Portable high-precision flowmeter

Abstract

The invention provides a portable high-precision flowmeter, and relates to the field of ultrasonic flowmeters. An ultrasonic flowmeter body is installed on the front side of the upper portion of the vertical rod, two cables are inserted into two connectors in the bottom of the ultrasonic flowmeter body, and the other ends of the two cables are both connected with a measurement sensing assembly. The upper portion of the rear side of the vertical rod is fixedly connected with a mounting plate. Through the arrangement of the cable automatic winding mechanism, after the measurement work is finished, the driving motor can be started through the controller to wind the two cables, so that the problem that the cables are wound together is effectively avoided, the cables do not need to be rearranged in the next use process, and the trouble brought to the next use is avoided; the problem that when an existing ultrasonic flowmeter is used, due to the fact that a supporting base at the lower end of a vertical rod is usually designed to be a base with a large area in order to guarantee the stability of the ultrasonic flowmeter in the using process, the supporting base is still not convenient enough to carry is solved.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic flowmeters, and in particular to a portable high-precision flowmeter. Background Art

[0002] A flow meter is an instrument used to measure the flow of fluid in a pipeline or open channel. At present, when it is necessary to measure the flow of a pipeline without a flow meter installed, an ultrasonic flow meter is generally used. Ultrasonic flow meter is a flow meter with high accuracy and wide application range. Ultrasonic flow meter refers to a flow meter developed based on the principle that the propagation speed of ultrasonic waves in a flowing medium is equal to the vector sum of the average flow velocity of the measured medium and the speed of the sound wave in a stationary medium. It is mainly composed of a transducer and a converter. There are different types such as Doppler method, velocity difference method, beam deviation method, noise method and correlation method.

[0003] Although the existing ultrasonic flowmeter is portable and has high accuracy when in use, in order to ensure the stability of the ultrasonic flowmeter when in use, the lower end support seat of the vertical pole on the portable ultrasonic flowmeter is usually designed to be a larger base. This is still not convenient when carrying, and the cables connected to the main body of the ultrasonic flowmeter often need to be manually arranged after use. In order to save trouble, some staff members will randomly wrap the cables. In this way, the cables need to be rearranged when they are used next time, which causes trouble for the next use. Summary of the invention

[0004] The disclosed embodiment relates to a portable high-precision flow meter, which, through the setting of an automatic cable winding mechanism, can start the driving motor through the controller after the measurement work is completed, and wind up the two cables, thereby effectively avoiding the problem of the cables being tangled together. In this way, there is no need to rearrange the cables when using them next time, avoiding trouble for the next use; through the cooperation of the metal support rod and the magnet block, when the flow meter needs to be carried, the metal support rod can be folded upward by ninety degrees. After all three metal support rods are folded upward, the metal support rods are effectively reduced and no longer occupy a large amount of space, thereby improving the convenience of carrying the flow meter.

[0005] In a first aspect of the present disclosure, a portable high-precision flowmeter is provided, which specifically includes: a vertical rod; an ultrasonic flowmeter main body is installed on the front side of the upper part of the vertical rod, and two cables are inserted into the two interfaces at the bottom of the ultrasonic flowmeter main body, and the other ends of the two cables are both connected to a measurement sensing component; an installation plate is fixedly connected to the upper part of the rear side of the vertical rod, and a cable automatic rewinding mechanism and a positioning frame are installed on the rear end face of the installation plate, and the positioning frame is located below the cable automatic rewinding mechanism; a locking mechanism is installed on the rear side of the positioning frame; a controller is installed on the left side of the front end face of the installation plate; the lower end of the vertical rod is fixedly connected to a hexagonal base, and three U-shaped rotating blocks are annularly arranged around the outside of the hexagonal base, and a limiting component is installed outside each U-shaped rotating block.

[0006] In at least some embodiments, a metal support rod is rotatably connected to the inside of each of the U-shaped rotating blocks through a rotating shaft, and a circular backing plate is provided on the outside of the bottom end face of each metal support rod; a plugging hole is formed on each metal support rod.

[0007] In at least some embodiments, a hexagonal mounting block is fixedly installed on the outside of the vertical rod, and three magnet blocks are annularly arranged around the outside of the hexagonal mounting block; two moving wheels are installed on the front side of the hexagonal base; when the three metal support rods are in a folded and retracted state, the three metal support rods are magnetically attracted to the three magnet blocks respectively.

