Knife switch capable of preventing misoperation

Abstract

The utility model discloses a knife switch capable of preventing misoperation. The knife switch comprises a base, a contact knife and an automatic telescopic device, a static contact is arranged on the base; the contact knife is hinged with the base, rotates to the static contact to electrify the knife switch, and leaves the static contact to disconnect the knife switch; a locking piece is arranged on the contact knife, and the locking piece is arranged along the moving direction of the contact knife; locking holes are respectively formed in two ends of the locking piece; in response to the condition that the load of the knife switch circuit meets a preset range, the automatic telescopic device extends out of the locking pin and inserts the locking pin into the locking hole to restrain the contact knife to keep a switched-off or switched-on state; or the locking pin is contracted to leave from the locking hole, so that the contact knife freely rotates. And manual switching-on or switching-off operation in an unsafe state is prevented, so that the arc discharge risk caused by misoperation is thoroughly avoided, and stable operation of an electrical system and the safety of operators are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a knife switch capable of preventing misoperation. Background Art

[0002] In the field of power systems and industrial automation, knife switches, as a basic electrical control component, are widely used, especially in power supply and distribution systems, control circuits, and the start-stop control of various electrical equipment. However, although the design of knife switches clearly states that they do not have the ability to operate with current, that is, they should be closed and opened under no-load or very low-load conditions, in actual application scenarios, due to operator negligence, misoperation, or insufficient understanding of equipment performance, the operator may still manually close or open the switch with load. In this case, if the current in the circuit is large, especially when it approaches or exceeds the rated current carrying capacity of the knife switch, it will cause safety problems.

[0003] Specifically, when operating a knife switch under load, the rapid separation or closing of the contacts creates an arc, leading to the so-called "arcing phenomenon." Arcing not only generates extremely high temperatures and energy in a short period of time, but also causes severe thermal damage to the knife switch's contact materials and can even directly burn the contacts, affecting the normal operation and lifespan of the equipment. More seriously, if arcing occurs near operators without effective protection, the high-temperature arc can directly cause harm to the human body, such as arc burns, threatening the operator's life.

[0004] Existing technology, such as patent publication number CN218215099U, utilizes electromagnetic pins to secure the knife switch, but this only maintains one state—for example, maintaining the switch in the off state to prevent the high current generated when the switch is closed. However, once the switch is in the closed state, this patent cannot prevent workers from attempting to open the switch. Therefore, a knife switch that prevents misoperation and can be secured in both the off and closed positions is needed to prevent injuries to workers. Utility Model Content

[0005] The embodiment of the utility model provides a knife switch that prevents misoperation, thereby at least partially solving the technical problem in the prior art of causing personal injury due to manual operation of the knife switch under load, and realizes automatic locking of the knife switch under load, thereby ensuring the safety of personnel.

[0006] In the first aspect, to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0007] A knife switch for preventing misoperation, comprising:

[0008] A base, wherein a static contact is provided on the base;

[0009] The contact knife is hinged to the base, and the contact knife rotates to the static contact point to energize the knife switch, and the contact knife leaves the static contact point to disconnect the knife switch;

[0010] The touch knife is provided with a locking piece, which is arranged along the movement direction of the touch knife; locking holes are respectively provided at both ends of the locking piece;

[0011] An automatic telescopic device, in response to the load of the above-mentioned knife switch circuit meeting a preset range, the above-mentioned automatic telescopic device extends the locking pin and inserts it into the above-mentioned locking hole to constrain the above-mentioned contact knife to maintain the off-switch or on-switch state; or retracts the above-mentioned locking pin to leave the above-mentioned locking hole to allow the above-mentioned contact knife to rotate freely.

[0012] In some embodiments, the automatic telescopic device includes:

[0013] Telescopic device,

[0014] A rectifier and filter device, the input end of which is connected to the incoming line of the knife switch;

[0015] a current comparator, wherein a first input terminal of the current comparator is connected to an output terminal of the rectifying and filtering device;

[0016] A current transformer, wherein the output end of the current transformer is connected to the second input end of the current comparator, and the plurality of current transformers are used to collect the current on each outgoing line of the knife switch and transmit the current to the current comparator;

[0017] A controller, wherein the input end of the controller is connected to the output end of the current comparator, and the controller drives the locking pin of the telescopic device to extend or retract in response to the current potential signal of the current comparator.

