Coating device

Abstract

The utility model relates to the technical field of construction of coating devices, and discloses a coating device which comprises a coating mechanism provided with a coating part, and a coating mechanism provided with a coating part, the material suction barrel is connected with the coating mechanism and supplies materials to the coating mechanism; the piston mechanism is arranged in the material suction barrel and comprises a piston rod and a piston matched with the piston of the material suction barrel in the axial direction of the material suction barrel; the reset elastic piece is arranged between the piston mechanism and the material suction barrel and can drive the piston mechanism to move towards the coating mechanism; the inner circumferential wall of the material suction barrel and the piston are provided with stop structures for limiting the piston to move. The coating device can automatically and uniformly output the coating and accurately control the suction amount and the output amount of the coating, so that convenient construction is realized, and the waste of the coating is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of coating device construction, and specifically relates to a coating device. Background Art

[0002] The existing roller coating device that can carry a certain amount of paint has a relatively simple structure. It consists of a roller and a paint bottle. A certain amount of paint can be stored in the bottle. It is a single-use device and cannot be recycled and reused multiple times. Since the bottle is closed, the output of the material can only be done by hand squeezing, which has a great impact on the construction workers. Squeezing the bottle is extremely laborious and inconvenient for construction. When the paint is discharged in large quantities, a certain amount of paint will overflow from the discharge part of the roller, causing pollution to the device and splashing on the surface of the construction workers' bodies. When there is less paint left, since the bottle is soft, as the paint is squeezed out, the bottle becomes softer and softer. With a little force, the bottle will deform, further increasing the difficulty of construction. Utility Model Content

[0003] The purpose of this application is to provide a coating device to achieve convenient construction and reduce paint waste.

[0004] In order to achieve the above object, the present application provides a coating device, which comprises:

[0005] A coating mechanism, wherein the coating mechanism is provided with a coating member;

[0006] A suction cylinder, the suction cylinder is connected to the coating mechanism and supplies material to the coating mechanism;

[0007] A piston mechanism, which is disposed in the suction cylinder and comprises a piston rod and a piston cooperating with the suction cylinder piston along the axial direction of the suction cylinder; and

[0008] A reset elastic member, which is disposed between the piston mechanism and the suction cylinder and can drive the piston mechanism to move toward the coating mechanism;

[0009] Wherein, a stop structure for limiting the piston movement is provided on the inner circumferential wall of the suction cylinder and the piston.

[0010] In some embodiments, the stop structure may include:

[0011] A limiting groove, wherein the limiting groove is provided on one of the inner peripheral wall of the suction cylinder and the piston; and

[0012] An elastic limiting component is arranged on the inner circumferential wall of the suction cylinder and the other of the piston and can cooperate with the limiting groove in a limiting manner.

[0013] In some specific embodiments, the limit groove can be formed on the inner circumferential wall of the suction barrel, and the elastic limit component includes an elastic connecting piece and a limit member that can be clamped in the limit groove, one end of the limit member is connected to the piston through the elastic connecting piece, and the other end is pressed against the inner circumferential wall of the suction barrel.

[0014] In some specific embodiments, the piston may include a first piston part and a second piston part which are arranged at intervals along the axial direction of the suction cylinder and respectively cooperate with the suction cylinder piston, and the elastic limiting component is arranged on the piston and located between the first piston part and the second piston part.

[0015] In some specific embodiments, a plurality of the limiting grooves are provided, and the plurality of limiting grooves are arranged in a plurality of rows at intervals along the circumference of the suction cylinder, and are arranged in a plurality of rows at intervals along the axial direction of the suction cylinder.

[0016] In some specific embodiments, the axial front end of the suction barrel is provided with an inlet and outlet, the axial rear end of the suction barrel is provided with a bottom seal, the bottom seal is provided with a bottom seal limiting hole, the piston rod comprises a front rod section and a rear rod section arranged along the axial direction, the front rod section is connected to the piston, the rear rod section can extend from the bottom seal limiting hole and the outer peripheral wall is axially provided with a limiting portion that cooperates with the circumferential limiting hole of the bottom seal, when the front rod section extends into the bottom seal limiting hole and rotates circumferentially, the limiting portion cooperates with the axial limiting hole of the bottom seal.

