CN111483697A

CN111483697A - Double-layer safety quantitative cover

Info

Publication number: CN111483697A
Application number: CN202010430179.XA
Authority: CN
Inventors: 章孝兵; 孙兴保
Original assignee: Ace Mold Shanghai Co Ltd
Current assignee: Ace Mold Shanghai Co Ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2020-08-04

Abstract

The invention discloses a double-layer safe quantitative cover, which comprises an inner cover and an outer cover sleeved outside the inner cover; the outer cover and the inner cover are movably connected, and the relative positions of the outer cover and the inner cover are adjustable; the opposite surfaces of the inner cover and the outer cover are respectively provided with concave-convex structures which are matched with each other; the concave-convex structure is in a sawtooth shape along the section outline of the cover rotating direction, the sawtooth-shaped section outline comprises an inclined plane and a vertical plane, and the inclined plane and the vertical plane are respectively the action surfaces of the concave-convex structure in the unscrewing direction and the screwing direction during rotation. The double-layer safety quantitative cover is simple and exquisite in design, plays a role in double insurance, can be opened only under specific conditions, is good in safety, can effectively avoid the situation that children accidentally open the double-layer safety quantitative cover, and is good in application prospect.

Description

Double-layer safety quantitative cover

Technical Field

The invention belongs to the technical field of packaging, and relates to a double-layer safety quantitative cover, in particular to a double-layer safety quantitative cover for a packaging bottle with an external flow guide groove.

Background

For liquid or semi-liquid daily consumption products or medical products such as laundry detergent, mouthwash, oral medicament, and the like, the liquid or semi-liquid daily consumption products or medical products are usually contained in containers such as bottles, so as to facilitate users to obtain a proper usage amount during use, and for users to pour out, such packaging bottles are mostly provided with external diversion trenches, and currently, a common practice in the market is to equip a measuring cup (an outer cover is a measuring cup) with a packaging bottle, wherein the measuring cup (the outer cover is a single-layer structure), and the outer cover is opened and closed by rotating or pulling. Although the outer cover can conveniently realize quantitative weighing, the use of the consumer products or medical products in the packaging bottle is strictly required, and the outer cover structure which can be conveniently opened is convenient for children to open to some extent, such as misuse or eating of the contents by children, which greatly threatens the life health of the children.

Therefore, the development of the safe quantitative cover structure capable of effectively preventing children from opening the cover by mistake is of great practical significance.

Disclosure of Invention

The invention aims to overcome the defect that the prior art can not prevent children from opening the cap by mistake, and provides a safe quantitative cap structure which can effectively prevent children from opening the cap by mistake.

In order to achieve the purpose, the invention provides the following technical scheme:

a double-layer safety quantitative cover comprises an inner cover and an outer cover sleeved outside the inner cover;

the outer cover and the inner cover are movably connected, and the relative positions of the outer cover and the inner cover are adjustable;

the opposite surfaces of the inner cover and the outer cover are respectively provided with concave-convex structures which are matched with each other;

the cross section profile of the concave-convex structure along the rotation direction of the cover is in a sawtooth shape, the sawtooth-shaped cross section profile comprises an inclined plane and a vertical plane, and the inclined plane and the vertical plane are respectively the action surfaces of the concave-convex structure in the unscrewing direction and the screwing direction during rotation;

when the double-layer safety quantitative cover needs to be closed, namely screwed, a certain acting force is applied in the vertical direction, then the outer cover is rotated, at the moment, the vertical surface is taken as an acting surface, the concave-convex structures of the inner cover and the outer cover are firmly clamped with each other, the outer cover can easily drive the inner cover to rotate to realize the closing of the safety quantitative cover, when the double-layer safety quantitative cover needs to be opened, namely screwed, the inclined surface is taken as the acting surface, compared with the vertical surface, the firm clamping of the concave-convex structures can be ensured only by applying a larger acting force in the vertical direction to complete the opening of the double-layer safety quantitative cover, when the double-layer safety quantitative cover is opened or closed, if the outer cover is rotated only by applying a torque of circumferential rotation, the outer cover and the inner cover cannot be meshed, the double-layer safety quantitative cover is always in a slipping state, and the situation that children, the double-layer safety quantitative cover has the advantages that two different experiences of screwing and unscrewing are given, the inner cover and the outer cover are matched to be vertical contact surfaces during screwing, the concave-convex structures of the inner cover and the outer cover can be firmly clamped by applying smaller vertical pressure, the matching surfaces of the inner cover and the outer cover are inclined planes during unscrewing, the vertical pressure to be applied for unscrewing the cover is larger if the included angle between the inclined plane and the horizontal direction is smaller according to the force decomposition principle, and if the force exceeds the limit of the application force of a child, the danger caused by the fact that the child unscrews the cover can be effectively avoided, so that the safety performance of the double-layer safety quantitative cover is improved, and the user can visually know whether the operation is screwing or unscrewing during use, and misoperation is avoided.

