Floating type prime coat brushing mechanism and prime coat device

Abstract

The utility model discloses a floating type prime coat brushing mechanism and a prime coat device, and relates to the technical field of brushing equipment.The brushing mechanism comprises a floating assembly, the floating assembly comprises a fixed part fixedly connected with prime coat equipment and a floating part movably arranged relative to the fixed part, and the floating part moves in the direction facing or away from equipment to be brushed; a brush head for brushing is arranged on the floating part; the device further comprises a pressure assembly, the pressure assembly comprises a springback piece connected with the floating part, and within the preset movement range of the floating part, the floating part extrudes the springback piece so that the springback piece can generate springback force overcoming extrusion of the floating part. Separation of the brush head and the heavy body of the prime coating equipment is achieved through the floating assembly, floating arrangement of the brush head can be achieved, the position of the brush head relative to a vehicle body is stable, and the problem that the prime coating effect is poor due to the height deviation amount and the curved surface deformation amount of the vehicle body is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of painting equipment, in particular to a floating type primer painting mechanism and a primer painting device. BACKGROUND

[0002] In a vehicle production process, primer painting is an indispensable step in vehicle assembly, which can make the surface of a glass box vehicle rough by painting a layer of corrosive liquid on the vehicle body, increase the adhesion of glass glue, and make the front and rear glass components, such as a sunroof and side window, and plastic parts, such as a trim panel, have better adhesion to the vehicle body.

[0003] In the existing primer painting process, the painting head usually uses two types of brushes and felt. The felt is relatively hard and is suitable for painting on a relatively flat glass surface. The brush is soft and has strong deformation ability and is suitable for painting on uneven vehicle body sheet metal. Due to the dimensional deviation (±1.5 mm) in the manufacturing process of the vehicle body sheet metal, a total deviation of 3 mm can cause unstable painting tracks and glue width. Under the condition of meeting the process requirements, the compatible deformation amount of the brush is ±0.5 mm, and the vehicle body has a curved surface. The existing primer painting equipment is heavy and is not convenient to move up and down, so the compatible deformation amount of the brush cannot cope with the height deviation and curved surface deformation of the vehicle body.

[0004] Therefore, in view of the above technical problems, how to make the deformation amount of the brush meet the height deviation and curved surface deformation of the vehicle body is a technical problem to be solved by those skilled in the art. CONTENT OF THE INVENTION

[0005] The application aims to provide a floating type primer painting mechanism and a primer painting device. The brush head is separated from the heavy body of the primer painting equipment through a floating assembly, the brush head is floatingly arranged, the position of the brush head relative to the vehicle body is stable, and the problem of poor primer painting effect caused by the height deviation and curved surface deformation of the vehicle body is solved.

[0006] To achieve the above-mentioned purpose, the application provides a floating type primer painting mechanism, which comprises a floating assembly. The floating assembly comprises a fixed part fixedly connected with a primer painting equipment and a floating part movably arranged relative to the fixed part. The floating part moves in a direction facing or away from the equipment to be painted. A brush head for painting is arranged on the floating part.

[0007] The application further comprises a pressure assembly, which comprises a resilient member connected with the floating part. Within a preset movement range of the floating part, the floating part extrudes the resilient member, so that the resilient member generates a resilient force overcoming the extrusion of the floating part.

[0008] Preferably, the fixed part comprises a key and a mounting block fixed on the key, the floating part comprises a spline shaft movably arranged inside the key and forming a ball spline with the key, the spline shaft is movable relative to the key in the axial direction, and one end of the spline shaft is connected to the brush head.

[0009] Preferably, the other end of the spline shaft is provided with a limiting piece, and the outer periphery of the limiting piece is provided with a snap ring axially clamped with the key to limit the movable range of the spline shaft in the direction facing the equipment to be painted.

[0010] Preferably, the pressure assembly further comprises a mounting seat arranged on the fixed part, the spring is arranged on the mounting seat, and the spring end is connected with the limiting piece.

