Electric oven door lock system with door state detection function and detection method

Abstract

The invention relates to the technical field of electric ovens, in particular to an electric oven door lock system and a detection method. The system comprises a box body, a door body, a controller and a door lock device, wherein the door lock device comprises a door lock actuator, a spring bolt, a matching part, a first detection switch and a second detection switch. The controller controls the door lock actuator to operate for a fixed time length T, and drives the spring bolt execution end to move to one of an unlocking direction, a successful locking direction and a door opening direction; meanwhile, a mechanical structure linked with the actuator triggers the two detection switches, and a specific on-off signal combination is formed at the end of T; the controller collects the combination and judges the state of the door body according to a preset mapping relation. The execution and detection functions are integrated in a single system, state judgment is achieved through the electric signals corresponding to the tail end position of the spring bolt, an additional door state sensor or a spring piece is not needed, and the system has the advantages of being simplified in structure, low in cost and high in detection reliability.

Description

Technical Field

[0001] This invention relates to the field of electric oven technology, and specifically to an electric oven door lock system and detection method. Background Technology

[0002] With the increasing functionality of household electric ovens, high-temperature or automatic operating modes such as high-temperature self-cleaning and timer start have become increasingly common. This places higher demands on the safety and reliability of ovens under specific operating conditions. In these operating states, the oven cavity may generate temperatures of several hundred degrees Celsius, or the oven may automatically start heating when unattended. If the oven door is not reliably locked and can be accidentally opened, there is a certain safety risk. Therefore, ensuring that the door is fully locked before operation under these modes is one of the technical issues of concern to those skilled in the art.

[0003] Currently, the common gate status detection solutions in the industry mainly fall into the following two categories: The first type of solution uses an independent door status detection switch, such as a microswitch or magnetic switch. This type of solution typically consists of a normally open microswitch installed on the door frame and a corresponding pressing protrusion on the door. When the door closes, the protrusion on the door compresses the microswitch's contact arm, causing its internal contacts to switch from an open state to a closed state, thus sending a "door closed" electrical signal back to the main control board. This solution is simple in structure and widely used, but it also exhibits certain limitations in some extended application scenarios. First, there is a balance between cost and long-term durability. Switches used for ordinary baking functions may face challenges in terms of lifespan and performance stability if subjected to the heat load and more frequent operation conditions associated with high-temperature self-cleaning mode; while using more durable switching components may increase material costs. Second, there is the limitation in the coverage of its detection logic. This solution mainly senses whether the door touches the switch, but its ability to determine deeper states such as whether the door is fully closed or whether the latch has been successfully engaged and locked in place is limited. In practical use, if the door is partially closed due to food debris, slight deformation, or not being pushed all the way in, the protrusions on the door may have triggered the detection switch, but the door is not fully locked. If the control system authorizes the oven to start high-temperature operation based solely on this single "door closed" signal, the completeness of its safety strategy still has room for improvement.

[0004] The second type of approach attempts to indirectly detect the door status through an additional mechanical transmission mechanism. For example, some designs employ a movable transmission component that is elastically connected to the door or door frame via a spring. When the door closes, the door pushes the transmission component against the spring force, causing displacement, which in turn triggers a fixed position switch at the end of the transmission component's movement. This approach aims to indirectly verify the door's closing action through the transmission of mechanical motion. However, the core component of this transmission mechanism—the spring—may gradually change its material properties under the long-term high temperature, high humidity, and frequent start-stop conditions of the electric oven, exhibiting phenomena such as fatigue or stress relaxation. This can lead to a weakening of the spring's elastic force or a change in its return stroke, potentially affecting the accuracy and consistency of the transmission component's triggering of the position switch. This uncertainty in the detection signal caused by changes in the performance of the core component is a factor that needs to be considered in the design and application of this type of approach.

[0005] In summary, existing gate control solutions offer different implementation paths for door status detection in electric ovens, each with its own applicable scenarios. However, when dealing with the more complex and demanding operating conditions of high-temperature ovens, achieving a good balance between ensuring detection reliability, long-term stability, and cost control remains a direction for continuous exploration and optimization by those skilled in the art. Summary of the Invention

[0006] The first objective of this invention is to solve the problems in existing oven door lock technology, which rely on independent door status detection switches, making it difficult to balance cost and reliability, and making it impossible to accurately detect the fully locked state of the door. The invention aims to provide an electric oven door lock system that is structurally integrated, has accurate detection capabilities, and is more cost-effective.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: An electric oven door lock system with door status detection function, the electric oven including a cabinet and a door, the door lock system including a controller and a door lock device, the door lock device including a door lock actuator, a latch, a mating part, a first detection switch and a second detection switch; the door lock actuator is disposed on the cabinet and electrically connected to the controller; the latch is mechanically connected to the output end of the door lock actuator; the mating part is used to be fixedly installed to the door and cooperates with the latch to achieve locking; the first detection switch and the second detection switch are both electrically connected to the controller; the output end of the door lock actuator is configured to trigger the first detection switch and the second detection switch by being in different mechanical positions during its movement, generating different on / off state signals; the controller is configured to control the door lock actuator to run for a fixed detection time T; after the detection time T ends, the signal combination of the first detection switch and the second detection switch is collected; according to the predefined mapping relationship between the signal combination and the door status, the door is determined to be in an unlocked state, a successfully locked state, or an open state.

