CN115211736A - Double power-off method, double power-off device and toaster - Google Patents

Abstract

The invention discloses a double power-off method, a double power-off device and a toaster, belonging to food baking equipment.A power supply circuit of a load is difficult to cut off when a lifting frame of the existing toaster is clamped and can not be lifted, and potential safety hazard of overtime work of the load exists; and the lifting member provides the actuating member with a power-off stroke moving from the first position to the second position when the actuating member is located at the first position. When the electromagnet releases the execution component, the lifting component and the execution component are reset, and a power supply circuit of a load is disconnected; if the lifting component is blocked, the executing component can still move the power-off stroke from the first position to the second position to disconnect the first circuit switch, so that the hidden danger that the load continues to work is eliminated, and the function of double power-off is realized.

Description

Double power-off method, double power-off device and toaster

Technical Field

The invention belongs to food baking equipment, and particularly relates to a toaster, which can be powered off doubly when a power supply circuit of a load is disconnected by a double power-off method and a double power-off device, so that reliable power-off is ensured, and the load is prevented from working for a long time.

Background

Toaster, english name Toaster, is called automatic toast oven and Toaster in China, which is an electric heating cooking utensil specially used for toasting sliced bread again. By using the bread slice, the bread slice can be baked to be brown, the fragrance is stronger, the taste is better, and the appetite is promoted. Similarly, other food pieces such as steamed bread pieces can be baked.

The existing toaster is internally provided with a baking cavity, a lifting frame and a load for heating the baking cavity, and a circuit switch for switching on or off a load power supply circuit is also arranged, an electromagnet is arranged on the lifting frame, and the lifting frame comprises a bracket positioned in the baking cavity and a handle extending to the outside. When the bread baking device is powered on for use, the bread slice is placed on the bracket in the baking cavity, the handle is pressed downwards, the whole lifting frame is lowered and is attracted by the electromagnetic force of the electromagnet, the circuit switch is closed when the lifting frame is attracted by the electromagnetic force, the power supply circuit of the load is switched on, and the load works and heats. After the load works according to the gears, the electromagnet releases the lifting frame, the lifting frame lifts the bread slice by the bracket to take food, the lifting frame lifts and simultaneously disconnects a power supply circuit of the load, and the load stops heating.

Because load heating has potential safety hazard, especially when overtime work, the safety risk increases. In practical use, the lifting frame can not be lifted in case of being stuck, the power supply circuit of the load can not be disconnected, and the load can not stop heating, so that accidents can be caused. Therefore, how to disconnect the power supply circuit of the load when the lifting frame is blocked and can not be lifted and stop the heating of the load becomes the safety and functional requirement of the product.

Disclosure of Invention

The technical problem to be solved and the technical task provided by the invention are to provide a double power-off method, a double power-off device and a toaster, so that a power supply circuit of a load can be cut off when a lifting frame is clamped and cannot be lifted, the load stops heating, and the potential safety hazard that the load continues to be heated is eliminated.

To achieve the above object, the dual power-off method of the present invention is characterized in that a power-off operation is performed when a power supply circuit of a load is turned on:

the power supply circuit for switching on the load is characterized in that the actuating component is attracted to a first position by an electromagnet, and the actuating component closes a first circuit switch at the first position;

the power-off action is any one of the following two actions:

(1) When the electromagnet releases the executing component from the first position, the lifting component rises, and the executing component moves from the first position to the second position to disconnect the first circuit switch;

(2) When the electromagnet releases the actuating component from the first position, the lifting component is blocked from rising, and the actuating component moves a power-off stroke relative to the lifting component with blocked rising from the first position to the second position so as to disconnect the first circuit switch;

the first position is a position where the actuating member closes the first circuit switch, and the second position is a position where the actuating member opens the first circuit switch.

Therefore, the function of double power-off is realized, the power supply circuit of the load is ensured to be disconnected, the load stops working, and the hidden danger of overtime working of the load is eliminated.

In order to achieve the above object, the dual power cutoff device of the present invention includes:

a first circuit switch for turning on or off a power supply circuit of a load;

an actively configured actuating member having an active range including a first position closing the first circuit switch and a second position opening the first circuit switch;

a first reset member that provides a force to the actuating member that moves in a direction from the first position to the second position;

a lifting member configured to be lifted and lowered, and configured to press and hold the actuator member to move in a direction from the second position to the first position; when the actuating member is located at the first position, the lifting member provides the actuating member with a power-off stroke moving from the first position to the second position, and the power-off stroke is defined as that the actuating member opens the first circuit switch after moving from the first position to the second position;

a second restoring member that provides a lifting force to the lifting member;

an electromagnet configured to attract the actuating member in the first position with an electromagnetic force or to release the actuating member from the first position by eliminating the electromagnetic force.

