Cooking appliance, door locking device thereof, method of locking door, and method of detecting position of locking hook

Abstract

The application discloses a cooking utensil and a door locking device, a door locking method and a lock hook position detection method thereof. The door locking device adopts a step motor assembly to drive a locking end of a lock hook to swing, so that the locking end of the lock hook can hook or release a lock protrusion of a door. Compared with the existing door locking method which needs a synchronous motor to provide driving force, the step motor assembly of the door locking device is powered by low-voltage direct current, so that the door locking device does not need high-voltage protection treatment. Therefore, the cost of the door locking device can be reduced, and the safety of the door locking device can be improved, so that the safety hidden danger caused by electric leakage can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to a door lock, in particular to a cooking appliance and a door lock device thereof, a door locking method and a lock hook position detection method. BACKGROUND

[0002] A cooking appliance such as an oven is a common electrical appliance in daily life. During use, the cooking space of the cooking appliance usually has a high temperature, which is dangerous. Therefore, the cooking appliance needs to use a door lock to lock the door of the cooking appliance when it is in a working state, that is, the user is not allowed to open the door when the cooking appliance is in a working state, so as to prevent the user's limbs from being burned or scalded due to entering the cooking space of the cooking appliance. In other words, the door lock is one of the necessary configurations of the cooking appliance. Figure 1 A door lock of the prior art is shown, which includes a lock body 10P, a lock hook 20P, a transmission part 30P, a synchronous motor 40P and a plurality of micro switches 50P, the lock hook 20P is swingably mounted on the lock body 10P, the transmission part 30P is connected to the output shaft of the synchronous motor 40P and the lock hook 20P, and the micro switches 50P are respectively arranged on the lock body 10P and located near the transmission part 30P. When the mains power is supplied to the synchronous motor 40P, the output shaft of the synchronous motor 40P outputs power, the power is transmitted to the lock hook 20P through the transmission part 30P, and the lock hook 20P is driven to swing relative to the lock body 10P to allow the lock hook 20P to hook or release the lock protrusion of the door. In this process, the transmission part 30P triggers the micro switch 50P to determine whether the lock hook 20P swings to the designed position according to the signal generated by the micro switch 50P. The door lock of the prior art has many defects.

[0003] Firstly, the door lock requires multiple micro switches 50P to be installed on the lock body 10P, resulting in a complex structure and high cost of the door lock. Secondly, the micro switch 50P needs to be in a high-temperature environment for a long time, which causes the micro switch 50P to fail easily. Once the micro switch 50P fails, the door lock cannot determine whether the lock hook 20P swings to the designed position. Thirdly, the door lock is powered by the synchronous motor 40P. Since the synchronous motor 40P needs to be powered by mains, the mains voltage is relatively high, and the door lock needs to be protected against high voltage, resulting in a high cost of the door lock. In addition, if there is a leakage, it will be fatal to the user. Fourthly, when the synchronous motor 40P drives the lock hook 20P to swing through the transmission part 30P, the transmission part 30P triggers the micro switch 50P, and the door lock determines whether the lock hook 20P swings to the designed position according to the signal generated by the micro switch 50P. That is, as long as the transmission part 30P triggers the micro switch 50P, the door lock determines whether the lock hook 20P swings to the designed position, regardless of whether the lock hook 20P hooks or releases the lock protrusion of the door. However, in actual use, especially when the door lock needs to lock the door, if the lock protrusion of the door does not move to the corresponding position, for example, the door is not closed tightly, when the synchronous motor 40P drives the lock hook 20P to swing through the transmission part 30P to trigger the micro switch 50P, the cooking appliance will also have a result that the door lock locks the door. However, in fact, the door is not locked by the door lock, resulting in that the door may be opened by the user by mistake during the operation of the cooking appliance, which poses a great safety hazard to the user. SUMMARY

[0004] An object of the present application is to provide a cooking appliance and a door lock device, a door locking method and a lock hook position detection method thereof. The door lock device drives a locking end of a lock hook to swing by using a step motor assembly, so that the locking end of the lock hook can hook or release a lock protrusion of a door. Compared with the existing door lock that needs a synchronous motor to provide driving force, the step motor assembly of the door lock device is powered by low-voltage direct current, so that the door lock device does not need to be protected against high voltage. This not only reduces the cost of the door lock device, but also improves the safety of the door lock device and avoids the safety hazard caused by leakage.

[0005] An object of the present application is to provide a cooking appliance and a door lock device, a door locking method and a lock hook position detection method thereof. When the step motor assembly drives the locking end of the lock hook to swing through a rotating transmission element and a sliding transmission element, whether the lock hook reaches the target position can be determined by judging whether the step motor assembly is blocked, which makes the door lock device not need to be configured with a micro switch, thereby facilitating the simplification of the structure of the door lock device and the reduction of the cost of the door lock device.

[0006] It is an object of the present application to provide a cooking appliance and a door locking device, a door locking method and a lock hook position detection method thereof, wherein the door locking device of the present application does not need to be equipped with a micro switch, so that when designing the rotation transmission element, whether the rotation transmission element triggers the micro switch during rotation does not need to be considered, so that the design flexibility of the rotation transmission element can be improved, so that the stepper motor assembly can be away from the heat source of the cooking appliance, so that the stepper motor assembly can work in a low temperature environment, so as to facilitate prolonging the service life of the stepper motor assembly and improving the reliability of the stepper motor assembly.

[0007] It is an object of the present application to provide a cooking appliance and a door locking device, a door locking method and a lock hook position detection method thereof, wherein when the stepper motor assembly drives the locking end of the lock hook to swing, whether the stepper motor assembly is locked can be judged according to the current change value ΔI of adjacent time, which makes the door locking device of the present application not need to be equipped with a micro switch, so as to facilitate simplifying the structure of the door locking device and reducing the cost of the door locking device.

[0008] It is an object of the present application to provide a cooking appliance and a door locking device, a door locking method and a lock hook position detection method thereof, wherein when the stepper motor assembly drives the locking end of the lock hook to swing, whether the stepper motor assembly is locked can be judged according to whether the back electromotive force value when the pulse voltage input to the stepper motor assembly is 0 is 0, which makes the door locking device of the present application not need to be equipped with a micro switch, so as to facilitate simplifying the structure of the door locking device and reducing the cost of the door locking device.

[0009] According to an aspect of the present application, the present application provides a lock hook position detection method of a door locking device, wherein the lock hook position detection method comprises the following steps:

[0010] (I) input a pulse voltage to a stepper motor assembly to allow the stepper motor assembly to drive a lock hook to swing relative to a lock body;

[0011] (II) obtaining a back electromotive force value of the stepper motor assembly;

[0012] (III) judging whether the back electromotive force value when the pulse voltage is 0 is 0 to judge whether the stepper motor assembly is locked; and

[0013] (IV) confirming that the lock hook reaches a target position when the stepper motor assembly is locked.

[0014] According to one embodiment of the present application, in the step (IV), the input mode of the pulse voltage of the stepper motor assembly is used to determine whether the lock hook reaches a release target position, a lock target position, or an abnormal target position.

[0015] According to one embodiment of the present application, when the stepper motor assembly drives the lock hook to swing from the release target position to the lock target position, the number of pulses input to the stepper motor assembly is calculated. When the stepper motor assembly is locked, the number of input pulses is compared with a preset number of pulses. If the number of input pulses is consistent with the preset number of pulses, it is determined that the lock hook reaches the lock target position. If the number of input pulses is greater than the preset number of pulses, it is determined that the lock hook reaches the abnormal target position.

[0016] According to one embodiment of the present application, when the current value of the stepper motor assembly is greater than a preset critical current value, it is determined whether the stepper motor assembly is locked.

[0017] According to another aspect of the present application, the present application further provides a lock hook position detection method of a door lock device, wherein the lock hook position detection method comprises the following steps:

[0018] (A) inputting a pulse voltage to a stepper motor assembly to allow the stepper motor assembly to drive a lock hook to swing relative to a lock body;

[0019] (B) obtaining a current value of the stepper motor assembly;

[0020] (C) determining whether the stepper motor assembly is locked according to the current change value ΔI of adjacent times; and

[0021] (D) when the stepper motor assembly is locked, it is determined that the lock hook reaches a target position.

