CN221294670U

CN221294670U - Plastic barrel easy to uncover

Info

Publication number: CN221294670U
Application number: CN202323376891.4U
Authority: CN
Inventors: 王荣; 王琪
Original assignee: Anhui Ruitu Communication Equipment Co ltd
Current assignee: Anhui Ruitu Communication Equipment Co ltd
Priority date: 2023-12-11
Filing date: 2023-12-11
Publication date: 2024-07-09
Anticipated expiration: 2033-12-11

Abstract

The utility model provides a plastic bucket easy to open, which comprises a bucket body, wherein one end of the top of the bucket body is provided with a groove, an opening communicated with the inside of the groove is formed in the bucket body, and a material guide pipe communicated with the opening is integrally formed in the groove at the top of the bucket body; the barrel body is located in the groove and is hinged with the cover plate, the cover plate is provided with the accommodating cavity, the cover plate is located in the accommodating cavity and movably penetrates through the sealing block, and when the cover plate is attached to the top of the material guiding pipe, one end of the sealing block penetrating through the accommodating cavity can extend into the material guiding pipe. According to the utility model, the installation mode of threaded connection of the plastic barrel cover and the plastic barrel is replaced by arranging the material guide pipe, the plugging block, the cover plate, the driving mechanism and the clamping mechanism, so that the situation that the original fastening characteristic is lost due to abrasion and deformation of threads when the plastic barrel cover is frequently screwed down to ensure the sealing performance in the long-term use process of the plastic barrel is effectively avoided, the service life of the plastic barrel is prolonged, and the mode of screwing the plastic barrel cover is replaced.

Description

Plastic barrel easy to uncover

Technical Field

The utility model relates to the technical field of plastic barrels, in particular to a plastic barrel easy to open.

Background

The plastic barrel is hollow and is used for accommodating liquid and solid objects; the top of plastic drum is equipped with the bung that is linked together rather than inside, is equipped with the bung that is used for carrying out the shutoff to the bung on the plastic drum, seals up to the bung in order to realize the sealed operation of plastic drum bung through the bung, is mostly connected through threaded connection's mode between current bung and the plastic drum, and bung screw thread is installed on the plastic drum to realize the sealed effect to the plastic drum bung, this kind of connected mode is though can be effectual to the plastic drum bung seal, but in the in-service use, still has following defect:

In the long-term use process of the plastic barrel caused by threaded connection of the barrel cover and the plastic barrel, frequent screwing is usually required to ensure the sealing performance, the threads are easy to abrade and deform due to frequent opening and closing of the connection, the original fastening characteristic is lost, the service life of the plastic barrel is shortened, and the barrel cover is required to be screwed when the barrel opening is opened or plugged, so that the problem is solved;

Therefore, the application provides the plastic bucket which is easy to open.

Disclosure of utility model

Aiming at the defects of the prior art, the utility model provides a plastic bucket easy to open the cover, and solves the problems in the background art.

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

A plastic barrel easy to uncover comprises a barrel body, wherein one end of the top of the barrel body is provided with a groove, an opening communicated with the inside of the groove is formed in the barrel body, and a material guide pipe communicated with the opening is integrally formed in the groove at the top of the barrel body;

The barrel body is hinged with a cover plate in the groove, the cover plate is provided with a containing cavity, a plugging block movably penetrates through the containing cavity, when the cover plate is attached to the top of the material guiding pipe, one end of the plugging block penetrating through the containing cavity can extend into the material guiding pipe, and the plugging block is attached to the inner wall of the material guiding pipe;

The plugging block is internally provided with a mounting cavity, a clamping mechanism is arranged on the plugging block and positioned in the mounting cavity, and when the plugging block is positioned in the material guiding pipe, the plugging block is clamped with the material guiding pipe through the clamping mechanism;

The cover plate is provided with a driving mechanism connected with the clamping mechanism, and the driving mechanism is used for driving the clamping mechanism to act so as to form the clamping connection between the plugging block and the material guiding pipe or cancel the clamping connection.