[0008] This invention discloses an electric oven door lock system with door status detection function. Its working principle is as follows: The controller controls the door lock actuator to run for a fixed duration T, driving the bolt movement; the bolt actuator end, depending on whether the door is closed, eventually stops at one of three positions: unlocked, successfully locked, or open; simultaneously, a mechanical structure linked to the actuator output shaft triggers first and second detection switches as the angle changes, forming a specific on / off signal combination at the end of duration T; the controller collects this combination and determines the door status according to a preset mapping relationship, achieving security control. Compared with existing technologies, this invention integrates the execution and detection functions into the same system, eliminating the need for a separate door status sensor and avoiding reliance on elastic elements such as springs, thus avoiding detection reliability issues caused by fatigue or failure of elastic elements. This system determines the door status through a stable electrical signal corresponding to the bolt end position, which helps simplify the structure, reduce costs, and improve detection stability and system security.

[0009] Furthermore, the door lock actuator includes a door lock motor and a transmission shaft driven by the door lock motor; the transmission shaft includes, along its axial direction, a motor connection portion connected to the output shaft of the door lock motor, a switch trigger portion, and a lock tongue connection portion connected to the lock tongue; the switch trigger portion is configured to trigger the first detection switch and the second detection switch during rotation; the first detection switch and the second detection switch are arranged side by side along the axial direction of the transmission shaft; the switch trigger portion includes a first trigger protrusion and a second trigger protrusion, the axial position of the first trigger protrusion being aligned with the first detection switch, and relative to the second trigger protrusion... The second trigger protrusion is positioned closer to the door lock motor; its axial position is aligned with the second detection switch; the projections of the first and second trigger protrusions on the circumferential surface of the transmission shaft at least partially overlap; and the predefined signal combination is mapped to the door state as follows: when the first detection switch is open and the second detection switch is closed, it corresponds to the unlocking state; when both the first and second detection switches are closed, it corresponds to the successfully locked state; and when the first detection switch is closed and the second detection switch is open, it corresponds to the opening state. The latch's actuating end has three defined working positions, including a first position corresponding to the unlocking state, a second position corresponding to the successfully locked state (where the actuating end is blocked by the mating part when the door is closed), and a third position corresponding to the opening state (where the actuating end moves unobstructed until blocked by the limiting structure when the door is opened). In this solution, the door lock motor drives the transmission shaft to rotate, and this shaft is designed as a multi-functional camshaft integrating a switch trigger. By employing a specific layout where the first and second trigger protrusions on the shaft are axially parallel and their circumferential projections overlap, and precisely cooperating with two detection switches arranged offset along the axial direction, the shaft can dynamically generate three specific signal combinations—"open-closed," "closed-closed," and "closed-open"—based on its angular position during a single rotational motion. The controller can then directly map and determine the three door states: "unlocked," "successfully locked," and "open." This solution, through the specific layout of the dual trigger protrusions on the transmission shaft and the cooperation of the dual detection switches, unambiguously encodes the three physical positions of the latch into three specific electrical signal combinations, thus achieving a reliable mapping from mechanical position to electrical signals. This design highly integrates drive execution and state detection functions onto a single rotating shaft, eliminating the need for additional sensors, significantly improving the accuracy of state recognition and system reliability, while simplifying the structure and reducing costs.

[0010] Furthermore, the rotation of the transmission shaft drives the actuator of the locking tongue to switch between the first position, the second position, and the third position.

[0011] Furthermore, the controller is configured to: when it is determined that the door is in the open state, control the high-risk function module of the electric oven to stop working and generate an alarm signal. It should be noted that, in this invention, "high-risk function module" refers to a function module that is prohibited from being activated when the door is not reliably locked to prevent risks such as burns and fires. The high-risk function module includes: a heating module for cooking, a high-temperature self-cleaning module for cleaning, and a steam generating module for assisting cooking, etc.

[0012] Furthermore, the door body is provided with a door lock stop plate, and the mating part is located on the upper part of the door lock stop plate. The mating part and the body of the door lock stop plate form an L-shaped structure and a limiting groove, which cooperates with the actuating end of the lock tongue. In this solution, when the door body is closed and the actuating end of the lock tongue rotates to the locking position, this L-shaped structure can accurately guide the actuating end into the limiting groove, and use its inner sidewall as a mechanical blocking surface to capture and hold the actuating end in the locking position, thereby achieving stable and reliable physical locking and ensuring that the "successful locking state" directly and uniquely corresponds to the specific mechanical position of the lock tongue.

[0013] Furthermore, both the first and second trigger protrusions have circular outlines. The first trigger protrusion has a first recess on its circular outline, and the portion of its outer ring surface excluding the first recess forms a first trigger surface. The second trigger protrusion has a second recess on its circular outline, and the portion of its outer ring surface excluding the second recess forms a second trigger surface. The central angle corresponding to the first recess is larger than the central angle corresponding to the second recess. This solution precisely controls the effective trigger arc length by differentiating the size of the recesses on the two trigger protrusions, thereby matching their different functional requirements. The first detection switch, controlled by the first trigger protrusion, needs to remain closed in both "successfully locked" and "not closed" states. Therefore, its first recess is larger, resulting in a relatively shorter effective trigger arc length, ensuring that the switch can be reliably triggered within a large turning range without premature reset. Conversely, the second detection switch, controlled by the second trigger protrusion, is crucial in distinguishing between "successfully locked" and "not closed." Therefore, its second recess is designed to be extremely small, resulting in an exceptionally long effective trigger arc. This ensures that the switch will only reset and disconnect at specific, precise corner positions (i.e., the "not closed" fault point). This symmetrical design, with its subtle differences, forms the mechanical foundation for achieving low-cost, high-reliability status coding.

