Fusing device and method for three-phase synchronous drop-out fuse

Abstract

The invention relates to the technical field of power switches, and discloses a fusing device and method for a three-phase synchronous drop-out fuse, and the device comprises a top housing, the lower surface of the top housing is fixedly connected with a resistor assembly, the bottom end of the resistor assembly is fixedly connected with a pedestal, and the exterior of the lower side of the resistor assembly is fixedly connected with a supporting housing. The outer portion of the supporting shell is fixedly connected with an insulating support, the inner portion of the supporting shell is rotatably connected with a fuse tube, the outer portion of the fuse tube is slidably connected with a sliding sleeve, the lower surface of the top shell is fixedly connected with an adjusting assembly, and the outer portion of the lower side of the adjusting assembly is rotatably connected with a sliding rod. A fixing assembly is arranged outside the top end of the resistor assembly, and a protection assembly is arranged at the rotating connection position of the fuse tube and the supporting shell. Through the mutual cooperation of the sliding sleeve, the sliding rod and the adjusting assembly, when the fuse tubes fall due to abnormal current, the action of a single fuse tube can be synchronously transmitted to other two phases of a three-phase system, and the reliability and stability of circuit protection are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power switches, and in particular to a three-phase synchronous drop-out fuse fusing device and method. Background Art

[0002] In the power distribution sector, drop-out fuses, as key overcurrent protection devices, are widely used for short-circuit and overload protection of distribution lines and power transformers at voltage levels of 10kV and below. For three-phase AC power supply systems, the three-phase synchronous operation of the fuse is a key indicator for ensuring stable system operation.

[0003] For three-phase power supply systems, the three-phase synchronous operation performance of the fuse directly affects the stability and reliability of the system. The drop-type fuses in the existing technology usually adopt a mechanism in which each phase is triggered independently. When the circuit is overloaded or short-circuited, the operation time of the fuse tubes of each phase often varies, making it difficult to achieve accurate three-phase synchronous drop.

[0004] The inventors of the present application have discovered during their research that the core defect of the above-mentioned prior art is that the asynchronous operation of the three-phase fuses will cause an imbalance in the three-phase current of the system, generate a negative sequence component, and further cause the motor to heat up. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a three-phase synchronous drop-out fuse fusing device and method, which solves the problem of unbalanced three-phase current in the system caused by asynchronous operation of the three-phase fuse.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a three-phase synchronous drop-out fuse device, comprising a top shell, the lower surface of the top shell is fixedly connected to a resistor assembly, the bottom end of the resistor assembly is fixedly connected to a base, the lower side of the resistor assembly is fixedly connected to a support shell, the outside of the support shell is fixedly connected to an insulating support, the inside of the support shell is rotatably connected to a fuse tube, the outside of the fuse tube is slidably connected to a sliding sleeve, a contact is fixed to the upper side of the fuse tube, the lower surface of the top shell is fixedly connected to an adjustment assembly, the lower side of the adjustment assembly is rotatably connected to a sliding rod, the outside of the sliding sleeve is rotatably connected to the outside of the sliding rod, a fixed assembly is provided on the top outside of the resistor assembly, and a protective assembly is provided at the rotational connection between the fuse tube and the support shell.

[0007] By adopting the above technical solution, through the mutual cooperation of the top shell, resistor assembly, support shell, fuse tube, sliding sleeve, and adjustment assembly components, when an overload or short circuit fault occurs in the circuit, the abnormal current flows through the fuse tube and the contact, causing the spring piece to deform due to heat, pushing the block in the fixed assembly to release the constraint on the fuse tube. When the fuse tube falls under the action of gravity, its external sliding sleeve drives the sliding rod to rotate, and the action is synchronously transmitted to the other two phases of the three-phase system through the rigid linkage structure of the adjustment assembly, ensuring that the three-phase fuse tubes fall synchronously to cut off the circuit. At the same time, the fall of the fuse tube triggers the protection assembly, and the protection shell covers the resistor connection point through the transmission of the rotating rod, gear, and rack, thereby isolating the arc from the external environment.

