阅读说明：本技术 一种并联式电路过流保护散热装置 (Parallel circuit overcurrent protection heat abstractor ) 是由 鞠紫萍 于 2021-01-06 设计创作，主要内容包括：本发明公开的一种并联式电路过流保护散热装置,包括装置箱体,所述装置箱体内设有插座腔,所述插座腔右侧内壁上转动连接有转动轴,所述转动轴内设有开口向左的放置腔,所述放置腔内花键连接有滑动螺纹杆,所述滑动螺纹杆右端面与所述放置腔右侧内壁之间固设有复位弹簧；本发明当电路中的电流升高时,利用并联分流的原理在线路中并联一个衔接电阻,以降低电路中的电流,同时通过左右移动的鼓风扇叶对输电线进行及时的散热,降低安全隐患,当电路中的电流超载时,此时滑动齿条向下滑动,使得滑动螺纹杆带动导电插头向右滑动,使得导电插头与导电插座快速的断开连接,以保护电路和用电器。(The invention discloses a parallel circuit overcurrent protection heat dissipation device which comprises a device box body, wherein a socket cavity is arranged in the device box body, the inner wall of the right side of the socket cavity is rotatably connected with a rotating shaft, a placing cavity with a leftward opening is arranged in the rotating shaft, a sliding threaded rod is connected in the placing cavity through a spline, and a reset spring is fixedly arranged between the right end face of the sliding threaded rod and the inner wall of the right side of the placing cavity; when the current in the circuit rises, a connecting resistor is connected in parallel in the circuit by utilizing the parallel shunt principle to reduce the current in the circuit, and meanwhile, the power transmission line is timely radiated by the left and right moving blast fan blades to reduce the potential safety hazard.)

1. The utility model provides a parallel circuit overcurrent protection heat abstractor, includes the device box, its characterized in that: a socket cavity is arranged in the device box body, a rotating shaft is rotatably connected to the inner wall of the right side of the socket cavity, a placing cavity with a left opening is arranged in the rotating shaft, a sliding threaded rod is connected to a spline in the placing cavity, a reset spring is fixedly arranged between the right end face of the sliding threaded rod and the inner wall of the right side of the placing cavity, a conductive plug is rotatably connected to the left end of the sliding threaded rod and is in sliding fit with the socket cavity, a sliding rack is slidably arranged on the inner wall of the lower side of the socket cavity on the right side of the conductive plug, a through hole which penetrates through the socket cavity from left to right is formed in the sliding rack, a threaded block is fixedly arranged on the inner wall of the lower side of the through hole, the sliding threaded rod is positioned; the device box in the right side in socket chamber is equipped with the heat dissipation chamber of opening right, be equipped with the guiding hole that the opening is decurrent on the inboard wall of heat dissipation chamber upside, the guiding hole internal slip is equipped with the screw thread slider, the lower extreme of screw thread slider is located heat dissipation intracavity and rigid coupling have linking resistance, the rigid coupling has the power transmission line on the inboard wall of heat dissipation chamber left side, the power transmission line with electrically conductive plug electric connection, the link motor has set firmly on the inboard wall of heat dissipation chamber downside, the link motor with linking resistance electric connection, rotate on the inboard wall of heat dissipation chamber left side and be connected with reciprocal lead screw, threaded connection has the sliding block on the reciprocal lead screw, the sliding block in the rear side of reciprocal lead screw, the rotation of lining up from top to bottom is connected with the flabellum axle, the.

2. A parallel circuit overcurrent protection heat sink as recited in claim 1, wherein: be equipped with the ascending sliding tray of opening on the heat dissipation chamber downside inner wall, the lower extreme of flabellum axle is located the sliding tray is interior, on the heat dissipation chamber downside inner wall about the rotation of sliding tray bilateral symmetry is connected with two power shafts, equal rigid coupling has synchronous pulley on the power shaft, two synchronous pulley passes through synchronous belt and connects, on the flabellum axle in the downside rigid coupling of sliding block has linkage belt pulley, linkage belt pulley with synchronous belt meshing, it is left power shaft lower extreme power connect in on the up end of linkage motor, it is left on the power shaft in synchronous pulley's downside rigid coupling has the linkage bevel gear, on the reciprocal lead screw in the left side rigid coupling of sliding block has the cooperation bevel gear, the cooperation bevel gear with the linkage bevel gear meshing.

