Switch cabinet door mechanical interlocking device and locking method

Abstract

The invention discloses a switch cabinet door mechanical interlocking device and a locking method in the technical field of switch cabinets. The switch cabinet door mechanical interlocking device comprises an interlocking mechanism, a cabinet door locking mechanism and a cabinet door locking mechanism. A slidable interlocking transmission rod is elastically restrained in the interlocking mechanism; the cabinet door locking mechanism comprises a switching mechanism and a movably arranged locking plate, the interlocking transmission rod moves up and down to have a first position for limiting and fixing and a second position for extruding and contacting the switching mechanism, and the output end of the switching mechanism intermittently limits the locking plate; the cabinet door locking mechanism comprises a transmission piece capable of resetting and moving, a transmission supporting piece and a locking hook, the locking hook is rotationally installed on the transmission piece, and the transmission piece is connected with the locking plate; when in use, the switching mechanism is driven to limit the locking plate through the movement of the interlocking transmission rod, so that the moving piece is quickly released, the locking of the locking hook is released, the effective protection on misoperation is realized, and the equipment operation and personnel safety are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, in particular to a switch cabinet door mechanical interlocking device and locking method. BACKGROUND

[0002] In electrical equipment operation, misoperation (such as closing the grounding switch with live electricity, mistakenly entering the live compartment, etc.) is easy to cause arc fault, equipment damage and personnel casualty, etc. The core function of the switch cabinet door interlocking device is to prevent all kinds of misoperation through mechanical or electrical linkage mechanism. The traditional interlocking scheme (such as electromagnetic lock, program lock) has problems such as complex structure, high component cost, cumbersome operation process, etc., and when power failure occurs, it is necessary to find a power source for unlocking operation. The reliability of the traditional interlocking is not strong. With the upgrading of electrical equipment safety requirements, there is an urgent need for a switch cabinet door interlocking device with high reliability and controllable cost. SUMMARY

[0003] The purpose of the present application is to provide a switch cabinet door mechanical interlocking device and locking method to realize effective unlocking and locking through mechanical linkage and improve the reliability of mechanical interlocking.

[0004] To achieve the above-mentioned purpose, the present application is realized by adopting the following technical scheme: In a first aspect, the present application discloses a switch cabinet door mechanical interlocking device, which comprises an interlocking mechanism, a cabinet door locking mechanism and a cabinet door locking mechanism; The interlocking mechanism elastically constrains a slidable interlocking transmission rod; The cabinet door locking mechanism comprises a conversion mechanism and a movably arranged locking plate, the interlocking transmission rod moves up and down with a first position fixedly limited and a second position extruding and contacting the conversion mechanism, and the output end of the conversion mechanism intermittently limits the locking plate; The cabinet door locking mechanism comprises a resettable movable transmission member, a transmission support member and a locking hook, the locking hook is rotatably installed on the transmission member, the transmission member is connected to the locking plate, and the transmission member and the transmission support member are configured to make the transmission member move back and forth to make the locking hook switch the rotation direction synchronously.

[0005] When the interlocking transmission rod is in the second position, the conversion mechanism releases the locking plate, and the transmission member resets and unlocks.

[0006] Further scheme of the present application, the interlocking mechanism comprises a fixedly installed interlocking transmission mechanism, a circuit breaker operating mechanism and a work station operating mechanism; the output end of the work station operating mechanism is telescopically limited to the interlocking transmission mechanism, and the circuit breaker operating mechanism is used for power output guidance of the interlocking transmission mechanism.

[0007] Further, the interlocking transmission mechanism comprises a mobile interlocking transmission rod; The work station operating mechanism comprises a limiting base and a mobile limiting stopper, the limiting base is fixedly arranged, the interlocking transmission rod is indirectly arranged in a limiting groove of the limiting base, a baffle is rotatably arranged on the limiting base, one end of the baffle indirectly contacts the interlocking transmission rod, and the other end of the baffle intermittently contacts the limiting stopper, and a first tension spring is connected between the baffle and the limiting base.

