External putting device

Abstract

The external throwing device comprises a shell and a door body arranged on an opening of the shell in a buckled mode, and the door body is rotationally connected with the shell through a hinge assembly; the hinge assembly comprises a shaft sleeve and a first mounting seat, hinge cantilevers protruding out of the surface are arranged on the first mounting seat at intervals, the extending ends of the two hinge cantilevers are connected with the two ends of a hinge shaft respectively, and the hinge shaft is coaxially sleeved with the shaft sleeve; the shaft sleeve is provided with a limiting rib extending towards the first installation base, and the extending end of the limiting rib abuts against the hinge cantilever. The hinge has the beneficial effects that the limiting structure is arranged on the shaft sleeve of the hinge, and when the door body is opened to the preset maximum opening degree, the limiting rib abuts against the first mounting base of the hinge, so that the door body and the shell are arranged at a certain distance all the time, collision between the door body and the shell is prevented, and the service life of the door body is prolonged. The appearance attractiveness of the external throwing device is reduced, or the overall structural strength is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of cleaning equipment, and more specifically, relates to an external dosing device. Background Art

[0002] With the continuous improvement of people's living standards, washing machines have not only been rapidly popularized in each family, but also shared washing machines have emerged in dormitories, apartments, and large accommodation factory areas. Users can obtain the right to use the shared washing machines by scanning codes or inserting coins, which brings convenience to users' laundry.

[0003] Currently, the functions of most washing machines are becoming increasingly rich, and an automatic dosing device for additives such as detergents, fabric softeners, and fabric conditioners is equipped inside the washing machine to improve the user experience; for shared washing machines, if each washing machine is equipped with an automatic dosing device, the cost of the washing machine will increase significantly. Therefore, an external dosing device independent of the washing machine has emerged, enabling the external dosing device to be matched with at least one washing machine. When replacing the washing machine or the external dosing device, the external dosing device or the washing machine does not need to be replaced in a matching manner, thereby reducing the operating cost of the shared washing machine.

[0004] Existing problems: During the process of replenishing additives or repairing the external dosing device, it is necessary to open the front door of the external dosing device. When opening the door with too much force; or when the arm, tool, etc. accidentally hits the door body, the door body will turn outwards excessively and collide with the housing of the external dosing device, resulting in scratches or even deformation of the outer surface of the door body or the housing, affecting the aesthetic appearance and overall structural strength of the external dosing device.

[0005] In view of this, the present invention is specifically proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide an external dosing device. By setting a limiting structure on the bushing of the hinge, when the door body is opened to a preset maximum opening degree, the limiting rib abuts against the first mounting seat of the hinge, thereby solving the problem that the door body will collide with the housing and affecting the structural strength of the external dosing device.

[0007] To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is: an external dosing device, including a housing and a door body buckled on the opening of the housing, the door body is rotatably connected to the housing through a hinge assembly; the hinge assembly includes a bushing and a first mounting seat, and hinge cantilevers protruding from the surface are arranged at intervals on the first mounting seat. The extending ends of the two hinge cantilevers are respectively connected to both ends of a hinge shaft, and the bushing is coaxially sleeved outside the hinge shaft; a limiting rib extending towards the first mounting seat is arranged on the bushing, and the extending end of the limiting rib abuts against the hinge cantilever.

[0008] Further, the limiting rib is a boss-type structure protruding from the outer peripheral surface of the bushing, and the end surface of the extending end of the boss-type limiting rib is in fitting contact with the first mounting seat.

[0009] Further, at least one side wall of the boss-type limiting rib is inclined inward from the bushing to the extending end.

[0010] Further, one side wall of the boss-type limiting rib is tangent to the outer peripheral surface of the bushing, and this side wall is perpendicular to the end surface of the extending end of the boss-type limiting rib.

[0011] Further, the first mounting seat includes a first mounting portion. One side of the first mounting portion is in fitting contact with the housing, and on the opposite side, a second mounting portion protruding from the surface is integrally formed. The fixed end of the hinge cantilever is connected to the extending end of the second mounting portion; the limiting rib abuts against the middle of the second mounting portion.

[0012] Further, a support post protruding from the surface is provided on the housing, and a support hole coaxially arranged with the support post is provided on the first mounting seat. The first mounting seat is sleeved on the support post through the support hole, and the hole wall of the support hole is in fitting contact with the support post.

