Moving contact knife structure and knife switch

Abstract

The utility model belongs to the technical field of switch cabinets, and discloses a movable contact knife structure and a knife switch. The moving contact knife structure comprises a first moving contact knife and a second moving contact knife which are oppositely arranged, a sleeve and a counter-locking assembly, the first end of the sleeve is embedded in the first moving contact knife, and an elastic piece is arranged in the sleeve; the first end of the counter-locking assembly is embedded in the sleeve, the second end of the counter-locking assembly is embedded in the second movable contact knife, and the first end and the second end of the counter-locking assembly are connected to extrude the elastic piece. The first end of the sleeve is embedded in the first movable contact knife, the first end of the counter-locking assembly is embedded in the sleeve, the second end of the counter-locking assembly is embedded in the second movable contact knife, the sleeve, the elastic piece and the counter-locking assembly cannot protrude out of the outer surfaces of the first movable contact knife and the second movable contact knife, and the actual net electric gap between the two-phase movable contact knives is prevented from being reduced. And electric field distortion during operation of the switch is avoided, a voltage-sharing cover is not needed, and the insulation performance of the switch is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of switch cabinets, in particular to a moving contact blade structure and a knife-switch type switch. Background Art

[0002] A knife-switch type switch is a commonly used power switch device. In the switch, two moving contact blades connected to each static contact belong to the same phase and jointly carry the current of this phase. During the closing process, the static contact is clamped between the two moving contact blades, and the moving contact blade needs to apply a certain clamping force to the static contact to meet the electrical connection reliability between the moving contact blade and the static contact; and the clamping force needs to be adjustable to avoid the switch being unable to open due to excessive clamping force.

[0003] In the prior art, an elastic member is installed on the outer side of each of the two moving contact blades in the same phase and connected by a prying bolt. By adjusting the tightness of the nut, the compression amount of the elastic member is changed, so as to achieve the purpose of adjusting the clamping force. However, the structure with the elastic member and the bolt outside makes the actual net electrical clearance between the two-phase moving contact blades decrease, and the irregular structure at the end of the bolt protrudes outside the moving contact blade, resulting in great electric field distortion, leading to a reduction in the insulation performance of the switch; usually, it is necessary to solve this problem by installing a grading ring on the bolt or directly increasing the distance between the moving contact blades. The effect of setting the grading ring is very little, and if the distance between the moving contact blades is directly increased, the cabinet size and cost will be greatly increased.

[0004] That is, in the prior art, the structure with the elastic member and the bolt outside has the disadvantages that the actual net electrical clearance between the two-phase moving contact blades decreases and the irregular structure at the end of the bolt protrudes outside the moving contact blade, resulting in great electric field distortion and low insulation performance of the switch. Content of the Utility Model

[0005] The purpose of the utility model is to provide a moving contact blade structure and a knife-switch type switch to solve the problems that in the prior art, the structure with the elastic member and the bolt outside makes the actual net electrical clearance between the two-phase moving contact blades decrease and the irregular structure at the end of the bolt protrudes outside the moving contact blade, resulting in great electric field distortion and low insulation performance of the switch.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a moving contact blade structure, which includes:

[0008] A first moving contact blade and a second moving contact blade which are oppositely arranged;

[0009] A sleeve, the first end of the sleeve is embedded in the first moving contact blade, and an elastic member is arranged in the sleeve;

[0010] For the locking component, the first end of the locking component is embedded in the sleeve, the second end of the locking component is embedded in the second moving contact blade, and the first end and the second end of the locking component are connected to squeeze the elastic member.

[0011] As an alternative technical solution of the moving contact blade structure, the first moving contact blade is provided with a first stepped hole, and the sleeve further includes:

[0012] A cylinder body, the first end of the cylinder body passes through the first stepped hole;

[0013] A flange, connected to and radially protruding from the second end of the cylinder body, and the flange is engaged in the first stepped hole.

[0014] As an alternative technical solution of the moving contact blade structure, a protrusion is provided on the outer side surface of the second end of the cylinder body, and the protrusion is in interference fit with the first stepped hole.

[0015] As an alternative technical solution of the moving contact blade structure, the outer diameter of the second end of the cylinder body is greater than the outer diameter of the first end, and the second end of the cylinder body is in interference fit with the hole wall of the first stepped hole.

