Locking structure

Abstract

The present invention relates to a locking structure, which solves the problem that the fire check valve will automatically fail in a low-temperature environment. The locking structure includes a base, a connecting rod, an elastic element and a dial. One end of the elastic element is arranged on the base, and the other end of the elastic element is arranged on the dial and used to drive the dial to rotate relative to the base. The locking structure further includes a fusing assembly, a fastening mechanism and a stop plate. The fastening mechanism is arranged on the base, the stop plate is arranged on the fastening mechanism, and the stop plate has a locking position and an unlocking position. When the fusing assembly works, the fusing assembly fixes the stop plate at the locking position so that the stop plate prevents the dial from rotating relative to the base. After the fusing assembly does not work and is separated from the stop plate, the elastic element pushes the stop plate to the unlocking position through the dial.

Description

Technical Field

[0001] The present invention relates to a locking structure. Background Art

[0002] The locking structure (for the specific structure, reference can be made to the utility model patent with the publication number CN206830892) includes a valve seat, a flap, a temperature sensing element, and an elastic element. The flap is rotatably connected to the valve seat. One end of the elastic element is arranged on the valve seat, and the other end of the elastic element is connected to the flap and drives the flap to abut against the temperature sensing element.

[0003] Since the temperature sensing element includes a first copper sheet and a second copper sheet, the first copper sheet and the second copper sheet are integrally connected by a fusible solder. The first copper sheet is fixedly connected to the valve seat, and the second copper sheet abuts against the flap. Therefore, when the other end of the elastic element is connected to the flap and drives the flap to abut against the temperature sensing element, the second copper sheet is always subjected to an upward torsional force. This results in that after the second copper sheet works for a period of time and the connection force of the fusible solder for connecting the first copper sheet and the second copper sheet < the torsional force of the second copper sheet, the second copper sheet will be separated from the first copper sheet.

[0004] The locking structure is used for a fire check valve. The fire check valve includes a valve body, a valve flap, and a connecting rod. The valve seat is arranged on the valve body, and the connecting rod is used for connecting the valve flap and the valve seat. After the second copper sheet is separated from the first copper sheet, the elastic element pushes the flap to rotate relative to the valve seat and abut against the connecting rod, and the connecting rod drives the valve flap to close the exhaust port on the valve body under the push of the flap. This causes the fire check valve to automatically fail in a low-temperature environment. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a locking structure to prevent the fire check valve from automatically failing in a low-temperature environment.

[0006] To solve the above problems, the present invention provides the following technical solutions:

[0007] The locking structure includes a base, a connecting rod, an elastic element, and a flap. The connecting rod and the flap are rotatably arranged on the base. One end of the elastic element is arranged on the base, and the other end of the elastic element is arranged on the flap and is used for driving the flap to rotate relative to the base. The locking structure further includes a fusing assembly, a fastening mechanism, and a stop plate. The fastening mechanism is arranged on the base, the stop plate is arranged on the fastening mechanism, and the stop plate has a locking position and an unlocking position. When the fusing assembly works, the fusing assembly fixes the stop plate in the locking position to prevent the flap from rotating relative to the base. After the fusing assembly does not work and is separated from the stop plate, the elastic element pushes the stop plate to the unlocking position through the flap.

[0008] In the present invention, the locking structure includes a fusing component, a fastening mechanism, and a stop plate. The fastening mechanism is disposed on the base, and the stop plate is disposed on the fastening mechanism. The stop plate has a locking position. When the fusing component operates, the fusing component fixes the stop plate at the locking position to prevent the paddle from rotating relative to the base. Compared with the prior art, the problem that the second copper sheet separates from the first copper sheet due to the torsional force that the fusible solder cannot withstand will not occur in the stop plate. This means that the stop plate can effectively ensure that the fire check valve "continuously" and reliably operates in a low-temperature environment (the low-temperature environment refers to the ambient temperature of the fire check valve being lower than the melting point of the fusing mechanism). With such a design, the fire check valve will not automatically fail in a low-temperature environment.

