CN213872352U - Spotlight rotary drum for take-up reel - Google Patents

Abstract

The utility model discloses a shot-light rotary drum for take-up reel, it installs socket module and LED shot-light respectively in the front, on the rotary drum of back, separately installs the plug and can not dazzling, convenient dismantlement. A spot light rotary drum for a winding roll comprises a front rotary drum and a rear rotary drum, wherein the front rotary drum and the rear rotary drum are spliced together at the same axis; the front rotary drum comprises a first annular plate, a first cylindrical shell protrudes from the middle of the first annular plate, and a plurality of first screw columns protrude from the interior of the first cylindrical shell; the rear rotating drum comprises a second annular plate, a second cylindrical shell protrudes from the middle of the second annular plate, and a second screw column corresponding to the first screw column protrudes from the inner part of the second cylindrical shell; the first screw column and the second screw column are spliced and fixed by penetrating through a screw; the first cylindrical shell is provided with a socket module, and the socket module penetrates through the screw to be connected with the first screw column; an LED spotlight is arranged on the second cylindrical shell, and the shell of the LED spotlight is embedded into the second cylindrical shell.

Description

Spotlight rotary drum for take-up reel

Technical Field

The utility model belongs to the technical field of the take-up reel, specifically speaking relate to a shot-light rotary drum for take-up reel.

Background

The winding roll usually provides a power extension function for people when using indoor and outdoor electric appliances, wherein people often use the winding roll in outdoor electric operation, and the outdoor light environment is often not controlled. The dim environment often causes great influence to the electrical operation, even causes the incident, causes very big harm to personal and property safety. The utility model provides a novel projecting lamp of application number CN201821672402.6 and the take-up reel that has the illumination function of application number CN201720869787.4, through a take-up reel of illumination function, can provide stable, bright illumination function when providing power extension function to safe and reliable, it is convenient to use, provide good illuminating effect and safety guarantee for people carry out electrical operation in the relatively poor indoor outer environment of light.

However, the existing lamp using the winding roll for illumination is inconvenient to disassemble, such as the two patent products mentioned above; or the socket and the lighting lamp are positioned on the same side, so that the bright light is dazzling, and the normal plugging and unplugging of the plug of people are influenced.

Disclosure of Invention

The utility model aims at providing a shot-light rotary drum for take-up reel, it installs socket module and LED shot-light respectively in the front, on the back rotary drum, separately installs the plug and can not dazzling, convenient dismantlement.

In order to solve the technical problem, the purpose of the utility model is to realize like this:

a spot light rotary drum for a winding roll comprises a front rotary drum and a rear rotary drum, wherein the front rotary drum and the rear rotary drum are spliced together at the same axis; the front rotary drum comprises a first annular plate, a first cylindrical shell protrudes from the middle of the first annular plate, and a plurality of first screw columns protrude from the interior of the first cylindrical shell; the rear rotating drum comprises a second annular plate, a second cylindrical shell protrudes from the middle of the second annular plate, and a second screw column corresponding to the first screw column protrudes from the inner part of the second cylindrical shell; the first screw column and the second screw column are spliced and fixed by penetrating through a screw; the first cylindrical shell is provided with a socket module, and the socket module penetrates through the screw to be connected with the first screw column; an LED spotlight is arranged on the second cylindrical shell, and the shell of the LED spotlight is embedded into the second cylindrical shell.

On the basis of the above scheme and as a preferable scheme of the scheme: the device also comprises a fixed cover; a third through hole is formed in the middle of the fixed cover; the edge of the third through hole is bent downwards to form an annular arc plate, and the annular arc plate is used for jacking and pressing on a shell of the LED spotlight; the back of the fixed cover is protruded with an upright post which is fixedly connected with a second screw post through a screw.