[0008] Preferably, the adjustment assembly includes a fixed shell 1, the top end of the fixed shell 1 is fixedly connected to the lower surface of the top shell, the interior of the fixed shell 1 is fixedly connected to a rotating column, the outside of the rotating column is provided with an adjustment rod, the lower side of the adjustment rod is rotatably connected to the outside of the sliding rod, and the upper side of the adjustment rod is fixedly connected to a grip rod.

[0009] Preferably, a first spring is slidably connected to the interior of the adjusting rod, a gasket is provided between the first spring and the adjusting rod, and an outer side of one side of the first spring contacts the outer side of the rotating column.

[0010] Preferably, the resistor assembly includes a resistor, the top end of the resistor is fixedly connected to the inside of the top shell, and a spring sheet is provided on the outer upper side of the resistor.

[0011] Preferably, the fixing assembly includes a second fixing shell, the interior of the second fixing shell is fixedly connected to the top exterior of the resistor, a connecting rod is slidably connected to the interior of the lower side of the second fixing shell, and a stopper 1 is fixedly connected to the top of the connecting rod.

[0012] Preferably, a second stopper is provided on the outside of the first stopper, and the second stopper is slidably connected to the inside of the second fixed shell via a second spring for squeezing the spring sheet, and the outside of the first stopper runs through a plurality of second springs.

[0013] Preferably, the protective assembly includes a rotating rod, one side of the rotating rod is externally rotatably connected to the inside of the support shell, the other side of the rotating rod is externally fixedly connected to a gear, the external side of the gear is externally rotatably connected to the inside of the insulating support, and the tooth end of the gear is meshed with a rack.

[0014] Preferably, the outside of the rack is slidably connected to the inside of the insulating support, one side of the rack is fixedly connected to the outside of a connecting plate, and one side of the connecting plate is fixedly connected to the outside of a protective shell.

[0015] Preferably, the protective shell covers the connection points of the resistor to prevent external foreign matter from entering.

[0016] Preferably, a method for using a three-phase synchronous drop-out fuse device comprises the following steps:

[0017] S1. When an overload or short-circuit fault occurs in the circuit, abnormal current flows through the fuse tube and the contact. The contact heats up and causes the spring piece to deform due to heat, pushing the second block in the fixed assembly to compress the second spring. The second block further pushes the first block. The inverted cone structure of the first block applies extrusion force to the fuse tube, releasing the fuse tube's fixed constraint on the resistor assembly.

[0018] S2. The fuse tube begins to fall under the action of gravity. The external sliding sleeve slides along the fuse tube and drives the sliding rod to rotate. The rotation of the sliding rod is synchronously transmitted to the other two-phase fuse devices of the three-phase system through the adjustment component, ensuring that the three-phase fuse tubes fall at the same time and cut off the circuit.

[0019] S3. During the falling process of the fuse tube, the rotating connection between it and the support shell triggers the protective component; the rotating rod rotates with the fuse tube, driving the gear to rotate; the gear engages the rack to make it slide along the insulating support, and the rack pushes the protective shell through the connecting plate to cover the wiring of the resistor, isolating the arc from the external environment and avoiding the risk of arc burns or short circuits.

[0020] S4. When resetting is required, the operator pushes the handle to apply external force, causing the adjustment rod to move in a circle around the rotating column. The adjustment rod pushes the slide rod to move in an arc, driving the sliding sleeve to slide along the fuse tube. During the sliding process of the sliding sleeve, the fuse tube and the contact are reset to the inside of the spring sheet, restoring the electrical connection.

[0021] By adopting the above technical solution, when an overload or short circuit occurs in the circuit, abnormal current flows through the fuse tube and the contact, the contact heats up and causes the spring piece to deform due to heat, pushing the second stopper in the fixed component to compress the second spring and drive the first stopper, and utilizing the inverted cone structure to release the fixed constraint of the fuse tube on the resistor component. When the fuse tube falls under the action of gravity, the external sliding sleeve slides along it and drives the sliding rod to rotate, and the action is synchronously transmitted to the other two phases of the three-phase system through the adjustment component, ensuring that the three-phase fuse tubes fall at the same time to cut off the circuit, thereby solving the system failure caused by the asynchronous three-phase action of the traditional fuse. At the same time, the falling of the fuse tube triggers the protection component, the rotating rod drives the gear to rotate and engage the rack, pushing the protective shell to cover the resistor connection point, isolating the arc from the external environment, and avoiding the risk of arc burns or short circuit; when resetting, the operator pushes the grip to make the adjustment rod rotate around the rotating column, and the sliding rod drives the sliding sleeve to reset the fuse tube and contact to the spring leaf, which simplifies the reset process and improves the convenience of maintenance. This solution realizes three-phase synchronous action through mechanical linkage, does not require additional detection circuit, responds quickly and has high reliability. The protection design effectively improves the safety and durability of the equipment.

