Intelligent energy-saving and environment-friendly refrigerator

Abstract

The application discloses an intelligent energy-saving and environment-friendly refrigerator, which comprises a box body, an upper sliding door, a lower sliding door, a winding assembly, a pull rope, an elastic element and a limiting assembly. The upper sliding door and the lower sliding door are slidably arranged at the opening of the box body, and the sliding doors are provided with a detection assembly for detecting whether the sliding doors are closed. The pull rope is provided with at least one group, and is arranged at two ends of the box body respectively. One end of the pull rope in the same group is connected with the winding assembly on the two sides respectively, and the other end of the pull rope is connected with the upper sliding door and the lower sliding door respectively. The winding assembly is arranged on the two sides of the box body, and the winding assembly pulls the upper sliding door and the lower sliding door to the two sides through the winding pull rope, so that the upper sliding door and the lower sliding door are closed. The elastic element is provided with one group, and is arranged between the upper sliding door and the pull rope and between the lower sliding door and the pull rope respectively. The limiting assembly is installed in the elastic element. The sliding door is automatically moved to control the automatic closing of the sliding door.

Description

TECHNICAL FIELD

[0001] The present application relates to a refrigerator, in particular to an intelligent energy-saving and environment-friendly refrigerator. BACKGROUND

[0002] The refrigerator is widely used in supermarkets, hotels and restaurants and other industries, and plays a role in refrigeration and preservation, and prolongs the shelf life of food. In the horizontal refrigerator in the supermarket or store, in order to save energy and reduce the overflow of cold air in the refrigerator, most horizontal refrigerator doors are composed of two glass sliding doors arranged vertically, so that customers can see the goods in the refrigerator at a glance, and customers can select goods first, and then open the sliding door to take out the goods.

[0003] For example, a horizontal refrigerator door drainage structure and a horizontal refrigerator with a publication number CN108397954A, including a cabinet door including a connected first extruded cabinet door and a second injection molded cabinet door, a slide for bearing the glass sliding door is arranged on the first extruded cabinet door, and the second injection molded cabinet door includes a side plate above the slide. When the glass sliding door closes the cabinet door, the glass sliding door contacts the side plate to achieve the closure of the glass sliding door to the refrigerator.

[0004] In the above-mentioned refrigerator, the customer selects the goods and opens the sliding door, and the customer needs to close the sliding door by himself, but some customers forget to close the sliding door of the refrigerator after opening the sliding door due to hurry, resulting in continuous overflow of cold air in the refrigerator. SUMMARY

[0005] The purpose of the present application is to provide an intelligent energy-saving and environment-friendly refrigerator, which automatically moves the sliding door and controls the automatic closing of the sliding door.

[0006] The above technical purpose of the present application is realized by the following technical scheme:

[0007] The utility model provides an intelligent energy -conserving environmental protection refrigerator, including box, upper sliding door, lower sliding door, winding assembly, pull cord, elastic element and restriction assembly, upper sliding door and lower sliding door are slidably arranged at the opening of box, and sliding door is equipped with detection assembly, is used for detecting whether the sliding door is closed or not, pull cord is equipped with at least one group, and is located two ends of box respectively, and one end of the pull cord of same group is connected with winding assembly on both sides respectively, and the other end of pull cord is connected with upper sliding door and lower sliding door respectively, winding assembly is arranged on both sides of box, winding assembly is driven to two sides by winding pull cord to upper sliding door and lower sliding door, makes it close, and when winding device stops, people can pull upper sliding door and lower sliding door, make it open, elastic element is equipped with a group, and is arranged between upper sliding door and pull cord and between lower sliding door and pull cord respectively, and the elastic element is deformed and generates the tension to upper sliding door and lower sliding door respectively in the pull cord pulling process, drives its movement, and the elongation of elastic element is A, restriction assembly is installed in elastic element, and when the elongation of elastic element exceeds A, control winding assembly to stop.