[0009] In the present invention, after the fusing component does not operate and the fusing component separates from the stop plate, the elastic element pushes the stop plate to the unlocking position through the paddle. At this time, the paddle can continue to rotate around the base under the drive of the elastic element. With such a design, the fire check valve will close the exhaust port through the valve plate in a high-temperature environment (the high-temperature environment refers to the ambient temperature of the fire check valve being higher than the melting point of the fusing mechanism), so that the fire check valve can play a role in preventing fire and smoke.

[0010] Furthermore, the fastening mechanism inclines downward from the side away from the base to the side close to the base. After the lower end of the stop plate moves, the relative displacement of the upper end of the stop plate will increase. The stop plate shortens the time required for the stop plate to separate from the paddle by increasing the relative displacement of the upper end. With such a design, the time required for the fire check valve to play a role in preventing fire and smoke is shortened.

[0011] Furthermore, a limiting channel is provided on the stop plate. After the fusing component does not operate, the stop plate slides axially and / or rotates along the limiting channel. With such a design, when the fusing component cannot slide, it rotates to ensure that the stop plate and the paddle are separated in time in a high-temperature environment.

[0012] Furthermore, a first anti-rotation portion is provided at the upper end of the stop plate. The first anti-rotation portion is provided on the stop plate to prevent the stop plate from rotating relative to the base. A second anti-rotation portion is provided at the lower end of the stop plate. The second anti-rotation portion is provided on the base to prevent the stop plate from rotating relative to the fastening mechanism. The second anti-rotation portion is used to increase the difficulty of the stop plate separating from the paddle when the fusing component operates.

[0013] Furthermore, the base includes a valve seat and a fixing plate. A card slot is provided on the fixing plate, and the second anti-rotation portion is clamped in the card slot. This structure is used to shorten the time required for the stop plate to separate from the paddle after the fusing component separates from the stop plate.

[0014] Further, the fixing plate includes a first connecting portion, a second connecting portion, and a clamping portion for connecting the first connecting portion and the second connecting portion. The clamping portion is inclined, and the clamping groove is provided on the clamping portion. The first connecting portion and the second connecting portion are respectively fixedly connected to the valve seat. This structure is used to prevent the clamping groove from tilting after the stop plate is connected; or, the fixing plate includes a first connecting portion and a clamping portion for connecting the first connecting portion. The clamping portion is inclined, and the clamping groove is provided on the clamping portion. The first connecting portion is fixedly connected to the valve seat.

[0015] Further, the clamping groove is provided on the side of the fixing plate away from the valve seat. When the indoor environment is in a high-temperature state, this structure can shorten the time required for the fire check valve to play a role in fire and smoke isolation.

[0016] Further, the limiting channel is an oval hole, the long axis section of the oval hole is arranged vertically, and the short axis section of the oval hole is arranged horizontally; or, the limiting channel is a polygonal hole, and the vertical length of the polygonal hole > the horizontal length of the polygonal hole; or, the limiting channel is an irregularly shaped hole, and the vertical length of the irregularly shaped hole > the horizontal length of the irregularly shaped hole. This structure is to enable the stop plate to rotate axially along the limiting channel.

