A safety knife switch for electric cabinets used in power operation and maintenance

Abstract

The present application relates to the field of circuit switches, and in particular to a safety knife switch for electric cabinets used for power operation and maintenance. It includes a fixed plate, a flip blade, and a fixed card. The fixed card includes an L-shaped elastic metal sheet, a rectangular contact metal sheet, and a first rectangular grinding sheet that are symmetrically arranged on both sides of the flip blade in pairs. The L-shaped elastic metal sheet is fixedly connected to the fixed plate, and the rectangular contact metal sheet and the first rectangular grinding sheet are respectively fixedly connected to one side of the L-shaped elastic metal sheet close to the flip blade. The first rectangular grinding sheet is located above the rectangular contact metal sheet, and the spacing of the first rectangular grinding sheet and the spacing of the rectangular metal contact sheet are less than the thickness of the flip blade. When the flip blade flips downward, the flip blade is first inserted between the first rectangular grinding sheets, and the first rectangular grinding sheet grinds the contact surface of the flip blade. After the flip blade passes downward through the first rectangular grinding sheet, it is inserted between the rectangular contact metal sheets, and the rectangular contact metal sheet contacts the contact surface of the flip blade.

Description

Technical Field

[0001] The present application relates to the field of circuit switches, and in particular to a safety knife switch for an electric cabinet used for power operation and maintenance. Background Art

[0002] A circuit breaker is an electrical device used to control the on and off of a circuit, and a knife switch is a mechanical circuit switch.

[0003] A knife switch is usually mainly composed of two flip blades and two fixed cards. One end of the two flip blades is connected to the input neutral line and the input live line respectively, and the two fixed cards are connected to the output neutral line and the output live line respectively. The two flip blades flip synchronously. After flipping downward, they contact the two fixed cards respectively to make the input live line and the output live line conductive and the input neutral line and the output neutral line conductive, thereby achieving circuit conduction. After flipping upward, the flip blades are separated from the fixed cards to achieve circuit disconnection.

[0004] In the electric cabinets of power operation and maintenance, air switches and knife switches are usually equipped. The air switch has an overload protection function, but the mechanical knife switch has advantages that automatic control switches cannot match, such as intuitiveness and high reliability. The staff can intuitively judge the switching state of the knife switch. The switching state will not change due to other factors when there is no manual switching. It has high reliability, low cost and long service life.

[0005] However, after the knife switch in the prior art has been used for a long time, the contact resistance of the flip blade and the fixed card surface will change due to the oxide layer, attached dirt, etc., and it may even be impossible to effectively energize when in contact. When the contact resistance increases, it is easy to melt or even cause a fire due to the electrothermal effect, so the reliability is reduced and there is a safety hazard. Summary of the invention

[0006] In view of this, a safety knife switch for electric cabinets used in power operation and maintenance is proposed, which can automatically remove the oxide layer and attached dirt on the contact surface of the flip blade and the fixed card during the switch state switching process, thereby improving reliability and safety.

[0007] The present application provides a safety knife switch for electric cabinets used for power operation and maintenance, comprising a fixed plate, a flip blade, and a fixed card, wherein one end of the flip blade is rotatably connected to the upper surface of the fixed plate, the fixed card is fixedly connected to the upper surface of the fixed plate, and the flip blade switches the contact state with the fixed card after flipping relative to the fixed plate, wherein the fixed card comprises a pair of L-shaped elastic metal sheets, a rectangular contact metal sheet, and a first rectangular grinding sheet symmetrically arranged on both sides of the flip blade, wherein the L-shaped elastic metal sheet is fixedly connected to the fixed plate, the rectangular contact metal sheet and the first rectangular grinding sheet are respectively fixedly connected to a side of the L-shaped elastic metal sheet close to the flip blade, the first rectangular grinding sheet is located above the rectangular contact metal sheet, and the spacing between the first rectangular grinding sheets and the spacing between the rectangular metal contact sheets are less than the thickness of the flip blade; when the flip blade flips downward, the flip blade is first inserted between the first rectangular grinding sheets, and the first rectangular grinding sheet grinds the contact surface of the flip blade, and the flip blade passes downward through the first rectangular grinding sheet and then is inserted between the rectangular contact metal sheets, and the rectangular contact metal sheet contacts the polished contact surface of the flip blade.

