JPS6272089A - Pump stroke counter - Google Patents

Abstract

PURPOSE:To obtain a cheap stroke counter of a pump by providing a pointer made of steel that moves in position with the piston rod of a pump, processing a signal of movement of the pointer detected by a proximity switch that detects passage of the pointer, and displaying in a count display section. CONSTITUTION:A crosshead 9 is fixed in the middle part of a piston rod 5 exposed between a steam cylinder 1 and a liquid cylinder 3, and a pointer 10 made of steel is attached fixedly to the surface of the crosshead 9 by screws 11 in the direction at right angles to the piston rod 5. A mount 12 is fixed by a U-bolt 13 to a support 8 on fixed side of a pump, and a contactless switch 15 is fixed to the mount 12 through an angle type fitting 14. When the steel pointer 10 passes the front of the detecting face 16, the proximity switch 15 responds to the passage, and outputs a signal. The signal is processed by a remote display board and displayed in a counter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pump stroke counter that detects the number of times a reciprocating pump is operated, which is installed on a ship or a marine structure.

[Prior Art] In a reciprocating pump such as a stripping pump, when it is necessary to detect the number of pump operations, conventionally, the number of reciprocating movements of the piston rod is detected using pneumatic, hydraulic,
It was detected by a stroke counter in a set of optical fibers.

[Problems to be solved by the invention] The pneumatic, hydraulic, and fiber optic stroke counters conventionally used to detect the number of reciprocating movements of a piston rod have been extremely expensive. .

The present invention aims to provide a pump stroke counter that can detect the number of reciprocating movements of a piston rod using extremely inexpensive means.

[Means for Solving the Problems 1] The present invention is provided with a steel pointer so as to be displaced together with the piston rod of the pump, and a proximity switch for detecting passage of the pointer (when used in a cargo oil pump room, a proximity switch is provided). (using a safety type proximity switch) on the fixed side of the pump, and
This pump stroke counter is equipped with a remote display panel that processes the signal of the movement of the pointer detected by the proximity switch and displays it on a count display section.

[Operation] When the pump operates, the pointer moves back and forth with the piston, and the proximity switch detects the back and forth movement of the pointer. This detected signal is processed by a remote display panel and displayed on a counter.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a steam cylinder on the drive side of the pump, and a steam piston 2 is provided inside. 3 is a liquid cylinder, inside which is a liquid piston 4.
The steam piston 2 and the liquid piston 4 are connected by a piston rod 5. When steam is supplied from the steam supply pipe 6 to the steam cylinder 1, the steam piston 2 reciprocates, and along with this, the piston rod 5
The liquid piston 4 reciprocates, and the pressurized liquid in the liquid cylinder 3 is sent from the valve box 7 to a tank or land equipment (not shown). The steam cylinder 1 and the liquid cylinder 3 are connected by a strut 8, and these steam cylinders 1,
The liquid cylinder 3 and the strut 8 form the fixed side of the pump.

As shown in FIGS. 1 and 2, a crosshead 9 is fixed to the intermediate portion of the piston rod 5 exposed between the steam cylinder 1 and the liquid cylinder 3. A pointer 10 made of No. 14 is attached to the piston rod 5 with a screw 11 in a direction perpendicular to the piston rod 5. As shown in FIG. 3, the pointer 10 is made in the shape of a arm, and has dimensions of approximately 21L in thickness and 25 to 30a+i in width. When the steam piston 2, piston rod 5, and liquid piston 4 reciprocate as described above, the pointer 10 also reciprocates together with the piston rod 5.

As shown in FIG. 2, a mounting base 12 is fixed to the column 8, which is the fixed side of the pump, with U-bolts 13, and a proximity switch 15 is attached to the mounting base 12 via an angle-shaped mounting hardware 14. It is being

The surface of the proximity switch 15 is the detection surface 1 as shown in FIG.
G and when the pointer 10 moves back and forth, the second
As shown in the figure, the pointer 10 points the front surface of the detection surface 16 from 10 to
They are designed to pass at intervals of about 15u.

When the steel pointer 10 passes in front of the detection surface 16 of the proximity switch 15 in this manner, the proximity switch 15 outputs a signal in response to this.

The signal output from the proximity switch 15 is sent to the control unit 18 via the power supply unit 17 shown in FIG. 5, where it is converted into an on-off relay signal output and then transmitted to the remote display W19. . An N source switch 20, a power indicator light 21, a stroke number meter 22, and a stroke number HA tightness meter 23 are attached to the remote display panel 19.

The stroke counter 22 is a two-digit liquid crystal display that counts the on-off signal sent from the control unit 18 for 10 seconds using a count relay, and displays 6 times this number in units of "N times 7 minutes". A display or electronic display is used. Also, this circuit display [N number of times 7] indicates the number of times the pointer 10 passes the detection surface 16 of the proximity switch 15, and indicates that one reciprocation of the piston rod 5 (see Figures 1 and 2) is 2 times. It is supposed to be done. The stroke count totalizer 23 uses a 5-digit liquid crystal display or electronic display that integrates the on-off signals sent from the control unit 18 regardless of time and displays the result as is. , there is a reset switch that resets the count to zero.

6 and 7 show other embodiments of the present invention, in which a proximity switch 15 is attached to a pump support portion 24, which is the fixed side of the pump, via a mounting base 12, and the base end of a locking lever 25 is attached. A steel pointer 10 is provided protruding from the base end of the locking lever 25, and the tip of the locking lever 25 is connected to the piston rod 5 of the pump. In this embodiment, when the piston rod 5 reciprocates, the pointer 10 reciprocates as shown in FIG. 8, and the proximity switch 15 outputs a signal in response to this.

It should be noted that the present invention is not limited only to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] The present invention does not use expensive components such as pneumatics, hydraulics, or optical fiber sets, but instead uses an inexpensive steel pointer and proximity switch, resulting in an inexpensive pump stroke. You can get a counter.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a partial perspective view of the pointer. , FIG. 4 is a perspective view of the proximity switch, FIG. 5 is an electrical system diagram, FIG. 6 is a front view showing main parts of another embodiment of the present invention, and FIG. 7 is a direction shown in FIG. 8 is an explanatory diagram of the operation of the pointer in FIG. 6. 5 is a piston rod, 8 is a column, 10 is a pointer, 15 is a proximity switch, and 24 is a pump support portion. Patent application Japan Shipbuilding Research Association Patent application Hitoshi Kawasaki Heavy Industries, Ltd. Patent application Hitoshi Kawasaki Heavy Industries, Ltd. Patent application Hitachi Nippon Steel Tube Co., Ltd. Patent application Hitoshi Mitsui Engineering & Shipbuilding Co., Ltd. Patent application Applicant: Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] 1) A steel pointer is provided so as to be displaced together with the piston rod of the pump, a proximity switch for detecting passage of the pointer is attached to the fixed side of the pump, and a signal of movement of the pointer detected by the proximity switch is transmitted. A pump stroke counter characterized by being equipped with a remote display panel that can perform processing and display it on a count display section.