Online Vibrating Tube Liquid Density Meter Calibration Device

Abstract

An online vibrating tube liquid density meter calibration device comprises a measuring part, a circulating part and a moving device; the measuring part is used to install the density meter to be measured; the circulating part comprises: a plurality of calibration liquid circulating pipes for detecting the measuring part; and at least one cleaning circulating pipe for cleaning the measuring part; the moving device is used to move the measuring part between the calibration liquid circulating pipe and the cleaning circulating pipe to access one of the calibration liquid circulating pipe and the cleaning circulating pipe. When the density meter to be measured of the present invention switches between different calibration liquid circulating pipes for calibration, it is not necessary to replace the solvent in the calibration liquid circulating pipe (or reduce the number of replacements), which saves the time required for cleaning the pipe and the instrument, can greatly improve the calibration efficiency, meet the large-scale calibration needs of the density meter, and also reduce the impact caused by unclean cleaning pipes.

Description

Technical Field

[0001] The invention relates to a density meter calibration, in particular to an online vibration tube liquid density meter calibration device. Background Art

[0002] Online vibrating tube liquid density meter (hereinafter referred to as: density meter) is a high-precision, high-stability, high-anti-interference ability instrument. It is widely used in oil pipelines and refining, chemical and petrochemical, water treatment and sewage treatment, oil industry, pharmaceutical industry, coating industry, paper industry, textile printing and dyeing industry, fuel industry, food and beverage industry, etc. to measure the density and concentration of the medium.

[0003] At present, the calibration process of the density meter is cumbersome and time-consuming. For a density meter, at least three solvents with different densities (i.e. calibration media), multiple different temperature environments, multiple different pressure environments, and multiple different flow environments need to be calibrated. When switching different solvents, the pipelines and instruments need to be cleaned to avoid contamination of the new solution by residual media. This process requires a lot of manpower and time to complete. The most common calibration solutions are pure water, anhydrous ethanol, saline solution, etc., with multiple temperature points such as 15°C, 20°C, 25°C~60°C, etc. The control time of each solution at each temperature point ranges from a few hours to more than ten hours. In addition to the pressure condition verification, flow condition verification, and repeatability test condition verification, the time required is even longer. The efficiency is too low for large-scale calibration of density meters and cannot meet the large-scale calibration needs of density meters. Summary of the invention

[0004] According to one aspect of the present invention, there is provided an online vibrating tube liquid density meter calibration device, comprising a measuring part, a circulation part and a moving device;

[0005] The measuring part is used to install the density meter to be measured;

[0006] The loop portion includes:

[0007] A plurality of sets of calibration liquid circulation pipelines for testing the measuring part; and

[0008] At least one set of cleaning circulation pipeline for cleaning the measuring part;

[0009] The moving device is used to move the measuring part between the calibration liquid circulation pipeline and the cleaning circulation pipeline to connect to one of the calibration liquid circulation pipeline and the cleaning circulation pipeline.

[0010] The online vibrating tube liquid density meter calibration device of the present invention provides multiple sets of calibration liquid circulation pipes and moving devices. When calibrating the density meter to be measured with multiple different solvents, one solvent is injected into each set of calibration liquid circulation pipes, and different solvents are respectively injected into multiple sets of calibration liquid circulation pipes. When the density meter to be measured is switched between different calibration liquid circulation pipes for calibration, there is no need to replace the solvent in the calibration liquid circulation pipe (or reduce the number of replacements). After replacing a new density meter to be measured, there is no need to replace the solvent in the calibration liquid circulation pipe (or reduce the number of replacements). Therefore, the time required for cleaning the pipe and the instrument is saved, which can greatly improve the calibration efficiency and meet the large-scale calibration needs of the density meter. At the same time, the impact caused by unclean cleaning of the pipe is also reduced.

[0011] In some embodiments, the calibration liquid circulation pipeline has at least three sets;

[0012] The cleaning circulation pipelines include at least three sets, including a water washing circulation pipeline, an alcohol washing circulation pipeline and an air washing circulation pipeline.

[0013] In some embodiments, a locking device is further included, and the locking device is used to lock the measuring part when it is connected to one of the calibration liquid circulation pipeline and the cleaning circulation pipeline.

[0014] In some embodiments, the calibration liquid circulation pipeline and the cleaning circulation pipeline respectively have a first circulation interface and a second circulation interface, a plurality of the first circulation interfaces are arranged horizontally, a plurality of the second circulation interfaces are arranged horizontally, the measuring part is located between the first circulation interface and the second circulation interface in the vertical direction, and the measuring part has a first measuring interface and a second measuring interface;

[0015] The moving device comprises a horizontal moving mechanism and a vertical moving mechanism;

[0016] The horizontal movement mechanism is used to drive the measuring part to move horizontally, so as to move to a position corresponding to the first circulation interface and the second circulation interface of one of the calibration liquid circulation pipeline and the cleaning circulation pipeline;

[0017] The vertical moving mechanism is used to drive the measuring part to move in the vertical direction so that the second circulation interface and the second measuring interface are docked, and then the locking device locks the first circulation interface and the first measuring interface, as well as the second circulation interface and the second measuring interface.

[0018] In some embodiments, the locking device includes a first locking mechanism, a second locking mechanism, and a third locking mechanism, and the first circulation interface, the second circulation interface, the first measurement interface, and the second measurement interface are respectively installed with flange quick connectors;

[0019] The first locking mechanism includes a first driving mechanism, and the first driving mechanism is used to move the flange quick connector on the first circulation interface toward the first measurement interface and dock with the flange quick connector of the first measurement interface;

[0020] The second locking mechanism includes a second driving mechanism and a first flange quick clamping fixture, and the second driving mechanism is used to drive the first flange quick clamping fixture to press the flange quick connector on the first circulation interface and the flange quick connector on the first measurement interface up and down;

[0021] The third locking mechanism includes a third driving mechanism and a second flange quick clamping fixture, and the third driving mechanism is used to drive the second flange quick clamping fixture to press the flange quick connector on the second circulation interface and the flange quick connector on the second measurement interface up and down;

[0022] The first locking mechanism is arranged on the circulation part; the second locking mechanism and the third locking mechanism are arranged on the measuring part and can move with the measuring part.

[0023] In some embodiments, the measuring part includes three parallel density meter installation positions, and one end of each of the density meter installation positions is respectively provided with a stop valve K1, a stop valve K2 and a stop valve K3, and the other end is respectively provided with a stop valve K4, a stop valve K5 and a stop valve K6. After the stop valve K1, the stop valve K2 and the stop valve K3 are combined into one way, a thermometer W1 is provided between them and the first measurement interface, and after the stop valve K4, the stop valve K5 and the stop valve K6 are combined into one way, a thermometer W2 is provided between them and the second measurement interface.

[0024] In some embodiments, the calibration liquid circulation pipeline includes the first circulation interface, the first pressure regulating valve, the first heat exchange end of the first heat exchanger, the first stop valve, the constant temperature bath, the second stop valve, the second heat exchange end of the first heat exchanger, the pump, the flow meter, the second pressure regulating valve, the pressure gauge and the second circulation interface which are connected in sequence; a first branch is connected between the first circulation interface and the first pressure regulating valve, and the first branch includes a first manual stop valve and a standard density meter; a second branch is connected between the pump and the flow meter, and the second branch is connected to a drain outlet through a second manual stop valve; a third branch is connected between the second circulation interface and the pressure gauge, and the third branch includes a pressure pump.