[0008] As preferred, the restriction assembly comprises a restriction elastic strip, a restriction spring, a moving block, and a restriction button. The restriction elastic strip is arranged between the pull cord and the sliding door, and the pull cord is connected with the sliding door through the restriction elastic strip. The upper sliding door and the lower sliding door are respectively provided with a protrusion, and the protrusion is provided with a mounting groove. One side of the mounting groove is provided with an opening in communication with the outside. The mounting groove is provided with a guide rod, and the direction of the guide rod is consistent with the direction of the restriction elastic strip. The middle position of the moving block is provided with a guide hole, and the guide rod passes through the guide hole. The moving block can slide on the guide rod. The restriction spring is sleeved on the guide rod, and the restriction spring has a pushing force opposite to the pulling force of the pull cord on the moving block. The end of the moving block away from the opening is fixedly connected with the restriction elastic strip. The restriction button is installed in the mounting groove and located at the end away from the opening. When the elongation of the elastic element is less than or equal to A, the restriction elastic strip is in a contracted state. When the elongation of the elastic element is greater than A, the restriction elastic strip is stretched, and gradually pulls the moving block to compress the restriction spring and move downward. The other end of the moving block presses down the restriction button, and the restriction button is pressed to control the winding device to stop.

[0009] As preferred, the detection assembly comprises a detection block, a detection spring and a detection button, the detection block is arranged on the lower sliding door and located at the position overlapped when the upper sliding door and the lower sliding door are closed, the edge of the lower sliding door is provided with a detection groove, the detection block is located in the detection groove, the both sides of the detection block are provided with sliding blocks, the detection groove is provided with a sliding groove, the sliding groove is not communicated with the outside, and the sliding blocks slide in the sliding groove, the detection spring is located in the detection groove and has an upward pushing force on the detection block, the detection button is installed on the bottom surface of the detection groove, the upper sliding door is provided with a placing groove, one side of the placing groove is provided with an inclined surface one, and the both sides of the detection block are provided with inclined surfaces two, the inclined surface one and the inclined surfaces two facilitate the detection block to move out of the placing groove, when the upper sliding door and the lower sliding door close the refrigerator, the detection block is located in the placing groove, at this time, the detection block is not in contact with the detection button, when the upper sliding door or the lower sliding door moves, the detection block moves out of the placing groove, so that the detection block is pressed by the upper sliding door, the bottom of the detection block presses the detection button, and the controller receives the information that the sliding door is not closed.

[0010] As preferred, when the detection assembly detects that the sliding door is not closed for 30 seconds, the winding assembly is started by the controller to close the sliding door.

[0011] As preferred, the winding assembly comprises a winding box, a winding wheel and a motor, the winding box is fixed on the side surface of the box body, the winding wheel and the motor are installed on the winding box, and the motor drives the winding wheel to rotate to wind the pull rope.

[0012] As preferred, the side surface of the box body is provided with a storage groove, the pull rope is located in the storage groove, the protruding block is located in the storage groove, there is a space between the bottom of the protruding block and the storage groove, a round hole is arranged between the storage groove and the winding box, and the pull rope passes through the round hole.

[0013] As preferred, the elastic element is a tension spring, one end of the tension spring is fixedly connected with the pull rope, the other end is fixedly connected with the protruding block, and the limiting elastic strip passes through the middle of the tension spring.

[0014] As preferred, a plurality of locking holes are arranged on the winding wheel, a through hole is arranged on the winding box, a locking rod passes through the through hole and the locking holes, one side of the locking rod is provided with a baffle, the other end is provided with a locking hole, and a door lock is installed at the locking hole.

[0015] The application has the following beneficial effects:

[0016] 1. When the detection assembly detects that the refrigerator is opened and not closed within 30 seconds, the winding assembly is controlled by the controller to pull the pull rope, the upper and lower sliding doors on the refrigerator are moved to two sides respectively, and the opening of the refrigerator is closed, so that the refrigerator is always opened and the cold air is always overflowed in the case of no attention is effectively prevented.

[0017] 2. The pull cord is connected to the sliding door via a tension spring. When the pull cord pulls the sliding door, the extension of the tension spring is A. At this time, the limiting elastic strip inside the tension spring is still not under external force and is not taut. However, during the movement of the sliding door, a new customer may push the sliding door open, causing the sliding door to move in the opposite direction of the pull cord. At this time, the force on the tension spring increases, causing the extension of the tension spring to exceed A. The limiting component then controls the motor to stop. The motor can rotate freely in both directions even when the power is off, allowing customers to push the sliding door to reverse the winding wheel and open the sliding door. After the upper and lower sliding doors are closed, they are blocked on both sides and cannot be pulled. During the continued winding process, the extension of the tension spring exceeds A, at which point the motor stops and winding stops.

