Push rod actuator with static retention force and working method

Abstract

The invention provides a push rod actuator with static retention force, which comprises a first shell and a second shell, and openings of the first shell and the second shell are oppositely connected. The bottom face of the second shell is slidably connected with a rack, the rack is in driving connection with a driving motor, the driving motor is clamped between the first shell and the second shell, and the driving motor drives the rack to move in a reciprocating mode. The rack is provided with a locking mechanism, the locking mechanism is connected with the first shell, and the locking mechanism locks the rack. The locking mechanism comprises a thrust device and a locking block, the thrust device is in driving connection with the locking block, and the thrust device drives the locking block to move so that the locking block can be connected with the rack in a clamped mode. The door body can be prevented from being automatically closed due to the influence of self weight and the hinge spring, people are prevented from being pinched, safety is improved, space is provided for a user to open the door body, and operation convenience is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of actuators, and in particular relates to a push rod actuator with static holding force and a working method. Background Art

[0002] As high-end home appliances are developing towards intelligence and integration, automatic door opening and closing actuators are widely used in various high-end smart home appliance applications, and door handles are gradually being eliminated. Push rod actuators are a common solution. Push rod actuators push the door body open, so that the door body is in a set position and keeps it for a few seconds, making it easy for users to open the door body. Existing push rod actuators usually rely on the self-locking force of the reduction motor itself to overcome the heavy closing force generated by the weight of the door body and the internal spring of the hinge to keep the door body in place. However, when the actuator is powered off and the self-locking force of the reduction motor cannot overcome the weight of the door body and the closing force generated by the spring, the door body will automatically close, posing a risk of pinching, hindering user operation, and affecting the safety and convenience of use.

[0003] Therefore, the above problems need to be solved urgently. Summary of the invention

[0004] Purpose of the invention: In order to overcome the above-mentioned deficiencies, the present invention provides a push rod actuator with static holding force and a working method, which can provide sufficient static holding force to overcome the deadweight of the door body and the closing force generated by the spring, reduce the risk of users being pinched, and improve the convenience of operation.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a push rod actuator with static holding force, including a first shell and a second shell, and the first shell and the second shell are relatively connected by openings. The bottom surface of the second shell is slidably connected with a rack, and the rack is driven and connected with a driving motor, and the driving motor is clamped between the first shell and the second shell, and the driving motor drives the rack to reciprocate. The rack is provided with a locking mechanism, and the locking mechanism is connected to the first shell, and the locking mechanism locks the rack. The locking mechanism includes a thrust device and a locking block, and the thrust device and the locking block are drivingly connected. The thrust device drives the locking block to move, so that the locking block and the rack are clamped. During use, the driving motor drives the rack to extend out of the opening provided in the first shell and the second shell, and the rack pushes the door body to open, and then the thrust device pushes the locking block to move, so that the locking block and the rack are clamped, and the locking block locks the rack, thereby preventing the door body from automatically closing due to the influence of its own weight and the hinge spring, avoiding people from being pinched, improving safety, providing space for users to open the door body, and improving the convenience of operation.

[0006] Furthermore, in the above-mentioned push rod actuator with static holding force, the locking block is set as a triangular wedge block, the long side of the locking block is arranged close to the rack, and the long side of the locking block is provided with a tooth portion corresponding to the rack. A through groove is provided on the short side of the locking block away from the thrust device, and the through groove is arranged obliquely along the short side. The locking block is connected to the first shell at an angle away from the through groove, and a driving shaft is passed through the through groove. The driving shaft and the thrust device are drivingly connected, and the thrust device pushes the driving shaft to move along the through groove. The thrust device pulls the driving shaft to move toward the thrust device, and the driving shaft moves along the through groove toward the highest point of the locking block. The locking block moves downward away from an angle of the thrust device, and the tooth portion provided on the locking block is pressed against the rack, thereby limiting the movement of the rack and locking the rack. By locking the rack through the triangular locking block, the thrust device and the locking block can be arranged parallel to the rack, which can reduce the height of the push rod actuator and improve space utilization.

