Powder scattering brush capable of preventing powder leakage

By designing plug-ins that can be inserted into powder outlet pipes in loose plastering to isolate the discharge port and powder outlet pipes, the problems of spilling and waste of loose powder are solved and the user experience is improved.

CN222217409UActive Publication Date: 2024-12-24ZHONGSHAN SHANGYANG PRECISION IND
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Patent Information

Application Number
CN202420339157.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-02-22
Publication Date
2024-12-24
Estimated Expiration
2034-02-22

AI Technical Summary

Technical Problem

During storage or transportation, existing loose plasters are prone to spilling and wasting of loose powder due to the connection between the discharge port and the powder discharge pipeline, which affects the user experience.

Method used

A loose plaster painting with leakage-proof powder is designed. By setting up a plug-in at the upper end of the powder can, the plug-in can be inserted into the powder outlet pipe and tightly matched with its inner wall as the powder can rise, insulating the discharge port and the powder outlet pipe. Avoid spilling and waste of loose powder.

Benefits of technology

Effectively prevent loose powder from spilling and wasting, improve the user experience, and is easy to operate.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a powder leakage prevention powder scattering brush which comprises a rod sleeve, the lower portion of the rod sleeve is movably connected with a powder tank capable of moving up and down relative to the rod sleeve, a powder storage bin is arranged in the powder tank, the upper portion of the powder tank is provided with a discharging port communicated with the powder storage bin, and the rod sleeve is provided with a brush head located above the powder tank. The brush head is provided with a powder outlet pipeline capable of being communicated with the discharging port and bristles arranged outside the powder outlet pipeline, an inserting piece extending upwards is arranged at the upper end of the powder tank, and the inserting piece can ascend along with the powder tank to be inserted into the powder outlet pipeline so as to isolate the powder outlet pipeline from the discharging port. When the powder scattering brush with the structure is stored or transported, the powder tank is pushed to move upwards relative to the rod sleeve, so that the inserting piece is inserted into the powder outlet pipeline and is in close fit with the inner wall of the powder outlet pipeline, loose powder discharged from the discharging port is prevented from passing through the powder outlet pipeline, the effect of isolating the discharging port from the powder outlet pipeline is achieved, and scattering and waste of the loose powder are avoided; and the use experience is improved, and the use operation is relatively simple and convenient.
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Description

Technical Field

[0001] The utility model relates to the technical field of cosmetics, in particular to a powder brush which prevents powder leakage. Background Art

[0002] In the makeup industry, loose powder brushes are a commonly used type of cosmetics. The loose powder particles attached to the bristles are transferred to the skin during the application process. The loose powder brush generally includes a brush head and a powder can. The powder can is used to store the loose powder to be used. The brush head is provided with a powder outlet pipe for outputting the loose powder and bristles arranged on the outside of the powder outlet pipe. The upper end of the powder can is provided with a discharge port connected to the powder outlet pipe.

[0003] When the powder brush is not in use, a cap is provided on the brush head to protect the bristles and prevent powder from falling. However, since the discharge port and the powder discharge pipe are always connected, when the powder brush is inverted or bumped, the powder will be discharged from the powder discharge pipe into the cap, resulting in a large amount of powder waste. After the cap is removed, the powder will also spill all over the floor, affecting the user experience. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a powder-leakage-proof loose powder brush, which can isolate the discharge port and the powder discharge pipe during storage or transportation, thereby preventing loose powder from spilling and wasting, and improving the user experience.

[0005] According to an embodiment of the utility model, a powder brush that prevents powder leakage comprises: a rod sleeve, the lower part of the rod sleeve is movably connected with a powder tank that can be lifted and lowered relative to the rod sleeve, a powder storage bin is provided in the powder tank, and a discharge port connected to the powder storage bin is provided on the upper part of the powder tank, the rod sleeve is provided with a brush head located above the powder tank, the brush head is provided with a powder discharge pipe that can be connected to the discharge port and bristles are provided on the outside of the powder discharge pipe, the upper end of the powder tank is provided with a plug-in component extending upward, the plug-in component can rise with the powder tank to be inserted into the powder discharge pipe and form a tight fit with the inner wall of the powder discharge pipe, thereby isolating the powder discharge pipe from the discharge port.

[0006] The powder brush for preventing powder leakage according to the embodiment of the utility model has at least the following features:

[0007] Beneficial effects:

[0008] When storing or transporting, the loose powder brush with the above structure pushes the powder tank to move upward relative to the rod sleeve so that the connector is inserted into the powder outlet pipe and fits tightly with the inner wall of the powder outlet pipe, thereby preventing the loose powder discharged from the discharge port from passing through the powder outlet pipe, isolating the discharge port and the powder outlet pipe to avoid spilling and wasting loose powder, thereby improving the user experience and being relatively easy to operate.

