CN219215467U

CN219215467U - Filling mechanism of reagent pipe

Info

Publication number: CN219215467U
Application number: CN202320381314.5U
Authority: CN
Inventors: 王嘉铭; 史华; 王永生
Original assignee: Hebei Sheng Hua That Biologic Medical Science And Technology Ltd
Current assignee: Hebei Sheng Hua That Biologic Medical Science And Technology Ltd
Priority date: 2023-03-03
Filing date: 2023-03-03
Publication date: 2023-06-20
Anticipated expiration: 2033-03-03

Abstract

The utility model belongs to the technical field of medicament filling, and provides a filling mechanism of a reagent tube, which comprises a box body, wherein the top of the box body is provided with an opening, a cover plate is hinged in the box body, the cover plate is correspondingly arranged with the opening of the box body, clamping components are respectively arranged between the cover plate and the box body, a filling unit is arranged on the side wall of the cover plate, which is close to the inside of the box body, a reagent tube placing unit is connected in a sliding manner in the box body, the filling unit and the reagent tube placing unit or the inside of the box body are correspondingly arranged, a driving part is arranged between the reagent tube placing unit and the bottom of the inside of the box body, a switch is fixedly connected on the inner side wall of the short side, which is close to a rotating shaft of the filling unit, of the box body, the switch is correspondingly arranged with the driving part, the switch is electrically connected with the filling unit, and a controller is fixedly connected on the outer wall of the box body. The utility model has flexible and convenient use, can be manually carried and can carry out small-batch reagent tube filling work in various places.

Description

Filling mechanism of reagent pipe

Technical Field

The utility model belongs to the technical field of medicament filling, and particularly relates to a filling mechanism of a reagent tube.

Background

In order to ensure the convenience of transportation and use, the split charging and filling of the reagent with the specified capacity are a common means, and the filling equipment is widely applied to the production of biological medical reagents, chemical reagents, test reagents and other reagents.

The existing reagent tube filling equipment, like the patent with publication number CN216424835U, discloses a full-electric filling system, by filling device, spiral cover mechanism and reagent container carousel are constituteed, equipment structure is comparatively huge and need fix and carry out work in the place of predetermineeing, though work efficiency is higher, but need in the field such as investigation, scientific research when the reagent tube dropwise add work of small batch, indefinite place, large-scale filling equipment is not suitable, and adopts artifical filling mode time and energy and the precision is poor, inefficiency. Therefore, there is a need for a reagent tube filling mechanism that is convenient for manual handling and can be used for small-batch filling operations in a variety of locations.

Disclosure of Invention

The utility model aims to provide a filling mechanism of a reagent tube, which solves the problems and achieves the purposes of convenient carrying and capability of filling in various places.

In order to achieve the above object, the present utility model provides the following solutions: the utility model provides a liquid filling mechanism of reagent pipe, includes the box, the top of box is the opening setting, articulated between the two opposite long limit lateral walls of box have the apron, the apron with the opening of box corresponds the setting, the apron with be provided with the card respectively between the two opposite long limit lateral walls of box and hold the subassembly, the apron is close to be provided with the filling unit on the inside lateral wall of box, sliding connection has the reagent pipe to place the unit between the two opposite long limit lateral walls of box, the reagent pipe place the unit with be provided with drive division between the inboard bottom of box, the box is close to fixedly connected with switch on the minor face inside wall of filling unit, the switch with drive division corresponds the setting, switch with filling unit electric connection, fixedly connected with controller on the outer wall of box, the controller with drive division electric connection.

Preferably, the filling unit comprises a liquid storage tank and a plurality of liquid pumps, wherein the liquid storage tank and the liquid pumps are respectively and fixedly connected to a side wall of the cover plate, which is close to the inside of the box, the liquid storage tank is positioned above the liquid pumps, the liquid pumps are respectively communicated with hoses, the bottoms of the liquid pumps are respectively communicated with filling heads, the filling heads are respectively and correspondingly arranged with the reagent tube placing unit, and the liquid pumps are respectively and electrically connected with the switch.

