Vacuum milk powder cover

Abstract

The utility model relates to the technical field of milk powder can accessories, and specifically to a vacuum milk powder cover, which includes a milk powder cover body, a vacuum one-way valve, an emptying pressure rod and a first spring. The milk powder cover is provided with an emptying hole; the middle part of the emptying pressure rod passes through the emptying hole and is slidably engaged with the milk powder cover body, and a clamping meson is provided at its upper end, and its lower end movably presses against the milk powder cover body and then movably seals the emptying hole; the first spring is sleeved with the emptying pressure rod, and its upper end presses against the clamping meson, and its lower end presses against the milk powder cover body; the vacuum one-way valve is arranged on the top of the milk powder cover body. The emptying pressure rod in the utility model normally seals the emptying hole under the action of the first spring and the clamping meson, and is installed on the milk powder cover body in a sliding and engaging manner, which overcomes the problem that the rubber cap in the prior art is easily lost due to accident.

Description

Technical Field

[0001] The utility model relates to the technical field of milk powder can accessories, and more specifically, to a vacuum milk powder cover. Background Art

[0002] After the milk powder can is opened for the first time, its sealing will be reduced, which will seriously affect the shelf life of the milk powder. During the period of the return of the south wind in southern China, the opened milk powder will even become damp and clump within a week, affecting the baby's drinking.

[0003] To this end, the patent document with announcement number CN217101298U provides a vacuum milk powder cover, which mainly extracts the gas inside the milk powder can through the cooperation of a rubber airbag, a second spring and two one-way valves, so that a vacuum sealing effect is formed inside the milk powder can, thereby extending the shelf life of the milk powder.

[0004] However, the rubber airbag in the above patent is actually a bellows-type airbag. After being pressed many times, it is easy to crack at the connection between the corrugations, which affects the vacuuming effect of the milk powder can. In addition, the rubber airbag is prone to non-vertical deformation during the pressing process (such as the compression amount on the left and right sides of the rubber airbag is inconsistent, resulting in one side being higher and the other side being lower). When the rubber airbag is pressed quickly, the hand feel is not good, which greatly affects the experience. In addition, the rubber plug plugged into the air inlet is easy to lose. Utility Model Content

[0005] Aiming at the problems in the prior art of vacuum milk powder cap that the rubber airbag is easy to crack, the pressing feel is not good and the rubber plug is easy to be lost, the purpose of the utility model is to provide a vacuum milk powder cap, which can overcome at least one of the above technical problems.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A vacuum milk powder cover comprises a milk powder cover body, a vacuum one-way valve, an emptying pressure rod and a first spring. The milk powder cover is provided with an emptying hole. The middle part of the emptying pressure rod passes through the emptying hole and is slidably engaged with the milk powder cover body, the upper end of the emptying pressure rod is provided with an engaging meson, and the lower end of the emptying pressure rod movably presses against the milk powder cover body to movably seal the emptying hole. The first spring is sleeved with the emptying pressure rod, the upper end of the emptying pressure rod presses against the engaging meson, and the lower end of the emptying pressure rod presses against the milk powder cover body; the vacuum one-way valve is arranged on the top of the milk powder cover body.

[0008] Optionally, it includes a first cylinder body, a second spring and a first sealing ring; a first cylinder head is provided on the top of the first cylinder body, a piston is slidably provided inside the first cylinder body to separate its internal space into a first normal pressure chamber and a second normal pressure chamber, and a first groove for accommodating the second spring is provided on the piston; the lower end of the second spring is pressed against the bottom of the first cylinder body, and the upper end of the second spring is pressed against the piston to push the piston against the first cylinder head; a second groove for accommodating the first sealing ring is provided on the outer wall of the piston, the inner ring of the first sealing ring is sleeved with the piston, and the outer ring of the first sealing ring is pressed against the first cylinder body; a second groove is provided on the outer wall of the piston, the inner ring of the first sealing ring is sleeved with the piston, and the outer ring of the first sealing ring is pressed against the first cylinder body; A third groove is provided for connecting the first normal pressure chamber with the second normal pressure chamber; a first air hole is provided at the bottom of the first cylinder body, a second cylinder body is provided at the bottom of the first cylinder body and outside the first air hole, a second cylinder head is provided at the top of the second cylinder body, and a second air hole is provided on the second cylinder head; the second normal pressure chamber is connected with the internal space of the milk powder can through the first air hole and the second air hole; a sealing gasket for movably blocking the first air hole is arranged inside the second cylinder body; a pressing rod penetrating the first cylinder head is provided in the middle of the piston; a third air hole is provided on the first cylinder head for connecting the first normal pressure chamber with the external environment.