[0022] The present invention provides a three-phase synchronous drop-out fuse fusing device and method, which has the following beneficial effects:

[0023] 1. Through the interaction of the sliding sleeve, the sliding rod, and the adjustment assembly, the present invention can synchronously transmit the action of a single fuse to the other two phases of the three-phase system when the fuse drops due to abnormal current, ensuring that the three-phase fuses drop simultaneously to cut off the circuit. This effectively solves the system imbalance problem caused by the asynchronous three-phase action of traditional fuses and improves the reliability and stability of circuit protection.

[0024] 2. The present invention uses a protective assembly consisting of a rotating rod, a gear, a rack and a protective shell. When the fuse tube falls, the protective assembly is triggered and the protective shell can automatically cover the resistor connection point, which can not only isolate the arc from the external environment, preventing the arc from burning surrounding components or causing a short circuit, but also block external foreign matter such as dust and rain from entering the connection area, preventing the degradation of insulation performance due to the accumulation of foreign matter, thereby improving the safety and durability of the device.

[0025] 3. When resetting, the present invention allows the operator to push the handle to drive the adjustment rod to rotate around the rotating column, and reset the fuse tube and contact to the spring sheet through the sliding rod and the sliding sleeve. This eliminates the need for complicated operating steps, simplifies the resetting process, reduces maintenance difficulty, and improves the convenience and efficiency of equipment maintenance.

[0026] 4. The present invention utilizes the physical property of the spring sheet being deformed by heat. When the circuit is overloaded or short-circuited, the contact heats up and causes the spring sheet to deform, pushing the fixing assembly to release the constraint on the fuse tube. No additional detection circuit is required, achieving a rapid response to the circuit status and improving the accuracy and reliability of circuit protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the local structure of the insulating support of the present invention;

[0029] Figure 3 It is a schematic diagram of the local structure of the fuse tube of the present invention;

[0030] Figure 4 It is a schematic diagram of the local structure of the regulating component of the present invention;

[0031] Figure 5 It is a schematic diagram of the partial structure of the first spring of the present invention;

[0032] Figure 6 It is a schematic diagram of the local structure of the spring sheet of the present invention;

[0033] Figure 7 This is a schematic diagram of the partial structure of the stopper 2 of the present invention;

[0034] Figure 8 It is a schematic diagram of the partial structure of the protective shell of the present invention.

[0035] Among them, 1. top shell; 2. resistor assembly; 21. resistor; 22. spring sheet; 3. base; 4. support shell; 5. insulating support; 6. fuse tube; 7. sliding sleeve; 8. contact; 9. sliding rod; 10. adjustment assembly; 101. fixed shell 1; 102. rotating column; 103. adjusting rod; 104. gasket; 105. first spring; 106. grip rod; 11. fixed assembly; 111. fixed shell 2; 112. connecting rod; 113. block 1; 114. block 2; 115. second spring; 12. protective assembly; 121. rotating rod; 122. gear; 123. rack; 124. connecting plate; 125. protective shell. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Please see the attached Figure 1 -Attached Figure 3 An embodiment of the present invention provides a three-phase synchronous drop-out fuse device, including a top shell 1, a resistor component 2 is fixedly connected to the lower surface of the top shell 1, the bottom end of the resistor component 2 is fixedly connected to a base 3, the lower side of the resistor component 2 is fixedly connected to a support shell 4, the outside of the support shell 4 is fixedly connected to an insulating support 5, the inside of the support shell 4 is rotatably connected to a fuse tube 6, the outside of the fuse tube 6 is slidably connected to a sliding sleeve 7, and a contact 8 is fixed to the upper side of the fuse tube 6. The lower surface of the top shell 1 is fixedly connected to an adjustment component 10, the lower side of the adjustment component 10 is rotatably connected to a slide rod 9, the outside of the sliding sleeve 7 is rotatably connected to the outside of the slide rod 9, a fixing component 11 is provided on the top outside of the resistor component 2, and a protective component 12 is provided at the rotation connection between the fuse tube 6 and the support shell 4.