Further: the clamping mechanism comprises:

the guide column is in a vertical direction and is fixed in the mounting cavity, and a loop bar is movably sleeved outside the guide column;

The clamping plates are two in number, the clamping holes are symmetrically formed in the two sides of the loop bar, the inner side wall of the guide pipe is symmetrically provided with clamping holes, the two clamping plates respectively penetrate through the two sides of the plugging block in a movable mode, one end of each clamping plate penetrating through the plugging block can be inserted into the corresponding clamping hole and is clamped with the corresponding clamping hole, the two sides of the loop bar are hinged with hinging bars, the other ends of the two hinging bars are respectively clamped with the two clamping plates, the driving mechanism is connected with the loop bar, and the driving mechanism is used for enabling the loop bar to slide along the guide column.

Further: the driving mechanism comprises a pull rod which movably penetrates through the cover plate and the plugging block, one end of the pull rod extends into the mounting cavity and is fixedly connected with the sleeve rod, and a first spring sleeved outside the pull rod is arranged between the sleeve rod and the inner top wall of the mounting cavity.

Further: and a second spring sleeved outside the pull rod is arranged in the accommodating cavity, and two ends of the second spring are respectively connected with the plugging block and the inner top wall of the accommodating cavity.

Further: the annular mounting groove is formed in the outer side wall of the plugging block, the annular sealing gasket which is clamped with the plugging block is inserted into the annular mounting groove, and when the plugging block is located in the material guiding pipe, the annular sealing gasket is abutted to the inner side wall of the material guiding pipe.

Further: the cover plate is hinged on the inner side wall of the groove, and a driving piece acting on the cover plate is arranged on the barrel body and used for enabling the cover plate to rotate on the barrel body so as to enable the cover plate to be far away from the material guide pipe.

Further: the driving part comprises a fixed shaft fixed on the inner side wall of the groove, the cover plate is sleeved outside the fixed shaft and hinged with the barrel body, a coil spring is sleeved outside the fixed shaft, and two ends of the coil spring are fixedly connected with the fixed shaft and the cover plate respectively.

Further: u-shaped groove has been seted up to one side that just is located the recess at staving top, just is located U-shaped inslot and is fixed with the handle on the staving, and staving bottom symmetry is fixed with the support bar, and the spacing groove has been seted up to staving top and be located the recess outside symmetry, and two support bars can hide respectively to two spacing inslot.

The utility model provides a plastic bucket easy to open. Compared with the prior art, the method has the following beneficial effects:

Through setting up passage, shutoff piece, apron, drive mechanism and joint mechanism, replace bung and plastic drum threaded connection's mounting means to in the effectual plastic drum of avoiding long-term use, when frequently screwing up the bung in order to ensure sealing performance, lead to the wearing and tearing of screw thread, deformation cause the condition of losing original fastening characteristic, thereby extension plastic drum's life, and replace the mode of twisting the bung, facilitate the use.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic perspective view of the present utility model;

FIG. 2 shows a schematic view of the mounting structure of the actuator of the present utility model;

FIG. 3 shows an enlarged view of the utility model at A in FIG. 2;

FIG. 4 shows another perspective view of the present utility model;

FIG. 5 shows an enlarged view of the utility model at B in FIG. 4;

The figure shows: 1. a tub body; 11. a groove; 12. an opening; 13. a material guiding pipe; 131. a clamping hole; 14. a U-shaped groove; 15. a handle; 16. a support bar; 17. a limit groove; 2. a cover plate; 21. a receiving chamber; 3. a block; 31. a mounting cavity; 32. an annular mounting groove; 33. an annular gasket; 4. a clamping mechanism; 41. a guide post; 42. a loop bar; 43. a clamping plate; 44. a hinge rod; 5. a drive mechanism; 51. a pull rod; 52. a first spring; 6. a second spring; 7. a driving member; 71. a fixed shaft; 72. a coil spring.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

In order to solve the technical problems in the background technology, a plastic bucket easy to open is provided as follows:

Referring to fig. 1-5, the plastic bucket easy to open comprises a bucket body 1, wherein a groove 11 is arranged at one end of the top of the bucket body 1, an opening 12 communicated with the inside of the groove 11 is formed in the bucket body 1, and a material guiding pipe 13 communicated with the opening 12 is integrally formed in the groove 11 at the top of the bucket body 1; the barrel body 1 is hinged with a cover plate 2 in the groove 11, the cover plate 2 is provided with a containing cavity 21, a blocking block 3 movably penetrates through the cover plate 2 and is positioned in the containing cavity 21, when the cover plate 2 is attached to the top of the material guiding pipe 13, one end of the blocking block 3 penetrating through the containing cavity 21 can extend into the material guiding pipe 13, and the blocking block 3 is attached to the inner wall of the material guiding pipe 13; the plugging block 3 is internally provided with a mounting cavity 31, the plugging block 3 is provided with a clamping mechanism 4 positioned in the mounting cavity 31, and when the plugging block 3 is positioned in the material guiding pipe 13, the plugging block 3 is clamped with the material guiding pipe 13 through the clamping mechanism 4; the cover plate 2 is provided with a driving mechanism 5 connected with the clamping mechanism 4, which is used for driving the clamping mechanism 4 to act so as to form the clamping or the cancellation of the clamping of the plugging block 3 and the material guiding pipe 13.

During the use, when the opening 12 is plugged, make the shutoff piece 3 hide to hold in the chamber 21, apply effort to apron 2, make it rotate on staving 1 and the laminating of guide pipe 13, make the shutoff piece 3 insert and establish to in the guide pipe 13, drive joint mechanism 4 action through driving mechanism 5, make shutoff piece 3 and guide pipe 13 joint, fix between shutoff piece 3 and the guide pipe 13, the shutoff piece 3 is laminated with guide pipe 13 inner wall, can be through shutoff piece 3 to the inside shutoff of guide pipe 13, realize the shutoff to opening 12, when cancelling the shutoff to opening 12, drive joint mechanism 4 action through driving mechanism 5, cancel the joint state between shutoff piece 3 and the guide pipe 13, make shutoff piece 3 hide to hold in the chamber 21, can make apron 2 rotate on staving 1, make apron 2 keep away from guide pipe 13, can cancel the shutoff to guide pipe 13, replace the installation mode of plastic drum threaded connection, in the effectual plastic drum long-term use, when screwing up in order to ensure sealing performance, lead to the screw thread causes, the fastening characteristic of plastic drum is lost, thereby the life-span of life of the bung is convenient for use, and the bung is lost.

Example two

As shown in fig. 1 to 5, on the basis of the above embodiment, the present embodiment further provides the following:

In this embodiment, the clamping mechanism 4 includes: the guide column 41 is in a vertical direction and is fixed in the mounting cavity 31, and a loop bar 42 is movably sleeved outside the guide column 41; the clamping plates 43 are two in number, the clamping holes 131 are symmetrically formed in the two sides of the loop bar 42 and symmetrically arranged on the inner side wall of the guide pipe 13, the two clamping plates 43 respectively penetrate through the two sides of the plugging block 3 in a movable mode, one end of each clamping plate 43 penetrating through the plugging block 3 can be inserted into each clamping hole 131 and is clamped with the corresponding clamping plate, two sides of the loop bar 42 are hinged with hinge bars 44, the other ends of the two hinge bars 44 are respectively clamped with the two clamping plates 43, the driving mechanism 5 is connected with the loop bar 42, and the driving mechanism 5 is used for enabling the loop bar 42 to slide along the guide column 41.