3. A parallel circuit overcurrent protection heat sink as recited in claim 2, wherein: the device box in the left side in heat dissipation chamber is equipped with the worm wheel chamber, rotate between the inside wall around the worm wheel chamber and be connected with the location axle, the rigid coupling has linkage gear, linkage worm wheel on the location axle, the linkage gear is located the rear side of linkage worm wheel, the lower extreme of slip rack is located the worm wheel intracavity and with the linkage gear meshing, rotate on the inner wall of worm wheel chamber left side and be connected with the linkage worm, the linkage worm with the linkage worm wheel meshing, be equipped with opening right splined hole on the linkage worm right-hand member face, be equipped with opening sliding hole left in the reciprocal lead screw, the splined connection in the sliding hole is equipped with the slide bar, the slide bar right-hand member face with set firmly thrust spring between the inner wall of sliding hole right side, the left end of slide bar is located the worm wheel intracavity.

4. A parallel circuit overcurrent protection heat sink as recited in claim 3, wherein: the device box in the upside in heat dissipation chamber is equipped with the power chamber, it is connected with the universal driving shaft to rotate on the inner wall of power chamber right side, be equipped with the spring chamber of opening left in the universal driving shaft, spring intracavity splined connection has the synchronizing shaft, the synchronizing shaft right-hand member face with set firmly electromagnetic spring between the inner wall of spring chamber right side, the rigid coupling has two synchronous bevel gears on the synchronizing shaft, it is connected with the threaded rod to rotate on the inner wall of power chamber downside, threaded rod upper end rigid coupling has linking bevel gear, the lower extreme threaded connection of threaded rod in on the screw slider.

5. A parallel circuit overcurrent protection heat sink as recited in claim 4, wherein: the utility model discloses a power transmission device, including power cavity, driven bevel gear, drive bevel gear, transmission shaft, driven bevel gear, drive bevel gear, driven bevel gear and drive bevel gear meshing.

6. A parallel circuit overcurrent protection heat sink as recited in claim 1, wherein: and a power transmission line is fixedly connected to the left end face of the conductive socket and is electrically connected with an external electrical appliance.

Technical Field

The invention relates to the related field of overcurrent protection circuit devices, in particular to a parallel circuit overcurrent protection heat dissipation device.

Background

Overcurrent protection is when the electric current surpasss predetermined maximum value, make a protection mode of protection device action, when the electric current grow in the circuit, can make the calorific capacity grow of wire, untimely reduce the electric current in the circuit and dispel the heat, can make the heat in the circuit pile up, the potential safety hazard of causing the conflagration has, when the electric current overloads, untimely cutting off the circuit not only can make with electrical apparatus damage, and can make the rubber in the transmission line damage, make the circuit lose insulativity, cause danger easily.

The parallel circuit overcurrent protection heat dissipation device can solve the problems.

