Grounding knife-switch static contact bayonet improvement device

Abstract

The invention relates to the technical field of grounding knife-switches, in particular to a grounding knife-switch static contact bayonet improvement device which comprises a ground switch assembly, a base plate, an arc-shaped copper plate arranged at the top end of the base plate and used for being matched with a moving contact of a grounding knife-switch, and a pressing piece installed on the side wall of the arc-shaped copper plate. The arc-shaped copper plates are positioned on the two sides of the connecting plate and are arranged in a shape like a Chinese character'ji '; the buffer assembly comprises an outer protruding block arranged on the side wall of the arc-shaped copper plate, the outer protruding block is used for containing a telescopic space of a smooth roller, and the side wall of the smooth roller penetrates through the arc-shaped copper plate and extends to the outside to be used for reducing friction force. According to the utility model, the stability and flexibility of the static contact in the clamping groove are ensured, the mechanical impact in the operation process is reduced, the operation risk is reduced, and the safety of operators is improved.

Description

Technical Field

[0001] The invention relates to the technical field of grounding knife switches, and in particular to an improved device for a static contact socket of a grounding knife switch. Background Art

[0002] In the power system, the grounding knife switch of the substation is mainly used to ensure reliable grounding of the circuit during equipment maintenance or fault handling to ensure the safety of the operator. At present, most grounding knife switches of 110kV and below voltage levels are manually operated, and their structure basically adopts the method of clamping the moving and static contacts. This kind of bayonet generally adopts a structure with soft copper sheets on both sides that are wide on the outside and small on the inside. When operating, the grounding rod is clamped in, and the principle of the wedge structure is used to clamp the grounding rod.

[0003] However, this structure has several major problems:

[0004] The operating force is difficult to control: if the force is too light during operation, the grounding rod will not be able to make contact; if the force is too strong, the grounding rod will be stuck too deeply. It will not be able to be pulled apart during the operation; forcibly pulling it apart may cause damage to the equipment.

[0005] Excessive tightening of the bayonet: Especially when the porcelain bottle of the isolating switch support is defective or severely corroded, increasing the force to open the grounding switch may break or twist the porcelain bottle of the isolating switch support, causing damage to the operating equipment and affecting the power supply reliability.

[0006] Deformation of transmission fixing parts: The various transmission fixing parts of the grounding switch are connected by clamp fixing. When the bayonet is clamped too tightly and pulled hard, the clamp fixing part will be displaced and deformed, making the pulling operation not in place. At the same time, it will also cause the three phases to be out of phase when the grounding switch is closed next time, and they cannot be closed at the same time, resulting in poor operation quality.

[0007] Equipment aging problem: Currently, most substation equipment has been in operation for more than 10 years. Due to various reasons such as corrosion and oxidation, the frequency of this jamming phenomenon is as high as more than 80%. The problem exists on a wide scale and needs to be solved urgently.

[0008] Operation time and labor intensity: When the operator closes or opens the grounding switch, due to the large friction, it is necessary to add an auxiliary force rod, which increases the operator's workload and operation time. The normal operation time for opening a set of grounding switches is about 5 minutes. The operation time when the grounding switch is stuck increases to more than 15 minutes, and the operation time increases by nearly 3 times, which seriously affects the operation time and has an adverse effect on the power supply of important loads and emergency repairs.

[0009] Maintenance cost and maintenance time: When the friction is too large, the grounding switch is easily deformed and damaged when operating with too much force, which increases maintenance cost and maintenance time. If the other side of the switch is energized, a power outage must be requested, which increases the power outage time and reduces the reliability of power supply. Summary of the invention

[0010] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0011] In view of the fact that the above-mentioned snap-in grounding switch has the problems of high operation risk, time-consuming and labor-intensive operation in actual operation, which seriously affects the operation efficiency and power supply reliability of the power system, the present invention is proposed.

[0012] Therefore, the object of the present invention is to provide a grounding switch static contact bayonet improvement device.