[0011] Preferably, the mounting seat has a hollow cavity, the spring is arranged in the hollow cavity, a threaded adjusting pressure rod is arranged on the mounting seat, one end of the adjusting pressure rod extends into the hollow cavity, a limiting ring is arranged on the outer periphery of the adjusting pressure rod extending into the hollow cavity, one end of the spring is connected with the limiting ring, and the other end of the spring is connected with the snap ring, and the adjusting pressure rod is rotated to adjust the compression amount of the spring.

[0012] Preferably, the hollow cavity is provided with a stroke cavity near one end of the fixed part, the diameter of the stroke cavity is greater than the diameter of the hollow cavity, the snap ring extends into the stroke cavity and moves within the axial range of the stroke cavity.

[0013] Preferably, it further comprises a mounting plate and a three-dimensional adjusting piece arranged on the mounting plate, the mounting plate is fixedly connected with the primer equipment, the fixed part is fixedly arranged on the three-dimensional adjusting piece, and the three-dimensional adjusting piece is used for adjusting the position of the floating assembly in x-axis, y-axis and z-axis.

[0014] Preferably, the three-dimensional adjusting piece comprises at least three groups of adjusting blocks, the first group of adjusting blocks is fixedly connected with the mounting plate, adjusting spacers are arranged between the second group of adjusting blocks and the first group of adjusting blocks, between the third group of adjusting blocks and the second group of adjusting blocks, and between the fixed part and the third group of adjusting blocks, and the thickness of the adjusting spacers is adjusted to change the position of the floating assembly in x-axis, y-axis and z-axis.

[0015] Preferably, it further comprises a brush connecting piece, the brush connecting piece comprises:

[0016] a liquid inlet connector, one end of which is connected with the floating part, the liquid inlet connector has a hollow channel inside, and the outer surface of the liquid inlet connector is provided with a liquid inlet communicated with the hollow channel;

[0017] An installation joint is sealingly arranged at the other end of the liquid inlet joint, and a liquid outlet channel is arranged in the installation joint and communicates with the hollow channel, and a brush head is sealingly arranged at the end of the installation joint and communicates with the liquid outlet channel.

[0018] Preferably, the brush head is interference fitted with the installation joint, and a buffer cavity is arranged between the brush head and the liquid outlet channel, and the liquid passes through the buffer cavity before entering the brush head.

[0019] Preferably, a liquid supply assembly is further included, which comprises a screw dispensing valve and a pipeline connecting the liquid outlet of the screw dispensing valve and the liquid inlet, and the screw dispensing valve is fixed on the installation plate.

[0020] A primer coating device comprises the floating primer coating brush mechanism.

[0021] With respect to the background art, the fixed part of the floating assembly is connected with the primer coating device, and the floating part of the floating assembly is connected with the brush head, so that the brush head can be movably arranged relative to the primer coating device on the basis that the floating part is movable relative to the fixed part, thereby realizing the floating effect of the brush head. The light-weight brush head is connected with the primer coating device through the floating assembly, is separated from the heavy body of the primer coating device, can make the position of the brush head and the vehicle body relatively stable, and under the action of the pressure assembly, the floating part has a certain pre-pressure, thereby ensuring that the brushing effect of the brush head is more stable, and the problem of the fluctuation of the glue width and the primer coating liquid is solved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0023] Figure 1 The floating primer coating brush mechanism provided by the embodiments of the present application is shown in the structural schematic diagram.

[0024] Figure 2 The pressure assembly, the floating assembly, and the brush connecting piece connection structure provided by the embodiments of the present application are shown in the structural schematic diagram.

[0025] Figure 3 The three-dimensional adjusting piece structure provided by the embodiments of the present application is shown in the structural schematic diagram.

