CN110783048A

CN110783048A - Fuse resistor

Info

Publication number: CN110783048A
Application number: CN201911054816.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Chu Jianxiang
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-02-11
Anticipated expiration: 2039-10-31
Also published as: CN110783048B

Abstract

The invention belongs to the technical field of resistors, and particularly relates to a fuse resistor; the resistance wire comprises a resistance body, a resistance wire and a circuit breaking unit; the resistance wire is wound on the resistance body; the circuit breaking unit comprises a separation stop block, a bracket and a hard alloy blade; the separation block is arranged on the resistance wire, is made of polytetrafluoroethylene and is provided with a V-shaped groove; the bracket is arranged at the position of the resistor body close to the spacing block; the hard alloy blade is arranged on the bracket through a spring, an insulating layer is coated on the surface of the hard alloy blade, the hard alloy blade comprises a cutter bar and a cutter head, and the cutter head is clamped into the V-shaped groove under the elastic action of the spring; the cooperation of resistance body, resistance wire and the unit that opens circuit has realized that when the current anomaly makes the resistor temperature rise, can realize the automatic circuit breaking of resistor to improve the safety in utilization of resistor, improve the safety sensitivity of resistor.

Description

Fuse resistor

Technical Field

The invention belongs to the technical field of resistors, and particularly relates to a fuse resistor.

Background

The structure of the existing fuse resistor is as follows: the two ends of the core rod are sleeved with caps, the core rod is wound with common resistance wires, the two ends of the common resistance wires are respectively connected with the two caps, and the outsides of the core rod, the caps and the common resistance wires are coated with flame-retardant paint. The resistor with the structure adopts a common resistance wire which is generally a metal alloy wire. When the current passing through the resistor is abnormal and the current value exceeds the rated current of the resistor greatly, the resistance wire generates heat to enable the temperature of the resistor to be rapidly increased to the melting point temperature of the resistance wire, and the resistance wire is fused before the surface of the resistor and the surrounding environment of the resistor perform sufficient heat exchange, so that the purpose of protecting the circuit is achieved. Meanwhile, the common resistance wire has a certain resistance value, and the resistor can play a role in limiting current when the circuit works normally.

However, the melting point of the common resistance wire is higher, usually above 600 ℃, so that the winding resistor has potential safety hazard: when the current passing through the resistor is abnormal and the current value is larger than the rated current and is small, the heat generated by the resistance wire is relatively small, and meanwhile, the surface of the resistor continuously exchanges heat with the surrounding environment, so that the temperature of the resistor cannot be rapidly increased to the melting point temperature of the resistance wire to be fused, and the temperature of the surface of the resistor and the surrounding environment is increased to more than 300 ℃, and other devices are burnt.

Disclosure of Invention

In order to make up the deficiency of the prior art, solve the current through the resistor is unusual, and the current value is greater than its rated current and smaller, the heat that the resistance wire produces is relatively less, the surface of the resistor exchanges heat with its surrounding environment constantly at the same time, not only can not make the temperature of the resistor rise to the melting point temperature of the resistance wire rapidly and produce the fusing, and cause the surface of the resistor and its temperature of the surrounding environment to rise to above 300 duC, cause the problem of the phenomenon of burning out other devices; the invention provides a fuse resistor.

