CN215191358U - Door opening and closing mechanism and dish washing machine using same - Google Patents

Abstract

The utility model discloses a door opening and closing mechanism and a dish washing machine using the door opening and closing mechanism, which comprises a rack, a power component and a sensing component, wherein one end of the rack is connected with a door body so as to be suitable for pushing and pulling the door body, the power component is connected with the rack so as to drive the rack to do linear reciprocating motion, and the sensing component is arranged beside the rack and is suitable for being in contact fit with the door body; the sensing assembly comprises a push rod, an elastic body and a first sensing element, wherein one end of the push rod is suitable for being in contact fit with the door body when the door body is closed, the elastic body is connected with one end, away from the door body, of the push rod, and the first sensing element is arranged beside the push rod and is suitable for being triggered by the push rod when the door body is opened. The utility model discloses can effectively learn the door body and open and the closure state.

Description

Door opening and closing mechanism and dish washing machine using same

Technical Field

The utility model relates to the technical field of household appliances, especially, relate to a switching door mechanism and use dish washer of this switching door mechanism.

Background

Some dish washing machines in the existing market have the function of an automatic sliding door, but the automatic sliding door products in the existing market do not have the function of directly detecting or judging whether the door is completely closed or not. No matter the dishwasher sliding door component products on the market at present are in a mode of detecting motor locked-rotor current or detecting a signal given by triggering of a travel switch, the dishwasher sliding door component products only can detect and judge whether a rack in the sliding door component runs in place or not, and accordingly judge whether the rack completely extends out (pushes a door open) or retracts (pulls the door back to close), and the monitoring and judging mode is easy to generate the situation of misjudgment under abnormal conditions. Such as: there is the foreign matter between dish washer hatch door and the dish washer fuselage, and the rack is toward retrieving, and the influence that is blocked by the foreign matter produces the locked rotor, and the locked rotor current that well accuse computer board detected the motor can make the hatch door closed wrong judgement. Or in the process that the rack pulls the dishwasher door back, foreign matters are clamped between the dishwasher door and the dishwasher body, so that the rack of the push-pull door assembly is separated from the dishwasher door, the rack is normally retracted and triggers the travel switch, and the central control computer board can wrongly determine that the dishwasher door is normally closed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a first purpose provides an on-off door mechanism to solve and effectively learn the technical problem that the door body was opened and the closure state.

The second purpose of the utility model is to provide a dish washer to solve and effectively learn the technical problem that the door body was opened and the closed state.

The utility model discloses a switch door mechanism realizes like this:

an opening and closing door mechanism comprising: the door body comprises a rack, a power assembly and a sensing assembly, wherein one end of the rack is connected with the door body so as to be suitable for pushing and pulling the door body, the power assembly is connected with the rack so as to drive the rack to do linear reciprocating motion, and the sensing assembly is arranged beside the rack and is suitable for being in contact fit with the door body; wherein

The sensing assembly comprises a push rod, an elastic body and a first sensing element, wherein one end of the push rod is suitable for being in contact fit with the door body when the door body is closed, the elastic body is connected with one end, away from the door body, of the push rod, and the first sensing element is arranged beside the push rod and is suitable for being triggered by the push rod when the door body is opened.

In a preferred embodiment of the present invention, the door opening and closing mechanism further comprises an outer housing adapted to accommodate and load the sensing assembly, the power assembly and the rack; wherein

The end part of the rack connecting door body extends out of the outer shell; and

the end part of the ejector rod far away from the elastic body extends out of the outer shell body to be suitable for being in contact fit with the door body.

In an alternative embodiment of the present invention, the first sensing element and the rack are respectively located on both sides of the carrier rod.

In a preferred embodiment of the present invention, the post rod includes a rod body extending in the front-rear direction and a trigger head integrally formed with an end portion of the rod body; wherein

The other end of the rod body, which is far away from the trigger head, is suitable for being in contact fit with the door body;

the trigger head is connected with the elastic body and is suitable for triggering the first sensing element; and

the end face of the trigger head facing the first sensing element protrudes out of the end face of the rod body facing the first sensing element.