[0013] In order to solve the above technical problems, the present invention provides the following technical solutions: an improved device for the static contact of a grounding knife switch, comprising: a grounding switch assembly, comprising a base plate, an arc-shaped copper plate arranged on the top of the base plate for cooperating with the moving contact of the grounding knife switch, a pressing sheet is installed on the side wall of the arc-shaped copper plate, and the arc-shaped copper plate is located on both sides of the connecting plate in a "J" shape; and

[0014] The buffer assembly comprises an outer protrusion arranged on the side wall of the arc-shaped copper plate, wherein the outer protrusion is used to accommodate the telescopic space of the smooth roller, wherein the side wall of the smooth roller extends through the arc-shaped copper plate to the outside to reduce friction, and the smooth roller is located at the "J"-shaped bending point of the arc-shaped copper plate, and is used to lock or release the connection between the moving contact and the arc-shaped copper plate bayonet structure, and the side wall of the smooth roller is provided with an elastic member.

[0015] As a preferred solution of the improvement device of the static contact snap-in of the grounding knife switch described in the present invention, the ground switch assembly also includes an elastic raised buffer sheet arranged on the side wall of the connecting plate, and the elastic raised buffer sheet is made of silicone rubber material, which is used to ensure good contact between the grounding rod and the clamped arc-shaped copper plate, thereby reducing damage caused by mechanical vibration when operating the isolating switch.

[0016] As a preferred solution of the grounding switch static contact bayonet improvement device of the present invention, the main body of the base plate is made of aluminum alloy material, the pressing plate is made of stainless steel material, and the main body of the connecting plate is made of aluminum alloy material.

[0017] As a preferred solution of the grounding switch static contact bayonet improvement device of the present invention, the arc-shaped copper plate is made of surface electroplated brass material, and the smooth roller is made of aluminum alloy material.

[0018] As a preferred solution of the device for improving the static contact snap-in of the grounding knife switch described in the present invention, the buffer assembly also includes a guide groove arranged inside the arc-shaped copper plate for guiding the moving contact of the grounding knife switch to be correctly inserted into the arc-shaped copper plate snap-in structure, and the front end of the arc-shaped copper plate gradually shrinks to facilitate the smooth insertion of the moving contact.

[0019] As a preferred solution of the grounding switch static contact bayonet improvement device described in the present invention, the elastic member includes a fixing groove arranged inside the outer protrusion, the smooth roller is located inside the fixing groove, and the smooth roller is sleeved on the side wall of the pin.

[0020] As a preferred solution of the grounding knife switch static contact bayonet improvement device described in the present invention, the elastic member also includes a fixing rod arranged between the pins, and the spacing between the fixing rod and the pin forms a limiting groove for preventing the smooth roller from moving up and down.

[0021] As a preferred solution of the grounding knife switch static contact bayonet improvement device described in the present invention, the elastic member also includes a slot arranged at the top of the fixed slot, the two ends of the pin are located inside the slot, and the slot has a guiding function for limiting the moving direction of the pin.

[0022] As a preferred solution of the grounding switch static contact bayonet improvement device described in the present invention, the elastic member also includes a telescopic spring arranged inside the slot, one end of the telescopic spring is connected to the pin, and the end of the telescopic spring away from the pin is connected to the inner wall of the slot.

[0023] As a preferred solution of the grounding switch static contact bayonet improvement device described in the present invention, the telescopic spring is used to push the smooth roller to move toward the direction of the arc-shaped copper plate bayonet structure, and the telescopic spring is used to control the sliding of the pin to achieve the locking or releasing function.