[0022] According to one embodiment of the present application, in the step (d), the input mode of the pulse voltage of the stepper motor assembly is used to determine whether the lock hook reaches a release target position, a lock target position, or an abnormal target position.

[0023] According to one embodiment of the present application, when the stepper motor assembly drives the lock hook to swing from the release target position to the lock target position, the number of pulses input to the stepper motor assembly is calculated. When the stepper motor assembly is locked, the number of input pulses is compared with a preset number of pulses. If the number of input pulses is consistent with the preset number of pulses, it is determined that the lock hook reaches the lock target position. If the number of input pulses is greater than the preset number of pulses, it is determined that the lock hook reaches the abnormal target position.

[0024] According to one embodiment of the present application, when the current value of the stepping motor assembly is greater than a preset critical current value, it is determined whether the stepping motor assembly is stalled.

[0025] According to another aspect of the present application, the present application further provides a door locking method of a cooking appliance, wherein the door locking method comprises the following steps:

[0026] (a) allowing the output shaft of a stepping motor assembly to rotate in one direction so that the stepping motor assembly drives a lock hook to swing relative to a lock body in one direction;

[0027] (b) confirming that the lock hook reaches a release target position when the stepping motor assembly is stalled;

[0028] (c) allowing the output shaft of the stepping motor assembly to rotate reversely so that the stepping motor assembly drives the lock hook to swing relative to the lock body in the opposite direction;

[0029] (d) calculating the number of pulses of the pulse voltage input to the stepping motor assembly; and

[0030] (e) comparing the input pulse number with a preset pulse number, and confirming that the lock hook reaches a locking target position when the stepping motor assembly is stalled if the input pulse number is consistent with the preset pulse number, and confirming that the lock hook reaches an abnormal target position when the stepping motor assembly is not stalled if the input pulse number is greater than the preset pulse number.

[0031] According to one embodiment of the present application, in the step (b) and the step (e), the back electromotive force value of the stepping motor assembly is obtained, and it is determined whether the back electromotive force value is 0 when the pulse voltage is 0, so as to determine whether the stepping motor assembly is stalled.

[0032] According to one embodiment of the present application, in the step (b) and the step (e), the current value of the stepping motor assembly is obtained, and it is determined whether the stepping motor assembly is stalled according to the current change value ΔI of adjacent time.

[0033] According to one embodiment of the present application, in the step (e), when the input pulse number is greater than the preset pulse number, the stepping motor assembly is stalled.

[0034] According to one embodiment of the present application, when the current value of the stepping motor assembly is greater than a preset critical current value, it is determined whether the stepping motor assembly is stalled.

[0035] According to another aspect of the present application, the present application further provides a door locking device, which comprises a stepping motor assembly and a lock body assembly, wherein the lock body assembly comprises:

[0036] a lock hook, wherein the lock hook has a connecting end and a hook-shaped locking end corresponding to the connecting end;

[0037] a lock body, wherein the lock body comprises a lock plate and a lock wall integrally extending upward from the lock plate, the lock plate has a first blocking protrusion, the lock wall has a lock hook passage, wherein the middle part of the lock hook is swingably arranged in the lock hook passage of the lock wall;

[0038] a sliding transmission element, wherein the sliding transmission element is slidably arranged in the lock plate, and one end of the sliding transmission element is rotatably mounted to the connecting end of the lock hook; and

[0039] a rotating transmission element, wherein the rotating transmission element has a swing arm on one side, one end of the rotating transmission element is rotatably mounted to the other end of the sliding transmission element, the other end is drivably mounted to the output shaft of the stepping motor assembly, the first blocking protrusion of the lock plate is located on one side of the rotating transmission element, wherein when the stepping motor assembly drives the rotating transmission element to rotate, the rotating transmission element drives the lock hook to swing relative to the lock body through the sliding transmission element, and the swing arm of the rotating transmission element can be blocked by the first blocking protrusion of the lock plate.

[0040] According to an embodiment of the present application, the lock plate has a second blocking protrusion located on the other side of the rotating transmission element, and the swing arm of the rotating transmission element can be blocked by the second blocking protrusion of the lock plate when the stepping motor assembly drives the rotating transmission element to rotate.

[0041] According to an embodiment of the present application, the first blocking protrusion is arranged on the upper side of the lock plate, and the rotating transmission element is suspended on the upper side of the lock plate by the stepping motor assembly.

[0042] According to an embodiment of the present application, the first blocking protrusion and the second blocking protrusion are arranged on the upper side of the lock plate, and the rotating transmission element is suspended on the upper side of the lock plate by the stepping motor assembly.

[0043] According to an embodiment of the present application, the lock body comprises at least one assembly arm integrally extending upward from the lock plate, and the stepping motor assembly is assembled in the assembly arm.

[0044] According to one embodiment of the present application, the lock plate has a guide slot, wherein the lock body assembly further comprises a guide element, the guide element is disposed on the sliding transmission element, and the guide element is slidably disposed in the guide slot of the lock plate.

[0045] According to one embodiment of the present application, at least one of the connecting end of the lock hook and one end of the sliding transmission element is rotatably mounted on the guide element.

[0046] According to another aspect of the present application, the present application further provides a cooking appliance, which comprises:

[0047] a cooking body, wherein the cooking body has a cooking space and a food passage communicating with the cooking space;

[0048] a door, wherein the door has a pivoting side, a locking side corresponding to the pivoting side, and a lock protrusion on the locking side, the pivoting side of the door is rotatably mounted on the cooking body, and the door can close the food passage of the cooking body; and

[0049] a door lock device, wherein the door lock device comprises a step motor assembly and a lock body assembly, wherein the lock body assembly comprises:

[0050] a lock hook, wherein the lock hook has a connecting end and a hook-shaped locking end corresponding to the connecting end;

[0051] a lock body, wherein the lock body comprises a lock plate and a lock wall integrally extending upward from the lock plate, the lock plate has a first blocking protrusion, the lock wall has a lock hook passage, wherein the middle part of the lock hook is swingably disposed in the lock hook passage of the lock wall;

[0052] a sliding transmission element, wherein the sliding transmission element is slidably disposed in the lock plate, and one end of the sliding transmission element is rotatably mounted on the connecting end of the lock hook; and

[0053] a rotating transmission element, wherein the rotating transmission element has a swing arm on one side thereof, one end of the rotating transmission element is rotatably mounted to the other end of the sliding transmission element, the other end of the rotating transmission element is drivably mounted to the output shaft of the stepping motor assembly, the first blocking protrusion of the lock plate is located on one side of the rotating transmission element, wherein when the stepping motor assembly drives the rotating transmission element to rotate, the rotating transmission element drives the lock hook to swing relative to the lock body through the sliding transmission element, and the swing arm of the rotating transmission element can be blocked by the first blocking protrusion of the lock plate, wherein the lock hook can release or hook the lock protrusion of the door.

[0054] According to another aspect of the present application, the present application further provides a door lock device, which comprises a stepping motor assembly and a lock body assembly, wherein the lock body assembly comprises:

[0055] a lock hook, wherein the lock hook has a connecting end and a hook-shaped locking end corresponding to the connecting end;

[0056] a lock body, wherein the lock body comprises a lock plate and a lock wall integrally extending upward from the lock plate, the lock plate has an arc-shaped slot, and the lock wall has a lock hook passage, wherein the middle part of the lock hook is swingably arranged in the lock hook passage of the lock wall;

[0057] a sliding transmission element, wherein the sliding transmission element is slidably arranged on the lock plate, and one end of the sliding transmission element is rotatably mounted to the connecting end of the lock hook; and

[0058] a rotating transmission element, wherein the rotating transmission element has a swing arm on one side thereof, one end of the rotating transmission element is rotatably mounted to the other end of the sliding transmission element, the other end of the rotating transmission element is drivably mounted to the output shaft of the stepping motor assembly, the first blocking protrusion of the lock plate is located on one side of the rotating transmission element, wherein when the stepping motor assembly drives the rotating transmission element to rotate, the rotating transmission element drives the lock hook to swing relative to the lock body through the sliding transmission element, and the swing arm of the rotating transmission element can be blocked by the first blocking protrusion of the lock plate, wherein the lock hook can release or hook the lock protrusion of the door.

