Cover Structure of the Liquid Reservoir

Abstract

Provide a cover structure for a liquid storage container that avoids paint from accumulating or solidifying on the outer wall of the connection port. 【Solution means】The cover structure of the liquid storage container includes a cover 1, a connection port 2 provided at the upper part of the cover, and a position limiting member 3 provided on the side wall of the connection port. When the rotary connection part provided on the connection member of the joint is screwed under the position limiting member, it is configured to limit the movement of the cover of the joint in the axial direction, and a penetration flow path 5 provided in the position limiting member, which is a penetration flow path for the paint adhering to the side wall of the connection port to pass through the position limiting member through the penetration flow path. With this cover structure, problems such as difficulty in attaching the liquid storage container due to paint assimilation and falling of fragments onto the spray gun can be solved.

Description

Technical Field

[0001] This application claims priority based on Chinese Patent Application No. 2025201818853, titled "Cover Structure of Liquid Reservoir", filed on February 5, 2025, and all of its contents are incorporated herein by reference. This application belongs to the technical field of spray devices, and particularly relates to the cover structure of a liquid reservoir.

Background Art

[0002] A liquid reservoir is generally a spray cup for storing paint, which is connected to a spray gun during use to eject the internal paint. Chinese Patent Application CN201921120639.8 discloses a cap for a reservoir, in which a locking protrusion is formed to protrude at the spray outlet of the cap body, and the lateral stopper arm of the locking protrusion provides a stopper surface to limit the axial displacement of the nut attached to the spray gun with respect to the cap.

[0003] During spray work, since it is necessary to switch the paint, the liquid reservoir (and the cap) is removed from the spray gun. The removed liquid reservoir is placed with the spray outlet facing upward, but the paint adhering to the spray outlet flows downward along the outer wall of the spray outlet and is blocked by the locking protrusion, so that it solidifies on the outer wall of the spray outlet above the locking protrusion. When this liquid reservoir is reinstalled on the spray gun, the outer diameter of the spray outlet part becomes larger due to the solidified paint, making it difficult to insert into the spray gun. If the spray outlet is forcibly inserted into the spray gun, the solidified paint will peel off in particles under the action of external force and enter the spray gun, causing clogging. Spray guns are expensive, and once the paint particles clogging the spray gun cannot be removed, the spray gun will be completely discarded, resulting in huge economic losses. Even if the paint particles can be removed, it is not only difficult to remove them, but the spray work will be interrupted during the removal operation, prolonging the construction period.

Summary of the Invention

[0004] In view of the problems existing in the prior art, the present application provides a cover structure for a liquid storage device, which can effectively solve the problem that paint solidifies above the locking protrusion.

[0005] The cover structure of the liquid storage device includes a cover, a connection port provided on the upper part of the cover, a position limiting member provided on the side wall of the connection port, which is configured to limit the axial movement of the cover of the joint when a rotary connection part provided on the connection member of the joint is screwed under the position limiting member. a penetration flow path opened in the position limiting member, which is a penetration flow path for the paint adhering to the side wall of the connection port to pass through the position limiting member through the penetration flow path. and includes the above.

[0006] In the present application, by providing a penetration flow path in the position limiting member through which the paint can pass, when the liquid storage device is placed on the table with the connection port facing upward, it is avoided that the paint stays or solidifies on the outer wall of the connection port above the position limiting member. Furthermore, the problems of difficulty in attaching the liquid storage device and the falling of fragments onto the spray gun caused thereby are solved.

[0007] In one embodiment, the position limiting member has a protrusion and is configured to be lockable to the connection member of the joint so as to limit the rotation of the joint with respect to the cover structure. By limiting the rotation of the joint by the protrusion, it is avoided that the joint rotates too much and detaches from the connection and fixing area below the position limiting member.

[0008] In one embodiment, the upper surface of the position limiting member is located on a plane perpendicular to the axial direction of the cover, the connecting member is provided on the end face of the joint, and when the upper surface of the position limiting member is in close contact with the end face of the joint, the rotary connecting portion is aligned with the space below the position limiting member. By engaging the upper surfaces of the position limiting member and the joint end face that are aligned, axial mounting position limitation of the liquid storage device and the spray gun is realized, enabling the rotary connecting portion to be quickly aligned with and screwed into the connection and fixing area, ensuring smooth connection and mounting.