[0014] Furthermore, the latch is linear, with its opposite ends configured as a fixed end and an actuating end, respectively. The fixed end is fixedly connected to the latch connection portion of the transmission shaft; the actuating end extends from the fixed end; the actuating end is constructed with an outwardly bent L-shaped hook for hooking or disengaging from the mating portion. In this design, the latch body and the central axis of the transmission shaft are approximately coincident, ensuring direct transmission of driving force; while its actuating end is bent at a 90-degree right angle to the body, forming a standard L-shaped rigid lever. When the shaft rotates, this L-shaped structure converts the rotational motion of the shaft into an arc-shaped motion of the actuating end in the vertical plane, allowing it to rotate from a horizontal position to a vertically downward locking position. During this process, the vertically downward actuating end can precisely hook into the limiting groove of the door body mating portion, achieving physical locking through simple mechanical interference.

[0015] Furthermore, it also includes a mounting bracket, which includes a longitudinally arranged side seat and a transversely arranged base, as well as a first mounting portion and a second mounting portion; the side portion of the base is connected to the lower end of the side seat; the first mounting portion and the second mounting portion are formed between the side of the side seat near the base and the upper side of the base; the side seat is provided with a first through hole for the door lock motor output shaft to pass through; the second mounting portion is provided with a first locking portion for radially limiting the transmission shaft and a second locking portion for limiting the lock tongue; the first mounting portion is provided with a first buckle for fixing the first detection switch; the second mounting portion is provided with a second buckle for fixing the second detection switch. This solution provides a highly integrated and modular mounting bracket, consisting of a side seat, a base, and two mounting sections. Through a first through-hole, a first locking section, a second locking section, and two latches, the door lock motor, drive shaft, bolt, and two detection switches are precisely positioned and fixed, ensuring the reliability of each component working together under long-term vibration and high-temperature environments. It also forms a plug-and-play module that can be assembled independently, greatly improving production and maintenance efficiency. The drive, locking, and status detection functions are highly integrated into a compact mechanical unit. The ingenious design of the mechanical structure replaces independent door status sensors, significantly reducing system cost and complexity. Furthermore, by utilizing hard-wired feedback based on physical location and intelligent logic judgment, the accuracy, reliability, and security of status detection are improved.

[0016] Furthermore, the transmission shaft is hollow with both ends open, and connecting holes are provided on the upper and lower sides of its latch connection portion. The fixed end of the latch includes a first connecting rib and a second connecting rib arranged longitudinally, and a bent portion connecting the two. The first connecting rib, the bent portion, and the second connecting rib form a J-shaped structure. The first connecting rib passes through the connecting hole from bottom to top, and the second connecting rib is connected to the actuating end of the latch. The second locking portion is locked at the connection between the second connecting rib and the bent portion. The design of this solution combines its "lightweight and easy assembly" with the reliability design of "J-shaped positioning". Specifically, the transmission shaft adopts a hollow structure with both ends open, which can achieve: First, significantly reduce the weight of the shaft itself, thereby reducing its rotational inertia, reducing the load and power consumption of the door lock motor, and improving response speed and control efficiency; Second, the hollow structure facilitates the insertion and driving of the door lock motor output shaft from one end, simplifying the power connection method and making the assembly process more convenient. Meanwhile, the J-shaped structure at the fixed end of the latch (composed of a first connecting rib on the long side, a second connecting rib on the short side, and a bent portion at the bottom) mates with the connecting hole on the rotating shaft, ensuring reliable fixation of the latch. The second locking part on the mounting bracket precisely engages at the connection between the second connecting rib and the bent portion of the J-shaped structure. Its core function is to achieve radial limiting, effectively suppressing abnormal swinging of the latch during operation, ensuring the stability of its movement trajectory, and together with the lightweight design of the hollow rotating shaft, forming a highly efficient, stable, and easy-to-assemble drive and actuation module.

[0017] Furthermore, a limiting structure is provided between the switch trigger and the base, including a first limiting protrusion longitudinally disposed on the base and a second limiting protrusion disposed on the outer periphery of the switch trigger. The limiting structure is configured such that when the actuating end of the latch rotates to the third position, the second limiting protrusion abuts against one side of the first limiting protrusion; when the actuating end of the latch returns to the first position, the second limiting protrusion abuts against the other side of the first limiting protrusion. This solution achieves precise bidirectional control of the rotation angle of the transmission shaft through mechanical hard limiting. Specifically, the first limiting protrusion longitudinally disposed on the base acts as a fixed mechanical stop, cooperating with the fan-shaped second limiting protrusion that rotates together with the switch trigger. When the transmission shaft rotates, the two circumferential surfaces of its fan shape will contact and lock against the fixed first limiting protrusion in two opposite rotational directions, thereby forming a robust mechanical stop. This two-way hard limit mechanism can strictly limit the rotation range of the pivot within a preset safety angle, preventing excessive rotation of the pivot due to program misjudgment or drive failure. It effectively avoids mechanical damage to the latch, actuator and related components (for example, preventing the latch from hitting or jamming due to excessive rotation angle), ensuring the long-term reliability and durability of the entire door lock system.

