A workpiece coating anti-pollution device with a door end cavity and an anti-pollution method thereof

Abstract

The application relates to a workpiece coating anti-pollution transfer device with a door end cavity and an anti-pollution method thereof, which comprises a positioning frame, a first shielding strip, a first locating mechanical hand and a second locating mechanical hand; the first locating mechanical hand and the second locating mechanical hand are fixedly connected with the positioning frame; a first shielding strip is arranged between a first traction part and a second traction part, and the first shielding strip is used for filling the gap between the door end of the workpiece and the main body of the workpiece. Through the arrangement of the locating mechanical hands, the gap between the door end and the main body of the workpiece can be quickly shielded, coating pollution can be effectively prevented, the automation degree is high, and the operation is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coating, in particular to a workpiece coating anti-pollution device for a workpiece with a door end cavity and an anti-pollution method thereof. BACKGROUND

[0002] Currently, the coating gap of the workpiece with a door end cavity is not shielded. Since the color requirements inside and outside the workpiece with a door end cavity are inconsistent, the coating outside will enter the inside along the gap during coating, thereby polluting the inside coating. The inside coating needs to be repaired manually, causing waste of labor and coating.

[0003] The production automation of the workpiece with a door end cavity is the future trend. The development of the door end coating anti-pollution of the workpiece with a door end cavity is in a relatively primitive stage. Currently, the inside pollution of the cavity is mainly prevented by manually disassembling and assembling the gap shielding tool. The manual disassembly and assembly of the door end shielding tool is low in efficiency and unsafe.

[0004] Therefore, there is an urgent need for a door end cavity workpiece coating anti-pollution device and an anti-pollution method thereof, which are high in automation and convenient to use, to solve the above problems. SUMMARY

[0005] To alleviate or solve at least one aspect or at least one point of the above problems, the present application is proposed.

[0006] The present application provides a workpiece coating anti-pollution device for a workpiece with a door end cavity, comprising: a positioning frame, a first shielding strip, a first locating mechanical hand, a second locating mechanical hand, and a spraying device; the first shielding strip is a flexible sealing strip; the spraying device is fixed on the positioning frame; the first locating mechanical hand and the second locating mechanical hand are fixedly connected with the positioning frame; the first locating mechanical hand and the second locating mechanical hand are floating; the first locating mechanical hand comprises a first locating part, a first adjusting part, and a first traction part, and the first adjusting part is connected with the positioning frame; the first locating part is arranged on the first adjusting part, and the first locating part can be adjusted in position within a first predetermined range through the first adjusting part; the first traction part is arranged on the first locating part and can move together with the first locating part; the first adjusting part is a position compensation part, which can adjust the position in x, y, and z directions of three-dimensional space; the second locating mechanical hand comprises a second locating part, a second adjusting part, and a second traction part, and the second adjusting part is connected with the positioning frame; the second locating part is arranged on the second adjusting part, and the second locating part can be adjusted in position within a second predetermined range through the second adjusting part; the second traction part is arranged on the second locating part and can move together with the second locating part; the second adjusting part is a position compensation part, which can adjust the position in x, y, and z directions of three-dimensional space; the first shielding strip is arranged between the first traction part and the second traction part, and the first shielding strip can move with the movement of the first traction part and the second traction part; the first shielding strip is used to fill the gap between the door end of the workpiece and the main body of the workpiece.

[0007] The present application adjusts the positions of the first and second locating parts through the adjustment of the first and second adjusting parts, and further adjusts the positions of the first and second traction parts, so that the first shielding strip between the first and second traction parts can be installed in the gap between the door end of the workpiece and the main body of the workpiece. Through the above arrangement, at least one shielding strip in the gap between the door end and the main body of the workpiece can be provided, which can effectively prevent coating pollution, has high automation degree and is convenient to operate.

[0008] In order to achieve better shielding effect, the present application further provides the following preferred technical solutions:

[0009] Preferably, the third locating manipulator comprises a third locating part, a third adjusting part and a third traction part, the third locating part can be adjusted in position within a third predetermined range through the third adjusting part, and the third traction part can move together with the third locating part; and the fourth locating manipulator comprises a fourth locating part, a fourth adjusting part and a fourth traction part, the fourth locating part can be adjusted in position within a fourth predetermined range through the fourth adjusting part, and the fourth traction part can move together with the fourth locating part; a second shielding strip is arranged between the second traction part and the third traction part, a third shielding strip is arranged between the third traction part and the fourth traction part, and a fourth shielding strip is arranged between the fourth traction part and the first traction part; and a fifth shielding strip is further connected between the second shielding strip and the fourth shielding strip.