[0009] In some embodiments of the utility model, the upper part of the powder tank is provided with a circle of first sleeve extending upward, and the brush head is provided with a second sleeve connected to the lower end of the powder outlet pipe, the second sleeve and the first sleeve are mutually sleeved so as to be able to move up and down relative to each other, and there is always a telescopic channel between the second sleeve and the first sleeve for connecting the powder outlet pipe with the discharge port, and the connector is located inside the telescopic channel.

[0010] In some embodiments of the utility model, the connector includes a rod portion and a pin portion provided at the upper end of the rod portion, the cross-sectional area of ​​the pin portion gradually increases from top to bottom, and the diameter of the rod portion is greater than or equal to the inner diameter of the powder outlet pipe.

[0011] In some embodiments of the utility model, the axial directions of the rod portion, the ejector pin portion and the powder outlet pipe are collinear, a plurality of the outlets are provided, and the plurality of outlets are evenly distributed around the circumference of the rod portion.

[0012] In some embodiments of the utility model, the first sleeve is movably sleeved on the outer circumferential wall of the second sleeve, the first sleeve, the second sleeve and the powder outlet pipe are all cylindrical, and the diameters of the first sleeve, the second sleeve and the powder outlet pipe gradually decrease, and the outer circumferential wall of the second sleeve is protrudingly provided with a circle of annular sealing protrusions that can maintain contact with the inner circumferential wall of the first sleeve.

[0013] In some embodiments of the present invention, the brush head is detachably installed in the rod sleeve.

[0014] In some embodiments of the utility model, the inner circumferential wall of the rod sleeve is provided with an annular platform, the annular platform is connected to a guide sleeve extending downward to guide the powder can to slide up and down, the upper end of the guide sleeve is provided with an internal threaded hole, the lower end of the brush head is provided with a threaded column portion matching the internal threaded hole, and the threaded column portion is provided with a limiting portion that can lean downward against the annular platform.

[0015] In some embodiments of the utility model, the powder tank has a bottleneck, the internal channel of the bottleneck constitutes the upward opening of the powder storage bin, the bottleneck is threadedly connected with a screw cap, the connector and the discharge port are both provided on the screw cap, and the screw cap can be slidably provided on the rod sleeve.

[0016] In some embodiments of the utility model, the interior of the rod sleeve is telescopically provided with a middle bundle movably mounted on the outside of the brush head along its length direction, and the middle bundle is lifted and lowered relative to the brush head to gather or unfold the bristles, and the upper end of the rod sleeve is snap-connected to a cap body that accommodates the bristles, the brush head and the middle bundle.

[0017] In some embodiments of the utility model, the opposite side walls of the lower end of the middle bundle are respectively provided with a spring portion, the inner wall of the spring portion is provided with a positioning convex bump, and the outer peripheral walls of the upper and lower ends of the brush head are respectively provided with a first positioning groove and a second positioning groove for the positioning convex bump to enter and exit.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the powder brush of the utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the state when the connector is inserted into the powder outlet pipe and the middle bundle rises a certain distance relative to the brush head;

[0022] Figure 3 for Figure 1 A schematic diagram of the structural decomposition of an embodiment;

[0023] Figure 4 for Figure 3 A schematic diagram of the structure from another perspective.

[0024] Reference numerals:

[0025] Rod sleeve 100; annular platform 110; guide sleeve 120; internal threaded hole 121; powder tank 200; powder storage bin 201; discharge port 210; connector 220; rod portion 221; ejector portion 222; first sleeve 230; bottleneck portion 240; screw cap 250; brush head 300; powder discharge pipe 310; bristles 320; second sleeve 330; annular sealing protrusion 331; threaded column portion 340; limiting portion 341; first positioning groove 350; second positioning groove 360; middle beam 400; spring sheet portion 410; positioning convex bump 420; cap body 500. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", etc., are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] See also Figures 1 to 4 The utility model discloses a powder brush for preventing powder leakage, comprising: a rod sleeve 100, a powder tank 200 which is movably connected to the lower part of the rod sleeve 100 and can be lifted and lowered relative to the rod sleeve 100, a powder storage bin 201 is arranged in the powder tank 200, a discharge port 210 which is connected to the powder storage bin 201 is arranged on the upper part of the powder tank 200, the rod sleeve 100 is provided with a brush head 300 which is located above the powder tank 200, the brush head 300 is provided with a powder discharge pipe 310 which can be connected to the discharge port 210 and bristles 320 which are arranged on the outside of the powder discharge pipe 310, a plug-in component 220 which is extended upward is arranged on the upper end of the powder tank 200, the plug-in component 220 can rise with the powder tank 200 to be inserted into the powder discharge pipe 310 and form a tight fit with the inner wall of the powder discharge pipe 310, thereby isolating the powder discharge pipe 310 from the discharge port 210.

