A split outer cup and fluid supply cup and methods of using the same

Abstract

The application provides a split outer cup and fluid supply cup and a use method thereof, comprising a cup base and a cup holder, a locking structure is arranged at a cover opening of the cup holder, the cup holder and the cup base are spliced through a matching structure, the matching structure comprises a mechanical feature one arranged at a splicing opening one of the cup base and a mechanical feature two arranged at a splicing opening two of the cup holder, the mechanical feature one and the mechanical feature two are axially butted, and the cup base forms axial positioning and radial positioning on the cup holder. The application realizes circumferential positioning through concave-convex structure occlusion, prevents relative rotation of the cup base and the cup holder after cooperation, is beneficial to hand holding of the cup body, and facilitates locking assembly of the remaining components. The convex cup wall is used for forming movement support of the inner liner, in a reciprocating swing operation, shaking of the inner liner caused by left and right movement of the liquid center of gravity is eliminated, spraying stability is improved, and hand fatigue is reduced. The concave cup wall is used for exposing the inner liner, is beneficial to observation and manual adjustment of collapse of the inner liner, and reduces weight and a center of gravity.

Description

Technical Field

[0001] This invention belongs to the technical field of spraying equipment, and relates to a spray cup, particularly a split-type outer cup and fluid supply cup and its usage method. Background Technology

[0002] Current spray guns mainly use pneumatic methods to atomize the paint before spraying. Therefore, it is necessary to supply paint to the spray gun. The most common method is to connect a paint supply cup to the spray gun. This method can ensure that the supply cup and the spray gun move simultaneously, and the paint is continuously pressed into the spray gun by gravity, and then sprayed out after being atomized by compressed gas.

[0003] For example, Chinese patent document CN217450601U discloses a fluid supply cup and outer retaining ring for a spraying equipment. The cup has a cap with a fluid outlet, an inner liner with a flange, a rigid outer cup with an open end, and an outer retaining ring releasably connected to the outer cup. The outer retaining ring secures both the inner liner and the cap to the outer cup. Multiple external threads are evenly arranged on the circumference of the upper edge of the outer cup, and these external threads are adapted to the internal threads. The outer retaining ring then connects the inner cup, cap, and outer cup together. The multi-segment internal and external threads extend over a small portion of the circumference, facilitating demolding during processing. This simplifies the mold and reduces the time required for mold-forming products, significantly improving production efficiency. The small locking stroke angle of the multi-segment internal and external threads shortens the rotation stroke, reducing the unlocking and locking stroke during manual rotation, thus saving time and effort. Furthermore, the through-hole on the outer retaining ring can also serve as a gripping point, facilitating user operation.

[0004] In the above technical solution, the rigid outer cup has a complete cup body from the bottom to the mouth, and the rigid outer cup completely accommodates the inner liner. That is, the complete cup body of the outer cup and the inner liner are installed together on the spray gun. In the use state, the rigid outer cup and the inner liner are connected to the spray gun in an inverted position. The liquid in the inner liner sinks due to the inversion, creating a gap between the bottom of the inner liner and the rigid outer cup. Because the inner liner is a soft, thin-walled structure, it collapses when the internal liquid is discharged; however, the rigid outer cup is a hard, thin-walled structure, which always maintains its cylindrical shape.

[0005] During the spray painting operation, the operator needs to hold the spray gun and swing it back and forth to spray. The liquid material gradually descends during the spraying process, and the inner lining gradually collapses downward. Only the bottom of the rigid outer cup permanently maintains its height position. As a result, the bottom of the rigid outer cup generates centrifugal gravity during the back and forth swinging, which can easily cause hand fatigue for the operator, thereby reducing work efficiency and spraying quality.

[0006] On the other hand, the bottom of existing rigid outer cups can be either closed or open, neither of which fully exposes the inner lining. During the spraying process that causes the inner lining to collapse, especially when one cup of paint is almost finished, the severe shrinkage of the inner lining leads to uneven collapse, resulting in uneven paint supply and affecting the continuity and uniformity of the paint spraying. Because the rigid outer cup has a bottom that blocks the view, a person cannot reach inside the rigid outer cup to adjust the collapse state of the inner lining, thus failing to improve the problem of uneven paint spraying.

[0007] Furthermore, the complete cup body increases the weight of the overall liquid supply device and also increases production costs. For each cup cap with different diameter, model and shape, a corresponding rigid outer cup needs to be injection molded. Summary of the Invention

[0008] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a split-type outer cup and fluid supply cup, as well as a method for using them.

[0009] The objective of this invention can be achieved through the following technical solution: a split outer cup, including a cup base and a cup holder, wherein a locking structure is provided at the cap opening of the cup holder, and the cup holder and the cup base are spliced ​​together by a mating structure, wherein the mating structure includes a mechanical feature one provided at a splicing interface of the cup base and a mechanical feature two provided at a splicing interface of the cup holder, the mechanical feature one and the mechanical feature two are axially connected, and the cup base provides axial and radial positioning for the cup holder.

[0010] Preferably, the first mechanical feature is that a docking platform is provided on the splicing interface of the cup holder, the docking platform includes an inlet edge with an inclined outer wall, the outer periphery of the inlet edge surrounds the overlapping surface, the second mechanical feature is that a docking edge is provided on the splicing interface of the cup holder, the inner periphery of the docking edge has an inclined inner wall, the docking edge is fastened to the outer periphery of the inlet edge, the end edge of the docking edge is placed on the overlapping surface of the docking platform to form axial positioning, and the inclined inner wall fits against the inclined outer wall to form radial positioning.

[0011] Preferably, the first mechanical feature has a first shape, and the second mechanical feature has a second shape; the first shape along the axis has at least one concave point and at least one convex point, and a transition segment 1 is formed between the first concave point and the first convex point; the second shape along the axis has at least one concave point and at least one convex point, and a transition segment 2 is formed between the second concave point and the second convex point; the first concave point and the second convex point are aligned, the first convex point and the second concave point are aligned, and the first transition segment and the second transition segment are correspondingly joined; the second convex point and its adjacent portion of the second transition segment form a supporting portion.