[0008] Further, the conversion mechanism comprises a support seat, a driving plate and a driven plate; The support seat is fixed on the circuit breaker operating mechanism, the driving plate and the driven plate are relatively rotatably arranged on the support seat, a second tension spring is connected between the driving plate and the circuit breaker operating mechanism, one end of the interlocking transmission rod is hinged to the driving plate away from the driven plate, and a locking bolt is hinged to the other end of the driven plate away from the driving plate.

[0009] Further, the switch cabinet door mechanical interlocking device further comprises a fixed base, the locking plate is slidably connected to the fixed base, and the locking bolt passes through the fixed base and is arranged in a limiting hole arranged on the locking plate.

[0010] Further, a pair of through grooves are arranged in parallel on the locking plate, a bearing sleeve is arranged in each through groove, and a fastener fixedly connects the bearing sleeve and the locking plate.

[0011] Further, the cabinet door locking mechanism further comprises a guide transmission rod, a transmission connecting plate and a third tension spring, the transmission connecting plate and the guide transmission rod are fixedly connected, the guide transmission rod is fixedly connected to the locking plate, and the third tension spring connects the transmission connecting plate and the transmission member.

[0012] Further, the application further comprises a locking lock head, the locking lock head is fixed on one side of the cabinet door surface interlocking mechanism, the locking lock head is arranged corresponding to the transmission member, and a lock groove matched with the locking hook is arranged on the locking lock head.

[0013] Further, the transmission support member is an angle steel, a lap plate is fixed to the bottom of the transmission support member, and the locking hook contacts the lap plate.

[0014] In the second aspect, the application discloses a locking method based on the switch cabinet door mechanical interlocking device, which comprises When unlocking: the interlocking transmission rod is moved upward to be in the second position, the interlocking transmission rod drives the conversion mechanism to move, so that the output end of the conversion mechanism is moved upward, the conversion mechanism releases the limitation of the locking plate, the transmission member is reset and moved, and the locking hook releases the cabinet door; When the cabinet door is closed, the cabinet door moves to close, the cabinet door closing part extrudes and pushes the transmission member to move reversely, so that the locking plate resets, at the same time, the conversion mechanism resets, so that the locking plate repositions, the interlocking transmission rod is forced to move downward to reset and switch to the first position.

[0015] The application has the following beneficial effects: The switch cabinet door mechanical interlocking device designed in the application adopts a mechanical design principle, when in use, the movement of the interlocking transmission rod drives the conversion mechanism to limit the locking plate, so as to quickly release the moving member and release the locking of the locking hook, wherein the mechanical design principle is used to complete the manufacturing of the interlocking device by means of structural linkage relationship, the locking hook is quickly unlocked by the movement of the interlocking transmission rod, the structure is layer by layer related, and the drawbacks of traditional electromagnetic locks and programs are eliminated, the device has small maintenance difficulty, effectively protects the misoperation, and guarantees the equipment operation and personnel safety.

[0016] The transmission member and the transmission support member are slidingly installed, and the locking lock head is rotatably installed on the transmission member, the transmission support member is in surface contact, so that the transmission member moves under force, and the locking lock head rotates synchronously for locking work, when the transmission member resets, the locking lock head releases the unlocking by gravity, the design is ingenious, reduces the design difficulty, guarantees the synchronization of the device operation, and further improves the reliability and safety of the device. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a switch cabinet door mechanical interlocking device in an embodiment of the application; Figure 2 FIG. 2 is a structural schematic diagram of an interlocking mechanism in an embodiment of the application; Figure 3 FIG. 3 is a structural front schematic diagram of a locking mechanism in an embodiment of the application; Figure 4 FIG. 4 is a structural side schematic diagram of the locking mechanism in the embodiment of the application; Figure 5 FIG. 5 is a structural schematic diagram of a locking mechanism in an embodiment of the application; Figure 6 FIG. 6 is a schematic diagram of a part of the locking mechanism in an embodiment of the application; Figure 7 FIG. 7 is a schematic diagram of a locking head locking effect in an embodiment of the application.

