CN111009767B

CN111009767B - Socket with protect function with electrical apparatus plug

Info

Publication number: CN111009767B
Application number: CN202010049252.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Ningbo Vichnet Technology Co ltd
Current assignee: NINGBO VICHNET TECHNOLOGY Co.,Ltd.
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-09-15
Anticipated expiration: 2040-01-16
Also published as: CN111009767A

Abstract

The invention discloses a socket with the function of protecting an electric appliance plug, which comprises a shell, wherein a pin protecting device is arranged on the shell, the pin protecting device comprises a contact cavity arranged in the shell, the right wall of the contact cavity is communicated with a jack with a rightward opening, the left wall of the contact cavity is fixedly provided with a reed, a sliding plate is arranged in the contact cavity and between the jack and the reed, the sliding plate is provided with an insulating sleeve, a trigger device is arranged in the pin protecting device, and a reset device is arranged below the pin protecting device. The operation of pulling out the plug is avoided.

Description

Socket with protect function with electrical apparatus plug

Technical Field

The invention relates to the technical field of circuit protection, in particular to a socket with an electric appliance plug protection function.

Background

The domestic AC power plug is generally connected with a socket, and is a male connector with a bar-shaped or copper plate-shaped protrusion, and the plug is inserted into a female connector type power socket with a groove or a concave hole to supply power to an electric appliance and ensure the normal operation of the electric appliance. The present invention sets forth a device that solves the above problems.

Disclosure of Invention

The technical problem is as follows:

one of the main causes of household fire is caused by the socket, especially when the plug is not inserted to the exposed part, the fire is easily caused, and the fire threatens the property and personal safety of people greatly.

In order to solve the problems, the socket with the electrical appliance plug protection function is designed in the embodiment, the socket with the electrical appliance plug protection function comprises a shell, a pin protection device is arranged on the shell and comprises a contact cavity arranged in the shell, the right wall of the contact cavity is communicated with a jack with a rightward opening, a reed is fixedly arranged on the left wall of the contact cavity and on the left side of the jack, a sliding plate is arranged in the contact cavity and between the jack and the reed, an insulating sleeve is arranged on the sliding plate and penetrates between the jack and the reed in the left-right direction, the left end of the insulating sleeve can be inserted between the reeds, a metal pin of a plug can penetrate through the jack and the insulating sleeve at the corresponding position, a trigger device is arranged in the pin protection device and comprises a first slider cavity which is arranged in the right end face of the shell and between the three jacks, a first sliding block is arranged in the first sliding block cavity in a left-right sliding manner, a push rod with the right end extending out is fixedly arranged on the right end face of the first sliding block, a first pressure sensor is fixedly arranged in the right end face of the push rod, a second pressure sensor is fixedly arranged in the right end face of the shell, a third spring is fixedly connected between the first sliding block and the inner wall of the first sliding block cavity, when a metal pin of a plug is completely inserted into the socket, the plug can push the push rod to the left, a reset device is arranged below the pin protection device and comprises a second sliding block cavity communicated with the lower wall of the contact cavity, a second sliding block is arranged in the second sliding block cavity in a left-right sliding manner, the lower end of the sliding plate is fixedly connected to the upper end face of the second sliding block, a first tooth socket is arranged on the lower end face of the second sliding block, and a gear, the rear wall of the gear cavity is rotatably provided with a first gear meshed with the first tooth groove, and the front end face of the first gear is provided with a gear groove with a forward opening. Preferably, the pin protection device comprises a limiting rod fixedly arranged at the vertically symmetrical position of the right wall of the contact cavity, a first end cap is fixedly arranged at the left end of the limiting rod, two limiting holes are formed in the upper side and the lower side of the sliding plate and communicated with the limiting rod at the same height position left and right, the sliding plate is connected to the limiting rod in a left-right sliding mode through the limiting holes, and a first spring is fixedly connected between the sliding plate and the first end cap.

Preferably, the triggering device comprises a clamping groove communicated with the upper wall of the limiting hole on the lower side, a clamping block cavity with an upward opening is formed in the upper end face of the limiting rod on the lower side, a clamping block with an upper end capable of extending into the clamping groove is arranged in the clamping block cavity in a vertically sliding manner, a second spring is fixedly connected between the clamping block and the inner wall of the clamping block cavity, a pull wire is fixedly arranged at the lower end of the clamping block, a first support rod cavity is communicated with the lower wall of the first slide block cavity, a first support rod with an upper end capable of extending into the first slide block cavity is arranged in the first support rod cavity in a vertically sliding manner, and one end of the pull wire penetrates through the left wall of the first support rod cavity and is fixedly connected to the first support.

