CN213212068U

CN213212068U - Auxiliary terminal structure for relay

Info

Publication number: CN213212068U
Application number: CN202021909679.3U
Authority: CN
Inventors: 王亚宾; 杨昌; 张井超; 唐俊平
Original assignee: Sanyou Corp Ltd; Tianjin Aviation Mechanical and Electrical Co Ltd
Current assignee: Sanyou Corp Ltd; Tianjin Aviation Mechanical and Electrical Co Ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2021-05-14
Anticipated expiration: 2030-09-03

Abstract

The invention relates to the technical field of relays, in particular to an auxiliary terminal structure for a relay, which comprises a relay body, two static contact bridges, a movable contact bridge, a driving shaft, a driving mechanism and at least one auxiliary terminal assembly, wherein the auxiliary terminal assembly comprises two auxiliary terminals, an insulating seat, an auxiliary movable contact piece, an auxiliary static contact piece and an insulating clamping piece; the movable contact and the fixed contact are arranged at intervals in the height direction, the driving shaft is sleeved with an insulating clamping piece, and the end part of the auxiliary movable contact, provided with the movable contact, extends towards the insulating clamping piece and is clamped and matched with the insulating clamping piece; compared with the prior art, the fixing mode that the auxiliary moving contact piece is fixed on the driving shaft in the prior art is replaced, the load of the driving shaft is reduced, and the problem that the auxiliary moving contact piece falls off from the driving shaft is solved.

Description

Auxiliary terminal structure for relay

Technical Field

The invention relates to the technical field of relays, in particular to an auxiliary terminal structure for a relay.

Background

In order to monitor the problem of failure of the relay caused by the fact that a movable contact bridge is not conducted when the relay is conducted or the movable contact bridge is still attracted to a fixed contact bridge when the movable contact bridge is separated, a group of auxiliary terminal assemblies are usually added to the conventional relay, and the fault is rapidly detected through an auxiliary detection circuit externally connected with the auxiliary terminal assemblies.

The existing auxiliary terminal assembly comprises an auxiliary movable contact piece and an auxiliary static contact piece, wherein the auxiliary static contact piece is generally fixed in an arc extinguishing cavity, the auxiliary movable contact piece is fixedly arranged on a driving shaft, and the auxiliary movable contact piece are respectively connected with an auxiliary terminal used for being connected with an external detection line. In practical application, when the driving shaft drives the movable contact bridge and the static contact bridge to be sucked, the auxiliary movable contact piece on the driving shaft can move towards the auxiliary static contact piece, when the auxiliary static contact piece is contacted with the auxiliary movable contact piece, an external auxiliary detection circuit forms a loop through the auxiliary terminal, the auxiliary static contact and the auxiliary movable contact, and therefore the relay is detected. In order to avoid the conduction between the auxiliary movable contact piece and the driving shaft, the auxiliary movable contact piece and the driving shaft are generally provided with insulating pieces to separate and insulate the auxiliary movable contact piece and the driving shaft, the mode of fixing the auxiliary movable contact piece can increase the load of the driving shaft and is not beneficial to the control of the driving shaft, in addition, under the frequent opening and closing application, the auxiliary movable contact piece can be loosened relative to the driving shaft, once the auxiliary movable contact piece is loosened, the detection function can not be normally carried out, the connection strength is poor, the normal work of the relay is influenced, and safety accidents are easy to generate.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide an auxiliary terminal structure for a relay, which can solve the problem of unstable operation of an auxiliary terminal assembly.

The purpose of the invention is realized by the following technical scheme:

the auxiliary terminal structure for the relay comprises a relay body, a driving mechanism, a movable contact bridge, a driving shaft and two static contact bridges; the two static contact bridges are fixedly arranged on the relay body; the auxiliary terminal structure for the relay further comprises an insulating clamping piece, an insulating seat, an auxiliary movable contact piece, an auxiliary static contact piece and two auxiliary terminals, wherein the insulating seat is fixed inside the relay body; the movable contact and the stationary contact are arranged at intervals in the height direction, the driving shaft is sleeved with an insulating clamping piece, the peripheral side of the insulating clamping piece extends out of the clamping block, and the end part of the auxiliary movable contact extends towards the clamping block and is arranged on the peripheral side of the clamping block in a winding mode.