[0026] In the figure: 1-floating assembly; 11-fixed part; 111-key mother; 112-mounting block; 12-floating part; 121-spline shaft; 122-limiting piece; 123-clasp ring;

[0027] 2-brush connecting piece; 21-liquid inlet connector; 211-hollow channel; 212-liquid inlet; 22-mounting connector; 221-liquid outlet channel; 23-buffer cavity;

[0028] 3-brush head;

[0029] 4-pressure assembly; 41-mounting seat; 42-hollow cavity; 43-adjusting pressure rod; 44-limiting ring; 45-stroke cavity;

[0030] 5-three-dimensional adjusting piece; 51-adjusting block; 52-adjusting gasket;

[0031] 6-mounting plate;

[0032] 7-liquid supply assembly; 71-screw point glue valve; 72-pipeline. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] It should be noted that in the present embodiment, the directions or position relationships indicated by "up", "down", "front", "back" and the like are the directions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", "fourth" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0035] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0036] As Figure 1As shown, in the embodiment, a floating base coating brushing mechanism is provided, which comprises a floating assembly 1, the floating assembly 1 comprises a fixed part 11 fixedly connected with a base coating device and a floating part 12 movably arranged relative to the fixed part 11, the base coating device itself has a heavy body part, through the arrangement of the floating assembly 1, the floating part 12 can be movably arranged relative to the heavy body part of the base coating device; on this basis, the floating part 12 is provided with a brush head 3 for brushing, so that the light-weight brush head 3 can be separated from the heavy body part of the base coating device, the movable arrangement of the brush head 3 is realized, and the sensitivity of the up-down movement of the brush head 3 is improved.

[0037] It should be pointed out that the movement direction of the floating part 12 is the direction facing or away from the device to be brushed, so that the brush head 3 can be movably arranged in this direction, and the position of the brush head 3 is adaptively adjusted under the action of the pressure assembly 4 when the brush head 3 is coping with the processing deviation of the device to be brushed (vehicle body) and the curved vehicle body, so as to obtain more stable brushing effect.

[0038] Specifically, the mechanism further comprises a pressure assembly 4, the pressure assembly 4 comprises a rebounding piece connected with the floating part 12, the main function of the rebounding piece is to provide a certain rebounding force for the floating part 12 and the brush head 3; when the brush head 3 contacts with the device to be brushed, the brush head 3 will generate a certain rebounding force due to extrusion, and the rebounding force of the rebounding piece can overcome the rebounding force of the brush head 3 to a certain extent, so that the brush head 3 and the device to be brushed maintain a certain degree of contact, thereby ensuring that the brush head 3 can be compatible with a larger range of deformation.

[0039] It should be pointed out that the rebounding force range of the brush is determined by actual test, that is, the pre-pressing position of the brush is determined by experiment when the brushing effect meets the production, and the rebounding force range of the brush is tested at the pre-pressing position; the rebounding force is taken as a design index, and the movement amount of the floating part 12 is set according to the body deviation and the curved surface deviation, the movement amount of the floating part 12 is also the movement amount of the brush head 3, within the movement amount range, the floating part 12 can extrude the rebounding piece, so that the rebounding piece generates a rebounding force to overcome the extrusion of the floating part 12, that is, to overcome the rebounding force of the brush head 3.

[0040] Through the above arrangement, the brush head 3 can have more stable brushing effect relative to the device to be brushed, and the problems of large and small glue width and thick and thin base coating liquid can be avoided. At the same time, according to the rebounding force and the actual movement demand of the floating part 12, the compression amount of the rebounding piece can be adjusted, so as to change the accurate adjustment of the floating pre-pressing force of the floating part 12.

[0041] In combination with the above embodiments, the fixed part 11 in the floating assembly 1 is connected with the primer equipment, and the floating part 12 in the floating assembly 1 is connected with the brush head 3, so that the brush head 3 can be movably arranged relative to the primer equipment on the basis that the floating part 12 moves relative to the fixed part 11, and the floating effect of the brush head 3 is realized. The light brush head 3 is connected with the primer equipment through the floating assembly 1, is separated from the heavy body of the primer equipment, the position of the brush head 3 and the vehicle body is relatively stable, and the floating part 12 has a certain pre-pressure under the action of the pressure assembly 4, so that the brushing effect of the brush head 3 is more stable, and the problems of large and small glue width and thick and thin primer liquid are solved.

