Fuse fusing indicating device and mutual inductor handcart

Abstract

The invention provides a fuse fusing indicating device and a mutual inductor handcart, and belongs to the technical field of switch cabinets. The fuse fusing indicating device comprises an insulating swing rod, and the insulating swing rod comprises a rotating part which is used for being installed in a hinged mode relative to a handcart body of a mutual inductor handcart, so that the insulating swing rod can integrally swing relative to the handcart body of the mutual inductor handcart. The insulating swing rod further comprises a force transmission part used for being matched with a firing pin of the fuse in a force transmission mode and a jacking part used for being matched with the trigger end of the microswitch in a jacking mode, and the force transmission part is located between the rotating part and the jacking part. The mutual inductor handcart comprises a handcart body, a mutual inductor, a fuse and a microswitch, wherein the mutual inductor, the fuse and the microswitch are arranged on the handcart body, and the fuse fusing indicating device is further arranged on the handcart body. The insulation swing rod can play a role of a lever, the displacement of a firing pin of the fuse is amplified, and it is guaranteed that the insulation swing rod can stably abut against the trigger end of the microswitch.

Description

Technical Field

[0001] The invention belongs to the technical field of switch cabinets, and in particular relates to a blown fuse indicator device and a transformer trolley. Background Art

[0002] The switchgear used in nuclear power plants is required to have high safety, high reliability and stability. Its matching voltage transformer trolley with fuse can provide power to the secondary device, and the trolley structure can isolate the main busbar on the high-voltage side, thereby ensuring the safety of the staff during maintenance.

[0003] For common voltage transformer trolley structures, see the attached Figure 1 The voltage transformer trolley is provided with a current transformer 3 and a fuse 4, and the fuse 4 is used to protect the voltage transformer 3 from large current shock. Generally, the basis for judging the fuse failure is that the secondary device at the lower end of the voltage transformer loses power. This judgment cannot be accurate and direct, and is prone to misjudgment, which does not meet the design requirements of safety and reliability of nuclear power plant equipment.

[0004] The existing Chinese utility model patent with authorization announcement number CN208078498U and authorization announcement date November 9, 2018 discloses a voltage transformer trolley, which includes a chassis, a main frame, a voltage transformer, an insulating contact arm sleeve, a fuse, a fuse holding rod, a fuse blowing guide plate and a micro switch; the insulating contact arm sleeve is installed on the top of the voltage transformer, the fuse is installed in the insulating contact arm sleeve, and a striker is provided at one end of the fuse; the micro switch is installed on the micro switch mounting plate, and when the fuse of the fuse blows, the striker pops out and hits the fuse holding rod installed on the fuse, and the micro switch is triggered by the fuse holding rod to send a signal of fuse action or linkage contactor.

[0005] The above technical solution uses the fuse holding push rod to transmit, so that the micro switch is triggered after the fuse of the fuse is blown. However, the fuse holding push rod, the fuse and the trigger end of the micro switch are arranged on the same straight line, and the displacement of the fuse holding push rod will not exceed the stroke of the fuse striker. In addition, since the fuse holding push rod is subjected to the pre-tightening force of the spring, the displacement of the fuse holding push rod will be further limited, and it is difficult for the fuse holding push rod to trigger the micro switch, which may easily cause the micro switch to fail to be triggered after the fuse is blown.

[0006] In addition, the above-mentioned trolley will be longer and larger in size, resulting in reduced flexibility. When in use, it is also necessary to ensure sufficient insulation distance and creepage distance between the fuse and the trolley body and other components, otherwise there will be a high safety risk. Summary of the invention

[0007] One of the purposes of the present invention is to provide a blown fuse indication device to solve the technical problem in the prior art that the fuse clamping push rod has a small stroke and is difficult to trigger a micro switch because the fuse clamping push rod and the fuse are located on the same straight line.

[0008] Another object of the present invention is to provide a transformer trolley to solve the above technical problems.

[0009] To achieve the above object, the technical solution of the blown fuse indicator device provided by the present invention is:

[0010] A blown fuse indication device comprises an insulating swing arm, wherein the insulating swing arm comprises a rotating part hingedly mounted relative to a body of a transformer trolley so that the insulating swing arm can swing as a whole relative to the body of the transformer trolley, the insulating swing arm further comprises a force transmission part for cooperating with a striker of the fuse and a pressing part for cooperating with a trigger end of a micro switch, and the force transmission part is located between the rotating part and the pressing part.