On the basis of the above scheme and as a preferable scheme of the scheme: the utility model also comprises a front bracket, a rear bracket and a handle; the front plate is provided with a front rotary drum, and the rear plate is provided with a rear rotary drum; the front support comprises a front plate, two ends of the bottom edge of the front plate protrude out of first connecting columns, one end of the top edge of the front plate protrudes out of a second connecting column, and the other end of the top edge of the front plate protrudes out of a third connecting column; the rear support comprises a rear plate, the two ends of the bottom edge of the rear plate are protruded with fourth connecting columns corresponding to the first connecting columns, and screws are inserted into the first connecting columns and fixedly connected with the fourth connecting columns; a fifth connecting column opposite to the second connecting column is protruded from one end of the top edge of the rear plate, and a screw is inserted into the second connecting column and is fixedly connected with the fifth connecting column; a sixth connecting column corresponding to the third connecting column protrudes from the other end of the top edge of the rear plate; the third connecting column and the sixth connecting column are spliced to form a handle; the handle is sleeved on the third connecting column; the handle includes hollow cylinder, and cylinder one end is connected with the crotch, and the crotch is established between fore-stock and after-poppet.

On the basis of the above scheme and as a preferable scheme of the scheme: first hollow support legs protrude from the periphery of the first connecting column on the front plate, and a first reinforcing plate is connected between the two first hollow support legs; the periphery of the fourth connecting column on the rear plate is protruded with second hollow support legs, and a second reinforcing plate is connected between the two second hollow support legs.

On the basis of the above scheme and as a preferable scheme of the scheme: the rotating shaft is inserted into the third connecting column and the sixth connecting column, and two end faces of the rotating shaft are respectively screwed in screws to be fixedly connected with the third connecting column and the sixth connecting column.

On the basis of the above scheme and as a preferable scheme of the scheme: the upper surface of one end of the rotating shaft is provided with sawteeth surrounding the axis, and the sawteeth are embedded into the sixth connecting column.

On the basis of the above scheme and as a preferable scheme of the scheme: the front plate is provided with a first through hole, the front rotary drum is inserted into the first through hole, and the first annular plate is attached to the front plate; the rear plate is provided with a second through hole, the rear rotary drum is inserted into the second through hole, and the second annular plate is attached to the rear plate; the first annular plate is provided with a handle in a protruding way, and the front and the rear rotary drums are driven to rotate by the handle.

On the basis of the above scheme and as a preferable scheme of the scheme: a first annular groove surrounding the first through hole is recessed in the front plate, and a second annular groove surrounding the second through hole is recessed in the rear plate; the edge of the first annular plate is folded with a first flanging, and the first flanging is inserted into the first annular groove; the edge of the second annular plate is turned over with a second flanging, and the second flanging is inserted into the second annular groove.

Compared with the prior art, the utility model outstanding and profitable technological effect is:

compared with the prior art, the spot lamp rotary drum for the winding roll comprises a front rotary drum and a rear rotary drum, wherein the same axle center of the front rotary drum and the rear rotary drum is fixed together by passing through screws through a first screw column and a second screw column, so that the spot lamp rotary drum can be conveniently disassembled and assembled;

the front rotary drum is provided with the socket module through a screw, the rear rotary drum is provided with the LED spotlight, and the socket module and the LED spotlight are arranged in a back-to-back manner, so that the LED spotlight can not be dazzled by bright light when people plug in and plug out the plug;

the LED spotlight is embedded into the rear rotary drum, the fixing cover is arranged on the rear rotary drum, the LED spotlight is further fixed on the rear rotary drum by the fixing cover, and the LED spotlight can be taken down by taking down the fixing cover, so that the LED spotlight is convenient to assemble and disassemble;

different types of sockets can be embedded into the shell of the socket module, and different types of replacement can be realized.

Drawings

Fig. 1 is a schematic diagram of the overall explosion structure of the present invention.

Fig. 2 is a schematic diagram of a partial explosion structure of the present invention.

Fig. 3 is a schematic diagram of a partial explosion structure of the present invention.

Fig. 4 is a schematic view of the present invention in partial section.

Fig. 5 is a schematic sectional structure view of the fixing cover of the present invention.

Fig. 6 is a schematic partial sectional structure of the present invention.

Fig. 7 is a schematic structural view of the fixing cover of the present invention.

Fig. 8 is a schematic structural view of the fixing cover of the present invention.

Fig. 9 is a schematic view of the front bracket structure of the present invention.

Fig. 10 is a schematic view of the front bracket structure of the present invention.

Fig. 11 is a schematic view of the rear bracket structure of the present invention.

Fig. 12 is a schematic view of the rear bracket structure of the present invention.