The technical scheme adopted by the invention for solving the technical problems is as follows: the fuse resistor comprises a resistor body, a resistance wire and a circuit breaking unit; the resistance wire is wound on the resistance body; the circuit breaking unit comprises a separation stop block, a bracket and a hard alloy blade; the isolation baffle block is arranged on the resistance wire, is made of polytetrafluoroethylene and is provided with a V-shaped groove; the bracket is arranged at the position of the resistor body close to the spacing stop block; the hard alloy blade is arranged on the support through a spring, an insulating layer is coated on the surface of the hard alloy blade, the hard alloy blade comprises a cutter bar and a cutter head, and the cutter head is clamped into the V-shaped groove under the elastic action of the spring; the automatic disconnection of the resistor can be realized by matching the resistor body, the resistance wire and the disconnection unit when the temperature of the resistor is increased due to abnormal current; the during operation, when the resistor is in normal operating condition, the carbide blade contacts with separating the dog under the spring action of spring, and make the tool bit card in the V-arrangement inslot, after the electric current through the resistor is unusual, the resistor can produce a large amount of heats, when the heat that the resistor produced is not enough to let the resistance wire fusing, the resistor can continue to work, the material can melt earlier for polytetrafluoroethylene's separating the dog this moment, then the carbide blade falls in the spring action whereabouts of spring, thereby cut off the resistance wire, after the resistance wire is cut off, realize the outage of resistor, avoid the resistor to burn other devices after lasting work, thereby improve the safety in utilization of resistor, the safety and sensitivity of improvement resistor.

Preferably, the cutter heads are symmetrically hinged on the cutter bar, so that the two cutter heads are in a combined state when the separation block is not melted, and the two cutter heads can be opened under the compression of the cutter bar after the separation block is melted; the outer side wall of the tool bit, which is close to the resistance wire, is provided with a sponge block; the resistance wire is cut off and clamped into the sponge block through the matching of the cutter head and the sponge block, so that the automatic circuit breaking of the resistor is realized, and other elements on the circuit are protected; when the electric resistance wire cutting machine works, after the current passing through the resistor is abnormal, the resistor can generate a large amount of heat, when the heat generated by the resistor is insufficient to fuse the resistance wire, the resistor can continuously work, at the moment, the separation stop block made of polytetrafluoroethylene can be melted firstly, the hard alloy blade falls under the elastic action of the spring, the cutter head is symmetrically hinged on the cutter rod, the cutter head can be opened under the action of the pressure applied by the spring, so that extrusion force is generated on the resistance wire, the transverse tearing force borne by the resistance wire is increased, the resistance wire can be cut off more easily, the power-off of the resistor is realized, and after the resistance wire is cut off, the end part of the resistance wire is clamped into the sponge block, so that the limitation on the end part position of the resistance wire is realized, the short circuit phenomenon formed after the resistance wire is cut off and is contacted with other resistance wires is effectively prevented, the safety of the resistor in the use process is improved.

Preferably, a sliding groove is formed in the side wall of the tool bit and close to the sponge block, one end of the sliding groove is close to the resistance wire, and the other end of the sliding groove is communicated with the sponge block; through the matching of the sponge block and the sliding groove, after the resistance wire is cut off, the end part of the resistance wire can slide to the sponge block along the sliding groove, and the position of the end part of the resistance wire is further limited; the during operation, after separating the dog and melting, the carbide blade is at the spring action whereabouts of spring, because the tool bit symmetry articulates on the cutter arbor, make the tool bit can produce the extrusion force to the resistance wire under the pressure effect that the spring was exerted, increase the horizontal power of tearing that the resistance wire received, thereby make the resistance wire can be more easily cut off, realize the outage of resistor, after the resistance wire is cut off, the resistance wire tip can insert in the sponge piece along the spout, thereby the accuracy that the resistance wire tip inserted the sponge piece has been guaranteed, further strengthen the fixed to the resistance wire position, effectively strengthened the resistance wire by the circuit safety problem that the back caused of cutting off, strengthen holistic result of use and the practicality of resistor, thereby improve the factor of safety in the resistor use.