[0011] The beneficial effect is that the above technical solution is a pioneering invention. When in use, the fuse blown indication device is installed on a transformer trolley. After the fuse blows, the striker pops out from the fuse and strikes the force transmission part of the insulating swing arm. The insulating swing arm swings due to the strike, and uses the pressing part to press the trigger end of the micro switch, so that the micro switch is triggered to send a signal. In the above technical solution, the insulating swing arm can act as a lever. The displacement of the pressing part during the swinging process of the insulating swing arm is greater than the displacement of the force transmission part. Therefore, the striker of the fuse only needs a small displacement to drive the pressing part of the insulating swing arm to make a large displacement, ensuring that the insulating swing arm can stably press the trigger end of the micro switch, thereby improving the reliability of the fuse blown indication device.

[0012] As a further improvement, the fuse blown indication device also includes a limit hinge support fixed on the body of the transformer trolley, the limit hinge support is located at the end of the insulating rocker arm away from the rotating part, and the limit hinge support is provided with a limit structure for limiting the swing angle of the insulating rocker arm.

[0013] The beneficial effect is that the limiting twisted support can limit the swing angle of the insulating swing arm, which can effectively improve the stability of the insulating swing arm.

[0014] As a further improvement, the limiting structure includes an arc-shaped long hole opened on the limiting hinge support, the center of the circle where the arc-shaped long hole is located is concentric with the rotation center of the rotating part, and the corresponding end of the insulating rocker arm is fixed with a pin shaft, and the pin shaft is passed through the arc-shaped long hole.

[0015] The beneficial effect is that the pin shaft is located in the arc-shaped long hole and is limited by the arc-shaped long hole, so that the pin shaft can only reciprocate along the arc-shaped long hole, thereby limiting the swing amplitude of the insulating rocker.

[0016] As a further improvement, the blown fuse indicating device further comprises a fixed hinge support for being fixed on the body of the transformer trolley, and the insulating swing arm is hinged on the fixed hinge support.

[0017] The beneficial effect is that the fixed twisted support is used to be installed on the body of the transformer trolley, so that the insulating swing arm can swing relative to the body, and the modularization degree of the fuse blown indication device is improved, which is convenient for assemblers to perform installation operations.

[0018] As a further improvement, the force transmission part is located in the middle of the line connecting the rotating part and the pressing part on the insulating rocker.

[0019] The beneficial effects are: on the one hand, due to the lever effect of the insulating swing rod, the insulating swing rod amplifies the displacement of the force transmission part at the top pressure part, while also reducing the force of the trigger end of the micro switch of the top pressure part. The force transmission part is arranged in the middle of the insulating swing rod to balance the above-mentioned influences, ensuring that the top pressure part has sufficient top pressure while having a larger displacement. On the other hand, arranging the force transmission part in the middle of the insulating swing rod can also balance the distance from the force transmission part to the rotating part and from the force transmission part to the top pressure part, so that the distance from the force transmission part to the rotating part and from the force transmission part to the top pressure part meets the requirements of the safe creepage distance.

[0020] As a further improvement, the pressing portion is located at an end of the insulating rocker arm away from the rotating portion.

[0021] The beneficial effect is that the above technical solution can maximize the utilization of the leverage effect of the insulating rocker rod.

[0022] As a further improvement, the insulating rocker arm is a slat-shaped structure, a push block for cooperating with a striker of the fuse is fixedly provided on the insulating rocker arm, and the force transmission part includes the push block.

[0023] The beneficial effect is that the insulating swing rod is set as a slat-shaped structure, which can effectively reduce the weight of the insulating swing rod and save the material of the supporting insulating swing rod. The above technical solution can reduce the weight of the insulating swing rod by setting a push block, and can also ensure a larger impact area for the striker, ensuring that the striker can stably contact the insulating swing rod and push the insulating swing rod.

[0024] As a further improvement, the insulating rocker arm includes a main rod body and an auxiliary push rod body perpendicular to the main rod body, the push block is connected to the end of the auxiliary push rod body, and the force transmission part also includes the auxiliary push rod body.

[0025] The beneficial effects are: on the one hand, due to the structural limitations of the existing fuse, the end of the fuse pin cannot directly contact the main rod body, so an auxiliary push rod body extending laterally from the main rod body is required for transmission. On the other hand, the auxiliary push rod body can further increase the creepage distance and enhance the insulation capacity of the insulating swing rod.

[0026] As a further improvement, the insulating rocker arm includes a main rod body and an auxiliary push rod body perpendicular to the main rod body, and the force transmission part includes the auxiliary push rod body.

