Simulation training device for adjusting oil needle of aviation piston type engine

Abstract

The utility model discloses a simulation training device for oil needle adjustment of an aviation piston type engine. The simulation training device comprises an industrial personal computer case, an oil needle assembly and an angle sensor. The number of the angle sensors is two, a sensor shaft is hinged to each angle sensor, the oil needle assembly comprises a main oil needle, an idling oil needle and a fixing piece, and the main oil needle and the idling oil needle can penetrate through the box body to be coaxially connected with the sensor shaft of each angle sensor and drive the sensor shafts to rotate synchronously. According to the oil needle adjusting simulation training device, operators / trainees can repeatedly practice for a long time, it is ensured that the operators / trainees can achieve relatively skilled operation skills and have relatively rich operation experience, and meanwhile, due to the fact that training on a real aviation piston type sending machine is not needed, the training efficiency is greatly improved. The service life of the engine can be prevented from being lost, the safety risk is reduced, and the training efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation piston engines, in particular to an aviation piston engine oil needle adjustment simulation training device. Background Art

[0002] Aviation piston engines are widely used as power devices in fixed-wing and rotary-wing drones. Before ground testing or takeoff, the UAV needs to manually adjust the oil needle position to change the engine output power so that the engine can provide the best power when the UAV is flying in the air. Therefore, the correctness of the oil needle position adjustment will directly affect the flight status of the UAV.

[0003] In actual operation, the operator needs to judge the output state of the engine based on the sound produced when the engine is working, repeatedly adjust the oil needle to find the lean point and the rich point, and then adjust the oil needle to be in the middle of the two, so as to achieve the best output power of the engine. However, in the prior art, when adjusting the oil needle, the engine sound does not change significantly when the oil needle rotates at a small angle, and the airflow generated by the high-speed rotation of the propeller is affected. It is difficult to accurately determine whether the oil needle is in the optimal power output position. Usually, the operator needs to have rich operating experience and skilled operating skills, which makes it difficult to adjust the oil needle of the aviation piston engine. It requires long-term repeated practice and a long skill generation cycle. At the same time, if the oil needle adjustment training is directly performed on the engine, it will also have a greater impact on the life of the engine, and the safety risk is high and the training efficiency is low. Utility Model Content

[0004] The utility model provides a semi-physical virtual simulation device capable of simulating the touch and hearing of oil needle adjustment of an aviation piston engine, which can solve at least one of the above technical problems.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: an aviation piston engine oil needle adjustment simulation training device, including an industrial control chassis, an oil needle assembly and an angle sensor;

[0006] The industrial control chassis is a clamshell box structure, including a box cover and a box body that are hingedly connected. There are two angle sensors, which are installed in the box body at intervals, and each of the angle sensors is hinged with a sensor shaft. The oil needle assembly can be detachably installed on the box body, including a main oil needle, an idle oil needle and a fixing part. The fixing part is installed on the side end of the box body. The main oil needle and the idle oil needle are arranged on the fixing part at intervals, and can respectively pass through the box body to be coaxially connected to the sensor shaft of each angle sensor, and drive the sensor shaft to rotate synchronously.

[0007] Furthermore, the main oil needle is used to simulate and adjust the oil output of the aviation piston engine when it is working, and the idle oil needle is used to simulate and adjust the oil output of the aviation piston engine when it is idling. Both include a needle head, a needle body and a needle tip that are connected in sequence into one body.

[0008] Furthermore, a rotation-assisting wrench is installed on the needle head, a damping spring is externally sleeved on the upper section of the needle body, external threads are distributed on the lower section, and the needle tip is coaxially connected to the sensor shaft via an externally sleeved coupling.

[0009] Furthermore, the fixing member is fitted to the side end of the box body via ear pieces respectively fixed on both sides of the bottom, and two mounting holes are provided on the fixing member at intervals, each of the mounting holes is connected to each of the reserved holes provided on the side end of the box body in a one-to-one correspondence, and the inner wall of the mounting hole is provided with internal threads;

[0010] The needle tip passes through the mounting hole and extends into the interior of the box, the needle body is arranged inside the fixing member and matches with the internal thread through the external thread, and the needle head extends out of the box.