[0013] Further, the axes of the bushing and the hinge shaft are respectively arranged vertically. An upward-opening positioning groove is provided on the upper surface of the hinge cantilever connected to the lower end of the hinge shaft; when the limiting rib is in abutting contact with the first mounting seat, part of the bushing is located in the positioning groove; when the limiting rib is not in contact with the first mounting seat, the lower end of the bushing is in fitting contact with the end surface of the top of the positioning groove.

[0014] Further, a positioning portion protruding downward is provided on the lower end surface of the bushing, and the positioning portion is detachably arranged in the positioning groove.

[0015] Further, the positioning portion is a quadrilateral boss structure. The two pairs of side walls of the boss-type positioning portion are respectively arc-shaped walls flush with the outer peripheral surface of the bushing, and the other two pairs of side walls are respectively in fitting contact with the groove walls of the positioning groove.

[0016] Further, the two side walls of the positioning groove are respectively arranged parallel to the same radial direction of the hinge shaft.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: By providing a limiting structure on the bushing of the hinge, when the door body is opened to the preset maximum opening degree, the limiting rib abuts against the first mounting seat of the hinge, so that the door body is always spaced apart from the housing by a certain distance, preventing the door body from colliding with the housing, resulting in a decrease in the aesthetic appearance of the external feeding device or a reduction in the overall structural strength.

[0018] At the same time, the structure of the present invention is simple, the effect is remarkable, and it is suitable for popularization and use.

[0019] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0020] As part of the present invention, the accompanying drawings are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0021] Figure 1 is a schematic structural diagram of the external delivery device according to an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of the hinge assembly when the door body is opened according to an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of the hinge assembly when the door body is opened according to an embodiment of the present invention;

[0024] Figure 4 is a schematic structural diagram of the first mounting seat and the hinge cantilever according to an embodiment of the present invention;

[0025] Figure 5 is a schematic structural diagram of the second mounting seat and the bushing according to an embodiment of the present invention.

[0026] In the figure: 1, housing; 110, support column; 2, door body; 3, hinge assembly; 310, first mounting seat; 311, first mounting portion; 312, second mounting portion; 313, support hole; 320, hinge cantilever; 321, hinge shaft; 322, positioning groove; 323, connecting portion; 330, second mounting seat; 340, bushing; 341, limiting rib; 342, positioning portion.

[0027] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Specific Embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] As Figures 1-5 shown, in the embodiment of the present invention, an external delivery device is introduced, which includes a housing 1 and a door body 2 fastened to the opening of the housing 1. The door body 2 is rotatably connected to the housing 1 via a hinge assembly 3; the hinge assembly 3 includes a bushing 340 and a first mounting seat 310. The first mounting seat 310 is provided with hinge cantilevers 320 protruding from the surface at intervals. The extending ends of the two hinge cantilevers 320 are respectively connected to both ends of a hinge shaft 321. The bushing 340 is coaxially sleeved outside the hinge shaft 321; the bushing 340 is provided with a limiting rib 341 extending towards the first mounting seat 310, and the extending end of the limiting rib 341 abuts against the hinge cantilever 320.

[0032] Through the above arrangement, by providing a limiting structure on the bushing 340 of the hinge, when the door body 2 is opened to a preset maximum opening degree, the limiting rib 341 abuts against the first mounting seat 310 of the hinge, so that the door body 2 is always spaced apart from the housing 1 by a certain distance, preventing the door body 2 from colliding with the housing 1, resulting in a decrease in the appearance beauty of the external delivery device or a reduction in the overall structural strength.

[0033] In the embodiment of the present invention, the limiting rib 341 is a boss-type structure protruding from the outer peripheral surface of the bushing 340. The end surface of the extending end of the boss-type limiting rib 341 is in close contact with the first mounting seat 310; by providing a plane on the limiting rib 341 that is in close contact with the first mounting seat 310, the contact area between the limiting rib 341 and the first mounting seat 310 is increased, the pressure between the two is reduced, and the stability of the limiting rib 341 in limiting the door body 2 is improved.

[0034] In an embodiment of the present invention, the end face of the extending end of the limiting rib 341 is a convex arc surface, and the axis of the arc surface is parallel to the axis of the hinge shaft; so that when the limiting rib 341 synchronously rotates with the door body 2, the end face of the extending end smoothly contacts the first mounting seat 310, preventing the outer peripheral edge of the extending end of the limiting rib 341 from rubbing against the first mounting seat 310, resulting in wear on the surface of the first mounting seat 310 and affecting the stability of the contact with the limiting rib 341.