The double power-off device provided by the invention has the advantages that the lifting component moves downwards to press the actuating component to move from the second position to the first position, the electromagnet attracts the actuating component to the first position, the actuating component closes the first circuit switch at the first position, the power supply circuit of the load is switched on, and the load works. When the electromagnet eliminates the electromagnetic force to release the executing component from the first position, the executing component is movably reset from the first position to the second position under the action of the first resetting piece to release the lifting component, the first circuit switch is switched off, the power supply circuit of the load is switched off, and the load stops working. The lifting component is lifted and reset under the action of the second resetting piece.

In the prior art, when the electromagnet removes the electromagnetic force to release the actuating member from the first position, if the lifting member cannot be reset, the blocking actuating member is movably reset from the first position to the second position, so that the first circuit switch and the power supply circuit of the load cannot be disconnected, and the load cannot stop working, which causes a safety hazard.

In the invention, because the lifting component provides the actuating component with the power-off stroke moving from the first position to the second position when the actuating component is positioned at the first position, the actuating component can still move the power-off stroke from the first position to the second position to turn off the first circuit switch, the power supply circuit of the load is disconnected, the load stops working, and the hidden trouble that the load continues to work is eliminated. Therefore, the double power-off device realizes the function of double power-off.

In order to ensure the safety of power utilization, the power supply circuit comprises a live wire and a zero wire, and the first circuit switch comprises a live wire switch and a zero wire switch. The live and neutral conductors are thus switched on or off simultaneously by the live and neutral switches. When the device is specifically implemented, the live wire switch and the zero wire switch can be configured in a linkage mode or can be configured independently.

Particularly, the first circuit switch is a normally open switch, the actuating member is provided with a first switch closing part, when the actuating member is located at the first position, the first switch closing part triggers the first circuit switch to close the first circuit switch, and when the actuating member is located at the second position, the first switch closing part leaves the first circuit switch to open the circuit switch. Therefore, the power supply circuit of the load can be kept in an open state, and the power supply circuit is closed and switched on only when the load needs to work, so that the power utilization safety is ensured.

Furthermore, in order to ensure the safety of electricity utilization, a second circuit switch connected in series with the first circuit switch is arranged in the power supply circuit, the second circuit switch is a normally open switch, a second switch closing part is arranged on the lifting member, when the executing member is located at the first position, the second switch closing part triggers the second circuit switch to close the second circuit switch, and when the executing member is located at the second position, the second switch closing part rises along with the lifting member and leaves the second circuit switch, so that the second circuit switch is opened. Therefore, under the normal state, the first circuit switch and the second circuit switch control the on-off of the power supply circuit at two positions of the power supply circuit, and the reliability of the off-circuit is improved.

Preferably, in order to operate stably and reliably and ensure accurate fitting, the actuating member is a swinging member and is configured to swing toward and away from the first circuit switch. Therefore, the movement mode and the direction of the executing component are determined reliably, the executing component does not incline or deviate during swinging, and the executing component can accurately reach the work during swinging. The actuating member is used for closing the first circuit switch when approaching the first circuit switch, and is used for opening the first circuit switch when being far away from the first circuit switch.

The executing component is provided with a first avoiding structure, the lifting component is provided with a second avoiding structure, and the first avoiding structure and the second avoiding structure are matched to provide a power-off stroke for the executing component to move from the first position to the second position. The structure is particularly suitable for the first circuit switch and the second circuit switch which are normally open switches of the same type and specification, and at the moment, the first circuit switch controlled by the execution component and the second circuit switch controlled by the lifting component can be kept to synchronously move and have basically the same movement stroke. If the first circuit switch and the second circuit switch are both microswitches, the microswitches have specified strokes, the switches are turned on and off through deformation of the elastic pieces, the deformation range of the elastic pieces is generally within 3mm, namely, in a natural disconnection state, the elastic pieces are turned on or turned off through deformation not larger than 3 mm. Therefore, the first avoidance structure and the second avoidance structure are matched to realize the power-off stroke, and the power-off stroke control device has the technical advantages of compact structure and sensitive control.

Furthermore, in order to keep the action synchronization of the first circuit switch controlled by the executing component and the action synchronization of the second circuit switch controlled by the lifting component and have basically the same action stroke, the structure is simplified, and the volume is reduced, wherein the first avoiding structure is a sliding block; the second avoidance structure is an inclined plane arranged on the lifting member, and the lifting member is also provided with a pressing part adjacent to the inclined plane; when the actuating member swings, the inclined surface and the pressing part change positions corresponding to the slide block, when the lifting member descends, the pressing part presses the slide block to enable the actuating member to swing from the second position to the first position, when the actuating member is located at the first position, the end part of the slide block corresponds to the inclined surface to provide a power-off stroke for the actuating member to swing from the first position to the second position, and when the actuating member swings in the power-off stroke, the inclined surface pushes the slide block to move. Based on the structure, when the actuating component and the lifting component act synchronously, the position relation of the sliding block, the inclined plane and the pressing and holding part is changed based on the swinging of the actuating component, and the double power-off is realized by the matching of the sliding block and the inclined plane or the pressing and holding part at different positions. The actuator is configured to swing about a swing axis in the lateral direction and the swing causes a change in a projected position of the slider on a horizontal plane, the slider is configured to slide in a direction parallel to the swing axis of the actuator, and the slider is urged by an elastic element in a direction approaching the inclined surface and the pressure holding portion.