[0008] In some embodiments of the above-mentioned electric cabinet safety knife switch for power operation and maintenance, a second rectangular polishing sheet is fixedly connected below the flip blade, the first rectangular polishing sheet and the second rectangular polishing sheet are made of the same material, and the thickness of the second rectangular polishing sheet is less than the distance between the rectangular contact metal sheets; when the flip blade flips downward, the second rectangular polishing sheet passes through the first rectangular polishing sheet and is inserted between the rectangular contact metal sheets, and at the same time the flip blade is inserted between the first rectangular polishing sheets, the first rectangular polishing sheet polishes the contact surface of the flip blade, and the second rectangular polishing sheet polishes the rectangular contact metal sheets, the flip blade passes downward through the first rectangular polishing sheet and is inserted between the rectangular contact metal sheets, and at the same time the second rectangular polishing sheet passes downward through the rectangular contact metal sheets, and the polished rectangular contact metal sheets contact the polished contact surfaces of the flip blades.

[0009] In some embodiments of the above-mentioned electric cabinet safety knife switch for power operation and maintenance, a first brush body fixedly connected to the L-shaped elastic metal sheet is provided between the first rectangular grinding sheet and the rectangular contact metal sheet, and first bristles are fixedly connected to a side of the first brush body close to the flip blade, and the spacing between the first bristles is smaller than the thickness of the second rectangular grinding sheet, and the first bristles are used to sweep the contact surface of the flip blade and the second rectangular grinding sheet.

[0010] In some embodiments of the above-mentioned electric cabinet safety knife switch for power operation and maintenance, a second brush body is fixedly connected between the flip blade and the second rectangular grinding sheet, and second bristles are fixedly connected to the two side surfaces of the second brush body respectively, and the spacing between the second bristles and the L-shaped elastic metal sheet is smaller than the thickness of the first rectangular grinding sheet, and the second bristles are used to sweep the first rectangular grinding sheet and the rectangular contact metal sheet.

[0011] In some embodiments of the above-mentioned electric cabinet safety knife switch for power operation and maintenance, two fixed blocks are fixedly connected to the flip blade, the lower end of the fixed block is located below the flip blade, and the second rectangular grinding sheet is located between the two fixed blocks and is fixedly connected to the two fixed blocks respectively.

[0012] In some embodiments of the above-mentioned electric cabinet safety knife switch for power operation and maintenance, first chamfers are respectively provided on the upper and lower sides of a side of the first rectangular grinding sheet close to the flip blade.

[0013] In some embodiments of the above-mentioned electric cabinet safety knife switch for power operation and maintenance, second chamfers are respectively provided on the upper and lower sides of a side of the rectangular contact metal sheet close to the flip blade.

[0014] In some embodiments of the above-mentioned electric cabinet safety knife switch for power operation and maintenance, third chamfers are respectively provided on both side edges of the bottom surface of the second rectangular grinding sheet.

[0015] In some embodiments of the above-mentioned electric cabinet safety knife switch for power operation and maintenance, the electric cabinet safety knife switch for power operation and maintenance also includes a cover body, the cover body opening faces downward and is fixedly connected to the upper surface of the fixed plate, the flip blade and the fixed card are located inside the cover body, the end of the flip blade is fixedly connected to an operating handle, the operating handle is located outside the cover body, the cover body is provided with an avoidance groove that passes through the cover body, and the flip blade is inserted into the avoidance groove during the flipping process.

[0016] In some embodiments of the above-mentioned electric cabinet safety knife switch for power operation and maintenance, the flip blade and the fixed card are arranged in pairs, and a partition plate is fixedly connected to the inner top surface of the cover body, and the partition plate divides the internal space of the cover body into two left and right cavities, and the two groups of fixed cards are respectively located in the two cavities.

[0017] Beneficial effects of the present invention:

[0018] When the switch state is flipped, the first rectangular grinding sheet can slide relative to the flip blade to grind the contact surface of the flip blade, remove the oxide layer and dirt on the contact surface of the flip blade, keep the contact surface of the flip blade smooth, and reduce the contact resistance of the contact surface of the flip blade; the second rectangular grinding sheet grinds the surface of the rectangular contact metal sheet, removes the oxide layer and dirt on the surface of the rectangular contact metal sheet, keeps the surface of the rectangular contact metal sheet smooth, and reduces the contact resistance when the rectangular contact metal sheet contacts the flip blade. This avoids the inability to effectively conduct electricity during contact due to the oxide layer and dirt, and avoids fusing or even fire due to the electrothermal effect after the contact resistance increases, thereby improving reliability and safety.

