Door opening device for dish washing machine and dish washing machine

Abstract

The utility model belongs to the technical field of dish-washing machines, and particularly discloses a door opening device for a dish-washing machine and the dish-washing machine. The door opening device comprises a hinge support and a rotating hinge hinged to the hinge support, and further comprises a magnetic part arranged on a magnet mounting seat, the magnet mounting seat is arranged on the rotating hinge, and the magnet mounting seat is provided with a first limiting structure to restrain the magnetic pole direction of the magnetic part; the magnetic induction piece is arranged on the hinge support and used for detecting the magnetic pole direction of the magnetic piece. The PCB is arranged on the hinge support, electrically connected with the magnetic induction piece and used for obtaining the rotation angle and / or the rotation speed and / or the rotation acceleration of the magnetic piece according to the change of the magnetic pole direction detected by the magnetic induction piece. According to the door opening device, the consistency and accuracy of the magnetic pole direction can be guaranteed, the abnormal opening and closing state of the door body can be found in time, and the door opening and closing operation safety and reliability of the dish washing machine with the door opening device are improved.

Description

Technical Field

[0001] This utility model relates to the field of dishwasher technology, and in particular to a door opening device for a dishwasher and a dishwasher. Background Technology

[0002] A dishwasher is a device that automatically cleans dishes using methods such as spraying, ultrasonic waves, or eddy currents combined with high-temperature, high-pressure water flow. A dishwasher consists of a cabinet and a door; the cabinet is opened by rotating the door to load and unload dishes. To improve door safety, dishwashers are equipped with a door-opening sensor. Existing door-opening sensors typically use reed switches or microswitches to detect the door's opening and closing action. Reed switches use door rotation to cause a change in the position of a magnet, resulting in the attraction and separation of two reeds, thus providing feedback on the door's opening and closing. Microswitches transmit the door's opening and closing action to an actuating reed, achieving rapid switching between moving and stationary contacts, also providing feedback on the door's opening and closing action. Both of these door-opening sensor structures can only determine the open or closed state based on on / off signals; they cannot detect the opening and closing angle, opening / closing speed, etc. When an obstacle is present, causing a pause or jamming, the door-opening sensor structure cannot respond promptly, resulting in low safety. Utility Model Content

[0003] The first technical problem solved by this utility model is to provide a door opening device for a dishwasher, which can solve the problem that the existing door opening and closing sensing structure can only determine the two states of opening or closing, and cannot detect the opening and closing angle, opening and closing speed, etc., resulting in low safety.

[0004] The second technical problem solved by this utility model is to provide a dishwasher with a door opening device that can solve the problems of existing door opening and closing sensing structures that can only determine the two states of opening or closing the door and cannot detect the opening and closing angle and opening and closing speed, thereby improving the safety of the dishwasher's door opening and closing.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A door opening device for a dishwasher is provided, including a hinge support and a rotating hinge hinged to the hinge support, and further comprising:

[0007] A magnetic component is disposed on a magnet mounting base, the magnet mounting base being disposed on the rotating hinge, the magnet mounting base having a first limiting structure to constrain the magnetic pole direction of the magnetic component;

[0008] A magnetic induction element is disposed on the hinge support, and the magnetic induction element is used to detect the direction of the magnetic poles of the magnetic element;

[0009] A PCB board is disposed on the hinge support and electrically connected to the magnetic induction element, used to obtain the rotation angle and / or rotation speed and / or rotation acceleration of the magnetic element based on the change in the magnetic pole direction detected by the magnetic induction element.

[0010] The dishwasher door opening device of this utility model has the following advantages compared with the prior art: a rotating hinge is installed on the dishwasher door and can rotate with the door; a magnet mounting base is located on the rotating hinge and can rotate with the hinge; during the rotation of the magnet mounting base, the magnetic component rotates, causing the magnetic poles to rotate. The magnet mounting base has a first limiting structure to constrain the magnetic pole direction of the magnetic component, ensuring the accuracy and consistency of the magnetic pole direction when the door is closed. A magnetic induction element is located on the hinge support and is used to detect the magnetic pole direction of the magnetic component. The magnetic induction element can sense changes in the magnitude and direction of the magnetic field of the magnetic component and convert them into electrical signals for transmission. Simultaneously, the first limiting structure ensures the consistency and accuracy of the magnetic pole direction when the door is closed, preventing relative movement between the magnet mounting base and the magnetic component during the rotation of the rotating hinge, which would affect the magnetic pole direction and the sensing accuracy of the magnetic induction element. The PCB board is located on the hinge support and is electrically connected to the magnetic induction component. Based on the electrical signal generated by the change in the direction of the magnetic pole detected by the magnetic induction component, the rotation angle and / or rotation speed and / or rotation acceleration of the magnetic component are obtained. This allows information such as the real-time position of the rotating hinge, the opening and closing speed of the rotating hinge, and the opening and closing acceleration of the rotating hinge to be obtained in a timely manner. This facilitates the door opening device to detect abnormal states of the opening and closing of the rotating hinge in a timely manner and improves the safety of the door opening device.