Wherein, the clamping block is arranged in a straight strip shape.

Wherein, the clamping block is provided with a plurality of through holes.

The end of the auxiliary moving contact piece is turned over back to the length direction of the auxiliary moving contact piece to form a turning part clung to the auxiliary moving contact piece, a clamping head is formed at one end of the auxiliary moving contact piece, and a mounting hole penetrating through the turning part is formed at the other end of the auxiliary moving contact piece.

Wherein, the folding part is tightly attached to the auxiliary movable contact piece through the patting processing.

The auxiliary movable contact piece is provided with a plurality of positioning holes for positioning, and convex rings are formed on the upward positioning holes.

Wherein, the convex ring of the positioning hole is formed on the auxiliary movable contact piece through flanging processing.

The clamping head comprises a first clamping piece and a second clamping piece, the first clamping piece and the second clamping piece are used for clamping signal end portions, the first clamping piece and the second clamping piece are arranged in a vertical V shape, one end of the first clamping piece is fixedly connected with the auxiliary movable contact piece, the other end of the first clamping piece is fixedly connected with one end of the second clamping piece, the other end of the second clamping piece is bent upwards in an inclined mode to form a second clamping portion, and the joint of the first clamping piece and the auxiliary movable contact piece is bent downwards in an inclined mode to form the first clamping portion.

The application discloses work process of auxiliary terminal structure for relay does: the relay is electrified, the driving mechanism pushes the driving shaft to move upwards, the movable contact bridge and the static contact bridge are attracted, and the relay is in an electrified state; in the process of moving the driving shaft upwards, the insulating clamping piece sleeved on the driving shaft moves upwards along with the driving shaft, and when the insulating clamping piece moves upwards, the top end part of the clamping block abuts against the auxiliary movable contact piece, so that the movable contact of the auxiliary movable contact piece is communicated with the static contact of the auxiliary static contact piece to form an auxiliary detection loop. When the main contact assembly is disconnected, the auxiliary terminal assembly can be disconnected at the same time, and the working stability of the relay is enhanced;

compared with the prior art, replaced the fixed mode that supplementary movable contact spring was fixed in the drive shaft in the past, reduced the load of drive shaft, solved the problem that supplementary movable contact spring drops from the drive shaft, strengthened the mounting structure intensity of supplementary movable contact spring and supplementary static contact, further strengthened the job stabilization nature of relay.

Drawings

The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a relay in the embodiment.

Fig. 2 is an exploded view of the relay in the embodiment.

Fig. 3 is a sectional view of the relay in the embodiment.

FIG. 4 is a schematic structural diagram of a static bridge in the embodiment.

Fig. 5 is an exploded view of the static bridge in the embodiment.

Fig. 6 is an exploded view of a relay body in the embodiment.

Fig. 7 is a plan view of a relay body in the embodiment.

Fig. 8 is a cross-sectional view taken at a-a in fig. 7.

Fig. 9 is an exploded view of the relay body in the embodiment after hiding the ceramic case.

Fig. 10 is a schematic structural diagram of an auxiliary moving contact piece in the embodiment.

Fig. 11 is a cross-sectional view of the hidden ceramic shell at B-B in fig. 7.

Fig. 12 is a cross-sectional view at C-C in fig. 7.

Fig. 13 is a schematic structural diagram of a relay and a controller in the embodiment.

Fig. 14 is an exploded view of the relay and controller in the embodiment.

Fig. 15 is a schematic structural view of an insulating holder in the embodiment.

Reference numerals: the relay comprises a relay body 100, a ceramic shell 11, a connecting table 12, a magnetic circuit shell 13, a coil 131, a supporting plate 132, a housing 1, a static contact bridge 2, a movable contact bridge 20, a stainless steel column 21, a copper base 22, a static contact portion 23, a clamping groove 24, an external terminal 3, a PCB 4, a magnetic conduction frame 5, a conductive wire 6, an auxiliary terminal 7, a mounting hole 71, a copper bush 72, a clamping ring 8, an insulating seat 81, a convex column 811, an auxiliary movable contact 82, a movable contact 821, an auxiliary static contact 83, a static contact 831, a clamping block 94, a driving shaft 91, an insulating clamping piece 92, a retaining ring 921, a through hole 401, a folded portion 411, a positioning hole 422, a convex ring 421, a first clamping piece 441, a second clamping piece 442, a first clamping portion 451, a second clamping portion 452, a controller 200, a connecting plate 201, a first countersunk hole 211 and a second countersunk hole 212.