[0009] Optionally, the upper surface of the first air hole forms a bell mouth which facilitates the sealing gasket to deform and movably seal the first air hole.

[0010] Optionally, an anti-sealing boss is provided on the lower surface of the second cylinder body for preventing the sealing gasket from blocking the second air hole.

[0011] Optionally, the middle height of the anti-sealing boss is greater than the peripheral height thereof.

[0012] Optionally, a pressing cap is provided on the pressing rod to facilitate pushing the piston to slide up and down.

[0013] Optionally, the pressing rod is provided with a limiting groove, and the pressing cap is provided with a limiting protrusion corresponding to the limiting groove, and the limiting protrusion is adapted to the limiting groove so that the pressing cap is rotatably connected to the pressing rod.

[0014] Optionally, a fourth groove for movably accommodating a pressing cap is provided on the first cylinder cover; when the pressing cap is located in the fourth groove, the pressing cap is fixed to the first cylinder cover by threaded engagement.

[0015] In summary, the utility model has the following beneficial effects: (1) A vacuum system is formed by the cooperation of the first cylinder body, the first cylinder cover, the piston, the first sealing ring, the second spring and the pressing rod, and then the gas in the milk powder can is extracted into the second normal pressure chamber through the vacuum system, and further a one-way valve is formed by the cooperation of the second cylinder body, the second cylinder cover, the sealing gasket and the first cylinder body to prevent the gas in the external environment from entering the interior of the milk powder can through the second normal pressure chamber, so that a vacuum sealing effect is formed inside the milk powder can, thereby extending the shelf life of the milk powder. (2) The first cylinder body is made of hard plastic of a certain thickness, and will not be damaged even if it is subjected to repeated sliding friction of the first sealing ring, thereby being able to maintain the vacuum effect for a long time. (3) During the pressing process, the pressing rod always slides in the vertical direction, so that it has a better pressing feel. (4) The emptying pressure rod normally seals the emptying hole under the action of the first spring and the clamping meson, and is installed on the milk powder cover body (i.e., the first cylinder body) in a sliding clamping manner, thereby overcoming the problem that the rubber cap in the patent CN217101298U is easily lost due to accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the utility model;

[0017] Figure 2 It is a partial structural schematic diagram of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the utility model;

[0019] Figure 4 It is a top view of the utility model;

[0020] Figure 5 The vacuum one-way valve in the utility model Figure 4 Sectional view at section AA;

[0021] Figure 6 It is an exploded view of the utility model.

[0022] In the figure: 1. first cylinder body; 11. first air hole; 111. bell mouth; 12. first normal pressure chamber; 13. second normal pressure chamber; 14. piston; 141. first groove; 142. second groove; 143. third groove; 144. pressing rod; 1441. limiting groove; 15. second cylinder body; 16. second cylinder head; 161. second air hole; 162. anti-sealing boss; 17. sealing gasket; 18. pressing cap; 181. limiting convex block; 182. snap-fit ​​groove; 2. second spring; 3. first sealing ring; 4. first cylinder head; 41. third air hole; 42. fourth groove; 43. fifth groove; 44. cover plate; 5. emptying pressure rod; 51. first spring; 52. third sealing ring; 53. snap-fit ​​meson; 6. connecting ring; 7. second sealing ring; 8. milk powder spoon; 81. snap-fit ​​block. DETAILED DESCRIPTION

[0023] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. Several embodiments of the utility model are given in the accompanying drawings. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0024] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection 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 utility model can be understood according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0025] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The terms "vertical", "horizontal", "left", "right", "above", "below" and similar expressions are for illustrative purposes only, 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.

