阅读说明：本技术 一种强制安全式煤气总开关定时闭停控制装置 (Forced safety type timing closing and stopping control device for gas main switch ) 是由 王鹏 闫周 王扬 薛冲 徐誉浩 孙权驰 张凤宇 王悠然 张硕 肖清浩 张树正 于 2021-02-02 设计创作，主要内容包括：一种强制安全式煤气总开关定时闭停控制装置,包括箱体、煤气总开关启闭控制组件、煤气总开关闭停触发组件以及煤气总开关开启时长计时组件；箱体固定在墙体上,煤气管道及煤气总开关位于箱体与墙体之间,煤气总开关启闭控制组件、煤气总开关闭停触发组件以及煤气总开关开启时长计时组件均安装在箱体上；煤气总开关启闭控制组件与煤气总开关配合使用；煤气总开关闭停触发组件位于煤气总开关启闭控制组件与煤气总开关开启时长计时组件之间。本装置能够对煤气总开关的开启时长进行设定,计时结束后可第一时间自主关闭煤气总开关,且装置计时功能优先级高于煤气总开关开启优先级,否则在计时开始前,煤气总开关无法完成开启,从而实现强制安全。(A forced safety type timing closing and stopping control device for a gas main switch comprises a box body, a gas main switch opening and closing control assembly, a gas main switch closing and stopping trigger assembly and a gas main switch opening time timing assembly; the gas main switch on-off control assembly, the gas main switch on-off triggering assembly and the gas main switch on-time timing assembly are all arranged on the box body; the gas main switch on-off control component is matched with the gas main switch for use; the gas main switch on-off stopping triggering component is positioned between the gas main switch on-off control component and the gas main switch on-time timing component. The device can set the starting time of the gas main switch, the gas main switch can be automatically turned off at the first time after the timing is finished, the priority of the timing function of the device is higher than the starting priority of the gas main switch, otherwise, the gas main switch cannot be turned on before the timing is started, and therefore forced safety is achieved.)

1. A forced safety type gas main switch timing closing and stopping control device is characterized in that: the gas main switch on-off control device comprises a box body, a gas main switch on-off control component, a gas main switch on-off trigger component and a gas main switch on-time timing component; the gas pipeline is positioned between the rear side wall plate of the box body and the wall body, and the gas main switch is positioned on the gas pipeline between the rear side wall plate of the box body and the wall body; the gas main switch on-off control assembly, the gas main switch on-off trigger assembly and the gas main switch on-time timing assembly are all arranged on the box body; the gas main switch on-off control component is matched with the gas main switch for use; the gas main switch on-off stopping triggering component is positioned between the gas main switch on-off control component and the gas main switch on-time timing component.

2. The forced safety type gas main switch timing closing and stopping control device as claimed in claim 1, characterized in that: the gas main switch opening and closing control assembly comprises a gas main switch opening and closing control knob, a first rotating shaft, a first coil spring and a gas main switch switching clamping jaw; two ends of the first rotating shaft are respectively and rotatably connected to the front side wall plate and the rear side wall plate of the box body through shaft sleeves, the front end of the first rotating shaft extends out of the front side wall plate of the box body, and the gas main switch opening and closing control knob is fixedly arranged at the front end of the first rotating shaft; the rear end of the first rotating shaft extends out of a rear side wall plate of the box body, the gas main switch switching clamping jaw is fixedly installed at the rear end of the first rotating shaft, and the gas main switch switching clamping jaw is fixedly clamped and connected with the gas main switch; the first coil spring is sleeved on the first rotating shaft, the inner end of the first coil spring is fixedly connected with the first rotating shaft, and the outer end of the first coil spring is fixedly connected with the box body; a gas switch marking plate is arranged between the gas main switch opening and closing control knob and the front side wall plate of the box body, the gas switch marking plate is fixedly arranged on the front side wall plate of the box body, and a mark for indicating the gas opening and a mark for indicating the gas closing are arranged on the front surface of the gas switch marking plate.

