KR101641325B1 - Gas valve opening and closing the intermediate unit - Google Patents

Abstract

The present invention relates to an apparatus for opening or closing a gas valve. The gas valve can prevent damage and malfunction by preventing a large load from being generated to multiple gears and a driving motor for opening or closing a gas valve by manually operating the gas valve, and can reduce manufacturing costs by reducing assembling time due to a simple configuration. The apparatus for opening or closing a gas valve comprises: a speed reducing member; an output shaft having one end fixed and connected to the output side of the speed reducing member and the other end protruding toward the outside of the housing, and rotating to correspond to driving of a driving motor; a holding pin having one end inserted into the outer circumferential surface of the output shaft protruding toward the outside of the housing and the other end protruding from the outer circumferential surface of the output shaft; and a rotation gear unit preventing damage to the speed reducing member. The rotation gear unit is installed to be able to rotate and is not separated from the other end of the output shaft by a screw member, so the outer circumferential surface is engaged and connected with the gear unit formed at one portion of the outer circumferential surface of the rotation member for opening or closing a knob. One end of the lower surface of the rotation gear unit accommodates the other end of the holding pin inserted into the output shaft, but the holding pin is held while rotating. The holding pin ticks over in a space in which the holding pin is not held to mutually operate a manual opening and closing knob, and thus the knob of the gas valve can be operated.

Description

[0001] The present invention relates to a gas valve opening and closing intermediate unit,

The present invention relates to a gas intermediate valve opening / closing device, and more particularly, to a gas intermediate valve opening / closing device which is fixed to a gas intermediate valve installed on a gas supply pipe to supply and shut off gas for preventing danger or accident, Which is configured to be able to automatically open and close a gas intermediate valve, and to prevent a large load from being applied to a drive motor and a plurality of gears for opening and closing a gas intermediate valve by manually operating the gas intermediate valve, The present invention relates to a gas intermediate valve opening / closing device for reducing the manufacturing cost by shortening the assembling time by a simple structure.

As is well known, general households and businesses use gas appliances such as gas ranges, gas ovens, and gas boilers that are made from gas such as liquefied petroleum gas (LPG) or liquefied natural gas (LNG) do.

Such a gas appliance is connected to a gas tank such as an outdoor gas storage tank or a city gas corporation through a gas pipe and receives gas. An intermediate valve is installed between the gas appliance and the outdoor gas storage tank or the gas tank.

These intermediate valves are subject to danger such as explosion when gas leaks from gas appliances or piping. Therefore, gas should be used with great caution and the use of intermediate valves is regulated to prevent danger.

Therefore, the user can shut off or open the gas by operating the intermediate valve, thereby preventing the risk in advance.

When cooking or heating using a gas appliance, the user opens the intermediate valve to supply gas to the gas appliance, and turns on the ignition device installed in the gas appliance to ignite the gas.

When the use of the gas appliance is completed, the user turns off the ignition device installed in the gas appliance and extinguishes it, and then closes the intermediate valve to shut off the gas supply.

In this way, each time the user uses the gas appliance, the intermediate valve is opened and then used and closed to achieve the original safety function. However, because of the hassle, the user always keeps the intermediate valve open and uses only the gas appliance ignition device It is often used.

Especially, there is a risk of safety accidents because there are many cases where the gas appliance is left unattended and left for a long time.

That is, current mechanical fuse cocks have incomplete inherent limitations and inconvenience that depend on the user as a safety device.

Therefore, an apparatus for automatically shutting off the intermediate valve has been developed to prevent such danger.

However, in the type in which the valve is automatically opened and closed as described above, the user frequently operates the valve knob manually.

Therefore, even in this type, a large force acts on the motors and the gears for automatically opening and closing the valve, resulting in a problem that the motor and the gears are damaged or their service life is shortened. Particularly, in the structure in which the reduction gears are provided to reduce the torque acting on the motor and to increase the torque acting on the load, a greater force acts on the motor and the gears, thereby further decreasing the durability of the motor and the gears .

In view of this, the valve opening / closing device is disclosed in Patent Application No. 10-2006-0030511.

