阅读说明：本技术 一种冰箱门自动开关装置 (Automatic opening and closing device for refrigerator door ) 是由 熊志生 吴俊锋 于 2020-12-14 设计创作，主要内容包括：本发明属于家电技术领域,具体涉及一种冰箱门自动开关装置。该装置包括磁力顶出机构、上磁力悬浮机构、下磁力悬浮机构、旋转执行机构。磁力顶出机构开门时利用同性磁极相斥原理提供顶出力,关门时利用异性磁极相吸原理提供吸引力。上磁力悬浮机构和下磁力悬浮机构共同给冰箱门体提供向上的磁力作用,减轻机械摩擦阻力,减小旋转执行机构的负担。旋转执行机构驱动冰箱门体相对冰箱箱体旋转,完成冰箱门体的开关。本发明简化整体设计,降低了制造成本,提高了整体可靠性；另外,大幅度的减小了冰箱门体铰链副之间的摩檫力,降低了执行机构的工作噪音,实现了静音化设计,满足冰箱等家电严苛的噪音要求。(The invention belongs to the technical field of household appliances, and particularly relates to an automatic opening and closing device for a refrigerator door. The device comprises a magnetic ejection mechanism, an upper magnetic suspension mechanism, a lower magnetic suspension mechanism and a rotary actuating mechanism. The magnetic ejection mechanism provides ejection force by utilizing the principle that like magnetic poles repel each other when the door is opened, and provides attraction force by utilizing the principle that opposite magnetic poles attract each other when the door is closed. The upper magnetic suspension mechanism and the lower magnetic suspension mechanism provide upward magnetic force for the refrigerator door body together, mechanical friction resistance is reduced, and burden of the rotary actuating mechanism is reduced. The rotary actuating mechanism drives the refrigerator door body to rotate relative to the refrigerator body, and the opening and closing of the refrigerator door body are completed. The invention simplifies the whole design, reduces the manufacturing cost and improves the whole reliability; in addition, friction force between the hinge pairs of the refrigerator door body is greatly reduced, working noise of the actuating mechanism is reduced, a mute design is realized, and the harsh noise requirements of household appliances such as refrigerators are met.)

1. The utility model provides a refrigerator door automatic switch device which characterized in that: comprises a magnetic ejection mechanism (1), an upper magnetic suspension mechanism (2), a lower magnetic suspension mechanism (3) and a rotary actuating mechanism (4);

the magnetic ejection mechanism (1) is composed of a pair of magnets, wherein one magnet is fixed on the refrigerator door body and is marked as a first magnet (11), the other magnet is fixed on the refrigerator body and is marked as a second magnet (12), the two magnets are opposite in position, and at least one of the two magnets is an electromagnet;

the upper magnetic suspension mechanism (2) is arranged at the hinged position of the upper part of the refrigerator door body and the upper part of the refrigerator box body; the lower magnetic suspension mechanism (3) is arranged at the hinged position of the lower part of the refrigerator door body and the lower part of the refrigerator box body; the upper magnetic suspension mechanism (2) and the lower magnetic suspension mechanism (3) jointly provide an upward magnetic force effect for the refrigerator door body, and the magnetic force effect overcomes all or part of gravity of the refrigerator door body; the rotary actuating mechanism (4) drives the refrigerator door body to rotate relative to the refrigerator body.

2. The automatic opening and closing apparatus of a refrigerator door according to claim 1, wherein: the first magnet (11) is a permanent magnet, and the second magnet (12) is an electromagnet.

3. The automatic opening and closing apparatus of a refrigerator door according to claim 2, wherein: the upper part and the lower part of the refrigerator door body are both provided with the magnetic ejection mechanism (1), and the first magnet (11) is fixed on one side far away from the hinge joint of the door body.