[0017] In some specific embodiments, the resetting elastic member is a resetting spring and abuts between the piston and the bottom cover; or,

[0018] The resetting elastic member is an elastic wire, one end of which is fixed to the axial front end of the suction cylinder, and the other end of which is fixed to the axial rear end of the piston rod.

[0019] In some specific embodiments, the coating mechanism may also include a roller support detachably connected to the suction cylinder, the coating member is arranged at the front end of the roller support, the rear end of the roller support is provided with a storage chamber and a feed port and a discharge port connected to the storage chamber, the discharge port is provided with multiple ports and arranged toward the coating member, and the feed port is connected to the feed and discharge ports of the suction cylinder.

[0020] In some specific embodiments, the coating member may be a roller and detachably connected to the roller support;

[0021] And / or, the feed port may be provided with a one-way opening valve.

[0022] In some specific embodiments, the roller support may further include splash plates disposed on both radial sides of the coating member.

[0023] Through the above technical solution, the coating device realizes automatic discharging through the piston mechanism and the reset elastic member. The construction personnel only need to release the stop structure to conveniently discharge the material, which greatly improves the construction efficiency. The reset elastic member can slowly push the piston rod to achieve uniform output of the paint, effectively avoiding the paint from splashing during discharging, and reducing the waste and pollution of the paint. In addition, since the inner wall of the suction cylinder and the piston are provided with a stop structure that limits the piston from moving, the construction personnel can suspend the automatic discharging and accurately control the amount of paint absorbed and output, further reducing waste and maintaining the freshness of the paint.

[0024] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0026] Figure 1 A schematic structural diagram of a coating device according to a specific embodiment of the present invention is shown;

[0027] Figure 2 Shows Figure 1 An exploded view of the coating device in FIG.

[0028] Figure 3 Shows Figure 1 A side view of a coating device in FIG.

[0029] Figure 4 Shows Figure 3 A cross-sectional view at position AA in FIG.

[0030] Figure 5 Shows Figure 1 A schematic diagram of the structure of the roller support in FIG.

[0031] Figure 6 Shows Figure 5 A cross-sectional view of the BB position in FIG.

[0032] Figure 7 Shows Figure 1 A partial schematic diagram of the coating device in the embodiment when the front rod section of the piston rod is located axially inside the bottom sealing limiting hole;

[0033] Figure 8 Shows Figure 1A partial schematic diagram of the coating device in the embodiment of the present invention when the front rod section of the piston rod extends into the bottom limit hole and rotates in the circumferential direction.

[0034] Description of Reference Numerals

[0035] 1 Coating part 2 Suction tube

[0036] 21 Limiting slot 22 Inlet and outlet

[0037] 23 bottom cover 231 bottom cover limit hole

[0038] 31 piston rod 311 front rod section

[0039] 312 rear rod section 3121 limiter

[0040] 32 Piston 321 First piston part

[0041] 322 second piston portion 33 elastic connecting member

[0042] 34 limiter 35 reset elastic member

[0043] 4 Roller support 41 Storage chamber

[0044] 42 Feed port 421 Valve

[0045] 43 Discharge port 44 Splash plate

[0046] 45 buffer plate DETAILED DESCRIPTION

[0047] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0048] The present application provides a coating device, such as Figure 1 and Figure 2As shown, the coating device includes a coating mechanism, a suction barrel 2, a reset elastic member and a piston mechanism. The suction barrel 2 is connected to the coating mechanism and feeds the coating mechanism. The coating mechanism is provided with a coating member 1, and the coating member 1 is used for coating. The piston mechanism is arranged in the suction barrel 2 and includes a piston rod 31 and a piston 32. The piston rod 31 is connected to the piston 32, and the piston 32 cooperates with the piston of the suction barrel 2 along the axial direction of the suction barrel 2. The piston rod 31 can push or pull the piston 32 to perform piston movement along the axial direction of the suction barrel 2, so that the paint can be sucked or discharged by adjusting the pressure change in the suction barrel 2. The piston structure is used for suction and discharge, which makes the construction more convenient, saves time and labor, and can also avoid the situation where the paint splashes and splashes on the body surface of the construction personnel. The construction is cleaner and more sanitary, and the construction difficulty is reduced. In addition, the piston rod 31 in the suction barrel 2 can squeeze out most of the material in the barrel body, reduce waste, and is also more convenient to clean, and only the barrel mouth needs to be cleaned.

