Automatic opening and closing door for poultry

Abstract

The utility model discloses an automatic opening and closing door for poultry, and provides a single-side or double-side driving simplified scheme aiming at the problems that an existing middle door plate is provided with a hole groove (also used as a chain), and a single motor driving scheme is high in noise and poor in compatibility. The device comprises a door body, a door frame piece and symmetrically-arranged sliding groove edge strips, a rack is meshed with a driving device, and linear motion of the door body is achieved in cooperation with guiding of sliding grooves; during single-side driving, the second edge outer strip only keeps the sliding groove to provide passive supporting, and meanwhile a balance sliding wheel is arranged at the top. A non-driving side adopts a standardized chute design and can be replaced by a universal guide rail module, so that the door frame can be quickly integrated with an existing door frame. The driving device integrates a gear module, a battery, a Hall switch and a magnet induction unit, efficient and stable operation is achieved in combination with structural limiting and a waterproof outer cover, and the risk of abrasion unbalance of a synchronous driving system is avoided. The scheme has the advantages of low cost, easiness in adaptation and high expansibility, and is particularly suitable for automatic upgrading requirements of small and medium-sized farms.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of poultry house feeding equipment, especially a kind of poultry automatic door. BACKGROUND

[0002] The conventional poultry farm automatic door system is mostly designed with the structure of middle door plate opening slot, and the door body movement is realized by built-in chain transmission mechanism in the door plate. This kind of scheme needs to set continuous chain link matching slot hole in the door plate, and uses single motor to drive chain to slide the door body. However, this structure has significant defects in practical application: first, the intermittent engagement between chain and hole slot is easy to produce high-frequency impact noise (usually more than 65dB), and long-term operation is easy to cause poultry stress reaction; second, the integrated door plate structure leads to poor system compatibility, and it is difficult to adapt to different specifications of breeding shed door frame, especially when old chicken house is transformed, it needs to be customized to open slot, which greatly increases the installation cost; third, chain transmission system is easy to rust and wear in humid environment, and needs frequent lubrication and maintenance, and the lack of synchronous precision of double-drive side is easy to cause door body deviation and aggravate the risk of single-side wear of guide rail.

[0003] Although the existing improved scheme attempts to use synchronous belt or linear motor drive, the former still has the problems of complex tension adjustment and easy brittle fracture in low temperature environment, and the latter faces technical bottlenecks such as poor waterproof and dustproof performance and high energy consumption. Especially for small and medium-sized farms, the existing automatic door system generally has the disadvantages of low modularization degree, high maintenance cost and insufficient expandability. Therefore, a new type of poultry automatic door device with simplified structure, strong compatibility and stable operation is urgently needed. UTILITY MODEL CONTENTS

[0004] In view of the above situation, it is necessary to provide a poultry automatic door that solves at least one of the above problems, comprising a door body (1), a door frame (2), a first edge strip (31), a second edge strip (32) and a driving device (4);

[0005] The first edge strip (31) and the second edge strip (32) are symmetrically fixed on the left and right sides of the door frame (2), and the first edge strip (31) and the second edge strip (32) are both provided with a sliding groove (311) extending along the length direction thereof;

[0006] The door body (1) is slidingly embedded between the sliding grooves (311) of the first edge strip (31) and the second edge strip (32);

[0007] The side of the first edge strip (31) is fixedly connected with a gear rack (312), the driving device (4) is fixed on the door body (1), the driving device (4) is provided with a gear structure (41) engaged with the gear rack (312), and the gear structure (41) is driven by a motor (42) to move the door body (1) along the direction of the sliding groove (311).

[0008] Preferably, the driving device (4) further comprises a housing (43), a battery (44) and a numerical control board (45);

[0009] The housing (43) is long strip-shaped and fixed to one side of the door body (1);

[0010] The left side area of the housing (43) is provided with a groove (431), and the gear structure (41) is located in the groove (431);

[0011] The right side area of the housing (43) is provided with a clamping seat structure (46), the battery (44) is detachably installed in the housing (43) through the clamping seat structure (46), and the battery (44) is electrically connected with the motor (42).