[0009] In one embodiment, the lower surface of the position limiting member has a guide surface for sliding contact with the rotary connecting portion, and the guide surface is provided with a downward inclination. By providing an inclined surface on the lower side of the position limiting member, the screwing of the rotary connecting portion can be guided, and a downward pressure can be applied to the rotary connecting portion by the position limiting member, enhancing the firmness of the connection between the cover structure and the joint.

[0010] In one embodiment, the connecting member has a boss, the rotary connecting portion is provided on the boss, and the outer surface of the position limiting member is in interference fit and close contact with the inner surface of the boss. By making the position limiting member and the connecting member in close contact in the radial direction, the firmness of the connection between the cover structure and the joint can be enhanced.

[0011] In one embodiment, the position limiting member includes at least two position limiting posts, and the penetration flow path is located between two adjacent position limiting posts. The position limitation of the rotary connecting portion of the joint and the formation of the penetration flow path can be realized by a plurality of position limiting posts provided at intervals, with a simple structure and easy manufacturing and processing.

[0012] In one embodiment, the position limiting posts are divided into stopper posts and guide posts. The connecting member has a boss, one side of the boss is connected to the end face of the joint, and the other side is connected to the rotary connecting portion. When the stopper post abuts against the end face of the boss and / or the end face of the rotary connecting portion, the rotation of the joint with respect to the cover structure is restricted.

[0013] According to the present technical solution, by using one position limiting post as a stopper post, it is possible to realize the position limitation of screwing by the rotary connection part.

[0014] In one embodiment, the stopper post protrudes with respect to the guide post in the radial direction and / or the axial direction of the cover. By using a position limiting post that protrudes more in the axial direction or the radial direction of the cover as the stopper post, the installation of the position limiting structure becomes easier.

[0015] In one embodiment, the lower surface of the position limiting member has a guide surface for sliding contact with the rotary connection part. The guide surface is provided to be inclined downward, and the guide surface is constituted by at least two guide posts arranged continuously. By forming the guide surface by the continuously arranged guide posts, not only the tightening after the rotary connection part is screwed in is realized, but also the feedback by the stepwise tightening feel in the process of screwing in the rotary connection part is provided. Thereby, when the user attaches the liquid storage device to the joint of the spray gun, it is ensured that the attachment is sufficient and firm only by the feel feedback.

[0016] In one embodiment, the lower surface of the guide post is an arc surface, a curved surface or a spherical surface. By making the surface of the guide post a smooth surface, when the guide post constitutes the guide surface, it is ensured that the rotary connection part can smoothly pass through the plurality of guide posts and reach the completely screwed-in position without being caught by the guide post.

[0017] In one embodiment, the stopper post is located at the central part or one end of the position limiting member. According to the present technical solution, the rotary connection part may be screwed in from one side or both directions. The flexibility of connection and attachment is improved.

[0018] In one embodiment, when the stopper post is located at one end of the position limiting member, a cut surface parallel to the axial direction of the cover is provided on the side wall of the stopper post on the side away from the guide post. According to the present technical solution, in the case of the stopper post at one end, the rotary connection part can only be screwed in from one side. Due to the cut surface of the stopper post, when the rotary connection part abuts against it from the reverse direction, the rotary connection part can be smoothly pulled out from the cover structure.

[0019] In one embodiment, the cross-section of each position limiting post is circular, elliptical or triangular. According to the present technical solution, not only is it easy to form the position limiting post, but also a larger opening can be formed at the upper end of the penetration flow path, ensuring that the paint passes through the position limiting member.

[0020] In one embodiment, the upper surface of each position limiting post is an arc surface or a curved surface. According to the present technical solution, a larger opening can be formed at the upper end of the penetration flow path, ensuring that the paint passes through the position limiting member.

[0021] In one embodiment, each position limiting post is provided in parallel on a plane perpendicular to the axial direction of the cover. By providing the position limiting posts in parallel, it is ensured that the position limiting posts are smoothly demolded during thermoplastic processing.

[0022] In one embodiment, the position limiting member is a stopper bar, and the penetration flow path is a through hole or a guide groove opened in the stopper bar. By forming the penetration flow path by opening holes and grooves in the bar-shaped member, more structural forms are provided for the cover structure, and problems caused by the paint staying or solidifying are avoided.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0024] Hereinafter, with reference to the accompanying drawings, the technical solutions in the embodiments will be clearly and completely described. It is clear that the embodiments described here are only some of the embodiments of the present application and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative labor belong to the protection scope of the present application.