[0018] 3. When the elongation of the tension spring exceeds A, the limiting elastic strip inside the tension spring becomes taut and stretched, exerting a pulling force on the moving block. This causes the moving block to move and compress the limiting spring. As the moving block moves back, it presses the limiting button, which stops the motor when the sliding door encounters resistance.

[0019] 4. When both the upper and lower sliding doors are closed, only a small portion overlaps. At this time, the detection block of the lower sliding door enters the placement slot under the upper sliding door. The detection block is not subjected to pressure from the upper sliding door. When either the upper or lower sliding door moves, the detection block moves out of the placement slot. During the movement, the detection block is pressed into the detection slot. Pressing the detection button in the detection slot transmits information to the controller. The time it takes for the detection button to be pressed is the time it takes for the freezer to open.

[0020] 5. By passing the locking rod through the locking hole on the winding box and the winding wheel, and locking the other end with the door lock, the winding wheel can be fixed in place, which can prevent outsiders from opening the freezer. Since the freezer is large and difficult to move, most small shops put the freezer outside. After the shop owner leaves, it is not safe to leave the freezer outside. By fixing the winding wheel, the sliding door can be prevented from opening. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a structural diagram of the detection block;

[0023] Figure 3 A cross-sectional view of the inspection component;

[0024] Figure 4 This is a diagram of the internal structure of the winding box;

[0025] Figure 5 This is a structural diagram of a tension spring;

[0026] Figure 6 Structure diagram of the limiting assembly;

[0027] Figure 7 A zone of Figure 6 enlarged view.

[0028] Reference signs: 1, cabinet; 2, upper sliding door; 3, lower sliding door; 4, pull rope; 5, limiting assembly; 501, limiting elastic strip; 502, protrusion; 503, moving block; 504, limiting button; 505, guide rod; 6, tension spring; 7, detection assembly; 701, detection block; 702, detection spring; 703, detection button; 8, winding assembly; 801, winding box; 802, motor; 803, winding wheel; 8031, locking hole; 9, storage groove; 10, locking rod; 11, door lock. DETAILED DESCRIPTION

[0029] See Figures 1 to 7 An intelligent energy-saving and environment-friendly refrigerator, comprising a cabinet 1, an upper sliding door 2, a lower sliding door 3, a winding assembly 8, a pull rope 4, an elastic element and a limiting assembly 5;

[0030] As Figure 1 and 2The upper sliding door 2 and the lower sliding door 3 are slidably arranged at the opening of the cabinet 1, and the sliding doors are provided with a detection assembly 7 for detecting whether the sliding doors are closed, the detection assembly 7 comprising a detection block 701, a detection spring 702 and a detection button 703, the detection block 701 being arranged on the lower sliding door 3 and located at a position overlapping when the upper sliding door 2 and the lower sliding door 3 are closed, the edge of the lower sliding door 3 being provided with a detection groove, the detection block 701 being located in the detection groove, the detection block 701 being provided with sliding blocks on both sides, the detection groove being provided with a sliding groove, the sliding groove not being in communication with the outside, and the sliding blocks being slidably located in the sliding groove, the movement of the detection block 701 being limited by the sliding blocks, so that the detection block 701 can only move up and down, and the detection block 701 will not fall out of the detection groove, the detection spring 702 being located in the detection groove, and the detection spring 702 having an upward thrust on the detection block 701, so that the detection block 701 can be away from the detection button, under the condition that the upper sliding door 2 and the lower sliding door 3 are both closed, the detection spring 702 pushes the detection block 701 into the placing groove, the detection button 703 being installed on the bottom surface of the detection groove, the upper sliding door 2 being provided with a placing groove, one side of the placing groove being provided with an inclined surface one, and both sides of the detection block 701 being provided with inclined surfaces two, the inclined surfaces one and two facilitating the detection block 701 to move out of the placing groove, when the upper sliding door 2 and the lower sliding door 3 close the refrigerator, the detection block 701 is just located in the placing groove, at this time, the detection block 701 is not in contact with the detection button 703, when the upper sliding door 2 or the lower sliding door 3 moves, the detection block 701 will move out of the placing groove, so that the detection block 701 is pressed down by the upper sliding door 2, so that the bottom of the detection block 701 presses down the detection button 703, and the controller receives information that the sliding doors are in an unclosed state, when the detection assembly 7 detects that the sliding doors are not closed for 30 seconds, that is, the time of pressing the detection button is continued for 30 seconds, the controller starts the winding assembly 8 to close the sliding doors.

