Vacuum feeder

Abstract

The invention relates to the field of pet feeding devices, and discloses a vacuum feeder which comprises a grain barrel with an inner cavity, an upper cover and a first annular sealing ring. An opening is formed in the top of the grain barrel, the first annular sealing ring surrounds the opening, and the upper cover presses the first annular sealing ring on the top of the grain barrel to seal the opening; the first annular sealing ring is of a hollow annular structure, a first annular protrusion is arranged on the annular face, used for bearing the first annular sealing ring, of the grain barrel, and the first annular protrusion faces the first annular sealing ring and surrounds the opening. According to the vacuum feeder, the gap between the upper cover and the grain barrel can be better sealed.

Description

Technical Field

[0001] The invention relates to the field of pet feeding devices, in particular to a vacuum feeder. Background Art

[0002] The vacuum feeder is a device that can evacuate the inner cavity of a grain barrel and automatically feed pets.

[0003] The current vacuum feeder includes a grain barrel and an upper cover, and the upper cover is installed on one side of the top of the grain barrel to seal the top opening of the grain barrel. The existing sealing upper cover has a structure in which a solid annular sealing ring is arranged between the upper cover and the grain barrel, and the upper cover squeezes the annular sealing ring, thereby deforming the annular sealing ring and sealing the gap between the upper cover and the grain barrel. However, due to the processing error of the upper cover and the grain barrel, the existing sealing structure requires the upper cover to apply a large pressure to the annular sealing ring to achieve a better sealing effect, but the large pressure is easy to cause the grain barrel or the upper cover to deform.

[0004] In view of this, it is necessary to design a vacuum feeder that can better seal the gap between the upper cover and the grain barrel.

[0005] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Summary of the invention

[0006] The invention provides a vacuum feeder which can better seal the gap between an upper cover and a grain barrel.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A vacuum feeder comprises a grain barrel with an inner cavity, an upper cover and a first annular sealing ring;

[0009] The top of the grain barrel is provided with an opening, the first annular sealing ring surrounds the opening, and the upper cover presses the first annular sealing ring on the top of the grain barrel to seal the opening;

[0010] The first annular sealing ring is a hollow annular structure, and a first annular protrusion is arranged on the annular surface of the grain barrel for supporting the first annular sealing ring, and the first annular protrusion faces the first annular sealing ring and surrounds the opening.

[0011] Optionally, the upper cover is provided with a first buckle portion;

[0012] On one side of the grain bucket, a second buckle member is provided corresponding to the first buckle portion. The second buckle member is slidably mounted on the grain bucket in the horizontal direction, and an elastic member for pushing the second buckle member to slide in a direction away from the inner cavity of the grain bucket is installed in the grain bucket;

[0013] The first buckle portion can press down the second buckle member, causing the second buckle member to slide in a direction close to the inner cavity of the grain bucket.

[0014] Optionally, the vacuum feeder further includes a base and a second annular sealing ring. The grain bucket is installed on the base;

[0015] The grain bucket extends out a vacuum extraction portion. The base is provided with a connection portion for docking with the vacuum extraction portion, and the vacuum extraction portion is provided with a vacuum extraction hole for communicating with the inner cavity of the grain bucket;

[0016] The second annular sealing ring is installed between the vacuum extraction portion and the connection portion, and the vacuum extraction portion presses the second annular sealing ring on the connection portion;

[0017] The second annular sealing ring surrounds the vacuum extraction hole, and the second annular sealing ring is a hollow annular structure. A second annular protrusion is provided on the connection portion. The second annular protrusion faces the second annular sealing ring and surrounds the vacuum extraction hole.

[0018] Optionally, when the first annular sealing ring is pressed by the upper cover on the first annular protrusion, the first annular sealing ring forms a concave structure surrounding the first annular protrusion.

[0019] Optionally, the vacuum feeder further includes a rotating shaft and a rotation driving device for driving the rotating shaft to rotate;

[0020] A rotating feeding tray is installed in the grain bucket. The rotating feeding tray is installed on the rotating shaft;

[0021] The rotating shaft is provided with a third annular protrusion, and a third annular sealing ring is sleeved on the third annular protrusion. The cross section of the third annular sealing ring is in a C shape, and the third annular sealing ring abuts against the grain bucket;

[0022] At least two sealing annular protrusions are provided on the third annular sealing ring for fitting the outer circumference of the grain bucket at intervals.

