Membrane type gas meter movement error curve detection table and testing method

Abstract

The application discloses a diaphragm gas meter core error curve detection table, which comprises a rack, a constant-flow air extraction system and a measurement and control system, and is characterized in that each of the core error curve detection stations comprises a core positioning mechanism and a vertical lifting docking mechanism; the core positioning mechanism comprises a guide limiting strip and a positioning block fixed on a table top of the rack; the vertical lifting docking mechanism is used for driving the air suction interface to vertically move and realize sealed docking or moving away from the air outlet on the positioned core. The application further discloses a diaphragm gas meter core error curve detection method. The application has the advantages that the air suction interface of the test table can be better ensured to be consistent with the air outlet on the diaphragm gas meter core, and the detection precision can be better ensured.

Description

Technical Field

[0001] This invention belongs to the field of diaphragm gas meter movement error curve testing platform, specifically relating to a diaphragm gas meter movement error curve testing platform and testing method. Background Technology

[0002] A diaphragm gas meter is an instrument used to measure gas consumption. Its error is the ratio between the difference between the volume displayed by the diaphragm gas meter and the actual gas flow volume passing through the diaphragm gas meter, and the actual gas flow volume passing through the diaphragm gas meter. Error is a key parameter for evaluating the quality of diaphragm gas meters and ensuring fairness in gas billing for users.

[0003] The movement in a diaphragm gas meter is the core of the metering process. Detecting the error curve of the movement can reflect the metering error of the diaphragm gas meter, thereby better ensuring that the diaphragm gas meters leaving the factory meet the metering accuracy and quality control requirements.

[0004] In the prior art, CN107702770A and CN207556631U (technical solutions filed on the same day) disclose a device for detecting the rate curve of a diaphragm gas meter movement. This device includes:

[0005] The serial port module connects to the PC via a USB-to-serial cable for serial communication.

[0006] The controller is connected to the serial port module via DuPont wires;

[0007] An optical encoder, connected to the controller, is used to measure the position information of the rotational movement of the diaphragm gas meter mechanism;

[0008] And the code disk, which is bonded to the valve cover and installed together with it on the valve grid of the diaphragm gas meter movement.

[0009] However, the above-mentioned "detection device for the rate curve of diaphragm gas meter movement" still has the following shortcomings:

[0010] Currently, in practical use, the diaphragm gas meter movement needs to be placed on the fixture of the sonic nozzle gas meter testing equipment, and the gas outlet pipe on the diaphragm gas meter movement needs to be connected to the gas intake interface on the testing device. The auxiliary action of "placing the diaphragm gas meter movement on the fixture of the sonic nozzle gas meter testing equipment and connecting its gas outlet pipe to the interface" to achieve the movement measurement is currently done manually. Manual operation is prone to fatigue and makes it difficult to guarantee the consistency and reliability of the sealing at the connection, which in turn interferes with the error curve detection results and affects the detection accuracy.

[0011] Based on this, the applicant considers designing a testing platform and testing method for the error curve of the diaphragm gas meter movement that can better ensure the consistency between the air intake interface of the test platform and the air outlet of the diaphragm gas meter movement, and better ensure the accuracy of the test. Summary of the Invention

[0012] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is:

[0013] How to provide a testing platform and testing method for the error curve of a diaphragm gas meter movement that can better ensure the consistency between the air intake interface of the test bench and the air outlet of the diaphragm gas meter movement, and better ensure the accuracy of the test?

[0014] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0015] A test bench for the error curve of a diaphragm gas meter movement, including a frame, a constant flow gas extraction system, and a measurement and control system;

[0016] At least one mechanism error curve detection station is fixedly installed on the frame;

[0017] The constant flow pumping system includes an intake port, a main solenoid valve, a filter, a stagnation container, a constant flow control pipeline, a vacuum container, and a vacuum pump, which are sealed and connected in series from front to back in the direction of airflow. The constant flow control pipeline includes at least two control branches connected in parallel between the stagnation container and the vacuum container. Each control branch is connected in series with a sonic nozzle and a branch solenoid valve.

