CN219976504U - Automatic fire closing device - Google Patents

Abstract

The utility model discloses an automatic fire closing device, which comprises a base and a fire striking rotary cover, wherein the fire striking rotary cover is movably arranged on the base, and a containing cavity is formed between the base and the fire striking rotary cover; an upper circuit board, a sparking assembly, a lower circuit board, a motor group, a motor seat and a sparking rod are sequentially arranged in the accommodating cavity from top to bottom; the whole fire closing device can realize that the fire striking rotary cover, the fire striking transmission piece, the fire striking rod sleeve and the fire striking rod can synchronously rotate together through improvement; the base, the motor base, the lower circuit board and the upper circuit board can be kept motionless when the ignition rotary cover, the ignition transmission piece, the ignition rod sleeve and the ignition rod rotate, and the ignition rotary cover, the ignition transmission piece, the timing rotary cover, the upper circuit board, the lower circuit board and the motor base can move up and down along the axial direction together, so that in the using process of the gas stove fire arrester, no matter when the ignition and the automatic fire-off are carried out, the man-machine interface and the ignition knob do not rotate together, and the human engineering is met.

Description

Automatic fire closing device

Technical Field

The utility model relates to the field of fire closing devices of gas cookers, in particular to an automatic fire closing device.

Background

The gas stove is used as a common cooker, is closely related to our life, and can be used for cooking by boiling water, and is not separated from the gas stove. Because the knob switch of the gas stove is mainly manually operated, people often encounter the situation that the people are busy or leave the cooking site with urgent matters in the kitchen cooking process, and at the moment, the gas stove is forgotten to be closed, so that potential safety hazards such as overburn, fire disaster and the like exist; the main method is to develop corresponding software programs by utilizing control devices such as a singlechip, a PLC and the like and combining technologies such as a pressure sensor, temperature detection, a thermocouple, an electromagnetic valve and the like to reform the gas stove, so that the gas stove can realize multiple functions such as automatic ignition, timing fire closing, firepower adjustment, dry burning prevention, idle burning prevention and the like;

however, the problem is neglected, namely, in the use process of the gas stove fire-closing device, when the fire is ignited and closed, the human-computer interface (display screen) can rotate along with the ignition knob, so that inconvenience is brought to people in the use process, and the human engineering is not met.

Disclosure of Invention

The utility model provides an automatic fire closing device for solving the problems in the prior art, which ensures that a human-computer interface and a knob do not rotate together when a fire is ignited and closed, and accords with human engineering.

The utility model relates to an automatic fire closing device, which comprises a base and a fire striking rotary cover, wherein the fire striking rotary cover is movably arranged on the base, and a containing cavity is formed between the base and the fire striking rotary cover; an upper circuit board, a sparking assembly, a lower circuit board, a motor group, a motor seat and a sparking rod are arranged in the accommodating cavity from top to bottom;

the upper circuit board is placed on the ignition assembly and is fixedly connected with the lower circuit board below the ignition assembly, and the upper circuit board and the ignition assembly are not fixedly connected and can move relatively;

the motor group is connected to the lower circuit board and is arranged in the motor base;

the ignition assembly penetrates through the lower circuit board and is connected with the motor group; the ignition component passes through the motor seat and is fixedly connected with the ignition rod;

the base, the motor base, the lower circuit board and the upper circuit board are kept still when the sparking rotary cover, the sparking transmission piece, the sparking rod sleeve and the sparking rod rotate.

Further improved, the ignition assembly comprises an ignition transmission piece, an ignition transmission wheel and an ignition rod sleeve; the outer wall of the sparking transmission piece is adhered with the inner wall of the sparking rotary cover; the sparking transmission piece comprises a circular ring, a supporting cantilever is arranged on the inner wall of the circular ring in a horizontal direction and extends towards the center of the circular ring, and a rotating shaft is arranged at the position, which is downward and is positioned at the right center of the circular ring, of the extending end of the supporting cantilever; the rotary shaft is sleeved with a sparking driving wheel, and the lower port of the rotary shaft is connected with a sparking rod sleeve.

Further improvement, a contact pin movement space is formed between the circular ring and the supporting cantilever; a limiting block is arranged on the upper end surface of the supporting cantilever, and a sparking driving wheel deflector rod is arranged on one side of the upper end of the rotating shaft; the inner hole of the rotating shaft is regular octagon, and the lower end of the rotating shaft is sleeved with a buckle which can pass through the central hole of the motor base and support the motor base; the upper end of the rotating shaft is provided with a transmission gear.

