a spray head for performing the pre-degreasing process in the foregoing embodiment. In an alternative example, the showerhead may spray automatically. The automatic spraying may be implemented by, for example, sensing the entrance of the lamp structure 2 through a position sensor or the like disposed in the pre-degreasing spray tank 311, and generating a sensing signal to be transmitted to a controller of the spray header to control the operation of the spray header.

The at least one degreasing tank may further include: the primary degreasing bath 312 may be used for immersing the lamp structure 2 passing through the first conveying mechanism 310, so as to perform the primary degreasing process in the foregoing embodiment. The main degreasing bath 312 is pre-filled with a prepared main degreasing solution. For example, the main degreasing easy formulation process includes: adding the water level of the main degreasing dipping tank 312 to the liquid level of 2/3, pouring a neutral degreasing agent and water according to the proportion of 1% to mix into a main degreasing solution, and further opening a circulating pump of the main degreasing dipping tank 312 to heat the tank liquid to a certain temperature (for example, 45 +/-5 ℃) to complete the preparation of the main degreasing solution; and then, turning on the ultrasonic generator to keep the ultrasonic generator in the working state for several minutes (such as 3-5 minutes). In an alternative example, the control of the circulation pump and the ultrasonic generator of the main degreasing dipping tank 312 may be automatically performed, and the implementation manner may be that, for example, a position sensor or the like arranged in the main degreasing dipping tank 312 senses the entrance of the lamp structure 2 to generate a sensing signal, so as to transmit the sensing signal to the controller of the circulation pump and the ultrasonic generator, so as to control the operation of the circulation pump and the ultrasonic generator.

After the degreasing sub-process, the lamp structure 2 may be automatically immersed into the first washing dip tank 313 along with the first conveying mechanism 310 to perform the first washing process, and the first washing process may be performed for a certain time (e.g., about half a minute to 1 minute). Alternatively, tap water may be used as the water in the first washing soaking bath 313, and the water in the first washing soaking bath 313 may be in an overflow state.

After the first washing step, the lamp structural member 2 flows along with the first conveying mechanism 310 and enters the first surface film-forming spraying tank 314 to implement the first surface film-forming step, so that the surface of the lamp structural member 2 made of aluminum and galvanized materials can be subjected to film forming, the lamp structural member 2 made of iron and stainless steel materials can be subjected to acid cleaning, and the film forming of a silane solution in the second surface film-forming step can be facilitated. The first surface film-forming spray tank 314 is pre-stored with a prepared passivation solution. For example, the passivation solution may be formulated in a manner that includes: adding the water level of the passivation solution spraying tank to the liquid level of 2/3, and pouring the passivating agent and the water according to the proportion of 3% to mix into the passivation solution. In the first surface film forming step, the bath solution in the first surface film forming spray tank 314 is stirred and then sprayed, so that the sprayed passivation solution can be kept in an atomized state, and the spray pressure (e.g., 0.1-0.5 kgf/cm) is maintained for a certain time (e.g., about half a minute). In an alternative example, the control of the shower head of the first surface film forming shower trough 314 may be performed automatically, and may be implemented by sensing the entering of the lamp structure 2 through a position sensor or the like disposed in the first surface film forming shower trough 314, and generating a sensing signal to be transmitted to the controller of the shower head to control the operation of the shower head.

After the first surface film forming process, the lamp structure 2 is circulated by the first conveying mechanism 310 and dipped into the neutralizing solution dipping tank 315 to perform a neutralizing treatment process. The neutralizing solution leaching tank 315 stores a neutralizing solution. The preparation method of the neutralization solution comprises the following steps: the water level of the neutralizing solution dipping tank 315 is increased to 2/3, and a neutralizing agent (Na2CO3) and water are poured into the neutralizing solution according to the proportion of 0.1% to be mixed into a neutralizing solution. In the neutralization treatment process, the structure may be controlled to be immersed in the neutralizing solution free-immersion bath 315 for a period of time (e.g., about half a minute) to neutralize the acidity of the solution and the residual passivating solution.