[0018] In some embodiments, the automatic telescopic device further comprises:

[0019] a resistance comparator, the resistance comparator being connected to the current comparator to obtain the power supplied by the rectifier and filter device; an input end of the resistance comparator being connected to each output line of the knife switch, and an output end of the resistance comparator being connected to the controller;

[0020] The controller drives the locking pin of the telescopic device to extend or retract in response to the resistance potential signal of the resistance comparator.

[0021] In some embodiments, a warning light is further included, which is connected to the output end of the controller and is used to light up when the telescopic device is inserted into the locking pin.

[0022] In some embodiments, the telescopic device uses an electromagnetic pin, and the electromagnetic pin is electrically connected to the controller.

[0023] In some embodiments, the telescopic device comprises:

[0024] A locking pin, wherein the locking pin is provided with a threaded hole, and a guide groove is provided on the side wall of the locking pin along the length direction of the locking pin;

[0025] A guide sleeve, wherein a guide boss is provided in the guide sleeve, the guide boss is slidably connected to the guide groove, and the guide sleeve is connected to the motor;

[0026] A motor, wherein the output shaft of the motor is provided with an external thread adapted to the threaded hole; the motor is electrically connected to the controller, and the controller drives the locking pin to extend or retract along the trajectory constrained by the guide sleeve by controlling the forward and reverse rotation of the motor.

[0027] In some embodiments, the locking member is fan-shaped.

[0028] In some embodiments, a handle is provided on the end of the touch knife away from the locking member.

[0029] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0030] This new design, based on a traditional knife switch, adds a locking member positioned along the knife's motion trajectory, with locking holes at both ends. Furthermore, an automatic retractable mechanism, when detecting that the line load carried by the knife switch is within a preset range, drives the locking pin precisely into the locking hole, effectively locking the knife in place and preventing unintended closing or opening operations under unsafe conditions. This completely eliminates the risk of arcing caused by improper operation, ensuring stable operation of the electrical system and operator safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic diagram of the structure of a knife switch in the closed state to prevent misoperation provided by the utility model;

[0033] Figure 2 This is a schematic structural diagram of the intermediate state of the knife switch of the utility model;

[0034] Figure 3 This is a structural diagram of the knife switch in the utility model in the off state;

[0035] Figure 4 This is a schematic diagram of the automatic retraction device in the present utility model;

[0036] Figure 5 This is a schematic structural diagram of the telescopic assembly in the present utility model;

[0037] Figure 6 It is a schematic diagram of the principle of the control steps in the utility model.

[0038] Figure numerals: 1. base; 11. static contact; 2. contact knife; 21. locking piece; 211. locking hole; 22. handle; 3. automatic telescopic device; 31. rectifier and filter device; 32. current comparator; 33. resistance comparator; 34. controller; 35. telescopic device; 351. motor; 3511. output shaft; 352. guide sleeve; 3521. guide boss; 353. locking pin; 3531. guide groove; 3532. threaded hole. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0042] In the description of this utility model, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances. In addition, the terms "first" and "second" are used only to distinguish descriptions and should not be understood to indicate or imply relative importance.

[0043] It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0044] The technical solution of the embodiment of the utility model is to solve the above technical problems, and the overall idea is as follows:

[0045] This new design offers a safety upgrade over the traditional knife switch by adding a locking member 21 positioned along the motion trajectory of the contact blade 2, with locking holes 211 at each end. Furthermore, an automatic retractable mechanism 35, when detecting that the line load carried by the knife switch is within a preset range, precisely drives a locking pin 353 into the locking hole 211, effectively locking the contact blade 2 in place and preventing unintended closing or opening operations. This completely eliminates the risk of arcing caused by improper operation, ensuring stable operation of the electrical system and operator safety.