[0011] Furthermore, it also includes a mounting bracket, which includes a base and a mounting plate, the base is fixed inside the box, the mounting plates have two, which are vertically spaced and fixed on the base, the angle sensor is fixed to the mounting plates, the sensor shaft extends from between the two mounting plates, and is coaxially connected to the main oil needle / idle oil needle.

[0012] Furthermore, the angle sensor is an optical, electromagnetic induction, coil induction, potentiometer or photoelectric coupling sensor, which is used to measure the angle of rotation of the sensor shaft driven by the main fuel needle / idle fuel needle, and convert the measured rotation angle analog signal into a rotation angle electrical signal.

[0013] Furthermore, a signal processing board, industrial computer hardware equipment and a power supply are installed inside the box;

[0014] The signal processing board includes a microprocessor and a signal adjustment circuit. The microprocessor is a single chip microcomputer, DSP, ARM or PLD type processor, which is wirelessly connected to the angle sensor and used to convert the rotation angle electrical signal transmitted by the angle sensor into oil needle position coding information. The signal adjustment circuit is electrically connected to the microprocessor and used to convert the oil needle position coding information into an electrical signal that can be processed by a computer.

[0015] The industrial computer hardware device is used to load simulation software, which includes an engine speed sound database, a UAV three-dimensional model and an engine three-dimensional model. The engine speed sound database stores the speed, sound and frequency of the main fuel needle / idle fuel needle at different positions obtained after being collected, processed and analyzed by a sound tester. The UAV three-dimensional model and the engine three-dimensional model are both proportional physical three-dimensional models, which are used to simulate the internal structure and working process of an aviation piston engine, and automatically adjust the working state according to the rotation position data of the main fuel needle / idle fuel needle;

[0016] The power supply is composed of a lithium battery pack and a DC / DC conversion module, and is used to supply power to the electrical devices in the device.

[0017] Furthermore, a box cover inner panel is provided on an inner side of the box cover, and a display screen is embedded in the box cover inner panel.

[0018] Furthermore, an inner panel is provided on an inward side of the box body, and a keyboard is embedded in the inner panel of the box body.

[0019] The beneficial effects of the utility model are embodied in:

[0020] 1. In the utility model, a semi-physical virtual simulation training device is designed by using an oil needle assembly, an angle sensor, a signal processing device and an industrial control chassis to simulate the touch and hearing of an aviation piston engine oil needle adjustment. The main oil needle and the idle oil needle are used to simulate the oil output of the aviation piston engine when it is working and the oil output at idle speed in the actual adjustment operation, respectively, to improve the authenticity of the simulation training and the fidelity of the adjustment operation. The angle sensor is used to monitor and measure the angle change signal of the oil needle rotation, and the signal processing device is used to process the angle change signal and compare it with the corresponding oil needle position sound data in the actual engine speed sound database. Through sound comparison and auditory distinction, the simulation training of the oil needle adjustment is completed.

[0021] 2. In the present invention, the oil needle adjustment simulation training device is used to allow operators / trainees to practice repeatedly for a long time, ensuring that the operators / trainees can achieve relatively proficient operating skills and have relatively rich operating experience, and can skillfully and accurately complete the oil needle adjustment when facing a real aviation piston engine.

[0022] 3. In the utility model, by utilizing the oil needle adjustment simulation training device, there is no need to train on a real aviation piston engine, thus avoiding loss of engine life, reducing safety risks, and improving training efficiency.

[0023] 4. In the present invention, all devices are integrated and installed in the industrial control chassis. The overall structure of the device is simple, easy to carry and operate, and flexible and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a perspective view of the overall structure of an embodiment of the utility model.

[0025] Figure 2 It is a schematic diagram of the inner panel of the box cover of the embodiment of the utility model.

[0026] Figure 3 It is a schematic diagram of a panel inside a box according to an embodiment of the present utility model.

[0027] Figure 4 It is a schematic diagram of the internal structure of the box body of the utility model embodiment.

[0028] Figure 5 Schematic diagram of the main oil needle of the embodiment of the utility model.