[0019] The first brush and the second brush can brush the first rectangular grinding sheet and the second rectangular grinding sheet after grinding during the state switching process to remove debris attached to the first rectangular grinding sheet and the second rectangular grinding sheet, so that the first rectangular grinding sheet and the second rectangular grinding sheet remain smooth, improve the grinding performance of the first rectangular grinding sheet and the second rectangular grinding sheet, and avoid secondary contamination of the rectangular contact metal sheet and the contact surface of the flip blade.

[0020] Each time the switch state is switched, the contact surface of the flip blade and the rectangular contact metal sheet can be polished once, and the first rectangular polishing sheet and the second rectangular polishing sheet can be brushed once. When the staff finds that there is poor contact between the flip blade and the rectangular contact metal sheet when switching to the flip blade, the flip blade can be flipped up and down several times to polish the contact surface of the flip blade and the rectangular contact metal sheet multiple times, which is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0022] Figure 1 It is a structural schematic diagram of a safety knife switch of an electric cabinet used for power operation and maintenance in an embodiment of the present application;

[0023] Figure 2 yes Figure 1 A schematic diagram of the structure of the electric cabinet safety knife switch used for power operation and maintenance after the cover is removed;

[0024] Figure 3 yes Figure 2 A schematic diagram of the structure of the electric cabinet safety knife switch used for power operation and maintenance when it is switched to the circuit-breaking state;

[0025] Figure 4 yes Figure 2 A top view of

[0026] Figure 5 is along Figure 4 Sectional view along line AA;

[0027] Figure 6 It is a schematic diagram of the structure in which a fixed card is connected to a flip blade in an embodiment of the present application;

[0028] Figure 7 It is a schematic diagram of the structure of the cover body in the embodiment of the present application.

[0029] Description of reference numerals:

[0030] 100, fixed plate; 102, flip blade; 104, fixed card; 106, L-shaped elastic metal sheet; 108, rectangular contact metal sheet; 110, first rectangular grinding sheet; 112, second rectangular grinding sheet; 114, first brush body; 116, first bristles; 118, second brush body; 120, second bristles; 122, fixed block; 124, first chamfer; 126, second chamfer; 128, third chamfer; 130, cover; 132, operating handle; 134, avoidance groove; 136, partition plate; 138, cavity. DETAILED DESCRIPTION

[0031] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same figure numbers in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings need not be drawn to scale unless otherwise specified. The special word "exemplary" here means "used as an example, embodiment or illustrative". Any embodiment described here as "exemplary" is not necessarily interpreted as being superior to or better than other embodiments. In addition, in order to better illustrate the present application, those skilled in the art should understand that numerous specific details are given in each embodiment below. Without certain specific details, the present application can also be implemented. In some embodiments, methods, means and elements well known to those skilled in the art are not described in detail to highlight the subject matter of the present application.

[0032] Combination Figures 1 to 6As shown, the embodiment of the present application provides an electric cabinet safety knife switch for power operation and maintenance, including a fixed plate 100, a flip blade 102, and a fixed card 104. One end of the flip blade 102 is rotatably connected to the upper surface of the fixed plate 100, and the fixed card 104 is fixedly connected to the upper surface of the fixed plate 100. After the flip blade 102 is flipped relative to the fixed plate 100, it switches the contact state with the fixed card 104. The fixed card 104 includes a pair of L-shaped elastic metal sheets 106, a rectangular contact metal sheet 108, and a first rectangular grinding sheet 110 that are symmetrically arranged on both sides of the flip blade 102. The L-shaped elastic metal sheet 106 is fixedly connected to the fixed plate 100, and the rectangular contact metal sheet 108 and the first rectangular grinding sheet 110 are fixedly connected to the fixed plate 100. The L-shaped grinding sheets 110 are respectively fixedly connected to a side of the L-shaped elastic metal sheet 106 close to the flip blade 102, the first rectangular grinding sheet 110 is located above the rectangular contact metal sheet 108, and the spacing between the first rectangular grinding sheets 110 and the spacing between the rectangular metal contact sheets are smaller than the thickness of the flip blade 102; when the flip blade 102 flips downward, the flip blade 102 is first inserted between the first rectangular grinding sheets 110, and the first rectangular grinding sheet 110 grinds the contact surface of the flip blade 102. The flip blade 102 passes downward through the first rectangular grinding sheet 110 and then is inserted between the rectangular contact metal sheets 108, and the rectangular contact metal sheets 108 contact the grinded contact surface of the flip blade 102.