[0012] Preferably, the first shape is one wave cycle, two wave cycles, or multiple wave cycles, wherein one wave cycle has one concave point 1 and one convex point 1, two wave cycles have two concave points 1 and two convex points 1, and multiple wave cycles have multiple concave points 1 and multiple convex points 1; the second shape is one wave cycle, two wave cycles, or multiple wave cycles, wherein one wave cycle has one concave point 2 and one convex point 2, two wave cycles have two concave points 2 and two convex points 2, and multiple wave cycles have multiple concave points 2 and multiple convex points 2.

[0013] Preferably, a locking seat protrudes from the outer wall of the cup holder, and a locking hole is opened on the locking seat. A locking block protrudes from the outer wall of the cup holder, and a locking pin is provided on the locking block. The cup holder and the cup holder are joined together axially and rotated circumferentially. The locking pin is inserted into the locking hole along the rotation trajectory.

[0014] Preferably, the locking structure is a locking ring, with a constraint area set around the outer periphery of the cup holder. The locking ring is placed within the constraint area to form circumferential free rotation and axial range movement. A flange is provided on the cap opening of the cup holder, and an annular protrusion is provided on the outer wall of the cup holder. The outer wall of the cup holder between the annular protrusion and the flange forms the aforementioned constraint area. The side of the annular protrusion facing the flange forms a limiting surface, and the side of the annular protrusion facing away from the flange forms a guiding surface.

[0015] Preferably, the cup holder is configured as an open opening, with an annular step on the outer periphery of the open opening, and a plurality of internal thread segments on the inner wall of the annular step.

[0016] Preferably, a cylindrical frame is placed on the inner circumference of the cup holder, and a mounting plate is provided on the outer wall of the cylindrical frame. The mounting plate overlaps the sealing opening of the cup holder. An annular step two is provided inside the port of the cylindrical frame, and several internal thread segments are provided on the inner wall of the annular step two.

[0017] A fluid supply cup includes an inner liner and a cup lid, and also includes the aforementioned split outer cup. The inner liner is placed in the cup base and cup holder, and the cup lid is fastened to the inner liner in a sprayed state. The locking structure locks the cup holder, inner liner and cup lid to form an assembly fit, and detaches them from the cup base.

[0018] A method of using a fluid supply cup, applied to the aforementioned fluid supply cup, involves removing the assembled cup holder, liner, and cup lid from the cup base, connecting the liquid supply port of the cup lid to the liquid inlet of the spray gun, with the liner in an inverted state, and the cup wall of the cup holder providing support to the flexible wall of the liner.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Split-assembly structure:

[0021] The cup body is divided into a combinable cup holder and a cup support. When combined, the two parts house the inner liner, forming a complete rigid support that allows the liner to be placed stably upright, facilitating the injection of paint into the soft liner. After the liner is sealed, the cup is loaded and assembled. By separating the two parts and retaining only the cup support or cup holder with the liner, the other part is discarded, reducing the overall weight of the supply cup. This also lowers the center of gravity when the cup is inverted, improving ease of handling and reducing hand fatigue. Furthermore, it enhances the stability of reciprocating spraying, extends work time, and optimizes the spraying effect. Therefore, using two combined parts provides complete support, while separate parts retain only partial support, meeting the needs of different usage scenarios and cleverly utilizing the modular design to achieve application flexibility.

[0022] 2. Lining adjustment procedure:

[0023] The system employs a separate cup holder and cup support, with the cup holder or cup support only partially covering the inner liner's perimeter wall. In the inverted feeding state, the bottom of the inner liner is completely exposed. The interior of the liner is a closed space; as the paint flows out, the liner will collapse due to external air pressure. When a certain amount of liquid is discharged, the collapse of the liner will become uneven, resulting in uneven paint supply and inconsistent coating thickness. Operators can manually adjust the exposed bottom of the liner to even it out, ensuring uniform liquid supply and consistent coating thickness.

[0024] 3. Dock structure design:

[0025] The splicing interface between the cup holder and the cup rack is designed to overlap and nest together. Axial support is achieved by the mating of the guide edge and the overlapping surface, and radial positioning is achieved by the sleeve of the mating edge onto the guide edge.

[0026] By cleverly combining axial and radial forces, the stability of the cup holder and cup support is improved, preventing misalignment and slippage. This achieves mutual support and positioning between the cup holder and cup support, thus assembling a complete cup structure. The inner liner is then placed into the complete cup body to provide rigid support, which helps the flexible inner liner to accommodate the paint.

[0027] 4. Splicing shape design:

[0028] The interface between the cup holder and the cup support is designed with an undulating, non-planar shape. This allows the cup holder and cup support to axially align at a specific angle. Firstly, the interlocking of the concave and convex structures achieves circumferential positioning, preventing relative rotation after the cup holder and cup support are engaged, improving stability and facilitating hand grip on the cup. This allows for locking and assembling of other components. Secondly, the protruding cup wall provides support for the inner liner during reciprocating oscillations, eliminating liner swaying caused by the lateral shift of the liquid's center of gravity during spraying, improving spraying stability and reducing hand fatigue. The concave cup wall exposes the inner liner, facilitating observation and manual adjustment of liner collapse, while also reducing weight and lowering the center of gravity, alleviating hand fatigue during prolonged operation.

[0029] 5. Multiple locking methods:

[0030] A locking ring is installed on the cup holder, and a cylindrical frame can also be used inside the cup holder. An annular step and an internal thread section are set on the cup base. As a result, the overall outer cup can provide a variety of matching methods with the cup lid, including different models and different sizes. This allows the same outer cup to be used with a variety of different liners and cup lids, thereby saving design and production costs for the outer cup, expanding the scope of use and flexibility of the outer cup, and increasing the product's market competitiveness in the same field.