[0007] Furthermore, in the above-mentioned push rod actuator with static holding force, the thrust device includes an electromagnet, and the electromagnet is set as a power-off self-holding electromagnet. The electromagnet is slidably connected with an armature, and the armature sleeve is provided with a spring, and the armature is connected to the drive shaft. The drive shaft is slidably connected to the waist hole provided in the first shell, and the long axis of the waist hole is horizontally arranged. When the electromagnet loses power, the electromagnet is magnetized, the electromagnet drives the armature to move in the direction of the electromagnet, the armature drives the drive shaft to move in the direction of the electromagnet, and drives the locking block away from the end of the electromagnet to move downward, the locking block and the rack are engaged, and the armature squeezes the spring. When the electromagnet is powered on, the electromagnet is demagnetized, the spring pushes the armature to move away from the electromagnet, the electromagnet, the armature lifts the locking block away from the end of the electromagnet, separates and unlocks the locking block and the rack, and the rack can move. The above design ensures that when the thrust actuator is powered off, the locking block locks the rack, avoids the actuator power failure, resulting in insufficient self-locking force of the motor, ensures that the door body is in the original position, avoids the door body automatically closing, and improves the convenience and safety of operation.

[0008] Furthermore, in the above-mentioned push rod actuator with static holding force, the rack is provided with a notch, the notch is provided on the side of the rack close to the driving motor, and the notch includes an opening direction notch and a closing direction notch. Two opening direction notches are provided, and the opening direction notch is provided at one end of the rack close to the thrust device. The closing direction notch is provided at one end of the rack away from the thrust device. The second housing is connected with a limit switch, and two limit switches are provided, and the limit switches are provided on both sides of the driving motor, and the two limit switches and the two opening direction notches are provided correspondingly. When the rack extends to push the door body open, the two limit switches are both embedded in the opening direction notch, and at this time the door body is opened in place, the two limit switches are disconnected at the same time, the control system receives the two limit switch disconnection signals, and the control system controls the drive motor to stop rotating. When the rack is retracted between the first housing and the second housing, the limit switch provided on the side of the driving motor away from the thrust device is disconnected, and the limit switch on the other side is closed, the control system receives the limit switch opening signal and the care signal, and the control system controls the drive motor to stop rotating, thereby realizing the automatic control of the push rod actuator and improving the automation of the push rod actuator.

[0009] Furthermore, in the above-mentioned push rod actuator with static holding force, the driving motor and the rack are arranged in a cross shape, and the driving motor is connected to a gear shaft, which is rotatably connected between the first shell and the second shell, and the gear shaft is meshed with the rack at one end away from the driving motor. The driving motor drives the rack to move through the gear shaft, converting the rotational motion of the motor into the linear motion of the rack. The structure is simple and maintenance is convenient. By controlling the speed and direction of the motor, the moving speed and direction of the rack can be accurately controlled, thereby improving the control accuracy of the push rod actuator. Furthermore, in the above push rod actuator with static holding force, the rack is provided with double rows of teeth. The double rows of racks can improve the bearing capacity and mechanical strength of the rack, meet the needs of opening and closing the door body, and the double rows of racks can reduce wear and increase the life of the actuator.

[0010] Furthermore, in the above push rod actuator with static holding force, a flexible block is provided at one end of the rack away from the locking mechanism. When the rack pushes the door body, the flexible block first contacts the door body, so that the rigid contact between the rack and the door body becomes a flexible contact, which can reduce the door opening noise, reduce wear and tear, and increase the service life.

[0011] Furthermore, in the above-mentioned push rod actuator with static holding force, the gear shaft includes a connecting portion, a first limiting portion, a second limiting portion, and a meshing portion, the connecting portion, the first limiting portion, the second limiting portion, and the meshing portion are coaxially connected in sequence, the connecting portion is drivingly connected to the motor shaft of the driving motor, the first limiting portion and the second limiting portion are clamped on both sides of the protrusion provided on the second housing, the meshing portion is provided with teeth along the side wall, and the meshing portion is meshed with the rack. The above-mentioned structural design can improve the stability of the gear shaft, reduce the axial movement of the gear shaft, and improve the stability of the actuator.

[0012] Furthermore, in the above push rod actuator with static holding force, the second housing is provided with a locking ear, which is arranged along the bottom of the second housing. The push rod actuator is fixed by the locking ear, and the locking ear arranged along the bottom of the second housing can improve the stability of the connection of the push rod actuator.