Preferably, one of the two cutter heads is provided with a first groove on the side wall which is contacted with the other cutter head; an elastic sheet is arranged in the first groove; when the cutter head is opened through the matching of the elastic sheet and the first groove, the elastic sheet can be popped out from the first groove, so that the position limiting effect between the two cutter heads is enhanced; when the cutter is in operation, when the hard alloy blade falls under the elastic force of the spring, the cutter head is symmetrically hinged on the cutter bar, so that the cutter head can be opened under the pressure applied by the spring, the extrusion force is generated on the resistance wire, the transverse tearing force borne by the resistance wire is increased, and the resistance wire can be cut off more easily; when the tool bit was opened under the effect of pressure, the shell fragment popped out from a groove under the effect of self elasticity to form the holding power between two tool bits, effectively prevent the reset condition after the tool bit became invalid in the later stage, thereby further guarantee that the resistance wire can not reconnect after being cut off, thereby effectively protected the device in the circuit.

Preferably, the side wall of the cutter head opposite to the first groove is provided with a film bag; the film bag is filled with quicksand; through the cooperation of the elastic sheet, the film bag and the quicksand, the end part of the resistance wire can be insulated after the resistance wire is cut off, so that safety accidents are prevented; the during operation, when the tool bit is opened under the effect of pressure, the shell fragment pops out from a groove under the effect of self elasticity, at the pop-up in-process of shell fragment, the shell fragment tip can produce the extrusion to the film bag, thereby crush the film bag, make the quicksand in the film bag flow out, cover out the part that is close to the resistance wire by the cutting off, thereby realized effectively blocking of resistor circuit, further prevent that the resistance wire from being cut off the back still cause the circumstances of circuit circular telegram, thereby further improved the protective effect to other elements on the circuit, strengthen the whole result of use of resistor.

Preferably, the side wall of the cutter head, which is in contact with the cutter body, is provided with a second groove; a first magnet and a second magnet are arranged in the second groove, and mutual attraction exists between the first magnet and the second magnet; the cutting force of the cutter head to the resistance wire is increased through the matching of the first magnet and the second magnet, and the failure resetting condition of the cutter head is effectively prevented; the during operation, when the carbide blade is in the elastic force effect whereabouts of spring, because the tool bit symmetry articulates on the cutter arbor, make the tool bit can open under the pressure effect that the spring was exerted, at the in-process that the tool bit was opened, because there is mutual appeal between a magnet and No. two magnets, make a magnet and No. two magnets take place the slip that is close to relatively in No. two inslots, thereby strengthen the power of opening and shutting between the tool bit, increase the cutter bit is to the cutting force of resistance wire, in addition after a magnet and No. two magnets are close to each other, a magnet and No. two magnets can produce the extrusion force to the tool bit, thereby can effectively prevent the inefficacy circumstances of reseing of tool bit, strengthen the whole result of use and the practicality of resistor.

The invention has the following beneficial effects:

1. according to the fuse resistor, the resistor body, the resistance wire and the circuit breaking unit are matched, so that when the temperature of the resistor rises due to abnormal current, the resistor can be automatically broken, other devices are prevented from being burnt out after the resistor works continuously, the use safety of the resistor is improved, the safety sensitivity of the resistor is improved, and the probability of dangerous accidents in the use process of the resistor is reduced.

2. According to the fuse resistor, the cutting force of the cutter head on the resistance wire is increased through the matching of the first magnet and the second magnet, the fact that the resistor can be powered off in time when abnormal current passes through the resistor is guaranteed, the failure reset condition of the cutter head can be effectively prevented after the resistance wire is cut off by the cutter head, the resistance wire is prevented from being reconnected after the cutter head is combined, and therefore the overall using effect and the practicability of the resistor are enhanced.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of a cemented carbide insert according to the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