Further improved, the ignition driving wheel passes through the lower layer circuit board, is arranged in the motor base and is connected with the motor group.

Further improved, the sparking rod sleeve sequentially penetrates through the lower circuit board, the motor base and the sparking rod to be fixedly connected, so that the sparking rotary cover, the sparking transmission piece, the sparking rod sleeve and the sparking rod can synchronously rotate together.

Further improved, the upper circuit board is placed on the ignition transmission part, and the upper circuit board and the ignition transmission part are not fixedly connected and can move relatively; the upper plane of the upper circuit board is connected with a display screen, and the lower plane is connected with a fire-related limit switch, a singlechip and a contact pin.

Further improved, the surface of the outer ring of the sparking driving wheel is gear-shaped and is connected with a limiting boss, the middle of the sparking driving wheel is round hole-shaped, and round protrusions are arranged in the round holes.

Further improvement, the upper plane of the lower circuit board is fixedly connected with a sparking information encoder, a buzzer, a zero return limit switch and a pin holder, the lower plane is fixedly connected with a battery holder and a timer encoder, a round hole is formed in the middle of the lower plane, and a motor hole communicated with the round hole is formed in one side of the round hole; an output shaft of the ignition information encoder is connected with an ignition information gear; the output shaft of the timer encoder is provided with a timer gear; the ignition information gear is meshed with the transmission gear, a certain number of limit switches can be added on the lower plane of the upper circuit board, and a reasonable boss is arranged on the ignition transmission piece.

Further improved, the contact pin passes through the ignition transmission piece and is fixedly connected with the contact pin seat at the corresponding position, so that the upper circuit board and the lower circuit board are fixedly connected, and the ignition transmission piece can rotate between the upper circuit board and the lower circuit board.

Further improved, the motor group comprises a motor, an output shaft of the motor is connected with a speed reducer, and an output shaft of the speed reducer is connected with a cylindrical gear which is meshed with the ignition driving wheel.

Further improvement, one side of the motor base is provided with a motor fixing hole, and a motor unit is placed in the motor fixing hole; a limiting hole column is arranged at the lower end of the left side close to the motor fixing hole, and a limiting circular concave hole is arranged on the upper end surface of the right side; a limit column is arranged at the bottom of the base; the limiting hole column is inserted into the limiting column.

Further improved, the ignition rotary cover, the ignition transmission piece, the timing rotary cover, the upper circuit board, the lower circuit board and the motor base can move up and down along the axial direction.

Further improvement, one side of the motor base is provided with a motor fixing hole, and a motor unit is placed in the motor fixing hole; a limiting hole column is arranged at the lower end of the left side close to the motor fixing hole, and a limiting round hollow hole column is arranged on the upper end face of the right side.

Further improved, the bottom of the base is provided with a limit column matched with the limit hole column.

Further improvement, a timing rotating cover is arranged between the base and the sparking rotating cover, the timing rotating cover is movably arranged on the base, and the sparking rotating cover is movably arranged on the timing rotating cover; the inner wall of the timing rotary cover is provided with a timer inner gear which is meshed with the timer gear.

Further improved, the upper end of the sparking rotary cover is provided with a face sticker or a transparent cover.

Further improved, the inner circular surface of the sparking rotary cover and the outer circular surface of the timing rotary cover are provided with gaps.

Compared with the prior art, the utility model has the beneficial effects that:

the whole fire closing device is improved, so that the base, the motor base, the lower circuit board and the upper circuit board are kept motionless when the fire striking rotary cover, the fire striking transmission piece, the fire striking rod sleeve and the fire striking rod synchronously rotate together, and therefore, no matter when the fire striking rotary cover is used for striking and automatically closing the fire, a human-computer interface (display screen) and the fire striking rotary cover do not rotate together in the using process of the fire closing device of the gas stove, the human engineering is met, and the requirements of people for high-quality life are met.

Drawings

FIG. 1 is an exploded view of the product of example 1 of the present utility model;

FIG. 2 is a front cross-sectional view of example 1 of the present utility model;

FIG. 3 is a top half cross-sectional view of example 1 of the present utility model;

fig. 4 is a schematic structural diagram of an upper circuit board.

