阅读说明：本技术 定点粉末静电喷涂及固化方法及喷涂固化系统 (Fixed-point powder electrostatic spraying and curing method and spraying and curing system ) 是由 陈家文 陈海山 谷海军 陈武辉 黄日平 梁炳华 张家权 麦家威 于 2021-09-15 设计创作，主要内容包括：本发明公开一种定点粉末静电喷涂及固化方法及喷涂固化系统,该定点粉末静电喷涂及固化方法及喷涂固化系统在使用时,可以提升在金属容器粉末涂料的厚度,以提升对金属容器的待喷涂部位处保护的可靠性。该定点粉末喷涂及固化方法,包括：把金属容器需要定点喷涂的待喷涂部位调整到相应位置；对金属容器的待喷涂部位进行预热；对预热完毕后的金属容器的待实施定点静电粉末喷涂；喷涂完毕后,对位于所述金属容器的待喷涂部位处的粉末涂料进行加热到预设温度并保温预设时长。(The invention discloses a fixed-point powder electrostatic spraying and curing method and a spraying and curing system. The fixed-point powder spraying and curing method comprises the following steps: adjusting the part to be sprayed of the metal container, which needs to be sprayed at fixed points, to a corresponding position; preheating a part to be sprayed of the metal container; electrostatic powder spraying is carried out on the metal container to be subjected to fixed point after preheating is finished; and after the spraying is finished, heating the powder coating at the part to be sprayed of the metal container to a preset temperature and preserving heat for a preset time.)

1. A fixed-point powder spraying and curing method is characterized by comprising the following steps:

adjusting the part to be sprayed of the metal container, which needs to be sprayed at fixed points, to a corresponding position;

preheating a part to be sprayed of the metal container;

carrying out fixed-point electrostatic powder spraying on the part to be sprayed of the preheated metal container;

and after the spraying is finished, heating the powder coating at the part to be sprayed of the metal container to a preset temperature and preserving heat for a preset time.

2. The spot powder spraying and curing method according to claim 1, wherein the preheating temperature in the step of preheating the portion of the metal container to be sprayed is T1, wherein T1 is 130 ℃ to 160 ℃.

3. The spot powder spray and cure method according to claim 1, wherein the spot electrostatic powder spray is performed on the part to be sprayed of the preheated metal container, and after the spray is completed, the powder coating is heated to a predetermined temperature and kept at the predetermined temperature for a predetermined period of time, wherein the temperature for heating the powder coating is T2, wherein T1 is 200 ℃ to 260 ℃.

4. The spot powder coating and curing method according to any one of claims 1 to 3, wherein in the step of performing electrostatic spot powder coating on the preheated metal container, heating the powder coating to a predetermined temperature and keeping the temperature for a predetermined time after the electrostatic spot powder coating is completed, the predetermined time is T, wherein T is 15s-25 s.

5. A fixed point powder electrostatic spraying and curing system, comprising:

the positioning device adjusts the part to be sprayed of the metal container to a corresponding position;

the first heating device is used for preheating a part to be sprayed of the metal container;

the fixed-point powder spraying structure is used for carrying out fixed-point electrostatic powder spraying on the part to be sprayed of the metal container; and

and the second heating device is used for heating the powder coating sprayed to the part to be sprayed of the metal container to a preset temperature and preserving heat for a preset time.

6. The electrostatic powder spot coating and curing system of claim 5, wherein the first heating device and/or the second heating device are electromagnetic heating elements.

7. The fixed-point powder electrostatic spraying and curing system of claim 5, wherein the fixed-point powder spray structure comprises:

the spray head device comprises a spray head and a connecting arm connected with the spray head, and the spray head is used for spraying powder coating and leading the powder coating to be charged with high-voltage static electricity;

the first driving mechanism is connected with the connecting arm in a sliding manner and is used for driving the connecting arm to drive the spray head to move along a direction close to or far away from the inner wall of the metal container; and

and the second driving mechanism is connected with the connecting arm and is used for driving the connecting arm to drive the spray head to stretch into or stretch out of the metal container.

8. The electrostatic spot powder coating and curing system according to any one of claims 5 to 7, further comprising a transport structure for transporting the metal container to a site to be processed.

9. The spot powder electrostatic spraying and curing system of claim 8, wherein the transport structure comprises:

the clamping piece comprises a first clamping arm and a second clamping arm, and the first clamping arm and the second clamping arm form a clamping opening for clamping the metal container;

a third driving mechanism having a first state in which the first and second gripping arms are driven to move in a first direction and a second state in which the first and second gripping arms are driven to move in a second direction opposite to the first direction; and

a fourth driving mechanism having a third state in which the first and second gripping arms are driven to grip the metal container and a fourth state in which the first and second gripping arms are driven to release the metal container;

wherein the fourth drive mechanism is in the third state when the third drive mechanism is in the first state; when the third drive mechanism is in the second state, the fourth drive mechanism is in the fourth state.

10. The electrostatic spot powder coating and curing system of claim 5, further comprising a transport structure for transporting the metal container to a site to be processed.