in the figure: the resistance body 1, the resistance wire 2, the circuit breaking unit 3, the blocking piece 31, the V-shaped groove 311, the support 32, the hard alloy blade 33, the cutter bar 331, the cutter head 332, the first groove 333, the elastic sheet 334, the film bag 335, the sponge block 34, the sliding groove 35, the second groove 36, the first magnet 361 and the second magnet 362.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 3, the fuse resistor of the present invention includes a resistor body 1, a resistance wire 2 and a breaking unit 3; the resistance wire 2 is wound on the resistor body 1; the circuit breaking unit 3 comprises a separation stop block 31, a bracket 32 and a hard alloy blade 33; the separation block 31 is arranged on the resistance wire 2, the material of the separation block 31 is polytetrafluoroethylene, and a V-shaped groove 311 is formed in the separation block 31; the bracket 32 is arranged at the position of the resistor body 1 close to the spacing block 31; the hard alloy blade 33 is arranged on the bracket 32 through a spring, an insulating layer is coated on the surface of the hard alloy blade 33, the hard alloy blade 33 comprises a cutter bar 331 and a cutter head 332, and the cutter head 332 is clamped into the V-shaped groove 311 under the elastic force action of the spring; the resistor body 1, the resistance wire 2 and the circuit breaking unit 3 are matched to realize automatic circuit breaking of the resistor when the temperature of the resistor is increased due to current abnormity; during operation, when the resistor is in normal operating condition, carbide blade 33 contacts with separating the dog 31 under the spring force effect of spring, and make tool bit 332 block in V-arrangement groove 311, after the current through the resistor is unusual, the resistor can produce a large amount of heats, when the heat that the resistor produced is not enough to let resistance wire 2 fuse, the resistor can continue to work, the material is polytetrafluoroethylene's separating dog 31 can melt earlier this moment, then carbide blade 33 falls at the spring force effect of spring, thereby cut off resistance wire 2, after resistance wire 2 is cut off, realize the outage of resistor, avoid the resistor to burn other devices after continuing to work, thereby improve the safety in utilization of resistor, improve the safety and sensitivity of resistor.

As an embodiment of the present invention, the cutter heads 332 are symmetrically hinged on the cutter bar 331, so that when the blocking block 31 is not melted, the two cutter heads 332 are in a combined state, and when the blocking block 31 is melted, the two cutter heads 332 are opened under the pressure of the cutter bar 331; the outer side wall of the tool bit 332 close to the resistance wire 2 is provided with a sponge block 34; the resistance wire 2 is cut off and clamped into the sponge block 34 through the matching of the tool bit 332 and the sponge block 34, so that the automatic circuit breaking of the resistor is realized, and other elements on the circuit are protected; when the electric heating wire cutting device works, after the current passing through the resistor is abnormal, the resistor can generate a large amount of heat, when the heat generated by the resistor is not enough to fuse the resistance wire 2, the resistor can continuously work, at the moment, the blocking block 31 made of polytetrafluoroethylene melts firstly, the hard alloy blade 33 falls under the elastic action of the spring, the tool bit 332 is symmetrically hinged on the tool bar 331, the tool bit 332 can be opened under the action of the pressure exerted by the spring, so that the extrusion force is generated on the resistance wire 2, the transverse tearing force borne by the resistance wire 2 is increased, the resistance wire 2 can be cut off more easily, the power-off of the resistor is realized, after the resistance wire 2 is cut off, the end part of the resistance wire 2 is clamped into the sponge block 34, the limitation on the end part position of the resistance wire 2 is realized, and the short-circuit phenomenon caused by the contact between the resistance wire 2 and, therefore, the sponge block 34 can effectively avoid the occurrence of circuit safety accidents and improve the safety of the resistor in the using process.

As an embodiment of the invention, the side wall of the tool bit 332 is provided with a sliding groove 35 at a position close to the sponge block 34, and one end of the sliding groove 35 is close to the resistance wire 2, and the other end is communicated with the sponge block 34; through the matching of the sponge block 34 and the sliding groove 35, after the resistance wire 2 is cut off, the end part of the resistance wire 2 can slide to the sponge block 34 along the sliding groove 35, and the position of the end part of the resistance wire 2 is further limited; the during operation, after separating dog 31 and melting, carbide blade 33 is at the spring action whereabouts of spring, because tool bit 332 symmetry articulates on cutter arbor 331, make tool bit 332 can produce the extrusion force to resistance wire 2 under the pressure effect that the spring was exerted, increase the horizontal power of tearing that resistance wire 2 received, thereby make resistance wire 2 can be more easily cut off, realize the outage of resistor, after resistance wire 2 is cut off, 2 tip of resistance wire can insert sponge piece 34 along spout 35 in, thereby guaranteed 2 tip of resistance wire and inserted the accuracy of sponge piece 34, further strengthen the fixed to 2 positions of resistance wire, effectively strengthened resistance wire 2 circuit safety problem caused after being cut off, strengthen the holistic result of use and the practicality of resistor, thereby improve the factor of safety in the resistor use.