[0010] Preferably, the pressing device is used for pressing at least one of the first, second, third, fourth and fifth shielding strips into the above gap.

[0011] Preferably, the third adjusting part and the fourth adjusting part are both position compensation members, which can adjust the positions in x, y and z directions in three-dimensional space.

[0012] Preferably, the first locating part comprises a first guide part, the second locating part comprises a second guide part, the third locating part comprises a third guide part, and the fourth locating part comprises a fourth guide part; through the first, second, third and fourth guide parts, the first, second, third and fourth locating parts can be guided into four matching parts of the workpiece respectively.

[0013] Preferably, the first, second, third and fourth guide parts each comprise four guide pieces arranged in a cross shape, and each guide piece comprises a guide slope; and the matching part is a groove, which is provided with an arc-shaped guide surface matched with the guide slope.

[0014] Preferably, one end of the first traction part, the second traction part, the third traction part and the fourth traction part is fixedly connected with a guide corner part for guiding the first shielding strip, the second shielding strip, the third shielding strip and the fourth shielding strip into the gap, and the guide corner part is formed with a guide angle matched with the gap.

[0015] Preferably, the positioning frame comprises a first support and a second support, the first positioning manipulator and the fourth positioning manipulator are located at two ends of the first support, the second positioning manipulator and the third positioning manipulator are located at two ends of the second support, the length of the first support and the second support is substantially equal to the width of the workpiece door end, and the longitudinal distance between the first support and the second support is substantially equal to the height of the workpiece door end.

[0016] Preferably, the workpiece is a container.

[0017] In addition, the application also provides a workpiece coating anti-pollution method with a door end cavity, comprising the following steps: shielding the gap between the door end of the workpiece and the main body of the workpiece by using the anti-pollution device; and performing coating operation on the door end of the workpiece.

[0018] Preferably, the container slowly approaches the anti-pollution shielding device with a door end cavity along the length direction of the container, when the positioning manipulator contacts the door end corner part port of the container, the guide slope of the positioning manipulator automatically adjusts in the XY direction according to the position deviation of the container, and when the container is parked in place, the positioning manipulator floats along the Z axis direction according to the position of the container and is finally positioned.

[0019] Preferably, the positioning manipulator and the container door end corner part are finally positioned at the same time, the guide angle of the guide corner part automatically guides into the door gap along the door edge and the door frame edge, so as to ensure that the door gap positioning mechanism reliably enters the door gap.

[0020] The application can quickly shield the gap between the door end and the main body of the workpiece by the setting of the positioning manipulator, can effectively prevent coating pollution, has high automation degree and is convenient to operate. Further, the application can make the shielding more rigorous by the setting of the pressing device, can guide the positioning part to a suitable position by the setting of the guide slope, has high positioning efficiency. The adjusting part can conveniently adjust the position in three directions by the setting of the elastic component, has simple structure and is convenient to adjust. The shielding strip can be accurately installed into the gap by the setting of the guide corner part.

[0021] The application can simultaneously realize sealing in four directions of up, down, left and right by the cooperation of the third and fourth positioning manipulators with the first and second positioning manipulators, and can simultaneously realize gap sealing in the middle by the setting of the fifth shielding strip. The application is especially suitable for shielding of containers, and can realize one-time shielding by the above-mentioned mode, is simple to operate and improves efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A schematic view of a workpiece coating anti-pollution device with door end cavity for an exemplary embodiment of the present application.

[0023] Figure 2 A partial enlarged view of A in Figure 1

[0024] Figure 3 A schematic view of a workpiece coating anti-pollution device with door end cavity for an exemplary embodiment of the present application for spraying a container.