The double-layer safety quantitative cover has the advantages that the structural design is exquisite, the concave-convex structures on the inner cover and the outer cover are designed, the inner cover can be driven to rotate (open or close) only by clamping the concave-convex structures on the inner cover and the outer cover, meanwhile, the inner cover and the outer cover are movably connected, the relative positions of the inner cover and the outer cover can be adjusted, a user can drive the inner cover to rotate only by applying a certain acting force in the vertical direction to press the outer cover tightly, the concave-convex structures of the inner cover and the outer cover are tightly clamped with each other, in addition, the screwing-off acting surface and the screwing-off acting surface are different and are respectively an inclined surface and a vertical surface, so that the vertical acting force required by opening and closing is different, on one hand, the safety performance can be improved. The double-layer safety quantitative cover can be opened only under specific conditions (the outer cover is compressed by using proper vertical acting force and rotated), the safety can be obviously improved by using the double-layer safety quantitative cover, the situation that a child accidentally opens the double-layer safety quantitative cover is effectively avoided, and the double-layer safety quantitative cover has a great application prospect.

As a preferred technical scheme:

according to the double-layer safe quantitative cover, the outer wall of the inner cover close to the opening end is provided with the thread structure I matched with the thread structure II of the bottle mouth of the packaging bottle;

the inner wall of the inner cover is provided with scale marks for quantitatively weighing the contents in the packaging bottle, and a user can conveniently realize the quantitative weighing of the contents in the packaging bottle through the scale marks. The protection scope of the invention is not limited in this way, the thread structure I can also be arranged on the inner wall of the inner cover near the opening end, in addition, other connection forms besides the thread connection can also be adopted, and the components connected with the bottle mouth of the packaging bottle can be reasonably designed by the technical personnel in the field according to the actual requirements.

According to the double-layer safe quantitative cover, the outer wall of the inner cover is also provided with the outward protruding limiting ring;

the inner wall of the outer cover is provided with a groove I corresponding to the limiting ring, the width of the groove I is larger than that of the limiting ring, the outer cover and the inner cover can be movably connected through the groove I and the limiting ring, the relative position of the outer cover and the inner cover can be adjusted, the adjustable distance between the outer cover and the inner cover is larger than the vertical height of the sawtooth-shaped section profile inclined plane when the safety quantitative cover is completely unscrewed, and the outer cover and the inner cover can be continuously rotated relatively. The protection scope of the present invention is not limited thereto, and those skilled in the art can reasonably design the structure according to actual requirements to realize the movable connection between the outer cover and the inner cover and the relative position adjustment between the outer cover and the inner cover, and the connection structure only needs to realize the movable connection between the outer cover and the inner cover and the relative position adjustment between the outer cover and the inner cover.

The double-layer safety quantitative cover comprises a concave-convex structure and a convex structure, wherein the concave-convex structure is matched with the concave-convex structure and comprises a plurality of grooves II positioned on the outer wall of the inner cover and a plurality of bulges II positioned on the inner wall of the top surface of the outer cover;

the plurality of grooves II are circumferentially distributed on the outer wall of the inner cover, and the plurality of protrusions II are circumferentially distributed on the inner wall of the top surface of the outer cover;

a plurality of recess II end to end connection form continuous Z shape sawtooth profile, recess II's opening direction and inner cup opening direction are opposite and recess II part and the top surface parallel and level of inner cup. The specific structure of the protrusion II of the present invention is not limited thereto, and those skilled in the art can reasonably design the shape and structure of the protrusion II and the groove II according to actual requirements, as long as the groove II and the protrusion II can be mutually engaged and are not easy to be dislocated, and in addition, the specific positions of the protrusion II and the groove II on the inner cover and the outer cover are not limited thereto, which is only an example, and the groove II and the protrusion II can be exchanged between the inner cover and the outer cover, which is also applicable to the present invention.

