A portable water flow velocity measuring instrument

Abstract

The present invention provides a portable water flow velocity measuring instrument, which includes a frame base, a handheld component, a controller, a speed detection module, a power slider component and a driving mechanism. There are guiding slideways in the middle of the inner walls around the tunnel tube of the frame base. A transfer sleeve is fixed at the center of the top of the tunnel tube and is sleeved with the vertical pipe of the handheld component. The power slider component includes a slider and a cross block fixed together. At the end of each support arm of the cross block, a follower wheel is installed through a pin shaft, and each follower wheel is respectively installed in a corresponding guiding slideway in a matching manner; the driving mechanism is used to drive the slider to move, and the speed detection module is used to monitor the moving speed of the slider. By comparing the moving speed of the slider in the flowing water and / or against the water with the moving speed in the no-resistance mode, the water flow velocity is determined. The present invention simplifies the operation process, improves the measurement accuracy, and has the advantages of portability and operation, so as to better meet the requirements of water conservancy engineers for water flow velocity in actual work.

Description

Technical Field

[0001] The present invention belongs to the technical field of portable devices for water flow velocity, and particularly relates to a portable water flow velocity measuring instrument. Background Art

[0002] At present, portable water flow velocity measuring instruments are commonly used tools for measuring the flow velocity of water bodies. These instruments are characterized by being light, easy to carry and operate, and are suitable for outdoor field work and temporary measurement requirements. However, there are currently some technical problems and challenges that affect the performance and application scope of portable water flow velocity measuring instruments.

[0003] Accuracy and precision: Portable water flow velocity measuring instruments may have problems in terms of accuracy and precision in some cases. The measurement process may be interfered by environmental factors, such as water flow turbulence and the presence of impurities in the water. These factors may cause deviations or inaccuracies in the measurement results, affecting the reliability and precision of the measurement; Applicability and universality: The shapes, sizes and characteristics of different water areas vary, which poses requirements for the applicability of portable water flow velocity measuring instruments. Current instruments may perform well under specific water area conditions, but may not work well in other irregularly shaped water areas. To improve universality, it is necessary to design more flexible and adaptable measuring instruments that can adapt to various water area forms and environmental conditions; Ease of operation: The operation and setting process of portable water flow velocity measuring instruments may be relatively complex, requiring users to have certain professional knowledge and skills. This may be difficult for non-professional personnel, limiting the wide application of the measuring instrument. Simplifying the operation process and providing a user-friendly interface design are the keys to solving this problem.

[0004] Existing portable water flow velocity measuring instruments provide flexibility and convenience in measuring water flow velocity, but still face some technical problems and challenges. Summary of the Invention

[0005] Aiming at the defects and problems commonly existing in existing similar products, the present invention provides a precise, convenient measuring tool applicable to various water areas, solves the restrictive factors existing in the prior art, and realizes the portability and intelligence of high-precision water flow velocity measurement.

[0006] The solution of the present invention to solve its technical problems is as follows: A portable water flow velocity measuring instrument is adopted, which includes a frame base and a handheld component, as well as a controller and a speed detection module. It also includes a power slider component and a driving mechanism. The frame base includes a tunnel tube. There are guiding slides in the middle of the inner walls around the tunnel tube respectively. There are symmetrical tracks on both sides of the bottom guiding slide. A vertical adapter sleeve is fixed at the center of the top of the tunnel tube. The adapter sleeve and the vertical pipe of the handheld component are sleeved together and can rotate. The power slider component includes a slider and a cross block fixed together. The slider is assembled in the track. The cross block includes four support arms. A follower wheel is installed at the end of each support arm through a pin shaft. Each follower wheel is respectively installed in the corresponding guiding slide. The driving mechanism is used to drive the slider to move. The speed detection module is used to monitor the moving speed of the slider. By comparing the moving speed of the slider in the downstream and / or upstream water with the moving speed in the resistance-free mode, the water flow speed is determined.

[0007] Preferably, a mesh layer is fixed on the front side of the cross block. A series of diversion holes are distributed on the mesh layer. The mesh layer can provide pressure from the water flow to the cross block and the slider, and act the water flow pressure on the slider.