[0025] In some embodiments, the water washing circulation pipeline includes the first circulation interface, the pressure regulating valve T4, the water tank S1, the pump P2, the pressure regulating valve T3 and the second circulation interface connected in sequence; a fourth branch is connected between the pump P2 and the pressure regulating valve T3, and the fourth branch is connected to the drain through the manual stop valve E3;

[0026] The alcohol washing circulation pipeline includes the first circulation interface, the pressure regulating valve T8, the alcohol tank S2, the pump P4, the pressure regulating valve T7 and the second circulation interface connected in sequence; a fifth branch is also provided between the pump P4 and the pressure regulating valve T7, and the fifth branch is connected to the drain outlet through the manual stop valve E6;

[0027] The air washing circulation pipeline includes the first circulation interface, the pressure regulating valve T9, the air pump Q1, the exhaust port and the second circulation interface which are connected in sequence.

[0028] In some embodiments, the calibration liquid circulation pipeline, the water washing circulation pipeline and the alcohol washing circulation pipeline are all connected to the air washing circulation pipeline, so as to blow and clean the residual liquid in the pipeline;

[0029] The calibration liquid circulation pipeline, the water washing circulation pipeline and the alcohol washing circulation pipeline are respectively connected to the air washing circulation pipeline through three-way stop valves, and the three-way stop valve is also connected to the exhaust valve.

[0030] In some embodiments, the online vibrating tube liquid density meter calibration device further includes a PID control system for automatically controlling the online vibrating tube liquid density meter calibration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an online vibrating tube liquid density meter calibration device of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the online vibrating tube liquid density meter calibration device of the present invention (part of the cabinet structure is hidden);

[0033] Figure 3 It is a schematic diagram of the structure of the measuring part, a part of the circulation part, the moving device and the locking device of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the measuring part of the present invention;

[0035] Figure 5 It is a schematic diagram of the structure of the measuring part, a part of the circulation part and the locking device of the present invention;

[0036] Figure 6 It is a schematic diagram of the principle of the measuring part and the calibration liquid circulation pipeline of the present invention;

[0037] Figure 7 It is a schematic diagram of the principle of the water washing circulation pipeline of the present invention;

[0038] Figure 8It is a schematic diagram of the principle of the calibration liquid secondary circulation pipeline of the present invention;

[0039] Fig. 9 It is a schematic diagram of the principle of the alcohol washing circulation pipeline of the present invention;

[0040] Fig.10 It is a schematic diagram of the principle of the air washing circulation pipeline of the present invention;

[0041] Fig.11 It is a schematic diagram of the principle of the calibration liquid three-circulation pipeline of the present invention;

[0042] Reference numerals:

[0043] Cabinet 1;

[0044] Measuring part 2; first measuring interface B11; second measuring interface B21;

[0045] Circulation part 3; first circulation interface B10; second circulation interface B20; calibration liquid first circulation pipeline 31; water washing circulation pipeline 32; calibration liquid second circulation pipeline 33; alcohol washing circulation pipeline 34; air washing circulation pipeline 35; calibration liquid third circulation pipeline 36; hose 37;

[0046] Moving device 4; horizontal moving mechanism 41; horizontal track 411; horizontal driving device 412; horizontal moving bracket 413; vertical moving mechanism 42; vertical track 421; vertical driving device 422; vertical moving bracket 423;

[0047] The first locking mechanism 51; the first driving mechanism 511; the elastic buffer mechanism 512; the second locking mechanism 52; the second driving mechanism 521; the first flange quick clamping fixture 522; the third locking mechanism 53; the third driving mechanism 531; the second flange quick clamping fixture 532;

[0048] Operation table 6. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0054] The present invention provides an online vibrating tube liquid density meter calibration device for calibrating an online vibrating tube liquid density meter. Specifically, the present invention provides an online vibrating tube liquid density meter calibration device designed according to the JJG 370-2019 "Online Vibrating Tube Liquid Densitometer" verification procedure and using the principle of a density meter method standard device for the verification of an online vibrating tube liquid density meter.

[0055] See also Figure 1-2 The online vibrating tube liquid density meter calibration device comprises a cabinet 1, a measuring part 2, a circulation part 3, a moving device 4, a locking device and a control system. The measuring part 2 and the moving device 4 are arranged in the cabinet 1, and a part of the circulation part 3 is arranged in the cabinet 1 and a part is arranged outside the cabinet 1.

[0056] See also Figure 3 The measuring part 2 is used to install the measured density meter, and the standard density meter can also be installed at the same time. The circulation part 3 includes multiple sets of calibration liquid circulation pipes and at least one set of cleaning circulation pipes. The moving device 4 is used to move the measuring part 2 between the calibration liquid circulation pipe and the cleaning circulation pipe to connect to one of the calibration liquid circulation pipe and the cleaning circulation pipe. The locking device is used to lock the measuring part 2 when it is connected to the calibration liquid circulation pipe and the cleaning circulation pipe respectively, so that the pipes can be connected smoothly. The purpose of this arrangement is that when the measured density meter is calibrated with multiple different solvents, by injecting a solvent into each set of calibration liquid circulation pipes, and injecting different solvents into multiple sets of calibration liquid circulation pipes respectively, when the measured density meter is switched between different calibration liquid circulation pipes for calibration, there is no need to replace the solvent in the calibration liquid circulation pipe (or reduce the number of replacements), and after replacing a new measured density meter, there is no need to replace the solvent in the calibration liquid circulation pipe (or reduce the number of replacements), so that the time required for cleaning the pipe and the instrument is saved, which can greatly improve the calibration efficiency and meet the large-scale calibration needs of the density meter, and also reduce the impact caused by unclean cleaning pipes.

[0057] In this embodiment, three sets of calibration liquid circulation pipes are provided to support calibration of the density meter using three different solutions. In other implementations, there may be two or more sets of calibration liquid circulation pipes to meet the calibration requirements of the density meter in different situations.

[0058] The cleaning circulation pipeline is used to clean the measuring part 2. In this embodiment, there are three sets of cleaning circulation pipelines, including a water washing circulation pipeline 32, an alcohol washing circulation pipeline 34 and an air washing circulation pipeline 35. In other embodiments, one, two or more sets of cleaning circulation pipelines can also be provided. The type of cleaning circulation pipeline can be provided as needed, and can be a combination of a water washing circulation pipeline 32, an alcohol washing circulation pipeline 34 and an air washing circulation pipeline 35, or other types of cleaning circulation pipelines, which are not limited here. In this embodiment, by arranging two sets of liquid cleaning pipelines, it is supported to clean the measuring part 2 with two cleaning liquids, and by arranging a set of gas cleaning pipelines, it is supported to clean the measuring part 2 with water-free and oil-free air.