Disclosure of Invention

In order to solve the problems, the parallel circuit overcurrent protection heat dissipation device comprises a device box body, a socket cavity is arranged in the device box body, a rotating shaft is rotatably connected to the inner wall of the right side of the socket cavity, a placing cavity with a left opening is arranged in the rotating shaft, a sliding threaded rod is connected in the placing cavity through a spline, a reset spring is fixedly arranged between the right end face of the sliding threaded rod and the inner wall of the right side of the placing cavity, a conductive plug is rotatably connected to the left end of the sliding threaded rod and is in sliding fit with the socket cavity, a sliding rack is arranged on the inner wall of the lower side of the socket cavity in a sliding mode on the right side of the conductive plug, a through hole which is communicated from left to right is arranged in the sliding rack, a thread block is fixedly arranged on the inner wall of the lower side of the through hole, and the sliding threaded rod is, a conductive socket is fixedly arranged on the inner wall of the left side of the socket cavity; a heat dissipation cavity with a right opening is arranged on the right side of the socket cavity in the device box body, a guide hole with a downward opening is formed in the inner wall of the upper side of the heat dissipation cavity, a threaded slider is arranged in the guide hole in a sliding mode, the lower end of the threaded slider is located in the heat dissipation cavity and fixedly connected with a connecting resistor, a power transmission line is fixedly connected to the inner wall of the left side of the heat dissipation cavity and electrically connected with the conductive plug, a linkage motor is fixedly arranged on the inner wall of the lower side of the heat dissipation cavity and electrically connected with the connecting resistor, a reciprocating lead screw is rotatably connected to the inner wall of the left side of the heat dissipation cavity, a sliding block is connected to the reciprocating lead screw in a threaded mode, a fan blade shaft is rotatably connected to the inside of the sliding block in a vertically through mode; the rotating shaft rotates to drive the sliding threaded rod to rotate, the sliding threaded rod is driven to move leftwards through the threaded block and pull the reset spring, the conductive plug is driven to move leftwards, the conductive plug is connected with the conductive socket, the circuit is connected, when the current in the power transmission line rises to heat the power transmission line, the threaded sliding block slides downwards along the guide hole to drive the connecting resistor to slide downwards to abut against the power transmission line and to be connected in parallel to the circuit of the power transmission line, the current in the power transmission line is reduced according to the principle of parallel shunt in the circuit, when the connecting resistor is connected into the circuit, the linkage motor is powered on to start, the blower blades are driven to rotate and move leftwards and rightwards simultaneously, the heat dissipation is carried out on the power transmission line, when the circuit in the power transmission line is overloaded, the sliding rack slides downwards to disengage the threaded block from the threaded block, and then drive the slip threaded rod to slide right under reset spring's elasticity effect, and then drive the electrically conductive plug and slide right, and then make electrically conductive plug and electrically conductive socket break away from the connection for the circuit disconnection, with the protection circuit.

Beneficially, a sliding groove with an upward opening is formed in the inner wall of the lower side of the heat dissipation cavity, the lower ends of the fan blade shafts are located in the sliding groove, two power shafts are rotationally connected to the inner wall of the lower side of the heat dissipation cavity in a bilateral symmetry manner with respect to the sliding groove, the power shafts are fixedly connected with synchronous belt wheels, the two synchronous belt wheels are connected through synchronous belts, a linkage belt pulley is fixedly connected to the lower side of the sliding block on each fan blade shaft, the linkage belt pulley is meshed with the synchronous belt, the lower end of the power shaft on the left side is dynamically connected to the upper end face of the linkage motor, a linkage bevel gear is fixedly connected to the lower side of the synchronous belt wheel on the power shaft on the left side, a matching bevel gear is fixedly connected to the reciprocating screw rod on the left side of the sliding block, and the matching; the linkage motor is started, the power shaft drives the synchronous belt pulley to rotate, the linkage belt pulley drives the fan blade shaft to rotate, the fan blade shaft is driven to rotate through the linkage belt pulley, the blowing fan blade is driven to rotate, the power shaft drives the linkage bevel gear to rotate while rotating, the reciprocating lead screw is driven to rotate through the matching bevel gear, the sliding block drives the fan blade shaft to slide left and right, the blowing fan blade is driven to move left and right, and comprehensive heat dissipation is conducted on a power transmission line.

Beneficially, a worm wheel cavity is arranged on the left side of the heat dissipation cavity in the device box, a positioning shaft is rotatably connected between the front inner wall and the rear inner wall of the worm wheel cavity, a linkage gear and a linkage worm wheel are fixedly connected to the positioning shaft, the linkage gear is located on the rear side of the linkage worm wheel, the lower end of the sliding rack is located in the worm wheel cavity and meshed with the linkage gear, a linkage worm is rotatably connected to the inner wall of the left side of the worm wheel cavity and meshed with the linkage worm wheel, a spline hole with a right opening is formed in the right end face of the linkage worm, a sliding hole with a left opening is formed in the reciprocating lead screw, a sliding rod is arranged in spline connection in the sliding hole, a thrust spring is fixedly arranged between the right end face of the sliding rod and the inner wall of the right side of the sliding hole, and the left end; the thrust spring circular telegram, and then promote the slide bar and slide left for slide bar and splined hole spline fit, and then drive the linkage worm through the slide bar and rotate, and then drive the location axle through the linkage worm wheel and rotate, and then drive the slip rack through the linkage gear and slide down, and then make the screw thread piece and slip threaded rod break away from the meshing, make the slip threaded rod slide right, the connection status of disconnection way.