Fig. 13 is a schematic view of the handle structure of the present invention.

Fig. 14 is a schematic view of the structure of the rotating shaft of the present invention.

Fig. 15 is a schematic structural view of the front rotary drum of the present invention.

Fig. 16 is a schematic structural view of the front rotary drum of the present invention.

Fig. 17 is a schematic structural view of the rear drum of the present invention.

Fig. 18 is a schematic view of the overall structure of the present invention.

Fig. 19 is a schematic view of the overall structure of the present invention.

Fig. 20 is a schematic view of the connection structure of the front and rear brackets of the present invention.

Fig. 21 is a schematic sectional structure view of the front and rear drums of the present invention.

Fig. 22 is a schematic sectional view of the handle of the present invention.

Fig. 23 is a schematic view of a cross-sectional structure of the handle rotating shaft of the present invention.

Fig. 24 is a schematic sectional view of the first connecting post of the present invention.

Reference numerals: a front bracket 01; a front plate 010; a first connecting column 011; a second connection column 012; a third connecting column 013; a first hollow leg 014; a first reinforcing plate 015; a first through hole 016; a first annular groove 017; a rear bracket 02; a rear plate 020; a fourth connecting column 021; a fifth connecting column 022; a sixth connecting column 023; a second hollow leg 024; a second reinforcing plate 025; a second through hole 026; a second annular groove 027; a handle 03; a cylinder 030; a hook 031; a rotating shaft 04; saw teeth 040; a front drum 05; a first ring plate 050; a first cylindrical shell 051; a first stud 052; a grip 053; a first flange 054; a rear drum 06; a second ring plate 060; a second cylindrical shell 061; a second screw post 062; a second turn-up rim 063; a socket module 07; an LED spotlight 08; a fixed cover 09; a third through hole 090; an annular arc plate 091; a column 092;

Detailed Description

The present invention will be further described with reference to the following detailed description;

the embodiment provides a reflector lamp rotary drum for a winding roll, which comprises a front rotary drum and a rear rotary drum, wherein the front rotary drum and the rear rotary drum are spliced together at the same axis; the front rotary drum 05 and the rear rotary drum 06 are made of plastic materials and are spliced together to be used for winding power lines;

the front rotary drum 05 comprises a first ring plate 050, a first cylindrical shell 051 protrudes from the middle of the first ring plate 050, the first cylindrical shell 051 is hollow inside and shell-shaped, the weight is reduced, a plurality of first screw columns 052 protrude from the inside of the first cylindrical shell 051, and screws can be connected to two ends of each first screw column 052;

the rear drum 06 comprises a second ring plate 060, a second cylindrical shell 061 protrudes from the middle of the second ring plate 060, and a second screw post 062 corresponding to the first screw post 052 protrudes from the inside of the second cylindrical shell 061;

as described above, the first cylindrical shell 051 and the second cylindrical shell 061 are spliced together in the front-rear direction, and the screw passes through the first screw column 052 and is fixedly connected with the second screw column 062;

the socket module 07 is arranged on the first cylindrical shell 051, the socket module 07 passes through a screw to be connected with a first screw column 052, the socket module is a wiring board in the prior art, but the improved technology of the utility model is that the shell of the socket module passes through the screw to be fixed on the front rotary drum 05, the socket module can be set into 4 German or Chinese or other types of jacks, or 2 German or Chinese or other types of jacks and 2 USB interfaces, meanwhile, the socket module 07 comprises a power indicator lamp, an overload switch and a socket power switch, and the power supply on-off of the 4 sockets and the USB interfaces can be controlled through the socket power switch;

be equipped with LED shot-light 08 on the second cylindrical shell 061, form chucking fixed connection on LED shot-light 08's the shell embedding second cylindrical shell, LED shot-light 08 also is prior art, the non the utility model discloses an improvement technique.