[0011] In one embodiment, the first limiting structure includes a limiting protrusion and a limiting groove that can engage with each other, wherein one of the limiting protrusion and the limiting groove is disposed on the magnet mounting base and the other is disposed on the magnetic component.

[0012] In one embodiment, the magnetic element is a circular sheet, the limiting groove is formed on the magnetic element, the depth of the limiting groove extends radially along the magnetic element, and the magnetic south pole and magnetic north pole of the magnetic element are symmetrically located on both sides of the limiting groove.

[0013] In one embodiment, the magnet mounting base has a mounting groove and a baffle surrounding the mounting groove. The limiting protrusion is disposed on the inner side of the baffle, and the limiting slot is formed on the side edge of the magnetic component. The magnetic component is embedded in the mounting groove so that the limiting protrusion engages with the limiting slot.

[0014] In one embodiment, the magnet mounting base further includes a plurality of limiting buckles disposed at the edge of the mounting groove, the buckling ends of the limiting buckles extending toward the center of the mounting groove to restrain the magnetic component from disengaging from the mounting groove.

[0015] In one embodiment, the outer contour of the magnet mounting base is circular, the rotating hinge has a fixing groove, the magnet mounting base is embedded in the fixing groove, and the door opening device further includes a rotation limiting member, one end of which is detachably connected to the magnet mounting base, and the other end is detachably connected to the rotating hinge.

[0016] In one embodiment, the fixing groove extends to the edge of the rotating hinge to form a mounting notch, through which the magnet mounting base can be engaged in the fixing groove. The door opening device also includes a locking buckle that can engage with the mounting notch to prevent the magnet mounting base from disengaging from the fixing groove.

[0017] In one embodiment, the hinge axis of the rotating hinge and the magnetic element are concentrically arranged, the magnetic induction element is disposed on the hinge support, and the magnetic induction element and the magnetic element are arranged sequentially along the extension direction of the hinge axis.

[0018] In one embodiment, the door opening device further includes a rotating support shaft, the rotating hinge and the hinge support are spaced apart, the rotating hinge has a through fixing groove, the magnet mounting base is embedded in the fixing groove, the magnet mounting base has an axially through connecting hole, one end of the rotating support shaft is connected to the hinge support, and the other end is rotatably inserted into the connecting hole; and / or,

[0019] The magnetic induction element is disposed on the PCB board, the PCB board is connected to the PCB board mounting bracket, and the PCB board mounting bracket is detachably connected to the hinge bracket on the side opposite to the rotating hinge.

[0020] The second technical problem mentioned above is solved by the following technical solution:

[0021] A dishwasher is provided, including the above-described door opening device, and further including an inner tub housing and a door body rotatably connected to the inner tub housing. The hinge support of the door opening device is disposed on the inner tub housing, and the rotation hinge of the door opening device is disposed on the door body.

[0022] Compared with the prior art, the dishwasher described in this utility model has the following advantages: the dishwasher includes the above-mentioned door opening device, which can ensure the consistency and accuracy of the magnetic pole direction in the closed state, and avoid the relative movement between the magnet mounting base and the magnetic component during the door rotation process, thus affecting the magnetic pole direction, improving the sensing accuracy of the magnetic induction component, making it easier for the door opening device to detect abnormal states of door opening and closing in a timely manner, and improving the safety and reliability of the dishwasher's door opening and closing operation. Attached Figure Description

[0023] Figure 1 Schematic diagram of the installation structure of the door opening device provided in this embodiment of the utility model Figure 1 ;

[0024] Figure 2 Schematic diagram of the installation structure of the door opening device provided in this embodiment of the utility model Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the structure of the magnetic component provided in an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the magnet mounting base provided in an embodiment of the present utility model;

[0027] Figure 5 A structural disassembly diagram of the door opening device provided in this embodiment of the utility model.