[0023] Optionally, the vacuum feeder further includes a vacuum extraction device for extracting vacuum from the inner cavity of the grain bucket;

[0024] The vacuum extraction device includes an air pump, a connecting pipe connecting the air pump, and a main control board electrically connected to the air pump;

[0025] The connecting pipe is connected to the vacuum hole.

[0026] Optionally, the upper cover includes a cover body and a clamping plate installed on one side of the bottom of the cover body, the clamping plate is provided with an annular clamping groove, and the first annular sealing ring is installed in the annular clamping groove.

[0027] Optionally, the cover body includes a plate body, a first plate portion and a second plate portion;

[0028] The first plate portion and the second plate portion are arranged in parallel with each other, and the pressing plate has a pressing portion located between the first plate portion and the second plate portion;

[0029] The second plate portion partially extends into the opening.

[0030] Optionally, the first buckle portion is arranged on the first plate portion.

[0031] Optionally, the upper cover is provided with a fourth annular protrusion, and the fourth annular protrusion is arranged opposite to the first annular protrusion.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The vacuum feeder provided by the present invention has a first annular sealing ring as a hollow annular structure, and a first annular protrusion is arranged on the annular surface of the grain barrel for supporting the first annular sealing ring, the first annular protrusion faces the first annular sealing ring and surrounds the opening, the upper cover presses down the first annular sealing ring, so that the first annular sealing ring is pressed on the first annular protrusion, the first annular sealing ring is a hollow structure, which is easier to deform and better fits the upper cover on the top and the first annular protrusion on the bottom respectively, thereby better sealing the gap between the upper cover and the grain barrel.

[0034] The present invention has other features and advantages, which will be apparent from or will be described in detail in the accompanying drawings and the following detailed description incorporated herein, which together serve to explain the specific principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 is a front view schematic diagram of a vacuum feeder provided by an embodiment of the present invention;

[0037] Figure 2 yes Figure 1 AA section structure diagram of the medium vacuum feeder;

[0038] Figure 3 yes Figure 2 Enlarged schematic diagram of the medium vacuum feeder at A1;

[0039] Figure 4 yes Figure 2 An enlarged schematic diagram of the medium vacuum feeder at A2;

[0040] Figure 5 is a schematic diagram of the installation of the vacuum feeder provided by an embodiment of the present invention under a hidden part structure;

[0041] Figure 6 yes Figure 5 Schematic diagram of CC cross-section structure of medium vacuum feeder;

[0042] Figure 7 yes Figure 6 A magnified schematic diagram of position B in the middle;

[0043] Figure 8 yes Figure 5 BB cross-sectional structure diagram of the medium vacuum feeder;

[0044] Fig. 9 yes Figure 6 A magnified schematic diagram of the middle C position;

[0045] Fig.10 It is a schematic diagram of the three-dimensional structure of the vacuum feeder provided by an embodiment of the present invention with the partial structure hidden.

[0046] Figure markings: 1. grain barrel; 101. first annular protrusion; 1011. fourth annular protrusion; 11. second snap-fit ​​member; 12. elastic member; 13. vacuum pumping part; 2. upper cover; 201. cover body; 2011. plate body; 2012. first plate part; 2013. second plate part; 202. clamping plate; 3. first annular sealing ring; 21. first snap-fit ​​part; 4. base; 401. vacuum pumping hole; 41. connecting part; 5. second annular sealing ring; 61. rotating shaft; 62. rotating drive device; 63. third annular sealing ring; 601. third annular protrusion; 602. sealing annular protrusion; 7. vacuum pumping device; 71. air pump; 72. connecting pipe; 71. air pump; 73. main control board. DETAILED DESCRIPTION

[0047] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0048] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0049] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0050] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0051] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0052] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0053] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0054] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0055] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] In view of the above-mentioned defects of the existing feeders, the applicant, based on many years of rich practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theory, actively conducts research and innovation in the hope of creating a technology that can solve the defects of the existing technology. After continuous research and design, and after repeated trial samples and improvements, the present invention with real practical value was finally created.