[0026] The utility model is described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] The utility model provides a vacuum milk powder cover, such as Figure 1-6As shown, it includes a milk powder cover body, a vacuum one-way valve, an emptying pressure rod 5 and a first spring 51. The milk powder cover is provided with an emptying hole (not shown in the figure); the middle part of the emptying pressure rod 5 passes through the emptying hole and is slidably engaged with the milk powder cover body, and a locking meson 53 is provided at its upper end, and its lower end is movably pressed against the milk powder cover body to movably seal the emptying hole; the first spring 51 is sleeved with the emptying pressure rod 5, and its upper end is pressed against the locking meson 53, and its lower end is pressed against the milk powder cover body; the vacuum one-way valve is arranged on the top of the milk powder cover body.

[0028] Specifically, the milk powder cover body (i.e., the first cylinder body 1) is in an inverted T-shape, and an emptying hole is provided on its left side, and an emptying pressure rod 5 is movable to seal the emptying hole. The emptying pressure rod 5 runs through the first cylinder body 1 and the first cylinder cover 4, and the lower end of the emptying pressure rod 5 is an umbrella structure, and a third sealing ring 52 is sleeved on the outer wall, and a first spring 51 is sleeved in the middle, and a clamping meson 53 is provided at the upper end. Without external force, the emptying pressure rod 5 is in a normally closed state under the action of the first spring 51 and the clamping meson 53. When used to press the emptying pressure rod 5, the third sealing ring 52 no longer seals the emptying hole, and the internal space of the milk powder can is connected to the external environment through the emptying hole. The lower part of the first cylinder body 1 is integrally formed with a connecting ring 6 for sealing and fixing on the top of the milk powder can, and the connecting ring 6 is inlaid with a second sealing ring 7 for improving the sealing between the connecting ring 6 and the milk powder can. The right side of the connecting ring 6 is foldable with the right side of the first cylinder body 1, and its left side is buckled and connected with the left side of the first cylinder body 1. The first cover body 4 is provided with a fifth groove 43 for receiving the milk powder spoon 8, and a cover plate 44 is hingedly connected to the first cover body 4 for covering the fifth groove 43 to prevent the milk powder spoon 8 from falling. The milk powder spoon 8 is provided with a clamping block 81 for driving the pressing cap 18 to rotate, and the pressing cap 18 is provided with a clamping groove 182 adapted to the clamping block 81.

[0029] The emptying pressure rod 5 in the utility model normally seals the emptying hole under the action of the first spring 51 and the clamping meson 53, and is installed on the milk powder cover body (i.e. the first cylinder body 1) in a sliding clamping manner, thereby overcoming the problem that the rubber cap in the patent CN217101298U is easily lost due to accident.

[0030] Furthermore, the vacuum belt one-way valve comprises a first cylinder body 1, a second spring 2 and a first sealing ring 3; a first cylinder head 4 is arranged on the top of the first cylinder body 1, a piston 14 is slidably arranged inside the first cylinder body 1 to separate its internal space into a first normal pressure chamber 12 and a second normal pressure chamber 13, and a first groove 141 for accommodating the second spring 2 is provided on the piston 14; the lower end of the second spring 2 is pressed against the bottom of the first cylinder body 1, and the upper end thereof is pressed against the piston 14 to push the piston 14 against the first cylinder head 4; a second groove 142 is provided on the outer wall of the piston 14 for accommodating the first sealing ring 3, the inner ring of the first sealing ring 3 is sleeved with the piston 14, and the outer ring of the first sealing ring 3 is pressed against the first cylinder body 1; a second groove 142 is provided on the second groove A third groove 143 is used to connect the first normal pressure chamber 12 with the second normal pressure chamber 13; a first air hole 11 is provided at the bottom of the first cylinder body 1, a second cylinder body 15 is provided at the bottom of the first cylinder body 1 and outside the first air hole 11, a second cylinder head 16 is provided on the top of the second cylinder body 15, and a second air hole 161 is provided on the second cylinder head 16; the second normal pressure chamber 13 is connected with the internal space of the milk powder can through the first air hole 11 and the second air hole 161; a sealing gasket 17 for movably blocking the first air hole 11 is accommodated in the second cylinder body 15; a pressing rod 144 is provided in the middle of the piston 14 and passes through the first cylinder head 4; a third air hole 41 is provided on the first cylinder head 4 for connecting the first normal pressure chamber 12 with the external environment.