After the neutralization treatment process, the lamp structure 2 is circulated and immersed into the second washing dip tank 316 along with the first conveying mechanism 310 to implement the second washing process, and the products and the residual liquid medicine after the neutralization reaction on the lamp structure 2 are rinsed clean; the water in the second water washing immersion tank 316 can be tap water, the water washing time can be controlled to be about half a minute, and the water in the second water washing immersion tank 316 can be in an overflow state.

After the second water washing step, the lamp structure 2 is circulated with the first conveying mechanism 310 and enters the second surface film-forming spraying tank 317.

The second surface film forming spray tank 317 may be selected to perform a second surface film forming process according to the metal material of the lamp structure 2.

If the lamp structure 2 is made of aluminum or zinc, the second surface film forming step is not performed in the second surface film forming spray tank 317.

If the structural member is made of an iron-based or stainless steel-based material, the spray head of the second surface film-forming spray tank 317 automatically sprays silane solution to the lamp structural member 2, and the spraying time of the iron-based or stainless steel lamp structural member 2 can be controlled to be about half a minute. The preparation method of the silane solution can be as follows: adding the water level of a silane solution dipping tank to the liquid level of 2/3, pouring a silane agent and water according to the proportion of 3% to mix into a silane solution, stirring the tank solution, then opening the spraying, keeping the sprayed solution in an atomized state, and keeping the spraying at a certain pressure (for example, 0.1-0.5 kgf/square centimeter) for about half a minute.

In some embodiments, there are various ways to determine the metal material of the lamp structure 2, for example, a label (for example, a sticker label, which may be a bar code, a two-dimensional code, an NFC, or an RFID label, etc.) is previously disposed on the lamp structure 2, and identification information related to the metal material of the lamp structure 2 is recorded in the label, for example, "0" represents an aluminum material or a zinc material, and "1" represents an iron material or a stainless steel material. In the area where the second surface film forming spray groove 317 is located, a reading device (such as a camera, an NFC or RFID reader, etc.) corresponding to the identification tag may be disposed to read the content therein, and the material of the lamp structure 2 is identified by an electronic device (such as a desktop, a laptop, a smart phone, a tablet computer, etc.) connected to the reading device (which may be in wired or wireless connection, or in near-end connection or far-end network connection), so as to control the spray head of the second surface film forming spray groove 317 to intelligently select the second surface film forming process.

After passing through the second surface film-forming spray tank 317, the lamp structure 2 flows along with the conveyor line and enters a third washing spray tank 318 to perform a third washing process. The spray head of the third washing spray groove 318 can automatically spray water to the structural part, and the spraying time of the lamp structural part 2 is about half a minute. The third washing spray can be pure water, and the spraying is maintained at a certain pressure (for example, 0.1-0.5 kgf/square centimeter) for about half a minute. The third washing procedure can wash out the residual silane solution and other waste liquid on the lamp structural member 2. Alternatively, if the lamp structure 2 is made of aluminum or zinc, the second surface film forming process is not performed, or the third water washing process may not be performed. However, if it is considered that some residual silane solution may be attached to the lamp structure 2 when passing through the second surface film-forming spray tank 317 even though the second surface film-forming process is not performed, and residual solution in the previous process may remain, the third washing may be performed, which is beneficial to improving the quality of the subsequent plastic spraying.

In an alternative example, the control of the shower head of the third water spray tank 318 may be performed automatically, and this may be achieved by sensing the entering of the lamp structure 2, for example, by a position sensor or the like provided in the third water spray tank 318, and generating a sensing signal to be transmitted to the controller of the shower head to control the operation of the shower head.

After passing through the third washing spray tank 318, the lamp structure 2 subjected to surface treatment enters a first drying tunnel 319, such as a tunnel-type automatic drying tunnel, through a conveyor line to dry the water in the lamp structure 2, and the first drying tunnel 319 sets a certain drying temperature (e.g., 180 ℃ to 200 ℃) and dries for a certain time (e.g., 15 to 18 minutes).

The spray delivery line 32 includes: a second conveying mechanism 320 for conveying the lamp structural members 2 transferred from the surface treatment conveying line 31; and a flame baking area 321, a spraying area 322, a second drying tunnel 323, and a circulating cooling area 324, which are sequentially disposed along the second conveying mechanism 320.