FIG. 5 is a schematic view of the structure of the spark driving member;

FIG. 6 is a schematic view of the structure of the sparking drive wheel;

fig. 7 is a schematic structural diagram of a lower circuit board;

FIG. 8 is a schematic diagram of a motor unit;

FIG. 9 is a schematic diagram of a motor mount;

FIG. 10 is a schematic view of the structure of the base;

FIG. 11 is an exploded view of the product of example 2 of the present utility model;

FIG. 12 is a front cross-sectional view of the product of example 2 of the present utility model;

FIG. 13 is a schematic view of the structure of the timing rotary cover;

fig. 14 is another schematic structure of the lower circuit board.

Detailed Description

The utility model is further described below with reference to the drawings and the detailed description.

Examples

As shown in fig. 4, the upper plane of the upper circuit board 3 is connected with a display screen 3.1, and the lower plane is connected with a fire-related limit switch 3.2, a singlechip 3.3 and a contact pin 3.4;

as shown in fig. 5, the sparking driving member 4 comprises a circular ring 4.4, wherein a supporting cantilever 4.7 is arranged on the inner wall of the circular ring 4.4 and extends towards the center of the circular ring along the horizontal direction, and a rotating shaft 4.6 is arranged at the position, which is downward and is positioned at the right center of the circular ring 4.4, of the extending end of the supporting cantilever; a pin movement space 4.2 is formed between the circular ring 4.4 and the supporting cantilever 4.7, so that the pin can pass through the area and can complete the ignition rotation movement in the area without interfering with other parts; a limiting block 4.1 is arranged on the upper end surface of the supporting cantilever 4.7, and a sparking driving wheel deflector 4.5 is arranged on one side of the upper end of the rotating shaft 4.6; the inner hole of the rotating shaft 4.6 is regular octagon, and the lower end of the rotating shaft 4.6 is sleeved with a buckle 4.3; the upper end of the rotating shaft 4.6 is provided with a transmission gear 4.8;

what needs to be explained here is: the ring, the supporting cantilever, the rotating shaft, the ignition driving wheel deflector rod and the driving gear are integrally injection molded, and can be realized by bonding, metal processing and other modes, and the injection molding is determined according to actual needs;

as shown in fig. 6, the outer ring surface of the sparking driving wheel 5 is gear-shaped and is connected with a limiting boss 5.1, the middle is round hole-shaped and round protrusions 5.2 are arranged in the round holes;

as shown in fig. 7, the upper plane of the lower circuit board 7 is fixedly connected with a sparking information encoder 7.5, a buzzer 7.6, a return-to-zero limit switch 7.2 and a pin seat 7.1, the lower plane is fixedly connected with a battery seat 7.3, a round hole is formed in the middle of the lower plane, and a motor hole communicated with the round hole is formed in one side of the round hole; an output shaft of the ignition information encoder 7.5 is connected with an ignition information gear 7.4;

as shown in fig. 8, the motor group comprises a motor 8.1, an output shaft of the motor is connected with a speed reducer 8.3, and an output shaft of the speed reducer 8.3 is connected with a cylindrical gear 8.2 which is used for being meshed with the ignition driving wheel 5;

as shown in fig. 9, a motor fixing hole 9.1 is arranged on one side of the motor base 9, and a motor unit 8 is placed in the motor fixing hole; a limiting hole column 9.3 is arranged at the lower end of the left side close to the motor fixing hole 9.1, and a limiting circular concave hole 9.2 is arranged on the upper end surface of the right side;

as shown in fig. 10, a limit post 10.1 is arranged at the bottom of the base 10;

1-3 and 4-10, an automatic fire closing device comprises a base 10 and a fire striking rotary cover 2, wherein the fire striking rotary cover 2 is movably attached to the base 10, and a containing cavity is formed between the base and the fire striking rotary cover;

an upper layer circuit board 3, a sparking transmission piece 4, a sparking transmission wheel 5, a sparking rod sleeve 6, a lower layer circuit board 7, a motor group 8, a motor seat 9 and a sparking rod 12 are sequentially arranged in the accommodating cavity from top to bottom;

the upper circuit board 3 is placed on the ignition transmission part 4, and the upper circuit board and the ignition transmission part are not fixedly connected and can move relatively; the outer wall of the sparking transmission piece 4 is adhered with the inner wall of the sparking rotary cover 2, so that the sparking transmission function is realized when the sparking rotary cover is rotated to drive the sparking transmission piece, the contact area of the sparking rotary cover is large, and labor is saved during sparking;

