Automatic door opening and closing device of dish washing machine and dish washing machine

Abstract

The utility model discloses a dish-washing machine automatic door opening and closing device and a dish-washing machine, the dish-washing machine automatic door opening and closing device comprises a spring, a roller, a pull rope, a driving mechanism and a motor positive and negative rotation limit detection and current detection circuit, the driving mechanism comprises a motor and an electromagnetic clutch connected to a motor output shaft, and one end of the spring is fixedly connected to a host; the other end of the spring is connected to one end of the pull rope, the other end of the pull rope bypasses the roller and the electromagnetic clutch and then is connected to a hinge on the door body, and the door body is rotationally connected to the main machine through the hinge. According to the utility model, the electromagnetic clutch is arranged, so that manual and automatic opening and closing switching of the door body can be realized; by arranging the motor positive and negative rotation limiting detection and current detection circuit, positive and negative rotation of the motor can be controlled on one hand, and on the other hand, door opening and closing position detection and overcurrent protection can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, and more specifically to an automatic door opening and closing device for a dishwasher and a dishwasher. Background Art

[0002] During the dishwashing process, dishwashers generally use water heating to wash dishes, and the heating temperature can reach 80-90℃. The drying method generally uses water residual temperature + hot air (PTC + fan) to dry the dishes. This drying method will cause condensed water to form in the dishwasher tank and adhere to the surface of the dishes, causing secondary pollution and poor drying effect. At the same time, when the door is opened after washing, there will be high-temperature steam, which may cause burns. Therefore, existing dishwashers are generally equipped with automatic door opening and closing modules, which enable the dishwasher to automatically open the door to release hot air during the drying stage, and automatically close the door for hot air drying, reducing the generation of secondary condensed water and improving the drying effect.

[0003] Although dishwashers with automatic door opening and closing modules can achieve the effect of automatic door opening and closing, there are the following problems during use: 1. During the door closing stage, if the user puts his hand in the gap between the door body and the inner tank, his hand will be pinched, causing serious injury; 2. During the automatic door opening process, if the restriction and door fixing mechanism fails, the door body will fall freely. If there is a user standing in the door falling area at this time, whether it is an adult or a child, especially a child under 60 cm in height, it will cause serious personal injury.

[0004] Therefore, it is necessary to propose a new solution to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and to provide an automatic door opening and closing device for a dishwasher and a dishwasher.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A dishwasher automatic door opening and closing device comprises a spring, a roller, a pull rope and a driving mechanism, wherein the driving mechanism comprises a motor and an electromagnetic clutch connected to the output shaft of the motor, one end of the spring is fixedly connected to the main machine, the other end of the spring is connected to one end of the pull rope, the other end of the pull rope is connected to a hinge on a door body after passing through the roller and the electromagnetic clutch, and the door body is rotatably connected to the main machine through the hinge;

[0008] The motor forward and reverse limit detection and current detection circuit is also included. The motor forward and reverse limit detection and current detection circuit includes a transistor Q1, a transistor Q2, a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor R3, and a relay K1. One end of the motor is connected to the first contact of the relay K1, the second contact of the relay K1 is connected to one end of the coil of the relay K1, and the common connection end is connected to one end of the power supply. The third contact of the relay K1 is connected to one end of the resistor R2, and the other end of the motor is connected to the resistors R2 and R3. One end of R1 and one end of resistor R3, the other end of the resistor R1 is respectively connected to the other end of the resistor R2, the base of the transistor Q2 and the base of the transistor Q1, the other end of the resistor R3 is respectively connected to the emitter of the transistor Q2 and the emitter of the transistor Q1, and the common connection end is connected to the other end of the power supply, the collector of the transistor Q1 is connected to the anode of the diode D1, the collector of the transistor Q2 is connected to the cathode of the diode D2, and the anode of the diode D2 is respectively connected to the cathode of the diode D1 and the other end of the coil of the relay K1.

