Gas stove timer and control method thereof

Abstract

The invention discloses a gas stove timer and a control method thereof. The gas stove timer comprises a mounting base (1) and a movable main body (2) capable of axially moving along the mounting base (1), the movable main body (2) comprises a lower shell (21) and a knob (22) which are coaxially arranged; the knob (22) is in running fit with the lower shell (21); a connecting shaft sleeve (221) matched with a gas stove switch shaft is arranged on the knob (22); through reasonable structural layout and component connection relation, the gas stove switch has the advantages that the structure is compact, the component layout is compact, miniaturization is easy to realize, coaxial installation of the whole machine and the gas stove switch shaft can be realized, the control logic is simple, stable and efficient, the adaptability to installation of different gas stove switches is good, the number of components is small, the structure is simple, and installation and use are convenient; and popularization and use are facilitated.

Description

Technical Field

[0002] The invention relates to the technical field of gas stove timers, in particular to a gas stove timer and a control method thereof. Background Art

[0003] A gas stove timer is an auxiliary device that can turn off the gas stove switch after a set time. At present, most gas stoves on the market do not have a timing device. Therefore, problems such as water drying up, food burning, and pot burning often occur. Even fires are caused by forgetting to turn off the gas stove, resulting in huge property losses and casualties.

[0004] Although there are some mechanical or electronic gas stove timers in the prior art, they have defects such as large installation volume, complex structure and control logic, high failure rate and low installation efficiency. Since the switch distances of different gas stoves are different, the large volume will result in poor adaptability to gas stoves on the market. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems in the prior art to a certain extent: to provide a gas stove timer with a compact structure, which is conducive to miniaturization, has good installation adaptability, a simple structure, and is easy to install and use; and at the same time to provide a control method for a gas stove timer with simple control logic, stability and high efficiency.

[0006] The technical solution of the present invention is as follows: a gas stove timer, comprising a mounting base and a movable body that can move axially along the mounting base; the movable body comprises a lower shell and a knob that are coaxially arranged; the knob and the lower shell are rotatably matched; the knob is provided with a connecting sleeve that is matched with the gas stove switch shaft; a driven gear is coaxially arranged inside the knob; the driven gear is rotatably matched with the knob; The lower shell is provided with a sleeve that is rotatably matched with the connecting sleeve; the lower shell is provided with a motor; the output shaft of the motor is connected to the driving gear; the driving gear is meshed with the driven gear member; The knob is provided with a controller, a timer and a flame-off sensor; the timer, the flame-off sensor and the motor are all electrically connected to the controller.

[0007] As an optimization, the fire-off sensor is a micro switch, and the sleeve is provided with a protrusion that cooperates with the micro switch; when the knob is rotated until the micro switch is triggered by the protrusion; the angular position of the knob relative to the lower shell is the fire-off position of the gas stove switch axis.

[0008] As an optimization, the knob is further provided with a gear reset sensor electrically connected to the controller; the gear reset sensor is used to detect whether the driven gear member reaches a preset reset angle relative to the knob.

[0009] As an optimization, the gear reset sensor is a touch switch, and the driven gear member is provided with a protrusion that cooperates with the touch switch; when the driven gear member rotates until the protrusion triggers the touch switch; the driven gear member reaches a preset reset angle relative to the knob.

[0010] As an optimization, the driven gear member is axially limited between the lower shell and the knob; the side wall of the driven gear member is rotatably matched with the lower shell.

[0011] As an optimization, the connecting sleeve is sleeved with the sleeve; the upper end of the connecting sleeve is fixedly connected to the knob, and the lower end of the connecting sleeve is provided with a flange for axially limiting the lower shell.

[0012] Preferably, the driven gear member comprises a gear ring and a top wall, the top wall is provided with a fan-shaped hollow around the connecting sleeve; a blocking column is provided on the knob; and an end of the blocking column is located in the fan-shaped hollow.

[0013] As an optimization, the mounting base cooperates with the axial movement of the bottom of the lower shell; the bottom of the lower shell is coaxially sleeved with the mounting base; the bottom of the mounting base is provided with an opening for the gas stove switch shaft to pass through; the bottom of the mounting base is provided with a plurality of limit buckles around the opening, and the bottom of the lower shell is provided with a socket corresponding to the limit buckle; the limit buckle is buckled into the socket to limit the maximum range of axial movement of the mounting base and the lower shell.