[0025] Figure 4 A partial enlarged view of the left side of the container in Figure 3

[0026] Wherein: 1- first locating mechanical hand, 2- second locating mechanical hand, 3- third locating mechanical hand, 4- fourth locating mechanical hand; 5- first adjusting part, 6- first locating part, 7- first traction part, 8- second adjusting part, 9- second locating part, 10- second traction part, 11- third adjusting part, 12- third locating part, 13- third traction part, 14- fourth adjusting part, 15- fourth locating part, 16- fourth traction part; 17- first shielding strip, 18- second shielding strip, 19- third shielding strip, 20- fourth shielding strip, 21- fifth shielding strip; 22- first support, 23- second support, 24- pressing device, 25- spraying device, 26- positioning frame, 27- workpiece main body, 28- door end, 29- gap, 30- matching part, 31- hinge, 32- guide inclined surface, 33- spring, 34- guide angle part, 35- door stop. DETAILED DESCRIPTION

[0027] The following description of the embodiments of the present application with reference to the accompanying drawings is provided to explain the overall inventive concept of the present application and should not be understood as a limitation thereof. In the present application, the same reference numerals are used to designate the same or similar components.

[0028] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and fully convey the scope of the methods, devices and / or systems described herein to one of ordinary skill in the art, and that will fully convey the scope of the methods, devices and / or systems to those skilled in the art.

[0029] ​​Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers and / or sections, such elements, components, regions, layers and / or sections should not be limited by these terms. Instead, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section.

[0030] In the description, when an element such as a layer, a region, or a substrate is referred to as being "on" another element, "connected to" or "coupled to" another element, it can be directly on, directly connected to, or directly coupled to the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", or "directly coupled to" another element, there are no other elements interposed therebetween.

[0031] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" are meant to be inclusive and are intended to specify the presence of stated features, integers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, operations, components, elements, and / or combinations thereof.

[0032] In order to enable any person skilled in the art to use the content of the present disclosure, the following exemplary embodiments can be given below in connection with specific application scenarios, parameters of specific systems, devices and elements, and specific connection manners. However, for those skilled in the art, these embodiments are only examples, and the general principles defined herein can be applied to other embodiments and application scenarios without departing from the spirit and scope of the present disclosure.

[0033] According to one exemplary embodiment of the present disclosure: as Figures 1-4As shown, the present application provides a kind of door end 28 cavity workpiece coating pollution prevention device, wherein door end 28 refers to the component that can be opened or closed relative to workpiece main body 27, also can be called door.It includes positioning frame 26, first shielding strip 17, first locating mechanical hand 1, second locating mechanical hand 2 and pressing device 24;First locating mechanical hand 1 and second locating mechanical hand 2 are fixedly connected with positioning frame 26;First locating mechanical hand 1 includes first locating part 6, first adjusting part 5, first traction part 7, first locating part 6 can be adjusted in position in first predetermined range by first adjusting part 5, and first traction part 7 can move along with first locating part 6;Second locating mechanical hand 2 includes second locating part 9, second adjusting part 8, second traction part 10, second locating part 9 can be adjusted in position in second predetermined range by second adjusting part 8, and second traction part 10 can move along with second locating part 9;First shielding strip 17 is arranged between first traction part 7 and second traction part 10, and first shielding strip 17 is used to fill the gap 29 between door end 28 of workpiece and workpiece main body 27.

[0034] The present application adjusts the position of first locating part 6 and second locating part 9 by adjusting first adjusting part 5 and second adjusting part 8, and further adjusts the position of first traction part 7 and second traction part 10, so as to install first shielding strip 17 between first traction part 7 and second traction part 10 in the gap 29 between door end 28 of workpiece and workpiece main body 27.Through the above setting, at least one shielding strip can be installed in the gap 29 between door end 28 and workpiece main body 27, which can effectively prevent coating pollution, has high degree of automation and is convenient to operate.

[0035] According to an exemplary embodiment of the present application: Figures 1-4As shown, the third positioning manipulator 3 comprises a third positioning part 12, a third adjusting part 11, and a third traction part 13, the third positioning part 12 can be positionally adjusted within a third predetermined range through the third adjusting part 11, and the third traction part 13 can move together with the third positioning part 12; and the fourth positioning manipulator 4 comprises a fourth positioning part 15, a fourth adjusting part 14, and a fourth traction part 16, the fourth positioning part 15 can be positionally adjusted within a fourth predetermined range through the fourth adjusting part 14, and the fourth traction part 16 can move together with the fourth positioning part 15; a second shielding strip 18 is arranged between the second traction part 10 and the third traction part 13, a third shielding strip 19 is arranged between the third traction part 13 and the fourth traction part 16, and a fourth shielding strip 20 is arranged between the fourth traction part 16 and the first traction part 7; and a fifth shielding strip 21 is further connected between the second shielding strip 18 and the fourth shielding strip 20. Through the above arrangement, the first to fifth shielding strips 21 can be simultaneously installed into the gaps 29 through one-time operation, thereby improving the operation efficiency. Preferably, the workpiece is a container. There are five gaps 29 between the door end 28 of the container and the workpiece body 27, one at the top, one at the bottom, one at the left, one at the right, and one in the middle. Through the above arrangement, the five shielding strips are simultaneously installed into the above five gaps 29, thereby improving the installation efficiency.