[0013] A working method for the above-mentioned push rod actuator with static holding force comprises the following steps: S1: The electromagnet is powered on, the electromagnet is demagnetized, the spring pushes the armature to move away from the electromagnet, the armature drives the drive shaft to move toward the electromagnet, the spring returns to its original position, and the locking block and the rack are separated; S2: The driving motor drives the rack to extend through the gear shaft; S3: The two limit switches are respectively inserted into the opening direction slots, and the drive motor stops; S4: The electromagnet is powered off, the electromagnet is magnetized, the electromagnet drives the driving shaft to move toward the electromagnet, and the spring is squeezed and deformed; the driving shaft slides to the end of the through slot close to the electromagnet, the locking block and the rack engage, so that the door body is kept in place; S5: The electromagnet is powered on, the electromagnet is demagnetized, the spring pushes the armature to move away from the electromagnet, the armature drives the driving shaft to move in the direction of the electromagnet, the spring returns to its original position, and the locking block and the rack are separated; S6: The driving motor flips over and drives the rack to retract through the gear shaft; S7: The limit switch is inserted into the closing direction slot, the electromagnet is powered off, the electromagnet is magnetized, the electromagnet drives the driving shaft to move toward the electromagnet, and the spring is squeezed and deformed; the driving shaft slides to the end of the through slot close to the electromagnet, the locking block and the rack engage to lock the door body.

[0014] It can be seen from the above technical scheme that the present invention has the following beneficial effects: the push rod actuator with static holding force of the present invention locks the rack by clamping the locking block and the rack, which can prevent the door body from automatically closing due to its own weight and hinge spring, avoid people from being pinched, improve safety, provide space for users to open the door body, and improve the convenience of operation. By locking the rack with a triangular locking block, the thrust device and the locking block can be set parallel to the rack, which can reduce the height of the push rod actuator and improve space utilization. The use of a power-off self-holding electromagnet can prevent the actuator from being powered off. Due to insufficient self-locking force of the motor, the door body automatically closes, improving the convenience and safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a push rod actuator with static holding force according to the present invention; Figure 2 It is an internal schematic diagram of a push rod actuator with static holding force of the present invention; Figure 3is a schematic structural diagram of the thrust device; Figure 4 It is an internal front view of the present invention; Figure 5 It is a front view of the gear shaft.

[0016] In the figure: 1, first shell, 2, second shell, 21, rack, 211, notch, 2111, opening direction notch, 2112, closing direction notch, 22, driving motor, 23, locking mechanism, 231, thrust device, 2311, electromagnet, 2312, armature, 2313, spring, 232, locking block, 2321, through groove, 2322, driving shaft, 24, limit switch, 25, gear shaft, 251, connecting part, 252, first limiting part, 253, second limiting part, 254, meshing part, 26, flexible block, 27, locking ear. DETAILED DESCRIPTION

[0017] Example 1 like Figure 1-2 A push rod actuator with static holding force shown in the figure comprises a first housing 1 and a second housing 2, and the first housing 1 and the second housing 2 are connected with openings relative to each other. A rack 21 is slidably connected to the bottom surface of the second housing 2, and the rack 21 is driven and connected to a driving motor 22, and the driving motor 22 is clamped between the first housing 1 and the second housing 2, and the driving motor 22 drives the rack 21 to reciprocate. The rack 21 is provided with a locking mechanism 23, and the locking mechanism 23 is connected to the first housing 1, and the locking mechanism 23 locks the rack 21. The locking mechanism 23 comprises a thrust device 231 and a locking block 232, and the thrust device 231 is driven and connected to the locking block 232, and the thrust device 231 drives the locking block 232 to move, so that the locking block 232 and the rack 21 are clamped. The driving motor 22 and the rack 21 are arranged in a cross, and the driving motor 22 is driven and connected to a gear shaft 25, and the gear shaft 25 is rotatably connected between the first housing 1 and the second housing 2, and the gear shaft 25 is meshed with the rack 21 at one end away from the driving motor 22. The rack 21 is provided with double rows of teeth. A flexible block 26 is provided at one end of the rack 21 away from the locking mechanism 23. The second housing 2 is provided with a locking ear 27, which is arranged along the bottom of the second housing 2.