[0018] Another objective of this invention is to provide a detection method based on the above-described electric oven door lock system, comprising the following steps: controlling the door lock actuator to run for a fixed detection duration T; within the detection duration T, driving the latch movement through the door lock actuator and triggering a first detection switch and a second detection switch to form a specific on / off signal combination; after the detection duration T ends, acquiring the signal combination of the first detection switch and the second detection switch; and determining, based on a predefined mapping relationship between the signal combination and the door state, whether the door is in an unlocked state, a successfully locked state, or an open state. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall door lock device; Figure 2 This is a breakdown diagram of the door lock device. Figure 1 ; Figure 3 This is a breakdown diagram of the door lock device. Figure 2 ; Figure 4 This is a schematic diagram of the transmission shaft. Figure 5 This is a structural diagram of an electric oven; Figure 6 This is a schematic diagram of the door structure. Figure 1 ; Figure 7 This is a schematic diagram of the door structure. Figure 2 ; Figure 8 This is a schematic diagram illustrating the principle of the locking tongue actuator being in the first position; Figure 9 This is a schematic diagram illustrating the principle of the locking tongue actuator being in the second position; Figure 10 This is a schematic diagram illustrating the principle of the locking tongue actuator being located in the third position.

[0020] Label Explanation: 11. Housing 12. Door 13. Clearance notch 14. Controller 2. Door lock device 15. Door lock actuator 3. Lock tongue 4. Fixed end 41. First connecting rib 411. Second connecting rib 413. Bending part 412. Actuating end 42. Door lock baffle 5. Fitting part 51. Limiting groove 511. Door body connecting part 52. Longitudinal connecting part 53. First detection switch 61. Second detection switch 62. Door lock motor 7. Transmission shaft 8. Motor connecting part 81. Switch trigger part 82. 83. Lock tongue connecting part, 84. First trigger protrusion, 841. First trigger curved surface, 85. Second trigger protrusion, 851. First recess, 86. Second recess, 87. Second limiting protrusion, 88. Connecting hole, 89. Mounting bracket, 91. Side seat, 92. Base, 94. First mounting part, 941. Second mounting part, 95. Second buckle, 951. First through hole, 96. First locking part, 97. Second locking part, 98. First limiting protrusion, 99. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings: In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "horizontal", "inner", and "outer" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] Example 1: See Figure 1-10 As shown, this embodiment discloses an electric oven door lock system with door status detection function. The electric oven includes a cabinet 11 and a door 12. The door lock system includes a controller 2 and a door lock device 14. The door lock device 14 includes a door lock actuator 3, a latch 4, a mating part 51, a first detection switch 61, and a second detection switch 62. The door lock actuator 3 is disposed on the cabinet 11 and electrically connected to the controller 2. The latch 4 is mechanically connected to the output end of the door lock actuator 3. The mating part 51 is used for fixed installation to the door 12 and cooperates with the latch 4 to achieve locking. The first detection switch 61 and the second detection switch 62... All switches 62 are electrically connected to controller 2; the output of door lock actuator 3 is configured to trigger the first detection switch 61 and the second detection switch 62 by being in different mechanical positions during its movement, generating different on / off state signals; controller 2 is configured to control door lock actuator 3 to run for a fixed detection time T; after the detection time T ends, it collects the signal combination of the first detection switch 61 and the second detection switch 62; according to the predefined mapping relationship between the signal combination and the state of door 12, it determines whether door 12 is in the unlocked state, successfully locked state, or open state.

[0023] In one specific embodiment, T ranges from 2 to 6 seconds.

[0024] The aforementioned door lock actuator 3 includes a door lock motor 7 and a transmission shaft 8 driven by the door lock motor 7. The transmission shaft 8 includes, along its axial direction, a motor connection portion 81 connected to the output shaft of the door lock motor 7, a switch trigger portion 82, and a latch connection portion 83 connected to the latch 4. The switch trigger portion 82 is configured to trigger a first detection switch 61 and a second detection switch 62 during rotation. The first detection switch 61 and the second detection switch 62 are arranged side-by-side along the axial direction of the transmission shaft 8. The switch trigger portion 82 includes a first trigger protrusion 84 and a second trigger protrusion 85. The axial position of the first trigger protrusion 84 is aligned with the first detection switch 61, and compared to... The second trigger protrusion 85 is closer to the door lock motor 7; the axial position of the second trigger protrusion 85 is aligned with the second detection switch 62; the projections of the first trigger protrusion 84 and the second trigger protrusion 85 on the circumferential surface of the transmission shaft 8 at least partially overlap; and the predefined signal combination mapping relationship with the state of the door 12 is as follows: when the first detection switch 61 is in the open state and the second detection switch 62 is in the closed state, it corresponds to the unlocked state; when both the first detection switch 61 and the second detection switch 62 are in the closed state, it corresponds to the successfully locked state; when the first detection switch 61 is in the closed state and the second detection switch 62 is in the open state, it corresponds to the open state. The actuator 42 of the latch 4 has three defined working positions, including the first position corresponding to the unlocked state, the second position corresponding to the successfully locked state, where the actuator 42 is blocked by the mating part 51 and stops there when the door 12 is closed; and the third position corresponding to the open state, where the actuator 42 moves unobstructed until it is blocked by the limiting structure and stops there when the door 12 is opened. In this design, the door lock motor 7 drives the transmission shaft 8 to rotate. This shaft is designed as a multi-functional camshaft integrating a switch trigger unit 82. Through a specific layout where the first trigger protrusion 84 and the second trigger protrusion 85 on the shaft are axially parallel and their circumferential projections overlap, and precisely cooperate with two detection switches arranged offset along the axial direction, the shaft can dynamically generate three specific signal combinations—"open-closed," "closed-closed," and "closed-open"—based on its angular position during a single rotational motion. The controller 2 can then directly map and determine the three door body 12 states: "unlocked," "successfully locked," and "open." This design, through the specific layout of the dual trigger protrusions on the transmission shaft 8 and the cooperation of the dual detection switches, unambiguously encodes the three physical positions of the latch 4 into three specific electrical signal combinations, thus achieving a reliable mapping from mechanical position to electrical signal. This design highly integrates drive execution and state detection functions onto a single rotating shaft, eliminating the need for additional sensors, significantly improving the accuracy of state recognition and system reliability, while simplifying the structure and reducing costs.