After the lamp structure 2 has been baked with a previous surface treatment, the lamp structure 2 can be fed to a paint line 32. The second conveying mechanism 320 may also be implemented as a conveyor belt or an erected conveying track, so that the lamp structure 2 can be suspended on the second conveying mechanism 320 by a suspension member to move along with the second conveying mechanism. Optionally, since the lamp structure 2 may have holes (such as screw holes), in order to prevent the plastic powder from falling into the holes during subsequent spraying, the holes on the lamp structure 2 may be blocked, for example, by plugging a silica gel protective sleeve.

Then, the lamp structure 2 enters the flame burning area 321 along with the second conveying mechanism 320, and the flame burner can be automatically opened in the flame burning area 321 to bake the lamp structure 2, so as to burn off filiform dust and little floating oil on the surface. In an alternative example, the automatic turning on of the flame burner may be realized by sensing the entering of the lamp structure 2, for example, by a position sensor or the like disposed in the flame grilling area 321, and generating a sensing signal to be transmitted to a controller of the flame burner so as to control the operation of the flame burner.

After passing through the flame baking area 321, the lamp structure 2 enters the spraying area 322 along with the second conveying mechanism 320, and the electrostatic plastic powder spraying operation on the lamp structure 2 is realized through an automatic spray gun. In an alternative example, the induction signal may be generated by sensing the entry of the lamp structure 2 by a position sensor or the like provided in the painting area 322 to be transmitted to a controller of the automatic spray gun to control the operation of the automatic spray gun.

In some examples, the electrostatic powder coating may be configured to ensure coating quality. For example, the operating condition of the automatic spray gun is checked, and the voltage and the pressure of compressed air are adjusted to be within the range of working indexes; for example, the lifting height is adjusted according to the height of the lamp structural part 2, the automatic spray gun is sprayed in a trial mode, and whether the powder is uniformly discharged is checked; for example, the powder output of the spray gun is adjusted according to the characteristics of the lamp structural part 2 so as to ensure the coating quality; the spraying condition can be checked in a way of matching with manual visual inspection in the first spraying, and the surface of the workpiece is determined to be completely covered by the powder without powder piling and bottom material falling; if the lamp structural member 2 with a complex structure is adopted, the gun can be manually repaired from front to back so as to ensure the appearance quality of the coating.

After passing through the painting zone 322, the light fixture structure 2 is transported by the second conveyor 320 into a drying tunnel, such as a tunnel-type automatic drying tunnel, for curing. Optionally, the second drying tunnel 323 is set to a certain temperature (e.g., 180 ℃ to 220 ℃) with an upper limit higher than that of the previous first drying tunnel 319), and is heated for a certain time period (e.g., 18 to 20min, which may be longer than that of the previous first drying tunnel 319).

After passing through the spraying area 322, the lamp structure 2 may circulate along with the second conveying mechanism 320, and a section of the second conveying mechanism 320 for naturally cooling the baked and solidified lamp structure 2 is left in the extending direction thereof as a circulation cooling area. The time for circulating the natural cooling may be, for example, around 15 minutes, depending on the lamp structure 2 temperature, the ambient temperature, etc.

Optionally, the cooled lamp structural member 2 may be taken down from the spraying conveyor line 32, after inspection, the qualified products are respectively packaged according to types, and the unqualified products are ground and polished and then placed back to the surface treatment conveyor line 31 and the spraying conveyor line 32 to perform the above processes again.

It should be noted that fig. 6 shows a preferred embodiment corresponding to the method of fig. 5, but the embodiment is not limited to the only system implementation, and the system may also include corresponding slots or regions corresponding to different processes in the previous embodiments of the method of fig. 1 and 4, and is not limited to the implementation of fig. 6. For example, the number of washing steps may be changed, and the corresponding washing tank may be changed accordingly.

The flow of the plastic spraying method is described below by taking lamp structural members made of different metal materials as examples.

Example 1:

in example 1, the lamp structure to be subjected to the plastic powder spraying operation is an indoor iron lamp post:

1. surface grinding and polishing:

the surface of the indoor iron lamp pole is inspected, and the lamp pole is qualified without rusting, corrosion and obvious scratch.

