Power transmission and transformation self-recovery fuse self-checking device

Abstract

The invention discloses a power transmission and transformation self-recovery fuse self-checking device, and belongs to the technical field of self-recovery fuse detection, the power transmission and transformation self-recovery fuse self-checking device comprises an upper box body and a lower box body, one side of the upper box body is rotatably connected with one side of the lower box body, and the other side of the upper box body is detachably connected with the other side of the lower box body through a buckle; a detection assembly used for detecting the self-recovery fuse is arranged in the lower box body. The detection assembly comprises a circuit board fixedly arranged on the inner bottom surface of the lower box body, a power supply is arranged on the circuit board, the positive electrode end of the power supply is connected with a butt joint seat through a wire, an insertion groove is formed in the upper end of the butt joint seat, and the insertion groove is used for being detachably connected with a self-recovery fuse. And a fastening assembly used for fastening the self-recovery fuse support claw is arranged in the slot. According to the device provided by the invention, the self-detection of the self-recovery fuse can be realized quickly and conveniently.

Description

Technical Field

[0001] The invention belongs to the technical field of self-resettable fuse detection, and in particular relates to a self-detection device for self-resettable fuses for power transmission and transformation. Background Art

[0002] A resettable fuse is a fuse that automatically restores a circuit. When a circuit is overloaded or short-circuited, it automatically disconnects the circuit to protect other components in the circuit. Unlike traditional fuses, resettable fuses can automatically reconnect the circuit after the fault is eliminated, without the need to replace the fuse. The working principle of a resettable fuse is to use a special heat-sensitive material that melts quickly due to heat when the circuit is overloaded or short-circuited, thereby disconnecting the circuit. When the fault is eliminated, the material automatically cools and resolidifies, and the circuit is automatically restored. The advantage of a resettable fuse is that it can save the time and cost of replacing fuses, and at the same time reduce the equipment downtime caused by fuse failure.

[0003] The self-resetting fuse in the prior art does not have a self-checking function. If the fuse fails, the circuit cannot be cut off immediately, which may cause the electrical appliance to burn out or even cause a fire. Patent document announcement number: CN112735927B discloses a self-test device for a self-resettable fuse, including a fuse, a U-shaped base, a self-test box, an electromagnetic relay, an open current transformer and a self-test mechanism. The self-test mechanism includes a transmission arm, a booster, an electromagnet, a battery pack and a main control unit. After the main control unit controls the electromagnet to be energized, the electromagnetic relay is closed, the power supply of the transmission line is cut off, and then the booster is controlled to gradually boost the power of the battery pack, and the power is transmitted to the fuse through the transmission arm, and the transmitted power reaches the limit of the fuse. If the fuse has a fault, it will not be blown. At this time, the open current transformer can sense the current signal, and the main control unit can control the alarm to alarm, prompting the staff to replace or repair it in time to prevent the faulty fuse from failing to blow normally when an overcurrent accident occurs, resulting in damage to electrical equipment and fire. The self-test device disclosed in this patent is not practical in practice, so an improved self-test device for a resettable fuse is needed to enable quick and convenient self-testing of the resettable fuse. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a self-test device for a power transmission and transformation self-resettable fuse, thereby solving the problems in the above-mentioned background technology.

[0005] The object of the present invention is achieved as follows: a self-inspection device for a power transmission and transformation resettable fuse, which comprises an upper box and a lower box, wherein the upper box is rotatably connected to one side of the lower box and the other side is detachably connected by a snap-on connection; a detection component for detecting the resettable fuse is arranged inside the lower box; the detection component comprises a circuit board fixedly arranged on the bottom surface of the lower box, a power supply is arranged on the circuit board, a positive terminal wire of the power supply is connected to a docking seat, a plug-in slot is provided at the upper end of the docking seat, the plug-in slot is used for detachably connecting the resettable fuse, and a fastening component for fastening the claw of the resettable fuse is arranged inside the slot.

[0006] Furthermore, the detection component also includes a load device connected in series with the docking socket through a wire, the other end of the load device is connected in series with a first connecting socket, and a first contact terminal is provided on the side wall of the first connecting socket; the negative end wire of the power supply is connected to a second connecting socket, and a second contact terminal is provided on the side wall of the second connecting socket, and the second contact terminal is provided corresponding to the first contact terminal; the interior of the lower box is provided with an auxiliary component for electrically conducting the first contact terminal and the second contact terminal.