[0038] Specifically, when an overload or short circuit occurs in the circuit, an abnormal current flows through the fuse tube 6 and the contact 8. The contact 8 heats up, causing the spring piece 22 to deform due to heat, pushing the second stopper 114 in the fixing assembly 11 to compress the second spring 115, and then releasing the constraint on the fuse tube 6 through the inverted cone-shaped stopper 113, causing it to fall due to gravity. At this time, the sliding sleeve 7 slides along the fuse tube 6 and drives the slide rod 9 to rotate. The adjustment assembly 10 synchronously transmits the action of the single fuse tube 6 to the other two phases of the three-phase system, ensuring that the three-phase fuse tubes 6 fall and cut off the circuit at the same time, solving the system imbalance problem caused by the asynchronous three-phase action of traditional fuses. During the falling process of the fuse tube 6, the rotating rod 121 drives the gear 122 to drive the rack 123, so that the protective shell 125 covers the connection point of the resistor 21, isolating the arc from the external environment, and avoiding the risk of short circuit caused by arc burns or foreign objects in the traditional device. During reset, the operator pushes the handle 106 to drive the adjustment rod 103 to rotate around the rotating column 102, and resets the fuse tube 6 to the spring piece 22 through the slide rod 9 and the sliding sleeve 7, restoring the electrical connection, solving the problem of complex reset operation of traditional devices.

[0039] Please see the attached Figure 4 and attached Figure 5 The adjustment component 10 includes a fixed shell 101, the top of the fixed shell 101 is fixedly connected to the lower surface of the top shell 1, the interior of the fixed shell 101 is fixedly connected to a rotating column 102, the outside of the rotating column 102 is provided with an adjusting rod 103, the lower outside of the adjusting rod 103 is rotatably connected to the outside of the sliding rod 9, and the upper outside of the adjusting rod 103 is fixedly connected to a grip rod 106; the inside of the adjusting rod 103 is slidably connected to a first spring 105, a gasket 104 is provided between the first spring 105 and the adjusting rod 103, and one side of the first spring 105 contacts the outside of the rotating column 102.

[0040] Specifically, when resetting is required, the operator applies external force by pushing the grip rod 106. Since the grip rod 106 is fixedly connected to the adjusting rod 103, the adjusting rod 103 will make a circular motion around the rotating column 102. When the adjusting rod 103 rotates, it will squeeze the first spring 105 and the gasket 104, and limit the excessive rotation of the adjusting rod 103. The lower side of the adjusting rod 103 is rotatably connected to the slide rod 9, and the circular motion of the adjusting rod 103 is converted into an arc motion of the slide rod 9, thereby pushing the sliding sleeve 7 to slide along the fuse tube 6. When the sliding sleeve 7 slides, it will drive the fuse tube 6 and the contact 8 to be fixed inside the spring sheet 22, thereby realizing the resetting of the contact 8 and the circuit.

[0041] Please see the attached Figure 6 and attached Figure 7The resistor assembly 2 includes a resistor 21, the top of which is fixedly connected to the inside of the top shell 1, and a spring sheet 22 is provided on the outer upper side of the resistor 21; the fixed assembly 11 includes a fixed shell 2 111, the inside of the fixed shell 2 111 is fixedly connected to the outside of the top of the resistor 21, a connecting rod 112 is slidably connected to the inside of the lower side of the fixed shell 2 111, and a stopper 113 is fixedly connected to the top of the connecting rod 112; a stopper 114 is provided on the outside of the stopper 113, and the stopper 114 is slidably connected to the inside of the fixed shell 2 111 through a second spring 115 for squeezing the spring sheet 22, and the outside of the stopper 113 passes through multiple second springs 115.