[0012] Preferably, the gear structure (41) comprises a first gear (411) and a second gear (412);

[0013] The first gear (411) is coaxially fixed to the output shaft of the motor (42), the axial direction of the second gear (412) is perpendicular to the axial direction of the first gear (411), and the second gear (412) is respectively engaged with the first gear (411) and the gear row (312).

[0014] Preferably, the clamping seat structure (46) comprises oppositely arranged baffles (461) and adapter seats (462), the adapter seats (462) are provided with curved grooves (4621) accommodating the batteries (44), and the baffles (461) are fixed to limiting protrusions (4611) on the inner side of the curved grooves (4621).

[0015] Preferably, the sliding groove (311) of the first edge strip (31) is provided with a wear-resistant bushing (3111) on the inner side, and the frame end of the door body (1) is embedded in the wear-resistant bushing (3111) and slides.

[0016] Preferably, the groove (431) is symmetrically provided with threaded fixing holes (4311) on both sides, and the motor (42) is fastened in the threaded fixing holes (4311) through bolts.

[0017] Preferably, the dedendum circle diameter of the second gear (412) is greater than the addendum circle diameter of the first gear (411), and the modulus of the second gear (412) is equal to the modulus of the gear row (312).

[0018] Preferably, the outer side of the housing (43) is covered with a waterproof cover (47), and the waterproof cover (47) is detachably connected with the housing (43) through a buckle structure.

[0019] Preferably, three balance bearings (5) are further included, two side edges of the door body (1) are provided with limiting edges (6), two balance bearings (5) are respectively arranged on the two sides of the door frame (2) and are horizontally aligned, and one balance bearing (5) is arranged in the groove (431), and the second gear (412) is sleeved with the balance bearing (5) arranged in the groove (431).

[0020] Preferably, an opening door magnet (7), a closing door magnet (8) and a Hall sensor (9) are further included, the opening door magnet (7) and the closing door magnet (8) are arranged on the inner wall surface of the sliding groove (311), and the Hall sensor (9) is fixedly arranged on the shell (43). BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure schematic diagram of the poultry automatic opening and closing door of the embodiment of the utility model.

[0022] Figure 2 It is an explosion view of the driving device of the embodiment of the utility model.

[0023] Figure 3 It is a structure schematic diagram of the first edge strip and the second edge strip of the embodiment of the utility model.

[0024] Figure 4 It is an explosion view of the driving device of the embodiment of the utility model.

[0025] Figure 5 It is a structure schematic diagram of the shell of the embodiment of the utility model.

[0026] Figure 6 It is a position structure schematic diagram of the opening door magnet and the closing door magnet installation of the embodiment of the utility model.

[0027] Figure 7 It is a structure schematic diagram of the door body closing door of the embodiment of the utility model.

[0028] Figure 8 It is a structure schematic diagram of the door body opening door of the embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the utility model more clear, the poultry automatic opening and closing door is further described in detail below by combining with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0030] In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two;The orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only for description purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0032] Please see Figures 1 to 5 The utility model discloses an automatic poultry door, including door main body (1), door frame piece (2), first edge strip (31), second edge strip (32) and drive arrangement (4), first edge strip (31) and second edge strip (32) are fixedly arranged on the left and right sides of door frame piece (2), the sliding slot (311) that extends along its length direction is established on first edge strip (31) and second edge strip (32), and the door main body (1) is slidably embedded between the sliding slot (311) of first edge strip (31) and second edge strip (32), the side of first edge strip (31) is fixedly connected with the gear rack (312), the drive arrangement (4) is fixed on the door main body (1), the drive arrangement (4) is equipped with the gear structure (41) engaged with the gear rack (312), and the gear structure (41) is driven to drive the door main body (1) to move along the direction of sliding slot (311) (the moving direction is linear direction, and the special installation is not limited to the linear motion door of arbitrary direction).