[0027] The beneficial effects are: on the one hand, due to the structural limitations of the existing fuse, the end of the fuse pin cannot directly contact the main rod body, so an auxiliary push rod body extending laterally from the main rod body is required for transmission. On the other hand, the auxiliary push rod body can further increase the creepage distance and enhance the insulation capacity of the insulating swing rod.

[0028] To achieve the above purpose, the technical solution of the transformer trolley provided by the present invention is:

[0029] A transformer trolley comprises a trolley body and a transformer, a fuse and a micro switch arranged on the trolley body. A fuse blown indication device is also arranged on the trolley body. The fuse blown indication device comprises an insulating swing arm. The insulating swing arm comprises a rotating part for being hingedly mounted relative to the body of the transformer trolley so that the insulating swing arm can swing as a whole relative to the body of the transformer trolley. The insulating swing arm also comprises a force transmission part for force transmission cooperation with a striker of the fuse and a pressing part for pressing cooperation with a trigger end of the micro switch. The force transmission part is located between the rotating part and the pressing part.

[0030] The beneficial effect is that the above technical scheme is a further improvement of the prior art. After the fuse is blown, the striker pops out from the fuse and hits the force transmission part of the insulating swing rod. The insulating swing rod is hit and swings, and the pressing part presses the trigger end of the micro switch, so that the micro switch is triggered and sends a signal. In the above technical scheme, the insulating swing rod can play the role of a lever. The displacement of the pressing part of the insulating swing rod during the swinging process is greater than the displacement of the force transmission part. Therefore, the striker of the fuse only needs a small displacement to drive the pressing part of the insulating swing rod to make a large displacement, ensuring that the insulating swing rod can stably press the trigger end of the micro switch, thereby improving the reliability of the fuse blown indication device. In addition, since the insulating swing rod and the fuse are neither collinear nor parallel, but the structure of the vehicle body is reasonably utilized in the above technical scheme, while ensuring that the insulating swing rod leaves enough creepage distance, the swing of the insulating swing rod is used to trigger the micro switch, so that the size of the transformer trolley is reduced and the flexibility of use is improved.

[0031] As a further improvement, the blown fuse indication device further comprises a limit hinge support, the limit hinge support is located at one end of the insulating rocker arm away from the rotating part, and the limit hinge support is provided with a limit structure for limiting the swing angle of the insulating rocker arm.

[0032] The beneficial effect is that the limiting twisted support can limit the swing angle of the insulating swing arm, which can effectively improve the stability of the insulating swing arm.

[0033] As a further improvement, the limiting structure includes an arc-shaped long hole opened on the limiting hinge support, the center of the circle where the arc-shaped long hole is located is concentric with the rotation center of the rotating part, and the corresponding end of the insulating rocker arm is fixed with a pin shaft, and the pin shaft is passed through the arc-shaped long hole.

[0034] The beneficial effect is that the pin shaft is located in the arc-shaped long hole and is limited by the arc-shaped long hole, so that the pin shaft can only reciprocate along the arc-shaped long hole, thereby limiting the swing amplitude of the insulating swing rod.

[0035] As a further improvement, the blown fuse indicating device further comprises a fixed hinge support, and the insulating swing arm is hinged on the fixed hinge support.

[0036] The beneficial effect is that the fixed twisted support is used to be installed on the body of the transformer trolley, so that the insulating swing arm can swing relative to the body, and the modularization degree of the fuse blown indication device is improved, which is convenient for assemblers to perform installation operations.

[0037] As a further improvement, the force transmission portion is located in the middle of the insulating rocker.

[0038] The beneficial effects are: on the one hand, due to the lever effect of the insulating swing rod, the insulating swing rod amplifies the displacement of the force transmission part at the top pressure part while also reducing the force of the trigger end of the micro switch of the top pressure part. The force transmission part is arranged in the middle of the insulating swing rod to balance the above-mentioned influences, ensuring that the top pressure part has sufficient top pressure while having a larger displacement. On the other hand, arranging the force transmission part in the middle of the insulating swing rod can also balance the distance from the force transmission part to the rotating part and from the force transmission part to the top pressure part, so that the distance from the force transmission part to the rotating part and from the force transmission part to the top pressure part meets the requirements of the safe creepage distance.

[0039] As a further improvement, the pressing portion is located at an end of the insulating rocker arm away from the rotating portion.