In the preferred embodiment of the present invention, the end of the trigger head connected to the rod body is provided with a chamfer buffer surface.

In a preferred embodiment of the present invention, the trigger head is fixedly connected to the elastic body; or

The trigger head is in contact fit with the elastic body.

In a preferred embodiment of the present invention, a convex triggering portion is disposed on a side surface of the end portion of the rack away from the door body; and

and a second sensing element which is suitable for being triggered by the triggering part when the door body is closed is also arranged in the outer shell and on one side of the rack, which is provided with the triggering part.

In the preferred embodiment of the present invention, a third sensing element suitable for being triggered by the triggering portion when the door body is completely opened is further disposed in the outer shell and on the side of the rack where the triggering portion is disposed.

In a preferred embodiment of the present invention, the power assembly includes a power generation portion and a reduction gear unit connected to the power generation portion;

the power generation part comprises a motor and a worm fixedly connected with the motor;

the reduction gear unit comprises a power gear connected with the worm, at least one stage of transmission gear connected with the power gear, and an output gear meshed and connected with a transmission gear at the last stage;

and a tooth-shaped part which is suitable for being meshed and connected with the output gear is arranged on the side end surface of the rack which is contacted with the output gear.

The utility model discloses dish washer realizes like this:

a dishwasher comprises the door opening and closing mechanism.

By adopting the technical scheme, the utility model discloses following beneficial effect has: the utility model discloses a dish washer of switch door mechanism and use this switch door mechanism, through be equipped with when the door body is closed with a body contact complex ejector pin, and be equipped with in order to be suitable for the first sensing element that is triggered by the ejector pin when the door body is opened at the ejector pin side. Under such structure, can learn the open-close state of the door body in real time through the cooperation of ejector pin and first sensing element at the in-process that the door body was opened and is closed, specifically, under the state that the door body was in to open, the push-up force of the door body to the ejector pin disappears, and the ejector pin can stretch out to door body one side under the effect of elastomer this moment, and under this condition, the ejector pin triggers first sensing element, so both accessible first sensing element's signal learn the state that the door body is in to open. And when the door body is completely closed in place, the door body pushes the ejector rod, the elastic body is compressed at the moment, the ejector rod retracts towards one side of the spring body, under the condition, the ejector rod releases the trigger between the first sensing elements, at the moment, the first sensing elements cannot be triggered, and the trigger signal cannot be generated, so that the condition that the door body is closed in place can be known through the condition that the first sensing elements are not triggered.

Drawings

Fig. 1 is a schematic view of the overall structure of the door opening and closing mechanism of the present invention;

fig. 2 is a schematic view of the push rod of the door opening and closing mechanism of the present invention;

fig. 3 is a schematic view of a sensing assembly of the door opening and closing mechanism of the present invention;

fig. 4 is a schematic view of the rack of the door opening and closing mechanism according to the present invention in a fully retracted state;

fig. 5 is a schematic view of the rack of the door opening and closing mechanism of the present invention in a fully and semi-extended state;

fig. 6 is a schematic view of the utility model discloses a rack of the switching door mechanism is in the state of fully stretching out.

In the figure: the device comprises a rack 1, a triggering part 11, an outer shell 2, a motor 3, a worm 4, a power gear 5, a transmission gear 6, an output gear 7, a push rod 8, a rod body 81, a triggering head 82, an elastic body 9, a first microswitch 101, a second microswitch 102, a third microswitch 103 and a contact 104.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

Example 1:

referring to fig. 1 to 6, the present embodiment provides a door opening and closing mechanism, which is suitable for an electric appliance requiring an automatic sliding door, such as but not limited to a dishwasher. Specifically, the door opening and closing mechanism of the present embodiment includes: one end of the rack is connected with the door body to be suitable for pushing and pulling the rack 1 of the door body, the power component is connected with the rack 1 to drive the rack 1 to do linear reciprocating motion, and the sensing component is arranged beside the rack 1 and is suitable for being in contact fit with the door body.