[0033] Only need to set the row of teeth (312) in the first edge bar (31), and the second edge bar (32) only acts as a sliding groove guide rail, reducing the processing and installation cost of the row of teeth. For example, the traditional double-sided row of teeth scheme requires high alignment accuracy on both sides, and this scheme saves material cost by omitting the processing step of the row of teeth (312) of the second edge bar (32). When single-side driving, the sliding grooves (311) on both sides of the door body (1) constrain the displacement direction through rigid sliding rails, the driving side gear (41) meshes with the row of teeth (312) to provide power, and the non-driving side sliding groove is passively guided, effectively avoiding the problem of "double-drive out-of-sync jamming" caused by processing errors of the double-sided row of teeth. Only the single-side row of teeth (312) and the gear structure (41) need to be repaired or worn out, without the need to disassemble the door frame as a whole (such as cleaning or replacing the second edge bar (32) without the need to handle the transmission components). This embodiment avoids the problem of high noise of the traditional chain transmission by single-side gear driving combined with double-side sliding groove guiding, and at the same time, the door body (1) is bidirectionally constrained by the sliding grooves, ensuring smooth operation. The bidirectional sliding grooves (311) are symmetrically distributed, making the forces on both sides of the door body uniform when the door body slides, avoiding the problem of easy jamming of single-side sliding rails; the row of teeth (312) meshes with the gear structure (41) to drive, replacing the traditional chain system, the contact line length of the gear meshing pair is larger and there is no risk of loosening, directly reducing noise; the door body (1) and the sliding groove (311) form a surface contact guide, which has improved resistance to lateral impact compared to the traditional roller point contact, and is compatible with different sizes of door body installation.

[0034] The door frame (2) is fixed with the first edge bar (31) and the second edge bar (32) on both sides, and the sliding grooves (311) of the edge bars are aligned to form a guide rail, and the door body (1) is embedded in the sliding grooves (311) to slide; the row of teeth (312) is fixed on the side of the first edge bar (31), and the driving device (4) meshes with the row of teeth (312) through the gear structure (41), when the motor (42) operates, the gear (41) rolls along the row of teeth (312), driving the door body (1) to move linearly along the sliding groove (311), realizing the automatic opening and closing of the door body. The door frame (2) is installed at the door opening of the chicken house wall, the door body (1) is embedded in the sliding grooves (311) of the first edge bar (31) and the second edge bar (32), and the motor (42) starts after receiving the control signal from the numerical control panel, the gear structure (41) meshes with the row of teeth (312) and drives the door body (1) to move upward or downward, for example, to open at a fixed time in the early morning and close in the evening. The gear and the row of teeth drive in a simple structure and stable transmission, without the need for chains or belts, avoiding the risk of loosening and aging, while reducing noise; the sliding groove cooperates with the door body to slide, the linear motion is smooth, and the swing wear of the traditional hinge system is reduced.

[0035] Please attend Figures 1 to 8In another embodiment, the driving device (4) further comprises a housing (43), a battery (44) and a numerical control board (45), the housing (43) is long strip-shaped and fixed to one side of the door body (1), the left side area of the housing (43) is provided with a groove (431), the gear structure (41) is located in the groove (431), the right side area of the housing (43) is provided with a clamping seat structure (46), the battery (44) is detachably installed in the housing (43) through the clamping seat structure (46), and the battery (44) is electrically connected with the motor (42). The housing (43) is fixed to the side of the door body (1), the left side groove (431) bears the gear structure (41), and the right side clamping seat structure (46) fixes the battery (44); the battery (44) supplies power for the motor (42), and the numerical control board (45) controls the start and stop and steering of the motor through a program. The housing (43) is fixed to the side of the door body (1), the battery (44) is clamped into the right side of the housing (43) through the clamping seat structure (46), and the numerical control board (45) is preset to open and close the door for a time, for example, the motor (42) is started and rotates forward to open the door at 5:00 every day, and is reversed to close the door at 18:00. The detachable design of the battery (44) facilitates maintenance and replacement; the housing (43) integrates the driving assembly and the power supply, the overall structure is compact, and the protection is strong.