Detailed Description

The invention is further described with reference to the following examples.

Referring to fig. 1 and 2, the relay includes a housing 1, a PCB 4, a flux guide 5, and a relay body 100. The top portion of relay body 100 is equipped with a pair of stationary contact bridge 2 that stretches out to shell 1 top, and the welding has the external terminal 3 that is used for external on the PCB board 4, and external terminal 3 also wears out shell 1. The PCB 4 is provided with a through hole for the static contact bridge 2 to pass through, the PCB 4 is fixedly installed on the outer peripheral side of the static contact bridge 2, the distances between the static contact bridge 2 and the PCB 4 and between the relay body 100 and the PCB 4 can be effectively shortened, the length required by a wire is reduced, and the resistance of the wire is reduced.

Referring to fig. 2, a magnetic frame 5 is disposed between the relay body 100 and the PCB 4, and the magnetic frame 5 covers the top end of the relay body 100, so as to separate the PCB 4 from the relay body 100. The permanent magnets are arranged on two sides inside the magnetic conduction frame 5, so that a magnetic field is generated, when the static contact part 23 is cut off (separated from the movable contact component), electric arcs are generated along with the magnetic field, the magnetic field can effectively control the electric arcs, and interference caused by other factors on signal transmission of the PCB 4 is effectively avoided.

In this embodiment, the PCB 4 is further welded with a conventional analog voltage acquisition module (not shown), an input end of the voltage acquisition module is connected with the static contact bridge 2 through a conductive wire 6, an output end of the voltage acquisition module is connected to an input end of the external terminal 3 through the PCB 4, and an external electronic component such as a controller 200 can be connected with the external terminal 3 in a pluggable manner to acquire the relay voltage. Through setting up PCB board 4 that has voltage acquisition module, conductor wire 6 is connected static contact bridge 2 and PCB board 4 to voltage acquisition module can gather the voltage of static contact bridge 2, and then outside electronic equipment is connected with external terminal 3, acquires data display from voltage acquisition module through PCB board 4, has solved the problem that needs the manual work to carry out the collection in the past, has reduced staff's intensity of labour, has improved work efficiency.

Referring to fig. 3 to 5, in order to facilitate the connection between the static contact bridge 2 and the conductive wire 6, a retaining ring with an opening is sleeved on the outer peripheral side of the static contact bridge 2, one end of the conductive wire 6 is welded to the PCB 4, and the other end of the conductive wire 6 is clamped on the static contact bridge 2 by the retaining ring. The electric lead 6 is electrically connected with the static contact bridge 2 by clamping the clamping ring, so that the former welding connection mode is replaced, the labor intensity of workers is further reduced, and the working efficiency is further improved. In order to further enhance the connection strength between the conductive wire 6 and the static contact bridge 2, please refer to fig. 5, a circle of clamping grooves 24 is arranged on the outer side surface of the static contact bridge 2, and in an assembled state, the clamping ring is inserted into the clamping grooves 24.

In this embodiment, please see fig. 3 to 5, the static contact bridge 2 includes a copper base 22 and a stainless steel rod, the copper base 22 is used for contacting the conductive wire 6, a static contact portion 23 extends downward from the bottom surface of the copper base 22, the copper base 22 is clamped in the relay body 100, the stainless steel rod extends out of the relay as the working end of the structure of the static contact bridge 2, and the static contact portion 23 is used as the static contact component of the relay to cooperate with the movable contact component to realize the closing and opening of the relay.

As a modification, referring to fig. 3 to 5, a threaded hole is formed in the top surface of the copper base 22, and in an assembled state, the stainless steel rod is inserted into and fixed in the threaded hole of the copper base 22. The copper base 22 is made of pure copper, and the stainless steel rod is made of stainless steel material. The stainless steel pole adopts stainless steel material preparation to form as the work end of static bridge 2, and the yield strength of stainless steel will be higher than copper, has solved in the past the problem that the work end of static bridge 2 takes place to warp under high temperature environment, has strengthened the structural strength of static bridge 2, has further improved the stability and the security of relay work.