4. The automatic opening and closing apparatus of a refrigerator door according to claim 1, wherein: the upper magnetic suspension mechanism (2) comprises a protective sleeve (21), an electromagnet ring (22) and a permanent magnet ring (23); the protective sleeve (21) is cylindrical, the electromagnet ring (22) is fixed in the protective sleeve (21), and the permanent magnet ring (23) is connected in the protective sleeve (21) through a needle bearing; the permanent magnet ring (23) is positioned below the electromagnet ring (22), a gap is reserved between the permanent magnet ring (23) and the electromagnet ring (22), and the permanent magnet ring (23) can float up and down relative to the electromagnet ring (22); the refrigerator door rotating shaft is fixed in the permanent magnet ring (23), and an output shaft of the rotary actuating mechanism (4) penetrates through the electromagnet ring (22) downwards to be connected with the refrigerator door rotating shaft in a matched mode.

5. The automatic opening and closing apparatus of a refrigerator door according to claim 1, wherein: the lower magnetic suspension mechanism (3) comprises a dustproof sleeve (31), a permanent magnet support ring (33), a butterfly spring piece (35), an electromagnet support seat (36) and an iron core (37); the iron core (37) is fixed in the center of the electromagnet support seat (36), the dustproof sleeve (31) is fixed on the electromagnet support seat (36), the permanent magnet support ring (33) is rotatably arranged in the dustproof sleeve (31), a needle bearing is connected between the permanent magnet support ring (33) and the inner wall of the dustproof sleeve (31), and a needle bearing is connected between the permanent magnet support ring (33) and the iron core (37); the permanent magnet support ring (33) can float up and down for a certain distance relative to the electromagnet support seat (36); a butterfly spring piece (35) is padded between the permanent magnet support ring (33) and the electromagnet support seat (36); and a refrigerator door rotating shaft is fixed in the permanent magnet support ring (33).

6. The automatic opening and closing apparatus of a refrigerator door according to claim 1, wherein: the rotary executing mechanism (4) comprises a shell (41), a speed reducing motor (42), a worm (43), a worm wheel (44) and an output shaft (45); the shell (41) is fixed on a refrigerator body, the speed reducing motor (42) is fixed in the shell (41), and the worm (43) is in power connection with the speed reducing motor (42); the output shaft (45) is rotatably arranged in the shell (41), and the worm wheel (44) is fixed on the output shaft (45); the worm wheel (44) is meshed with the worm (43); the output shaft (45) drives the rotating shaft of the refrigerator door body to rotate.

7. The automatic opening and closing apparatus of a refrigerator door according to claim 6, wherein: and an electromagnetic clutch (46) is also connected in series between the worm (43) and the speed reducing motor (42).

8. The automatic opening and closing apparatus of a refrigerator door according to claim 6, wherein: the worm wheel (44) is provided with 3 through holes (441) which are uniformly distributed within 120 degrees; 5 light-emitting diodes which are uniformly distributed within 240 degrees and 5 photosensitive diodes which are uniformly distributed within 240 degrees are fixed in the shell (41); the positions of the light emitting diodes and the positions of the photosensitive diodes are in one-to-one correspondence; light emitted from the light emitting diode may be irradiated to a corresponding photodiode through the through hole (441).

Technical Field

The invention belongs to the technical field of household appliances, and particularly relates to an automatic opening and closing device for a refrigerator door.

Background

At present, medium and high-grade refrigerators in the market are relatively large, door bodies, load weights of the door bodies and door seal suction of the door bodies or drawer type door bodies are large, and more users feed back refrigerator door bodies to be opened difficultly.

The opening of the refrigerator door is generally divided into three stages. The first stage is that when the automatic door is opened, the forces such as door seal suction force, door locking force, door hinge friction force and the like are mainly overcome, the force required to be overcome in the first stage is the largest, and the force value required is at least 60N through measurement; the friction force of a door hinge is mainly overcome in the door opening process in the second stage, the force to be overcome in this stage is the minimum, and the tension value is between 3 and 5N after the measurement and summary of multiple items of data; when the door body is automatically closed in the third stage, the locking force, the hinge friction force and other forces of the automatic closing are mainly overcome. When a user opens the refrigeration door, the refrigerator door is opened too hard, and even the refrigerator body tilts forward and shakes too hard; if the force is too small, the refrigerator door cannot be opened. The door opening mechanism in the current market is mainly a partially opened electric mechanism, namely, a door body is opened to a certain angle and then manually opened to the maximum state, and the third stage of closing the refrigerator door needs manual closing by a user. If the whole door opening and closing process is realized by adopting the rotating mechanism, the requirement on the output torque value of the driving motor is very high, and a gear mechanism is required to realize speed reduction to amplify the torque. The prior market also has an automatic door opening and closing device which comprises a push rod mechanism and a rotating mechanism, wherein in the automatic door opening process, the refrigerator door is opened to a certain angle through the push rod mechanism, and then the rotating mechanism is involved to open the refrigerator door to a required angle; and for the door closing process, the whole door closing process is realized by completely depending on the rotating actuator mechanism to rotate the hinge.