[0059] See also Figure 3In this embodiment, each set of the calibration liquid circulation pipeline and the cleaning circulation pipeline has a first circulation interface B10 and a second circulation interface B20, respectively, for docking with the measuring part 2, multiple first circulation interfaces B10 are arranged horizontally, multiple second circulation interfaces B20 are arranged horizontally, and the measuring part 2 is located between the first circulation interface B10 and the second circulation interface B20 in the vertical direction. The measuring part 2 has a first measurement interface B11 and a second measurement interface B21, which are used to dock with the circulation part 3, wherein the first measurement interface B11 is docked with the first circulation interface B10, and the second measurement interface B21 is docked with the second circulation interface B20.

[0060] The structure and working principle of the online vibrating tube liquid density meter calibration device in this embodiment are described in detail below.

[0061]

Mobile device 4

[0062] See also Figure 3 The moving device 4 includes a horizontal moving mechanism 41 and a vertical moving mechanism 42. The horizontal moving mechanism 41 is used to drive the measuring part 2 to move horizontally, so as to move to a position corresponding to the first circulation interface B10 and the second circulation interface B20 of one of the calibration liquid circulation pipeline and the cleaning circulation pipeline. The vertical moving mechanism 42 is used to drive the measuring part 2 to move in the vertical direction, so that the second circulation interface B20 is docked with the second measurement interface B21, and then the locking device locks the first circulation interface B10 and the first measurement interface B11, as well as the second circulation interface B20 and the second measurement interface B21. In other embodiments, the arrangement of the first circulation interface B10 and the second circulation interface B20, the setting position and movement mode of the measuring part 2, and the movement direction of the moving device 4 may also be different from the above, as long as the movement of the measuring part 2 can be realized, so as to dock with different calibration liquid circulation pipelines and cleaning circulation pipelines to realize calibration and cleaning.

[0063] Specifically, in this embodiment, the horizontal moving mechanism 41 includes a horizontal track 411, a horizontal driving device 412 and a horizontal moving bracket 413, and the vertical moving mechanism 42 includes a vertical track 421, a vertical driving device 422 and a vertical moving bracket 423, wherein the horizontal moving bracket 413 is slidably arranged on the horizontal track 411, and is driven by the horizontal driving device 412 to realize movement on the horizontal track 411. The vertical track 421 is fixedly arranged on the horizontal moving bracket 413, and the vertical moving bracket 423 is slidably arranged on the vertical track 421, and is driven by the vertical driving device 422 to realize movement on the vertical track 421. The measuring part 2 is fixedly mounted on the vertical bracket. The horizontal driving device 412 and the vertical driving device 422 can use motors.

[0064] In this embodiment, the first circulation interface B10 and the first measurement interface B11 are located above the second circulation interface B20 and the second measurement interface B21. In other embodiments, the second circulation interface B20 and the second measurement interface B21 may be located below the first circulation interface B10 and the first measurement interface B11. The first circulation interface B10, the second circulation interface B20, the first measurement interface B11 and the second measurement interface B21 are respectively installed with flange quick connectors for quick connection.

[0065]

Locking device

[0066] See also Figure 5 The locking device includes a first locking mechanism 51, a second locking mechanism 52 and a third locking mechanism 53.

[0067] The first locking mechanism 51 is arranged on the circulation part 3, specifically on the first circulation interface B10, and includes a first driving mechanism 511 and an elastic buffer mechanism 512. The first driving mechanism 511 is used to move the flange quick connector on the first circulation interface B10 toward the first measuring interface B11 (specifically, move downward) and dock with the flange quick connector of the first measuring interface B11. The elastic buffer mechanism 512 is arranged between the output shaft of the first driving mechanism 511 and the flange quick connector of the first circulation interface B10 for buffering. The pipe connected to the rear of the first circulation interface B10 is a hose 37, thereby allowing the first circulation interface B10 to move downward.

[0068] The second locking mechanism 52 and the third locking mechanism 53 are disposed on the measuring part 2 and can move with the measuring part 2 .

[0069] The second locking mechanism 52 is arranged on the first measuring interface B11, and the second locking mechanism 52 includes a second driving mechanism 521 and a first flange quick clamping fixture 522. The second driving mechanism 521 is used to drive the first flange quick clamping fixture 522 to press the flange quick connector on the first circulation interface B10 and the flange quick connector on the first measuring interface B11 up and down. Specifically, the second driving mechanism 521 is located below the first circulation interface B10, and when its output shaft moves upward, it can drive the hook claws on the first flange quick clamping fixture 522 to close inward, thereby clamping the flange quick connector on the first circulation interface B10 and the flange quick connector on the first measuring interface B11, so that the measuring part 2 is connected with the circulation part 3, so as to calibrate or clean the density meter. When the output shaft of the second driving mechanism 521 moves downward, the hooks on the first flange quick clamping fixture 522 are driven to open outward, thereby loosening the flange quick connector on the first circulation interface B10 and the flange quick connector on the first measuring interface B11, so that the measuring part 2 is disengaged from the circulation part 3, so as to facilitate the movement of the measuring part 2.

[0070] The third locking mechanism 53 is arranged on the second measuring interface B21, and the third locking mechanism 53 includes a third driving mechanism 531 and a second flange quick clamping fixture 532. The third driving mechanism 531 is used to drive the second flange quick clamping fixture 532 to press the flange quick connector on the second circulation interface B20 and the flange quick connector on the second measuring interface B21 up and down. Specifically, the third driving mechanism 531 is located above the second circulation interface B20, and when its output shaft moves downward, it can drive the hook claws on the second flange quick clamping fixture 532 to close inward, thereby clamping the flange quick connector on the second circulation interface B20 and the flange quick connector on the second measuring interface B21, so that the measuring part 2 is connected with the circulation part 3, so as to calibrate or clean the density meter. When the output shaft of the third driving mechanism 531 moves upward, the hooks on the second flange quick clamping fixture 532 are driven to open outward, thereby loosening the flange quick connector on the second circulation interface B20 and the flange quick connector on the second measuring interface B21, so that the measuring part 2 is disengaged from the circulation part 3, so as to facilitate the movement of the measuring part 2.

[0071] The working process of the moving device 4 and the locking device is as follows:

[0072] The measuring part 2 has two height positions in the vertical direction: a default height and a working height. The default height is higher than the working height. In the non-working state, the measuring part 2 is at the default height. At this time, the first measuring interface B11 and the first circulation interface B10, as well as the second measuring interface B21 and the second circulation interface B20 are all at a distance in the vertical direction, and the two are not docked, thereby allowing the measuring part 2 to move horizontally without interfering with other structures. When it is necessary to work, the measuring part 2 slides in the horizontal direction. When the measuring part 2 slides in the horizontal direction to one of the calibration liquid circulation pipeline and the cleaning circulation pipeline that need to be docked under the drive of the horizontal moving mechanism 41, the measuring part 2 then moves downward under the drive of the vertical moving mechanism 42, from the default height to the working height, so that the second measuring interface B21 below moves to the position docking with the second circulation interface B20. At this time, the third driving mechanism 531 is started, and the second measuring interface B21 is moved to the second circulation interface B20 and locked through the second flange quick clamping fixture 532. At the same time, since the first measuring interface B11 moves downward with the measuring part 2, it is farther away from the first circulation interface B10. By starting the first driving mechanism 511, the first circulation interface B10 is driven to move downward to a position where it docks with the first measuring interface B11, and then the first circulation interface B10 and the first measuring interface B11 are locked by the first flange quick clamping tool 522.

