Education robot for aided teaching based on AI education

Abstract

The AI education-based teaching-aided education robot is applied to the technical field of education robots and comprises a robot body, a base is fixedly mounted at the bottom of the robot body, two connecting structures are welded to the top of the base, each connecting structure comprises a movable gear, and the movable gears are fixedly mounted on the base. A limiting shell is welded to the top of the movable gear, and an inner cavity of the limiting shell is fixedly connected with a limiting rod. When a user needs to protect a robot body after normal use, the user resets a limiting shell at the moment, a protection plate and a fixing rod are put into an inner cavity of a fixing shell again, then the user drives a first protection shell and the fixing rod to enter the inner cavity of the fixing shell, and the position of the fixing rod is positioned; and then, after the user clamps the position of the fixing rod through an anti-skid rod and an anti-skid sleeve fixed to a second protection shell, through rubber layers arranged on the surfaces of a protection plate, the first protection shell and the second protection shell, protection on the robot body after normal use is completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of educational robots, and in particular relates to an educational robot for auxiliary teaching based on AI education. Background Art

[0002] Educational robots are intelligent devices that combine educational software and robotic hardware, designed to help students learn. They integrate cutting-edge technologies such as robotics, artificial intelligence, big data and cloud computing, and provide students with efficient, interesting and personalized learning experiences through interactive teaching, personalized tutoring and intelligent assessment.

[0003] At present, a Chinese invention with the announcement number of CN219504775U discloses a humanoid educational robot, including a shell, a circuit board is fixedly installed inside the shell, an intelligent education module and a power module are respectively installed on the top and bottom of the circuit board, and buffer blocks are movably connected to the top and bottom of the shell; when the humanoid educational robot falls forward or backward, the buffer block first contacts the ground to prevent the robot body from directly colliding with the ground and being damaged, and at the same time, two insulating sheets can cut off the two connectors and the conductive ends of the intelligent education module to prevent the robot arm from still moving after the robot falls, and when the back collides, the two conductive contact blocks move up to align the two through grooves with the two conductive rods of the power module, cutting off the power supply of the power module to the intelligent education module, thereby disconnecting the educational robot after the fall for protection, thereby facilitating the protective use of the humanoid educational robot.

[0004] When in use, existing educational robots cannot illuminate in dim lights or power outages, resulting in the robot's screen display being unable to be seen clearly during the learning process, interrupting the user's learning process and affecting the continuity of learning. In addition, in normal use of the robot, the robot is placed on the ground or on a table after use, which is prone to accidental collisions due to human activities, causing damage to its outer shell or display screen, which not only affects the appearance, but also causes the internal structure to be exposed, affecting the stability of the robot's operation. Summary of the invention

[0005] The purpose of the present invention is to provide an educational robot for auxiliary teaching based on AI education, which has the advantages of providing lighting in the event of a power outage and protecting the robot body after normal use.

[0006] The above-mentioned technical purpose of the present invention is achieved through the following technical solutions: an educational robot for auxiliary teaching based on AI education, comprising a robot body, a base fixedly installed at the bottom of the robot body, two connecting structures welded on the top of the base, the connecting structure comprising a movable gear, a limiting shell welded on the top of the movable gear, the inner cavity of the limiting shell fixedly connected to a limiting rod, the surface of the limiting rod is sleeved with a gear 1, tooth plates 1 and 2 are respectively meshed on both sides of the gear 1, a limiting plate is fixedly installed on the top of the tooth plate 1, a positioning frame is fixedly installed on the top of the tooth plate 2, the inner cavity of the positioning frame is provided with a lighting lamp, protective plates are provided on the front and rear sides of the robot body, protective shells 1 and 2 are respectively provided on both sides of the robot body, and the bottoms of the protective plates, protective shells 1 and 2 are fixedly connected with positioning structures.