[0057] Please refer to Figures 1 to 10 An embodiment of the present invention provides a vacuum feeder, including a grain barrel 1, an upper cover 2 and a first annular sealing ring 3.

[0058] An opening is provided at the top of the grain barrel 1, a first annular sealing ring 3 surrounds the opening, and the upper cover 2 presses the first annular sealing ring 3 against the top of the grain barrel 1 to seal the opening; the first annular sealing ring 3 is a hollow annular structure, and a first annular protrusion 101 is provided on the annular surface of the grain barrel 1 for supporting the first annular sealing ring 3, and the first annular protrusion 101 faces the first annular sealing ring 3 and surrounds the opening.

[0059] The vacuum feeder in this embodiment is improved in that the first annular sealing ring 3 is a hollow annular structure, and a first annular protrusion 101 is provided on the annular surface of the grain barrel 1 for supporting the first annular sealing ring 3. Therefore, the upper cover 2 presses down the first annular sealing ring 3, so that the first annular sealing ring 3 is pressed on the first annular protrusion 101, and the first annular sealing ring 3 is deformed to better fit the upper cover 2 at the top and the first annular protrusion 101 at the bottom, respectively, so as to better seal the gap between the upper cover 2 and the grain barrel 1.

[0060] In this embodiment, by optimizing the sealing structure, the downward pressure of the upper cover 2 can be appropriately reduced, and the first annular sealing ring 3 can be well maintained to fit the upper cover 2 at the top and the first annular protrusion 101 at the bottom, respectively, so as to ensure sealing. In the vacuum feeder of this embodiment, the sealing effect between the grain barrel 1 and the upper cover 2 is better, and the upper cover 2 does not need to use excessive force to squeeze the first annular sealing ring 3, thereby effectively avoiding the deformation of the upper cover 2 or the grain barrel 1 due to excessive squeezing force.

[0061] Preferably, the first annular sealing ring 3 is a silicone ring, which has a better deformation effect.

[0062] Optionally, the upper cover 2 is provided with a first snap-fit ​​portion 21; a second snap-fit ​​component 11 is provided on one side of the grain barrel 1 corresponding to the first snap-fit ​​portion 21, the second snap-fit ​​component 11 can be slidably installed on the grain barrel 1 along a horizontal direction, and an elastic component 12 is installed in the grain barrel 1 for pushing the second snap-fit ​​component 11 to slide in a direction away from the inner cavity of the grain barrel 1; the first snap-fit ​​portion 21 can press down the second snap-fit ​​component 11, so that the second snap-fit ​​component 11 slides in a direction close to the inner cavity of the grain barrel 1.

[0063] Specifically, Figure 3 As shown, during the process of the first snapping portion 21 squeezing the second snapping member 11, the second snapping member 11 slides in a direction close to the inner cavity of the grain barrel 1 until the snapping portion of the first snapping portion 21 is lower than the snapping portion of the second snapping member 11. At this time, the second snapping member 11 slides along the action line of the elastic member 12 in a direction away from the inner cavity of the grain barrel 1, so that the first snapping portion 21 squeezes the second snapping member 11 and snaps with each other, thereby allowing the upper cover 2 to maintain the squeezing effect on the first annular sealing ring 3, so that the grain barrel 1 and the upper cover 2 maintain a sealing effect.

[0064] Optionally, the vacuum feeder further includes a base 4 and a second annular sealing ring 5, and the grain bucket 1 is installed on the base 4; the base 4 supports the grain bucket 1 to keep the grain bucket 1 storing pet food stable.

[0065] The grain bucket 1 extends out a vacuum extraction part 13, the base 4 is provided with a connection part 41 for docking with the vacuum extraction part 13, and the vacuum extraction part 13 is provided with a vacuum extraction hole 102 for communicating with the inner cavity of the grain bucket 1; the second annular sealing ring 5 is installed between the vacuum extraction part 13 and the connection part 41, and the vacuum extraction part 13 presses the second annular sealing ring 5 on the connection part 41; the second annular sealing ring 5 surrounds the vacuum extraction hole 102, and the second annular sealing ring 5 is a hollow annular structure, and the connection part 41 is provided with a second annular protrusion, and the second annular protrusion faces the second annular sealing ring 5 and surrounds the vacuum extraction hole 102.