[0018] The measurement and control system includes an atmospheric parameter measurement unit for measuring the temperature, pressure, and humidity parameters of the atmosphere surrounding the movement error curve detection station; a stagnation parameter measurement unit for measuring the pressure and temperature parameters inside the stagnation container; a measurement and testing mechanism for measuring the movement measurement at the movement error curve detection station; a flow meter for measuring the actual flow rate in the constant flow pumping system; and a controller for controlling the main solenoid valve, branch solenoid valves, and vacuum pump.

[0019] Its features are:

[0020] Each of the aforementioned movement error curve detection stations includes a movement positioning mechanism and a vertical lifting docking mechanism;

[0021] The movement positioning mechanism includes a guide limiting strip and a positioning block fixed on the table surface of the frame; the guide limiting strip is an elongated strip structure with a guide groove with an opening at the top, the guide groove is used for the positioning protrusion at the bottom of the movement to be inserted, guided and moved directionally along the guide groove; the positioning block is fixedly installed on the outer side of the end adjacent to the length direction of the guide limiting strip, the positioning block is used to block and position the side end of the movement that is directionally moving along the guide groove;

[0022] The vertical lifting docking mechanism is used to drive the air intake interface to move vertically and achieve a sealed docking or separation from the air outlet on the positioned movement.

[0023] Compared with existing technologies, the advantages of this diaphragm gas meter movement error curve testing platform are:

[0024] 1. The vertical lifting docking mechanism enables vertical sealing docking and separation between the air intake port on the testing platform and the air outlet on the core, thereby effectively ensuring the consistency and reliability of the sealing docking at the air intake port; reducing manual labor intensity, overcoming the situation of inaccurate test results caused by inconsistent docking due to human error, and better ensuring the objective accuracy of the test.

[0025] 2. More efficient inspection, easy to cooperate with robotic arms on automated assembly lines to automate the loading and unloading actions required for inspection.

[0026] A method for testing the error of a diaphragm gas meter movement, characterized in that: the aforementioned diaphragm gas meter movement error curve testing platform is used;

[0027] This method includes the following steps:

[0028] Step 1: Preparation before testing:

[0029] Set the calibration flow rates qmax, 0.2qmax, and qmin, and set the calibration time corresponding to each calibration flow rate;

[0030] Step 2: Loading the movement to be inspected:

[0031] The movement to be inspected is installed at each movement error curve detection station, and the air intake interface is sealed and connected with the air outlet of the movement to be inspected.

[0032] Step 3: Error Curve Detection and Recording:

[0033] Start the constant flow pumping system and the monitoring and control system records all detection parameters;

[0034] Step 4: The measurement and control system determines whether the movement's measurement error indicators are qualified and outputs the judgment result:

[0035] If the maximum error at each calibration flow rate is less than six-thousandths, it is qualified; if the maximum error at any calibration flow rate is greater than or equal to six-thousandths, it is unqualified.

[0036] In the method for testing the error of the diaphragm gas meter movement in this technical solution, due to the adoption of the above-mentioned detection bench for the error curve of the diaphragm gas meter movement, it has the advantages of high detection efficiency, good detection consistency, and guaranteed detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic structural diagram of the diaphragm gas meter movement (viewed from above)

[0038] Figure 2 Schematic structural diagram of the diaphragm gas meter movement (viewed from below)

[0039] Figure 3 Schematic structural diagram of the detection bench for the error curve of the diaphragm gas meter movement in this technical solution

[0040] Figure 4 Schematic structural diagram of the detection bench for the error curve of the diaphragm gas meter movement in this technical solution

[0041] Figure 5 Schematic structural diagram of the vertical lifting and docking mechanism part in this technical solution

[0042] Figure 6 Exploded view of the vertical lifting and docking mechanism part in this technical solution

[0043] Figure 7 Schematic structural diagram of the movement metering action detection mechanism part in this technical solution

[0044] Figure 8 Exploded view of the movement metering action detection mechanism part in this technical solution

[0045] Marked in the figure as:

[0046] A diaphragm gas meter movement: A1 crank, A2 lever, A3 positioning stud

[0047] Detection bench for the error curve of the diaphragm gas meter movement:

[0048] 100 frame;