[0024] Beneficial effects of the present invention: The present invention ensures the stability and flexibility of the static contact in the slot by introducing the connection design of the elastic member and the smooth roller with the static contact, reduces the mechanical impact during operation, reduces the operation risk, and improves the safety of the operator. The optimized bayonet structure makes the connection between the static contact and the moving contact more convenient, reduces the operation steps, shortens the operation time, and improves the work efficiency, especially in emergency situations, it can respond quickly to ensure the safe operation of the power system. The groove design on the top of the static contact matches the raised part of the moving contact, increases the contact area, improves the conduction performance, reduces the contact resistance, and ensures the stability and reliability of power transmission. The surface of the static contact is specially treated to improve the wear resistance and conductivity. At the same time, the design of the guide groove and the guide block reduces the wear of the static contact during movement, effectively extending the service life of the equipment. The fixed seat is made of high temperature resistant material, which can adapt to the high temperature environment that may occur in the power system and ensure the normal operation of the equipment under extreme conditions. The design of the dust cover also effectively prevents dust from entering the slot, reducing failures caused by dust.

[0025] To sum up, through a series of innovative designs, the present invention not only solves the problems of high operational risk, time-consuming and labor-intensive operation of the existing snap-in grounding switch in actual operation, but also significantly improves the operating efficiency and power supply reliability of the power system, and has important application value and broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without any creative labor.

[0027] Figure 1 The figure is an overall schematic diagram of an improved device for the static contact of a grounding switch.

[0028] Figure 2 The present invention is a top view of the overall structure of an improved device for the static contact of a grounding knife switch.

[0029] Figure 3 The present invention is a schematic diagram of the disassembled structure of an improved device for the static contact of a grounding knife switch.

[0030] Figure 4 for Figure 2 Enlarged view of point A in .

[0031] Figure 5 The present invention is a schematic diagram of the connection structure between the pin and the fixing rod of an improved device for the static contact of a grounding knife switch.

[0032] Reference numerals:

[0033] 100, ground gate assembly; 101, base plate; 102, arc-shaped copper plate; 103, connecting plate; 104, elastic raised buffer sheet; 105, pressing sheet;

[0034] 200, buffer assembly; 201, external protrusion; 202, smooth roller; 203, elastic member; 204, guide groove

[0035] 203a, fixing groove; 203b, latch; 203c, fixing rod; 203d, limiting groove; 203e, slot; 203f, telescopic spring. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0040] Example 1, reference Figure 1-2 , which is the first embodiment of the present invention, provides a grounding switch static contact bayonet improvement device, including, mainly by optimizing the structural design of the grounding switch assembly 100, ensuring the stable and reliable connection between the moving contact and the static contact of the grounding switch, while reducing mechanical vibration and friction during operation, and improving the service life and safety of the equipment.

[0041] Specifically, the ground switch assembly 100 includes a base plate 101 and an arc-shaped copper plate 102 arranged on the top of the base plate 101 for cooperating with the moving contact of the grounding switch. The side wall of the arc-shaped copper plate 102 is installed with a pressing plate 105 for further fixing and pressing the moving contact to ensure the stability of the connection. The arc-shaped copper plate 102 is located on both sides of the connecting plate 103 in a "J" shape.

[0042] Furthermore, the ground gate assembly 100 also includes an elastic raised buffer sheet 104 arranged on the side wall of the connecting plate 103. The elastic raised buffer sheet 104 is made of silicone rubber material. Silicone rubber has excellent elasticity and wear resistance, and can effectively reduce the damage caused by mechanical vibration to the arc copper plate 102 and the grounding rod when operating the disconnector. It is used to ensure good contact between the grounding rod and the clamped arc copper plate 102, thereby reducing the damage caused by mechanical vibration when operating the disconnector.

[0043] Furthermore, the main body of the base plate 101 is made of aluminum alloy material, which has the characteristics of light weight and high strength. The pressing plate 105 is made of stainless steel material, which has excellent strength and corrosion resistance. The main body of the connecting plate 103 is made of aluminum alloy material to reduce the weight of the entire device.

[0044] Furthermore, the arc-shaped copper plate 102 is made of a surface-electroplated brass material, and the smooth roller 202 is made of an aluminum alloy material, which has good conductivity and corrosion resistance.