The executing component is provided with a constraint hole, and the sliding block is positioned in the constraint hole, so that the sliding block is constrained in a proper moving range, and the sliding block is accurately matched with the inclined plane and the pressing part when swinging along with the executing component.

The executing component is provided with a hook, the hook hooks the lifting component to prevent the lifting component from rising when the executing component is located at the first position, and the hook deviates from the lifting component to allow the lifting component to rise when the executing component swings from the first position to the second position. Also, the lifting member is overlapped with the actuating member while the hook is hooked to the lifting member. Or when the hook hooks the lifting member, the height difference which is not smaller than the power-off stroke is kept between the lifting member and the executing member, and when the electromagnet releases the executing member from the first position, the height difference enables the executing member to move the power-off stroke from the first position to the second position.

Preferably, the first return member is a torsion spring acting on the actuating member.

Preferably, the electromagnet and the first circuit switch are assembled on a bottom plate, a support is arranged on the bottom plate, and the executing component is assembled on the support in a swinging mode through a pin shaft.

Preferably, the lifting member is sleeved on a guide rod, and the second restoring piece is an extension spring connected to the lifting member. In particular, the guide rod is sleeved with a compression spring, the compression spring is positioned on the upper side of the lifting member and applies downward elastic resistance to the lifting member in the lifting stroke of the lifting member, and when the lifting member is lifted and reset under the action of the second reset piece, the compression spring can buffer the impact of the lifting member when the lifting member is lifted and reset.

In order to control the lifting member, the working position of the lifting member is changed timely, the lifting member is restrained by the restrained piece of the lifting member and cannot rise when the actuating member is located at the first position, and the restrained piece of the lifting member is released to enable the lifting member to rise when the actuating member moves from the first position to the second position.

To achieve the above objects, the toaster of the present invention is characterized by performing the dual power-off method of the present invention.

In order to achieve the purpose, the toaster comprises an outer shell, wherein a baking cavity with an opening at the upper end is arranged in the outer shell, and a lifting frame and a load for heating are configured for the baking cavity, and the toaster is characterized in that: the double power-off device is arranged in the shell, the shell is provided with a lifting channel, the lifting frame comprises a bracket and a handle which are connected with the lifting component, the bracket is positioned in the baking cavity, the handle extends out of the shell through the lifting channel, the electromagnet is controlled by a controller and used for sucking the execution component at the first position to connect the power supply circuit and releasing the execution component from the first position according to set conditions to disconnect the power supply circuit. The toaster realizes the function of double power-off by means of the double power-off device.

Preferably, the setting condition is at least one time shift set by a timer.

The double power-off method of the invention is to execute any power-off action when the power supply circuit of the load is switched on: (1) When the electromagnet releases the executing component from the first position, the lifting component rises, and the executing component moves from the first position to the second position to disconnect the first circuit switch; (2) When the electromagnet releases the actuating member from the first position, the lifting member is blocked from lifting, and the actuating member moves relative to the lifting member with blocked lifting from the first position to the second position by a power-off stroke to disconnect the first circuit switch. The power supply circuit realizes the function of double power-off, ensures that the power supply circuit of the load is disconnected, stops the load from working, and eliminates the hidden trouble of overtime work of the load.

The dual-power-off device is formed by the mutually matched execution component and lifting component and the matched electromagnet, and can realize the dual-power-off function according to the dual-power-off method action.

The double power-off method and the double power-off device can be applied to the toaster, and the double power-off function of the toaster is realized.

Drawings

FIG. 1 is an isometric view of a toaster according to the present invention;

FIG. 2 is a schematic view of the toaster of FIG. 1 with an outer cover removed;

FIG. 3 is a schematic view of the dual power cutoff device of the present invention in cooperation with a crane;

figure 4 is a schematic view of the crane of figure 3 after it has been raised;

FIG. 5 is a schematic diagram of the dual power cutoff device of the present invention in a closed power supply circuit;

FIG. 6 is a schematic view of another perspective of the structure shown in FIG. 5;

FIG. 7 is a schematic view of the actuator of FIG. 6 with the actuator removed;

FIG. 8 is an enlarged view of portion A of FIG. 7;

FIG. 9 is a schematic diagram of the dual power cutoff device of the present invention in the open power circuit state;