[0073] When the measuring part 2 needs to be cleaned or moved to another calibration liquid circulation pipeline, the first flange quick clamping fixture 522 and the second flange quick clamping fixture 532 are first loosened, and the first driving mechanism 511 is started to drive the first circulation interface B10 to move upward and reset. Then the measuring part 2 moves upward from the working height to the default height. At the default height, it moves horizontally to the cleaning circulation pipeline or calibration liquid circulation pipeline that needs to be docked, and then the above process is repeated to dock with the cleaning circulation pipeline or calibration liquid circulation pipeline and lock it.

[0074] In other embodiments, the moving device 4 and the locking device can also be implemented in other ways. For example, contrary to the above setting, the working height of the measuring part 2 is set to be higher than the default height, and the measuring part 2 moves upward so that the first measuring interface B11 and the first circulation interface B10 are docked first, and the second circulation interface B20 is docked with the second measuring interface B21 by moving upward. There is no restriction on the movement and locking method of the measuring part 2, as long as the movement and locking of the measuring part 2 can be achieved.

[0075] In this embodiment, the first driving mechanism 511, the second driving mechanism 521 and the third driving mechanism 531 are specifically electric push rods.

[0076]

Measurement part 2

[0077] See also Figure 4 and Figure 6 The measuring part 2 includes at least two parallel density meter installation positions, which can be used to install the density meter to be measured, or can be used to install a calibrated density meter or flow meter as a standard instrument for reference, so as to facilitate data analysis. Specifically in this embodiment, the measuring part 2 includes three parallel density meter installation positions, which can simultaneously install three density meters to be measured, or install two density meters to be measured and a standard density meter as a reference, and can calibrate 1-2 density meters to be measured at the same time, avoiding the repeated installation and disassembly process and improving the calibration efficiency.

[0078] Specifically, see Figure 6 One end of each density meter installation position is respectively provided with a stop valve K1, a stop valve K2 and a stop valve K3, and the other end is respectively provided with a stop valve K4, a stop valve K5 and a stop valve K6. After the stop valve K1, the stop valve K2 and the stop valve K3 are combined into one, a thermometer W1 is provided between the first measuring interface B11, and after the stop valve K4, the stop valve K5 and the stop valve K6 are combined into one, a thermometer W2 is provided between the second measuring interface B21.

[0079]

Calibration liquid circulation pipeline

[0080] See also Figure 6 , Figure 8 and Fig.11 In this embodiment, each set of calibration liquid circulation pipelines adopts the same design, and the three sets of calibration liquid circulation pipelines are calibration liquid circulation pipeline 1 31, calibration liquid circulation pipeline 2 33 and calibration liquid circulation pipeline 36. Specifically, each set of calibration liquid circulation pipelines includes a first circulation interface B10, a first pressure regulating valve (pressure regulating valve T2, pressure regulating valve T6, pressure regulating valve T11), a first heat exchange end of a first heat exchanger (heat exchanger R1, heat exchanger R2, heat exchanger R3), a first stop valve (stop valve K12, stop valve K13, stop valve K14), a thermostatic bath H1, a second stop valve (stop valve K15, stop valve K16, stop valve K17), a second heat exchange end of a first heat exchanger (heat exchanger R1, heat exchanger R2, heat exchanger R3), a pump (pump P1, pump P3, pump P5), a flow meter (flow meter M1, flow meter M2, flow meter M3), a second pressure regulating valve ( Pressure regulating valve T1, pressure regulating valve T5, pressure regulating valve T10), pressure gauges (pressure gauge U1, pressure gauge U2, pressure gauge U3) and second circulation interface B20; a first branch is connected between the first circulation interface B10 and the first pressure regulating valve, the first branch includes a first manual stop valve (manual stop valve E1, manual stop valve E4, manual stop valve E7) and a standard density meter, the standard density meter can be a desktop density meter; a second branch is connected between the pump and the flow meter, the second branch is connected to the drain outlet through a second manual stop valve (manual stop valve E2, manual stop valve E5, manual stop valve E8); a third branch is connected between the second circulation interface B20 and the pressure gauge, the third branch includes a booster pump C1. Although not shown in the figure in this embodiment, it is preferred that a booster pump is provided for each calibration liquid circulation pipeline, and a booster pump can be provided for each calibration liquid circulation pipeline separately, or three calibration liquid circulation pipelines can share one booster pump.

[0081] The first pressure regulating valves are respectively pressure regulating valve T2, pressure regulating valve T6 and pressure regulating valve T11 in the calibration liquid circulation pipeline 1 31, the calibration liquid circulation pipeline 2 33 and the calibration liquid circulation pipeline 36. The first heat exchangers are respectively heat exchanger R1, heat exchanger R2 and heat exchanger R3 in the calibration liquid circulation pipeline 1 31, the calibration liquid circulation pipeline 2 33 and the calibration liquid circulation pipeline 36. The first stop valves are respectively The calibration liquid three circulation pipeline 36 is respectively provided with stop valve K12, stop valve K13 and stop valve K14. The second stop valve pump is respectively provided with stop valve K15, stop valve K16 and stop valve K17 in the calibration liquid one circulation pipeline 31, the calibration liquid two circulation pipeline 33 and the calibration liquid three circulation pipeline 36. The calibration liquid one circulation pipeline 31, the calibration liquid two circulation pipeline 33 and the calibration liquid three circulation pipeline 36 are respectively provided with pump P1, pump P3 and pump P5. The flow meter is in the calibration liquid one circulation pipeline 31, the calibration liquid two circulation pipeline 33 and the calibration liquid three circulation pipeline 36. The first calibration liquid circulation pipeline 31, the second calibration liquid circulation pipeline 33 and the third calibration liquid circulation pipeline 36 are flow meters M1, M2 and M3 respectively; the second pressure regulating valves are pressure regulating valves T1, T5 and T10 respectively in the first calibration liquid circulation pipeline 31, the second calibration liquid circulation pipeline 33 and the third calibration liquid circulation pipeline 36; the pressure gauges are pressure gauges U1, U2 and U3 respectively in the first calibration liquid circulation pipeline 31, the second calibration liquid circulation pipeline 33 and the third calibration liquid circulation pipeline 36; the first manual stop valves are manual stop valves E1, E4 and E7 in the first calibration liquid circulation pipeline 31, the second calibration liquid circulation pipeline 33 and the third calibration liquid circulation pipeline 36; the second manual stop valves are manual stop valves E2, E5 and E8 in the first calibration liquid circulation pipeline 31, the second calibration liquid circulation pipeline 33 and the third calibration liquid circulation pipeline 36.

[0082] The first driving mechanism 511 is respectively an electric push rod G1 , an electric push rod G3 , and an electric push rod G6 in the calibration liquid first circulation pipeline 31 , the calibration liquid second circulation pipeline 33 , and the calibration liquid third circulation pipeline 36 .