[0008] Preferably, the driving mechanism includes a motor, a worm, a worm gear, a rotating shaft and a track wheel. A function cavity is arranged inside the slider. A motor is vertically fixed at the top of the function cavity. The rotating shaft of the motor extends into the function cavity and is fixed with a worm. A track wheel is installed at the bottom of the slider through a rotating shaft. At the same time, a worm gear is sleeved on the rotating shaft. The worm meshes with the worm gear. The track wheel is sleeved in the corresponding track.

[0009] Preferably, a guiding mechanism is added, which includes a diversion cover and a direction wing. The diversion cover is fixedly or rotatably installed at the bottom of the tunnel tube. A vertical direction wing is fixed at the center of the end of the diversion cover. Under the action of the water flow, the direction wing is always located in the front side of the water flow direction, so as to determine the direction of the frame base by using the guiding mechanism.

[0010] Preferably, the handheld component includes a pipe section, a handle, a handheld machine and a main chassis. Among them, multiple pipe sections are connected by threads at the ends to form a combined vertical pipe. A handle is fixedly installed at the upper end of the vertical pipe. A wire hole is arranged at the upper part of the front end of the handle. The inner cavity of the vertical pipe and the wire hole are respectively used to assemble data lines and power lines. Each data line and power line are aggregated into a cable and connected to the interface of the main chassis. A controller is arranged in the main chassis. The control end and the display output end of the controller are connected to the handheld machine. The handheld machine is provided with corresponding control buttons and a display screen.

[0011] Preferably, a clutch control mechanism is provided, which includes a spline shaft section, a spline shaft sleeve, a moving disk, an in-situ disk, a spring, and a separating electromagnet. A spline shaft section is provided on a section of the rotating shaft, and a spline shaft sleeve is fitted outside the spline shaft section. A moving disk is fixed to the inner end of the spline shaft sleeve. An in-situ disk is fixed to the side wall of the worm gear. A spring is connected to the outside of the moving disk, and a separating electromagnet is fixed to the bracket on the outside of the moving disk.

[0012] Advantages of the present invention: The present invention provides a more flexible portable water flow velocity measuring instrument suitable for irregular waters. It simplifies the operation process, improves the measurement accuracy, and has the advantages of portability and easy operation, thus better meeting the requirements of water conservancy engineers for water flow velocity in actual work. In addition, by introducing a clutch control mechanism, the measurement accuracy and real-time monitoring ability are improved, and it also has the advantages of portability, non-contact measurement, and automatic control, effectively solving the problems existing in the prior art and enhancing the effect and application value of water flow velocity measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the water flow velocity measuring instrument of the present invention;

[0014] Figure 2 is Figure 1 an enlarged structural diagram of the middle frame seat in

[0015] Figure 3 is Figure 2 the bottom structural diagram of

[0016] Figure 4 is Figure 2 the left view of

[0017] Figure 5 is Figure 4 an enlarged structural diagram of part A in

[0018] Figure 6 is Figure 4 the sectional structural diagram of B-B in

[0019] Reference numerals in the figure: frame base 1, power slider assembly 2, drive mechanism 3, clutch control mechanism 4, guiding mechanism 5, rotation control mechanism 6, handheld assembly 7, frame base 1, tunnel pipe 11, guiding slideway 12, track 13, adapter sleeve 14, power slider assembly 2, slider 21, cross block 22, follower wheel 23, mesh layer 24, diversion hole 25, drive mechanism 3, functional cavity 31, motor 32, worm 33, worm gear 34, rotating shaft 35, track wheel 36, locking nut 37, clutch control mechanism 4, spline shaft section 41, spline bushing 42, moving disk 43, in-situ disk 44, spring 45, separating electromagnet 46, guiding mechanism 5, diversion cover 51, direction wing 52, rotation control mechanism 6, fixed ring 61, rotating ring 62, permanent magnet bar 63, direction-adjusting electromagnet 64, handheld assembly 7, pipe section 71, handle 72, wire hole 73, handheld machine 74, main chassis 75. Embodiment

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Embodiment 1: A portable water flow velocity measuring instrument as Figure 1 shown, which is mainly improved in view of the problems and deficiencies existing in the existing laser Doppler velocimeter during flow rate detection. Although the existing laser Doppler velocimeter is non-contact, it needs to be used for regular water areas with specific widths and depths, and the laser sensor needs to be aligned with the water flow direction. Even when measuring the flow velocity in an artificial water channel, parameters such as the width and depth of the water channel need to be input into the handheld machine. For irregularly shaped water areas, the accuracy of this velocimeter is significantly deteriorated. The water flow velocity measuring instrument provided in this embodiment is not restricted by the above factors, and mainly includes a frame base 1, a power slider assembly 2, a drive mechanism 3, a guiding mechanism 5, a rotation control mechanism 6, a handheld assembly 7, etc.