[0031] As Figure 1 And 4 The pull rope 4 is provided with at least one group, and is located at both ends of the cabinet 1 respectively, one end of the pull rope 4 in the same group is connected with the winding assembly 8 on both sides respectively, the other end of the pull rope 4 is connected with the upper sliding door 2 and the lower sliding door 3 respectively, the winding assembly 8 is arranged on both sides of the cabinet 1, the winding assembly 8 pulls the upper sliding door 2 and the lower sliding door 3 to both sides by winding the pull rope 4, so that the upper sliding door 2 and the lower sliding door 3 are closed, and when the winding device stops, people can pull the upper sliding door 2 and the lower sliding door 3 to open them, the winding assembly 8 comprises a winding box 801, a winding wheel 803 and a motor 802, the winding box 801 is fixed on the side surface of the cabinet 1, the winding wheel 803 and the motor 802 are installed in the winding box 801, the motor 802 drives the winding wheel 803 to rotate to wind the pull rope 4 on the winding wheel 803.

[0032] As Figure 4The winding wheel 803 is provided with a plurality of locking holes 8031, the winding box 801 is provided with a through hole, the locking rod 10 passes through the through hole and the locking hole 8031, and the locking rod 10 is provided with a baffle on one side and a locking hole on the other end, and a door lock 11 is installed on the locking hole. After the sliding door is closed, the refrigerator is generally placed outside the small shop due to its large volume and is not easy to move. After the shop owner leaves, in order to ensure the safety of the goods in the refrigerator, the refrigerator is not safe when placed outside. The winding wheel 803 can be fixed by passing the locking rod 10 through the through hole and the locking hole 8031, so that the winding wheel 803 can drive the upper and lower sliding doors to move, and also can prevent the sliding door from being opened, and the refrigerator outside can not be opened.

[0033] As Figure 5 The elastic element is a tension spring 6, and a group of tension springs 6 are arranged between the upper sliding door 2 and the pull rope 4, and the pull rope 4 is connected with the tension spring 6 through a connecting plate. The pull rope 4 is arranged between the lower sliding door 3 and the pull rope 4. In the pulling process of the pull rope 4, the tension spring 6 is deformed to generate a pulling force on the upper sliding door 2 and the lower sliding door 3 respectively, and drives the upper sliding door 2 and the lower sliding door 3 to move. At this time, the elongation of the tension spring 6 is A, and the pulling force of the tension spring 6 is the elongation multiplied by the elastic coefficient. Since the force of sliding friction is the same as the elastic force of the tension spring 6 when the elongation is A, the tension spring 6 always maintains the elongation A during the pulling process.

[0034] As Figures 5 to 7The limiting assembly 5 is installed in the elastic element, the limiting assembly 5 comprises a limiting elastic strip 501, a limiting spring, a moving block 503 and a limiting button 504, the limiting elastic strip 501 is arranged between the pull rope 4 and the sliding door, the pull rope 4 is connected with the sliding door through the limiting elastic strip 501, the upper sliding door 2 and the lower sliding door 3 are respectively provided with a protrusion 502, the protrusion 502 is provided with a mounting groove, one side of the mounting groove is provided with an opening communicated with the outside, the mounting groove is provided with a guide rod 505, the direction of the guide rod 505 is consistent with the direction of the limiting elastic strip 501, a guide hole is arranged in the middle position of the moving block 503, the guide rod 505 passes through the guide hole, the moving block 503 can slide on the guide rod 505, the limiting spring is sleeved on the guide rod 505, and the limiting spring has a pushing force opposite to the pulling force of the pull rope 4 on the moving block 503, the end of the moving block 503 located at the opening is fixedly connected with the limiting elastic strip 501, and the limiting button 504 is installed in the mounting groove and located at the end far away from the opening. The pull rope 4 is connected with the sliding door through the stretching spring 6, when the pull rope 4 pulls the sliding door, the elongation of the stretching spring 6 is A, at this time, the limiting elastic strip 501 in the stretching spring 6 is still not subjected to external force and is not straightened under stress, but in the process of moving the sliding door, a new customer may push the sliding door to open again, so that the sliding door moves in the opposite direction along the pull rope 4, at this time, the force on the stretching spring increases, so that the elongation of the stretching spring 6 exceeds A, at this time, the limiting assembly 5 controls the motor 802 to stop, and the motor 802 can be reversely rotated at will under the condition of power-off, so that the customer reversely rotates the winding wheel 803 by pushing the sliding door, and the sliding door is opened. The upper and lower sliding doors are closed, and the two sides cannot be pulled to continue the winding process, the elongation of the stretching spring 6 exceeds A, at this time, the motor 802 stops, and the winding stops, and because the maximum static friction force is greater than the sliding friction force, before the pull rope 4 pulls the sliding plate, the elongation of the spring will be greater than the elongation A of the sliding friction force for a period of time, at this time, even if the elongation is greater than A, the limiting spring can exert a counter force on the moving block 503, so that the moving block 503 cannot press the limiting button 504 under the maximum static friction force.

