Front-loading washing machine

1. A front-loading washing machine, comprising:

a cabinet having a front panel, wherein the front panel is provided with an opening;

a tub having an access port for loading and unloading laundry, wherein the tub is disposed in the cabinet, and configured in such a manner that the access port is capable of being moved up and down in the opening, the tub having a rear edge opposite the access port, an upper side, and a lower side opposite the upper side;

a rotatable drum disposed in the tub;

a door unit mounted to the tub, and covering the access port;

a driving mechanism configured to drive the tub to rotate, wherein the driving mechanism is provided in the cabinet and coupled with the tub, and the driving mechanism comprises:

a longitudinal pushrod with a first end disposed at a front side of the tub;

a transverse shaft disposed proximate to the rear edge and the lower side of the tub and coupled with the tub; and

a support frame comprising two longitudinal brackets and a transverse bracket, wherein the two longitudinal brackets are spaced apart from each other, the transverse bracket has two ends connected with the two longitudinal brackets respectively, the support frame connected to the cabinet and having a hole, the transverse bracket receiving a second end of the drive mechanism;

wherein the transverse shaft is configured to rotate in the hole of the support frame; and

a controller communicating with the driving mechanism, wherein when the front-loading washing machine starts a washing cycle, the controller controls the driving mechanism to drive the access port to move downwards, and wherein when the front-loading washing machine stops the washing cycle, the controller controls the driving mechanism to drive the access port to move upwards;

wherein the controller controls the driving mechanism to drive the access port to move upwards or downwards by controlling polarity of a direct current input to the driving mechanism; and

wherein the controller comprises a first relay and a second relay, the first relay being configured to control an on-off state of the direct current input to the driving mechanism, and the second relay being configured to control the polarity of the direct current input to the driving mechanism;

wherein the support frame, the tub, and the driving mechanism are dampened relative to the cabinet by a damping vibration absorption mount comprised of a plurality of dampers that connect the support frame to the cabinet.

2. The front-loading washing machine according to claim 1 , wherein the driving mechanism is configured to drive the access port to move up and down between a non-washing-state position and a washing-state position in the opening.

3. The front-loading washing machine according to claim 2 , wherein when the access port is located at the non-washing-state position, the access port is driven to move close to an upper edge of the front panel; and when the access port is located at the washing-state position, the access port is driven to move close to a lower edge of the front panel.

4. The front-loading washing machine according to claim 2 , wherein when the access port is located at the non-washing-state position, an included angle between a central axis of the access port and a horizontal plane is 45 degrees to 90 degrees; and when the access port is located at the washing-state position, the included angle between the central axis of the access port and the horizontal plane is 0 degree to 15 degrees.

5. The front-loading washing machine according to claim 1 , wherein the driving mechanism is configured to drive the access port to move upwards to approach the upper edge of the front panel and move downwards to approach the lower edge of the front panel.

6. The front-loading washing machine according to claim 1 , wherein when the first relay is closed and the second relay is open, the driving mechanism drives the access port to move upwards; and when the first relay is closed and the second relay is closed, the driving mechanism drives the access port to move downwards.

7. The front-loading washing machine according to claim 6 , wherein a maximum one-way time for the driving mechanism to drive the access port to move upwards or downwards is a pre-determined adjustable time.

8. The front-loading washing machine according to claim 7 , wherein after the front-loading washing machine is powered and before the washing cycle starts, the first relay is closed for the pre-determined adjustable time and the second relay is open; when the front-loading washing machine starts the washing cycle, the second relay is closed before the first relay, and the first relay and the second relay are closed for the pre-determined adjustable time simultaneously once the first relay is closed; and when the washing cycle is finished, the first relay is closed for the pre-determined adjustable time and the second relay is open.