[0009] Furthermore, it also includes a tension detection circuit, which includes an operational amplifier U6, a resistor RH and a resistor RL, the same-direction input terminal of the operational amplifier U6 is respectively connected to one end of the resistor RH and one end of the resistor RL, the other end of the resistor RL is grounded, the other end of the resistor RH is connected to the dishwasher controller, the reverse input terminal of the operational amplifier U6 is connected to its output terminal, and its common connection terminal is connected to the motor, the positive power supply terminal of the operational amplifier U6 is connected to a +5V voltage, and the negative power supply terminal of the operational amplifier U6 is grounded.

[0010] Furthermore, it includes the above-mentioned automatic door opening and closing device of the dishwasher, a main unit, and a door body, the door body is rotatably connected to the main unit through a hinge, the hinge includes an articulation seat 1 and an articulation seat 2, the articulation seat 1 and the articulation seat 2 are hinged, the articulation seat 1 is installed on the main unit, and the articulation seat 2 is installed on the door body.

[0011] Furthermore, a distance measuring sensor is installed on the inner side of the door body.

[0012] Furthermore, a sensing device for sensing objects is installed on the door body.

[0013] The beneficial effects of the utility model are:

[0014] 1. In the utility model, by setting an electromagnetic clutch, the door can be switched between manual and automatic opening and closing, so that the door can be automatically opened to release hot air during the drying stage of the dishwasher, and the door can be automatically closed for hot air drying, thereby reducing the generation of secondary condensed water, improving the drying effect, and avoiding scalding of users.

[0015] 2. In the present invention, by setting the motor forward and reverse limit detection and current detection circuit, on the one hand, the motor forward and reverse rotation can be controlled, and on the other hand, the switch door position can be detected and overcurrent protection can be performed.

[0016] 3. In the present invention, by setting a tension detection circuit, corresponding actions are taken according to the collected motor voltage value to protect personnel.

[0017] 4. In the present invention, distance measuring sensors and sensing devices are provided to avoid harm to personnel caused by unsafe factors such as structural failure of the dishwasher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an automatic door opening and closing device for a dishwasher in this embodiment;

[0019] Figure 2 This is a schematic diagram of a connection structure between a pull rope and a hinge in this embodiment;

[0020] Figure 3 This is a schematic diagram of a connection structure between a pull rope and an electromagnetic clutch rotor in this embodiment;

[0021] Figure 4 Schematic diagram of another connection structure between the pull rope and the electromagnetic clutch rotor in this embodiment;

[0022] Figure 5 A circuit diagram of the motor forward and reverse rotation limit detection and current detection circuit in this embodiment;

[0023] Figure 6 4 is a circuit diagram of the tension detection circuit in this embodiment.

[0024] Figure numerals: spring 1, roller 2, pull rope 3, driving mechanism 4, electromagnetic clutch 401, rotor 4011, main unit 5, door body 6, hinge 7, hinge seat 1 701, hinge seat 2 702. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment: A dishwasher automatic door opening and closing device is installed in the dishwasher, such as Figure 1 , Figure 2As shown, the dishwasher includes a main unit 5 and a door body 6, and the door body 6 is rotatably connected to the main unit 5 through a hinge 7; the inner tank opening of the main unit 5 can be opened and closed by opening and closing the door body 6; the hinge 7 includes an articulated seat 1 701 and an articulated seat 2 702, and the articulated seat 1 701 and the articulated seat 2 702 are hinged to each other, the articulated seat 1 701 is installed on the main unit 5, and the articulated seat 2 702 is installed on the door body 6, so as to realize the installation of the door body 6.

[0027] Specifically, Figure 1 As shown, the automatic door opening and closing device includes a spring 1, a roller 2, a pull rope 3 and a driving mechanism 4. The driving mechanism 4 includes a motor (not shown) and an electromagnetic clutch 401 connected to the output shaft of the motor. One end of the spring 1 is fixedly connected to the main machine 5, and the other end of the spring 1 is connected to one end of the pull rope 3. The roller 2 is rotatably connected to the main machine 5, and the other end of the pull rope 3 is connected to the hinge 7 on the door body 6 after passing through the roller 2 and the electromagnetic clutch 401.