3. The forced safety type gas main switch timing closing and stopping control device as claimed in claim 2, characterized in that: the coal gas main switch starting time duration timing assembly comprises a coal gas main switch starting time duration timing knob, a second rotating shaft, a third rotating shaft, a fourth rotating shaft, a fifth rotating shaft, a sixth rotating shaft, a second coil spring, a first large gear, a first small gear, a second large gear, a second small gear, a third large gear, a third small gear, an escape wheel, a balance wheel, a swing rod and a hairspring; two ends of the second rotating shaft, the third rotating shaft, the fourth rotating shaft, the fifth rotating shaft and the sixth rotating shaft are respectively and rotatably connected to the front side wall plate and the rear side wall plate of the box body through shaft sleeves, and the first rotating shaft, the second rotating shaft, the third rotating shaft, the fourth rotating shaft, the fifth rotating shaft and the sixth rotating shaft are mutually arranged in parallel; the front end of the second rotating shaft extends out of a front side wall plate of the box body, and the starting time period timing knob of the gas main switch is fixedly arranged at the front end of the second rotating shaft; the second coil spring is sleeved on the second rotating shaft, the inner end of the second coil spring is fixedly connected with the second rotating shaft, and the outer end of the second coil spring is fixedly connected with the box body; a gas starting timing mark plate is arranged between the gas main switch starting time length timing knob and the front side wall plate of the box body, the gas starting timing mark plate is fixedly arranged on the front side wall plate of the box body, and the front surface of the gas starting timing mark plate is provided with identification scales for representing gas starting time; the first gearwheel is fixedly sleeved on the second rotating shaft; the first pinion and the second gearwheel are coaxially and fixedly sleeved on the third rotating shaft, and the first pinion is meshed with the first gearwheel; the second pinion and the third gearwheel are coaxially and fixedly sleeved on the fourth rotating shaft, and the second pinion is meshed with the second gearwheel; the third pinion and the escape wheel are coaxially and fixedly sleeved on the fifth rotating shaft, and the third pinion is meshed with the third bull gear; the balance wheel is fixedly sleeved on the sixth rotating shaft, the oscillating bar is fixedly connected to the balance wheel, the oscillating bar is parallel to the sixth rotating shaft, and the escape wheel is meshed with the oscillating bar; the hairspring is sleeved on the sixth rotating shaft, the inner end of the hairspring is fixedly connected to the sixth rotating shaft, and the outer end of the hairspring is fixedly connected with the box body.

4. The forced safety type gas main switch timing closing and stopping control device as claimed in claim 3, characterized in that: the coal gas main on-off stopping triggering assembly comprises a ratchet wheel, a pawl supporting frame and a cam; the ratchet wheel is fixedly sleeved on the first rotating shaft; the pawl support frame is vertically and fixedly arranged on a bottom plate of the box body, the pawl is arranged at the top of the pawl support frame, and the tip end of the pawl is meshed with the ratchet of the ratchet wheel; the cam is fixedly sleeved on the second rotating shaft, and the cam is matched with the root end of the pawl in a pushing mode.

Technical Field

The invention belongs to the technical field of gas safety equipment, and particularly relates to a forced safety type gas main switch timing on-off control device.

Background

In the process of daily using gas, people can encounter two switches, one is a main gas switch on a gas pipeline, and the other is a main gas switch on a gas stove, and people often only close the main gas switch on the gas pipeline after using the gas stove, forget or completely neglect to close the main gas switch on the gas pipeline, so that the wrong use habit is also the main reason for gas leakage accidents.

It can be found from the gas leakage accidents that have occurred in the past that gas leakage points are basically a gas stove and a hose connecting the gas stove and a gas pipeline, and the reasons for gas leakage are that the pipeline is aged and careless, but the gas leakage accidents have a common characteristic that a gas main switch is in an open state. Therefore, a habit of closing the gas main switch in time is developed, which is very important for reducing the incidence rate of gas leakage accidents.

However, good gas usage habits are not always developed, and it is obviously unreliable to rely on good habits and consciousness of people. Therefore, it is necessary to design a device which can be free from the influence of human factors and can automatically and forcibly close the gas main switch within a set time.

Disclosure of Invention

Aiming at the problems existing in the prior stage, the invention provides a forced safety type timing closing and stopping control device for a gas main switch, which can set the opening time of the gas main switch, and can automatically complete the closing of the gas main switch at the first time after the timing is finished, particularly, the priority of the timing function of the device is higher than the opening priority of the gas main switch, namely, the gas main switch can be opened only after the opening time of the gas main switch is set, otherwise, the gas main switch can not be opened before the timing is started, thereby realizing the forced safety.