Preferably, the reagent tube placing unit comprises a movable plate, the horizontal sliding connection of the movable plate is in between the two opposite long side walls of the box, the bottom of the movable plate is in transmission connection with the driving part, a plurality of through holes are vertically formed in the movable plate, the through holes are respectively and correspondingly formed in the filling heads, a plurality of reagent tube placing grooves are respectively and fixedly connected to the bottom of the movable plate, the reagent tube placing grooves and the through holes are coaxially formed, four clamping assemblies are respectively arranged on the inner wall of the reagent tube placing groove, and the four clamping assemblies are arranged at equal intervals along the inner wall of the reagent tube placing groove and are located at the same height.

Preferably, the clamping assembly comprises a groove and a clamping block vertically arranged on the side wall of the reagent tube placing groove, the top end of the clamping block is hinged to the top of the inner side of the groove, the bottom end of the clamping block is abutted to the bottom of the groove, and a first spring is abutted between the clamping block and the inner side wall of the groove.

Preferably, the driving part comprises a second chute arranged at the bottom of the moving plate, the second chute is arranged along the long side direction of the box body, a sliding rod is connected in the second chute in a sliding manner, a second spring is abutted between one end of the sliding rod, which is close to the switch, and the side wall of the second chute, a switch control component is fixedly connected with one end of the sliding rod, which is close to the switch, and is correspondingly arranged, one end, which is far away from the switch, of the bottom wall of the sliding rod is hinged with one end of the push-pull rod, the inner bottom of the box body is rotationally connected with a gear, the side part of the gear is hinged with the other end of the push-pull rod, a speed reducing motor is vertically and fixedly connected with the inner bottom of the box body, a half gear is fixedly connected with an output shaft of the speed reducing motor, the half gear is meshed with the gear, and the speed reducing motor is electrically connected with the controller.

Preferably, the switch control assembly comprises a cylindrical ejector rod, the cylindrical ejector rod is fixedly connected to one end, close to the switch, of the bottom wall of the sliding rod, the axis direction of the cylindrical ejector rod is parallel to the moving direction of the sliding rod, and one end, close to the switch, of the cylindrical ejector rod is correspondingly arranged with the switch.

Preferably, the clamping assembly comprises two groups of first fixing holes formed in the side wall of the long side of the box body, one first fixing hole is located below the rotating shaft of the cover plate, the other first fixing hole is located between the rotating shaft of the cover plate and the side wall of the short side of the switch, a second fixing hole is formed in one end, close to the rotating shaft, of the side wall of the cover plate, the two groups of first fixing holes are respectively and correspondingly arranged with the second fixing holes, and the first fixing holes are in limiting connection with the second fixing holes through pins.

The utility model has the following technical effects: the cover plate is mainly used for sealing the opening of the box body in a non-use state, and standing the filling unit from the box body and providing working support in the use state; the main function of the filling unit is to quantitatively fill the liquid medicine into the reagent tube; the main function of the reagent tube placing unit is to enable the reagent tube to be placed stably and move to the bottom of the filling unit before filling, and the reagent tube is sent out after filling; the main function of the driving part is to drive the reagent tube placing unit to move; the switch is controlled by the driving part, and the opening or closing of the switch can control the stopping or running of the filling operation of the filling unit; the main function of the controller is to control the driving part to control the speed according to the actual liquid medicine filling amount. The utility model is flexible and convenient to use, can be carried manually and can carry out small-batch reagent tube filling work in various places.

Drawings

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

FIG. 1 is a front cross-sectional view of the filling mechanism of the present utility model in an operative state;

FIG. 2 is a top cross-sectional view of the filling mechanism of the present utility model in an operational state;

FIG. 3 is a bottom cross-sectional view of the filling mechanism of the present utility model in an operative state;

FIG. 4 is a right side cross-sectional view of the filling mechanism of the present utility model in an operative state;

FIG. 5 is an enlarged view of part A of FIG. 1;