[0049] Constant flow rate air extraction system: 101 suction interface, 102 main electric control valve, 103 filter, 104 stagnation container, 105 vacuum container (1051 T-joint), 106 sonic nozzle, 107 branch electric control valve

[0050] Error curve detection station for the movement: 108 guiding and limiting strip, 109 positioning block

[0051] 110 clamp

[0052] Vertical lifting docking mechanism:

[0053] 200 Mounting block (2001 Output end), 201 Drive cylinder, 202 Rigid telescopic tube (2021 Flange, 2022 Core tube (20221 Shoulder), 2023 Movable sleeve)

[0054] Transmission components: 203 main drive block, 204 transmission rod, 205 drive element (2051 connecting flange)

[0055] 206O type sealing ring

[0056] Movement measurement and testing organization:

[0057] 300 mounting bracket

[0058] Crank rotation detection unit: 301 Magnetic drive assembly for diaphragm gas meters (3011 lever, 3012 external magnetic group, 3013 internal magnetic group), 302 sensing element, 303 slotted proximity switch; 304 probe of reflective fiber optic sensor. Detailed Implementation

[0059] The present invention will now be described in further detail with reference to the accompanying drawings.

[0060] In practical implementation: such as Figures 1 to 8 As shown,

[0061] A test bench for the error curve of a diaphragm gas meter movement, including a frame, a constant flow gas extraction system, and a measurement and control system;

[0062] At least one mechanism error curve detection station is fixedly installed on the frame;

[0063] The constant flow pumping system includes an intake port, a main solenoid valve, a filter, a stagnation container, a constant flow control pipeline, a vacuum container, and a vacuum pump, which are sealed and connected in series from front to back in the direction of airflow. The constant flow control pipeline includes at least two control branches connected in parallel between the stagnation container and the vacuum container. Each control branch is connected in series with a sonic nozzle and a branch solenoid valve.

[0064] The measurement and control system includes an atmospheric parameter measurement unit for measuring the temperature, pressure, and humidity parameters of the atmosphere surrounding the movement error curve detection station; a stagnation parameter measurement unit for measuring the pressure and temperature parameters inside the stagnation container; a measurement and testing mechanism for measuring the movement measurement at the movement error curve detection station; a flow meter for measuring the actual flow rate in the constant flow pumping system; and a controller for controlling the main solenoid valve, branch solenoid valves, and vacuum pump.

[0065] Each of the aforementioned movement error curve detection stations includes a movement positioning mechanism and a vertical lifting docking mechanism;

[0066] The movement positioning mechanism includes a guide limiting strip and a positioning block fixed on the table surface of the frame; the guide limiting strip is an elongated strip structure with a guide groove with an opening at the top, the guide groove is used for the positioning protrusion at the bottom of the movement to be inserted, guided and moved directionally along the guide groove; the positioning block is fixedly installed on the outer side of the end adjacent to the length direction of the guide limiting strip, the positioning block is used to block and position the side end of the movement that is directionally moving along the guide groove;

[0067] The vertical lifting docking mechanism is used to drive the air intake interface to move vertically and achieve a sealed docking or separation from the air outlet on the positioned movement.

[0068] The advantages of this diaphragm gas meter movement error curve testing platform are:

[0069] 1. The vertical lifting docking mechanism enables vertical sealing docking and separation between the air intake port on the testing platform and the air outlet on the core, thereby effectively ensuring the consistency and reliability of the sealing docking at the air intake port; reducing manual labor intensity, overcoming the situation of inaccurate test results caused by inconsistent docking due to human error, and better ensuring the objective accuracy of the test.

[0070] 2. More efficient inspection, easy to cooperate with robotic arms on automated assembly lines to automate the loading and unloading actions required for inspection.

[0071] In practice, the atmospheric parameter measurement unit includes a temperature sensor, a pressure sensor, and a humidity sensor; the stagnation parameter measurement unit includes a temperature sensor and a pressure sensor.

[0072] The atmospheric parameter measurement unit and the stagnation parameter measurement unit are each connected to the controller via signal connection; the measurement and control system also includes a host computer, which is connected to the controller via communication.