[0007] Furthermore, the auxiliary component includes a guide groove opened on the upper surface of the circuit board, the inside of the guide groove is slidably connected to a base, the left side wall of the base is fixedly provided with a contact conductive plate, the upper end of the base is fixedly provided with a hand-push portion, and the hand-push portion is used to more conveniently move the base inside the guide groove; the side wall of the base is provided with a first power-assisting component corresponding to the first connecting seat, and a second power-assisting component corresponding to the second connecting seat.

[0008] Further, the guide groove includes a first groove and a second groove, and the first groove and the second groove are arranged parallel to each other, and the lower end of the base is fixedly provided with a first sliding protrusion corresponding to the first groove, and a second sliding protrusion corresponding to the second groove, and the first sliding protrusion is slidably connected inside the first groove, and the second sliding protrusion is slidably connected inside the second groove.

[0009] Furthermore, the first power-assisting component includes a rear support plate fixedly connected to the rear side wall of the base, and a rear support ear fixedly connected to the rear side wall of the second connecting seat, and the rear support plate and the rear support ear are connected by a first spring; the second power-assisting component includes a front support plate fixedly connected to the front side wall of the base, and a front support ear fixedly connected to the front side wall of the first connecting seat, and the front support plate and the front support ear are connected by a second spring; and when the first spring and the second spring are in a naturally straightened state, the contact conductive plate is separated from the first contact terminal and the second contact terminal.

[0010] Furthermore, the fastening assembly includes a third spring fixedly connected to the inner wall of the plug-in slot and extending laterally, and an extrusion plate is rotatably connected to the inner wall of the plug-in slot and located above the third spring. The extrusion plate is used to move closer to the side wall of the plug-in slot when the claw of the self-resetting fuse is inserted into the docking slot. The third spring is compressed and the extrusion plate applies a lateral force to the claw, so that the claw is firmly connected inside the plug-in slot.

[0011] Furthermore, the third spring includes a left three-spring and a right three-spring, the extrusion plate includes a left pressure plate and a right pressure plate, and the left pressure plate and the right pressure plate are symmetrically arranged with each other, so that the support claw is subjected to balanced lateral forces on the left and right sides after being inserted into the plug-in slot, thereby protecting the support claw from deformation and damage due to the action of force.

[0012] Furthermore, a lamp holder is fixedly provided on the upper surface of the circuit board and located on the side of the docking seat, and a warning light is provided at the upper end of the lamp holder, and the warning light is electrically connected in parallel with the docking seat.

[0013] Furthermore, the warning light is an LED light, the on-state voltage drop of the warning light is 2V, and the warning light is electrically connected in series with a resistor, the resistor is used to limit the current flowing through the warning light and thus damage the warning light, and the resistor is used to protect the warning light.

[0014] Furthermore, a carrying ring is fixedly provided on the side wall of the lower box body, and the carrying ring is used to facilitate the movement of the self-inspection device.