FIG. 10 is a schematic view of the actuator shown in FIG. 9 with the actuator removed;

FIG. 11 is a schematic view from another perspective of the structure shown in FIG. 10;

FIG. 12 is an enlarged view of the portion B of FIG. 11;

FIG. 13 is a schematic diagram showing the positional relationship between the slider and the inclined surface and the pressing portion when the actuator is at the first position;

FIG. 14 is a schematic diagram showing the positional relationship between the slider, the inclined surface and the pressing portion after the lifting member moves away from the first position along with the actuating member according to the present invention;

FIG. 15 is a schematic diagram of a load supply circuit of the present invention;

the numbering in the figures illustrates:

100 casing, 101 lifting channel;

200 of inner container;

300 a base;

400 a baking cavity;

500, lifting frame: 501 bracket, 502 handle;

600 load;

710 live, 720 neutral;

800 double power-off device:

810 a first circuit switch, 811 a hot switch, 812 a neutral switch, 813 a first contact, 814 a spring, 815 a second contact,

820 actuating member, 821 first switch closing part, 822 first avoiding structure, 823 restraining hole, 824 hook, 825 elastic element, 826 pin shaft

830 a first restoring member, and a second restoring member,

840 lifting member, 841 second switch closing part, 842 second avoiding structure, 843 pressing part, 845 guiding rod, 846 compressing spring,

850 a second restoring member, which is provided with a second restoring member,

860 an electromagnet, and a power supply unit,

870 second of the plurality of circuit switches for switching,

880 bottom plate, 881 stand;

900 knob switch.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention are intended to cover a non-exclusive inclusion, such that a method or article of manufacture that comprises a list of features does not have to be limited to those features expressly listed, but may include other features not expressly listed that may be included in the method or article of manufacture.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The vertical direction is consistent with the directions of 'up' and 'down', the directions of 'up' and 'down' are opposite, the directions of 'left' and 'right' are opposite, and the directions of 'front' and 'rear' are opposite.

In the description of the present invention, it should be understood that the technical features defined by the terms "first", "second", etc. have sequential concepts, only in order to clearly describe the defined technical features, so that the defined technical features can be clearly distinguished from other technical features, and do not represent such naming in actual practice, and thus, should not be construed as limiting the present invention.

The present invention will be described in detail with reference to the following embodiments and accompanying drawings.

The toaster shown in fig. 1-2 comprises a housing 100, an inner container 200, and a base 300, wherein the inner container 200 is located in the housing 100, and the housing 100 and the inner container 200 are located on the base 300 and kept assembled with the base. A baking chamber 400 with an open upper end is arranged in the inner container 200, and the baking chamber 400 is also positioned in the outer shell 100. The oven cavity 400 is provided with a crane 500 and a load 600 for heating. To facilitate assembly, the crane 500 is an assembled structure. The load 600 is a heating resistor distributed on the sidewall of the baking chamber, and is used for all-around baking of the bread slice in the baking chamber. The casing 100 and the inner container 200 are provided with a lifting passage, which is a slit extending vertically. The crane 500 comprises a lifting member 840, a bracket 501 connected with the lifting member and a handle 502. The elevating member 840 is positioned in an interlayer between the front side of the inner container 200 and the outer case 100. The bracket 501 is located in the baking chamber 400 and connected with the lifting member through the lifting channel of the inner container. The handle 502 extends out of the housing through the hoistway 101 of the housing. A double power-off device 800 is disposed at the bottom of the interlayer between the front side of the inner container and the outer case.

As shown in fig. 3 to 15, the double power cutoff device 800 includes: a first circuit switch 810, a second circuit switch 870, an actuating member 820, a first reset piece 830, a lifting member 840, a second reset piece 850, an electromagnet 860 and a bottom plate 880.

The bottom plate 880 is a flat plate, on which the bracket 881 is assembled, and the bottom plate is fixedly assembled on the base to configure the entire dual power-off device on the toaster.

A first circuit switch 810 is mounted to the backplane 880 for switching on or off a power supply circuit of the load 600 shown in fig. 15, the power supply circuit including a live switch 810 and a neutral switch 720, the first circuit switch 810 including a live switch 811 and a neutral switch 812. And the live wire switch and the zero wire switch are both normally-open micro switches. As shown in fig. 10, the micro switch has a first contact 813 fixed on the bottom plate 880 and a second contact 815 provided on the spring plate 814, and the first contact and the second contact are not contacted to disconnect the circuit in a normal state. The second contact can contact the first contact to connect the circuit through the downward elastic deformation of the elastic sheet.

A second circuit switch 870 is also mounted to the backplane 880 and is in series with the first circuit switch, specifically in the hot line with the hot switch as shown in fig. 15. The second circuit switch is also a normally open microswitch and has the same structure as the live wire switch.