[0049] Among them, the reset elastic member 35 is arranged between the piston mechanism and the suction barrel 2 and can drive the piston mechanism to move slowly toward the coating mechanism, so that the automatic uniform discharge function can be realized. In addition, a stop structure is provided on the inner circumferential wall of the suction barrel 2 and the piston 32, and the stop structure has a locked state and an unlocked state. The stop structure can form a limit fit between the piston 32 and the inner circumferential wall of the suction barrel 2 in the locked state to limit the piston 32 from piston movement, and release the limit fit between the piston 32 and the inner circumferential wall of the suction barrel 2 in the unlocked state. That is, when the stop structure is in the locked state, the automatic discharge function can be suspended, and when the stop structure is in the unlocked state, the coating device can automatically discharge the material under the reset action of the reset elastic member 35. In addition, the stop structure is arranged along the axial direction of the suction barrel 2, and the axial arrangement position of the stop structure in the suction barrel 2 can be determined according to the demand for the amount of use. In this way, the output of the coating can be accurately controlled, waste can be reduced, the construction speed can be increased, and the freshness of the coating can be maintained.

[0050] In some specific embodiments, the stop structure includes a limit groove 21 and an elastic limit component, and the elastic limit component can cooperate with the limit groove 21 to limit the piston movement of the piston 32. The limit groove 21 can be set on the inner circumferential wall of the suction cylinder 2, and the elastic limit component is set on the piston 32; or the limit groove 21 can be set on the piston 32, and the elastic limit component is set on the inner circumferential wall of the suction cylinder 2.

[0051] Those skilled in the art can understand that the stopping structure of the present application is not limited to the structure of the above-mentioned limit groove 21 and the elastic limit component. For example, a radial opening can also be set on the peripheral wall of the suction cylinder, and the locking screw can be threadedly connected to the radial opening and pressed against the piston mechanism to limit the piston 32 from performing piston movement. These structural forms should also fall within the scope of protection of the present application.

[0052] In some specific embodiments, Figure 3 and Figure 4 As shown, the limiting groove 21 is formed on the inner circumferential wall of the suction barrel 2, and a plurality of limiting grooves 21 are provided. The suction barrel 2 may be cylindrical, and a plurality of limiting grooves 21 are arranged in a plurality of rows along the circumferential direction of the suction barrel 2, and are arranged in a plurality of rows along the axial direction of the suction barrel 2. The axial arrangement position of the limiting groove 21 may be arranged according to the demand for usage, such as 25%, 50%, 75% of the total amount of the suction barrel, or 20%, 40%, 60%, 80%, etc. For the convenience of construction, a lateral branch handle may also be provided on the outer circumferential wall of the suction barrel 2.

[0053] Optionally, the elastic limiting component may include an elastic connector 33 and a limiting member 34, and the limiting member 34 can be stuck in the limiting groove 21. One end of the limiting member 34 is connected to the piston 32 through the elastic connector 33, and the other end is pressed against the inner circumferential wall of the suction cylinder 2. When the piston 32 performs piston motion and moves to the axial position where the limiting groove 21 is located, the limiting member 34 is stuck in the limiting groove 21 under the elastic force of the elastic connector 33. At this time, the piston rod 31 will not move in a natural state. If the piston rod 31 needs to continue to move and an axial force is applied to the piston rod 31 at the same time, the limiting member 34 will cancel the limit and move in the direction of the force. Alternatively, the limiting groove 21 can be set to have a certain elasticity. At this time, if the piston rod 31 needs to continue to move, a force can be applied to the outer circumferential wall of the suction cylinder outside the limiting groove 21 at the same time to squeeze the limiting groove 21 and the limiting member 34 in the limiting groove 21 inward. Figure 4 As shown, the limiting groove 21 is a hemispherical groove arranged on the inner wall of the suction tube 2, the limiting member 34 is a limiting bead, and the elastic connecting member 33 is a limiting spring or an elastic rubber member, etc. Of course, the elastic limiting member is not limited to the above structure, and can also be an integrally formed elastic rubber member, etc.