[0031] 6. Add a locking structure:

[0032] Locking seats and locking blocks are fitted together on the cup holder and cup frame. The two can be easily connected and separated by screwing. The combination of locking seats and locking blocks ensures a firm fit between the cup holder and cup frame, further ensuring the stable support of the outer cup to the inner lining. This prevents the cup holder and cup frame from misaligning or detaching, which could cause the liquid in the inner lining to spill, thus improving the safety of the filling process. Attached Figure Description

[0033] Figure 1 This is an exploded structural diagram of the first embodiment of the present invention.

[0034] Figure 2 This is a structural diagram of the outer cup fitting according to the first embodiment of the present invention.

[0035] Figure 3 This is an assembly cross-sectional view of the second embodiment of the present invention.

[0036] Figure 4 This is a structural diagram of the outer cup in a second embodiment of the present invention.

[0037] Figure 5 This is a structural diagram of the usage state of the second embodiment of the present invention.

[0038] Figure 6 This is an assembly external structure diagram of the third embodiment of the present invention.

[0039] Figure 7This is a structural diagram of the usage state of the third embodiment of the present invention.

[0040] Figure 8 This is an assembly external structure diagram of the fourth embodiment of the present invention.

[0041] Figure 9 This is a partially enlarged structural diagram of the fourth embodiment of the present invention.

[0042] Figure 10 This is an exploded structural diagram of the fourth embodiment of the present invention.

[0043] Figure 11 This is an exploded structural diagram of the fifth embodiment of the present invention.

[0044] Figure 12 This is a structural diagram of the usage state of the fifth embodiment of the present invention.

[0045] Figure 13 This is an exploded structural diagram of the sixth embodiment of the present invention.

[0046] Figure 14 This is a structural diagram of the tube frame installation according to the sixth embodiment of the present invention.

[0047] Figure 15 This is a complete assembly structure diagram of the sixth embodiment of the present invention.

[0048] Figure 16 This is a structural diagram of the tube frame and liner removal according to the sixth embodiment of the present invention.

[0049] In the diagram, 1. Cup holder; 1a. Joint 1; 1a1. Guide edge; 1a2. Overlapping surface; 1a3. Deepest concave point 1; 1a4. Deepest convex point 1; 1b. Annular step 1; 2. Cup holder; 2a. Joint 2; 2a1. Butt joint edge; 2a2. Deepest concave point 2; 2a3. Deepest convex point 2; 2b. Support part; 2c. Flanged edge; 2d. Annular convex ridge; 2e. Limiting block; 3. Locking seat; 4. Locking block; 4a. Locking pin; 5. Locking ring; 6. Cylinder frame; 6a. Overlap plate; 6b. Annular step 2; 7. Lining; 8. Cup lid. Detailed Implementation

[0050] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0051] like Figures 1 to 16As shown, this split-type outer cup includes a cup base 1 and a cup holder 2. A locking structure is provided at the lid opening of the cup holder 2. This locking structure can be a structural feature inherent to the lid opening of the cup holder 2, or it can be an additional component. The locking structure is used to combine with the cup lid 8 to form a locking assembly. The cup holder 2 and the cup base 1 are spliced ​​together by a mating structure. This mating structure includes a mechanical feature one at the splicing interface 1a of the cup base 1 and a mechanical feature two at the splicing interface 2a of the cup holder 2. Mechanical feature one and mechanical feature two are axially aligned, and the cup base 1 provides axial and radial positioning for the cup holder 2. When the cup base 1 is placed on the supporting working surface and the cup holder 2 is placed on the cup base 1, i.e., the cup base 1 is below and the cup holder 2 is above, this is the upright position. In this position, the top opening of the cup base 1 facing the cup holder 2 is splicing interface 1a, and the bottom opening of the cup holder 2 facing the cup base 1 is splicing interface 2a.

[0052] Preferred, such as Figure 3 , 4 As shown in Figures 9 and 13, mechanical feature one is that a mating platform is provided on the splicing interface 1a of the cup holder 1. The mating platform includes an inlet edge 1a1 with an inclined outer wall. The outer periphery of the inlet edge 1a1 surrounds the overlapping surface 1a2. The overlapping surface 1a2 is the annular surface of the splicing interface 1a of the cup holder 1, as shown in Figures 9 and 13. Figure 1 and 2 As shown, the annular surface can be a plane, such as... Figures 3 to 16 As shown, it can also be a wavy surface or other regularly patterned annular surface. For example... Figure 3 , 4 As shown in Figures 9 and 13, an inner protrusion guide edge 1a1 extends from the inner ring of the annular surface, and the extension direction of the guide edge 1a1 gradually moves away from the supporting bottom of the cup holder 1. The inner peripheral wall of the guide edge 1a1 can smoothly connect with the inner peripheral wall of the cup holder 1 to form a straight cylindrical wall. The outer peripheral wall of the guide edge 1a1 connects to the middle area of ​​the overlapping surface 1a2. The outer peripheral wall of the guide edge 1a1 gradually reduces its outer diameter from the connection position, forming a conical outer surface with a certain taper. Mechanical feature two is that a butt edge 2a1 is provided on the splicing interface 2a of the cup holder 2. The inner periphery of the butt edge 2a1 has an inclined inner wall. The inclined inner wall gradually reduces its inner diameter from the splicing interface 2a of the cup holder 2 upwards, forming a conical inner surface with a certain taper. The conical inner surface matches the conical outer surface, that is, the tapers of the two are consistent. The butt edge 2a1 is fastened to the outer periphery of the guide edge 1a1. The end edge of the butt edge 2a1 is placed on the overlapping surface 1a2 of the butt joint to form axial positioning, and the inclined inner wall fits against the inclined outer wall to form radial positioning. The dimensions of the overlapping surface 1a2, the guide edge 1a1, and the mating edge 2a1 are designed as matching parameters to achieve a proper fit between the cup holder 2 and the cup base 1. After assembly, the overlapping surface 1a2 of the cup base 1 provides axial support and positioning for the splicing interface 2a of the cup holder 2, while the guide edge 1a1 of the cup base 1 extends into the inner circumference of the cup holder 2 for radial support and positioning, thus assembling the cup base 1 and the cup holder 2 into a complete cup body.