[0035] As Figure 5 The box body 1 is provided with a storage groove 9, and the pull rope 4 is located in the storage groove 9, the protrusion 502 is located in the storage groove 9, there is a space between the bottom of the protrusion 502 and the storage groove 9, a circular hole is arranged between the storage groove 9 and the winding box 801, the pull rope 4 passes through the circular hole, after the customer consciously closes the sliding door after opening the sliding door, the pull rope 4 has been pulled out completely, at this time, the gap between the storage groove 9 and the bottom of the protrusion 502 can be used as a placement position of the pull rope 4, and the accumulated pull rope 4 will not affect the opening and closing of the sliding door.

[0036] The working principle of the present application: after the detection button 703 of the detection assembly 7 is pressed for 30 seconds, the controller knows that the refrigerator is not closed within 30 seconds after being opened, at which time the motor 802 is started to pull the pull rope 4, and the upper and lower sliding doors on the refrigerator are moved to the two sides respectively to close the opening of the refrigerator, effectively preventing the refrigerator from being continuously opened and the cold air from continuously overflowing in the case of no one paying attention. In the process of pulling the sliding doors to the two sides, if the customer reopens the sliding doors, the elongation of the tension spring 6 exceeds A, at which time the limiting elastic strip 501 in the tension spring 6 is straightened and stretched, there is a pulling force on the moving block 503, the moving block 503 moves to compress the limiting spring, and the moving block 503 moves back to press the limiting button 504, after the limiting button 504 is pressed, the motor 802 is stopped, the motor 802 can be stopped in time when the sliding door is resisted, and the sliding door can be pulled by the customer.