[0059] According to one embodiment of the present application, the rotating transmission element is suspended above the lock plate by the driving motor assembly.

[0060] According to one embodiment of the present application, the lock body comprises at least one assembly arm integrally extending upward from the lock plate, and the stepping motor assembly is assembled on the assembly arm.

[0061] According to one embodiment of the present application, the lock plate has a guide slot, wherein the lock body assembly further comprises a guide element, the guide element is arranged on the sliding transmission element, and the guide element is slidably arranged in the guide slot of the lock plate.

[0062] According to one embodiment of the present application, at least one of the connecting end of the lock hook and one end of the sliding transmission element is rotatably mounted on the guide element.

[0063] According to another aspect of the present application, the present application further provides a cooking appliance, which comprises:

[0064] a cooking body, wherein the cooking body has a cooking space and a food passage communicating with the cooking space;

[0065] a door, wherein the door has a pivoting side, a locking side corresponding to the pivoting side, and a lock protrusion on the locking side, the pivoting side of the door is rotatably mounted on the cooking body, and the door can close the food passage of the cooking body; and

[0066] a door lock device, wherein the door lock device comprises a step motor assembly and a lock body assembly, wherein the lock body assembly comprises:

[0067] a lock hook, wherein the lock hook has a connecting end and a hook-shaped locking end corresponding to the connecting end;

[0068] a lock body, wherein the lock body comprises a lock plate and a lock wall integrally extending upward from the lock plate, the lock plate has an arc-shaped slot, the lock wall has a lock hook passage, wherein the middle part of the lock hook is swingably arranged in the lock hook passage of the lock wall; a sliding transmission element, wherein the sliding transmission element is slidably arranged in the lock plate, and one end of the sliding transmission element is rotatably mounted on the connecting end of the lock hook; and

[0069] a rotating transmission element, wherein the bottom side of the rotating transmission element has a limiting protrusion, one position of the rotating transmission element is rotatably mounted on the other end of the sliding transmission element, and the other position is drivingly mounted on the output shaft of the step motor assembly, the limiting protrusion of the rotating transmission element is slidably arranged in the arc-shaped slot of the lock plate, wherein

[0070] When the step motor assembly drives the rotating transmission element to rotate, the rotating transmission element drives the lock hook to swing relative to the lock body through the sliding transmission element, and the limiting protrusion of the rotating transmission element can be blocked by the inner wall of the lock plate for forming the limiting slot, wherein the lock hook can release or hook the lock protrusion of the door. BRIEF DESCRIPTION OF DRAWINGS

[0071] Figure 1 is a perspective view of a prior art door lock.

[0072] Figure 2 is a perspective view of a cooking appliance in a state according to a preferred embodiment of the present application.

[0073] Figure 3 is a perspective view of the cooking appliance in another state according to the preferred embodiment of the present application.

[0074] Figure 4 is a sectional view of a perspective view according to the preferred embodiment of the present application.

[0075] Figure 5 is Figure 4 is a partial enlarged view of

[0076] Figure 6 is a perspective view of another perspective view according to the preferred embodiment of the present application.

[0077] Figure 7 is a partial enlarged view of Figure 6

[0078] Figure 8 is a perspective view of a door lock device of the cooking appliance according to the preferred embodiment of the present application.

[0079] Figure 9 is a perspective view of another perspective view of the door lock device of the cooking appliance according to the preferred embodiment of the present application.

[0080] Figure 10 is an exploded view of a perspective view of the door lock device of the cooking appliance according to the preferred embodiment of the present application.

[0081] Figure 11 is an exploded view of another perspective view of the door lock device of the cooking appliance according to the preferred embodiment of the present application.

[0082] Figure 12 ​is a perspective view of a partial structure of the door lock device of the cooking appliance according to the above preferred embodiment of the present application.

[0083] Figure 13 is a perspective view of another view of the above partial structure of the door lock device of the cooking appliance according to the above preferred embodiment of the present application.

[0084] Figure 14 is an exploded view of a partial structure of the door lock device of the cooking appliance according to the above preferred embodiment of the present application.

[0085] Figure 15 is an exploded view of another view of the above partial structure of the door lock device of the cooking appliance according to the above preferred embodiment of the present application.

[0086] Figure 16 and Figure 17 respectively show the state of the door lock device of the cooking appliance according to the above preferred embodiment of the present application when a lock hook reaches a release target position.

[0087] Figure 18 and Figure 19 respectively show the state of the door lock device of the cooking appliance according to the above preferred embodiment of the present application when the lock hook reaches a lock target position.

[0088] Figure 20 and Figure 21 respectively show the state of the door lock device of the cooking appliance according to the above preferred embodiment of the present application when the lock hook reaches an abnormal target position.

[0089] Figure 22 is an exploded view of another door lock device of the cooking appliance according to the above preferred embodiment of the present application.

[0090] Figure 23 is an exploded view of another view of the door lock device of the cooking appliance according to the above preferred embodiment of the present application.

[0091] Figure 24 and Figure 25 respectively show the state of the door lock device of the cooking appliance according to the above preferred embodiment of the present application when a lock hook reaches a release target position.

[0092] Figure 26 and Figure 27 respectively show the state of the door lock device of the cooking appliance according to the above preferred embodiment of the present application when the lock hook reaches a lock target position. DETAILED DESCRIPTION

[0093] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The application is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising" or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms "mounted," "connected," "supported," and "coupled" and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings.

[0094] Also, in the disclosure of the application, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms cannot be understood as limiting the application. In the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as limiting the number.

[0095] Attached Figures 2 to 7A cooking appliance according to a preferred embodiment of the present application is shown, wherein the cooking appliance comprises a door locking device 100, a cooking body 200, and a door 300, wherein the cooking body 200 has a cooking space 201 and a food material passage 202 communicating with the cooking space 201, wherein the door 300 has a pivoting side 301, a locking side 302 corresponding to the pivoting side 301, and a locking protrusion 303 located at the locking side 302, the pivoting side 301 of the door 300 is rotatably installed on the cooking body 200, and the door 300 can close the food material passage 202 of the cooking body 200, wherein the door locking device 100 is arranged on the cooking body 200, and the door locking device 100 is configured to hook or release the locking protrusion 303 of the door 300. When the door locking device 100 hooks the locking protrusion 303 of the door 300, the cooking appliance prevents the user from opening the door 300, and accordingly, when the door locking device 100 releases the locking protrusion 303 of the door 300, the cooking appliance allows the user to open the door 300. Optionally, in other examples of the cooking appliance of the present application, the door locking device 100 can be arranged on the door 300, and accordingly, the locking protrusion 303 is arranged on the cooking body 200.

[0096] It can be understood that the accompanying drawings Figure 2 and Figure 3 When the door 300 of the cooking appliance is opened, the food material passage 202 of the cooking body 200 is exposed, at which time food materials can be put into the cooking space 201 of the cooking body 200 through the food material passage 202 of the cooking body 200, or food materials can be taken out of the cooking space 201 of the cooking body 200 through the food material passage 202 of the cooking body 200. Accordingly, when the door 300 of the cooking appliance is closed, the food material passage 202 of the cooking body 200 is closed, at which time food materials are not allowed to be put into the cooking space 201 of the cooking body 200 through the food material passage 202 of the cooking body 200, or food materials are not allowed to be taken out of the cooking space 201 of the cooking body 200 through the food material passage 202 of the cooking body 200. When the door locking device 100 hooks the locking protrusion 303 of the door 300, the door 300 is in a position to close the food material passage 202 of the cooking body 200, and the door locking device 100 prevents the door 300 from being opened by the user.

[0097] It is worth mentioning that the specific type of the cooking appliance is not limited in the present application, for example, the cooking appliance can be an oven.

[0098] Now turning to the drawings Figures 8 to 21 which shows one embodiment of the door lock device 100, wherein the door lock device 100 comprises a step motor assembly 10 and a lock body assembly 20.

[0099] The step motor assembly 10 has an output shaft 11, when a pulse voltage is input to the step motor assembly 10, the step motor assembly 10 outputs power in the form of rotation of the output shaft 11, wherein, unlike the prior art door lock which uses a synchronous motor as a power source, the step motor assembly 10 of the door lock device 100 of the present application can be input with low-voltage direct current, which makes the door lock device 100 of the present application not have the problem of safety hazard to users caused by electric leakage. It can be understood that the input mode of the pulse voltage determines the rotation direction of the output shaft 11 of the step motor assembly 10, for example, the output shaft 11 of the step motor assembly 10 can rotate clockwise or counterclockwise.