[0015] The beneficial effects of the present invention are as follows: through the arrangement of the upper box and the lower box, the upper box and the lower box are used to protect the circuit board therein after closing, so as to protect the detection component, avoid accidental damage thereof, and extend the service life. Through the arrangement of the power supply, it is used to provide the voltage of the detection circuit when detecting the self-resetting fuse, so that current flows through the detection circuit. When in use, the self-resetting fuse to be detected is inserted into the plug-in slot of the docking seat. After the self-resetting fuse is inserted into the plug-in slot, the fastening assembly is used to fix the claw of the self-resetting fuse in the plug-in slot to make its electrical connection more stable. When the self-resetting fuse is inserted into the plug-in slot, the detection circuit of the detection assembly is turned on so that current flows through the self-resetting fuse. When the current flowing through the self-resetting fuse is less than the rated current of the self-resetting fuse itself, the detection circuit works normally, and the load device of the detection circuit works normally. At this time, the load device is adjusted to a short-circuit state. After a short circuit occurs, the current flowing through the self-resetting fuse itself becomes larger, and the temperature of the self-resetting fuse increases, forming a disconnected circuit. At this time, the circuit power supply of the detection component is disconnected, and the self-resetting fuse is pulled out of the plug slot to cool, and the load device is adjusted from the short-circuit state to a normal state. After waiting for the temperature of the self-resetting fuse to drop, the self-resetting fuse is inserted into the plug slot again, and the circuit power supply of the detection component is turned on. If the load device can work normally, it proves that the detected self-resetting fuse is a normal self-resetting fuse. If the load device cannot work normally, it proves that the detected self-resetting fuse is an abnormal fuse. The self-test device of the present invention can quickly complete the self-test of the self-resetting fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a left-side stereoscopic structural schematic diagram of the present invention; Figure 2 It is a right-side stereoscopic structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the internal structure of the lower box body of the present invention; Figure 4 It is a schematic diagram of the internal three-dimensional structure of the lower box body of the present invention; Figure 5 The present invention Figure 4 Middle A: Enlarged view; Figure 6 It is a schematic diagram of the internal structure of the low-temperature self-resetting fuse of the present invention; Figure 7 It is a schematic diagram of the internal structure of the high temperature resettable fuse of the present invention; Figure 8 The present invention Figure 4 Middle B: Enlarged view; Fig. 9 It is a schematic diagram of the internal structure of the plug slot of the present invention.

[0017] In the figure: 1, lower box body 2, upper box body 3, circuit board 4, power supply 5, docking seat 6, plug slot 7, resettable fuse 8, load device 9, first connecting seat 10, second connecting seat 11, first contact terminal 12, second contact terminal 13, guide groove 14, base 15, push part 16, rear support plate 17, rear support ear 18, first spring 19, second spring 20, third spring 21, extrusion plate 22, lamp holder 23, warning light 24, inner left conductive plate 25, inner right conductive plate 26, polymer resin 27, conductive particles. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below with reference to the accompanying drawings. It should be noted that all directional words such as up, down, front, back, left, and right that appear in the present invention are based on Figure 1 The directional words are made for reference figures, and all directional words do not limit the present invention, but are only for more clear illustration and explanation of the present invention. Example

[0019] like Figure 1-9 As shown, the present embodiment discloses a self-inspection device for a power transmission and transformation resettable fuse, which comprises an upper box body 2 and a lower box body 1, wherein the upper box body 2 is rotatably connected to one side of the lower box body 1, and the other side thereof is detachably connected by a snap-on connection; a detection component for detecting a resettable fuse 7 is arranged inside the lower box body 1; the detection component comprises a circuit board 3 fixedly arranged on the inner bottom surface of the lower box body 1, a power supply 4 is arranged on the circuit board 3, a positive terminal wire of the power supply 4 is connected to a docking seat 5, a plug-in slot 6 is provided at the upper end of the docking seat 5, the plug-in slot 6 is used for detachably connecting the resettable fuse 7, and a fastening component for fastening the claws of the resettable fuse 7 is arranged inside the slot. The resettable fuse 7 includes a shell, and an inner left conductive plate 24 and an inner right guide plate are fixedly arranged inside the shell. A polymer resin 26 is arranged between the inner left conductive plate 24 and the inner right conductive plate 25. When in use, when the shell temperature rises, a plurality of polymer resins 26 separate from each other, and then the conductive particles 27 adsorbed on the outside of the polymer resin 26 separate and cannot form a conducting circuit; when the shell temperature drops, a plurality of polymer resins 26 are again connected to each other, and the conductive particles 27 are connected to form a conducting circuit. Thus, when the temperature rises, the resettable fuse 7 does not work, and when the temperature drops, the resettable fuse 7 can work again, and the fuse can be self-restored.