[0036] According to an exemplary embodiment of the present application: Figures 1-4 As shown, the first adjusting part 5, the second adjusting part 8, the third adjusting part 11, and the fourth adjusting part 14 are all position compensation members, which can adjust the positions in the three-dimensional space x, y, z directions. Optionally, the first adjusting part 5, the second adjusting part 8, the third adjusting part 11, and the fourth adjusting part 14 all comprise elastic assemblies, which are used to adjust the positions of the corresponding first positioning part 6, second positioning part 9, third positioning part 12, and fourth positioning part 15. Optionally, the elastic assembly is a spring 33, through the stretching and swinging of the spring 33, the position adjustment of the above-mentioned positioning parts can be realized. The above-mentioned positioning parts are all movable, and can freely float along the X, Y, Z axes through the movement of the above-mentioned adjusting parts.

[0037] According to an exemplary embodiment of the present application: Figures 1-4 As shown, the first adjusting part 5, the second adjusting part 8, the third adjusting part 11, and the fourth adjusting part 14 are all position compensation members, which can adjust the positions in the three-dimensional space x, y, z directions. Optionally, the first adjusting part 5, the second adjusting part 8, the third adjusting part 11, and the fourth adjusting part 14 all comprise elastic assemblies, which are used to adjust the positions of the corresponding first positioning part 6, second positioning part 9, third positioning part 12, and fourth positioning part 15. Optionally, the elastic assembly is a spring 33, through the stretching and swinging of the spring 33, the position adjustment of the above-mentioned positioning parts can be realized. The above-mentioned positioning parts are all movable, and can freely float along the X, Y, Z axes through the movement of the above-mentioned adjusting parts.

[0038] According to an exemplary embodiment of the present application: Figures 1-4As shown, the first locating part 6 to the fourth locating part 15 can each include a guide part, through which the first locating part 6 to the fourth locating part 15 can be guided into the four matching parts 30 of the workpiece. Preferably, the matching part 30 is a groove, and when the workpiece is a container, the matching part 30 can be a corner piece port. Preferably, the guide part includes four guide pieces arranged in a cross shape, and each guide piece includes a guide slope 32.

[0039] The first locating part 6 to the fourth locating part 15 have a first guide angle in the X-axis direction, the first guide angle is 0-90 degrees, and the X-axis movement range is + - 100mm. There is a second guide angle in the Y-axis direction, the second guide angle is 0-90 degrees, and the Y-axis movement range is + - 100mm. The first guide angle and the second guide angle are the oblique angles formed by the guide slope 32. The first locating part 6, the second locating part 9, the third locating part 12, and the fourth locating part 15 have a Z-axis extension range of 0-100mm. As shown, Figure 2 As shown, each of the first locating part 6, the second locating part 9, the third locating part 12, and the fourth locating part 15 includes a guide part and a connecting plate, one end of the connecting plate is fixedly connected with the corresponding guide part, and the other end is fixedly connected with the corresponding traction part.

[0040] According to an exemplary embodiment of the present application: as shown, Figures 1-4 As shown, one end of the first traction part 7, the second traction part 10, the third traction part 13, and the fourth traction part 16 is fixedly connected with a guide corner part 34 for guiding the first shielding strip 17, the second shielding strip 18, the third shielding strip 19, and the fourth shielding strip 20 into the gap 29, and the guide corner part 34 forms a guide angle that can cooperate with the gap 29. As shown, Figure 2 As shown, the guide corner part 34 is four, and the guide corner part 34 is generally L-shaped, each guide corner part 34 includes a first guide angle and a second guide angle. Optionally, the first guide angle is 0-90 degrees, and the second guide angle is 0-90 degrees. The first guide angle is opposite to the door frame, and the second guide angle is opposite to the door, which facilitates the door gap positioning mechanism to enter the door gap, thereby ensuring that the vertical projection of the shielding strip is entirely or partially in the door gap.

[0041] According to an exemplary embodiment of the present application: as shown, Figures 1-4 As shown, the shielding strip is a flexible sealing strip, and the pressing device 24 is a mechanism for sealing the flexible shielding strip at the door hinge and the door buckle.