[0017] Further, the fusing component includes at least one fusing piece. The fusing piece includes a first fusing portion, a second fusing portion, and a third fusing portion for controlling the axial movement range of the stop plate on the fastening mechanism. The first fusing portion and the second fusing portion are respectively arranged on the fastening mechanism, and the third fusing portion is used to connect the first fusing portion and the second fusing portion; the fusing component includes at least one fusing ring, an installation hole is provided on the fusing ring, and the fusing ring is sleeved on the fastening mechanism and is used to control the axial movement range of the stop plate on the fastening mechanism; or, the fusing component includes at least one fusing piece and at least one fusing ring. The fusing piece includes a first fusing portion, a second fusing portion, and a third fusing portion for controlling the axial movement range of the stop plate on the fastening mechanism. The first fusing portion and the second fusing portion are respectively arranged on the fastening mechanism, and the third fusing portion is used to connect the first fusing portion and the second fusing portion. The fusing ring is clamped between the first fusing portion and the second fusing portion. The fusing piece is used to shorten the time required for the fusing component to transition from the working state to the non-working state, and the fusing ring is used to increase the working reliability of the fusing component; when the fusing component only includes the fusing ring (or the fusing component includes the fusing ring and the fusing piece, and the fusing ring is clamped between the first fusing portion and the second fusing portion), the fusing component will prevent the fire check valve from automatically failing in a low-temperature environment. The fusing component includes a first metal plate, a second metal plate, and a solder for connecting the first metal plate and the second metal plate. The first metal plate and the second metal plate are respectively arranged on the fastener. The gap between the first metal plate and the second metal plate in the axial direction of the fastener is the axial movement range of the stop plate on the fastener; both the first metal plate and the second metal plate are L-shaped. The first metal plate includes a first connecting portion and a first welding portion formed by bending the first connecting portion. The second metal plate includes a second connecting portion and a second welding portion formed by bending the second connecting portion. The first welding portion and the second welding portion are connected into one body through the solder. After the first welding portion and the second welding portion are connected into one body through the solder, the gap between the first connecting portion and the second connecting portion is the axial movement range of the stop plate on the fastener; a first avoidance hole for avoiding the fastener is provided on the first connecting portion, and a second avoidance hole for avoiding the fastener is provided on the second connecting portion. The aperture of the first avoidance hole > the aperture of the second avoidance hole, and the first connecting portion can abut against the stop plate.

[0018] Further, the fastening mechanism includes a screw, which sequentially passes through the fusing component and the stop plate and is threadedly connected to the base; or, the fastening mechanism includes a bolt and a nut, and the bolt sequentially passes through the fusing component, the stop plate and the base and is threadedly connected to the nut; or, the fastening mechanism includes a screw, which sequentially passes through the stop plate and the fusing component and is threadedly connected to the base; or, the fastening mechanism includes a bolt and a nut, and the bolt sequentially passes through the stop plate, the fusing component and the base and is threadedly connected to the nut; or, the fastening mechanism includes a bolt and a nut, and the bolt sequentially passes through the stop plate, the base and the fusing component and is threadedly connected to the nut. When the fastening mechanism includes a screw, the distance between the screw head and the base can be conveniently changed to adjust the clamping force received by the stop plate. When the fastening mechanism includes a bolt and a nut, the distance between the bolt head and the base can be conveniently changed to adjust the clamping force received by the stop plate; the nut can increase the connection strength between the bolt and the base. Description of the Drawings

[0019] Figure 1 is a perspective view of the locking structure in a preferred embodiment of the present invention;

[0020] Figure 2 is a top view of the locking structure in a preferred embodiment of the present invention;

[0021] Figure 3 is Figure 2 a cross-sectional view taken along line A-A in Embodiment 1;

[0022] Figure 4 is Figure 2 a cross-sectional view taken along line A-A in Embodiment 2;

[0023] Figure 5 is Figure 2 a cross-sectional view taken along line A-A in Embodiment 3;

[0024] Figure 6 is a perspective view of a partial locking structure in a preferred embodiment of the present invention;

[0025] Figure 7 is a cross-sectional view of the fusing component in Embodiment 4 of the present invention. Detailed Embodiments

[0026] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0027] Embodiment 1

[0028] See Figure 1 Figure 1 , the locking structure includes a base 1, a connecting rod 2, an elastic element, and a paddle 3. The connecting rod 2 and the paddle 3 are rotatably arranged on the base 1. One end of the elastic element is arranged on the base 1, and the other end of the elastic element is arranged on the paddle 3 and is used to drive the paddle 3 to rotate relative to the base 1.