As an embodiment of the present invention, one of the two tool bits 332 is provided with a number one groove 333 on the side walls contacting each other; an elastic sheet 334 is arranged in the first groove 333; when the cutter head 332 is opened through the matching of the elastic sheet 334 and the first groove 333, the elastic sheet 334 can be ejected out of the first groove 333, and the position limiting effect between the two cutter heads 332 is enhanced; when the hard alloy blade 33 falls under the elastic force of the spring, the cutter head 332 is symmetrically hinged on the cutter bar 331, so that the cutter head 332 can be opened under the pressure applied by the spring, extrusion force is generated on the resistance wire 2, the transverse tearing force borne by the resistance wire 2 is increased, and the resistance wire 2 can be cut off more easily; when the tool bit 332 is opened under the action of pressure, the elastic sheet 334 is popped out from the first groove 333 under the action of self elastic force, so that supporting force is formed between the two tool bits 332, the reset condition of the tool bit 332 after failure in the later period is effectively prevented, the resistance wire 2 is further ensured not to be connected again after being cut off, and devices in a circuit are effectively protected.

As an embodiment of the present invention, the cutting head 332 is provided with a thin film capsule 335 on the side wall opposite to the first groove 333; the film bag 335 is filled with quicksand; through the cooperation of the elastic sheet 334, the film bag 335 and the quicksand, the end part of the resistance wire 2 can be insulated after the resistance wire 2 is cut off, so that safety accidents are prevented; the during operation, when tool bit 332 is opened under the effect of pressure, shell fragment 334 pops out from a groove 333 under the effect of self elasticity, at the pop-up in-process of shell fragment 334, shell fragment 334 tip can produce the extrusion to film bag 335, thereby crush film bag 335, make the interior quicksand of film bag 335 flow out, cover out resistance wire 2 is close to the part of being cut off, thereby realized effectively blocking of resistor circuit, further prevent that resistance wire 2 from being cut off the back still cause the circumstances of circuit circular telegram, thereby further improved the protection effect to other components in the circuit, the whole result of use of reinforcing resistor.

As an embodiment of the present invention, the tool bit 332 has a second groove 36 on a side wall contacting with the tool body; a first magnet 361 and a second magnet 362 are arranged in the second groove 36, and mutual attraction exists between the first magnet 361 and the second magnet 362; the cutting force of the cutter head 332 on the resistance wire 2 is increased through the matching of the first magnet 361 and the second magnet 362, and the failure resetting condition of the cutter head 332 is effectively prevented; when the hard alloy blade 33 falls under the elastic force of the spring, the cutter head 332 is symmetrically hinged to the cutter bar 331, so that the cutter head 332 can be opened under the pressure applied by the spring, in the process of opening the cutter head 332, the first magnet 361 and the second magnet 362 slide relatively close to each other in the second groove 36 due to the mutual attraction between the first magnet 361 and the second magnet 362, the opening and closing force between the cutter heads 332 is enhanced, the cutting force of the cutter head 332 on the resistance wire 2 is increased, in addition, after the first magnet 361 and the second magnet 362 are close to each other, the first magnet 361 and the second magnet 362 can generate extrusion force on the cutter head 332, the failure resetting condition of the cutter head 332 can be effectively prevented, and the whole using effect and the practicability of the resistor are enhanced.