[0042] In some embodiments, the fixed part 11 and the floating part 12 can have various setting forms, for example, a guide mechanism, a sliding mechanism, a rolling mechanism and the like which can be movably arranged, and the fixed part 11 and the floating part 12 which can be movably arranged are ensured, and fall within the protection scope of the present application.

[0043] Specifically, the fixed part 11 of the embodiment includes a key mother 111 and a mounting block 112 fixedly arranged on the key mother 111, please refer to Figure 2 The key mother 111 can be mounted on the mounting block 112 through hole shaft cooperation and flat key fixation, and the two are fixedly connected. The floating part 12 includes a spline shaft 121 movably arranged in the key mother 111, and the spline shaft 121 and the key mother 111 form a ball spline structure. The specific structure of the ball spline is not described here, and can refer to the prior art.

[0044] One of the characteristics of the ball spline is that the spline shaft 121 and the key mother 111 can slide in the axial direction, which can be realized through the ball structure inside the ball spline. In the embodiment, the key mother 111 is the basis of the fixed part 11, so the spline shaft 121 has the sliding effect in the axial direction, and therefore the spline shaft 121 can be used as a movable part, and the brush head 3 is arranged at one end of the spline shaft 121, so that the brush head 3 is movably arranged.

[0045] A limiting piece 122 is arranged at the other end of the spline shaft 121, and the limiting piece 122 has a clamping ring 123 which is axially clamped with the key mother 111, so as to limit the movement range of the spline shaft 121 in the direction facing the equipment to be brushed. Please refer to Figure 2 The limiting piece 122 can be separately arranged as a part of the spline shaft 121 end, so as to realize the limiting effect, or can be a part of the structure of the spline shaft 121, for example, the clamping ring 123 is arranged at the outer periphery of the spline shaft 121 end, which also has the limiting effect of the limiting piece 122.

[0046] Please refer to Figure 2The pressure assembly 4 further comprises a mounting base 41 arranged on the fixed part 11, and a resilient member arranged on the mounting base 41, and a resilient end of the resilient member is connected with the limiting part 122. The resilient member can be a spring, a small cylinder or the like, and has a certain resilient compression performance. The air inside the small cylinder can be compressed under the action of an external force, and thus the power end of the small cylinder also has a certain resilient compression performance. The resilient member can automatically reset after the external force disappears, so as to provide a resetting elastic force for the floating part 12. When the spline shaft 121 drives the limiting part 122 to compress the resilient member, the spline shaft 121 can move within a certain range of movement, and the amount of movement within the range is the floating amount of the spline shaft 121 or the brush head 3.

[0047] When the vehicle body has a deviation amount or has a curved surface deviation, the resilient force provided by the resilient member can act on the spline shaft 121, so as to drive the brush head 3 to move to compensate for the deviation amount of the vehicle body according to the deviation condition.

[0048] In some embodiments, the mounting base 41 has a hollow cavity 42, please refer to Figure 2 The resilient member can be a spring, and the spring is arranged in the hollow cavity 42. A threaded adjusting pressure rod 43 is arranged at the upper end of the mounting base 41. One end of the adjusting pressure rod 43 extends into the hollow cavity 42, and the other end is located outside the hollow cavity 42. The adjusting pressure rod 43 can be manually rotated, and the position of the adjusting pressure rod 43 in the hollow cavity 42 can be changed after the adjusting pressure rod 43 is rotated.

[0049] The adjusting pressure rod 43 arranged in the hollow cavity 42 is provided with a limiting ring 44. One end of the spring is connected with the limiting ring 44, and the other end is connected with the clamping ring 123. Thus, by adjusting the position of the adjusting pressure rod 43 in the hollow cavity 42, the compression amount of the spring can be changed, the elastic force generated by the spring acts on the limiting part 122, and the precise adjustment of the floating pre-pressure of the floating part 12 can be realized.