[0022] Specifically, as Figure 2 shown, the frame base 1 includes a tunnel pipe 11, a guiding slideway 12, a track 13 and an adapter sleeve 14. Among them, the tunnel pipe 11 is a horizontally placed rectangular pipe, which has side walls on all four sides but penetrates through from front to back. Guiding slideways 12 are respectively provided in the middle of the inner walls on all four sides. Symmetrical tracks 13 are respectively provided on both sides of the guiding slideway 12 at the bottom. A vertical adapter sleeve 14 is fixed at the center of the top of the tunnel pipe 11, and the adapter sleeve 14 can rotate when sleeved with the vertical pipe of the handheld assembly 7.

[0023] As Figure 4 and Figure 6 shown, the power slider assembly 2 includes a slider 21, a cross block 22, a follower wheel 23, a mesh layer 24 and a diversion hole 25. Among them, a cross block 22 is fixed on the front side of the slider 21. The cross block 22 includes four support arms, and a follower wheel 23 is installed at the end of each support arm through a pin shaft. Each follower wheel 23 is respectively and matchingly installed in the corresponding guiding slideway 12.

[0024] Further, a mesh layer 24 is fixed to the front side of the cross block 22. A series of diversion holes 25 are distributed on the mesh layer 24. The mesh layer 24 can provide pressure from the water flow to the cross block 22 and the slider 21, and act the water flow pressure on the slider 21.

[0025] As Figure 4 and Figure 5 shown, the driving mechanism 3 includes a functional cavity 31, a motor 32, a worm 33, a worm gear 34, a rotating shaft 35, a track wheel 36 and a locking nut 37, as well as a speed detection module. A functional cavity 31 is arranged inside the slider 21. A motor 32 is vertically fixed to the top of the functional cavity 31. The rotating shaft of the motor extends into the functional cavity 31 and is fixed with a worm 33. A track wheel 36 is installed at the bottom of the slider 21 through the rotating shaft 35. At the same time, a worm gear 34 is sleeved on the rotating shaft 35, and the worm 33 meshes with the worm gear 34. The track wheel 36 is fitted into the detailed track 13. The end of the rotating shaft 35 fixes each track wheel and the rotating shaft together through the locking nut 37. The speed detection module is used to accurately detect the moving speed of the slider.

[0026] According to the debugging of the power supply and running speed of the slider before leaving the factory, when the slider is subject to water flow resistance, its moving speed becomes slower. According to the degree of the slowdown or acceleration of the slider's moving speed (the slider is controlled to have two speeds of countercurrent and downstream, with speed changes relative to the initial situation without water pressure), the water flow resistance is calculated. Since the water flow resistance is linearly proportional to the water flow speed, it can be used to monitor the water flow speed.

[0027] Further, a guiding mechanism 5 is added. As Figure 3 and Figure 6 shown, the guiding mechanism includes a diversion cover 51 and a direction wing 52. Among them, the diversion cover 51 is a tubular structure, and the tube cavity is the diversion channel. The diversion cover 51 is fixedly or rotatably installed at the bottom of the tunnel tube 11. A vertical direction wing 52 is fixed at the center of the end of the diversion cover 51. Under the action of the water flow, the direction wing 52 is always located in the front side of the water flow direction, so as to determine the direction of the frame base 1 by using the guiding mechanism.