FIG. 6 is a schematic view of the closing state of the filling mechanism of the present utility model;

wherein, 1, the box body; 2. a cover plate; 3. a liquid storage tank; 4. a liquid pump; 5. a first chute; 6. a moving plate; 7. a reagent tube placement tank; 8. clamping blocks; 9. a groove; 10. a first spring; 11. a second chute; 12. a slide bar; 13. a second spring; 14. a push-pull rod; 15. a gear; 16. a half gear; 17. a speed reducing motor; 18. a switch; 19. a cylindrical ejector rod; 20. a first fixing hole; 21. a second fixing hole; 22. a pin; 23. a roller; 24. a lifting rod; 25. a hose; 26. a filling head; 27. and a controller.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only 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.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

Referring to fig. 1-6, the utility model provides a filling mechanism of a reagent tube, which comprises a box body 1, wherein the top of the box body 1 is provided with an opening, a cover plate 2 is hinged between two opposite long side walls of the box body 1, the cover plate 2 is correspondingly arranged with the opening of the box body 1, clamping components are respectively arranged between the cover plate 2 and the two opposite long side walls of the box body 1, a filling unit is arranged on the side wall of the cover plate 2, which is close to the inside of the box body 1, a reagent tube placing unit is slidingly connected between the two opposite long side walls of the box body 1, a driving part is arranged between the reagent tube placing unit and the bottom of the inside of the box body 1, a switch 18 is fixedly connected on the inner side wall, which is close to the filling unit, of the box body 1 is correspondingly arranged with the driving part, the switch 18 is electrically connected with a controller 27, and the controller 27 is electrically connected with the driving part.

The cover plate 2 has the main functions of sealing the opening of the box body 1 in a non-use state, facilitating the storage and carrying of the mechanism, and standing the filling unit from the box body 1 and providing working support in the use state; the main function of the filling unit is to quantitatively fill the liquid medicine into the reagent tube; the main function of the reagent tube placing unit is to enable the reagent tube to be placed stably and move to the bottom of the filling unit before filling, and the reagent tube is sent out after filling; the main function of the driving part is to drive the reagent tube placing unit to move; the switch 18 is controlled by the driving part, and the opening or closing of the switch 18 can control the stopping or running of the filling operation of the filling unit; the main function of the controller 27 is to control the drive unit to perform speed control according to the actual amount of liquid medicine filled. The utility model is flexible and convenient to use, can be carried manually and can carry out small-batch reagent tube filling work in various places.

Further optimizing scheme, the filling unit includes liquid storage pot 3 and a plurality of liquid pump 4, and liquid storage pot 3 and a plurality of liquid pump 4 are fixed connection respectively on apron 2 is close to a lateral wall of box 1 inside, and liquid storage pot 3 is located the top of a plurality of liquid pump 4, and the intercommunication has hose 25 respectively between a plurality of liquid pump 4 and the liquid storage pot 3, and the bottom of a plurality of liquid pump 4 is communicated with filling head 26 respectively, and a plurality of filling head 26 respectively with reagent pipe place the unit and correspond the setting, a plurality of liquid pump 4 respectively with switch 18 electric connection.

The liquid storage tank 3 can store the liquid medicine to be filled; the liquid medicine in the liquid storage tank 3 flows into the liquid pump 4 through the hose 25, and flows out from the bottom of the filling head 26 to be filled into the reagent tube through the pumping of the liquid pump 4.

Further optimizing scheme, reagent pipe placing element includes movable plate 6, movable plate 6 horizontal sliding connection is between the two opposite long limit lateral walls of box 1, the bottom and the drive part transmission of movable plate 6 are connected, a plurality of through-holes have been vertically seted up on the movable plate 6, a plurality of through-holes correspond the setting with a plurality of filling heads 26 respectively, the bottom of movable plate 6 is fixedly connected with a plurality of reagent pipe standing grooves 7 respectively, a plurality of reagent pipe standing grooves 7 and a plurality of through-hole coaxial line set up, all be provided with four sets of clamping assembly on the inner wall of a plurality of reagent pipe standing grooves 7, four sets of clamping assembly set up and are located same height along the equidistant setting of inner wall of reagent pipe standing groove 7.