[0014] As an optimization, the mounting base is matched with the bottom circumferential limit of the lower shell; the inner wall of the mounting base is provided with a guide rib; the outer wall of the lower shell is provided with a guide groove matched with the guide rib.

[0015] As an optimization, a detachable sleeve coaxially matched with the gas stove switch shaft is provided inside the connecting sleeve, and a depth adjustment bolt is provided inside the detachable sleeve; an internal thread section matching with the thread of the depth adjustment bolt is provided at the upper end of the detachable sleeve; the cross-section of the hole at the lower end of the detachable sleeve matches the cross-section of the gas stove switch shaft; the minimum inner diameter of the internal thread section of the detachable sleeve is larger than the maximum outer diameter of the gas stove switch shaft.

[0016] As an optimization, the knob is also provided with a display screen, a power supply and a potentiometer electrically connected to the controller; the display screen is used to display the timer time; the potentiometer input shaft is connected to the adjustment knob for adjusting the timing time; the motor is connected to the drive gear through a gear reduction box.

[0017] The present invention also provides a method for controlling the gas stove timer, comprising the following steps: 1) When the controller is powered on and reset, the controller controls the motor to drive the knob and the driven gear member to reset to the initial state, that is, the controller first starts the motor to drive the driven gear member to rotate until the micro switch is triggered by the protrusion; then controls the motor to reverse and drive the driven gear member to rotate until the protrusion triggers the touch switch, and then stops the motor; 2) The controller detects the potentiometer input in real time, sets the timing time according to the potentiometer input and displays it on the display screen, then enters the countdown and turns off the display screen, and the controller detects the triggering status of the micro switch and the touch switch in real time. When it is detected that both the micro switch and the touch switch are in the triggered state, the timer time is cleared, indicating that the gas stove timer is manually restored to the initial state; otherwise, after the timing time is reached, the controller first starts the motor to drive the driven gear part to rotate until the micro switch is triggered by the protrusion; at this time, the gas stove switch shaft has turned off the gas, and then controls the motor to reverse and drive the driven gear part to rotate until the protrusion triggers the touch switch, and then stops the motor, and the gas stove timer is restored to the initial state.

[0018] The present invention has the following beneficial effects: the present invention realizes a compact structure through reasonable structural layout and component connection relationship, the component layout is compact and easy to achieve miniaturization, the whole machine can be installed coaxially with the gas stove switch axis, the control logic is simple and stable and efficient, the installation adaptability to different gas stove switches is good, the number of components is small, the structure is simple and the installation is easy to use, and it is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the gas stove timer in the embodiment.

[0020] Figure 2-6 Schematic diagram of the explosion of the gas stove timer in the embodiment.

[0021] Figure 7 Schematic diagram of the matching structure of the knob and the driven gear of the gas stove timer in the embodiment.

[0022] Figure 8 It is a cross-sectional schematic diagram of the installation state of the gas stove timer in the embodiment.

[0023] Fig. 9 It is a schematic diagram of the three-dimensional cross-sectional structure of the gas stove timer in the embodiment.

[0024] Fig.10 Schematic diagram of the cross-sectional structure of the gas stove timer in the embodiment.

[0025] Among them, 1. mounting base; 11. opening; 12. limit buckle; 13. guide rib; 2. movable body; 21. lower shell; 211. sleeve; 212. motor; 213. driving gear; 214. protrusion; 215. socket; 216. guide groove; 22. knob; 221. connecting sleeve; 222. flame-off sensor; 223. gear reset sensor; 224. blocking column; 225. detachable sleeve; 226. depth adjustment bolt; 227. display screen; 228. power supply; 229. adjustment knob; 2210. motor terminal; 3. driven gear member; 31. protrusion; 32. fan-shaped hollow. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. Example