[0025] In the description of the present application, the directions and positional relationships indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the directions and positional relationships shown in the accompanying drawings, and are only for the convenience of description of the present application and to simplify the description, and do not indicate or suggest that the devices or components mentioned must have a specific direction and be structured or operated in a specific direction, so it should not be understood as a limitation to the present application.

[0026] The terms "first", "second", "third" are for explanatory purposes only and should not be understood as indicating or suggesting relative importance or implicitly indicating the quantity of the technical features indicated. Thus, the features limited as "first", "second", "third" can explicitly or implicitly include one or more of the said features.

[0027] In the description of the present application, unless otherwise specified, the terms "attach", "connect", and "couple" should be understood in a broad sense. For example, they may be fixedly connected, detachably connected or integrally connected, directly connected, indirectly connected through an intermediate medium, or communicate inside two components. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0028] In the present application, the spray gun for performing the spraying operation has a joint 4. The joint 4 is integrally connected to the spray gun or detachably attached to the spray gun. The joint 4 is for connecting a liquid storage container. Thereby, the liquid storage container is fixed to the spray gun, the paint stored in the liquid storage container is supplied to the spray gun, and the spraying operation is realized by spraying the paint through the spray gun.

[0029] As shown in FIGS. 1 to 8, the present application provides a cover structure of a liquid storage container (simply referred to as a cover structure) including a cover 1, a connection port 2, and a position limiting member 3. The connection port 2 is provided on the upper part of the cover 1, and the position limiting member 3 is provided on the side wall of the connection port 2. At least one position limiting member 3 is provided, for example, it may be one, two, three, etc. As shown in FIG. 3, the above cover structure has two position limiting members 3 symmetrically provided on the side wall of the connection port 2.

[0030] The liquid storage container has a liquid storage cup (not shown) for storing paint. The cover 1 is attached to the liquid storage cup, so that the mouth of the liquid storage cup is sealed (for example, the bottom of the cover 1 is connected to the mouth of the liquid storage cup by screws). The connection port 2 of the cover 1 is the only passage for communicating the liquid storage cup with the external space. When the liquid storage container is attached to the spray gun, the connection port 2 is inserted into the joint 4 of the spray gun, and the connection member 40 of the joint 4 fixes the liquid storage container to the joint 4.

[0031] To facilitate the installation and removal of the liquid reservoir, the joint 4 realizes a fixed connection with the liquid reservoir by a screwing method. Specifically, the connection member 40 of the joint 4 has a rotary connection portion 401. After inserting the connection port 2 upward into the joint 4, the liquid reservoir or the joint 4 is rotated to rotate the rotary connection portion 401 relative to the connection port 2, so that the rotary connection portion 401 is screwed under the position limiting member 3 and locked by the position limiting member 3. Thereby, the movement of the rotary connection portion 401 in the axial direction of the cover 1 is blocked, and the joint 4 is stably connected to the connection port 2.

[0032] When it is necessary to replace the paint during the spraying operation, it is necessary to remove the currently used liquid reservoir. By rotating the spray gun or the liquid reservoir to rotate the rotary connection portion 401 relative to the cover 1, the rotary connection portion 401 exits from the space under the position limiting member 3, and the restriction on the axial movement of the rotary connection portion 401 by the position limiting member 3 is released, and the rotary connection portion 401 is axially detached from the connection port 2.

[0033] When placing the removed liquid reservoir on a table, turn the connection port 2 of the liquid reservoir upward so that the paint does not spill from the liquid reservoir. However, during spraying operation, the paint in the liquid reservoir enters the inside of the joint 4 through the connection port 2, and a part of the paint that enters the joint 4 soaks into the gap between the joint 4 and the connection port 2. As a result, it adheres to the side wall of the connection port 2 when the liquid reservoir is removed. When placing the liquid reservoir on the table with the connection port 2 facing upward, the adhered paint flows downward along the side wall of the connection port 2 and falls onto the protruding position limiting member 3. When the paint solidifies above the position limiting member 3, since the connection port 2 above the position limiting member 3 needs to be inserted into the joint 4, the outer diameter of this part of the connection port 2 becomes thicker due to the solidified paint, making it difficult to insert the connection port 2 into the joint 4. Even if the connection port 2 is forcibly inserted, the solidified paint becomes fragments and enters the inside of the joint 4, and further enters the spray gun, causing clogging. To solve this problem, a penetration flow path 5 is provided in the position limiting member 3 in the present application. The penetration flow path 5 is drilled in the position limiting member 3. When placing the liquid reservoir on the table with the connection port 2 facing upward, after the adhered paint flows downward along the side wall of the connection port 2 and reaches the position limiting member 3, it further passes through the penetration flow path 5, passes through the position limiting member 3, and flows to the lower side of the position limiting member 3, thereby avoiding the paint accumulating in the connection port 2 above the position limiting member 3. As a result, it is avoided that the connection port 2 becomes thicker and difficult to insert into the joint 4, and that fragments enter the spray gun when the connection port 2 is forcibly inserted into the joint 4, causing clogging of the spray gun.