[0040] The beneficial effect is that the above technical solution can maximize the utilization of the leverage effect of the insulating rocker rod.

[0041] As a further improvement, the insulating rocker arm is a slat-shaped structure, a push block for cooperating with a striker of the fuse is fixedly provided on the insulating rocker arm, and the force transmission part includes the push block.

[0042] The beneficial effect is that the insulating swing rod is set as a slat-shaped structure, which can effectively reduce the weight of the insulating swing rod and save the material of the supporting insulating swing rod. The above technical solution can reduce the weight of the insulating swing rod by setting a push block, and can also ensure a larger impact area for the striker, ensuring that the striker can stably contact the insulating swing rod and push the insulating swing rod.

[0043] As a further improvement, the insulating rocker arm includes a main rod body and an auxiliary push rod body perpendicular to the main rod body, the push block is connected to the end of the auxiliary push rod body, and the force transmission part also includes the auxiliary push rod body.

[0044] The beneficial effects are: on the one hand, due to the structural limitations of the existing fuse, the end of the fuse pin cannot directly contact the main rod body, so an auxiliary push rod body extending laterally from the main rod body is required for transmission. On the other hand, the auxiliary push rod body can further increase the creepage distance and enhance the insulation capacity of the insulating swing rod.

[0045] As a further improvement, the insulating rocker arm includes a main rod body and an auxiliary push rod body perpendicular to the main rod body, and the force transmission part includes the auxiliary push rod body.

[0046] The beneficial effects are: on the one hand, due to the structural limitations of the existing fuse, the end of the fuse pin cannot directly contact the main rod body, so an auxiliary push rod body extending laterally from the main rod body is required for transmission. On the other hand, the auxiliary push rod body can further increase the creepage distance and enhance the insulation capacity of the insulating swing rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of an existing voltage transformer trolley in the background technology of the present invention;

[0048] Figure 2 It is a structural schematic diagram of embodiment 1 of the transformer trolley in the present invention.

[0049] Description of reference numerals:

[0050] 1. Chassis; 2. Stand; 3. Transformer; 4. Fuse; 5. Fixed support; 6. Limit support; 7. Insulated rocker arm; 71. Main rod body; 72. Auxiliary push rod body; 8. Micro switch; 9. Pin shaft; 10. Long hole; 11. Push block. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0052] The present invention is further described in detail below in conjunction with embodiments.

[0053] Specific embodiment 1 of the transformer trolley provided by the present invention:

[0054] The transformer trolley provided in this embodiment includes a car body and a transformer, a fuse, a micro switch and a fuse blown indicator device installed on the car body. The fuse blown indicator device includes an insulating rocker arm whose upper end is hinged with the car body, the middle part of the insulating rocker arm has a force transmission part that cooperates with the striker of the fuse, and the lower part of the insulating rocker arm has a pressing part that is used to press with the trigger end of the micro switch. The insulating rocker arm can act as a lever, so that the pressing part has a larger displacement relative to the force transmission part, thereby ensuring that the insulating rocker arm can stably press and trigger the micro switch.

[0055] See attached Figure 2 The transformer trolley includes a trolley body and a transformer 3, a fuse 4, a micro switch 8 and a fuse blown indication device installed on the trolley body.

[0056] The vehicle body comprises a chassis 1 and a stand 2 fixedly arranged on one side of the chassis 1 .

[0057] The blown fuse indicating device comprises a fixed twisted support 5, a limit twisted support 6 and an insulating swing rod 7.

[0058] The fixed hinge support 5 and the position-limiting hinge support 6 are both fixedly mounted on the stand 2 by bolts, and the fixed hinge support 5 is located directly above the position-limiting hinge support 6 .

[0059] The insulating swing rod 7 includes a main rod body 71 arranged vertically and an auxiliary push rod body 72 which is perpendicular to the main rod body 71 and integrally formed. The auxiliary push rod body 72 is located in the middle of the side of the main rod body 71 away from the stand 2. The insulating swing rod 7 is a T-shaped structure as a whole. The middle part mentioned here refers to the center position and the position near the center. In this embodiment, the auxiliary push rod 72 is located in the center position of the main rod body 71. In order to save materials, the insulating swing rod 7 in this embodiment is a slat-shaped structure.