[0045] Operation process: Ensure that the grounding knife switch is in the disconnected state, and check whether the various components of the grounding switch assembly 100 are intact. Clean the contact surface between the arc-shaped copper plate 102 and the moving contact to ensure that there are no impurities or oxides that affect the conduction performance.

[0046] Closing operation: The operator aligns the moving contact of the grounding knife switch with the bayonet structure of the arc copper plate 102. Gently push the moving contact towards the arc copper plate 102, and the pressing sheet 105 will play a role of fixing and pressing. After the moving contact contacts the arc copper plate 102, the elastic raised buffer sheet 104 will absorb part of the impact force to ensure a stable connection between the two. If the design includes a smooth roller 202, the roller will guide the moving contact to correctly insert into the bayonet structure and reduce friction.

[0047] Disconnection operation: When the operator needs to disconnect the grounding knife switch, first apply a certain external force to separate the moving contact from the arc copper plate 102. During the separation process, the pressing sheet 105 will maintain a certain pressure to ensure that the moving contact will not pop out suddenly or cause damage. The elastic protrusion buffer sheet 104 and the smooth roller 202 will further reduce the vibration and friction during the separation process.

[0048] Example 2, reference Figure 2 to Figure 4, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that the buffer assembly 200 is uniquely designed to improve the operating efficiency and safety of the grounding switch by reducing friction and providing precise guidance.

[0049] Specifically, the buffer assembly 200 includes an outer protrusion 201 arranged on the side wall of the arc-shaped copper plate 102, and the outer protrusion 201 is used to accommodate the expansion and contraction space of the smooth roller 202, wherein the side wall of the smooth roller 202 passes through the arc-shaped copper plate 102 and extends to the outside to reduce friction. The smooth roller 202 is located at the "J"-shaped bending point of the arc-shaped copper plate 102, and is used to lock or release the connection between the moving contact and the bayonet structure of the arc-shaped copper plate 102, and the side wall of the smooth roller 202 is provided with an elastic member 203. The smooth roller 202 is cleverly arranged in the outer protrusion 201 of the side wall of the arc-shaped copper plate 102. This design not only provides sufficient expansion and contraction space for the roller, but also ensures that the roller can rotate smoothly. The side wall of the smooth roller 202 passes through the arc-shaped copper plate 102 and extends to the outside. In this way, when the moving contact contacts the arc-shaped copper plate 102, the smooth roller 202 can reduce the friction between the two, making the operation easier and faster.

[0050] Furthermore, the buffer assembly 200 also includes a guide groove 204 arranged inside the arc-shaped copper plate 102 for guiding the moving contact of the grounding switch to be correctly inserted into the bayonet structure of the arc-shaped copper plate 102. The front end of the arc-shaped copper plate 102 gradually shrinks to facilitate the smooth insertion of the moving contact.

[0051] The rest of the structure is the same as that of Example 1.

[0052] Operation process: The operator first ensures that the moving contact of the grounding knife switch is aligned with the arc copper plate 102. Then, the moving contact is gently pushed towards the arc copper plate 102, at which time the smooth roller 202 starts to roll and reduces friction. The moving contact is gradually inserted into the bayonet structure of the arc copper plate 102 along the guide groove 204. When the moving contact is fully inserted and locked in place, the elastic member 203 releases energy and pushes the roller to reset to ensure a stable connection.

[0053] Opening operation:

[0054] When the operator needs to disconnect the grounding knife switch, he first applies a certain external force to separate the moving contact from the bayonet structure of the arc copper plate 102. During the separation process, the smooth roller 202 will again play a role in reducing friction, making the opening operation easier and faster. Once the moving contact is completely separated from the arc copper plate 102, the entire operation process is completed.

[0055] Example 3, reference Figure 2 to Figure 5, which is the third embodiment of the present invention. This embodiment is different from the above embodiments in that it not only improves the efficiency and safety of the grounding switch operation, but also extends the service life of the equipment and reduces the maintenance cost.