The conventional valve opening / closing device is for opening / closing an opening / closing valve for shutting off or stopping supply of fluid. The conventional valve opening / closing device includes a motor rotated in normal and reverse directions to drive the opening / closing valve and a control section for applying a driving signal to the motor. A drive device comprising: a drive gear coupled to a rotation shaft of a motor; a driven gear coupled to the drive gear so as to rotate together with the drive gear; a rotatable gear rotatable upon rotation of the driven gear; A power transmitting member for power-connecting the rotating body and the opening / closing valve so that the opening / closing valve rotates together when the rotating body rotates; And when the rotation angle sensing means detects that the rotation angle is detected by the rotation angle sensing means, The driven gear is configured to rotate reversely by the motor in a section in which the driven gear is allowed to idle with respect to the rotating body, the rotating body has a stopping jaw and a transmission gear portion disposed coaxially with the driven gear, The transmission member is a driven gear that is gear-connected to the transmission gear portion of the rotating body and is power-connected to the opening / closing valve. The driven gear is provided with a retaining portion provided at a position where the retaining jaw can be pressed while the driven gear is rotating The rotating body rotates together with the driven gear in a section where the engaging portion presses the engaging jaw, and the rotating body idles relative to the driven gear in a section where the engaging portion is spaced apart from the engaging jaw.

However, when the valve is operated in the manual mode as described above, the conventional valve opening / closing apparatus constructed as described above can prevent damage and failure due to a large load being not applied to the motor and the gears for driving the valve. A driven gear having a latching portion formed on an upper surface thereof and a rotating body having a latching protrusion formed on a bottom surface thereof so as to be caught by the latching portion of the driven gear must be manufactured separately.

In addition, as described above, since the conventional valve opening / closing device must be installed inside the housing, it takes a long time to assemble the valve opening / closing device, so that the manufacturing cost is increased. have.

Patent Application No. 10-2006-0030511, filing date; April 04, 2006 The name of the invention; Valve opening / closing device

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for operating a gas intermediate valve, The present invention provides a gas intermediate valve opening / closing device that prevents breakage and failure of a component by preventing a large load from being applied to a motor and a plurality of gears, There is a purpose.

Other objects of the present invention will become apparent as the description proceeds.

According to an aspect of the present invention, there is provided a gas intermediate valve comprising: a rear case including a part of a gas intermediate valve having a knob; A front case having a receiving groove formed at a front side thereof and a power supply unit accommodated at the other side thereof; and an on / off switch and a timer setting device for blocking a front side of the front case, And the operation range is limited by the sensing unit, so that the manual opening / closing knob < RTI ID = 0.0 > And a rotary member for opening and closing the knob fixedly connected at one end thereof, And the rotation rate is reduced by receiving the rotational force input from the driving shaft of the driving motor driven in the forward and reverse directions as the power is applied to the front middle case, An output shaft provided at one end of the decelerating member so as to be rotatable in correspondence to the driving motor driven by the other end of the decelerating member, And the other end of the pin is provided so as to protrude from the outer circumferential surface of the output shaft and is rotatably installed at the other end of the output shaft without being separated through a screw member, Is provided with a gear portion formed on a part of the outer circumferential surface of the knob opening / And the other end of the engaging pin inserted into the output shaft is received by the bottom face of the engaging pin so that the engaging pin is caught while rotating so that the manual opening and closing knob is operated manually And a rotator unit provided to operate the knob of the gas intermediate valve so as to prevent damage to the deceleration member.

The sensing unit includes a knob opening sensor for detecting an open state of the knob at one side of the bottom of the control unit fixed to the receiving groove of the front case, A knob closing sensor disposed to detect a closed state of the knob, the knob closing sensor being spaced apart from an opening of the knob opening sensor so as to have an angle to open the knob, and a gear portion formed on an upper end peripheral surface of the knob opening / And a proximity sensor provided to operate the knob opening detection sensor and the knob closing detection sensor in correspondence with the rotation of the rotary member for opening and closing the knob.

As described above, according to the gas intermediate valve opening / closing apparatus of the present invention, the opening / closing device configured to automatically open and close the gas intermediate valve can be simply configured to operate the gas intermediate valve manually A large load is not applied to the motor and the plurality of gears to prevent breakage and failure of the parts, and the manufacturing cost can be shortened by shortening the assembling time with a simple structure.