[0020] In this embodiment, the upper box 2 and the lower box 1 are provided. After the upper box 2 and the lower box 1 are closed, the circuit board 3 inside is protected to protect the detection component, avoid accidental damage and extend the service life. The power supply 4 is provided to provide the voltage of the detection circuit when detecting the self-resetting fuse 7, so that current flows through the detection circuit. When in use, the self-resetting fuse 7 to be detected is inserted into the plug slot 6 of the docking seat 5. After the self-resetting fuse 7 is inserted into the plug slot 6, the fastening component is used to fix the claw of the self-resetting fuse 7 in the plug slot 6 to make its electrical connection more stable. When the self-resetting fuse 7 is inserted into the plug slot 6, the detection circuit of the detection component is turned on, so that current flows through the self-resetting fuse 7. When the current flowing through the self-resetting fuse 7 is less than the rated current of the self-resetting fuse 7 itself, the detection circuit works normally, and the load device 8 of the detection circuit works normally. At this time, the load device 8 is adjusted to a short-circuit state. After a short circuit occurs, the current flowing through the self-resetting fuse 7 itself becomes larger, and the temperature of the self-resetting fuse 7 increases, forming a disconnected circuit. At this time, the circuit power supply 4 of the detection component is disconnected, and the self-resetting fuse 7 is pulled out of the plug slot 6 for cooling, and the load device 8 is adjusted from the short-circuit state to the normal state. After waiting for the temperature of the self-resetting fuse 7 to drop, the self-resetting fuse 7 is inserted into the plug slot 6 again, and the circuit power supply 4 of the detection component is turned on. If the load device 8 can work normally, it proves that the detected self-resetting fuse 7 is a normal self-recoverable fuse. If the load device 8 cannot work normally, it proves that the detected self-resetting fuse 7 is an abnormal fuse. The self-test device of the present invention can quickly complete the self-test work of the self-resetting fuse 7. Example

[0021] like Figure 1-9As shown, the present embodiment discloses a self-inspection device for a power transmission and transformation resettable fuse, which comprises an upper box body 2 and a lower box body 1, wherein the upper box body 2 is rotatably connected to one side of the lower box body 1, and the other side thereof is detachably connected by a snap-on connection; a detection component for detecting a resettable fuse 7 is arranged inside the lower box body 1; the detection component comprises a circuit board 3 fixedly arranged on the inner bottom surface of the lower box body 1, a power supply 4 is arranged on the circuit board 3, a positive terminal wire of the power supply 4 is connected to a docking seat 5, a plug-in slot 6 is provided at the upper end of the docking seat 5, the plug-in slot 6 is used for detachably connecting the resettable fuse 7, and a fastening component for fastening the claws of the resettable fuse 7 is arranged inside the slot. The resettable fuse 7 includes a shell, and an inner left conductive plate 24 and an inner right guide plate are fixedly arranged inside the shell. A polymer resin 26 is arranged between the inner left conductive plate 24 and the inner right conductive plate 25. When in use, when the shell temperature rises, a plurality of polymer resins 26 separate from each other, and then the conductive particles 27 adsorbed on the outside of the polymer resin 26 separate and cannot form a conducting circuit; when the shell temperature drops, a plurality of polymer resins 26 are again connected to each other, and the conductive particles 27 are connected to form a conducting circuit. Thus, when the temperature rises, the resettable fuse 7 does not work, and when the temperature drops, the resettable fuse 7 can work again, and the fuse can be self-restored.

[0022] For better effect, the detection component also includes a load device 8 connected in series with the docking seat 5 through a wire, the other end of the load device 8 is connected in series with a first connection seat 9, and the side wall of the first connection seat 9 is provided with a first contact terminal 11; the negative end wire of the power supply 4 is connected to the second connection seat 10, and the side wall of the second connection seat 10 is provided with a second contact terminal 12, and the second contact terminal 12 is arranged corresponding to the first contact terminal 11; the interior of the lower box 1 is provided with an auxiliary component for electrically connecting the first contact terminal 11 and the second contact terminal 12. When in use, under the action of the auxiliary component, the first contact terminal 11 is connected with the second contact terminal 12, and then the circuit of the detection component is turned on, and under the action of the power supply 4, current flows through the detection circuit to realize the detection of the self-resetting fuse 7.