Preferably, resetting means locates including the intercommunication the third slider chamber of gear chamber antetheca, gliding two third sliders that are equipped with around the third slider intracavity, third slider chamber left side wall intercommunication is equipped with fourth slider chamber, gliding fourth slider that is equipped with around the fourth slider intracavity, third slider left end fixed connection in fourth slider right-hand member face, the fourth slider with fixedly connected with fourth spring between the fourth slider intracavity wall.

Preferably, the rear side the third slider is gone up the front and back and is run through and the rotatable first pivot that is equipped with, first pivot front end in the fixed second end cap that is equipped with between the third slider, the fixed second gear that is equipped with in first pivot rear end, the fixed internal gear that is equipped with in third slider cavity lateral wall rear side, the second gear can mesh in the internal gear, the front side run through and the rotatable second pivot that is equipped with around on the third slider, second pivot rear end in fixed third end cap that is equipped with between the third slider, the second pivot with fixedly connected with torsional spring between the third end cap.

Preferably, a rotary disc cavity is arranged in the front wall of the third sliding block cavity, a third rotating shaft is rotatably arranged in the rear wall of the rotary disc cavity, a rotary disc is fixedly arranged at the front end of the third rotating shaft, the rear end of the rotary disc extends into the third sliding block cavity and is provided with a fifth sliding block cavity with a backward opening, a rectangular sliding block is arranged in the fifth sliding block cavity in a front-back sliding mode, and the front end of the second rotating shaft extends into the fifth sliding block cavity and is fixedly connected to the rear end face of the rectangular sliding block.

Preferably, the left end face of the fourth slider is provided with a supporting groove with a leftward opening, the left wall of the cavity of the fourth slider is communicated with a second supporting rod cavity, a motor is fixedly arranged in the left wall of the second supporting rod cavity, the right end of the motor is in power connection with a screw rod, a second supporting rod which is in threaded connection with the screw rod and can slide left and right in the cavity of the second supporting rod is arranged, the front end face of the second supporting rod is provided with a second tooth groove, and the right end of the second supporting rod can extend into the inclined plane in the supporting groove to support and push the fourth slider to slide backwards.

Preferably, the front wall of the second lever abutting cavity is communicated with a worm gear cavity, a fourth rotating shaft is rotatably arranged between the upper wall and the lower wall of the worm gear cavity, a third gear meshed with the second tooth groove is fixedly arranged on the fourth rotating shaft, a worm wheel is fixedly arranged on the fourth rotating shaft and above the third gear, a fifth rotating shaft is rotatably arranged in the front wall of the worm wheel cavity, a worm meshed with the worm wheel is fixedly arranged at the rear end of the fifth rotating shaft, the left wall of the turntable cavity is communicated with a transmission cavity, the front end of the fifth rotating shaft extends into the transmission cavity and is fixedly provided with a first belt wheel, a sixth rotating shaft with the rear end fixedly connected with the center of the front end surface of the turntable is rotatably arranged in the front wall of the turntable cavity, and a second belt wheel is fixedly arranged on the sixth rotating shaft and on the right side of the first belt wheel, and a transmission belt is wound between the first belt wheel and the second belt wheel.

The invention has the beneficial effects that: the invention can automatically disconnect the contact with the metal pin when not in use or the plug is not plugged firmly or the plug is loose, thereby avoiding the possibility of electric shock when people contact the metal pin, simultaneously avoiding the occurrence of circuit failure caused by arc discharge due to poor contact, and disconnecting the contact of the metal pin and the reed when the plug needs to be pulled out in thunderstorm weather, thereby avoiding the operation of pulling out the plug.

Drawings

For ease of illustration, the invention is described in detail by the following specific examples and figures.