As described above, the socket module and the lighting module of the LED spotlight are separated into two opposite directions, the LED spotlight plays a lighting role, when the plug is plugged in and pulled out of the socket module, the plug cannot be directly projected by light, so that dazzling is avoided, and meanwhile, the lighting module of the LED spotlight can be used for conveniently observing, thereby achieving two purposes at one time and being more practical;

further, the device also comprises a fixed cover 09, wherein the fixed cover 09 is integrally formed; a third through hole 090 is formed in the middle of the fixing cover 09 and is used for illuminating light rays of the LED spotlight to realize illumination; the edge of the third through hole 090 is bent downwards to form an annular arc plate 091, and the annular arc plate 091 is used for pressing against the shell of the LED spotlight; the back of the fixed cover 09 is protruded with a column 092, the column 092 is hollow, and the column 092 is fixedly connected with a second screw column through a screw.

As described above, the LED spot lamp is embedded in the rear rotary drum, and then the fixed cover 09 is mounted on the LED spot lamp, the annular arc plate 091 of the fixed cover 09 abuts against the housing of the LED spot lamp, and the upright post 092 at the edge of the fixed cover 09 is connected with the second screw post by the screw, so that the LED spot lamp is mounted on the rear rotary drum more firmly and is not easy to fall off;

further, the lifting device comprises a front bracket 01, a rear bracket 02 and a lifting handle 03; the front support 01 and the rear support 02 are spliced together to be used for winding a power line, and the handle 03 is convenient to carry and hang; the front bracket is provided with a front rotary drum, and the rear bracket is provided with a rear rotary drum;

the front support 01 is integrally formed by injection molding of a plastic material, and comprises a front plate 010, wherein two ends of the bottom edge of the front plate 010 protrude out of a first connecting column 011, one end of the top edge of the front plate 010 protrudes out of a second connecting column 012, and the other end of the top edge of the front plate 010 protrudes out of a third connecting column 013; the front plate 010 is provided with a front rotary drum 05, the rear plate 020 is provided with a rear rotary drum 06, and the front rotary drum 05 and the rear rotary drum 06 are spliced together in the same axis;

as described above, the first connection column 011, the second connection column 012, and the third connection column 013 are columnar, have through holes inside, and have protrusions for fixing screws protruded from the inner walls;

the rear bracket 02 is integrally formed by injection molding of a plastic material, the rear bracket 02 comprises a rear plate 020, a fourth connecting column 021 corresponding to the first connecting column 011 protrudes from two ends of the bottom edge of the rear plate 020, and a screw is inserted into the first connecting column 011 and is fixedly connected with the fourth connecting column 021; a fifth connecting column 022 opposite to the second connecting column 012 is protruded from one end of the top edge of the rear plate 020, and a screw is inserted into the second connecting column 012 and is fixedly connected with the fifth connecting column 022; a sixth connecting column 023 corresponding to the third connecting column 013 protrudes from the other end of the top edge of the rear plate 020;

as described above, the fourth connecting column 021, the fifth connecting column 022 and the sixth connecting column 023 are provided with internal threaded holes, and screws pass through the holes; the connecting columns are spliced in pairs in opposite mode, the round hole structures on the same axis of the connecting columns are axially assembled and fixed through screws, and the front support 02 and the rear support 02 are spliced together to form a support;

the third connecting column 013 and the sixth connecting column 023 are spliced to form a handle, and the end parts of the third connecting column 013 and the sixth connecting column 023 are step-shaped and are spliced front and back;

the handle 03 is sleeved on the third connecting column 013, and the handle 03 is integrally formed by injection molding of plastic materials; the handle 03 includes hollow cylinder 030, and cylinder 030 overlaps and establishes on third spliced pole 013, can rotate around third spliced pole 013, and cylinder 030 one end is connected with crotch 031, and crotch 031 establishes between fore-stock 01 and after-poppet 02.

As described above, the front bracket 01 and the rear bracket 02 are spliced together through the connection column as a connection structure, and the third connection column 013 and the sixth connection column 023 are large in size and can be used as handles to lift the whole product; a handle 03 is sleeved on the third connecting column 013, the handle 03 can rotate around the third connecting column 013, when the lifting device is used, the handle 03 is screwed out, the hook 031 on the cylinder 030 can be lifted and hung, when the lifting device is not used, the hook 031 is screwed between the front support 02 and the rear support 02, and space is not occupied;

the front rotary drum 05 and the rear rotary drum 06 respectively penetrate through central circular holes of the front support 01 and the rear support 02, are axially assembled through circular hole structures on the same axis of the front support 01 and the rear support and are fixed through screws;

further, a first hollow leg 014 protrudes from the periphery of the first connection column 011 on the front plate 010, the first hollow leg 014 is hollow and is a conical shell, and a first reinforcing plate 015 is connected between the two first hollow legs 014; a second hollow support leg 024 protrudes from the periphery of the fourth connecting column 021 on the back plate 020, the second hollow support leg 024 is the same as the first hollow support leg 014 in shape, the interior of the second hollow support leg 024 is hollow and is a conical shell, and a second reinforcing plate 025 is connected between the two second hollow support legs 024.