[0034] A connection and fixing area 30 is formed below the position limiting member 3. After the rotary connection portion 401 of the joint 4 is screwed into the connection and fixing area 30 from one end, if the movement stroke of the rotary connection portion 401 cannot be accurately controlled, the rotary connection portion 401 may come out of the connection and fixing area 30 at the other end. As a result, the position limiting member 3 cannot effectively position-limit and fix the rotary connection portion 401, and furthermore, the liquid reservoir cannot be effectively fixed to the joint 4 of the spray gun. For this reason, in some embodiments, as shown in FIGS. 1 to 4 and FIG. 8, the position limiting member 3 has a protrusion 301. After the rotary connection portion 401 of the joint 4 is screwed into the connection and fixing area 30 from one end, the rotary connection portion 401 of the connection member 40 or another part of the connection member 40 is locked to the protrusion 301, and the movement of the connection member 40 is received by the protrusion 301, so that the rotary connection portion 401 is restricted by the connection and fixing area 30, and the rotary connection portion 401 is prevented from coming out of the other end of the connection and fixing area 30. Effective position limitation and fixing of the rotary connection portion 401 by the position limiting member 3 are ensured, and furthermore, the liquid reservoir is maintained to be effectively fixed to the joint 4 of the spray gun.

[0035] In some embodiments, as shown in FIGS. 2, 4 and 8, the upper surface of the position limiting member 3 is located on a plane perpendicular to the axial direction of the cover 1. The connection member 40 is provided on the end face of the joint 4. When the upper surface of the position limiting member 3 is in close contact with the end face of the joint 4, the rotary connection portion 401 is aligned with the space below the position limiting member 3, so that the rotary connection portion 401 can be smoothly screwed into the connection and fixing area 30 below the position limiting member 3.

[0036] When the connection port 2 is attached to the joint 4 by fitting the upper surface of the position limiting member 3 and the end surface of the joint 4, the position limitation when the connection port 2 is attached to the joint 4 is realized, so that the rotary connection portion 401 is aligned with the connection fixing area 30 and screwed in. As a result, it is not necessary to press the connection member 40 of the joint 4 against the end surface of the cover 1, the position limiting member 3 can be further separated from the end surface of the cover 1, and accordingly, the rotary connection portion 401 can be brought closer to the end surface of the joint 4, the axial thickness of the connection member 40 is reduced, and the structure of the joint 4 can be made more compact.

[0037] In some embodiments, as shown in FIGS. 4 and 8, the lower surface of the position limiting member 3 has a guide surface 302, and the guide surface 302 is provided to incline downward.

[0038] When the connection fixing area 30 is formed between the position limiting member 3 and the end surface of the cover 1, the width of the connection fixing area 30 gradually becomes narrower along the screwing direction by the rotary connection portion 401 due to the downwardly inclined guide surface 302. When the rotary connection portion 401 is screwed into the connection fixing area 30, as the portion of the rotary connection gradually increases, the position limiting member 3 and the end surface of the cover 1 firmly sandwich the rotary connection portion 401, so that the position limitation and fixing stability for the rotary connection portion 401 are improved, and the stability when the liquid storage device is attached to the joint 4 of the spray gun is improved.

[0039] When realizing the position limitation so that the rotary connection portion 401 is aligned with the connection fixing area 30 by the contact fitting between the end surface of the joint 4 and the position limiting member 3, in the process of the rotary connection portion 401 entering the connection fixing area 30 along its screwing direction, the rotary connection portion 401 slides along the downwardly inclined guide surface 302, so that the position limiting member 3 gradually applies a downward pressure to the rotary connection portion 401 by the guide surface 302, and the end surface of the joint 4 is firmly pressed against the position limiting member 3. Similarly, the stability when the liquid storage device is attached to the joint 4 of the spray gun is improved.