[0036] Please attend Figures 1 to 8 In another embodiment, the gear structure (41) comprises a first gear (411) and a second gear (412), the first gear (411) is coaxially fixed to the output shaft of the motor (42), the second gear (412) is arranged in an axial direction perpendicular to the axial direction of the first gear (411), and the second gear (412) is meshed with the first gear (411) and the gear row (312) respectively. The motor (42) drives the first gear (411) to rotate, the second gear (412) acts as an intermediate transmission gear, its axial direction is perpendicular to the first gear (411), the rotation direction is converted into a rotation plane matched with the gear row (312) through the meshing of the two gears, and torque transmission is realized. When the motor (42) is started, the first gear (411) drives the second gear (412) to rotate, the second gear (412) rolls along the gear row (312), and the door body (1) translates. For example, when the motor rotates at a speed of 30 rpm, the door body moving speed can be adjusted through the gear modulus and the gear row density. The double-gear configuration increases the torque, adapts to small and low-power motors, and the steering conversion design makes the driving device (4) layout more flexible.

[0037] Please attend Figures 1 to 8In another embodiment, the card seat structure (46) comprises oppositely arranged baffles (461) and adapters (462), the adapters (462) are provided with curved grooves (4621) for accommodating the battery (44), and the baffles (461) are fixedly connected with limiting protrusions (4611) facing the inner side of the curved grooves (4621). The battery (44) is inserted into the curved groove (4621) of the adapter (462), the limiting protrusion (4611) abuts against the battery shell to limit displacement, and the baffle (461) prevents the battery from falling out, ensuring the stable fixation of the battery (44) in a vibrating environment. The battery (44) is pushed into the card seat structure (46) along the curved groove (4621) to the position of the limiting protrusion (4611), and the baffle (461) blocks the outward sliding of the battery. When disassembling, the battery can be taken out by applying force in the opposite direction. The battery is quickly installed and shock-resistant; without screw tools, maintenance is convenient.

[0038] Please attend Figures 1 to 8 In another embodiment, the first edge bar (31) is provided with a wear-resistant bushing (3111) inside the sliding groove (311), and the frame end of the door body (1) is embedded in the wear-resistant bushing (3111) for sliding. The wear-resistant bushing (3111) is embedded in the sliding groove (311), and the frame end of the door body (1) slides through the wear-resistant bushing (3111) and the sliding groove (311). The wear-resistant bushing (3111) directly bears the sliding friction of the door body, reducing the wear of the metal material of the sliding groove (311). The polyurethane wear-resistant bushing (3111) is pressed into the sliding groove (311) of the first edge bar (31) and the second edge bar (32), and the U-shaped frame on both sides of the door body (1) is embedded in the bushing for sliding. It can effectively avoid deformation or rust of the sliding groove. Significantly reduce the mechanical wear of the sliding groove (311) and prolong the service life; the polyurethane material has wear resistance and elasticity, and the noise during operation is lower.

[0039] Please attend Figures 1 to 8 In another embodiment, the recess (431) is symmetrically provided with threaded fixing holes (4311) on both sides, and the motor (42) is fastened in the threaded fixing holes (4311) by bolts. The threaded fixing holes (4311) on both sides of the recess (431) are aligned with the mounting holes of the motor (42) shell, and the motor (42) is fastened to the shell (43) by bolts passing through the two holes, ensuring that the motor (42) does not displace in a vibrating environment. When installing the motor (42), align the motor shell with the threaded fixing holes (4311) of the recess (431), insert an M4 bolt and tighten it, so that the motor output shaft and the first gear (411) remain coaxial. For example, using a lock washer can further prevent the bolt from loosening due to long-term vibration. The motor (42) is fixed in a simple and reliable manner, and has strong anti-vibration performance; the symmetrical design of the threaded holes facilitates quick alignment and installation, reducing assembly difficulty.