In this embodiment, in order to ensure the connection strength and the conductivity of the stainless steel rod and the copper base 22, an internal thread is provided in the threaded hole, and an external thread matching and screwing with the internal thread is provided on the outer peripheral side of one end of the stainless steel rod. The fixing mode of adopting threaded connection is convenient for dismouting and maintenance, makes overall structure more firm and compact, and as preferred scheme, the stainless steel pole can adopt the hexagon socket head cap screw to replace.

Referring to fig. 6 to 8, the relay body 100 includes a ceramic case 11, a connection stage 12, and a magnetic circuit case 13, a coil 131 is provided in the magnetic circuit case 13, and a support plate 132 is provided on the top of the magnetic circuit case 13 to space the coil 131 from the ceramic case 11. Two static contact bridges 2, a movable contact bridge 20, a driving shaft 91 and a driving mechanism are arranged in the relay body 100. Two static contact bridges 2 are fixedly arranged on the relay body 100, the driving shaft 91 is arranged in the relay body 100, the movable contact bridge 20 is arranged at the upper end of the driving shaft 91 through an insulating part, the installation modes and principles of the static contact bridge 2, the driving shaft 91 and the movable contact bridge 20 are the same as those of the existing relay, and a person skilled in the art can easily know the working principle and the motion process among the three.

Referring to fig. 8 to 9, the auxiliary terminal structure for a relay further includes two auxiliary terminal assemblies, each of the auxiliary terminal assemblies includes two auxiliary terminals (terminals), an insulating base 81, an auxiliary movable contact 82, an auxiliary stationary contact 83, and an insulating holding member 92, and the insulating base 81 is fixed inside the relay body 100. The two auxiliary terminals are inserted into the relay body 100 and are respectively and fixedly connected with one end of the auxiliary movable contact piece 82 and one end of the auxiliary static contact piece 83, and the movable contact 821 and the static contact 831 are respectively and fixedly installed at the other end of the auxiliary movable contact piece 82 and the other end of the auxiliary static contact piece 83.

The auxiliary moving contact 82 or the auxiliary static contact 83 is detachably mounted on the insulating base 81, and referring to fig. 9, specifically, a hole is formed in the insulating base 2, and then one end of the auxiliary moving contact 82 or the auxiliary static contact 83 is clamped in the hole.

In the present embodiment, referring to fig. 10, taking a schematic structural view of the auxiliary moving contact 82 as an example for description, the end portion of the auxiliary moving contact 82 wound on the holding block 94 may be formed by bending. One end of the auxiliary moving contact piece 82 or the auxiliary static contact piece 83 is formed with a collet, and the other end of the auxiliary moving contact piece 82 or the auxiliary static contact piece 83 is provided with a through hole 401. The through-hole 401 is used to mount the movable contact 821 or the stationary contact 831.

In addition, referring to fig. 9 and 10, the auxiliary moving contact 82 or the auxiliary static contact 83 is bent downward at both sides to form a clip, and is fixedly mounted on the insulating base 2 through the clip. A clamping head is arranged at one end part of the auxiliary moving contact piece 82 or the auxiliary static contact piece 83, the clamping head comprises a first clamping piece 441 and a second clamping piece 442 which are used for clamping the signal end part, the first clamping piece 441 and the second clamping piece 442 are arranged in a vertical V shape, one end of the first clamping piece 441 is fixedly connected with the auxiliary moving contact piece 82 or the auxiliary static contact piece 83, the other end of the first clamping piece 441 is fixedly connected with one end of the second clamping piece 442, the other end of the second clamping piece 442 is bent upwards in an inclined mode to form a second clamping part 452, and the joint of the first clamping piece 441 and the auxiliary moving contact piece 82 or the auxiliary static contact piece 83 is bent downwards in an inclined mode to form a first. The first clamping portion 451 and the second clamping portion 452 cooperate to form an elastic clamping mechanism, which can firmly clamp and conduct the signal terminals.

As a modification, referring to fig. 8 to 11, the movable contact 821 and the fixed contact 831 are spaced apart in the height direction, that is, the installation plane of the auxiliary movable contact 821 is offset from the installation plane of the auxiliary fixed contact 831 in the height direction. The driving shaft 91 is sleeved with an insulating clamping member 92.

