Automatic door opening mechanism

Abstract

The utility model relates to the technical field of intelligent door locks, in particular to an automatic door opening mechanism which comprises a shell, a driving device and an ejection piece, a limiting cavity with an opening in one end is formed in the shell, and a door opening position and a door closing position are arranged in the limiting cavity; the driving device comprises a driving part, a transmission part and an acting assembly, the fixed end of the driving part is connected with the shell, and the driving end of the driving part is connected with the acting assembly through the transmission part; the ejection piece is arranged in the limiting cavity, and the ejection piece is movably arranged between the door opening position and the door closing position; the ejection piece is connected with the acting assembly, and the ejection piece is configured to be driven by the acting assembly to move between the door opening position and the door closing position; the ejection part comprises an ejection section, and the ejection section extends out of the limiting cavity at the door opening position and retracts into the limiting cavity at the door closing position so that it can be guaranteed that no force is applied to the door frame and the hinge on the door leaf, and the situation that after the door is closed, the ejection part abuts against the door frame for a long time, and the hinge is prone to abnormal sound and damage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent door locks, in particular to an automatic door opening mechanism. Background Art

[0002] At present, intelligent products have penetrated into people's lives. Door unlocking has evolved from using keys to unlocking with smart handles by entering passwords, fingerprints, faces, etc., but it is ultimately impossible to get rid of the action of opening the door with hands.

[0003] Mechanical door springs on the market have problems such as the door cannot be opened due to too little force or the door can be opened due to too much force. However, after closing the door, the mechanical door springs will be pressed against the door frame for a long time, which may cause abnormal noise and damage to the hinges on the door body.

[0004] Therefore need to develop a kind of door opening mechanism, to meet the requirement of above-mentioned door opening or closing. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is that the mechanical door springs in the prior art have problems such as the door cannot be opened due to too little force or the door can be opened due to too much force, but after closing the door, the mechanical door springs will press against the door frame for a long time, which may easily cause abnormal noise and damage to the hinges inside.

[0006] To this end, the utility model provides an automatic door opening mechanism, comprising:

[0007] The housing has a limiting cavity with one end open inside, and the limiting cavity has an open position and a closed position;

[0008] The driving device includes a driving member, a transmission member, and an action component, wherein the fixed end of the driving member is connected to the housing, the driving end of the driving member is connected to the action component via the transmission member, and the action component is disposed in the limiting cavity;

[0009] An ejector is disposed inside the limiting cavity and is movably arranged between the door opening position and the door closing position;

[0010] The ejector is connected to the action assembly, and the ejector is configured to be driven by the action assembly to move between the door opening position and the door closing position;

[0011] The ejector member includes an ejector section. In the door-open position, the ejector section extends out of the limiting cavity. In the door-closed position, the ejector section retracts into the limiting cavity.

[0012] As an embodiment, the active component includes:

[0013] a screw rod, movably disposed in the limiting cavity, the screw rod being connected to the driving member via the transmission member;

[0014] A sliding member is sleeved on the screw rod, and the sliding member and the screw rod are connected by threaded fitting;

[0015] The sliding member is connected to the ejector member, and the sliding member is configured to be driven by the screw rod to drive the ejector member to move.

[0016] As an embodiment, the action assembly further includes a reset auxiliary member, and the reset auxiliary member is provided between the ejection member and the housing;

[0017] The reset auxiliary member is an elastic member. When the ejection member is in the door-opening position, the reset auxiliary member is elastically deformed by being squeezed by the ejection member, and the reset auxiliary member has an elastic force that pushes the ejection member to move toward the door-closing position.

[0018] As an embodiment, the housing further comprises a panel, the panel being provided on one side of the opening end of the limiting cavity, and the panel being provided with a through hole suitable for inserting the ejection section of the ejection member;

[0019] The reset auxiliary component is arranged between the panel and the ejection component.

[0020] As an embodiment, the reset auxiliary member is a columnar spring, and one end of the reset auxiliary member is sleeved on the ejection section.