[0016] As an alternative technical solution of the moving contact blade structure, the locking component includes:

[0017] An abutting member, at least part of the abutting member is placed in the sleeve;

[0018] A locking member, the first end of the locking member passes through the second moving contact blade and is screwed with the abutting member, so that the elastic member is squeezed, and the second end is embedded in the second moving contact blade.

[0019] As an alternative technical solution of the moving contact blade structure, both ends of the elastic member abut against the abutting member and the second end of the sleeve, or both ends of the elastic member abut against the abutting member and the locking member.

[0020] As an alternative technical solution of the moving contact blade structure, the second moving contact blade is provided with a second stepped hole, and the second end of the locking member is engaged in the second stepped hole.

[0021] As an alternative technical solution of the moving contact blade structure, the second end of the sleeve protrudes from the first moving contact blade and is located between the first moving contact blade and the second moving contact blade.

[0022] As an alternative technical solution of the moving contact blade structure, raised contacts are provided on the opposite inner sides of the first moving contact blade and the second moving contact blade, and the two raised contacts are used to press the static contact.

[0023] The utility model provides a knife-switch, which includes a static contact and the moving contact blade structure, and the static contact is located between the first moving contact blade and the second moving contact blade.

[0024] Beneficial effects:

[0025] The utility model provides a moving contact blade structure, which includes a first moving contact blade and a second moving contact blade arranged oppositely, a sleeve and an interlocking assembly. The first end of the sleeve is embedded in the first moving contact blade, and an elastic member is arranged inside the sleeve; the first end of the interlocking assembly is embedded in the sleeve, the second end of the interlocking assembly is embedded in the second moving contact blade, and the first end and the second end of the interlocking assembly are connected to squeeze the elastic member. The first moving contact blade and the second moving contact blade jointly carry the current of the same phase. The first end of the sleeve is embedded in the first moving contact blade, the elastic member is arranged inside the sleeve, and the first end of the interlocking assembly is embedded in the sleeve and the second end is embedded in the second moving contact blade, so that the sleeve, the elastic member and the interlocking assembly are arranged inside the first moving contact blade and the second moving contact blade and do not protrude from the outer surfaces of the first moving contact blade and the second moving contact blade. The first moving contact blade and the second moving contact blade can play an electric field shielding role for the elastic member and the interlocking assembly, which can not only avoid the reduction of the actual net electrical gap between the two-phase moving contact blades, but also avoid the formation of electric field distortion during the operation of the switch. There is no need to set an equalizing cover, which improves the insulation performance of the switch; the first end and the second end of the interlocking assembly are connected to squeeze the elastic member. Adjusting the interlocking assembly can change the compression amount of the elastic member, and further can adjust the clamping force between the first moving contact blade and the second moving contact blade, avoiding the inability to open the switch due to excessive clamping force.

[0026] The utility model provides a knife-switch, which includes a static contact and a moving contact blade structure, and the static contact is located between the first moving contact blade and the second moving contact blade. By arranging the moving contact blade structure, the sleeve, the elastic member and the interlocking assembly are hidden inside the first moving contact blade and the second moving contact blade, with a simple structure and effectively improving the insulation performance of the knife-switch. Description of the drawings

[0027] Figure 1 is a partial cross-sectional view of the moving contact blade structure and the static contact provided by an embodiment of the utility model;

[0028] Figure 2 is an exploded view of the moving contact blade structure and the static contact provided by an embodiment of the utility model;

[0029] Figure 3 is a schematic structural diagram of the sleeve provided by an embodiment of the utility model Figure 1 ;

[0030] Figure 4 is a schematic structural diagram of the sleeve provided by an embodiment of the utility model Figure 2 。

[0031] In the figure:

[0032] 100, static contact

[0033] 1a, first moving contact blade; 1b, second moving contact blade; 11, first stepped hole; 12, second stepped hole; 13, convex contact

[0034] 20, sleeve; 21, cylinder body; 211, protrusion; 212, through hole; 22, flange

[0035] 30, elastic member; 40, abutting member; 50, locking member Detailed implementation manner

[0036] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the present utility model are shown in the accompanying drawings, rather than all the structures.