[0073] After adopting the above technical solution, the software on the host computer (industrial control computer) can be used to collect and process the test data and measure the error curve. The calibration flow rate (qmax, 0.2qmax, qmin) can also be conveniently selected and set according to the specifications of the diaphragm gas meter (G1.6, G2.5, G4).

[0074] In practice, the controller is a PLC controller. The host computer is a desktop computer.

[0075] The movement error curve detection station is a dual station set up side by side;

[0076] The constant flow pumping system has one vacuum container; the constant flow pumping system has two sets of suction ports, main electric control valves, filters, stagnation containers and constant flow control pipelines, each corresponding to a dual-station configuration; and the two sets of constant flow control pipelines have the same number of control branches.

[0077] The vacuum container is fixedly equipped with a number of T-type connectors equal to the number of control branches in each set of constant flow control pipelines. The multiple T-type connectors are evenly distributed at intervals in the height direction of the vacuum container, and the vertical end of the T-shape of each T-type connector is the connection end that is sealed and fixed to the vacuum container. The two ends of the horizontal connecting pipe of each T-type connector are the connection ends that are connected to the tail end of a single control branch.

[0078] The advantages of the above technical solutions are:

[0079] The dual-station layout, with a shared vacuum container in the constant flow gas extraction system, significantly reduces the required installation volume of the constant flow gas extraction system, helping to reduce the space occupied by the diaphragm gas meter movement error curve detection station and improve the compactness of the structure.

[0080] The two sets of intake ports, main control valve, filter, stagnation container and constant flow control pipeline are arranged and installed symmetrically on the frame; and the main control valve, filter, stagnation container and constant flow control pipeline are all located in the inner space of the frame.

[0081] This design allows for full utilization of the internal space of the rack to accommodate the above components and makes the appearance of the testing station more concise. At the same time, the outer panel of the testing station can be used to protect and isolate dust, better ensuring the long-term reliable operation of the internal constant flow air extraction system components.

[0082] Furthermore, by arranging the above components in a symmetrical manner, the connection with the vacuum container and its various T-joints can also form a symmetrical structural arrangement. This also facilitates the efficient assembly and connection of adjacent interfaces using clamps and connecting pipes, thereby improving assembly efficiency.

[0083] In practice, the first embodiment of the vertical lifting docking mechanism (not shown in the figure) is:

[0084] The vertical lifting docking mechanism includes a support frame, a guide rail vertically arranged on the support frame, and a slider slidably assembled on the guide rail; a drive cylinder is also fixedly installed on the support frame, and the push rod of the drive cylinder faces downward and is fixedly connected to the upper end of the slider.

[0085] The slider is fixedly connected to the outside of the air intake port via a support connector.

[0086] In this way, the vertical lifting and docking mechanism ensures the precise consistency of vertical displacement through guide rails and sliders, ensuring precise docking between the air intake and the air outlet of the mechanism.

[0087] In implementation, the vertical lifting docking mechanism can adopt the second embodiment (preferred embodiment, such as...) Figure 3 , Figure 5 and Figure 6 (As shown) is:

[0088] The vertical lifting docking mechanism includes a mounting block, a drive cylinder, a transmission assembly, and a rigid telescopic tube;

[0089] The mounting block is used to fix it on the vertical mounting surface set on the frame of the diaphragm gas meter movement error curve detection station;

[0090] The mounting block has an L-shaped airflow channel that rotates 90 degrees clockwise through it.

[0091] The vertical outer end of the L-shaped airflow channel is the input end; the input end and the threaded interface at the upper end of the rigid expansion tube are sealed and connected by threads and a sealing ring; the lower edge of the rigid expansion tube has a flange, and an O-ring is fitted on the upper surface of the flange.

[0092] The outer lateral end of the L-shaped airflow channel is the output end. The end face where the output end is located is sealed and fixedly connected to the vertical mounting surface on the frame, and the vertical mounting surface has a through hole for the output end to be exposed. The output end is sealed and connected to the input end of the main solenoid valve through a pipe.