The actuating member 820 is generally in the form of a plate, which is a swinging member and is swingably mounted to the bracket 881 via a pin 826 extending in the left-right direction, and is configured to swing toward and away from the first circuit switch. The actuator 820 is provided with a first switch closing part 821 for closing or opening the first circuit switch. As shown, the first switch closing part 821 corresponds to the first switch, and the lower ends of the two posts are respectively directed to the elastic pieces of the live wire switch and the neutral wire switch one by one. The movable range of the actuating member includes a first position where the first circuit switch is closed and a second position where the first circuit switch is opened, along with the swing of the actuating member. When the actuator 820 is located at the first position as shown in fig. 5-8 and 13, the first switch closing part 821 triggers the first circuit switch 810 to close the first circuit switch, and when the actuator 820 is located at the second position as shown in fig. 9-12 and 14, the first switch closing part 821 is separated from the first circuit switch to open the first circuit switch.

One end (i.e., the front end) of the actuating member 820 far away from the pin shaft fixes the magnetic attraction body.

The upper side of the actuating member 820 is provided with a first avoidance structure 822, which is a slider. Specifically, the upper side of the actuating member 820 is provided with a constraint hole 823, and the slider 822 is located in the constraint hole 823 and can slide along a direction parallel to the axis of the pin shaft, that is, can slide left and right. The slider is urged rightward by a helical compression spring as the elastic member 825. In fig. 8, the left end of the slide block has a larger profile, so that the slide block can be prevented from being removed from the constraining hole to the right. As shown in fig. 13-14, the projected position of the slider on the horizontal plane changes as the slider oscillates with the actuator.

The actuating member 820 is also provided with a hook 824 at an upper side thereof.

The first restoring member 830 is a torsion spring, the middle portion of which is sleeved on the pin 826, and both ends of which are supported on the actuating member 820 and the bracket 881, respectively, so as to provide a force for the actuating member to move in a direction from the first position to the second position. In other words, the elastic force is applied to the actuating member to make the actuating member swing upwards.

The lifting member 840 is a constituent of a lifting frame. The elevation member 840 is fitted over a guide bar 845 which is elevated along the elevation member, and the guide bar is fitted over a compression spring 846, the compression spring 846 being located at an upper side of the elevation member 840 and applying a downward elastic resistance to the elevation member during an elevation stroke of the elevation member.

In the positional relationship, the elevating member 840 is configured to swing the pressing and holding member 820 from the second position toward the first position when descending; when the actuating member 82 is located at the first position, the actuating member restrains the lifting member to prevent the lifting member from ascending, and the lifting member provides the actuating member with a power-off stroke moving from the first position to the second position, wherein the power-off stroke is defined as that the actuating member opens the first circuit switch after moving from the first position to the second position; the actuating member releases the lifting member when the actuating member moves in a direction from the first position to the second position.

Wherein the actuator restrains the lifting member from rising when the actuator is in the first position is achieved by the hook 824 hooking the lifting member 840 to prevent the lifting member from rising. In the illustrated embodiment, the lifting member is overlapped with the actuating member while the hook hooks the lifting member. The lifting member is released by the actuating member when the actuating member moves from the first position to the second position, and the hook 824 is deviated from the lifting member 840 to lift the lifting member when the actuating member 820 swings from the first position to the second position.

The elevation member 840 is provided with a second switch closing part 841, the second switch closing part 841 is in the form of a pillar like the first switch closing part and a lower end of the pillar is directed to a spring plate of the second circuit switch 870. When the actuating member 820 is located at the first position shown in fig. 5-8 and 13, the second switch closing portion triggers the second circuit switch to close the second circuit switch, and when the actuating member is located at the second position shown in fig. 9-12 and 14, the second switch closing portion ascends along with the lifting member and leaves the second circuit switch, so that the second circuit switch is opened.

The lifting member 840 is provided with a second avoidance structure 842, which is an inclined surface arranged on the lifting member. The inclined direction of the inclined plane is configured to be that the lower end of the inclined plane is far away from the sliding block and the upper end of the inclined plane is close to the sliding block on the projection of a horizontal plane. The lifting member is further provided with a pressing portion 843 juxtaposed to the inclined surface.

The slider changes the position corresponding to the inclined surface and the pressure-holding portion when the actuator 820 swings. When the lifting member descends as shown in fig. 9-12 and 14, the pressing portion 843 presses and holds the slider to swing the actuating member from the second position to the first position, when the actuating member is located at the first position as shown in fig. 5-8 and 13, the end portion of the slider corresponds to the inclined surface to provide a power-off stroke for the actuating member to swing from the first position to the second position, and when the actuating member swings in the power-off stroke, the inclined surface pushes the slider to move leftwards. Thus, the first avoidance structure and the second avoidance structure cooperate to provide the actuating member with a de-energizing stroke that is movable in a direction from the first position to the second position.

