CN219350045U - Control switch - Google Patents

Abstract

The utility model provides a control switch, which comprises a first straight key switch and a second straight key switch, wherein the first straight key switch and the second straight key switch are arranged on a middle frame; a lock tongue is arranged between the first straight key switch and the second straight key switch, a locking groove is arranged on a pressing shaft of the first straight key switch, and a pushing part is arranged on the pressing shaft of the second straight key switch; the double-metal spring plate comprises a normally closed station and a normally open station; the contactor is also provided with a control rod which enables the bimetal elastic sheet to be kept at the normally closed station before the first or second straight-key switch is pressed down, and leaves a movable space from the normally closed station to the normally open station when the bimetal elastic sheet heats after the first or second straight-key switch is pressed down. The utility model has the advantages of interlocking and overload protection.

Description

Control switch

Technical Field

The utility model relates to the field of switches, in particular to a control switch.

Background

The traditional switch is used as a component for controlling the on-off of the circuit, has a single function, can only realize the on-off of the circuit, and cannot carry out overload protection on the circuit; for some electrical appliances, especially in the occasions where overload and jamming easily occur and power failure is needed in time, the overload protection is usually realized by arranging corresponding overload protection devices in a circuit, other corresponding electrical elements are required to be arranged outside a switch, the overload protection is generally realized by automatic recovery or manual recovery, the automatic recovery needs corresponding detection ports, the manual recovery needs to be realized after the switch is disconnected, the power devices are jammed, the load release can be realized by reversing, or the overload protection is needed to be intervened again when the power devices are jammed during reversing; therefore, the current switch function cannot realize the function, and even if the current switch function needs to be realized, the overload protection can be released after the current is switched by combining a corresponding electronic circuit, so that the current switch is truly implemented, and a high-low voltage circuit, external additional components and the like can be certainly generated.

Disclosure of Invention

Based on the above problems, the present utility model aims to provide a control switch which can automatically disconnect a power supply when an overload occurs after a first straight key switch or a second straight key switch is pressed down and release overload protection after the first straight key switch or the second straight key switch is pressed down again while the first straight key switch and the second straight key switch can be only pressed down to realize interlocking.

Aiming at the problems, the following technical scheme is provided: a control switch comprises a first straight key switch and a second straight key switch which are arranged on a middle frame; a lock tongue is arranged between the first straight key switch and the second straight key switch, a locking groove is arranged on a pressing shaft of the first straight key switch, and a pushing part for pushing the lock tongue to enter the locking groove when the second straight key switch is pressed down is arranged on the pressing shaft of the second straight key switch; the double-metal spring plate comprises a normally closed station which enables the movable contact to be in contact with the fixed contact when the double-metal spring plate does not generate heat and a normally open station which enables the movable contact to be separated from the fixed contact and to pass through a dead point position and keep normally open when the double-metal spring plate generates heat; the contactor is also provided with a control rod which enables the bimetal elastic sheet to be kept at the normally-closed station before the first straight-key switch or the second straight-key switch is pressed down, and leaves a movable space from the normally-closed station to the normally-open station when the bimetal elastic sheet heats after the first straight-key switch or the second straight-key switch is pressed down.