[0028] Figure 6 A front view of the installation structure of the door opening device provided in an embodiment of this utility model;

[0029] Figure 7 for Figure 6 A cross-sectional view along the AA direction;

[0030] Figure 8 yes Figure 7 A magnified view of part B in the middle section;

[0031] Figure 9 This is a partial structural schematic diagram of a dishwasher provided in an embodiment of the present utility model.

[0032] Label Explanation:

[0033] 11. Magnet mounting base; 111. Mounting groove; 112. Baffle; 113. Limiting buckle; 114. Connecting hole; 115. Snap-fit ​​groove; 12. Magnetic component; 131. Limiting protrusion; 132. Limiting slot; 141. Rotating hinge; 1411. Fixing groove; 1412. Mounting notch; 1413. Extension notch; 142. Hinge support; 143. Rotating support shaft;

[0034] 21. PCB board; 22. PCB board mounting bracket;

[0035] 3. Rotation limit component; 31. Positioning bolt;

[0036] 4. Locking buckle; 41. Locking part;

[0037] 101. Inner shell; 102. Door. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In the description of this application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] like Figure 1 and Figure 2 As shown, this embodiment of the present invention first provides a door opening device for a dishwasher. The door opening device includes a hinge support 142 and a rotating hinge 141 hinged to the hinge support 142. The rotating hinge 141 is installed on the door body 102 of the dishwasher and can rotate with the door body 102; the hinge support 142 is installed on the inner shell 101.

[0043] The door opening device also includes a magnetic component 12, a magnetic induction component, and a PCB board 21. The magnetic component 12 is mounted on a magnet mounting base 11, which is located on a rotating hinge 141 and can rotate with the hinge 141. During rotation, the magnet mounting base 11 drives the magnetic component 12 to rotate, causing the magnetic poles to rotate. The magnet mounting base 11 has a first limiting structure to constrain the magnetic pole direction of the magnetic component 12, ensuring the accuracy and consistency of the magnetic pole direction when the door is closed. The magnetic induction component is located on a hinge support 142 and is used to detect the magnetic pole direction of the magnetic component 12. The magnetic induction component can sense changes in the magnitude and direction of the magnetic field of the magnetic component 12 and convert them into electrical signals for transmission. Simultaneously, the first limiting structure ensures the consistency and accuracy of the magnetic pole direction when the door is closed, preventing relative movement between the magnet mounting base 11 and the magnetic component 12 during the rotation of the hinge 141, which could affect the magnetic pole direction and thus the sensing accuracy of the magnetic induction component. PCB board 21 is disposed on hinge support 142 and is electrically connected to magnetic induction element. Based on the electrical signal converted from the change of magnetic pole direction detected by magnetic induction element, the rotation angle and / or rotation speed and / or rotation acceleration of magnetic element 12 are obtained, thereby obtaining information such as the real-time position of rotating hinge 141, opening and closing speed of rotating hinge 141, and opening and closing acceleration of rotating hinge 141. This facilitates the door opening device to detect abnormal opening and closing states of rotating hinge 141 in a timely manner and improves the safety of door opening device.

[0044] The magnetic induction element can be a magnetic sensor; the specific structure and working principle of the PCB board 21 and the magnetic induction element can be set with reference to the existing technology, which is not the focus of this application and will not be described in detail in this embodiment.

[0045] Specifically, the first limiting structure includes a limiting protrusion 131 and a limiting groove 132 that can be engaged with each other. One of the limiting protrusion 131 and the limiting groove 132 is disposed on the magnet mounting base 11, and the other is disposed on the magnetic component 12, thereby realizing relative movement between the magnet mounting base 11 and the magnetic component 12.

[0046] In one embodiment, such as Figure 3 As shown, the magnetic component 12 is a circular sheet, and a limiting groove 132 is formed on the magnetic component 12. Compared with setting a protrusion, the magnetic component 12 is easier to perform grooving. The depth of the limiting groove 132 extends radially along the magnetic component 12, and the magnetic south pole and magnetic north pole of the magnetic component 12 are symmetrically located on both sides of the limiting groove 132, forming a more uniform magnetic field and improving the sensing sensitivity of the magnetic induction component.