It should be noted that the door opening and closing mechanism of the present embodiment further includes an outer housing 2 adapted to accommodate the loading sensing assembly, the power assembly and the rack 1; wherein, the end part of the rack 1 connected with the door body extends out of the outer shell 2; and the end of the ejector rod 8 far away from the elastic body 9 extends out of the outer shell 2 to be suitable for contact fit with the door body. That is, openings are provided on the side wall of the outer casing 2 to allow the rack 1 and the plunger 8 to extend out of the outer casing 2, respectively.

Referring next to the power assembly, which includes a power generation portion and a reduction gear unit connected to the power generation portion, an alternative embodiment is illustrated in conjunction with the drawings of the present embodiment. The power generation part comprises a motor 3 and a worm 4 fixedly connected with the motor 3. The reduction gear unit comprises a power gear 5 connected with the worm 4, a transmission gear 6 connected with at least one stage of transmission connected with the power gear 5, and an output gear 7 meshed and connected with the transmission gear 6 at the last stage; a tooth-shaped part M suitable for being meshed and connected with the output gear 7 is arranged on the side end surface of the rack 1 contacted with the output gear 7.

Here, the reduction gear unit of the present embodiment may be a plurality of transmission gears 6 that are meshed and connected, or may be a planetary reduction mechanism structure that is integrated with the power generation unit, and the present embodiment is not limited thereto.

In other words, the sensing component adopted in this embodiment includes a push rod 8 having one end adapted to be in contact with the door body when the door body is closed, an elastic body 9 connected to one end of the push rod 8 away from the door body, and a first sensing element disposed beside the push rod 8 and adapted to be triggered by the push rod 8 when the door body is opened. The first sensing element here is for example but not limited to a first microswitch 101, i.e. the triggering of the first microswitch 101 is brought about by the contact of the plunger 8 with the contact 104 on the first microswitch 101. The elastic body 9 is, for example, but not limited to, a spring, one end of which is connected to the top rod 8, and the other end of which is fixed in the outer housing 2.

The specific implementation principle of the sensing assembly of the present embodiment is as follows:

under the condition that the door body is closed, the door body generates jacking acting force on the ejector rod 8, under the jacking acting force, the ejector rod 8 compresses the elastic body 9, the elastic body 9 is in a compressed state, and the ejector rod 8 does not generate triggering action on the first sensing element at the moment.

And in the process that the door body is opened, the rack 1 is driven by the power assembly to push the door body outwards the outer shell 2, the door body is gradually far away from the ejector rod 8, at the moment, the ejector rod 8 is separated from the jacking acting force of the door body, under the elastic action of the elastic body 9, the ejector rod 8 extends out towards one side of the door body, and in the process that the ejector rod 8 moves, the ejector rod 8 triggers the first sensing element, so that the first sensing element is triggered to send a signal.

It should be noted that, for the ejector rod 8 of the present embodiment, the ejector rod 8 is disposed beside the rack 1, and in an optional implementation case, the ejector rod 8 is disposed in parallel with the rack 1, and such a disposition position can effectively ensure that the ejector rod 8 moves in time along with the movement of the door body for a structure that the door body is opened and closed by horizontally pushing the door body by the rack 1.

In detail, when the door body is closed, the plunger 8 does not contact the contact 104 of the first microswitch 101, that is, the first microswitch 101 is not triggered. In the process of opening the door body, the ejector rod 8 keeps contact with the contact 104 on the first microswitch 101, the opening of the door body at the position specifically comprises the whole process from the moment that the door body is released from the closed state to the moment that the door body is completely opened, namely, the first microswitch 101 at the position cannot be triggered only when the door body is in the closed state, and then whether the door body is in the closed state or not can be known through the trigger state of the first microswitch 101.