[0033] After long-term use, the contact resistance of the flip blade 102 and the rectangular contact metal sheet 108 will increase due to oxidation, corrosion, and dirt. When the switch state is flipped, the first rectangular grinding sheet 110 can slide relative to the flip blade 102 to grind the contact surface of the flip blade 102, remove the oxide layer and dirt on the contact surface of the flip blade 102, keep the contact surface of the flip blade 102 smooth, and reduce the contact resistance of the contact surface of the flip blade 102. It avoids the inability to effectively conduct electricity during contact due to the oxide layer and dirt, and avoids fusing or even fire due to the electrothermal effect after the contact resistance increases, thereby improving reliability and safety.

[0034] In some exemplary implementations of the present embodiment, a second rectangular grinding sheet 112 is fixedly connected to the bottom of the flip blade 102, the first rectangular grinding sheet 110 and the second rectangular grinding sheet 112 are made of the same material, and the thickness of the second rectangular grinding sheet 112 is less than the distance between the rectangular contact metal sheets 108; when the flip blade 102 flips downward, the second rectangular grinding sheet 112 passes through the first rectangular grinding sheet 110 and is inserted between the rectangular contact metal sheets 108, and at the same time, the flip blade 102 is inserted between the first rectangular grinding sheet 110, the first rectangular grinding sheet 110 grinds the contact surface of the flip blade 102, and the second rectangular grinding sheet 112 grinds the rectangular contact metal sheets 108, the flip blade 102 passes downward through the first rectangular grinding sheet 110 and is inserted between the rectangular contact metal sheets 108, and at the same time, the second rectangular grinding sheet 112 passes downward through the rectangular contact metal sheets 108, and the polished rectangular contact metal sheets 108 are in contact with the polished contact surface of the flip blade 102.

[0035] When the switch state is flipped, the second rectangular grinding sheet 112 grinds the surface of the rectangular contact metal sheet 108 to remove the oxide layer and dirt on the surface of the rectangular contact metal sheet 108, so that the surface of the rectangular contact metal sheet 108 remains smooth and the contact resistance when the rectangular contact metal sheet 108 contacts the flip blade 102 is reduced.

[0036] Combination Figure 6 As shown, in some exemplary implementations of the present embodiment, a first brush body 114 fixedly connected to the L-shaped elastic metal sheet 106 is provided between the first rectangular grinding sheet 110 and the rectangular contact metal sheet 108, and first bristles 116 are fixedly connected to a side of the first brush body 114 close to the flip blade 102, and the spacing between the first bristles 116 is smaller than the thickness of the second rectangular grinding sheet 112, and the first bristles 116 are used to sweep the contact surface of the flip blade 102 and the second rectangular grinding sheet 112.

[0037] After the second rectangular grinding sheet 112 grinds the rectangular contact metal sheet 108, the oxide layer and dirt are grinded into debris, and some of the debris adheres to the surface of the second rectangular grinding sheet 112. If it is not removed, the grinding performance will be affected, and the debris may also adhere to the surface of the rectangular contact metal sheet 108 during the next grinding process. The first brush 116 sweeps the second rectangular grinding sheet 112 after grinding to remove the debris attached to the second rectangular grinding sheet 112, so that the second rectangular grinding sheet 112 remains smooth, improves the grinding performance of the second rectangular grinding sheet 112, and avoids secondary pollution to the rectangular contact metal sheet 108.

[0038] In some exemplary implementations of the present embodiment, a second brush body 118 is fixedly connected between the flip blade 102 and the second rectangular grinding sheet 112, and second bristles 120 are fixedly connected to the two side surfaces of the second brush body 118, and the spacing between the second bristles 120 and the L-shaped elastic metal sheet 106 is smaller than the thickness of the first rectangular grinding sheet 110, and the second bristles 120 are used to sweep the first rectangular grinding sheet 110 and the rectangular contact metal sheet 108.

[0039] After the first rectangular grinding sheet 110 grinds the contact surface of the flip blade 102, the oxide layer and dirt are ground into debris, and some of the debris adheres to the surface of the first rectangular grinding sheet 110. If it is not removed, it will affect the grinding performance, and the debris may also adhere to the contact surface of the flip blade 102 during the next grinding process. The second brush 120 sweeps the first rectangular grinding sheet 110 after grinding to remove the debris attached to the first rectangular grinding sheet 110, so that the first rectangular grinding sheet 110 remains smooth, improves the grinding performance of the first rectangular grinding sheet 110, and avoids secondary pollution to the contact surface of the flip blade 102.