[0047] The magnet mounting base 11 has a mounting groove 111 and a baffle 112 surrounding the mounting groove 111. A limiting protrusion 131 is disposed on the inner side of the baffle 112, and a limiting slot 132 is formed on the side edge of the magnetic component 12. The magnetic component 12 can be easily embedded in the mounting groove 111, and the limiting protrusion 131 is engaged in the limiting slot 132, making the installation between the magnetic component 12 and the magnet mounting base 11 relatively convenient.

[0048] like Figure 4 As shown, to further limit the magnetic component 12, the magnet mounting base 11 also includes a plurality of limiting buckles 113 disposed on the edge of the mounting groove 111. The buckling ends of the limiting buckles 113 extend toward the center of the mounting groove 111 to constrain the magnetic component 12 from disengaging from the mounting groove 111. When the magnetic component 12 is installed toward the mounting groove 111, the edge of the magnetic component 12 pushes against the limiting buckles 113, causing them to deform and avoid the magnetic component 12; after the magnetic component 12 is engaged in the mounting groove 111, the limiting buckles 113 return to their initial state, thus constraining the magnetic component 12 from disengaging from the mounting groove 111.

[0049] The magnet mounting base 11 has a circular outer contour, and a fixing groove 1411 is provided on the rotating hinge 141, in which the magnet mounting base 11 is embedded. To prevent the magnet mounting base 11 from rotating relative to the rotating hinge 141, the door opening device also includes a rotation limiting member 3, one end of which is detachably connected to the magnet mounting base 11, and the other end is detachably connected to the rotating hinge 141.

[0050] Exemplarily, in one embodiment, for ease of assembly and disassembly, such as Figure 4 As shown, the rotation limiting member 3 is a plate-shaped member, and a positioning bolt 31 perpendicular to the plate-shaped member is provided at one end. The magnet mounting base 11 has a slot on its side, and the rotation hinge 141 has an insertion hole. When the magnet mounting base 11 is embedded in the fixing groove 1411, one end of the rotation limiting member 3 is inserted into the insertion hole, and the positioning bolt 31 at the other end is inserted into the insertion hole, thereby restricting the rotation of the circular magnet mounting base 11 within the fixing groove 1411.

[0051] To facilitate the installation of the magnet mounting base 11, the fixing groove 1411 extends to the edge of the rotating hinge 141 to form a mounting notch 1412, such as Figure 5 As shown. The magnet mounting base 11 can be snapped into the fixing groove 1411 through the mounting notch 1412, improving the ease of installation. In order to prevent the magnet mounting base 11 from slipping out of the mounting notch 1412, the door opening device also includes a locking buckle 4, which can be engaged at the mounting notch 1412 to prevent the magnet mounting base 11 from falling out of the fixing groove 1411.

[0052] For example, a snap-fit ​​groove 115 is provided on the side of the magnet mounting base 11 facing away from the mounting groove 111. The magnet mounting base 11 is snapped into the fixing groove 1411 via the mounting notch 1412. The groove wall of the snap-fit ​​groove 115 is snapped into both sides of the rotating hinge 141 to restrict the axial movement of the magnet mounting base 11. Both sides of the mounting notch 1412 have extension notches 1413 communicating with the mounting notch 1412. The mounting notch 1412 and the extension notch 1413 are set at an angle. The locking buckle 4 is embedded in the mounting notch 1412. The locking part 41 of the locking buckle 4 can be inserted into the extension notch 1413 to realize the locking of the locking buckle 4 and the rotating hinge 141, thereby restricting the magnet mounting base 11.

[0053] like Figure 6 and Figure 7 As shown, to better handle changes in the magnetic field angle, the hinge axis of the rotating hinge 141 and the magnetic element 12 are concentrically arranged, and the magnetic induction element is disposed on the hinge support 142. Furthermore, the magnetic induction element and the magnetic element 12 are arranged sequentially along the extension direction of the hinge axis. Thus, when the rotating hinge 141 rotates, the magnetic element 12 only rotates relative to the magnetic induction element, and the magnetic field does not move (see reference). Figure 1 and Figure 2 The rotation of the magnetic pole direction alone reduces interference with the detection of the magnetic induction device, allowing it to better handle changes in the magnetic field angle.

[0054] To ensure rotational stability between the rotating hinge 141 and the hinge support 142, the door opening device also includes a rotating support shaft 143. The rotating hinge 141 and the hinge support 142 are spaced apart. The magnet mounting base 11 has an axially penetrating connecting hole 114. One end of the rotating support shaft 143 is connected to the hinge support 142, and the other end rotatably passes through the connecting hole 114. The rotating support shaft 143 provides support and axial positioning, maintaining a certain gap between the rotating hinge 141 and the hinge support 142 to avoid rotational friction. Furthermore, the axial position of the magnetic component 12 remains stable and does not change, reducing interference with the detection of the magnetic sensing component.