[0042] Specifically, when the circuit is operating normally, the second block 114 of the fixing assembly 11 applies a continuous squeezing force to the contact 8 under the action of the second spring 115, so that the spring piece 22 fits tightly against the outside of the contact 8, ensuring that the electrical connection between the resistor 21 and the fuse tube 6 is stable and reliable.

[0043] When an overload or short circuit occurs in the circuit, resulting in an abnormally high current, the temperature of resistor 21 rises due to the excessive current, and the heat is transferred to spring piece 22. Spring piece 22 deforms upon heating, generating an outward expansion force. Spring piece 22 pushes stopper 2 114 to overcome the elastic force of second spring 115 and slide toward the interior of fixed housing 2 111. Simultaneously, the movement of stopper 2 114 squeezes stopper 1 113. Driven by connecting rod 112, stopper 1 113 slides downward and squeezes fuse tube 6, separating fuse tube 6 and contact 8 from spring piece 22. This eliminates the need for additional detection circuitry and utilizes the physical properties of the material itself to achieve a rapid response to circuit status, effectively avoiding electrical faults caused by poor contact or delayed response, and improving the accuracy and reliability of circuit protection.

[0044] Please see the attached Figure 7 and attached Figure 8 The protective component 12 includes a rotating rod 121, one side of the rotating rod 121 is externally rotatably connected to the inside of the support shell 4, and the other side of the rotating rod 121 is externally fixedly connected to a gear 122, the external gear 122 is externally rotatably connected to the inside of the insulating support 5, and the tooth end of the gear 122 is meshed and connected to a rack 123; the external portion of the rack 123 is slidably connected to the inside of the insulating support 5, one side of the rack 123 is externally fixedly connected to a connecting plate 124, and one side of the connecting plate 124 is externally fixedly connected to a protective shell 125; the protective shell 125 covers the wiring of the resistor 21 to prevent external foreign matter from entering.

[0045] Specifically, when the fuse tube 6 falls and rotates due to a circuit fault, the rotating rod 121 rotatably connected to the support shell 4 rotates synchronously, driving the gear 122 at the other end thereof to rotate in the insulating support 5. The rotation of the gear 122 drives the rack 123 to slide linearly along the slideway of the insulating support 5 through the engagement of the tooth ends. The rack 123 pushes the protective shell 125 toward the wiring point of the resistor 21 through the connecting plate 124 and covers the wiring area, thereby preventing the arc from burning surrounding components or causing a short circuit, and blocking external foreign matter such as dust and rain from entering the wiring area, thereby preventing the insulation performance from being degraded due to the accumulation of foreign matter.

[0046] A method for using a three-phase synchronous drop-out fuse device comprises the following steps:

[0047] S1. When an overload or short-circuit fault occurs in the circuit, an abnormal current flows through the fuse tube 6 and the contact 8. The contact 8 heats up, causing the spring piece 22 to deform due to heat, pushing the second stopper 114 in the fixing assembly 11 to compress the second spring 115. The second stopper 114 further pushes the first stopper 113. The inverted cone structure of the first stopper 113 applies an extrusion force to the fuse tube 6, thereby releasing the fixing constraint of the fuse tube 6 on the resistor assembly 2.

[0048] S2. The fuse tube 6 begins to fall under the action of gravity. The sliding sleeve 7 on its outside slides along the fuse tube 6 and drives the slide rod 9 to rotate. The rotation of the slide rod 9 is synchronously transmitted to the other two-phase fuse devices of the three-phase system through the adjustment component 10, ensuring that the three-phase fuse tubes 6 fall at the same time and cut off the circuit.

[0049] S3. During the falling process of the fuse tube 6, the rotating connection between it and the support shell 4 triggers the protective component 12; the rotating rod 121 rotates with the fuse tube 6, driving the gear 122 to rotate; the gear 122 engages the rack 123 to make it slide along the insulating support 5, and the rack 123 pushes the protective shell 125 through the connecting plate 124 to cover the connection point of the resistor 21, isolating the arc from the external environment, and avoiding the risk of arc burns or short circuit.