In order to achieve the purpose, the invention adopts the following technical scheme: a forced safety type timing closing and stopping control device for a gas main switch comprises a box body, a gas main switch opening and closing control assembly, a gas main switch closing and stopping trigger assembly and a gas main switch opening time timing assembly; the gas pipeline is positioned between the rear side wall plate of the box body and the wall body, and the gas main switch is positioned on the gas pipeline between the rear side wall plate of the box body and the wall body; the gas main switch on-off control assembly, the gas main switch on-off trigger assembly and the gas main switch on-time timing assembly are all arranged on the box body; the gas main switch on-off control component is matched with the gas main switch for use; the gas main switch on-off stopping triggering component is positioned between the gas main switch on-off control component and the gas main switch on-time timing component.

The gas main switch opening and closing control assembly comprises a gas main switch opening and closing control knob, a first rotating shaft, a first coil spring and a gas main switch switching clamping jaw; two ends of the first rotating shaft are respectively and rotatably connected to the front side wall plate and the rear side wall plate of the box body through shaft sleeves, the front end of the first rotating shaft extends out of the front side wall plate of the box body, and the gas main switch opening and closing control knob is fixedly arranged at the front end of the first rotating shaft; the rear end of the first rotating shaft extends out of a rear side wall plate of the box body, the gas main switch switching clamping jaw is fixedly installed at the rear end of the first rotating shaft, and the gas main switch switching clamping jaw is fixedly clamped and connected with the gas main switch; the first coil spring is sleeved on the first rotating shaft, the inner end of the first coil spring is fixedly connected with the first rotating shaft, and the outer end of the first coil spring is fixedly connected with the box body; a gas switch marking plate is arranged between the gas main switch opening and closing control knob and the front side wall plate of the box body, the gas switch marking plate is fixedly arranged on the front side wall plate of the box body, and a mark for indicating the gas opening and a mark for indicating the gas closing are arranged on the front surface of the gas switch marking plate.

The coal gas main switch starting time duration timing assembly comprises a coal gas main switch starting time duration timing knob, a second rotating shaft, a third rotating shaft, a fourth rotating shaft, a fifth rotating shaft, a sixth rotating shaft, a second coil spring, a first large gear, a first small gear, a second large gear, a second small gear, a third large gear, a third small gear, an escape wheel, a balance wheel, a swing rod and a hairspring; two ends of the second rotating shaft, the third rotating shaft, the fourth rotating shaft, the fifth rotating shaft and the sixth rotating shaft are respectively and rotatably connected to the front side wall plate and the rear side wall plate of the box body through shaft sleeves, and the first rotating shaft, the second rotating shaft, the third rotating shaft, the fourth rotating shaft, the fifth rotating shaft and the sixth rotating shaft are mutually arranged in parallel; the front end of the second rotating shaft extends out of a front side wall plate of the box body, and the starting time period timing knob of the gas main switch is fixedly arranged at the front end of the second rotating shaft; the second coil spring is sleeved on the second rotating shaft, the inner end of the second coil spring is fixedly connected with the second rotating shaft, and the outer end of the second coil spring is fixedly connected with the box body; a gas starting timing mark plate is arranged between the gas main switch starting time length timing knob and the front side wall plate of the box body, the gas starting timing mark plate is fixedly arranged on the front side wall plate of the box body, and the front surface of the gas starting timing mark plate is provided with identification scales for representing gas starting time; the first gearwheel is fixedly sleeved on the second rotating shaft; the first pinion and the second gearwheel are coaxially and fixedly sleeved on the third rotating shaft, and the first pinion is meshed with the first gearwheel; the second pinion and the third gearwheel are coaxially and fixedly sleeved on the fourth rotating shaft, and the second pinion is meshed with the second gearwheel; the third pinion and the escape wheel are coaxially and fixedly sleeved on the fifth rotating shaft, and the third pinion is meshed with the third bull gear; the balance wheel is fixedly sleeved on the sixth rotating shaft, the oscillating bar is fixedly connected to the balance wheel, the oscillating bar is parallel to the sixth rotating shaft, and the escape wheel is meshed with the oscillating bar; the hairspring is sleeved on the sixth rotating shaft, the inner end of the hairspring is fixedly connected to the sixth rotating shaft, and the outer end of the hairspring is fixedly connected with the box body.

The coal gas main on-off stopping triggering assembly comprises a ratchet wheel, a pawl supporting frame and a cam; the ratchet wheel is fixedly sleeved on the first rotating shaft; the pawl support frame is vertically and fixedly arranged on a bottom plate of the box body, the pawl is arranged at the top of the pawl support frame, and the tip end of the pawl is meshed with the ratchet of the ratchet wheel; the cam is fixedly sleeved on the second rotating shaft, and the cam is matched with the root end of the pawl in a pushing mode.