[0040] In some embodiments, as shown in FIG. 5, the connecting member 40 of the joint 4 has a boss 402, the rotary connecting portion 401 is provided on the boss 402, and when the upper part of the connection port 2 is inserted into the joint 4, the boss 402 is located outside the lower part of the connection port 2, that is, the position limiting member 3 is located inside the boss 402.

[0041] The outer surface of the position limiting member 3 is in close contact with the inner surface of the boss 402 to make the position limiting member 3 and the boss 402 in an interference fit, and the rotary connecting portion 401 is screwed into the connection fixing area 30 below the position limiting member 3, so as to realize a stable connection between the liquid storage device and the joint 4, and improve the stability after the liquid storage device is installed.

[0042] In some embodiments, as shown in FIGS. 1-4, the position limiting member 3 includes at least two protruding position limiting posts 303, and the two position limiting posts 303 are arranged along the screwing direction by the rotary connecting portion 401, and the penetration flow path 5 is formed by the interval between two adjacent position limiting posts 303.

[0043] When the position limiting member 3 is formed by the position limiting posts 303 arranged in sequence, compared with the case where the position limiting member 3 is a bar-shaped member and holes or grooves are opened in the bar-shaped member to form the penetration flow path 5, the amount of material used is less, the cost is lower, and the position limiting posts 303 can also be processed by thermoplastic molding to form the penetration flow path 5, making production and manufacturing easier.

[0044] Furthermore, as shown in FIGS. 1-4, the position limiting post 303 is divided into a stopper post 3031 and a guide post 3032. As shown in FIG. 5, the connecting member 40 has a boss 402, one side of the boss 402 is connected to the end face of the joint 4, and the other side is connected to the rotary connecting portion 401.

[0045] When the position limiting member 3 has a protrusion 301 for restricting the rotation of the joint 4 with respect to the cover 1, the protrusion 301 is formed on the stopper post 3031. When the rotary connection portion 401 is screwed into the connection fixing area 30 below the position limiting member 3 and the end face of the boss 402 and / or the end face of the rotary connection portion 401 contacts the stopper post 3031, the stopper post 3031 abuts against either one of them, thereby restricting the rotation of the joint 4 with respect to the cover 1. That is, further movement of the rotary connection portion 401 is blocked, and it is avoided that the movement stroke of the rotary connection portion 401 is too large and it comes out of the connection fixing area 30. Thus, the rotary connection portion 401 is stably position-limited and fixed by the position limiting member 3, that is, the liquid storage container can be stably attached to the joint 4.

[0046] As shown in FIG. 3, when the outer surface of the position limiting member 3 and the inner surface of the boss 402 are in an interference fit, the entire outer end face of the guide post 3032 is located on the same circumference centered on the axis of the cover 1.

[0047] Furthermore, as shown in FIGS. 1 to 3, in the radial direction and / or the axial direction of the cover 1, the stopper post 3031 protrudes with respect to the guide post 3032. More specifically, the stopper post 3031 protrudes outward in the radial direction of the cover 1 with respect to the guide post 3032. When the rotary connection portion 401 is screwed into the connection and fixing area 30, the guide post 3032 moves inside the boss 402, and the outer end of the protruding stopper post 3031 is locked to the end of the boss 402. Thereby, the rotation of the joint 4 with respect to the cover 1 is restricted, and the rotary connection portion 401 is positionally restricted to the connection and fixing area 30 below the position restricting member 3. The stopper post 3031 protrudes in the axial direction of the cover 1 with respect to the guide post 3032, so that the stopper post 3031 extends longer than the guide post 3032 into the connection and fixing area 30. When the rotary connection portion 401 is screwed into the connection and fixing area 30, the lower side of the stopper post 3031 is locked to the end of the rotary connection portion 401, thereby restricting the rotation of the joint 4 with respect to the cover 1, and the rotary connection portion 401 is positionally restricted to the connection and fixing area 30 below the position restricting member 3.

[0048] By adopting at least one of the above two protruding methods, the stopper post 3031 can effectively positionally restrict the rotation of the joint 4. That is, by simply expanding the outer shape of the stopper post 3031 in either the axial direction or the radial direction of the cover 1, the rotation of the joint 4 can be effectively positionally restricted. The realization method is simple and the manufacturing and processing are also easy. The stopper post 3031 having an outer dimension larger than that of the guide post 3032 may be processed by thermoplastic molding.