Technical Field

The invention relates to the technical field of metal packaging powder spraying equipment, in particular to a fixed-point powder electrostatic spraying and curing method and a spraying and curing system.

Background

In the metal packaging manufacturing industry, it is often necessary to use metal containers to hold water-based chemical coatings or food. Some containers are provided with corresponding metal attachments which are welded either to the body wall of the container or to the lid, and which during the welding process damage the coating or film layer on the inner surface of the container. Therefore, it is necessary to perform a coating repair at the weld site with a paint to protect the surface of the coating damaged by the weld.

The traditional spraying adopts liquid coating, the solvent of the liquid coating pollutes the environment, the liquid coating is sticky, the machine equipment is difficult to clean, and the spraying station is dirty and messy; moreover, liquid coatings are difficult to spray thick, and too thick can cause dripping. Generally, the liquid spray can only reach more than ten microns after being solidified. In order to cure the dripping liquid coating, the whole container is heated by a tunnel type oven, so that the power consumption is high. Therefore, it is desirable to perform powder coating to repair the weld of the metal container.

However, in the conventional powder spraying process, the powder coating with high voltage static electricity is often scattered in the powder spraying process, so that the powder coating sprayed on the welding position of the metal container is thin, and the protection effect is affected.

Disclosure of Invention

Based on the above, the invention adopts powder electrostatic spraying to replace the traditional liquid complementary coating, and provides a fixed-point powder electrostatic spraying and curing method and a spraying and curing system aiming at the problem that powder scattering often occurs in the powder spraying process and the powder coating sprayed at the welding part of a metal container is thinner.

The specific technical scheme is as follows:

in one aspect, the present application relates to a fixed-point powder spray and cure method comprising:

adjusting the part to be sprayed of the metal container, which needs to be sprayed at fixed points, to a corresponding position;

preheating a part to be sprayed of the metal container;

carrying out fixed-point electrostatic powder spraying on the part to be sprayed of the preheated metal container;

and after the spraying is finished, heating the powder coating at the part to be sprayed of the metal container to a preset temperature and preserving heat for a preset time.

When the fixed-point powder spraying and curing method is used, the part to be sprayed of the metal container, which needs to be sprayed at a fixed point, is adjusted to a corresponding position; preheating a part to be sprayed of the metal container, wherein when powder coating is sprayed on the part to be sprayed, the bottom layer powder coating which is firstly contacted with the part to be sprayed is fused and adhered on the inner wall of the inner wall metal container of the metal container, because the metal container is generally grounded, the bottom layer semi-molten coating particles can release static electricity, and the powder coating with high-voltage static electricity which is subsequently sprayed can be more easily combined on the bottom layer powder coating without the condition of powder scattering due to mutual repulsion of charges with the same kind, so that the thickness of the powder coating at the part to be sprayed of the metal container can be increased; after the spraying is finished, the powder coating at the position to be sprayed of the metal container is heated and insulated to be solidified, so that the bonding stability of the powder coating is improved.

The technical solution is further explained below:

in one embodiment, in the preheating step of the part to be sprayed of the metal container, the preheating temperature is T1, wherein the temperature is more than or equal to 130 ℃ and less than or equal to T1 and less than or equal to 160 ℃.

In one embodiment, after the preheating is finished, the fixed-point electrostatic powder spraying is carried out on the part to be sprayed of the metal container, and after the spraying is finished, the powder coating is heated to a preset temperature and is kept for a preset time, wherein the temperature for heating the powder coating is T2, and is more than or equal to 200 ℃ and less than or equal to T1 and less than or equal to 260 ℃.

In one embodiment, after the pre-heated metal container is subjected to fixed-point electrostatic powder spraying, the powder coating is heated to a preset temperature and is kept warm for a preset time period, wherein the preset time period is T, and T is 15s-25 s.

In another aspect, the present application is directed to a fixed-point electrostatic powder coating and curing system comprising:

the positioning device adjusts the part to be sprayed of the metal container to a corresponding position;

the first heating device is used for preheating a part to be sprayed of the metal container;

the fixed-point powder spraying structure is used for carrying out fixed-point electrostatic powder spraying on the part to be sprayed of the metal container; and

and the second heating device is used for heating the powder coating sprayed to the part to be sprayed of the metal container to a preset temperature and preserving heat for a preset time.

The technical solution is further explained below:

in one embodiment, the first heating device and/or the second heating device are electromagnetic heating elements.

In one embodiment, the spot powder spray structure comprises:

the spray head device comprises a spray head and a connecting arm connected with the spray head, and the spray head is used for spraying powder coating and leading the powder coating to be charged with high-voltage static electricity;

the first driving mechanism is connected with the connecting arm in a sliding manner and is used for driving the connecting arm to drive the spray head to move along the direction close to or far away from the inner wall of the metal container; and

and the second driving mechanism is connected with the connecting arm and is used for driving the connecting arm to drive the spray head to stretch into or stretch out of the metal container.