[0083]

Cleaning circulation pipe

[0084] See also Figure 7 The water washing circulation pipeline 32 includes a first circulation interface B10, a pressure regulating valve T4, a water tank S1, a pump P2, a pressure regulating valve T3 and a second circulation interface B20 which are connected in sequence; a fourth branch is connected between the pump P2 and the pressure regulating valve T3, and the fourth branch is connected to the drain outlet through a manual stop valve E3;

[0085] See also Fig. 9The alcohol washing circulation pipeline 34 includes a first circulation interface B10, a pressure regulating valve T8, an alcohol tank S2, a pump P4, a pressure regulating valve T7 and a second circulation interface B20 which are connected in sequence; a fifth branch is also provided between the pump P4 and the pressure regulating valve T7, and the fifth branch is connected to the drain port through a manual stop valve E6;

[0086] See also Fig.10 The air washing circulation pipeline 35 includes a first circulation interface B10, a pressure regulating valve T9, an air pump Q1, an exhaust port and a second circulation interface B20 which are connected in sequence.

[0087] The first driving mechanism 511 is respectively an electric push rod G2, an electric push rod G4, and an electric push rod G5 in the water washing circulation pipeline 32, the alcohol washing circulation pipeline 34, and the air washing circulation pipeline 35.

[0088] In this embodiment, the three sets of calibration liquid circulation pipelines, the water washing circulation pipeline 32 and the alcohol washing circulation pipeline 34 are all connected to the air washing circulation pipeline 35, so as to blow and clean the residual liquid in the pipeline. Figure 6-11 The dotted line at the top in the figure represents the connection pipelines between the calibration liquid circulation pipeline, the water washing circulation pipeline 32, the alcohol washing circulation pipeline 34 and the air washing circulation pipeline 35. The calibration liquid circulation pipeline, the water washing circulation pipeline 32 and the alcohol washing circulation pipeline 34 are respectively connected to the air washing circulation pipeline 35 through three-way stop valves, and the three-way stop valve is also connected to the exhaust valve.

[0089] Specifically, in the calibration liquid first circulation pipeline 31, the first port of the three-way stop valve K7 is connected between the first circulation interface B10 and the pressure regulating valve T2, the second port of the three-way stop valve K7 is connected to the exhaust valve D1, and the third port is connected between the air pump Q1 and the pressure regulating valve T9 of the air washing circulation pipeline 35. In the water washing circulation pipeline 35, the first port of the three-way stop valve K8 is connected between the first circulation interface B10 and the pressure regulating valve T4, the second port of the three-way stop valve K8 is connected to the exhaust valve D2, and the third port is connected between the air pump Q1 and the pressure regulating valve T9 of the air washing circulation channel 35. In the calibration liquid second circulation pipeline 33, the first port of the three-way stop valve K9 is connected between the first circulation interface B10 and the pressure regulating valve T6, the second port of the three-way stop valve K9 is connected to the exhaust valve D3, and the third port is connected between the air pump Q1 and the pressure regulating valve T9 of the air washing circulation pipeline 35. In the alcohol washing circulation pipeline 34, the first port of the three-way stop valve K10 is connected between the first circulation interface B10 and the pressure regulating valve T8, the second port of the three-way stop valve K10 is connected to the exhaust valve D4, and the third port is connected between the air pump Q1 and the pressure regulating valve T9 of the air washing circulation pipeline 35. In the calibration liquid three-circulation pipeline 36, the first port of the three-way stop valve K11 is connected between the first circulation interface B10 and the pressure regulating valve T11, the second port of the three-way stop valve K11 is connected to the exhaust valve D5, and the third port is connected between the air pump Q1 and the pressure regulating valve T9 of the air washing circulation pipeline 35.

[0090] [Other preferred settings]

[0091] Material: All parts in contact with liquid are made of corrosion-resistant 316L stainless steel. For external pipes, corrosion-resistant 316 stainless steel corrugated braided pipes are widely used to connect them to facilitate pipe connection.

[0092] Pipeline sealing: All joints are sealed with flexible methods, such as quick-release joints, flange joints, screw threads, etc. At the installation position of the density meter, a stainless steel corrugated compensation pipe is used for connection, and the installation part is connected with two different specifications of joints (flange or other) to facilitate adjustment of the fixed density meter flange position and compatibility with different models of density meters.

[0093] Insulation: The inner wall of cabinet 1, the outside of the pipeline, valves, flow meters, pressure gauges, pumps, etc. are all covered with nitrile rubber insulation cotton with aluminum foil for insulation to reduce heat exchange between the device and the outside air and reduce the impact of temperature changes during the calibration process.

[0094] Heating / cooling method of calibration liquid: The temperature control of pipeline liquid is realized by the heat source generated by the heating / cooling of the thermostatic bath. The specific process is that the host computer sets the temperature and other parameters and sends the control command to the thermostatic bath. The thermostatic bath is heated / cooled according to the set parameters. Through the external circulation system of the thermostatic bath, the liquid in the thermostatic bath passes through the heat exchanger to heat / cool the liquid in the circulation pipe.

[0095] Cabinet 1: It adopts the form of double doors to increase the cabinet door opening space, which is convenient for installing the density meter. The front part and the door are equipped with windows to facilitate observation of the working status of the density meter in the device.

[0096]

Control system

[0097] In this embodiment, the control system adopts a PID control system, so as to automatically control all the electronically controlled valves and instruments in the online vibrating tube liquid density meter calibration device, thereby automatically controlling pipeline switching, pipeline cleaning, state control (temperature, pressure, flow, etc.), and automatic reading and storage of instruments. The control system is also provided with an operating table 6, which includes an interactive input device. The operating table 6 can adopt a movable cantilever structure, which is convenient for setting parameters by comparing the state of the density meter.

[0098] The online vibrating tube liquid density meter calibration device of the present invention can realize the following functions:

[0099] Automatic temperature reading: high-precision imported temperature probe is used. The temperature probe directly contacts the liquid in the pipe. Through the temperature measurement component, the data is directly input to the host computer, and the host computer is used to read the temperature. The temperature measurement accuracy is ±0.02℃ and the resolution is 0.001℃, which is much higher than the requirements specified in the regulations.

[0100] Constant temperature bath status control: such as controlling the switch status of the constant temperature bath, setting the temperature, setting the flow rate, etc. through the PID part of the host computer.

[0101] Pressure calibration: Control the liquid pressure in the pipeline through a pressurizing device such as a pump to create a calibration environment for the density meter pressure calibration. The pressure gauge has an accuracy level of 0.05 and a pressure range of 0-3MPa.

[0102] Flow measurement: A flow meter is built into the pipeline to detect flow in the pipeline;.

[0103] Standard density reading: The secondary reference Micro Motion online densitometer is used as the standard densitometer, which is installed in the density meter installation position of the measurement part 2. The reading is directly read through the host computer, including the temperature, density, vibration frequency and other information of the standard densitometer.

[0104] Automatic control of the calibration process: The calibration PID program is pre-installed on the host computer. When in use, after modifying the parameters, the density meter calibration automatic program can be directly called.

[0105] Automatic cleaning control: Through the host computer control program, after the measuring part 2 switches to the cleaning circulation pipeline, it automatically cleans according to the set parameters.

[0106] Upper computer working status display: Through the upper computer operating software, the operating status of each part of the online vibrating tube liquid density meter calibration device is directly monitored, including temperature, pressure, standard table parameters, flow rate, etc.