The two opposite long side walls in the box body 1 are respectively transversely provided with a first chute 5, a moving plate 6 is connected in the first chute 5 in a sliding way, and the main function of the reagent tube placing groove 7 is to provide a placing position for the reagent tube; the main function of the clamping assembly is to prevent the reagent tube from shaking after the reagent tube is placed in the reagent tube placing groove 7. After the moving plate 6 is driven by the driving part to move to the end part of the first chute 5, which is close to the switch 18, the orifice of the reagent tube in the reagent tube placing groove 7 is just positioned under the filling head 26.

Further optimizing scheme, the clamp assembly includes recess 9 and clamp splice 8 of vertical seting up on reagent pipe standing groove 7 lateral wall, and the top of clamp splice 8 articulates at the inboard top of recess 9, and the bottom butt of clamp splice 8 has first spring 10 in the bottom of recess 9 between the inside wall of clamp splice 8 and recess 9.

Under the clamping force of the clamping blocks 8 uniformly distributed in four directions, the reagent tube can ensure no obvious shaking in the filling process and prevent waste caused by outflow of liquid medicine.

Further optimizing scheme, the drive part is including seting up the second spout 11 in the bottom of movable plate 6, the second spout 11 is offered along the long limit direction of box 1, sliding connection has slide bar 12 in second spout 11, the butt has second spring 13 between the lateral wall of slide bar 12 and the lateral wall of second spout 11 near switch 18, the one end fixedly connected with switch control assembly that slide bar 12 is close to switch 18, switch control assembly corresponds the setting with switch 18, the one end that switch 18 was kept away from to slide bar 12 diapire articulates there is push-and-pull rod 14's one end, the inboard bottom of box 1 rotates and is connected with gear 15, the limit portion of gear 15 and with push-and-pull rod 14's the other end articulates, the vertical fixedly connected with gear motor 17 in inboard bottom of box 1, gear motor 17's output shaft fixedly connected with half gear 16, half gear 16 meshes with gear 15, gear motor 17 and controller 27 electric connection.

Further optimizing scheme, the switch control assembly includes cylinder ejector pin 19, and cylinder ejector pin 19 fixed connection is close to the one end of switch 18 at the diapire of slide bar 12, and the axis direction of cylinder ejector pin 19 and the direction parallel arrangement of movement of slide bar 12, and the one end that cylinder ejector pin 19 is close to switch 18 corresponds the setting with switch 18.

A fur is stuck to the bottom of the moving plate 6, and the fur is attached to the push-pull rod 14. In the initial state, the moving plate 6 is at an end remote from the switch 18. The controller 27 controls the gear motor 17 to rotate, the gear motor 17 drives the half gear 16 to rotate and mesh with the gear 15, the gear 15 rotates to drive the push-pull rod 14 to push the slide rod 12 inwards, and the slide rod 12 drives the moving plate 6 to slide towards the direction of the switch 18 by extruding the second spring 13. When the moving plate 6 is abutted to the end part of the first chute 5, the half gear 16 still drives the gear 15 to rotate, the slide bar 12 continues to squeeze the second spring 13 and drives the cylindrical push rod 19 to abut against the switch 18, at this time, the liquid pump 4 is started, and the filling head 26 fills the liquid medicine into the test tube. At this time, the push-pull rod 14, the intersection point of the push-pull rod 14 and the gear 15, the three points of the axis point of the gear 15 are in a straight line, meanwhile, the half gear 16 is separated from the gear 15, and the rotation of the gear 15 is stopped after half a turn due to the resistance of the fur to the push-pull rod 14, so that the liquid pump 4 can continuously work. When the half gear 16 is meshed with the gear 15 again under the drive of the gear motor, the gear 15 rotates, the sliding rod 12 is pulled outwards through the push-pull rod 14 to enable the cylindrical ejector rod 19 to be separated from the switch 18, the liquid pump 4 stops filling, the sliding rod 12 is pulled continuously to enable the movable plate 6 to slide outwards, when the movable plate 6 abuts against the end portion, far away from the switch 18, of the first sliding groove 5, the gear 15 rotates for half a circle, the half gear 16 is separated from the gear 15, and the movable plate 6 stops sliding. The rotation speed of the speed reducing motor is controlled by the controller 27, so that the time for the cylindrical ejector rod 19 to prop against the switch 18 can be controlled, and the liquid medicine amount of single filling can be controlled.