In one embodiment, the metal container processing device further comprises a conveying structure, wherein the conveying structure is used for conveying the metal container to a position to be processed.

In one embodiment, the conveying structure comprises:

the clamping piece comprises a first clamping arm and a second clamping arm, and the first clamping arm and the second clamping arm form a clamping opening for clamping the metal container;

a third driving mechanism having a first state in which the first and second gripping arms are driven to move in a first direction and a second state in which the first and second gripping arms are driven to move in a second direction opposite to the first direction; and

a fourth driving mechanism having a third state in which the first and second gripping arms are driven to grip the metal container and a fourth state in which the first and second gripping arms are driven to release the metal container;

wherein the fourth drive mechanism is in the third state when the third drive mechanism is in the first state; when the third drive mechanism is in the second state, the fourth drive mechanism is in the fourth state.

In one embodiment, the metal container processing device further comprises a conveying structure, wherein the conveying structure is used for conveying the metal container to a position to be processed.

When the fixed-point electrostatic powder spraying and curing system is used, the positioning device is used for adjusting the part to be sprayed of the metal container to the corresponding position; the part to be sprayed of the metal container is preheated through the first heating device, and after preheating is finished, fixed-point electrostatic powder spraying is carried out on the part to be sprayed of the metal container through the fixed-point powder spraying structure. When the powder coating is sprayed on the part to be sprayed, the bottom layer powder coating which is firstly contacted with the part to be sprayed is fused and adhered on the inner wall of the metal container, and the metal container is grounded, so that the semi-molten coating particles at the bottom layer can release static electricity, and the powder coating with high-voltage static electricity which is sprayed subsequently can be more easily combined on the bottom layer powder coating without the condition of powder scattering caused by mutual repulsion of charges with the same kind, so that the thickness of the powder coating at the part to be sprayed of the metal container can be increased; after the spraying is finished, the powder coating at the position to be sprayed of the metal container is heated and insulated through the second heating device, so that the powder coating is solidified, and the stability of the combination of the powder coating is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.

Furthermore, the drawings are not to scale of 1:1, and the relative dimensions of the various elements in the drawings are drawn only by way of example and not necessarily to true scale.

FIG. 1 is a schematic diagram of a fixed-point electrostatic powder spraying and curing system according to an embodiment;

FIG. 2 is a schematic diagram of a spot powder spray configuration in one embodiment;

FIG. 3 is a schematic view illustrating an assembly of the first driving mechanism and the head unit according to an embodiment;

FIG. 4 is a schematic view of an embodiment of the second driving mechanism and the transmission assembly assembled together;

FIG. 5 is a schematic diagram of a transport structure in one embodiment;

FIG. 6 is a schematic view of a transport structure in another embodiment;

FIG. 7 is a schematic view of a transport structure in another embodiment;

FIG. 8 is a flow chart illustrating a method for spot powder spraying and curing in one embodiment.

Description of reference numerals:

10. a fixed-point powder spraying structure; 100. a nozzle device; 110. a connecting arm; 120. a spray head; 200. a first drive mechanism; 210. a first connecting member; 220. a first drive assembly; 222. a first slide rail; 224. a first driving member; 2242. a first cam; 2244. a first abutting member; 226. a first link; 228. a second link; 230. a slider; 300. a second drive mechanism; 310. a second connecting member; 320. a second drive assembly; 322. a second slide rail; 324. a second driving member; 3242. a second cam; 3244. a second abutting member; 400. a transmission assembly; 410. a first joint bearing; 420. a joint link; 430. a second joint bearing; 20. a conveying structure; 500. a clamping member; 510. a first clamp arm; 512. a first clamping portion; 520. a second clamp arm; 522. a second clamping portion; 530. a clamping port; 600. a third drive mechanism; 610. a crank; 620. a third link; 630. a third connecting member; 700. a fourth drive mechanism; 710. a fourth connecting member; 720. a fourth link; 730. a fifth link; 740. a fifth connecting member; 750. a transmission member; 760. a driving member; 810. a first guide rail; 820. a second guide rail; 910. a first mounting seat; 920. a first rotating shaft; 930. a second mounting seat; 940. a second rotation shaft; 1000. a drive motor; 30. a first heating device; 40. a metal container; 50. a second heating device.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the manufacturing industry, metal containers are often required to contain some chemical coatings or foods. These metal containers are generally provided with corresponding metal attachments which are generally fixed to the container body by resistance welding and which, during the welding process, damage the protective coating of the metal surface in the vicinity of the metal attachment of the metal container. Therefore, it is necessary to additionally coat the welded portion of the metal container with a paint to protect the portion damaged by welding. In the powder spraying process, powder particles of powder coating with high-voltage static electricity are charged with the same charge in the powder spraying process, so that the coating at a welding position can repel each other when reaching a certain thickness, the powder scattering phenomenon can occur, the coating sprayed at the welding position of a metal container is thinner, and the protection effect is influenced.