[0093] The drive cylinder is fixedly mounted on the mounting block. The push rod of the drive cylinder is vertically downward and fixedly connected to the upper section of the transmission assembly. The lower section of the transmission assembly is fixedly connected to the lower movable part of the rigid telescopic tube. The lower end of the transmission assembly has an annular portion that fits onto the lower movable part of the rigid telescopic tube, and the lower end face of the annular portion presses against the O-ring seal.

[0094] The outer diameter of the annular portion is the same as the outer diameter of the flange, and together with the O-ring seal, they form an air intake port for sealing the air outlet of the inserted movement.

[0095] The advantages of the vertical lifting and docking mechanism in this technical solution are:

[0096] 1. The connection and disconnection between the air intake port of the test bench and the air outlet of the mechanism are simple, accurate, and consistent.

[0097] By using this technical solution, the extension and retraction of the push rod can be controlled by manipulating the drive cylinder, thereby driving the transmission component to move and causing the lower section of the rigid telescopic tube to extend and retract vertically. This achieves a sealed connection and separation between the air intake and the air outlet on the mechanism, better ensuring the consistency of each connection and separation action.

[0098] 2. The reliability of the sealing connection can be effectively guaranteed.

[0099] The flange at the lower end of the rigid expansion tube and the annular part at the lower end of the transmission assembly can reliably clamp the O-ring seal, which can better ensure the sealing reliability when the air intake is inserted into the air outlet of the mechanism.

[0100] The rigid expansion tube includes an axially extending core tube and a movable sleeve;

[0101] The outer side of the upper end of the core tube has a shoulder, and the upper end surface of the shoulder is provided with an annular sealing groove in which an O-ring is embedded. The upper end surface of the step is used to achieve a sealed connection with the step surface of the step hole corresponding to the vertical outer end of the L-shaped airflow channel as the input end. The circumferential side of the shoulder of the core tube is provided with an external thread, and the external thread is engaged with the corresponding internal thread in the step hole to achieve a threaded fixed connection.

[0102] The movable sleeve sliding sealing sleeve is fitted onto the lower section of the core tube, and the lower end of the movable sleeve is provided with the flange and O-ring.

[0103] The rigid expansion tube described above includes a core tube and a movable sleeve, which allows the core tube to be used to achieve a reliable sealed and fixed connection with the mounting block and form a pipeline for transporting airflow.

[0104] The movable sleeve is slidably fitted onto the lower section of the core tube. The core tube not only functions as a conduit but also as a guide post to ensure the movable sleeve can vertically extend and retract along the axial direction of the core tube. The movable sleeve is fixedly connected to the transmission assembly, which can be driven by a cylinder to reliably extend and retract the movable sleeve.

[0105] The mounting block has an overall rectangular shape; the side of the mounting block is provided with a pressure measuring hole that communicates with the L-shaped airflow channel.

[0106] The rectangular mounting block has the advantages of high structural strength and simple shape.

[0107] Meanwhile, during implementation, it is preferable to use a hard metal block as the mounting block. The rectangular structure of the mounting block is easy to clamp and can be drilled and cut on each surface using a machining center. This helps to reduce the difficulty of positioning and machining, while also ensuring that the structure itself has high strength and can be used reliably for a long time.

[0108] The drive cylinder is fixedly mounted on the top surface of the mounting block;

[0109] The transmission assembly includes a main drive block, a transmission rod, and a drive component;

[0110] The main drive block is generally flat, and the top surface of the mounting block is provided with a clearance groove for the vertical lifting and lowering movement of the main drive block.

[0111] The portion of the installation located on both sides of the L-shaped airflow channel also has two vertical through holes, the upper end of which communicates with the clearance groove; a transmission rod is slidably inserted into each vertical through hole, and the upper end of each transmission rod is fixedly connected to the main drive block.

[0112] The upper end of the driving component is fixedly connected to the lower end of the transmission rod, and the lower end of the driving component is provided with the annular portion.

[0113] The advantages of the movement metering and motion detection mechanism in this technical solution are:

[0114] 1. This technical solution uses the crank lever on the movement to directly trigger and generate the electrical signal for measurement, eliminating the need for auxiliary measurement procedures before testing, thus making the testing efficiency more efficient; furthermore, since there is no need to install auxiliary testing devices on the movement, the consistency and accuracy of each test can be better guaranteed.