[0050] If the resilient member is a small cylinder or other components, the small cylinder can be fixed on the mounting base 41, and the power end of the small cylinder is connected with the limiting part 122. Thus, by the extension and contraction of the power end of the small cylinder, the position of the floating part 12 can be changed, and the precise adjustment of the floating pre-pressure of the floating part 12 can also be realized.

[0051] In addition, a stroke cavity 45 is arranged at one end of the hollow cavity 42 close to the fixed part 11, please refer to Figure 2 The diameter of the stroke cavity 45 is greater than that of the hollow cavity 42, and the clamping ring 123 can extend into the stroke cavity 45, so that the stroke cavity 45 has a certain limiting effect on the clamping ring 123, and the clamping ring 123 can move within the axial range of the stroke cavity 45.

[0052] Please refer to Figure 1The application also comprises the mounting plate 6 and the three-dimensional adjustment piece 5 arranged on the mounting plate 6, the mounting plate 6 is used as a main bearing component, and a set of mounting holes are reserved and integrated on the primer equipment; the fixed part 11 of the floating assembly 1 is fixedly arranged on the three-dimensional adjustment piece 5, the three-dimensional adjustment piece 5 can accurately adjust the position of the floating assembly 1 on the x-axis, y-axis and z-axis through three-dimensional coordinate measurement, so that the position error of the brush head 3 after each disassembly and replacement is constant within ±0.02 mm.

[0053] Specifically, refer to Figure 3 The three-dimensional adjustment piece 5 comprises at least three groups of adjustment blocks 51, wherein the first group of adjustment blocks 51 is fixedly connected with the mounting plate 6, the adjustment pads 52 are arranged between the second group of adjustment blocks 51 and the first group of adjustment blocks 51 and between the third group of adjustment blocks 51 and the second group of adjustment blocks 51 and between the fixed part 11 and the third group of adjustment blocks 51, and the interval between two adjustment blocks is adjusted through the adjustment pads 52 with different thicknesses, so as to realize the position adjustment on the x-axis, y-axis and z-axis.

[0054] Of course, the three-dimensional adjustment piece 5 comprises but is not limited to the above-mentioned manner, which can ensure that the position adjustment on the x-axis, y-axis and z-axis is realized and the position is fixed after the position adjustment, and no more limitation is made here, which falls within the protection scope of the application.

[0055] The application also comprises the brush connecting piece 2, please refer to Figure 1 and Figure 2 The brush connecting piece 2 comprises a liquid inlet connector 21 and a mounting connector 22, on the basis of the above-mentioned embodiment, the liquid inlet connector 21 can be fixed on the floating part 12 of the floating assembly 1 through screwing, that is, fixed on the lower end of the spline shaft 121, the lower end of the liquid inlet connector 21 is connected with the mounting connector 22 through screwing, and the mounting connector 22 is mounted with the brush head 3 through interference fit.

[0056] The liquid inlet connector 21 has a hollow channel 211 inside, and the outer surface of the liquid inlet connector 21 is provided with a liquid inlet 212 in communication with the hollow channel 211; the mounting connector 22 is internally provided with a liquid outlet channel 221 in communication with the hollow channel 211, and the brush head 3 is connected with the liquid outlet channel 221, so that the primer liquid can flow onto the brush head 3.

[0057] In addition, sealing rings are arranged at the connection positions of the mounting connector 22 and the liquid inlet connector 21 and the brush head 3 and the mounting connector 22, the sealing rings are arranged on the outer periphery of the connectors through nesting installation, the sealing rings are deformed through sleeve extrusion, so that the connection positions are sealed, the mechanism is prevented from being contaminated by the primer liquid, and the interference fit can meet the quick replacement of the brush head 3. The brush base is made of non-metallic material, and the mounting hole is slightly smaller than the diameter of the corresponding boss of the mounting connector 22, so that the brush head 3 can be tightly sleeved on the mounting connector and will not fall off.