According to the double-layer safe quantitative cover, the bulge II is of a triangular prism structure with the bottom surface being a right-angled triangle, one bottom surface of the bulge II is connected with the inner wall of the top surface of the outer cover, the plane where the inclined edges of the two bottom surfaces in the bulge II are located is an action surface in the unscrewing direction, and the gradient of the action surface can be set according to actual requirements;

the shape of the groove II is matched with that of the protrusion II, and the size of the groove II is larger than that of the protrusion II;

the inner cover and the outer cover are both cylindrical structures with only one open end, wherein the outer wall of the outer cover is provided with a plurality of axial anti-slip grooves to facilitate the rotation of the outer cover by a user;

the outer cover and the inner cover are both manufactured through an integral forming process, and are particularly manufactured through injection molding. The inner cover and the outer cover are manufactured through an integrated forming process, compared with a transmission structure with the inner cover and the outer cover arranged independently, on one hand, the number of parts can be reduced, so that the production cost is greatly reduced, on the other hand, the assembly difficulty is greatly reduced due to the reduction of the number of parts, the requirement on the processing precision of a product is greatly reduced, the application difficulty of the product is reduced, the inner cover and the outer cover can be manufactured through simple injection molding, and then the double-layer safety quantitative cover is obtained.

The double-layer safety quantitative cover comprises a concave-convex structure and a convex structure, wherein the concave-convex structure is matched with the concave-convex structure and comprises a plurality of grooves III positioned at the opening end of the side wall of the outer cover and a plurality of protrusions III positioned on the side wall of the inner cover;

the plurality of grooves III are circumferentially distributed on the side wall of the outer cover, and the plurality of protrusions III are circumferentially distributed on the side wall of the inner cover;

the opening direction of the groove III is the same as that of the outer cover, and the grooves III are connected end to form a continuous Z-shaped sawtooth-shaped outline. The specific structure of the protrusion III of the present invention is not limited thereto, and those skilled in the art can reasonably design the shapes and structures of the protrusion III and the groove III according to actual requirements, as long as the groove III and the protrusion III can be engaged with each other and are not easy to be dislocated, and in addition, the specific positions of the protrusion III and the groove III on the inner cover and the outer cover are not limited thereto, which is only an example, and the groove III and the protrusion III can be exchanged between the inner cover and the outer cover, which is also applicable to the present invention.

According to the double-layer safe quantitative cover, the bulge III is of a triangular prism structure with a right-angled triangle bottom surface, one bottom surface of the bulge III is connected with the side wall of the inner cover, the plane where the right-angled sides of the two bottom surfaces in the bulge III are located is connected with the inner cover, the plane where the inclined sides of the two bottom surfaces in the bulge III are located is an action surface in the unscrewing direction, and the gradient of the action surface can be set according to actual requirements;

the shape of the groove III is matched with that of the protrusion III, and the size of the groove III is larger than that of the protrusion III;

the inner cover is a cylindrical structure with only one end open;

the outer wall of the outer cover is provided with an inwards concave structure which is convenient for a user to hold, and the user can conveniently and effortlessly rotate the outer cover through the inwards concave structure;

the outer cover and the inner cover are both manufactured through an integral forming process, the outer cover is formed through injection, drawing and blowing, and the inner cover is formed through injection molding.

According to the double-layer safe quantitative cover, the outer wall of the inner cover is also provided with the outward protruding limiting ring, the limiting ring limits the lower half part of the outer cover within a certain range, and the movable connection between the outer cover and the inner cover and the relative position adjustability of the outer cover and the inner cover can be realized through the limiting ring.