[0007] The above technical solution is adopted: when the user needs to provide lighting during a power outage, at this time, the user separates the protective plate, protective shell 1 and the structure connected to it driven by the protective shell from the retaining shell, and then the user separates the locking shell from the limiting plate, and brings the limiting shell out of the inner cavity of the robot body through the limiting plate. When the limiting shell moves to the appropriate position, the user drives the limiting shell to rotate. When the limiting shell rotates to the specified angle, the user stops rotating the limiting shell and presses the limiting plate to drive the tooth plate 1 to move downward. The tooth plate 1 drives the tooth plate 2 to move upward through the gear 1. After the tooth plate 2 moves to the specified position, the engagement of the gear 2 and the limiting tooth plate drives the lighting lamp to move in a circular manner. When the lighting lamp moves to After specifying the angle, the user re-fixes the position of the limit plate through the magnets in the limit grooves opened on both sides of the limit shell, thereby completing the lighting in the event of a power outage. When the user needs to protect the robot body after normal use, the user resets the limit shell, first puts the protective plate and the retaining rod back into the inner cavity of the retaining shell, and then the user drives the protective shell one and the fixing rod into the inner cavity of the retaining shell and locates the position of the fixing rod. Then the user clamps the position of the fixing rod through the anti-slip rod and the anti-slip sleeve fixed to the protective shell two, and then completes the protection of the robot body after normal use through the rubber layer arranged on the surface of the protective plate, protective shell one and protective shell two.

[0008] The present invention is further configured such that gear 2 is fixedly connected to both sides of the lighting lamp, and limiting toothed plates are fixedly installed on the tops of opposite sides of the two limiting shells.

[0009] By adopting the above technical solution: by setting gear 2 and a limit tooth plate, the angle of the lighting lamp can be automatically adjusted when the user drives the lighting lamp to rise or fall through the engagement of gear 1 and tooth plate 2, so that the user can complete the lighting after a power outage.

[0010] The present invention is further configured such that the connection structure includes a positioning plate, the top of the positioning plate is slidably connected to a positioning shell, the bottom of the inner cavity of the positioning shell is fixedly connected to a spring 1, the top of the spring 1 is fixedly connected to a positioning gear, and the top of the positioning gear is meshed with a movable gear.

[0011] The above technical solution is adopted: by setting the positioning plate, positioning shell, spring 1, positioning gear and movable gear in the connecting structure, the position of the limiting shell is fixed after the user adjusts the angle of the limiting shell, preventing the angle of the limiting shell from shifting during use.

[0012] The present invention is further configured such that a positioning rod is fixedly connected to the bottom of the positioning gear, and the bottom of the positioning rod is fixedly connected to the positioning shell.

[0013] The above technical solution is adopted: by providing a positioning rod, the positioning gear is prevented from rotating itself due to the rotation of the movable gear when in use, thereby affecting the positioning effect of the limit shell.

[0014] The present invention is further configured as follows: the positioning structure includes a retaining shell, the bottom of the retaining shell is fixedly connected to the base, the inner cavity of the retaining shell is movably connected with a retaining rod, the top of the retaining rod is fixedly connected to the protective plate, the inner cavity of the retaining shell is slidably connected with a fixing rod, the left side of the fixing rod is fixedly connected to protective shell one, the right side of the top of the fixing rod is inserted with an anti-slip rod and an anti-slip sleeve, and the top of the anti-slip sleeve is fixedly connected to protective shell two.

[0015] By adopting the above technical solution: by setting the positioning structure, the retaining shell, the retaining rod, the fixing rod, the anti-slip rod and the anti-slip sleeve in coordination with each other, it is convenient for the user to quickly install the protective structure and the robot body, thereby facilitating the protection of the robot body.

[0016] The present invention is further configured such that a connecting rod is fixedly connected to one side of the limiting shell opposite to the top and the bottom, a spring 2 is fixedly connected to the side of the connecting rod away from the inner cavity of the limiting shell, and the two springs 2 are fixedly connected to tooth plate 1 and tooth plate 2 on one side away from the connecting rod, respectively.

[0017] By adopting the above technical solution, by setting the connection rod and the second spring for use, the tooth plate one and the tooth plate two can be quickly returned to their original positions after lighting is completed, so as to facilitate the next use by the user.

[0018] The present invention is further configured such that the front side and the rear side of the connecting rod are fixedly connected with a locking rod, and the opposite sides of every two locking rods are fixedly connected to the inner cavities of the tooth plate 1 and the tooth plate 2 respectively.