[0058] Please refer toFigure 2 A buffer cavity 23 is arranged between the brush head 3 and the liquid outlet channel 221, and the primer liquid enters the buffer cavity 23 from the liquid outlet channel 221, and the primer liquid can be fully diffused in the buffer cavity 23, so as to enter the brush head 3 uniformly, and a better brushing effect is achieved.

[0059] Please refer to Figure 2 The mechanism further comprises a liquid supply assembly 7, which comprises a screw glue valve 71 and a pipeline 72 connecting the liquid outlet of the screw glue valve 71 and the liquid inlet 212 of the liquid inlet connector 21. Since the screw glue valve 71 is relatively heavy, the screw glue valve 71 can be fixed on the mounting plate 6, so that the screw glue valve 71 is separated from the floating assembly 1, and the floating assembly 1 is more easily floated.

[0060] In addition, for the brush head 3, different styles of brushes can be used, and no more limitation is made herein; and the liquid supply assembly 7 can also be a gear pump, a peristaltic pump or other primer liquid supply equipment, which all fall within the protection scope of the present application.

[0061] Since the stator and rotor in the screw glue valve 71 are consumable parts, the screw glue valve 71 is disassembled every time it is replaced, which causes the robot trajectory to be changed. In the present application, the screw valve is only used as a liquid supply part and does not participate in positioning and floating, so that the disassembly process does not affect the glue type trajectory, improves the maintenance efficiency, and makes the primer automatic equipment more easily accepted.

[0062] Considering that the brush connector 2 itself has a certain weight, the gravity of the brush connector 2 should also be considered when considering the floating pre-pressure; on this basis, the sum of the elastic force generated by the spring and the gravity of the brush connector 2 should be within the rebounding force range of the brush head 3, so as to ensure that the floating part 12 can float within the preset activity range.

[0063] In the implementation process, the corresponding brush head 3 corresponding to the brushing process is selected, for example, the brush diameter of the brush head 3 is 12 mm, the length is 8 mm, and the effective pre-pressing depth is 4.5±0.5 mm; through experimental determination, the pre-pressing force of the corresponding brush head 3 is 2N to 2.8N; in the present embodiment, the weight of the brush connector 2 of the present equipment is 170g, about 1.7N, the spring elastic force is adjusted to 0.3~0.7N, and the floating stroke of the floating part 12 is 5mm, which ensures that the brush pre-pressing force is ensured to be 2~2.5N while the bodywork sheet metal deviation is compatible. It is verified through production that, after using the present application, the brushing effect is stable, and the problems such as large and small glue width, thick and thin primer liquid, etc. that are difficult to solve in the past are solved.

[0064] It should be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any such actual relationship or order between the entities.

[0065] The principles and implementations of the present application are described in detail with specific examples in this paper, and the above examples are only used to help understand the method and its core idea of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A floating primer coating mechanism, characterized in that, The floating component (1) includes a fixed part (11) fixedly connected to the primer coating equipment and a floating part (12) movably disposed relative to the fixed part (11). The floating part (12) moves in a direction facing or away from the equipment to be coated, and the floating part (12) is provided with a brush head (3) for coating. It also includes a pressure component (4), which includes a spring member connected to the floating part (12). Within a preset range of motion of the floating part (12), the floating part (12) squeezes the spring member so that the spring member generates a spring force that overcomes the squeezing of the floating part (12).

2. The floating primer coating mechanism according to claim 1, characterized in that, The fixed part (11) includes a key nut (111) and a mounting block (112) fixed on the key nut (111). The floating part (12) includes a spline shaft (121) movably disposed inside the key nut (111) and forming a ball spline with the key nut (111). The spline shaft (121) moves axially relative to the key nut (111), and one end of the spline shaft (121) is connected to the brush head (3).