[0035] In an embodiment of the present invention, at least one side wall of the boss-shaped limiting rib 341 is inclined inward from the bushing 340 to the extending end; by forming the inclined side wall, the cross-section of the limiting rib 341 near the bushing 340 is increased, improving the structural strength of the limiting rib 341.

[0036] In an embodiment of the present invention, the limiting rib 341 is a quadrilateral boss structure, and each side wall of the limiting rib 341 inclines inward from the bushing 340 to the extending end to further improve the structural strength of the limiting rib 341.

[0037] In an embodiment of the present invention, one side wall of the boss-shaped limiting rib 341 is tangent to the outer peripheral surface of the bushing 340, and this side wall is perpendicular to the end face of the extending end of the boss-shaped limiting rib 341.

[0038] In an embodiment of the present invention, the left or right side wall of the door body 2 and the housing 1 is hinged, the bushing 340 and the hinge shaft are coaxially arranged vertically, the boss-shaped limiting rib 341 extends horizontally, the upper and lower side walls of the limiting rib 341 are respectively arranged horizontally, and the other two side walls of the other two pairs of side walls are tangent to the outer peripheral surface of the bushing 340 on one side, and this side wall is perpendicular to the end face of the extending end of the boss-shaped limiting rib 341, and the opposite side wall inclines inward from the bushing 340 to the extending end; while ensuring that one side wall of the limiting rib 341 is in the same stress direction as the boss-shaped limiting rib 341, improving the bearing capacity of the limiting rib 341 for directional stress, the cross-sectional area of the limiting rib 341 near the bushing 340 is increased, further improving the structural strength of the limiting rib 341.

[0039] In an embodiment of the present invention, the vertical length of the limiting rib 341 is slightly less than the vertical length of the bushing 340, so as to ensure that each hinge cantilever is spaced from the upper and lower side walls of the limiting rib 341 by a certain distance, while making the limiting rib 341 have a longer vertical length, so as to maximize the fitting contact area between the limiting rib 341 and the first mounting seat 310, improve the structural strength of the limiting rib 341, and prevent the limiting rib 341 from deforming or even breaking.

[0040] In an embodiment of the present invention, a second mounting seat 330 is integrally formed on the bushing 340, and the second mounting seat 330 is connected to the door body 2.

[0041] In an embodiment of the present invention, the second mounting seat 330 is in a plate-like structure. One side plate surface of the plate-like second mounting seat 330 is in contact with the door body 2, and this side plate surface is tangent to the outer peripheral surface of the columnar bushing 340; so that the second mounting seat 330 is mounted on the door body 2 in a fitting manner, ensuring the stability of the installation of the bushing 340; at the same time, making the outer peripheral surface of the bushing 340 tangent to the second mounting seat 330, and making the bushing 340 protrude from the second mounting seat 330 in a direction away from the door body 2, thereby increasing the moving space of the door body 2 and also increasing the structural strength at the connection between the second mounting seat 330 and the bushing 340.

[0042] In an embodiment of the present invention, the door body 2 includes a door panel and a door frame extending from the outer peripheral edge of the door panel towards the housing 1. A second hinge post is provided on the inner peripheral side of the door frame. One end of the second hinge post is integrally formed with the inner side surface of the door panel, and the end surface of the opposite extended end is connected to the second mounting seat 330; by supporting the second hinge post through the door frame, the bearing capacity of the second hinge post for the stress parallel to the door panel direction is improved, thereby improving the structural strength of the second hinge post.

[0043] In an embodiment of the present invention, a recessed avoidance groove is provided on the end surface of the extended end of the door frame. The end surface of the extended end of the second hinge post is flush with the bottom of the avoidance groove. A part of the second mounting seat 330 is in contact with the bottom of the avoidance groove, and the bushing 340 is located in the avoidance groove, so as to ensure that the door body 2 has a sufficient opening and closing angle while making the bushing 340 as close as possible to the outer peripheral side of the door body 2, making the door body 2 in the open state more compact with the housing 1.

[0044] In an embodiment of the present invention, the door frame is composed of two spaced inner and outer side plates. The bushing 340 is located inside the outer side plate. The outer side plate is parallel to the limiting rib 341. The height by which the outer side plate protrudes from the door panel is less than the distance between the extended end of the limiting rib 341 and the door panel; so that when the limiting rib 341 abuts against the first mounting seat 310, the outer side plate is spaced from the first mounting seat 310 by a certain distance; at the same time, the outer side plate shields the hinge assembly 3 inside the door body 2 to prevent dust from falling into the bushing 340 and affecting the smooth opening and closing of the door body 2.

