JPH0570765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a calibration device, and more particularly to a calibration device in which a calibration device and a drainage container are movable.

(Prior Art) Weighing machines are required to be inspected once every five years to see if their weighing accuracy is within a certain range. Conventionally, a mass has been used for this calibration, but if a piston prover can be used as a reference weighing device during on-site verification, it will be possible to perform this type of calibration continuously, which will save a lot of effort. and can save time.

By the way, in order to perform calibration using this type of piston prover, it is necessary to connect the inflow side to the liquid supply pipe of the weighing machine and the outflow side to the supply port of the underground tank. If the supply port of the underground tank is far away, a long hose will be necessary and will get in the way, and when the piston reaches one end of the cylinder, the inertia of the liquid passing through the hose will cause the piston to move. A large negative pressure acts on the front surface, which causes a large resistance to act on the liquid flowing into the cylinder when the flow path is switched, causing problems such as lowering measurement accuracy.

(Purpose) The present invention was made in view of such problems,
The purpose is to provide a new weighing device that can accurately and efficiently weigh on the spot, regardless of the location of the weighing machine.

(Means for Achieving the Object) That is, the present invention is a calibration device for achieving the above object, in which a piston prover and a drainage container are each mounted on a trolley, and a conduit is connected to both ends of the piston prover. are connected through a pair of adjacent pipes equipped with 3-way valves, one 3-way valve is connected to the flowmeter to be tested, the other 3-way valve is connected to the drainage container via an on-off valve, and the piston puller An air flow sight glass with valves arranged at the front and back is interposed in the air conduit connected to the top of both ends of the bar, and one end of this air flow sight glass is connected to the top of the drain container.

(Example) The details of the present invention will be described below based on illustrated examples.

The drawing shows one embodiment of the present invention, and the reference numeral 10 in the drawing is a piston prover that is mounted on the first truck 1 so as to be transportable. Book pipe 11,1
A three-way valve 13 on the liquid supply side provided on one of the adjacent pipes 11 is connected to a liquid supply pipe 12 that communicates through the pipe 1, and a three-way valve 13 on the liquid supply side provided on one of the adjacent pipes 11 is provided with a coupling 40 that connects to the refueling nozzle N of the metering machine S. 16 is attached, and the three-way valve 14 on the drain side provided on the other attached pipe 11 has a liquid sending pipe 30 connected to a drain container 20, which will be described later.
One end of the is attached via a manual valve 15.

On the other hand, reference numeral 20 denotes a drain container mounted on the second truck 2 so as to be transportable, and a coupling ring 21 provided on the top surface of the drain container 20 has a piston prover
The other end of the liquid feeding pipe 30 connected to the coupling ring 41
At the lower end of this drain container 20, there is a drain pipe 23 connected to a supply port of an underground container (not shown) connected to a valve 24.
It is installed through.

In addition, the reference numeral 17 in the figure is a piston that reciprocates inside the piston prover 10, 18 is an air flow sight glass provided in the middle of a conduit 19 that connects both ends of the piston prover 10 via valves 42 and 43;
Reference numeral 1 designates an air conduit provided with a coupling ring 44 that is detachably attached to the air flow sight glass 18 and the other coupling ring 22 provided on the top surface of the drain container 20.

Next, a calibration operation using this device will be explained.

First, the first cart 1 carrying the piston prover 10 and the second cart 2 carrying the drain liquid container 20 are moved near the weighing machine S to be calibrated.

Next, the coupling 41 of the liquid sending pipe 30 and the coupling 42 of the air conduit 31 are respectively connected to the couplings 21 and 22 of the draining liquid container 20 to make them communicate integrally, and the liquid supply nozzle N of the measuring machine S is connected to the coupling 40. Connecting. Next, the three-way valve 13,
14 to the intermediate position, close the valve 15, and close the valves 42, 4.
When the metering device S is operated after opening 3, the liquid discharged from the liquid supply nozzle N is transferred to the piston prover 1.
0, and the air is pushed out through the air conduit 31 into the drain container 20, so look at the air flow sight glass 18, confirm that all the air has been pushed out, and close the valves 42 and 43. Calibration is performed by opening the valve 15 and appropriately switching the three-way valves 13 and 14.

Although it varies depending on the capacity of the drain liquid containers 20, if several measuring machines are calibrated and, for example, 70 drain liquid containers 20 are full, the liquid feed pipe 30 and the air conduit 31 are calibrated. Coupling ring 41,4
4 from the coupling rings 21 and 22 of the drain container 20 to disconnect it from the piston prover 10, move the second cart 2 to an underground container (not shown), and drain the drain container 20. After connecting the pipe 23 to the supply port of the underground container and draining the liquid therein, it is connected again to receive the liquid from the piston prover 10.

In the above embodiment, the first and second carts 1 and 2 are prepared, and the piston prover 10 and the drain container 20 are mounted on these. It can also be configured to be movable by attaching a car.

(Effects) As described above, according to the present invention, an air conduit is connected to both ends of a piston prover mounted on a trolley, and an air flow sight glass with valves arranged at the front and rear is interposed in this air conduit. By making the liquid flow from the flow meter under test into the piston prover with the conduit leading to the drain container closed during calibration, air mixed in the liquid can be smoothly discharged without moving the piston. It is possible to bleed the air completely and visually, and even if air gets mixed in during transfer or connection to a flowmeter to be tested, the air can be evacuated without changing the piston position. By confirming this, the calibration accuracy of the device can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an apparatus showing an embodiment of the present invention, and FIG. 2 is a configuration diagram of the same apparatus. DESCRIPTION OF SYMBOLS 1...First trolley, 2...Second trolley, 10...Piston prover, 20...Drainage container, 30...Liquid sending pipe,
31...Air conduit.

Claims (1)

[Claims] 1. A piston prover and a drainage container are each mounted on a trolley, and conduits connected to both ends of the piston prover are communicated via a pair of attached pipes equipped with a three-way valve, and one of the three-way A valve is connected to the flowmeter to be tested and the other three-way valve is connected to the drain container via an on-off valve, while an air conduit is connected to the top of both ends of the piston prover, and a valve is connected to the air conduit. A measuring device characterized in that an air flow sight glass is interposed in front and behind the air flow sight glass, and one end of the air flow sight glass is connected to the upper part of the drainage container.