[0100] In some embodiments of the present application, the step motor assembly 10 is implemented as a step motor, and the rotor of the step motor is the output shaft 11 of the step motor assembly 10. It can be understood that the step motor is a motor that rotates the rotor by pulse voltage driving, and the rotor of the step motor can rotate a certain angle every time a pulse voltage is input to the coil of the step motor, for example, the step angle of the step motor can be 15°, so that the rotor of the step motor rotates 15° every time a pulse voltage is input to the coil of the step motor, i.e. the output shaft 11 of the step motor assembly 10 rotates 15°. Therefore, in the door lock device 100 of the present application, the rotation angle of the output shaft 11 can be controlled by controlling the number of pulses of the pulse voltage input to the step motor assembly 10.

[0101] In some embodiments of the present application, the step motor assembly 10 is implemented as a combination of a step motor and a gear box, the output shaft 11 of the step motor assembly 10 is formed by the gear box, wherein the rotation angle of the output shaft 11 of the step motor assembly 10 per input of a pulse voltage to the coil of the step motor is related to the step angle of the step motor and the gear ratio of the gear box, for example, the step angle of the step motor is 15°, the gear ratio of the gear box is 150, then the output shaft 11 of the step motor assembly 10 rotates 0.1° per input of a pulse voltage to the coil of the step motor, that is, if the output shaft 11 of the step motor assembly 10 needs to rotate 360°, 3600 pulse voltages need to be provided to the coil of the step motor. Therefore, in the door lock device 100 of the present application, the rotation angle of the output shaft 11 can be controlled by controlling the number of pulses of the pulse voltage input to the step motor assembly 10.

[0102] It is worth mentioning that the position of the output shaft 11 of the step motor assembly 10 is not limited in the door lock device 100 of the present application, for example, in some embodiments of the present application, the output shaft 11 of the step motor assembly 10 is located on the central axis of the step motor assembly 100, in some other embodiments of the present application, the output shaft 11 of the step motor assembly 10 deviates from the central axis of the step motor assembly 100, that is, the step motor assembly 100 has an eccentric output shaft 11.

[0103] Continuing to refer to the drawings Figures 8 to 21, the lock body assembly 20 comprises a lock hook 21, a lock body 22, a sliding transmission element 23 and a rotating transmission element 24, wherein the lock hook 21 has a connecting end 211 and a hook-shaped locking end 212 corresponding to the connecting end 211, the lock body 22 comprises a lock plate 221 and a lock wall 222 integrally extending upward from the lock plate 221, the lock wall 222 has a lock hook passage 2221, the middle part of the lock hook 21 is swingably arranged in the lock hook passage 2221 of the lock wall 222, the sliding transmission element 23 is slidably arranged in the lock plate 221, one end of the sliding transmission element 23 is rotatably mounted on the connecting end 211 of the lock hook 21, the other end of the sliding transmission element 23 is rotatably mounted on a position of the rotating transmission element 24, and the position of the rotating transmission element 24 is drivably mounted on the output shaft 11 of the stepping motor assembly 10. When the stepping motor assembly 10 is input with pulse voltage to output power in the form of rotation of the output shaft 11, the stepping motor assembly 10 drives the rotating transmission element 24 to rotate, the rotating transmission element 24 pulls or pushes the sliding transmission element 23 to produce displacement relative to the lock plate 221 when rotating, and the locking end 212 of the lock hook 21 produces swing relative to the lock body 22 with the assistance of the lock wall 222 to release or hook the lock protrusion 303 of the door 300.

[0104] One side of the rotating transmission element 24 has a swing arm 241, the lock plate 221 of the lock body 22 has a first blocking protrusion 2211 located on one side of the rotating transmission element 24, wherein when the stepping motor assembly 10 drives the lock hook 21 to produce upward swing relative to the lock body 22 through the rotating transmission element 24 and the sliding transmission element 23, referring to the attached Figure 16 and Figure 17 The first blocking protrusion 2211 of the lock plate 221 can block the swing arm 241 of the rotating transmission element 24 to make the stepping motor assembly 10 locked, and the position of the lock hook 21 at this time is defined as a release target position, when the lock hook 21 is in the release target position, the lock hook 21 releases the lock protrusion 303 of the door 300 to allow the door 300 to be opened, wherein when the stepping motor assembly 10 drives the lock hook 21 to produce downward swing relative to the lock body 22 through the rotating transmission element 24 and the sliding transmission element 23, referring to the attached Figure 18 and Figure 19, the lock protrusion 303 of the door 300 can block the locking end 212 of the lock hook 21, so that the stepper motor assembly 10 is locked, and the position of the lock hook 21 at this time is defined as a locking target position, and when the lock hook 21 is at the locking target position, the lock hook 21 hooks the lock protrusion 303 of the door 300 to prevent the door 300 from being opened.

[0105] It can be understood that when the stepper motor assembly 10 is locked, the current change value ΔI of the stepper motor assembly 10 adjacent in time increases sharply, and therefore, in the process that the stepper motor assembly 10 drives the lock hook 21 to swing relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, the lock hook 21 can be determined to swing to a target position by detecting the current value of the stepper motor assembly 10 in real time and judging whether the current change value ΔI adjacent in time increases sharply. In this way, the door lock device 100 of the present application does not need to be configured with a micro switch, thereby facilitating the simplification of the structure of the door lock device 100 and the reduction of the cost of the door lock device 100, and improving the reliability of the door lock device 100. Preferably, when the current value of the stepper motor assembly 10 is greater than a preset critical current value, it is judged whether the stepper motor assembly 10 is locked, and in this way, the accurate judgment of the safe running state of the stepper motor assembly 10 can be ensured.

[0106] It is worth mentioning that before the stepper motor assembly 10 is locked, the current I in the coil of the stepper motor assembly 10 is stable and the value is in a light load state (the current value I is small), so the current change value ΔI in the time Δt is approximately 0, that is, the current values corresponding to two small change time points are very close. When the stepper motor assembly 10 is locked, the current I in the coil of the stepper motor assembly 10 suddenly and rapidly increases, so that the current change value ΔI increases sharply, and therefore, whether the lock hook 21 swings to the target position can be determined by judging whether the current change value ΔI adjacent in time increases sharply.

[0107] It is also worth mentioning that the target position can be the release target position or the locking target position, and in the door lock device 100 of the present application, when the stepper motor assembly 10 is locked, whether the lock hook 21 is at the release target position or at the locking target position can be determined according to the input mode of the pulse voltage of the stepper motor assembly 10. Specifically, when the stepper motor assembly 10 drives the lock hook 21 to swing upward relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, referring to FIG. 2, the lock hook 21 is at the release target position, and when the stepper motor assembly 10 drives the lock hook 21 to swing downward relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, referring to FIG. 3, the lock hook 21 is at the locking target position. Figure 16 and Figure 17If the stepper motor assembly 10 is blocked from rotating due to the first blocking protrusion 2211 of the lock plate 221 blocking the swing arm 241 of the rotating transmission element 24, it is confirmed that the lock hook 21 is at the release target position, at which time the lock hook 21 releases the lock protrusion 303 of the door 300 to allow the door 300 to be opened. Accordingly, when the stepper motor assembly 10 drives the lock hook 21 to swing downward relative to the lock body 22 through the rotating transmission element 24 and the sliding transmission element 23, it is confirmed that the lock hook 21 is at the release target position, at which time the lock hook 21 releases the lock protrusion 303 of the door 300 to allow the door 300 to be opened, with reference to FIG. 6. Figure 18 And Figure 19 If the stepper motor assembly 10 is blocked from rotating due to the lock protrusion 303 of the door 300 blocking the locking end 212 of the lock hook 21, it is confirmed that the lock hook 21 is at the locking target position, at which time the lock hook 21 hooks the lock protrusion 303 of the door 300 to prevent the door 300 from being opened.