Based on this, the application provides a fixed point powder electrostatic spraying and curing method and a spraying and curing system, which can improve the thickness of the powder coating on the metal container 40 when in use, so as to improve the reliability of protection on the part to be sprayed of the metal container 40.

Referring to fig. 1, an electrostatic spot powder spraying and curing system (not shown) in an embodiment includes a first heating device 30, a spot powder spraying structure 10, and a second heating device 50, wherein the first heating device 30 is used for preheating a portion (not shown) to be sprayed of a metal container 40; the fixed-point powder spraying structure 10 is used for performing fixed-point electrostatic powder spraying on a part to be sprayed of the metal container 40; the second heating device 50 is used for heating the powder coating sprayed to the position to be sprayed of the metal container 40 to a preset temperature and keeping the temperature for a preset time.

When the fixed-point electrostatic powder spraying and curing system is used, firstly, the part to be sprayed of the metal container 40 is accurately positioned, then, the part to be sprayed of the metal container 40 is preheated through the first heating device 30, and after the preheating is finished, the fixed-point electrostatic powder spraying powder coating is carried out on the part to be sprayed of the metal container 40 through the fixed-point powder spraying structure 10. When the powder coating is sprayed on the part to be sprayed, the bottom layer powder coating which is firstly contacted with the part to be sprayed is melt-adhered on the side wall of the metal container 40, as the metal container 40 is generally grounded, the semi-molten coating particles at the bottom layer can release static electricity, the powder coating with high-voltage static electricity which is sprayed subsequently can be more easily combined on the bottom layer powder coating, the condition of powder scattering caused by mutual repulsion of charges with the same kind can not occur, and the thickness of the powder coating at the part to be sprayed of the metal container 40 can be further improved; after the spraying is finished, the powder coating at the position to be sprayed of the metal container 40 is heated and insulated by the second heating device 50, so that the powder coating is solidified, and the stability of the combination of the powder coating is improved.

In an embodiment, the fixed-point powder spraying structure 10 further includes a powder path reversing device, a powder supplying device, and a recovering device in publication No. CN110465419A, wherein the nozzle device 100 also adopts a nozzle device in publication No. CN110465419A, the nozzle device 100 is a powder nozzle device that can be used for local coating, the periphery of the nozzle device 100 is provided with an annular elastic body, and a high-pressure discharge needle, a powder spraying port, a recovering channel, and a needle blowing gas channel are arranged in the annular elastic body. The annular elastic lip ring tightly covers the local range needing to be coated, and prevents powder from leaking. The recovery device ensures that the redundant powder is completely recovered, and the inside of the sprayer device 100 is in a negative pressure state in the whole powder spraying process, so that the powder is further ensured not to fly upwards. It should be noted that the fixed-point powder spraying structure 10 further includes a powder reversing mechanism, when the nozzle device 100 is attached to the surface of the container, the powder reversing mechanism guides the powder flow to the nozzle device 100, and when the nozzle device 100 finishes spraying and leaves the surface of the container, the powder reversing mechanism guides the powder flow to the recycling bin. So as to ensure no powder flying in the operation process.

Specifically, in one embodiment, the first heating device 30 and/or the second heating device 50 are electromagnetic heating elements.

Referring to fig. 2 to 4, in one embodiment, the fixed-point powder spraying structure 10 includes a nozzle device 100, the nozzle device 100 includes a nozzle 120, a connecting arm 110 connected to the nozzle 120, a first driving mechanism 200 and a second driving mechanism 300, the first driving mechanism 200 is slidably connected to the connecting arm 110, and the first driving mechanism 200 is used for driving the connecting arm 110 to drive the nozzle 120 to move in a direction close to or away from an inner wall of the metal container 40; the second driving mechanism 300 is connected to the connecting arm 110, and the second driving mechanism 300 is used for driving the connecting arm 110 to drive the spray head 120 to move so as to extend into or extend out of the metal container 40. The spray head 120 is used to spray and apply high voltage static electricity to the powder coating.

Referring to fig. 2 to 4, when a part to be sprayed of the metal container 40 needs to be sprayed, the second driving mechanism 300 drives the connecting arm 110 to move, and then the connecting arm 110 drives the spray head 120 to extend into the metal container 40. The spray head 120 is driven to move in a direction close to the inner wall of the metal container 40 by the first driving mechanism 200; after the spraying is finished, the first driving mechanism 200 drives the spray head 120 to be away from the metal container 40, the second driving mechanism 300 drives the connecting arm 110 to drive the spray head 120 to move along the direction of moving out of the metal container 40, so that the connecting arm 110 drives the spray head 120 to move out of the metal container 40, the spraying is finished, and the efficiency is high in the whole spraying process.

In one embodiment, the first drive mechanism 200 and the second drive mechanism 300 may be operated independently. The sequence of operation of the first drive mechanism 200 and the second drive mechanism 300 is determined as desired.