[0028] Among them, the roller 2 plays a role in guiding the pull rope 3; the electromagnetic clutch 401 is a mechanical device that transmits power through electromagnetic action. It is a prior art and the principle is: it includes a fixed stator and a rotating rotor 4011. When the electromagnetic clutch 401 is energized, the coil generates magnetic force. Under the action of the magnetic force, the stator drives the rotor 4011 to rotate through the clutch. When the electromagnetic clutch 401 is de-energized, the magnetic force disappears, the clutch is in a disengaged state, the stator does not rotate, and the rotor 4011 can rotate freely.

[0029] When in use, the stator of the electromagnetic clutch 401 is connected to the output shaft of the motor, and the other end of the pull rope 3 is wound around the rotor 4011 of the electronic clutch. When the electromagnetic clutch 401 is powered on, the motor drives the stator to rotate through its output shaft, and the stator drives the rotor 4011 to rotate through the clutch. Since the pull rope 3 is wound around the rotor 4011 of the electromagnetic clutch 401, when the rotor 4011 rotates, the pull rope 3 can be driven to move by friction, and the pull rope 3 acts on the door body 6 through the hinge 7. At this time, the pull rope 3 can be tightened and loosened by the forward and reverse rotation of the motor, so as to realize the automatic opening and closing of the door body 6; when the electromagnetic clutch 401 is powered off, the motor is turned off, the stator of the electromagnetic clutch 401 does not rotate, and its rotor 4011 is in a free rotation state. At this time, the opening and closing of the door body 6 can be realized manually. At the same time, the pull rope 3 and the spring 1 cooperate to enable it to bear the tension. In the process of closing the door body 6, the tension is used to resist the dead weight of the door body 6, so that the door body 6 can be automatically closed.

[0030] like Figure 3 As shown, the other end of the pull rope 3 can be connected to the hinge 7 after passing around the rotor 4011 of the electromagnetic clutch 401, or as shown in FIG. Figure 4As shown, the other end of the pull rope 3 is connected to the hinge 7 after being wound around the rotor 4011 of the electromagnetic clutch 401. In the above two connection methods, the rotor 4011 of the electromagnetic clutch 401 can drive the pull rope 3 to move through friction, so that the pull rope 3 tightens the hinge 7 and relaxes the hinge 7, that is, the pull rope 3 tightens the hinge 7 to gradually close the door body 6, and the pull rope 3 relaxes the hinge 7 to gradually open the door body 6.

[0031] By setting the electromagnetic clutch 401, the door body 6 can be switched between manual and automatic switching, so that the door can be automatically opened to release hot air and automatically closed for hot air drying during the drying stage of the dishwasher, thereby reducing the generation of secondary condensed water, improving the drying effect, and avoiding scalding of users.

[0032] Preferably, the automatic door opening and closing device can be installed on one side or both sides of the dishwasher main unit 5. If it is installed on both sides of the main unit 5, the door body 6 can be opened and closed more stably.

[0033] Furthermore, the automatic switch device also includes a motor forward and reverse limit detection and current detection circuit, such as Figure 5 As shown, the motor forward and reverse limit detection and current detection circuit includes a transistor Q1, a transistor Q2, a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor R3, and a relay K1. One end of the motor is connected to the first contact of the relay K1, the second contact of the relay K1 is connected to one end of the coil of the relay K1, and the common connection end (i.e., the +24V end) is connected to one end of the power supply. The third contact of the relay K1 is connected to one end of the resistor R2, and the other end of the motor is connected to one end of the resistor R1 and one end of the resistor R3 respectively. The other end of the resistor R1 is connected to one end of the resistor R3. The ends are respectively connected to the other end of the resistor R2, the base of the transistor Q2 and the base of the transistor Q1, the other end of the resistor R3 is respectively connected to the emitter of the transistor Q2 and the emitter of the transistor Q1, and their common connection end (i.e., the GND end) is connected to the other end of the power supply, the collector of the transistor Q1 is connected to the anode of the diode D1, the collector of the transistor Q2 is connected to the cathode of the diode D2, and the anode of the diode D2 is respectively connected to the cathode of the diode D1 and the other end of the coil of the relay K1; wherein, the transistor Q1 is a PNP transistor, and the transistor Q2 is an NPN transistor.