[0018] During use, the driving motor 22 drives the rack 21 to extend out of the openings provided in the first shell 1 and the second shell 2, the rack 21 pushes the door body to open, and then the thrust device 231 pushes the locking block 232 to move, so that the locking block 232 and the rack 21 are engaged, and the locking block 232 locks the rack 21.

[0019] like Figure 3In the push rod actuator with static holding force shown in the figure, the locking block 232 is set as a triangular wedge block, the long side of the locking block 232 is arranged close to the rack 21, and the long side of the locking block 232 is provided with a tooth portion corresponding to the rack 21. The short side of the locking block 232 away from the thrust device 231 is provided with a through groove 2321, and the through groove 2321 is inclined along the short side. The locking block 232 is connected to the first housing 1 at an angle away from the through groove 2321, and a driving shaft 2322 is inserted into the through groove 2321. The driving shaft 2322 is drivingly connected to the thrust device 231, and the thrust device 231 pushes the driving shaft 2322 to move along the through groove 2321. The thrust device 231 pulls the drive shaft 2322 to move toward the thrust device 231, and the drive shaft 2322 moves along the through slot 2321 toward the highest point of the locking block 232, and the locking block 232 moves downward away from a corner of the thrust device 231, and the toothed portion provided on the locking block 232 is pressed against the rack 21, thereby limiting the movement of the rack 21 and locking the rack 21. The thrust device 231 includes an electromagnet 2311, and the electromagnet 2311 is configured as a power-off self-holding electromagnet. The electromagnet 2311 is slidably connected to an armature 2312, and the armature 2312 is sleeved with a spring 2313, and the armature 2312 is connected to the drive shaft 2322. The drive shaft 2322 is slidably connected to the waist hole provided on the first housing 1, and the long axis of the waist hole is horizontally arranged.

[0020] When the electromagnet 2311 is powered on, the electromagnet 2311 is demagnetized, the spring 2313 pushes the armature 2312 to move away from the electromagnet 2311, the spring 2313 recovers, the armature 2312 lifts the end of the locking block 232 away from the electromagnet 2311, separates the locking block 232 from the rack 21 and unlocks it, so that the rack 21 can move. When the electromagnet 2311 loses power, the electromagnet 2311 is magnetized, the electromagnet 2311 drives the armature 2312 to move in the direction of the electromagnet 2311, the armature 2312 drives the drive shaft 2322 to move in the direction of the electromagnet 2311, drives the locking block 232 away from the end of the electromagnet 2311 to move downward, the locking block 232 and the rack bite, and the armature 2312 squeezes the spring 2313.

[0021] like Figure 4The push rod actuator with static holding force shown in the figure has a rack 21 with a notch 211, which is arranged on the side of the rack 21 close to the driving motor 22, and the notch 211 includes an opening direction notch 2111 and a closing direction notch 2112. There are two opening direction notches 2111, and the opening direction notch 2111 is arranged at the end of the rack 21 close to the thrust device 231. The closing direction notch 2112 is arranged at the end of the rack 21 away from the thrust device 231. The second housing 2 is connected to a limit switch 24, and there are two limit switches 24, which are arranged on both sides of the driving motor 22, and the two limit switches 24 and the two opening direction notches 2111 are arranged correspondingly. When the rack 21 extends to push the door body open, the two limit switches 24 are both embedded in the opening direction notches 21111, and at this time the door body is opened in place, and the two limit switches 24 are disconnected at the same time. The control system receives the disconnection signals of the two limit switches 24, and the control system controls to stop the driving motor 22 to stop rotating. When the rack 21 retracts between the first shell 1 and the second shell 2, the limit switch 24 on the side of the drive motor 22 away from the thrust device 231 is disconnected, and the limit switch 24 on the other side is closed. The control system receives the open signal and the care signal of the limit switch 24, and the control system controls the drive motor 22 to stop rotating, thereby realizing automatic control of the push rod actuator and improving the automation of the push rod actuator.

[0022] like Figure 5 The push rod actuator with static holding force shown in the figure, the gear shaft 25 includes a connecting part 251, a first limiting part 252, a second limiting part 253, and an engaging part 254. The connecting part 251, the first limiting part 252, the second limiting part 253, and the engaging part 254 are coaxially and integrally connected in sequence. The connecting part 251 is driven and connected to the motor shaft of the driving motor 22. The first limiting part 252 and the second limiting part 253 are respectively clamped on both sides of the protrusion provided on the second shell 2. The engaging part 254 is provided with teeth along the side wall, and the engaging part 254 is meshed with the rack 21.