[0029] It should be noted that: the existing elastic element is a torsion spring, and the torsion spring is sleeved on the rotating shaft of the paddle 3. When the torsion spring is sleeved on the rotating shaft of the paddle 3, one end of the torsion spring is fixed on the base 1 in a plug-in manner, and the other end of the torsion spring abuts against the upper end surface of the paddle 3. Since the elastic element is not the focus of the present invention, therefore, the structure of the elastic element and the connection structure between the elastic element and other components are not specifically limited in this embodiment. In other words, in this embodiment, the elastic element can be selected as a helical spring, and the elastic element can also be selected as a spring piece. The helical spring and the spring piece can be arranged on the base 1 and the paddle 3 in a manner different from the torsion spring, as long as the helical spring or the spring piece can drive the paddle 3 to rotate relative to the base.

[0030] See Figure 1 Figure 1 , the difference from the prior art is that: the locking structure of this embodiment further includes a fusing component, a fastening mechanism 41, and a stop plate 5. The fastening mechanism 41 is arranged on the base 1, the stop plate 5 is arranged on the fastening mechanism 41, and the stop plate 5 has a locking position and an unlocking position. When the fusing component 42 works, the fusing component fixes the stop plate 5 in the locking position so that the stop plate 5 prevents the paddle 3 from rotating relative to the base 1. After the fusing component does not work and the fusing component is separated from the stop plate 5, the elastic element pushes the stop plate 5 to the unlocking position through the paddle 3.

[0031] Combined with Figure 1 、 Figure 2 and Figure 3 Figure 3 , it can be seen that the fastening mechanism 41 slopes downward from the side away from the base 1 to the side close to the base 1. The fastening mechanism 41 is inclined to cooperate with the inclined setting of the clamping portion 121.

[0032] See Figure 1 and Figure 6 Figure 6 , a limiting channel 521 is provided on the stop plate 5. After the fusing component does not work, the stop plate 5 slides axially and / or rotates along the limiting channel 521. As can be known from the following text, the limiting channel 521 slides axially and / or rotates along the screw or bolt.

[0033] See Figure 3, a first anti-rotation portion 51 is provided at the upper end of the stop plate 5. The first anti-rotation portion 51 is provided on the stop plate 5 to prevent the stop plate 5 from rotating relative to the base 1. A second anti-rotation portion 53 is provided at the lower end of the stop plate 5. The second anti-rotation portion 53 is provided on the base 1 to prevent the stop plate 5 from rotating relative to the fastening mechanism 41. In other embodiments of the present invention, the stop plate may be provided with only the first anti-rotation portion.

[0034] See Figure 1 and Figure 3 , the base 1 of this embodiment includes a valve seat 11 and a fixing plate 12. A clamping groove 1211 is provided on the fixing plate 12. The second anti-rotation portion 53 is clamped in the clamping groove 1211. In other embodiments of the present invention, the base may include only the valve seat, or the base may include other components in addition to the valve seat and the fixing plate.

[0035] Preferably, the fixing plate 12 includes a first connecting portion 122, a second connecting portion 123, and a clamping portion 121 for connecting the first connecting portion 122 and the second connecting portion 123. The clamping portion 121 is inclined. The clamping groove 1211 is provided on the clamping portion 121. The first connecting portion 122 and the second connecting portion 123 are respectively fixedly connected to the valve seat 11. Designed in this way, the balance performance of the fixing plate after connecting the stop plate 5 can be improved. In addition, the inclined setting of the clamping portion 121 can increase the frictional resistance between the clamping portion 121 and the stop plate 5 and facilitate the rotation of the stop plate 5 relative to the fastening mechanism 41. In other embodiments of the present invention, the fixing plate includes a first connecting portion and a clamping portion for connecting the first connecting portion. The clamping portion is inclined. The clamping groove is provided on the clamping portion. The first connecting portion is fixedly connected to the valve seat.

[0036] From Figure 3 it can be seen that the clamping groove 1211 is provided on the side of the fixing plate 12 away from the valve seat 11.