[0028] When the diversion cover 51 is rotatably installed at the bottom of the tunnel tube 11, it is adopted as Figure 6The rotation control mechanism 6 shown includes a fixed ring 61, a rotating ring 62, a permanent magnet strip 63, and an alignment electromagnet 64. Among them, the fixed ring 61 is fixed at the central position of the bottom of the tunnel pipe 11, the rotating ring 62 is fixed at the central position of the top of the guide cover 51, the fixed ring 61 and the rotating ring 62 are matched and sleeved and hooked together, and a wear-resistant ring sleeve is installed at the sleeved part to facilitate rotation. At the same time, a permanent magnet strip 63 is fixed in the inner cavity of the rotating ring, and alignment electromagnets 64 are respectively fixed at the front and rear ends of the inner cavity of the fixed ring. The coil directions of the two ends of the alignment electromagnets 64 are opposite. When direct current is connected to the two ends of the alignment electromagnets 64 at the same time, the two ends of the alignment electromagnets 64 respectively attract the magnetic poles at both ends of the permanent magnet strip 63. When the direct current is reversed, the two ends of the alignment electromagnets 64 respectively repel the magnetic poles at both ends of the permanent magnet strip 63. After the repulsion, when the diversion cover 51 rotates 180 degrees, at this time, the two ends of the alignment electromagnets 64 start to attract the realigned permanent magnet strip 63. By controlling the power supply and commutation control of the two ends of the alignment electromagnets 64 through the controller, the direction of the guiding mechanism 5 is controlled. Since the upper part of the tunnel pipe 11 is installed with the vertical pipe through the adapter sleeve 14 and can rotate, when the guiding mechanism 5 rotates, under the impact of the water flow, the frame base 1 can also rotate 180 degrees to achieve commutation. After adding the guiding mechanism 5, the water flow data can be verified bidirectionally according to the upstream and downstream movement of the slider. The average value taken by the positive and negative bidirectional verification is mainly used to eliminate the measurement error caused by mechanical resistance factors.

[0029] As Figure 1 shown, the handheld component 7 includes a pipe section 71, a handle 72, a wire hole 73, a handheld device 74, and a main chassis 75. Among them, multiple pipe sections 71 are connected by threaded ends to form a combined vertical pipe. The upper end of the vertical pipe is fixedly installed with a handle 72. A wire hole 73 is provided at the upper part of the front end of the handle. The inner cavity of the vertical pipe and the wire hole are respectively used for assembling data lines and power lines. Each data line and power line are aggregated into a cable and connected to the interface of the main chassis 75. A controller is arranged in the main chassis 75. The control end and the display output end of the controller are connected with a handheld device 74. The handheld device is provided with corresponding control buttons and a display screen for notifying the detection time, switching directions to verify data, observing and recording data information, etc. It has a compact and lightweight design, is easy to carry and operate, and is suitable for outdoor field work and temporary measurement requirements.

[0030] Among them, the display and recording function: equipped with a liquid crystal display screen, it can display the measurement results in real time and supports the data recording and storage function, which is convenient for subsequent analysis and report generation; data transmission and processing: the data can be transmitted to a computer or a mobile device through Bluetooth, USB, etc. for further processing and analysis; multi-parameter measurement: in addition to the water flow velocity, some advanced instruments also have the multi-parameter measurement ability, such as adding sensors for measuring factors such as water temperature, flow rate, and depth on the side wall of the tunnel pipe, providing more comprehensive data support for comprehensive water body analysis.

[0031] The specific usage of the portable water flow meter described above may vary depending on the instrument model and the manufacturer's instructions. Before operating the instrument, be sure to read and follow the relevant instructions and safety precautions. However, the basic usage process is as follows:

[0032] 1. Preparation:

[0033] a. Make sure the instrument has sufficient power and check whether it is working properly.

[0034] b. Connect the handheld assembly 7 to the frame 1, ensuring the connection is secure.

[0035] 2. Installation:

[0036] a. Place the frame 1 at the position of the water flow to be measured and adjust the direction of the frame so that the deflector 51 faces the direction of the water flow.

[0037] b. Use the guide mechanism 5 to ensure that the direction of the frame seat 1 is correct, and the direction can be reversed by rotating the control mechanism 6 as needed.

[0038] 3. Start measurement:

[0039] a. Press the power button on the handheld unit 74 to start the instrument.

[0040] b. Set measurement parameters as needed, such as unit selection, data logging, etc.

[0041] 4. Take measurements:

[0042] a. Place the power slider assembly 2 into the tunnel tube 11, ensuring that the slider 21 is perpendicular to the water flow.