[0066] In this embodiment, the setting of the second annular sealing ring 5 can effectively maintain a good sealing effect in the inner cavity of the grain bucket 1. The annular fit of the second annular sealing ring 5 and the second annular protrusion also makes the sealing effect between the vacuum extraction part 13 and the connection part 41 more stable.

[0067] Optionally, when the first annular sealing ring 3 is pressed by the upper cover 2 on the first annular protrusion 101, the first annular sealing ring 3 forms a concave structure surrounding the first annular protrusion 101. In this embodiment, the fitting area of the first annular sealing ring 3 and the first annular protrusion 101 can be effectively increased, so as to provide a better sealing effect.

[0068] Preferably, the upper cover 2 is provided with a fourth annular protrusion 1011, and the fourth annular protrusion 1011 is arranged opposite to the first annular protrusion 101. The cross section of the first annular sealing ring 3 is extruded into an 8-shaped or a shape with large ends and a narrow middle, so as to effectively improve the sealing effect.

[0069] Optionally, the vacuum feeder further includes a rotating shaft 61 and a rotation driving device 62 for driving the rotating shaft 61 to rotate; a rotating feeding tray is installed in the grain bucket 1, and the rotating feeding tray is installed on the rotating shaft 61; the rotating shaft 61 is provided with a third annular protrusion 601, and a third annular sealing ring 63 is sleeved on the third annular protrusion 601, the cross section of the third annular sealing ring 63 is in a U shape, and the third annular sealing ring 63 abuts against the grain bucket 1; at least two sealing annular protrusions 602 are arranged at intervals on the third annular sealing ring 63 for fitting the outer circumference of the grain bucket 1.

[0070] Specifically, the third annular sealing ring 63 seals the gap between the grain barrel 1 and the rotating shaft 61 to prevent air leakage. It should also be noted that the discharge port of the rotating discharge tray needs to be an openable and closable structure, and the discharge port can prevent gas from passing through when it is closed. Alternatively, a sealing plate is provided on one side of the bottom of the rotating discharge tray, and a sealing silicone strip is provided on the sealing plate, and the sealing silicone strip can effectively rotate the discharge port of the discharge tray; when the sealing plate is rotated to a suitable angle, the pet food on the sealing plate can fall onto the feeding bowl of the vacuum feeder.

[0071] Optionally, the vacuum feeder also includes a vacuum device 7 for evacuating the inner cavity of the grain barrel 1; the vacuum device 7 includes an air pump 71, a connecting pipe 72 connected to the air pump 71 and a main control board 73 electrically connected to the air pump 71; the connecting pipe 72 is connected to the vacuum hole 102.

[0072] Specifically, in this embodiment, at least two connecting pipes 72 are provided to match the vacuuming needs of the two inner chambers. In addition, a solenoid valve pressure relief port is also provided. In this embodiment, a five-way valve is also provided, and the connecting pipe 72 and the solenoid valve pressure relief port are respectively connected to the five-way valve, and the air pump 71 is connected to the five-way valve.

[0073] Optionally, the upper cover 2 includes a cover body 201 and a clamping plate 202 installed on one side of the bottom of the cover body 201 , the clamping plate 202 is provided with an annular clamping groove, and the first annular sealing ring 3 is installed in the annular clamping groove.

[0074] Optionally, the cover body 201 includes a plate body 2011, a first plate portion 2012 and a second plate portion 2013; the first plate portion 2012 and the second plate portion 2013 are arranged in parallel with each other, and the clamping plate 202 has a pressing portion located between the first plate portion 2012 and the second plate portion 2013; the second plate portion 2013 partially extends into the opening.

[0075] Specifically, the first plate portion 2012 and the second plate portion 2013 define the installation position of the pressing portion, so that the first annular sealing ring 3 can face the annular top structure of the grain barrel 1. In addition, the second plate portion 2013 partially extends into the opening, so that the pressing portion can press down the first annular sealing ring 3 more stably, reduce the pulling effect of the middle part of the second plate portion 2013 on the pressing portion, and better improve the sealing effect between the grain barrel 1 and the upper cover 2.

[0076] Optionally, the first buckle portion 21 is disposed on the first plate portion 2012 .