The second restoring member 850 is an extension spring connected to the elevating member, and specifically, the lower end of the extension spring is connected to the elevating member 840, and the upper end of the extension spring is connected to the outer wall of the inner container 200. The second restoring member provides a lifting force to the lifting member.

The electromagnet 860 is fixed to the base 880, and generates an electromagnetic force when the electromagnet is energized and disappears when the electromagnet is de-energized. Thus, the position of the electromagnet is configured to magnetically attract the actuating member in the first position or to release the actuating member from the first position when the electromagnetic force is removed.

In particular, the electromagnet is controlled by the controller to attract the actuating member in the first position to close the power supply circuit and to release the actuating member from the first position to open the power supply circuit according to the set conditions. Furthermore, the setting condition is at least one time shift set by the timer, and the time shift can be configured as a knob switch or a plurality of keys for the user to set the shift. When the power is supplied, once the actuating component approaches the electromagnet, the electromagnet attracts the actuating component and keeps the actuating component at the first position, and a power supply circuit of the load is switched on to enable the load to work. When the load works according to the time corresponding to the set gear, the electromagnet is powered off, and the executing component is released, so that the power supply circuit of the load is disconnected, and the load stops working.

In view of the above-described dual power cutoff device and the toaster, the crane 500 and the actuator 820 are located at their respective high positions during standby, and the power supply circuit of the load is disconnected.

During operation, the bread slice is placed on the bracket in the baking cavity, the handle is pressed downwards, the lifting frame descends, and the bread slice is lowered to the baking cavity. During the descending process of the lifting frame, particularly when the lifting component of the lifting frame descends to the lower position shown in figures 9-12 and 14, the pressing and holding part 843 presses the sliding block to enable the executing component to swing downwards until the executing component is attracted by the electromagnetic force of the electromagnet and is kept at the first position shown in figures 5-8 and 13. In fig. 1, the direction of movement of the handle is shown by an arrow and a further position of the handle is shown by a broken line.

When the executing member 820 is located at the first position, the first circuit switch and the second circuit switch are both closed and connected to the circuit, the power supply circuit of the load is closed, and the load works. The pressure holding portion is offset from the slider as shown in fig. 8 and 13, and the inclined surface faces the slider.

And when the actuating member is at the first position, the hook 824 hooks the elevating member 840 to prevent the elevating member from rising, so as to keep the bread slice in the toasting cavity for toasting.

When the load works according to the preset time corresponding to the selected gear, the electromagnet is powered off, the electromagnetic force disappears, the executing component swings upwards under the action of the elastic force of the first resetting piece, the lifting component slides upwards along the guide rod under the action of the elastic force of the second resetting piece, the hook 824 deviates from the lifting component 840, the first circuit switch and the second circuit switch are both disconnected from the circuit where the first circuit switch and the second circuit switch are located, the power supply circuit of the load is disconnected, and the load stops working.

When the electromagnet is powered off and the lifting frame is blocked and cannot lift, as shown in fig. 8, the inclined plane faces the sliding block, the executing component swings upwards under the action of the elastic force of the first resetting piece, the sliding block is pushed by the inclined plane to move leftwards, the executing component can swing upwards by a certain amplitude, the swing amplitude is not less than the power-off stroke, and even if the second circuit switch is in a closed state, the first circuit switch disconnects a power supply circuit of the load, so that the load stops working. Thereby implementing a dual power-off function.

As described above, the core of the present invention is that after the electromagnet is powered off, if the lifting member cannot lift, an upward moving power-off stroke is provided for the actuating member, so that the first circuit switch can disconnect the power supply circuit of the load.

Therefore, the present invention provides the following dual power-off method: namely, the power-off action is executed when the power supply circuit of the load is switched on:

the power supply circuit for connecting the load is to attract the actuating member to a first position by an electromagnet, and the actuating member opens and closes the first circuit at the first position and restrains the lifting member to prevent the lifting member from ascending;

the power-off action is any one of the following two actions:

(1) When the electromagnet releases the executing component from the first position, the lifting component rises, and the executing component moves from the first position to the second position to disconnect the first circuit switch;

(2) When the electromagnet releases the actuating component from the first position, the lifting component is blocked from rising, and the actuating component moves a power-off stroke relative to the lifting component with blocked rising from the first position to the second position so as to disconnect the first circuit switch;

the first position is a position where the actuating member closes the first circuit switch, and the second position is a position where the actuating member opens the first circuit switch.

The double power-off method is applied to the toaster, and the toaster is enabled to execute the double power-off method, namely the double power-off function of the toaster is realized.

In the foregoing embodiment, when the power supply circuit of the load is turned on, the lifting member and the actuating member are stacked together, that is, the lifting member and the actuating member are maintained in a position state of substantially contacting each other, and when the actuating member is attracted by the electromagnet, the lifting member does not perform a lifting action, and the second circuit switch is also closed. The power-off stroke of the executing component is realized by the matching of the slide block and the inclined plane.