[0037] From Figure 6 it can be seen that the limiting channel 521 is an oval hole. The long axis section of the oval hole is arranged vertically, and the short axis section of the oval hole is arranged horizontally. Designed in this way, the stop plate 5 can slide along the fastening mechanism 41, and the stop plate 5 can also rotate along the fastening mechanism 41. This means that when the stop plate 5 cannot slide along the fastening mechanism 41, the stop plate 5 can rotate around the fastening mechanism 41 to further increase the reliability of the operation of the dial 3. In other embodiments of the present invention, the limiting channel is a polygonal hole, and the vertical length of the polygonal hole > the horizontal length of the polygonal hole; or, the limiting channel is an irregularly shaped hole, and the vertical length of the irregularly shaped hole > the horizontal length of the irregularly shaped hole.

[0038] See Figure 3The fuse assembly of this embodiment includes at least one fuse piece 42, and the fuse piece 42 includes a first fuse part 422, a second fuse part 423 and a third fuse part 421 for controlling the axial movement range of the stop plate 5 on the fastening mechanism 41. The first fuse part 422 and the second fuse part 423 are respectively arranged on the fastening mechanism 41, and the third fuse part 421 is used to connect the first fuse part 422 and the second fuse part 423.

[0039] like Figure 3 As shown, when the fuse piece 42 is clamped between the stop plate 5 and the fastening mechanism 41, the stop plate 5 is in the locked position, and the fuse assembly is in the working state. After the fuse piece 42 is separated from the stop plate 5, the fuse assembly is in the non-working state. After the fuse piece 42 is separated from the stop plate 5, the paddle 3 pushes the stop plate 5 to move from the locked position to the unlocked position, and the stop plate 5 in the unlocked position will be separated from the paddle 3.

[0040] See also Figure 3 The fastening mechanism 41 of this embodiment has multiple options. For example, the fastening mechanism 41 includes a screw, which penetrates the fuse assembly and the stop plate 5 in sequence and is threadedly connected to the base 1; or, the fastening mechanism 41 includes a bolt and a nut, which penetrates the fuse assembly, the stop plate 5 and the base 1 in sequence and is threadedly connected to the nut; or, the fastening mechanism 41 includes a screw, which penetrates the stop plate 5 and the fuse assembly in sequence and is threadedly connected to the base 1; or, the fastening mechanism 41 includes a bolt and a nut, which penetrates the stop plate 5, the fuse assembly and the base 1 in sequence and is threadedly connected to the nut; or, the fastening mechanism 41 includes a bolt and a nut, which penetrates the stop plate 5, the base 1 and the fuse assembly in sequence and is threadedly connected to the nut.

[0041] In this embodiment, the fuse piece 42 can be made of one or more fusible solders such as bismuth-based, indium-based, tin-based, cadmium-based, zinc-based and lead-based.

[0042] Embodiment 2

[0043] The difference from the first embodiment is that the present embodiment makes structural improvements to the fuse assembly.

[0044] See also Figure 4 In this embodiment, the fuse assembly includes at least one fuse piece 42 and at least one fuse ring 43. The fuse piece 42 includes a first fuse portion 422, a second fuse portion 423 and a third fuse portion 421 for controlling the axial movement range of the stop plate 5 on the fastening mechanism 41. The first fuse portion 422 and the second fuse portion 423 are respectively arranged on the fastening mechanism 41. The third fuse portion 421 is used to connect the first fuse portion 422 and the second fuse portion 423. The fuse ring 43 is clamped between the first fuse portion 422 and the second fuse portion 423.

[0045] Embodiment 3

[0046] The difference from the first embodiment is that in this embodiment, the structure of the fusing component is improved.

[0047] See Figure 5 , in this embodiment, the fusing component includes at least one fusing ring 43. The fusing ring 43 is provided with mounting holes, and the fusing ring 43 is sleeved on the fastening mechanism 41 and used to control the axial movement range of the stop plate 5 on the fastening mechanism 41.