The double-layer safety quantitative cover comprises a concave-convex structure and a convex structure, wherein the concave-convex structure is matched with the concave-convex structure and comprises a plurality of grooves IV positioned on the inner wall of the top surface of the outer cover and a plurality of bulges IV positioned on the outer wall of the top surface of the inner cover;

the plurality of grooves IV are circumferentially distributed on the inner wall of the top surface of the outer cover, and the plurality of protrusions IV are circumferentially distributed on the outer wall of the top surface of the inner cover;

the groove IV is formed by inwards sinking the top surface of the outer cover. The specific structure of the protrusion IV of the present invention is not limited thereto, and those skilled in the art can reasonably design the shape and structure of the protrusion IV and the groove IV according to actual requirements, as long as the groove IV and the protrusion IV can be engaged with each other and are not easy to be dislocated, and in addition, the specific positions of the protrusion IV and the groove IV on the inner cover and the outer cover are not limited thereto, which is only an example, and the groove IV and the protrusion IV can be exchanged between the inner cover and the outer cover, which is also applicable to the present invention.

According to the double-layer safe quantitative cover, the bulge IV is of a triangular prism structure with the bottom surface being a right-angled triangle, a plane where the right-angled sides of the two bottom surfaces of the bulge IV are located is connected with the top surface of the inner cover, a plane where the bevel sides of the two bottom surfaces in the bulge IV are located is an action surface in the unscrewing direction, and the gradient of the action surface can be set according to actual requirements;

the shape of the groove IV is matched with that of the protrusion IV, and the size of the groove IV is larger than that of the protrusion IV;

the inner cover is a cylindrical structure with only one end open;

the outer cover and the inner cover are both manufactured through an integral forming process, the outer cover is formed through injection, drawing and blowing, and the inner cover is formed through injection molding. Although the invention only provides three specific implementation forms, the specific structure is reasonably designed by the skilled in the art according to the actual requirements, and the design of the position limiting ring (single limiting ring or the limiting ring plus the groove I), the outer cover and the like can be flexibly selected by the skilled in the art according to the actual situation.

Has the advantages that:

(1) the double-layer safe quantitative cover is simple and exquisite in design, and due to the design of the concave-convex structures on the inner cover and the outer cover, the inner cover can be driven to rotate (open or close) only by clamping the concave-convex structures on the inner cover and the outer cover, and meanwhile, the inner cover and the outer cover are movably connected and the relative positions of the inner cover and the outer cover can be adjusted, so that a user can drive the inner cover to rotate only by applying a certain acting force in the vertical direction to press the outer cover tightly, so that the concave-convex structures of the inner cover and the;

(2) according to the double-layer safety quantitative cover, the unscrewing action surface and the screwing action surface are different and are respectively the inclined surface and the vertical surface, so that the vertical action force required by opening and closing is different, on one hand, the safety performance can be improved, on the other hand, a user can intuitively know whether the operation is screwing or unscrewing during use, and misoperation is avoided;

(3) the double-layer safety quantitative cover plays a role in double insurance, can be opened only under specific conditions (the outer cover is compressed by using proper vertical acting force and rotated), has good safety, effectively avoids the situation that children accidentally open the double-layer safety quantitative cover, and has great application prospect.

Drawings

Fig. 1, 2 and 3 are a perspective view, an exploded view and a front view, respectively, of the double-layered safety dosing cap of example 1;

FIG. 4 is a schematic cross-sectional view of FIG. 3A-A;

FIGS. 5, 6 and 7 are a schematic view, an exploded view and a front view, respectively, of the double-layered safety dosing cap of example 2;

FIG. 8 is a cross-sectional view of FIG. 7B-B;

FIG. 9 is a top view of the double layer safety dosing cap of example 2;

FIGS. 10, 11 and 12 are a perspective view, an exploded view and a front view, respectively, of the double-layered safety dosing cap of example 3;

FIG. 13 is a cross-sectional view of FIG. 12C-C;

FIG. 14 is a top view of the double layer safety dosing cap of example 3;

wherein, 1-outer cover, 2-antiskid groove, 3-inner cover, 4-groove II, 5-spacing ring, 6-thread structure I, 7-groove I, 8-protrusion III, 9-groove III, 10-concave structure, 11-protrusion IV, 12-groove IV.