[0008] In at least some embodiments, an electromagnet is installed on the rear end face of the installation plate, and the electromagnet is located directly below the locking mechanism.

[0009] In at least some embodiments, the cable automatic rewinding mechanism includes a rewinding rotating shaft, a rewinding disk, a locking gear and a driving motor. The rewinding rotating shaft is rotatably connected to the upper side of the rear end face of the installation plate, and a rewinding disk is fixedly installed on the left and right sides of the outside of the rewinding rotating shaft. The two cables are respectively wound on the two rewinding disks; a locking gear and a driven belt pulley are installed on the outside of the rewinding rotating shaft, and the driven belt pulley is located on the left side of the locking gear; the driving motor is installed on the rear end face of the installation plate, and a driving belt pulley is installed on the rotating shaft of the driving motor, and the driving belt pulley is connected to the driven belt pulley through a belt; the driving motor and the electromagnet are both electrically connected to the controller.

[0010] In at least some embodiments, a clamping plate is slidably connected to the inside of the positioning frame, and a U-shaped stepping rod is fixedly connected to the bottom end face of the clamping plate; the U-shaped stepping rod penetrates through the bottom of the positioning frame, and springs are sleeved on both ends of the upper part of the U-shaped stepping rod; the clamping plate is used for clamping the measurement sensing component.

[0011] In at least some embodiments, the limiting component includes a rectangular sliding shell, a rectangular sliding block, a plug-in rod and a pulling rod. The rectangular sliding shell is fixedly mounted on the U-shaped rotating block, and the rectangular sliding block is slidably connected inside the rectangular sliding shell; the head end of the rectangular sliding block is provided with a plug-in rod that passes through the head of the rectangular sliding shell, and the tail end of the rectangular sliding block is provided with a pulling rod that passes through the tail of the rectangular sliding shell, and a spring is provided on the outside of the pulling rod and is located inside the rectangular sliding shell.

[0012] In at least some embodiments, when the limiting component is in the limiting state, the head end of the plug-in rod is plugged into the plug-in hole provided on the metal support rod.

[0013] In at least some embodiments, the locking mechanism includes a sliding frame, a rectangular slider, a top block, a locking strip, a pull rod and a metal block. The sliding frame is fixedly connected to the rear side of the positioning frame, and a rectangular slider is slidably connected inside the sliding frame; the upper end surface of the rectangular slider is provided with a top block passing through the top of the sliding frame, and the upper end surface of the top block is provided with two locking strips; the lower end surface of the rectangular slider is provided with a pull rod passing through the bottom of the sliding frame, and the outside of the pull rod is located inside the sliding frame and is provided with a spring; the lower end of the pull rod is fixedly connected to a metal block, and the metal block is located directly above the electromagnet.

[0014] In at least some embodiments, when the electromagnet is powered off, the two locking strips will be in close contact with the lower side of the outer circumference of the locking gear. When the electromagnet is powered on, the electromagnet will be magnetically attracted to the metal block and the two locking strips will be separated from the lower side of the outer circumference of the locking gear.

[0015] The present invention provides a portable high-precision flow meter, which has the following beneficial effects: 1. Through the setting of the automatic cable reeling mechanism, after the measurement work is completed, the driving motor can be started through the controller to reel in the two cables, and then the U-shaped pedal rod is stepped down by the foot to place the two measuring sensor components on the upper end surface of the splint, and the U-shaped pedal rod is released, so that the splint moves upward under the action of the external spring of the U-shaped pedal rod, thereby clamping and fixing the two measuring sensor components, thereby effectively avoiding the problem of cable entanglement. In this way, there is no need to rearrange the cables when using them next time, avoiding trouble for the next use.

[0016] 2. Through the cooperation of the metal support rod and the magnet block, when the flow meter needs to be carried, first pull the pull rod to its tail end to pull the plug rod out from the plug hole, then fold the metal support rod upward by ninety degrees to make the metal support rod magnetically attracted to the magnet block. After all three metal support rods are folded upward, the metal support rods are effectively reduced and no longer occupy a large amount of space, thereby improving the convenience of carrying the flow meter.