Referring to fig. 2-3, in other embodiments, the first driving mechanism 200 may be further configured to operate synchronously with the second driving mechanism 300. At this time, the moving track of the nozzle 120 is a composite track of the moving track of the nozzle 120 (see the direction H1 in fig. 3) under the action of the first driving mechanism 200 and the moving track of the nozzle 120 (see the direction H2 in fig. 4) under the action of the second driving mechanism 300, see fig. 2, which shows the moving track H of the nozzle 120 under the synchronous action of the first driving mechanism 200 and the second driving mechanism 300.

Referring to fig. 2 to 4, the fixed point electrostatic powder spraying and curing system further includes a transmission assembly 400, and the second driving mechanism 300 can control the connecting arm 110 to move through the transmission assembly 400 during the movement process; specifically, the second driving mechanism 300 controls the connecting arm 110 to move through the transmission assembly 400, so as to drive the spray head 120 to extend into or move out of the metal container 40 through the connecting arm 110.

Referring to fig. 2 to 4, in order to realize the linkage between the first driving mechanism 200 and the second driving mechanism 300, one end of the transmission assembly 400 is rotatably connected to the connecting arm 110, the other end of the transmission assembly 400 is rotatably connected to the second driving mechanism 300, and the second driving mechanism 300 drives the connecting arm 110 to drive the spray head 120 to extend into or extend out of the metal container 40 by driving the transmission assembly 400.

Referring to fig. 2 to 4, the first driving mechanism 200 includes a first connecting member 210, and the first connecting member 210 is slidably connected to the connecting arm 110. The second driving mechanism 300 includes a second connecting member 310, one end of the transmission assembly 400 is rotatably connected to the connecting arm 110, and the other end of the transmission assembly 400 is rotatably connected to the second connecting member 310. The second driving mechanism 300 further includes a second driving assembly 320, and the second driving assembly 320 is used for driving the second connecting member 310 to move. The first driving mechanism 200 further includes a first driving assembly 220, and the first driving assembly 220 is used for driving the first connecting member 210 and the connecting arm 110 to drive the spray head 120 to move along a direction close to or far away from the inner wall of the metal container 40.

Referring to fig. 2 to 4, for example, in the spraying process, when the second driving assembly 320 drives the second connecting member 310 to move, the transmission assembly 400 drives the connecting arm 110 to move in the direction of entering the metal container 40 under the driving of the second connecting member 310, and at this time, the nozzle 120 also moves in the direction close to the inner wall of the metal container 40. The connecting arm 110, the transmission assembly 400 and the second connecting member 310 form a similar "linkage". When the first driving assembly 220 drives the connecting arm 110 to move in an opening manner, the transmission assembly 400 also rotates relative to the connecting arm 110 and the second connecting member 310 during the movement, so that the nozzle 120 moves in a direction of extending into the metal container 40 and in a direction of approaching the inner wall of the metal container 40, i.e., in a direction H in fig. 2, and further the nozzle 120 is conveyed to the part to be sprayed of the metal container 40 and pressed against the surface of the part to be sprayed.

Referring to fig. 2 and 4, in some embodiments, the transmission assembly 400 includes a first joint bearing 410, a joint link 420 and a second joint bearing 430, wherein one end of the joint link 420 is rotatably connected to the connecting arm 110 through the first joint bearing 410, and the other end of the joint link 420 is rotatably connected to the second connecting member 310 through the second joint bearing 430. Thus, when the second connecting member 310 moves, the joint link 420 is driven to move, and the connecting arm 110 is driven to move through the joint link 420; further, when the joint link 420 drives the connecting arm 110 to move, it also rotates relative to the connecting arm 110 and the second connecting member 310, so that the compound movement of the nozzle 120, that is, the movement in the direction H in the drawing, can be realized.

An alternative structure of the first driving assembly 220 will be specifically described below with reference to the embodiments.

Referring to fig. 2 and 3, the first driving assembly 220 includes a first slide rail 222, a first driving member 224, a first connecting rod 226, a second connecting rod 228 and a sliding member 230, the sliding member 230 is movably connected to the first slide rail 222, the first connecting member 210 is fixedly disposed on the sliding member 230, the first connecting rod 226 is rotatably connected to the sliding member 230, one end of the second connecting rod 228 is rotatably connected to the first connecting rod 226, the other end of the second connecting rod 228 is connected to the first driving member 224, the first driving member 224 is configured to drive the second connecting rod 228 to move so as to drive the first connecting rod 226 to rotate, and the first connecting rod 226 drives the sliding member 230 to drive the first connecting member 210 to move. Thus, the first connecting rod 226, the second connecting rod 228 and the sliding member 230 form a "connecting rod slider" mechanism, and when the first driving member 224 drives the second connecting rod 228 to move up and down, the second connecting rod 228 drives the first connecting rod 226 to drive the sliding member 230 to move left and right along the first sliding rail 222, so as to drive the connecting arm 110 to move left and right, that is, to drive the spray head 120 to move in a direction close to or away from the inner wall of the metal container 40.

It is to be noted that, in the present embodiment, both the upper and lower sides and the left and right sides are referred to the state in which the fixed point powder spray structure 10 in fig. 3 is currently located.