Referring to the drawings, as an example of an alternative implementation, the first microswitch 101 and the rack 1 are respectively located at two sides of the top bar 8, so that the operation of the rack 1 and the first microswitch 101 are not interfered with each other, and the internal space of the outer shell 2 can be effectively utilized. It should be noted that, the first microswitch 101 and the rack 1 here may also be located at the same side of the ejector 8, that is, the first microswitch 101 is disposed between the rack 1 and the ejector 8, that is, the use requirement of the embodiment is met as long as the condition that the work of the rack 1 and the work of the first microswitch 101 are not interfered with each other can be ensured. Therefore, the drawing of the present embodiment is merely exemplified by the case where the first microswitch 101 and the rack 1 are respectively located on both sides of the jack 8.

The ram 8 adopted in the present embodiment has the following specific structure: the post rod 8 comprises a rod body 81 extending along the front-back direction and a trigger head 82 integrally formed with one end part of the rod body 81; the other end of the rod body 81 far away from the trigger head 82 is suitable for being in contact fit with the door body; and the trigger head 82 is connected to the elastic body 9 and is adapted to trigger the first microswitch 101. It should be noted that, here, the end surface of the trigger head 82 facing the first micro switch 101 protrudes from the end surface of the rod 81 facing the first micro switch 101, and the significance of the design is that as the push rod 8 moves in the process of extending and retracting relative to the outer shell 2, the rod 81 of the push rod 8 does not generate a triggering effect on the first micro switch 101, and only the trigger head 82 can trigger the first micro switch 101.

In addition to the above structure, in an alternative implementation, as shown in the drawing of the present embodiment, the trigger head 82 and the lever 81 are both of a regular shape, and the width dimension of the trigger head 82 is greater than that of the lever 81, so that the push rod 8 keeps a certain distance from the contact 104 of the first microswitch 101 during the process of extending or retracting relative to the outer casing 2. During the movement of the push rod 8, the trigger head 82 can contact the contact 104 of the first microswitch 101 to trigger the first microswitch 101 when the push rod 8 moves to a certain position interval. In an alternative embodiment, the overall width of the trigger head 82 is smaller than or equal to the width of the lever 81, the end surface of the trigger head 82 away from the first micro-switch 101 is concave relative to the end surface of the lever 81 away from the first micro-switch 101, and only the end surface of the trigger head 82 facing downwards of the first micro-switch 101 is convex relative to the end surface of the lever 81 facing towards the first sensing element, so as to contact with the contact 104 of the first micro-switch 101. Therefore, the two optional implementation cases described above both meet the use requirements of the present embodiment.

With regard to the ram 8 of the present embodiment, it should be further noted that the trigger head 82 of the ram 8 may be fixedly connected to the elastic body 9, in which case, a direct mechanical connection relationship exists between the ram 8 and the elastic body 9; or the trigger head 82 can be in contact fit with the elastic body 9, that is, there is no direct mechanical connection relationship between the push rod 8 and the elastic body 9, and only the contact fit relationship exists. This embodiment is not absolutely limited.

Because in the process that the door body is opened, the contact 104 of the first microswitch 101 keeps continuous contact with the trigger head 82 of the ejector rod 8, when the door body is closed, the contact 104 of the first microswitch 101 is positioned at the side of the junction of the rod body 81 of the ejector rod 8 and the trigger head 82, so that when the door body is switched from closed to open, the door body moves, and when the ejector rod 8 begins to extend out to one side of the door body, the contact 104 of the first microswitch 101 can begin to generate contact with the trigger head 82 to be triggered. In the process, considering that during the movement of the push rod 8, the position of the contact 104 of the first micro switch 101 corresponding to the push rod needs to be switched from the rod 81 part to the trigger head 82 part, in order to improve the smoothness of the contact 104 of the first micro switch 101 switched from the corresponding rod 81 part to the corresponding trigger head 82 part to contact with the trigger head 82, the embodiment is provided with a chamfer buffer surface K at the end of the engagement between the trigger head 82 and the rod 81, and with such a structure, the first micro switch 101 can be switched smoothly from the non-contact state with the rod 81 to the contact state with the trigger head 82 through the chamfer buffer surface K.