[0040] In some exemplary implementations of this embodiment, two fixed blocks 122 are fixedly connected to the flip blade 102, the lower end of the fixed block 122 is located below the flip blade 102, and the second rectangular grinding sheet 112 is located between the two fixed blocks 122 and is fixedly connected to the two fixed blocks 122 respectively.

[0041] In some exemplary implementations of this embodiment, first chamfers 124 are respectively provided on the upper and lower sides of a surface of the first rectangular grinding sheet 110 close to the flip blade 102 .

[0042] The first chamfer 124 can prevent the flip blade 102 from interfering with the first rectangular grinding sheet 110 and getting stuck when passing through the first rectangular grinding sheet 110 .

[0043] In some exemplary implementations of this embodiment, the upper and lower sides of a surface of the rectangular contact metal sheet 108 close to the flip blade 102 are respectively provided with second chamfers 126 .

[0044] The second chamfer 126 can prevent the flip blade 102 from interfering with the rectangular contact metal sheet 108 and getting stuck when the flip blade 102 is inserted into the rectangular contact metal sheet 108 and when the second rectangular grinding sheet 112 passes through the rectangular contact metal sheet 108 .

[0045] In some exemplary implementations of this embodiment, third chamfers 128 are respectively provided on both sides of the bottom surface of the second rectangular grinding sheet 112 .

[0046] An active space is formed between the first chamfer 124 and the second chamfer 126 , and the first bristles 116 can deflect up and down in the active space during the brushing process to prevent the first bristles 116 from being pinched off.

[0047] Combination Figure 7 As shown, in some exemplary implementations of the present embodiment, the electric cabinet safety knife switch for power operation and maintenance also includes a cover body 130, the cover body 130 opening is downward and is fixedly connected to the upper surface of the fixed plate 100, the flip blade 102 and the fixed card 104 are located inside the cover body 130, the end of the flip blade 102 is fixedly connected with an operating handle 132, the operating handle 132 is located outside the cover body 130, and the cover body 130 is provided with an avoidance groove 134 that passes through the cover body 130, and the flip blade 102 is inserted into the avoidance groove 134 during the flipping process.

[0048] In some exemplary implementations of this embodiment, the flip blade 102 and the fixed card 104 are arranged in pairs, and a partition plate 136 is fixedly connected to the inner top surface of the cover body 130. The partition plate 136 divides the internal space of the cover body 130 into two left and right cavities 138, and the two groups of fixed cards 104 are respectively located inside the two cavities 138.

[0049] It should be noted that the "spacing, thickness" in this embodiment refers to the spacing distance or length of the designated components along the horizontal and vertical flipping directions of the blade 102. The "rectangular grinding sheet" in this embodiment is made of the same material as the whetstone (other grinding materials may also be used).

[0050] The knife switch in this embodiment can grind the contact surface of the flip blade 102 and the rectangular contact metal sheet 108 once, and brush the first rectangular grinding sheet 110 and the second rectangular grinding sheet 112 once each time the switch state is switched. When the staff finds that the flip blade 102 and the rectangular contact metal sheet 108 have poor contact, the flip blade 102 can be flipped up and down several times, and the contact surface of the flip blade 102 and the rectangular contact metal sheet 108 can be grinded multiple times, which is convenient to operate.

[0051] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A safety knife switch for an electric cabinet used for power operation and maintenance, comprising a fixed plate (100), a flip blade (102), and a fixed card (104), wherein one end of the flip blade (102) is rotatably connected to the upper surface of the fixed plate (100), the fixed card (104) is fixedly connected to the upper surface of the fixed plate (100), and the flip blade (102) switches the contact state with the fixed card (104) after flipping relative to the fixed plate (100), characterized in that: The fixed card (104) comprises a pair of L-shaped elastic metal sheets (106), a rectangular contact metal sheet (108), and a first rectangular grinding sheet (110) which are symmetrically arranged on both sides of the flip blade (102); the L-shaped elastic metal sheet (106) is fixedly connected to the fixed plate (100); the rectangular contact metal sheet (108) and the first rectangular grinding sheet (110) are respectively fixedly connected to a side of the L-shaped elastic metal sheet (106) close to the flip blade (102); the first rectangular grinding sheet (110) is located above the rectangular contact metal sheet (108); and the spacing between the first rectangular grinding sheets (110) and the spacing between the rectangular contact metal sheets are smaller than the thickness of the flip blade (102); When the flip blade (102) flips downward, the flip blade (102) is first inserted between the first rectangular grinding sheets (110), and the first rectangular grinding sheets (110) grind the contact surface of the flip blade (102). After the flip blade (102) passes downward through the first rectangular grinding sheets (110), it is inserted between the rectangular contact metal sheets (108), and the rectangular contact metal sheets (108) contact the grinded contact surface of the flip blade (102).