[0046] In the embodiment of the present utility model, there is provided Figure 1 、 Figure 2 and Figure 3 A knife switch for preventing misoperation is shown, wherein Figure 1 This is a schematic diagram of the knife switch in the closed state. Figure 2 is a schematic diagram of the intermediate state. Figure 3 This is a schematic diagram of the disconnected state. The details are as follows:

[0047] The base 1 is provided with a static contact 11. As an important component of the knife switch HK, the static contact 11 cooperates with the contact knife 2 (also called the moving contact) to realize the connection and disconnection of the circuit. Figure 1 As shown, the circuit is connected; when the knife is separated from the static contact 11, as shown Figure 3 At the same time, the contact knife 2 is hinged to the base 1, so that the contact knife 2 can rotate to a position in contact with the static contact 11 or away from the static contact 11, thereby completing the power on or power off of the knife switch HK.

[0048] A locking member 21 is provided on the touch knife 2 , and the locking member 21 is arranged along the movement direction of the touch knife 2 ; locking holes 211 are respectively provided at both ends of the locking member 21 .

[0049] It should be noted that, unlike the conventional contact blade 2 design, the locking member 21 in this design features locking holes 211 at both ends. This innovation greatly simplifies the locking operation. Due to the compact size of the conventional contact blade 2 and the fact that the locking holes 211 are often located radially along the motion trajectory, automatic retractable devices 35 must be installed at the two key positions of closing and opening to achieve stable locking. This not only increases equipment cost but also makes maintenance more difficult.

[0050] This embodiment, however, provides locking holes 211 at both ends of the locking member 21. Regardless of whether the stylus 2 is in the closed or open state, at least one locking hole 211 automatically aligns with the center of the stylus 2's motion trajectory. This design, requiring only one automatic retractable device 35, effectively locks the stylus 2 in any position. This not only simplifies the structure and reduces costs, but also improves locking flexibility and reliability, ensuring that the stylus 2 remains stably and securely in the desired position during operation.

[0051] Specifically, the locking member 21 is fan-shaped, with its arc concentric with the motion trajectory of the stylus 2. The fan-shaped locking member 21 ensures that the locking hole 211 on the stylus 2 moves along a continuous and uniform trajectory, whether in the fully closed (on) or fully open (off) state. This feature greatly simplifies the locking process of the automatic telescopic device 35, as it means that no matter the position of the stylus 2, the automatic telescopic device 35 can interface with the locking hole 211 in the same manner and efficiency, achieving fast and stable locking. This not only improves operational convenience but also enhances the stability and reliability of the stylus 2 system under different operating conditions.

[0052] The automatic retractable device 35 responds to the load on the knife switch HK circuit meeting a preset range by extending the locking pin 353 into the locking hole 211 to lock the contact knife 2 in the off or on state; or retracting the locking pin 353 out of the locking hole 211 to allow the contact knife 2 to rotate freely. This automatic retractable device 35 combines intelligent and mechanized features to improve the convenience and safety of knife switch HK operation and the overall stability of the system. Its core function is to automatically control the extension and retraction of the locking pin 353 based on the load state of the knife switch HK circuit, thereby precisely locking and releasing the position of the contact knife 2.

[0053] In some embodiments, as Figure 4 As shown, the automatic telescopic device 35 includes: a telescopic device 35, a rectifier and filter device 31, a current comparator 32, a current transformer ( Figure 4 CT1, CT2 and CT3) and a controller 34; an input end of the rectifier and filter device 31 is connected to the incoming line of the knife switch; a first input end of the current comparator 32 is connected to the output end of the rectifier and filter device 31; the output end of the current transformer is connected to the second input end of the current comparator 32, and multiple current transformers are used to collect the current on each outgoing line of the knife switch HK and transmit the current comparator 32; the input end of the controller 34 is connected to the output end of the current comparator 32, and the controller 34 drives the locking pin 353 of the telescopic device 35 to extend or retract in response to the current potential signal of the current comparator 32.