[0045] In an embodiment of the present invention, the first mounting seat 310 includes a first mounting portion 311. One side of the first mounting portion 311 is in fitting contact with the housing 1, and on the opposite side, a second mounting portion 312 protruding from the surface is integrally formed. The fixed end of the hinge cantilever 320 is connected to the extending end of the second mounting portion 312; the limiting rib 341 abuts against the middle of the second mounting portion 312; while the limiting rib 341 is in stable contact with the first mounting seat 310, the second mounting portion 312 abuts against the limiting rib 341, so that when a large force in the opening direction is applied to the door body 2, the second mounting portion 312 can absorb part of the impact force applied by the limiting rib 341 through elastic deformation, reduce the force borne by the first mounting portion 311, and prevent the connection position between the first mounting portion 311 and the housing 1 from shifting, resulting in the situation where the door body 2 cannot be properly latched onto the housing 1.

[0046] In an embodiment of the present invention, the hinge cantilever 320 is integrally formed with the first mounting seat 310.

[0047] In an embodiment of the present invention, the housing 1 includes a back plate and a support wall protruding from the outer peripheral portion of the back plate. The housing 1 is further provided with a first hinge post protruding from the surface. The first hinge post is integrally formed with the inner side surface of the support wall; the extending end of the first hinge post is connected to the first mounting seat 310; the groove-shaped housing 1 formed by the back plate and the support wall forms an installation cavity for accommodating other functional components of the external delivery device; by supporting the first hinge post through the support wall, the structural strength of the first hinge post is improved, preventing the deformation of the first hinge post from causing the installation position of the hinge assembly 3 and the housing 1 to shift, resulting in the situation where the door body 2 cannot be latched onto the housing 1.

[0048] In an embodiment of the present invention, the first mounting portion 311 is a plate-like structure. One side plate surface of the plate-like first mounting portion 311 is in fitting contact with the end surface of the extending end of the first hinge post, and the second mounting portion 312 is integrally formed with one side edge of the first mounting portion 311 close to the support wall.

[0049] In an embodiment of the present invention, the back plate is vertically arranged, the first hinge post extends horizontally forward, and the plate surface of the first mounting portion 311 is perpendicular to the extending direction of the first hinge post.

[0050] In an embodiment of the present invention, the second mounting portion 312 extends forward perpendicular to the plate surface of the first mounting portion 311. The upper and lower sides of the extending end of the second mounting portion 312 are respectively connected to the hinge cantilever 320, and one side side wall of the second mounting portion 312 close to the support wall of the housing 1 abuts against the limiting rib 341.

[0051] In an embodiment of the present invention, each hinge cantilever 320 extends from the second mounting portion 312 to the outside of the housing 1, and the extending directions are respectively parallel to the plate surface of the plate-like first mounting portion 311.

[0052] In an embodiment of the present invention, columnar connecting portions 323 with vertically arranged axes are integrally formed at the extending ends of the hinge cantilevers 320 respectively, and the connecting portions 323 are coaxially arranged with the hinge shafts respectively.

[0053] In an embodiment of the present invention, a certain distance is provided between the hinge cantilever 320 and the support wall of the housing 1. The connecting portions 323 are respectively located between the extending ends of the corresponding hinge cantilevers 320 and the support wall of the housing 1, and the peripheral wall on the side of the columnar connecting portion 323 away from the support wall is tangentially connected to the hinge cantilever 320; so that after the door body 2 rotates, the door frame of the door body 2 rotates into the interval space between the hinge cantilever 320 and the housing 1, making the structure of the external feeding device more compact.

[0054] In an embodiment of the present invention, the hinge shaft is integrally formed with the connecting portion 323.

[0055] In an embodiment of the present invention, the hinge shaft is separately arranged from the connecting portion 323, and through holes for the hinge shaft to pass through are respectively arranged on the connecting portions 323; during the installation process, after the shaft sleeve 340 and the through holes of the connecting portions 323 are coaxially placed, the hinge shaft is then inserted into the through holes, so that the connecting portion 323 is rotatably connected to the shaft sleeve 340 through the hinge shaft.