Referring to fig. 11 and 15, a holding block 94 extends from an outer peripheral side of the insulating holder 92, and an end of the auxiliary movable contact 82 extends toward the insulating holder and surrounds the outer peripheral side of the holding block 94. In the present embodiment, the holding block 94 is elongated, so that the insulating holding member 92 has a similar structure to the moving contact bridge 20, which facilitates the manufacturing and reduces the manufacturing cost. Referring to fig. 15, the auxiliary movable contact piece 82 and the auxiliary stationary contact piece 83 in this embodiment are both fixedly mounted on the insulating base 81, and the end of the auxiliary movable contact piece 82 is wound around the outer peripheral side of the holding block 94. In order to reduce the weight of the chucking block 94, reduce the load of the driving shaft 91,

the relay is electrified, the driving mechanism pushes the driving shaft 91 to move upwards, the movable contact bridge 20 and the static contact bridge 2 are attracted, and the relay is in an electrified state; in the process that the driving shaft 91 moves upwards, the insulating clamping piece sleeved on the driving shaft 91 moves upwards along with the driving shaft 91, when the insulating clamping piece moves upwards, the top end part of the clamping block 94 abuts against the auxiliary movable contact 82, so that the movable contact 821 of the auxiliary movable contact 82 is communicated with the fixed contact 831 of the auxiliary fixed contact 83 to form an auxiliary detection loop. When the electrical apparatus is disconnected, the magnetic force disappears, the driving shaft 91 is reset under the driving of the spring, the driving shaft 91 drives the clamping block 94 to move downwards together in the resetting moving process, the bottom end face of the clamping block 94 presses the auxiliary movable contact 82 downwards so as to force the auxiliary movable contact 82 to be separated from the auxiliary static contact 83, and therefore when the main contact assembly is disconnected, the auxiliary terminal assembly can be disconnected at the same time, and the working stability of the relay is enhanced. Compared with the prior art, the fixing mode that the auxiliary movable contact piece 82 is fixed on the driving shaft 91 in the prior art is replaced, the load of the driving shaft 91 is reduced, the problem that the auxiliary movable contact piece 82 falls off from the driving shaft 91 is solved, the mounting structural strength of the auxiliary movable contact piece 82 and the auxiliary static contact piece 83 is enhanced, and the working stability of the relay is further enhanced.

Referring to fig. 6 and 12, the ceramic shell 11 is provided with a mounting hole 71 for the auxiliary terminal to pass through, in an assembled state, the auxiliary terminal is inserted into the mounting hole 71, a copper sleeve 72 is disposed between the auxiliary terminal and the mounting hole 71, and the copper sleeve 72 is sleeved on an outer peripheral side of the auxiliary terminal. Since the auxiliary terminals are inserted from the outside of the ceramic case 11, a seal must be formed between the auxiliary terminals and the mounting holes 71 of the ceramic case 11 in order to form the arc extinguishing chamber. In actual manufacturing, the diameter of the mounting hole 71 is generally much larger than the radius of the terminal, so if the auxiliary terminal is directly welded to the ceramic shell 11, the welding is difficult, and more chips are easily generated to fall into the relay, which causes safety problems. Therefore, in the embodiment, the copper sleeve 72 is sleeved outside the auxiliary terminal, the auxiliary terminal is fixed in the mounting hole 71, and then welding sealing is performed, so that the welding labor intensity is obviously reduced, and chips can be effectively prevented from falling into the relay during welding. In order to further improve the convenience of welding the copper bush 72, the mounting hole 71 is arranged in a conical shape, that is, the longitudinal section of the mounting hole 71 is arranged in a conical shape, and the mounting hole 71 and the copper bush 72 can be limited and fixed by the friction force between the mounting hole 71 and the copper bush before welding through the conical characteristic, so that the auxiliary terminal is prevented from loosening in the welding process, and the welding quality is improved.

In the present embodiment, referring to fig. 2, each auxiliary terminal 7 is connected to the PCB 4 through a wire, the output end of the auxiliary terminal 7 is connected to the input end of the external terminal 3 through the PCB 4, and the external terminal 3 is a connector with a DB15 pin interface, that is, the interface of the external terminal 3 is of a DB15 pin interface type. Similarly, the output end of the voltage acquisition module on the PCB 4 is connected to the input end of the external terminal 3 through the PCB 4. Adopt the connector of DB15 needle interface as the delivery outlet, replaced the mode that adopts single terminal post in the past, need not to set up a plurality of terminal posts and correspond each electronic component's signal output part, simplified the output interface of relay, it is more convenient and firm during the connection.