[0037] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0040] As Figures 1 to 4 shown, on the one hand, this embodiment provides a knife-switch, which includes a static contact 100 and a moving contact blade structure. The static contact 100 is located between a first moving contact blade 1a and a second moving contact blade 1b of the moving contact blade structure.

[0041] On the other hand, this embodiment provides a moving contact blade structure, which includes a first moving contact blade 1a and a second moving contact blade 1b arranged oppositely, a sleeve 20, and a locking assembly. The first end of the sleeve 20 is embedded in the first moving contact blade 1a, and an elastic member 30 is arranged in the sleeve 20; the first end of the locking assembly is embedded in the sleeve 20, the second end of the locking assembly is embedded in the second moving contact blade 1b, and the first end and the second end of the locking assembly are connected to squeeze the elastic member 30.

[0042] The first moving contact blade 1a and the second moving contact blade 1b jointly carry the current of the same phase. The first end of the sleeve 20 is embedded in the first moving contact blade 1a, the elastic member 30 is arranged in the sleeve 20, and the first end of the locking assembly is embedded in the sleeve 20 and the second end is embedded in the second moving contact blade 1b, so that the sleeve 20, the elastic member 30, and the locking assembly are built in the first moving contact blade 1a and the second moving contact blade 1b and do not protrude from the outer surfaces of the first moving contact blade 1a and the second moving contact blade 1b. The first moving contact blade 1a and the second moving contact blade 1b can play an electric field shielding role for the elastic member 30 and the locking assembly, which can not only avoid the reduction of the actual net electrical gap between the two-phase moving contact blades, but also avoid the formation of electric field distortion during the operation of the switch, without the need to set a grading ring, improving the insulation performance of the switch; the first end and the second end of the locking assembly are connected to squeeze the elastic member 30. Adjusting the locking assembly can change the compression amount of the elastic member 30, and further can adjust the clamping force between the first moving contact blade 1a and the second moving contact blade 1b, avoiding the inability to open the switch due to excessive clamping force.

[0043] By setting a knife-switch with a moving contact blade structure, the sleeve 20, the elastic member 30, and the locking assembly are hidden in the first moving contact blade 1a and the second moving contact blade 1b, with a simple structure and effectively improving the insulation performance of the knife-switch.

[0044] Optionally, both the first moving contact blade 1a and the second moving contact blade 1b are in a sheet shape; the planes where the first moving contact blade 1a and the second moving contact blade 1b are located are parallel; the first moving contact blade 1a and the second moving contact blade 1b are relatively spaced apart in the horizontal direction; the first moving contact blade 1a and the second moving contact blade 1b are made of copper.

[0045] In this embodiment, the first movable contact blade 1a has a first outer side surface and a first inner side surface on both sides respectively, the first outer side surface is located on the side of the first movable contact blade 1a away from the second movable contact blade 1b, and the first inner side surface is located on the side of the first movable contact blade 1a facing the second movable contact blade 1b; the second movable contact blade 1b has a second outer side surface and a second inner side surface on both sides respectively, the second outer side surface is located on the side of the second movable contact blade 1b away from the first movable contact blade 1a, and the second inner side surface is located on the side of the second movable contact blade 1b facing the first movable contact blade 1a; that is, the first outer side surface and the second outer side surface are back to back with each other, and the first inner side surface and the second inner side surface are opposite to each other.

[0046] In this embodiment, the sleeve 20 is embedded in the first movable contact blade 1a and is located between the first outer side surface and the second outer side surface, and the locking assembly is also located between the first outer side surface and the second outer side surface.

[0047] Optionally, the inner sides of the first movable contact blade 1a and the second movable contact blade 1b are both provided with raised contacts 13, and the two raised contacts 13 are used to press the static contact 100. In this embodiment, the first inner side surface and the second inner side surface are both provided with raised contacts 13, and the raised contacts 13 are located at the top of the first movable contact blade 1a or the second movable contact blade 1b.

[0048] By arranging a raised contact 13 on the first moving contact blade 1a and the second moving contact blade 1b, the raised contact 13 contacts the stationary contact 100. The design of the raised contact 13 can improve the contact stability and better adapt to the slight position changes of the moving contact blade and the stationary contact 100. Even if the first moving contact blade 1a or the second moving contact blade 1b and the stationary contact 100 vibrate or displace slightly during the use of the switch, good electrical contact can be maintained, thereby minimizing the possibility of poor contact.