[0017] 3. Through the cooperation of the electromagnet and the locking mechanism, when the cable is wound, the electromagnet can be turned off through the controller to make the metal block lose its magnetic attraction. Then the rectangular slider moves upward with the top block and the two locking strips under the action of the spring force outside the pull rod, so that the two locking strips will be in close contact with the lower side of the outer peripheral surface of the locking gear, so that the locking gear, the winding shaft and the two winding reels can be effectively locked and limited, avoiding the loosening of the cable wound on the outside of the winding reel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0019] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0020] In the attached picture: Figure 1 A structural diagram showing the overall structure of the present application; Figure 2 A schematic diagram showing the structure of the present application from a rear perspective; Figure 3 A schematic diagram of the structure of the present application in a split state is shown; Figure 4 A schematic diagram of the structure of the metal support rod of the present application in a folded state is shown; Figure 5 A schematic diagram showing the structure of the hexagonal base, the U-shaped rotating block, the metal support rod and the limiting component of the present application is shown; Figure 6 A schematic diagram of the structure of the automatic cable winding mechanism and the positioning frame of the present application is shown; Figure 7 A schematic structural diagram of the electromagnet, locking gear and locking mechanism of the present application is shown.

[0021] Reference numerals list 1. Pole; 101. Hexagonal base; 102. U-shaped rotating block; 103. Metal support rod; 104. Moving wheel; 105. Hexagonal mounting block; 106. Magnet block; 107. Mounting plate; 108. Electromagnet; 109. Plug hole; 2. Ultrasonic flow meter body; 201. Cable; 202. Measurement sensor component; 3. Automatic cable winding mechanism; 301. Winding shaft; 302. Winding reel; 303. Locking gear; 304. Driving motor; 4. Positioning frame; 401. Clamp; 402. U-shaped pedal rod; 5. Controller; 6. Limiting component; 601. Rectangular sliding shell; 602. Rectangular sliding block; 603. Insertion rod; 604. Pulling rod; 7. Locking mechanism; 701. Sliding frame; 702. Rectangular slider; 703. Top block; 704. Locking strip; 705. Pull rod; 706. Metal block. Specific embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0023] Embodiment 1: Please refer to Figures 1 to 7 : The present invention provides a portable high-precision flowmeter, including: a vertical rod 1; an ultrasonic flowmeter main body 2 is installed on the front side of the upper part of the vertical rod 1, and two cables 201 are inserted into the two interfaces at the bottom of the ultrasonic flowmeter main body 2, and the other ends of the two cables 201 are both connected to a measurement sensing component 202; a mounting plate 107 is fixedly connected to the upper part of the rear side of the vertical rod 1, and a cable automatic rewinding mechanism 3 and a positioning frame 4 are installed on the rear end face of the mounting plate 107, and the positioning frame 4 is located below the cable automatic rewinding mechanism 3; a locking mechanism 7 is installed on the rear side of the positioning frame 4; a controller 5 is installed on the left side of the front end face of the mounting plate 107; the lower end of the vertical rod 1 is fixedly connected to a hexagonal base 101, and three U-shaped rotating blocks 102 are installed in a circumferential array on the outer periphery of the hexagonal base 101, and a limiting component 6 is installed outside each U-shaped rotating block 102; a metal support rod 103 is rotatably connected to the inside of each U-shaped rotating block 102 through a rotating shaft, and a circular cushion plate is provided on the outer side of the bottom end face of each metal support rod 103; a plugging hole 109 is formed in each metal support rod 103 for plugging with the insertion rod 603.

[0024] A hexagonal mounting block 105 is fixedly installed on the outside of the vertical rod 1, and three magnet blocks 106 are installed in a circumferential array on the outer periphery of the hexagonal mounting block 105; two moving wheels 104 are installed on the front side of the hexagonal base 101; when the three metal support rods 103 are in a folded and retracted state, the three metal support rods 103 are magnetically attracted to the three magnet blocks 106 respectively; an electromagnet 108 is installed on the rear end face of the mounting plate 107, and the electromagnet 108 is located directly below the locking mechanism 7, and the electromagnet 108 is provided for magnetically attracting the metal block 706 downward.