2. Hang surface treatment transfer chain on the lamp pole:

a hanger special for a lamp post is used. When hanging the operation, pay attention to the position that the lamp pole hung in the operation, consider that the lamp pole can not ponding, consider that can not bump between climbing process lamp pole and the lamp pole, need to keep enough sufficient interval (for example not less than 500mm) between two hoisting points of lamp pole.

3. Automatically spraying a pre-degreasing solution:

the lamp post enters the pre-degreasing spray tank along with the circulation of the conveying line, the spray head automatically sprays pre-degreasing operation to the lamp post, and the spraying time of the lamp post is automatically controlled to be 0.5 minute.

4. Immersing in a main degreasing solution:

the lamp pole is automatically immersed into the main degreasing dipping tank along with the conveying line, and the time for immersing the lamp pole into the main degreasing dipping tank is automatically controlled to be 3 minutes.

5. First water wash (immersion):

the lamp pole is automatically immersed into the first washing dipping tank along with the conveying line, and the time for immersing the lamp pole into the first washing dipping tank is automatically controlled to be 0.5 minute. The water in the first washing dipping tank is tap water, the washing time is 0.5 min, and the water in the first washing dipping tank is in an overflow state.

6. Spraying a passivation solution:

the lamp post enters the first surface film-forming spraying groove along with the circulation of the conveying line, the spraying head automatically sprays the passivation solution to the lamp post, and the spraying time of the lamp post is automatically controlled to be 0.5 minute.

The passivation can carry out the acid cleaning effect once to the lamp pole surface, does benefit to the film forming of follow-up silane solution.

7. Immersion in neutralizing solution:

the lamp pole is automatically immersed into the neutralizing solution immersion tank along with the conveying line, and the time for immersing the lamp pole into the neutralizing solution immersion tank is automatically controlled to be 0.5 minute.

8. Second water wash (immersion):

the lamp pole is automatically immersed into the second washing dipping tank along with the conveying line, and the time for immersing the lamp pole into the second washing dipping tank is automatically controlled to be 0.5 minute. The water in the second washing dipping tank is tap water, the washing time is 0.5 min, and the water in the second washing dipping tank is in an overflow state.

9. Spraying a silane solution:

the lamp post is transferred into the second surface film-forming spraying groove along with the flow of the conveying line, the spraying head automatically sprays silane solution to the lamp post, and the spraying time of the lamp post is automatically controlled to be 0.5 minute.

10. Third washing (spray type):

the lamp post enters a third washing spraying groove along with the circulation of the conveying line, the spraying head automatically sprays pure water to the lamp post, and the spraying time of the lamp post is automatically controlled to be 0.5 minute. Pure water is sprayed in the third water washing, and the spraying pressure is as follows: 0.4kgf/cm²The time period was 0.5 minutes.

11. Drying with water:

and (3) enabling the lamp post subjected to surface treatment to enter a tunnel type automatic drying tunnel through a conveying line, wherein the temperature of the drying tunnel is set to be 195 ℃ for example, and the drying time is 17min for example.

12. Hanging a spraying line:

and transferring the dried lamp post to a spraying conveying line through a worker or a robot, and plugging a silica gel protective sleeve at the position with a screw hole on the lamp post.

13. And (3) roasting with flame:

the lamp post enters a flame baking area along with the conveying line, the flame burner is automatically opened to be aligned with the lamp post for baking, and filiform dust and little floating oil on the surface of the lamp post are burned off after the lamp post passes through the flame area.

14. Electrostatic plastic powder spraying:

the lamp pole enters a spraying area along with the conveying line, and electrostatic plastic powder spraying operation on the lamp pole is achieved through the automatic spray gun.

Attention points before electrostatic plastic powder spraying: checking the running condition of an automatic spray gun of the equipment, adjusting the voltage and the pressure of compressed air to be within a working index range, adjusting the lifting height according to the height of a workpiece, trying to spray the automatic spray gun, and checking whether the powder is uniform or not; adjusting the powder output of the spray gun according to the characteristics of the workpiece to ensure the coating quality; the spraying condition is manually and visually checked for the first spraying, the surface of a workpiece is determined to be completely covered by powder, powder stacking and bottom material falling phenomena do not exist, and if the workpiece is complex in structure, a gun can be manually repaired from front to back to ensure the appearance quality of a coating.