[0021] As an embodiment, the ejection member further includes a connecting seat, one end of which is connected to the sliding member, and the other end of which is connected to the ejection section;

[0022] When the ejector is in the door-opening position, the connecting seat abuts against the inner side of the panel;

[0023] When the ejector is in the door-closing position, the connecting seat is separated from the inner side of the panel.

[0024] As an embodiment, the action component further includes a buffer member, one end of the buffer member is connected to the ejection member, and the other end of the buffer member is connected to the sliding member, and the buffer member is an elastic member.

[0025] As an embodiment, both ends of the buffer member are fixed to the ejection member and the sliding member;

[0026] Alternatively, both ends of the buffer member abut against the ejection member and the sliding member.

[0027] As an embodiment, the buffer member is a columnar spring, and one end of the buffer member is sleeved on the screw rod.

[0028] As an embodiment, the shell further includes an upper shell and a lower shell, and grooves are provided in the upper shell and the lower shell. The upper shell and the lower shell are buckled together and the grooves of the two constitute the limiting cavity.

[0029] The automatic door opening mechanism provided by the utility model has the following advantages:

[0030] 1. The utility model provides an automatic door opening mechanism, comprising a shell, a driving device and an ejector, wherein a limiting cavity with an opening at one end is provided inside the shell, and the limiting cavity has a door opening position and a door closing position; the driving device comprises a driving member, a transmission member and an acting assembly, the fixed end of the driving member is connected to the shell, the driving end of the driving member is connected to the acting assembly via the transmission member, and the acting assembly is arranged in the limiting cavity; the ejector is arranged in the limiting cavity, and the ejector is movably arranged between a door opening position and a door closing position; the ejector is connected to the acting assembly, and the ejector is configured to be driven by the acting assembly to move between the door opening position and the door closing position; the ejector comprises an ejection section, which extends out of the limiting cavity in the door opening position and retracts into the limiting cavity in the door closing position.

[0031] During installation, the automatic door opening mechanism is installed on the door leaf. When the door needs to be opened, the driving member transmits the force to the acting component through the transmission member. The acting component drives the ejector to move within the limit cavity to the door opening position. When the ejector moves to the door opening position, the ejection section of the ejector extends out of the limit cavity and abuts against the door frame, completing the door opening. Similarly, when the door needs to be closed, the driving member reverses and transmits the force to the acting component through the transmission member. The acting component drives the ejector to move within the limit cavity to the door closing position. When the ejector moves to the door closing position, the ejection section retracts into the limit cavity, and the ejector disengages from the door frame to ensure that no force is applied to the door frame or the hinges on the door leaf. This prevents the ejector from pressing against the door frame for a long time after the door is closed, which can easily cause abnormal noise or damage to the hinges.

[0032] 2. The present invention provides an automatic door opening mechanism, wherein the action component further comprises a reset auxiliary member, wherein the reset auxiliary member is provided between the ejector and the housing;

[0033] The reset auxiliary member is an elastic member. When the ejection member is in the door-opening position, the reset auxiliary member is elastically deformed by being squeezed by the ejection member, and the reset auxiliary member has an elastic force that pushes the ejection member to move toward the door-closing position.

[0034] The automatic door opening mechanism of this structure is provided with a reset auxiliary part, and the reset auxiliary part is an elastic part. During the movement of the ejector part to the door-opening position, since the reset auxiliary part is provided between the ejector part and the shell, the reset auxiliary part is squeezed by the ejector part and elastically deformed. That is, the reset auxiliary part has an elastic force that pushes the ejector part to move toward the door-closing position. When the door needs to be closed, the elastic force of the reset auxiliary part can push the ejector part to move to the door-closing position, thereby assisting the ejector part in resetting.

[0035] 3. The utility model provides an automatic door opening mechanism, wherein the action component further includes a buffer member, one end of the buffer member is connected to the ejection member, and the other end of the buffer member is connected to the sliding member, and the buffer member is an elastic member.