[0034] When the +24V terminal is connected to the positive pole of the power supply and the GND terminal is connected to the negative pole of the power supply, the motor rotates forward; at this time, since the motor is connected to the normally closed contact of the relay K1 (that is, the first contact and the second contact are turned on), the motor works directly. When the motor reaches the limit position or an error stall occurs, the working current of the motor increases, and the voltage across the sampling resistor R3 increases. The voltage is transmitted to the transistor Q2 through the resistor R1. When the voltage across the resistor R3 exceeds the conduction voltage of the transistor Q2, the relay K1 switches, that is, the first contact and the second contact of the relay K1 are disconnected, and the second contact and the third contact of the relay K1 are turned on, and the motor is powered off. At the same time, the base of the transistor Q2 is connected to the positive pole of the power supply via the resistor R2 and the relay K1, so it can always remain in the on state, so that the relay K1 also always remains in the working state. At this time, the transistor Q1 does not work.

[0035] When the +24V terminal is connected to the negative pole of the power supply and the GND terminal is connected to the positive pole of the power supply, the motor reverses; at this time, since the motor is connected to the normally closed contact of the relay K1 (that is, the first contact and the second contact are turned on), the motor works directly. When the motor reaches the limit position or misalignment and stall occurs, the voltage of the resistor R3 increases, the transistor Q1 is turned on, and the relay K1 switches, that is, the first contact and the second contact of the relay K1 are disconnected, and the second contact and the third contact of the relay K1 are turned on, and the motor is powered off. At the same time, the base of the transistor Q1 is connected to the negative pole of the power supply through the resistor R2 and the relay K1, so it can always remain in the on state, so that the relay K1 also always remains in the working state. At this time, the transistor Q2 does not work.

[0036] When encountering limit or stall, relay K1 switches, the motor is powered off and stops running. The protection can only be released by re-energizing the +24V / GND terminal or switching the motor running direction.

[0037] By setting the motor forward and reverse limit detection and current detection circuit, on the one hand, the motor forward and reverse rotation can be controlled, and on the other hand, the switch door position can be detected and over-current protection can be performed.

[0038] Furthermore, the automatic switch device further comprises a tension detection circuit, such as Figure 6 As shown, the tension detection circuit includes an operational amplifier U6, a resistor RH and a resistor RL. The same-direction input terminal of the operational amplifier U6 is respectively connected to one end of the resistor RH and one end of the resistor RL, the other end of the resistor RL is grounded, and the other end of the resistor RH is connected to the dishwasher controller. The reverse input terminal of the operational amplifier U6 is connected to its output terminal, and its common connection terminal is connected to the motor. The positive power supply terminal of the operational amplifier U6 is connected to a +5V voltage, and the negative power supply terminal of the operational amplifier U6 is grounded.

[0039] The tension detection circuit is a voltage follower, which collects voltage after being connected to the controller, and takes corresponding actions according to the voltage value; for example, during the process of closing the door, the size of the door closing force is always sensed. When the door closing force is sensed to be greater than the normal recovery force of the pull rope 3 (the normal recovery force is the force of the pull rope 3 overcoming the deadweight of the door body 6 and being able to pull the door body 6 to perform the door closing action), the door pulling action is stopped immediately, and the motor is reversed to perform the door opening action. Since the tension of the pull rope 3 is driven by the motor, the size of the door closing force can be sensed by the motor voltage. By sensing the size of the door closing force, it is possible to avoid the user's hand being pinched in the gap formed between the door body 6 and the inner liner during the door closing stage, causing serious injury.

[0040] This embodiment also provides a dishwasher, such as Figure 1 , Figure 2 As shown, it includes the above-mentioned automatic door opening and closing device of the dishwasher, a main unit 5, and a door body 6, the door body 6 is rotatably connected to the main unit 5 through a hinge 7; the inner tank opening of the main unit 5 can be opened and closed by opening and closing the door body 6; the hinge 7 includes an articulation seat 1 701 and an articulation seat 2 702, the articulation seat 1 701 and the articulation seat 2 702 are hinged to each other, the articulation seat 1 701 is installed on the main unit 5, and the articulation seat 2 702 is installed on the door body 6, so as to realize the installation of the door body 6.