Beneficially, a power cavity is arranged on the upper side of the heat dissipation cavity in the device box body, a linkage shaft is rotatably connected to the inner wall of the right side of the power cavity, a spring cavity with a leftward opening is arranged in the linkage shaft, a synchronizing shaft is connected to the inside of the spring cavity through a spline, an electromagnetic spring is fixedly arranged between the right end face of the synchronizing shaft and the inner wall of the right side of the spring cavity, two synchronizing bevel gears are fixedly connected to the synchronizing shaft, a threaded rod is rotatably connected to the inner wall of the lower side of the power cavity, a connecting bevel gear is fixedly connected to the upper end of the threaded rod, and the lower end of; the universal driving shaft rotates, and then drives synchronous bevel gear through the synchronizing shaft and rotates, and then drives linking bevel gear through synchronous bevel gear and rotates, and then drives the screw slider through the threaded rod and slides downwards, and then makes linking resistance inconsistent and make linking resistance parallel connection go into in the circuit of power transmission line with the power transmission line.

Beneficially, a power motor is fixedly arranged on the inner wall of the upper side of the power cavity, a power output shaft is dynamically connected to the lower end face of the power motor, a driving bevel gear is fixedly connected to the lower end of the power output shaft, a driven bevel gear is fixedly connected to the linkage shaft and meshed with the driving bevel gear, a transmission shaft is rotatably connected to the left side of the threaded rod on the inner wall of the lower side of the driving bevel gear, a transition bevel gear is fixedly connected to the upper end of the transmission shaft, the lower end of the transmission shaft is located in the socket cavity and fixedly connected with a transmission bevel gear, a rotating bevel gear is fixedly connected to the rotation shaft, and the transmission bevel gear is meshed with the rotating; transition bevel gear rotates, and then drives transmission bevel gear through the transmission shaft and rotates, and then drives the axis of rotation through rotating bevel gear and rotates, and then drives the rotation of slip threaded rod, and then promotes conductive plug left.

Advantageously, a power transmission line is fixedly connected to the left end face of the conductive socket, and the power transmission line is electrically connected with an external electrical appliance.

The invention has the beneficial effects that: when the current in the circuit rises, a connecting resistor is connected in parallel in the circuit by utilizing the parallel shunt principle to reduce the current in the circuit, and meanwhile, the power transmission line is timely radiated by the left and right moving blast fan blades to reduce the potential safety hazard.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic diagram of an overall structure of a parallel circuit overcurrent protection heat dissipation device according to the present invention.

FIG. 2 is an enlarged schematic view of A in FIG. 1;

FIG. 3 is an enlarged schematic view of B of FIG. 1;

FIG. 4 is a schematic diagram of the structure of C-C in FIG. 1;

FIG. 5 is a schematic diagram of D-D of FIG. 2;

FIG. 6 is a schematic diagram of the structure of E-E in FIG. 2.