When the resistor works, when the resistor is in a normal working state, the hard alloy blade 33 is in contact with the blocking block 31 under the elastic force of the spring, the cutter head 332 is clamped in the V-shaped groove 311, when the current passing through the resistor is abnormal, the resistor can generate a large amount of heat, when the heat generated by the resistor is not enough to fuse the resistance wire 2, the resistor can continuously work, at the moment, the blocking block 31 made of polytetrafluoroethylene is firstly melted, the hard alloy blade 33 falls under the elastic force of the spring to cut off the resistance wire 2, and after the resistance wire 2 is cut off, the power-off of the resistor is realized, so that other devices are prevented from being burnt out after the resistor continuously works, the use safety of the resistor is improved, and the safety and sensitivity of the resistor are improved; after the current passing through the resistor is abnormal, the resistor can generate a large amount of heat, when the heat generated by the resistor is not enough to fuse the resistance wire 2, the resistor can continuously work, at the moment, the blocking block 31 made of polytetrafluoroethylene can be melted firstly, the hard alloy blade 33 falls under the elastic action of the spring, the cutter head 332 is symmetrically hinged on the cutter bar 331, the cutter head 332 can be opened under the action of the pressure applied by the spring, so that extrusion force is generated on the resistance wire 2, the transverse tearing force borne by the resistance wire 2 is increased, the resistance wire 2 can be cut off more easily, the power-off of the resistor is realized, and after the resistance wire 2 is cut off, the end part of the resistance wire 2 is clamped into the sponge block 34, so that the limitation on the end part position of the resistance wire 2 is realized, and the short circuit phenomenon formed after the resistance wire 2 is cut off and is contacted with, the sponge block 34 can effectively avoid the occurrence of circuit safety accidents and improve the safety of the resistor in the using process; after the blocking block 31 is melted, the hard alloy blade 33 falls under the elastic force of the spring, and the tool bit 332 is symmetrically hinged to the tool bar 331, so that the tool bit 332 can generate extrusion force on the resistance wire 2 under the action of pressure applied by the spring, and the transverse tearing force on the resistance wire 2 is increased, so that the resistance wire 2 can be cut off more easily, and the power failure of the resistor is realized; when the hard alloy blade 33 falls under the elastic force of the spring, the cutter head 332 is symmetrically hinged on the cutter bar 331, so that the cutter head 332 can be opened under the pressure applied by the spring, extrusion force is generated on the resistance wire 2, the transverse tearing force borne by the resistance wire 2 is increased, and the resistance wire 2 can be cut off more easily; when the cutter heads 332 are opened under the action of pressure, the elastic sheets 334 are ejected from the first grooves 333 under the action of self elasticity, so that supporting force is formed between the two cutter heads 332, the reset condition of the cutter heads 332 after failure in the later period is effectively prevented, the resistance wire 2 is further prevented from being reconnected after being cut off, and devices in the circuit are effectively protected; when the tool bit 332 is opened under the action of pressure, the elastic sheet 334 is ejected from the first groove 333 under the action of self elasticity, in the ejection process of the elastic sheet 334, the end part of the elastic sheet 334 can extrude the film bag 335, so that the film bag 335 is crushed, flowing sand in the film bag 335 flows out, and the part of the resistance wire 2 close to the cut-off part is covered, so that the effective blocking of the circuit of the resistor is realized, the condition that the circuit is electrified after the resistance wire 2 is cut off is further prevented, the protection effect on other elements on the circuit is further improved, and the integral use effect of the resistor is enhanced; when the carbide blade 33 falls under the elastic force of the spring, the cutter head 332 is symmetrically hinged to the cutter bar 331, so that the cutter head 332 can be opened under the pressure applied by the spring, in the process of opening the cutter head 332, the first magnet 361 and the second magnet 362 slide relatively close to each other in the second groove 36 due to the mutual attraction between the first magnet 361 and the second magnet 362, so that the opening and closing force between the cutter heads 332 is enhanced, the cutting force of the cutter head 332 on the resistance wire 2 is increased, and in addition, after the first magnet 361 and the second magnet 362 approach to each other, the first magnet 361 and the second magnet 362 can generate extrusion force on the cutter head 332, so that the failure resetting condition of the cutter head 332 can be effectively prevented, and the whole using effect and the practicability of the resistor are enhanced.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A fuse resistor, characterized by: comprises a resistor body (1), a resistance wire (2) and a breaking unit (3); the resistance wire (2) is wound on the resistance body (1); the circuit breaking unit (3) comprises a separation stop block (31), a bracket (32) and a hard alloy blade (33); the separation block (31) is arranged on the resistance wire (2), the separation block (31) is made of polytetrafluoroethylene, and a V-shaped groove (311) is formed in the separation block (31); the bracket (32) is arranged at the position of the resistor body (1) close to the spacing block (31); the hard alloy blade (33) is mounted on the support (32) through a spring, an insulating layer is coated on the surface of the hard alloy blade (33), the hard alloy blade (33) comprises a cutter bar (331) and a cutter head (332), and the cutter head (332) is clamped into the V-shaped groove (311) under the elastic force action of the spring; the resistor body (1), the resistance wire (2) and the circuit breaking unit (3) are matched to realize automatic circuit breaking of the resistor when the temperature of the resistor is increased due to current abnormity.