[0054] In some specific embodiments, Figure 4 As shown, the piston 32 may include a first piston portion 321 and a second piston portion 322 which are arranged at intervals along the axial direction of the suction barrel 2 and respectively cooperate with the piston of the suction barrel 2, and an elastic limiting component is arranged on the piston 32 and located between the first piston portion 321 and the second piston portion 322. In this way, the piston cooperation between the piston structure and the inner circumferential wall of the suction barrel 2 can be ensured to be more reliable, avoiding the situation of material leakage.

[0055] Furthermore, if Figure 4 , Figure 7 and Figure 8As shown, the axial front end of the suction barrel 2 is provided with a material inlet and outlet port 22, the axial rear end of the suction barrel 2 is provided with a bottom seal 23, the bottom seal 23 is provided with a bottom seal limiting hole 231, and the rear end of the piston rod 31 extends backward from the bottom seal limiting hole 231. The piston rod 31 includes a front rod segment 311 and a rear rod segment 312 arranged in the axial direction, the front rod segment 311 is connected to the piston 32, the rear rod segment 312 can extend from the bottom seal limiting hole 231, and the outer peripheral wall of the rear rod segment 312 is axially provided with a limiting portion 3121 that cooperates with the bottom seal limiting hole 231 in a circumferential direction. A plurality of limiting portions 3121 can be arranged at intervals along the circumference of the rear rod segment 312, and the limiting portions 3121 extend along the axial direction of the rear rod segment 312, and the shape of the bottom seal limiting hole 231 can match the cross-sectional shape of the rear rod segment 312, so that the rear rod segment 312 and the bottom seal limiting hole 231 can achieve circumferential limiting cooperation. The maximum outer diameter of the cross section of the front rod segment 311 is set to be less than or equal to the minimum inner diameter of the bottom sealing limit hole 231, so that when the front rod segment 311 extends into the bottom sealing limit hole 231, the front rod segment 311 can rotate circumferentially in the bottom sealing limit hole 231. When the front rod segment 311 extends into the bottom sealing limit hole 231 and rotates circumferentially, the axial front end of the limiting portion 3121 can abut against the hole circumference of the bottom sealing limit hole 231, thereby achieving axial limiting cooperation with the hole circumference of the bottom sealing limit hole 231, and limiting the forward movement of the piston mechanism.

[0056] Optionally, the resetting elastic member 35 may be a resetting spring or an elastic rubber member, and abuts between the piston 32 and the bottom cover 23. Figure 4 As shown, the reset elastic member 35 is a reset spring sleeved on the piston rod 31, the front end of the reset elastic member 35 presses on the rear end of the piston 32, and the rear end of the reset elastic member 35 presses on the bottom cover 23. The piston rod 31 and the bottom cover limit hole 231 can form a limit structure. When the suction tube 2 is full, the piston 32 is in its limit position, and the reset elastic member 35 is in the maximum pressure state. At this time, the piston rod 31 is rotated to start the limit structure, and the piston rod 31 is limited and clamped on the bottom cover 23 to prevent the piston rod 31 from pushing out the paint under the action of the reset elastic member 35. After the coating mechanism and the suction tube 2 are tightly connected, the limit part 3121 of the piston rod 31 is rotated back to the bottom cover limit hole 231 to restore the limit structure. At this time, the material can be slowly pushed out by the pressure of the reset elastic member 35 to achieve the state of automatic discharging. At the same time, the paint will not remain on the cylinder wall under the action of the piston 32, which can achieve the function of saving materials to a certain extent.