[0023] For better effect, the auxiliary component includes a guide groove 13 opened on the upper surface of the circuit board 3, a base 14 is slidably connected inside the guide groove 13, a contact conductive plate is fixedly provided on the left side wall of the base 14, and a hand pusher 15 is fixedly provided on the upper end of the base 14, and the hand pusher 15 is used to more conveniently move the base 14 inside the guide groove 13; the side wall of the base 14 is provided with a first power assist component corresponding to the first connection seat 9, and a second power assist component corresponding to the second connection seat 10. The first power assist component and the second power assist component are used to make the circuit of the detection component open when the operator does not perform the self-resettable fuse 7 detection. When in use, the operator holds the hand pusher 15 with his hand and slides the base 14 along the guide groove 13, so that the base 14 slides to the left to connect the contact conductive plate with the first contact terminal 11 and the second contact terminal 12, and the first contact terminal 11 and the second contact terminal 12 are electrically connected through the action of the contact conductive plate.

[0024] For better effect, the guide groove 13 includes a first groove and a second groove, and the first groove and the second groove are arranged parallel to each other. The lower end of the base 14 is fixedly provided with a first sliding protrusion corresponding to the first groove and a second sliding protrusion corresponding to the second groove, and the first sliding protrusion is slidably connected inside the first groove, and the second sliding protrusion is slidably connected inside the second groove. The first boosting assembly includes a rear support plate 16 fixedly connected to the rear side wall of the base 14, and a rear support ear 17 fixedly connected to the rear side wall of the second connecting seat 10, and the rear support plate 16 and the rear support ear 17 are connected by a first spring 18; the second boosting assembly includes a front support plate fixedly connected to the front side wall of the base 14, and a front support ear fixedly connected to the front side wall of the first connecting seat 9, and the front support plate and the front support ear are connected by a second spring 19; and when the first spring 18 and the second spring 19 are in a naturally straightened state, the contact conductive plate is separated from the first contact terminal 11 and the second contact terminal 12.

[0025] In this embodiment, the upper box 2 and the lower box 1 are provided. After the upper box 2 and the lower box 1 are closed, the circuit board 3 inside is protected to protect the detection component, avoid accidental damage and extend the service life. The power supply 4 is provided to provide the voltage of the detection circuit when detecting the self-resetting fuse 7, so that current flows through the detection circuit. When in use, the self-resetting fuse 7 to be detected is inserted into the plug slot 6 of the docking seat 5. After the self-resetting fuse 7 is inserted into the plug slot 6, the fastening component is used to fix the claw of the self-resetting fuse 7 in the plug slot 6 to make its electrical connection more stable. When the self-resetting fuse 7 is inserted into the plug slot 6, the detection circuit of the detection component is turned on, so that current flows through the self-resetting fuse 7. When the current flowing through the self-resetting fuse 7 is less than the rated current of the self-resetting fuse 7 itself, the detection circuit works normally, and the load device 8 of the detection circuit works normally. At this time, the load device 8 is adjusted to a short-circuit state. After a short circuit occurs, the current flowing through the self-resetting fuse 7 itself becomes larger, and the temperature of the self-resetting fuse 7 increases, forming a disconnected circuit. At this time, the circuit power supply 4 of the detection component is disconnected, and the self-resetting fuse 7 is pulled out of the plug slot 6 for cooling, and the load device 8 is adjusted from the short-circuit state to the normal state. After waiting for the temperature of the self-resetting fuse 7 to drop, the self-resetting fuse 7 is inserted into the plug slot 6 again, and the circuit power supply 4 of the detection component is turned on. If the load device 8 can work normally, it proves that the detected self-resetting fuse 7 is a normal self-recoverable fuse. If the load device 8 cannot work normally, it proves that the detected self-resetting fuse 7 is an abnormal fuse. The self-test device of the present invention can quickly complete the self-test work of the self-resetting fuse 7. Example