[0107] Others: Such as the treatment of bubbles in the pipeline, automatic pipeline switching, pipeline drying, and the design of liquid collection methods for desktop density meters.

[0108]

Operation process

[0109] The general operation process of the online vibrating tube liquid density meter calibration device of the present invention is as follows:

[0110] Preparatory work: Install the density meter to be measured, clean the measuring part 2 with the alcohol washing circulation pipe 34, and blow and purify the measuring part 2 with the air washing circulation pipe 35.

[0111] Detection work: the measuring part 2 is connected to the calibration liquid for circulation one, the medium one is injected for detection, the medium is recovered after the detection is completed, and then it is moved to the cleaning circulation pipeline to clean the measuring part 2; after cleaning, the measuring part 2 is moved to the calibration liquid for circulation two, the medium two is injected for detection, the medium is recovered after the detection is completed, and then it is moved to the cleaning circulation pipeline to clean the measuring part 2; after cleaning, it is moved to the calibration liquid for circulation three, the medium three is injected for detection, the medium is recovered after the detection is completed, and then it is moved to the cleaning circulation pipeline for cleaning.

[0112] The specific operation process of the online vibrating tube liquid density meter calibration device of the present invention is as follows:

[0113] Step 1: Initial state setting

[0114] The initial state is the system default setting state, which is set during the program debugging phase. Any subsequent operation commands are set based on the initial state.

[0115] Default state of the motion guide rail: In the default state, the measuring part 2 is at the default height, in which the first flange quick clamping fixture 522 and the second flange quick clamping fixture 532 remain in a loose state. Control process: On the premise of confirming that there is no liquid in the pipeline, keep the first flange quick clamping fixture 522 and the second flange quick clamping fixture 532 in a completely loose state, and control the measuring part 2 to move to the position of the alcohol washing circulation pipeline 34. The specific data is determined according to the debugging effect.

[0116] Initial state of measuring part 2: stop valves K1 to K6 remain closed.

[0117] Initial state of circulation part 3 (degassing and washing circulation pipeline 35): Take the calibration liquid circulation pipeline 31 as an example, and the other circulation pipelines have the same logic. In the default state, pump P1 stops working, pressure regulating valves T1 and T2 remain closed, stop valves K7, K12 and K15 remain closed, and the electric push rod G1 on the pipeline shrinks its stroke.

[0118] The initial state of the air washing circulation pipeline 35 is as follows: the pressure regulating valve T9 remains closed, and the electric push rod G5 on the pipeline contracts its stroke.

[0119] Step 2: Installation of the Density Meter

[0120] The density meter A1 to be measured, the standard density meter A2, and the density meter A3 to be measured are respectively installed at the density meter installation position of the measuring part 2.

[0121] Step 3: Pipeline switching and positioning

[0122] The measuring part 2 moves to a designated position and cooperates with one of the calibration liquid circulation pipeline and the cleaning circulation pipeline (hereinafter referred to as the circulation / cleaning pipeline) to realize the pipeline switching function.

[0123] (1) Pipeline switching process

[0124] ① Preparation before pipeline switching: The process of switching the measuring part 2 from one circulation / cleaning pipeline to another: the corresponding pumps P1~P5 on the pipeline stop working, open the corresponding stop valves K7~K11 on the pipeline for ventilation, and after a certain period of time, confirm that the liquid in the outlet pipeline has been discharged, and close the corresponding pressure regulating valves T2, T4, T6, T8, and T11 on the pipeline. Confirm that the liquid level in the pipeline is pressed below the second measuring interface B21 at the bottom of the measuring part 2, close the corresponding pressure regulating valves T1, T3, T5, T7, and T10 on the pipeline, and close the stop valves K7~K11. Let it stand for a period of time (such as 1 minute), the first flange quick clamping fixture 522 is loosened, the electric push rods G1~G6 on the pipeline shrink their stroke (about 100mm), the stop valves K1~K6 are closed, and the second flange quick clamping fixture 532 is loosened.

[0125] ② Pipeline switching mode: The measuring part 2 moves upward to the default height, then moves horizontally to the stroke position corresponding to the specified pipeline, and then the measuring part 2 moves downward to the working height, the second measuring interface B21 cooperates with the second circulation interface B20 at the bottom of the circulation / cleaning pipeline, and the second flange quick clamping fixture 532 is clamped. The electric push rod G1~G6 ejects the stroke (about 100mm), so that the first measuring interface B11 at the top of the measuring part 2 cooperates with the first circulation interface B10 at the top of the circulation / cleaning pipeline, and the first flange quick clamping fixture 522 is clamped, and the pipeline switching is completed.

[0126] (2) Handling of special situations

[0127] ① Abnormal power failure processing plan: The control system has a state recording function to maintain the current state. Avoid disconnection of pipeline connections and leakage of liquid in the pipeline in the event of a sudden power failure;

[0128] ②Normal shutdown solution: Before shutdown, a pop-up window will appear on the display asking "Do you need to clean the instrument?" If you select "Yes," you can choose the cleaning method "Water wash," "Alcohol wash," or "Air wash." After the selection is completed, the cleaning will be automatically completed according to the relevant process, and then the measurement part 2 will return to the "default state." If you select "No," the measurement part 2 will directly return to the "default state."

[0129] ③ Treatment of bubbles in the pipeline liquid: During the circulation of calibration liquid, if there are bubbles in the liquid in the pipeline, it will affect the calibration accuracy of the instrument. Therefore, before normal calibration, it is necessary to discharge the bubbles in the liquid in the pipeline. The specific solution is to discharge the bubbles in the liquid in the pipeline by pressurizing it.

[0130] In the corresponding calibration liquid circulation pipeline, keep pumps P1, P3, P5, and pressure regulating valves T1, T5, and T10 in the open state. First, adjust the pressure regulating valves T2, T6, and T11 to a smaller value, such as adjusting the pressure regulating valves T2, T6, and T11 to 80° (the pressure regulating valve / stop valve is fully open when it is opened at 0°, and fully closed when it is opened at 90°, or expressed in percentage. The pressure regulating valve is adjusted to 80° for this bubble discharge treatment, which is a tentative data and shall be subject to actual debugging), and then increase the pressure through the booster pump C1 to discharge the bubbles in the pipeline.

[0131] ④ Treatment method to reduce bubbles entering the constant temperature tank / alcohol tank / water tank: adjust the pressure regulating valves T2, T4, T6, T8, and T11 to a lower value. It is recommended to adjust them to 45°. The user can input the specific adjustment value by himself;

[0132] ⑤ Dry the residual liquid in the pipeline: After the calibration is completed, you need to manually open the manual stop valves E2, E3, E5, E6, and E8 on the corresponding pipeline to drain the liquid in the corresponding constant temperature tank / alcohol tank / water tank. Then click the "Circulation Pipe Drying" command in the corresponding pipeline on the operation interface.

[0133] A. First, "dry the water outlet pipe": close the pressure regulating valves T1, T3, T5, T7, and T10 on the corresponding pipes, open the pressure regulating valves T2, T4, T6, T8, and T11, set the ventilation time, open the stop valves K7 to K11 for ventilation, and after the time is up, close the pressure regulating valves T2, T4, T6, T8, and T11.