[0115] 2. In the existing technology, the detection action position for movement measurement is located on the valve grille or rocker arm with a large movement amplitude; correspondingly, the larger the movement amplitude, the longer the regular movement cycle, the greater the measurement error and the lower the detection accuracy.

[0116] This technical solution selects the crank and its lever for rapid selection as the detection target for the movement's metering action. The crank and its lever are always in circular rotation, resulting in a shorter cycle time, higher frequency of action, and higher accuracy of metering and detection.

[0117] The mounting brackets are provided on both the left and right sides of the movement error curve detection station in the length direction of the diaphragm gas meter movement error curve detection station.

[0118] Because diaphragm gas meters have two structural forms: left inlet and right outlet, and right inlet and left outlet, and the crank is positioned differently in each structural form.

[0119] This technical solution provides mounting brackets on both the left and right sides of the length direction of the movement error curve detection station on the diaphragm gas meter movement error curve detection platform, which can simultaneously accommodate two different structural forms, improve the versatility of the detection platform in this technical solution, and help reduce detection costs.

[0120] like Figure 7 and Figure 8 The following is a second embodiment of the movement metering and motion detection mechanism:

[0121] The crank rotation detection unit includes an intermediate transmission assembly, a sensing plate, and a through-beam proximity switch.

[0122] The intermediate transmission assembly has a fixed part, a driving part, and a transmission part; the intermediate transmission assembly is fixedly mounted on the mounting bracket via its fixed part; the driving part has a radially protruding paddle, which is driven by a lever and rotates with the crank; the transmission part is coaxially driven and connected to the driving part, and the outer end of the transmission part is fixedly mounted with the sensing plate, which has at least one protrusion radiating radially outward from the axis.

[0123] The through-beam proximity switch is fixedly mounted on the mounting bracket, and the transmitting end and receiving end of the through-beam proximity switch are arranged facing each other, with the connecting line between them located on the rotation path of the protruding part of the sensing element.

[0124] The above intermediate transmission components can be driven by the crank lever to achieve synchronous rotation, thereby synchronously transmitting the crank's metering action to the induction plate. The movement of the extended part of the induction plate can be detected by a through-beam proximity switch, thus successfully achieving accurate measurement of the movement.

[0125] The through-beam proximity switch is a one-piece molded slot-shaped proximity switch.

[0126] This allows for better integration of the slot-type proximity switch, saving the need to design separate support structures for the transmitter and receiver, and making installation more convenient.

[0127] The intermediate transmission component is a magnetic transmission component for diaphragm gas meters.

[0128] The magnetic drive assembly for diaphragm gas meters can synchronize the rotation of the crank to help achieve accurate measurement. Similarly, the magnetic drive assembly for diaphragm gas meters can also be used for high-precision testing of movement errors.

[0129] In practice, the structure of the magnetic transmission assembly for a diaphragm gas meter is as shown in CN113932871A, "A Small Magnetic Transmission Structure for a Diaphragm Gas Meter," comprising an outer magnetic group and an inner magnetic group. The inner magnetic group is located inside the outer magnetic group. The outer magnetic group includes a first outer magnetic sleeve, a second outer magnetic sleeve, and an outer magnet. The outer magnet is an annular cylinder, and the first and second outer magnetic sleeves are respectively engaged at both ends of the outer magnet. The inner magnetic group includes a first inner magnetic sleeve, a second inner magnetic sleeve, and an inner magnet. The inner magnet is also an annular cylinder, and the first and second inner magnetic sleeves are respectively engaged at both ends of the inner magnet. The outer magnet is made of ferrite material, and the inner magnet is made of neodymium iron boron material.

[0130] In this technical solution, the bushing of the "small magnetic transmission structure of a diaphragm gas meter" is fixedly installed on the mounting bracket, the outer magnetic group is coaxial with the crank on the test mechanism and the paddle on the outer magnetic group is driven to rotate by the paddle on the crank, and the threaded connecting column in the inner magnetic group is fixedly connected to the induction plate through a connecting seat.

[0131] The sensor sheet has an overall cross-shaped structure.