[0057] Those skilled in the art can understand that the reset structure of the piston mechanism of the present application is not limited to the structure of the above-mentioned reset elastic member 35. The reset elastic member 35 can also be, for example, an elastic wire, one end of the elastic wire is fixed to the axial front end of the suction cylinder 2, and the other end is fixed to the axial rear end of the piston rod 31. These structural forms should also fall within the protection scope of the present application.

[0058] In some specific embodiments, the coating mechanism may further include a roller support 4 detachably connected to the suction barrel 2, the coating member 1 is arranged at the front end of the roller support 4, and the rear end of the roller support 4 is provided with a storage chamber 41, a feed port 42 and a discharge port 43, the feed port 42 and the discharge port 43 are respectively connected to the storage chamber 41, and the feed port 42 is connected to the feed port 22 of the suction barrel 2. The feed port 42 is located at the rear end of the storage chamber 41 and is used to feed the storage chamber 41, and the discharge port 43 is located at the front end of the storage chamber 41 and is used to output the paint in the storage chamber 41.

[0059] like Figure 2 , Figure 5 as well as Figure 6 As shown, the storage chamber 41 is a space for temporarily storing the paint transported by the suction cylinder, and the feed port 42 is located at the rear end of the storage chamber 41. The peripheral wall of the inlet and outlet port 22 of the suction cylinder 2 is threadedly connected to the peripheral wall of the feed port 42 of the roller support 4. A buffer plate 45 is provided at the front end of the storage chamber 41, and a plurality of discharge ports 43 are evenly distributed on the buffer plate 45 and arranged toward the coating member 1 to ensure that the paint can be discharged at a uniform speed. The buffer plate 45 is rectangular and includes a pair of long sides and a pair of short sides. The pair of short sides extend to the front end perpendicularly to the length direction to form two opposite coating member mounting plates, and the pair of long sides extend to the front end perpendicularly to the length direction to form two opposite splash plates 44. The coating member 1 is a roller and is detachably connected to the coating member mounting plate. The coating member 1 can be replaced at any time and can also be reused. Two splash plates 44 are arranged on both sides of the radial direction of the coating member 1 to prevent the paint from splashing from the coating member 1.

[0060] The suction barrel 2 can be made of a relatively hard material, and both ends are provided with connecting threads. The connecting threads at the front inlet and outlet 22 are used to connect to the feed inlet 42 of the roller support 4, and prevent the paint from leaking from the connection position. The connecting threads provided at the rear end of the suction barrel 2 are used to connect to the bottom cover 23, ensuring that the suction barrel 2 is in a relatively sealed environment.

[0061] Optionally, the feed port 42 is provided with a one-way opening valve 421. The valve 421 is a one-way check structure similar to a heart valve structure, which can utilize the heart valve principle to prevent material backflow, avoid paint overflow and pollution, and effectively reduce paint waste. Figure 6 As shown, the valve 421 is a cross valve.

[0062] Specifically, the working process of the coating device of the present application is as follows: first, the inlet and outlet 22 of the suction barrel 2 is placed into the paint, and the piston rod 31 is pulled to suck the paint into the suction barrel 2. As the piston rod 31 gradually moves backward, the paint gradually enters the suction barrel 2 under the pressure. After the suction barrel 2 is full, the piston rod 31 is twisted to start the limit structure to prevent the piston rod 31 from pushing out the paint under the action of the spring. Then, the coating member 1 is connected to the roller support 4, and the roller support 4 is tightly connected to the suction barrel 2 through the connecting thread to prevent leakage. Then the limit structure is restored, the suction barrel 2 is held by hand, and the paint is rolled for construction. At this time, the material can be slowly pushed out by the reset pressure of the spring. Among them, when the limit member 34 in the piston rod 31 runs to the limit groove 21, the limit member 34 pops out under the action of the elastic connecting member 33 and is located in the limit groove 21. At this time, the piston rod 31 will not move under the action of the reset elastic member 35. If the piston rod 31 needs to continue to move, the limiting groove 21 can be pressed to squeeze out the limiting member 34. At this time, the piston rod 31 will continue to move forward under the action of the resetting elastic member 35 until it reaches the next limiting groove 21 or the paint is completely discharged.