FIG. 1 is a schematic view of the overall structure of a socket with protection function for plug of electrical appliance according to the present invention;

FIG. 2 is a sectional view taken in the direction "A-A" of FIG. 1;

FIG. 3 is a sectional view taken in the direction "B-B" of FIG. 1;

fig. 4 is a cross-sectional view taken along the direction "C-C" of fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, for ease of description, the orientations described below will now be defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The invention relates to a socket with the protection function of a plug of an electrical appliance, which is mainly applied to safe electricity utilization and protection of the plug of the electrical appliance, and the invention is further explained by combining the attached drawings of the invention:

the invention relates to a socket with a plug protection function for an electrical appliance, which comprises a shell 11, wherein a plug protection device 101 is arranged on the shell 11, the plug protection device 101 comprises a contact cavity 12 arranged in the shell 11, the right wall of the contact cavity 12 is communicated with a jack 13 with a right opening, a reed 14 is fixedly arranged on the left wall of the contact cavity 12 and on the left side of the jack 13, a sliding plate 17 is arranged in the contact cavity 12 and between the jack 13 and the reed 14, an insulating sleeve 20 is arranged on the sliding plate 17 and between the jack 13 and the reed 14 in a left-right penetrating manner, the left end of the insulating sleeve 20 can be inserted between the reeds 14, a metal plug of the plug can pass through the jack 13 and the insulating sleeve 20 at the corresponding position, a trigger device 102 is arranged in the plug protection device 101, the trigger device 102 comprises a first slide block cavity 26 which is arranged in the right end face of the shell 11 and between the three jacks 13, a first slide block 27 is arranged in the first slide block cavity 26 in a left-right sliding manner, a push rod 28 with the right end extending outwards is fixedly arranged on the right end face of the first slide block 27, a first pressure sensor 29 is fixedly arranged in the right end face of the push rod 28, a second pressure sensor 73 is fixedly arranged in the right end face of the shell 11, a third spring 30 is fixedly connected between the first slide block 27 and the inner wall of the first slide block cavity 26, when a metal pin of a plug is completely inserted into the socket, the plug can push the push rod 28 to the left, a reset device 103 is arranged below the pin protection device 101, the reset device 103 comprises a second slide block cavity 33 communicated with the lower wall of the contact cavity 12, a second slide block 34 is arranged in the second slide block cavity 33 in a left-right sliding manner, the lower end of the slide plate 17 is fixedly connected to the upper end face of the second slide block 34, and a first tooth groove 35 is arranged on the, the lower wall of the second sliding block cavity 33 is communicated with a gear cavity 36, the rear wall of the gear cavity 36 is rotatably provided with a first gear 37 meshed with the first tooth groove 35, and the front end face of the first gear 37 is provided with a gear groove 38 with a forward opening.

Advantageously, as will be described in detail below, the pin protection device 101 includes a limiting rod 15 fixedly disposed at a vertically symmetrical position on a right wall of the contact chamber 12, a first end cap 16 is fixedly disposed at a left end of the limiting rod 15, two limiting holes 18 are disposed on upper and lower sides of the sliding plate 17 and penetrate left and right at a same height position as the limiting rod 15, the sliding plate 17 is connected to the limiting rod 15 through the limiting holes 18 in a left-right sliding manner, and a first spring 19 is fixedly connected between the sliding plate 17 and the first end cap 16.

Advantageously, as will be described in detail below, the triggering device 102 includes a clamping groove 21 communicated with an upper wall of the limiting hole 18 disposed on a lower side, a clamping block cavity 22 having an upward opening is disposed on an upper end surface of the limiting rod 15 disposed on the lower side, a clamping block 23 having an upper end capable of extending into the clamping groove 21 is slidably disposed in the clamping block cavity 22 in the vertical direction, a second spring 24 is fixedly connected between the clamping block 23 and an inner wall of the clamping block cavity 22, a pulling wire 25 is fixedly disposed at a lower end of the clamping block 23, a first resisting rod cavity 31 is communicated with a lower wall of the first sliding block cavity 26, a first resisting rod 32 having an upper end capable of extending into the first sliding block cavity 26 is slidably disposed in the first resisting rod cavity 31 in the vertical direction, and one end of the pulling wire 25 passes through a left wall of the first resisting rod cavity 31 and is fixedly connected to the first resisting rod 32.

Beneficially, the reset device 103 is described in detail below, the reset device 103 includes a third slider cavity 39 communicated with the front wall of the gear cavity 36, two third sliders 40 are provided in the third slider cavity 39 and are capable of sliding back and forth, a fourth slider cavity 41 is provided in the left wall of the third slider cavity 39 and is communicated with the left wall of the fourth slider cavity 41, a fourth slider 42 is provided in the fourth slider cavity 41 and is capable of sliding back and forth, the left end of the third slider 40 is fixedly connected to the right end face of the fourth slider 42, and a fourth spring 43 is fixedly connected between the fourth slider 42 and the inner wall of the fourth slider cavity 41.