In some embodiments, the first driving member 224 may be a telescopic member or a pneumatic cylinder or the like.

Referring to fig. 3, in some embodiments, the first driving member 224 includes a first cam 2242 and a first abutting member 2244, one end of the first abutting member 2244 is connected to the second connecting rod 228, and the first cam 2242 abuts against the other end of the first abutting member 2244 to drive the second connecting rod 228 to move.

Alternative configurations of the second driving assembly 320 will be specifically described below with reference to the embodiments

Referring to fig. 4, the second driving assembly 320 includes a second sliding rail 322 and a second driving member 324, the second connecting member 310 is movably connected to the second sliding rail 322, and the second driving member 324 is used for driving the second connecting member 310 to move relative to the second sliding rail 322.

In some embodiments, the first driving member 224 may be a telescopic member or a pneumatic cylinder or the like.

Referring to fig. 4, in some embodiments, the second driving member 324 includes a second cam 3242 and a second abutting member 3244, one end of the second abutting member 3244 is connected to the second connecting member 310, and the second cam 3242 abuts against the other end of the second abutting member 3244 and drives the second abutting member 3244 to drive the second connecting member 310 to move. In order to automate the process of spraying the metal container 40 and improve the processing efficiency, the metal container 40 needs to be transported to the position to be processed by the corresponding transporting structure 20 before being sprayed. Referring to fig. 1 and 5, in some embodiments, the spot powder electrostatic spraying and curing system further includes a conveying structure 20, wherein the conveying structure 20 is used for conveying the metal container 40 to the position to be processed.

Referring to fig. 5, the conveying structure 20 includes a clamping member 500, a third driving mechanism 600 and a fourth driving mechanism 700. Wherein the clamping member 500 includes a first clamping arm 510 and a second clamping arm 520, the first clamping arm 510 and the second clamping arm 520 are formed with a clamping opening 530, and the metal container 40 is clamped through the clamping opening 530 during the transportation.

Specifically, referring to fig. 5, the first clamping arm 510 includes a first clamping portion 512, the second clamping arm 520 includes a second clamping portion 522, and the first clamping portion 512 and the second clamping portion 522 are disposed at intervals to form a clamping opening 530.

Referring to fig. 5, in one embodiment, the number of the first clamping portions 512 is at least two, and all the first clamping portions 512 are disposed at intervals along the length direction of the first clamping arm 510, wherein the length direction of the first clamping arm 510 is L1; the number of the second clamping portions 522 is at least two, and all the second clamping portions 522 are arranged at intervals along the length direction of the second clamping arm 520, wherein the length direction of the second clamping arm 520 is L2. One first clamping portion 512 corresponds to one second clamping portion 522. In this way, the at least two first clamping parts 512 and the at least two second clamping parts 522 can clamp the at least two metal containers 40 at the same time, and the conveying efficiency is improved.

Referring to fig. 5 to 7, the third driving mechanism 600 further includes a first state for driving the first and second clamp arms 510 and 520 to move along a first direction and a second state for driving the first and second clamp arms 510 and 520 to move along a second direction opposite to the first direction; the fourth driving mechanism 700 has a third state in which the first and second gripping arms 510 and 520 are driven to grip the metal container 40 and a fourth state in which the first and second gripping arms 510 and 520 are driven to release the metal container 40.

The third driving mechanism 600 drives the first and second clamp arms 510 and 520 to reciprocate, wherein the first and second directions are L3 and L4 directions in fig. 6, respectively. The fourth driving mechanism 700 functions to drive the first and second clamp arms 510 and 520 to clamp or unclamp the metal container 40. When the third driving mechanism 600 is in the first state, the third driving mechanism 600 drives the first and second gripping arms 510 and 520 to grip the metal container 40 and advance in the L3 direction, and when the third driving mechanism 600 is in the second state, the third driving mechanism 600 drives the first and second gripping arms 510 and 520 to return in the L4 direction, and the fourth driving mechanism 700 drives the first and second gripping arms 510 and 520 to release the metal container 40.

Specifically, when the third driving mechanism 600 is in the first state and the fourth driving mechanism 700 is in the third state, the first and second gripper arms 510 and 520 grip the metal container 40, and the third driving mechanism 600 drives the metal container 40 to advance to the next station in the direction L3.

Specifically, when the third driving mechanism 600 is in the second state, the fourth driving mechanism 700 is in the fourth state, and at this time, the fourth driving mechanism 700 drives the clamping opening 530 formed by the first clamping arm 510 and the second clamping arm 520 to become larger, the first clamping arm 510 and the second clamping arm 520 release the metal container 40, and the third driving mechanism 600 does not return together with the metal container 40 when driving the first clamping arm 510 and the second clamping arm 520 to return. By circulating the above steps, the metal container 40 can be continuously conveyed to the position to be processed.