[0049] Specifically, a first stepped hole 11 is provided on the first movable contact blade 1a, and the sleeve 20 also includes a cylinder body 21 and a flange 22. The first end of the cylinder body 21 passes through the first stepped hole 11; the flange 22 is connected to and radially protrudes from the second end of the cylinder body 21, and the flange 22 is engaged in the first stepped hole 11.

[0050] By setting the first stepped hole 11, the flange 22 of the sleeve 20 is engaged in the first stepped hole 11, which can prevent the flange 22 from protruding from the first outer side surface of the first movable contact knife 1a and limit the relative position of the sleeve 20 and the first movable contact knife 1a.

[0051] To fix the sleeve 20 on the first moving contact blade 1a, a protrusion 211 is provided on the outer side of the second end of the cylinder body 21, and the protrusion 211 is in interference fit with the hole wall of the first stepped hole 11. By providing the protrusion 211, the sleeve 20 is in interference fit with the first stepped hole 11, thereby fixing the sleeve 20 on the first moving contact blade 1a and preventing relative rotation or movement between the sleeve 20 and the first moving contact blade 1a after installation, which may affect the subsequent installation of the locking assembly.

[0052] Optionally, the outer diameter of the second end of the cylinder body 21 is larger than that of the first end, and the second end of the cylinder body 21 is in interference fit with the hole wall of the first stepped hole 11. It is also possible to set the outer diameter of the second end of the cylinder body 21 to be larger so that the second end of the cylinder body 21 can be in interference fit with the hole wall of the first stepped hole 11.

[0053] In this embodiment, the cylinder body 21 is in the shape of a cylindrical straight tube, and a protrusion 211 is provided on the outer side of the second end; there are multiple protrusions 211, and the multiple protrusions 211 are arranged in an array and evenly spaced around the outer circumference of the second end of the cylinder body 21; the sleeve 20 can be installed by press riveting.

[0054] Optionally, the first end of the cylinder body 21 protrudes from the first moving contact blade 1a and is located between the first moving contact blade 1a and the second moving contact blade 1b. In this embodiment, the first end of the cylinder body 21 passes through the first stepped hole 11 and extends towards the second moving contact blade 1b, and the first end of the cylinder body 21 protrudes from the first inner side and extends between the first inner side and the second inner side; the minimum distance between the first inner side and the second inner side is equal to or greater than the length of the cylinder body 21 protruding from the first inner side.

[0055] By arranging the cylinder body 21 to partially extend between the first moving contact blade 1a and the second moving contact blade 1b, the sleeve 20 can play a limiting role. Using the sleeve 20 to limit the distance between the first moving contact blade 1a and the second moving contact blade 1b can prevent excessive tightening of the locking assembly and resulting in excessive clamping force.

[0056] Furthermore, the locking assembly includes an abutting member 40 and a locking member 50. At least a part of the abutting member 40 is placed inside the sleeve 20; the first end of the locking member 50 passes through the second moving contact blade 1b and is screwed to the abutting member 40, so that the elastic member 30 is compressed, and the second end of the locking member 50 is embedded in the second moving contact blade 1b.

[0057] After installing the sleeve 20 on the first moving contact blade 1a, place the elastic member 30 inside the sleeve 20, insert the abutting member 40 and the locking member 50 through the first outer side and the second outer side respectively, and screw the abutting member 40 and the locking member 50 together, thereby locking the first moving contact blade 1a and the second moving contact blade 1b together.

[0058] Optionally, the elastic member 30 can be a spring; the abutting member 40 can be a clamping plate bolt, and the locking member 50 can be a clamping plate nut. The abutting member 40 is threadedly connected to the locking member 50.

[0059] In this embodiment, the clamping plate bolt penetrates into the sleeve 20 from the first outer side, and the clamping plate nut penetrates into the second moving contact blade 1b from the second outer side. In other embodiments, the clamping plate nut can also penetrate into the sleeve 20 from one side, and the clamping plate bolt can penetrate into the second moving contact blade 1b from the other side.