[0040] Please attend Figures 1 to 8In another embodiment, the second gear (412) has a dedendum diameter greater than the addendum diameter of the first gear (411), and the modulus of the second gear (412) is equal to the modulus of the gear rack (312). The dedendum diameter of the second gear (412) ensures that it completely envelops the addendum circle of the first gear (411), achieving interference-free meshing; the modulus of the second gear (412) is consistent with that of the gear rack (312), ensuring that the tooth spacing matches when the two are meshed, avoiding jamming or tooth skipping. The first gear (411) has a modulus of 1.5 and 16 teeth, and the second gear (412) has a modulus of 1.5 and 20 teeth. The second gear (412) is fixed on the housing (43) by a balance bearing, which can reduce the transmission torque and further ensure the balance and smoothness of power transmission. The gear rack (312) has a modulus of 1.5. When the motor (42) starts, the second gear (412) is stably meshed with the first gear (411) and the gear rack (312), ensuring smooth power transmission through modulus consistency. The unified design of gear modulus reduces processing and maintenance costs, and the close meshing of gears improves power output efficiency.

[0041] Please attend Figures 1 to 8 In another embodiment, the outer side of the housing (43) is covered with a waterproof cover (47) which is detachably connected to the housing (43) by a buckle structure. The waterproof cover (47) is a PVC or ABS plastic cover with a clamping groove on the inner wall matching the outer edge of the housing (43). The cover is buckled with the housing (43) to cover the exposed part of the driving device (4) and prevent rain or dust from entering. Align the clamping groove of the waterproof cover (47) with the buckle protrusion (471) of the housing (43) and press to buckle, so that the outer side of the housing (43) is completely sealed; for example, when the chicken house is washed with water pressure, the waterproof cover (47) can block the water flow from entering the driving device (4). Improve the waterproof and dustproof performance of the driving device (4) to adapt to humid environments; the buckle design facilitates regular cover maintenance of internal components.

[0042] Please attend Figures 1 to 8 In another embodiment, three balance bearings (5) are also included, the two side edges of the door body (1) are protrudingly provided with limiting edges (6), two of the balance bearings (5) are respectively arranged on the two sides of the door frame (2) and are horizontally aligned, and one of the balance bearings (5) is arranged in the groove (431), and the second gear (412) is sleeved with the balance bearing (5) arranged in the groove (431).

[0043] In the above embodiment, two horizontal alignment balance bearings (5) are fixed on both sides of the door frame member (2) for guiding the door body (1) to slide, and the limiting edge (6) clamps the balance bearing (5) when reaching the bottom, so that the door body (1) stops sliding; a third balance bearing (5) is additionally arranged in the groove (431), and the second gear (412) is sleeved on the outer ring of the bearing, so that when the motor (42) drives the first gear (411) and the second gear (412) to rotate, the bearing provides rotary support for the second gear (412) and simultaneously shares the radial load generated by the meshing of the gear row (312).

[0044] During the movement of the door body (1), the bearings along the door frame member (2) roll, and the bearings arranged in the groove simultaneously support the gear (412), so that the gear is prevented from being eccentric or worn due to excessive meshing force of the gear row (312).

[0045] Through the multi-bearing limiting design, the sliding friction resistance of the door body (1) is reduced, the service life of the moving part is prolonged, and at the same time, the door body (1) can always be in a balanced state during sliding and will not be deviated; the bearings arranged in the groove support the gear (412), so that the transmission stability is improved and the gear meshing misalignment is prevented.

[0046] Please participate ​ In another embodiment, a door opening magnet (7) and a door closing magnet (8) are arranged on the inner wall surface of the sliding groove (311), and a Hall sensor (9) is fixedly arranged on the shell (43).

[0047] In the above embodiment, the door opening magnet (7) and the door closing magnet (8) on the inner wall of the sliding groove (311) correspond to the fully open and fully closed positions of the door body (1) respectively; the Hall sensor (9) is fixed on the shell (43) and is horizontally aligned with the magnets, and when the door body (1) moves to the magnet sensing area, the sensor triggers a signal to the numerical control board (45) to control the motor (42) to stop running.