[0042] According to an exemplary embodiment of the present application: as shown, Figures 1-4 As shown, the spraying device 25 includes a reciprocating machine, which is an up-down reciprocating mechanism for spraying the door end 28. Figure 1 As shown, the spraying device 25 is fixed on the positioning frame 26.

[0043] According to an example embodiment of the present application, as shown in Figures 1-4 The positioning frame 26 includes a first support 22 and a second support 23, the first positioning manipulator and the fourth positioning manipulator are located at two ends of the first support 22, the second positioning manipulator and the third positioning manipulator are located at two ends of the second support 23, the length of the first support 22 and the second support 23 is substantially equal to the width of the door, and the longitudinal distance between the first support 22 and the second support 23 is substantially equal to the length of the door. Through the above arrangement, the first adjusting member, the second adjusting member, the third adjusting member and the fourth adjusting member only need to be finely adjusted, and accurate positioning can be achieved, thereby improving the efficiency.

[0044] According to an example embodiment of the present application, as shown in Figures 1-4 The present application also provides a method for preventing pollution during coating of a workpiece with a door end 28 cavity, which comprises the following steps: shielding the gap 29 between the door end 28 of the workpiece and the main body 27 of the workpiece by using the above-mentioned pollution prevention device; and performing coating operation on the door end 28 of the workpiece.

[0045] The working process of the present application will be described below with reference to the accompanying drawings and in conjunction with the example of spraying of a container: Figures 1-4

[0046] As shown in Figures 1-4 The pollution prevention shielding device with a door end 28 cavity of the present application has at least four positioning manipulators at the door end 28 of the container, and the four positioning manipulators are floating.

[0047] The door end 28 of the container and the main body 27 of the workpiece are rotatably connected through a hinge 31, and are fixed by a door end 28 fixer when the door of the container is closed; wherein the fixer can be a door stop 35, and the container slowly approaches the pollution prevention shielding device with a door end 28 cavity along the length direction of the container.

[0048] When the positioning manipulator contacts the corner port of the door end 28 of the container, the guide slope 32 of the positioning manipulator will automatically adjust in the XY direction according to the position deviation of the container, and when the container is positioned, the positioning manipulator will float along the Z axis direction to finally position. In the present application, the X direction is the width direction of the container body, the Y direction is the height direction of the container body, and the Z direction is the length direction of the container body.

[0049] When the positioning manipulator finally positions the corner of the door end 28 of the container, the guide angle of the guide corner part 34 will automatically guide the door seal along the door edge and the door frame edge, so as to ensure that the door gap positioning mechanism reliably enters the door gap. Since the flexible shielding strip is fixedly connected with the door gap positioning mechanism, the four corner points of the flexible shielding strip enter the door gap, and according to the principle of two-point-one-line, the vertical projection of the flexible shielding strip is all or partially in the door gap.

[0050] ​Since the container door seal has protruding door hinges and door buckles, the shielding strip cannot enter the door gap. In order to ensure that the shielding strip can enter the door seal, the shielding strip is flexible, and a pressing device 24 is arranged at the door hinge and the door buckle. The protrusions of the door hinge and the door buckle can be deformed and wrapped, so as to ensure the reliable sealing of the door gap.

[0051] The anti-pollution shielding device with the door end 28 cavity of the application has simple structure, automatically locates, eliminates manual disassembly of the door seal, and can realize automatic anti-pollution coating of the door end 28. The structure is simple, and the degree of automation is high.