[0054] Specifically, the automatic telescopic device 35 obtains electrical energy from the incoming line of the knife switch HK, and first converts the alternating current into stable direct current through the rectifier and filter device 31. This process effectively eliminates fluctuations and interference in the current, providing a reliable power basis for subsequent control logic.

[0055] Next, current transformers are distributed along each outgoing line of knife switch HK, capturing and transmitting current data from each line in real time to current comparator 32. As the core of data analysis, current comparator 32 compares the actual load current with a preset threshold. If a current anomaly, such as an overload or short circuit, is detected, a potential signal (e.g., high or low level) is immediately issued.

[0056] Upon receiving the potential signal, the controller 34 quickly responds by driving the locking pin 353 of the retractable device 35 to extend or retract. For example, upon receiving a high voltage signal, the locking pin 353 extends, while upon receiving a low voltage signal, the locking pin 353 retracts. When the locking pin 353 is properly inserted into the locking hole 211, the contact blade 2 is securely locked in the desired position, preventing the operator from operating the switch. This prevents arcing and potentially burns.

[0057] In addition, the automatic telescopic device 35 further includes: a resistance comparator 33, which is connected to the current comparator 32 to obtain the power supplied by the rectifier and filter device 31; an input end of the resistance comparator 33 is connected to each output line of the knife switch HK, and an output end of the resistance comparator 33 is connected to the controller 34;

[0058] The controller 34 drives the locking pin 353 of the telescopic device 35 to extend or retract in response to the resistance potential signal of the resistance comparator 33 .

[0059] Specifically, before the power system performs a closing operation, resistance comparator 33 plays a crucial role in pre-checking. Its input is closely connected to each outgoing line of knife switch HK. This design aims to accurately monitor the resistance value of each outgoing line in real time. This resistance information is crucial for assessing the current state of the circuit and predicting the safety of the closing operation.

[0060] Resistance comparator 33 not only monitors resistance but also incorporates a set of preset threshold values. If the resistance of a particular outgoing line is detected to be below this threshold, resistance comparator 33 immediately identifies this as an abnormality and determines that closing the circuit breaker at this point would result in excessive current. Excessive current could not only damage electrical equipment but also cause more serious safety incidents, such as short circuits and fires.

[0061] Therefore, upon identifying this potential risk, resistance comparator 33 quickly generates a resistance potential signal and transmits this signal to controller 34 via its output terminal. As the core control unit of the system, controller 34, upon receiving a potential signal from resistance comparator 33, such as a high level, immediately takes action, driving the locking pin 353 of the telescopic device 35 to extend, locking the current state to prevent human error. When the lock needs to be released (i.e., the risk has been eliminated), controller 34 outputs a low level, driving the locking pin 353 of the telescopic device 35 to retract.

[0062] In some embodiments, a warning light LT is further included. The warning light LT is connected to the output terminal of the controller 34 and is configured to illuminate when the locking pin 353 of the telescopic device 35 is inserted. The warning light LT, in conjunction with the controller 34, illuminates when the locking pin 353 of the telescopic device 35 is inserted, providing the operator with intuitive and rapid information on the operating status of the device, ensuring safe and accurate operation.

[0063] In some embodiments, the retractable device 35 is an electromagnetic pin, which is electrically connected to the controller 34. The electromagnetic pin operates by driving the locking pin 353 to reciprocate via an electromagnet, which can quickly respond via an electrical signal and quickly lock the stylus 2, further improving safety.

[0064] Similarly, the telescopic device 35 can also adopt another structure, such as Figure 5As shown, it includes a locking pin 353, a guide sleeve 352 and a motor 351. A threaded hole 3532 is provided on the locking pin 353, and a guide groove 3531 is provided on the side wall of the locking pin 353 along the length direction of the locking pin 353; a guide boss 3521 is provided in the guide sleeve 352, and the guide boss 3521 is slidably connected to the guide groove 3531 to constrain the movement trajectory of the locking pin 353, and the guide sleeve 352 is connected to the motor 351; an external thread that is adapted to the threaded hole 3532 is provided on the output shaft 3511 of the motor 351; the motor 351 is electrically connected to the controller 34, and the controller 34 drives the locking pin 353 to extend or retract along the trajectory constrained by the guide sleeve 352 by controlling the forward and reverse rotation of the motor 351.