[0056] Specifically, the elastic member 203 includes a fixing groove 203a arranged inside the outer protrusion 201, the smooth roller 202 is located inside the fixing groove 203a, and the smooth roller 202 is sleeved on the side wall of the pin 203b. The design of the smooth roller 202 significantly reduces the friction of the grounding rod during insertion and removal, making the operation more labor-saving and quick.

[0057] Furthermore, the elastic member 203 further includes a fixing rod 203c disposed between the latch pins 203b, and the spacing between the fixing rod 203c and the latch pins 203b forms a limiting groove 203d for preventing the smooth roller 202 from moving up and down.

[0058] Furthermore, the elastic member 203 also includes a slot 203e arranged at the top of the fixing slot 203a, both ends of the pin 203b are located inside the slot 203e, and the slot 203e has a guiding function for limiting the moving direction of the pin 203b. The entire elastic member 203 is compactly designed and easy to install. It is suitable for various grounding switch devices, which improves practicality and versatility.

[0059] Furthermore, the elastic member 203 also includes a telescopic spring 203f arranged inside the slot 203e, one end of the telescopic spring 203f is connected to the pin 203b, and the end of the telescopic spring 203f away from the pin 203b is connected to the inner wall of the slot 203e. The resilience of the telescopic spring 203f ensures that the smooth roller 202 can fit tightly after the grounding rod is fully inserted, preventing it from accidentally falling out, thereby improving safety. The guiding function of the slot 203e ensures the moving direction of the pin 203b, making the operation of the entire mechanism more stable and reliable.

[0060] Furthermore, the telescopic spring 203f is used to push the smooth roller 202 to move toward the bayonet structure of the arc-shaped copper plate 102, and the telescopic spring 203f is used to control the sliding of the latch 203b to achieve the locking or releasing function.

[0061] The rest of the structure is the same as that of Example 2.

[0062] Operation process: The device uses a 1.5CM thick aluminum alloy plate as the connecting plate 103, which is more stress-resistant and light in weight. The thickness of the arc-shaped copper plates 102 on both sides is 0.5cm in the front and 0.25cm in the back. It not only has good elasticity and strong current-carrying capacity, but is also not easy to deform. An elastic raised buffer sheet 104 is added to reduce the damage caused by mechanical vibration when operating the disconnector. An elastic raised buffer sheet 104 with good elasticity is selected and fixed on the back of the connecting plate 103 to ensure good contact between the grounding rod and the clamped arc-shaped copper plate 102. Smooth rollers 202 are added to the copper plates clamped on both sides to reduce friction, so that the required operating state can be completed in a short time when opening and closing the grounding switch. It can help operators to complete the operation conveniently, save time and effort when operating the grounding knife switch, improve operating efficiency, reduce other risks caused by the auxiliary operating rod during operation, complete the power transmission work in time, and improve the reliability of power supply of the power grid. At the same time, the smooth roller 202 is added to reduce the friction force clamped by the arc-shaped copper plates 102 on both sides. When the grounding knife switch is closed, the grounding rod is pushed inward through the guidance of the guide groove 204, and the smooth roller 202 rotates under the action of the thrust. The grounding rod has a certain thickness, and the tension generated by the thrust makes the smooth roller 202 shrink inward to compress the telescopic spring 203f. After the grounding rod is inserted, the smooth roller 202 is reset by the rebound force of the telescopic spring 203f to prevent the grounding rod from running out. The grounding rod can slide inwards through the small friction of the smooth roller 202, so that the grounding rod can easily slide into the guide groove 204, which can effectively ensure that the grounding knife switch is in good contact with the elastic protruding buffer sheet 104 and the arc-shaped copper plates 102 clamped on both sides; when the grounding knife switch is separated, during the separation process, the grounding rod is slid outward by the small friction of the smooth roller 202, and is easily separated from the static contact of the grounding knife switch, which saves time, labor, safety and efficiency. The device is simple to install, has high practicality, can reduce operation time, reduce operation risks, improve work efficiency and reduce labor intensity.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An improved device for the static contact of a grounding switch, characterized in that: include, A ground switch assembly (100) comprises a base plate (101), an arc-shaped copper plate (102) arranged at the top of the base plate (101) for cooperating with a moving contact of a ground switch, a pressing sheet (105) being installed on the side wall of the arc-shaped copper plate (102), and the arc-shaped copper plate (102) being arranged in a "J" shape on both sides of a connecting plate (103); and, A buffer assembly (200) comprises an outer protrusion (201) arranged on the side wall of the arc-shaped copper plate (102), the outer protrusion (201) being used to accommodate the telescopic space of the smooth roller (202), wherein the side wall of the smooth roller (202) passes through the arc-shaped copper plate (102) and extends to the outside to reduce friction, the smooth roller (202) is located at the "J"-shaped bending point of the arc-shaped copper plate (102) and is used to lock or release the connection between the moving contact and the bayonet structure of the arc-shaped copper plate (102), and the side wall of the smooth roller (202) is provided with an elastic member (203).