[0052] Although embodiments of the present application have been shown and described, it is to be understood that the embodiments are not limiting, and that changes can be made to these embodiments without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A door end (28) chamber workpiece coating anti-pollution device, characterized in that: The utility model relates to a kind of positioner, which comprises: Positioning frame (26), first shielding strip (17), first locating manipulator (1), second locating manipulator (2), spraying device (25); First shielding strip (17) is flexible sealing strip; Spraying device (25) is fixed on positioning frame (26); First locating manipulator (1) and second locating manipulator (2) are fixedly connected with positioning frame (26);First locating manipulator (1) and second locating manipulator (2) are floating; First locating manipulator (1) comprises first locating part (6), first adjusting part (5), first traction part (7);First adjusting part (5) is connected with positioning frame (26);First locating part (6) is arranged on first adjusting part (5), and first locating part (6) can be adjusted in position within first predetermined range by first adjusting part (5), and first traction part (7) is arranged on first locating part (6), and can move with first locating part (6);First adjusting part (5) is position compensation part, which can adjust the position of three-dimensional space x, y, z direction; Second locating manipulator (2) comprises second locating part (9), second adjusting part (8), second traction part (10);Second adjusting part (8) is connected with positioning frame (26);Second locating part (9) is arranged on second adjusting part (8), and second locating part (9) can be adjusted in position within second predetermined range by second adjusting part (8), and second traction part (10) is arranged on second locating part (9), and can move with second locating part (9);Second adjusting part (8) is position compensation part, which can adjust the position of three-dimensional space x, y, z direction; First traction part (7) and second traction part (10) are provided with first shielding strip (17), and first shielding strip (17) can move with the movement of first traction part (7) and second traction part (10), and first shielding strip (17) is used to fill the gap (29) between door end (28) of workpiece and main body (27) of workpiece.

2. The contamination protection device of claim 1, wherein: It also comprises third locating manipulator (3) and fourth locating manipulator (4);Third locating manipulator (3) comprises third locating part (12), third adjusting part (11), third traction part (13), third locating part (12) can be adjusted in position within third predetermined range by third adjusting part (11), and third traction part (13) can move with third locating part (12);And fourth locating manipulator (4) comprises fourth locating part (15), fourth adjusting part (14), fourth traction part (16), fourth locating part (15) can be adjusted in position within fourth predetermined range by fourth adjusting part (14), and fourth traction part (16) can move with fourth locating part (15);Second traction part (10) and third traction part (13) are provided with second shielding strip (18), third traction part (13) and fourth traction part (16) are provided with third shielding strip (19), and fourth traction part (16) and first traction part (7) are provided with fourth shielding strip (20);Second shielding strip (18) and fourth shielding strip (20) are further connected with fifth shielding strip (21).

3. The contamination protection device of claim 2, wherein: Further comprising a pressing device (24) for pressing at least one of the first shielding strip (17), the second shielding strip (18), the third shielding strip (19), the fourth shielding strip (20) and the fifth shielding strip (21) into the gap (29).

4. The contamination protection device of claim 2, wherein: The third adjusting part (11) and the fourth adjusting part (14) are position compensation members, which can adjust the positions in the three-dimensional space x, y and z directions.

5. The contamination protection device of claim 2, wherein: The first locating part (6) comprises a first guide part, the second locating part (9) comprises a second guide part, the third locating part (12) comprises a third guide part, and the fourth locating part (15) comprises a fourth guide part; the first locating part (6), the second locating part (9), the third locating part (12) and the fourth locating part (15) can be guided into the four matching parts (30) of the workpiece through the first guide part, the second guide part, the third guide part and the fourth guide part.

6. The contamination protection device of claim 5, wherein: The first guide part, the second guide part, the third guide part and the fourth guide part each comprise four guide pieces arranged in a cross shape, and each guide piece comprises a guide inclined surface (32); the matching part (30) is a groove, and an arc-shaped guide surface matched with the guide inclined surface (32) is arranged in the groove.

7. The contamination protection device of claim 2, wherein: One end of the first traction part (7), the second traction part (10), the third traction part (13) and the fourth traction part is fixedly connected with a guide angle part (34) for guiding the first shielding strip (17), the second shielding strip (18), the third shielding strip (19) and the fourth shielding strip (20) to enter the gap (29), and a guide angle matched with the gap (29) is formed on the guide angle part (34).

8. The contamination protection device of claim 2, wherein: The positioning frame (26) comprises a first support (22) and a second support (23), the first positioning manipulator and the fourth positioning manipulator are located at two ends of the first support (22), the second positioning manipulator and the third positioning manipulator are located at two ends of the second support (23), the lengths of the first support (22) and the second support (23) are substantially equal to the width of the workpiece door end (28), and the longitudinal distance between the first support (22) and the second support (23) is substantially equal to the height of the workpiece door end (28).

9. The contamination protection device according to any one of claims 1 to 8, characterized in that: The workpiece is a container.

10. A method of preventing contamination during coating of a workpiece having a chamber with a door end (28), characterized by: The method comprises the following steps: shielding the gap (29) between the door end (28) and the main body (27) of the workpiece by using the anti-pollution device according to any one of claims 1-9; and performing a coating operation on the door end (28) of the workpiece.

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