1 is a partially exploded view showing a gas intermediate valve automatic locking device in which a gas intermediate valve opening / closing device according to the present invention is installed.
2 is a view showing a state in which the gas middle valve opening / closing device according to the present invention is installed in the gas middle valve automatic locking device.
3 is a view showing a gas intermediate valve opening / closing device according to the present invention.
4 is an exploded view showing a gas intermediate valve opening / closing device according to the present invention.
5 is a view showing the interior of a gas intermediate valve opening / closing device according to the present invention.

Hereinafter, a gas intermediate valve opening / closing apparatus according to an embodiment of the present invention will be described in detail.

First, it should be noted that, in the drawings, the same components or parts have the same reference numerals as much as possible. In describing the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as not to obscure the gist of the invention.

As shown in the figure, the gas middle valve opening / closing apparatus according to the present invention is installed in a gas intermediate valve having a knob and is automatically installed in a gas middle valve automatic locking device configured to open and close the knob automatically, The intermediate valve knob of the gas can be automatically opened and closed, and a driving motor for opening and closing the knob of the gas intermediate valve due to the manual operation of the gas intermediate valve and a large load on the plurality of gears So that breakage and failure of the parts can be prevented, and the manufacturing cost can be reduced by shortening the assembling time with a simple structure.

That is, the gas middle valve opening / closing apparatus according to the present invention includes a rear case 11, which can accommodate a part of a gas intermediate valve D having a knob N as shown in FIGS. 1 to 5, (Not shown) to be fixed on the gas intermediate valve D, a receiving groove 12a is formed on one side of the front side, and a power supply unit (battery) is provided on the other side. And a cover 13 covering the front side of the front case 12 and having an on or off switch and a timer setting button, And is operated in response to the control of the control unit 14 by pressing the on or off switch so that the operation range is limited by the sensing unit 15, (16) and a fixed end Closing knob opening / closing rotary member 17 of the gas middle valve automatic locking device 10 including the knob opening and closing rotary member 17, A deceleration member 110 provided to receive a rotational force input from a driving shaft (not shown) of a driving motor 112 driven in a reverse direction to decelerate and output the rotational rate, The other end of the output shaft 130 protrudes out of the housing 111 and is rotatably supported by the driving motor. The output shaft 130 protrudes to the outside of the housing 111, And the other end of the output shaft 130 is rotatably inserted into the output shaft 130 so that the output shaft 130 is rotatably inserted into the output shaft 130. The other end of the output shaft 130 is inserted into the output shaft 130, A gear portion 17a formed on a part of the outer circumferential surface of the knob opening and closing rotary member 17 and a gear portion 17b formed on an outer circumferential surface of the gear portion 17a, And a receiving groove 172 is formed on one surface of the receiving groove 172 to receive the engaging pin 150. The receiving groove 172 is formed in the inner circumferential surface of the receiving groove 172, The manual pivoting knob 16 is manually operated by idling in the space of the receiving groove 172 in which the latching pin 150 is not engaged so that the latching pin 150 can be hooked, And a rotary gear unit 170 which is provided to operate the knob N of the gas intermediate valve D to prevent the reduction member 110 from being damaged.

The sensing unit 15 includes a control unit 14 that is fixed to the receiving groove 12a of the front case 12 through a plurality of screws, A knob opening detection sensor 15a provided at one side of the bottom surface of the knob opening sensor 15a for detecting an open state of the knob N, A knob closing detection sensor 15b provided to detect the closed state of the knob N so as to be spaced apart from the knob opening and closing rotary member 17 by a predetermined distance, And a proximity sensor 15c provided so as to operate the knob opening detection sensor 15a and the knob close detection sensor 15b corresponding to the rotation of the knob opening and closing rotary member 17.

That is, when the proximity sensor 15c is positioned at the knob opening detection sensor 15a and the knob close detection sensor 15b by the rotation of the knob opening / closing rotary member 17, The control unit 14 determines whether the rotation angle of the knob opening / closing rotary member 17 is equal to 290 degrees corresponding to the applied signal, and then, The motor 112 is driven in the other direction and a program is stored such that the pin 150 having one end fixed to the outer circumferential surface of the other end of the output shaft 130 is reversely rotated at an angle of 290 degrees.