In the structure, the first straight-key switch is used for controlling the first action of the load, the second straight-key switch is used for controlling the second action of the load, when the first straight-key switch is pressed down, the lock tongue locks the pressing shaft of the second straight-key switch, so that the second straight-key switch is prevented from being pressed down accidentally, and when the second straight-key switch is pressed down, the lock tongue locks the pressing shaft of the first straight-key switch, so that the first action and the second action of the load are prevented from being pressed down accidentally, and collision is caused; the contactor is used for controlling the on-off of the current of the first straight key switch and the second straight key switch, when the first straight key switch or the second straight key switch is pressed down to cause the load to work, short circuit, blocking or blocking rotation occurs, at the moment, the current is increased to cause the existing bimetal elastic sheet to generate heat to generate bending, the movable contact is separated from the fixed contact and passes over the dead point position to keep the contactor normally open, and because the dead point position exists, the elasticity of the bimetal elastic sheet cannot exceed the elasticity passing over the dead point position after being cooled, and therefore the contactor still keeps normally open; when the first straight key switch or the second straight key switch is pressed down, the control rod assists to push the bimetal elastic sheet to pass through the dead point position, and the contact between the movable contact and the static contact returns to the normally closed state again by means of self elasticity of the bimetal elastic sheet in the cooling state; when the first straight key switch or the second straight key switch is pressed down again, the control rod resets and is far away from the bimetal elastic sheet, so that a movable space is reserved for disconnecting the movable contact and the static contact for the next heating bending of the bimetal elastic sheet; therefore, the aim that the overload protection of the contactor can be relieved after the contactor enters the overload protection by disconnecting the circuit when any straight key switch is loaded on the premise that the first straight key switch and the second straight key switch are interlocked can be realized; when the motor is applied to an ice crusher, the first direct key switch is pressed to realize the forward rotation of the motor, when the current is increased due to the blocking and blocking of the motor in the forward rotation, the contactor is disconnected, the motor stops supplying power, the contactor returns to the normally closed state again until the first direct key switch is released, at the moment, the first direct key switch can be pressed again after the crushed ice is cleaned, or the second direct key switch is pressed to enable the motor to reversely rotate to release the blocking and blocking state, when the current is increased due to the blocking and blocking of the motor reversely rotated after the second direct key switch is pressed, the contactor is disconnected, the motor stops supplying power, and the contactor returns to the normally closed state again until the second direct key switch is released; the safety of the electric equipment can be effectively protected, and overload is avoided.

The utility model further provides a support connecting rod, wherein the middle section of the support connecting rod is a hinge point, one end of the support connecting rod is abutted against the control rod, and the other end of the support connecting rod is matched with the first straight-key switch and the second straight-key switch, so that the control rod moves in the direction opposite to the pressing direction of the first straight-key switch or the second straight-key switch when the first straight-key switch or the second straight-key switch is pressed.

In the structure, the control rod can be ensured to leave a normally open space for the bimetal elastic sheet of the contactor when the first straight key switch or the second straight key switch is pressed down, so that the power supply is disconnected when the first straight key switch or the second straight key switch controls the load to work and overload occurs.

The utility model is further arranged that the support connecting rod is provided with a first spring which enables the swing direction of the support connecting rod to be opposite to the pressing direction of the first straight key switch or the second straight key switch.

In the structure, the first spring enables the support connecting rod to be always propped against the first straight key switch or the second straight key switch in the pressed state, so that the generation of a virtual position is avoided.

The utility model is further arranged that the first spring is a cylindrical spring or a conical spring arranged at one end of the supporting connecting rod or a torsion spring arranged at the hinge part of the supporting connecting rod.

In the above structure, the first spring is preferably a cylindrical spring.

The utility model is further arranged that a dead point spring piece positioned at one side of the swinging end of the bimetal spring piece is also arranged in the contactor; the dead point spring plate is arc-shaped, one end of the dead point spring plate is propped against the inner wall of the contactor, and the other end of the dead point spring plate is propped against the swinging end of the bimetal spring plate so as to generate thrust force towards the fixed end direction of the bimetal spring plate; the virtual arc line generated by the swinging end of the bimetal spring plate during swinging and the dead point position of the swinging end of the bimetal spring plate are the tangent points between the virtual arc line generated by taking the end of the dead point spring plate, which is abutted against the inner wall of the contactor, as the circle center.

In the structure, the tangential point of the bimetal spring plate and the dead point spring plate is the dead point position, so that the bimetal spring plate can be locked on the normally closed station or the normally open station under the pushing of the dead point spring plate, when the bimetal spring plate bends and is locked on the normally open station due to heating, the force of the bimetal spring plate passing through the dead point position is larger than the force of the bimetal spring plate, which is generated when the bimetal spring plate swings towards the original normally closed station again after the temperature of the bimetal spring plate drops after the circuit is disconnected, the bimetal spring plate can be kept on the normally open station, and can pass through the dead point position to enter the normally closed state again only under the auxiliary pushing of the control rod.

