An automatic measuring device for small-capacity measuring instruments

Abstract

This utility model relates to the field of metrology, specifically to an automatic metering device for small-capacity measuring instruments. The device includes a water storage tank, a thermos flask, a base, an electronic scale, a support, a position adjustment assembly, a liquid dispensing pipe, and a liquid level positioning assembly. The water storage tank is connected to the thermos flask via a first pipeline for liquid supply. The liquid dispensing pipe is connected to the bottom of the thermos flask via a conduit to form a first passage, on which a first control valve is installed. The position adjustment assembly is used to adjust the positions of the liquid dispensing pipe and the liquid level positioning sensor, aligning them with the opening and scale line of the instrument to be measured, respectively. When the liquid level positioning sensor transmits a signal indicating that liquid has been added to the scale line of the instrument, the first control valve closes, stopping the dispensing. It also includes a water collection tank connected to the water storage tank via a purifier and a conduit, used to collect the water used after metering. This device solves the problems of errors caused by human operation and water waste in traditional metering methods, ensuring the accuracy and automation of the liquid dispensing volume.

Description

Technical Field

[0001] This utility model relates to the field of metrology, specifically to an automatic measuring device for small-capacity measuring instruments. Background Technology

[0002] In the field of metrology for small-volume measuring instruments, traditional methods are mostly manual, which presents numerous problems. On the one hand, manual metrology is inefficient and cannot meet the needs of large-scale production or testing. For example, when manually calibrating small measuring instruments, the number calibrated is generally around 20-30 per day. On the other hand, manual operation is easily affected by subjective factors, leading to low metrological accuracy and significant errors. Furthermore, the metrology of some small-volume measuring instruments requires specific temperature conditions, which traditional methods struggle to maintain, thus affecting the accuracy of the results. For instance, in chemical applications, traditional metrology relies on visual observation, manual recording, statistics, and calculation, resulting in human error in calibration. The adverse effects of such errors are often very serious. Therefore, developing a device capable of automatically, accurately, and at a constant temperature for the metrology of small-volume measuring instruments is of significant practical importance. Existing utility model patent CN213658029U discloses an automatic calibration device for measuring instruments. This device is mainly designed for larger-capacity measuring instruments such as graduated cylinders, measuring cups, and single-gradient volumetric flasks. However, its applicability and accuracy for measuring smaller-capacity measuring instruments, especially in situations requiring precise control of liquid temperature and level, still need improvement. Furthermore, the device does not monitor and adjust the liquid temperature in real time during the liquid addition process, making it difficult to meet the needs of some small-capacity measuring instruments requiring measurement under specific temperature conditions. Additionally, the device does not involve water recycling, failing to effectively reduce operating costs and improve environmental performance. Utility Model Content

[0003] The purpose of this invention is to provide an automatic metering device for small-capacity measuring instruments to solve the problems of low metering efficiency, insufficient metering accuracy, difficulty in constant temperature control, and waste of water resources in the existing technology.

[0004] To achieve the above objectives, the following technical solution is adopted.

[0005] An automatic measuring device for small-capacity measuring instruments includes a water storage tank, a thermos flask connected to the water storage tank via a first pipeline for liquid supply, a base, an electronic scale mounted on the base, and a bracket mounted on the base. The bracket is equipped with a position adjustment component, which includes a liquid dispensing pipe and a liquid level positioning component. The position adjustment component is used to adjust the liquid dispensing pipe to align with the opening of the measuring instrument placed on the electronic scale, and also to adjust the liquid level positioning sensor in the liquid level positioning component to align with the scale line of the measuring instrument. The liquid dispensing pipe is connected to the bottom of the thermos flask via a conduit to form a first passage. A first control valve is provided on the first passage to control the opening and closing of the first passage. When a signal is received from the liquid level positioning sensor, liquid dispensing stops when the volume of the measuring instrument reaches the scale line. The device also includes a calculation module that receives the difference in volume between the electronic scale before and after liquid dispensing to calculate the volume of the measuring instrument. Finally, it includes a water collection tank connected to the water storage tank via a purifier and a conduit, used to collect the water used after measurement.

[0006] Optionally, the position adjustment assembly includes a first slide rod that is horizontally connected to the support and slides up and down, a second slide rod that is perpendicular to the first slide rod in the horizontal plane and slides laterally on the first slide rod, a third slide rod that is vertically connected to one end of the second slide rod in the horizontal plane, and a liquid addition tube and a liquid level positioning assembly that are slidably connected to the third slide rod respectively.

