An anti-hand-pinch automatic door lock structure with clutch

Abstract

A clutch-type anti-pinch automatic door lock structure comprises a door lock housing, a lock catch is installed in the housing, a rack is installed at the rear side of the lock catch, a motor is also installed in the housing, a multi-stage transmission wheel is installed between the output shaft of the motor and the rack, one of the transmission wheels in the multi-stage transmission wheel is a clutch wheel, the clutch wheel comprises an upper clutch wheel and a lower clutch wheel, a bottom surface tooth is arranged on the lower surface of the upper clutch wheel, a top surface tooth is arranged on the lower clutch wheel, after the bottom surface tooth and the top surface tooth are meshed, the upper clutch wheel and the lower clutch wheel are linked, the relative torque between the upper clutch wheel and the lower clutch wheel will generate an upward component force on the upper clutch wheel, so that the bottom surface tooth and the top surface tooth are disengaged. The utility model is mainly used for dishwashers. When closing the door, if there is a foreign object blocking, the bottom surface tooth of the upper clutch wheel and the top surface tooth of the lower clutch wheel are disengaged, the door panel will not continue to press the obstacle, and the mechanical anti-pinch function is achieved. It also has an anti-collision function. When the door is opened and hits an obstacle, the door panel can stop moving after the clutch wheel works. It has the advantages of simple structure, convenient operation, safety and reliability.

Description

Technical Field

[0001] The utility model relates to an automatic door lock structure, in particular to an automatic door lock structure for a dishwasher which is used for preventing fingers from being pinched by a mechanical structure. Background Art

[0002] The automatic door lock structure of the dishwasher often encounters the situation of accidental finger pinching when closing the door automatically. Therefore, it is necessary to design an automatic door lock structure that can prevent finger pinching. Currently, the anti-finger pinching structures on the market are basically realized through sensors and circuits. Once a circuit fault or malfunction occurs, the problem of finger pinching is still prone to occur.

[0003] Patent No. 201910194892.6 is a hand-pinch prevention dishwasher and its control method, the control method includes: S1: monitoring whether the door drive unit of the dishwasher drives the door of the dishwasher to close or open the door, if yes, executing step S2; S2: responding to the door drive unit closing the door of the dishwasher, executing step S3; responding to the door drive unit opening the door of the dishwasher, executing step S6; S3: immediately or after a first preset time threshold, detecting whether the conductive material at the first preset position of the door of the dishwasher is touched, if yes, executing step S4; S4: stopping the door drive unit from closing the door of the dishwasher; S6: immediately or after a second preset time threshold, detecting whether the conductive material at the second preset position of the door of the dishwasher is touched, if yes, executing step S7; S7: stopping the door drive unit from opening the door of the dishwasher. This control method relies on pure circuits to complete, once a circuit failure occurs, it is difficult to disengage after being pinched. Summary of the invention

[0004] The utility model aims to solve the defects and shortcomings of the prior art and to provide an automatic door lock structure with clutch for dishwashers which can prevent fingers from being caught by mechanical structure.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: the anti-pinch automatic door lock structure with clutch comprises a door lock housing, a lock catch is installed in the housing, a rack is installed on the rear side of the lock catch, a motor is also installed in the housing, a multi-stage transmission wheel is installed between the output shaft of the motor and the rack, one of the transmission wheels in the multi-stage transmission wheel is a clutch wheel, the clutch wheel comprises an upper clutch wheel and a lower clutch wheel, the lower clutch wheel is directly or indirectly linked to the output shaft of the motor, and the upper clutch wheel is directly or indirectly linked to the rack The upper clutch wheel is movable, a bottom surface tooth is arranged on the lower surface of the upper clutch wheel, and a top surface tooth is arranged on the lower clutch wheel. After the bottom surface tooth and the top surface tooth are meshed, the upper clutch wheel and the lower clutch wheel are linked, and a compression spring is arranged above the upper clutch wheel, and the compression spring gives the upper clutch wheel a downward thrust; both sides of the top surface tooth and the bottom surface tooth are inclined surfaces, and the relative torque between the upper clutch wheel and the lower clutch wheel will generate an upward component force on the upper clutch wheel. After the upward component force is greater than the thrust of the compression spring and the gravity of the upper clutch wheel, the upper clutch wheel moves up, and the bottom surface tooth and the top surface tooth are disengaged.