[0029] Figure 6 It is a schematic diagram of an idle oil needle in an embodiment of the utility model.

[0030] Figure 7 It is a perspective view of a fixing member of an embodiment of the utility model.

[0031] Figure 8 It is a top view of the fixing member of the embodiment of the utility model.

[0032] Fig. 9 It is a perspective view of the assembly of the oil needle assembly and the angle sensor of an embodiment of the utility model.

[0033] Fig.10 It is a schematic diagram of a mounting bracket according to an embodiment of the utility model.

[0034] The components in the accompanying drawings are marked as follows: 1. industrial control chassis; 2. box cover; 201. box cover inner panel; 3. box body; 301. box inner panel; 4. display; 5. keyboard; 6. oil needle assembly; 7. main oil needle; 8. idle oil needle; 9. needle; 901. turning wrench; 10. needle body; 1001. damping spring; 1002. external thread; 11. needle tip; 12. fixing piece; 1201. mounting hole; 1202. internal thread; 1203. ear piece; 13. angle sensor; 1301. sensor shaft; 14. coupling; 15. mounting bracket; 1501. base; 1502. mounting piece. DETAILED DESCRIPTION

[0035] 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, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that satisfy both A and B.

[0036] See also Figure 1 and 9 , the embodiment of the utility model provides an aviation piston engine oil needle adjustment simulation training device, including an industrial control chassis 1, an oil needle assembly 6 and an angle sensor 13;

[0037] The industrial control chassis 1 is a clamshell box structure, including a box cover 2 and a box body 3 that are hingedly connected. There are two angle sensors 13, which are installed at intervals in the box body 3, and each of the angle sensors 13 is hinged with a sensor shaft 1301. The oil needle assembly 6 can be detachably installed on the box body 3, including a main oil needle 7, an idle oil needle 8 and a fixing part 12. The fixing part 12 is installed on the side end of the box body 3. The main oil needle 7 and the idle oil needle 8 are spaced apart and penetrated on the fixing part 12, and can respectively pass through the box body 3 to be coaxially connected to the sensor shaft 1301 of each of the angle sensors 13, and drive the sensor shaft 1301 to rotate synchronously.

[0038] In the utility model, a semi-physical virtual simulation training device capable of simulating the touch and hearing sense of the oil needle of an aviation piston engine when adjusting the oil needle is designed by using an oil needle assembly, an angle sensor, a signal processing device and an industrial control chassis. The main oil needle and the idle oil needle are used to respectively simulate the oil output of the aviation piston engine when working and the oil output at idle speed in the actual adjustment operation, so as to improve the authenticity of the simulation training and the fidelity of the adjustment operation. The angle sensor is used to monitor and measure the angle change signal of the oil needle rotation, and the signal processing device is used to process the angle change signal, and the signal is compared with the corresponding oil needle position sound data in the actual engine speed sound database. Through the comparison of sound and the distinction of hearing, the simulation training of the oil needle adjustment is completed.

[0039] The oil needle adjustment simulation training device can be used by operators / trainees to conduct long-term repeated practice, ensuring that the operators / trainees can achieve relatively proficient operating skills and have relatively rich operating experience, and can skillfully and accurately complete the oil needle adjustment when facing a real aviation piston engine. At the same time, since there is no need to train on a real aviation piston engine, the loss of engine life can be avoided, the safety risk is reduced, and the training efficiency is improved.

[0040] See also Figure 4-6 In this embodiment, the main oil needle 7 is used to simulate and adjust the oil output of the aviation piston engine when it is working, and the idle oil needle 8 is used to simulate and adjust the oil output of the aviation piston engine when it is idling. Both of them include a needle head 9, a needle body 10 and a needle tip 11 connected in sequence as one body. This design is because in actual operation, the aviation piston engine needs to use the above two oil needles to adjust the working state of the engine. Therefore, in this application, in order to ensure the authenticity of the simulation training, the main oil needle 7 and the idle oil needle 8 are also set. The two oil needles are different in structural composition. The needle head 9, the needle body 10 and the needle tip 11 are all formed from top to bottom, and there are some differences in size.