[0031] In this embodiment, the first cylinder body 1 is a plastic part with a cylindrical structure, and its upper part is fixedly connected to the first cylinder head 4 by existing methods such as thread, hot melt or glue bonding. The piston 14 slides up and down in the first cylinder body 1, and a pressing rod 144 is integrally formed on its top; a first annular groove 141 is provided on the inner side wall of the piston 14, and a second annular groove 14 is provided on the outer side wall, and the first sealing ring 3 is located in the second groove 14, which is convenient for improving the vacuum effect. The first air hole 11 is provided at the center of the bottom plate of the first cylinder body 1, and the second cylinder body 15 is a cylinder surrounded by the first air hole 11 and is integrally formed with the first cylinder body 1. The top of the second cylinder body 15 is fixedly connected to the second cylinder head 16 by existing methods such as snap-fit, hot melt or glue bonding, and the second air hole 161 is provided at the center of the second cylinder head 16. The sealing gasket 17 is circular, made of soft and easily deformable materials such as silicone, and is placed at the bottom of the second cylinder body 15 and directly above the first air hole 11. The number of the third groove 143 is at least one, and its function is to prevent the first normal pressure chamber 12 and the second normal pressure chamber 13 from being completely sealed by the first sealing ring 3; the third air hole 41 (see Figure 6 ) is opened on the first cylinder head 4 and the position can be set as required.

[0032] The utility model sets the first cylinder body 1 as the milk powder cover body in an integrally formed manner. In the absence of external force, the upper end of the second spring 2 pushes the piston 14 to press against the first cylinder cover 4; the vacuum extraction principle is as follows: ① the pressing rod 144 is pressed downward, the piston 14 slides downward, the volume of the first normal pressure chamber 12 increases, the volume of the second normal pressure chamber 13 decreases, the air pressure in the second normal pressure chamber 13 increases, and the sealing gasket 17 is deformed by force to block the first air hole 11, causing the compressed gas in the second normal pressure chamber 13 to enter the first normal pressure chamber 12 through the third groove 143, and then enter the external environment through the third air hole 41. ② Remove the external force, the second spring 2 recovers its elastic deformation, quickly pushes the piston 14 to slide upward, the volume of the second normal pressure chamber 13 increases and the internal air pressure decreases, the sealing gasket 17 no longer blocks the first air hole 11, so that part of the gas in the milk powder can enters the second normal pressure chamber 13 through the first air hole 11 and the second air hole 161, then enters the first normal pressure chamber 12 through the third groove 143, and then enters the external environment through the third air hole 41. Steps ① and ② are a vacuum cycle, which can only extract part of the gas in the milk powder can. Repeating the cycle 3-5 times can make the vacuum degree in the milk powder can meet the long-term moisture-proof sealing requirements.