[0026] like Figure 1-9As shown, the present embodiment discloses a self-inspection device for a power transmission and transformation resettable fuse, which comprises an upper box body 2 and a lower box body 1, wherein the upper box body 2 is rotatably connected to one side of the lower box body 1, and the other side thereof is detachably connected by a snap-on connection; a detection component for detecting a resettable fuse 7 is arranged inside the lower box body 1; the detection component comprises a circuit board 3 fixedly arranged on the inner bottom surface of the lower box body 1, a power supply 4 is arranged on the circuit board 3, a positive terminal wire of the power supply 4 is connected to a docking seat 5, a plug-in slot 6 is provided at the upper end of the docking seat 5, the plug-in slot 6 is used for detachably connecting the resettable fuse 7, and a fastening component for fastening the claws of the resettable fuse 7 is arranged inside the slot. The resettable fuse 7 includes a shell, and an inner left conductive plate 24 and an inner right guide plate are fixedly arranged inside the shell. A polymer resin 26 is arranged between the inner left conductive plate 24 and the inner right conductive plate 25. When in use, when the shell temperature rises, a plurality of polymer resins 26 separate from each other, and then the conductive particles 27 adsorbed on the outside of the polymer resin 26 separate and cannot form a conducting circuit; when the shell temperature drops, a plurality of polymer resins 26 are again connected to each other, and the conductive particles 27 are connected to form a conducting circuit. Thus, when the temperature rises, the resettable fuse 7 does not work, and when the temperature drops, the resettable fuse 7 can work again, and the fuse can be self-restored.

[0027] For better effect, the detection component also includes a load device 8 connected in series with the docking seat 5 through a wire, the other end of the load device 8 is connected in series with a first connection seat 9, and the side wall of the first connection seat 9 is provided with a first contact terminal 11; the negative end wire of the power supply 4 is connected to the second connection seat 10, and the side wall of the second connection seat 10 is provided with a second contact terminal 12, and the second contact terminal 12 is arranged corresponding to the first contact terminal 11; the interior of the lower box 1 is provided with an auxiliary component for electrically connecting the first contact terminal 11 and the second contact terminal 12. When in use, under the action of the auxiliary component, the first contact terminal 11 is connected with the second contact terminal 12, and then the circuit of the detection component is turned on, and under the action of the power supply 4, current flows through the detection circuit to realize the detection of the self-resetting fuse 7.

[0028] For better effect, the auxiliary component includes a guide groove 13 opened on the upper surface of the circuit board 3, a base 14 is slidably connected inside the guide groove 13, a contact conductive plate is fixedly provided on the left side wall of the base 14, and a hand pusher 15 is fixedly provided on the upper end of the base 14, and the hand pusher 15 is used to more conveniently move the base 14 inside the guide groove 13; the side wall of the base 14 is provided with a first power assist component corresponding to the first connection seat 9, and a second power assist component corresponding to the second connection seat 10. The first power assist component and the second power assist component are used to make the circuit of the detection component open when the operator does not perform the self-resettable fuse 7 detection. When in use, the operator holds the hand pusher 15 with his hand and slides the base 14 along the guide groove 13, so that the base 14 slides to the left to connect the contact conductive plate with the first contact terminal 11 and the second contact terminal 12, and the first contact terminal 11 and the second contact terminal 12 are electrically connected through the action of the contact conductive plate.

[0029] For better effect, the guide groove 13 includes a first groove and a second groove, and the first groove and the second groove are arranged parallel to each other. The lower end of the base 14 is fixed with a first sliding protrusion corresponding to the first groove, and a second sliding protrusion corresponding to the second groove, and the first sliding protrusion is slidably connected to the inside of the first groove, and the second sliding protrusion is slidably connected to the inside of the second groove.

[0030] For better effect, the first power-assisting component includes a rear support plate 16 fixedly connected to the rear side wall of the base 14, and a rear support ear 17 fixedly connected to the rear side wall of the second connecting seat 10, and the rear support plate 16 and the rear support ear 17 are connected by a first spring 18; the second power-assisting component includes a front support plate fixedly connected to the front side wall of the base 14, and a front support ear fixedly connected to the front side wall of the first connecting seat 9, and the front support plate and the front support ear are connected by a second spring 19; and when the first spring 18 and the second spring 19 are in a naturally straightened state, the contact conductive plate is separated from the first contact terminal 11 and the second contact terminal 12.