Detailed Description

The invention will now be described in detail with reference to fig. 1 to 6, for the sake of convenience of description, the following orientations are now defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The invention relates to a parallel circuit overcurrent protection heat dissipation device, which comprises a device box body 11, wherein a socket cavity 36 is arranged in the device box body 11, the inner wall of the right side of the socket cavity 36 is rotatably connected with a rotating shaft 61, a placing cavity 62 with a leftward opening is arranged in the rotating shaft 61, a sliding threaded rod 56 is connected in the placing cavity 62 through a spline, a return spring 60 is fixedly arranged between the right end surface of the sliding threaded rod 56 and the inner wall of the right side of the placing cavity 62, the left end of the sliding threaded rod 56 is rotatably connected with a conductive plug 39, the conductive plug 39 is in sliding fit with the socket cavity 36, a sliding rack 40 is arranged on the inner wall of the lower side of the socket cavity 36 on the right side of the conductive plug 39 in a sliding manner, a through hole 55 which is communicated from left to right is arranged in the sliding rack 40, a threaded block 57 is fixedly arranged on the inner wall of the, a conductive socket 37 is fixedly arranged on the inner wall of the left side of the socket cavity 36; a heat dissipation chamber 20 opened to the right is provided in the device case 11 at the right side of the socket chamber 36, a guide hole 22 with a downward opening is arranged on the inner wall of the upper side of the heat dissipation cavity 20, a threaded slide block 32 is arranged in the guide hole 22 in a sliding manner, the lower end of the threaded slider 32 is positioned in the heat dissipation cavity 20 and is fixedly connected with a connecting resistor 21, a power line 19 is fixedly connected to the inner wall of the left side of the heat dissipation cavity 20, the power line 19 is electrically connected with the conductive plug 39, a linkage motor 44 is fixedly arranged on the inner wall of the lower side of the heat dissipation cavity 20, the linkage motor 44 is electrically connected with the connecting resistor 21, the inner wall of the left side of the heat dissipation cavity 20 is rotatably connected with a reciprocating lead screw 41, the reciprocating lead screw 41 is in threaded connection with a sliding block 51, a fan blade shaft 53 is connected to the slide block 51 at the rear side of the reciprocating screw 41 in a vertically through manner, and a blower fan blade 52 is fixed to the upper end of the fan blade shaft 53; the rotating shaft 61 rotates to drive the sliding threaded rod 56 to rotate, the sliding threaded rod 56 is driven to move leftwards through the threaded block 57 and pull the return spring 60, the conductive plug 39 is driven to move leftwards, the conductive plug 39 is connected with the conductive socket 37, the circuit is connected at the moment, when the current in the power transmission line 19 rises to heat the power transmission line 19, the threaded sliding block 32 slides downwards along the guide hole 22 at the moment, the connecting resistor 21 is driven to slide downwards to abut against the power transmission line 19 and is connected in parallel to the circuit of the power transmission line 19, the current in the power transmission line 19 is reduced according to the principle of parallel shunt in the circuit, when the connecting resistor 21 is connected into the circuit, the linkage motor 44 is electrified and started at the moment, the blower fan blade 52 is driven to rotate and move leftwards and rightwards, the heat of the power transmission line 19 is dissipated, when the circuit in the power transmission, at this time, the sliding rack 40 slides downwards, so that the thread block 57 is disengaged from the thread block 57, and then the sliding threaded rod 56 is driven to slide rightwards under the elastic force of the return spring 60, and then the conductive plug 39 is driven to slide rightwards, so that the conductive plug 39 is disconnected from the conductive socket 37, and the circuit is disconnected, thereby protecting the circuit.

Advantageously, the inner wall of the lower side of the heat dissipation cavity 20 is provided with a sliding groove 47 with an upward opening, the lower end of the fan blade shaft 53 is positioned in the sliding groove 47, two power shafts 45 are rotatably connected on the lower inner wall of the heat dissipation cavity 20 in bilateral symmetry with the sliding groove 47, the power shaft 45 is fixedly connected with synchronous belt wheels 46, the two synchronous belt wheels 46 are connected through a synchronous belt 49, a linkage belt pulley 48 is fixedly connected on the lower side of the sliding block 51 on the fan blade shaft 53, the linkage belt pulley 48 is meshed with the synchronous belt 49, the lower end of the power shaft 45 on the left side is in power connection with the upper end surface of the linkage motor 44, a linkage bevel gear 43 is fixedly connected on the lower side of the synchronous belt pulley 46 on the power shaft 45 on the left side, a matching bevel gear 42 is fixedly connected to the reciprocating screw 41 on the left side of the sliding block 51, and the matching bevel gear 42 is meshed with the linkage bevel gear 43; the linkage motor 44 is started, the synchronous belt pulley 46 is driven to rotate through the power shaft 45, the fan blade shaft 53 is driven to rotate through the linkage belt pulley 48, the blower fan blade 52 is driven to rotate, the linkage bevel gear 43 is driven to rotate while the power shaft 45 rotates, the reciprocating lead screw 41 is driven to rotate through the matching bevel gear 42, the fan blade shaft 53 is driven to slide left and right through the sliding block 51, the blower fan blade 52 is driven to move left and right, and comprehensive heat dissipation is conducted on the power transmission line 19.