Beneficially, the third slider 40 on the rear side is provided with a first rotating shaft 44 which penetrates forward and backward and is rotatable, a second end cap 45 is fixedly arranged between the first rotating shaft 44 and the third slider 40 at the front end of the first rotating shaft, a second gear 46 is fixedly arranged at the rear end of the first rotating shaft 44, an internal gear 47 is fixedly arranged on the rear side of the side wall of the third slider cavity 39, the second gear 46 can be meshed with the internal gear 47, the third slider 40 on the front side is provided with a second rotating shaft 48 which penetrates forward and backward and is rotatable, a third end cap 49 is fixedly arranged between the third slider 40 at the rear end of the second rotating shaft 48, and a torsion spring 50 is fixedly connected between the second rotating shaft 48 and the third end cap 49.

Beneficially, a rotary disc cavity 51 is arranged in the front wall of the third slider cavity 39, a third rotating shaft 52 is rotatably arranged in the rear wall of the rotary disc cavity 51, a rotary disc 53 is fixedly arranged at the front end of the third rotating shaft 52, the rear end of the rotary disc 53 extends into the third slider cavity 39 and is provided with a fifth slider cavity 54 with a backward opening, a rectangular slider 55 is arranged in the fifth slider cavity 54 in a front-back sliding manner, and the front end of the second rotating shaft 48 extends into the fifth slider cavity 54 and is fixedly connected to the rear end face of the rectangular slider 55.

Beneficially, a supporting groove 56 with a leftward opening is formed in the left end face of the fourth slider 42, a second supporting rod cavity 57 is formed in the left wall of the fourth slider cavity 41 in a communicating manner, a motor 58 is fixedly arranged in the left wall of the second supporting rod cavity 57, a screw rod 59 is connected to the right end of the motor 58 in a power mode, a second supporting rod 60 connected to the screw rod 59 in a threaded manner is arranged in the second supporting rod cavity 57 and capable of sliding left and right, a second tooth groove 61 is formed in the front end face of the second supporting rod 60, and the right end of the second supporting rod 60 can extend into the inner inclined face of the supporting groove 56 to support and push the fourth slider 42 to slide back.

Beneficially, a worm wheel cavity 72 is provided in front wall of the second rod abutting cavity 57 in communication, a fourth rotating shaft 62 is rotatably provided between upper and lower walls of the worm wheel cavity 72, a third gear 63 engaged with the second tooth groove 61 is fixedly provided on the fourth rotating shaft 62, a worm wheel 64 is fixedly provided on the fourth rotating shaft 62 and above the third gear 63, a fifth rotating shaft 65 is rotatably provided in front wall of the worm wheel cavity 72, a worm 66 engaged with the worm wheel 64 is fixedly provided at rear end of the fifth rotating shaft 65, a transmission cavity 67 is provided in communication with left wall of the turntable cavity 51, front end of the fifth rotating shaft 65 extends into the transmission cavity 67 and is fixedly provided with a first pulley 68, a sixth rotating shaft 69 rotatably provided in front wall of the turntable cavity 51 and having rear end fixedly connected to center of front end face of the turntable 53, a second pulley 70 is fixedly provided on the sixth rotating shaft 69 and on right side of the first pulley 68, a transmission belt 71 is wound between the first pulley 68 and the second pulley 70.

The following describes in detail the use steps of a socket with a protection function for a plug of a consumer with reference to fig. 1 to 4:

at the beginning, the sliding plate 17 is at the left limit position, the first spring 19 is in a compressed state, the left end of the insulating sleeve 20 is inserted between the spring pieces 14, the upper end of the clamping block 23 is in the clamping groove 21, the first sliding block 27 is at the right limit position, the first abutting rod 32 is at the upper limit position, the upper end of the first abutting rod extends into the first sliding block cavity 26, the fourth sliding block 42 is at the front limit position, the second gear 46 and the internal gear 47 are in a meshed state, the rectangular sliding block 55 is at the front limit position, and the second abutting rod 60 is at the left limit position.

During normal use, when the metal pins of the plug are completely inserted into the shell 11, the plug pushes the push rod 28 leftwards, then the first slide block 27 slides leftwards and pushes the first abutting rod 32 to slide downwards by abutting against the inclined surface of the first abutting rod 32, the first abutting rod 32 slides downwards by pulling the fixture block 23 downwards through the pull wire 25, so that the upper end of the fixture block 23 is separated from the clamping groove 21, the slide plate 17 slides rightwards quickly under the action of the first spring 19, then the left end of the insulating sleeve 20 is separated from the spring pieces 14, and the metal pins of the plug are in contact with the spring pieces 14 to be electrified.