15. Baking and curing:

the lamp post sprayed with the plastic powder automatically enters a tunnel type automatic drying tunnel through a conveying line, the temperature of the drying tunnel is set to be 210 ℃, and the heating time is 20 min.

16. Circulating and cooling:

and after the heated lamp post leaves the tunnel type automatic drying tunnel, the lamp post flows along with the conveying line and is naturally cooled for about 15 minutes.

17. Blanking and checking:

the hanging tool and the lamp post are manually taken down from the automatic spraying conveying line, after inspection, qualified products are respectively placed according to types, and unqualified products are sprayed again after being polished.

Further explanation is as follows:

in the working procedures, the surface adhesive force of the lamp pole coating can be effectively increased through the treatment of the 4 th step, the 6 th step and the 9 th step. After blanking, whether the surface adhesive force of the coating of the lamp post of the lamp is qualified or not can be verified through an impact test, a Baige test and a neutral salt spray test.

Example 2

In example 2, the lamp structural member to be subjected to the plastic powder spraying operation is an outdoor aluminum lamp housing:

1.skip surface grinding and polishing：

The lamp structural member made of aluminum does not need to be polished.

2. Hanging a surface treatment conveying line on the lamp shell:

a hanger dedicated to the lamp housing is used. When hanging the operation, notice the position that the lamp body hung in the operation, consider that the lamp body can not ponding, consider that can not bump between lamp body and the lamp body among the climbing process, need to leave enough interval (for example be not less than 500mm) between two hoisting points of lamp body.

3. Automatically spraying a pre-degreasing solution:

the lamp housing enters the pre-degreasing spray tank along with the circulation of the conveying line, the spray head automatically sprays pre-degreasing operation to the lamp housing, and the spraying time of the lamp housing is automatically controlled to be 0.5 minute.

4. Immersing in a main degreasing solution:

the lamp housing is automatically immersed into the main degreasing dipping tank along with the conveying line, and the time for immersing the lamp housing into the main degreasing dipping tank is automatically controlled to be 3 minutes.

5. First water wash (immersion):

the lamp housing is automatically immersed into the first washing dipping tank along with the conveying line, and the time for immersing the lamp housing into the first washing dipping tank is automatically controlled to be 0.5 minute. The water in the first washing dipping tank is tap water, the washing time is 0.5 min, and the water in the first washing dipping tank is in an overflow state.

6. Spraying a passivation solution:

the lamp shell enters the first surface film-forming spraying groove along with the circulation of the conveying line, the spraying head automatically sprays the passivation solution to the lamp shell, and the spraying time of the lamp shell is automatically controlled to be 0.5 minute.

The passivation aims at forming a film on the surface of the outdoor aluminum lamp shell, prevents a structural part from being corroded to a certain extent, can improve the adhesive force and the corrosion resistance of the coating, and is one of key processes for improving the adhesive force of the surface of the coating of the outdoor aluminum lamp shell.

7. Immersion in neutralizing solution:

the lamp shell is automatically immersed into the neutralization solution immersion tank along with the conveying line, and the time for immersing the lamp shell into the neutralization solution immersion tank is automatically controlled to be 0.5 minute.

8. Second water wash (immersion):

the lamp shell is automatically immersed into the second washing dipping tank along with the conveying line, and the time for immersing the lamp shell into the second washing dipping tank is automatically controlled to be 0.5 minute. The water in the second washing dipping tank is tap water, the washing time is 0.5 min, and the water in the second washing dipping tank is in an overflow state.

9.No silane solution was sprayed:

the lamp housing flows along with the conveying line and enters the second surface film-forming spraying groove, the silane solution is not sprayed, and the second surface film-forming spraying groove is emptied away.

10. Third washing (spray type):

the lamp shell enters a third washing spray tank along with the circulation of the conveying line, the spray head automatically sprays pure water to the lamp shell, and the spraying time of the lamp shell is automatically controlled to be 0.5 minute. Pure water is sprayed in the third water washing, and the spraying pressure is as follows: 0.4kgf/cm²The time period was 0.5 minutes.