[0060] The upper end of the main rod body 71 is hinged to the fixed hinge support 5, and the hinge point between the main rod body 71 and the fixed hinge support 5 is the rotating part of the insulating swing arm. A pin shaft 9 is fixedly provided at the lower end of the main rod body 71, and a long hole 10 is provided on the limit hinge support 6. The pin shaft 9 is located in the long hole 10 and can slide along the long hole 10. The long hole 10 can limit the movement range of the pin shaft 9. The main rod body 71 can swing around the hinge point between it and the fixed hinge support 5, and the limit hinge support 6 can limit the swing amplitude of the main rod body 71.

[0061] The micro switch 8 is fixedly mounted on the stand 2. In this embodiment, the micro switch 8 has a trigger end, which is specifically an elastically arranged swing arm, and a roller is arranged at the end of the swing arm. The micro switch 8 is a prior art and will not be described in detail here. The micro switch 8 is located at one end of the main rod body 71 connected to the limit hinge support 6, and the trigger end of the micro switch 8 abuts against a side wall of the main rod body 71 close to the stand 2. The trigger end of the micro switch 8 supports the main rod body 71. To trigger the micro switch 8, the main rod body 71 needs to swing and press the trigger end of the micro switch.

[0062] The fuse 4 has a striker that can be ejected after it blows. The fuse 4 is a prior art and will not be described in detail here. The fuse 4 is located on the side of the insulating rocker 7 away from the stand 2. The striker of the fuse 4 faces the direction of the insulating rocker 7 and is directly opposite to the end of the auxiliary push rod body 72. The end of the auxiliary push rod body 72 is fixed with a cylindrical push block 11 by bolts. When the striker of the fuse 4 is in a retracted state, the side of the push block 11 away from the auxiliary push rod body 72 abuts against the striker. In this embodiment, the push block 11 and the auxiliary push rod body 72 both belong to the force transmission part. The push block 11 can increase the impact area of ​​the striker to ensure that the striker can drive the insulating rocker 7 to swing. In other embodiments, a gap may also be left between the push block 11 and the striker. The size of the gap needs to ensure that the striker can trigger the micro switch 8 by pushing the insulating rocker 7 after it pops out.

[0063] When the fuse 4 blows, the striker of the fuse 4 will pop out and hit the push block 11, so that the insulating rocker 7 will swing towards the stand 2. During this process, the insulating rocker 7 will push the trigger end of the micro switch 8, thereby triggering the micro switch 8 and causing it to send a signal.

[0064] The main rod body 71 of the insulating swing rod 7 is arranged vertically, which can reduce the length of the transformer trolley and improve the flexibility of use of the transformer trolley while ensuring sufficient creepage distance and electrical safety.

[0065] In addition, the insulating rocker 71 acts as a lever to amplify the stroke of the striker of the fuse 4. The striker of the fuse 4 only needs a smaller stroke to trigger the micro switch, thereby improving the sensitivity of the fuse blown indicator device.

[0066] Specific embodiment 2 of the transformer trolley provided by the present invention:

[0067] This embodiment provides another installation method of the insulating rocker arm. The only difference compared with Embodiment 1 is that in this embodiment, no limiting hinge support is provided, and the end of the insulating rocker arm away from the fixed hinge support is a free end.

[0068] In this embodiment, the insulating swing rod is vertically arranged, and the free end of the insulating swing rod is vertically downward. In other embodiments, the insulating swing rod can also be arranged horizontally or obliquely without setting a limiter support, and the free end of the insulating swing rod is not higher than the end connected to the fixed support.

[0069] Specific embodiment 3 of the transformer trolley provided by the present invention:

[0070] This embodiment provides another form of limiting structure, which is different from Embodiment 1 only in that, in this embodiment, an arc-shaped long hole is opened at the end of the insulating rocker rod, and a pin shaft matching the arc-shaped long hole is fixed on the limiting hinge support.

[0071] Specific embodiment 4 of the transformer trolley provided by the present invention:

[0072] This embodiment provides another installation method of the insulating rocker arm. The only difference compared with Embodiment 1 is that in this embodiment, no fixed hinge support is provided, and the rotating part of the insulating rocker arm is directly hinged to the vehicle body.

[0073] Specific embodiment 5 of the transformer trolley provided by the present invention:

[0074] This embodiment provides another form of an insulating rocker arm, and the only difference compared with the first embodiment is that the force transmission part in this embodiment is located on the insulating rocker arm close to the rotating part.

[0075] In other embodiments, the force transmission portion may also be located on the insulating rocker near the top pressure portion.

[0076] Specific embodiment 6 of the transformer trolley provided by the present invention:

[0077] This embodiment provides another form of an insulating rocker arm, and the only difference compared with the first embodiment is that the top pressure portion in this embodiment is located in the middle of the line connecting the force transmission portion and the limit hinge support.