Further optimizing scheme, the clamping assembly is including seting up two sets of first fixed orifices 20 on the long limit lateral wall of box 1, and a first fixed orifice 20 is located the below of apron 2 pivot, and another first fixed orifice 20 is located between the pivot of apron 2 and the minor face lateral wall of box 1 rigid coupling switch 18, and the second fixed orifice 21 has been seted up to the lateral wall of apron 2's one end that is close to the pivot, and two sets of first fixed orifices 20 correspond the setting with second fixed orifice 21 respectively, and first fixed orifice 20 passes through pin 22 spacing connection with second fixed orifice 21.

In the closed state of the cover plate 2, the second fixing holes 21 are aligned with the first fixing holes 20 positioned above, and the pins 22 are inserted into the first fixing holes to prevent the cover plate 2 from being opened, so that the storage and the carrying are convenient; in the open state of the cover plate 2, the second fixing holes 21 are aligned with the first fixing holes 20 positioned below, and the filling work can be performed by inserting the pins 22.

Further optimizing scheme, the bottom one end of box 1 rotates and is connected with two sets of gyro wheels 23, and the other end fixedly connected with lifting rod 24.

The rollers 23 and the lifting rod 24 can further improve the flexibility and portability of the filling mechanism.

The working procedure of this embodiment is as follows: before the filling mechanism is used, the cover plate 2 is tightly buckled in the opening of the box body 1 under the locking action of the pin 22, and the filling mechanism can be carried by the lifting rod 24. When the reagent tube needs to be filled, the pins 22 are pulled out, the cover plate 2 is opened upwards to be in a vertical state, and then two groups of pins 22 are inserted into the second fixing holes 21 and the first fixing holes 20 positioned below, so that the cover plate 2 is fixed. The liquid medicine is added into the liquid storage tank 3, the gear motor 17 is controlled to rotate by the controller 27, the moving plate 6 is moved in a direction away from the switch 18, the reagent tube placing groove 7 is staggered with the filling head 26, and the reagent tubes are placed conveniently. The reagent tube is sequentially inserted into the reagent tube placing groove 7, the rotating speed of the gear motor 17 is set through the controller 27 according to the filling quantity into the test tube, the gear motor 17 is started, the gear motor 17 sequentially enables the moving plate 6 to slide inwards through the half gear 16, the gear 15, the push-pull rod 14, the sliding rod 12 and the second spring 13, the reagent tube orifice is located below the filling head 26, the sliding rod 12 continues to slide and drives the cylindrical ejector rod 19 to abut against the switch 18, and at the moment, the liquid pump 4 is started, and liquid medicine is filled into the test tube through the filling head 26. The gear motor 17 continues to work, when the half gear 16 is meshed with the gear 15 again, the gear 15 rotates, the sliding rod 12 is pulled outwards through the push-pull rod 14, the cylindrical ejector rod 19 is separated from the switch 18, the liquid pump 4 stops filling, the sliding rod 12 is pulled continuously to enable the moving plate 6 to slide outwards, and when the moving plate 6 abuts against the outer end of the first sliding groove 5, the gear motor 17 stops rotating, and the reagent tube is taken out of the reagent tube placing groove 7. After use, the cover plate 2 is covered and the pin 22 is inserted.

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.

Claims

1. A filling mechanism of reagent pipe, its characterized in that: the automatic packaging box comprises a box body (1), wherein the top of the box body (1) is provided with an opening, a cover plate (2) is hinged between two opposite long side walls of the box body (1), the cover plate (2) is correspondingly arranged with the opening of the box body (1), clamping components are respectively arranged between the cover plate (2) and the two opposite long side walls of the box body (1), the cover plate (2) is close to a filling unit arranged on the side wall inside the box body (1), a reagent tube placing unit is connected between the two opposite long side walls of the box body (1) in a sliding manner, a driving part is arranged between the reagent tube placing unit and the inner bottom of the box body (1), the box body (1) is close to a switch (18) fixedly connected to the inner side wall of the filling unit, the switch (18) is correspondingly arranged with the driving part, a controller (27) is fixedly connected to the outer wall of the box body (1), and the controller (27) is electrically connected with the driving part.