[0043] b. As the water flows, the slider 21 moves due to the water flow resistance, and the measuring instrument records the moving speed of the slider.

[0044] c. Calculate the water flow rate based on the change in the slider's movement speed and display it on the LCD screen of the handheld device 74.

[0045] 5. Data processing and recording:

[0046] a. After the measurement is completed, the instrument will display the measurement results on the LCD screen of the handheld device 74.

[0047] b. You can choose to transfer the data to a computer or mobile device via Bluetooth or USB for further processing and analysis.

[0048] c. If needed, data can be stored internally in the instrument for subsequent analysis and report generation.

[0049] 6. Cleaning and Maintenance:

[0050] a. After use, take out the slider assembly 2 and clean it thoroughly to ensure no residue remains.

[0051] b. Clean all parts of the instrument and keep them dry and dust-free.

[0052] c. Regularly check and maintain the power supply and sensors of the instrument to ensure its normal operation.

[0053] The above solution improves the problems existing in the prior art, mainly proposed in view of the limitations of the existing laser Doppler velocimeter. Specifically reflected in:

[0054] 1. Regarding the limitation of specific waters: The existing laser Doppler velocimeter needs to be used in regular waters with specific width and depth, and the laser sensor needs to be aligned with the water flow direction. However, the portable water flow velocity measuring instrument in the above solution adopts designs such as a power slider assembly and a guiding mechanism, and is no longer limited by the shape and size of specific waters. It can be applied to irregular waters, including curved water channels, water ditches, and other waters with complex shapes.

[0055] 2. Simplification of parameter input: Compared with the existing laser Doppler velocimeter that requires manual input of parameters such as water width and depth, the measuring instrument in the above solution determines the water flow velocity by measuring and calculating the moving speed of the slider in real time, without manual input of specific parameters. This simplifies the operation process, reduces the workload of users and possible input errors.

[0056] 3. Improvement in high-precision measurement: The measuring instrument in the above solution provides a higher-precision measurement of water flow velocity through the coordinated action of the driving mechanism and the guiding mechanism. Compared with the laser Doppler velocimeter, there is an obvious improvement in the measurement accuracy of this solution, and it can more accurately monitor the water flow resistance and calculate the water flow velocity.

[0057] 4. Improvement in portability and operation: The portable water flow velocity measuring instrument in the above solution has a compact and lightweight design, which is easy to carry and operate. Compared with the complex installation and use process of the laser Doppler velocimeter, this measuring instrument can be quickly deployed and operated, and is suitable for outdoor field work and temporary measurement requirements.

[0058] Example 2: Based on Example 1, as Figure 5As shown in the figure, a clutch control mechanism 4 is further provided, which includes a spline shaft segment 41, a spline shaft sleeve 42, a moving disk 43, a home position disk 44, a spring 45 and a separating electromagnet 46. That is, a spline sleeve is sleeved on a section of the rotating shaft 35 or the rotating shaft 35 is directly set as a spline to form the spline shaft segment 41. A spline shaft sleeve 42 is fitted outside the spline shaft segment 41. The inner end of the spline shaft sleeve 42 is fixed with a moving disk 43. A home position disk 44 is fixed on the side wall of the worm gear. The moving disk 43 and the home position disk 44 can be fitted or separated. A spring 45 is connected outside the moving disk 43. That is, the spring 45 is supported between a side track wheel and the moving disk 43. A separating electromagnet 46 is fixed on the bracket outside the moving disk 43. This bracket is connected to the inner wall of the functional cavity of the slider. In the natural state, under the pressure of the spring 45, the moving disk 43 and the home position disk 44 are fitted together, so that the rotational power of the motor can be transmitted to the rotational power of the rotating shaft 35, and the slider 21 can be notified to move. However, when the separating electromagnet 46 is controlled to be powered on by the controller, the moving disk 43 and the home position disk 44 are separated. At this time, the rotational power of the motor cannot be transmitted to drive the rotating shaft 35 to rotate. At this time, the slider is in a disengaged driving state, that is, a free state.

[0059] In this embodiment, by controlling and instantaneously releasing the driving of the slider, the moving state of the slider can be changed. By judging the moving state of the slider, the water flow velocity can be determined. When the slider is subjected to the water flow resistance, its moving speed slows down or stops. By monitoring the moving state of the slider, the magnitude of the water flow velocity can be inferred. Therefore, the introduction of the clutch control mechanism increases the control and detection capabilities of the moving state of the slider, and improves the accuracy and reliability of measuring the water flow velocity.