[0041] See also Figure 4-6 In this embodiment, a rotation-assisting wrench 901 is installed on the needle head 9, a damping spring 1001 is externally mounted on the upper section of the needle body 10, and an external thread 1002 is distributed on the lower section. The needle tip 11 is coaxially connected to the sensor shaft 1301 via an externally mounted coupling 14. In this design, the diameter of the needle 9 is larger than the diameter of the needle body 10. The auxiliary wrench 901 is used to assist in rotating the oil needle and can be coaxially arranged with the needle 9. During the installation, rotation and adjustment of the main oil needle 7 / idle oil needle 8, the external thread 1002 on the needle body 10 is threadedly inserted and connected with the fixing member 12. The damping spring 1001 plays a role of elastic protection, which not only prevents the entire oil needle from directly penetrating into the housing 3 and causing damage to the angle sensor 13, but also increases elastic buffering during the rotation and adjustment of the oil needle, thereby making the adjustment force softer and the adjustment angle more precise. The needle 9 and the sensor shaft 1301 inserted into the housing 3 are coaxially fixed through the coupling 14. When the oil needle rotates, it will drive the sensor shaft 1301 to rotate synchronously.

[0042] See also Figure 7-9In this embodiment, the fixing member 12 is fitted to the side end of the box body 3 via the ear pieces 1203 respectively fixed on both sides of the bottom, and two mounting holes 1201 are provided on the fixing member 12 at intervals, and each of the mounting holes 1201 is connected to each of the reserved holes provided on the side end of the box body 3 in a one-to-one correspondence, and the inner wall of the mounting hole 1201 is provided with an internal thread 1202;

[0043] The needle tip 11 passes through the mounting hole 1201 and extends into the interior of the box 3 . The needle body 10 is inserted into the interior of the fixing member 12 and is threadably matched with the internal thread 1202 via the external thread 1002 . The needle head 9 extends out of the box 3 .

[0044] In this design, the fixing part 12 is installed and fixed via the ear piece 1203, the mounting hole 1201 is aligned with the reserved hole on the housing 3, the main oil needle 7 / idle oil needle 8 passes through the mounting hole 1201 and the reserved hole, and is installed in an interlaced manner with the fixing part 12, thereby realizing an installation on the housing 3 with an adjustable rotation angle.

[0045] See also Figure 9-10 In this embodiment, a mounting bracket 15 is also included. The mounting bracket 15 includes a base 1501 and a mounting sheet 1502. The base 1501 is fixed inside the housing 3. The mounting sheet 1502 has two vertically spaced fixed pieces on the base 1501. The angle sensor 13 is fixed to the mounting sheet 1502. The sensor shaft 1301 extends from between the two mounting sheets 1502 and is coaxially connected to the main oil needle 7 / idle oil needle 8. With this design, the angle sensor 13 is detachably installed in the housing 3 via the mounting bracket 15. During operation, the angle sensor 13 is fixed relative to the mounting bracket 15, and the sensor shaft 1301 is rotatably adjustable relative to the mounting bracket 15.

[0046] See also Fig. 9 In this embodiment, the angle sensor 13 is an optical, electromagnetic induction, coil induction, potentiometer or photoelectric coupling sensor, which is used to measure the angle of rotation of the sensor shaft 1301 driven by the main fuel needle 7 / idle fuel needle 8, and convert the measured rotation angle analog signal into a rotation angle electrical signal. With this design, the rotation angle electrical signal measured by the angle sensor 13 is the angle change amount that occurs during the actual rotation of the main fuel needle 7 / idle fuel needle 8;

[0047] It should be noted that the angle sensor 13 in the present application is a standard part or a modified part that can be purchased in the prior art. The specific model is not limited here, and it only needs to monitor and measure the rotation angle.

[0048] See also Figure 1 and 4 In this embodiment, a signal processing board, an industrial computer hardware device and a power supply are installed inside the box 3;

[0049] The signal processing board includes a microprocessor and a signal adjustment circuit. The microprocessor is a single chip microcomputer, DSP, ARM or PLD type processor, which is wirelessly connected to the angle sensor 13 and used to convert the rotation angle electrical signal transmitted by the angle sensor 13 into oil needle position coding information. The signal adjustment circuit is electrically connected to the microprocessor and used to convert the oil needle position coding information into an electrical signal that can be processed by a computer.