When a person manually pulls out the plug, the first pressure sensor 29 senses that the plug leaves and starts the motor 58, or when the power supply needs to be cut off in a thunderstorm day, the second pressure sensor 73 is pressed to start the motor 58, meanwhile, the first sliding block 27 slides rightwards under the action of the third spring 30 and returns to the initial state, the upper end of the clamping block 23 extends out of the clamping block cavity 22 under the action of the second spring 24, the motor 58 starts to drive the screw 59 to rotate, the second abutting rod 60 slides rightwards through threaded connection, when the second abutting rod 60 slides rightwards, the third gear 63 and the fourth rotating shaft 62 are driven to rotate through the second tooth space 61, then the worm wheel 64 drives the worm 66 and the fifth rotating shaft 65 to rotate, further the sixth rotating shaft 69 is driven to rotate through belt transmission, further the third rotating shaft 52 is driven to rotate through the turntable 53, the third rotating shaft 52 drives the first cap 49 to rotate through the rectangular sliding block 55 and applies a torsional force to the three, the right end of the second abutting rod 60 is inserted into the abutting groove 56 and pushes the fourth slider 42 to slide backwards, so that the third slider 40 slides backwards along with the fourth slider 42, when the fourth slider 42 slides backwards to a rear limit position, the second gear 46 is disengaged from the inner gear 47 and engaged with the gear groove 38, so that the gear groove 38 drives the second gear 46 and the first gear 37 to rotate under the action of the torsion spring 50, then the first gear 37 drives the second slider 34 to slide leftwards, so that the sliding plate 17 slides leftwards to return to an initial state, when the sliding plate 17 slides leftwards to a left limit position, the upper end of the fixture block 23 extends into the fixture groove 21 again to return to the initial state, and at the moment, the left end of the insulating sleeve 20 extends into the space between the spring pieces 14 to isolate the contact between the metal pin and the spring piece 14.

After the sliding plate 17 is reset, the motor 58 rotates reversely to drive the second abutting rod 60 to slide to the left limit position, the fourth sliding block 42 slides forward to return to the initial state under the action of the fourth spring 43, the third sliding block 40 slides forward, and the second gear 46 is disengaged from the gear groove 38 and is engaged with the inner gear 47 again to be clamped.

In the above manner, a person skilled in the art can make various changes depending on the operation mode within the scope of the present invention.