[0108] Specifically, with reference to FIG. 6, Figures 16 to 19 When the output shaft 11 of the stepper motor assembly 10 rotates counterclockwise, the stepper motor assembly 10 drives the lock hook 21 to swing upward relative to the lock body 22 through the rotating transmission element 24 and the sliding transmission element 23, at which time if the stepper motor assembly 10 is blocked from rotating, it is confirmed that the lock hook 21 reaches the release target position. When the output shaft 11 of the stepper motor assembly 10 rotates counterclockwise, the stepper motor assembly 10 drives the lock hook 21 to swing downward relative to the lock body 22 through the rotating transmission element 24 and the sliding transmission element 23, at which time if the stepper motor assembly 10 is blocked from rotating, it is confirmed that the lock hook 21 reaches the locking target position.

[0109] In addition, in the process that the step motor assembly 10 drives the lock hook 21 to swing relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, the step motor assembly 10 is real-time detected to determine whether the back electromotive force value is 0 when the pulse voltage is 0, so as to confirm whether the lock hook 21 swings to the target position. In this way, the door lock device 100 does not need to be configured with a micro switch, thereby facilitating the simplification of the structure of the door lock device 100 and the reduction of the cost of the door lock device 100, and improving the reliability of the door lock device 100. Specifically, in the door lock device 100, when the step motor assembly 10 is blocked, the input mode of the pulse voltage of the step motor assembly 10 can be used to confirm whether the lock hook 21 is at the release target position or at the locking target position. Specifically, when the step motor assembly 10 drives the lock hook 21 to swing upward relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, referring to FIG. 2, if the step motor assembly 10 is blocked due to the first blocking protrusion 2211 of the lock plate 221 blocking the swing arm 241 of the rotation transmission element 24, it is confirmed that the lock hook 21 is at the release target position, at which the lock hook 21 releases the lock protrusion 303 of the door 300 to allow the door 300 to be opened. Correspondingly, when the step motor assembly 10 drives the lock hook 21 to swing downward relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, referring to FIG. 3, if the step motor assembly 10 is blocked due to the lock protrusion 303 of the door 300 blocking the locking end 212 of the lock hook 21, it is confirmed that the lock hook 21 is at the locking target position, at which the lock hook 21 hooks the lock protrusion 303 of the door 300 to prevent the door 300 from being opened. Figure 16 and Figure 17 If the step motor assembly 10 is blocked due to the first blocking protrusion 2211 of the lock plate 221 blocking the swing arm 241 of the rotation transmission element 24, it is confirmed that the lock hook 21 is at the release target position, at which the lock hook 21 releases the lock protrusion 303 of the door 300 to allow the door 300 to be opened. Correspondingly, when the step motor assembly 10 drives the lock hook 21 to swing downward relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, referring to FIG. 3, if the step motor assembly 10 is blocked due to the lock protrusion 303 of the door 300 blocking the locking end 212 of the lock hook 21, it is confirmed that the lock hook 21 is at the locking target position, at which the lock hook 21 hooks the lock protrusion 303 of the door 300 to prevent the door 300 from being opened. Figure 18 and Figure 19 If the step motor assembly 10 is blocked due to the first blocking protrusion 2211 of the lock plate 221 blocking the swing arm 241 of the rotation transmission element 24, it is confirmed that the lock hook 21 is at the release target position, at which the lock hook 21 releases the lock protrusion 303 of the door 300 to allow the door 300 to be opened. Correspondingly, when the step motor assembly 10 drives the lock hook 21 to swing downward relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, referring to FIG. 3, if the step motor assembly 10 is blocked due to the lock protrusion 303 of the door 300 blocking the locking end 212 of the lock hook 21, it is confirmed that the lock hook 21 is at the locking target position, at which the lock hook 21 hooks the lock protrusion 303 of the door 300 to prevent the door 300 from being opened.

[0110] It is worth mentioning that the manner in which the sliding transmission element 23 is rotatably mounted to the rotation transmission element 24 is not limited in the door lock device 100. For example, the lock body assembly 20 includes a mounting shaft 25, and at least one of the sliding transmission element 23 and the rotation transmission element 24 is rotatably mounted to the mounting shaft 25, so that the sliding transmission element 23 is rotatably mounted to the rotation transmission element 24.

[0111] It is also worth mentioning that the manner in which the rotary transmission element 24 is drivably mounted to the output shaft 11 of the stepper motor assembly 10 is not limited in the door lock device 100 of the present invention. For example, the rotary transmission element 24 has a non-circular insertion hole 240, the shape and size of the output shaft 11 of the stepper motor assembly 10 matching the size and shape of the insertion hole 240 of the rotary transmission element 24, wherein the end of the output shaft 11 of the stepper motor assembly 10 is inserted into the insertion hole 240 of the rotary transmission element 24, so that the rotary transmission element 24 is drivably mounted to the output shaft 11 of the stepper motor assembly 10.

[0112] Continue to refer to the appendix Figure 14 and Figure 15 The lock body assembly 20 further includes a guide element 26, which is disposed on the sliding transmission element 23. The lock plate 221 has a guide groove 2212, and the guide element 26 is slidably disposed in the guide groove 2212 of the lock plate 221. When the stepper motor assembly 10 drives the rotary transmission element 24 to rotate, the guide element 26 and the lock plate 221 cooperate to cause the sliding transmission element 23 to slide relative to the lock plate 221. In other words, the guide element 26 and the lock plate 221 cooperate to convert the rotation of the rotary transmission element 24 into the sliding of the sliding transmission element 23. Optionally, in other examples of the door lock device 100 of the present invention, the guide element 26 may be disposed on the lock plate 221, and the guide groove 2212 may be disposed on the sliding transmission element 23, such that the guide element 26 and the lock plate 221 cooperate to convert the rotation of the rotary transmission element 24 into the sliding of the sliding transmission element 23.

[0113] It is worth mentioning that the specific manner in which the guide element 26 is disposed on the sliding transmission element 23 is not limited in the door lock device 100 of the present invention. For example, in the appendix Figures 8 to 21 In this specific example of the door lock device 100 of the present invention shown, the connecting end 211 of the lock hook 21 and one end of the sliding transmission element 23 are both mounted on the guide element 26 to set the guide element 26 on the sliding transmission element 23, and at least one of the connecting end 211 of the lock hook 21 and the end of the sliding transmission element 23 is rotatably mounted on the guide element 26, so that when the sliding transmission element 23 is driven by the rotational transmission element 24 to produce sliding relative to the lock plate 221, the locking end 212 of the lock hook 21 produces swinging relative to the lock body 22.

[0114] Continuing to refer to the drawings Figures 8 to 21 The locking hook 21 has a first guide slope 213 and a second guide slope 214 corresponding to the first guide slope 213, the extension direction of the first guide slope 213 of the locking hook 21 and the sliding direction of the sliding transmission element 23 have an obtuse angle included angle, the extension direction of the second guide slope 214 of the locking hook 21 and the sliding direction of the sliding transmission element 23 have an acute angle included angle, wherein the lock wall 222 has a first abutting side 2222 and a second abutting side 2223, the first abutting side 2222 and the second abutting side 2223 are a pair of opposite sides of the lock wall 222 for defining the locking hook passage 2221, wherein the first guide slope 213 of the locking hook 21 can abut against the first abutting side 2222 of the lock wall 222, and the second guide slope 214 of the locking hook 21 can abut against the second abutting side 2223 of the lock wall 222.

[0115] When the stepping motor assembly 10 is input with pulse voltage to output power in a clockwise rotation manner of the output shaft 11, the stepping motor assembly 10 drives the rotation transmission element 24 to rotate around the output shaft 11, the rotation transmission element 24 pulls the sliding transmission element 23 inward to make the sliding transmission element 23 slide relative to the lock plate 221 of the lock body 22, at this time, the sliding transmission element 23 pulls the connecting end 211 of the locking hook 21 inward, because the first guide slope 213 of the locking hook 21 abuts against the first abutting side 2222 of the lock wall 222, the locking end 212 of the locking hook 21 swings relative to the lock wall 222 of the lock body 22 to make the locking hook 21 reach the locking target position so that the locking end 212 of the locking hook 21 can hook the lock protrusion 303 of the door 300.