[0048] Embodiment Four

[0049] The difference from the first embodiment is that in this embodiment, the structure of the fusing component is improved.

[0050] See Figure 7 , in this embodiment, the fusing component includes a first metal plate 441, a second metal plate 442, and a solder 443 for connecting the first metal plate 441 and the second metal plate 442. The first metal plate 441 and the second metal plate 442 are respectively arranged on the fastener 41. The gap between the first metal plate 441 and the second metal plate 442 in the axial direction of the fastener 41 is the axial movement range of the stop plate 5 on the fastener 41. Specifically: both the first metal plate 441 and the second metal plate 442 are L-shaped. The first metal plate 441 includes a first connecting portion 4411 and a first welding portion 4412 formed by bending the first connecting portion 4411. The second metal plate 442 includes a second connecting portion 4421 and a second welding portion 4422 formed by bending the second connecting portion 4421. The first welding portion 4421 and the second welding portion 4422 are connected into one body by the solder 443. After the first welding portion 4412 and the second welding portion 4422 are connected into one body by the solder 443, the gap between the first connecting portion 4411 and the second connecting portion 4412 is the axial movement range of the stop plate 5 on the fastener 41. The advantage of the L-shaped first metal plate 441 and the L-shaped second metal plate 442 is that they can cover the head of the fastener 41, that is, the head of the screw or the head of the bolt, and reduce the probability of the head of the fastener 41 hitting other components. In other embodiments of the present invention, the first metal plate can be "concave-shaped", and the second metal plate can be "one-shaped"; or, the first metal plate is "U-shaped", and the second metal plate is "Y-shaped".

[0051] In this embodiment, by changing the thrust of the stop plate 5 acting on the fusing component, the service life of the fusing component is increased.

[0052] In this embodiment, a first avoidance hole 4413 for avoiding the fastener 41 is provided on the first connecting portion 4411, a second avoidance hole 4423 for avoiding the fastener 41 is provided on the second connecting portion 4421, the aperture of the first avoidance hole 4413 > the aperture of the second avoidance hole 4423, and the first connecting portion 4411 can abut against the stop plate 5. This structure facilitates the rotation of the stop plate 5 relative to the first avoidance hole 4413.

[0053] As described above, only the specific embodiments of the present invention are given, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. Locking structure, comprising a base, a connecting rod, an elastic element and a paddle. The connecting rod and the paddle are rotatably arranged on the base. One end of the elastic element is arranged on the base, and the other end of the elastic element is arranged on the paddle and used to drive the paddle to rotate relative to the base. It is characterized in that, The locking structure further includes a fusing component, a fastening mechanism, and a stop plate. The fastening mechanism is disposed on the base, and the stop plate is disposed on the fastening mechanism. The stop plate has a locking position and an unlocking position. When the fusing component operates, the fusing component fixes the stop plate at the locking position to prevent the paddle from rotating relative to the base. After the fusing component does not operate and is separated from the stop plate, the elastic element pushes the stop plate to the unlocking position through the paddle; The base includes a valve seat and a fixing plate, and a card slot is provided on the fixing plate; A first anti-rotation portion is provided at the upper end of the stop plate, and the first anti-rotation portion is disposed on the paddle to prevent the paddle from rotating relative to the base; A second anti-rotation portion is provided at the lower end of the stop plate, and the second anti-rotation portion is snap-fitted in the card slot; Wherein, a limiting channel is provided on the stop plate. After the fusing component does not operate, the stop plate axially slides and / or rotates along the limiting channel.

2. The locking structure according to claim 1, characterized in that, The fastening mechanism is inclined downward from the side away from the base to the side close to the base.

3. The locking structure according to claim 1, characterized in that, The second anti-rotation portion is provided on the base to prevent the stop plate from rotating relative to the fastening mechanism.