The chinese patent application with application publication No. CN107655255A discloses an automatic door opening device and a refrigerator with the same, wherein the ejection mechanism comprises a dc motor, the output end of the dc motor is provided with a speed reduction part, the speed reduction part comprises a transmission gear, a transmission gear is engaged with a rack, the rack is connected with one end of an ejection rod, and the other end of the ejection rod is in contact with a refrigerator door. By arranging the rack and the ejector rod, the transmission gear drives the rack to move in the process of the movement of the speed reduction part, and the ejector rod is driven by the rack to move outwards, so that the refrigerator door is separated from the refrigerator body and is in an open state by suction force; the rotating mechanism comprises a hinge fixedly connected with the refrigerator door, an overload protector is arranged at the top of the hinge, the other end of the overload protector is connected with an output shaft of the speed reducing motor, a fixing plate is arranged between the overload protector and the speed reducing motor, and one end of the fixing plate is fixedly connected with the refrigerator body. By arranging the overload protector, the safety of the mechanism can be protected under the condition of meeting external super-large torque; when the force allowed by the overload protector is exceeded, two ends of the overload protector rotate relatively, so that structural damage caused by large force is avoided; through setting up the hinge on the refrigerator door, the fixed plate setting can drive the hinge motion in gear motor motion process and realize opening and closing of refrigerator door in the refrigerator main part. Currently, whether the door of the refrigerator is opened or closed, the ejection mechanism needs to give a large ejection force to overcome the door opening resistance, and usually needs to be more than 60N. For the current cross refrigerator, the rotating mechanism needs to overcome the resistance of the upper baffle plate of the refrigerator door, the friction force of the hinge and the locking force of the locking mechanism of the refrigerator door, and needs a larger torque which can be realized only by at least 5 N.m. Therefore, in order to realize the ejection force, the ejector rod mechanism needs a set of speed reducing motor and a gear rack transmission mechanism; for the rotating mechanism, factors such as the integral installation size and working noise are considered, a micro motor with smaller output torque is usually selected, a set of complex gear transmission mechanism is needed to realize that the large transmission ratio reaches the preset output torque, severe challenges are brought to the type selection of the gear and the integral transmission reliability and service life of the rotating mechanism, and the problems of complex assembly process and high realization automation cost are also brought; in addition, since the household appliances such as the refrigerator are placed in a relatively closed area such as a kitchen, the user is very sensitive to working noise/frequency and the like, the number of transmission mechanisms is large, and the rotating mechanism with a complex structure is difficult to meet the expectations of the customer.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an automatic opening and closing device for a refrigerator door.

In order to achieve the purpose, the invention is realized by the following technical scheme: an automatic opening and closing device for a refrigerator door comprises a magnetic ejection mechanism, an upper magnetic suspension mechanism, a lower magnetic suspension mechanism and a rotary actuating mechanism.

The magnetic ejection mechanism is composed of a pair of magnets, wherein one magnet is fixed on the refrigerator door body and marked as a first magnet, the other magnet is fixed on the refrigerator body and marked as a second magnet, the two magnets are opposite in position, and at least one of the two magnets is an electromagnet. When the magnetic ejection mechanism is opened, ejecting force is provided by using the principle that like magnetic poles repel each other, when the door is closed, attraction is provided by using the principle that opposite magnetic poles attract each other, and the direction of magnetic force can be changed by changing the current direction of an electromagnet.