[0025] The cable automatic winding mechanism 3 includes a winding shaft 301, a winding disk 302, a locking gear 303 and a driving motor 304. The winding shaft 301 is rotatably connected to the upper side of the rear end surface of the mounting plate 107, and a winding disk 302 is fixedly installed on the left and right sides of the outside of the winding shaft 301, and the two cables 201 are respectively wound on the two winding disks 302; the locking gear 303 and the passive pulley are installed on the outside of the winding shaft 301, and the passive pulley is located on the left side of the locking gear 303; the driving motor 304 is installed on the rear end surface of the mounting plate 107, and a driving pulley is installed on the shaft of the driving motor 304, and the driving pulley is connected to the passive pulley through a belt transmission; the driving motor 304 and the electromagnet 108 are both electrically connected to the controller 5; through the setting of the cable automatic winding mechanism 3, the cable 201 can be wound.

[0026] A clamping plate 401 is slidably connected inside the positioning frame 4, and a U-shaped pedaling rod 402 is fixedly connected to the bottom end surface of the clamping plate 401; the U-shaped pedaling rod 402 passes through the bottom of the positioning frame 4, and springs are sleeved on both ends of the upper part of the U-shaped pedaling rod 402; the clamping plate 401 is used to clamp the measuring sensor component 202.

[0027] The limiting component 6 includes a rectangular sliding shell 601, a rectangular sliding block 602, a plug-in rod 603 and a pulling rod 604. The rectangular sliding shell 601 is fixedly installed on the U-shaped rotating block 102, and the rectangular sliding block 602 is slidably connected inside the rectangular sliding shell 601; the head end of the rectangular sliding block 602 is provided with a plug-in rod 603 that passes through the head of the rectangular sliding shell 601, and the tail end of the rectangular sliding block 602 is provided with a pulling rod 604 that passes through the tail of the rectangular sliding shell 601, and the outside of the pulling rod 604 is located inside the rectangular sliding shell 601 and is provided with a spring; through the setting of the limiting component 6, it is used to limit the metal support rod 103.

[0028] When the limiting component 6 is in the limiting state, the head end of the plug-in rod 603 is plugged into the plug-in hole 109 provided on the metal support rod 103, so that the metal support rod 103 is effectively limited.

[0029] Embodiment 2, based on embodiment 1, as Figure 2 and Figure 7As shown, the locking mechanism 7 includes a sliding frame 701, a rectangular slider 702, a top block 703, a locking strip 704, a pull rod 705 and a metal block 706. The sliding frame 701 is fixedly connected to the rear side of the positioning frame 4, and the sliding frame 701 is slidably connected with the rectangular slider 702; the upper end surface of the rectangular slider 702 is provided with a top block 703 that passes through the top of the sliding frame 701, and the upper end surface of the top block 703 is provided with two locking strips 704; the lower end surface of the rectangular slider 702 is provided with a pull rod 705 that passes through the bottom of the sliding frame 701, and the outside of the pull rod 705 is located inside the sliding frame 701 and is provided with a spring; the lower end of the pull rod 705 is fixedly connected with a metal block 706, and the metal block 706 is located directly above the electromagnet 108; through the setting of the locking mechanism 7, it is used to lock and limit the locking gear 303, the winding shaft 301 and the two winding disks 302.

[0030] When the electromagnet 108 is powered off, the two locking strips 704 will be in close contact with the lower side of the outer circumference of the locking gear 303. When the electromagnet 108 is powered on, the electromagnet 108 will be magnetically attracted to the metal block 706, and the two locking strips 704 will be separated from the lower side of the outer circumference of the locking gear 303.

[0031] The working principle of this embodiment: when in use, first place the flow meter on the ground at the use site, then unfold the three metal support rods 103 in turn, and then manually pull the pull rod 604 toward its tail end, thereby moving the rectangular sliding block 602 and the plug-in rod 603 toward the tail end of the pull rod 604, and then when the metal support rod 103 is in a horizontal state, release the pull rod 604, and then the rectangular sliding block 602 moves toward the head end of the plug-in rod 603 under the action of the external spring force of the pull rod 604, so that the head end of the plug-in rod 603 is inserted into the plug-in hole 109 opened on the metal support rod 103, so that the metal support rod 103 is limited, and then the three metal support rods 103 in the unfolded state are used to provide a stable support for the flow meter.