[0053] Preferred, such as Figures 3 to 16 As shown, mechanical feature one has a first shape, and mechanical feature two has a second shape; along the axis, the first shape has at least one concave point 1a3 and at least one convex point 1a4, forming a transition segment one between the concave point 1a3 and the convex point 1a4; along the axis, the second shape has at least one concave point 2a2 and at least one convex point 2a3, forming a transition segment two between the concave point 2a2 and the convex point 2a3; the concave point 1a3 and the convex point 2a3 are joined together, the convex point 1a4 and the concave point 2a2 are joined together, and the transition segment one and the transition segment two are correspondingly joined together; the first shape is specifically the rim shape of the splicing interface 1a of the cup holder 1, that is, the rim is not a horizontal rim, but other edge shapes with varying heights. The second shape is specifically the rim shape of the splicing interface 2a of the cup holder 2, that is, the rim is not a horizontal rim, but other edge shapes with varying heights. The first and second shapes are arranged oppositely. When the second splicing interface 2a of the cup holder 2 aligns with the first splicing interface 1a of the cup base 1, the first and second shapes interlock in a corresponding manner, specifically with complementary concave and convex shapes. This makes the outer wall of the cup holder 2 and the cup base 1 form an integral structure, and the inner wall form an integral structure. The concave and convex interlocking structure forms a rotation restriction in the circumferential direction, realizing the circumferential positioning of the cup holder 2 and the cup base 1, thereby facilitating the hand to hold the cup and rotate the locking ring 5. The most prominent point 2a3 and its adjacent transition section 2 form the support part 2b. The support part 2b is the protruding part of the splicing interface 2a of the cup holder 2, specifically including the cup wall parts extending from the most prominent point 2a3 to both sides. There is no strict limitation on where the extension point ends. The position of the adjacent point of the support part 2b is related to the ratio of the cup body (inner liner 7) placed inside. Specifically, the ratio of the height of the cup wall of the cup holder 2 to the height of the inner liner 7 is in the range of 1:2 to 2:3. The support portion 2b of the cup holder 2 provides structural support to the outer wall of the soft inner liner 7, which helps maintain the stability of the inner liner 7 during shaking operations. The concave structure formed by the deepest point 2a2 and its two sides reduces the mass of the cup holder 2, thereby reducing fatigue caused by continuous operation of the handheld spray gun and extending the continuous working time.

[0054] Preferably, the first shape is a wave cycle (e.g.) Figures 3 to 5 ), two wave cycles (such as Figure 6 , 7 and 11 to 16) or multiple wave cycles (such as Figures 8 to 10 One wave cycle has one concave point -1a3 and one convex point -1a4; two wave cycles have two concave points -1a3 and two convex points -1a4; multiple wave cycles have multiple concave points -1a3 and multiple convex points -1a4; the second shape is one wave cycle (e.g. Figures 3 to 5 ), two wave cycles (such as Figure 6 , 7 and 11 to 16) or multiple wave cycles (such as Figures 8 to 10 One wave cycle has one concave point 2a2 and one convex point 2a3, two wave cycles have two concave points 2a2 and two convex points 2a3, and multiple wave cycles have multiple concave points 2a2 and multiple convex points 2a3.

[0055] A wave cycle consists of a crest and a trough. This wave cycle can be a curved wave (e.g., an ocean wave) or a straight wave (e.g., a square wave or a triangular wave). The crest is the most convex point, and the trough is the most concave point. Because the wave cycles are arranged along the circular opening, they form a continuous, regularly undulating ring structure. When the first shape has one wave cycle, the second shape also has one wave cycle; when the first shape has two wave cycles, the second shape also has two wave cycles; and so on, thus allowing the first and second shapes to correspond and fit together. With the same cup size, too many wave cycles will result in a shorter wave cycle length and less undulation between the crest and trough. Excessive undulation can lead to weakness due to the narrow width of the supporting part 2b.

[0056] The fewer wave cycles allow for greater undulation between wave crests and troughs, reducing the mass of the cup holder 2 through the trough areas while increasing support strength through the wider crest areas (support part 2b). The cup base 1 or cup holder 2 features perforations in a relatively large area of ​​the cup wall. These perforations reduce the material used in the cup base 1 or cup holder 2, thus reducing weight, without compromising the support strength of the cup wall.

[0057] like Figures 3 to 5 As shown, when the cup holder 1 or cup rack 2 has only one wave cycle, the first shape or the second shape forms an inclined structure that rises while falling, wherein the rising side of the second shape forms the support portion 2b. Figure 6 , 7 As shown in Figures 11 to 16, when the cup holder 1 or the cup rack 2 has two wave cycles, the first shape or the second shape forms two symmetrical protrusions with a recessed portion sandwiched between them, wherein the protrusion of the second shape is the support portion 2b.

[0058] Preferred, such as Figures 1 to 8As shown in Figure 10, the locking structure is a locking ring 5. A constraint area is set around the outer periphery of the cup holder 2. The locking ring 5 is placed within the constraint area, allowing for free circumferential rotation and axial movement. Specifically, the locking ring 5 is fitted within the constraint area on the outer periphery of the cup holder 2. The constraint area does not restrict the circumferential rotation of the locking ring 5. The width of the constraint area is greater than the width of the locking ring 5, thus allowing the locking ring 5 to reciprocate along the axis within the constraint area. A flange 2c is provided on the cap opening of the cup holder 2, and an annular protrusion 2d is provided on the outer wall of the cup holder 2. This annular protrusion 2d can be a complete circle around the outer periphery of the cup holder 2, or it can be a ring structure composed of multiple discontinuous arc segments. The annular protrusion 2d, the flange 2c, and the cup holder 2 are concentrically arranged. The outer wall of the cup holder 2 between the annular protrusion 2d and the flange 2c forms the aforementioned constraint area. The side of the annular protrusion 2d facing the flange 2c forms a limiting surface, and the side of the annular protrusion 2d facing away from the flange 2c forms a guide surface.