[0031] In this embodiment, the fastening assembly includes a third spring 20 fixedly connected to the inner side wall of the plug slot 6 and extending laterally, and a pressing plate 21 is rotatably connected to the inner side wall of the plug slot 6 and located above the third spring 20. The pressing plate 21 is used for when the claw of the self-resetting fuse 7 is inserted into the docking slot, the pressing plate 21 moves closer to the side wall of the plug slot 6, the third spring 20 is compressed, and the pressing plate 21 applies a lateral force to the claw, so that the claw is firmly connected inside the plug slot 6. The third spring 20 includes a left three springs and a right three springs, and the pressing plate 21 includes a left pressure plate and a right pressure plate, and the left pressure plate and the right pressure plate are symmetrically arranged to make the claw receive a balanced lateral force on the left and right sides after being inserted into the plug slot 6, so as to protect the claw from deformation and damage due to the force.

[0032] In this embodiment, a lamp holder 22 is fixedly provided on the upper surface of the circuit board 3 and located on the side of the docking seat 5. A warning light 23 is provided on the upper end of the lamp holder 22. The warning light 23 is electrically connected in parallel with the docking seat 5. The warning light 23 is an LED lamp. The conduction voltage drop of the warning light 23 is 2V. The warning light 23 is electrically connected in series with a resistor. The resistor is used to limit the current flowing through the warning light 23 to damage the warning light 23. The resistor is used to protect the warning light 23. A hand ring is fixedly provided on the side wall of the lower box 1. The hand ring is used to facilitate the movement of the self-test device.

[0033] In this embodiment, the upper box 2 and the lower box 1 are provided. After the upper box 2 and the lower box 1 are closed, the circuit board 3 inside is protected to protect the detection component, avoid accidental damage and extend the service life. The power supply 4 is provided to provide the voltage of the detection circuit when detecting the self-resetting fuse 7, so that current flows through the detection circuit. When in use, the self-resetting fuse 7 to be detected is inserted into the plug slot 6 of the docking seat 5. After the self-resetting fuse 7 is inserted into the plug slot 6, the fastening component is used to fix the claw of the self-resetting fuse 7 in the plug slot 6 to make its electrical connection more stable. When the self-resetting fuse 7 is inserted into the plug slot 6, the detection circuit of the detection component is turned on, so that current flows through the self-resetting fuse 7. When the current flowing through the self-resetting fuse 7 is less than the rated current of the self-resetting fuse 7 itself, the detection circuit works normally, and the load device 8 of the detection circuit works normally. At this time, the load device 8 is adjusted to a short-circuit state. After a short circuit occurs, the current flowing through the self-resetting fuse 7 itself becomes larger, and the temperature of the self-resetting fuse 7 increases, forming a disconnected circuit. At this time, the circuit power supply 4 of the detection component is disconnected, and the self-resetting fuse 7 is pulled out of the plug slot 6 for cooling, and the load device 8 is adjusted from the short-circuit state to the normal state. After waiting for the temperature of the self-resetting fuse 7 to drop, the self-resetting fuse 7 is inserted into the plug slot 6 again, and the circuit power supply 4 of the detection component is turned on. If the load device 8 can work normally, it proves that the detected self-resetting fuse 7 is a normal self-recoverable fuse. If the load device 8 cannot work normally, it proves that the detected self-resetting fuse 7 is an abnormal fuse. The self-test device of the present invention can quickly complete the self-test work of the self-resetting fuse 7.

[0034] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-test device for a power transmission and transformation self-resettable fuse, comprising an upper box (2) and a lower box (1), characterized in that: The upper case (2) is rotatably connected to one side of the lower case (1), and the other side is detachably connected by snap-fit; a detection component for detecting a resettable fuse (7) is arranged inside the lower case (1); the detection component comprises a circuit board (3) fixedly arranged on the inner bottom surface of the lower case (1), a power supply (4) is arranged on the circuit board (3), a positive terminal wire of the power supply (4) is connected to a docking seat (5), a plug-in slot (6) is provided at the upper end of the docking seat (5), the plug-in slot (6) is used for detachably connecting the resettable fuse (7), and a fastening component for fastening a claw of the resettable fuse (7) is arranged inside the slot.

2. The self-test device for the self-resettable fuse for power transmission and transformation according to claim 1, characterized in that: The detection component further comprises a load device (8) connected in series with the docking seat (5) via a wire, the other end of the load device (8) being connected in series with a first connection seat (9), a side wall of the first connection seat (9) being provided with a first contact terminal (11); the negative end of the power source (4) being connected to a second connection seat (10), a side wall of the second connection seat (10) being provided with a second contact terminal (12), and the second contact terminal (12) being provided corresponding to the first contact terminal (11); and an auxiliary component for electrically conducting the first contact terminal (11) and the second contact terminal (12) being provided inside the lower box (1).