The angle at which the engagement pin 150 is reversely rotated at an angle of 290 degrees is determined by manually turning the manual opening and closing knob 16 after the knob N is rotated in one direction by the rotation of the driving motor 112 Refers to an angle at which the rotary machine section 170 can rotate relative to the follower synchronizer 114 without being constrained by the follower synchronizer 114 to be described later when the knob N is rotated in the other direction .

Hereinafter, the gas intermediate valve opening / closing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

2 to 5, the reduction gear 110 of the gas middle valve opening / closing apparatus according to the present invention is fixed to one side of the receiving groove 12a of the front case 12 through a plurality of screws A cover portion 111a which is openable and closable at the upper portion of the receiving portion 111a and has a hole formed at one side thereof so as to allow the other end of the output shaft 130 to pass therethrough, And a control unit 14 which is fixedly installed on one side of the inside of the housing 111a of the housing 111 and is capable of forward and reverse driving according to application of power by control of the controller 14 A drive motor 112 provided with a drive gear (not shown) fixed to the drive shaft, and a drive gear 112 connected to one side of the drive motor 112 so as to be rotatable about the respective reduction gear shaft, And the driving motor 112 is driven A reduction gear unit 113 provided to reduce the transmission ratio and a reduction gear unit 113 installed on one side of the reduction gear unit 113 so as to be rotatable about a driven gear shaft A follower gear 114a is formed on the outer circumferential surface and a follower synchronizer 114 is provided at the center of the shaft so that a through hole (not shown) is formed to fix one end of the output shaft 130. [

As shown in FIGS. 4 and 5, the reduction gear unit 113 includes first, second, third, and fourth reduction gears (not shown) The first and second speed reducer units 113a, 113b, 113c, and 113d, the first and second speed reducer units 113a, 113b, 113c, and 113d, The fourth reduction gear unit of the fourth reduction gear unit 113d is disposed on the upper side of the second reduction gear unit by being installed to be rotatable about the axis of the second reduction gear unit 113d, The configuration of the reduction gear unit is well known in the art and will not be described in detail below.

4 and 5, the other end of the output shaft 130 is fixed to the through hole formed in the follower shaft portion 114 of the reduction gear unit 113, so that the bottom surface of the output shaft 130 receives the third rotation shaft And is configured to be rotatable about the third rotation shaft and to be exposed from the lid part 111b of the other end housing 111 and to receive the engagement pin on the outer circumferential surface of the protruded part.

That is, the output shaft 130 is formed with chamfered portions on the outer circumferential surfaces facing each other so as to be fixed by being inserted into the through holes formed in the follower gear portion 114 via fixing members (not shown) (Not shown) having an insertion groove formed therein so as to be rotatable by inserting a third rotation shaft and a lid portion 111b of the housing 111, which extend through the enlarged diameter piece 131, And an insertion piece 132 formed to protrude from the protruding portion of the insertion piece 132 and to be rotatable in the axial direction of the insertion piece 132. The insertion piece 132 has a screw groove And a receiving groove (not shown) is formed on the bottom of the outer circumferential surface so as to insert one end of the engaging pin 150. The receiving groove is formed by a screw member engaged with the screw groove 132a, Once the shovel Of the engaging yongpin 150 is one end of the pressing is formed to communicate with the screw hole (132a) configured to be fixed.

The gas intermediate valve opening / closing device according to the present invention thus constructed is installed in a gas intermediate valve provided with a knob to press the ON switch to supply gas, The driving motor 112 is driven by the power of the controller 14 under the control of the controller 14.

When the driving motor 112 is rotated in one direction, the driving gear coupled to the driving shaft of the driving motor 112 rotates, thereby reducing the rotation ratio of the driving gear by rotating the reduction gear unit 113.

When the fourth reduction gear 113d of the reduction gear unit 113 rotates, the follower synchronizer 114 rotates in one direction or clockwise to rotate the output shaft 130 in the same direction as the follower gear 114 Direction.

The engagement pin 150 is hooked on one surface of the engagement protrusion 173 formed on the inner circumferential surface of the receiving groove 172 of the rotary unit 170 while the output shaft 130 rotates clockwise, Is rotated in the clockwise direction.