[0050] S4. When resetting is required, the operator pushes the gripping rod 106 to apply external force, causing the adjusting rod 103 to make a circular motion around the rotating column 102. The adjusting rod 103 pushes the sliding rod 9 to make an arc motion, driving the sliding sleeve 7 to slide along the fuse tube 6. During the sliding process of the sliding sleeve 7, the fuse tube 6 and the contact 8 are reset to the inside of the spring piece 22, thereby restoring the electrical connection.

[0051] Specifically, when the circuit is overloaded or short-circuited, the abnormal current flows through the fuse tube 6 and the contact 8. The contact 8 heats up and causes the spring piece 22 to deform due to heat, pushing the second block 114 in the fixed component 11 to compress the second spring 115. The second block 114 will push the first block 113. The lower half of the first block 113 is an inverted cone. The first block 113 will squeeze the fuse tube 6, and the first block 113 releases the fixed constraint of the fuse tube 6 on the resistor component 2. At this time, the fuse tube 6 begins to fall under the action of gravity, and the sliding sleeve 7 on its outside slides along the outside of the fuse tube 6 and rotates on the outside of the sliding rod 9 until the sliding sleeve 7 slides to the top of the fuse tube 6. During the sliding process, the sliding sleeve 7 drives the sliding rod 9 to rotate around the inside of the support shell 4. At the same time, the adjusting rod 103 rotates around the rotating column 102, and the sliding sleeve 7 disengages and drives the sliding rod 9 to rotate, so that the action of the single fuse tube 6 is synchronously transmitted to the other two-phase fuse devices of the three-phase system, ensuring that the three-phase fuse tubes 6 fall at the same time and cut off the circuit. During the falling process of the fuse tube 6, the rotating connection between it and the supporting shell 4 triggers the protective component 12, and the rotating rod 121 rotates with the rotation of the fuse tube 6, driving the gear 122 to rotate. The gear 122 engages the rack 123 to make it slide along the insulating support 5, and the rack 123 pushes the protective shell 125 through the connecting plate 124 to cover the wiring point at the lower end of the resistor 21, isolating the arc from the external environment and avoiding the risk of arc burns or short circuit.

[0052] When resetting is required, the operator pushes the grip 106 to drive the adjustment rod 103 to rotate around the rotating column 102, and resets the fuse tube 6 to the spring sheet 22 through the sliding rod 9 and the sliding sleeve 7. During this process, the top of the sliding sleeve 7 will squeeze the connecting rod 112, and the squeezing of the connecting rod 112 will push the second block 114 to stretch the second spring 115, and at the same time squeeze the spring sheet 22, so that the spring sheet 22 can stably fix the fuse tube 6 and the contact 8, and finally achieve the effect of restoring the electrical connection.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A three-phase synchronous drop-out fuse device, comprising a top shell (1), characterized in that: The lower surface of the top shell (1) is fixedly connected to a resistor assembly (2), the bottom end of the resistor assembly (2) is fixedly connected to a base (3), the lower side of the resistor assembly (2) is fixedly connected to a support shell (4), the outside of the support shell (4) is fixedly connected to an insulating support (5), the inside of the support shell (4) is rotatably connected to a fuse tube (6), the outside of the fuse tube (6) is slidably connected to a sliding sleeve (7), a contact (8) is fixedly attached to the upper side of the fuse tube (6), the lower surface of the top shell (1) is fixedly connected to an adjustment assembly (10), the lower side of the adjustment assembly (10) is rotatably connected to a sliding rod (9), the outside of the sliding sleeve (7) is rotatably connected to the outside of the sliding rod (9), a fixing assembly (11) is provided on the top outside of the resistor assembly (2), and a protective assembly (12) is provided at the rotational connection between the fuse tube (6) and the support shell (4).

2. A three-phase synchronous drop-out fuse device according to claim 1, characterized in that: The adjustment assembly (10) includes a fixed shell (101), the top end of the fixed shell (101) is fixedly connected to the lower surface of the top shell (1), the interior of the fixed shell (101) is fixedly connected to a rotating column (102), the exterior of the rotating column (102) is provided with an adjustment rod (103), the lower exterior of the adjustment rod (103) is rotatably connected to the exterior of the sliding rod (9), and the upper exterior of the adjustment rod (103) is fixedly connected to a grip rod (106).