[0018] Wherein: 1, interlocking mechanism; 2, cabinet door locking mechanism; 3, cabinet door locking mechanism; 110, interlocking transmission mechanism; 120, circuit breaker operating mechanism; 130, station operating mechanism; 140, gas tank shell; 111, interlocking transmission rod; 112, interlocking support; 113, operating lever; 121, guide shaft sleeve; 122, circuit breaker shell; 131, operating mechanism body; 132, limiting base; 133, baffle; 134, limiting stop; 135, first tension spring; 201, cylindrical connecting rod; 202, driving plate; 203, driven plate; 204, support seat; 205, machine body fixing plate; 206, locking bolt; 207, locking plate; 208, fixed base; 209, bearing sleeve; 210, second tension spring; 211, cabinet body; 301, guide transmission rod; 302, transmission connecting plate; 303, transmission member; 304, transmission support; 305, locking hook; 306, locking lock; 307, third tension spring; 308, cabinet door. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. The following description of at least one exemplary embodiment is actually only illustrative, not as any limitation on the present application and its application or use. Embodiment one

[0020] As shown in Figure 1 and Figure 2 , the present embodiment discloses a switch cabinet door mechanical interlocking device, which comprises an interlocking mechanism 1, a cabinet door locking mechanism 2 and a cabinet door locking mechanism 3; the interlocking mechanism 1 is elastically constrained with a slidable interlocking transmission rod 111; the cabinet door locking mechanism 2 comprises a conversion mechanism and a moving locking plate 207, the interlocking transmission rod 111 moves up and down with a first position limited fixed and a second position extruding and contacting the conversion mechanism, the output end of the conversion mechanism intermittently limits the locking plate 207; the cabinet door locking mechanism 3 comprises a resettable movable transmission member 303, a transmission support 304 and a locking hook 305, the locking hook 305 is rotatably installed on the transmission member 303, the transmission member 303 is connected with the locking plate 207, and the transmission member 303 and the transmission support 304 are configured to make the transmission member 303 move back and forth, so that the locking hook 305 synchronously switches the rotating direction; wherein, when the interlocking transmission rod 111 is in the second position, the conversion mechanism releases the locking plate 207, so that the transmission member 303 resets and unlocks.

[0021] During use, when unlocking: the interlocking transmission rod 111 is moved upward to the second position, the interlocking transmission rod 111 drives the conversion mechanism to move, causing the output end of the conversion mechanism to move upward, and the conversion mechanism releases the restriction of the locking plate 207; the transmission component 303 resets and moves, and the locking hook 305 releases and unlocks the cabinet door 308; When locked, cabinet door 308 moves to close, and the locking part of cabinet door 308 squeezes and pushes transmission component 303 to move in the opposite direction, so that locking plate 207 returns to its original position. At the same time, the conversion mechanism resets, so that locking plate 207 is re-limited, and interlock transmission rod 111 is forced to move down and reset to switch to the first position.

[0022] As attached Figures 1 to 7 As shown, in some embodiments the mechanical interlock device for opening and closing the cabinet door is designed as follows; As attached Figure 1 The device includes an interlocking mechanism 1, a cabinet door locking mechanism 2, and a cabinet door locking mechanism 3. The interlocking mechanism 1 is provided with an interlocking transmission rod 111, which is hinged to the cabinet door locking mechanism 2. The cabinet door locking mechanism 3 is provided with a guide transmission rod 301, one end of which is provided with a stud and fixedly connected to the cabinet door locking mechanism 2. The cabinet door locking mechanism 2 locks or unlocks the guide transmission rod 301, thereby realizing the locking or unlocking of the cabinet door locking mechanism 3.