[0019] By adopting the above technical solution: by setting a locking rod, the moving position of tooth plate one and tooth plate two can be fixed when tooth plate one and tooth plate two are returned to their original position by spring two after use by the user, thereby preventing the position of tooth plate one and tooth plate two from shifting during movement.

[0020] The present invention is further configured such that two limiting rings are welded on the surface of the limiting rod, and opposite sides of the two limiting rings are in contact with gear one.

[0021] The above technical solution is adopted: by setting a limit ring, when the gear is lifted and lowered through tooth plate one and tooth plate two, the position of gear one and the limit rod is fixed to prevent the position of gear one from shifting during use.

[0022] The present invention is further configured such that a locking shell is sleeved on the surface of the limiting plate, and a side of the locking shell close to the limiting shell is magnetically connected to the inner cavity of the limiting shell.

[0023] By adopting the above technical solution, the position of the limit plate can be fixed after the limit plate is moved by setting the locking shell, so as to prevent the position of the limit plate from being offset after the movement.

[0024] The present invention is further configured such that a clamping block is fixedly connected to one side of the tooth plate 1 and the tooth plate 2 opposite to the front side and the rear side, and the surface of the clamping block is slidably connected to the inner cavity of the limiting shell.

[0025] By adopting the above technical solution, by setting a clamping block, the positions of tooth plate one and tooth plate two can be fixed when tooth plate one and tooth plate two move, thereby preventing the positions of tooth plate one and tooth plate two from shifting when moving.

[0026] In summary, the present invention has the following beneficial effects:

[0027] 1. When the user needs to illuminate in the case of a power outage, at this time, the user disengages the protective plate, the protective shell 1 and the structure connected to the protective shell from the retaining shell, and then uses the locking shell to disengage the limiting plate, and then brings the limiting shell out of the inner cavity of the robot body through the limiting plate. When the limiting shell moves to the appropriate position, the user drives the limiting shell to rotate. When the limiting shell rotates to the specified angle, the user stops rotating the limiting shell and presses the limiting plate to drive the tooth plate 1 to move downward. The tooth plate 1 drives the tooth plate 2 to move upward through the gear 1. After the tooth plate 2 moves to the specified position, the engagement of the gear 2 and the limiting tooth plate drives the lighting lamp to move in a circular manner. When the lighting lamp moves to the specified angle, the user re-fixes the position of the limiting plate with the magnet in the limiting groove opened on both sides of the limiting shell, thereby completing the lighting in the case of a power outage. By setting the gear 2 and the limiting tooth plate, the angle of the lighting lamp can be automatically adjusted when the user drives the lighting lamp to rise and fall through the engagement of the gear 1 and the tooth plate 2, so as to facilitate the user to complete the lighting after the power outage;

[0028] 2. When the user needs to protect the robot body after normal use, the user resets the limit shell, first puts the protective plate and the retaining rod back into the inner cavity of the retaining shell, and then the user drives the protective shell 1 and the fixing rod into the inner cavity of the retaining shell and locates the position of the fixing rod. Then the user clamps the position of the fixing rod through the anti-slip rod and the anti-slip sleeve fixed to the protective shell 2, and completes the protection of the robot body after normal use through the rubber layer arranged on the surface of the protective plate, protective shell 1 and protective shell 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a front cross-sectional view of a local structure of the present invention;

[0031] Figure 3 It is a disassembled diagram of the connection structure of the present invention;

[0032] Figure 4 It is a disassembled diagram of the positioning structure of the present invention.

[0033] 1. Robot body; 2. Base; 3. Connecting structure; 301. Positioning plate; 302. Positioning shell; 303. Spring 1; 304. Positioning gear; 305. Movable gear; 306. Positioning rod; 4. Limiting shell; 5. Limiting rod; 6. Gear 1; 7. Tooth plate 1; 8. Tooth plate 2; 9. Limiting plate; 10. Positioning frame; 11. Illuminating lamp; 12. Protective plate; 13. Protective shell 1; 14. Protective shell 2; 15. Positioning structure; 1501. Retaining shell; 1502. Retaining rod; 1503. Fixed rod; 1504. Anti-slip rod; 1505. Anti-slip sleeve; 16. Gear 2; 17. Limiting tooth plate; 18. Connecting rod; 19. Spring 2; 20. Positioning rod; 21. Limiting ring; 22. Positioning shell; 23. Block. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0035] Embodiment 1:

[0036] refer to Figure 1 and Figure 4 An educational robot for auxiliary teaching based on AI education includes a robot body 1, a base 2 is fixedly installed at the bottom of the robot body 1, two connecting structures 3 are welded on the top of the base 2, the connecting structure 3 includes a movable gear 305, a limiting shell 4 is welded on the top of the movable gear 305, a limiting rod 5 is fixedly connected to the inner cavity of the limiting shell 4, a gear 1 6 is sleeved on the surface of the limiting rod 5, a tooth plate 1 7 and a tooth plate 2 8 are respectively meshed on both sides of the gear 1 6, a limiting plate 9 is fixedly installed on the top of the tooth plate 1 7, a positioning frame 10 is fixedly installed on the top of the tooth plate 2 8, and an illuminating lamp 11 is arranged in the inner cavity of the positioning frame 10.

[0037] Furthermore, gears 2 16 are fixedly connected to both sides of the lighting lamp 11 , and limiting toothed plates 17 are fixedly installed on the tops of the two limiting shells 4 on opposite sides.

[0038] Furthermore, the connecting structure 3 includes a positioning plate 301, the top of the positioning plate 301 is slidably connected to a positioning shell 302, the bottom of the inner cavity of the positioning shell 302 is fixedly connected to a spring 1 303, the top of the spring 1 303 is fixedly connected to a positioning gear 304, and the top of the positioning gear 304 is meshed with a movable gear 305.

[0039] Furthermore, a positioning rod 306 is fixedly connected to the bottom of the positioning gear 304 , and a bottom of the positioning rod 306 is fixedly connected to the positioning shell 302 .

[0040] Furthermore, the positioning structure 15 includes a retaining shell 1501, the bottom of which is fixedly connected to the base 2, the inner cavity of the retaining shell 1501 is movably connected with a retaining rod 1502, the top of the retaining rod 1502 is fixedly connected to the protective plate 12, the inner cavity of the retaining shell 1501 is slidably connected with a fixing rod 1503, the left side of the fixing rod 1503 is fixedly connected to the protective shell 1 13, the right side of the top of the fixing rod 1503 is inserted with an anti-slip rod 1504 and an anti-slip cover 1505, and the top of the anti-slip cover 1505 is fixedly connected to the protective shell 2 14.

[0041] Brief description of the use process: When the user needs to provide lighting in the case of a power outage, at this time, the user drives the protective plate 12, the protective shell 13 and the protective shell 14 to drive the structure connected thereto to disengage from the retaining shell 1501, and then uses the locking shell 22 to disengage from the limiting plate 9, and then brings the limiting shell 4 out of the inner cavity of the robot body 1 through the limiting plate 9. When the limiting shell 4 moves to the appropriate position, the user drives the limiting shell 4 to rotate. When the limiting shell 4 rotates to the specified angle, the user stops rotating the limiting shell 4 and presses the limiting plate 9 to drive the tooth plate 17 to move downward. The tooth plate 17 drives the tooth plate 28 to move upward through the gear 16. After the tooth plate 28 moves to the specified position, the engagement of the gear 2 16 and the limiting tooth plate 17 drives the lighting lamp 11 to move in a circular manner. When the lighting lamp 11 moves to the specified angle, the user re-fixes the position of the limiting plate 9 with the magnets in the limiting grooves opened on both sides of the limiting shell 4, thereby completing the lighting in the case of a power outage. By setting the gear 2 16 and the limiting toothed plate 17 can automatically adjust the angle of the lighting lamp 11 when the user drives the lighting lamp 11 to rise and fall through the meshing of the gear 1 6 and the toothed plate 2 8, so as to facilitate the user to complete the lighting after a power outage. By setting the positioning plate 301, the positioning shell 302, the spring 1 303, the positioning gear 304 and the movable gear 305 in the connecting structure 3, the position of the limiting shell 4 is fixed after the user adjusts the angle of the limiting shell 4 to prevent the angle of the limiting shell 4 from shifting during use. By setting the positioning rod 306, the positioning gear 304 is prevented from rotating due to the rotation of the movable gear 305 during use, thereby affecting the positioning effect of the limiting shell 4. By setting the positioning structure 15, the retaining shell 1501, the retaining rod 1502, the fixing rod 1503, the anti-slip rod 1504 and the anti-slip sleeve 1505 are used in cooperation, so as to facilitate the user to quickly install the protective structure and the robot body 1, so as to facilitate the protection of the robot body 1.