the rotary shaft 4.6 is sleeved with a sparking driving wheel 5, and the lower port of the rotary shaft 4.6 is connected with a sparking rod sleeve 6;

the motor unit 8 is connected to the lower circuit board 7 and is arranged in the motor base 9, and a limit hole column 9.3 of the motor base 9 is fixed on a limit column 10.1 of the base 10;

the contact pin 3.4 passes through the ignition transmission piece 4 and is fixedly connected with the corresponding position of the contact pin seat 7.1, so that the fixed connection between the upper circuit board 3 and the lower circuit board 7 is realized, and the ignition transmission piece can rotate between the upper circuit board and the lower circuit board;

the ignition driving wheel 5 passes through the lower circuit board 7 and is placed in a limit circular concave hole 9.2 of the motor seat 9 and meshed with a cylindrical gear 8.2 of the motor unit, so that the motor drives the ignition driving wheel to rotate;

the sparking rod sleeve sequentially penetrates through the central round hole of the lower circuit board 7 and the limit round hollow column 9.2 of the motor seat 9 to be fixedly connected with the sparking rod 12, so that the sparking rotary cover 2, the sparking transmission piece 4, the sparking rod sleeve 6 and the sparking rod 12 can synchronously rotate together;

because of the butt joint of the contact pin 3.4 and the contact pin seat 7.1 and the butt joint of the limit hole column 9.3 and the limit column 10.1, the base 10, the motor seat 9, the lower circuit board 7 and the upper circuit board 3 are kept still when the ignition rotary cover 2, the ignition transmission piece 4, the ignition rod sleeve 6 and the ignition rod 12 rotate, and the ignition rotary cover, the ignition transmission piece, the timing rotary cover, the upper circuit board, the lower circuit board and the motor seat can move up and down along the axial direction together.

The ignition information gear 7.4 is meshed with the transmission gear 4.8, and can sense the information of a fire switch and the size when the fire is currently ignited.

The cylindrical gear 8.2 of the motor unit is meshed with the gear on the outer ring surface of the ignition driving wheel 5, the circular protrusion 5.2 at the bottom of the ignition driving wheel 5 is placed in the limiting circular concave hole 9.2 of the motor base 9, limiting and rotation around the axis of the ignition driving wheel 5 are achieved, the ignition driving wheel 5 is driven to reversely rotate through the cylindrical gear 8.2, and accordingly the driving gear 4.8, the rotating shaft 4.6 and the ignition rod 12 are driven to reversely rotate, and accordingly an automatic ignition closing function is achieved.

The buckle 4.3 at the lower end of the ignition driving medium 4 passes through the central round hole of the motor seat 9 and supports the motor seat 9.

When the round bulge 5.2 moves, the striking transmission wheel deflector rod 4.5 has corresponding movement space, so that the movement space required by the rotation of the striking transmission piece deflector rod 4.5 without interference with other pieces during manual striking is met, and the bulge part on the side surface of the movement space can stir the striking transmission piece deflector rod 4.5; the limiting block 4.1 can be contacted with a fire closing limiting switch 3.2 on the upper circuit board 3.

The zeroing state is realized by the motion contact of the limit boss 5.1 of the ignition driving wheel 5 and the zeroing limit switch 7.2 of the lower circuit board 7.

The display screen 3.1 is a touch screen, and a surface patch is generally adopted, can be stuck together with the sparking rotary cover 2 and rotates together with the sparking rotary cover 2 or is stuck together with the touch screen and does not rotate together with the sparking rotary cover; the display content of the touch screen is rich in color, the information of the fire, the firing time, the timing closing time and the like can be observed, and the timing function is realized through the touch screen.

Also to be described at this time is: the contact pin 3.4 is connected with the contact pin seat 7.1, or can be connected by a flat cable and a flexible wire and is fixed by being matched with a copper column; the outer plane of the sparking rotary cover 2 can be multi-deformed or provided with knurling, small bumps and the like, so that the friction force is increased; the gear 7.4 of the planar ignition information encoder 7.5 on the lower circuit board 7 is meshed with the gear of the ignition driving part 4, a certain number of limit switches can be added on the lower plane of the upper circuit board 3, and a reasonable boss is arranged on the ignition driving part 4.