The utility model is further arranged that the first direct key switch is a normally open switch before being pressed down; the second straight key switch comprises a normally open circuit and a normally closed circuit before being pressed down, and the normally open circuit is switched on and the normally closed circuit is switched off after the second straight key switch is pressed down.

In the structure, the first straight key switch is in an on state after being pressed down, the normally open circuit of the second straight key switch before being pressed down is changed into a normally closed circuit, the normally closed circuit is changed into a normally open circuit, and the first straight key switch and the second straight key switch are connected through a cable to realize current commutation.

The pushing part is an inclined plane, and the lock tongue is matched with the inclined plane to push the lock tongue to enter the locking groove to lock the pressing shaft of the first straight key switch when the pressing shaft of the second straight key switch is pressed down; the lock tongue is provided with a second spring which pushes the lock tongue to be separated from the locking groove to be unlocked when the pressing shaft of the second straight key switch is reset.

In the structure, the second spring is used for controlling the reset of the lock tongue.

The utility model is further arranged that the first straight key switch has a pressing locking function, and the second straight key switch has no locking function.

In the above structure, the first straight key switch is used for normal forward rotation of the motor, so that the motor is kept in a pressed state by pressing the locking function after being pressed, and is reset after being pressed again; the second straight key switch is used for reversing the motor when the motor is locked or blocked, so that the motor only needs to be turned on, and the locking function is not required to be set.

The utility model is further arranged that the middle frame is externally covered with a shell, and the support connecting rod is hinged with the shell; the pressing shafts of the first straight key switch and the second straight key switch extend outwards from the shell and are provided with pressing caps, and one end of the supporting connecting rod, which is back to the control rod and is matched with the control rod, is positioned outside the shell and abuts against the pressing caps of the first straight key switch and the second straight key switch.

In the structure, the pressing cap is provided with the cap edge, one end of the supporting connecting rod, which is back to the control rod, is provided with the cross rod, and two ends of the cross rod are respectively propped against the cap edges of the pressing caps on the first straight key switch and the second straight key switch.

The utility model is further arranged that the shell is provided with a key groove, the pressing cap is positioned in the key groove, and the side wall of the key groove is provided with a water outlet.

In the structure, when the water outlet is used on the ice crusher, the water outlet is downwards arranged and can be used for draining water.

The utility model has the beneficial effects that: the first straight key switch is used for controlling the first action of the load, the second straight key switch is used for controlling the second action of the load, when the first straight key switch is pressed down, the lock tongue locks the pressing shaft of the second straight key switch, the accidental pressing of the second straight key switch is avoided, when the second straight key switch is pressed down, the lock tongue locks the pressing shaft of the first straight key switch, the accidental pressing of the first straight key switch is avoided, and therefore the first action and the second action of the load are prevented from being in conflict; the contactor is used for controlling the on-off of the current of the first straight key switch and the second straight key switch, when the first straight key switch or the second straight key switch is pressed down to cause the load to work, short circuit, blocking or blocking rotation occurs, at the moment, the current is increased to cause the existing bimetal elastic sheet to generate heat to generate bending, the movable contact is separated from the fixed contact and passes over the dead point position to keep the contactor normally open, and because the dead point position exists, the elasticity of the bimetal elastic sheet cannot exceed the elasticity passing over the dead point position after being cooled, and therefore the contactor still keeps normally open; when the first straight key switch or the second straight key switch is pressed down, the control rod assists to push the bimetal elastic sheet to pass through the dead point position, and the contact between the movable contact and the static contact returns to the normally closed state again by means of self elasticity of the bimetal elastic sheet in the cooling state; when the first straight key switch or the second straight key switch is pressed down again, the control rod resets and is far away from the bimetal elastic sheet, so that a movable space is reserved for disconnecting the movable contact and the static contact for the next heating bending of the bimetal elastic sheet; therefore, the aim that the overload protection of the contactor can be relieved after the contactor enters the overload protection by disconnecting the circuit when any straight key switch is loaded on the premise that the first straight key switch and the second straight key switch are interlocked can be realized; when the motor is applied to an ice crusher, the first direct key switch is pressed to realize the forward rotation of the motor, when the current is increased due to the blocking and blocking of the motor in the forward rotation, the contactor is disconnected, the motor stops supplying power, the contactor returns to the normally closed state again until the first direct key switch is released, at the moment, the first direct key switch can be pressed again after the crushed ice is cleaned, or the second direct key switch is pressed to enable the motor to reversely rotate to release the blocking and blocking state, when the current is increased due to the blocking and blocking of the motor reversely rotated after the second direct key switch is pressed, the contactor is disconnected, the motor stops supplying power, and the contactor returns to the normally closed state again until the second direct key switch is released; the safety of the electric equipment can be effectively protected, and overload is avoided.