The invention has the beneficial effects that:

the forced safety type timing closing and stopping control device for the gas main switch can set the opening time of the gas main switch, and can automatically complete the closing of the gas main switch at the first time after the timing is finished, particularly, the priority of the timing function of the device is higher than the opening priority of the gas main switch, namely, the gas main switch can be opened only after the opening time of the gas main switch is set, otherwise, the gas main switch cannot be opened before the timing is started, so that the forced safety is realized.

Drawings

FIG. 1 is a schematic structural diagram of a forced safety type gas main switch timing on-off control device of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 (with the pawl tips in engagement with the ratchet teeth of the ratchet wheel);

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1 (with the pawl tips disengaged from the ratchet teeth);

in the figure, 1-box, 2-leg, 3-wall, 4-bolt, 5-gas pipeline, 6-gas main switch, 7-gas main switch on-off control knob, 8-first rotating shaft, 9-first coil spring, 10-gas main switch transfer claw, 11-gas switch sign board, 12-gas main switch on-time timing knob, 13-second rotating shaft, 14-third rotating shaft, 15-fourth rotating shaft, 16-fifth rotating shaft, 17-sixth rotating shaft, 18-second coil spring, 19-first large gear, 20-first small gear, 21-second large gear, 22-second small gear, 23-third large gear, 24-third small gear, 25-escapement wheel, 26-balance, 27-swing rod, 28-hairspring, 29-gas start timing sign board, 30-ratchet, 31-pawl, 32-pawl support frame, 33-cam.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

As shown in fig. 1 to 3, a forced safety type timing closing and stopping control device for a gas main switch comprises a box body 1, a gas main switch opening and closing control component, a gas main switch closing and stopping trigger component and a gas main switch opening time timing component; the box body 1 is of a rectangular structure, the outer surface of the rear side wall plate of the box body 1 is fixedly provided with the supporting legs 2, the supporting legs 2 are fixedly connected with the wall body 3 through bolts 4, the gas pipeline 5 is positioned between the rear side wall plate of the box body 1 and the wall body 3, and the gas main switch 6 is positioned on the gas pipeline 5 between the rear side wall plate of the box body 1 and the wall body 3; the gas main switch on-off control assembly, the gas main switch on-off trigger assembly and the gas main switch on-time timing assembly are all arranged on the box body 1; the gas main switch on-off control component is matched with the gas main switch 6 for use; the gas main switch on-off stopping triggering component is positioned between the gas main switch on-off control component and the gas main switch on-time timing component.

The gas main switch opening and closing control assembly comprises a gas main switch opening and closing control knob 7, a first rotating shaft 8, a first coil spring 9 and a gas main switch switching clamping jaw 10; two ends of the first rotating shaft 8 are respectively and rotatably connected to a front side wall plate and a rear side wall plate of the box body 1 through shaft sleeves, the front end of the first rotating shaft 8 extends out of the front side wall plate of the box body 1, and the gas main switch opening and closing control knob 7 is fixedly arranged at the front end of the first rotating shaft 8; the rear end of the first rotating shaft 8 extends out of a rear side wall plate of the box body 1, the gas main switch switching clamping jaw 10 is fixedly installed at the rear end of the first rotating shaft 8, and the gas main switch switching clamping jaw 10 is fixedly clamped and connected with the gas main switch 6; the first coil spring 9 is sleeved on the first rotating shaft 8, the inner end of the first coil spring 9 is fixedly connected with the first rotating shaft 8, and the outer end of the first coil spring 9 is fixedly connected with the box body 1; a gas switch marking plate 11 is arranged between the gas main switch opening and closing control knob 7 and the front side wall plate of the box body 1, the gas switch marking plate 11 is fixedly arranged on the front side wall plate of the box body 1, and a mark for indicating the opening of gas and a mark for indicating the closing of gas are arranged on the front surface of the gas switch marking plate 11.