[0027] Now combined Figure 1-10 A gas stove timer is described, comprising a mounting base 1 and a movable body 2 that can move axially along the mounting base 1; the movable body 2 comprises a lower shell 21 and a knob 22 that are coaxially arranged; the knob 22 is rotatably matched with the lower shell 21; the knob 22 is provided with a connecting sleeve 221 that is matched with the switch shaft of the gas stove; a driven gear member 3 is coaxially arranged inside the knob 22; the driven gear member 3 is rotatably matched with the knob 22; The lower shell 21 is provided with a sleeve 211 that rotates with the connecting sleeve 221; the lower shell 21 is provided with a motor 212; the output shaft of the motor 212 is connected to the driving gear 213; the driving gear 213 is meshed with the driven gear member 3; The knob 22 is provided with a controller, a timer, and a flame-off sensor 222 ; the timer, the flame-off sensor 222 , and the motor 212 are all electrically connected to the controller.

[0028] The fire-off sensor 222 is a micro switch, and the sleeve 211 is provided with a protrusion 214 that cooperates with the micro switch; when the knob 22 is rotated until the micro switch is triggered by the protrusion 214; the angular position of the knob 22 relative to the lower shell 21 is the fire-off position of the gas stove switch axis.

[0029] The knob 22 is also provided with a gear reset sensor 223 electrically connected to the controller; the gear reset sensor 223 is used to detect whether the driven gear member 3 has reached a preset reset angle relative to the knob 22 .

[0030] The gear reset sensor 223 is a touch switch, and the driven gear member 3 is provided with a protrusion 31 that cooperates with the touch switch; when the driven gear member 3 rotates until the protrusion 31 triggers the touch switch, the touch switch is in a closed state; the driven gear member 3 reaches a preset reset angle relative to the knob 22.

[0031] The driven gear member 3 is axially limited between the lower shell 21 and the knob 22 ; the side wall of the driven gear member 3 is rotatably matched with the lower shell 21 .

[0032] The connecting sleeve 221 is sleeved with the sleeve 211 ; the upper end of the connecting sleeve 221 is fixedly connected to the knob 22 , and the lower end of the connecting sleeve 221 is provided with a flange for axially limiting the lower shell 21 .

[0033] The driven gear member 3 includes a gear ring and a top wall. A fan-shaped hollow 32 is provided on the top wall around the connecting sleeve 221 . A blocking column 224 is provided on the knob 22 . The end of the blocking column 224 is located in the fan-shaped hollow 32 .

[0034] The mounting base 1 cooperates with the bottom of the lower shell 21 for axial movement; the bottom of the lower shell 21 is coaxially sleeved with the mounting base 1; the bottom of the mounting base 1 is provided with an opening 11 for the gas stove switch shaft to pass through; the bottom of the mounting base 1 is provided with 4 limit buckles 12 around the opening 11, and the bottom of the lower shell 21 is provided with a socket 215 corresponding to the limit buckle 12; the limit buckle 12 is buckled into the socket 215 to limit the maximum range of axial movement of the mounting base 1 and the lower shell 21.

[0035] The mounting base 1 is circumferentially limited with the bottom of the lower shell 21 ; the inner wall of the mounting base 1 is provided with a guide rib 13 ; the outer wall of the lower shell 21 is provided with a guide groove 216 that cooperates with the guide rib 13 .

[0036] A detachable sleeve 225 cooperating with the gas stove switch shaft is coaxially arranged inside the connecting shaft sleeve 221, and a depth adjustment bolt 226 is arranged inside the detachable sleeve 225; an internal thread section threadably matched with the depth adjustment bolt 226 is arranged at the upper end of the detachable sleeve 225; the cross-section of the hole at the lower end of the detachable sleeve 225 matches the cross-section of the gas stove switch shaft; the minimum inner diameter of the internal thread section of the detachable sleeve 225 is greater than the maximum outer diameter of the gas stove switch shaft.

[0037] The cross-sectional profile of the outer wall of the removable sleeve 225 is in the shape of a gear with a central symmetry, and the cross-sectional profile of the sleeve hole of the connecting sleeve 221 matches it. Therefore, the removable sleeve 225 can be embedded in the sleeve hole of the connecting sleeve 221 at different installation angles. Since most of the gas stove switch shafts on the market have a "D"-shaped cross-section and different directions in the off-fire state, the removable sleeve 225 can be inserted into the gas stove switch shaft during installation to remove the directionality, so as to adjust the installation angle of the gas stove timer. After installation, the removable sleeve 225 is circumferentially limited in the connecting sleeve 221.