[0023] As attached Figure 1 and Figure 2 As shown, in this embodiment, the interlocking mechanism 1 includes an interlocking transmission mechanism 110, a circuit breaker operating mechanism 120, a three-position operating mechanism 130, and a gas box housing 140; the three-position operating mechanism 130 and the circuit breaker operating mechanism 120 are fixedly installed on the gas box housing 140 in sequence; the interlocking transmission mechanism 110 is disposed between the circuit breaker operating mechanism 120 and the three-position operating mechanism 130. The interlocking transmission mechanism 110 includes an interlocking transmission rod 111, an interlocking support 112, and an operating lever 113; the circuit breaker operating mechanism 120 includes a guide sleeve 121 and a circuit breaker housing 122; the three-position operating mechanism 130 includes an operating mechanism body 131, a limiting base 132, a baffle 133, a limiting stop 134, and a first tension spring 135; wherein the guide sleeve 121 is coaxially fixedly arranged at the top and bottom of the circuit breaker housing 122, and the interlocking transmission rod 111 is slidably installed through the guide sleeve 121. One end of the interlocking transmission rod 111 is fixed to the interlocking support 112 by a stud, and the operating lever 113 is fixedly installed on the interlocking support 112; the interlocking support 112 is slidably installed in the limiting groove of the limiting base 132, the limiting base 132 is fixedly installed on the operating mechanism body 131, the baffle 133 is rotatably installed in the mounting groove of the limiting base 132, the first tension spring 135 is connected between the baffle 133 and the limiting base 132, and the limiting stop 134 is horizontally slidably installed on one side of the operating mechanism body 131; When the work station operating mechanism 130 is opened, the limiting stop 134 slides and contracts, and the restriction on the baffle 133 is removed. The work station operating mechanism 130 is a prior art, and thus is not described here. The operating lever 113 is lifted upward, the interlocking support 112 is moved upward, and the interlocking transmission rod 111 is moved upward. The interlocking support 112 touches the baffle 133, the baffle 133 is rotated, and the first tension spring 135 is stretched.

[0024] As shown in the accompanying Figures 3 to 5 The cabinet door locking mechanism 2 in the embodiment includes a cylindrical connecting rod 201, a driving plate 202, a driven plate 203, a support seat 204, a machine body fixing plate 205, a locking bolt 206, a locking plate 207, a fixed base 208, a bearing sleeve 209, a second tension spring 210, and a cabinet body 211. One end of the cylindrical connecting rod 201 is provided with a stud and is fixedly connected with a threaded hole at one end of the interlocking transmission rod 111. The driving plate 202 and the driven plate 203 are rotatably installed on the support seat 204. The support seat 204 and the machine body fixing plate 205 are fixedly connected as a whole by welding. The machine body fixing plate 205 is fixed on the circuit breaker housing 122. A bearing sleeve 209 is arranged between the driving plate 202 and the cylindrical connecting rod 201 and is connected by a screw rod. The second tension spring 210 is connected between the driving plate 202 and the machine body fixing plate 205. The opposite ends of the driving plate 202 and the driven plate 203 are provided with movable grooves. The other end of the driving plate 202 is also provided with a movable groove. A bearing sleeve 209 is arranged between the driving plate 202 and the driven plate 203 and is connected by a stud. The driven plate 203 and the locking bolt 206 are provided with a bearing sleeve 209 and are connected by a stud. A pair of through grooves are arranged in parallel on the locking plate 207. Bearing sleeves 209 are arranged in the through grooves. Fasteners connect the bearing sleeves 209 and the locking plate 207. The fixed base 208 is fixed on the cabinet body 211 by bolts. The fixed base 208 is provided with a guide hole. The locking bolt 206 contacts the fixed base 208 through the guide hole. The locking plate 207 is provided with a limiting hole. The locking bolt 206 passes through the limiting hole to block the sliding of the locking plate 207. In use, the interlocking transmission rod 111 is slid upward, the cylindrical connecting rod 201 is moved upward, the driving plate 202 is rotated clockwise, the second tension spring 210 is passively stretched to store energy, the driving plate 202 drives the driven plate 203 to rotate counterclockwise, the locking bolt 206 is lifted upward to be unlocked, and the locking plate 207 is slid under the driving of the third tension spring 307 to realize the unlocking of the cabinet door.