[0032] Then, the U-shaped pedal rod 402 is stepped on downward by the foot, so that the U-shaped pedal rod 402 moves downward with the clamping plate 401, so that the two measuring sensor components 202 lose their clamping and positioning function, and then the two measuring sensor components 202 are taken out from the inside of the positioning frame 4; then, the electromagnet 108 is turned on by the controller 5, so that the electromagnet 108 generates magnetic force, and then the metal block 706 is magnetically attracted, and then the metal block 706 moves downward with the pull rod 705, the rectangular slider 702, the top block 703 and the two locking strips 704 under the action of the magnetic force. Move so that the two locking strips 704 will be separated from the lower side of the outer circumference of the locking gear 303, and then pull the two cables 201 connected to the two measuring sensor components 202 backwards, thereby causing the two winding reels 302 to rotate clockwise (viewed from left to right), and then place the two measuring sensor components 202 on the outer wall of the pipe to be measured, and transmit the measured values ​​to the ultrasonic flowmeter body 2 through the two measuring sensor components 202, and finally display the values ​​on the display screen on the ultrasonic flowmeter body 2, and now the measurement of the flow in the pipe is completed.

[0033] After the measurement work is completed, the driving motor 304 is started by the controller 5, and then the rotating shaft of the driving motor 304 drives the active pulley, the passive pulley, the winding shaft 301 and the two winding reels 302 to rotate counterclockwise, so that the two cables 201 are wound. When the two cables 201 are wound, the driving motor 304 can be turned off, and then the U-shaped pedal rod 402 is stepped on downward by the foot, so that the U-shaped pedal rod 402 moves downward with the clamping plate 401, and then the two measuring sensor components 202 are placed on the upper end surface of the clamping plate 401, and the U-shaped pedal rod 402 is loosened, so that the clamping plate 401 moves upward under the action of the external spring of the U-shaped pedal rod 402, so that the two measuring sensor components 202 are clamped and fixed, thereby effectively avoiding the problem of the cables 201 being entangled in a ball; When the cable 201 is wound, the electromagnet 108 is turned off through the controller 5, so that the metal block 706 loses its magnetic attraction. Then, the rectangular slider 702 moves upward with the top block 703 and the two locking strips 704 under the action of the external spring force of the pull rod 705, so that the two locking strips 704 will be in close contact with the lower side of the outer peripheral surface of the locking gear 303, so that the locking gear 303, the winding shaft 301 and the two winding disks 302 are effectively locked and limited.

[0034] When the flow meter needs to be carried, first pull the pulling rod 604 toward its tail end, thereby moving the rectangular sliding block 602 and the plug-in rod 603 toward the tail end of the pulling rod 604, so that the plug-in rod 603 is pulled out from the inside of the plug-in hole 109, so that the metal support rod 103 loses its limiting effect, and then fold the metal support rod 103 upward by ninety degrees so that the metal support rod 103 is magnetically attracted to the magnet block 106. After all three metal support rods 103 are folded upward, the metal support rods 103 are effectively reduced and no longer occupy a large amount of space. Finally, the flow meter can be moved by the two moving wheels 104.

[0035] In this article, there are a few points to note: 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0036] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0037] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A portable high-precision flow meter, comprising: Vertical pole (1); an ultrasonic flowmeter main body (2) is installed on the front side of the upper part of the vertical pole (1), and two cables (201) are inserted into the two interfaces at the bottom of the ultrasonic flowmeter main body (2), and the other ends of the two cables (201) are both connected to a measurement sensing component (202); it is characterized in that an installation plate (107) is fixedly connected to the upper part of the rear side of the vertical pole (1), and a cable automatic winding mechanism (3) and a positioning frame (4) are installed on the rear end face of the installation plate (107), and the positioning frame (4) is located below the cable automatic winding mechanism (3); a locking mechanism (7) is installed on the rear side of the positioning frame (4); a controller (5) is installed on the left side of the front end face of the installation plate (107); the lower end of the vertical pole (1) is fixedly connected with a hexagonal base (101), and three U-shaped rotating blocks (102) are installed in a circumferential array on the outer circumference of the hexagonal base (101), and a limiting component (6) is installed outside each U-shaped rotating block (102).

2. A portable high-precision flow meter according to claim 1, characterized in that: A metal support rod (103) is rotatably connected to the inside of each U-shaped rotating block (102) through a rotating shaft, and a circular cushion plate is arranged on the outer side of the bottom end face of each metal support rod (103); a plug hole (109) is formed in each metal support rod (103).