Claims

1. The utility model provides a socket with protect function with electrical apparatus plug, includes the casing, be equipped with on the casing and participate in protection device, its characterized in that: the pin protection device comprises a contact cavity arranged in the shell, the right wall of the contact cavity is communicated with a jack with a right opening, a reed is fixedly arranged on the left wall of the contact cavity and on the left side of the jack, a sliding plate is arranged in the contact cavity and between the jack and the reed, an insulating sleeve is arranged on the sliding plate and penetrates left and right between the jack and the reed, the left end of the insulating sleeve can be inserted between the reeds, a metal pin of a plug can penetrate through the jack and the insulating sleeve at the corresponding position, a trigger device is arranged in the pin protection device, the trigger device comprises a first slider cavity arranged in the right end face of the shell and between the three jacks, a first slider is arranged in the first slider cavity in a left-right sliding manner, a push rod with the right end extending outwards is fixedly arranged on the right end face of the first slider, and a first pressure sensor is fixedly arranged in the right end face of the push rod, a second pressure sensor is fixedly arranged in the right end face of the shell, a third spring is fixedly connected between the first sliding block and the inner wall of the first sliding block cavity, when a metal pin of a plug is completely inserted into the socket, the plug can push the push rod to the left, a reset device is arranged below the pin protection device, the reset device comprises a second sliding block cavity communicated with the lower wall of the contact cavity, a second sliding block is arranged in the second sliding block cavity and can slide left and right, the lower end of the sliding plate is fixedly connected to the upper end face of the second sliding block, a first tooth groove is formed in the lower end face of the second sliding block, a gear cavity is communicated with the lower wall of the second sliding block cavity, a first gear meshed with the first tooth groove is rotatably arranged on the rear wall of the gear cavity, and a gear groove with a forward opening is formed in the front end; the pin protection device comprises a limiting rod fixedly arranged at the vertically symmetrical position of the right wall of the contact cavity, a first end cap is fixedly arranged at the left end of the limiting rod, two limiting holes are arranged on the upper side and the lower side of the sliding plate and are communicated with the limiting rod at the same height position, the sliding plate is connected to the limiting rod in a left-right sliding mode through the limiting holes, and a first spring is fixedly connected between the sliding plate and the first end cap; the trigger device comprises a clamping groove communicated with the upper wall of the limiting hole arranged on the lower side, a clamping block cavity with an upward opening is arranged on the upper end face of the limiting rod arranged on the lower side, a clamping block with an upper end capable of extending into the clamping groove is arranged in the clamping block cavity in a vertically sliding manner, a second spring is fixedly connected between the clamping block and the inner wall of the clamping block cavity, a pull wire is fixedly arranged at the lower end of the clamping block, a first abutting rod cavity is communicated with the lower wall of the first sliding block cavity, a first abutting rod with an upper end capable of extending into the first sliding block cavity is arranged in the first abutting rod cavity in a vertically sliding manner, and one end of the pull wire penetrates through the left wall of the first abutting rod cavity and is fixedly connected; the reset device comprises a third slide block cavity communicated with the front wall of the gear cavity, two third slide blocks are arranged in the third slide block cavity in a front-back sliding manner, a fourth slide block cavity is communicated with the left wall of the third slide block cavity, a fourth slide block is arranged in the fourth slide block cavity in a front-back sliding manner, the left end of the third slide block is fixedly connected to the right end face of the fourth slide block, and a fourth spring is fixedly connected between the fourth slide block and the inner wall of the fourth slide block cavity; a first rotating shaft penetrates through the third sliding block at the rear side from front to back and is rotatably arranged, a second end cap is fixedly arranged at the front end of the first rotating shaft between the third sliding blocks, a second gear is fixedly arranged at the rear end of the first rotating shaft, an internal gear is fixedly arranged at the rear side of the cavity side wall of the third sliding block, the second gear can be meshed with the internal gear, a second rotating shaft penetrates through the third sliding block at the front side from front to back and is rotatably arranged, a third end cap is fixedly arranged at the rear end of the second rotating shaft between the third sliding blocks, and a torsion spring is fixedly connected between the second rotating shaft and the third end cap; a rotary disc cavity is arranged in the front wall of the third slide block cavity, a third rotary shaft is rotatably arranged in the rear wall of the rotary disc cavity, a rotary disc is fixedly arranged at the front end of the third rotary shaft, the rear end of the rotary disc extends into the third slide block cavity and is provided with a fifth slide block cavity with a backward opening, a rectangular slide block is arranged in the fifth slide block cavity in a front-back sliding manner, and the front end of the second rotary shaft extends into the fifth slide block cavity and is fixedly connected to the rear end face of the rectangular slide block; a left end face of the fourth sliding block is provided with a butting groove with a leftward opening, a left wall of a cavity of the fourth sliding block is communicated with a second butting rod cavity, a motor is fixedly arranged in the left wall of the second butting rod cavity, the right end of the motor is in power connection with a screw rod, a second butting rod which is in threaded connection with the screw rod and can slide left and right in the second butting rod cavity is arranged, a second tooth groove is formed in the front end face of the second butting rod, and the right end of the second butting rod can extend into an inclined plane in the butting groove to butt against and push the fourth sliding block to slide backwards; the front wall of the second butting rod cavity is communicated with a worm gear cavity, a fourth rotating shaft is rotatably arranged between the upper wall and the lower wall of the worm gear cavity, a third gear meshed with the second tooth groove is fixedly arranged on the fourth rotating shaft, a worm wheel is fixedly arranged on the fourth rotating shaft and above the third gear, a fifth rotating shaft is rotatably arranged in the front wall of the worm wheel cavity, a worm meshed with the worm wheel is fixedly arranged at the rear end of the fifth rotating shaft, the left wall of the turntable cavity is communicated with a transmission cavity, the front end of the fifth rotating shaft extends into the transmission cavity and is fixedly provided with a first belt wheel, a sixth rotating shaft with the rear end fixedly connected with the center of the front end surface of the turntable is rotatably arranged in the front wall of the turntable cavity, and a second belt wheel is fixedly arranged on the sixth rotating shaft and on the right side of the first belt wheel, and a transmission belt is wound between the first belt wheel and the second belt wheel.