[0023] A working method for the above-mentioned push rod actuator with static holding force comprises the following steps: S1: The electromagnet 2311 is powered on, the electromagnet 2311 is demagnetized, the spring 2313 pushes the armature 2312 to move away from the electromagnet 2311, the armature 2312 drives the drive shaft 2322 to move toward the electromagnet 2311, the spring 2313 recovers, and the locking block 232 and the rack 21 are separated; S2: The driving motor 22 drives the rack 21 to extend through the gear shaft 25; S3: The two limit switches 24 are respectively inserted into the opening direction slots 2111, and the drive motor 22 stops; S4: The electromagnet 2311 is powered off, the electromagnet 2311 is magnetized, the electromagnet 2311 drives the drive shaft 2322 to move toward the electromagnet 2311, and the spring 2313 is squeezed and deformed; the drive shaft 2322 slides to the end of the through slot 2321 close to the electromagnet 2311, and the locking block 232 and the rack 21 are engaged to keep the door in place; S5: The electromagnet 2311 is powered on, the electromagnet 2311 is demagnetized, the spring 2313 pushes the armature 2312 to move away from the electromagnet 2311, the armature 2312 drives the drive shaft 2322 to move toward the electromagnet 2311, the spring 2313 is restored, and the locking block 232 and the rack 21 are separated; S6: The driving motor 22 flips over, and the driving motor 22 drives the rack 21 to retract through the gear shaft 25; S7: The limit switch 24 is inserted into the closing direction slot 2112, the electromagnet 2311 is powered off, the electromagnet 2311 is magnetized, the electromagnet 2311 drives the drive shaft 2322 to move toward the electromagnet 2311, and the spring 2313 is squeezed and deformed; the drive shaft 2322 slides to the end of the through slot 2321 close to the electromagnet 2311, the locking block 232 and the rack 21 engage to lock the door body.

[0024] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with this field can understand the content of the present invention and implement it accordingly, and they cannot limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A push rod actuator with static holding force, characterized in that: The invention comprises a first shell (1) and a second shell (2), wherein the first shell (1) and the second shell (2) are connected with each other through openings; a rack (21) is slidably connected to the bottom surface of the second shell (2); the rack (21) is drivably connected to a drive motor (22); the drive motor (22) is clamped between the first shell (1) and the second shell (2); the drive motor (22) drives the rack (21) to move back and forth; the rack (21) is provided with a locking mechanism (23); the locking mechanism (23) is connected to the first shell (1); the locking mechanism (23) locks the rack (21); the locking mechanism (23) comprises a thrust device (231) and a locking block (232); the thrust device (231) and the locking block (232) are drivably connected; the thrust device (231) drives the locking block (232) to move, so that the locking block (232) and the rack (21) are clamped.

2. The push rod actuator with static holding force according to claim 1, characterized in that: The locking block (232) is configured as a triangular wedge block, the long side of the locking block (232) is arranged close to the rack (21), and the long side of the locking block (232) is provided with a tooth portion corresponding to the rack (21); the short side of the locking block (232) away from the thrust device (231) is provided with a through groove (2321), the through groove (2321) is arranged obliquely along the short side, the locking block (232) is connected to the first housing (1) at an angle away from the through groove (2321), a driving shaft (2322) is passed through the through groove (2321), the driving shaft (2322) and the thrust device (231) are drivingly connected, and the thrust device (231) pushes the driving shaft (2322) to move along the through groove (2321).

3. The push rod actuator with static holding force according to claim 2, characterized in that: The thrust device (231) comprises an electromagnet (2311), the electromagnet (2311) being a power-off self-holding electromagnet, the electromagnet (2311) being slidably connected to an armature (2312), the armature (2312) being sleeved with a spring (2313), the armature (2312) being connected to a drive shaft (2322); the drive shaft (2322) being slidably connected to a waist hole provided in the first housing (1); when the electromagnet (2311) loses power, the electromagnet (2311) drives the armature (2312) to move in the direction of the electromagnet (2311), and the armature (2312) squeezes the spring (2313); when the electromagnet (2311) is powered on, the spring (2313) is restored, and the spring (2313) pushes the armature (2312) to move in a direction away from the electromagnet (2311).