An upper magnetic suspension mechanism is arranged at the hinged position of the upper part of the refrigerator door body and the upper part of the refrigerator box body; a lower magnetic suspension mechanism is arranged at the hinged position of the lower part of the refrigerator door body and the lower part of the refrigerator box body; the upper magnetic suspension mechanism and the lower magnetic suspension mechanism provide upward magnetic force for the refrigerator door body together, and the magnetic force overcomes all or part of gravity of the refrigerator door body, so that mechanical friction resistance is reduced, and the burden of a rotary actuating mechanism is reduced.

The rotary actuating mechanism drives the refrigerator door body to rotate relative to the refrigerator body, and the opening and closing of the refrigerator door body are completed.

Preferably, the first magnet is a permanent magnet and the second magnet is an electromagnet. When the electromagnet is powered off, the permanent magnet continues to work and is attracted with the iron core of the electromagnet, and the refrigerator door body is ensured to be locked continuously.

Preferably, magnetic ejection mechanisms are arranged on the upper portion and the lower portion of the refrigerator door body, so that stress is uniform; the first magnet is fixed on one side far away from the hinge joint of the door body, so that a larger moment is obtained.

Further, the upper magnetic suspension mechanism comprises a protective sleeve, an electromagnet ring and a permanent magnet ring; the protective sleeve is cylindrical, the electromagnet ring is fixed in the protective sleeve, and the permanent magnet ring is connected in the protective sleeve through a needle bearing; the permanent magnet ring is positioned below the electromagnet ring, a gap is reserved between the permanent magnet ring and the electromagnet ring, and the permanent magnet ring can slightly float up and down relative to the electromagnet ring; the permanent magnet ring is internally fixed with a rotating shaft of the refrigerator door body, and the output shaft of the rotary actuating mechanism penetrates through the permanent magnet ring downwards to be matched and connected with the rotating shaft of the refrigerator door body. The electromagnet ring and the permanent magnet ring are mutually attracted through magnetic force to overcome partial gravity of the refrigerator door body, so that the friction resistance of the rotation of the door body is reduced, the burden of a rotary actuating mechanism is reduced, and meanwhile, the noise is also reduced.

Further, the lower magnetic suspension mechanism comprises a dustproof sleeve, a permanent magnet support ring, a butterfly spring piece, an electromagnet support seat and an iron core; an iron core is fixed in the center of the electromagnet supporting seat, a dustproof sleeve is fixed on the electromagnet supporting seat, a permanent magnet supporting ring is rotatably arranged in the dustproof sleeve, a needle roller bearing is connected between the permanent magnet supporting ring and the inner wall of the dustproof sleeve, and a needle roller bearing is connected between the permanent magnet supporting ring and the iron core; the permanent magnet support ring can float up and down for a small distance relative to the electromagnet support seat; a butterfly spring piece is padded between the permanent magnet support ring and the electromagnet support seat and used for reducing vibration and providing support; and a refrigerator door rotating shaft is fixed in the permanent magnet supporting ring. The permanent magnet support ring and the electromagnet support seat repel each other through magnetic force to overcome partial gravity of the refrigerator door body, so that the rotating friction resistance of the door body is reduced, the burden of the rotary actuating mechanism is reduced, and meanwhile, the noise is also reduced.

Further, the rotary actuating mechanism comprises a shell, a speed reducing motor, a worm wheel and an output shaft; the shell is fixed on the refrigerator body, the speed reducing motor is fixed in the shell, and the worm is in power connection with the speed reducing motor; the output shaft is rotatably arranged in the shell and is fixedly provided with a worm wheel; the worm wheel is meshed with the worm; the output shaft drives the rotating shaft of the refrigerator door body to rotate.

Furthermore, an electromagnetic clutch is also connected in series between the worm and the speed reducing motor, so that the disconnection and connection of the power of the speed reducing motor are convenient to control, and the disconnection and connection of the resistance of the speed reducing motor are also convenient to control.