4. The locking structure according to claim 1, characterized in that, The fixing plate includes a first connecting portion, a second connecting portion, and a clamping portion for connecting the first connecting portion and the second connecting portion. The clamping portion is inclined, the card slot is provided on the clamping portion, and the first connecting portion and the second connecting portion are respectively fixedly connected to the valve seat; or, the fixing plate includes a first connecting portion and a clamping portion for connecting the first connecting portion. The clamping portion is inclined, the card slot is provided on the clamping portion, and the first connecting portion is fixedly connected to the valve seat.

5. The locking structure according to claim 1, characterized in that, The card slot is provided on the side of the fixing plate away from the valve seat.

6. The locking structure according to claim 1, characterized in that, The limiting channel is an oval hole, the long axis section of the oval hole is arranged vertically, and the short axis section of the oval hole is arranged horizontally; or, the limiting channel is a polygonal hole, and the vertical length of the polygonal hole > the horizontal length of the polygonal hole; or, the limiting channel is an irregularly shaped hole, and the vertical length of the irregularly shaped hole > the horizontal length of the irregularly shaped hole.

7. The locking structure according to claim 1, characterized in that, The fusing component includes at least one fuse piece. The fuse piece includes a first fusing portion, a second fusing portion, and a third fusing portion for controlling the axial movement range of the stop plate on the fastening mechanism. The first fusing portion and the second fusing portion are respectively arranged on the fastening mechanism, and the third fusing portion is used to connect the first fusing portion and the second fusing portion; the fusing component includes at least one fusing ring, an installation hole is provided on the fusing ring, and the fusing ring is sleeved on the fastening mechanism and used to control the axial movement range of the stop plate on the fastening mechanism; or, the fusing component includes at least one fuse piece and at least one fusing ring. The fuse piece includes a first fusing portion, a second fusing portion, and a third fusing portion for controlling the axial movement range of the stop plate on the fastening mechanism. The first fusing portion and the second fusing portion are respectively arranged on the fastening mechanism, and the third fusing portion is used to connect the first fusing portion and the second fusing portion. The fusing ring is clamped between the first fusing portion and the second fusing portion; the fusing component includes a first metal plate, a second metal plate, and a solder for connecting the first metal plate and the second metal plate. The first metal plate and the second metal plate are respectively arranged on the fastening mechanism. The gap between the first metal plate and the second metal plate in the axial direction of the fastening mechanism is the axial movement range of the stop plate on the fastening mechanism; both the first metal plate and the second metal plate are L-shaped. The first metal plate includes a first connecting portion and a first welding portion formed by bending the first connecting portion. The second metal plate includes a second connecting portion and a second welding portion formed by bending the second connecting portion. The first welding portion and the second welding portion are connected into one body by the solder. After the first welding portion and the second welding portion are connected into one body by the solder, the gap between the first connecting portion and the second connecting portion is the axial movement range of the stop plate on the fastening mechanism; a first avoidance hole for avoiding the fastening mechanism is provided on the first connecting portion, a second avoidance hole for avoiding the fastening mechanism is provided on the second connecting portion, the aperture of the first avoidance hole > the aperture of the second avoidance hole, and the first connecting portion can abut against the stop plate.

8. The locking structure according to claim 1, characterized in that, The fastening mechanism includes a screw, and the screw sequentially passes through the fusing component and the stop plate and then is threadedly connected to the base; or, the fastening mechanism includes a bolt and a nut, and the bolt sequentially passes through the fusing component, the stop plate, and the base and then is threadedly connected to the nut; or, the fastening mechanism includes a screw, and the screw sequentially passes through the stop plate and the fusing component and then is threadedly connected to the base; or, the fastening mechanism includes a bolt and a nut, and the bolt sequentially passes through the stop plate, the fusing component, and the base and then is threadedly connected to the nut; or, the fastening mechanism includes a bolt and a nut, and the bolt sequentially passes through the stop plate, the base, and the fusing component and then is threadedly connected to the nut.

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