[0007] Optionally, the liquid level positioning sensor in the liquid level positioning assembly is a laser positioning sensor.

[0008] Optionally, the liquid level positioning assembly includes a sliding seat slidably connected to the third sliding rod, a fourth sliding rod disposed on the sliding seat and vertically slidably connected to the sliding seat, and a liquid level positioning sensor disposed at the bottom of the fourth sliding rod; the liquid level positioning sensor is directed toward the device to be measured.

[0009] Optionally, it may also include a drive mechanism, the drive mechanism comprising,

[0010] A first drive pump is installed on a first pipeline between the water storage tank and the thermos bottle;

[0011] A second drive pump is installed on the first passage;

[0012] A driving component for driving the position adjustment component to move.

[0013] Optionally, the thermostatic bottle is equipped with a temperature sensor for detecting the temperature inside the thermostatic bottle.

[0014] Optionally, the electronic scale is provided with a measuring instrument fixing component for fixing the measuring instrument to be measured on the electronic scale.

[0015] Optionally, the first pipeline is provided with a liquid outlet, which is used to connect to a thermos bottle of other metering devices and / or connect back to the water collection tank; the liquid outlet is provided with a second control valve.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This application provides an automatic metering device for small-volume measuring instruments. It achieves automatic metering of small-volume measuring instruments by incorporating components such as a water storage tank, a constant temperature bottle, an electronic scale, a support, a position adjustment assembly, a dispensing pipette, and a liquid level positioning assembly. The device automatically adjusts the positions of the dispensing pipette and the liquid level positioning sensor, aligning them with the opening and graduation line of the instrument being measured, thus solving the error problem caused by human operation in traditional metering methods and improving the accuracy and efficiency of metering. Furthermore, the first control valve precisely controls the dispensing process, ensuring the accuracy and automation of the dispensing volume. A water collection tank and a purifier are also included. The water collection tank collects the water used after metering, while the purifier treats the collected water for reuse in the metering process. This achieves water resource recycling, reduces operating costs, minimizes environmental impact, and improves the environmental performance of the device.

[0018] The structure of the position adjustment component has been refined, including a first slide bar set horizontally, a second slide bar perpendicular to the first slide bar in the horizontal plane, and a third slide bar perpendicular to the second slide bar. This multi-dimensional sliding connection design allows the device to flexibly adjust the position of the liquid dispensing tube and the liquid level positioning component to adapt to measuring instruments of different shapes and sizes, improving the versatility and flexibility of the device.

[0019] The liquid level positioning sensor in the liquid level positioning assembly is a laser positioning sensor. Laser positioning sensors are characterized by high precision and fast response speed, enabling accurate detection of the liquid level position, further improving the accuracy and reliability of measurement. Compared to traditional manual observation or mechanical sensors, laser positioning sensors can significantly reduce errors and improve measurement efficiency.

[0020] The liquid level positioning assembly comprises a sliding base, a fourth sliding rod, and a liquid level positioning sensor. This structural design allows the liquid level positioning sensor to perform fine-tuning in the vertical direction, further improving the accuracy of liquid level positioning. Simultaneously, the sensor's detection direction is towards the object being measured, ensuring the accuracy and stability of the detection signal.

[0021] The drive mechanism includes a first drive pump, a second drive pump, and a drive assembly. The first drive pump drives the liquid flow between the water storage tank and the thermostat bottle, the second drive pump controls the liquid addition process of the liquid dispensing pipette, and the drive assembly drives the movement of the position adjustment assembly. This further improves the automation level of the device, reduces manual intervention, and improves metering efficiency and accuracy.

[0022] A temperature sensor is installed inside the thermostatic flask to detect the temperature within the flask. This ensures a constant temperature for the liquid during the measurement process, significantly improving the accuracy of measurements for small-volume instruments that require measurement under specific temperature conditions. The real-time monitoring function of the temperature sensor can also promptly detect temperature anomalies, ensuring the stability and reliability of the measurement process.