[0059] The guiding surface is a gently sloping surface that gradually rises from the outer wall of the cup holder 2. The locking ring 5 is guided into the constraint area along this gently sloping surface. The limiting surface is either a plane or a steep slope. After the locking ring 5 is placed in the constraint area, it is resisted by the limiting surface to prevent the locking ring 5 from disengaging. Several protruding ribs parallel to the axis are provided on the outer wall of the cup holder 2 in the constraint area. The inner ring of the locking ring 5 contacts the several protruding ribs, and the protruding ribs provide point support for the locking ring 5, thereby reducing the contact area between the locking ring 5 and the outer wall of the cup holder 2, which facilitates the circumferential free rotation and axial movement of the locking ring 5.

[0060] The inner circumference of the locking ring 5 is provided with several internal thread segments, such as... Figure 1 , 2 As shown in Figure 4, several limiting blocks 2e protrude from the outer ring of the flange 2c. The inner liner 7 is inserted into the cup holder 2, with the edge of the inner liner 7 overlapping the flange 2c. The cup lid 8 is then fastened onto the inner liner 7 and the cup holder 2. The locking ring 5 is moved axially so that the internal thread section of the locking ring 5 reaches above the external thread section of the cup lid 8. The locking ring 5 is rotated around the cup holder 2 so that the internal thread section of the locking ring 5 wedges with the external thread section of the cup lid 8 until the internal thread section of the locking ring 5 stops rotating against the limiting blocks 2e. Through the cooperation of the limiting blocks 2e and the internal thread section, the limit position of the rotation of the locking ring 5 is determined, avoiding the locking ring 5 from over-locking the cup lid 8 and causing it to disengage.

[0061] In another embodiment, such as Figure 1 and 2 As shown, a locking seat 3 protrudes from the outer wall of the cup holder 1, and a locking hole is opened on the locking seat 3. A locking block 4 protrudes from the outer wall of the cup holder 2, and a locking pin 4a is provided on the locking block 4. The cup holder 2 and the cup holder 1 are joined together axially and rotated circumferentially. The locking pin 4a is inserted into the locking hole along the rotation trajectory.

[0062] like Figure 1 and 2As shown, the splicing interface 1a of the cup holder 1 has an annular plane, and the splicing interface 2a of the cup holder 2 also has an annular plane. After the cup holder 2 and the cup holder 1 are axially spliced, the two annular planes fit together, and at the same time, a mating surface is formed between the locking seat 3 and the locking block 4. This mating surface is located at the same axial height. The locking hole is an arc-shaped hole, and the locking pin 4a is an arc-shaped rod. The radius of the arc-shaped hole and the arc-shaped rod are equal. Of course, the positions can also be reversed. The locking block 4 is set on the outer wall of the cup holder 1, and the locking seat 3 is set on the outer wall of the cup holder 2. When the cup holder 2 rotates clockwise relative to the cup holder 1, the locking pin 4a gradually extends into the locking hole to form circumferential limitation and axial locking; when the cup holder 2 rotates counterclockwise relative to the cup holder 1, the locking pin 4a gradually withdraws from the locking hole to form a separated state. By locking the locking pin 4a and locking the locking hole, the cup holder 2 cannot be directly lifted from the cup base 1 in the locked state, which improves the stability of the assembly of the cup holder 2 and the cup base 1 and facilitates the subsequent assembly of the inner liner 7 and the cup lid 8.

[0063] In another embodiment, such as Figure 11 and 12 As shown, the support base of the cup holder 1 is open, and an annular step 1b is provided on the outer periphery of the open. The annular step 1b includes an annular platform connecting to the outer edge of the open, and an annular vertical wall is erected on the outer periphery of the annular plane. The cross-section of the annular step 1b is L-shaped. Several internal thread segments are provided on the inner wall of the annular step 1b, and the internal threads are specifically provided on the annular vertical wall.

[0064] The cup holder 1 and cup support 2 are arranged in an inverted configuration, with the cup support 2 below and the cup holder 1 above. Specifically, the cup support 2 is flipped so that its cap contacts the bearing surface. The splicing interface 2a of mechanical feature two of the cup support 2 faces upward, while the splicing interface 1a of mechanical feature one of the cup holder 1 faces downward, allowing mechanical feature one to mate with mechanical feature two to form a joint. Thus, the opening of the cup holder 1 faces upward, forming the insertion port for the entire cup. The inner liner 7 is inserted through the opening of the cup holder 1, with its edge overlapping the annular platform of the annular step 1b. The cup lid 8 is then placed into the annular step 1b, ensuring that the external thread of the cup lid 8 is misaligned with the internal thread of the annular step 1b during insertion to avoid interference between the external and internal thread sections, which could hinder the axial fit during installation. Finally, the cup lid 8 is directionally screwed into the internal thread to form a wedge lock. Thus, the cup holder 1 is fixed to the inner liner 7, providing support for the flexible wall of the inner liner 7. The cup wall of the cup holder 1 can adopt a similar cup wall structure to that of the cup holder 2 to form a support part 2b.