[0041] Furthermore, a distance sensor (not shown) is installed on the inner side of the door body 6, that is, the distance sensor is installed on the side of the door body 6 facing the inner tank of the main unit 5, and the distance sensor is connected to the dishwasher control. During the door closing process, the distance sensor keeps measuring the door closing distance. When it is detected that the door closing distance has not changed, the door pulling action is immediately stopped, and the motor is reversed to perform the door opening action.

[0042] Furthermore, the door body 6 is equipped with a sensing device (not shown) for sensing objects, such as a camera, an infrared sensor, etc., which can sense whether there are objects in the area directly in front of the door body 6 and in the areas on the left and right sides during the door opening and closing process, and provide safety prompts through a voice module or other means. At the same time, the action to be performed can be broadcasted by voice before the door opening and closing action is about to be performed, so as to remind people not to put their hands or other objects into the gap between the door body 6 and the inner tank of the host 5.

[0043] By adopting the above design, personal injury caused by free fall of the door body 6 due to failure of the mechanism for restricting and fixing the door body 6 during the automatic door opening and closing process can be avoided.

[0044] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A dishwasher automatic door opening and closing device, characterized in that: The invention comprises a spring (1), a roller (2), a pull rope (3) and a driving mechanism (4), wherein the driving mechanism (4) comprises a motor and an electromagnetic clutch (401) connected to the output shaft of the motor, one end of the spring (1) is fixedly connected to a main machine (5), the other end of the spring (1) is connected to one end of the pull rope (3), the other end of the pull rope (3) is connected to a hinge (7) on a door body (6) after passing through the roller (2) and the electromagnetic clutch (401), and the door body (6) is rotatably connected to the main machine (5) via the hinge (7); The motor forward and reverse limit detection and current detection circuit is also included. The motor forward and reverse limit detection and current detection circuit includes a transistor Q1, a transistor Q2, a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor R3, and a relay K1. One end of the motor is connected to the first contact of the relay K1, the second contact of the relay K1 is connected to one end of the coil of the relay K1, and the common connection end is connected to one end of the power supply. The third contact of the relay K1 is connected to one end of the resistor R2, and the other end of the motor is connected to the resistors R2 and R3. One end of R1 and one end of resistor R3, the other end of the resistor R1 is respectively connected to the other end of the resistor R2, the base of the transistor Q2 and the base of the transistor Q1, the other end of the resistor R3 is respectively connected to the emitter of the transistor Q2 and the emitter of the transistor Q1, and the common connection end is connected to the other end of the power supply, the collector of the transistor Q1 is connected to the anode of the diode D1, the collector of the transistor Q2 is connected to the cathode of the diode D2, and the anode of the diode D2 is respectively connected to the cathode of the diode D1 and the other end of the coil of the relay K1.

2. The automatic door opening and closing device of a dishwasher according to claim 1, characterized in that: It also includes a tension detection circuit, which includes an operational amplifier U6, a resistor RH and a resistor RL. The same-direction input terminal of the operational amplifier U6 is respectively connected to one end of the resistor RH and one end of the resistor RL, the other end of the resistor RL is grounded, and the other end of the resistor RH is connected to the dishwasher controller. The reverse input terminal of the operational amplifier U6 is connected to its output terminal, and its common connection terminal is connected to the motor. The positive power supply terminal of the operational amplifier U6 is connected to a +5V voltage, and the negative power supply terminal of the operational amplifier U6 is grounded.

3. A dishwasher, characterized in that: The invention comprises an automatic door opening and closing device for a dishwasher as claimed in any one of claims 1 to 2, a main unit (5), and a door body (6), wherein the door body (6) is rotatably connected to the main unit (5) via a hinge (7), wherein the hinge (7) comprises an articulated seat 1 (701) and an articulated seat 2 (702), wherein the articulated seat 1 (701) and the articulated seat 2 (702) are hinged to each other, wherein the articulated seat 1 (701) is mounted on the main unit (5), and the articulated seat 2 (702) is mounted on the door body (6).

4. A dishwasher according to claim 3, characterized in that: A distance measuring sensor is installed on the inner side of the door body (6).

5. A dishwasher according to claim 3, characterized in that: The door body (6) is provided with a sensing device for sensing objects.

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