Beneficially, a worm wheel cavity 15 is arranged at the left side of the heat dissipation cavity 20 in the device case 11, a positioning shaft 17 is rotatably connected between the front inner wall and the rear inner wall of the worm wheel cavity 15, a linkage gear 13 and a linkage worm wheel 14 are fixedly connected to the positioning shaft 17, the linkage gear 13 is arranged at the rear side of the linkage worm wheel 14, the lower end of the sliding rack 40 is arranged in the worm wheel cavity 15 and is meshed with the linkage gear 13, a linkage worm 12 is rotatably connected to the inner wall at the left side of the worm wheel cavity 15, the linkage worm 12 is meshed with the linkage worm wheel 14, a spline hole 16 with a right opening is arranged on the right end face of the linkage worm 12, a sliding hole 50 with a left opening is arranged in the reciprocating screw 41, a sliding rod 18 is arranged in a spline connection in the sliding hole 50, a thrust spring 54 is fixedly arranged between the right end face of the sliding rod 18 and the inner wall at the right, the left end of the sliding rod 18 is positioned in the worm cavity 15; the thrust spring 54 is energized to push the sliding rod 18 to slide leftward, so that the sliding rod 18 is in spline fit with the spline hole 16, the sliding rod 18 drives the linkage worm 12 to rotate, the linkage worm wheel 14 drives the positioning shaft 17 to rotate, the linkage gear 13 drives the sliding rack 40 to slide downward, the threaded block 57 is disengaged from the sliding threaded rod 56, the sliding threaded rod 56 slides rightward, and the connection state of the lines is disconnected.

Beneficially, a power cavity 35 is arranged on the upper side of the heat dissipation cavity 20 in the device box 11, a linkage shaft 23 is rotatably connected to the inner wall of the right side of the power cavity 35, a spring cavity 28 with a leftward opening is arranged in the linkage shaft 23, a synchronizing shaft 33 is connected to the inner spline of the spring cavity 28, an electromagnetic spring 29 is fixedly arranged between the right end surface of the synchronizing shaft 33 and the inner wall of the right side of the spring cavity 28, two synchronizing bevel gears 34 are fixedly connected to the synchronizing shaft 33, a threaded rod 31 is rotatably connected to the inner wall of the lower side of the power cavity 35, a connecting bevel gear 30 is fixedly connected to the upper end of the threaded rod 31, and the lower end of the threaded rod 31 is connected to; the universal driving shaft 23 rotates, and then drives the synchronous bevel gear 34 to rotate through the synchronous shaft 33, and then drives the engaging bevel gear 30 to rotate through the synchronous bevel gear 34, and then drives the threaded slider 32 to slide downwards through the threaded rod 31, and then makes the engaging resistor 21 inconsistent with the power transmission line 19 and makes the engaging resistor 21 connect in parallel into the circuit of the power transmission line 19.

Beneficially, a power motor 27 is fixedly arranged on the inner wall of the upper side of the power cavity 35, a power output shaft 26 is dynamically connected to the lower end face of the power motor 27, a driving bevel gear 25 is fixedly connected to the lower end of the power output shaft 26, a driven bevel gear 24 is fixedly connected to the linkage shaft 23, the driven bevel gear 24 is meshed with the driving bevel gear 25, a transmission shaft 65 is rotatably connected to the left side of the threaded rod 31 on the inner wall of the lower side of the driving bevel gear 25, a transition bevel gear 64 is fixedly connected to the upper end of the transmission shaft 65, the lower end of the transmission shaft 65 is located in the socket cavity 36 and is fixedly connected with a transmission bevel gear 63, a rotation bevel gear 59 is fixedly connected to the rotation shaft 61, and the transmission bevel gear 63; the transition bevel gear 64 rotates, and in turn, the transmission bevel gear 63 rotates through the transmission shaft 65, and in turn, the rotating shaft 61 rotates through the rotating bevel gear 59, and in turn, the sliding threaded rod 56 rotates, and the conductive plug 39 is pushed to the left.