[0023] A measuring instrument fixing component is installed on the electronic scale to secure the measuring instrument to the scale. This improves the stability of the measuring instrument during the measurement process and reduces measurement errors caused by instrument shaking or positional deviation. The fixing component ensures the stability of the measuring instrument during liquid addition and liquid level positioning, further improving the accuracy and reliability of the measurement. A liquid outlet is provided on the first pipeline, equipped with a second control valve. The liquid outlet is used to connect to a thermos bottle of other measuring devices or to return the liquid to the collection tank, increasing the versatility and flexibility of the device. The second control valve allows for precise control of the opening and closing of the liquid outlet, ensuring the rational distribution and recycling of the liquid, improving the practicality and economy of the device. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an embodiment of an automatic measuring device for small-capacity measuring instruments according to this utility model.

[0025] Figure 2 This is a detailed schematic diagram of the position adjustment component of an embodiment of an automatic metering device for small-capacity measuring instruments according to this utility model. The components include: 1. Base; 2. Water collection tank; 3. Water storage tank; 4. Thermostatic bottle; 5. Support; 6. Electronic scale; 7. Measured instrument; 8. Liquid dispensing tube; 9. First slide bar; 10. Second slide bar; 11. Third slide bar; 12. Sliding seat; 13. Fourth slide bar; 14. Liquid level positioning sensor; 15. Temperature sensor; 16. Purifier. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0027] The following detailed description is exemplary and intended to provide further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention.

[0028] like Figure 1 and Figure 2 As shown, this utility model provides an automatic measuring device for small-capacity measuring instruments, specifically including:

[0029] The water storage tank 3 can be a cylindrical container made of food-grade 304 stainless steel to ensure the hygiene and safety of the liquid. The tank 3 has a diameter of 30 cm, a height of 50 cm, and a total capacity of approximately 37.5 liters. The top of the tank 3 can have a 10 cm diameter circular opening for adding liquid, and the opening can be fitted with a sealing cap to prevent dust and impurities from entering. The sealing cap can be made of food-grade silicone, offering excellent sealing and corrosion resistance. The side of the tank 3 can have a liquid level observation window made of transparent polycarbonate material, clearly displaying the liquid level inside. The observation window can be 45 cm high and 5 cm wide, and can be marked with graduations for easy viewing of the liquid level in the tank 3.

[0030] The thermos flask 4 can be a rectangular container made of food-grade 304 stainless steel. The thermos flask 4 can house heating and cooling devices. The heating device can be a 500-watt electric heating element, installed at the bottom of the thermos flask 4 and fixed by a stainless steel bracket 5. The cooling device can be a small semiconductor cooling chip, installed on the side of the thermos flask 4, with dimensions of 10 cm × 10 cm and a cooling power of 200 watts. The thermos flask 4 can also house a temperature sensor 15, using a high-precision NTC thermistor with a measurement accuracy of ±0.05℃. The temperature sensor 15 can be connected to a control unit via wires to monitor the liquid temperature inside the thermos flask 4 in real time. The control unit can automatically adjust the operating status of the heating element and cooling chip according to a preset temperature value using a PID control algorithm to ensure the liquid temperature inside the thermos flask 4 is maintained at the set value, for example, 25℃. The top of the thermos flask 4 can have a circular opening with a diameter of 8 cm for connecting to a dropper 8. The opening can be equipped with a sealing gasket and a threaded cap to ensure a tight seal. The sealing gasket can be made of food-grade silicone, and the threaded cap can be made of stainless steel.

[0031] The water storage tank 3 and the thermos flask 4 can be connected by a 1-meter-long, transparent PVC flexible hose with an inner diameter of 12 mm. The PVC hose offers good flexibility and corrosion resistance, adapting to various installation environments. One end of the hose connects to the outlet at the bottom of the water storage tank 3 via a threaded interface, and the other end connects to the inlet at the top of the thermos flask 4 via a threaded interface. A manual ball valve can be installed on the hose to control the liquid flow. The ball valve can be made of stainless steel, offering good corrosion resistance and sealing performance, and its handle design facilitates user operation.

[0032] The base 1 can be a rectangular structure made of high-strength aluminum alloy, providing excellent load-bearing capacity and stability. The base 1 can measure 60 cm × 40 cm × 10 cm, and its bottom can be equipped with four rubber feet, each with a diameter of 5 cm and a height of 2 cm. These rubber feet effectively prevent the base 1 from sliding during operation and also provide cushioning and shock absorption. The surface of the base 1 can be anodized, providing good wear resistance and corrosion resistance.