[0060] In this embodiment, the second moving contact blade 1b is provided with a second stepped hole 12. The first end of the locking member 50 passes through the second stepped hole 12, and the second end of the locking member 50 is engaged in the second stepped hole 12; both the first stepped hole 11 and the second stepped hole 12 are circular through holes, and the axial directions of the first stepped hole 11 and the second stepped hole 12 coincide. By providing the second stepped hole 12 on the second moving contact blade 1b, it is possible to limit the relative positions of the locking member 50 and the second moving contact blade 1b, and also to prevent the end of the locking member 50 from protruding from the second outer side.

[0061] Further, a through hole 212 is provided at the first end of the cylinder body 21. The first end of the elastic member 30 abuts against the inner side of the end face of the first end of the cylinder body 21. The first end of the abutting member 40 passes through the elastic member 30 and the second end presses against the second end of the elastic member 30. The first end of the locking member 50 sequentially passes through the through hole 212 and the elastic member 30 and is screwed to the abutting member 40.

[0062] By providing the through hole 212 at the end of the cylinder body 21, it is possible to abut the elastic member 30 against the inner side of the end face of the first end of the cylinder body 21, and also to realize the connection between the abutting member 40 and the locking member 50; the locking member 50 is docked by the sleeve 20 to initially limit the position of the locking member 50, which is convenient for further tightening the abutting member 40; the elastic member 30 is sleeved outside the locking member 50, so that the setting position of the elastic member 30 can be limited by the locking member 50 to prevent the elastic member 30 from shifting, which helps to stably press the elastic member 30 against the sleeve 20 when the abutting member 40 is inserted.

[0063] In this embodiment, the first end of the locking member 50 is provided with a threaded hole, and at least a part of the first end of the abutting member 40 is inserted into the threaded hole and screwed to the locking member 50. In other embodiments, it is also possible to arrange the first end of the abutting member 40 to pass through the elastic member 30 and pass through the sleeve 20 from the through hole 212, and arrange the abutting member 40 to extend outside the sleeve 20 and be screwed to the locking member 50.

[0064] In this embodiment, two ends of the elastic member 30 respectively abut against the abutting member 40 and the sleeve 20, and the elastic force of the elastic member 30 is transmitted to the first moving contact blade 1a through the sleeve 20; in other embodiments, the first end of the abutting member 40 may also be disposed to penetrate through the elastic member 30, the first end of the abutting member 40 is screwed to the locking member 50, and the second end of the abutting member 40 presses the elastic member 30 against the end of the locking member 50, so that two ends of the elastic member 30 abut against the abutting member 40 and the locking member 50, and the elastic force of the elastic member 30 is transmitted to the first moving contact blade 1a and the second moving contact blade 1b through the abutting member 40 and the locking member 50.

[0065] To limit the elastic member 30, the through hole 212 is located at the central position of the end of the first end of the cylinder body 21, and the difference between the inner diameter of the cylinder body 21 and the outer diameter of the first end of the locking member 50 is greater than the difference between the outer diameter and the inner diameter of the elastic member 30 itself. By limiting the position and size of the through hole 212, the locking member 50 is inserted into the cylinder body 21 from the central position of the end of the cylinder body 21, and the elastic member 30 can be installed between the inner wall of the cylinder body 21 and the outer side of the first end of the locking member 50.

[0066] In this embodiment, the sleeve 20 is generally U-shaped, the sleeve 20 has a receiving hole and a through hole 212, the through hole 212 penetrates through the central position of the bottom of the sleeve 20, and the receiving hole and the through hole 212 are communicated with each other to penetrate through the sleeve 20; the hole wall of the receiving hole is the inner wall of the cylinder body 21, and the inner diameter of the cylinder body 21 is the diameter of the receiving hole.

[0067] Specifically, both the receiving hole and the through hole 212 are circular holes and their axes coincide; the diameter of the receiving hole is greater than the diameter of the through hole 212, the diameter of the through hole 212 is slightly larger than the outer diameter of the screw of the locking member 50, and the screw of the locking member 50 can be inserted into the sleeve 20 from the through hole 212; the diameter of the receiving hole is slightly larger than the outer diameter of the elastic member 30 and the maximum outer diameter of the head of the abutting member 40; the inner diameter of the elastic member 30 is slightly larger than the outer diameter of the screw of the locking member 50. By limiting the sizes of the sleeve 20, the elastic member 30 and the locking assembly, flexible cooperation between each part can be achieved.