The knob opening / closing rotary member 17 and the manual opening / closing knob 16 fixed to the rotary member 17 rotate simultaneously in the counterclockwise direction, and the knob N of the gas opening / Closing valve (D) is opened because it rotates in the same direction as the knob opening / closing rotary member (17).

The knob opening and closing rotary member 17 and the manual opening and closing knob 16 are rotated counterclockwise so that the proximity sensor 15c of the sensing unit 15 is provided on one side of the bottom surface of the control unit 14. [ The knob opening detection sensor 15a detects the knob opening detection sensor 15a and transmits it to the controller 14 side.

Accordingly, the control unit 14 applies power to the driving motor 112 to be driven in the other direction in accordance with the input signal.

The driving motor 112 is driven in the opposite direction so that the engaging pin 150 is positioned at the angle of 290 degrees to the other surface side of the engaging projection 173 formed in the receiving groove 172 of the rotating machine unit 170, The driving of the driving motor 112 is stopped by the power supply being cut off under the control of the controller 140.

When the valve opening / closing apparatus according to the present invention is operated as described above, the gas opening / closing valve (D) is opened and gas can be supplied.

On the other hand, when the user presses the OFF switch to cut off the gas supply, the drive motor 112 is driven in the reverse direction under the control of the control unit 14, and thereafter the rotation ratio is reduced through the reduction gear unit, (130) is rotated counterclockwise.

While the output shaft 130 rotates counterclockwise, the engagement pin 150 is hooked on the other surface of the engagement protrusion 173 formed on the inner circumferential surface of the receiving groove 172 of the rotary shaft unit 170, Is rotated counterclockwise.

The knob N of the gas opening / closing valve due to the simultaneous rotation of the knob opening / closing rotary member 17 and the manual opening / closing knob 16 fixed thereto and being rotated in the clockwise direction due to the rotation of the rotary member 170, The gas opening / closing valve D is closed because it rotates in the same direction as the rotating member 17.

When the knob opening and closing rotary member 17 and the manual opening and closing knob 16 are rotated in the clockwise direction, the proximity sensor 15c of the sensing unit 15 is rotated by the knob The knob opening sensor 15b detects the knob opening sensor 15b and transmits the knob opening sensor 15b to the controller 14.

Accordingly, the controller 14 applies power to the drive motor 112 to be driven in a forward direction corresponding to the input signal.

The driving motor 112 is driven in the forward direction so that the engaging pin 150 is positioned at a 290 degree angle to one side of the engaging projection 173 formed in the receiving groove 172 of the rotating machine unit 170, The driving of the driving motor 112 is stopped by the power supply being cut off under the control of the controller 140.

On the other hand, when the manual opening / closing knob 16 is rotated in the counterclockwise direction to manually open / close the gas intermediate valve in the closed state, since the engaging pin 150 is rotated by 290 degrees, Becomes idle with respect to the follower synchronizer 114.

Therefore, since the first, second, third, and fourth speed reduction gear units 113a, 113b, 113c, and 113d of the reduction gear unit 113 and the drive motor 112 are not rotated and operated, And it is possible to prevent breakage.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10; Gas intermediate valve automatic locking device 11; Rear case
12; Front case 13; cover
14; A control unit 15; The sensing unit
16; A manual opening / closing knob 17; The rotary member for opening and closing the knob
100; Gas intermediate valve opening / closing device 110; Deceleration member
130; An output shaft 150; Jig pin
170; A rotating machine part D; Gas intermediate valve
N; Knob

Claims (5)