[0033] It can be seen that the utility model first forms a vacuum system through the mutual cooperation of the first cylinder body 1, the first cylinder head 4, the piston 14, the first sealing ring 3, the second spring 2 and the pressing rod 144, and then extracts the gas in the milk powder can into the second normal pressure chamber 13 through the vacuum system, and further forms a one-way valve through the mutual cooperation of the second cylinder body 15, the second cylinder head 16, the sealing gasket 17 and the first cylinder body 1 to prevent the gas in the external environment from entering the interior of the milk powder can through the second normal pressure chamber 13, so that the interior of the milk powder can forms a vacuum sealing effect, thereby extending the shelf life of the milk powder. Secondly, the first cylinder body 1 is made of a certain thickness of hard plastic, and even if it is subjected to multiple sliding frictions of the first sealing ring 3, it will not be damaged, and can maintain the vacuum effect for a long time, thereby overcoming the problem that the rubber airbag in the CN217101298U patent is easy to crack and easy to deform in a non-vertical direction. In addition, during the pressing process, the pressing rod 144 always slides in the vertical direction, and has a better pressing feel compared with the rubber airbag.

[0034] Furthermore, a bell mouth 111 is formed on the upper surface of the first air hole 11 to facilitate the sealing gasket 17 to deform and flexibly seal the first air hole 11 .

[0035] like Figure 1 As shown, the bell mouth 111 is concave and communicates with the first air hole 11, which can facilitate the deformation of the sealing gasket 17 and thus obtain better sealing performance.

[0036] Furthermore, an anti-sealing boss 162 for preventing the sealing gasket 17 from blocking the second air hole 161 is provided on the lower surface of the second cylinder body 15 .

[0037] like Figure 1-2 As shown, the anti-sealing boss 162 is integrally formed with the second cylinder body 15, and can prevent the sealing gasket 17 from blocking the second air hole 161 during the upward sliding process of the piston 14. The anti-sealing boss 162 is composed of a plurality of protrusions, which are arranged around the second air hole 161. The shape of the protrusions can be a triangle, a trapezoid, a rectangle, etc., and in this embodiment, it is a right-angled trapezoid.

[0038] Furthermore, the middle height of the anti-sealing boss 162 is greater than the peripheral height thereof.

[0039] like Figure 1-2 As shown, the anti-sealing boss 162 is in the shape of a truncated cone as a whole, and its middle height is greater than its outer peripheral height, so as to prevent the sealing gasket 17 from adhering to the bottom of the anti-sealing boss 162 when the piston 14 slides upward.

[0040] Furthermore, a pressing cap 18 is provided on the pressing rod 144 to facilitate pushing the piston 14 to slide up and down.

[0041] like Figure 1-6 As shown, the pressing cap 18 is installed on the top of the pressing rod 144 by existing methods such as threading, snap-fitting, clamping, hot melting or gluing. It is T-shaped, which can increase the contact area with the hand and make it easier to push the piston 14 to slide up and down.

[0042] Furthermore, the pressing rod 144 is provided with a limiting groove 1441 , and the pressing cap 18 is provided with a limiting protrusion 181 corresponding to the limiting groove 1441 , and the limiting protrusion 181 is adapted to the limiting groove 1441 so that the pressing cap 18 is rotatably connected to the pressing rod 144 .

[0043] like Figure 1 As shown, under the action of the limiting groove 1441 and the limiting protrusion 181, the pressing cap 18 is rotatably clamped on the pressing rod 144.

[0044] Furthermore, a fourth groove 42 for movably accommodating the pressing cap 18 is formed on the first cylinder cover 4; when the pressing cap 18 is located in the fourth groove 42, the pressing cap 18 is fixed to the first cylinder cover 4 by threaded engagement.

[0045] like Figure 1 As shown, the pressing cap 18 is provided with a first thread, and the first cylinder head 4 is provided with a second thread adapted to the first thread. When the piston 14 moves to the bottom of the first cylinder body 1, the pressing cap 18 is located in the fourth groove 42. At this time, the pressing cap 18 can be fixed on the first cylinder head 4 by rotating it, preventing the pressing cap 18 from protruding from the top of the first cylinder head 4, which can improve the aesthetics on the one hand and prevent the pressing cap 18 from accidentally scratching the skin on the other hand.