In other implementations, the de-energizing stroke of the actuating member may also be achieved by the following mating structures: when the hook hooks the lifting component, the height difference which is not less than the power-off stroke is kept between the lifting component and the executing component, and when the electromagnet releases the executing component from the first position, the height difference enables the executing component to move in the direction from the first position to the second position for the power-off stroke. In contrast to the illustrated construction, in which the hook is raised, when the actuating member is attracted by the electromagnet, the first circuit switch is closed, the lever handle is released, the lifting member is subjected to a lifting return movement, which is not less than the power-off movement, and the lifting member is then hooked by the hook. When the electromagnet releases the executing component and the ascending component is blocked and can not ascend and reset, the executing component can still swing upwards to execute a power-off stroke and disconnect the first circuit switch and a power supply circuit of the load. Wherein, the lifting component has a lifting reset action after the actuating component is sucked by the electromagnet, so that the second circuit switch can be disconnected. In order to avoid the disconnection of the second circuit switch when the circuit needs to be switched on, the elastic deformation capacity of the elastic sheet of the second circuit switch can be increased, the elastic range of the elastic sheet for switching on the second circuit switch is enlarged, and the second circuit switch is still closed after the lifting member is lifted and reset. Alternatively, the second circuit switch is omitted and the line at the second circuit switch is kept in an on state.

In the case of a toaster, when the circuit is turned on and the load is operating, the load heats the bread slice, and therefore the crane should be in a lower position to hold the bread slice in the toasting chamber by the carriage. In order to hold the bread slice in the toasting cavity by the bracket, the illustrated structure illustrates that the lifting member is hooked by the hook as a restraining member to restrain the lifting member from rising when the actuating member is located at the first position. The hook has a simple structure and is suitable for saving the manufacturing cost. In specific implementation, in order to keep the bread slice in the baking cavity by the bracket, other structures can be adopted, such as a measure that an execution component is sucked by an electromagnet: when the actuating component is located at the first position, the lifting component is attracted by the electromagnet serving as the restraint piece and cannot lift, and when the actuating component moves from the first position to the second position, the lifting component is released by the electromagnet serving as the restraint piece, so that the lifting component lifts. When the actuating member moves from the first position to the second position, the lifting member is released and synchronously lifted to reset, and the bracket lifts the bread slice for eating. The electromagnet for attracting the lifting member may be shared with the actuator or may be separately provided.

Claims (21)

1. Double power-off method, characterized in that it performs the power-off action when switching on the power supply circuit of the load (600):

the power supply circuit for switching on the load is characterized in that the actuating component (820) is attracted to a first position by the electromagnet (860), and the actuating component (820) closes the first circuit switch (810) at the first position;

the power-off action is any one of the following two actions:

(1) When the electromagnet (860) releases the actuating member (820) from the first position, the lifting member (840) rises, and the actuating member (820) moves from the first position to the second position to disconnect the first circuit switch (810);

(2) When the electromagnet (860) releases the actuating member (820) from the first position, the lifting member (840) is prevented from lifting, and the actuating member (820) moves relative to the lifting member with the prevented lifting from the first position to the second position to break the first circuit switch;

the first position is a position where the actuating member closes the first circuit switch, and the second position is a position where the actuating member opens the first circuit switch.

2. Dual outage device, characterized by includes:

a first circuit switch (810) for switching on or off a power supply circuit of the load (600);

an actively configured actuating member (820) having a range of motion including a first position closing the first circuit switch (810) and a second position opening the first circuit switch;

a first reset (830) that provides a force to the actuating member (820) that is movable in a direction from the first position to the second position;

a lifting member (830) configured to be lifted and lowered, and configured to press and hold the actuating member (820) to move in a direction from the second position to the first position; the lifting member provides the actuating member with a power-off stroke moving from the first position to the second position when the actuating member (820) is in the first position, and the power-off stroke is defined as that the actuating member opens the first circuit switch after moving from the first position to the second position;

a second restoring member (850) providing a lifting force to the lifting member;

an electromagnet (860) configured to attract the actuating member in the first position with an electromagnetic force or to release the actuating member from the first position by eliminating the electromagnetic force.

3. A dual power disconnect device as defined in claim 2, wherein: the power supply circuit comprises a live wire (710) and a neutral wire (720), and the first circuit switch comprises a live wire switch (811) and a neutral wire switch (812).

4. A dual power cutoff device according to claim 2 or 3, wherein: the first circuit switch is a normally open switch, a first switch closing part (821) is arranged on the execution component, when the execution component (820) is located at the first position, the first switch closing part (821) triggers the first circuit switch (810) to close the first circuit switch, and when the execution component is located at the second position, the first switch closing part leaves the first circuit switch to open the circuit switch.