[0006] The shell body is provided with a wheel axle, and the upper clutch wheel and the lower clutch wheel are movably sleeved on the wheel axle.

[0007] The compression spring is sleeved on the wheel axle and supported between the inner wall of the shell and the top surface of the upper clutch wheel.

[0008] The upper surface of the lower clutch wheel is provided with a concave cavity, the top surface teeth are arranged on the bottom surface of the concave cavity, and the bottom of the upper clutch wheel can be embedded in the concave cavity.

[0009] A circuit board is arranged in the shell, a grating sensor is installed on the door frame, and a grating signal sampling circuit is arranged on the circuit board. When the door is closed, the grating sensor detects an obstacle at the door frame, and the grating signal sampling circuit transmits an abnormal grating signal to the circuit board, and the circuit board controls the motor to stop working or rotate in the reverse direction.

[0010] A circuit board is arranged in the shell, and a current signal sampling circuit is arranged on the circuit board. When the door closing is obstructed, the current signal sampling circuit will detect an abnormal current signal and transmit the abnormal current signal to the circuit board, and the circuit board controls the motor to stop working or rotate in the reverse direction.

[0011] A circuit board is arranged in the shell, and a voltage ripple sampling circuit is arranged on the circuit board. When the door closing is obstructed, the voltage ripple sampling circuit will detect abnormal voltage ripple and transmit the abnormal voltage ripple signal to the circuit board, and the circuit board controls the motor to stop working or rotate in the reverse direction.

[0012] The utility model is mainly used for dishwashers. The motor can realize automatic door opening and closing through multi-stage transmission wheels, racks and locks. When closing the door, if there is a foreign object blocking it, the rack and the upper clutch wheel will no longer move due to the obstruction, and the lower clutch wheel will continue to rotate, so that the relative torque between the upper clutch wheel and the lower clutch wheel increases, and the upward component force of the upper clutch wheel also increases until the bottom teeth and the top teeth are disengaged, and the door panel will not continue to press the obstacle, thus playing a role in preventing the hand from being pinched. The utility model also has an anti-collision function. When the door is opened and encounters an obstacle, the door panel can stop moving after the clutch wheel works. In addition, by setting a grating signal sampling circuit, a current signal sampling circuit or a voltage ripple sampling circuit, when an abnormal signal is received, the motor can be controlled to stop working or rotate in the opposite direction, making the hand-pinch prevention more sensitive, and having the advantages of simple structure, convenient operation, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structural decomposition of the utility model.

[0014] Figure 2 It is a schematic diagram of the structure of the utility model after removing the shell.

[0015] Figure 3 This is a structural sectional view of the clutch wheel position of the utility model.

[0016] Figure 4 This is a schematic diagram of the structure of the upper clutch wheel of the utility model.

[0017] Figure 5 This is a schematic diagram of the structure of the lower clutch wheel of the utility model. DETAILED DESCRIPTION

[0018] like Figure 1 , Figure 2 As shown, the utility model is an anti-pinch automatic door lock structure with clutch, which is mainly used for dishwashers or other electrical appliances. It includes a door lock housing 10, a lock catch 30 is installed in the housing 10, and a rack 20 is installed on the rear side of the lock catch 30. After the lock catch 30 is inserted into the lock slot on the door panel, the rack 20 moves to drive the door panel to move. A motor 50 is also installed in the housing 10, and a multi-stage transmission wheel 40 is installed between the output shaft of the motor 50 and the rack 20, so that the door can be opened and closed automatically when the motor 50 rotates.

[0019] like Figure 3 , Figure 4 , Figure 5 As shown, one of the transmission wheels in the multi-stage transmission wheel 40 is a clutch wheel 60, and the clutch wheel 60 includes an upper clutch wheel 61 and a lower clutch wheel 62. The lower clutch wheel 62 is directly or indirectly linked to the output of the motor 50, and the upper clutch wheel 61 is directly or indirectly linked to the rack 20.

