Meter clamping system for water meter durability test device

Abstract

The utility model relates to a meter clamping system for a water meter durability test device. The meter clamping system comprises a water circulation device, a meter clamping device, a detection device, a control device and an execution mechanism, the execution mechanism is arranged on the water circulation device and located at the upstream and downstream positions of the water meter; the control device is connected with the water circulation device, the execution mechanism and the detection device through electric signals. The system has the advantages that multiple parameters of the system cooperate, photoelectric detection and flow sudden change analysis are combined, and risk misjudgment is effectively reduced; the device is effective in safety protection, automatic valve closing is triggered through a flow decrease rate threshold value, leakage expansion is effectively prevented, and the equipment damage risk or other losses are reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of water meter durability equipment, specifically to a clamping system based on multi-parameter control. Background Technology

[0002] According to the requirements of the Water Meter Type Evaluation Outline JJF1777-2019, water meters must undergo durability testing to verify their durability under periodic or continuous flow conditions. For water meters with a common flow rate Q3 ≤ 16m³, a durability test is required. 3 The water meter (with a capacity of / h) is installed on the durability testing device and subjected to intermittent durability testing and Q4 continuous durability testing in sequence according to the procedures specified in the outline. The durability test often lasts for a long time, during which the equipment runs continuously. The traditional water meter durability testing device includes a water pump, pipelines, meter clamps, circulating water tank, etc. If the air supply to the meter clamp fails or other malfunctions occur during the durability test, causing the meter clamp to return to its original position unexpectedly, and the durability device is not shut down in time, the water in the tank will continuously overflow due to the action of the water pump, causing serious consequences. Utility Model Content

[0003] In order to solve the problems existing in the prior art, this utility model provides a clamping system based on multi-parameter control with a reasonable structural design.

[0004] The technical solution of this utility model is as follows:

[0005] A meter clamping system for a water meter durability testing device includes: a water circulation device, a meter clamp, a detection device, a control device, and an actuator;

[0006] The actuator is mounted on the water circulation device and located upstream of the water meter;

[0007] The detection device includes a photoelectric sensor and an electromagnetic flow meter. The photoelectric sensor is installed at the clamp position, and the electromagnetic flow meter is installed downstream of the water meter.

[0008] The control device is connected to the water circulation device, the actuator, and the detection device via electrical signals.

[0009] Furthermore, the water circulation device includes a water tank, a water pump, and pipes, and the water in the water tank circulates in the pipes under the drive of the water pump.

[0010] Furthermore, the actuator includes a pneumatic angle seat valve installed upstream of the water meter.

[0011] Furthermore, the control device includes a PLC controller and a host computer, with the PLC communicating with the host computer; the pneumatic angle seat valve is controlled by the PLC; and the water pump is controlled by the host computer.

[0012] Furthermore, the two photoelectric sensors are slidably mounted on two guide rails via sheet metal bases, which is used to control the distance between the two photoelectric sensors projected onto the axis of the clamping device extension tube.

[0013] Furthermore, the PLC controller is configured such that when the photoelectric sensor detects an obstruction, it sends a switching signal to the PLC. The host computer receives the signal and reads the flow rate value from the electromagnetic flowmeter via communication with the PLC. For ease of description, the instantaneous flow rate decrease rate is defined. In the formula Q m This represents the instantaneous flow rate of the fluid in the pipe during the previous sampling period. Q n This represents the instantaneous flow rate of the fluid in the pipe during the current sampling period. The rate of decrease in the instantaneous flow rate in the pipe... η If the value is ≥20%, the system will automatically save the existing data, trigger the execution module to close the pneumatic angle seat valve, shut down the water pump, and start the alarm.

[0014] The beneficial effects of this utility model are as follows: the system coordinates multiple parameters, combining photoelectric detection and flow change analysis to effectively reduce risk misjudgment; the device provides effective safety protection by triggering automatic valve closure through a flow drop rate threshold, effectively preventing leakage from expanding and reducing the risk of equipment damage or other losses. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the water meter durability device of this utility model;

[0016] Figure 2 This is a partial structural diagram of the system of this utility model;

[0017] Figure 3 This is a flowchart of the control logic of this utility model;

[0018] In the diagram, 1—water tank; 2—water pump; 3—pneumatic angle seat valve; 4—manual ball valve; 5—water meter; 6—photoelectric sensor; 7—meter clamp; 71—meter clamp extension tube; 72—quick connector; 8—electromagnetic flow meter; 9—sheet metal base; 10—guide rail. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] A meter clamping system with multi-parameter control for a water meter durability testing device consists of a water circulation device, a meter clamp, a detection device, a control device, and an actuator.