Drawings

Fig. 1 is a schematic overall perspective view of the present utility model.

Fig. 2 is a schematic view of the explosive structure of the cap according to the present utility model.

Fig. 3 is an exploded view of the first view housing according to the present utility model.

Fig. 4 is an exploded view of a second view housing according to the present utility model.

Fig. 5 is a schematic view of a first view of the middle frame structure of the present utility model.

Fig. 6 is a schematic view of a second view of the middle frame structure of the present utility model.

Fig. 7 is a schematic diagram of an explosion structure of a middle frame according to the present utility model.

Fig. 8 is a schematic view of the overall structure of the contactor of the present utility model.

Fig. 9 is a schematic diagram of a structure in which a bimetal spring plate in a contactor is located at a normally closed station before a first straight key switch and a second straight key switch are pressed down.

Fig. 10 is a schematic structural diagram of a control rod in a contactor moving up after a first straight key switch or a second straight key switch is pressed down and a bimetal spring plate is located at a normally closed station.

Fig. 11 is a schematic structural diagram of a bimetal spring piece in a contactor in a state that a load is short-circuited or blocked after a first straight key switch or a second straight key switch is pressed down, and the bimetal spring piece is heated and deformed to pass through a dead point position and then is positioned at a normally open station.

Fig. 12 is a schematic view showing the internal perspective structure of the contactor of the present utility model.

The meaning of the reference numerals in the figures: 10-middle frame; 11-a first direct key switch; 111-locking grooves; 12-a second straight key switch; 121-pushing part; 13-a lock tongue; 131-a second spring; 14-supporting a connecting rod; 141-a first spring; 142-a cross bar; a 20-contactor; 21-stationary contact; 22-a bimetal spring plate; 23-moving contact; 24-a control lever; 25-dead point shrapnel; 26-resetting the spring plate; 30-a housing; 31-pressing the cap; 311-cap rim; 32-pressing key grooves; 321-a water outlet.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

Referring to fig. 1 to 12, a control switch as shown in fig. 1 to 12 includes a first straight key switch 11 and a second straight key switch 12 mounted on a middle frame 10; a lock tongue 13 is arranged between the first straight key switch 11 and the second straight key switch 12, a locking groove 111 is arranged on a pressing shaft of the first straight key switch 11, and a pushing part 121 for pushing the lock tongue 13 into the locking groove 111 when the second straight key switch 12 is pressed down is arranged on the pressing shaft of the second straight key switch 12; the contactor 20 is internally provided with a fixed contact 21 and a movable contact 23 fixed on a bimetal spring plate 22, wherein the bimetal spring plate 22 comprises a normally closed station (in the state of fig. 9 and 10) for enabling the movable contact 23 to be in contact with the fixed contact 21 when the bimetal spring plate 22 does not generate heat, and a normally open station (in the state of fig. 11) for enabling the movable contact 23 to be separated from the fixed contact 21 and to pass through a dead point position and keep normally open when the bimetal spring plate 22 generates heat; the contactor 20 is further provided with a control lever 24 for keeping the bimetal spring plate 22 in a normally closed position (in the state of fig. 10) before the first straight-key switch 11 or the second straight-key switch 12 is pressed, and for allowing a movable space from the normally closed position (in the state of fig. 10) to the normally open position (in the state of fig. 11) when the bimetal spring plate 22 generates heat after the first straight-key switch 11 or the second straight-key switch 12 is pressed.