Referring to fig. 13 and 14, in the present embodiment, the relay with the connector further includes a controller 200, the controller 200 is disposed on a side surface of the housing 1, a connection plate 201 is disposed between the controller 200 and the housing 1, the connection plate 201 is provided with a first countersunk hole 211 and a second countersunk hole 212, a first screw screwed with the side surface of the housing 1 is disposed in the first countersunk hole 211, a second screw screwed with the side surface of the controller 200 is disposed in the second countersunk hole 212, and the controller 200 is also provided with a D-SUB connector with a DB15 pin interface. Traditional controller generally all is integrated on PCB board 4, then can lead to traditional relay cost higher like this, to some relay disconnection and closed function that only need to use, need not to use the relay that the condition that obtains relay working data can adopt this embodiment, the relay of this embodiment can be through dismantling controller 200 to save the consumption of cost, in addition, to the condition that controller 200 damaged, only need dismantle controller 200 change can, need not the whole dismouting of relay.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An auxiliary terminal structure for a relay comprises a relay body, a driving mechanism, a movable contact bridge, a driving shaft and two static contact bridges; the two static contact bridges are fixedly arranged on the relay body; the drive shaft is installed in the relay body, the movable contact bridge passes through insulating part and installs drive shaft upper end, its characterized in that: the auxiliary terminal structure for the relay further comprises an insulating clamping piece, an insulating seat, an auxiliary movable contact piece, an auxiliary static contact piece and two auxiliary terminals, wherein the insulating seat is fixed inside the relay body, the auxiliary movable contact piece and the auxiliary static contact piece are detachably mounted on the insulating seat, the two auxiliary terminals are inserted into the relay body and are respectively and correspondingly fixedly connected with one end of the auxiliary movable contact piece and one end of the auxiliary static contact piece, and a movable contact and a static contact are respectively and fixedly mounted at the other end of the auxiliary movable contact piece and the other end of the auxiliary static contact piece;

the movable contact and the fixed contact are arranged at intervals in the height direction, the driving shaft is sleeved with an insulating clamping piece, the peripheral side of the insulating clamping piece extends out of the clamping block, and the end part of the auxiliary movable contact extends towards the clamping block and is arranged on the peripheral side of the clamping block in a surrounding mode.

2. The relay auxiliary terminal structure according to claim 1, wherein: the clamping blocks are arranged in a straight strip shape.

3. The relay auxiliary terminal structure according to claim 2, wherein: the clamping block is provided with a plurality of through holes.

4. The relay auxiliary terminal structure according to claim 1, wherein: the end part of the auxiliary moving contact piece is turned over back to the length direction of the auxiliary moving contact piece to form a turning part tightly attached to the auxiliary moving contact piece, a clamping head is formed at one end part of the auxiliary moving contact piece, and a mounting hole penetrating through the turning part is formed at the other end part of the auxiliary moving contact piece.

5. The relay auxiliary terminal structure according to claim 4, wherein: the turning-folding part is tightly attached to the auxiliary movable contact piece through flattening processing.

6. The relay auxiliary terminal structure according to claim 1, wherein: the auxiliary movable contact piece is provided with a plurality of positioning holes for positioning, and convex rings are formed on the positioning holes upwards.

7. The relay auxiliary terminal structure according to claim 6, wherein: and the convex ring of the positioning hole is formed on the auxiliary movable contact piece through flanging.

8. The relay auxiliary terminal structure according to claim 4, wherein: the clamping head comprises a first clamping piece and a second clamping piece which are used for clamping the signal end part, the first clamping piece and the second clamping piece are arranged in a vertical V shape, one end of the first clamping piece is fixedly connected with the auxiliary movable contact piece, the other end of the first clamping piece is fixedly connected with one end of the second clamping piece, the other end of the second clamping piece is bent upwards in an inclined mode to form a second clamping part, and the joint of the first clamping piece and the auxiliary movable contact piece is bent downwards in an inclined mode to form the first clamping part.