[0049] Furthermore, as shown in FIG. 4, when the lower surface of the position limiting member 3 has a guide surface 302 provided with a downward inclination, at least two guide posts 3032 arranged in succession constitute the guide surface 302. Each of the guide posts 3032 may be arranged such that the outer diameter increases in order along the screwing direction by the rotary connection portion 401, or the outer diameters may be the same and they may be arranged in order at an angle inclined along the screwing direction by the rotary connection portion 401, and finally the line connecting the lowermost ends of each of the guide posts 3032 is in a state of being inclined downward with respect to a plane perpendicular to the axial direction of the cover 1. That is, the lower surfaces of the guide posts 3032 arranged in order are combined with each other to form the guide surface 302. In the process of being screwed into the connection fixing area 30, the rotary connection portion 401 is firmly clamped because the space gradually becomes smaller, or the rotary connection portion 401 sequentially passes through each of the guide posts 3032 and is sequentially pushed downward. Thereby, by providing the inclined guide surface 302 on the lower surface of the position limiting member 3, the stability when the liquid storage container is attached to the joint 4 of the spray gun is improved.

[0050] Furthermore, the lower surface of the guide post 3032 is an arc surface, a curved surface or a spherical surface. Thereby, the lower surface of the guide post 3032 becomes a smooth surface. After the rotary connection portion 401 comes into contact with the guide post 3032 from the side, it is guided by the smooth surface and slides to the lower side of the guide post 3032, and can further move to the next adjacent guide post 3032. By forming a sharp corner on the lower surface of the guide post 3032, it is avoided that the screwing movement of the rotary connection portion 401 is hindered.

[0051] In some embodiments, the stopper post 3031 is located at the central portion or one end of the position limiting member 3.

[0052] When the stopper post 3031 is located at the center of the position limiting member 3, guide posts 3032 are arranged on both sides of the stopper post 3031. As a result, two connection and fixing areas 30 are formed on both sides of the stopper post 3031 respectively under the position limiting member 3. The rotary connection part 401 can be screwed into the corresponding connection and fixing area 30 from the lower side of both ends of the position limiting member 3 in two rotation directions, realizing the torsional connection in both directions between the joint 4 and the liquid storage container, and improving the flexibility of the connection and installation of the liquid storage container.

[0053] When the stopper post 3031 is located at one end of the position limiting member 3, the rotary connection part 401 can only be screwed into the connection and fixing area 30 from one end of the position limiting member 3 away from the stopper post 3031. When it is necessary to remove the liquid storage container, the rotary connection part 401 rotates along the direction opposite to the screwing direction, and when the rotary connection part 401 abuts against the side away from the guide post 3032 of the stopper post 3031, it is avoided that the rotary connection part 401 enters the connection and fixing area 30 again and is position-limited and fixed when rotating in the reverse direction, ensuring the smooth removal of the liquid storage container.

[0054] In some embodiments, as shown in FIGS. 1, 2 and 4, when the stopper post 3031 is located at one end of the position limiting member 3, a cut surface 304 parallel to the axial direction of the cover 1 is provided on the side wall on the side away from the guide post 3032 of the stopper post 3031.

[0055] When it is necessary to remove the liquid reservoir, the rotary connection part 401 rotates along the direction opposite to the screwing direction and abuts on the side away from the guide post 3032 of the stopper post 3031. Since a cut surface 304 is provided on the side of this stopper post 3031, the rotary connection part 401 can be smoothly slid along the cut surface 304 and further detached from the position limiting member 3, and the joint 4 can be smoothly removed from the liquid reservoir. Since the surface on the side away from the guide post 3032 of the stopper post 3031 protrudes, it is avoided that the axial detachment of the rotary connection part 401 is hindered.

[0056] Also, the cut surface 304 can reduce the smoothness of the surface of the stopper post 3031. That is, relatively sharp locking angles are formed at the upper and lower edges of the cut surface 304. When the rotary connection part 401 rotates along the direction opposite to the screwing direction and abuts on the stopper post 3031, the rotary connection part 401 is locked by the locking angle formed on the cut surface 304, and it can be prevented that the rotary connection part 401 slides on the lower surface of the stopper post 3031. Thereby, it is prevented that the rotary connection part 401 is screwed again into the connection and fixing area below the position limiting member, and it is avoided that it becomes difficult to remove the joint 4 from the liquid reservoir.