The gas intermediate valve D is fixedly mounted on the gas intermediate valve D by coupling the rear case 11 accommodating part of the gas intermediate valve D having the knob N to each other via a plurality of engaging members A front case 12 having a receiving groove 12a formed on one side of the front side and a power supply unit accommodated on the other side of the front case 12 and a front case 12 on the front side of the front case 12, Or a cover 13 having an off switch and a timer setting button so as to control the control unit 14 by pressing the on or off switch And a knob opening / closing rotary member 17 whose one end is fixedly connected to the manual opening / closing knob 16 while the operating range is limited by the sensing unit 15, The knob opening / closing rotary member 17 ) Of the gas intermediate valve opening / closing device
And is rotatably supported by the housing 111 so as to be fixed to the front case 12 and receives the rotational force input from the driving shaft of the driving motor 112 driven in the forward and reverse directions as the power is applied, (110);
An output shaft 130 protruded to the outside of the housing 111 by being fixedly connected at one end to the output side of the deceleration member 110 and rotatably provided so as to be rotatable in correspondence with driving of the driving motor;
An engaging pin 150 having one end inserted into the outer circumferential surface of the output shaft 130 protruding outside the housing 111 and the other end protruding from the outer circumferential surface of the output shaft 130;
A gear portion 17a formed on a part of an outer circumferential surface of the knob opening / closing rotary member 17 by being installed to be rotatable without being separated through a screw member which is screwed to the other end of the output shaft 130, And the other end of the engaging pin 150 inserted in the output shaft 130 is received in the bottom face of the engaging pin 150 so that the engaging pin 150 is engaged while rotating, The knob N of the gas intermediate valve D can be actuated by manually operating the manual opening and closing knob 16 by idling to prevent the damper member 110 from being damaged, The fisher 170
And the gas intermediate valve opening / closing device.
The method according to claim 1,
The sensing part 15 provided to limit the operation range of the manual opening and closing knob 16 is provided with a knob N at one side of the bottom surface of the control part 14 fixed to the receiving groove 12a of the front case 12. [ A knob opening detection sensor 15a provided to sense an open state of the knob N and a closed state of the knob N being separated from an end of the knob opening detection sensor 15a by an angle at which the knob N is opened, And a knob closing sensor 15b provided for the knob opening and closing member 17 and a gear portion 17a formed on the outer peripheral surface of the upper end of the knob opening and closing member 17, And a proximity sensor (15c) provided to operate the knob opening detection sensor (15a) and the knob closing detection sensor (15b) correspondingly.
The method according to claim 1,
The deceleration member 110 includes a receiving portion 111a having an upper portion and a portion of one side opened so as to be fixed to one side of the receiving groove 12a of the front case 12, And a cover 111b formed on one side of the upper surface of the housing 111 so as to allow the other end of the output shaft 130 to pass therethrough and a cover 111b fixed to one side of the housing 111a of the housing 111 A drive motor 112 provided with a drive gear fixed to a drive shaft so as to be driven forward and backward in accordance with the application of power by control of the control unit 14, A reduction gear unit 113 provided to be rotatably mounted on the reduction gear shaft to be connected to the drive gear so as to reduce a rotation ratio due to driving of the drive motor 112, Can be rotated on the driven gear axis A follower gear 114a is formed on the outer circumferential surface of the reduction gear unit 113 so as to be connected to the reduction gear unit 113 by being installed thereon and a follower gear 114 is provided on the center of the reducer gear unit 114 to have a through hole for fixing one end of the output shaft 130, And the gas intermediate valve opening / closing device.
The method according to claim 1 or 3,
The output shaft 130 is formed with chamfered portions on the outer circumferential surfaces opposed to each other so as to be fixed by being inserted into the through holes formed in the follower fisher portion 114 with the fixing member interposed therebetween. And a rotatable fisher unit 170 extending from the lid part 111b of the housing 111 through the enlarged diameter piece 131 and extending from the lid part 111b and protruding from the lid part 111b of the housing 111. [ A screw groove 132a is formed at the center of the upper end surface of the insert piece 132 so that a screw member can be screwed into the insert piece 132, And one end of the engaging pin 150 into which the one end of the engaging pin 150 is inserted is inserted and fixed to the receiving groove by a screw member which is engaged with the screw groove 132a Gas to the intermediate valve opening and closing device, characterized in that is formed to be communicated with the screw hole (132a).
The method according to claim 1,
The rotary member 170 is rotatably inserted into the center portion of the rotary shaft 170 so that the other end of the output shaft 130 is rotatably inserted into the center of the output shaft 130, A receiving groove 172 is formed on one surface of the receiving groove 172 so as to receive the engaging pin 150. The receiving groove 172 is formed in the receiving groove 172, Wherein a locking protrusion (173) protrudes from the inner circumferential surface of the inner circumferential surface of the output shaft (130) so that the engagement pin (150) can be engaged while the output shaft (130) rotates.

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