[0060] The above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principle of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention.

Claims

1. A portable water flow rate measuring instrument, comprising a frame (1) and a handheld component (7), a controller and a speed detection module, characterized in that: The invention also includes a power slider assembly (2), a driving mechanism (3) and a clutch control mechanism (4). The frame seat (1) includes a tunnel tube (11). Guide slideways (12) are respectively provided in the middle of the inner walls of the four sides of the tunnel tube (11). Symmetrical tracks (13) are respectively provided on both sides of the bottom guide slideway (12). A vertical adapter sleeve (14) is fixed at the top center of the tunnel tube (11). The adapter sleeve (14) is rotatably mounted together with the vertical tube of the handheld assembly (7). The power slider assembly (2) includes a guide slideway (12) fixed at the center of the four sides of the tunnel tube (11). The slider (21) and the cross block (22) are assembled in the track (13), and the cross block (22) includes four support arms. The end of each support arm is equipped with a follower wheel (23) through a pin shaft, and each follower wheel (23) is matched and installed in the corresponding guide slideway (12); the driving mechanism (3) is used to drive the slider to move, and the speed detection module is used to monitor the moving speed of the slider. By comparing the moving speed of the slider in the downstream and / or upstream mode with the moving speed in the resistance-free mode, the water flow speed is determined. The driving mechanism (3) includes a motor (32), a worm (33), a worm wheel (34), a rotating shaft (35) and a track wheel (36). A functional cavity (31) is provided inside the slider (21). The motor (32) is vertically fixed on the top of the functional cavity (31). The rotating shaft of the motor extends into the functional cavity (31) and is then fixed with the worm (33). The track wheel (36) is installed at the bottom of the slider (21) through the rotating shaft (35). The worm wheel (34) is mounted on the rotating shaft (35). The worm (33) is meshed with the worm wheel (34). The track wheel (36) is matched and mounted in the track (13). The clutch control mechanism (4) comprises a spline shaft section (41), a spline shaft sleeve (42), a movable disk (43), an original disk (44), a spring (45) and a separation electromagnet (46). The spline shaft section (41) is provided on a section of the rotating shaft (35). The spline shaft sleeve (42) is matched with the outer side of the spline shaft section (41). The movable disk (43) is fixed to the inner end of the spline shaft sleeve (42). The original disk (44) is fixed to the side wall of the worm gear. The spring (45) is connected to the outer side of the movable disk (43). The separation electromagnet (46) is fixed to the bracket on the outer side of the movable disk (43).

2. The portable water flow rate measuring instrument according to claim 1, characterized in that: A mesh layer (24) is fixed on the front side of the cross block (22), and a series of guide holes (25) are distributed on the mesh layer (24). The mesh layer (24) can provide the cross block (22) and the slider (21) with pressure from the water flow, so that the water flow pressure acts on the slider (21).

3. The portable water flow rate measuring instrument according to claim 1, characterized in that: A guide mechanism (5) is added, comprising a guide cover (51) and a direction wing (52). The guide cover (51) is fixedly or rotatably mounted on the bottom of the tunnel pipe (11). A vertical direction wing (52) is fixed at the center of the end of the guide cover (51). Under the action of water flow, the direction wing (52) is always located in front of the water flow direction, thereby using the guide mechanism to determine the direction of the frame seat (1).

4. The portable water flow rate measuring instrument according to claim 1, characterized in that: The handheld assembly (7) includes a pipe section (71), a handle (72), a handheld device (74) and a main box (75), wherein the ends of the multiple pipe sections (71) are threadedly connected to form a combined vertical pipe, the upper end of the vertical pipe is fixedly mounted with a handle (72), the upper front end of the handle is provided with a wire hole (73), the inner cavity and the wire hole of the vertical pipe are respectively used to assemble a data line and a power line, and the data lines and power lines are connected to the interface of the main box (75) after being aggregated into a cable. A controller is provided in the main box (75), and the control end and the display output end of the controller are connected to the handheld device (74), and the handheld device is provided with corresponding control buttons and a display screen.

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