When the sealing device is used, when the opening 12 is sealed, the sleeve rod 42 slides along the guide column 41 towards the cover plate 2 through the driving mechanism 5, the two hinging rods 44 rotate on the sleeve rod 42 around hinging points of the two hinging rods, the other ends of the two hinging rods 44 rotate with the two clamping plates 43 respectively, the end parts of the two clamping plates 43 slide towards the inside of the sealing block 3, the sealing block 3 is inserted into the guide pipe 13, the sleeve rod 42 slides along the guide column 41 towards the direction far away from the cover plate 2 through the driving mechanism 5, the end parts of the two clamping plates 43 penetrate through the two sides of the sealing block 3 respectively and are inserted into the two clamping holes 131, the clamping plates 43 are clamped with the guide pipe 13, and the sealing block 3 and the guide pipe 13 are clamped, otherwise, when the sealing of the opening 12 is canceled, the end parts of the two clamping plates 43 slide towards the inside of the sealing block 3 through the driving mechanism 5, and the clamping connection between the sealing block 3 and the guide pipe 13 is canceled.

In this embodiment, the driving mechanism 5 includes a pull rod 51 movably penetrating through the cover plate 2 and the plugging block 3, one end of the pull rod 51 extends into the mounting cavity 31 and is fixedly connected with the sleeve rod 42, and a first spring 52 sleeved outside the pull rod 51 is installed between the sleeve rod 42 and the inner top wall of the mounting cavity 31.

When the telescopic rod is used, acting force is applied to the pull rod 51, so that the pull rod 51 slides out of the accommodating cavity 21, the sleeve rod 42 can slide along the guide column 41 towards the cover plate 2, the first spring 52 is stressed to deform, and when the acting force to the pull rod 51 is cancelled, the first spring 52 is restored to a natural state, so that the sleeve rod 42 can be pushed to slide along the guide column 41 towards the direction away from the cover plate 2, and the telescopic rod is convenient to use; and the pull rod 51 is pulled to enable the sleeve rod 42 to slide along the guide post 41 towards the cover plate 2, so that after the end parts of the two clamping plates 43 slide into the plugging block 3, the plugging block 3 can slide towards the accommodating cavity 21 and be hidden into the accommodating cavity 21 by continuously pulling the pull rod 51, and multiple purposes are achieved.

In this embodiment, the accommodating cavity 21 is internally provided with a second spring 6 sleeved outside the pull rod 51, and two ends of the second spring 6 are respectively connected with the plugging block 3 and the inner top wall of the accommodating cavity 21.

Pulling the pull rod 51 makes the loop bar 42 slide along the guide post 41 towards the cover plate 2, and after the end parts of the two clamping plates 43 slide into the plugging block 3, continuously pulling the pull rod 51 makes the plugging block 3 slide towards the accommodating cavity 21 and hide in the accommodating cavity 21, the second spring 6 is stressed to deform, the acting force on the pull rod 51 is cancelled, the second spring 6 is restored to a natural state, and the plugging block 3 can be pushed to slide towards the outer part of the accommodating cavity 21, so that the use is convenient.

Example III

in this embodiment, the outer side wall of the plugging block 3 is provided with an annular mounting groove 32, an annular sealing pad 33 clamped with the plugging block 3 is inserted into the annular mounting groove 32, the annular sealing pad 33 is made of rubber pad, and when the plugging block 3 is located in the material guiding pipe 13, the annular sealing pad 33 is abutted against the inner side wall of the material guiding pipe 13.

By means of the design of the annular sealing gasket 33, when the sealing block 3 is located in the material guiding pipe 13, the annular sealing gasket 33 is abutted against the inner side wall of the material guiding pipe 13, the fit between the sealing block 3 and the material guiding pipe 13 is increased, the tightness between the sealing block 3 and the material guiding pipe 13 is increased, and the sealing effect on the opening 12 is improved.

In this embodiment, the cover plate 2 is hinged on the inner side wall of the groove 11, and the barrel body 1 is provided with an actuating member 7 acting on the cover plate 2, which is used for rotating the cover plate 2 on the barrel body 1 so as to enable the cover plate 2 to be far away from the material guiding pipe 13; the driving member 7 comprises a fixed shaft 71 fixed on the inner side wall of the groove 11, the cover plate 2 is sleeved outside the fixed shaft 71 and hinged with the barrel body 1, a coil spring 72 is sleeved outside the fixed shaft 71, and two ends of the coil spring 72 are fixedly connected with the fixed shaft 71 and the cover plate 2 respectively.