2. A fuse resistor according to claim 1 wherein: the cutter heads (332) are symmetrically hinged on the cutter bar (331), so that when the separation block (31) is not melted, the two cutter heads (332) are in a combined state, and when the separation block (31) is melted, the two cutter heads (332) can be opened under the pressure of the cutter bar (331); the outer side wall of the cutter head (332), which is close to the resistance wire (2), is provided with a sponge block (34); the resistance wire (2) is cut off and clamped into the sponge block (34) through the matching of the cutter head (332) and the sponge block (34), so that the automatic circuit breaking of the resistor is realized, and other elements on a circuit are protected.

3. A fuse resistor according to claim 2 wherein: a sliding groove (35) is formed in the side wall of the tool bit (332) and is close to the sponge block (34), one end of the sliding groove (35) is close to the resistance wire (2), and the other end of the sliding groove (35) is communicated with the sponge block (34); through the matching of the sponge block (34) and the sliding groove (35), when the resistance wire (2) is cut off, the end part of the resistance wire (2) can slide to the position of the sponge block (34) along the sliding groove (35), and the position of the end part of the resistance wire (2) is further limited.

4. A fuse resistor according to claim 3 wherein: one of the two cutter heads (332) is provided with a first groove (333) on the side walls which are contacted with each other; an elastic sheet (334) is arranged in the first groove (333); through the cooperation of the elastic sheet (334) and the first groove (333), when the cutter head (332) is opened, the elastic sheet (334) can be ejected out of the first groove (333), and the position limiting effect between the two cutter heads (332) is strengthened.

5. A fuse resistor according to claim 4 wherein: the cutter head (332) is provided with a film bag (335) on the side wall opposite to the first groove (333); the film bag (335) is filled with quicksand; through the cooperation of the elastic sheet (334), the film bag (335) and the quicksand, the end part of the resistance wire (2) can be subjected to insulation treatment after the resistance wire (2) is cut off, and safety accidents are prevented.

6. A fuse resistor according to claim 5 wherein: the side wall of the cutter head (332) in contact with the cutter body is provided with a second groove (36); a first magnet (361) and a second magnet (362) are arranged in the second groove (36), and mutual attraction force exists between the first magnet (361) and the second magnet (362); the cutting force of the cutter head (332) to the resistance wire (2) is increased through the matching of the first magnet (361) and the second magnet (362), and the failure resetting condition of the cutter head (332) is effectively prevented.