[0025] The rotation of the aforementioned transmission shaft 8 drives the actuator 42 of the locking tongue 4 to switch between the first position, the second position, and the third position.

[0026] The controller 2 is configured to stop the high-risk function module of the electric oven and generate an alarm signal when it is determined that the door 12 is open. It should be noted that in this invention, "high-risk function module" refers to a function module that is prohibited from being activated when the door 12 is not reliably locked to prevent risks such as burns and fires. High-risk function modules include: a heating module for cooking, a high-temperature self-cleaning module for cleaning, and a steam generating module for assisting cooking, etc.

[0027] The door body 12 is provided with a door lock stop plate 5, and a mating part 51 is provided on the upper part of the door lock stop plate 5. The mating part 51 and the body of the door lock stop plate 5 form an L-shaped structure and a limiting groove 511. The limiting groove 511 is used to cooperate with the actuating end 42 of the latch 4. In this solution, when the door body 12 is closed and the actuating end 42 of the latch 4 rotates to the locking position, this L-shaped structure can accurately guide the actuating end 42 into the limiting groove 511, and use its inner side wall as a mechanical blocking surface to capture and hold the actuating end 42 in the locking position, thereby achieving stable and reliable physical locking and ensuring that the "successful locking state" directly and uniquely corresponds to the specific mechanical position of the latch 4.

[0028] The aforementioned door lock stop plate 5 has a horizontally arranged mating part 51 and a door body connecting part 52, as well as a longitudinal connecting part 53 connecting the two. The door body connecting part 52 is provided with a screw through hole for connecting to the door body 12, and an L-shaped structure is formed between the mating part 51 and the longitudinal connecting part 53.

[0029] The upper part of the aforementioned door body 12 is provided with a clamping cavity, and the door lock baffle 5 is located in the clamping cavity. The upper end of the clamping cavity is provided with an clearance notch 13 corresponding to the position of the door lock baffle 5.

[0030] Both the first trigger protrusion 84 and the second trigger protrusion 85 have circular outlines. The first trigger protrusion 84 has a first recess 86 on its circular outline, and the portion of its outer ring surface excluding the first recess 86 constitutes the first trigger surface 841. The second trigger protrusion 85 has a second recess 87 on its circular outline, and the portion of its outer ring surface excluding the second recess 87 constitutes the second trigger surface 851. The central angle corresponding to the first recess 86 is larger than the central angle corresponding to the second recess 87. This solution precisely controls the effective trigger arc length by differentiating the size of the recesses on the two trigger protrusions, thereby matching their different functional requirements. The first detection switch 61, controlled by the first trigger protrusion 84, needs to remain closed in both "successfully locked" and "not closed" states. Therefore, its first recess 86 is larger, resulting in a relatively shorter effective trigger arc length, ensuring that the switch can be reliably triggered within a large turning angle range without premature reset. Conversely, the second detection switch 62, controlled by the second trigger protrusion 85, is crucial in distinguishing between "successfully locked" and "not closed." Therefore, its second recess 87 is designed to be extremely small, resulting in an extremely long effective trigger arc length. This ensures that the switch will only reset and disconnect at specific, precise corner positions (i.e., the "not closed" fault point). This symmetrical design, with its "minor differences," is the mechanical foundation for achieving low-cost, high-reliability status coding.

[0031] The aforementioned latch 4 is linear, with its opposite ends configured as a fixed end 41 and an actuating end 42. The fixed end 41 is fixedly connected to the latch connection part 83 of the transmission shaft 8; the actuating end 42 extends from the fixed end 41 and is constructed with an outwardly bent L-shaped hook for hooking or disengaging from the mating part 51. In this design, the main body of the latch 4 coincides with the central axis of the transmission shaft 8, ensuring direct transmission of driving force; while its actuating end 42 is bent at a 90-degree right angle to the main body, forming a standard L-shaped rigid lever. When the shaft rotates, this L-shaped structure converts the rotational motion of the shaft 8 into an arc-shaped motion of the actuating end 42 in the vertical plane, allowing it to rotate from a horizontal position to a vertically downward locking position. During this process, the vertically downward actuating end 42 can precisely hook into the limiting groove 511 of the mating part 51 of the door body 12, achieving physical locking through simple mechanical interference.