[0048] The door closing magnet (8) is installed on the top inner wall of the sliding groove (311), and the door opening magnet (7) is installed on the bottom inner wall; when the door body (1) moves to the closing end point, the Hall sensor (9) on the shell (43) senses the magnetic field signal of the door closing magnet (8), and the numerical control board (45) cuts off the power supply of the motor (42); similarly, when the door opening end point is sensed by the sensor, the motor stops.

[0049] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any skilled person in the art can make minor changes or modifications to the disclosed technical content without departing from the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. An automatic door opener for poultry, characterized in that The door body (1), the door frame (2), the first edge bar (31), the second edge bar (32) and the driving device (4) are included. The first edge bar (31) and the second edge bar (32) are symmetrically fixed on the left and right sides of the door frame (2), and the first edge bar (31) and the second edge bar (32) are provided with a sliding groove (311) extending along the length direction. The door body (1) is slidably embedded between the sliding grooves (311) of the first edge bar (31) and the second edge bar (32). The side of the first edge bar (31) is fixedly connected with a gear rack (312), the driving device (4) is fixed on the door body (1), the driving device (4) is provided with a gear structure (41) engaged with the gear rack (312), and the gear structure (41) is driven by a motor (42) to drive the door body (1) to move along the direction of the sliding groove (311).

2. The automatic door opener for poultry as claimed in claim 1 wherein, The driving device (4) further comprises a shell (43), a battery (44) and a numerical control board (45). The shell (43) is long strip-shaped and is fixed on one side of the door body (1). The left side area of the shell (43) is provided with a groove (431), and the gear structure (41) is located in the groove (431). The right side area of the shell (43) is provided with a clamping seat structure (46), the battery (44) is detachably installed in the shell (43) through the clamping seat structure (46), and the battery (44) is electrically connected with the motor (42).

3. The automatic poultry door according to claim 2, wherein, The gear structure (41) comprises a first gear (411) and a second gear (412). The first gear (411) is coaxially fixed on the output shaft of the motor (42), the second gear (412) is arranged in the axial direction perpendicular to the axial direction of the first gear (411), and the second gear (412) is engaged with the first gear (411) and the gear rack (312) respectively.

4. The automatic poultry door according to claim 2, wherein, The clamping seat structure (46) comprises oppositely arranged baffles (461) and adapter seats (462), the adapter seats (462) are provided with curved grooves (4621) accommodating the battery (44), and the baffles (461) are fixedly connected with limiting protrusions (4611) on the inner side of the curved grooves (4621).

5. The automatic poultry door according to claim 1, wherein, The inner side of the sliding groove (311) of the first edge bar (31) is provided with a wear-resistant bushing (3111), and the frame end of the door body (1) is embedded in the wear-resistant bushing (3111) for sliding.

6. The automatic poultry door according to claim 2, wherein, Threaded fixing holes (4311) are symmetrically arranged on both sides of the groove (431), and the motor (42) is fastened in the threaded fixing holes (4311) through bolts.

7. The automatic poultry door according to claim 3, wherein, The dedendum circle diameter of the second gear (412) is greater than the addendum circle diameter of the first gear (411), and the modulus of the second gear (412) is equal to the modulus of the gear rack (312).

8. The automatic poultry door according to claim 2, wherein, The outer side of the shell (43) is covered with a waterproof cover (47), and the waterproof cover (47) is detachably connected with the shell (43) through a buckle structure.

9. The automatic poultry door according to claim 3, wherein, Further comprising three balance bearings (5), two side edges of the door body (1) are provided with limiting edges (6), two of the balance bearings (5) are respectively arranged on the two sides of the door frame (2) and are horizontally aligned, and one of the balance bearings (5) is arranged in the groove (431), and the second gear (412) is sleeved with the balance bearing (5) arranged in the groove (431).

10. The automatic poultry door according to claim 1, wherein, Further comprising an opening door magnet (7), a closing door magnet (8) and a Hall sensor (9), the opening door magnet (7) and the closing door magnet (8) are arranged on the inner wall surface of the sliding groove (311), and the Hall sensor (9) is fixedly arranged on the shell (43).

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