[0055] The magnetic induction element is mounted on the PCB board 21 to facilitate electrical signal transmission between the magnetic induction element and the PCB board 21. The PCB board 21 is connected to the PCB board mounting bracket 22, such as... Figure 5 As shown, the PCB board mounting bracket 22 is detachably connected to the side of the hinge bracket 142 opposite to the rotating hinge 141, avoiding interference with the rotation between the rotating hinge 141 and the hinge bracket 142. The PCB board 21 is mounted on the hinge bracket 142 via the PCB board mounting bracket 22. While the magnetic component 12 rotates with the rotating hinge 141, the PCB board 21 remains stationary, preventing interference with the magnetic sensing component.

[0056] The present invention also provides a dishwasher, such as... Figure 8 As shown, the dishwasher includes the door opening device as described above. The dishwasher also includes an inner tub housing 101 and a door 102 rotatably connected to the inner tub housing 101. A hinge support 142 for the door opening device is provided on the inner tub housing 101, and a rotating hinge 141 for the door opening device is provided on the door 102.

[0057] A first limiting structure is provided between the magnet mounting base 11 and the magnetic component 12 of the door opening device to constrain the magnetic pole direction of the magnetic component 12. The magnet mounting base 11 is mounted on the rotating hinge 141 and can rotate with the door body 102 to cause the magnetic pole to rotate. The first limiting structure ensures the accuracy and consistency of the magnetic pole direction in the initial state. A magnetic induction element is provided on the hinge support 142 and is used to detect the magnetic pole direction of the magnetic component 12. The magnetic induction element can sense the magnitude and direction changes of the magnetic field of the magnetic component 12 and convert them into electrical signals for transmission. At the same time, the first limiting structure ensures the consistency and accuracy of the magnetic pole direction of the magnetic component 12 in the closed state, preventing relative movement between the magnet mounting base 11 and the magnetic component 12 during the rotation of the rotating hinge 141, which would affect the magnetic pole direction and the sensing accuracy of the magnetic induction element. The PCB board 21 is located on the hinge support 142 and is electrically connected to the magnetic induction element. Based on the electrical signal generated by the change in the direction of the magnetic pole detected by the magnetic induction element, the rotation angle and / or rotation speed and / or rotation acceleration of the magnetic element 12 are obtained. This allows information such as the real-time position of the rotating hinge 141, the opening and closing speed of the rotating hinge 141, and the opening and closing acceleration of the rotating hinge 141 to be obtained. This facilitates the door opening device to detect abnormal states of the door 102 in a timely manner, thereby improving the safety and reliability of the dishwasher's door opening and closing operation.

[0058] The control method for opening and closing the dishwasher using the door opening device in this embodiment is as follows:

[0059] 1. When the magnetic sensor detects an opening angle, it determines that the door is open.

[0060] 2. When the door opening acceleration is greater than the set acceleration, PCB board 21 will activate the alarm function to indicate that the door opening is abnormal. The door opening acceleration is much greater than the set acceleration, which indicates that there is a risk of door failure or automatic door opening and closing component failure.

[0061] 3. For dishwashers equipped with an automatic door opening and closing device, the automatic door closing action is initiated when the door 102 is open for a duration T1 greater than the preset dwell time T. If the door 102 is open for too long, manual closing may be obstructed.

[0062] 4. For dishwashers with an automatic door opening and closing device, when the door 102 opens, if the preset angular velocity minus the opening angular velocity is greater than the set constant value, the automatic door closing action will be executed. If the opening angular velocity is too small, it indicates that the door 102 is obstructed from opening. The automatic door closing action is executed to prevent damage to the dishwasher parts caused by obstacles when the door is opened.

[0063] 5. For dishwashers with an automatic door closing mechanism, when the automatic door closing action is executed, if the preset angular velocity minus the closing angular velocity is greater than the set constant value, the automatic door closing action is stopped. After the set pause time is reached, the door closing action is executed again. At this time, the closing angular velocity is checked again. If the preset angular velocity minus the closing angular velocity is greater than the set constant value, the door closing action is stopped again. This cycle is repeated until N checks are performed, at which point the automatic door closing action stops. Afterward, the system can wait for user operation to prevent fingers or tableware from being trapped during automatic door closing, thus improving the user experience.