[0032] The aforementioned door lock device 14 also includes a mounting bracket 9, which includes a longitudinally arranged side seat 91 and a transversely arranged base 92, as well as a first mounting part 94 and a second mounting part 95. The side of the base 92 is connected to the lower end of the side seat 91. The first mounting part 94 and the second mounting part 95 are formed between the side of the side seat 91 near the base 92 and the upper side of the base 92. The side seat 91 is provided with a first through hole 96 for the output shaft of the door lock motor 7 to pass through. The second mounting part 95 is provided with a first locking part 97 for radially limiting the transmission shaft 8 and a second locking part 98 for limiting the lock tongue 4. The first mounting part 94 is provided with a first buckle 941 for fixing the first detection switch 61. The second mounting part 95 is provided with a second buckle 951 for fixing the second detection switch 62. This solution provides a highly integrated and modular mounting bracket 9, which consists of a side seat 91, a base 92, and two mounting parts. Through a first through hole 96, a first locking part 97, a second locking part 98, and two buckles, the door lock motor 7, the transmission shaft 8, the lock tongue 4, and the two detection switches are precisely positioned and fixed, ensuring the reliability of each component working together under long-term vibration and high-temperature environments. At the same time, it forms a "plug-and-play" module that can be assembled independently, greatly improving production and maintenance efficiency. The drive, locking, and status detection functions are highly integrated into a compact mechanical unit. The ingenious design of the mechanical structure replaces the independent door status sensor, significantly reducing system cost and complexity. At the same time, the use of hard-wired feedback based on physical location and intelligent logic judgment improves the accuracy, reliability, and security of status detection.

[0033] The aforementioned transmission shaft 8 is hollow with both ends open, and its locking tongue connecting part 83 has corresponding connecting holes 89 on its upper and lower sides; the fixed end 41 of the locking tongue 4 includes a first connecting rib 411 and a second connecting rib 413 arranged longitudinally, and a bent part 412 connecting the two. The first connecting rib 411, the bent part 412 and the second connecting rib 413 form a J-shaped structure. The first connecting rib 411 passes through the connecting hole 89 from bottom to top, and the second connecting rib 413 is connected to the actuating end 42 of the locking tongue 4; the second locking part 98 is locked at the connection between the second connecting rib 413 and the bent part 412. The design of this solution combines its "lightweight and easy assembly" with the reliability design of "J-shaped positioning". Specifically, the drive shaft 8 adopts a hollow structure with both ends open, which achieves the following: First, it significantly reduces the weight of the shaft itself, thereby reducing its moment of inertia, reducing the load and power consumption of the door lock motor 7, and improving response speed and control efficiency; Second, this hollow structure facilitates the insertion and driving of the output shaft of the door lock motor 7 from one end, simplifying the power connection method and making the assembly process more convenient. At the same time, the J-shaped structure of the fixed end 41 of the latch 4 (composed of the first connecting rib 411 on the long side, the second connecting rib 413 on the short side, and the bent part 412 at the bottom) cooperates with the connecting hole 89 on the shaft to achieve reliable fixing of the latch 4. The second locking part 98 on the mounting bracket 9 precisely engages at the connection between the second connecting rib 413 and the bent part 412 of the J-shaped structure. Its core function is to achieve radial limiting, effectively suppressing abnormal swinging of the latch 4 during operation, ensuring the stability of its movement trajectory, and together with the lightweight design of the hollow shaft, it constitutes an efficient, stable, and easy-to-assemble drive and execution module.

[0034] A limiting structure is provided between the aforementioned switch trigger part 82 and the base 92, including a first limiting protrusion 99 longitudinally disposed on the base 92 and a second limiting protrusion 88 disposed on the outer periphery of the switch trigger part 82. The limiting structure is configured such that when the actuating end 42 of the locking tongue 4 rotates to the third position, the second limiting protrusion 88 abuts against the first limiting protrusion 99 to prevent further rotation. This solution achieves precise bidirectional control of the rotation angle of the transmission shaft 8 through mechanical hard limiting. Specifically, the first limiting protrusion 99 longitudinally disposed on the base 92 acts as a fixed mechanical stop, cooperating with the fan-shaped second limiting protrusion 88 that rotates together with the switch trigger part 82. When the transmission shaft 8 rotates, its two fan-shaped circumferential surfaces will contact and lock against the fixed first limiting protrusion 99 in two opposite rotational directions, thereby forming a robust mechanical stop. This two-way hard limit mechanism can strictly limit the rotation range of the pivot within a preset safety angle, preventing excessive rotation of the pivot due to program misjudgment or drive failure. It effectively avoids mechanical damage to the latch 4, actuator and related components (for example, preventing the latch 4 from hitting or jamming due to excessive rotation angle), ensuring the long-term reliability and durability of the entire door lock system.