[0065] In another embodiment, such as Figure 13 and 16As shown, a cylindrical frame 6 is placed on the inner periphery of the cup holder 2. A mounting plate 6a is provided on the outer wall of the cylindrical frame 6, overlapping the cap opening of the cup holder 2. An annular step 6b is provided inside the port of the cylindrical frame 6. The annular step 6b includes an annular platform connecting to the outer edge of the port, and an annular vertical wall is erected on the outer periphery of the annular plane. The cross-section of the annular step 6b is L-shaped. Several internal thread segments are provided on the inner wall of the annular step 6b, specifically on the annular vertical wall.

[0066] When the diameter of the inner liner 7 is much smaller than the diameter of the cup holder 2, meaning the smaller diameter inner liner 7 cannot overlap the cap opening of the cup holder 2, the cylindrical frame 6 is first placed inside the cup holder 2, forming a stable support through the mounting plate 6a. The mounting plate 6a is specifically a horizontally placed T-shaped plate, with the protruding edges of the two symmetrically arranged T-shaped plates confined to the outside of the flange 2c of the cup holder 2. By reducing the inner circumference diameter through the cylindrical frame 6, the smaller diameter inner liner 7 is then placed inside the cylindrical frame 6, so that the edge of the inner liner 7 overlaps the annular platform of the second annular step 6b. The cup cap 8 is then placed into the second annular step 6b. During placement, care is taken to misalign the external thread section of the cup cap 8 with the internal thread section of the second annular step 6b to avoid interference between the external and internal thread sections, which would hinder the axial fitting installation operation. Finally, the cup cap 8 is directionally screwed into the internal thread to form a wedge lock. Thus, the cylindrical frame 6 is fixed on the inner liner 7, providing support for the flexible wall of the inner liner 7. The support part 2b can be formed on the cylindrical wall of the cylindrical frame 6 by adopting a cup wall structure similar to that of the cup holder 2 and the cup base 1.

[0067] In another embodiment, a fluid supply cup includes an inner liner 7 and a cup lid 8, and also includes the aforementioned split outer cup. The inner liner 7 is placed in the cup base 1 and the cup holder 2. The cup lid 8 is fastened to the inner liner 7 and is in a sprayed state. A locking structure locks the cup holder 2, the inner liner 7 and the cup lid 8 to form an assembly fit, and detaches them from the cup base.

[0068] First, determine the model of the liner 7 and the cup lid 8, and then determine which locking structure the cup lid 8 is compatible with.

[0069] The first option is, as Figures 1 to 8 As shown in Figure 10, if the cup lid 8 and the locking ring 5 are compatible, place the cup base 1 below, the cup holder 2 on the cup base 1, overlap the inner liner 7 in the cup holder 2, and place the cup lid 8 on the inner liner 7. First, lift the locking ring 5 axially so that the internal thread section of the locking ring 5 reaches above the external thread section of the cup lid 8. Rotate the locking ring 5 around the cup holder 2 to wedge the internal thread section of the locking ring 5 with the external thread section of the cup lid 8. Finally, one side of the locking ring 5 is restricted to the cup holder 2 and cannot be separated. The other side of the locking ring 5 presses the cup lid 8 through the threaded engagement, clamping the edge of the inner liner 7 between the cup holder 2 and the cup lid 8. Thus, through the wedge locking of the locking ring 5 and the cup lid 8, the cup holder 2, the inner liner 7, the cup lid 8, and the locking ring 5 are assembled into a single structure.

[0070] like Figure 1As shown, the cup holder 2, inner liner 7, cup lid 8 and locking structure can be separated from the cup base 1. The splicing interface 2a of the cup holder 2 is a ring-shaped flat edge. The ratio of the cup wall height t of the cup holder 2 (the distance from the flange 2c to the splicing interface 2a) to the height T of the inner liner 7 is in the range of t:T=1:2 to 2:3.

[0071] like Figure 10 As shown, the cup holder 2, inner liner 7, cup lid 8 and locking structure can be separated from the cup base 1. The splicing interface 2a of the cup holder 2 is a ring-shaped multi-wave rim. The ratio of the cup wall height t of the cup holder 2 (the distance from the flange 2c to the most convex point 2a3) to the height T of the inner liner 7 is in the range of t:T=1:2 to 2:3.

[0072] The second option is, as Figure 11 and 12 As shown, if the cup lid 8 matches the annular step 1b of the cup holder 1, the cup holder 2 is placed upside down, the cup holder 1 is placed on the cup holder 2, the inner liner 7 is overlapped in the cup holder 1, and the cup lid 8 is placed on the inner liner 7. The cup lid 8 is screwed along the direction to screw the external thread into the internal thread to form a wedge-shaped lock, clamping the edge of the inner liner 7 between the cup holder 1 and the cup lid 8, thereby assembling the cup holder 1, inner liner 7, and cup lid 8 into a single structure. When the spray gun is installed for spraying, the cup wall of the cup holder 1 provides support for the inner liner 7 to swing left and right.

[0073] like Figure 11 and 12 As shown, the cup holder 1, inner liner 7, and cup lid 8 can be separated from the cup rack 2. The splicing interface 1a of the cup holder 1 is two wavy ring edges. The ratio of the cup wall height t of the cup holder 1 (the distance from the ring step 1b to the most convex point 1a4) to the height T of the inner liner 7 is in the range of t:T=1:2 to 2:3.

[0074] The third option is, such as Figure 13 and 16 As shown, if the diameters of the inner liner 7 and the cup lid 8 are much smaller than the diameters of the cup holder 2 and the cup base 1, and the cup lid 8 is compatible with the annular step 6b of the cylindrical frame 6, place the cup base 1 below, place the cup holder 2 on the cup base 1, overlap the cylindrical frame 6 inside the cup holder 2, then overlap the smaller diameter inner liner 7 in the cylindrical frame 6, and then place the cup lid 8 on the inner liner 7. Tighten the cup lid 8 in the directional direction to screw the external thread into the internal thread to form a wedge lock, clamping the edge of the inner liner 7 between the cylindrical frame 6 and the cup lid 8, thereby assembling the cylindrical frame 6, the inner liner 7, and the cup lid 8 into a single structure.