[0050] The industrial computer hardware device is used to load simulation software, which includes an engine speed sound database, a UAV three-dimensional model and an engine three-dimensional model. The engine speed sound database stores the speed, sound and frequency of the main oil needle 7 / idle oil needle 8 at different positions obtained after being collected, processed and analyzed by a sound tester. The UAV three-dimensional model and the engine three-dimensional model are both proportional physical three-dimensional models, which are used to simulate the internal structure and working process of an aviation piston engine, and automatically adjust the working state according to the rotation position data of the main oil needle 7 / idle oil needle 8;

[0051] The power supply is composed of a lithium battery pack and a DC / DC conversion module, and is used to supply power to the electrical devices in the device.

[0052] In this way, the simulation software is used to compare and call the oil needle position coding signal sent by the signal processing board with the corresponding oil needle position sound data in the engine speed sound database, and while rotating the main oil needle 7 / idle oil needle 8, the oil needle position of the UAV three-dimensional model and the engine three-dimensional model is synchronously changed, and the engine speed sound corresponding to its position is output, and the simulation training of the oil needle adjustment is completed through sound comparison and auditory discrimination;

[0053] It should be noted that the signal processing board, the industrial computer hardware equipment and the power supply in the present application are all standard parts or modified parts that can be purchased in the prior art. The specific models are not limited here, and they only need to realize their respective functions.

[0054] See also Figure 2In this embodiment, the inner side of the box cover 2 is provided with a box cover inner panel 201, and a display screen 4 is embedded in the box cover inner panel 201. With this design, the display screen 4 is electrically connected to the angle sensor 12, the signal processing board, the industrial computer hardware device and the power supply, and is used to display the measurement signal, processing data, training results, etc. in real time. Similarly, the existing technology can be used, and the specific model is not particularly limited here.

[0055] See also Figure 3 In this embodiment, the inner side of the box body 3 is provided with a box inner panel 301, and the box inner panel 301 is embedded with a keyboard 5. With this design, the keyboard 5 is electrically connected to the angle sensor 12, the signal processing board, the industrial computer hardware device and the power supply, and is used to operate the entire training process. Similarly, the existing technology can be used, and the specific model is not particularly limited here.

[0056] In summary, in the utility model, a semi-physical virtual simulation training device capable of simulating the touch and hearing of the oil needle adjustment of an aviation piston engine is designed by using an oil needle assembly, an angle sensor, a signal processing device and an industrial control chassis. The main oil needle and the idle oil needle are used to respectively simulate the oil output of the aviation piston engine when it is working and the oil output at idle speed in the actual adjustment operation, so as to improve the authenticity of the simulation training and the fidelity of the adjustment operation. The angle sensor is used to monitor and measure the angle change signal of the oil needle rotation, and the signal processing device is used to process the angle change signal and compare it with the corresponding oil needle position sound data in the actual engine speed sound database. Through the comparison of sound and the distinction of hearing, the simulation training of the oil needle adjustment is completed.

[0057] The oil needle adjustment simulation training device can be used for operators / trainees to practice repeatedly for a long time, ensuring that the operators / trainees can achieve relatively proficient operating skills and have relatively rich operating experience, and can skillfully and accurately complete the oil needle adjustment when facing a real aviation piston engine. At the same time, since there is no need to train on a real aviation piston engine, the loss of engine life can be avoided, the safety risk is reduced, and the training efficiency is improved;

[0058] All equipment is integrated and installed in the industrial control chassis. The overall structure of the device is simple, easy to carry and operate, flexible and simple.