[0068] The following is the specific installation and use process of the moving contact blade structure:

[0069] First, install the sleeve 20 in the first stepped hole 11 of the first moving contact blade 1a, place the elastic member 30 inside the sleeve 20, insert the abutting member 40 and the locking member 50 from the first outer side and the second outer side respectively, part of the abutting member 40 is inserted into the elastic member 30 and presses the elastic member 30 against the sleeve 20, the locking member 50 is inserted into the second stepped hole 12 and passes through the through hole 212 of the sleeve 20, the end of the locking member 50 is inserted into the sleeve 20, and the abutting member 40 and the locking member 50 are tightened.

[0070] When it is necessary to adjust the clamping force of the first movable contact blade 1a and the second movable contact blade 1b on the static contact 100, only the tightness of the abutting member 40 and the locking member 50 needs to be adjusted. If it is necessary to increase the clamping force, the abutting member 40 can be appropriately tightened to increase the compression amount of the elastic member 30. The elastic member 30 forms a greater supporting force on the sleeve 20 and the abutting member 40. Since the sleeve 20 is connected to the first movable contact blade 1a and the abutting member 40 is connected to the second movable contact blade 1b through the locking member 50, the first movable contact blade 1a and the second movable contact blade 1b tend to approach each other, and the static contact 100 is pressed by the convex contacts 13 at the tops of the first movable contact blade 1a and the second movable contact blade 1b. On the contrary, if it is necessary to reduce the clamping force, only the abutting member 40 and the locking member 50 need to be appropriately loosened.

[0071] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Moving contact blade structure, characterized in that, Comprising: Relatively arranged first moving contact blades (1a) and second moving contact blades (1b); A sleeve (20), the first end of the sleeve (20) being embedded in the first moving contact blade (1a), and an elastic member (30) being provided inside the sleeve (20); An interlocking assembly, the first end of the interlocking assembly being embedded in the sleeve (20), the second end of the interlocking assembly being embedded in the second moving contact blade (1b), and the first end and the second end of the interlocking assembly being connected to squeeze the elastic member (30).

2. The moving contact blade structure according to claim 1, wherein A first stepped hole (11) is provided on the first moving contact blade (1a), and the sleeve (20) further includes: A cylinder body (21), the first end of the cylinder body (21) passing through the first stepped hole (11); A flange (22), connected to and radially protruding from the second end of the cylinder body (21), and the flange (22) being engaged in the first stepped hole (11).

3. The moving contact blade structure according to claim 2, wherein, A protrusion (211) is provided on the outer side surface of the second end of the cylinder body (21), and the protrusion (211) is in interference fit with the hole wall of the first stepped hole (11).

4. The moving contact blade structure according to claim 2, wherein The outer diameter of the second end of the cylinder body (21) is greater than that of the first end, and the second end of the cylinder body (21) is in interference fit with the hole wall of the first stepped hole (11).

5. The moving contact blade structure according to claim 1, wherein, The interlocking assembly includes: A contact member (40), at least part of the contact member (40) being placed inside the sleeve (20); A locking member (50), the first end of the locking member (50) passing through the second moving contact blade (1b) and being screwed to the contact member (40) to squeeze the elastic member (30), and the second end being embedded in the second moving contact blade (1b).

6. The moving contact blade structure according to claim 5, wherein Both ends of the elastic member (30) are in contact with the contact member (40) and the second end of the sleeve (20), or both ends of the elastic member (30) are in contact with the contact member (40) and the locking member (50).

7. The moving contact blade structure according to claim 5, wherein, A second stepped hole (12) is provided on the second moving contact blade (1b), and the second end of the locking member (50) is engaged in the second stepped hole (12).

8. The moving contact blade structure according to claim 1, characterized in that, The second end of the sleeve (20) protrudes from the first moving contact blade (1a) and is located between the first moving contact blade (1a) and the second moving contact blade (1b).

9. The moving contact blade structure according to claim 1, wherein, Protruding contact points (13) are provided on the relatively inner sides of the first moving contact blade (1a) and the second moving contact blade (1b), and the two protruding contact points (13) are used to press the static contact (100).

10. Knife-switch, characterized in that, Comprising a static contact (100) and a moving contact blade structure according to any one of claims 1-9, the static contact (100) being located between the first moving contact blade (1a) and the second moving contact blade (1b).

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