[0035] The central angle corresponding to the first concave position 86 is θ_avoid1, and the central angle corresponding to the first trigger surface 841 is θ_act1. The ratio coefficient between the two satisfies: K1 = θ_avoid1 / θ_act1, and 0.8 ≤ K1 ≤ 4; the central angle corresponding to the second concave position 87 is θ_avoid2, and the central angle corresponding to the second trigger surface 851 is θ_act2. The ratio coefficient between the two satisfies: K2 = θ_avoid2 / θ_act2, and 0.8 ≤ K1 ≤ 4. <K2 ≤ 0.5。

[0036] This invention discloses an electric oven door lock system with door status detection function. Its working principle is as follows: Controller 2 controls the door lock actuator 3 to run for a fixed detection time T, driving the latch 4 to move; the actuator end 42 of the latch, depending on whether the door 12 is closed, eventually stops at one of three working positions: unlocked, successfully locked, or open; simultaneously, a mechanical structure linked to the actuator output shaft triggers the first detection switch 61 and the second detection switch 62 as the angle changes, forming a specific on / off signal combination at the end of the detection time T; Controller 2 collects this signal combination and determines whether the door 12 is in an unlocked, successfully locked, or open state according to a preset mapping relationship, thereby achieving security control. Compared with existing technologies, this invention integrates the actuator and status detection function into the same system, without relying on a separate door status sensor or using elastic transmission elements such as springs, thus avoiding the impact of changes in the performance of elastic elements on detection stability. This system determines the door status through the electrical signal combination corresponding to the position of the latch end, which helps simplify the structure, reduce costs, and improve the reliability of detection and the overall security of the system.

[0037] Example 2: This embodiment discloses a detection method based on the electric oven door lock system of Embodiment 1, and includes the following steps: controlling the door lock actuator 3 to run for a fixed detection time T; during the detection time T, driving the latch 4 to move through the door lock actuator 3, and triggering the first detection switch 61 and the second detection switch 62 to form a specific on / off signal combination; after the detection time T ends, collecting the signal combination of the first detection switch 61 and the second detection switch 62; and determining whether the door 12 is in an unlocked state, a successfully locked state, or an open state based on the predefined mapping relationship between the signal combination and the state of the door 12.

[0038] Furthermore, the above methods specifically include: Step S1: Trigger Detection. When the controller 2 receives a work instruction that requires ensuring the door 12 is in the locked state, it initiates a door status detection process; the work instruction includes, but is not limited to, a self-cleaning mode start instruction or a scheduled cooking start instruction.

[0039] Step S2: Drive the actuator. Controller 2 controls the door lock motor 7 to run for a fixed detection time T.

[0040] Step S3: Mechanical linkage and status coding. Within the detection time T: The door lock motor 7 drives the transmission shaft 8 to rotate; The transmission shaft 8 drives the actuator end 42 of the latch 4 to rotate from the initial unlocking position to the locking position through the latch connection part 83; If the door 12 is in the closed state, the actuator 42 is blocked by the limiting groove 511 of the door lock baffle 5, so that the transmission shaft 8 stops stably in the locked position. At this time, the switch triggering part 82 triggers the first detection switch 61 and the second detection switch 62 to be in the closed state. If the door 12 is in the open state, the actuator 42 will continue to rotate beyond the locked position without obstruction until it is blocked by the limiting structure at the open position. At this time, the switch triggering part 82 triggers the first detection switch 61 to be in the closed state and the second detection switch 62 to be in the open state.

[0041] Step S4: Signal Acquisition and Judgment. At the end of the detection duration T, controller 2 performs the following operations: Stop supplying power to the door lock motor 7; Collect the instantaneous signal combination of the first detection switch 61 and the second detection switch 62; The signal combination is compared with a predefined mapping relationship to determine the gate state: If the signal combination is (open, closed), then it is determined to be in an unlocked state; If the signal combination is (closed, closed), then it is determined to be a successful locking state; If the signal combination is (closed, open), then it is determined to be an open door state.

[0042] Step S5: Security Control. Controller 2 executes the security policy based on the determination result of step S4: If the lockout status is determined to be successful, the high-risk functional modules of the electric oven are authorized to start or continue to work. If the door is determined to be in an open or unlocked state, the high-risk functional modules will be prohibited from starting or will be immediately stopped, and an alarm signal will be generated.

[0043] The status inspection method provided by this invention uses a highly integrated door lock system as its hardware architecture, combining mechanical transmission, position detection, and intelligent control logic to form an automatic and accurate status verification process. This method improves the stability of signal acquisition by setting a detection duration and utilizes the stable mapping relationship between the bolt end position and the combination of dual switch signals to achieve hard-wired feedback and deterministic determination of the door's locking status. This method can convert physical states into system-level safety control commands without relying on additional independent door status sensors. While simplifying the system structure and operation process, it effectively improves the safety protection capabilities of the electric oven under high-temperature and self-cleaning operating modes.

[0044] Based on the content and principles disclosed in the above specification, those skilled in the art can make various changes, modifications, or substitutions to the specific embodiments described above without departing from the essence and scope of the invention. Therefore, the invention is not limited to the specific embodiments and drawings disclosed herein. Any changes, equivalent substitutions, or improvements made within the scope of protection defined in the claims should be included within the scope of protection of the invention. Furthermore, although specific technical terms or expressions may be used in the specification, this is only for the purpose of facilitating description and understanding of the invention and is not intended to limit the scope of the invention. Similar or identical parts between the various embodiments in this specification can be referred to mutually; differences are emphasized in terms of improvements and beneficial effects.

Claims

1. An electric oven door lock system with door status detection function, the electric oven comprising a cabinet and a door, characterized in that, The door lock system includes a controller and a door lock device, the door lock device comprising: A door lock actuator is mounted on the housing and electrically connected to the controller; The latch is mechanically connected to the output end of the door lock actuator; The mating part is used to be fixedly installed to the door body and to cooperate with the locking tongue to achieve locking; Both the first detection switch and the second detection switch are electrically connected to the controller; The output of the door lock actuator is configured to trigger the first and second detection switches by being in different mechanical positions during its movement, thereby generating different on / off state signals. The controller is configured to: The door lock actuator is controlled to run for a fixed detection time T; After the detection duration T ends, the signal combination of the first detection switch and the second detection switch is collected; Based on the predefined mapping relationship between signal combinations and door status, it is determined whether the door is in an unlocked state, a successfully locked state, or an open state.