[0059] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A simulation training device for adjusting the oil needle of an aviation piston engine, characterized in that: It comprises an industrial control chassis (1), an oil needle assembly (6) and an angle sensor (13); The industrial control case (1) is a flip-top case structure, comprising a case cover (2) and a case (3) which are hingedly connected. The angle sensors (13) are provided with two of them, which are installed in the case (3) at intervals, and each of the angle sensors (13) is hingedly connected with a sensor shaft (1301). The oil needle assembly (6) is detachably installed on the case (3), comprising a main oil needle (7), an idle oil needle (8) and a fixing member (12). The fixing member (12) is installed on the side end of the case (3). The main oil needle (7) and the idle oil needle (8) are arranged on the fixing member (12) at intervals, and can respectively pass through the case (3) to be coaxially connected with the sensor shaft (1301) of each of the angle sensors (13), and drive the sensor shaft (1301) to rotate synchronously.

2. The aviation piston engine oil needle adjustment simulation training device according to claim 1, characterized in that: The main oil needle (7) is used to simulate and adjust the oil output of the aviation piston engine when it is working, and the idle oil needle (8) is used to simulate and adjust the oil output of the aviation piston engine when it is idling. Both of them include a needle head (9), a needle body (10) and a needle tip (11) which are connected in sequence into one body.

3. The aviation piston engine oil needle adjustment simulation training device according to claim 2, characterized in that: The needle head (9) is provided with a rotation-assisting wrench (901), the upper section of the needle body (10) is externally sleeved with a damping spring (1001), and the lower section is provided with external threads (1002), and the needle tip (11) is coaxially connected to the sensor shaft (1301) via an externally sleeved coupling (14).

4. The aviation piston engine oil needle adjustment simulation training device according to claim 3, characterized in that: The fixing member (12) is fitted to the side end of the box body (3) via ear pieces (1203) respectively fixed on both sides of the bottom, and two mounting holes (1201) are arranged on the fixing member (12) at intervals, and each of the mounting holes (1201) is connected to each of the reserved holes arranged on the side end of the box body (3) in a one-to-one correspondence, and the inner wall of the mounting hole (1201) is provided with an internal thread (1202); The needle tip (11) passes through the mounting hole (1201) and extends into the interior of the box (3); the needle body (10) is inserted into the interior of the fixing member (12) and is threadably matched with the internal thread (1202) via the external thread (1002); and the needle head (9) extends out of the exterior of the box (3).

5. The aviation piston engine oil needle adjustment simulation training device according to claim 1, characterized in that: It also includes a mounting bracket (15), the mounting bracket (15) including a base (1501) and a mounting plate (1502), the base (1501) is fixed inside the box body (3), the mounting plate (1502) has two plates, which are fixed on the base (1501) at a vertical interval, the angle sensor (13) is fixed to the mounting plate (1502), the sensor shaft (1301) extends from between the two mounting plates (1502), and is coaxially connected to the main oil needle (7) / idle oil needle (8).

6. The aviation piston engine oil needle adjustment simulation training device according to claim 1, characterized in that: The angle sensor (13) is an optical, electromagnetic induction, coil induction, potentiometer or photoelectric coupling sensor, and is used to measure the angle of rotation of the sensor shaft (1301) driven by the main oil needle (7) / idle oil needle (8), and convert the measured rotation angle analog signal into a rotation angle electrical signal.

7. The aviation piston engine oil needle adjustment simulation training device according to claim 1, characterized in that: The box (3) is internally installed with a signal processing board, industrial computer hardware equipment and a power supply; The signal processing board comprises a microprocessor and a signal adjustment circuit. The microprocessor is a single chip microcomputer, DSP, ARM or PLD type processor, and is wirelessly connected to the angle sensor (13) for converting the rotation angle electrical signal transmitted by the angle sensor (13) into oil needle position coding information. The signal adjustment circuit is electrically connected to the microprocessor for converting the oil needle position coding information into an electrical signal that can be processed by a computer. The power supply is composed of a lithium battery pack and a DC / DC conversion module, and is used to supply power to the electrical devices in the device.

8. The aviation piston engine oil needle adjustment simulation training device according to claim 1, characterized in that: A box cover inner panel (201) is provided on the inner side of the box cover (2), and a display screen (4) is embedded in the box cover inner panel (201).

9. The aviation piston engine oil needle adjustment simulation training device according to claim 1, characterized in that: An inner panel (301) is provided on an inwardly facing side of the box body (3), and a keyboard (5) is embedded in the inner panel (301).

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