[0020] The housing 10 is provided with a wheel shaft 11, and the upper clutch wheel 61 and the lower clutch wheel 62 are movably mounted on the wheel shaft 11, and the upper clutch wheel 61 can slide up and down along the wheel shaft 11. The lower surface of the upper clutch wheel 61 is provided with a bottom surface tooth 611, and the lower clutch wheel 62 is provided with a top surface tooth 621. After the bottom surface tooth 611 and the top surface tooth 621 are engaged, the upper clutch wheel 61 and the lower clutch wheel 62 are linked. A compression spring 70 is provided above the upper clutch wheel 61. The compression spring 70 is mounted on the wheel shaft 11 and supported between the inner wall of the housing 10 and the top surface of the upper clutch wheel 61. The compression spring 70 gives the upper clutch wheel 61 a downward thrust to ensure that the bottom surface tooth 611 and the top surface tooth 621 are engaged. The upper surface of the lower clutch wheel 62 is provided with a cavity 622 , and the top surface teeth 621 are provided on the bottom surface of the cavity 622 . The bottom of the upper clutch wheel 61 can be embedded in the cavity 622 , so that the overall height of the clutch wheel 60 can be reduced.

[0021] The top teeth 621 and the bottom teeth 611 are both inclined surfaces. The relative torque between the upper clutch wheel 61 and the lower clutch wheel 62 will generate an upward force component on the upper clutch wheel 61. When the upward force component is greater than the thrust of the compression spring 70 and the gravity of the upper clutch wheel 61, the upper clutch wheel 61 moves upward, and the bottom teeth 611 and the top teeth 621 are disengaged. Therefore, when closing the door, if there is a foreign object blocking, the rack 20 and the upper clutch wheel 61 will no longer move due to the obstruction, and the lower clutch wheel 62 will continue to rotate, so that the relative torque between the upper clutch wheel 61 and the lower clutch wheel 62 increases, and the upward force component on the upper clutch wheel 61 also increases, until the bottom teeth 611 and the top teeth 621 are disengaged, the lower clutch wheel 62 is idle, and the upper clutch wheel 61 is not subjected to force, so the door panel will not continue to press the obstacle, which plays a role in preventing the hand from being pinched. After the obstacle is removed, under the action of the restoring force of the compression spring 70 , the upper clutch wheel 61 returns to its original position, and the bottom surface teeth 611 of the upper clutch wheel 61 re-engage with the top surface teeth 621 of the lower clutch wheel 62 .

[0022] The housing 10 is provided with a circuit board, a grating sensor is installed on the door frame, and a grating signal sampling circuit is provided on the circuit board. When the door is closed, the grating sensor detects an obstacle at the door frame, and the grating signal sampling circuit transmits an abnormal grating signal to the circuit board, and the circuit board controls the motor 50 to stop working or rotate in the reverse direction. The grating signal sampling circuit is more sensitive to the mechanical structure of the clutch wheel 60, and the anti-pinch finger protection is achieved painlessly.

[0023] Alternatively, a current signal sampling circuit may be provided on the circuit board. When the door closing is obstructed, the current signal sampling circuit will detect an abnormal current signal and transmit the abnormal current signal to the circuit board, and the circuit board controls the motor 50 to stop working or rotate in the reverse direction. The current signal sampling circuit is more sensitive to the mechanical structure of the clutch wheel 60, and the hand pinching prevention is achieved painlessly.

[0024] Alternatively, a voltage ripple sampling circuit may be provided on the circuit board. When the door closing is obstructed, the voltage ripple sampling circuit detects abnormal voltage ripple and transmits the abnormal voltage ripple signal to the circuit board, and the circuit board controls the motor 50 to stop working or rotate in the reverse direction. The voltage ripple sampling circuit is more sensitive to the mechanical structure of the clutch wheel 60, and the hand pinching prevention is achieved painlessly.