2. The electric cabinet safety knife switch for power operation and maintenance according to claim 1 is characterized in that: A second rectangular grinding sheet (112) is fixedly connected below the flip blade (102); the first rectangular grinding sheet (110) and the second rectangular grinding sheet (112) are made of the same material; and the thickness of the second rectangular grinding sheet (112) is smaller than the distance between the rectangular contact metal sheets (108); When the flip blade (102) flips downward, the second rectangular grinding sheet (112) passes through the first rectangular grinding sheet (110) and is inserted between the rectangular contact metal sheets (108). At the same time, the flip blade (102) is inserted between the first rectangular grinding sheets (110). The first rectangular grinding sheet (110) grinds the contact surface of the flip blade (102). The second rectangular grinding sheet (112) grinds the rectangular contact metal sheets (108). The flip blade (102) passes through the first rectangular grinding sheet (110) downward and is inserted between the rectangular contact metal sheets (108). At the same time, the second rectangular grinding sheet (112) passes through the rectangular contact metal sheets (108). The polished rectangular contact metal sheets (108) are in contact with the polished contact surface of the flip blade (102).

3. The electric cabinet safety knife switch for power operation and maintenance according to claim 2 is characterized in that: A first brush body (114) fixedly connected to the L-shaped elastic metal sheet (106) is provided between the first rectangular grinding sheet (110) and the rectangular contact metal sheet (108); a first brush bristle (116) is fixedly connected to a surface of the first brush body (114) close to the flip blade (102); the spacing between the first brush bristles (116) is smaller than the thickness of the second rectangular grinding sheet (112); the first brush bristles (116) are used to sweep the contact surface of the flip blade (102) and the second rectangular grinding sheet (112).

4. The electric cabinet safety knife switch for power operation and maintenance according to claim 2 is characterized in that: A second brush body (118) is fixedly connected between the flip blade (102) and the second rectangular grinding sheet (112); second bristles (120) are fixedly connected to two side surfaces of the second brush body (118); the spacing between the second bristles (120) and the L-shaped elastic metal sheet (106) is smaller than the thickness of the first rectangular grinding sheet (110); and the second bristles (120) are used to sweep the first rectangular grinding sheet (110) and the rectangular contact metal sheet (108).

5. The electric cabinet safety knife switch for electric power operation and maintenance according to claim 2 is characterized in that: Two fixed blocks (122) are fixedly connected to the flip blade (102), the lower end of the fixed block (122) is located below the flip blade (102), and the second rectangular grinding sheet (112) is located between the two fixed blocks (122) and is fixedly connected to the two fixed blocks (122) respectively.

6. The electric cabinet safety knife switch for electric power operation and maintenance according to claim 1 is characterized in that: The first rectangular grinding sheet (110) is provided with first chamfers (124) on the upper and lower sides of a surface close to the flip blade (102).

7. The electric cabinet safety knife switch for electric power operation and maintenance according to claim 1 is characterized in that: Second chamfers (126) are respectively provided on the upper and lower sides of a surface of the rectangular contact metal sheet (108) close to the flip blade (102).

8. The electric cabinet safety knife switch for electric power operation and maintenance according to claim 2 is characterized in that: The second rectangular grinding sheet (112) is provided with third chamfers (128) on both sides of the bottom surface.

9. The electric cabinet safety knife switch for electric power operation and maintenance according to claim 1, characterized in that: The electric cabinet safety knife switch for electric power operation and maintenance further comprises a cover body (130), the cover body (130) opening is downward and is fixedly connected to the upper surface of the fixed plate (100), the flip blade (102) and the fixed card (104) are located inside the cover body (130), the end of the flip blade (102) is fixedly connected to an operating handle (132), the operating handle (132) is located outside the cover body (130), the cover body (130) is provided with an avoidance groove (134) penetrating the cover body (130), and the flip blade (102) is inserted into the avoidance groove (134) during the flipping process.

10. The electric cabinet safety knife switch for electric power operation and maintenance according to claim 9, characterized in that: The flip blade (102) and the fixed card (104) are arranged in pairs, and a partition plate (136) is fixedly connected to the inner top surface of the cover body (130), and the partition plate (136) divides the internal space of the cover body (130) into two left and right cavities (138), and the two groups of the fixed cards (104) are respectively located inside the two cavities (138).

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