[0038] The maximum adjustable depth of the detachable sleeve 225 is greater than the length of the gas stove switch shaft.

[0039] The controller can be an embedded microcontroller, i.e., an MCU. The timer can be a mechanical timer in the prior art or an electronic timer module, or an MCU with an integrated timer peripheral can be used. In this case, the timer inside the MCU can be directly used, such as an STM32 series microcontroller. This embodiment uses a timer integrated inside the controller. The timing function of the present invention can use a prior art module. This embodiment does not limit the timing function of the present invention. The knob 22 is also provided with a display screen 227, a power supply 228, and a potentiometer electrically connected to the controller; the display screen 227 is used to display the time of the timer; the potentiometer input shaft is connected to the adjustment knob 229 for adjusting the timing time; the motor 212 is connected to the driving gear 213 through a gear reduction box. The side wall of the knob 22 is provided with a texture for increasing the friction of manual rotation. This embodiment is achieved by adding a cover shell with a pattern on the side wall, and its upper surface is provided with a protective cover plate of a transparent display screen 227 and an opening that cooperates with the adjustment knob 229. The electronic components in this embodiment are all arranged on a circuit board in the knob 22. Preferably, the circuit board is also provided with a buzzer and a motor terminal 2210. The wires of the motor 212 pass through the fan-shaped hollow 32 and are connected to the motor terminal 2210. In order to avoid the motor terminal 2210 blocking the rotation angle of the driven gear member 3, a notch for accommodating the motor terminal 2210 is provided on the top wall of the driven gear member 3 in this embodiment. The notch is connected to the fan-shaped hollow 32. Figure 9-10 shown.

[0040] The maximum amplitude of the axial movement of the lower shell 21 relative to the mounting base 1 is greater than the ignition pressing stroke of the gas stove switch shaft. The design of the detachable sleeve 225 can further expand the universality of the gas stove positioner. For different gas stove switch shafts, only detachable sleeves 225 accessories with different inner cavity shapes need to be equipped, without replacing the entire machine.

[0041] At the same time, after the limiting buckle 12 is buckled into the insertion hole 215, since the end of the limiting buckle 12 has a flange, it elastically deforms and inserts into the insertion hole 215. The axial movement stroke is the length from the bottom end of the limiting buckle 12 to the lower end of the flange. When the lower shell 21 moves upward relative to the mounting base 1 until the lower end surface of the flange buckles the upper end surface of the insertion hole 215, it reaches the highest point, thereby ensuring that the axial movement of the lower shell 21 will not separate from the mounting base 1.

[0042] The bottom of the mounting base 1 is fixed to the gas stove by double-sided adhesive.

[0043] The upper end of the depth adjustment bolt 226 is provided with a hexagonal adjustment hole, and the knob 22 is provided with an opening connected to the hexagonal adjustment hole. In this embodiment, the opening is arranged at the bottom of the installation box of the power supply 228, and the depth of the depth adjustment bolt 226 from the lower end opening of the detachable sleeve 225 is adjusted by a screwdriver. The specific adjustment hole structure and adjustment method of the depth adjustment bolt 226 do not limit the protection scope of the present invention. As long as the adjustment of the depth adjustment bolt 226 can be achieved by equivalent means, it is within the protection scope of the present invention.

[0044] Combination Figure 8-10 The installation and working principle of this embodiment are described as follows: first, the knob 22 of the gas stove timer is adjusted so that the angle position of the knob 22 relative to the lower shell 21 is the off position. In this embodiment, when the knob 22 is rotated until the micro switch is triggered by the protrusion 214; the angle position of the knob 22 relative to the lower shell 21 is the off position of the gas stove switch shaft.

[0045] Then, when the gas stove switch shaft is in the off state, first take out the detachable sleeve 225 and put it on the gas stove switch shaft, and then try to ensure that the display screen 227 is in a state of facing the user, and then insert the detachable sleeve 225 into the connecting shaft sleeve 221 of the gas stove timer; adjust the depth adjustment bolt 226 according to the length of the gas stove switch shaft, so that the bottom surface of the mounting base 1 can be glued and fixed to the gas stove table when the gas stove switch shaft is in the naturally extended state, and after the installation is completed, the lower shell 21 is in the following relative position relative to the mounting base 1 Figure 8 Specifically, the mounting base 1 and the gas stove tabletop can be fixed by using a double-sided adhesive that matches the shape of the bottom surface of the mounting base 1.