In one embodiment, the conveying structure 20 further includes a guide rail, the first clamping arm 510 and the second clamping arm 520 are disposed at intervals on the guide rail, and both the first clamping arm 510 and the second clamping arm 520 can move relative to the guide rail. The third driving mechanism 600 is used for driving the first and second clamp arms 510 and 520 to move relative to the guide rail. The fourth driving mechanism 700 swings via the driving rail to move the first and second clamp arms 510 and 520 in directions toward and away from each other.

Specifically, referring to fig. 6 and 7, in some embodiments, the third driving mechanism 600 includes a crank 610, a third connecting rod 620 and a third connecting member 630, wherein one end of the third connecting rod 620 is rotatably connected to the crank 610, and the other end of the third connecting rod 620 is rotatably connected to the third connecting member 630. The first clamping arm 510 and the second clamping arm 520 are fixedly disposed on the third connecting member 630, the crank 610 rotates to drive the third connecting rod 620 to rotate, and the third connecting rod 620 drives the first clamping arm 510 and the second clamping arm 520 to move relative to the guide rail. In this manner, a "crank block" like structure is formed between the crank 610, the third link 620, the third link 630, and the first clamping arm 510 and the second clamping arm 520. The first and second gripper arms 510, 520 are driven to move relative to the rail by a "crank block" like principle.

Referring to fig. 5, in one embodiment, the guide rails include a first guide rail 810 and a second guide rail 820, the first clamping arm 510 is movably connected to the first guide rail 810, and the second clamping arm 520 is movably connected to the second guide rail 820.

Specifically, referring to fig. 5, the conveying structure 20 further includes a first mounting base 910 and a first rotating shaft 920, the first mounting base 910 is provided with a first mounting hole, the first rotating shaft 920 is rotatably inserted into the first mounting hole, and the first guide rail 810 is fixedly disposed on the first rotating shaft 920. The conveying structure 20 further includes a second mounting base 930 and a second rotating shaft 940, the second mounting base 930 is provided with a second mounting hole, the second rotating shaft 940 is rotatably inserted into the second mounting hole, and the second guide rail 820 is fixedly disposed on the second rotating shaft 940.

Referring to fig. 6 and 7, the fourth driving mechanism 700 drives the first rotating shaft 920 to rotate or drives the second rotating shaft 940 to rotate or simultaneously drives the first rotating shaft 920 and the second rotating shaft 940 to rotate, so that when the first rotating shaft 920 and/or the second rotating shaft 940 rotate, the first clamping arm 510 and the second clamping arm 520 move in a direction approaching to or moving away from each other, thereby enabling the clamping opening 530 to clamp or release the metal container 40.

Referring to fig. 5 and 7, in some embodiments, the fourth driving mechanism 700 includes a fourth connecting member 710 and a fourth connecting rod 720, one end of the fourth connecting member 710 is fixed to the first rotating shaft 920 and forms an included angle with the first rotating shaft 920, and specifically, the fourth connecting member 710 is perpendicular to the first rotating shaft 920. The other end of the fourth link 710 is rotatably connected to one end of the fourth link 720. The fourth link 720 and the fourth link 710 form a similar "link mechanism", when the fourth link 720 is driven to rotate, the fourth link 710 is pulled in the rotating process of the fourth link 720, the fourth link 710 drives the first rotating shaft 920 to rotate so as to drive the first guide rail 810 to swing, and at this time, the first guide rail 810 drives the first clamping arm 510 to swing.

Referring to fig. 5 and fig. 7, similarly, the fourth driving mechanism 700 further includes a fifth connecting member 740 and a fifth connecting rod 730, one end of the fifth connecting member 740 is fixedly disposed on the second rotating shaft 940 and forms an included angle with the second rotating shaft 940, and specifically, the fifth connecting member 740 is disposed perpendicular to the second rotating shaft 940. The other end of the fifth link 740 is rotatably connected to one end of the sixth link. The fifth link 730 and the fifth link 740 form a similar "link mechanism", when the fifth link 730 is driven to rotate, the fifth link 740 is pulled in the rotating process of the fifth link 730, the fifth link 740 drives the second rotating shaft 940 to rotate so as to drive the second guide rail 820 to swing, and at this time, the second guide rail 820 drives the second clamping arm 520 to swing.

The fourth link 720 and the fifth link 730 may be driven by two driving devices separately or simultaneously by one driving device.

Referring to fig. 6 and 7, in some embodiments, the fourth driving mechanism 700 further includes a transmission member 750, the fourth link 720 and the fifth link 730 are both rotatably connected to the transmission member 750, the transmission member 750 is configured to be moved by a force and simultaneously drive the fourth link 720 and the fifth link 730 to rotate, and the fourth link 720 pulls the fourth link 710 to drive the first rotating shaft 920 to rotate during the rotation process; the fifth link 730 pulls the fifth connecting member 740 to drive the second rotating shaft 940 to rotate during the rotation process.

Referring to fig. 6, in a further embodiment, the fourth driving mechanism 700 further includes an active member 760, and the active member 760 is used for driving the driving member 750 to move.