[0031] When storing or transporting the loose powder brush of the above structure, the powder tank 200 is pushed to move upward relative to the rod sleeve 100 so that the plug-in 220 is inserted into the powder outlet pipe 310 and tightly fits with the inner wall of the powder outlet pipe 310, thereby preventing the loose powder discharged from the discharge port 210 from passing through the powder outlet pipe 310, isolating the discharge port 210 and the powder outlet pipe 310 to avoid the loose powder from being scattered and wasted, improving the user experience, and the operation is relatively simple. When the loose powder brush is used normally, it is only necessary to drive the powder tank 200 to move downward relative to the rod sleeve 100 to pull the plug-in 220 out of the powder outlet pipe 310, and the discharge port 210 and the powder outlet pipe 310 are reconnected.

[0032] See also Figure 1 and Figure 2 In some embodiments of the present invention, the upper part of the powder tank 200 is provided with a circle of first sleeve 230 extending upward, and the brush head 300 is provided with a second sleeve 330 connected to the lower end of the powder outlet pipe 310. The second sleeve 330 and the first sleeve 230 are mutually sleeved to be able to move up and down relatively. There is always a telescopic channel between the second sleeve 330 and the first sleeve 230 to connect the powder outlet pipe 310 with the discharge port 210, and the plug-in 220 is located in the telescopic channel. It can be understood that the loose powder discharged from the discharge port 210 enters the telescopic channel. When the telescopic channel is connected to the powder outlet pipe 310, the loose powder can directly enter the powder outlet pipe 310. When the plug-in 220 blocks the powder outlet pipe 310, the loose powder in the telescopic channel will not leak. In the process of the powder tank 200 moving up and down relative to the brush head 300, although the length of the telescopic channel changes, it always has an independent cavity to ensure that the loose powder will not leak.

[0033] See also Figure 1 In some embodiments of the present invention, in order to facilitate the insertion or extraction of the plug-in 220 relative to the powder outlet pipe 310, the plug-in 220 includes a rod 221 and a pin 222 provided at the upper end of the rod 221. The cross-sectional area of ​​the pin 222 gradually increases from top to bottom, and the diameter of the rod 221 is greater than or equal to the inner diameter of the powder outlet pipe 310. It can be understood that when the powder tank 200 moves upward relative to the rod sleeve 100, the tip of the pin 222 moves upward along the lower end of the powder outlet pipe 310 until the pin 222 or the rod 221 is tightly matched with the inner circumferential wall of the powder outlet pipe 310, and the pin 222 also serves as a guide when the plug-in 220 is inserted into the powder outlet pipe 310.

[0034] See also Figure 1 and Figure 4In some embodiments of the present invention, the axial directions of the rod 221, the ejector 222 and the powder outlet pipe 310 are collinear, and a plurality of outlets 210 are provided, and the plurality of outlets 210 are evenly distributed around the circumference of the rod 221. It should be noted that the loose powder in the powder storage bin 201 is discharged from the plurality of outlets 210, which is conducive to forming a uniform flow of loose powder, and the loose powder moves along the outer circumference of the rod 221 toward the powder outlet pipe 310, thereby improving the fineness of the released loose powder.

[0035] See also Figure 1 and Figure 2 In some embodiments of the present invention, the first sleeve 230 is movably sleeved on the outer peripheral wall of the second sleeve 330, the first sleeve 230, the second sleeve 330 and the powder outlet pipe 310 are all cylindrical, and the diameters of the first sleeve 230, the second sleeve 330 and the powder outlet pipe 310 are gradually reduced, and the outer peripheral wall of the second sleeve 330 is protrudingly provided with a circle of annular sealing protrusions 331 that can keep contacting the inner peripheral wall of the first sleeve 230. It can be understood that the loose powder passes through the first sleeve 230, the second sleeve 330 and the powder outlet pipe 310 in sequence, and the diameters of the first sleeve 230, the second sleeve 330 and the powder outlet pipe 310 are gradually reduced, which is conducive to the smooth discharge of the loose powder from the powder outlet pipe 310, and the setting of the annular sealing protrusion 331 prevents the loose powder from leaking out from the matching gap between the first sleeve 230 and the second sleeve 330.