[0036] This automatic door opening mechanism incorporates a buffer between the ejector and the slider. If the automatic door opening mechanism is blocked by obstacles or a sudden power outage, or other factors prevent it from functioning properly, the buffer compresses and protects the driver, transmission, and other components, preventing the door from closing properly or causing damage to the components due to forced door closing. In this embodiment, the buffer is a cylindrical spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 An exploded view of the automatic door opening mechanism provided in an embodiment of the present utility model;

[0039] Figure 2 This is a schematic diagram of the position of the automatic door opening mechanism provided in an embodiment of the present utility model when the door is closed;

[0040] Figure 3 This is a schematic diagram of the position of the automatic door opening mechanism provided in an embodiment of the present utility model when the door is opened.

[0041] Description of reference numerals:

[0042] 101-upper housing; 102-lower housing; 103-panel;

[0043] 2- driving member;

[0044] 3- transmission part; 31- large bevel gear; 32- small bevel gear;

[0045] 41-screw rod; 42-sliding member; 43-resetting auxiliary member; 44-buffer member;

[0046] 5- ejector; 51- ejector section; 52- connecting seat; 53- head section;

[0047] 6-bearing;

[0048] 7-Limiting cavity. DETAILED DESCRIPTION

[0049] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] Example

[0052] This embodiment provides an automatic door opening mechanism, such as Figures 1 to 3 As shown, it includes a housing, a driving device and an ejector 5.

[0053] In this embodiment, a limiting cavity 7 with an open end is provided inside the shell, and the limiting cavity 7 has an open door position and a closed door position; the driving device includes a driving member 2, a transmission member 3 and an acting component, the fixed end of the driving member 2 is connected to the shell, and the driving end of the driving member 2 is connected to the acting component via the transmission member 3, and the acting component is arranged in the limiting cavity 7; the ejector 5 is arranged inside the limiting cavity 7, and the ejector 5 is movably arranged between the open door position and the closed door position; the ejector 5 is connected to the acting component, and the ejector 5 is configured to be driven by the acting component to move between the open door position and the closed door position; the ejector 5 includes an ejection section 51, which extends out of the limiting cavity 7 in the open door position and retracts into the limiting cavity 7 in the closed door position.

[0054] During installation, the automatic door opening mechanism is installed on the door leaf. When the door needs to be opened, the driving member 2 transmits the force to the acting assembly via the transmission member 3. The acting assembly drives the ejector 5 to move within the limiting cavity 7 to the door opening position. When the ejector 5 moves to the door opening position, the ejection section 51 of the ejector 5 extends out of the limiting cavity 7 and abuts against the door frame, completing the door opening. Similarly, when the door needs to be closed, the driving member 2 reverses and transmits the force to the acting assembly via the transmission member 3. The acting assembly drives the ejector 5 to move within the limiting cavity 7 to the door closing position. When the ejector 5 moves to the door closing position, the ejection section 51 retracts into the limiting cavity 7, and the ejector 5 disengages from the door frame to ensure that no force is applied to the door frame or the hinges on the door leaf. This prevents the ejector 5 from pressing against the door frame for a long time after the door is closed, which can easily cause abnormal noise or damage to the hinges. Preferably, the driving member 2 is a motor.

[0055] Specifically, Figure 2 The figure shows the position of the ejector 5 when it is in the door closing position. Figure 3 The figure shows the position of the ejector 5 in the door-open position. Specifically, the door-open position refers to the position of the ejector 5 in the limiting cavity 7 when the ejection section 51 of the ejector 5 extends out of the limiting cavity 7. Similarly, the door-closed position refers to the position of the ejector 5 in the limiting cavity 7 when the ejection section 51 of the ejector 5 retracts into the limiting cavity 7.

[0056] In some embodiments, as Figure 1 As shown, the housing is divided into an upper housing 101 and a lower housing 102 to facilitate assembly of its internal parts. Both the upper housing 101 and the lower housing 102 are provided with grooves so that when the upper housing 101 and the lower housing 102 are closed, the grooves on the upper and lower housings snap together to form the above-mentioned limiting cavity 7.

[0057] In the above structure, the upper shell 101 and the lower shell 102 can be connected by bolts or snap-fit.