The gas main switch starting time duration timing assembly comprises a gas main switch starting time duration timing knob 12, a second rotating shaft 13, a third rotating shaft 14, a fourth rotating shaft 15, a fifth rotating shaft 16, a sixth rotating shaft 17, a second coil spring 18, a first large gear 19, a first small gear 20, a second large gear 21, a second small gear 22, a third large gear 23, a third small gear 24, an escape wheel 25, a balance wheel 26, a swing rod 27 and a balance spring 28; two ends of the second rotating shaft 13, the third rotating shaft 14, the fourth rotating shaft 15, the fifth rotating shaft 16 and the sixth rotating shaft 17 are respectively and rotatably connected to a front side wall plate and a rear side wall plate of the box body 1 through shaft sleeves, and the first rotating shaft 8, the second rotating shaft 13, the third rotating shaft 14, the fourth rotating shaft 15, the fifth rotating shaft 16 and the sixth rotating shaft 17 are mutually arranged in parallel; the front end of the second rotating shaft 13 extends out of a front side wall plate of the box body 1, and the starting time period timing knob 12 of the gas main switch is fixedly arranged at the front end of the second rotating shaft 13; the second coil spring 18 is sleeved on the second rotating shaft 13, the inner end of the second coil spring 18 is fixedly connected with the second rotating shaft 13, and the outer end of the second coil spring 18 is fixedly connected with the box body 1; a gas starting timing mark plate 29 is arranged between the gas main switch starting time length timing knob 12 and the front side wall plate of the box body 1, the gas starting timing mark plate 29 is fixedly arranged on the front side wall plate of the box body 1, and the front surface of the gas starting timing mark plate 29 is provided with identification scales for indicating the gas starting time; the first gearwheel 19 is fixedly sleeved on the second rotating shaft 13; the first small gear 20 and the second big gear 21 are coaxially fixed on the third rotating shaft 14 in a sleeved mode, and the first small gear 20 is meshed with the first big gear 19; the second small gear 22 and the third large gear 23 are coaxially and fixedly sleeved on the fourth rotating shaft 15, and the second small gear 22 is meshed with the second large gear 21; the third pinion 24 and the escape wheel 25 are coaxially fixed on the fifth rotating shaft 16 in a sleeved mode, and the third pinion 24 is meshed with the third bull gear 23; the balance wheel 26 is fixedly sleeved on the sixth rotating shaft 17, the swing rod 27 is fixedly connected to the balance wheel 26, the swing rod 27 is parallel to the sixth rotating shaft 17, and the escape wheel 25 is meshed with the swing rod 27; and the balance spring 28 is sleeved on the sixth rotating shaft 17, the inner end of the balance spring 28 is fixedly connected on the sixth rotating shaft 17, and the outer end of the balance spring 28 is fixedly connected with the box body 1.

The gas main switch closing and stopping trigger assembly comprises a ratchet 30, a pawl 31, a pawl supporting frame 32 and a cam 33; the ratchet wheel 30 is fixedly sleeved on the first rotating shaft 8; the pawl support frame 32 is vertically and fixedly arranged on the bottom plate of the box body 1, the pawl 31 is arranged at the top of the pawl support frame 32, and the tip end of the pawl 31 is meshed with the ratchet teeth of the ratchet wheel 30; the cam 33 is fixedly sleeved on the second rotating shaft 13, and the cam 33 is matched with the root end of the pawl 31 in a pushing mode.

The one-time use process of the present invention is described below with reference to the accompanying drawings:

in the initial state, the gas main switch on-off control knob 7 indicates the gas switch mark on the front surface of the gas switch mark plate 11, the gas main switch on-time timing knob 12 indicates the 0 scale mark on the front surface of the gas switch timing mark plate 29, the high point end of the cam 33 is in the state of pushing the root end of the pawl 31, at this time, the tip end of the pawl 31 and the ratchet of the ratchet wheel 30 are in the separated state, in this state, when the gas main switch on-off control knob 7 is rotated and indicates the gas switch mark on the front surface of the gas switch mark plate 11, the output torque can be transmitted to the gas main switch 6 through the first rotating shaft 8 and the gas main switch switching claw 10, thereby controlling the gas main switch 6 to be changed from the off state to the on state, and the first coil spring 9 realizes the storage of elastic potential energy, however, after the gas main switch on-off control knob 7 is loosened, since the tip of the pawl 31 and the ratchet of the ratchet wheel 30 are in a separated state (as shown in fig. 3), the ratchet wheel 30 is not restrained, the elastic potential energy stored by the first coil spring 9 is released rapidly, and drives the first rotating shaft 8 to rotate in a reverse direction, and finally drives the gas main switch switching claw 10 to rotate in a reverse direction until the gas main switch 6 is driven to rapidly change from an on state to an off state, and simultaneously the gas main switch on-off control knob 7 also rotates back to an initial position along with the first rotating shaft 8. That is, as long as the timing is not started, the gas main switch 6 cannot be turned on, thereby realizing the forced safety.