[0033] The electronic scale 6 can be installed in the center of the base 1, with dimensions of 30 cm × 30 cm, a maximum weighing capacity of 5 kg, and an accuracy of 0.1 g. The electronic scale 6 can employ a high-precision strain gauge sensor to accurately measure the mass change of the object to be measured 7. The surface of the electronic scale 6 can be equipped with an anti-slip rubber pad to fix the object to be measured 7 and prevent it from sliding during liquid addition. The measuring instrument fixing component can be an anti-slip rubber pad, which can be made of food-grade silicone material, providing good anti-slip performance. The electronic scale 6 can be connected to the control unit via wires to transmit the measured mass signal to the control unit for processing.

[0034] The bracket 5 can be installed on one side of the base 1, with a height of 1.2 meters and a width of 0.5 meters. The bracket 5 can be made of stainless steel, offering good strength and stability. The bracket 5 has a rectangular frame structure with multiple sliding rails for mounting the position adjustment components. The bottom of the bracket 5 can be bolted to the base 1 to ensure a secure installation. The surface of the bracket 5 can be polished, providing a good appearance and corrosion resistance.

[0035] As a specific example, the position adjustment component includes:

[0036] The first slide rod 9 can be one of the main parts of the position adjustment assembly. It can be 1 meter long and 2 centimeters in diameter, and is made of stainless steel. The first slide rod 9 can be horizontally mounted on top of the bracket 5 and connected to the bracket 5 via two stainless steel sliders. The sliders can have a T-shaped structure and threaded holes, and are fixed to the bracket 5 with bolts. The first slide rod 9 can slide up and down within the sliders, with a sliding range of 20 centimeters. Limiting blocks can be provided at both ends of the first slide rod 9 to prevent it from sliding out of the sliders.

[0037] The second slide rod 10 can be perpendicular to the first slide rod 9, with a length of 0.5 meters and a diameter of 2 centimeters, also made of stainless steel. The second slide rod 10 can be mounted on the first slide rod 9 via a stainless steel slider, the structure of which can be the same as the slider of the first slide rod 9. The second slide rod 10 can slide laterally within the slider, with a sliding range of 30 centimeters. One end of the second slide rod 10 can be provided with a vertical mounting base for a third slide rod 11. The mounting base can be L-shaped and fixed to the second slide rod 10 with bolts.

[0038] The third slide bar 11 can be perpendicular to the second slide bar 10, with a length of 0.3 meters and a diameter of 2 centimeters, and is made of stainless steel. The third slide bar 11 can be mounted on the mounting base of the second slide bar 10 via a stainless steel slider, the structure of which can be the same as the first two. The third slide bar 11 can slide up and down within the slider, with a sliding range of 15 centimeters. The third slide bar 11 can have two mounting holes for mounting the liquid-adding dropper 8 and the liquid level positioning assembly, respectively.

[0039] As a specific example, the liquid dispensing dropper 8 and the liquid level positioning assembly include:

[0040] The liquid dispensing dropper 8 can be a slender glass tube, 30 cm in length, with an inner diameter of 2 mm and an outer diameter of 4 mm. The top of the dropper 8 can be connected to the outlet at the bottom of the thermos flask 4 via a stainless steel connector. The connector can be threaded to ensure a tight seal. The bottom of the dropper 8 can be equipped with a 1 mm diameter dispensing nozzle to ensure a stable flow rate of liquid into the measuring device 7. A pressure regulating valve can be located on the side of the dropper 8. Adjusting the pressure regulating valve controls the dispensing speed. The pressure regulating valve can be a manual knob design, allowing the user to manually adjust the dispensing speed as needed.

[0041] The liquid level positioning assembly may include a sliding seat 12, a fourth sliding rod 13, and a liquid level positioning sensor 14. The sliding seat 12 may be made of aluminum alloy and has dimensions of 10 cm × 5 cm × 2 cm, and is bolted to the third sliding rod 11. The fourth sliding rod 13 may be vertically mounted on the sliding seat 12, has a length of 20 cm and a diameter of 1 cm, and is made of stainless steel. The fourth sliding rod 13 can slide up and down within the sliding seat 12, with a sliding range of 10 cm. The liquid level positioning sensor 14 may be mounted at the bottom of the fourth sliding rod 13, employing a high-precision laser positioning sensor, and its detection direction may be towards the object to be measured 7. The laser positioning sensor can be connected to the control unit via a wire to transmit the detected liquid level position signal to the control unit; in this embodiment, the liquid level positioning sensor in the liquid level positioning assembly may be a Keyence LJ-V7000 series laser displacement sensor. This sensor features high-precision measurement, is suitable for various industrial environments, and can provide high-resolution displacement measurement. The sensor monitors the liquid level position within the object to be measured in real time using the laser triangulation principle and transmits the measured signal to the control unit. The control unit automatically controls the liquid addition process of the liquid addition tube according to the preset liquid level value, ensuring that the liquid level reaches the predetermined scale line. The control unit can automatically control the liquid addition process of the liquid addition tube 8 according to the preset liquid level value, ensuring that the liquid level reaches the predetermined scale line.