After the whole fire closing device is improved, the fire striking rotary cover 2, the fire striking transmission piece 4, the fire striking rod sleeve 6 and the fire striking rod 12 can synchronously rotate; the base 10, the motor base 9, the lower circuit board 7 and the upper circuit board 3 can be kept motionless when the ignition rotary cover 2, the ignition transmission piece 4, the ignition rod sleeve 6 and the ignition rod 12 rotate, and the ignition rotary cover, the ignition transmission piece, the upper circuit board, the lower circuit board and the motor base can move up and down along the axial direction together, so that a man-machine interface (display screen) and an ignition knob do not rotate together in the using process of the gas stove fire closer no matter when the ignition and the automatic fire closing are carried out, the human engineering is met, and the requirements of people for high-quality life are met.

Examples

As shown in fig. 11 to 13, the difference from embodiment 1 is that: a timing rotating cover 11 is arranged between the base 10 and the sparking rotating cover 2, a step 11.1 is arranged at the upper end of the timing rotating cover 11 and is arranged on the upper plane of the lower circuit board 7; the sparking rotary cover 2 is movably arranged on the timing rotary cover;

in order to match the timing rotary cover 11 to realize the timing function, as shown in fig. 14, the lower plane of the lower layer circuit board 7 is fixedly connected with a timer encoder 7.7, an output shaft of the timer encoder 7.7 is provided with a timer gear 7.8, the inner wall of the timing rotary cover 11 is provided with a timer inner gear 11.2, and the timer inner gear 11.2 is meshed with the timer gear 7.8, thereby realizing the timing function.

The display screen 3.1 can be a liquid crystal screen, a touch screen and the like, if the liquid crystal screen is selected, a space is reserved between the liquid crystal screen and the transparent cover 1, the transparent cover 1 is fixed on the sparking rotary cover 2 and moves rotationally together with the sparking rotary cover 2 or the transparent cover 1 is directly connected and fixed with the liquid crystal screen and does not move rotationally together with the sparking rotary cover 2; if a touch screen is selected, a surface patch is generally adopted, and the surface patch can be stuck together with the sparking rotary cover 2 and rotate together with the sparking rotary cover 2 or be stuck together with the touch screen and not rotate together with the sparking rotary cover.

The present utility model has been described in terms of the preferred embodiments thereof, and it should be understood by those skilled in the art that various modifications can be made without departing from the principles of the utility model, and such modifications should also be considered as being within the scope of the utility model.

Claims (13)

1. An automatic fire closing device comprises a base (10) and a fire striking rotary cover (2), wherein the fire striking rotary cover (2) is movably arranged on the base (10) and forms a containing cavity between the base and the base; the method is characterized in that: an upper circuit board (3), a sparking assembly, a lower circuit board (7), a motor group (8), a motor seat (9) and a sparking rod (12) are arranged in the accommodating cavity from top to bottom;

the upper circuit board (3) is arranged on the ignition assembly and is fixedly connected with the lower circuit board (7) positioned below the ignition assembly, and the upper circuit board (3) and the ignition assembly are not fixedly connected and can move relatively;

the motor group (8) is connected to the lower circuit board (7) and is arranged in the motor base (9);

the ignition component passes through the lower circuit board (7) and is connected with the motor group (8); the ignition component passes through the motor seat (9) and is fixedly connected with the ignition rod (12);

the base (10), the motor base (9), the lower circuit board (7) and the upper circuit board (3) are kept motionless when the sparking rotary cover (2), the sparking transmission piece (4), the sparking rod sleeve (6) and the sparking rod (12) rotate.

2. An automatic fire shut-off device according to claim 1, wherein: the sparking assembly comprises a sparking transmission piece (4), a sparking transmission wheel (5) and a sparking rod sleeve (6); the outer wall of the sparking transmission piece (4) is adhered with the inner wall of the sparking rotary cover (2); the sparking transmission piece (4) comprises a circular ring (4.4), a supporting cantilever (4.7) is arranged on the inner wall of the circular ring (4.4) in a horizontal direction towards the center of the circular ring in an extending mode, and a rotating shaft (4.6) is arranged at the position, located at the right center of the circular ring (4.4), of the extending end of the supporting cantilever downwards; the rotary shaft (4.6) is sleeved with a sparking driving wheel (5), and the lower port of the rotary shaft (4.6) is connected with a sparking rod sleeve (6).