In the above structure, the first straight-key switch 11 is used for controlling the first action of the load, the second straight-key switch 12 is used for controlling the second action of the load (the first action and the second action include, but are not limited to, forward and reverse rotation when the load is a motor, and control of the load such as the first color temperature and the second color temperature when the load is an LED dual-color temperature light source), when the first straight-key switch 11 is pressed down, the lock tongue 13 locks the pressing shaft of the second straight-key switch 12, so that the second straight-key switch 12 is prevented from being accidentally pressed down, when the second straight-key switch 12 is pressed down, the lock tongue 13 locks the pressing shaft of the first straight-key switch 11, so that the first action and the second action of the load are prevented from being accidentally pressed down, and collision occurs; the contactor 20 is used for controlling the on-off of the current of the first straight key switch 11 and the second straight key switch 12, when the first straight key switch 11 or the second straight key switch 12 is pressed down to cause the load to work, short circuit, locking or locked rotation occurs, at the moment, the current is increased to cause the current bimetal spring plate 22 to generate heat to generate bending, the movable contact 23 is separated from the fixed contact 21 and passes over the dead point position to keep the contactor 20 normally open, and the elasticity of the bimetal spring plate 22 cannot exceed the elasticity passing over the dead point position after the bimetal spring plate 22 is cooled because of the dead point position, so the contactor 20 still keeps normally open; when the first straight key switch 11 or the second straight key switch 12 is pressed down, the control rod 24 assists to push the bimetal elastic sheet 22 to pass through the dead point position, and the contact between the movable contact 23 and the stationary contact 21 is returned to the normally closed state again by means of self elasticity of the bimetal elastic sheet 22 in the cooling state; when the first straight key switch 11 or the second straight key switch 12 is pressed down again, the control rod 24 resets and is far away from the bimetal elastic piece 22, so that a movable space is reserved for disconnecting the movable contact 23 and the fixed contact 21 for the next heating bending of the bimetal elastic piece 22; therefore, the aim that the circuit can be disconnected when any straight key switch is loaded on the premise that the first straight key switch 11 and the second straight key switch 12 are interlocked, so that the contactor 20 enters overload protection and the overload protection of the contactor 20 can be released after the straight key switch is released can be realized; when the motor is applied to an ice crusher, the first direct key switch 11 is pressed to realize the forward rotation of the motor, when the current is increased due to the blocking and blocking of the motor in the forward rotation, the contactor 20 is disconnected, the power supply of the motor is stopped, the contactor 20 returns to the normally closed state again until the first direct key switch 11 is loosened, at the moment, the first direct key switch 11 can be pressed again after the crushed ice is cleaned, or the blocking and blocking state of the motor is released by pressing the second direct key switch 12, if the current is increased due to the blocking and blocking of the motor in the reverse rotation after the second direct key switch 12 is pressed, the contactor 20 is disconnected, the power supply of the motor is stopped, and the contactor 20 returns to the normally closed state again until the second direct key switch 12 is loosened; the safety of the electric equipment can be effectively protected, and overload is avoided.

In this embodiment, the device further includes a support link 14, and the middle section of the support link 14 is a hinge point, so that one end of the support link abuts against the control lever 24, and the other end of the support link is adapted to the first straight-key switch 11 and the second straight-key switch 12, so that when the first straight-key switch 11 or the second straight-key switch 12 is pressed, the control lever 24 moves in a direction opposite to the pressing direction of the first straight-key switch 11 or the second straight-key switch 12.

In the above structure, the control rod 24 can be ensured to leave a normally open space for the bimetal elastic sheet 22 of the contactor 20 when the first straight-key switch 11 or the second straight-key switch 12 is pressed down, so that the power supply is disconnected when the first straight-key switch 11 or the second straight-key switch 12 controls the load to work and overload occurs.