11. Drying with water:

the surface-treated lamp envelopes are passed through a conveyor line into a tunnel-type automatic drying tunnel, the temperature of which is set, for example, at 185 ℃, for a drying time of, for example, 16 min.

12. Hanging a spraying line:

and transferring the dried lamp housing to a spraying conveying line manually or by a robot, and plugging a silica gel protective sleeve at the position with a screw hole on the lamp housing.

13. And (3) roasting with flame:

the lamp housing enters a flame baking area along with the conveying line, the flame burner is automatically opened to be aligned with the lamp housing for baking, and filiform dust and little floating oil on the surface of the lamp housing are burned off after the lamp housing passes through the flame area.

14. Electrostatic plastic powder spraying:

the lamp shell enters a spraying area along with the conveying line, and electrostatic plastic powder spraying operation on the lamp shell is realized through an automatic spray gun.

15. Baking and curing:

the lamp housing sprayed with the plastic powder automatically enters a tunnel type automatic drying tunnel through a conveying line, the temperature of the drying tunnel is set to be 190 ℃, and the heating time is 18 min.

16. Circulating and cooling:

and after the heated lamp shell leaves the tunnel type automatic drying tunnel, the lamp shell flows along with the conveying line and is naturally cooled for about 15 minutes.

17. Blanking and checking:

and manually taking down the hanging tool and the lamp housing of the lamp from the automatic spraying conveying line, respectively placing qualified products according to types after inspection, and re-spraying unqualified products after polishing.

Further explanation is as follows:

in the above procedures, the treatments in the steps 4, 6 and 9 can effectively increase the surface adhesion of the lamp shell coating. After blanking, whether the surface adhesive force of the coating of the lamp shell of the lamp is qualified or not can be verified through an impact test, a Baige test and a neutral salt spray test.

The embodiment of the application provides a plastic spraying method and a system for a lamp structural part, which have the following beneficial effects:

1. stripping oil stains on the surface of the lamp structural member by using a main degreasing solution and ultrasonic waves:

in the embodiment of the application, the ultrasonic device is innovatively added in the main degreasing process, substances which influence the adhesive force, such as silicone oil, wax, rust and the like in a calendaring workpiece, a gap and a pinhole in a lamp structural member can be removed through the main degreasing solution and the ultrasonic wave, the passivation and silane film forming effects of the subsequent process can be improved, and the film and the powder are combined more tightly.

2. The coating adhesion of the aluminum and galvanized plate lamp structural parts can be improved by adding the passivation of the first surface film forming procedure:

in the embodiment of the application, a passivation process is innovatively adopted, so that a film can be formed on the surfaces of aluminum and galvanized plate structural members, the adhesive force and the corrosion resistance of a coating are improved, and meanwhile, the surface of iron and stainless steel structural members can be subjected to one-time acid cleaning effect, so that the subsequent silane formation is facilitated.

3. The silane solution treatment added with the second surface film forming procedure can improve the coating adhesive force of iron and stainless steel lamp structural parts:

according to the embodiment of the application, a silane process is innovatively adopted, so that a film can be formed on the surfaces of iron and stainless steel structural members, and the adhesive force and the corrosion resistance of a coating are improved.

4. The scheme in the embodiment of the application can satisfy all lamps and lanterns structure spary spraying plastics operation: the spraying process can be universally realized for indoor and outdoor purposes, the spraying process for four lamp structural members of a lamp post, an end cover, a lamp shell and a bracket can be universally realized, and the spraying process for four materials of iron, aluminum, stainless steel and galvanized parts can be realized at the same time.

The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.

Claims

1. A plastic spraying method for a lamp structural member is characterized by comprising the following steps: a surface treatment process and a subsequent plastic spraying process;

the surface treatment process comprises the following steps:

a degreasing sub-process; and

a surface film forming sub-process comprising: a first surface film forming procedure for forming a film on the surface of the lamp structural part made of the first type of metal material through an acidic passivation solution and performing acidic cleaning on the surface of the lamp structural part made of the second type of metal material; and a second surface film forming step of selectively applying the second surface film forming step to a lamp structural member made of a second type metal and forming a film on the surface of the lamp structural member made of the second type metal by using a silane solution.