3. An automatic fire shut-off device according to claim 2, wherein: a pin movement space (4.2) is formed between the circular ring (4.4) and the supporting cantilever (4.7); a limiting block (4.1) is arranged on the upper end surface of the supporting cantilever (4.7), and a sparking driving wheel deflector rod (4.5) is arranged on one side of the upper end of the rotating shaft (4.6); the inner hole of the rotating shaft (4.6) is regular octagon, and a buckle (4.3) which can pass through the central hole of the motor base (9) and support the motor base (9) is sleeved on the lower end of the rotating shaft (4.6); the upper end of the rotating shaft (4.6) is provided with a transmission gear (4.8).

4. An automatic fire shut-off device according to claim 3, wherein: the sparking driving wheel (5) passes through the lower layer circuit board (7) to be placed in the motor base (9) and is connected with the motor unit (8).

5. An automatic fire shut-off device according to claim 4, wherein: the sparking rod sleeve (6) sequentially penetrates through the lower-layer circuit board (7), the motor base (9) and the sparking rod (12) to be fixedly connected, so that the sparking rotary cover (2), the sparking transmission piece (4), the sparking rod sleeve (6) and the sparking rod (12) can synchronously rotate together.

6. An automatic fire shut-off device according to claim 5, wherein: the upper circuit board (3) is placed on the ignition transmission piece (4) and is not fixedly connected with the ignition transmission piece and can move relatively; the upper plane of the upper circuit board (3) is connected with a display screen (3.1), and the lower plane is connected with a fire-related limit switch (3.2), a singlechip (3.3) and a contact pin (3.4).

7. An automatic fire shut down device according to claim 6, wherein: the surface of the outer ring of the sparking driving wheel (5) is gear-shaped and is connected with a limiting boss (5.1), the middle of the sparking driving wheel is round hole-shaped, and round protrusions (5.2) are arranged in the round holes.

8. An automatic fire shut down device as defined in claim 7 wherein: the upper plane of the lower circuit board (7) is fixedly connected with a sparking information encoder (7.5), a buzzer (7.6), a return-to-zero limit switch (7.2) and a pin seat (7.1), the lower plane is fixedly connected with a battery seat (7.3) and a timer encoder (7.7), a round hole is formed in the middle of the lower plane, and a motor hole communicated with the round hole is formed in one side of the round hole; an output shaft of the ignition information encoder (7.5) is connected with an ignition information gear (7.4); the output shaft of the timer encoder (7.7) is provided with a timer gear (7.8); the ignition information gear (7.4) is meshed with the transmission gear (4.8).

9. An automatic fire shut down device according to claim 8, wherein: the contact pin (3.4) passes through the ignition transmission piece (4) and is fixedly connected with the corresponding position of the contact pin seat (7.1), so that the upper circuit board and the lower circuit board are fixedly connected, and the ignition transmission piece (4) can rotate between the upper circuit board and the lower circuit board.

10. An automatic fire shut down device as defined in claim 9 wherein: the motor group (8) comprises a motor (8.1), an output shaft of the motor is connected with a speed reducer (8.3), and an output shaft of the speed reducer (8.3) is connected with a cylindrical gear (8.2) which is meshed with the ignition driving wheel (5).

11. An automatic fire shut down device as defined in claim 10 wherein: one side of the motor base (9) is provided with a motor fixing hole (9.1), and a motor unit (8) is placed in the motor fixing hole; a limiting hole column (9.3) is arranged at the lower end of the left side close to the motor fixing hole (9.1), and a limiting circular concave hole (9.2) is arranged on the upper end surface of the right side; a limit column (10.1) is arranged at the bottom of the base (10); the limiting hole column (9.3) is inserted into the limiting column (10.1).

12. An automatic fire shut down device as defined in claim 11 wherein: the sparking rotary cover (2), the sparking transmission piece (4), the upper circuit board (3), the lower circuit board (7) and the motor base (9) can move up and down along the axial direction.

13. An automatic fire shut down device as defined in claim 12 wherein: a timing rotating cover (11) is further arranged between the base (10) and the sparking rotating cover (2), the timing rotating cover (11) is movably connected to the base (10), and the sparking rotating cover (2) is movably connected to the timing rotating cover (11); the inner wall of the timing rotary cover (11) is provided with a timer inner gear (11.2), and the timer inner gear (11.2) is meshed with the timer gear (7.8).