[0075] like Figure 16 As shown, the cylindrical frame 6, inner liner 7, and cup lid 8 can be separated from the cup base 1 and cup holder 2. The rim of the cylindrical frame 6 is a ring-shaped flat rim. The ratio of the cup wall height t of the cylindrical frame 6 to the height T of the inner liner 7 is in the range of t:T=1:2 to 2:3.

[0076] In another embodiment, a method of using a fluid supply cup is applied to the fluid supply cup as described above, wherein the cup holder 2, inner liner 7 and cup lid 8 assembled together are removed from the cup base 1, the liquid supply port of the cup lid 8 is connected to the liquid inlet of the spray gun, the inner liner 7 is in an inverted state, and the cup wall of the cup holder 2 supports the flexible wall of the inner liner 7.

[0077] After the supply cup and spray gun are installed, the inner liner 7 of the supply cup and the cup holder 2 form an angle relative to the vertical line, that is, the inner liner 7 is in an inverted state tilted backward towards the back of the gun. The center of gravity of the liquid in the inner liner 7 also shifts backward with the tilt. During the painting process, the operator holds the spray gun handle and swings it back and forth to perform spraying operations within a certain range. The liquid in the inner liner 7 also swings back and forth with the movement, causing the center of gravity of the liquid to sway from side to side, resulting in the instability of the entire spray gun. This can easily lead to operator hand fatigue and affect work efficiency and results.

[0078] The first option is, as Figure 1 and 2 As shown, when the splicing interface 2a of the cup holder 2 is an annular plane, that is, the cup wall height of the cup holder 2 is consistent, the cup wall of any area on the cup holder 2 can serve as the supporting part 2b of the inner liner 7. Specifically, taking the gun body as the reference, during the left and right shaking operation, the cup walls on the left and right sides of the cup holder 2 support the flexible wall of the inner liner 7 to prevent the center of gravity of the liquid from swaying left and right, causing the inner liner 7 to sway left and right. The stability of the inner liner 7 is improved through the rigid support of the cup wall.

[0079] The second option is, as Figures 3 to 5 As shown, when the splice interface 2a of the cup holder 2 completes one wave cycle, a wave crest region of one wave cycle serves as the support portion 2b. This wave crest region is located on the downward-sloping side of the liner 7 (i.e., the flexible wall region of the liner 7 facing the back of the gun). This wave crest region gradually extends from the back of the liner 7 to both sides, forming rigid support for the left and right sides of the liner 7 through the extended portions on both sides. Taking the gun body as a reference, during left and right swaying operations, the cup walls extending left and right of the cup holder 2 support the flexible wall of the liner 7, preventing the center of gravity of the liquid from swaying left and right, thus causing the liner 7 to sway left and right. The rigid support of the cup walls enhances the stability of the liner 7.

[0080] The third option is, such as Figures 6 to 7 As shown, when the splice interface 2a of the cup holder 2 has two wave cycles, the two wave crests of the two wave cycles are symmetrically arranged, and both wave crests form support parts 2b. Taking the gun body as a reference, the two wave crests are arranged one-to-one on the left and right sides of the inner liner 7, that is, the front and rear sides of the inner liner 7 correspond to the wave troughs. During the left and right swaying operation, the cup walls of the cup holder 2 on the left and right sides support the flexible walls of the inner liner 7, preventing the center of gravity of the liquid from swaying left and right and causing the inner liner 7 to sway left and right. The stability of the inner liner 7 is improved through the rigid support of the cup walls.

[0081] The fourth option is, such as Figures 8 to 10 As shown, when the splice interface 2a of the cup holder 2 has multiple wave cycles, due to the large number of wave cycles, the undulation of its crests and troughs is smaller, and the length of the waves is shorter, allowing multiple waves to be evenly arranged around the inner liner 7. Taking the gun body as a reference, during left-right swaying operations, several wave crests on the left and right sides of the cup holder 2 support the flexible wall of the inner liner 7, preventing the center of gravity of the liquid from swaying left and right, thus causing the inner liner 7 to sway left and right. The rigid support of the cup wall enhances the stability of the inner liner 7.

[0082] In summary, the height of the cup wall of the cup holder 2 as the supporting part 2b also affects the supporting effect on the inner liner 7. If the height of the supporting part 2b is too small, this area cannot reach the center of gravity of the liquid in the inner liner 7, and cannot provide stable support for the liquid swaying. If the height of the supporting part 2b is too large, this area exceeds the center of gravity of the liquid in the inner liner 7 by too much, increasing the weight of the cup holder 2 and raising the center of gravity of the supply cup, thereby increasing the burden of hand shaking operation, easily causing grip fatigue, and affecting the spraying state and duration. After a large number of calculations and experiments, it was verified that the ratio of the effective support height of the cup holder 2 supporting part 2b to the height of the inner liner 7 is in the range of 1:2 to 2:3.

[0083] The following descriptions are based on the assumption that the supply cup is mounted on the spray gun, according to the position of the spray gun body. Figure 1 and 2 As shown, when the splicing interface 2a of the cup holder 2 is an annular plane, the height of the cup wall with equal height around the perimeter is the effective support height. That is, the ratio of the cup wall height of the cup holder 2 to the height of the inner lining 7 is in the range of 1:2 to 2:3, where the height of the inner lining 7 is in the normal state, i.e., the uncollapsed state. Figures 3 to 5 As shown, when the splice joint 2a of the cup holder 2 is a wave cycle, the crest region of this wave cycle extends from the back of the inner lining 7 to the left and right sides, and the crest region extends to the middle position of the left and right sides, which is also approximately the middle position of this wave cycle. This middle position is the effective support height, and the ratio of the height of this middle position to the height of the inner lining 7 is in the range of 1:2 to 2:3. Figure 6 , 7 As shown, when the splicing interface 2a of the cup holder 2 has two wave cycles, the wave crest areas of the wave cycle are located on the left and right sides of the inner lining 7. The wave peak (highest point) is the effective support height, and the ratio of the wave peak of the cup wall to the height of the inner lining 7 is in the range of 1:2 to 2:3. Figures 8 to 10 As shown, when the splicing interface 2a of the cup holder 2 has multiple wave cycles, the left and right sides of the inner lining 7 correspond to multiple wave cycles. The peak value (highest point) of the wave cycle is the effective support height. The ratio of the peak value of the cup wall to the height of the inner lining 7 is in the range of 1:2 to 2:3.