[0065] In the embodiment of the present invention, the convenience of operation, safety and system stability of the knife switch HK are significantly improved by adding a locking member 21 and an automatic telescopic device 35. The design of the locking holes 211 at both ends of the locking member 21 simplifies the complexity of the locking operation, reduces equipment costs and maintenance difficulties, and enhances the flexibility and reliability of the locking. The automatic telescopic device 35 integrates intelligence and mechanization, automatically locking and releasing the contact knife 2 according to the load and resistance status of the knife switch HK circuit, effectively preventing misoperation and potential safety risks. In addition, the design of the warning light LT and the locking pin 353 driven by the electromagnetic pin or motor 351 further enhances the intuitiveness and safety of the operation, ensuring that the knife switch HK can operate stably and reliably under different working conditions.

[0066] In some embodiments, a handle is provided on the end of the touch knife away from the locking member to facilitate the operator to operate under no-load conditions.

[0067] In actual control, the embodiment of the present invention is controlled according to the following steps, which are as follows:

[0068] S101: In the closed state, the current data collected by the current transformer is compared with a preset first current threshold by the current comparator 32. If the current data is greater than or equal to the preset first current threshold, the current comparator 32 outputs a high voltage to the controller 34. If the current data is less than the preset first current threshold, no operation is performed. This step is intended to detect the current in the circuit where the knife switch HK is located and, by comparing it with the preset first current threshold, determine whether the circuit is currently under high load, thereby preventing personnel from disconnecting the circuit while the circuit is under load.

[0069] S102 , in response to the high potential, the controller 34 drives the locking pin 353 of the telescopic device 35 to extend, so as to lock the knife switch HK in the closed state.

[0070] In step S201, in the off state, resistance comparator 33 detects the resistance of the outgoing line of knife switch HK and compares it with a preset first resistance threshold. If the resistance is less than or equal to the preset first resistance threshold, resistance comparator 33 outputs a high voltage to controller 34. If the resistance is greater than the preset first resistance threshold, no action is taken. This step is intended to detect the resistance of the line where knife switch HK is located and, by comparing it with the preset first resistance threshold, determine whether closing the circuit will result in excessive current, thereby preventing fire.

[0071] S202 , in response to the high potential, the controller 34 drives the locking pin 353 of the telescopic device 35 to extend, so as to lock the knife switch HK in the off state.

[0072] When the voltage of the knife switch HK is 0, the current comparator 32 detects that the current is less than the second current threshold, or the resistance comparator 33 detects that the resistance is greater than the second resistance threshold, the locking pin 353 of the telescopic device 35 is kept in a retracted state so that the knife switch HK can be freely opened and closed.

[0073] Among them, when the voltage of the knife switch HK is 0, it indicates that this part of the circuit is in a non-working state or has been safely isolated, and there is no danger in manually operating the knife switch HK. The current comparator 32 detects that the current flowing through the knife switch HK is less than the preset second current threshold (that is, the maximum current value allowed for the knife switch HK to be closed), which means that the current load is low and suitable for opening and closing operations. The resistance comparator 33 detects that the resistance value of the relevant circuit is greater than the second resistance threshold, indicating that the circuit is in an open circuit state or the load is extremely light, and is also suitable for closing or opening operations. When any of the above conditions is met, the system will automatically keep the locking pin 353 of the telescopic device 35 in a retracted state. This design allows the knife switch HK to be freely opened and closed without physical obstruction, thereby ensuring that the operator can perform switching operations of the power equipment under safe and appropriate conditions, improving operational efficiency and reducing the risk of accidents.