Alternatively, the driving member 760 is a third cam including a convex portion (not shown) and a round portion (not shown), and the transmission member 750 is provided with an abutting portion. When the third driving mechanism 600 is in the first state, the protruding portion abuts against the abutting portion and is in transmission fit with the abutting portion; when the third driving mechanism 600 is in the second state, the round portion abuts against the abutting portion and is in transmission engagement.

It should be noted that two motors may be provided to drive the crank 610 and the third cam to rotate separately, or a single motor may be provided to drive the crank 610 and the third cam to rotate.

Referring to fig. 5 and 6, in some embodiments, the conveying structure 20 further includes a driving motor 1000, and the driving motor 1000 drives the third cam and the crank 610 to rotate simultaneously.

The metal container 40 must be positioned accurately before it is fed into the dusting station in order to align the nozzle 120 with the welding spot area. In view of this, in one embodiment, the spot powder electrostatic spraying and solidifying system further comprises a positioning device for adjusting the position of the metal container 40 to be sprayed to a corresponding position to align with the spray head 120.

Alternatively, the positioning device may be a proximity switch or a photosensor.

In addition, referring to fig. 8, an embodiment of the invention further relates to a fixed-point powder spraying and curing method, including:

s100: the part to be sprayed of the metal container, which needs to be sprayed at fixed points, is adjusted to a corresponding position.

Specifically, the positioning device in the foregoing embodiment may be used to adjust the position of the metal container 40 to be sprayed to a corresponding position so as to align with the spray head 120.

S200: preheating a part to be sprayed of the metal container;

specifically, the first heating device 30 in any of the foregoing embodiments may be used to preheat the portion of the metal container to be sprayed.

In one embodiment, in step S100, the preheating temperature is T1, wherein 130 ℃. ltoreq.T 1. ltoreq.160 ℃. Because the powder is hot-melt polyester, the powder begins to soften and melt at 130-160 ℃, the powder cannot be adhered to the iron sheet when the temperature is too low, the powder is easy to agglomerate when the temperature is too high, and the agglomerated powder can block the spray head when being recovered.

Alternatively, T1 may be: 130 ℃, 140 ℃, 145 ℃, 150 ℃ or 160 ℃.

S300: carrying out fixed-point electrostatic powder spraying on the part to be sprayed of the preheated metal container;

specifically, the fixed point powder spraying structure 10 in any of the foregoing embodiments may be used to perform fixed point electrostatic powder spraying on the part to be sprayed of the preheated metal container, where the charged voltage of the powder may be 2 to 10 ten thousand volts.

S400: and after the spraying is finished, heating the powder coating at the part to be sprayed of the metal container to a preset temperature and preserving heat for a preset time.

Specifically, the fixed-point powder spraying structure 10 in any of the foregoing embodiments may be used to heat the powder coating at the to-be-sprayed portion of the metal container to a predetermined temperature and for a predetermined time, so that the powder coating can be cured, and the structural stability of the powder coating at the to-be-sprayed portion of the metal container is improved.

In one embodiment, in step S300, the powder coating is heated to a temperature T2, where 200 ℃. ltoreq.T 1. ltoreq.260 ℃. The hot-melt powder coating provided in the market at present has the curing temperature of 200-260 ℃ generally, and the colors of printed or film-coated patterns on the outer walls of some containers are sensitive to the temperature, and the low-temperature section temperature is preferably adopted to avoid color change but cannot be lower than 200 ℃. The printed pattern does not change color when the temperature is reduced, but the relative heating time is prolonged. For a container without printing, the heating time can be shortened by adopting the temperature of a high-temperature section, and the length of the oven is further shortened.

Alternatively, T2 may be: 200 ℃, 230 ℃, 240 ℃, 250 ℃ or 260 ℃.

In one embodiment, in step S300, the preset duration is T, where T is 15S to 25S. Within this range. The powder coating is generally a polyester type powder coating which is thermoplastic and melts at a temperature of 260 ℃ in 10S, but is preferably set to 15S in view of the small time required for leveling. When T is less than or equal to 15s, the melting temperature needs to be increased. When T is more than or equal to 25s, the temperature can be reduced, but the power consumption is correspondingly increased due to overlong heating time, and the energy consumption is larger. .

Alternatively, T may be: 15s, 20s or 25 s.

When the fixed-point powder spraying and curing method is used, the part to be sprayed of the metal container is preheated, when the powder coating is sprayed on the part to be sprayed, the bottom layer powder coating which is firstly contacted with the part to be sprayed is melt-adhered to the side wall of the metal container 40, because the metal container 40 is generally grounded (can be grounded through a metal brush), the bottom layer powder coating can release static electricity, and the powder coating with high-voltage static electricity which is sprayed subsequently can be more easily combined on the bottom layer powder coating without the powder scattering condition caused by mutual repulsion of charges with the same kind, so that the thickness of the powder coating at the part to be sprayed of the metal container can be increased; after the spraying is finished, the powder coating at the position to be sprayed of the metal container is heated and insulated to be solidified, so that the bonding stability of the powder coating is improved.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.