[0116] Correspondingly, when the stepping motor assembly 10 is input with pulse voltage to output power in a counterclockwise rotation manner of the output shaft 11, the stepping motor assembly 10 drives the rotation transmission element 24 to rotate around the output shaft 11, the rotation transmission element 24 pushes the sliding transmission element 23 inward and outward to make the sliding transmission element 23 slide relative to the lock plate 221 of the lock body 22, at this time, the sliding transmission element 23 pushes the connecting end 211 of the locking hook 21 outward, because the second guide slope 214 of the locking hook 21 abuts against the second abutting side 2223 of the lock wall 222, the locking end 212 of the locking hook 21 can swing relative to the lock wall 222 of the lock body 22 to make the locking hook 21 reach the release target position so that the locking end 212 of the locking hook 21 can release the lock protrusion 303 of the door 300.

[0117] Furthermore, the lock plate 221 of the lock body 22 has a second blocking protrusion 2213. The first blocking protrusion 2211 and the second blocking protrusion 2213 are respectively located on opposite sides of the rotary transmission element 24. When the stepper motor assembly 10 outputs power by rotating counterclockwise on the output shaft 11 due to the input pulse voltage, the swing arm 241 of the rotary transmission element 24 can be blocked by the first blocking protrusion 2211 of the lock plate 221, thereby causing the stepper motor assembly 10 to stall. When the locking hook 21 reaches the release target position, correspondingly, when the stepper motor assembly 10 outputs power by rotating the output shaft 11 clockwise due to the input pulse voltage, if the locking end 212 of the locking hook 21 does not hook the locking protrusion 303 of the door 300, then the swing arm 241 of the rotation transmission element 24 can be blocked by the second blocking protrusion 2213 of the lock plate 21, so that the stepper motor assembly 10 is stalled. At this time, the locking hook 21 reaches an abnormal target position. (Refer to the attached diagram.) Figure 20 and Figure 21 It is understandable that when the locking hook 21 is confirmed to have reached the abnormal target position, the door lock device 100 has not locked the door 300 onto the cooking body 200. If the cooking appliance is started at this time, it will pose a significant safety hazard to the user. In this case, the cooking appliance can remind the user to check whether the door 300 of the cooking appliance is closed properly.

[0118] In other words, refer to the appendix Figure 16 and Figure 17 When the stepper motor assembly 10 drives the locking hook 21 to swing upward relative to the lock body 22 via the rotational transmission element 24 and the sliding transmission element 23, the first blocking protrusion 2211 of the lock plate 221 can block the swing arm 241 of the rotational transmission element 24, thereby causing the stepper motor assembly 10 to stall. At this time, the locking hook 21 reaches the release target position. (See attached diagram) Figure 18 and Figure 19 When the stepper motor assembly 10 drives the locking hook 21 to swing downward relative to the lock body 22 via the rotational transmission element 24 and the sliding transmission element 23, the locking end 212 of the locking hook 21 can hook the locking protrusion 303 of the door 300, causing the stepper motor assembly 10 to stall. At this time, the locking hook 21 reaches the locking target position. (See attached diagram) Figure 20 and Figure 21When the step motor assembly 10 drives the lock hook 21 to swing downward relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, if the door 300 is not closed to the position, the second blocking protrusion 2213 of the lock plate 221 can block the swing arm 241 of the rotation transmission element 24, so that the step motor assembly 10 is blocked, and at this time, the lock hook 21 reaches the abnormal target position.

[0119] When the step motor assembly 10 is input with pulse voltage and outputs power in the manner that the output shaft 11 rotates clockwise, in order to confirm whether the target position reached by the lock hook 21 is the locking target position or the abnormal target position, when the step motor assembly 10 is blocked, the number of pulses input and the preset number of pulses are compared, if the number of pulses input and the preset number of pulses are consistent, it is confirmed that the lock hook 21 reaches the locking target position, and if the number of pulses input is greater than the preset number of pulses, it is confirmed that the lock hook 21 reaches the abnormal target position.

[0120] For example, in one specific example of the cooking utensil of the present application, if the lock hook 21 swings from the release target position to the locking target position, it requires that the output shaft 11 of the step motor assembly 10 rotates 180°, so that the step motor assembly 10 needs to be provided with pulse voltage of 1800 pulse numbers, that is, the preset number of pulses is 1800. When the step motor assembly 10 is input with pulse voltage and outputs power in the manner that the output shaft 11 rotates clockwise, the number of pulses of the pulse voltage input into the step motor assembly 10 can be calculated, if the step motor assembly 10 is blocked when the number of pulses of the pulse voltage input is about 1800 (for example, 1800±5), the number of pulses input and the preset number of pulses are consistent, at this time, it is confirmed that the lock hook 21 reaches the locking target position, and if the step motor assembly 10 is blocked when the number of pulses of the pulse voltage input is about 2000, the number of pulses input is greater than the preset number of pulses, at this time, it is confirmed that the lock hook 21 reaches the abnormal target position.

[0121] Preferably, the first blocking protrusion 2211 and the second blocking protrusion 2213 of the lock plate 221 of the lock body 22 are both located on the upper side of the lock plate 221, and the rotation transmission element 24 is suspended on the upper side of the lock plate 21 by the step motor assembly 10. In this way, the overall structure of the door lock device 100 can be more compact, so that the door lock device 100 has a smaller volume, thereby making the door lock device 100 particularly suitable for the cooking utensil.

[0122] Preferably, reference is made to the accompanying drawings Figures 8 to 21The lock body 22 further comprises at least one assembly arm 223 extending upward from the lock plate 221, the stepping motor assembly 10 is assembled to the assembly arm 223 of the lock body 22, so that the stepping motor assembly 10 and the lock body assembly 20 are assembled as a whole. More preferably, the number of the assembly arms 223 of the lock body 22 is two, so that the stepping motor assembly 10 can be stably assembled to the lock body 22, thereby improving the reliability of the door lock device 100.

[0123] In the following, the door lock device 100 of the present application will be described in detail with reference to the accompanying drawings. Figures 8 to 21 In this specific example of the door lock device 100 of the present application, the lock body 22 is a sheet metal part, which is punched and / or bent along different positions to form the lock plate 221, the lock wall 222 and the assembly arm 223, and the lock plate 221 forms the first blocking protrusion 2211, the second blocking protrusion 2213 and the guide groove 2212.

[0124] With reference to the accompanying drawings, the operation of the door lock device 100 of the present application will be described in detail. Figures 16 to 21 After the door 300 is turned to the position of closing the food material passage 202 of the cooking body 200, firstly, pulse voltage is input to the stepping motor assembly 10 to make the stepping motor assembly 10 output power in the counterclockwise rotation of the output shaft 11, and the stepping motor assembly 10 drives the lock hook 21 to swing upward to the release target position through the rotation transmission element 24 and the sliding transmission element 23, secondly, pulse voltage is input to the stepping motor assembly 10 to make the stepping motor assembly 10 output power in the clockwise rotation of the output shaft 11, and the stepping motor assembly 10 drives the lock hook 21 to swing downward, and in this process, the number of pulses of the pulse voltage input to the stepping motor assembly 10 is calculated, thirdly, if the stepping motor assembly 10 is locked, the number of input pulses is compared with the preset number of pulses, if the number of input pulses is consistent with the preset number of pulses, it is determined that the lock hook 21 reaches the locking target position, i.e. the locking end 212 of the lock hook 21 hooks the lock protrusion 303 of the door 300, at this time the door 300 prevents the user from opening, if the number of input pulses is greater than the preset number of pulses, it is determined that the lock hook 21 reaches the abnormal target position, i.e. the locking end 212 of the lock hook 21 does not hook the lock protrusion 303 of the door 300, in order to avoid the safety hazard brought to the user by starting the cooking appliance, the cooking appliance can remind the user to check whether the door 300 of the cooking appliance is closed in place, which is crucial for the user to use the cooking appliance safely.