Advantageously, a power transmission line 38 is fixed to the left end face of the conductive socket 37, and the power transmission line 38 is electrically connected to an external electrical appliance.

The following will describe in detail the usage steps of a parallel circuit overcurrent protection heat sink in conjunction with fig. 1 to 6:

initially, the conductive plug 39 is not in contact with the conductive socket 37, the conductive plug 39 is located at the right limit position, the sliding rack 40 is located at the upper limit position, the left side synchronizing bevel gear 34 is meshed with the transition bevel gear 64, the thrust spring 54 is in a compressed state, the connecting resistor 21 is not in contact with the power line 19, and the sliding threaded rod 56 is meshed with the threaded block 57;

starting the power motor 27, driving the driving bevel gear 25 to rotate through the power output shaft 26, driving the linkage shaft 23 to rotate through the driven bevel gear 24, driving the synchronous bevel gear 34 to rotate through the synchronous shaft 33, driving the transition bevel gear 64 to rotate through the left synchronous bevel gear 34, driving the transmission bevel gear 63 to rotate through the transmission shaft 65, driving the rotating shaft 61 to rotate through the rotating bevel gear 59, driving the sliding threaded rod 56 to rotate, driving the sliding threaded rod 56 to slide leftward through 5, driving the conductive plug 39 to slide leftward, enabling the conductive plug 39 to be inserted into the conductive socket 37, powering off the power of the power motor 27 to stop rotating, and further transmitting the current in the power transmission line 19 to an electrical appliance through the conductive plug 39, the conductive socket 37 and the power transmission line 38, so that the electrical appliance normally works;

when the current in the power line 19 rises to heat the power line 19, the electromagnetic spring 29 is electrified and compressed to enable the right-side synchronous bevel gear 34 to be meshed with the engaging bevel gear 30, the power motor 27 is started, the right-side synchronous bevel gear 34 drives the engaging bevel gear 30 to rotate, the threaded rod 31 drives the threaded slider 32 to slide downwards, the engaging resistor 21 is driven to slide downwards to abut against the power line 19, the engaging resistor 21 is connected in parallel to a circuit of the power line 19, the current in the power line 19 is reduced according to the principle of parallel shunt in the circuit, when the engaging resistor 21 is connected into the circuit, the linkage motor 44 is electrified and started, the synchronous belt pulley 46 is driven to rotate through the power shaft 45, the linkage belt pulley 48 is driven to rotate through the synchronous belt 49, the fan blade shaft 53 is driven to rotate through the linkage belt pulley 48, and the fan blade 52 is driven to rotate, the power shaft 45 rotates and simultaneously drives the linkage bevel gear 43 to rotate, and further drives the reciprocating lead screw 41 to rotate through matching with the bevel gear 42, so that the sliding block 51 is driven to slide left and right along the reciprocating lead screw 41, and further drives the fan blade shaft 53 to slide left and right through the sliding block 51, so that the fan blade 52 is driven to move left and right, and further the comprehensive heat dissipation is performed on the power transmission line 19;

when a circuit in the power transmission line 19 is overloaded, at the moment, the thrust spring 54 is electrified and extends, so that the sliding rod 18 is driven to slide leftwards and is inserted into the spline hole 16, so that the sliding rod 18 is in spline fit with the spline hole 16, the reciprocating lead screw 41 rotates and simultaneously drives the sliding rod 18 to rotate, so that the sliding rod 18 drives the linkage worm 12 to rotate, so that the linkage worm wheel 14 drives the positioning shaft 17 to rotate, so that the linkage gear 13 drives the sliding rack 40 to slide downwards, so that the thread block 57 is disengaged from the sliding threaded rod 56, so that the sliding threaded rod 56 slides rightwards under the elastic force action of the return spring 60, so that the conductive plug 39 is driven to slide rightwards, the conductive plug 39 is disconnected from the conductive socket 37, so that the circuit is disconnected, the circuit is protected, and the electrical appliance is protected.

The invention has the beneficial effects that: when the current in the circuit rises, a connecting resistor is connected in parallel in the circuit by utilizing the parallel shunt principle to reduce the current in the circuit, and meanwhile, the power transmission line is timely radiated by the left and right moving blast fan blades to reduce the potential safety hazard.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.