[0042] Embodiment 2:

[0043] refer to Figure 1 and Figure 2An educational robot for auxiliary teaching based on AI education includes a robot body 1. The front and rear sides of the robot body 1 are both provided with protective plates 12. Both sides of the robot body 1 are respectively provided with a protective shell 13 and a protective shell 2 14. The bottoms of the protective plate 12, the protective shell 1 13 and the protective shell 2 14 are fixedly connected with a positioning structure 15.

[0044] Furthermore, a connecting rod 18 is fixedly connected to the side opposite to the top and bottom of the limiting shell 4, and a spring 2 19 is fixedly connected to the side of the connecting rod 18 away from the inner cavity of the limiting shell 4. The two springs 19 are fixedly connected to tooth plate 1 7 and tooth plate 2 8 on the side away from the connecting rod 18 respectively.

[0045] Furthermore, the front and rear sides of the connecting rod 18 are fixedly connected with the locking rods 20, and the opposite sides of every two locking rods 20 are fixedly connected to the inner cavities of the tooth plate 1 7 and the tooth plate 2 8 respectively.

[0046] Furthermore, two limiting rings 21 are welded on the surface of the limiting rod 5 , and opposite sides of the two limiting rings 21 are in contact with the gear 1 6 .

[0047] Furthermore, a locking shell 22 is sleeved on the surface of the limiting plate 9 , and a side of the locking shell 22 close to the limiting shell 4 is magnetically connected to the inner cavity of the limiting shell 4 .

[0048] Furthermore, a clamping block 23 is fixedly connected to the opposite sides of the front and rear sides of the tooth plate 1 7 and the tooth plate 2 8 , and the surface of the clamping block 23 is slidably connected to the inner cavity of the limiting shell 4 .

[0049] Brief description of the usage process: when the user needs to protect the robot body 1 after normal use, the user resets the limit shell 4, first puts the protective plate 12 and the retaining rod 1502 back into the inner cavity of the retaining shell 1501, and then the user drives the protective shell 1 13 and the fixing rod 1503 into the inner cavity of the retaining shell 1501 and locates the position of the fixing rod 1502, and then the user clamps the position of the fixing rod 1503 through the anti-slip rod 1504 and the anti-slip sleeve 1505 fixed to the protective shell 2 14, and then the rubber layer arranged on the surface of the protective plate 12, the protective shell 1 13 and the protective shell 2 14 is used to complete the protection of the robot body 1 after normal use, and by setting the connecting rod 18 and the spring 2 19 for use, the tooth plate 1 7 and the tooth plate 2 8 can be quickly returned to their original positions after the lighting is completed, which is convenient for use. The next time the user uses it, by setting the locking rod 20, the moving position of the tooth plate 17 and the tooth plate 28 can be fixed when the spring 219 returns the tooth plate 17 and the tooth plate 28 after use, so as to prevent the position of the tooth plate 17 and the tooth plate 28 from shifting during movement. By setting the limiting ring 21, when the gear is lifted and lowered by the tooth plate 17 to the tooth plate 28, the position of the gear 16 on the limiting rod 5 can be fixed to prevent the position of the gear 16 from shifting during use. By setting the locking shell 22, the position of the limiting plate 9 can be fixed after the limiting plate 9 is moved to prevent the position of the limiting plate 9 from shifting after the movement. By setting the blocking block 23, the position of the tooth plate 17 and the tooth plate 28 can be fixed when the tooth plate 17 and the tooth plate 28 are moved to prevent the position of the tooth plate 17 and the tooth plate 28 from shifting during movement.