As described above, the front bracket 01 and the rear bracket 02 are spliced together through the connecting column, the first hollow leg 014 and the second hollow leg 024 play a role in supporting and stabilizing the whole product, and the first reinforcing plate 015 and the second reinforcing plate 025 are spliced together in the same structure, so that the strength of the hollow legs is improved;

further, the rotating shaft 04 is made of plastic materials and is in a rod shape, the rotating shaft 04 is inserted into the third connecting column 013 and the sixth connecting column 023, and screws are screwed into two end faces of the rotating shaft 04 to be connected and fixed with the third connecting column 013 and the sixth connecting column 023 respectively.

As described above, the third connecting column 013 and the sixth connecting column 023 are hollow, one half of the rotating shaft 04 is embedded into the third connecting column 013, the other half of the rotating shaft 04 is embedded into the sixth connecting column 023, and two screws respectively penetrate through the third connecting column 013 and the sixth connecting column 023 to be fixedly connected with the rotating shaft 04, so that the strength of the handle is enhanced, and the damage caused by multiple lifting and holding is avoided;

furthermore, the upper surface of one end of the shaft 04 is provided with a sawtooth 040 surrounding the axis, and the sawtooth 040 is embedded in the sixth connecting column 023. As described above, the surface of the rotating shaft 04 is provided with the sawtooth 040 embedded inside the sixth connecting post 023, so that the rotating shaft 04 can follow the rotation of the screw when the screw is locked;

further, a first through hole 016 is formed in the front plate 010, the front rotary drum 05 is inserted into the first through hole 016, and the first annular plate 050 is attached to the front plate 010; a second through hole 026 is formed in the rear plate 020, the rear rotary drum 06 is inserted into the second through hole 026, and the second ring plate 060 is attached to the rear plate 020; the first screw column 052 and the second screw column 062 are spliced and fixed by penetrating through a screw;

as described above, the front rotary cylinder 05 can rotate along the circular hole center axis of the first through hole 016 on the front bracket 01, and is limited by the front bracket 01 to move in the radial direction and the axial direction; one end of the power line comprises a plug matched with the socket, the other end of the power line penetrates through the threading hole of the front rotary drum 05 to be electrically connected with the socket module, and all the power lines are wound on the drum surface of the rotary drum and roll along with the rotary drum to be collected or released.

A handle 053 protrudes out of the first annular plate 050, and the handle 053 drives the first annular plate to rotate back and forth. As described above, the edge of the end face of the outer circle of the front rotary drum 05 is provided with the handle 053, the handle 053 is columnar, and the front rotary drum 06 and the rear rotary drum 06 are driven to rotate along the central axis of the hole of the front bracket 02 and the rear bracket 02 by the handle 053;

further, a first annular groove 017 surrounding the first through hole 016 is recessed in the front plate 010, and a second annular groove 027 surrounding the second through hole 026 is recessed in the rear plate 020; a first flange 054 is folded at the edge of the first ring plate 050, and the first flange 054 is inserted into the first annular groove 017; the edge of the second ring plate 060 is turned over with a second turn-up 063, which second turn-up 063 is inserted into the second annular groove 027.

As described above, the front rotary drum 05 is limited on the front bracket 01 by the first annular groove 017 and the first flange 054, and the front rotary drum 05 is limited on the rear bracket 02 by the second annular groove 027 and the second flange 063, which can facilitate the rotation.