[0036] In some embodiments of the present invention, in order to facilitate the user to clean or replace the brush head 300 , the brush head 300 can be detachably installed in the rod sleeve 100 .

[0037] See also Figure 1 , Figure 2 and Figure 3 In some embodiments of the utility model, the inner circumferential wall of the rod sleeve 100 is provided with an annular platform 110, and the annular platform 110 is connected with a guide sleeve 120 extending downward to guide the powder tank 200 to slide up and down, and the upper end of the guide sleeve 120 is provided with an internal threaded hole 121, and the lower end of the brush head 300 is provided with a threaded column 340 matched with the internal threaded hole 121, and the threaded column 340 is provided with a limiter 341 that can be pressed against the annular platform 110 downward. When installing the brush head 300, the threaded column 340 is screwed into the internal threaded hole 121 until the limiter 341 is pressed against the annular platform 110, thereby limiting the height position of the brush head 300 in the rod sleeve 100. When the brush head 300 needs to be disassembled, the brush head 300 is screwed out in the opposite clockwise direction to achieve the cleaning and replacement of the brush head 300 and the bristles 320. The above structure is very convenient when installing and replacing the brush head 300, and the manufacturing cost is low. Of course, in other embodiments, the brush head 300 and the rod sleeve 100 may also be connected in a detachable manner such as a snap connection.

[0038] See also Figures 1 to 3 In some embodiments of the utility model, the powder tank 200 has a bottleneck 240, the internal channel of the bottleneck 240 constitutes the upward opening of the powder storage bin 201, the bottleneck 240 is threadedly connected with a rotary cover 250, the plug-in 220 and the discharge port 210 are both arranged on the rotary cover 250, and the rotary cover 250 can be slidably arranged on the rod sleeve 100. In this embodiment, the rotary cover 250 is slidably arranged in the above-mentioned guide sleeve 120, the inner wall of the guide sleeve 120 is provided with a vertical guide rib, the outer wall of the rotary cover 250 is provided with a vertical guide groove matched with the vertical guide rib, and the inner wall of the lower end of the guide sleeve 120 is also provided with a stop ring to prevent the rotary cover 250 from falling off downward, so that the rotary cover 250 can only slide up and down relative to the guide sleeve 120. Therefore, when the bottleneck 240 of the powder tank 200 is unscrewed from the rotary cover 250, the user can add loose powder to the powder storage bin 201.

[0039] See also Figure 1 and Figure 2 In some embodiments of the utility model, the rod sleeve 100 is provided with a middle bundle 400 that is movably mounted on the outside of the brush head 300 and is telescopically arranged inside the rod sleeve 100 along its length direction. The middle bundle 400 is lifted and moved relative to the brush head 300 to gather or unfold the bristles 320. The upper end of the rod sleeve 100 is buckled and connected with a cap body 500 that contains the bristles 320, the brush head 300 and the middle bundle 400. When in use, the cap body 500 is first removed, and the middle bundle 400 is slid downward, and the bristles 320 can be unfolded. When the powder brush needs to be stored, the middle bundle 400 is slid upward, the bristles 320 are gathered, and the cap body 500 can be sleeved on the outside of the bristles 320.

[0040] See also Figure 1 , Figure 2 and Figure 3 In some embodiments of the utility model, a spring sheet portion 410 is provided on the opposite side walls of the lower end of the middle bundle 400, and a positioning convex 420 is provided on the inner wall of the spring sheet portion 410. The outer peripheral walls of the upper and lower ends of the brush head 300 are provided with a first positioning groove 350 and a second positioning groove 360 ​​for the positioning convex 420 to enter and exit. It can be understood that when the positioning convex 420 and the first positioning groove 350 are elastically engaged, the middle bundle 400 extends upward to a certain height of the brush head 300, and the bristles 320 are gathered; when the positioning convex 420 and the second positioning groove 360 ​​are elastically engaged, the bristles 320 are divergent. Among them, notches are provided on both sides of the spring sheet portion 410 of the middle bundle 400, so that the spring sheet portion 410 can be elastically deformed roughly along the radial direction of the middle bundle 400, so as to enter and exit the first positioning groove 350 and the second positioning groove 360.