3. A three-phase synchronous drop-out fuse device according to claim 2, characterized in that: The adjusting rod (103) is internally slidably connected to a first spring (105), a gasket (104) is provided between the first spring (105) and the adjusting rod (103), and one side of the first spring (105) contacts the outside of the rotating column (102).

4. A three-phase synchronous drop-out fuse device according to claim 1, characterized in that: The resistor assembly (2) comprises a resistor (21), the top end of the resistor (21) is fixedly connected to the inside of the top shell (1), and a spring sheet (22) is provided on the outside of the upper side of the resistor (21).

5. A three-phase synchronous drop-out fuse device according to claim 4, characterized in that: The fixing assembly (11) comprises a second fixing shell (111), the interior of the second fixing shell (111) being fixedly connected to the outside of the top end of the resistor (21), a connecting rod (112) being slidably connected to the interior of the lower side of the second fixing shell (111), and a stopper (113) being fixedly connected to the top end of the connecting rod (112).

6. A three-phase synchronous drop-out fuse device according to claim 5, characterized in that: A second stopper (114) is provided on the outside of the first stopper (113). The second stopper (114) is slidably connected to the inside of the second fixed shell (111) via a second spring (115) and is used to squeeze the spring sheet (22). The outside of the first stopper (113) passes through a plurality of second springs (115).

7. A three-phase synchronous drop-out fuse device according to claim 1, characterized in that: The protection assembly (12) comprises a rotating rod (121), one side of the rotating rod (121) is externally rotatably connected to the inside of the support shell (4), the other side of the rotating rod (121) is externally fixedly connected to a gear (122), the gear (122) is externally rotatably connected to the inside of the insulating support (5), and the tooth end of the gear (122) is meshedly connected to a rack (123).

8. A three-phase synchronous drop-out fuse device according to claim 7, characterized in that: The outside of the rack (123) is slidably connected to the inside of the insulating support (5), one side of the outside of the rack (123) is fixedly connected to a connecting plate (124), and one side of the outside of the connecting plate (124) is fixedly connected to a protective shell (125).

9. A three-phase synchronous drop-out fuse device according to claim 8, characterized in that: The protective shell (125) covers the connection point of the resistor (21) to prevent external foreign matter from entering.

10. A method for using a three-phase synchronous drop-out fuse device, characterized in that: A three-phase synchronous drop-out fuse device according to any one of claims 1 to 9 comprises the following steps: S1. When an overload or short circuit occurs in the circuit, an abnormal current flows through the fuse tube (6) and the contact (8). The contact (8) heats up, causing the spring sheet (22) to deform due to heat, pushing the second block (114) in the fixed component (11) to compress the second spring (115). The second block (114) further pushes the first block (113). The inverted cone structure of the first block (113) applies an extrusion force to the fuse tube (6), thereby releasing the fixing constraint of the fuse tube (6) on the resistor component (2).

11. S2. The fuse tube (6) begins to fall under the action of gravity. The outer sleeve (7) slides along the fuse tube (6) and drives the slide rod (9) to rotate. The rotation of the slide rod (9) is synchronously transmitted to the other two-phase fuse devices of the three-phase system through the adjustment component (10), ensuring that the three-phase fuse tubes (6) fall at the same time and cut off the circuit. 12.S3. During the falling process of the fuse tube (6), the rotating connection between it and the support shell (4) triggers the protective component (12), and the rotating rod (121) rotates with the fuse tube (6), driving the gear (122) to rotate; the gear (122) engages the rack (123) so that it slides along the insulating support (5), and the rack (123) pushes the protective shell (125) through the connecting plate (124) to cover the connection point of the resistor (21), isolating the arc from the external environment and avoiding the risk of arc burns or short circuits. 13.S4. When resetting is required, the operator pushes the grip (106) to apply external force, causing the adjusting rod (103) to move in a circular motion around the rotating column (102). The adjusting rod (103) pushes the sliding rod (9) to move in an arc, driving the sliding sleeve (7) to slide along the fuse tube (6). During the sliding process of the sliding sleeve (7), the fuse tube (6) and the contact (8) are reset to the inside of the spring sheet (22), thereby restoring the electrical connection.

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