[0074] In some embodiments of the present invention, intelligent monitoring and adaptive locking mechanisms effectively improve the safety and efficiency of knife switch HK operation. By detecting current and resistance data in real time and comparing them with preset thresholds, the knife switch HK can be automatically locked under high load or potential risk conditions, preventing the danger of load tripping. Furthermore, automatic unlocking is performed when the circuit is safe, the load is low, or the circuit is open, ensuring that the knife switch HK can be opened and closed freely under appropriate conditions. This not only protects power facilities but also improves operational convenience and reduces the risk of accidents caused by human error.

[0075] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0076] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A knife switch for preventing misoperation, characterized in that: The knife switch comprises: A base (1), wherein a static contact (11) is provided on the base (1); A contact knife (2), wherein the contact knife (2) is hinged to the base (1), and the contact knife (2) rotates to the static contact point (11) to energize the knife switch, and the contact knife (2) leaves the static contact point (11) to disconnect the knife switch; The touch knife (2) is provided with a locking member (21), and the locking member (21) is arranged along the movement direction of the touch knife (2); locking holes (211) are respectively provided at both ends of the locking member (21); An automatic telescopic device (3) extends a locking pin (353) and inserts it into the locking hole (211) in response to the load of the knife switch circuit meeting a preset range, so as to constrain the contact knife (2) to maintain an off-switch or on-switch state; or retracts the locking pin (353) and moves it away from the locking hole (211), so as to allow the contact knife (2) to rotate freely.

2. The knife switch according to claim 1, wherein: The automatic telescopic device (3) comprises: telescopic device (35), A rectifier and filter device (31), wherein an input end of the rectifier and filter device (31) is connected to an incoming line of the knife switch; a current comparator (32), wherein a first input end of the current comparator (32) is connected to an output end of the rectifying and filtering device (31); A current transformer, wherein the output end of the current transformer is connected to the second input end of the current comparator (32), and a plurality of the current transformers are used to collect the current on each output line of the knife switch and transmit the current to the current comparator (32); A controller (34) having an input end connected to an output end of the current comparator (32) and driving a locking pin (353) of the telescopic device (35) to extend or retract in response to a current potential signal from the current comparator (32).

3. The knife switch according to claim 2, wherein: The automatic telescopic device (3) further comprises: a resistance comparator (33), the resistance comparator (33) being connected to the current comparator (32) to obtain the power supplied by the rectifier and filter device (31); an input end of the resistance comparator (33) being connected to each output line of the knife switch, and an output end of the resistance comparator (33) being connected to the controller (34); The controller (34) drives the locking pin (353) of the telescopic device (35) to extend or retract in response to the resistance potential signal of the resistance comparator (33).

4. The knife switch according to any one of claims 2 to 3, characterized in that: The knife switch also includes a prompt light, which is connected to the output end of the controller (34) and is used to light up and prompt when the telescopic device (35) is inserted into the locking pin (353).

5. The knife switch according to any one of claims 2 to 3, characterized in that: The telescopic device (35) adopts an electromagnetic pin, and the electromagnetic pin is electrically connected to the controller (34).

6. The knife switch according to any one of claims 2 to 3, characterized in that: The telescopic device (35) comprises: A locking pin (353), wherein a threaded hole (3532) is provided on the locking pin (353), and a guide groove (3531) is provided on the side wall of the locking pin (353) along the length direction of the locking pin (353); A guide sleeve (352), wherein a guide boss (3521) is provided in the guide sleeve (352), the guide boss (3521) is slidably connected to the guide groove (3531), and the guide sleeve (352) is connected to the motor (351); A motor (351) is provided on an output shaft (3511) of the motor (351), wherein an external thread adapted to the threaded hole (3532) is provided; the motor (351) is electrically connected to the controller (34); the controller (34) drives the locking pin (353) to extend or retract along a trajectory constrained by the guide sleeve (352) by controlling the forward and reverse rotation of the motor (351).

7. The knife switch according to claim 1, wherein: The locking member (21) is fan-shaped.

8. The knife switch according to claim 1, wherein a handle (22) is provided on the end of the knife contact (2) away from the locking member (21).

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