[0125] According to one aspect of the present application, the present application provides a method for locking a door of a cooking appliance, wherein the method comprises the steps of:

[0126] (a) allowing the output shaft 11 of the stepping motor assembly 10 to rotate in one direction so that the stepping motor assembly 10 drives the lock hook 21 to swing in one direction relative to the lock body 22;

[0127] (b) confirming that the lock hook 21 reaches the release target position when the stepping motor assembly 10 is locked;

[0128] (c) allowing the output shaft 11 of the stepping motor assembly 10 to rotate in the opposite direction so that the stepping motor assembly 10 drives the lock hook 21 to swing in the opposite direction relative to the lock body 22;

[0129] (d) counting the number of pulses of the pulse voltage input to the stepping motor assembly 10; and

[0130] (e) comparing the input pulse number with the preset pulse number, and confirming that the lock hook 21 reaches the locking target position when the stepping motor assembly 10 is locked in the input pulse number is identical to the preset pulse number, and confirming that the lock hook 21 reaches the abnormal target position when the stepping motor assembly 10 is not locked in the input pulse number is greater than the preset pulse number.

[0131] Specifically, in one specific example of the present application, a pulse voltage is input to the stepping motor assembly 10 to allow the stepping motor assembly 10 to output power in a manner that the output shaft 11 rotates counterclockwise, and the stepping motor assembly 10 drives the lock hook 21 to swing upward to the release target position through the rotation transmission element 24 and the sliding transmission element 23, which is the reference position when the door lock device 100 is locked. A pulse voltage is input to the stepping motor assembly 10 to allow the stepping motor assembly 10 to output power in a manner that the output shaft 11 rotates clockwise, and the stepping motor assembly 10 drives the lock hook 21 to swing downward through the rotation transmission element 24 and the sliding transmission element 23, and the number of pulses of the pulse voltage input to the stepping motor assembly 10 can be calculated in this process. In the process in which the stepping motor assembly 10 drives the lock hook 21 to swing downward through the rotation transmission element 24 and the sliding transmission element 23, the locking method continuously compares the number of input pulses with the preset number of pulses, and if the stepping motor assembly 10 is locked when the number of input pulses and the preset number of pulses are consistent, the locking method confirms that the lock hook 21 reaches the locking target position, and if the stepping motor assembly 10 is not locked when the number of input pulses is greater than the preset number of pulses, the locking method confirms that the lock hook 21 reaches the abnormal target position.

[0132] According to one aspect of the present application, the present application provides a lock hook position detection method of the door lock device 100, wherein the lock hook position detection method comprises the following steps:

[0133] (I) inputting a pulse voltage to the stepping motor assembly 10 to allow the stepping motor assembly 10 to drive the lock hook 21 to swing relative to the lock body 22;

[0134] (II) obtaining the back electromotive force value of the stepping motor assembly 10;

[0135] (III) determining whether the back electromotive force value is 0 when the pulse voltage is 0 to determine whether the stepping motor assembly 10 is locked; and

[0136] (IV) confirming that the lock hook 21 reaches the target position when the stepping motor assembly 10 is locked.

[0137] According to one aspect of the present application, the present application provides a lock hook position detection method of the door lock device 100, wherein the lock hook position detection method comprises the following steps:

[0138] (A) inputting a pulse voltage to the stepping motor assembly 10 to allow the stepping motor assembly 10 to drive the lock hook 21 to swing relative to the lock body 22;

[0139] (B) obtaining the current value of the stepping motor assembly 10;

[0140] (C) judging whether the stepping motor assembly 10 is locked according to the current change value ΔI of adjacent time; and

[0141] (D) confirming that the lock hook reaches the target position when the stepping motor assembly 10 is locked.

[0142] The Figures 22 to 27 A variant of the door lock device 100 of the present application is shown in the accompanying Figures 8 to 21 The difference between the door lock device 100 shown in the accompanying Figures 22 to 27 In this specific example of the door lock device 100 shown in the accompanying Figure 24 and Figure 25 When the stepping motor assembly 10 drives the lock hook 21 to swing upward relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, the limiting protrusion 242 of the rotation transmission element 24 can be blocked by the inner wall of the lock plate 221 for forming the arc-shaped slot 2214, so that the stepping motor assembly 10 is locked, at this time the lock hook 21 reaches the release target position, refer to the accompanying Figure 26 and Figure 27 When the stepping motor assembly 10 drives the lock hook 21 to swing downward relative to the lock body 22 through the rotation transmission element 24 and the sliding transmission element 23, the locking end 212 of the lock hook 21 can hook the lock protrusion 303 of the door 300, so that the stepping motor assembly 10 is locked, at this time the lock hook 21 reaches the locking target position, in this process, if the door 300 is not closed in place, the inner wall of the lock plate 221 for forming the arc-shaped slot 2214 can block the limiting protrusion 242 of the rotation transmission element 24, so that the stepping motor assembly 10 is locked, at this time the lock hook 21 reaches the abnormal target position.

[0143] It can be seen that the purposes of the present application can be fully and effectively achieved. The embodiments for explaining the functional and structural principles of the present application have been fully described and illustrated, and the present application is not limited by changes based on the principles of these embodiments. Therefore, the present application includes all modifications within the scope and spirit of the appended claims.

Claims

1. A method of detecting a position of a lock hook of a door lock device, characterized by, The lock hook position detection method comprises the following steps: (I) inputting pulse voltage to a step motor assembly to allow the step motor assembly to drive a lock hook to swing relative to a lock body; (II) obtaining back electromotive force value of the step motor assembly; (III) judging whether the back electromotive force value is 0 when the pulse voltage is 0 to determine whether the step motor assembly is locked; and (IV) confirming that the lock hook reaches a target position when the step motor assembly is locked; wherein in the step (IV), according to input mode of pulse voltage of the step motor assembly, it is confirmed that the lock hook reaches a release target position, a lock target position or an abnormal target position; wherein when the step motor assembly drives the lock hook to swing from the release target position to the lock target position, the number of pulses input to the step motor assembly is calculated, and when the step motor assembly is locked, the number of input pulses is compared with preset pulse number, if the number of input pulses is consistent with the preset pulse number, it is confirmed that the lock hook reaches the lock target position, and if the number of input pulses is greater than the preset pulse number, it is confirmed that the lock hook reaches the abnormal target position.

2. The lock hook position detection method according to claim 1, wherein when current value of the step motor assembly is greater than preset critical current value, it is judged whether the step motor assembly is locked.

3. A method of detecting the position of a latch hook of a door lock device, characterized by, The lock hook position detection method comprises the following steps: (A) inputting pulse voltage to a step motor assembly to allow the step motor assembly to drive a lock hook to swing relative to a lock body; (B) obtaining current value of the step motor assembly; (C) judging whether the step motor assembly is locked according to current change value ΔI of adjacent time; and (D) confirming that the lock hook reaches a target position when the step motor assembly is locked; wherein in the step (D), according to input mode of pulse voltage of the step motor assembly, it is confirmed that the lock hook reaches a release target position, a lock target position or an abnormal target position; wherein when the step motor assembly drives the lock hook to swing from the release target position to the lock target position, the number of pulses input to the step motor assembly is calculated, and when the step motor assembly is locked, the number of input pulses is compared with preset pulse number, if the number of input pulses is consistent with the preset pulse number, it is confirmed that the lock hook reaches the lock target position, and if the number of input pulses is greater than the preset pulse number, it is confirmed that the lock hook reaches the abnormal target position.

4. The lock hook position detection method according to claim 3, wherein when current value of the step motor assembly is greater than preset critical current value, it is judged whether the step motor assembly is locked.

5. A method of locking a door of a cooking appliance, characterized in that, The lock door method comprises the following steps: (a) allowing output shaft of a step motor assembly to rotate in a direction to allow the step motor assembly to drive a lock hook to swing relative to a lock body in a direction; (b) confirming that the lock hook reaches a release target position when the step motor assembly is locked; (c) allowing the output shaft of the step motor assembly to rotate reversely, so that the step motor assembly drives the lock hook to swing relative to the lock body in the opposite direction; (d) counting the number of pulses of the pulse voltage input to the step motor assembly; and (e) comparing the input number of pulses with the preset number of pulses, and if the step motor assembly is stalled when the input number of pulses is consistent with the preset number of pulses, it is confirmed that the lock hook reaches a locking target position, and if the step motor assembly is not stalled when the input number of pulses is greater than the preset number of pulses, it is confirmed that the lock hook reaches an abnormal target position; wherein in the step (b) and the step (e), the back electromotive force value of the step motor assembly is obtained, and it is determined whether the back electromotive force value is 0 when the pulse voltage is 0, so as to determine whether the step motor assembly is stalled.

6. The method of claim 5, wherein in the step (e), the step motor assembly is stalled when the input number of pulses is greater than the preset number of pulses.