Through the design of driving piece 7, during the use, when making apron 2 and the laminating of guide pipe 13, coil spring 72 atress takes place deformation, pulls pull rod 51, makes shutoff piece 3 hide to holding in the chamber 21, when canceling to seal guide pipe 13, coil spring 72 resumes natural state, makes apron 2 rotate on staving 1, and apron 2 is kept away from guide pipe 13 to keep canceling to seal the state to guide pipe 13.

In this embodiment, the U-shaped groove 14 is formed at the top of the barrel 1 and located at one side of the groove 11, the handle 15 is fixed in the U-shaped groove 14 on the barrel 1, the supporting bars 16 are symmetrically fixed at the bottom of the barrel 1, the limiting grooves 17 are symmetrically formed at the top of the barrel 1 and located at the outer side of the groove 11, and the two supporting bars 16 can be respectively hidden into the two limiting grooves 17.

Through setting up handle 15, be convenient for draw staving 1, through the design of support bar 16 and spacing groove 17, two support bars 16 can hide respectively to two spacing grooves 17 in, stacks two adjacent staving 1, makes two support bars 16 that are located staving 1 bottom of top insert respectively to be located in two spacing grooves 17 at staving 1 top of below, can realize spacing between two adjacent staving 1 that stack, is convenient for stack staving 1.

The working principle and the using flow of the utility model are as follows:

When in use, the utility model is characterized in that:

When the opening 12 is plugged, the pull rod 51 is pulled, the sleeve rod 42 slides along the guide post 41 towards the cover plate 2, after the end parts of the two clamping plates 43 slide into the plugging block 3, the pull rod 51 is continuously pulled, the plugging block 3 slides towards the two sides of the plugging block 3 and is hidden into the accommodating cavity 21, the spring II 6 is stressed to deform, the acting force is applied to the cover plate 2, the cover plate 2 rotates on the barrel body 1 to be attached to the material guide pipe 13, the acting force on the pull rod 51 is eliminated, the spring II 6 is restored to a natural state, the plugging block 3 can be pushed to slide towards the outside of the accommodating cavity 21, the plugging block 3 is inserted into the material guide pipe 13, the spring I52 is restored to a natural state, the sleeve rod 42 can slide along the guide post 41 towards the direction away from the cover plate 2, the end parts of the two clamping plates 43 respectively penetrate through two sides of the plugging block 3 and are inserted into the two clamping holes 131, the clamping plate 43 and the material guide pipe 13 are clamped, and the opening 12 can be plugged between the plugging block 3 and the material guide pipe 13;

When the opening 12 is not blocked, the pull rod 51 is pulled to enable the sleeve rod 42 to slide along the guide post 41 towards the cover plate 2, after the end parts of the two clamping plates 43 slide into the blocking block 3, the pull rod 51 is continuously pulled to enable the blocking block 3 to slide towards the accommodating cavity 21 and be hidden in the accommodating cavity 21, the coil spring 72 is restored to a natural state, the cover plate 2 rotates on the barrel body 1, the cover plate 2 is far away from the guide pipe 13, so that the blocking state of the guide pipe 13 is kept cancelled, and the blocking state of the opening 12 is cancelled;

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A plastic drum of easily uncapping, its characterized in that: the novel energy-saving water heater comprises a barrel body (1), wherein a groove (11) is arranged at one end of the top of the barrel body (1), an opening (12) communicated with the inside of the groove is formed in the barrel body (1) and positioned in the groove (11), and a material guide pipe (13) communicated with the opening (12) is integrally formed at the top of the barrel body (1) and positioned in the groove (11);

The barrel body (1) is hinged with a cover plate (2) in the groove (11), the cover plate (2) is provided with a containing cavity (21), the cover plate (2) is movably penetrated with a blocking block (3) in the containing cavity (21), when the cover plate (2) is attached to the top of the material guiding pipe (13), one end of the blocking block (3) penetrating through the containing cavity (21) can extend into the material guiding pipe (13), and the blocking block (3) is attached to the inner wall of the material guiding pipe (13);