[0132] In this way, a full rotation can be counted four times, which increases the frequency of the measurement technology and thus helps to improve the accuracy of error detection.

[0133] like Figure 3 The illustration shows a first and a second embodiment of a core metering action detection mechanism, wherein the first embodiment is:

[0134] The crank rotation detection unit is either a reflective fiber optic sensor or a capacitive proximity switch. The probe of the crank rotation detection unit is fixed on the mounting bracket and located radially outside the crank. The probe can generate a trigger electrical signal when it is closest to the lever on the crank when it rotates one revolution.

[0135] The fiber optic probe of the reflective fiber optic sensor has the advantages of compact structure, easy installation and accurate detection, which can ensure the metrological detection accuracy of this test bench.

[0136] The method for testing the error of a diaphragm gas meter movement uses the aforementioned diaphragm gas meter movement error curve testing platform.

[0137] This method includes the following steps:

[0138] Step 1: Preparation before testing:

[0139] Set the calibration flow rates qmax, 0.2qmax, and qmin, and set the calibration time corresponding to each calibration flow rate;

[0140] Step 2: Loading the movement to be inspected:

[0141] Load the movement to be inspected at each movement error curve detection station, and seal the docking between the air suction interface and the air outlet on the movement to be inspected;

[0142] Step 3: Error curve detection and recording:

[0143] Start the constant flow air extraction system, and the measurement and control system records each detection parameter;

[0144] Step 4: The measurement and control system determines whether the movement measurement error index is qualified and outputs the judgment result:

[0145] If the maximum error under each verification flow rate is less than six thousandths, it is qualified; if the maximum error under any verification flow rate is greater than or equal to six thousandths, it is unqualified.

[0146] The movement error test method of the diaphragm gas meter in this technical solution has the advantages of high detection effect, good detection consistency, and guaranteed detection accuracy because the above-mentioned diaphragm gas meter movement error curve detection bench is adopted.

[0147] The above is only the preferred implementation mode of the present invention. It should be noted that for those skilled in the art, without departing from the premise of this technical solution, several modified and improved technical solutions should also be regarded as falling within the scope protected by this claim book.

Claims

1. Diaphragm gas meter movement error curve testing platform, including frame, constant flow gas extraction system and measurement and control system; At least one mechanism error curve detection station is fixedly installed on the frame; The constant flow pumping system includes an intake port, a main electrically controlled valve, a filter, a stagnation container, a constant flow control pipeline, a vacuum container, and a vacuum pump, which are sequentially and sealed in series from front to back in the direction of airflow. The constant current control pipeline includes at least two control branches connected in parallel between the stagnation container and the vacuum container, and each control branch is connected in series with a sonic nozzle and a branch-controlled valve. The measurement and control system includes an atmospheric parameter measurement unit for measuring the temperature, pressure, and humidity parameters of the atmosphere surrounding the movement error curve detection station; a stagnation parameter measurement unit for measuring the pressure and temperature parameters inside the stagnation container; a measurement and testing mechanism for measuring the movement measurement at the movement error curve detection station; a flow meter for measuring the actual flow rate in the constant flow pumping system; and a controller for controlling the main solenoid valve, branch solenoid valves, and vacuum pump. Its features are: Each of the aforementioned movement error curve detection stations includes a movement positioning mechanism and a vertical lifting docking mechanism; The movement positioning mechanism includes a guide limiting strip and a positioning block fixed on the table surface of the frame; the guide limiting strip is an elongated strip structure with a guide groove with an opening at the top, the guide groove is used for the positioning protrusion at the bottom of the movement to be inserted, guided and moved directionally along the guide groove; the positioning block is fixedly installed on the outer side of the end adjacent to the length direction of the guide limiting strip, the positioning block is used to block and position the side end of the movement that is directionally moving along the guide groove; The vertical lifting docking mechanism is used to drive the air intake interface to move vertically and achieve a sealed docking or separation from the air outlet on the positioned movement.

2. The diaphragm gas meter movement error curve testing platform according to claim 1, characterized in that, The atmospheric parameter measurement unit and the stagnation parameter measurement unit are each connected to the controller via signal connection; the measurement and control system also includes a host computer, which is connected to the controller via communication.