[0058] In this embodiment, if Figure 1 As shown, the working component includes a screw rod 41 and a sliding member 42. The screw rod 41 is movably arranged in the limiting cavity 7 and is connected to the driving member 2 via the transmission member 3; the sliding member 42 is sleeved on the screw rod 41, and the sliding member 42 and the screw rod 41 are connected by a threaded fit; the sliding member 42 is connected to the ejector 5, and the sliding member 42 is configured to be driven by the screw rod 41 to drive the ejector 5 to move.

[0059] The screw rod 41 is movably arranged in the limiting cavity 7. Specifically, a bearing 6 can be sleeved on the screw rod 41. The bearing 6 can limit the screw rod 41 and ensure the rotation of the screw rod 41. The sliding member 42 is sleeved on the screw rod 41. The sliding member 42 is provided with a through hole. The inner wall of the through hole is provided with an internal thread that matches the external thread of the screw rod 41. When the screw rod 41 rotates, the sliding member 42 can be driven by the thread to reciprocate along the axial direction of the sliding member 42 on the screw rod 41.

[0060] In this embodiment, if Figure 1 As shown, the transmission member 3 includes large bevel teeth 31 and small bevel teeth 32. The large bevel teeth 31 are fixed to the end of the screw rod 41 near the driving member 2. The small bevel teeth 32 mesh with the large bevel teeth 31 and are fixed to the driving end of the driving member 2. This structure can transmit the power of the driving member 2 to the screw rod 41. During use, the small bevel teeth 32 drive the large bevel teeth 31, thereby reducing the speed and increasing the torque, and changing the torque output direction to the horizontal direction.

[0061] In this embodiment, if Figure 1 As shown, the action component also includes a reset auxiliary member 43, which is arranged between the ejector 5 and the shell; the reset auxiliary member 43 is an elastic member. When the ejector 5 is in the door-opening position, the reset auxiliary member 43 is squeezed by the ejector 5 to produce elastic deformation, and the reset auxiliary member 43 has an elastic force to push the ejector 5 to move toward the door-closing position.

[0062] By providing the resetting aid 43, which is an elastic member, the resetting aid 43 is located between the ejector 5 and the housing. As the ejector 5 moves toward the door-open position, the resetting aid 43 is squeezed by the ejector 5 and elastically deforms. This means that the resetting aid 43 exerts an elastic force that pushes the ejector 5 toward the door-closed position. When the door needs to be closed, the elastic force of the resetting aid 43 pushes the ejector 5 toward the door-closed position, assisting in resetting the ejector 5.

[0063] In this embodiment, the housing further comprises a panel 103, which is provided on one side of the opening end of the limiting cavity 7. The panel 103 is provided with a through hole suitable for inserting the ejection section 51 of the ejection member 5. The reset auxiliary member 43 is provided between the panel 103 and the ejection member 5. Specifically, Figure 1 As shown, the open end of the limiting cavity 7 is the left side of the shell in the figure.

[0064] By setting a panel 103, the panel 103 is fixed on one side of the open end of the limiting cavity 7, and a through hole suitable for inserting the ejector 5 is provided on the panel 103. When the reset auxiliary member 43 is installed, the end of the reset auxiliary member 43 abuts against the panel 103 so that it can be elastically deformed when squeezed by the ejector 5.

[0065] In this embodiment, if Figure 1 As shown, the ejector 5 also includes a connecting seat 52, one end of the connecting seat 52 is connected to the sliding member 42, and the other end of the connecting seat 52 is connected to the ejection section 51; when the ejector 5 is in the door-opening position, the connecting seat 52 abuts against the inner side of the panel 103, and when the ejector 5 is in the door-closing position, the connecting seat 52 is separated from the inner side of the panel 103.

[0066] It should be noted that a head section 53 is provided at the end of the ejection section 51 of the ejection member 5. Regardless of whether it is in the door position or the door closed position, the head section 53 is inserted into the through hole of the panel 103, and only the ejection section 51 extends out or retracts into the limiting cavity 7.

[0067] Preferably, the reset auxiliary member 43 is a columnar spring, and one end of the reset auxiliary member 43 is sleeved on the ejection section 51 .