[0042] As a preferred example, a water collection tank 2 is also included. The water collection tank 2 can be a rectangular container made of food-grade 304 stainless steel, with dimensions of 40 cm × 30 cm × 30 cm and a total capacity of approximately 36 liters. The top of the water collection tank 2 can have a circular opening with a diameter of 10 cm for collecting the metered water. The opening can be fitted with a sealing cap to prevent dust and impurities from entering. The sealing cap can be made of food-grade silicone, providing good sealing and corrosion resistance. The side of the water collection tank 2 can have a water outlet connected to the purifier 16 via a transparent PVC hose with an inner diameter of 12 mm and a length of 1 meter.

[0043] As a preferred example, the purifier 16 can employ a multi-stage filtration system, including a pre-filter, an activated carbon filter, and a reverse osmosis membrane filter. The pre-filter can use a 5-micron PP filter element to remove large particulate impurities from the water. The activated carbon filter can use granular activated carbon, which effectively removes odors and organic matter from the water. The reverse osmosis membrane filter can use an RO membrane, which removes dissolved solids and bacteria from the water. The outlet of the purifier 16 can be connected to the water storage tank 3 via a transparent PVC hose with an inner diameter of 12 mm and a length of 1 meter, enabling water recycling.

[0044] As a preferred example, it also includes a drive mechanism, specifically including

[0045] First drive pump: The first drive pump can be installed on the PVC hose between the water storage tank 3 and the thermos flask 4. It is a small submersible pump with a power of 100 watts and a flow rate of 10 liters / minute. The submersible pump can be connected to the control unit via wires, and its operation is controlled by the control unit. When it is necessary to transfer liquid from the water storage tank 3 to the thermos flask 4, the control unit can start the submersible pump to draw liquid from the water storage tank 3 into the thermos flask 4.

[0046] Second drive pump: The second drive pump can be installed at the inlet of the liquid addition tube 8. It is a small peristaltic pump with a power of 50 watts and a flow rate of 1 liter / minute. The peristaltic pump can be connected to the control unit via a wire, and its working status is controlled by the control unit. When liquid addition is required, the control unit can start the peristaltic pump to drip the liquid in the thermos flask 4 into the measuring device 7 through the liquid addition tube 8.

[0047] Drive Components: The drive components, including three small DC motors and corresponding drive circuits, are used to move the position adjustment components. Each DC motor has a power of 10 watts and a speed of 1000 rpm. The motors are connected to the sliders of the first slide bar 9, the second slide bar 10, and the third slide bar 11 via gear transmission mechanisms. By controlling the forward and reverse rotation of the motors, the sliders move on the slide bars. The drive circuits can employ PWM modulation technology, controlling the motor speed and direction through the PWM signal output from the control unit, thereby achieving precise movement of the position adjustment components.

[0048] As a preferred example, the system also includes a temperature sensor 15 and a calculation module. The temperature sensor 15, which can be installed inside the thermostat 4, employs a high-precision NTC thermistor with a measurement accuracy of ±0.05℃. The temperature sensor 15 can be connected to the control unit via wires to transmit the real-time detected temperature signal to the control unit. The control unit can automatically adjust the operating status of the heating element and the cooling element according to a preset temperature value using a PID control algorithm to ensure that the liquid temperature inside the thermostat 4 is maintained at the set value, such as 25℃.

[0049] The calculation module can be integrated into the control unit, employing a high-performance microcontroller, such as the STM32 series. The microcontroller receives the mass signal transmitted from the electronic scale 6 via an ADC module, calculates the mass difference before and after liquid addition, and thus determines the capacity of the device to be measured 7. The calculation results can be displayed on the operating interface via an LCD screen, allowing users to intuitively understand the measurement results. The calculation module can also have data storage capabilities, storing the results of each measurement in its internal memory for easy access to historical data.