[0046] The use process of this milk powder cover is as follows: ① tear off the original aluminum sealing film on the milk powder can, fix the connecting ring 6 on the top of the milk powder cover, lift the cover plate 44, take out the milk powder spoon 8, insert the clamping block 81 into the clamping groove 182 and rotate it 90 degrees counterclockwise (at this time, the piston 14 is at the highest position under the action of the second spring 2), repeatedly press and draw its pressing cap 18 to complete the vacuum process, and then press the pressing cap 18 into the fourth groove 42 and rotate it 90 degrees clockwise to lock the pressing cap 18 on the first cover body 4. ② When it is necessary to take milk powder, press the emptying pressure rod 5 to make the air pressure in the milk powder can equal the external environment pressure, flip the first cover body 4 to the right to open the milk powder cover to take milk powder, and after taking milk powder, repeat the above step ① to seal the milk powder can again.

[0047] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A vacuum milk powder cover, characterized in that: It includes a milk powder cover body, a vacuum one-way valve, an emptying pressure rod and a first spring. The milk powder cover is provided with an emptying hole. The middle part of the emptying pressure rod passes through the emptying hole and is slidably engaged with the milk powder cover body. The upper end of the emptying pressure rod is provided with a engaging meson, and the lower end of the emptying pressure rod movably presses against the milk powder cover body to movably seal the emptying hole. The first spring is sleeved with the emptying pressure rod, the upper end of which presses against the engaging meson, and the lower end of which presses against the milk powder cover body. The vacuum one-way valve is arranged on the top of the milk powder cover body.

2. The vacuum milk powder cover according to claim 1, characterized in that: The vacuum one-way valve comprises a first cylinder body, a second spring and a first sealing ring; a first cylinder cover is arranged on the top of the first cylinder body, a piston is slidably arranged inside the first cylinder body to separate its internal space into a first normal pressure chamber and a second normal pressure chamber, and a first groove for accommodating the second spring is provided on the piston; the lower end of the second spring is pressed against the bottom of the first cylinder body, and the upper end thereof is pressed against the piston to push the piston against the first cylinder cover; a second groove for accommodating the first sealing ring is provided on the outer wall of the piston, the inner ring of the first sealing ring is sleeved with the piston, and the outer ring of the first sealing ring is pressed against the first cylinder body; a first groove is provided on the second groove A third groove is provided for connecting the first normal pressure chamber with the second normal pressure chamber; a first air hole is provided at the bottom of the first cylinder body, a second cylinder body is provided at the bottom of the first cylinder body and outside the first air hole, a second cylinder head is provided at the top of the second cylinder body, and a second air hole is provided on the second cylinder head; the second normal pressure chamber is connected with the internal space of the milk powder can through the first air hole and the second air hole; a sealing gasket for movably blocking the first air hole is arranged inside the second cylinder body; a pressing rod penetrating the first cylinder head is provided in the middle of the piston; a third air hole is provided on the first cylinder head for connecting the first normal pressure chamber with the external environment.

3. The vacuum milk powder cover according to claim 2, characterized in that: The upper surface of the first air hole forms a bell mouth which is convenient for the sealing gasket to deform and movably seal the first air hole.

4. The vacuum milk powder cover according to claim 3, characterized in that: An anti-sealing boss for preventing the sealing gasket from blocking the second air hole is provided on the lower surface of the second cylinder body.

5. The vacuum milk powder cover according to claim 4, characterized in that: The middle height of the anti-sealing boss is greater than the peripheral height thereof.

6. The vacuum milk powder cover according to claim 2, characterized in that: The pressing rod is provided with a pressing cap which facilitates pushing the piston to slide up and down.

7. The vacuum milk powder cover according to claim 6, characterized in that: The pressing rod is provided with a limiting groove, and the pressing cap is provided with a limiting convex block corresponding to the limiting groove. The limiting convex block and the limiting groove are adapted to each other so that the pressing cap is rotatably connected with the pressing rod.

8. The vacuum milk powder cover according to claim 6, characterized in that: The first cylinder cover is provided with a fourth groove for movably accommodating a pressing cap; when the pressing cap is located in the fourth groove, the pressing cap is fixed to the first cylinder cover through threaded engagement.

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