[0025] As shown in the accompanying Figure 6 and Figure 7The cabinet door locking mechanism 3 in the embodiment comprises a guide transmission rod 301, a transmission connecting plate 302, a transmission member 303, a transmission support 304, a locking hook 305, a locking lock head 306, a third tension spring 307 and a cabinet door 308. One end of the guide transmission rod 301 is fixedly connected with the transmission connecting plate 302 through a stud. The other end is fixedly connected with the locking plate 20. The transmission connecting plate 302 is fixedly connected with the transmission member 303 through a stud. The transmission support 304 is fixed on the cabinet body 211 through a screw, and the transmission support 304 is provided with a guide groove. The transmission member 303 is movably arranged in the guide groove. The third tension spring 307 is connected between the transmission member 303 and the transmission support 304. The transmission support 304 is fixedly installed on the cabinet body 211. The locking hook 305 is rotatably connected with the transmission support 304. The locking lock head 306 is fixed on the cabinet door 308. When the cabinet door is unlocked, the locking plate 207 is released from the constraint, the third tension spring 307 is stretched to store energy and released, the transmission connecting plate 302 is driven to slide, thereby driving the guide transmission rod 301 and the transmission member 303 to move. The guide transmission rod 301 drives the locking plate 207 to slide and unlock. The transmission member 303 drives the locking hook 305 to rotate and disengage from the locking lock head 306. The cabinet door 308 is unlocked and opened. In the embodiment, the transmission support 304 is an angle steel. The bottom of the transmission support 304 is fixed with a lap plate. The locking hook 305 contacts the lap plate. The guide transmission rod 301 moves to the left. The locking hook 305 and the lap plate act to rotate counterclockwise, and lock the locking lock head 306. Embodiment two

[0026] The embodiment discloses a locking method based on the mechanical interlocking device for opening and closing the cabinet door in the above embodiment. The locking method comprises the following steps. The cabinet door unlocking example: at this time, the three-station operating mechanism 130 starts to retract the limiting stopper 134. At this time, the worker pulls up the operating lever 113. The interlocking support 112 touches the baffle 133, so that the baffle 133 rotates and stretches the first tension spring 135. The interlocking transmission rod 111 presses the driving plate 201. The driving plate 201 rotates and stretches the second tension spring 210. At the same time, the locking bolt 206 moves upward, and the locking of the locking plate 207 is released. Finally, under the pulling of the third tension spring 307, the locking plate 207, the guide transmission rod 301, the transmission member 303 and other parts move towards the cabinet door 308, so as to release the locking of the locking hook 305 on the locking lock head 306, and the cabinet door unlocking is completed.

[0027] The cabinet door locking example: the cabinet door 308 is manually closed, the lock head 306 is pushed inwards by the driving member 303, the driving member 303 drives the locking hook 305 to rotate, and the driving connection plate 302 is driven to slide away from the cabinet door 308, the guiding driving rod 301 is pushed to move by the driving connection plate 302, the locking plate 207 is pushed by the guiding driving rod 301, after the locking plate 207 slides for a distance, the limiting hole of the locking plate 207 is matched with the movement of the locking pin 206, the limiting tension spring 210 releases energy to drive the driving plate 202 to rotate counterclockwise, and the driven plate 203 rotates clockwise, the locking pin 206 passes through the limiting hole to limit the sliding of the locking plate 207, and the locking operation is completed; during this period, the driving plate 202 rotates to drive the cylindrical connecting rod 201 and the interlocking driving rod 111 to move downwards, and the interlocking support 112 moves downwards, the limiting tension spring 135 releases energy storage and pulls the baffle 133 to rotate counterclockwise, the three-position operating mechanism 130 is started to extend the limiting stop piece 134, and the cabinet door interlocking locking is completed.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0029] In the description of the present application, it should be noted 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; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A mechanical interlocking device for a switch cabinet door, characterized in that, It includes an interlocking mechanism (1), a cabinet door locking mechanism (2), and a cabinet door locking mechanism (3); The interlocking mechanism (1) has an elastically constrained sliding interlocking transmission rod (111). The cabinet door locking mechanism (2) includes a conversion mechanism and a movable locking plate (207). The interlocking transmission rod (111) moves up and down and has a first position with a fixed limit and a second position with a pressing contact with the conversion mechanism. The output end of the conversion mechanism intermittently limits the locking plate (207). The cabinet door locking mechanism (3) includes a resettable transmission component (303), a transmission support component (304), and a locking hook (305). The locking hook (305) is rotatably mounted on the transmission component (303). The transmission component (303) is connected to the locking plate (207). The transmission component (303) and the transmission support component (304) are configured such that the transmission component (303) moves back and forth, causing the locking hook (305) to switch rotation directions synchronously. When the interlocking transmission rod (111) is in the second position, the conversion mechanism releases the locking plate (207), causing the transmission component (303) to reset and unlock.