[0041] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A powder brush that prevents powder leakage, characterized in that: include: The rod sleeve (100) is provided with a powder tank (200) at the lower part of the rod sleeve (100) which can be lifted and lowered relative to the rod sleeve, a powder storage bin (201) is provided in the powder tank (200), a discharge port (210) which is connected to the powder storage bin (201) is provided at the upper part of the powder tank (200), and a brush head (300) which is located above the powder tank (200) and can be connected to the discharge port (210) is provided at the upper part of the rod sleeve (100). A powder outlet pipe (310) is connected to the powder outlet pipe (310) and bristles (320) are arranged on the outside of the powder outlet pipe (310), and the upper end of the powder tank (200) is provided with a plug-in component (220) extending upward, and the plug-in component (220) can rise with the powder tank (200) to be inserted into the powder outlet pipe (310) and form a tight fit with the inner wall of the powder outlet pipe (310), thereby isolating the powder outlet pipe (310) and the discharge port (210).

2. A powder brush for preventing powder leakage according to claim 1, characterized in that: The upper part of the powder tank (200) is provided with a circle of first sleeves (230) extending upward, and the brush head (300) is provided with a second sleeve (330) connected to the lower end of the powder outlet pipe (310), the second sleeve (330) and the first sleeve (230) are mutually sleeved so as to be able to move up and down relative to each other, and a telescopic channel connecting the powder outlet pipe (310) with the discharge port (210) is always provided between the second sleeve (330) and the first sleeve (230), and the plug-in component (220) is located in the telescopic channel.

3. A powder brush for preventing powder leakage according to claim 2, characterized in that: The plug-in component (220) comprises a rod portion (221) and a pin portion (222) disposed at the upper end of the rod portion (221); the cross-sectional area of ​​the pin portion (222) gradually increases from top to bottom; and the diameter of the rod portion (221) is greater than or equal to the inner diameter of the powder outlet pipe (310).

4. The powder-leakage-proof loose powder brush according to claim 3, characterized in that: The axial directions of the rod portion (221), the ejector pin portion (222) and the powder outlet pipe (310) are collinear, and a plurality of the outlet ports (210) are provided, and the plurality of outlet ports (210) are evenly distributed at circumferential intervals around the rod portion (221).

5. A powder brush for preventing powder leakage according to claim 3 or 4, characterized in that: The first sleeve (230) is movably sleeved on the outer peripheral wall of the second sleeve (330); the first sleeve (230), the second sleeve (330) and the powder outlet pipe (310) are all cylindrical, and the diameters of the first sleeve (230), the second sleeve (330) and the powder outlet pipe (310) gradually decrease; the outer peripheral wall of the second sleeve (330) is protrudingly provided with a circle of annular sealing protrusions (331) capable of maintaining contact with the inner peripheral wall of the first sleeve (230).

6. The powder brush for preventing powder leakage according to claim 1, characterized in that: The brush head (300) is detachably mounted inside the rod sleeve (100).

7. The powder-leakage-proof loose powder brush according to claim 6, characterized in that: The inner circumferential wall of the rod sleeve (100) is provided with an annular platform (110), and the annular platform (110) is connected to a guide sleeve (120) extending downward to guide the powder can (200) to slide up and down, and the upper end of the guide sleeve (120) is provided with an internal threaded hole (121), and the lower end of the brush head (300) is provided with a threaded column (340) matched with the internal threaded hole (121), and the threaded column (340) is provided with a limiting portion (341) capable of pressing downward against the annular platform (110).

8. The powder-leakage-proof loose powder brush according to claim 1, characterized in that: The powder tank (200) has a bottleneck (240), the internal channel of the bottleneck (240) constitutes the upward opening of the powder storage bin (201), the bottleneck (240) is threadedly connected with a screw cap (250), the connector (220) and the discharge port (210) are both arranged on the screw cap (250), and the screw cap (250) can be slidably arranged on the rod sleeve (100).

9. The powder-leakage-proof loose powder brush according to claim 1, characterized in that: The rod sleeve (100) is provided with a middle bundle (400) which is movably mounted on the outside of the brush head (300) and is telescopically arranged inside along its length direction. The middle bundle (400) is moved up and down relative to the brush head (300) to gather or unfold the bristles (320). The upper end of the rod sleeve (100) is buckled and connected to a cap body (500) which accommodates the bristles (320), the brush head (300) and the middle bundle (400).

10. The powder-leakage-proof loose powder brush according to claim 9, characterized in that: The two opposite side walls of the lower end of the middle bundle (400) are respectively provided with a spring piece portion (410), the inner wall of the spring piece portion (410) is provided with a positioning convex bump (420), and the outer peripheral walls of the upper and lower ends of the brush head (300) are respectively provided with a first positioning groove (350) and a second positioning groove (360) for the positioning convex bump (420) to enter and exit.