3. A portable high-precision flow meter according to claim 2, characterized in that: A hexagonal mounting block (105) is fixedly installed on the outside of the vertical pole (1), and three magnet blocks (106) are installed in a circumferential array on the outer circumference of the hexagonal mounting block (105); two moving wheels (104) are installed on the front side of the hexagonal base (101); when the three metal support rods (103) are in a folded and retracted state, the three metal support rods (103) are magnetically attracted to the three magnet blocks (106) respectively.

4. A portable high-precision flow meter according to claim 1, characterized in that: An electromagnet (108) is installed on the rear end face of the installation plate (107), and the electromagnet (108) is located directly below the locking mechanism (7).

5. A portable high-precision flow meter according to claim 4, characterized in that: The cable automatic winding mechanism (3) includes a winding rotating shaft (301), a winding disc (302), a locking gear (303) and a driving motor (304). The winding rotating shaft (301) is rotatably connected to the upper side of the rear end face of the installation plate (107), and a winding disc (302) is fixedly installed on the left and right sides of the outside of the winding rotating shaft (301). The two cables (201) are respectively wound on the two winding discs (302); a locking gear (303) and a driven pulley are installed on the outside of the winding rotating shaft (301), and the driven pulley is located on the left side of the locking gear (303); the driving motor (304) is installed on the rear end face of the installation plate (107), and a driving pulley is installed on the rotating shaft of the driving motor (304), and the driving pulley is传动连接 to the driven pulley through a belt.

6. A portable high-precision flow meter according to claim 1, characterized in that: A clamping plate (401) is slidably connected to the inside of the positioning frame (4), and a U-shaped stepping rod (402) is fixedly connected to the bottom end face of the clamping plate (401); the U-shaped stepping rod (402) penetrates through the bottom of the positioning frame (4), and springs are sleeved on both ends of the upper part of the U-shaped stepping rod (402); the clamping plate (401) is used for clamping the measurement sensing component (202).

7. A portable high-precision flow meter according to claim 2, characterized in that: The limiting component (6) comprises a rectangular sliding shell (601), a rectangular sliding block (602), a plug-in rod (603) and a pulling rod (604); the rectangular sliding shell (601) is fixedly mounted on the U-shaped rotating block (102), and the rectangular sliding block (602) is slidably connected inside the rectangular sliding shell (601); the head end of the rectangular sliding block (602) is provided with a plug-in rod (603) penetrating the head of the rectangular sliding shell (601), and the tail end of the rectangular sliding block (602) is provided with a pulling rod (604) penetrating the tail of the rectangular sliding shell (601), and the outside of the pulling rod (604) is located inside the rectangular sliding shell (601) and is sleeved with a spring.

8. A portable high-precision flow meter according to claim 7, characterized in that: When the limiting component (6) is in the limiting state, the head end of the plug-in rod (603) is plugged into the plug-in hole (109) provided on the metal support rod (103).

9. A portable high-precision flow meter according to claim 5, characterized in that: The locking mechanism (7) comprises a sliding frame (701), a rectangular slider (702), a top block (703), a locking strip (704), a pull rod (705) and a metal block (706); the sliding frame (701) is fixedly connected to the rear side of the positioning frame (4), and the sliding frame (701) is slidably connected with the rectangular slider (702) inside; the upper end surface of the rectangular slider (702) is provided with a top block (703) penetrating the top of the sliding frame (701), and the upper end surface of the top block (703) is provided with two locking strips (704); the lower end surface of the rectangular slider (702) is provided with a pull rod (705) penetrating the bottom of the sliding frame (701), and the outside of the pull rod (705) is located inside the sliding frame (701) and is sleeved with a spring; the lower end of the pull rod (705) is fixedly connected with the metal block (706), and the metal block (706) is located directly above the electromagnet (108).

10. A portable high-precision flow meter according to claim 9, characterized in that: When the electromagnet (108) is powered off, the two locking strips (704) will be in close contact with the lower side of the outer peripheral surface of the locking gear (303); when the electromagnet (108) is powered on, the electromagnet (108) will be magnetically attracted to the metal block (706), and the two locking strips (704) will be separated from the lower side of the outer peripheral surface of the locking gear (303).

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