[0050] As a specific example, this also includes a liquid outlet and a second control valve. The liquid outlet can be installed on the first pipeline, on a PVC hose located between the water storage tank 3 and the thermos flask 4. The liquid outlet can be made of stainless steel, with a diameter of 12 mm, and connects to the hose via a threaded interface. A manual ball valve can be installed at the liquid outlet to control the flow of liquid. The ball valve can also be made of stainless steel, offering good corrosion resistance and sealing performance, and its handle design facilitates user operation. The other end of the liquid outlet can be connected to the thermos flask 4 of other metering devices or returned to the water collection tank 2 via a transparent PVC hose with an inner diameter of 12 mm and a length of 1 meter, realizing liquid distribution and recycling. The second control valve can be installed at the liquid outlet, made of stainless steel, and its structure can be the same as the first control valve. The second control valve connects to the liquid outlet via a threaded interface to control the opening and closing of the liquid outlet. By manually operating the second control valve, the user can choose to deliver the liquid to other metering devices or return it to the water collection tank 2 according to actual needs, increasing the versatility and flexibility of the device. As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. An automatic measuring device for small-capacity measuring instruments, characterized in that, include, A water storage tank (3), a thermos bottle (4) connected to the water storage tank (3) via a first pipeline for liquid supply, a base (1), an electronic scale (6) mounted on the base (1), and a bracket (5) mounted on the base (1). The bracket (5) is equipped with a position adjustment component, which is equipped with a liquid addition dropper (8) and a liquid level positioning component. The position adjustment component is used to adjust the liquid addition dropper (8) to align with the opening of the measuring device (7) placed on the electronic scale (6), and also to adjust the liquid level positioning sensor (14) in the liquid level positioning component to align with the scale line of the measuring device (7). The liquid addition dropper (8) is connected to the bottom of the thermos bottle (4) via a conduit to form a first passage. A first control valve is provided on the first passage to control the opening and closing of the first passage. When the signal transmitted by the liquid level positioning sensor (14) is received, the liquid addition stops when the liquid is added to the scale line of the measuring device (7). It also includes a water collection tank (2), which is connected to the water storage tank (3) through a purifier (16) and a conduit. The water collection tank (2) is used to collect the water after it has been metered.

2. The automatic measuring device for small-capacity measuring instruments according to claim 1, characterized in that, The position adjustment assembly includes a first slide rod (9) that is horizontally connected to the bracket (5) and slides horizontally on the first slide rod (9) in a horizontal plane, a second slide rod (10) that is perpendicular to the first slide rod (9) in a horizontal plane, and slides horizontally on the first slide rod (9). A third slide rod (11) is vertically connected to one end of the second slide rod (10) in a horizontal plane, and a liquid adding tube (8) and a liquid level positioning assembly are slidably connected to the third slide rod (11).

3. An automatic measuring device for small-capacity measuring instruments according to any one of claims 1 and 2, characterized in that, The liquid level positioning sensor (14) in the liquid level positioning assembly is a laser positioning sensor.

4. The automatic measuring device for small-capacity measuring instruments according to claim 2, characterized in that, The liquid level positioning assembly includes a sliding seat (12) slidably connected to the third slide rod (11), a fourth slide rod (13) disposed on the sliding seat (12) and vertically slidably connected to the sliding seat (12), and a liquid level positioning sensor (14) disposed at the bottom of the fourth slide rod (13); the liquid level positioning sensor (14) is directed toward the device to be measured (7).

5. The automatic measuring device for small-capacity measuring instruments according to claim 1, characterized in that, It also includes a drive mechanism, which includes, The first drive pump is installed on the first pipeline between the water storage tank (3) and the thermostatic bottle (4); A second drive pump is installed on the first passage; A driving component for driving the position adjustment component to move.

6. The automatic measuring device for small-capacity measuring instruments according to claim 1, characterized in that, The constant temperature bottle (4) is equipped with a temperature sensor (15) for detecting the temperature inside the constant temperature bottle (4).

7. The automatic measuring device for small-capacity measuring instruments according to claim 1, characterized in that, The electronic scale (6) is provided with a measuring instrument fixing component for fixing the measuring instrument (7) to be measured on the electronic scale (6).

8. The automatic measuring device for small-capacity measuring instruments according to claim 1, characterized in that, The first pipeline is provided with a liquid outlet, which is used to connect to the thermos bottle (4) of other metering devices and / or connect back to the water collection tank (2); the liquid outlet is provided with a second control valve.

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