The plugging block (3) is internally provided with a mounting cavity (31), the plugging block (3) is provided with a clamping mechanism (4) which is positioned in the mounting cavity (31), and when the plugging block (3) is positioned in the material guiding pipe (13), the plugging block (3) is clamped with the material guiding pipe (13) through the clamping mechanism (4);

The cover plate (2) is provided with a driving mechanism (5) connected with the clamping mechanism (4), and the driving mechanism is used for driving the clamping mechanism (4) to act so as to form the clamping or the cancellation of the clamping of the blocking block (3) and the material guide pipe (13).

2. A plastic bucket easy to open according to claim 1, characterized in that: the clamping mechanism (4) comprises:

The guide column (41) is vertical and fixed in the mounting cavity (31), and a loop bar (42) is movably sleeved outside the guide column (41);

The clamping plates (43) are two in number, the two clamping plates (43) are symmetrically arranged on two sides of the sleeve rod (42), clamping holes (131) are symmetrically formed in the inner side wall of the guide pipe (13), the two clamping plates (43) respectively penetrate through two sides of the sealing block (3) in a movable mode, one ends of the clamping plates (43) penetrating through the sealing block (3) can be inserted into the clamping holes (131) and are clamped with the clamping holes, hinge rods (44) are hinged to two sides of the sleeve rod (42), the other ends of the two hinge rods (44) are respectively clamped with the two clamping plates (43), the driving mechanism (5) is connected with the sleeve rod (42), and the driving mechanism (5) is used for enabling the sleeve rod (42) to slide along the guide column (41).

3. A plastic bucket easy to open according to claim 2, characterized in that: the driving mechanism (5) comprises a pull rod (51) which movably penetrates through the cover plate (2) and the plugging block (3), one end of the pull rod (51) extends into the mounting cavity (31) and is fixedly connected with the sleeve rod (42), and a first spring (52) sleeved outside the pull rod (51) is arranged between the sleeve rod (42) and the inner top wall of the mounting cavity (31).

4. A plastic bucket easy to open according to claim 1, characterized in that: the accommodating cavity (21) is internally provided with a second spring (6) sleeved outside the pull rod (51), and two ends of the second spring (6) are respectively connected with the plugging block (3) and the inner top wall of the accommodating cavity (21).

5. A plastic bucket easy to open according to claim 1, characterized in that: annular mounting grooves (32) are formed in the outer side walls of the plugging blocks (3), annular sealing gaskets (33) which are connected with the plugging blocks (3) in a clamping mode are inserted into the annular mounting grooves (32), and when the plugging blocks (3) are located in the material guiding pipes (13), the annular sealing gaskets (33) are in contact with the inner side walls of the material guiding pipes (13).

6. A plastic bucket easy to open according to claim 1, characterized in that: the cover plate (2) is hinged on the inner side wall of the groove (11), and the barrel body (1) is provided with a driving piece (7) acting on the cover plate (2) and used for enabling the cover plate (2) to rotate on the barrel body (1) so as to enable the cover plate (2) to be far away from the material guide pipe (13).

7. A plastic bucket easy to open according to claim 6 wherein: the driving part (7) comprises a fixed shaft (71) fixed on the inner side wall of the groove (11), the cover plate (2) is sleeved outside the fixed shaft (71) and hinged with the barrel body (1), a coil spring (72) is sleeved outside the fixed shaft (71), and two ends of the coil spring (72) are fixedly connected with the fixed shaft (71) and the cover plate (2) respectively.

8. A plastic bucket easy to open according to claim 1, characterized in that: u-shaped groove (14) has been seted up at staving (1) top and is located one side of recess (11), and just be located U-shaped groove (14) internal fixation in staving (1) has handle (15), and staving (1) bottom symmetry is fixed with support bar (16), and spacing groove (17) have been seted up to staving (1) top and be located recess (11) outside symmetry, and two support bars (16) can hide respectively to in two spacing grooves (17).