Finally, regarding the door opening and closing mechanism of the present embodiment, besides the opening and closing state of the door body can be known by the first sensing element, the opening and closing condition of the door body can be assisted and judged by the movement position of the rack 1. Specifically, in an alternative implementation case, a convex triggering part 11 is arranged on the side surface of the end part of the rack 1 far away from the door body; and a second sensing element which is suitable for being triggered by the triggering part 11 when the door body is closed is further arranged in the outer shell 2 and on one side of the rack 1, which is provided with the triggering part 11. The second sensing element here is, for example and without limitation, a second microswitch 102, and when the rack 1 is in a fully retracted state, the triggering portion 11 on the rack 1 can trigger the second microswitch 102 to indicate that the rack 1 has been retracted to the right position, and when the rack 1 is operating normally and without being stuck, the situation is used to indicate that the door body is closed to the right position.

In addition, optionally, a third sensing element which is suitable for being triggered by the triggering portion 11 when the door body is fully opened is further arranged in the outer shell 2 and on the side of the rack 1 where the triggering portion 11 is arranged. The third sensing element here is, for example and without limitation, a third microswitch 103, and when the rack 1 is in a fully extended state, the triggering portion 11 on the rack 1 can trigger the third microswitch 103 to indicate that the rack 1 has been extended in place, and when the rack 1 is operating normally without being stuck, it indicates that the door body has been completely opened.

Of course, it should be noted that, the second sensing element and the third sensing element of the present embodiment may exist at the same time, or only one of them may be provided, which is not limited to this embodiment.

The specific operating principle for the door opening and closing mechanism of the present embodiment when used in a dishwasher is as follows:

the door opening and closing mechanism is integrally arranged in the dish washing machine, and the motor 3 drives the rack 1 to stretch out and return to push and pull the door body of the dish washing machine.

As shown in fig. 4, the rack 1 of the sliding door of the dishwasher is in a recovery state, that is, the door of the dishwasher is in a closed state, and the push rod 8 and the rack 1 both retract to be located at the innermost side of the outer shell 2; and the trigger part 11 on the rack 1 contacts with the contact 104 of the second microswitch 102, indicating that the rack 1 is retracted to the position. When the door body is closed, the door body pushes the push rod 8 towards one side of the outer shell 2, the elastic body 9 is compressed towards one side far away from the door body, and at the moment, the whole push rod 8 is not contacted with the contact 104 of the first microswitch 101, which indicates that the door body of the dish-washing machine is closed in place. To sum up, that is, by the conduction of the second microswitch 102 and the non-conduction state of the first microswitch 101, it can be said that the rack 1 and the push rod 8 are both located at the innermost side of the outer shell 2, and therefore it can be determined that: the rack 1 is not abnormal in the withdrawing process, and the door body of the dish washing machine is not abnormal in the closing process and is completely closed.

Fig. 5 shows that the rack 1 of the sliding door of the dishwasher is in a half-extended state, that is, the door body of the dishwasher is in a half-opened state, at this time, the trigger portion 11 of the rack 1 is not in contact with the second micro switch 102 and the third micro switch 103, that is, the trigger portion 11 of the rack 1 is located between the second micro switch 102 and the third micro switch 103; the ejector rod 8 is not jacked by the door body, the spring is in a release state, the spring pushes the ejector rod 8 to the outermost side of the outer shell 2, and in the process, the trigger head 82 of the ejector rod 8 is in contact with the contact 104 of the first microswitch 101, so that the first microswitch 101 is in a conduction state; in this state, even if the dishwasher is suddenly powered off, the open/close state of the door can be judged.