4. The push rod actuator with static holding force according to claim 1, characterized in that: The rack (21) is provided with a notch (211), the notch (211) being provided on a side of the rack (21) close to the drive motor (22), the notch (211) comprising an opening direction notch (2111) and a closing direction notch (2112); two opening direction notches (2111) are provided, the opening direction notch (2111) being provided on an end of the rack (21) close to the thrust device (231), and the closing direction notch (2112) being provided on an end of the rack (21) away from the thrust device (231); the second housing (2) is connected to a limit switch (24), two limit switches (24) are provided, the two limit switches (24) are provided on both sides of the drive motor (22), and the two limit switches (24) and the two opening direction notches (2111) are provided correspondingly.

5. The push rod actuator with static holding force according to claim 1, characterized in that: The drive motor (22) and the rack (21) are arranged in a cross-shaped manner; the drive motor (22) is drivingly connected to a gear shaft (25); the gear shaft (25) is rotatably connected between the first housing (1) and the second housing (2); and one end of the gear shaft (25) away from the drive motor (22) is meshed with the rack (21).

6. The push rod actuator with static holding force according to claim 1, characterized in that: The rack (21) is provided with double rows of teeth.

7. The push rod actuator with static holding force according to claim 1, characterized in that: A flexible block (26) is provided at one end of the rack (21) away from the locking mechanism (23).

8. The push rod actuator with static holding force according to claim 5, characterized in that: The gear shaft (25) comprises a connecting portion (251), a first limiting portion (252), a second limiting portion (253), and a meshing portion (254); the connecting portion (251), the first limiting portion (252), the second limiting portion (253), and the meshing portion (254) are coaxially connected in sequence; the connecting portion (251) is drivingly connected to a motor shaft of a driving motor (22); the first limiting portion (252) and the second limiting portion (253) are respectively clamped on both sides of a protrusion provided on the second housing (2); the meshing portion (254) is provided with teeth along a side wall; and the meshing portion (254) meshes with the rack (21).

9. The push rod actuator with static holding force according to claim 1, characterized in that: The second shell (2) is provided with a locking ear (27), and the locking ear (27) is arranged along the bottom of the second shell (2).

10. A method for operating a push rod actuator with static holding force, characterized in that: The following steps are involved: S1: the electromagnet (2311) is powered on, the electromagnet (2311) is demagnetized, the spring (2313) pushes the armature (2312) to move away from the electromagnet (2311), the armature (2312) drives the drive shaft (2322) to move in the direction of the electromagnet (2311), the spring (2313) is restored, and the locking block (232) and the rack (21) are separated; S2: the driving motor (22) drives the rack (21) to extend through the gear shaft (25); S3: The two limit switches (24) are respectively inserted into the opening direction slots (2111), and the drive motor (22) stops; S4: the electromagnet (2311) is powered off, the electromagnet (2311) is magnetized, the electromagnet (2311) drives the drive shaft (2322) to move in a direction close to the electromagnet (2311), and the spring (2313) is squeezed and deformed; the drive shaft (2322) slides to one end of the through slot (2321) close to the electromagnet (2311), and the locking block (232) and the rack (21) are meshed to keep the door body in place; S5: the electromagnet (2311) is powered on, the electromagnet (2311) is demagnetized, the spring (2313) pushes the armature (2312) to move away from the electromagnet (2311), the armature (2312) drives the drive shaft (2322) to move in the direction of the electromagnet (2311), the spring (2313) is restored, and the locking block (232) and the rack (21) are separated; S6: the drive motor (22) turns over, and the drive motor (22) drives the rack (21) to retract via the gear shaft (25); S7: The limit switch (24) is inserted into the closing direction slot (2112), the electromagnet (2311) is powered off, the electromagnet (2311) is magnetized, the electromagnet (2311) drives the drive shaft (2322) to move toward the electromagnet (2311), and the spring (2313) is squeezed and deformed; the drive shaft (2322) slides to the end of the through slot (2321) close to the electromagnet (2311), and the locking block (232) and the rack (21) are engaged to lock the door body.

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