JPH063396B2 - Piston prober - Google Patents

Description

TECHNICAL FIELD The present invention mainly relates to a piston prober having a feature in a detection unit.

(Prior Art) A piston prober used for calibration of a flow meter or the like usually has rods b on both ends of a piston a, as shown in FIG.
b is extended in the axial direction so that the detection plates d and d provided at the tip face the sensors s and s arranged outside the cylinder c.

For this reason, in the conventional devices, a slight axial runout of the piston a generated during the movement greatly shakes the plate d to be detected at the end of the rod b, which causes a detection error and causes both ends of the piston a to move. Since the length of the rods b, b protruding to the end must be at least the length corresponding to the stroke of the piston, not only the device becomes extremely long, but also the entire device must be disassembled for repair and inspection. I have a problem.

(Purpose) The present invention has been made in view of the above problems, and an object of the present invention is to provide a new piston prober that improves detection accuracy, downsizes the device, and facilitates repair and inspection.

(Means for Achieving the Purpose) That is, according to the present invention, as a piston prober for achieving the above-mentioned object, a mounting tube provided with a detecting means is pivotally supported at an end of a cylinder so as to be rotatable and separable. A driven member which is pressed by the piston in the movement end region of the piston and moves into the detection region of the detection means is disposed in the mounting pipe, and the driven member is pulled into the mounting pipe in a part of the driven member. A pin insertion hole that locks at a position is provided.

(Example) Therefore, the details of the present invention will be described below based on an illustrated example.

FIG. 2 shows an embodiment of the present invention, in which reference numeral 1 is a face plate which is attached to both ends of a cylinder 2 with hinges 3 so as to be openable and closable. A mounting pipe 4 extending outward along the center is fixedly mounted, and a driven rod 6 urged by a coil spring 7 to constantly project into the cylinder 2 is slidable on bearings 5 and 5 provided at both ends thereof. Further, the driven rod 6 is integrally mounted with a detection plate 8 detected by a measurement sensor 10 and a valve switching sensor 11 arranged in a portion of the mounting pipe 4 near the cylinder 2. A hole 12 for inserting a stopper pin is provided for holding the driven rod 6 in a state of being pulled into the mounting pipe 4 when the device is disassembled. Reference numeral 13 denotes an auxiliary pipe having a length that allows for a protruding margin of the driven rod 6 fixed to the outer end of the mounting pipe 4. The auxiliary pipe 13 has a length of 2 mm as shown in FIG.
The flowmeter Q to be tested and the conduit 14 communicating with the discharge side flow path are connected via the three three-way valves V ₁ and V ₂ . In the figure, reference numeral 15 is a stopper made of an elastic material provided on the face plate 1 to mitigate the collision of the piston 9, and V ₃ and V ₄ are manual valves for forming a bypass flow passage not passing through the piston prober. Shown respectively.

In the above-described embodiment, when the pump P is operated with the manual valve V ₃ closed, the fluid in the oil tank T flows from the flowmeter Q to the first three-way valve V as shown by the solid line in FIG. ₁
Through the left end of the cylinder 2 to move the piston 9 from its left end position to the right in the figure. By this movement, the driven rod 6 on the left side, which has been pressed to the left side in the figure until then,
Is moved by the coil spring 7 to the right, the measuring sensor 10 disposed near the end of this movement is driven by the driven rod 6.
The detection target plate 8 fixed to is detected, a measurement start signal is output, and the counter of the display is operated.

After this, the driven rod 6 stops at the end of the mounting pipe 4, but the piston 9 moves further to the right due to the inflow of fluid into the cylinder 2, and in the vicinity of the end of its stroke, the driven rod to the right now. 6 is contacted and pressed.

Therefore, the driven rod 6 on the right side pressed by the piston 9 moves outward against the coil spring 7, and this movement causes the measuring sensor 10 to detect the plate 8 to be detected and output it to display the indicator. The counter is stopped and the valve switching sensor 11
Switches the three-way valves V ₁ and V ₂ to guide the fluid from the flow meter Q to the opposite side of the cylinder 2 via the control device. By the way, there is a slight time lag in switching these valves V ₁ and V ₂ , and during this time the piston 9 moves further to the right, but the overrun during this time is caused by the valve switching sensor 11 and the end of the mounting pipe 4. Even if the valve is not switched, it is absorbed by a clearance provided between the piston 9 and the piston 9 by the drag force of the coil spring 7 acting via the driven rod 6 and the stopper 15 on the face plate 1. Collisions are mitigated.

On the other hand, when repairing and inspecting the device, as shown in FIG. 4, the auxiliary pipe 13 is removed, and then the driven rod 8 is retracted into the mounting pipe 4 against the coil spring 7, which is not shown. The cylinder 2 and the mounting pipe 4 can be easily separated by holding the stopper pin and rotating the face plate 1 about the hinge 3 as a fulcrum.

(Effects of the Invention) According to the present invention as described above, the mounting pipe provided with the detecting means is pivotally supported at the end of the cylinder so as to be pivotally separable.
During repairs and inspections, the mounting tube can be rotated around the end of the cylinder as a fulcrum to open the inside, so that repairs and inspections can be performed easily and quickly. Since the driven member that is pressed by the piston and moves into the detection area of the detection means is provided, not only the movement of the shaft of the piston is unaffected, but also the movement thereof can be accurately detected. Regardless of the stroke, the movement of the driven member can be reduced as much as possible, and the size of the device can be greatly reduced.Furthermore, at a position where this driven rod is pulled into the mounting pipe, Since the pin insertion hole for locking is provided, at the time of repair and inspection, the mounting pipe can be rotated and separated without any trouble in a state where the driven rod is retracted.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a conventional device, FIG. 2 is a sectional view of a main part showing an example of the device of the present invention, FIG. 3 is a calibration circuit diagram using the same device, and FIG. 4 is an exploded state. FIG. 1 ... Face plate, 2 ... Cylinder 4 ... Mounting tube, 6 ... Driven rod 9 ... Piston, 10, 11 ... Sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 54-153062 (JP, A) Actually opened 56-102424 (JP, U) Actually opened 54-51566 (JP, U) Japanese Patent Publication 54- 15220 (JP, B2) U.S. Pat. No. 3,387,632

Claims (1)

[Claims] 1. A mounting pipe provided with a detection means is pivotally supported at an end of a cylinder so as to be rotatable and separable, and the mounting pipe is pressed by the piston in a movement end region of the piston to detect the detection means. A piston characterized in that a driven member that moves into a detection region is provided, and a pin insertion hole that locks the driven member at a position where the driven member is pulled into the mounting pipe is provided in a part of the driven member. Prouvers.