[0084] There are two other combinations of the outer cup and inner lining 7, such as Figure 11 and 12 As shown, one method uses an inverted state to assemble the cup holder 1 with the inner liner 7, and the other method uses an internal state to assemble the tube frame 6 with the inner liner 7. Both methods use the same matching method between the support part 2b and the inner liner 7.

[0085] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or substitute them in a similar manner, without departing from the spirit of the invention or exceeding its defined scope. Although the invention has been detailed and described in the accompanying drawings and foregoing description, such descriptions are considered illustrative or exemplary rather than restrictive. It should be understood that changes and modifications can be made by those skilled in the art within the scope of the following claims. Specifically, the invention covers additional embodiments having any combination of features from the different embodiments described above. With regard to the use of the expressions “general” or “substantially,” this patent application should be understood to disclose that the disclosure equally fully satisfies these features and values, i.e., without any of the foregoing characterizations as “general” or “substantially.”

Claims

1. A detachable outer cup, comprising a cup base and a cup holder, wherein the cup holder has a locking structure at its cap opening, characterized in that, The cup holder and the cup base are joined together by a mating structure. The mating structure includes a mechanical feature one provided at one joint of the cup base and a mechanical feature two provided at another joint of the cup holder. The mechanical feature one and the mechanical feature two are axially connected, and the cup base provides axial and radial positioning for the cup holder.

2. The split outer cup as described in claim 1, characterized in that, The first mechanical feature is that a docking platform is provided on the splicing interface of the cup holder. The docking platform includes an inlet edge with an inclined outer wall. The outer periphery of the inlet edge surrounds the overlapping surface. The second mechanical feature is that a docking edge is provided on the splicing interface of the cup holder. The inner periphery of the docking edge has an inclined inner wall. The docking edge is fastened to the outer periphery of the inlet edge. The end edge of the docking edge is placed on the overlapping surface of the docking platform to form axial positioning. The inclined inner wall fits against the inclined outer wall to form radial positioning.

3. The split outer cup as described in claim 1 or 2, characterized in that, The first mechanical feature has a first shape, and the second mechanical feature has a second shape; the first shape along the axis has at least one concave point and at least one convex point, and a transition segment 1 is formed between the first concave point and the first convex point; the second shape along the axis has at least one concave point and at least one convex point, and a transition segment 2 is formed between the second concave point and the second convex point; the first concave point and the second convex point are joined together, the first convex point and the second concave point are joined together, and the first transition segment and the second transition segment are correspondingly joined together; the second convex point and its adjacent part of the second transition segment form a supporting part.

4. The split outer cup as described in claim 3, characterized in that, The first shape is one wave cycle, two wave cycles, or multiple wave cycles, wherein one wave cycle has one concave point 1 and one convex point 1, two wave cycles have two concave points 1 and two convex points 1, and multiple wave cycles have multiple concave points 1 and multiple convex points 1; the second shape is one wave cycle, two wave cycles, or multiple wave cycles, wherein one wave cycle has one concave point 2 and one convex point 2, two wave cycles have two concave points 2 and two convex points 2, and multiple wave cycles have multiple concave points 2 and multiple convex points 2.

5. The split outer cup as described in claim 1, characterized in that, A locking seat protrudes from the outer wall of the cup holder, and a locking hole is opened on the locking seat. A locking block protrudes from the outer wall of the cup holder, and a locking pin is provided on the locking block. The cup holder and the cup holder are joined together axially and rotated circumferentially. The locking pin is inserted into the locking hole along the rotation trajectory.

6. The split outer cup as described in claim 1 or 2, characterized in that, The locking structure is a locking ring, which forms a constraint area around the outer periphery of the cup holder. The locking ring is placed within the constraint area to allow for free circumferential rotation and axial movement. A flange is provided on the lid of the cup holder, and an annular protrusion is provided on the outer wall of the cup holder. The outer wall of the cup holder between the annular protrusion and the flange forms the aforementioned constraint area. The side of the annular protrusion facing the flange forms a limiting surface, and the side of the annular protrusion facing away from the flange forms a guiding surface.

7. The split outer cup as described in claim 1 or 2, characterized in that, The cup holder is designed to be open, and an annular step is provided on the outer periphery of the open. Several internal thread segments are provided on the inner wall of the annular step.

8. The split outer cup as described in claim 1 or 2, characterized in that, A cylindrical frame is placed inside the cup holder, and a mounting plate is provided on the outer wall of the cylindrical frame. The mounting plate overlaps the sealing opening of the cup holder. An annular step two is provided inside the port of the cylindrical frame, and several internal thread segments are provided on the inner wall of the annular step two.

9. A fluid supply cup, comprising an inner liner and a lid, characterized in that, It also includes a split outer cup as described in any one of claims 1 to 6, wherein the inner liner is placed in the cup base and cup holder, the cup lid is fastened to the inner liner and is in a sprayed state, and the locking structure locks the cup holder, inner liner and cup lid to form an assembly fit, and detaches them from the cup base.

10. A method of using a fluid supply cup, applied to the fluid supply cup as described in claim 9, characterized in that, Remove the assembled cup holder, liner, and lid from the cup base. Connect the liquid supply port of the lid to the liquid inlet of the spray gun. The liner is in an inverted state, and the cup wall of the cup holder supports the flexible wall of the liner.

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