JPS60202313A - Variable capacity type piston prover - Google Patents

Abstract

PURPOSE:To make it possible to perform several kinds of measurement by one set of a prover regardless of the amount of liquid to be measured, by arranging a moving-end detecting member of a piston in the axial direction of a cylinder so that the reciprocal movement can be adjusted. CONSTITUTION:A piston prover has a pipe 1, which penetrates a plate 3 of a cylinder 2 and is attached in an airtight manner so that the pipe can be slidden in the axial direction. A slave lever 6, to which a plate to be detected 7 is fixed, is arranged on bearings 5 and 5, which are provided at both ends of the pipe 1 so that the lever 6 can be slidden. As a result, the back and forth movement of the plate to be detected 7 in the axial direction of the cylinder can be adjusted. Therefore, when a piston 4 reaches the vicinity of the end of the movement corresponding to the amount to be detected, the piston is contacted with the slave lever 6. The position of the end of the movement is detected by a measuring sensor S1 through the plate to be detected 7. Thus, several kinds of measurements can be performed by one set of the prover regardless of the amount of the liquid to be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION ((*Technical Field) The present invention relates to a piston prover that enables multiple verifications of different capacities.

(Prior art) A piston prover used for calibration of a flow meter, etc. is configured to measure the liquid volume from the movement of a piston that moves from one end of the cylinder to the other end. was specific to each piston prover.

Since the capacity to be calibrated varies depending on the model of the flow rate indicator 1, conventional piston provers have had the problem of having to prepare a separate piston prover for each capacity.

(Objective) The present invention has been made in view of the above problems, and its object is to provide a piston prover with a simple structure that allows several types of calibration to be performed with one unit.

(Structure) Therefore, the details of the present invention will be described below based on the illustrated embodiment.

The drawing shows one embodiment of the present invention, and the reference numeral l in the drawing indicates a conduit that is airtightly arranged so as to penetrate the face plate 3 of the cylinder 2 and slide in the axial direction thereof. A driven rod 6 to which a plate 7 to be detected is fixed is slidably attached to bearings 5.5 provided at both ends, and is normally biased by a coil spring 8 interposed between the outer bearing 5 and the plate 7 to be detected. and protrudes into the cylinder 2, and is configured to receive its suppressing action near the end of the stroke of the piston 4. Further, an auxiliary conduit 9 having a length that allows for the stroke of the driven rod 6 is integrally fixed to the outer end of this conduit l, and a post 11 provided on the outer periphery of this end plate 10 is connected to the face plate of the cylinder 2. Accurate axial movement of the conduit 1 is ensured by sliding it on a guide rod 14 fixed to the base plate 10, and a screw punch 13 protruding outward from the end plate 10 is fixed to the end of the guide rod 14. 15, screw it onto the handle 16 which is rotatably attached to the board 15, and turn the handle 16 H1i,
t to adjust the movement in the 4111 direction.

Note that the reference numeral 12 in the figure indicates a fluid supply 1 provided in the auxiliary conduit 9.
S2 is a measurement sensor that detects the detection plate 7 of the driven rod 6 and outputs +ij number start and end r signals to the counter in the display, S2 is the detection plate 7 5r switching sensor that detects and outputs a signal to switch the supply side and discharge side three-way valves v1 and v2 (v), v3 and v4 are manual valves provided to form a bypass flow path that does not go through the piston prover. are shown respectively.

In the embodiment described above, when the handle 16 on the base plate 15 is now rotated in either direction and the conduit 1 is positioned at a desired position according to the scale marked on the guide rod 14, etc., the coil spring 8 is moved. The driven rod 6, which is forced to protrude into the cylinder 2, occupies a position where it comes into contact with the piston 4 near the end of the stroke of the piston 4, which has moved in accordance with the amount of liquid to be tested.

Therefore, in this state, turn on the main switch Sw and continue! When the fluid from the meter Q is guided to the right side of the cylinder 2 through the manual valve 4, the three-way valve v1, and the right conduit l', the piston 4 starts moving to the left due to the inflow of fluid. The pressure on the driven rod 6' is released and it is slid to the left by the biasing force of the coil spring 8, and the measurement sensor S1 detects passage of its own starting point via the detection plate of the driven rod 6'. and operate the counter of the display by the output signal,
The pulse signal from the flow meter Q is counted. The piston 4 then moves further to the left, away from the right driven rod 6, due to the continued inflow of fluid, and when it reaches near the end of its travel corresponding to the amount to be verified, it reaches the preset value. The robot contacts and presses the protruding driven rod 6 at the position where it is located, and the measuring sensor s detects the end position of its own movement via the detection plate 7, and the counter of the display is stopped by the detection output. At the same time, the output No. 411 from the valve switching sensor s2 switches the three-way valves v1 and V2 so that the fluid from the flowmeter Q is guided to the opposite side of the cylinder 2 via the control circuit.

Further, in this device, the first plate 3 can be opened and closed for 9 dollars 17, and the inside of the device row can be easily repaired and inspected by opening and closing the face plate 3.

Note that instead of moving the conduit 1, the detection plate 7 may be made movable from the outside, or the length y of the driven rod 6 may be made variable from the outside.

(Effects) As described above, according to the present invention, the piston moving end detecting member is arranged so as to be able to move forward and backward in the cylinder axial direction. Not only can calibration be performed, but by making the detection 7% material independent of the piston, accurate position detection can be performed regardless of axial vibration of the piston.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an apparatus showing one embodiment of the present invention, and FIG.
The figure is a circuit configuration diagram of a calibration mechanism using the same device. 1... Conduit 2... Cylinder 4... Piston 6... Driven rod 7... Detected plate Work 3... Screw punch 16... Handle 51
, 52 "" Sensor Q...Flowmeter Applicant Tokyo Tatsuno Co., Ltd. Agent Patent attorney Osamu Nishikawa 1 Tatami

Claims (1)

[Claims] A variable speed piston prover characterized in that a piston moving end detecting member is arranged to be adjustable in forward and backward movement in the axial direction of the cylinder.