2. The mechanical interlocking device for the switch cabinet door according to claim 1, characterized in that, The interlocking mechanism (1) includes a fixedly installed interlocking transmission mechanism (110), a circuit breaker operating mechanism (120), and a workstation operating mechanism (130); the output end of the workstation operating mechanism (130) extends and limits the interlocking transmission mechanism (110), and the circuit breaker operating mechanism (120) is used to guide the power output of the interlocking transmission mechanism (110).

3. The mechanical interlocking device for the switch cabinet door according to claim 2, characterized in that, The interlocking transmission mechanism (110) includes a movable interlocking transmission rod (111). The workstation operating mechanism (130) includes a limiting base (132) and a movable limiting stop (134). The limiting base (132) is fixedly installed. The interlocking transmission rod (111) is indirectly placed in the limiting groove of the limiting base (132). A baffle (133) is rotatably installed on the limiting base (132). One end of the baffle (133) indirectly contacts the interlocking transmission rod (111), and the other end intermittently contacts the limiting stop (134). A first tension spring (135) is connected between the baffle (133) and the limiting base (132).

4. The mechanical interlocking device for the switch cabinet door according to claim 1, characterized in that, The conversion mechanism includes a support base (204), a drive plate (202), and a driven plate (203); The support base (204) is fixed on the circuit breaker operating mechanism (120). The drive plate (202) and the driven plate (203) are rotatably mounted on the support base (204). A second tension spring (210) is connected between the drive plate (202) and the circuit breaker operating mechanism (120). The interlocking transmission rod (111) is hinged to the end of the drive plate (202) away from the driven plate (203). A locking pin (206) is hinged to the end of the driven plate (203) away from the drive plate (202).

5. The mechanical interlocking device for the switch cabinet door according to claim 4, characterized in that, The mechanical interlocking device for the switch cabinet door also includes a fixed base (208), the locking plate (207) is slidably connected to the fixed base (208), and the locking pin (206) passes through the fixed base (208) and is placed in a limiting hole provided on the locking plate (207).

6. The mechanical interlocking device for the switch cabinet door according to claim 5, characterized in that, A pair of through slots are arranged in parallel on the locking plate (207), and a bearing sleeve (209) is provided in the through slot. Fasteners are used to fix the bearing sleeve (209) and the locking plate (207).

7. The mechanical interlocking device for the switch cabinet door according to claim 1, characterized in that, The cabinet door locking mechanism (3) further includes a guide transmission rod (301), a transmission connecting plate (302), and a third tension spring (307). The transmission connecting plate (302) and the guide transmission rod (301) are fixedly connected. The guide transmission rod (301) is fixedly connected to the locking plate (207). The third tension spring (307) connects the transmission connecting plate (302) and the transmission component (303).

8. The mechanical interlocking device for the switch cabinet door according to claim 1, characterized in that, It also includes a locking head (306), which is fixed on one side of the cabinet door connecting locking mechanism (1). The locking head (306) is set in relation to the transmission component (303), and the locking head (306) is provided with a locking groove that matches the locking hook (305).

9. The mechanical interlocking device for the switch cabinet door according to claim 1, characterized in that, The transmission support (304) is in the shape of angle steel, and a lap plate is fixed at the bottom of the transmission support (304), and the locking hook (305) contacts the lap plate.

10. A locking method based on the mechanical interlocking device for a switch cabinet door according to any one of claims 1 to 9, characterized in that, include When unlocking: the interlocking transmission rod (111) is moved upward to the second position, the interlocking transmission rod (111) drives the conversion mechanism to move, so that the output end of the conversion mechanism moves upward, and the conversion mechanism releases the restriction of the locking plate (207); the transmission component (303) resets and moves, and the locking hook (305) releases and unlocks the cabinet door; When locked, the cabinet door moves to close, and the locking part of the cabinet door squeezes and pushes the transmission component (303) to move in the opposite direction, so that the locking plate (207) returns to its original position. At the same time, the conversion mechanism resets, so that the locking plate (207) is repositioned, and the interlocking transmission rod (111) is forced to move down and reset to the first position.

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