[0134] B. Then carry out "drying the water inlet pipe": after the corresponding water outlet pipe is dried, confirm that the pressure regulating valves T2, T4, T6, T8, and T11 have been closed, set the ventilation time, open the pressure regulating valves T1, T3, T5, T7, and T10, and after the time is up, close the stop valves K7~K11. At this point, the liquid in the pipe has been dried;

[0135] ⑥Flow regulation: used to adjust the liquid flow in the corresponding pipeline. By controlling the switch size of the pressure regulating valves T1, T3, T5, T7, and T10, the water inlet flow is controlled. By controlling the pressure regulating valves T2, T4, T6, T8, and T11, the water outlet flow is controlled. In normal use, it is recommended to give priority to controlling the switch size of the pressure regulating valves T2, T4, T6, T8, and T11 to control the liquid flow in the pipeline.

[0136] ⑦Retain the "Pause" function: After clicking "Pause", the host computer records the current status of all components, and the system cuts off the power to other control parts, leaving only the industrial computer part working normally. After the user clicks "Continue", the system is powered on normally, and all unfinished operations continue to be executed, and will not be handled as "abnormal power off".

[0137] If you select "Pause", the host computer program stops working, or the industrial computer is powered off, and then powered on again, the system will handle it as "abnormal power off".

[0138] Step 4: Circulation / Purge Control

[0139] (1) One cycle of calibration solution

[0140] The device is powered on, the thermostatic bath H1 is filled with (20L) calibration liquid (recommended liquid: deionized water), the stop valves K12 and K15 are opened, and the temperature is set to start preheating. The control interface selects to execute "calibration liquid one cycle":

[0141] ① The measuring part 2 is connected to the calibration liquid circulation pipeline 31 according to the above “pipeline switching process”;

[0142] ② The stop valves K1 to K6 of the pipeline connected to the density meter are opened;

[0143] ③The pressure regulating valves T1~T2 are opened;

[0144] ④Pump P1, flow meter M1, and pressure gauge U1 start working;

[0145] ⑤ Adjust the caliber of the pressure regulating valve T1 as needed to adjust the flow rate at the pipeline inlet; adjust the flow rate at the pipeline outlet by adjusting the caliber of the pressure regulating valve T2; set the collection time (optional); after the above data is debugged, it can be directly recorded and written into the recommended caliber program;

[0146] ⑥After the state is stable, the experimental data (relevant parameters of standard density meter A2, pressure gauge U1 data, thermometer W1~W2 data, flow meter M1 data, time) are automatically recorded;

[0147] ⑦Test completed;

[0148] The control principle of other calibration liquid circulation pipelines is the same;

[0149] (2) Water washing cycle

[0150] The device is powered on, and the water tank S1 is filled with (30L) deionized water. The control interface selects to execute the "water washing cycle":

[0151] ① The measuring part 2 is connected to the water washing circulation pipeline 32 according to the above “pipeline switching process”;

[0152] ② The stop valves K1 to K6 of the pipeline connected to the density meter are opened;

[0153] ③The pressure regulating valves T3~T4 are opened;

[0154] ④Pump P2 starts working;

[0155] ⑤ Adjust the caliber of the pressure regulating valve T3 as needed to adjust the flow rate at the pipeline inlet; adjust the flow rate at the pipeline outlet by adjusting the caliber of the pressure regulating valve T4; set the cleaning time (optional); after the debugging is completed, the above data can be directly recorded and written into the recommended caliber program;

[0156] ⑥After a certain period of time (determined by the cleaning effect), the test is completed;

[0157] ⑦The control principles of other cleaning cycles are the same.

[0158] (3) Air washing cycle

[0159] The device is powered on. The control interface selects to execute the "air washing cycle":

[0160] ① The measuring part 2 is connected to the air washing circulation pipeline 35 according to the above “pipeline switching process”;

[0161] ② The stop valves K1 to K6 of the pipeline connected to the density meter are opened;

[0162] ③The pressure regulating valve T9 is opened;

[0163] ⑤ Adjust the caliber of the pressure regulating valve T9 and the flow rate of the pipeline as needed; set the cleaning time (optional); after the debugging is completed, the above data can be directly recorded and written into the program of the recommended caliber;

[0164] ⑥After a certain period of time (determined by the cleaning effect), the test is completed and the pressure regulating valve T9 is closed.

[0165] Step 5: Stress Testing

[0166] The pressure test pipeline is set as three calibration liquid circulation pipelines, and the calibration liquid circulation pipeline 31 is preferred, using deionized water as the medium. Control process:

[0167] The device is powered on, the thermostatic bath H1 is filled with (20L) calibration liquid (recommended liquid: deionized water), the stop valves K12 and K15 are opened, and the temperature is set to start preheating. On the control interface, select "Pressure Test" and "Calibration Liquid One Cycle":

[0168] ① The measuring part 2 is connected to the calibration liquid circulation pipeline 31 according to the above “pipeline switching process”;

[0169] ② The stop valves K1 to K6 of the pipeline connected to the density meter are open (the stop valves on the pipeline of the standard density meter can be closed);

[0170] ③The pressure regulating valves T1~T2 are opened;

[0171] ④ The pressure pump C1 is turned on and extended by about 10 mm to free up a larger volume to hold the liquid;

[0172] ⑤ Pump P1 and pressure gauge U1 start working;

[0173] ⑥ According to the needs, adjust the size of the pressure regulating valve T1 and the flow rate at the pipeline inlet; adjust the size of the pressure regulating valve T2 and the flow rate at the pipeline outlet; after the debugging is completed, the above data can be directly recorded and written into the recommended caliber program;

[0174] ⑦ After the state stabilizes, close the stop valves K1~K3 (for the pipeline not connected to the density meter, the stop valve on the pipeline remains closed), and close the pressure regulating valve T1;

[0175] ⑧ Set the pressure. The booster pump C1 adjusts the pipeline volume compression according to the real-time pressure data fed back by the pressure gauge U1, slowly adjusts it to the set pressure value, and maintains the pressure for 5 minutes;

[0176] ⑨Test completed.

[0177] For the other two calibration liquid circulation pipelines, after confirming the medium, the test process is the same.

[0178] The online vibrating tube liquid density meter calibration device of the present invention is provided with multiple sets of calibration liquid circulation pipelines and moving devices. When the density meter to be measured is calibrated with multiple different solvents, a solvent is injected into each set of calibration liquid circulation pipelines, and multiple sets of calibration liquid circulation pipelines are respectively injected with different solvents. When the density meter to be measured is switched between different calibration liquid circulation pipelines for calibration, there is no need to replace the solvent in the calibration liquid circulation pipeline (or reduce the number of replacements). After replacing a new density meter to be measured, there is no need to replace the solvent in the calibration liquid circulation pipeline (or reduce the number of replacements). Therefore, the time required for cleaning the pipeline and the instrument is saved, which can greatly improve the calibration efficiency and meet the large-scale calibration needs of the density meter. At the same time, it also reduces the impact caused by unclean cleaning pipelines. Furthermore, the present invention greatly improves the calibration capability, efficiency and accuracy of the density meter through reasonable optimization, such as optimizing the pipeline structure, realizing automatic control, multi-standard meter calibration, etc.