Claims

1. An intelligent, energy-saving, and environmentally friendly freezer, characterized in that: Includes a housing (1), an upper sliding door (2), a lower sliding door (3), a winding assembly (8), a pull rope (4), elastic elements, and a restraining assembly (5); The upper sliding door (2) and the lower sliding door (3) are slidably disposed at the opening of the box (1), and the sliding door is provided with a detection component (7) for detecting whether the sliding door is closed; At least one set of pull ropes (4) is provided, and they are located at both ends of the box body (1). One end of the pull ropes (4) in the same set is connected to the winding components (8) on both sides, and the other end of the pull ropes (4) is connected to the upper sliding door (2) and the lower sliding door (3) respectively. The winding assembly (8) is set on both sides of the box (1). The winding assembly (8) pulls the upper sliding door (2) and the lower sliding door (3) to the sides through the winding pull rope (4) to close them. When the winding device stops, people can pull the upper sliding door (2) and the lower sliding door (3) to open them. A set of elastic elements is provided, and they are respectively set between the upper sliding door (2) and the pull rope (4), and between the lower sliding door (3) and the pull rope (4). During the pulling process of the pull rope (4), the elastic elements deform and generate pulling force on the upper sliding door (2) and the lower sliding door (3), which drives them to move. At this time, the elongation of the elastic element is A. The limiting component (5) is installed inside the elastic element. When the elongation of the elastic element exceeds A, the winding component (8) is controlled to stop. The limiting component (5) includes a limiting elastic strip (501), a limiting spring, a moving block (503), and a limiting button (504). The limiting elastic strip (501) is disposed between the pull rope (4) and the sliding door. The pull rope (4) is connected to the sliding door through the limiting elastic strip (501). The upper sliding door (2) and the lower sliding door (3) are respectively provided with protrusions (502). The protrusions (502) are provided with mounting grooves. One side of the mounting groove is provided with an opening communicating with the outside. The mounting groove is provided with a guide rod (505). The direction of the guide rod (505) is consistent with the direction in which the limiting elastic strip (501) enters. The moving block (503) is provided with a guide hole in the middle position. The guide rod (505) passes through the guide hole, and the moving block (503) can... The guide rod (505) slides, the limiting spring is sleeved on the guide rod (505), and the limiting spring has a thrust on the moving block (503) opposite to the pulling force of the pull rope (4). The moving block (503) is fixedly connected to the limiting elastic strip (501) at the end of the opening. The limiting button (504) is installed in the mounting groove and is located at the end away from the opening. When the elongation of the elastic element is less than or equal to A, the limiting elastic strip (501) is in a contracted state. When the elongation of the elastic element is greater than A, the limiting elastic strip (501) straightens and gradually pulls the moving block (503), compressing the limiting spring downward, so that the other end of the moving block (503) presses down on the limiting button (504). The limiting button (504) is pressed to control the winding device to stop. The detection component (7) includes a detection block (701), a detection spring (702), and a detection button (703). The detection block (701) is mounted on the lower sliding door (3) and is located at the overlapping position when the upper sliding door (2) and the lower sliding door (3) are closed. The edge of the lower sliding door (3) is provided with a detection groove, and the detection block (701) is located in the detection groove. Slider blocks are provided on both sides of the detection block (701). A sliding groove is provided in the detection groove, and the sliding groove is not connected to the outside. The slider slides in the sliding groove. The detection spring (702) is located in the detection groove, and the detection spring (702) has an upward pushing force on the detection block (701). The detection button (703) is mounted on... The bottom surface of the detection slot is provided with a placement slot on the upper sliding door (2). One side of the placement slot is set as a slope one, and the two sides of the detection block (701) are set as slope two. Slope one and slope two facilitate the movement of the detection block (701) out of the placement slot. When the upper sliding door (2) and the lower sliding door (3) close the freezer, the detection block (701) is located in the placement slot. At this time, the detection block (701) is not in contact with the detection button (703). When the upper sliding door (2) or the lower sliding door (3) moves, the detection block (701) will move out of the placement slot, so that the detection block (701) is pressed by the upper sliding door (2), so that the detection button (703) is pressed at the bottom of the detection block (701), and the controller receives the information that the sliding door is not closed.

2. The intelligent energy-saving and environmentally friendly freezer according to claim 1, characterized in that: When the detection component (7) detects that the sliding door is not closed for 30 seconds, it activates the winding component (8) through the controller to close the sliding door.

3. The intelligent energy-saving and environmentally friendly freezer according to claim 1, characterized in that: The winding assembly (8) includes a winding box (801), a winding wheel (803), and a motor (802). The winding box (801) is fixed to the side of the box body (1). The winding wheel (803) and the motor (802) are installed in the winding box (801). The motor (802) drives the winding wheel (803) to rotate and wind up the pull rope (4).

4. The intelligent energy-saving and environmentally friendly freezer according to claim 1, characterized in that: The box (1) has a storage slot (9) on its side, and the pull rope (4) is located in the storage slot (9). The protrusion (502) is located in the storage slot (9). There is a space between the bottom of the protrusion (502) and the storage slot (9). A round hole is provided between the storage slot (9) and the winding box (801), and the pull rope (4) passes through the round hole.

5. The intelligent energy-saving and environmentally friendly freezer according to claim 1, characterized in that: The elastic element is a tension spring (6), one end of which is fixedly connected to the pull rope (4) and the other end is fixedly connected to the protrusion (502), and the elastic strip (501) is restricted from passing through the middle of the tension spring (6).

6. The intelligent energy-saving and environmentally friendly freezer according to claim 3, characterized in that: The winding wheel (803) is provided with several locking holes (8031), the winding box (801) is provided with a through hole, the locking rod (10) passes through the through hole and the locking hole (8031), and the locking rod (10) is provided with a baffle on one side and a lock hole on the other end, and a door lock (11) is installed at the lock hole.

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