2. The electric oven door lock system according to claim 1, characterized in that, The door lock actuator includes a door lock motor and a transmission shaft driven by the door lock motor; The transmission shaft includes, in sequence along the axial direction, a motor connection part connected to the output shaft of the door lock motor, a switch trigger part, and a lock tongue connection part connected to the lock tongue; The switch triggering unit is configured to trigger the first detection switch and the second detection switch during rotation; The first detection switch and the second detection switch are arranged side by side along the axial direction of the transmission shaft; The switch trigger unit includes: The first trigger protrusion is aligned axially with the first detection switch and is closer to the door lock motor than the second trigger protrusion. The second trigger protrusion is aligned axially with the second detection switch. The projections of the first trigger protrusion and the second trigger protrusion on the circumferential surface of the transmission shaft at least partially overlap; Furthermore, the mapping relationship between the predefined signal combination and the gate state is as follows: When the first detection switch is in the off state and the second detection switch is in the closed state, it corresponds to the unlocking state; When both the first detection switch and the second detection switch are in the closed state, it corresponds to the successful locking state; When the first detection switch is closed and the second detection switch is open, it corresponds to the door opening state; The locking tongue has three defined working positions: The first position corresponds to the unlocked state; In the second position, when the door is closed, the actuator is blocked by the mating part and stays in this position, corresponding to the successful locking state; In the third position, when the door is opened, the actuator moves without obstruction until it is stopped by the limiting structure and stops in this position, corresponding to the door opening state.

3. The electric oven door lock system according to claim 2, characterized in that, The rotation of the transmission shaft drives the actuator of the locking tongue to switch between the first position, the second position, and the third position.

4. The electric oven door lock system according to claim 2, characterized in that, The door body is provided with a door lock stop plate, and the mating part is provided on the upper part of the door lock stop plate. The mating part and the body of the door lock stop plate form an L-shaped structure and form a limiting groove, which cooperates with the actuating end of the lock tongue through the limiting groove.

5. The electric oven door lock system according to claim 2, characterized in that, Both the first trigger protrusion and the second trigger protrusion have circular outlines. The first trigger protrusion has a first recess on its circular outline, and the portion of its outer ring surface excluding the first recess constitutes the first trigger surface. The second trigger protrusion has a second recess on its circular outline, and the portion of its outer ring surface other than the second recess constitutes the second trigger surface. The central angle corresponding to the first concave position is greater than the central angle corresponding to the second concave position.

6. The electric oven door lock system according to claim 2, characterized in that, The latch is linear, with its opposite ends configured as a fixed end and an actuating end, respectively. The fixed end is fixedly connected to the latch connection part of the transmission shaft. An actuating end extends from the fixed end; the actuating end is configured to have an outwardly bent L-shaped hook for hooking or disengaging from the mating part.

7. The electric oven door lock system according to claim 2, characterized in that, It also includes a mounting bracket, the mounting bracket comprising: Longitudinal side seats; A horizontally positioned base, the side of which is connected to the lower end of the side seat; The first mounting part and the second mounting part are formed between the side of the side seat near the base and the upper side of the base; The side seat is provided with a first through hole for the output shaft of the door lock motor to pass through; The second mounting part is provided with a first locking part for radially limiting the transmission shaft and a second locking part for limiting the locking tongue; The first mounting part is provided with a first buckle for fixing the first detection switch; The second mounting part is provided with a second clip for fixing the second detection switch.

8. The electric oven door lock system according to claim 7, characterized in that, The transmission shaft is hollow with both ends open, and the upper and lower sides of its locking tongue connection part are provided with corresponding connecting holes. The fixed end of the latch includes a first connecting rib and a second connecting rib arranged longitudinally, and a bent portion connecting the two. The first connecting rib, the bent portion and the second connecting rib form a J-shaped structure. The first connecting rib passes through the connecting hole from bottom to top, and the second connecting rib is connected to the actuating end of the latch. The second locking part is locked at the connection between the second connecting rib and the bent part.

9. The electric oven door lock system according to claim 2, characterized in that, A limiting structure is provided between the switch trigger part and the base, including a first limiting protrusion arranged longitudinally on the base, and a second limiting protrusion arranged on the outer periphery of the switch trigger part; The limiting structure is configured such that when the actuating end of the latch rotates to the third position, the second limiting protrusion abuts against one side of the first limiting protrusion; and when the actuating end of the latch returns to the first position, the second limiting protrusion abuts against the other side of the first limiting protrusion.

10. A detection method based on the electric oven door lock system according to any one of claims 1-9, characterized in that, Includes the following steps: Control the door lock actuator to run for a fixed detection time T; During the detection time T, the door lock actuator drives the bolt to move, triggering the first detection switch and the second detection switch to form a specific on / off signal combination; After the detection duration T ends, the signal combination of the first detection switch and the second detection switch is collected; Based on the predefined mapping relationship between signal combinations and door status, it is determined whether the door is in an unlocked state, a successfully locked state, or an open state.

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