2. A reagent tube filling mechanism according to claim 1, wherein: the filling unit comprises a liquid storage tank (3) and a plurality of liquid pumps (4), the liquid storage tank (3) and the liquid pumps (4) are respectively and fixedly connected to a side wall, close to the box body (1), of the cover plate (2), the liquid storage tank (3) is located in a plurality of the liquid pumps (4) above, the liquid pumps (4) and the liquid storage tank (3) are respectively communicated with a hose (25), the bottoms of the liquid pumps (4) are respectively communicated with a filling head (26), the filling heads (26) are respectively and correspondingly arranged with the reagent tube placing unit, and the liquid pumps (4) are respectively and electrically connected with the switch (18).

3. A reagent tube filling mechanism according to claim 2, wherein: the reagent tube placing unit comprises a moving plate (6), wherein the moving plate (6) is horizontally and slidably connected between two opposite long-side walls of the box body (1), the bottom of the moving plate (6) is in transmission connection with the driving part, a plurality of through holes are vertically formed in the moving plate (6), the through holes are respectively and correspondingly formed in the filling heads (26), a plurality of reagent tube placing grooves (7) are fixedly connected to the bottom of the moving plate (6), the reagent tube placing grooves (7) and the through holes are coaxially formed, four clamping assemblies are arranged on the inner wall of the reagent tube placing grooves (7) at equal intervals, and the clamping assemblies are located at the same height.

4. A reagent tube filling mechanism according to claim 3, wherein: the clamping assembly comprises a groove (9) and a clamping block (8) which are vertically arranged on the side wall of the reagent tube placing groove (7), the top end of the clamping block (8) is hinged to the inner side top of the groove (9), the bottom end of the clamping block (8) is abutted to the bottom of the groove (9), and a first spring (10) is abutted between the clamping block (8) and the inner side wall of the groove (9).

5. A reagent tube filling mechanism according to claim 3, wherein: the driving part comprises a second chute (11) arranged at the bottom of the movable plate (6), the second chute (11) is arranged along the long side direction of the box body (1), a slide bar (12) is connected in the second chute (11) in a sliding mode, the slide bar (12) is close to one end of the switch (18) and a second spring (13) is abutted between the side walls of the second chute (11), the slide bar (12) is close to one end of the switch (18) and fixedly connected with a switch control assembly, the switch control assembly is correspondingly arranged with the switch (18), one end of the bottom wall of the slide bar (12) away from one end of the switch (18) is hinged with one end of a push-pull rod (14), the inner bottom of the box body (1) is rotatably connected with a gear (15), the side part of the gear (15) is hinged with the other end of the push-pull rod (14), the inner bottom of the box body (1) is vertically and fixedly connected with a speed reducing motor (17), an output shaft of the speed reducing motor (17) is fixedly connected with a half gear (16), and the half gear (16) is meshed with the speed reducing motor (17).

6. The reagent tube filling mechanism of claim 5, wherein: the switch control assembly comprises a cylindrical ejector rod (19), the cylindrical ejector rod (19) is fixedly connected to one end, close to the switch (18), of the bottom wall of the sliding rod (12), the axis direction of the cylindrical ejector rod (19) is parallel to the moving direction of the sliding rod (12), and one end, close to the switch (18), of the cylindrical ejector rod (19) is correspondingly arranged with the switch (18).

7. A reagent tube filling mechanism according to claim 2, wherein: the clamping assembly comprises two groups of first fixing holes (20) formed in the side wall of the long side of the box body (1), one first fixing hole (20) is located below the rotating shaft of the cover plate (2), the other first fixing hole (20) is located between the rotating shaft of the cover plate (2) and the side wall of the short side of the box body (1) fixedly connected with the switch (18), a second fixing hole (21) is formed in the side wall of the cover plate (2) close to one end of the rotating shaft, the two groups of first fixing holes (20) are respectively and correspondingly arranged with the second fixing holes (21), and the first fixing holes (20) are in limiting connection with the second fixing holes (21) through pins (22).