7. The method of claim 5, wherein whether the step motor assembly is stalled is determined when the current value of the step motor assembly is greater than a preset critical current value.

8. A method of locking a door of a cooking appliance, characterized in that, The method of locking a door comprises the following steps: (a) allowing the output shaft of a step motor assembly to rotate in a direction, so that the step motor assembly drives a lock hook to swing relative to a lock body in the direction; (b) confirming that the lock hook reaches a release target position when the step motor assembly is stalled; (c) allowing the output shaft of the step motor assembly to rotate reversely, so that the step motor assembly drives the lock hook to swing relative to the lock body in the opposite direction; (d) counting the number of pulses of the pulse voltage input to the step motor assembly; and (e) comparing the input number of pulses with the preset number of pulses, and if the step motor assembly is stalled when the input number of pulses is consistent with the preset number of pulses, it is confirmed that the lock hook reaches a locking target position, and if the step motor assembly is not stalled when the input number of pulses is greater than the preset number of pulses, it is confirmed that the lock hook reaches an abnormal target position; wherein in the step (b) and the step (e), the current value of the step motor assembly is obtained, and whether the step motor assembly is stalled is determined according to the current change value ΔI of adjacent time.

9. The method of claim 8, wherein in the step (e), the step motor assembly is stalled when the input number of pulses is greater than the preset number of pulses.

10. The method of claim 8, wherein whether the step motor assembly is stalled is determined when the current value of the step motor assembly is greater than a preset critical current value.

11. A door locking device characterized by The method comprises a step motor assembly and a lock body assembly, wherein the lock body assembly comprises: a lock hook, wherein the lock hook has a connecting end and a hook-shaped locking end corresponding to the connecting end; a lock body, wherein the lock body comprises a lock plate and a lock wall integrally extending upward from the lock plate, the lock plate has a first blocking protrusion, a second blocking protrusion and a guide slot, the lock wall has a lock hook passage, wherein the middle part of the lock hook is swingably arranged in the lock hook passage of the lock wall; a sliding transmission element, wherein the sliding transmission element is slidably arranged in the lock plate, and one end of the sliding transmission element is rotatably mounted to the connecting end of the lock hook; and a guide element, wherein the guide element is arranged in the sliding transmission element, and the guide element is slidably arranged in the guide slot of the lock plate; a rotating transmission element, wherein the rotating transmission element has a swing arm on one side, one end of the rotating transmission element is rotatably mounted to the other end of the sliding transmission element, and the other end is drivably mounted to the output shaft of the stepping motor assembly, the first blocking protrusion of the lock plate is located on one side of the rotating transmission element, and the second blocking protrusion of the lock plate is located on the other side of the rotating transmission element, wherein when the stepping motor assembly drives the rotating transmission element to rotate, the rotating transmission element drives the lock hook to swing relative to the lock body through the sliding transmission element, and the swing arm of the rotating transmission element can be blocked by the first blocking protrusion or the second blocking protrusion of the lock plate; wherein the lock body assembly comprises a mounting shaft, and at least one of the sliding transmission element and the rotating transmission element is rotatably mounted to the mounting shaft, so that the sliding transmission element is rotatably mounted to the rotating transmission element.

12. The door lock device according to claim 11, wherein the rotating transmission element has a non-circular insertion hole, the output shaft of the stepping motor assembly matches the shape and size of the insertion hole of the rotating transmission element in shape and size, and the end of the output shaft of the stepping motor assembly is inserted into the insertion hole of the rotating transmission element, so that the rotating transmission element is drivably mounted to the output shaft of the stepping motor assembly.

13. The door lock device according to claim 11, wherein the first blocking protrusion and the second blocking protrusion are arranged on the upper side of the lock plate, and the rotating transmission element is suspended on the upper side of the lock plate by the stepping motor assembly.

14. The door lock device according to claim 11, wherein the lock body comprises at least one assembly arm integrally extending upward from the lock plate, and the stepping motor assembly is assembled in the assembly arm.

15. The door lock device according to claim 11, wherein the hook has a first guide slope and a second guide slope corresponding to the first guide slope, the first guide slope of the hook has an obtuse angle included between an extension direction of the first guide slope and a sliding direction of the sliding transmission element, the second guide slope of the hook has an acute angle included between an extension direction of the second guide slope and the sliding direction of the sliding transmission element, the lock wall has a first abutting side and a second abutting side, the first abutting side and the second abutting side are opposite sides of the lock wall for defining the hook passage, wherein the first guide slope of the hook is abuttable against the first abutting side of the lock wall, and the second guide slope of the hook is abuttable against the second abutting side of the lock wall.

16. The door lock device according to claim 11, wherein at least one of the connecting end of the hook and one end portion of the sliding transmission element is rotatably mounted to the guide element.

17. Cooking appliance, characterized in that including: a cooking main body, wherein the cooking main body has a cooking space and a food material passage communicating with the cooking space; a door, wherein the door has a pivoting side, a locking side corresponding to the pivoting side, and a lock protrusion at the locking side, the pivoting side of the door is rotatably mounted to the cooking main body, and the door is capable of closing the food material passage of the cooking main body; and the door lock device according to any one of claims 11 to 16, wherein the door lock device is disposed in the cooking main body, and the hook of the door lock device is capable of releasing or hooking the lock protrusion of the door.

18. A door locking device characterized by including a step motor assembly and a lock body assembly, wherein the lock body assembly includes: a hook, wherein the hook has a connecting end and a hook-shaped locking end corresponding to the connecting end; a lock body, wherein the lock body includes a lock plate and a lock wall integrally extending upward from the lock plate, the lock plate has a guide groove and an arc-shaped groove, the lock wall has a hook passage, wherein a middle portion of the hook is swingably disposed in the hook passage of the lock wall; a sliding transmission element, wherein the sliding transmission element is slidably disposed in the lock plate, and one end portion of the sliding transmission element is rotatably mounted to the connecting end of the hook; and a guide element, wherein the guide element is disposed in the sliding transmission element, the guide element is slidably disposed in the guide groove of the lock plate; a rotating transmission element, wherein a bottom side of the rotating transmission element has a limiting protrusion, one position of the rotating transmission element is rotatably mounted to another end of the sliding transmission element, another position of the rotating transmission element is drivably mounted to an output shaft of the stepper motor assembly, the limiting protrusion of the rotating transmission element is slidably arranged in the arc-shaped slot of the lock plate, wherein when the stepper motor assembly drives the rotating transmission element to rotate, the rotating transmission element drives the lock hook to swing relative to the lock body through the sliding transmission element, and the limiting protrusion of the rotating transmission element can be blocked by the inner wall of the lock plate for forming the arc-shaped slot. wherein the lock body assembly comprises a mounting shaft, at least one of the sliding transmission element and the rotating transmission element is rotatably mounted to the mounting shaft, so that the sliding transmission element is rotatably mounted to the rotating transmission element.

19. The door lock device according to claim 18, wherein the rotating transmission element is suspended above the lock plate by the stepper motor assembly.

20. The door lock device according to claim 18 or 19, wherein the lock body comprises at least one assembly arm integrally extending upward from the lock plate, and the stepper motor assembly is assembled to the assembly arm.

21. The door lock device according to claim 18 or 19, wherein the rotating transmission element has a non-circular insertion hole, the output shaft of the stepper motor assembly is matched in shape and size with the insertion hole of the rotating transmission element, and the end of the output shaft of the stepper motor assembly is inserted into the insertion hole of the rotating transmission element, so that the rotating transmission element is drivably mounted to the output shaft of the stepper motor assembly.

22. The door lock device according to claim 18, wherein at least one of the connecting end of the lock hook and one end of the sliding transmission element is rotatably mounted to the guide element.

23. A cooking appliance characterized by, comprising: a cooking body, wherein the cooking body has a cooking space and a food material passage communicating with the cooking space; a door, wherein the door has a pivoting side, a locking side corresponding to the pivoting side, and a lock protrusion located at the locking side, the pivoting side of the door is rotatably mounted to the cooking body, and the door can close the food material passage of the cooking body; and the door lock device according to any one of claims 18 to 22, wherein the door lock device is arranged in the cooking body, and the lock hook of the door lock device can release or hook the lock protrusion of the door.

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