[0057] In some embodiments, the cross-section of the position limiting post 303 is circular, elliptical and triangular.

[0058] As shown in FIGS. 1 to 4, when the position-limiting post 303 is circular or elliptical, not only is thermoplastic forming easy, but the penetration flow path 5 also takes the shape of an hourglass, and the upper end is flared from bottom to top. As a result, the opening at the upper end of the penetration flow path 5 becomes larger, the paint more easily flows into the penetration flow path 5, the speed at which the paint passes through the position-limiting member 3 increases, and solidification of the paint above the position-limiting member 3 is avoided. Further, since the cross-section of the position-limiting post 303 is circular or elliptical, its upper surface becomes a smooth surface, the flow effect of the paint is improved, and after the paint contacts the position-limiting post 303, it more easily slides into the penetration flow path 5 and is less likely to accumulate on the surface of the position-limiting post 303. Also, when it is necessary to provide an inclined guide surface 302 on the position-limiting member 3, since the cross-section of the position-limiting post 303 is circular or elliptical, the rotation connection portion 401 is not caught, and smooth screwing can be reliably ensured. As shown in FIG. 6, when the position-limiting post 303 is triangular, with one corner at the top and the other two corners at the bottom, a V-shaped penetration flow path 5 is formed. Also in this case, the opening at the upper end of the penetration flow path 5 can be enlarged to allow the paint to more easily flow into the penetration flow path 5.

[0059] In some embodiments, the upper surface of the position-limiting post 303 is an arcuate surface or a curved surface. More specifically, as shown in FIG. 7, the position-limiting post 303 can adopt a cross-sectional shape in which only the upper surface is a smooth surface such that the upper end of the penetration flow path 5 is flared from bottom to top. As a result, the opening at the upper end of the penetration flow path 5 becomes larger, and the paint more easily flows into the penetration flow path 5. Also, by making the upper surface of the position-limiting post 303 a smooth surface, the flow effect of the paint is improved, and after the paint contacts the position-limiting post 303, it more easily slides into the penetration flow path 5 and is less likely to accumulate on the surface of the position-limiting post 303.

[0060] In some embodiments, as shown in FIG. 3, all of the position-limiting posts 303 are provided parallel to each other on a plane perpendicular to the axial direction of the cover 1.

[0061] To facilitate manufacturing and processing, the structure of the cover 1 is processed by a thermoplastic molding process. During the processing, two molds move towards each other, sandwiching the blank in the middle from both sides respectively. There are molding grooves on the inner surface of the molds. Gas is injected into the blank, and the blank is inflated to fill the molding grooves, thereby processing the blank into the structure of the cover 1 with a predetermined outer contour. Further, the two molds move away from each other and separate from the formed structure of the cover 1, thus completing the demolding of the structure of the cover 1. Generally, to move the molds, the molds are driven by a hydraulic cylinder, and the two molds move towards or away from each other on the same straight line.

[0062] Each position limiting post 303 is provided in parallel, that is, parallel to the moving direction of the two molds. Thereby, during demolding, all the position limiting posts 303 can directly exit from the corresponding molding grooves in the molds, avoiding deformation of the position limiting posts 303 by the molds and improving the accuracy of manufacturing and processing. At the same time, when it is necessary to make one position limiting post 303 into a stopper post 3031 with a relatively large outer dimension, only by increasing the width and / or depth of the corresponding molding groove, the processed stopper post 3031 can be protruded in either the radial direction or the axial direction of the cover 1 and abutted against the connecting member 40 to achieve rotation limitation.

[0063] In some embodiments, as shown in FIG. 8, the position limiting member 3 is a stopper bar, and the penetration flow path 5 is a through hole or a guide groove opened in the stopper bar. Thereby, the paint can pass through the penetration flow path 5 and pass through the position limiting member 3, avoiding the paint accumulating and solidifying on the upper side of the position limiting member 3.

[0064] By opening holes and grooves in the stopper bar, the flow of the paint can be realized. However, by opening holes and grooves in the existing structure, it can also be used as the technical solution of the present application. More structural forms are provided for the structure of the cover 1, realizing smooth installation of the reservoir, avoiding clogging of the spray gun, providing room for modification, and improving the flexibility of the structure.

[0065] Finally, what needs to be explained is as follows: Each embodiment in this specification is described step by step. In each embodiment, the differences from other embodiments are mainly described, and for the same or similar parts between each embodiment, reference can be made to each other.