In this embodiment, the support link 14 is provided with a first spring 141 that makes the swing direction opposite to the pressing direction of the first straight key switch 11 or the second straight key switch 12.

In the above configuration, the first spring 141 keeps the support link 14 against the first straight-key switch 11 or the second straight-key switch 12 in the pressed state, thereby avoiding the generation of a virtual position.

In this embodiment, the first spring 141 is a cylindrical spring or a conical spring disposed at one end of the support link 14, or a torsion spring disposed at the hinge portion of the support link 14.

In the above structure, the first spring 141 is preferably a cylindrical spring.

In this embodiment, a dead point spring 25 located at one side of the swinging end of the bimetal spring 22 is further disposed in the contactor 20; the dead point spring piece 25 is arc-shaped, one end of the dead point spring piece is propped against the inner wall of the contactor 20, and the other end of the dead point spring piece is propped against the swinging end of the bimetal spring piece 22 to generate thrust force towards the fixed end direction of the bimetal spring piece 22; the point of contact between the virtual arc generated by the swinging end of the bimetal elastic piece 22 during swinging and the virtual arc generated by the free end of the dead point elastic piece 25 by taking the end of the dead point elastic piece 25 propped against the inner wall of the contactor 20 as the center of a circle is the dead point position of the swinging end of the bimetal elastic piece 22.

In the above structure, the tangential point of the bimetal spring plate 22 and the dead point spring plate 25 is the dead point position, so that the bimetal spring plate 22 can be ensured to be locked on the normally closed position (the state of fig. 9 and 10) or the normally open position (the state of fig. 11) under the pushing of the dead point spring plate 25, when the bimetal spring plate 22 bends and is locked on the normally open position (the state of fig. 11) due to heat, the force exceeding the dead point position can be larger than the force when the bimetal spring plate 22 swings to the original normally closed position (the state of fig. 9 and 10) due to the fact that the temperature of the bimetal spring plate 22 drops after the circuit is disconnected, the bimetal spring plate 22 is kept on the normally open position (the state of fig. 11) and can enter the normally closed position again (the state of fig. 9) after being pushed by the aid of the control rod 24; the contactor 20 is also provided with a reset spring 26 for assisting in pushing the control rod 24 away from the normally closed position (state of fig. 10).

In this embodiment, the first straight key switch 11 is a normally open switch before being pressed; the second direct key switch 12 comprises a normally open circuit and a normally closed circuit before being pressed, and the normally open circuit is switched on and the normally closed circuit is switched off after the second direct key switch 12 is pressed.

In the above structure, the first straight-key switch 11 is in an on state after being pressed down, the normally open path before being pressed down after the second straight-key switch 12 is pressed down is changed into a normally closed path, the normally closed path is changed into a normally open path, and the first straight-key switch 11 and the second straight-key switch 12 realize current commutation through cable connection.

In this embodiment, the pushing portion 121 is an inclined plane, and the lock tongue 13 is adapted to the inclined plane so as to push the lock tongue 13 into the locking groove 111 to lock the pressing shaft of the first straight key switch 11 when the pressing shaft of the second straight key switch 12 is pressed down; the lock tongue 13 is provided with a second spring 131 for pushing the lock tongue 13 to release from the locking groove 111 and unlock when the pressing shaft of the second straight key switch 12 is reset.

In the above structure, the second spring 131 is used to control the return of the tongue 13.

In this embodiment, the first straight-key switch 11 has a pressing locking function, and the second straight-key switch 12 has no locking function.

In the above-described structure, the first straight key switch 11 is used for normal forward operation of the motor, and therefore is kept in a pressed state by pressing the lock function after being pressed, and is reset after being pressed again; the second straight key switch 12 is used for reversing the motor in locked or blocked operation, so that only click is needed, and the locking function is not needed.