Detailed Description

The following further describes the embodiments of the present invention with reference to the attached drawings.

Example 1

A double-layer safety quantitative cover is shown in figures 1-4 and comprises an inner cover 3 and an outer cover 1 sleeved outside the inner cover 3;

the inner cover 3 and the outer cover 1 are similar in integral structure and are of a cylindrical structure with only one end open;

the outer wall of the outer cover 1 is provided with a plurality of axial anti-slip grooves 2, and the inner wall of the outer cover 1 is provided with a groove I7;

the outer wall of the inner cap 3 is also provided with a convex limiting ring 5 matched with the groove I7 (the width of the groove I7 is larger than that of the limiting ring 5), the movable connection between the outer cap 1 and the inner cap 3 and the relative position adjustability of the outer cap and the inner cap can be realized through the groove I7 and the limiting ring 5 (the adjustable distance between the outer cap and the inner cap is larger than the vertical height of the sawtooth-shaped cross-section profile inclined plane when the safe quantitative cap is completely unscrewed), the outer wall of the inner cap 3 close to the opening end is provided with a thread structure I6 matched with the thread structure II of the bottle mouth of the packaging bottle, and the inner wall of the inner cap 3 is;

the outer wall of the inner cover 3 is provided with a plurality of grooves II 4, the plurality of grooves II 4 are circumferentially distributed on the outer wall of the inner cover 3, the inner wall of the top surface of the outer cover 1 is provided with a plurality of protrusions II which are in concave-convex fit with the grooves II 4, the plurality of protrusions II are circumferentially distributed on the inner wall of the top surface of the outer cover, the protrusions II are triangular prism structures with bottom surfaces being right-angled triangles, one bottom surface of each protrusion II is connected with the inner wall of the top surface of the outer cover, the plane where the hypotenuses of the two bottom surfaces in the protrusions II are located is an action surface in the unscrewing direction, the plurality of grooves II 4 are connected end to form a continuous Z-shaped sawtooth profile, the opening direction of the groove II 4 is opposite to the opening direction of the inner cover 3, the part of the groove II 4 is flush with the top surface of the inner cover 3, the shape of the groove II 4 is matched with the protrusions II, the sawtooth-shaped section profile comprises an inclined plane and a vertical plane, wherein the inclined plane and the vertical plane are respectively the action surfaces of the concave-convex structure (the groove II 4 and the protrusion II) in the unscrewing direction and the screwing direction during rotation;

the inner cover 3 and the outer cover 1 are both obtained by injection molding;

when closing double-deck safe ration lid, need exert certain effort in the vertical direction and rotate enclosing cover 1 again, the perpendicular face is as the working face this moment, the concave convex structure of inner cup 3 and enclosing cover 1 block each other firmly, enclosing cover 1 can easily drive the inner cup and take place rotatory realization safe ration lid and close, when opening double-deck safe ration lid, the inclined plane is as the working face, compare in the perpendicular face, need exert bigger effort on the vertical direction and just can guarantee concave convex structure's firm block each other, accomplish opening of double-deck safe ration lid.

Through verification, the double-layer safety quantitative cover is simple and exquisite in design, and due to the design of the concave-convex structures on the inner cover and the outer cover, the inner cover can be driven to rotate (open or close) only by clamping the concave-convex structures on the inner cover and the outer cover, the inner cover and the outer cover are movably connected, the relative positions of the inner cover and the outer cover can be adjusted, and a user can drive the inner cover to rotate only by applying a certain acting force in the vertical direction to press the outer cover tightly, so that the concave-convex structures of the inner cover and the outer cover are tightly; the unscrewing action surface and the screwing action surface are different and are respectively an inclined surface and a vertical surface, so that the vertical acting force required by opening and closing is different, on one hand, the safety performance can be improved, on the other hand, a user can intuitively know whether the operation is screwing or unscrewing when using the electric tool, and misoperation is avoided; the double-layer safety quantitative cover has the advantages of playing a role of double safety, being opened only under specific conditions (the outer cover is compressed by using proper vertical acting force and rotated), having good safety, effectively avoiding the situation that children accidentally open the double-layer safety quantitative cover, and having great application prospect.