2. The method of claim 1, wherein the first type of metal material comprises: aluminum-based and zinc-based materials; the second type metal material comprises: iron and stainless steel materials.

3. The method of claim 2, comprising at least one of:

1) the first surface film forming procedure adopts a mode of spraying a passivation solution on a lamp structural part;

2) the passivation solution is prepared by the following steps of: mixing a solution of a passivating agent and water at a ratio of 100; the components of the passivator are 10% of phytic acid, 15% of silica sol, 70% of water and 5% of chromium nitrate;

3) the second surface film forming procedure adopts a mode of immersing the lamp structural part into silane solution;

4) the silane solution is prepared by mixing the following components in percentage by weight 3: mixing a solution of a silane agent and water in a ratio of 100; the components of the silane agent are as follows: 40% of silane, 15% of graphene, 20% of complexing agent and 5% of water.

4. The plastic injection molding method according to claim 1, wherein the surface treatment process further comprises, between the first surface film forming process and the second surface film forming process:

a neutralization treatment process comprising: the surface of the lamp structure is treated by an alkaline neutralizing solution.

5. The plastic injection molding method according to claim 1, wherein the degreasing sub-process comprises at least one degreasing step selected from the group consisting of:

a pre-degreasing process comprising; degreasing the surface of the lamp structural member by spraying a pre-degreasing solution;

a main degreasing step including; and degreasing the surface of the lamp structural member by immersing the lamp structural member in a main degreasing solution and ultrasonic waves.

6. The plastic injection method according to claim 5, wherein the pre-degreasing solution and the main degreasing solution contain a neutral degreasing agent, and the neutral degreasing agent comprises the following components: 10% of sodium dodecyl benzene sulfonate, 10% of polyoxyethylene octyl phenol ether, 5% of ethylene glycol monobutyl ether and 75% of water; the pre-degreasing solution is a solution obtained by mixing the neutral degreasing agent and water according to the proportion of 3: 100; the main degreasing agent solution is a solution obtained by mixing the neutral degreasing agent and water according to the proportion of 1: 100.

7. The plastic injection molding method according to claim 1, wherein the surface treatment process further comprises: at least one washing step and a drying step after each washing step; the at least one washing process comprises at least one of the following:

1) the first washing process comprises the following steps: performing immersion water washing on the lamp structural part between the degreasing sub-process and the surface film forming sub-process;

2) and a second water washing process, which comprises the following steps: performing immersion water washing on the lamp structural part between adjacent surface film forming sub-processes in the surface film forming sub-processes;

3) the third washing process comprises the following steps: and after the surface film forming sub-process, carrying out spray type water washing on the lamp structural part.

8. The plastic injection method of claim 1, wherein the plastic injection process comprises: the method comprises a roasting process, an electrostatic plastic powder spraying process, a baking and solidifying process and a cooling process.

9. A spraying plastics process systems for lamps and lanterns structure spare, its characterized in that includes: a surface treatment conveying line and a spraying conveying line are arranged in sequence;

the surface treatment transfer chain includes: the first conveying mechanism is used for conveying the lamp structural part; the first conveying mechanism is provided with at least one degreasing tank, a first washing dipping tank, a first surface film forming spraying tank, a neutralizing solution dipping tank, a second washing dipping tank, a second surface film forming spraying tank, a third washing spraying tank and a first drying channel;

the first surface film-forming spraying groove is used for forming a film on the surface of a lamp structural part made of a first type of metal material through an acidic passivation solution and performing acidic cleaning on the surface of a lamp structural part made of a second type of metal material; the second surface film-forming spraying groove is selectively started for the lamp structural part made of the second type of metal material, and is used for forming a film on the surface of the lamp structural part made of the second type of metal material through silane solution.

10. The plastic injection molding process system of claim 9, wherein the first type of metal material comprises: aluminum-based and zinc-based materials; the second type metal material comprises: iron and stainless steel materials.

11. The plastic injection molding process system of claim 9, wherein the spray conveyor line comprises: the second conveying mechanism is used for conveying the lamp structural parts transferred from the surface treatment conveying line; and a flame roasting area, a spraying area, a second drying channel and a circulating cooling area which are sequentially arranged along the second conveying mechanism.