In this embodiment, the middle frame 10 is externally covered with a housing 30, the support link 14 is hinged to the housing 30, one end of the first spring 141 abuts against the support link 14, and the other end abuts against the housing 30; the pressing shafts of the first and second straight- key switches 11 and 12 extend out of the housing 30 and are provided with a pressing cap 31, and the end of the supporting connecting rod 14, which is opposite to the end adapted to the control rod 24, is located outside the housing 30 and abuts against the pressing caps 31 of the first and second straight- key switches 11 and 12.

In the above structure, the cap 31 is provided with the cap edge 311, the end of the support link 14, which is opposite to the end adapted to the control lever 24, is provided with the cross bar 142, and both ends of the cross bar 142 respectively abut against the cap edges 311 of the cap 31 on the first straight key switch 11 and the second straight key switch 12.

In this embodiment, the housing 30 is provided with a key slot 32, the press cap 31 is located in the key slot 32, and a drain 321 is provided on a sidewall of the key slot 32.

In the above structure, when used on the ice crusher, the drain outlet 321 is downward arranged to drain water.

The utility model has the beneficial effects that: the first direct-key switch 11 is used for controlling a first action of a load, the second direct-key switch 12 is used for controlling a second action of the load (the first action and the second action comprise, but are not limited to, forward and reverse rotation when the load is a motor, and control of loads such as a first color temperature and a second color temperature when the load is an LED dual-color temperature light source), when the first direct-key switch 11 is pressed down, the lock tongue 13 locks a pressing shaft of the second direct-key switch 12, so that the second direct-key switch 12 is prevented from being accidentally pressed down, when the second direct-key switch 12 is pressed down, the lock tongue 13 locks the pressing shaft of the first direct-key switch 11, so that the first action and the second action of the load are prevented from being accidentally pressed down, and collision occurs; the contactor 20 is used for controlling the on-off of the current of the first straight key switch 11 and the second straight key switch 12, when the first straight key switch 11 or the second straight key switch 12 is pressed down to cause the load to work, short circuit, locking or locked rotation occurs, at the moment, the current is increased to cause the current bimetal spring plate 22 to generate heat to generate bending, the movable contact 23 is separated from the fixed contact 21 and passes over the dead point position to keep the contactor 20 normally open, and the elasticity of the bimetal spring plate 22 cannot exceed the elasticity passing over the dead point position after the bimetal spring plate 22 is cooled because of the dead point position, so the contactor 20 still keeps normally open; when the first straight key switch 11 or the second straight key switch 12 is pressed down, the control rod 24 assists to push the bimetal elastic sheet 22 to pass through the dead point position, and the contact between the movable contact 23 and the stationary contact 21 is returned to the normally closed state again by means of self elasticity of the bimetal elastic sheet 22 in the cooling state; when the first straight key switch 11 or the second straight key switch 12 is pressed down again, the control rod 24 resets and is far away from the bimetal elastic piece 22, so that a movable space is reserved for disconnecting the movable contact 23 and the fixed contact 21 for the next heating bending of the bimetal elastic piece 22; therefore, the aim that the circuit can be disconnected when any straight key switch is loaded on the premise that the first straight key switch 11 and the second straight key switch 12 are interlocked, so that the contactor 20 enters overload protection and the overload protection of the contactor 20 can be released after the straight key switch is released can be realized; when the motor is applied to an ice crusher, the first direct key switch 11 is pressed to realize the forward rotation of the motor, when the current is increased due to the blocking and blocking of the motor in the forward rotation, the contactor 20 is disconnected, the power supply of the motor is stopped, the contactor 20 returns to the normally closed state again until the first direct key switch 11 is loosened, at the moment, the first direct key switch 11 can be pressed again after the crushed ice is cleaned, or the blocking and blocking state of the motor is released by pressing the second direct key switch 12, if the current is increased due to the blocking and blocking of the motor in the reverse rotation after the second direct key switch 12 is pressed, the contactor 20 is disconnected, the power supply of the motor is stopped, and the contactor 20 returns to the normally closed state again until the second direct key switch 12 is loosened; the safety of the electric equipment can be effectively protected, and overload is avoided.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (10)