[0025] The utility model is mainly used for dishwashers. The motor 50 can realize automatic door opening and closing through the multi-stage transmission wheel 40, the rack 20 and the lock 30. When closing the door, if there is a foreign object blocking, the rack 20 and the upper clutch wheel 61 will no longer move due to the obstruction, and the lower clutch wheel 62 will continue to rotate, so that the relative torque between the upper clutch wheel 61 and the lower clutch wheel 62 increases, and the upward component force of the upper clutch wheel 61 also increases until the bottom surface teeth 611 and the top surface teeth 621 are disengaged, and the door panel will not continue to press the obstacle, thus playing the role of preventing the hand from being pinched. The utility model also has an anti-collision function. When the door is opened and encounters an obstacle, the door panel can stop moving after the clutch wheel takes effect. In addition, by installing a grating sensor, setting a current signal sampling circuit or a voltage ripple sampling circuit, the circuit can make the anti-pinching more sensitive, and has the advantages of simple structure, convenient operation, safety and reliability.

Claims

1. An anti-pinch automatic door lock structure with clutch, which includes a door lock housing, a lock catch installed in the housing, a rack installed on the rear side of the lock catch, a motor installed in the housing, and a multi-stage transmission wheel installed between the output shaft of the motor and the rack, characterized in that One of the multi-stage transmission wheels is a clutch wheel, which includes an upper clutch wheel and a lower clutch wheel. The lower clutch wheel is directly or indirectly linked to the output of the motor, and the upper clutch wheel is directly or indirectly linked to the rack. Bottom teeth are arranged on the lower surface of the upper clutch wheel, and top teeth are arranged on the lower clutch wheel. After the bottom teeth and the top teeth are meshed, the upper clutch wheel and the lower clutch wheel are linked. A compression spring is arranged above the upper clutch wheel, and the compression spring gives the upper clutch wheel a downward thrust. Both sides of the top teeth and the bottom teeth are inclined surfaces. The relative torque between the upper clutch wheel and the lower clutch wheel will generate an upward component force on the upper clutch wheel. After the upward component force is greater than the thrust of the compression spring and the gravity of the upper clutch wheel, the upper clutch wheel moves up, and the bottom teeth and the top teeth are disengaged.

2. The anti-pinch automatic door lock structure with clutch according to claim 1 is characterized in that The shell body is provided with a wheel axle, and the upper clutch wheel and the lower clutch wheel are movably sleeved on the wheel axle.

3. The anti-pinch automatic door lock structure with clutch according to claim 2 is characterized in that The compression spring is sleeved on the wheel axle and supported between the inner wall of the shell and the top surface of the upper clutch wheel.

4. The anti-pinch automatic door lock structure with clutch according to claim 1 is characterized in that The upper surface of the lower clutch wheel is provided with a concave cavity, the top surface teeth are arranged on the bottom surface of the concave cavity, and the bottom of the upper clutch wheel can be embedded in the concave cavity.

5. An anti-pinch automatic door lock structure with clutch according to any one of claims 1 to 4, characterized in that A circuit board is arranged in the shell, a grating sensor is installed on the door frame, and a grating signal sampling circuit is arranged on the circuit board. When the door is closed, when the grating sensor detects an obstacle at the door frame, the grating signal sampling circuit will transmit an abnormal grating signal to the circuit board, and the circuit board controls the motor to stop working or rotate in the opposite direction.

6. An anti-pinch automatic door lock structure with clutch according to any one of claims 1 to 4, characterized in that A circuit board is arranged in the shell, and a current signal sampling circuit is arranged on the circuit board. When the door closing is obstructed, the current signal sampling circuit will detect an abnormal current signal and transmit the abnormal current signal to the circuit board, and the circuit board controls the motor to stop working or rotate in the reverse direction.

7. An anti-pinch automatic door lock structure with clutch according to any one of claims 1 to 4, characterized in that A circuit board is arranged in the shell, and a voltage ripple sampling circuit is arranged on the circuit board. When the door closing is obstructed, the voltage ripple sampling circuit will detect abnormal voltage ripple and transmit the abnormal voltage ripple signal to the circuit board, and the circuit board controls the motor to stop working or rotate in the reverse direction.

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