[0064] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0065] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A door opening device for a dishwasher, comprising a hinge support (142) and a rotating hinge (141) hinged to said hinge support (142), characterized in that, Also includes: A magnetic component (12) is disposed on a magnet mounting base (11), the magnet mounting base (11) is disposed on the rotating hinge (141), and the magnet mounting base (11) has a first limiting structure to constrain the magnetic pole direction of the magnetic component (12); A magnetic induction element is provided on the hinge support (142), and the magnetic induction element is used to detect the magnetic pole direction of the magnetic element (12); A PCB board (21) is disposed on the hinge support (142) and electrically connected to the magnetic induction element, for obtaining the rotation angle and / or rotation speed and / or rotation acceleration of the magnetic element (12) according to the change of magnetic pole direction detected by the magnetic induction element.

2. The door opening device according to claim 1, characterized in that, The first limiting structure includes a limiting protrusion (131) and a limiting groove (132) that can be engaged with each other. One of the limiting protrusion (131) and the limiting groove (132) is disposed on the magnet mounting base (11), and the other is disposed on the magnetic component (12).

3. The door opening device according to claim 2, characterized in that, The magnetic component (12) is a circular sheet. The limiting slot (132) is formed on the magnetic component (12). The depth of the limiting slot (132) extends radially along the magnetic component (12). The magnetic south pole and magnetic north pole of the magnetic component (12) are symmetrically located on both sides of the limiting slot (132).

4. The door opening device according to claim 2, characterized in that, The magnet mounting base (11) has a mounting groove (111) and a baffle (112) surrounding the mounting groove (111). The limiting protrusion (131) is disposed on the inner side of the baffle (112). The limiting slot (132) is opened on the side edge of the magnetic component (12). The magnetic component (12) is embedded in the mounting groove (111) so that the limiting protrusion (131) is engaged in the limiting slot (132).

5. The door opening device according to claim 4, characterized in that, The magnet mounting base (11) also includes a plurality of limiting buckles (113) disposed on the edge of the mounting groove (111), the buckling ends of the limiting buckles (113) extending toward the center of the mounting groove (111) to constrain the magnetic component (12) from the mounting groove (111).

6. The door opening device according to claim 1, characterized in that, The outer contour of the magnet mounting base (11) is circular. The rotating hinge (141) has a fixing groove (1411) and the magnet mounting base (11) is embedded in the fixing groove (1411). The door opening device also includes a rotation limiting member (3). One end of the rotation limiting member (3) is detachably connected to the magnet mounting base (11) and the other end is detachably connected to the rotating hinge (141).

7. The door opening device according to claim 6, characterized in that, The fixing groove (1411) extends to the edge of the rotating hinge (141) to form a mounting notch (1412), and the magnet mounting base (11) can be engaged in the fixing groove (1411) through the mounting notch (1412). The door opening device also includes a locking buckle (4), which can be engaged at the mounting notch (1412) to prevent the magnet mounting base (11) from disengaging from the fixing groove (1411).

8. The door opening device according to claim 1, characterized in that, The hinge axis of the rotating hinge (141) and the magnetic element (12) are concentrically arranged. The magnetic induction element is disposed on the hinge support (142) and is arranged sequentially along the extension direction of the hinge axis.

9. The door opening device according to claim 8, characterized in that, The door opening device further includes a rotating support shaft (143), the rotating hinge (141) and the hinge support (142) are spaced apart, the rotating hinge (141) has a through fixing groove (1411), the magnet mounting base (11) is embedded in the fixing groove (1411), the magnet mounting base (11) has a through connecting hole (114) along the axial direction, one end of the rotating support shaft (143) is connected to the hinge support (142), and the other end is rotatably inserted into the connecting hole (114); and / or, The magnetic induction element is disposed on the PCB board (21), the PCB board (21) is connected to the PCB board mounting bracket (22), and the PCB board mounting bracket (22) is detachably connected to the hinge bracket (142) on the side opposite to the rotating hinge (141).

10. A dishwasher, characterized in that, The device includes the door opening device as described in any one of claims 1-9, and further includes an inner shell (101) and a door body (102) rotatably connected to the inner shell (101), wherein the hinge support (142) of the door opening device is provided on the inner shell (101), and the rotating hinge (141) of the door opening device is provided on the door body (102).

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