Furthermore, 3 through holes which are uniformly distributed within 120 degrees are arranged on the worm wheel; 5 light-emitting diodes which are uniformly distributed within 240 degrees and 5 photosensitive diodes which are uniformly distributed within 240 degrees are also fixed in the shell; the positions of the light emitting diodes and the positions of the photosensitive diodes are in one-to-one correspondence; the light emitted from the light emitting diode can be irradiated to the corresponding photodiode through the through hole. If light rays irradiate on the photosensitive diodes, voltage signals can be generated on the corresponding photosensitive diodes, the voltage signals are amplified by the amplifier and then transmitted to the control panel, and the control panel can judge the angle of the worm wheel (the angle corresponding to the refrigerator door body) and control the rotary actuating mechanism according to the combination of the signal states of the 5 photosensitive diodes.

Has the advantages that: compared with the prior art, the automatic opening and closing device for the refrigerator door simplifies the overall design of the existing mechanical ejector rod mechanism and the existing rotating mechanism in the opening and closing design of the refrigerator door body, reduces the manufacturing cost, and improves the production efficiency and the overall reliability of the actuating mechanism; in addition, due to the adoption of the electromagnetic ejection structural design and the magnetic suspension mechanism of the refrigerator door body, the friction force between the hinge pair of the refrigerator door body is greatly reduced, the working noise of the actuating mechanism is reduced, the mute design is realized, the harsh noise requirements of household appliances such as refrigerators are met, and the electromagnetic ejection mechanism is easy to popularize and use on a large scale.

Drawings

Fig. 1 is a schematic view illustrating the installation of the present invention in a refrigerator.

Fig. 2 is a partial schematic view of the upper magnetic levitation mechanism.

Fig. 3 is a partial schematic view of the lower magnetic levitation mechanism.

Fig. 4 and 5 are schematic structural views of the upper magnetic levitation mechanism in embodiment 2.

Fig. 6 and 7 are schematic structural views of the lower magnetic levitation mechanism in embodiment 2.

Fig. 8 and 9 are schematic views of the internal structure of the rotary actuator in embodiment 2.

In the figure, the magnetic ejection mechanism 1, the upper magnetic suspension mechanism 2, the lower magnetic suspension mechanism 3, the rotary actuator 4, the first magnet 11, the second magnet 12, the protective sleeve 21, the electromagnet ring 22, the permanent magnet ring 23, the dust-proof sleeve 31, the permanent magnet support ring 33, the butterfly spring piece 35, the electromagnet support base 36, the iron core 37, the housing 41, the reduction motor 42, the worm 43, the worm wheel 44, the output shaft 45, the electromagnetic clutch 46, and the through hole 441.

Detailed Description

The invention is further illustrated by the following specific examples, which are illustrative and intended to illustrate the problem and explain the invention, but not limiting.

Example 1

An automatic opening and closing device for a refrigerator door is shown in figures 1 to 3 and comprises a magnetic ejection mechanism 1, an upper magnetic suspension mechanism 2, a lower magnetic suspension mechanism 3 and a rotary actuating mechanism 4.

The magnetic ejection mechanism 1 is composed of a pair of magnets, wherein one magnet is fixed on the refrigerator door body and is marked as a first magnet 11, the other magnet is fixed on the refrigerator body and is marked as a second magnet 12, the two magnets are opposite in position, and at least one of the two magnets is an electromagnet.

An upper magnetic suspension mechanism 2 is arranged at the hinged position of the upper part of the refrigerator door body and the upper part of the refrigerator box body; a lower magnetic suspension mechanism 3 is arranged at the hinged part of the lower part of the refrigerator door body and the lower part of the refrigerator box body; the upper magnetic suspension mechanism 2 and the lower magnetic suspension mechanism 3 jointly provide upward magnetic force action for the refrigerator door body, and the magnetic force action overcomes all or part of gravity of the refrigerator door body; the rotary actuator 4 drives the refrigerator door body to rotate relative to the refrigerator body.

In the present embodiment, the first magnet 11 is a permanent magnet, and the second magnet 12 is an electromagnet.