[0179] The above are only some embodiments of the present invention. For those skilled in the art, without departing from the creative concept of the present invention, several modifications and improvements can be made, or the above technical solutions can be freely combined, including the technical features between the above different embodiments, which all belong to the protection scope of the present invention.

Claims

1. An online vibrating tube liquid density meter calibration device, characterized in that: It includes a measuring part, a circulation part and a moving device; The measuring part is used to install the density meter to be measured; The loop portion includes: A plurality of sets of calibration liquid circulation pipelines for testing the measuring part; and At least one set of cleaning circulation pipeline for cleaning the measuring part; The moving device is used to move the measuring part between the calibration liquid circulation pipeline and the cleaning circulation pipeline to connect to one of the calibration liquid circulation pipeline and the cleaning circulation pipeline; It also includes a locking device, which is used to lock the measuring part when it is connected to one of the calibration liquid circulation pipeline and the cleaning circulation pipeline; The calibration liquid circulation pipeline and the cleaning circulation pipeline respectively have a first circulation interface and a second circulation interface, a plurality of the first circulation interfaces are arranged horizontally, a plurality of the second circulation interfaces are arranged horizontally, the measuring part is located between the first circulation interface and the second circulation interface in the vertical direction, and the measuring part has a first measuring interface and a second measuring interface; The moving device comprises a horizontal moving mechanism and a vertical moving mechanism; The horizontal movement mechanism is used to drive the measuring part to move horizontally, so as to move to a position corresponding to the first circulation interface and the second circulation interface of one of the calibration liquid circulation pipeline and the cleaning circulation pipeline; The measuring part has a default height and a working height in the vertical direction. When the measuring part is at the default height, the first measuring interface and the first circulation interface, as well as the second measuring interface and the second circulation interface, are spaced apart in the vertical direction, and are not docked with each other. When the measuring part slides in the horizontal direction to one of the calibration liquid circulation pipeline and the cleaning circulation pipeline to be docked under the drive of the horizontal moving mechanism, the measuring part moves downward under the drive of the vertical moving mechanism from the default height to the working height, so that the second measuring interface below moves to a position docking with the second circulation interface, the second measuring interface is moved to be locked with the second circulation interface, the first circulation interface is driven to move downward to a position docking with the first measuring interface, and then the first circulation interface is locked with the first measuring interface. Alternatively, the measuring part moves upward so that the first measuring interface and the first circulation interface are docked first, and the second circulation interface completes docking with the second measuring interface by moving upward.

2. The online vibrating tube liquid density meter calibration device according to claim 1, characterized in that: The calibration liquid circulation pipelines include at least three sets; The cleaning circulation pipelines include at least three sets, including a water washing circulation pipeline, an alcohol washing circulation pipeline and an air washing circulation pipeline.

3. The online vibrating tube liquid density meter calibration device according to claim 1, characterized in that: The vertical moving mechanism is used to drive the measuring part to move in the vertical direction so that the second circulation interface and the second measuring interface are docked, and then the locking device locks the first circulation interface and the first measuring interface, as well as the second circulation interface and the second measuring interface.

4. The online vibrating tube liquid density meter calibration device according to claim 3, characterized in that: The locking device comprises a first locking mechanism, a second locking mechanism and a third locking mechanism, and the first circulation interface, the second circulation interface, the first measurement interface and the second measurement interface are respectively installed with flange quick connectors; The first locking mechanism includes a first driving mechanism, and the first driving mechanism is used to move the flange quick connector on the first circulation interface toward the first measurement interface and dock with the flange quick connector of the first measurement interface; The second locking mechanism includes a second driving mechanism and a first flange quick clamping fixture, and the second driving mechanism is used to drive the first flange quick clamping fixture to press the flange quick connector on the first circulation interface and the flange quick connector on the first measurement interface up and down; The third locking mechanism includes a third driving mechanism and a second flange quick clamping fixture, and the third driving mechanism is used to drive the second flange quick clamping fixture to press the flange quick connector on the second circulation interface and the flange quick connector on the second measurement interface up and down; The first locking mechanism is arranged on the circulation part; the second locking mechanism and the third locking mechanism are arranged on the measuring part and can move with the measuring part.

5. The online vibrating tube liquid density meter calibration device according to claim 1, characterized in that: The measuring part includes three parallel density meter installation positions, one end of each of the density meter installation positions is respectively provided with a stop valve K1, a stop valve K2 and a stop valve K3, and the other end is respectively provided with a stop valve K4, a stop valve K5 and a stop valve K6. After the stop valve K1, the stop valve K2 and the stop valve K3 are combined into one way, a thermometer W1 is arranged between them and the first measurement interface, and after the stop valve K4, the stop valve K5 and the stop valve K6 are combined into one way, a thermometer W2 is arranged between them and the second measurement interface.

6. The online vibrating tube liquid density meter calibration device according to claim 1, characterized in that: The calibration liquid circulation pipeline includes the first circulation interface, the first pressure regulating valve, the first heat exchange end of the first heat exchanger, the first stop valve, the constant temperature bath, the second stop valve, the second heat exchange end of the first heat exchanger, the pump, the flow meter, the second pressure regulating valve, the pressure gauge and the second circulation interface which are connected in sequence; a first branch is connected between the first circulation interface and the first pressure regulating valve, and the first branch includes a first manual stop valve and a standard density meter; a second branch is connected between the pump and the flow meter, and the second branch is connected to the drain outlet through the second manual stop valve; a third branch is connected between the second circulation interface and the pressure gauge, and the third branch includes a pressure pump.

7. The online vibrating tube liquid density meter calibration device according to claim 2, characterized in that: The water washing circulation pipeline includes the first circulation interface, the pressure regulating valve T4, the water tank S1, the pump P2, the pressure regulating valve T3 and the second circulation interface connected in sequence; the fourth branch is connected between the pump P2 and the pressure regulating valve T3, and the fourth branch is connected to the drain through the manual stop valve E3; The alcohol washing circulation pipeline includes the first circulation interface, the pressure regulating valve T8, the alcohol tank S2, the pump P4, the pressure regulating valve T7 and the second circulation interface connected in sequence; a fifth branch is also provided between the pump P4 and the pressure regulating valve T7, and the fifth branch is connected to the drain outlet through the manual stop valve E6; The air washing circulation pipeline includes the first circulation interface, the pressure regulating valve T9, the air pump Q1, the exhaust port and the second circulation interface which are connected in sequence.

8. The online vibrating tube liquid density meter calibration device according to claim 7, characterized in that: The calibration liquid circulation pipeline, the water washing circulation pipeline and the alcohol washing circulation pipeline are all connected to the air washing circulation pipeline, so as to blow and clean the residual liquid in the pipeline; The calibration liquid circulation pipeline, the water washing circulation pipeline and the alcohol washing circulation pipeline are respectively connected to the air washing circulation pipeline through three-way stop valves, and the three-way stop valve is also connected to the exhaust valve.

9. The online vibrating tube liquid density meter calibration device according to any one of claims 1 to 8, characterized in that: It also includes a PID control system for automatically controlling the online vibrating tube liquid density meter calibration device.

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