3. The floating primer coating mechanism according to claim 2, characterized in that, The other end of the spline shaft (121) is provided with a limiting member (122), and the outer periphery of the limiting member (122) is provided with a retaining ring (123) that is axially engaged with the key nut (111) to limit the range of motion of the spline shaft (121) in the direction facing the coating equipment.

4. The floating primer coating mechanism according to claim 3, characterized in that, The pressure assembly (4) further includes a mounting base (41) disposed on the fixing part (11), the spring-loaded member is disposed on the mounting base (41), and the spring-loaded end of the spring-loaded member is connected to the limiting member (122).

5. The floating primer coating mechanism according to claim 4, characterized in that, The mounting base (41) has a hollow cavity (42), the spring is a spring, the spring is located in the hollow cavity (42), and an adjusting rod (43) is threadedly connected to the mounting base (41). One end of the adjusting rod (43) extends into the hollow cavity (42), and a limiting ring (44) is provided on the outer periphery of the adjusting rod (43) extending into the hollow cavity (42). One end of the spring is connected to the limiting ring (44), and the other end is connected to the retaining ring (123). The adjusting rod (43) is rotated to adjust the compression of the spring.

6. The floating primer coating mechanism according to claim 5, characterized in that, The hollow cavity (42) has a travel cavity (45) at one end near the fixed part (11). The diameter of the travel cavity (45) is larger than the diameter of the hollow cavity (42). The retaining ring (123) extends into the travel cavity (45) and moves within the axial range of the travel cavity (45).

7. The floating primer coating mechanism according to any one of claims 1-6, characterized in that, It also includes a mounting plate (6) and a three-dimensional adjustment component (5) disposed on the mounting plate (6). The mounting plate (6) is fixedly connected to the primer coating equipment. The fixing part (11) is fixedly disposed on the three-dimensional adjustment component (5). The three-dimensional adjustment component (5) is used to adjust the position of the floating component (1) on the x-axis, y-axis and z-axis.

8. The floating primer coating mechanism according to claim 7, characterized in that, The three-dimensional adjustment component (5) includes at least three sets of adjustment blocks (51), wherein the first set of adjustment blocks (51) is fixedly connected to the mounting plate (6), and adjustment shims (52) are provided between the second set of adjustment blocks (51) and the first set of adjustment blocks (51), between the third set of adjustment blocks (51) and the second set of adjustment blocks (51), and between the fixing part (11) and the third set of adjustment blocks (51). The thickness of the adjustment shims (52) is adjusted to change the position of the floating component (1) on the x-axis, y-axis, and z-axis.

9. The floating primer coating mechanism according to claim 7, characterized in that, It also includes a brush connector (2), which comprises: The liquid inlet connector (21) is connected to the floating part (12) at one end. The liquid inlet connector (21) has a hollow channel (211) inside and a liquid inlet (212) communicating with the hollow channel (211) on the outer surface of the liquid inlet connector (21). The mounting connector (22) is sealed at the other end of the liquid inlet connector (21). The mounting connector (22) has an outlet channel (221) that communicates with the hollow channel (211). The end of the mounting connector (22) is sealed with the brush head (3), which is connected to the outlet channel (221).

10. The floating primer coating mechanism according to claim 9, characterized in that, The brush head (3) is press-fitted to the mounting connector (22), and a buffer chamber (23) is provided between the brush head (3) and the liquid outlet channel (221). The liquid enters the brush head (3) after passing through the buffer chamber (23).

11. The floating primer coating mechanism according to claim 9, characterized in that, It also includes a liquid supply assembly (7), which includes a screw dispensing valve (71) and a pipeline (72) connecting the outlet of the screw dispensing valve (71) and the inlet (212). The screw dispensing valve (71) is fixed on the mounting plate (6).

12. A primer coating apparatus, characterized in that, Includes the floating primer application mechanism as described in any one of claims 1-11.

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