In this embodiment, the magnetic ejection mechanisms 1 are disposed on both the upper portion and the lower portion of the refrigerator door, and the first magnet 11 is fixed on the side away from the hinge of the door.

Example 2

An automatic opening and closing device for a refrigerator door is shown in figures 1 to 9 and comprises a magnetic ejection mechanism 1, an upper magnetic suspension mechanism 2, a lower magnetic suspension mechanism 3 and a rotary actuating mechanism 4.

The magnetic ejection mechanism 1 is composed of a pair of magnets, wherein one magnet is fixed on the refrigerator door body and is marked as a first magnet 11, the other magnet is fixed on the refrigerator body and is marked as a second magnet 12, the two magnets are opposite in position, and at least one of the two magnets is an electromagnet.

An upper magnetic suspension mechanism 2 is arranged at the hinged position of the upper part of the refrigerator door body and the upper part of the refrigerator box body; a lower magnetic suspension mechanism 3 is arranged at the hinged part of the lower part of the refrigerator door body and the lower part of the refrigerator box body; the upper magnetic suspension mechanism 2 and the lower magnetic suspension mechanism 3 jointly provide upward magnetic force action for the refrigerator door body, and the magnetic force action overcomes all or part of gravity of the refrigerator door body; the rotary actuator 4 drives the refrigerator door body to rotate relative to the refrigerator body.

In the present embodiment, the first magnet 11 is a permanent magnet, and the second magnet 12 is an electromagnet.

In this embodiment, the magnetic ejection mechanisms 1 are disposed on both the upper portion and the lower portion of the refrigerator door, and the first magnet 11 is fixed on the side away from the hinge of the door.

In this embodiment, the upper magnetic suspension mechanism 2 includes a protective sleeve 21, an electromagnet ring 22, and a permanent magnet ring 23; the protecting sleeve 21 is cylindrical, the electromagnet ring 22 is fixed in the protecting sleeve 21, and the permanent magnet ring 23 is connected in the protecting sleeve 21 through a needle bearing; the permanent magnet ring 23 is positioned below the electromagnet ring 22, a gap is reserved between the permanent magnet ring 23 and the electromagnet ring 22, and the permanent magnet ring 23 can float up and down relative to the electromagnet ring 22; the permanent magnet ring 23 is internally fixed with a refrigerator door rotating shaft, and the output shaft of the rotary actuating mechanism 4 penetrates through the electromagnet ring 22 downwards to be connected with the refrigerator door rotating shaft in a matching way.

In this embodiment, the lower magnetic suspension mechanism 3 includes a dust-proof sleeve 31, a permanent magnet support ring 33, a butterfly spring piece 35, an electromagnet support seat 36, and an iron core 37; an iron core 37 is fixed in the center of the electromagnet support seat 36, the dustproof sleeve 31 is fixed on the electromagnet support seat 36, the permanent magnet support ring 33 is rotatably arranged in the dustproof sleeve 31, a needle bearing is connected between the permanent magnet support ring 33 and the inner wall of the dustproof sleeve 31, and a needle bearing is connected between the permanent magnet support ring 33 and the iron core 37; the permanent magnet support ring 33 can float a certain distance up and down relative to the electromagnet support base 36; a butterfly spring piece 35 is also padded between the permanent magnet support ring 33 and the electromagnet support seat 36; a rotating shaft of the refrigerator door body is fixed in the permanent magnet support ring 33.

In the present embodiment, the rotary actuator 4 includes a housing 41, a reduction motor 42, a worm 43, a worm wheel 44, and an output shaft 45; the shell 41 is fixed on the refrigerator body, the speed reducing motor 42 is fixed in the shell 41, and the worm 43 is sleeved on the output shaft of the speed reducing motor 42; the output shaft 45 is rotatably arranged in the shell 41, and a worm wheel 44 is fixed on the output shaft 45; the worm wheel 44 meshes with the worm 43; the output shaft 45 drives the rotating shaft of the refrigerator door body to rotate. An electromagnetic clutch 46 is also connected in series between the worm 43 and the reduction motor 42.