[0056] In an embodiment of the present invention, the extending end of the hinge shaft 321 is located in front of the front end face of the support wall.

[0057] In an embodiment of the present invention, support columns 110 protruding from the surface are provided on the housing 1, support holes 313 coaxially arranged with the support columns 110 are formed on the first mounting seat 310, and the first mounting seat 310 is sleeved on the support columns 110 through the support holes 313, and the hole wall of the support hole 313 is in fitting contact with the support column 110; by providing the support columns 110 to support the first mounting seat 310, the stability of the installation between the first mounting seat 310 and the housing 1 is improved; at the same time, during installation, the first mounting seat 310 can be sleeved on the support columns 110 and then fixed by screws, realizing pre-positioning of the first mounting seat 310, which provides convenience for the assembly of the external feeding device.

[0058] In an embodiment of the present invention, the support column 110 is separately provided from the housing 1, and the hardness of the support column 110 is greater than that of the housing 1; specifically, a slot recessed inward is provided on the end surface of the extended end of the first hinge column in the housing 1, and a plate-shaped support plate is integrally formed at the fixed end of the support column 110, and the support plate is in close contact with the respective groove walls and the groove bottom of the slot; by providing the separate support column 110, the support column 110 can be made of a material with a relatively high hardness, improving the structural strength, thereby enhancing the stability of the support for the first hinge seat to prevent the first hinge seat from deforming under the gravitational pull of the door body 2 and other components of the hinge assembly 3, resulting in the situation of the door body 2 sinking.

[0059] In an embodiment of the present invention, the axes of the bushing 340 and the hinge shaft 321 are respectively vertically arranged, and a positioning groove 322 with an upward opening is provided on the upper surface of the hinge cantilever 320 connected to the lower end of the hinge shaft 321; when the limiting rib 341 is in abutting contact with the first mounting seat 310, a part of the bushing 340 is located in the positioning groove 322; when the limiting rib 341 is not in contact with the first mounting seat 310, the lower end of the bushing 340 is in close contact with the end surface of the top of the positioning groove 322.

[0060] Through the above settings, when performing operations such as supplementing additives or replacing and repairing parts on the external feeding device, the opened door body 2 is positioned through the positioning groove 322 to prevent the door body 2 from rotating under the drive of wind or collision with other objects, and the door body 2 collides with the worker's arm, affecting the progress of the operation.

[0061] In an embodiment of the present invention, a positioning portion 342 protruding downward is provided on the lower end surface of the bushing 340, and the positioning portion 342 is detachably arranged in the positioning groove 322; by correspondingly providing the positioning portion 342, when the door body 2 is opened and closed to the corresponding position, the bushing 340 and the door body 2 synchronously fall a certain distance by gravity, so that the positioning portion 342 is inserted into the positioning groove 322 to realize the limitation of the door body 2. When closing the door body 2, only need to lift the door body 2 upward to separate the positioning portion 342 from the positioning groove 322 to unlock the door body 2, and then rotate the door body 2 to make the door body 2 buckle on the housing 1.

[0062] In an embodiment of the present invention, the length of the positioning rib in the vertical direction is slightly greater than the depth of the positioning groove 322.

[0063] In an embodiment of the present invention, the length of the positioning rib in the vertical direction is equal to the depth of the positioning groove 322.

[0064] In an embodiment of the present invention, when the limiting rib 341 is in contact with the first mounting seat 310, the distance between the upper end surface of the bushing 340 and the lower surface of the upper connecting portion 323 is equal to the depth of the positioning groove 322.

[0065] In an embodiment of the present invention, when the limiting rib 341 does not contact the first mounting seat 310, the bottom end face of the positioning portion 342 is in fitting contact with the top of the positioning groove 322.

[0066] In an embodiment of the present invention, the positioning portion 342 is a quadrilateral convex platform structure. The two pairs of side walls of the convex platform-shaped positioning portion 342 are respectively arc-shaped walls flush with the outer peripheral surface of the bushing 340, and the other two pairs of side walls are respectively in fitting contact with the groove walls of the positioning groove 322.

[0067] In an embodiment of the present invention, the hinge shaft is located in the middle of the bottom of the positioning groove 322, and the groove wall of the positioning groove 322 is arranged at a certain distance from the hinge shaft; so that the part of the positioning portion 342 located between the hinge shaft and the groove wall of the positioning groove 322 has a certain thickness, preventing this part from rupturing due to low thickness and structural strength when the opening and closing door body 2 is subjected to a large degree of impact force, resulting in the failure of the positioning effect of the positioning portion 342.