[0077] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A vacuum feeder, characterized in that: It includes a grain bucket (1) with an inner cavity, an upper cover (2) and a first annular sealing ring (3); The top of the grain bucket (1) is provided with an opening, the first annular sealing ring (3) surrounds the opening, and the upper cover (2) presses the first annular sealing ring (3) on the top of the grain bucket (1) to seal the opening; The first annular sealing ring (3) is a hollow annular structure, and a first annular protrusion (101) is provided on the annular surface of the grain bucket (1) for supporting the first annular sealing ring (3). The first annular protrusion (101) faces the first annular sealing ring (3) and surrounds the opening.

2. The vacuum feeder according to claim 1, characterized in that The upper cover (2) is provided with a first snap part (21); A second snap member (11) is provided on one side of the grain bucket (1) corresponding to the first snap part (21). The second snap member (11) is slidably mounted on the grain bucket (1) in the horizontal direction, and an elastic member (12) for pushing the second snap member (11) to slide in a direction away from the inner cavity of the grain bucket (1) is installed in the grain bucket (1); The first snap part (21) can press down the second snap member (11) to make the second snap member (11) slide in a direction close to the inner cavity of the grain bucket (1).

3. The vacuum feeder according to claim 1, characterized in that It further includes a base (4) and a second annular sealing ring (5), and the grain bucket (1) is installed on the base (4); The grain bucket (1) extends out a vacuum extraction part (13), the base (4) is provided with a connection part (41) for docking with the vacuum extraction part (13), and the vacuum extraction part (13) is provided with a vacuum extraction hole (102) for communicating with the inner cavity of the grain bucket (1); The second annular sealing ring (5) is installed between the vacuum extraction part (13) and the connection part (41), and the vacuum extraction part (13) presses the second annular sealing ring (5) on the connection part (41); The second annular sealing ring (5) surrounds the vacuum extraction hole (102), and the second annular sealing ring (5) is a hollow annular structure. A second annular protrusion is provided on the connection part (41). The second annular protrusion faces the second annular sealing ring (5) and surrounds the vacuum extraction hole (102).

4. The vacuum feeder according to claim 1, characterized in that When the first annular sealing ring (3) is pressed by the upper cover (2) on the first annular protrusion (101), the first annular sealing ring (3) forms a concave structure surrounding the first annular protrusion (101).

5. The vacuum feeder according to claim 1, characterized in that: It further includes a rotating shaft (61) and a rotation driving device (62) for driving the rotating shaft (61) to rotate; A rotating discharge tray is installed in the grain bucket (1), and the rotating discharge tray is installed on the rotating shaft (61); The rotating shaft (61) is provided with a third annular protrusion (601), and a third annular sealing ring (63) is sleeved on the third annular protrusion (601). The cross section of the third annular sealing ring (63) is in a C shape, and the third annular sealing ring (63) abuts against the grain bucket (1); The third annular sealing ring (63) is used to fit the outer circumference of the grain barrel (1) and is provided with at least two sealing annular protrusions (602) at intervals.

6. The vacuum feeder according to claim 3, characterized in that It also includes a vacuum extraction device (7) for evacuating the inner cavity of the grain barrel (1); The vacuum pump (7) comprises an air pump (71), a connecting pipe (72) connected to the air pump (71), and a main control board (73) electrically connected to the air pump (71); The connecting pipe (72) is connected to the vacuum hole (102).

7. The vacuum feeder according to claim 2, characterized in that The upper cover (2) comprises a cover body (201) and a clamping plate (202) installed on one side of the bottom of the cover body (201); the clamping plate (202) is provided with an annular clamping groove, and the first annular sealing ring (3) is installed in the annular clamping groove.

8. The vacuum feeder according to claim 7, characterized in that The cover body (201) comprises a plate body (2011), a first plate portion (2012) and a second plate portion (2013); The first plate portion (2012) and the second plate portion (2013) are arranged in parallel with each other, and the pressing plate (202) has a pressing portion located between the first plate portion (2012) and the second plate portion (2013); The second plate portion (2013) partially extends into the opening.

9. The vacuum feeder according to claim 8, characterized in that The first buckle portion (21) is arranged on the first plate portion (2012).

10. The vacuum feeder according to claim 1, characterized in that The upper cover (2) is provided with a fourth annular protrusion (1011), and the fourth annular protrusion (1011) is arranged opposite to the first annular protrusion (101).

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