When gas is needed to be used, firstly, the gas main switch opening time timing knob 12 is rotated and indicated on any time scale line on the front surface of the gas opening timing mark plate 29 (if taking a 90min scale line as an example, the total timing time is one and a half hours), after the gas main switch opening time timing knob 12 is screwed in place, the second rotating shaft 13 is indicated to rotate by the same angle along with the gas main switch opening time timing knob 12, so that the cam 33 and the first large gear 19 are driven to synchronously rotate by the same angle, and as the cam 33 rotates, the high point end of the cam 33 is separated from the contact with the root end of the pawl 31, so that the pawl 31 is reset, and the tip end of the pawl 31 is restored to the ratchet engagement state with the ratchet 30 (as shown in fig. 2). In addition, during the screwing process of the gas main switch on duration timing knob 12, the second rotating shaft 13 firstly drives the first bull gear 19 to rotate, and by means of the meshing transmission action among the gears, the first pinion 20, the third rotating shaft 14, the second bull gear 21, the second pinion 22, the fourth rotating shaft 15, the third bull gear 23, the third pinion 24, the fifth rotating shaft 16 and the escape wheel 25 are sequentially driven to rotate, and the escape wheel 25 can realize free rotation without being hindered by the swinging rod 27.

Furthermore, when the gas main switch is opened, the timing knob 12 is screwed in place, the second coil spring 18 realizes the storage of elastic potential energy, when the gas main switch is released and the time-length timing knob 12 is opened, the second coil spring 18 starts to release the elastic potential energy, firstly reversely drives the second rotating shaft 13 to rotate, and drives the escape wheel 25 to rotate reversely after being decelerated by the three-level gear, after the escape wheel 25 rotates by one gear tooth, the oscillating bar 27 and the balance wheel 26 are driven to rotate around the sixth rotating shaft 17 for a fixed angle, while the balance spring 28 continuously reciprocates between storing elastic potential energy and releasing the elastic potential energy along with the swinging of the sixth rotating shaft 17, the releasing of the elastic potential energy of the balance spring 28 reversely drives the sixth rotating shaft 17, the balance wheel 26 and the oscillating bar 27 to reset, so that the reciprocating swing of the balance wheel 26 is realized, and further, the constant-speed reverse rotation of the escape wheel 25 is realized, and finally, the accurate timing is realized, and the process is stopped by the release of the elastic potential energy of the second coil spring 18.

In addition, after the gas main switch opening duration timing knob 12 is screwed in place, because the tip of the pawl 31 restores to the meshing state with the ratchet of the ratchet wheel 30, the gas main switch opening and closing control knob 7 can be rotated at the moment and indicates the gas on mark on the front surface of the gas switch mark plate 11, the output torque can be transmitted to the gas main switch 6 through the first rotating shaft 8 and the gas main switch switching claw 10 in sequence, and then the gas main switch 6 can be controlled to be changed from the closing state to the opening state, meanwhile, the first coil spring 9 realizes the storage of elastic potential energy, after the gas main switch opening and closing control knob 7 is loosened, the ratchet wheel 30 is locked by the pawl 31 and cannot rotate, the first rotating shaft 8 cannot rotate, and at the moment, the elastic potential energy stored by the first coil spring 9 is completely locked and cannot be released.

When the release of the elastic potential energy of the second coil spring 18 is finished, which explains that the timing is finished, at this time, the cam 33 also reversely rotates back to the initial position along with the second rotating shaft 13, so that the high point end of the cam 33 recovers the pushing state of the root end of the pawl 31, the tip end of the pawl 31 is forced to be separated from the ratchet of the ratchet wheel 30, and at the moment when the tip end of the pawl 31 is separated from the ratchet of the ratchet wheel 30, the constraint of the ratchet wheel 30 disappears, the elastic potential energy stored in the first coil spring 9 is quickly released, the first rotating shaft 8 is reversely driven to rotate, and finally the gas main switch switching claw 10 is driven to reversely rotate until the gas main switch 6 is driven to be quickly changed into the closed state from the open state, and the gas main switch on-off control knob 7 also rotates back to the.

If the service time of the gas needs to be further prolonged in the timing process, the gas main switch starting time duration timing knob 12 is continuously screwed in the middle of use, so that the timing time duration can be effectively increased, and the method is convenient and quick.

The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.