[0068] In an embodiment of the present invention, the two groove walls of the positioning groove 322 are respectively arranged parallel to the same radial direction of the hinge shaft 321; when the door body 2 is subjected to a thrust force in the opening direction or the closing direction, the two groove walls of the positioning groove 322 can provide support forces opposite to the thrust force direction for the positioning portion 342, preventing an angle between the thrust force and the support force, which may cause the bottom of the separating drive bushing 340 to squeeze the hinge shaft, resulting in deformation or even fracture of the corresponding position at the bottom of the hinge shaft.

[0069] In an embodiment of the present invention, the positioning groove 322 is opened on the upper surface of the lower connecting portion 323.

[0070] The above are only preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications using the above-mentioned disclosed technical content into equivalent embodiments of equivalent changes. The implementation schemes in the above embodiments can be further combined or replaced, but any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An external feeding device, comprising a housing (1) and a door body (2) buckled on the opening of the housing (1), and the door body (2) is rotatably connected to the housing (1) through a hinge assembly (3); It is characterized in that The hinge assembly (3) includes a bushing (340) and a first mounting seat (310). The first mounting seat (310) is provided with hinge cantilevers (320) protruding from the surface at intervals. The extending ends of the two hinge cantilevers (320) are respectively connected to both ends of a hinge shaft (321), and the bushing (340) is coaxially sleeved outside the hinge shaft (321); The bushing (340) is provided with a limiting rib (341) extending towards the first mounting seat (310), and the extending end of the limiting rib (341) abuts against the hinge cantilever (320).

2. An external feeding device according to claim 1, It is characterized in that The limiting rib (341) is a boss-type structure protruding from the outer peripheral surface of the bushing (340), and the end surface of the extending end of the boss-type limiting rib (341) is in fitting contact with the first mounting seat (310).

3. An external feeding device according to claim 2, It is characterized in that At least one side wall of the boss-type limiting rib (341) is inclined inwards from the bushing (340) to the extending end.

4. An external feeding device according to claim 2, It is characterized in that One side wall of the boss-type limiting rib (341) is tangent to the outer peripheral surface of the bushing (340), and this side wall is perpendicular to the end surface of the extending end of the boss-type limiting rib (341).

5. An external feeding device according to claim 1, It is characterized in that The first mounting seat (310) includes a first mounting portion (311). One side of the first mounting portion (311) is in fitting contact with the housing (1), and the other opposite side is integrally formed with a second mounting portion (312) protruding from the surface. The fixed end of the hinge cantilever (320) is connected to the extending end of the second mounting portion (312); The limiting rib (341) abuts against the middle of the second mounting portion (312).

6. An external feeding device according to any one of claims 1-5, It is characterized in that The housing (1) is provided with a support column (110) protruding from the surface. The first mounting seat (310) is provided with a support hole (313) coaxially arranged with the support column (110). The first mounting seat (310) is sleeved on the support column (110) through the support hole (313), and the hole wall of the support hole (313) is in fitting contact with the support column (110).

7. An external feeding device according to any one of claims 1-5, It is characterized in that The axes of the bushing (340) and the hinge shaft (321) are respectively arranged vertically. An upward-opening positioning groove (322) is arranged on the upper surface of the hinge cantilever (320) connected to the lower end of the hinge shaft (321); When the limiting rib (341) abuts against the first mounting seat (310), a part of the bushing (340) is located in the positioning groove (322); When the limiting rib (341) is not in contact with the first mounting seat (310), the lower end of the bushing (340) is in fitting contact with the end surface of the top of the positioning groove (322).

8. An external feeding device according to claim 7, characterized in that, a positioning portion (342) protruding downward is provided on the lower end face of the bushing (340), and the positioning portion (342) is detachably arranged in the positioning groove (322).

9. An external feeding device according to claim 8, characterized in that, the positioning portion (342) is a quadrilateral boss structure, and the two pairs of side walls of the boss-shaped positioning portion (342) are respectively arc-shaped walls flush with the outer peripheral surface of the bushing (340), and the other two pairs of side walls are respectively in contact with the groove walls of the positioning groove (322).

10. An external feeding device according to claim 9, characterized in that, the two side walls of the positioning groove (322) are respectively arranged parallel to the same radial direction of the hinge shaft (321).

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