[0068] In this embodiment, the action component further includes a buffer member 44 , one end of the buffer member 44 is connected to the ejector 5 , and the other end of the buffer member 44 is connected to the sliding member 42 . The buffer member 44 is an elastic member.

[0069] By providing a buffer member 44 between the ejector member 5 and the sliding member 42, if the automatic door opening mechanism fails to operate normally due to factors such as a sudden power outage during door opening, the buffer member 44 can compress and protect the driver member 2, transmission member 3, and other accessories, preventing the door from being unable to close or being damaged by forced door closing. In this embodiment, the buffer member 44 is a cylindrical spring.

[0070] In this embodiment, the ends of the buffer member 44 abut against the ejector 5 and the slider 42. In this structure, when the door is opened, the slider 42 moves toward the door-opening position, compressing the buffer member 44 and pushing the ejector 5 to the door-opening position. When the door is closed, the slider 42 retracts, and the buffer member 44 recovers its deformation during the retraction process, while the ejector 5 returns to the door-closed position due to the elastic force of the return assist member 43.

[0071] Alternatively, the ends of the buffer 44 are fixed to the ejector 5 and the slider 42. To open the door, the slider 42 moves toward the door-opening position. During this process, the buffer 44 is compressed, pushing the ejector 5 to the door-opening position. Similarly, because the ends of the buffer 44 are fixed to the ejector 5 and the slider 42, the buffer 44 can also pull the ejector 5 back when the slider 42 retracts. During this process, the retraction assisting member 43 also assists the ejector 5 in retracting.

[0072] In this embodiment, the sliding member 42 and the ejector 5 are both provided with limiting protrusions on their circumferences; the limiting cavity 7 is provided with limiting grooves adapted to the limiting protrusions to limit the moving directions of the sliding member 42 and the ejector 5 and prevent the sliding member 42 from rotating.

[0073] like Figure 1 As shown, the limiting protrusions on the sides of the sliding member 42 and the ejector 5 are both long strip structures arranged along the moving direction of the ejector 5. There are four limiting protrusions on the sides of the sliding member 42, and the four limiting protrusions are evenly distributed on the sides of the sliding member 42. There are two limiting protrusions on the sides of the ejector 5, and the two limiting protrusions on the sides of the ejector 5 are arranged on opposite sides of the ejector 5. Correspondingly, a limiting groove is also provided on the wall of the limiting cavity 7 along the moving direction of the ejector 5. The limiting protrusions on the sides of the sliding member 42 and the ejector 5 are both slidably arranged inside the limiting groove, thereby limiting the movement of the sliding member 42 and the ejector 5, and improving the stability of the movement of the sliding member 42 and the ejector 5.

[0074] The automatic door opening mechanism provided in this embodiment works as follows:

[0075] When the door needs to be opened, the driver 2 rotates the small bevel gear 32, which in turn rotates the large bevel gear 31, thereby reducing the rotational speed and increasing the torque, and changing the torque output direction to the horizontal. The large bevel gear 31 also rotates the screw rod 41. As the screw rod 41 rotates, it drives the slider 42 on the screw rod 41 toward the door opening position through the thread. During this movement, the slider 42 squeezes the ejector 5 through the buffer 44 until the ejector 5 reaches the door opening position. At this point, the ejector section 51 of the ejector 5 extends out of the limit cavity 7 and abuts against the door frame, completing the door opening. As the ejector 5 moves toward the door opening position, the reset auxiliary member 43, which is located between the ejector 5 and the housing, is squeezed by the ejector 5 and elastically deforms.

[0076] When the door needs to be closed, the driving member 2 reverses, driving the screw rod 41 to reverse, thereby driving the sliding member 42 to move on the screw rod 41 toward the door closing position. During the movement of the sliding member 42, the buffer member 44 loses its compression and recovers its deformation. The reset auxiliary member 43 simultaneously recovers its deformation and moves the ejector 5 toward the door closing position until the ejector 5 moves to the door closing position. When the ejector 5 moves to the door closing position, the ejection section 51 retracts into the limiting cavity 7, and the ejector 5 disengages from the door frame to ensure that no force is applied to the door frame and the hinges on the door leaf. This prevents the ejector 5 from pressing against the door frame for a long time after the door is closed, which may easily cause abnormal noise or damage to the hinges. Preferably, the driving member 2 is a motor.