[0046] When the controller in the knob 22 detects that the micro switch is triggered by the protrusion 214, it controls the motor 212 to drive the driving gear 213 to rotate the driven gear member 3 counterclockwise (from a top view) until the protrusion 31 triggers the touch switch and stops rotating; at this time, the driven gear member 3 reaches a preset reset angle relative to the knob 22. At this time, the blocking column 224 contacts the edge of the top wall at one end of the fan-shaped hollow 32.

[0047] In order to help understand the driving principle of the present invention, the positions of the gear components and the sensor relative to the lower housing 21 after installation are shown in the figure. Fig.10 As shown in the figure (cross-sectional view from a top view), the positional relationship between the gear components and the sensor after installation according to the above steps is as follows: Fig.10 As shown, when the knob 22 is pressed and rotated counterclockwise, the lower shell 21 slides downward relative to the mounting base 1; the knob 22 presses down the gas stove switch shaft through the detachable sleeve 225 to ignite, while driving the micro switch, the touch switch and the blocking column 224 to rotate counterclockwise together; the micro switch moves away from the protrusion 214, and the end of the blocking column 224 rotates along the fan-shaped hollow 32 and approaches the top wall edge of the other end of the fan-shaped hollow 32. In this embodiment, the maximum angle of rotation of the blocking column 224 when it rotates from the top wall edge of one end of the fan-shaped hollow 32 to the top wall edge of the other end is 190°. The potentiometer is adjusted by the adjusting knob 229, and the controller sets the timing time of the timer according to the input of the potentiometer. After the timing time is reached, the controller controls the motor 212 to rotate the driving gear 213 clockwise, and the driving gear 213 drives the driven gear member 3 to rotate clockwise until the top wall contacts the blocking column 224. At this time, the top wall of the driven gear member 3 will drive the blocking column 224 to drive the knob 22 to rotate clockwise, when it turns to the micro switch being triggered by the protrusion 214; at this time, the gas stove switch shaft has turned off the gas, and then the motor 212 is controlled to drive the driving gear 213 to rotate the driven gear member 3 counterclockwise until the protrusion 31 triggers the touch switch and stops rotating; at this time, the driven gear member 3 reaches a preset reset angle relative to the knob 22, and the gas stove timer returns to its initial state.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0049] For those skilled in the art, various changes and modifications will undoubtedly be obvious after reading the above description. Therefore, the attached claims should be regarded as covering all changes and modifications of the true intent and scope of the present invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to still be within the intent and scope of the present invention.

Claims

1. A gas stove timer, characterized in that: The invention comprises a mounting base (1) and a movable body (2) which can move axially along the mounting base (1); the movable body (2) comprises a lower shell (21) and a knob (22) which are coaxially arranged; the knob (22) and the lower shell (21) are rotatably matched; the knob (22) is provided with a connecting sleeve (221) which is matched with the switch shaft of the gas stove; a driven gear member (3) is coaxially arranged inside the knob (22); the driven gear member (3) and the knob (22) are rotatably matched; A sleeve (211) rotatably matched with the connecting shaft sleeve (221) is provided in the lower shell (21); a motor (212) is provided in the lower shell (21); an output shaft of the motor (212) is connected to a driving gear (213); the driving gear (213) is meshed with the driven gear member (3); The knob (22) is provided with a controller, a timer, and a flame-off sensor (222); the timer, the flame-off sensor (222), and the motor (212) are all electrically connected to the controller.

2. The gas stove timer according to claim 1, characterized in that: The fire-off sensor (222) is a micro switch, and the sleeve (211) is provided with a protrusion (214) that cooperates with the micro switch; when the knob (22) is rotated until the micro switch is triggered by the protrusion (214), the angular position of the knob (22) relative to the lower shell (21) is the fire-off position of the gas stove switch shaft.