Fig. 6 shows that when the rack 1 of the sliding door of the dishwasher is in a fully extended state, i.e. the door of the dishwasher is in a fully opened state, the contact 104 of the second microswitch 102 is not in contact with the trigger portion 11 of the rack 1, i.e. the second microswitch 102 is in a non-conducting state; the trigger part 11 of the rack 1 is contacted with the contact 104 of the third microswitch 103, and the third microswitch 103 is in a conducting state; at the moment, the spring is in a release state, the ejector rod 8 is in a complete extension state, the trigger head 82 on the ejector rod 8 is in contact with the contact 104 of the first microswitch 101, and the first microswitch 101 is in a conduction state; in summary, at this time, when both the first micro switch 101 and the third micro switch 103 are in the on state, it is determined that the door is in the fully open state.

Example 2:

on the basis of the door opening and closing mechanism of embodiment 1, the present embodiment provides a dishwasher including the door opening and closing mechanism of embodiment 1.

The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above embodiments are only examples of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the mechanism or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims (10)

1. A door opening and closing mechanism, comprising: the door body comprises a rack, a power assembly and a sensing assembly, wherein one end of the rack is connected with the door body so as to be suitable for pushing and pulling the door body, the power assembly is connected with the rack so as to drive the rack to do linear reciprocating motion, and the sensing assembly is arranged beside the rack and is suitable for being in contact fit with the door body; wherein

The sensing assembly comprises a push rod, an elastic body and a first sensing element, wherein one end of the push rod is suitable for being in contact fit with the door body when the door body is closed, the elastic body is connected with one end, away from the door body, of the push rod, and the first sensing element is arranged beside the push rod and is suitable for being triggered by the push rod when the door body is opened.

2. The opening and closing mechanism of claim 1, further comprising an outer housing adapted to house said sensing assembly, power assembly and rack gear; wherein

The end part of the rack connecting door body extends out of the outer shell; and

the end part of the ejector rod far away from the elastic body extends out of the outer shell body to be suitable for being in contact fit with the door body.

3. The door opening and closing mechanism according to any one of claims 1 or 2, wherein the first sensing element and the rack are respectively located on both sides of the carrier rod.

4. The door opening and closing mechanism according to any one of claims 1 or 2, wherein the push rod includes a rod body extending in a front-rear direction and a trigger head integrally formed with one end portion of the rod body; wherein

The other end of the rod body, which is far away from the trigger head, is suitable for being in contact fit with the door body;

the trigger head is connected with the elastic body and is suitable for triggering the first sensing element; and

the end face of the trigger head facing the first sensing element protrudes out of the end face of the rod body facing the first sensing element.

5. A switch door mechanism as claimed in claim 4, wherein a chamfered relief surface is provided at the end of the engagement of said trigger head with the lever body.

6. The switch door mechanism according to claim 4, wherein said trigger head is secured to an elastomer; or

The trigger head is in contact fit with the elastic body.

7. The door opening and closing mechanism according to claim 2, wherein a convex triggering part is arranged on the side surface of the end part of the rack far away from the door body; and

and a second sensing element which is suitable for being triggered by the triggering part when the door body is closed is also arranged in the outer shell and on one side of the rack, which is provided with the triggering part.

8. The door opening and closing mechanism according to claim 7, wherein a third sensing element adapted to be triggered by the triggering portion when the door body is fully opened is further provided in the outer housing at a side of the rack where the triggering portion is provided.

9. The door opening and closing mechanism according to claim 1, wherein the power assembly includes a power generation portion and a reduction gear unit connected to the power generation portion;

the power generation part comprises a motor and a worm fixedly connected with the motor;

the reduction gear unit comprises a power gear connected with the worm, a transmission gear connected with at least one stage of transmission connected with the power gear, and an output gear meshed and connected with the transmission gear at the last stage;

and a tooth-shaped part which is suitable for being meshed and connected with the output gear is arranged on the side end surface of the rack which is contacted with the output gear.

10. A dishwasher, comprising the door opening and closing mechanism according to any one of claims 1 to 9.

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