[0077] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An automatic door opening mechanism, characterized in that: include: The housing is provided with a limiting cavity (7) with one end open, and the limiting cavity (7) has a door opening position and a door closing position; A driving device comprises a driving member (2), a transmission member (3) and an action component, wherein the fixed end of the driving member (2) is connected to the housing, the driving end of the driving member (2) is connected to the action component via the transmission member (3), and the action component is arranged in the limiting cavity (7); An ejector (5) is disposed inside the position-limiting cavity (7), and the ejector (5) is movably disposed between the door-opening position and the door-closing position; The ejector (5) is connected to the action component, and the ejector (5) is configured to be driven by the action component to move between the door opening position and the door closing position; The ejection member (5) comprises an ejection section (51). In the door-opening position, the ejection section (51) extends out of the limiting cavity (7). In the door-closing position, the ejection section (51) retracts into the limiting cavity (7).

2. The automatic door opening mechanism according to claim 1, characterized in that: The functional components include: A screw rod (41) is movably arranged in the limiting cavity (7), and the screw rod (41) is connected to the driving member (2) via the transmission member (3); A sliding member (42) is sleeved on the screw rod (41), and the sliding member (42) and the screw rod (41) are connected by threaded fitting; The sliding member (42) is connected to the ejector (5), and the sliding member (42) is configured to be driven by the screw rod (41) to drive the ejector (5) to move.

3. The automatic door opening mechanism according to claim 2, characterized in that: The action assembly further includes a reset auxiliary member (43), and the reset auxiliary member (43) is arranged between the ejection member (5) and the housing; The reset auxiliary member (43) is an elastic member. When the ejection member (5) is in the door-opening position, the reset auxiliary member (43) is squeezed by the ejection member (5) to produce elastic deformation, and the reset auxiliary member (43) has an elastic force that pushes the ejection member (5) to move toward the door-closing position.

4. The automatic door opening mechanism according to claim 3, characterized in that: The housing further comprises a panel (103), the panel (103) being arranged on one side of the opening end of the limiting cavity (7), and the panel (103) being provided with a through hole suitable for inserting the ejection section (51) of the ejection member (5); The resetting auxiliary member (43) is arranged between the panel (103) and the ejection member (5).

5. The automatic door opening mechanism according to claim 3 or 4, characterized in that: The reset auxiliary component (43) is a columnar spring, and one end of the reset auxiliary component (43) is sleeved on the ejection section (51).

6. The automatic door opening mechanism according to claim 4, characterized in that: The ejection member (5) further includes a connecting seat (52), one end of the connecting seat (52) is connected to the sliding member (42), and the other end of the connecting seat (52) is connected to the ejection section (51); When the ejector (5) is in the door-opening position, the connecting seat (52) abuts against the inner side of the panel (103); When the ejector (5) is in the door-closing position, the connecting seat (52) is separated from the inner side of the panel (103).

7. The automatic door opening mechanism according to claim 3, characterized in that: The action component further includes a buffer member (44), one end of the buffer member (44) is connected to the ejection member (5), and the other end of the buffer member (44) is connected to the sliding member (42).

8. The automatic door opening mechanism according to claim 7, characterized in that: The two ends of the buffer member (44) are fixed to the ejector member (5) and the sliding member (42); Alternatively, both ends of the buffer member (44) abut against the ejector member (5) and the sliding member (42).

9. The automatic door opening mechanism according to claim 7 or 8, characterized in that: The buffer member (44) is a columnar spring, and one end of the buffer member (44) is sleeved on the screw rod (41).

10. The automatic door opening mechanism according to any one of claims 1 to 4, characterized in that: The housing further comprises an upper housing (101) and a lower housing (102), wherein grooves are provided in the upper housing (101) and the lower housing (102), and the upper housing (101) and the lower housing (102) are engaged with each other and the grooves of the two constitute the limiting cavity (7).

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