3. The self-test device for the self-resettable fuse for power transmission and transformation according to claim 2 is characterized in that: The auxiliary component comprises a guide groove (13) provided on the upper surface of the circuit board (3); a base (14) is slidably connected inside the guide groove (13); a contact conductive plate is fixedly provided on the left side wall of the base (14); a hand push portion (15) is fixedly provided on the upper end of the base (14); the hand push portion (15) is used to more conveniently move the base (14) inside the guide groove (13); and a first power assist component corresponding to the first connecting seat (9) and a second power assist component corresponding to the second connecting seat (10) are provided on the side wall of the base (14).

4. The self-test device for the self-resettable fuse for power transmission and transformation according to claim 3 is characterized in that: The guide groove (13) comprises a first groove and a second groove, and the first groove and the second groove are arranged parallel to each other. A first sliding protrusion corresponding to the first groove and a second sliding protrusion corresponding to the second groove are fixedly provided at the lower end of the base (14), and the first sliding protrusion is slidably connected to the inside of the first groove, and the second sliding protrusion is slidably connected to the inside of the second groove.

5. The self-test device for the self-resettable fuse for power transmission and transformation according to claim 3 is characterized in that: The first power-assisting assembly comprises a rear support plate (16) fixedly connected to the rear side wall of the base (14), and a rear support ear (17) fixedly connected to the rear side wall of the second connecting seat (10), wherein the rear support plate (16) and the rear support ear (17) are connected via a first spring (18); the second power-assisting assembly comprises a front support plate fixedly connected to the front side wall of the base (14), and a front support ear fixedly connected to the front side wall of the first connecting seat (9), wherein the front support plate and the front support ear are connected via a second spring (19); and when the first spring (18) and the second spring (19) are in a naturally straightened state, the contact conductive plate is separated from the first contact terminal (11) and the second contact terminal (12).

6. The self-test device for the self-resettable fuse for power transmission and transformation according to claim 1, characterized in that: The fastening assembly comprises a third spring (20) fixedly connected to the inner side wall of the plug-in slot (6) and extending laterally, and a pressing plate (21) is rotatably connected to the inner side wall of the plug-in slot (6) and located above the third spring (20). The pressing plate (21) is used for when the claw of the self-resetting fuse (7) is inserted into the docking slot, the pressing plate (21) moves closer to the side wall of the plug-in slot (6), the third spring (20) is compressed, and the pressing plate (21) exerts a lateral force on the claw, so that the claw is firmly connected inside the plug-in slot (6).

7. The self-test device for the self-resettable fuse for power transmission and transformation according to claim 6, characterized in that: The third spring (20) includes a left third spring and a right third spring, and the extrusion plate (21) includes a left pressure plate and a right pressure plate, and the left pressure plate and the right pressure plate are symmetrically arranged to ensure that the lateral forces on the left and right sides of the support claw are balanced after the support claw is inserted into the insertion slot (6), thereby protecting the support claw from deformation and damage due to the effect of the force.

8. The self-test device for the self-resettable fuse for power transmission and transformation according to claim 1, characterized in that: A lamp holder (22) is fixedly provided on the upper surface of the circuit board (3) and located on the side of the docking seat (5), and a warning light (23) is provided at the upper end of the lamp holder (22), and the warning light (23) is electrically connected in parallel with the docking seat (5).

9. The self-test device for the self-resettable fuse for power transmission and transformation according to claim 8, characterized in that: The warning light (23) is an LED light, the on-state voltage drop of the warning light (23) is 2V, and the warning light (23) is electrically connected in series with a resistor, the resistor is used to limit the current flowing through the warning light (23) to prevent the warning light (23) from being damaged due to excessive current, and the resistor is used to protect the warning light (23).

10. The self-test device for the self-resettable fuse for power transmission and transformation according to claim 1, characterized in that: A carrying ring is fixedly provided on the side wall of the lower box body (1), and the carrying ring is used to facilitate the movement of the self-test device.

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