[0078] Specific embodiment 7 of the transformer trolley provided by the present invention:

[0079] This embodiment provides another structural form of an insulating rocker rod, which is different from Embodiment 1 only in that the insulating rocker rod in this embodiment is a straight structure with a square cross-section.

[0080] In other embodiments, the cross-sectional shape of the insulating rocker rod may also be circular or annular.

[0081] Specific embodiment 8 of the transformer trolley provided by the present invention:

[0082] This embodiment provides another structural form of an insulating rocker arm. The only difference compared with Embodiment 1 is that this embodiment does not provide an auxiliary push rod body, and the insulating rocker arm is a straight long strip structure. In order to ensure effective contact between the insulating rocker arm and the trigger end of the micro switch and between the insulating rocker arm and the striker of the fuse, a push block is provided on the insulating rocker arm to increase the impact area.

[0083] Specific embodiment 9 of the transformer trolley provided by the present invention:

[0084] This embodiment provides another structural form of an insulating rocker arm, which is different from Embodiment 1 only in that, in this embodiment, no push block is provided at the end of the auxiliary push rod body, and the striker of the fuse directly strikes the end of the auxiliary push rod body.

[0085] Specific embodiment 10 of the transformer trolley provided by the present invention:

[0086] This embodiment provides another installation form of the insulating rocker arm, which is different from the first embodiment only in that the insulating rocker arm is installed horizontally in this embodiment.

[0087] In other embodiments, the insulating rocker rod may also be arranged at an angle.

[0088] Specific embodiments of the blown fuse indicator provided by the present invention:

[0089] The blown fuse indicator device is any one of the blown fuse indicator devices in Embodiments 1-10 of the transformer trolley of the present invention, and will not be described in detail here.

[0090] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blown fuse indicator, characterized in that: It includes an insulating rocker arm, which includes a rotating part hingedly installed relative to the body of the transformer trolley, so that the insulating rocker arm can swing as a whole relative to the body of the transformer trolley. The insulating rocker arm also includes a force transmission part for cooperating with the striker of the fuse and a pressing part for cooperating with the trigger end of the micro switch. The force transmission part is located between the rotating part and the pressing part.

2. The blown fuse indicator device according to claim 1, characterized in that: The blown fuse indicator device also includes a limit hinge support fixed on the body of the transformer trolley, the limit hinge support is located at one end of the insulating swing arm away from the rotating part, and the limit hinge support is provided with a limit structure for limiting the swing angle of the insulating swing arm.

3. The blown fuse indicator device according to claim 2, characterized in that: The limiting structure includes an arc-shaped long hole opened on the limiting hinge support, the center of the circle where the arc-shaped long hole is located is concentric with the rotation center of the rotating part, and the corresponding end of the insulating rocker arm is fixedly provided with a pin shaft, and the pin shaft is inserted into the arc-shaped long hole.

4. The blown fuse indicator device according to any one of claims 1 to 3, characterized in that: The blown fuse indicating device also includes a fixed hinge support for being fixed on the body of the transformer trolley, and the insulating swing arm is hinged on the fixed hinge support.

5. The blown fuse indicator device according to any one of claims 1 to 3, characterized in that: The force transmission part is located in the middle of the insulating rocker.

6. The blown fuse indicator device according to any one of claims 1 to 3, characterized in that: The pressing portion is located at an end of the insulating swing rod away from the rotating portion.

7. The blown fuse indicator device according to any one of claims 1 to 3, characterized in that: The insulating swing rod is a slat-shaped structure, a push block for cooperating with a striker of a fuse is fixedly arranged on the insulating swing rod, and the force transmission part includes the push block.

8. The blown fuse indicator device according to claim 7, characterized in that: The insulating rocker comprises a main rod body and an auxiliary push rod body perpendicular to the main rod body, the push block is connected to the end of the auxiliary push rod body, and the force transmission part also comprises the auxiliary push rod body.

9. The blown fuse indicator device according to any one of claims 1 to 3, characterized in that: The insulating rocker arm comprises a main rod body and an auxiliary push rod body perpendicular to the main rod body, and the force transmission part comprises the auxiliary push rod body.

10. A transformer trolley, comprising a trolley body and a transformer, a fuse and a micro switch arranged on the trolley body, characterized in that: The vehicle body is also provided with a blown fuse indicator device as described in any one of claims 1 to 9.

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