3. The gas stove timer according to claim 2, characterized in that: The knob (22) is also provided with a gear reset sensor (223) electrically connected to the controller; the gear reset sensor (223) is used to detect whether the driven gear member (3) has reached a preset reset angle relative to the knob (22).

4. The gas stove timer according to claim 3, characterized in that: The gear reset sensor (223) is a touch switch, and the driven gear member (3) is provided with a protrusion (31) that cooperates with the touch switch; when the driven gear member (3) rotates until the protrusion (31) triggers the touch switch, the driven gear member (3) reaches a preset reset angle relative to the knob (22).

5. The gas stove timer according to claim 4, characterized in that: The driven gear member (3) is axially limited between the lower shell (21) and the knob (22); the side wall of the driven gear member (3) is rotatably matched with the lower shell (21); the connecting shaft sleeve (221) is sleeved with the sleeve (211); the upper end of the connecting shaft sleeve (221) is fixedly connected to the knob (22), and the lower end of the connecting shaft sleeve (221) is provided with a flange for axially limiting the lower shell (21).

6. The gas stove timer according to claim 5, characterized in that: The driven gear member (3) comprises a gear ring and a top wall, the top wall being provided with a fan-shaped hollow (32) surrounding the connecting shaft sleeve (221); a blocking column (224) being provided on the knob (22); and an end of the blocking column (224) being located in the fan-shaped hollow (32).

7. The gas stove timer according to claim 4, characterized in that: The mounting base (1) cooperates with the bottom of the lower shell (21) for axial movement; the bottom of the lower shell (21) is coaxially sleeved with the mounting base (1); the bottom of the mounting base (1) is provided with an opening (11) for the gas stove switch shaft to pass through; the bottom of the mounting base (1) is provided with a plurality of limit buckles (12) around the opening (11); the bottom of the lower shell (21) is provided with a plug hole (215) corresponding to the limit buckle (12); the limit buckle (12) is buckled into the plug hole (215) to limit the maximum amplitude of the axial movement of the mounting base (1) and the lower shell (21); the mounting base (1) cooperates with the bottom of the lower shell (21) in circumferential limit direction; the inner wall of the mounting base (1) is provided with a guide rib (13); the outer wall of the lower shell (21) is provided with a guide groove (216) cooperating with the guide rib (13).

8. The gas stove timer according to claim 7, characterized in that: A detachable sleeve (225) coaxially arranged inside the connecting shaft sleeve (221) and cooperating with the gas stove switch shaft, wherein a depth adjustment bolt (226) is arranged inside the detachable sleeve (225); an internal thread section threadably cooperating with the depth adjustment bolt (226) is arranged at the upper end of the detachable sleeve (225); a cross section of an opening at the lower end of the detachable sleeve (225) matches a cross section of the gas stove switch shaft; and a minimum inner diameter of the internal thread section of the detachable sleeve (225) is greater than a maximum outer diameter of the gas stove switch shaft.

9. The gas stove timer according to claim 6, characterized in that: The knob (22) is also provided with a display screen (227) electrically connected to the controller, a power supply (228) and a potentiometer; the display screen (227) is used to display the time of the timer; the potentiometer input shaft is connected to the adjustment knob (229) for adjusting the timing time; the motor (212) is connected to the driving gear (213) via a gear reduction box.

10. A method for controlling a gas stove timer according to claim 9, characterized in that: The following steps are involved: 1) When the controller is powered on and reset, the control motor (212) drives the knob (22) and the driven gear member (3) to reset to an initial state, that is, the micro switch and the touch switch are both in a triggered state; 2) The controller detects the potentiometer input in real time, sets the timing time according to the potentiometer input and displays it on the display screen (227), then enters the countdown and turns off the display screen (227), and the controller detects the triggering state of the micro switch and the touch switch in real time. When it is detected that the micro switch and the touch switch are both in the triggering state, the timer time is cleared, indicating that the gas stove timer is manually restored to the initial state; otherwise, after the timing time is reached, the controller first starts the motor (212) to drive the driven gear member (3) to rotate until the micro switch is triggered by the protrusion (214); at this time, the gas stove switch shaft has turned off the gas, and then controls the motor (212) to reversely drive the driven gear member (3) to rotate until the protrusion (31) triggers the touch switch, and stops the motor (212), and the gas stove timer is restored to the initial state.

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