[0021] The water circulation device includes a water tank 1, a water pump 2, and pipes. Water in the tank circulates within the pipes under the drive of the water pump 2. The pipes connect various valves, pumps, and water meters. A clamp device 7 is installed downstream of the water meter 5. Figure 1 As shown.

[0022] like Figure 2 As shown, the gauge clamp 7 consists of a piston, cylinder, extension tube, inner tube, front and rear fixing plates and seals. It adopts a double-acting cylinder structure and is connected to the air source through quick-connect connector 72. The gauge clamp 7 is fixed to the platform of the durability test device by threaded connection.

[0023] The detection device includes two photoelectric sensors 6 and one electromagnetic flowmeter 8. The electromagnetic flowmeter 8 is installed downstream of the water meter 5 and fixed by a flange. The photoelectric sensors 6 are respectively mounted on sheet metal bases 9, which are fixed to guide rails 10 on the equipment platform. By sliding the sheet metal bases 9, the distance between the projections of the two photoelectric sensors 6 onto the axis of the meter clamp extension tube 71 is controlled at 0.5cm. After the meter clamp 7 completes the clamping process, the photoelectric sensors 6 are adjusted to the appropriate position, and the nuts on the sheet metal bases 9 are tightened to fix them. The specific position of the photoelectric sensors 6 can be adjusted and fixed by dragging the guide rail 10 according to the actual extension of the meter clamp extension tube 71. In this embodiment, the two photoelectric sensors 6 are a redundant design to prevent the system from making incorrect judgments if one of them fails.

[0024] The actuator includes pneumatic angle seat valves 3 installed upstream and downstream. In this embodiment, manual ball valves 4 are respectively provided between the upstream pneumatic angle seat valve 3 and the water meter 5 and downstream of the water meter 5 near the electromagnetic flow meter 8, for manually adjusting the water flow in the pipeline.

[0025] The control device includes a PLC controller and a host computer. The PLC communicates with the host computer via an RS485 bus to an RS232 bus. The pneumatic angle seat valve 3 is controlled by the PLC. The frequency converter of the water pump is controlled by the host computer.

[0026] PLC controller control logic as follows Figure 3 As shown, when water meter 5 undergoes a durability test, if photoelectric sensor 6 detects the disappearance of the obstruction, the system makes a preliminary judgment on the signal (to determine if it is caused by a loose clamp). If the number of photoelectric signal inputs is greater than or equal to 1, the host computer reads the flow value of electromagnetic flowmeter 8 and calculates the instantaneous flow rate decrease rate η in the pipeline. When the instantaneous flow rate decrease rate η in the pipeline is ≥ 20%, the system immediately triggers the actuator to close the valve group, automatically saves the existing data, and simultaneously shuts down the water pump frequency converter and activates the alarm.

[0027] In addition, at the beginning of the durability test, if the host computer reads the flow rate of the electromagnetic flowmeter 8 as 0 m3 / h and the photoelectric sensor 6 does not detect any obstruction, the host computer will prohibit the water pump from starting to prevent accidental operation of the device and water overflow from the water tank due to user accidental touch.

Claims

1. A clamping system for a water meter durability testing device, characterized in that, include: Water circulation device, clamp, detection device, control device and actuator; The actuator is mounted on the water circulation device and located upstream of the water meter; The detection device includes a photoelectric sensor and an electromagnetic flow meter. The photoelectric sensor is installed at the clamp position, and the electromagnetic flow meter is installed on the pipeline downstream of the water meter. The control device is connected to the water circulation device, the actuator, and the detection device via electrical signals.

2. The clamping system for a water meter durability testing device according to claim 1, characterized in that, The water circulation device includes a water tank, a water pump, and pipes. The water in the water tank circulates in the pipes under the drive of the water pump.

3. The clamping system for a water meter durability testing device according to claim 2, characterized in that, The actuator includes a pneumatic angle seat valve installed upstream of the water meter.

4. The clamping system for a water meter durability testing device according to claim 3, characterized in that, The control device includes a PLC controller and a host computer, and the PLC communicates with the host computer; the pneumatic angle seat valve is controlled by the PLC; the water pump is controlled by the host computer.

5. The clamping system for a water meter durability testing device according to claim 1, characterized in that, The two photoelectric sensors are slidably mounted on two guide rails via sheet metal bases, which are used to control the distance between the two photoelectric sensors projected onto the axis of the clamp extension tube.

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