[0050] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An educational robot for auxiliary teaching based on AI education, comprising a robot body (1), characterized in that: A base (2) is fixedly installed at the bottom of the robot body (1), and two connection structures (3) are welded on the top of the base (2). The connection structure (3) includes a movable gear (305). A limit shell (4) is welded on the top of the movable gear (305). A limit rod (5) is fixedly connected to the inner cavity of the limit shell (4). A gear 1 (6) is sleeved on the surface of the limit rod (5). A tooth plate 1 (7) and a tooth plate 2 (8) are respectively meshed on both sides of the gear 1 (6). The tooth plate 1 (7) and the tooth plate 2 (8) are meshed on both sides of the gear 1 (6). A limiting plate (9) is fixedly installed on the top of the tooth plate 7, a positioning frame (10) is fixedly installed on the top of the tooth plate 2 (8), an inner cavity of the positioning frame (10) is provided with an illumination lamp (11), a protective plate (12) is provided on the front and rear sides of the robot body (1), a protective shell 1 (13) and a protective shell 2 (14) are respectively provided on both sides of the robot body (1), and the bottoms of the protective plate (12), the protective shell 1 (13) and the protective shell 2 (14) are fixedly connected with a positioning structure (15).

2. The educational robot for auxiliary teaching based on AI education according to claim 1, characterized in that: Gear 2 (16) is fixedly connected to both sides of the lighting lamp (11), and limiting toothed plates (17) are fixedly installed on the tops of the opposite sides of the two limiting shells (4).

3. The educational robot for auxiliary teaching based on AI education according to claim 1, characterized in that: The connection structure (3) comprises a positioning plate (301), the top of the positioning plate (301) is slidably connected to a positioning shell (302), the bottom of the inner cavity of the positioning shell (302) is fixedly connected to a spring 1 (303), the top of the spring 1 (303) is fixedly connected to a positioning gear (304), and the top of the positioning gear (304) is meshed with a movable gear (305).

4. The educational robot for auxiliary teaching based on AI education according to claim 3, characterized in that: The bottom of the positioning gear (304) is fixedly connected to a positioning rod (306), and the bottom of the positioning rod (306) is fixedly connected to the positioning shell (302).

5. The educational robot for auxiliary teaching based on AI education according to claim 1, characterized in that: The positioning structure (15) comprises a retaining shell (1501), the bottom of which is fixedly connected to the base (2), the inner cavity of the retaining shell (1501) is movably connected to a retaining rod (1502), the top of which is fixedly connected to the protective plate (12), the inner cavity of the retaining shell (1501) is slidably connected to a fixing rod (1503), the left side of which is fixedly connected to the protective shell one (13), the right side of the top of the fixing rod (1503) is plugged with an anti-slip rod (1504) and an anti-slip sleeve (1505), and the top of the anti-slip sleeve (1505) is fixedly connected to the protective shell two (14).

6. The educational robot for auxiliary teaching based on AI education according to claim 1, characterized in that: The side opposite to the top and bottom of the limiting shell (4) is fixedly connected to a connecting rod (18), and the side of the connecting rod (18) away from the inner cavity of the limiting shell (4) is fixedly connected to a second spring (19), and the sides of the two second springs (19) away from the connecting rod (18) are respectively fixedly connected to the first tooth plate (7) and the second tooth plate (8).

7. The educational robot for auxiliary teaching based on AI education according to claim 6, characterized in that: The front and rear sides of the connecting rod (18) are fixedly connected to a locking rod (20), and the opposite sides of each two locking rods (20) are fixedly connected to the inner cavities of tooth plate 1 (7) and tooth plate 2 (8), respectively.

8. The educational robot for auxiliary teaching based on AI education according to claim 1, characterized in that: Two limiting rings (21) are welded on the surface of the limiting rod (5), and opposite sides of the two limiting rings (21) are in contact with gear one (6).

9. The educational robot for auxiliary teaching based on AI education according to claim 1, characterized in that: A locking shell (22) is sleeved on the surface of the limiting plate (9), and a side of the locking shell (22) close to the limiting shell (4) is magnetically connected to the inner cavity of the limiting shell (4).

10. The educational robot for auxiliary teaching based on AI education according to claim 1, characterized in that: The tooth plate 1 (7) and the tooth plate 2 (8) are both fixedly connected with a clamping block (23) on the opposite sides of the front and rear sides, and the surface of the clamping block (23) is slidably connected with the inner cavity of the limiting shell (4).

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