5. The dual power cutoff device of claim 4, wherein: a second circuit switch (870) connected with the first circuit switch in series is arranged in the power supply circuit, the second circuit switch is a normally open switch, a second switch closing part (841) is arranged on the lifting member (840), the second switch closing part (841) triggers the second circuit switch (870) to close the second circuit switch when the executing member is located at the first position, and the second switch closing part rises along with the lifting member and leaves the second circuit switch to open the second circuit switch when the executing member is located at the second position.

6. The dual power cutoff device of claim 2, wherein: the actuating member (820) is a pendulum and is configured to swing toward and away from the first circuit switch.

7. The dual power cutoff device of claim 6, wherein: the actuating member (820) is provided with a first avoidance structure (822), the lifting member (840) is provided with a second avoidance structure (842), and the first avoidance structure and the second avoidance structure are matched to provide the actuating member with a power-off stroke moving from the first position to the second position.

8. The dual power cutoff device of claim 7, wherein:

the first avoidance structure (822) is a sliding block;

the second avoidance structure (842) is an inclined plane arranged on the lifting member, and the lifting member is also provided with a pressing part (843) which is parallel to the inclined plane;

when the executing component (820) swings, the slide block changes the corresponding position of the inclined surface and the pressing part, when the lifting component (840) descends, the pressing part (843) presses the slide block to enable the executing component to swing from the second position to the first position, when the executing component is located at the first position, the end part of the slide block corresponds to the inclined surface to provide a power-off stroke for the executing component to swing from the first position to the second position, and when the executing component swings in the power-off stroke, the inclined surface pushes the slide block to move.

9. The dual power cutoff device of claim 8, wherein: the actuating member (820) is configured to swing about a swing axis in a lateral direction and the swing causes a change in a projected position of the slider on a horizontal plane, a sliding direction of the slider is configured to be parallel to the swing axis of the actuating member, and the slider is urged by an elastic element (825) in a direction approaching the inclined surface and the pressure-holding portion.

10. The dual power cutoff device of claim 9, wherein: and the executing component (820) is provided with a constraint hole (823), and the sliding block is positioned in the constraint hole.

11. The dual power cutoff device of claim 6, wherein: the executing component (820) is provided with a hook (824), when the executing component is located at the first position, the hook (824) hooks the lifting component (840) to prevent the lifting component from rising, and when the executing component (820) swings from the first position to the second position, the hook (824) deviates from the lifting component (840) to allow the lifting component to rise.

12. The dual power cutoff device of claim 6, wherein: the lifting member is overlapped with the performing member when the hook (824) hooks the lifting member (840).

13. The dual power cutoff device of claim 6, wherein: when the hook hooks the lifting member, a height difference which is not smaller than the power-off stroke is kept between the lifting member and the executing member, and when the electromagnet releases the executing member from the first position, the height difference enables the executing member to move the power-off stroke from the first position to the second position.

14. The dual power cutoff device of claim 6, wherein: the first reset member (830) is a torsion spring acting on the actuating member.

15. The dual power cutoff device of claim 6, wherein: the electromagnet (860) and the first circuit switch (810) are assembled on a bottom plate (880), a support (881) is arranged on the bottom plate (880), and the execution component is assembled on the support (881) through a pin shaft (826) in a swinging mode.

16. The dual power cutoff device of claim 2, wherein: the lifting member (840) is sleeved on a guide rod (845), and the second resetting piece (850) is an extension spring connected to the lifting member.

17. A dual power disconnect device as defined in claim 16 wherein: the guide rod (845) is sleeved with a compression spring (846) which is positioned at the upper side of the lifting member (840) and applies downward elastic resistance to the lifting member in the lifting stroke of the lifting member.

18. The dual power cutoff device of claim 2, wherein: when the actuating member (820) is located at the first position, the lifting member (840) cannot be lifted by the constrained part, and when the actuating member (820) moves from the first position to the second position, the lifting member (840) is released by the constrained part and is lifted by the lifting member.

19. The toaster is characterized in that: the dual power-down method of claim 1 is performed.

20. Toaster, including shell (100), be equipped with the open chamber of toasting (400) in upper end in the shell, for toast chamber configuration crane (500) and be used for load (600) of heating, characterized by: the double power-off device (800) as claimed in any one of claims 2-18 is disposed in the casing (100), the casing (100) is provided with a lifting channel (101), the lifting frame (500) comprises a bracket (501) and a handle (502) which are connected with the lifting member (840), the bracket (501) is located in the baking chamber (400), the handle (502) extends out of the casing (100) through the lifting channel (101), and the electromagnet (860) is controlled by a controller and is used for sucking the actuating member at the first position to switch on the power supply circuit and releasing the actuating member from the first position according to a set condition to switch off the power supply circuit.

21. The toaster as set forth in claim 20 wherein: the setting condition is at least one time step set by a timer.

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