3. The diaphragm gas meter movement error curve testing platform according to claim 1, characterized in that: The movement error curve detection station is a dual station set up side by side; The constant flow pumping system has one vacuum container; the constant flow pumping system has two sets of suction ports, main electric control valves, filters, stagnation containers and constant flow control pipelines, each corresponding to a dual-station configuration; and the two sets of constant flow control pipelines have the same number of control branches. The vacuum container is fixedly equipped with a number of T-type connectors equal to the number of control branches in each set of constant flow control pipelines. The multiple T-type connectors are evenly distributed at intervals in the height direction of the vacuum container, and the vertical end of the T-shape of each T-type connector is the connection end that is sealed and fixed to the vacuum container. The two ends of the horizontal connecting pipe of each T-type connector are the connection ends that are connected to the tail end of a single control branch.

4. The diaphragm gas meter movement error curve testing platform according to claim 3, characterized in that: The two sets of intake ports, main solenoid valve, filter, stagnation container and constant flow control pipeline are arranged and installed symmetrically on the frame; and the main solenoid valve, filter, stagnation container and constant flow control pipeline are all located in the inner space of the frame.

5. The diaphragm gas meter movement error curve testing platform according to claim 1, characterized in that: The vertical lifting docking mechanism includes a mounting block, a drive cylinder, a transmission assembly, and a rigid telescopic tube; The mounting block is used to fix it on the vertical mounting surface set on the frame of the diaphragm gas meter movement error curve detection station; The interior of the mounting block is penetrated by an L-shaped air flow channel that rotates 90 degrees clockwise; The vertical outer end of the L-shaped air flow channel is the input end; a threaded connection with a sealing ring is used to achieve a sealed connection between the input end and the threaded interface at the upper end of the rigid telescopic tube; the lower edge of the rigid telescopic tube has a flange, and an O-ring is sleeved on the upper end surface of the flange; The horizontal outer end of the L-shaped air flow channel is the output end, and the end surface where the output end is located is fixedly and sealedly connected to the vertical mounting surface on the frame, and the vertical mounting surface has a through hole for the output end to expose; the output end is sealedly connected to the input end of the main electric control valve through a pipeline; The driving cylinder is fixedly installed on the mounting block, the push rod of the driving cylinder is vertically downward and fixedly connected to the upper section of the transmission component, the lower section of the transmission component is fixedly connected to the movable part of the lower section of the rigid telescopic tube, and the lower end of the transmission component has a circular ring part sleeved on the movable part of the lower end of the rigid telescopic tube and the lower end surface of the circular ring part presses against the O-ring; The outer diameter of the circular ring part is the same as the outer diameter of the flange and together with the O-ring constitutes a suction interface for sealingly inserting the air outlet of the movement.

6. The diaphragm gas meter movement error curve testing platform according to claim 1, characterized in that: The movement metering action detection mechanism includes a mounting bracket and a crank rotation detection unit fixed on the mounting bracket; The mounting bracket is fixed at a position beside the movement error curve detection station on the movement error curve detection table of the diaphragm gas meter; The crank rotation detection unit is used to be directly triggered by the dial on the crank of the movement and generate an electrical signal for detecting the metering of the movement, and the direct trigger by the dial is a non-contact trigger or a contact trigger with the dial.

7. A method for testing the error of a diaphragm gas meter movement, characterized in that: Adopt the movement error curve detection table according to any one of claims 1 to 6; This method includes the following steps: The first step, preparation before detection: Set the verification flow rates qmax, 0.2qmax and qmin, and set the verification time corresponding to each verification flow rate; The second step, feeding the movement to be detected: Load the movement to be detected into each movement error curve detection station, and the suction interface is sealed and docked with the air outlet of the movement to be detected; The third step, error curve detection and recording: Start the constant flow air extraction system, and the measurement and control system records each detection parameter; The fourth step, the measurement and control system judges whether the movement metering error index is qualified and outputs a judgment result: If the maximum error under each verification flow rate is less than six thousandths, it is qualified; if the maximum error under any verification flow rate is greater than or equal to six thousandths, it is unqualified.

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