[0063] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood 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 of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A coating device, characterized in that: include: A coating mechanism, wherein the coating mechanism is provided with a coating member (1); A suction cylinder (2), the suction cylinder (2) is connected to the coating mechanism and supplies material to the coating mechanism; A piston mechanism, the piston mechanism being arranged in the suction cylinder (2) and comprising a piston rod (31) and a piston (32) cooperating with the piston of the suction cylinder (2) along the axial direction of the suction cylinder (2); and a reset elastic member (35), the reset elastic member (35) being arranged between the piston mechanism and the suction cylinder (2) and being capable of driving the piston mechanism to move toward the coating mechanism; Wherein, a stop structure for limiting the piston (32) from performing piston movement is provided on the inner peripheral wall of the suction cylinder (2) and the piston (32).

2. The coating device according to claim 1, characterized in that: The stop structure comprises: a limiting groove (21), wherein the limiting groove (21) is arranged on one of the inner peripheral wall of the suction cylinder (2) and the piston (32); and An elastic limiting component is arranged on the other of the inner peripheral wall of the suction cylinder (2) and the piston (32) and can cooperate with the limiting groove (21) in a limiting manner.

3. The coating device according to claim 2, characterized in that: The limiting groove (21) is formed on the inner circumferential wall of the suction barrel (2), and the elastic limiting component comprises an elastic connecting piece (33) and a limiting piece (34) that can be clamped in the limiting groove (21), one end of the limiting piece (34) is connected to the piston (32) through the elastic connecting piece (33), and the other end is pressed against the inner circumferential wall of the suction barrel (2).

4. The coating device according to claim 2, characterized in that: The piston (32) comprises a first piston part (321) and a second piston part (322) which are arranged at intervals along the axial direction of the suction cylinder (2) and respectively cooperate with the piston of the suction cylinder (2); the elastic limiting component is arranged on the piston (32) and is located between the first piston part (321) and the second piston part (322).

5. The coating device according to claim 2, characterized in that: A plurality of the limiting grooves (21) are provided, and the plurality of limiting grooves (21) are arranged in a plurality of rows at intervals along the circumference of the suction barrel (2), and are arranged in a plurality of rows at intervals along the axial direction of the suction barrel (2).

6. The coating device according to claim 1, characterized in that: The axial front end of the suction barrel (2) is provided with an inlet and outlet port (22), the axial rear end of the suction barrel (2) is provided with a bottom seal (23), the bottom seal (23) is provided with a bottom seal limiting hole (231), the piston rod (31) comprises a front rod section (311) and a rear rod section (312) arranged along the axial direction, the front rod section (311) is connected to the piston (32), the rear rod section (312) can extend from the bottom seal limiting hole (231) and the outer peripheral wall is axially provided with a limiting portion (3121) which cooperates with the bottom seal limiting hole (231) in a circumferential direction, when the front rod section (311) extends into the bottom seal limiting hole (231) and rotates in a circumferential direction, the limiting portion (3121) cooperates with the bottom seal limiting hole (231) in an axial direction.

7. The coating device according to claim 6, characterized in that: The resetting elastic member (35) is a resetting spring and abuts between the piston (32) and the bottom cover (23); or, The resetting elastic member (35) is an elastic wire, one end of which is fixed to the axial front end of the suction cylinder (2), and the other end of which is fixed to the axial rear end of the piston rod (31).

8. The coating device according to claim 1, characterized in that: The coating mechanism further comprises a roller support (4) detachably connected to the suction cylinder (2); the coating member (1) is arranged at the front end of the roller support (4); a storage chamber (41) and a feed port (42) and a discharge port (43) connected to the storage chamber (41) are arranged at the rear end of the roller support (4); a plurality of discharge ports (43) are provided and arranged toward the coating member (1); and the feed port (42) is connected to the feed and discharge ports (22) of the suction cylinder (2).

9. The coating device according to claim 8, characterized in that: The coating member (1) is a roller and is detachably connected to the roller support (4); And / or, the feed port (42) is provided with a one-way opening valve (421).

10. The coating device according to claim 8, characterized in that: The roller support (4) also includes splash plates (44) arranged on both radial sides of the coating member (1).

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