Example 2

A double-layer safety quantitative cover is shown in figures 5-9 and comprises an inner cover 3 and an outer cover 1 sleeved outside the inner cover 3;

the outer wall of the outer cover 1 is provided with a concave structure 10 which is convenient for a user to hold, and the inner wall of the outer cover is provided with a groove I7;

the inner cover 3 is of a cylindrical structure with an opening at only one end, the outer wall of the inner cover is also provided with a convex limiting ring 5 matched with the groove I7 (the width of the groove I7 is larger than that of the limiting ring 5), the movable connection between the outer cover 1 and the inner cover 3 and the relative position adjustment between the outer cover and the inner cover can be realized through the groove I7 and the limiting ring 5, the inner wall of the inner cover is provided with scale marks for quantitatively weighing the contents in the packaging bottle, and the outer wall of the inner cover 3 close to the opening end is provided with a thread structure I6 matched with the thread structure II of the bottle mouth;

the opening end of the side wall of the outer cover 1 is provided with a plurality of grooves III9, the plurality of grooves III9 are circumferentially distributed on the side wall of the outer cover 1, the side wall of the inner cover 3 is provided with a plurality of protrusions III 8 which are in concave-convex fit with the grooves III9 (the plurality of protrusions III 8 are circumferentially distributed on the side wall of the inner cover 3), the opening direction of the grooves III9 is the same as that of the outer cover 1, the plurality of grooves III9 are connected end to form a continuous Z-shaped sawtooth-shaped profile, the protrusions III 8 are triangular prism structures with right-angled triangles on the bottom surfaces, one bottom surface of each protrusion III 8 is connected with the side wall of the inner cover 3, the planes where the right-angled sides of the two bottom surfaces in each protrusion III 8 are located are connected with the inner cover 3, the planes where the oblique sides of the two bottom surfaces in each protrusion III 8 are located are acting surfaces in the;

the outer cover 1 is obtained by injection stretch blow molding, and the inner cover 3 is obtained by injection molding;

Example 3

A double-layer safety quantitative cover is shown in figures 10-14 and comprises an inner cover 3 and an outer cover 1 sleeved outside the inner cover 3;

the inner cover 3 is a cylindrical structure with an opening at only one end, scale marks for quantitatively weighing the contents in the packaging bottle are arranged on the inner wall of the inner cover, a thread structure I6 matched with a thread structure II of the bottle mouth of the packaging bottle is arranged on the outer wall of the inner cover 3 close to the opening end, a convex limiting ring 5 is further arranged on the outer wall of the inner cover 3, the lower half part of the outer cover 1 shown in figure 13 is limited in a certain range by the limiting ring 5, and the movable connection between the outer cover 1 and the inner cover 3 and the relative position adjustment between the outer cover 1 and the inner cover 3 can be realized through;

the outer wall of the outer cover 1 is provided with a concave structure 10 convenient for a user to hold, the inner wall of the top surface of the outer cover 1 is provided with a plurality of grooves IV 12 distributed circumferentially, the outer wall of the top surface of the inner cover 3 is provided with a plurality of protrusions IV 11 which are in concave-convex fit with the grooves IV 12 (the plurality of protrusions IV 11 are distributed circumferentially on the outer wall of the top surface of the inner cover 3), the grooves IV 12 are formed by inwards sinking the top surface of the outer cover 1, the protrusions IV 11 are triangular prism structures with right-angled triangles on the bottom surfaces, a plane where the right-angled sides of the two bottom surfaces of the protrusions IV 11 are located is connected with the top surface of the inner cover 3, a plane where the bevel edges of the two bottom surfaces in the protrusions IV 11 are located is an action surface in the unscrewing direction, the;

Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these embodiments are merely illustrative and various changes or modifications may be made without departing from the principles and spirit of the invention.