[0066] The above embodiments are only for explaining the technical solutions of this application and do not limit it. Although this application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that, without departing from the spirit of the technical solutions of this application, modifications to the specific embodiments of this application or equivalent replacements for some technical features are included in the scope of the claims of this utility model registration.

Explanation of Reference Signs

[0067] 1 Cover 2 Connector 3 Position Limiting Member 30 Connection and Fixing Area 301 Protrusion 302 Guide Surface 303 Position Limiting Post 3031 Stopper Post 3032 Guide Post 304 Cut Surface 4 Joint 40 Connection Member 401 Rotating Connection Part 402 Boss 5 Penetration Flow Path

Claims

1. A cover, a connection port provided on the upper part of the cover, a position limiting member provided on the side wall of the connection port, wherein when a rotary connection part provided on a connection member of a joint is screwed under the position limiting member, the movement of the cover of the joint in the axial direction is restricted by the position limiting member, a penetration flow path provided in the position limiting member, which is a penetration flow path for the paint adhering to the side wall of the connection port to pass through the position limiting member through the penetration flow path, including A cover structure of a liquid storage device, characterized in that.

2. The position limiting member has a protrusion and is configured to be lockable to the connection member of the joint so as to limit the rotation of the joint with respect to the cover structure. The cover structure of the liquid storage device according to claim 1, characterized in that.

3. The upper surface of the position limiting member is located on a plane perpendicular to the axial direction of the cover, the connection member is provided on the end face of the joint, when the upper surface of the position limiting member is in close contact with the end face of the joint, the rotary connection part is aligned with the space below the position limiting member. The cover structure of the liquid storage device according to claim 1, characterized in that.

4. The lower surface of the position limiting member has a guide surface for sliding contact with the rotary connection part, and the guide surface is provided with a downward inclination. The cover structure of the liquid storage device according to claim 1, characterized in that.

5. The connection member has a boss, the rotary connection part is provided on the boss, the outer surface of the position limiting member is in interference fit and in close contact with the inner surface of the boss. The cover structure of the liquid storage device according to claim 1, characterized in that.

6. The position limiting member includes at least two position limiting posts, and the penetration flow path is located between two adjacent position limiting posts. The cover structure of the liquid storage device according to any one of claims 1 to 5, characterized in that.

7. The position limiting member includes at least two position limiting posts, the penetration flow path is located between two adjacent position limiting posts, and the position limiting posts are divided into stopper posts and guide posts. The connection member has a boss, one side of the boss is connected to the end face of the joint, and the other side is connected to the rotary connection part. When the stopper post abuts against the end face of the boss and / or the end face of the rotary connection part, the rotation of the joint with respect to the cover structure is restricted. The cover structure of the liquid storage container according to claim 1 or 2, characterized in that.

8. The stopper post is protruded with respect to the guide post in the radial direction and / or the axial direction of the cover. The cover structure of the liquid storage container according to claim 7, characterized in that.

9. The lower surface of the position limiting member has a guide surface for sliding contact with the rotary connection part. The guide surface is provided to be inclined downward, and the guide surface is constituted by at least two of the guide posts arranged continuously. The cover structure of the liquid storage container according to claim 7, characterized in that.

10. The lower surface of the guide post is an arc surface, a curved surface or a spherical surface. The cover structure of the liquid storage container according to claim 9, characterized in that.

11. The stopper post is located at the center or one end of the position limiting member. The cover structure of the liquid storage container according to claim 7, characterized in that.

12. When the stopper post is located at one end of the position limiting member, a cut surface parallel to the axial direction of the cover is provided on the side wall of the stopper post on the side away from the guide post. The cover structure of the liquid storage container according to claim 11, characterized in that.

13. The cross section of each of the position limiting posts is circular, elliptical or triangular. The cover structure of the liquid storage container according to claim 6, characterized in that.

14. The upper surface of each of the position limiting posts is an arc surface or a curved surface. The cover structure of the liquid storage container according to claim 6, characterized in that.

15. Each of the position limiting posts is provided in parallel on a plane perpendicular to the axial direction of the cover. The cover structure of the liquid storage container according to claim 6, characterized in that.

16. The position limiting member is a stopper bar, and the penetration flow path is a through hole or a guide groove opened in the stopper bar. The cover structure of the liquid storage container according to any one of claims 1 to 5, characterized in that.

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