2. The improved device for the static contact of the grounding switch according to claim 1, characterized in that: The ground switch assembly (100) further comprises an elastic protruding buffer sheet (104) arranged on the side wall of the connecting plate (103); the elastic protruding buffer sheet (104) is made of silicone rubber material and is used to ensure good contact between the grounding rod and the clamped arc-shaped copper plate (102), thereby reducing damage caused by mechanical vibration when operating the disconnector.

3. The improved device for the static contact of the grounding switch according to claim 2, characterized in that: The main body of the base plate (101) is made of an aluminum alloy material, the pressing plate (105) is made of a stainless steel material, and the main body of the connecting plate (103) is made of an aluminum alloy material.

4. The improved device for the static contact of the grounding switch according to claim 3 is characterized in that: The arc-shaped copper plate (102) is made of a surface-electroplated brass material, and the smooth roller (202) is made of an aluminum alloy material.

5. The improved device for the static contact of the grounding switch according to claim 4, characterized in that: The buffer assembly (200) further comprises a guide groove (204) arranged inside the arc-shaped copper plate (102) for guiding the moving contact of the grounding switch to be correctly inserted into the bayonet structure of the arc-shaped copper plate (102); the front end of the arc-shaped copper plate (102) is gradually reduced to facilitate the smooth insertion of the moving contact.

6. The improved device for the static contact of the grounding switch according to claim 5, characterized in that: The elastic member (203) comprises a fixing groove (203a) arranged inside the outer protrusion (201), the smooth roller (202) is located inside the fixing groove (203a), and the smooth roller (202) is sleeved on the side wall of the latch (203b).

7. The improved device for the static contact of the grounding switch according to claim 6, characterized in that: The elastic member (203) further comprises a fixing rod (203c) arranged between the latch pins (203b), and the spacing between the fixing rod (203c) and the latch pins (203b) forms a limiting groove (203d) for preventing the smooth roller (202) from moving up and down.

8. The improved device for the static contact of the grounding switch according to claim 7, characterized in that: The elastic member (203) further comprises a slot (203e) arranged at the top of the fixing groove (203a), both ends of the latch pin (203b) are located inside the slot (203e), and the slot (203e) has a guiding function for limiting the moving direction of the latch pin (203b).

9. The improved device for the static contact of the grounding switch according to claim 8, characterized in that: The elastic member (203) further comprises a telescopic spring (203f) arranged inside the slot (203e), one end of the telescopic spring (203f) being connected to the latch (203b), and one end of the telescopic spring (203f) away from the latch (203b) being connected to the inner wall of the slot (203e).

10. The improved device for the static contact of the grounding switch according to claim 9, characterized in that: The telescopic spring (203f) is used to push the smooth roller (202) to move in the direction of the bayonet structure of the arc-shaped copper plate (102), and the telescopic spring (203f) is used to control the sliding of the latch (203b) to achieve a locking or releasing function.

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