Claims

1. A double-layer safe quantitative cover is characterized by comprising an inner cover and an outer cover sleeved outside the inner cover;

when closing double-deck safe ration lid, need exert certain effort in the vertical direction and rotate the enclosing cover again, the perpendicular face is as the working face this moment, the concave convex structure block of inner cup and enclosing cover is firm each other, the enclosing cover can easily drive the inner cup and take place to rotate and realize closing of safe ration lid, when opening double-deck safe ration lid, the inclined plane is as the working face, compare in the perpendicular face, need exert bigger effort on the vertical direction and just can guarantee concave convex structure's firm block each other, accomplish opening of double-deck safe ration lid.

2. The double-layer safe quantitative cover according to claim 1, wherein the outer wall of the inner cover near the opening end is provided with a thread structure I matched with a thread structure II of the bottle mouth of the packaging bottle;

and the inner wall of the inner cover is provided with scale marks for quantitatively weighing the contents in the packaging bottle.

3. The double-layer safety quantitative cover according to claim 1, wherein the outer wall of the inner cover is further provided with a convex limiting ring;

the inner wall of the outer cover is provided with a groove I corresponding to the limiting ring, the width of the groove I is larger than that of the limiting ring, the movable connection between the outer cover and the inner cover and the relative position between the outer cover and the inner cover can be adjusted through the groove I and the limiting ring, and the adjustable distance between the outer cover and the inner cover is larger than the vertical height of the sawtooth-shaped section profile inclined plane when the safety quantitative cover is completely unscrewed.

4. The double-layered safety quantitative cover according to claim 3, wherein the mating concavo-convex structure comprises a plurality of grooves II on the outer wall of the inner cover and a plurality of protrusions II on the inner wall of the top surface of the outer cover;

a plurality of recess II end to end connection form continuous Z shape sawtooth profile, recess II's opening direction and inner cup opening direction are opposite and recess II part and the top surface parallel and level of inner cup.

5. The double-layer safety quantitative cover according to claim 4, wherein the protrusion II is a triangular prism structure with a right-angled triangle bottom surface, one bottom surface of the protrusion II is connected with the inner wall of the top surface of the outer cover, and the plane where the inclined edges of the two bottom surfaces in the protrusion II are located is an action surface in the unscrewing direction;

the inner cover and the outer cover are both cylindrical structures with only one open end, wherein the outer wall of the outer cover is provided with a plurality of axial anti-slip grooves;

the outer cover and the inner cover are both manufactured through an integral forming process.

6. A double-layered safety dosing cap according to claim 3, wherein the co-operating relief structure comprises a plurality of grooves III at the open end of the side wall of the outer cap and a plurality of protrusions III at the side wall of the inner cap;

the opening direction of the groove III is the same as that of the outer cover, and the grooves III are connected end to form a continuous Z-shaped sawtooth-shaped outline.

7. The double-layer safety quantitative cover according to claim 6, wherein the protrusion III is a triangular prism structure with a right-angled triangle bottom surface, one bottom surface of the protrusion III is connected with the side wall of the inner cover, the plane where the right-angled sides of the two bottom surfaces in the protrusion III are located is connected with the inner cover, and the plane where the inclined sides of the two bottom surfaces in the protrusion III are located is an action surface in the unscrewing direction;

the inner cover is a cylindrical structure with only one end open;

the outer wall of the outer cover is provided with an inwards concave structure convenient for a user to hold;

8. The double-layer safety quantitative cover according to claim 3, wherein the outer wall of the inner cover is further provided with a convex limiting ring, the limiting ring limits the lower half part of the outer cover within a certain range, and the movable connection between the outer cover and the inner cover and the relative position adjustment between the outer cover and the inner cover can be realized through the limiting ring.

9. The double-layered safety quantitative cap of claim 8, wherein the mating concavo-convex structure comprises a plurality of grooves IV on the inner wall of the top surface of the outer cap and a plurality of protrusions IV on the outer wall of the top surface of the inner cap;

the groove IV is formed by inwards sinking the top surface of the outer cover.

10. The double-layer safety quantitative cover according to claim 9, wherein the protrusion IV is a triangular prism structure with a bottom surface of a right triangle, a plane where the right-angle sides of the two bottom surfaces of the protrusion IV are located is connected with the top surface of the inner cover, and a plane where the oblique sides of the two bottom surfaces of the protrusion IV are located is an action surface in the unscrewing direction;

the inner cover is a cylindrical structure with only one end open;