1. A control switch, characterized by: the device comprises a first straight key switch and a second straight key switch which are arranged on a middle frame; a lock tongue is arranged between the first straight key switch and the second straight key switch, a locking groove is arranged on a pressing shaft of the first straight key switch, and a pushing part for pushing the lock tongue to enter the locking groove when the second straight key switch is pressed down is arranged on the pressing shaft of the second straight key switch; the double-metal spring plate comprises a normally closed station which enables the movable contact to be in contact with the fixed contact when the double-metal spring plate does not generate heat and a normally open station which enables the movable contact to be separated from the fixed contact and to pass through a dead point position and keep normally open when the double-metal spring plate generates heat; the contactor is also provided with a control rod which enables the bimetal elastic sheet to be kept at the normally-closed station before the first straight-key switch or the second straight-key switch is pressed down, and leaves a movable space from the normally-closed station to the normally-open station when the bimetal elastic sheet heats after the first straight-key switch or the second straight-key switch is pressed down.

2. A control switch as claimed in claim 1, wherein: the middle section of the support connecting rod is a hinge point, one end of the support connecting rod is abutted against the control rod, the other end of the support connecting rod is matched with the first straight-key switch and the second straight-key switch, and the control rod moves towards the direction opposite to the pressing direction of the first straight-key switch or the second straight-key switch when the first straight-key switch or the second straight-key switch is pressed.

3. A control switch as claimed in claim 2, wherein: the support connecting rod is provided with a first spring which enables the swing direction of the support connecting rod to be opposite to the pressing direction of the first straight key switch or the second straight key switch.

4. A control switch as claimed in claim 3, wherein: the first spring is a cylindrical spring or a conical spring arranged at one end of the supporting connecting rod or a torsion spring arranged at the hinge part of the supporting connecting rod.

5. A control switch as claimed in claim 1, wherein: a dead point spring piece positioned at one side of the swinging end of the bimetal spring piece is also arranged in the contactor; the dead point spring plate is arc-shaped, one end of the dead point spring plate is propped against the inner wall of the contactor, and the other end of the dead point spring plate is propped against the swinging end of the bimetal spring plate so as to generate thrust force towards the fixed end direction of the bimetal spring plate; the virtual arc line generated by the swinging end of the bimetal spring plate during swinging and the dead point position of the swinging end of the bimetal spring plate are the tangent points between the virtual arc line generated by taking the end of the dead point spring plate, which is abutted against the inner wall of the contactor, as the circle center.

6. A control switch as claimed in claim 1, wherein: the first straight key switch is a normally open switch before being pressed down; the second straight key switch comprises a normally open circuit and a normally closed circuit before being pressed down, and the normally open circuit is switched on and the normally closed circuit is switched off after the second straight key switch is pressed down.

7. A control switch as claimed in claim 1, wherein: the pushing part is an inclined plane, and the lock tongue is matched with the inclined plane to push the lock tongue to enter the locking groove to lock the pressing shaft of the first straight key switch when the pressing shaft of the second straight key switch is pressed down; the lock tongue is provided with a second spring which pushes the lock tongue to be separated from the locking groove to be unlocked when the pressing shaft of the second straight key switch is reset.

8. A control switch as claimed in claim 1, wherein: the first straight key switch has a pressing locking function, and the second straight key switch has no locking function.

9. A control switch according to claim 2 or 3 or 4, wherein: the middle frame is externally covered with a shell, and the support connecting rod is hinged with the shell; the pressing shafts of the first straight key switch and the second straight key switch extend outwards from the shell and are provided with pressing caps, and one end of the supporting connecting rod, which is back to the control rod and is matched with the control rod, is positioned outside the shell and abuts against the pressing caps of the first straight key switch and the second straight key switch.

10. A control switch as claimed in claim 9, wherein: the shell is provided with a key pressing groove, the pressing cap is positioned in the key pressing groove, and the side wall of the key pressing groove is provided with a water outlet.

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