The utility model discloses a take-up reel of LED shot-light illumination function can provide stable, bright illumination function when providing power extension function to safe and reliable, it is convenient to use, provides good illuminating effect and safety guarantee for people carry out electrical operation in the relatively poor indoor outer environment of light.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like refer to the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, or the orientation or position relationship that one skilled in the art conventionally understands, and are only for convenience of describing the present invention and simplifying the description, but do not refer to or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. A spot light rotary drum for take-up reel, its characterized in that: the rotary drum comprises a front rotary drum and a rear rotary drum which are spliced together at the same axis;

the front rotary drum comprises a first annular plate, a first cylindrical shell protrudes from the middle of the first annular plate, and a plurality of first screw columns protrude from the interior of the first cylindrical shell;

the rear rotating drum comprises a second annular plate, a second cylindrical shell protrudes from the middle of the second annular plate, and a second screw column corresponding to the first screw column protrudes from the inner part of the second cylindrical shell; the first screw column and the second screw column are spliced and fixed by penetrating through a screw;

the first cylindrical shell is provided with a socket module, and the socket module penetrates through the screw to be connected with the first screw column; an LED spotlight is arranged on the second cylindrical shell, and the shell of the LED spotlight is embedded into the second cylindrical shell.

2. The lamp drum for a take-up reel as claimed in claim 1, wherein: the device also comprises a fixed cover; a third through hole is formed in the middle of the fixed cover; the edge of the third through hole is bent downwards to form an annular arc plate, and the annular arc plate is used for jacking and pressing on a shell of the LED spotlight; the back of the fixed cover is protruded with an upright post which is fixedly connected with a second screw post through a screw.

3. The lamp drum for a take-up reel as claimed in claim 1, wherein: the utility model also comprises a front bracket, a rear bracket and a handle; the front bracket is provided with a front rotary drum, and the rear bracket is provided with a rear rotary drum;

the front support comprises a front plate, two ends of the bottom edge of the front plate protrude out of first connecting columns, one end of the top edge of the front plate protrudes out of a second connecting column, and the other end of the top edge of the front plate protrudes out of a third connecting column;

the rear support comprises a rear plate, the two ends of the bottom edge of the rear plate are protruded with fourth connecting columns corresponding to the first connecting columns, and screws are inserted into the first connecting columns and fixedly connected with the fourth connecting columns; a fifth connecting column opposite to the second connecting column is protruded from one end of the top edge of the rear plate, and a screw is inserted into the second connecting column and is fixedly connected with the fifth connecting column; a sixth connecting column corresponding to the third connecting column protrudes from the other end of the top edge of the rear plate;

the third connecting column and the sixth connecting column are spliced to form a handle; the handle is sleeved on the third connecting column; the handle includes hollow cylinder, and cylinder one end is connected with the crotch, and the crotch is established between fore-stock and after-poppet.

4. A reflector lamp drum for a winding roll according to claim 3, wherein: first hollow support legs protrude from the periphery of the first connecting column on the front plate, and a first reinforcing plate is connected between the two first hollow support legs;

the periphery of the fourth connecting column on the rear plate is protruded with second hollow support legs, and a second reinforcing plate is connected between the two second hollow support legs.

5. A reflector lamp drum for a winding roll according to claim 3, wherein: the rotating shaft is inserted into the third connecting column and the sixth connecting column, and two end faces of the rotating shaft are respectively screwed in screws to be fixedly connected with the third connecting column and the sixth connecting column.

6. A reflector lamp drum for a winding roll according to claim 5, wherein: the upper surface of one end of the rotating shaft is provided with sawteeth surrounding the axis, and the sawteeth are embedded into the sixth connecting column.

7. A reflector lamp drum for a winding roll according to claim 3, wherein: the front plate is provided with a first through hole, the front rotary drum is inserted into the first through hole, and the first annular plate is attached to the front plate; the rear plate is provided with a second through hole, the rear rotary drum is inserted into the second through hole, and the second annular plate is attached to the rear plate; the first annular plate is provided with a handle in a protruding way, and the front and the rear rotary drums are driven to rotate by the handle.

8. The lamp drum for a take-up reel as claimed in claim 7, wherein: a first annular groove surrounding the first through hole is recessed in the front plate, and a second annular groove surrounding the second through hole is recessed in the rear plate;

the edge of the first annular plate is folded with a first flanging, and the first flanging is inserted into the first annular groove; the edge of the second annular plate is turned over with a second flanging, and the second flanging is inserted into the second annular groove.

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