In this embodiment, the worm wheel 44 is provided with 3 through holes 441 uniformly distributed within 120 °; 5 light emitting diodes which are uniformly distributed within 240 degrees and 5 photosensitive diodes which are uniformly distributed within 240 degrees are fixed in the shell 41; the positions of the light emitting diodes and the positions of the photosensitive diodes are in one-to-one correspondence; light emitted from the light emitting diode may be irradiated to the corresponding photodiode through the through hole 441.

The present embodiment includes the following various operation processes.

The refrigerator door opening process: the second magnet 12 is electrified and mutually repulsed with the first magnet 11, and the refrigerator door body is opened for about 10-15 degrees in less than 0.5S; at the moment, the electromagnetic clutch 46 is electrified, two ends of the electromagnetic clutch 12 are meshed together, the speed reduction motor 42 is electrified and rotates to drive the refrigerator door body to be opened, the refrigerator door body rotates along with the rotation of the worm gear 44, the signal state of the photosensitive diode changes along with the rotation of the refrigerator door body, after the signal state changes to be close to the state that the refrigerator door body is completely opened, the power supply of the speed reduction motor 42 is cut off, and the refrigerator door body moves to the maximum opening position under the action of inertia. In the process of opening the refrigerator door body, the electromagnet ring 22 and the electromagnet supporting seat 36 are electrified, and the upper magnetic suspension mechanism 2 and the lower magnetic suspension mechanism 3 provide upward magnetic force for the refrigerator door body together through the magnetic force action, so that the friction force of the refrigerator door body during rotation is greatly reduced.

The closing process of the refrigerator door body is as follows: the electromagnetic clutch 46 is electrified, two ends of the electromagnetic clutch 12 are meshed together, the speed reduction motor 42 is electrified and rotates to drive the refrigerator door body to rotate, the refrigerator door body rotates along with the rotation of the worm gear 44, the signal state of the photosensitive diode changes along with the rotation of the electromagnetic clutch, after the signal state changes to a state close to the complete closing state of the refrigerator door body, the power supply of the speed reduction motor 42 and the electromagnetic clutch 46 is cut off after 0.5S is set, meanwhile, the magnetic ejection mechanism 1 is powered, the second magnet 12 and the first magnet 11 attract each other, the resistance of closing of the refrigerator door body is overcome, and the door closing action is completed. In the process of closing the refrigerator door body, the electromagnet ring 22 and the electromagnet supporting seat 36 are electrified, and the upper magnetic suspension mechanism 2 and the lower magnetic suspension mechanism 3 provide upward magnetic force for the refrigerator door body together through the magnetic force action, so that the friction force of the refrigerator door body during rotation is greatly reduced.

When the refrigerator door body is blocked in the opening and closing process: when the output torque of the reduction motor 42 in the rotary actuator 4 is overloaded and exceeds the set load value of the electromagnetic clutch 46, the electromagnetic clutch 46 slips and the current value of the electromagnetic clutch 46 is abnormal, and if the time when the current value exceeds the normal value exceeds 2S, the power supply of the reduction motor 42 and the electromagnetic clutch 46 is cut off, and the rotary actuator 4 stops working.

Automatic reset mode: and judging whether the signal state of the photosensitive diode is the state that the refrigerator door body is completely opened or completely closed, if not, executing a reset action, and judging and controlling the position of the door body after the reset is started to be consistent with the position of the refrigerator door body in the closing process.

Manual door opening and closing mode: when the power is off, the electromagnetic clutch 46 is in the off state, and the damping action of the speed reducing motor 42 does not need to be overcome when the door is opened and closed manually.

In the above processes, the working modes of the upper magnetic suspension mechanism 2 and the lower magnetic suspension mechanism 3 are as follows: when the refrigerator door body is opened, the upper magnetic suspension mechanism 2 and the lower magnetic suspension mechanism 3 are not powered off; when the door body of the refrigerator is closed and the rotary actuating mechanism 4 is powered off, the upper magnetic suspension mechanism 2 and the lower magnetic suspension mechanism 3 are powered off.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.